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IMX6ULL嵌入式Linux驱动学习笔记（九）.html
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q-show="isShow"></div></nav><div id="wrapper" class="body-wrap"><div class="menu-l"><div class="canvas-wrap"><canvas data-colors="#eaeaea" data-sectionheight="100" data-contentid="js-content" id="myCanvas1" class="anm-canvas"></canvas></div><div id="js-content" class="content-ll"><article id="post-IMX6ULL嵌入式Linux驱动学习笔记（九）" class="article article-type-post" itemscope itemprop="blogPost"><div class="article-inner"><header class="article-header"><h1 class="article-title" itemprop="name">IMX6ULL嵌入式Linux驱动学习笔记（九）</h1><span id="busuanzi_container_page_pv" style="display:none" class="archive-article-date"><i class="icon-smile icon"></i> 阅读数：<span id="busuanzi_value_page_pv"></span>次 </span><a href="/IMX6ULL%E5%B5%8C%E5%85%A5%E5%BC%8FLinux%E9%A9%B1%E5%8A%A8%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0%EF%BC%88%E4%B9%9D%EF%BC%89.html" class="archive-article-date"><time datetime="2021-01-08T03:19:03.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2021-01-08</time></a><div style="margin-top:10px"><span class="post-time"><span class="post-meta-item-icon"><i class="icon-statistics"></i> <span class="post-meta-item-text">字数统计:</span> <span class="post-count">6.5k字</span> </span></span><span class="post-time"> | <span class="post-meta-item-icon"><i class="icon-book icon"></i> <span class="post-meta-item-text">阅读时长≈</span> <span class="post-count">30分</span></span></span></div></header><div class="article-entry" itemprop="articleBody"><p><strong>IMX6ULL嵌入式Linux驱动开发学习</strong></p><p>以下内容是我在学习正点原子<code>IMX6ULL</code>开发板<code>alpha</code>中记录的笔记，部分摘录自正点原子<code>IMX6ULL开发手册</code>。</p><h2 id="一、Linux内核中断处理"><a href="#一、Linux内核中断处理" class="headerlink" title="一、Linux内核中断处理"></a>一、Linux内核中断处理</h2><h3 id="1-1-裸机中断"><a href="#1-1-裸机中断" class="headerlink" title="1.1 裸机中断"></a>1.1 裸机中断</h3><ul><li>使能中断，初始化相应的寄存器。</li><li>注册中断服务函数，也就是向<code>irqTable</code>数组（裸机例程）的指定标号处写入中断服务函数。</li><li>中断发生后进入<code>IRQ</code>中断服务函数，在<code>IRQ</code>中断服务函数中，根据中断号在<code>irqTable</code>里面查找具体的中断处理函数，找到以后执行相应的中断处理函数。</li></ul><a id="more"></a><h3 id="1-2-Linux中断"><a href="#1-2-Linux中断" class="headerlink" title="1.2 Linux中断"></a>1.2 Linux中断</h3><ul><li><p>先知道要使用的中断对应的中断号。</p></li><li><p>根据终端号申请<code>request_irq</code>，<code>request_irq</code>函数可能会导致睡眠，此函数同时会激活中断。</p><blockquote><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* @param irq 中断号</span></span><br><span class="line"><span class="comment"> * @param handler 中断服务函数 </span></span><br><span class="line"><span class="comment"> * @param flags 中断标志、中断触发方式</span></span><br><span class="line"><span class="comment"> * @param name 中断名字</span></span><br><span class="line"><span class="comment"> * @param dev 使用共享中断时，唯一用来区分的标志。当多个设备共享一个中断线，共享的所有中断都必须指定此标志。</span></span><br><span class="line"><span class="comment"> * @return 0 中断申请成功，其他负值 中断申请失败，如果返回 -EBUSY 的话表示中断已经被申请了。</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">request_irq</span><span class="params">(<span class="keyword">unsigned</span> <span class="keyword">int</span> irq, <span class="keyword">irq_handler_t</span> handler, </span></span></span><br><span class="line"><span class="function"><span class="params"> <span class="keyword">unsigned</span> <span class="keyword">long</span> flags, <span class="keyword">const</span> <span class="keyword">char</span> *name, <span class="keyword">void</span> *dev)</span></span>;</span><br></pre></td></tr></table></figure></blockquote></li><li><p>不再使用中断时，需要释放中断<code>free_irq</code>。</p><blockquote><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* @param irq 中断号</span></span><br><span class="line"><span class="comment"> * @param dev 如果中断设置为共享(IRQF_SHARED)的话，此参数用来区分具体的中断。</span></span><br><span class="line"><span class="comment"> * 共享中断只有在释放最后中断处理函数的时候才会被禁止掉。</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">free_irq</span><span class="params">(<span class="keyword">unsigned</span> <span class="keyword">int</span> irq, <span class="keyword">void</span> *dev)</span></span>;</span><br></pre></td></tr></table></figure></blockquote></li><li><p>在使用<code>request_irq</code>函数申请中断的时候需要设置中断处理函数，中断处理函数格式如下所示</p><blockquote><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">irqreturn_t</span> (*<span class="keyword">irq_handler_t</span>) (<span class="keyword">int</span>, <span class="keyword">void</span> *)</span><br></pre></td></tr></table></figure><p>第一个参数是要中断处理函数要相应的中断号。第二个参数是一个指向 <code>void</code> 的指针，也就是个通用指针，需要与 <code>request_irq</code> 函数的 <code>dev</code> 参数保持一致。用于区分共享中断的不同设备，<code>dev</code> 也可以指向设备数据结构。中断处理函数的返回值为 <code>irqreturn_t</code> 类型， <code>irqreturn_t</code> 类型定义如下所示：</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">enum</span> irqreturn {</span><br><span class="line"> IRQ_NONE = (<span class="number">0</span> << <span class="number">0</span>),</span><br><span class="line"> IRQ_HANDLED = (<span class="number">1</span> << <span class="number">0</span>),</span><br><span class="line"> IRQ_WAKE_THREAD = (<span class="number">1</span> << <span class="number">1</span>),</span><br><span class="line">};</span><br><span class="line"></span><br><span class="line"><span class="keyword">typedef</span> <span class="keyword">enum</span> irqreturn <span class="keyword">irqreturn_t</span>;</span><br></pre></td></tr></table></figure><p><code>irqreturn_t</code>是个枚举类型，一共有三种返回值。一般中断服务函数返回值使用如下形式：</p><p><code>return IRQ_RETVAL(IRQ_HANDLED)</code></p></blockquote></li><li><p>中断使能和禁止</p><blockquote><p><code>enable_irq</code> 和 <code>disable_irq</code> 用于使能和禁止指定的中断，<code>irq</code> 就是要禁止的中断号。</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">enable_irq</span><span class="params">(<span class="keyword">unsigned</span> <span class="keyword">int</span> irq)</span></span>;</span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">disable_irq</span><span class="params">(<span class="keyword">unsigned</span> <span class="keyword">int</span> irq)</span></span>;</span><br></pre></td></tr></table></figure><p><code>disable_irq</code>函数要等到当前正在执行的中断处理函数执行完才返回，因此需要保证不会产生新的中断，并且确保所有已经开始执行的中断处理程序已经全部退出。在这种情况下，可以使用另外一个中断禁止函数：</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">disable_irq_nosync</span><span class="params">(<span class="keyword">unsigned</span> <span class="keyword">int</span> irq)</span></span></span><br></pre></td></tr></table></figure><p><code>disable_irq_nosync</code> 函数调用以后立即返回，不会等待当前中断处理程序执行完毕。</p><hr><p>上面三个函数都是使能或者禁止某一个中断，有时候我们需要关闭当前处理器的整个中断系统，也就是在学习 <code>STM32</code> 的时候常说的关闭全局中断，这个时候可以使用如下两个函数：</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">local_irq_enable();</span><br><span class="line">local_irq_disable();</span><br></pre></td></tr></table></figure><p><code>local_irq_enable</code> 用于使能当前处理器中断系统，<code>local_irq_disable</code>用于禁止当前处理器中断系统。</p><hr><p>但是在任务中使用这两个函数会出现问题。比如假如 <code>A</code> 任务调用 <code>local_irq_disable</code> 关闭全局中断10秒，当关闭了2秒的时候 <code>B</code> 任务开始运行， <code>B</code> 任务也调用 <code>local_irq_disable</code> 关闭全局中断3秒， 3秒以后 <code>B</code> 任务调用 <code>local_irq_enable</code> 函数将全局中断打开了。此时才过去 2+3=5 秒的时间，然后全局中断就被打开了，此时 <code>A</code> 任务要关闭10秒全局中断的愿望就破灭了，然后 <code>A</code> 任务就“生气了”，结果很严重，可能系统都要被<code>A</code>任务整崩溃。为了解决这个问题， <code>B</code> 任务不能直接简单粗暴的通过<code>local_irq_enable</code> 函数来打开全局中断，而是将中断状态恢复到以前的状态，要考虑到别的任务的感受，此时就要用到下面两个函数：</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">local_irq_save(flags);</span><br><span class="line">local_irq_restore(flags);</span><br></pre></td></tr></table></figure><p>这两个函数是一对， <code>local_irq_save</code> 函数用于禁止中断，并且将中断状态保存在 <code>flags</code> 中。<br><code>local_irq_restore</code> 用于恢复中断，将中断恢复到 <code>flags</code> 状态。</p></blockquote></li></ul><h3 id="1-3-上半部和下半部"><a href="#1-3-上半部和下半部" class="headerlink" title="1.3 上半部和下半部"></a>1.3 上半部和下半部</h3><ul><li><p>上半部：上半部就是中断处理函数，那些处理过程比较快，不会占用很长时间的处理就可以放在上半部完成。</p></li><li><p>下半部：如果中断处理过程比较耗时，那么就将这些比较耗时的代码提出来，交给下半部去执行，这样中断处理函数就会快进快出。</p></li><li><p>关于代码属于上半部或下半部的参考</p><blockquote><ol><li>如果要处理的内容不希望被其他中断打断，那么可以放到上半部。</li><li>如果要处理的任务对时间敏感，可以放到上半部。</li><li>如果要处理的任务与硬件有关，可以放到上半部。</li><li>除了上述三点以外的其他任务，优先考虑放到下半部。</li></ol></blockquote></li></ul><hr><p><strong><code>Linux</code>对下半部的处理方式。</strong></p><h4 id="1-3-1-软中断"><a href="#1-3-1-软中断" class="headerlink" title="1.3.1 软中断"></a>1.3.1 软中断</h4><p><strong>软中断必须在编译的时候静态注册（写入到内核中）！软中断不要去用。</strong></p><p><code>Linux</code> 内核使用结构体<code>softirq_action</code> 表示软中断，<code>softirq_action</code>结构体定义在文件 <code>include/linux/interrupt.h</code> 中，内容如下：</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">softirq_action</span></span></span><br><span class="line"><span class="class">{</span></span><br><span class="line"> <span class="keyword">void</span> (*action)(struct softirq_action *);</span><br><span class="line">};</span><br></pre></td></tr></table></figure><p>在 <code>kernel/softirq.c</code> 文件中一共定义了 10 个软中断，如下所示：</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">static</span> <span class="class"><span class="keyword">struct</span> <span class="title">softirq_action</span> <span class="title">softirq_vec</span>[<span class="title">NR_SOFTIRQS</span>];</span></span><br></pre></td></tr></table></figure><p><code>NR_SOFTIRQS</code> 是枚举类型，定义在文件 <code>include/linux/interrupt.h</code> 中，定义如下：</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">enum</span> </span><br><span class="line">{</span><br><span class="line"> HI_SOFTIRQ = <span class="number">0</span>, <span class="comment">/* 高优先级软中断 */</span></span><br><span class="line"> TIMER_SOFTIRQ, <span class="comment">/* 定时器软中断 */</span></span><br><span class="line"> NET_TX_SOFTIRQ, <span class="comment">/* 网络数据发送软中断 */</span></span><br><span class="line"> NET_RX_SOFTIRQ, <span class="comment">/* 网络数据接收软中断 */</span></span><br><span class="line"> BLOCK_SOFTIRQ,</span><br><span class="line"> BLOCK_IOPOLL_SOFTIRQ,</span><br><span class="line"> TASKLET_SOFTIRQ, <span class="comment">/* tasklet 软中断 */</span></span><br><span class="line"> SCHED_SOFTIRQ, <span class="comment">/* 调度软中断 */</span></span><br><span class="line"> HRTIMER_SOFTIRQ, <span class="comment">/* 高精度定时器软中断 */</span></span><br><span class="line"> RCU_SOFTIRQ, <span class="comment">/* RCU 软中断 */</span></span><br><span class="line"> NR_SOFTIRQS</span><br><span class="line">};</span><br></pre></td></tr></table></figure><p><code>softirq_action</code> 结构体中的 <code>action</code> 成员变量就是软中断的服务函数，数组 <code>softirq_vec</code> 是个全局数组，因此所有的 <code>CPU</code>(对于 <code>SMP</code> 系统而言)都可以访问到，每个 <code>CPU</code> 都有自己的触发和控制机制，并且只执行自己所触发的软中断。但是各个 <code>CPU</code> 所执行的软中断服务函数确是相同的，都是数组 <code>softirq_vec</code> 中定义的 <code>action</code> 函数。</p><hr><ul><li><p>要使用软中断要先注册。</p><blockquote><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* @brief 注册软中断服务函数</span></span><br><span class="line"><span class="comment"> * @param nr 要开启的软中断 是上面枚举中的一个。</span></span><br><span class="line"><span class="comment"> * @param action 软中断对应的处理函数</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">open_softirq</span><span class="params">(<span class="keyword">int</span> nr, <span class="keyword">void</span> (*action)(struct softirq_action *))</span></span></span><br></pre></td></tr></table></figure><p>软中断必须在编译的时候静态注册！</p></blockquote></li><li><p>触发软中断</p><blockquote><p>注册好软中断以后需要通过 <code>raise_softirq</code> 函数触发， <code>raise_softirq</code> 函数原型如下：</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* @brief 触发软中断</span></span><br><span class="line"><span class="comment"> * @param nr 要触发的软中断</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">raise_softirq</span><span class="params">(<span class="keyword">unsigned</span> <span class="keyword">int</span> nr)</span></span></span><br></pre></td></tr></table></figure></blockquote></li></ul><h4 id="1-3-2-tasklet"><a href="#1-3-2-tasklet" class="headerlink" title="1.3.2 tasklet"></a>1.3.2 tasklet</h4><p><code>tasklet</code> 是利用软中断来实现的另外一种下半部机制，建议使用 <code>tasklet</code>。</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">tasklet_struct</span></span></span><br><span class="line"><span class="class">{</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">tasklet_struct</span> *<span class="title">next</span>;</span> <span class="comment">/* 下一个 tasklet */</span></span><br><span class="line"> <span class="keyword">unsigned</span> <span class="keyword">long</span> state; <span class="comment">/* tasklet 状态 */</span></span><br><span class="line"> <span class="keyword">atomic_t</span> count; <span class="comment">/* 计数器，记录对 tasklet 的引用数 */</span></span><br><span class="line"> <span class="keyword">void</span> (*func)(<span class="keyword">unsigned</span> <span class="keyword">long</span>); <span class="comment">/* tasklet 执行的函数 */</span></span><br><span class="line"> <span class="keyword">unsigned</span> <span class="keyword">long</span> data; <span class="comment">/* 函数 func 的参数 */</span></span><br><span class="line">};</span><br></pre></td></tr></table></figure><p>如果要使用 <code>tasklet</code>，必须先定义一个 <code>tasklet</code>，然后使用 <code>tasklet_init</code> 函数初始化 <code>tasklet</code>，<code>taskled_init</code> 函数原型如下：</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* @brief 初始化 tasklet</span></span><br><span class="line"><span class="comment"> * @param t 要初始化的 tasklet</span></span><br><span class="line"><span class="comment"> * @param func tasklet 的处理函数。</span></span><br><span class="line"><span class="comment"> * @param data 要传递给 func 函数的参数</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">tasklet_init</span><span class="params">(struct tasklet_struct *t, <span class="keyword">void</span> (*func)(<span class="keyword">unsigned</span> <span class="keyword">long</span>), <span class="keyword">unsigned</span> <span class="keyword">long</span> data)</span></span>;</span><br></pre></td></tr></table></figure><p>也 可 以 使 用 宏 <code>DECLARE_TASKLET</code> 来 一 次 性 完 成 <code>tasklet</code> 的 定 义 和 初 始 化 ，<code>DECLARE_TASKLET</code> 定义在 <code>include/linux/interrupt.h</code> 文件中，定义如下：</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* name 为要定义的 tasklet 名字，</span></span><br><span class="line"><span class="comment"> * 这个名字就是一个 tasklet_struct 类型的结构变量，</span></span><br><span class="line"><span class="comment"> * func 就是 tasklet 的处理函数，data 是传递给 func 函数的参数。</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line">DECLARE_TASKLET(name, func, data);</span><br></pre></td></tr></table></figure><p>在上半部，也就是中断处理函数中调用 <code>tasklet_schedule</code> 函数就能使 <code>tasklet</code> 在合适的时间运<br>行， <code>tasklet_schedule</code> 函数原型如下：</p><figure class="highlight"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* @param t 要调度的 tasklet，也就是 DECLARE_TASKLET 宏里面的 name。*/</span></span><br><span class="line">void tasklet_schedule(struct tasklet_struct *t)；</span><br></pre></td></tr></table></figure><hr><p><strong><code>tasklet</code> 使用顺序：</strong></p><ol><li>定义一个<code>tasklet</code>。</li><li>初始化<code>tasklet</code>，重点是设置对应的处理函数。</li><li>在上半部中调用<code>tasklet_schedule</code>函数，使 <code>tasklet</code> 在合适的时间运行。</li></ol><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* 定义 taselet */</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">tasklet_struct</span> <span class="title">testtasklet</span>;</span></span><br><span class="line"></span><br><span class="line"><span class="comment">/* tasklet 处理函数 */</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">testtasklet_func</span><span class="params">(<span class="keyword">unsigned</span> <span class="keyword">long</span> data)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="comment">/* tasklet 具体处理内容 */</span></span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 中断处理函数 */</span></span><br><span class="line"><span class="function"><span class="keyword">irqreturn_t</span> <span class="title">test_handler</span><span class="params">(<span class="keyword">int</span> irq, <span class="keyword">void</span> *dev_id)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> ......</span><br><span class="line"> <span class="comment">/* 调度 tasklet */</span></span><br><span class="line"> tasklet_schedule(&testtasklet);</span><br><span class="line"> ......</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 驱动入口函数 */</span></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">int</span> __init <span class="title">xxxx_init</span><span class="params">(<span class="keyword">void</span>)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> ......</span><br><span class="line"> <span class="comment">/* 初始化 tasklet */</span></span><br><span class="line"> tasklet_init(&testtasklet, testtasklet_func, data);</span><br><span class="line"> <span class="comment">/* 注册中断处理函数 */</span></span><br><span class="line"> request_irq(xxx_irq, test_handler, <span class="number">0</span>, <span class="string">"xxx"</span>, &xxx_dev);</span><br><span class="line"> ......</span><br><span class="line">}</span><br></pre></td></tr></table></figure><h4 id="1-3-3-工作队列"><a href="#1-3-3-工作队列" class="headerlink" title="1.3.3 工作队列"></a>1.3.3 工作队列</h4><p>工作队列是另外一种下半部执行方式，工作队列在进程上下文执行，工作队列将要推后的工作交给一个内核线程去执行，因为工作队列工作在进程上下文，因此工作队列允许睡眠或重新调度。因此如果要推后的工作可以睡眠那么就可以选择工作队列，否则的话就只能选择软中断或 <code>tasklet</code>。</p><p><code>Linux</code> 内核使用 <code>work_struct</code> 结构体表示一个工作，内容如下(省略掉条件编译)：</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">work_struct</span> {</span></span><br><span class="line"> <span class="keyword">atomic_long_t</span> data;</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">list_head</span> <span class="title">entry</span>;</span></span><br><span class="line"> <span class="keyword">work_func_t</span> func; <span class="comment">/* 工作队列处理函数 */</span></span><br><span class="line">};</span><br></pre></td></tr></table></figure><p>这些工作组织成工作队列，工作队列使用 <code>workqueue_struct</code> 结构体表示，内容如下(省略掉条件编译)：</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">workqueue_struct</span> {</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">list_head</span> <span class="title">pwqs</span>;</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">list_head</span> <span class="title">list</span>;</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">mutex</span> <span class="title">mutex</span>;</span></span><br><span class="line"> <span class="keyword">int</span> work_color;</span><br><span class="line"> <span class="keyword">int</span> flush_color;</span><br><span class="line"> <span class="keyword">atomic_t</span> nr_pwqs_to_flush;</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">wq_flusher</span> *<span class="title">first_flusher</span>;</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">list_head</span> <span class="title">flusher_queue</span>;</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">list_head</span> <span class="title">flusher_overflow</span>;</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">list_head</span> <span class="title">maydays</span>;</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">worker</span> *<span class="title">rescuer</span>;</span></span><br><span class="line"> <span class="keyword">int</span> nr_drainers;</span><br><span class="line"> <span class="keyword">int</span> saved_max_active;</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">workqueue_attrs</span> *<span class="title">unbound_attrs</span>;</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">pool_workqueue</span> *<span class="title">dfl_pwq</span>;</span></span><br><span class="line"> <span class="keyword">char</span> name[WQ_NAME_LEN];</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">rcu_head</span> <span class="title">rcu</span>;</span></span><br><span class="line"> <span class="keyword">unsigned</span> <span class="keyword">int</span> flags ____cacheline_aligned;</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">pool_workqueue</span> __<span class="title">percpu</span> *<span class="title">cpu_pwqs</span>;</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">pool_workqueue</span> __<span class="title">rcu</span> *<span class="title">numa_pwq_tbl</span>[];</span></span><br><span class="line">};</span><br></pre></td></tr></table></figure><p><code>Linux</code> 内核使用工作者线程<code>(worker thread)</code>来处理工作队列中的各个工作， <code>Linux</code> 内核使用<code>worker</code> 结构体表示工作者线程， <code>worker</code> 结构体内容如下：</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">worker</span> {</span></span><br><span class="line"> <span class="keyword">union</span> {</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">list_head</span> <span class="title">entry</span>;</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">hlist_node</span> <span class="title">hentry</span>;</span></span><br><span class="line"> };</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">work_struct</span> *<span class="title">current_work</span>;</span></span><br><span class="line"> <span class="keyword">work_func_t</span> current_func;</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">pool_workqueue</span> *<span class="title">current_pwq</span>;</span></span><br><span class="line"> <span class="keyword">bool</span> desc_valid;</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">list_head</span> <span class="title">scheduled</span>;</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">task_struct</span> *<span class="title">task</span>;</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">worker_pool</span> *<span class="title">pool</span>;</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">list_head</span> <span class="title">node</span>;</span></span><br><span class="line"> <span class="keyword">unsigned</span> <span class="keyword">long</span> last_active;</span><br><span class="line"> <span class="keyword">unsigned</span> <span class="keyword">int</span> flags;</span><br><span class="line"> <span class="keyword">int</span> id;</span><br><span class="line"> <span class="keyword">char</span> desc[WORKER_DESC_LEN];</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">workqueue_struct</span> *<span class="title">rescue_wq</span>;</span></span><br><span class="line">};</span><br></pre></td></tr></table></figure><p>每个 <code>worker</code> 都有一个工作队列，工作者线程处理自己工作队列中的所有工作。在实际的驱动开发中，只需要定义工作<code>(work_struct)</code>即可，关于工作队列和工作者线程基本不用去管。</p><ul><li><p>创建工作直接定一个<code>work_struct</code>结构体，然后使用<code>INIT_WORK</code>宏来初始化工作即可，<code>INIT_WORK</code>宏定义如下：</p><blockquote><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* _work 表示要初始化的工作， _func 是工作对应的处理函数。*/</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> INIT_WORK(_work, _func)</span></span><br></pre></td></tr></table></figure><p>也可以使用<code>DECLARE_WORK</code>宏一次性完成工作的创建和初始化，宏定义如下：</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* n 表示定义的工作(work_struct)， f 表示工作对应的处理函数。*/</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> DECLARE_WORK(n, f)</span></span><br></pre></td></tr></table></figure></blockquote></li><li><p>同<code>tasklet</code>一样，工作也是需要调度才能运行的，工作的调度函数为 <code>schedule_work</code>，函数原型如下所示：</p><blockquote><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* @brief 调度工作</span></span><br><span class="line"><span class="comment">* @param work 要调度的工作</span></span><br><span class="line"><span class="comment">* @return 结果 0 成功，其他值 失败</span></span><br><span class="line"><span class="comment">*/</span></span><br><span class="line"><span class="function"><span class="keyword">bool</span> <span class="title">schedule_work</span><span class="params">(struct work_struct *work)</span></span></span><br></pre></td></tr></table></figure></blockquote></li></ul><hr><p><strong>工作队列使用顺序：</strong></p><ol><li>定义一个<code>work</code>。</li><li>初始化<code>work</code>，重点同样是是设置对应的处理函数。</li><li>在上半部中调用<code>schedule_work</code>函数，使 <code>work</code> 在合适的时间运行。</li></ol><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* 定义工作(work) */</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">work_struct</span> <span class="title">testwork</span>;</span></span><br><span class="line"></span><br><span class="line"><span class="comment">/* work 处理函数 */</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">testwork_func_t</span><span class="params">(struct work_struct *work)</span></span>;</span><br><span class="line">{</span><br><span class="line"> <span class="comment">/* 根据成员变量反推出结构体的首地址 */</span></span><br><span class="line"> <span class="comment">//struct demo_struct *p = container_of(work, struct demo_struct, 成员变量名);</span></span><br><span class="line"> <span class="comment">/* work 具体处理内容 */</span></span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 中断处理函数 */</span></span><br><span class="line"><span class="function"><span class="keyword">irqreturn_t</span> <span class="title">test_handler</span><span class="params">(<span class="keyword">int</span> irq, <span class="keyword">void</span> *dev_id)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> ......</span><br><span class="line"> <span class="comment">/* 调度 work */</span></span><br><span class="line"> schedule_work(&testwork);</span><br><span class="line"> ......</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 驱动入口函数 */</span></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">int</span> __init <span class="title">xxxx_init</span><span class="params">(<span class="keyword">void</span>)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> ......</span><br><span class="line"> <span class="comment">/* 初始化 work */</span></span><br><span class="line"> INIT_WORK(&testwork, <span class="keyword">testwork_func_t</span>);</span><br><span class="line"> <span class="comment">/* 注册中断处理函数 */</span></span><br><span class="line"> request_irq(xxx_irq, test_handler, <span class="number">0</span>, <span class="string">"xxx"</span>, &xxx_dev);</span><br><span class="line"> ......</span><br><span class="line">}</span><br></pre></td></tr></table></figure><h3 id="1-4-设备树中断节点信息"><a href="#1-4-设备树中断节点信息" class="headerlink" title="1.4 设备树中断节点信息"></a>1.4 设备树中断节点信息</h3><p><code>#interrupt-cells</code>指定中断域编码中断说明符所需的单元数。对于设备来说，会使用<code>interrupts</code>属性来描述中断信息，而<code>#interrupt-cells</code>则指定了描述一个中断信息需要几个数值。</p><blockquote><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line">intc: interrupt-controller@<span class="number">00</span>a01000 {</span><br><span class="line"> compatible = <span class="string">"arm,cortex-a7-gic"</span>;</span><br><span class="line"> <span class="meta">#interrupt-cells = <span class="meta-string"><3>;</span></span></span><br><span class="line"> interrupt-controller;</span><br><span class="line"> reg = <<span class="number">0x00a01000</span> <span class="number">0x1000</span>>,</span><br><span class="line"> <<span class="number">0x00a02000</span> <span class="number">0x100</span>>;</span><br><span class="line">};</span><br><span class="line"></span><br><span class="line">gpio5: gpio@<span class="number">020</span>ac000 {</span><br><span class="line"> compatible = <span class="string">"fsl,imx6ul-gpio"</span>, <span class="string">"fsl,imx35-gpio"</span>;</span><br><span class="line"> reg = <<span class="number">0x020ac000</span> <span class="number">0x4000</span>>;</span><br><span class="line"> <span class="built_in">interrupts</span> = <GIC_SPI <span class="number">74</span> IRQ_TYPE_LEVEL_HIGH>,</span><br><span class="line"> <GIC_SPI <span class="number">75</span> IRQ_TYPE_LEVEL_HIGH>;</span><br><span class="line"> gpio-controller;</span><br><span class="line"> <span class="meta">#gpio-cells = <span class="meta-string"><2>;</span></span></span><br><span class="line"> interrupt-controller; <span class="comment">// 表示当前节点是中断控制器</span></span><br><span class="line"> <span class="meta">#interrupt-cells = <span class="meta-string"><2>;</span></span></span><br><span class="line">};</span><br></pre></td></tr></table></figure><p>从<code>gpio5</code>的<code>interrupts</code>属性可以看到描述一个中断信息需要三个<code>cell</code>，分别是</p><ul><li>第一个 <code>cell</code>：中断类型， <code>0</code> 表示 <code>SPI</code> 中断（共享中断，不是 <code>SPI</code>通讯的中断）， <code>1</code> 表示 <code>PPI</code> 中断。</li><li>第二个 <code>cell</code>：中断号，对于 <code>SPI</code> 中断来说中断号的范围为 <code>0~987</code>，对于 <code>PPI</code> 中断来说中断号的范围为 <code>0~15</code>。</li><li>第三个 <code>cell</code>：标志， <code>bit[3:0]</code>表示中断触发类型，为 <code>1</code> 的时候表示上升沿触发，为 <code>2</code> 的时候表示下降沿触发，为 <code>4</code> 的时候表示高电平触发，为 <code>8</code> 的时候表示低电平触发。<code>bit[15:8]</code>为 <code>PPI</code> 中断的 <code>CPU 掩码</code>。</li></ul></blockquote><hr><p>在NXP的官方<code>6ull</code>开发板上有一个磁力计芯片<code>fxls8471</code>，<code>fxls8471</code>的中断引脚链接到<code>I.MX6ULL</code>的<code>SNVS_TAMPER0</code>引脚上，而这个引脚可以复用为<code>GPIO_IO0</code>。在设备树中<code>fxls8471</code>的描述如下：</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">fxls8471@<span class="number">1</span>e {</span><br><span class="line"> compatible = <span class="string">"fsl,fxls8471"</span>;</span><br><span class="line"> reg = <<span class="number">0x1e</span>>;</span><br><span class="line"> <span class="built_in">position</span> = <<span class="number">0</span>>;</span><br><span class="line"> interrupt-parent = <&gpio5>;</span><br><span class="line"> <span class="built_in">interrupts</span> = <<span class="number">0</span> <span class="number">8</span>>;</span><br><span class="line">};</span><br></pre></td></tr></table></figure><ul><li><code>interrupt-parent</code> 属性设置中断控制器，这里使用 <code>gpio5</code> 作为中断控制器。</li><li><code>interrupts</code> 属性设置中断信息，因为在上面 <code>gpio5</code> 的节点中将 <code>#interrupt-cells</code> 设置为了<code>2</code>，所以这里的 <code>interrupts</code> 属性，需要使用两个 <code>cell</code> 来描述中断信息。</li></ul><hr><p>从设备树中获取中断号</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* @brief 获取中断号</span></span><br><span class="line"><span class="comment"> * @param dev 设备节点</span></span><br><span class="line"><span class="comment"> * @param index 索引号</span></span><br><span class="line"><span class="comment"> * @return 中断号</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="function"><span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="title">irq_of_parse_and_map</span><span class="params">(struct device_node *dev, <span class="keyword">int</span> index)</span></span></span><br></pre></td></tr></table></figure><p>如果使用 <code>GPIO</code> 的话，可以使用 <code>gpio_to_irq</code> 函数来获取 <code>gpio</code> 对应的中断号，函数原型如下：</p><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* @brief 获取gpio对应的中断号</span></span><br><span class="line"><span class="comment"> * @param gpio 要获取的GPIO编号</span></span><br><span class="line"><span class="comment"> * @return GPIO对应的中断号</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">gpio_to_irq</span><span class="params">(<span class="keyword">unsigned</span> <span class="keyword">int</span> gpio)</span></span></span><br></pre></td></tr></table></figure><h2 id="二、编写按键中断实验驱动"><a href="#二、编写按键中断实验驱动" class="headerlink" title="二、编写按键中断实验驱动"></a>二、编写按键中断实验驱动</h2><h3 id="2-1-配置设备树"><a href="#2-1-配置设备树" class="headerlink" title="2.1 配置设备树"></a>2.1 配置设备树</h3><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br></pre></td><td class="code"><pre><span class="line">/dts-v1/;</span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><dt-bindings/input/input.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">"imx6ull.dtsi"</span></span></span><br><span class="line"></span><br><span class="line">/ {</span><br><span class="line"> model = <span class="string">"Freescale i.MX6 ULL 14x14 EVK Board"</span>;</span><br><span class="line"> compatible = <span class="string">"fsl,imx6ull-14x14-evk"</span>, <span class="string">"fsl,imx6ull"</span>;</span><br><span class="line"></span><br><span class="line"> ……</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 自己添加的节点 2020-9-17 */</span></span><br><span class="line"></span><br><span class="line"> ……</span><br><span class="line"></span><br><span class="line"> key {</span><br><span class="line"> compatible = <span class="string">"atkalpha,key"</span>;</span><br><span class="line"> pinctrl-names = <span class="string">"default"</span>;</span><br><span class="line"> pinctrl<span class="number">-0</span> = <&pinctrl_key>;</span><br><span class="line"> key-gpios = <&gpio1 <span class="number">18</span> GPIO_ACTIVE_HIGH>;</span><br><span class="line"> status = <span class="string">"okay"</span>;</span><br><span class="line"> interrupt-parent = <&gpio1>;</span><br><span class="line"> <span class="built_in">interrupts</span> = <<span class="number">18</span> IRQ_TYPE_EDGE_BOTH>;</span><br><span class="line"> };</span><br><span class="line">};</span><br><span class="line"></span><br><span class="line">……</span><br><span class="line"></span><br><span class="line">&iomuxc {</span><br><span class="line"> pinctrl-names = <span class="string">"default"</span>;</span><br><span class="line"> pinctrl<span class="number">-0</span> = <&pinctrl_hog_1>;</span><br><span class="line"> imx6ul-evk {</span><br><span class="line"> pinctrl_hog_1: hoggrp<span class="number">-1</span> {</span><br><span class="line"> fsl,pins = <</span><br><span class="line"> MX6UL_PAD_UART1_RTS_B__GPIO1_IO19 <span class="number">0x17059</span> <span class="comment">/* SD1 CD */</span></span><br><span class="line"> MX6UL_PAD_GPIO1_IO05__USDHC1_VSELECT <span class="number">0x17059</span> <span class="comment">/* SD1 VSELECT */</span></span><br><span class="line"> MX6UL_PAD_GPIO1_IO09__GPIO1_IO09 <span class="number">0x17059</span> <span class="comment">/* SD1 RESET */</span></span><br><span class="line"> >;</span><br><span class="line"> };</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 自己定义的IO复用 START */</span></span><br><span class="line"></span><br><span class="line"> ……</span><br><span class="line"></span><br><span class="line"> pinctrl_key: keygrp {</span><br><span class="line"> fsl,pins = <</span><br><span class="line"> MX6UL_PAD_UART1_CTS_B__GPIO1_IO18 <span class="number">0XF080</span></span><br><span class="line"> >;</span><br><span class="line"> };</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 自己定义的IO复用 END */</span></span><br><span class="line"></span><br><span class="line"> ……</span><br><span class="line"> };</span><br><span class="line">};</span><br><span class="line"></span><br><span class="line">……</span><br></pre></td></tr></table></figure><h3 id="2-2-按键中断驱动程序"><a href="#2-2-按键中断驱动程序" class="headerlink" title="2.2 按键中断驱动程序"></a>2.2 按键中断驱动程序</h3><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span 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class="line">237</span><br><span class="line">238</span><br><span class="line">239</span><br><span class="line">240</span><br><span class="line">241</span><br><span class="line">242</span><br><span class="line">243</span><br><span class="line">244</span><br><span class="line">245</span><br><span class="line">246</span><br><span class="line">247</span><br><span class="line">248</span><br><span class="line">249</span><br><span class="line">250</span><br><span class="line">251</span><br><span class="line">252</span><br><span class="line">253</span><br><span class="line">254</span><br><span class="line">255</span><br><span class="line">256</span><br><span class="line">257</span><br><span class="line">258</span><br><span class="line">259</span><br><span class="line">260</span><br><span class="line">261</span><br><span class="line">262</span><br><span class="line">263</span><br><span class="line">264</span><br><span class="line">265</span><br><span class="line">266</span><br><span 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class="line">297</span><br><span class="line">298</span><br><span class="line">299</span><br><span class="line">300</span><br><span class="line">301</span><br><span class="line">302</span><br><span class="line">303</span><br><span class="line">304</span><br><span class="line">305</span><br><span class="line">306</span><br><span class="line">307</span><br><span class="line">308</span><br><span class="line">309</span><br><span class="line">310</span><br><span class="line">311</span><br><span class="line">312</span><br><span class="line">313</span><br><span class="line">314</span><br><span class="line">315</span><br><span class="line">316</span><br><span class="line">317</span><br><span class="line">318</span><br><span class="line">319</span><br><span class="line">320</span><br><span class="line">321</span><br><span class="line">322</span><br><span class="line">323</span><br><span class="line">324</span><br><span class="line">325</span><br><span class="line">326</span><br><span class="line">327</span><br><span class="line">328</span><br><span class="line">329</span><br><span class="line">330</span><br><span class="line">331</span><br><span class="line">332</span><br><span class="line">333</span><br><span class="line">334</span><br><span class="line">335</span><br><span class="line">336</span><br><span class="line">337</span><br><span class="line">338</span><br><span class="line">339</span><br><span class="line">340</span><br><span class="line">341</span><br><span class="line">342</span><br><span class="line">343</span><br><span class="line">344</span><br><span class="line">345</span><br><span class="line">346</span><br><span class="line">347</span><br><span class="line">348</span><br><span class="line">349</span><br><span class="line">350</span><br><span class="line">351</span><br><span class="line">352</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/types.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/kernel.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/delay.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/init.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/ide.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/module.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/errno.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/gpio.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/cdev.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/of.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/of_address.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/of_irq.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/of_gpio.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/timer.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/jiffies.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/string.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/irq.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/interrupt.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><asm/mach/map.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><asm/uaccess.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><asm/io.h></span></span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> KEYIRQ_CNT 1</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> KEYIRQ_NAME <span class="meta-string">"keyirq"</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> KEY_NUM 1</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> KEY0_VALUE 0X01</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> INVAKEY 0XFF <span class="comment">/* 无效按键值 */</span></span></span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">key_dev</span></span></span><br><span class="line"><span class="class">{</span></span><br><span class="line"> <span class="keyword">int</span> gpio; <span class="comment">/* IO编号 */</span></span><br><span class="line"> <span class="keyword">int</span> irqNum; <span class="comment">/* 中断号 */</span></span><br><span class="line"> <span class="keyword">unsigned</span> <span class="keyword">char</span> value; <span class="comment">/* 按键值 */</span></span><br><span class="line"> <span class="keyword">char</span> name[<span class="number">10</span>]; <span class="comment">/* 名称 */</span></span><br><span class="line"> <span class="keyword">irqreturn_t</span> (*handler)(<span class="keyword">int</span>, <span class="keyword">void</span>*); <span class="comment">/* 中断处理函数 */</span></span><br><span class="line">};</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/* 定义设备驱动结构体 */</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">keyirq_dev</span></span></span><br><span class="line"><span class="class">{</span></span><br><span class="line"> <span class="keyword">dev_t</span> devid; <span class="comment">/* 设备ID */</span></span><br><span class="line"> <span class="keyword">int</span> major; <span class="comment">/* 主设备号 */</span></span><br><span class="line"> <span class="keyword">int</span> minor; <span class="comment">/* 次设备号 */</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">cdev</span> <span class="title">cdev</span>;</span> <span class="comment">/* 字符设备结构体 */</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">class</span> *<span class="title">class</span>;</span> <span class="comment">/* 设备类 */</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">device</span> *<span class="title">device</span>;</span> <span class="comment">/* 设备节点 */</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">device_node</span> *<span class="title">nd</span>;</span> <span class="comment">/* 设备树节点 */</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">key_dev</span> <span class="title">key</span>[<span class="title">KEY_NUM</span>];</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">timer_list</span> <span class="title">timer</span>;</span> <span class="comment">/* 定时器 */</span></span><br><span class="line"></span><br><span class="line"> <span class="keyword">atomic_t</span> keyValue; <span class="comment">/* 按键值 */</span></span><br><span class="line"> <span class="keyword">atomic_t</span> keyRelease; <span class="comment">/* 按键是否释放 */</span></span><br><span class="line"> </span><br><span class="line">};</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">keyirq_dev</span> <span class="title">keyirq</span>;</span> <span class="comment">/* 定义一个keyirq设备 */</span></span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">int</span> <span class="title">keyirq_open</span><span class="params">(struct inode *inode, struct file *filp)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> filp->private_data = &keyirq;</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">} </span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">int</span> <span class="title">keyirq_release</span><span class="params">(struct inode *inode, struct file *filp)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">keyirq_dev</span> *<span class="title">dev</span> = <span class="title">filp</span>-><span class="title">private_data</span>;</span></span><br><span class="line"> </span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">ssize_t</span> <span class="title">keyirq_write</span><span class="params">(struct file *filp, <span class="keyword">const</span> <span class="keyword">char</span> __user *buf, <span class="keyword">size_t</span> count, <span class="keyword">loff_t</span> *ppos)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">keyirq_dev</span> *<span class="title">dev</span> = <span class="title">filp</span>-><span class="title">private_data</span>;</span></span><br><span class="line"> </span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">ssize_t</span> <span class="title">keyirq_read</span><span class="params">(struct file *filp, <span class="keyword">char</span> __user *buf, <span class="keyword">size_t</span> count, <span class="keyword">loff_t</span> *ppos)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">keyirq_dev</span> *<span class="title">dev</span> = <span class="title">filp</span>-><span class="title">private_data</span>;</span></span><br><span class="line"> <span class="keyword">int</span> ret = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">unsigned</span> <span class="keyword">char</span> keyValue;</span><br><span class="line"> <span class="keyword">unsigned</span> <span class="keyword">char</span> keyRelease;</span><br><span class="line"></span><br><span class="line"> keyValue = atomic_read(&dev->keyValue);</span><br><span class="line"> keyRelease = atomic_read(&dev->keyRelease);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (keyRelease)</span><br><span class="line"> {</span><br><span class="line"> <span class="comment">/* 一次有效按键 */</span></span><br><span class="line"> <span class="keyword">if</span> (keyValue & <span class="number">0X80</span>)</span><br><span class="line"> {</span><br><span class="line"> keyValue &= ~<span class="number">0X80</span>; <span class="comment">// 去除标记</span></span><br><span class="line"> ret = copy_to_user(buf, &keyValue, <span class="keyword">sizeof</span>(keyValue));</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">goto</span> data_err;</span><br><span class="line"> }</span><br><span class="line"> atomic_set(&dev->keyRelease, <span class="number">0</span>);</span><br><span class="line"> } </span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">goto</span> data_err;</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> ret;</span><br><span class="line">data_err:</span><br><span class="line"> <span class="keyword">return</span> -EINVAL;</span><br><span class="line"></span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 操作集 */</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">file_operations</span> <span class="title">keyirq_fops</span> = {</span></span><br><span class="line"> .owner = THIS_MODULE,</span><br><span class="line"> .<span class="built_in">open</span> = keyirq_open,</span><br><span class="line"> .<span class="built_in">release</span> = keyirq_release,</span><br><span class="line"> .<span class="built_in">write</span> = keyirq_write,</span><br><span class="line"> .<span class="built_in">read</span> = keyirq_read,</span><br><span class="line">};</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * @brief 定时器处理函数</span></span><br><span class="line"><span class="comment"> * @param arg 用户参数</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">void</span> <span class="title">timer_func</span><span class="params">(<span class="keyword">unsigned</span> <span class="keyword">long</span> arg)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">keyirq_dev</span> *<span class="title">dev</span> = (<span class="title">struct</span> <span class="title">keyirq_dev</span>*)<span class="title">arg</span>;</span></span><br><span class="line"> <span class="keyword">int</span> value = <span class="number">0</span>;</span><br><span class="line"></span><br><span class="line"> value = gpio_get_value(dev->key[<span class="number">0</span>].gpio);</span><br><span class="line"> <span class="keyword">if</span> (value == <span class="number">0</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="comment">// 按键按下</span></span><br><span class="line"> printk(<span class="string">"KEY0 Press!\r\n"</span>);</span><br><span class="line"> atomic_set(&dev->keyValue, dev->key[<span class="number">0</span>].value);</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span> <span class="keyword">if</span>(value == <span class="number">1</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="comment">// 按键释放</span></span><br><span class="line"> printk(<span class="string">"KEY0 Release!\r\n"</span>);</span><br><span class="line"> atomic_set(&dev->keyValue, dev->key[<span class="number">0</span>].value | <span class="number">0X80</span>); <span class="comment">// 打上标签，标记按键按下</span></span><br><span class="line"> atomic_set(&dev->keyRelease, <span class="number">1</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * @brief 按键中断处理函数</span></span><br><span class="line"><span class="comment"> * @param irq 中断号</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">irqreturn_t</span> <span class="title">key0_handler</span><span class="params">(<span class="keyword">int</span> irq, <span class="keyword">void</span> *arg)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">keyirq_dev</span> *<span class="title">dev</span> = <span class="title">arg</span>;</span></span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 启动定时器来延时消抖 */</span></span><br><span class="line"> dev->timer.data = (<span class="keyword">volatile</span> <span class="keyword">unsigned</span> <span class="keyword">long</span>)arg;</span><br><span class="line"> mod_timer(&dev->timer, jiffies + msecs_to_jiffies(<span class="number">20</span>));</span><br><span class="line"> <span class="keyword">return</span> IRQ_HANDLED;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * @brief 按键初始化</span></span><br><span class="line"><span class="comment"> * @param dev 设备结构体</span></span><br><span class="line"><span class="comment"> * @return 错误类型</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">int</span> <span class="title">keyio_init</span><span class="params">(struct keyirq_dev *dev)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">int</span> ret = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">int</span> i = <span class="number">0</span>;</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 按键初始化 */</span></span><br><span class="line"> dev->nd = of_find_node_by_path(<span class="string">"/key"</span>);</span><br><span class="line"> <span class="keyword">if</span> (dev->nd == <span class="literal">NULL</span>)</span><br><span class="line"> {</span><br><span class="line"> ret = -EINVAL;</span><br><span class="line"> <span class="keyword">goto</span> fail_nd;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 可能有多个按键，因此需要根据实际数量来读取 */</span></span><br><span class="line"> <span class="keyword">for</span> (i = <span class="number">0</span>; i < KEY_NUM; i++)</span><br><span class="line"> {</span><br><span class="line"> dev->key[i].gpio = of_get_named_gpio(dev->nd, <span class="string">"key-gpios"</span>, i);</span><br><span class="line"> <span class="keyword">if</span> (dev->key[i].gpio < <span class="number">0</span> )</span><br><span class="line"> {</span><br><span class="line"> ret = -EINVAL;</span><br><span class="line"> <span class="keyword">goto</span> fail_getGpio;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">for</span> (i = <span class="number">0</span>; i < KEY_NUM; i++)</span><br><span class="line"> {</span><br><span class="line"> <span class="built_in">memset</span>(dev->key[i].name, <span class="number">0</span>, <span class="keyword">sizeof</span>(dev->key[i].name));</span><br><span class="line"> <span class="built_in">sprintf</span>(dev->key[i].name, <span class="string">"KEY%d"</span>, i);</span><br><span class="line"> ret = gpio_request(dev->key[i].gpio, dev->key[i].name);</span><br><span class="line"> <span class="keyword">if</span> (ret < <span class="number">0</span> )</span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">goto</span> fail_requestGpio;</span><br><span class="line"> }</span><br><span class="line"> ret = gpio_direction_input(dev->key[i].gpio);</span><br><span class="line"> <span class="keyword">if</span> (ret < <span class="number">0</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">goto</span> fail_setGpioDir;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 获取中断号 */</span></span><br><span class="line"> dev->key[i].irqNum = gpio_to_irq(dev->key[i].gpio);</span><br><span class="line"> <span class="comment">// dev->key[i].irqNum = irq_of_parse_and_map(dev->nd, i);</span></span><br><span class="line"></span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> <span class="comment">/* 按键中断初始化 */</span></span><br><span class="line"> dev->key[<span class="number">0</span>].handler = key0_handler;</span><br><span class="line"> dev->key[<span class="number">0</span>].value = KEY0_VALUE;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">for</span> (i = <span class="number">0</span>; i < KEY_NUM; i++)</span><br><span class="line"> {</span><br><span class="line"> <span class="comment">/* 跳变沿触发方式 */</span></span><br><span class="line"> ret = request_irq(dev->key[i].irqNum, dev->key[i].handler, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, dev->key[i].name, dev);</span><br><span class="line"> <span class="keyword">if</span> (ret < <span class="number">0</span>)</span><br><span class="line"> {</span><br><span class="line"> printk(<span class="string">"irq %d request failed!\r\n"</span>, dev->key[i].irqNum);</span><br><span class="line"> <span class="keyword">goto</span> fail_irq;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 初始化定时器 */</span></span><br><span class="line"> init_timer(&dev->timer);</span><br><span class="line"> dev->timer.function = timer_func;</span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line"></span><br><span class="line">fail_irq:</span><br><span class="line">fail_setGpioDir:</span><br><span class="line"> <span class="keyword">for</span> (i = i<span class="number">-1</span>; i >= <span class="number">0</span>; i--)</span><br><span class="line"> {</span><br><span class="line"> gpio_free(dev->key[i].gpio);</span><br><span class="line"> }</span><br><span class="line">fail_requestGpio:</span><br><span class="line">fail_getGpio:</span><br><span class="line">fail_nd:</span><br><span class="line"> <span class="keyword">return</span> ret;</span><br><span class="line"></span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/* 入口和出口 */</span></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">int</span> __init <span class="title">keyirq_init</span><span class="params">(<span class="keyword">void</span>)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">int</span> ret = <span class="number">0</span>;</span><br><span class="line"> </span><br><span class="line"> <span class="comment">/* 注册字符设备ID */</span></span><br><span class="line"> keyirq.major = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">if</span>(keyirq.major)</span><br><span class="line"> {</span><br><span class="line"> <span class="comment">/* 给定设备号 */</span></span><br><span class="line"> keyirq.devid = MKDEV(keyirq.major, <span class="number">0</span>);</span><br><span class="line"> ret = register_chrdev_region(keyirq.devid, KEYIRQ_CNT, KEYIRQ_NAME);</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> {</span><br><span class="line"> alloc_chrdev_region(&keyirq.devid, <span class="number">0</span>,KEYIRQ_CNT,KEYIRQ_NAME);</span><br><span class="line"> keyirq.major = MAJOR(keyirq.devid);</span><br><span class="line"> keyirq.minor = MINOR(keyirq.devid);</span><br><span class="line"> printk(<span class="string">"dev Major ID:%d\r\n"</span>,keyirq.major);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (ret < <span class="number">0</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">goto</span> fail_devid;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 初始化字符设备 */</span></span><br><span class="line"> keyirq.cdev.owner = THIS_MODULE;</span><br><span class="line"> cdev_init(&keyirq.cdev, &keyirq_fops);</span><br><span class="line"> ret = cdev_add(&keyirq.cdev, keyirq.devid, KEYIRQ_CNT);</span><br><span class="line"> <span class="keyword">if</span> (ret < <span class="number">0</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">goto</span> fail_cdev;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 创建设备类 */</span></span><br><span class="line"> keyirq<span class="class">.<span class="keyword">class</span> = <span class="title">class_create</span>(<span class="title">THIS_MODULE</span>, <span class="title">KEYIRQ_NAME</span>);</span></span><br><span class="line"> <span class="keyword">if</span> (IS_ERR(keyirq.class))</span><br><span class="line"> {</span><br><span class="line"> ret = PTR_ERR(keyirq.class);</span><br><span class="line"> <span class="keyword">goto</span> fail_class;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 创建设备节点 */</span></span><br><span class="line"> keyirq.device = device_create(keyirq.class, <span class="literal">NULL</span>, keyirq.devid, <span class="literal">NULL</span>, KEYIRQ_NAME);</span><br><span class="line"> <span class="keyword">if</span> (IS_ERR(keyirq.device))</span><br><span class="line"> {</span><br><span class="line"> ret = PTR_ERR(keyirq.device);</span><br><span class="line"> <span class="keyword">goto</span> fail_device;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 初始化IO */</span></span><br><span class="line"> ret = keyio_init(&keyirq);</span><br><span class="line"> <span class="keyword">if</span> (ret < <span class="number">0</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">goto</span> fail_init;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 初始化原子变量 */</span></span><br><span class="line"> atomic_set(&keyirq.keyValue, INVAKEY);</span><br><span class="line"> atomic_set(&keyirq.keyRelease, <span class="number">0</span>);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line"></span><br><span class="line">fail_init:</span><br><span class="line"> device_destroy(keyirq.class, keyirq.devid);</span><br><span class="line">fail_device:</span><br><span class="line"> class_destroy(keyirq.class);</span><br><span class="line">fail_class:</span><br><span class="line"> cdev_del(&keyirq.cdev);</span><br><span class="line">fail_cdev:</span><br><span class="line"> unregister_chrdev_region(keyirq.devid, KEYIRQ_CNT);</span><br><span class="line">fail_devid:</span><br><span class="line"> <span class="keyword">return</span> ret;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">void</span> __exit <span class="title">keyirq_exit</span><span class="params">(<span class="keyword">void</span>)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">int</span> i = <span class="number">0</span>;</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">for</span> (i = <span class="number">0</span>; i < KEY_NUM; i++)</span><br><span class="line"> {</span><br><span class="line"> <span class="comment">/* 释放中断和IO */</span></span><br><span class="line"> free_irq(keyirq.key[i].irqNum, &keyirq);</span><br><span class="line"> gpio_free(keyirq.key[i].gpio);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 删除定时器 */</span></span><br><span class="line"> del_timer_sync(&keyirq.timer);</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 注销字符设备驱动 */</span></span><br><span class="line"> device_destroy(keyirq.class, keyirq.devid);</span><br><span class="line"> class_destroy(keyirq.class);</span><br><span class="line"> cdev_del(&keyirq.cdev);</span><br><span class="line"> unregister_chrdev_region(keyirq.devid,KEYIRQ_CNT);</span><br><span class="line"></span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 注册驱动和卸载驱动 */</span></span><br><span class="line">module_init(keyirq_init);</span><br><span class="line">module_exit(keyirq_exit);</span><br><span class="line"></span><br><span class="line">MODULE_LICENSE(<span class="string">"GPL"</span>);</span><br><span class="line">MODULE_AUTHOR(<span class="string">"fengyuhang"</span>);</span><br></pre></td></tr></table></figure><h3 id="2-3-使用下半部tasklet的按键中断驱动程序"><a href="#2-3-使用下半部tasklet的按键中断驱动程序" class="headerlink" title="2.3 使用下半部tasklet的按键中断驱动程序"></a>2.3 使用下半部<code>tasklet</code>的按键中断驱动程序</h3><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span 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class="line">239</span><br><span class="line">240</span><br><span class="line">241</span><br><span class="line">242</span><br><span class="line">243</span><br><span class="line">244</span><br><span class="line">245</span><br><span class="line">246</span><br><span class="line">247</span><br><span class="line">248</span><br><span class="line">249</span><br><span class="line">250</span><br><span class="line">251</span><br><span class="line">252</span><br><span class="line">253</span><br><span class="line">254</span><br><span class="line">255</span><br><span class="line">256</span><br><span class="line">257</span><br><span class="line">258</span><br><span class="line">259</span><br><span class="line">260</span><br><span class="line">261</span><br><span class="line">262</span><br><span class="line">263</span><br><span class="line">264</span><br><span class="line">265</span><br><span class="line">266</span><br><span class="line">267</span><br><span class="line">268</span><br><span class="line">269</span><br><span class="line">270</span><br><span class="line">271</span><br><span class="line">272</span><br><span class="line">273</span><br><span class="line">274</span><br><span class="line">275</span><br><span class="line">276</span><br><span class="line">277</span><br><span class="line">278</span><br><span class="line">279</span><br><span class="line">280</span><br><span class="line">281</span><br><span class="line">282</span><br><span class="line">283</span><br><span class="line">284</span><br><span class="line">285</span><br><span class="line">286</span><br><span class="line">287</span><br><span class="line">288</span><br><span class="line">289</span><br><span class="line">290</span><br><span class="line">291</span><br><span class="line">292</span><br><span class="line">293</span><br><span class="line">294</span><br><span class="line">295</span><br><span class="line">296</span><br><span class="line">297</span><br><span class="line">298</span><br><span class="line">299</span><br><span class="line">300</span><br><span class="line">301</span><br><span class="line">302</span><br><span class="line">303</span><br><span class="line">304</span><br><span class="line">305</span><br><span class="line">306</span><br><span class="line">307</span><br><span class="line">308</span><br><span class="line">309</span><br><span class="line">310</span><br><span class="line">311</span><br><span class="line">312</span><br><span class="line">313</span><br><span class="line">314</span><br><span class="line">315</span><br><span class="line">316</span><br><span class="line">317</span><br><span class="line">318</span><br><span class="line">319</span><br><span class="line">320</span><br><span class="line">321</span><br><span class="line">322</span><br><span class="line">323</span><br><span class="line">324</span><br><span class="line">325</span><br><span class="line">326</span><br><span class="line">327</span><br><span class="line">328</span><br><span class="line">329</span><br><span class="line">330</span><br><span class="line">331</span><br><span class="line">332</span><br><span class="line">333</span><br><span class="line">334</span><br><span class="line">335</span><br><span class="line">336</span><br><span class="line">337</span><br><span class="line">338</span><br><span class="line">339</span><br><span class="line">340</span><br><span class="line">341</span><br><span class="line">342</span><br><span class="line">343</span><br><span class="line">344</span><br><span class="line">345</span><br><span class="line">346</span><br><span class="line">347</span><br><span class="line">348</span><br><span class="line">349</span><br><span class="line">350</span><br><span class="line">351</span><br><span class="line">352</span><br><span class="line">353</span><br><span class="line">354</span><br><span class="line">355</span><br><span class="line">356</span><br><span class="line">357</span><br><span class="line">358</span><br><span class="line">359</span><br><span class="line">360</span><br><span class="line">361</span><br><span class="line">362</span><br><span class="line">363</span><br><span class="line">364</span><br><span class="line">365</span><br><span class="line">366</span><br><span class="line">367</span><br><span class="line">368</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/types.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/kernel.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/delay.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/init.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/ide.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/module.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/errno.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/gpio.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/cdev.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/of.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/of_address.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/of_irq.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/of_gpio.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/timer.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/jiffies.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/string.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/irq.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><linux/interrupt.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><asm/mach/map.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><asm/uaccess.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><asm/io.h></span></span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> KEYIRQ_CNT 1</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> KEYIRQ_NAME <span class="meta-string">"keyirq"</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> KEY_NUM 1</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> KEY0_VALUE 0X01</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> INVAKEY 0XFF <span class="comment">/* 无效按键值 */</span></span></span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">key_dev</span></span></span><br><span class="line"><span class="class">{</span></span><br><span class="line"> <span class="keyword">int</span> gpio; <span class="comment">/* IO编号 */</span></span><br><span class="line"> <span class="keyword">int</span> irqNum; <span class="comment">/* 中断号 */</span></span><br><span class="line"> <span class="keyword">unsigned</span> <span class="keyword">char</span> value; <span class="comment">/* 按键值 */</span></span><br><span class="line"> <span class="keyword">char</span> name[<span class="number">10</span>]; <span class="comment">/* 名称 */</span></span><br><span class="line"> <span class="keyword">irqreturn_t</span> (*handler)(<span class="keyword">int</span>, <span class="keyword">void</span>*); <span class="comment">/* 中断处理函数 */</span></span><br><span class="line"></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">tasklet_struct</span> <span class="title">tasklet</span>;</span></span><br><span class="line">};</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/* 定义设备驱动结构体 */</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">keyirq_dev</span></span></span><br><span class="line"><span class="class">{</span></span><br><span class="line"> <span class="keyword">dev_t</span> devid; <span class="comment">/* 设备ID */</span></span><br><span class="line"> <span class="keyword">int</span> major; <span class="comment">/* 主设备号 */</span></span><br><span class="line"> <span class="keyword">int</span> minor; <span class="comment">/* 次设备号 */</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">cdev</span> <span class="title">cdev</span>;</span> <span class="comment">/* 字符设备结构体 */</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">class</span> *<span class="title">class</span>;</span> <span class="comment">/* 设备类 */</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">device</span> *<span class="title">device</span>;</span> <span class="comment">/* 设备节点 */</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">device_node</span> *<span class="title">nd</span>;</span> <span class="comment">/* 设备树节点 */</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">key_dev</span> <span class="title">key</span>[<span class="title">KEY_NUM</span>];</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">timer_list</span> <span class="title">timer</span>;</span> <span class="comment">/* 定时器 */</span></span><br><span class="line"></span><br><span class="line"> <span class="keyword">atomic_t</span> keyValue; <span class="comment">/* 按键值 */</span></span><br><span class="line"> <span class="keyword">atomic_t</span> keyRelease; <span class="comment">/* 按键是否释放 */</span></span><br><span class="line"> </span><br><span class="line">};</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">keyirq_dev</span> <span class="title">keyirq</span>;</span> <span class="comment">/* 定义一个keyirq设备 */</span></span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">int</span> <span class="title">keyirq_open</span><span class="params">(struct inode *inode, struct file *filp)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> filp->private_data = &keyirq;</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">} </span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">int</span> <span class="title">keyirq_release</span><span class="params">(struct inode *inode, struct file *filp)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">keyirq_dev</span> *<span class="title">dev</span> = <span class="title">filp</span>-><span class="title">private_data</span>;</span></span><br><span class="line"> </span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">ssize_t</span> <span class="title">keyirq_write</span><span class="params">(struct file *filp, <span class="keyword">const</span> <span class="keyword">char</span> __user *buf, <span class="keyword">size_t</span> count, <span class="keyword">loff_t</span> *ppos)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">keyirq_dev</span> *<span class="title">dev</span> = <span class="title">filp</span>-><span class="title">private_data</span>;</span></span><br><span class="line"> </span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">ssize_t</span> <span class="title">keyirq_read</span><span class="params">(struct file *filp, <span class="keyword">char</span> __user *buf, <span class="keyword">size_t</span> count, <span class="keyword">loff_t</span> *ppos)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">keyirq_dev</span> *<span class="title">dev</span> = <span class="title">filp</span>-><span class="title">private_data</span>;</span></span><br><span class="line"> <span class="keyword">int</span> ret = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">unsigned</span> <span class="keyword">char</span> keyValue;</span><br><span class="line"> <span class="keyword">unsigned</span> <span class="keyword">char</span> keyRelease;</span><br><span class="line"></span><br><span class="line"> keyValue = atomic_read(&dev->keyValue);</span><br><span class="line"> keyRelease = atomic_read(&dev->keyRelease);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (keyRelease)</span><br><span class="line"> {</span><br><span class="line"> <span class="comment">/* 一次有效按键 */</span></span><br><span class="line"> <span class="keyword">if</span> (keyValue & <span class="number">0X80</span>)</span><br><span class="line"> {</span><br><span class="line"> keyValue &= ~<span class="number">0X80</span>; <span class="comment">// 去除标记</span></span><br><span class="line"> ret = copy_to_user(buf, &keyValue, <span class="keyword">sizeof</span>(keyValue));</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">goto</span> data_err;</span><br><span class="line"> }</span><br><span class="line"> atomic_set(&dev->keyRelease, <span class="number">0</span>);</span><br><span class="line"> } </span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">goto</span> data_err;</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> ret;</span><br><span class="line">data_err:</span><br><span class="line"> <span class="keyword">return</span> -EINVAL;</span><br><span class="line"></span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 操作集 */</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">file_operations</span> <span class="title">keyirq_fops</span> = {</span></span><br><span class="line"> .owner = THIS_MODULE,</span><br><span class="line"> .<span class="built_in">open</span> = keyirq_open,</span><br><span class="line"> .<span class="built_in">release</span> = keyirq_release,</span><br><span class="line"> .<span class="built_in">write</span> = keyirq_write,</span><br><span class="line"> .<span class="built_in">read</span> = keyirq_read,</span><br><span class="line">};</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * @brief 定时器处理函数</span></span><br><span class="line"><span class="comment"> * @param arg 用户参数</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">void</span> <span class="title">timer_func</span><span class="params">(<span class="keyword">unsigned</span> <span class="keyword">long</span> arg)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">keyirq_dev</span> *<span class="title">dev</span> = (<span class="title">struct</span> <span class="title">keyirq_dev</span>*)<span class="title">arg</span>;</span></span><br><span class="line"> <span class="keyword">int</span> value = <span class="number">0</span>;</span><br><span class="line"></span><br><span class="line"> value = gpio_get_value(dev->key[<span class="number">0</span>].gpio);</span><br><span class="line"> <span class="keyword">if</span> (value == <span class="number">0</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="comment">// 按键按下</span></span><br><span class="line"> printk(<span class="string">"KEY0 Press!\r\n"</span>);</span><br><span class="line"> atomic_set(&dev->keyValue, dev->key[<span class="number">0</span>].value);</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span> <span class="keyword">if</span>(value == <span class="number">1</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="comment">// 按键释放</span></span><br><span class="line"> printk(<span class="string">"KEY0 Release!\r\n"</span>);</span><br><span class="line"> atomic_set(&dev->keyValue, dev->key[<span class="number">0</span>].value | <span class="number">0X80</span>); <span class="comment">// 打上标签，标记按键按下</span></span><br><span class="line"> atomic_set(&dev->keyRelease, <span class="number">1</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * @brief key0 tasklet 处理函数</span></span><br><span class="line"><span class="comment"> * @param arg 传递的参数</span></span><br><span class="line"><span class="comment"> */</span> </span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">void</span> <span class="title">key0_tasklet</span><span class="params">(<span class="keyword">unsigned</span> <span class="keyword">long</span> arg)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">keyirq_dev</span> *<span class="title">dev</span> = (<span class="title">struct</span> <span class="title">keyirq_dev</span> *)<span class="title">arg</span>;</span></span><br><span class="line"> </span><br><span class="line"> <span class="comment">/* 启动定时器来延时消抖 */</span></span><br><span class="line"> dev->timer.data = (<span class="keyword">volatile</span> <span class="keyword">unsigned</span> <span class="keyword">long</span>)arg;</span><br><span class="line"> mod_timer(&dev->timer, jiffies + msecs_to_jiffies(<span class="number">20</span>));</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * @brief 按键中断处理函数</span></span><br><span class="line"><span class="comment"> * @param irq 中断号</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">irqreturn_t</span> <span class="title">key0_handler</span><span class="params">(<span class="keyword">int</span> irq, <span class="keyword">void</span> *arg)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">keyirq_dev</span> *<span class="title">dev</span> = <span class="title">arg</span>;</span></span><br><span class="line"></span><br><span class="line"> tasklet_schedule(&dev->key[<span class="number">0</span>].tasklet); <span class="comment">/* 调度对应的tasklet */</span></span><br><span class="line"> <span class="keyword">return</span> IRQ_HANDLED;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * @brief 按键初始化</span></span><br><span class="line"><span class="comment"> * @param dev 设备结构体</span></span><br><span class="line"><span class="comment"> * @return 错误类型</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">int</span> <span class="title">keyio_init</span><span class="params">(struct keyirq_dev *dev)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">int</span> ret = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">int</span> i = <span class="number">0</span>;</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 按键初始化 */</span></span><br><span class="line"> dev->nd = of_find_node_by_path(<span class="string">"/key"</span>);</span><br><span class="line"> <span class="keyword">if</span> (dev->nd == <span class="literal">NULL</span>)</span><br><span class="line"> {</span><br><span class="line"> ret = -EINVAL;</span><br><span class="line"> <span class="keyword">goto</span> fail_nd;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 可能有多个按键，因此需要根据实际数量来读取 */</span></span><br><span class="line"> <span class="keyword">for</span> (i = <span class="number">0</span>; i < KEY_NUM; i++)</span><br><span class="line"> {</span><br><span class="line"> dev->key[i].gpio = of_get_named_gpio(dev->nd, <span class="string">"key-gpios"</span>, i);</span><br><span class="line"> <span class="keyword">if</span> (dev->key[i].gpio < <span class="number">0</span> )</span><br><span class="line"> {</span><br><span class="line"> ret = -EINVAL;</span><br><span class="line"> <span class="keyword">goto</span> fail_getGpio;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">for</span> (i = <span class="number">0</span>; i < KEY_NUM; i++)</span><br><span class="line"> {</span><br><span class="line"> <span class="built_in">memset</span>(dev->key[i].name, <span class="number">0</span>, <span class="keyword">sizeof</span>(dev->key[i].name));</span><br><span class="line"> <span class="built_in">sprintf</span>(dev->key[i].name, <span class="string">"KEY%d"</span>, i);</span><br><span class="line"> ret = gpio_request(dev->key[i].gpio, dev->key[i].name);</span><br><span class="line"> <span class="keyword">if</span> (ret < <span class="number">0</span> )</span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">goto</span> fail_requestGpio;</span><br><span class="line"> }</span><br><span class="line"> ret = gpio_direction_input(dev->key[i].gpio);</span><br><span class="line"> <span class="keyword">if</span> (ret < <span class="number">0</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">goto</span> fail_setGpioDir;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 获取中断号，两种方式皆可 */</span></span><br><span class="line"> dev->key[i].irqNum = gpio_to_irq(dev->key[i].gpio);</span><br><span class="line"> <span class="comment">// dev->key[i].irqNum = irq_of_parse_and_map(dev->nd, i);</span></span><br><span class="line"></span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> <span class="comment">/* 按键中断初始化 */</span></span><br><span class="line"> dev->key[<span class="number">0</span>].handler = key0_handler;</span><br><span class="line"> dev->key[<span class="number">0</span>].value = KEY0_VALUE;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">for</span> (i = <span class="number">0</span>; i < KEY_NUM; i++)</span><br><span class="line"> {</span><br><span class="line"> <span class="comment">/* 跳变沿触发方式 */</span></span><br><span class="line"> ret = request_irq(dev->key[i].irqNum, dev->key[i].handler, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, dev->key[i].name, dev);</span><br><span class="line"> <span class="keyword">if</span> (ret < <span class="number">0</span>)</span><br><span class="line"> {</span><br><span class="line"> printk(<span class="string">"irq %d request failed!\r\n"</span>, dev->key[i].irqNum);</span><br><span class="line"> <span class="keyword">goto</span> fail_irq;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* <span class="doctag">NOTE:</span>没有根据多个按键来初始化各自的tasklet,实际中需要根据情况来编写 */</span></span><br><span class="line"> tasklet_init(&dev->key[i].tasklet, key0_tasklet, (<span class="keyword">unsigned</span> <span class="keyword">long</span>)dev);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 初始化定时器 */</span></span><br><span class="line"> init_timer(&dev->timer);</span><br><span class="line"> dev->timer.function = timer_func;</span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line"></span><br><span class="line">fail_irq:</span><br><span class="line">fail_setGpioDir:</span><br><span class="line"> <span class="keyword">for</span> (i = i<span class="number">-1</span>; i >= <span class="number">0</span>; i--)</span><br><span class="line"> {</span><br><span class="line"> gpio_free(dev->key[i].gpio);</span><br><span class="line"> }</span><br><span class="line">fail_requestGpio:</span><br><span class="line">fail_getGpio:</span><br><span class="line">fail_nd:</span><br><span class="line"> <span class="keyword">return</span> ret;</span><br><span class="line"></span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/* 入口和出口 */</span></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">int</span> __init <span class="title">keyirq_init</span><span class="params">(<span class="keyword">void</span>)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">int</span> ret = <span class="number">0</span>;</span><br><span class="line"> </span><br><span class="line"> <span class="comment">/* 注册字符设备ID */</span></span><br><span class="line"> keyirq.major = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">if</span>(keyirq.major)</span><br><span class="line"> {</span><br><span class="line"> <span class="comment">/* 给定设备号 */</span></span><br><span class="line"> keyirq.devid = MKDEV(keyirq.major, <span class="number">0</span>);</span><br><span class="line"> ret = register_chrdev_region(keyirq.devid, KEYIRQ_CNT, KEYIRQ_NAME);</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> {</span><br><span class="line"> alloc_chrdev_region(&keyirq.devid, <span class="number">0</span>,KEYIRQ_CNT,KEYIRQ_NAME);</span><br><span class="line"> keyirq.major = MAJOR(keyirq.devid);</span><br><span class="line"> keyirq.minor = MINOR(keyirq.devid);</span><br><span class="line"> printk(<span class="string">"dev Major ID:%d\r\n"</span>,keyirq.major);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (ret < <span class="number">0</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">goto</span> fail_devid;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 初始化字符设备 */</span></span><br><span class="line"> keyirq.cdev.owner = THIS_MODULE;</span><br><span class="line"> cdev_init(&keyirq.cdev, &keyirq_fops);</span><br><span class="line"> ret = cdev_add(&keyirq.cdev, keyirq.devid, KEYIRQ_CNT);</span><br><span class="line"> <span class="keyword">if</span> (ret < <span class="number">0</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">goto</span> fail_cdev;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 创建设备类 */</span></span><br><span class="line"> keyirq<span class="class">.<span class="keyword">class</span> = <span class="title">class_create</span>(<span class="title">THIS_MODULE</span>, <span class="title">KEYIRQ_NAME</span>);</span></span><br><span class="line"> <span class="keyword">if</span> (IS_ERR(keyirq.class))</span><br><span class="line"> {</span><br><span class="line"> ret = PTR_ERR(keyirq.class);</span><br><span class="line"> <span class="keyword">goto</span> fail_class;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 创建设备节点 */</span></span><br><span class="line"> keyirq.device = device_create(keyirq.class, <span class="literal">NULL</span>, keyirq.devid, <span class="literal">NULL</span>, KEYIRQ_NAME);</span><br><span class="line"> <span class="keyword">if</span> (IS_ERR(keyirq.device))</span><br><span class="line"> {</span><br><span class="line"> ret = PTR_ERR(keyirq.device);</span><br><span class="line"> <span class="keyword">goto</span> fail_device;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 初始化IO */</span></span><br><span class="line"> ret = keyio_init(&keyirq);</span><br><span class="line"> <span class="keyword">if</span> (ret < <span class="number">0</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">goto</span> fail_init;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 初始化原子变量 */</span></span><br><span class="line"> atomic_set(&keyirq.keyValue, INVAKEY);</span><br><span class="line"> atomic_set(&keyirq.keyRelease, <span class="number">0</span>);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line"></span><br><span class="line">fail_init:</span><br><span class="line"> device_destroy(keyirq.class, keyirq.devid);</span><br><span class="line">fail_device:</span><br><span class="line"> class_destroy(keyirq.class);</span><br><span class="line">fail_class:</span><br><span class="line"> cdev_del(&keyirq.cdev);</span><br><span class="line">fail_cdev:</span><br><span class="line"> unregister_chrdev_region(keyirq.devid, KEYIRQ_CNT);</span><br><span class="line">fail_devid:</span><br><span class="line"> <span class="keyword">return</span> ret;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">void</span> __exit <span class="title">keyirq_exit</span><span class="params">(<span class="keyword">void</span>)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">int</span> i = <span class="number">0</span>;</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">for</span> (i = <span class="number">0</span>; i < KEY_NUM; i++)</span><br><span class="line"> {</span><br><span class="line"> <span class="comment">/* 释放中断和IO */</span></span><br><span class="line"> free_irq(keyirq.key[i].irqNum, &keyirq);</span><br><span class="line"> gpio_free(keyirq.key[i].gpio);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 删除定时器 */</span></span><br><span class="line"> del_timer_sync(&keyirq.timer);</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 注销字符设备驱动 */</span></span><br><span class="line"> device_destroy(keyirq.class, keyirq.devid);</span><br><span class="line"> class_destroy(keyirq.class);</span><br><span class="line"> cdev_del(&keyirq.cdev);</span><br><span class="line"> unregister_chrdev_region(keyirq.devid,KEYIRQ_CNT);</span><br><span class="line"></span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 注册驱动和卸载驱动 */</span></span><br><span class="line">module_init(keyirq_init);</span><br><span class="line">module_exit(keyirq_exit);</span><br><span class="line"></span><br><span class="line">MODULE_LICENSE(<span class="string">"GPL"</span>);</span><br><span class="line">MODULE_AUTHOR(<span class="string">"fengyuhang"</span>);</span><br></pre></td></tr></table></figure><h3 id="2-4-测试APP程序"><a href="#2-4-测试APP程序" class="headerlink" title="2.4 测试APP程序"></a>2.4 测试APP程序</h3><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><sys/types.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><sys/stat.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><sys/ioctl.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><fcntl.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><unistd.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><stdio.h></span></span></span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * ./keyReadAPP /dev/keyirq</span></span><br><span class="line"><span class="comment"> * @param argc 应用程序参数个数</span></span><br><span class="line"><span class="comment"> * @param argv 保存的参数，字符串形式。</span></span><br><span class="line"><span class="comment"> * */</span></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">main</span><span class="params">(<span class="keyword">int</span> argc, <span class="keyword">char</span> *argv[])</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">int</span> ret = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">int</span> fd = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">char</span> *filename;</span><br><span class="line"> <span class="keyword">unsigned</span> <span class="keyword">char</span> data;</span><br><span class="line"></span><br><span class="line"><span class="comment">/*</span></span><br><span class="line"><span class="comment"> if (argc != 3)</span></span><br><span class="line"><span class="comment"> {</span></span><br><span class="line"><span class="comment"> printf("输入错误\r\n");</span></span><br><span class="line"><span class="comment"> }</span></span><br><span class="line"><span class="comment">*/</span></span><br><span class="line"></span><br><span class="line"> filename = argv[<span class="number">1</span>];</span><br><span class="line"></span><br><span class="line"> fd = <span class="built_in">open</span>(filename, O_RDWR);</span><br><span class="line"> <span class="keyword">if</span>(fd < <span class="number">0</span>) {</span><br><span class="line"> <span class="built_in">printf</span>(<span class="string">"Error: Open %s fail.\r\n"</span>,filename);</span><br><span class="line"> <span class="keyword">return</span> <span class="number">-1</span>;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* 循环读取 */</span></span><br><span class="line"> <span class="keyword">while</span> (<span class="number">1</span>)</span><br><span class="line"> {</span><br><span class="line"> ret = <span class="built_in">read</span>(fd, &data, <span class="keyword">sizeof</span>(data));</span><br><span class="line"> <span class="keyword">if</span> (ret < <span class="number">0</span>)</span><br><span class="line"> { </span><br><span class="line"> </span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> {</span><br><span class="line"> <span class="built_in">printf</span>(<span class="string">"keyValue = %#x\r\n"</span>, data);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> </span><br><span class="line"> <span class="comment">/* 关闭 */</span></span><br><span class="line"> ret = <span class="built_in">close</span>(fd);</span><br><span class="line"> <span class="keyword">if</span> (ret < <span class="number">0</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="built_in">printf</span>(<span class="string">"Error: Close %s fail.\r\n"</span>, filename);</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure><div class="declare"><ul class="post-copyright"><li><strong>本文作者：</strong> 路痴的兔子</li><li><strong>本文链接：</strong> <a href="https:/proudrabbit.gitee.io/IMX6ULL嵌入式Linux驱动学习笔记（九）.html" title="IMX6ULL嵌入式Linux驱动学习笔记（九）" 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class="article-nav-title">IMX6ULL嵌入式Linux驱动学习笔记（八）</div><i class="icon-circle-right"></i></a></nav><aside class="wrap-side-operation"><div class="mod-side-operation"><div class="jump-container" id="js-jump-container" style="display:none"><a href="javascript:void(0)" class="mod-side-operation__jump-to-top"><i class="icon-font icon-back"></i></a><div id="js-jump-plan-container" class="jump-plan-container" style="top:-11px"><i class="icon-font icon-plane jump-plane"></i></div></div><div class="toc-container tooltip-left"><i class="icon-font icon-category"></i><div class="tooltip tooltip-east"><span class="tooltip-item"></span> <span class="tooltip-content"><div class="toc-article"><ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#一、Linux内核中断处理"><span class="toc-number">1.</span> <span class="toc-text">一、Linux内核中断处理</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#1-1-裸机中断"><span class="toc-number">1.1.</span> <span class="toc-text">1.1 裸机中断</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#1-2-Linux中断"><span class="toc-number">1.2.</span> <span class="toc-text">1.2 Linux中断</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#1-3-上半部和下半部"><span class="toc-number">1.3.</span> <span class="toc-text">1.3 上半部和下半部</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#1-3-1-软中断"><span class="toc-number">1.3.1.</span> <span class="toc-text">1.3.1 软中断</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#1-3-2-tasklet"><span class="toc-number">1.3.2.</span> <span class="toc-text">1.3.2 tasklet</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#1-3-3-工作队列"><span class="toc-number">1.3.3.</span> <span class="toc-text">1.3.3 工作队列</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#1-4-设备树中断节点信息"><span class="toc-number">1.4.</span> <span class="toc-text">1.4 设备树中断节点信息</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#二、编写按键中断实验驱动"><span class="toc-number">2.</span> <span class="toc-text">二、编写按键中断实验驱动</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#2-1-配置设备树"><span class="toc-number">2.1.</span> <span class="toc-text">2.1 配置设备树</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#2-2-按键中断驱动程序"><span class="toc-number">2.2.</span> <span class="toc-text">2.2 按键中断驱动程序</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#2-3-使用下半部tasklet的按键中断驱动程序"><span class="toc-number">2.3.</span> <span class="toc-text">2.3 使用下半部tasklet的按键中断驱动程序</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#2-4-测试APP程序"><span class="toc-number">2.4.</span> <span class="toc-text">2.4 测试APP程序</span></a></li></ol></li></ol></div></span></div></div></div></aside><div id="beaudar-comment"><link 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href="javascript:void(0)" class="js-tag color5">编程语言</a></li><div class="clearfix"></div></ul></div><ul class="search-ul"><p q-show="jsonFail" style="padding:20px;font-size:12px">缺失模块。<br>1、请确保node版本大于6.2<br>2、在博客根目录（注意不是yilia-plus根目录）执行以下命令：<br>npm i hexo-generator-json-content --save<br><br>3、在根目录_config.yml里添加配置：<pre style="font-size:12px" q-show="jsonFail">
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comments: false
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categories: false
tags: true
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