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xr_usb_serial_common.c
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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Copyright (c) 2015 Exar Corporation, Inc.
*
* This driver will work with any USB UART function in these Exar devices:
* XR21V1410/1412/1414
* XR21B1411
* XR21B1420/1422/1424
* XR22801/802/804
*
* The driver has been tested on various kernel versions from 3.6.x to 3.17.x.
* This driver may work on newer versions as well. There is a different driver available
* from www.exar.com that will work with kernel versions 2.6.18 to 3.4.x.
*
* ChangeLog:
* Version 1B - Initial released version.
* Version 1C - Add 9-bit mode support
*/
//#undef DEBUG
#undef VERBOSE_DEBUG
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/serial.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>
#include <linux/usb.h>
#include <linux/usb/cdc.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>
#include <linux/list.h>
#include "linux/version.h"
#include "xr_usb_serial_common.h"
#include "xr_usb_serial_ioctl.h"
#define DRIVER_AUTHOR "<uarttechsupport@exar.com>"
#define DRIVER_DESC "Exar USB UART (serial port) driver"
static struct usb_driver xr_usb_serial_driver;
static struct tty_driver *xr_usb_serial_tty_driver;
static struct xr_usb_serial *xr_usb_serial_table[XR_USB_SERIAL_TTY_MINORS];
static DEFINE_MUTEX(xr_usb_serial_table_lock);
static inline struct tty_driver *alloc_tty_driver(unsigned int lines)
{
struct tty_driver *ret = tty_alloc_driver(lines, 0);
if (IS_ERR(ret))
return NULL;
return ret;
}
/*
* xr_usb_serial_table accessors
*/
/*
* Look up an XR_USB_SERIAL structure by index. If found and not disconnected, increment
* its refcount and return it with its mutex held.
*/
static struct xr_usb_serial *xr_usb_serial_get_by_index(unsigned index)
{
struct xr_usb_serial *xr_usb_serial;
mutex_lock(&xr_usb_serial_table_lock);
xr_usb_serial = xr_usb_serial_table[index];
if (xr_usb_serial) {
mutex_lock(&xr_usb_serial->mutex);
if (xr_usb_serial->disconnected) {
mutex_unlock(&xr_usb_serial->mutex);
xr_usb_serial = NULL;
} else {
tty_port_get(&xr_usb_serial->port);
mutex_unlock(&xr_usb_serial->mutex);
}
}
mutex_unlock(&xr_usb_serial_table_lock);
return xr_usb_serial;
}
/*
* Try to find an available minor number and if found, associate it with 'xr_usb_serial'.
*/
static int xr_usb_serial_alloc_minor(struct xr_usb_serial *xr_usb_serial)
{
int minor;
mutex_lock(&xr_usb_serial_table_lock);
for (minor = 0; minor < XR_USB_SERIAL_TTY_MINORS; minor++) {
if (!xr_usb_serial_table[minor]) {
xr_usb_serial_table[minor] = xr_usb_serial;
break;
}
}
mutex_unlock(&xr_usb_serial_table_lock);
return minor;
}
/* Release the minor number associated with 'xr_usb_serial'. */
static void xr_usb_serial_release_minor(struct xr_usb_serial *xr_usb_serial)
{
mutex_lock(&xr_usb_serial_table_lock);
xr_usb_serial_table[xr_usb_serial->minor] = NULL;
mutex_unlock(&xr_usb_serial_table_lock);
}
/*
* Functions for XR_USB_SERIAL control messages.
*/
static int xr_usb_serial_ctrl_msg(struct xr_usb_serial *xr_usb_serial, int request, int value,
void *buf, int len)
{
int retval = usb_control_msg(xr_usb_serial->dev, usb_sndctrlpipe(xr_usb_serial->dev, 0),
request, USB_RT_XR_USB_SERIAL, value,
xr_usb_serial->control->altsetting[0].desc.bInterfaceNumber,
buf, len, 5000);
dev_dbg(&xr_usb_serial->control->dev,
"%s - rq 0x%02x, val %#x, len %#x, result %d\n",
__func__, request, value, len, retval);
return retval < 0 ? retval : 0;
}
#include "xr_usb_serial_hal.c"
/*
* Write buffer management.
* All of these assume proper locks taken by the caller.
*/
static int xr_usb_serial_wb_alloc(struct xr_usb_serial *xr_usb_serial)
{
int i, wbn;
struct xr_usb_serial_wb *wb;
wbn = 0;
i = 0;
for (;;) {
wb = &xr_usb_serial->wb[wbn];
if (!wb->use) {
wb->use = 1;
return wbn;
}
wbn = (wbn + 1) % XR_USB_SERIAL_NW;
if (++i >= XR_USB_SERIAL_NW)
return -1;
}
}
static int xr_usb_serial_wb_is_avail(struct xr_usb_serial *xr_usb_serial)
{
int i, n;
unsigned long flags;
n = XR_USB_SERIAL_NW;
spin_lock_irqsave(&xr_usb_serial->write_lock, flags);
for (i = 0; i < XR_USB_SERIAL_NW; i++)
n -= xr_usb_serial->wb[i].use;
spin_unlock_irqrestore(&xr_usb_serial->write_lock, flags);
return n;
}
/*
* Finish write. Caller must hold xr_usb_serial->write_lock
*/
static void xr_usb_serial_write_done(struct xr_usb_serial *xr_usb_serial, struct xr_usb_serial_wb *wb)
{
wb->use = 0;
xr_usb_serial->transmitting--;
usb_autopm_put_interface_async(xr_usb_serial->control);
}
/*
* Poke write.
*
* the caller is responsible for locking
*/
static int xr_usb_serial_start_wb(struct xr_usb_serial *xr_usb_serial, struct xr_usb_serial_wb *wb)
{
int rc;
xr_usb_serial->transmitting++;
wb->urb->transfer_buffer = wb->buf;
wb->urb->transfer_dma = wb->dmah;
wb->urb->transfer_buffer_length = wb->len;
wb->urb->dev = xr_usb_serial->dev;
rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
if (rc < 0) {
dev_err(&xr_usb_serial->data->dev,
"%s - usb_submit_urb(write bulk) failed: %d\n",
__func__, rc);
xr_usb_serial_write_done(xr_usb_serial, wb);
}
return rc;
}
/*
* attributes exported through sysfs
*/
static ssize_t show_caps
(struct device *dev, struct device_attribute *attr, char *buf)
{
struct usb_interface *intf = to_usb_interface(dev);
struct xr_usb_serial *xr_usb_serial = usb_get_intfdata(intf);
return sprintf(buf, "%d", xr_usb_serial->ctrl_caps);
}
static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
static ssize_t show_country_codes
(struct device *dev, struct device_attribute *attr, char *buf)
{
struct usb_interface *intf = to_usb_interface(dev);
struct xr_usb_serial *xr_usb_serial = usb_get_intfdata(intf);
memcpy(buf, xr_usb_serial->country_codes, xr_usb_serial->country_code_size);
return xr_usb_serial->country_code_size;
}
static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
static ssize_t show_country_rel_date
(struct device *dev, struct device_attribute *attr, char *buf)
{
struct usb_interface *intf = to_usb_interface(dev);
struct xr_usb_serial *xr_usb_serial = usb_get_intfdata(intf);
return sprintf(buf, "%d", xr_usb_serial->country_rel_date);
}
static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
/*
* Interrupt handlers for various XR_USB_SERIAL device responses
*/
/* control interface reports status changes with "interrupt" transfers */
static void xr_usb_serial_ctrl_irq(struct urb *urb)
{
struct xr_usb_serial *xr_usb_serial = urb->context;
struct usb_cdc_notification *dr = urb->transfer_buffer;
#if LINUX_VERSION_CODE > KERNEL_VERSION(3, 9, 0)
#else
struct tty_struct *tty;
#endif
unsigned char *data;
int newctrl;
int retval;
int status = urb->status;
int i;
unsigned char *p;
switch (status) {
case 0:
p = (unsigned char *)(urb->transfer_buffer);
for(i=0;i<urb->actual_length;i++)
{
dev_dbg(&xr_usb_serial->control->dev,"0x%02x\n",p[i]);
}
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dev_dbg(&xr_usb_serial->control->dev,
"%s - urb shutting down with status: %d\n",
__func__, status);
return;
default:
dev_dbg(&xr_usb_serial->control->dev,
"%s - nonzero urb status received: %d\n",
__func__, status);
goto exit;
}
usb_mark_last_busy(xr_usb_serial->dev);
data = (unsigned char *)(dr + 1);
switch (dr->bNotificationType) {
case USB_CDC_NOTIFY_NETWORK_CONNECTION:
dev_dbg(&xr_usb_serial->control->dev, "%s - network connection: %d\n",
__func__, dr->wValue);
break;
case USB_CDC_NOTIFY_SERIAL_STATE:
#if LINUX_VERSION_CODE > KERNEL_VERSION(3, 9, 0)
newctrl = get_unaligned_le16(data);
if (!xr_usb_serial->clocal && (xr_usb_serial->ctrlin & ~newctrl & XR_USB_SERIAL_CTRL_DCD)) {
dev_dbg(&xr_usb_serial->control->dev, "%s - calling hangup\n",
__func__);
tty_port_tty_hangup(&xr_usb_serial->port, false);
}
#else
tty = tty_port_tty_get(&xr_usb_serial->port);
newctrl = get_unaligned_le16(data);
if (tty)
{
if (!xr_usb_serial->clocal &&
(xr_usb_serial->ctrlin & ~newctrl & XR_USB_SERIAL_CTRL_DCD)) {
dev_dbg(&xr_usb_serial->control->dev,
"%s - calling hangup\n", __func__);
tty_hangup(tty);
}
tty_kref_put(tty);
}
#endif
xr_usb_serial->ctrlin = newctrl;
dev_dbg(&xr_usb_serial->control->dev,
"%s - input control lines: dcd%c dsr%c break%c "
"ring%c framing%c parity%c overrun%c\n",
__func__,
xr_usb_serial->ctrlin & XR_USB_SERIAL_CTRL_DCD ? '+' : '-',
xr_usb_serial->ctrlin & XR_USB_SERIAL_CTRL_DSR ? '+' : '-',
xr_usb_serial->ctrlin & XR_USB_SERIAL_CTRL_BRK ? '+' : '-',
xr_usb_serial->ctrlin & XR_USB_SERIAL_CTRL_RI ? '+' : '-',
xr_usb_serial->ctrlin & XR_USB_SERIAL_CTRL_FRAMING ? '+' : '-',
xr_usb_serial->ctrlin & XR_USB_SERIAL_CTRL_PARITY ? '+' : '-',
xr_usb_serial->ctrlin & XR_USB_SERIAL_CTRL_OVERRUN ? '+' : '-');
break;
default:
dev_dbg(&xr_usb_serial->control->dev,
"%s - unknown notification %d received: index %d "
"len %d data0 %d data1 %d\n",
__func__,
dr->bNotificationType, dr->wIndex,
dr->wLength, data[0], data[1]);
break;
}
exit:
retval = usb_submit_urb(urb, GFP_ATOMIC);
if (retval)
dev_err(&xr_usb_serial->control->dev, "%s - usb_submit_urb failed: %d\n",
__func__, retval);
}
static int xr_usb_serial_submit_read_urb(struct xr_usb_serial *xr_usb_serial, int index, gfp_t mem_flags)
{
int res;
if (!test_and_clear_bit(index, &xr_usb_serial->read_urbs_free))
return 0;
dev_vdbg(&xr_usb_serial->data->dev, "%s - urb %d\n", __func__, index);
res = usb_submit_urb(xr_usb_serial->read_urbs[index], mem_flags);
if (res) {
if (res != -EPERM) {
dev_err(&xr_usb_serial->data->dev,
"%s - usb_submit_urb failed: %d\n",
__func__, res);
}
set_bit(index, &xr_usb_serial->read_urbs_free);
return res;
}
return 0;
}
static int xr_usb_serial_submit_read_urbs(struct xr_usb_serial *xr_usb_serial, gfp_t mem_flags)
{
int res;
int i;
for (i = 0; i < xr_usb_serial->rx_buflimit; ++i) {
res = xr_usb_serial_submit_read_urb(xr_usb_serial, i, mem_flags);
if (res)
return res;
}
return 0;
}
static void xr_usb_serial_process_read_urb(struct xr_usb_serial *xr_usb_serial, struct urb *urb)
{
#if LINUX_VERSION_CODE > KERNEL_VERSION(3, 9, 0)
#else
struct tty_struct *tty;
#endif
int preciseflags = xr_usb_serial->preciseflags;
int have_extra_byte;
int length;
if (!urb->actual_length)
return;
if (preciseflags)
{
char *dp = urb->transfer_buffer;
int i, ch, ch_flags;
length = urb->actual_length;
length = length + (xr_usb_serial->have_extra_byte ? 1 : 0);
have_extra_byte = (preciseflags && (length & 1));
length = (preciseflags) ? (length / 2) : length;
for (i = 0; i < length; ++i)
{
char tty_flag;
if (i == 0)
{
if (xr_usb_serial->have_extra_byte)
{
ch = xr_usb_serial->extra_byte;
}
else
{
ch = *dp++;
}
}
else
{
ch = *dp++;
}
ch_flags = *dp++;
if (ch_flags & RAMCTL_BUFFER_PARITY)
tty_flag = TTY_PARITY;
else if (ch_flags & RAMCTL_BUFFER_BREAK)
tty_flag = TTY_BREAK;
else if (ch_flags & RAMCTL_BUFFER_FRAME)
tty_flag = TTY_FRAME;
else if (ch_flags & RAMCTL_BUFFER_OVERRUN)
tty_flag = TTY_OVERRUN;
else
tty_flag = TTY_NORMAL;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 9, 0)
tty_insert_flip_char(&xr_usb_serial->port, ch, tty_flag);
tty_flip_buffer_push(&xr_usb_serial->port);
#else
tty = tty_port_tty_get(&xr_usb_serial->port);
if (!tty)
return;
tty_insert_flip_char(&xr_usb_serial->port, ch, tty_flag);
tty_flip_buffer_push(tty);
tty_kref_put(tty);
#endif
}
}
else
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 9, 0)
tty_insert_flip_string(&xr_usb_serial->port, urb->transfer_buffer,
urb->actual_length);
tty_flip_buffer_push(&xr_usb_serial->port);
#else
tty = tty_port_tty_get(&xr_usb_serial->port);
if (!tty)
return;
tty_insert_flip_string(tty, urb->transfer_buffer, urb->actual_length);
tty_flip_buffer_push(tty);
tty_kref_put(tty);
#endif
}
}
static void xr_usb_serial_read_bulk_callback(struct urb *urb)
{
struct xr_usb_serial_rb *rb = urb->context;
struct xr_usb_serial *xr_usb_serial = rb->instance;
unsigned long flags;
dev_vdbg(&xr_usb_serial->data->dev, "%s - urb %d, len %d\n", __func__,
rb->index, urb->actual_length);
set_bit(rb->index, &xr_usb_serial->read_urbs_free);
if (!xr_usb_serial->dev) {
dev_dbg(&xr_usb_serial->data->dev, "%s - disconnected\n", __func__);
return;
}
usb_mark_last_busy(xr_usb_serial->dev);
if (urb->status) {
dev_dbg(&xr_usb_serial->data->dev, "%s - non-zero urb status: %d\n",
__func__, urb->status);
//return;
}
xr_usb_serial_process_read_urb(xr_usb_serial, urb);
/* throttle device if requested by tty */
spin_lock_irqsave(&xr_usb_serial->read_lock, flags);
xr_usb_serial->throttled = xr_usb_serial->throttle_req;
if (!xr_usb_serial->throttled && !xr_usb_serial->susp_count) {
spin_unlock_irqrestore(&xr_usb_serial->read_lock, flags);
xr_usb_serial_submit_read_urb(xr_usb_serial, rb->index, GFP_ATOMIC);
} else {
spin_unlock_irqrestore(&xr_usb_serial->read_lock, flags);
}
}
/* data interface wrote those outgoing bytes */
static void xr_usb_serial_write_bulk(struct urb *urb)
{
struct xr_usb_serial_wb *wb = urb->context;
struct xr_usb_serial *xr_usb_serial = wb->instance;
unsigned long flags;
if (urb->status || (urb->actual_length != urb->transfer_buffer_length))
dev_vdbg(&xr_usb_serial->data->dev, "%s - len %d/%d, status %d\n",
__func__,
urb->actual_length,
urb->transfer_buffer_length,
urb->status);
spin_lock_irqsave(&xr_usb_serial->write_lock, flags);
xr_usb_serial_write_done(xr_usb_serial, wb);
spin_unlock_irqrestore(&xr_usb_serial->write_lock, flags);
schedule_work(&xr_usb_serial->work);
}
static void xr_usb_serial_softint(struct work_struct *work)
{
struct xr_usb_serial *xr_usb_serial = container_of(work, struct xr_usb_serial, work);
#if LINUX_VERSION_CODE > KERNEL_VERSION(3, 9, 0)
#else
struct tty_struct *tty;
#endif
dev_vdbg(&xr_usb_serial->data->dev, "%s\n", __func__);
#if LINUX_VERSION_CODE > KERNEL_VERSION(3, 9, 0)
tty_port_tty_wakeup(&xr_usb_serial->port);
#else
tty = tty_port_tty_get(&xr_usb_serial->port);
if (!tty)
return;
tty_wakeup(tty);
tty_kref_put(tty);
#endif
}
/*
* TTY handlers
*/
static int xr_usb_serial_tty_install(struct tty_driver *driver, struct tty_struct *tty)
{
struct xr_usb_serial *xr_usb_serial;
int retval;
dev_dbg(tty->dev, "%s\n", __func__);
xr_usb_serial = xr_usb_serial_get_by_index(tty->index);
if (!xr_usb_serial)
return -ENODEV;
retval = tty_standard_install(driver, tty);
if (retval)
goto error_init_termios;
tty->driver_data = xr_usb_serial;
return 0;
error_init_termios:
tty_port_put(&xr_usb_serial->port);
return retval;
}
static int xr_usb_serial_tty_open(struct tty_struct *tty, struct file *filp)
{
struct xr_usb_serial *xr_usb_serial = tty->driver_data;
int result;
result = xr_usb_serial_fifo_reset(xr_usb_serial);
dev_dbg(tty->dev, "%s\n", __func__);
return tty_port_open(&xr_usb_serial->port, tty, filp);
}
static int xr_usb_serial_port_activate(struct tty_port *port, struct tty_struct *tty)
{
struct xr_usb_serial *xr_usb_serial = container_of(port, struct xr_usb_serial, port);
int retval = -ENODEV;
dev_dbg(&xr_usb_serial->control->dev, "%s\n", __func__);
mutex_lock(&xr_usb_serial->mutex);
if (xr_usb_serial->disconnected)
goto disconnected;
retval = usb_autopm_get_interface(xr_usb_serial->control);
if (retval)
goto error_get_interface;
/*
* FIXME: Why do we need this? Allocating 64K of physically contiguous
* memory is really nasty...
*/
set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
xr_usb_serial->control->needs_remote_wakeup = 1;
xr_usb_serial->ctrlurb->dev = xr_usb_serial->dev;
if (usb_submit_urb(xr_usb_serial->ctrlurb, GFP_KERNEL)) {
dev_err(&xr_usb_serial->control->dev,
"%s - usb_submit_urb(ctrl irq) failed\n", __func__);
goto error_submit_urb;
}
xr_usb_serial->ctrlout = XR_USB_SERIAL_CTRL_DTR | XR_USB_SERIAL_CTRL_RTS;
if (xr_usb_serial_set_control(xr_usb_serial, xr_usb_serial->ctrlout) < 0 &&
(xr_usb_serial->ctrl_caps & USB_CDC_CAP_LINE))
goto error_set_control;
usb_autopm_put_interface(xr_usb_serial->control);
/*
* Unthrottle device in case the TTY was closed while throttled.
*/
spin_lock_irq(&xr_usb_serial->read_lock);
xr_usb_serial->throttled = 0;
xr_usb_serial->throttle_req = 0;
spin_unlock_irq(&xr_usb_serial->read_lock);
if (xr_usb_serial_submit_read_urbs(xr_usb_serial, GFP_KERNEL))
goto error_submit_read_urbs;
mutex_unlock(&xr_usb_serial->mutex);
return 0;
error_submit_read_urbs:
xr_usb_serial->ctrlout = 0;
xr_usb_serial_set_control(xr_usb_serial, xr_usb_serial->ctrlout);
error_set_control:
usb_kill_urb(xr_usb_serial->ctrlurb);
error_submit_urb:
usb_autopm_put_interface(xr_usb_serial->control);
error_get_interface:
disconnected:
mutex_unlock(&xr_usb_serial->mutex);
return retval;
}
static void xr_usb_serial_port_destruct(struct tty_port *port)
{
struct xr_usb_serial *xr_usb_serial = container_of(port, struct xr_usb_serial, port);
dev_dbg(&xr_usb_serial->control->dev, "%s\n", __func__);
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 7, 0)
tty_unregister_device(xr_usb_serial_tty_driver, xr_usb_serial->minor);
#endif
xr_usb_serial_release_minor(xr_usb_serial);
usb_put_intf(xr_usb_serial->control);
kfree(xr_usb_serial->country_codes);
kfree(xr_usb_serial);
}
static void xr_usb_serial_port_shutdown(struct tty_port *port)
{
struct xr_usb_serial *xr_usb_serial = container_of(port, struct xr_usb_serial, port);
int i;
dev_dbg(&xr_usb_serial->control->dev, "%s\n", __func__);
mutex_lock(&xr_usb_serial->mutex);
if (!xr_usb_serial->disconnected) {
usb_autopm_get_interface(xr_usb_serial->control);
xr_usb_serial_set_control(xr_usb_serial, xr_usb_serial->ctrlout = 0);
usb_kill_urb(xr_usb_serial->ctrlurb);
for (i = 0; i < XR_USB_SERIAL_NW; i++)
usb_kill_urb(xr_usb_serial->wb[i].urb);
for (i = 0; i < xr_usb_serial->rx_buflimit; i++)
usb_kill_urb(xr_usb_serial->read_urbs[i]);
xr_usb_serial->control->needs_remote_wakeup = 0;
usb_autopm_put_interface(xr_usb_serial->control);
}
mutex_unlock(&xr_usb_serial->mutex);
}
static void xr_usb_serial_tty_cleanup(struct tty_struct *tty)
{
struct xr_usb_serial *xr_usb_serial = tty->driver_data;
dev_dbg(&xr_usb_serial->control->dev, "%s\n", __func__);
tty_port_put(&xr_usb_serial->port);
}
static void xr_usb_serial_tty_hangup(struct tty_struct *tty)
{
struct xr_usb_serial *xr_usb_serial = tty->driver_data;
dev_dbg(&xr_usb_serial->control->dev, "%s\n", __func__);
tty_port_hangup(&xr_usb_serial->port);
}
static void xr_usb_serial_tty_close(struct tty_struct *tty, struct file *filp)
{
struct xr_usb_serial *xr_usb_serial = tty->driver_data;
dev_dbg(&xr_usb_serial->control->dev, "%s\n", __func__);
tty_port_close(&xr_usb_serial->port, tty, filp);
}
static int xr_usb_serial_tty_write(struct tty_struct *tty,
const unsigned char *buf, int count)
{
struct xr_usb_serial *xr_usb_serial = tty->driver_data;
int stat;
unsigned long flags;
int wbn;
struct xr_usb_serial_wb *wb;
if (!count)
return 0;
//dev_vdbg(&xr_usb_serial->data->dev, "%s - count %d\n", __func__, count);
spin_lock_irqsave(&xr_usb_serial->write_lock, flags);
wbn = xr_usb_serial_wb_alloc(xr_usb_serial);
if (wbn < 0) {
spin_unlock_irqrestore(&xr_usb_serial->write_lock, flags);
return 0;
}
wb = &xr_usb_serial->wb[wbn];
if (!xr_usb_serial->dev) {
wb->use = 0;
spin_unlock_irqrestore(&xr_usb_serial->write_lock, flags);
return -ENODEV;
}
count = (count > xr_usb_serial->writesize) ? xr_usb_serial->writesize : count;
//dev_vdbg(&xr_usb_serial->data->dev, "%s - write %d\n", __func__, count);
memcpy(wb->buf, buf, count);
wb->len = count;
usb_autopm_get_interface_async(xr_usb_serial->control);
if (xr_usb_serial->susp_count) {
if (!xr_usb_serial->delayed_wb)
xr_usb_serial->delayed_wb = wb;
else
usb_autopm_put_interface_async(xr_usb_serial->control);
spin_unlock_irqrestore(&xr_usb_serial->write_lock, flags);
return count; /* A white lie */
}
usb_mark_last_busy(xr_usb_serial->dev);
stat = xr_usb_serial_start_wb(xr_usb_serial, wb);
spin_unlock_irqrestore(&xr_usb_serial->write_lock, flags);
if (stat < 0)
return stat;
return count;
}
static unsigned int xr_usb_serial_tty_write_room(struct tty_struct *tty)
{
struct xr_usb_serial *xr_usb_serial = tty->driver_data;
/*
* Do not let the line discipline to know that we have a reserve,
* or it might get too enthusiastic.
*/
return xr_usb_serial_wb_is_avail(xr_usb_serial) ? xr_usb_serial->writesize : 0;
}
static unsigned int xr_usb_serial_tty_chars_in_buffer(struct tty_struct *tty)
{
struct xr_usb_serial *xr_usb_serial = tty->driver_data;
/*
* if the device was unplugged then any remaining characters fell out
* of the connector ;)
*/
if (xr_usb_serial->disconnected)
return 0;
/*
* This is inaccurate (overcounts), but it works.
*/
return (XR_USB_SERIAL_NW - xr_usb_serial_wb_is_avail(xr_usb_serial)) * xr_usb_serial->writesize;
}
static void xr_usb_serial_tty_throttle(struct tty_struct *tty)
{
struct xr_usb_serial *xr_usb_serial = tty->driver_data;
spin_lock_irq(&xr_usb_serial->read_lock);
xr_usb_serial->throttle_req = 1;
spin_unlock_irq(&xr_usb_serial->read_lock);
}
static void xr_usb_serial_tty_unthrottle(struct tty_struct *tty)
{
struct xr_usb_serial *xr_usb_serial = tty->driver_data;
unsigned int was_throttled;
spin_lock_irq(&xr_usb_serial->read_lock);
was_throttled = xr_usb_serial->throttled;
xr_usb_serial->throttled = 0;
xr_usb_serial->throttle_req = 0;
spin_unlock_irq(&xr_usb_serial->read_lock);
if (was_throttled)
xr_usb_serial_submit_read_urbs(xr_usb_serial, GFP_KERNEL);
}
static int xr_usb_serial_tty_break_ctl(struct tty_struct *tty, int state)
{
struct xr_usb_serial *xr_usb_serial = tty->driver_data;
int retval;
retval = xr_usb_serial_send_break(xr_usb_serial, state ? 0xffff : 0);
if (retval < 0)
dev_err(&xr_usb_serial->control->dev, "%s - send break failed\n",
__func__);
return retval;
}
static int xr_usb_serial_tty_tiocmget(struct tty_struct *tty)
{
struct xr_usb_serial *xr_usb_serial = tty->driver_data;
//dev_dbg(&xr_usb_serial->control->dev, "xr_usb_serial_tty_tiocmget\n");
return xr_usb_serial_tiocmget(xr_usb_serial);
}
static int xr_usb_serial_tty_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear)
{
struct xr_usb_serial *xr_usb_serial = tty->driver_data;
//dev_dbg(&xr_usb_serial->control->dev, "xr_usb_serial_tty_tiocmset set=0x%x clear=0x%x\n",set,clear);
return xr_usb_serial_tiocmset(xr_usb_serial,set,clear);
}
static int get_serial_info(struct xr_usb_serial *xr_usb_serial, struct serial_struct __user *info)
{
struct serial_struct tmp;
if (!info)
return -EINVAL;
memset(&tmp, 0, sizeof(tmp));
tmp.flags = ASYNC_LOW_LATENCY;
tmp.xmit_fifo_size = xr_usb_serial->writesize;
tmp.baud_base = le32_to_cpu(xr_usb_serial->line.dwDTERate);
tmp.close_delay = xr_usb_serial->port.close_delay / 10;
tmp.closing_wait = xr_usb_serial->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
ASYNC_CLOSING_WAIT_NONE :
xr_usb_serial->port.closing_wait / 10;
if (copy_to_user(info, &tmp, sizeof(tmp)))
return -EFAULT;
else
return 0;
}
static int set_serial_info(struct xr_usb_serial *xr_usb_serial,
struct serial_struct __user *newinfo)
{
struct serial_struct new_serial;
unsigned int closing_wait, close_delay;
int retval = 0;
if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
return -EFAULT;
close_delay = new_serial.close_delay * 10;
closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
mutex_lock(&xr_usb_serial->port.mutex);
if (!capable(CAP_SYS_ADMIN)) {
if ((close_delay != xr_usb_serial->port.close_delay) ||
(closing_wait != xr_usb_serial->port.closing_wait))
retval = -EPERM;
else
retval = -EOPNOTSUPP;
} else {
xr_usb_serial->port.close_delay = close_delay;
xr_usb_serial->port.closing_wait = closing_wait;
}
mutex_unlock(&xr_usb_serial->port.mutex);
return retval;
}
static int xr_usb_serial_tty_ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg)
{
struct xr_usb_serial *xr_usb_serial = tty->driver_data;
int rv = -ENOIOCTLCMD;
unsigned int channel, reg, val,preciseflags;
int baud_rate = 0;
struct usb_cdc_line_coding newline;
short data;
switch (cmd) {
case TIOCGSERIAL: /* gets serial port data */
rv = get_serial_info(xr_usb_serial, (struct serial_struct __user *) arg);
break;
case TIOCSSERIAL:
rv = set_serial_info(xr_usb_serial, (struct serial_struct __user *) arg);
break;
case XR_USB_SERIAL_GET_REG:
if (get_user(channel, (int __user *)arg))
return -EFAULT;
if (get_user(reg, (int __user *)(arg + sizeof(int))))
return -EFAULT;
if (channel == -1)
{
rv = xr_usb_serial_get_reg(xr_usb_serial,reg, &data);
}
else
{
rv = xr_usb_serial_get_reg_ext(xr_usb_serial,channel,reg, &data);
}
if (rv < 0)
{
dev_err(&xr_usb_serial->control->dev, "Cannot get register (%d)\n", rv);
return -EFAULT;
}
if (put_user(le16_to_cpu(data), (int __user *)(arg + 2 * sizeof(int))))
{
dev_err(&xr_usb_serial->control->dev, "Cannot put user result\n");
return -EFAULT;
}
rv = 0;
break;
case XR_USB_SERIAL_SET_REG:
if (get_user(channel, (int __user *)arg))
return -EFAULT;
if (get_user(reg, (int __user *)(arg + sizeof(int))))
return -EFAULT;
if (get_user(val, (int __user *)(arg + 2 * sizeof(int))))
return -EFAULT;
if (channel == -1)
{
rv = xr_usb_serial_set_reg(xr_usb_serial,reg, val);
}
else
{
rv = xr_usb_serial_set_reg_ext(xr_usb_serial,channel,reg, val);
}
if (rv < 0)
return -EFAULT;
rv = 0;
break;
case XR_USB_SERIAL_LOOPBACK:
if (get_user(channel, (int __user *)arg))
return -EFAULT;
if (channel == -1)
channel = xr_usb_serial->channel;
rv = xr_usb_serial_set_loopback(xr_usb_serial,channel);
if (rv < 0)
return -EFAULT;
rv = 0;
break;
case XR_USB_SERIAL_SET_GPIO_MODE_REG:
xr_usb_serial_disable(xr_usb_serial);
if (get_user(channel, (int __user *)arg))
return -EFAULT;
if (get_user(val, (int __user *)(arg + sizeof(int))))
return -EFAULT;
if (channel == -1)
{
//block = portdata->block;
rv = xr_usb_serial_set_reg(xr_usb_serial,xr_usb_serial->reg_map.uart_gpio_mode_addr, val);
}
else
{
rv = xr_usb_serial_set_reg_ext(xr_usb_serial,channel,xr_usb_serial->reg_map.uart_gpio_mode_addr, val);
}
dev_dbg(&xr_usb_serial->control->dev, "XR_USB_SERIAL_SET_GPIO_MODE_REG 0x%x val:0x%x \n", xr_usb_serial->reg_map.uart_gpio_mode_addr,val);
xr_usb_serial_enable(xr_usb_serial);
if (rv < 0)
return -EFAULT;
break;
case XR_USB_SERIAL_GET_GPIO_MODE_REG: