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linux-sg2042/drivers/usb/serial/usb_wwan.c

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/*
USB Driver layer for GSM modems
Copyright (C) 2005 Matthias Urlichs <smurf@smurf.noris.de>
This driver is free software; you can redistribute it and/or modify
it under the terms of Version 2 of the GNU General Public License as
published by the Free Software Foundation.
Portions copied from the Keyspan driver by Hugh Blemings <hugh@blemings.org>
History: see the git log.
Work sponsored by: Sigos GmbH, Germany <info@sigos.de>
This driver exists because the "normal" serial driver doesn't work too well
with GSM modems. Issues:
- data loss -- one single Receive URB is not nearly enough
- controlling the baud rate doesn't make sense
*/
#define DRIVER_VERSION "v0.7.2"
#define DRIVER_AUTHOR "Matthias Urlichs <smurf@smurf.noris.de>"
#define DRIVER_DESC "USB Driver for GSM modems"
#include <linux/kernel.h>
#include <linux/jiffies.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/bitops.h>
#include <linux/uaccess.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <linux/serial.h>
#include "usb-wwan.h"
static bool debug;
void usb_wwan_dtr_rts(struct usb_serial_port *port, int on)
{
struct usb_serial *serial = port->serial;
struct usb_wwan_port_private *portdata;
struct usb_wwan_intf_private *intfdata;
intfdata = port->serial->private;
if (!intfdata->send_setup)
return;
portdata = usb_get_serial_port_data(port);
mutex_lock(&serial->disc_mutex);
portdata->rts_state = on;
portdata->dtr_state = on;
if (serial->dev)
intfdata->send_setup(port);
mutex_unlock(&serial->disc_mutex);
}
EXPORT_SYMBOL(usb_wwan_dtr_rts);
void usb_wwan_set_termios(struct tty_struct *tty,
struct usb_serial_port *port,
struct ktermios *old_termios)
{
struct usb_wwan_intf_private *intfdata = port->serial->private;
/* Doesn't support option setting */
tty_termios_copy_hw(tty->termios, old_termios);
if (intfdata->send_setup)
intfdata->send_setup(port);
}
EXPORT_SYMBOL(usb_wwan_set_termios);
int usb_wwan_tiocmget(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
unsigned int value;
struct usb_wwan_port_private *portdata;
portdata = usb_get_serial_port_data(port);
value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
((portdata->dtr_state) ? TIOCM_DTR : 0) |
((portdata->cts_state) ? TIOCM_CTS : 0) |
((portdata->dsr_state) ? TIOCM_DSR : 0) |
((portdata->dcd_state) ? TIOCM_CAR : 0) |
((portdata->ri_state) ? TIOCM_RNG : 0);
return value;
}
EXPORT_SYMBOL(usb_wwan_tiocmget);
int usb_wwan_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_wwan_port_private *portdata;
struct usb_wwan_intf_private *intfdata;
portdata = usb_get_serial_port_data(port);
intfdata = port->serial->private;
if (!intfdata->send_setup)
return -EINVAL;
/* FIXME: what locks portdata fields ? */
if (set & TIOCM_RTS)
portdata->rts_state = 1;
if (set & TIOCM_DTR)
portdata->dtr_state = 1;
if (clear & TIOCM_RTS)
portdata->rts_state = 0;
if (clear & TIOCM_DTR)
portdata->dtr_state = 0;
return intfdata->send_setup(port);
}
EXPORT_SYMBOL(usb_wwan_tiocmset);
static int get_serial_info(struct usb_serial_port *port,
struct serial_struct __user *retinfo)
{
struct serial_struct tmp;
if (!retinfo)
return -EFAULT;
memset(&tmp, 0, sizeof(tmp));
tmp.line = port->serial->minor;
tmp.port = port->number;
tmp.baud_base = tty_get_baud_rate(port->port.tty);
tmp.close_delay = port->port.close_delay / 10;
tmp.closing_wait = port->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
ASYNC_CLOSING_WAIT_NONE :
port->port.closing_wait / 10;
if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
return -EFAULT;
return 0;
}
static int set_serial_info(struct usb_serial_port *port,
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(&port->port.mutex);
if (!capable(CAP_SYS_ADMIN)) {
if ((close_delay != port->port.close_delay) ||
(closing_wait != port->port.closing_wait))
retval = -EPERM;
else
retval = -EOPNOTSUPP;
} else {
port->port.close_delay = close_delay;
port->port.closing_wait = closing_wait;
}
mutex_unlock(&port->port.mutex);
return retval;
}
int usb_wwan_ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg)
{
struct usb_serial_port *port = tty->driver_data;
dbg("%s cmd 0x%04x", __func__, cmd);
switch (cmd) {
case TIOCGSERIAL:
return get_serial_info(port,
(struct serial_struct __user *) arg);
case TIOCSSERIAL:
return set_serial_info(port,
(struct serial_struct __user *) arg);
default:
break;
}
dbg("%s arg not supported", __func__);
return -ENOIOCTLCMD;
}
EXPORT_SYMBOL(usb_wwan_ioctl);
/* Write */
int usb_wwan_write(struct tty_struct *tty, struct usb_serial_port *port,
const unsigned char *buf, int count)
{
struct usb_wwan_port_private *portdata;
struct usb_wwan_intf_private *intfdata;
int i;
int left, todo;
struct urb *this_urb = NULL; /* spurious */
int err;
unsigned long flags;
portdata = usb_get_serial_port_data(port);
intfdata = port->serial->private;
dbg("%s: write (%d chars)", __func__, count);
i = 0;
left = count;
for (i = 0; left > 0 && i < N_OUT_URB; i++) {
todo = left;
if (todo > OUT_BUFLEN)
todo = OUT_BUFLEN;
this_urb = portdata->out_urbs[i];
if (test_and_set_bit(i, &portdata->out_busy)) {
if (time_before(jiffies,
portdata->tx_start_time[i] + 10 * HZ))
continue;
usb_unlink_urb(this_urb);
continue;
}
dbg("%s: endpoint %d buf %d", __func__,
usb_pipeendpoint(this_urb->pipe), i);
err = usb_autopm_get_interface_async(port->serial->interface);
if (err < 0)
break;
/* send the data */
memcpy(this_urb->transfer_buffer, buf, todo);
this_urb->transfer_buffer_length = todo;
spin_lock_irqsave(&intfdata->susp_lock, flags);
if (intfdata->suspended) {
usb_anchor_urb(this_urb, &portdata->delayed);
spin_unlock_irqrestore(&intfdata->susp_lock, flags);
} else {
intfdata->in_flight++;
spin_unlock_irqrestore(&intfdata->susp_lock, flags);
err = usb_submit_urb(this_urb, GFP_ATOMIC);
if (err) {
dbg("usb_submit_urb %p (write bulk) failed "
"(%d)", this_urb, err);
clear_bit(i, &portdata->out_busy);
spin_lock_irqsave(&intfdata->susp_lock, flags);
intfdata->in_flight--;
spin_unlock_irqrestore(&intfdata->susp_lock,
flags);
usb_autopm_put_interface_async(port->serial->interface);
break;
}
}
portdata->tx_start_time[i] = jiffies;
buf += todo;
left -= todo;
}
count -= left;
dbg("%s: wrote (did %d)", __func__, count);
return count;
}
EXPORT_SYMBOL(usb_wwan_write);
static void usb_wwan_indat_callback(struct urb *urb)
{
int err;
int endpoint;
struct usb_serial_port *port;
struct tty_struct *tty;
unsigned char *data = urb->transfer_buffer;
int status = urb->status;
endpoint = usb_pipeendpoint(urb->pipe);
port = urb->context;
if (status) {
dbg("%s: nonzero status: %d on endpoint %02x.",
__func__, status, endpoint);
} else {
tty = tty_port_tty_get(&port->port);
if (tty) {
if (urb->actual_length) {
tty_insert_flip_string(tty, data,
urb->actual_length);
tty_flip_buffer_push(tty);
} else
dbg("%s: empty read urb received", __func__);
tty_kref_put(tty);
}
/* Resubmit urb so we continue receiving */
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err) {
if (err != -EPERM) {
printk(KERN_ERR "%s: resubmit read urb failed. "
"(%d)", __func__, err);
/* busy also in error unless we are killed */
usb_mark_last_busy(port->serial->dev);
}
} else {
usb_mark_last_busy(port->serial->dev);
}
}
}
static void usb_wwan_outdat_callback(struct urb *urb)
{
struct usb_serial_port *port;
struct usb_wwan_port_private *portdata;
struct usb_wwan_intf_private *intfdata;
int i;
port = urb->context;
intfdata = port->serial->private;
usb_serial_port_softint(port);
usb_autopm_put_interface_async(port->serial->interface);
portdata = usb_get_serial_port_data(port);
spin_lock(&intfdata->susp_lock);
intfdata->in_flight--;
spin_unlock(&intfdata->susp_lock);
for (i = 0; i < N_OUT_URB; ++i) {
if (portdata->out_urbs[i] == urb) {
smp_mb__before_clear_bit();
clear_bit(i, &portdata->out_busy);
break;
}
}
}
int usb_wwan_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_wwan_port_private *portdata;
int i;
int data_len = 0;
struct urb *this_urb;
portdata = usb_get_serial_port_data(port);
for (i = 0; i < N_OUT_URB; i++) {
this_urb = portdata->out_urbs[i];
if (this_urb && !test_bit(i, &portdata->out_busy))
data_len += OUT_BUFLEN;
}
dbg("%s: %d", __func__, data_len);
return data_len;
}
EXPORT_SYMBOL(usb_wwan_write_room);
int usb_wwan_chars_in_buffer(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_wwan_port_private *portdata;
int i;
int data_len = 0;
struct urb *this_urb;
portdata = usb_get_serial_port_data(port);
for (i = 0; i < N_OUT_URB; i++) {
this_urb = portdata->out_urbs[i];
/* FIXME: This locking is insufficient as this_urb may
go unused during the test */
if (this_urb && test_bit(i, &portdata->out_busy))
data_len += this_urb->transfer_buffer_length;
}
dbg("%s: %d", __func__, data_len);
return data_len;
}
EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
{
struct usb_wwan_port_private *portdata;
struct usb_wwan_intf_private *intfdata;
struct usb_serial *serial = port->serial;
int i, err;
struct urb *urb;
portdata = usb_get_serial_port_data(port);
intfdata = serial->private;
/* Start reading from the IN endpoint */
for (i = 0; i < N_IN_URB; i++) {
urb = portdata->in_urbs[i];
if (!urb)
continue;
err = usb_submit_urb(urb, GFP_KERNEL);
if (err) {
dbg("%s: submit urb %d failed (%d) %d",
__func__, i, err, urb->transfer_buffer_length);
}
}
if (intfdata->send_setup)
intfdata->send_setup(port);
serial->interface->needs_remote_wakeup = 1;
spin_lock_irq(&intfdata->susp_lock);
portdata->opened = 1;
spin_unlock_irq(&intfdata->susp_lock);
/* this balances a get in the generic USB serial code */
usb_autopm_put_interface(serial->interface);
return 0;
}
EXPORT_SYMBOL(usb_wwan_open);
void usb_wwan_close(struct usb_serial_port *port)
{
int i;
struct usb_serial *serial = port->serial;
struct usb_wwan_port_private *portdata;
struct usb_wwan_intf_private *intfdata = port->serial->private;
portdata = usb_get_serial_port_data(port);
if (serial->dev) {
/* Stop reading/writing urbs */
spin_lock_irq(&intfdata->susp_lock);
portdata->opened = 0;
spin_unlock_irq(&intfdata->susp_lock);
for (i = 0; i < N_IN_URB; i++)
usb_kill_urb(portdata->in_urbs[i]);
for (i = 0; i < N_OUT_URB; i++)
usb_kill_urb(portdata->out_urbs[i]);
/* balancing - important as an error cannot be handled*/
usb_autopm_get_interface_no_resume(serial->interface);
serial->interface->needs_remote_wakeup = 0;
}
}
EXPORT_SYMBOL(usb_wwan_close);
/* Helper functions used by usb_wwan_setup_urbs */
static struct urb *usb_wwan_setup_urb(struct usb_serial *serial, int endpoint,
int dir, void *ctx, char *buf, int len,
void (*callback) (struct urb *))
{
struct urb *urb;
if (endpoint == -1)
return NULL; /* endpoint not needed */
urb = usb_alloc_urb(0, GFP_KERNEL); /* No ISO */
if (urb == NULL) {
dbg("%s: alloc for endpoint %d failed.", __func__, endpoint);
return NULL;
}
/* Fill URB using supplied data. */
usb_fill_bulk_urb(urb, serial->dev,
usb_sndbulkpipe(serial->dev, endpoint) | dir,
buf, len, callback, ctx);
return urb;
}
/* Setup urbs */
static void usb_wwan_setup_urbs(struct usb_serial *serial)
{
int i, j;
struct usb_serial_port *port;
struct usb_wwan_port_private *portdata;
for (i = 0; i < serial->num_ports; i++) {
port = serial->port[i];
portdata = usb_get_serial_port_data(port);
/* Do indat endpoints first */
for (j = 0; j < N_IN_URB; ++j) {
portdata->in_urbs[j] = usb_wwan_setup_urb(serial,
port->
bulk_in_endpointAddress,
USB_DIR_IN,
port,
portdata->
in_buffer[j],
IN_BUFLEN,
usb_wwan_indat_callback);
}
/* outdat endpoints */
for (j = 0; j < N_OUT_URB; ++j) {
portdata->out_urbs[j] = usb_wwan_setup_urb(serial,
port->
bulk_out_endpointAddress,
USB_DIR_OUT,
port,
portdata->
out_buffer
[j],
OUT_BUFLEN,
usb_wwan_outdat_callback);
}
}
}
int usb_wwan_startup(struct usb_serial *serial)
{
int i, j, err;
struct usb_serial_port *port;
struct usb_wwan_port_private *portdata;
u8 *buffer;
/* Now setup per port private data */
for (i = 0; i < serial->num_ports; i++) {
port = serial->port[i];
portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
if (!portdata) {
dbg("%s: kmalloc for usb_wwan_port_private (%d) failed!.",
__func__, i);
return 1;
}
init_usb_anchor(&portdata->delayed);
for (j = 0; j < N_IN_URB; j++) {
buffer = (u8 *) __get_free_page(GFP_KERNEL);
if (!buffer)
goto bail_out_error;
portdata->in_buffer[j] = buffer;
}
for (j = 0; j < N_OUT_URB; j++) {
buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
if (!buffer)
goto bail_out_error2;
portdata->out_buffer[j] = buffer;
}
usb_set_serial_port_data(port, portdata);
if (!port->interrupt_in_urb)
continue;
err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
if (err)
dbg("%s: submit irq_in urb failed %d", __func__, err);
}
usb_wwan_setup_urbs(serial);
return 0;
bail_out_error2:
for (j = 0; j < N_OUT_URB; j++)
kfree(portdata->out_buffer[j]);
bail_out_error:
for (j = 0; j < N_IN_URB; j++)
if (portdata->in_buffer[j])
free_page((unsigned long)portdata->in_buffer[j]);
kfree(portdata);
return 1;
}
EXPORT_SYMBOL(usb_wwan_startup);
int usb_wwan_port_remove(struct usb_serial_port *port)
{
int i;
struct usb_wwan_port_private *portdata;
portdata = usb_get_serial_port_data(port);
usb_set_serial_port_data(port, NULL);
/* Stop reading/writing urbs and free them */
for (i = 0; i < N_IN_URB; i++) {
usb_kill_urb(portdata->in_urbs[i]);
usb_free_urb(portdata->in_urbs[i]);
free_page((unsigned long)portdata->in_buffer[i]);
}
for (i = 0; i < N_OUT_URB; i++) {
usb_kill_urb(portdata->out_urbs[i]);
usb_free_urb(portdata->out_urbs[i]);
kfree(portdata->out_buffer[i]);
}
/* Now free port private data */
kfree(portdata);
return 0;
}
EXPORT_SYMBOL(usb_wwan_port_remove);
#ifdef CONFIG_PM
static void stop_read_write_urbs(struct usb_serial *serial)
{
int i, j;
struct usb_serial_port *port;
struct usb_wwan_port_private *portdata;
/* Stop reading/writing urbs */
for (i = 0; i < serial->num_ports; ++i) {
port = serial->port[i];
portdata = usb_get_serial_port_data(port);
if (!portdata)
continue;
for (j = 0; j < N_IN_URB; j++)
usb_kill_urb(portdata->in_urbs[j]);
for (j = 0; j < N_OUT_URB; j++)
usb_kill_urb(portdata->out_urbs[j]);
}
}
int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
{
struct usb_wwan_intf_private *intfdata = serial->private;
int b;
if (PMSG_IS_AUTO(message)) {
spin_lock_irq(&intfdata->susp_lock);
b = intfdata->in_flight;
spin_unlock_irq(&intfdata->susp_lock);
if (b)
return -EBUSY;
}
spin_lock_irq(&intfdata->susp_lock);
intfdata->suspended = 1;
spin_unlock_irq(&intfdata->susp_lock);
stop_read_write_urbs(serial);
return 0;
}
EXPORT_SYMBOL(usb_wwan_suspend);
static void unbusy_queued_urb(struct urb *urb, struct usb_wwan_port_private *portdata)
{
int i;
for (i = 0; i < N_OUT_URB; i++) {
if (urb == portdata->out_urbs[i]) {
clear_bit(i, &portdata->out_busy);
break;
}
}
}
static void play_delayed(struct usb_serial_port *port)
{
struct usb_wwan_intf_private *data;
struct usb_wwan_port_private *portdata;
struct urb *urb;
int err;
portdata = usb_get_serial_port_data(port);
data = port->serial->private;
while ((urb = usb_get_from_anchor(&portdata->delayed))) {
err = usb_submit_urb(urb, GFP_ATOMIC);
if (!err) {
data->in_flight++;
} else {
/* we have to throw away the rest */
do {
unbusy_queued_urb(urb, portdata);
usb_autopm_put_interface_no_suspend(port->serial->interface);
} while ((urb = usb_get_from_anchor(&portdata->delayed)));
break;
}
}
}
int usb_wwan_resume(struct usb_serial *serial)
{
int i, j;
struct usb_serial_port *port;
struct usb_wwan_intf_private *intfdata = serial->private;
struct usb_wwan_port_private *portdata;
struct urb *urb;
int err = 0;
/* get the interrupt URBs resubmitted unconditionally */
for (i = 0; i < serial->num_ports; i++) {
port = serial->port[i];
if (!port->interrupt_in_urb) {
dbg("%s: No interrupt URB for port %d", __func__, i);
continue;
}
err = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
dbg("Submitted interrupt URB for port %d (result %d)", i, err);
if (err < 0) {
dev_err(&port->dev, "%s: Error %d for interrupt URB\n",
__func__, err);
goto err_out;
}
}
for (i = 0; i < serial->num_ports; i++) {
/* walk all ports */
port = serial->port[i];
portdata = usb_get_serial_port_data(port);
/* skip closed ports */
spin_lock_irq(&intfdata->susp_lock);
if (!portdata || !portdata->opened) {
spin_unlock_irq(&intfdata->susp_lock);
continue;
}
for (j = 0; j < N_IN_URB; j++) {
urb = portdata->in_urbs[j];
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err < 0) {
dev_err(&port->dev, "%s: Error %d for bulk URB %d\n",
__func__, err, i);
spin_unlock_irq(&intfdata->susp_lock);
goto err_out;
}
}
play_delayed(port);
spin_unlock_irq(&intfdata->susp_lock);
}
spin_lock_irq(&intfdata->susp_lock);
intfdata->suspended = 0;
spin_unlock_irq(&intfdata->susp_lock);
err_out:
return err;
}
EXPORT_SYMBOL(usb_wwan_resume);
#endif
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL");
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug messages");
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