diff options
Diffstat (limited to 'kernel/drivers/usb/serial/usb_wwan.c')
| -rw-r--r-- | kernel/drivers/usb/serial/usb_wwan.c | 695 |
1 files changed, 695 insertions, 0 deletions
diff --git a/kernel/drivers/usb/serial/usb_wwan.c b/kernel/drivers/usb/serial/usb_wwan.c new file mode 100644 index 000000000..2f805cb38 --- /dev/null +++ b/kernel/drivers/usb/serial/usb_wwan.c @@ -0,0 +1,695 @@ +/* + 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_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" + +void usb_wwan_dtr_rts(struct usb_serial_port *port, int on) +{ + struct usb_wwan_port_private *portdata; + struct usb_wwan_intf_private *intfdata; + + intfdata = usb_get_serial_data(port->serial); + + if (!intfdata->send_setup) + return; + + portdata = usb_get_serial_port_data(port); + /* FIXME: locking */ + portdata->rts_state = on; + portdata->dtr_state = on; + + intfdata->send_setup(port); +} +EXPORT_SYMBOL(usb_wwan_dtr_rts); + +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 = usb_get_serial_data(port->serial); + + 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->minor; + tmp.port = 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; + + dev_dbg(&port->dev, "%s cmd 0x%04x\n", __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; + } + + dev_dbg(&port->dev, "%s arg not supported\n", __func__); + + return -ENOIOCTLCMD; +} +EXPORT_SYMBOL(usb_wwan_ioctl); + +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 = usb_get_serial_data(port->serial); + + dev_dbg(&port->dev, "%s: write (%d chars)\n", __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; + } + dev_dbg(&port->dev, "%s: endpoint %d buf %d\n", __func__, + usb_pipeendpoint(this_urb->pipe), i); + + err = usb_autopm_get_interface_async(port->serial->interface); + if (err < 0) { + clear_bit(i, &portdata->out_busy); + 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) { + dev_err(&port->dev, + "%s: submit urb %d failed: %d\n", + __func__, i, 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; + dev_dbg(&port->dev, "%s: wrote (did %d)\n", __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 device *dev; + unsigned char *data = urb->transfer_buffer; + int status = urb->status; + + endpoint = usb_pipeendpoint(urb->pipe); + port = urb->context; + dev = &port->dev; + + if (status) { + dev_dbg(dev, "%s: nonzero status: %d on endpoint %02x.\n", + __func__, status, endpoint); + } else { + if (urb->actual_length) { + tty_insert_flip_string(&port->port, data, + urb->actual_length); + tty_flip_buffer_push(&port->port); + } else + dev_dbg(dev, "%s: empty read urb received\n", __func__); + } + /* Resubmit urb so we continue receiving */ + err = usb_submit_urb(urb, GFP_ATOMIC); + if (err) { + if (err != -EPERM) { + dev_err(dev, "%s: resubmit read urb failed. (%d)\n", + __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 = usb_get_serial_data(port->serial); + + 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_atomic(); + 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; + } + + dev_dbg(&port->dev, "%s: %d\n", __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; + } + dev_dbg(&port->dev, "%s: %d\n", __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 = usb_get_serial_data(serial); + + if (port->interrupt_in_urb) { + err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); + if (err) { + dev_err(&port->dev, "%s: submit int urb failed: %d\n", + __func__, err); + } + } + + /* 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) { + dev_err(&port->dev, + "%s: submit read urb %d failed: %d\n", + __func__, i, err); + } + } + + spin_lock_irq(&intfdata->susp_lock); + if (++intfdata->open_ports == 1) + serial->interface->needs_remote_wakeup = 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); + +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; + } + } +} + +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 = usb_get_serial_data(serial); + struct urb *urb; + + portdata = usb_get_serial_port_data(port); + + /* + * Need to take susp_lock to make sure port is not already being + * resumed, but no need to hold it due to ASYNC_INITIALIZED. + */ + spin_lock_irq(&intfdata->susp_lock); + if (--intfdata->open_ports == 0) + serial->interface->needs_remote_wakeup = 0; + spin_unlock_irq(&intfdata->susp_lock); + + for (;;) { + urb = usb_get_from_anchor(&portdata->delayed); + if (!urb) + break; + unbusy_queued_urb(urb, portdata); + usb_autopm_put_interface_async(serial->interface); + } + + 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]); + usb_kill_urb(port->interrupt_in_urb); + + usb_autopm_get_interface_no_resume(serial->interface); +} +EXPORT_SYMBOL(usb_wwan_close); + +static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port, + int endpoint, + int dir, void *ctx, char *buf, int len, + void (*callback) (struct urb *)) +{ + struct usb_serial *serial = port->serial; + struct urb *urb; + + urb = usb_alloc_urb(0, GFP_KERNEL); /* No ISO */ + if (!urb) + return NULL; + + usb_fill_bulk_urb(urb, serial->dev, + usb_sndbulkpipe(serial->dev, endpoint) | dir, + buf, len, callback, ctx); + + return urb; +} + +int usb_wwan_port_probe(struct usb_serial_port *port) +{ + struct usb_wwan_port_private *portdata; + struct urb *urb; + u8 *buffer; + int i; + + if (!port->bulk_in_size || !port->bulk_out_size) + return -ENODEV; + + portdata = kzalloc(sizeof(*portdata), GFP_KERNEL); + if (!portdata) + return -ENOMEM; + + init_usb_anchor(&portdata->delayed); + + for (i = 0; i < N_IN_URB; i++) { + buffer = (u8 *)__get_free_page(GFP_KERNEL); + if (!buffer) + goto bail_out_error; + portdata->in_buffer[i] = buffer; + + urb = usb_wwan_setup_urb(port, port->bulk_in_endpointAddress, + USB_DIR_IN, port, + buffer, IN_BUFLEN, + usb_wwan_indat_callback); + portdata->in_urbs[i] = urb; + } + + for (i = 0; i < N_OUT_URB; i++) { + buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL); + if (!buffer) + goto bail_out_error2; + portdata->out_buffer[i] = buffer; + + urb = usb_wwan_setup_urb(port, port->bulk_out_endpointAddress, + USB_DIR_OUT, port, + buffer, OUT_BUFLEN, + usb_wwan_outdat_callback); + portdata->out_urbs[i] = urb; + } + + usb_set_serial_port_data(port, portdata); + + return 0; + +bail_out_error2: + for (i = 0; i < N_OUT_URB; i++) { + usb_free_urb(portdata->out_urbs[i]); + kfree(portdata->out_buffer[i]); + } +bail_out_error: + for (i = 0; i < N_IN_URB; i++) { + usb_free_urb(portdata->in_urbs[i]); + free_page((unsigned long)portdata->in_buffer[i]); + } + kfree(portdata); + + return -ENOMEM; +} +EXPORT_SYMBOL_GPL(usb_wwan_port_probe); + +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); + + for (i = 0; i < N_IN_URB; 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_free_urb(portdata->out_urbs[i]); + kfree(portdata->out_buffer[i]); + } + + kfree(portdata); + + return 0; +} +EXPORT_SYMBOL(usb_wwan_port_remove); + +#ifdef CONFIG_PM +static void stop_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); + 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]); + usb_kill_urb(port->interrupt_in_urb); + } +} + +int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message) +{ + struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial); + + spin_lock_irq(&intfdata->susp_lock); + if (PMSG_IS_AUTO(message)) { + if (intfdata->in_flight) { + spin_unlock_irq(&intfdata->susp_lock); + return -EBUSY; + } + } + intfdata->suspended = 1; + spin_unlock_irq(&intfdata->susp_lock); + + stop_urbs(serial); + + return 0; +} +EXPORT_SYMBOL(usb_wwan_suspend); + +/* Caller must hold susp_lock. */ +static int usb_wwan_submit_delayed_urbs(struct usb_serial_port *port) +{ + struct usb_serial *serial = port->serial; + struct usb_wwan_intf_private *data = usb_get_serial_data(serial); + struct usb_wwan_port_private *portdata; + struct urb *urb; + int err_count = 0; + int err; + + portdata = usb_get_serial_port_data(port); + + for (;;) { + urb = usb_get_from_anchor(&portdata->delayed); + if (!urb) + break; + + err = usb_submit_urb(urb, GFP_ATOMIC); + if (err) { + dev_err(&port->dev, "%s: submit urb failed: %d\n", + __func__, err); + err_count++; + unbusy_queued_urb(urb, portdata); + usb_autopm_put_interface_async(serial->interface); + continue; + } + data->in_flight++; + } + + if (err_count) + return -EIO; + + return 0; +} + +int usb_wwan_resume(struct usb_serial *serial) +{ + int i, j; + struct usb_serial_port *port; + struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial); + struct usb_wwan_port_private *portdata; + struct urb *urb; + int err; + int err_count = 0; + + spin_lock_irq(&intfdata->susp_lock); + for (i = 0; i < serial->num_ports; i++) { + port = serial->port[i]; + + if (!test_bit(ASYNCB_INITIALIZED, &port->port.flags)) + continue; + + portdata = usb_get_serial_port_data(port); + + if (port->interrupt_in_urb) { + err = usb_submit_urb(port->interrupt_in_urb, + GFP_ATOMIC); + if (err) { + dev_err(&port->dev, + "%s: submit int urb failed: %d\n", + __func__, err); + err_count++; + } + } + + err = usb_wwan_submit_delayed_urbs(port); + if (err) + err_count++; + + 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: submit read urb %d failed: %d\n", + __func__, i, err); + err_count++; + } + } + } + intfdata->suspended = 0; + spin_unlock_irq(&intfdata->susp_lock); + + if (err_count) + return -EIO; + + return 0; +} +EXPORT_SYMBOL(usb_wwan_resume); +#endif + +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); |