diff options
Diffstat (limited to 'drivers/usb/serial/sierra.c')
| -rw-r--r-- | drivers/usb/serial/sierra.c | 162 |
1 files changed, 157 insertions, 5 deletions
diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c index 55391bb..8c075b2 100644 --- a/drivers/usb/serial/sierra.c +++ b/drivers/usb/serial/sierra.c @@ -51,6 +51,12 @@ struct sierra_iface_info { const u8 *ifaceinfo; /* pointer to the array holding the numbers */ }; +struct sierra_intf_private { + spinlock_t susp_lock; + unsigned int suspended:1; + int in_flight; +}; + static int sierra_set_power_state(struct usb_device *udev, __u16 swiState) { int result; @@ -144,6 +150,7 @@ static int sierra_probe(struct usb_serial *serial, { int result = 0; struct usb_device *udev; + struct sierra_intf_private *data; u8 ifnum; udev = serial->dev; @@ -171,6 +178,11 @@ static int sierra_probe(struct usb_serial *serial, return -ENODEV; } + data = serial->private = kzalloc(sizeof(struct sierra_intf_private), GFP_KERNEL); + if (!data) + return -ENOMEM; + spin_lock_init(&data->susp_lock); + return result; } @@ -261,13 +273,18 @@ static struct usb_driver sierra_driver = { .name = "sierra", .probe = usb_serial_probe, .disconnect = usb_serial_disconnect, + .suspend = usb_serial_suspend, + .resume = usb_serial_resume, .id_table = id_table, .no_dynamic_id = 1, + .supports_autosuspend = 1, }; struct sierra_port_private { spinlock_t lock; /* lock the structure */ int outstanding_urbs; /* number of out urbs in flight */ + struct usb_anchor active; + struct usb_anchor delayed; /* Input endpoints and buffers for this port */ struct urb *in_urbs[N_IN_URB]; @@ -279,6 +296,8 @@ struct sierra_port_private { int dsr_state; int dcd_state; int ri_state; + + unsigned int opened:1; }; static int sierra_send_setup(struct usb_serial_port *port) @@ -390,21 +409,25 @@ static void sierra_outdat_callback(struct urb *urb) { struct usb_serial_port *port = urb->context; struct sierra_port_private *portdata = usb_get_serial_port_data(port); + struct sierra_intf_private *intfdata; int status = urb->status; - unsigned long flags; dev_dbg(&port->dev, "%s - port %d\n", __func__, port->number); + intfdata = port->serial->private; /* free up the transfer buffer, as usb_free_urb() does not do this */ kfree(urb->transfer_buffer); - + usb_autopm_put_interface_async(port->serial->interface); if (status) dev_dbg(&port->dev, "%s - nonzero write bulk status " "received: %d\n", __func__, status); - spin_lock_irqsave(&portdata->lock, flags); + spin_lock(&portdata->lock); --portdata->outstanding_urbs; - spin_unlock_irqrestore(&portdata->lock, flags); + spin_unlock(&portdata->lock); + spin_lock(&intfdata->susp_lock); + --intfdata->in_flight; + spin_unlock(&intfdata->susp_lock); usb_serial_port_softint(port); } @@ -414,6 +437,7 @@ static int sierra_write(struct tty_struct *tty, struct usb_serial_port *port, const unsigned char *buf, int count) { struct sierra_port_private *portdata = usb_get_serial_port_data(port); + struct sierra_intf_private *intfdata; struct usb_serial *serial = port->serial; unsigned long flags; unsigned char *buffer; @@ -426,9 +450,9 @@ static int sierra_write(struct tty_struct *tty, struct usb_serial_port *port, return 0; portdata = usb_get_serial_port_data(port); + intfdata = serial->private; dev_dbg(&port->dev, "%s: write (%zd bytes)\n", __func__, writesize); - spin_lock_irqsave(&portdata->lock, flags); dev_dbg(&port->dev, "%s - outstanding_urbs: %d\n", __func__, portdata->outstanding_urbs); @@ -442,6 +466,14 @@ static int sierra_write(struct tty_struct *tty, struct usb_serial_port *port, portdata->outstanding_urbs); spin_unlock_irqrestore(&portdata->lock, flags); + retval = usb_autopm_get_interface_async(serial->interface); + if (retval < 0) { + spin_lock_irqsave(&portdata->lock, flags); + portdata->outstanding_urbs--; + spin_unlock_irqrestore(&portdata->lock, flags); + goto error_simple; + } + buffer = kmalloc(writesize, GFP_ATOMIC); if (!buffer) { dev_err(&port->dev, "out of memory\n"); @@ -468,14 +500,29 @@ static int sierra_write(struct tty_struct *tty, struct usb_serial_port *port, /* Handle the need to send a zero length packet */ urb->transfer_flags |= URB_ZERO_PACKET; + spin_lock_irqsave(&intfdata->susp_lock, flags); + + if (intfdata->suspended) { + usb_anchor_urb(urb, &portdata->delayed); + spin_unlock_irqrestore(&intfdata->susp_lock, flags); + goto skip_power; + } else { + usb_anchor_urb(urb, &portdata->active); + } /* send it down the pipe */ retval = usb_submit_urb(urb, GFP_ATOMIC); if (retval) { + usb_unanchor_urb(urb); + spin_unlock_irqrestore(&intfdata->susp_lock, flags); dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed " "with status = %d\n", __func__, retval); goto error; + } else { + intfdata->in_flight++; + spin_unlock_irqrestore(&intfdata->susp_lock, flags); } +skip_power: /* we are done with this urb, so let the host driver * really free it when it is finished with it */ usb_free_urb(urb); @@ -491,6 +538,8 @@ error_no_buffer: dev_dbg(&port->dev, "%s - 2. outstanding_urbs: %d\n", __func__, portdata->outstanding_urbs); spin_unlock_irqrestore(&portdata->lock, flags); + usb_autopm_put_interface_async(serial->interface); +error_simple: return retval; } @@ -530,6 +579,7 @@ static void sierra_indat_callback(struct urb *urb) /* Resubmit urb so we continue receiving */ if (port->port.count && status != -ESHUTDOWN && status != -EPERM) { + usb_mark_last_busy(port->serial->dev); err = usb_submit_urb(urb, GFP_ATOMIC); if (err) dev_err(&port->dev, "resubmit read urb failed." @@ -591,6 +641,7 @@ static void sierra_instat_callback(struct urb *urb) /* Resubmit urb so we continue receiving IRQ data */ if (port->port.count && status != -ESHUTDOWN && status != -ENOENT) { + usb_mark_last_busy(serial->dev); urb->dev = serial->dev; err = usb_submit_urb(urb, GFP_ATOMIC); if (err) @@ -711,6 +762,8 @@ static void sierra_close(struct usb_serial_port *port) int i; struct usb_serial *serial = port->serial; struct sierra_port_private *portdata; + struct sierra_intf_private *intfdata = port->serial->private; + dev_dbg(&port->dev, "%s\n", __func__); portdata = usb_get_serial_port_data(port); @@ -723,6 +776,10 @@ static void sierra_close(struct usb_serial_port *port) if (!serial->disconnected) sierra_send_setup(port); mutex_unlock(&serial->disc_mutex); + spin_lock_irq(&intfdata->susp_lock); + portdata->opened = 0; + spin_unlock_irq(&intfdata->susp_lock); + /* Stop reading urbs */ sierra_stop_rx_urbs(port); @@ -731,6 +788,8 @@ static void sierra_close(struct usb_serial_port *port) sierra_release_urb(portdata->in_urbs[i]); portdata->in_urbs[i] = NULL; } + usb_autopm_get_interface(serial->interface); + serial->interface->needs_remote_wakeup = 0; } } @@ -738,6 +797,7 @@ static int sierra_open(struct tty_struct *tty, struct usb_serial_port *port) { struct sierra_port_private *portdata; struct usb_serial *serial = port->serial; + struct sierra_intf_private *intfdata = serial->private; int i; int err; int endpoint; @@ -771,6 +831,12 @@ static int sierra_open(struct tty_struct *tty, struct usb_serial_port *port) } sierra_send_setup(port); + serial->interface->needs_remote_wakeup = 1; + spin_lock_irq(&intfdata->susp_lock); + portdata->opened = 1; + spin_unlock_irq(&intfdata->susp_lock); + usb_autopm_put_interface(serial->interface); + return 0; } @@ -818,6 +884,8 @@ static int sierra_startup(struct usb_serial *serial) return -ENOMEM; } spin_lock_init(&portdata->lock); + init_usb_anchor(&portdata->active); + init_usb_anchor(&portdata->delayed); /* Set the port private data pointer */ usb_set_serial_port_data(port, portdata); } @@ -844,6 +912,88 @@ static void sierra_release(struct usb_serial *serial) } } +#ifdef CONFIG_PM +static void stop_read_write_urbs(struct usb_serial *serial) +{ + int i, j; + struct usb_serial_port *port; + struct sierra_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); + for (j = 0; j < N_IN_URB; j++) + usb_kill_urb(portdata->in_urbs[j]); + usb_kill_anchored_urbs(&portdata->active); + } +} + +static int sierra_suspend(struct usb_serial *serial, pm_message_t message) +{ + struct sierra_intf_private *intfdata; + int b; + + if (serial->dev->auto_pm) { + intfdata = serial->private; + spin_lock_irq(&intfdata->susp_lock); + b = intfdata->in_flight; + + if (b) { + spin_unlock_irq(&intfdata->susp_lock); + return -EBUSY; + } else { + intfdata->suspended = 1; + spin_unlock_irq(&intfdata->susp_lock); + } + } + stop_read_write_urbs(serial); + + return 0; +} + +static int sierra_resume(struct usb_serial *serial) +{ + struct usb_serial_port *port; + struct sierra_intf_private *intfdata = serial->private; + struct sierra_port_private *portdata; + struct urb *urb; + int ec = 0; + int i, err; + + spin_lock_irq(&intfdata->susp_lock); + for (i = 0; i < serial->num_ports; i++) { + port = serial->port[i]; + portdata = usb_get_serial_port_data(port); + + while ((urb = usb_get_from_anchor(&portdata->delayed))) { + usb_anchor_urb(urb, &portdata->active); + intfdata->in_flight++; + err = usb_submit_urb(urb, GFP_ATOMIC); + if (err < 0) { + intfdata->in_flight--; + usb_unanchor_urb(urb); + usb_scuttle_anchored_urbs(&portdata->delayed); + break; + } + } + + if (portdata->opened) { + err = sierra_submit_rx_urbs(port, GFP_ATOMIC); + if (err) + ec++; + } + } + intfdata->suspended = 0; + spin_unlock_irq(&intfdata->susp_lock); + + return ec ? -EIO : 0; +} +#else +#define sierra_suspend NULL +#define sierra_resume NULL +#endif + static struct usb_serial_driver sierra_device = { .driver = { .owner = THIS_MODULE, @@ -864,6 +1014,8 @@ static struct usb_serial_driver sierra_device = { .tiocmset = sierra_tiocmset, .attach = sierra_startup, .release = sierra_release, + .suspend = sierra_suspend, + .resume = sierra_resume, .read_int_callback = sierra_instat_callback, }; |
