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USB: autosuspend for cdc-acm

Browse Source 
Here we go. This patch implements suspend/resume and autosuspend
for the CDC ACM driver.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Oliver Neukum 2007-10-12 17:24:28 +02:00 committed by Greg Kroah-Hartman
parent eedffd12e0
commit 1365baf724
2 changed files with 79 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

92
drivers/usb/class/cdc-acm.c
View File

@ -496,10 +496,19 @@ static int acm_tty_open(struct tty_struct *tty, struct file *filp)
otherwise it is scheduled, and with high data rates data can get lost. */
tty->low_latency = 1;
if (usb_autopm_get_interface(acm->control)) {
mutex_unlock(&open_mutex);
return -EIO;
}
mutex_lock(&acm->mutex);
mutex_unlock(&open_mutex);
if (acm->used++) {
usb_autopm_put_interface(acm->control);
goto done;
}
acm->ctrlurb->dev = acm->dev;
if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
dbg("usb_submit_urb(ctrl irq) failed");
@ -526,14 +535,15 @@ static int acm_tty_open(struct tty_struct *tty, struct file *filp)
done:
err_out:
mutex_unlock(&open_mutex);
mutex_unlock(&acm->mutex);
return rv;
full_bailout:
usb_kill_urb(acm->ctrlurb);
bail_out:
usb_autopm_put_interface(acm->control);
acm->used--;
mutex_unlock(&open_mutex);
mutex_unlock(&acm->mutex);
return -EIO;
}
@ -570,6 +580,7 @@ static void acm_tty_close(struct tty_struct *tty, struct file *filp)
usb_kill_urb(acm->writeurb);
for (i = 0; i < nr; i++)
usb_kill_urb(acm->ru[i].urb);
usb_autopm_put_interface(acm->control);
} else
acm_tty_unregister(acm);
}
@ -980,6 +991,7 @@ static int acm_probe (struct usb_interface *intf,
spin_lock_init(&acm->throttle_lock);
spin_lock_init(&acm->write_lock);
spin_lock_init(&acm->read_lock);
mutex_init(&acm->mutex);
acm->write_ready = 1;
acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
@ -1096,6 +1108,25 @@ static int acm_probe (struct usb_interface *intf,
return -ENOMEM;
}
static void stop_data_traffic(struct acm *acm)
{
int i;
tasklet_disable(&acm->urb_task);
usb_kill_urb(acm->ctrlurb);
usb_kill_urb(acm->writeurb);
for (i = 0; i < acm->rx_buflimit; i++)
usb_kill_urb(acm->ru[i].urb);
INIT_LIST_HEAD(&acm->filled_read_bufs);
INIT_LIST_HEAD(&acm->spare_read_bufs);
tasklet_enable(&acm->urb_task);
cancel_work_sync(&acm->work);
}
static void acm_disconnect(struct usb_interface *intf)
{
struct acm *acm = usb_get_intfdata(intf);
@ -1123,19 +1154,7 @@ static void acm_disconnect(struct usb_interface *intf)
usb_set_intfdata(acm->control, NULL);
usb_set_intfdata(acm->data, NULL);
tasklet_disable(&acm->urb_task);
usb_kill_urb(acm->ctrlurb);
usb_kill_urb(acm->writeurb);
for (i = 0; i < acm->rx_buflimit; i++)
usb_kill_urb(acm->ru[i].urb);
INIT_LIST_HEAD(&acm->filled_read_bufs);
INIT_LIST_HEAD(&acm->spare_read_bufs);
tasklet_enable(&acm->urb_task);
flush_scheduled_work(); /* wait for acm_softint */
stop_data_traffic(acm);
acm_write_buffers_free(acm);
usb_buffer_free(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
@ -1156,6 +1175,46 @@ static void acm_disconnect(struct usb_interface *intf)
tty_hangup(acm->tty);
}
static int acm_suspend(struct usb_interface *intf, pm_message_t message)
{
struct acm *acm = usb_get_intfdata(intf);
if (acm->susp_count++)
return 0;
/*
we treat opened interfaces differently,
we must guard against open
*/
mutex_lock(&acm->mutex);
if (acm->used)
stop_data_traffic(acm);
mutex_unlock(&acm->mutex);
return 0;
}
static int acm_resume(struct usb_interface *intf)
{
struct acm *acm = usb_get_intfdata(intf);
int rv = 0;
if (--acm->susp_count)
return 0;
mutex_lock(&acm->mutex);
if (acm->used) {
rv = usb_submit_urb(acm->ctrlurb, GFP_NOIO);
if (rv < 0)
goto err_out;
tasklet_schedule(&acm->urb_task);
}
err_out:
mutex_unlock(&acm->mutex);
return rv;
}
/*
* USB driver structure.
*/
@ -1208,7 +1267,10 @@ static struct usb_driver acm_driver = {
.name = "cdc_acm",
.probe = acm_probe,
.disconnect = acm_disconnect,
.suspend = acm_suspend,
.resume = acm_resume,
.id_table = acm_ids,
.supports_autosuspend = 1,
};
/*

2
drivers/usb/class/cdc-acm.h
View File

@ -107,6 +107,7 @@ struct acm {
int write_used; /* number of non-empty write buffers */
int write_ready; /* write urb is not running */
spinlock_t write_lock;
struct mutex mutex;
struct usb_cdc_line_coding line; /* bits, stop, parity */
struct work_struct work; /* work queue entry for line discipline waking up */
struct tasklet_struct urb_task; /* rx processing */
@ -120,6 +121,7 @@ struct acm {
unsigned char throttle; /* throttled by tty layer */
unsigned char clocal; /* termios CLOCAL */
unsigned int ctrl_caps; /* control capabilities from the class specific header */
unsigned int susp_count; /* number of suspended interfaces */
};
#define CDC_DATA_INTERFACE_TYPE 0x0a