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V4L/DVB (7189): autosuspend support 

Together with Oliver Neukum from Novell, USB autosuspend support was added.

Signed-off-by: Tobias Lorenz <tobias.lorenz@gmx.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Tobias Lorenz 2008-02-09 16:08:24 -03:00 committed by Mauro Carvalho Chehab
parent 5caf51342c
commit 57566ad2d8
1 changed files with 75 additions and 8 deletions
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83
drivers/media/radio/radio-si470x.c
View File

@ -81,6 +81,10 @@
* - racy interruptible_sleep_on(),
* replaced with wait_event_interruptible()
* - handle signals in read()
* 2008-02-08 Tobias Lorenz <tobias.lorenz@gmx.net>
* Oliver Neukum <oliver@neukum.org>
* Version 1.0.7
* - usb autosuspend support
*
* ToDo:
* - add seeking support
@ -415,6 +419,7 @@ MODULE_PARM_DESC(rds_poll_time, "RDS poll time (ms): *40*");
struct si470x_device {
/* reference to USB and video device */
struct usb_device *usbdev;
struct usb_interface *intf;
struct video_device *videodev;
/* driver management */
@ -762,9 +767,17 @@ static int si470x_stop(struct si470x_device *radio)
*/
static int si470x_rds_on(struct si470x_device *radio)
{
int retval;
/* sysconfig 1 */
mutex_lock(&radio->lock);
radio->registers[SYSCONFIG1] |= SYSCONFIG1_RDS;
return si470x_set_register(radio, SYSCONFIG1);
retval = si470x_set_register(radio, SYSCONFIG1);
if (retval < 0)
radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS;
mutex_unlock(&radio->lock);
return retval;
}
@ -961,10 +974,22 @@ static unsigned int si470x_fops_poll(struct file *file,
static int si470x_fops_open(struct inode *inode, struct file *file)
{
struct si470x_device *radio = video_get_drvdata(video_devdata(file));
int retval;
radio->users++;
if (radio->users == 1)
return si470x_start(radio);
retval = usb_autopm_get_interface(radio->intf);
if (retval < 0) {
radio->users--;
return -EIO;
}
if (radio->users == 1) {
retval = si470x_start(radio);
if (retval < 0)
usb_autopm_put_interface(radio->intf);
return retval;
}
return 0;
}
@ -976,6 +1001,7 @@ static int si470x_fops_open(struct inode *inode, struct file *file)
static int si470x_fops_release(struct inode *inode, struct file *file)
{
struct si470x_device *radio = video_get_drvdata(video_devdata(file));
int retval;
if (!radio)
return -ENODEV;
@ -988,7 +1014,9 @@ static int si470x_fops_release(struct inode *inode, struct file *file)
/* cancel read processes */
wake_up_interruptible(&radio->read_queue);
return si470x_stop(radio);
retval = si470x_stop(radio);
usb_autopm_put_interface(radio->intf);
return retval;
}
return 0;
@ -1377,6 +1405,7 @@ static int si470x_usb_driver_probe(struct usb_interface *intf,
sizeof(si470x_viddev_template));
radio->users = 0;
radio->usbdev = interface_to_usbdev(intf);
radio->intf = intf;
mutex_init(&radio->lock);
video_set_drvdata(radio->videodev, radio);
@ -1439,6 +1468,41 @@ static int si470x_usb_driver_probe(struct usb_interface *intf,
}
/*
* si470x_usb_driver_suspend - suspend the device
*/
static int si470x_usb_driver_suspend(struct usb_interface *intf,
pm_message_t message)
{
struct si470x_device *radio = usb_get_intfdata(intf);
printk(KERN_INFO DRIVER_NAME ": suspending now...\n");
cancel_delayed_work_sync(&radio->work);
return 0;
}
/*
* si470x_usb_driver_resume - resume the device
*/
static int si470x_usb_driver_resume(struct usb_interface *intf)
{
struct si470x_device *radio = usb_get_intfdata(intf);
printk(KERN_INFO DRIVER_NAME ": resuming now...\n");
mutex_lock(&radio->lock);
if (radio->users && radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS)
schedule_delayed_work(&radio->work,
msecs_to_jiffies(rds_poll_time));
mutex_unlock(&radio->lock);
return 0;
}
/*
* si470x_usb_driver_disconnect - disconnect the device
*/
@ -1458,10 +1522,13 @@ static void si470x_usb_driver_disconnect(struct usb_interface *intf)
* si470x_usb_driver - usb driver interface
*/
static struct usb_driver si470x_usb_driver = {
.name = DRIVER_NAME,
.probe = si470x_usb_driver_probe,
.disconnect = si470x_usb_driver_disconnect,
.id_table = si470x_usb_driver_id_table,
.name = DRIVER_NAME,
.probe = si470x_usb_driver_probe,
.disconnect = si470x_usb_driver_disconnect,
.suspend = si470x_usb_driver_suspend,
.resume = si470x_usb_driver_resume,
.id_table = si470x_usb_driver_id_table,
.supports_autosuspend = 1,
};