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authorLaurent Pinchart <laurent.pinchart@skynet.be>2008-08-22 17:25:10 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2008-10-12 09:36:53 -0200
commit9b0ae867a6fd3035e97e6c33bc07a5bfd7c0f96c (patch)
treef9acf89578b607a93fe0dda274848d0c0df3e422 /drivers/media
parent14d962602c8bf86e63c9b9272be1f0360d0a448a (diff)
V4L/DVB (8754): uvcvideo: Implement the USB power management reset_resume method.
When a suspended device has been reset instead of being resumed, USB core calls the reset_resume method if available instead of unbinding and rebinding the device. This patch implements reset_resume by reusing the current resume implementation and simplifies the resume method by skipping the controls restore stage. Resuming from autosuspend should be faster. Signed-off-by: Laurent Pinchart <laurent.pinchart@skynet.be> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/video/uvc/uvc_driver.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/media/video/uvc/uvc_driver.c b/drivers/media/video/uvc/uvc_driver.c
index 7e102034d38..4a2d09988fa 100644
--- a/drivers/media/video/uvc/uvc_driver.c
+++ b/drivers/media/video/uvc/uvc_driver.c
@@ -1663,7 +1663,7 @@ static int uvc_suspend(struct usb_interface *intf, pm_message_t message)
return uvc_video_suspend(&dev->video);
}
-static int uvc_resume(struct usb_interface *intf)
+static int __uvc_resume(struct usb_interface *intf, int reset)
{
struct uvc_device *dev = usb_get_intfdata(intf);
int ret;
@@ -1672,7 +1672,7 @@ static int uvc_resume(struct usb_interface *intf)
intf->cur_altsetting->desc.bInterfaceNumber);
if (intf->cur_altsetting->desc.bInterfaceSubClass == SC_VIDEOCONTROL) {
- if ((ret = uvc_ctrl_resume_device(dev)) < 0)
+ if (reset && (ret = uvc_ctrl_resume_device(dev)) < 0)
return ret;
return uvc_status_resume(dev);
@@ -1687,6 +1687,16 @@ static int uvc_resume(struct usb_interface *intf)
return uvc_video_resume(&dev->video);
}
+static int uvc_resume(struct usb_interface *intf)
+{
+ return __uvc_resume(intf, 0);
+}
+
+static int uvc_reset_resume(struct usb_interface *intf)
+{
+ return __uvc_resume(intf, 1);
+}
+
/* ------------------------------------------------------------------------
* Driver initialization and cleanup
*/
@@ -1952,6 +1962,7 @@ struct uvc_driver uvc_driver = {
.disconnect = uvc_disconnect,
.suspend = uvc_suspend,
.resume = uvc_resume,
+ .reset_resume = uvc_reset_resume,
.id_table = uvc_ids,
.supports_autosuspend = 1,
},