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USB: add RESET_RESUME device quirk 

This patch (as888) adds a new USB device quirk for devices which are
unable to resume correctly.  By using the new code added for the
USB-persist facility, it is a simple matter to reset these devices
instead of resuming them.  To get things kicked off, a quirk entry is
added for the Philips PSC805.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2007-05-04 11:53:03 -04:00 committed by Greg Kroah-Hartman
parent 383975d765
commit 6bc6cff52e
4 changed files with 15 additions and 0 deletions
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4
drivers/usb/core/driver.c
View File

@ -24,6 +24,7 @@
#include <linux/device.h>
#include <linux/usb.h>
#include <linux/usb/quirks.h>
#include <linux/workqueue.h>
#include "hcd.h"
#include "usb.h"
@ -835,6 +836,9 @@ static int usb_resume_device(struct usb_device *udev)
goto done;
}
if (udev->quirks & USB_QUIRK_RESET_RESUME)
udev->reset_resume = 1;
udriver = to_usb_device_driver(udev->dev.driver);
status = udriver->resume(udev);

5
drivers/usb/core/hub.c
View File

@ -2939,6 +2939,11 @@ static int config_descriptors_changed(struct usb_device *udev)
* this from a driver probe() routine after downloading new firmware.
* For calls that might not occur during probe(), drivers should lock
* the device using usb_lock_device_for_reset().
*
* Locking exception: This routine may also be called from within an
* autoresume handler. Such usage won't conflict with other tasks
* holding the device lock because these tasks should always call
* usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
*/
int usb_reset_device(struct usb_device *udev)
{

3
drivers/usb/core/quirks.c
View File

@ -35,6 +35,9 @@ static const struct usb_device_id usb_quirk_list[] = {
/* Elsa MicroLink 56k (V.250) */
{ USB_DEVICE(0x05cc, 0x2267), .driver_info = USB_QUIRK_NO_AUTOSUSPEND },
/* Philips PSC805 audio device */
{ USB_DEVICE(0x0471, 0x0155), .driver_info = USB_QUIRK_RESET_RESUME },
{ } /* terminating entry must be last */
};

3
include/linux/usb/quirks.h
View File

@ -9,3 +9,6 @@
/* string descriptors must not be fetched using a 255-byte read */
#define USB_QUIRK_STRING_FETCH_255 0x00000002
/* device can't resume correctly so reset it instead */
#define USB_QUIRK_RESET_RESUME 0x00000004