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USB: Select better matching USB drivers when available

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Now that USB device drivers can reuse code from the generic USB device
driver, we need to make sure that they get selected rather than the
generic driver. Add an id_table and match vfunc to the usb_device_driver
struct, which will get used to select a better matching driver at
->probe time.

This is a similar mechanism to that used in the HID drivers, with the
generic driver being selected unless there's a better matching one found
in the registered drivers (see hid_generic_match() in
drivers/hid/hid-generic.c).

Signed-off-by: Bastien Nocera <hadess@hadess.net>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/20191016093933.693-5-hadess@hadess.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bastien Nocera
2019-10-16 11:39:31 +02:00
committed by Greg Kroah-Hartman
parent aeebf2b546
commit 88b7381a93
3 changed files with 44 additions and 2 deletions
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2
include/linux/usb.h
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@@ -1237,6 +1237,7 @@ struct usb_driver {
struct usb_device_driver {
const char *name;
bool (*match) (struct usb_device *udev);
int (*probe) (struct usb_device *udev);
void (*disconnect) (struct usb_device *udev);
@@ -1244,6 +1245,7 @@ struct usb_device_driver {
int (*resume) (struct usb_device *udev, pm_message_t message);
const struct attribute_group **dev_groups;
struct usbdrv_wrap drvwrap;
const struct usb_device_id *id_table;
unsigned int supports_autosuspend:1;
unsigned int generic_subclass:1;
};