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HID: Add device group to modalias

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HID devices are only partially presented to userland.  Hotplugged
devices emit events containing a modalias based on the basic bus,
vendor and product entities. However, in practise a hid device can
depend on details such as a single usb interface or a particular item
in a report descriptor.

This patch adds a device group to the hid device id, and broadcasts it
using uevent and the device modalias.  The module alias generation is
modified to match. As a consequence, a device with a non-zero group
will be processed by the corresponding group driver instead of by the
generic hid driver.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Acked-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Henrik Rydberg 2012-04-23 12:07:02 +02:00 • committed by Jiri Kosina
parent a7197c2e41
commit 4d53b8012f
4 changed files with 27 additions and 3 deletions
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1
include/linux/hid.h
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@ -476,6 +476,7 @@ struct hid_device { /* device report descriptor */
unsigned maxcollection; /* Number of parsed collections */
unsigned maxapplication; /* Number of applications */
__u16 bus; /* BUS ID */
__u16 group; /* Report group */
__u32 vendor; /* Vendor ID */
__u32 product; /* Product ID */
__u32 version; /* HID version */