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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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2
scripts/mod/file2alias.c
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@ -336,10 +336,12 @@ static int do_hid_entry(const char *filename,
struct hid_device_id *id, char *alias)
{
id->bus = TO_NATIVE(id->bus);
id->group = TO_NATIVE(id->group);
id->vendor = TO_NATIVE(id->vendor);
id->product = TO_NATIVE(id->product);
sprintf(alias, "hid:b%04X", id->bus);
ADD(alias, "g", id->group != HID_GROUP_ANY, id->group);
ADD(alias, "v", id->vendor != HID_ANY_ID, id->vendor);
ADD(alias, "p", id->product != HID_ANY_ID, id->product);