leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

HID: magicmouse: ignore 'ivalid report id' while switching modes, v2

Browse Source 
This is basically a more generic respin of 23746a6 ("HID: magicmouse: ignore
'ivalid report id' while switching modes") which got reverted later by
c3a492.

It turns out that on some configurations, this is actually still the case
and we are not able to detect in runtime.

The device reponds with 'invalid report id' when feature report switching it
into multitouch mode is sent to it.

This has been silently ignored before 0825411ade ("HID: bt: Wait for ACK
on Sent Reports"), but since this commit, it propagates -EIO from the _raw
callback .

So let the driver ignore -EIO as response to 0xd7,0x01 report, as that's
how the device reacts in normal mode.

Sad, but following reality.

This fixes https://bugzilla.kernel.org/show_bug.cgi?id=35022

Reported-by: Chase Douglas <chase.douglas@canonical.com>
Reported-by: Jaikumar Ganesh <jaikumarg@android.com>
Tested-by: Chase Douglas <chase.douglas@canonical.com>
Tested-by: Jaikumar Ganesh <jaikumarg@android.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Jiri Kosina 2011-08-25 14:21:37 +02:00
parent 4f6fdf0868
commit 35d851df23
1 changed files with 9 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/hid/hid-magicmouse.c
View File

@ -537,9 +537,17 @@ static int magicmouse_probe(struct hid_device *hdev,
}
report->size = 6;
/*
* Some devices repond with 'invalid report id' when feature
* report switching it into multitouch mode is sent to it.
*
* This results in -EIO from the _raw low-level transport callback,
* but there seems to be no other way of switching the mode.
* Thus the super-ugly hacky success check below.
*/
ret = hdev->hid_output_raw_report(hdev, feature, sizeof(feature),
HID_FEATURE_REPORT);
if (ret != sizeof(feature)) {
if (ret != -EIO && ret != sizeof(feature)) {
hid_err(hdev, "unable to request touch data (%d)\n", ret);
goto err_stop_hw;
}