This is a note to let you know that I've just added the patch titled
HID: wacom: fix timeout on probe for some wacoms
to the 3.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
hid-wacom-fix-timeout-on-probe-for-some-wacoms.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8ffffd5212846b72f116f7a9572e83d580e25802 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
Date: Tue, 16 Sep 2014 16:56:39 -0400
Subject: HID: wacom: fix timeout on probe for some wacoms
From: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
commit 8ffffd5212846b72f116f7a9572e83d580e25802 upstream.
Some Wacom tablets (at least the ISDv4 found in the Lenovo X230) timeout
during probe while retrieving the input reports.
The only time this information is valuable is during the feature_mapping
stage, so we can ask for it there and discard the generic input reports
retrieval.
This gives a code path closer to the wacom.ko driver when it was in the
input subtree (not HID).
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
Signed-off-by: Jiri Kosina <jkosina@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/hid/wacom_sys.c | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)
--- a/drivers/hid/wacom_sys.c
+++ b/drivers/hid/wacom_sys.c
@@ -106,12 +106,24 @@ static void wacom_feature_mapping(struct
{
struct wacom *wacom = hid_get_drvdata(hdev);
struct wacom_features *features = &wacom->wacom_wac.features;
+ u8 *data;
+ int ret;
switch (usage->hid) {
case HID_DG_CONTACTMAX:
/* leave touch_max as is if predefined */
- if (!features->touch_max)
- features->touch_max = field->value[0];
+ if (!features->touch_max) {
+ /* read manually */
+ data = kzalloc(2, GFP_KERNEL);
+ if (!data)
+ break;
+ data[0] = field->report->id;
+ ret = wacom_get_report(hdev, HID_FEATURE_REPORT,
+ data, 2, 0);
+ if (ret == 2)
+ features->touch_max = data[1];
+ kfree(data);
+ }
break;
}
}
@@ -1245,6 +1257,8 @@ static int wacom_probe(struct hid_device
if (!id->driver_data)
return -EINVAL;
+ hdev->quirks |= HID_QUIRK_NO_INIT_REPORTS;
+
wacom = kzalloc(sizeof(struct wacom), GFP_KERNEL);
if (!wacom)
return -ENOMEM;
Patches currently in stable-queue which might be from benjamin.tissoires@xxxxxxxxxx are
queue-3.17/hid-wacom-fix-timeout-on-probe-for-some-wacoms.patch
queue-3.17/hid-rmi-check-sanity-of-the-incoming-report.patch
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