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authorJason Gerecke <jason.gerecke@wacom.com>2020-04-02 00:23:29 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-05-14 08:57:20 +0300
commit525d7e73277b1d2388cdbf8e8a9177aa23ba2d7a (patch)
tree3b71a55da9ce0fe34ec10ead57daccf7eea021b1 /drivers/hid
parentf12aa513fe47e910bed3526e57ae1ce6c9412e24 (diff)
downloadlinux-525d7e73277b1d2388cdbf8e8a9177aa23ba2d7a.tar.xz
HID: wacom: Read HID_DG_CONTACTMAX directly for non-generic devices
commit 778fbf4179991e7652e97d7f1ca1f657ef828422 upstream. We've recently switched from extracting the value of HID_DG_CONTACTMAX at a fixed offset (which may not be correct for all tablets) to injecting the report into the driver for the generic codepath to handle. Unfortunately, this change was made for *all* tablets, even those which aren't generic. Because `wacom_wac_report` ignores reports from non- generic devices, the contact count never gets initialized. Ultimately this results in the touch device itself failing to probe, and thus the loss of touch input. This commit adds back the fixed-offset extraction for non-generic devices. Link: https://github.com/linuxwacom/input-wacom/issues/155 Fixes: 184eccd40389 ("HID: wacom: generic: read HID_DG_CONTACTMAX from any feature report") Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com> Reviewed-by: Aaron Armstrong Skomra <aaron.skomra@wacom.com> CC: stable@vger.kernel.org # 5.3+ Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Cc: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hid')
-rw-r--r--drivers/hid/wacom_sys.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
index 3038c975e417..8249ff3a5a8d 100644
--- a/drivers/hid/wacom_sys.c
+++ b/drivers/hid/wacom_sys.c
@@ -290,9 +290,11 @@ static void wacom_feature_mapping(struct hid_device *hdev,
data[0] = field->report->id;
ret = wacom_get_report(hdev, HID_FEATURE_REPORT,
data, n, WAC_CMD_RETRIES);
- if (ret == n) {
+ if (ret == n && features->type == HID_GENERIC) {
ret = hid_report_raw_event(hdev,
HID_FEATURE_REPORT, data, n, 0);
+ } else if (ret == 2 && features->type != HID_GENERIC) {
+ features->touch_max = data[1];
} else {
features->touch_max = 16;
hid_warn(hdev, "wacom_feature_mapping: "