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authorAaron Armstrong Skomra <skomra@gmail.com>2019-06-12 14:19:29 -0700
committerJiri Kosina <jkosina@suse.cz>2019-06-13 16:48:49 +0200
commit184eccd40389df29abefab88092c4ff33191fd0c (patch)
treefe9a41009e28c5f34f1d7864a96b0ff76c3132bf /drivers/hid/wacom_sys.c
parent912c6aa67ad4252dc92e6569cfcb32ee44575183 (diff)
HID: wacom: generic: read HID_DG_CONTACTMAX from any feature report
In the generic code path, HID_DG_CONTACTMAX was previously only read from the second byte of report 0x23. Another report (0x82) has the HID_DG_CONTACTMAX in the higher nibble of the third byte. We should support reading the value of HID_DG_CONTACTMAX no matter what report we are reading or which position that value is in. To do this we submit the feature report as a event report using hid_report_raw_event(). Our modified finger event path records the value of HID_DG_CONTACTMAX when it sees that usage. Fixes: 8ffffd5212846 ("HID: wacom: fix timeout on probe for some wacoms") Signed-off-by: Aaron Armstrong Skomra <aaron.skomra@wacom.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/wacom_sys.c')
-rw-r--r--drivers/hid/wacom_sys.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
index 2e3e03df83da..9ec895e5fd00 100644
--- a/drivers/hid/wacom_sys.c
+++ b/drivers/hid/wacom_sys.c
@@ -314,14 +314,16 @@ static void wacom_feature_mapping(struct hid_device *hdev,
/* leave touch_max as is if predefined */
if (!features->touch_max) {
/* read manually */
- data = kzalloc(2, GFP_KERNEL);
+ n = hid_report_len(field->report);
+ data = hid_alloc_report_buf(field->report, GFP_KERNEL);
if (!data)
break;
data[0] = field->report->id;
ret = wacom_get_report(hdev, HID_FEATURE_REPORT,
- data, 2, WAC_CMD_RETRIES);
- if (ret == 2) {
- features->touch_max = data[1];
+ data, n, WAC_CMD_RETRIES);
+ if (ret == n) {
+ ret = hid_report_raw_event(hdev,
+ HID_FEATURE_REPORT, data, n, 0);
} else {
features->touch_max = 16;
hid_warn(hdev, "wacom_feature_mapping: "