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HID: waltop: Extend barrel button fix 

Extend Waltop barrel button fix to all models: ignore reported pressure when a
barrel button is pressed, because it is rarely correct. Report zero pressure in
such cases instead.

Signed-off-by: Nikolai Kondrashov <spbnick@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Nikolai Kondrashov 2012-05-20 21:23:36 +03:00 committed by Jiri Kosina
parent d2ee4dd9a4
commit ed13794925
1 changed files with 7 additions and 38 deletions
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45
drivers/hid/hid-waltop.c
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@ -638,28 +638,10 @@ static __u8 sirius_battery_free_tablet_rdesc_fixed[] = {
0xC0 /* End Collection */
};
struct waltop_state {
u8 pressure0;
u8 pressure1;
};
static int waltop_probe(struct hid_device *hdev,
const struct hid_device_id *id)
{
int ret;
struct waltop_state *s;
s = kzalloc(sizeof(*s), GFP_KERNEL);
if (s == NULL) {
hid_err(hdev, "can't allocate device state\n");
ret = -ENOMEM;
goto err;
}
s->pressure0 = 0;
s->pressure1 = 0;
hid_set_drvdata(hdev, s);
ret = hid_parse(hdev);
if (ret) {
@ -675,7 +657,6 @@ static int waltop_probe(struct hid_device *hdev,
return 0;
err:
kfree(s);
return ret;
}
@ -732,27 +713,18 @@ static __u8 *waltop_report_fixup(struct hid_device *hdev, __u8 *rdesc,
static int waltop_raw_event(struct hid_device *hdev, struct hid_report *report,
u8 *data, int size)
{
/* If this is a pen input report of a tablet with PID 0038 */
if (hdev->product == USB_DEVICE_ID_WALTOP_PID_0038 &&
report->type == HID_INPUT_REPORT &&
report->id == 16 &&
size == 8) {
struct waltop_state *s = hid_get_drvdata(hdev);
/* If this is a pen input report */
if (report->type == HID_INPUT_REPORT && report->id == 16 && size >= 8) {
/*
* Ignore maximum pressure reported when a barrel button is
* pressed.
* Ignore reported pressure when a barrel button is pressed,
* because it is rarely correct.
*/
/* If a barrel button is pressed */
if ((data[1] & 0xF) > 1) {
/* Use the last known pressure */
data[6] = s->pressure0;
data[7] = s->pressure1;
} else {
/* Remember reported pressure */
s->pressure0 = data[6];
s->pressure1 = data[7];
/* Report zero pressure */
data[6] = 0;
data[7] = 0;
}
}
@ -806,10 +778,7 @@ static int waltop_raw_event(struct hid_device *hdev, struct hid_report *report,
static void waltop_remove(struct hid_device *hdev)
{
struct waltop_state *s = hid_get_drvdata(hdev);
hid_hw_stop(hdev);
kfree(s);
}
static const struct hid_device_id waltop_devices[] = {