[PATCH 5.4 011/389] HID: wacom: Dont register pad_input for touch switch

Greg Kroah-Hartman
2022-08-23T11:07:20Z

From: Ping Cheng <pinglinux@gmail.com>

commit d6b675687a4ab4dba684716d97c8c6f81bf10905 upstream.

Touch switch state is received through WACOM_PAD_FIELD. However, it
is reported by touch_input. Don't register pad_input if no other pad
events require the interface.

Cc: stable@vger.kernel.org
Signed-off-by: Ping Cheng <ping.cheng@wacom.com>
Reviewed-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/hid/wacom_sys.c | 2 +-
drivers/hid/wacom_wac.c | 43 +++++++++++++++++++++++++------------------
2 files changed, 26 insertions(+), 19 deletions(-)

--- a/drivers/hid/wacom_sys.c
+++ b/drivers/hid/wacom_sys.c
@@ -2124,7 +2124,7 @@ static int wacom_register_inputs(struct

error = wacom_setup_pad_input_capabilities(pad_input_dev, wacom_wac);
if (error) {
- /* no pad in use on this interface */
+ /* no pad events using this interface */
input_free_device(pad_input_dev);
wacom_wac->pad_input = NULL;
pad_input_dev = NULL;
--- a/drivers/hid/wacom_wac.c
+++ b/drivers/hid/wacom_wac.c
@@ -2016,7 +2016,6 @@ static void wacom_wac_pad_usage_mapping(
wacom_wac->has_mute_touch_switch = true;
usage->type = EV_SW;
usage->code = SW_MUTE_DEVICE;
- features->device_type |= WACOM_DEVICETYPE_PAD;
break;
case WACOM_HID_WD_TOUCHSTRIP:
wacom_map_usage(input, usage, field, EV_ABS, ABS_RX, 0);
@@ -2096,6 +2095,30 @@ static void wacom_wac_pad_event(struct h
wacom_wac->hid_data.inrange_state |= value;
}

+ /* Process touch switch state first since it is reported through touch interface,
+ * which is indepentent of pad interface. In the case when there are no other pad
+ * events, the pad interface will not even be created.
+ */
+ if ((equivalent_usage == WACOM_HID_WD_MUTE_DEVICE) ||
+ (equivalent_usage == WACOM_HID_WD_TOUCHONOFF)) {
+ if (wacom_wac->shared->touch_input) {
+ bool *is_touch_on = &wacom_wac->shared->is_touch_on;
+
+ if (equivalent_usage == WACOM_HID_WD_MUTE_DEVICE && value)
+ *is_touch_on = !(*is_touch_on);
+ else if (equivalent_usage == WACOM_HID_WD_TOUCHONOFF)
+ *is_touch_on = value;
+
+ input_report_switch(wacom_wac->shared->touch_input,
+ SW_MUTE_DEVICE, !(*is_touch_on));
+ input_sync(wacom_wac->shared->touch_input);
+ }
+ return;
+ }
+
+ if (!input)
+ return;
+
switch (equivalent_usage) {
case WACOM_HID_WD_TOUCHRING:
/*
@@ -2131,22 +2154,6 @@ static void wacom_wac_pad_event(struct h
input_event(input, usage->type, usage->code, 0);
break;

- case WACOM_HID_WD_MUTE_DEVICE:
- case WACOM_HID_WD_TOUCHONOFF:
- if (wacom_wac->shared->touch_input) {
- bool *is_touch_on = &wacom_wac->shared->is_touch_on;
-
- if (equivalent_usage == WACOM_HID_WD_MUTE_DEVICE && value)
- *is_touch_on = !(*is_touch_on);
- else if (equivalent_usage == WACOM_HID_WD_TOUCHONOFF)
- *is_touch_on = value;
-
- input_report_switch(wacom_wac->shared->touch_input,
- SW_MUTE_DEVICE, !(*is_touch_on));
- input_sync(wacom_wac->shared->touch_input);
- }
- break;
-
case WACOM_HID_WD_MODE_CHANGE:
if (wacom_wac->is_direct_mode != value) {
wacom_wac->is_direct_mode = value;
@@ -2776,7 +2783,7 @@ void wacom_wac_event(struct hid_device *
/* usage tests must precede field tests */
if (WACOM_BATTERY_USAGE(usage))
wacom_wac_battery_event(hdev, field, usage, value);
- else if (WACOM_PAD_FIELD(field) && wacom->wacom_wac.pad_input)
+ else if (WACOM_PAD_FIELD(field))
wacom_wac_pad_event(hdev, field, usage, value);
else if (WACOM_PEN_FIELD(field) && wacom->wacom_wac.pen_input)
wacom_wac_pen_event(hdev, field, usage, value);