HID: wacom: Status luminance properties should set brightness of all LEDs

The wacom driver has (deprecated) sysfs properties `status0_luminance`
and `status1_luminance` that are used to control the low- and high-
level brightness values (llv and hlv) of the status LEDs. These two
properties had an effect on /all/ of the status LEDs.

After our driver switched to exposing each status LED individually
through the LED class, this behavior changed. These controls started
having only a temporary effect on the currently-lit LED. If a trigger
changed the current LED, the driver would switch the brightness back
to the llv/hlv values stored per-LED. (The code's current behavior of
updating the "global" e.g. `wacom->led.llv` values has essentially no
effect because those values are only used at initialization time).

This commit restores the original behavior by ensuring these properties
update the per-LED brightness for all LEDs.

Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>

diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
index 9652288c35712de2db223d2e222c2c6c07cd82f5..c1cde342018d2dd99dc8adf66c1f03dc7414a07b 100644 (file)
--- a/drivers/hid/wacom_sys.c
+++ b/drivers/hid/wacom_sys.c
@@ -1084,6 +1084,17 @@ static ssize_t wacom_luminance_store(struct wacom *wacom, u8 *dest,
        mutex_lock(&wacom->lock);
 
        *dest = value & 0x7f;
+       for (unsigned int i = 0; i < wacom->led.count; i++) {
+               struct wacom_group_leds *group = &wacom->led.groups[i];
+
+               for (unsigned int j = 0; j < group->count; j++) {
+                       if (dest == &wacom->led.llv)
+                               group->leds[j].llv = *dest;
+                       else if (dest == &wacom->led.hlv)
+                               group->leds[j].hlv = *dest;
+               }
+       }
+
        err = wacom_led_control(wacom);
 
        mutex_unlock(&wacom->lock);