HID: wacom: Provide battery charge state to system over USB if available
If a wireless adapter (which contains the charging circuitry) is
detected as being attached to the tablet then create a new battery
interface and update its status as data is reported. Also destroy the
battery if the adapter goes away.
Signed-off-by: Jason Gerecke <killertofu@gmail.com>
Acked-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c
index 5d57fec..f1e53f1 100644
--- a/drivers/hid/wacom_wac.c
+++ b/drivers/hid/wacom_wac.c
@@ -1952,6 +1952,7 @@
static int wacom_status_irq(struct wacom_wac *wacom_wac, size_t len)
{
+ struct wacom *wacom = container_of(wacom_wac, struct wacom, wacom_wac);
struct wacom_features *features = &wacom_wac->features;
unsigned char *data = wacom_wac->data;
@@ -1965,6 +1966,30 @@
SW_MUTE_DEVICE, data[8] & 0x40);
input_sync(wacom_wac->shared->touch_input);
}
+
+ if (data[9] & 0x02) { /* wireless module is attached */
+ int battery = (data[8] & 0x3f) * 100 / 31;
+ bool ps_connected = !!(data[8] & 0x80);
+ bool charging = ps_connected &&
+ wacom_wac->battery_capacity < 100;
+
+ wacom_notify_battery(wacom_wac, battery, charging,
+ ps_connected);
+
+ if (!wacom->battery.dev &&
+ !(features->quirks & WACOM_QUIRK_BATTERY)) {
+ features->quirks |= WACOM_QUIRK_BATTERY;
+ INIT_WORK(&wacom->work, wacom_battery_work);
+ wacom_schedule_work(wacom_wac);
+ }
+ }
+ else if ((features->quirks & WACOM_QUIRK_BATTERY) &&
+ wacom->battery.dev) {
+ features->quirks &= ~WACOM_QUIRK_BATTERY;
+ INIT_WORK(&wacom->work, wacom_battery_work);
+ wacom_schedule_work(wacom_wac);
+ wacom_notify_battery(wacom_wac, 0, 0, 0);
+ }
return 0;
}