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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>
This commit is contained in:
Jason Gerecke 2015-03-06 11:47:41 -08:00 committed by Jiri Kosina
parent fce9957d8f
commit 8f93b0b2b0
1 changed files with 25 additions and 0 deletions
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25
drivers/hid/wacom_wac.c
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@ -1952,6 +1952,7 @@ static int wacom_wireless_irq(struct wacom_wac *wacom, size_t len)
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 @@ static int wacom_status_irq(struct wacom_wac *wacom_wac, size_t len)
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;
}