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Commit 71fa641e authored by Jason Gerecke's avatar Jason Gerecke Committed by Jiri Kosina
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HID: wacom: Add battery presence indicator to wireless tablets 



Declare the POWER_SUPPLY_PROP_PRESENT property to provide userspace
with a way to determine if the battery on a wireless tablet is plugged
in. Although current wireless tablets do not explicitly report this
information, it can be inferred from other state information. In
particular, a battery is assumed to be present if any of the following
are true: a non-zero battery level reported, the battery is reported as
charging, or the tablet is operating wirelessly.

Note: The last condition above may not strictly hold for the Graphire
Wireless (it charges from a DC barrel jack instead of a USB port), but I
do not know what is reported in the no-battery condition.

Signed-off-by: default avatarJason Gerecke <killertofu@gmail.com>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 8fac1722

drivers/hid/wacom_sys.c

+4 −0
Original line number Diff line number Diff line
@@ -945,6 +945,7 @@ static void wacom_destroy_leds(struct wacom *wacom) 
}



static enum power_supply_property wacom_battery_props[] = {

	POWER_SUPPLY_PROP_PRESENT,

	POWER_SUPPLY_PROP_STATUS,

	POWER_SUPPLY_PROP_SCOPE,

	POWER_SUPPLY_PROP_CAPACITY
@@ -964,6 +965,9 @@ static int wacom_battery_get_property(struct power_supply *psy, 
	int ret = 0;



	switch (psp) {

		case POWER_SUPPLY_PROP_PRESENT:

			val->intval = wacom->wacom_wac.bat_connected;

			break;

		case POWER_SUPPLY_PROP_SCOPE:

			val->intval = POWER_SUPPLY_SCOPE_DEVICE;

			break;

drivers/hid/wacom_wac.c

+10 −6
Original line number Diff line number Diff line
@@ -46,16 +46,19 @@ static unsigned short batcap_gr[8] = { 1, 15, 25, 35, 50, 70, 100, 100 }; 
static unsigned short batcap_i4[8] = { 1, 15, 30, 45, 60, 70, 85, 100 };



static void wacom_notify_battery(struct wacom_wac *wacom_wac,

	int bat_capacity, bool bat_charging, bool ps_connected)

	int bat_capacity, bool bat_charging, bool bat_connected,

	bool ps_connected)

{

	struct wacom *wacom = container_of(wacom_wac, struct wacom, wacom_wac);

	bool changed = wacom_wac->battery_capacity != bat_capacity  ||

		       wacom_wac->bat_charging     != bat_charging  ||

		       wacom_wac->bat_connected    != bat_connected ||

		       wacom_wac->ps_connected     != ps_connected;



	if (changed) {

		wacom_wac->battery_capacity = bat_capacity;

		wacom_wac->bat_charging = bat_charging;

		wacom_wac->bat_connected = bat_connected;

		wacom_wac->ps_connected = ps_connected;



		if (wacom->battery.dev)
@@ -438,7 +441,7 @@ static int wacom_graphire_irq(struct wacom_wac *wacom) 
		battery_capacity = batcap_gr[rw];

		ps_connected = rw == 7;

		wacom_notify_battery(wacom, battery_capacity, ps_connected,

				     ps_connected);

				     1, ps_connected);

	}

exit:

	return retval;
@@ -1029,6 +1032,7 @@ static int wacom_intuos_bt_irq(struct wacom_wac *wacom, size_t len) 
		ps_connected = (power_raw & 0x10) ? 1 : 0;

		battery_capacity = batcap_i4[power_raw & 0x07];

		wacom_notify_battery(wacom, battery_capacity, bat_charging,

				     battery_capacity || bat_charging,

				     ps_connected);

		break;

	default:
@@ -1936,13 +1940,13 @@ static int wacom_wireless_irq(struct wacom_wac *wacom, size_t len) 
		}



		if (wacom->shared->type)

			wacom_notify_battery(wacom, battery, charging, 0);

			wacom_notify_battery(wacom, battery, charging, 1, 0);



	} else if (wacom->pid != 0) {

		/* disconnected while previously connected */

		wacom->pid = 0;

		wacom_schedule_work(wacom);

		wacom_notify_battery(wacom, 0, 0, 0);

		wacom_notify_battery(wacom, 0, 0, 0, 0);

	}



	return 0;
@@ -1970,7 +1974,7 @@ static int wacom_status_irq(struct wacom_wac *wacom_wac, size_t len) 
		bool charging = !!(data[8] & 0x80);



		wacom_notify_battery(wacom_wac, battery, charging,

				     1);

				     battery || charging, 1);



		if (!wacom->battery.dev &&

		    !(features->quirks & WACOM_QUIRK_BATTERY)) {
@@ -1984,7 +1988,7 @@ static int wacom_status_irq(struct wacom_wac *wacom_wac, size_t len) 
		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);

		wacom_notify_battery(wacom_wac, 0, 0, 0, 0);

	}

	return 0;

}

drivers/hid/wacom_wac.h

+1 −0
Original line number Diff line number Diff line
@@ -212,6 +212,7 @@ struct wacom_wac { 
	int battery_capacity;

	int num_contacts_left;

	int bat_charging;

	int bat_connected;

	int ps_connected;

	u8 bt_features;

	u8 bt_high_speed;