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| author | Jason Gerecke <killertofu@gmail.com> | 2015-03-11 18:25:41 +0100 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2015-03-11 18:50:04 +0100 |
| commit | 71fa641ebbfd2402bdb76d3c6ba7e4a2d1eb2dfc (patch) | |
| tree | 98f85a9921254a670904652bdf10205a5b1a149a /drivers/hid/wacom_sys.c | |
| parent | HID: wacom: drop WACOM_PKGLEN_STATUS (diff) | |
| download | linux-71fa641ebbfd2402bdb76d3c6ba7e4a2d1eb2dfc.tar.xz linux-71fa641ebbfd2402bdb76d3c6ba7e4a2d1eb2dfc.zip | |
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: Jason Gerecke <killertofu@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/wacom_sys.c')
| -rw-r--r-- | drivers/hid/wacom_sys.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c index 955ce7ceda89..ab7bf84c1ca7 100644 --- a/drivers/hid/wacom_sys.c +++ b/drivers/hid/wacom_sys.c @@ -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; |