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Input: wacom - put a flag when the led are initialized

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This solves a bug with the wireless receiver:
- at plug, the wireless receiver does not know which Wacom device it is
  connected to, so it does not actually creates all the LEDs
- when the tablet connects, wacom->wacom_wac.features.type is set to the
  proper device so that wacom_wac can understand the packets
- when the receiver is unplugged, it detects that a LED should have been
  created (based on wacom->wacom_wac.features.type) and tries to remove
  it: crash when removing the sysfs group.

Side effect, we can now safely call several times wacom_destroy_leds().

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Acked-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Benjamin Tissoires 2014-07-24 13:16:17 -07:00 committed by Dmitry Torokhov
parent 0b335cad73
commit c757cbafd6
2 changed files with 7 additions and 0 deletions
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1
drivers/hid/wacom.h
View file

@ -118,6 +118,7 @@ struct wacom {
u8 hlv; /* status led brightness button pressed (1..127) */
u8 img_lum; /* OLED matrix display brightness */
} led;
bool led_initialized;
struct power_supply battery;
};

6
drivers/hid/wacom_sys.c
View file

@ -729,12 +729,18 @@ static int wacom_initialize_leds(struct wacom *wacom)
return error;
}
wacom_led_control(wacom);
wacom->led_initialized = true;
return 0;
}
static void wacom_destroy_leds(struct wacom *wacom)
{
if (!wacom->led_initialized)
return;
wacom->led_initialized = false;
switch (wacom->wacom_wac.features.type) {
case INTUOS4S:
case INTUOS4: