diff options
| author | Frank Schaefer <fschaefer.oss@googlemail.com> | 2013-12-01 18:06:56 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <m.chehab@samsung.com> | 2013-12-10 16:20:26 -0200 |
| commit | 6063d07785b7059d276cb1a39c76186804f5938e (patch) | |
| tree | 1ecd1c42394623e710ffda7d2d239363eb16edc7 /drivers/media/usb/em28xx/em28xx-core.c | |
| parent | 6b8a3170c9984be58e50e23c78e2eb7833f33c4c (diff) | |
[media] em28xx: add support for illumination button and LED
The SpeedLink VAD Laplace webcam is equipped with an illumination button and
an illumination LED. When the button is pressed, the driver must toggle the
LED state via the corresponding GPO port.
Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'drivers/media/usb/em28xx/em28xx-core.c')
| -rw-r--r-- | drivers/media/usb/em28xx/em28xx-core.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/media/usb/em28xx/em28xx-core.c b/drivers/media/usb/em28xx/em28xx-core.c index 4a8179aafc4d..fc8254035278 100644 --- a/drivers/media/usb/em28xx/em28xx-core.c +++ b/drivers/media/usb/em28xx/em28xx-core.c @@ -226,6 +226,25 @@ int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val, EXPORT_SYMBOL_GPL(em28xx_write_reg_bits); /* + * em28xx_toggle_reg_bits() + * toggles/inverts the bits (specified by bitmask) of a register + */ +int em28xx_toggle_reg_bits(struct em28xx *dev, u16 reg, u8 bitmask) +{ + int oldval; + u8 newval; + + oldval = em28xx_read_reg(dev, reg); + if (oldval < 0) + return oldval; + + newval = (~oldval & bitmask) | (oldval & ~bitmask); + + return em28xx_write_reg(dev, reg, newval); +} +EXPORT_SYMBOL_GPL(em28xx_toggle_reg_bits); + +/* * em28xx_is_ac97_ready() * Checks if ac97 is ready */ |