diff options
Diffstat (limited to 'drivers/media/usb/stk1160/stk1160-ac97.c')
| -rw-r--r-- | drivers/media/usb/stk1160/stk1160-ac97.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/media/usb/stk1160/stk1160-ac97.c b/drivers/media/usb/stk1160/stk1160-ac97.c index 502fc8ee9a97..5e9b76edd81c 100644 --- a/drivers/media/usb/stk1160/stk1160-ac97.c +++ b/drivers/media/usb/stk1160/stk1160-ac97.c @@ -91,8 +91,34 @@ void stk1160_ac97_dump_regs(struct stk1160 *dev) } #endif +int stk1160_has_audio(struct stk1160 *dev) +{ + u8 value; + + stk1160_read_reg(dev, STK1160_POSV_L, &value); + return !(value & STK1160_POSV_L_ACDOUT); +} + +int stk1160_has_ac97(struct stk1160 *dev) +{ + u8 value; + + stk1160_read_reg(dev, STK1160_POSV_L, &value); + return !(value & STK1160_POSV_L_ACSYNC); +} + void stk1160_ac97_setup(struct stk1160 *dev) { + if (!stk1160_has_audio(dev)) { + stk1160_info("Device doesn't support audio, skipping AC97 setup."); + return; + } + + if (!stk1160_has_ac97(dev)) { + stk1160_info("Device uses internal 8-bit ADC, skipping AC97 setup."); + return; + } + /* Two-step reset AC97 interface and hardware codec */ stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x94); stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x8c); |