diff options
| author | Clemens Ladisch <clemens@ladisch.de> | 2008-04-07 10:23:37 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2008-04-24 12:00:31 +0200 |
| commit | 10e6d5f9b6edd4a12d678716d7fdb94278a83227 (patch) | |
| tree | 710a7e4d1ed50ec72f441b5e809132c40e77f7ca /sound/pci/oxygen/oxygen_io.c | |
| parent | 7a4356747298d1c899a12a25260d5ff1b4feeb5e (diff) | |
[ALSA] oxygen: add I2C support
Add a function to write I2C registers.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/pci/oxygen/oxygen_io.c')
| -rw-r--r-- | sound/pci/oxygen/oxygen_io.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/sound/pci/oxygen/oxygen_io.c b/sound/pci/oxygen/oxygen_io.c index 74e23ef9c946..5569606ee87f 100644 --- a/sound/pci/oxygen/oxygen_io.c +++ b/sound/pci/oxygen/oxygen_io.c @@ -190,12 +190,31 @@ void oxygen_write_spi(struct oxygen *chip, u8 control, unsigned int data) --count; } - spin_lock_irq(&chip->reg_lock); oxygen_write8(chip, OXYGEN_SPI_DATA1, data); oxygen_write8(chip, OXYGEN_SPI_DATA2, data >> 8); if (control & OXYGEN_SPI_DATA_LENGTH_3) oxygen_write8(chip, OXYGEN_SPI_DATA3, data >> 16); oxygen_write8(chip, OXYGEN_SPI_CONTROL, control); - spin_unlock_irq(&chip->reg_lock); } EXPORT_SYMBOL(oxygen_write_spi); + +void oxygen_write_i2c(struct oxygen *chip, u8 device, u8 map, u8 data) +{ + unsigned long timeout; + + /* should not need more than about 300 us */ + timeout = jiffies + msecs_to_jiffies(1); + do { + if (!(oxygen_read16(chip, OXYGEN_2WIRE_BUS_STATUS) + & OXYGEN_2WIRE_BUSY)) + break; + udelay(1); + cond_resched(); + } while (time_after_eq(timeout, jiffies)); + + oxygen_write8(chip, OXYGEN_2WIRE_MAP, map); + oxygen_write8(chip, OXYGEN_2WIRE_DATA, data); + oxygen_write8(chip, OXYGEN_2WIRE_CONTROL, + device | OXYGEN_2WIRE_DIR_WRITE); +} +EXPORT_SYMBOL(oxygen_write_i2c); |