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[ALSA] oxygen: add I2C support

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Add a function to write I2C registers.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Clemens Ladisch 2008-04-07 10:23:37 +02:00 committed by Takashi Iwai
parent 7a43567472
commit 10e6d5f9b6
2 changed files with 22 additions and 2 deletions
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1
sound/pci/oxygen/oxygen.h
View File

@ -146,6 +146,7 @@ void oxygen_write_ac97_masked(struct oxygen *chip, unsigned int codec,
unsigned int index, u16 data, u16 mask);
void oxygen_write_spi(struct oxygen *chip, u8 control, unsigned int data);
void oxygen_write_i2c(struct oxygen *chip, u8 device, u8 map, u8 data);
static inline void oxygen_set_bits8(struct oxygen *chip,
unsigned int reg, u8 value)

23
sound/pci/oxygen/oxygen_io.c
View File

@ -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);