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Commit 10e6d5f9 authored by Clemens Ladisch's avatar Clemens Ladisch Committed by Takashi Iwai
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[ALSA] oxygen: add I2C support 



Add a function to write I2C registers.

Signed-off-by: default avatarClemens Ladisch <clemens@ladisch.de>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 7a435674

sound/pci/oxygen/oxygen.h

+1 −0
Original line number Diff line number Diff line
@@ -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)

sound/pci/oxygen/oxygen_io.c

+21 −2
Original line number Diff line number Diff line
@@ -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);