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authorClemens Ladisch <clemens@ladisch.de>2008-04-07 10:23:37 +0200
committerTakashi Iwai <tiwai@suse.de>2008-04-24 12:00:31 +0200
commit10e6d5f9b6edd4a12d678716d7fdb94278a83227 (patch)
tree710a7e4d1ed50ec72f441b5e809132c40e77f7ca /sound/pci/oxygen/oxygen_io.c
parent7a4356747298d1c899a12a25260d5ff1b4feeb5e (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.c23
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);