[ALSA] oxygen: add I2C support

[firefly-linux-kernel-4.4.55.git] / sound / pci / oxygen / oxygen_io.c

diff --git a/sound/pci/oxygen/oxygen_io.c b/sound/pci/oxygen/oxygen_io.c
index 74e23ef9c9467aaf3a54bacb2beb7315a4d36ea8..5569606ee87ff22bfb0ac9b9a15e9635e7bd4ed4 100644 (file)
--- 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);