ALSA: virtuoso: allow I2C-connected PCM1796

Add support for PCM1796 chips that are connected with an I2C bus instead
of SPI.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

diff --git a/sound/pci/oxygen/virtuoso.c b/sound/pci/oxygen/virtuoso.c
index 8f65aa8..853e889 100644 (file)
--- a/sound/pci/oxygen/virtuoso.c
+++ b/sound/pci/oxygen/virtuoso.c
@@ -124,6 +124,7 @@ MODULE_DEVICE_TABLE(pci, xonar_ids);
 #define GPIO_DX_FRONT_PANEL    0x0002
 #define GPIO_DX_INPUT_ROUTE    0x0100
 
+#define I2C_DEVICE_PCM1796(i)  (0x98 + ((i) << 1))     /* 10011, ADx=i, /W=0 */
 #define I2C_DEVICE_CS4398      0x9e    /* 10011, AD1=1, AD0=1, /W=0 */
 #define I2C_DEVICE_CS4362A     0x30    /* 001100, AD0=0, /W=0 */
 
@@ -142,8 +143,8 @@ struct xonar_data {
 
 static void xonar_gpio_changed(struct oxygen *chip);
 
-static void pcm1796_write(struct oxygen *chip, unsigned int codec,
-                         u8 reg, u8 value)
+static inline void pcm1796_write_spi(struct oxygen *chip, unsigned int codec,
+                                    u8 reg, u8 value)
 {
        /* maps ALSA channel pair number to SPI output */
        static const u8 codec_map[4] = {
@@ -157,6 +158,22 @@ static void pcm1796_write(struct oxygen *chip, unsigned int codec,
                         (reg << 8) | value);
 }
 
+static inline void pcm1796_write_i2c(struct oxygen *chip, unsigned int codec,
+                                    u8 reg, u8 value)
+{
+       oxygen_write_i2c(chip, I2C_DEVICE_PCM1796(codec), reg, value);
+}
+
+static void pcm1796_write(struct oxygen *chip, unsigned int codec,
+                         u8 reg, u8 value)
+{
+       if ((chip->model.function_flags & OXYGEN_FUNCTION_2WIRE_SPI_MASK) ==
+           OXYGEN_FUNCTION_SPI)
+               pcm1796_write_spi(chip, codec, reg, value);
+       else
+               pcm1796_write_i2c(chip, codec, reg, value);
+}
+
 static void cs4398_write(struct oxygen *chip, u8 reg, u8 value)
 {
        oxygen_write_i2c(chip, I2C_DEVICE_CS4398, reg, value);