[ALSA] soc - tlv320aic3x - add GPIO support

This patch adds support for AIC3x GPIO lines. They can be configured for
many possible functions as well as be driven manually. I also introduced
i2c read functionality since the GPIO state register has to be read from
hardware every time and can not be served from cache.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

1 files changed, 53 insertions, 0 deletions

diff --git a/sound/soc/codecs/tlv320aic3x.c b/sound/soc/codecs/tlv320aic3x.c
index 738b3b634d74..957996e0eba2 100644
--- a/sound/soc/codecs/tlv320aic3x.c
+++ b/sound/soc/codecs/tlv320aic3x.c
@@ -138,6 +138,20 @@ static int aic3x_write(struct snd_soc_codec *codec, unsigned int reg,
                 return -EIO;
 }
 
+/*
+ * read from the aic3x register space
+ */
+static int aic3x_read(struct snd_soc_codec *codec, unsigned int reg,
+                      u8 *value)
+{
+        *value = reg & 0xff;
+        if (codec->hw_read(codec->control_data, value, 1) != 1)
+                return -EIO;
+
+        aic3x_write_reg_cache(codec, reg, *value);
+        return 0;
+}
+
 #define SOC_DAPM_SINGLE_AIC3X(xname, reg, shift, mask, invert) \
 {       .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
         .info = snd_soc_info_volsw, \
@@ -911,6 +925,33 @@ static int aic3x_dapm_event(struct snd_soc_codec *codec, int event)
         return 0;
 }
 
+void aic3x_set_gpio(struct snd_soc_codec *codec, int gpio, int state)
+{
+        u8 reg = gpio ? AIC3X_GPIO2_REG : AIC3X_GPIO1_REG;
+        u8 bit = gpio ? 3: 0;
+        u8 val = aic3x_read_reg_cache(codec, reg) & ~(1 << bit);
+        aic3x_write(codec, reg, val | (!!state << bit));
+}
+EXPORT_SYMBOL_GPL(aic3x_set_gpio);
+
+int aic3x_get_gpio(struct snd_soc_codec *codec, int gpio)
+{
+        u8 reg = gpio ? AIC3X_GPIO2_REG : AIC3X_GPIO1_REG;
+        u8 val, bit = gpio ? 2: 1;
+
+        aic3x_read(codec, reg, &val);
+        return (val >> bit) & 1;
+}
+EXPORT_SYMBOL_GPL(aic3x_get_gpio);
+
+int aic3x_headset_detected(struct snd_soc_codec *codec)
+{
+        u8 val;
+        aic3x_read(codec, AIC3X_RT_IRQ_FLAGS_REG, &val);
+        return (val >> 2) & 1;
+}
+EXPORT_SYMBOL_GPL(aic3x_headset_detected);
+
 #define AIC3X_RATES     SNDRV_PCM_RATE_8000_96000
 #define AIC3X_FORMATS   (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \
                          SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S32_LE)
@@ -977,6 +1018,7 @@ static int aic3x_resume(struct platform_device *pdev)
 static int aic3x_init(struct snd_soc_device *socdev)
 {
         struct snd_soc_codec *codec = socdev->codec;
+        struct aic3x_setup_data *setup = socdev->codec_data;
         int reg, ret = 0;
 
         codec->name = "aic3x";
@@ -1067,6 +1109,10 @@ static int aic3x_init(struct snd_soc_device *socdev)
         /* off, with power on */
         aic3x_dapm_event(codec, SNDRV_CTL_POWER_D3hot);
 
+        /* setup GPIO functions */
+        aic3x_write(codec, AIC3X_GPIO1_REG, (setup->gpio_func[0] & 0xf) << 4);
+        aic3x_write(codec, AIC3X_GPIO2_REG, (setup->gpio_func[1] & 0xf) << 4);
+
         aic3x_add_controls(codec);
         aic3x_add_widgets(codec);
         ret = snd_soc_register_card(socdev);
@@ -1174,6 +1220,12 @@ static struct i2c_client client_template = {
         .name = "AIC3X",
         .driver = &aic3x_i2c_driver,
 };
+
+static int aic3x_i2c_read(struct i2c_client *client, u8 *value, int len)
+{
+        value[0] = i2c_smbus_read_byte_data(client, value[0]);
+        return (len == 1);
+}
 #endif
 
 static int aic3x_probe(struct platform_device *pdev)
@@ -1208,6 +1260,7 @@ static int aic3x_probe(struct platform_device *pdev)
         if (setup->i2c_address) {
                 normal_i2c[0] = setup->i2c_address;
                 codec->hw_write = (hw_write_t) i2c_master_send;
+                codec->hw_read = (hw_read_t) aic3x_i2c_read;
                 ret = i2c_add_driver(&aic3x_i2c_driver);
                 if (ret != 0)
                         printk(KERN_ERR "can't add i2c driver");