[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>
diff --git a/sound/soc/codecs/tlv320aic3x.c b/sound/soc/codecs/tlv320aic3x.c
index 738b3b6..957996e 100644
--- a/sound/soc/codecs/tlv320aic3x.c
+++ b/sound/soc/codecs/tlv320aic3x.c
@@ -138,6 +138,20 @@
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 @@
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_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 @@
/* 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 @@
.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 @@
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");
