summaryrefslogtreecommitdiff
path: root/sound/soc/soc-ac97.c
diff options
context:
space:
mode:
authorRobert Jarzmik <robert.jarzmik@free.fr>2015-11-11 13:12:51 +0100
committerMark Brown <broonie@kernel.org>2015-11-18 18:08:54 +0000
commit9bf5c3d11f1fbaf43399d189f05fb20ceb46ee5d (patch)
treeff770ab3d145eaecf4a877a481388a6d55f9e478 /sound/soc/soc-ac97.c
parent8005c49d9aea74d382f474ce11afbbc7d7130bec (diff)
downloadlinux-9bf5c3d11f1fbaf43399d189f05fb20ceb46ee5d.tar.gz
ASoC: ac97: add gpio chip
The AC97 specification provides a guide for 16 GPIOs in the codecs. If the gpiolib is compiled in the kernel, declare a gpio chip. This was tested with a pxa27x board (mioa701) and a wm9713 codec. Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/soc-ac97.c')
-rw-r--r--sound/soc/soc-ac97.c125
1 files changed, 125 insertions, 0 deletions
diff --git a/sound/soc/soc-ac97.c b/sound/soc/soc-ac97.c
index d40efc9fe0a9..ae563e379a72 100644
--- a/sound/soc/soc-ac97.c
+++ b/sound/soc/soc-ac97.c
@@ -20,6 +20,7 @@
#include <linux/delay.h>
#include <linux/export.h>
#include <linux/gpio.h>
+#include <linux/gpio/driver.h>
#include <linux/init.h>
#include <linux/of_gpio.h>
#include <linux/of.h>
@@ -38,6 +39,14 @@ struct snd_ac97_reset_cfg {
int gpio_reset;
};
+struct snd_ac97_gpio_priv {
+#ifdef CONFIG_GPIOLIB
+ struct gpio_chip gpio_chip;
+#endif
+ unsigned int gpios_set;
+ struct snd_soc_codec *codec;
+};
+
static struct snd_ac97_bus soc_ac97_bus = {
.ops = NULL, /* Gets initialized in snd_soc_set_ac97_ops() */
};
@@ -47,6 +56,117 @@ static void soc_ac97_device_release(struct device *dev)
kfree(to_ac97_t(dev));
}
+#ifdef CONFIG_GPIOLIB
+static inline struct snd_soc_codec *gpio_to_codec(struct gpio_chip *chip)
+{
+ struct snd_ac97_gpio_priv *gpio_priv =
+ container_of(chip, struct snd_ac97_gpio_priv, gpio_chip);
+
+ return gpio_priv->codec;
+}
+
+static int snd_soc_ac97_gpio_request(struct gpio_chip *chip, unsigned offset)
+{
+ if (offset >= AC97_NUM_GPIOS)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int snd_soc_ac97_gpio_direction_in(struct gpio_chip *chip,
+ unsigned offset)
+{
+ struct snd_soc_codec *codec = gpio_to_codec(chip);
+
+ dev_dbg(codec->dev, "set gpio %d to output\n", offset);
+ return snd_soc_update_bits(codec, AC97_GPIO_CFG,
+ 1 << offset, 1 << offset);
+}
+
+static int snd_soc_ac97_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ struct snd_soc_codec *codec = gpio_to_codec(chip);
+ int ret;
+
+ ret = snd_soc_read(codec, AC97_GPIO_STATUS);
+ dev_dbg(codec->dev, "get gpio %d : %d\n", offset,
+ ret < 0 ? ret : ret & (1 << offset));
+
+ return ret < 0 ? ret : ret & (1 << offset);
+}
+
+static void snd_soc_ac97_gpio_set(struct gpio_chip *chip, unsigned offset,
+ int value)
+{
+ struct snd_ac97_gpio_priv *gpio_priv =
+ container_of(chip, struct snd_ac97_gpio_priv, gpio_chip);
+ struct snd_soc_codec *codec = gpio_to_codec(chip);
+
+ gpio_priv->gpios_set &= ~(1 << offset);
+ gpio_priv->gpios_set |= (!!value) << offset;
+ snd_soc_write(codec, AC97_GPIO_STATUS, gpio_priv->gpios_set);
+ dev_dbg(codec->dev, "set gpio %d to %d\n", offset, !!value);
+}
+
+static int snd_soc_ac97_gpio_direction_out(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ struct snd_soc_codec *codec = gpio_to_codec(chip);
+
+ dev_dbg(codec->dev, "set gpio %d to output\n", offset);
+ snd_soc_ac97_gpio_set(chip, offset, value);
+ return snd_soc_update_bits(codec, AC97_GPIO_CFG, 1 << offset, 0);
+}
+
+static struct gpio_chip snd_soc_ac97_gpio_chip = {
+ .label = "snd_soc_ac97",
+ .owner = THIS_MODULE,
+ .request = snd_soc_ac97_gpio_request,
+ .direction_input = snd_soc_ac97_gpio_direction_in,
+ .get = snd_soc_ac97_gpio_get,
+ .direction_output = snd_soc_ac97_gpio_direction_out,
+ .set = snd_soc_ac97_gpio_set,
+ .can_sleep = 1,
+};
+
+static int snd_soc_ac97_init_gpio(struct snd_ac97 *ac97,
+ struct snd_soc_codec *codec)
+{
+ struct snd_ac97_gpio_priv *gpio_priv;
+ int ret;
+
+ gpio_priv = devm_kzalloc(codec->dev, sizeof(*gpio_priv), GFP_KERNEL);
+ if (!gpio_priv)
+ return -ENOMEM;
+ ac97->gpio_priv = gpio_priv;
+ gpio_priv->codec = codec;
+ gpio_priv->gpio_chip = snd_soc_ac97_gpio_chip;
+ gpio_priv->gpio_chip.ngpio = AC97_NUM_GPIOS;
+ gpio_priv->gpio_chip.dev = codec->dev;
+ gpio_priv->gpio_chip.base = -1;
+
+ ret = gpiochip_add(&gpio_priv->gpio_chip);
+ if (ret != 0)
+ dev_err(codec->dev, "Failed to add GPIOs: %d\n", ret);
+ return ret;
+}
+
+static void snd_soc_ac97_free_gpio(struct snd_ac97 *ac97)
+{
+ gpiochip_remove(&ac97->gpio_priv->gpio_chip);
+}
+#else
+static int snd_soc_ac97_init_gpio(struct snd_ac97 *ac97,
+ struct snd_soc_codec *codec)
+{
+ return 0;
+}
+
+static void snd_soc_ac97_free_gpio(struct snd_ac97 *ac97)
+{
+}
+#endif
+
/**
* snd_soc_alloc_ac97_codec() - Allocate new a AC'97 device
* @codec: The CODEC for which to create the AC'97 device
@@ -119,6 +239,10 @@ struct snd_ac97 *snd_soc_new_ac97_codec(struct snd_soc_codec *codec,
if (ret)
goto err_put_device;
+ ret = snd_soc_ac97_init_gpio(ac97, codec);
+ if (ret)
+ goto err_put_device;
+
return ac97;
err_put_device:
@@ -135,6 +259,7 @@ EXPORT_SYMBOL_GPL(snd_soc_new_ac97_codec);
*/
void snd_soc_free_ac97_codec(struct snd_ac97 *ac97)
{
+ snd_soc_ac97_free_gpio(ac97);
device_del(&ac97->dev);
ac97->bus = NULL;
put_device(&ac97->dev);