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authorMark Brown <broonie@opensource.wolfsonmicro.com>2010-09-20 17:34:58 +0100
committerMark Brown <broonie@opensource.wolfsonmicro.com>2010-10-02 14:23:04 -0700
commit3367b8d4278d1f8a28995cc5e57a995f7147cb73 (patch)
tree7aba159ed2edcc206ec8b4e61de55fb23e59ceb3 /sound/soc/codecs/wm8962.c
parent205d231bfbd26bb10400518586d2a9f1b62858ee (diff)
ASoC: Add support for WM8962 GPIO outputs
The WM8962 features five GPIOs, add support for controlling their output state via gpiolib. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Diffstat (limited to 'sound/soc/codecs/wm8962.c')
-rw-r--r--sound/soc/codecs/wm8962.c119
1 files changed, 119 insertions, 0 deletions
diff --git a/sound/soc/codecs/wm8962.c b/sound/soc/codecs/wm8962.c
index 38cbf85688f6..eb66c66047b1 100644
--- a/sound/soc/codecs/wm8962.c
+++ b/sound/soc/codecs/wm8962.c
@@ -17,6 +17,7 @@
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/gcd.h>
+#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/platform_device.h>
@@ -70,6 +71,10 @@ struct wm8962_priv {
struct work_struct beep_work;
int beep_rate;
#endif
+
+#ifdef CONFIG_GPIOLIB
+ struct gpio_chip gpio_chip;
+#endif
};
/* We can't use the same notifier block for more than one supply and
@@ -1646,6 +1651,118 @@ static void wm8962_free_beep(struct snd_soc_codec *codec)
}
#endif
+#ifdef CONFIG_GPIOLIB
+static inline struct wm8962_priv *gpio_to_wm8962(struct gpio_chip *chip)
+{
+ return container_of(chip, struct wm8962_priv, gpio_chip);
+}
+
+static int wm8962_gpio_request(struct gpio_chip *chip, unsigned offset)
+{
+ struct wm8962_priv *wm8962 = gpio_to_wm8962(chip);
+ struct snd_soc_codec *codec = wm8962->codec;
+ int mask = 0;
+ int val;
+
+ /* The WM8962 GPIOs aren't linearly numbered. For simplicity
+ * we export linear numbers and error out if the unsupported
+ * ones are requsted.
+ */
+ switch (offset + 1) {
+ case 2:
+ mask = WM8962_CLKOUT2_SEL_MASK;
+ val = 1 << WM8962_CLKOUT2_SEL_SHIFT;
+ break;
+ case 3:
+ mask = WM8962_CLKOUT3_SEL_MASK;
+ val = 1 << WM8962_CLKOUT3_SEL_SHIFT;
+ break;
+ case 5:
+ case 6:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* Some of the GPIOs are behind MFP configuration */
+ if (mask)
+ snd_soc_update_bits(codec, WM8962_ANALOGUE_CLOCKING1,
+ mask, val);
+
+ return 0;
+}
+
+static void wm8962_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+ struct wm8962_priv *wm8962 = gpio_to_wm8962(chip);
+ struct snd_soc_codec *codec = wm8962->codec;
+
+ snd_soc_update_bits(codec, WM8962_GPIO_BASE + offset,
+ WM8962_GP2_LVL, value << WM8962_GP2_LVL_SHIFT);
+}
+
+static int wm8962_gpio_direction_out(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ struct wm8962_priv *wm8962 = gpio_to_wm8962(chip);
+ struct snd_soc_codec *codec = wm8962->codec;
+ int val;
+
+ /* Force function 1 (logic output) */
+ val = (1 << WM8962_GP2_FN_SHIFT) | (value << WM8962_GP2_LVL_SHIFT);
+
+ return snd_soc_update_bits(codec, WM8962_GPIO_BASE + offset,
+ WM8962_GP2_FN_MASK | WM8962_GP2_LVL, val);
+}
+
+static struct gpio_chip wm8962_template_chip = {
+ .label = "wm8962",
+ .owner = THIS_MODULE,
+ .request = wm8962_gpio_request,
+ .direction_output = wm8962_gpio_direction_out,
+ .set = wm8962_gpio_set,
+ .can_sleep = 1,
+};
+
+static void wm8962_init_gpio(struct snd_soc_codec *codec)
+{
+ struct wm8962_priv *wm8962 = snd_soc_codec_get_drvdata(codec);
+ struct wm8962_pdata *pdata = dev_get_platdata(codec->dev);
+ int ret;
+
+ wm8962->gpio_chip = wm8962_template_chip;
+ wm8962->gpio_chip.ngpio = WM8962_MAX_GPIO;
+ wm8962->gpio_chip.dev = codec->dev;
+
+ if (pdata && pdata->gpio_base)
+ wm8962->gpio_chip.base = pdata->gpio_base;
+ else
+ wm8962->gpio_chip.base = -1;
+
+ ret = gpiochip_add(&wm8962->gpio_chip);
+ if (ret != 0)
+ dev_err(codec->dev, "Failed to add GPIOs: %d\n", ret);
+}
+
+static void wm8962_free_gpio(struct snd_soc_codec *codec)
+{
+ struct wm8962_priv *wm8962 = snd_soc_codec_get_drvdata(codec);
+ int ret;
+
+ ret = gpiochip_remove(&wm8962->gpio_chip);
+ if (ret != 0)
+ dev_err(codec->dev, "Failed to remove GPIOs: %d\n", ret);
+}
+#else
+static void wm8962_init_gpio(struct snd_soc_codec *codec)
+{
+}
+
+static void wm8962_free_gpio(struct snd_soc_codec *codec)
+{
+}
+#endif
+
static int wm8962_probe(struct snd_soc_codec *codec)
{
int ret;
@@ -1778,6 +1895,7 @@ static int wm8962_probe(struct snd_soc_codec *codec)
wm8962_add_widgets(codec);
wm8962_init_beep(codec);
+ wm8962_init_gpio(codec);
if (i2c->irq) {
if (pdata && pdata->irq_active_low) {
@@ -1828,6 +1946,7 @@ static int wm8962_remove(struct snd_soc_codec *codec)
if (i2c->irq)
free_irq(i2c->irq, codec);
+ wm8962_free_gpio(codec);
wm8962_free_beep(codec);
for (i = 0; i < ARRAY_SIZE(wm8962->supplies); i++)
regulator_unregister_notifier(wm8962->supplies[i].consumer,