ASoC: Add GPIO support for jack reporting interface

Add GPIO support to jack reporting framework in ASoC using gpiolib calls.
The gpio support exports two new functions: snd_soc_jack_add_gpios and
snd_soc_jack_free_gpios.

Client drivers using gpio feature must pass an array of jack_gpio pins
belonging to a specific jack to the snd_soc_jack_add_gpios function. The
framework will request the gpios, set the data direction and request irq.
The framework will update power status of related jack_pins when an event on
the gpio pins comes according to the reporting bits defined for each gpio.

All gpio resources allocated when adding jack_gpio pins can be released
using snd_soc_jack_free_gpios function.

Signed-off-by: Misael Lopez Cruz <x0052729@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 0e7735264169..a40bc6f316fc 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -16,6 +16,8 @@
 #include <linux/platform_device.h>
 #include <linux/types.h>
 #include <linux/workqueue.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/control.h>
@@ -168,6 +170,9 @@ struct soc_enum;
 struct snd_soc_ac97_ops;
 struct snd_soc_jack;
 struct snd_soc_jack_pin;
+#ifdef CONFIG_GPIOLIB
+struct snd_soc_jack_gpio;
+#endif
 
 typedef int (*hw_write_t)(void *,const char* ,int);
 typedef int (*hw_read_t)(void *,char* ,int);
@@ -194,6 +199,12 @@ int snd_soc_jack_new(struct snd_soc_card *card, const char *id, int type,
 void snd_soc_jack_report(struct snd_soc_jack *jack, int status, int mask);
 int snd_soc_jack_add_pins(struct snd_soc_jack *jack, int count,
                           struct snd_soc_jack_pin *pins);
+#ifdef CONFIG_GPIOLIB
+int snd_soc_jack_add_gpios(struct snd_soc_jack *jack, int count,
+                        struct snd_soc_jack_gpio *gpios);
+void snd_soc_jack_free_gpios(struct snd_soc_jack *jack, int count,
+                        struct snd_soc_jack_gpio *gpios);
+#endif
 
 /* codec IO */
 #define snd_soc_read(codec, reg) codec->read(codec, reg)
@@ -264,6 +275,27 @@ struct snd_soc_jack_pin {
         bool invert;
 };
 
+/**
+ * struct snd_soc_jack_gpio - Describes a gpio pin for jack detection
+ *
+ * @gpio:         gpio number
+ * @name:         gpio name
+ * @report:       value to report when jack detected
+ * @invert:       report presence in low state
+ * @debouce_time: debouce time in ms
+ */
+#ifdef CONFIG_GPIOLIB
+struct snd_soc_jack_gpio {
+        unsigned int gpio;
+        const char *name;
+        int report;
+        int invert;
+        int debounce_time;
+        struct snd_soc_jack *jack;
+        struct work_struct work;
+};
+#endif
+
 struct snd_soc_jack {
         struct snd_jack *jack;
         struct snd_soc_card *card;