ASoC: Allow GPIO jack detection to be configured as a wake source

Some systems wish to use jacks as wake sources. Provide a wake flag in the
GPIO configuration which causes the driver to enable the IRQ as a wake
source.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>

include/sound/soc.h

@@ -436,6 +436,7 @@ struct snd_soc_jack_zone {
  * @report:       value to report when jack detected
  * @invert:       report presence in low state
  * @debouce_time: debouce time in ms
+ * @wake:	  enable as wake source
  */
 #ifdef CONFIG_GPIOLIB
 struct snd_soc_jack_gpio {
@@ -444,6 +445,8 @@ struct snd_soc_jack_gpio {
 	int report;
 	int invert;
 	int debounce_time;
+	bool wake;
+
 	struct snd_soc_jack *jack;
 	struct delayed_work work;
 

sound/soc/soc-jack.c

@@ -330,6 +330,14 @@ int snd_soc_jack_add_gpios(struct snd_soc_jack *jack, int count,
 		if (ret)
 			goto err;
 
+		if (gpios[i].wake) {
+			ret = set_irq_wake(gpio_to_irq(gpios[i].gpio), 1);
+			if (ret != 0)
+				printk(KERN_ERR
+				  "Failed to mark GPIO %d as wake source: %d\n",
+					gpios[i].gpio, ret);
+		}
+
 #ifdef CONFIG_GPIO_SYSFS
 		/* Expose GPIO value over sysfs for diagnostic purposes */
 		gpio_export(gpios[i].gpio, false);