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author | Lopez Cruz, Misael <x0052729@ti.com> | 2009-03-03 15:25:04 -0600 |
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committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2009-03-04 14:47:38 +0000 |
commit | ec67624d33d5639bcc6ee6918cb1fc0bd1bac3a8 (patch) | |
tree | 301f1d4ae2f47cca1c7412ce49e7574de8b0dfd2 /sound/soc/soc-jack.c | |
parent | 5f2a9384a9291d898b4bf85c4fbf497eef582977 (diff) | |
download | linux-stable-ec67624d33d5639bcc6ee6918cb1fc0bd1bac3a8.tar.gz linux-stable-ec67624d33d5639bcc6ee6918cb1fc0bd1bac3a8.tar.bz2 linux-stable-ec67624d33d5639bcc6ee6918cb1fc0bd1bac3a8.zip |
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>
Diffstat (limited to 'sound/soc/soc-jack.c')
-rw-r--r-- | sound/soc/soc-jack.c | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/sound/soc/soc-jack.c b/sound/soc/soc-jack.c index ab64a30bedde..bdf2484c2220 100644 --- a/sound/soc/soc-jack.c +++ b/sound/soc/soc-jack.c @@ -14,6 +14,10 @@ #include <sound/jack.h> #include <sound/soc.h> #include <sound/soc-dapm.h> +#include <linux/gpio.h> +#include <linux/interrupt.h> +#include <linux/workqueue.h> +#include <linux/delay.h> /** * snd_soc_jack_new - Create a new jack @@ -136,3 +140,128 @@ int snd_soc_jack_add_pins(struct snd_soc_jack *jack, int count, return 0; } EXPORT_SYMBOL_GPL(snd_soc_jack_add_pins); + +#ifdef CONFIG_GPIOLIB +/* gpio detect */ +void snd_soc_jack_gpio_detect(struct snd_soc_jack_gpio *gpio) +{ + struct snd_soc_jack *jack = gpio->jack; + int enable; + int report; + + if (gpio->debounce_time > 0) + mdelay(gpio->debounce_time); + + enable = gpio_get_value(gpio->gpio); + if (gpio->invert) + enable = !enable; + + if (enable) + report = gpio->report; + else + report = 0; + + snd_soc_jack_report(jack, report, gpio->report); +} + +/* irq handler for gpio pin */ +static irqreturn_t gpio_handler(int irq, void *data) +{ + struct snd_soc_jack_gpio *gpio = data; + + schedule_work(&gpio->work); + + return IRQ_HANDLED; +} + +/* gpio work */ +static void gpio_work(struct work_struct *work) +{ + struct snd_soc_jack_gpio *gpio; + + gpio = container_of(work, struct snd_soc_jack_gpio, work); + snd_soc_jack_gpio_detect(gpio); +} + +/** + * snd_soc_jack_add_gpios - Associate GPIO pins with an ASoC jack + * + * @jack: ASoC jack + * @count: number of pins + * @gpios: array of gpio pins + * + * This function will request gpio, set data direction and request irq + * for each gpio in the array. + */ +int snd_soc_jack_add_gpios(struct snd_soc_jack *jack, int count, + struct snd_soc_jack_gpio *gpios) +{ + int i, ret; + + for (i = 0; i < count; i++) { + if (!gpio_is_valid(gpios[i].gpio)) { + printk(KERN_ERR "Invalid gpio %d\n", + gpios[i].gpio); + ret = -EINVAL; + goto undo; + } + if (!gpios[i].name) { + printk(KERN_ERR "No name for gpio %d\n", + gpios[i].gpio); + ret = -EINVAL; + goto undo; + } + + ret = gpio_request(gpios[i].gpio, gpios[i].name); + if (ret) + goto undo; + + ret = gpio_direction_input(gpios[i].gpio); + if (ret) + goto err; + + ret = request_irq(gpio_to_irq(gpios[i].gpio), + gpio_handler, + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, + jack->card->dev->driver->name, + &gpios[i]); + if (ret) + goto err; + + INIT_WORK(&gpios[i].work, gpio_work); + gpios[i].jack = jack; + } + + return 0; + +err: + gpio_free(gpios[i].gpio); +undo: + snd_soc_jack_free_gpios(jack, i, gpios); + + return ret; +} +EXPORT_SYMBOL_GPL(snd_soc_jack_add_gpios); + +/** + * snd_soc_jack_free_gpios - Release GPIO pins' resources of an ASoC jack + * + * @jack: ASoC jack + * @count: number of pins + * @gpios: array of gpio pins + * + * Release gpio and irq resources for gpio pins associated with an ASoC jack. + */ +void snd_soc_jack_free_gpios(struct snd_soc_jack *jack, int count, + struct snd_soc_jack_gpio *gpios) +{ + int i; + + for (i = 0; i < count; i++) { + free_irq(gpio_to_irq(gpios[i].gpio), &gpios[i]); + gpio_free(gpios[i].gpio); + gpios[i].jack = NULL; + } +} +EXPORT_SYMBOL_GPL(snd_soc_jack_free_gpios); +#endif /* CONFIG_GPIOLIB */ |