2 * soc-jack.c -- ALSA SoC jack handling
4 * Copyright 2008 Wolfson Microelectronics PLC.
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
14 #include <sound/jack.h>
15 #include <sound/soc.h>
16 #include <sound/soc-dapm.h>
17 #include <linux/gpio.h>
18 #include <linux/interrupt.h>
19 #include <linux/workqueue.h>
20 #include <linux/delay.h>
23 * snd_soc_jack_new - Create a new jack
25 * @id: an identifying string for this jack
26 * @type: a bitmask of enum snd_jack_type values that can be detected by
28 * @jack: structure to use for the jack
30 * Creates a new jack object.
32 * Returns zero if successful, or a negative error code on failure.
33 * On success jack will be initialised.
35 int snd_soc_jack_new(struct snd_soc_card *card, const char *id, int type,
36 struct snd_soc_jack *jack)
39 INIT_LIST_HEAD(&jack->pins);
41 return snd_jack_new(card->codec->card, id, type, &jack->jack);
43 EXPORT_SYMBOL_GPL(snd_soc_jack_new);
46 * snd_soc_jack_report - Report the current status for a jack
49 * @status: a bitmask of enum snd_jack_type values that are currently detected.
50 * @mask: a bitmask of enum snd_jack_type values that being reported.
52 * If configured using snd_soc_jack_add_pins() then the associated
53 * DAPM pins will be enabled or disabled as appropriate and DAPM
56 * Note: This function uses mutexes and should be called from a
57 * context which can sleep (such as a workqueue).
59 void snd_soc_jack_report(struct snd_soc_jack *jack, int status, int mask)
61 struct snd_soc_codec *codec = jack->card->codec;
62 struct snd_soc_jack_pin *pin;
71 mutex_lock(&codec->mutex);
73 oldstatus = jack->status;
75 jack->status &= ~mask;
76 jack->status |= status;
78 /* The DAPM sync is expensive enough to be worth skipping */
79 if (jack->status == oldstatus)
82 list_for_each_entry(pin, &jack->pins, list) {
83 enable = pin->mask & status;
89 snd_soc_dapm_enable_pin(codec, pin->pin);
91 snd_soc_dapm_disable_pin(codec, pin->pin);
94 snd_soc_dapm_sync(codec);
96 snd_jack_report(jack->jack, status);
99 mutex_unlock(&codec->mutex);
101 EXPORT_SYMBOL_GPL(snd_soc_jack_report);
104 * snd_soc_jack_add_pins - Associate DAPM pins with an ASoC jack
107 * @count: Number of pins
108 * @pins: Array of pins
110 * After this function has been called the DAPM pins specified in the
111 * pins array will have their status updated to reflect the current
112 * state of the jack whenever the jack status is updated.
114 int snd_soc_jack_add_pins(struct snd_soc_jack *jack, int count,
115 struct snd_soc_jack_pin *pins)
119 for (i = 0; i < count; i++) {
121 printk(KERN_ERR "No name for pin %d\n", i);
125 printk(KERN_ERR "No mask for pin %d (%s)\n", i,
130 INIT_LIST_HEAD(&pins[i].list);
131 list_add(&(pins[i].list), &jack->pins);
134 /* Update to reflect the last reported status; canned jack
135 * implementations are likely to set their state before the
136 * card has an opportunity to associate pins.
138 snd_soc_jack_report(jack, 0, 0);
142 EXPORT_SYMBOL_GPL(snd_soc_jack_add_pins);
144 #ifdef CONFIG_GPIOLIB
146 static void snd_soc_jack_gpio_detect(struct snd_soc_jack_gpio *gpio)
148 struct snd_soc_jack *jack = gpio->jack;
152 if (gpio->debounce_time > 0)
153 mdelay(gpio->debounce_time);
155 enable = gpio_get_value(gpio->gpio);
160 report = gpio->report;
164 snd_soc_jack_report(jack, report, gpio->report);
167 /* irq handler for gpio pin */
168 static irqreturn_t gpio_handler(int irq, void *data)
170 struct snd_soc_jack_gpio *gpio = data;
172 schedule_work(&gpio->work);
178 static void gpio_work(struct work_struct *work)
180 struct snd_soc_jack_gpio *gpio;
182 gpio = container_of(work, struct snd_soc_jack_gpio, work);
183 snd_soc_jack_gpio_detect(gpio);
187 * snd_soc_jack_add_gpios - Associate GPIO pins with an ASoC jack
190 * @count: number of pins
191 * @gpios: array of gpio pins
193 * This function will request gpio, set data direction and request irq
194 * for each gpio in the array.
196 int snd_soc_jack_add_gpios(struct snd_soc_jack *jack, int count,
197 struct snd_soc_jack_gpio *gpios)
201 for (i = 0; i < count; i++) {
202 if (!gpio_is_valid(gpios[i].gpio)) {
203 printk(KERN_ERR "Invalid gpio %d\n",
208 if (!gpios[i].name) {
209 printk(KERN_ERR "No name for gpio %d\n",
215 ret = gpio_request(gpios[i].gpio, gpios[i].name);
219 ret = gpio_direction_input(gpios[i].gpio);
223 ret = request_irq(gpio_to_irq(gpios[i].gpio),
225 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
226 jack->card->dev->driver->name,
231 INIT_WORK(&gpios[i].work, gpio_work);
232 gpios[i].jack = jack;
238 gpio_free(gpios[i].gpio);
240 snd_soc_jack_free_gpios(jack, i, gpios);
244 EXPORT_SYMBOL_GPL(snd_soc_jack_add_gpios);
247 * snd_soc_jack_free_gpios - Release GPIO pins' resources of an ASoC jack
250 * @count: number of pins
251 * @gpios: array of gpio pins
253 * Release gpio and irq resources for gpio pins associated with an ASoC jack.
255 void snd_soc_jack_free_gpios(struct snd_soc_jack *jack, int count,
256 struct snd_soc_jack_gpio *gpios)
260 for (i = 0; i < count; i++) {
261 free_irq(gpio_to_irq(gpios[i].gpio), &gpios[i]);
262 gpio_free(gpios[i].gpio);
263 gpios[i].jack = NULL;
266 EXPORT_SYMBOL_GPL(snd_soc_jack_free_gpios);
267 #endif /* CONFIG_GPIOLIB */