| /* |
| * soc-jack.c -- ALSA SoC jack handling |
| * |
| * Copyright 2008 Wolfson Microelectronics PLC. |
| * |
| * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the |
| * Free Software Foundation; either version 2 of the License, or (at your |
| * option) any later version. |
| */ |
| |
| #include <sound/jack.h> |
| #include <sound/soc.h> |
| #include <linux/gpio.h> |
| #include <linux/interrupt.h> |
| #include <linux/workqueue.h> |
| #include <linux/delay.h> |
| #include <linux/export.h> |
| #include <trace/events/asoc.h> |
| |
| /** |
| * snd_soc_jack_new - Create a new jack |
| * @codec: ASoC codec |
| * @id: an identifying string for this jack |
| * @type: a bitmask of enum snd_jack_type values that can be detected by |
| * this jack |
| * @jack: structure to use for the jack |
| * |
| * Creates a new jack object. |
| * |
| * Returns zero if successful, or a negative error code on failure. |
| * On success jack will be initialised. |
| */ |
| int snd_soc_jack_new(struct snd_soc_codec *codec, const char *id, int type, |
| struct snd_soc_jack *jack) |
| { |
| mutex_init(&jack->mutex); |
| jack->codec = codec; |
| INIT_LIST_HEAD(&jack->pins); |
| INIT_LIST_HEAD(&jack->jack_zones); |
| BLOCKING_INIT_NOTIFIER_HEAD(&jack->notifier); |
| |
| return snd_jack_new(codec->card->snd_card, id, type, &jack->jack); |
| } |
| EXPORT_SYMBOL_GPL(snd_soc_jack_new); |
| |
| /** |
| * snd_soc_jack_report - Report the current status for a jack |
| * |
| * @jack: the jack |
| * @status: a bitmask of enum snd_jack_type values that are currently detected. |
| * @mask: a bitmask of enum snd_jack_type values that being reported. |
| * |
| * If configured using snd_soc_jack_add_pins() then the associated |
| * DAPM pins will be enabled or disabled as appropriate and DAPM |
| * synchronised. |
| * |
| * Note: This function uses mutexes and should be called from a |
| * context which can sleep (such as a workqueue). |
| */ |
| void snd_soc_jack_report(struct snd_soc_jack *jack, int status, int mask) |
| { |
| struct snd_soc_codec *codec; |
| struct snd_soc_dapm_context *dapm; |
| struct snd_soc_jack_pin *pin; |
| int enable; |
| |
| trace_snd_soc_jack_report(jack, mask, status); |
| |
| if (!jack) |
| return; |
| |
| codec = jack->codec; |
| dapm = &codec->dapm; |
| |
| mutex_lock(&jack->mutex); |
| |
| jack->status &= ~mask; |
| jack->status |= status & mask; |
| |
| trace_snd_soc_jack_notify(jack, status); |
| |
| list_for_each_entry(pin, &jack->pins, list) { |
| enable = pin->mask & jack->status; |
| |
| if (pin->invert) |
| enable = !enable; |
| |
| if (enable) |
| snd_soc_dapm_enable_pin(dapm, pin->pin); |
| else |
| snd_soc_dapm_disable_pin(dapm, pin->pin); |
| } |
| |
| /* Report before the DAPM sync to help users updating micbias status */ |
| blocking_notifier_call_chain(&jack->notifier, jack->status, jack); |
| |
| snd_soc_dapm_sync(dapm); |
| |
| snd_jack_report(jack->jack, jack->status); |
| |
| mutex_unlock(&jack->mutex); |
| } |
| EXPORT_SYMBOL_GPL(snd_soc_jack_report); |
| |
| /** |
| * snd_soc_jack_report_no_dapm - Report the current status for a jack |
| * without DAPM sync |
| * @jack: the jack |
| * @status: a bitmask of enum snd_jack_type values that are currently detected. |
| * @mask: a bitmask of enum snd_jack_type values that being reported. |
| */ |
| void snd_soc_jack_report_no_dapm(struct snd_soc_jack *jack, int status, |
| int mask) |
| { |
| jack->status &= ~mask; |
| jack->status |= status & mask; |
| |
| snd_jack_report(jack->jack, jack->status); |
| } |
| EXPORT_SYMBOL_GPL(snd_soc_jack_report_no_dapm); |
| |
| /** |
| * snd_soc_jack_add_zones - Associate voltage zones with jack |
| * |
| * @jack: ASoC jack |
| * @count: Number of zones |
| * @zone: Array of zones |
| * |
| * After this function has been called the zones specified in the |
| * array will be associated with the jack. |
| */ |
| int snd_soc_jack_add_zones(struct snd_soc_jack *jack, int count, |
| struct snd_soc_jack_zone *zones) |
| { |
| int i; |
| |
| for (i = 0; i < count; i++) { |
| INIT_LIST_HEAD(&zones[i].list); |
| list_add(&(zones[i].list), &jack->jack_zones); |
| } |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(snd_soc_jack_add_zones); |
| |
| /** |
| * snd_soc_jack_get_type - Based on the mic bias value, this function returns |
| * the type of jack from the zones declared in the jack type |
| * |
| * @jack: ASoC jack |
| * @micbias_voltage: mic bias voltage at adc channel when jack is plugged in |
| * |
| * Based on the mic bias value passed, this function helps identify |
| * the type of jack from the already declared jack zones |
| */ |
| int snd_soc_jack_get_type(struct snd_soc_jack *jack, int micbias_voltage) |
| { |
| struct snd_soc_jack_zone *zone; |
| |
| list_for_each_entry(zone, &jack->jack_zones, list) { |
| if (micbias_voltage >= zone->min_mv && |
| micbias_voltage < zone->max_mv) |
| return zone->jack_type; |
| } |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(snd_soc_jack_get_type); |
| |
| /** |
| * snd_soc_jack_add_pins - Associate DAPM pins with an ASoC jack |
| * |
| * @jack: ASoC jack |
| * @count: Number of pins |
| * @pins: Array of pins |
| * |
| * After this function has been called the DAPM pins specified in the |
| * pins array will have their status updated to reflect the current |
| * state of the jack whenever the jack status is updated. |
| */ |
| int snd_soc_jack_add_pins(struct snd_soc_jack *jack, int count, |
| struct snd_soc_jack_pin *pins) |
| { |
| int i; |
| |
| for (i = 0; i < count; i++) { |
| if (!pins[i].pin) { |
| dev_err(jack->codec->dev, "ASoC: No name for pin %d\n", |
| i); |
| return -EINVAL; |
| } |
| if (!pins[i].mask) { |
| dev_err(jack->codec->dev, "ASoC: No mask for pin %d" |
| " (%s)\n", i, pins[i].pin); |
| return -EINVAL; |
| } |
| |
| INIT_LIST_HEAD(&pins[i].list); |
| list_add(&(pins[i].list), &jack->pins); |
| } |
| |
| snd_soc_dapm_new_widgets(&jack->codec->card->dapm); |
| |
| /* Update to reflect the last reported status; canned jack |
| * implementations are likely to set their state before the |
| * card has an opportunity to associate pins. |
| */ |
| snd_soc_jack_report(jack, 0, 0); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(snd_soc_jack_add_pins); |
| |
| /** |
| * snd_soc_jack_notifier_register - Register a notifier for jack status |
| * |
| * @jack: ASoC jack |
| * @nb: Notifier block to register |
| * |
| * Register for notification of the current status of the jack. Note |
| * that it is not possible to report additional jack events in the |
| * callback from the notifier, this is intended to support |
| * applications such as enabling electrical detection only when a |
| * mechanical detection event has occurred. |
| */ |
| void snd_soc_jack_notifier_register(struct snd_soc_jack *jack, |
| struct notifier_block *nb) |
| { |
| blocking_notifier_chain_register(&jack->notifier, nb); |
| } |
| EXPORT_SYMBOL_GPL(snd_soc_jack_notifier_register); |
| |
| /** |
| * snd_soc_jack_notifier_unregister - Unregister a notifier for jack status |
| * |
| * @jack: ASoC jack |
| * @nb: Notifier block to unregister |
| * |
| * Stop notifying for status changes. |
| */ |
| void snd_soc_jack_notifier_unregister(struct snd_soc_jack *jack, |
| struct notifier_block *nb) |
| { |
| blocking_notifier_chain_unregister(&jack->notifier, nb); |
| } |
| EXPORT_SYMBOL_GPL(snd_soc_jack_notifier_unregister); |
| |
| #ifdef CONFIG_GPIOLIB |
| /* gpio detect */ |
| static void snd_soc_jack_gpio_detect(struct snd_soc_jack_gpio *gpio) |
| { |
| struct snd_soc_jack *jack = gpio->jack; |
| int enable; |
| int report; |
| |
| enable = gpio_get_value_cansleep(gpio->gpio); |
| if (gpio->invert) |
| enable = !enable; |
| |
| if (enable) |
| report = gpio->report; |
| else |
| report = 0; |
| |
| if (gpio->jack_status_check) |
| report = gpio->jack_status_check(); |
| |
| 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; |
| struct device *dev = gpio->jack->codec->card->dev; |
| |
| trace_snd_soc_jack_irq(gpio->name); |
| |
| if (device_may_wakeup(dev)) |
| pm_wakeup_event(dev, gpio->debounce_time + 50); |
| |
| schedule_delayed_work(&gpio->work, |
| msecs_to_jiffies(gpio->debounce_time)); |
| |
| 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.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)) { |
| dev_err(jack->codec->dev, "ASoC: Invalid gpio %d\n", |
| gpios[i].gpio); |
| ret = -EINVAL; |
| goto undo; |
| } |
| if (!gpios[i].name) { |
| dev_err(jack->codec->dev, "ASoC: 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; |
| |
| INIT_DELAYED_WORK(&gpios[i].work, gpio_work); |
| gpios[i].jack = jack; |
| |
| ret = request_any_context_irq(gpio_to_irq(gpios[i].gpio), |
| gpio_handler, |
| IRQF_TRIGGER_RISING | |
| IRQF_TRIGGER_FALLING, |
| gpios[i].name, |
| &gpios[i]); |
| if (ret < 0) |
| goto err; |
| |
| if (gpios[i].wake) { |
| ret = irq_set_irq_wake(gpio_to_irq(gpios[i].gpio), 1); |
| if (ret != 0) |
| dev_err(jack->codec->dev, "ASoC: " |
| "Failed to mark GPIO %d as wake source: %d\n", |
| gpios[i].gpio, ret); |
| } |
| |
| /* Expose GPIO value over sysfs for diagnostic purposes */ |
| gpio_export(gpios[i].gpio, false); |
| |
| /* Update initial jack status */ |
| snd_soc_jack_gpio_detect(&gpios[i]); |
| } |
| |
| 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++) { |
| gpio_unexport(gpios[i].gpio); |
| free_irq(gpio_to_irq(gpios[i].gpio), &gpios[i]); |
| cancel_delayed_work_sync(&gpios[i].work); |
| gpio_free(gpios[i].gpio); |
| gpios[i].jack = NULL; |
| } |
| } |
| EXPORT_SYMBOL_GPL(snd_soc_jack_free_gpios); |
| #endif /* CONFIG_GPIOLIB */ |