1 /* 2 * soc-jack.c -- ALSA SoC jack handling 3 * 4 * Copyright 2008 Wolfson Microelectronics PLC. 5 * 6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 7 * 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. 12 */ 13 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> 21 22 /** 23 * snd_soc_jack_new - Create a new jack 24 * @card: ASoC card 25 * @id: an identifying string for this jack 26 * @type: a bitmask of enum snd_jack_type values that can be detected by 27 * this jack 28 * @jack: structure to use for the jack 29 * 30 * Creates a new jack object. 31 * 32 * Returns zero if successful, or a negative error code on failure. 33 * On success jack will be initialised. 34 */ 35 int snd_soc_jack_new(struct snd_soc_card *card, const char *id, int type, 36 struct snd_soc_jack *jack) 37 { 38 jack->card = card; 39 INIT_LIST_HEAD(&jack->pins); 40 41 return snd_jack_new(card->codec->card, id, type, &jack->jack); 42 } 43 EXPORT_SYMBOL_GPL(snd_soc_jack_new); 44 45 /** 46 * snd_soc_jack_report - Report the current status for a jack 47 * 48 * @jack: the 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. 51 * 52 * If configured using snd_soc_jack_add_pins() then the associated 53 * DAPM pins will be enabled or disabled as appropriate and DAPM 54 * synchronised. 55 * 56 * Note: This function uses mutexes and should be called from a 57 * context which can sleep (such as a workqueue). 58 */ 59 void snd_soc_jack_report(struct snd_soc_jack *jack, int status, int mask) 60 { 61 struct snd_soc_codec *codec = jack->card->codec; 62 struct snd_soc_jack_pin *pin; 63 int enable; 64 int oldstatus; 65 66 if (!jack) { 67 WARN_ON_ONCE(!jack); 68 return; 69 } 70 71 mutex_lock(&codec->mutex); 72 73 oldstatus = jack->status; 74 75 jack->status &= ~mask; 76 jack->status |= status; 77 78 /* The DAPM sync is expensive enough to be worth skipping */ 79 if (jack->status == oldstatus) 80 goto out; 81 82 list_for_each_entry(pin, &jack->pins, list) { 83 enable = pin->mask & status; 84 85 if (pin->invert) 86 enable = !enable; 87 88 if (enable) 89 snd_soc_dapm_enable_pin(codec, pin->pin); 90 else 91 snd_soc_dapm_disable_pin(codec, pin->pin); 92 } 93 94 snd_soc_dapm_sync(codec); 95 96 snd_jack_report(jack->jack, status); 97 98 out: 99 mutex_unlock(&codec->mutex); 100 } 101 EXPORT_SYMBOL_GPL(snd_soc_jack_report); 102 103 /** 104 * snd_soc_jack_add_pins - Associate DAPM pins with an ASoC jack 105 * 106 * @jack: ASoC jack 107 * @count: Number of pins 108 * @pins: Array of pins 109 * 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. 113 */ 114 int snd_soc_jack_add_pins(struct snd_soc_jack *jack, int count, 115 struct snd_soc_jack_pin *pins) 116 { 117 int i; 118 119 for (i = 0; i < count; i++) { 120 if (!pins[i].pin) { 121 printk(KERN_ERR "No name for pin %d\n", i); 122 return -EINVAL; 123 } 124 if (!pins[i].mask) { 125 printk(KERN_ERR "No mask for pin %d (%s)\n", i, 126 pins[i].pin); 127 return -EINVAL; 128 } 129 130 INIT_LIST_HEAD(&pins[i].list); 131 list_add(&(pins[i].list), &jack->pins); 132 } 133 134 /* 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. 137 */ 138 snd_soc_jack_report(jack, 0, 0); 139 140 return 0; 141 } 142 EXPORT_SYMBOL_GPL(snd_soc_jack_add_pins); 143 144 #ifdef CONFIG_GPIOLIB 145 /* gpio detect */ 146 static void snd_soc_jack_gpio_detect(struct snd_soc_jack_gpio *gpio) 147 { 148 struct snd_soc_jack *jack = gpio->jack; 149 int enable; 150 int report; 151 152 if (gpio->debounce_time > 0) 153 mdelay(gpio->debounce_time); 154 155 enable = gpio_get_value(gpio->gpio); 156 if (gpio->invert) 157 enable = !enable; 158 159 if (enable) 160 report = gpio->report; 161 else 162 report = 0; 163 164 snd_soc_jack_report(jack, report, gpio->report); 165 } 166 167 /* irq handler for gpio pin */ 168 static irqreturn_t gpio_handler(int irq, void *data) 169 { 170 struct snd_soc_jack_gpio *gpio = data; 171 172 schedule_work(&gpio->work); 173 174 return IRQ_HANDLED; 175 } 176 177 /* gpio work */ 178 static void gpio_work(struct work_struct *work) 179 { 180 struct snd_soc_jack_gpio *gpio; 181 182 gpio = container_of(work, struct snd_soc_jack_gpio, work); 183 snd_soc_jack_gpio_detect(gpio); 184 } 185 186 /** 187 * snd_soc_jack_add_gpios - Associate GPIO pins with an ASoC jack 188 * 189 * @jack: ASoC jack 190 * @count: number of pins 191 * @gpios: array of gpio pins 192 * 193 * This function will request gpio, set data direction and request irq 194 * for each gpio in the array. 195 */ 196 int snd_soc_jack_add_gpios(struct snd_soc_jack *jack, int count, 197 struct snd_soc_jack_gpio *gpios) 198 { 199 int i, ret; 200 201 for (i = 0; i < count; i++) { 202 if (!gpio_is_valid(gpios[i].gpio)) { 203 printk(KERN_ERR "Invalid gpio %d\n", 204 gpios[i].gpio); 205 ret = -EINVAL; 206 goto undo; 207 } 208 if (!gpios[i].name) { 209 printk(KERN_ERR "No name for gpio %d\n", 210 gpios[i].gpio); 211 ret = -EINVAL; 212 goto undo; 213 } 214 215 ret = gpio_request(gpios[i].gpio, gpios[i].name); 216 if (ret) 217 goto undo; 218 219 ret = gpio_direction_input(gpios[i].gpio); 220 if (ret) 221 goto err; 222 223 ret = request_irq(gpio_to_irq(gpios[i].gpio), 224 gpio_handler, 225 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, 226 jack->card->dev->driver->name, 227 &gpios[i]); 228 if (ret) 229 goto err; 230 231 INIT_WORK(&gpios[i].work, gpio_work); 232 gpios[i].jack = jack; 233 } 234 235 return 0; 236 237 err: 238 gpio_free(gpios[i].gpio); 239 undo: 240 snd_soc_jack_free_gpios(jack, i, gpios); 241 242 return ret; 243 } 244 EXPORT_SYMBOL_GPL(snd_soc_jack_add_gpios); 245 246 /** 247 * snd_soc_jack_free_gpios - Release GPIO pins' resources of an ASoC jack 248 * 249 * @jack: ASoC jack 250 * @count: number of pins 251 * @gpios: array of gpio pins 252 * 253 * Release gpio and irq resources for gpio pins associated with an ASoC jack. 254 */ 255 void snd_soc_jack_free_gpios(struct snd_soc_jack *jack, int count, 256 struct snd_soc_jack_gpio *gpios) 257 { 258 int i; 259 260 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; 264 } 265 } 266 EXPORT_SYMBOL_GPL(snd_soc_jack_free_gpios); 267 #endif /* CONFIG_GPIOLIB */ 268