Commit | Line | Data |
---|---|---|
8a2cd618 MB |
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> | |
ec67624d LCM |
17 | #include <linux/gpio.h> |
18 | #include <linux/interrupt.h> | |
19 | #include <linux/workqueue.h> | |
20 | #include <linux/delay.h> | |
8a2cd618 MB |
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 | */ | |
f0fba2ad | 35 | int snd_soc_jack_new(struct snd_soc_codec *codec, const char *id, int type, |
8a2cd618 MB |
36 | struct snd_soc_jack *jack) |
37 | { | |
f0fba2ad | 38 | jack->codec = codec; |
8a2cd618 | 39 | INIT_LIST_HEAD(&jack->pins); |
d5021ec9 | 40 | BLOCKING_INIT_NOTIFIER_HEAD(&jack->notifier); |
8a2cd618 | 41 | |
f0fba2ad | 42 | return snd_jack_new(codec->card->snd_card, id, type, &jack->jack); |
8a2cd618 MB |
43 | } |
44 | EXPORT_SYMBOL_GPL(snd_soc_jack_new); | |
45 | ||
46 | /** | |
47 | * snd_soc_jack_report - Report the current status for a jack | |
48 | * | |
49 | * @jack: the jack | |
50 | * @status: a bitmask of enum snd_jack_type values that are currently detected. | |
51 | * @mask: a bitmask of enum snd_jack_type values that being reported. | |
52 | * | |
53 | * If configured using snd_soc_jack_add_pins() then the associated | |
54 | * DAPM pins will be enabled or disabled as appropriate and DAPM | |
55 | * synchronised. | |
56 | * | |
57 | * Note: This function uses mutexes and should be called from a | |
58 | * context which can sleep (such as a workqueue). | |
59 | */ | |
60 | void snd_soc_jack_report(struct snd_soc_jack *jack, int status, int mask) | |
61 | { | |
4f066173 | 62 | struct snd_soc_codec *codec; |
8a2cd618 MB |
63 | struct snd_soc_jack_pin *pin; |
64 | int enable; | |
65 | int oldstatus; | |
66 | ||
3a278a0c | 67 | if (!jack) |
8a2cd618 | 68 | return; |
3a278a0c | 69 | |
f0fba2ad | 70 | codec = jack->codec; |
8a2cd618 MB |
71 | |
72 | mutex_lock(&codec->mutex); | |
73 | ||
74 | oldstatus = jack->status; | |
75 | ||
76 | jack->status &= ~mask; | |
178b699c | 77 | jack->status |= status & mask; |
8a2cd618 | 78 | |
178b699c JK |
79 | /* The DAPM sync is expensive enough to be worth skipping. |
80 | * However, empty mask means pin synchronization is desired. */ | |
81 | if (mask && (jack->status == oldstatus)) | |
8a2cd618 MB |
82 | goto out; |
83 | ||
84 | list_for_each_entry(pin, &jack->pins, list) { | |
178b699c | 85 | enable = pin->mask & jack->status; |
8a2cd618 MB |
86 | |
87 | if (pin->invert) | |
88 | enable = !enable; | |
89 | ||
90 | if (enable) | |
91 | snd_soc_dapm_enable_pin(codec, pin->pin); | |
92 | else | |
93 | snd_soc_dapm_disable_pin(codec, pin->pin); | |
94 | } | |
95 | ||
d5021ec9 MB |
96 | /* Report before the DAPM sync to help users updating micbias status */ |
97 | blocking_notifier_call_chain(&jack->notifier, status, NULL); | |
98 | ||
8a2cd618 MB |
99 | snd_soc_dapm_sync(codec); |
100 | ||
101 | snd_jack_report(jack->jack, status); | |
102 | ||
103 | out: | |
104 | mutex_unlock(&codec->mutex); | |
105 | } | |
106 | EXPORT_SYMBOL_GPL(snd_soc_jack_report); | |
107 | ||
108 | /** | |
109 | * snd_soc_jack_add_pins - Associate DAPM pins with an ASoC jack | |
110 | * | |
111 | * @jack: ASoC jack | |
112 | * @count: Number of pins | |
113 | * @pins: Array of pins | |
114 | * | |
115 | * After this function has been called the DAPM pins specified in the | |
116 | * pins array will have their status updated to reflect the current | |
117 | * state of the jack whenever the jack status is updated. | |
118 | */ | |
119 | int snd_soc_jack_add_pins(struct snd_soc_jack *jack, int count, | |
120 | struct snd_soc_jack_pin *pins) | |
121 | { | |
122 | int i; | |
123 | ||
124 | for (i = 0; i < count; i++) { | |
125 | if (!pins[i].pin) { | |
126 | printk(KERN_ERR "No name for pin %d\n", i); | |
127 | return -EINVAL; | |
128 | } | |
129 | if (!pins[i].mask) { | |
130 | printk(KERN_ERR "No mask for pin %d (%s)\n", i, | |
131 | pins[i].pin); | |
132 | return -EINVAL; | |
133 | } | |
134 | ||
135 | INIT_LIST_HEAD(&pins[i].list); | |
136 | list_add(&(pins[i].list), &jack->pins); | |
137 | } | |
138 | ||
139 | /* Update to reflect the last reported status; canned jack | |
140 | * implementations are likely to set their state before the | |
141 | * card has an opportunity to associate pins. | |
142 | */ | |
143 | snd_soc_jack_report(jack, 0, 0); | |
144 | ||
145 | return 0; | |
146 | } | |
147 | EXPORT_SYMBOL_GPL(snd_soc_jack_add_pins); | |
ec67624d | 148 | |
d5021ec9 MB |
149 | /** |
150 | * snd_soc_jack_notifier_register - Register a notifier for jack status | |
151 | * | |
152 | * @jack: ASoC jack | |
153 | * @nb: Notifier block to register | |
154 | * | |
155 | * Register for notification of the current status of the jack. Note | |
156 | * that it is not possible to report additional jack events in the | |
157 | * callback from the notifier, this is intended to support | |
158 | * applications such as enabling electrical detection only when a | |
159 | * mechanical detection event has occurred. | |
160 | */ | |
161 | void snd_soc_jack_notifier_register(struct snd_soc_jack *jack, | |
162 | struct notifier_block *nb) | |
163 | { | |
164 | blocking_notifier_chain_register(&jack->notifier, nb); | |
165 | } | |
166 | EXPORT_SYMBOL_GPL(snd_soc_jack_notifier_register); | |
167 | ||
168 | /** | |
169 | * snd_soc_jack_notifier_unregister - Unregister a notifier for jack status | |
170 | * | |
171 | * @jack: ASoC jack | |
172 | * @nb: Notifier block to unregister | |
173 | * | |
174 | * Stop notifying for status changes. | |
175 | */ | |
176 | void snd_soc_jack_notifier_unregister(struct snd_soc_jack *jack, | |
177 | struct notifier_block *nb) | |
178 | { | |
179 | blocking_notifier_chain_unregister(&jack->notifier, nb); | |
180 | } | |
181 | EXPORT_SYMBOL_GPL(snd_soc_jack_notifier_unregister); | |
182 | ||
ec67624d LCM |
183 | #ifdef CONFIG_GPIOLIB |
184 | /* gpio detect */ | |
26bd7b49 | 185 | static void snd_soc_jack_gpio_detect(struct snd_soc_jack_gpio *gpio) |
ec67624d LCM |
186 | { |
187 | struct snd_soc_jack *jack = gpio->jack; | |
188 | int enable; | |
189 | int report; | |
190 | ||
ec67624d LCM |
191 | enable = gpio_get_value(gpio->gpio); |
192 | if (gpio->invert) | |
193 | enable = !enable; | |
194 | ||
195 | if (enable) | |
196 | report = gpio->report; | |
197 | else | |
198 | report = 0; | |
199 | ||
c871a053 JS |
200 | if (gpio->jack_status_check) |
201 | report = gpio->jack_status_check(); | |
202 | ||
ec67624d LCM |
203 | snd_soc_jack_report(jack, report, gpio->report); |
204 | } | |
205 | ||
206 | /* irq handler for gpio pin */ | |
207 | static irqreturn_t gpio_handler(int irq, void *data) | |
208 | { | |
209 | struct snd_soc_jack_gpio *gpio = data; | |
210 | ||
4c14d78e MB |
211 | schedule_delayed_work(&gpio->work, |
212 | msecs_to_jiffies(gpio->debounce_time)); | |
ec67624d LCM |
213 | |
214 | return IRQ_HANDLED; | |
215 | } | |
216 | ||
217 | /* gpio work */ | |
218 | static void gpio_work(struct work_struct *work) | |
219 | { | |
220 | struct snd_soc_jack_gpio *gpio; | |
221 | ||
4c14d78e | 222 | gpio = container_of(work, struct snd_soc_jack_gpio, work.work); |
ec67624d LCM |
223 | snd_soc_jack_gpio_detect(gpio); |
224 | } | |
225 | ||
226 | /** | |
227 | * snd_soc_jack_add_gpios - Associate GPIO pins with an ASoC jack | |
228 | * | |
229 | * @jack: ASoC jack | |
230 | * @count: number of pins | |
231 | * @gpios: array of gpio pins | |
232 | * | |
233 | * This function will request gpio, set data direction and request irq | |
234 | * for each gpio in the array. | |
235 | */ | |
236 | int snd_soc_jack_add_gpios(struct snd_soc_jack *jack, int count, | |
237 | struct snd_soc_jack_gpio *gpios) | |
238 | { | |
239 | int i, ret; | |
240 | ||
241 | for (i = 0; i < count; i++) { | |
242 | if (!gpio_is_valid(gpios[i].gpio)) { | |
243 | printk(KERN_ERR "Invalid gpio %d\n", | |
244 | gpios[i].gpio); | |
245 | ret = -EINVAL; | |
246 | goto undo; | |
247 | } | |
248 | if (!gpios[i].name) { | |
249 | printk(KERN_ERR "No name for gpio %d\n", | |
250 | gpios[i].gpio); | |
251 | ret = -EINVAL; | |
252 | goto undo; | |
253 | } | |
254 | ||
255 | ret = gpio_request(gpios[i].gpio, gpios[i].name); | |
256 | if (ret) | |
257 | goto undo; | |
258 | ||
259 | ret = gpio_direction_input(gpios[i].gpio); | |
260 | if (ret) | |
261 | goto err; | |
262 | ||
4c14d78e | 263 | INIT_DELAYED_WORK(&gpios[i].work, gpio_work); |
b8e22c1f LPC |
264 | gpios[i].jack = jack; |
265 | ||
ec67624d LCM |
266 | ret = request_irq(gpio_to_irq(gpios[i].gpio), |
267 | gpio_handler, | |
268 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, | |
f0fba2ad | 269 | jack->codec->dev->driver->name, |
ec67624d LCM |
270 | &gpios[i]); |
271 | if (ret) | |
272 | goto err; | |
273 | ||
178b699c JK |
274 | #ifdef CONFIG_GPIO_SYSFS |
275 | /* Expose GPIO value over sysfs for diagnostic purposes */ | |
276 | gpio_export(gpios[i].gpio, false); | |
277 | #endif | |
278 | ||
178b699c JK |
279 | /* Update initial jack status */ |
280 | snd_soc_jack_gpio_detect(&gpios[i]); | |
ec67624d LCM |
281 | } |
282 | ||
283 | return 0; | |
284 | ||
285 | err: | |
286 | gpio_free(gpios[i].gpio); | |
287 | undo: | |
288 | snd_soc_jack_free_gpios(jack, i, gpios); | |
289 | ||
290 | return ret; | |
291 | } | |
292 | EXPORT_SYMBOL_GPL(snd_soc_jack_add_gpios); | |
293 | ||
294 | /** | |
295 | * snd_soc_jack_free_gpios - Release GPIO pins' resources of an ASoC jack | |
296 | * | |
297 | * @jack: ASoC jack | |
298 | * @count: number of pins | |
299 | * @gpios: array of gpio pins | |
300 | * | |
301 | * Release gpio and irq resources for gpio pins associated with an ASoC jack. | |
302 | */ | |
303 | void snd_soc_jack_free_gpios(struct snd_soc_jack *jack, int count, | |
304 | struct snd_soc_jack_gpio *gpios) | |
305 | { | |
306 | int i; | |
307 | ||
308 | for (i = 0; i < count; i++) { | |
178b699c JK |
309 | #ifdef CONFIG_GPIO_SYSFS |
310 | gpio_unexport(gpios[i].gpio); | |
311 | #endif | |
ec67624d | 312 | free_irq(gpio_to_irq(gpios[i].gpio), &gpios[i]); |
4c14d78e | 313 | cancel_delayed_work_sync(&gpios[i].work); |
ec67624d LCM |
314 | gpio_free(gpios[i].gpio); |
315 | gpios[i].jack = NULL; | |
316 | } | |
317 | } | |
318 | EXPORT_SYMBOL_GPL(snd_soc_jack_free_gpios); | |
319 | #endif /* CONFIG_GPIOLIB */ |