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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 | */ | |
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 | ||
6627a653 | 41 | return snd_jack_new(card->codec->card, id, type, &jack->jack); |
8a2cd618 MB |
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 | { | |
6627a653 | 61 | struct snd_soc_codec *codec = jack->card->codec; |
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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; | |
178b699c | 76 | jack->status |= status & mask; |
8a2cd618 | 77 | |
178b699c JK |
78 | /* The DAPM sync is expensive enough to be worth skipping. |
79 | * However, empty mask means pin synchronization is desired. */ | |
80 | if (mask && (jack->status == oldstatus)) | |
8a2cd618 MB |
81 | goto out; |
82 | ||
83 | list_for_each_entry(pin, &jack->pins, list) { | |
178b699c | 84 | enable = pin->mask & jack->status; |
8a2cd618 MB |
85 | |
86 | if (pin->invert) | |
87 | enable = !enable; | |
88 | ||
89 | if (enable) | |
90 | snd_soc_dapm_enable_pin(codec, pin->pin); | |
91 | else | |
92 | snd_soc_dapm_disable_pin(codec, pin->pin); | |
93 | } | |
94 | ||
95 | snd_soc_dapm_sync(codec); | |
96 | ||
97 | snd_jack_report(jack->jack, status); | |
98 | ||
99 | out: | |
100 | mutex_unlock(&codec->mutex); | |
101 | } | |
102 | EXPORT_SYMBOL_GPL(snd_soc_jack_report); | |
103 | ||
104 | /** | |
105 | * snd_soc_jack_add_pins - Associate DAPM pins with an ASoC jack | |
106 | * | |
107 | * @jack: ASoC jack | |
108 | * @count: Number of pins | |
109 | * @pins: Array of pins | |
110 | * | |
111 | * After this function has been called the DAPM pins specified in the | |
112 | * pins array will have their status updated to reflect the current | |
113 | * state of the jack whenever the jack status is updated. | |
114 | */ | |
115 | int snd_soc_jack_add_pins(struct snd_soc_jack *jack, int count, | |
116 | struct snd_soc_jack_pin *pins) | |
117 | { | |
118 | int i; | |
119 | ||
120 | for (i = 0; i < count; i++) { | |
121 | if (!pins[i].pin) { | |
122 | printk(KERN_ERR "No name for pin %d\n", i); | |
123 | return -EINVAL; | |
124 | } | |
125 | if (!pins[i].mask) { | |
126 | printk(KERN_ERR "No mask for pin %d (%s)\n", i, | |
127 | pins[i].pin); | |
128 | return -EINVAL; | |
129 | } | |
130 | ||
131 | INIT_LIST_HEAD(&pins[i].list); | |
132 | list_add(&(pins[i].list), &jack->pins); | |
133 | } | |
134 | ||
135 | /* Update to reflect the last reported status; canned jack | |
136 | * implementations are likely to set their state before the | |
137 | * card has an opportunity to associate pins. | |
138 | */ | |
139 | snd_soc_jack_report(jack, 0, 0); | |
140 | ||
141 | return 0; | |
142 | } | |
143 | EXPORT_SYMBOL_GPL(snd_soc_jack_add_pins); | |
ec67624d LCM |
144 | |
145 | #ifdef CONFIG_GPIOLIB | |
146 | /* gpio detect */ | |
26bd7b49 | 147 | static void snd_soc_jack_gpio_detect(struct snd_soc_jack_gpio *gpio) |
ec67624d LCM |
148 | { |
149 | struct snd_soc_jack *jack = gpio->jack; | |
150 | int enable; | |
151 | int report; | |
152 | ||
153 | if (gpio->debounce_time > 0) | |
154 | mdelay(gpio->debounce_time); | |
155 | ||
156 | enable = gpio_get_value(gpio->gpio); | |
157 | if (gpio->invert) | |
158 | enable = !enable; | |
159 | ||
160 | if (enable) | |
161 | report = gpio->report; | |
162 | else | |
163 | report = 0; | |
164 | ||
165 | snd_soc_jack_report(jack, report, gpio->report); | |
166 | } | |
167 | ||
168 | /* irq handler for gpio pin */ | |
169 | static irqreturn_t gpio_handler(int irq, void *data) | |
170 | { | |
171 | struct snd_soc_jack_gpio *gpio = data; | |
172 | ||
173 | schedule_work(&gpio->work); | |
174 | ||
175 | return IRQ_HANDLED; | |
176 | } | |
177 | ||
178 | /* gpio work */ | |
179 | static void gpio_work(struct work_struct *work) | |
180 | { | |
181 | struct snd_soc_jack_gpio *gpio; | |
182 | ||
183 | gpio = container_of(work, struct snd_soc_jack_gpio, work); | |
184 | snd_soc_jack_gpio_detect(gpio); | |
185 | } | |
186 | ||
187 | /** | |
188 | * snd_soc_jack_add_gpios - Associate GPIO pins with an ASoC jack | |
189 | * | |
190 | * @jack: ASoC jack | |
191 | * @count: number of pins | |
192 | * @gpios: array of gpio pins | |
193 | * | |
194 | * This function will request gpio, set data direction and request irq | |
195 | * for each gpio in the array. | |
196 | */ | |
197 | int snd_soc_jack_add_gpios(struct snd_soc_jack *jack, int count, | |
198 | struct snd_soc_jack_gpio *gpios) | |
199 | { | |
200 | int i, ret; | |
201 | ||
202 | for (i = 0; i < count; i++) { | |
203 | if (!gpio_is_valid(gpios[i].gpio)) { | |
204 | printk(KERN_ERR "Invalid gpio %d\n", | |
205 | gpios[i].gpio); | |
206 | ret = -EINVAL; | |
207 | goto undo; | |
208 | } | |
209 | if (!gpios[i].name) { | |
210 | printk(KERN_ERR "No name for gpio %d\n", | |
211 | gpios[i].gpio); | |
212 | ret = -EINVAL; | |
213 | goto undo; | |
214 | } | |
215 | ||
216 | ret = gpio_request(gpios[i].gpio, gpios[i].name); | |
217 | if (ret) | |
218 | goto undo; | |
219 | ||
220 | ret = gpio_direction_input(gpios[i].gpio); | |
221 | if (ret) | |
222 | goto err; | |
223 | ||
b8e22c1f LPC |
224 | INIT_WORK(&gpios[i].work, gpio_work); |
225 | gpios[i].jack = jack; | |
226 | ||
ec67624d LCM |
227 | ret = request_irq(gpio_to_irq(gpios[i].gpio), |
228 | gpio_handler, | |
229 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, | |
230 | jack->card->dev->driver->name, | |
231 | &gpios[i]); | |
232 | if (ret) | |
233 | goto err; | |
234 | ||
178b699c JK |
235 | #ifdef CONFIG_GPIO_SYSFS |
236 | /* Expose GPIO value over sysfs for diagnostic purposes */ | |
237 | gpio_export(gpios[i].gpio, false); | |
238 | #endif | |
239 | ||
178b699c JK |
240 | /* Update initial jack status */ |
241 | snd_soc_jack_gpio_detect(&gpios[i]); | |
ec67624d LCM |
242 | } |
243 | ||
244 | return 0; | |
245 | ||
246 | err: | |
247 | gpio_free(gpios[i].gpio); | |
248 | undo: | |
249 | snd_soc_jack_free_gpios(jack, i, gpios); | |
250 | ||
251 | return ret; | |
252 | } | |
253 | EXPORT_SYMBOL_GPL(snd_soc_jack_add_gpios); | |
254 | ||
255 | /** | |
256 | * snd_soc_jack_free_gpios - Release GPIO pins' resources of an ASoC jack | |
257 | * | |
258 | * @jack: ASoC jack | |
259 | * @count: number of pins | |
260 | * @gpios: array of gpio pins | |
261 | * | |
262 | * Release gpio and irq resources for gpio pins associated with an ASoC jack. | |
263 | */ | |
264 | void snd_soc_jack_free_gpios(struct snd_soc_jack *jack, int count, | |
265 | struct snd_soc_jack_gpio *gpios) | |
266 | { | |
267 | int i; | |
268 | ||
269 | for (i = 0; i < count; i++) { | |
178b699c JK |
270 | #ifdef CONFIG_GPIO_SYSFS |
271 | gpio_unexport(gpios[i].gpio); | |
272 | #endif | |
ec67624d LCM |
273 | free_irq(gpio_to_irq(gpios[i].gpio), &gpios[i]); |
274 | gpio_free(gpios[i].gpio); | |
275 | gpios[i].jack = NULL; | |
276 | } | |
277 | } | |
278 | EXPORT_SYMBOL_GPL(snd_soc_jack_free_gpios); | |
279 | #endif /* CONFIG_GPIOLIB */ |