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1 | /* | |
2 | * soc-ac97.c -- ALSA SoC Audio Layer AC97 support | |
3 | * | |
4 | * Copyright 2005 Wolfson Microelectronics PLC. | |
5 | * Copyright 2005 Openedhand Ltd. | |
6 | * Copyright (C) 2010 Slimlogic Ltd. | |
7 | * Copyright (C) 2010 Texas Instruments Inc. | |
8 | * | |
9 | * Author: Liam Girdwood <lrg@slimlogic.co.uk> | |
10 | * with code, comments and ideas from :- | |
11 | * Richard Purdie <richard@openedhand.com> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify it | |
14 | * under the terms of the GNU General Public License as published by the | |
15 | * Free Software Foundation; either version 2 of the License, or (at your | |
16 | * option) any later version. | |
17 | */ | |
18 | ||
19 | #include <linux/ctype.h> | |
20 | #include <linux/delay.h> | |
21 | #include <linux/export.h> | |
22 | #include <linux/gpio.h> | |
23 | #include <linux/gpio/driver.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/of_gpio.h> | |
26 | #include <linux/of.h> | |
27 | #include <linux/pinctrl/consumer.h> | |
28 | #include <linux/slab.h> | |
29 | #include <sound/ac97_codec.h> | |
30 | #include <sound/soc.h> | |
31 | ||
32 | struct snd_ac97_reset_cfg { | |
33 | struct pinctrl *pctl; | |
34 | struct pinctrl_state *pstate_reset; | |
35 | struct pinctrl_state *pstate_warm_reset; | |
36 | struct pinctrl_state *pstate_run; | |
37 | int gpio_sdata; | |
38 | int gpio_sync; | |
39 | int gpio_reset; | |
40 | }; | |
41 | ||
42 | struct snd_ac97_gpio_priv { | |
43 | #ifdef CONFIG_GPIOLIB | |
44 | struct gpio_chip gpio_chip; | |
45 | #endif | |
46 | unsigned int gpios_set; | |
47 | struct snd_soc_codec *codec; | |
48 | }; | |
49 | ||
50 | static struct snd_ac97_bus soc_ac97_bus = { | |
51 | .ops = NULL, /* Gets initialized in snd_soc_set_ac97_ops() */ | |
52 | }; | |
53 | ||
54 | static void soc_ac97_device_release(struct device *dev) | |
55 | { | |
56 | kfree(to_ac97_t(dev)); | |
57 | } | |
58 | ||
59 | #ifdef CONFIG_GPIOLIB | |
60 | static inline struct snd_soc_codec *gpio_to_codec(struct gpio_chip *chip) | |
61 | { | |
62 | struct snd_ac97_gpio_priv *gpio_priv = gpiochip_get_data(chip); | |
63 | ||
64 | return gpio_priv->codec; | |
65 | } | |
66 | ||
67 | static int snd_soc_ac97_gpio_request(struct gpio_chip *chip, unsigned offset) | |
68 | { | |
69 | if (offset >= AC97_NUM_GPIOS) | |
70 | return -EINVAL; | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
75 | static int snd_soc_ac97_gpio_direction_in(struct gpio_chip *chip, | |
76 | unsigned offset) | |
77 | { | |
78 | struct snd_soc_codec *codec = gpio_to_codec(chip); | |
79 | ||
80 | dev_dbg(codec->dev, "set gpio %d to output\n", offset); | |
81 | return snd_soc_update_bits(codec, AC97_GPIO_CFG, | |
82 | 1 << offset, 1 << offset); | |
83 | } | |
84 | ||
85 | static int snd_soc_ac97_gpio_get(struct gpio_chip *chip, unsigned offset) | |
86 | { | |
87 | struct snd_soc_codec *codec = gpio_to_codec(chip); | |
88 | int ret; | |
89 | ||
90 | ret = snd_soc_read(codec, AC97_GPIO_STATUS); | |
91 | dev_dbg(codec->dev, "get gpio %d : %d\n", offset, | |
92 | ret < 0 ? ret : ret & (1 << offset)); | |
93 | ||
94 | return ret < 0 ? ret : !!(ret & (1 << offset)); | |
95 | } | |
96 | ||
97 | static void snd_soc_ac97_gpio_set(struct gpio_chip *chip, unsigned offset, | |
98 | int value) | |
99 | { | |
100 | struct snd_ac97_gpio_priv *gpio_priv = gpiochip_get_data(chip); | |
101 | struct snd_soc_codec *codec = gpio_to_codec(chip); | |
102 | ||
103 | gpio_priv->gpios_set &= ~(1 << offset); | |
104 | gpio_priv->gpios_set |= (!!value) << offset; | |
105 | snd_soc_write(codec, AC97_GPIO_STATUS, gpio_priv->gpios_set); | |
106 | dev_dbg(codec->dev, "set gpio %d to %d\n", offset, !!value); | |
107 | } | |
108 | ||
109 | static int snd_soc_ac97_gpio_direction_out(struct gpio_chip *chip, | |
110 | unsigned offset, int value) | |
111 | { | |
112 | struct snd_soc_codec *codec = gpio_to_codec(chip); | |
113 | ||
114 | dev_dbg(codec->dev, "set gpio %d to output\n", offset); | |
115 | snd_soc_ac97_gpio_set(chip, offset, value); | |
116 | return snd_soc_update_bits(codec, AC97_GPIO_CFG, 1 << offset, 0); | |
117 | } | |
118 | ||
119 | static const struct gpio_chip snd_soc_ac97_gpio_chip = { | |
120 | .label = "snd_soc_ac97", | |
121 | .owner = THIS_MODULE, | |
122 | .request = snd_soc_ac97_gpio_request, | |
123 | .direction_input = snd_soc_ac97_gpio_direction_in, | |
124 | .get = snd_soc_ac97_gpio_get, | |
125 | .direction_output = snd_soc_ac97_gpio_direction_out, | |
126 | .set = snd_soc_ac97_gpio_set, | |
127 | .can_sleep = 1, | |
128 | }; | |
129 | ||
130 | static int snd_soc_ac97_init_gpio(struct snd_ac97 *ac97, | |
131 | struct snd_soc_codec *codec) | |
132 | { | |
133 | struct snd_ac97_gpio_priv *gpio_priv; | |
134 | int ret; | |
135 | ||
136 | gpio_priv = devm_kzalloc(codec->dev, sizeof(*gpio_priv), GFP_KERNEL); | |
137 | if (!gpio_priv) | |
138 | return -ENOMEM; | |
139 | ac97->gpio_priv = gpio_priv; | |
140 | gpio_priv->codec = codec; | |
141 | gpio_priv->gpio_chip = snd_soc_ac97_gpio_chip; | |
142 | gpio_priv->gpio_chip.ngpio = AC97_NUM_GPIOS; | |
143 | gpio_priv->gpio_chip.parent = codec->dev; | |
144 | gpio_priv->gpio_chip.base = -1; | |
145 | ||
146 | ret = gpiochip_add_data(&gpio_priv->gpio_chip, gpio_priv); | |
147 | if (ret != 0) | |
148 | dev_err(codec->dev, "Failed to add GPIOs: %d\n", ret); | |
149 | return ret; | |
150 | } | |
151 | ||
152 | static void snd_soc_ac97_free_gpio(struct snd_ac97 *ac97) | |
153 | { | |
154 | gpiochip_remove(&ac97->gpio_priv->gpio_chip); | |
155 | } | |
156 | #else | |
157 | static int snd_soc_ac97_init_gpio(struct snd_ac97 *ac97, | |
158 | struct snd_soc_codec *codec) | |
159 | { | |
160 | return 0; | |
161 | } | |
162 | ||
163 | static void snd_soc_ac97_free_gpio(struct snd_ac97 *ac97) | |
164 | { | |
165 | } | |
166 | #endif | |
167 | ||
168 | /** | |
169 | * snd_soc_alloc_ac97_codec() - Allocate new a AC'97 device | |
170 | * @codec: The CODEC for which to create the AC'97 device | |
171 | * | |
172 | * Allocated a new snd_ac97 device and intializes it, but does not yet register | |
173 | * it. The caller is responsible to either call device_add(&ac97->dev) to | |
174 | * register the device, or to call put_device(&ac97->dev) to free the device. | |
175 | * | |
176 | * Returns: A snd_ac97 device or a PTR_ERR in case of an error. | |
177 | */ | |
178 | struct snd_ac97 *snd_soc_alloc_ac97_codec(struct snd_soc_codec *codec) | |
179 | { | |
180 | struct snd_ac97 *ac97; | |
181 | ||
182 | ac97 = kzalloc(sizeof(struct snd_ac97), GFP_KERNEL); | |
183 | if (ac97 == NULL) | |
184 | return ERR_PTR(-ENOMEM); | |
185 | ||
186 | ac97->bus = &soc_ac97_bus; | |
187 | ac97->num = 0; | |
188 | ||
189 | ac97->dev.bus = &ac97_bus_type; | |
190 | ac97->dev.parent = codec->component.card->dev; | |
191 | ac97->dev.release = soc_ac97_device_release; | |
192 | ||
193 | dev_set_name(&ac97->dev, "%d-%d:%s", | |
194 | codec->component.card->snd_card->number, 0, | |
195 | codec->component.name); | |
196 | ||
197 | device_initialize(&ac97->dev); | |
198 | ||
199 | return ac97; | |
200 | } | |
201 | EXPORT_SYMBOL(snd_soc_alloc_ac97_codec); | |
202 | ||
203 | /** | |
204 | * snd_soc_new_ac97_codec - initailise AC97 device | |
205 | * @codec: audio codec | |
206 | * @id: The expected device ID | |
207 | * @id_mask: Mask that is applied to the device ID before comparing with @id | |
208 | * | |
209 | * Initialises AC97 codec resources for use by ad-hoc devices only. | |
210 | * | |
211 | * If @id is not 0 this function will reset the device, then read the ID from | |
212 | * the device and check if it matches the expected ID. If it doesn't match an | |
213 | * error will be returned and device will not be registered. | |
214 | * | |
215 | * Returns: A PTR_ERR() on failure or a valid snd_ac97 struct on success. | |
216 | */ | |
217 | struct snd_ac97 *snd_soc_new_ac97_codec(struct snd_soc_codec *codec, | |
218 | unsigned int id, unsigned int id_mask) | |
219 | { | |
220 | struct snd_ac97 *ac97; | |
221 | int ret; | |
222 | ||
223 | ac97 = snd_soc_alloc_ac97_codec(codec); | |
224 | if (IS_ERR(ac97)) | |
225 | return ac97; | |
226 | ||
227 | if (id) { | |
228 | ret = snd_ac97_reset(ac97, false, id, id_mask); | |
229 | if (ret < 0) { | |
230 | dev_err(codec->dev, "Failed to reset AC97 device: %d\n", | |
231 | ret); | |
232 | goto err_put_device; | |
233 | } | |
234 | } | |
235 | ||
236 | ret = device_add(&ac97->dev); | |
237 | if (ret) | |
238 | goto err_put_device; | |
239 | ||
240 | ret = snd_soc_ac97_init_gpio(ac97, codec); | |
241 | if (ret) | |
242 | goto err_put_device; | |
243 | ||
244 | return ac97; | |
245 | ||
246 | err_put_device: | |
247 | put_device(&ac97->dev); | |
248 | return ERR_PTR(ret); | |
249 | } | |
250 | EXPORT_SYMBOL_GPL(snd_soc_new_ac97_codec); | |
251 | ||
252 | /** | |
253 | * snd_soc_free_ac97_codec - free AC97 codec device | |
254 | * @codec: audio codec | |
255 | * | |
256 | * Frees AC97 codec device resources. | |
257 | */ | |
258 | void snd_soc_free_ac97_codec(struct snd_ac97 *ac97) | |
259 | { | |
260 | snd_soc_ac97_free_gpio(ac97); | |
261 | device_del(&ac97->dev); | |
262 | ac97->bus = NULL; | |
263 | put_device(&ac97->dev); | |
264 | } | |
265 | EXPORT_SYMBOL_GPL(snd_soc_free_ac97_codec); | |
266 | ||
267 | static struct snd_ac97_reset_cfg snd_ac97_rst_cfg; | |
268 | ||
269 | static void snd_soc_ac97_warm_reset(struct snd_ac97 *ac97) | |
270 | { | |
271 | struct pinctrl *pctl = snd_ac97_rst_cfg.pctl; | |
272 | ||
273 | pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_warm_reset); | |
274 | ||
275 | gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 1); | |
276 | ||
277 | udelay(10); | |
278 | ||
279 | gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0); | |
280 | ||
281 | pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run); | |
282 | msleep(2); | |
283 | } | |
284 | ||
285 | static void snd_soc_ac97_reset(struct snd_ac97 *ac97) | |
286 | { | |
287 | struct pinctrl *pctl = snd_ac97_rst_cfg.pctl; | |
288 | ||
289 | pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_reset); | |
290 | ||
291 | gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0); | |
292 | gpio_direction_output(snd_ac97_rst_cfg.gpio_sdata, 0); | |
293 | gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 0); | |
294 | ||
295 | udelay(10); | |
296 | ||
297 | gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 1); | |
298 | ||
299 | pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run); | |
300 | msleep(2); | |
301 | } | |
302 | ||
303 | static int snd_soc_ac97_parse_pinctl(struct device *dev, | |
304 | struct snd_ac97_reset_cfg *cfg) | |
305 | { | |
306 | struct pinctrl *p; | |
307 | struct pinctrl_state *state; | |
308 | int gpio; | |
309 | int ret; | |
310 | ||
311 | p = devm_pinctrl_get(dev); | |
312 | if (IS_ERR(p)) { | |
313 | dev_err(dev, "Failed to get pinctrl\n"); | |
314 | return PTR_ERR(p); | |
315 | } | |
316 | cfg->pctl = p; | |
317 | ||
318 | state = pinctrl_lookup_state(p, "ac97-reset"); | |
319 | if (IS_ERR(state)) { | |
320 | dev_err(dev, "Can't find pinctrl state ac97-reset\n"); | |
321 | return PTR_ERR(state); | |
322 | } | |
323 | cfg->pstate_reset = state; | |
324 | ||
325 | state = pinctrl_lookup_state(p, "ac97-warm-reset"); | |
326 | if (IS_ERR(state)) { | |
327 | dev_err(dev, "Can't find pinctrl state ac97-warm-reset\n"); | |
328 | return PTR_ERR(state); | |
329 | } | |
330 | cfg->pstate_warm_reset = state; | |
331 | ||
332 | state = pinctrl_lookup_state(p, "ac97-running"); | |
333 | if (IS_ERR(state)) { | |
334 | dev_err(dev, "Can't find pinctrl state ac97-running\n"); | |
335 | return PTR_ERR(state); | |
336 | } | |
337 | cfg->pstate_run = state; | |
338 | ||
339 | gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 0); | |
340 | if (gpio < 0) { | |
341 | dev_err(dev, "Can't find ac97-sync gpio\n"); | |
342 | return gpio; | |
343 | } | |
344 | ret = devm_gpio_request(dev, gpio, "AC97 link sync"); | |
345 | if (ret) { | |
346 | dev_err(dev, "Failed requesting ac97-sync gpio\n"); | |
347 | return ret; | |
348 | } | |
349 | cfg->gpio_sync = gpio; | |
350 | ||
351 | gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 1); | |
352 | if (gpio < 0) { | |
353 | dev_err(dev, "Can't find ac97-sdata gpio %d\n", gpio); | |
354 | return gpio; | |
355 | } | |
356 | ret = devm_gpio_request(dev, gpio, "AC97 link sdata"); | |
357 | if (ret) { | |
358 | dev_err(dev, "Failed requesting ac97-sdata gpio\n"); | |
359 | return ret; | |
360 | } | |
361 | cfg->gpio_sdata = gpio; | |
362 | ||
363 | gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 2); | |
364 | if (gpio < 0) { | |
365 | dev_err(dev, "Can't find ac97-reset gpio\n"); | |
366 | return gpio; | |
367 | } | |
368 | ret = devm_gpio_request(dev, gpio, "AC97 link reset"); | |
369 | if (ret) { | |
370 | dev_err(dev, "Failed requesting ac97-reset gpio\n"); | |
371 | return ret; | |
372 | } | |
373 | cfg->gpio_reset = gpio; | |
374 | ||
375 | return 0; | |
376 | } | |
377 | ||
378 | struct snd_ac97_bus_ops *soc_ac97_ops; | |
379 | EXPORT_SYMBOL_GPL(soc_ac97_ops); | |
380 | ||
381 | int snd_soc_set_ac97_ops(struct snd_ac97_bus_ops *ops) | |
382 | { | |
383 | if (ops == soc_ac97_ops) | |
384 | return 0; | |
385 | ||
386 | if (soc_ac97_ops && ops) | |
387 | return -EBUSY; | |
388 | ||
389 | soc_ac97_ops = ops; | |
390 | soc_ac97_bus.ops = ops; | |
391 | ||
392 | return 0; | |
393 | } | |
394 | EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops); | |
395 | ||
396 | /** | |
397 | * snd_soc_set_ac97_ops_of_reset - Set ac97 ops with generic ac97 reset functions | |
398 | * | |
399 | * This function sets the reset and warm_reset properties of ops and parses | |
400 | * the device node of pdev to get pinctrl states and gpio numbers to use. | |
401 | */ | |
402 | int snd_soc_set_ac97_ops_of_reset(struct snd_ac97_bus_ops *ops, | |
403 | struct platform_device *pdev) | |
404 | { | |
405 | struct device *dev = &pdev->dev; | |
406 | struct snd_ac97_reset_cfg cfg; | |
407 | int ret; | |
408 | ||
409 | ret = snd_soc_ac97_parse_pinctl(dev, &cfg); | |
410 | if (ret) | |
411 | return ret; | |
412 | ||
413 | ret = snd_soc_set_ac97_ops(ops); | |
414 | if (ret) | |
415 | return ret; | |
416 | ||
417 | ops->warm_reset = snd_soc_ac97_warm_reset; | |
418 | ops->reset = snd_soc_ac97_reset; | |
419 | ||
420 | snd_ac97_rst_cfg = cfg; | |
421 | return 0; | |
422 | } | |
423 | EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops_of_reset); |