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336b8423 LPC |
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> | |
9bf5c3d1 | 23 | #include <linux/gpio/driver.h> |
336b8423 LPC |
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 | ||
9bf5c3d1 RJ |
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 | ||
eda1a701 LPC |
50 | static struct snd_ac97_bus soc_ac97_bus = { |
51 | .ops = NULL, /* Gets initialized in snd_soc_set_ac97_ops() */ | |
52 | }; | |
53 | ||
336b8423 LPC |
54 | static void soc_ac97_device_release(struct device *dev) |
55 | { | |
56 | kfree(to_ac97_t(dev)); | |
57 | } | |
58 | ||
9bf5c3d1 RJ |
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 = | |
63 | container_of(chip, struct snd_ac97_gpio_priv, gpio_chip); | |
64 | ||
65 | return gpio_priv->codec; | |
66 | } | |
67 | ||
68 | static int snd_soc_ac97_gpio_request(struct gpio_chip *chip, unsigned offset) | |
69 | { | |
70 | if (offset >= AC97_NUM_GPIOS) | |
71 | return -EINVAL; | |
72 | ||
73 | return 0; | |
74 | } | |
75 | ||
76 | static int snd_soc_ac97_gpio_direction_in(struct gpio_chip *chip, | |
77 | unsigned offset) | |
78 | { | |
79 | struct snd_soc_codec *codec = gpio_to_codec(chip); | |
80 | ||
81 | dev_dbg(codec->dev, "set gpio %d to output\n", offset); | |
82 | return snd_soc_update_bits(codec, AC97_GPIO_CFG, | |
83 | 1 << offset, 1 << offset); | |
84 | } | |
85 | ||
86 | static int snd_soc_ac97_gpio_get(struct gpio_chip *chip, unsigned offset) | |
87 | { | |
88 | struct snd_soc_codec *codec = gpio_to_codec(chip); | |
89 | int ret; | |
90 | ||
91 | ret = snd_soc_read(codec, AC97_GPIO_STATUS); | |
92 | dev_dbg(codec->dev, "get gpio %d : %d\n", offset, | |
93 | ret < 0 ? ret : ret & (1 << offset)); | |
94 | ||
34015f5e | 95 | return ret < 0 ? ret : !!(ret & (1 << offset)); |
9bf5c3d1 RJ |
96 | } |
97 | ||
98 | static void snd_soc_ac97_gpio_set(struct gpio_chip *chip, unsigned offset, | |
99 | int value) | |
100 | { | |
101 | struct snd_ac97_gpio_priv *gpio_priv = | |
102 | container_of(chip, struct snd_ac97_gpio_priv, gpio_chip); | |
103 | struct snd_soc_codec *codec = gpio_to_codec(chip); | |
104 | ||
105 | gpio_priv->gpios_set &= ~(1 << offset); | |
106 | gpio_priv->gpios_set |= (!!value) << offset; | |
107 | snd_soc_write(codec, AC97_GPIO_STATUS, gpio_priv->gpios_set); | |
108 | dev_dbg(codec->dev, "set gpio %d to %d\n", offset, !!value); | |
109 | } | |
110 | ||
111 | static int snd_soc_ac97_gpio_direction_out(struct gpio_chip *chip, | |
112 | unsigned offset, int value) | |
113 | { | |
114 | struct snd_soc_codec *codec = gpio_to_codec(chip); | |
115 | ||
116 | dev_dbg(codec->dev, "set gpio %d to output\n", offset); | |
117 | snd_soc_ac97_gpio_set(chip, offset, value); | |
118 | return snd_soc_update_bits(codec, AC97_GPIO_CFG, 1 << offset, 0); | |
119 | } | |
120 | ||
121 | static struct gpio_chip snd_soc_ac97_gpio_chip = { | |
122 | .label = "snd_soc_ac97", | |
123 | .owner = THIS_MODULE, | |
124 | .request = snd_soc_ac97_gpio_request, | |
125 | .direction_input = snd_soc_ac97_gpio_direction_in, | |
126 | .get = snd_soc_ac97_gpio_get, | |
127 | .direction_output = snd_soc_ac97_gpio_direction_out, | |
128 | .set = snd_soc_ac97_gpio_set, | |
129 | .can_sleep = 1, | |
130 | }; | |
131 | ||
132 | static int snd_soc_ac97_init_gpio(struct snd_ac97 *ac97, | |
133 | struct snd_soc_codec *codec) | |
134 | { | |
135 | struct snd_ac97_gpio_priv *gpio_priv; | |
136 | int ret; | |
137 | ||
138 | gpio_priv = devm_kzalloc(codec->dev, sizeof(*gpio_priv), GFP_KERNEL); | |
139 | if (!gpio_priv) | |
140 | return -ENOMEM; | |
141 | ac97->gpio_priv = gpio_priv; | |
142 | gpio_priv->codec = codec; | |
143 | gpio_priv->gpio_chip = snd_soc_ac97_gpio_chip; | |
144 | gpio_priv->gpio_chip.ngpio = AC97_NUM_GPIOS; | |
a1eb9d57 | 145 | gpio_priv->gpio_chip.parent = codec->dev; |
9bf5c3d1 RJ |
146 | gpio_priv->gpio_chip.base = -1; |
147 | ||
148 | ret = gpiochip_add(&gpio_priv->gpio_chip); | |
149 | if (ret != 0) | |
150 | dev_err(codec->dev, "Failed to add GPIOs: %d\n", ret); | |
151 | return ret; | |
152 | } | |
153 | ||
154 | static void snd_soc_ac97_free_gpio(struct snd_ac97 *ac97) | |
155 | { | |
156 | gpiochip_remove(&ac97->gpio_priv->gpio_chip); | |
157 | } | |
158 | #else | |
159 | static int snd_soc_ac97_init_gpio(struct snd_ac97 *ac97, | |
160 | struct snd_soc_codec *codec) | |
161 | { | |
162 | return 0; | |
163 | } | |
164 | ||
165 | static void snd_soc_ac97_free_gpio(struct snd_ac97 *ac97) | |
166 | { | |
167 | } | |
168 | #endif | |
169 | ||
336b8423 | 170 | /** |
47e03941 LPC |
171 | * snd_soc_alloc_ac97_codec() - Allocate new a AC'97 device |
172 | * @codec: The CODEC for which to create the AC'97 device | |
336b8423 | 173 | * |
47e03941 LPC |
174 | * Allocated a new snd_ac97 device and intializes it, but does not yet register |
175 | * it. The caller is responsible to either call device_add(&ac97->dev) to | |
176 | * register the device, or to call put_device(&ac97->dev) to free the device. | |
177 | * | |
178 | * Returns: A snd_ac97 device or a PTR_ERR in case of an error. | |
336b8423 | 179 | */ |
47e03941 | 180 | struct snd_ac97 *snd_soc_alloc_ac97_codec(struct snd_soc_codec *codec) |
336b8423 | 181 | { |
358a8bb5 | 182 | struct snd_ac97 *ac97; |
6794f709 | 183 | |
358a8bb5 LPC |
184 | ac97 = kzalloc(sizeof(struct snd_ac97), GFP_KERNEL); |
185 | if (ac97 == NULL) | |
186 | return ERR_PTR(-ENOMEM); | |
336b8423 | 187 | |
358a8bb5 LPC |
188 | ac97->bus = &soc_ac97_bus; |
189 | ac97->num = 0; | |
6794f709 | 190 | |
358a8bb5 LPC |
191 | ac97->dev.bus = &ac97_bus_type; |
192 | ac97->dev.parent = codec->component.card->dev; | |
193 | ac97->dev.release = soc_ac97_device_release; | |
336b8423 | 194 | |
358a8bb5 | 195 | dev_set_name(&ac97->dev, "%d-%d:%s", |
6794f709 LPC |
196 | codec->component.card->snd_card->number, 0, |
197 | codec->component.name); | |
198 | ||
47e03941 LPC |
199 | device_initialize(&ac97->dev); |
200 | ||
201 | return ac97; | |
202 | } | |
203 | EXPORT_SYMBOL(snd_soc_alloc_ac97_codec); | |
204 | ||
205 | /** | |
206 | * snd_soc_new_ac97_codec - initailise AC97 device | |
207 | * @codec: audio codec | |
7361fbea LPC |
208 | * @id: The expected device ID |
209 | * @id_mask: Mask that is applied to the device ID before comparing with @id | |
47e03941 LPC |
210 | * |
211 | * Initialises AC97 codec resources for use by ad-hoc devices only. | |
7361fbea LPC |
212 | * |
213 | * If @id is not 0 this function will reset the device, then read the ID from | |
214 | * the device and check if it matches the expected ID. If it doesn't match an | |
215 | * error will be returned and device will not be registered. | |
216 | * | |
217 | * Returns: A PTR_ERR() on failure or a valid snd_ac97 struct on success. | |
47e03941 | 218 | */ |
7361fbea LPC |
219 | struct snd_ac97 *snd_soc_new_ac97_codec(struct snd_soc_codec *codec, |
220 | unsigned int id, unsigned int id_mask) | |
47e03941 LPC |
221 | { |
222 | struct snd_ac97 *ac97; | |
223 | int ret; | |
224 | ||
225 | ac97 = snd_soc_alloc_ac97_codec(codec); | |
226 | if (IS_ERR(ac97)) | |
227 | return ac97; | |
228 | ||
7361fbea LPC |
229 | if (id) { |
230 | ret = snd_ac97_reset(ac97, false, id, id_mask); | |
231 | if (ret < 0) { | |
232 | dev_err(codec->dev, "Failed to reset AC97 device: %d\n", | |
233 | ret); | |
234 | goto err_put_device; | |
235 | } | |
358a8bb5 | 236 | } |
336b8423 | 237 | |
7361fbea LPC |
238 | ret = device_add(&ac97->dev); |
239 | if (ret) | |
240 | goto err_put_device; | |
241 | ||
9bf5c3d1 RJ |
242 | ret = snd_soc_ac97_init_gpio(ac97, codec); |
243 | if (ret) | |
244 | goto err_put_device; | |
245 | ||
358a8bb5 | 246 | return ac97; |
7361fbea LPC |
247 | |
248 | err_put_device: | |
249 | put_device(&ac97->dev); | |
250 | return ERR_PTR(ret); | |
336b8423 LPC |
251 | } |
252 | EXPORT_SYMBOL_GPL(snd_soc_new_ac97_codec); | |
253 | ||
254 | /** | |
255 | * snd_soc_free_ac97_codec - free AC97 codec device | |
256 | * @codec: audio codec | |
257 | * | |
258 | * Frees AC97 codec device resources. | |
259 | */ | |
358a8bb5 | 260 | void snd_soc_free_ac97_codec(struct snd_ac97 *ac97) |
336b8423 | 261 | { |
9bf5c3d1 | 262 | snd_soc_ac97_free_gpio(ac97); |
358a8bb5 LPC |
263 | device_del(&ac97->dev); |
264 | ac97->bus = NULL; | |
265 | put_device(&ac97->dev); | |
336b8423 LPC |
266 | } |
267 | EXPORT_SYMBOL_GPL(snd_soc_free_ac97_codec); | |
268 | ||
269 | static struct snd_ac97_reset_cfg snd_ac97_rst_cfg; | |
270 | ||
271 | static void snd_soc_ac97_warm_reset(struct snd_ac97 *ac97) | |
272 | { | |
273 | struct pinctrl *pctl = snd_ac97_rst_cfg.pctl; | |
274 | ||
275 | pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_warm_reset); | |
276 | ||
277 | gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 1); | |
278 | ||
279 | udelay(10); | |
280 | ||
281 | gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0); | |
282 | ||
283 | pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run); | |
284 | msleep(2); | |
285 | } | |
286 | ||
287 | static void snd_soc_ac97_reset(struct snd_ac97 *ac97) | |
288 | { | |
289 | struct pinctrl *pctl = snd_ac97_rst_cfg.pctl; | |
290 | ||
291 | pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_reset); | |
292 | ||
293 | gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0); | |
294 | gpio_direction_output(snd_ac97_rst_cfg.gpio_sdata, 0); | |
295 | gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 0); | |
296 | ||
297 | udelay(10); | |
298 | ||
299 | gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 1); | |
300 | ||
301 | pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run); | |
302 | msleep(2); | |
303 | } | |
304 | ||
305 | static int snd_soc_ac97_parse_pinctl(struct device *dev, | |
306 | struct snd_ac97_reset_cfg *cfg) | |
307 | { | |
308 | struct pinctrl *p; | |
309 | struct pinctrl_state *state; | |
310 | int gpio; | |
311 | int ret; | |
312 | ||
313 | p = devm_pinctrl_get(dev); | |
314 | if (IS_ERR(p)) { | |
315 | dev_err(dev, "Failed to get pinctrl\n"); | |
316 | return PTR_ERR(p); | |
317 | } | |
318 | cfg->pctl = p; | |
319 | ||
320 | state = pinctrl_lookup_state(p, "ac97-reset"); | |
321 | if (IS_ERR(state)) { | |
322 | dev_err(dev, "Can't find pinctrl state ac97-reset\n"); | |
323 | return PTR_ERR(state); | |
324 | } | |
325 | cfg->pstate_reset = state; | |
326 | ||
327 | state = pinctrl_lookup_state(p, "ac97-warm-reset"); | |
328 | if (IS_ERR(state)) { | |
329 | dev_err(dev, "Can't find pinctrl state ac97-warm-reset\n"); | |
330 | return PTR_ERR(state); | |
331 | } | |
332 | cfg->pstate_warm_reset = state; | |
333 | ||
334 | state = pinctrl_lookup_state(p, "ac97-running"); | |
335 | if (IS_ERR(state)) { | |
336 | dev_err(dev, "Can't find pinctrl state ac97-running\n"); | |
337 | return PTR_ERR(state); | |
338 | } | |
339 | cfg->pstate_run = state; | |
340 | ||
341 | gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 0); | |
342 | if (gpio < 0) { | |
343 | dev_err(dev, "Can't find ac97-sync gpio\n"); | |
344 | return gpio; | |
345 | } | |
346 | ret = devm_gpio_request(dev, gpio, "AC97 link sync"); | |
347 | if (ret) { | |
348 | dev_err(dev, "Failed requesting ac97-sync gpio\n"); | |
349 | return ret; | |
350 | } | |
351 | cfg->gpio_sync = gpio; | |
352 | ||
353 | gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 1); | |
354 | if (gpio < 0) { | |
355 | dev_err(dev, "Can't find ac97-sdata gpio %d\n", gpio); | |
356 | return gpio; | |
357 | } | |
358 | ret = devm_gpio_request(dev, gpio, "AC97 link sdata"); | |
359 | if (ret) { | |
360 | dev_err(dev, "Failed requesting ac97-sdata gpio\n"); | |
361 | return ret; | |
362 | } | |
363 | cfg->gpio_sdata = gpio; | |
364 | ||
365 | gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 2); | |
366 | if (gpio < 0) { | |
367 | dev_err(dev, "Can't find ac97-reset gpio\n"); | |
368 | return gpio; | |
369 | } | |
370 | ret = devm_gpio_request(dev, gpio, "AC97 link reset"); | |
371 | if (ret) { | |
372 | dev_err(dev, "Failed requesting ac97-reset gpio\n"); | |
373 | return ret; | |
374 | } | |
375 | cfg->gpio_reset = gpio; | |
376 | ||
377 | return 0; | |
378 | } | |
379 | ||
380 | struct snd_ac97_bus_ops *soc_ac97_ops; | |
381 | EXPORT_SYMBOL_GPL(soc_ac97_ops); | |
382 | ||
383 | int snd_soc_set_ac97_ops(struct snd_ac97_bus_ops *ops) | |
384 | { | |
385 | if (ops == soc_ac97_ops) | |
386 | return 0; | |
387 | ||
388 | if (soc_ac97_ops && ops) | |
389 | return -EBUSY; | |
390 | ||
391 | soc_ac97_ops = ops; | |
eda1a701 | 392 | soc_ac97_bus.ops = ops; |
336b8423 LPC |
393 | |
394 | return 0; | |
395 | } | |
396 | EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops); | |
397 | ||
398 | /** | |
399 | * snd_soc_set_ac97_ops_of_reset - Set ac97 ops with generic ac97 reset functions | |
400 | * | |
401 | * This function sets the reset and warm_reset properties of ops and parses | |
402 | * the device node of pdev to get pinctrl states and gpio numbers to use. | |
403 | */ | |
404 | int snd_soc_set_ac97_ops_of_reset(struct snd_ac97_bus_ops *ops, | |
405 | struct platform_device *pdev) | |
406 | { | |
407 | struct device *dev = &pdev->dev; | |
408 | struct snd_ac97_reset_cfg cfg; | |
409 | int ret; | |
410 | ||
411 | ret = snd_soc_ac97_parse_pinctl(dev, &cfg); | |
412 | if (ret) | |
413 | return ret; | |
414 | ||
415 | ret = snd_soc_set_ac97_ops(ops); | |
416 | if (ret) | |
417 | return ret; | |
418 | ||
419 | ops->warm_reset = snd_soc_ac97_warm_reset; | |
420 | ops->reset = snd_soc_ac97_reset; | |
421 | ||
422 | snd_ac97_rst_cfg = cfg; | |
423 | return 0; | |
424 | } | |
425 | EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops_of_reset); |