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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> | |
23 | #include <linux/init.h> | |
24 | #include <linux/of_gpio.h> | |
25 | #include <linux/of.h> | |
26 | #include <linux/pinctrl/consumer.h> | |
27 | #include <linux/slab.h> | |
28 | #include <sound/ac97_codec.h> | |
29 | #include <sound/soc.h> | |
30 | ||
31 | struct snd_ac97_reset_cfg { | |
32 | struct pinctrl *pctl; | |
33 | struct pinctrl_state *pstate_reset; | |
34 | struct pinctrl_state *pstate_warm_reset; | |
35 | struct pinctrl_state *pstate_run; | |
36 | int gpio_sdata; | |
37 | int gpio_sync; | |
38 | int gpio_reset; | |
39 | }; | |
40 | ||
eda1a701 LPC |
41 | static struct snd_ac97_bus soc_ac97_bus = { |
42 | .ops = NULL, /* Gets initialized in snd_soc_set_ac97_ops() */ | |
43 | }; | |
44 | ||
336b8423 | 45 | /* register ac97 codec to bus */ |
336b8423 | 46 | static int soc_register_ac97_codec(struct snd_soc_codec *codec, |
bdfd60e3 | 47 | struct snd_soc_dai *codec_dai) |
336b8423 LPC |
48 | { |
49 | int ret; | |
50 | ||
51 | /* Only instantiate AC97 if not already done by the adaptor | |
52 | * for the generic AC97 subsystem. | |
53 | */ | |
bdfd60e3 LPC |
54 | if (!codec_dai->driver->ac97_control || codec->ac97_registered) |
55 | return 0; | |
336b8423 | 56 | |
bdfd60e3 LPC |
57 | /* |
58 | * It is possible that the AC97 device is already registered to | |
59 | * the device subsystem. This happens when the device is created | |
60 | * via snd_ac97_mixer(). Currently only SoC codec that does so | |
61 | * is the generic AC97 glue but others migh emerge. | |
62 | * | |
63 | * In those cases we don't try to register the device again. | |
64 | */ | |
65 | if (!codec->ac97_created) | |
66 | return 0; | |
67 | ||
68 | codec->ac97->dev.bus = &ac97_bus_type; | |
69 | codec->ac97->dev.parent = codec->component.card->dev; | |
336b8423 | 70 | |
bdfd60e3 LPC |
71 | dev_set_name(&codec->ac97->dev, "%d-%d:%s", |
72 | codec->component.card->snd_card->number, 0, | |
73 | codec->component.name); | |
74 | ret = device_add(&codec->ac97->dev); | |
75 | if (ret < 0) { | |
76 | dev_err(codec->dev, "ASoC: AC97 device register failed: %d\n", | |
77 | ret); | |
78 | return ret; | |
336b8423 | 79 | } |
bdfd60e3 LPC |
80 | codec->ac97_registered = 1; |
81 | ||
336b8423 LPC |
82 | return 0; |
83 | } | |
84 | ||
85 | static void soc_unregister_ac97_codec(struct snd_soc_codec *codec) | |
86 | { | |
bdfd60e3 LPC |
87 | if (!codec->ac97_registered) |
88 | return; | |
89 | device_del(&codec->ac97->dev); | |
90 | codec->ac97_registered = 0; | |
336b8423 LPC |
91 | } |
92 | ||
93 | static int soc_register_ac97_dai_link(struct snd_soc_pcm_runtime *rtd) | |
94 | { | |
95 | int i, ret; | |
96 | ||
97 | for (i = 0; i < rtd->num_codecs; i++) { | |
98 | struct snd_soc_dai *codec_dai = rtd->codec_dais[i]; | |
99 | ||
100 | ret = soc_register_ac97_codec(codec_dai->codec, codec_dai); | |
101 | if (ret) { | |
102 | while (--i >= 0) | |
103 | soc_unregister_ac97_codec(codec_dai->codec); | |
104 | return ret; | |
105 | } | |
106 | } | |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
111 | static void soc_unregister_ac97_dai_link(struct snd_soc_pcm_runtime *rtd) | |
112 | { | |
113 | int i; | |
114 | ||
115 | for (i = 0; i < rtd->num_codecs; i++) | |
116 | soc_unregister_ac97_codec(rtd->codec_dais[i]->codec); | |
117 | } | |
118 | ||
119 | static void soc_ac97_device_release(struct device *dev) | |
120 | { | |
121 | kfree(to_ac97_t(dev)); | |
122 | } | |
123 | ||
124 | /** | |
125 | * snd_soc_new_ac97_codec - initailise AC97 device | |
126 | * @codec: audio codec | |
336b8423 LPC |
127 | * |
128 | * Initialises AC97 codec resources for use by ad-hoc devices only. | |
129 | */ | |
eda1a701 | 130 | int snd_soc_new_ac97_codec(struct snd_soc_codec *codec) |
336b8423 LPC |
131 | { |
132 | codec->ac97 = kzalloc(sizeof(struct snd_ac97), GFP_KERNEL); | |
133 | if (codec->ac97 == NULL) | |
134 | return -ENOMEM; | |
135 | ||
eda1a701 LPC |
136 | codec->ac97->bus = &soc_ac97_bus; |
137 | codec->ac97->num = 0; | |
336b8423 LPC |
138 | codec->ac97->dev.release = soc_ac97_device_release; |
139 | ||
140 | /* | |
141 | * Mark the AC97 device to be created by us. This way we ensure that the | |
142 | * device will be registered with the device subsystem later on. | |
143 | */ | |
144 | codec->ac97_created = 1; | |
145 | device_initialize(&codec->ac97->dev); | |
146 | ||
147 | return 0; | |
148 | } | |
149 | EXPORT_SYMBOL_GPL(snd_soc_new_ac97_codec); | |
150 | ||
151 | /** | |
152 | * snd_soc_free_ac97_codec - free AC97 codec device | |
153 | * @codec: audio codec | |
154 | * | |
155 | * Frees AC97 codec device resources. | |
156 | */ | |
157 | void snd_soc_free_ac97_codec(struct snd_soc_codec *codec) | |
158 | { | |
159 | soc_unregister_ac97_codec(codec); | |
336b8423 LPC |
160 | codec->ac97->bus = NULL; |
161 | put_device(&codec->ac97->dev); | |
162 | codec->ac97 = NULL; | |
163 | codec->ac97_created = 0; | |
164 | } | |
165 | EXPORT_SYMBOL_GPL(snd_soc_free_ac97_codec); | |
166 | ||
167 | static struct snd_ac97_reset_cfg snd_ac97_rst_cfg; | |
168 | ||
169 | static void snd_soc_ac97_warm_reset(struct snd_ac97 *ac97) | |
170 | { | |
171 | struct pinctrl *pctl = snd_ac97_rst_cfg.pctl; | |
172 | ||
173 | pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_warm_reset); | |
174 | ||
175 | gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 1); | |
176 | ||
177 | udelay(10); | |
178 | ||
179 | gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0); | |
180 | ||
181 | pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run); | |
182 | msleep(2); | |
183 | } | |
184 | ||
185 | static void snd_soc_ac97_reset(struct snd_ac97 *ac97) | |
186 | { | |
187 | struct pinctrl *pctl = snd_ac97_rst_cfg.pctl; | |
188 | ||
189 | pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_reset); | |
190 | ||
191 | gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0); | |
192 | gpio_direction_output(snd_ac97_rst_cfg.gpio_sdata, 0); | |
193 | gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 0); | |
194 | ||
195 | udelay(10); | |
196 | ||
197 | gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 1); | |
198 | ||
199 | pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run); | |
200 | msleep(2); | |
201 | } | |
202 | ||
203 | static int snd_soc_ac97_parse_pinctl(struct device *dev, | |
204 | struct snd_ac97_reset_cfg *cfg) | |
205 | { | |
206 | struct pinctrl *p; | |
207 | struct pinctrl_state *state; | |
208 | int gpio; | |
209 | int ret; | |
210 | ||
211 | p = devm_pinctrl_get(dev); | |
212 | if (IS_ERR(p)) { | |
213 | dev_err(dev, "Failed to get pinctrl\n"); | |
214 | return PTR_ERR(p); | |
215 | } | |
216 | cfg->pctl = p; | |
217 | ||
218 | state = pinctrl_lookup_state(p, "ac97-reset"); | |
219 | if (IS_ERR(state)) { | |
220 | dev_err(dev, "Can't find pinctrl state ac97-reset\n"); | |
221 | return PTR_ERR(state); | |
222 | } | |
223 | cfg->pstate_reset = state; | |
224 | ||
225 | state = pinctrl_lookup_state(p, "ac97-warm-reset"); | |
226 | if (IS_ERR(state)) { | |
227 | dev_err(dev, "Can't find pinctrl state ac97-warm-reset\n"); | |
228 | return PTR_ERR(state); | |
229 | } | |
230 | cfg->pstate_warm_reset = state; | |
231 | ||
232 | state = pinctrl_lookup_state(p, "ac97-running"); | |
233 | if (IS_ERR(state)) { | |
234 | dev_err(dev, "Can't find pinctrl state ac97-running\n"); | |
235 | return PTR_ERR(state); | |
236 | } | |
237 | cfg->pstate_run = state; | |
238 | ||
239 | gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 0); | |
240 | if (gpio < 0) { | |
241 | dev_err(dev, "Can't find ac97-sync gpio\n"); | |
242 | return gpio; | |
243 | } | |
244 | ret = devm_gpio_request(dev, gpio, "AC97 link sync"); | |
245 | if (ret) { | |
246 | dev_err(dev, "Failed requesting ac97-sync gpio\n"); | |
247 | return ret; | |
248 | } | |
249 | cfg->gpio_sync = gpio; | |
250 | ||
251 | gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 1); | |
252 | if (gpio < 0) { | |
253 | dev_err(dev, "Can't find ac97-sdata gpio %d\n", gpio); | |
254 | return gpio; | |
255 | } | |
256 | ret = devm_gpio_request(dev, gpio, "AC97 link sdata"); | |
257 | if (ret) { | |
258 | dev_err(dev, "Failed requesting ac97-sdata gpio\n"); | |
259 | return ret; | |
260 | } | |
261 | cfg->gpio_sdata = gpio; | |
262 | ||
263 | gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 2); | |
264 | if (gpio < 0) { | |
265 | dev_err(dev, "Can't find ac97-reset gpio\n"); | |
266 | return gpio; | |
267 | } | |
268 | ret = devm_gpio_request(dev, gpio, "AC97 link reset"); | |
269 | if (ret) { | |
270 | dev_err(dev, "Failed requesting ac97-reset gpio\n"); | |
271 | return ret; | |
272 | } | |
273 | cfg->gpio_reset = gpio; | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
278 | struct snd_ac97_bus_ops *soc_ac97_ops; | |
279 | EXPORT_SYMBOL_GPL(soc_ac97_ops); | |
280 | ||
281 | int snd_soc_set_ac97_ops(struct snd_ac97_bus_ops *ops) | |
282 | { | |
283 | if (ops == soc_ac97_ops) | |
284 | return 0; | |
285 | ||
286 | if (soc_ac97_ops && ops) | |
287 | return -EBUSY; | |
288 | ||
289 | soc_ac97_ops = ops; | |
eda1a701 | 290 | soc_ac97_bus.ops = ops; |
336b8423 LPC |
291 | |
292 | return 0; | |
293 | } | |
294 | EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops); | |
295 | ||
296 | /** | |
297 | * snd_soc_set_ac97_ops_of_reset - Set ac97 ops with generic ac97 reset functions | |
298 | * | |
299 | * This function sets the reset and warm_reset properties of ops and parses | |
300 | * the device node of pdev to get pinctrl states and gpio numbers to use. | |
301 | */ | |
302 | int snd_soc_set_ac97_ops_of_reset(struct snd_ac97_bus_ops *ops, | |
303 | struct platform_device *pdev) | |
304 | { | |
305 | struct device *dev = &pdev->dev; | |
306 | struct snd_ac97_reset_cfg cfg; | |
307 | int ret; | |
308 | ||
309 | ret = snd_soc_ac97_parse_pinctl(dev, &cfg); | |
310 | if (ret) | |
311 | return ret; | |
312 | ||
313 | ret = snd_soc_set_ac97_ops(ops); | |
314 | if (ret) | |
315 | return ret; | |
316 | ||
317 | ops->warm_reset = snd_soc_ac97_warm_reset; | |
318 | ops->reset = snd_soc_ac97_reset; | |
319 | ||
320 | snd_ac97_rst_cfg = cfg; | |
321 | return 0; | |
322 | } | |
323 | EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops_of_reset); | |
324 | ||
325 | int snd_soc_ac97_register_dai_links(struct snd_soc_card *card) | |
326 | { | |
327 | int i; | |
328 | int ret; | |
329 | ||
330 | /* register any AC97 codecs */ | |
331 | for (i = 0; i < card->num_rtd; i++) { | |
332 | ret = soc_register_ac97_dai_link(&card->rtd[i]); | |
333 | if (ret < 0) | |
334 | goto err; | |
335 | } | |
336 | ||
337 | return 0; | |
338 | err: | |
339 | dev_err(card->dev, | |
340 | "ASoC: failed to register AC97: %d\n", ret); | |
341 | while (--i >= 0) | |
342 | soc_unregister_ac97_dai_link(&card->rtd[i]); | |
343 | return ret; | |
344 | } |