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1// SPDX-License-Identifier: GPL-2.0+
2//
3// soc-ac97.c -- ALSA SoC Audio Layer AC97 support
4//
5// Copyright 2005 Wolfson Microelectronics PLC.
6// Copyright 2005 Openedhand Ltd.
7// Copyright (C) 2010 Slimlogic Ltd.
8// Copyright (C) 2010 Texas Instruments Inc.
9//
10// Author: Liam Girdwood <lrg@slimlogic.co.uk>
11// with code, comments and ideas from :-
12// Richard Purdie <richard@openedhand.com>
13
14#include <linux/ctype.h>
15#include <linux/delay.h>
16#include <linux/export.h>
17#include <linux/gpio.h>
18#include <linux/gpio/driver.h>
19#include <linux/init.h>
20#include <linux/of_gpio.h>
21#include <linux/of.h>
22#include <linux/pinctrl/consumer.h>
23#include <linux/slab.h>
24#include <sound/ac97_codec.h>
25#include <sound/soc.h>
26
27struct snd_ac97_reset_cfg {
28 struct pinctrl *pctl;
29 struct pinctrl_state *pstate_reset;
30 struct pinctrl_state *pstate_warm_reset;
31 struct pinctrl_state *pstate_run;
32 int gpio_sdata;
33 int gpio_sync;
34 int gpio_reset;
35};
36
37static struct snd_ac97_bus soc_ac97_bus = {
38 .ops = NULL, /* Gets initialized in snd_soc_set_ac97_ops() */
39};
40
41static void soc_ac97_device_release(struct device *dev)
42{
43 kfree(to_ac97_t(dev));
44}
45
46#ifdef CONFIG_GPIOLIB
47struct snd_ac97_gpio_priv {
48 struct gpio_chip gpio_chip;
49 unsigned int gpios_set;
50 struct snd_soc_component *component;
51};
52
53static inline struct snd_soc_component *gpio_to_component(struct gpio_chip *chip)
54{
55 struct snd_ac97_gpio_priv *gpio_priv = gpiochip_get_data(chip);
56
57 return gpio_priv->component;
58}
59
60static int snd_soc_ac97_gpio_request(struct gpio_chip *chip, unsigned int offset)
61{
62 if (offset >= AC97_NUM_GPIOS)
63 return -EINVAL;
64
65 return 0;
66}
67
68static int snd_soc_ac97_gpio_direction_in(struct gpio_chip *chip,
69 unsigned int offset)
70{
71 struct snd_soc_component *component = gpio_to_component(chip);
72
73 dev_dbg(component->dev, "set gpio %d to output\n", offset);
74 return snd_soc_component_update_bits(component, AC97_GPIO_CFG,
75 1 << offset, 1 << offset);
76}
77
78static int snd_soc_ac97_gpio_get(struct gpio_chip *chip, unsigned int offset)
79{
80 struct snd_soc_component *component = gpio_to_component(chip);
81 int ret;
82
83 ret = snd_soc_component_read(component, AC97_GPIO_STATUS);
84
85 dev_dbg(component->dev, "get gpio %d : %d\n", offset,
86 ret & (1 << offset));
87
88 return !!(ret & (1 << offset));
89}
90
91static void snd_soc_ac97_gpio_set(struct gpio_chip *chip, unsigned int offset,
92 int value)
93{
94 struct snd_ac97_gpio_priv *gpio_priv = gpiochip_get_data(chip);
95 struct snd_soc_component *component = gpio_to_component(chip);
96
97 gpio_priv->gpios_set &= ~(1 << offset);
98 gpio_priv->gpios_set |= (!!value) << offset;
99 snd_soc_component_write(component, AC97_GPIO_STATUS,
100 gpio_priv->gpios_set);
101 dev_dbg(component->dev, "set gpio %d to %d\n", offset, !!value);
102}
103
104static int snd_soc_ac97_gpio_direction_out(struct gpio_chip *chip,
105 unsigned offset, int value)
106{
107 struct snd_soc_component *component = gpio_to_component(chip);
108
109 dev_dbg(component->dev, "set gpio %d to output\n", offset);
110 snd_soc_ac97_gpio_set(chip, offset, value);
111 return snd_soc_component_update_bits(component, AC97_GPIO_CFG,
112 1 << offset, 0);
113}
114
115static const struct gpio_chip snd_soc_ac97_gpio_chip = {
116 .label = "snd_soc_ac97",
117 .owner = THIS_MODULE,
118 .request = snd_soc_ac97_gpio_request,
119 .direction_input = snd_soc_ac97_gpio_direction_in,
120 .get = snd_soc_ac97_gpio_get,
121 .direction_output = snd_soc_ac97_gpio_direction_out,
122 .set = snd_soc_ac97_gpio_set,
123 .can_sleep = 1,
124};
125
126static int snd_soc_ac97_init_gpio(struct snd_ac97 *ac97,
127 struct snd_soc_component *component)
128{
129 struct snd_ac97_gpio_priv *gpio_priv;
130 int ret;
131
132 gpio_priv = devm_kzalloc(component->dev, sizeof(*gpio_priv), GFP_KERNEL);
133 if (!gpio_priv)
134 return -ENOMEM;
135 ac97->gpio_priv = gpio_priv;
136 gpio_priv->component = component;
137 gpio_priv->gpio_chip = snd_soc_ac97_gpio_chip;
138 gpio_priv->gpio_chip.ngpio = AC97_NUM_GPIOS;
139 gpio_priv->gpio_chip.parent = component->dev;
140 gpio_priv->gpio_chip.base = -1;
141
142 ret = gpiochip_add_data(&gpio_priv->gpio_chip, gpio_priv);
143 if (ret != 0)
144 dev_err(component->dev, "Failed to add GPIOs: %d\n", ret);
145 return ret;
146}
147
148static void snd_soc_ac97_free_gpio(struct snd_ac97 *ac97)
149{
150 gpiochip_remove(&ac97->gpio_priv->gpio_chip);
151}
152#else
153static int snd_soc_ac97_init_gpio(struct snd_ac97 *ac97,
154 struct snd_soc_component *component)
155{
156 return 0;
157}
158
159static void snd_soc_ac97_free_gpio(struct snd_ac97 *ac97)
160{
161}
162#endif
163
164/**
165 * snd_soc_alloc_ac97_component() - Allocate new a AC'97 device
166 * @component: The COMPONENT for which to create the AC'97 device
167 *
168 * Allocated a new snd_ac97 device and intializes it, but does not yet register
169 * it. The caller is responsible to either call device_add(&ac97->dev) to
170 * register the device, or to call put_device(&ac97->dev) to free the device.
171 *
172 * Returns: A snd_ac97 device or a PTR_ERR in case of an error.
173 */
174struct snd_ac97 *snd_soc_alloc_ac97_component(struct snd_soc_component *component)
175{
176 struct snd_ac97 *ac97;
177
178 ac97 = kzalloc(sizeof(struct snd_ac97), GFP_KERNEL);
179 if (ac97 == NULL)
180 return ERR_PTR(-ENOMEM);
181
182 ac97->bus = &soc_ac97_bus;
183 ac97->num = 0;
184
185 ac97->dev.bus = &ac97_bus_type;
186 ac97->dev.parent = component->card->dev;
187 ac97->dev.release = soc_ac97_device_release;
188
189 dev_set_name(&ac97->dev, "%d-%d:%s",
190 component->card->snd_card->number, 0,
191 component->name);
192
193 device_initialize(&ac97->dev);
194
195 return ac97;
196}
197EXPORT_SYMBOL(snd_soc_alloc_ac97_component);
198
199/**
200 * snd_soc_new_ac97_component - initailise AC97 device
201 * @component: audio component
202 * @id: The expected device ID
203 * @id_mask: Mask that is applied to the device ID before comparing with @id
204 *
205 * Initialises AC97 component resources for use by ad-hoc devices only.
206 *
207 * If @id is not 0 this function will reset the device, then read the ID from
208 * the device and check if it matches the expected ID. If it doesn't match an
209 * error will be returned and device will not be registered.
210 *
211 * Returns: A PTR_ERR() on failure or a valid snd_ac97 struct on success.
212 */
213struct snd_ac97 *snd_soc_new_ac97_component(struct snd_soc_component *component,
214 unsigned int id, unsigned int id_mask)
215{
216 struct snd_ac97 *ac97;
217 int ret;
218
219 ac97 = snd_soc_alloc_ac97_component(component);
220 if (IS_ERR(ac97))
221 return ac97;
222
223 if (id) {
224 ret = snd_ac97_reset(ac97, false, id, id_mask);
225 if (ret < 0) {
226 dev_err(component->dev, "Failed to reset AC97 device: %d\n",
227 ret);
228 goto err_put_device;
229 }
230 }
231
232 ret = device_add(&ac97->dev);
233 if (ret)
234 goto err_put_device;
235
236 ret = snd_soc_ac97_init_gpio(ac97, component);
237 if (ret)
238 goto err_put_device;
239
240 return ac97;
241
242err_put_device:
243 put_device(&ac97->dev);
244 return ERR_PTR(ret);
245}
246EXPORT_SYMBOL_GPL(snd_soc_new_ac97_component);
247
248/**
249 * snd_soc_free_ac97_component - free AC97 component device
250 * @ac97: snd_ac97 device to be freed
251 *
252 * Frees AC97 component device resources.
253 */
254void snd_soc_free_ac97_component(struct snd_ac97 *ac97)
255{
256 snd_soc_ac97_free_gpio(ac97);
257 device_del(&ac97->dev);
258 ac97->bus = NULL;
259 put_device(&ac97->dev);
260}
261EXPORT_SYMBOL_GPL(snd_soc_free_ac97_component);
262
263static struct snd_ac97_reset_cfg snd_ac97_rst_cfg;
264
265static void snd_soc_ac97_warm_reset(struct snd_ac97 *ac97)
266{
267 struct pinctrl *pctl = snd_ac97_rst_cfg.pctl;
268
269 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_warm_reset);
270
271 gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 1);
272
273 udelay(10);
274
275 gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0);
276
277 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run);
278 msleep(2);
279}
280
281static void snd_soc_ac97_reset(struct snd_ac97 *ac97)
282{
283 struct pinctrl *pctl = snd_ac97_rst_cfg.pctl;
284
285 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_reset);
286
287 gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0);
288 gpio_direction_output(snd_ac97_rst_cfg.gpio_sdata, 0);
289 gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 0);
290
291 udelay(10);
292
293 gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 1);
294
295 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run);
296 msleep(2);
297}
298
299static int snd_soc_ac97_parse_pinctl(struct device *dev,
300 struct snd_ac97_reset_cfg *cfg)
301{
302 struct pinctrl *p;
303 struct pinctrl_state *state;
304 int gpio;
305 int ret;
306
307 p = devm_pinctrl_get(dev);
308 if (IS_ERR(p)) {
309 dev_err(dev, "Failed to get pinctrl\n");
310 return PTR_ERR(p);
311 }
312 cfg->pctl = p;
313
314 state = pinctrl_lookup_state(p, "ac97-reset");
315 if (IS_ERR(state)) {
316 dev_err(dev, "Can't find pinctrl state ac97-reset\n");
317 return PTR_ERR(state);
318 }
319 cfg->pstate_reset = state;
320
321 state = pinctrl_lookup_state(p, "ac97-warm-reset");
322 if (IS_ERR(state)) {
323 dev_err(dev, "Can't find pinctrl state ac97-warm-reset\n");
324 return PTR_ERR(state);
325 }
326 cfg->pstate_warm_reset = state;
327
328 state = pinctrl_lookup_state(p, "ac97-running");
329 if (IS_ERR(state)) {
330 dev_err(dev, "Can't find pinctrl state ac97-running\n");
331 return PTR_ERR(state);
332 }
333 cfg->pstate_run = state;
334
335 gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 0);
336 if (gpio < 0) {
337 dev_err(dev, "Can't find ac97-sync gpio\n");
338 return gpio;
339 }
340 ret = devm_gpio_request(dev, gpio, "AC97 link sync");
341 if (ret) {
342 dev_err(dev, "Failed requesting ac97-sync gpio\n");
343 return ret;
344 }
345 cfg->gpio_sync = gpio;
346
347 gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 1);
348 if (gpio < 0) {
349 dev_err(dev, "Can't find ac97-sdata gpio %d\n", gpio);
350 return gpio;
351 }
352 ret = devm_gpio_request(dev, gpio, "AC97 link sdata");
353 if (ret) {
354 dev_err(dev, "Failed requesting ac97-sdata gpio\n");
355 return ret;
356 }
357 cfg->gpio_sdata = gpio;
358
359 gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 2);
360 if (gpio < 0) {
361 dev_err(dev, "Can't find ac97-reset gpio\n");
362 return gpio;
363 }
364 ret = devm_gpio_request(dev, gpio, "AC97 link reset");
365 if (ret) {
366 dev_err(dev, "Failed requesting ac97-reset gpio\n");
367 return ret;
368 }
369 cfg->gpio_reset = gpio;
370
371 return 0;
372}
373
374struct snd_ac97_bus_ops *soc_ac97_ops;
375EXPORT_SYMBOL_GPL(soc_ac97_ops);
376
377int snd_soc_set_ac97_ops(struct snd_ac97_bus_ops *ops)
378{
379 if (ops == soc_ac97_ops)
380 return 0;
381
382 if (soc_ac97_ops && ops)
383 return -EBUSY;
384
385 soc_ac97_ops = ops;
386 soc_ac97_bus.ops = ops;
387
388 return 0;
389}
390EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops);
391
392/**
393 * snd_soc_set_ac97_ops_of_reset - Set ac97 ops with generic ac97 reset functions
394 * @ops: bus ops
395 * @pdev: platform device
396 *
397 * This function sets the reset and warm_reset properties of ops and parses
398 * the device node of pdev to get pinctrl states and gpio numbers to use.
399 */
400int snd_soc_set_ac97_ops_of_reset(struct snd_ac97_bus_ops *ops,
401 struct platform_device *pdev)
402{
403 struct device *dev = &pdev->dev;
404 struct snd_ac97_reset_cfg cfg;
405 int ret;
406
407 ret = snd_soc_ac97_parse_pinctl(dev, &cfg);
408 if (ret)
409 return ret;
410
411 ret = snd_soc_set_ac97_ops(ops);
412 if (ret)
413 return ret;
414
415 ops->warm_reset = snd_soc_ac97_warm_reset;
416 ops->reset = snd_soc_ac97_reset;
417
418 snd_ac97_rst_cfg = cfg;
419 return 0;
420}
421EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops_of_reset);
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
32struct 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
42struct 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
50static struct snd_ac97_bus soc_ac97_bus = {
51 .ops = NULL, /* Gets initialized in snd_soc_set_ac97_ops() */
52};
53
54static void soc_ac97_device_release(struct device *dev)
55{
56 kfree(to_ac97_t(dev));
57}
58
59#ifdef CONFIG_GPIOLIB
60static 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
68static 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
76static 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
86static 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
95 return ret < 0 ? ret : !!(ret & (1 << offset));
96}
97
98static 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
111static 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
121static 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
132static 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;
145 gpio_priv->gpio_chip.parent = codec->dev;
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
154static void snd_soc_ac97_free_gpio(struct snd_ac97 *ac97)
155{
156 gpiochip_remove(&ac97->gpio_priv->gpio_chip);
157}
158#else
159static int snd_soc_ac97_init_gpio(struct snd_ac97 *ac97,
160 struct snd_soc_codec *codec)
161{
162 return 0;
163}
164
165static void snd_soc_ac97_free_gpio(struct snd_ac97 *ac97)
166{
167}
168#endif
169
170/**
171 * snd_soc_alloc_ac97_codec() - Allocate new a AC'97 device
172 * @codec: The CODEC for which to create the AC'97 device
173 *
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.
179 */
180struct snd_ac97 *snd_soc_alloc_ac97_codec(struct snd_soc_codec *codec)
181{
182 struct snd_ac97 *ac97;
183
184 ac97 = kzalloc(sizeof(struct snd_ac97), GFP_KERNEL);
185 if (ac97 == NULL)
186 return ERR_PTR(-ENOMEM);
187
188 ac97->bus = &soc_ac97_bus;
189 ac97->num = 0;
190
191 ac97->dev.bus = &ac97_bus_type;
192 ac97->dev.parent = codec->component.card->dev;
193 ac97->dev.release = soc_ac97_device_release;
194
195 dev_set_name(&ac97->dev, "%d-%d:%s",
196 codec->component.card->snd_card->number, 0,
197 codec->component.name);
198
199 device_initialize(&ac97->dev);
200
201 return ac97;
202}
203EXPORT_SYMBOL(snd_soc_alloc_ac97_codec);
204
205/**
206 * snd_soc_new_ac97_codec - initailise AC97 device
207 * @codec: audio codec
208 * @id: The expected device ID
209 * @id_mask: Mask that is applied to the device ID before comparing with @id
210 *
211 * Initialises AC97 codec resources for use by ad-hoc devices only.
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.
218 */
219struct snd_ac97 *snd_soc_new_ac97_codec(struct snd_soc_codec *codec,
220 unsigned int id, unsigned int id_mask)
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
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 }
236 }
237
238 ret = device_add(&ac97->dev);
239 if (ret)
240 goto err_put_device;
241
242 ret = snd_soc_ac97_init_gpio(ac97, codec);
243 if (ret)
244 goto err_put_device;
245
246 return ac97;
247
248err_put_device:
249 put_device(&ac97->dev);
250 return ERR_PTR(ret);
251}
252EXPORT_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 */
260void snd_soc_free_ac97_codec(struct snd_ac97 *ac97)
261{
262 snd_soc_ac97_free_gpio(ac97);
263 device_del(&ac97->dev);
264 ac97->bus = NULL;
265 put_device(&ac97->dev);
266}
267EXPORT_SYMBOL_GPL(snd_soc_free_ac97_codec);
268
269static struct snd_ac97_reset_cfg snd_ac97_rst_cfg;
270
271static 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
287static 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
305static 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
380struct snd_ac97_bus_ops *soc_ac97_ops;
381EXPORT_SYMBOL_GPL(soc_ac97_ops);
382
383int 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;
392 soc_ac97_bus.ops = ops;
393
394 return 0;
395}
396EXPORT_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 */
404int 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}
425EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops_of_reset);