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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 = gpiochip_get_data(chip);
63
64 return gpio_priv->codec;
65}
66
67static 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
75static 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
85static 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
97static 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
109static 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
119static 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
130static 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
152static void snd_soc_ac97_free_gpio(struct snd_ac97 *ac97)
153{
154 gpiochip_remove(&ac97->gpio_priv->gpio_chip);
155}
156#else
157static int snd_soc_ac97_init_gpio(struct snd_ac97 *ac97,
158 struct snd_soc_codec *codec)
159{
160 return 0;
161}
162
163static 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 */
178struct 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}
201EXPORT_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 */
217struct 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
246err_put_device:
247 put_device(&ac97->dev);
248 return ERR_PTR(ret);
249}
250EXPORT_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 */
258void 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}
265EXPORT_SYMBOL_GPL(snd_soc_free_ac97_codec);
266
267static struct snd_ac97_reset_cfg snd_ac97_rst_cfg;
268
269static 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
285static 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
303static 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
378struct snd_ac97_bus_ops *soc_ac97_ops;
379EXPORT_SYMBOL_GPL(soc_ac97_ops);
380
381int 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}
394EXPORT_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 */
402int 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}
423EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops_of_reset);