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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_component *component;
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_component *gpio_to_component(struct gpio_chip *chip)
61{
62 struct snd_ac97_gpio_priv *gpio_priv = gpiochip_get_data(chip);
63
64 return gpio_priv->component;
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_component *component = gpio_to_component(chip);
79
80 dev_dbg(component->dev, "set gpio %d to output\n", offset);
81 return snd_soc_component_update_bits(component, 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_component *component = gpio_to_component(chip);
88 int ret;
89
90 if (snd_soc_component_read(component, AC97_GPIO_STATUS, &ret) < 0)
91 ret = -1;
92
93 dev_dbg(component->dev, "get gpio %d : %d\n", offset,
94 ret < 0 ? ret : ret & (1 << offset));
95
96 return ret < 0 ? ret : !!(ret & (1 << offset));
97}
98
99static void snd_soc_ac97_gpio_set(struct gpio_chip *chip, unsigned offset,
100 int value)
101{
102 struct snd_ac97_gpio_priv *gpio_priv = gpiochip_get_data(chip);
103 struct snd_soc_component *component = gpio_to_component(chip);
104
105 gpio_priv->gpios_set &= ~(1 << offset);
106 gpio_priv->gpios_set |= (!!value) << offset;
107 snd_soc_component_write(component, AC97_GPIO_STATUS,
108 gpio_priv->gpios_set);
109 dev_dbg(component->dev, "set gpio %d to %d\n", offset, !!value);
110}
111
112static int snd_soc_ac97_gpio_direction_out(struct gpio_chip *chip,
113 unsigned offset, int value)
114{
115 struct snd_soc_component *component = gpio_to_component(chip);
116
117 dev_dbg(component->dev, "set gpio %d to output\n", offset);
118 snd_soc_ac97_gpio_set(chip, offset, value);
119 return snd_soc_component_update_bits(component, AC97_GPIO_CFG,
120 1 << offset, 0);
121}
122
123static const struct gpio_chip snd_soc_ac97_gpio_chip = {
124 .label = "snd_soc_ac97",
125 .owner = THIS_MODULE,
126 .request = snd_soc_ac97_gpio_request,
127 .direction_input = snd_soc_ac97_gpio_direction_in,
128 .get = snd_soc_ac97_gpio_get,
129 .direction_output = snd_soc_ac97_gpio_direction_out,
130 .set = snd_soc_ac97_gpio_set,
131 .can_sleep = 1,
132};
133
134static int snd_soc_ac97_init_gpio(struct snd_ac97 *ac97,
135 struct snd_soc_component *component)
136{
137 struct snd_ac97_gpio_priv *gpio_priv;
138 int ret;
139
140 gpio_priv = devm_kzalloc(component->dev, sizeof(*gpio_priv), GFP_KERNEL);
141 if (!gpio_priv)
142 return -ENOMEM;
143 ac97->gpio_priv = gpio_priv;
144 gpio_priv->component = component;
145 gpio_priv->gpio_chip = snd_soc_ac97_gpio_chip;
146 gpio_priv->gpio_chip.ngpio = AC97_NUM_GPIOS;
147 gpio_priv->gpio_chip.parent = component->dev;
148 gpio_priv->gpio_chip.base = -1;
149
150 ret = gpiochip_add_data(&gpio_priv->gpio_chip, gpio_priv);
151 if (ret != 0)
152 dev_err(component->dev, "Failed to add GPIOs: %d\n", ret);
153 return ret;
154}
155
156static void snd_soc_ac97_free_gpio(struct snd_ac97 *ac97)
157{
158 gpiochip_remove(&ac97->gpio_priv->gpio_chip);
159}
160#else
161static int snd_soc_ac97_init_gpio(struct snd_ac97 *ac97,
162 struct snd_soc_component *component)
163{
164 return 0;
165}
166
167static void snd_soc_ac97_free_gpio(struct snd_ac97 *ac97)
168{
169}
170#endif
171
172/**
173 * snd_soc_alloc_ac97_component() - Allocate new a AC'97 device
174 * @component: The COMPONENT for which to create the AC'97 device
175 *
176 * Allocated a new snd_ac97 device and intializes it, but does not yet register
177 * it. The caller is responsible to either call device_add(&ac97->dev) to
178 * register the device, or to call put_device(&ac97->dev) to free the device.
179 *
180 * Returns: A snd_ac97 device or a PTR_ERR in case of an error.
181 */
182struct snd_ac97 *snd_soc_alloc_ac97_component(struct snd_soc_component *component)
183{
184 struct snd_ac97 *ac97;
185
186 ac97 = kzalloc(sizeof(struct snd_ac97), GFP_KERNEL);
187 if (ac97 == NULL)
188 return ERR_PTR(-ENOMEM);
189
190 ac97->bus = &soc_ac97_bus;
191 ac97->num = 0;
192
193 ac97->dev.bus = &ac97_bus_type;
194 ac97->dev.parent = component->card->dev;
195 ac97->dev.release = soc_ac97_device_release;
196
197 dev_set_name(&ac97->dev, "%d-%d:%s",
198 component->card->snd_card->number, 0,
199 component->name);
200
201 device_initialize(&ac97->dev);
202
203 return ac97;
204}
205EXPORT_SYMBOL(snd_soc_alloc_ac97_component);
206
207/**
208 * snd_soc_new_ac97_component - initailise AC97 device
209 * @component: audio component
210 * @id: The expected device ID
211 * @id_mask: Mask that is applied to the device ID before comparing with @id
212 *
213 * Initialises AC97 component resources for use by ad-hoc devices only.
214 *
215 * If @id is not 0 this function will reset the device, then read the ID from
216 * the device and check if it matches the expected ID. If it doesn't match an
217 * error will be returned and device will not be registered.
218 *
219 * Returns: A PTR_ERR() on failure or a valid snd_ac97 struct on success.
220 */
221struct snd_ac97 *snd_soc_new_ac97_component(struct snd_soc_component *component,
222 unsigned int id, unsigned int id_mask)
223{
224 struct snd_ac97 *ac97;
225 int ret;
226
227 ac97 = snd_soc_alloc_ac97_component(component);
228 if (IS_ERR(ac97))
229 return ac97;
230
231 if (id) {
232 ret = snd_ac97_reset(ac97, false, id, id_mask);
233 if (ret < 0) {
234 dev_err(component->dev, "Failed to reset AC97 device: %d\n",
235 ret);
236 goto err_put_device;
237 }
238 }
239
240 ret = device_add(&ac97->dev);
241 if (ret)
242 goto err_put_device;
243
244 ret = snd_soc_ac97_init_gpio(ac97, component);
245 if (ret)
246 goto err_put_device;
247
248 return ac97;
249
250err_put_device:
251 put_device(&ac97->dev);
252 return ERR_PTR(ret);
253}
254EXPORT_SYMBOL_GPL(snd_soc_new_ac97_component);
255
256/**
257 * snd_soc_free_ac97_component - free AC97 component device
258 * @ac97: snd_ac97 device to be freed
259 *
260 * Frees AC97 component device resources.
261 */
262void snd_soc_free_ac97_component(struct snd_ac97 *ac97)
263{
264 snd_soc_ac97_free_gpio(ac97);
265 device_del(&ac97->dev);
266 ac97->bus = NULL;
267 put_device(&ac97->dev);
268}
269EXPORT_SYMBOL_GPL(snd_soc_free_ac97_component);
270
271static struct snd_ac97_reset_cfg snd_ac97_rst_cfg;
272
273static void snd_soc_ac97_warm_reset(struct snd_ac97 *ac97)
274{
275 struct pinctrl *pctl = snd_ac97_rst_cfg.pctl;
276
277 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_warm_reset);
278
279 gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 1);
280
281 udelay(10);
282
283 gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0);
284
285 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run);
286 msleep(2);
287}
288
289static void snd_soc_ac97_reset(struct snd_ac97 *ac97)
290{
291 struct pinctrl *pctl = snd_ac97_rst_cfg.pctl;
292
293 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_reset);
294
295 gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0);
296 gpio_direction_output(snd_ac97_rst_cfg.gpio_sdata, 0);
297 gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 0);
298
299 udelay(10);
300
301 gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 1);
302
303 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run);
304 msleep(2);
305}
306
307static int snd_soc_ac97_parse_pinctl(struct device *dev,
308 struct snd_ac97_reset_cfg *cfg)
309{
310 struct pinctrl *p;
311 struct pinctrl_state *state;
312 int gpio;
313 int ret;
314
315 p = devm_pinctrl_get(dev);
316 if (IS_ERR(p)) {
317 dev_err(dev, "Failed to get pinctrl\n");
318 return PTR_ERR(p);
319 }
320 cfg->pctl = p;
321
322 state = pinctrl_lookup_state(p, "ac97-reset");
323 if (IS_ERR(state)) {
324 dev_err(dev, "Can't find pinctrl state ac97-reset\n");
325 return PTR_ERR(state);
326 }
327 cfg->pstate_reset = state;
328
329 state = pinctrl_lookup_state(p, "ac97-warm-reset");
330 if (IS_ERR(state)) {
331 dev_err(dev, "Can't find pinctrl state ac97-warm-reset\n");
332 return PTR_ERR(state);
333 }
334 cfg->pstate_warm_reset = state;
335
336 state = pinctrl_lookup_state(p, "ac97-running");
337 if (IS_ERR(state)) {
338 dev_err(dev, "Can't find pinctrl state ac97-running\n");
339 return PTR_ERR(state);
340 }
341 cfg->pstate_run = state;
342
343 gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 0);
344 if (gpio < 0) {
345 dev_err(dev, "Can't find ac97-sync gpio\n");
346 return gpio;
347 }
348 ret = devm_gpio_request(dev, gpio, "AC97 link sync");
349 if (ret) {
350 dev_err(dev, "Failed requesting ac97-sync gpio\n");
351 return ret;
352 }
353 cfg->gpio_sync = gpio;
354
355 gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 1);
356 if (gpio < 0) {
357 dev_err(dev, "Can't find ac97-sdata gpio %d\n", gpio);
358 return gpio;
359 }
360 ret = devm_gpio_request(dev, gpio, "AC97 link sdata");
361 if (ret) {
362 dev_err(dev, "Failed requesting ac97-sdata gpio\n");
363 return ret;
364 }
365 cfg->gpio_sdata = gpio;
366
367 gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 2);
368 if (gpio < 0) {
369 dev_err(dev, "Can't find ac97-reset gpio\n");
370 return gpio;
371 }
372 ret = devm_gpio_request(dev, gpio, "AC97 link reset");
373 if (ret) {
374 dev_err(dev, "Failed requesting ac97-reset gpio\n");
375 return ret;
376 }
377 cfg->gpio_reset = gpio;
378
379 return 0;
380}
381
382struct snd_ac97_bus_ops *soc_ac97_ops;
383EXPORT_SYMBOL_GPL(soc_ac97_ops);
384
385int snd_soc_set_ac97_ops(struct snd_ac97_bus_ops *ops)
386{
387 if (ops == soc_ac97_ops)
388 return 0;
389
390 if (soc_ac97_ops && ops)
391 return -EBUSY;
392
393 soc_ac97_ops = ops;
394 soc_ac97_bus.ops = ops;
395
396 return 0;
397}
398EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops);
399
400/**
401 * snd_soc_set_ac97_ops_of_reset - Set ac97 ops with generic ac97 reset functions
402 *
403 * This function sets the reset and warm_reset properties of ops and parses
404 * the device node of pdev to get pinctrl states and gpio numbers to use.
405 */
406int snd_soc_set_ac97_ops_of_reset(struct snd_ac97_bus_ops *ops,
407 struct platform_device *pdev)
408{
409 struct device *dev = &pdev->dev;
410 struct snd_ac97_reset_cfg cfg;
411 int ret;
412
413 ret = snd_soc_ac97_parse_pinctl(dev, &cfg);
414 if (ret)
415 return ret;
416
417 ret = snd_soc_set_ac97_ops(ops);
418 if (ret)
419 return ret;
420
421 ops->warm_reset = snd_soc_ac97_warm_reset;
422 ops->reset = snd_soc_ac97_reset;
423
424 snd_ac97_rst_cfg = cfg;
425 return 0;
426}
427EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops_of_reset);