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