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