1 // SPDX-License-Identifier: GPL-2.0+
3 // soc-ac97.c -- ALSA SoC Audio Layer AC97 support
5 // Copyright 2005 Wolfson Microelectronics PLC.
6 // Copyright 2005 Openedhand Ltd.
7 // Copyright (C) 2010 Slimlogic Ltd.
8 // Copyright (C) 2010 Texas Instruments Inc.
10 // Author: Liam Girdwood <lrg@slimlogic.co.uk>
11 // with code, comments and ideas from :-
12 // Richard Purdie <richard@openedhand.com>
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>
21 #include <linux/pinctrl/consumer.h>
22 #include <linux/slab.h>
23 #include <sound/ac97_codec.h>
24 #include <sound/soc.h>
26 struct snd_ac97_reset_cfg {
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;
36 static struct snd_ac97_bus soc_ac97_bus = {
37 .ops = NULL, /* Gets initialized in snd_soc_set_ac97_ops() */
40 static void soc_ac97_device_release(struct device *dev)
42 kfree(to_ac97_t(dev));
46 struct snd_ac97_gpio_priv {
47 struct gpio_chip gpio_chip;
48 unsigned int gpios_set;
49 struct snd_soc_component *component;
52 static inline struct snd_soc_component *gpio_to_component(struct gpio_chip *chip)
54 struct snd_ac97_gpio_priv *gpio_priv = gpiochip_get_data(chip);
56 return gpio_priv->component;
59 static int snd_soc_ac97_gpio_request(struct gpio_chip *chip, unsigned int offset)
61 if (offset >= AC97_NUM_GPIOS)
67 static int snd_soc_ac97_gpio_direction_in(struct gpio_chip *chip,
70 struct snd_soc_component *component = gpio_to_component(chip);
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);
77 static int snd_soc_ac97_gpio_get(struct gpio_chip *chip, unsigned int offset)
79 struct snd_soc_component *component = gpio_to_component(chip);
82 ret = snd_soc_component_read(component, AC97_GPIO_STATUS);
84 dev_dbg(component->dev, "get gpio %d : %d\n", offset,
87 return !!(ret & (1 << offset));
90 static void snd_soc_ac97_gpio_set(struct gpio_chip *chip, unsigned int offset,
93 struct snd_ac97_gpio_priv *gpio_priv = gpiochip_get_data(chip);
94 struct snd_soc_component *component = gpio_to_component(chip);
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);
103 static int snd_soc_ac97_gpio_direction_out(struct gpio_chip *chip,
104 unsigned offset, int value)
106 struct snd_soc_component *component = gpio_to_component(chip);
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,
114 static 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,
125 static int snd_soc_ac97_init_gpio(struct snd_ac97 *ac97,
126 struct snd_soc_component *component)
128 struct snd_ac97_gpio_priv *gpio_priv;
131 gpio_priv = devm_kzalloc(component->dev, sizeof(*gpio_priv), GFP_KERNEL);
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;
141 ret = gpiochip_add_data(&gpio_priv->gpio_chip, gpio_priv);
143 dev_err(component->dev, "Failed to add GPIOs: %d\n", ret);
147 static void snd_soc_ac97_free_gpio(struct snd_ac97 *ac97)
149 gpiochip_remove(&ac97->gpio_priv->gpio_chip);
152 static int snd_soc_ac97_init_gpio(struct snd_ac97 *ac97,
153 struct snd_soc_component *component)
158 static void snd_soc_ac97_free_gpio(struct snd_ac97 *ac97)
164 * snd_soc_alloc_ac97_component() - Allocate new a AC'97 device
165 * @component: The COMPONENT for which to create the AC'97 device
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.
171 * Returns: A snd_ac97 device or a PTR_ERR in case of an error.
173 struct snd_ac97 *snd_soc_alloc_ac97_component(struct snd_soc_component *component)
175 struct snd_ac97 *ac97;
177 ac97 = kzalloc(sizeof(struct snd_ac97), GFP_KERNEL);
179 return ERR_PTR(-ENOMEM);
181 ac97->bus = &soc_ac97_bus;
184 ac97->dev.bus = &ac97_bus_type;
185 ac97->dev.parent = component->card->dev;
186 ac97->dev.release = soc_ac97_device_release;
188 dev_set_name(&ac97->dev, "%d-%d:%s",
189 component->card->snd_card->number, 0,
192 device_initialize(&ac97->dev);
196 EXPORT_SYMBOL(snd_soc_alloc_ac97_component);
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
204 * Initialises AC97 component resources for use by ad-hoc devices only.
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.
210 * Returns: A PTR_ERR() on failure or a valid snd_ac97 struct on success.
212 struct snd_ac97 *snd_soc_new_ac97_component(struct snd_soc_component *component,
213 unsigned int id, unsigned int id_mask)
215 struct snd_ac97 *ac97;
218 ac97 = snd_soc_alloc_ac97_component(component);
223 ret = snd_ac97_reset(ac97, false, id, id_mask);
225 dev_err(component->dev, "Failed to reset AC97 device: %d\n",
231 ret = device_add(&ac97->dev);
235 ret = snd_soc_ac97_init_gpio(ac97, component);
242 put_device(&ac97->dev);
245 EXPORT_SYMBOL_GPL(snd_soc_new_ac97_component);
248 * snd_soc_free_ac97_component - free AC97 component device
249 * @ac97: snd_ac97 device to be freed
251 * Frees AC97 component device resources.
253 void snd_soc_free_ac97_component(struct snd_ac97 *ac97)
255 snd_soc_ac97_free_gpio(ac97);
256 device_del(&ac97->dev);
258 put_device(&ac97->dev);
260 EXPORT_SYMBOL_GPL(snd_soc_free_ac97_component);
262 static struct snd_ac97_reset_cfg snd_ac97_rst_cfg;
264 static void snd_soc_ac97_warm_reset(struct snd_ac97 *ac97)
266 struct pinctrl *pctl = snd_ac97_rst_cfg.pctl;
268 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_warm_reset);
270 gpiod_direction_output_raw(snd_ac97_rst_cfg.sync_gpio, 1);
274 gpiod_direction_output_raw(snd_ac97_rst_cfg.sync_gpio, 0);
276 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run);
280 static void snd_soc_ac97_reset(struct snd_ac97 *ac97)
282 struct pinctrl *pctl = snd_ac97_rst_cfg.pctl;
284 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_reset);
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);
292 gpiod_direction_output_raw(snd_ac97_rst_cfg.reset_gpio, 1);
294 pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run);
298 static int snd_soc_ac97_parse_pinctl(struct device *dev,
299 struct snd_ac97_reset_cfg *cfg)
302 struct pinctrl_state *state;
304 p = devm_pinctrl_get(dev);
306 dev_err(dev, "Failed to get pinctrl\n");
311 state = pinctrl_lookup_state(p, "ac97-reset");
313 dev_err(dev, "Can't find pinctrl state ac97-reset\n");
314 return PTR_ERR(state);
316 cfg->pstate_reset = state;
318 state = pinctrl_lookup_state(p, "ac97-warm-reset");
320 dev_err(dev, "Can't find pinctrl state ac97-warm-reset\n");
321 return PTR_ERR(state);
323 cfg->pstate_warm_reset = state;
325 state = pinctrl_lookup_state(p, "ac97-running");
327 dev_err(dev, "Can't find pinctrl state ac97-running\n");
328 return PTR_ERR(state);
330 cfg->pstate_run = state;
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");
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");
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");
350 struct snd_ac97_bus_ops *soc_ac97_ops;
351 EXPORT_SYMBOL_GPL(soc_ac97_ops);
353 int snd_soc_set_ac97_ops(struct snd_ac97_bus_ops *ops)
355 if (ops == soc_ac97_ops)
358 if (soc_ac97_ops && ops)
362 soc_ac97_bus.ops = ops;
366 EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops);
369 * snd_soc_set_ac97_ops_of_reset - Set ac97 ops with generic ac97 reset functions
371 * @pdev: platform device
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.
376 int snd_soc_set_ac97_ops_of_reset(struct snd_ac97_bus_ops *ops,
377 struct platform_device *pdev)
379 struct device *dev = &pdev->dev;
380 struct snd_ac97_reset_cfg cfg;
383 ret = snd_soc_ac97_parse_pinctl(dev, &cfg);
387 ret = snd_soc_set_ac97_ops(ops);
391 ops->warm_reset = snd_soc_ac97_warm_reset;
392 ops->reset = snd_soc_ac97_reset;
394 snd_ac97_rst_cfg = cfg;
397 EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops_of_reset);