1 // SPDX-License-Identifier: GPL-2.0+
3 // soc-ac97.c  --  ALSA SoC Audio Layer AC97 support
11 //         with code, comments and ideas from :-
17 #include <linux/gpio.h>
18 #include <linux/gpio/driver.h>
59 	return gpio_priv->component;  in gpio_to_component()
65 		return -EINVAL;  in snd_soc_ac97_gpio_request()
75 	dev_dbg(component->dev, "set gpio %d to output\n", offset);  in snd_soc_ac97_gpio_direction_in()
86 		ret = -1;  in snd_soc_ac97_gpio_get()
88 	dev_dbg(component->dev, "get gpio %d : %d\n", offset,  in snd_soc_ac97_gpio_get()
100 	gpio_priv->gpios_set &= ~(1 << offset);  in snd_soc_ac97_gpio_set()
101 	gpio_priv->gpios_set |= (!!value) << offset;  in snd_soc_ac97_gpio_set()
103 				gpio_priv->gpios_set);  in snd_soc_ac97_gpio_set()
104 	dev_dbg(component->dev, "set gpio %d to %d\n", offset, !!value);  in snd_soc_ac97_gpio_set()
112 	dev_dbg(component->dev, "set gpio %d to output\n", offset);  in snd_soc_ac97_gpio_direction_out()
135 	gpio_priv = devm_kzalloc(component->dev, sizeof(*gpio_priv), GFP_KERNEL);  in snd_soc_ac97_init_gpio()
137 		return -ENOMEM;  in snd_soc_ac97_init_gpio()
138 	ac97->gpio_priv = gpio_priv;  in snd_soc_ac97_init_gpio()
139 	gpio_priv->component = component;  in snd_soc_ac97_init_gpio()
140 	gpio_priv->gpio_chip = snd_soc_ac97_gpio_chip;  in snd_soc_ac97_init_gpio()
141 	gpio_priv->gpio_chip.ngpio = AC97_NUM_GPIOS;  in snd_soc_ac97_init_gpio()
142 	gpio_priv->gpio_chip.parent = component->dev;  in snd_soc_ac97_init_gpio()
143 	gpio_priv->gpio_chip.base = -1;  in snd_soc_ac97_init_gpio()
145 	ret = gpiochip_add_data(&gpio_priv->gpio_chip, gpio_priv);  in snd_soc_ac97_init_gpio()
147 		dev_err(component->dev, "Failed to add GPIOs: %d\n", ret);  in snd_soc_ac97_init_gpio()
153 	gpiochip_remove(&ac97->gpio_priv->gpio_chip);  in snd_soc_ac97_free_gpio()
168  * snd_soc_alloc_ac97_component() - Allocate new a AC'97 device
172  * it. The caller is responsible to either call device_add(&ac97->dev) to
173  * register the device, or to call put_device(&ac97->dev) to free the device.
183 		return ERR_PTR(-ENOMEM);  in snd_soc_alloc_ac97_component()
185 	ac97->bus = &soc_ac97_bus;  in snd_soc_alloc_ac97_component()
186 	ac97->num = 0;  in snd_soc_alloc_ac97_component()
188 	ac97->dev.bus = &ac97_bus_type;  in snd_soc_alloc_ac97_component()
189 	ac97->dev.parent = component->card->dev;  in snd_soc_alloc_ac97_component()
190 	ac97->dev.release = soc_ac97_device_release;  in snd_soc_alloc_ac97_component()
192 	dev_set_name(&ac97->dev, "%d-%d:%s",  in snd_soc_alloc_ac97_component()
193 		     component->card->snd_card->number, 0,  in snd_soc_alloc_ac97_component()
194 		     component->name);  in snd_soc_alloc_ac97_component()
196 	device_initialize(&ac97->dev);  in snd_soc_alloc_ac97_component()
203  * snd_soc_new_ac97_component - initailise AC97 device
208  * Initialises AC97 component resources for use by ad-hoc devices only.
210  * If @id is not 0 this function will reset the device, then read the ID from
229 			dev_err(component->dev, "Failed to reset AC97 device: %d\n",  in snd_soc_new_ac97_component()
235 	ret = device_add(&ac97->dev);  in snd_soc_new_ac97_component()
246 	put_device(&ac97->dev);  in snd_soc_new_ac97_component()
252  * snd_soc_free_ac97_component - free AC97 component device
260 	device_del(&ac97->dev);  in snd_soc_free_ac97_component()
261 	ac97->bus = NULL;  in snd_soc_free_ac97_component()
262 	put_device(&ac97->dev);  in snd_soc_free_ac97_component()
307 	int gpio;  in snd_soc_ac97_parse_pinctl()  local
315 	cfg->pctl = p;  in snd_soc_ac97_parse_pinctl()
317 	state = pinctrl_lookup_state(p, "ac97-reset");  in snd_soc_ac97_parse_pinctl()
319 		dev_err(dev, "Can't find pinctrl state ac97-reset\n");  in snd_soc_ac97_parse_pinctl()
322 	cfg->pstate_reset = state;  in snd_soc_ac97_parse_pinctl()
324 	state = pinctrl_lookup_state(p, "ac97-warm-reset");  in snd_soc_ac97_parse_pinctl()
326 		dev_err(dev, "Can't find pinctrl state ac97-warm-reset\n");  in snd_soc_ac97_parse_pinctl()
329 	cfg->pstate_warm_reset = state;  in snd_soc_ac97_parse_pinctl()
331 	state = pinctrl_lookup_state(p, "ac97-running");  in snd_soc_ac97_parse_pinctl()
333 		dev_err(dev, "Can't find pinctrl state ac97-running\n");  in snd_soc_ac97_parse_pinctl()
336 	cfg->pstate_run = state;  in snd_soc_ac97_parse_pinctl()
338 	gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 0);  in snd_soc_ac97_parse_pinctl()
339 	if (gpio < 0) {  in snd_soc_ac97_parse_pinctl()
340 		dev_err(dev, "Can't find ac97-sync gpio\n");  in snd_soc_ac97_parse_pinctl()
341 		return gpio;  in snd_soc_ac97_parse_pinctl()
343 	ret = devm_gpio_request(dev, gpio, "AC97 link sync");  in snd_soc_ac97_parse_pinctl()
345 		dev_err(dev, "Failed requesting ac97-sync gpio\n");  in snd_soc_ac97_parse_pinctl()
348 	cfg->gpio_sync = gpio;  in snd_soc_ac97_parse_pinctl()
350 	gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 1);  in snd_soc_ac97_parse_pinctl()
351 	if (gpio < 0) {  in snd_soc_ac97_parse_pinctl()
352 		dev_err(dev, "Can't find ac97-sdata gpio %d\n", gpio);  in snd_soc_ac97_parse_pinctl()
353 		return gpio;  in snd_soc_ac97_parse_pinctl()
355 	ret = devm_gpio_request(dev, gpio, "AC97 link sdata");  in snd_soc_ac97_parse_pinctl()
357 		dev_err(dev, "Failed requesting ac97-sdata gpio\n");  in snd_soc_ac97_parse_pinctl()
360 	cfg->gpio_sdata = gpio;  in snd_soc_ac97_parse_pinctl()
362 	gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 2);  in snd_soc_ac97_parse_pinctl()
363 	if (gpio < 0) {  in snd_soc_ac97_parse_pinctl()
364 		dev_err(dev, "Can't find ac97-reset gpio\n");  in snd_soc_ac97_parse_pinctl()
365 		return gpio;  in snd_soc_ac97_parse_pinctl()
367 	ret = devm_gpio_request(dev, gpio, "AC97 link reset");  in snd_soc_ac97_parse_pinctl()
369 		dev_err(dev, "Failed requesting ac97-reset gpio\n");  in snd_soc_ac97_parse_pinctl()
372 	cfg->gpio_reset = gpio;  in snd_soc_ac97_parse_pinctl()
386 		return -EBUSY;  in snd_soc_set_ac97_ops()
396  * snd_soc_set_ac97_ops_of_reset - Set ac97 ops with generic ac97 reset functions
398  * This function sets the reset and warm_reset properties of ops and parses
399  * the device node of pdev to get pinctrl states and gpio numbers to use.
404 	struct device *dev = &pdev->dev;  in snd_soc_set_ac97_ops_of_reset()
416 	ops->warm_reset = snd_soc_ac97_warm_reset;  in snd_soc_set_ac97_ops_of_reset()
417 	ops->reset = snd_soc_ac97_reset;  in snd_soc_set_ac97_ops_of_reset()