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>
57 	return gpio_priv->component;  in gpio_to_component()
63 		return -EINVAL;  in snd_soc_ac97_gpio_request()
73 	dev_dbg(component->dev, "set gpio %d to output\n", offset);  in snd_soc_ac97_gpio_direction_in()
85 	dev_dbg(component->dev, "get gpio %d : %d\n", offset,  in snd_soc_ac97_gpio_get()
97 	gpio_priv->gpios_set &= ~(1 << offset);  in snd_soc_ac97_gpio_set()
98 	gpio_priv->gpios_set |= (!!value) << offset;  in snd_soc_ac97_gpio_set()
100 				gpio_priv->gpios_set);  in snd_soc_ac97_gpio_set()
101 	dev_dbg(component->dev, "set gpio %d to %d\n", offset, !!value);  in snd_soc_ac97_gpio_set()
109 	dev_dbg(component->dev, "set gpio %d to output\n", offset);  in snd_soc_ac97_gpio_direction_out()
132 	gpio_priv = devm_kzalloc(component->dev, sizeof(*gpio_priv), GFP_KERNEL);  in snd_soc_ac97_init_gpio()
134 		return -ENOMEM;  in snd_soc_ac97_init_gpio()
135 	ac97->gpio_priv = gpio_priv;  in snd_soc_ac97_init_gpio()
136 	gpio_priv->component = component;  in snd_soc_ac97_init_gpio()
137 	gpio_priv->gpio_chip = snd_soc_ac97_gpio_chip;  in snd_soc_ac97_init_gpio()
138 	gpio_priv->gpio_chip.ngpio = AC97_NUM_GPIOS;  in snd_soc_ac97_init_gpio()
139 	gpio_priv->gpio_chip.parent = component->dev;  in snd_soc_ac97_init_gpio()
140 	gpio_priv->gpio_chip.base = -1;  in snd_soc_ac97_init_gpio()
142 	ret = gpiochip_add_data(&gpio_priv->gpio_chip, gpio_priv);  in snd_soc_ac97_init_gpio()
144 		dev_err(component->dev, "Failed to add GPIOs: %d\n", ret);  in snd_soc_ac97_init_gpio()
150 	gpiochip_remove(&ac97->gpio_priv->gpio_chip);  in snd_soc_ac97_free_gpio()
165  * snd_soc_alloc_ac97_component() - Allocate new a AC'97 device
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.
180 		return ERR_PTR(-ENOMEM);  in snd_soc_alloc_ac97_component()
182 	ac97->bus = &soc_ac97_bus;  in snd_soc_alloc_ac97_component()
183 	ac97->num = 0;  in snd_soc_alloc_ac97_component()
185 	ac97->dev.bus = &ac97_bus_type;  in snd_soc_alloc_ac97_component()
186 	ac97->dev.parent = component->card->dev;  in snd_soc_alloc_ac97_component()
187 	ac97->dev.release = soc_ac97_device_release;  in snd_soc_alloc_ac97_component()
189 	dev_set_name(&ac97->dev, "%d-%d:%s",  in snd_soc_alloc_ac97_component()
190 		     component->card->snd_card->number, 0,  in snd_soc_alloc_ac97_component()
191 		     component->name);  in snd_soc_alloc_ac97_component()
193 	device_initialize(&ac97->dev);  in snd_soc_alloc_ac97_component()
200  * snd_soc_new_ac97_component - initailise AC97 device
205  * Initialises AC97 component resources for use by ad-hoc devices only.
226 			dev_err(component->dev, "Failed to reset AC97 device: %d\n",  in snd_soc_new_ac97_component()
232 	ret = device_add(&ac97->dev);  in snd_soc_new_ac97_component()
243 	put_device(&ac97->dev);  in snd_soc_new_ac97_component()
249  * snd_soc_free_ac97_component - free AC97 component device
257 	device_del(&ac97->dev);  in snd_soc_free_ac97_component()
258 	ac97->bus = NULL;  in snd_soc_free_ac97_component()
259 	put_device(&ac97->dev);  in snd_soc_free_ac97_component()
300 		struct snd_ac97_reset_cfg *cfg)  in snd_soc_ac97_parse_pinctl()  argument
304 	int gpio;  in snd_soc_ac97_parse_pinctl()  local
312 	cfg->pctl = p;  in snd_soc_ac97_parse_pinctl()
314 	state = pinctrl_lookup_state(p, "ac97-reset");  in snd_soc_ac97_parse_pinctl()
316 		dev_err(dev, "Can't find pinctrl state ac97-reset\n");  in snd_soc_ac97_parse_pinctl()
319 	cfg->pstate_reset = state;  in snd_soc_ac97_parse_pinctl()
321 	state = pinctrl_lookup_state(p, "ac97-warm-reset");  in snd_soc_ac97_parse_pinctl()
323 		dev_err(dev, "Can't find pinctrl state ac97-warm-reset\n");  in snd_soc_ac97_parse_pinctl()
326 	cfg->pstate_warm_reset = state;  in snd_soc_ac97_parse_pinctl()
328 	state = pinctrl_lookup_state(p, "ac97-running");  in snd_soc_ac97_parse_pinctl()
330 		dev_err(dev, "Can't find pinctrl state ac97-running\n");  in snd_soc_ac97_parse_pinctl()
333 	cfg->pstate_run = state;  in snd_soc_ac97_parse_pinctl()
335 	gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 0);  in snd_soc_ac97_parse_pinctl()
336 	if (gpio < 0) {  in snd_soc_ac97_parse_pinctl()
337 		dev_err(dev, "Can't find ac97-sync gpio\n");  in snd_soc_ac97_parse_pinctl()
338 		return gpio;  in snd_soc_ac97_parse_pinctl()
340 	ret = devm_gpio_request(dev, gpio, "AC97 link sync");  in snd_soc_ac97_parse_pinctl()
342 		dev_err(dev, "Failed requesting ac97-sync gpio\n");  in snd_soc_ac97_parse_pinctl()
345 	cfg->gpio_sync = gpio;  in snd_soc_ac97_parse_pinctl()
347 	gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 1);  in snd_soc_ac97_parse_pinctl()
348 	if (gpio < 0) {  in snd_soc_ac97_parse_pinctl()
349 		dev_err(dev, "Can't find ac97-sdata gpio %d\n", gpio);  in snd_soc_ac97_parse_pinctl()
350 		return gpio;  in snd_soc_ac97_parse_pinctl()
352 	ret = devm_gpio_request(dev, gpio, "AC97 link sdata");  in snd_soc_ac97_parse_pinctl()
354 		dev_err(dev, "Failed requesting ac97-sdata gpio\n");  in snd_soc_ac97_parse_pinctl()
357 	cfg->gpio_sdata = gpio;  in snd_soc_ac97_parse_pinctl()
359 	gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 2);  in snd_soc_ac97_parse_pinctl()
360 	if (gpio < 0) {  in snd_soc_ac97_parse_pinctl()
361 		dev_err(dev, "Can't find ac97-reset gpio\n");  in snd_soc_ac97_parse_pinctl()
362 		return gpio;  in snd_soc_ac97_parse_pinctl()
364 	ret = devm_gpio_request(dev, gpio, "AC97 link reset");  in snd_soc_ac97_parse_pinctl()
366 		dev_err(dev, "Failed requesting ac97-reset gpio\n");  in snd_soc_ac97_parse_pinctl()
369 	cfg->gpio_reset = gpio;  in snd_soc_ac97_parse_pinctl()
383 		return -EBUSY;  in snd_soc_set_ac97_ops()
393  * snd_soc_set_ac97_ops_of_reset - Set ac97 ops with generic ac97 reset functions
398  * the device node of pdev to get pinctrl states and gpio numbers to use.
403 	struct device *dev = &pdev->dev;  in snd_soc_set_ac97_ops_of_reset()
404 	struct snd_ac97_reset_cfg cfg;  in snd_soc_set_ac97_ops_of_reset()  local
407 	ret = snd_soc_ac97_parse_pinctl(dev, &cfg);  in snd_soc_set_ac97_ops_of_reset()
415 	ops->warm_reset = snd_soc_ac97_warm_reset;  in snd_soc_set_ac97_ops_of_reset()
416 	ops->reset = snd_soc_ac97_reset;  in snd_soc_set_ac97_ops_of_reset()
418 	snd_ac97_rst_cfg = cfg;  in snd_soc_set_ac97_ops_of_reset()