diff options
Diffstat (limited to '')
| -rw-r--r-- | sound/soc/soc-ac97.c | 422 |
1 files changed, 422 insertions, 0 deletions
diff --git a/sound/soc/soc-ac97.c b/sound/soc/soc-ac97.c new file mode 100644 index 000000000..c086786e4 --- /dev/null +++ b/sound/soc/soc-ac97.c @@ -0,0 +1,422 @@ +// SPDX-License-Identifier: GPL-2.0+ +// +// soc-ac97.c -- ALSA SoC Audio Layer AC97 support +// +// Copyright 2005 Wolfson Microelectronics PLC. +// Copyright 2005 Openedhand Ltd. +// Copyright (C) 2010 Slimlogic Ltd. +// Copyright (C) 2010 Texas Instruments Inc. +// +// Author: Liam Girdwood <lrg@slimlogic.co.uk> +// with code, comments and ideas from :- +// Richard Purdie <richard@openedhand.com> + +#include <linux/ctype.h> +#include <linux/delay.h> +#include <linux/export.h> +#include <linux/gpio.h> +#include <linux/gpio/driver.h> +#include <linux/init.h> +#include <linux/of_gpio.h> +#include <linux/of.h> +#include <linux/pinctrl/consumer.h> +#include <linux/slab.h> +#include <sound/ac97_codec.h> +#include <sound/soc.h> + +struct snd_ac97_reset_cfg { + struct pinctrl *pctl; + struct pinctrl_state *pstate_reset; + struct pinctrl_state *pstate_warm_reset; + struct pinctrl_state *pstate_run; + int gpio_sdata; + int gpio_sync; + int gpio_reset; +}; + +struct snd_ac97_gpio_priv { +#ifdef CONFIG_GPIOLIB + struct gpio_chip gpio_chip; +#endif + unsigned int gpios_set; + struct snd_soc_component *component; +}; + +static struct snd_ac97_bus soc_ac97_bus = { + .ops = NULL, /* Gets initialized in snd_soc_set_ac97_ops() */ +}; + +static void soc_ac97_device_release(struct device *dev) +{ + kfree(to_ac97_t(dev)); +} + +#ifdef CONFIG_GPIOLIB +static inline struct snd_soc_component *gpio_to_component(struct gpio_chip *chip) +{ + struct snd_ac97_gpio_priv *gpio_priv = gpiochip_get_data(chip); + + return gpio_priv->component; +} + +static int snd_soc_ac97_gpio_request(struct gpio_chip *chip, unsigned offset) +{ + if (offset >= AC97_NUM_GPIOS) + return -EINVAL; + + return 0; +} + +static int snd_soc_ac97_gpio_direction_in(struct gpio_chip *chip, + unsigned offset) +{ + struct snd_soc_component *component = gpio_to_component(chip); + + dev_dbg(component->dev, "set gpio %d to output\n", offset); + return snd_soc_component_update_bits(component, AC97_GPIO_CFG, + 1 << offset, 1 << offset); +} + +static int snd_soc_ac97_gpio_get(struct gpio_chip *chip, unsigned offset) +{ + struct snd_soc_component *component = gpio_to_component(chip); + int ret; + + if (snd_soc_component_read(component, AC97_GPIO_STATUS, &ret) < 0) + ret = -1; + + dev_dbg(component->dev, "get gpio %d : %d\n", offset, + ret < 0 ? ret : ret & (1 << offset)); + + return ret < 0 ? ret : !!(ret & (1 << offset)); +} + +static void snd_soc_ac97_gpio_set(struct gpio_chip *chip, unsigned offset, + int value) +{ + struct snd_ac97_gpio_priv *gpio_priv = gpiochip_get_data(chip); + struct snd_soc_component *component = gpio_to_component(chip); + + gpio_priv->gpios_set &= ~(1 << offset); + gpio_priv->gpios_set |= (!!value) << offset; + snd_soc_component_write(component, AC97_GPIO_STATUS, + gpio_priv->gpios_set); + dev_dbg(component->dev, "set gpio %d to %d\n", offset, !!value); +} + +static int snd_soc_ac97_gpio_direction_out(struct gpio_chip *chip, + unsigned offset, int value) +{ + struct snd_soc_component *component = gpio_to_component(chip); + + dev_dbg(component->dev, "set gpio %d to output\n", offset); + snd_soc_ac97_gpio_set(chip, offset, value); + return snd_soc_component_update_bits(component, AC97_GPIO_CFG, + 1 << offset, 0); +} + +static const struct gpio_chip snd_soc_ac97_gpio_chip = { + .label = "snd_soc_ac97", + .owner = THIS_MODULE, + .request = snd_soc_ac97_gpio_request, + .direction_input = snd_soc_ac97_gpio_direction_in, + .get = snd_soc_ac97_gpio_get, + .direction_output = snd_soc_ac97_gpio_direction_out, + .set = snd_soc_ac97_gpio_set, + .can_sleep = 1, +}; + +static int snd_soc_ac97_init_gpio(struct snd_ac97 *ac97, + struct snd_soc_component *component) +{ + struct snd_ac97_gpio_priv *gpio_priv; + int ret; + + gpio_priv = devm_kzalloc(component->dev, sizeof(*gpio_priv), GFP_KERNEL); + if (!gpio_priv) + return -ENOMEM; + ac97->gpio_priv = gpio_priv; + gpio_priv->component = component; + gpio_priv->gpio_chip = snd_soc_ac97_gpio_chip; + gpio_priv->gpio_chip.ngpio = AC97_NUM_GPIOS; + gpio_priv->gpio_chip.parent = component->dev; + gpio_priv->gpio_chip.base = -1; + + ret = gpiochip_add_data(&gpio_priv->gpio_chip, gpio_priv); + if (ret != 0) + dev_err(component->dev, "Failed to add GPIOs: %d\n", ret); + return ret; +} + +static void snd_soc_ac97_free_gpio(struct snd_ac97 *ac97) +{ + gpiochip_remove(&ac97->gpio_priv->gpio_chip); +} +#else +static int snd_soc_ac97_init_gpio(struct snd_ac97 *ac97, + struct snd_soc_component *component) +{ + return 0; +} + +static void snd_soc_ac97_free_gpio(struct snd_ac97 *ac97) +{ +} +#endif + +/** + * snd_soc_alloc_ac97_component() - Allocate new a AC'97 device + * @component: The COMPONENT for which to create the AC'97 device + * + * Allocated a new snd_ac97 device and intializes it, but does not yet register + * it. The caller is responsible to either call device_add(&ac97->dev) to + * register the device, or to call put_device(&ac97->dev) to free the device. + * + * Returns: A snd_ac97 device or a PTR_ERR in case of an error. + */ +struct snd_ac97 *snd_soc_alloc_ac97_component(struct snd_soc_component *component) +{ + struct snd_ac97 *ac97; + + ac97 = kzalloc(sizeof(struct snd_ac97), GFP_KERNEL); + if (ac97 == NULL) + return ERR_PTR(-ENOMEM); + + ac97->bus = &soc_ac97_bus; + ac97->num = 0; + + ac97->dev.bus = &ac97_bus_type; + ac97->dev.parent = component->card->dev; + ac97->dev.release = soc_ac97_device_release; + + dev_set_name(&ac97->dev, "%d-%d:%s", + component->card->snd_card->number, 0, + component->name); + + device_initialize(&ac97->dev); + + return ac97; +} +EXPORT_SYMBOL(snd_soc_alloc_ac97_component); + +/** + * snd_soc_new_ac97_component - initailise AC97 device + * @component: audio component + * @id: The expected device ID + * @id_mask: Mask that is applied to the device ID before comparing with @id + * + * Initialises AC97 component resources for use by ad-hoc devices only. + * + * If @id is not 0 this function will reset the device, then read the ID from + * the device and check if it matches the expected ID. If it doesn't match an + * error will be returned and device will not be registered. + * + * Returns: A PTR_ERR() on failure or a valid snd_ac97 struct on success. + */ +struct snd_ac97 *snd_soc_new_ac97_component(struct snd_soc_component *component, + unsigned int id, unsigned int id_mask) +{ + struct snd_ac97 *ac97; + int ret; + + ac97 = snd_soc_alloc_ac97_component(component); + if (IS_ERR(ac97)) + return ac97; + + if (id) { + ret = snd_ac97_reset(ac97, false, id, id_mask); + if (ret < 0) { + dev_err(component->dev, "Failed to reset AC97 device: %d\n", + ret); + goto err_put_device; + } + } + + ret = device_add(&ac97->dev); + if (ret) + goto err_put_device; + + ret = snd_soc_ac97_init_gpio(ac97, component); + if (ret) + goto err_put_device; + + return ac97; + +err_put_device: + put_device(&ac97->dev); + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(snd_soc_new_ac97_component); + +/** + * snd_soc_free_ac97_component - free AC97 component device + * @ac97: snd_ac97 device to be freed + * + * Frees AC97 component device resources. + */ +void snd_soc_free_ac97_component(struct snd_ac97 *ac97) +{ + snd_soc_ac97_free_gpio(ac97); + device_del(&ac97->dev); + ac97->bus = NULL; + put_device(&ac97->dev); +} +EXPORT_SYMBOL_GPL(snd_soc_free_ac97_component); + +static struct snd_ac97_reset_cfg snd_ac97_rst_cfg; + +static void snd_soc_ac97_warm_reset(struct snd_ac97 *ac97) +{ + struct pinctrl *pctl = snd_ac97_rst_cfg.pctl; + + pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_warm_reset); + + gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 1); + + udelay(10); + + gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0); + + pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run); + msleep(2); +} + +static void snd_soc_ac97_reset(struct snd_ac97 *ac97) +{ + struct pinctrl *pctl = snd_ac97_rst_cfg.pctl; + + pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_reset); + + gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0); + gpio_direction_output(snd_ac97_rst_cfg.gpio_sdata, 0); + gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 0); + + udelay(10); + + gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 1); + + pinctrl_select_state(pctl, snd_ac97_rst_cfg.pstate_run); + msleep(2); +} + +static int snd_soc_ac97_parse_pinctl(struct device *dev, + struct snd_ac97_reset_cfg *cfg) +{ + struct pinctrl *p; + struct pinctrl_state *state; + int gpio; + int ret; + + p = devm_pinctrl_get(dev); + if (IS_ERR(p)) { + dev_err(dev, "Failed to get pinctrl\n"); + return PTR_ERR(p); + } + cfg->pctl = p; + + state = pinctrl_lookup_state(p, "ac97-reset"); + if (IS_ERR(state)) { + dev_err(dev, "Can't find pinctrl state ac97-reset\n"); + return PTR_ERR(state); + } + cfg->pstate_reset = state; + + state = pinctrl_lookup_state(p, "ac97-warm-reset"); + if (IS_ERR(state)) { + dev_err(dev, "Can't find pinctrl state ac97-warm-reset\n"); + return PTR_ERR(state); + } + cfg->pstate_warm_reset = state; + + state = pinctrl_lookup_state(p, "ac97-running"); + if (IS_ERR(state)) { + dev_err(dev, "Can't find pinctrl state ac97-running\n"); + return PTR_ERR(state); + } + cfg->pstate_run = state; + + gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 0); + if (gpio < 0) { + dev_err(dev, "Can't find ac97-sync gpio\n"); + return gpio; + } + ret = devm_gpio_request(dev, gpio, "AC97 link sync"); + if (ret) { + dev_err(dev, "Failed requesting ac97-sync gpio\n"); + return ret; + } + cfg->gpio_sync = gpio; + + gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 1); + if (gpio < 0) { + dev_err(dev, "Can't find ac97-sdata gpio %d\n", gpio); + return gpio; + } + ret = devm_gpio_request(dev, gpio, "AC97 link sdata"); + if (ret) { + dev_err(dev, "Failed requesting ac97-sdata gpio\n"); + return ret; + } + cfg->gpio_sdata = gpio; + + gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 2); + if (gpio < 0) { + dev_err(dev, "Can't find ac97-reset gpio\n"); + return gpio; + } + ret = devm_gpio_request(dev, gpio, "AC97 link reset"); + if (ret) { + dev_err(dev, "Failed requesting ac97-reset gpio\n"); + return ret; + } + cfg->gpio_reset = gpio; + + return 0; +} + +struct snd_ac97_bus_ops *soc_ac97_ops; +EXPORT_SYMBOL_GPL(soc_ac97_ops); + +int snd_soc_set_ac97_ops(struct snd_ac97_bus_ops *ops) +{ + if (ops == soc_ac97_ops) + return 0; + + if (soc_ac97_ops && ops) + return -EBUSY; + + soc_ac97_ops = ops; + soc_ac97_bus.ops = ops; + + return 0; +} +EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops); + +/** + * snd_soc_set_ac97_ops_of_reset - Set ac97 ops with generic ac97 reset functions + * + * This function sets the reset and warm_reset properties of ops and parses + * the device node of pdev to get pinctrl states and gpio numbers to use. + */ +int snd_soc_set_ac97_ops_of_reset(struct snd_ac97_bus_ops *ops, + struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct snd_ac97_reset_cfg cfg; + int ret; + + ret = snd_soc_ac97_parse_pinctl(dev, &cfg); + if (ret) + return ret; + + ret = snd_soc_set_ac97_ops(ops); + if (ret) + return ret; + + ops->warm_reset = snd_soc_ac97_warm_reset; + ops->reset = snd_soc_ac97_reset; + + snd_ac97_rst_cfg = cfg; + return 0; +} +EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops_of_reset); |