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