422 lines
11 KiB
C
422 lines
11 KiB
C
// 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;
|
|
};
|
|
|
|
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
|
|
struct snd_ac97_gpio_priv {
|
|
struct gpio_chip gpio_chip;
|
|
unsigned int gpios_set;
|
|
struct snd_soc_component *component;
|
|
};
|
|
|
|
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 int offset)
|
|
{
|
|
if (offset >= AC97_NUM_GPIOS)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int snd_soc_ac97_gpio_direction_in(struct gpio_chip *chip,
|
|
unsigned int 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 int offset)
|
|
{
|
|
struct snd_soc_component *component = gpio_to_component(chip);
|
|
int ret;
|
|
|
|
ret = snd_soc_component_read(component, AC97_GPIO_STATUS);
|
|
|
|
dev_dbg(component->dev, "get gpio %d : %d\n", offset,
|
|
ret & (1 << offset));
|
|
|
|
return !!(ret & (1 << offset));
|
|
}
|
|
|
|
static void snd_soc_ac97_gpio_set(struct gpio_chip *chip, unsigned int 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
|
|
* @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);
|