/*
* 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>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#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 [31mCONFIG_GPIOLIB[0m
struct gpio_chip gpio_chip;
#endif
unsigned int gpios_set;
struct snd_soc_codec *codec;
};
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 [31mCONFIG_GPIOLIB[0m
static inline struct snd_soc_codec *gpio_to_codec(struct gpio_chip *chip)
{
struct snd_ac97_gpio_priv *gpio_priv = gpiochip_get_data(chip);
return gpio_priv->codec;
}
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_codec *codec = gpio_to_codec(chip);
dev_dbg(codec->dev, "set gpio %d to output\n", offset);
return snd_soc_update_bits(codec, AC97_GPIO_CFG,
1 << offset, 1 << offset);
}
static int snd_soc_ac97_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct snd_soc_codec *codec = gpio_to_codec(chip);
int ret;
ret = snd_soc_read(codec, AC97_GPIO_STATUS);
dev_dbg(codec->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_codec *codec = gpio_to_codec(chip);
gpio_priv->gpios_set &= ~(1 << offset);
gpio_priv->gpios_set |= (!!value) << offset;
snd_soc_write(codec, AC97_GPIO_STATUS, gpio_priv->gpios_set);
dev_dbg(codec->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_codec *codec = gpio_to_codec(chip);
dev_dbg(codec->dev, "set gpio %d to output\n", offset);
snd_soc_ac97_gpio_set(chip, offset, value);
return snd_soc_update_bits(codec, 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_codec *codec)
{
struct snd_ac97_gpio_priv *gpio_priv;
int ret;
gpio_priv = devm_kzalloc(codec->dev, sizeof(*gpio_priv), GFP_KERNEL);
if (!gpio_priv)
return -ENOMEM;
ac97->gpio_priv = gpio_priv;
gpio_priv->codec = codec;
gpio_priv->gpio_chip = snd_soc_ac97_gpio_chip;
gpio_priv->gpio_chip.ngpio = AC97_NUM_GPIOS;
gpio_priv->gpio_chip.parent = codec->dev;
gpio_priv->gpio_chip.base = -1;
ret = gpiochip_add_data(&gpio_priv->gpio_chip, gpio_priv);
if (ret != 0)
dev_err(codec->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_codec *codec)
{
return 0;
}
static void snd_soc_ac97_free_gpio(struct snd_ac97 *ac97)
{
}
#endif
/**
* snd_soc_alloc_ac97_codec() - Allocate new a AC'97 device
* @codec: The CODEC 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_codec(struct snd_soc_codec *codec)
{
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 = codec->component.card->dev;
ac97->dev.release = soc_ac97_device_release;
dev_set_name(&ac97->dev, "%d-%d:%s",
codec->component.card->snd_card->number, 0,
codec->component.name);
device_initialize(&ac97->dev);
return ac97;
}
EXPORT_SYMBOL(snd_soc_alloc_ac97_codec);
/**
* snd_soc_new_ac97_codec - initailise AC97 device
* @codec: audio codec
* @id: The expected device ID
* @id_mask: Mask that is applied to the device ID before comparing with @id
*
* Initialises AC97 codec 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_codec(struct snd_soc_codec *codec,
unsigned int id, unsigned int id_mask)
{
struct snd_ac97 *ac97;
int ret;
ac97 = snd_soc_alloc_ac97_codec(codec);
if (IS_ERR(ac97))
return ac97;
if (id) {
ret = snd_ac97_reset(ac97, false, id, id_mask);
if (ret < 0) {
dev_err(codec->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, codec);
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_codec);
/**
* snd_soc_free_ac97_codec - free AC97 codec device
* @codec: audio codec
*
* Frees AC97 codec device resources.
*/
void snd_soc_free_ac97_codec(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_codec);
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);