/*
* 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/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;
};
/* unregister ac97 codec */
static int soc_ac97_dev_unregister(struct snd_soc_codec *codec)
{
if (codec->ac97->dev.bus)
device_del(&codec->ac97->dev);
return 0;
}
/* register ac97 codec to bus */
static int soc_ac97_dev_register(struct snd_soc_codec *codec)
{
int err;
codec->ac97->dev.bus = &ac97_bus_type;
codec->ac97->dev.parent = codec->component.card->dev;
dev_set_name(&codec->ac97->dev, "%d-%d:%s",
codec->component.card->snd_card->number, 0,
codec->component.name);
err = device_add(&codec->ac97->dev);
if (err < 0) {
dev_err(codec->dev, "ASoC: Can't register ac97 bus\n");
codec->ac97->dev.bus = NULL;
return err;
}
return 0;
}
static int soc_register_ac97_codec(struct snd_soc_codec *codec,
struct snd_soc_dai *codec_dai)
{
int ret;
/* Only instantiate AC97 if not already done by the adaptor
* for the generic AC97 subsystem.
*/
if (codec_dai->driver->ac97_control && !codec->ac97_registered) {
/*
* It is possible that the AC97 device is already registered to
* the device subsystem. This happens when the device is created
* via snd_ac97_mixer(). Currently only SoC codec that does so
* is the generic AC97 glue but others migh emerge.
*
* In those cases we don't try to register the device again.
*/
if (!codec->ac97_created)
return 0;
ret = soc_ac97_dev_register(codec);
if (ret < 0) {
dev_err(codec->dev,
"ASoC: AC97 device register failed: %d\n", ret);
return ret;
}
codec->ac97_registered = 1;
}
return 0;
}
static void soc_unregister_ac97_codec(struct snd_soc_codec *codec)
{
if (codec->ac97_registered) {
soc_ac97_dev_unregister(codec);
codec->ac97_registered = 0;
}
}
static int soc_register_ac97_dai_link(struct snd_soc_pcm_runtime *rtd)
{
int i, ret;
for (i = 0; i < rtd->num_codecs; i++) {
struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
ret = soc_register_ac97_codec(codec_dai->codec, codec_dai);
if (ret) {
while (--i >= 0)
soc_unregister_ac97_codec(codec_dai->codec);
return ret;
}
}
return 0;
}
static void soc_unregister_ac97_dai_link(struct snd_soc_pcm_runtime *rtd)
{
int i;
for (i = 0; i < rtd->num_codecs; i++)
soc_unregister_ac97_codec(rtd->codec_dais[i]->codec);
}
static void soc_ac97_device_release(struct device *dev)
{
kfree(to_ac97_t(dev));
}
/**
* snd_soc_new_ac97_codec - initailise AC97 device
* @codec: audio codec
* @ops: AC97 bus operations
* @num: AC97 codec number
*
* Initialises AC97 codec resources for use by ad-hoc devices only.
*/
int snd_soc_new_ac97_codec(struct snd_soc_codec *codec,
struct snd_ac97_bus_ops *ops, int num)
{
codec->ac97 = kzalloc(sizeof(struct snd_ac97), GFP_KERNEL);
if (codec->ac97 == NULL)
return -ENOMEM;
codec->ac97->bus = kzalloc(sizeof(struct snd_ac97_bus), GFP_KERNEL);
if (codec->ac97->bus == NULL) {
kfree(codec->ac97);
codec->ac97 = NULL;
return -ENOMEM;
}
codec->ac97->bus->ops = ops;
codec->ac97->num = num;
codec->ac97->dev.release = soc_ac97_device_release;
/*
* Mark the AC97 device to be created by us. This way we ensure that the
* device will be registered with the device subsystem later on.
*/
codec->ac97_created = 1;
device_initialize(&codec->ac97->dev);
return 0;
}
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_soc_codec *codec)
{
soc_unregister_ac97_codec(codec);
kfree(codec->ac97->bus);
codec->ac97->bus = NULL;
put_device(&codec->ac97->dev);
codec->ac97 = NULL;
codec->ac97_created = 0;
}
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;
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);
int snd_soc_ac97_register_dai_links(struct snd_soc_card *card)
{
int i;
int ret;
/* register any AC97 codecs */
for (i = 0; i < card->num_rtd; i++) {
ret = soc_register_ac97_dai_link(&card->rtd[i]);
if (ret < 0)
goto err;
}
return 0;
err:
dev_err(card->dev,
"ASoC: failed to register AC97: %d\n", ret);
while (--i >= 0)
soc_unregister_ac97_dai_link(&card->rtd[i]);
return ret;
}
void snd_soc_ac97_add_pdata(struct snd_soc_pcm_runtime *rtd)
{
unsigned int i;
/* add platform data for AC97 devices */
for (i = 0; i < rtd->num_codecs; i++) {
if (rtd->codec_dais[i]->driver->ac97_control)
snd_ac97_dev_add_pdata(rtd->codec_dais[i]->codec->ac97,
rtd->cpu_dai->ac97_pdata);
}
}
