281 lines
6.7 KiB
C
281 lines
6.7 KiB
C
/*
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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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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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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.h>
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#include <linux/init.h>
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#include <linux/of_gpio.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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int gpio_sdata;
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int gpio_sync;
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int gpio_reset;
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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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/**
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* snd_soc_alloc_ac97_codec() - Allocate new a AC'97 device
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* @codec: The CODEC 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_codec(struct snd_soc_codec *codec)
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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 = codec->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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codec->component.card->snd_card->number, 0,
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codec->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_codec);
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/**
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* snd_soc_new_ac97_codec - initailise AC97 device
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* @codec: audio codec
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*
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* Initialises AC97 codec resources for use by ad-hoc devices only.
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*/
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struct snd_ac97 *snd_soc_new_ac97_codec(struct snd_soc_codec *codec)
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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_codec(codec);
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if (IS_ERR(ac97))
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return ac97;
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ret = device_add(&ac97->dev);
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if (ret) {
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put_device(&ac97->dev);
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return ERR_PTR(ret);
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}
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return ac97;
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}
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EXPORT_SYMBOL_GPL(snd_soc_new_ac97_codec);
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/**
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* snd_soc_free_ac97_codec - free AC97 codec device
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* @codec: audio codec
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*
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* Frees AC97 codec device resources.
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*/
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void snd_soc_free_ac97_codec(struct snd_ac97 *ac97)
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{
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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_codec);
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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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gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 1);
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udelay(10);
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gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 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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gpio_direction_output(snd_ac97_rst_cfg.gpio_sync, 0);
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gpio_direction_output(snd_ac97_rst_cfg.gpio_sdata, 0);
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gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 0);
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udelay(10);
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gpio_direction_output(snd_ac97_rst_cfg.gpio_reset, 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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int gpio;
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int ret;
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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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gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 0);
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if (gpio < 0) {
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dev_err(dev, "Can't find ac97-sync gpio\n");
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return gpio;
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}
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ret = devm_gpio_request(dev, gpio, "AC97 link sync");
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if (ret) {
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dev_err(dev, "Failed requesting ac97-sync gpio\n");
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return ret;
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}
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cfg->gpio_sync = gpio;
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gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 1);
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if (gpio < 0) {
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dev_err(dev, "Can't find ac97-sdata gpio %d\n", gpio);
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return gpio;
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}
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ret = devm_gpio_request(dev, gpio, "AC97 link sdata");
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if (ret) {
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dev_err(dev, "Failed requesting ac97-sdata gpio\n");
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return ret;
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}
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cfg->gpio_sdata = gpio;
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gpio = of_get_named_gpio(dev->of_node, "ac97-gpios", 2);
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if (gpio < 0) {
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dev_err(dev, "Can't find ac97-reset gpio\n");
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return gpio;
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}
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ret = devm_gpio_request(dev, gpio, "AC97 link reset");
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if (ret) {
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dev_err(dev, "Failed requesting ac97-reset gpio\n");
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return ret;
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}
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cfg->gpio_reset = gpio;
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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;
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if (soc_ac97_ops && ops)
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return -EBUSY;
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soc_ac97_ops = ops;
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soc_ac97_bus.ops = ops;
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return 0;
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}
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EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops);
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/**
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* snd_soc_set_ac97_ops_of_reset - Set ac97 ops with generic ac97 reset functions
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*
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* This function sets the reset and warm_reset properties of ops and parses
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* the device node of pdev to get pinctrl states and gpio numbers to use.
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*/
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int snd_soc_set_ac97_ops_of_reset(struct snd_ac97_bus_ops *ops,
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struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct snd_ac97_reset_cfg cfg;
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int ret;
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ret = snd_soc_ac97_parse_pinctl(dev, &cfg);
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if (ret)
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return ret;
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ret = snd_soc_set_ac97_ops(ops);
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if (ret)
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return ret;
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ops->warm_reset = snd_soc_ac97_warm_reset;
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ops->reset = snd_soc_ac97_reset;
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snd_ac97_rst_cfg = cfg;
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return 0;
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}
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EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops_of_reset);
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