278 lines
6.7 KiB
C
278 lines
6.7 KiB
C
/*
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* sam9g20_wm8731 -- SoC audio for AT91SAM9G20-based
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* ATMEL AT91SAM9G20ek board.
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*
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* Copyright (C) 2005 SAN People
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* Copyright (C) 2008 Atmel
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*
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* Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
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*
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* Based on ati_b1_wm8731.c by:
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* Frank Mandarino <fmandarino@endrelia.com>
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* Copyright 2006 Endrelia Technologies Inc.
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* Based on corgi.c by:
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* Copyright 2005 Wolfson Microelectronics PLC.
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* Copyright 2005 Openedhand Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/kernel.h>
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#include <linux/clk.h>
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#include <linux/timer.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/i2c.h>
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#include <linux/atmel-ssc.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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#include <sound/soc-dapm.h>
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#include <asm/mach-types.h>
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#include <mach/hardware.h>
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#include <mach/gpio.h>
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#include "../codecs/wm8731.h"
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#include "atmel-pcm.h"
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#include "atmel_ssc_dai.h"
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#define MCLK_RATE 12000000
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/*
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* As shipped the board does not have inputs. However, it is relatively
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* straightforward to modify the board to hook them up so support is left
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* in the driver.
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*/
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#undef ENABLE_MIC_INPUT
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static struct clk *mclk;
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static int at91sam9g20ek_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct snd_soc_dai *codec_dai = rtd->codec_dai;
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struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
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int ret;
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/* set codec DAI configuration */
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ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
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SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
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if (ret < 0)
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return ret;
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/* set cpu DAI configuration */
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ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
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SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
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if (ret < 0)
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return ret;
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return 0;
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}
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static struct snd_soc_ops at91sam9g20ek_ops = {
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.hw_params = at91sam9g20ek_hw_params,
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};
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static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card,
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enum snd_soc_bias_level level)
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{
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static int mclk_on;
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int ret = 0;
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switch (level) {
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case SND_SOC_BIAS_ON:
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case SND_SOC_BIAS_PREPARE:
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if (!mclk_on)
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ret = clk_enable(mclk);
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if (ret == 0)
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mclk_on = 1;
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break;
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case SND_SOC_BIAS_OFF:
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case SND_SOC_BIAS_STANDBY:
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if (mclk_on)
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clk_disable(mclk);
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mclk_on = 0;
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break;
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}
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return ret;
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}
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static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
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SND_SOC_DAPM_MIC("Int Mic", NULL),
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SND_SOC_DAPM_SPK("Ext Spk", NULL),
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};
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static const struct snd_soc_dapm_route intercon[] = {
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/* speaker connected to LHPOUT */
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{"Ext Spk", NULL, "LHPOUT"},
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/* mic is connected to Mic Jack, with WM8731 Mic Bias */
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{"MICIN", NULL, "Mic Bias"},
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{"Mic Bias", NULL, "Int Mic"},
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};
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/*
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* Logic for a wm8731 as connected on a at91sam9g20ek board.
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*/
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static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd)
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{
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struct snd_soc_codec *codec = rtd->codec;
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struct snd_soc_dai *codec_dai = rtd->codec_dai;
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int ret;
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printk(KERN_DEBUG
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"at91sam9g20ek_wm8731 "
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": at91sam9g20ek_wm8731_init() called\n");
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ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
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MCLK_RATE, SND_SOC_CLOCK_IN);
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if (ret < 0) {
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printk(KERN_ERR "Failed to set WM8731 SYSCLK: %d\n", ret);
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return ret;
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}
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/* Add specific widgets */
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snd_soc_dapm_new_controls(codec, at91sam9g20ek_dapm_widgets,
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ARRAY_SIZE(at91sam9g20ek_dapm_widgets));
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/* Set up specific audio path interconnects */
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snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
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/* not connected */
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snd_soc_dapm_nc_pin(codec, "RLINEIN");
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snd_soc_dapm_nc_pin(codec, "LLINEIN");
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#ifdef ENABLE_MIC_INPUT
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snd_soc_dapm_enable_pin(codec, "Int Mic");
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#else
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snd_soc_dapm_nc_pin(codec, "Int Mic");
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#endif
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/* always connected */
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snd_soc_dapm_enable_pin(codec, "Ext Spk");
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snd_soc_dapm_sync(codec);
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return 0;
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}
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static struct snd_soc_dai_link at91sam9g20ek_dai = {
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.name = "WM8731",
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.stream_name = "WM8731 PCM",
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.cpu_dai_name = "atmel-ssc-dai.0",
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.codec_dai_name = "wm8731-hifi",
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.init = at91sam9g20ek_wm8731_init,
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.platform_name = "atmel-pcm-audio",
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.codec_name = "wm8731-codec.0-001b",
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.ops = &at91sam9g20ek_ops,
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};
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static struct snd_soc_card snd_soc_at91sam9g20ek = {
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.name = "AT91SAMG20-EK",
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.dai_link = &at91sam9g20ek_dai,
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.num_links = 1,
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.set_bias_level = at91sam9g20ek_set_bias_level,
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};
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static struct platform_device *at91sam9g20ek_snd_device;
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static int __init at91sam9g20ek_init(void)
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{
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struct clk *pllb;
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int ret;
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if (!(machine_is_at91sam9g20ek() || machine_is_at91sam9g20ek_2mmc()))
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return -ENODEV;
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ret = atmel_ssc_set_audio(0);
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if (ret != 0) {
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pr_err("Failed to set SSC 0 for audio: %d\n", ret);
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return ret;
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}
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/*
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* Codec MCLK is supplied by PCK0 - set it up.
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*/
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mclk = clk_get(NULL, "pck0");
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if (IS_ERR(mclk)) {
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printk(KERN_ERR "ASoC: Failed to get MCLK\n");
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ret = PTR_ERR(mclk);
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goto err;
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}
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pllb = clk_get(NULL, "pllb");
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if (IS_ERR(mclk)) {
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printk(KERN_ERR "ASoC: Failed to get PLLB\n");
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ret = PTR_ERR(mclk);
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goto err_mclk;
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}
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ret = clk_set_parent(mclk, pllb);
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clk_put(pllb);
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if (ret != 0) {
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printk(KERN_ERR "ASoC: Failed to set MCLK parent\n");
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goto err_mclk;
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}
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clk_set_rate(mclk, MCLK_RATE);
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at91sam9g20ek_snd_device = platform_device_alloc("soc-audio", -1);
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if (!at91sam9g20ek_snd_device) {
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printk(KERN_ERR "ASoC: Platform device allocation failed\n");
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ret = -ENOMEM;
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}
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platform_set_drvdata(at91sam9g20ek_snd_device,
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&snd_soc_at91sam9g20ek);
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ret = platform_device_add(at91sam9g20ek_snd_device);
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if (ret) {
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printk(KERN_ERR "ASoC: Platform device allocation failed\n");
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platform_device_put(at91sam9g20ek_snd_device);
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}
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return ret;
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err_mclk:
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clk_put(mclk);
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mclk = NULL;
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err:
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return ret;
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}
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static void __exit at91sam9g20ek_exit(void)
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{
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platform_device_unregister(at91sam9g20ek_snd_device);
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at91sam9g20ek_snd_device = NULL;
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clk_put(mclk);
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mclk = NULL;
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}
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module_init(at91sam9g20ek_init);
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module_exit(at91sam9g20ek_exit);
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/* Module information */
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MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
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MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
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MODULE_LICENSE("GPL");
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