![Mark Brown](/assets/img/avatar_default.png)
This simplifies the driver by removing the need to manually configure dividers within the CPU and improve audio performance by ensuring that the optimal phase relationships between the clocks in the system are maintained. Note that currently this means that for playback to work the Output Mixer HiFi switch must be enabled since otherwise CODEC will not generate the DAC clock. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
342 lines
8.1 KiB
C
342 lines
8.1 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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static struct clk *mclk;
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static int at91sam9g20ek_startup(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
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struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
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int ret;
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ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK,
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MCLK_RATE, SND_SOC_CLOCK_IN);
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if (ret < 0) {
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clk_disable(mclk);
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return ret;
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}
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return 0;
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}
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static void at91sam9g20ek_shutdown(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
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dev_dbg(rtd->socdev->dev, "shutdown");
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}
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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->dai->codec_dai;
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struct snd_soc_dai *cpu_dai = rtd->dai->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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.startup = at91sam9g20ek_startup,
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.hw_params = at91sam9g20ek_hw_params,
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.shutdown = at91sam9g20ek_shutdown,
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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_codec *codec)
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{
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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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/* 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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/* always connected */
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snd_soc_dapm_enable_pin(codec, "Int Mic");
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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 = &atmel_ssc_dai[0],
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.codec_dai = &wm8731_dai,
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.init = at91sam9g20ek_wm8731_init,
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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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.platform = &atmel_soc_platform,
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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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/*
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* FIXME: This is a temporary bodge to avoid cross-tree merge issues.
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* New drivers should register the wm8731 I2C device in the machine
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* setup code (under arch/arm for ARM systems).
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*/
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static int wm8731_i2c_register(void)
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{
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struct i2c_board_info info;
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struct i2c_adapter *adapter;
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struct i2c_client *client;
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memset(&info, 0, sizeof(struct i2c_board_info));
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info.addr = 0x1b;
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strlcpy(info.type, "wm8731", I2C_NAME_SIZE);
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adapter = i2c_get_adapter(0);
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if (!adapter) {
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printk(KERN_ERR "can't get i2c adapter 0\n");
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return -ENODEV;
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}
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client = i2c_new_device(adapter, &info);
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i2c_put_adapter(adapter);
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if (!client) {
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printk(KERN_ERR "can't add i2c device at 0x%x\n",
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(unsigned int)info.addr);
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return -ENODEV;
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}
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return 0;
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}
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static struct snd_soc_device at91sam9g20ek_snd_devdata = {
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.card = &snd_soc_at91sam9g20ek,
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.codec_dev = &soc_codec_dev_wm8731,
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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 atmel_ssc_info *ssc_p = at91sam9g20ek_dai.cpu_dai->private_data;
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struct ssc_device *ssc = NULL;
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struct clk *pllb;
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int ret;
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if (!machine_is_at91sam9g20ek())
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return -ENODEV;
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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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/*
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* Request SSC device
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*/
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ssc = ssc_request(0);
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if (IS_ERR(ssc)) {
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printk(KERN_ERR "ASoC: Failed to request SSC 0\n");
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ret = PTR_ERR(ssc);
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ssc = NULL;
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goto err_ssc;
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}
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ssc_p->ssc = ssc;
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ret = wm8731_i2c_register();
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if (ret != 0)
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goto err_ssc;
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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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&at91sam9g20ek_snd_devdata);
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at91sam9g20ek_snd_devdata.dev = &at91sam9g20ek_snd_device->dev;
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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_ssc:
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ssc_free(ssc);
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ssc_p->ssc = NULL;
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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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struct atmel_ssc_info *ssc_p = at91sam9g20ek_dai.cpu_dai->private_data;
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struct ssc_device *ssc;
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if (ssc_p != NULL) {
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ssc = ssc_p->ssc;
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if (ssc != NULL)
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ssc_free(ssc);
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ssc_p->ssc = NULL;
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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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