[alsa-devel] wm8974 and sam9g45 atmel
Michele Da Rold
michele.darold at ecsproject.com
Thu Jun 9 17:11:48 CEST 2011
Hello everybody, I'm starting a new development with a Atmel SAM9G45 and
a WM8974.
I'm using kernel 2.6.33.2
I have connected the SSC1 pin TD,TF,TK and the RD pin, so I want to use
WM8974 like a slave.
I wrote a interface driver based on sam9263_wm8731.c
The driver seem to load ok, I recognize the codec but when I start a mp3
playing (I use mpg123) the playback not start.
Putting some dedug messagge the driver not call the function
"set_bias_level", and call the mute function with mute=0.
Testing the MCLK signal I not see any clock on pin because I never call
clk_enable!!
There is a way to identify the problem?
Someone could help me?
Thank you in advance
Michele Da Rold
I put the code of driver (don't care about printk I used it for debug
purpose!!)
/*
* sam9g45_wm8974 -- SoC audio for AT91SAM9G20-based
* ATMEL AT91SAM9G20ek board.
*
* Copyright (C) 2005 SAN People
* Copyright (C) 2008 Atmel
*
* Authors: Sedji Gaouaou <sedji.gaouaou at atmel.com>
*
* Based on sam9263_wm8731.c.
* Frank Mandarino <fmandarino at endrelia.com>
* Copyright 2006 Endrelia Technologies Inc.
* Based on corgi.c by:
* Copyright 2005 Wolfson Microelectronics PLC.
* Copyright 2005 Openedhand Ltd.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <linux/atmel-ssc.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <asm/mach-types.h>
#include <mach/hardware.h>
#include <mach/gpio.h>
#include "../codecs/wm8974.h"
#include "atmel-pcm.h"
#include "atmel_ssc_dai.h"
#define MCLK_RATE 12000000
/*
* As shipped the board does not have inputs. However, it is relatively
* straightforward to modify the board to hook them up so support is left
* in the driver.
*/
#undef ENABLE_MIC_INPUT
#define ENABLE_MIC_INPUT 1
static struct clk *mclk;
static int at91sam9g45ek_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
int ret;
printk(KERN_DEBUG
"at91sam9g45_wm8974 "
": at91sam9g45ek_hw_params() called\n");
/* set codec DAI configuration */
ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS/*SND_SOC_DAIFMT_CBM_CFM*/);
if (ret < 0)
return ret;
/* set cpu DAI configuration */
ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS/*SND_SOC_DAIFMT_CBM_CFM*/);
if (ret < 0)
return ret;
return 0;
}
static struct snd_soc_ops at91sam9g45ek_ops = {
.hw_params = at91sam9g45ek_hw_params,
};
static int at91sam9g45ek_set_bias_level(struct snd_soc_card *card,
enum snd_soc_bias_level level)
{
static int mclk_on;
int ret = 0;
printk(KERN_DEBUG
"at91sam9g45_wm8974 "
": at91sam9g45ek_set_bias_level() called %d\n",level);
switch (level) {
case SND_SOC_BIAS_ON:
case SND_SOC_BIAS_PREPARE:
if (!mclk_on)
ret = clk_enable(mclk);
if (ret == 0)
mclk_on = 1;
break;
case SND_SOC_BIAS_OFF:
case SND_SOC_BIAS_STANDBY:
if (mclk_on)
clk_disable(mclk);
mclk_on = 0;
break;
}
return ret;
}
#if 0
static const struct snd_soc_dapm_widget at91sam9g45ek_dapm_widgets[] = {
SND_SOC_DAPM_MIC("Int Mic", NULL),
SND_SOC_DAPM_SPK("Ext Spk", NULL),
};
static const struct snd_soc_dapm_route intercon[] = {
/* Speaker output mixer */
{"Speaker Mixer", "PCM Playback Switch", "DAC"},
{"Speaker Mixer", "Aux Playback Switch", "Aux Input"},
{"Speaker Mixer", "Line Bypass Switch", "Boost Mixer"},
/* speaker connected to SPKOUTP */
{"SpkN Out", NULL, "Speaker Mixer"},
{"SpkP Out", NULL, "Speaker Mixer"},
{"SPKOUTN", NULL, "SpkN Out"},
{"SPKOUTP", NULL, "SpkP Out"},
/* Input PGA */
{"Input PGA", "Aux Switch", "Aux Input"},
{"Input PGA", "MicN Switch", "MICN"},
{"Input PGA", "MicP Switch", "MICP"},
};
/*
* Logic for a wm974 as connected on a at91sam9g45ek board.
*/
static int at91sam9g45ek_wm8974_init(struct snd_soc_codec *codec)
{
struct snd_soc_dai *codec_dai = &codec->dai[0];
int ret;
printk(KERN_DEBUG
"at91sam9g45_wm8974 "
": at91sam9g45_wm8974_init() called\n");
/*
ret = snd_soc_dai_set_sysclk(codec_dai, 0,
MCLK_RATE, SND_SOC_CLOCK_IN);
if (ret < 0) {
printk(KERN_ERR "Failed to set WM8974 SYSCLK: %d\n", ret);
return ret;
}
*/
/* Add specific widgets */
snd_soc_dapm_new_controls(codec, at91sam9g45ek_dapm_widgets,
ARRAY_SIZE(at91sam9g45ek_dapm_widgets));
/* Set up specific audio path interconnects */
snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
/* not connected */
snd_soc_dapm_nc_pin(codec, "MONOOUT");
snd_soc_dapm_nc_pin(codec, "AUX");
#ifdef ENABLE_MIC_INPUT
snd_soc_dapm_enable_pin(codec, "Int Mic");
#else
snd_soc_dapm_nc_pin(codec, "Int Mic");
#endif
/* always connected */
snd_soc_dapm_enable_pin(codec, "Ext Spk");
snd_soc_dapm_sync(codec);
return 0;
}
#endif
static struct snd_soc_dai_link at91sam9g45ek_dai = {
.name = "WM8974",
.stream_name = "WM8974 PCM",
.cpu_dai = &atmel_ssc_dai[1],
.codec_dai = &wm8974_dai,
#if 0
.init = at91sam9g45ek_wm8974_init,
#endif
.ops = &at91sam9g45ek_ops,
};
static struct snd_soc_card snd_soc_at91sam9g45ek = {
.name = "AT91SAMG45",
.platform = &atmel_soc_platform,
.dai_link = &at91sam9g45ek_dai,
.num_links = 1,
.set_bias_level = at91sam9g45ek_set_bias_level,
};
static struct snd_soc_device at91sam9g45ek_snd_devdata = {
.card = &snd_soc_at91sam9g45ek,
.codec_dev = &soc_codec_dev_wm8974,
};
static struct platform_device *at91sam9g45ek_snd_device;
static int __init at91sam9g45ek_init(void)
{
struct atmel_ssc_info *ssc_p = at91sam9g45ek_dai.cpu_dai->private_data;
struct ssc_device *ssc = NULL;
struct clk *main;
int ret;
at91_set_A_periph(AT91_PIN_PD27, 0);
/*
* Codec MCLK is supplied by PCK1 - set it up.
*/
mclk = clk_get(NULL, "pck1");
if (IS_ERR(mclk)) {
printk(KERN_ERR "ASoC: Failed to get MCLK\n");
ret = PTR_ERR(mclk);
goto err;
}
main = clk_get(NULL, "main");
if (IS_ERR(main)) {
printk(KERN_ERR "ASoC: Failed to get PLLB\n");
ret = PTR_ERR(mclk);
goto err_mclk;
}
ret = clk_set_parent(mclk, main);
clk_put(main);
if (ret != 0) {
printk(KERN_ERR "ASoC: Failed to set MCLK parent\n");
goto err_mclk;
}
clk_set_rate(mclk, MCLK_RATE);
/*
* Request SSC device
*/
ssc = ssc_request(1);
if (IS_ERR(ssc)) {
printk(KERN_ERR "ASoC: Failed to request SSC 1\n");
ret = PTR_ERR(ssc);
ssc = NULL;
goto err_ssc;
}
ssc_p->ssc = ssc;
at91sam9g45ek_snd_device = platform_device_alloc("soc-audio", -1);
if (!at91sam9g45ek_snd_device) {
printk(KERN_ERR "ASoC: Platform device allocation failed\n");
ret = -ENOMEM;
}
platform_set_drvdata(at91sam9g45ek_snd_device,
&at91sam9g45ek_snd_devdata);
at91sam9g45ek_snd_devdata.dev = &at91sam9g45ek_snd_device->dev;
ret = platform_device_add(at91sam9g45ek_snd_device);
if (ret) {
printk(KERN_ERR "ASoC: Platform device allocation failed\n");
platform_device_put(at91sam9g45ek_snd_device);
}
return ret;
err_ssc:
ssc_free(ssc);
ssc_p->ssc = NULL;
err_mclk:
clk_put(mclk);
mclk = NULL;
err:
return ret;
}
static void __exit at91sam9g45ek_exit(void)
{
struct atmel_ssc_info *ssc_p = at91sam9g45ek_dai.cpu_dai->private_data;
struct ssc_device *ssc;
if (ssc_p != NULL) {
ssc = ssc_p->ssc;
if (ssc != NULL)
ssc_free(ssc);
ssc_p->ssc = NULL;
}
platform_device_unregister(at91sam9g45ek_snd_device);
at91sam9g45ek_snd_device = NULL;
clk_put(mclk);
mclk = NULL;
}
module_init(at91sam9g45ek_init);
module_exit(at91sam9g45ek_exit);
/* Module information */
MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou at atmel.com>");
MODULE_DESCRIPTION("ALSA SoC AT91SAM9G45_WM8974");
MODULE_LICENSE("GPL");
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