329 lines
8.8 KiB
C
329 lines
8.8 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/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 <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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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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/* codec system clock is supplied by PCK0, set to 12MHz */
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ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK,
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12000000, SND_SOC_CLOCK_IN);
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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 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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struct atmel_ssc_info *ssc_p = cpu_dai->private_data;
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struct ssc_device *ssc = ssc_p->ssc;
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int ret;
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unsigned int rate;
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int cmr_div, period;
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if (ssc == NULL) {
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printk(KERN_INFO "at91sam9g20ek_hw_params: ssc is NULL!\n");
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return -EINVAL;
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}
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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_CBS_CFS);
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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_CBS_CFS);
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if (ret < 0)
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return ret;
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/*
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* The SSC clock dividers depend on the sample rate. The CMR.DIV
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* field divides the system master clock MCK to drive the SSC TK
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* signal which provides the codec BCLK. The TCMR.PERIOD and
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* RCMR.PERIOD fields further divide the BCLK signal to drive
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* the SSC TF and RF signals which provide the codec DACLRC and
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* ADCLRC clocks.
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*
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* The dividers were determined through trial and error, where a
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* CMR.DIV value is chosen such that the resulting BCLK value is
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* divisible, or almost divisible, by (2 * sample rate), and then
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* the TCMR.PERIOD or RCMR.PERIOD is BCLK / (2 * sample rate) - 1.
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*/
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rate = params_rate(params);
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switch (rate) {
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case 8000:
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cmr_div = 55; /* BCLK = 133MHz/(2*55) = 1.209MHz */
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period = 74; /* LRC = BCLK/(2*(74+1)) ~= 8060,6Hz */
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break;
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case 11025:
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cmr_div = 67; /* BCLK = 133MHz/(2*60) = 1.108MHz */
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period = 45; /* LRC = BCLK/(2*(49+1)) = 11083,3Hz */
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break;
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case 16000:
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cmr_div = 63; /* BCLK = 133MHz/(2*63) = 1.055MHz */
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period = 32; /* LRC = BCLK/(2*(32+1)) = 15993,2Hz */
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break;
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case 22050:
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cmr_div = 52; /* BCLK = 133MHz/(2*52) = 1.278MHz */
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period = 28; /* LRC = BCLK/(2*(28+1)) = 22049Hz */
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break;
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case 32000:
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cmr_div = 66; /* BCLK = 133MHz/(2*66) = 1.007MHz */
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period = 15; /* LRC = BCLK/(2*(15+1)) = 31486,742Hz */
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break;
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case 44100:
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cmr_div = 29; /* BCLK = 133MHz/(2*29) = 2.293MHz */
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period = 25; /* LRC = BCLK/(2*(25+1)) = 44098Hz */
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break;
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case 48000:
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cmr_div = 33; /* BCLK = 133MHz/(2*33) = 2.015MHz */
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period = 20; /* LRC = BCLK/(2*(20+1)) = 47979,79Hz */
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break;
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case 88200:
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cmr_div = 29; /* BCLK = 133MHz/(2*29) = 2.293MHz */
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period = 12; /* LRC = BCLK/(2*(12+1)) = 88196Hz */
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break;
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case 96000:
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cmr_div = 23; /* BCLK = 133MHz/(2*23) = 2.891MHz */
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period = 14; /* LRC = BCLK/(2*(14+1)) = 96376Hz */
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break;
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default:
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printk(KERN_WARNING "unsupported rate %d"
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" on at91sam9g20ek board\n", rate);
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return -EINVAL;
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}
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/* set the MCK divider for BCLK */
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ret = snd_soc_dai_set_clkdiv(cpu_dai, ATMEL_SSC_CMR_DIV, cmr_div);
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if (ret < 0)
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return ret;
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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/* set the BCLK divider for DACLRC */
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ret = snd_soc_dai_set_clkdiv(cpu_dai,
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ATMEL_SSC_TCMR_PERIOD, period);
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} else {
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/* set the BCLK divider for ADCLRC */
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ret = snd_soc_dai_set_clkdiv(cpu_dai,
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ATMEL_SSC_RCMR_PERIOD, period);
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}
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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 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 = "WM8731",
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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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};
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static struct wm8731_setup_data at91sam9g20ek_wm8731_setup = {
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.i2c_bus = 0,
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.i2c_address = 0x1b,
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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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.codec_data = &at91sam9g20ek_wm8731_setup,
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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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int ret;
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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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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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at91sam9g20ek_snd_device = platform_device_alloc("soc-audio", -1);
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if (!at91sam9g20ek_snd_device) {
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printk(KERN_DEBUG
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"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_DEBUG
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"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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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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}
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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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