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875065491f
One of the issues with the ASoC v1 API which has been addressed in the ASoC v2 work that Liam Girdwood has done is that the ALSA card provided by ASoC is distributed around the ASoC structures. For example, machine wide data such as the struct snd_card are maintained as part of the CODEC data structure, preventing the use of multiple codecs. This has been addressed by refactoring the data structures so that all the data for the ALSA card is contained in a single structure snd_soc_card which replaces the existing snd_soc_machine and snd_soc_device. Begin the process of backporting this by renaming struct snd_soc_machine to struct snd_soc_card, better reflecting its function and bringing it closer to standard ALSA terminology. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
328 lines
8.8 KiB
C
328 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_disable_pin(codec, "RLINEIN");
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snd_soc_dapm_disable_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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.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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.platform = &atmel_soc_platform,
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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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