287 lines
6.9 KiB
C
287 lines
6.9 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/of.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 "../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_set_bias_level(struct snd_soc_card *card,
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struct snd_soc_dapm_context *dapm,
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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/RHPOUT */
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{"Ext Spk", NULL, "LHPOUT"},
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{"Ext Spk", NULL, "RHPOUT"},
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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_dai *codec_dai = rtd->codec_dai;
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struct device *dev = rtd->dev;
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int ret;
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dev_dbg(dev, "%s called\n", __func__);
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ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK,
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MCLK_RATE, SND_SOC_CLOCK_IN);
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if (ret < 0) {
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dev_err(dev, "Failed to set WM8731 SYSCLK: %d\n", ret);
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return ret;
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}
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#ifndef ENABLE_MIC_INPUT
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snd_soc_dapm_nc_pin(&rtd->card->dapm, "Int Mic");
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#endif
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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 = "at91rm9200_ssc.0",
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.codec_dai_name = "wm8731-hifi",
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.init = at91sam9g20ek_wm8731_init,
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.platform_name = "at91rm9200_ssc.0",
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.codec_name = "wm8731.0-001b",
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.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
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SND_SOC_DAIFMT_CBM_CFM,
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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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.owner = THIS_MODULE,
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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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.dapm_widgets = at91sam9g20ek_dapm_widgets,
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.num_dapm_widgets = ARRAY_SIZE(at91sam9g20ek_dapm_widgets),
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.dapm_routes = intercon,
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.num_dapm_routes = ARRAY_SIZE(intercon),
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.fully_routed = true,
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};
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static int at91sam9g20ek_audio_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct device_node *codec_np, *cpu_np;
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struct clk *pllb;
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struct snd_soc_card *card = &snd_soc_at91sam9g20ek;
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int ret;
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if (!np) {
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return -ENODEV;
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}
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ret = atmel_ssc_set_audio(0);
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if (ret) {
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dev_err(&pdev->dev, "ssc channel is not valid\n");
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return -EINVAL;
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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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dev_err(&pdev->dev, "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(pllb)) {
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dev_err(&pdev->dev, "Failed to get PLLB\n");
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ret = PTR_ERR(pllb);
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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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dev_err(&pdev->dev, "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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card->dev = &pdev->dev;
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/* Parse device node info */
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ret = snd_soc_of_parse_card_name(card, "atmel,model");
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if (ret)
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goto err;
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ret = snd_soc_of_parse_audio_routing(card,
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"atmel,audio-routing");
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if (ret)
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goto err;
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/* Parse codec info */
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at91sam9g20ek_dai.codec_name = NULL;
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codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
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if (!codec_np) {
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dev_err(&pdev->dev, "codec info missing\n");
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return -EINVAL;
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}
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at91sam9g20ek_dai.codec_of_node = codec_np;
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/* Parse dai and platform info */
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at91sam9g20ek_dai.cpu_dai_name = NULL;
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at91sam9g20ek_dai.platform_name = NULL;
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cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
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if (!cpu_np) {
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dev_err(&pdev->dev, "dai and pcm info missing\n");
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return -EINVAL;
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}
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at91sam9g20ek_dai.cpu_of_node = cpu_np;
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at91sam9g20ek_dai.platform_of_node = cpu_np;
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of_node_put(codec_np);
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of_node_put(cpu_np);
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ret = snd_soc_register_card(card);
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if (ret) {
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dev_err(&pdev->dev, "snd_soc_register_card() failed\n");
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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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atmel_ssc_put_audio(0);
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return ret;
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}
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static int at91sam9g20ek_audio_remove(struct platform_device *pdev)
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{
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struct snd_soc_card *card = platform_get_drvdata(pdev);
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clk_disable(mclk);
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mclk = NULL;
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snd_soc_unregister_card(card);
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atmel_ssc_put_audio(0);
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return 0;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = {
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{ .compatible = "atmel,at91sam9g20ek-wm8731-audio", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids);
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#endif
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static struct platform_driver at91sam9g20ek_audio_driver = {
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.driver = {
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.name = "at91sam9g20ek-audio",
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.of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids),
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},
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.probe = at91sam9g20ek_audio_probe,
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.remove = at91sam9g20ek_audio_remove,
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};
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module_platform_driver(at91sam9g20ek_audio_driver);
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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_ALIAS("platform:at91sam9g20ek-audio");
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MODULE_LICENSE("GPL");
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