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+/*
+ * Copyright 2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __MACH_MXS_SAIF_H__
+#define __MACH_MXS_SAIF_H__
+
+struct mxs_audio_platform_data {
+ int sysclk;
+
+ int (*init) (void); /* board specific init */
+ int (*finit) (void); /* board specific finit */
+};
+#endif /* __MACH_MXS_SAIF_H__ */
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+/*
+ * Copyright 2011 Freescale Semiconductor, Inc.
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/fsl_devices.h>
+#include <linux/gpio.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+#include <sound/jack.h>
+#include <sound/soc-dapm.h>
+#include <asm/mach-types.h>
+
+#include <mach/audio.h>
+#include "../codecs/sgtl5000.h"
+#include "mxs-saif.h"
+
+static struct mxs_sgtl5000_priv {
+ int sysclk;
+ struct platform_device *pdev;
+} card_priv;
+
+static struct snd_soc_card mxs_sgtl5000;
+static struct platform_device *mxs_sgtl5000_snd_device;
+
+static int mxs_sgtl5000_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->codec_dai;
+ struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+ unsigned int rate = params_rate(params);
+ u32 dai_format;
+ int ret;
+
+ /* The SAIF clock should be either 512*fs or 384*fs */
+ card_priv.sysclk = 512 * rate;
+ ret = snd_soc_dai_set_sysclk(cpu_dai, MXS_SAIF_SYS_CLK,
+ card_priv.sysclk,
+ SND_SOC_CLOCK_OUT);
+ if (ret < 0)
+ return ret;
+
+ /* set SGTL5000_SYSCLK as 256*fs to support 96k sample rate */
+ snd_soc_dai_set_sysclk(codec_dai, SGTL5000_SYSCLK, 256 * rate, 0);
+
+ /* The MCLK output rate is 256*fs */
+ snd_soc_dai_set_clkdiv(cpu_dai, MXS_SAIF_MCLK, 256);
+
+ /* set codec to slave mode */
+ dai_format = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
+ SND_SOC_DAIFMT_CBS_CFS;
+
+ /* set codec DAI configuration */
+ ret = snd_soc_dai_set_fmt(codec_dai, dai_format);
+ if (ret < 0)
+ return ret;
+
+ /* set cpu DAI configuration */
+ ret = snd_soc_dai_set_fmt(cpu_dai, dai_format);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static struct snd_soc_ops mxs_sgtl5000_hifi_ops = {
+ .hw_params = mxs_sgtl5000_hw_params,
+};
+
+static int mxs_sgtl5000_soc_init(struct snd_soc_pcm_runtime *rtd)
+{
+ /* TBD: add dapm widgets */
+
+ return 0;
+}
+
+static struct snd_soc_dai_link mxs_sgtl5000_dai[] = {
+ {
+ .name = "HiFi",
+ .stream_name = "HiFi Playback",
+ .codec_dai_name = "sgtl5000",
+ .codec_name = "sgtl5000.0-000a",
+ .cpu_dai_name = "mxs-saif.0",
+ .platform_name = "mxs-pcm-audio.0",
+ .init = mxs_sgtl5000_soc_init,
+ .ops = &mxs_sgtl5000_hifi_ops,
+ },
+};
+
+static struct snd_soc_card mxs_sgtl5000 = {
+ .name = "mxs_sgtl5000",
+ .dai_link = mxs_sgtl5000_dai,
+ .num_links = ARRAY_SIZE(mxs_sgtl5000_dai),
+};
+
+static int __devinit mxs_sgtl5000_probe(struct platform_device *pdev)
+{
+ struct mxs_audio_platform_data *plat = pdev->dev.platform_data;
+ int ret;
+
+ card_priv.pdev = pdev;
+
+ ret = -EINVAL;
+ if (plat && plat->init && plat->init())
+ return ret;
+
+ return 0;
+}
+
+static int mxs_sgtl5000_remove(struct platform_device *pdev)
+{
+ struct mxs_audio_platform_data *plat = pdev->dev.platform_data;
+
+ if (plat && plat->finit)
+ plat->finit();
+
+ return 0;
+}
+
+static struct platform_driver mxs_sgtl5000_audio_driver = {
+ .probe = mxs_sgtl5000_probe,
+ .remove = mxs_sgtl5000_remove,
+ .driver = {
+ .name = "mxs-sgtl5000",
+ },
+};
+
+static int __init mxs_sgtl5000_init(void)
+{
+ int ret;
+
+ ret = platform_driver_register(&mxs_sgtl5000_audio_driver);
+ if (ret)
+ return ret;
+
+ mxs_sgtl5000_snd_device = platform_device_alloc("soc-audio", -1);
+ if (!mxs_sgtl5000_snd_device)
+ return -ENOMEM;
+
+ platform_set_drvdata(mxs_sgtl5000_snd_device, &mxs_sgtl5000);
+
+ ret = platform_device_add(mxs_sgtl5000_snd_device);
+ if (ret) {
+ printk(KERN_ERR "ASoC: Platform device allocation failed\n");
+ platform_device_put(mxs_sgtl5000_snd_device);
+ }
+
+ return ret;
+}
+
+static void __exit mxs_sgtl5000_exit(void)
+{
+ platform_driver_unregister(&mxs_sgtl5000_audio_driver);
+ platform_device_unregister(mxs_sgtl5000_snd_device);
+}
+
+late_initcall(mxs_sgtl5000_init);
+module_exit(mxs_sgtl5000_exit);
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("MXS ALSA SoC Machine driver");
+MODULE_LICENSE("GPL");
The driver only supports playback firstly. For recording, as we have to use two saif instances to implement full duplex (playback & recording) due to hardware limitation, we need to figure out a good design to fit in ASoC. Signed-off-by: Dong Aisheng <b29396@freescale.com> --- arch/arm/mach-mxs/include/mach/audio.h | 18 +++ sound/soc/mxs/mxs-sgtl5000.c | 181 ++++++++++++++++++++++++++++++++ 2 files changed, 199 insertions(+), 0 deletions(-)