ASoC: mxs: add mxs-sgtl5000 machine driver

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>
Acked-by: Liam Girdwood <lrg@ti.com>
Tested-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 165 insertions, 0 deletions

diff --git a/sound/soc/mxs/mxs-sgtl5000.c b/sound/soc/mxs/mxs-sgtl5000.c
new file mode 100644
index 000000000000..a0d89c93df0f
--- /dev/null
+++ b/sound/soc/mxs/mxs-sgtl5000.c
@@ -0,0 +1,165 @@
+/*
+ * 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/device.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 "../codecs/sgtl5000.h"
+#include "mxs-saif.h"
+
+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, mclk;
+        int ret;
+
+        /* sgtl5000 does not support 512*rate when in 96000 fs */
+        switch (rate) {
+        case 96000:
+                mclk = 256 * rate;
+                break;
+        default:
+                mclk = 512 * rate;
+                break;
+        }
+
+        /* Sgtl5000 sysclk should be >= 8MHz and <= 27M */
+        if (mclk < 8000000 || mclk > 27000000)
+                return -EINVAL;
+
+        /* Set SGTL5000's SYSCLK (provided by SAIF MCLK) */
+        ret = snd_soc_dai_set_sysclk(codec_dai, SGTL5000_SYSCLK, mclk, 0);
+        if (ret)
+                return ret;
+
+        /* The SAIF MCLK should be the same as SGTL5000_SYSCLK */
+        ret = snd_soc_dai_set_sysclk(cpu_dai, MXS_SAIF_MCLK, mclk, 0);
+        if (ret)
+                return ret;
+
+        /* 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)
+                return ret;
+
+        /* set cpu DAI configuration */
+        ret = snd_soc_dai_set_fmt(cpu_dai, dai_format);
+        if (ret)
+                return ret;
+
+        return 0;
+}
+
+static struct snd_soc_ops mxs_sgtl5000_hifi_ops = {
+        .hw_params = mxs_sgtl5000_hw_params,
+};
+
+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",
+                .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 snd_soc_card *card = &mxs_sgtl5000;
+        int ret;
+
+        /*
+         * Set an init clock(11.28Mhz) for sgtl5000 initialization(i2c r/w).
+         * The Sgtl5000 sysclk is derived from saif0 mclk and it's range
+         * should be >= 8MHz and <= 27M.
+         */
+        ret = mxs_saif_get_mclk(0, 44100 * 256, 44100);
+        if (ret)
+                return ret;
+
+        card->dev = &pdev->dev;
+        platform_set_drvdata(pdev, card);
+
+        ret = snd_soc_register_card(card);
+        if (ret) {
+                dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n",
+                        ret);
+                return ret;
+        }
+
+        return 0;
+}
+
+static int __devexit mxs_sgtl5000_remove(struct platform_device *pdev)
+{
+        struct snd_soc_card *card = platform_get_drvdata(pdev);
+
+        mxs_saif_put_mclk(0);
+
+        snd_soc_unregister_card(card);
+
+        return 0;
+}
+
+static struct platform_driver mxs_sgtl5000_audio_driver = {
+        .driver = {
+                .name = "mxs-sgtl5000",
+                .owner = THIS_MODULE,
+        },
+        .probe = mxs_sgtl5000_probe,
+        .remove = __devexit_p(mxs_sgtl5000_remove),
+};
+
+static int __init mxs_sgtl5000_init(void)
+{
+        return platform_driver_register(&mxs_sgtl5000_audio_driver);
+}
+module_init(mxs_sgtl5000_init);
+
+static void __exit mxs_sgtl5000_exit(void)
+{
+        platform_driver_unregister(&mxs_sgtl5000_audio_driver);
+}
+module_exit(mxs_sgtl5000_exit);
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("MXS ALSA SoC Machine driver");
+MODULE_LICENSE("GPL");