Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / sound / soc / cirrus / edb93xx.c

diff --git a/kernel/sound/soc/cirrus/edb93xx.c b/kernel/sound/soc/cirrus/edb93xx.c
new file mode 100644 (file)
index 0000000..8596265
--- /dev/null
+++ b/kernel/sound/soc/cirrus/edb93xx.c
@@ -0,0 +1,126 @@
+/*
+ * SoC audio for EDB93xx
+ *
+ * Copyright (c) 2010 Alexander Sverdlin <subaparts@yandex.ru>
+ *
+ * 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.
+ *
+ * This driver support CS4271 codec being master or slave, working
+ * in control port mode, connected either via SPI or I2C.
+ * The data format accepted is I2S or left-justified.
+ * DAPM support not implemented.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/module.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+#include <asm/mach-types.h>
+#include <mach/hardware.h>
+
+static int edb93xx_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;
+       int err;
+       unsigned int mclk_rate;
+       unsigned int rate = params_rate(params);
+
+       /*
+        * According to CS4271 datasheet we use MCLK/LRCK=256 for
+        * rates below 50kHz and 128 for higher sample rates
+        */
+       if (rate < 50000)
+               mclk_rate = rate * 64 * 4;
+       else
+               mclk_rate = rate * 64 * 2;
+
+       err = snd_soc_dai_set_sysclk(codec_dai, 0, mclk_rate,
+                                    SND_SOC_CLOCK_IN);
+       if (err)
+               return err;
+
+       return snd_soc_dai_set_sysclk(cpu_dai, 0, mclk_rate,
+                                     SND_SOC_CLOCK_OUT);
+}
+
+static struct snd_soc_ops edb93xx_ops = {
+       .hw_params      = edb93xx_hw_params,
+};
+
+static struct snd_soc_dai_link edb93xx_dai = {
+       .name           = "CS4271",
+       .stream_name    = "CS4271 HiFi",
+       .platform_name  = "ep93xx-i2s",
+       .cpu_dai_name   = "ep93xx-i2s",
+       .codec_name     = "spi0.0",
+       .codec_dai_name = "cs4271-hifi",
+       .dai_fmt        = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_IF |
+                         SND_SOC_DAIFMT_CBS_CFS,
+       .ops            = &edb93xx_ops,
+};
+
+static struct snd_soc_card snd_soc_edb93xx = {
+       .name           = "EDB93XX",
+       .owner          = THIS_MODULE,
+       .dai_link       = &edb93xx_dai,
+       .num_links      = 1,
+};
+
+static int edb93xx_probe(struct platform_device *pdev)
+{
+       struct snd_soc_card *card = &snd_soc_edb93xx;
+       int ret;
+
+       ret = ep93xx_i2s_acquire();
+       if (ret)
+               return ret;
+
+       card->dev = &pdev->dev;
+
+       ret = snd_soc_register_card(card);
+       if (ret) {
+               dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
+                       ret);
+               ep93xx_i2s_release();
+       }
+
+       return ret;
+}
+
+static int edb93xx_remove(struct platform_device *pdev)
+{
+       struct snd_soc_card *card = platform_get_drvdata(pdev);
+
+       snd_soc_unregister_card(card);
+       ep93xx_i2s_release();
+
+       return 0;
+}
+
+static struct platform_driver edb93xx_driver = {
+       .driver         = {
+               .name   = "edb93xx-audio",
+       },
+       .probe          = edb93xx_probe,
+       .remove         = edb93xx_remove,
+};
+
+module_platform_driver(edb93xx_driver);
+
+MODULE_AUTHOR("Alexander Sverdlin <subaparts@yandex.ru>");
+MODULE_DESCRIPTION("ALSA SoC EDB93xx");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:edb93xx-audio");