|
@@ -0,0 +1,142 @@
|
|
|
+/*
|
|
|
+ * 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 <sound/core.h>
|
|
|
+#include <sound/pcm.h>
|
|
|
+#include <sound/soc.h>
|
|
|
+#include <asm/mach-types.h>
|
|
|
+#include <mach/hardware.h>
|
|
|
+#include "ep93xx-pcm.h"
|
|
|
+
|
|
|
+#define edb93xx_has_audio() (machine_is_edb9301() || \
|
|
|
+ machine_is_edb9302() || \
|
|
|
+ machine_is_edb9302a() || \
|
|
|
+ machine_is_edb9307a() || \
|
|
|
+ machine_is_edb9315a())
|
|
|
+
|
|
|
+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 rate = params_rate(params);
|
|
|
+ /*
|
|
|
+ * We set LRCLK equal to `rate' and SCLK = LRCLK * 64,
|
|
|
+ * because our sample size is 32 bit * 2 channels.
|
|
|
+ * I2S standard permits us to transmit more bits than
|
|
|
+ * the codec uses.
|
|
|
+ * MCLK = SCLK * 4 is the best recommended value,
|
|
|
+ * but we have to fall back to ratio 2 for higher
|
|
|
+ * sample rates.
|
|
|
+ */
|
|
|
+ unsigned int mclk_rate = rate * 64 * ((rate <= 48000) ? 4 : 2);
|
|
|
+
|
|
|
+ err = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
|
|
|
+ SND_SOC_DAIFMT_NB_IF |
|
|
|
+ SND_SOC_DAIFMT_CBS_CFS);
|
|
|
+ if (err)
|
|
|
+ return err;
|
|
|
+
|
|
|
+ err = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
|
|
|
+ SND_SOC_DAIFMT_NB_IF |
|
|
|
+ SND_SOC_DAIFMT_CBS_CFS);
|
|
|
+ if (err)
|
|
|
+ return err;
|
|
|
+
|
|
|
+ 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-pcm-audio",
|
|
|
+ .cpu_dai_name = "ep93xx-i2s",
|
|
|
+ .codec_name = "spi0.0",
|
|
|
+ .codec_dai_name = "cs4271-hifi",
|
|
|
+ .ops = &edb93xx_ops,
|
|
|
+};
|
|
|
+
|
|
|
+static struct snd_soc_card snd_soc_edb93xx = {
|
|
|
+ .name = "EDB93XX",
|
|
|
+ .dai_link = &edb93xx_dai,
|
|
|
+ .num_links = 1,
|
|
|
+};
|
|
|
+
|
|
|
+static struct platform_device *edb93xx_snd_device;
|
|
|
+
|
|
|
+static int __init edb93xx_init(void)
|
|
|
+{
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ if (!edb93xx_has_audio())
|
|
|
+ return -ENODEV;
|
|
|
+
|
|
|
+ ret = ep93xx_i2s_acquire(EP93XX_SYSCON_DEVCFG_I2SONAC97,
|
|
|
+ EP93XX_SYSCON_I2SCLKDIV_ORIDE |
|
|
|
+ EP93XX_SYSCON_I2SCLKDIV_SPOL);
|
|
|
+ if (ret)
|
|
|
+ return ret;
|
|
|
+
|
|
|
+ edb93xx_snd_device = platform_device_alloc("soc-audio", -1);
|
|
|
+ if (!edb93xx_snd_device) {
|
|
|
+ ret = -ENOMEM;
|
|
|
+ goto free_i2s;
|
|
|
+ }
|
|
|
+
|
|
|
+ platform_set_drvdata(edb93xx_snd_device, &snd_soc_edb93xx);
|
|
|
+ ret = platform_device_add(edb93xx_snd_device);
|
|
|
+ if (ret)
|
|
|
+ goto device_put;
|
|
|
+
|
|
|
+ return 0;
|
|
|
+
|
|
|
+device_put:
|
|
|
+ platform_device_put(edb93xx_snd_device);
|
|
|
+free_i2s:
|
|
|
+ ep93xx_i2s_release();
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+module_init(edb93xx_init);
|
|
|
+
|
|
|
+static void __exit edb93xx_exit(void)
|
|
|
+{
|
|
|
+ platform_device_unregister(edb93xx_snd_device);
|
|
|
+ ep93xx_i2s_release();
|
|
|
+}
|
|
|
+module_exit(edb93xx_exit);
|
|
|
+
|
|
|
+MODULE_AUTHOR("Alexander Sverdlin <subaparts@yandex.ru>");
|
|
|
+MODULE_DESCRIPTION("ALSA SoC EDB93xx");
|
|
|
+MODULE_LICENSE("GPL");
|