--- /dev/null
+/*
+ * ALSA SoC driver for Migo-R
+ *
+ * Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
+ *
+ * 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.
+ */
+
+#include <linux/device.h>
+#include <linux/firmware.h>
+#include <linux/module.h>
+
+#include <asm/clock.h>
+
+#include <cpu/sh7722.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+
+#include "../codecs/wm8978.h"
+#include "siu.h"
+
+/* Default 8000Hz sampling frequency */
+static unsigned long codec_freq = 8000 * 512;
+
+static unsigned int use_count;
+
+/* External clock, sourced from the codec at the SIUMCKB pin */
+static unsigned long siumckb_recalc(struct clk *clk)
+{
+ return codec_freq;
+}
+
+static struct clk_ops siumckb_clk_ops = {
+ .recalc = siumckb_recalc,
+};
+
+static struct clk siumckb_clk = {
+ .name = "siumckb_clk",
+ .id = -1,
+ .ops = &siumckb_clk_ops,
+ .rate = 0, /* initialised at run-time */
+};
+
+static int migor_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->dai->codec_dai;
+ int ret;
+ unsigned int rate = params_rate(params);
+
+ ret = snd_soc_dai_set_sysclk(codec_dai, WM8978_PLL, 13000000,
+ SND_SOC_CLOCK_IN);
+ if (ret < 0)
+ return ret;
+
+ ret = snd_soc_dai_set_clkdiv(codec_dai, WM8978_DACCLK, 8);
+ if (ret < 0)
+ return ret;
+
+ ret = snd_soc_dai_set_clkdiv(codec_dai, WM8978_OPCLKRATE, rate * 512);
+ if (ret < 0)
+ return ret;
+
+ ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_NB_IF |
+ SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS);
+ if (ret < 0)
+ return ret;
+
+ ret = snd_soc_dai_set_fmt(rtd->dai->cpu_dai, SND_SOC_DAIFMT_NB_IF |
+ SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS);
+ if (ret < 0)
+ return ret;
+
+ codec_freq = rate * 512;
+ /*
+ * This propagates the parent frequency change to children and
+ * recalculates the frequency table
+ */
+ clk_set_rate(&siumckb_clk, codec_freq);
+ dev_dbg(codec_dai->dev, "%s: configure %luHz\n", __func__, codec_freq);
+
+ ret = snd_soc_dai_set_sysclk(rtd->dai->cpu_dai, SIU_CLKB_EXT,
+ codec_freq / 2, SND_SOC_CLOCK_IN);
+
+ if (!ret)
+ use_count++;
+
+ return ret;
+}
+
+static int migor_hw_free(struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
+
+ if (use_count) {
+ use_count--;
+
+ if (!use_count)
+ snd_soc_dai_set_sysclk(codec_dai, WM8978_PLL, 0,
+ SND_SOC_CLOCK_IN);
+ } else {
+ dev_dbg(codec_dai->dev, "Unbalanced hw_free!\n");
+ }
+
+ return 0;
+}
+
+static struct snd_soc_ops migor_dai_ops = {
+ .hw_params = migor_hw_params,
+ .hw_free = migor_hw_free,
+};
+
+static const struct snd_soc_dapm_widget migor_dapm_widgets[] = {
+ SND_SOC_DAPM_HP("Headphone", NULL),
+ SND_SOC_DAPM_MIC("Onboard Microphone", NULL),
+ SND_SOC_DAPM_MIC("External Microphone", NULL),
+};
+
+static const struct snd_soc_dapm_route audio_map[] = {
+ /* Headphone output connected to LHP/RHP, enable OUT4 for VMID */
+ { "Headphone", NULL, "OUT4 VMID" },
+ { "OUT4 VMID", NULL, "LHP" },
+ { "OUT4 VMID", NULL, "RHP" },
+
+ /* On-board microphone */
+ { "RMICN", NULL, "Mic Bias" },
+ { "RMICP", NULL, "Mic Bias" },
+ { "Mic Bias", NULL, "Onboard Microphone" },
+
+ /* External microphone */
+ { "LMICN", NULL, "Mic Bias" },
+ { "LMICP", NULL, "Mic Bias" },
+ { "Mic Bias", NULL, "External Microphone" },
+};
+
+static int migor_dai_init(struct snd_soc_codec *codec)
+{
+ snd_soc_dapm_new_controls(codec, migor_dapm_widgets,
+ ARRAY_SIZE(migor_dapm_widgets));
+
+ snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));
+
+ return 0;
+}
+
+/* migor digital audio interface glue - connects codec <--> CPU */
+static struct snd_soc_dai_link migor_dai = {
+ .name = "wm8978",
+ .stream_name = "WM8978",
+ .cpu_dai = &siu_i2s_dai,
+ .codec_dai = &wm8978_dai,
+ .ops = &migor_dai_ops,
+ .init = migor_dai_init,
+};
+
+/* migor audio machine driver */
+static struct snd_soc_card snd_soc_migor = {
+ .name = "Migo-R",
+ .platform = &siu_platform,
+ .dai_link = &migor_dai,
+ .num_links = 1,
+};
+
+/* migor audio subsystem */
+static struct snd_soc_device migor_snd_devdata = {
+ .card = &snd_soc_migor,
+ .codec_dev = &soc_codec_dev_wm8978,
+};
+
+static struct platform_device *migor_snd_device;
+
+static int __init migor_init(void)
+{
+ int ret;
+
+ ret = clk_register(&siumckb_clk);
+ if (ret < 0)
+ return ret;
+
+ /* Port number used on this machine: port B */
+ migor_snd_device = platform_device_alloc("soc-audio", 1);
+ if (!migor_snd_device) {
+ ret = -ENOMEM;
+ goto epdevalloc;
+ }
+
+ platform_set_drvdata(migor_snd_device, &migor_snd_devdata);
+
+ migor_snd_devdata.dev = &migor_snd_device->dev;
+
+ ret = platform_device_add(migor_snd_device);
+ if (ret)
+ goto epdevadd;
+
+ return 0;
+
+epdevadd:
+ platform_device_put(migor_snd_device);
+epdevalloc:
+ clk_unregister(&siumckb_clk);
+ return ret;
+}
+
+static void __exit migor_exit(void)
+{
+ clk_unregister(&siumckb_clk);
+ platform_device_unregister(migor_snd_device);
+}
+
+module_init(migor_init);
+module_exit(migor_exit);
+
+MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
+MODULE_DESCRIPTION("ALSA SoC Migor");
+MODULE_LICENSE("GPL v2");
projects / karo-tx-linux.git / commitdiff