ASoC: s6105 IP camera machine specific ASoC code

This patch adds machine specific code for the audio part of the Stretch
s6105 IP camera reference design.

The device uses the tlv320aic31(01) codec to generate the clock for
both I2S ports of the soc. While the master clock is generated by a
configurable PLL chip, the code assumes the factory default settings.

An additional kcontrol has been added to handle the special routing of
the board, connecting both HPLCOM and HPROUT to the same pin of the audio
jack. One of these should always be switched off.

Signed-off-by: Daniel Glöckner <dg@emlix.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/s6000/Kconfig

@@ -8,3 +8,12 @@ config SND_S6000_SOC
 
 config SND_S6000_SOC_I2S
 	tristate
+
+config SND_S6000_SOC_S6IPCAM
+	tristate "SoC Audio support for Stretch 6105 IP Camera"
+	depends on SND_S6000_SOC && XTENSA_PLATFORM_S6105
+	select SND_S6000_SOC_I2S
+	select SND_SOC_TLV320AIC3X
+	help
+	  Say Y if you want to add support for SoC audio on the
+	  Stretch s6105 IP Camera Reference Design.

sound/soc/s6000/Makefile

@@ -4,3 +4,8 @@ snd-soc-s6000-i2s-objs := s6000-i2s.o
 
 obj-$(CONFIG_SND_S6000_SOC) += snd-soc-s6000.o
 obj-$(CONFIG_SND_S6000_SOC_I2S) += snd-soc-s6000-i2s.o
+
+# s6105 Machine Support
+snd-soc-s6ipcam-objs := s6105-ipcam.o
+
+obj-$(CONFIG_SND_S6000_SOC_S6IPCAM) += snd-soc-s6ipcam.o

sound/soc/s6000/s6105-ipcam.c

@@ -0,0 +1,244 @@
+/*
+ * ASoC driver for Stretch s6105 IP camera platform
+ *
+ * Author:      Daniel Gloeckner, <dg@emlix.com>
+ * Copyright:   (C) 2009 emlix GmbH <info@emlix.com>
+ *
+ * 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/module.h>
+#include <linux/moduleparam.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+
+#include <variant/dmac.h>
+
+#include "../codecs/tlv320aic3x.h"
+#include "s6000-pcm.h"
+#include "s6000-i2s.h"
+
+#define S6105_CAM_CODEC_CLOCK 12288000
+
+static int s6105_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;
+	struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
+	int ret = 0;
+
+	/* set codec DAI configuration */
+	ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
+					     SND_SOC_DAIFMT_CBM_CFM);
+	if (ret < 0)
+		return ret;
+
+	/* set cpu DAI configuration */
+	ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_CBM_CFM |
+					   SND_SOC_DAIFMT_IB_IF);
+	if (ret < 0)
+		return ret;
+
+	/* set the codec system clock */
+	ret = snd_soc_dai_set_sysclk(codec_dai, 0, S6105_CAM_CODEC_CLOCK,
+					    SND_SOC_CLOCK_OUT);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static struct snd_soc_ops s6105_ops = {
+	.hw_params = s6105_hw_params,
+};
+
+/* s6105 machine dapm widgets */
+static const struct snd_soc_dapm_widget aic3x_dapm_widgets[] = {
+	SND_SOC_DAPM_LINE("Audio Out Differential", NULL),
+	SND_SOC_DAPM_LINE("Audio Out Stereo", NULL),
+	SND_SOC_DAPM_LINE("Audio In", NULL),
+};
+
+/* s6105 machine audio_mapnections to the codec pins */
+static const struct snd_soc_dapm_route audio_map[] = {
+	/* Audio Out connected to HPLOUT, HPLCOM, HPROUT */
+	{"Audio Out Differential", NULL, "HPLOUT"},
+	{"Audio Out Differential", NULL, "HPLCOM"},
+	{"Audio Out Stereo", NULL, "HPLOUT"},
+	{"Audio Out Stereo", NULL, "HPROUT"},
+
+	/* Audio In connected to LINE1L, LINE1R */
+	{"LINE1L", NULL, "Audio In"},
+	{"LINE1R", NULL, "Audio In"},
+};
+
+static int output_type_info(struct snd_kcontrol *kcontrol,
+			    struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
+	uinfo->count = 1;
+	uinfo->value.enumerated.items = 2;
+	if (uinfo->value.enumerated.item) {
+		uinfo->value.enumerated.item = 1;
+		strcpy(uinfo->value.enumerated.name, "HPLOUT/HPROUT");
+	} else {
+		strcpy(uinfo->value.enumerated.name, "HPLOUT/HPLCOM");
+	}
+	return 0;
+}
+
+static int output_type_get(struct snd_kcontrol *kcontrol,
+			   struct snd_ctl_elem_value *ucontrol)
+{
+	ucontrol->value.enumerated.item[0] = kcontrol->private_value;
+	return 0;
+}
+
+static int output_type_put(struct snd_kcontrol *kcontrol,
+			   struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_codec *codec = kcontrol->private_data;
+	unsigned int val = (ucontrol->value.enumerated.item[0] != 0);
+	char *differential = "Audio Out Differential";
+	char *stereo = "Audio Out Stereo";
+
+	if (kcontrol->private_value == val)
+		return 0;
+	kcontrol->private_value = val;
+	snd_soc_dapm_disable_pin(codec, val ? differential : stereo);
+	snd_soc_dapm_sync(codec);
+	snd_soc_dapm_enable_pin(codec, val ? stereo : differential);
+	snd_soc_dapm_sync(codec);
+
+	return 1;
+}
+
+static const struct snd_kcontrol_new audio_out_mux = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "Master Output Mux",
+	.index = 0,
+	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
+	.info = output_type_info,
+	.get = output_type_get,
+	.put = output_type_put,
+	.private_value = 1 /* default to stereo */
+};
+
+/* Logic for a aic3x as connected on the s6105 ip camera ref design */
+static int s6105_aic3x_init(struct snd_soc_codec *codec)
+{
+	/* Add s6105 specific widgets */
+	snd_soc_dapm_new_controls(codec, aic3x_dapm_widgets,
+				  ARRAY_SIZE(aic3x_dapm_widgets));
+
+	/* Set up s6105 specific audio path audio_map */
+	snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));
+
+	/* not present */
+	snd_soc_dapm_nc_pin(codec, "MONO_LOUT");
+	snd_soc_dapm_nc_pin(codec, "LINE2L");
+	snd_soc_dapm_nc_pin(codec, "LINE2R");
+
+	/* not connected */
+	snd_soc_dapm_nc_pin(codec, "MIC3L"); /* LINE2L on this chip */
+	snd_soc_dapm_nc_pin(codec, "MIC3R"); /* LINE2R on this chip */
+	snd_soc_dapm_nc_pin(codec, "LLOUT");
+	snd_soc_dapm_nc_pin(codec, "RLOUT");
+	snd_soc_dapm_nc_pin(codec, "HPRCOM");
+
+	/* always connected */
+	snd_soc_dapm_enable_pin(codec, "Audio In");
+
+	/* must correspond to audio_out_mux.private_value initializer */
+	snd_soc_dapm_disable_pin(codec, "Audio Out Differential");
+	snd_soc_dapm_sync(codec);
+	snd_soc_dapm_enable_pin(codec, "Audio Out Stereo");
+
+	snd_soc_dapm_sync(codec);
+
+	snd_ctl_add(codec->card, snd_ctl_new1(&audio_out_mux, codec));
+
+	return 0;
+}
+
+/* s6105 digital audio interface glue - connects codec <--> CPU */
+static struct snd_soc_dai_link s6105_dai = {
+	.name = "TLV320AIC31",
+	.stream_name = "AIC31",
+	.cpu_dai = &s6000_i2s_dai,
+	.codec_dai = &aic3x_dai,
+	.init = s6105_aic3x_init,
+	.ops = &s6105_ops,
+};
+
+/* s6105 audio machine driver */
+static struct snd_soc_card snd_soc_card_s6105 = {
+	.name = "Stretch IP Camera",
+	.platform = &s6000_soc_platform,
+	.dai_link = &s6105_dai,
+	.num_links = 1,
+};
+
+/* s6105 audio private data */
+static struct aic3x_setup_data s6105_aic3x_setup = {
+	.i2c_bus = 0,
+	.i2c_address = 0x18,
+};
+
+/* s6105 audio subsystem */
+static struct snd_soc_device s6105_snd_devdata = {
+	.card = &snd_soc_card_s6105,
+	.codec_dev = &soc_codec_dev_aic3x,
+	.codec_data = &s6105_aic3x_setup,
+};
+
+static struct s6000_snd_platform_data __initdata s6105_snd_data = {
+	.wide		= 0,
+	.channel_in	= 0,
+	.channel_out	= 1,
+	.lines_in	= 1,
+	.lines_out	= 1,
+	.same_rate	= 1,
+};
+
+static struct platform_device *s6105_snd_device;
+
+static int __init s6105_init(void)
+{
+	int ret;
+
+	s6105_snd_device = platform_device_alloc("soc-audio", -1);
+	if (!s6105_snd_device)
+		return -ENOMEM;
+
+	platform_set_drvdata(s6105_snd_device, &s6105_snd_devdata);
+	s6105_snd_devdata.dev = &s6105_snd_device->dev;
+	platform_device_add_data(s6105_snd_device, &s6105_snd_data,
+				 sizeof(s6105_snd_data));
+
+	ret = platform_device_add(s6105_snd_device);
+	if (ret)
+		platform_device_put(s6105_snd_device);
+
+	return ret;
+}
+
+static void __exit s6105_exit(void)
+{
+	platform_device_unregister(s6105_snd_device);
+}
+
+module_init(s6105_init);
+module_exit(s6105_exit);
+
+MODULE_AUTHOR("Daniel Gloeckner");
+MODULE_DESCRIPTION("Stretch s6105 IP camera ASoC driver");
+MODULE_LICENSE("GPL");