Add IQaudIO Sound Card support for Raspberry Pi

arch/arm/configs/bcmrpi_defconfig

@@ -743,6 +743,7 @@ CONFIG_SND_BCM2708_SOC_I2S=m
 CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC=m
 CONFIG_SND_BCM2708_SOC_HIFIBERRY_DIGI=m
 CONFIG_SND_BCM2708_SOC_RPI_DAC=m
+CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC=m
 CONFIG_SOUND_PRIME=m
 CONFIG_HIDRAW=y
 CONFIG_HID_A4TECH=m

arch/arm/mach-bcm2708/bcm2708.c

@@ -685,6 +685,22 @@ static struct platform_device snd_pcm1794a_codec_device = {
 };
 #endif
 
+
+#if defined(CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC) || defined(CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC_MODULE)
+static struct platform_device snd_rpi_iqaudio_dac_device = {
+        .name = "snd-rpi-iqaudio-dac",
+        .id = 0,
+        .num_resources = 0,
+};
+
+// Use the actual device name rather than generic driver name 
+static struct i2c_board_info __initdata snd_pcm512x_i2c_devices[] = {
+	{
+		I2C_BOARD_INFO("pcm5122", 0x4c)
+	},
+};
+#endif
+
 int __init bcm_register_device(struct platform_device *pdev)
 {
 	int ret;
@@ -831,6 +847,12 @@ void __init bcm2708_init(void)
         bcm_register_device(&snd_pcm1794a_codec_device);
 #endif
 
+#if defined(CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC) || defined(CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC_MODULE)
+        bcm_register_device(&snd_rpi_iqaudio_dac_device);
+        i2c_register_board_info(1, snd_pcm512x_i2c_devices, ARRAY_SIZE(snd_pcm512x_i2c_devices));
+#endif
+
+
 	for (i = 0; i < ARRAY_SIZE(amba_devs); i++) {
 		struct amba_device *d = amba_devs[i];
 		amba_device_register(d, &iomem_resource);

sound/soc/bcm/Kconfig

@@ -29,3 +29,10 @@ config SND_BCM2708_SOC_RPI_DAC
         select SND_SOC_PCM1794A
         help
          Say Y or M if you want to add support for RPi-DAC.
+
+config SND_BCM2708_SOC_IQAUDIO_DAC
+	tristate "Support for IQaudIO-DAC"
+	depends on SND_BCM2708_SOC_I2S
+	select SND_SOC_PCM512x
+	help
+	  Say Y or M if you want to add support for IQaudIO-DAC.

sound/soc/bcm/Makefile

@@ -7,7 +7,10 @@ obj-$(CONFIG_SND_BCM2708_SOC_I2S) += snd-soc-bcm2708-i2s.o
 snd-soc-hifiberry-dac-objs := hifiberry_dac.o
 snd-soc-hifiberry-digi-objs := hifiberry_digi.o
 snd-soc-rpi-dac-objs := rpi-dac.o
+snd-soc-iqaudio-dac-objs := iqaudio-dac.o
 
 obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC) += snd-soc-hifiberry-dac.o
 obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DIGI) += snd-soc-hifiberry-digi.o
 obj-$(CONFIG_SND_BCM2708_SOC_RPI_DAC) += snd-soc-rpi-dac.o
+obj-$(CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC) += snd-soc-iqaudio-dac.o
+

sound/soc/bcm/iqaudio-dac.c

@@ -0,0 +1,111 @@
+/*
+ * ASoC Driver for IQaudIO DAC
+ *
+ * Author:	Florian Meier <[email protected]>
+ *		Copyright 2013
+ *
+ * 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.
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/jack.h>
+
+static int snd_rpi_iqaudio_dac_init(struct snd_soc_pcm_runtime *rtd)
+{
+// NOT USED	struct snd_soc_codec *codec = rtd->codec;
+
+	return 0;
+}
+
+static int snd_rpi_iqaudio_dac_hw_params(struct snd_pcm_substream *substream,
+				       struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+// NOT USED	struct snd_soc_dai *codec_dai = rtd->codec_dai;
+// NOT USED	struct snd_soc_codec *codec = rtd->codec;
+	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+
+	unsigned int sample_bits =
+		snd_pcm_format_physical_width(params_format(params));
+
+	return snd_soc_dai_set_bclk_ratio(cpu_dai, sample_bits * 2);
+}
+
+/* machine stream operations */
+static struct snd_soc_ops snd_rpi_iqaudio_dac_ops = {
+	.hw_params = snd_rpi_iqaudio_dac_hw_params,
+};
+
+static struct snd_soc_dai_link snd_rpi_iqaudio_dac_dai[] = {
+{
+	.name		= "IQaudIO DAC",
+	.stream_name	= "IQaudIO DAC HiFi",
+	.cpu_dai_name	= "bcm2708-i2s.0",
+	.codec_dai_name	= "pcm512x-hifi",
+	.platform_name	= "bcm2708-i2s.0",
+	.codec_name	= "pcm512x.1-004c",
+	.dai_fmt	= SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
+				SND_SOC_DAIFMT_CBS_CFS,
+	.ops		= &snd_rpi_iqaudio_dac_ops,
+	.init		= snd_rpi_iqaudio_dac_init,
+},
+};
+
+/* audio machine driver */
+static struct snd_soc_card snd_rpi_iqaudio_dac = {
+	.name         = "snd_rpi_iqaudio_dac",
+	.dai_link     = snd_rpi_iqaudio_dac_dai,
+	.num_links    = ARRAY_SIZE(snd_rpi_iqaudio_dac_dai),
+};
+
+static int snd_rpi_iqaudio_dac_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+
+	snd_rpi_iqaudio_dac.dev = &pdev->dev;
+	ret = snd_soc_register_card(&snd_rpi_iqaudio_dac);
+	if (ret)
+		dev_err(&pdev->dev,
+			"snd_soc_register_card() failed: %d\n", ret);
+
+	return ret;
+}
+
+static int snd_rpi_iqaudio_dac_remove(struct platform_device *pdev)
+{
+	return snd_soc_unregister_card(&snd_rpi_iqaudio_dac);
+}
+
+static const struct of_device_id iqaudio_of_match[] = {
+	{ .compatible = "iqaudio,iqaudio-dac", },
+	{},
+};
+
+static struct platform_driver snd_rpi_iqaudio_dac_driver = {
+	.driver = {
+		.name   = "snd-rpi-iqaudio-dac",
+		.owner  = THIS_MODULE,
+		.of_match_table = iqaudio_of_match,
+	},
+	.probe          = snd_rpi_iqaudio_dac_probe,
+	.remove         = snd_rpi_iqaudio_dac_remove,
+};
+
+module_platform_driver(snd_rpi_iqaudio_dac_driver);
+
+MODULE_AUTHOR("Florian Meier <[email protected]>");
+MODULE_DESCRIPTION("ASoC Driver for IQAudio DAC");
+MODULE_LICENSE("GPL v2");

sound/soc/codecs/Kconfig

@@ -57,6 +57,7 @@ config SND_SOC_ALL_CODECS
 	select SND_SOC_PCM3008
 	select SND_SOC_PCM1794A
 	select SND_SOC_PCM5102A
+	select SND_SOC_PCM512x if SND_SOC_I2C_AND_SPI
 	select SND_SOC_RT5631 if I2C
 	select SND_SOC_SGTL5000 if I2C
 	select SND_SOC_SI476X if MFD_SI476X_CORE
@@ -301,6 +302,9 @@ config SND_SOC_PCM1794A
 config SND_SOC_PCM5102A
 	tristate
 
+config SND_SOC_PCM512x
+       tristate
+
 config SND_SOC_RT5631
 	tristate
 

sound/soc/codecs/Makefile

@@ -45,6 +45,7 @@ snd-soc-omap-hdmi-codec-objs := omap-hdmi.o
 snd-soc-pcm3008-objs := pcm3008.o
 snd-soc-pcm1794a-objs := pcm1794a.o
 snd-soc-pcm5102a-objs := pcm5102a.o
+snd-soc-pcm512x-objs := pcm512x.o
 snd-soc-rt5631-objs := rt5631.o
 snd-soc-sgtl5000-objs := sgtl5000.o
 snd-soc-alc5623-objs := alc5623.o
@@ -174,6 +175,7 @@ obj-$(CONFIG_SND_SOC_OMAP_HDMI_CODEC) += snd-soc-omap-hdmi-codec.o
 obj-$(CONFIG_SND_SOC_PCM3008)	+= snd-soc-pcm3008.o
 obj-$(CONFIG_SND_SOC_PCM1794A)	+= snd-soc-pcm1794a.o
 obj-$(CONFIG_SND_SOC_PCM5102A)	+= snd-soc-pcm5102a.o
+obj-$(CONFIG_SND_SOC_PCM512x)	+= snd-soc-pcm512x.o
 obj-$(CONFIG_SND_SOC_RT5631)	+= snd-soc-rt5631.o
 obj-$(CONFIG_SND_SOC_SGTL5000)  += snd-soc-sgtl5000.o
 obj-$(CONFIG_SND_SOC_SIGMADSP)	+= snd-soc-sigmadsp.o