ASoC: Add SmartQ sound driver

This adds sound support for the SmartQ board.

The hardware consists of a S3C6410 coupled with a WM8987 over I²S. The WM8750
driver is used for driving the WM8987, as they are register compatible.
Signed-off-by: Maurus Cuelenaere <mcuelenaere@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/s3c24xx/Kconfig

@@ -125,3 +125,9 @@ config SND_SOC_SMDK_WM9713
 	select SND_S3C_SOC_AC97
 	help
 	  Sat Y if you want to add support for SoC audio on the SMDK.
+
+config SND_S3C64XX_SOC_SMARTQ
+	tristate "SoC I2S Audio support for SmartQ board"
+	depends on SND_S3C24XX_SOC && MACH_SMARTQ
+	select SND_S3C64XX_SOC_I2S
+	select SND_SOC_WM8750

sound/soc/s3c24xx/Makefile

@@ -29,6 +29,7 @@ snd-soc-s3c24xx-simtec-hermes-objs := s3c24xx_simtec_hermes.o
 snd-soc-s3c24xx-simtec-tlv320aic23-objs := s3c24xx_simtec_tlv320aic23.o
 snd-soc-smdk64xx-wm8580-objs := smdk64xx_wm8580.o
 snd-soc-smdk-wm9713-objs := smdk_wm9713.o
+snd-soc-s3c64xx-smartq-wm8987-objs := smartq_wm8987.o
 
 obj-$(CONFIG_SND_S3C24XX_SOC_JIVE_WM8750) += snd-soc-jive-wm8750.o
 obj-$(CONFIG_SND_S3C24XX_SOC_NEO1973_WM8753) += snd-soc-neo1973-wm8753.o
@@ -41,3 +42,4 @@ obj-$(CONFIG_SND_S3C24XX_SOC_SIMTEC_HERMES) += snd-soc-s3c24xx-simtec-hermes.o
 obj-$(CONFIG_SND_S3C24XX_SOC_SIMTEC_TLV320AIC23) += snd-soc-s3c24xx-simtec-tlv320aic23.o
 obj-$(CONFIG_SND_S3C64XX_SOC_WM8580) += snd-soc-smdk64xx-wm8580.o
 obj-$(CONFIG_SND_SOC_SMDK_WM9713) += snd-soc-smdk-wm9713.o
+obj-$(CONFIG_SND_S3C64XX_SOC_SMARTQ) += snd-soc-s3c64xx-smartq-wm8987.o

sound/soc/s3c24xx/smartq_wm8987.c

+/* sound/soc/s3c24xx/smartq_wm8987.c
+ *
+ * Copyright 2010 Maurus Cuelenaere <mcuelenaere@gmail.com>
+ *
+ * Based on smdk6410_wm8987.c
+ *     Copyright 2007 Wolfson Microelectronics PLC. - linux@wolfsonmicro.com
+ *     Graeme Gregory - graeme.gregory@wolfsonmicro.com
+ *
+ *  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.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc-dapm.h>
+#include <sound/jack.h>
+
+#include <asm/mach-types.h>
+
+#include "s3c-dma.h"
+#include "s3c64xx-i2s.h"
+
+#include "../codecs/wm8750.h"
+
+/*
+ * WM8987 is register compatible with WM8750, so using that as base driver.
+ */
+
+static struct snd_soc_card snd_soc_smartq;
+
+static int smartq_hifi_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;
+	struct s3c_i2sv2_rate_calc div;
+	unsigned int clk = 0;
+	int ret;
+
+	s3c_i2sv2_iis_calc_rate(&div, NULL, params_rate(params),
+				s3c_i2sv2_get_clock(cpu_dai));
+
+	switch (params_rate(params)) {
+	case 8000:
+	case 16000:
+	case 32000:
+	case 48000:
+	case 96000:
+		clk = 12288000;
+		break;
+	case 11025:
+	case 22050:
+	case 44100:
+	case 88200:
+		clk = 11289600;
+		break;
+	}
+
+	/* set codec DAI configuration */
+	ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
+					     SND_SOC_DAIFMT_NB_NF |
+					     SND_SOC_DAIFMT_CBS_CFS);
+	if (ret < 0)
+		return ret;
+
+	/* set cpu DAI configuration */
+	ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
+					   SND_SOC_DAIFMT_NB_NF |
+					   SND_SOC_DAIFMT_CBS_CFS);
+	if (ret < 0)
+		return ret;
+
+	/* set the codec system clock for DAC and ADC */
+	ret = snd_soc_dai_set_sysclk(codec_dai, WM8750_SYSCLK, clk,
+				     SND_SOC_CLOCK_IN);
+	if (ret < 0)
+		return ret;
+
+	/* set MCLK division for sample rate */
+	ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C_I2SV2_DIV_RCLK, div.fs_div);
+	if (ret < 0)
+		return ret;
+
+	/* set prescaler division for sample rate */
+	ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C_I2SV2_DIV_PRESCALER,
+				     div.clk_div - 1);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+/*
+ * SmartQ WM8987 HiFi DAI operations.
+ */
+static struct snd_soc_ops smartq_hifi_ops = {
+	.hw_params = smartq_hifi_hw_params,
+};
+
+static struct snd_soc_jack smartq_jack;
+
+static struct snd_soc_jack_pin smartq_jack_pins[] = {
+	/* Disable speaker when headphone is plugged in */
+	{
+		.pin	= "Internal Speaker",
+		.mask	= SND_JACK_HEADPHONE,
+		.invert	= true,
+	},
+};
+
+static struct snd_soc_jack_gpio smartq_jack_gpios[] = {
+	{
+		.gpio		= S3C64XX_GPL(12),
+		.name		= "headphone detect",
+		.report		= SND_JACK_HEADPHONE,
+		.debounce_time	= 200,
+	},
+};
+
+static const struct snd_kcontrol_new wm8987_smartq_controls[] = {
+	SOC_DAPM_PIN_SWITCH("Internal Speaker"),
+	SOC_DAPM_PIN_SWITCH("Headphone Jack"),
+	SOC_DAPM_PIN_SWITCH("Internal Mic"),
+};
+
+static int smartq_speaker_event(struct snd_soc_dapm_widget *w,
+				struct snd_kcontrol *k,
+				int event)
+{
+	gpio_set_value(S3C64XX_GPK(12), SND_SOC_DAPM_EVENT_OFF(event));
+
+	return 0;
+}
+
+static const struct snd_soc_dapm_widget wm8987_dapm_widgets[] = {
+	SND_SOC_DAPM_SPK("Internal Speaker", smartq_speaker_event),
+	SND_SOC_DAPM_HP("Headphone Jack", NULL),
+	SND_SOC_DAPM_MIC("Internal Mic", NULL),
+};
+
+static const struct snd_soc_dapm_route audio_map[] = {
+	{"Headphone Jack", NULL, "LOUT2"},
+	{"Headphone Jack", NULL, "ROUT2"},
+
+	{"Internal Speaker", NULL, "LOUT2"},
+	{"Internal Speaker", NULL, "ROUT2"},
+
+	{"Mic Bias", NULL, "Internal Mic"},
+	{"LINPUT2", NULL, "Mic Bias"},
+};
+
+static int smartq_wm8987_init(struct snd_soc_codec *codec)
+{
+	int err = 0;
+
+	/* Add SmartQ specific widgets */
+	snd_soc_dapm_new_controls(codec, wm8987_dapm_widgets,
+				  ARRAY_SIZE(wm8987_dapm_widgets));
+
+	/* add SmartQ specific controls */
+	err = snd_soc_add_controls(codec, wm8987_smartq_controls,
+				   ARRAY_SIZE(wm8987_smartq_controls));
+
+	if (err < 0)
+		return err;
+
+	/* setup SmartQ specific audio path */
+	snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));
+
+	/* set endpoints to not connected */
+	snd_soc_dapm_nc_pin(codec, "LINPUT1");
+	snd_soc_dapm_nc_pin(codec, "RINPUT1");
+	snd_soc_dapm_nc_pin(codec, "OUT3");
+	snd_soc_dapm_nc_pin(codec, "ROUT1");
+
+	/* set endpoints to default off mode */
+	snd_soc_dapm_enable_pin(codec, "Internal Speaker");
+	snd_soc_dapm_enable_pin(codec, "Internal Mic");
+	snd_soc_dapm_disable_pin(codec, "Headphone Jack");
+
+	err = snd_soc_dapm_sync(codec);
+	if (err)
+		return err;
+
+	/* Headphone jack detection */
+	err = snd_soc_jack_new(&snd_soc_smartq, "Headphone Jack",
+			       SND_JACK_HEADPHONE, &smartq_jack);
+	if (err)
+		return err;
+
+	err = snd_soc_jack_add_pins(&smartq_jack, ARRAY_SIZE(smartq_jack_pins),
+				    smartq_jack_pins);
+	if (err)
+		return err;
+
+	err = snd_soc_jack_add_gpios(&smartq_jack,
+				     ARRAY_SIZE(smartq_jack_gpios),
+				     smartq_jack_gpios);
+
+	return err;
+}
+
+static struct snd_soc_dai_link smartq_dai[] = {
+	{
+		.name		= "wm8987",
+		.stream_name	= "SmartQ Hi-Fi",
+		.cpu_dai	= &s3c64xx_i2s_dai[0],
+		.codec_dai	= &wm8750_dai,
+		.init		= smartq_wm8987_init,
+		.ops		= &smartq_hifi_ops,
+	},
+};
+
+static struct snd_soc_card snd_soc_smartq = {
+	.name = "SmartQ",
+	.platform = &s3c24xx_soc_platform,
+	.dai_link = smartq_dai,
+	.num_links = ARRAY_SIZE(smartq_dai),
+};
+
+static struct snd_soc_device smartq_snd_devdata = {
+	.card = &snd_soc_smartq,
+	.codec_dev = &soc_codec_dev_wm8750,
+};
+
+static struct platform_device *smartq_snd_device;
+
+static int __init smartq_init(void)
+{
+	int ret;
+
+	if (!machine_is_smartq7() && !machine_is_smartq5()) {
+		pr_info("Only SmartQ is supported by this ASoC driver\n");
+		return -ENODEV;
+	}
+
+	smartq_snd_device = platform_device_alloc("soc-audio", -1);
+	if (!smartq_snd_device)
+		return -ENOMEM;
+
+	platform_set_drvdata(smartq_snd_device, &smartq_snd_devdata);
+	smartq_snd_devdata.dev = &smartq_snd_device->dev;
+
+	ret = platform_device_add(smartq_snd_device);
+	if (ret) {
+		platform_device_put(smartq_snd_device);
+		return ret;
+	}
+
+	/* Initialise GPIOs used by amplifiers */
+	ret = gpio_request(S3C64XX_GPK(12), "amplifiers shutdown");
+	if (ret) {
+		dev_err(&smartq_snd_device->dev, "Failed to register GPK12\n");
+		goto err_unregister_device;
+	}
+
+	/* Disable amplifiers */
+	ret = gpio_direction_output(S3C64XX_GPK(12), 1);
+	if (ret) {
+		dev_err(&smartq_snd_device->dev, "Failed to configure GPK12\n");
+		goto err_free_gpio_amp_shut;
+	}
+
+	return 0;
+
+err_free_gpio_amp_shut:
+	gpio_free(S3C64XX_GPK(12));
+err_unregister_device:
+	platform_device_unregister(smartq_snd_device);
+
+	return ret;
+}
+
+static void __exit smartq_exit(void)
+{
+	snd_soc_jack_free_gpios(&smartq_jack, ARRAY_SIZE(smartq_jack_gpios),
+				smartq_jack_gpios);
+
+	platform_device_unregister(smartq_snd_device);
+}
+
+module_init(smartq_init);
+module_exit(smartq_exit);
+
+/* Module information */
+MODULE_AUTHOR("Maurus Cuelenaere <mcuelenaere@gmail.com>");
+MODULE_DESCRIPTION("ALSA SoC SmartQ WM8987");
+MODULE_LICENSE("GPL");