ASoC: fsl: add imx-wm8962 machine driver

This is the initial imx-wm8962 device-tree-only machine driver working with
fsl_ssi driver. More features can be added on top of it later.
Signed-off-by: Nicolin Chen <b42378@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

Documentation/devicetree/bindings/sound/imx-audio-wm8962.txt

+Freescale i.MX audio complex with WM8962 codec
+
+Required properties:
+- compatible : "fsl,imx-audio-wm8962"
+- model : The user-visible name of this sound complex
+- ssi-controller : The phandle of the i.MX SSI controller
+- audio-codec : The phandle of the WM8962 audio codec
+- audio-routing : A list of the connections between audio components.
+  Each entry is a pair of strings, the first being the connection's sink,
+  the second being the connection's source. Valid names could be power
+  supplies, WM8962 pins, and the jacks on the board:
+
+  Power supplies:
+   * Mic Bias
+
+  Board connectors:
+   * Mic Jack
+   * Headphone Jack
+   * Ext Spk
+
+- mux-int-port : The internal port of the i.MX audio muxer (AUDMUX)
+- mux-ext-port : The external port of the i.MX audio muxer
+
+Note: The AUDMUX port numbering should start at 1, which is consistent with
+hardware manual.
+
+Example:
+
+sound {
+	compatible = "fsl,imx6q-sabresd-wm8962",
+		     "fsl,imx-audio-wm8962";
+	model = "wm8962-audio";
+	ssi-controller = <&ssi2>;
+	audio-codec = <&codec>;
+		audio-routing =
+		"Headphone Jack", "HPOUTL",
+		"Headphone Jack", "HPOUTR",
+		"Ext Spk", "SPKOUTL",
+		"Ext Spk", "SPKOUTR",
+		"MICBIAS", "AMIC",
+		"IN3R", "MICBIAS",
+		"DMIC", "MICBIAS",
+		"DMICDAT", "DMIC";
+	mux-int-port = <2>;
+	mux-ext-port = <3>;
+};

sound/soc/fsl/Kconfig

@@ -168,6 +168,18 @@ config SND_SOC_EUKREA_TLV320
 	  Enable I2S based access to the TLV320AIC23B codec attached
 	  to the SSI interface
 
+config SND_SOC_IMX_WM8962
+	tristate "SoC Audio support for i.MX boards with wm8962"
+	depends on OF && I2C
+	select SND_SOC_WM8962
+	select SND_SOC_IMX_PCM_DMA
+	select SND_SOC_IMX_AUDMUX
+	select SND_SOC_FSL_SSI
+	select SND_SOC_FSL_UTILS
+	help
+	  Say Y if you want to add support for SoC audio on an i.MX board with
+	  a wm8962 codec.
+
 config SND_SOC_IMX_SGTL5000
 	tristate "SoC Audio support for i.MX boards with sgtl5000"
 	depends on OF && I2C

sound/soc/fsl/Makefile

@@ -42,6 +42,7 @@ snd-soc-phycore-ac97-objs := phycore-ac97.o
 snd-soc-mx27vis-aic32x4-objs := mx27vis-aic32x4.o
 snd-soc-wm1133-ev1-objs := wm1133-ev1.o
 snd-soc-imx-sgtl5000-objs := imx-sgtl5000.o
+snd-soc-imx-wm8962-objs := imx-wm8962.o
 snd-soc-imx-mc13783-objs := imx-mc13783.o
 
 obj-$(CONFIG_SND_SOC_EUKREA_TLV320) += snd-soc-eukrea-tlv320.o
@@ -49,4 +50,5 @@ obj-$(CONFIG_SND_SOC_PHYCORE_AC97) += snd-soc-phycore-ac97.o
 obj-$(CONFIG_SND_SOC_MX27VIS_AIC32X4) += snd-soc-mx27vis-aic32x4.o
 obj-$(CONFIG_SND_MXC_SOC_WM1133_EV1) += snd-soc-wm1133-ev1.o
 obj-$(CONFIG_SND_SOC_IMX_SGTL5000) += snd-soc-imx-sgtl5000.o
+obj-$(CONFIG_SND_SOC_IMX_WM8962) += snd-soc-imx-wm8962.o
 obj-$(CONFIG_SND_SOC_IMX_MC13783) += snd-soc-imx-mc13783.o

sound/soc/fsl/imx-wm8962.c

+/*
+ * Copyright 2013 Freescale Semiconductor, Inc.
+ *
+ * Based on imx-sgtl5000.c
+ * Copyright 2012 Freescale Semiconductor, Inc.
+ * Copyright 2012 Linaro Ltd.
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/of_i2c.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+#include <sound/soc.h>
+#include <sound/pcm_params.h>
+#include <sound/soc-dapm.h>
+#include <linux/pinctrl/consumer.h>
+
+#include "../codecs/wm8962.h"
+#include "imx-audmux.h"
+
+#define DAI_NAME_SIZE	32
+
+struct imx_wm8962_data {
+	struct snd_soc_dai_link dai;
+	struct snd_soc_card card;
+	char codec_dai_name[DAI_NAME_SIZE];
+	char platform_name[DAI_NAME_SIZE];
+	struct clk *codec_clk;
+	unsigned int clk_frequency;
+};
+
+struct imx_priv {
+	struct platform_device *pdev;
+};
+static struct imx_priv card_priv;
+
+static const struct snd_soc_dapm_widget imx_wm8962_dapm_widgets[] = {
+	SND_SOC_DAPM_HP("Headphone Jack", NULL),
+	SND_SOC_DAPM_SPK("Ext Spk", NULL),
+	SND_SOC_DAPM_MIC("AMIC", NULL),
+	SND_SOC_DAPM_MIC("DMIC", NULL),
+};
+
+static int sample_rate = 44100;
+static snd_pcm_format_t sample_format = SNDRV_PCM_FORMAT_S16_LE;
+
+static int imx_hifi_hw_params(struct snd_pcm_substream *substream,
+		struct snd_pcm_hw_params *params)
+{
+	sample_rate = params_rate(params);
+	sample_format = params_format(params);
+
+	return 0;
+}
+
+static struct snd_soc_ops imx_hifi_ops = {
+	.hw_params = imx_hifi_hw_params,
+};
+
+static int imx_wm8962_set_bias_level(struct snd_soc_card *card,
+					struct snd_soc_dapm_context *dapm,
+					enum snd_soc_bias_level level)
+{
+	struct snd_soc_dai *codec_dai = card->rtd[0].codec_dai;
+	struct imx_priv *priv = &card_priv;
+	struct imx_wm8962_data *data = platform_get_drvdata(priv->pdev);
+	struct device *dev = &priv->pdev->dev;
+	unsigned int pll_out;
+	int ret;
+
+	if (dapm->dev != codec_dai->dev)
+		return 0;
+
+	switch (level) {
+	case SND_SOC_BIAS_PREPARE:
+		if (dapm->bias_level == SND_SOC_BIAS_STANDBY) {
+			if (sample_format == SNDRV_PCM_FORMAT_S24_LE)
+				pll_out = sample_rate * 384;
+			else
+				pll_out = sample_rate * 256;
+
+			ret = snd_soc_dai_set_pll(codec_dai, WM8962_FLL,
+					WM8962_FLL_MCLK, data->clk_frequency,
+					pll_out);
+			if (ret < 0) {
+				dev_err(dev, "failed to start FLL: %d\n", ret);
+				return ret;
+			}
+
+			ret = snd_soc_dai_set_sysclk(codec_dai,
+					WM8962_SYSCLK_FLL, pll_out,
+					SND_SOC_CLOCK_IN);
+			if (ret < 0) {
+				dev_err(dev, "failed to set SYSCLK: %d\n", ret);
+				return ret;
+			}
+		}
+		break;
+
+	case SND_SOC_BIAS_STANDBY:
+		if (dapm->bias_level == SND_SOC_BIAS_PREPARE) {
+			ret = snd_soc_dai_set_sysclk(codec_dai,
+					WM8962_SYSCLK_MCLK, data->clk_frequency,
+					SND_SOC_CLOCK_IN);
+			if (ret < 0) {
+				dev_err(dev,
+					"failed to switch away from FLL: %d\n",
+					ret);
+				return ret;
+			}
+
+			ret = snd_soc_dai_set_pll(codec_dai, WM8962_FLL,
+					0, 0, 0);
+			if (ret < 0) {
+				dev_err(dev, "failed to stop FLL: %d\n", ret);
+				return ret;
+			}
+		}
+		break;
+
+	default:
+		break;
+	}
+
+	dapm->bias_level = level;
+
+	return 0;
+}
+
+static int imx_wm8962_late_probe(struct snd_soc_card *card)
+{
+	struct snd_soc_dai *codec_dai = card->rtd[0].codec_dai;
+	struct imx_priv *priv = &card_priv;
+	struct imx_wm8962_data *data = platform_get_drvdata(priv->pdev);
+	struct device *dev = &priv->pdev->dev;
+	int ret;
+
+	ret = snd_soc_dai_set_sysclk(codec_dai, WM8962_SYSCLK_MCLK,
+			data->clk_frequency, SND_SOC_CLOCK_IN);
+	if (ret < 0)
+		dev_err(dev, "failed to set sysclk in %s\n", __func__);
+
+	return ret;
+}
+
+static int imx_wm8962_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct device_node *ssi_np, *codec_np;
+	struct platform_device *ssi_pdev;
+	struct imx_priv *priv = &card_priv;
+	struct i2c_client *codec_dev;
+	struct imx_wm8962_data *data;
+	int int_port, ext_port;
+	int ret;
+
+	priv->pdev = pdev;
+
+	ret = of_property_read_u32(np, "mux-int-port", &int_port);
+	if (ret) {
+		dev_err(&pdev->dev, "mux-int-port missing or invalid\n");
+		return ret;
+	}
+	ret = of_property_read_u32(np, "mux-ext-port", &ext_port);
+	if (ret) {
+		dev_err(&pdev->dev, "mux-ext-port missing or invalid\n");
+		return ret;
+	}
+
+	/*
+	 * The port numbering in the hardware manual starts at 1, while
+	 * the audmux API expects it starts at 0.
+	 */
+	int_port--;
+	ext_port--;
+	ret = imx_audmux_v2_configure_port(int_port,
+			IMX_AUDMUX_V2_PTCR_SYN |
+			IMX_AUDMUX_V2_PTCR_TFSEL(ext_port) |
+			IMX_AUDMUX_V2_PTCR_TCSEL(ext_port) |
+			IMX_AUDMUX_V2_PTCR_TFSDIR |
+			IMX_AUDMUX_V2_PTCR_TCLKDIR,
+			IMX_AUDMUX_V2_PDCR_RXDSEL(ext_port));
+	if (ret) {
+		dev_err(&pdev->dev, "audmux internal port setup failed\n");
+		return ret;
+	}
+	imx_audmux_v2_configure_port(ext_port,
+			IMX_AUDMUX_V2_PTCR_SYN,
+			IMX_AUDMUX_V2_PDCR_RXDSEL(int_port));
+	if (ret) {
+		dev_err(&pdev->dev, "audmux external port setup failed\n");
+		return ret;
+	}
+
+	ssi_np = of_parse_phandle(pdev->dev.of_node, "ssi-controller", 0);
+	codec_np = of_parse_phandle(pdev->dev.of_node, "audio-codec", 0);
+	if (!ssi_np || !codec_np) {
+		dev_err(&pdev->dev, "phandle missing or invalid\n");
+		ret = -EINVAL;
+		goto fail;
+	}
+
+	ssi_pdev = of_find_device_by_node(ssi_np);
+	if (!ssi_pdev) {
+		dev_err(&pdev->dev, "failed to find SSI platform device\n");
+		ret = -EINVAL;
+		goto fail;
+	}
+	codec_dev = of_find_i2c_device_by_node(codec_np);
+	if (!codec_dev || !codec_dev->driver) {
+		dev_err(&pdev->dev, "failed to find codec platform device\n");
+		return -EINVAL;
+	}
+
+	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+	if (!data) {
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	data->codec_clk = devm_clk_get(&codec_dev->dev, NULL);
+	if (IS_ERR(data->codec_clk)) {
+		ret = PTR_ERR(data->codec_clk);
+		dev_err(&codec_dev->dev, "failed to get codec clk: %d\n", ret);
+		goto fail;
+	}
+
+	data->clk_frequency = clk_get_rate(data->codec_clk);
+	ret = clk_prepare_enable(data->codec_clk);
+	if (ret) {
+		dev_err(&codec_dev->dev, "failed to enable codec clk: %d\n", ret);
+		goto fail;
+	}
+
+	data->dai.name = "HiFi";
+	data->dai.stream_name = "HiFi";
+	data->dai.codec_dai_name = "wm8962";
+	data->dai.codec_of_node = codec_np;
+	data->dai.cpu_dai_name = dev_name(&ssi_pdev->dev);
+	data->dai.platform_of_node = ssi_np;
+	data->dai.ops = &imx_hifi_ops;
+	data->dai.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
+			    SND_SOC_DAIFMT_CBM_CFM;
+
+	data->card.dev = &pdev->dev;
+	ret = snd_soc_of_parse_card_name(&data->card, "model");
+	if (ret)
+		goto clk_fail;
+	ret = snd_soc_of_parse_audio_routing(&data->card, "audio-routing");
+	if (ret)
+		goto clk_fail;
+	data->card.num_links = 1;
+	data->card.dai_link = &data->dai;
+	data->card.dapm_widgets = imx_wm8962_dapm_widgets;
+	data->card.num_dapm_widgets = ARRAY_SIZE(imx_wm8962_dapm_widgets);
+
+	data->card.late_probe = imx_wm8962_late_probe;
+	data->card.set_bias_level = imx_wm8962_set_bias_level;
+
+	ret = snd_soc_register_card(&data->card);
+	if (ret) {
+		dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
+		goto clk_fail;
+	}
+
+	platform_set_drvdata(pdev, data);
+	of_node_put(ssi_np);
+	of_node_put(codec_np);
+
+	return 0;
+
+clk_fail:
+	if (!IS_ERR(data->codec_clk))
+		clk_disable_unprepare(data->codec_clk);
+fail:
+	if (ssi_np)
+		of_node_put(ssi_np);
+	if (codec_np)
+		of_node_put(codec_np);
+
+	return ret;
+}
+
+static int imx_wm8962_remove(struct platform_device *pdev)
+{
+	struct imx_wm8962_data *data = platform_get_drvdata(pdev);
+
+	if (!IS_ERR(data->codec_clk))
+		clk_disable_unprepare(data->codec_clk);
+	snd_soc_unregister_card(&data->card);
+
+	return 0;
+}
+
+static const struct of_device_id imx_wm8962_dt_ids[] = {
+	{ .compatible = "fsl,imx-audio-wm8962", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, imx_wm8962_dt_ids);
+
+static struct platform_driver imx_wm8962_driver = {
+	.driver = {
+		.name = "imx-wm8962",
+		.owner = THIS_MODULE,
+		.of_match_table = imx_wm8962_dt_ids,
+	},
+	.probe = imx_wm8962_probe,
+	.remove = imx_wm8962_remove,
+};
+module_platform_driver(imx_wm8962_driver);
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("Freescale i.MX WM8962 ASoC machine driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:imx-wm8962");