ASoC: atmel: add wm8904 based audio machine driver

Add wm8904 based audio machine driver for Atmel EK board

The following ek board based on it
  - at91sam9n12ek
  - sama5d3xek (d31, d33, d34, d35)

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

3 files changed, 266 insertions, 0 deletions

diff --git a/sound/soc/atmel/Kconfig b/sound/soc/atmel/Kconfig
index 1c0b1858638c..986323b4caad 100644
--- a/sound/soc/atmel/Kconfig
+++ b/sound/soc/atmel/Kconfig
@@ -33,6 +33,16 @@ config SND_AT91_SOC_SAM9G20_WM8731
           Say Y if you want to add support for SoC audio on WM8731-based
           AT91sam9g20 evaluation board.
 
+config SND_ATMEL_SOC_WM8904
+        tristate "Atmel ASoC driver for boards using WM8904 codec"
+        depends on ARCH_AT91 && ATMEL_SSC && SND_ATMEL_SOC
+        select SND_ATMEL_SOC_SSC
+        select SND_ATMEL_SOC_DMA
+        select SND_SOC_WM8904
+        help
+          Say Y if you want to add support for Atmel ASoC driver for boards using
+          WM8904 codec.
+
 config SND_AT91_SOC_AFEB9260
         tristate "SoC Audio support for AFEB9260 board"
         depends on ARCH_AT91 && ATMEL_SSC && ARCH_AT91 && MACH_AFEB9260 && SND_ATMEL_SOC
diff --git a/sound/soc/atmel/Makefile b/sound/soc/atmel/Makefile
index 41967ccb6f41..922d4da57109 100644
--- a/sound/soc/atmel/Makefile
+++ b/sound/soc/atmel/Makefile
@@ -11,6 +11,8 @@ obj-$(CONFIG_SND_ATMEL_SOC_SSC) += snd-soc-atmel_ssc_dai.o
 
 # AT91 Machine Support
 snd-soc-sam9g20-wm8731-objs := sam9g20_wm8731.o
+snd-atmel-soc-wm8904-objs := atmel_wm8904.o
 
 obj-$(CONFIG_SND_AT91_SOC_SAM9G20_WM8731) += snd-soc-sam9g20-wm8731.o
+obj-$(CONFIG_SND_ATMEL_SOC_WM8904) += snd-atmel-soc-wm8904.o
 obj-$(CONFIG_SND_AT91_SOC_AFEB9260) += snd-soc-afeb9260.o
diff --git a/sound/soc/atmel/atmel_wm8904.c b/sound/soc/atmel/atmel_wm8904.c
new file mode 100644
index 000000000000..7222380131ea
--- /dev/null
+++ b/sound/soc/atmel/atmel_wm8904.c
@@ -0,0 +1,254 @@
+/*
+ * atmel_wm8904 - Atmel ASoC driver for boards with WM8904 codec.
+ *
+ * Copyright (C) 2012 Atmel
+ *
+ * Author: Bo Shen <voice.shen@atmel.com>
+ *
+ * GPLv2 or later
+ */
+
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/pinctrl/consumer.h>
+
+#include <sound/soc.h>
+
+#include "../codecs/wm8904.h"
+#include "atmel_ssc_dai.h"
+
+#define MCLK_RATE 32768
+
+static struct clk *mclk;
+
+static const struct snd_soc_dapm_widget atmel_asoc_wm8904_dapm_widgets[] = {
+        SND_SOC_DAPM_HP("Headphone Jack", NULL),
+        SND_SOC_DAPM_MIC("Mic", NULL),
+        SND_SOC_DAPM_LINE("Line In Jack", NULL),
+};
+
+static int atmel_asoc_wm8904_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->codec_dai;
+        int ret;
+
+        ret = snd_soc_dai_set_pll(codec_dai, WM8904_FLL_MCLK, WM8904_FLL_MCLK,
+                32768, params_rate(params) * 256);
+        if (ret < 0) {
+                pr_err("%s - failed to set wm8904 codec PLL.", __func__);
+                return ret;
+        }
+
+        /*
+         * As here wm8904 use FLL output as its system clock
+         * so calling set_sysclk won't care freq parameter
+         * then we pass 0
+         */
+        ret = snd_soc_dai_set_sysclk(codec_dai, WM8904_CLK_FLL,
+                        0, SND_SOC_CLOCK_IN);
+        if (ret < 0) {
+                pr_err("%s -failed to set wm8904 SYSCLK\n", __func__);
+                return ret;
+        }
+
+        return 0;
+}
+
+static struct snd_soc_ops atmel_asoc_wm8904_ops = {
+        .hw_params = atmel_asoc_wm8904_hw_params,
+};
+
+static int atmel_set_bias_level(struct snd_soc_card *card,
+                struct snd_soc_dapm_context *dapm,
+                enum snd_soc_bias_level level)
+{
+        if (dapm->bias_level == SND_SOC_BIAS_STANDBY) {
+                switch (level) {
+                case SND_SOC_BIAS_PREPARE:
+                        clk_prepare_enable(mclk);
+                        break;
+                case SND_SOC_BIAS_OFF:
+                        clk_disable_unprepare(mclk);
+                        break;
+                default:
+                        break;
+                }
+        }
+
+        return 0;
+};
+
+static struct snd_soc_dai_link atmel_asoc_wm8904_dailink = {
+        .name = "WM8904",
+        .stream_name = "WM8904 PCM",
+        .codec_dai_name = "wm8904-hifi",
+        .dai_fmt = SND_SOC_DAIFMT_I2S
+                | SND_SOC_DAIFMT_NB_NF
+                | SND_SOC_DAIFMT_CBM_CFM,
+        .ops = &atmel_asoc_wm8904_ops,
+};
+
+static struct snd_soc_card atmel_asoc_wm8904_card = {
+        .name = "atmel_asoc_wm8904",
+        .owner = THIS_MODULE,
+        .set_bias_level = atmel_set_bias_level,
+        .dai_link = &atmel_asoc_wm8904_dailink,
+        .num_links = 1,
+        .dapm_widgets = atmel_asoc_wm8904_dapm_widgets,
+        .num_dapm_widgets = ARRAY_SIZE(atmel_asoc_wm8904_dapm_widgets),
+        .fully_routed = true,
+};
+
+static int atmel_asoc_wm8904_dt_init(struct platform_device *pdev)
+{
+        struct device_node *np = pdev->dev.of_node;
+        struct device_node *codec_np, *cpu_np;
+        struct snd_soc_card *card = &atmel_asoc_wm8904_card;
+        struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
+        int ret;
+
+        if (!np) {
+                dev_err(&pdev->dev, "only device tree supported\n");
+                return -EINVAL;
+        }
+
+        ret = snd_soc_of_parse_card_name(card, "atmel,model");
+        if (ret) {
+                dev_err(&pdev->dev, "failed to parse card name\n");
+                return ret;
+        }
+
+        ret = snd_soc_of_parse_audio_routing(card, "atmel,audio-routing");
+        if (ret) {
+                dev_err(&pdev->dev, "failed to parse audio routing\n");
+                return ret;
+        }
+
+        cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
+        if (!cpu_np) {
+                dev_err(&pdev->dev, "failed to get dai and pcm info\n");
+                ret = -EINVAL;
+                return ret;
+        }
+        dailink->cpu_of_node = cpu_np;
+        dailink->platform_of_node = cpu_np;
+        of_node_put(cpu_np);
+
+        codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
+        if (!codec_np) {
+                dev_err(&pdev->dev, "failed to get codec info\n");
+                ret = -EINVAL;
+                return ret;
+        }
+        dailink->codec_of_node = codec_np;
+        of_node_put(codec_np);
+
+        return 0;
+}
+
+static int atmel_asoc_wm8904_probe(struct platform_device *pdev)
+{
+        struct snd_soc_card *card = &atmel_asoc_wm8904_card;
+        struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
+        struct clk *clk_src;
+        struct pinctrl *pinctrl;
+        int id, ret;
+
+        pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
+        if (IS_ERR(pinctrl)) {
+                dev_err(&pdev->dev, "failed to request pinctrl\n");
+                return PTR_ERR(pinctrl);
+        }
+
+        card->dev = &pdev->dev;
+        ret = atmel_asoc_wm8904_dt_init(pdev);
+        if (ret) {
+                dev_err(&pdev->dev, "failed to init dt info\n");
+                return ret;
+        }
+
+        id = of_alias_get_id((struct device_node *)dailink->cpu_of_node, "ssc");
+        ret = atmel_ssc_set_audio(id);
+        if (ret != 0) {
+                dev_err(&pdev->dev, "failed to set SSC %d for audio\n", id);
+                return ret;
+        }
+
+        mclk = clk_get(NULL, "pck0");
+        if (IS_ERR(mclk)) {
+                dev_err(&pdev->dev, "failed to get pck0\n");
+                ret = PTR_ERR(mclk);
+                goto err_set_audio;
+        }
+
+        clk_src = clk_get(NULL, "clk32k");
+        if (IS_ERR(clk_src)) {
+                dev_err(&pdev->dev, "failed to get clk32k\n");
+                ret = PTR_ERR(clk_src);
+                goto err_set_audio;
+        }
+
+        ret = clk_set_parent(mclk, clk_src);
+        clk_put(clk_src);
+        if (ret != 0) {
+                dev_err(&pdev->dev, "failed to set MCLK parent\n");
+                goto err_set_audio;
+        }
+
+        dev_info(&pdev->dev, "setting pck0 to %dHz\n", MCLK_RATE);
+        clk_set_rate(mclk, MCLK_RATE);
+
+        ret = snd_soc_register_card(card);
+        if (ret) {
+                dev_err(&pdev->dev, "snd_soc_register_card failed\n");
+                goto err_set_audio;
+        }
+
+        return 0;
+
+err_set_audio:
+        atmel_ssc_put_audio(id);
+        return ret;
+}
+
+static int atmel_asoc_wm8904_remove(struct platform_device *pdev)
+{
+        struct snd_soc_card *card = platform_get_drvdata(pdev);
+        struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
+        int id;
+
+        id = of_alias_get_id((struct device_node *)dailink->cpu_of_node, "ssc");
+
+        snd_soc_unregister_card(card);
+        atmel_ssc_put_audio(id);
+
+        return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id atmel_asoc_wm8904_dt_ids[] = {
+        { .compatible = "atmel,asoc-wm8904", },
+        { }
+};
+#endif
+
+static struct platform_driver atmel_asoc_wm8904_driver = {
+        .driver = {
+                .name = "atmel-wm8904-audio",
+                .owner = THIS_MODULE,
+                .of_match_table = of_match_ptr(atmel_asoc_wm8904_dt_ids),
+        },
+        .probe = atmel_asoc_wm8904_probe,
+        .remove = atmel_asoc_wm8904_remove,
+};
+
+module_platform_driver(atmel_asoc_wm8904_driver);
+
+/* Module information */
+MODULE_AUTHOR("Bo Shen <voice.shen@atmel.com>");
+MODULE_DESCRIPTION("ALSA SoC machine driver for Atmel EK with WM8904 codec");
+MODULE_LICENSE("GPL");