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@@ -0,0 +1,254 @@
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+/*
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+ * atmel_wm8904 - Atmel ASoC driver for boards with WM8904 codec.
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+ *
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+ * Copyright (C) 2012 Atmel
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+ *
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+ * Author: Bo Shen <voice.shen@atmel.com>
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+ *
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+ * GPLv2 or later
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+ */
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+
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+#include <linux/clk.h>
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+#include <linux/module.h>
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+#include <linux/of.h>
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+#include <linux/of_device.h>
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+#include <linux/pinctrl/consumer.h>
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+
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+#include <sound/soc.h>
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+
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+#include "../codecs/wm8904.h"
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+#include "atmel_ssc_dai.h"
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+
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+#define MCLK_RATE 32768
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+
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+static struct clk *mclk;
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+
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+static const struct snd_soc_dapm_widget atmel_asoc_wm8904_dapm_widgets[] = {
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+ SND_SOC_DAPM_HP("Headphone Jack", NULL),
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+ SND_SOC_DAPM_MIC("Mic", NULL),
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+ SND_SOC_DAPM_LINE("Line In Jack", NULL),
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+};
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+
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+static int atmel_asoc_wm8904_hw_params(struct snd_pcm_substream *substream,
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+ struct snd_pcm_hw_params *params)
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+{
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+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
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+ struct snd_soc_dai *codec_dai = rtd->codec_dai;
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+ int ret;
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+
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+ ret = snd_soc_dai_set_pll(codec_dai, WM8904_FLL_MCLK, WM8904_FLL_MCLK,
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+ 32768, params_rate(params) * 256);
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+ if (ret < 0) {
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+ pr_err("%s - failed to set wm8904 codec PLL.", __func__);
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+ return ret;
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+ }
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+
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+ /*
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+ * As here wm8904 use FLL output as its system clock
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+ * so calling set_sysclk won't care freq parameter
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+ * then we pass 0
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+ */
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+ ret = snd_soc_dai_set_sysclk(codec_dai, WM8904_CLK_FLL,
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+ 0, SND_SOC_CLOCK_IN);
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+ if (ret < 0) {
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+ pr_err("%s -failed to set wm8904 SYSCLK\n", __func__);
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+ return ret;
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+ }
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+
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+ return 0;
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+}
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+
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+static struct snd_soc_ops atmel_asoc_wm8904_ops = {
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+ .hw_params = atmel_asoc_wm8904_hw_params,
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+};
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+
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+static int atmel_set_bias_level(struct snd_soc_card *card,
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+ struct snd_soc_dapm_context *dapm,
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+ enum snd_soc_bias_level level)
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+{
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+ if (dapm->bias_level == SND_SOC_BIAS_STANDBY) {
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+ switch (level) {
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+ case SND_SOC_BIAS_PREPARE:
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+ clk_prepare_enable(mclk);
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+ break;
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+ case SND_SOC_BIAS_OFF:
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+ clk_disable_unprepare(mclk);
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+ break;
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+ default:
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+ break;
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+ }
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+ }
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+
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+ return 0;
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+};
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+
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+static struct snd_soc_dai_link atmel_asoc_wm8904_dailink = {
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+ .name = "WM8904",
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+ .stream_name = "WM8904 PCM",
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+ .codec_dai_name = "wm8904-hifi",
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+ .dai_fmt = SND_SOC_DAIFMT_I2S
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+ | SND_SOC_DAIFMT_NB_NF
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+ | SND_SOC_DAIFMT_CBM_CFM,
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+ .ops = &atmel_asoc_wm8904_ops,
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+};
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+
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+static struct snd_soc_card atmel_asoc_wm8904_card = {
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+ .name = "atmel_asoc_wm8904",
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+ .owner = THIS_MODULE,
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+ .set_bias_level = atmel_set_bias_level,
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+ .dai_link = &atmel_asoc_wm8904_dailink,
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+ .num_links = 1,
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+ .dapm_widgets = atmel_asoc_wm8904_dapm_widgets,
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+ .num_dapm_widgets = ARRAY_SIZE(atmel_asoc_wm8904_dapm_widgets),
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+ .fully_routed = true,
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+};
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+
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+static int atmel_asoc_wm8904_dt_init(struct platform_device *pdev)
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+{
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+ struct device_node *np = pdev->dev.of_node;
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+ struct device_node *codec_np, *cpu_np;
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+ struct snd_soc_card *card = &atmel_asoc_wm8904_card;
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+ struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
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+ int ret;
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+
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+ if (!np) {
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+ dev_err(&pdev->dev, "only device tree supported\n");
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+ return -EINVAL;
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+ }
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+
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+ ret = snd_soc_of_parse_card_name(card, "atmel,model");
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+ if (ret) {
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+ dev_err(&pdev->dev, "failed to parse card name\n");
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+ return ret;
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+ }
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+
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+ ret = snd_soc_of_parse_audio_routing(card, "atmel,audio-routing");
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+ if (ret) {
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+ dev_err(&pdev->dev, "failed to parse audio routing\n");
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+ return ret;
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+ }
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+
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+ cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
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+ if (!cpu_np) {
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+ dev_err(&pdev->dev, "failed to get dai and pcm info\n");
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+ ret = -EINVAL;
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+ return ret;
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+ }
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+ dailink->cpu_of_node = cpu_np;
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+ dailink->platform_of_node = cpu_np;
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+ of_node_put(cpu_np);
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+
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+ codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
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+ if (!codec_np) {
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+ dev_err(&pdev->dev, "failed to get codec info\n");
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+ ret = -EINVAL;
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+ return ret;
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+ }
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+ dailink->codec_of_node = codec_np;
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+ of_node_put(codec_np);
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+
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+ return 0;
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+}
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+
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+static int atmel_asoc_wm8904_probe(struct platform_device *pdev)
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+{
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+ struct snd_soc_card *card = &atmel_asoc_wm8904_card;
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+ struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
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+ struct clk *clk_src;
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+ struct pinctrl *pinctrl;
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+ int id, ret;
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+
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+ pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
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+ if (IS_ERR(pinctrl)) {
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+ dev_err(&pdev->dev, "failed to request pinctrl\n");
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+ return PTR_ERR(pinctrl);
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+ }
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+
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+ card->dev = &pdev->dev;
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+ ret = atmel_asoc_wm8904_dt_init(pdev);
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+ if (ret) {
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+ dev_err(&pdev->dev, "failed to init dt info\n");
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+ return ret;
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+ }
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+
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+ id = of_alias_get_id((struct device_node *)dailink->cpu_of_node, "ssc");
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+ ret = atmel_ssc_set_audio(id);
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+ if (ret != 0) {
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+ dev_err(&pdev->dev, "failed to set SSC %d for audio\n", id);
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+ return ret;
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+ }
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+
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+ mclk = clk_get(NULL, "pck0");
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+ if (IS_ERR(mclk)) {
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+ dev_err(&pdev->dev, "failed to get pck0\n");
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+ ret = PTR_ERR(mclk);
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+ goto err_set_audio;
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+ }
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+
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+ clk_src = clk_get(NULL, "clk32k");
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+ if (IS_ERR(clk_src)) {
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+ dev_err(&pdev->dev, "failed to get clk32k\n");
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+ ret = PTR_ERR(clk_src);
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+ goto err_set_audio;
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+ }
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+
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+ ret = clk_set_parent(mclk, clk_src);
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+ clk_put(clk_src);
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+ if (ret != 0) {
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+ dev_err(&pdev->dev, "failed to set MCLK parent\n");
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+ goto err_set_audio;
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+ }
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+
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+ dev_info(&pdev->dev, "setting pck0 to %dHz\n", MCLK_RATE);
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+ clk_set_rate(mclk, MCLK_RATE);
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+
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+ ret = snd_soc_register_card(card);
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+ if (ret) {
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+ dev_err(&pdev->dev, "snd_soc_register_card failed\n");
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+ goto err_set_audio;
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+ }
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+
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+ return 0;
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+
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+err_set_audio:
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+ atmel_ssc_put_audio(id);
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+ return ret;
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+}
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+
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+static int atmel_asoc_wm8904_remove(struct platform_device *pdev)
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+{
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+ struct snd_soc_card *card = platform_get_drvdata(pdev);
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+ struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
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+ int id;
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+
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+ id = of_alias_get_id((struct device_node *)dailink->cpu_of_node, "ssc");
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+
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+ snd_soc_unregister_card(card);
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+ atmel_ssc_put_audio(id);
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+
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+ return 0;
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+}
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+
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+#ifdef CONFIG_OF
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+static const struct of_device_id atmel_asoc_wm8904_dt_ids[] = {
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+ { .compatible = "atmel,asoc-wm8904", },
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+ { }
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+};
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+#endif
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+
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+static struct platform_driver atmel_asoc_wm8904_driver = {
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+ .driver = {
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+ .name = "atmel-wm8904-audio",
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+ .owner = THIS_MODULE,
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+ .of_match_table = of_match_ptr(atmel_asoc_wm8904_dt_ids),
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+ },
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+ .probe = atmel_asoc_wm8904_probe,
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+ .remove = atmel_asoc_wm8904_remove,
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+};
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+
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+module_platform_driver(atmel_asoc_wm8904_driver);
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+
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+/* Module information */
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+MODULE_AUTHOR("Bo Shen <voice.shen@atmel.com>");
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+MODULE_DESCRIPTION("ALSA SoC machine driver for Atmel EK with WM8904 codec");
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+MODULE_LICENSE("GPL");
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Mark Brown