[deliverable/linux.git] / sound / soc / atmel / atmel_wm8904.c

/*
 * 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");
Commit	Line	Data
52f19b14 BS	1	/*
	2	* atmel_wm8904 - Atmel ASoC driver for boards with WM8904 codec.
	3	*
	4	* Copyright (C) 2012 Atmel
	5	*
	6	* Author: Bo Shen <voice.shen@atmel.com>
	7	*
	8	* GPLv2 or later
	9	*/
	10
	11	#include <linux/clk.h>
	12	#include <linux/module.h>
	13	#include <linux/of.h>
	14	#include <linux/of_device.h>
	15	#include <linux/pinctrl/consumer.h>
	16
	17	#include <sound/soc.h>
	18
	19	#include "../codecs/wm8904.h"
	20	#include "atmel_ssc_dai.h"
	21
	22	#define MCLK_RATE 32768
	23
	24	static struct clk *mclk;
	25
	26	static const struct snd_soc_dapm_widget atmel_asoc_wm8904_dapm_widgets[] = {
	27	SND_SOC_DAPM_HP("Headphone Jack", NULL),
	28	SND_SOC_DAPM_MIC("Mic", NULL),
	29	SND_SOC_DAPM_LINE("Line In Jack", NULL),
	30	};
	31
	32	static int atmel_asoc_wm8904_hw_params(struct snd_pcm_substream *substream,
	33	struct snd_pcm_hw_params *params)
	34	{
	35	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	36	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	37	int ret;
	38
	39	ret = snd_soc_dai_set_pll(codec_dai, WM8904_FLL_MCLK, WM8904_FLL_MCLK,
	40	32768, params_rate(params) * 256);
	41	if (ret < 0) {
	42	pr_err("%s - failed to set wm8904 codec PLL.", __func__);
	43	return ret;
	44	}
	45
	46	/*
	47	* As here wm8904 use FLL output as its system clock
	48	* so calling set_sysclk won't care freq parameter
	49	* then we pass 0
	50	*/
	51	ret = snd_soc_dai_set_sysclk(codec_dai, WM8904_CLK_FLL,
	52	0, SND_SOC_CLOCK_IN);
	53	if (ret < 0) {
	54	pr_err("%s -failed to set wm8904 SYSCLK\n", __func__);
	55	return ret;
	56	}
	57
	58	return 0;
	59	}
	60
	61	static struct snd_soc_ops atmel_asoc_wm8904_ops = {
	62	.hw_params = atmel_asoc_wm8904_hw_params,
	63	};
	64
65	static int atmel_set_bias_level(struct snd_soc_card *card,
66	struct snd_soc_dapm_context *dapm,
67	enum snd_soc_bias_level level)
68	{
69	if (dapm->bias_level == SND_SOC_BIAS_STANDBY) {
70	switch (level) {
71	case SND_SOC_BIAS_PREPARE:
72	clk_prepare_enable(mclk);
73	break;
74	case SND_SOC_BIAS_OFF:
75	clk_disable_unprepare(mclk);
76	break;
77	default:
78	break;
79	}
80	}
81
82	return 0;
83	};
84
85	static struct snd_soc_dai_link atmel_asoc_wm8904_dailink = {
86	.name = "WM8904",
87	.stream_name = "WM8904 PCM",
88	.codec_dai_name = "wm8904-hifi",
89	.dai_fmt = SND_SOC_DAIFMT_I2S
90	\| SND_SOC_DAIFMT_NB_NF
91	\| SND_SOC_DAIFMT_CBM_CFM,
92	.ops = &atmel_asoc_wm8904_ops,
93	};
94
95	static struct snd_soc_card atmel_asoc_wm8904_card = {
96	.name = "atmel_asoc_wm8904",
97	.owner = THIS_MODULE,
98	.set_bias_level = atmel_set_bias_level,
99	.dai_link = &atmel_asoc_wm8904_dailink,
100	.num_links = 1,
101	.dapm_widgets = atmel_asoc_wm8904_dapm_widgets,
102	.num_dapm_widgets = ARRAY_SIZE(atmel_asoc_wm8904_dapm_widgets),
103	.fully_routed = true,
104	};
105
106	static int atmel_asoc_wm8904_dt_init(struct platform_device *pdev)
107	{
108	struct device_node *np = pdev->dev.of_node;
109	struct device_node codec_np, cpu_np;
110	struct snd_soc_card *card = &atmel_asoc_wm8904_card;
111	struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
112	int ret;
113
114	if (!np) {
115	dev_err(&pdev->dev, "only device tree supported\n");
116	return -EINVAL;
117	}
118
119	ret = snd_soc_of_parse_card_name(card, "atmel,model");
120	if (ret) {
121	dev_err(&pdev->dev, "failed to parse card name\n");
122	return ret;
123	}
124
125	ret = snd_soc_of_parse_audio_routing(card, "atmel,audio-routing");
126	if (ret) {
127	dev_err(&pdev->dev, "failed to parse audio routing\n");
128	return ret;
129	}
130
131	cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
132	if (!cpu_np) {
133	dev_err(&pdev->dev, "failed to get dai and pcm info\n");
134	ret = -EINVAL;
135	return ret;
136	}
137	dailink->cpu_of_node = cpu_np;
138	dailink->platform_of_node = cpu_np;
139	of_node_put(cpu_np);
140
141	codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
142	if (!codec_np) {
143	dev_err(&pdev->dev, "failed to get codec info\n");
144	ret = -EINVAL;
145	return ret;
146	}
147	dailink->codec_of_node = codec_np;
148	of_node_put(codec_np);
149
150	return 0;
151	}
152
153	static int atmel_asoc_wm8904_probe(struct platform_device *pdev)
154	{
155	struct snd_soc_card *card = &atmel_asoc_wm8904_card;
156	struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
157	struct clk *clk_src;
158	struct pinctrl *pinctrl;
159	int id, ret;
160
161	pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
162	if (IS_ERR(pinctrl)) {
163	dev_err(&pdev->dev, "failed to request pinctrl\n");
164	return PTR_ERR(pinctrl);
165	}
166
167	card->dev = &pdev->dev;
168	ret = atmel_asoc_wm8904_dt_init(pdev);
169	if (ret) {
170	dev_err(&pdev->dev, "failed to init dt info\n");
171	return ret;
172	}
173
174	id = of_alias_get_id((struct device_node *)dailink->cpu_of_node, "ssc");
175	ret = atmel_ssc_set_audio(id);
176	if (ret != 0) {
177	dev_err(&pdev->dev, "failed to set SSC %d for audio\n", id);
178	return ret;
179	}
180
181	mclk = clk_get(NULL, "pck0");
182	if (IS_ERR(mclk)) {
183	dev_err(&pdev->dev, "failed to get pck0\n");
184	ret = PTR_ERR(mclk);
185	goto err_set_audio;
186	}
187
188	clk_src = clk_get(NULL, "clk32k");
189	if (IS_ERR(clk_src)) {
190	dev_err(&pdev->dev, "failed to get clk32k\n");
191	ret = PTR_ERR(clk_src);
192	goto err_set_audio;
193	}
194
195	ret = clk_set_parent(mclk, clk_src);
196	clk_put(clk_src);
197	if (ret != 0) {
198	dev_err(&pdev->dev, "failed to set MCLK parent\n");
199	goto err_set_audio;
200	}
201
202	dev_info(&pdev->dev, "setting pck0 to %dHz\n", MCLK_RATE);
203	clk_set_rate(mclk, MCLK_RATE);
204
205	ret = snd_soc_register_card(card);
206	if (ret) {
207	dev_err(&pdev->dev, "snd_soc_register_card failed\n");
208	goto err_set_audio;
209	}
210
211	return 0;
212
213	err_set_audio:
214	atmel_ssc_put_audio(id);
215	return ret;
216	}
217
218	static int atmel_asoc_wm8904_remove(struct platform_device *pdev)
219	{
220	struct snd_soc_card *card = platform_get_drvdata(pdev);
221	struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
222	int id;
223
224	id = of_alias_get_id((struct device_node *)dailink->cpu_of_node, "ssc");
225
226	snd_soc_unregister_card(card);
227	atmel_ssc_put_audio(id);
228
229	return 0;
230	}
231
232	#ifdef CONFIG_OF
233	static const struct of_device_id atmel_asoc_wm8904_dt_ids[] = {
234	{ .compatible = "atmel,asoc-wm8904", },
235	{ }
236	};
237	#endif
238
239	static struct platform_driver atmel_asoc_wm8904_driver = {
240	.driver = {
241	.name = "atmel-wm8904-audio",
242	.owner = THIS_MODULE,
243	.of_match_table = of_match_ptr(atmel_asoc_wm8904_dt_ids),
244	},
245	.probe = atmel_asoc_wm8904_probe,
246	.remove = atmel_asoc_wm8904_remove,
247	};
248
249	module_platform_driver(atmel_asoc_wm8904_driver);
250
251	/* Module information */
252	MODULE_AUTHOR("Bo Shen <voice.shen@atmel.com>");
253	MODULE_DESCRIPTION("ALSA SoC machine driver for Atmel EK with WM8904 codec");
254	MODULE_LICENSE("GPL");