1/*
  2 * zylonite.c  --  SoC audio for Zylonite
  3 *
  4 * Copyright 2008 Wolfson Microelectronics PLC.
  5 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
  6 *
  7 * This program is free software; you can redistribute it and/or
  8 * modify it under the terms of the GNU General Public License as
  9 * published by the Free Software Foundation; either version 2 of the
 10 * License, or (at your option) any later version.
 11 *
 12 */
 13
 14#include <linux/module.h>
 15#include <linux/moduleparam.h>
 16#include <linux/device.h>
 17#include <linux/clk.h>
 18#include <linux/i2c.h>
 19#include <sound/core.h>
 20#include <sound/pcm.h>
 21#include <sound/pcm_params.h>
 22#include <sound/soc.h>
 23
 24#include "../codecs/wm9713.h"
 25#include "pxa-ssp.h"
 26
 27/*
 28 * There is a physical switch SW15 on the board which changes the MCLK
 29 * for the WM9713 between the standard AC97 master clock and the
 30 * output of the CLK_POUT signal from the PXA.
 31 */
 32static int clk_pout;
 33module_param(clk_pout, int, 0);
 34MODULE_PARM_DESC(clk_pout, "Use CLK_POUT as WM9713 MCLK (SW15 on board).");
 35
 36static struct clk *pout;
 37
 38static struct snd_soc_card zylonite;
 39
 40static const struct snd_soc_dapm_widget zylonite_dapm_widgets[] = {
 41	SND_SOC_DAPM_HP("Headphone", NULL),
 42	SND_SOC_DAPM_MIC("Headset Microphone", NULL),
 43	SND_SOC_DAPM_MIC("Handset Microphone", NULL),
 44	SND_SOC_DAPM_SPK("Multiactor", NULL),
 45	SND_SOC_DAPM_SPK("Headset Earpiece", NULL),
 46};
 47
 48/* Currently supported audio map */
 49static const struct snd_soc_dapm_route audio_map[] = {
 50
 51	/* Headphone output connected to HPL/HPR */
 52	{ "Headphone", NULL,  "HPL" },
 53	{ "Headphone", NULL,  "HPR" },
 54
 55	/* On-board earpiece */
 56	{ "Headset Earpiece", NULL, "OUT3" },
 57
 58	/* Headphone mic */
 59	{ "MIC2A", NULL, "Mic Bias" },
 60	{ "Mic Bias", NULL, "Headset Microphone" },
 61
 62	/* On-board mic */
 63	{ "MIC1", NULL, "Mic Bias" },
 64	{ "Mic Bias", NULL, "Handset Microphone" },
 65
 66	/* Multiactor differentially connected over SPKL/SPKR */
 67	{ "Multiactor", NULL, "SPKL" },
 68	{ "Multiactor", NULL, "SPKR" },
 69};
 70
 71static int zylonite_wm9713_init(struct snd_soc_pcm_runtime *rtd)
 72{
 73	if (clk_pout)
 74		snd_soc_dai_set_pll(rtd->codec_dai, 0, 0,
 75				    clk_get_rate(pout), 0);
 76
 77	return 0;
 78}
 79
 80static int zylonite_voice_hw_params(struct snd_pcm_substream *substream,
 81				    struct snd_pcm_hw_params *params)
 82{
 83	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 84	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 85	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 86	unsigned int pll_out = 0;
 87	unsigned int wm9713_div = 0;
 88	int ret = 0;
 89	int rate = params_rate(params);
 90	int width = snd_pcm_format_physical_width(params_format(params));
 91
 92	/* Only support ratios that we can generate neatly from the AC97
 93	 * based master clock - in particular, this excludes 44.1kHz.
 94	 * In most applications the voice DAC will be used for telephony
 95	 * data so multiples of 8kHz will be the common case.
 96	 */
 97	switch (rate) {
 98	case 8000:
 99		wm9713_div = 12;
100		break;
101	case 16000:
102		wm9713_div = 6;
103		break;
104	case 48000:
105		wm9713_div = 2;
106		break;
107	default:
108		/* Don't support OSS emulation */
109		return -EINVAL;
110	}
111
112	/* Add 1 to the width for the leading clock cycle */
113	pll_out = rate * (width + 1) * 8;
114
115	ret = snd_soc_dai_set_sysclk(cpu_dai, PXA_SSP_CLK_AUDIO, 0, 1);
116	if (ret < 0)
117		return ret;
118
119	ret = snd_soc_dai_set_pll(cpu_dai, 0, 0, 0, pll_out);
120	if (ret < 0)
121		return ret;
122
123	if (clk_pout)
124		ret = snd_soc_dai_set_clkdiv(codec_dai, WM9713_PCMCLK_PLL_DIV,
125					     WM9713_PCMDIV(wm9713_div));
126	else
127		ret = snd_soc_dai_set_clkdiv(codec_dai, WM9713_PCMCLK_DIV,
128					     WM9713_PCMDIV(wm9713_div));
129	if (ret < 0)
130		return ret;
131
132	return 0;
133}
134
135static const struct snd_soc_ops zylonite_voice_ops = {
136	.hw_params = zylonite_voice_hw_params,
137};
138
139static struct snd_soc_dai_link zylonite_dai[] = {
140{
141	.name = "AC97",
142	.stream_name = "AC97 HiFi",
143	.codec_name = "wm9713-codec",
144	.platform_name = "pxa-pcm-audio",
145	.cpu_dai_name = "pxa2xx-ac97",
146	.codec_dai_name = "wm9713-hifi",
147	.init = zylonite_wm9713_init,
148},
149{
150	.name = "AC97 Aux",
151	.stream_name = "AC97 Aux",
152	.codec_name = "wm9713-codec",
153	.platform_name = "pxa-pcm-audio",
154	.cpu_dai_name = "pxa2xx-ac97-aux",
155	.codec_dai_name = "wm9713-aux",
156},
157{
158	.name = "WM9713 Voice",
159	.stream_name = "WM9713 Voice",
160	.codec_name = "wm9713-codec",
161	.platform_name = "pxa-pcm-audio",
162	.cpu_dai_name = "pxa-ssp-dai.2",
163	.codec_dai_name = "wm9713-voice",
164	.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
165		   SND_SOC_DAIFMT_CBS_CFS,
166	.ops = &zylonite_voice_ops,
167},
168};
169
170static int zylonite_probe(struct snd_soc_card *card)
171{
172	int ret;
173
174	if (clk_pout) {
175		pout = clk_get(NULL, "CLK_POUT");
176		if (IS_ERR(pout)) {
177			dev_err(card->dev, "Unable to obtain CLK_POUT: %ld\n",
178				PTR_ERR(pout));
179			return PTR_ERR(pout);
180		}
181
182		ret = clk_enable(pout);
183		if (ret != 0) {
184			dev_err(card->dev, "Unable to enable CLK_POUT: %d\n",
185				ret);
186			clk_put(pout);
187			return ret;
188		}
189
190		dev_dbg(card->dev, "MCLK enabled at %luHz\n",
191			clk_get_rate(pout));
192	}
193
194	return 0;
195}
196
197static int zylonite_remove(struct snd_soc_card *card)
198{
199	if (clk_pout) {
200		clk_disable(pout);
201		clk_put(pout);
202	}
203
204	return 0;
205}
206
207static int zylonite_suspend_post(struct snd_soc_card *card)
208{
209	if (clk_pout)
210		clk_disable(pout);
211
212	return 0;
213}
214
215static int zylonite_resume_pre(struct snd_soc_card *card)
216{
217	int ret = 0;
218
219	if (clk_pout) {
220		ret = clk_enable(pout);
221		if (ret != 0)
222			dev_err(card->dev, "Unable to enable CLK_POUT: %d\n",
223				ret);
224	}
225
226	return ret;
227}
228
229static struct snd_soc_card zylonite = {
230	.name = "Zylonite",
231	.owner = THIS_MODULE,
232	.probe = &zylonite_probe,
233	.remove = &zylonite_remove,
234	.suspend_post = &zylonite_suspend_post,
235	.resume_pre = &zylonite_resume_pre,
236	.dai_link = zylonite_dai,
237	.num_links = ARRAY_SIZE(zylonite_dai),
238
239	.dapm_widgets = zylonite_dapm_widgets,
240	.num_dapm_widgets = ARRAY_SIZE(zylonite_dapm_widgets),
241	.dapm_routes = audio_map,
242	.num_dapm_routes = ARRAY_SIZE(audio_map),
243};
244
245static struct platform_device *zylonite_snd_ac97_device;
246
247static int __init zylonite_init(void)
248{
249	int ret;
250
251	zylonite_snd_ac97_device = platform_device_alloc("soc-audio", -1);
252	if (!zylonite_snd_ac97_device)
253		return -ENOMEM;
254
255	platform_set_drvdata(zylonite_snd_ac97_device, &zylonite);
256
257	ret = platform_device_add(zylonite_snd_ac97_device);
258	if (ret != 0)
259		platform_device_put(zylonite_snd_ac97_device);
260
261	return ret;
262}
263
264static void __exit zylonite_exit(void)
265{
266	platform_device_unregister(zylonite_snd_ac97_device);
267}
268
269module_init(zylonite_init);
270module_exit(zylonite_exit);
271
272MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
273MODULE_DESCRIPTION("ALSA SoC WM9713 Zylonite");
274MODULE_LICENSE("GPL");