1/*
  2 * ALSA SoC driver for Migo-R
  3 *
  4 * Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
  5 *
  6 * This program is free software; you can redistribute it and/or modify
  7 * it under the terms of the GNU General Public License version 2 as
  8 * published by the Free Software Foundation.
  9 */
 10
 11#include <linux/clkdev.h>
 12#include <linux/device.h>
 13#include <linux/firmware.h>
 14#include <linux/module.h>
 15
 16#include <asm/clock.h>
 17
 18#include <cpu/sh7722.h>
 19
 20#include <sound/core.h>
 21#include <sound/pcm.h>
 22#include <sound/soc.h>
 23
 24#include "../codecs/wm8978.h"
 25#include "siu.h"
 26
 27/* Default 8000Hz sampling frequency */
 28static unsigned long codec_freq = 8000 * 512;
 29
 30static unsigned int use_count;
 31
 32/* External clock, sourced from the codec at the SIUMCKB pin */
 33static unsigned long siumckb_recalc(struct clk *clk)
 34{
 35	return codec_freq;
 36}
 37
 38static struct clk_ops siumckb_clk_ops = {
 39	.recalc = siumckb_recalc,
 40};
 41
 42static struct clk siumckb_clk = {
 43	.ops		= &siumckb_clk_ops,
 44	.rate		= 0, /* initialised at run-time */
 45};
 46
 47static struct clk_lookup *siumckb_lookup;
 48
 49static int migor_hw_params(struct snd_pcm_substream *substream,
 50			   struct snd_pcm_hw_params *params)
 51{
 52	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 53	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 54	int ret;
 55	unsigned int rate = params_rate(params);
 56
 57	ret = snd_soc_dai_set_sysclk(codec_dai, WM8978_PLL, 13000000,
 58				     SND_SOC_CLOCK_IN);
 59	if (ret < 0)
 60		return ret;
 61
 62	ret = snd_soc_dai_set_clkdiv(codec_dai, WM8978_OPCLKRATE, rate * 512);
 63	if (ret < 0)
 64		return ret;
 65
 66	ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_NB_IF |
 67				  SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS);
 68	if (ret < 0)
 69		return ret;
 70
 71	ret = snd_soc_dai_set_fmt(rtd->cpu_dai, SND_SOC_DAIFMT_NB_IF |
 72				  SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS);
 73	if (ret < 0)
 74		return ret;
 75
 76	codec_freq = rate * 512;
 77	/*
 78	 * This propagates the parent frequency change to children and
 79	 * recalculates the frequency table
 80	 */
 81	clk_set_rate(&siumckb_clk, codec_freq);
 82	dev_dbg(codec_dai->dev, "%s: configure %luHz\n", __func__, codec_freq);
 83
 84	ret = snd_soc_dai_set_sysclk(rtd->cpu_dai, SIU_CLKB_EXT,
 85				     codec_freq / 2, SND_SOC_CLOCK_IN);
 86
 87	if (!ret)
 88		use_count++;
 89
 90	return ret;
 91}
 92
 93static int migor_hw_free(struct snd_pcm_substream *substream)
 94{
 95	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 96	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 97
 98	if (use_count) {
 99		use_count--;
100
101		if (!use_count)
102			snd_soc_dai_set_sysclk(codec_dai, WM8978_PLL, 0,
103					       SND_SOC_CLOCK_IN);
104	} else {
105		dev_dbg(codec_dai->dev, "Unbalanced hw_free!\n");
106	}
107
108	return 0;
109}
110
111static struct snd_soc_ops migor_dai_ops = {
112	.hw_params = migor_hw_params,
113	.hw_free = migor_hw_free,
114};
115
116static const struct snd_soc_dapm_widget migor_dapm_widgets[] = {
117	SND_SOC_DAPM_HP("Headphone", NULL),
118	SND_SOC_DAPM_MIC("Onboard Microphone", NULL),
119	SND_SOC_DAPM_MIC("External Microphone", NULL),
120};
121
122static const struct snd_soc_dapm_route audio_map[] = {
123	/* Headphone output connected to LHP/RHP, enable OUT4 for VMID */
124	{ "Headphone", NULL,  "OUT4 VMID" },
125	{ "OUT4 VMID", NULL,  "LHP" },
126	{ "OUT4 VMID", NULL,  "RHP" },
127
128	/* On-board microphone */
129	{ "RMICN", NULL, "Mic Bias" },
130	{ "RMICP", NULL, "Mic Bias" },
131	{ "Mic Bias", NULL, "Onboard Microphone" },
132
133	/* External microphone */
134	{ "LMICN", NULL, "Mic Bias" },
135	{ "LMICP", NULL, "Mic Bias" },
136	{ "Mic Bias", NULL, "External Microphone" },
137};
138
139static int migor_dai_init(struct snd_soc_pcm_runtime *rtd)
140{
141	struct snd_soc_codec *codec = rtd->codec;
142	struct snd_soc_dapm_context *dapm = &codec->dapm;
143
144	snd_soc_dapm_new_controls(dapm, migor_dapm_widgets,
145				  ARRAY_SIZE(migor_dapm_widgets));
146
147	snd_soc_dapm_add_routes(dapm, audio_map, ARRAY_SIZE(audio_map));
148
149	return 0;
150}
151
152/* migor digital audio interface glue - connects codec <--> CPU */
153static struct snd_soc_dai_link migor_dai = {
154	.name = "wm8978",
155	.stream_name = "WM8978",
156	.cpu_dai_name = "siu-i2s-dai",
157	.codec_dai_name = "wm8978-hifi",
158	.platform_name = "siu-pcm-audio",
159	.codec_name = "wm8978.0-001a",
160	.ops = &migor_dai_ops,
161	.init = migor_dai_init,
162};
163
164/* migor audio machine driver */
165static struct snd_soc_card snd_soc_migor = {
166	.name = "Migo-R",
167	.dai_link = &migor_dai,
168	.num_links = 1,
169};
170
171static struct platform_device *migor_snd_device;
172
173static int __init migor_init(void)
174{
175	int ret;
176
177	ret = clk_register(&siumckb_clk);
178	if (ret < 0)
179		return ret;
180
181	siumckb_lookup = clkdev_alloc(&siumckb_clk, "siumckb_clk", NULL);
182	if (!siumckb_lookup) {
183		ret = -ENOMEM;
184		goto eclkdevalloc;
185	}
186	clkdev_add(siumckb_lookup);
187
188	/* Port number used on this machine: port B */
189	migor_snd_device = platform_device_alloc("soc-audio", 1);
190	if (!migor_snd_device) {
191		ret = -ENOMEM;
192		goto epdevalloc;
193	}
194
195	platform_set_drvdata(migor_snd_device, &snd_soc_migor);
196
197	ret = platform_device_add(migor_snd_device);
198	if (ret)
199		goto epdevadd;
200
201	return 0;
202
203epdevadd:
204	platform_device_put(migor_snd_device);
205epdevalloc:
206	clkdev_drop(siumckb_lookup);
207eclkdevalloc:
208	clk_unregister(&siumckb_clk);
209	return ret;
210}
211
212static void __exit migor_exit(void)
213{
214	clkdev_drop(siumckb_lookup);
215	clk_unregister(&siumckb_clk);
216	platform_device_unregister(migor_snd_device);
217}
218
219module_init(migor_init);
220module_exit(migor_exit);
221
222MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
223MODULE_DESCRIPTION("ALSA SoC Migor");
224MODULE_LICENSE("GPL v2");