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 sh_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	codec_freq = rate * 512;
67	/*
68	 * This propagates the parent frequency change to children and
69	 * recalculates the frequency table
70	 */
71	clk_set_rate(&siumckb_clk, codec_freq);
72	dev_dbg(codec_dai->dev, "%s: configure %luHz\n", __func__, codec_freq);
73
74	ret = snd_soc_dai_set_sysclk(rtd->cpu_dai, SIU_CLKB_EXT,
75				     codec_freq / 2, SND_SOC_CLOCK_IN);
76
77	if (!ret)
78		use_count++;
79
80	return ret;
81}
82
83static int migor_hw_free(struct snd_pcm_substream *substream)
84{
85	struct snd_soc_pcm_runtime *rtd = substream->private_data;
86	struct snd_soc_dai *codec_dai = rtd->codec_dai;
87
88	if (use_count) {
89		use_count--;
90
91		if (!use_count)
92			snd_soc_dai_set_sysclk(codec_dai, WM8978_PLL, 0,
93					       SND_SOC_CLOCK_IN);
94	} else {
95		dev_dbg(codec_dai->dev, "Unbalanced hw_free!\n");
96	}
97
98	return 0;
99}
100
101static struct snd_soc_ops migor_dai_ops = {
102	.hw_params = migor_hw_params,
103	.hw_free = migor_hw_free,
104};
105
106static const struct snd_soc_dapm_widget migor_dapm_widgets[] = {
107	SND_SOC_DAPM_HP("Headphone", NULL),
108	SND_SOC_DAPM_MIC("Onboard Microphone", NULL),
109	SND_SOC_DAPM_MIC("External Microphone", NULL),
110};
111
112static const struct snd_soc_dapm_route audio_map[] = {
113	/* Headphone output connected to LHP/RHP, enable OUT4 for VMID */
114	{ "Headphone", NULL,  "OUT4 VMID" },
115	{ "OUT4 VMID", NULL,  "LHP" },
116	{ "OUT4 VMID", NULL,  "RHP" },
117
118	/* On-board microphone */
119	{ "RMICN", NULL, "Mic Bias" },
120	{ "RMICP", NULL, "Mic Bias" },
121	{ "Mic Bias", NULL, "Onboard Microphone" },
122
123	/* External microphone */
124	{ "LMICN", NULL, "Mic Bias" },
125	{ "LMICP", NULL, "Mic Bias" },
126	{ "Mic Bias", NULL, "External Microphone" },
127};
128
129/* migor digital audio interface glue - connects codec <--> CPU */
130static struct snd_soc_dai_link migor_dai = {
131	.name = "wm8978",
132	.stream_name = "WM8978",
133	.cpu_dai_name = "siu-pcm-audio",
134	.codec_dai_name = "wm8978-hifi",
135	.platform_name = "siu-pcm-audio",
136	.codec_name = "wm8978.0-001a",
137	.dai_fmt = SND_SOC_DAIFMT_NB_IF | SND_SOC_DAIFMT_I2S |
138		   SND_SOC_DAIFMT_CBS_CFS,
139	.ops = &migor_dai_ops,
140};
141
142/* migor audio machine driver */
143static struct snd_soc_card snd_soc_migor = {
144	.name = "Migo-R",
145	.owner = THIS_MODULE,
146	.dai_link = &migor_dai,
147	.num_links = 1,
148
149	.dapm_widgets = migor_dapm_widgets,
150	.num_dapm_widgets = ARRAY_SIZE(migor_dapm_widgets),
151	.dapm_routes = audio_map,
152	.num_dapm_routes = ARRAY_SIZE(audio_map),
153};
154
155static struct platform_device *migor_snd_device;
156
157static int __init migor_init(void)
158{
159	int ret;
160
161	ret = clk_register(&siumckb_clk);
162	if (ret < 0)
163		return ret;
164
165	siumckb_lookup = clkdev_create(&siumckb_clk, "siumckb_clk", NULL);
166	if (!siumckb_lookup) {
167		ret = -ENOMEM;
168		goto eclkdevalloc;
169	}
170
171	/* Port number used on this machine: port B */
172	migor_snd_device = platform_device_alloc("soc-audio", 1);
173	if (!migor_snd_device) {
174		ret = -ENOMEM;
175		goto epdevalloc;
176	}
177
178	platform_set_drvdata(migor_snd_device, &snd_soc_migor);
179
180	ret = platform_device_add(migor_snd_device);
181	if (ret)
182		goto epdevadd;
183
184	return 0;
185
186epdevadd:
187	platform_device_put(migor_snd_device);
188epdevalloc:
189	clkdev_drop(siumckb_lookup);
190eclkdevalloc:
191	clk_unregister(&siumckb_clk);
192	return ret;
193}
194
195static void __exit migor_exit(void)
196{
197	clkdev_drop(siumckb_lookup);
198	clk_unregister(&siumckb_clk);
199	platform_device_unregister(migor_snd_device);
200}
201
202module_init(migor_init);
203module_exit(migor_exit);
204
205MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
206MODULE_DESCRIPTION("ALSA SoC Migor");
207MODULE_LICENSE("GPL v2");
208