1/*
  2 * raumfeld_audio.c  --  SoC audio for Raumfeld audio devices
  3 *
  4 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
  5 *
  6 * based on code from:
  7 *
  8 *    Wolfson Microelectronics PLC.
  9 *    Openedhand Ltd.
 10 *    Liam Girdwood <lrg@slimlogic.co.uk>
 11 *    Richard Purdie <richard@openedhand.com>
 12 *
 13 * This program is free software; you can redistribute  it and/or modify it
 14 * under  the terms of  the GNU General  Public License as published by the
 15 * Free Software Foundation;  either version 2 of the  License, or (at your
 16 * option) any later version.
 17 */
 18
 19#include <linux/module.h>
 20#include <linux/i2c.h>
 21#include <linux/delay.h>
 22#include <linux/gpio.h>
 23#include <sound/pcm.h>
 24#include <sound/soc.h>
 25
 26#include <asm/mach-types.h>
 27
 28#include "pxa-ssp.h"
 29
 30#define GPIO_SPDIF_RESET	(38)
 31#define GPIO_MCLK_RESET		(111)
 32#define GPIO_CODEC_RESET	(120)
 33
 34static struct i2c_client *max9486_client;
 35static struct i2c_board_info max9486_hwmon_info = {
 36	I2C_BOARD_INFO("max9485", 0x63),
 37};
 38
 39#define MAX9485_MCLK_FREQ_112896 0x22
 40#define MAX9485_MCLK_FREQ_122880 0x23
 41#define MAX9485_MCLK_FREQ_225792 0x32
 42#define MAX9485_MCLK_FREQ_245760 0x33
 43
 44static void set_max9485_clk(char clk)
 45{
 46	i2c_master_send(max9486_client, &clk, 1);
 47}
 48
 49static void raumfeld_enable_audio(bool en)
 50{
 51	if (en) {
 52		gpio_set_value(GPIO_MCLK_RESET, 1);
 53
 54		/* wait some time to let the clocks become stable */
 55		msleep(100);
 56
 57		gpio_set_value(GPIO_SPDIF_RESET, 1);
 58		gpio_set_value(GPIO_CODEC_RESET, 1);
 59	} else {
 60		gpio_set_value(GPIO_MCLK_RESET, 0);
 61		gpio_set_value(GPIO_SPDIF_RESET, 0);
 62		gpio_set_value(GPIO_CODEC_RESET, 0);
 63	}
 64}
 65
 66/* CS4270 */
 67static int raumfeld_cs4270_startup(struct snd_pcm_substream *substream)
 68{
 69	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 70	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 71
 72	/* set freq to 0 to enable all possible codec sample rates */
 73	return snd_soc_dai_set_sysclk(codec_dai, 0, 0, 0);
 74}
 75
 76static void raumfeld_cs4270_shutdown(struct snd_pcm_substream *substream)
 77{
 78	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 79	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 80
 81	/* set freq to 0 to enable all possible codec sample rates */
 82	snd_soc_dai_set_sysclk(codec_dai, 0, 0, 0);
 83}
 84
 85static int raumfeld_cs4270_hw_params(struct snd_pcm_substream *substream,
 86				     struct snd_pcm_hw_params *params)
 87{
 88	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 89	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 90	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 91	unsigned int clk = 0;
 92	int ret = 0;
 93
 94	switch (params_rate(params)) {
 95	case 44100:
 96		set_max9485_clk(MAX9485_MCLK_FREQ_112896);
 97		clk = 11289600;
 98		break;
 99	case 48000:
100		set_max9485_clk(MAX9485_MCLK_FREQ_122880);
101		clk = 12288000;
102		break;
103	case 88200:
104		set_max9485_clk(MAX9485_MCLK_FREQ_225792);
105		clk = 22579200;
106		break;
107	case 96000:
108		set_max9485_clk(MAX9485_MCLK_FREQ_245760);
109		clk = 24576000;
110		break;
111	default:
112		return -EINVAL;
113	}
114
115	ret = snd_soc_dai_set_sysclk(codec_dai, 0, clk, 0);
116	if (ret < 0)
117		return ret;
118
119	/* setup the CPU DAI */
120	ret = snd_soc_dai_set_pll(cpu_dai, 0, 0, 0, clk);
121	if (ret < 0)
122		return ret;
123
124	ret = snd_soc_dai_set_clkdiv(cpu_dai, PXA_SSP_DIV_SCR, 4);
125	if (ret < 0)
126		return ret;
127
128	ret = snd_soc_dai_set_sysclk(cpu_dai, PXA_SSP_CLK_EXT, clk, 1);
129	if (ret < 0)
130		return ret;
131
132	return 0;
133}
134
135static struct snd_soc_ops raumfeld_cs4270_ops = {
136	.startup = raumfeld_cs4270_startup,
137	.shutdown = raumfeld_cs4270_shutdown,
138	.hw_params = raumfeld_cs4270_hw_params,
139};
140
141static int raumfeld_analog_suspend(struct snd_soc_card *card)
142{
143	raumfeld_enable_audio(false);
144	return 0;
145}
146
147static int raumfeld_analog_resume(struct snd_soc_card *card)
148{
149	raumfeld_enable_audio(true);
150	return 0;
151}
152
153/* AK4104 */
154
155static int raumfeld_ak4104_hw_params(struct snd_pcm_substream *substream,
156				     struct snd_pcm_hw_params *params)
157{
158	struct snd_soc_pcm_runtime *rtd = substream->private_data;
159	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
160	int ret = 0, clk = 0;
161
162	switch (params_rate(params)) {
163	case 44100:
164		set_max9485_clk(MAX9485_MCLK_FREQ_112896);
165		clk = 11289600;
166		break;
167	case 48000:
168		set_max9485_clk(MAX9485_MCLK_FREQ_122880);
169		clk = 12288000;
170		break;
171	case 88200:
172		set_max9485_clk(MAX9485_MCLK_FREQ_225792);
173		clk = 22579200;
174		break;
175	case 96000:
176		set_max9485_clk(MAX9485_MCLK_FREQ_245760);
177		clk = 24576000;
178		break;
179	default:
180		return -EINVAL;
181	}
182
183	/* setup the CPU DAI */
184	ret = snd_soc_dai_set_pll(cpu_dai, 0, 0, 0, clk);
185	if (ret < 0)
186		return ret;
187
188	ret = snd_soc_dai_set_clkdiv(cpu_dai, PXA_SSP_DIV_SCR, 4);
189	if (ret < 0)
190		return ret;
191
192	ret = snd_soc_dai_set_sysclk(cpu_dai, PXA_SSP_CLK_EXT, clk, 1);
193	if (ret < 0)
194		return ret;
195
196	return 0;
197}
198
199static struct snd_soc_ops raumfeld_ak4104_ops = {
200	.hw_params = raumfeld_ak4104_hw_params,
201};
202
203#define DAI_LINK_CS4270		\
204{							\
205	.name		= "CS4270",			\
206	.stream_name	= "CS4270",			\
207	.cpu_dai_name	= "pxa-ssp-dai.0",		\
208	.platform_name	= "pxa-pcm-audio",		\
209	.codec_dai_name	= "cs4270-hifi",		\
210	.codec_name	= "cs4270.0-0048",	\
211	.dai_fmt	= SND_SOC_DAIFMT_I2S |		\
212			  SND_SOC_DAIFMT_NB_NF |        \
213			  SND_SOC_DAIFMT_CBS_CFS,       \
214	.ops		= &raumfeld_cs4270_ops,		\
215}
216
217#define DAI_LINK_AK4104		\
218{							\
219	.name		= "ak4104",			\
220	.stream_name	= "Playback",			\
221	.cpu_dai_name	= "pxa-ssp-dai.1",		\
222	.codec_dai_name	= "ak4104-hifi",		\
223	.platform_name	= "pxa-pcm-audio",		\
224	.dai_fmt	= SND_SOC_DAIFMT_I2S |		\
225			  SND_SOC_DAIFMT_NB_NF |	\
226			  SND_SOC_DAIFMT_CBS_CFS,       \
227	.ops		= &raumfeld_ak4104_ops,		\
228	.codec_name	= "spi0.0",			\
229}
230
231static struct snd_soc_dai_link snd_soc_raumfeld_connector_dai[] =
232{
233	DAI_LINK_CS4270,
234	DAI_LINK_AK4104,
235};
236
237static struct snd_soc_dai_link snd_soc_raumfeld_speaker_dai[] =
238{
239	DAI_LINK_CS4270,
240};
241
242static struct snd_soc_card snd_soc_raumfeld_connector = {
243	.name		= "Raumfeld Connector",
244	.owner		= THIS_MODULE,
245	.dai_link	= snd_soc_raumfeld_connector_dai,
246	.num_links	= ARRAY_SIZE(snd_soc_raumfeld_connector_dai),
247	.suspend_post	= raumfeld_analog_suspend,
248	.resume_pre	= raumfeld_analog_resume,
249};
250
251static struct snd_soc_card snd_soc_raumfeld_speaker = {
252	.name		= "Raumfeld Speaker",
253	.owner		= THIS_MODULE,
254	.dai_link	= snd_soc_raumfeld_speaker_dai,
255	.num_links	= ARRAY_SIZE(snd_soc_raumfeld_speaker_dai),
256	.suspend_post	= raumfeld_analog_suspend,
257	.resume_pre	= raumfeld_analog_resume,
258};
259
260static struct platform_device *raumfeld_audio_device;
261
262static int __init raumfeld_audio_init(void)
263{
264	int ret;
265
266	if (!machine_is_raumfeld_speaker() &&
267	    !machine_is_raumfeld_connector())
268		return 0;
269
270	max9486_client = i2c_new_device(i2c_get_adapter(0),
271					&max9486_hwmon_info);
272
273	if (!max9486_client)
274		return -ENOMEM;
275
276	set_max9485_clk(MAX9485_MCLK_FREQ_122880);
277
278	/* Register analog device */
279	raumfeld_audio_device = platform_device_alloc("soc-audio", 0);
280	if (!raumfeld_audio_device)
281		return -ENOMEM;
282
283	if (machine_is_raumfeld_speaker())
284		platform_set_drvdata(raumfeld_audio_device,
285				     &snd_soc_raumfeld_speaker);
286
287	if (machine_is_raumfeld_connector())
288		platform_set_drvdata(raumfeld_audio_device,
289				     &snd_soc_raumfeld_connector);
290
291	ret = platform_device_add(raumfeld_audio_device);
292	if (ret < 0) {
293		platform_device_put(raumfeld_audio_device);
294		return ret;
295	}
296
297	raumfeld_enable_audio(true);
298	return 0;
299}
300
301static void __exit raumfeld_audio_exit(void)
302{
303	raumfeld_enable_audio(false);
304
305	platform_device_unregister(raumfeld_audio_device);
306
307	i2c_unregister_device(max9486_client);
308
309	gpio_free(GPIO_MCLK_RESET);
310	gpio_free(GPIO_CODEC_RESET);
311	gpio_free(GPIO_SPDIF_RESET);
312}
313
314module_init(raumfeld_audio_init);
315module_exit(raumfeld_audio_exit);
316
317/* Module information */
318MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
319MODULE_DESCRIPTION("Raumfeld audio SoC");
320MODULE_LICENSE("GPL");