This patch contains scripts to decrease the time taken for
[kvmfornfv.git] / kernel / sound / soc / atmel / sam9g20_wm8731.c
1 /*
2  * sam9g20_wm8731  --  SoC audio for AT91SAM9G20-based
3  *                      ATMEL AT91SAM9G20ek board.
4  *
5  *  Copyright (C) 2005 SAN People
6  *  Copyright (C) 2008 Atmel
7  *
8  * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
9  *
10  * Based on ati_b1_wm8731.c by:
11  * Frank Mandarino <fmandarino@endrelia.com>
12  * Copyright 2006 Endrelia Technologies Inc.
13  * Based on corgi.c by:
14  * Copyright 2005 Wolfson Microelectronics PLC.
15  * Copyright 2005 Openedhand Ltd.
16  *
17  * This program is free software; you can redistribute it and/or modify
18  * it under the terms of the GNU General Public License as published by
19  * the Free Software Foundation; either version 2 of the License, or
20  * (at your option) any later version.
21  *
22  * This program is distributed in the hope that it will be useful,
23  * but WITHOUT ANY WARRANTY; without even the implied warranty of
24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
25  * GNU General Public License for more details.
26  *
27  * You should have received a copy of the GNU General Public License
28  * along with this program; if not, write to the Free Software
29  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
30  */
31
32 #include <linux/module.h>
33 #include <linux/moduleparam.h>
34 #include <linux/kernel.h>
35 #include <linux/clk.h>
36 #include <linux/timer.h>
37 #include <linux/interrupt.h>
38 #include <linux/platform_device.h>
39 #include <linux/i2c.h>
40 #include <linux/of.h>
41
42 #include <linux/atmel-ssc.h>
43
44 #include <sound/core.h>
45 #include <sound/pcm.h>
46 #include <sound/pcm_params.h>
47 #include <sound/soc.h>
48
49 #include "../codecs/wm8731.h"
50 #include "atmel-pcm.h"
51 #include "atmel_ssc_dai.h"
52
53 #define MCLK_RATE 12000000
54
55 /*
56  * As shipped the board does not have inputs.  However, it is relatively
57  * straightforward to modify the board to hook them up so support is left
58  * in the driver.
59  */
60 #undef ENABLE_MIC_INPUT
61
62 static struct clk *mclk;
63
64 static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card,
65                                         struct snd_soc_dapm_context *dapm,
66                                         enum snd_soc_bias_level level)
67 {
68         static int mclk_on;
69         int ret = 0;
70
71         switch (level) {
72         case SND_SOC_BIAS_ON:
73         case SND_SOC_BIAS_PREPARE:
74                 if (!mclk_on)
75                         ret = clk_enable(mclk);
76                 if (ret == 0)
77                         mclk_on = 1;
78                 break;
79
80         case SND_SOC_BIAS_OFF:
81         case SND_SOC_BIAS_STANDBY:
82                 if (mclk_on)
83                         clk_disable(mclk);
84                 mclk_on = 0;
85                 break;
86         }
87
88         return ret;
89 }
90
91 static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
92         SND_SOC_DAPM_MIC("Int Mic", NULL),
93         SND_SOC_DAPM_SPK("Ext Spk", NULL),
94 };
95
96 static const struct snd_soc_dapm_route intercon[] = {
97
98         /* speaker connected to LHPOUT/RHPOUT */
99         {"Ext Spk", NULL, "LHPOUT"},
100         {"Ext Spk", NULL, "RHPOUT"},
101
102         /* mic is connected to Mic Jack, with WM8731 Mic Bias */
103         {"MICIN", NULL, "Mic Bias"},
104         {"Mic Bias", NULL, "Int Mic"},
105 };
106
107 /*
108  * Logic for a wm8731 as connected on a at91sam9g20ek board.
109  */
110 static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd)
111 {
112         struct snd_soc_dai *codec_dai = rtd->codec_dai;
113         int ret;
114
115         printk(KERN_DEBUG
116                         "at91sam9g20ek_wm8731 "
117                         ": at91sam9g20ek_wm8731_init() called\n");
118
119         ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK,
120                 MCLK_RATE, SND_SOC_CLOCK_IN);
121         if (ret < 0) {
122                 printk(KERN_ERR "Failed to set WM8731 SYSCLK: %d\n", ret);
123                 return ret;
124         }
125
126 #ifndef ENABLE_MIC_INPUT
127         snd_soc_dapm_nc_pin(&rtd->card->dapm, "Int Mic");
128 #endif
129
130         return 0;
131 }
132
133 static struct snd_soc_dai_link at91sam9g20ek_dai = {
134         .name = "WM8731",
135         .stream_name = "WM8731 PCM",
136         .cpu_dai_name = "at91rm9200_ssc.0",
137         .codec_dai_name = "wm8731-hifi",
138         .init = at91sam9g20ek_wm8731_init,
139         .platform_name = "at91rm9200_ssc.0",
140         .codec_name = "wm8731.0-001b",
141         .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
142                    SND_SOC_DAIFMT_CBM_CFM,
143 };
144
145 static struct snd_soc_card snd_soc_at91sam9g20ek = {
146         .name = "AT91SAMG20-EK",
147         .owner = THIS_MODULE,
148         .dai_link = &at91sam9g20ek_dai,
149         .num_links = 1,
150         .set_bias_level = at91sam9g20ek_set_bias_level,
151
152         .dapm_widgets = at91sam9g20ek_dapm_widgets,
153         .num_dapm_widgets = ARRAY_SIZE(at91sam9g20ek_dapm_widgets),
154         .dapm_routes = intercon,
155         .num_dapm_routes = ARRAY_SIZE(intercon),
156         .fully_routed = true,
157 };
158
159 static int at91sam9g20ek_audio_probe(struct platform_device *pdev)
160 {
161         struct device_node *np = pdev->dev.of_node;
162         struct device_node *codec_np, *cpu_np;
163         struct clk *pllb;
164         struct snd_soc_card *card = &snd_soc_at91sam9g20ek;
165         int ret;
166
167         if (!np) {
168                 return -ENODEV;
169         }
170
171         ret = atmel_ssc_set_audio(0);
172         if (ret) {
173                 dev_err(&pdev->dev, "ssc channel is not valid\n");
174                 return -EINVAL;
175         }
176
177         /*
178          * Codec MCLK is supplied by PCK0 - set it up.
179          */
180         mclk = clk_get(NULL, "pck0");
181         if (IS_ERR(mclk)) {
182                 printk(KERN_ERR "ASoC: Failed to get MCLK\n");
183                 ret = PTR_ERR(mclk);
184                 goto err;
185         }
186
187         pllb = clk_get(NULL, "pllb");
188         if (IS_ERR(pllb)) {
189                 printk(KERN_ERR "ASoC: Failed to get PLLB\n");
190                 ret = PTR_ERR(pllb);
191                 goto err_mclk;
192         }
193         ret = clk_set_parent(mclk, pllb);
194         clk_put(pllb);
195         if (ret != 0) {
196                 printk(KERN_ERR "ASoC: Failed to set MCLK parent\n");
197                 goto err_mclk;
198         }
199
200         clk_set_rate(mclk, MCLK_RATE);
201
202         card->dev = &pdev->dev;
203
204         /* Parse device node info */
205         ret = snd_soc_of_parse_card_name(card, "atmel,model");
206         if (ret)
207                 goto err;
208
209         ret = snd_soc_of_parse_audio_routing(card,
210                 "atmel,audio-routing");
211         if (ret)
212                 goto err;
213
214         /* Parse codec info */
215         at91sam9g20ek_dai.codec_name = NULL;
216         codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
217         if (!codec_np) {
218                 dev_err(&pdev->dev, "codec info missing\n");
219                 return -EINVAL;
220         }
221         at91sam9g20ek_dai.codec_of_node = codec_np;
222
223         /* Parse dai and platform info */
224         at91sam9g20ek_dai.cpu_dai_name = NULL;
225         at91sam9g20ek_dai.platform_name = NULL;
226         cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
227         if (!cpu_np) {
228                 dev_err(&pdev->dev, "dai and pcm info missing\n");
229                 return -EINVAL;
230         }
231         at91sam9g20ek_dai.cpu_of_node = cpu_np;
232         at91sam9g20ek_dai.platform_of_node = cpu_np;
233
234         of_node_put(codec_np);
235         of_node_put(cpu_np);
236
237         ret = snd_soc_register_card(card);
238         if (ret) {
239                 printk(KERN_ERR "ASoC: snd_soc_register_card() failed\n");
240         }
241
242         return ret;
243
244 err_mclk:
245         clk_put(mclk);
246         mclk = NULL;
247 err:
248         atmel_ssc_put_audio(0);
249         return ret;
250 }
251
252 static int at91sam9g20ek_audio_remove(struct platform_device *pdev)
253 {
254         struct snd_soc_card *card = platform_get_drvdata(pdev);
255
256         clk_disable(mclk);
257         mclk = NULL;
258         snd_soc_unregister_card(card);
259         atmel_ssc_put_audio(0);
260
261         return 0;
262 }
263
264 #ifdef CONFIG_OF
265 static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = {
266         { .compatible = "atmel,at91sam9g20ek-wm8731-audio", },
267         { }
268 };
269 MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids);
270 #endif
271
272 static struct platform_driver at91sam9g20ek_audio_driver = {
273         .driver = {
274                 .name   = "at91sam9g20ek-audio",
275                 .of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids),
276         },
277         .probe  = at91sam9g20ek_audio_probe,
278         .remove = at91sam9g20ek_audio_remove,
279 };
280
281 module_platform_driver(at91sam9g20ek_audio_driver);
282
283 /* Module information */
284 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
285 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
286 MODULE_ALIAS("platform:at91sam9g20ek-audio");
287 MODULE_LICENSE("GPL");