2 * sam9g20_wm8731 -- SoC audio for AT91SAM9G20-based
3 * ATMEL AT91SAM9G20ek board.
5 * Copyright (C) 2005 SAN People
6 * Copyright (C) 2008 Atmel
8 * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
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.
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.
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.
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
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>
41 #include <linux/atmel-ssc.h>
43 #include <sound/core.h>
44 #include <sound/pcm.h>
45 #include <sound/pcm_params.h>
46 #include <sound/soc.h>
47 #include <sound/soc-dapm.h>
49 #include <asm/mach-types.h>
50 #include <mach/hardware.h>
51 #include <mach/gpio.h>
53 #include "../codecs/wm8731.h"
54 #include "atmel-pcm.h"
55 #include "atmel_ssc_dai.h"
57 #define MCLK_RATE 12000000
60 * As shipped the board does not have inputs. However, it is relatively
61 * straightforward to modify the board to hook them up so support is left
64 #undef ENABLE_MIC_INPUT
66 static struct clk *mclk;
68 static int at91sam9g20ek_hw_params(struct snd_pcm_substream *substream,
69 struct snd_pcm_hw_params *params)
71 struct snd_soc_pcm_runtime *rtd = substream->private_data;
72 struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
73 struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
76 /* set codec DAI configuration */
77 ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
78 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
82 /* set cpu DAI configuration */
83 ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
84 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
91 static struct snd_soc_ops at91sam9g20ek_ops = {
92 .hw_params = at91sam9g20ek_hw_params,
95 static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card,
96 enum snd_soc_bias_level level)
102 case SND_SOC_BIAS_ON:
103 case SND_SOC_BIAS_PREPARE:
105 ret = clk_enable(mclk);
110 case SND_SOC_BIAS_OFF:
111 case SND_SOC_BIAS_STANDBY:
121 static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
122 SND_SOC_DAPM_MIC("Int Mic", NULL),
123 SND_SOC_DAPM_SPK("Ext Spk", NULL),
126 static const struct snd_soc_dapm_route intercon[] = {
128 /* speaker connected to LHPOUT */
129 {"Ext Spk", NULL, "LHPOUT"},
131 /* mic is connected to Mic Jack, with WM8731 Mic Bias */
132 {"MICIN", NULL, "Mic Bias"},
133 {"Mic Bias", NULL, "Int Mic"},
137 * Logic for a wm8731 as connected on a at91sam9g20ek board.
139 static int at91sam9g20ek_wm8731_init(struct snd_soc_codec *codec)
141 struct snd_soc_dai *codec_dai = &codec->dai[0];
145 "at91sam9g20ek_wm8731 "
146 ": at91sam9g20ek_wm8731_init() called\n");
148 ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK,
149 MCLK_RATE, SND_SOC_CLOCK_IN);
151 printk(KERN_ERR "Failed to set WM8731 SYSCLK: %d\n", ret);
155 /* Add specific widgets */
156 snd_soc_dapm_new_controls(codec, at91sam9g20ek_dapm_widgets,
157 ARRAY_SIZE(at91sam9g20ek_dapm_widgets));
158 /* Set up specific audio path interconnects */
159 snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
162 snd_soc_dapm_nc_pin(codec, "RLINEIN");
163 snd_soc_dapm_nc_pin(codec, "LLINEIN");
165 #ifdef ENABLE_MIC_INPUT
166 snd_soc_dapm_enable_pin(codec, "Int Mic");
168 snd_soc_dapm_nc_pin(codec, "Int Mic");
171 /* always connected */
172 snd_soc_dapm_enable_pin(codec, "Ext Spk");
174 snd_soc_dapm_sync(codec);
179 static struct snd_soc_dai_link at91sam9g20ek_dai = {
181 .stream_name = "WM8731 PCM",
182 .cpu_dai = &atmel_ssc_dai[0],
183 .codec_dai = &wm8731_dai,
184 .init = at91sam9g20ek_wm8731_init,
185 .ops = &at91sam9g20ek_ops,
188 static struct snd_soc_card snd_soc_at91sam9g20ek = {
189 .name = "AT91SAMG20-EK",
190 .platform = &atmel_soc_platform,
191 .dai_link = &at91sam9g20ek_dai,
193 .set_bias_level = at91sam9g20ek_set_bias_level,
197 * FIXME: This is a temporary bodge to avoid cross-tree merge issues.
198 * New drivers should register the wm8731 I2C device in the machine
199 * setup code (under arch/arm for ARM systems).
201 static int wm8731_i2c_register(void)
203 struct i2c_board_info info;
204 struct i2c_adapter *adapter;
205 struct i2c_client *client;
207 memset(&info, 0, sizeof(struct i2c_board_info));
209 strlcpy(info.type, "wm8731", I2C_NAME_SIZE);
211 adapter = i2c_get_adapter(0);
213 printk(KERN_ERR "can't get i2c adapter 0\n");
217 client = i2c_new_device(adapter, &info);
218 i2c_put_adapter(adapter);
220 printk(KERN_ERR "can't add i2c device at 0x%x\n",
221 (unsigned int)info.addr);
228 static struct snd_soc_device at91sam9g20ek_snd_devdata = {
229 .card = &snd_soc_at91sam9g20ek,
230 .codec_dev = &soc_codec_dev_wm8731,
233 static struct platform_device *at91sam9g20ek_snd_device;
235 static int __init at91sam9g20ek_init(void)
237 struct atmel_ssc_info *ssc_p = at91sam9g20ek_dai.cpu_dai->private_data;
238 struct ssc_device *ssc = NULL;
242 if (!machine_is_at91sam9g20ek())
246 * Codec MCLK is supplied by PCK0 - set it up.
248 mclk = clk_get(NULL, "pck0");
250 printk(KERN_ERR "ASoC: Failed to get MCLK\n");
255 pllb = clk_get(NULL, "pllb");
257 printk(KERN_ERR "ASoC: Failed to get PLLB\n");
261 ret = clk_set_parent(mclk, pllb);
264 printk(KERN_ERR "ASoC: Failed to set MCLK parent\n");
268 clk_set_rate(mclk, MCLK_RATE);
273 ssc = ssc_request(0);
275 printk(KERN_ERR "ASoC: Failed to request SSC 0\n");
282 ret = wm8731_i2c_register();
286 at91sam9g20ek_snd_device = platform_device_alloc("soc-audio", -1);
287 if (!at91sam9g20ek_snd_device) {
288 printk(KERN_ERR "ASoC: Platform device allocation failed\n");
292 platform_set_drvdata(at91sam9g20ek_snd_device,
293 &at91sam9g20ek_snd_devdata);
294 at91sam9g20ek_snd_devdata.dev = &at91sam9g20ek_snd_device->dev;
296 ret = platform_device_add(at91sam9g20ek_snd_device);
298 printk(KERN_ERR "ASoC: Platform device allocation failed\n");
299 platform_device_put(at91sam9g20ek_snd_device);
314 static void __exit at91sam9g20ek_exit(void)
316 struct atmel_ssc_info *ssc_p = at91sam9g20ek_dai.cpu_dai->private_data;
317 struct ssc_device *ssc;
326 platform_device_unregister(at91sam9g20ek_snd_device);
327 at91sam9g20ek_snd_device = NULL;
332 module_init(at91sam9g20ek_init);
333 module_exit(at91sam9g20ek_exit);
335 /* Module information */
336 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
337 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
338 MODULE_LICENSE("GPL");