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>
42 #include <linux/atmel-ssc.h>
44 #include <sound/core.h>
45 #include <sound/pcm.h>
46 #include <sound/pcm_params.h>
47 #include <sound/soc.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->codec_dai;
73 struct snd_soc_dai *cpu_dai = rtd->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 struct snd_soc_dapm_context *dapm,
97 enum snd_soc_bias_level level)
103 case SND_SOC_BIAS_ON:
104 case SND_SOC_BIAS_PREPARE:
106 ret = clk_enable(mclk);
111 case SND_SOC_BIAS_OFF:
112 case SND_SOC_BIAS_STANDBY:
122 static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
123 SND_SOC_DAPM_MIC("Int Mic", NULL),
124 SND_SOC_DAPM_SPK("Ext Spk", NULL),
127 static const struct snd_soc_dapm_route intercon[] = {
129 /* speaker connected to LHPOUT */
130 {"Ext Spk", NULL, "LHPOUT"},
132 /* mic is connected to Mic Jack, with WM8731 Mic Bias */
133 {"MICIN", NULL, "Mic Bias"},
134 {"Mic Bias", NULL, "Int Mic"},
138 * Logic for a wm8731 as connected on a at91sam9g20ek board.
140 static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd)
142 struct snd_soc_codec *codec = rtd->codec;
143 struct snd_soc_dai *codec_dai = rtd->codec_dai;
144 struct snd_soc_dapm_context *dapm = &codec->dapm;
148 "at91sam9g20ek_wm8731 "
149 ": at91sam9g20ek_wm8731_init() called\n");
151 ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK,
152 MCLK_RATE, SND_SOC_CLOCK_IN);
154 printk(KERN_ERR "Failed to set WM8731 SYSCLK: %d\n", ret);
159 snd_soc_dapm_nc_pin(dapm, "RLINEIN");
160 snd_soc_dapm_nc_pin(dapm, "LLINEIN");
162 #ifndef ENABLE_MIC_INPUT
163 snd_soc_dapm_nc_pin(&rtd->card->dapm, "Int Mic");
169 static struct snd_soc_dai_link at91sam9g20ek_dai = {
171 .stream_name = "WM8731 PCM",
172 .cpu_dai_name = "at91rm9200_ssc.0",
173 .codec_dai_name = "wm8731-hifi",
174 .init = at91sam9g20ek_wm8731_init,
175 .platform_name = "at91rm9200_ssc.0",
176 .codec_name = "wm8731.0-001b",
177 .ops = &at91sam9g20ek_ops,
180 static struct snd_soc_card snd_soc_at91sam9g20ek = {
181 .name = "AT91SAMG20-EK",
182 .owner = THIS_MODULE,
183 .dai_link = &at91sam9g20ek_dai,
185 .set_bias_level = at91sam9g20ek_set_bias_level,
187 .dapm_widgets = at91sam9g20ek_dapm_widgets,
188 .num_dapm_widgets = ARRAY_SIZE(at91sam9g20ek_dapm_widgets),
189 .dapm_routes = intercon,
190 .num_dapm_routes = ARRAY_SIZE(intercon),
193 static int at91sam9g20ek_audio_probe(struct platform_device *pdev)
195 struct device_node *np = pdev->dev.of_node;
196 struct device_node *codec_np, *cpu_np;
198 struct snd_soc_card *card = &snd_soc_at91sam9g20ek;
202 if (!(machine_is_at91sam9g20ek() ||
203 machine_is_at91sam9g20ek_2mmc()))
207 ret = atmel_ssc_set_audio(0);
209 dev_err(&pdev->dev, "ssc channel is not valid\n");
214 * Codec MCLK is supplied by PCK0 - set it up.
216 mclk = clk_get(NULL, "pck0");
218 printk(KERN_ERR "ASoC: Failed to get MCLK\n");
223 pllb = clk_get(NULL, "pllb");
225 printk(KERN_ERR "ASoC: Failed to get PLLB\n");
229 ret = clk_set_parent(mclk, pllb);
232 printk(KERN_ERR "ASoC: Failed to set MCLK parent\n");
236 clk_set_rate(mclk, MCLK_RATE);
238 card->dev = &pdev->dev;
240 /* Parse device node info */
242 ret = snd_soc_of_parse_card_name(card, "atmel,model");
246 ret = snd_soc_of_parse_audio_routing(card,
247 "atmel,audio-routing");
251 /* Parse codec info */
252 at91sam9g20ek_dai.codec_name = NULL;
253 codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
255 dev_err(&pdev->dev, "codec info missing\n");
258 at91sam9g20ek_dai.codec_of_node = codec_np;
260 /* Parse dai and platform info */
261 at91sam9g20ek_dai.cpu_dai_name = NULL;
262 at91sam9g20ek_dai.platform_name = NULL;
263 cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
265 dev_err(&pdev->dev, "dai and pcm info missing\n");
268 at91sam9g20ek_dai.cpu_of_node = cpu_np;
269 at91sam9g20ek_dai.platform_of_node = cpu_np;
271 of_node_put(codec_np);
275 ret = snd_soc_register_card(card);
277 printk(KERN_ERR "ASoC: snd_soc_register_card() failed\n");
286 atmel_ssc_put_audio(0);
290 static int at91sam9g20ek_audio_remove(struct platform_device *pdev)
292 struct snd_soc_card *card = platform_get_drvdata(pdev);
296 snd_soc_unregister_card(card);
297 atmel_ssc_put_audio(0);
303 static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = {
304 { .compatible = "atmel,at91sam9g20ek-wm8731-audio", },
307 MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids);
310 static struct platform_driver at91sam9g20ek_audio_driver = {
312 .name = "at91sam9g20ek-audio",
313 .owner = THIS_MODULE,
314 .of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids),
316 .probe = at91sam9g20ek_audio_probe,
317 .remove = at91sam9g20ek_audio_remove,
320 module_platform_driver(at91sam9g20ek_audio_driver);
322 /* Module information */
323 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
324 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
325 MODULE_ALIAS("platform:at91sam9g20ek-audio");
326 MODULE_LICENSE("GPL");