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>
51 #include "../codecs/wm8731.h"
52 #include "atmel-pcm.h"
53 #include "atmel_ssc_dai.h"
55 #define MCLK_RATE 12000000
58 * As shipped the board does not have inputs. However, it is relatively
59 * straightforward to modify the board to hook them up so support is left
62 #undef ENABLE_MIC_INPUT
64 static struct clk
*mclk
;
66 static int at91sam9g20ek_set_bias_level(struct snd_soc_card
*card
,
67 struct snd_soc_dapm_context
*dapm
,
68 enum snd_soc_bias_level level
)
75 case SND_SOC_BIAS_PREPARE
:
77 ret
= clk_enable(mclk
);
82 case SND_SOC_BIAS_OFF
:
83 case SND_SOC_BIAS_STANDBY
:
93 static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets
[] = {
94 SND_SOC_DAPM_MIC("Int Mic", NULL
),
95 SND_SOC_DAPM_SPK("Ext Spk", NULL
),
98 static const struct snd_soc_dapm_route intercon
[] = {
100 /* speaker connected to LHPOUT */
101 {"Ext Spk", NULL
, "LHPOUT"},
103 /* mic is connected to Mic Jack, with WM8731 Mic Bias */
104 {"MICIN", NULL
, "Mic Bias"},
105 {"Mic Bias", NULL
, "Int Mic"},
109 * Logic for a wm8731 as connected on a at91sam9g20ek board.
111 static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime
*rtd
)
113 struct snd_soc_codec
*codec
= rtd
->codec
;
114 struct snd_soc_dai
*codec_dai
= rtd
->codec_dai
;
115 struct snd_soc_dapm_context
*dapm
= &codec
->dapm
;
119 "at91sam9g20ek_wm8731 "
120 ": at91sam9g20ek_wm8731_init() called\n");
122 ret
= snd_soc_dai_set_sysclk(codec_dai
, WM8731_SYSCLK_MCLK
,
123 MCLK_RATE
, SND_SOC_CLOCK_IN
);
125 printk(KERN_ERR
"Failed to set WM8731 SYSCLK: %d\n", ret
);
130 snd_soc_dapm_nc_pin(dapm
, "RLINEIN");
131 snd_soc_dapm_nc_pin(dapm
, "LLINEIN");
133 #ifndef ENABLE_MIC_INPUT
134 snd_soc_dapm_nc_pin(&rtd
->card
->dapm
, "Int Mic");
140 static struct snd_soc_dai_link at91sam9g20ek_dai
= {
142 .stream_name
= "WM8731 PCM",
143 .cpu_dai_name
= "at91rm9200_ssc.0",
144 .codec_dai_name
= "wm8731-hifi",
145 .init
= at91sam9g20ek_wm8731_init
,
146 .platform_name
= "at91rm9200_ssc.0",
147 .codec_name
= "wm8731.0-001b",
148 .dai_fmt
= SND_SOC_DAIFMT_I2S
| SND_SOC_DAIFMT_NB_NF
|
149 SND_SOC_DAIFMT_CBM_CFM
,
152 static struct snd_soc_card snd_soc_at91sam9g20ek
= {
153 .name
= "AT91SAMG20-EK",
154 .owner
= THIS_MODULE
,
155 .dai_link
= &at91sam9g20ek_dai
,
157 .set_bias_level
= at91sam9g20ek_set_bias_level
,
159 .dapm_widgets
= at91sam9g20ek_dapm_widgets
,
160 .num_dapm_widgets
= ARRAY_SIZE(at91sam9g20ek_dapm_widgets
),
161 .dapm_routes
= intercon
,
162 .num_dapm_routes
= ARRAY_SIZE(intercon
),
165 static int at91sam9g20ek_audio_probe(struct platform_device
*pdev
)
167 struct device_node
*np
= pdev
->dev
.of_node
;
168 struct device_node
*codec_np
, *cpu_np
;
170 struct snd_soc_card
*card
= &snd_soc_at91sam9g20ek
;
174 if (!(machine_is_at91sam9g20ek() ||
175 machine_is_at91sam9g20ek_2mmc()))
179 ret
= atmel_ssc_set_audio(0);
181 dev_err(&pdev
->dev
, "ssc channel is not valid\n");
186 * Codec MCLK is supplied by PCK0 - set it up.
188 mclk
= clk_get(NULL
, "pck0");
190 printk(KERN_ERR
"ASoC: Failed to get MCLK\n");
195 pllb
= clk_get(NULL
, "pllb");
197 printk(KERN_ERR
"ASoC: Failed to get PLLB\n");
201 ret
= clk_set_parent(mclk
, pllb
);
204 printk(KERN_ERR
"ASoC: Failed to set MCLK parent\n");
208 clk_set_rate(mclk
, MCLK_RATE
);
210 card
->dev
= &pdev
->dev
;
212 /* Parse device node info */
214 ret
= snd_soc_of_parse_card_name(card
, "atmel,model");
218 ret
= snd_soc_of_parse_audio_routing(card
,
219 "atmel,audio-routing");
223 /* Parse codec info */
224 at91sam9g20ek_dai
.codec_name
= NULL
;
225 codec_np
= of_parse_phandle(np
, "atmel,audio-codec", 0);
227 dev_err(&pdev
->dev
, "codec info missing\n");
230 at91sam9g20ek_dai
.codec_of_node
= codec_np
;
232 /* Parse dai and platform info */
233 at91sam9g20ek_dai
.cpu_dai_name
= NULL
;
234 at91sam9g20ek_dai
.platform_name
= NULL
;
235 cpu_np
= of_parse_phandle(np
, "atmel,ssc-controller", 0);
237 dev_err(&pdev
->dev
, "dai and pcm info missing\n");
240 at91sam9g20ek_dai
.cpu_of_node
= cpu_np
;
241 at91sam9g20ek_dai
.platform_of_node
= cpu_np
;
243 of_node_put(codec_np
);
247 ret
= snd_soc_register_card(card
);
249 printk(KERN_ERR
"ASoC: snd_soc_register_card() failed\n");
258 atmel_ssc_put_audio(0);
262 static int at91sam9g20ek_audio_remove(struct platform_device
*pdev
)
264 struct snd_soc_card
*card
= platform_get_drvdata(pdev
);
268 snd_soc_unregister_card(card
);
269 atmel_ssc_put_audio(0);
275 static const struct of_device_id at91sam9g20ek_wm8731_dt_ids
[] = {
276 { .compatible
= "atmel,at91sam9g20ek-wm8731-audio", },
279 MODULE_DEVICE_TABLE(of
, at91sam9g20ek_wm8731_dt_ids
);
282 static struct platform_driver at91sam9g20ek_audio_driver
= {
284 .name
= "at91sam9g20ek-audio",
285 .of_match_table
= of_match_ptr(at91sam9g20ek_wm8731_dt_ids
),
287 .probe
= at91sam9g20ek_audio_probe
,
288 .remove
= at91sam9g20ek_audio_remove
,
291 module_platform_driver(at91sam9g20ek_audio_driver
);
293 /* Module information */
294 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
295 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
296 MODULE_ALIAS("platform:at91sam9g20ek-audio");
297 MODULE_LICENSE("GPL");