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
41 #include <linux/atmel-ssc.h>
42
43 #include <sound/core.h>
44 #include <sound/pcm.h>
45 #include <sound/pcm_params.h>
46 #include <sound/soc.h>
47
48 #include <asm/mach-types.h>
49 #include <mach/hardware.h>
50 #include <mach/gpio.h>
51
52 #include "../codecs/wm8731.h"
53 #include "atmel-pcm.h"
54 #include "atmel_ssc_dai.h"
55
56 #define MCLK_RATE 12000000
57
58 /*
59 * As shipped the board does not have inputs. However, it is relatively
60 * straightforward to modify the board to hook them up so support is left
61 * in the driver.
62 */
63 #undef ENABLE_MIC_INPUT
64
65 static struct clk *mclk;
66
at91sam9g20ek_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)67 static int at91sam9g20ek_hw_params(struct snd_pcm_substream *substream,
68 struct snd_pcm_hw_params *params)
69 {
70 struct snd_soc_pcm_runtime *rtd = substream->private_data;
71 struct snd_soc_dai *codec_dai = rtd->codec_dai;
72 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
73 int ret;
74
75 /* set codec DAI configuration */
76 ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
77 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
78 if (ret < 0)
79 return ret;
80
81 /* set cpu DAI configuration */
82 ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
83 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
84 if (ret < 0)
85 return ret;
86
87 return 0;
88 }
89
90 static struct snd_soc_ops at91sam9g20ek_ops = {
91 .hw_params = at91sam9g20ek_hw_params,
92 };
93
at91sam9g20ek_set_bias_level(struct snd_soc_card * card,enum snd_soc_bias_level level)94 static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card,
95 enum snd_soc_bias_level level)
96 {
97 static int mclk_on;
98 int ret = 0;
99
100 switch (level) {
101 case SND_SOC_BIAS_ON:
102 case SND_SOC_BIAS_PREPARE:
103 if (!mclk_on)
104 ret = clk_enable(mclk);
105 if (ret == 0)
106 mclk_on = 1;
107 break;
108
109 case SND_SOC_BIAS_OFF:
110 case SND_SOC_BIAS_STANDBY:
111 if (mclk_on)
112 clk_disable(mclk);
113 mclk_on = 0;
114 break;
115 }
116
117 return ret;
118 }
119
120 static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
121 SND_SOC_DAPM_MIC("Int Mic", NULL),
122 SND_SOC_DAPM_SPK("Ext Spk", NULL),
123 };
124
125 static const struct snd_soc_dapm_route intercon[] = {
126
127 /* speaker connected to LHPOUT */
128 {"Ext Spk", NULL, "LHPOUT"},
129
130 /* mic is connected to Mic Jack, with WM8731 Mic Bias */
131 {"MICIN", NULL, "Mic Bias"},
132 {"Mic Bias", NULL, "Int Mic"},
133 };
134
135 /*
136 * Logic for a wm8731 as connected on a at91sam9g20ek board.
137 */
at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime * rtd)138 static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd)
139 {
140 struct snd_soc_codec *codec = rtd->codec;
141 struct snd_soc_dai *codec_dai = rtd->codec_dai;
142 struct snd_soc_dapm_context *dapm = &codec->dapm;
143 int ret;
144
145 printk(KERN_DEBUG
146 "at91sam9g20ek_wm8731 "
147 ": at91sam9g20ek_wm8731_init() called\n");
148
149 ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
150 MCLK_RATE, SND_SOC_CLOCK_IN);
151 if (ret < 0) {
152 printk(KERN_ERR "Failed to set WM8731 SYSCLK: %d\n", ret);
153 return ret;
154 }
155
156 /* Add specific widgets */
157 snd_soc_dapm_new_controls(dapm, at91sam9g20ek_dapm_widgets,
158 ARRAY_SIZE(at91sam9g20ek_dapm_widgets));
159 /* Set up specific audio path interconnects */
160 snd_soc_dapm_add_routes(dapm, intercon, ARRAY_SIZE(intercon));
161
162 /* not connected */
163 snd_soc_dapm_nc_pin(dapm, "RLINEIN");
164 snd_soc_dapm_nc_pin(dapm, "LLINEIN");
165
166 #ifdef ENABLE_MIC_INPUT
167 snd_soc_dapm_enable_pin(dapm, "Int Mic");
168 #else
169 snd_soc_dapm_nc_pin(dapm, "Int Mic");
170 #endif
171
172 /* always connected */
173 snd_soc_dapm_enable_pin(dapm, "Ext Spk");
174
175 snd_soc_dapm_sync(dapm);
176
177 return 0;
178 }
179
180 static struct snd_soc_dai_link at91sam9g20ek_dai = {
181 .name = "WM8731",
182 .stream_name = "WM8731 PCM",
183 .cpu_dai_name = "atmel-ssc-dai.0",
184 .codec_dai_name = "wm8731-hifi",
185 .init = at91sam9g20ek_wm8731_init,
186 .platform_name = "atmel-pcm-audio",
187 .codec_name = "wm8731-codec.0-001b",
188 .ops = &at91sam9g20ek_ops,
189 };
190
191 static struct snd_soc_card snd_soc_at91sam9g20ek = {
192 .name = "AT91SAMG20-EK",
193 .dai_link = &at91sam9g20ek_dai,
194 .num_links = 1,
195 .set_bias_level = at91sam9g20ek_set_bias_level,
196 };
197
198 static struct platform_device *at91sam9g20ek_snd_device;
199
at91sam9g20ek_init(void)200 static int __init at91sam9g20ek_init(void)
201 {
202 struct clk *pllb;
203 int ret;
204
205 if (!(machine_is_at91sam9g20ek() || machine_is_at91sam9g20ek_2mmc()))
206 return -ENODEV;
207
208 ret = atmel_ssc_set_audio(0);
209 if (ret != 0) {
210 pr_err("Failed to set SSC 0 for audio: %d\n", ret);
211 return ret;
212 }
213
214 /*
215 * Codec MCLK is supplied by PCK0 - set it up.
216 */
217 mclk = clk_get(NULL, "pck0");
218 if (IS_ERR(mclk)) {
219 printk(KERN_ERR "ASoC: Failed to get MCLK\n");
220 ret = PTR_ERR(mclk);
221 goto err;
222 }
223
224 pllb = clk_get(NULL, "pllb");
225 if (IS_ERR(pllb)) {
226 printk(KERN_ERR "ASoC: Failed to get PLLB\n");
227 ret = PTR_ERR(pllb);
228 goto err_mclk;
229 }
230 ret = clk_set_parent(mclk, pllb);
231 clk_put(pllb);
232 if (ret != 0) {
233 printk(KERN_ERR "ASoC: Failed to set MCLK parent\n");
234 goto err_mclk;
235 }
236
237 clk_set_rate(mclk, MCLK_RATE);
238
239 at91sam9g20ek_snd_device = platform_device_alloc("soc-audio", -1);
240 if (!at91sam9g20ek_snd_device) {
241 printk(KERN_ERR "ASoC: Platform device allocation failed\n");
242 ret = -ENOMEM;
243 goto err_mclk;
244 }
245
246 platform_set_drvdata(at91sam9g20ek_snd_device,
247 &snd_soc_at91sam9g20ek);
248
249 ret = platform_device_add(at91sam9g20ek_snd_device);
250 if (ret) {
251 printk(KERN_ERR "ASoC: Platform device allocation failed\n");
252 goto err_device_add;
253 }
254
255 return ret;
256
257 err_device_add:
258 platform_device_put(at91sam9g20ek_snd_device);
259 err_mclk:
260 clk_put(mclk);
261 mclk = NULL;
262 err:
263 return ret;
264 }
265
at91sam9g20ek_exit(void)266 static void __exit at91sam9g20ek_exit(void)
267 {
268 platform_device_unregister(at91sam9g20ek_snd_device);
269 at91sam9g20ek_snd_device = NULL;
270 clk_put(mclk);
271 mclk = NULL;
272 }
273
274 module_init(at91sam9g20ek_init);
275 module_exit(at91sam9g20ek_exit);
276
277 /* Module information */
278 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
279 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
280 MODULE_LICENSE("GPL");
281