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
at91sam9g20ek_set_bias_level(struct snd_soc_card * card,struct snd_soc_dapm_context * dapm,enum snd_soc_bias_level level)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 */
at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime * rtd)110 static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd)
111 {
112 struct snd_soc_dai *codec_dai = rtd->codec_dai;
113 struct device *dev = rtd->dev;
114 int ret;
115
116 dev_dbg(dev, "%s called\n", __func__);
117
118 ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK,
119 MCLK_RATE, SND_SOC_CLOCK_IN);
120 if (ret < 0) {
121 dev_err(dev, "Failed to set WM8731 SYSCLK: %d\n", ret);
122 return ret;
123 }
124
125 #ifndef ENABLE_MIC_INPUT
126 snd_soc_dapm_nc_pin(&rtd->card->dapm, "Int Mic");
127 #endif
128
129 return 0;
130 }
131
132 static struct snd_soc_dai_link at91sam9g20ek_dai = {
133 .name = "WM8731",
134 .stream_name = "WM8731 PCM",
135 .cpu_dai_name = "at91rm9200_ssc.0",
136 .codec_dai_name = "wm8731-hifi",
137 .init = at91sam9g20ek_wm8731_init,
138 .platform_name = "at91rm9200_ssc.0",
139 .codec_name = "wm8731.0-001b",
140 .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
141 SND_SOC_DAIFMT_CBM_CFM,
142 };
143
144 static struct snd_soc_card snd_soc_at91sam9g20ek = {
145 .name = "AT91SAMG20-EK",
146 .owner = THIS_MODULE,
147 .dai_link = &at91sam9g20ek_dai,
148 .num_links = 1,
149 .set_bias_level = at91sam9g20ek_set_bias_level,
150
151 .dapm_widgets = at91sam9g20ek_dapm_widgets,
152 .num_dapm_widgets = ARRAY_SIZE(at91sam9g20ek_dapm_widgets),
153 .dapm_routes = intercon,
154 .num_dapm_routes = ARRAY_SIZE(intercon),
155 .fully_routed = true,
156 };
157
at91sam9g20ek_audio_probe(struct platform_device * pdev)158 static int at91sam9g20ek_audio_probe(struct platform_device *pdev)
159 {
160 struct device_node *np = pdev->dev.of_node;
161 struct device_node *codec_np, *cpu_np;
162 struct clk *pllb;
163 struct snd_soc_card *card = &snd_soc_at91sam9g20ek;
164 int ret;
165
166 if (!np) {
167 return -ENODEV;
168 }
169
170 ret = atmel_ssc_set_audio(0);
171 if (ret) {
172 dev_err(&pdev->dev, "ssc channel is not valid\n");
173 return -EINVAL;
174 }
175
176 /*
177 * Codec MCLK is supplied by PCK0 - set it up.
178 */
179 mclk = clk_get(NULL, "pck0");
180 if (IS_ERR(mclk)) {
181 dev_err(&pdev->dev, "Failed to get MCLK\n");
182 ret = PTR_ERR(mclk);
183 goto err;
184 }
185
186 pllb = clk_get(NULL, "pllb");
187 if (IS_ERR(pllb)) {
188 dev_err(&pdev->dev, "Failed to get PLLB\n");
189 ret = PTR_ERR(pllb);
190 goto err_mclk;
191 }
192 ret = clk_set_parent(mclk, pllb);
193 clk_put(pllb);
194 if (ret != 0) {
195 dev_err(&pdev->dev, "Failed to set MCLK parent\n");
196 goto err_mclk;
197 }
198
199 clk_set_rate(mclk, MCLK_RATE);
200
201 card->dev = &pdev->dev;
202
203 /* Parse device node info */
204 ret = snd_soc_of_parse_card_name(card, "atmel,model");
205 if (ret)
206 goto err;
207
208 ret = snd_soc_of_parse_audio_routing(card,
209 "atmel,audio-routing");
210 if (ret)
211 goto err;
212
213 /* Parse codec info */
214 at91sam9g20ek_dai.codec_name = NULL;
215 codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
216 if (!codec_np) {
217 dev_err(&pdev->dev, "codec info missing\n");
218 return -EINVAL;
219 }
220 at91sam9g20ek_dai.codec_of_node = codec_np;
221
222 /* Parse dai and platform info */
223 at91sam9g20ek_dai.cpu_dai_name = NULL;
224 at91sam9g20ek_dai.platform_name = NULL;
225 cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
226 if (!cpu_np) {
227 dev_err(&pdev->dev, "dai and pcm info missing\n");
228 return -EINVAL;
229 }
230 at91sam9g20ek_dai.cpu_of_node = cpu_np;
231 at91sam9g20ek_dai.platform_of_node = cpu_np;
232
233 of_node_put(codec_np);
234 of_node_put(cpu_np);
235
236 ret = snd_soc_register_card(card);
237 if (ret) {
238 dev_err(&pdev->dev, "snd_soc_register_card() failed\n");
239 }
240
241 return ret;
242
243 err_mclk:
244 clk_put(mclk);
245 mclk = NULL;
246 err:
247 atmel_ssc_put_audio(0);
248 return ret;
249 }
250
at91sam9g20ek_audio_remove(struct platform_device * pdev)251 static int at91sam9g20ek_audio_remove(struct platform_device *pdev)
252 {
253 struct snd_soc_card *card = platform_get_drvdata(pdev);
254
255 clk_disable(mclk);
256 mclk = NULL;
257 snd_soc_unregister_card(card);
258 atmel_ssc_put_audio(0);
259
260 return 0;
261 }
262
263 #ifdef CONFIG_OF
264 static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = {
265 { .compatible = "atmel,at91sam9g20ek-wm8731-audio", },
266 { }
267 };
268 MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids);
269 #endif
270
271 static struct platform_driver at91sam9g20ek_audio_driver = {
272 .driver = {
273 .name = "at91sam9g20ek-audio",
274 .of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids),
275 },
276 .probe = at91sam9g20ek_audio_probe,
277 .remove = at91sam9g20ek_audio_remove,
278 };
279
280 module_platform_driver(at91sam9g20ek_audio_driver);
281
282 /* Module information */
283 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
284 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
285 MODULE_ALIAS("platform:at91sam9g20ek-audio");
286 MODULE_LICENSE("GPL");
287