1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * sam9g20_wm8731 -- SoC audio for AT91SAM9G20-based
4 * ATMEL AT91SAM9G20ek board.
5 *
6 * Copyright (C) 2005 SAN People
7 * Copyright (C) 2008 Atmel
8 *
9 * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
10 *
11 * Based on ati_b1_wm8731.c by:
12 * Frank Mandarino <fmandarino@endrelia.com>
13 * Copyright 2006 Endrelia Technologies Inc.
14 * Based on corgi.c by:
15 * Copyright 2005 Wolfson Microelectronics PLC.
16 * Copyright 2005 Openedhand Ltd.
17 */
18
19 #include <linux/module.h>
20 #include <linux/moduleparam.h>
21 #include <linux/kernel.h>
22 #include <linux/clk.h>
23 #include <linux/timer.h>
24 #include <linux/interrupt.h>
25 #include <linux/platform_device.h>
26 #include <linux/i2c.h>
27 #include <linux/of.h>
28
29 #include <linux/atmel-ssc.h>
30
31 #include <sound/core.h>
32 #include <sound/pcm.h>
33 #include <sound/pcm_params.h>
34 #include <sound/soc.h>
35
36 #include "../codecs/wm8731.h"
37 #include "atmel-pcm.h"
38 #include "atmel_ssc_dai.h"
39
40 #define MCLK_RATE 12000000
41
42 /*
43 * As shipped the board does not have inputs. However, it is relatively
44 * straightforward to modify the board to hook them up so support is left
45 * in the driver.
46 */
47 #undef ENABLE_MIC_INPUT
48
49 static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
50 SND_SOC_DAPM_MIC("Int Mic", NULL),
51 SND_SOC_DAPM_SPK("Ext Spk", NULL),
52 };
53
54 static const struct snd_soc_dapm_route intercon[] = {
55
56 /* speaker connected to LHPOUT/RHPOUT */
57 {"Ext Spk", NULL, "LHPOUT"},
58 {"Ext Spk", NULL, "RHPOUT"},
59
60 /* mic is connected to Mic Jack, with WM8731 Mic Bias */
61 {"MICIN", NULL, "Mic Bias"},
62 {"Mic Bias", NULL, "Int Mic"},
63 };
64
65 /*
66 * Logic for a wm8731 as connected on a at91sam9g20ek board.
67 */
at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime * rtd)68 static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd)
69 {
70 struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
71 struct device *dev = rtd->dev;
72 int ret;
73
74 dev_dbg(dev, "%s called\n", __func__);
75
76 ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK,
77 MCLK_RATE, SND_SOC_CLOCK_IN);
78 if (ret < 0) {
79 dev_err(dev, "Failed to set WM8731 SYSCLK: %d\n", ret);
80 return ret;
81 }
82
83 #ifndef ENABLE_MIC_INPUT
84 snd_soc_dapm_nc_pin(&rtd->card->dapm, "Int Mic");
85 #endif
86
87 return 0;
88 }
89
90 SND_SOC_DAILINK_DEFS(pcm,
91 DAILINK_COMP_ARRAY(COMP_CPU("at91rm9200_ssc.0")),
92 DAILINK_COMP_ARRAY(COMP_CODEC("wm8731.0-001b", "wm8731-hifi")),
93 DAILINK_COMP_ARRAY(COMP_PLATFORM("at91rm9200_ssc.0")));
94
95 static struct snd_soc_dai_link at91sam9g20ek_dai = {
96 .name = "WM8731",
97 .stream_name = "WM8731 PCM",
98 .init = at91sam9g20ek_wm8731_init,
99 .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
100 SND_SOC_DAIFMT_CBP_CFP,
101 #ifndef ENABLE_MIC_INPUT
102 .playback_only = true,
103 #endif
104 SND_SOC_DAILINK_REG(pcm),
105 };
106
107 static struct snd_soc_card snd_soc_at91sam9g20ek = {
108 .name = "AT91SAMG20-EK",
109 .owner = THIS_MODULE,
110 .dai_link = &at91sam9g20ek_dai,
111 .num_links = 1,
112
113 .dapm_widgets = at91sam9g20ek_dapm_widgets,
114 .num_dapm_widgets = ARRAY_SIZE(at91sam9g20ek_dapm_widgets),
115 .dapm_routes = intercon,
116 .num_dapm_routes = ARRAY_SIZE(intercon),
117 .fully_routed = true,
118 };
119
at91sam9g20ek_audio_probe(struct platform_device * pdev)120 static int at91sam9g20ek_audio_probe(struct platform_device *pdev)
121 {
122 struct device_node *np = pdev->dev.of_node;
123 struct device_node *codec_np, *cpu_np;
124 struct snd_soc_card *card = &snd_soc_at91sam9g20ek;
125 int ret;
126
127 if (!np) {
128 return -ENODEV;
129 }
130
131 ret = atmel_ssc_set_audio(0);
132 if (ret) {
133 dev_err(&pdev->dev, "ssc channel is not valid: %d\n", ret);
134 return ret;
135 }
136
137 card->dev = &pdev->dev;
138
139 /* Parse device node info */
140 ret = snd_soc_of_parse_card_name(card, "atmel,model");
141 if (ret)
142 goto err;
143
144 ret = snd_soc_of_parse_audio_routing(card,
145 "atmel,audio-routing");
146 if (ret)
147 goto err;
148
149 /* Parse codec info */
150 at91sam9g20ek_dai.codecs->name = NULL;
151 codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
152 if (!codec_np) {
153 dev_err(&pdev->dev, "codec info missing\n");
154 ret = -EINVAL;
155 goto err;
156 }
157 at91sam9g20ek_dai.codecs->of_node = codec_np;
158
159 /* Parse dai and platform info */
160 at91sam9g20ek_dai.cpus->dai_name = NULL;
161 at91sam9g20ek_dai.platforms->name = NULL;
162 cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
163 if (!cpu_np) {
164 dev_err(&pdev->dev, "dai and pcm info missing\n");
165 of_node_put(codec_np);
166 ret = -EINVAL;
167 goto err;
168 }
169 at91sam9g20ek_dai.cpus->of_node = cpu_np;
170 at91sam9g20ek_dai.platforms->of_node = cpu_np;
171
172 of_node_put(codec_np);
173 of_node_put(cpu_np);
174
175 ret = snd_soc_register_card(card);
176 if (ret) {
177 dev_err_probe(&pdev->dev, ret,
178 "snd_soc_register_card() failed\n");
179 goto err;
180 }
181
182 return 0;
183
184 err:
185 atmel_ssc_put_audio(0);
186 return ret;
187 }
188
at91sam9g20ek_audio_remove(struct platform_device * pdev)189 static int at91sam9g20ek_audio_remove(struct platform_device *pdev)
190 {
191 struct snd_soc_card *card = platform_get_drvdata(pdev);
192
193 snd_soc_unregister_card(card);
194 atmel_ssc_put_audio(0);
195
196 return 0;
197 }
198
199 #ifdef CONFIG_OF
200 static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = {
201 { .compatible = "atmel,at91sam9g20ek-wm8731-audio", },
202 { }
203 };
204 MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids);
205 #endif
206
207 static struct platform_driver at91sam9g20ek_audio_driver = {
208 .driver = {
209 .name = "at91sam9g20ek-audio",
210 .of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids),
211 },
212 .probe = at91sam9g20ek_audio_probe,
213 .remove = at91sam9g20ek_audio_remove,
214 };
215
216 module_platform_driver(at91sam9g20ek_audio_driver);
217
218 /* Module information */
219 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
220 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
221 MODULE_ALIAS("platform:at91sam9g20ek-audio");
222 MODULE_LICENSE("GPL");
223