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Linux/sound/soc/atmel/sam9g20_wm8731.c

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  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 struct clk *mclk;
 50 
 51 static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card,
 52                                         struct snd_soc_dapm_context *dapm,
 53                                         enum snd_soc_bias_level level)
 54 {
 55         static int mclk_on;
 56         int ret = 0;
 57 
 58         switch (level) {
 59         case SND_SOC_BIAS_ON:
 60         case SND_SOC_BIAS_PREPARE:
 61                 if (!mclk_on)
 62                         ret = clk_enable(mclk);
 63                 if (ret == 0)
 64                         mclk_on = 1;
 65                 break;
 66 
 67         case SND_SOC_BIAS_OFF:
 68         case SND_SOC_BIAS_STANDBY:
 69                 if (mclk_on)
 70                         clk_disable(mclk);
 71                 mclk_on = 0;
 72                 break;
 73         }
 74 
 75         return ret;
 76 }
 77 
 78 static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
 79         SND_SOC_DAPM_MIC("Int Mic", NULL),
 80         SND_SOC_DAPM_SPK("Ext Spk", NULL),
 81 };
 82 
 83 static const struct snd_soc_dapm_route intercon[] = {
 84 
 85         /* speaker connected to LHPOUT/RHPOUT */
 86         {"Ext Spk", NULL, "LHPOUT"},
 87         {"Ext Spk", NULL, "RHPOUT"},
 88 
 89         /* mic is connected to Mic Jack, with WM8731 Mic Bias */
 90         {"MICIN", NULL, "Mic Bias"},
 91         {"Mic Bias", NULL, "Int Mic"},
 92 };
 93 
 94 /*
 95  * Logic for a wm8731 as connected on a at91sam9g20ek board.
 96  */
 97 static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd)
 98 {
 99         struct snd_soc_dai *codec_dai = rtd->codec_dai;
100         struct device *dev = rtd->dev;
101         int ret;
102 
103         dev_dbg(dev, "%s called\n", __func__);
104 
105         ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK,
106                                      MCLK_RATE, SND_SOC_CLOCK_IN);
107         if (ret < 0) {
108                 dev_err(dev, "Failed to set WM8731 SYSCLK: %d\n", ret);
109                 return ret;
110         }
111 
112 #ifndef ENABLE_MIC_INPUT
113         snd_soc_dapm_nc_pin(&rtd->card->dapm, "Int Mic");
114 #endif
115 
116         return 0;
117 }
118 
119 SND_SOC_DAILINK_DEFS(pcm,
120         DAILINK_COMP_ARRAY(COMP_CPU("at91rm9200_ssc.0")),
121         DAILINK_COMP_ARRAY(COMP_CODEC("wm8731.0-001b", "wm8731-hifi")),
122         DAILINK_COMP_ARRAY(COMP_PLATFORM("at91rm9200_ssc.0")));
123 
124 static struct snd_soc_dai_link at91sam9g20ek_dai = {
125         .name = "WM8731",
126         .stream_name = "WM8731 PCM",
127         .init = at91sam9g20ek_wm8731_init,
128         .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
129                    SND_SOC_DAIFMT_CBM_CFM,
130         SND_SOC_DAILINK_REG(pcm),
131 };
132 
133 static struct snd_soc_card snd_soc_at91sam9g20ek = {
134         .name = "AT91SAMG20-EK",
135         .owner = THIS_MODULE,
136         .dai_link = &at91sam9g20ek_dai,
137         .num_links = 1,
138         .set_bias_level = at91sam9g20ek_set_bias_level,
139 
140         .dapm_widgets = at91sam9g20ek_dapm_widgets,
141         .num_dapm_widgets = ARRAY_SIZE(at91sam9g20ek_dapm_widgets),
142         .dapm_routes = intercon,
143         .num_dapm_routes = ARRAY_SIZE(intercon),
144         .fully_routed = true,
145 };
146 
147 static int at91sam9g20ek_audio_probe(struct platform_device *pdev)
148 {
149         struct device_node *np = pdev->dev.of_node;
150         struct device_node *codec_np, *cpu_np;
151         struct clk *pllb;
152         struct snd_soc_card *card = &snd_soc_at91sam9g20ek;
153         int ret;
154 
155         if (!np) {
156                 return -ENODEV;
157         }
158 
159         ret = atmel_ssc_set_audio(0);
160         if (ret) {
161                 dev_err(&pdev->dev, "ssc channel is not valid\n");
162                 return -EINVAL;
163         }
164 
165         /*
166          * Codec MCLK is supplied by PCK0 - set it up.
167          */
168         mclk = clk_get(NULL, "pck0");
169         if (IS_ERR(mclk)) {
170                 dev_err(&pdev->dev, "Failed to get MCLK\n");
171                 ret = PTR_ERR(mclk);
172                 goto err;
173         }
174 
175         pllb = clk_get(NULL, "pllb");
176         if (IS_ERR(pllb)) {
177                 dev_err(&pdev->dev, "Failed to get PLLB\n");
178                 ret = PTR_ERR(pllb);
179                 goto err_mclk;
180         }
181         ret = clk_set_parent(mclk, pllb);
182         clk_put(pllb);
183         if (ret != 0) {
184                 dev_err(&pdev->dev, "Failed to set MCLK parent\n");
185                 goto err_mclk;
186         }
187 
188         clk_set_rate(mclk, MCLK_RATE);
189 
190         card->dev = &pdev->dev;
191 
192         /* Parse device node info */
193         ret = snd_soc_of_parse_card_name(card, "atmel,model");
194         if (ret)
195                 goto err;
196 
197         ret = snd_soc_of_parse_audio_routing(card,
198                 "atmel,audio-routing");
199         if (ret)
200                 goto err;
201 
202         /* Parse codec info */
203         at91sam9g20ek_dai.codecs->name = NULL;
204         codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
205         if (!codec_np) {
206                 dev_err(&pdev->dev, "codec info missing\n");
207                 return -EINVAL;
208         }
209         at91sam9g20ek_dai.codecs->of_node = codec_np;
210 
211         /* Parse dai and platform info */
212         at91sam9g20ek_dai.cpus->dai_name = NULL;
213         at91sam9g20ek_dai.platforms->name = NULL;
214         cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
215         if (!cpu_np) {
216                 dev_err(&pdev->dev, "dai and pcm info missing\n");
217                 return -EINVAL;
218         }
219         at91sam9g20ek_dai.cpus->of_node = cpu_np;
220         at91sam9g20ek_dai.platforms->of_node = cpu_np;
221 
222         of_node_put(codec_np);
223         of_node_put(cpu_np);
224 
225         ret = snd_soc_register_card(card);
226         if (ret) {
227                 dev_err(&pdev->dev, "snd_soc_register_card() failed\n");
228         }
229 
230         return ret;
231 
232 err_mclk:
233         clk_put(mclk);
234         mclk = NULL;
235 err:
236         atmel_ssc_put_audio(0);
237         return ret;
238 }
239 
240 static int at91sam9g20ek_audio_remove(struct platform_device *pdev)
241 {
242         struct snd_soc_card *card = platform_get_drvdata(pdev);
243 
244         clk_disable(mclk);
245         mclk = NULL;
246         snd_soc_unregister_card(card);
247         atmel_ssc_put_audio(0);
248 
249         return 0;
250 }
251 
252 #ifdef CONFIG_OF
253 static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = {
254         { .compatible = "atmel,at91sam9g20ek-wm8731-audio", },
255         { }
256 };
257 MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids);
258 #endif
259 
260 static struct platform_driver at91sam9g20ek_audio_driver = {
261         .driver = {
262                 .name   = "at91sam9g20ek-audio",
263                 .of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids),
264         },
265         .probe  = at91sam9g20ek_audio_probe,
266         .remove = at91sam9g20ek_audio_remove,
267 };
268 
269 module_platform_driver(at91sam9g20ek_audio_driver);
270 
271 /* Module information */
272 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
273 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
274 MODULE_ALIAS("platform:at91sam9g20ek-audio");
275 MODULE_LICENSE("GPL");
276 

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