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Linux/sound/soc/codecs/wm8524.c

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  1 /*
  2  * wm8524.c  --  WM8524 ALSA SoC Audio driver
  3  *
  4  * Copyright 2009 Wolfson Microelectronics plc
  5  * Copyright 2017 NXP
  6  *
  7  * Based on WM8523 ALSA SoC Audio driver written by Mark Brown
  8  *
  9  * This program is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License version 2 as
 11  * published by the Free Software Foundation.
 12  */
 13 
 14 #include <linux/module.h>
 15 #include <linux/moduleparam.h>
 16 #include <linux/init.h>
 17 #include <linux/delay.h>
 18 #include <linux/slab.h>
 19 #include <linux/gpio/consumer.h>
 20 #include <linux/of_device.h>
 21 #include <sound/core.h>
 22 #include <sound/pcm.h>
 23 #include <sound/pcm_params.h>
 24 #include <sound/soc.h>
 25 #include <sound/initval.h>
 26 
 27 #define WM8524_NUM_RATES 7
 28 
 29 /* codec private data */
 30 struct wm8524_priv {
 31         struct gpio_desc *mute;
 32         unsigned int sysclk;
 33         unsigned int rate_constraint_list[WM8524_NUM_RATES];
 34         struct snd_pcm_hw_constraint_list rate_constraint;
 35 };
 36 
 37 
 38 static const struct snd_soc_dapm_widget wm8524_dapm_widgets[] = {
 39 SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
 40 SND_SOC_DAPM_OUTPUT("LINEVOUTL"),
 41 SND_SOC_DAPM_OUTPUT("LINEVOUTR"),
 42 };
 43 
 44 static const struct snd_soc_dapm_route wm8524_dapm_routes[] = {
 45         { "LINEVOUTL", NULL, "DAC" },
 46         { "LINEVOUTR", NULL, "DAC" },
 47 };
 48 
 49 static const struct {
 50         int value;
 51         int ratio;
 52 } lrclk_ratios[WM8524_NUM_RATES] = {
 53         { 1, 128 },
 54         { 2, 192 },
 55         { 3, 256 },
 56         { 4, 384 },
 57         { 5, 512 },
 58         { 6, 768 },
 59         { 7, 1152 },
 60 };
 61 
 62 static int wm8524_startup(struct snd_pcm_substream *substream,
 63                           struct snd_soc_dai *dai)
 64 {
 65         struct snd_soc_codec *codec = dai->codec;
 66         struct wm8524_priv *wm8524 = snd_soc_codec_get_drvdata(codec);
 67 
 68         /* The set of sample rates that can be supported depends on the
 69          * MCLK supplied to the CODEC - enforce this.
 70          */
 71         if (!wm8524->sysclk) {
 72                 dev_err(codec->dev,
 73                         "No MCLK configured, call set_sysclk() on init\n");
 74                 return -EINVAL;
 75         }
 76 
 77         snd_pcm_hw_constraint_list(substream->runtime, 0,
 78                                    SNDRV_PCM_HW_PARAM_RATE,
 79                                    &wm8524->rate_constraint);
 80 
 81         gpiod_set_value_cansleep(wm8524->mute, 1);
 82 
 83         return 0;
 84 }
 85 
 86 static void wm8524_shutdown(struct snd_pcm_substream *substream,
 87                           struct snd_soc_dai *dai)
 88 {
 89         struct snd_soc_codec *codec = dai->codec;
 90         struct wm8524_priv *wm8524 = snd_soc_codec_get_drvdata(codec);
 91 
 92         gpiod_set_value_cansleep(wm8524->mute, 0);
 93 }
 94 
 95 static int wm8524_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 96                 int clk_id, unsigned int freq, int dir)
 97 {
 98         struct snd_soc_codec *codec = codec_dai->codec;
 99         struct wm8524_priv *wm8524 = snd_soc_codec_get_drvdata(codec);
100         unsigned int val;
101         int i, j = 0;
102 
103         wm8524->sysclk = freq;
104 
105         wm8524->rate_constraint.count = 0;
106         for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
107                 val = freq / lrclk_ratios[i].ratio;
108                 /* Check that it's a standard rate since core can't
109                  * cope with others and having the odd rates confuses
110                  * constraint matching.
111                  */
112                 switch (val) {
113                 case 8000:
114                 case 32000:
115                 case 44100:
116                 case 48000:
117                 case 88200:
118                 case 96000:
119                 case 176400:
120                 case 192000:
121                         dev_dbg(codec->dev, "Supported sample rate: %dHz\n",
122                                 val);
123                         wm8524->rate_constraint_list[j++] = val;
124                         wm8524->rate_constraint.count++;
125                         break;
126                 default:
127                         dev_dbg(codec->dev, "Skipping sample rate: %dHz\n",
128                                 val);
129                 }
130         }
131 
132         /* Need at least one supported rate... */
133         if (wm8524->rate_constraint.count == 0)
134                 return -EINVAL;
135 
136         return 0;
137 }
138 
139 static int wm8524_set_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
140 {
141         fmt &= (SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_INV_MASK |
142                 SND_SOC_DAIFMT_MASTER_MASK);
143 
144         if (fmt != (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
145                     SND_SOC_DAIFMT_CBS_CFS)) {
146                 dev_err(codec_dai->dev, "Invalid DAI format\n");
147                 return -EINVAL;
148         }
149 
150         return 0;
151 }
152 
153 static int wm8524_mute_stream(struct snd_soc_dai *dai, int mute, int stream)
154 {
155         struct wm8524_priv *wm8524 = snd_soc_codec_get_drvdata(dai->codec);
156 
157         if (wm8524->mute)
158                 gpiod_set_value_cansleep(wm8524->mute, mute);
159 
160         return 0;
161 }
162 
163 #define WM8524_RATES SNDRV_PCM_RATE_8000_192000
164 
165 #define WM8524_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE)
166 
167 static const struct snd_soc_dai_ops wm8524_dai_ops = {
168         .startup        = wm8524_startup,
169         .shutdown       = wm8524_shutdown,
170         .set_sysclk     = wm8524_set_dai_sysclk,
171         .set_fmt        = wm8524_set_fmt,
172         .mute_stream    = wm8524_mute_stream,
173 };
174 
175 static struct snd_soc_dai_driver wm8524_dai = {
176         .name = "wm8524-hifi",
177         .playback = {
178                 .stream_name = "Playback",
179                 .channels_min = 2,
180                 .channels_max = 2,
181                 .rates = WM8524_RATES,
182                 .formats = WM8524_FORMATS,
183         },
184         .ops = &wm8524_dai_ops,
185 };
186 
187 static int wm8524_probe(struct snd_soc_codec *codec)
188 {
189         struct wm8524_priv *wm8524 = snd_soc_codec_get_drvdata(codec);
190 
191         wm8524->rate_constraint.list = &wm8524->rate_constraint_list[0];
192         wm8524->rate_constraint.count =
193                 ARRAY_SIZE(wm8524->rate_constraint_list);
194 
195         return 0;
196 }
197 
198 static const struct snd_soc_codec_driver soc_codec_dev_wm8524 = {
199         .probe =        wm8524_probe,
200 
201         .component_driver = {
202                 .dapm_widgets           = wm8524_dapm_widgets,
203                 .num_dapm_widgets       = ARRAY_SIZE(wm8524_dapm_widgets),
204                 .dapm_routes            = wm8524_dapm_routes,
205                 .num_dapm_routes        = ARRAY_SIZE(wm8524_dapm_routes),
206         },
207 };
208 
209 static const struct of_device_id wm8524_of_match[] = {
210         { .compatible = "wlf,wm8524" },
211         { /* sentinel*/ }
212 };
213 MODULE_DEVICE_TABLE(of, wm8524_of_match);
214 
215 static int wm8524_codec_probe(struct platform_device *pdev)
216 {
217         struct wm8524_priv *wm8524;
218         int ret;
219 
220         wm8524 = devm_kzalloc(&pdev->dev, sizeof(struct wm8524_priv),
221                                                   GFP_KERNEL);
222         if (wm8524 == NULL)
223                 return -ENOMEM;
224 
225         platform_set_drvdata(pdev, wm8524);
226 
227         wm8524->mute = devm_gpiod_get(&pdev->dev, "wlf,mute", GPIOD_OUT_LOW);
228         if (IS_ERR(wm8524->mute)) {
229                 ret = PTR_ERR(wm8524->mute);
230                 dev_err(&pdev->dev, "Failed to get mute line: %d\n", ret);
231                 return ret;
232         }
233 
234         ret =  snd_soc_register_codec(&pdev->dev,
235                         &soc_codec_dev_wm8524, &wm8524_dai, 1);
236         if (ret < 0)
237                 dev_err(&pdev->dev, "Failed to register codec: %d\n", ret);
238 
239         return ret;
240 }
241 
242 static int wm8524_codec_remove(struct platform_device *pdev)
243 {
244         snd_soc_unregister_codec(&pdev->dev);
245         return 0;
246 }
247 
248 static struct platform_driver wm8524_codec_driver = {
249         .probe          = wm8524_codec_probe,
250         .remove         = wm8524_codec_remove,
251         .driver         = {
252                 .name   = "wm8524-codec",
253                 .of_match_table = wm8524_of_match,
254         },
255 };
256 module_platform_driver(wm8524_codec_driver);
257 
258 MODULE_DESCRIPTION("ASoC WM8524 driver");
259 MODULE_AUTHOR("Mihai Serban <mihai.serban@nxp.com>");
260 MODULE_ALIAS("platform:wm8524-codec");
261 MODULE_LICENSE("GPL");
262 

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