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Linux/sound/soc/codecs/wm8728.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * wm8728.c  --  WM8728 ALSA SoC Audio driver
  4  *
  5  * Copyright 2008 Wolfson Microelectronics plc
  6  *
  7  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
  8  */
  9 
 10 #include <linux/module.h>
 11 #include <linux/moduleparam.h>
 12 #include <linux/init.h>
 13 #include <linux/delay.h>
 14 #include <linux/pm.h>
 15 #include <linux/i2c.h>
 16 #include <linux/platform_device.h>
 17 #include <linux/regmap.h>
 18 #include <linux/spi/spi.h>
 19 #include <linux/slab.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 #include <sound/tlv.h>
 27 
 28 #include "wm8728.h"
 29 
 30 /*
 31  * We can't read the WM8728 register space so we cache them instead.
 32  * Note that the defaults here aren't the physical defaults, we latch
 33  * the volume update bits, mute the output and enable infinite zero
 34  * detect.
 35  */
 36 static const struct reg_default wm8728_reg_defaults[] = {
 37         { 0, 0x1ff },
 38         { 1, 0x1ff },
 39         { 2, 0x001 },
 40         { 3, 0x100 },
 41 };
 42 
 43 /* codec private data */
 44 struct wm8728_priv {
 45         struct regmap *regmap;
 46 };
 47 
 48 static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1);
 49 
 50 static const struct snd_kcontrol_new wm8728_snd_controls[] = {
 51 
 52 SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL,
 53                  0, 255, 0, wm8728_tlv),
 54 
 55 SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0),
 56 };
 57 
 58 /*
 59  * DAPM controls.
 60  */
 61 static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = {
 62 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0),
 63 SND_SOC_DAPM_OUTPUT("VOUTL"),
 64 SND_SOC_DAPM_OUTPUT("VOUTR"),
 65 };
 66 
 67 static const struct snd_soc_dapm_route wm8728_intercon[] = {
 68         {"VOUTL", NULL, "DAC"},
 69         {"VOUTR", NULL, "DAC"},
 70 };
 71 
 72 static int wm8728_mute(struct snd_soc_dai *dai, int mute)
 73 {
 74         struct snd_soc_component *component = dai->component;
 75         u16 mute_reg = snd_soc_component_read32(component, WM8728_DACCTL);
 76 
 77         if (mute)
 78                 snd_soc_component_write(component, WM8728_DACCTL, mute_reg | 1);
 79         else
 80                 snd_soc_component_write(component, WM8728_DACCTL, mute_reg & ~1);
 81 
 82         return 0;
 83 }
 84 
 85 static int wm8728_hw_params(struct snd_pcm_substream *substream,
 86         struct snd_pcm_hw_params *params,
 87         struct snd_soc_dai *dai)
 88 {
 89         struct snd_soc_component *component = dai->component;
 90         u16 dac = snd_soc_component_read32(component, WM8728_DACCTL);
 91 
 92         dac &= ~0x18;
 93 
 94         switch (params_width(params)) {
 95         case 16:
 96                 break;
 97         case 20:
 98                 dac |= 0x10;
 99                 break;
100         case 24:
101                 dac |= 0x08;
102                 break;
103         default:
104                 return -EINVAL;
105         }
106 
107         snd_soc_component_write(component, WM8728_DACCTL, dac);
108 
109         return 0;
110 }
111 
112 static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai,
113                 unsigned int fmt)
114 {
115         struct snd_soc_component *component = codec_dai->component;
116         u16 iface = snd_soc_component_read32(component, WM8728_IFCTL);
117 
118         /* Currently only I2S is supported by the driver, though the
119          * hardware is more flexible.
120          */
121         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
122         case SND_SOC_DAIFMT_I2S:
123                 iface |= 1;
124                 break;
125         default:
126                 return -EINVAL;
127         }
128 
129         /* The hardware only support full slave mode */
130         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
131         case SND_SOC_DAIFMT_CBS_CFS:
132                 break;
133         default:
134                 return -EINVAL;
135         }
136 
137         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
138         case SND_SOC_DAIFMT_NB_NF:
139                 iface &= ~0x22;
140                 break;
141         case SND_SOC_DAIFMT_IB_NF:
142                 iface |=  0x20;
143                 iface &= ~0x02;
144                 break;
145         case SND_SOC_DAIFMT_NB_IF:
146                 iface |= 0x02;
147                 iface &= ~0x20;
148                 break;
149         case SND_SOC_DAIFMT_IB_IF:
150                 iface |= 0x22;
151                 break;
152         default:
153                 return -EINVAL;
154         }
155 
156         snd_soc_component_write(component, WM8728_IFCTL, iface);
157         return 0;
158 }
159 
160 static int wm8728_set_bias_level(struct snd_soc_component *component,
161                                  enum snd_soc_bias_level level)
162 {
163         struct wm8728_priv *wm8728 = snd_soc_component_get_drvdata(component);
164         u16 reg;
165 
166         switch (level) {
167         case SND_SOC_BIAS_ON:
168         case SND_SOC_BIAS_PREPARE:
169         case SND_SOC_BIAS_STANDBY:
170                 if (snd_soc_component_get_bias_level(component) == SND_SOC_BIAS_OFF) {
171                         /* Power everything up... */
172                         reg = snd_soc_component_read32(component, WM8728_DACCTL);
173                         snd_soc_component_write(component, WM8728_DACCTL, reg & ~0x4);
174 
175                         /* ..then sync in the register cache. */
176                         regcache_sync(wm8728->regmap);
177                 }
178                 break;
179 
180         case SND_SOC_BIAS_OFF:
181                 reg = snd_soc_component_read32(component, WM8728_DACCTL);
182                 snd_soc_component_write(component, WM8728_DACCTL, reg | 0x4);
183                 break;
184         }
185         return 0;
186 }
187 
188 #define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)
189 
190 #define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
191         SNDRV_PCM_FMTBIT_S24_LE)
192 
193 static const struct snd_soc_dai_ops wm8728_dai_ops = {
194         .hw_params      = wm8728_hw_params,
195         .digital_mute   = wm8728_mute,
196         .set_fmt        = wm8728_set_dai_fmt,
197 };
198 
199 static struct snd_soc_dai_driver wm8728_dai = {
200         .name = "wm8728-hifi",
201         .playback = {
202                 .stream_name = "Playback",
203                 .channels_min = 2,
204                 .channels_max = 2,
205                 .rates = WM8728_RATES,
206                 .formats = WM8728_FORMATS,
207         },
208         .ops = &wm8728_dai_ops,
209 };
210 
211 static const struct snd_soc_component_driver soc_component_dev_wm8728 = {
212         .set_bias_level         = wm8728_set_bias_level,
213         .controls               = wm8728_snd_controls,
214         .num_controls           = ARRAY_SIZE(wm8728_snd_controls),
215         .dapm_widgets           = wm8728_dapm_widgets,
216         .num_dapm_widgets       = ARRAY_SIZE(wm8728_dapm_widgets),
217         .dapm_routes            = wm8728_intercon,
218         .num_dapm_routes        = ARRAY_SIZE(wm8728_intercon),
219         .suspend_bias_off       = 1,
220         .idle_bias_on           = 1,
221         .use_pmdown_time        = 1,
222         .endianness             = 1,
223         .non_legacy_dai_naming  = 1,
224 };
225 
226 static const struct of_device_id wm8728_of_match[] = {
227         { .compatible = "wlf,wm8728", },
228         { }
229 };
230 MODULE_DEVICE_TABLE(of, wm8728_of_match);
231 
232 static const struct regmap_config wm8728_regmap = {
233         .reg_bits = 7,
234         .val_bits = 9,
235         .max_register = WM8728_IFCTL,
236 
237         .reg_defaults = wm8728_reg_defaults,
238         .num_reg_defaults = ARRAY_SIZE(wm8728_reg_defaults),
239         .cache_type = REGCACHE_RBTREE,
240 };
241 
242 #if defined(CONFIG_SPI_MASTER)
243 static int wm8728_spi_probe(struct spi_device *spi)
244 {
245         struct wm8728_priv *wm8728;
246         int ret;
247 
248         wm8728 = devm_kzalloc(&spi->dev, sizeof(struct wm8728_priv),
249                               GFP_KERNEL);
250         if (wm8728 == NULL)
251                 return -ENOMEM;
252 
253         wm8728->regmap = devm_regmap_init_spi(spi, &wm8728_regmap);
254         if (IS_ERR(wm8728->regmap))
255                 return PTR_ERR(wm8728->regmap);
256 
257         spi_set_drvdata(spi, wm8728);
258 
259         ret = devm_snd_soc_register_component(&spi->dev,
260                         &soc_component_dev_wm8728, &wm8728_dai, 1);
261 
262         return ret;
263 }
264 
265 static struct spi_driver wm8728_spi_driver = {
266         .driver = {
267                 .name   = "wm8728",
268                 .of_match_table = wm8728_of_match,
269         },
270         .probe          = wm8728_spi_probe,
271 };
272 #endif /* CONFIG_SPI_MASTER */
273 
274 #if IS_ENABLED(CONFIG_I2C)
275 static int wm8728_i2c_probe(struct i2c_client *i2c,
276                             const struct i2c_device_id *id)
277 {
278         struct wm8728_priv *wm8728;
279         int ret;
280 
281         wm8728 = devm_kzalloc(&i2c->dev, sizeof(struct wm8728_priv),
282                               GFP_KERNEL);
283         if (wm8728 == NULL)
284                 return -ENOMEM;
285 
286         wm8728->regmap = devm_regmap_init_i2c(i2c, &wm8728_regmap);
287         if (IS_ERR(wm8728->regmap))
288                 return PTR_ERR(wm8728->regmap);
289 
290         i2c_set_clientdata(i2c, wm8728);
291 
292         ret =  devm_snd_soc_register_component(&i2c->dev,
293                         &soc_component_dev_wm8728, &wm8728_dai, 1);
294 
295         return ret;
296 }
297 
298 static const struct i2c_device_id wm8728_i2c_id[] = {
299         { "wm8728", 0 },
300         { }
301 };
302 MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);
303 
304 static struct i2c_driver wm8728_i2c_driver = {
305         .driver = {
306                 .name = "wm8728",
307                 .of_match_table = wm8728_of_match,
308         },
309         .probe =    wm8728_i2c_probe,
310         .id_table = wm8728_i2c_id,
311 };
312 #endif
313 
314 static int __init wm8728_modinit(void)
315 {
316         int ret = 0;
317 #if IS_ENABLED(CONFIG_I2C)
318         ret = i2c_add_driver(&wm8728_i2c_driver);
319         if (ret != 0) {
320                 printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n",
321                        ret);
322         }
323 #endif
324 #if defined(CONFIG_SPI_MASTER)
325         ret = spi_register_driver(&wm8728_spi_driver);
326         if (ret != 0) {
327                 printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n",
328                        ret);
329         }
330 #endif
331         return ret;
332 }
333 module_init(wm8728_modinit);
334 
335 static void __exit wm8728_exit(void)
336 {
337 #if IS_ENABLED(CONFIG_I2C)
338         i2c_del_driver(&wm8728_i2c_driver);
339 #endif
340 #if defined(CONFIG_SPI_MASTER)
341         spi_unregister_driver(&wm8728_spi_driver);
342 #endif
343 }
344 module_exit(wm8728_exit);
345 
346 MODULE_DESCRIPTION("ASoC WM8728 driver");
347 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
348 MODULE_LICENSE("GPL");
349 

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