1 /* 2 * wm8728.c -- WM8728 ALSA SoC Audio driver 3 * 4 * Copyright 2008 Wolfson Microelectronics plc 5 * 6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13 #include <linux/module.h> 14 #include <linux/moduleparam.h> 15 #include <linux/init.h> 16 #include <linux/delay.h> 17 #include <linux/pm.h> 18 #include <linux/i2c.h> 19 #include <linux/platform_device.h> 20 #include <linux/regmap.h> 21 #include <linux/spi/spi.h> 22 #include <linux/slab.h> 23 #include <linux/of_device.h> 24 #include <sound/core.h> 25 #include <sound/pcm.h> 26 #include <sound/pcm_params.h> 27 #include <sound/soc.h> 28 #include <sound/initval.h> 29 #include <sound/tlv.h> 30 31 #include "wm8728.h" 32 33 /* 34 * We can't read the WM8728 register space so we cache them instead. 35 * Note that the defaults here aren't the physical defaults, we latch 36 * the volume update bits, mute the output and enable infinite zero 37 * detect. 38 */ 39 static const struct reg_default wm8728_reg_defaults[] = { 40 { 0, 0x1ff }, 41 { 1, 0x1ff }, 42 { 2, 0x001 }, 43 { 3, 0x100 }, 44 }; 45 46 /* codec private data */ 47 struct wm8728_priv { 48 struct regmap *regmap; 49 }; 50 51 static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1); 52 53 static const struct snd_kcontrol_new wm8728_snd_controls[] = { 54 55 SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL, 56 0, 255, 0, wm8728_tlv), 57 58 SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0), 59 }; 60 61 /* 62 * DAPM controls. 63 */ 64 static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = { 65 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0), 66 SND_SOC_DAPM_OUTPUT("VOUTL"), 67 SND_SOC_DAPM_OUTPUT("VOUTR"), 68 }; 69 70 static const struct snd_soc_dapm_route wm8728_intercon[] = { 71 {"VOUTL", NULL, "DAC"}, 72 {"VOUTR", NULL, "DAC"}, 73 }; 74 75 static int wm8728_mute(struct snd_soc_dai *dai, int mute) 76 { 77 struct snd_soc_codec *codec = dai->codec; 78 u16 mute_reg = snd_soc_read(codec, WM8728_DACCTL); 79 80 if (mute) 81 snd_soc_write(codec, WM8728_DACCTL, mute_reg | 1); 82 else 83 snd_soc_write(codec, WM8728_DACCTL, mute_reg & ~1); 84 85 return 0; 86 } 87 88 static int wm8728_hw_params(struct snd_pcm_substream *substream, 89 struct snd_pcm_hw_params *params, 90 struct snd_soc_dai *dai) 91 { 92 struct snd_soc_codec *codec = dai->codec; 93 u16 dac = snd_soc_read(codec, WM8728_DACCTL); 94 95 dac &= ~0x18; 96 97 switch (params_width(params)) { 98 case 16: 99 break; 100 case 20: 101 dac |= 0x10; 102 break; 103 case 24: 104 dac |= 0x08; 105 break; 106 default: 107 return -EINVAL; 108 } 109 110 snd_soc_write(codec, WM8728_DACCTL, dac); 111 112 return 0; 113 } 114 115 static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai, 116 unsigned int fmt) 117 { 118 struct snd_soc_codec *codec = codec_dai->codec; 119 u16 iface = snd_soc_read(codec, WM8728_IFCTL); 120 121 /* Currently only I2S is supported by the driver, though the 122 * hardware is more flexible. 123 */ 124 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 125 case SND_SOC_DAIFMT_I2S: 126 iface |= 1; 127 break; 128 default: 129 return -EINVAL; 130 } 131 132 /* The hardware only support full slave mode */ 133 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { 134 case SND_SOC_DAIFMT_CBS_CFS: 135 break; 136 default: 137 return -EINVAL; 138 } 139 140 switch (fmt & SND_SOC_DAIFMT_INV_MASK) { 141 case SND_SOC_DAIFMT_NB_NF: 142 iface &= ~0x22; 143 break; 144 case SND_SOC_DAIFMT_IB_NF: 145 iface |= 0x20; 146 iface &= ~0x02; 147 break; 148 case SND_SOC_DAIFMT_NB_IF: 149 iface |= 0x02; 150 iface &= ~0x20; 151 break; 152 case SND_SOC_DAIFMT_IB_IF: 153 iface |= 0x22; 154 break; 155 default: 156 return -EINVAL; 157 } 158 159 snd_soc_write(codec, WM8728_IFCTL, iface); 160 return 0; 161 } 162 163 static int wm8728_set_bias_level(struct snd_soc_codec *codec, 164 enum snd_soc_bias_level level) 165 { 166 struct wm8728_priv *wm8728 = snd_soc_codec_get_drvdata(codec); 167 u16 reg; 168 169 switch (level) { 170 case SND_SOC_BIAS_ON: 171 case SND_SOC_BIAS_PREPARE: 172 case SND_SOC_BIAS_STANDBY: 173 if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) { 174 /* Power everything up... */ 175 reg = snd_soc_read(codec, WM8728_DACCTL); 176 snd_soc_write(codec, WM8728_DACCTL, reg & ~0x4); 177 178 /* ..then sync in the register cache. */ 179 regcache_sync(wm8728->regmap); 180 } 181 break; 182 183 case SND_SOC_BIAS_OFF: 184 reg = snd_soc_read(codec, WM8728_DACCTL); 185 snd_soc_write(codec, WM8728_DACCTL, reg | 0x4); 186 break; 187 } 188 codec->dapm.bias_level = level; 189 return 0; 190 } 191 192 #define WM8728_RATES (SNDRV_PCM_RATE_8000_192000) 193 194 #define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\ 195 SNDRV_PCM_FMTBIT_S24_LE) 196 197 static const struct snd_soc_dai_ops wm8728_dai_ops = { 198 .hw_params = wm8728_hw_params, 199 .digital_mute = wm8728_mute, 200 .set_fmt = wm8728_set_dai_fmt, 201 }; 202 203 static struct snd_soc_dai_driver wm8728_dai = { 204 .name = "wm8728-hifi", 205 .playback = { 206 .stream_name = "Playback", 207 .channels_min = 2, 208 .channels_max = 2, 209 .rates = WM8728_RATES, 210 .formats = WM8728_FORMATS, 211 }, 212 .ops = &wm8728_dai_ops, 213 }; 214 215 static int wm8728_suspend(struct snd_soc_codec *codec) 216 { 217 wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF); 218 219 return 0; 220 } 221 222 static int wm8728_resume(struct snd_soc_codec *codec) 223 { 224 wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY); 225 226 return 0; 227 } 228 229 static int wm8728_probe(struct snd_soc_codec *codec) 230 { 231 /* power on device */ 232 wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY); 233 234 return 0; 235 } 236 237 static int wm8728_remove(struct snd_soc_codec *codec) 238 { 239 wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF); 240 return 0; 241 } 242 243 static struct snd_soc_codec_driver soc_codec_dev_wm8728 = { 244 .probe = wm8728_probe, 245 .remove = wm8728_remove, 246 .suspend = wm8728_suspend, 247 .resume = wm8728_resume, 248 .set_bias_level = wm8728_set_bias_level, 249 .controls = wm8728_snd_controls, 250 .num_controls = ARRAY_SIZE(wm8728_snd_controls), 251 .dapm_widgets = wm8728_dapm_widgets, 252 .num_dapm_widgets = ARRAY_SIZE(wm8728_dapm_widgets), 253 .dapm_routes = wm8728_intercon, 254 .num_dapm_routes = ARRAY_SIZE(wm8728_intercon), 255 }; 256 257 static const struct of_device_id wm8728_of_match[] = { 258 { .compatible = "wlf,wm8728", }, 259 { } 260 }; 261 MODULE_DEVICE_TABLE(of, wm8728_of_match); 262 263 static const struct regmap_config wm8728_regmap = { 264 .reg_bits = 7, 265 .val_bits = 9, 266 .max_register = WM8728_IFCTL, 267 268 .reg_defaults = wm8728_reg_defaults, 269 .num_reg_defaults = ARRAY_SIZE(wm8728_reg_defaults), 270 .cache_type = REGCACHE_RBTREE, 271 }; 272 273 #if defined(CONFIG_SPI_MASTER) 274 static int wm8728_spi_probe(struct spi_device *spi) 275 { 276 struct wm8728_priv *wm8728; 277 int ret; 278 279 wm8728 = devm_kzalloc(&spi->dev, sizeof(struct wm8728_priv), 280 GFP_KERNEL); 281 if (wm8728 == NULL) 282 return -ENOMEM; 283 284 wm8728->regmap = devm_regmap_init_spi(spi, &wm8728_regmap); 285 if (IS_ERR(wm8728->regmap)) 286 return PTR_ERR(wm8728->regmap); 287 288 spi_set_drvdata(spi, wm8728); 289 290 ret = snd_soc_register_codec(&spi->dev, 291 &soc_codec_dev_wm8728, &wm8728_dai, 1); 292 293 return ret; 294 } 295 296 static int wm8728_spi_remove(struct spi_device *spi) 297 { 298 snd_soc_unregister_codec(&spi->dev); 299 300 return 0; 301 } 302 303 static struct spi_driver wm8728_spi_driver = { 304 .driver = { 305 .name = "wm8728", 306 .owner = THIS_MODULE, 307 .of_match_table = wm8728_of_match, 308 }, 309 .probe = wm8728_spi_probe, 310 .remove = wm8728_spi_remove, 311 }; 312 #endif /* CONFIG_SPI_MASTER */ 313 314 #if IS_ENABLED(CONFIG_I2C) 315 static int wm8728_i2c_probe(struct i2c_client *i2c, 316 const struct i2c_device_id *id) 317 { 318 struct wm8728_priv *wm8728; 319 int ret; 320 321 wm8728 = devm_kzalloc(&i2c->dev, sizeof(struct wm8728_priv), 322 GFP_KERNEL); 323 if (wm8728 == NULL) 324 return -ENOMEM; 325 326 wm8728->regmap = devm_regmap_init_i2c(i2c, &wm8728_regmap); 327 if (IS_ERR(wm8728->regmap)) 328 return PTR_ERR(wm8728->regmap); 329 330 i2c_set_clientdata(i2c, wm8728); 331 332 ret = snd_soc_register_codec(&i2c->dev, 333 &soc_codec_dev_wm8728, &wm8728_dai, 1); 334 335 return ret; 336 } 337 338 static int wm8728_i2c_remove(struct i2c_client *client) 339 { 340 snd_soc_unregister_codec(&client->dev); 341 return 0; 342 } 343 344 static const struct i2c_device_id wm8728_i2c_id[] = { 345 { "wm8728", 0 }, 346 { } 347 }; 348 MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id); 349 350 static struct i2c_driver wm8728_i2c_driver = { 351 .driver = { 352 .name = "wm8728", 353 .owner = THIS_MODULE, 354 .of_match_table = wm8728_of_match, 355 }, 356 .probe = wm8728_i2c_probe, 357 .remove = wm8728_i2c_remove, 358 .id_table = wm8728_i2c_id, 359 }; 360 #endif 361 362 static int __init wm8728_modinit(void) 363 { 364 int ret = 0; 365 #if IS_ENABLED(CONFIG_I2C) 366 ret = i2c_add_driver(&wm8728_i2c_driver); 367 if (ret != 0) { 368 printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n", 369 ret); 370 } 371 #endif 372 #if defined(CONFIG_SPI_MASTER) 373 ret = spi_register_driver(&wm8728_spi_driver); 374 if (ret != 0) { 375 printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n", 376 ret); 377 } 378 #endif 379 return ret; 380 } 381 module_init(wm8728_modinit); 382 383 static void __exit wm8728_exit(void) 384 { 385 #if IS_ENABLED(CONFIG_I2C) 386 i2c_del_driver(&wm8728_i2c_driver); 387 #endif 388 #if defined(CONFIG_SPI_MASTER) 389 spi_unregister_driver(&wm8728_spi_driver); 390 #endif 391 } 392 module_exit(wm8728_exit); 393 394 MODULE_DESCRIPTION("ASoC WM8728 driver"); 395 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 396 MODULE_LICENSE("GPL"); 397