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/spi/spi.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/soc-dapm.h> 26 #include <sound/initval.h> 27 #include <sound/tlv.h> 28 29 #include "wm8728.h" 30 31 struct snd_soc_codec_device soc_codec_dev_wm8728; 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 u16 wm8728_reg_defaults[] = { 40 0x1ff, 41 0x1ff, 42 0x001, 43 0x100, 44 }; 45 46 static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1); 47 48 static const struct snd_kcontrol_new wm8728_snd_controls[] = { 49 50 SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL, 51 0, 255, 0, wm8728_tlv), 52 53 SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0), 54 }; 55 56 /* 57 * DAPM controls. 58 */ 59 static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = { 60 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0), 61 SND_SOC_DAPM_OUTPUT("VOUTL"), 62 SND_SOC_DAPM_OUTPUT("VOUTR"), 63 }; 64 65 static const struct snd_soc_dapm_route intercon[] = { 66 {"VOUTL", NULL, "DAC"}, 67 {"VOUTR", NULL, "DAC"}, 68 }; 69 70 static int wm8728_add_widgets(struct snd_soc_codec *codec) 71 { 72 snd_soc_dapm_new_controls(codec, wm8728_dapm_widgets, 73 ARRAY_SIZE(wm8728_dapm_widgets)); 74 75 snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon)); 76 77 return 0; 78 } 79 80 static int wm8728_mute(struct snd_soc_dai *dai, int mute) 81 { 82 struct snd_soc_codec *codec = dai->codec; 83 u16 mute_reg = snd_soc_read(codec, WM8728_DACCTL); 84 85 if (mute) 86 snd_soc_write(codec, WM8728_DACCTL, mute_reg | 1); 87 else 88 snd_soc_write(codec, WM8728_DACCTL, mute_reg & ~1); 89 90 return 0; 91 } 92 93 static int wm8728_hw_params(struct snd_pcm_substream *substream, 94 struct snd_pcm_hw_params *params, 95 struct snd_soc_dai *dai) 96 { 97 struct snd_soc_pcm_runtime *rtd = substream->private_data; 98 struct snd_soc_device *socdev = rtd->socdev; 99 struct snd_soc_codec *codec = socdev->card->codec; 100 u16 dac = snd_soc_read(codec, WM8728_DACCTL); 101 102 dac &= ~0x18; 103 104 switch (params_format(params)) { 105 case SNDRV_PCM_FORMAT_S16_LE: 106 break; 107 case SNDRV_PCM_FORMAT_S20_3LE: 108 dac |= 0x10; 109 break; 110 case SNDRV_PCM_FORMAT_S24_LE: 111 dac |= 0x08; 112 break; 113 default: 114 return -EINVAL; 115 } 116 117 snd_soc_write(codec, WM8728_DACCTL, dac); 118 119 return 0; 120 } 121 122 static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai, 123 unsigned int fmt) 124 { 125 struct snd_soc_codec *codec = codec_dai->codec; 126 u16 iface = snd_soc_read(codec, WM8728_IFCTL); 127 128 /* Currently only I2S is supported by the driver, though the 129 * hardware is more flexible. 130 */ 131 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 132 case SND_SOC_DAIFMT_I2S: 133 iface |= 1; 134 break; 135 default: 136 return -EINVAL; 137 } 138 139 /* The hardware only support full slave mode */ 140 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { 141 case SND_SOC_DAIFMT_CBS_CFS: 142 break; 143 default: 144 return -EINVAL; 145 } 146 147 switch (fmt & SND_SOC_DAIFMT_INV_MASK) { 148 case SND_SOC_DAIFMT_NB_NF: 149 iface &= ~0x22; 150 break; 151 case SND_SOC_DAIFMT_IB_NF: 152 iface |= 0x20; 153 iface &= ~0x02; 154 break; 155 case SND_SOC_DAIFMT_NB_IF: 156 iface |= 0x02; 157 iface &= ~0x20; 158 break; 159 case SND_SOC_DAIFMT_IB_IF: 160 iface |= 0x22; 161 break; 162 default: 163 return -EINVAL; 164 } 165 166 snd_soc_write(codec, WM8728_IFCTL, iface); 167 return 0; 168 } 169 170 static int wm8728_set_bias_level(struct snd_soc_codec *codec, 171 enum snd_soc_bias_level level) 172 { 173 u16 reg; 174 int i; 175 176 switch (level) { 177 case SND_SOC_BIAS_ON: 178 case SND_SOC_BIAS_PREPARE: 179 case SND_SOC_BIAS_STANDBY: 180 if (codec->bias_level == SND_SOC_BIAS_OFF) { 181 /* Power everything up... */ 182 reg = snd_soc_read(codec, WM8728_DACCTL); 183 snd_soc_write(codec, WM8728_DACCTL, reg & ~0x4); 184 185 /* ..then sync in the register cache. */ 186 for (i = 0; i < ARRAY_SIZE(wm8728_reg_defaults); i++) 187 snd_soc_write(codec, i, 188 snd_soc_read(codec, i)); 189 } 190 break; 191 192 case SND_SOC_BIAS_OFF: 193 reg = snd_soc_read(codec, WM8728_DACCTL); 194 snd_soc_write(codec, WM8728_DACCTL, reg | 0x4); 195 break; 196 } 197 codec->bias_level = level; 198 return 0; 199 } 200 201 #define WM8728_RATES (SNDRV_PCM_RATE_8000_192000) 202 203 #define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\ 204 SNDRV_PCM_FMTBIT_S24_LE) 205 206 static struct snd_soc_dai_ops wm8728_dai_ops = { 207 .hw_params = wm8728_hw_params, 208 .digital_mute = wm8728_mute, 209 .set_fmt = wm8728_set_dai_fmt, 210 }; 211 212 struct snd_soc_dai wm8728_dai = { 213 .name = "WM8728", 214 .playback = { 215 .stream_name = "Playback", 216 .channels_min = 2, 217 .channels_max = 2, 218 .rates = WM8728_RATES, 219 .formats = WM8728_FORMATS, 220 }, 221 .ops = &wm8728_dai_ops, 222 }; 223 EXPORT_SYMBOL_GPL(wm8728_dai); 224 225 static int wm8728_suspend(struct platform_device *pdev, pm_message_t state) 226 { 227 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 228 struct snd_soc_codec *codec = socdev->card->codec; 229 230 wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF); 231 232 return 0; 233 } 234 235 static int wm8728_resume(struct platform_device *pdev) 236 { 237 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 238 struct snd_soc_codec *codec = socdev->card->codec; 239 240 wm8728_set_bias_level(codec, codec->suspend_bias_level); 241 242 return 0; 243 } 244 245 /* 246 * initialise the WM8728 driver 247 * register the mixer and dsp interfaces with the kernel 248 */ 249 static int wm8728_init(struct snd_soc_device *socdev, 250 enum snd_soc_control_type control) 251 { 252 struct snd_soc_codec *codec = socdev->card->codec; 253 int ret = 0; 254 255 codec->name = "WM8728"; 256 codec->owner = THIS_MODULE; 257 codec->set_bias_level = wm8728_set_bias_level; 258 codec->dai = &wm8728_dai; 259 codec->num_dai = 1; 260 codec->bias_level = SND_SOC_BIAS_OFF; 261 codec->reg_cache_size = ARRAY_SIZE(wm8728_reg_defaults); 262 codec->reg_cache = kmemdup(wm8728_reg_defaults, 263 sizeof(wm8728_reg_defaults), 264 GFP_KERNEL); 265 if (codec->reg_cache == NULL) 266 return -ENOMEM; 267 268 ret = snd_soc_codec_set_cache_io(codec, 7, 9, control); 269 if (ret < 0) { 270 printk(KERN_ERR "wm8728: failed to configure cache I/O: %d\n", 271 ret); 272 goto err; 273 } 274 275 /* register pcms */ 276 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); 277 if (ret < 0) { 278 printk(KERN_ERR "wm8728: failed to create pcms\n"); 279 goto err; 280 } 281 282 /* power on device */ 283 wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY); 284 285 snd_soc_add_controls(codec, wm8728_snd_controls, 286 ARRAY_SIZE(wm8728_snd_controls)); 287 wm8728_add_widgets(codec); 288 289 return ret; 290 291 err: 292 kfree(codec->reg_cache); 293 return ret; 294 } 295 296 static struct snd_soc_device *wm8728_socdev; 297 298 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 299 300 /* 301 * WM8728 2 wire address is determined by GPIO5 302 * state during powerup. 303 * low = 0x1a 304 * high = 0x1b 305 */ 306 307 static int wm8728_i2c_probe(struct i2c_client *i2c, 308 const struct i2c_device_id *id) 309 { 310 struct snd_soc_device *socdev = wm8728_socdev; 311 struct snd_soc_codec *codec = socdev->card->codec; 312 int ret; 313 314 i2c_set_clientdata(i2c, codec); 315 codec->control_data = i2c; 316 317 ret = wm8728_init(socdev, SND_SOC_I2C); 318 if (ret < 0) 319 pr_err("failed to initialise WM8728\n"); 320 321 return ret; 322 } 323 324 static int wm8728_i2c_remove(struct i2c_client *client) 325 { 326 struct snd_soc_codec *codec = i2c_get_clientdata(client); 327 kfree(codec->reg_cache); 328 return 0; 329 } 330 331 static const struct i2c_device_id wm8728_i2c_id[] = { 332 { "wm8728", 0 }, 333 { } 334 }; 335 MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id); 336 337 static struct i2c_driver wm8728_i2c_driver = { 338 .driver = { 339 .name = "WM8728 I2C Codec", 340 .owner = THIS_MODULE, 341 }, 342 .probe = wm8728_i2c_probe, 343 .remove = wm8728_i2c_remove, 344 .id_table = wm8728_i2c_id, 345 }; 346 347 static int wm8728_add_i2c_device(struct platform_device *pdev, 348 const struct wm8728_setup_data *setup) 349 { 350 struct i2c_board_info info; 351 struct i2c_adapter *adapter; 352 struct i2c_client *client; 353 int ret; 354 355 ret = i2c_add_driver(&wm8728_i2c_driver); 356 if (ret != 0) { 357 dev_err(&pdev->dev, "can't add i2c driver\n"); 358 return ret; 359 } 360 361 memset(&info, 0, sizeof(struct i2c_board_info)); 362 info.addr = setup->i2c_address; 363 strlcpy(info.type, "wm8728", I2C_NAME_SIZE); 364 365 adapter = i2c_get_adapter(setup->i2c_bus); 366 if (!adapter) { 367 dev_err(&pdev->dev, "can't get i2c adapter %d\n", 368 setup->i2c_bus); 369 goto err_driver; 370 } 371 372 client = i2c_new_device(adapter, &info); 373 i2c_put_adapter(adapter); 374 if (!client) { 375 dev_err(&pdev->dev, "can't add i2c device at 0x%x\n", 376 (unsigned int)info.addr); 377 goto err_driver; 378 } 379 380 return 0; 381 382 err_driver: 383 i2c_del_driver(&wm8728_i2c_driver); 384 return -ENODEV; 385 } 386 #endif 387 388 #if defined(CONFIG_SPI_MASTER) 389 static int __devinit wm8728_spi_probe(struct spi_device *spi) 390 { 391 struct snd_soc_device *socdev = wm8728_socdev; 392 struct snd_soc_codec *codec = socdev->card->codec; 393 int ret; 394 395 codec->control_data = spi; 396 397 ret = wm8728_init(socdev, SND_SOC_SPI); 398 if (ret < 0) 399 dev_err(&spi->dev, "failed to initialise WM8728\n"); 400 401 return ret; 402 } 403 404 static int __devexit wm8728_spi_remove(struct spi_device *spi) 405 { 406 return 0; 407 } 408 409 static struct spi_driver wm8728_spi_driver = { 410 .driver = { 411 .name = "wm8728", 412 .bus = &spi_bus_type, 413 .owner = THIS_MODULE, 414 }, 415 .probe = wm8728_spi_probe, 416 .remove = __devexit_p(wm8728_spi_remove), 417 }; 418 #endif /* CONFIG_SPI_MASTER */ 419 420 static int wm8728_probe(struct platform_device *pdev) 421 { 422 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 423 struct wm8728_setup_data *setup; 424 struct snd_soc_codec *codec; 425 int ret = 0; 426 427 setup = socdev->codec_data; 428 codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL); 429 if (codec == NULL) 430 return -ENOMEM; 431 432 socdev->card->codec = codec; 433 mutex_init(&codec->mutex); 434 INIT_LIST_HEAD(&codec->dapm_widgets); 435 INIT_LIST_HEAD(&codec->dapm_paths); 436 437 wm8728_socdev = socdev; 438 ret = -ENODEV; 439 440 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 441 if (setup->i2c_address) { 442 ret = wm8728_add_i2c_device(pdev, setup); 443 } 444 #endif 445 #if defined(CONFIG_SPI_MASTER) 446 if (setup->spi) { 447 ret = spi_register_driver(&wm8728_spi_driver); 448 if (ret != 0) 449 printk(KERN_ERR "can't add spi driver"); 450 } 451 #endif 452 453 if (ret != 0) 454 kfree(codec); 455 456 return ret; 457 } 458 459 /* power down chip */ 460 static int wm8728_remove(struct platform_device *pdev) 461 { 462 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 463 struct snd_soc_codec *codec = socdev->card->codec; 464 465 if (codec->control_data) 466 wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF); 467 468 snd_soc_free_pcms(socdev); 469 snd_soc_dapm_free(socdev); 470 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 471 i2c_unregister_device(codec->control_data); 472 i2c_del_driver(&wm8728_i2c_driver); 473 #endif 474 #if defined(CONFIG_SPI_MASTER) 475 spi_unregister_driver(&wm8728_spi_driver); 476 #endif 477 kfree(codec); 478 479 return 0; 480 } 481 482 struct snd_soc_codec_device soc_codec_dev_wm8728 = { 483 .probe = wm8728_probe, 484 .remove = wm8728_remove, 485 .suspend = wm8728_suspend, 486 .resume = wm8728_resume, 487 }; 488 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8728); 489 490 static int __init wm8728_modinit(void) 491 { 492 return snd_soc_register_dai(&wm8728_dai); 493 } 494 module_init(wm8728_modinit); 495 496 static void __exit wm8728_exit(void) 497 { 498 snd_soc_unregister_dai(&wm8728_dai); 499 } 500 module_exit(wm8728_exit); 501 502 MODULE_DESCRIPTION("ASoC WM8728 driver"); 503 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 504 MODULE_LICENSE("GPL"); 505