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 <linux/slab.h> 22 #include <linux/of_device.h> 23 #include <sound/core.h> 24 #include <sound/pcm.h> 25 #include <sound/pcm_params.h> 26 #include <sound/soc.h> 27 #include <sound/initval.h> 28 #include <sound/tlv.h> 29 30 #include "wm8728.h" 31 32 /* 33 * We can't read the WM8728 register space so we cache them instead. 34 * Note that the defaults here aren't the physical defaults, we latch 35 * the volume update bits, mute the output and enable infinite zero 36 * detect. 37 */ 38 static const u16 wm8728_reg_defaults[] = { 39 0x1ff, 40 0x1ff, 41 0x001, 42 0x100, 43 }; 44 45 /* codec private data */ 46 struct wm8728_priv { 47 enum snd_soc_control_type control_type; 48 }; 49 50 static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1); 51 52 static const struct snd_kcontrol_new wm8728_snd_controls[] = { 53 54 SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL, 55 0, 255, 0, wm8728_tlv), 56 57 SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0), 58 }; 59 60 /* 61 * DAPM controls. 62 */ 63 static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = { 64 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0), 65 SND_SOC_DAPM_OUTPUT("VOUTL"), 66 SND_SOC_DAPM_OUTPUT("VOUTR"), 67 }; 68 69 static const struct snd_soc_dapm_route wm8728_intercon[] = { 70 {"VOUTL", NULL, "DAC"}, 71 {"VOUTR", NULL, "DAC"}, 72 }; 73 74 static int wm8728_mute(struct snd_soc_dai *dai, int mute) 75 { 76 struct snd_soc_codec *codec = dai->codec; 77 u16 mute_reg = snd_soc_read(codec, WM8728_DACCTL); 78 79 if (mute) 80 snd_soc_write(codec, WM8728_DACCTL, mute_reg | 1); 81 else 82 snd_soc_write(codec, WM8728_DACCTL, mute_reg & ~1); 83 84 return 0; 85 } 86 87 static int wm8728_hw_params(struct snd_pcm_substream *substream, 88 struct snd_pcm_hw_params *params, 89 struct snd_soc_dai *dai) 90 { 91 struct snd_soc_pcm_runtime *rtd = substream->private_data; 92 struct snd_soc_codec *codec = rtd->codec; 93 u16 dac = snd_soc_read(codec, WM8728_DACCTL); 94 95 dac &= ~0x18; 96 97 switch (params_format(params)) { 98 case SNDRV_PCM_FORMAT_S16_LE: 99 break; 100 case SNDRV_PCM_FORMAT_S20_3LE: 101 dac |= 0x10; 102 break; 103 case SNDRV_PCM_FORMAT_S24_LE: 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 u16 reg; 167 int i; 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 for (i = 0; i < ARRAY_SIZE(wm8728_reg_defaults); i++) 180 snd_soc_write(codec, i, 181 snd_soc_read(codec, i)); 182 } 183 break; 184 185 case SND_SOC_BIAS_OFF: 186 reg = snd_soc_read(codec, WM8728_DACCTL); 187 snd_soc_write(codec, WM8728_DACCTL, reg | 0x4); 188 break; 189 } 190 codec->dapm.bias_level = level; 191 return 0; 192 } 193 194 #define WM8728_RATES (SNDRV_PCM_RATE_8000_192000) 195 196 #define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\ 197 SNDRV_PCM_FMTBIT_S24_LE) 198 199 static struct snd_soc_dai_ops wm8728_dai_ops = { 200 .hw_params = wm8728_hw_params, 201 .digital_mute = wm8728_mute, 202 .set_fmt = wm8728_set_dai_fmt, 203 }; 204 205 static struct snd_soc_dai_driver wm8728_dai = { 206 .name = "wm8728-hifi", 207 .playback = { 208 .stream_name = "Playback", 209 .channels_min = 2, 210 .channels_max = 2, 211 .rates = WM8728_RATES, 212 .formats = WM8728_FORMATS, 213 }, 214 .ops = &wm8728_dai_ops, 215 }; 216 217 static int wm8728_suspend(struct snd_soc_codec *codec, pm_message_t state) 218 { 219 wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF); 220 221 return 0; 222 } 223 224 static int wm8728_resume(struct snd_soc_codec *codec) 225 { 226 wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY); 227 228 return 0; 229 } 230 231 static int wm8728_probe(struct snd_soc_codec *codec) 232 { 233 struct wm8728_priv *wm8728 = snd_soc_codec_get_drvdata(codec); 234 int ret; 235 236 ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8728->control_type); 237 if (ret < 0) { 238 printk(KERN_ERR "wm8728: failed to configure cache I/O: %d\n", 239 ret); 240 return ret; 241 } 242 243 /* power on device */ 244 wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY); 245 246 snd_soc_add_controls(codec, wm8728_snd_controls, 247 ARRAY_SIZE(wm8728_snd_controls)); 248 249 return ret; 250 } 251 252 static int wm8728_remove(struct snd_soc_codec *codec) 253 { 254 wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF); 255 return 0; 256 } 257 258 static struct snd_soc_codec_driver soc_codec_dev_wm8728 = { 259 .probe = wm8728_probe, 260 .remove = wm8728_remove, 261 .suspend = wm8728_suspend, 262 .resume = wm8728_resume, 263 .set_bias_level = wm8728_set_bias_level, 264 .reg_cache_size = ARRAY_SIZE(wm8728_reg_defaults), 265 .reg_word_size = sizeof(u16), 266 .reg_cache_default = wm8728_reg_defaults, 267 .dapm_widgets = wm8728_dapm_widgets, 268 .num_dapm_widgets = ARRAY_SIZE(wm8728_dapm_widgets), 269 .dapm_routes = wm8728_intercon, 270 .num_dapm_routes = ARRAY_SIZE(wm8728_intercon), 271 }; 272 273 static const struct of_device_id wm8728_of_match[] = { 274 { .compatible = "wlf,wm8728", }, 275 { } 276 }; 277 MODULE_DEVICE_TABLE(of, wm8728_of_match); 278 279 #if defined(CONFIG_SPI_MASTER) 280 static int __devinit wm8728_spi_probe(struct spi_device *spi) 281 { 282 struct wm8728_priv *wm8728; 283 int ret; 284 285 wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL); 286 if (wm8728 == NULL) 287 return -ENOMEM; 288 289 wm8728->control_type = SND_SOC_SPI; 290 spi_set_drvdata(spi, wm8728); 291 292 ret = snd_soc_register_codec(&spi->dev, 293 &soc_codec_dev_wm8728, &wm8728_dai, 1); 294 if (ret < 0) 295 kfree(wm8728); 296 return ret; 297 } 298 299 static int __devexit wm8728_spi_remove(struct spi_device *spi) 300 { 301 snd_soc_unregister_codec(&spi->dev); 302 kfree(spi_get_drvdata(spi)); 303 return 0; 304 } 305 306 static struct spi_driver wm8728_spi_driver = { 307 .driver = { 308 .name = "wm8728", 309 .owner = THIS_MODULE, 310 .of_match_table = wm8728_of_match, 311 }, 312 .probe = wm8728_spi_probe, 313 .remove = __devexit_p(wm8728_spi_remove), 314 }; 315 #endif /* CONFIG_SPI_MASTER */ 316 317 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 318 static __devinit int wm8728_i2c_probe(struct i2c_client *i2c, 319 const struct i2c_device_id *id) 320 { 321 struct wm8728_priv *wm8728; 322 int ret; 323 324 wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL); 325 if (wm8728 == NULL) 326 return -ENOMEM; 327 328 i2c_set_clientdata(i2c, wm8728); 329 wm8728->control_type = SND_SOC_I2C; 330 331 ret = snd_soc_register_codec(&i2c->dev, 332 &soc_codec_dev_wm8728, &wm8728_dai, 1); 333 if (ret < 0) 334 kfree(wm8728); 335 return ret; 336 } 337 338 static __devexit int wm8728_i2c_remove(struct i2c_client *client) 339 { 340 snd_soc_unregister_codec(&client->dev); 341 kfree(i2c_get_clientdata(client)); 342 return 0; 343 } 344 345 static const struct i2c_device_id wm8728_i2c_id[] = { 346 { "wm8728", 0 }, 347 { } 348 }; 349 MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id); 350 351 static struct i2c_driver wm8728_i2c_driver = { 352 .driver = { 353 .name = "wm8728", 354 .owner = THIS_MODULE, 355 .of_match_table = wm8728_of_match, 356 }, 357 .probe = wm8728_i2c_probe, 358 .remove = __devexit_p(wm8728_i2c_remove), 359 .id_table = wm8728_i2c_id, 360 }; 361 #endif 362 363 static int __init wm8728_modinit(void) 364 { 365 int ret = 0; 366 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 367 ret = i2c_add_driver(&wm8728_i2c_driver); 368 if (ret != 0) { 369 printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n", 370 ret); 371 } 372 #endif 373 #if defined(CONFIG_SPI_MASTER) 374 ret = spi_register_driver(&wm8728_spi_driver); 375 if (ret != 0) { 376 printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n", 377 ret); 378 } 379 #endif 380 return ret; 381 } 382 module_init(wm8728_modinit); 383 384 static void __exit wm8728_exit(void) 385 { 386 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 387 i2c_del_driver(&wm8728_i2c_driver); 388 #endif 389 #if defined(CONFIG_SPI_MASTER) 390 spi_unregister_driver(&wm8728_spi_driver); 391 #endif 392 } 393 module_exit(wm8728_exit); 394 395 MODULE_DESCRIPTION("ASoC WM8728 driver"); 396 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 397 MODULE_LICENSE("GPL"); 398