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 (snd_soc_codec_get_bias_level(codec) == 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 return 0; 189 } 190 191 #define WM8728_RATES (SNDRV_PCM_RATE_8000_192000) 192 193 #define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\ 194 SNDRV_PCM_FMTBIT_S24_LE) 195 196 static const struct snd_soc_dai_ops wm8728_dai_ops = { 197 .hw_params = wm8728_hw_params, 198 .digital_mute = wm8728_mute, 199 .set_fmt = wm8728_set_dai_fmt, 200 }; 201 202 static struct snd_soc_dai_driver wm8728_dai = { 203 .name = "wm8728-hifi", 204 .playback = { 205 .stream_name = "Playback", 206 .channels_min = 2, 207 .channels_max = 2, 208 .rates = WM8728_RATES, 209 .formats = WM8728_FORMATS, 210 }, 211 .ops = &wm8728_dai_ops, 212 }; 213 214 static struct snd_soc_codec_driver soc_codec_dev_wm8728 = { 215 .set_bias_level = wm8728_set_bias_level, 216 .suspend_bias_off = true, 217 218 .controls = wm8728_snd_controls, 219 .num_controls = ARRAY_SIZE(wm8728_snd_controls), 220 .dapm_widgets = wm8728_dapm_widgets, 221 .num_dapm_widgets = ARRAY_SIZE(wm8728_dapm_widgets), 222 .dapm_routes = wm8728_intercon, 223 .num_dapm_routes = ARRAY_SIZE(wm8728_intercon), 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 = snd_soc_register_codec(&spi->dev, 260 &soc_codec_dev_wm8728, &wm8728_dai, 1); 261 262 return ret; 263 } 264 265 static int wm8728_spi_remove(struct spi_device *spi) 266 { 267 snd_soc_unregister_codec(&spi->dev); 268 269 return 0; 270 } 271 272 static struct spi_driver wm8728_spi_driver = { 273 .driver = { 274 .name = "wm8728", 275 .of_match_table = wm8728_of_match, 276 }, 277 .probe = wm8728_spi_probe, 278 .remove = wm8728_spi_remove, 279 }; 280 #endif /* CONFIG_SPI_MASTER */ 281 282 #if IS_ENABLED(CONFIG_I2C) 283 static int wm8728_i2c_probe(struct i2c_client *i2c, 284 const struct i2c_device_id *id) 285 { 286 struct wm8728_priv *wm8728; 287 int ret; 288 289 wm8728 = devm_kzalloc(&i2c->dev, sizeof(struct wm8728_priv), 290 GFP_KERNEL); 291 if (wm8728 == NULL) 292 return -ENOMEM; 293 294 wm8728->regmap = devm_regmap_init_i2c(i2c, &wm8728_regmap); 295 if (IS_ERR(wm8728->regmap)) 296 return PTR_ERR(wm8728->regmap); 297 298 i2c_set_clientdata(i2c, wm8728); 299 300 ret = snd_soc_register_codec(&i2c->dev, 301 &soc_codec_dev_wm8728, &wm8728_dai, 1); 302 303 return ret; 304 } 305 306 static int wm8728_i2c_remove(struct i2c_client *client) 307 { 308 snd_soc_unregister_codec(&client->dev); 309 return 0; 310 } 311 312 static const struct i2c_device_id wm8728_i2c_id[] = { 313 { "wm8728", 0 }, 314 { } 315 }; 316 MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id); 317 318 static struct i2c_driver wm8728_i2c_driver = { 319 .driver = { 320 .name = "wm8728", 321 .of_match_table = wm8728_of_match, 322 }, 323 .probe = wm8728_i2c_probe, 324 .remove = wm8728_i2c_remove, 325 .id_table = wm8728_i2c_id, 326 }; 327 #endif 328 329 static int __init wm8728_modinit(void) 330 { 331 int ret = 0; 332 #if IS_ENABLED(CONFIG_I2C) 333 ret = i2c_add_driver(&wm8728_i2c_driver); 334 if (ret != 0) { 335 printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n", 336 ret); 337 } 338 #endif 339 #if defined(CONFIG_SPI_MASTER) 340 ret = spi_register_driver(&wm8728_spi_driver); 341 if (ret != 0) { 342 printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n", 343 ret); 344 } 345 #endif 346 return ret; 347 } 348 module_init(wm8728_modinit); 349 350 static void __exit wm8728_exit(void) 351 { 352 #if IS_ENABLED(CONFIG_I2C) 353 i2c_del_driver(&wm8728_i2c_driver); 354 #endif 355 #if defined(CONFIG_SPI_MASTER) 356 spi_unregister_driver(&wm8728_spi_driver); 357 #endif 358 } 359 module_exit(wm8728_exit); 360 361 MODULE_DESCRIPTION("ASoC WM8728 driver"); 362 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 363 MODULE_LICENSE("GPL"); 364