| 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 | .owner = THIS_MODULE, |
| 276 | .of_match_table = wm8728_of_match, |
| 277 | }, |
| 278 | .probe = wm8728_spi_probe, |
| 279 | .remove = wm8728_spi_remove, |
| 280 | }; |
| 281 | #endif /* CONFIG_SPI_MASTER */ |
| 282 | |
| 283 | #if IS_ENABLED(CONFIG_I2C) |
| 284 | static int wm8728_i2c_probe(struct i2c_client *i2c, |
| 285 | const struct i2c_device_id *id) |
| 286 | { |
| 287 | struct wm8728_priv *wm8728; |
| 288 | int ret; |
| 289 | |
| 290 | wm8728 = devm_kzalloc(&i2c->dev, sizeof(struct wm8728_priv), |
| 291 | GFP_KERNEL); |
| 292 | if (wm8728 == NULL) |
| 293 | return -ENOMEM; |
| 294 | |
| 295 | wm8728->regmap = devm_regmap_init_i2c(i2c, &wm8728_regmap); |
| 296 | if (IS_ERR(wm8728->regmap)) |
| 297 | return PTR_ERR(wm8728->regmap); |
| 298 | |
| 299 | i2c_set_clientdata(i2c, wm8728); |
| 300 | |
| 301 | ret = snd_soc_register_codec(&i2c->dev, |
| 302 | &soc_codec_dev_wm8728, &wm8728_dai, 1); |
| 303 | |
| 304 | return ret; |
| 305 | } |
| 306 | |
| 307 | static int wm8728_i2c_remove(struct i2c_client *client) |
| 308 | { |
| 309 | snd_soc_unregister_codec(&client->dev); |
| 310 | return 0; |
| 311 | } |
| 312 | |
| 313 | static const struct i2c_device_id wm8728_i2c_id[] = { |
| 314 | { "wm8728", 0 }, |
| 315 | { } |
| 316 | }; |
| 317 | MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id); |
| 318 | |
| 319 | static struct i2c_driver wm8728_i2c_driver = { |
| 320 | .driver = { |
| 321 | .name = "wm8728", |
| 322 | .of_match_table = wm8728_of_match, |
| 323 | }, |
| 324 | .probe = wm8728_i2c_probe, |
| 325 | .remove = wm8728_i2c_remove, |
| 326 | .id_table = wm8728_i2c_id, |
| 327 | }; |
| 328 | #endif |
| 329 | |
| 330 | static int __init wm8728_modinit(void) |
| 331 | { |
| 332 | int ret = 0; |
| 333 | #if IS_ENABLED(CONFIG_I2C) |
| 334 | ret = i2c_add_driver(&wm8728_i2c_driver); |
| 335 | if (ret != 0) { |
| 336 | printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n", |
| 337 | ret); |
| 338 | } |
| 339 | #endif |
| 340 | #if defined(CONFIG_SPI_MASTER) |
| 341 | ret = spi_register_driver(&wm8728_spi_driver); |
| 342 | if (ret != 0) { |
| 343 | printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n", |
| 344 | ret); |
| 345 | } |
| 346 | #endif |
| 347 | return ret; |
| 348 | } |
| 349 | module_init(wm8728_modinit); |
| 350 | |
| 351 | static void __exit wm8728_exit(void) |
| 352 | { |
| 353 | #if IS_ENABLED(CONFIG_I2C) |
| 354 | i2c_del_driver(&wm8728_i2c_driver); |
| 355 | #endif |
| 356 | #if defined(CONFIG_SPI_MASTER) |
| 357 | spi_unregister_driver(&wm8728_spi_driver); |
| 358 | #endif |
| 359 | } |
| 360 | module_exit(wm8728_exit); |
| 361 | |
| 362 | MODULE_DESCRIPTION("ASoC WM8728 driver"); |
| 363 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); |
| 364 | MODULE_LICENSE("GPL"); |