1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * wm8728.c -- WM8728 ALSA SoC Audio driver 4 * 5 * Copyright 2008 Wolfson Microelectronics plc 6 * 7 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 8 */ 9 10 #include <linux/module.h> 11 #include <linux/moduleparam.h> 12 #include <linux/init.h> 13 #include <linux/delay.h> 14 #include <linux/pm.h> 15 #include <linux/i2c.h> 16 #include <linux/platform_device.h> 17 #include <linux/regmap.h> 18 #include <linux/spi/spi.h> 19 #include <linux/slab.h> 20 #include <linux/of_device.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/initval.h> 26 #include <sound/tlv.h> 27 28 #include "wm8728.h" 29 30 /* 31 * We can't read the WM8728 register space so we cache them instead. 32 * Note that the defaults here aren't the physical defaults, we latch 33 * the volume update bits, mute the output and enable infinite zero 34 * detect. 35 */ 36 static const struct reg_default wm8728_reg_defaults[] = { 37 { 0, 0x1ff }, 38 { 1, 0x1ff }, 39 { 2, 0x001 }, 40 { 3, 0x100 }, 41 }; 42 43 /* codec private data */ 44 struct wm8728_priv { 45 struct regmap *regmap; 46 }; 47 48 static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1); 49 50 static const struct snd_kcontrol_new wm8728_snd_controls[] = { 51 52 SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL, 53 0, 255, 0, wm8728_tlv), 54 55 SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0), 56 }; 57 58 /* 59 * DAPM controls. 60 */ 61 static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = { 62 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0), 63 SND_SOC_DAPM_OUTPUT("VOUTL"), 64 SND_SOC_DAPM_OUTPUT("VOUTR"), 65 }; 66 67 static const struct snd_soc_dapm_route wm8728_intercon[] = { 68 {"VOUTL", NULL, "DAC"}, 69 {"VOUTR", NULL, "DAC"}, 70 }; 71 72 static int wm8728_mute(struct snd_soc_dai *dai, int mute, int direction) 73 { 74 struct snd_soc_component *component = dai->component; 75 u16 mute_reg = snd_soc_component_read(component, WM8728_DACCTL); 76 77 if (mute) 78 snd_soc_component_write(component, WM8728_DACCTL, mute_reg | 1); 79 else 80 snd_soc_component_write(component, WM8728_DACCTL, mute_reg & ~1); 81 82 return 0; 83 } 84 85 static int wm8728_hw_params(struct snd_pcm_substream *substream, 86 struct snd_pcm_hw_params *params, 87 struct snd_soc_dai *dai) 88 { 89 struct snd_soc_component *component = dai->component; 90 u16 dac = snd_soc_component_read(component, WM8728_DACCTL); 91 92 dac &= ~0x18; 93 94 switch (params_width(params)) { 95 case 16: 96 break; 97 case 20: 98 dac |= 0x10; 99 break; 100 case 24: 101 dac |= 0x08; 102 break; 103 default: 104 return -EINVAL; 105 } 106 107 snd_soc_component_write(component, WM8728_DACCTL, dac); 108 109 return 0; 110 } 111 112 static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai, 113 unsigned int fmt) 114 { 115 struct snd_soc_component *component = codec_dai->component; 116 u16 iface = snd_soc_component_read(component, WM8728_IFCTL); 117 118 /* Currently only I2S is supported by the driver, though the 119 * hardware is more flexible. 120 */ 121 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 122 case SND_SOC_DAIFMT_I2S: 123 iface |= 1; 124 break; 125 default: 126 return -EINVAL; 127 } 128 129 /* The hardware only support full slave mode */ 130 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { 131 case SND_SOC_DAIFMT_CBS_CFS: 132 break; 133 default: 134 return -EINVAL; 135 } 136 137 switch (fmt & SND_SOC_DAIFMT_INV_MASK) { 138 case SND_SOC_DAIFMT_NB_NF: 139 iface &= ~0x22; 140 break; 141 case SND_SOC_DAIFMT_IB_NF: 142 iface |= 0x20; 143 iface &= ~0x02; 144 break; 145 case SND_SOC_DAIFMT_NB_IF: 146 iface |= 0x02; 147 iface &= ~0x20; 148 break; 149 case SND_SOC_DAIFMT_IB_IF: 150 iface |= 0x22; 151 break; 152 default: 153 return -EINVAL; 154 } 155 156 snd_soc_component_write(component, WM8728_IFCTL, iface); 157 return 0; 158 } 159 160 static int wm8728_set_bias_level(struct snd_soc_component *component, 161 enum snd_soc_bias_level level) 162 { 163 struct wm8728_priv *wm8728 = snd_soc_component_get_drvdata(component); 164 u16 reg; 165 166 switch (level) { 167 case SND_SOC_BIAS_ON: 168 case SND_SOC_BIAS_PREPARE: 169 case SND_SOC_BIAS_STANDBY: 170 if (snd_soc_component_get_bias_level(component) == SND_SOC_BIAS_OFF) { 171 /* Power everything up... */ 172 reg = snd_soc_component_read(component, WM8728_DACCTL); 173 snd_soc_component_write(component, WM8728_DACCTL, reg & ~0x4); 174 175 /* ..then sync in the register cache. */ 176 regcache_sync(wm8728->regmap); 177 } 178 break; 179 180 case SND_SOC_BIAS_OFF: 181 reg = snd_soc_component_read(component, WM8728_DACCTL); 182 snd_soc_component_write(component, WM8728_DACCTL, reg | 0x4); 183 break; 184 } 185 return 0; 186 } 187 188 #define WM8728_RATES (SNDRV_PCM_RATE_8000_192000) 189 190 #define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\ 191 SNDRV_PCM_FMTBIT_S24_LE) 192 193 static const struct snd_soc_dai_ops wm8728_dai_ops = { 194 .hw_params = wm8728_hw_params, 195 .mute_stream = wm8728_mute, 196 .set_fmt = wm8728_set_dai_fmt, 197 .no_capture_mute = 1, 198 }; 199 200 static struct snd_soc_dai_driver wm8728_dai = { 201 .name = "wm8728-hifi", 202 .playback = { 203 .stream_name = "Playback", 204 .channels_min = 2, 205 .channels_max = 2, 206 .rates = WM8728_RATES, 207 .formats = WM8728_FORMATS, 208 }, 209 .ops = &wm8728_dai_ops, 210 }; 211 212 static const struct snd_soc_component_driver soc_component_dev_wm8728 = { 213 .set_bias_level = wm8728_set_bias_level, 214 .controls = wm8728_snd_controls, 215 .num_controls = ARRAY_SIZE(wm8728_snd_controls), 216 .dapm_widgets = wm8728_dapm_widgets, 217 .num_dapm_widgets = ARRAY_SIZE(wm8728_dapm_widgets), 218 .dapm_routes = wm8728_intercon, 219 .num_dapm_routes = ARRAY_SIZE(wm8728_intercon), 220 .suspend_bias_off = 1, 221 .idle_bias_on = 1, 222 .use_pmdown_time = 1, 223 .endianness = 1, 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 = devm_snd_soc_register_component(&spi->dev, 260 &soc_component_dev_wm8728, &wm8728_dai, 1); 261 262 return ret; 263 } 264 265 static struct spi_driver wm8728_spi_driver = { 266 .driver = { 267 .name = "wm8728", 268 .of_match_table = wm8728_of_match, 269 }, 270 .probe = wm8728_spi_probe, 271 }; 272 #endif /* CONFIG_SPI_MASTER */ 273 274 #if IS_ENABLED(CONFIG_I2C) 275 static int wm8728_i2c_probe(struct i2c_client *i2c) 276 { 277 struct wm8728_priv *wm8728; 278 int ret; 279 280 wm8728 = devm_kzalloc(&i2c->dev, sizeof(struct wm8728_priv), 281 GFP_KERNEL); 282 if (wm8728 == NULL) 283 return -ENOMEM; 284 285 wm8728->regmap = devm_regmap_init_i2c(i2c, &wm8728_regmap); 286 if (IS_ERR(wm8728->regmap)) 287 return PTR_ERR(wm8728->regmap); 288 289 i2c_set_clientdata(i2c, wm8728); 290 291 ret = devm_snd_soc_register_component(&i2c->dev, 292 &soc_component_dev_wm8728, &wm8728_dai, 1); 293 294 return ret; 295 } 296 297 static const struct i2c_device_id wm8728_i2c_id[] = { 298 { "wm8728", 0 }, 299 { } 300 }; 301 MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id); 302 303 static struct i2c_driver wm8728_i2c_driver = { 304 .driver = { 305 .name = "wm8728", 306 .of_match_table = wm8728_of_match, 307 }, 308 .probe_new = wm8728_i2c_probe, 309 .id_table = wm8728_i2c_id, 310 }; 311 #endif 312 313 static int __init wm8728_modinit(void) 314 { 315 int ret = 0; 316 #if IS_ENABLED(CONFIG_I2C) 317 ret = i2c_add_driver(&wm8728_i2c_driver); 318 if (ret != 0) { 319 printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n", 320 ret); 321 } 322 #endif 323 #if defined(CONFIG_SPI_MASTER) 324 ret = spi_register_driver(&wm8728_spi_driver); 325 if (ret != 0) { 326 printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n", 327 ret); 328 } 329 #endif 330 return ret; 331 } 332 module_init(wm8728_modinit); 333 334 static void __exit wm8728_exit(void) 335 { 336 #if IS_ENABLED(CONFIG_I2C) 337 i2c_del_driver(&wm8728_i2c_driver); 338 #endif 339 #if defined(CONFIG_SPI_MASTER) 340 spi_unregister_driver(&wm8728_spi_driver); 341 #endif 342 } 343 module_exit(wm8728_exit); 344 345 MODULE_DESCRIPTION("ASoC WM8728 driver"); 346 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 347 MODULE_LICENSE("GPL"); 348