1 /* 2 * wm8978.c -- WM8978 ALSA SoC Audio Codec driver 3 * 4 * Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de> 5 * Copyright (C) 2007 Carlos Munoz <carlos@kenati.com> 6 * Copyright 2006-2009 Wolfson Microelectronics PLC. 7 * Based on wm8974 and wm8990 by Liam Girdwood <lrg@slimlogic.co.uk> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 14 #include <linux/module.h> 15 #include <linux/moduleparam.h> 16 #include <linux/kernel.h> 17 #include <linux/init.h> 18 #include <linux/delay.h> 19 #include <linux/pm.h> 20 #include <linux/i2c.h> 21 #include <linux/regmap.h> 22 #include <linux/slab.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 #include <asm/div64.h> 30 31 #include "wm8978.h" 32 33 static const struct reg_default wm8978_reg_defaults[] = { 34 { 1, 0x0000 }, 35 { 2, 0x0000 }, 36 { 3, 0x0000 }, 37 { 4, 0x0050 }, 38 { 5, 0x0000 }, 39 { 6, 0x0140 }, 40 { 7, 0x0000 }, 41 { 8, 0x0000 }, 42 { 9, 0x0000 }, 43 { 10, 0x0000 }, 44 { 11, 0x00ff }, 45 { 12, 0x00ff }, 46 { 13, 0x0000 }, 47 { 14, 0x0100 }, 48 { 15, 0x00ff }, 49 { 16, 0x00ff }, 50 { 17, 0x0000 }, 51 { 18, 0x012c }, 52 { 19, 0x002c }, 53 { 20, 0x002c }, 54 { 21, 0x002c }, 55 { 22, 0x002c }, 56 { 23, 0x0000 }, 57 { 24, 0x0032 }, 58 { 25, 0x0000 }, 59 { 26, 0x0000 }, 60 { 27, 0x0000 }, 61 { 28, 0x0000 }, 62 { 29, 0x0000 }, 63 { 30, 0x0000 }, 64 { 31, 0x0000 }, 65 { 32, 0x0038 }, 66 { 33, 0x000b }, 67 { 34, 0x0032 }, 68 { 35, 0x0000 }, 69 { 36, 0x0008 }, 70 { 37, 0x000c }, 71 { 38, 0x0093 }, 72 { 39, 0x00e9 }, 73 { 40, 0x0000 }, 74 { 41, 0x0000 }, 75 { 42, 0x0000 }, 76 { 43, 0x0000 }, 77 { 44, 0x0033 }, 78 { 45, 0x0010 }, 79 { 46, 0x0010 }, 80 { 47, 0x0100 }, 81 { 48, 0x0100 }, 82 { 49, 0x0002 }, 83 { 50, 0x0001 }, 84 { 51, 0x0001 }, 85 { 52, 0x0039 }, 86 { 53, 0x0039 }, 87 { 54, 0x0039 }, 88 { 55, 0x0039 }, 89 { 56, 0x0001 }, 90 { 57, 0x0001 }, 91 }; 92 93 static bool wm8978_volatile(struct device *dev, unsigned int reg) 94 { 95 return reg == WM8978_RESET; 96 } 97 98 /* codec private data */ 99 struct wm8978_priv { 100 struct regmap *regmap; 101 unsigned int f_pllout; 102 unsigned int f_mclk; 103 unsigned int f_256fs; 104 unsigned int f_opclk; 105 int mclk_idx; 106 enum wm8978_sysclk_src sysclk; 107 }; 108 109 static const char *wm8978_companding[] = {"Off", "NC", "u-law", "A-law"}; 110 static const char *wm8978_eqmode[] = {"Capture", "Playback"}; 111 static const char *wm8978_bw[] = {"Narrow", "Wide"}; 112 static const char *wm8978_eq1[] = {"80Hz", "105Hz", "135Hz", "175Hz"}; 113 static const char *wm8978_eq2[] = {"230Hz", "300Hz", "385Hz", "500Hz"}; 114 static const char *wm8978_eq3[] = {"650Hz", "850Hz", "1.1kHz", "1.4kHz"}; 115 static const char *wm8978_eq4[] = {"1.8kHz", "2.4kHz", "3.2kHz", "4.1kHz"}; 116 static const char *wm8978_eq5[] = {"5.3kHz", "6.9kHz", "9kHz", "11.7kHz"}; 117 static const char *wm8978_alc3[] = {"ALC", "Limiter"}; 118 static const char *wm8978_alc1[] = {"Off", "Right", "Left", "Both"}; 119 120 static SOC_ENUM_SINGLE_DECL(adc_compand, WM8978_COMPANDING_CONTROL, 1, 121 wm8978_companding); 122 static SOC_ENUM_SINGLE_DECL(dac_compand, WM8978_COMPANDING_CONTROL, 3, 123 wm8978_companding); 124 static SOC_ENUM_SINGLE_DECL(eqmode, WM8978_EQ1, 8, wm8978_eqmode); 125 static SOC_ENUM_SINGLE_DECL(eq1, WM8978_EQ1, 5, wm8978_eq1); 126 static SOC_ENUM_SINGLE_DECL(eq2bw, WM8978_EQ2, 8, wm8978_bw); 127 static SOC_ENUM_SINGLE_DECL(eq2, WM8978_EQ2, 5, wm8978_eq2); 128 static SOC_ENUM_SINGLE_DECL(eq3bw, WM8978_EQ3, 8, wm8978_bw); 129 static SOC_ENUM_SINGLE_DECL(eq3, WM8978_EQ3, 5, wm8978_eq3); 130 static SOC_ENUM_SINGLE_DECL(eq4bw, WM8978_EQ4, 8, wm8978_bw); 131 static SOC_ENUM_SINGLE_DECL(eq4, WM8978_EQ4, 5, wm8978_eq4); 132 static SOC_ENUM_SINGLE_DECL(eq5, WM8978_EQ5, 5, wm8978_eq5); 133 static SOC_ENUM_SINGLE_DECL(alc3, WM8978_ALC_CONTROL_3, 8, wm8978_alc3); 134 static SOC_ENUM_SINGLE_DECL(alc1, WM8978_ALC_CONTROL_1, 7, wm8978_alc1); 135 136 static const DECLARE_TLV_DB_SCALE(digital_tlv, -12750, 50, 1); 137 static const DECLARE_TLV_DB_SCALE(eq_tlv, -1200, 100, 0); 138 static const DECLARE_TLV_DB_SCALE(inpga_tlv, -1200, 75, 0); 139 static const DECLARE_TLV_DB_SCALE(spk_tlv, -5700, 100, 0); 140 static const DECLARE_TLV_DB_SCALE(boost_tlv, -1500, 300, 1); 141 static const DECLARE_TLV_DB_SCALE(limiter_tlv, 0, 100, 0); 142 143 static const struct snd_kcontrol_new wm8978_snd_controls[] = { 144 145 SOC_SINGLE("Digital Loopback Switch", 146 WM8978_COMPANDING_CONTROL, 0, 1, 0), 147 148 SOC_ENUM("ADC Companding", adc_compand), 149 SOC_ENUM("DAC Companding", dac_compand), 150 151 SOC_DOUBLE("DAC Inversion Switch", WM8978_DAC_CONTROL, 0, 1, 1, 0), 152 153 SOC_DOUBLE_R_TLV("PCM Volume", 154 WM8978_LEFT_DAC_DIGITAL_VOLUME, WM8978_RIGHT_DAC_DIGITAL_VOLUME, 155 0, 255, 0, digital_tlv), 156 157 SOC_SINGLE("High Pass Filter Switch", WM8978_ADC_CONTROL, 8, 1, 0), 158 SOC_SINGLE("High Pass Cut Off", WM8978_ADC_CONTROL, 4, 7, 0), 159 SOC_DOUBLE("ADC Inversion Switch", WM8978_ADC_CONTROL, 0, 1, 1, 0), 160 161 SOC_DOUBLE_R_TLV("ADC Volume", 162 WM8978_LEFT_ADC_DIGITAL_VOLUME, WM8978_RIGHT_ADC_DIGITAL_VOLUME, 163 0, 255, 0, digital_tlv), 164 165 SOC_ENUM("Equaliser Function", eqmode), 166 SOC_ENUM("EQ1 Cut Off", eq1), 167 SOC_SINGLE_TLV("EQ1 Volume", WM8978_EQ1, 0, 24, 1, eq_tlv), 168 169 SOC_ENUM("Equaliser EQ2 Bandwidth", eq2bw), 170 SOC_ENUM("EQ2 Cut Off", eq2), 171 SOC_SINGLE_TLV("EQ2 Volume", WM8978_EQ2, 0, 24, 1, eq_tlv), 172 173 SOC_ENUM("Equaliser EQ3 Bandwidth", eq3bw), 174 SOC_ENUM("EQ3 Cut Off", eq3), 175 SOC_SINGLE_TLV("EQ3 Volume", WM8978_EQ3, 0, 24, 1, eq_tlv), 176 177 SOC_ENUM("Equaliser EQ4 Bandwidth", eq4bw), 178 SOC_ENUM("EQ4 Cut Off", eq4), 179 SOC_SINGLE_TLV("EQ4 Volume", WM8978_EQ4, 0, 24, 1, eq_tlv), 180 181 SOC_ENUM("EQ5 Cut Off", eq5), 182 SOC_SINGLE_TLV("EQ5 Volume", WM8978_EQ5, 0, 24, 1, eq_tlv), 183 184 SOC_SINGLE("DAC Playback Limiter Switch", 185 WM8978_DAC_LIMITER_1, 8, 1, 0), 186 SOC_SINGLE("DAC Playback Limiter Decay", 187 WM8978_DAC_LIMITER_1, 4, 15, 0), 188 SOC_SINGLE("DAC Playback Limiter Attack", 189 WM8978_DAC_LIMITER_1, 0, 15, 0), 190 191 SOC_SINGLE("DAC Playback Limiter Threshold", 192 WM8978_DAC_LIMITER_2, 4, 7, 0), 193 SOC_SINGLE_TLV("DAC Playback Limiter Volume", 194 WM8978_DAC_LIMITER_2, 0, 12, 0, limiter_tlv), 195 196 SOC_ENUM("ALC Enable Switch", alc1), 197 SOC_SINGLE("ALC Capture Min Gain", WM8978_ALC_CONTROL_1, 0, 7, 0), 198 SOC_SINGLE("ALC Capture Max Gain", WM8978_ALC_CONTROL_1, 3, 7, 0), 199 200 SOC_SINGLE("ALC Capture Hold", WM8978_ALC_CONTROL_2, 4, 10, 0), 201 SOC_SINGLE("ALC Capture Target", WM8978_ALC_CONTROL_2, 0, 15, 0), 202 203 SOC_ENUM("ALC Capture Mode", alc3), 204 SOC_SINGLE("ALC Capture Decay", WM8978_ALC_CONTROL_3, 4, 10, 0), 205 SOC_SINGLE("ALC Capture Attack", WM8978_ALC_CONTROL_3, 0, 10, 0), 206 207 SOC_SINGLE("ALC Capture Noise Gate Switch", WM8978_NOISE_GATE, 3, 1, 0), 208 SOC_SINGLE("ALC Capture Noise Gate Threshold", 209 WM8978_NOISE_GATE, 0, 7, 0), 210 211 SOC_DOUBLE_R("Capture PGA ZC Switch", 212 WM8978_LEFT_INP_PGA_CONTROL, WM8978_RIGHT_INP_PGA_CONTROL, 213 7, 1, 0), 214 215 /* OUT1 - Headphones */ 216 SOC_DOUBLE_R("Headphone Playback ZC Switch", 217 WM8978_LOUT1_HP_CONTROL, WM8978_ROUT1_HP_CONTROL, 7, 1, 0), 218 219 SOC_DOUBLE_R_TLV("Headphone Playback Volume", 220 WM8978_LOUT1_HP_CONTROL, WM8978_ROUT1_HP_CONTROL, 221 0, 63, 0, spk_tlv), 222 223 /* OUT2 - Speakers */ 224 SOC_DOUBLE_R("Speaker Playback ZC Switch", 225 WM8978_LOUT2_SPK_CONTROL, WM8978_ROUT2_SPK_CONTROL, 7, 1, 0), 226 227 SOC_DOUBLE_R_TLV("Speaker Playback Volume", 228 WM8978_LOUT2_SPK_CONTROL, WM8978_ROUT2_SPK_CONTROL, 229 0, 63, 0, spk_tlv), 230 231 /* OUT3/4 - Line Output */ 232 SOC_DOUBLE_R("Line Playback Switch", 233 WM8978_OUT3_MIXER_CONTROL, WM8978_OUT4_MIXER_CONTROL, 6, 1, 1), 234 235 /* Mixer #3: Boost (Input) mixer */ 236 SOC_DOUBLE_R("PGA Boost (+20dB)", 237 WM8978_LEFT_ADC_BOOST_CONTROL, WM8978_RIGHT_ADC_BOOST_CONTROL, 238 8, 1, 0), 239 SOC_DOUBLE_R_TLV("L2/R2 Boost Volume", 240 WM8978_LEFT_ADC_BOOST_CONTROL, WM8978_RIGHT_ADC_BOOST_CONTROL, 241 4, 7, 0, boost_tlv), 242 SOC_DOUBLE_R_TLV("Aux Boost Volume", 243 WM8978_LEFT_ADC_BOOST_CONTROL, WM8978_RIGHT_ADC_BOOST_CONTROL, 244 0, 7, 0, boost_tlv), 245 246 /* Input PGA volume */ 247 SOC_DOUBLE_R_TLV("Input PGA Volume", 248 WM8978_LEFT_INP_PGA_CONTROL, WM8978_RIGHT_INP_PGA_CONTROL, 249 0, 63, 0, inpga_tlv), 250 251 /* Headphone */ 252 SOC_DOUBLE_R("Headphone Switch", 253 WM8978_LOUT1_HP_CONTROL, WM8978_ROUT1_HP_CONTROL, 6, 1, 1), 254 255 /* Speaker */ 256 SOC_DOUBLE_R("Speaker Switch", 257 WM8978_LOUT2_SPK_CONTROL, WM8978_ROUT2_SPK_CONTROL, 6, 1, 1), 258 259 /* DAC / ADC oversampling */ 260 SOC_SINGLE("DAC 128x Oversampling Switch", WM8978_DAC_CONTROL, 261 5, 1, 0), 262 SOC_SINGLE("ADC 128x Oversampling Switch", WM8978_ADC_CONTROL, 263 5, 1, 0), 264 }; 265 266 /* Mixer #1: Output (OUT1, OUT2) Mixer: mix AUX, Input mixer output and DAC */ 267 static const struct snd_kcontrol_new wm8978_left_out_mixer[] = { 268 SOC_DAPM_SINGLE("Line Bypass Switch", WM8978_LEFT_MIXER_CONTROL, 1, 1, 0), 269 SOC_DAPM_SINGLE("Aux Playback Switch", WM8978_LEFT_MIXER_CONTROL, 5, 1, 0), 270 SOC_DAPM_SINGLE("PCM Playback Switch", WM8978_LEFT_MIXER_CONTROL, 0, 1, 0), 271 }; 272 273 static const struct snd_kcontrol_new wm8978_right_out_mixer[] = { 274 SOC_DAPM_SINGLE("Line Bypass Switch", WM8978_RIGHT_MIXER_CONTROL, 1, 1, 0), 275 SOC_DAPM_SINGLE("Aux Playback Switch", WM8978_RIGHT_MIXER_CONTROL, 5, 1, 0), 276 SOC_DAPM_SINGLE("PCM Playback Switch", WM8978_RIGHT_MIXER_CONTROL, 0, 1, 0), 277 }; 278 279 /* OUT3/OUT4 Mixer not implemented */ 280 281 /* Mixer #2: Input PGA Mute */ 282 static const struct snd_kcontrol_new wm8978_left_input_mixer[] = { 283 SOC_DAPM_SINGLE("L2 Switch", WM8978_INPUT_CONTROL, 2, 1, 0), 284 SOC_DAPM_SINGLE("MicN Switch", WM8978_INPUT_CONTROL, 1, 1, 0), 285 SOC_DAPM_SINGLE("MicP Switch", WM8978_INPUT_CONTROL, 0, 1, 0), 286 }; 287 static const struct snd_kcontrol_new wm8978_right_input_mixer[] = { 288 SOC_DAPM_SINGLE("R2 Switch", WM8978_INPUT_CONTROL, 6, 1, 0), 289 SOC_DAPM_SINGLE("MicN Switch", WM8978_INPUT_CONTROL, 5, 1, 0), 290 SOC_DAPM_SINGLE("MicP Switch", WM8978_INPUT_CONTROL, 4, 1, 0), 291 }; 292 293 static const struct snd_soc_dapm_widget wm8978_dapm_widgets[] = { 294 SND_SOC_DAPM_DAC("Left DAC", "Left HiFi Playback", 295 WM8978_POWER_MANAGEMENT_3, 0, 0), 296 SND_SOC_DAPM_DAC("Right DAC", "Right HiFi Playback", 297 WM8978_POWER_MANAGEMENT_3, 1, 0), 298 SND_SOC_DAPM_ADC("Left ADC", "Left HiFi Capture", 299 WM8978_POWER_MANAGEMENT_2, 0, 0), 300 SND_SOC_DAPM_ADC("Right ADC", "Right HiFi Capture", 301 WM8978_POWER_MANAGEMENT_2, 1, 0), 302 303 /* Mixer #1: OUT1,2 */ 304 SOC_MIXER_ARRAY("Left Output Mixer", WM8978_POWER_MANAGEMENT_3, 305 2, 0, wm8978_left_out_mixer), 306 SOC_MIXER_ARRAY("Right Output Mixer", WM8978_POWER_MANAGEMENT_3, 307 3, 0, wm8978_right_out_mixer), 308 309 SOC_MIXER_ARRAY("Left Input Mixer", WM8978_POWER_MANAGEMENT_2, 310 2, 0, wm8978_left_input_mixer), 311 SOC_MIXER_ARRAY("Right Input Mixer", WM8978_POWER_MANAGEMENT_2, 312 3, 0, wm8978_right_input_mixer), 313 314 SND_SOC_DAPM_PGA("Left Boost Mixer", WM8978_POWER_MANAGEMENT_2, 315 4, 0, NULL, 0), 316 SND_SOC_DAPM_PGA("Right Boost Mixer", WM8978_POWER_MANAGEMENT_2, 317 5, 0, NULL, 0), 318 319 SND_SOC_DAPM_PGA("Left Capture PGA", WM8978_LEFT_INP_PGA_CONTROL, 320 6, 1, NULL, 0), 321 SND_SOC_DAPM_PGA("Right Capture PGA", WM8978_RIGHT_INP_PGA_CONTROL, 322 6, 1, NULL, 0), 323 324 SND_SOC_DAPM_PGA("Left Headphone Out", WM8978_POWER_MANAGEMENT_2, 325 7, 0, NULL, 0), 326 SND_SOC_DAPM_PGA("Right Headphone Out", WM8978_POWER_MANAGEMENT_2, 327 8, 0, NULL, 0), 328 329 SND_SOC_DAPM_PGA("Left Speaker Out", WM8978_POWER_MANAGEMENT_3, 330 6, 0, NULL, 0), 331 SND_SOC_DAPM_PGA("Right Speaker Out", WM8978_POWER_MANAGEMENT_3, 332 5, 0, NULL, 0), 333 334 SND_SOC_DAPM_MIXER("OUT4 VMID", WM8978_POWER_MANAGEMENT_3, 335 8, 0, NULL, 0), 336 337 SND_SOC_DAPM_MICBIAS("Mic Bias", WM8978_POWER_MANAGEMENT_1, 4, 0), 338 339 SND_SOC_DAPM_INPUT("LMICN"), 340 SND_SOC_DAPM_INPUT("LMICP"), 341 SND_SOC_DAPM_INPUT("RMICN"), 342 SND_SOC_DAPM_INPUT("RMICP"), 343 SND_SOC_DAPM_INPUT("LAUX"), 344 SND_SOC_DAPM_INPUT("RAUX"), 345 SND_SOC_DAPM_INPUT("L2"), 346 SND_SOC_DAPM_INPUT("R2"), 347 SND_SOC_DAPM_OUTPUT("LHP"), 348 SND_SOC_DAPM_OUTPUT("RHP"), 349 SND_SOC_DAPM_OUTPUT("LSPK"), 350 SND_SOC_DAPM_OUTPUT("RSPK"), 351 }; 352 353 static const struct snd_soc_dapm_route wm8978_dapm_routes[] = { 354 /* Output mixer */ 355 {"Right Output Mixer", "PCM Playback Switch", "Right DAC"}, 356 {"Right Output Mixer", "Aux Playback Switch", "RAUX"}, 357 {"Right Output Mixer", "Line Bypass Switch", "Right Boost Mixer"}, 358 359 {"Left Output Mixer", "PCM Playback Switch", "Left DAC"}, 360 {"Left Output Mixer", "Aux Playback Switch", "LAUX"}, 361 {"Left Output Mixer", "Line Bypass Switch", "Left Boost Mixer"}, 362 363 /* Outputs */ 364 {"Right Headphone Out", NULL, "Right Output Mixer"}, 365 {"RHP", NULL, "Right Headphone Out"}, 366 367 {"Left Headphone Out", NULL, "Left Output Mixer"}, 368 {"LHP", NULL, "Left Headphone Out"}, 369 370 {"Right Speaker Out", NULL, "Right Output Mixer"}, 371 {"RSPK", NULL, "Right Speaker Out"}, 372 373 {"Left Speaker Out", NULL, "Left Output Mixer"}, 374 {"LSPK", NULL, "Left Speaker Out"}, 375 376 /* Boost Mixer */ 377 {"Right ADC", NULL, "Right Boost Mixer"}, 378 379 {"Right Boost Mixer", NULL, "RAUX"}, 380 {"Right Boost Mixer", NULL, "Right Capture PGA"}, 381 {"Right Boost Mixer", NULL, "R2"}, 382 383 {"Left ADC", NULL, "Left Boost Mixer"}, 384 385 {"Left Boost Mixer", NULL, "LAUX"}, 386 {"Left Boost Mixer", NULL, "Left Capture PGA"}, 387 {"Left Boost Mixer", NULL, "L2"}, 388 389 /* Input PGA */ 390 {"Right Capture PGA", NULL, "Right Input Mixer"}, 391 {"Left Capture PGA", NULL, "Left Input Mixer"}, 392 393 {"Right Input Mixer", "R2 Switch", "R2"}, 394 {"Right Input Mixer", "MicN Switch", "RMICN"}, 395 {"Right Input Mixer", "MicP Switch", "RMICP"}, 396 397 {"Left Input Mixer", "L2 Switch", "L2"}, 398 {"Left Input Mixer", "MicN Switch", "LMICN"}, 399 {"Left Input Mixer", "MicP Switch", "LMICP"}, 400 }; 401 402 /* PLL divisors */ 403 struct wm8978_pll_div { 404 u32 k; 405 u8 n; 406 u8 div2; 407 }; 408 409 #define FIXED_PLL_SIZE (1 << 24) 410 411 static void pll_factors(struct snd_soc_codec *codec, 412 struct wm8978_pll_div *pll_div, unsigned int target, unsigned int source) 413 { 414 u64 k_part; 415 unsigned int k, n_div, n_mod; 416 417 n_div = target / source; 418 if (n_div < 6) { 419 source >>= 1; 420 pll_div->div2 = 1; 421 n_div = target / source; 422 } else { 423 pll_div->div2 = 0; 424 } 425 426 if (n_div < 6 || n_div > 12) 427 dev_warn(codec->dev, 428 "WM8978 N value exceeds recommended range! N = %u\n", 429 n_div); 430 431 pll_div->n = n_div; 432 n_mod = target - source * n_div; 433 k_part = FIXED_PLL_SIZE * (long long)n_mod + source / 2; 434 435 do_div(k_part, source); 436 437 k = k_part & 0xFFFFFFFF; 438 439 pll_div->k = k; 440 } 441 442 /* MCLK dividers */ 443 static const int mclk_numerator[] = {1, 3, 2, 3, 4, 6, 8, 12}; 444 static const int mclk_denominator[] = {1, 2, 1, 1, 1, 1, 1, 1}; 445 446 /* 447 * find index >= idx, such that, for a given f_out, 448 * 3 * f_mclk / 4 <= f_PLLOUT < 13 * f_mclk / 4 449 * f_out can be f_256fs or f_opclk, currently only used for f_256fs. Can be 450 * generalised for f_opclk with suitable coefficient arrays, but currently 451 * the OPCLK divisor is calculated directly, not iteratively. 452 */ 453 static int wm8978_enum_mclk(unsigned int f_out, unsigned int f_mclk, 454 unsigned int *f_pllout) 455 { 456 int i; 457 458 for (i = 0; i < ARRAY_SIZE(mclk_numerator); i++) { 459 unsigned int f_pllout_x4 = 4 * f_out * mclk_numerator[i] / 460 mclk_denominator[i]; 461 if (3 * f_mclk <= f_pllout_x4 && f_pllout_x4 < 13 * f_mclk) { 462 *f_pllout = f_pllout_x4 / 4; 463 return i; 464 } 465 } 466 467 return -EINVAL; 468 } 469 470 /* 471 * Calculate internal frequencies and dividers, according to Figure 40 472 * "PLL and Clock Select Circuit" in WM8978 datasheet Rev. 2.6 473 */ 474 static int wm8978_configure_pll(struct snd_soc_codec *codec) 475 { 476 struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec); 477 struct wm8978_pll_div pll_div; 478 unsigned int f_opclk = wm8978->f_opclk, f_mclk = wm8978->f_mclk, 479 f_256fs = wm8978->f_256fs; 480 unsigned int f2; 481 482 if (!f_mclk) 483 return -EINVAL; 484 485 if (f_opclk) { 486 unsigned int opclk_div; 487 /* Cannot set up MCLK divider now, do later */ 488 wm8978->mclk_idx = -1; 489 490 /* 491 * The user needs OPCLK. Choose OPCLKDIV to put 492 * 6 <= R = f2 / f1 < 13, 1 <= OPCLKDIV <= 4. 493 * f_opclk = f_mclk * prescale * R / 4 / OPCLKDIV, where 494 * prescale = 1, or prescale = 2. Prescale is calculated inside 495 * pll_factors(). We have to select f_PLLOUT, such that 496 * f_mclk * 3 / 4 <= f_PLLOUT < f_mclk * 13 / 4. Must be 497 * f_mclk * 3 / 16 <= f_opclk < f_mclk * 13 / 4. 498 */ 499 if (16 * f_opclk < 3 * f_mclk || 4 * f_opclk >= 13 * f_mclk) 500 return -EINVAL; 501 502 if (4 * f_opclk < 3 * f_mclk) 503 /* Have to use OPCLKDIV */ 504 opclk_div = (3 * f_mclk / 4 + f_opclk - 1) / f_opclk; 505 else 506 opclk_div = 1; 507 508 dev_dbg(codec->dev, "%s: OPCLKDIV=%d\n", __func__, opclk_div); 509 510 snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 0x30, 511 (opclk_div - 1) << 4); 512 513 wm8978->f_pllout = f_opclk * opclk_div; 514 } else if (f_256fs) { 515 /* 516 * Not using OPCLK, but PLL is used for the codec, choose R: 517 * 6 <= R = f2 / f1 < 13, to put 1 <= MCLKDIV <= 12. 518 * f_256fs = f_mclk * prescale * R / 4 / MCLKDIV, where 519 * prescale = 1, or prescale = 2. Prescale is calculated inside 520 * pll_factors(). We have to select f_PLLOUT, such that 521 * f_mclk * 3 / 4 <= f_PLLOUT < f_mclk * 13 / 4. Must be 522 * f_mclk * 3 / 48 <= f_256fs < f_mclk * 13 / 4. This means MCLK 523 * must be 3.781MHz <= f_MCLK <= 32.768MHz 524 */ 525 int idx = wm8978_enum_mclk(f_256fs, f_mclk, &wm8978->f_pllout); 526 if (idx < 0) 527 return idx; 528 529 wm8978->mclk_idx = idx; 530 } else { 531 return -EINVAL; 532 } 533 534 f2 = wm8978->f_pllout * 4; 535 536 dev_dbg(codec->dev, "%s: f_MCLK=%uHz, f_PLLOUT=%uHz\n", __func__, 537 wm8978->f_mclk, wm8978->f_pllout); 538 539 pll_factors(codec, &pll_div, f2, wm8978->f_mclk); 540 541 dev_dbg(codec->dev, "%s: calculated PLL N=0x%x, K=0x%x, div2=%d\n", 542 __func__, pll_div.n, pll_div.k, pll_div.div2); 543 544 /* Turn PLL off for configuration... */ 545 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0); 546 547 snd_soc_write(codec, WM8978_PLL_N, (pll_div.div2 << 4) | pll_div.n); 548 snd_soc_write(codec, WM8978_PLL_K1, pll_div.k >> 18); 549 snd_soc_write(codec, WM8978_PLL_K2, (pll_div.k >> 9) & 0x1ff); 550 snd_soc_write(codec, WM8978_PLL_K3, pll_div.k & 0x1ff); 551 552 /* ...and on again */ 553 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0x20); 554 555 if (f_opclk) 556 /* Output PLL (OPCLK) to GPIO1 */ 557 snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 7, 4); 558 559 return 0; 560 } 561 562 /* 563 * Configure WM8978 clock dividers. 564 */ 565 static int wm8978_set_dai_clkdiv(struct snd_soc_dai *codec_dai, 566 int div_id, int div) 567 { 568 struct snd_soc_codec *codec = codec_dai->codec; 569 struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec); 570 int ret = 0; 571 572 switch (div_id) { 573 case WM8978_OPCLKRATE: 574 wm8978->f_opclk = div; 575 576 if (wm8978->f_mclk) 577 /* 578 * We know the MCLK frequency, the user has requested 579 * OPCLK, configure the PLL based on that and start it 580 * and OPCLK immediately. We will configure PLL to match 581 * user-requested OPCLK frquency as good as possible. 582 * In fact, it is likely, that matching the sampling 583 * rate, when it becomes known, is more important, and 584 * we will not be reconfiguring PLL then, because we 585 * must not interrupt OPCLK. But it should be fine, 586 * because typically the user will request OPCLK to run 587 * at 256fs or 512fs, and for these cases we will also 588 * find an exact MCLK divider configuration - it will 589 * be equal to or double the OPCLK divisor. 590 */ 591 ret = wm8978_configure_pll(codec); 592 break; 593 case WM8978_BCLKDIV: 594 if (div & ~0x1c) 595 return -EINVAL; 596 snd_soc_update_bits(codec, WM8978_CLOCKING, 0x1c, div); 597 break; 598 default: 599 return -EINVAL; 600 } 601 602 dev_dbg(codec->dev, "%s: ID %d, value %u\n", __func__, div_id, div); 603 604 return ret; 605 } 606 607 /* 608 * @freq: when .set_pll() us not used, freq is codec MCLK input frequency 609 */ 610 static int wm8978_set_dai_sysclk(struct snd_soc_dai *codec_dai, int clk_id, 611 unsigned int freq, int dir) 612 { 613 struct snd_soc_codec *codec = codec_dai->codec; 614 struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec); 615 int ret = 0; 616 617 dev_dbg(codec->dev, "%s: ID %d, freq %u\n", __func__, clk_id, freq); 618 619 if (freq) { 620 wm8978->f_mclk = freq; 621 622 /* Even if MCLK is used for system clock, might have to drive OPCLK */ 623 if (wm8978->f_opclk) 624 ret = wm8978_configure_pll(codec); 625 626 /* Our sysclk is fixed to 256 * fs, will configure in .hw_params() */ 627 628 if (!ret) 629 wm8978->sysclk = clk_id; 630 } 631 632 if (wm8978->sysclk == WM8978_PLL && (!freq || clk_id == WM8978_MCLK)) { 633 /* Clock CODEC directly from MCLK */ 634 snd_soc_update_bits(codec, WM8978_CLOCKING, 0x100, 0); 635 636 /* GPIO1 into default mode as input - before configuring PLL */ 637 snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 7, 0); 638 639 /* Turn off PLL */ 640 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0); 641 wm8978->sysclk = WM8978_MCLK; 642 wm8978->f_pllout = 0; 643 wm8978->f_opclk = 0; 644 } 645 646 return ret; 647 } 648 649 /* 650 * Set ADC and Voice DAC format. 651 */ 652 static int wm8978_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt) 653 { 654 struct snd_soc_codec *codec = codec_dai->codec; 655 /* 656 * BCLK polarity mask = 0x100, LRC clock polarity mask = 0x80, 657 * Data Format mask = 0x18: all will be calculated anew 658 */ 659 u16 iface = snd_soc_read(codec, WM8978_AUDIO_INTERFACE) & ~0x198; 660 u16 clk = snd_soc_read(codec, WM8978_CLOCKING); 661 662 dev_dbg(codec->dev, "%s\n", __func__); 663 664 /* set master/slave audio interface */ 665 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { 666 case SND_SOC_DAIFMT_CBM_CFM: 667 clk |= 1; 668 break; 669 case SND_SOC_DAIFMT_CBS_CFS: 670 clk &= ~1; 671 break; 672 default: 673 return -EINVAL; 674 } 675 676 /* interface format */ 677 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 678 case SND_SOC_DAIFMT_I2S: 679 iface |= 0x10; 680 break; 681 case SND_SOC_DAIFMT_RIGHT_J: 682 break; 683 case SND_SOC_DAIFMT_LEFT_J: 684 iface |= 0x8; 685 break; 686 case SND_SOC_DAIFMT_DSP_A: 687 iface |= 0x18; 688 break; 689 default: 690 return -EINVAL; 691 } 692 693 /* clock inversion */ 694 switch (fmt & SND_SOC_DAIFMT_INV_MASK) { 695 case SND_SOC_DAIFMT_NB_NF: 696 break; 697 case SND_SOC_DAIFMT_IB_IF: 698 iface |= 0x180; 699 break; 700 case SND_SOC_DAIFMT_IB_NF: 701 iface |= 0x100; 702 break; 703 case SND_SOC_DAIFMT_NB_IF: 704 iface |= 0x80; 705 break; 706 default: 707 return -EINVAL; 708 } 709 710 snd_soc_write(codec, WM8978_AUDIO_INTERFACE, iface); 711 snd_soc_write(codec, WM8978_CLOCKING, clk); 712 713 return 0; 714 } 715 716 /* 717 * Set PCM DAI bit size and sample rate. 718 */ 719 static int wm8978_hw_params(struct snd_pcm_substream *substream, 720 struct snd_pcm_hw_params *params, 721 struct snd_soc_dai *dai) 722 { 723 struct snd_soc_codec *codec = dai->codec; 724 struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec); 725 /* Word length mask = 0x60 */ 726 u16 iface_ctl = snd_soc_read(codec, WM8978_AUDIO_INTERFACE) & ~0x60; 727 /* Sampling rate mask = 0xe (for filters) */ 728 u16 add_ctl = snd_soc_read(codec, WM8978_ADDITIONAL_CONTROL) & ~0xe; 729 u16 clking = snd_soc_read(codec, WM8978_CLOCKING); 730 enum wm8978_sysclk_src current_clk_id = clking & 0x100 ? 731 WM8978_PLL : WM8978_MCLK; 732 unsigned int f_sel, diff, diff_best = INT_MAX; 733 int i, best = 0; 734 735 if (!wm8978->f_mclk) 736 return -EINVAL; 737 738 /* bit size */ 739 switch (params_width(params)) { 740 case 16: 741 break; 742 case 20: 743 iface_ctl |= 0x20; 744 break; 745 case 24: 746 iface_ctl |= 0x40; 747 break; 748 case 32: 749 iface_ctl |= 0x60; 750 break; 751 } 752 753 /* filter coefficient */ 754 switch (params_rate(params)) { 755 case 8000: 756 add_ctl |= 0x5 << 1; 757 break; 758 case 11025: 759 add_ctl |= 0x4 << 1; 760 break; 761 case 16000: 762 add_ctl |= 0x3 << 1; 763 break; 764 case 22050: 765 add_ctl |= 0x2 << 1; 766 break; 767 case 32000: 768 add_ctl |= 0x1 << 1; 769 break; 770 case 44100: 771 case 48000: 772 break; 773 } 774 775 /* Sampling rate is known now, can configure the MCLK divider */ 776 wm8978->f_256fs = params_rate(params) * 256; 777 778 if (wm8978->sysclk == WM8978_MCLK) { 779 wm8978->mclk_idx = -1; 780 f_sel = wm8978->f_mclk; 781 } else { 782 if (!wm8978->f_opclk) { 783 /* We only enter here, if OPCLK is not used */ 784 int ret = wm8978_configure_pll(codec); 785 if (ret < 0) 786 return ret; 787 } 788 f_sel = wm8978->f_pllout; 789 } 790 791 if (wm8978->mclk_idx < 0) { 792 /* Either MCLK is used directly, or OPCLK is used */ 793 if (f_sel < wm8978->f_256fs || f_sel > 12 * wm8978->f_256fs) 794 return -EINVAL; 795 796 for (i = 0; i < ARRAY_SIZE(mclk_numerator); i++) { 797 diff = abs(wm8978->f_256fs * 3 - 798 f_sel * 3 * mclk_denominator[i] / mclk_numerator[i]); 799 800 if (diff < diff_best) { 801 diff_best = diff; 802 best = i; 803 } 804 805 if (!diff) 806 break; 807 } 808 } else { 809 /* OPCLK not used, codec driven by PLL */ 810 best = wm8978->mclk_idx; 811 diff = 0; 812 } 813 814 if (diff) 815 dev_warn(codec->dev, "Imprecise sampling rate: %uHz%s\n", 816 f_sel * mclk_denominator[best] / mclk_numerator[best] / 256, 817 wm8978->sysclk == WM8978_MCLK ? 818 ", consider using PLL" : ""); 819 820 dev_dbg(codec->dev, "%s: width %d, rate %u, MCLK divisor #%d\n", __func__, 821 params_width(params), params_rate(params), best); 822 823 /* MCLK divisor mask = 0xe0 */ 824 snd_soc_update_bits(codec, WM8978_CLOCKING, 0xe0, best << 5); 825 826 snd_soc_write(codec, WM8978_AUDIO_INTERFACE, iface_ctl); 827 snd_soc_write(codec, WM8978_ADDITIONAL_CONTROL, add_ctl); 828 829 if (wm8978->sysclk != current_clk_id) { 830 if (wm8978->sysclk == WM8978_PLL) 831 /* Run CODEC from PLL instead of MCLK */ 832 snd_soc_update_bits(codec, WM8978_CLOCKING, 833 0x100, 0x100); 834 else 835 /* Clock CODEC directly from MCLK */ 836 snd_soc_update_bits(codec, WM8978_CLOCKING, 0x100, 0); 837 } 838 839 return 0; 840 } 841 842 static int wm8978_mute(struct snd_soc_dai *dai, int mute) 843 { 844 struct snd_soc_codec *codec = dai->codec; 845 846 dev_dbg(codec->dev, "%s: %d\n", __func__, mute); 847 848 if (mute) 849 snd_soc_update_bits(codec, WM8978_DAC_CONTROL, 0x40, 0x40); 850 else 851 snd_soc_update_bits(codec, WM8978_DAC_CONTROL, 0x40, 0); 852 853 return 0; 854 } 855 856 static int wm8978_set_bias_level(struct snd_soc_codec *codec, 857 enum snd_soc_bias_level level) 858 { 859 u16 power1 = snd_soc_read(codec, WM8978_POWER_MANAGEMENT_1) & ~3; 860 861 switch (level) { 862 case SND_SOC_BIAS_ON: 863 case SND_SOC_BIAS_PREPARE: 864 power1 |= 1; /* VMID 75k */ 865 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1, power1); 866 break; 867 case SND_SOC_BIAS_STANDBY: 868 /* bit 3: enable bias, bit 2: enable I/O tie off buffer */ 869 power1 |= 0xc; 870 871 if (snd_soc_codec_get_bias_level(codec) == SND_SOC_BIAS_OFF) { 872 /* Initial cap charge at VMID 5k */ 873 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1, 874 power1 | 0x3); 875 mdelay(100); 876 } 877 878 power1 |= 0x2; /* VMID 500k */ 879 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1, power1); 880 break; 881 case SND_SOC_BIAS_OFF: 882 /* Preserve PLL - OPCLK may be used by someone */ 883 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, ~0x20, 0); 884 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_2, 0); 885 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_3, 0); 886 break; 887 } 888 889 dev_dbg(codec->dev, "%s: %d, %x\n", __func__, level, power1); 890 891 return 0; 892 } 893 894 #define WM8978_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \ 895 SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE) 896 897 static const struct snd_soc_dai_ops wm8978_dai_ops = { 898 .hw_params = wm8978_hw_params, 899 .digital_mute = wm8978_mute, 900 .set_fmt = wm8978_set_dai_fmt, 901 .set_clkdiv = wm8978_set_dai_clkdiv, 902 .set_sysclk = wm8978_set_dai_sysclk, 903 }; 904 905 /* Also supports 12kHz */ 906 static struct snd_soc_dai_driver wm8978_dai = { 907 .name = "wm8978-hifi", 908 .playback = { 909 .stream_name = "Playback", 910 .channels_min = 1, 911 .channels_max = 2, 912 .rates = SNDRV_PCM_RATE_8000_48000, 913 .formats = WM8978_FORMATS, 914 }, 915 .capture = { 916 .stream_name = "Capture", 917 .channels_min = 1, 918 .channels_max = 2, 919 .rates = SNDRV_PCM_RATE_8000_48000, 920 .formats = WM8978_FORMATS, 921 }, 922 .ops = &wm8978_dai_ops, 923 .symmetric_rates = 1, 924 }; 925 926 static int wm8978_suspend(struct snd_soc_codec *codec) 927 { 928 struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec); 929 930 snd_soc_codec_force_bias_level(codec, SND_SOC_BIAS_OFF); 931 /* Also switch PLL off */ 932 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1, 0); 933 934 regcache_mark_dirty(wm8978->regmap); 935 936 return 0; 937 } 938 939 static int wm8978_resume(struct snd_soc_codec *codec) 940 { 941 struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec); 942 943 /* Sync reg_cache with the hardware */ 944 regcache_sync(wm8978->regmap); 945 946 snd_soc_codec_force_bias_level(codec, SND_SOC_BIAS_STANDBY); 947 948 if (wm8978->f_pllout) 949 /* Switch PLL on */ 950 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0x20); 951 952 return 0; 953 } 954 955 /* 956 * These registers contain an "update" bit - bit 8. This means, for example, 957 * that one can write new DAC digital volume for both channels, but only when 958 * the update bit is set, will also the volume be updated - simultaneously for 959 * both channels. 960 */ 961 static const int update_reg[] = { 962 WM8978_LEFT_DAC_DIGITAL_VOLUME, 963 WM8978_RIGHT_DAC_DIGITAL_VOLUME, 964 WM8978_LEFT_ADC_DIGITAL_VOLUME, 965 WM8978_RIGHT_ADC_DIGITAL_VOLUME, 966 WM8978_LEFT_INP_PGA_CONTROL, 967 WM8978_RIGHT_INP_PGA_CONTROL, 968 WM8978_LOUT1_HP_CONTROL, 969 WM8978_ROUT1_HP_CONTROL, 970 WM8978_LOUT2_SPK_CONTROL, 971 WM8978_ROUT2_SPK_CONTROL, 972 }; 973 974 static int wm8978_probe(struct snd_soc_codec *codec) 975 { 976 struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec); 977 int i; 978 979 /* 980 * Set default system clock to PLL, it is more precise, this is also the 981 * default hardware setting 982 */ 983 wm8978->sysclk = WM8978_PLL; 984 985 /* 986 * Set the update bit in all registers, that have one. This way all 987 * writes to those registers will also cause the update bit to be 988 * written. 989 */ 990 for (i = 0; i < ARRAY_SIZE(update_reg); i++) 991 snd_soc_update_bits(codec, update_reg[i], 0x100, 0x100); 992 993 return 0; 994 } 995 996 static const struct snd_soc_codec_driver soc_codec_dev_wm8978 = { 997 .probe = wm8978_probe, 998 .suspend = wm8978_suspend, 999 .resume = wm8978_resume, 1000 .set_bias_level = wm8978_set_bias_level, 1001 1002 .component_driver = { 1003 .controls = wm8978_snd_controls, 1004 .num_controls = ARRAY_SIZE(wm8978_snd_controls), 1005 .dapm_widgets = wm8978_dapm_widgets, 1006 .num_dapm_widgets = ARRAY_SIZE(wm8978_dapm_widgets), 1007 .dapm_routes = wm8978_dapm_routes, 1008 .num_dapm_routes = ARRAY_SIZE(wm8978_dapm_routes), 1009 }, 1010 }; 1011 1012 static const struct regmap_config wm8978_regmap_config = { 1013 .reg_bits = 7, 1014 .val_bits = 9, 1015 1016 .max_register = WM8978_MAX_REGISTER, 1017 .volatile_reg = wm8978_volatile, 1018 1019 .cache_type = REGCACHE_RBTREE, 1020 .reg_defaults = wm8978_reg_defaults, 1021 .num_reg_defaults = ARRAY_SIZE(wm8978_reg_defaults), 1022 }; 1023 1024 static int wm8978_i2c_probe(struct i2c_client *i2c, 1025 const struct i2c_device_id *id) 1026 { 1027 struct wm8978_priv *wm8978; 1028 int ret; 1029 1030 wm8978 = devm_kzalloc(&i2c->dev, sizeof(struct wm8978_priv), 1031 GFP_KERNEL); 1032 if (wm8978 == NULL) 1033 return -ENOMEM; 1034 1035 wm8978->regmap = devm_regmap_init_i2c(i2c, &wm8978_regmap_config); 1036 if (IS_ERR(wm8978->regmap)) { 1037 ret = PTR_ERR(wm8978->regmap); 1038 dev_err(&i2c->dev, "Failed to allocate regmap: %d\n", ret); 1039 return ret; 1040 } 1041 1042 i2c_set_clientdata(i2c, wm8978); 1043 1044 /* Reset the codec */ 1045 ret = regmap_write(wm8978->regmap, WM8978_RESET, 0); 1046 if (ret != 0) { 1047 dev_err(&i2c->dev, "Failed to issue reset: %d\n", ret); 1048 return ret; 1049 } 1050 1051 ret = snd_soc_register_codec(&i2c->dev, 1052 &soc_codec_dev_wm8978, &wm8978_dai, 1); 1053 if (ret != 0) { 1054 dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret); 1055 return ret; 1056 } 1057 1058 return 0; 1059 } 1060 1061 static int wm8978_i2c_remove(struct i2c_client *client) 1062 { 1063 snd_soc_unregister_codec(&client->dev); 1064 1065 return 0; 1066 } 1067 1068 static const struct i2c_device_id wm8978_i2c_id[] = { 1069 { "wm8978", 0 }, 1070 { } 1071 }; 1072 MODULE_DEVICE_TABLE(i2c, wm8978_i2c_id); 1073 1074 static struct i2c_driver wm8978_i2c_driver = { 1075 .driver = { 1076 .name = "wm8978", 1077 }, 1078 .probe = wm8978_i2c_probe, 1079 .remove = wm8978_i2c_remove, 1080 .id_table = wm8978_i2c_id, 1081 }; 1082 1083 module_i2c_driver(wm8978_i2c_driver); 1084 1085 MODULE_DESCRIPTION("ASoC WM8978 codec driver"); 1086 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>"); 1087 MODULE_LICENSE("GPL"); 1088