sound/soc/codecs/wm8978.c

   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 const SOC_ENUM_SINGLE_DECL(adc_compand, WM8978_COMPANDING_CONTROL, 1,
 121                                   wm8978_companding);
 122 static const SOC_ENUM_SINGLE_DECL(dac_compand, WM8978_COMPANDING_CONTROL, 3,
 123                                   wm8978_companding);
 124 static const SOC_ENUM_SINGLE_DECL(eqmode, WM8978_EQ1, 8, wm8978_eqmode);
 125 static const SOC_ENUM_SINGLE_DECL(eq1, WM8978_EQ1, 5, wm8978_eq1);
 126 static const SOC_ENUM_SINGLE_DECL(eq2bw, WM8978_EQ2, 8, wm8978_bw);
 127 static const SOC_ENUM_SINGLE_DECL(eq2, WM8978_EQ2, 5, wm8978_eq2);
 128 static const SOC_ENUM_SINGLE_DECL(eq3bw, WM8978_EQ3, 8, wm8978_bw);
 129 static const SOC_ENUM_SINGLE_DECL(eq3, WM8978_EQ3, 5, wm8978_eq3);
 130 static const SOC_ENUM_SINGLE_DECL(eq4bw, WM8978_EQ4, 8, wm8978_bw);
 131 static const SOC_ENUM_SINGLE_DECL(eq4, WM8978_EQ4, 5, wm8978_eq4);
 132 static const SOC_ENUM_SINGLE_DECL(eq5, WM8978_EQ5, 5, wm8978_eq5);
 133 static const SOC_ENUM_SINGLE_DECL(alc3, WM8978_ALC_CONTROL_3, 8, wm8978_alc3);
 134 static const 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 Bandwith", 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 Bandwith", 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 Bandwith", 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
 531                 /* GPIO1 into default mode as input - before configuring PLL */
 532                 snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 7, 0);
 533         } else {
 534                 return -EINVAL;
 535         }
 536
 537         f2 = wm8978->f_pllout * 4;
 538
 539         dev_dbg(codec->dev, "%s: f_MCLK=%uHz, f_PLLOUT=%uHz\n", __func__,
 540                 wm8978->f_mclk, wm8978->f_pllout);
 541
 542         pll_factors(codec, &pll_div, f2, wm8978->f_mclk);
 543
 544         dev_dbg(codec->dev, "%s: calculated PLL N=0x%x, K=0x%x, div2=%d\n",
 545                 __func__, pll_div.n, pll_div.k, pll_div.div2);
 546
 547         /* Turn PLL off for configuration... */
 548         snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0);
 549
 550         snd_soc_write(codec, WM8978_PLL_N, (pll_div.div2 << 4) | pll_div.n);
 551         snd_soc_write(codec, WM8978_PLL_K1, pll_div.k >> 18);
 552         snd_soc_write(codec, WM8978_PLL_K2, (pll_div.k >> 9) & 0x1ff);
 553         snd_soc_write(codec, WM8978_PLL_K3, pll_div.k & 0x1ff);
 554
 555         /* ...and on again */
 556         snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0x20);
 557
 558         if (f_opclk)
 559                 /* Output PLL (OPCLK) to GPIO1 */
 560                 snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 7, 4);
 561
 562         return 0;
 563 }
 564
 565 /*
 566  * Configure WM8978 clock dividers.
 567  */
 568 static int wm8978_set_dai_clkdiv(struct snd_soc_dai *codec_dai,
 569                                  int div_id, int div)
 570 {
 571         struct snd_soc_codec *codec = codec_dai->codec;
 572         struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec);
 573         int ret = 0;
 574
 575         switch (div_id) {
 576         case WM8978_OPCLKRATE:
 577                 wm8978->f_opclk = div;
 578
 579                 if (wm8978->f_mclk)
 580                         /*
 581                          * We know the MCLK frequency, the user has requested
 582                          * OPCLK, configure the PLL based on that and start it
 583                          * and OPCLK immediately. We will configure PLL to match
 584                          * user-requested OPCLK frquency as good as possible.
 585                          * In fact, it is likely, that matching the sampling
 586                          * rate, when it becomes known, is more important, and
 587                          * we will not be reconfiguring PLL then, because we
 588                          * must not interrupt OPCLK. But it should be fine,
 589                          * because typically the user will request OPCLK to run
 590                          * at 256fs or 512fs, and for these cases we will also
 591                          * find an exact MCLK divider configuration - it will
 592                          * be equal to or double the OPCLK divisor.
 593                          */
 594                         ret = wm8978_configure_pll(codec);
 595                 break;
 596         case WM8978_BCLKDIV:
 597                 if (div & ~0x1c)
 598                         return -EINVAL;
 599                 snd_soc_update_bits(codec, WM8978_CLOCKING, 0x1c, div);
 600                 break;
 601         default:
 602                 return -EINVAL;
 603         }
 604
 605         dev_dbg(codec->dev, "%s: ID %d, value %u\n", __func__, div_id, div);
 606
 607         return ret;
 608 }
 609
 610 /*
 611  * @freq:       when .set_pll() us not used, freq is codec MCLK input frequency
 612  */
 613 static int wm8978_set_dai_sysclk(struct snd_soc_dai *codec_dai, int clk_id,
 614                                  unsigned int freq, int dir)
 615 {
 616         struct snd_soc_codec *codec = codec_dai->codec;
 617         struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec);
 618         int ret = 0;
 619
 620         dev_dbg(codec->dev, "%s: ID %d, freq %u\n", __func__, clk_id, freq);
 621
 622         if (freq) {
 623                 wm8978->f_mclk = freq;
 624
 625                 /* Even if MCLK is used for system clock, might have to drive OPCLK */
 626                 if (wm8978->f_opclk)
 627                         ret = wm8978_configure_pll(codec);
 628
 629                 /* Our sysclk is fixed to 256 * fs, will configure in .hw_params()  */
 630
 631                 if (!ret)
 632                         wm8978->sysclk = clk_id;
 633         }
 634
 635         if (wm8978->sysclk == WM8978_PLL && (!freq || clk_id == WM8978_MCLK)) {
 636                 /* Clock CODEC directly from MCLK */
 637                 snd_soc_update_bits(codec, WM8978_CLOCKING, 0x100, 0);
 638
 639                 /* GPIO1 into default mode as input - before configuring PLL */
 640                 snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 7, 0);
 641
 642                 /* Turn off PLL */
 643                 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0);
 644                 wm8978->sysclk = WM8978_MCLK;
 645                 wm8978->f_pllout = 0;
 646                 wm8978->f_opclk = 0;
 647         }
 648
 649         return ret;
 650 }
 651
 652 /*
 653  * Set ADC and Voice DAC format.
 654  */
 655 static int wm8978_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
 656 {
 657         struct snd_soc_codec *codec = codec_dai->codec;
 658         /*
 659          * BCLK polarity mask = 0x100, LRC clock polarity mask = 0x80,
 660          * Data Format mask = 0x18: all will be calculated anew
 661          */
 662         u16 iface = snd_soc_read(codec, WM8978_AUDIO_INTERFACE) & ~0x198;
 663         u16 clk = snd_soc_read(codec, WM8978_CLOCKING);
 664
 665         dev_dbg(codec->dev, "%s\n", __func__);
 666
 667         /* set master/slave audio interface */
 668         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 669         case SND_SOC_DAIFMT_CBM_CFM:
 670                 clk |= 1;
 671                 break;
 672         case SND_SOC_DAIFMT_CBS_CFS:
 673                 clk &= ~1;
 674                 break;
 675         default:
 676                 return -EINVAL;
 677         }
 678
 679         /* interface format */
 680         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 681         case SND_SOC_DAIFMT_I2S:
 682                 iface |= 0x10;
 683                 break;
 684         case SND_SOC_DAIFMT_RIGHT_J:
 685                 break;
 686         case SND_SOC_DAIFMT_LEFT_J:
 687                 iface |= 0x8;
 688                 break;
 689         case SND_SOC_DAIFMT_DSP_A:
 690                 iface |= 0x18;
 691                 break;
 692         default:
 693                 return -EINVAL;
 694         }
 695
 696         /* clock inversion */
 697         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 698         case SND_SOC_DAIFMT_NB_NF:
 699                 break;
 700         case SND_SOC_DAIFMT_IB_IF:
 701                 iface |= 0x180;
 702                 break;
 703         case SND_SOC_DAIFMT_IB_NF:
 704                 iface |= 0x100;
 705                 break;
 706         case SND_SOC_DAIFMT_NB_IF:
 707                 iface |= 0x80;
 708                 break;
 709         default:
 710                 return -EINVAL;
 711         }
 712
 713         snd_soc_write(codec, WM8978_AUDIO_INTERFACE, iface);
 714         snd_soc_write(codec, WM8978_CLOCKING, clk);
 715
 716         return 0;
 717 }
 718
 719 /*
 720  * Set PCM DAI bit size and sample rate.
 721  */
 722 static int wm8978_hw_params(struct snd_pcm_substream *substream,
 723                             struct snd_pcm_hw_params *params,
 724                             struct snd_soc_dai *dai)
 725 {
 726         struct snd_soc_codec *codec = dai->codec;
 727         struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec);
 728         /* Word length mask = 0x60 */
 729         u16 iface_ctl = snd_soc_read(codec, WM8978_AUDIO_INTERFACE) & ~0x60;
 730         /* Sampling rate mask = 0xe (for filters) */
 731         u16 add_ctl = snd_soc_read(codec, WM8978_ADDITIONAL_CONTROL) & ~0xe;
 732         u16 clking = snd_soc_read(codec, WM8978_CLOCKING);
 733         enum wm8978_sysclk_src current_clk_id = clking & 0x100 ?
 734                 WM8978_PLL : WM8978_MCLK;
 735         unsigned int f_sel, diff, diff_best = INT_MAX;
 736         int i, best = 0;
 737
 738         if (!wm8978->f_mclk)
 739                 return -EINVAL;
 740
 741         /* bit size */
 742         switch (params_format(params)) {
 743         case SNDRV_PCM_FORMAT_S16_LE:
 744                 break;
 745         case SNDRV_PCM_FORMAT_S20_3LE:
 746                 iface_ctl |= 0x20;
 747                 break;
 748         case SNDRV_PCM_FORMAT_S24_LE:
 749                 iface_ctl |= 0x40;
 750                 break;
 751         case SNDRV_PCM_FORMAT_S32_LE:
 752                 iface_ctl |= 0x60;
 753                 break;
 754         }
 755
 756         /* filter coefficient */
 757         switch (params_rate(params)) {
 758         case 8000:
 759                 add_ctl |= 0x5 << 1;
 760                 break;
 761         case 11025:
 762                 add_ctl |= 0x4 << 1;
 763                 break;
 764         case 16000:
 765                 add_ctl |= 0x3 << 1;
 766                 break;
 767         case 22050:
 768                 add_ctl |= 0x2 << 1;
 769                 break;
 770         case 32000:
 771                 add_ctl |= 0x1 << 1;
 772                 break;
 773         case 44100:
 774         case 48000:
 775                 break;
 776         }
 777
 778         /* Sampling rate is known now, can configure the MCLK divider */
 779         wm8978->f_256fs = params_rate(params) * 256;
 780
 781         if (wm8978->sysclk == WM8978_MCLK) {
 782                 wm8978->mclk_idx = -1;
 783                 f_sel = wm8978->f_mclk;
 784         } else {
 785                 if (!wm8978->f_pllout) {
 786                         /* We only enter here, if OPCLK is not used */
 787                         int ret = wm8978_configure_pll(codec);
 788                         if (ret < 0)
 789                                 return ret;
 790                 }
 791                 f_sel = wm8978->f_pllout;
 792         }
 793
 794         if (wm8978->mclk_idx < 0) {
 795                 /* Either MCLK is used directly, or OPCLK is used */
 796                 if (f_sel < wm8978->f_256fs || f_sel > 12 * wm8978->f_256fs)
 797                         return -EINVAL;
 798
 799                 for (i = 0; i < ARRAY_SIZE(mclk_numerator); i++) {
 800                         diff = abs(wm8978->f_256fs * 3 -
 801                                    f_sel * 3 * mclk_denominator[i] / mclk_numerator[i]);
 802
 803                         if (diff < diff_best) {
 804                                 diff_best = diff;
 805                                 best = i;
 806                         }
 807
 808                         if (!diff)
 809                                 break;
 810                 }
 811         } else {
 812                 /* OPCLK not used, codec driven by PLL */
 813                 best = wm8978->mclk_idx;
 814                 diff = 0;
 815         }
 816
 817         if (diff)
 818                 dev_warn(codec->dev, "Imprecise sampling rate: %uHz%s\n",
 819                         f_sel * mclk_denominator[best] / mclk_numerator[best] / 256,
 820                         wm8978->sysclk == WM8978_MCLK ?
 821                         ", consider using PLL" : "");
 822
 823         dev_dbg(codec->dev, "%s: fmt %d, rate %u, MCLK divisor #%d\n", __func__,
 824                 params_format(params), params_rate(params), best);
 825
 826         /* MCLK divisor mask = 0xe0 */
 827         snd_soc_update_bits(codec, WM8978_CLOCKING, 0xe0, best << 5);
 828
 829         snd_soc_write(codec, WM8978_AUDIO_INTERFACE, iface_ctl);
 830         snd_soc_write(codec, WM8978_ADDITIONAL_CONTROL, add_ctl);
 831
 832         if (wm8978->sysclk != current_clk_id) {
 833                 if (wm8978->sysclk == WM8978_PLL)
 834                         /* Run CODEC from PLL instead of MCLK */
 835                         snd_soc_update_bits(codec, WM8978_CLOCKING,
 836                                             0x100, 0x100);
 837                 else
 838                         /* Clock CODEC directly from MCLK */
 839                         snd_soc_update_bits(codec, WM8978_CLOCKING, 0x100, 0);
 840         }
 841
 842         return 0;
 843 }
 844
 845 static int wm8978_mute(struct snd_soc_dai *dai, int mute)
 846 {
 847         struct snd_soc_codec *codec = dai->codec;
 848
 849         dev_dbg(codec->dev, "%s: %d\n", __func__, mute);
 850
 851         if (mute)
 852                 snd_soc_update_bits(codec, WM8978_DAC_CONTROL, 0x40, 0x40);
 853         else
 854                 snd_soc_update_bits(codec, WM8978_DAC_CONTROL, 0x40, 0);
 855
 856         return 0;
 857 }
 858
 859 static int wm8978_set_bias_level(struct snd_soc_codec *codec,
 860                                  enum snd_soc_bias_level level)
 861 {
 862         u16 power1 = snd_soc_read(codec, WM8978_POWER_MANAGEMENT_1) & ~3;
 863
 864         switch (level) {
 865         case SND_SOC_BIAS_ON:
 866         case SND_SOC_BIAS_PREPARE:
 867                 power1 |= 1;  /* VMID 75k */
 868                 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1, power1);
 869                 break;
 870         case SND_SOC_BIAS_STANDBY:
 871                 /* bit 3: enable bias, bit 2: enable I/O tie off buffer */
 872                 power1 |= 0xc;
 873
 874                 if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
 875                         /* Initial cap charge at VMID 5k */
 876                         snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1,
 877                                       power1 | 0x3);
 878                         mdelay(100);
 879                 }
 880
 881                 power1 |= 0x2;  /* VMID 500k */
 882                 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1, power1);
 883                 break;
 884         case SND_SOC_BIAS_OFF:
 885                 /* Preserve PLL - OPCLK may be used by someone */
 886                 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, ~0x20, 0);
 887                 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_2, 0);
 888                 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_3, 0);
 889                 break;
 890         }
 891
 892         dev_dbg(codec->dev, "%s: %d, %x\n", __func__, level, power1);
 893
 894         codec->dapm.bias_level = level;
 895         return 0;
 896 }
 897
 898 #define WM8978_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \
 899         SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
 900
 901 static const struct snd_soc_dai_ops wm8978_dai_ops = {
 902         .hw_params      = wm8978_hw_params,
 903         .digital_mute   = wm8978_mute,
 904         .set_fmt        = wm8978_set_dai_fmt,
 905         .set_clkdiv     = wm8978_set_dai_clkdiv,
 906         .set_sysclk     = wm8978_set_dai_sysclk,
 907 };
 908
 909 /* Also supports 12kHz */
 910 static struct snd_soc_dai_driver wm8978_dai = {
 911         .name = "wm8978-hifi",
 912         .playback = {
 913                 .stream_name = "Playback",
 914                 .channels_min = 1,
 915                 .channels_max = 2,
 916                 .rates = SNDRV_PCM_RATE_8000_48000,
 917                 .formats = WM8978_FORMATS,
 918         },
 919         .capture = {
 920                 .stream_name = "Capture",
 921                 .channels_min = 1,
 922                 .channels_max = 2,
 923                 .rates = SNDRV_PCM_RATE_8000_48000,
 924                 .formats = WM8978_FORMATS,
 925         },
 926         .ops = &wm8978_dai_ops,
 927 };
 928
 929 static int wm8978_suspend(struct snd_soc_codec *codec)
 930 {
 931         struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec);
 932
 933         wm8978_set_bias_level(codec, SND_SOC_BIAS_OFF);
 934         /* Also switch PLL off */
 935         snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1, 0);
 936
 937         regcache_mark_dirty(wm8978->regmap);
 938
 939         return 0;
 940 }
 941
 942 static int wm8978_resume(struct snd_soc_codec *codec)
 943 {
 944         struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec);
 945
 946         /* Sync reg_cache with the hardware */
 947         regcache_sync(wm8978->regmap);
 948
 949         wm8978_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 950
 951         if (wm8978->f_pllout)
 952                 /* Switch PLL on */
 953                 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0x20);
 954
 955         return 0;
 956 }
 957
 958 /*
 959  * These registers contain an "update" bit - bit 8. This means, for example,
 960  * that one can write new DAC digital volume for both channels, but only when
 961  * the update bit is set, will also the volume be updated - simultaneously for
 962  * both channels.
 963  */
 964 static const int update_reg[] = {
 965         WM8978_LEFT_DAC_DIGITAL_VOLUME,
 966         WM8978_RIGHT_DAC_DIGITAL_VOLUME,
 967         WM8978_LEFT_ADC_DIGITAL_VOLUME,
 968         WM8978_RIGHT_ADC_DIGITAL_VOLUME,
 969         WM8978_LEFT_INP_PGA_CONTROL,
 970         WM8978_RIGHT_INP_PGA_CONTROL,
 971         WM8978_LOUT1_HP_CONTROL,
 972         WM8978_ROUT1_HP_CONTROL,
 973         WM8978_LOUT2_SPK_CONTROL,
 974         WM8978_ROUT2_SPK_CONTROL,
 975 };
 976
 977 static int wm8978_probe(struct snd_soc_codec *codec)
 978 {
 979         struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec);
 980         int ret = 0, i;
 981
 982         /*
 983          * Set default system clock to PLL, it is more precise, this is also the
 984          * default hardware setting
 985          */
 986         wm8978->sysclk = WM8978_PLL;
 987         codec->control_data = wm8978->regmap;
 988         ret = snd_soc_codec_set_cache_io(codec, 7, 9, SND_SOC_REGMAP);
 989         if (ret < 0) {
 990                 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
 991                 return ret;
 992         }
 993
 994         /*
 995          * Set the update bit in all registers, that have one. This way all
 996          * writes to those registers will also cause the update bit to be
 997          * written.
 998          */
 999         for (i = 0; i < ARRAY_SIZE(update_reg); i++)
1000                 snd_soc_update_bits(codec, update_reg[i], 0x100, 0x100);
1001
1002         wm8978_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
1003
1004         return 0;
1005 }
1006
1007 /* power down chip */
1008 static int wm8978_remove(struct snd_soc_codec *codec)
1009 {
1010         wm8978_set_bias_level(codec, SND_SOC_BIAS_OFF);
1011         return 0;
1012 }
1013
1014 static struct snd_soc_codec_driver soc_codec_dev_wm8978 = {
1015         .probe =        wm8978_probe,
1016         .remove =       wm8978_remove,
1017         .suspend =      wm8978_suspend,
1018         .resume =       wm8978_resume,
1019         .set_bias_level = wm8978_set_bias_level,
1020
1021         .controls = wm8978_snd_controls,
1022         .num_controls = ARRAY_SIZE(wm8978_snd_controls),
1023         .dapm_widgets = wm8978_dapm_widgets,
1024         .num_dapm_widgets = ARRAY_SIZE(wm8978_dapm_widgets),
1025         .dapm_routes = wm8978_dapm_routes,
1026         .num_dapm_routes = ARRAY_SIZE(wm8978_dapm_routes),
1027 };
1028
1029 static const struct regmap_config wm8978_regmap_config = {
1030         .reg_bits = 7,
1031         .val_bits = 9,
1032
1033         .max_register = WM8978_MAX_REGISTER,
1034         .volatile_reg = wm8978_volatile,
1035
1036         .cache_type = REGCACHE_RBTREE,
1037         .reg_defaults = wm8978_reg_defaults,
1038         .num_reg_defaults = ARRAY_SIZE(wm8978_reg_defaults),
1039 };
1040
1041 static __devinit int wm8978_i2c_probe(struct i2c_client *i2c,
1042                                       const struct i2c_device_id *id)
1043 {
1044         struct wm8978_priv *wm8978;
1045         int ret;
1046
1047         wm8978 = devm_kzalloc(&i2c->dev, sizeof(struct wm8978_priv),
1048                               GFP_KERNEL);
1049         if (wm8978 == NULL)
1050                 return -ENOMEM;
1051
1052         wm8978->regmap = regmap_init_i2c(i2c, &wm8978_regmap_config);
1053         if (IS_ERR(wm8978->regmap)) {
1054                 ret = PTR_ERR(wm8978->regmap);
1055                 dev_err(&i2c->dev, "Failed to allocate regmap: %d\n", ret);
1056                 return ret;
1057         }
1058
1059         i2c_set_clientdata(i2c, wm8978);
1060
1061         /* Reset the codec */
1062         ret = regmap_write(wm8978->regmap, WM8978_RESET, 0);
1063         if (ret != 0) {
1064                 dev_err(&i2c->dev, "Failed to issue reset: %d\n", ret);
1065                 goto err;
1066         }
1067
1068         ret = snd_soc_register_codec(&i2c->dev,
1069                         &soc_codec_dev_wm8978, &wm8978_dai, 1);
1070         if (ret != 0) {
1071                 dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret);
1072                 goto err;
1073         }
1074
1075         return 0;
1076
1077 err:
1078         regmap_exit(wm8978->regmap);
1079         return ret;
1080 }
1081
1082 static __devexit int wm8978_i2c_remove(struct i2c_client *client)
1083 {
1084         struct wm8978_priv *wm8978 = i2c_get_clientdata(client);
1085
1086         snd_soc_unregister_codec(&client->dev);
1087         regmap_exit(wm8978->regmap);
1088
1089         return 0;
1090 }
1091
1092 static const struct i2c_device_id wm8978_i2c_id[] = {
1093         { "wm8978", 0 },
1094         { }
1095 };
1096 MODULE_DEVICE_TABLE(i2c, wm8978_i2c_id);
1097
1098 static struct i2c_driver wm8978_i2c_driver = {
1099         .driver = {
1100                 .name = "wm8978",
1101                 .owner = THIS_MODULE,
1102         },
1103         .probe =    wm8978_i2c_probe,
1104         .remove =   __devexit_p(wm8978_i2c_remove),
1105         .id_table = wm8978_i2c_id,
1106 };
1107
1108 static int __init wm8978_modinit(void)
1109 {
1110         int ret = 0;
1111         ret = i2c_add_driver(&wm8978_i2c_driver);
1112         if (ret != 0) {
1113                 printk(KERN_ERR "Failed to register WM8978 I2C driver: %d\n",
1114                        ret);
1115         }
1116         return ret;
1117 }
1118 module_init(wm8978_modinit);
1119
1120 static void __exit wm8978_exit(void)
1121 {
1122         i2c_del_driver(&wm8978_i2c_driver);
1123 }
1124 module_exit(wm8978_exit);
1125
1126 MODULE_DESCRIPTION("ASoC WM8978 codec driver");
1127 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
1128 MODULE_LICENSE("GPL");