sound/soc/codecs/wm8940.c

   1 /*
   2  * wm8940.c  --  WM8940 ALSA Soc Audio driver
   3  *
   4  * Author: Jonathan Cameron <jic23@cam.ac.uk>
   5  *
   6  * Based on wm8510.c
   7  *    Copyright  2006 Wolfson Microelectronics PLC.
   8  *    Author:  Liam Girdwood <lrg@slimlogic.co.uk>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  * Not currently handled:
  15  * Notch filter control
  16  * AUXMode (inverting vs mixer)
  17  * No means to obtain current gain if alc enabled.
  18  * No use made of gpio
  19  * Fast VMID discharge for power down
  20  * Soft Start
  21  * DLR and ALR Swaps not enabled
  22  * Digital Sidetone not supported
  23  */
  24 #include <linux/module.h>
  25 #include <linux/moduleparam.h>
  26 #include <linux/kernel.h>
  27 #include <linux/init.h>
  28 #include <linux/delay.h>
  29 #include <linux/pm.h>
  30 #include <linux/i2c.h>
  31 #include <linux/spi/spi.h>
  32 #include <linux/slab.h>
  33 #include <sound/core.h>
  34 #include <sound/pcm.h>
  35 #include <sound/pcm_params.h>
  36 #include <sound/soc.h>
  37 #include <sound/initval.h>
  38 #include <sound/tlv.h>
  39
  40 #include "wm8940.h"
  41
  42 struct wm8940_priv {
  43         unsigned int sysclk;
  44         enum snd_soc_control_type control_type;
  45 };
  46
  47 static int wm8940_volatile_register(struct snd_soc_codec *codec,
  48                                     unsigned int reg)
  49 {
  50         switch (reg) {
  51         case WM8940_SOFTRESET:
  52                 return 1;
  53         default:
  54                 return 0;
  55         }
  56 }
  57
  58 static u16 wm8940_reg_defaults[] = {
  59         0x8940, /* Soft Reset */
  60         0x0000, /* Power 1 */
  61         0x0000, /* Power 2 */
  62         0x0000, /* Power 3 */
  63         0x0010, /* Interface Control */
  64         0x0000, /* Companding Control */
  65         0x0140, /* Clock Control */
  66         0x0000, /* Additional Controls */
  67         0x0000, /* GPIO Control */
  68         0x0002, /* Auto Increment Control */
  69         0x0000, /* DAC Control */
  70         0x00FF, /* DAC Volume */
  71         0,
  72         0,
  73         0x0100, /* ADC Control */
  74         0x00FF, /* ADC Volume */
  75         0x0000, /* Notch Filter 1 Control 1 */
  76         0x0000, /* Notch Filter 1 Control 2 */
  77         0x0000, /* Notch Filter 2 Control 1 */
  78         0x0000, /* Notch Filter 2 Control 2 */
  79         0x0000, /* Notch Filter 3 Control 1 */
  80         0x0000, /* Notch Filter 3 Control 2 */
  81         0x0000, /* Notch Filter 4 Control 1 */
  82         0x0000, /* Notch Filter 4 Control 2 */
  83         0x0032, /* DAC Limit Control 1 */
  84         0x0000, /* DAC Limit Control 2 */
  85         0,
  86         0,
  87         0,
  88         0,
  89         0,
  90         0,
  91         0x0038, /* ALC Control 1 */
  92         0x000B, /* ALC Control 2 */
  93         0x0032, /* ALC Control 3 */
  94         0x0000, /* Noise Gate */
  95         0x0041, /* PLLN */
  96         0x000C, /* PLLK1 */
  97         0x0093, /* PLLK2 */
  98         0x00E9, /* PLLK3 */
  99         0,
 100         0,
 101         0x0030, /* ALC Control 4 */
 102         0,
 103         0x0002, /* Input Control */
 104         0x0050, /* PGA Gain */
 105         0,
 106         0x0002, /* ADC Boost Control */
 107         0,
 108         0x0002, /* Output Control */
 109         0x0000, /* Speaker Mixer Control */
 110         0,
 111         0,
 112         0,
 113         0x0079, /* Speaker Volume */
 114         0,
 115         0x0000, /* Mono Mixer Control */
 116 };
 117
 118 static const char *wm8940_companding[] = { "Off", "NC", "u-law", "A-law" };
 119 static const struct soc_enum wm8940_adc_companding_enum
 120 = SOC_ENUM_SINGLE(WM8940_COMPANDINGCTL, 1, 4, wm8940_companding);
 121 static const struct soc_enum wm8940_dac_companding_enum
 122 = SOC_ENUM_SINGLE(WM8940_COMPANDINGCTL, 3, 4, wm8940_companding);
 123
 124 static const char *wm8940_alc_mode_text[] = {"ALC", "Limiter"};
 125 static const struct soc_enum wm8940_alc_mode_enum
 126 = SOC_ENUM_SINGLE(WM8940_ALC3, 8, 2, wm8940_alc_mode_text);
 127
 128 static const char *wm8940_mic_bias_level_text[] = {"0.9", "0.65"};
 129 static const struct soc_enum wm8940_mic_bias_level_enum
 130 = SOC_ENUM_SINGLE(WM8940_INPUTCTL, 8, 2, wm8940_mic_bias_level_text);
 131
 132 static const char *wm8940_filter_mode_text[] = {"Audio", "Application"};
 133 static const struct soc_enum wm8940_filter_mode_enum
 134 = SOC_ENUM_SINGLE(WM8940_ADC, 7, 2, wm8940_filter_mode_text);
 135
 136 static DECLARE_TLV_DB_SCALE(wm8940_spk_vol_tlv, -5700, 100, 1);
 137 static DECLARE_TLV_DB_SCALE(wm8940_att_tlv, -1000, 1000, 0);
 138 static DECLARE_TLV_DB_SCALE(wm8940_pga_vol_tlv, -1200, 75, 0);
 139 static DECLARE_TLV_DB_SCALE(wm8940_alc_min_tlv, -1200, 600, 0);
 140 static DECLARE_TLV_DB_SCALE(wm8940_alc_max_tlv, 675, 600, 0);
 141 static DECLARE_TLV_DB_SCALE(wm8940_alc_tar_tlv, -2250, 50, 0);
 142 static DECLARE_TLV_DB_SCALE(wm8940_lim_boost_tlv, 0, 100, 0);
 143 static DECLARE_TLV_DB_SCALE(wm8940_lim_thresh_tlv, -600, 100, 0);
 144 static DECLARE_TLV_DB_SCALE(wm8940_adc_tlv, -12750, 50, 1);
 145 static DECLARE_TLV_DB_SCALE(wm8940_capture_boost_vol_tlv, 0, 2000, 0);
 146
 147 static const struct snd_kcontrol_new wm8940_snd_controls[] = {
 148         SOC_SINGLE("Digital Loopback Switch", WM8940_COMPANDINGCTL,
 149                    6, 1, 0),
 150         SOC_ENUM("DAC Companding", wm8940_dac_companding_enum),
 151         SOC_ENUM("ADC Companding", wm8940_adc_companding_enum),
 152
 153         SOC_ENUM("ALC Mode", wm8940_alc_mode_enum),
 154         SOC_SINGLE("ALC Switch", WM8940_ALC1, 8, 1, 0),
 155         SOC_SINGLE_TLV("ALC Capture Max Gain", WM8940_ALC1,
 156                        3, 7, 1, wm8940_alc_max_tlv),
 157         SOC_SINGLE_TLV("ALC Capture Min Gain", WM8940_ALC1,
 158                        0, 7, 0, wm8940_alc_min_tlv),
 159         SOC_SINGLE_TLV("ALC Capture Target", WM8940_ALC2,
 160                        0, 14, 0, wm8940_alc_tar_tlv),
 161         SOC_SINGLE("ALC Capture Hold", WM8940_ALC2, 4, 10, 0),
 162         SOC_SINGLE("ALC Capture Decay", WM8940_ALC3, 4, 10, 0),
 163         SOC_SINGLE("ALC Capture Attach", WM8940_ALC3, 0, 10, 0),
 164         SOC_SINGLE("ALC ZC Switch", WM8940_ALC4, 1, 1, 0),
 165         SOC_SINGLE("ALC Capture Noise Gate Switch", WM8940_NOISEGATE,
 166                    3, 1, 0),
 167         SOC_SINGLE("ALC Capture Noise Gate Threshold", WM8940_NOISEGATE,
 168                    0, 7, 0),
 169
 170         SOC_SINGLE("DAC Playback Limiter Switch", WM8940_DACLIM1, 8, 1, 0),
 171         SOC_SINGLE("DAC Playback Limiter Attack", WM8940_DACLIM1, 0, 9, 0),
 172         SOC_SINGLE("DAC Playback Limiter Decay", WM8940_DACLIM1, 4, 11, 0),
 173         SOC_SINGLE_TLV("DAC Playback Limiter Threshold", WM8940_DACLIM2,
 174                        4, 9, 1, wm8940_lim_thresh_tlv),
 175         SOC_SINGLE_TLV("DAC Playback Limiter Boost", WM8940_DACLIM2,
 176                        0, 12, 0, wm8940_lim_boost_tlv),
 177
 178         SOC_SINGLE("Capture PGA ZC Switch", WM8940_PGAGAIN, 7, 1, 0),
 179         SOC_SINGLE_TLV("Capture PGA Volume", WM8940_PGAGAIN,
 180                        0, 63, 0, wm8940_pga_vol_tlv),
 181         SOC_SINGLE_TLV("Digital Playback Volume", WM8940_DACVOL,
 182                        0, 255, 0, wm8940_adc_tlv),
 183         SOC_SINGLE_TLV("Digital Capture Volume", WM8940_ADCVOL,
 184                        0, 255, 0, wm8940_adc_tlv),
 185         SOC_ENUM("Mic Bias Level", wm8940_mic_bias_level_enum),
 186         SOC_SINGLE_TLV("Capture Boost Volue", WM8940_ADCBOOST,
 187                        8, 1, 0, wm8940_capture_boost_vol_tlv),
 188         SOC_SINGLE_TLV("Speaker Playback Volume", WM8940_SPKVOL,
 189                        0, 63, 0, wm8940_spk_vol_tlv),
 190         SOC_SINGLE("Speaker Playback Switch", WM8940_SPKVOL,  6, 1, 1),
 191
 192         SOC_SINGLE_TLV("Speaker Mixer Line Bypass Volume", WM8940_SPKVOL,
 193                        8, 1, 1, wm8940_att_tlv),
 194         SOC_SINGLE("Speaker Playback ZC Switch", WM8940_SPKVOL, 7, 1, 0),
 195
 196         SOC_SINGLE("Mono Out Switch", WM8940_MONOMIX, 6, 1, 1),
 197         SOC_SINGLE_TLV("Mono Mixer Line Bypass Volume", WM8940_MONOMIX,
 198                        7, 1, 1, wm8940_att_tlv),
 199
 200         SOC_SINGLE("High Pass Filter Switch", WM8940_ADC, 8, 1, 0),
 201         SOC_ENUM("High Pass Filter Mode", wm8940_filter_mode_enum),
 202         SOC_SINGLE("High Pass Filter Cut Off", WM8940_ADC, 4, 7, 0),
 203         SOC_SINGLE("ADC Inversion Switch", WM8940_ADC, 0, 1, 0),
 204         SOC_SINGLE("DAC Inversion Switch", WM8940_DAC, 0, 1, 0),
 205         SOC_SINGLE("DAC Auto Mute Switch", WM8940_DAC, 2, 1, 0),
 206         SOC_SINGLE("ZC Timeout Clock Switch", WM8940_ADDCNTRL, 0, 1, 0),
 207 };
 208
 209 static const struct snd_kcontrol_new wm8940_speaker_mixer_controls[] = {
 210         SOC_DAPM_SINGLE("Line Bypass Switch", WM8940_SPKMIX, 1, 1, 0),
 211         SOC_DAPM_SINGLE("Aux Playback Switch", WM8940_SPKMIX, 5, 1, 0),
 212         SOC_DAPM_SINGLE("PCM Playback Switch", WM8940_SPKMIX, 0, 1, 0),
 213 };
 214
 215 static const struct snd_kcontrol_new wm8940_mono_mixer_controls[] = {
 216         SOC_DAPM_SINGLE("Line Bypass Switch", WM8940_MONOMIX, 1, 1, 0),
 217         SOC_DAPM_SINGLE("Aux Playback Switch", WM8940_MONOMIX, 2, 1, 0),
 218         SOC_DAPM_SINGLE("PCM Playback Switch", WM8940_MONOMIX, 0, 1, 0),
 219 };
 220
 221 static DECLARE_TLV_DB_SCALE(wm8940_boost_vol_tlv, -1500, 300, 1);
 222 static const struct snd_kcontrol_new wm8940_input_boost_controls[] = {
 223         SOC_DAPM_SINGLE("Mic PGA Switch", WM8940_PGAGAIN, 6, 1, 1),
 224         SOC_DAPM_SINGLE_TLV("Aux Volume", WM8940_ADCBOOST,
 225                             0, 7, 0, wm8940_boost_vol_tlv),
 226         SOC_DAPM_SINGLE_TLV("Mic Volume", WM8940_ADCBOOST,
 227                             4, 7, 0, wm8940_boost_vol_tlv),
 228 };
 229
 230 static const struct snd_kcontrol_new wm8940_micpga_controls[] = {
 231         SOC_DAPM_SINGLE("AUX Switch", WM8940_INPUTCTL, 2, 1, 0),
 232         SOC_DAPM_SINGLE("MICP Switch", WM8940_INPUTCTL, 0, 1, 0),
 233         SOC_DAPM_SINGLE("MICN Switch", WM8940_INPUTCTL, 1, 1, 0),
 234 };
 235
 236 static const struct snd_soc_dapm_widget wm8940_dapm_widgets[] = {
 237         SND_SOC_DAPM_MIXER("Speaker Mixer", WM8940_POWER3, 2, 0,
 238                            &wm8940_speaker_mixer_controls[0],
 239                            ARRAY_SIZE(wm8940_speaker_mixer_controls)),
 240         SND_SOC_DAPM_MIXER("Mono Mixer", WM8940_POWER3, 3, 0,
 241                            &wm8940_mono_mixer_controls[0],
 242                            ARRAY_SIZE(wm8940_mono_mixer_controls)),
 243         SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8940_POWER3, 0, 0),
 244
 245         SND_SOC_DAPM_PGA("SpkN Out", WM8940_POWER3, 5, 0, NULL, 0),
 246         SND_SOC_DAPM_PGA("SpkP Out", WM8940_POWER3, 6, 0, NULL, 0),
 247         SND_SOC_DAPM_PGA("Mono Out", WM8940_POWER3, 7, 0, NULL, 0),
 248         SND_SOC_DAPM_OUTPUT("MONOOUT"),
 249         SND_SOC_DAPM_OUTPUT("SPKOUTP"),
 250         SND_SOC_DAPM_OUTPUT("SPKOUTN"),
 251
 252         SND_SOC_DAPM_PGA("Aux Input", WM8940_POWER1, 6, 0, NULL, 0),
 253         SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8940_POWER2, 0, 0),
 254         SND_SOC_DAPM_MIXER("Mic PGA", WM8940_POWER2, 2, 0,
 255                            &wm8940_micpga_controls[0],
 256                            ARRAY_SIZE(wm8940_micpga_controls)),
 257         SND_SOC_DAPM_MIXER("Boost Mixer", WM8940_POWER2, 4, 0,
 258                            &wm8940_input_boost_controls[0],
 259                            ARRAY_SIZE(wm8940_input_boost_controls)),
 260         SND_SOC_DAPM_MICBIAS("Mic Bias", WM8940_POWER1, 4, 0),
 261
 262         SND_SOC_DAPM_INPUT("MICN"),
 263         SND_SOC_DAPM_INPUT("MICP"),
 264         SND_SOC_DAPM_INPUT("AUX"),
 265 };
 266
 267 static const struct snd_soc_dapm_route audio_map[] = {
 268         /* Mono output mixer */
 269         {"Mono Mixer", "PCM Playback Switch", "DAC"},
 270         {"Mono Mixer", "Aux Playback Switch", "Aux Input"},
 271         {"Mono Mixer", "Line Bypass Switch", "Boost Mixer"},
 272
 273         /* Speaker output mixer */
 274         {"Speaker Mixer", "PCM Playback Switch", "DAC"},
 275         {"Speaker Mixer", "Aux Playback Switch", "Aux Input"},
 276         {"Speaker Mixer", "Line Bypass Switch", "Boost Mixer"},
 277
 278         /* Outputs */
 279         {"Mono Out", NULL, "Mono Mixer"},
 280         {"MONOOUT", NULL, "Mono Out"},
 281         {"SpkN Out", NULL, "Speaker Mixer"},
 282         {"SpkP Out", NULL, "Speaker Mixer"},
 283         {"SPKOUTN", NULL, "SpkN Out"},
 284         {"SPKOUTP", NULL, "SpkP Out"},
 285
 286         /*  Microphone PGA */
 287         {"Mic PGA", "MICN Switch", "MICN"},
 288         {"Mic PGA", "MICP Switch", "MICP"},
 289         {"Mic PGA", "AUX Switch", "AUX"},
 290
 291         /* Boost Mixer */
 292         {"Boost Mixer", "Mic PGA Switch", "Mic PGA"},
 293         {"Boost Mixer", "Mic Volume",  "MICP"},
 294         {"Boost Mixer", "Aux Volume", "Aux Input"},
 295
 296         {"ADC", NULL, "Boost Mixer"},
 297 };
 298
 299 static int wm8940_add_widgets(struct snd_soc_codec *codec)
 300 {
 301         struct snd_soc_dapm_context *dapm = &codec->dapm;
 302         int ret;
 303
 304         ret = snd_soc_dapm_new_controls(dapm, wm8940_dapm_widgets,
 305                                         ARRAY_SIZE(wm8940_dapm_widgets));
 306         if (ret)
 307                 goto error_ret;
 308         ret = snd_soc_dapm_add_routes(dapm, audio_map, ARRAY_SIZE(audio_map));
 309
 310 error_ret:
 311         return ret;
 312 }
 313
 314 #define wm8940_reset(c) snd_soc_write(c, WM8940_SOFTRESET, 0);
 315
 316 static int wm8940_set_dai_fmt(struct snd_soc_dai *codec_dai,
 317                               unsigned int fmt)
 318 {
 319         struct snd_soc_codec *codec = codec_dai->codec;
 320         u16 iface = snd_soc_read(codec, WM8940_IFACE) & 0xFE67;
 321         u16 clk = snd_soc_read(codec, WM8940_CLOCK) & 0x1fe;
 322
 323         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 324         case SND_SOC_DAIFMT_CBM_CFM:
 325                 clk |= 1;
 326                 break;
 327         case SND_SOC_DAIFMT_CBS_CFS:
 328                 break;
 329         default:
 330                 return -EINVAL;
 331         }
 332         snd_soc_write(codec, WM8940_CLOCK, clk);
 333
 334         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 335         case SND_SOC_DAIFMT_I2S:
 336                 iface |= (2 << 3);
 337                 break;
 338         case SND_SOC_DAIFMT_LEFT_J:
 339                 iface |= (1 << 3);
 340                 break;
 341         case SND_SOC_DAIFMT_RIGHT_J:
 342                 break;
 343         case SND_SOC_DAIFMT_DSP_A:
 344                 iface |= (3 << 3);
 345                 break;
 346         case SND_SOC_DAIFMT_DSP_B:
 347                 iface |= (3 << 3) | (1 << 7);
 348                 break;
 349         }
 350
 351         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 352         case SND_SOC_DAIFMT_NB_NF:
 353                 break;
 354         case SND_SOC_DAIFMT_NB_IF:
 355                 iface |= (1 << 7);
 356                 break;
 357         case SND_SOC_DAIFMT_IB_NF:
 358                 iface |= (1 << 8);
 359                 break;
 360         case SND_SOC_DAIFMT_IB_IF:
 361                 iface |= (1 << 8) | (1 << 7);
 362                 break;
 363         }
 364
 365         snd_soc_write(codec, WM8940_IFACE, iface);
 366
 367         return 0;
 368 }
 369
 370 static int wm8940_i2s_hw_params(struct snd_pcm_substream *substream,
 371                                 struct snd_pcm_hw_params *params,
 372                                 struct snd_soc_dai *dai)
 373 {
 374         struct snd_soc_codec *codec = dai->codec;
 375         u16 iface = snd_soc_read(codec, WM8940_IFACE) & 0xFD9F;
 376         u16 addcntrl = snd_soc_read(codec, WM8940_ADDCNTRL) & 0xFFF1;
 377         u16 companding =  snd_soc_read(codec,
 378                                                 WM8940_COMPANDINGCTL) & 0xFFDF;
 379         int ret;
 380
 381         /* LoutR control */
 382         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE
 383             && params_channels(params) == 2)
 384                 iface |= (1 << 9);
 385
 386         switch (params_rate(params)) {
 387         case 8000:
 388                 addcntrl |= (0x5 << 1);
 389                 break;
 390         case 11025:
 391                 addcntrl |= (0x4 << 1);
 392                 break;
 393         case 16000:
 394                 addcntrl |= (0x3 << 1);
 395                 break;
 396         case 22050:
 397                 addcntrl |= (0x2 << 1);
 398                 break;
 399         case 32000:
 400                 addcntrl |= (0x1 << 1);
 401                 break;
 402         case 44100:
 403         case 48000:
 404                 break;
 405         }
 406         ret = snd_soc_write(codec, WM8940_ADDCNTRL, addcntrl);
 407         if (ret)
 408                 goto error_ret;
 409
 410         switch (params_format(params)) {
 411         case SNDRV_PCM_FORMAT_S8:
 412                 companding = companding | (1 << 5);
 413                 break;
 414         case SNDRV_PCM_FORMAT_S16_LE:
 415                 break;
 416         case SNDRV_PCM_FORMAT_S20_3LE:
 417                 iface |= (1 << 5);
 418                 break;
 419         case SNDRV_PCM_FORMAT_S24_LE:
 420                 iface |= (2 << 5);
 421                 break;
 422         case SNDRV_PCM_FORMAT_S32_LE:
 423                 iface |= (3 << 5);
 424                 break;
 425         }
 426         ret = snd_soc_write(codec, WM8940_COMPANDINGCTL, companding);
 427         if (ret)
 428                 goto error_ret;
 429         ret = snd_soc_write(codec, WM8940_IFACE, iface);
 430
 431 error_ret:
 432         return ret;
 433 }
 434
 435 static int wm8940_mute(struct snd_soc_dai *dai, int mute)
 436 {
 437         struct snd_soc_codec *codec = dai->codec;
 438         u16 mute_reg = snd_soc_read(codec, WM8940_DAC) & 0xffbf;
 439
 440         if (mute)
 441                 mute_reg |= 0x40;
 442
 443         return snd_soc_write(codec, WM8940_DAC, mute_reg);
 444 }
 445
 446 static int wm8940_set_bias_level(struct snd_soc_codec *codec,
 447                                  enum snd_soc_bias_level level)
 448 {
 449         u16 val;
 450         u16 pwr_reg = snd_soc_read(codec, WM8940_POWER1) & 0x1F0;
 451         int ret = 0;
 452
 453         switch (level) {
 454         case SND_SOC_BIAS_ON:
 455                 /* ensure bufioen and biasen */
 456                 pwr_reg |= (1 << 2) | (1 << 3);
 457                 /* Enable thermal shutdown */
 458                 val = snd_soc_read(codec, WM8940_OUTPUTCTL);
 459                 ret = snd_soc_write(codec, WM8940_OUTPUTCTL, val | 0x2);
 460                 if (ret)
 461                         break;
 462                 /* set vmid to 75k */
 463                 ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg | 0x1);
 464                 break;
 465         case SND_SOC_BIAS_PREPARE:
 466                 /* ensure bufioen and biasen */
 467                 pwr_reg |= (1 << 2) | (1 << 3);
 468                 ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg | 0x1);
 469                 break;
 470         case SND_SOC_BIAS_STANDBY:
 471                 if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
 472                         ret = snd_soc_cache_sync(codec);
 473                         if (ret < 0) {
 474                                 dev_err(codec->dev, "Failed to sync cache: %d\n", ret);
 475                                 return ret;
 476                         }
 477                 }
 478
 479                 /* ensure bufioen and biasen */
 480                 pwr_reg |= (1 << 2) | (1 << 3);
 481                 /* set vmid to 300k for standby */
 482                 ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg | 0x2);
 483                 break;
 484         case SND_SOC_BIAS_OFF:
 485                 ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg);
 486                 break;
 487         }
 488
 489         codec->dapm.bias_level = level;
 490
 491         return ret;
 492 }
 493
 494 struct pll_ {
 495         unsigned int pre_scale:2;
 496         unsigned int n:4;
 497         unsigned int k;
 498 };
 499
 500 static struct pll_ pll_div;
 501
 502 /* The size in bits of the pll divide multiplied by 10
 503  * to allow rounding later */
 504 #define FIXED_PLL_SIZE ((1 << 24) * 10)
 505 static void pll_factors(unsigned int target, unsigned int source)
 506 {
 507         unsigned long long Kpart;
 508         unsigned int K, Ndiv, Nmod;
 509         /* The left shift ist to avoid accuracy loss when right shifting */
 510         Ndiv = target / source;
 511
 512         if (Ndiv > 12) {
 513                 source <<= 1;
 514                 /* Multiply by 2 */
 515                 pll_div.pre_scale = 0;
 516                 Ndiv = target / source;
 517         } else if (Ndiv < 3) {
 518                 source >>= 2;
 519                 /* Divide by 4 */
 520                 pll_div.pre_scale = 3;
 521                 Ndiv = target / source;
 522         } else if (Ndiv < 6) {
 523                 source >>= 1;
 524                 /* divide by 2 */
 525                 pll_div.pre_scale = 2;
 526                 Ndiv = target / source;
 527         } else
 528                 pll_div.pre_scale = 1;
 529
 530         if ((Ndiv < 6) || (Ndiv > 12))
 531                 printk(KERN_WARNING
 532                         "WM8940 N value %d outwith recommended range!d\n",
 533                         Ndiv);
 534
 535         pll_div.n = Ndiv;
 536         Nmod = target % source;
 537         Kpart = FIXED_PLL_SIZE * (long long)Nmod;
 538
 539         do_div(Kpart, source);
 540
 541         K = Kpart & 0xFFFFFFFF;
 542
 543         /* Check if we need to round */
 544         if ((K % 10) >= 5)
 545                 K += 5;
 546
 547         /* Move down to proper range now rounding is done */
 548         K /= 10;
 549
 550         pll_div.k = K;
 551 }
 552
 553 /* Untested at the moment */
 554 static int wm8940_set_dai_pll(struct snd_soc_dai *codec_dai, int pll_id,
 555                 int source, unsigned int freq_in, unsigned int freq_out)
 556 {
 557         struct snd_soc_codec *codec = codec_dai->codec;
 558         u16 reg;
 559
 560         /* Turn off PLL */
 561         reg = snd_soc_read(codec, WM8940_POWER1);
 562         snd_soc_write(codec, WM8940_POWER1, reg & 0x1df);
 563
 564         if (freq_in == 0 || freq_out == 0) {
 565                 /* Clock CODEC directly from MCLK */
 566                 reg = snd_soc_read(codec, WM8940_CLOCK);
 567                 snd_soc_write(codec, WM8940_CLOCK, reg & 0x0ff);
 568                 /* Pll power down */
 569                 snd_soc_write(codec, WM8940_PLLN, (1 << 7));
 570                 return 0;
 571         }
 572
 573         /* Pll is followed by a frequency divide by 4 */
 574         pll_factors(freq_out*4, freq_in);
 575         if (pll_div.k)
 576                 snd_soc_write(codec, WM8940_PLLN,
 577                              (pll_div.pre_scale << 4) | pll_div.n | (1 << 6));
 578         else /* No factional component */
 579                 snd_soc_write(codec, WM8940_PLLN,
 580                              (pll_div.pre_scale << 4) | pll_div.n);
 581         snd_soc_write(codec, WM8940_PLLK1, pll_div.k >> 18);
 582         snd_soc_write(codec, WM8940_PLLK2, (pll_div.k >> 9) & 0x1ff);
 583         snd_soc_write(codec, WM8940_PLLK3, pll_div.k & 0x1ff);
 584         /* Enable the PLL */
 585         reg = snd_soc_read(codec, WM8940_POWER1);
 586         snd_soc_write(codec, WM8940_POWER1, reg | 0x020);
 587
 588         /* Run CODEC from PLL instead of MCLK */
 589         reg = snd_soc_read(codec, WM8940_CLOCK);
 590         snd_soc_write(codec, WM8940_CLOCK, reg | 0x100);
 591
 592         return 0;
 593 }
 594
 595 static int wm8940_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 596                                  int clk_id, unsigned int freq, int dir)
 597 {
 598         struct snd_soc_codec *codec = codec_dai->codec;
 599         struct wm8940_priv *wm8940 = snd_soc_codec_get_drvdata(codec);
 600
 601         switch (freq) {
 602         case 11289600:
 603         case 12000000:
 604         case 12288000:
 605         case 16934400:
 606         case 18432000:
 607                 wm8940->sysclk = freq;
 608                 return 0;
 609         }
 610         return -EINVAL;
 611 }
 612
 613 static int wm8940_set_dai_clkdiv(struct snd_soc_dai *codec_dai,
 614                                  int div_id, int div)
 615 {
 616         struct snd_soc_codec *codec = codec_dai->codec;
 617         u16 reg;
 618         int ret = 0;
 619
 620         switch (div_id) {
 621         case WM8940_BCLKDIV:
 622                 reg = snd_soc_read(codec, WM8940_CLOCK) & 0xFFE3;
 623                 ret = snd_soc_write(codec, WM8940_CLOCK, reg | (div << 2));
 624                 break;
 625         case WM8940_MCLKDIV:
 626                 reg = snd_soc_read(codec, WM8940_CLOCK) & 0xFF1F;
 627                 ret = snd_soc_write(codec, WM8940_CLOCK, reg | (div << 5));
 628                 break;
 629         case WM8940_OPCLKDIV:
 630                 reg = snd_soc_read(codec, WM8940_GPIO) & 0xFFCF;
 631                 ret = snd_soc_write(codec, WM8940_GPIO, reg | (div << 4));
 632                 break;
 633         }
 634         return ret;
 635 }
 636
 637 #define WM8940_RATES SNDRV_PCM_RATE_8000_48000
 638
 639 #define WM8940_FORMATS (SNDRV_PCM_FMTBIT_S8 |                           \
 640                         SNDRV_PCM_FMTBIT_S16_LE |                       \
 641                         SNDRV_PCM_FMTBIT_S20_3LE |                      \
 642                         SNDRV_PCM_FMTBIT_S24_LE |                       \
 643                         SNDRV_PCM_FMTBIT_S32_LE)
 644
 645 static const struct snd_soc_dai_ops wm8940_dai_ops = {
 646         .hw_params = wm8940_i2s_hw_params,
 647         .set_sysclk = wm8940_set_dai_sysclk,
 648         .digital_mute = wm8940_mute,
 649         .set_fmt = wm8940_set_dai_fmt,
 650         .set_clkdiv = wm8940_set_dai_clkdiv,
 651         .set_pll = wm8940_set_dai_pll,
 652 };
 653
 654 static struct snd_soc_dai_driver wm8940_dai = {
 655         .name = "wm8940-hifi",
 656         .playback = {
 657                 .stream_name = "Playback",
 658                 .channels_min = 1,
 659                 .channels_max = 2,
 660                 .rates = WM8940_RATES,
 661                 .formats = WM8940_FORMATS,
 662         },
 663         .capture = {
 664                 .stream_name = "Capture",
 665                 .channels_min = 1,
 666                 .channels_max = 2,
 667                 .rates = WM8940_RATES,
 668                 .formats = WM8940_FORMATS,
 669         },
 670         .ops = &wm8940_dai_ops,
 671         .symmetric_rates = 1,
 672 };
 673
 674 static int wm8940_suspend(struct snd_soc_codec *codec)
 675 {
 676         return wm8940_set_bias_level(codec, SND_SOC_BIAS_OFF);
 677 }
 678
 679 static int wm8940_resume(struct snd_soc_codec *codec)
 680 {
 681         wm8940_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 682         return 0;
 683 }
 684
 685 static int wm8940_probe(struct snd_soc_codec *codec)
 686 {
 687         struct wm8940_priv *wm8940 = snd_soc_codec_get_drvdata(codec);
 688         struct wm8940_setup_data *pdata = codec->dev->platform_data;
 689         int ret;
 690         u16 reg;
 691
 692         ret = snd_soc_codec_set_cache_io(codec, 8, 16, wm8940->control_type);
 693         if (ret < 0) {
 694                 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
 695                 return ret;
 696         }
 697
 698         ret = wm8940_reset(codec);
 699         if (ret < 0) {
 700                 dev_err(codec->dev, "Failed to issue reset\n");
 701                 return ret;
 702         }
 703
 704         wm8940_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 705
 706         ret = snd_soc_write(codec, WM8940_POWER1, 0x180);
 707         if (ret < 0)
 708                 return ret;
 709
 710         if (!pdata)
 711                 dev_warn(codec->dev, "No platform data supplied\n");
 712         else {
 713                 reg = snd_soc_read(codec, WM8940_OUTPUTCTL);
 714                 ret = snd_soc_write(codec, WM8940_OUTPUTCTL, reg | pdata->vroi);
 715                 if (ret < 0)
 716                         return ret;
 717         }
 718
 719         ret = snd_soc_add_codec_controls(codec, wm8940_snd_controls,
 720                              ARRAY_SIZE(wm8940_snd_controls));
 721         if (ret)
 722                 return ret;
 723         ret = wm8940_add_widgets(codec);
 724         return ret;
 725 }
 726
 727 static int wm8940_remove(struct snd_soc_codec *codec)
 728 {
 729         wm8940_set_bias_level(codec, SND_SOC_BIAS_OFF);
 730         return 0;
 731 }
 732
 733 static struct snd_soc_codec_driver soc_codec_dev_wm8940 = {
 734         .probe =        wm8940_probe,
 735         .remove =       wm8940_remove,
 736         .suspend =      wm8940_suspend,
 737         .resume =       wm8940_resume,
 738         .set_bias_level = wm8940_set_bias_level,
 739         .reg_cache_size = ARRAY_SIZE(wm8940_reg_defaults),
 740         .reg_word_size = sizeof(u16),
 741         .reg_cache_default = wm8940_reg_defaults,
 742         .volatile_register = wm8940_volatile_register,
 743 };
 744
 745 static int wm8940_i2c_probe(struct i2c_client *i2c,
 746                             const struct i2c_device_id *id)
 747 {
 748         struct wm8940_priv *wm8940;
 749         int ret;
 750
 751         wm8940 = devm_kzalloc(&i2c->dev, sizeof(struct wm8940_priv),
 752                               GFP_KERNEL);
 753         if (wm8940 == NULL)
 754                 return -ENOMEM;
 755
 756         i2c_set_clientdata(i2c, wm8940);
 757         wm8940->control_type = SND_SOC_I2C;
 758
 759         ret = snd_soc_register_codec(&i2c->dev,
 760                         &soc_codec_dev_wm8940, &wm8940_dai, 1);
 761
 762         return ret;
 763 }
 764
 765 static int wm8940_i2c_remove(struct i2c_client *client)
 766 {
 767         snd_soc_unregister_codec(&client->dev);
 768
 769         return 0;
 770 }
 771
 772 static const struct i2c_device_id wm8940_i2c_id[] = {
 773         { "wm8940", 0 },
 774         { }
 775 };
 776 MODULE_DEVICE_TABLE(i2c, wm8940_i2c_id);
 777
 778 static struct i2c_driver wm8940_i2c_driver = {
 779         .driver = {
 780                 .name = "wm8940",
 781                 .owner = THIS_MODULE,
 782         },
 783         .probe =    wm8940_i2c_probe,
 784         .remove =   wm8940_i2c_remove,
 785         .id_table = wm8940_i2c_id,
 786 };
 787
 788 module_i2c_driver(wm8940_i2c_driver);
 789
 790 MODULE_DESCRIPTION("ASoC WM8940 driver");
 791 MODULE_AUTHOR("Jonathan Cameron");
 792 MODULE_LICENSE("GPL");