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/platform_device.h>
  32 #include <linux/spi/spi.h>
  33 #include <linux/slab.h>
  34 #include <sound/core.h>
  35 #include <sound/pcm.h>
  36 #include <sound/pcm_params.h>
  37 #include <sound/soc.h>
  38 #include <sound/initval.h>
  39 #include <sound/tlv.h>
  40
  41 #include "wm8940.h"
  42
  43 struct wm8940_priv {
  44         unsigned int sysclk;
  45         enum snd_soc_control_type control_type;
  46 };
  47
  48 static int wm8940_volatile_register(struct snd_soc_codec *codec,
  49                                     unsigned int reg)
  50 {
  51         switch (reg) {
  52         case WM8940_SOFTRESET:
  53                 return 1;
  54         default:
  55                 return 0;
  56         }
  57 }
  58
  59 static u16 wm8940_reg_defaults[] = {
  60         0x8940, /* Soft Reset */
  61         0x0000, /* Power 1 */
  62         0x0000, /* Power 2 */
  63         0x0000, /* Power 3 */
  64         0x0010, /* Interface Control */
  65         0x0000, /* Companding Control */
  66         0x0140, /* Clock Control */
  67         0x0000, /* Additional Controls */
  68         0x0000, /* GPIO Control */
  69         0x0002, /* Auto Increment Control */
  70         0x0000, /* DAC Control */
  71         0x00FF, /* DAC Volume */
  72         0,
  73         0,
  74         0x0100, /* ADC Control */
  75         0x00FF, /* ADC Volume */
  76         0x0000, /* Notch Filter 1 Control 1 */
  77         0x0000, /* Notch Filter 1 Control 2 */
  78         0x0000, /* Notch Filter 2 Control 1 */
  79         0x0000, /* Notch Filter 2 Control 2 */
  80         0x0000, /* Notch Filter 3 Control 1 */
  81         0x0000, /* Notch Filter 3 Control 2 */
  82         0x0000, /* Notch Filter 4 Control 1 */
  83         0x0000, /* Notch Filter 4 Control 2 */
  84         0x0032, /* DAC Limit Control 1 */
  85         0x0000, /* DAC Limit Control 2 */
  86         0,
  87         0,
  88         0,
  89         0,
  90         0,
  91         0,
  92         0x0038, /* ALC Control 1 */
  93         0x000B, /* ALC Control 2 */
  94         0x0032, /* ALC Control 3 */
  95         0x0000, /* Noise Gate */
  96         0x0041, /* PLLN */
  97         0x000C, /* PLLK1 */
  98         0x0093, /* PLLK2 */
  99         0x00E9, /* PLLK3 */
 100         0,
 101         0,
 102         0x0030, /* ALC Control 4 */
 103         0,
 104         0x0002, /* Input Control */
 105         0x0050, /* PGA Gain */
 106         0,
 107         0x0002, /* ADC Boost Control */
 108         0,
 109         0x0002, /* Output Control */
 110         0x0000, /* Speaker Mixer Control */
 111         0,
 112         0,
 113         0,
 114         0x0079, /* Speaker Volume */
 115         0,
 116         0x0000, /* Mono Mixer Control */
 117 };
 118
 119 static const char *wm8940_companding[] = { "Off", "NC", "u-law", "A-law" };
 120 static const struct soc_enum wm8940_adc_companding_enum
 121 = SOC_ENUM_SINGLE(WM8940_COMPANDINGCTL, 1, 4, wm8940_companding);
 122 static const struct soc_enum wm8940_dac_companding_enum
 123 = SOC_ENUM_SINGLE(WM8940_COMPANDINGCTL, 3, 4, wm8940_companding);
 124
 125 static const char *wm8940_alc_mode_text[] = {"ALC", "Limiter"};
 126 static const struct soc_enum wm8940_alc_mode_enum
 127 = SOC_ENUM_SINGLE(WM8940_ALC3, 8, 2, wm8940_alc_mode_text);
 128
 129 static const char *wm8940_mic_bias_level_text[] = {"0.9", "0.65"};
 130 static const struct soc_enum wm8940_mic_bias_level_enum
 131 = SOC_ENUM_SINGLE(WM8940_INPUTCTL, 8, 2, wm8940_mic_bias_level_text);
 132
 133 static const char *wm8940_filter_mode_text[] = {"Audio", "Application"};
 134 static const struct soc_enum wm8940_filter_mode_enum
 135 = SOC_ENUM_SINGLE(WM8940_ADC, 7, 2, wm8940_filter_mode_text);
 136
 137 static DECLARE_TLV_DB_SCALE(wm8940_spk_vol_tlv, -5700, 100, 1);
 138 static DECLARE_TLV_DB_SCALE(wm8940_att_tlv, -1000, 1000, 0);
 139 static DECLARE_TLV_DB_SCALE(wm8940_pga_vol_tlv, -1200, 75, 0);
 140 static DECLARE_TLV_DB_SCALE(wm8940_alc_min_tlv, -1200, 600, 0);
 141 static DECLARE_TLV_DB_SCALE(wm8940_alc_max_tlv, 675, 600, 0);
 142 static DECLARE_TLV_DB_SCALE(wm8940_alc_tar_tlv, -2250, 50, 0);
 143 static DECLARE_TLV_DB_SCALE(wm8940_lim_boost_tlv, 0, 100, 0);
 144 static DECLARE_TLV_DB_SCALE(wm8940_lim_thresh_tlv, -600, 100, 0);
 145 static DECLARE_TLV_DB_SCALE(wm8940_adc_tlv, -12750, 50, 1);
 146 static DECLARE_TLV_DB_SCALE(wm8940_capture_boost_vol_tlv, 0, 2000, 0);
 147
 148 static const struct snd_kcontrol_new wm8940_snd_controls[] = {
 149         SOC_SINGLE("Digital Loopback Switch", WM8940_COMPANDINGCTL,
 150                    6, 1, 0),
 151         SOC_ENUM("DAC Companding", wm8940_dac_companding_enum),
 152         SOC_ENUM("ADC Companding", wm8940_adc_companding_enum),
 153
 154         SOC_ENUM("ALC Mode", wm8940_alc_mode_enum),
 155         SOC_SINGLE("ALC Switch", WM8940_ALC1, 8, 1, 0),
 156         SOC_SINGLE_TLV("ALC Capture Max Gain", WM8940_ALC1,
 157                        3, 7, 1, wm8940_alc_max_tlv),
 158         SOC_SINGLE_TLV("ALC Capture Min Gain", WM8940_ALC1,
 159                        0, 7, 0, wm8940_alc_min_tlv),
 160         SOC_SINGLE_TLV("ALC Capture Target", WM8940_ALC2,
 161                        0, 14, 0, wm8940_alc_tar_tlv),
 162         SOC_SINGLE("ALC Capture Hold", WM8940_ALC2, 4, 10, 0),
 163         SOC_SINGLE("ALC Capture Decay", WM8940_ALC3, 4, 10, 0),
 164         SOC_SINGLE("ALC Capture Attach", WM8940_ALC3, 0, 10, 0),
 165         SOC_SINGLE("ALC ZC Switch", WM8940_ALC4, 1, 1, 0),
 166         SOC_SINGLE("ALC Capture Noise Gate Switch", WM8940_NOISEGATE,
 167                    3, 1, 0),
 168         SOC_SINGLE("ALC Capture Noise Gate Threshold", WM8940_NOISEGATE,
 169                    0, 7, 0),
 170
 171         SOC_SINGLE("DAC Playback Limiter Switch", WM8940_DACLIM1, 8, 1, 0),
 172         SOC_SINGLE("DAC Playback Limiter Attack", WM8940_DACLIM1, 0, 9, 0),
 173         SOC_SINGLE("DAC Playback Limiter Decay", WM8940_DACLIM1, 4, 11, 0),
 174         SOC_SINGLE_TLV("DAC Playback Limiter Threshold", WM8940_DACLIM2,
 175                        4, 9, 1, wm8940_lim_thresh_tlv),
 176         SOC_SINGLE_TLV("DAC Playback Limiter Boost", WM8940_DACLIM2,
 177                        0, 12, 0, wm8940_lim_boost_tlv),
 178
 179         SOC_SINGLE("Capture PGA ZC Switch", WM8940_PGAGAIN, 7, 1, 0),
 180         SOC_SINGLE_TLV("Capture PGA Volume", WM8940_PGAGAIN,
 181                        0, 63, 0, wm8940_pga_vol_tlv),
 182         SOC_SINGLE_TLV("Digital Playback Volume", WM8940_DACVOL,
 183                        0, 255, 0, wm8940_adc_tlv),
 184         SOC_SINGLE_TLV("Digital Capture Volume", WM8940_ADCVOL,
 185                        0, 255, 0, wm8940_adc_tlv),
 186         SOC_ENUM("Mic Bias Level", wm8940_mic_bias_level_enum),
 187         SOC_SINGLE_TLV("Capture Boost Volue", WM8940_ADCBOOST,
 188                        8, 1, 0, wm8940_capture_boost_vol_tlv),
 189         SOC_SINGLE_TLV("Speaker Playback Volume", WM8940_SPKVOL,
 190                        0, 63, 0, wm8940_spk_vol_tlv),
 191         SOC_SINGLE("Speaker Playback Switch", WM8940_SPKVOL,  6, 1, 1),
 192
 193         SOC_SINGLE_TLV("Speaker Mixer Line Bypass Volume", WM8940_SPKVOL,
 194                        8, 1, 1, wm8940_att_tlv),
 195         SOC_SINGLE("Speaker Playback ZC Switch", WM8940_SPKVOL, 7, 1, 0),
 196
 197         SOC_SINGLE("Mono Out Switch", WM8940_MONOMIX, 6, 1, 1),
 198         SOC_SINGLE_TLV("Mono Mixer Line Bypass Volume", WM8940_MONOMIX,
 199                        7, 1, 1, wm8940_att_tlv),
 200
 201         SOC_SINGLE("High Pass Filter Switch", WM8940_ADC, 8, 1, 0),
 202         SOC_ENUM("High Pass Filter Mode", wm8940_filter_mode_enum),
 203         SOC_SINGLE("High Pass Filter Cut Off", WM8940_ADC, 4, 7, 0),
 204         SOC_SINGLE("ADC Inversion Switch", WM8940_ADC, 0, 1, 0),
 205         SOC_SINGLE("DAC Inversion Switch", WM8940_DAC, 0, 1, 0),
 206         SOC_SINGLE("DAC Auto Mute Switch", WM8940_DAC, 2, 1, 0),
 207         SOC_SINGLE("ZC Timeout Clock Switch", WM8940_ADDCNTRL, 0, 1, 0),
 208 };
 209
 210 static const struct snd_kcontrol_new wm8940_speaker_mixer_controls[] = {
 211         SOC_DAPM_SINGLE("Line Bypass Switch", WM8940_SPKMIX, 1, 1, 0),
 212         SOC_DAPM_SINGLE("Aux Playback Switch", WM8940_SPKMIX, 5, 1, 0),
 213         SOC_DAPM_SINGLE("PCM Playback Switch", WM8940_SPKMIX, 0, 1, 0),
 214 };
 215
 216 static const struct snd_kcontrol_new wm8940_mono_mixer_controls[] = {
 217         SOC_DAPM_SINGLE("Line Bypass Switch", WM8940_MONOMIX, 1, 1, 0),
 218         SOC_DAPM_SINGLE("Aux Playback Switch", WM8940_MONOMIX, 2, 1, 0),
 219         SOC_DAPM_SINGLE("PCM Playback Switch", WM8940_MONOMIX, 0, 1, 0),
 220 };
 221
 222 static DECLARE_TLV_DB_SCALE(wm8940_boost_vol_tlv, -1500, 300, 1);
 223 static const struct snd_kcontrol_new wm8940_input_boost_controls[] = {
 224         SOC_DAPM_SINGLE("Mic PGA Switch", WM8940_PGAGAIN, 6, 1, 1),
 225         SOC_DAPM_SINGLE_TLV("Aux Volume", WM8940_ADCBOOST,
 226                             0, 7, 0, wm8940_boost_vol_tlv),
 227         SOC_DAPM_SINGLE_TLV("Mic Volume", WM8940_ADCBOOST,
 228                             4, 7, 0, wm8940_boost_vol_tlv),
 229 };
 230
 231 static const struct snd_kcontrol_new wm8940_micpga_controls[] = {
 232         SOC_DAPM_SINGLE("AUX Switch", WM8940_INPUTCTL, 2, 1, 0),
 233         SOC_DAPM_SINGLE("MICP Switch", WM8940_INPUTCTL, 0, 1, 0),
 234         SOC_DAPM_SINGLE("MICN Switch", WM8940_INPUTCTL, 1, 1, 0),
 235 };
 236
 237 static const struct snd_soc_dapm_widget wm8940_dapm_widgets[] = {
 238         SND_SOC_DAPM_MIXER("Speaker Mixer", WM8940_POWER3, 2, 0,
 239                            &wm8940_speaker_mixer_controls[0],
 240                            ARRAY_SIZE(wm8940_speaker_mixer_controls)),
 241         SND_SOC_DAPM_MIXER("Mono Mixer", WM8940_POWER3, 3, 0,
 242                            &wm8940_mono_mixer_controls[0],
 243                            ARRAY_SIZE(wm8940_mono_mixer_controls)),
 244         SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8940_POWER3, 0, 0),
 245
 246         SND_SOC_DAPM_PGA("SpkN Out", WM8940_POWER3, 5, 0, NULL, 0),
 247         SND_SOC_DAPM_PGA("SpkP Out", WM8940_POWER3, 6, 0, NULL, 0),
 248         SND_SOC_DAPM_PGA("Mono Out", WM8940_POWER3, 7, 0, NULL, 0),
 249         SND_SOC_DAPM_OUTPUT("MONOOUT"),
 250         SND_SOC_DAPM_OUTPUT("SPKOUTP"),
 251         SND_SOC_DAPM_OUTPUT("SPKOUTN"),
 252
 253         SND_SOC_DAPM_PGA("Aux Input", WM8940_POWER1, 6, 0, NULL, 0),
 254         SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8940_POWER2, 0, 0),
 255         SND_SOC_DAPM_MIXER("Mic PGA", WM8940_POWER2, 2, 0,
 256                            &wm8940_micpga_controls[0],
 257                            ARRAY_SIZE(wm8940_micpga_controls)),
 258         SND_SOC_DAPM_MIXER("Boost Mixer", WM8940_POWER2, 4, 0,
 259                            &wm8940_input_boost_controls[0],
 260                            ARRAY_SIZE(wm8940_input_boost_controls)),
 261         SND_SOC_DAPM_MICBIAS("Mic Bias", WM8940_POWER1, 4, 0),
 262
 263         SND_SOC_DAPM_INPUT("MICN"),
 264         SND_SOC_DAPM_INPUT("MICP"),
 265         SND_SOC_DAPM_INPUT("AUX"),
 266 };
 267
 268 static const struct snd_soc_dapm_route audio_map[] = {
 269         /* Mono output mixer */
 270         {"Mono Mixer", "PCM Playback Switch", "DAC"},
 271         {"Mono Mixer", "Aux Playback Switch", "Aux Input"},
 272         {"Mono Mixer", "Line Bypass Switch", "Boost Mixer"},
 273
 274         /* Speaker output mixer */
 275         {"Speaker Mixer", "PCM Playback Switch", "DAC"},
 276         {"Speaker Mixer", "Aux Playback Switch", "Aux Input"},
 277         {"Speaker Mixer", "Line Bypass Switch", "Boost Mixer"},
 278
 279         /* Outputs */
 280         {"Mono Out", NULL, "Mono Mixer"},
 281         {"MONOOUT", NULL, "Mono Out"},
 282         {"SpkN Out", NULL, "Speaker Mixer"},
 283         {"SpkP Out", NULL, "Speaker Mixer"},
 284         {"SPKOUTN", NULL, "SpkN Out"},
 285         {"SPKOUTP", NULL, "SpkP Out"},
 286
 287         /*  Microphone PGA */
 288         {"Mic PGA", "MICN Switch", "MICN"},
 289         {"Mic PGA", "MICP Switch", "MICP"},
 290         {"Mic PGA", "AUX Switch", "AUX"},
 291
 292         /* Boost Mixer */
 293         {"Boost Mixer", "Mic PGA Switch", "Mic PGA"},
 294         {"Boost Mixer", "Mic Volume",  "MICP"},
 295         {"Boost Mixer", "Aux Volume", "Aux Input"},
 296
 297         {"ADC", NULL, "Boost Mixer"},
 298 };
 299
 300 static int wm8940_add_widgets(struct snd_soc_codec *codec)
 301 {
 302         struct snd_soc_dapm_context *dapm = &codec->dapm;
 303         int ret;
 304
 305         ret = snd_soc_dapm_new_controls(dapm, wm8940_dapm_widgets,
 306                                         ARRAY_SIZE(wm8940_dapm_widgets));
 307         if (ret)
 308                 goto error_ret;
 309         ret = snd_soc_dapm_add_routes(dapm, audio_map, ARRAY_SIZE(audio_map));
 310
 311 error_ret:
 312         return ret;
 313 }
 314
 315 #define wm8940_reset(c) snd_soc_write(c, WM8940_SOFTRESET, 0);
 316
 317 static int wm8940_set_dai_fmt(struct snd_soc_dai *codec_dai,
 318                               unsigned int fmt)
 319 {
 320         struct snd_soc_codec *codec = codec_dai->codec;
 321         u16 iface = snd_soc_read(codec, WM8940_IFACE) & 0xFE67;
 322         u16 clk = snd_soc_read(codec, WM8940_CLOCK) & 0x1fe;
 323
 324         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 325         case SND_SOC_DAIFMT_CBM_CFM:
 326                 clk |= 1;
 327                 break;
 328         case SND_SOC_DAIFMT_CBS_CFS:
 329                 break;
 330         default:
 331                 return -EINVAL;
 332         }
 333         snd_soc_write(codec, WM8940_CLOCK, clk);
 334
 335         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 336         case SND_SOC_DAIFMT_I2S:
 337                 iface |= (2 << 3);
 338                 break;
 339         case SND_SOC_DAIFMT_LEFT_J:
 340                 iface |= (1 << 3);
 341                 break;
 342         case SND_SOC_DAIFMT_RIGHT_J:
 343                 break;
 344         case SND_SOC_DAIFMT_DSP_A:
 345                 iface |= (3 << 3);
 346                 break;
 347         case SND_SOC_DAIFMT_DSP_B:
 348                 iface |= (3 << 3) | (1 << 7);
 349                 break;
 350         }
 351
 352         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 353         case SND_SOC_DAIFMT_NB_NF:
 354                 break;
 355         case SND_SOC_DAIFMT_NB_IF:
 356                 iface |= (1 << 7);
 357                 break;
 358         case SND_SOC_DAIFMT_IB_NF:
 359                 iface |= (1 << 8);
 360                 break;
 361         case SND_SOC_DAIFMT_IB_IF:
 362                 iface |= (1 << 8) | (1 << 7);
 363                 break;
 364         }
 365
 366         snd_soc_write(codec, WM8940_IFACE, iface);
 367
 368         return 0;
 369 }
 370
 371 static int wm8940_i2s_hw_params(struct snd_pcm_substream *substream,
 372                                 struct snd_pcm_hw_params *params,
 373                                 struct snd_soc_dai *dai)
 374 {
 375         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 376         struct snd_soc_codec *codec = rtd->codec;
 377         u16 iface = snd_soc_read(codec, WM8940_IFACE) & 0xFD9F;
 378         u16 addcntrl = snd_soc_read(codec, WM8940_ADDCNTRL) & 0xFFF1;
 379         u16 companding =  snd_soc_read(codec,
 380                                                 WM8940_COMPANDINGCTL) & 0xFFDF;
 381         int ret;
 382
 383         /* LoutR control */
 384         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE
 385             && params_channels(params) == 2)
 386                 iface |= (1 << 9);
 387
 388         switch (params_rate(params)) {
 389         case 8000:
 390                 addcntrl |= (0x5 << 1);
 391                 break;
 392         case 11025:
 393                 addcntrl |= (0x4 << 1);
 394                 break;
 395         case 16000:
 396                 addcntrl |= (0x3 << 1);
 397                 break;
 398         case 22050:
 399                 addcntrl |= (0x2 << 1);
 400                 break;
 401         case 32000:
 402                 addcntrl |= (0x1 << 1);
 403                 break;
 404         case 44100:
 405         case 48000:
 406                 break;
 407         }
 408         ret = snd_soc_write(codec, WM8940_ADDCNTRL, addcntrl);
 409         if (ret)
 410                 goto error_ret;
 411
 412         switch (params_format(params)) {
 413         case SNDRV_PCM_FORMAT_S8:
 414                 companding = companding | (1 << 5);
 415                 break;
 416         case SNDRV_PCM_FORMAT_S16_LE:
 417                 break;
 418         case SNDRV_PCM_FORMAT_S20_3LE:
 419                 iface |= (1 << 5);
 420                 break;
 421         case SNDRV_PCM_FORMAT_S24_LE:
 422                 iface |= (2 << 5);
 423                 break;
 424         case SNDRV_PCM_FORMAT_S32_LE:
 425                 iface |= (3 << 5);
 426                 break;
 427         }
 428         ret = snd_soc_write(codec, WM8940_COMPANDINGCTL, companding);
 429         if (ret)
 430                 goto error_ret;
 431         ret = snd_soc_write(codec, WM8940_IFACE, iface);
 432
 433 error_ret:
 434         return ret;
 435 }
 436
 437 static int wm8940_mute(struct snd_soc_dai *dai, int mute)
 438 {
 439         struct snd_soc_codec *codec = dai->codec;
 440         u16 mute_reg = snd_soc_read(codec, WM8940_DAC) & 0xffbf;
 441
 442         if (mute)
 443                 mute_reg |= 0x40;
 444
 445         return snd_soc_write(codec, WM8940_DAC, mute_reg);
 446 }
 447
 448 static int wm8940_set_bias_level(struct snd_soc_codec *codec,
 449                                  enum snd_soc_bias_level level)
 450 {
 451         u16 val;
 452         u16 pwr_reg = snd_soc_read(codec, WM8940_POWER1) & 0x1F0;
 453         int ret = 0;
 454
 455         switch (level) {
 456         case SND_SOC_BIAS_ON:
 457                 /* ensure bufioen and biasen */
 458                 pwr_reg |= (1 << 2) | (1 << 3);
 459                 /* Enable thermal shutdown */
 460                 val = snd_soc_read(codec, WM8940_OUTPUTCTL);
 461                 ret = snd_soc_write(codec, WM8940_OUTPUTCTL, val | 0x2);
 462                 if (ret)
 463                         break;
 464                 /* set vmid to 75k */
 465                 ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg | 0x1);
 466                 break;
 467         case SND_SOC_BIAS_PREPARE:
 468                 /* ensure bufioen and biasen */
 469                 pwr_reg |= (1 << 2) | (1 << 3);
 470                 ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg | 0x1);
 471                 break;
 472         case SND_SOC_BIAS_STANDBY:
 473                 if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
 474                         ret = snd_soc_cache_sync(codec);
 475                         if (ret < 0) {
 476                                 dev_err(codec->dev, "Failed to sync cache: %d\n", ret);
 477                                 return ret;
 478                         }
 479                 }
 480
 481                 /* ensure bufioen and biasen */
 482                 pwr_reg |= (1 << 2) | (1 << 3);
 483                 /* set vmid to 300k for standby */
 484                 ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg | 0x2);
 485                 break;
 486         case SND_SOC_BIAS_OFF:
 487                 ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg);
 488                 break;
 489         }
 490
 491         codec->dapm.bias_level = level;
 492
 493         return ret;
 494 }
 495
 496 struct pll_ {
 497         unsigned int pre_scale:2;
 498         unsigned int n:4;
 499         unsigned int k;
 500 };
 501
 502 static struct pll_ pll_div;
 503
 504 /* The size in bits of the pll divide multiplied by 10
 505  * to allow rounding later */
 506 #define FIXED_PLL_SIZE ((1 << 24) * 10)
 507 static void pll_factors(unsigned int target, unsigned int source)
 508 {
 509         unsigned long long Kpart;
 510         unsigned int K, Ndiv, Nmod;
 511         /* The left shift ist to avoid accuracy loss when right shifting */
 512         Ndiv = target / source;
 513
 514         if (Ndiv > 12) {
 515                 source <<= 1;
 516                 /* Multiply by 2 */
 517                 pll_div.pre_scale = 0;
 518                 Ndiv = target / source;
 519         } else if (Ndiv < 3) {
 520                 source >>= 2;
 521                 /* Divide by 4 */
 522                 pll_div.pre_scale = 3;
 523                 Ndiv = target / source;
 524         } else if (Ndiv < 6) {
 525                 source >>= 1;
 526                 /* divide by 2 */
 527                 pll_div.pre_scale = 2;
 528                 Ndiv = target / source;
 529         } else
 530                 pll_div.pre_scale = 1;
 531
 532         if ((Ndiv < 6) || (Ndiv > 12))
 533                 printk(KERN_WARNING
 534                         "WM8940 N value %d outwith recommended range!d\n",
 535                         Ndiv);
 536
 537         pll_div.n = Ndiv;
 538         Nmod = target % source;
 539         Kpart = FIXED_PLL_SIZE * (long long)Nmod;
 540
 541         do_div(Kpart, source);
 542
 543         K = Kpart & 0xFFFFFFFF;
 544
 545         /* Check if we need to round */
 546         if ((K % 10) >= 5)
 547                 K += 5;
 548
 549         /* Move down to proper range now rounding is done */
 550         K /= 10;
 551
 552         pll_div.k = K;
 553 }
 554
 555 /* Untested at the moment */
 556 static int wm8940_set_dai_pll(struct snd_soc_dai *codec_dai, int pll_id,
 557                 int source, unsigned int freq_in, unsigned int freq_out)
 558 {
 559         struct snd_soc_codec *codec = codec_dai->codec;
 560         u16 reg;
 561
 562         /* Turn off PLL */
 563         reg = snd_soc_read(codec, WM8940_POWER1);
 564         snd_soc_write(codec, WM8940_POWER1, reg & 0x1df);
 565
 566         if (freq_in == 0 || freq_out == 0) {
 567                 /* Clock CODEC directly from MCLK */
 568                 reg = snd_soc_read(codec, WM8940_CLOCK);
 569                 snd_soc_write(codec, WM8940_CLOCK, reg & 0x0ff);
 570                 /* Pll power down */
 571                 snd_soc_write(codec, WM8940_PLLN, (1 << 7));
 572                 return 0;
 573         }
 574
 575         /* Pll is followed by a frequency divide by 4 */
 576         pll_factors(freq_out*4, freq_in);
 577         if (pll_div.k)
 578                 snd_soc_write(codec, WM8940_PLLN,
 579                              (pll_div.pre_scale << 4) | pll_div.n | (1 << 6));
 580         else /* No factional component */
 581                 snd_soc_write(codec, WM8940_PLLN,
 582                              (pll_div.pre_scale << 4) | pll_div.n);
 583         snd_soc_write(codec, WM8940_PLLK1, pll_div.k >> 18);
 584         snd_soc_write(codec, WM8940_PLLK2, (pll_div.k >> 9) & 0x1ff);
 585         snd_soc_write(codec, WM8940_PLLK3, pll_div.k & 0x1ff);
 586         /* Enable the PLL */
 587         reg = snd_soc_read(codec, WM8940_POWER1);
 588         snd_soc_write(codec, WM8940_POWER1, reg | 0x020);
 589
 590         /* Run CODEC from PLL instead of MCLK */
 591         reg = snd_soc_read(codec, WM8940_CLOCK);
 592         snd_soc_write(codec, WM8940_CLOCK, reg | 0x100);
 593
 594         return 0;
 595 }
 596
 597 static int wm8940_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 598                                  int clk_id, unsigned int freq, int dir)
 599 {
 600         struct snd_soc_codec *codec = codec_dai->codec;
 601         struct wm8940_priv *wm8940 = snd_soc_codec_get_drvdata(codec);
 602
 603         switch (freq) {
 604         case 11289600:
 605         case 12000000:
 606         case 12288000:
 607         case 16934400:
 608         case 18432000:
 609                 wm8940->sysclk = freq;
 610                 return 0;
 611         }
 612         return -EINVAL;
 613 }
 614
 615 static int wm8940_set_dai_clkdiv(struct snd_soc_dai *codec_dai,
 616                                  int div_id, int div)
 617 {
 618         struct snd_soc_codec *codec = codec_dai->codec;
 619         u16 reg;
 620         int ret = 0;
 621
 622         switch (div_id) {
 623         case WM8940_BCLKDIV:
 624                 reg = snd_soc_read(codec, WM8940_CLOCK) & 0xFFE3;
 625                 ret = snd_soc_write(codec, WM8940_CLOCK, reg | (div << 2));
 626                 break;
 627         case WM8940_MCLKDIV:
 628                 reg = snd_soc_read(codec, WM8940_CLOCK) & 0xFF1F;
 629                 ret = snd_soc_write(codec, WM8940_CLOCK, reg | (div << 5));
 630                 break;
 631         case WM8940_OPCLKDIV:
 632                 reg = snd_soc_read(codec, WM8940_ADDCNTRL) & 0xFFCF;
 633                 ret = snd_soc_write(codec, WM8940_ADDCNTRL, reg | (div << 4));
 634                 break;
 635         }
 636         return ret;
 637 }
 638
 639 #define WM8940_RATES SNDRV_PCM_RATE_8000_48000
 640
 641 #define WM8940_FORMATS (SNDRV_PCM_FMTBIT_S8 |                           \
 642                         SNDRV_PCM_FMTBIT_S16_LE |                       \
 643                         SNDRV_PCM_FMTBIT_S20_3LE |                      \
 644                         SNDRV_PCM_FMTBIT_S24_LE |                       \
 645                         SNDRV_PCM_FMTBIT_S32_LE)
 646
 647 static struct snd_soc_dai_ops wm8940_dai_ops = {
 648         .hw_params = wm8940_i2s_hw_params,
 649         .set_sysclk = wm8940_set_dai_sysclk,
 650         .digital_mute = wm8940_mute,
 651         .set_fmt = wm8940_set_dai_fmt,
 652         .set_clkdiv = wm8940_set_dai_clkdiv,
 653         .set_pll = wm8940_set_dai_pll,
 654 };
 655
 656 static struct snd_soc_dai_driver wm8940_dai = {
 657         .name = "wm8940-hifi",
 658         .playback = {
 659                 .stream_name = "Playback",
 660                 .channels_min = 1,
 661                 .channels_max = 2,
 662                 .rates = WM8940_RATES,
 663                 .formats = WM8940_FORMATS,
 664         },
 665         .capture = {
 666                 .stream_name = "Capture",
 667                 .channels_min = 1,
 668                 .channels_max = 2,
 669                 .rates = WM8940_RATES,
 670                 .formats = WM8940_FORMATS,
 671         },
 672         .ops = &wm8940_dai_ops,
 673         .symmetric_rates = 1,
 674 };
 675
 676 static int wm8940_suspend(struct snd_soc_codec *codec, pm_message_t state)
 677 {
 678         return wm8940_set_bias_level(codec, SND_SOC_BIAS_OFF);
 679 }
 680
 681 static int wm8940_resume(struct snd_soc_codec *codec)
 682 {
 683         wm8940_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 684         return 0;
 685 }
 686
 687 static int wm8940_probe(struct snd_soc_codec *codec)
 688 {
 689         struct wm8940_priv *wm8940 = snd_soc_codec_get_drvdata(codec);
 690         struct wm8940_setup_data *pdata = codec->dev->platform_data;
 691         int ret;
 692         u16 reg;
 693
 694         ret = snd_soc_codec_set_cache_io(codec, 8, 16, wm8940->control_type);
 695         if (ret < 0) {
 696                 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
 697                 return ret;
 698         }
 699
 700         ret = wm8940_reset(codec);
 701         if (ret < 0) {
 702                 dev_err(codec->dev, "Failed to issue reset\n");
 703                 return ret;
 704         }
 705
 706         wm8940_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 707
 708         ret = snd_soc_write(codec, WM8940_POWER1, 0x180);
 709         if (ret < 0)
 710                 return ret;
 711
 712         if (!pdata)
 713                 dev_warn(codec->dev, "No platform data supplied\n");
 714         else {
 715                 reg = snd_soc_read(codec, WM8940_OUTPUTCTL);
 716                 ret = snd_soc_write(codec, WM8940_OUTPUTCTL, reg | pdata->vroi);
 717                 if (ret < 0)
 718                         return ret;
 719         }
 720
 721         ret = snd_soc_add_controls(codec, wm8940_snd_controls,
 722                              ARRAY_SIZE(wm8940_snd_controls));
 723         if (ret)
 724                 return ret;
 725         ret = wm8940_add_widgets(codec);
 726         return ret;
 727 }
 728
 729 static int wm8940_remove(struct snd_soc_codec *codec)
 730 {
 731         wm8940_set_bias_level(codec, SND_SOC_BIAS_OFF);
 732         return 0;
 733 }
 734
 735 static struct snd_soc_codec_driver soc_codec_dev_wm8940 = {
 736         .probe =        wm8940_probe,
 737         .remove =       wm8940_remove,
 738         .suspend =      wm8940_suspend,
 739         .resume =       wm8940_resume,
 740         .set_bias_level = wm8940_set_bias_level,
 741         .reg_cache_size = ARRAY_SIZE(wm8940_reg_defaults),
 742         .reg_word_size = sizeof(u16),
 743         .reg_cache_default = wm8940_reg_defaults,
 744         .volatile_register = wm8940_volatile_register,
 745 };
 746
 747 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 748 static __devinit int wm8940_i2c_probe(struct i2c_client *i2c,
 749                                       const struct i2c_device_id *id)
 750 {
 751         struct wm8940_priv *wm8940;
 752         int ret;
 753
 754         wm8940 = kzalloc(sizeof(struct wm8940_priv), GFP_KERNEL);
 755         if (wm8940 == NULL)
 756                 return -ENOMEM;
 757
 758         i2c_set_clientdata(i2c, wm8940);
 759         wm8940->control_type = SND_SOC_I2C;
 760
 761         ret = snd_soc_register_codec(&i2c->dev,
 762                         &soc_codec_dev_wm8940, &wm8940_dai, 1);
 763         if (ret < 0)
 764                 kfree(wm8940);
 765         return ret;
 766 }
 767
 768 static __devexit int wm8940_i2c_remove(struct i2c_client *client)
 769 {
 770         snd_soc_unregister_codec(&client->dev);
 771         kfree(i2c_get_clientdata(client));
 772         return 0;
 773 }
 774
 775 static const struct i2c_device_id wm8940_i2c_id[] = {
 776         { "wm8940", 0 },
 777         { }
 778 };
 779 MODULE_DEVICE_TABLE(i2c, wm8940_i2c_id);
 780
 781 static struct i2c_driver wm8940_i2c_driver = {
 782         .driver = {
 783                 .name = "wm8940-codec",
 784                 .owner = THIS_MODULE,
 785         },
 786         .probe =    wm8940_i2c_probe,
 787         .remove =   __devexit_p(wm8940_i2c_remove),
 788         .id_table = wm8940_i2c_id,
 789 };
 790 #endif
 791
 792 static int __init wm8940_modinit(void)
 793 {
 794         int ret = 0;
 795 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 796         ret = i2c_add_driver(&wm8940_i2c_driver);
 797         if (ret != 0) {
 798                 printk(KERN_ERR "Failed to register wm8940 I2C driver: %d\n",
 799                        ret);
 800         }
 801 #endif
 802         return ret;
 803 }
 804 module_init(wm8940_modinit);
 805
 806 static void __exit wm8940_exit(void)
 807 {
 808 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 809         i2c_del_driver(&wm8940_i2c_driver);
 810 #endif
 811 }
 812 module_exit(wm8940_exit);
 813
 814 MODULE_DESCRIPTION("ASoC WM8940 driver");
 815 MODULE_AUTHOR("Jonathan Cameron");
 816 MODULE_LICENSE("GPL");