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 <sound/core.h>
  34 #include <sound/pcm.h>
  35 #include <sound/pcm_params.h>
  36 #include <sound/soc.h>
  37 #include <sound/soc-dapm.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         u16 reg_cache[WM8940_CACHEREGNUM];
  46         struct snd_soc_codec codec;
  47 };
  48
  49 static u16 wm8940_reg_defaults[] = {
  50         0x8940, /* Soft Reset */
  51         0x0000, /* Power 1 */
  52         0x0000, /* Power 2 */
  53         0x0000, /* Power 3 */
  54         0x0010, /* Interface Control */
  55         0x0000, /* Companding Control */
  56         0x0140, /* Clock Control */
  57         0x0000, /* Additional Controls */
  58         0x0000, /* GPIO Control */
  59         0x0002, /* Auto Increment Control */
  60         0x0000, /* DAC Control */
  61         0x00FF, /* DAC Volume */
  62         0,
  63         0,
  64         0x0100, /* ADC Control */
  65         0x00FF, /* ADC Volume */
  66         0x0000, /* Notch Filter 1 Control 1 */
  67         0x0000, /* Notch Filter 1 Control 2 */
  68         0x0000, /* Notch Filter 2 Control 1 */
  69         0x0000, /* Notch Filter 2 Control 2 */
  70         0x0000, /* Notch Filter 3 Control 1 */
  71         0x0000, /* Notch Filter 3 Control 2 */
  72         0x0000, /* Notch Filter 4 Control 1 */
  73         0x0000, /* Notch Filter 4 Control 2 */
  74         0x0032, /* DAC Limit Control 1 */
  75         0x0000, /* DAC Limit Control 2 */
  76         0,
  77         0,
  78         0,
  79         0,
  80         0,
  81         0,
  82         0x0038, /* ALC Control 1 */
  83         0x000B, /* ALC Control 2 */
  84         0x0032, /* ALC Control 3 */
  85         0x0000, /* Noise Gate */
  86         0x0041, /* PLLN */
  87         0x000C, /* PLLK1 */
  88         0x0093, /* PLLK2 */
  89         0x00E9, /* PLLK3 */
  90         0,
  91         0,
  92         0x0030, /* ALC Control 4 */
  93         0,
  94         0x0002, /* Input Control */
  95         0x0050, /* PGA Gain */
  96         0,
  97         0x0002, /* ADC Boost Control */
  98         0,
  99         0x0002, /* Output Control */
 100         0x0000, /* Speaker Mixer Control */
 101         0,
 102         0,
 103         0,
 104         0x0079, /* Speaker Volume */
 105         0,
 106         0x0000, /* Mono Mixer Control */
 107 };
 108
 109 static const char *wm8940_companding[] = { "Off", "NC", "u-law", "A-law" };
 110 static const struct soc_enum wm8940_adc_companding_enum
 111 = SOC_ENUM_SINGLE(WM8940_COMPANDINGCTL, 1, 4, wm8940_companding);
 112 static const struct soc_enum wm8940_dac_companding_enum
 113 = SOC_ENUM_SINGLE(WM8940_COMPANDINGCTL, 3, 4, wm8940_companding);
 114
 115 static const char *wm8940_alc_mode_text[] = {"ALC", "Limiter"};
 116 static const struct soc_enum wm8940_alc_mode_enum
 117 = SOC_ENUM_SINGLE(WM8940_ALC3, 8, 2, wm8940_alc_mode_text);
 118
 119 static const char *wm8940_mic_bias_level_text[] = {"0.9", "0.65"};
 120 static const struct soc_enum wm8940_mic_bias_level_enum
 121 = SOC_ENUM_SINGLE(WM8940_INPUTCTL, 8, 2, wm8940_mic_bias_level_text);
 122
 123 static const char *wm8940_filter_mode_text[] = {"Audio", "Application"};
 124 static const struct soc_enum wm8940_filter_mode_enum
 125 = SOC_ENUM_SINGLE(WM8940_ADC, 7, 2, wm8940_filter_mode_text);
 126
 127 static DECLARE_TLV_DB_SCALE(wm8940_spk_vol_tlv, -5700, 100, 1);
 128 static DECLARE_TLV_DB_SCALE(wm8940_att_tlv, -1000, 1000, 0);
 129 static DECLARE_TLV_DB_SCALE(wm8940_pga_vol_tlv, -1200, 75, 0);
 130 static DECLARE_TLV_DB_SCALE(wm8940_alc_min_tlv, -1200, 600, 0);
 131 static DECLARE_TLV_DB_SCALE(wm8940_alc_max_tlv, 675, 600, 0);
 132 static DECLARE_TLV_DB_SCALE(wm8940_alc_tar_tlv, -2250, 50, 0);
 133 static DECLARE_TLV_DB_SCALE(wm8940_lim_boost_tlv, 0, 100, 0);
 134 static DECLARE_TLV_DB_SCALE(wm8940_lim_thresh_tlv, -600, 100, 0);
 135 static DECLARE_TLV_DB_SCALE(wm8940_adc_tlv, -12750, 50, 1);
 136 static DECLARE_TLV_DB_SCALE(wm8940_capture_boost_vol_tlv, 0, 2000, 0);
 137
 138 static const struct snd_kcontrol_new wm8940_snd_controls[] = {
 139         SOC_SINGLE("Digital Loopback Switch", WM8940_COMPANDINGCTL,
 140                    6, 1, 0),
 141         SOC_ENUM("DAC Companding", wm8940_dac_companding_enum),
 142         SOC_ENUM("ADC Companding", wm8940_adc_companding_enum),
 143
 144         SOC_ENUM("ALC Mode", wm8940_alc_mode_enum),
 145         SOC_SINGLE("ALC Switch", WM8940_ALC1, 8, 1, 0),
 146         SOC_SINGLE_TLV("ALC Capture Max Gain", WM8940_ALC1,
 147                        3, 7, 1, wm8940_alc_max_tlv),
 148         SOC_SINGLE_TLV("ALC Capture Min Gain", WM8940_ALC1,
 149                        0, 7, 0, wm8940_alc_min_tlv),
 150         SOC_SINGLE_TLV("ALC Capture Target", WM8940_ALC2,
 151                        0, 14, 0, wm8940_alc_tar_tlv),
 152         SOC_SINGLE("ALC Capture Hold", WM8940_ALC2, 4, 10, 0),
 153         SOC_SINGLE("ALC Capture Decay", WM8940_ALC3, 4, 10, 0),
 154         SOC_SINGLE("ALC Capture Attach", WM8940_ALC3, 0, 10, 0),
 155         SOC_SINGLE("ALC ZC Switch", WM8940_ALC4, 1, 1, 0),
 156         SOC_SINGLE("ALC Capture Noise Gate Switch", WM8940_NOISEGATE,
 157                    3, 1, 0),
 158         SOC_SINGLE("ALC Capture Noise Gate Threshold", WM8940_NOISEGATE,
 159                    0, 7, 0),
 160
 161         SOC_SINGLE("DAC Playback Limiter Switch", WM8940_DACLIM1, 8, 1, 0),
 162         SOC_SINGLE("DAC Playback Limiter Attack", WM8940_DACLIM1, 0, 9, 0),
 163         SOC_SINGLE("DAC Playback Limiter Decay", WM8940_DACLIM1, 4, 11, 0),
 164         SOC_SINGLE_TLV("DAC Playback Limiter Threshold", WM8940_DACLIM2,
 165                        4, 9, 1, wm8940_lim_thresh_tlv),
 166         SOC_SINGLE_TLV("DAC Playback Limiter Boost", WM8940_DACLIM2,
 167                        0, 12, 0, wm8940_lim_boost_tlv),
 168
 169         SOC_SINGLE("Capture PGA ZC Switch", WM8940_PGAGAIN, 7, 1, 0),
 170         SOC_SINGLE_TLV("Capture PGA Volume", WM8940_PGAGAIN,
 171                        0, 63, 0, wm8940_pga_vol_tlv),
 172         SOC_SINGLE_TLV("Digital Playback Volume", WM8940_DACVOL,
 173                        0, 255, 0, wm8940_adc_tlv),
 174         SOC_SINGLE_TLV("Digital Capture Volume", WM8940_ADCVOL,
 175                        0, 255, 0, wm8940_adc_tlv),
 176         SOC_ENUM("Mic Bias Level", wm8940_mic_bias_level_enum),
 177         SOC_SINGLE_TLV("Capture Boost Volue", WM8940_ADCBOOST,
 178                        8, 1, 0, wm8940_capture_boost_vol_tlv),
 179         SOC_SINGLE_TLV("Speaker Playback Volume", WM8940_SPKVOL,
 180                        0, 63, 0, wm8940_spk_vol_tlv),
 181         SOC_SINGLE("Speaker Playback Switch", WM8940_SPKVOL,  6, 1, 1),
 182
 183         SOC_SINGLE_TLV("Speaker Mixer Line Bypass Volume", WM8940_SPKVOL,
 184                        8, 1, 1, wm8940_att_tlv),
 185         SOC_SINGLE("Speaker Playback ZC Switch", WM8940_SPKVOL, 7, 1, 0),
 186
 187         SOC_SINGLE("Mono Out Switch", WM8940_MONOMIX, 6, 1, 1),
 188         SOC_SINGLE_TLV("Mono Mixer Line Bypass Volume", WM8940_MONOMIX,
 189                        7, 1, 1, wm8940_att_tlv),
 190
 191         SOC_SINGLE("High Pass Filter Switch", WM8940_ADC, 8, 1, 0),
 192         SOC_ENUM("High Pass Filter Mode", wm8940_filter_mode_enum),
 193         SOC_SINGLE("High Pass Filter Cut Off", WM8940_ADC, 4, 7, 0),
 194         SOC_SINGLE("ADC Inversion Switch", WM8940_ADC, 0, 1, 0),
 195         SOC_SINGLE("DAC Inversion Switch", WM8940_DAC, 0, 1, 0),
 196         SOC_SINGLE("DAC Auto Mute Switch", WM8940_DAC, 2, 1, 0),
 197         SOC_SINGLE("ZC Timeout Clock Switch", WM8940_ADDCNTRL, 0, 1, 0),
 198 };
 199
 200 static const struct snd_kcontrol_new wm8940_speaker_mixer_controls[] = {
 201         SOC_DAPM_SINGLE("Line Bypass Switch", WM8940_SPKMIX, 1, 1, 0),
 202         SOC_DAPM_SINGLE("Aux Playback Switch", WM8940_SPKMIX, 5, 1, 0),
 203         SOC_DAPM_SINGLE("PCM Playback Switch", WM8940_SPKMIX, 0, 1, 0),
 204 };
 205
 206 static const struct snd_kcontrol_new wm8940_mono_mixer_controls[] = {
 207         SOC_DAPM_SINGLE("Line Bypass Switch", WM8940_MONOMIX, 1, 1, 0),
 208         SOC_DAPM_SINGLE("Aux Playback Switch", WM8940_MONOMIX, 2, 1, 0),
 209         SOC_DAPM_SINGLE("PCM Playback Switch", WM8940_MONOMIX, 0, 1, 0),
 210 };
 211
 212 static DECLARE_TLV_DB_SCALE(wm8940_boost_vol_tlv, -1500, 300, 1);
 213 static const struct snd_kcontrol_new wm8940_input_boost_controls[] = {
 214         SOC_DAPM_SINGLE("Mic PGA Switch", WM8940_PGAGAIN, 6, 1, 1),
 215         SOC_DAPM_SINGLE_TLV("Aux Volume", WM8940_ADCBOOST,
 216                             0, 7, 0, wm8940_boost_vol_tlv),
 217         SOC_DAPM_SINGLE_TLV("Mic Volume", WM8940_ADCBOOST,
 218                             4, 7, 0, wm8940_boost_vol_tlv),
 219 };
 220
 221 static const struct snd_kcontrol_new wm8940_micpga_controls[] = {
 222         SOC_DAPM_SINGLE("AUX Switch", WM8940_INPUTCTL, 2, 1, 0),
 223         SOC_DAPM_SINGLE("MICP Switch", WM8940_INPUTCTL, 0, 1, 0),
 224         SOC_DAPM_SINGLE("MICN Switch", WM8940_INPUTCTL, 1, 1, 0),
 225 };
 226
 227 static const struct snd_soc_dapm_widget wm8940_dapm_widgets[] = {
 228         SND_SOC_DAPM_MIXER("Speaker Mixer", WM8940_POWER3, 2, 0,
 229                            &wm8940_speaker_mixer_controls[0],
 230                            ARRAY_SIZE(wm8940_speaker_mixer_controls)),
 231         SND_SOC_DAPM_MIXER("Mono Mixer", WM8940_POWER3, 3, 0,
 232                            &wm8940_mono_mixer_controls[0],
 233                            ARRAY_SIZE(wm8940_mono_mixer_controls)),
 234         SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8940_POWER3, 0, 0),
 235
 236         SND_SOC_DAPM_PGA("SpkN Out", WM8940_POWER3, 5, 0, NULL, 0),
 237         SND_SOC_DAPM_PGA("SpkP Out", WM8940_POWER3, 6, 0, NULL, 0),
 238         SND_SOC_DAPM_PGA("Mono Out", WM8940_POWER3, 7, 0, NULL, 0),
 239         SND_SOC_DAPM_OUTPUT("MONOOUT"),
 240         SND_SOC_DAPM_OUTPUT("SPKOUTP"),
 241         SND_SOC_DAPM_OUTPUT("SPKOUTN"),
 242
 243         SND_SOC_DAPM_PGA("Aux Input", WM8940_POWER1, 6, 0, NULL, 0),
 244         SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8940_POWER2, 0, 0),
 245         SND_SOC_DAPM_MIXER("Mic PGA", WM8940_POWER2, 2, 0,
 246                            &wm8940_micpga_controls[0],
 247                            ARRAY_SIZE(wm8940_micpga_controls)),
 248         SND_SOC_DAPM_MIXER("Boost Mixer", WM8940_POWER2, 4, 0,
 249                            &wm8940_input_boost_controls[0],
 250                            ARRAY_SIZE(wm8940_input_boost_controls)),
 251         SND_SOC_DAPM_MICBIAS("Mic Bias", WM8940_POWER1, 4, 0),
 252
 253         SND_SOC_DAPM_INPUT("MICN"),
 254         SND_SOC_DAPM_INPUT("MICP"),
 255         SND_SOC_DAPM_INPUT("AUX"),
 256 };
 257
 258 static const struct snd_soc_dapm_route audio_map[] = {
 259         /* Mono output mixer */
 260         {"Mono Mixer", "PCM Playback Switch", "DAC"},
 261         {"Mono Mixer", "Aux Playback Switch", "Aux Input"},
 262         {"Mono Mixer", "Line Bypass Switch", "Boost Mixer"},
 263
 264         /* Speaker output mixer */
 265         {"Speaker Mixer", "PCM Playback Switch", "DAC"},
 266         {"Speaker Mixer", "Aux Playback Switch", "Aux Input"},
 267         {"Speaker Mixer", "Line Bypass Switch", "Boost Mixer"},
 268
 269         /* Outputs */
 270         {"Mono Out", NULL, "Mono Mixer"},
 271         {"MONOOUT", NULL, "Mono Out"},
 272         {"SpkN Out", NULL, "Speaker Mixer"},
 273         {"SpkP Out", NULL, "Speaker Mixer"},
 274         {"SPKOUTN", NULL, "SpkN Out"},
 275         {"SPKOUTP", NULL, "SpkP Out"},
 276
 277         /*  Microphone PGA */
 278         {"Mic PGA", "MICN Switch", "MICN"},
 279         {"Mic PGA", "MICP Switch", "MICP"},
 280         {"Mic PGA", "AUX Switch", "AUX"},
 281
 282         /* Boost Mixer */
 283         {"Boost Mixer", "Mic PGA Switch", "Mic PGA"},
 284         {"Boost Mixer", "Mic Volume",  "MICP"},
 285         {"Boost Mixer", "Aux Volume", "Aux Input"},
 286
 287         {"ADC", NULL, "Boost Mixer"},
 288 };
 289
 290 static int wm8940_add_widgets(struct snd_soc_codec *codec)
 291 {
 292         int ret;
 293
 294         ret = snd_soc_dapm_new_controls(codec, wm8940_dapm_widgets,
 295                                         ARRAY_SIZE(wm8940_dapm_widgets));
 296         if (ret)
 297                 goto error_ret;
 298         ret = snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));
 299         if (ret)
 300                 goto error_ret;
 301         ret = snd_soc_dapm_new_widgets(codec);
 302
 303 error_ret:
 304         return ret;
 305 }
 306
 307 #define wm8940_reset(c) snd_soc_write(c, WM8940_SOFTRESET, 0);
 308
 309 static int wm8940_set_dai_fmt(struct snd_soc_dai *codec_dai,
 310                               unsigned int fmt)
 311 {
 312         struct snd_soc_codec *codec = codec_dai->codec;
 313         u16 iface = snd_soc_read(codec, WM8940_IFACE) & 0xFE67;
 314         u16 clk = snd_soc_read(codec, WM8940_CLOCK) & 0x1fe;
 315
 316         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 317         case SND_SOC_DAIFMT_CBM_CFM:
 318                 clk |= 1;
 319                 break;
 320         case SND_SOC_DAIFMT_CBS_CFS:
 321                 break;
 322         default:
 323                 return -EINVAL;
 324         }
 325         snd_soc_write(codec, WM8940_CLOCK, clk);
 326
 327         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 328         case SND_SOC_DAIFMT_I2S:
 329                 iface |= (2 << 3);
 330                 break;
 331         case SND_SOC_DAIFMT_LEFT_J:
 332                 iface |= (1 << 3);
 333                 break;
 334         case SND_SOC_DAIFMT_RIGHT_J:
 335                 break;
 336         case SND_SOC_DAIFMT_DSP_A:
 337                 iface |= (3 << 3);
 338                 break;
 339         case SND_SOC_DAIFMT_DSP_B:
 340                 iface |= (3 << 3) | (1 << 7);
 341                 break;
 342         }
 343
 344         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 345         case SND_SOC_DAIFMT_NB_NF:
 346                 break;
 347         case SND_SOC_DAIFMT_NB_IF:
 348                 iface |= (1 << 7);
 349                 break;
 350         case SND_SOC_DAIFMT_IB_NF:
 351                 iface |= (1 << 8);
 352                 break;
 353         case SND_SOC_DAIFMT_IB_IF:
 354                 iface |= (1 << 8) | (1 << 7);
 355                 break;
 356         }
 357
 358         snd_soc_write(codec, WM8940_IFACE, iface);
 359
 360         return 0;
 361 }
 362
 363 static int wm8940_i2s_hw_params(struct snd_pcm_substream *substream,
 364                                 struct snd_pcm_hw_params *params,
 365                                 struct snd_soc_dai *dai)
 366 {
 367         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 368         struct snd_soc_device *socdev = rtd->socdev;
 369         struct snd_soc_codec *codec = socdev->card->codec;
 370         u16 iface = snd_soc_read(codec, WM8940_IFACE) & 0xFD9F;
 371         u16 addcntrl = snd_soc_read(codec, WM8940_ADDCNTRL) & 0xFFF1;
 372         u16 companding =  snd_soc_read(codec,
 373                                                 WM8940_COMPANDINGCTL) & 0xFFDF;
 374         int ret;
 375
 376         /* LoutR control */
 377         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE
 378             && params_channels(params) == 2)
 379                 iface |= (1 << 9);
 380
 381         switch (params_rate(params)) {
 382         case SNDRV_PCM_RATE_8000:
 383                 addcntrl |= (0x5 << 1);
 384                 break;
 385         case SNDRV_PCM_RATE_11025:
 386                 addcntrl |= (0x4 << 1);
 387                 break;
 388         case SNDRV_PCM_RATE_16000:
 389                 addcntrl |= (0x3 << 1);
 390                 break;
 391         case SNDRV_PCM_RATE_22050:
 392                 addcntrl |= (0x2 << 1);
 393                 break;
 394         case SNDRV_PCM_RATE_32000:
 395                 addcntrl |= (0x1 << 1);
 396                 break;
 397         case SNDRV_PCM_RATE_44100:
 398         case SNDRV_PCM_RATE_48000:
 399                 break;
 400         }
 401         ret = snd_soc_write(codec, WM8940_ADDCNTRL, addcntrl);
 402         if (ret)
 403                 goto error_ret;
 404
 405         switch (params_format(params)) {
 406         case SNDRV_PCM_FORMAT_S8:
 407                 companding = companding | (1 << 5);
 408                 break;
 409         case SNDRV_PCM_FORMAT_S16_LE:
 410                 break;
 411         case SNDRV_PCM_FORMAT_S20_3LE:
 412                 iface |= (1 << 5);
 413                 break;
 414         case SNDRV_PCM_FORMAT_S24_LE:
 415                 iface |= (2 << 5);
 416                 break;
 417         case SNDRV_PCM_FORMAT_S32_LE:
 418                 iface |= (3 << 5);
 419                 break;
 420         }
 421         ret = snd_soc_write(codec, WM8940_COMPANDINGCTL, companding);
 422         if (ret)
 423                 goto error_ret;
 424         ret = snd_soc_write(codec, WM8940_IFACE, iface);
 425
 426 error_ret:
 427         return ret;
 428 }
 429
 430 static int wm8940_mute(struct snd_soc_dai *dai, int mute)
 431 {
 432         struct snd_soc_codec *codec = dai->codec;
 433         u16 mute_reg = snd_soc_read(codec, WM8940_DAC) & 0xffbf;
 434
 435         if (mute)
 436                 mute_reg |= 0x40;
 437
 438         return snd_soc_write(codec, WM8940_DAC, mute_reg);
 439 }
 440
 441 static int wm8940_set_bias_level(struct snd_soc_codec *codec,
 442                                  enum snd_soc_bias_level level)
 443 {
 444         u16 val;
 445         u16 pwr_reg = snd_soc_read(codec, WM8940_POWER1) & 0x1F0;
 446         int ret = 0;
 447
 448         switch (level) {
 449         case SND_SOC_BIAS_ON:
 450                 /* ensure bufioen and biasen */
 451                 pwr_reg |= (1 << 2) | (1 << 3);
 452                 /* Enable thermal shutdown */
 453                 val = snd_soc_read(codec, WM8940_OUTPUTCTL);
 454                 ret = snd_soc_write(codec, WM8940_OUTPUTCTL, val | 0x2);
 455                 if (ret)
 456                         break;
 457                 /* set vmid to 75k */
 458                 ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg | 0x1);
 459                 break;
 460         case SND_SOC_BIAS_PREPARE:
 461                 /* ensure bufioen and biasen */
 462                 pwr_reg |= (1 << 2) | (1 << 3);
 463                 ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg | 0x1);
 464                 break;
 465         case SND_SOC_BIAS_STANDBY:
 466                 /* ensure bufioen and biasen */
 467                 pwr_reg |= (1 << 2) | (1 << 3);
 468                 /* set vmid to 300k for standby */
 469                 ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg | 0x2);
 470                 break;
 471         case SND_SOC_BIAS_OFF:
 472                 ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg);
 473                 break;
 474         }
 475
 476         return ret;
 477 }
 478
 479 struct pll_ {
 480         unsigned int pre_scale:2;
 481         unsigned int n:4;
 482         unsigned int k;
 483 };
 484
 485 static struct pll_ pll_div;
 486
 487 /* The size in bits of the pll divide multiplied by 10
 488  * to allow rounding later */
 489 #define FIXED_PLL_SIZE ((1 << 24) * 10)
 490 static void pll_factors(unsigned int target, unsigned int source)
 491 {
 492         unsigned long long Kpart;
 493         unsigned int K, Ndiv, Nmod;
 494         /* The left shift ist to avoid accuracy loss when right shifting */
 495         Ndiv = target / source;
 496
 497         if (Ndiv > 12) {
 498                 source <<= 1;
 499                 /* Multiply by 2 */
 500                 pll_div.pre_scale = 0;
 501                 Ndiv = target / source;
 502         } else if (Ndiv < 3) {
 503                 source >>= 2;
 504                 /* Divide by 4 */
 505                 pll_div.pre_scale = 3;
 506                 Ndiv = target / source;
 507         } else if (Ndiv < 6) {
 508                 source >>= 1;
 509                 /* divide by 2 */
 510                 pll_div.pre_scale = 2;
 511                 Ndiv = target / source;
 512         } else
 513                 pll_div.pre_scale = 1;
 514
 515         if ((Ndiv < 6) || (Ndiv > 12))
 516                 printk(KERN_WARNING
 517                         "WM8940 N value %d outwith recommended range!d\n",
 518                         Ndiv);
 519
 520         pll_div.n = Ndiv;
 521         Nmod = target % source;
 522         Kpart = FIXED_PLL_SIZE * (long long)Nmod;
 523
 524         do_div(Kpart, source);
 525
 526         K = Kpart & 0xFFFFFFFF;
 527
 528         /* Check if we need to round */
 529         if ((K % 10) >= 5)
 530                 K += 5;
 531
 532         /* Move down to proper range now rounding is done */
 533         K /= 10;
 534
 535         pll_div.k = K;
 536 }
 537
 538 /* Untested at the moment */
 539 static int wm8940_set_dai_pll(struct snd_soc_dai *codec_dai,
 540                 int pll_id, unsigned int freq_in, unsigned int freq_out)
 541 {
 542         struct snd_soc_codec *codec = codec_dai->codec;
 543         u16 reg;
 544
 545         /* Turn off PLL */
 546         reg = snd_soc_read(codec, WM8940_POWER1);
 547         snd_soc_write(codec, WM8940_POWER1, reg & 0x1df);
 548
 549         if (freq_in == 0 || freq_out == 0) {
 550                 /* Clock CODEC directly from MCLK */
 551                 reg = snd_soc_read(codec, WM8940_CLOCK);
 552                 snd_soc_write(codec, WM8940_CLOCK, reg & 0x0ff);
 553                 /* Pll power down */
 554                 snd_soc_write(codec, WM8940_PLLN, (1 << 7));
 555                 return 0;
 556         }
 557
 558         /* Pll is followed by a frequency divide by 4 */
 559         pll_factors(freq_out*4, freq_in);
 560         if (pll_div.k)
 561                 snd_soc_write(codec, WM8940_PLLN,
 562                              (pll_div.pre_scale << 4) | pll_div.n | (1 << 6));
 563         else /* No factional component */
 564                 snd_soc_write(codec, WM8940_PLLN,
 565                              (pll_div.pre_scale << 4) | pll_div.n);
 566         snd_soc_write(codec, WM8940_PLLK1, pll_div.k >> 18);
 567         snd_soc_write(codec, WM8940_PLLK2, (pll_div.k >> 9) & 0x1ff);
 568         snd_soc_write(codec, WM8940_PLLK3, pll_div.k & 0x1ff);
 569         /* Enable the PLL */
 570         reg = snd_soc_read(codec, WM8940_POWER1);
 571         snd_soc_write(codec, WM8940_POWER1, reg | 0x020);
 572
 573         /* Run CODEC from PLL instead of MCLK */
 574         reg = snd_soc_read(codec, WM8940_CLOCK);
 575         snd_soc_write(codec, WM8940_CLOCK, reg | 0x100);
 576
 577         return 0;
 578 }
 579
 580 static int wm8940_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 581                                  int clk_id, unsigned int freq, int dir)
 582 {
 583         struct snd_soc_codec *codec = codec_dai->codec;
 584         struct wm8940_priv *wm8940 = codec->private_data;
 585
 586         switch (freq) {
 587         case 11289600:
 588         case 12000000:
 589         case 12288000:
 590         case 16934400:
 591         case 18432000:
 592                 wm8940->sysclk = freq;
 593                 return 0;
 594         }
 595         return -EINVAL;
 596 }
 597
 598 static int wm8940_set_dai_clkdiv(struct snd_soc_dai *codec_dai,
 599                                  int div_id, int div)
 600 {
 601         struct snd_soc_codec *codec = codec_dai->codec;
 602         u16 reg;
 603         int ret = 0;
 604
 605         switch (div_id) {
 606         case WM8940_BCLKDIV:
 607                 reg = snd_soc_read(codec, WM8940_CLOCK) & 0xFFEF3;
 608                 ret = snd_soc_write(codec, WM8940_CLOCK, reg | (div << 2));
 609                 break;
 610         case WM8940_MCLKDIV:
 611                 reg = snd_soc_read(codec, WM8940_CLOCK) & 0xFF1F;
 612                 ret = snd_soc_write(codec, WM8940_CLOCK, reg | (div << 5));
 613                 break;
 614         case WM8940_OPCLKDIV:
 615                 reg = snd_soc_read(codec, WM8940_ADDCNTRL) & 0xFFCF;
 616                 ret = snd_soc_write(codec, WM8940_ADDCNTRL, reg | (div << 4));
 617                 break;
 618         }
 619         return ret;
 620 }
 621
 622 #define WM8940_RATES SNDRV_PCM_RATE_8000_48000
 623
 624 #define WM8940_FORMATS (SNDRV_PCM_FMTBIT_S8 |                           \
 625                         SNDRV_PCM_FMTBIT_S16_LE |                       \
 626                         SNDRV_PCM_FMTBIT_S20_3LE |                      \
 627                         SNDRV_PCM_FMTBIT_S24_LE |                       \
 628                         SNDRV_PCM_FMTBIT_S32_LE)
 629
 630 static struct snd_soc_dai_ops wm8940_dai_ops = {
 631         .hw_params = wm8940_i2s_hw_params,
 632         .set_sysclk = wm8940_set_dai_sysclk,
 633         .digital_mute = wm8940_mute,
 634         .set_fmt = wm8940_set_dai_fmt,
 635         .set_clkdiv = wm8940_set_dai_clkdiv,
 636         .set_pll = wm8940_set_dai_pll,
 637 };
 638
 639 struct snd_soc_dai wm8940_dai = {
 640         .name = "WM8940",
 641         .playback = {
 642                 .stream_name = "Playback",
 643                 .channels_min = 1,
 644                 .channels_max = 2,
 645                 .rates = WM8940_RATES,
 646                 .formats = WM8940_FORMATS,
 647         },
 648         .capture = {
 649                 .stream_name = "Capture",
 650                 .channels_min = 1,
 651                 .channels_max = 2,
 652                 .rates = WM8940_RATES,
 653                 .formats = WM8940_FORMATS,
 654         },
 655         .ops = &wm8940_dai_ops,
 656         .symmetric_rates = 1,
 657 };
 658 EXPORT_SYMBOL_GPL(wm8940_dai);
 659
 660 static int wm8940_suspend(struct platform_device *pdev, pm_message_t state)
 661 {
 662         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 663         struct snd_soc_codec *codec = socdev->card->codec;
 664
 665         return wm8940_set_bias_level(codec, SND_SOC_BIAS_OFF);
 666 }
 667
 668 static int wm8940_resume(struct platform_device *pdev)
 669 {
 670         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 671         struct snd_soc_codec *codec = socdev->card->codec;
 672         int i;
 673         int ret;
 674         u8 data[3];
 675         u16 *cache = codec->reg_cache;
 676
 677         /* Sync reg_cache with the hardware
 678          * Could use auto incremented writes to speed this up
 679          */
 680         for (i = 0; i < ARRAY_SIZE(wm8940_reg_defaults); i++) {
 681                 data[0] = i;
 682                 data[1] = (cache[i] & 0xFF00) >> 8;
 683                 data[2] = cache[i] & 0x00FF;
 684                 ret = codec->hw_write(codec->control_data, data, 3);
 685                 if (ret < 0)
 686                         goto error_ret;
 687                 else if (ret != 3) {
 688                         ret = -EIO;
 689                         goto error_ret;
 690                 }
 691         }
 692         ret = wm8940_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 693         if (ret)
 694                 goto error_ret;
 695         ret = wm8940_set_bias_level(codec, codec->suspend_bias_level);
 696
 697 error_ret:
 698         return ret;
 699 }
 700
 701 static struct snd_soc_codec *wm8940_codec;
 702
 703 static int wm8940_probe(struct platform_device *pdev)
 704 {
 705         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 706         struct snd_soc_codec *codec;
 707
 708         int ret = 0;
 709
 710         if (wm8940_codec == NULL) {
 711                 dev_err(&pdev->dev, "Codec device not registered\n");
 712                 return -ENODEV;
 713         }
 714
 715         socdev->card->codec = wm8940_codec;
 716         codec = wm8940_codec;
 717
 718         mutex_init(&codec->mutex);
 719         /* register pcms */
 720         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 721         if (ret < 0) {
 722                 dev_err(codec->dev, "failed to create pcms: %d\n", ret);
 723                 goto pcm_err;
 724         }
 725
 726         ret = snd_soc_add_controls(codec, wm8940_snd_controls,
 727                              ARRAY_SIZE(wm8940_snd_controls));
 728         if (ret)
 729                 goto error_free_pcms;
 730         ret = wm8940_add_widgets(codec);
 731         if (ret)
 732                 goto error_free_pcms;
 733
 734         ret = snd_soc_init_card(socdev);
 735         if (ret < 0) {
 736                 dev_err(codec->dev, "failed to register card: %d\n", ret);
 737                 goto error_free_pcms;
 738         }
 739
 740         return ret;
 741
 742 error_free_pcms:
 743         snd_soc_free_pcms(socdev);
 744         snd_soc_dapm_free(socdev);
 745 pcm_err:
 746         return ret;
 747 }
 748
 749 static int wm8940_remove(struct platform_device *pdev)
 750 {
 751         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 752
 753         snd_soc_free_pcms(socdev);
 754         snd_soc_dapm_free(socdev);
 755
 756         return 0;
 757 }
 758
 759 struct snd_soc_codec_device soc_codec_dev_wm8940 = {
 760         .probe = wm8940_probe,
 761         .remove = wm8940_remove,
 762         .suspend = wm8940_suspend,
 763         .resume = wm8940_resume,
 764 };
 765 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8940);
 766
 767 static int wm8940_register(struct wm8940_priv *wm8940,
 768                            enum snd_soc_control_type control)
 769 {
 770         struct wm8940_setup_data *pdata = wm8940->codec.dev->platform_data;
 771         struct snd_soc_codec *codec = &wm8940->codec;
 772         int ret;
 773         u16 reg;
 774         if (wm8940_codec) {
 775                 dev_err(codec->dev, "Another WM8940 is registered\n");
 776                 return -EINVAL;
 777         }
 778
 779         INIT_LIST_HEAD(&codec->dapm_widgets);
 780         INIT_LIST_HEAD(&codec->dapm_paths);
 781
 782         codec->private_data = wm8940;
 783         codec->name = "WM8940";
 784         codec->owner = THIS_MODULE;
 785         codec->bias_level = SND_SOC_BIAS_OFF;
 786         codec->set_bias_level = wm8940_set_bias_level;
 787         codec->dai = &wm8940_dai;
 788         codec->num_dai = 1;
 789         codec->reg_cache_size = ARRAY_SIZE(wm8940_reg_defaults);
 790         codec->reg_cache = &wm8940->reg_cache;
 791
 792         ret = snd_soc_codec_set_cache_io(codec, 8, 16, control);
 793         if (ret < 0) {
 794                 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
 795                 return ret;
 796         }
 797
 798         memcpy(codec->reg_cache, wm8940_reg_defaults,
 799                sizeof(wm8940_reg_defaults));
 800
 801         ret = wm8940_reset(codec);
 802         if (ret < 0) {
 803                 dev_err(codec->dev, "Failed to issue reset\n");
 804                 return ret;
 805         }
 806
 807         wm8940_dai.dev = codec->dev;
 808
 809         wm8940_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 810
 811         ret = snd_soc_write(codec, WM8940_POWER1, 0x180);
 812         if (ret < 0)
 813                 return ret;
 814
 815         if (!pdata)
 816                 dev_warn(codec->dev, "No platform data supplied\n");
 817         else {
 818                 reg = snd_soc_read(codec, WM8940_OUTPUTCTL);
 819                 ret = snd_soc_write(codec, WM8940_OUTPUTCTL, reg | pdata->vroi);
 820                 if (ret < 0)
 821                         return ret;
 822         }
 823
 824
 825         wm8940_codec = codec;
 826
 827         ret = snd_soc_register_codec(codec);
 828         if (ret) {
 829                 dev_err(codec->dev, "Failed to register codec: %d\n", ret);
 830                 return ret;
 831         }
 832
 833         ret = snd_soc_register_dai(&wm8940_dai);
 834         if (ret) {
 835                 dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
 836                 snd_soc_unregister_codec(codec);
 837                 return ret;
 838         }
 839
 840         return 0;
 841 }
 842
 843 static void wm8940_unregister(struct wm8940_priv *wm8940)
 844 {
 845         wm8940_set_bias_level(&wm8940->codec, SND_SOC_BIAS_OFF);
 846         snd_soc_unregister_dai(&wm8940_dai);
 847         snd_soc_unregister_codec(&wm8940->codec);
 848         kfree(wm8940);
 849         wm8940_codec = NULL;
 850 }
 851
 852 static int wm8940_i2c_probe(struct i2c_client *i2c,
 853                             const struct i2c_device_id *id)
 854 {
 855         struct wm8940_priv *wm8940;
 856         struct snd_soc_codec *codec;
 857
 858         wm8940 = kzalloc(sizeof *wm8940, GFP_KERNEL);
 859         if (wm8940 == NULL)
 860                 return -ENOMEM;
 861
 862         codec = &wm8940->codec;
 863         codec->hw_write = (hw_write_t)i2c_master_send;
 864         i2c_set_clientdata(i2c, wm8940);
 865         codec->control_data = i2c;
 866         codec->dev = &i2c->dev;
 867
 868         return wm8940_register(wm8940, SND_SOC_I2C);
 869 }
 870
 871 static int __devexit wm8940_i2c_remove(struct i2c_client *client)
 872 {
 873         struct wm8940_priv *wm8940 = i2c_get_clientdata(client);
 874
 875         wm8940_unregister(wm8940);
 876
 877         return 0;
 878 }
 879
 880 #ifdef CONFIG_PM
 881 static int wm8940_i2c_suspend(struct i2c_client *client, pm_message_t msg)
 882 {
 883         return snd_soc_suspend_device(&client->dev);
 884 }
 885
 886 static int wm8940_i2c_resume(struct i2c_client *client)
 887 {
 888         return snd_soc_resume_device(&client->dev);
 889 }
 890 #else
 891 #define wm8940_i2c_suspend NULL
 892 #define wm8940_i2c_resume NULL
 893 #endif
 894
 895 static const struct i2c_device_id wm8940_i2c_id[] = {
 896         { "wm8940", 0 },
 897         { }
 898 };
 899 MODULE_DEVICE_TABLE(i2c, wm8940_i2c_id);
 900
 901 static struct i2c_driver wm8940_i2c_driver = {
 902         .driver = {
 903                 .name = "WM8940 I2C Codec",
 904                 .owner = THIS_MODULE,
 905         },
 906         .probe = wm8940_i2c_probe,
 907         .remove = __devexit_p(wm8940_i2c_remove),
 908         .suspend = wm8940_i2c_suspend,
 909         .resume = wm8940_i2c_resume,
 910         .id_table = wm8940_i2c_id,
 911 };
 912
 913 static int __init wm8940_modinit(void)
 914 {
 915         int ret;
 916
 917         ret = i2c_add_driver(&wm8940_i2c_driver);
 918         if (ret)
 919                 printk(KERN_ERR "Failed to register WM8940 I2C driver: %d\n",
 920                        ret);
 921         return ret;
 922 }
 923 module_init(wm8940_modinit);
 924
 925 static void __exit wm8940_exit(void)
 926 {
 927         i2c_del_driver(&wm8940_i2c_driver);
 928 }
 929 module_exit(wm8940_exit);
 930
 931 MODULE_DESCRIPTION("ASoC WM8940 driver");
 932 MODULE_AUTHOR("Jonathan Cameron");
 933 MODULE_LICENSE("GPL");