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 inline unsigned int wm8940_read_reg_cache(struct snd_soc_codec *codec,
 110                                                  unsigned int reg)
 111 {
 112         u16 *cache = codec->reg_cache;
 113
 114         if (reg >= ARRAY_SIZE(wm8940_reg_defaults))
 115                 return -1;
 116
 117         return cache[reg];
 118 }
 119
 120 static inline int wm8940_write_reg_cache(struct snd_soc_codec *codec,
 121                                           u16 reg, unsigned int value)
 122 {
 123         u16 *cache = codec->reg_cache;
 124
 125         if (reg >= ARRAY_SIZE(wm8940_reg_defaults))
 126                 return -1;
 127
 128         cache[reg] = value;
 129
 130         return 0;
 131 }
 132
 133 static int wm8940_write(struct snd_soc_codec *codec, unsigned int reg,
 134                         unsigned int value)
 135 {
 136         int ret;
 137         u8 data[3] = { reg,
 138                        (value & 0xff00) >> 8,
 139                        (value & 0x00ff)
 140         };
 141
 142         wm8940_write_reg_cache(codec, reg, value);
 143
 144         ret = codec->hw_write(codec->control_data, data, 3);
 145
 146         if (ret < 0)
 147                 return ret;
 148         else if (ret != 3)
 149                 return -EIO;
 150         return 0;
 151 }
 152
 153 static const char *wm8940_companding[] = { "Off", "NC", "u-law", "A-law" };
 154 static const struct soc_enum wm8940_adc_companding_enum
 155 = SOC_ENUM_SINGLE(WM8940_COMPANDINGCTL, 1, 4, wm8940_companding);
 156 static const struct soc_enum wm8940_dac_companding_enum
 157 = SOC_ENUM_SINGLE(WM8940_COMPANDINGCTL, 3, 4, wm8940_companding);
 158
 159 static const char *wm8940_alc_mode_text[] = {"ALC", "Limiter"};
 160 static const struct soc_enum wm8940_alc_mode_enum
 161 = SOC_ENUM_SINGLE(WM8940_ALC3, 8, 2, wm8940_alc_mode_text);
 162
 163 static const char *wm8940_mic_bias_level_text[] = {"0.9", "0.65"};
 164 static const struct soc_enum wm8940_mic_bias_level_enum
 165 = SOC_ENUM_SINGLE(WM8940_INPUTCTL, 8, 2, wm8940_mic_bias_level_text);
 166
 167 static const char *wm8940_filter_mode_text[] = {"Audio", "Application"};
 168 static const struct soc_enum wm8940_filter_mode_enum
 169 = SOC_ENUM_SINGLE(WM8940_ADC, 7, 2, wm8940_filter_mode_text);
 170
 171 static DECLARE_TLV_DB_SCALE(wm8940_spk_vol_tlv, -5700, 100, 1);
 172 static DECLARE_TLV_DB_SCALE(wm8940_att_tlv, -1000, 1000, 0);
 173 static DECLARE_TLV_DB_SCALE(wm8940_pga_vol_tlv, -1200, 75, 0);
 174 static DECLARE_TLV_DB_SCALE(wm8940_alc_min_tlv, -1200, 600, 0);
 175 static DECLARE_TLV_DB_SCALE(wm8940_alc_max_tlv, 675, 600, 0);
 176 static DECLARE_TLV_DB_SCALE(wm8940_alc_tar_tlv, -2250, 50, 0);
 177 static DECLARE_TLV_DB_SCALE(wm8940_lim_boost_tlv, 0, 100, 0);
 178 static DECLARE_TLV_DB_SCALE(wm8940_lim_thresh_tlv, -600, 100, 0);
 179 static DECLARE_TLV_DB_SCALE(wm8940_adc_tlv, -12750, 50, 1);
 180 static DECLARE_TLV_DB_SCALE(wm8940_capture_boost_vol_tlv, 0, 2000, 0);
 181
 182 static const struct snd_kcontrol_new wm8940_snd_controls[] = {
 183         SOC_SINGLE("Digital Loopback Switch", WM8940_COMPANDINGCTL,
 184                    6, 1, 0),
 185         SOC_ENUM("DAC Companding", wm8940_dac_companding_enum),
 186         SOC_ENUM("ADC Companding", wm8940_adc_companding_enum),
 187
 188         SOC_ENUM("ALC Mode", wm8940_alc_mode_enum),
 189         SOC_SINGLE("ALC Switch", WM8940_ALC1, 8, 1, 0),
 190         SOC_SINGLE_TLV("ALC Capture Max Gain", WM8940_ALC1,
 191                        3, 7, 1, wm8940_alc_max_tlv),
 192         SOC_SINGLE_TLV("ALC Capture Min Gain", WM8940_ALC1,
 193                        0, 7, 0, wm8940_alc_min_tlv),
 194         SOC_SINGLE_TLV("ALC Capture Target", WM8940_ALC2,
 195                        0, 14, 0, wm8940_alc_tar_tlv),
 196         SOC_SINGLE("ALC Capture Hold", WM8940_ALC2, 4, 10, 0),
 197         SOC_SINGLE("ALC Capture Decay", WM8940_ALC3, 4, 10, 0),
 198         SOC_SINGLE("ALC Capture Attach", WM8940_ALC3, 0, 10, 0),
 199         SOC_SINGLE("ALC ZC Switch", WM8940_ALC4, 1, 1, 0),
 200         SOC_SINGLE("ALC Capture Noise Gate Switch", WM8940_NOISEGATE,
 201                    3, 1, 0),
 202         SOC_SINGLE("ALC Capture Noise Gate Threshold", WM8940_NOISEGATE,
 203                    0, 7, 0),
 204
 205         SOC_SINGLE("DAC Playback Limiter Switch", WM8940_DACLIM1, 8, 1, 0),
 206         SOC_SINGLE("DAC Playback Limiter Attack", WM8940_DACLIM1, 0, 9, 0),
 207         SOC_SINGLE("DAC Playback Limiter Decay", WM8940_DACLIM1, 4, 11, 0),
 208         SOC_SINGLE_TLV("DAC Playback Limiter Threshold", WM8940_DACLIM2,
 209                        4, 9, 1, wm8940_lim_thresh_tlv),
 210         SOC_SINGLE_TLV("DAC Playback Limiter Boost", WM8940_DACLIM2,
 211                        0, 12, 0, wm8940_lim_boost_tlv),
 212
 213         SOC_SINGLE("Capture PGA ZC Switch", WM8940_PGAGAIN, 7, 1, 0),
 214         SOC_SINGLE_TLV("Capture PGA Volume", WM8940_PGAGAIN,
 215                        0, 63, 0, wm8940_pga_vol_tlv),
 216         SOC_SINGLE_TLV("Digital Playback Volume", WM8940_DACVOL,
 217                        0, 255, 0, wm8940_adc_tlv),
 218         SOC_SINGLE_TLV("Digital Capture Volume", WM8940_ADCVOL,
 219                        0, 255, 0, wm8940_adc_tlv),
 220         SOC_ENUM("Mic Bias Level", wm8940_mic_bias_level_enum),
 221         SOC_SINGLE_TLV("Capture Boost Volue", WM8940_ADCBOOST,
 222                        8, 1, 0, wm8940_capture_boost_vol_tlv),
 223         SOC_SINGLE_TLV("Speaker Playback Volume", WM8940_SPKVOL,
 224                        0, 63, 0, wm8940_spk_vol_tlv),
 225         SOC_SINGLE("Speaker Playback Switch", WM8940_SPKVOL,  6, 1, 1),
 226
 227         SOC_SINGLE_TLV("Speaker Mixer Line Bypass Volume", WM8940_SPKVOL,
 228                        8, 1, 1, wm8940_att_tlv),
 229         SOC_SINGLE("Speaker Playback ZC Switch", WM8940_SPKVOL, 7, 1, 0),
 230
 231         SOC_SINGLE("Mono Out Switch", WM8940_MONOMIX, 6, 1, 1),
 232         SOC_SINGLE_TLV("Mono Mixer Line Bypass Volume", WM8940_MONOMIX,
 233                        7, 1, 1, wm8940_att_tlv),
 234
 235         SOC_SINGLE("High Pass Filter Switch", WM8940_ADC, 8, 1, 0),
 236         SOC_ENUM("High Pass Filter Mode", wm8940_filter_mode_enum),
 237         SOC_SINGLE("High Pass Filter Cut Off", WM8940_ADC, 4, 7, 0),
 238         SOC_SINGLE("ADC Inversion Switch", WM8940_ADC, 0, 1, 0),
 239         SOC_SINGLE("DAC Inversion Switch", WM8940_DAC, 0, 1, 0),
 240         SOC_SINGLE("DAC Auto Mute Switch", WM8940_DAC, 2, 1, 0),
 241         SOC_SINGLE("ZC Timeout Clock Switch", WM8940_ADDCNTRL, 0, 1, 0),
 242 };
 243
 244 static const struct snd_kcontrol_new wm8940_speaker_mixer_controls[] = {
 245         SOC_DAPM_SINGLE("Line Bypass Switch", WM8940_SPKMIX, 1, 1, 0),
 246         SOC_DAPM_SINGLE("Aux Playback Switch", WM8940_SPKMIX, 5, 1, 0),
 247         SOC_DAPM_SINGLE("PCM Playback Switch", WM8940_SPKMIX, 0, 1, 0),
 248 };
 249
 250 static const struct snd_kcontrol_new wm8940_mono_mixer_controls[] = {
 251         SOC_DAPM_SINGLE("Line Bypass Switch", WM8940_MONOMIX, 1, 1, 0),
 252         SOC_DAPM_SINGLE("Aux Playback Switch", WM8940_MONOMIX, 2, 1, 0),
 253         SOC_DAPM_SINGLE("PCM Playback Switch", WM8940_MONOMIX, 0, 1, 0),
 254 };
 255
 256 static DECLARE_TLV_DB_SCALE(wm8940_boost_vol_tlv, -1500, 300, 1);
 257 static const struct snd_kcontrol_new wm8940_input_boost_controls[] = {
 258         SOC_DAPM_SINGLE("Mic PGA Switch", WM8940_PGAGAIN, 6, 1, 1),
 259         SOC_DAPM_SINGLE_TLV("Aux Volume", WM8940_ADCBOOST,
 260                             0, 7, 0, wm8940_boost_vol_tlv),
 261         SOC_DAPM_SINGLE_TLV("Mic Volume", WM8940_ADCBOOST,
 262                             4, 7, 0, wm8940_boost_vol_tlv),
 263 };
 264
 265 static const struct snd_kcontrol_new wm8940_micpga_controls[] = {
 266         SOC_DAPM_SINGLE("AUX Switch", WM8940_INPUTCTL, 2, 1, 0),
 267         SOC_DAPM_SINGLE("MICP Switch", WM8940_INPUTCTL, 0, 1, 0),
 268         SOC_DAPM_SINGLE("MICN Switch", WM8940_INPUTCTL, 1, 1, 0),
 269 };
 270
 271 static const struct snd_soc_dapm_widget wm8940_dapm_widgets[] = {
 272         SND_SOC_DAPM_MIXER("Speaker Mixer", WM8940_POWER3, 2, 0,
 273                            &wm8940_speaker_mixer_controls[0],
 274                            ARRAY_SIZE(wm8940_speaker_mixer_controls)),
 275         SND_SOC_DAPM_MIXER("Mono Mixer", WM8940_POWER3, 3, 0,
 276                            &wm8940_mono_mixer_controls[0],
 277                            ARRAY_SIZE(wm8940_mono_mixer_controls)),
 278         SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8940_POWER3, 0, 0),
 279
 280         SND_SOC_DAPM_PGA("SpkN Out", WM8940_POWER3, 5, 0, NULL, 0),
 281         SND_SOC_DAPM_PGA("SpkP Out", WM8940_POWER3, 6, 0, NULL, 0),
 282         SND_SOC_DAPM_PGA("Mono Out", WM8940_POWER3, 7, 0, NULL, 0),
 283         SND_SOC_DAPM_OUTPUT("MONOOUT"),
 284         SND_SOC_DAPM_OUTPUT("SPKOUTP"),
 285         SND_SOC_DAPM_OUTPUT("SPKOUTN"),
 286
 287         SND_SOC_DAPM_PGA("Aux Input", WM8940_POWER1, 6, 0, NULL, 0),
 288         SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8940_POWER2, 0, 0),
 289         SND_SOC_DAPM_MIXER("Mic PGA", WM8940_POWER2, 2, 0,
 290                            &wm8940_micpga_controls[0],
 291                            ARRAY_SIZE(wm8940_micpga_controls)),
 292         SND_SOC_DAPM_MIXER("Boost Mixer", WM8940_POWER2, 4, 0,
 293                            &wm8940_input_boost_controls[0],
 294                            ARRAY_SIZE(wm8940_input_boost_controls)),
 295         SND_SOC_DAPM_MICBIAS("Mic Bias", WM8940_POWER1, 4, 0),
 296
 297         SND_SOC_DAPM_INPUT("MICN"),
 298         SND_SOC_DAPM_INPUT("MICP"),
 299         SND_SOC_DAPM_INPUT("AUX"),
 300 };
 301
 302 static const struct snd_soc_dapm_route audio_map[] = {
 303         /* Mono output mixer */
 304         {"Mono Mixer", "PCM Playback Switch", "DAC"},
 305         {"Mono Mixer", "Aux Playback Switch", "Aux Input"},
 306         {"Mono Mixer", "Line Bypass Switch", "Boost Mixer"},
 307
 308         /* Speaker output mixer */
 309         {"Speaker Mixer", "PCM Playback Switch", "DAC"},
 310         {"Speaker Mixer", "Aux Playback Switch", "Aux Input"},
 311         {"Speaker Mixer", "Line Bypass Switch", "Boost Mixer"},
 312
 313         /* Outputs */
 314         {"Mono Out", NULL, "Mono Mixer"},
 315         {"MONOOUT", NULL, "Mono Out"},
 316         {"SpkN Out", NULL, "Speaker Mixer"},
 317         {"SpkP Out", NULL, "Speaker Mixer"},
 318         {"SPKOUTN", NULL, "SpkN Out"},
 319         {"SPKOUTP", NULL, "SpkP Out"},
 320
 321         /*  Microphone PGA */
 322         {"Mic PGA", "MICN Switch", "MICN"},
 323         {"Mic PGA", "MICP Switch", "MICP"},
 324         {"Mic PGA", "AUX Switch", "AUX"},
 325
 326         /* Boost Mixer */
 327         {"Boost Mixer", "Mic PGA Switch", "Mic PGA"},
 328         {"Boost Mixer", "Mic Volume",  "MICP"},
 329         {"Boost Mixer", "Aux Volume", "Aux Input"},
 330
 331         {"ADC", NULL, "Boost Mixer"},
 332 };
 333
 334 static int wm8940_add_widgets(struct snd_soc_codec *codec)
 335 {
 336         int ret;
 337
 338         ret = snd_soc_dapm_new_controls(codec, wm8940_dapm_widgets,
 339                                         ARRAY_SIZE(wm8940_dapm_widgets));
 340         if (ret)
 341                 goto error_ret;
 342         ret = snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));
 343         if (ret)
 344                 goto error_ret;
 345         ret = snd_soc_dapm_new_widgets(codec);
 346
 347 error_ret:
 348         return ret;
 349 }
 350
 351 #define wm8940_reset(c) wm8940_write(c, WM8940_SOFTRESET, 0);
 352
 353 static int wm8940_set_dai_fmt(struct snd_soc_dai *codec_dai,
 354                               unsigned int fmt)
 355 {
 356         struct snd_soc_codec *codec = codec_dai->codec;
 357         u16 iface = wm8940_read_reg_cache(codec, WM8940_IFACE) & 0xFE67;
 358         u16 clk = wm8940_read_reg_cache(codec, WM8940_CLOCK) & 0x1fe;
 359
 360         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 361         case SND_SOC_DAIFMT_CBM_CFM:
 362                 clk |= 1;
 363                 break;
 364         case SND_SOC_DAIFMT_CBS_CFS:
 365                 break;
 366         default:
 367                 return -EINVAL;
 368         }
 369         wm8940_write(codec, WM8940_CLOCK, clk);
 370
 371         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 372         case SND_SOC_DAIFMT_I2S:
 373                 iface |= (2 << 3);
 374                 break;
 375         case SND_SOC_DAIFMT_LEFT_J:
 376                 iface |= (1 << 3);
 377                 break;
 378         case SND_SOC_DAIFMT_RIGHT_J:
 379                 break;
 380         case SND_SOC_DAIFMT_DSP_A:
 381                 iface |= (3 << 3);
 382                 break;
 383         case SND_SOC_DAIFMT_DSP_B:
 384                 iface |= (3 << 3) | (1 << 7);
 385                 break;
 386         }
 387
 388         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 389         case SND_SOC_DAIFMT_NB_NF:
 390                 break;
 391         case SND_SOC_DAIFMT_NB_IF:
 392                 iface |= (1 << 7);
 393                 break;
 394         case SND_SOC_DAIFMT_IB_NF:
 395                 iface |= (1 << 8);
 396                 break;
 397         case SND_SOC_DAIFMT_IB_IF:
 398                 iface |= (1 << 8) | (1 << 7);
 399                 break;
 400         }
 401
 402         wm8940_write(codec, WM8940_IFACE, iface);
 403
 404         return 0;
 405 }
 406
 407 static int wm8940_i2s_hw_params(struct snd_pcm_substream *substream,
 408                                 struct snd_pcm_hw_params *params,
 409                                 struct snd_soc_dai *dai)
 410 {
 411         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 412         struct snd_soc_device *socdev = rtd->socdev;
 413         struct snd_soc_codec *codec = socdev->card->codec;
 414         u16 iface = wm8940_read_reg_cache(codec, WM8940_IFACE) & 0xFD9F;
 415         u16 addcntrl = wm8940_read_reg_cache(codec, WM8940_ADDCNTRL) & 0xFFF1;
 416         u16 companding =  wm8940_read_reg_cache(codec,
 417                                                 WM8940_COMPANDINGCTL) & 0xFFDF;
 418         int ret;
 419
 420         /* LoutR control */
 421         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE
 422             && params_channels(params) == 2)
 423                 iface |= (1 << 9);
 424
 425         switch (params_rate(params)) {
 426         case SNDRV_PCM_RATE_8000:
 427                 addcntrl |= (0x5 << 1);
 428                 break;
 429         case SNDRV_PCM_RATE_11025:
 430                 addcntrl |= (0x4 << 1);
 431                 break;
 432         case SNDRV_PCM_RATE_16000:
 433                 addcntrl |= (0x3 << 1);
 434                 break;
 435         case SNDRV_PCM_RATE_22050:
 436                 addcntrl |= (0x2 << 1);
 437                 break;
 438         case SNDRV_PCM_RATE_32000:
 439                 addcntrl |= (0x1 << 1);
 440                 break;
 441         case SNDRV_PCM_RATE_44100:
 442         case SNDRV_PCM_RATE_48000:
 443                 break;
 444         }
 445         ret = wm8940_write(codec, WM8940_ADDCNTRL, addcntrl);
 446         if (ret)
 447                 goto error_ret;
 448
 449         switch (params_format(params)) {
 450         case SNDRV_PCM_FORMAT_S8:
 451                 companding = companding | (1 << 5);
 452                 break;
 453         case SNDRV_PCM_FORMAT_S16_LE:
 454                 break;
 455         case SNDRV_PCM_FORMAT_S20_3LE:
 456                 iface |= (1 << 5);
 457                 break;
 458         case SNDRV_PCM_FORMAT_S24_LE:
 459                 iface |= (2 << 5);
 460                 break;
 461         case SNDRV_PCM_FORMAT_S32_LE:
 462                 iface |= (3 << 5);
 463                 break;
 464         }
 465         ret = wm8940_write(codec, WM8940_COMPANDINGCTL, companding);
 466         if (ret)
 467                 goto error_ret;
 468         ret = wm8940_write(codec, WM8940_IFACE, iface);
 469
 470 error_ret:
 471         return ret;
 472 }
 473
 474 static int wm8940_mute(struct snd_soc_dai *dai, int mute)
 475 {
 476         struct snd_soc_codec *codec = dai->codec;
 477         u16 mute_reg = wm8940_read_reg_cache(codec, WM8940_DAC) & 0xffbf;
 478
 479         if (mute)
 480                 mute_reg |= 0x40;
 481
 482         return wm8940_write(codec, WM8940_DAC, mute_reg);
 483 }
 484
 485 static int wm8940_set_bias_level(struct snd_soc_codec *codec,
 486                                  enum snd_soc_bias_level level)
 487 {
 488         u16 val;
 489         u16 pwr_reg = wm8940_read_reg_cache(codec, WM8940_POWER1) & 0x1F0;
 490         int ret = 0;
 491
 492         switch (level) {
 493         case SND_SOC_BIAS_ON:
 494                 /* ensure bufioen and biasen */
 495                 pwr_reg |= (1 << 2) | (1 << 3);
 496                 /* Enable thermal shutdown */
 497                 val = wm8940_read_reg_cache(codec, WM8940_OUTPUTCTL);
 498                 ret = wm8940_write(codec, WM8940_OUTPUTCTL, val | 0x2);
 499                 if (ret)
 500                         break;
 501                 /* set vmid to 75k */
 502                 ret = wm8940_write(codec, WM8940_POWER1, pwr_reg | 0x1);
 503                 break;
 504         case SND_SOC_BIAS_PREPARE:
 505                 /* ensure bufioen and biasen */
 506                 pwr_reg |= (1 << 2) | (1 << 3);
 507                 ret = wm8940_write(codec, WM8940_POWER1, pwr_reg | 0x1);
 508                 break;
 509         case SND_SOC_BIAS_STANDBY:
 510                 /* ensure bufioen and biasen */
 511                 pwr_reg |= (1 << 2) | (1 << 3);
 512                 /* set vmid to 300k for standby */
 513                 ret = wm8940_write(codec, WM8940_POWER1, pwr_reg | 0x2);
 514                 break;
 515         case SND_SOC_BIAS_OFF:
 516                 ret = wm8940_write(codec, WM8940_POWER1, pwr_reg);
 517                 break;
 518         }
 519
 520         return ret;
 521 }
 522
 523 struct pll_ {
 524         unsigned int pre_scale:2;
 525         unsigned int n:4;
 526         unsigned int k;
 527 };
 528
 529 static struct pll_ pll_div;
 530
 531 /* The size in bits of the pll divide multiplied by 10
 532  * to allow rounding later */
 533 #define FIXED_PLL_SIZE ((1 << 24) * 10)
 534 static void pll_factors(unsigned int target, unsigned int source)
 535 {
 536         unsigned long long Kpart;
 537         unsigned int K, Ndiv, Nmod;
 538         /* The left shift ist to avoid accuracy loss when right shifting */
 539         Ndiv = target / source;
 540
 541         if (Ndiv > 12) {
 542                 source <<= 1;
 543                 /* Multiply by 2 */
 544                 pll_div.pre_scale = 0;
 545                 Ndiv = target / source;
 546         } else if (Ndiv < 3) {
 547                 source >>= 2;
 548                 /* Divide by 4 */
 549                 pll_div.pre_scale = 3;
 550                 Ndiv = target / source;
 551         } else if (Ndiv < 6) {
 552                 source >>= 1;
 553                 /* divide by 2 */
 554                 pll_div.pre_scale = 2;
 555                 Ndiv = target / source;
 556         } else
 557                 pll_div.pre_scale = 1;
 558
 559         if ((Ndiv < 6) || (Ndiv > 12))
 560                 printk(KERN_WARNING
 561                         "WM8940 N value %d outwith recommended range!d\n",
 562                         Ndiv);
 563
 564         pll_div.n = Ndiv;
 565         Nmod = target % source;
 566         Kpart = FIXED_PLL_SIZE * (long long)Nmod;
 567
 568         do_div(Kpart, source);
 569
 570         K = Kpart & 0xFFFFFFFF;
 571
 572         /* Check if we need to round */
 573         if ((K % 10) >= 5)
 574                 K += 5;
 575
 576         /* Move down to proper range now rounding is done */
 577         K /= 10;
 578
 579         pll_div.k = K;
 580 }
 581
 582 /* Untested at the moment */
 583 static int wm8940_set_dai_pll(struct snd_soc_dai *codec_dai,
 584                 int pll_id, unsigned int freq_in, unsigned int freq_out)
 585 {
 586         struct snd_soc_codec *codec = codec_dai->codec;
 587         u16 reg;
 588
 589         /* Turn off PLL */
 590         reg = wm8940_read_reg_cache(codec, WM8940_POWER1);
 591         wm8940_write(codec, WM8940_POWER1, reg & 0x1df);
 592
 593         if (freq_in == 0 || freq_out == 0) {
 594                 /* Clock CODEC directly from MCLK */
 595                 reg = wm8940_read_reg_cache(codec, WM8940_CLOCK);
 596                 wm8940_write(codec, WM8940_CLOCK, reg & 0x0ff);
 597                 /* Pll power down */
 598                 wm8940_write(codec, WM8940_PLLN, (1 << 7));
 599                 return 0;
 600         }
 601
 602         /* Pll is followed by a frequency divide by 4 */
 603         pll_factors(freq_out*4, freq_in);
 604         if (pll_div.k)
 605                 wm8940_write(codec, WM8940_PLLN,
 606                              (pll_div.pre_scale << 4) | pll_div.n | (1 << 6));
 607         else /* No factional component */
 608                 wm8940_write(codec, WM8940_PLLN,
 609                              (pll_div.pre_scale << 4) | pll_div.n);
 610         wm8940_write(codec, WM8940_PLLK1, pll_div.k >> 18);
 611         wm8940_write(codec, WM8940_PLLK2, (pll_div.k >> 9) & 0x1ff);
 612         wm8940_write(codec, WM8940_PLLK3, pll_div.k & 0x1ff);
 613         /* Enable the PLL */
 614         reg = wm8940_read_reg_cache(codec, WM8940_POWER1);
 615         wm8940_write(codec, WM8940_POWER1, reg | 0x020);
 616
 617         /* Run CODEC from PLL instead of MCLK */
 618         reg = wm8940_read_reg_cache(codec, WM8940_CLOCK);
 619         wm8940_write(codec, WM8940_CLOCK, reg | 0x100);
 620
 621         return 0;
 622 }
 623
 624 static int wm8940_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 625                                  int clk_id, unsigned int freq, int dir)
 626 {
 627         struct snd_soc_codec *codec = codec_dai->codec;
 628         struct wm8940_priv *wm8940 = codec->private_data;
 629
 630         switch (freq) {
 631         case 11289600:
 632         case 12000000:
 633         case 12288000:
 634         case 16934400:
 635         case 18432000:
 636                 wm8940->sysclk = freq;
 637                 return 0;
 638         }
 639         return -EINVAL;
 640 }
 641
 642 static int wm8940_set_dai_clkdiv(struct snd_soc_dai *codec_dai,
 643                                  int div_id, int div)
 644 {
 645         struct snd_soc_codec *codec = codec_dai->codec;
 646         u16 reg;
 647         int ret = 0;
 648
 649         switch (div_id) {
 650         case WM8940_BCLKDIV:
 651                 reg = wm8940_read_reg_cache(codec, WM8940_CLOCK) & 0xFFEF3;
 652                 ret = wm8940_write(codec, WM8940_CLOCK, reg | (div << 2));
 653                 break;
 654         case WM8940_MCLKDIV:
 655                 reg = wm8940_read_reg_cache(codec, WM8940_CLOCK) & 0xFF1F;
 656                 ret = wm8940_write(codec, WM8940_CLOCK, reg | (div << 5));
 657                 break;
 658         case WM8940_OPCLKDIV:
 659                 reg = wm8940_read_reg_cache(codec, WM8940_ADDCNTRL) & 0xFFCF;
 660                 ret = wm8940_write(codec, WM8940_ADDCNTRL, reg | (div << 4));
 661                 break;
 662         }
 663         return ret;
 664 }
 665
 666 #define WM8940_RATES SNDRV_PCM_RATE_8000_48000
 667
 668 #define WM8940_FORMATS (SNDRV_PCM_FMTBIT_S8 |                           \
 669                         SNDRV_PCM_FMTBIT_S16_LE |                       \
 670                         SNDRV_PCM_FMTBIT_S20_3LE |                      \
 671                         SNDRV_PCM_FMTBIT_S24_LE |                       \
 672                         SNDRV_PCM_FMTBIT_S32_LE)
 673
 674 static struct snd_soc_dai_ops wm8940_dai_ops = {
 675         .hw_params = wm8940_i2s_hw_params,
 676         .set_sysclk = wm8940_set_dai_sysclk,
 677         .digital_mute = wm8940_mute,
 678         .set_fmt = wm8940_set_dai_fmt,
 679         .set_clkdiv = wm8940_set_dai_clkdiv,
 680         .set_pll = wm8940_set_dai_pll,
 681 };
 682
 683 struct snd_soc_dai wm8940_dai = {
 684         .name = "WM8940",
 685         .playback = {
 686                 .stream_name = "Playback",
 687                 .channels_min = 1,
 688                 .channels_max = 2,
 689                 .rates = WM8940_RATES,
 690                 .formats = WM8940_FORMATS,
 691         },
 692         .capture = {
 693                 .stream_name = "Capture",
 694                 .channels_min = 1,
 695                 .channels_max = 2,
 696                 .rates = WM8940_RATES,
 697                 .formats = WM8940_FORMATS,
 698         },
 699         .ops = &wm8940_dai_ops,
 700         .symmetric_rates = 1,
 701 };
 702 EXPORT_SYMBOL_GPL(wm8940_dai);
 703
 704 static int wm8940_suspend(struct platform_device *pdev, pm_message_t state)
 705 {
 706         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 707         struct snd_soc_codec *codec = socdev->card->codec;
 708
 709         return wm8940_set_bias_level(codec, SND_SOC_BIAS_OFF);
 710 }
 711
 712 static int wm8940_resume(struct platform_device *pdev)
 713 {
 714         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 715         struct snd_soc_codec *codec = socdev->card->codec;
 716         int i;
 717         int ret;
 718         u8 data[3];
 719         u16 *cache = codec->reg_cache;
 720
 721         /* Sync reg_cache with the hardware
 722          * Could use auto incremented writes to speed this up
 723          */
 724         for (i = 0; i < ARRAY_SIZE(wm8940_reg_defaults); i++) {
 725                 data[0] = i;
 726                 data[1] = (cache[i] & 0xFF00) >> 8;
 727                 data[2] = cache[i] & 0x00FF;
 728                 ret = codec->hw_write(codec->control_data, data, 3);
 729                 if (ret < 0)
 730                         goto error_ret;
 731                 else if (ret != 3) {
 732                         ret = -EIO;
 733                         goto error_ret;
 734                 }
 735         }
 736         ret = wm8940_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 737         if (ret)
 738                 goto error_ret;
 739         ret = wm8940_set_bias_level(codec, codec->suspend_bias_level);
 740
 741 error_ret:
 742         return ret;
 743 }
 744
 745 static struct snd_soc_codec *wm8940_codec;
 746
 747 static int wm8940_probe(struct platform_device *pdev)
 748 {
 749         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 750         struct snd_soc_codec *codec;
 751
 752         int ret = 0;
 753
 754         if (wm8940_codec == NULL) {
 755                 dev_err(&pdev->dev, "Codec device not registered\n");
 756                 return -ENODEV;
 757         }
 758
 759         socdev->card->codec = wm8940_codec;
 760         codec = wm8940_codec;
 761
 762         mutex_init(&codec->mutex);
 763         /* register pcms */
 764         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 765         if (ret < 0) {
 766                 dev_err(codec->dev, "failed to create pcms: %d\n", ret);
 767                 goto pcm_err;
 768         }
 769
 770         ret = snd_soc_add_controls(codec, wm8940_snd_controls,
 771                              ARRAY_SIZE(wm8940_snd_controls));
 772         if (ret)
 773                 goto error_free_pcms;
 774         ret = wm8940_add_widgets(codec);
 775         if (ret)
 776                 goto error_free_pcms;
 777
 778         ret = snd_soc_init_card(socdev);
 779         if (ret < 0) {
 780                 dev_err(codec->dev, "failed to register card: %d\n", ret);
 781                 goto error_free_pcms;
 782         }
 783
 784         return ret;
 785
 786 error_free_pcms:
 787         snd_soc_free_pcms(socdev);
 788         snd_soc_dapm_free(socdev);
 789 pcm_err:
 790         return ret;
 791 }
 792
 793 static int wm8940_remove(struct platform_device *pdev)
 794 {
 795         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 796
 797         snd_soc_free_pcms(socdev);
 798         snd_soc_dapm_free(socdev);
 799
 800         return 0;
 801 }
 802
 803 struct snd_soc_codec_device soc_codec_dev_wm8940 = {
 804         .probe = wm8940_probe,
 805         .remove = wm8940_remove,
 806         .suspend = wm8940_suspend,
 807         .resume = wm8940_resume,
 808 };
 809 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8940);
 810
 811 static int wm8940_register(struct wm8940_priv *wm8940)
 812 {
 813         struct wm8940_setup_data *pdata = wm8940->codec.dev->platform_data;
 814         struct snd_soc_codec *codec = &wm8940->codec;
 815         int ret;
 816         u16 reg;
 817         if (wm8940_codec) {
 818                 dev_err(codec->dev, "Another WM8940 is registered\n");
 819                 return -EINVAL;
 820         }
 821
 822         INIT_LIST_HEAD(&codec->dapm_widgets);
 823         INIT_LIST_HEAD(&codec->dapm_paths);
 824
 825         codec->private_data = wm8940;
 826         codec->name = "WM8940";
 827         codec->owner = THIS_MODULE;
 828         codec->read = wm8940_read_reg_cache;
 829         codec->write = wm8940_write;
 830         codec->bias_level = SND_SOC_BIAS_OFF;
 831         codec->set_bias_level = wm8940_set_bias_level;
 832         codec->dai = &wm8940_dai;
 833         codec->num_dai = 1;
 834         codec->reg_cache_size = ARRAY_SIZE(wm8940_reg_defaults);
 835         codec->reg_cache = &wm8940->reg_cache;
 836
 837         memcpy(codec->reg_cache, wm8940_reg_defaults,
 838                sizeof(wm8940_reg_defaults));
 839
 840         ret = wm8940_reset(codec);
 841         if (ret < 0) {
 842                 dev_err(codec->dev, "Failed to issue reset\n");
 843                 return ret;
 844         }
 845
 846         wm8940_dai.dev = codec->dev;
 847
 848         wm8940_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 849
 850         ret = wm8940_write(codec, WM8940_POWER1, 0x180);
 851         if (ret < 0)
 852                 return ret;
 853
 854         if (!pdata)
 855                 dev_warn(codec->dev, "No platform data supplied\n");
 856         else {
 857                 reg = wm8940_read_reg_cache(codec, WM8940_OUTPUTCTL);
 858                 ret = wm8940_write(codec, WM8940_OUTPUTCTL, reg | pdata->vroi);
 859                 if (ret < 0)
 860                         return ret;
 861         }
 862
 863
 864         wm8940_codec = codec;
 865
 866         ret = snd_soc_register_codec(codec);
 867         if (ret) {
 868                 dev_err(codec->dev, "Failed to register codec: %d\n", ret);
 869                 return ret;
 870         }
 871
 872         ret = snd_soc_register_dai(&wm8940_dai);
 873         if (ret) {
 874                 dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
 875                 snd_soc_unregister_codec(codec);
 876                 return ret;
 877         }
 878
 879         return 0;
 880 }
 881
 882 static void wm8940_unregister(struct wm8940_priv *wm8940)
 883 {
 884         wm8940_set_bias_level(&wm8940->codec, SND_SOC_BIAS_OFF);
 885         snd_soc_unregister_dai(&wm8940_dai);
 886         snd_soc_unregister_codec(&wm8940->codec);
 887         kfree(wm8940);
 888         wm8940_codec = NULL;
 889 }
 890
 891 static int wm8940_i2c_probe(struct i2c_client *i2c,
 892                             const struct i2c_device_id *id)
 893 {
 894         struct wm8940_priv *wm8940;
 895         struct snd_soc_codec *codec;
 896
 897         wm8940 = kzalloc(sizeof *wm8940, GFP_KERNEL);
 898         if (wm8940 == NULL)
 899                 return -ENOMEM;
 900
 901         codec = &wm8940->codec;
 902         codec->hw_write = (hw_write_t)i2c_master_send;
 903         i2c_set_clientdata(i2c, wm8940);
 904         codec->control_data = i2c;
 905         codec->dev = &i2c->dev;
 906
 907         return wm8940_register(wm8940);
 908 }
 909
 910 static int __devexit wm8940_i2c_remove(struct i2c_client *client)
 911 {
 912         struct wm8940_priv *wm8940 = i2c_get_clientdata(client);
 913
 914         wm8940_unregister(wm8940);
 915
 916         return 0;
 917 }
 918
 919 static const struct i2c_device_id wm8940_i2c_id[] = {
 920         { "wm8940", 0 },
 921         { }
 922 };
 923 MODULE_DEVICE_TABLE(i2c, wm8940_i2c_id);
 924
 925 static struct i2c_driver wm8940_i2c_driver = {
 926         .driver = {
 927                 .name = "WM8940 I2C Codec",
 928                 .owner = THIS_MODULE,
 929         },
 930         .probe = wm8940_i2c_probe,
 931         .remove = __devexit_p(wm8940_i2c_remove),
 932         .id_table = wm8940_i2c_id,
 933 };
 934
 935 static int __init wm8940_modinit(void)
 936 {
 937         int ret;
 938
 939         ret = i2c_add_driver(&wm8940_i2c_driver);
 940         if (ret)
 941                 printk(KERN_ERR "Failed to register WM8940 I2C driver: %d\n",
 942                        ret);
 943         return ret;
 944 }
 945 module_init(wm8940_modinit);
 946
 947 static void __exit wm8940_exit(void)
 948 {
 949         i2c_del_driver(&wm8940_i2c_driver);
 950 }
 951 module_exit(wm8940_exit);
 952
 953 MODULE_DESCRIPTION("ASoC WM8940 driver");
 954 MODULE_AUTHOR("Jonathan Cameron");
 955 MODULE_LICENSE("GPL");