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/soc-dapm.h>
  39 #include <sound/initval.h>
  40 #include <sound/tlv.h>
  41
  42 #include "wm8940.h"
  43
  44 struct wm8940_priv {
  45         unsigned int sysclk;
  46         u16 reg_cache[WM8940_CACHEREGNUM];
  47         struct snd_soc_codec codec;
  48 };
  49
  50 static u16 wm8940_reg_defaults[] = {
  51         0x8940, /* Soft Reset */
  52         0x0000, /* Power 1 */
  53         0x0000, /* Power 2 */
  54         0x0000, /* Power 3 */
  55         0x0010, /* Interface Control */
  56         0x0000, /* Companding Control */
  57         0x0140, /* Clock Control */
  58         0x0000, /* Additional Controls */
  59         0x0000, /* GPIO Control */
  60         0x0002, /* Auto Increment Control */
  61         0x0000, /* DAC Control */
  62         0x00FF, /* DAC Volume */
  63         0,
  64         0,
  65         0x0100, /* ADC Control */
  66         0x00FF, /* ADC Volume */
  67         0x0000, /* Notch Filter 1 Control 1 */
  68         0x0000, /* Notch Filter 1 Control 2 */
  69         0x0000, /* Notch Filter 2 Control 1 */
  70         0x0000, /* Notch Filter 2 Control 2 */
  71         0x0000, /* Notch Filter 3 Control 1 */
  72         0x0000, /* Notch Filter 3 Control 2 */
  73         0x0000, /* Notch Filter 4 Control 1 */
  74         0x0000, /* Notch Filter 4 Control 2 */
  75         0x0032, /* DAC Limit Control 1 */
  76         0x0000, /* DAC Limit Control 2 */
  77         0,
  78         0,
  79         0,
  80         0,
  81         0,
  82         0,
  83         0x0038, /* ALC Control 1 */
  84         0x000B, /* ALC Control 2 */
  85         0x0032, /* ALC Control 3 */
  86         0x0000, /* Noise Gate */
  87         0x0041, /* PLLN */
  88         0x000C, /* PLLK1 */
  89         0x0093, /* PLLK2 */
  90         0x00E9, /* PLLK3 */
  91         0,
  92         0,
  93         0x0030, /* ALC Control 4 */
  94         0,
  95         0x0002, /* Input Control */
  96         0x0050, /* PGA Gain */
  97         0,
  98         0x0002, /* ADC Boost Control */
  99         0,
 100         0x0002, /* Output Control */
 101         0x0000, /* Speaker Mixer Control */
 102         0,
 103         0,
 104         0,
 105         0x0079, /* Speaker Volume */
 106         0,
 107         0x0000, /* Mono Mixer Control */
 108 };
 109
 110 static const char *wm8940_companding[] = { "Off", "NC", "u-law", "A-law" };
 111 static const struct soc_enum wm8940_adc_companding_enum
 112 = SOC_ENUM_SINGLE(WM8940_COMPANDINGCTL, 1, 4, wm8940_companding);
 113 static const struct soc_enum wm8940_dac_companding_enum
 114 = SOC_ENUM_SINGLE(WM8940_COMPANDINGCTL, 3, 4, wm8940_companding);
 115
 116 static const char *wm8940_alc_mode_text[] = {"ALC", "Limiter"};
 117 static const struct soc_enum wm8940_alc_mode_enum
 118 = SOC_ENUM_SINGLE(WM8940_ALC3, 8, 2, wm8940_alc_mode_text);
 119
 120 static const char *wm8940_mic_bias_level_text[] = {"0.9", "0.65"};
 121 static const struct soc_enum wm8940_mic_bias_level_enum
 122 = SOC_ENUM_SINGLE(WM8940_INPUTCTL, 8, 2, wm8940_mic_bias_level_text);
 123
 124 static const char *wm8940_filter_mode_text[] = {"Audio", "Application"};
 125 static const struct soc_enum wm8940_filter_mode_enum
 126 = SOC_ENUM_SINGLE(WM8940_ADC, 7, 2, wm8940_filter_mode_text);
 127
 128 static DECLARE_TLV_DB_SCALE(wm8940_spk_vol_tlv, -5700, 100, 1);
 129 static DECLARE_TLV_DB_SCALE(wm8940_att_tlv, -1000, 1000, 0);
 130 static DECLARE_TLV_DB_SCALE(wm8940_pga_vol_tlv, -1200, 75, 0);
 131 static DECLARE_TLV_DB_SCALE(wm8940_alc_min_tlv, -1200, 600, 0);
 132 static DECLARE_TLV_DB_SCALE(wm8940_alc_max_tlv, 675, 600, 0);
 133 static DECLARE_TLV_DB_SCALE(wm8940_alc_tar_tlv, -2250, 50, 0);
 134 static DECLARE_TLV_DB_SCALE(wm8940_lim_boost_tlv, 0, 100, 0);
 135 static DECLARE_TLV_DB_SCALE(wm8940_lim_thresh_tlv, -600, 100, 0);
 136 static DECLARE_TLV_DB_SCALE(wm8940_adc_tlv, -12750, 50, 1);
 137 static DECLARE_TLV_DB_SCALE(wm8940_capture_boost_vol_tlv, 0, 2000, 0);
 138
 139 static const struct snd_kcontrol_new wm8940_snd_controls[] = {
 140         SOC_SINGLE("Digital Loopback Switch", WM8940_COMPANDINGCTL,
 141                    6, 1, 0),
 142         SOC_ENUM("DAC Companding", wm8940_dac_companding_enum),
 143         SOC_ENUM("ADC Companding", wm8940_adc_companding_enum),
 144
 145         SOC_ENUM("ALC Mode", wm8940_alc_mode_enum),
 146         SOC_SINGLE("ALC Switch", WM8940_ALC1, 8, 1, 0),
 147         SOC_SINGLE_TLV("ALC Capture Max Gain", WM8940_ALC1,
 148                        3, 7, 1, wm8940_alc_max_tlv),
 149         SOC_SINGLE_TLV("ALC Capture Min Gain", WM8940_ALC1,
 150                        0, 7, 0, wm8940_alc_min_tlv),
 151         SOC_SINGLE_TLV("ALC Capture Target", WM8940_ALC2,
 152                        0, 14, 0, wm8940_alc_tar_tlv),
 153         SOC_SINGLE("ALC Capture Hold", WM8940_ALC2, 4, 10, 0),
 154         SOC_SINGLE("ALC Capture Decay", WM8940_ALC3, 4, 10, 0),
 155         SOC_SINGLE("ALC Capture Attach", WM8940_ALC3, 0, 10, 0),
 156         SOC_SINGLE("ALC ZC Switch", WM8940_ALC4, 1, 1, 0),
 157         SOC_SINGLE("ALC Capture Noise Gate Switch", WM8940_NOISEGATE,
 158                    3, 1, 0),
 159         SOC_SINGLE("ALC Capture Noise Gate Threshold", WM8940_NOISEGATE,
 160                    0, 7, 0),
 161
 162         SOC_SINGLE("DAC Playback Limiter Switch", WM8940_DACLIM1, 8, 1, 0),
 163         SOC_SINGLE("DAC Playback Limiter Attack", WM8940_DACLIM1, 0, 9, 0),
 164         SOC_SINGLE("DAC Playback Limiter Decay", WM8940_DACLIM1, 4, 11, 0),
 165         SOC_SINGLE_TLV("DAC Playback Limiter Threshold", WM8940_DACLIM2,
 166                        4, 9, 1, wm8940_lim_thresh_tlv),
 167         SOC_SINGLE_TLV("DAC Playback Limiter Boost", WM8940_DACLIM2,
 168                        0, 12, 0, wm8940_lim_boost_tlv),
 169
 170         SOC_SINGLE("Capture PGA ZC Switch", WM8940_PGAGAIN, 7, 1, 0),
 171         SOC_SINGLE_TLV("Capture PGA Volume", WM8940_PGAGAIN,
 172                        0, 63, 0, wm8940_pga_vol_tlv),
 173         SOC_SINGLE_TLV("Digital Playback Volume", WM8940_DACVOL,
 174                        0, 255, 0, wm8940_adc_tlv),
 175         SOC_SINGLE_TLV("Digital Capture Volume", WM8940_ADCVOL,
 176                        0, 255, 0, wm8940_adc_tlv),
 177         SOC_ENUM("Mic Bias Level", wm8940_mic_bias_level_enum),
 178         SOC_SINGLE_TLV("Capture Boost Volue", WM8940_ADCBOOST,
 179                        8, 1, 0, wm8940_capture_boost_vol_tlv),
 180         SOC_SINGLE_TLV("Speaker Playback Volume", WM8940_SPKVOL,
 181                        0, 63, 0, wm8940_spk_vol_tlv),
 182         SOC_SINGLE("Speaker Playback Switch", WM8940_SPKVOL,  6, 1, 1),
 183
 184         SOC_SINGLE_TLV("Speaker Mixer Line Bypass Volume", WM8940_SPKVOL,
 185                        8, 1, 1, wm8940_att_tlv),
 186         SOC_SINGLE("Speaker Playback ZC Switch", WM8940_SPKVOL, 7, 1, 0),
 187
 188         SOC_SINGLE("Mono Out Switch", WM8940_MONOMIX, 6, 1, 1),
 189         SOC_SINGLE_TLV("Mono Mixer Line Bypass Volume", WM8940_MONOMIX,
 190                        7, 1, 1, wm8940_att_tlv),
 191
 192         SOC_SINGLE("High Pass Filter Switch", WM8940_ADC, 8, 1, 0),
 193         SOC_ENUM("High Pass Filter Mode", wm8940_filter_mode_enum),
 194         SOC_SINGLE("High Pass Filter Cut Off", WM8940_ADC, 4, 7, 0),
 195         SOC_SINGLE("ADC Inversion Switch", WM8940_ADC, 0, 1, 0),
 196         SOC_SINGLE("DAC Inversion Switch", WM8940_DAC, 0, 1, 0),
 197         SOC_SINGLE("DAC Auto Mute Switch", WM8940_DAC, 2, 1, 0),
 198         SOC_SINGLE("ZC Timeout Clock Switch", WM8940_ADDCNTRL, 0, 1, 0),
 199 };
 200
 201 static const struct snd_kcontrol_new wm8940_speaker_mixer_controls[] = {
 202         SOC_DAPM_SINGLE("Line Bypass Switch", WM8940_SPKMIX, 1, 1, 0),
 203         SOC_DAPM_SINGLE("Aux Playback Switch", WM8940_SPKMIX, 5, 1, 0),
 204         SOC_DAPM_SINGLE("PCM Playback Switch", WM8940_SPKMIX, 0, 1, 0),
 205 };
 206
 207 static const struct snd_kcontrol_new wm8940_mono_mixer_controls[] = {
 208         SOC_DAPM_SINGLE("Line Bypass Switch", WM8940_MONOMIX, 1, 1, 0),
 209         SOC_DAPM_SINGLE("Aux Playback Switch", WM8940_MONOMIX, 2, 1, 0),
 210         SOC_DAPM_SINGLE("PCM Playback Switch", WM8940_MONOMIX, 0, 1, 0),
 211 };
 212
 213 static DECLARE_TLV_DB_SCALE(wm8940_boost_vol_tlv, -1500, 300, 1);
 214 static const struct snd_kcontrol_new wm8940_input_boost_controls[] = {
 215         SOC_DAPM_SINGLE("Mic PGA Switch", WM8940_PGAGAIN, 6, 1, 1),
 216         SOC_DAPM_SINGLE_TLV("Aux Volume", WM8940_ADCBOOST,
 217                             0, 7, 0, wm8940_boost_vol_tlv),
 218         SOC_DAPM_SINGLE_TLV("Mic Volume", WM8940_ADCBOOST,
 219                             4, 7, 0, wm8940_boost_vol_tlv),
 220 };
 221
 222 static const struct snd_kcontrol_new wm8940_micpga_controls[] = {
 223         SOC_DAPM_SINGLE("AUX Switch", WM8940_INPUTCTL, 2, 1, 0),
 224         SOC_DAPM_SINGLE("MICP Switch", WM8940_INPUTCTL, 0, 1, 0),
 225         SOC_DAPM_SINGLE("MICN Switch", WM8940_INPUTCTL, 1, 1, 0),
 226 };
 227
 228 static const struct snd_soc_dapm_widget wm8940_dapm_widgets[] = {
 229         SND_SOC_DAPM_MIXER("Speaker Mixer", WM8940_POWER3, 2, 0,
 230                            &wm8940_speaker_mixer_controls[0],
 231                            ARRAY_SIZE(wm8940_speaker_mixer_controls)),
 232         SND_SOC_DAPM_MIXER("Mono Mixer", WM8940_POWER3, 3, 0,
 233                            &wm8940_mono_mixer_controls[0],
 234                            ARRAY_SIZE(wm8940_mono_mixer_controls)),
 235         SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8940_POWER3, 0, 0),
 236
 237         SND_SOC_DAPM_PGA("SpkN Out", WM8940_POWER3, 5, 0, NULL, 0),
 238         SND_SOC_DAPM_PGA("SpkP Out", WM8940_POWER3, 6, 0, NULL, 0),
 239         SND_SOC_DAPM_PGA("Mono Out", WM8940_POWER3, 7, 0, NULL, 0),
 240         SND_SOC_DAPM_OUTPUT("MONOOUT"),
 241         SND_SOC_DAPM_OUTPUT("SPKOUTP"),
 242         SND_SOC_DAPM_OUTPUT("SPKOUTN"),
 243
 244         SND_SOC_DAPM_PGA("Aux Input", WM8940_POWER1, 6, 0, NULL, 0),
 245         SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8940_POWER2, 0, 0),
 246         SND_SOC_DAPM_MIXER("Mic PGA", WM8940_POWER2, 2, 0,
 247                            &wm8940_micpga_controls[0],
 248                            ARRAY_SIZE(wm8940_micpga_controls)),
 249         SND_SOC_DAPM_MIXER("Boost Mixer", WM8940_POWER2, 4, 0,
 250                            &wm8940_input_boost_controls[0],
 251                            ARRAY_SIZE(wm8940_input_boost_controls)),
 252         SND_SOC_DAPM_MICBIAS("Mic Bias", WM8940_POWER1, 4, 0),
 253
 254         SND_SOC_DAPM_INPUT("MICN"),
 255         SND_SOC_DAPM_INPUT("MICP"),
 256         SND_SOC_DAPM_INPUT("AUX"),
 257 };
 258
 259 static const struct snd_soc_dapm_route audio_map[] = {
 260         /* Mono output mixer */
 261         {"Mono Mixer", "PCM Playback Switch", "DAC"},
 262         {"Mono Mixer", "Aux Playback Switch", "Aux Input"},
 263         {"Mono Mixer", "Line Bypass Switch", "Boost Mixer"},
 264
 265         /* Speaker output mixer */
 266         {"Speaker Mixer", "PCM Playback Switch", "DAC"},
 267         {"Speaker Mixer", "Aux Playback Switch", "Aux Input"},
 268         {"Speaker Mixer", "Line Bypass Switch", "Boost Mixer"},
 269
 270         /* Outputs */
 271         {"Mono Out", NULL, "Mono Mixer"},
 272         {"MONOOUT", NULL, "Mono Out"},
 273         {"SpkN Out", NULL, "Speaker Mixer"},
 274         {"SpkP Out", NULL, "Speaker Mixer"},
 275         {"SPKOUTN", NULL, "SpkN Out"},
 276         {"SPKOUTP", NULL, "SpkP Out"},
 277
 278         /*  Microphone PGA */
 279         {"Mic PGA", "MICN Switch", "MICN"},
 280         {"Mic PGA", "MICP Switch", "MICP"},
 281         {"Mic PGA", "AUX Switch", "AUX"},
 282
 283         /* Boost Mixer */
 284         {"Boost Mixer", "Mic PGA Switch", "Mic PGA"},
 285         {"Boost Mixer", "Mic Volume",  "MICP"},
 286         {"Boost Mixer", "Aux Volume", "Aux Input"},
 287
 288         {"ADC", NULL, "Boost Mixer"},
 289 };
 290
 291 static int wm8940_add_widgets(struct snd_soc_codec *codec)
 292 {
 293         int ret;
 294
 295         ret = snd_soc_dapm_new_controls(codec, wm8940_dapm_widgets,
 296                                         ARRAY_SIZE(wm8940_dapm_widgets));
 297         if (ret)
 298                 goto error_ret;
 299         ret = snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));
 300         if (ret)
 301                 goto error_ret;
 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 8000:
 383                 addcntrl |= (0x5 << 1);
 384                 break;
 385         case 11025:
 386                 addcntrl |= (0x4 << 1);
 387                 break;
 388         case 16000:
 389                 addcntrl |= (0x3 << 1);
 390                 break;
 391         case 22050:
 392                 addcntrl |= (0x2 << 1);
 393                 break;
 394         case 32000:
 395                 addcntrl |= (0x1 << 1);
 396                 break;
 397         case 44100:
 398         case 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, int pll_id,
 540                 int source, 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 = snd_soc_codec_get_drvdata(codec);
 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
 696 error_ret:
 697         return ret;
 698 }
 699
 700 static struct snd_soc_codec *wm8940_codec;
 701
 702 static int wm8940_probe(struct platform_device *pdev)
 703 {
 704         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 705         struct snd_soc_codec *codec;
 706
 707         int ret = 0;
 708
 709         if (wm8940_codec == NULL) {
 710                 dev_err(&pdev->dev, "Codec device not registered\n");
 711                 return -ENODEV;
 712         }
 713
 714         socdev->card->codec = wm8940_codec;
 715         codec = wm8940_codec;
 716
 717         mutex_init(&codec->mutex);
 718         /* register pcms */
 719         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 720         if (ret < 0) {
 721                 dev_err(codec->dev, "failed to create pcms: %d\n", ret);
 722                 goto pcm_err;
 723         }
 724
 725         ret = snd_soc_add_controls(codec, wm8940_snd_controls,
 726                              ARRAY_SIZE(wm8940_snd_controls));
 727         if (ret)
 728                 goto error_free_pcms;
 729         ret = wm8940_add_widgets(codec);
 730         if (ret)
 731                 goto error_free_pcms;
 732
 733         return ret;
 734
 735 error_free_pcms:
 736         snd_soc_free_pcms(socdev);
 737         snd_soc_dapm_free(socdev);
 738 pcm_err:
 739         return ret;
 740 }
 741
 742 static int wm8940_remove(struct platform_device *pdev)
 743 {
 744         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 745
 746         snd_soc_free_pcms(socdev);
 747         snd_soc_dapm_free(socdev);
 748
 749         return 0;
 750 }
 751
 752 struct snd_soc_codec_device soc_codec_dev_wm8940 = {
 753         .probe = wm8940_probe,
 754         .remove = wm8940_remove,
 755         .suspend = wm8940_suspend,
 756         .resume = wm8940_resume,
 757 };
 758 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8940);
 759
 760 static int wm8940_register(struct wm8940_priv *wm8940,
 761                            enum snd_soc_control_type control)
 762 {
 763         struct wm8940_setup_data *pdata = wm8940->codec.dev->platform_data;
 764         struct snd_soc_codec *codec = &wm8940->codec;
 765         int ret;
 766         u16 reg;
 767         if (wm8940_codec) {
 768                 dev_err(codec->dev, "Another WM8940 is registered\n");
 769                 return -EINVAL;
 770         }
 771
 772         INIT_LIST_HEAD(&codec->dapm_widgets);
 773         INIT_LIST_HEAD(&codec->dapm_paths);
 774
 775         snd_soc_codec_set_drvdata(codec, wm8940);
 776         codec->name = "WM8940";
 777         codec->owner = THIS_MODULE;
 778         codec->bias_level = SND_SOC_BIAS_OFF;
 779         codec->set_bias_level = wm8940_set_bias_level;
 780         codec->dai = &wm8940_dai;
 781         codec->num_dai = 1;
 782         codec->reg_cache_size = ARRAY_SIZE(wm8940_reg_defaults);
 783         codec->reg_cache = &wm8940->reg_cache;
 784
 785         ret = snd_soc_codec_set_cache_io(codec, 8, 16, control);
 786         if (ret < 0) {
 787                 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
 788                 return ret;
 789         }
 790
 791         memcpy(codec->reg_cache, wm8940_reg_defaults,
 792                sizeof(wm8940_reg_defaults));
 793
 794         ret = wm8940_reset(codec);
 795         if (ret < 0) {
 796                 dev_err(codec->dev, "Failed to issue reset\n");
 797                 return ret;
 798         }
 799
 800         wm8940_dai.dev = codec->dev;
 801
 802         wm8940_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 803
 804         ret = snd_soc_write(codec, WM8940_POWER1, 0x180);
 805         if (ret < 0)
 806                 return ret;
 807
 808         if (!pdata)
 809                 dev_warn(codec->dev, "No platform data supplied\n");
 810         else {
 811                 reg = snd_soc_read(codec, WM8940_OUTPUTCTL);
 812                 ret = snd_soc_write(codec, WM8940_OUTPUTCTL, reg | pdata->vroi);
 813                 if (ret < 0)
 814                         return ret;
 815         }
 816
 817
 818         wm8940_codec = codec;
 819
 820         ret = snd_soc_register_codec(codec);
 821         if (ret) {
 822                 dev_err(codec->dev, "Failed to register codec: %d\n", ret);
 823                 return ret;
 824         }
 825
 826         ret = snd_soc_register_dai(&wm8940_dai);
 827         if (ret) {
 828                 dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
 829                 snd_soc_unregister_codec(codec);
 830                 return ret;
 831         }
 832
 833         return 0;
 834 }
 835
 836 static void wm8940_unregister(struct wm8940_priv *wm8940)
 837 {
 838         wm8940_set_bias_level(&wm8940->codec, SND_SOC_BIAS_OFF);
 839         snd_soc_unregister_dai(&wm8940_dai);
 840         snd_soc_unregister_codec(&wm8940->codec);
 841         kfree(wm8940);
 842         wm8940_codec = NULL;
 843 }
 844
 845 static int wm8940_i2c_probe(struct i2c_client *i2c,
 846                             const struct i2c_device_id *id)
 847 {
 848         struct wm8940_priv *wm8940;
 849         struct snd_soc_codec *codec;
 850
 851         wm8940 = kzalloc(sizeof *wm8940, GFP_KERNEL);
 852         if (wm8940 == NULL)
 853                 return -ENOMEM;
 854
 855         codec = &wm8940->codec;
 856         codec->hw_write = (hw_write_t)i2c_master_send;
 857         i2c_set_clientdata(i2c, wm8940);
 858         codec->control_data = i2c;
 859         codec->dev = &i2c->dev;
 860
 861         return wm8940_register(wm8940, SND_SOC_I2C);
 862 }
 863
 864 static int __devexit wm8940_i2c_remove(struct i2c_client *client)
 865 {
 866         struct wm8940_priv *wm8940 = i2c_get_clientdata(client);
 867
 868         wm8940_unregister(wm8940);
 869
 870         return 0;
 871 }
 872
 873 static const struct i2c_device_id wm8940_i2c_id[] = {
 874         { "wm8940", 0 },
 875         { }
 876 };
 877 MODULE_DEVICE_TABLE(i2c, wm8940_i2c_id);
 878
 879 static struct i2c_driver wm8940_i2c_driver = {
 880         .driver = {
 881                 .name = "WM8940 I2C Codec",
 882                 .owner = THIS_MODULE,
 883         },
 884         .probe = wm8940_i2c_probe,
 885         .remove = __devexit_p(wm8940_i2c_remove),
 886         .id_table = wm8940_i2c_id,
 887 };
 888
 889 static int __init wm8940_modinit(void)
 890 {
 891         int ret;
 892
 893         ret = i2c_add_driver(&wm8940_i2c_driver);
 894         if (ret)
 895                 printk(KERN_ERR "Failed to register WM8940 I2C driver: %d\n",
 896                        ret);
 897         return ret;
 898 }
 899 module_init(wm8940_modinit);
 900
 901 static void __exit wm8940_exit(void)
 902 {
 903         i2c_del_driver(&wm8940_i2c_driver);
 904 }
 905 module_exit(wm8940_exit);
 906
 907 MODULE_DESCRIPTION("ASoC WM8940 driver");
 908 MODULE_AUTHOR("Jonathan Cameron");
 909 MODULE_LICENSE("GPL");