sound/soc/codecs/wm8988.c

   1 /*
   2  * wm8988.c -- WM8988 ALSA SoC audio driver
   3  *
   4  * Copyright 2009 Wolfson Microelectronics plc
   5  * Copyright 2005 Openedhand Ltd.
   6  *
   7  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/moduleparam.h>
  16 #include <linux/init.h>
  17 #include <linux/delay.h>
  18 #include <linux/pm.h>
  19 #include <linux/i2c.h>
  20 #include <linux/spi/spi.h>
  21 #include <linux/platform_device.h>
  22 #include <sound/core.h>
  23 #include <sound/pcm.h>
  24 #include <sound/pcm_params.h>
  25 #include <sound/tlv.h>
  26 #include <sound/soc.h>
  27 #include <sound/soc-dapm.h>
  28 #include <sound/initval.h>
  29
  30 #include "wm8988.h"
  31
  32 /*
  33  * wm8988 register cache
  34  * We can't read the WM8988 register space when we
  35  * are using 2 wire for device control, so we cache them instead.
  36  */
  37 static const u16 wm8988_reg[] = {
  38         0x0097, 0x0097, 0x0079, 0x0079,  /*  0 */
  39         0x0000, 0x0008, 0x0000, 0x000a,  /*  4 */
  40         0x0000, 0x0000, 0x00ff, 0x00ff,  /*  8 */
  41         0x000f, 0x000f, 0x0000, 0x0000,  /* 12 */
  42         0x0000, 0x007b, 0x0000, 0x0032,  /* 16 */
  43         0x0000, 0x00c3, 0x00c3, 0x00c0,  /* 20 */
  44         0x0000, 0x0000, 0x0000, 0x0000,  /* 24 */
  45         0x0000, 0x0000, 0x0000, 0x0000,  /* 28 */
  46         0x0000, 0x0000, 0x0050, 0x0050,  /* 32 */
  47         0x0050, 0x0050, 0x0050, 0x0050,  /* 36 */
  48         0x0079, 0x0079, 0x0079,          /* 40 */
  49 };
  50
  51 /* codec private data */
  52 struct wm8988_priv {
  53         unsigned int sysclk;
  54         struct snd_soc_codec codec;
  55         struct snd_pcm_hw_constraint_list *sysclk_constraints;
  56         u16 reg_cache[WM8988_NUM_REG];
  57 };
  58
  59
  60 /*
  61  * read wm8988 register cache
  62  */
  63 static inline unsigned int wm8988_read_reg_cache(struct snd_soc_codec *codec,
  64         unsigned int reg)
  65 {
  66         u16 *cache = codec->reg_cache;
  67         if (reg > WM8988_NUM_REG)
  68                 return -1;
  69         return cache[reg];
  70 }
  71
  72 /*
  73  * write wm8988 register cache
  74  */
  75 static inline void wm8988_write_reg_cache(struct snd_soc_codec *codec,
  76         unsigned int reg, unsigned int value)
  77 {
  78         u16 *cache = codec->reg_cache;
  79         if (reg > WM8988_NUM_REG)
  80                 return;
  81         cache[reg] = value;
  82 }
  83
  84 static int wm8988_write(struct snd_soc_codec *codec, unsigned int reg,
  85         unsigned int value)
  86 {
  87         u8 data[2];
  88
  89         /* data is
  90          *   D15..D9 WM8753 register offset
  91          *   D8...D0 register data
  92          */
  93         data[0] = (reg << 1) | ((value >> 8) & 0x0001);
  94         data[1] = value & 0x00ff;
  95
  96         wm8988_write_reg_cache(codec, reg, value);
  97         if (codec->hw_write(codec->control_data, data, 2) == 2)
  98                 return 0;
  99         else
 100                 return -EIO;
 101 }
 102
 103 #define wm8988_reset(c) wm8988_write(c, WM8988_RESET, 0)
 104
 105 /*
 106  * WM8988 Controls
 107  */
 108
 109 static const char *bass_boost_txt[] = {"Linear Control", "Adaptive Boost"};
 110 static const struct soc_enum bass_boost =
 111         SOC_ENUM_SINGLE(WM8988_BASS, 7, 2, bass_boost_txt);
 112
 113 static const char *bass_filter_txt[] = { "130Hz @ 48kHz", "200Hz @ 48kHz" };
 114 static const struct soc_enum bass_filter =
 115         SOC_ENUM_SINGLE(WM8988_BASS, 6, 2, bass_filter_txt);
 116
 117 static const char *treble_txt[] = {"8kHz", "4kHz"};
 118 static const struct soc_enum treble =
 119         SOC_ENUM_SINGLE(WM8988_TREBLE, 6, 2, treble_txt);
 120
 121 static const char *stereo_3d_lc_txt[] = {"200Hz", "500Hz"};
 122 static const struct soc_enum stereo_3d_lc =
 123         SOC_ENUM_SINGLE(WM8988_3D, 5, 2, stereo_3d_lc_txt);
 124
 125 static const char *stereo_3d_uc_txt[] = {"2.2kHz", "1.5kHz"};
 126 static const struct soc_enum stereo_3d_uc =
 127         SOC_ENUM_SINGLE(WM8988_3D, 6, 2, stereo_3d_uc_txt);
 128
 129 static const char *stereo_3d_func_txt[] = {"Capture", "Playback"};
 130 static const struct soc_enum stereo_3d_func =
 131         SOC_ENUM_SINGLE(WM8988_3D, 7, 2, stereo_3d_func_txt);
 132
 133 static const char *alc_func_txt[] = {"Off", "Right", "Left", "Stereo"};
 134 static const struct soc_enum alc_func =
 135         SOC_ENUM_SINGLE(WM8988_ALC1, 7, 4, alc_func_txt);
 136
 137 static const char *ng_type_txt[] = {"Constant PGA Gain",
 138                                     "Mute ADC Output"};
 139 static const struct soc_enum ng_type =
 140         SOC_ENUM_SINGLE(WM8988_NGATE, 1, 2, ng_type_txt);
 141
 142 static const char *deemph_txt[] = {"None", "32Khz", "44.1Khz", "48Khz"};
 143 static const struct soc_enum deemph =
 144         SOC_ENUM_SINGLE(WM8988_ADCDAC, 1, 4, deemph_txt);
 145
 146 static const char *adcpol_txt[] = {"Normal", "L Invert", "R Invert",
 147                                    "L + R Invert"};
 148 static const struct soc_enum adcpol =
 149         SOC_ENUM_SINGLE(WM8988_ADCDAC, 5, 4, adcpol_txt);
 150
 151 static const DECLARE_TLV_DB_SCALE(pga_tlv, -1725, 75, 0);
 152 static const DECLARE_TLV_DB_SCALE(adc_tlv, -9750, 50, 1);
 153 static const DECLARE_TLV_DB_SCALE(dac_tlv, -12750, 50, 1);
 154 static const DECLARE_TLV_DB_SCALE(out_tlv, -12100, 100, 1);
 155 static const DECLARE_TLV_DB_SCALE(bypass_tlv, -1500, 300, 0);
 156
 157 static const struct snd_kcontrol_new wm8988_snd_controls[] = {
 158
 159 SOC_ENUM("Bass Boost", bass_boost),
 160 SOC_ENUM("Bass Filter", bass_filter),
 161 SOC_SINGLE("Bass Volume", WM8988_BASS, 0, 15, 1),
 162
 163 SOC_SINGLE("Treble Volume", WM8988_TREBLE, 0, 15, 0),
 164 SOC_ENUM("Treble Cut-off", treble),
 165
 166 SOC_SINGLE("3D Switch", WM8988_3D, 0, 1, 0),
 167 SOC_SINGLE("3D Volume", WM8988_3D, 1, 15, 0),
 168 SOC_ENUM("3D Lower Cut-off", stereo_3d_lc),
 169 SOC_ENUM("3D Upper Cut-off", stereo_3d_uc),
 170 SOC_ENUM("3D Mode", stereo_3d_func),
 171
 172 SOC_SINGLE("ALC Capture Target Volume", WM8988_ALC1, 0, 7, 0),
 173 SOC_SINGLE("ALC Capture Max Volume", WM8988_ALC1, 4, 7, 0),
 174 SOC_ENUM("ALC Capture Function", alc_func),
 175 SOC_SINGLE("ALC Capture ZC Switch", WM8988_ALC2, 7, 1, 0),
 176 SOC_SINGLE("ALC Capture Hold Time", WM8988_ALC2, 0, 15, 0),
 177 SOC_SINGLE("ALC Capture Decay Time", WM8988_ALC3, 4, 15, 0),
 178 SOC_SINGLE("ALC Capture Attack Time", WM8988_ALC3, 0, 15, 0),
 179 SOC_SINGLE("ALC Capture NG Threshold", WM8988_NGATE, 3, 31, 0),
 180 SOC_ENUM("ALC Capture NG Type", ng_type),
 181 SOC_SINGLE("ALC Capture NG Switch", WM8988_NGATE, 0, 1, 0),
 182
 183 SOC_SINGLE("ZC Timeout Switch", WM8988_ADCTL1, 0, 1, 0),
 184
 185 SOC_DOUBLE_R_TLV("Capture Digital Volume", WM8988_LADC, WM8988_RADC,
 186                  0, 255, 0, adc_tlv),
 187 SOC_DOUBLE_R_TLV("Capture Volume", WM8988_LINVOL, WM8988_RINVOL,
 188                  0, 63, 0, pga_tlv),
 189 SOC_DOUBLE_R("Capture ZC Switch", WM8988_LINVOL, WM8988_RINVOL, 6, 1, 0),
 190 SOC_DOUBLE_R("Capture Switch", WM8988_LINVOL, WM8988_RINVOL, 7, 1, 1),
 191
 192 SOC_ENUM("Playback De-emphasis", deemph),
 193
 194 SOC_ENUM("Capture Polarity", adcpol),
 195 SOC_SINGLE("Playback 6dB Attenuate", WM8988_ADCDAC, 7, 1, 0),
 196 SOC_SINGLE("Capture 6dB Attenuate", WM8988_ADCDAC, 8, 1, 0),
 197
 198 SOC_DOUBLE_R_TLV("PCM Volume", WM8988_LDAC, WM8988_RDAC, 0, 255, 0, dac_tlv),
 199
 200 SOC_SINGLE_TLV("Left Mixer Left Bypass Volume", WM8988_LOUTM1, 4, 7, 1,
 201                bypass_tlv),
 202 SOC_SINGLE_TLV("Left Mixer Right Bypass Volume", WM8988_LOUTM2, 4, 7, 1,
 203                bypass_tlv),
 204 SOC_SINGLE_TLV("Right Mixer Left Bypass Volume", WM8988_ROUTM1, 4, 7, 1,
 205                bypass_tlv),
 206 SOC_SINGLE_TLV("Right Mixer Right Bypass Volume", WM8988_ROUTM2, 4, 7, 1,
 207                bypass_tlv),
 208
 209 SOC_DOUBLE_R("Output 1 Playback ZC Switch", WM8988_LOUT1V,
 210              WM8988_ROUT1V, 7, 1, 0),
 211 SOC_DOUBLE_R_TLV("Output 1 Playback Volume", WM8988_LOUT1V, WM8988_ROUT1V,
 212                  0, 127, 0, out_tlv),
 213
 214 SOC_DOUBLE_R("Output 2 Playback ZC Switch", WM8988_LOUT2V,
 215              WM8988_ROUT2V, 7, 1, 0),
 216 SOC_DOUBLE_R_TLV("Output 2 Playback Volume", WM8988_LOUT2V, WM8988_ROUT2V,
 217                  0, 127, 0, out_tlv),
 218
 219 };
 220
 221 /*
 222  * DAPM Controls
 223  */
 224
 225 static int wm8988_lrc_control(struct snd_soc_dapm_widget *w,
 226                               struct snd_kcontrol *kcontrol, int event)
 227 {
 228         struct snd_soc_codec *codec = w->codec;
 229         u16 adctl2 = wm8988_read_reg_cache(codec, WM8988_ADCTL2);
 230
 231         /* Use the DAC to gate LRC if active, otherwise use ADC */
 232         if (wm8988_read_reg_cache(codec, WM8988_PWR2) & 0x180)
 233                 adctl2 &= ~0x4;
 234         else
 235                 adctl2 |= 0x4;
 236
 237         return wm8988_write(codec, WM8988_ADCTL2, adctl2);
 238 }
 239
 240 static const char *wm8988_line_texts[] = {
 241         "Line 1", "Line 2", "PGA", "Differential"};
 242
 243 static const unsigned int wm8988_line_values[] = {
 244         0, 1, 3, 4};
 245
 246 static const struct soc_enum wm8988_lline_enum =
 247         SOC_VALUE_ENUM_SINGLE(WM8988_LOUTM1, 0, 7,
 248                               ARRAY_SIZE(wm8988_line_texts),
 249                               wm8988_line_texts,
 250                               wm8988_line_values);
 251 static const struct snd_kcontrol_new wm8988_left_line_controls =
 252         SOC_DAPM_VALUE_ENUM("Route", wm8988_lline_enum);
 253
 254 static const struct soc_enum wm8988_rline_enum =
 255         SOC_VALUE_ENUM_SINGLE(WM8988_ROUTM1, 0, 7,
 256                               ARRAY_SIZE(wm8988_line_texts),
 257                               wm8988_line_texts,
 258                               wm8988_line_values);
 259 static const struct snd_kcontrol_new wm8988_right_line_controls =
 260         SOC_DAPM_VALUE_ENUM("Route", wm8988_lline_enum);
 261
 262 /* Left Mixer */
 263 static const struct snd_kcontrol_new wm8988_left_mixer_controls[] = {
 264         SOC_DAPM_SINGLE("Playback Switch", WM8988_LOUTM1, 8, 1, 0),
 265         SOC_DAPM_SINGLE("Left Bypass Switch", WM8988_LOUTM1, 7, 1, 0),
 266         SOC_DAPM_SINGLE("Right Playback Switch", WM8988_LOUTM2, 8, 1, 0),
 267         SOC_DAPM_SINGLE("Right Bypass Switch", WM8988_LOUTM2, 7, 1, 0),
 268 };
 269
 270 /* Right Mixer */
 271 static const struct snd_kcontrol_new wm8988_right_mixer_controls[] = {
 272         SOC_DAPM_SINGLE("Left Playback Switch", WM8988_ROUTM1, 8, 1, 0),
 273         SOC_DAPM_SINGLE("Left Bypass Switch", WM8988_ROUTM1, 7, 1, 0),
 274         SOC_DAPM_SINGLE("Playback Switch", WM8988_ROUTM2, 8, 1, 0),
 275         SOC_DAPM_SINGLE("Right Bypass Switch", WM8988_ROUTM2, 7, 1, 0),
 276 };
 277
 278 static const char *wm8988_pga_sel[] = {"Line 1", "Line 2", "Differential"};
 279 static const unsigned int wm8988_pga_val[] = { 0, 1, 3 };
 280
 281 /* Left PGA Mux */
 282 static const struct soc_enum wm8988_lpga_enum =
 283         SOC_VALUE_ENUM_SINGLE(WM8988_LADCIN, 6, 3,
 284                               ARRAY_SIZE(wm8988_pga_sel),
 285                               wm8988_pga_sel,
 286                               wm8988_pga_val);
 287 static const struct snd_kcontrol_new wm8988_left_pga_controls =
 288         SOC_DAPM_VALUE_ENUM("Route", wm8988_lpga_enum);
 289
 290 /* Right PGA Mux */
 291 static const struct soc_enum wm8988_rpga_enum =
 292         SOC_VALUE_ENUM_SINGLE(WM8988_RADCIN, 6, 3,
 293                               ARRAY_SIZE(wm8988_pga_sel),
 294                               wm8988_pga_sel,
 295                               wm8988_pga_val);
 296 static const struct snd_kcontrol_new wm8988_right_pga_controls =
 297         SOC_DAPM_VALUE_ENUM("Route", wm8988_rpga_enum);
 298
 299 /* Differential Mux */
 300 static const char *wm8988_diff_sel[] = {"Line 1", "Line 2"};
 301 static const struct soc_enum diffmux =
 302         SOC_ENUM_SINGLE(WM8988_ADCIN, 8, 2, wm8988_diff_sel);
 303 static const struct snd_kcontrol_new wm8988_diffmux_controls =
 304         SOC_DAPM_ENUM("Route", diffmux);
 305
 306 /* Mono ADC Mux */
 307 static const char *wm8988_mono_mux[] = {"Stereo", "Mono (Left)",
 308         "Mono (Right)", "Digital Mono"};
 309 static const struct soc_enum monomux =
 310         SOC_ENUM_SINGLE(WM8988_ADCIN, 6, 4, wm8988_mono_mux);
 311 static const struct snd_kcontrol_new wm8988_monomux_controls =
 312         SOC_DAPM_ENUM("Route", monomux);
 313
 314 static const struct snd_soc_dapm_widget wm8988_dapm_widgets[] = {
 315         SND_SOC_DAPM_MICBIAS("Mic Bias", WM8988_PWR1, 1, 0),
 316
 317         SND_SOC_DAPM_MUX("Differential Mux", SND_SOC_NOPM, 0, 0,
 318                 &wm8988_diffmux_controls),
 319         SND_SOC_DAPM_MUX("Left ADC Mux", SND_SOC_NOPM, 0, 0,
 320                 &wm8988_monomux_controls),
 321         SND_SOC_DAPM_MUX("Right ADC Mux", SND_SOC_NOPM, 0, 0,
 322                 &wm8988_monomux_controls),
 323
 324         SND_SOC_DAPM_MUX("Left PGA Mux", WM8988_PWR1, 5, 0,
 325                 &wm8988_left_pga_controls),
 326         SND_SOC_DAPM_MUX("Right PGA Mux", WM8988_PWR1, 4, 0,
 327                 &wm8988_right_pga_controls),
 328
 329         SND_SOC_DAPM_MUX("Left Line Mux", SND_SOC_NOPM, 0, 0,
 330                 &wm8988_left_line_controls),
 331         SND_SOC_DAPM_MUX("Right Line Mux", SND_SOC_NOPM, 0, 0,
 332                 &wm8988_right_line_controls),
 333
 334         SND_SOC_DAPM_ADC("Right ADC", "Right Capture", WM8988_PWR1, 2, 0),
 335         SND_SOC_DAPM_ADC("Left ADC", "Left Capture", WM8988_PWR1, 3, 0),
 336
 337         SND_SOC_DAPM_DAC("Right DAC", "Right Playback", WM8988_PWR2, 7, 0),
 338         SND_SOC_DAPM_DAC("Left DAC", "Left Playback", WM8988_PWR2, 8, 0),
 339
 340         SND_SOC_DAPM_MIXER("Left Mixer", SND_SOC_NOPM, 0, 0,
 341                 &wm8988_left_mixer_controls[0],
 342                 ARRAY_SIZE(wm8988_left_mixer_controls)),
 343         SND_SOC_DAPM_MIXER("Right Mixer", SND_SOC_NOPM, 0, 0,
 344                 &wm8988_right_mixer_controls[0],
 345                 ARRAY_SIZE(wm8988_right_mixer_controls)),
 346
 347         SND_SOC_DAPM_PGA("Right Out 2", WM8988_PWR2, 3, 0, NULL, 0),
 348         SND_SOC_DAPM_PGA("Left Out 2", WM8988_PWR2, 4, 0, NULL, 0),
 349         SND_SOC_DAPM_PGA("Right Out 1", WM8988_PWR2, 5, 0, NULL, 0),
 350         SND_SOC_DAPM_PGA("Left Out 1", WM8988_PWR2, 6, 0, NULL, 0),
 351
 352         SND_SOC_DAPM_POST("LRC control", wm8988_lrc_control),
 353
 354         SND_SOC_DAPM_OUTPUT("LOUT1"),
 355         SND_SOC_DAPM_OUTPUT("ROUT1"),
 356         SND_SOC_DAPM_OUTPUT("LOUT2"),
 357         SND_SOC_DAPM_OUTPUT("ROUT2"),
 358         SND_SOC_DAPM_OUTPUT("VREF"),
 359
 360         SND_SOC_DAPM_INPUT("LINPUT1"),
 361         SND_SOC_DAPM_INPUT("LINPUT2"),
 362         SND_SOC_DAPM_INPUT("RINPUT1"),
 363         SND_SOC_DAPM_INPUT("RINPUT2"),
 364 };
 365
 366 static const struct snd_soc_dapm_route audio_map[] = {
 367
 368         { "Left Line Mux", "Line 1", "LINPUT1" },
 369         { "Left Line Mux", "Line 2", "LINPUT2" },
 370         { "Left Line Mux", "PGA", "Left PGA Mux" },
 371         { "Left Line Mux", "Differential", "Differential Mux" },
 372
 373         { "Right Line Mux", "Line 1", "RINPUT1" },
 374         { "Right Line Mux", "Line 2", "RINPUT2" },
 375         { "Right Line Mux", "PGA", "Right PGA Mux" },
 376         { "Right Line Mux", "Differential", "Differential Mux" },
 377
 378         { "Left PGA Mux", "Line 1", "LINPUT1" },
 379         { "Left PGA Mux", "Line 2", "LINPUT2" },
 380         { "Left PGA Mux", "Differential", "Differential Mux" },
 381
 382         { "Right PGA Mux", "Line 1", "RINPUT1" },
 383         { "Right PGA Mux", "Line 2", "RINPUT2" },
 384         { "Right PGA Mux", "Differential", "Differential Mux" },
 385
 386         { "Differential Mux", "Line 1", "LINPUT1" },
 387         { "Differential Mux", "Line 1", "RINPUT1" },
 388         { "Differential Mux", "Line 2", "LINPUT2" },
 389         { "Differential Mux", "Line 2", "RINPUT2" },
 390
 391         { "Left ADC Mux", "Stereo", "Left PGA Mux" },
 392         { "Left ADC Mux", "Mono (Left)", "Left PGA Mux" },
 393         { "Left ADC Mux", "Digital Mono", "Left PGA Mux" },
 394
 395         { "Right ADC Mux", "Stereo", "Right PGA Mux" },
 396         { "Right ADC Mux", "Mono (Right)", "Right PGA Mux" },
 397         { "Right ADC Mux", "Digital Mono", "Right PGA Mux" },
 398
 399         { "Left ADC", NULL, "Left ADC Mux" },
 400         { "Right ADC", NULL, "Right ADC Mux" },
 401
 402         { "Left Line Mux", "Line 1", "LINPUT1" },
 403         { "Left Line Mux", "Line 2", "LINPUT2" },
 404         { "Left Line Mux", "PGA", "Left PGA Mux" },
 405         { "Left Line Mux", "Differential", "Differential Mux" },
 406
 407         { "Right Line Mux", "Line 1", "RINPUT1" },
 408         { "Right Line Mux", "Line 2", "RINPUT2" },
 409         { "Right Line Mux", "PGA", "Right PGA Mux" },
 410         { "Right Line Mux", "Differential", "Differential Mux" },
 411
 412         { "Left Mixer", "Playback Switch", "Left DAC" },
 413         { "Left Mixer", "Left Bypass Switch", "Left Line Mux" },
 414         { "Left Mixer", "Right Playback Switch", "Right DAC" },
 415         { "Left Mixer", "Right Bypass Switch", "Right Line Mux" },
 416
 417         { "Right Mixer", "Left Playback Switch", "Left DAC" },
 418         { "Right Mixer", "Left Bypass Switch", "Left Line Mux" },
 419         { "Right Mixer", "Playback Switch", "Right DAC" },
 420         { "Right Mixer", "Right Bypass Switch", "Right Line Mux" },
 421
 422         { "Left Out 1", NULL, "Left Mixer" },
 423         { "LOUT1", NULL, "Left Out 1" },
 424         { "Right Out 1", NULL, "Right Mixer" },
 425         { "ROUT1", NULL, "Right Out 1" },
 426
 427         { "Left Out 2", NULL, "Left Mixer" },
 428         { "LOUT2", NULL, "Left Out 2" },
 429         { "Right Out 2", NULL, "Right Mixer" },
 430         { "ROUT2", NULL, "Right Out 2" },
 431 };
 432
 433 struct _coeff_div {
 434         u32 mclk;
 435         u32 rate;
 436         u16 fs;
 437         u8 sr:5;
 438         u8 usb:1;
 439 };
 440
 441 /* codec hifi mclk clock divider coefficients */
 442 static const struct _coeff_div coeff_div[] = {
 443         /* 8k */
 444         {12288000, 8000, 1536, 0x6, 0x0},
 445         {11289600, 8000, 1408, 0x16, 0x0},
 446         {18432000, 8000, 2304, 0x7, 0x0},
 447         {16934400, 8000, 2112, 0x17, 0x0},
 448         {12000000, 8000, 1500, 0x6, 0x1},
 449
 450         /* 11.025k */
 451         {11289600, 11025, 1024, 0x18, 0x0},
 452         {16934400, 11025, 1536, 0x19, 0x0},
 453         {12000000, 11025, 1088, 0x19, 0x1},
 454
 455         /* 16k */
 456         {12288000, 16000, 768, 0xa, 0x0},
 457         {18432000, 16000, 1152, 0xb, 0x0},
 458         {12000000, 16000, 750, 0xa, 0x1},
 459
 460         /* 22.05k */
 461         {11289600, 22050, 512, 0x1a, 0x0},
 462         {16934400, 22050, 768, 0x1b, 0x0},
 463         {12000000, 22050, 544, 0x1b, 0x1},
 464
 465         /* 32k */
 466         {12288000, 32000, 384, 0xc, 0x0},
 467         {18432000, 32000, 576, 0xd, 0x0},
 468         {12000000, 32000, 375, 0xa, 0x1},
 469
 470         /* 44.1k */
 471         {11289600, 44100, 256, 0x10, 0x0},
 472         {16934400, 44100, 384, 0x11, 0x0},
 473         {12000000, 44100, 272, 0x11, 0x1},
 474
 475         /* 48k */
 476         {12288000, 48000, 256, 0x0, 0x0},
 477         {18432000, 48000, 384, 0x1, 0x0},
 478         {12000000, 48000, 250, 0x0, 0x1},
 479
 480         /* 88.2k */
 481         {11289600, 88200, 128, 0x1e, 0x0},
 482         {16934400, 88200, 192, 0x1f, 0x0},
 483         {12000000, 88200, 136, 0x1f, 0x1},
 484
 485         /* 96k */
 486         {12288000, 96000, 128, 0xe, 0x0},
 487         {18432000, 96000, 192, 0xf, 0x0},
 488         {12000000, 96000, 125, 0xe, 0x1},
 489 };
 490
 491 static inline int get_coeff(int mclk, int rate)
 492 {
 493         int i;
 494
 495         for (i = 0; i < ARRAY_SIZE(coeff_div); i++) {
 496                 if (coeff_div[i].rate == rate && coeff_div[i].mclk == mclk)
 497                         return i;
 498         }
 499
 500         return -EINVAL;
 501 }
 502
 503 /* The set of rates we can generate from the above for each SYSCLK */
 504
 505 static unsigned int rates_12288[] = {
 506         8000, 12000, 16000, 24000, 24000, 32000, 48000, 96000,
 507 };
 508
 509 static struct snd_pcm_hw_constraint_list constraints_12288 = {
 510         .count  = ARRAY_SIZE(rates_12288),
 511         .list   = rates_12288,
 512 };
 513
 514 static unsigned int rates_112896[] = {
 515         8000, 11025, 22050, 44100,
 516 };
 517
 518 static struct snd_pcm_hw_constraint_list constraints_112896 = {
 519         .count  = ARRAY_SIZE(rates_112896),
 520         .list   = rates_112896,
 521 };
 522
 523 static unsigned int rates_12[] = {
 524         8000, 11025, 12000, 16000, 22050, 2400, 32000, 41100, 48000,
 525         48000, 88235, 96000,
 526 };
 527
 528 static struct snd_pcm_hw_constraint_list constraints_12 = {
 529         .count  = ARRAY_SIZE(rates_12),
 530         .list   = rates_12,
 531 };
 532
 533 /*
 534  * Note that this should be called from init rather than from hw_params.
 535  */
 536 static int wm8988_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 537                 int clk_id, unsigned int freq, int dir)
 538 {
 539         struct snd_soc_codec *codec = codec_dai->codec;
 540         struct wm8988_priv *wm8988 = codec->private_data;
 541
 542         switch (freq) {
 543         case 11289600:
 544         case 18432000:
 545         case 22579200:
 546         case 36864000:
 547                 wm8988->sysclk_constraints = &constraints_112896;
 548                 wm8988->sysclk = freq;
 549                 return 0;
 550
 551         case 12288000:
 552         case 16934400:
 553         case 24576000:
 554         case 33868800:
 555                 wm8988->sysclk_constraints = &constraints_12288;
 556                 wm8988->sysclk = freq;
 557                 return 0;
 558
 559         case 12000000:
 560         case 24000000:
 561                 wm8988->sysclk_constraints = &constraints_12;
 562                 wm8988->sysclk = freq;
 563                 return 0;
 564         }
 565         return -EINVAL;
 566 }
 567
 568 static int wm8988_set_dai_fmt(struct snd_soc_dai *codec_dai,
 569                 unsigned int fmt)
 570 {
 571         struct snd_soc_codec *codec = codec_dai->codec;
 572         u16 iface = 0;
 573
 574         /* set master/slave audio interface */
 575         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 576         case SND_SOC_DAIFMT_CBM_CFM:
 577                 iface = 0x0040;
 578                 break;
 579         case SND_SOC_DAIFMT_CBS_CFS:
 580                 break;
 581         default:
 582                 return -EINVAL;
 583         }
 584
 585         /* interface format */
 586         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 587         case SND_SOC_DAIFMT_I2S:
 588                 iface |= 0x0002;
 589                 break;
 590         case SND_SOC_DAIFMT_RIGHT_J:
 591                 break;
 592         case SND_SOC_DAIFMT_LEFT_J:
 593                 iface |= 0x0001;
 594                 break;
 595         case SND_SOC_DAIFMT_DSP_A:
 596                 iface |= 0x0003;
 597                 break;
 598         case SND_SOC_DAIFMT_DSP_B:
 599                 iface |= 0x0013;
 600                 break;
 601         default:
 602                 return -EINVAL;
 603         }
 604
 605         /* clock inversion */
 606         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 607         case SND_SOC_DAIFMT_NB_NF:
 608                 break;
 609         case SND_SOC_DAIFMT_IB_IF:
 610                 iface |= 0x0090;
 611                 break;
 612         case SND_SOC_DAIFMT_IB_NF:
 613                 iface |= 0x0080;
 614                 break;
 615         case SND_SOC_DAIFMT_NB_IF:
 616                 iface |= 0x0010;
 617                 break;
 618         default:
 619                 return -EINVAL;
 620         }
 621
 622         wm8988_write(codec, WM8988_IFACE, iface);
 623         return 0;
 624 }
 625
 626 static int wm8988_pcm_startup(struct snd_pcm_substream *substream,
 627                               struct snd_soc_dai *dai)
 628 {
 629         struct snd_soc_codec *codec = dai->codec;
 630         struct wm8988_priv *wm8988 = codec->private_data;
 631
 632         /* The set of sample rates that can be supported depends on the
 633          * MCLK supplied to the CODEC - enforce this.
 634          */
 635         if (!wm8988->sysclk) {
 636                 dev_err(codec->dev,
 637                         "No MCLK configured, call set_sysclk() on init\n");
 638                 return -EINVAL;
 639         }
 640
 641         snd_pcm_hw_constraint_list(substream->runtime, 0,
 642                                    SNDRV_PCM_HW_PARAM_RATE,
 643                                    wm8988->sysclk_constraints);
 644
 645         return 0;
 646 }
 647
 648 static int wm8988_pcm_hw_params(struct snd_pcm_substream *substream,
 649                                 struct snd_pcm_hw_params *params,
 650                                 struct snd_soc_dai *dai)
 651 {
 652         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 653         struct snd_soc_device *socdev = rtd->socdev;
 654         struct snd_soc_codec *codec = socdev->card->codec;
 655         struct wm8988_priv *wm8988 = codec->private_data;
 656         u16 iface = wm8988_read_reg_cache(codec, WM8988_IFACE) & 0x1f3;
 657         u16 srate = wm8988_read_reg_cache(codec, WM8988_SRATE) & 0x180;
 658         int coeff;
 659
 660         coeff = get_coeff(wm8988->sysclk, params_rate(params));
 661         if (coeff < 0) {
 662                 coeff = get_coeff(wm8988->sysclk / 2, params_rate(params));
 663                 srate |= 0x40;
 664         }
 665         if (coeff < 0) {
 666                 dev_err(codec->dev,
 667                         "Unable to configure sample rate %dHz with %dHz MCLK\n",
 668                         params_rate(params), wm8988->sysclk);
 669                 return coeff;
 670         }
 671
 672         /* bit size */
 673         switch (params_format(params)) {
 674         case SNDRV_PCM_FORMAT_S16_LE:
 675                 break;
 676         case SNDRV_PCM_FORMAT_S20_3LE:
 677                 iface |= 0x0004;
 678                 break;
 679         case SNDRV_PCM_FORMAT_S24_LE:
 680                 iface |= 0x0008;
 681                 break;
 682         case SNDRV_PCM_FORMAT_S32_LE:
 683                 iface |= 0x000c;
 684                 break;
 685         }
 686
 687         /* set iface & srate */
 688         wm8988_write(codec, WM8988_IFACE, iface);
 689         if (coeff >= 0)
 690                 wm8988_write(codec, WM8988_SRATE, srate |
 691                         (coeff_div[coeff].sr << 1) | coeff_div[coeff].usb);
 692
 693         return 0;
 694 }
 695
 696 static int wm8988_mute(struct snd_soc_dai *dai, int mute)
 697 {
 698         struct snd_soc_codec *codec = dai->codec;
 699         u16 mute_reg = wm8988_read_reg_cache(codec, WM8988_ADCDAC) & 0xfff7;
 700
 701         if (mute)
 702                 wm8988_write(codec, WM8988_ADCDAC, mute_reg | 0x8);
 703         else
 704                 wm8988_write(codec, WM8988_ADCDAC, mute_reg);
 705         return 0;
 706 }
 707
 708 static int wm8988_set_bias_level(struct snd_soc_codec *codec,
 709                                  enum snd_soc_bias_level level)
 710 {
 711         u16 pwr_reg = wm8988_read_reg_cache(codec, WM8988_PWR1) & ~0x1c1;
 712
 713         switch (level) {
 714         case SND_SOC_BIAS_ON:
 715                 break;
 716
 717         case SND_SOC_BIAS_PREPARE:
 718                 /* VREF, VMID=2x50k, digital enabled */
 719                 wm8988_write(codec, WM8988_PWR1, pwr_reg | 0x00c0);
 720                 break;
 721
 722         case SND_SOC_BIAS_STANDBY:
 723                 if (codec->bias_level == SND_SOC_BIAS_OFF) {
 724                         /* VREF, VMID=2x5k */
 725                         wm8988_write(codec, WM8988_PWR1, pwr_reg | 0x1c1);
 726
 727                         /* Charge caps */
 728                         msleep(100);
 729                 }
 730
 731                 /* VREF, VMID=2*500k, digital stopped */
 732                 wm8988_write(codec, WM8988_PWR1, pwr_reg | 0x0141);
 733                 break;
 734
 735         case SND_SOC_BIAS_OFF:
 736                 wm8988_write(codec, WM8988_PWR1, 0x0000);
 737                 break;
 738         }
 739         codec->bias_level = level;
 740         return 0;
 741 }
 742
 743 #define WM8988_RATES SNDRV_PCM_RATE_8000_96000
 744
 745 #define WM8988_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 746         SNDRV_PCM_FMTBIT_S24_LE)
 747
 748 static struct snd_soc_dai_ops wm8988_ops = {
 749         .startup = wm8988_pcm_startup,
 750         .hw_params = wm8988_pcm_hw_params,
 751         .set_fmt = wm8988_set_dai_fmt,
 752         .set_sysclk = wm8988_set_dai_sysclk,
 753         .digital_mute = wm8988_mute,
 754 };
 755
 756 struct snd_soc_dai wm8988_dai = {
 757         .name = "WM8988",
 758         .playback = {
 759                 .stream_name = "Playback",
 760                 .channels_min = 1,
 761                 .channels_max = 2,
 762                 .rates = WM8988_RATES,
 763                 .formats = WM8988_FORMATS,
 764         },
 765         .capture = {
 766                 .stream_name = "Capture",
 767                 .channels_min = 1,
 768                 .channels_max = 2,
 769                 .rates = WM8988_RATES,
 770                 .formats = WM8988_FORMATS,
 771          },
 772         .ops = &wm8988_ops,
 773         .symmetric_rates = 1,
 774 };
 775 EXPORT_SYMBOL_GPL(wm8988_dai);
 776
 777 static int wm8988_suspend(struct platform_device *pdev, pm_message_t state)
 778 {
 779         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 780         struct snd_soc_codec *codec = socdev->card->codec;
 781
 782         wm8988_set_bias_level(codec, SND_SOC_BIAS_OFF);
 783         return 0;
 784 }
 785
 786 static int wm8988_resume(struct platform_device *pdev)
 787 {
 788         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 789         struct snd_soc_codec *codec = socdev->card->codec;
 790         int i;
 791         u8 data[2];
 792         u16 *cache = codec->reg_cache;
 793
 794         /* Sync reg_cache with the hardware */
 795         for (i = 0; i < WM8988_NUM_REG; i++) {
 796                 if (i == WM8988_RESET)
 797                         continue;
 798                 data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
 799                 data[1] = cache[i] & 0x00ff;
 800                 codec->hw_write(codec->control_data, data, 2);
 801         }
 802
 803         wm8988_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 804
 805         return 0;
 806 }
 807
 808 static struct snd_soc_codec *wm8988_codec;
 809
 810 static int wm8988_probe(struct platform_device *pdev)
 811 {
 812         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 813         struct snd_soc_codec *codec;
 814         int ret = 0;
 815
 816         if (wm8988_codec == NULL) {
 817                 dev_err(&pdev->dev, "Codec device not registered\n");
 818                 return -ENODEV;
 819         }
 820
 821         socdev->card->codec = wm8988_codec;
 822         codec = wm8988_codec;
 823
 824         /* register pcms */
 825         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 826         if (ret < 0) {
 827                 dev_err(codec->dev, "failed to create pcms: %d\n", ret);
 828                 goto pcm_err;
 829         }
 830
 831         snd_soc_add_controls(codec, wm8988_snd_controls,
 832                                 ARRAY_SIZE(wm8988_snd_controls));
 833         snd_soc_dapm_new_controls(codec, wm8988_dapm_widgets,
 834                                   ARRAY_SIZE(wm8988_dapm_widgets));
 835         snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));
 836         snd_soc_dapm_new_widgets(codec);
 837
 838         ret = snd_soc_init_card(socdev);
 839         if (ret < 0) {
 840                 dev_err(codec->dev, "failed to register card: %d\n", ret);
 841                 goto card_err;
 842         }
 843
 844         return ret;
 845
 846 card_err:
 847         snd_soc_free_pcms(socdev);
 848         snd_soc_dapm_free(socdev);
 849 pcm_err:
 850         return ret;
 851 }
 852
 853 static int wm8988_remove(struct platform_device *pdev)
 854 {
 855         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 856
 857         snd_soc_free_pcms(socdev);
 858         snd_soc_dapm_free(socdev);
 859
 860         return 0;
 861 }
 862
 863 struct snd_soc_codec_device soc_codec_dev_wm8988 = {
 864         .probe =        wm8988_probe,
 865         .remove =       wm8988_remove,
 866         .suspend =      wm8988_suspend,
 867         .resume =       wm8988_resume,
 868 };
 869 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8988);
 870
 871 static int wm8988_register(struct wm8988_priv *wm8988)
 872 {
 873         struct snd_soc_codec *codec = &wm8988->codec;
 874         int ret;
 875         u16 reg;
 876
 877         if (wm8988_codec) {
 878                 dev_err(codec->dev, "Another WM8988 is registered\n");
 879                 ret = -EINVAL;
 880                 goto err;
 881         }
 882
 883         mutex_init(&codec->mutex);
 884         INIT_LIST_HEAD(&codec->dapm_widgets);
 885         INIT_LIST_HEAD(&codec->dapm_paths);
 886
 887         codec->private_data = wm8988;
 888         codec->name = "WM8988";
 889         codec->owner = THIS_MODULE;
 890         codec->read = wm8988_read_reg_cache;
 891         codec->write = wm8988_write;
 892         codec->dai = &wm8988_dai;
 893         codec->num_dai = 1;
 894         codec->reg_cache_size = ARRAY_SIZE(wm8988->reg_cache);
 895         codec->reg_cache = &wm8988->reg_cache;
 896         codec->bias_level = SND_SOC_BIAS_OFF;
 897         codec->set_bias_level = wm8988_set_bias_level;
 898
 899         memcpy(codec->reg_cache, wm8988_reg,
 900                sizeof(wm8988_reg));
 901
 902         ret = wm8988_reset(codec);
 903         if (ret < 0) {
 904                 dev_err(codec->dev, "Failed to issue reset\n");
 905                 return ret;
 906         }
 907
 908         /* set the update bits (we always update left then right) */
 909         reg = wm8988_read_reg_cache(codec, WM8988_RADC);
 910         wm8988_write(codec, WM8988_RADC, reg | 0x100);
 911         reg = wm8988_read_reg_cache(codec, WM8988_RDAC);
 912         wm8988_write(codec, WM8988_RDAC, reg | 0x0100);
 913         reg = wm8988_read_reg_cache(codec, WM8988_ROUT1V);
 914         wm8988_write(codec, WM8988_ROUT1V, reg | 0x0100);
 915         reg = wm8988_read_reg_cache(codec, WM8988_ROUT2V);
 916         wm8988_write(codec, WM8988_ROUT2V, reg | 0x0100);
 917         reg = wm8988_read_reg_cache(codec, WM8988_RINVOL);
 918         wm8988_write(codec, WM8988_RINVOL, reg | 0x0100);
 919
 920         wm8988_set_bias_level(&wm8988->codec, SND_SOC_BIAS_STANDBY);
 921
 922         wm8988_dai.dev = codec->dev;
 923
 924         wm8988_codec = codec;
 925
 926         ret = snd_soc_register_codec(codec);
 927         if (ret != 0) {
 928                 dev_err(codec->dev, "Failed to register codec: %d\n", ret);
 929                 return ret;
 930         }
 931
 932         ret = snd_soc_register_dai(&wm8988_dai);
 933         if (ret != 0) {
 934                 dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
 935                 snd_soc_unregister_codec(codec);
 936                 return ret;
 937         }
 938
 939         return 0;
 940
 941 err:
 942         kfree(wm8988);
 943         return ret;
 944 }
 945
 946 static void wm8988_unregister(struct wm8988_priv *wm8988)
 947 {
 948         wm8988_set_bias_level(&wm8988->codec, SND_SOC_BIAS_OFF);
 949         snd_soc_unregister_dai(&wm8988_dai);
 950         snd_soc_unregister_codec(&wm8988->codec);
 951         kfree(wm8988);
 952         wm8988_codec = NULL;
 953 }
 954
 955 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 956 static int wm8988_i2c_probe(struct i2c_client *i2c,
 957                             const struct i2c_device_id *id)
 958 {
 959         struct wm8988_priv *wm8988;
 960         struct snd_soc_codec *codec;
 961
 962         wm8988 = kzalloc(sizeof(struct wm8988_priv), GFP_KERNEL);
 963         if (wm8988 == NULL)
 964                 return -ENOMEM;
 965
 966         codec = &wm8988->codec;
 967         codec->hw_write = (hw_write_t)i2c_master_send;
 968
 969         i2c_set_clientdata(i2c, wm8988);
 970         codec->control_data = i2c;
 971
 972         codec->dev = &i2c->dev;
 973
 974         return wm8988_register(wm8988);
 975 }
 976
 977 static int wm8988_i2c_remove(struct i2c_client *client)
 978 {
 979         struct wm8988_priv *wm8988 = i2c_get_clientdata(client);
 980         wm8988_unregister(wm8988);
 981         return 0;
 982 }
 983
 984 static const struct i2c_device_id wm8988_i2c_id[] = {
 985         { "wm8988", 0 },
 986         { }
 987 };
 988 MODULE_DEVICE_TABLE(i2c, wm8988_i2c_id);
 989
 990 static struct i2c_driver wm8988_i2c_driver = {
 991         .driver = {
 992                 .name = "WM8988",
 993                 .owner = THIS_MODULE,
 994         },
 995         .probe = wm8988_i2c_probe,
 996         .remove = wm8988_i2c_remove,
 997         .id_table = wm8988_i2c_id,
 998 };
 999 #endif
1000
1001 #if defined(CONFIG_SPI_MASTER)
1002 static int wm8988_spi_write(struct spi_device *spi, const char *data, int len)
1003 {
1004         struct spi_transfer t;
1005         struct spi_message m;
1006         u8 msg[2];
1007
1008         if (len <= 0)
1009                 return 0;
1010
1011         msg[0] = data[0];
1012         msg[1] = data[1];
1013
1014         spi_message_init(&m);
1015         memset(&t, 0, (sizeof t));
1016
1017         t.tx_buf = &msg[0];
1018         t.len = len;
1019
1020         spi_message_add_tail(&t, &m);
1021         spi_sync(spi, &m);
1022
1023         return len;
1024 }
1025
1026 static int __devinit wm8988_spi_probe(struct spi_device *spi)
1027 {
1028         struct wm8988_priv *wm8988;
1029         struct snd_soc_codec *codec;
1030
1031         wm8988 = kzalloc(sizeof(struct wm8988_priv), GFP_KERNEL);
1032         if (wm8988 == NULL)
1033                 return -ENOMEM;
1034
1035         codec = &wm8988->codec;
1036         codec->hw_write = (hw_write_t)wm8988_spi_write;
1037         codec->control_data = spi;
1038         codec->dev = &spi->dev;
1039
1040         dev_set_drvdata(&spi->dev, wm8988);
1041
1042         return wm8988_register(wm8988);
1043 }
1044
1045 static int __devexit wm8988_spi_remove(struct spi_device *spi)
1046 {
1047         struct wm8988_priv *wm8988 = dev_get_drvdata(&spi->dev);
1048
1049         wm8988_unregister(wm8988);
1050
1051         return 0;
1052 }
1053
1054 static struct spi_driver wm8988_spi_driver = {
1055         .driver = {
1056                 .name   = "wm8988",
1057                 .bus    = &spi_bus_type,
1058                 .owner  = THIS_MODULE,
1059         },
1060         .probe          = wm8988_spi_probe,
1061         .remove         = __devexit_p(wm8988_spi_remove),
1062 };
1063 #endif
1064
1065 static int __init wm8988_modinit(void)
1066 {
1067         int ret;
1068
1069 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
1070         ret = i2c_add_driver(&wm8988_i2c_driver);
1071         if (ret != 0)
1072                 pr_err("WM8988: Unable to register I2C driver: %d\n", ret);
1073 #endif
1074 #if defined(CONFIG_SPI_MASTER)
1075         ret = spi_register_driver(&wm8988_spi_driver);
1076         if (ret != 0)
1077                 pr_err("WM8988: Unable to register SPI driver: %d\n", ret);
1078 #endif
1079         return ret;
1080 }
1081 module_init(wm8988_modinit);
1082
1083 static void __exit wm8988_exit(void)
1084 {
1085 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
1086         i2c_del_driver(&wm8988_i2c_driver);
1087 #endif
1088 #if defined(CONFIG_SPI_MASTER)
1089         spi_unregister_driver(&wm8988_spi_driver);
1090 #endif
1091 }
1092 module_exit(wm8988_exit);
1093
1094
1095 MODULE_DESCRIPTION("ASoC WM8988 driver");
1096 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
1097 MODULE_LICENSE("GPL");