1 /* 2 * wm8940.c -- WM8940 ALSA Soc Audio driver 3 * 4 * Author: Jonathan Cameron <jic23@cam.ac.uk> 5 * 6 * Based on wm8510.c 7 * Copyright 2006 Wolfson Microelectronics PLC. 8 * Author: Liam Girdwood <lrg@slimlogic.co.uk> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License version 2 as 12 * published by the Free Software Foundation. 13 * 14 * Not currently handled: 15 * Notch filter control 16 * AUXMode (inverting vs mixer) 17 * No means to obtain current gain if alc enabled. 18 * No use made of gpio 19 * Fast VMID discharge for power down 20 * Soft Start 21 * DLR and ALR Swaps not enabled 22 * Digital Sidetone not supported 23 */ 24 #include <linux/module.h> 25 #include <linux/moduleparam.h> 26 #include <linux/kernel.h> 27 #include <linux/init.h> 28 #include <linux/delay.h> 29 #include <linux/pm.h> 30 #include <linux/i2c.h> 31 #include <linux/platform_device.h> 32 #include <linux/spi/spi.h> 33 #include <linux/slab.h> 34 #include <sound/core.h> 35 #include <sound/pcm.h> 36 #include <sound/pcm_params.h> 37 #include <sound/soc.h> 38 #include <sound/initval.h> 39 #include <sound/tlv.h> 40 41 #include "wm8940.h" 42 43 struct wm8940_priv { 44 unsigned int sysclk; 45 enum snd_soc_control_type control_type; 46 }; 47 48 static int wm8940_volatile_register(struct snd_soc_codec *codec, 49 unsigned int reg) 50 { 51 switch (reg) { 52 case WM8940_SOFTRESET: 53 return 1; 54 default: 55 return 0; 56 } 57 } 58 59 static u16 wm8940_reg_defaults[] = { 60 0x8940, /* Soft Reset */ 61 0x0000, /* Power 1 */ 62 0x0000, /* Power 2 */ 63 0x0000, /* Power 3 */ 64 0x0010, /* Interface Control */ 65 0x0000, /* Companding Control */ 66 0x0140, /* Clock Control */ 67 0x0000, /* Additional Controls */ 68 0x0000, /* GPIO Control */ 69 0x0002, /* Auto Increment Control */ 70 0x0000, /* DAC Control */ 71 0x00FF, /* DAC Volume */ 72 0, 73 0, 74 0x0100, /* ADC Control */ 75 0x00FF, /* ADC Volume */ 76 0x0000, /* Notch Filter 1 Control 1 */ 77 0x0000, /* Notch Filter 1 Control 2 */ 78 0x0000, /* Notch Filter 2 Control 1 */ 79 0x0000, /* Notch Filter 2 Control 2 */ 80 0x0000, /* Notch Filter 3 Control 1 */ 81 0x0000, /* Notch Filter 3 Control 2 */ 82 0x0000, /* Notch Filter 4 Control 1 */ 83 0x0000, /* Notch Filter 4 Control 2 */ 84 0x0032, /* DAC Limit Control 1 */ 85 0x0000, /* DAC Limit Control 2 */ 86 0, 87 0, 88 0, 89 0, 90 0, 91 0, 92 0x0038, /* ALC Control 1 */ 93 0x000B, /* ALC Control 2 */ 94 0x0032, /* ALC Control 3 */ 95 0x0000, /* Noise Gate */ 96 0x0041, /* PLLN */ 97 0x000C, /* PLLK1 */ 98 0x0093, /* PLLK2 */ 99 0x00E9, /* PLLK3 */ 100 0, 101 0, 102 0x0030, /* ALC Control 4 */ 103 0, 104 0x0002, /* Input Control */ 105 0x0050, /* PGA Gain */ 106 0, 107 0x0002, /* ADC Boost Control */ 108 0, 109 0x0002, /* Output Control */ 110 0x0000, /* Speaker Mixer Control */ 111 0, 112 0, 113 0, 114 0x0079, /* Speaker Volume */ 115 0, 116 0x0000, /* Mono Mixer Control */ 117 }; 118 119 static const char *wm8940_companding[] = { "Off", "NC", "u-law", "A-law" }; 120 static const struct soc_enum wm8940_adc_companding_enum 121 = SOC_ENUM_SINGLE(WM8940_COMPANDINGCTL, 1, 4, wm8940_companding); 122 static const struct soc_enum wm8940_dac_companding_enum 123 = SOC_ENUM_SINGLE(WM8940_COMPANDINGCTL, 3, 4, wm8940_companding); 124 125 static const char *wm8940_alc_mode_text[] = {"ALC", "Limiter"}; 126 static const struct soc_enum wm8940_alc_mode_enum 127 = SOC_ENUM_SINGLE(WM8940_ALC3, 8, 2, wm8940_alc_mode_text); 128 129 static const char *wm8940_mic_bias_level_text[] = {"0.9", "0.65"}; 130 static const struct soc_enum wm8940_mic_bias_level_enum 131 = SOC_ENUM_SINGLE(WM8940_INPUTCTL, 8, 2, wm8940_mic_bias_level_text); 132 133 static const char *wm8940_filter_mode_text[] = {"Audio", "Application"}; 134 static const struct soc_enum wm8940_filter_mode_enum 135 = SOC_ENUM_SINGLE(WM8940_ADC, 7, 2, wm8940_filter_mode_text); 136 137 static DECLARE_TLV_DB_SCALE(wm8940_spk_vol_tlv, -5700, 100, 1); 138 static DECLARE_TLV_DB_SCALE(wm8940_att_tlv, -1000, 1000, 0); 139 static DECLARE_TLV_DB_SCALE(wm8940_pga_vol_tlv, -1200, 75, 0); 140 static DECLARE_TLV_DB_SCALE(wm8940_alc_min_tlv, -1200, 600, 0); 141 static DECLARE_TLV_DB_SCALE(wm8940_alc_max_tlv, 675, 600, 0); 142 static DECLARE_TLV_DB_SCALE(wm8940_alc_tar_tlv, -2250, 50, 0); 143 static DECLARE_TLV_DB_SCALE(wm8940_lim_boost_tlv, 0, 100, 0); 144 static DECLARE_TLV_DB_SCALE(wm8940_lim_thresh_tlv, -600, 100, 0); 145 static DECLARE_TLV_DB_SCALE(wm8940_adc_tlv, -12750, 50, 1); 146 static DECLARE_TLV_DB_SCALE(wm8940_capture_boost_vol_tlv, 0, 2000, 0); 147 148 static const struct snd_kcontrol_new wm8940_snd_controls[] = { 149 SOC_SINGLE("Digital Loopback Switch", WM8940_COMPANDINGCTL, 150 6, 1, 0), 151 SOC_ENUM("DAC Companding", wm8940_dac_companding_enum), 152 SOC_ENUM("ADC Companding", wm8940_adc_companding_enum), 153 154 SOC_ENUM("ALC Mode", wm8940_alc_mode_enum), 155 SOC_SINGLE("ALC Switch", WM8940_ALC1, 8, 1, 0), 156 SOC_SINGLE_TLV("ALC Capture Max Gain", WM8940_ALC1, 157 3, 7, 1, wm8940_alc_max_tlv), 158 SOC_SINGLE_TLV("ALC Capture Min Gain", WM8940_ALC1, 159 0, 7, 0, wm8940_alc_min_tlv), 160 SOC_SINGLE_TLV("ALC Capture Target", WM8940_ALC2, 161 0, 14, 0, wm8940_alc_tar_tlv), 162 SOC_SINGLE("ALC Capture Hold", WM8940_ALC2, 4, 10, 0), 163 SOC_SINGLE("ALC Capture Decay", WM8940_ALC3, 4, 10, 0), 164 SOC_SINGLE("ALC Capture Attach", WM8940_ALC3, 0, 10, 0), 165 SOC_SINGLE("ALC ZC Switch", WM8940_ALC4, 1, 1, 0), 166 SOC_SINGLE("ALC Capture Noise Gate Switch", WM8940_NOISEGATE, 167 3, 1, 0), 168 SOC_SINGLE("ALC Capture Noise Gate Threshold", WM8940_NOISEGATE, 169 0, 7, 0), 170 171 SOC_SINGLE("DAC Playback Limiter Switch", WM8940_DACLIM1, 8, 1, 0), 172 SOC_SINGLE("DAC Playback Limiter Attack", WM8940_DACLIM1, 0, 9, 0), 173 SOC_SINGLE("DAC Playback Limiter Decay", WM8940_DACLIM1, 4, 11, 0), 174 SOC_SINGLE_TLV("DAC Playback Limiter Threshold", WM8940_DACLIM2, 175 4, 9, 1, wm8940_lim_thresh_tlv), 176 SOC_SINGLE_TLV("DAC Playback Limiter Boost", WM8940_DACLIM2, 177 0, 12, 0, wm8940_lim_boost_tlv), 178 179 SOC_SINGLE("Capture PGA ZC Switch", WM8940_PGAGAIN, 7, 1, 0), 180 SOC_SINGLE_TLV("Capture PGA Volume", WM8940_PGAGAIN, 181 0, 63, 0, wm8940_pga_vol_tlv), 182 SOC_SINGLE_TLV("Digital Playback Volume", WM8940_DACVOL, 183 0, 255, 0, wm8940_adc_tlv), 184 SOC_SINGLE_TLV("Digital Capture Volume", WM8940_ADCVOL, 185 0, 255, 0, wm8940_adc_tlv), 186 SOC_ENUM("Mic Bias Level", wm8940_mic_bias_level_enum), 187 SOC_SINGLE_TLV("Capture Boost Volue", WM8940_ADCBOOST, 188 8, 1, 0, wm8940_capture_boost_vol_tlv), 189 SOC_SINGLE_TLV("Speaker Playback Volume", WM8940_SPKVOL, 190 0, 63, 0, wm8940_spk_vol_tlv), 191 SOC_SINGLE("Speaker Playback Switch", WM8940_SPKVOL, 6, 1, 1), 192 193 SOC_SINGLE_TLV("Speaker Mixer Line Bypass Volume", WM8940_SPKVOL, 194 8, 1, 1, wm8940_att_tlv), 195 SOC_SINGLE("Speaker Playback ZC Switch", WM8940_SPKVOL, 7, 1, 0), 196 197 SOC_SINGLE("Mono Out Switch", WM8940_MONOMIX, 6, 1, 1), 198 SOC_SINGLE_TLV("Mono Mixer Line Bypass Volume", WM8940_MONOMIX, 199 7, 1, 1, wm8940_att_tlv), 200 201 SOC_SINGLE("High Pass Filter Switch", WM8940_ADC, 8, 1, 0), 202 SOC_ENUM("High Pass Filter Mode", wm8940_filter_mode_enum), 203 SOC_SINGLE("High Pass Filter Cut Off", WM8940_ADC, 4, 7, 0), 204 SOC_SINGLE("ADC Inversion Switch", WM8940_ADC, 0, 1, 0), 205 SOC_SINGLE("DAC Inversion Switch", WM8940_DAC, 0, 1, 0), 206 SOC_SINGLE("DAC Auto Mute Switch", WM8940_DAC, 2, 1, 0), 207 SOC_SINGLE("ZC Timeout Clock Switch", WM8940_ADDCNTRL, 0, 1, 0), 208 }; 209 210 static const struct snd_kcontrol_new wm8940_speaker_mixer_controls[] = { 211 SOC_DAPM_SINGLE("Line Bypass Switch", WM8940_SPKMIX, 1, 1, 0), 212 SOC_DAPM_SINGLE("Aux Playback Switch", WM8940_SPKMIX, 5, 1, 0), 213 SOC_DAPM_SINGLE("PCM Playback Switch", WM8940_SPKMIX, 0, 1, 0), 214 }; 215 216 static const struct snd_kcontrol_new wm8940_mono_mixer_controls[] = { 217 SOC_DAPM_SINGLE("Line Bypass Switch", WM8940_MONOMIX, 1, 1, 0), 218 SOC_DAPM_SINGLE("Aux Playback Switch", WM8940_MONOMIX, 2, 1, 0), 219 SOC_DAPM_SINGLE("PCM Playback Switch", WM8940_MONOMIX, 0, 1, 0), 220 }; 221 222 static DECLARE_TLV_DB_SCALE(wm8940_boost_vol_tlv, -1500, 300, 1); 223 static const struct snd_kcontrol_new wm8940_input_boost_controls[] = { 224 SOC_DAPM_SINGLE("Mic PGA Switch", WM8940_PGAGAIN, 6, 1, 1), 225 SOC_DAPM_SINGLE_TLV("Aux Volume", WM8940_ADCBOOST, 226 0, 7, 0, wm8940_boost_vol_tlv), 227 SOC_DAPM_SINGLE_TLV("Mic Volume", WM8940_ADCBOOST, 228 4, 7, 0, wm8940_boost_vol_tlv), 229 }; 230 231 static const struct snd_kcontrol_new wm8940_micpga_controls[] = { 232 SOC_DAPM_SINGLE("AUX Switch", WM8940_INPUTCTL, 2, 1, 0), 233 SOC_DAPM_SINGLE("MICP Switch", WM8940_INPUTCTL, 0, 1, 0), 234 SOC_DAPM_SINGLE("MICN Switch", WM8940_INPUTCTL, 1, 1, 0), 235 }; 236 237 static const struct snd_soc_dapm_widget wm8940_dapm_widgets[] = { 238 SND_SOC_DAPM_MIXER("Speaker Mixer", WM8940_POWER3, 2, 0, 239 &wm8940_speaker_mixer_controls[0], 240 ARRAY_SIZE(wm8940_speaker_mixer_controls)), 241 SND_SOC_DAPM_MIXER("Mono Mixer", WM8940_POWER3, 3, 0, 242 &wm8940_mono_mixer_controls[0], 243 ARRAY_SIZE(wm8940_mono_mixer_controls)), 244 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8940_POWER3, 0, 0), 245 246 SND_SOC_DAPM_PGA("SpkN Out", WM8940_POWER3, 5, 0, NULL, 0), 247 SND_SOC_DAPM_PGA("SpkP Out", WM8940_POWER3, 6, 0, NULL, 0), 248 SND_SOC_DAPM_PGA("Mono Out", WM8940_POWER3, 7, 0, NULL, 0), 249 SND_SOC_DAPM_OUTPUT("MONOOUT"), 250 SND_SOC_DAPM_OUTPUT("SPKOUTP"), 251 SND_SOC_DAPM_OUTPUT("SPKOUTN"), 252 253 SND_SOC_DAPM_PGA("Aux Input", WM8940_POWER1, 6, 0, NULL, 0), 254 SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8940_POWER2, 0, 0), 255 SND_SOC_DAPM_MIXER("Mic PGA", WM8940_POWER2, 2, 0, 256 &wm8940_micpga_controls[0], 257 ARRAY_SIZE(wm8940_micpga_controls)), 258 SND_SOC_DAPM_MIXER("Boost Mixer", WM8940_POWER2, 4, 0, 259 &wm8940_input_boost_controls[0], 260 ARRAY_SIZE(wm8940_input_boost_controls)), 261 SND_SOC_DAPM_MICBIAS("Mic Bias", WM8940_POWER1, 4, 0), 262 263 SND_SOC_DAPM_INPUT("MICN"), 264 SND_SOC_DAPM_INPUT("MICP"), 265 SND_SOC_DAPM_INPUT("AUX"), 266 }; 267 268 static const struct snd_soc_dapm_route audio_map[] = { 269 /* Mono output mixer */ 270 {"Mono Mixer", "PCM Playback Switch", "DAC"}, 271 {"Mono Mixer", "Aux Playback Switch", "Aux Input"}, 272 {"Mono Mixer", "Line Bypass Switch", "Boost Mixer"}, 273 274 /* Speaker output mixer */ 275 {"Speaker Mixer", "PCM Playback Switch", "DAC"}, 276 {"Speaker Mixer", "Aux Playback Switch", "Aux Input"}, 277 {"Speaker Mixer", "Line Bypass Switch", "Boost Mixer"}, 278 279 /* Outputs */ 280 {"Mono Out", NULL, "Mono Mixer"}, 281 {"MONOOUT", NULL, "Mono Out"}, 282 {"SpkN Out", NULL, "Speaker Mixer"}, 283 {"SpkP Out", NULL, "Speaker Mixer"}, 284 {"SPKOUTN", NULL, "SpkN Out"}, 285 {"SPKOUTP", NULL, "SpkP Out"}, 286 287 /* Microphone PGA */ 288 {"Mic PGA", "MICN Switch", "MICN"}, 289 {"Mic PGA", "MICP Switch", "MICP"}, 290 {"Mic PGA", "AUX Switch", "AUX"}, 291 292 /* Boost Mixer */ 293 {"Boost Mixer", "Mic PGA Switch", "Mic PGA"}, 294 {"Boost Mixer", "Mic Volume", "MICP"}, 295 {"Boost Mixer", "Aux Volume", "Aux Input"}, 296 297 {"ADC", NULL, "Boost Mixer"}, 298 }; 299 300 static int wm8940_add_widgets(struct snd_soc_codec *codec) 301 { 302 struct snd_soc_dapm_context *dapm = &codec->dapm; 303 int ret; 304 305 ret = snd_soc_dapm_new_controls(dapm, wm8940_dapm_widgets, 306 ARRAY_SIZE(wm8940_dapm_widgets)); 307 if (ret) 308 goto error_ret; 309 ret = snd_soc_dapm_add_routes(dapm, audio_map, ARRAY_SIZE(audio_map)); 310 311 error_ret: 312 return ret; 313 } 314 315 #define wm8940_reset(c) snd_soc_write(c, WM8940_SOFTRESET, 0); 316 317 static int wm8940_set_dai_fmt(struct snd_soc_dai *codec_dai, 318 unsigned int fmt) 319 { 320 struct snd_soc_codec *codec = codec_dai->codec; 321 u16 iface = snd_soc_read(codec, WM8940_IFACE) & 0xFE67; 322 u16 clk = snd_soc_read(codec, WM8940_CLOCK) & 0x1fe; 323 324 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { 325 case SND_SOC_DAIFMT_CBM_CFM: 326 clk |= 1; 327 break; 328 case SND_SOC_DAIFMT_CBS_CFS: 329 break; 330 default: 331 return -EINVAL; 332 } 333 snd_soc_write(codec, WM8940_CLOCK, clk); 334 335 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 336 case SND_SOC_DAIFMT_I2S: 337 iface |= (2 << 3); 338 break; 339 case SND_SOC_DAIFMT_LEFT_J: 340 iface |= (1 << 3); 341 break; 342 case SND_SOC_DAIFMT_RIGHT_J: 343 break; 344 case SND_SOC_DAIFMT_DSP_A: 345 iface |= (3 << 3); 346 break; 347 case SND_SOC_DAIFMT_DSP_B: 348 iface |= (3 << 3) | (1 << 7); 349 break; 350 } 351 352 switch (fmt & SND_SOC_DAIFMT_INV_MASK) { 353 case SND_SOC_DAIFMT_NB_NF: 354 break; 355 case SND_SOC_DAIFMT_NB_IF: 356 iface |= (1 << 7); 357 break; 358 case SND_SOC_DAIFMT_IB_NF: 359 iface |= (1 << 8); 360 break; 361 case SND_SOC_DAIFMT_IB_IF: 362 iface |= (1 << 8) | (1 << 7); 363 break; 364 } 365 366 snd_soc_write(codec, WM8940_IFACE, iface); 367 368 return 0; 369 } 370 371 static int wm8940_i2s_hw_params(struct snd_pcm_substream *substream, 372 struct snd_pcm_hw_params *params, 373 struct snd_soc_dai *dai) 374 { 375 struct snd_soc_pcm_runtime *rtd = substream->private_data; 376 struct snd_soc_codec *codec = rtd->codec; 377 u16 iface = snd_soc_read(codec, WM8940_IFACE) & 0xFD9F; 378 u16 addcntrl = snd_soc_read(codec, WM8940_ADDCNTRL) & 0xFFF1; 379 u16 companding = snd_soc_read(codec, 380 WM8940_COMPANDINGCTL) & 0xFFDF; 381 int ret; 382 383 /* LoutR control */ 384 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE 385 && params_channels(params) == 2) 386 iface |= (1 << 9); 387 388 switch (params_rate(params)) { 389 case 8000: 390 addcntrl |= (0x5 << 1); 391 break; 392 case 11025: 393 addcntrl |= (0x4 << 1); 394 break; 395 case 16000: 396 addcntrl |= (0x3 << 1); 397 break; 398 case 22050: 399 addcntrl |= (0x2 << 1); 400 break; 401 case 32000: 402 addcntrl |= (0x1 << 1); 403 break; 404 case 44100: 405 case 48000: 406 break; 407 } 408 ret = snd_soc_write(codec, WM8940_ADDCNTRL, addcntrl); 409 if (ret) 410 goto error_ret; 411 412 switch (params_format(params)) { 413 case SNDRV_PCM_FORMAT_S8: 414 companding = companding | (1 << 5); 415 break; 416 case SNDRV_PCM_FORMAT_S16_LE: 417 break; 418 case SNDRV_PCM_FORMAT_S20_3LE: 419 iface |= (1 << 5); 420 break; 421 case SNDRV_PCM_FORMAT_S24_LE: 422 iface |= (2 << 5); 423 break; 424 case SNDRV_PCM_FORMAT_S32_LE: 425 iface |= (3 << 5); 426 break; 427 } 428 ret = snd_soc_write(codec, WM8940_COMPANDINGCTL, companding); 429 if (ret) 430 goto error_ret; 431 ret = snd_soc_write(codec, WM8940_IFACE, iface); 432 433 error_ret: 434 return ret; 435 } 436 437 static int wm8940_mute(struct snd_soc_dai *dai, int mute) 438 { 439 struct snd_soc_codec *codec = dai->codec; 440 u16 mute_reg = snd_soc_read(codec, WM8940_DAC) & 0xffbf; 441 442 if (mute) 443 mute_reg |= 0x40; 444 445 return snd_soc_write(codec, WM8940_DAC, mute_reg); 446 } 447 448 static int wm8940_set_bias_level(struct snd_soc_codec *codec, 449 enum snd_soc_bias_level level) 450 { 451 u16 val; 452 u16 pwr_reg = snd_soc_read(codec, WM8940_POWER1) & 0x1F0; 453 int ret = 0; 454 455 switch (level) { 456 case SND_SOC_BIAS_ON: 457 /* ensure bufioen and biasen */ 458 pwr_reg |= (1 << 2) | (1 << 3); 459 /* Enable thermal shutdown */ 460 val = snd_soc_read(codec, WM8940_OUTPUTCTL); 461 ret = snd_soc_write(codec, WM8940_OUTPUTCTL, val | 0x2); 462 if (ret) 463 break; 464 /* set vmid to 75k */ 465 ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg | 0x1); 466 break; 467 case SND_SOC_BIAS_PREPARE: 468 /* ensure bufioen and biasen */ 469 pwr_reg |= (1 << 2) | (1 << 3); 470 ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg | 0x1); 471 break; 472 case SND_SOC_BIAS_STANDBY: 473 if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) { 474 ret = snd_soc_cache_sync(codec); 475 if (ret < 0) { 476 dev_err(codec->dev, "Failed to sync cache: %d\n", ret); 477 return ret; 478 } 479 } 480 481 /* ensure bufioen and biasen */ 482 pwr_reg |= (1 << 2) | (1 << 3); 483 /* set vmid to 300k for standby */ 484 ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg | 0x2); 485 break; 486 case SND_SOC_BIAS_OFF: 487 ret = snd_soc_write(codec, WM8940_POWER1, pwr_reg); 488 break; 489 } 490 491 codec->dapm.bias_level = level; 492 493 return ret; 494 } 495 496 struct pll_ { 497 unsigned int pre_scale:2; 498 unsigned int n:4; 499 unsigned int k; 500 }; 501 502 static struct pll_ pll_div; 503 504 /* The size in bits of the pll divide multiplied by 10 505 * to allow rounding later */ 506 #define FIXED_PLL_SIZE ((1 << 24) * 10) 507 static void pll_factors(unsigned int target, unsigned int source) 508 { 509 unsigned long long Kpart; 510 unsigned int K, Ndiv, Nmod; 511 /* The left shift ist to avoid accuracy loss when right shifting */ 512 Ndiv = target / source; 513 514 if (Ndiv > 12) { 515 source <<= 1; 516 /* Multiply by 2 */ 517 pll_div.pre_scale = 0; 518 Ndiv = target / source; 519 } else if (Ndiv < 3) { 520 source >>= 2; 521 /* Divide by 4 */ 522 pll_div.pre_scale = 3; 523 Ndiv = target / source; 524 } else if (Ndiv < 6) { 525 source >>= 1; 526 /* divide by 2 */ 527 pll_div.pre_scale = 2; 528 Ndiv = target / source; 529 } else 530 pll_div.pre_scale = 1; 531 532 if ((Ndiv < 6) || (Ndiv > 12)) 533 printk(KERN_WARNING 534 "WM8940 N value %d outwith recommended range!d\n", 535 Ndiv); 536 537 pll_div.n = Ndiv; 538 Nmod = target % source; 539 Kpart = FIXED_PLL_SIZE * (long long)Nmod; 540 541 do_div(Kpart, source); 542 543 K = Kpart & 0xFFFFFFFF; 544 545 /* Check if we need to round */ 546 if ((K % 10) >= 5) 547 K += 5; 548 549 /* Move down to proper range now rounding is done */ 550 K /= 10; 551 552 pll_div.k = K; 553 } 554 555 /* Untested at the moment */ 556 static int wm8940_set_dai_pll(struct snd_soc_dai *codec_dai, int pll_id, 557 int source, unsigned int freq_in, unsigned int freq_out) 558 { 559 struct snd_soc_codec *codec = codec_dai->codec; 560 u16 reg; 561 562 /* Turn off PLL */ 563 reg = snd_soc_read(codec, WM8940_POWER1); 564 snd_soc_write(codec, WM8940_POWER1, reg & 0x1df); 565 566 if (freq_in == 0 || freq_out == 0) { 567 /* Clock CODEC directly from MCLK */ 568 reg = snd_soc_read(codec, WM8940_CLOCK); 569 snd_soc_write(codec, WM8940_CLOCK, reg & 0x0ff); 570 /* Pll power down */ 571 snd_soc_write(codec, WM8940_PLLN, (1 << 7)); 572 return 0; 573 } 574 575 /* Pll is followed by a frequency divide by 4 */ 576 pll_factors(freq_out*4, freq_in); 577 if (pll_div.k) 578 snd_soc_write(codec, WM8940_PLLN, 579 (pll_div.pre_scale << 4) | pll_div.n | (1 << 6)); 580 else /* No factional component */ 581 snd_soc_write(codec, WM8940_PLLN, 582 (pll_div.pre_scale << 4) | pll_div.n); 583 snd_soc_write(codec, WM8940_PLLK1, pll_div.k >> 18); 584 snd_soc_write(codec, WM8940_PLLK2, (pll_div.k >> 9) & 0x1ff); 585 snd_soc_write(codec, WM8940_PLLK3, pll_div.k & 0x1ff); 586 /* Enable the PLL */ 587 reg = snd_soc_read(codec, WM8940_POWER1); 588 snd_soc_write(codec, WM8940_POWER1, reg | 0x020); 589 590 /* Run CODEC from PLL instead of MCLK */ 591 reg = snd_soc_read(codec, WM8940_CLOCK); 592 snd_soc_write(codec, WM8940_CLOCK, reg | 0x100); 593 594 return 0; 595 } 596 597 static int wm8940_set_dai_sysclk(struct snd_soc_dai *codec_dai, 598 int clk_id, unsigned int freq, int dir) 599 { 600 struct snd_soc_codec *codec = codec_dai->codec; 601 struct wm8940_priv *wm8940 = snd_soc_codec_get_drvdata(codec); 602 603 switch (freq) { 604 case 11289600: 605 case 12000000: 606 case 12288000: 607 case 16934400: 608 case 18432000: 609 wm8940->sysclk = freq; 610 return 0; 611 } 612 return -EINVAL; 613 } 614 615 static int wm8940_set_dai_clkdiv(struct snd_soc_dai *codec_dai, 616 int div_id, int div) 617 { 618 struct snd_soc_codec *codec = codec_dai->codec; 619 u16 reg; 620 int ret = 0; 621 622 switch (div_id) { 623 case WM8940_BCLKDIV: 624 reg = snd_soc_read(codec, WM8940_CLOCK) & 0xFFE3; 625 ret = snd_soc_write(codec, WM8940_CLOCK, reg | (div << 2)); 626 break; 627 case WM8940_MCLKDIV: 628 reg = snd_soc_read(codec, WM8940_CLOCK) & 0xFF1F; 629 ret = snd_soc_write(codec, WM8940_CLOCK, reg | (div << 5)); 630 break; 631 case WM8940_OPCLKDIV: 632 reg = snd_soc_read(codec, WM8940_ADDCNTRL) & 0xFFCF; 633 ret = snd_soc_write(codec, WM8940_ADDCNTRL, reg | (div << 4)); 634 break; 635 } 636 return ret; 637 } 638 639 #define WM8940_RATES SNDRV_PCM_RATE_8000_48000 640 641 #define WM8940_FORMATS (SNDRV_PCM_FMTBIT_S8 | \ 642 SNDRV_PCM_FMTBIT_S16_LE | \ 643 SNDRV_PCM_FMTBIT_S20_3LE | \ 644 SNDRV_PCM_FMTBIT_S24_LE | \ 645 SNDRV_PCM_FMTBIT_S32_LE) 646 647 static struct snd_soc_dai_ops wm8940_dai_ops = { 648 .hw_params = wm8940_i2s_hw_params, 649 .set_sysclk = wm8940_set_dai_sysclk, 650 .digital_mute = wm8940_mute, 651 .set_fmt = wm8940_set_dai_fmt, 652 .set_clkdiv = wm8940_set_dai_clkdiv, 653 .set_pll = wm8940_set_dai_pll, 654 }; 655 656 static struct snd_soc_dai_driver wm8940_dai = { 657 .name = "wm8940-hifi", 658 .playback = { 659 .stream_name = "Playback", 660 .channels_min = 1, 661 .channels_max = 2, 662 .rates = WM8940_RATES, 663 .formats = WM8940_FORMATS, 664 }, 665 .capture = { 666 .stream_name = "Capture", 667 .channels_min = 1, 668 .channels_max = 2, 669 .rates = WM8940_RATES, 670 .formats = WM8940_FORMATS, 671 }, 672 .ops = &wm8940_dai_ops, 673 .symmetric_rates = 1, 674 }; 675 676 static int wm8940_suspend(struct snd_soc_codec *codec, pm_message_t state) 677 { 678 return wm8940_set_bias_level(codec, SND_SOC_BIAS_OFF); 679 } 680 681 static int wm8940_resume(struct snd_soc_codec *codec) 682 { 683 wm8940_set_bias_level(codec, SND_SOC_BIAS_STANDBY); 684 return 0; 685 } 686 687 static int wm8940_probe(struct snd_soc_codec *codec) 688 { 689 struct wm8940_priv *wm8940 = snd_soc_codec_get_drvdata(codec); 690 struct wm8940_setup_data *pdata = codec->dev->platform_data; 691 int ret; 692 u16 reg; 693 694 ret = snd_soc_codec_set_cache_io(codec, 8, 16, wm8940->control_type); 695 if (ret < 0) { 696 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret); 697 return ret; 698 } 699 700 ret = wm8940_reset(codec); 701 if (ret < 0) { 702 dev_err(codec->dev, "Failed to issue reset\n"); 703 return ret; 704 } 705 706 wm8940_set_bias_level(codec, SND_SOC_BIAS_STANDBY); 707 708 ret = snd_soc_write(codec, WM8940_POWER1, 0x180); 709 if (ret < 0) 710 return ret; 711 712 if (!pdata) 713 dev_warn(codec->dev, "No platform data supplied\n"); 714 else { 715 reg = snd_soc_read(codec, WM8940_OUTPUTCTL); 716 ret = snd_soc_write(codec, WM8940_OUTPUTCTL, reg | pdata->vroi); 717 if (ret < 0) 718 return ret; 719 } 720 721 ret = snd_soc_add_controls(codec, wm8940_snd_controls, 722 ARRAY_SIZE(wm8940_snd_controls)); 723 if (ret) 724 return ret; 725 ret = wm8940_add_widgets(codec); 726 return ret; 727 } 728 729 static int wm8940_remove(struct snd_soc_codec *codec) 730 { 731 wm8940_set_bias_level(codec, SND_SOC_BIAS_OFF); 732 return 0; 733 } 734 735 static struct snd_soc_codec_driver soc_codec_dev_wm8940 = { 736 .probe = wm8940_probe, 737 .remove = wm8940_remove, 738 .suspend = wm8940_suspend, 739 .resume = wm8940_resume, 740 .set_bias_level = wm8940_set_bias_level, 741 .reg_cache_size = ARRAY_SIZE(wm8940_reg_defaults), 742 .reg_word_size = sizeof(u16), 743 .reg_cache_default = wm8940_reg_defaults, 744 .volatile_register = wm8940_volatile_register, 745 }; 746 747 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 748 static __devinit int wm8940_i2c_probe(struct i2c_client *i2c, 749 const struct i2c_device_id *id) 750 { 751 struct wm8940_priv *wm8940; 752 int ret; 753 754 wm8940 = kzalloc(sizeof(struct wm8940_priv), GFP_KERNEL); 755 if (wm8940 == NULL) 756 return -ENOMEM; 757 758 i2c_set_clientdata(i2c, wm8940); 759 wm8940->control_type = SND_SOC_I2C; 760 761 ret = snd_soc_register_codec(&i2c->dev, 762 &soc_codec_dev_wm8940, &wm8940_dai, 1); 763 if (ret < 0) 764 kfree(wm8940); 765 return ret; 766 } 767 768 static __devexit int wm8940_i2c_remove(struct i2c_client *client) 769 { 770 snd_soc_unregister_codec(&client->dev); 771 kfree(i2c_get_clientdata(client)); 772 return 0; 773 } 774 775 static const struct i2c_device_id wm8940_i2c_id[] = { 776 { "wm8940", 0 }, 777 { } 778 }; 779 MODULE_DEVICE_TABLE(i2c, wm8940_i2c_id); 780 781 static struct i2c_driver wm8940_i2c_driver = { 782 .driver = { 783 .name = "wm8940-codec", 784 .owner = THIS_MODULE, 785 }, 786 .probe = wm8940_i2c_probe, 787 .remove = __devexit_p(wm8940_i2c_remove), 788 .id_table = wm8940_i2c_id, 789 }; 790 #endif 791 792 static int __init wm8940_modinit(void) 793 { 794 int ret = 0; 795 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 796 ret = i2c_add_driver(&wm8940_i2c_driver); 797 if (ret != 0) { 798 printk(KERN_ERR "Failed to register wm8940 I2C driver: %d\n", 799 ret); 800 } 801 #endif 802 return ret; 803 } 804 module_init(wm8940_modinit); 805 806 static void __exit wm8940_exit(void) 807 { 808 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 809 i2c_del_driver(&wm8940_i2c_driver); 810 #endif 811 } 812 module_exit(wm8940_exit); 813 814 MODULE_DESCRIPTION("ASoC WM8940 driver"); 815 MODULE_AUTHOR("Jonathan Cameron"); 816 MODULE_LICENSE("GPL"); 817