1 /* 2 * wm8978.c -- WM8978 ALSA SoC Audio Codec driver 3 * 4 * Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de> 5 * Copyright (C) 2007 Carlos Munoz <carlos@kenati.com> 6 * Copyright 2006-2009 Wolfson Microelectronics PLC. 7 * Based on wm8974 and wm8990 by Liam Girdwood <lrg@slimlogic.co.uk> 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/kernel.h> 17 #include <linux/init.h> 18 #include <linux/delay.h> 19 #include <linux/pm.h> 20 #include <linux/i2c.h> 21 #include <linux/platform_device.h> 22 #include <linux/slab.h> 23 #include <sound/core.h> 24 #include <sound/pcm.h> 25 #include <sound/pcm_params.h> 26 #include <sound/soc.h> 27 #include <sound/soc-dapm.h> 28 #include <sound/initval.h> 29 #include <sound/tlv.h> 30 #include <asm/div64.h> 31 32 #include "wm8978.h" 33 34 static struct snd_soc_codec *wm8978_codec; 35 36 /* wm8978 register cache. Note that register 0 is not included in the cache. */ 37 static const u16 wm8978_reg[WM8978_CACHEREGNUM] = { 38 0x0000, 0x0000, 0x0000, 0x0000, /* 0x00...0x03 */ 39 0x0050, 0x0000, 0x0140, 0x0000, /* 0x04...0x07 */ 40 0x0000, 0x0000, 0x0000, 0x00ff, /* 0x08...0x0b */ 41 0x00ff, 0x0000, 0x0100, 0x00ff, /* 0x0c...0x0f */ 42 0x00ff, 0x0000, 0x012c, 0x002c, /* 0x10...0x13 */ 43 0x002c, 0x002c, 0x002c, 0x0000, /* 0x14...0x17 */ 44 0x0032, 0x0000, 0x0000, 0x0000, /* 0x18...0x1b */ 45 0x0000, 0x0000, 0x0000, 0x0000, /* 0x1c...0x1f */ 46 0x0038, 0x000b, 0x0032, 0x0000, /* 0x20...0x23 */ 47 0x0008, 0x000c, 0x0093, 0x00e9, /* 0x24...0x27 */ 48 0x0000, 0x0000, 0x0000, 0x0000, /* 0x28...0x2b */ 49 0x0033, 0x0010, 0x0010, 0x0100, /* 0x2c...0x2f */ 50 0x0100, 0x0002, 0x0001, 0x0001, /* 0x30...0x33 */ 51 0x0039, 0x0039, 0x0039, 0x0039, /* 0x34...0x37 */ 52 0x0001, 0x0001, /* 0x38...0x3b */ 53 }; 54 55 /* codec private data */ 56 struct wm8978_priv { 57 struct snd_soc_codec codec; 58 unsigned int f_pllout; 59 unsigned int f_mclk; 60 unsigned int f_256fs; 61 unsigned int f_opclk; 62 int mclk_idx; 63 enum wm8978_sysclk_src sysclk; 64 u16 reg_cache[WM8978_CACHEREGNUM]; 65 }; 66 67 static const char *wm8978_companding[] = {"Off", "NC", "u-law", "A-law"}; 68 static const char *wm8978_eqmode[] = {"Capture", "Playback"}; 69 static const char *wm8978_bw[] = {"Narrow", "Wide"}; 70 static const char *wm8978_eq1[] = {"80Hz", "105Hz", "135Hz", "175Hz"}; 71 static const char *wm8978_eq2[] = {"230Hz", "300Hz", "385Hz", "500Hz"}; 72 static const char *wm8978_eq3[] = {"650Hz", "850Hz", "1.1kHz", "1.4kHz"}; 73 static const char *wm8978_eq4[] = {"1.8kHz", "2.4kHz", "3.2kHz", "4.1kHz"}; 74 static const char *wm8978_eq5[] = {"5.3kHz", "6.9kHz", "9kHz", "11.7kHz"}; 75 static const char *wm8978_alc3[] = {"ALC", "Limiter"}; 76 static const char *wm8978_alc1[] = {"Off", "Right", "Left", "Both"}; 77 78 static const SOC_ENUM_SINGLE_DECL(adc_compand, WM8978_COMPANDING_CONTROL, 1, 79 wm8978_companding); 80 static const SOC_ENUM_SINGLE_DECL(dac_compand, WM8978_COMPANDING_CONTROL, 3, 81 wm8978_companding); 82 static const SOC_ENUM_SINGLE_DECL(eqmode, WM8978_EQ1, 8, wm8978_eqmode); 83 static const SOC_ENUM_SINGLE_DECL(eq1, WM8978_EQ1, 5, wm8978_eq1); 84 static const SOC_ENUM_SINGLE_DECL(eq2bw, WM8978_EQ2, 8, wm8978_bw); 85 static const SOC_ENUM_SINGLE_DECL(eq2, WM8978_EQ2, 5, wm8978_eq2); 86 static const SOC_ENUM_SINGLE_DECL(eq3bw, WM8978_EQ3, 8, wm8978_bw); 87 static const SOC_ENUM_SINGLE_DECL(eq3, WM8978_EQ3, 5, wm8978_eq3); 88 static const SOC_ENUM_SINGLE_DECL(eq4bw, WM8978_EQ4, 8, wm8978_bw); 89 static const SOC_ENUM_SINGLE_DECL(eq4, WM8978_EQ4, 5, wm8978_eq4); 90 static const SOC_ENUM_SINGLE_DECL(eq5, WM8978_EQ5, 5, wm8978_eq5); 91 static const SOC_ENUM_SINGLE_DECL(alc3, WM8978_ALC_CONTROL_3, 8, wm8978_alc3); 92 static const SOC_ENUM_SINGLE_DECL(alc1, WM8978_ALC_CONTROL_1, 7, wm8978_alc1); 93 94 static const DECLARE_TLV_DB_SCALE(digital_tlv, -12750, 50, 1); 95 static const DECLARE_TLV_DB_SCALE(eq_tlv, -1200, 100, 0); 96 static const DECLARE_TLV_DB_SCALE(inpga_tlv, -1200, 75, 0); 97 static const DECLARE_TLV_DB_SCALE(spk_tlv, -5700, 100, 0); 98 static const DECLARE_TLV_DB_SCALE(boost_tlv, -1500, 300, 1); 99 100 static const struct snd_kcontrol_new wm8978_snd_controls[] = { 101 102 SOC_SINGLE("Digital Loopback Switch", 103 WM8978_COMPANDING_CONTROL, 0, 1, 0), 104 105 SOC_ENUM("ADC Companding", adc_compand), 106 SOC_ENUM("DAC Companding", dac_compand), 107 108 SOC_DOUBLE("DAC Inversion Switch", WM8978_DAC_CONTROL, 0, 1, 1, 0), 109 110 SOC_DOUBLE_R_TLV("PCM Volume", 111 WM8978_LEFT_DAC_DIGITAL_VOLUME, WM8978_RIGHT_DAC_DIGITAL_VOLUME, 112 0, 255, 0, digital_tlv), 113 114 SOC_SINGLE("High Pass Filter Switch", WM8978_ADC_CONTROL, 8, 1, 0), 115 SOC_SINGLE("High Pass Cut Off", WM8978_ADC_CONTROL, 4, 7, 0), 116 SOC_DOUBLE("ADC Inversion Switch", WM8978_ADC_CONTROL, 0, 1, 1, 0), 117 118 SOC_DOUBLE_R_TLV("ADC Volume", 119 WM8978_LEFT_ADC_DIGITAL_VOLUME, WM8978_RIGHT_ADC_DIGITAL_VOLUME, 120 0, 255, 0, digital_tlv), 121 122 SOC_ENUM("Equaliser Function", eqmode), 123 SOC_ENUM("EQ1 Cut Off", eq1), 124 SOC_SINGLE_TLV("EQ1 Volume", WM8978_EQ1, 0, 24, 1, eq_tlv), 125 126 SOC_ENUM("Equaliser EQ2 Bandwith", eq2bw), 127 SOC_ENUM("EQ2 Cut Off", eq2), 128 SOC_SINGLE_TLV("EQ2 Volume", WM8978_EQ2, 0, 24, 1, eq_tlv), 129 130 SOC_ENUM("Equaliser EQ3 Bandwith", eq3bw), 131 SOC_ENUM("EQ3 Cut Off", eq3), 132 SOC_SINGLE_TLV("EQ3 Volume", WM8978_EQ3, 0, 24, 1, eq_tlv), 133 134 SOC_ENUM("Equaliser EQ4 Bandwith", eq4bw), 135 SOC_ENUM("EQ4 Cut Off", eq4), 136 SOC_SINGLE_TLV("EQ4 Volume", WM8978_EQ4, 0, 24, 1, eq_tlv), 137 138 SOC_ENUM("EQ5 Cut Off", eq5), 139 SOC_SINGLE_TLV("EQ5 Volume", WM8978_EQ5, 0, 24, 1, eq_tlv), 140 141 SOC_SINGLE("DAC Playback Limiter Switch", 142 WM8978_DAC_LIMITER_1, 8, 1, 0), 143 SOC_SINGLE("DAC Playback Limiter Decay", 144 WM8978_DAC_LIMITER_1, 4, 15, 0), 145 SOC_SINGLE("DAC Playback Limiter Attack", 146 WM8978_DAC_LIMITER_1, 0, 15, 0), 147 148 SOC_SINGLE("DAC Playback Limiter Threshold", 149 WM8978_DAC_LIMITER_2, 4, 7, 0), 150 SOC_SINGLE("DAC Playback Limiter Boost", 151 WM8978_DAC_LIMITER_2, 0, 15, 0), 152 153 SOC_ENUM("ALC Enable Switch", alc1), 154 SOC_SINGLE("ALC Capture Min Gain", WM8978_ALC_CONTROL_1, 0, 7, 0), 155 SOC_SINGLE("ALC Capture Max Gain", WM8978_ALC_CONTROL_1, 3, 7, 0), 156 157 SOC_SINGLE("ALC Capture Hold", WM8978_ALC_CONTROL_2, 4, 7, 0), 158 SOC_SINGLE("ALC Capture Target", WM8978_ALC_CONTROL_2, 0, 15, 0), 159 160 SOC_ENUM("ALC Capture Mode", alc3), 161 SOC_SINGLE("ALC Capture Decay", WM8978_ALC_CONTROL_3, 4, 15, 0), 162 SOC_SINGLE("ALC Capture Attack", WM8978_ALC_CONTROL_3, 0, 15, 0), 163 164 SOC_SINGLE("ALC Capture Noise Gate Switch", WM8978_NOISE_GATE, 3, 1, 0), 165 SOC_SINGLE("ALC Capture Noise Gate Threshold", 166 WM8978_NOISE_GATE, 0, 7, 0), 167 168 SOC_DOUBLE_R("Capture PGA ZC Switch", 169 WM8978_LEFT_INP_PGA_CONTROL, WM8978_RIGHT_INP_PGA_CONTROL, 170 7, 1, 0), 171 172 /* OUT1 - Headphones */ 173 SOC_DOUBLE_R("Headphone Playback ZC Switch", 174 WM8978_LOUT1_HP_CONTROL, WM8978_ROUT1_HP_CONTROL, 7, 1, 0), 175 176 SOC_DOUBLE_R_TLV("Headphone Playback Volume", 177 WM8978_LOUT1_HP_CONTROL, WM8978_ROUT1_HP_CONTROL, 178 0, 63, 0, spk_tlv), 179 180 /* OUT2 - Speakers */ 181 SOC_DOUBLE_R("Speaker Playback ZC Switch", 182 WM8978_LOUT2_SPK_CONTROL, WM8978_ROUT2_SPK_CONTROL, 7, 1, 0), 183 184 SOC_DOUBLE_R_TLV("Speaker Playback Volume", 185 WM8978_LOUT2_SPK_CONTROL, WM8978_ROUT2_SPK_CONTROL, 186 0, 63, 0, spk_tlv), 187 188 /* OUT3/4 - Line Output */ 189 SOC_DOUBLE_R("Line Playback Switch", 190 WM8978_OUT3_MIXER_CONTROL, WM8978_OUT4_MIXER_CONTROL, 6, 1, 1), 191 192 /* Mixer #3: Boost (Input) mixer */ 193 SOC_DOUBLE_R("PGA Boost (+20dB)", 194 WM8978_LEFT_ADC_BOOST_CONTROL, WM8978_RIGHT_ADC_BOOST_CONTROL, 195 8, 1, 0), 196 SOC_DOUBLE_R_TLV("L2/R2 Boost Volume", 197 WM8978_LEFT_ADC_BOOST_CONTROL, WM8978_RIGHT_ADC_BOOST_CONTROL, 198 4, 7, 0, boost_tlv), 199 SOC_DOUBLE_R_TLV("Aux Boost Volume", 200 WM8978_LEFT_ADC_BOOST_CONTROL, WM8978_RIGHT_ADC_BOOST_CONTROL, 201 0, 7, 0, boost_tlv), 202 203 /* Input PGA volume */ 204 SOC_DOUBLE_R_TLV("Input PGA Volume", 205 WM8978_LEFT_INP_PGA_CONTROL, WM8978_RIGHT_INP_PGA_CONTROL, 206 0, 63, 0, inpga_tlv), 207 208 /* Headphone */ 209 SOC_DOUBLE_R("Headphone Switch", 210 WM8978_LOUT1_HP_CONTROL, WM8978_ROUT1_HP_CONTROL, 6, 1, 1), 211 212 /* Speaker */ 213 SOC_DOUBLE_R("Speaker Switch", 214 WM8978_LOUT2_SPK_CONTROL, WM8978_ROUT2_SPK_CONTROL, 6, 1, 1), 215 216 /* DAC / ADC oversampling */ 217 SOC_SINGLE("DAC 128x Oversampling Switch", WM8978_DAC_CONTROL, 8, 1, 0), 218 SOC_SINGLE("ADC 128x Oversampling Switch", WM8978_ADC_CONTROL, 8, 1, 0), 219 }; 220 221 /* Mixer #1: Output (OUT1, OUT2) Mixer: mix AUX, Input mixer output and DAC */ 222 static const struct snd_kcontrol_new wm8978_left_out_mixer[] = { 223 SOC_DAPM_SINGLE("Line Bypass Switch", WM8978_LEFT_MIXER_CONTROL, 1, 1, 0), 224 SOC_DAPM_SINGLE("Aux Playback Switch", WM8978_LEFT_MIXER_CONTROL, 5, 1, 0), 225 SOC_DAPM_SINGLE("PCM Playback Switch", WM8978_LEFT_MIXER_CONTROL, 0, 1, 0), 226 }; 227 228 static const struct snd_kcontrol_new wm8978_right_out_mixer[] = { 229 SOC_DAPM_SINGLE("Line Bypass Switch", WM8978_RIGHT_MIXER_CONTROL, 1, 1, 0), 230 SOC_DAPM_SINGLE("Aux Playback Switch", WM8978_RIGHT_MIXER_CONTROL, 5, 1, 0), 231 SOC_DAPM_SINGLE("PCM Playback Switch", WM8978_RIGHT_MIXER_CONTROL, 0, 1, 0), 232 }; 233 234 /* OUT3/OUT4 Mixer not implemented */ 235 236 /* Mixer #2: Input PGA Mute */ 237 static const struct snd_kcontrol_new wm8978_left_input_mixer[] = { 238 SOC_DAPM_SINGLE("L2 Switch", WM8978_INPUT_CONTROL, 2, 1, 0), 239 SOC_DAPM_SINGLE("MicN Switch", WM8978_INPUT_CONTROL, 1, 1, 0), 240 SOC_DAPM_SINGLE("MicP Switch", WM8978_INPUT_CONTROL, 0, 1, 0), 241 }; 242 static const struct snd_kcontrol_new wm8978_right_input_mixer[] = { 243 SOC_DAPM_SINGLE("R2 Switch", WM8978_INPUT_CONTROL, 6, 1, 0), 244 SOC_DAPM_SINGLE("MicN Switch", WM8978_INPUT_CONTROL, 5, 1, 0), 245 SOC_DAPM_SINGLE("MicP Switch", WM8978_INPUT_CONTROL, 4, 1, 0), 246 }; 247 248 static const struct snd_soc_dapm_widget wm8978_dapm_widgets[] = { 249 SND_SOC_DAPM_DAC("Left DAC", "Left HiFi Playback", 250 WM8978_POWER_MANAGEMENT_3, 0, 0), 251 SND_SOC_DAPM_DAC("Right DAC", "Right HiFi Playback", 252 WM8978_POWER_MANAGEMENT_3, 1, 0), 253 SND_SOC_DAPM_ADC("Left ADC", "Left HiFi Capture", 254 WM8978_POWER_MANAGEMENT_2, 0, 0), 255 SND_SOC_DAPM_ADC("Right ADC", "Right HiFi Capture", 256 WM8978_POWER_MANAGEMENT_2, 1, 0), 257 258 /* Mixer #1: OUT1,2 */ 259 SOC_MIXER_ARRAY("Left Output Mixer", WM8978_POWER_MANAGEMENT_3, 260 2, 0, wm8978_left_out_mixer), 261 SOC_MIXER_ARRAY("Right Output Mixer", WM8978_POWER_MANAGEMENT_3, 262 3, 0, wm8978_right_out_mixer), 263 264 SOC_MIXER_ARRAY("Left Input Mixer", WM8978_POWER_MANAGEMENT_2, 265 2, 0, wm8978_left_input_mixer), 266 SOC_MIXER_ARRAY("Right Input Mixer", WM8978_POWER_MANAGEMENT_2, 267 3, 0, wm8978_right_input_mixer), 268 269 SND_SOC_DAPM_PGA("Left Boost Mixer", WM8978_POWER_MANAGEMENT_2, 270 4, 0, NULL, 0), 271 SND_SOC_DAPM_PGA("Right Boost Mixer", WM8978_POWER_MANAGEMENT_2, 272 5, 0, NULL, 0), 273 274 SND_SOC_DAPM_PGA("Left Capture PGA", WM8978_LEFT_INP_PGA_CONTROL, 275 6, 1, NULL, 0), 276 SND_SOC_DAPM_PGA("Right Capture PGA", WM8978_RIGHT_INP_PGA_CONTROL, 277 6, 1, NULL, 0), 278 279 SND_SOC_DAPM_PGA("Left Headphone Out", WM8978_POWER_MANAGEMENT_2, 280 7, 0, NULL, 0), 281 SND_SOC_DAPM_PGA("Right Headphone Out", WM8978_POWER_MANAGEMENT_2, 282 8, 0, NULL, 0), 283 284 SND_SOC_DAPM_PGA("Left Speaker Out", WM8978_POWER_MANAGEMENT_3, 285 6, 0, NULL, 0), 286 SND_SOC_DAPM_PGA("Right Speaker Out", WM8978_POWER_MANAGEMENT_3, 287 5, 0, NULL, 0), 288 289 SND_SOC_DAPM_MIXER("OUT4 VMID", WM8978_POWER_MANAGEMENT_3, 290 8, 0, NULL, 0), 291 292 SND_SOC_DAPM_MICBIAS("Mic Bias", WM8978_POWER_MANAGEMENT_1, 4, 0), 293 294 SND_SOC_DAPM_INPUT("LMICN"), 295 SND_SOC_DAPM_INPUT("LMICP"), 296 SND_SOC_DAPM_INPUT("RMICN"), 297 SND_SOC_DAPM_INPUT("RMICP"), 298 SND_SOC_DAPM_INPUT("LAUX"), 299 SND_SOC_DAPM_INPUT("RAUX"), 300 SND_SOC_DAPM_INPUT("L2"), 301 SND_SOC_DAPM_INPUT("R2"), 302 SND_SOC_DAPM_OUTPUT("LHP"), 303 SND_SOC_DAPM_OUTPUT("RHP"), 304 SND_SOC_DAPM_OUTPUT("LSPK"), 305 SND_SOC_DAPM_OUTPUT("RSPK"), 306 }; 307 308 static const struct snd_soc_dapm_route audio_map[] = { 309 /* Output mixer */ 310 {"Right Output Mixer", "PCM Playback Switch", "Right DAC"}, 311 {"Right Output Mixer", "Aux Playback Switch", "RAUX"}, 312 {"Right Output Mixer", "Line Bypass Switch", "Right Boost Mixer"}, 313 314 {"Left Output Mixer", "PCM Playback Switch", "Left DAC"}, 315 {"Left Output Mixer", "Aux Playback Switch", "LAUX"}, 316 {"Left Output Mixer", "Line Bypass Switch", "Left Boost Mixer"}, 317 318 /* Outputs */ 319 {"Right Headphone Out", NULL, "Right Output Mixer"}, 320 {"RHP", NULL, "Right Headphone Out"}, 321 322 {"Left Headphone Out", NULL, "Left Output Mixer"}, 323 {"LHP", NULL, "Left Headphone Out"}, 324 325 {"Right Speaker Out", NULL, "Right Output Mixer"}, 326 {"RSPK", NULL, "Right Speaker Out"}, 327 328 {"Left Speaker Out", NULL, "Left Output Mixer"}, 329 {"LSPK", NULL, "Left Speaker Out"}, 330 331 /* Boost Mixer */ 332 {"Right ADC", NULL, "Right Boost Mixer"}, 333 334 {"Right Boost Mixer", NULL, "RAUX"}, 335 {"Right Boost Mixer", NULL, "Right Capture PGA"}, 336 {"Right Boost Mixer", NULL, "R2"}, 337 338 {"Left ADC", NULL, "Left Boost Mixer"}, 339 340 {"Left Boost Mixer", NULL, "LAUX"}, 341 {"Left Boost Mixer", NULL, "Left Capture PGA"}, 342 {"Left Boost Mixer", NULL, "L2"}, 343 344 /* Input PGA */ 345 {"Right Capture PGA", NULL, "Right Input Mixer"}, 346 {"Left Capture PGA", NULL, "Left Input Mixer"}, 347 348 {"Right Input Mixer", "R2 Switch", "R2"}, 349 {"Right Input Mixer", "MicN Switch", "RMICN"}, 350 {"Right Input Mixer", "MicP Switch", "RMICP"}, 351 352 {"Left Input Mixer", "L2 Switch", "L2"}, 353 {"Left Input Mixer", "MicN Switch", "LMICN"}, 354 {"Left Input Mixer", "MicP Switch", "LMICP"}, 355 }; 356 357 static int wm8978_add_widgets(struct snd_soc_codec *codec) 358 { 359 snd_soc_dapm_new_controls(codec, wm8978_dapm_widgets, 360 ARRAY_SIZE(wm8978_dapm_widgets)); 361 362 /* set up the WM8978 audio map */ 363 snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map)); 364 365 return 0; 366 } 367 368 /* PLL divisors */ 369 struct wm8978_pll_div { 370 u32 k; 371 u8 n; 372 u8 div2; 373 }; 374 375 #define FIXED_PLL_SIZE (1 << 24) 376 377 static void pll_factors(struct wm8978_pll_div *pll_div, unsigned int target, 378 unsigned int source) 379 { 380 u64 k_part; 381 unsigned int k, n_div, n_mod; 382 383 n_div = target / source; 384 if (n_div < 6) { 385 source >>= 1; 386 pll_div->div2 = 1; 387 n_div = target / source; 388 } else { 389 pll_div->div2 = 0; 390 } 391 392 if (n_div < 6 || n_div > 12) 393 dev_warn(wm8978_codec->dev, 394 "WM8978 N value exceeds recommended range! N = %u\n", 395 n_div); 396 397 pll_div->n = n_div; 398 n_mod = target - source * n_div; 399 k_part = FIXED_PLL_SIZE * (long long)n_mod + source / 2; 400 401 do_div(k_part, source); 402 403 k = k_part & 0xFFFFFFFF; 404 405 pll_div->k = k; 406 } 407 408 /* MCLK dividers */ 409 static const int mclk_numerator[] = {1, 3, 2, 3, 4, 6, 8, 12}; 410 static const int mclk_denominator[] = {1, 2, 1, 1, 1, 1, 1, 1}; 411 412 /* 413 * find index >= idx, such that, for a given f_out, 414 * 3 * f_mclk / 4 <= f_PLLOUT < 13 * f_mclk / 4 415 * f_out can be f_256fs or f_opclk, currently only used for f_256fs. Can be 416 * generalised for f_opclk with suitable coefficient arrays, but currently 417 * the OPCLK divisor is calculated directly, not iteratively. 418 */ 419 static int wm8978_enum_mclk(unsigned int f_out, unsigned int f_mclk, 420 unsigned int *f_pllout) 421 { 422 int i; 423 424 for (i = 0; i < ARRAY_SIZE(mclk_numerator); i++) { 425 unsigned int f_pllout_x4 = 4 * f_out * mclk_numerator[i] / 426 mclk_denominator[i]; 427 if (3 * f_mclk <= f_pllout_x4 && f_pllout_x4 < 13 * f_mclk) { 428 *f_pllout = f_pllout_x4 / 4; 429 return i; 430 } 431 } 432 433 return -EINVAL; 434 } 435 436 /* 437 * Calculate internal frequencies and dividers, according to Figure 40 438 * "PLL and Clock Select Circuit" in WM8978 datasheet Rev. 2.6 439 */ 440 static int wm8978_configure_pll(struct snd_soc_codec *codec) 441 { 442 struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec); 443 struct wm8978_pll_div pll_div; 444 unsigned int f_opclk = wm8978->f_opclk, f_mclk = wm8978->f_mclk, 445 f_256fs = wm8978->f_256fs; 446 unsigned int f2; 447 448 if (!f_mclk) 449 return -EINVAL; 450 451 if (f_opclk) { 452 unsigned int opclk_div; 453 /* Cannot set up MCLK divider now, do later */ 454 wm8978->mclk_idx = -1; 455 456 /* 457 * The user needs OPCLK. Choose OPCLKDIV to put 458 * 6 <= R = f2 / f1 < 13, 1 <= OPCLKDIV <= 4. 459 * f_opclk = f_mclk * prescale * R / 4 / OPCLKDIV, where 460 * prescale = 1, or prescale = 2. Prescale is calculated inside 461 * pll_factors(). We have to select f_PLLOUT, such that 462 * f_mclk * 3 / 4 <= f_PLLOUT < f_mclk * 13 / 4. Must be 463 * f_mclk * 3 / 16 <= f_opclk < f_mclk * 13 / 4. 464 */ 465 if (16 * f_opclk < 3 * f_mclk || 4 * f_opclk >= 13 * f_mclk) 466 return -EINVAL; 467 468 if (4 * f_opclk < 3 * f_mclk) 469 /* Have to use OPCLKDIV */ 470 opclk_div = (3 * f_mclk / 4 + f_opclk - 1) / f_opclk; 471 else 472 opclk_div = 1; 473 474 dev_dbg(codec->dev, "%s: OPCLKDIV=%d\n", __func__, opclk_div); 475 476 snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 0x30, 477 (opclk_div - 1) << 4); 478 479 wm8978->f_pllout = f_opclk * opclk_div; 480 } else if (f_256fs) { 481 /* 482 * Not using OPCLK, but PLL is used for the codec, choose R: 483 * 6 <= R = f2 / f1 < 13, to put 1 <= MCLKDIV <= 12. 484 * f_256fs = f_mclk * prescale * R / 4 / MCLKDIV, where 485 * prescale = 1, or prescale = 2. Prescale is calculated inside 486 * pll_factors(). We have to select f_PLLOUT, such that 487 * f_mclk * 3 / 4 <= f_PLLOUT < f_mclk * 13 / 4. Must be 488 * f_mclk * 3 / 48 <= f_256fs < f_mclk * 13 / 4. This means MCLK 489 * must be 3.781MHz <= f_MCLK <= 32.768MHz 490 */ 491 int idx = wm8978_enum_mclk(f_256fs, f_mclk, &wm8978->f_pllout); 492 if (idx < 0) 493 return idx; 494 495 wm8978->mclk_idx = idx; 496 497 /* GPIO1 into default mode as input - before configuring PLL */ 498 snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 7, 0); 499 } else { 500 return -EINVAL; 501 } 502 503 f2 = wm8978->f_pllout * 4; 504 505 dev_dbg(codec->dev, "%s: f_MCLK=%uHz, f_PLLOUT=%uHz\n", __func__, 506 wm8978->f_mclk, wm8978->f_pllout); 507 508 pll_factors(&pll_div, f2, wm8978->f_mclk); 509 510 dev_dbg(codec->dev, "%s: calculated PLL N=0x%x, K=0x%x, div2=%d\n", 511 __func__, pll_div.n, pll_div.k, pll_div.div2); 512 513 /* Turn PLL off for configuration... */ 514 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0); 515 516 snd_soc_write(codec, WM8978_PLL_N, (pll_div.div2 << 4) | pll_div.n); 517 snd_soc_write(codec, WM8978_PLL_K1, pll_div.k >> 18); 518 snd_soc_write(codec, WM8978_PLL_K2, (pll_div.k >> 9) & 0x1ff); 519 snd_soc_write(codec, WM8978_PLL_K3, pll_div.k & 0x1ff); 520 521 /* ...and on again */ 522 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0x20); 523 524 if (f_opclk) 525 /* Output PLL (OPCLK) to GPIO1 */ 526 snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 7, 4); 527 528 return 0; 529 } 530 531 /* 532 * Configure WM8978 clock dividers. 533 */ 534 static int wm8978_set_dai_clkdiv(struct snd_soc_dai *codec_dai, 535 int div_id, int div) 536 { 537 struct snd_soc_codec *codec = codec_dai->codec; 538 struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec); 539 int ret = 0; 540 541 switch (div_id) { 542 case WM8978_OPCLKRATE: 543 wm8978->f_opclk = div; 544 545 if (wm8978->f_mclk) 546 /* 547 * We know the MCLK frequency, the user has requested 548 * OPCLK, configure the PLL based on that and start it 549 * and OPCLK immediately. We will configure PLL to match 550 * user-requested OPCLK frquency as good as possible. 551 * In fact, it is likely, that matching the sampling 552 * rate, when it becomes known, is more important, and 553 * we will not be reconfiguring PLL then, because we 554 * must not interrupt OPCLK. But it should be fine, 555 * because typically the user will request OPCLK to run 556 * at 256fs or 512fs, and for these cases we will also 557 * find an exact MCLK divider configuration - it will 558 * be equal to or double the OPCLK divisor. 559 */ 560 ret = wm8978_configure_pll(codec); 561 break; 562 case WM8978_BCLKDIV: 563 if (div & ~0x1c) 564 return -EINVAL; 565 snd_soc_update_bits(codec, WM8978_CLOCKING, 0x1c, div); 566 break; 567 default: 568 return -EINVAL; 569 } 570 571 dev_dbg(codec->dev, "%s: ID %d, value %u\n", __func__, div_id, div); 572 573 return ret; 574 } 575 576 /* 577 * @freq: when .set_pll() us not used, freq is codec MCLK input frequency 578 */ 579 static int wm8978_set_dai_sysclk(struct snd_soc_dai *codec_dai, int clk_id, 580 unsigned int freq, int dir) 581 { 582 struct snd_soc_codec *codec = codec_dai->codec; 583 struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec); 584 int ret = 0; 585 586 dev_dbg(codec->dev, "%s: ID %d, freq %u\n", __func__, clk_id, freq); 587 588 if (freq) { 589 wm8978->f_mclk = freq; 590 591 /* Even if MCLK is used for system clock, might have to drive OPCLK */ 592 if (wm8978->f_opclk) 593 ret = wm8978_configure_pll(codec); 594 595 /* Our sysclk is fixed to 256 * fs, will configure in .hw_params() */ 596 597 if (!ret) 598 wm8978->sysclk = clk_id; 599 } 600 601 if (wm8978->sysclk == WM8978_PLL && (!freq || clk_id == WM8978_MCLK)) { 602 /* Clock CODEC directly from MCLK */ 603 snd_soc_update_bits(codec, WM8978_CLOCKING, 0x100, 0); 604 605 /* GPIO1 into default mode as input - before configuring PLL */ 606 snd_soc_update_bits(codec, WM8978_GPIO_CONTROL, 7, 0); 607 608 /* Turn off PLL */ 609 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0); 610 wm8978->sysclk = WM8978_MCLK; 611 wm8978->f_pllout = 0; 612 wm8978->f_opclk = 0; 613 } 614 615 return ret; 616 } 617 618 /* 619 * Set ADC and Voice DAC format. 620 */ 621 static int wm8978_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt) 622 { 623 struct snd_soc_codec *codec = codec_dai->codec; 624 /* 625 * BCLK polarity mask = 0x100, LRC clock polarity mask = 0x80, 626 * Data Format mask = 0x18: all will be calculated anew 627 */ 628 u16 iface = snd_soc_read(codec, WM8978_AUDIO_INTERFACE) & ~0x198; 629 u16 clk = snd_soc_read(codec, WM8978_CLOCKING); 630 631 dev_dbg(codec->dev, "%s\n", __func__); 632 633 /* set master/slave audio interface */ 634 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { 635 case SND_SOC_DAIFMT_CBM_CFM: 636 clk |= 1; 637 break; 638 case SND_SOC_DAIFMT_CBS_CFS: 639 clk &= ~1; 640 break; 641 default: 642 return -EINVAL; 643 } 644 645 /* interface format */ 646 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 647 case SND_SOC_DAIFMT_I2S: 648 iface |= 0x10; 649 break; 650 case SND_SOC_DAIFMT_RIGHT_J: 651 break; 652 case SND_SOC_DAIFMT_LEFT_J: 653 iface |= 0x8; 654 break; 655 case SND_SOC_DAIFMT_DSP_A: 656 iface |= 0x18; 657 break; 658 default: 659 return -EINVAL; 660 } 661 662 /* clock inversion */ 663 switch (fmt & SND_SOC_DAIFMT_INV_MASK) { 664 case SND_SOC_DAIFMT_NB_NF: 665 break; 666 case SND_SOC_DAIFMT_IB_IF: 667 iface |= 0x180; 668 break; 669 case SND_SOC_DAIFMT_IB_NF: 670 iface |= 0x100; 671 break; 672 case SND_SOC_DAIFMT_NB_IF: 673 iface |= 0x80; 674 break; 675 default: 676 return -EINVAL; 677 } 678 679 snd_soc_write(codec, WM8978_AUDIO_INTERFACE, iface); 680 snd_soc_write(codec, WM8978_CLOCKING, clk); 681 682 return 0; 683 } 684 685 /* 686 * Set PCM DAI bit size and sample rate. 687 */ 688 static int wm8978_hw_params(struct snd_pcm_substream *substream, 689 struct snd_pcm_hw_params *params, 690 struct snd_soc_dai *dai) 691 { 692 struct snd_soc_pcm_runtime *rtd = substream->private_data; 693 struct snd_soc_device *socdev = rtd->socdev; 694 struct snd_soc_codec *codec = socdev->card->codec; 695 struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec); 696 /* Word length mask = 0x60 */ 697 u16 iface_ctl = snd_soc_read(codec, WM8978_AUDIO_INTERFACE) & ~0x60; 698 /* Sampling rate mask = 0xe (for filters) */ 699 u16 add_ctl = snd_soc_read(codec, WM8978_ADDITIONAL_CONTROL) & ~0xe; 700 u16 clking = snd_soc_read(codec, WM8978_CLOCKING); 701 enum wm8978_sysclk_src current_clk_id = clking & 0x100 ? 702 WM8978_PLL : WM8978_MCLK; 703 unsigned int f_sel, diff, diff_best = INT_MAX; 704 int i, best = 0; 705 706 if (!wm8978->f_mclk) 707 return -EINVAL; 708 709 /* bit size */ 710 switch (params_format(params)) { 711 case SNDRV_PCM_FORMAT_S16_LE: 712 break; 713 case SNDRV_PCM_FORMAT_S20_3LE: 714 iface_ctl |= 0x20; 715 break; 716 case SNDRV_PCM_FORMAT_S24_LE: 717 iface_ctl |= 0x40; 718 break; 719 case SNDRV_PCM_FORMAT_S32_LE: 720 iface_ctl |= 0x60; 721 break; 722 } 723 724 /* filter coefficient */ 725 switch (params_rate(params)) { 726 case 8000: 727 add_ctl |= 0x5 << 1; 728 break; 729 case 11025: 730 add_ctl |= 0x4 << 1; 731 break; 732 case 16000: 733 add_ctl |= 0x3 << 1; 734 break; 735 case 22050: 736 add_ctl |= 0x2 << 1; 737 break; 738 case 32000: 739 add_ctl |= 0x1 << 1; 740 break; 741 case 44100: 742 case 48000: 743 break; 744 } 745 746 /* Sampling rate is known now, can configure the MCLK divider */ 747 wm8978->f_256fs = params_rate(params) * 256; 748 749 if (wm8978->sysclk == WM8978_MCLK) { 750 wm8978->mclk_idx = -1; 751 f_sel = wm8978->f_mclk; 752 } else { 753 if (!wm8978->f_pllout) { 754 /* We only enter here, if OPCLK is not used */ 755 int ret = wm8978_configure_pll(codec); 756 if (ret < 0) 757 return ret; 758 } 759 f_sel = wm8978->f_pllout; 760 } 761 762 if (wm8978->mclk_idx < 0) { 763 /* Either MCLK is used directly, or OPCLK is used */ 764 if (f_sel < wm8978->f_256fs || f_sel > 12 * wm8978->f_256fs) 765 return -EINVAL; 766 767 for (i = 0; i < ARRAY_SIZE(mclk_numerator); i++) { 768 diff = abs(wm8978->f_256fs * 3 - 769 f_sel * 3 * mclk_denominator[i] / mclk_numerator[i]); 770 771 if (diff < diff_best) { 772 diff_best = diff; 773 best = i; 774 } 775 776 if (!diff) 777 break; 778 } 779 } else { 780 /* OPCLK not used, codec driven by PLL */ 781 best = wm8978->mclk_idx; 782 diff = 0; 783 } 784 785 if (diff) 786 dev_warn(codec->dev, "Imprecise sampling rate: %uHz%s\n", 787 f_sel * mclk_denominator[best] / mclk_numerator[best] / 256, 788 wm8978->sysclk == WM8978_MCLK ? 789 ", consider using PLL" : ""); 790 791 dev_dbg(codec->dev, "%s: fmt %d, rate %u, MCLK divisor #%d\n", __func__, 792 params_format(params), params_rate(params), best); 793 794 /* MCLK divisor mask = 0xe0 */ 795 snd_soc_update_bits(codec, WM8978_CLOCKING, 0xe0, best << 5); 796 797 snd_soc_write(codec, WM8978_AUDIO_INTERFACE, iface_ctl); 798 snd_soc_write(codec, WM8978_ADDITIONAL_CONTROL, add_ctl); 799 800 if (wm8978->sysclk != current_clk_id) { 801 if (wm8978->sysclk == WM8978_PLL) 802 /* Run CODEC from PLL instead of MCLK */ 803 snd_soc_update_bits(codec, WM8978_CLOCKING, 804 0x100, 0x100); 805 else 806 /* Clock CODEC directly from MCLK */ 807 snd_soc_update_bits(codec, WM8978_CLOCKING, 0x100, 0); 808 } 809 810 return 0; 811 } 812 813 static int wm8978_mute(struct snd_soc_dai *dai, int mute) 814 { 815 struct snd_soc_codec *codec = dai->codec; 816 817 dev_dbg(codec->dev, "%s: %d\n", __func__, mute); 818 819 if (mute) 820 snd_soc_update_bits(codec, WM8978_DAC_CONTROL, 0x40, 0x40); 821 else 822 snd_soc_update_bits(codec, WM8978_DAC_CONTROL, 0x40, 0); 823 824 return 0; 825 } 826 827 static int wm8978_set_bias_level(struct snd_soc_codec *codec, 828 enum snd_soc_bias_level level) 829 { 830 u16 power1 = snd_soc_read(codec, WM8978_POWER_MANAGEMENT_1) & ~3; 831 832 switch (level) { 833 case SND_SOC_BIAS_ON: 834 case SND_SOC_BIAS_PREPARE: 835 power1 |= 1; /* VMID 75k */ 836 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1, power1); 837 break; 838 case SND_SOC_BIAS_STANDBY: 839 /* bit 3: enable bias, bit 2: enable I/O tie off buffer */ 840 power1 |= 0xc; 841 842 if (codec->bias_level == SND_SOC_BIAS_OFF) { 843 /* Initial cap charge at VMID 5k */ 844 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1, 845 power1 | 0x3); 846 mdelay(100); 847 } 848 849 power1 |= 0x2; /* VMID 500k */ 850 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1, power1); 851 break; 852 case SND_SOC_BIAS_OFF: 853 /* Preserve PLL - OPCLK may be used by someone */ 854 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, ~0x20, 0); 855 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_2, 0); 856 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_3, 0); 857 break; 858 } 859 860 dev_dbg(codec->dev, "%s: %d, %x\n", __func__, level, power1); 861 862 codec->bias_level = level; 863 return 0; 864 } 865 866 #define WM8978_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \ 867 SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE) 868 869 static struct snd_soc_dai_ops wm8978_dai_ops = { 870 .hw_params = wm8978_hw_params, 871 .digital_mute = wm8978_mute, 872 .set_fmt = wm8978_set_dai_fmt, 873 .set_clkdiv = wm8978_set_dai_clkdiv, 874 .set_sysclk = wm8978_set_dai_sysclk, 875 }; 876 877 /* Also supports 12kHz */ 878 struct snd_soc_dai wm8978_dai = { 879 .name = "WM8978 HiFi", 880 .id = 1, 881 .playback = { 882 .stream_name = "Playback", 883 .channels_min = 1, 884 .channels_max = 2, 885 .rates = SNDRV_PCM_RATE_8000_48000, 886 .formats = WM8978_FORMATS, 887 }, 888 .capture = { 889 .stream_name = "Capture", 890 .channels_min = 1, 891 .channels_max = 2, 892 .rates = SNDRV_PCM_RATE_8000_48000, 893 .formats = WM8978_FORMATS, 894 }, 895 .ops = &wm8978_dai_ops, 896 }; 897 EXPORT_SYMBOL_GPL(wm8978_dai); 898 899 static int wm8978_suspend(struct platform_device *pdev, pm_message_t state) 900 { 901 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 902 struct snd_soc_codec *codec = socdev->card->codec; 903 904 wm8978_set_bias_level(codec, SND_SOC_BIAS_OFF); 905 /* Also switch PLL off */ 906 snd_soc_write(codec, WM8978_POWER_MANAGEMENT_1, 0); 907 908 return 0; 909 } 910 911 static int wm8978_resume(struct platform_device *pdev) 912 { 913 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 914 struct snd_soc_codec *codec = socdev->card->codec; 915 struct wm8978_priv *wm8978 = snd_soc_codec_get_drvdata(codec); 916 int i; 917 u16 *cache = codec->reg_cache; 918 919 /* Sync reg_cache with the hardware */ 920 for (i = 0; i < ARRAY_SIZE(wm8978_reg); i++) { 921 if (i == WM8978_RESET) 922 continue; 923 if (cache[i] != wm8978_reg[i]) 924 snd_soc_write(codec, i, cache[i]); 925 } 926 927 wm8978_set_bias_level(codec, SND_SOC_BIAS_STANDBY); 928 929 if (wm8978->f_pllout) 930 /* Switch PLL on */ 931 snd_soc_update_bits(codec, WM8978_POWER_MANAGEMENT_1, 0x20, 0x20); 932 933 return 0; 934 } 935 936 static int wm8978_probe(struct platform_device *pdev) 937 { 938 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 939 struct snd_soc_codec *codec; 940 int ret = 0; 941 942 if (wm8978_codec == NULL) { 943 dev_err(&pdev->dev, "Codec device not registered\n"); 944 return -ENODEV; 945 } 946 947 socdev->card->codec = wm8978_codec; 948 codec = wm8978_codec; 949 950 /* register pcms */ 951 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); 952 if (ret < 0) { 953 dev_err(codec->dev, "failed to create pcms: %d\n", ret); 954 goto pcm_err; 955 } 956 957 snd_soc_add_controls(codec, wm8978_snd_controls, 958 ARRAY_SIZE(wm8978_snd_controls)); 959 wm8978_add_widgets(codec); 960 961 pcm_err: 962 return ret; 963 } 964 965 /* power down chip */ 966 static int wm8978_remove(struct platform_device *pdev) 967 { 968 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 969 970 snd_soc_free_pcms(socdev); 971 snd_soc_dapm_free(socdev); 972 973 return 0; 974 } 975 976 struct snd_soc_codec_device soc_codec_dev_wm8978 = { 977 .probe = wm8978_probe, 978 .remove = wm8978_remove, 979 .suspend = wm8978_suspend, 980 .resume = wm8978_resume, 981 }; 982 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8978); 983 984 /* 985 * These registers contain an "update" bit - bit 8. This means, for example, 986 * that one can write new DAC digital volume for both channels, but only when 987 * the update bit is set, will also the volume be updated - simultaneously for 988 * both channels. 989 */ 990 static const int update_reg[] = { 991 WM8978_LEFT_DAC_DIGITAL_VOLUME, 992 WM8978_RIGHT_DAC_DIGITAL_VOLUME, 993 WM8978_LEFT_ADC_DIGITAL_VOLUME, 994 WM8978_RIGHT_ADC_DIGITAL_VOLUME, 995 WM8978_LEFT_INP_PGA_CONTROL, 996 WM8978_RIGHT_INP_PGA_CONTROL, 997 WM8978_LOUT1_HP_CONTROL, 998 WM8978_ROUT1_HP_CONTROL, 999 WM8978_LOUT2_SPK_CONTROL, 1000 WM8978_ROUT2_SPK_CONTROL, 1001 }; 1002 1003 static __devinit int wm8978_register(struct wm8978_priv *wm8978) 1004 { 1005 int ret, i; 1006 struct snd_soc_codec *codec = &wm8978->codec; 1007 1008 if (wm8978_codec) { 1009 dev_err(codec->dev, "Another WM8978 is registered\n"); 1010 return -EINVAL; 1011 } 1012 1013 /* 1014 * Set default system clock to PLL, it is more precise, this is also the 1015 * default hardware setting 1016 */ 1017 wm8978->sysclk = WM8978_PLL; 1018 1019 mutex_init(&codec->mutex); 1020 INIT_LIST_HEAD(&codec->dapm_widgets); 1021 INIT_LIST_HEAD(&codec->dapm_paths); 1022 1023 snd_soc_codec_set_drvdata(codec, wm8978); 1024 codec->name = "WM8978"; 1025 codec->owner = THIS_MODULE; 1026 codec->bias_level = SND_SOC_BIAS_OFF; 1027 codec->set_bias_level = wm8978_set_bias_level; 1028 codec->dai = &wm8978_dai; 1029 codec->num_dai = 1; 1030 codec->reg_cache_size = WM8978_CACHEREGNUM; 1031 codec->reg_cache = &wm8978->reg_cache; 1032 1033 ret = snd_soc_codec_set_cache_io(codec, 7, 9, SND_SOC_I2C); 1034 if (ret < 0) { 1035 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret); 1036 goto err; 1037 } 1038 1039 memcpy(codec->reg_cache, wm8978_reg, sizeof(wm8978_reg)); 1040 1041 /* 1042 * Set the update bit in all registers, that have one. This way all 1043 * writes to those registers will also cause the update bit to be 1044 * written. 1045 */ 1046 for (i = 0; i < ARRAY_SIZE(update_reg); i++) 1047 ((u16 *)codec->reg_cache)[update_reg[i]] |= 0x100; 1048 1049 /* Reset the codec */ 1050 ret = snd_soc_write(codec, WM8978_RESET, 0); 1051 if (ret < 0) { 1052 dev_err(codec->dev, "Failed to issue reset\n"); 1053 goto err; 1054 } 1055 1056 wm8978_dai.dev = codec->dev; 1057 1058 wm8978_set_bias_level(codec, SND_SOC_BIAS_STANDBY); 1059 1060 wm8978_codec = codec; 1061 1062 ret = snd_soc_register_codec(codec); 1063 if (ret != 0) { 1064 dev_err(codec->dev, "Failed to register codec: %d\n", ret); 1065 goto err; 1066 } 1067 1068 ret = snd_soc_register_dai(&wm8978_dai); 1069 if (ret != 0) { 1070 dev_err(codec->dev, "Failed to register DAI: %d\n", ret); 1071 goto err_codec; 1072 } 1073 1074 return 0; 1075 1076 err_codec: 1077 snd_soc_unregister_codec(codec); 1078 err: 1079 return ret; 1080 } 1081 1082 static __devexit void wm8978_unregister(struct wm8978_priv *wm8978) 1083 { 1084 wm8978_set_bias_level(&wm8978->codec, SND_SOC_BIAS_OFF); 1085 snd_soc_unregister_dai(&wm8978_dai); 1086 snd_soc_unregister_codec(&wm8978->codec); 1087 wm8978_codec = NULL; 1088 } 1089 1090 static __devinit int wm8978_i2c_probe(struct i2c_client *i2c, 1091 const struct i2c_device_id *id) 1092 { 1093 int ret; 1094 struct wm8978_priv *wm8978; 1095 struct snd_soc_codec *codec; 1096 1097 wm8978 = kzalloc(sizeof(struct wm8978_priv), GFP_KERNEL); 1098 if (wm8978 == NULL) 1099 return -ENOMEM; 1100 1101 codec = &wm8978->codec; 1102 codec->hw_write = (hw_write_t)i2c_master_send; 1103 1104 i2c_set_clientdata(i2c, wm8978); 1105 codec->control_data = i2c; 1106 1107 codec->dev = &i2c->dev; 1108 1109 ret = wm8978_register(wm8978); 1110 if (ret < 0) 1111 kfree(wm8978); 1112 1113 return ret; 1114 } 1115 1116 static __devexit int wm8978_i2c_remove(struct i2c_client *client) 1117 { 1118 struct wm8978_priv *wm8978 = i2c_get_clientdata(client); 1119 wm8978_unregister(wm8978); 1120 kfree(wm8978); 1121 return 0; 1122 } 1123 1124 static const struct i2c_device_id wm8978_i2c_id[] = { 1125 { "wm8978", 0 }, 1126 { } 1127 }; 1128 MODULE_DEVICE_TABLE(i2c, wm8978_i2c_id); 1129 1130 static struct i2c_driver wm8978_i2c_driver = { 1131 .driver = { 1132 .name = "WM8978", 1133 .owner = THIS_MODULE, 1134 }, 1135 .probe = wm8978_i2c_probe, 1136 .remove = __devexit_p(wm8978_i2c_remove), 1137 .id_table = wm8978_i2c_id, 1138 }; 1139 1140 static int __init wm8978_modinit(void) 1141 { 1142 return i2c_add_driver(&wm8978_i2c_driver); 1143 } 1144 module_init(wm8978_modinit); 1145 1146 static void __exit wm8978_exit(void) 1147 { 1148 i2c_del_driver(&wm8978_i2c_driver); 1149 } 1150 module_exit(wm8978_exit); 1151 1152 MODULE_DESCRIPTION("ASoC WM8978 codec driver"); 1153 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>"); 1154 MODULE_LICENSE("GPL"); 1155