sound/hda/hdac_regmap.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Regmap support for HD-audio verbs
   4  *
   5  * A virtual register is translated to one or more hda verbs for write,
   6  * vice versa for read.
   7  *
   8  * A few limitations:
   9  * - Provided for not all verbs but only subset standard non-volatile verbs.
  10  * - For reading, only AC_VERB_GET_* variants can be used.
  11  * - For writing, mapped to the *corresponding* AC_VERB_SET_* variants,
  12  *   so can't handle asymmetric verbs for read and write
  13  */
  14
  15 #include <linux/slab.h>
  16 #include <linux/device.h>
  17 #include <linux/regmap.h>
  18 #include <linux/export.h>
  19 #include <linux/pm.h>
  20 #include <linux/pm_runtime.h>
  21 #include <sound/core.h>
  22 #include <sound/hdaudio.h>
  23 #include <sound/hda_regmap.h>
  24
  25 static int codec_pm_lock(struct hdac_device *codec)
  26 {
  27         return snd_hdac_keep_power_up(codec);
  28 }
  29
  30 static void codec_pm_unlock(struct hdac_device *codec, int lock)
  31 {
  32         if (lock == 1)
  33                 snd_hdac_power_down_pm(codec);
  34 }
  35
  36 #define get_verb(reg)   (((reg) >> 8) & 0xfff)
  37
  38 static bool hda_volatile_reg(struct device *dev, unsigned int reg)
  39 {
  40         struct hdac_device *codec = dev_to_hdac_dev(dev);
  41         unsigned int verb = get_verb(reg);
  42
  43         switch (verb) {
  44         case AC_VERB_GET_PROC_COEF:
  45                 return !codec->cache_coef;
  46         case AC_VERB_GET_COEF_INDEX:
  47         case AC_VERB_GET_PROC_STATE:
  48         case AC_VERB_GET_POWER_STATE:
  49         case AC_VERB_GET_PIN_SENSE:
  50         case AC_VERB_GET_HDMI_DIP_SIZE:
  51         case AC_VERB_GET_HDMI_ELDD:
  52         case AC_VERB_GET_HDMI_DIP_INDEX:
  53         case AC_VERB_GET_HDMI_DIP_DATA:
  54         case AC_VERB_GET_HDMI_DIP_XMIT:
  55         case AC_VERB_GET_HDMI_CP_CTRL:
  56         case AC_VERB_GET_HDMI_CHAN_SLOT:
  57         case AC_VERB_GET_DEVICE_SEL:
  58         case AC_VERB_GET_DEVICE_LIST:   /* read-only volatile */
  59                 return true;
  60         }
  61
  62         return false;
  63 }
  64
  65 static bool hda_writeable_reg(struct device *dev, unsigned int reg)
  66 {
  67         struct hdac_device *codec = dev_to_hdac_dev(dev);
  68         unsigned int verb = get_verb(reg);
  69         const unsigned int *v;
  70         int i;
  71
  72         snd_array_for_each(&codec->vendor_verbs, i, v) {
  73                 if (verb == *v)
  74                         return true;
  75         }
  76
  77         if (codec->caps_overwriting)
  78                 return true;
  79
  80         switch (verb & 0xf00) {
  81         case AC_VERB_GET_STREAM_FORMAT:
  82         case AC_VERB_GET_AMP_GAIN_MUTE:
  83                 return true;
  84         case AC_VERB_GET_PROC_COEF:
  85                 return codec->cache_coef;
  86         case 0xf00:
  87                 break;
  88         default:
  89                 return false;
  90         }
  91
  92         switch (verb) {
  93         case AC_VERB_GET_CONNECT_SEL:
  94         case AC_VERB_GET_SDI_SELECT:
  95         case AC_VERB_GET_PIN_WIDGET_CONTROL:
  96         case AC_VERB_GET_UNSOLICITED_RESPONSE: /* only as SET_UNSOLICITED_ENABLE */
  97         case AC_VERB_GET_BEEP_CONTROL:
  98         case AC_VERB_GET_EAPD_BTLENABLE:
  99         case AC_VERB_GET_DIGI_CONVERT_1:
 100         case AC_VERB_GET_DIGI_CONVERT_2: /* only for beep control */
 101         case AC_VERB_GET_VOLUME_KNOB_CONTROL:
 102         case AC_VERB_GET_GPIO_MASK:
 103         case AC_VERB_GET_GPIO_DIRECTION:
 104         case AC_VERB_GET_GPIO_DATA: /* not for volatile read */
 105         case AC_VERB_GET_GPIO_WAKE_MASK:
 106         case AC_VERB_GET_GPIO_UNSOLICITED_RSP_MASK:
 107         case AC_VERB_GET_GPIO_STICKY_MASK:
 108                 return true;
 109         }
 110
 111         return false;
 112 }
 113
 114 static bool hda_readable_reg(struct device *dev, unsigned int reg)
 115 {
 116         struct hdac_device *codec = dev_to_hdac_dev(dev);
 117         unsigned int verb = get_verb(reg);
 118
 119         if (codec->caps_overwriting)
 120                 return true;
 121
 122         switch (verb) {
 123         case AC_VERB_PARAMETERS:
 124         case AC_VERB_GET_CONNECT_LIST:
 125         case AC_VERB_GET_SUBSYSTEM_ID:
 126                 return true;
 127         /* below are basically writable, but disabled for reducing unnecessary
 128          * writes at sync
 129          */
 130         case AC_VERB_GET_CONFIG_DEFAULT: /* usually just read */
 131         case AC_VERB_GET_CONV: /* managed in PCM code */
 132         case AC_VERB_GET_CVT_CHAN_COUNT: /* managed in HDMI CA code */
 133                 return true;
 134         }
 135
 136         return hda_writeable_reg(dev, reg);
 137 }
 138
 139 /*
 140  * Stereo amp pseudo register:
 141  * for making easier to handle the stereo volume control, we provide a
 142  * fake register to deal both left and right channels by a single
 143  * (pseudo) register access.  A verb consisting of SET_AMP_GAIN with
 144  * *both* SET_LEFT and SET_RIGHT bits takes a 16bit value, the lower 8bit
 145  * for the left and the upper 8bit for the right channel.
 146  */
 147 static bool is_stereo_amp_verb(unsigned int reg)
 148 {
 149         if (((reg >> 8) & 0x700) != AC_VERB_SET_AMP_GAIN_MUTE)
 150                 return false;
 151         return (reg & (AC_AMP_SET_LEFT | AC_AMP_SET_RIGHT)) ==
 152                 (AC_AMP_SET_LEFT | AC_AMP_SET_RIGHT);
 153 }
 154
 155 /* read a pseudo stereo amp register (16bit left+right) */
 156 static int hda_reg_read_stereo_amp(struct hdac_device *codec,
 157                                    unsigned int reg, unsigned int *val)
 158 {
 159         unsigned int left, right;
 160         int err;
 161
 162         reg &= ~(AC_AMP_SET_LEFT | AC_AMP_SET_RIGHT);
 163         err = snd_hdac_exec_verb(codec, reg | AC_AMP_GET_LEFT, 0, &left);
 164         if (err < 0)
 165                 return err;
 166         err = snd_hdac_exec_verb(codec, reg | AC_AMP_GET_RIGHT, 0, &right);
 167         if (err < 0)
 168                 return err;
 169         *val = left | (right << 8);
 170         return 0;
 171 }
 172
 173 /* write a pseudo stereo amp register (16bit left+right) */
 174 static int hda_reg_write_stereo_amp(struct hdac_device *codec,
 175                                     unsigned int reg, unsigned int val)
 176 {
 177         int err;
 178         unsigned int verb, left, right;
 179
 180         verb = AC_VERB_SET_AMP_GAIN_MUTE << 8;
 181         if (reg & AC_AMP_GET_OUTPUT)
 182                 verb |= AC_AMP_SET_OUTPUT;
 183         else
 184                 verb |= AC_AMP_SET_INPUT | ((reg & 0xf) << 8);
 185         reg = (reg & ~0xfffff) | verb;
 186
 187         left = val & 0xff;
 188         right = (val >> 8) & 0xff;
 189         if (left == right) {
 190                 reg |= AC_AMP_SET_LEFT | AC_AMP_SET_RIGHT;
 191                 return snd_hdac_exec_verb(codec, reg | left, 0, NULL);
 192         }
 193
 194         err = snd_hdac_exec_verb(codec, reg | AC_AMP_SET_LEFT | left, 0, NULL);
 195         if (err < 0)
 196                 return err;
 197         err = snd_hdac_exec_verb(codec, reg | AC_AMP_SET_RIGHT | right, 0, NULL);
 198         if (err < 0)
 199                 return err;
 200         return 0;
 201 }
 202
 203 /* read a pseudo coef register (16bit) */
 204 static int hda_reg_read_coef(struct hdac_device *codec, unsigned int reg,
 205                              unsigned int *val)
 206 {
 207         unsigned int verb;
 208         int err;
 209
 210         if (!codec->cache_coef)
 211                 return -EINVAL;
 212         /* LSB 8bit = coef index */
 213         verb = (reg & ~0xfff00) | (AC_VERB_SET_COEF_INDEX << 8);
 214         err = snd_hdac_exec_verb(codec, verb, 0, NULL);
 215         if (err < 0)
 216                 return err;
 217         verb = (reg & ~0xfffff) | (AC_VERB_GET_COEF_INDEX << 8);
 218         return snd_hdac_exec_verb(codec, verb, 0, val);
 219 }
 220
 221 /* write a pseudo coef register (16bit) */
 222 static int hda_reg_write_coef(struct hdac_device *codec, unsigned int reg,
 223                               unsigned int val)
 224 {
 225         unsigned int verb;
 226         int err;
 227
 228         if (!codec->cache_coef)
 229                 return -EINVAL;
 230         /* LSB 8bit = coef index */
 231         verb = (reg & ~0xfff00) | (AC_VERB_SET_COEF_INDEX << 8);
 232         err = snd_hdac_exec_verb(codec, verb, 0, NULL);
 233         if (err < 0)
 234                 return err;
 235         verb = (reg & ~0xfffff) | (AC_VERB_GET_COEF_INDEX << 8) |
 236                 (val & 0xffff);
 237         return snd_hdac_exec_verb(codec, verb, 0, NULL);
 238 }
 239
 240 static int hda_reg_read(void *context, unsigned int reg, unsigned int *val)
 241 {
 242         struct hdac_device *codec = context;
 243         int verb = get_verb(reg);
 244         int err;
 245         int pm_lock = 0;
 246
 247         if (verb != AC_VERB_GET_POWER_STATE) {
 248                 pm_lock = codec_pm_lock(codec);
 249                 if (pm_lock < 0)
 250                         return -EAGAIN;
 251         }
 252         reg |= (codec->addr << 28);
 253         if (is_stereo_amp_verb(reg)) {
 254                 err = hda_reg_read_stereo_amp(codec, reg, val);
 255                 goto out;
 256         }
 257         if (verb == AC_VERB_GET_PROC_COEF) {
 258                 err = hda_reg_read_coef(codec, reg, val);
 259                 goto out;
 260         }
 261         if ((verb & 0x700) == AC_VERB_SET_AMP_GAIN_MUTE)
 262                 reg &= ~AC_AMP_FAKE_MUTE;
 263
 264         err = snd_hdac_exec_verb(codec, reg, 0, val);
 265         if (err < 0)
 266                 goto out;
 267         /* special handling for asymmetric reads */
 268         if (verb == AC_VERB_GET_POWER_STATE) {
 269                 if (*val & AC_PWRST_ERROR)
 270                         *val = -1;
 271                 else /* take only the actual state */
 272                         *val = (*val >> 4) & 0x0f;
 273         }
 274  out:
 275         codec_pm_unlock(codec, pm_lock);
 276         return err;
 277 }
 278
 279 static int hda_reg_write(void *context, unsigned int reg, unsigned int val)
 280 {
 281         struct hdac_device *codec = context;
 282         unsigned int verb;
 283         int i, bytes, err;
 284         int pm_lock = 0;
 285
 286         if (codec->caps_overwriting)
 287                 return 0;
 288
 289         reg &= ~0x00080000U; /* drop GET bit */
 290         reg |= (codec->addr << 28);
 291         verb = get_verb(reg);
 292
 293         if (verb != AC_VERB_SET_POWER_STATE) {
 294                 pm_lock = codec_pm_lock(codec);
 295                 if (pm_lock < 0)
 296                         return codec->lazy_cache ? 0 : -EAGAIN;
 297         }
 298
 299         if (is_stereo_amp_verb(reg)) {
 300                 err = hda_reg_write_stereo_amp(codec, reg, val);
 301                 goto out;
 302         }
 303
 304         if (verb == AC_VERB_SET_PROC_COEF) {
 305                 err = hda_reg_write_coef(codec, reg, val);
 306                 goto out;
 307         }
 308
 309         switch (verb & 0xf00) {
 310         case AC_VERB_SET_AMP_GAIN_MUTE:
 311                 if ((reg & AC_AMP_FAKE_MUTE) && (val & AC_AMP_MUTE))
 312                         val = 0;
 313                 verb = AC_VERB_SET_AMP_GAIN_MUTE;
 314                 if (reg & AC_AMP_GET_LEFT)
 315                         verb |= AC_AMP_SET_LEFT >> 8;
 316                 else
 317                         verb |= AC_AMP_SET_RIGHT >> 8;
 318                 if (reg & AC_AMP_GET_OUTPUT) {
 319                         verb |= AC_AMP_SET_OUTPUT >> 8;
 320                 } else {
 321                         verb |= AC_AMP_SET_INPUT >> 8;
 322                         verb |= reg & 0xf;
 323                 }
 324                 break;
 325         }
 326
 327         switch (verb) {
 328         case AC_VERB_SET_DIGI_CONVERT_1:
 329                 bytes = 2;
 330                 break;
 331         case AC_VERB_SET_CONFIG_DEFAULT_BYTES_0:
 332                 bytes = 4;
 333                 break;
 334         default:
 335                 bytes = 1;
 336                 break;
 337         }
 338
 339         for (i = 0; i < bytes; i++) {
 340                 reg &= ~0xfffff;
 341                 reg |= (verb + i) << 8 | ((val >> (8 * i)) & 0xff);
 342                 err = snd_hdac_exec_verb(codec, reg, 0, NULL);
 343                 if (err < 0)
 344                         goto out;
 345         }
 346
 347  out:
 348         codec_pm_unlock(codec, pm_lock);
 349         return err;
 350 }
 351
 352 static const struct regmap_config hda_regmap_cfg = {
 353         .name = "hdaudio",
 354         .reg_bits = 32,
 355         .val_bits = 32,
 356         .max_register = 0xfffffff,
 357         .writeable_reg = hda_writeable_reg,
 358         .readable_reg = hda_readable_reg,
 359         .volatile_reg = hda_volatile_reg,
 360         .cache_type = REGCACHE_RBTREE,
 361         .reg_read = hda_reg_read,
 362         .reg_write = hda_reg_write,
 363         .use_single_read = true,
 364         .use_single_write = true,
 365 };
 366
 367 /**
 368  * snd_hdac_regmap_init - Initialize regmap for HDA register accesses
 369  * @codec: the codec object
 370  *
 371  * Returns zero for success or a negative error code.
 372  */
 373 int snd_hdac_regmap_init(struct hdac_device *codec)
 374 {
 375         struct regmap *regmap;
 376
 377         regmap = regmap_init(&codec->dev, NULL, codec, &hda_regmap_cfg);
 378         if (IS_ERR(regmap))
 379                 return PTR_ERR(regmap);
 380         codec->regmap = regmap;
 381         snd_array_init(&codec->vendor_verbs, sizeof(unsigned int), 8);
 382         return 0;
 383 }
 384 EXPORT_SYMBOL_GPL(snd_hdac_regmap_init);
 385
 386 /**
 387  * snd_hdac_regmap_init - Release the regmap from HDA codec
 388  * @codec: the codec object
 389  */
 390 void snd_hdac_regmap_exit(struct hdac_device *codec)
 391 {
 392         if (codec->regmap) {
 393                 regmap_exit(codec->regmap);
 394                 codec->regmap = NULL;
 395                 snd_array_free(&codec->vendor_verbs);
 396         }
 397 }
 398 EXPORT_SYMBOL_GPL(snd_hdac_regmap_exit);
 399
 400 /**
 401  * snd_hdac_regmap_add_vendor_verb - add a vendor-specific verb to regmap
 402  * @codec: the codec object
 403  * @verb: verb to allow accessing via regmap
 404  *
 405  * Returns zero for success or a negative error code.
 406  */
 407 int snd_hdac_regmap_add_vendor_verb(struct hdac_device *codec,
 408                                     unsigned int verb)
 409 {
 410         unsigned int *p = snd_array_new(&codec->vendor_verbs);
 411
 412         if (!p)
 413                 return -ENOMEM;
 414         *p = verb | 0x800; /* set GET bit */
 415         return 0;
 416 }
 417 EXPORT_SYMBOL_GPL(snd_hdac_regmap_add_vendor_verb);
 418
 419 /*
 420  * helper functions
 421  */
 422
 423 /* write a pseudo-register value (w/o power sequence) */
 424 static int reg_raw_write(struct hdac_device *codec, unsigned int reg,
 425                          unsigned int val)
 426 {
 427         if (!codec->regmap)
 428                 return hda_reg_write(codec, reg, val);
 429         else
 430                 return regmap_write(codec->regmap, reg, val);
 431 }
 432
 433 /**
 434  * snd_hdac_regmap_write_raw - write a pseudo register with power mgmt
 435  * @codec: the codec object
 436  * @reg: pseudo register
 437  * @val: value to write
 438  *
 439  * Returns zero if successful or a negative error code.
 440  */
 441 int snd_hdac_regmap_write_raw(struct hdac_device *codec, unsigned int reg,
 442                               unsigned int val)
 443 {
 444         int err;
 445
 446         err = reg_raw_write(codec, reg, val);
 447         if (err == -EAGAIN) {
 448                 err = snd_hdac_power_up_pm(codec);
 449                 if (err >= 0)
 450                         err = reg_raw_write(codec, reg, val);
 451                 snd_hdac_power_down_pm(codec);
 452         }
 453         return err;
 454 }
 455 EXPORT_SYMBOL_GPL(snd_hdac_regmap_write_raw);
 456
 457 static int reg_raw_read(struct hdac_device *codec, unsigned int reg,
 458                         unsigned int *val, bool uncached)
 459 {
 460         if (uncached || !codec->regmap)
 461                 return hda_reg_read(codec, reg, val);
 462         else
 463                 return regmap_read(codec->regmap, reg, val);
 464 }
 465
 466 static int __snd_hdac_regmap_read_raw(struct hdac_device *codec,
 467                                       unsigned int reg, unsigned int *val,
 468                                       bool uncached)
 469 {
 470         int err;
 471
 472         err = reg_raw_read(codec, reg, val, uncached);
 473         if (err == -EAGAIN) {
 474                 err = snd_hdac_power_up_pm(codec);
 475                 if (err >= 0)
 476                         err = reg_raw_read(codec, reg, val, uncached);
 477                 snd_hdac_power_down_pm(codec);
 478         }
 479         return err;
 480 }
 481
 482 /**
 483  * snd_hdac_regmap_read_raw - read a pseudo register with power mgmt
 484  * @codec: the codec object
 485  * @reg: pseudo register
 486  * @val: pointer to store the read value
 487  *
 488  * Returns zero if successful or a negative error code.
 489  */
 490 int snd_hdac_regmap_read_raw(struct hdac_device *codec, unsigned int reg,
 491                              unsigned int *val)
 492 {
 493         return __snd_hdac_regmap_read_raw(codec, reg, val, false);
 494 }
 495 EXPORT_SYMBOL_GPL(snd_hdac_regmap_read_raw);
 496
 497 /* Works like snd_hdac_regmap_read_raw(), but this doesn't read from the
 498  * cache but always via hda verbs.
 499  */
 500 int snd_hdac_regmap_read_raw_uncached(struct hdac_device *codec,
 501                                       unsigned int reg, unsigned int *val)
 502 {
 503         return __snd_hdac_regmap_read_raw(codec, reg, val, true);
 504 }
 505
 506 /**
 507  * snd_hdac_regmap_update_raw - update a pseudo register with power mgmt
 508  * @codec: the codec object
 509  * @reg: pseudo register
 510  * @mask: bit mask to udpate
 511  * @val: value to update
 512  *
 513  * Returns zero if successful or a negative error code.
 514  */
 515 int snd_hdac_regmap_update_raw(struct hdac_device *codec, unsigned int reg,
 516                                unsigned int mask, unsigned int val)
 517 {
 518         unsigned int orig;
 519         int err;
 520
 521         val &= mask;
 522         err = snd_hdac_regmap_read_raw(codec, reg, &orig);
 523         if (err < 0)
 524                 return err;
 525         val |= orig & ~mask;
 526         if (val == orig)
 527                 return 0;
 528         err = snd_hdac_regmap_write_raw(codec, reg, val);
 529         if (err < 0)
 530                 return err;
 531         return 1;
 532 }
 533 EXPORT_SYMBOL_GPL(snd_hdac_regmap_update_raw);