sound/hda/hdac_regmap.c

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