drivers/iio/common/st_sensors/st_sensors_core.c

   1 /*
   2  * STMicroelectronics sensors core library driver
   3  *
   4  * Copyright 2012-2013 STMicroelectronics Inc.
   5  *
   6  * Denis Ciocca <denis.ciocca@st.com>
   7  *
   8  * Licensed under the GPL-2.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/slab.h>
  14 #include <linux/delay.h>
  15 #include <linux/iio/iio.h>
  16 #include <linux/regulator/consumer.h>
  17 #include <linux/of.h>
  18 #include <asm/unaligned.h>
  19 #include <linux/iio/common/st_sensors.h>
  20
  21 #include "st_sensors_core.h"
  22
  23 static inline u32 st_sensors_get_unaligned_le24(const u8 *p)
  24 {
  25         return (s32)((p[0] | p[1] << 8 | p[2] << 16) << 8) >> 8;
  26 }
  27
  28 int st_sensors_write_data_with_mask(struct iio_dev *indio_dev,
  29                                     u8 reg_addr, u8 mask, u8 data)
  30 {
  31         int err;
  32         u8 new_data;
  33         struct st_sensor_data *sdata = iio_priv(indio_dev);
  34
  35         err = sdata->tf->read_byte(&sdata->tb, sdata->dev, reg_addr, &new_data);
  36         if (err < 0)
  37                 goto st_sensors_write_data_with_mask_error;
  38
  39         new_data = ((new_data & (~mask)) | ((data << __ffs(mask)) & mask));
  40         err = sdata->tf->write_byte(&sdata->tb, sdata->dev, reg_addr, new_data);
  41
  42 st_sensors_write_data_with_mask_error:
  43         return err;
  44 }
  45
  46 int st_sensors_debugfs_reg_access(struct iio_dev *indio_dev,
  47                                   unsigned reg, unsigned writeval,
  48                                   unsigned *readval)
  49 {
  50         struct st_sensor_data *sdata = iio_priv(indio_dev);
  51         u8 readdata;
  52         int err;
  53
  54         if (!readval)
  55                 return sdata->tf->write_byte(&sdata->tb, sdata->dev,
  56                                              (u8)reg, (u8)writeval);
  57
  58         err = sdata->tf->read_byte(&sdata->tb, sdata->dev, (u8)reg, &readdata);
  59         if (err < 0)
  60                 return err;
  61
  62         *readval = (unsigned)readdata;
  63
  64         return 0;
  65 }
  66 EXPORT_SYMBOL(st_sensors_debugfs_reg_access);
  67
  68 static int st_sensors_match_odr(struct st_sensor_settings *sensor_settings,
  69                         unsigned int odr, struct st_sensor_odr_avl *odr_out)
  70 {
  71         int i, ret = -EINVAL;
  72
  73         for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) {
  74                 if (sensor_settings->odr.odr_avl[i].hz == 0)
  75                         goto st_sensors_match_odr_error;
  76
  77                 if (sensor_settings->odr.odr_avl[i].hz == odr) {
  78                         odr_out->hz = sensor_settings->odr.odr_avl[i].hz;
  79                         odr_out->value = sensor_settings->odr.odr_avl[i].value;
  80                         ret = 0;
  81                         break;
  82                 }
  83         }
  84
  85 st_sensors_match_odr_error:
  86         return ret;
  87 }
  88
  89 int st_sensors_set_odr(struct iio_dev *indio_dev, unsigned int odr)
  90 {
  91         int err;
  92         struct st_sensor_odr_avl odr_out = {0, 0};
  93         struct st_sensor_data *sdata = iio_priv(indio_dev);
  94
  95         err = st_sensors_match_odr(sdata->sensor_settings, odr, &odr_out);
  96         if (err < 0)
  97                 goto st_sensors_match_odr_error;
  98
  99         if ((sdata->sensor_settings->odr.addr ==
 100                                         sdata->sensor_settings->pw.addr) &&
 101                                 (sdata->sensor_settings->odr.mask ==
 102                                         sdata->sensor_settings->pw.mask)) {
 103                 if (sdata->enabled == true) {
 104                         err = st_sensors_write_data_with_mask(indio_dev,
 105                                 sdata->sensor_settings->odr.addr,
 106                                 sdata->sensor_settings->odr.mask,
 107                                 odr_out.value);
 108                 } else {
 109                         err = 0;
 110                 }
 111         } else {
 112                 err = st_sensors_write_data_with_mask(indio_dev,
 113                         sdata->sensor_settings->odr.addr,
 114                         sdata->sensor_settings->odr.mask,
 115                         odr_out.value);
 116         }
 117         if (err >= 0)
 118                 sdata->odr = odr_out.hz;
 119
 120 st_sensors_match_odr_error:
 121         return err;
 122 }
 123 EXPORT_SYMBOL(st_sensors_set_odr);
 124
 125 static int st_sensors_match_fs(struct st_sensor_settings *sensor_settings,
 126                                         unsigned int fs, int *index_fs_avl)
 127 {
 128         int i, ret = -EINVAL;
 129
 130         for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
 131                 if (sensor_settings->fs.fs_avl[i].num == 0)
 132                         goto st_sensors_match_odr_error;
 133
 134                 if (sensor_settings->fs.fs_avl[i].num == fs) {
 135                         *index_fs_avl = i;
 136                         ret = 0;
 137                         break;
 138                 }
 139         }
 140
 141 st_sensors_match_odr_error:
 142         return ret;
 143 }
 144
 145 static int st_sensors_set_fullscale(struct iio_dev *indio_dev, unsigned int fs)
 146 {
 147         int err, i = 0;
 148         struct st_sensor_data *sdata = iio_priv(indio_dev);
 149
 150         if (sdata->sensor_settings->fs.addr == 0)
 151                 return 0;
 152
 153         err = st_sensors_match_fs(sdata->sensor_settings, fs, &i);
 154         if (err < 0)
 155                 goto st_accel_set_fullscale_error;
 156
 157         err = st_sensors_write_data_with_mask(indio_dev,
 158                                 sdata->sensor_settings->fs.addr,
 159                                 sdata->sensor_settings->fs.mask,
 160                                 sdata->sensor_settings->fs.fs_avl[i].value);
 161         if (err < 0)
 162                 goto st_accel_set_fullscale_error;
 163
 164         sdata->current_fullscale = (struct st_sensor_fullscale_avl *)
 165                                         &sdata->sensor_settings->fs.fs_avl[i];
 166         return err;
 167
 168 st_accel_set_fullscale_error:
 169         dev_err(&indio_dev->dev, "failed to set new fullscale.\n");
 170         return err;
 171 }
 172
 173 int st_sensors_set_enable(struct iio_dev *indio_dev, bool enable)
 174 {
 175         u8 tmp_value;
 176         int err = -EINVAL;
 177         bool found = false;
 178         struct st_sensor_odr_avl odr_out = {0, 0};
 179         struct st_sensor_data *sdata = iio_priv(indio_dev);
 180
 181         if (enable) {
 182                 tmp_value = sdata->sensor_settings->pw.value_on;
 183                 if ((sdata->sensor_settings->odr.addr ==
 184                                         sdata->sensor_settings->pw.addr) &&
 185                                 (sdata->sensor_settings->odr.mask ==
 186                                         sdata->sensor_settings->pw.mask)) {
 187                         err = st_sensors_match_odr(sdata->sensor_settings,
 188                                                         sdata->odr, &odr_out);
 189                         if (err < 0)
 190                                 goto set_enable_error;
 191                         tmp_value = odr_out.value;
 192                         found = true;
 193                 }
 194                 err = st_sensors_write_data_with_mask(indio_dev,
 195                                 sdata->sensor_settings->pw.addr,
 196                                 sdata->sensor_settings->pw.mask, tmp_value);
 197                 if (err < 0)
 198                         goto set_enable_error;
 199
 200                 sdata->enabled = true;
 201
 202                 if (found)
 203                         sdata->odr = odr_out.hz;
 204         } else {
 205                 err = st_sensors_write_data_with_mask(indio_dev,
 206                                 sdata->sensor_settings->pw.addr,
 207                                 sdata->sensor_settings->pw.mask,
 208                                 sdata->sensor_settings->pw.value_off);
 209                 if (err < 0)
 210                         goto set_enable_error;
 211
 212                 sdata->enabled = false;
 213         }
 214
 215 set_enable_error:
 216         return err;
 217 }
 218 EXPORT_SYMBOL(st_sensors_set_enable);
 219
 220 int st_sensors_set_axis_enable(struct iio_dev *indio_dev, u8 axis_enable)
 221 {
 222         struct st_sensor_data *sdata = iio_priv(indio_dev);
 223
 224         return st_sensors_write_data_with_mask(indio_dev,
 225                                 sdata->sensor_settings->enable_axis.addr,
 226                                 sdata->sensor_settings->enable_axis.mask,
 227                                 axis_enable);
 228 }
 229 EXPORT_SYMBOL(st_sensors_set_axis_enable);
 230
 231 int st_sensors_power_enable(struct iio_dev *indio_dev)
 232 {
 233         struct st_sensor_data *pdata = iio_priv(indio_dev);
 234         int err;
 235
 236         /* Regulators not mandatory, but if requested we should enable them. */
 237         pdata->vdd = devm_regulator_get_optional(indio_dev->dev.parent, "vdd");
 238         if (!IS_ERR(pdata->vdd)) {
 239                 err = regulator_enable(pdata->vdd);
 240                 if (err != 0) {
 241                         dev_warn(&indio_dev->dev,
 242                                  "Failed to enable specified Vdd supply\n");
 243                         return err;
 244                 }
 245         } else {
 246                 err = PTR_ERR(pdata->vdd);
 247                 if (err != -ENODEV)
 248                         return err;
 249         }
 250
 251         pdata->vdd_io = devm_regulator_get_optional(indio_dev->dev.parent, "vddio");
 252         if (!IS_ERR(pdata->vdd_io)) {
 253                 err = regulator_enable(pdata->vdd_io);
 254                 if (err != 0) {
 255                         dev_warn(&indio_dev->dev,
 256                                  "Failed to enable specified Vdd_IO supply\n");
 257                         goto st_sensors_disable_vdd;
 258                 }
 259         } else {
 260                 err = PTR_ERR(pdata->vdd_io);
 261                 if (err != -ENODEV)
 262                         goto st_sensors_disable_vdd;
 263         }
 264
 265         return 0;
 266
 267 st_sensors_disable_vdd:
 268         if (!IS_ERR_OR_NULL(pdata->vdd))
 269                 regulator_disable(pdata->vdd);
 270         return err;
 271 }
 272 EXPORT_SYMBOL(st_sensors_power_enable);
 273
 274 void st_sensors_power_disable(struct iio_dev *indio_dev)
 275 {
 276         struct st_sensor_data *pdata = iio_priv(indio_dev);
 277
 278         if (!IS_ERR_OR_NULL(pdata->vdd))
 279                 regulator_disable(pdata->vdd);
 280
 281         if (!IS_ERR_OR_NULL(pdata->vdd_io))
 282                 regulator_disable(pdata->vdd_io);
 283 }
 284 EXPORT_SYMBOL(st_sensors_power_disable);
 285
 286 static int st_sensors_set_drdy_int_pin(struct iio_dev *indio_dev,
 287                                         struct st_sensors_platform_data *pdata)
 288 {
 289         struct st_sensor_data *sdata = iio_priv(indio_dev);
 290
 291         /* Sensor does not support interrupts */
 292         if (sdata->sensor_settings->drdy_irq.addr == 0) {
 293                 if (pdata->drdy_int_pin)
 294                         dev_info(&indio_dev->dev,
 295                                  "DRDY on pin INT%d specified, but sensor "
 296                                  "does not support interrupts\n",
 297                                  pdata->drdy_int_pin);
 298                 return 0;
 299         }
 300
 301         switch (pdata->drdy_int_pin) {
 302         case 1:
 303                 if (sdata->sensor_settings->drdy_irq.mask_int1 == 0) {
 304                         dev_err(&indio_dev->dev,
 305                                         "DRDY on INT1 not available.\n");
 306                         return -EINVAL;
 307                 }
 308                 sdata->drdy_int_pin = 1;
 309                 break;
 310         case 2:
 311                 if (sdata->sensor_settings->drdy_irq.mask_int2 == 0) {
 312                         dev_err(&indio_dev->dev,
 313                                         "DRDY on INT2 not available.\n");
 314                         return -EINVAL;
 315                 }
 316                 sdata->drdy_int_pin = 2;
 317                 break;
 318         default:
 319                 dev_err(&indio_dev->dev, "DRDY on pdata not valid.\n");
 320                 return -EINVAL;
 321         }
 322
 323         if (pdata->open_drain) {
 324                 if (!sdata->sensor_settings->drdy_irq.addr_od)
 325                         dev_err(&indio_dev->dev,
 326                                 "open drain requested but unsupported.\n");
 327                 else
 328                         sdata->int_pin_open_drain = true;
 329         }
 330
 331         return 0;
 332 }
 333
 334 #ifdef CONFIG_OF
 335 static struct st_sensors_platform_data *st_sensors_of_probe(struct device *dev,
 336                 struct st_sensors_platform_data *defdata)
 337 {
 338         struct st_sensors_platform_data *pdata;
 339         struct device_node *np = dev->of_node;
 340         u32 val;
 341
 342         if (!np)
 343                 return NULL;
 344
 345         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 346         if (!of_property_read_u32(np, "st,drdy-int-pin", &val) && (val <= 2))
 347                 pdata->drdy_int_pin = (u8) val;
 348         else
 349                 pdata->drdy_int_pin = defdata ? defdata->drdy_int_pin : 0;
 350
 351         pdata->open_drain = of_property_read_bool(np, "drive-open-drain");
 352
 353         return pdata;
 354 }
 355 #else
 356 static struct st_sensors_platform_data *st_sensors_of_probe(struct device *dev,
 357                 struct st_sensors_platform_data *defdata)
 358 {
 359         return NULL;
 360 }
 361 #endif
 362
 363 int st_sensors_init_sensor(struct iio_dev *indio_dev,
 364                                         struct st_sensors_platform_data *pdata)
 365 {
 366         struct st_sensor_data *sdata = iio_priv(indio_dev);
 367         struct st_sensors_platform_data *of_pdata;
 368         int err = 0;
 369
 370         /* If OF/DT pdata exists, it will take precedence of anything else */
 371         of_pdata = st_sensors_of_probe(indio_dev->dev.parent, pdata);
 372         if (of_pdata)
 373                 pdata = of_pdata;
 374
 375         if (pdata) {
 376                 err = st_sensors_set_drdy_int_pin(indio_dev, pdata);
 377                 if (err < 0)
 378                         return err;
 379         }
 380
 381         err = st_sensors_set_enable(indio_dev, false);
 382         if (err < 0)
 383                 return err;
 384
 385         /* Disable DRDY, this might be still be enabled after reboot. */
 386         err = st_sensors_set_dataready_irq(indio_dev, false);
 387         if (err < 0)
 388                 return err;
 389
 390         if (sdata->current_fullscale) {
 391                 err = st_sensors_set_fullscale(indio_dev,
 392                                                 sdata->current_fullscale->num);
 393                 if (err < 0)
 394                         return err;
 395         } else
 396                 dev_info(&indio_dev->dev, "Full-scale not possible\n");
 397
 398         err = st_sensors_set_odr(indio_dev, sdata->odr);
 399         if (err < 0)
 400                 return err;
 401
 402         /* set BDU */
 403         if (sdata->sensor_settings->bdu.addr) {
 404                 err = st_sensors_write_data_with_mask(indio_dev,
 405                                         sdata->sensor_settings->bdu.addr,
 406                                         sdata->sensor_settings->bdu.mask, true);
 407                 if (err < 0)
 408                         return err;
 409         }
 410
 411         if (sdata->int_pin_open_drain) {
 412                 dev_info(&indio_dev->dev,
 413                          "set interrupt line to open drain mode\n");
 414                 err = st_sensors_write_data_with_mask(indio_dev,
 415                                 sdata->sensor_settings->drdy_irq.addr_od,
 416                                 sdata->sensor_settings->drdy_irq.mask_od, 1);
 417                 if (err < 0)
 418                         return err;
 419         }
 420
 421         err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
 422
 423         return err;
 424 }
 425 EXPORT_SYMBOL(st_sensors_init_sensor);
 426
 427 int st_sensors_set_dataready_irq(struct iio_dev *indio_dev, bool enable)
 428 {
 429         int err;
 430         u8 drdy_mask;
 431         struct st_sensor_data *sdata = iio_priv(indio_dev);
 432
 433         if (!sdata->sensor_settings->drdy_irq.addr)
 434                 return 0;
 435
 436         /* Enable/Disable the interrupt generator 1. */
 437         if (sdata->sensor_settings->drdy_irq.ig1.en_addr > 0) {
 438                 err = st_sensors_write_data_with_mask(indio_dev,
 439                                 sdata->sensor_settings->drdy_irq.ig1.en_addr,
 440                                 sdata->sensor_settings->drdy_irq.ig1.en_mask,
 441                                 (int)enable);
 442                 if (err < 0)
 443                         goto st_accel_set_dataready_irq_error;
 444         }
 445
 446         if (sdata->drdy_int_pin == 1)
 447                 drdy_mask = sdata->sensor_settings->drdy_irq.mask_int1;
 448         else
 449                 drdy_mask = sdata->sensor_settings->drdy_irq.mask_int2;
 450
 451         /* Flag to the poll function that the hardware trigger is in use */
 452         sdata->hw_irq_trigger = enable;
 453
 454         /* Enable/Disable the interrupt generator for data ready. */
 455         err = st_sensors_write_data_with_mask(indio_dev,
 456                                         sdata->sensor_settings->drdy_irq.addr,
 457                                         drdy_mask, (int)enable);
 458
 459 st_accel_set_dataready_irq_error:
 460         return err;
 461 }
 462 EXPORT_SYMBOL(st_sensors_set_dataready_irq);
 463
 464 int st_sensors_set_fullscale_by_gain(struct iio_dev *indio_dev, int scale)
 465 {
 466         int err = -EINVAL, i;
 467         struct st_sensor_data *sdata = iio_priv(indio_dev);
 468
 469         for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
 470                 if ((sdata->sensor_settings->fs.fs_avl[i].gain == scale) &&
 471                                 (sdata->sensor_settings->fs.fs_avl[i].gain != 0)) {
 472                         err = 0;
 473                         break;
 474                 }
 475         }
 476         if (err < 0)
 477                 goto st_sensors_match_scale_error;
 478
 479         err = st_sensors_set_fullscale(indio_dev,
 480                                 sdata->sensor_settings->fs.fs_avl[i].num);
 481
 482 st_sensors_match_scale_error:
 483         return err;
 484 }
 485 EXPORT_SYMBOL(st_sensors_set_fullscale_by_gain);
 486
 487 static int st_sensors_read_axis_data(struct iio_dev *indio_dev,
 488                                 struct iio_chan_spec const *ch, int *data)
 489 {
 490         int err;
 491         u8 *outdata;
 492         struct st_sensor_data *sdata = iio_priv(indio_dev);
 493         unsigned int byte_for_channel = ch->scan_type.realbits >> 3;
 494
 495         outdata = kmalloc(byte_for_channel, GFP_KERNEL);
 496         if (!outdata)
 497                 return -ENOMEM;
 498
 499         err = sdata->tf->read_multiple_byte(&sdata->tb, sdata->dev,
 500                                 ch->address, byte_for_channel,
 501                                 outdata, sdata->multiread_bit);
 502         if (err < 0)
 503                 goto st_sensors_free_memory;
 504
 505         if (byte_for_channel == 1)
 506                 *data = (s8)*outdata;
 507         else if (byte_for_channel == 2)
 508                 *data = (s16)get_unaligned_le16(outdata);
 509         else if (byte_for_channel == 3)
 510                 *data = (s32)st_sensors_get_unaligned_le24(outdata);
 511
 512 st_sensors_free_memory:
 513         kfree(outdata);
 514
 515         return err;
 516 }
 517
 518 int st_sensors_read_info_raw(struct iio_dev *indio_dev,
 519                                 struct iio_chan_spec const *ch, int *val)
 520 {
 521         int err;
 522         struct st_sensor_data *sdata = iio_priv(indio_dev);
 523
 524         mutex_lock(&indio_dev->mlock);
 525         if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) {
 526                 err = -EBUSY;
 527                 goto out;
 528         } else {
 529                 err = st_sensors_set_enable(indio_dev, true);
 530                 if (err < 0)
 531                         goto out;
 532
 533                 msleep((sdata->sensor_settings->bootime * 1000) / sdata->odr);
 534                 err = st_sensors_read_axis_data(indio_dev, ch, val);
 535                 if (err < 0)
 536                         goto out;
 537
 538                 *val = *val >> ch->scan_type.shift;
 539
 540                 err = st_sensors_set_enable(indio_dev, false);
 541         }
 542 out:
 543         mutex_unlock(&indio_dev->mlock);
 544
 545         return err;
 546 }
 547 EXPORT_SYMBOL(st_sensors_read_info_raw);
 548
 549 int st_sensors_check_device_support(struct iio_dev *indio_dev,
 550                         int num_sensors_list,
 551                         const struct st_sensor_settings *sensor_settings)
 552 {
 553         int i, n, err = 0;
 554         u8 wai;
 555         struct st_sensor_data *sdata = iio_priv(indio_dev);
 556
 557         for (i = 0; i < num_sensors_list; i++) {
 558                 for (n = 0; n < ST_SENSORS_MAX_4WAI; n++) {
 559                         if (strcmp(indio_dev->name,
 560                                 sensor_settings[i].sensors_supported[n]) == 0) {
 561                                 break;
 562                         }
 563                 }
 564                 if (n < ST_SENSORS_MAX_4WAI)
 565                         break;
 566         }
 567         if (i == num_sensors_list) {
 568                 dev_err(&indio_dev->dev, "device name %s not recognized.\n",
 569                                                         indio_dev->name);
 570                 return -ENODEV;
 571         }
 572
 573         if (sensor_settings[i].wai_addr) {
 574                 err = sdata->tf->read_byte(&sdata->tb, sdata->dev,
 575                                            sensor_settings[i].wai_addr, &wai);
 576                 if (err < 0) {
 577                         dev_err(&indio_dev->dev,
 578                                 "failed to read Who-Am-I register.\n");
 579                         return err;
 580                 }
 581
 582                 if (sensor_settings[i].wai != wai) {
 583                         dev_err(&indio_dev->dev,
 584                                 "%s: WhoAmI mismatch (0x%x).\n",
 585                                 indio_dev->name, wai);
 586                         return -EINVAL;
 587                 }
 588         }
 589
 590         sdata->sensor_settings =
 591                         (struct st_sensor_settings *)&sensor_settings[i];
 592
 593         return i;
 594 }
 595 EXPORT_SYMBOL(st_sensors_check_device_support);
 596
 597 ssize_t st_sensors_sysfs_sampling_frequency_avail(struct device *dev,
 598                                 struct device_attribute *attr, char *buf)
 599 {
 600         int i, len = 0;
 601         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 602         struct st_sensor_data *sdata = iio_priv(indio_dev);
 603
 604         mutex_lock(&indio_dev->mlock);
 605         for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) {
 606                 if (sdata->sensor_settings->odr.odr_avl[i].hz == 0)
 607                         break;
 608
 609                 len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
 610                                 sdata->sensor_settings->odr.odr_avl[i].hz);
 611         }
 612         mutex_unlock(&indio_dev->mlock);
 613         buf[len - 1] = '\n';
 614
 615         return len;
 616 }
 617 EXPORT_SYMBOL(st_sensors_sysfs_sampling_frequency_avail);
 618
 619 ssize_t st_sensors_sysfs_scale_avail(struct device *dev,
 620                                 struct device_attribute *attr, char *buf)
 621 {
 622         int i, len = 0;
 623         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 624         struct st_sensor_data *sdata = iio_priv(indio_dev);
 625
 626         mutex_lock(&indio_dev->mlock);
 627         for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
 628                 if (sdata->sensor_settings->fs.fs_avl[i].num == 0)
 629                         break;
 630
 631                 len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06u ",
 632                                 sdata->sensor_settings->fs.fs_avl[i].gain);
 633         }
 634         mutex_unlock(&indio_dev->mlock);
 635         buf[len - 1] = '\n';
 636
 637         return len;
 638 }
 639 EXPORT_SYMBOL(st_sensors_sysfs_scale_avail);
 640
 641 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
 642 MODULE_DESCRIPTION("STMicroelectronics ST-sensors core");
 643 MODULE_LICENSE("GPL v2");