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(indio_dev->dev.parent, "vdd");
 238         if (IS_ERR(pdata->vdd)) {
 239                 dev_err(&indio_dev->dev, "unable to get Vdd supply\n");
 240                 return PTR_ERR(pdata->vdd);
 241         }
 242         err = regulator_enable(pdata->vdd);
 243         if (err != 0) {
 244                 dev_warn(&indio_dev->dev,
 245                          "Failed to enable specified Vdd supply\n");
 246                 return err;
 247         }
 248
 249         pdata->vdd_io = devm_regulator_get(indio_dev->dev.parent, "vddio");
 250         if (IS_ERR(pdata->vdd_io)) {
 251                 dev_err(&indio_dev->dev, "unable to get Vdd_IO supply\n");
 252                 err = PTR_ERR(pdata->vdd_io);
 253                 goto st_sensors_disable_vdd;
 254         }
 255         err = regulator_enable(pdata->vdd_io);
 256         if (err != 0) {
 257                 dev_warn(&indio_dev->dev,
 258                          "Failed to enable specified Vdd_IO supply\n");
 259                 goto st_sensors_disable_vdd;
 260         }
 261
 262         return 0;
 263
 264 st_sensors_disable_vdd:
 265         regulator_disable(pdata->vdd);
 266         return err;
 267 }
 268 EXPORT_SYMBOL(st_sensors_power_enable);
 269
 270 void st_sensors_power_disable(struct iio_dev *indio_dev)
 271 {
 272         struct st_sensor_data *pdata = iio_priv(indio_dev);
 273
 274         regulator_disable(pdata->vdd);
 275         regulator_disable(pdata->vdd_io);
 276 }
 277 EXPORT_SYMBOL(st_sensors_power_disable);
 278
 279 static int st_sensors_set_drdy_int_pin(struct iio_dev *indio_dev,
 280                                         struct st_sensors_platform_data *pdata)
 281 {
 282         struct st_sensor_data *sdata = iio_priv(indio_dev);
 283
 284         /* Sensor does not support interrupts */
 285         if (sdata->sensor_settings->drdy_irq.addr == 0) {
 286                 if (pdata->drdy_int_pin)
 287                         dev_info(&indio_dev->dev,
 288                                  "DRDY on pin INT%d specified, but sensor "
 289                                  "does not support interrupts\n",
 290                                  pdata->drdy_int_pin);
 291                 return 0;
 292         }
 293
 294         switch (pdata->drdy_int_pin) {
 295         case 1:
 296                 if (sdata->sensor_settings->drdy_irq.mask_int1 == 0) {
 297                         dev_err(&indio_dev->dev,
 298                                         "DRDY on INT1 not available.\n");
 299                         return -EINVAL;
 300                 }
 301                 sdata->drdy_int_pin = 1;
 302                 break;
 303         case 2:
 304                 if (sdata->sensor_settings->drdy_irq.mask_int2 == 0) {
 305                         dev_err(&indio_dev->dev,
 306                                         "DRDY on INT2 not available.\n");
 307                         return -EINVAL;
 308                 }
 309                 sdata->drdy_int_pin = 2;
 310                 break;
 311         default:
 312                 dev_err(&indio_dev->dev, "DRDY on pdata not valid.\n");
 313                 return -EINVAL;
 314         }
 315
 316         if (pdata->open_drain) {
 317                 if (!sdata->sensor_settings->drdy_irq.addr_od)
 318                         dev_err(&indio_dev->dev,
 319                                 "open drain requested but unsupported.\n");
 320                 else
 321                         sdata->int_pin_open_drain = true;
 322         }
 323
 324         return 0;
 325 }
 326
 327 #ifdef CONFIG_OF
 328 static struct st_sensors_platform_data *st_sensors_of_probe(struct device *dev,
 329                 struct st_sensors_platform_data *defdata)
 330 {
 331         struct st_sensors_platform_data *pdata;
 332         struct device_node *np = dev->of_node;
 333         u32 val;
 334
 335         if (!np)
 336                 return NULL;
 337
 338         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 339         if (!of_property_read_u32(np, "st,drdy-int-pin", &val) && (val <= 2))
 340                 pdata->drdy_int_pin = (u8) val;
 341         else
 342                 pdata->drdy_int_pin = defdata ? defdata->drdy_int_pin : 0;
 343
 344         pdata->open_drain = of_property_read_bool(np, "drive-open-drain");
 345
 346         return pdata;
 347 }
 348 #else
 349 static struct st_sensors_platform_data *st_sensors_of_probe(struct device *dev,
 350                 struct st_sensors_platform_data *defdata)
 351 {
 352         return NULL;
 353 }
 354 #endif
 355
 356 int st_sensors_init_sensor(struct iio_dev *indio_dev,
 357                                         struct st_sensors_platform_data *pdata)
 358 {
 359         struct st_sensor_data *sdata = iio_priv(indio_dev);
 360         struct st_sensors_platform_data *of_pdata;
 361         int err = 0;
 362
 363         /* If OF/DT pdata exists, it will take precedence of anything else */
 364         of_pdata = st_sensors_of_probe(indio_dev->dev.parent, pdata);
 365         if (of_pdata)
 366                 pdata = of_pdata;
 367
 368         if (pdata) {
 369                 err = st_sensors_set_drdy_int_pin(indio_dev, pdata);
 370                 if (err < 0)
 371                         return err;
 372         }
 373
 374         err = st_sensors_set_enable(indio_dev, false);
 375         if (err < 0)
 376                 return err;
 377
 378         /* Disable DRDY, this might be still be enabled after reboot. */
 379         err = st_sensors_set_dataready_irq(indio_dev, false);
 380         if (err < 0)
 381                 return err;
 382
 383         if (sdata->current_fullscale) {
 384                 err = st_sensors_set_fullscale(indio_dev,
 385                                                 sdata->current_fullscale->num);
 386                 if (err < 0)
 387                         return err;
 388         } else
 389                 dev_info(&indio_dev->dev, "Full-scale not possible\n");
 390
 391         err = st_sensors_set_odr(indio_dev, sdata->odr);
 392         if (err < 0)
 393                 return err;
 394
 395         /* set BDU */
 396         if (sdata->sensor_settings->bdu.addr) {
 397                 err = st_sensors_write_data_with_mask(indio_dev,
 398                                         sdata->sensor_settings->bdu.addr,
 399                                         sdata->sensor_settings->bdu.mask, true);
 400                 if (err < 0)
 401                         return err;
 402         }
 403
 404         if (sdata->int_pin_open_drain) {
 405                 dev_info(&indio_dev->dev,
 406                          "set interrupt line to open drain mode\n");
 407                 err = st_sensors_write_data_with_mask(indio_dev,
 408                                 sdata->sensor_settings->drdy_irq.addr_od,
 409                                 sdata->sensor_settings->drdy_irq.mask_od, 1);
 410                 if (err < 0)
 411                         return err;
 412         }
 413
 414         err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
 415
 416         return err;
 417 }
 418 EXPORT_SYMBOL(st_sensors_init_sensor);
 419
 420 int st_sensors_set_dataready_irq(struct iio_dev *indio_dev, bool enable)
 421 {
 422         int err;
 423         u8 drdy_mask;
 424         struct st_sensor_data *sdata = iio_priv(indio_dev);
 425
 426         if (!sdata->sensor_settings->drdy_irq.addr)
 427                 return 0;
 428
 429         /* Enable/Disable the interrupt generator 1. */
 430         if (sdata->sensor_settings->drdy_irq.ig1.en_addr > 0) {
 431                 err = st_sensors_write_data_with_mask(indio_dev,
 432                                 sdata->sensor_settings->drdy_irq.ig1.en_addr,
 433                                 sdata->sensor_settings->drdy_irq.ig1.en_mask,
 434                                 (int)enable);
 435                 if (err < 0)
 436                         goto st_accel_set_dataready_irq_error;
 437         }
 438
 439         if (sdata->drdy_int_pin == 1)
 440                 drdy_mask = sdata->sensor_settings->drdy_irq.mask_int1;
 441         else
 442                 drdy_mask = sdata->sensor_settings->drdy_irq.mask_int2;
 443
 444         /* Flag to the poll function that the hardware trigger is in use */
 445         sdata->hw_irq_trigger = enable;
 446
 447         /* Enable/Disable the interrupt generator for data ready. */
 448         err = st_sensors_write_data_with_mask(indio_dev,
 449                                         sdata->sensor_settings->drdy_irq.addr,
 450                                         drdy_mask, (int)enable);
 451
 452 st_accel_set_dataready_irq_error:
 453         return err;
 454 }
 455 EXPORT_SYMBOL(st_sensors_set_dataready_irq);
 456
 457 int st_sensors_set_fullscale_by_gain(struct iio_dev *indio_dev, int scale)
 458 {
 459         int err = -EINVAL, i;
 460         struct st_sensor_data *sdata = iio_priv(indio_dev);
 461
 462         for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
 463                 if ((sdata->sensor_settings->fs.fs_avl[i].gain == scale) &&
 464                                 (sdata->sensor_settings->fs.fs_avl[i].gain != 0)) {
 465                         err = 0;
 466                         break;
 467                 }
 468         }
 469         if (err < 0)
 470                 goto st_sensors_match_scale_error;
 471
 472         err = st_sensors_set_fullscale(indio_dev,
 473                                 sdata->sensor_settings->fs.fs_avl[i].num);
 474
 475 st_sensors_match_scale_error:
 476         return err;
 477 }
 478 EXPORT_SYMBOL(st_sensors_set_fullscale_by_gain);
 479
 480 static int st_sensors_read_axis_data(struct iio_dev *indio_dev,
 481                                 struct iio_chan_spec const *ch, int *data)
 482 {
 483         int err;
 484         u8 *outdata;
 485         struct st_sensor_data *sdata = iio_priv(indio_dev);
 486         unsigned int byte_for_channel = ch->scan_type.realbits >> 3;
 487
 488         outdata = kmalloc(byte_for_channel, GFP_KERNEL);
 489         if (!outdata)
 490                 return -ENOMEM;
 491
 492         err = sdata->tf->read_multiple_byte(&sdata->tb, sdata->dev,
 493                                 ch->address, byte_for_channel,
 494                                 outdata, sdata->multiread_bit);
 495         if (err < 0)
 496                 goto st_sensors_free_memory;
 497
 498         if (byte_for_channel == 1)
 499                 *data = (s8)*outdata;
 500         else if (byte_for_channel == 2)
 501                 *data = (s16)get_unaligned_le16(outdata);
 502         else if (byte_for_channel == 3)
 503                 *data = (s32)st_sensors_get_unaligned_le24(outdata);
 504
 505 st_sensors_free_memory:
 506         kfree(outdata);
 507
 508         return err;
 509 }
 510
 511 int st_sensors_read_info_raw(struct iio_dev *indio_dev,
 512                                 struct iio_chan_spec const *ch, int *val)
 513 {
 514         int err;
 515         struct st_sensor_data *sdata = iio_priv(indio_dev);
 516
 517         mutex_lock(&indio_dev->mlock);
 518         if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) {
 519                 err = -EBUSY;
 520                 goto out;
 521         } else {
 522                 err = st_sensors_set_enable(indio_dev, true);
 523                 if (err < 0)
 524                         goto out;
 525
 526                 msleep((sdata->sensor_settings->bootime * 1000) / sdata->odr);
 527                 err = st_sensors_read_axis_data(indio_dev, ch, val);
 528                 if (err < 0)
 529                         goto out;
 530
 531                 *val = *val >> ch->scan_type.shift;
 532
 533                 err = st_sensors_set_enable(indio_dev, false);
 534         }
 535 out:
 536         mutex_unlock(&indio_dev->mlock);
 537
 538         return err;
 539 }
 540 EXPORT_SYMBOL(st_sensors_read_info_raw);
 541
 542 int st_sensors_check_device_support(struct iio_dev *indio_dev,
 543                         int num_sensors_list,
 544                         const struct st_sensor_settings *sensor_settings)
 545 {
 546         int i, n, err = 0;
 547         u8 wai;
 548         struct st_sensor_data *sdata = iio_priv(indio_dev);
 549
 550         for (i = 0; i < num_sensors_list; i++) {
 551                 for (n = 0; n < ST_SENSORS_MAX_4WAI; n++) {
 552                         if (strcmp(indio_dev->name,
 553                                 sensor_settings[i].sensors_supported[n]) == 0) {
 554                                 break;
 555                         }
 556                 }
 557                 if (n < ST_SENSORS_MAX_4WAI)
 558                         break;
 559         }
 560         if (i == num_sensors_list) {
 561                 dev_err(&indio_dev->dev, "device name %s not recognized.\n",
 562                                                         indio_dev->name);
 563                 return -ENODEV;
 564         }
 565
 566         if (sensor_settings[i].wai_addr) {
 567                 err = sdata->tf->read_byte(&sdata->tb, sdata->dev,
 568                                            sensor_settings[i].wai_addr, &wai);
 569                 if (err < 0) {
 570                         dev_err(&indio_dev->dev,
 571                                 "failed to read Who-Am-I register.\n");
 572                         return err;
 573                 }
 574
 575                 if (sensor_settings[i].wai != wai) {
 576                         dev_err(&indio_dev->dev,
 577                                 "%s: WhoAmI mismatch (0x%x).\n",
 578                                 indio_dev->name, wai);
 579                         return -EINVAL;
 580                 }
 581         }
 582
 583         sdata->sensor_settings =
 584                         (struct st_sensor_settings *)&sensor_settings[i];
 585
 586         return i;
 587 }
 588 EXPORT_SYMBOL(st_sensors_check_device_support);
 589
 590 ssize_t st_sensors_sysfs_sampling_frequency_avail(struct device *dev,
 591                                 struct device_attribute *attr, char *buf)
 592 {
 593         int i, len = 0;
 594         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 595         struct st_sensor_data *sdata = iio_priv(indio_dev);
 596
 597         mutex_lock(&indio_dev->mlock);
 598         for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) {
 599                 if (sdata->sensor_settings->odr.odr_avl[i].hz == 0)
 600                         break;
 601
 602                 len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
 603                                 sdata->sensor_settings->odr.odr_avl[i].hz);
 604         }
 605         mutex_unlock(&indio_dev->mlock);
 606         buf[len - 1] = '\n';
 607
 608         return len;
 609 }
 610 EXPORT_SYMBOL(st_sensors_sysfs_sampling_frequency_avail);
 611
 612 ssize_t st_sensors_sysfs_scale_avail(struct device *dev,
 613                                 struct device_attribute *attr, char *buf)
 614 {
 615         int i, len = 0;
 616         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 617         struct st_sensor_data *sdata = iio_priv(indio_dev);
 618
 619         mutex_lock(&indio_dev->mlock);
 620         for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
 621                 if (sdata->sensor_settings->fs.fs_avl[i].num == 0)
 622                         break;
 623
 624                 len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06u ",
 625                                 sdata->sensor_settings->fs.fs_avl[i].gain);
 626         }
 627         mutex_unlock(&indio_dev->mlock);
 628         buf[len - 1] = '\n';
 629
 630         return len;
 631 }
 632 EXPORT_SYMBOL(st_sensors_sysfs_scale_avail);
 633
 634 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
 635 MODULE_DESCRIPTION("STMicroelectronics ST-sensors core");
 636 MODULE_LICENSE("GPL v2");