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 <linux/of_device.h>
  19 #include <asm/unaligned.h>
  20 #include <linux/iio/common/st_sensors.h>
  21
  22 #include "st_sensors_core.h"
  23
  24 static inline u32 st_sensors_get_unaligned_le24(const u8 *p)
  25 {
  26         return (s32)((p[0] | p[1] << 8 | p[2] << 16) << 8) >> 8;
  27 }
  28
  29 int st_sensors_write_data_with_mask(struct iio_dev *indio_dev,
  30                                     u8 reg_addr, u8 mask, u8 data)
  31 {
  32         int err;
  33         u8 new_data;
  34         struct st_sensor_data *sdata = iio_priv(indio_dev);
  35
  36         err = sdata->tf->read_byte(&sdata->tb, sdata->dev, reg_addr, &new_data);
  37         if (err < 0)
  38                 goto st_sensors_write_data_with_mask_error;
  39
  40         new_data = ((new_data & (~mask)) | ((data << __ffs(mask)) & mask));
  41         err = sdata->tf->write_byte(&sdata->tb, sdata->dev, reg_addr, new_data);
  42
  43 st_sensors_write_data_with_mask_error:
  44         return err;
  45 }
  46
  47 int st_sensors_debugfs_reg_access(struct iio_dev *indio_dev,
  48                                   unsigned reg, unsigned writeval,
  49                                   unsigned *readval)
  50 {
  51         struct st_sensor_data *sdata = iio_priv(indio_dev);
  52         u8 readdata;
  53         int err;
  54
  55         if (!readval)
  56                 return sdata->tf->write_byte(&sdata->tb, sdata->dev,
  57                                              (u8)reg, (u8)writeval);
  58
  59         err = sdata->tf->read_byte(&sdata->tb, sdata->dev, (u8)reg, &readdata);
  60         if (err < 0)
  61                 return err;
  62
  63         *readval = (unsigned)readdata;
  64
  65         return 0;
  66 }
  67 EXPORT_SYMBOL(st_sensors_debugfs_reg_access);
  68
  69 static int st_sensors_match_odr(struct st_sensor_settings *sensor_settings,
  70                         unsigned int odr, struct st_sensor_odr_avl *odr_out)
  71 {
  72         int i, ret = -EINVAL;
  73
  74         for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) {
  75                 if (sensor_settings->odr.odr_avl[i].hz == 0)
  76                         goto st_sensors_match_odr_error;
  77
  78                 if (sensor_settings->odr.odr_avl[i].hz == odr) {
  79                         odr_out->hz = sensor_settings->odr.odr_avl[i].hz;
  80                         odr_out->value = sensor_settings->odr.odr_avl[i].value;
  81                         ret = 0;
  82                         break;
  83                 }
  84         }
  85
  86 st_sensors_match_odr_error:
  87         return ret;
  88 }
  89
  90 int st_sensors_set_odr(struct iio_dev *indio_dev, unsigned int odr)
  91 {
  92         int err;
  93         struct st_sensor_odr_avl odr_out = {0, 0};
  94         struct st_sensor_data *sdata = iio_priv(indio_dev);
  95
  96         err = st_sensors_match_odr(sdata->sensor_settings, odr, &odr_out);
  97         if (err < 0)
  98                 goto st_sensors_match_odr_error;
  99
 100         if ((sdata->sensor_settings->odr.addr ==
 101                                         sdata->sensor_settings->pw.addr) &&
 102                                 (sdata->sensor_settings->odr.mask ==
 103                                         sdata->sensor_settings->pw.mask)) {
 104                 if (sdata->enabled == true) {
 105                         err = st_sensors_write_data_with_mask(indio_dev,
 106                                 sdata->sensor_settings->odr.addr,
 107                                 sdata->sensor_settings->odr.mask,
 108                                 odr_out.value);
 109                 } else {
 110                         err = 0;
 111                 }
 112         } else {
 113                 err = st_sensors_write_data_with_mask(indio_dev,
 114                         sdata->sensor_settings->odr.addr,
 115                         sdata->sensor_settings->odr.mask,
 116                         odr_out.value);
 117         }
 118         if (err >= 0)
 119                 sdata->odr = odr_out.hz;
 120
 121 st_sensors_match_odr_error:
 122         return err;
 123 }
 124 EXPORT_SYMBOL(st_sensors_set_odr);
 125
 126 static int st_sensors_match_fs(struct st_sensor_settings *sensor_settings,
 127                                         unsigned int fs, int *index_fs_avl)
 128 {
 129         int i, ret = -EINVAL;
 130
 131         for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
 132                 if (sensor_settings->fs.fs_avl[i].num == 0)
 133                         goto st_sensors_match_odr_error;
 134
 135                 if (sensor_settings->fs.fs_avl[i].num == fs) {
 136                         *index_fs_avl = i;
 137                         ret = 0;
 138                         break;
 139                 }
 140         }
 141
 142 st_sensors_match_odr_error:
 143         return ret;
 144 }
 145
 146 static int st_sensors_set_fullscale(struct iio_dev *indio_dev, unsigned int fs)
 147 {
 148         int err, i = 0;
 149         struct st_sensor_data *sdata = iio_priv(indio_dev);
 150
 151         if (sdata->sensor_settings->fs.addr == 0)
 152                 return 0;
 153
 154         err = st_sensors_match_fs(sdata->sensor_settings, fs, &i);
 155         if (err < 0)
 156                 goto st_accel_set_fullscale_error;
 157
 158         err = st_sensors_write_data_with_mask(indio_dev,
 159                                 sdata->sensor_settings->fs.addr,
 160                                 sdata->sensor_settings->fs.mask,
 161                                 sdata->sensor_settings->fs.fs_avl[i].value);
 162         if (err < 0)
 163                 goto st_accel_set_fullscale_error;
 164
 165         sdata->current_fullscale = (struct st_sensor_fullscale_avl *)
 166                                         &sdata->sensor_settings->fs.fs_avl[i];
 167         return err;
 168
 169 st_accel_set_fullscale_error:
 170         dev_err(&indio_dev->dev, "failed to set new fullscale.\n");
 171         return err;
 172 }
 173
 174 int st_sensors_set_enable(struct iio_dev *indio_dev, bool enable)
 175 {
 176         u8 tmp_value;
 177         int err = -EINVAL;
 178         bool found = false;
 179         struct st_sensor_odr_avl odr_out = {0, 0};
 180         struct st_sensor_data *sdata = iio_priv(indio_dev);
 181
 182         if (enable) {
 183                 tmp_value = sdata->sensor_settings->pw.value_on;
 184                 if ((sdata->sensor_settings->odr.addr ==
 185                                         sdata->sensor_settings->pw.addr) &&
 186                                 (sdata->sensor_settings->odr.mask ==
 187                                         sdata->sensor_settings->pw.mask)) {
 188                         err = st_sensors_match_odr(sdata->sensor_settings,
 189                                                         sdata->odr, &odr_out);
 190                         if (err < 0)
 191                                 goto set_enable_error;
 192                         tmp_value = odr_out.value;
 193                         found = true;
 194                 }
 195                 err = st_sensors_write_data_with_mask(indio_dev,
 196                                 sdata->sensor_settings->pw.addr,
 197                                 sdata->sensor_settings->pw.mask, tmp_value);
 198                 if (err < 0)
 199                         goto set_enable_error;
 200
 201                 sdata->enabled = true;
 202
 203                 if (found)
 204                         sdata->odr = odr_out.hz;
 205         } else {
 206                 err = st_sensors_write_data_with_mask(indio_dev,
 207                                 sdata->sensor_settings->pw.addr,
 208                                 sdata->sensor_settings->pw.mask,
 209                                 sdata->sensor_settings->pw.value_off);
 210                 if (err < 0)
 211                         goto set_enable_error;
 212
 213                 sdata->enabled = false;
 214         }
 215
 216 set_enable_error:
 217         return err;
 218 }
 219 EXPORT_SYMBOL(st_sensors_set_enable);
 220
 221 int st_sensors_set_axis_enable(struct iio_dev *indio_dev, u8 axis_enable)
 222 {
 223         struct st_sensor_data *sdata = iio_priv(indio_dev);
 224
 225         return st_sensors_write_data_with_mask(indio_dev,
 226                                 sdata->sensor_settings->enable_axis.addr,
 227                                 sdata->sensor_settings->enable_axis.mask,
 228                                 axis_enable);
 229 }
 230 EXPORT_SYMBOL(st_sensors_set_axis_enable);
 231
 232 int st_sensors_power_enable(struct iio_dev *indio_dev)
 233 {
 234         struct st_sensor_data *pdata = iio_priv(indio_dev);
 235         int err;
 236
 237         /* Regulators not mandatory, but if requested we should enable them. */
 238         pdata->vdd = devm_regulator_get(indio_dev->dev.parent, "vdd");
 239         if (IS_ERR(pdata->vdd)) {
 240                 dev_err(&indio_dev->dev, "unable to get Vdd supply\n");
 241                 return PTR_ERR(pdata->vdd);
 242         }
 243         err = regulator_enable(pdata->vdd);
 244         if (err != 0) {
 245                 dev_warn(&indio_dev->dev,
 246                          "Failed to enable specified Vdd supply\n");
 247                 return err;
 248         }
 249
 250         pdata->vdd_io = devm_regulator_get(indio_dev->dev.parent, "vddio");
 251         if (IS_ERR(pdata->vdd_io)) {
 252                 dev_err(&indio_dev->dev, "unable to get Vdd_IO supply\n");
 253                 err = PTR_ERR(pdata->vdd_io);
 254                 goto st_sensors_disable_vdd;
 255         }
 256         err = regulator_enable(pdata->vdd_io);
 257         if (err != 0) {
 258                 dev_warn(&indio_dev->dev,
 259                          "Failed to enable specified Vdd_IO supply\n");
 260                 goto st_sensors_disable_vdd;
 261         }
 262
 263         return 0;
 264
 265 st_sensors_disable_vdd:
 266         regulator_disable(pdata->vdd);
 267         return err;
 268 }
 269 EXPORT_SYMBOL(st_sensors_power_enable);
 270
 271 void st_sensors_power_disable(struct iio_dev *indio_dev)
 272 {
 273         struct st_sensor_data *pdata = iio_priv(indio_dev);
 274
 275         regulator_disable(pdata->vdd);
 276         regulator_disable(pdata->vdd_io);
 277 }
 278 EXPORT_SYMBOL(st_sensors_power_disable);
 279
 280 static int st_sensors_set_drdy_int_pin(struct iio_dev *indio_dev,
 281                                         struct st_sensors_platform_data *pdata)
 282 {
 283         struct st_sensor_data *sdata = iio_priv(indio_dev);
 284
 285         /* Sensor does not support interrupts */
 286         if (sdata->sensor_settings->drdy_irq.addr == 0) {
 287                 if (pdata->drdy_int_pin)
 288                         dev_info(&indio_dev->dev,
 289                                  "DRDY on pin INT%d specified, but sensor "
 290                                  "does not support interrupts\n",
 291                                  pdata->drdy_int_pin);
 292                 return 0;
 293         }
 294
 295         switch (pdata->drdy_int_pin) {
 296         case 1:
 297                 if (sdata->sensor_settings->drdy_irq.mask_int1 == 0) {
 298                         dev_err(&indio_dev->dev,
 299                                         "DRDY on INT1 not available.\n");
 300                         return -EINVAL;
 301                 }
 302                 sdata->drdy_int_pin = 1;
 303                 break;
 304         case 2:
 305                 if (sdata->sensor_settings->drdy_irq.mask_int2 == 0) {
 306                         dev_err(&indio_dev->dev,
 307                                         "DRDY on INT2 not available.\n");
 308                         return -EINVAL;
 309                 }
 310                 sdata->drdy_int_pin = 2;
 311                 break;
 312         default:
 313                 dev_err(&indio_dev->dev, "DRDY on pdata not valid.\n");
 314                 return -EINVAL;
 315         }
 316
 317         if (pdata->open_drain) {
 318                 if (!sdata->sensor_settings->drdy_irq.addr_od)
 319                         dev_err(&indio_dev->dev,
 320                                 "open drain requested but unsupported.\n");
 321                 else
 322                         sdata->int_pin_open_drain = true;
 323         }
 324
 325         return 0;
 326 }
 327
 328 #ifdef CONFIG_OF
 329 static struct st_sensors_platform_data *st_sensors_of_probe(struct device *dev,
 330                 struct st_sensors_platform_data *defdata)
 331 {
 332         struct st_sensors_platform_data *pdata;
 333         struct device_node *np = dev->of_node;
 334         u32 val;
 335
 336         if (!np)
 337                 return NULL;
 338
 339         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 340         if (!of_property_read_u32(np, "st,drdy-int-pin", &val) && (val <= 2))
 341                 pdata->drdy_int_pin = (u8) val;
 342         else
 343                 pdata->drdy_int_pin = defdata ? defdata->drdy_int_pin : 0;
 344
 345         pdata->open_drain = of_property_read_bool(np, "drive-open-drain");
 346
 347         return pdata;
 348 }
 349
 350 /**
 351  * st_sensors_of_name_probe() - device tree probe for ST sensor name
 352  * @dev: driver model representation of the device.
 353  * @match: the OF match table for the device, containing compatible strings
 354  *      but also a .data field with the corresponding internal kernel name
 355  *      used by this sensor.
 356  * @name: device name buffer reference.
 357  * @len: device name buffer length.
 358  *
 359  * In effect this function matches a compatible string to an internal kernel
 360  * name for a certain sensor device, so that the rest of the autodetection can
 361  * rely on that name from this point on. I2C/SPI devices will be renamed
 362  * to match the internal kernel convention.
 363  */
 364 void st_sensors_of_name_probe(struct device *dev,
 365                               const struct of_device_id *match,
 366                               char *name, int len)
 367 {
 368         const struct of_device_id *of_id;
 369
 370         of_id = of_match_device(match, dev);
 371         if (!of_id || !of_id->data)
 372                 return;
 373
 374         /* The name from the OF match takes precedence if present */
 375         strncpy(name, of_id->data, len);
 376         name[len - 1] = '\0';
 377 }
 378 EXPORT_SYMBOL(st_sensors_of_name_probe);
 379 #else
 380 static struct st_sensors_platform_data *st_sensors_of_probe(struct device *dev,
 381                 struct st_sensors_platform_data *defdata)
 382 {
 383         return NULL;
 384 }
 385 #endif
 386
 387 int st_sensors_init_sensor(struct iio_dev *indio_dev,
 388                                         struct st_sensors_platform_data *pdata)
 389 {
 390         struct st_sensor_data *sdata = iio_priv(indio_dev);
 391         struct st_sensors_platform_data *of_pdata;
 392         int err = 0;
 393
 394         /* If OF/DT pdata exists, it will take precedence of anything else */
 395         of_pdata = st_sensors_of_probe(indio_dev->dev.parent, pdata);
 396         if (of_pdata)
 397                 pdata = of_pdata;
 398
 399         if (pdata) {
 400                 err = st_sensors_set_drdy_int_pin(indio_dev, pdata);
 401                 if (err < 0)
 402                         return err;
 403         }
 404
 405         err = st_sensors_set_enable(indio_dev, false);
 406         if (err < 0)
 407                 return err;
 408
 409         /* Disable DRDY, this might be still be enabled after reboot. */
 410         err = st_sensors_set_dataready_irq(indio_dev, false);
 411         if (err < 0)
 412                 return err;
 413
 414         if (sdata->current_fullscale) {
 415                 err = st_sensors_set_fullscale(indio_dev,
 416                                                 sdata->current_fullscale->num);
 417                 if (err < 0)
 418                         return err;
 419         } else
 420                 dev_info(&indio_dev->dev, "Full-scale not possible\n");
 421
 422         err = st_sensors_set_odr(indio_dev, sdata->odr);
 423         if (err < 0)
 424                 return err;
 425
 426         /* set BDU */
 427         if (sdata->sensor_settings->bdu.addr) {
 428                 err = st_sensors_write_data_with_mask(indio_dev,
 429                                         sdata->sensor_settings->bdu.addr,
 430                                         sdata->sensor_settings->bdu.mask, true);
 431                 if (err < 0)
 432                         return err;
 433         }
 434
 435         /* set DAS */
 436         if (sdata->sensor_settings->das.addr) {
 437                 err = st_sensors_write_data_with_mask(indio_dev,
 438                                         sdata->sensor_settings->das.addr,
 439                                         sdata->sensor_settings->das.mask, 1);
 440                 if (err < 0)
 441                         return err;
 442         }
 443
 444         if (sdata->int_pin_open_drain) {
 445                 dev_info(&indio_dev->dev,
 446                          "set interrupt line to open drain mode\n");
 447                 err = st_sensors_write_data_with_mask(indio_dev,
 448                                 sdata->sensor_settings->drdy_irq.addr_od,
 449                                 sdata->sensor_settings->drdy_irq.mask_od, 1);
 450                 if (err < 0)
 451                         return err;
 452         }
 453
 454         err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
 455
 456         return err;
 457 }
 458 EXPORT_SYMBOL(st_sensors_init_sensor);
 459
 460 int st_sensors_set_dataready_irq(struct iio_dev *indio_dev, bool enable)
 461 {
 462         int err;
 463         u8 drdy_mask;
 464         struct st_sensor_data *sdata = iio_priv(indio_dev);
 465
 466         if (!sdata->sensor_settings->drdy_irq.addr) {
 467                 /*
 468                  * there are some devices (e.g. LIS3MDL) where drdy line is
 469                  * routed to a given pin and it is not possible to select a
 470                  * different one. Take into account irq status register
 471                  * to understand if irq trigger can be properly supported
 472                  */
 473                 if (sdata->sensor_settings->drdy_irq.addr_stat_drdy)
 474                         sdata->hw_irq_trigger = enable;
 475                 return 0;
 476         }
 477
 478         /* Enable/Disable the interrupt generator 1. */
 479         if (sdata->sensor_settings->drdy_irq.ig1.en_addr > 0) {
 480                 err = st_sensors_write_data_with_mask(indio_dev,
 481                                 sdata->sensor_settings->drdy_irq.ig1.en_addr,
 482                                 sdata->sensor_settings->drdy_irq.ig1.en_mask,
 483                                 (int)enable);
 484                 if (err < 0)
 485                         goto st_accel_set_dataready_irq_error;
 486         }
 487
 488         if (sdata->drdy_int_pin == 1)
 489                 drdy_mask = sdata->sensor_settings->drdy_irq.mask_int1;
 490         else
 491                 drdy_mask = sdata->sensor_settings->drdy_irq.mask_int2;
 492
 493         /* Flag to the poll function that the hardware trigger is in use */
 494         sdata->hw_irq_trigger = enable;
 495
 496         /* Enable/Disable the interrupt generator for data ready. */
 497         err = st_sensors_write_data_with_mask(indio_dev,
 498                                         sdata->sensor_settings->drdy_irq.addr,
 499                                         drdy_mask, (int)enable);
 500
 501 st_accel_set_dataready_irq_error:
 502         return err;
 503 }
 504 EXPORT_SYMBOL(st_sensors_set_dataready_irq);
 505
 506 int st_sensors_set_fullscale_by_gain(struct iio_dev *indio_dev, int scale)
 507 {
 508         int err = -EINVAL, i;
 509         struct st_sensor_data *sdata = iio_priv(indio_dev);
 510
 511         for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
 512                 if ((sdata->sensor_settings->fs.fs_avl[i].gain == scale) &&
 513                                 (sdata->sensor_settings->fs.fs_avl[i].gain != 0)) {
 514                         err = 0;
 515                         break;
 516                 }
 517         }
 518         if (err < 0)
 519                 goto st_sensors_match_scale_error;
 520
 521         err = st_sensors_set_fullscale(indio_dev,
 522                                 sdata->sensor_settings->fs.fs_avl[i].num);
 523
 524 st_sensors_match_scale_error:
 525         return err;
 526 }
 527 EXPORT_SYMBOL(st_sensors_set_fullscale_by_gain);
 528
 529 static int st_sensors_read_axis_data(struct iio_dev *indio_dev,
 530                                 struct iio_chan_spec const *ch, int *data)
 531 {
 532         int err;
 533         u8 *outdata;
 534         struct st_sensor_data *sdata = iio_priv(indio_dev);
 535         unsigned int byte_for_channel;
 536
 537         byte_for_channel = DIV_ROUND_UP(ch->scan_type.realbits +
 538                                         ch->scan_type.shift, 8);
 539         outdata = kmalloc(byte_for_channel, GFP_KERNEL);
 540         if (!outdata)
 541                 return -ENOMEM;
 542
 543         err = sdata->tf->read_multiple_byte(&sdata->tb, sdata->dev,
 544                                 ch->address, byte_for_channel,
 545                                 outdata, sdata->multiread_bit);
 546         if (err < 0)
 547                 goto st_sensors_free_memory;
 548
 549         if (byte_for_channel == 1)
 550                 *data = (s8)*outdata;
 551         else if (byte_for_channel == 2)
 552                 *data = (s16)get_unaligned_le16(outdata);
 553         else if (byte_for_channel == 3)
 554                 *data = (s32)st_sensors_get_unaligned_le24(outdata);
 555
 556 st_sensors_free_memory:
 557         kfree(outdata);
 558
 559         return err;
 560 }
 561
 562 int st_sensors_read_info_raw(struct iio_dev *indio_dev,
 563                                 struct iio_chan_spec const *ch, int *val)
 564 {
 565         int err;
 566         struct st_sensor_data *sdata = iio_priv(indio_dev);
 567
 568         mutex_lock(&indio_dev->mlock);
 569         if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) {
 570                 err = -EBUSY;
 571                 goto out;
 572         } else {
 573                 err = st_sensors_set_enable(indio_dev, true);
 574                 if (err < 0)
 575                         goto out;
 576
 577                 msleep((sdata->sensor_settings->bootime * 1000) / sdata->odr);
 578                 err = st_sensors_read_axis_data(indio_dev, ch, val);
 579                 if (err < 0)
 580                         goto out;
 581
 582                 *val = *val >> ch->scan_type.shift;
 583
 584                 err = st_sensors_set_enable(indio_dev, false);
 585         }
 586 out:
 587         mutex_unlock(&indio_dev->mlock);
 588
 589         return err;
 590 }
 591 EXPORT_SYMBOL(st_sensors_read_info_raw);
 592
 593 static int st_sensors_init_interface_mode(struct iio_dev *indio_dev,
 594                         const struct st_sensor_settings *sensor_settings)
 595 {
 596         struct st_sensor_data *sdata = iio_priv(indio_dev);
 597         struct device_node *np = sdata->dev->of_node;
 598         struct st_sensors_platform_data *pdata;
 599
 600         pdata = (struct st_sensors_platform_data *)sdata->dev->platform_data;
 601         if (((np && of_property_read_bool(np, "spi-3wire")) ||
 602              (pdata && pdata->spi_3wire)) && sensor_settings->sim.addr) {
 603                 int err;
 604
 605                 err = sdata->tf->write_byte(&sdata->tb, sdata->dev,
 606                                             sensor_settings->sim.addr,
 607                                             sensor_settings->sim.value);
 608                 if (err < 0) {
 609                         dev_err(&indio_dev->dev,
 610                                 "failed to init interface mode\n");
 611                         return err;
 612                 }
 613         }
 614
 615         return 0;
 616 }
 617
 618 int st_sensors_check_device_support(struct iio_dev *indio_dev,
 619                         int num_sensors_list,
 620                         const struct st_sensor_settings *sensor_settings)
 621 {
 622         int i, n, err = 0;
 623         u8 wai;
 624         struct st_sensor_data *sdata = iio_priv(indio_dev);
 625
 626         for (i = 0; i < num_sensors_list; i++) {
 627                 for (n = 0; n < ST_SENSORS_MAX_4WAI; n++) {
 628                         if (strcmp(indio_dev->name,
 629                                 sensor_settings[i].sensors_supported[n]) == 0) {
 630                                 break;
 631                         }
 632                 }
 633                 if (n < ST_SENSORS_MAX_4WAI)
 634                         break;
 635         }
 636         if (i == num_sensors_list) {
 637                 dev_err(&indio_dev->dev, "device name %s not recognized.\n",
 638                                                         indio_dev->name);
 639                 return -ENODEV;
 640         }
 641
 642         err = st_sensors_init_interface_mode(indio_dev, &sensor_settings[i]);
 643         if (err < 0)
 644                 return err;
 645
 646         if (sensor_settings[i].wai_addr) {
 647                 err = sdata->tf->read_byte(&sdata->tb, sdata->dev,
 648                                            sensor_settings[i].wai_addr, &wai);
 649                 if (err < 0) {
 650                         dev_err(&indio_dev->dev,
 651                                 "failed to read Who-Am-I register.\n");
 652                         return err;
 653                 }
 654
 655                 if (sensor_settings[i].wai != wai) {
 656                         dev_err(&indio_dev->dev,
 657                                 "%s: WhoAmI mismatch (0x%x).\n",
 658                                 indio_dev->name, wai);
 659                         return -EINVAL;
 660                 }
 661         }
 662
 663         sdata->sensor_settings =
 664                         (struct st_sensor_settings *)&sensor_settings[i];
 665
 666         return i;
 667 }
 668 EXPORT_SYMBOL(st_sensors_check_device_support);
 669
 670 ssize_t st_sensors_sysfs_sampling_frequency_avail(struct device *dev,
 671                                 struct device_attribute *attr, char *buf)
 672 {
 673         int i, len = 0;
 674         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 675         struct st_sensor_data *sdata = iio_priv(indio_dev);
 676
 677         mutex_lock(&indio_dev->mlock);
 678         for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) {
 679                 if (sdata->sensor_settings->odr.odr_avl[i].hz == 0)
 680                         break;
 681
 682                 len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
 683                                 sdata->sensor_settings->odr.odr_avl[i].hz);
 684         }
 685         mutex_unlock(&indio_dev->mlock);
 686         buf[len - 1] = '\n';
 687
 688         return len;
 689 }
 690 EXPORT_SYMBOL(st_sensors_sysfs_sampling_frequency_avail);
 691
 692 ssize_t st_sensors_sysfs_scale_avail(struct device *dev,
 693                                 struct device_attribute *attr, char *buf)
 694 {
 695         int i, len = 0, q, r;
 696         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 697         struct st_sensor_data *sdata = iio_priv(indio_dev);
 698
 699         mutex_lock(&indio_dev->mlock);
 700         for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
 701                 if (sdata->sensor_settings->fs.fs_avl[i].num == 0)
 702                         break;
 703
 704                 q = sdata->sensor_settings->fs.fs_avl[i].gain / 1000000;
 705                 r = sdata->sensor_settings->fs.fs_avl[i].gain % 1000000;
 706
 707                 len += scnprintf(buf + len, PAGE_SIZE - len, "%u.%06u ", q, r);
 708         }
 709         mutex_unlock(&indio_dev->mlock);
 710         buf[len - 1] = '\n';
 711
 712         return len;
 713 }
 714 EXPORT_SYMBOL(st_sensors_sysfs_scale_avail);
 715
 716 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
 717 MODULE_DESCRIPTION("STMicroelectronics ST-sensors core");
 718 MODULE_LICENSE("GPL v2");