drivers/iio/pressure/st_pressure_core.c

   1 /*
   2  * STMicroelectronics pressures driver
   3  *
   4  * Copyright 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/errno.h>
  15 #include <linux/types.h>
  16 #include <linux/mutex.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/i2c.h>
  19 #include <linux/gpio.h>
  20 #include <linux/irq.h>
  21 #include <linux/delay.h>
  22 #include <linux/iio/iio.h>
  23 #include <linux/iio/sysfs.h>
  24 #include <linux/iio/trigger.h>
  25 #include <linux/iio/buffer.h>
  26 #include <asm/unaligned.h>
  27
  28 #include <linux/iio/common/st_sensors.h>
  29 #include "st_pressure.h"
  30
  31 /*
  32  * About determining pressure scaling factors
  33  * ------------------------------------------
  34  *
  35  * Datasheets specify typical pressure sensitivity so that pressure is computed
  36  * according to the following equation :
  37  *     pressure[mBar] = raw / sensitivity
  38  * where :
  39  *     raw          the 24 bits long raw sampled pressure
  40  *     sensitivity  a scaling factor specified by the datasheet in LSB/mBar
  41  *
  42  * IIO ABI expects pressure to be expressed as kPascal, hence pressure should be
  43  * computed according to :
  44  *     pressure[kPascal] = pressure[mBar] / 10
  45  *                       = raw / (sensitivity * 10)                          (1)
  46  *
  47  * Finally, st_press_read_raw() returns pressure scaling factor as an
  48  * IIO_VAL_INT_PLUS_NANO with a zero integral part and "gain" as decimal part.
  49  * Therefore, from (1), "gain" becomes :
  50  *     gain = 10^9 / (sensitivity * 10)
  51  *          = 10^8 / sensitivity
  52  *
  53  * About determining temperature scaling factors and offsets
  54  * ---------------------------------------------------------
  55  *
  56  * Datasheets specify typical temperature sensitivity and offset so that
  57  * temperature is computed according to the following equation :
  58  *     temp[Celsius] = offset[Celsius] + (raw / sensitivity)
  59  * where :
  60  *     raw          the 16 bits long raw sampled temperature
  61  *     offset       a constant specified by the datasheet in degree Celsius
  62  *                  (sometimes zero)
  63  *     sensitivity  a scaling factor specified by the datasheet in LSB/Celsius
  64  *
  65  * IIO ABI expects temperature to be expressed as milli degree Celsius such as
  66  * user space should compute temperature according to :
  67  *     temp[mCelsius] = temp[Celsius] * 10^3
  68  *                    = (offset[Celsius] + (raw / sensitivity)) * 10^3
  69  *                    = ((offset[Celsius] * sensitivity) + raw) *
  70  *                      (10^3 / sensitivity)                                 (2)
  71  *
  72  * IIO ABI expects user space to apply offset and scaling factors to raw samples
  73  * according to :
  74  *     temp[mCelsius] = (OFFSET + raw) * SCALE
  75  * where :
  76  *     OFFSET an arbitrary constant exposed by device
  77  *     SCALE  an arbitrary scaling factor exposed by device
  78  *
  79  * Matching OFFSET and SCALE with members of (2) gives :
  80  *     OFFSET = offset[Celsius] * sensitivity                                (3)
  81  *     SCALE  = 10^3 / sensitivity                                           (4)
  82  *
  83  * st_press_read_raw() returns temperature scaling factor as an
  84  * IIO_VAL_FRACTIONAL with a 10^3 numerator and "gain2" as denominator.
  85  * Therefore, from (3), "gain2" becomes :
  86  *     gain2 = sensitivity
  87  *
  88  * When declared within channel, i.e. for a non zero specified offset,
  89  * st_press_read_raw() will return the latter as an IIO_VAL_FRACTIONAL such as :
  90  *     numerator = OFFSET * 10^3
  91  *     denominator = 10^3
  92  * giving from (4):
  93  *     numerator = offset[Celsius] * 10^3 * sensitivity
  94  *               = offset[mCelsius] * gain2
  95  */
  96
  97 #define MCELSIUS_PER_CELSIUS                    1000
  98
  99 /* Default pressure sensitivity */
 100 #define ST_PRESS_LSB_PER_MBAR                   4096UL
 101 #define ST_PRESS_KPASCAL_NANO_SCALE             (100000000UL / \
 102                                                  ST_PRESS_LSB_PER_MBAR)
 103
 104 /* Default temperature sensitivity */
 105 #define ST_PRESS_LSB_PER_CELSIUS                480UL
 106 #define ST_PRESS_MILLI_CELSIUS_OFFSET           42500UL
 107
 108 /* FULLSCALE */
 109 #define ST_PRESS_FS_AVL_1100MB                  1100
 110 #define ST_PRESS_FS_AVL_1260MB                  1260
 111
 112 #define ST_PRESS_1_OUT_XL_ADDR                  0x28
 113 #define ST_TEMP_1_OUT_L_ADDR                    0x2b
 114
 115 /* LPS001WP pressure resolution */
 116 #define ST_PRESS_LPS001WP_LSB_PER_MBAR          16UL
 117 /* LPS001WP temperature resolution */
 118 #define ST_PRESS_LPS001WP_LSB_PER_CELSIUS       64UL
 119 /* LPS001WP pressure gain */
 120 #define ST_PRESS_LPS001WP_FS_AVL_PRESS_GAIN \
 121         (100000000UL / ST_PRESS_LPS001WP_LSB_PER_MBAR)
 122 /* LPS001WP pressure and temp L addresses */
 123 #define ST_PRESS_LPS001WP_OUT_L_ADDR            0x28
 124 #define ST_TEMP_LPS001WP_OUT_L_ADDR             0x2a
 125
 126 /* LPS25H pressure and temp L addresses */
 127 #define ST_PRESS_LPS25H_OUT_XL_ADDR             0x28
 128 #define ST_TEMP_LPS25H_OUT_L_ADDR               0x2b
 129
 130 /* LPS22HB temperature sensitivity */
 131 #define ST_PRESS_LPS22HB_LSB_PER_CELSIUS        100UL
 132
 133 static const struct iio_chan_spec st_press_1_channels[] = {
 134         {
 135                 .type = IIO_PRESSURE,
 136                 .address = ST_PRESS_1_OUT_XL_ADDR,
 137                 .scan_index = 0,
 138                 .scan_type = {
 139                         .sign = 's',
 140                         .realbits = 24,
 141                         .storagebits = 32,
 142                         .endianness = IIO_LE,
 143                 },
 144                 .info_mask_separate =
 145                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
 146                 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
 147         },
 148         {
 149                 .type = IIO_TEMP,
 150                 .address = ST_TEMP_1_OUT_L_ADDR,
 151                 .scan_index = 1,
 152                 .scan_type = {
 153                         .sign = 's',
 154                         .realbits = 16,
 155                         .storagebits = 16,
 156                         .endianness = IIO_LE,
 157                 },
 158                 .info_mask_separate =
 159                         BIT(IIO_CHAN_INFO_RAW) |
 160                         BIT(IIO_CHAN_INFO_SCALE) |
 161                         BIT(IIO_CHAN_INFO_OFFSET),
 162                 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
 163         },
 164         IIO_CHAN_SOFT_TIMESTAMP(2)
 165 };
 166
 167 static const struct iio_chan_spec st_press_lps001wp_channels[] = {
 168         {
 169                 .type = IIO_PRESSURE,
 170                 .address = ST_PRESS_LPS001WP_OUT_L_ADDR,
 171                 .scan_index = 0,
 172                 .scan_type = {
 173                         .sign = 's',
 174                         .realbits = 16,
 175                         .storagebits = 16,
 176                         .endianness = IIO_LE,
 177                 },
 178                 .info_mask_separate =
 179                         BIT(IIO_CHAN_INFO_RAW) |
 180                         BIT(IIO_CHAN_INFO_SCALE),
 181         },
 182         {
 183                 .type = IIO_TEMP,
 184                 .address = ST_TEMP_LPS001WP_OUT_L_ADDR,
 185                 .scan_index = 1,
 186                 .scan_type = {
 187                         .sign = 's',
 188                         .realbits = 16,
 189                         .storagebits = 16,
 190                         .endianness = IIO_LE,
 191                 },
 192                 .info_mask_separate =
 193                         BIT(IIO_CHAN_INFO_RAW) |
 194                         BIT(IIO_CHAN_INFO_SCALE),
 195         },
 196         IIO_CHAN_SOFT_TIMESTAMP(2)
 197 };
 198
 199 static const struct iio_chan_spec st_press_lps22hb_channels[] = {
 200         {
 201                 .type = IIO_PRESSURE,
 202                 .address = ST_PRESS_1_OUT_XL_ADDR,
 203                 .scan_index = 0,
 204                 .scan_type = {
 205                         .sign = 's',
 206                         .realbits = 24,
 207                         .storagebits = 32,
 208                         .endianness = IIO_LE,
 209                 },
 210                 .info_mask_separate =
 211                         BIT(IIO_CHAN_INFO_RAW) |
 212                         BIT(IIO_CHAN_INFO_SCALE),
 213                 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
 214         },
 215         {
 216                 .type = IIO_TEMP,
 217                 .address = ST_TEMP_1_OUT_L_ADDR,
 218                 .scan_index = 1,
 219                 .scan_type = {
 220                         .sign = 's',
 221                         .realbits = 16,
 222                         .storagebits = 16,
 223                         .endianness = IIO_LE,
 224                 },
 225                 .info_mask_separate =
 226                         BIT(IIO_CHAN_INFO_RAW) |
 227                         BIT(IIO_CHAN_INFO_SCALE),
 228                 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
 229         },
 230         IIO_CHAN_SOFT_TIMESTAMP(2)
 231 };
 232
 233 static const struct st_sensor_settings st_press_sensors_settings[] = {
 234         {
 235                 /*
 236                  * CUSTOM VALUES FOR LPS331AP SENSOR
 237                  * See LPS331AP datasheet:
 238                  * http://www2.st.com/resource/en/datasheet/lps331ap.pdf
 239                  */
 240                 .wai = 0xbb,
 241                 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
 242                 .sensors_supported = {
 243                         [0] = LPS331AP_PRESS_DEV_NAME,
 244                 },
 245                 .ch = (struct iio_chan_spec *)st_press_1_channels,
 246                 .num_ch = ARRAY_SIZE(st_press_1_channels),
 247                 .odr = {
 248                         .addr = 0x20,
 249                         .mask = 0x70,
 250                         .odr_avl = {
 251                                 { .hz = 1, .value = 0x01 },
 252                                 { .hz = 7, .value = 0x05 },
 253                                 { .hz = 13, .value = 0x06 },
 254                                 { .hz = 25, .value = 0x07 },
 255                         },
 256                 },
 257                 .pw = {
 258                         .addr = 0x20,
 259                         .mask = 0x80,
 260                         .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
 261                         .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
 262                 },
 263                 .fs = {
 264                         .addr = 0x23,
 265                         .mask = 0x30,
 266                         .fs_avl = {
 267                                 /*
 268                                  * Pressure and temperature sensitivity values
 269                                  * as defined in table 3 of LPS331AP datasheet.
 270                                  */
 271                                 [0] = {
 272                                         .num = ST_PRESS_FS_AVL_1260MB,
 273                                         .gain = ST_PRESS_KPASCAL_NANO_SCALE,
 274                                         .gain2 = ST_PRESS_LSB_PER_CELSIUS,
 275                                 },
 276                         },
 277                 },
 278                 .bdu = {
 279                         .addr = 0x20,
 280                         .mask = 0x04,
 281                 },
 282                 .drdy_irq = {
 283                         .addr = 0x22,
 284                         .mask_int1 = 0x04,
 285                         .mask_int2 = 0x20,
 286                         .addr_ihl = 0x22,
 287                         .mask_ihl = 0x80,
 288                         .addr_od = 0x22,
 289                         .mask_od = 0x40,
 290                         .addr_stat_drdy = ST_SENSORS_DEFAULT_STAT_ADDR,
 291                 },
 292                 .multi_read_bit = true,
 293                 .bootime = 2,
 294         },
 295         {
 296                 /*
 297                  * CUSTOM VALUES FOR LPS001WP SENSOR
 298                  */
 299                 .wai = 0xba,
 300                 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
 301                 .sensors_supported = {
 302                         [0] = LPS001WP_PRESS_DEV_NAME,
 303                 },
 304                 .ch = (struct iio_chan_spec *)st_press_lps001wp_channels,
 305                 .num_ch = ARRAY_SIZE(st_press_lps001wp_channels),
 306                 .odr = {
 307                         .addr = 0x20,
 308                         .mask = 0x30,
 309                         .odr_avl = {
 310                                 { .hz = 1, .value = 0x01 },
 311                                 { .hz = 7, .value = 0x02 },
 312                                 { .hz = 13, .value = 0x03 },
 313                         },
 314                 },
 315                 .pw = {
 316                         .addr = 0x20,
 317                         .mask = 0x40,
 318                         .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
 319                         .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
 320                 },
 321                 .fs = {
 322                         .fs_avl = {
 323                                 /*
 324                                  * Pressure and temperature resolution values
 325                                  * as defined in table 3 of LPS001WP datasheet.
 326                                  */
 327                                 [0] = {
 328                                         .num = ST_PRESS_FS_AVL_1100MB,
 329                                         .gain = ST_PRESS_LPS001WP_FS_AVL_PRESS_GAIN,
 330                                         .gain2 = ST_PRESS_LPS001WP_LSB_PER_CELSIUS,
 331                                 },
 332                         },
 333                 },
 334                 .bdu = {
 335                         .addr = 0x20,
 336                         .mask = 0x04,
 337                 },
 338                 .drdy_irq = {
 339                         .addr = 0,
 340                 },
 341                 .multi_read_bit = true,
 342                 .bootime = 2,
 343         },
 344         {
 345                 /*
 346                  * CUSTOM VALUES FOR LPS25H SENSOR
 347                  * See LPS25H datasheet:
 348                  * http://www2.st.com/resource/en/datasheet/lps25h.pdf
 349                  */
 350                 .wai = 0xbd,
 351                 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
 352                 .sensors_supported = {
 353                         [0] = LPS25H_PRESS_DEV_NAME,
 354                 },
 355                 .ch = (struct iio_chan_spec *)st_press_1_channels,
 356                 .num_ch = ARRAY_SIZE(st_press_1_channels),
 357                 .odr = {
 358                         .addr = 0x20,
 359                         .mask = 0x70,
 360                         .odr_avl = {
 361                                 { .hz = 1, .value = 0x01 },
 362                                 { .hz = 7, .value = 0x02 },
 363                                 { .hz = 13, .value = 0x03 },
 364                                 { .hz = 25, .value = 0x04 },
 365                         },
 366                 },
 367                 .pw = {
 368                         .addr = 0x20,
 369                         .mask = 0x80,
 370                         .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
 371                         .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
 372                 },
 373                 .fs = {
 374                         .fs_avl = {
 375                                 /*
 376                                  * Pressure and temperature sensitivity values
 377                                  * as defined in table 3 of LPS25H datasheet.
 378                                  */
 379                                 [0] = {
 380                                         .num = ST_PRESS_FS_AVL_1260MB,
 381                                         .gain = ST_PRESS_KPASCAL_NANO_SCALE,
 382                                         .gain2 = ST_PRESS_LSB_PER_CELSIUS,
 383                                 },
 384                         },
 385                 },
 386                 .bdu = {
 387                         .addr = 0x20,
 388                         .mask = 0x04,
 389                 },
 390                 .drdy_irq = {
 391                         .addr = 0x23,
 392                         .mask_int1 = 0x01,
 393                         .mask_int2 = 0x10,
 394                         .addr_ihl = 0x22,
 395                         .mask_ihl = 0x80,
 396                         .addr_od = 0x22,
 397                         .mask_od = 0x40,
 398                         .addr_stat_drdy = ST_SENSORS_DEFAULT_STAT_ADDR,
 399                 },
 400                 .multi_read_bit = true,
 401                 .bootime = 2,
 402         },
 403         {
 404                 /*
 405                  * CUSTOM VALUES FOR LPS22HB SENSOR
 406                  * See LPS22HB datasheet:
 407                  * http://www2.st.com/resource/en/datasheet/lps22hb.pdf
 408                  */
 409                 .wai = 0xb1,
 410                 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
 411                 .sensors_supported = {
 412                         [0] = LPS22HB_PRESS_DEV_NAME,
 413                 },
 414                 .ch = (struct iio_chan_spec *)st_press_lps22hb_channels,
 415                 .num_ch = ARRAY_SIZE(st_press_lps22hb_channels),
 416                 .odr = {
 417                         .addr = 0x10,
 418                         .mask = 0x70,
 419                         .odr_avl = {
 420                                 { .hz = 1, .value = 0x01 },
 421                                 { .hz = 10, .value = 0x02 },
 422                                 { .hz = 25, .value = 0x03 },
 423                                 { .hz = 50, .value = 0x04 },
 424                                 { .hz = 75, .value = 0x05 },
 425                         },
 426                 },
 427                 .pw = {
 428                         .addr = 0x10,
 429                         .mask = 0x70,
 430                         .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
 431                 },
 432                 .fs = {
 433                         .fs_avl = {
 434                                 /*
 435                                  * Pressure and temperature sensitivity values
 436                                  * as defined in table 3 of LPS22HB datasheet.
 437                                  */
 438                                 [0] = {
 439                                         .num = ST_PRESS_FS_AVL_1260MB,
 440                                         .gain = ST_PRESS_KPASCAL_NANO_SCALE,
 441                                         .gain2 = ST_PRESS_LPS22HB_LSB_PER_CELSIUS,
 442                                 },
 443                         },
 444                 },
 445                 .bdu = {
 446                         .addr = 0x10,
 447                         .mask = 0x02,
 448                 },
 449                 .drdy_irq = {
 450                         .addr = 0x12,
 451                         .mask_int1 = 0x04,
 452                         .mask_int2 = 0x08,
 453                         .addr_ihl = 0x12,
 454                         .mask_ihl = 0x80,
 455                         .addr_od = 0x12,
 456                         .mask_od = 0x40,
 457                         .addr_stat_drdy = ST_SENSORS_DEFAULT_STAT_ADDR,
 458                 },
 459                 .multi_read_bit = true,
 460                 .bootime = 2,
 461         },
 462 };
 463
 464 static int st_press_write_raw(struct iio_dev *indio_dev,
 465                               struct iio_chan_spec const *ch,
 466                               int val,
 467                               int val2,
 468                               long mask)
 469 {
 470         int err;
 471
 472         switch (mask) {
 473         case IIO_CHAN_INFO_SAMP_FREQ:
 474                 if (val2)
 475                         return -EINVAL;
 476                 mutex_lock(&indio_dev->mlock);
 477                 err = st_sensors_set_odr(indio_dev, val);
 478                 mutex_unlock(&indio_dev->mlock);
 479                 return err;
 480         default:
 481                 return -EINVAL;
 482         }
 483 }
 484
 485 static int st_press_read_raw(struct iio_dev *indio_dev,
 486                         struct iio_chan_spec const *ch, int *val,
 487                                                         int *val2, long mask)
 488 {
 489         int err;
 490         struct st_sensor_data *press_data = iio_priv(indio_dev);
 491
 492         switch (mask) {
 493         case IIO_CHAN_INFO_RAW:
 494                 err = st_sensors_read_info_raw(indio_dev, ch, val);
 495                 if (err < 0)
 496                         goto read_error;
 497
 498                 return IIO_VAL_INT;
 499         case IIO_CHAN_INFO_SCALE:
 500                 switch (ch->type) {
 501                 case IIO_PRESSURE:
 502                         *val = 0;
 503                         *val2 = press_data->current_fullscale->gain;
 504                         return IIO_VAL_INT_PLUS_NANO;
 505                 case IIO_TEMP:
 506                         *val = MCELSIUS_PER_CELSIUS;
 507                         *val2 = press_data->current_fullscale->gain2;
 508                         return IIO_VAL_FRACTIONAL;
 509                 default:
 510                         err = -EINVAL;
 511                         goto read_error;
 512                 }
 513
 514         case IIO_CHAN_INFO_OFFSET:
 515                 switch (ch->type) {
 516                 case IIO_TEMP:
 517                         *val = ST_PRESS_MILLI_CELSIUS_OFFSET *
 518                                press_data->current_fullscale->gain2;
 519                         *val2 = MCELSIUS_PER_CELSIUS;
 520                         break;
 521                 default:
 522                         err = -EINVAL;
 523                         goto read_error;
 524                 }
 525
 526                 return IIO_VAL_FRACTIONAL;
 527         case IIO_CHAN_INFO_SAMP_FREQ:
 528                 *val = press_data->odr;
 529                 return IIO_VAL_INT;
 530         default:
 531                 return -EINVAL;
 532         }
 533
 534 read_error:
 535         return err;
 536 }
 537
 538 static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();
 539
 540 static struct attribute *st_press_attributes[] = {
 541         &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
 542         NULL,
 543 };
 544
 545 static const struct attribute_group st_press_attribute_group = {
 546         .attrs = st_press_attributes,
 547 };
 548
 549 static const struct iio_info press_info = {
 550         .driver_module = THIS_MODULE,
 551         .attrs = &st_press_attribute_group,
 552         .read_raw = &st_press_read_raw,
 553         .write_raw = &st_press_write_raw,
 554         .debugfs_reg_access = &st_sensors_debugfs_reg_access,
 555 };
 556
 557 #ifdef CONFIG_IIO_TRIGGER
 558 static const struct iio_trigger_ops st_press_trigger_ops = {
 559         .owner = THIS_MODULE,
 560         .set_trigger_state = ST_PRESS_TRIGGER_SET_STATE,
 561         .validate_device = st_sensors_validate_device,
 562 };
 563 #define ST_PRESS_TRIGGER_OPS (&st_press_trigger_ops)
 564 #else
 565 #define ST_PRESS_TRIGGER_OPS NULL
 566 #endif
 567
 568 int st_press_common_probe(struct iio_dev *indio_dev)
 569 {
 570         struct st_sensor_data *press_data = iio_priv(indio_dev);
 571         struct st_sensors_platform_data *pdata =
 572                 (struct st_sensors_platform_data *)press_data->dev->platform_data;
 573         int irq = press_data->get_irq_data_ready(indio_dev);
 574         int err;
 575
 576         indio_dev->modes = INDIO_DIRECT_MODE;
 577         indio_dev->info = &press_info;
 578         mutex_init(&press_data->tb.buf_lock);
 579
 580         err = st_sensors_power_enable(indio_dev);
 581         if (err)
 582                 return err;
 583
 584         err = st_sensors_check_device_support(indio_dev,
 585                                         ARRAY_SIZE(st_press_sensors_settings),
 586                                         st_press_sensors_settings);
 587         if (err < 0)
 588                 goto st_press_power_off;
 589
 590         /*
 591          * Skip timestamping channel while declaring available channels to
 592          * common st_sensor layer. Look at st_sensors_get_buffer_element() to
 593          * see how timestamps are explicitly pushed as last samples block
 594          * element.
 595          */
 596         press_data->num_data_channels = press_data->sensor_settings->num_ch - 1;
 597         press_data->multiread_bit = press_data->sensor_settings->multi_read_bit;
 598         indio_dev->channels = press_data->sensor_settings->ch;
 599         indio_dev->num_channels = press_data->sensor_settings->num_ch;
 600
 601         press_data->current_fullscale =
 602                 (struct st_sensor_fullscale_avl *)
 603                         &press_data->sensor_settings->fs.fs_avl[0];
 604
 605         press_data->odr = press_data->sensor_settings->odr.odr_avl[0].hz;
 606
 607         /* Some devices don't support a data ready pin. */
 608         if (!pdata && press_data->sensor_settings->drdy_irq.addr)
 609                 pdata = (struct st_sensors_platform_data *)&default_press_pdata;
 610
 611         err = st_sensors_init_sensor(indio_dev, press_data->dev->platform_data);
 612         if (err < 0)
 613                 goto st_press_power_off;
 614
 615         err = st_press_allocate_ring(indio_dev);
 616         if (err < 0)
 617                 goto st_press_power_off;
 618
 619         if (irq > 0) {
 620                 err = st_sensors_allocate_trigger(indio_dev,
 621                                                   ST_PRESS_TRIGGER_OPS);
 622                 if (err < 0)
 623                         goto st_press_probe_trigger_error;
 624         }
 625
 626         err = iio_device_register(indio_dev);
 627         if (err)
 628                 goto st_press_device_register_error;
 629
 630         dev_info(&indio_dev->dev, "registered pressure sensor %s\n",
 631                  indio_dev->name);
 632
 633         return err;
 634
 635 st_press_device_register_error:
 636         if (irq > 0)
 637                 st_sensors_deallocate_trigger(indio_dev);
 638 st_press_probe_trigger_error:
 639         st_press_deallocate_ring(indio_dev);
 640 st_press_power_off:
 641         st_sensors_power_disable(indio_dev);
 642
 643         return err;
 644 }
 645 EXPORT_SYMBOL(st_press_common_probe);
 646
 647 void st_press_common_remove(struct iio_dev *indio_dev)
 648 {
 649         struct st_sensor_data *press_data = iio_priv(indio_dev);
 650
 651         st_sensors_power_disable(indio_dev);
 652
 653         iio_device_unregister(indio_dev);
 654         if (press_data->get_irq_data_ready(indio_dev) > 0)
 655                 st_sensors_deallocate_trigger(indio_dev);
 656
 657         st_press_deallocate_ring(indio_dev);
 658 }
 659 EXPORT_SYMBOL(st_press_common_remove);
 660
 661 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
 662 MODULE_DESCRIPTION("STMicroelectronics pressures driver");
 663 MODULE_LICENSE("GPL v2");