LXR linux/drivers/iio/pressure/st_pressure

   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
 133static 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
 167static 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
 199static 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
 233static 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                        .int1 = {
 284                                .addr = 0x22,
 285                                .mask = 0x04,
 286                                .addr_od = 0x22,
 287                                .mask_od = 0x40,
 288                        },
 289                        .int2 = {
 290                                .addr = 0x22,
 291                                .mask = 0x20,
 292                                .addr_od = 0x22,
 293                                .mask_od = 0x40,
 294                        },
 295                        .addr_ihl = 0x22,
 296                        .mask_ihl = 0x80,
 297                        .stat_drdy = {
 298                                .addr = ST_SENSORS_DEFAULT_STAT_ADDR,
 299                                .mask = 0x03,
 300                        },
 301                },
 302                .sim = {
 303                        .addr = 0x20,
 304                        .value = BIT(0),
 305                },
 306                .multi_read_bit = true,
 307                .bootime = 2,
 308        },
 309        {
 310                /*
 311                 * CUSTOM VALUES FOR LPS001WP SENSOR
 312                 */
 313                .wai = 0xba,
 314                .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
 315                .sensors_supported = {
 316                        [0] = LPS001WP_PRESS_DEV_NAME,
 317                },
 318                .ch = (struct iio_chan_spec *)st_press_lps001wp_channels,
 319                .num_ch = ARRAY_SIZE(st_press_lps001wp_channels),
 320                .odr = {
 321                        .addr = 0x20,
 322                        .mask = 0x30,
 323                        .odr_avl = {
 324                                { .hz = 1, .value = 0x01 },
 325                                { .hz = 7, .value = 0x02 },
 326                                { .hz = 13, .value = 0x03 },
 327                        },
 328                },
 329                .pw = {
 330                        .addr = 0x20,
 331                        .mask = 0x40,
 332                        .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
 333                        .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
 334                },
 335                .fs = {
 336                        .fs_avl = {
 337                                /*
 338                                 * Pressure and temperature resolution values
 339                                 * as defined in table 3 of LPS001WP datasheet.
 340                                 */
 341                                [0] = {
 342                                        .num = ST_PRESS_FS_AVL_1100MB,
 343                                        .gain = ST_PRESS_LPS001WP_FS_AVL_PRESS_GAIN,
 344                                        .gain2 = ST_PRESS_LPS001WP_LSB_PER_CELSIUS,
 345                                },
 346                        },
 347                },
 348                .bdu = {
 349                        .addr = 0x20,
 350                        .mask = 0x04,
 351                },
 352                .sim = {
 353                        .addr = 0x20,
 354                        .value = BIT(0),
 355                },
 356                .multi_read_bit = true,
 357                .bootime = 2,
 358        },
 359        {
 360                /*
 361                 * CUSTOM VALUES FOR LPS25H SENSOR
 362                 * See LPS25H datasheet:
 363                 * http://www2.st.com/resource/en/datasheet/lps25h.pdf
 364                 */
 365                .wai = 0xbd,
 366                .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
 367                .sensors_supported = {
 368                        [0] = LPS25H_PRESS_DEV_NAME,
 369                },
 370                .ch = (struct iio_chan_spec *)st_press_1_channels,
 371                .num_ch = ARRAY_SIZE(st_press_1_channels),
 372                .odr = {
 373                        .addr = 0x20,
 374                        .mask = 0x70,
 375                        .odr_avl = {
 376                                { .hz = 1, .value = 0x01 },
 377                                { .hz = 7, .value = 0x02 },
 378                                { .hz = 13, .value = 0x03 },
 379                                { .hz = 25, .value = 0x04 },
 380                        },
 381                },
 382                .pw = {
 383                        .addr = 0x20,
 384                        .mask = 0x80,
 385                        .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
 386                        .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
 387                },
 388                .fs = {
 389                        .fs_avl = {
 390                                /*
 391                                 * Pressure and temperature sensitivity values
 392                                 * as defined in table 3 of LPS25H datasheet.
 393                                 */
 394                                [0] = {
 395                                        .num = ST_PRESS_FS_AVL_1260MB,
 396                                        .gain = ST_PRESS_KPASCAL_NANO_SCALE,
 397                                        .gain2 = ST_PRESS_LSB_PER_CELSIUS,
 398                                },
 399                        },
 400                },
 401                .bdu = {
 402                        .addr = 0x20,
 403                        .mask = 0x04,
 404                },
 405                .drdy_irq = {
 406                        .int1 = {
 407                                .addr = 0x23,
 408                                .mask = 0x01,
 409                                .addr_od = 0x22,
 410                                .mask_od = 0x40,
 411                        },
 412                        .addr_ihl = 0x22,
 413                        .mask_ihl = 0x80,
 414                        .stat_drdy = {
 415                                .addr = ST_SENSORS_DEFAULT_STAT_ADDR,
 416                                .mask = 0x03,
 417                        },
 418                },
 419                .sim = {
 420                        .addr = 0x20,
 421                        .value = BIT(0),
 422                },
 423                .multi_read_bit = true,
 424                .bootime = 2,
 425        },
 426        {
 427                /*
 428                 * CUSTOM VALUES FOR LPS22HB SENSOR
 429                 * See LPS22HB datasheet:
 430                 * http://www2.st.com/resource/en/datasheet/lps22hb.pdf
 431                 */
 432                .wai = 0xb1,
 433                .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
 434                .sensors_supported = {
 435                        [0] = LPS22HB_PRESS_DEV_NAME,
 436                        [1] = LPS33HW_PRESS_DEV_NAME,
 437                        [2] = LPS35HW_PRESS_DEV_NAME,
 438                },
 439                .ch = (struct iio_chan_spec *)st_press_lps22hb_channels,
 440                .num_ch = ARRAY_SIZE(st_press_lps22hb_channels),
 441                .odr = {
 442                        .addr = 0x10,
 443                        .mask = 0x70,
 444                        .odr_avl = {
 445                                { .hz = 1, .value = 0x01 },
 446                                { .hz = 10, .value = 0x02 },
 447                                { .hz = 25, .value = 0x03 },
 448                                { .hz = 50, .value = 0x04 },
 449                                { .hz = 75, .value = 0x05 },
 450                        },
 451                },
 452                .pw = {
 453                        .addr = 0x10,
 454                        .mask = 0x70,
 455                        .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
 456                },
 457                .fs = {
 458                        .fs_avl = {
 459                                /*
 460                                 * Pressure and temperature sensitivity values
 461                                 * as defined in table 3 of LPS22HB datasheet.
 462                                 */
 463                                [0] = {
 464                                        .num = ST_PRESS_FS_AVL_1260MB,
 465                                        .gain = ST_PRESS_KPASCAL_NANO_SCALE,
 466                                        .gain2 = ST_PRESS_LPS22HB_LSB_PER_CELSIUS,
 467                                },
 468                        },
 469                },
 470                .bdu = {
 471                        .addr = 0x10,
 472                        .mask = 0x02,
 473                },
 474                .drdy_irq = {
 475                        .int1 = {
 476                                .addr = 0x12,
 477                                .mask = 0x04,
 478                                .addr_od = 0x12,
 479                                .mask_od = 0x40,
 480                        },
 481                        .addr_ihl = 0x12,
 482                        .mask_ihl = 0x80,
 483                        .stat_drdy = {
 484                                .addr = ST_SENSORS_DEFAULT_STAT_ADDR,
 485                                .mask = 0x03,
 486                        },
 487                },
 488                .sim = {
 489                        .addr = 0x10,
 490                        .value = BIT(0),
 491                },
 492                .multi_read_bit = false,
 493                .bootime = 2,
 494        },
 495};
 496
 497static int st_press_write_raw(struct iio_dev *indio_dev,
 498                              struct iio_chan_spec const *ch,
 499                              int val,
 500                              int val2,
 501                              long mask)
 502{
 503        int err;
 504
 505        switch (mask) {
 506        case IIO_CHAN_INFO_SAMP_FREQ:
 507                if (val2)
 508                        return -EINVAL;
 509                mutex_lock(&indio_dev->mlock);
 510                err = st_sensors_set_odr(indio_dev, val);
 511                mutex_unlock(&indio_dev->mlock);
 512                return err;
 513        default:
 514                return -EINVAL;
 515        }
 516}
 517
 518static int st_press_read_raw(struct iio_dev *indio_dev,
 519                        struct iio_chan_spec const *ch, int *val,
 520                                                        int *val2, long mask)
 521{
 522        int err;
 523        struct st_sensor_data *press_data = iio_priv(indio_dev);
 524
 525        switch (mask) {
 526        case IIO_CHAN_INFO_RAW:
 527                err = st_sensors_read_info_raw(indio_dev, ch, val);
 528                if (err < 0)
 529                        goto read_error;
 530
 531                return IIO_VAL_INT;
 532        case IIO_CHAN_INFO_SCALE:
 533                switch (ch->type) {
 534                case IIO_PRESSURE:
 535                        *val = 0;
 536                        *val2 = press_data->current_fullscale->gain;
 537                        return IIO_VAL_INT_PLUS_NANO;
 538                case IIO_TEMP:
 539                        *val = MCELSIUS_PER_CELSIUS;
 540                        *val2 = press_data->current_fullscale->gain2;
 541                        return IIO_VAL_FRACTIONAL;
 542                default:
 543                        err = -EINVAL;
 544                        goto read_error;
 545                }
 546
 547        case IIO_CHAN_INFO_OFFSET:
 548                switch (ch->type) {
 549                case IIO_TEMP:
 550                        *val = ST_PRESS_MILLI_CELSIUS_OFFSET *
 551                               press_data->current_fullscale->gain2;
 552                        *val2 = MCELSIUS_PER_CELSIUS;
 553                        break;
 554                default:
 555                        err = -EINVAL;
 556                        goto read_error;
 557                }
 558
 559                return IIO_VAL_FRACTIONAL;
 560        case IIO_CHAN_INFO_SAMP_FREQ:
 561                *val = press_data->odr;
 562                return IIO_VAL_INT;
 563        default:
 564                return -EINVAL;
 565        }
 566
 567read_error:
 568        return err;
 569}
 570
 571static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();
 572
 573static struct attribute *st_press_attributes[] = {
 574        &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
 575        NULL,
 576};
 577
 578static const struct attribute_group st_press_attribute_group = {
 579        .attrs = st_press_attributes,
 580};
 581
 582static const struct iio_info press_info = {
 583        .attrs = &st_press_attribute_group,
 584        .read_raw = &st_press_read_raw,
 585        .write_raw = &st_press_write_raw,
 586        .debugfs_reg_access = &st_sensors_debugfs_reg_access,
 587};
 588
 589#ifdef CONFIG_IIO_TRIGGER
 590static const struct iio_trigger_ops st_press_trigger_ops = {
 591        .set_trigger_state = ST_PRESS_TRIGGER_SET_STATE,
 592        .validate_device = st_sensors_validate_device,
 593};
 594#define ST_PRESS_TRIGGER_OPS (&st_press_trigger_ops)
 595#else
 596#define ST_PRESS_TRIGGER_OPS NULL
 597#endif
 598
 599int st_press_common_probe(struct iio_dev *indio_dev)
 600{
 601        struct st_sensor_data *press_data = iio_priv(indio_dev);
 602        struct st_sensors_platform_data *pdata =
 603                (struct st_sensors_platform_data *)press_data->dev->platform_data;
 604        int irq = press_data->get_irq_data_ready(indio_dev);
 605        int err;
 606
 607        indio_dev->modes = INDIO_DIRECT_MODE;
 608        indio_dev->info = &press_info;
 609        mutex_init(&press_data->tb.buf_lock);
 610
 611        err = st_sensors_power_enable(indio_dev);
 612        if (err)
 613                return err;
 614
 615        err = st_sensors_check_device_support(indio_dev,
 616                                        ARRAY_SIZE(st_press_sensors_settings),
 617                                        st_press_sensors_settings);
 618        if (err < 0)
 619                goto st_press_power_off;
 620
 621        /*
 622         * Skip timestamping channel while declaring available channels to
 623         * common st_sensor layer. Look at st_sensors_get_buffer_element() to
 624         * see how timestamps are explicitly pushed as last samples block
 625         * element.
 626         */
 627        press_data->num_data_channels = press_data->sensor_settings->num_ch - 1;
 628        press_data->multiread_bit = press_data->sensor_settings->multi_read_bit;
 629        indio_dev->channels = press_data->sensor_settings->ch;
 630        indio_dev->num_channels = press_data->sensor_settings->num_ch;
 631
 632        press_data->current_fullscale =
 633                (struct st_sensor_fullscale_avl *)
 634                        &press_data->sensor_settings->fs.fs_avl[0];
 635
 636        press_data->odr = press_data->sensor_settings->odr.odr_avl[0].hz;
 637
 638        /* Some devices don't support a data ready pin. */
 639        if (!pdata && (press_data->sensor_settings->drdy_irq.int1.addr ||
 640                       press_data->sensor_settings->drdy_irq.int2.addr))
 641                pdata = (struct st_sensors_platform_data *)&default_press_pdata;
 642
 643        err = st_sensors_init_sensor(indio_dev, pdata);
 644        if (err < 0)
 645                goto st_press_power_off;
 646
 647        err = st_press_allocate_ring(indio_dev);
 648        if (err < 0)
 649                goto st_press_power_off;
 650
 651        if (irq > 0) {
 652                err = st_sensors_allocate_trigger(indio_dev,
 653                                                  ST_PRESS_TRIGGER_OPS);
 654                if (err < 0)
 655                        goto st_press_probe_trigger_error;
 656        }
 657
 658        err = iio_device_register(indio_dev);
 659        if (err)
 660                goto st_press_device_register_error;
 661
 662        dev_info(&indio_dev->dev, "registered pressure sensor %s\n",
 663                 indio_dev->name);
 664
 665        return err;
 666
 667st_press_device_register_error:
 668        if (irq > 0)
 669                st_sensors_deallocate_trigger(indio_dev);
 670st_press_probe_trigger_error:
 671        st_press_deallocate_ring(indio_dev);
 672st_press_power_off:
 673        st_sensors_power_disable(indio_dev);
 674
 675        return err;
 676}
 677EXPORT_SYMBOL(st_press_common_probe);
 678
 679void st_press_common_remove(struct iio_dev *indio_dev)
 680{
 681        struct st_sensor_data *press_data = iio_priv(indio_dev);
 682
 683        st_sensors_power_disable(indio_dev);
 684
 685        iio_device_unregister(indio_dev);
 686        if (press_data->get_irq_data_ready(indio_dev) > 0)
 687                st_sensors_deallocate_trigger(indio_dev);
 688
 689        st_press_deallocate_ring(indio_dev);
 690}
 691EXPORT_SYMBOL(st_press_common_remove);
 692
 693MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
 694MODULE_DESCRIPTION("STMicroelectronics pressures driver");
 695MODULE_LICENSE("GPL v2");
 696