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                        .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 = 0x00,
 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 = 0x00,
 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 = false,
 460                .bootime = 2,
 461        },
 462};
 463
 464static 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
 485static 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
 534read_error:
 535        return err;
 536}
 537
 538static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();
 539
 540static struct attribute *st_press_attributes[] = {
 541        &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
 542        NULL,
 543};
 544
 545static const struct attribute_group st_press_attribute_group = {
 546        .attrs = st_press_attributes,
 547};
 548
 549static 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
 558static 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
 568int 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
 635st_press_device_register_error:
 636        if (irq > 0)
 637                st_sensors_deallocate_trigger(indio_dev);
 638st_press_probe_trigger_error:
 639        st_press_deallocate_ring(indio_dev);
 640st_press_power_off:
 641        st_sensors_power_disable(indio_dev);
 642
 643        return err;
 644}
 645EXPORT_SYMBOL(st_press_common_probe);
 646
 647void 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}
 659EXPORT_SYMBOL(st_press_common_remove);
 660
 661MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
 662MODULE_DESCRIPTION("STMicroelectronics pressures driver");
 663MODULE_LICENSE("GPL v2");
 664