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 #define MCELSIUS_PER_CELSIUS                    1000
  32
  33 /* Default pressure sensitivity */
  34 #define ST_PRESS_LSB_PER_MBAR                   4096UL
  35 #define ST_PRESS_KPASCAL_NANO_SCALE             (100000000UL / \
  36                                                  ST_PRESS_LSB_PER_MBAR)
  37
  38 /* Default temperature sensitivity */
  39 #define ST_PRESS_LSB_PER_CELSIUS                480UL
  40 #define ST_PRESS_MILLI_CELSIUS_OFFSET           42500UL
  41
  42 #define ST_PRESS_NUMBER_DATA_CHANNELS           1
  43
  44 /* FULLSCALE */
  45 #define ST_PRESS_FS_AVL_1100MB                  1100
  46 #define ST_PRESS_FS_AVL_1260MB                  1260
  47
  48 #define ST_PRESS_1_OUT_XL_ADDR                  0x28
  49 #define ST_TEMP_1_OUT_L_ADDR                    0x2b
  50
  51 /* CUSTOM VALUES FOR LPS331AP SENSOR */
  52 #define ST_PRESS_LPS331AP_WAI_EXP               0xbb
  53 #define ST_PRESS_LPS331AP_ODR_ADDR              0x20
  54 #define ST_PRESS_LPS331AP_ODR_MASK              0x70
  55 #define ST_PRESS_LPS331AP_ODR_AVL_1HZ_VAL       0x01
  56 #define ST_PRESS_LPS331AP_ODR_AVL_7HZ_VAL       0x05
  57 #define ST_PRESS_LPS331AP_ODR_AVL_13HZ_VAL      0x06
  58 #define ST_PRESS_LPS331AP_ODR_AVL_25HZ_VAL      0x07
  59 #define ST_PRESS_LPS331AP_PW_ADDR               0x20
  60 #define ST_PRESS_LPS331AP_PW_MASK               0x80
  61 #define ST_PRESS_LPS331AP_FS_ADDR               0x23
  62 #define ST_PRESS_LPS331AP_FS_MASK               0x30
  63 #define ST_PRESS_LPS331AP_BDU_ADDR              0x20
  64 #define ST_PRESS_LPS331AP_BDU_MASK              0x04
  65 #define ST_PRESS_LPS331AP_DRDY_IRQ_ADDR         0x22
  66 #define ST_PRESS_LPS331AP_DRDY_IRQ_INT1_MASK    0x04
  67 #define ST_PRESS_LPS331AP_DRDY_IRQ_INT2_MASK    0x20
  68 #define ST_PRESS_LPS331AP_IHL_IRQ_ADDR          0x22
  69 #define ST_PRESS_LPS331AP_IHL_IRQ_MASK          0x80
  70 #define ST_PRESS_LPS331AP_OD_IRQ_ADDR           0x22
  71 #define ST_PRESS_LPS331AP_OD_IRQ_MASK           0x40
  72 #define ST_PRESS_LPS331AP_MULTIREAD_BIT         true
  73
  74 /* CUSTOM VALUES FOR LPS001WP SENSOR */
  75
  76 /* LPS001WP pressure resolution */
  77 #define ST_PRESS_LPS001WP_LSB_PER_MBAR          16UL
  78 /* LPS001WP temperature resolution */
  79 #define ST_PRESS_LPS001WP_LSB_PER_CELSIUS       64UL
  80
  81 #define ST_PRESS_LPS001WP_WAI_EXP               0xba
  82 #define ST_PRESS_LPS001WP_ODR_ADDR              0x20
  83 #define ST_PRESS_LPS001WP_ODR_MASK              0x30
  84 #define ST_PRESS_LPS001WP_ODR_AVL_1HZ_VAL       0x01
  85 #define ST_PRESS_LPS001WP_ODR_AVL_7HZ_VAL       0x02
  86 #define ST_PRESS_LPS001WP_ODR_AVL_13HZ_VAL      0x03
  87 #define ST_PRESS_LPS001WP_PW_ADDR               0x20
  88 #define ST_PRESS_LPS001WP_PW_MASK               0x40
  89 #define ST_PRESS_LPS001WP_FS_AVL_PRESS_GAIN \
  90         (100000000UL / ST_PRESS_LPS001WP_LSB_PER_MBAR)
  91 #define ST_PRESS_LPS001WP_BDU_ADDR              0x20
  92 #define ST_PRESS_LPS001WP_BDU_MASK              0x04
  93 #define ST_PRESS_LPS001WP_MULTIREAD_BIT         true
  94 #define ST_PRESS_LPS001WP_OUT_L_ADDR            0x28
  95 #define ST_TEMP_LPS001WP_OUT_L_ADDR             0x2a
  96
  97 /* CUSTOM VALUES FOR LPS25H SENSOR */
  98 #define ST_PRESS_LPS25H_WAI_EXP                 0xbd
  99 #define ST_PRESS_LPS25H_ODR_ADDR                0x20
 100 #define ST_PRESS_LPS25H_ODR_MASK                0x70
 101 #define ST_PRESS_LPS25H_ODR_AVL_1HZ_VAL         0x01
 102 #define ST_PRESS_LPS25H_ODR_AVL_7HZ_VAL         0x02
 103 #define ST_PRESS_LPS25H_ODR_AVL_13HZ_VAL        0x03
 104 #define ST_PRESS_LPS25H_ODR_AVL_25HZ_VAL        0x04
 105 #define ST_PRESS_LPS25H_PW_ADDR                 0x20
 106 #define ST_PRESS_LPS25H_PW_MASK                 0x80
 107 #define ST_PRESS_LPS25H_BDU_ADDR                0x20
 108 #define ST_PRESS_LPS25H_BDU_MASK                0x04
 109 #define ST_PRESS_LPS25H_DRDY_IRQ_ADDR           0x23
 110 #define ST_PRESS_LPS25H_DRDY_IRQ_INT1_MASK      0x01
 111 #define ST_PRESS_LPS25H_DRDY_IRQ_INT2_MASK      0x10
 112 #define ST_PRESS_LPS25H_IHL_IRQ_ADDR            0x22
 113 #define ST_PRESS_LPS25H_IHL_IRQ_MASK            0x80
 114 #define ST_PRESS_LPS25H_OD_IRQ_ADDR             0x22
 115 #define ST_PRESS_LPS25H_OD_IRQ_MASK             0x40
 116 #define ST_PRESS_LPS25H_MULTIREAD_BIT           true
 117 #define ST_PRESS_LPS25H_OUT_XL_ADDR             0x28
 118 #define ST_TEMP_LPS25H_OUT_L_ADDR               0x2b
 119
 120 static const struct iio_chan_spec st_press_1_channels[] = {
 121         {
 122                 .type = IIO_PRESSURE,
 123                 .channel2 = IIO_NO_MOD,
 124                 .address = ST_PRESS_1_OUT_XL_ADDR,
 125                 .scan_index = ST_SENSORS_SCAN_X,
 126                 .scan_type = {
 127                         .sign = 'u',
 128                         .realbits = 24,
 129                         .storagebits = 24,
 130                         .endianness = IIO_LE,
 131                 },
 132                 .info_mask_separate =
 133                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
 134                 .modified = 0,
 135         },
 136         {
 137                 .type = IIO_TEMP,
 138                 .channel2 = IIO_NO_MOD,
 139                 .address = ST_TEMP_1_OUT_L_ADDR,
 140                 .scan_index = -1,
 141                 .scan_type = {
 142                         .sign = 'u',
 143                         .realbits = 16,
 144                         .storagebits = 16,
 145                         .endianness = IIO_LE,
 146                 },
 147                 .info_mask_separate =
 148                         BIT(IIO_CHAN_INFO_RAW) |
 149                         BIT(IIO_CHAN_INFO_SCALE) |
 150                         BIT(IIO_CHAN_INFO_OFFSET),
 151                 .modified = 0,
 152         },
 153         IIO_CHAN_SOFT_TIMESTAMP(1)
 154 };
 155
 156 static const struct iio_chan_spec st_press_lps001wp_channels[] = {
 157         {
 158                 .type = IIO_PRESSURE,
 159                 .channel2 = IIO_NO_MOD,
 160                 .address = ST_PRESS_LPS001WP_OUT_L_ADDR,
 161                 .scan_index = ST_SENSORS_SCAN_X,
 162                 .scan_type = {
 163                         .sign = 'u',
 164                         .realbits = 16,
 165                         .storagebits = 16,
 166                         .endianness = IIO_LE,
 167                 },
 168                 .info_mask_separate =
 169                         BIT(IIO_CHAN_INFO_RAW) |
 170                         BIT(IIO_CHAN_INFO_SCALE),
 171                 .modified = 0,
 172         },
 173         {
 174                 .type = IIO_TEMP,
 175                 .channel2 = IIO_NO_MOD,
 176                 .address = ST_TEMP_LPS001WP_OUT_L_ADDR,
 177                 .scan_index = -1,
 178                 .scan_type = {
 179                         .sign = 'u',
 180                         .realbits = 16,
 181                         .storagebits = 16,
 182                         .endianness = IIO_LE,
 183                 },
 184                 .info_mask_separate =
 185                         BIT(IIO_CHAN_INFO_RAW) |
 186                         BIT(IIO_CHAN_INFO_SCALE),
 187                 .modified = 0,
 188         },
 189         IIO_CHAN_SOFT_TIMESTAMP(1)
 190 };
 191
 192 static const struct st_sensor_settings st_press_sensors_settings[] = {
 193         {
 194                 .wai = ST_PRESS_LPS331AP_WAI_EXP,
 195                 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
 196                 .sensors_supported = {
 197                         [0] = LPS331AP_PRESS_DEV_NAME,
 198                 },
 199                 .ch = (struct iio_chan_spec *)st_press_1_channels,
 200                 .num_ch = ARRAY_SIZE(st_press_1_channels),
 201                 .odr = {
 202                         .addr = ST_PRESS_LPS331AP_ODR_ADDR,
 203                         .mask = ST_PRESS_LPS331AP_ODR_MASK,
 204                         .odr_avl = {
 205                                 { 1, ST_PRESS_LPS331AP_ODR_AVL_1HZ_VAL, },
 206                                 { 7, ST_PRESS_LPS331AP_ODR_AVL_7HZ_VAL, },
 207                                 { 13, ST_PRESS_LPS331AP_ODR_AVL_13HZ_VAL, },
 208                                 { 25, ST_PRESS_LPS331AP_ODR_AVL_25HZ_VAL, },
 209                         },
 210                 },
 211                 .pw = {
 212                         .addr = ST_PRESS_LPS331AP_PW_ADDR,
 213                         .mask = ST_PRESS_LPS331AP_PW_MASK,
 214                         .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
 215                         .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
 216                 },
 217                 .fs = {
 218                         .addr = ST_PRESS_LPS331AP_FS_ADDR,
 219                         .mask = ST_PRESS_LPS331AP_FS_MASK,
 220                         .fs_avl = {
 221                                 /*
 222                                  * Pressure and temperature sensitivity values
 223                                  * as defined in table 3 of LPS331AP datasheet.
 224                                  */
 225                                 [0] = {
 226                                         .num = ST_PRESS_FS_AVL_1260MB,
 227                                         .gain = ST_PRESS_KPASCAL_NANO_SCALE,
 228                                         .gain2 = ST_PRESS_LSB_PER_CELSIUS,
 229                                 },
 230                         },
 231                 },
 232                 .bdu = {
 233                         .addr = ST_PRESS_LPS331AP_BDU_ADDR,
 234                         .mask = ST_PRESS_LPS331AP_BDU_MASK,
 235                 },
 236                 .drdy_irq = {
 237                         .addr = ST_PRESS_LPS331AP_DRDY_IRQ_ADDR,
 238                         .mask_int1 = ST_PRESS_LPS331AP_DRDY_IRQ_INT1_MASK,
 239                         .mask_int2 = ST_PRESS_LPS331AP_DRDY_IRQ_INT2_MASK,
 240                         .addr_ihl = ST_PRESS_LPS331AP_IHL_IRQ_ADDR,
 241                         .mask_ihl = ST_PRESS_LPS331AP_IHL_IRQ_MASK,
 242                         .addr_od = ST_PRESS_LPS331AP_OD_IRQ_ADDR,
 243                         .mask_od = ST_PRESS_LPS331AP_OD_IRQ_MASK,
 244                         .addr_stat_drdy = ST_SENSORS_DEFAULT_STAT_ADDR,
 245                 },
 246                 .multi_read_bit = ST_PRESS_LPS331AP_MULTIREAD_BIT,
 247                 .bootime = 2,
 248         },
 249         {
 250                 .wai = ST_PRESS_LPS001WP_WAI_EXP,
 251                 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
 252                 .sensors_supported = {
 253                         [0] = LPS001WP_PRESS_DEV_NAME,
 254                 },
 255                 .ch = (struct iio_chan_spec *)st_press_lps001wp_channels,
 256                 .num_ch = ARRAY_SIZE(st_press_lps001wp_channels),
 257                 .odr = {
 258                         .addr = ST_PRESS_LPS001WP_ODR_ADDR,
 259                         .mask = ST_PRESS_LPS001WP_ODR_MASK,
 260                         .odr_avl = {
 261                                 { 1, ST_PRESS_LPS001WP_ODR_AVL_1HZ_VAL, },
 262                                 { 7, ST_PRESS_LPS001WP_ODR_AVL_7HZ_VAL, },
 263                                 { 13, ST_PRESS_LPS001WP_ODR_AVL_13HZ_VAL, },
 264                         },
 265                 },
 266                 .pw = {
 267                         .addr = ST_PRESS_LPS001WP_PW_ADDR,
 268                         .mask = ST_PRESS_LPS001WP_PW_MASK,
 269                         .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
 270                         .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
 271                 },
 272                 .fs = {
 273                         .fs_avl = {
 274                                 /*
 275                                  * Pressure and temperature resolution values
 276                                  * as defined in table 3 of LPS001WP datasheet.
 277                                  */
 278                                 [0] = {
 279                                         .num = ST_PRESS_FS_AVL_1100MB,
 280                                         .gain = ST_PRESS_LPS001WP_FS_AVL_PRESS_GAIN,
 281                                         .gain2 = ST_PRESS_LPS001WP_LSB_PER_CELSIUS,
 282                                 },
 283                         },
 284                 },
 285                 .bdu = {
 286                         .addr = ST_PRESS_LPS001WP_BDU_ADDR,
 287                         .mask = ST_PRESS_LPS001WP_BDU_MASK,
 288                 },
 289                 .drdy_irq = {
 290                         .addr = 0,
 291                 },
 292                 .multi_read_bit = ST_PRESS_LPS001WP_MULTIREAD_BIT,
 293                 .bootime = 2,
 294         },
 295         {
 296                 .wai = ST_PRESS_LPS25H_WAI_EXP,
 297                 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
 298                 .sensors_supported = {
 299                         [0] = LPS25H_PRESS_DEV_NAME,
 300                 },
 301                 .ch = (struct iio_chan_spec *)st_press_1_channels,
 302                 .num_ch = ARRAY_SIZE(st_press_1_channels),
 303                 .odr = {
 304                         .addr = ST_PRESS_LPS25H_ODR_ADDR,
 305                         .mask = ST_PRESS_LPS25H_ODR_MASK,
 306                         .odr_avl = {
 307                                 { 1, ST_PRESS_LPS25H_ODR_AVL_1HZ_VAL, },
 308                                 { 7, ST_PRESS_LPS25H_ODR_AVL_7HZ_VAL, },
 309                                 { 13, ST_PRESS_LPS25H_ODR_AVL_13HZ_VAL, },
 310                                 { 25, ST_PRESS_LPS25H_ODR_AVL_25HZ_VAL, },
 311                         },
 312                 },
 313                 .pw = {
 314                         .addr = ST_PRESS_LPS25H_PW_ADDR,
 315                         .mask = ST_PRESS_LPS25H_PW_MASK,
 316                         .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
 317                         .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
 318                 },
 319                 .fs = {
 320                         .fs_avl = {
 321                                 /*
 322                                  * Pressure and temperature sensitivity values
 323                                  * as defined in table 3 of LPS25H datasheet.
 324                                  */
 325                                 [0] = {
 326                                         .num = ST_PRESS_FS_AVL_1260MB,
 327                                         .gain = ST_PRESS_KPASCAL_NANO_SCALE,
 328                                         .gain2 = ST_PRESS_LSB_PER_CELSIUS,
 329                                 },
 330                         },
 331                 },
 332                 .bdu = {
 333                         .addr = ST_PRESS_LPS25H_BDU_ADDR,
 334                         .mask = ST_PRESS_LPS25H_BDU_MASK,
 335                 },
 336                 .drdy_irq = {
 337                         .addr = ST_PRESS_LPS25H_DRDY_IRQ_ADDR,
 338                         .mask_int1 = ST_PRESS_LPS25H_DRDY_IRQ_INT1_MASK,
 339                         .mask_int2 = ST_PRESS_LPS25H_DRDY_IRQ_INT2_MASK,
 340                         .addr_ihl = ST_PRESS_LPS25H_IHL_IRQ_ADDR,
 341                         .mask_ihl = ST_PRESS_LPS25H_IHL_IRQ_MASK,
 342                         .addr_od = ST_PRESS_LPS25H_OD_IRQ_ADDR,
 343                         .mask_od = ST_PRESS_LPS25H_OD_IRQ_MASK,
 344                         .addr_stat_drdy = ST_SENSORS_DEFAULT_STAT_ADDR,
 345                 },
 346                 .multi_read_bit = ST_PRESS_LPS25H_MULTIREAD_BIT,
 347                 .bootime = 2,
 348         },
 349 };
 350
 351 static int st_press_write_raw(struct iio_dev *indio_dev,
 352                               struct iio_chan_spec const *ch,
 353                               int val,
 354                               int val2,
 355                               long mask)
 356 {
 357         int err;
 358
 359         switch (mask) {
 360         case IIO_CHAN_INFO_SAMP_FREQ:
 361                 if (val2)
 362                         return -EINVAL;
 363                 mutex_lock(&indio_dev->mlock);
 364                 err = st_sensors_set_odr(indio_dev, val);
 365                 mutex_unlock(&indio_dev->mlock);
 366                 return err;
 367         default:
 368                 return -EINVAL;
 369         }
 370 }
 371
 372 static int st_press_read_raw(struct iio_dev *indio_dev,
 373                         struct iio_chan_spec const *ch, int *val,
 374                                                         int *val2, long mask)
 375 {
 376         int err;
 377         struct st_sensor_data *press_data = iio_priv(indio_dev);
 378
 379         switch (mask) {
 380         case IIO_CHAN_INFO_RAW:
 381                 err = st_sensors_read_info_raw(indio_dev, ch, val);
 382                 if (err < 0)
 383                         goto read_error;
 384
 385                 return IIO_VAL_INT;
 386         case IIO_CHAN_INFO_SCALE:
 387                 switch (ch->type) {
 388                 case IIO_PRESSURE:
 389                         *val = 0;
 390                         *val2 = press_data->current_fullscale->gain;
 391                         return IIO_VAL_INT_PLUS_NANO;
 392                 case IIO_TEMP:
 393                         *val = MCELSIUS_PER_CELSIUS;
 394                         *val2 = press_data->current_fullscale->gain2;
 395                         return IIO_VAL_FRACTIONAL;
 396                 default:
 397                         err = -EINVAL;
 398                         goto read_error;
 399                 }
 400
 401         case IIO_CHAN_INFO_OFFSET:
 402                 switch (ch->type) {
 403                 case IIO_TEMP:
 404                         *val = ST_PRESS_MILLI_CELSIUS_OFFSET *
 405                                press_data->current_fullscale->gain2;
 406                         *val2 = MCELSIUS_PER_CELSIUS;
 407                         break;
 408                 default:
 409                         err = -EINVAL;
 410                         goto read_error;
 411                 }
 412
 413                 return IIO_VAL_FRACTIONAL;
 414         case IIO_CHAN_INFO_SAMP_FREQ:
 415                 *val = press_data->odr;
 416                 return IIO_VAL_INT;
 417         default:
 418                 return -EINVAL;
 419         }
 420
 421 read_error:
 422         return err;
 423 }
 424
 425 static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();
 426
 427 static struct attribute *st_press_attributes[] = {
 428         &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
 429         NULL,
 430 };
 431
 432 static const struct attribute_group st_press_attribute_group = {
 433         .attrs = st_press_attributes,
 434 };
 435
 436 static const struct iio_info press_info = {
 437         .driver_module = THIS_MODULE,
 438         .attrs = &st_press_attribute_group,
 439         .read_raw = &st_press_read_raw,
 440         .write_raw = &st_press_write_raw,
 441         .debugfs_reg_access = &st_sensors_debugfs_reg_access,
 442 };
 443
 444 #ifdef CONFIG_IIO_TRIGGER
 445 static const struct iio_trigger_ops st_press_trigger_ops = {
 446         .owner = THIS_MODULE,
 447         .set_trigger_state = ST_PRESS_TRIGGER_SET_STATE,
 448         .validate_device = st_sensors_validate_device,
 449 };
 450 #define ST_PRESS_TRIGGER_OPS (&st_press_trigger_ops)
 451 #else
 452 #define ST_PRESS_TRIGGER_OPS NULL
 453 #endif
 454
 455 int st_press_common_probe(struct iio_dev *indio_dev)
 456 {
 457         struct st_sensor_data *press_data = iio_priv(indio_dev);
 458         int irq = press_data->get_irq_data_ready(indio_dev);
 459         int err;
 460
 461         indio_dev->modes = INDIO_DIRECT_MODE;
 462         indio_dev->info = &press_info;
 463         mutex_init(&press_data->tb.buf_lock);
 464
 465         st_sensors_power_enable(indio_dev);
 466
 467         err = st_sensors_check_device_support(indio_dev,
 468                                         ARRAY_SIZE(st_press_sensors_settings),
 469                                         st_press_sensors_settings);
 470         if (err < 0)
 471                 return err;
 472
 473         press_data->num_data_channels = ST_PRESS_NUMBER_DATA_CHANNELS;
 474         press_data->multiread_bit = press_data->sensor_settings->multi_read_bit;
 475         indio_dev->channels = press_data->sensor_settings->ch;
 476         indio_dev->num_channels = press_data->sensor_settings->num_ch;
 477
 478         if (press_data->sensor_settings->fs.addr != 0)
 479                 press_data->current_fullscale =
 480                         (struct st_sensor_fullscale_avl *)
 481                                 &press_data->sensor_settings->fs.fs_avl[0];
 482
 483         press_data->odr = press_data->sensor_settings->odr.odr_avl[0].hz;
 484
 485         /* Some devices don't support a data ready pin. */
 486         if (!press_data->dev->platform_data &&
 487                                 press_data->sensor_settings->drdy_irq.addr)
 488                 press_data->dev->platform_data =
 489                         (struct st_sensors_platform_data *)&default_press_pdata;
 490
 491         err = st_sensors_init_sensor(indio_dev, press_data->dev->platform_data);
 492         if (err < 0)
 493                 return err;
 494
 495         err = st_press_allocate_ring(indio_dev);
 496         if (err < 0)
 497                 return err;
 498
 499         if (irq > 0) {
 500                 err = st_sensors_allocate_trigger(indio_dev,
 501                                                   ST_PRESS_TRIGGER_OPS);
 502                 if (err < 0)
 503                         goto st_press_probe_trigger_error;
 504         }
 505
 506         err = iio_device_register(indio_dev);
 507         if (err)
 508                 goto st_press_device_register_error;
 509
 510         dev_info(&indio_dev->dev, "registered pressure sensor %s\n",
 511                  indio_dev->name);
 512
 513         return err;
 514
 515 st_press_device_register_error:
 516         if (irq > 0)
 517                 st_sensors_deallocate_trigger(indio_dev);
 518 st_press_probe_trigger_error:
 519         st_press_deallocate_ring(indio_dev);
 520
 521         return err;
 522 }
 523 EXPORT_SYMBOL(st_press_common_probe);
 524
 525 void st_press_common_remove(struct iio_dev *indio_dev)
 526 {
 527         struct st_sensor_data *press_data = iio_priv(indio_dev);
 528
 529         st_sensors_power_disable(indio_dev);
 530
 531         iio_device_unregister(indio_dev);
 532         if (press_data->get_irq_data_ready(indio_dev) > 0)
 533                 st_sensors_deallocate_trigger(indio_dev);
 534
 535         st_press_deallocate_ring(indio_dev);
 536 }
 537 EXPORT_SYMBOL(st_press_common_remove);
 538
 539 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
 540 MODULE_DESCRIPTION("STMicroelectronics pressures driver");
 541 MODULE_LICENSE("GPL v2");