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 /*
 116  * CUSTOM VALUES FOR LPS331AP SENSOR
 117  * See LPS331AP datasheet:
 118  * http://www2.st.com/resource/en/datasheet/lps331ap.pdf
 119  */
 120 #define ST_PRESS_LPS331AP_WAI_EXP               0xbb
 121 #define ST_PRESS_LPS331AP_ODR_ADDR              0x20
 122 #define ST_PRESS_LPS331AP_ODR_MASK              0x70
 123 #define ST_PRESS_LPS331AP_ODR_AVL_1HZ_VAL       0x01
 124 #define ST_PRESS_LPS331AP_ODR_AVL_7HZ_VAL       0x05
 125 #define ST_PRESS_LPS331AP_ODR_AVL_13HZ_VAL      0x06
 126 #define ST_PRESS_LPS331AP_ODR_AVL_25HZ_VAL      0x07
 127 #define ST_PRESS_LPS331AP_PW_ADDR               0x20
 128 #define ST_PRESS_LPS331AP_PW_MASK               0x80
 129 #define ST_PRESS_LPS331AP_FS_ADDR               0x23
 130 #define ST_PRESS_LPS331AP_FS_MASK               0x30
 131 #define ST_PRESS_LPS331AP_BDU_ADDR              0x20
 132 #define ST_PRESS_LPS331AP_BDU_MASK              0x04
 133 #define ST_PRESS_LPS331AP_DRDY_IRQ_ADDR         0x22
 134 #define ST_PRESS_LPS331AP_DRDY_IRQ_INT1_MASK    0x04
 135 #define ST_PRESS_LPS331AP_DRDY_IRQ_INT2_MASK    0x20
 136 #define ST_PRESS_LPS331AP_IHL_IRQ_ADDR          0x22
 137 #define ST_PRESS_LPS331AP_IHL_IRQ_MASK          0x80
 138 #define ST_PRESS_LPS331AP_OD_IRQ_ADDR           0x22
 139 #define ST_PRESS_LPS331AP_OD_IRQ_MASK           0x40
 140 #define ST_PRESS_LPS331AP_MULTIREAD_BIT         true
 141
 142 /*
 143  * CUSTOM VALUES FOR THE OBSOLETE LPS001WP SENSOR
 144  */
 145
 146 /* LPS001WP pressure resolution */
 147 #define ST_PRESS_LPS001WP_LSB_PER_MBAR          16UL
 148 /* LPS001WP temperature resolution */
 149 #define ST_PRESS_LPS001WP_LSB_PER_CELSIUS       64UL
 150
 151 #define ST_PRESS_LPS001WP_WAI_EXP               0xba
 152 #define ST_PRESS_LPS001WP_ODR_ADDR              0x20
 153 #define ST_PRESS_LPS001WP_ODR_MASK              0x30
 154 #define ST_PRESS_LPS001WP_ODR_AVL_1HZ_VAL       0x01
 155 #define ST_PRESS_LPS001WP_ODR_AVL_7HZ_VAL       0x02
 156 #define ST_PRESS_LPS001WP_ODR_AVL_13HZ_VAL      0x03
 157 #define ST_PRESS_LPS001WP_PW_ADDR               0x20
 158 #define ST_PRESS_LPS001WP_PW_MASK               0x40
 159 #define ST_PRESS_LPS001WP_FS_AVL_PRESS_GAIN \
 160         (100000000UL / ST_PRESS_LPS001WP_LSB_PER_MBAR)
 161 #define ST_PRESS_LPS001WP_BDU_ADDR              0x20
 162 #define ST_PRESS_LPS001WP_BDU_MASK              0x04
 163 #define ST_PRESS_LPS001WP_MULTIREAD_BIT         true
 164 #define ST_PRESS_LPS001WP_OUT_L_ADDR            0x28
 165 #define ST_TEMP_LPS001WP_OUT_L_ADDR             0x2a
 166
 167 /*
 168  * CUSTOM VALUES FOR LPS25H SENSOR
 169  * See LPS25H datasheet:
 170  * http://www2.st.com/resource/en/datasheet/lps25h.pdf
 171  */
 172 #define ST_PRESS_LPS25H_WAI_EXP                 0xbd
 173 #define ST_PRESS_LPS25H_ODR_ADDR                0x20
 174 #define ST_PRESS_LPS25H_ODR_MASK                0x70
 175 #define ST_PRESS_LPS25H_ODR_AVL_1HZ_VAL         0x01
 176 #define ST_PRESS_LPS25H_ODR_AVL_7HZ_VAL         0x02
 177 #define ST_PRESS_LPS25H_ODR_AVL_13HZ_VAL        0x03
 178 #define ST_PRESS_LPS25H_ODR_AVL_25HZ_VAL        0x04
 179 #define ST_PRESS_LPS25H_PW_ADDR                 0x20
 180 #define ST_PRESS_LPS25H_PW_MASK                 0x80
 181 #define ST_PRESS_LPS25H_BDU_ADDR                0x20
 182 #define ST_PRESS_LPS25H_BDU_MASK                0x04
 183 #define ST_PRESS_LPS25H_DRDY_IRQ_ADDR           0x23
 184 #define ST_PRESS_LPS25H_DRDY_IRQ_INT1_MASK      0x01
 185 #define ST_PRESS_LPS25H_DRDY_IRQ_INT2_MASK      0x10
 186 #define ST_PRESS_LPS25H_IHL_IRQ_ADDR            0x22
 187 #define ST_PRESS_LPS25H_IHL_IRQ_MASK            0x80
 188 #define ST_PRESS_LPS25H_OD_IRQ_ADDR             0x22
 189 #define ST_PRESS_LPS25H_OD_IRQ_MASK             0x40
 190 #define ST_PRESS_LPS25H_MULTIREAD_BIT           true
 191 #define ST_PRESS_LPS25H_OUT_XL_ADDR             0x28
 192 #define ST_TEMP_LPS25H_OUT_L_ADDR               0x2b
 193
 194 /*
 195  * CUSTOM VALUES FOR LPS22HB SENSOR
 196  * See LPS22HB datasheet:
 197  * http://www2.st.com/resource/en/datasheet/lps22hb.pdf
 198  */
 199
 200 /* LPS22HB temperature sensitivity */
 201 #define ST_PRESS_LPS22HB_LSB_PER_CELSIUS        100UL
 202
 203 #define ST_PRESS_LPS22HB_WAI_EXP                0xb1
 204 #define ST_PRESS_LPS22HB_ODR_ADDR               0x10
 205 #define ST_PRESS_LPS22HB_ODR_MASK               0x70
 206 #define ST_PRESS_LPS22HB_ODR_AVL_1HZ_VAL        0x01
 207 #define ST_PRESS_LPS22HB_ODR_AVL_10HZ_VAL       0x02
 208 #define ST_PRESS_LPS22HB_ODR_AVL_25HZ_VAL       0x03
 209 #define ST_PRESS_LPS22HB_ODR_AVL_50HZ_VAL       0x04
 210 #define ST_PRESS_LPS22HB_ODR_AVL_75HZ_VAL       0x05
 211 #define ST_PRESS_LPS22HB_PW_ADDR                0x10
 212 #define ST_PRESS_LPS22HB_PW_MASK                0x70
 213 #define ST_PRESS_LPS22HB_BDU_ADDR               0x10
 214 #define ST_PRESS_LPS22HB_BDU_MASK               0x02
 215 #define ST_PRESS_LPS22HB_DRDY_IRQ_ADDR          0x12
 216 #define ST_PRESS_LPS22HB_DRDY_IRQ_INT1_MASK     0x04
 217 #define ST_PRESS_LPS22HB_DRDY_IRQ_INT2_MASK     0x08
 218 #define ST_PRESS_LPS22HB_IHL_IRQ_ADDR           0x12
 219 #define ST_PRESS_LPS22HB_IHL_IRQ_MASK           0x80
 220 #define ST_PRESS_LPS22HB_OD_IRQ_ADDR            0x12
 221 #define ST_PRESS_LPS22HB_OD_IRQ_MASK            0x40
 222 #define ST_PRESS_LPS22HB_MULTIREAD_BIT          true
 223
 224 static const struct iio_chan_spec st_press_1_channels[] = {
 225         {
 226                 .type = IIO_PRESSURE,
 227                 .address = ST_PRESS_1_OUT_XL_ADDR,
 228                 .scan_index = 0,
 229                 .scan_type = {
 230                         .sign = 'u',
 231                         .realbits = 24,
 232                         .storagebits = 32,
 233                         .endianness = IIO_LE,
 234                 },
 235                 .info_mask_separate =
 236                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
 237         },
 238         {
 239                 .type = IIO_TEMP,
 240                 .address = ST_TEMP_1_OUT_L_ADDR,
 241                 .scan_index = 1,
 242                 .scan_type = {
 243                         .sign = 'u',
 244                         .realbits = 16,
 245                         .storagebits = 16,
 246                         .endianness = IIO_LE,
 247                 },
 248                 .info_mask_separate =
 249                         BIT(IIO_CHAN_INFO_RAW) |
 250                         BIT(IIO_CHAN_INFO_SCALE) |
 251                         BIT(IIO_CHAN_INFO_OFFSET),
 252         },
 253         IIO_CHAN_SOFT_TIMESTAMP(2)
 254 };
 255
 256 static const struct iio_chan_spec st_press_lps001wp_channels[] = {
 257         {
 258                 .type = IIO_PRESSURE,
 259                 .address = ST_PRESS_LPS001WP_OUT_L_ADDR,
 260                 .scan_index = 0,
 261                 .scan_type = {
 262                         .sign = 'u',
 263                         .realbits = 16,
 264                         .storagebits = 16,
 265                         .endianness = IIO_LE,
 266                 },
 267                 .info_mask_separate =
 268                         BIT(IIO_CHAN_INFO_RAW) |
 269                         BIT(IIO_CHAN_INFO_SCALE),
 270         },
 271         {
 272                 .type = IIO_TEMP,
 273                 .address = ST_TEMP_LPS001WP_OUT_L_ADDR,
 274                 .scan_index = 1,
 275                 .scan_type = {
 276                         .sign = 'u',
 277                         .realbits = 16,
 278                         .storagebits = 16,
 279                         .endianness = IIO_LE,
 280                 },
 281                 .info_mask_separate =
 282                         BIT(IIO_CHAN_INFO_RAW) |
 283                         BIT(IIO_CHAN_INFO_SCALE),
 284         },
 285         IIO_CHAN_SOFT_TIMESTAMP(2)
 286 };
 287
 288 static const struct iio_chan_spec st_press_lps22hb_channels[] = {
 289         {
 290                 .type = IIO_PRESSURE,
 291                 .address = ST_PRESS_1_OUT_XL_ADDR,
 292                 .scan_index = 0,
 293                 .scan_type = {
 294                         .sign = 'u',
 295                         .realbits = 24,
 296                         .storagebits = 32,
 297                         .endianness = IIO_LE,
 298                 },
 299                 .info_mask_separate =
 300                         BIT(IIO_CHAN_INFO_RAW) |
 301                         BIT(IIO_CHAN_INFO_SCALE),
 302                 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
 303         },
 304         {
 305                 .type = IIO_TEMP,
 306                 .address = ST_TEMP_1_OUT_L_ADDR,
 307                 .scan_index = 1,
 308                 .scan_type = {
 309                         .sign = 's',
 310                         .realbits = 16,
 311                         .storagebits = 16,
 312                         .endianness = IIO_LE,
 313                 },
 314                 .info_mask_separate =
 315                         BIT(IIO_CHAN_INFO_RAW) |
 316                         BIT(IIO_CHAN_INFO_SCALE),
 317                 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
 318         },
 319         IIO_CHAN_SOFT_TIMESTAMP(2)
 320 };
 321
 322 static const struct st_sensor_settings st_press_sensors_settings[] = {
 323         {
 324                 .wai = ST_PRESS_LPS331AP_WAI_EXP,
 325                 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
 326                 .sensors_supported = {
 327                         [0] = LPS331AP_PRESS_DEV_NAME,
 328                 },
 329                 .ch = (struct iio_chan_spec *)st_press_1_channels,
 330                 .num_ch = ARRAY_SIZE(st_press_1_channels),
 331                 .odr = {
 332                         .addr = ST_PRESS_LPS331AP_ODR_ADDR,
 333                         .mask = ST_PRESS_LPS331AP_ODR_MASK,
 334                         .odr_avl = {
 335                                 { 1, ST_PRESS_LPS331AP_ODR_AVL_1HZ_VAL, },
 336                                 { 7, ST_PRESS_LPS331AP_ODR_AVL_7HZ_VAL, },
 337                                 { 13, ST_PRESS_LPS331AP_ODR_AVL_13HZ_VAL, },
 338                                 { 25, ST_PRESS_LPS331AP_ODR_AVL_25HZ_VAL, },
 339                         },
 340                 },
 341                 .pw = {
 342                         .addr = ST_PRESS_LPS331AP_PW_ADDR,
 343                         .mask = ST_PRESS_LPS331AP_PW_MASK,
 344                         .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
 345                         .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
 346                 },
 347                 .fs = {
 348                         .addr = ST_PRESS_LPS331AP_FS_ADDR,
 349                         .mask = ST_PRESS_LPS331AP_FS_MASK,
 350                         .fs_avl = {
 351                                 /*
 352                                  * Pressure and temperature sensitivity values
 353                                  * as defined in table 3 of LPS331AP datasheet.
 354                                  */
 355                                 [0] = {
 356                                         .num = ST_PRESS_FS_AVL_1260MB,
 357                                         .gain = ST_PRESS_KPASCAL_NANO_SCALE,
 358                                         .gain2 = ST_PRESS_LSB_PER_CELSIUS,
 359                                 },
 360                         },
 361                 },
 362                 .bdu = {
 363                         .addr = ST_PRESS_LPS331AP_BDU_ADDR,
 364                         .mask = ST_PRESS_LPS331AP_BDU_MASK,
 365                 },
 366                 .drdy_irq = {
 367                         .addr = ST_PRESS_LPS331AP_DRDY_IRQ_ADDR,
 368                         .mask_int1 = ST_PRESS_LPS331AP_DRDY_IRQ_INT1_MASK,
 369                         .mask_int2 = ST_PRESS_LPS331AP_DRDY_IRQ_INT2_MASK,
 370                         .addr_ihl = ST_PRESS_LPS331AP_IHL_IRQ_ADDR,
 371                         .mask_ihl = ST_PRESS_LPS331AP_IHL_IRQ_MASK,
 372                         .addr_od = ST_PRESS_LPS331AP_OD_IRQ_ADDR,
 373                         .mask_od = ST_PRESS_LPS331AP_OD_IRQ_MASK,
 374                         .addr_stat_drdy = ST_SENSORS_DEFAULT_STAT_ADDR,
 375                 },
 376                 .multi_read_bit = ST_PRESS_LPS331AP_MULTIREAD_BIT,
 377                 .bootime = 2,
 378         },
 379         {
 380                 .wai = ST_PRESS_LPS001WP_WAI_EXP,
 381                 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
 382                 .sensors_supported = {
 383                         [0] = LPS001WP_PRESS_DEV_NAME,
 384                 },
 385                 .ch = (struct iio_chan_spec *)st_press_lps001wp_channels,
 386                 .num_ch = ARRAY_SIZE(st_press_lps001wp_channels),
 387                 .odr = {
 388                         .addr = ST_PRESS_LPS001WP_ODR_ADDR,
 389                         .mask = ST_PRESS_LPS001WP_ODR_MASK,
 390                         .odr_avl = {
 391                                 { 1, ST_PRESS_LPS001WP_ODR_AVL_1HZ_VAL, },
 392                                 { 7, ST_PRESS_LPS001WP_ODR_AVL_7HZ_VAL, },
 393                                 { 13, ST_PRESS_LPS001WP_ODR_AVL_13HZ_VAL, },
 394                         },
 395                 },
 396                 .pw = {
 397                         .addr = ST_PRESS_LPS001WP_PW_ADDR,
 398                         .mask = ST_PRESS_LPS001WP_PW_MASK,
 399                         .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
 400                         .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
 401                 },
 402                 .fs = {
 403                         .fs_avl = {
 404                                 /*
 405                                  * Pressure and temperature resolution values
 406                                  * as defined in table 3 of LPS001WP datasheet.
 407                                  */
 408                                 [0] = {
 409                                         .num = ST_PRESS_FS_AVL_1100MB,
 410                                         .gain = ST_PRESS_LPS001WP_FS_AVL_PRESS_GAIN,
 411                                         .gain2 = ST_PRESS_LPS001WP_LSB_PER_CELSIUS,
 412                                 },
 413                         },
 414                 },
 415                 .bdu = {
 416                         .addr = ST_PRESS_LPS001WP_BDU_ADDR,
 417                         .mask = ST_PRESS_LPS001WP_BDU_MASK,
 418                 },
 419                 .drdy_irq = {
 420                         .addr = 0,
 421                 },
 422                 .multi_read_bit = ST_PRESS_LPS001WP_MULTIREAD_BIT,
 423                 .bootime = 2,
 424         },
 425         {
 426                 .wai = ST_PRESS_LPS25H_WAI_EXP,
 427                 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
 428                 .sensors_supported = {
 429                         [0] = LPS25H_PRESS_DEV_NAME,
 430                 },
 431                 .ch = (struct iio_chan_spec *)st_press_1_channels,
 432                 .num_ch = ARRAY_SIZE(st_press_1_channels),
 433                 .odr = {
 434                         .addr = ST_PRESS_LPS25H_ODR_ADDR,
 435                         .mask = ST_PRESS_LPS25H_ODR_MASK,
 436                         .odr_avl = {
 437                                 { 1, ST_PRESS_LPS25H_ODR_AVL_1HZ_VAL, },
 438                                 { 7, ST_PRESS_LPS25H_ODR_AVL_7HZ_VAL, },
 439                                 { 13, ST_PRESS_LPS25H_ODR_AVL_13HZ_VAL, },
 440                                 { 25, ST_PRESS_LPS25H_ODR_AVL_25HZ_VAL, },
 441                         },
 442                 },
 443                 .pw = {
 444                         .addr = ST_PRESS_LPS25H_PW_ADDR,
 445                         .mask = ST_PRESS_LPS25H_PW_MASK,
 446                         .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
 447                         .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
 448                 },
 449                 .fs = {
 450                         .fs_avl = {
 451                                 /*
 452                                  * Pressure and temperature sensitivity values
 453                                  * as defined in table 3 of LPS25H datasheet.
 454                                  */
 455                                 [0] = {
 456                                         .num = ST_PRESS_FS_AVL_1260MB,
 457                                         .gain = ST_PRESS_KPASCAL_NANO_SCALE,
 458                                         .gain2 = ST_PRESS_LSB_PER_CELSIUS,
 459                                 },
 460                         },
 461                 },
 462                 .bdu = {
 463                         .addr = ST_PRESS_LPS25H_BDU_ADDR,
 464                         .mask = ST_PRESS_LPS25H_BDU_MASK,
 465                 },
 466                 .drdy_irq = {
 467                         .addr = ST_PRESS_LPS25H_DRDY_IRQ_ADDR,
 468                         .mask_int1 = ST_PRESS_LPS25H_DRDY_IRQ_INT1_MASK,
 469                         .mask_int2 = ST_PRESS_LPS25H_DRDY_IRQ_INT2_MASK,
 470                         .addr_ihl = ST_PRESS_LPS25H_IHL_IRQ_ADDR,
 471                         .mask_ihl = ST_PRESS_LPS25H_IHL_IRQ_MASK,
 472                         .addr_od = ST_PRESS_LPS25H_OD_IRQ_ADDR,
 473                         .mask_od = ST_PRESS_LPS25H_OD_IRQ_MASK,
 474                         .addr_stat_drdy = ST_SENSORS_DEFAULT_STAT_ADDR,
 475                 },
 476                 .multi_read_bit = ST_PRESS_LPS25H_MULTIREAD_BIT,
 477                 .bootime = 2,
 478         },
 479         {
 480                 .wai = ST_PRESS_LPS22HB_WAI_EXP,
 481                 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
 482                 .sensors_supported = {
 483                         [0] = LPS22HB_PRESS_DEV_NAME,
 484                 },
 485                 .ch = (struct iio_chan_spec *)st_press_lps22hb_channels,
 486                 .num_ch = ARRAY_SIZE(st_press_lps22hb_channels),
 487                 .odr = {
 488                         .addr = ST_PRESS_LPS22HB_ODR_ADDR,
 489                         .mask = ST_PRESS_LPS22HB_ODR_MASK,
 490                         .odr_avl = {
 491                                 { 1, ST_PRESS_LPS22HB_ODR_AVL_1HZ_VAL, },
 492                                 { 10, ST_PRESS_LPS22HB_ODR_AVL_10HZ_VAL, },
 493                                 { 25, ST_PRESS_LPS22HB_ODR_AVL_25HZ_VAL, },
 494                                 { 50, ST_PRESS_LPS22HB_ODR_AVL_50HZ_VAL, },
 495                                 { 75, ST_PRESS_LPS22HB_ODR_AVL_75HZ_VAL, },
 496                         },
 497                 },
 498                 .pw = {
 499                         .addr = ST_PRESS_LPS22HB_PW_ADDR,
 500                         .mask = ST_PRESS_LPS22HB_PW_MASK,
 501                         .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
 502                 },
 503                 .fs = {
 504                         .fs_avl = {
 505                                 /*
 506                                  * Pressure and temperature sensitivity values
 507                                  * as defined in table 3 of LPS22HB datasheet.
 508                                  */
 509                                 [0] = {
 510                                         .num = ST_PRESS_FS_AVL_1260MB,
 511                                         .gain = ST_PRESS_KPASCAL_NANO_SCALE,
 512                                         .gain2 = ST_PRESS_LPS22HB_LSB_PER_CELSIUS,
 513                                 },
 514                         },
 515                 },
 516                 .bdu = {
 517                         .addr = ST_PRESS_LPS22HB_BDU_ADDR,
 518                         .mask = ST_PRESS_LPS22HB_BDU_MASK,
 519                 },
 520                 .drdy_irq = {
 521                         .addr = ST_PRESS_LPS22HB_DRDY_IRQ_ADDR,
 522                         .mask_int1 = ST_PRESS_LPS22HB_DRDY_IRQ_INT1_MASK,
 523                         .mask_int2 = ST_PRESS_LPS22HB_DRDY_IRQ_INT2_MASK,
 524                         .addr_ihl = ST_PRESS_LPS22HB_IHL_IRQ_ADDR,
 525                         .mask_ihl = ST_PRESS_LPS22HB_IHL_IRQ_MASK,
 526                         .addr_od = ST_PRESS_LPS22HB_OD_IRQ_ADDR,
 527                         .mask_od = ST_PRESS_LPS22HB_OD_IRQ_MASK,
 528                         .addr_stat_drdy = ST_SENSORS_DEFAULT_STAT_ADDR,
 529                 },
 530                 .multi_read_bit = ST_PRESS_LPS22HB_MULTIREAD_BIT,
 531         },
 532 };
 533
 534 static int st_press_write_raw(struct iio_dev *indio_dev,
 535                               struct iio_chan_spec const *ch,
 536                               int val,
 537                               int val2,
 538                               long mask)
 539 {
 540         int err;
 541
 542         switch (mask) {
 543         case IIO_CHAN_INFO_SAMP_FREQ:
 544                 if (val2)
 545                         return -EINVAL;
 546                 mutex_lock(&indio_dev->mlock);
 547                 err = st_sensors_set_odr(indio_dev, val);
 548                 mutex_unlock(&indio_dev->mlock);
 549                 return err;
 550         default:
 551                 return -EINVAL;
 552         }
 553 }
 554
 555 static int st_press_read_raw(struct iio_dev *indio_dev,
 556                         struct iio_chan_spec const *ch, int *val,
 557                                                         int *val2, long mask)
 558 {
 559         int err;
 560         struct st_sensor_data *press_data = iio_priv(indio_dev);
 561
 562         switch (mask) {
 563         case IIO_CHAN_INFO_RAW:
 564                 err = st_sensors_read_info_raw(indio_dev, ch, val);
 565                 if (err < 0)
 566                         goto read_error;
 567
 568                 return IIO_VAL_INT;
 569         case IIO_CHAN_INFO_SCALE:
 570                 switch (ch->type) {
 571                 case IIO_PRESSURE:
 572                         *val = 0;
 573                         *val2 = press_data->current_fullscale->gain;
 574                         return IIO_VAL_INT_PLUS_NANO;
 575                 case IIO_TEMP:
 576                         *val = MCELSIUS_PER_CELSIUS;
 577                         *val2 = press_data->current_fullscale->gain2;
 578                         return IIO_VAL_FRACTIONAL;
 579                 default:
 580                         err = -EINVAL;
 581                         goto read_error;
 582                 }
 583
 584         case IIO_CHAN_INFO_OFFSET:
 585                 switch (ch->type) {
 586                 case IIO_TEMP:
 587                         *val = ST_PRESS_MILLI_CELSIUS_OFFSET *
 588                                press_data->current_fullscale->gain2;
 589                         *val2 = MCELSIUS_PER_CELSIUS;
 590                         break;
 591                 default:
 592                         err = -EINVAL;
 593                         goto read_error;
 594                 }
 595
 596                 return IIO_VAL_FRACTIONAL;
 597         case IIO_CHAN_INFO_SAMP_FREQ:
 598                 *val = press_data->odr;
 599                 return IIO_VAL_INT;
 600         default:
 601                 return -EINVAL;
 602         }
 603
 604 read_error:
 605         return err;
 606 }
 607
 608 static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();
 609
 610 static struct attribute *st_press_attributes[] = {
 611         &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
 612         NULL,
 613 };
 614
 615 static const struct attribute_group st_press_attribute_group = {
 616         .attrs = st_press_attributes,
 617 };
 618
 619 static const struct iio_info press_info = {
 620         .driver_module = THIS_MODULE,
 621         .attrs = &st_press_attribute_group,
 622         .read_raw = &st_press_read_raw,
 623         .write_raw = &st_press_write_raw,
 624         .debugfs_reg_access = &st_sensors_debugfs_reg_access,
 625 };
 626
 627 #ifdef CONFIG_IIO_TRIGGER
 628 static const struct iio_trigger_ops st_press_trigger_ops = {
 629         .owner = THIS_MODULE,
 630         .set_trigger_state = ST_PRESS_TRIGGER_SET_STATE,
 631         .validate_device = st_sensors_validate_device,
 632 };
 633 #define ST_PRESS_TRIGGER_OPS (&st_press_trigger_ops)
 634 #else
 635 #define ST_PRESS_TRIGGER_OPS NULL
 636 #endif
 637
 638 int st_press_common_probe(struct iio_dev *indio_dev)
 639 {
 640         struct st_sensor_data *press_data = iio_priv(indio_dev);
 641         int irq = press_data->get_irq_data_ready(indio_dev);
 642         int err;
 643
 644         indio_dev->modes = INDIO_DIRECT_MODE;
 645         indio_dev->info = &press_info;
 646         mutex_init(&press_data->tb.buf_lock);
 647
 648         err = st_sensors_power_enable(indio_dev);
 649         if (err)
 650                 return err;
 651
 652         err = st_sensors_check_device_support(indio_dev,
 653                                         ARRAY_SIZE(st_press_sensors_settings),
 654                                         st_press_sensors_settings);
 655         if (err < 0)
 656                 goto st_press_power_off;
 657
 658         /*
 659          * Skip timestamping channel while declaring available channels to
 660          * common st_sensor layer. Look at st_sensors_get_buffer_element() to
 661          * see how timestamps are explicitly pushed as last samples block
 662          * element.
 663          */
 664         press_data->num_data_channels = press_data->sensor_settings->num_ch - 1;
 665         press_data->multiread_bit = press_data->sensor_settings->multi_read_bit;
 666         indio_dev->channels = press_data->sensor_settings->ch;
 667         indio_dev->num_channels = press_data->sensor_settings->num_ch;
 668
 669         press_data->current_fullscale =
 670                 (struct st_sensor_fullscale_avl *)
 671                         &press_data->sensor_settings->fs.fs_avl[0];
 672
 673         press_data->odr = press_data->sensor_settings->odr.odr_avl[0].hz;
 674
 675         /* Some devices don't support a data ready pin. */
 676         if (!press_data->dev->platform_data &&
 677                                 press_data->sensor_settings->drdy_irq.addr)
 678                 press_data->dev->platform_data =
 679                         (struct st_sensors_platform_data *)&default_press_pdata;
 680
 681         err = st_sensors_init_sensor(indio_dev, press_data->dev->platform_data);
 682         if (err < 0)
 683                 goto st_press_power_off;
 684
 685         err = st_press_allocate_ring(indio_dev);
 686         if (err < 0)
 687                 goto st_press_power_off;
 688
 689         if (irq > 0) {
 690                 err = st_sensors_allocate_trigger(indio_dev,
 691                                                   ST_PRESS_TRIGGER_OPS);
 692                 if (err < 0)
 693                         goto st_press_probe_trigger_error;
 694         }
 695
 696         err = iio_device_register(indio_dev);
 697         if (err)
 698                 goto st_press_device_register_error;
 699
 700         dev_info(&indio_dev->dev, "registered pressure sensor %s\n",
 701                  indio_dev->name);
 702
 703         return err;
 704
 705 st_press_device_register_error:
 706         if (irq > 0)
 707                 st_sensors_deallocate_trigger(indio_dev);
 708 st_press_probe_trigger_error:
 709         st_press_deallocate_ring(indio_dev);
 710 st_press_power_off:
 711         st_sensors_power_disable(indio_dev);
 712
 713         return err;
 714 }
 715 EXPORT_SYMBOL(st_press_common_probe);
 716
 717 void st_press_common_remove(struct iio_dev *indio_dev)
 718 {
 719         struct st_sensor_data *press_data = iio_priv(indio_dev);
 720
 721         st_sensors_power_disable(indio_dev);
 722
 723         iio_device_unregister(indio_dev);
 724         if (press_data->get_irq_data_ready(indio_dev) > 0)
 725                 st_sensors_deallocate_trigger(indio_dev);
 726
 727         st_press_deallocate_ring(indio_dev);
 728 }
 729 EXPORT_SYMBOL(st_press_common_remove);
 730
 731 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
 732 MODULE_DESCRIPTION("STMicroelectronics pressures driver");
 733 MODULE_LICENSE("GPL v2");