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 ST_PRESS_LSB_PER_MBAR                   4096UL
  32 #define ST_PRESS_KPASCAL_NANO_SCALE             (100000000UL / \
  33                                                  ST_PRESS_LSB_PER_MBAR)
  34 #define ST_PRESS_LSB_PER_CELSIUS                480UL
  35 #define ST_PRESS_CELSIUS_NANO_SCALE             (1000000000UL / \
  36                                                  ST_PRESS_LSB_PER_CELSIUS)
  37 #define ST_PRESS_NUMBER_DATA_CHANNELS           1
  38
  39 /* FULLSCALE */
  40 #define ST_PRESS_FS_AVL_1260MB                  1260
  41
  42 #define ST_PRESS_1_OUT_XL_ADDR                  0x28
  43 #define ST_TEMP_1_OUT_L_ADDR                    0x2b
  44
  45 /* CUSTOM VALUES FOR LPS331AP SENSOR */
  46 #define ST_PRESS_LPS331AP_WAI_EXP               0xbb
  47 #define ST_PRESS_LPS331AP_ODR_ADDR              0x20
  48 #define ST_PRESS_LPS331AP_ODR_MASK              0x70
  49 #define ST_PRESS_LPS331AP_ODR_AVL_1HZ_VAL       0x01
  50 #define ST_PRESS_LPS331AP_ODR_AVL_7HZ_VAL       0x05
  51 #define ST_PRESS_LPS331AP_ODR_AVL_13HZ_VAL      0x06
  52 #define ST_PRESS_LPS331AP_ODR_AVL_25HZ_VAL      0x07
  53 #define ST_PRESS_LPS331AP_PW_ADDR               0x20
  54 #define ST_PRESS_LPS331AP_PW_MASK               0x80
  55 #define ST_PRESS_LPS331AP_FS_ADDR               0x23
  56 #define ST_PRESS_LPS331AP_FS_MASK               0x30
  57 #define ST_PRESS_LPS331AP_FS_AVL_1260_VAL       0x00
  58 #define ST_PRESS_LPS331AP_FS_AVL_1260_GAIN      ST_PRESS_KPASCAL_NANO_SCALE
  59 #define ST_PRESS_LPS331AP_FS_AVL_TEMP_GAIN      ST_PRESS_CELSIUS_NANO_SCALE
  60 #define ST_PRESS_LPS331AP_BDU_ADDR              0x20
  61 #define ST_PRESS_LPS331AP_BDU_MASK              0x04
  62 #define ST_PRESS_LPS331AP_DRDY_IRQ_ADDR         0x22
  63 #define ST_PRESS_LPS331AP_DRDY_IRQ_INT1_MASK    0x04
  64 #define ST_PRESS_LPS331AP_DRDY_IRQ_INT2_MASK    0x20
  65 #define ST_PRESS_LPS331AP_MULTIREAD_BIT         true
  66 #define ST_PRESS_LPS331AP_TEMP_OFFSET           42500
  67
  68 /* CUSTOM VALUES FOR LPS001WP SENSOR */
  69 #define ST_PRESS_LPS001WP_WAI_EXP               0xba
  70 #define ST_PRESS_LPS001WP_ODR_ADDR              0x20
  71 #define ST_PRESS_LPS001WP_ODR_MASK              0x30
  72 #define ST_PRESS_LPS001WP_ODR_AVL_1HZ_VAL       0x01
  73 #define ST_PRESS_LPS001WP_ODR_AVL_7HZ_VAL       0x02
  74 #define ST_PRESS_LPS001WP_ODR_AVL_13HZ_VAL      0x03
  75 #define ST_PRESS_LPS001WP_PW_ADDR               0x20
  76 #define ST_PRESS_LPS001WP_PW_MASK               0x40
  77 #define ST_PRESS_LPS001WP_BDU_ADDR              0x20
  78 #define ST_PRESS_LPS001WP_BDU_MASK              0x04
  79 #define ST_PRESS_LPS001WP_MULTIREAD_BIT         true
  80 #define ST_PRESS_LPS001WP_OUT_L_ADDR            0x28
  81 #define ST_TEMP_LPS001WP_OUT_L_ADDR             0x2a
  82
  83 /* CUSTOM VALUES FOR LPS25H SENSOR */
  84 #define ST_PRESS_LPS25H_WAI_EXP                 0xbd
  85 #define ST_PRESS_LPS25H_ODR_ADDR                0x20
  86 #define ST_PRESS_LPS25H_ODR_MASK                0x70
  87 #define ST_PRESS_LPS25H_ODR_AVL_1HZ_VAL         0x01
  88 #define ST_PRESS_LPS25H_ODR_AVL_7HZ_VAL         0x02
  89 #define ST_PRESS_LPS25H_ODR_AVL_13HZ_VAL        0x03
  90 #define ST_PRESS_LPS25H_ODR_AVL_25HZ_VAL        0x04
  91 #define ST_PRESS_LPS25H_PW_ADDR                 0x20
  92 #define ST_PRESS_LPS25H_PW_MASK                 0x80
  93 #define ST_PRESS_LPS25H_FS_ADDR                 0x00
  94 #define ST_PRESS_LPS25H_FS_MASK                 0x00
  95 #define ST_PRESS_LPS25H_FS_AVL_1260_VAL         0x00
  96 #define ST_PRESS_LPS25H_FS_AVL_1260_GAIN        ST_PRESS_KPASCAL_NANO_SCALE
  97 #define ST_PRESS_LPS25H_FS_AVL_TEMP_GAIN        ST_PRESS_CELSIUS_NANO_SCALE
  98 #define ST_PRESS_LPS25H_BDU_ADDR                0x20
  99 #define ST_PRESS_LPS25H_BDU_MASK                0x04
 100 #define ST_PRESS_LPS25H_DRDY_IRQ_ADDR           0x23
 101 #define ST_PRESS_LPS25H_DRDY_IRQ_INT1_MASK      0x01
 102 #define ST_PRESS_LPS25H_DRDY_IRQ_INT2_MASK      0x10
 103 #define ST_PRESS_LPS25H_MULTIREAD_BIT           true
 104 #define ST_PRESS_LPS25H_TEMP_OFFSET             42500
 105 #define ST_PRESS_LPS25H_OUT_XL_ADDR             0x28
 106 #define ST_TEMP_LPS25H_OUT_L_ADDR               0x2b
 107
 108 static const struct iio_chan_spec st_press_1_channels[] = {
 109         {
 110                 .type = IIO_PRESSURE,
 111                 .channel2 = IIO_NO_MOD,
 112                 .address = ST_PRESS_1_OUT_XL_ADDR,
 113                 .scan_index = ST_SENSORS_SCAN_X,
 114                 .scan_type = {
 115                         .sign = 'u',
 116                         .realbits = 24,
 117                         .storagebits = 24,
 118                         .endianness = IIO_LE,
 119                 },
 120                 .info_mask_separate =
 121                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
 122                 .modified = 0,
 123         },
 124         {
 125                 .type = IIO_TEMP,
 126                 .channel2 = IIO_NO_MOD,
 127                 .address = ST_TEMP_1_OUT_L_ADDR,
 128                 .scan_index = -1,
 129                 .scan_type = {
 130                         .sign = 'u',
 131                         .realbits = 16,
 132                         .storagebits = 16,
 133                         .endianness = IIO_LE,
 134                 },
 135                 .info_mask_separate =
 136                         BIT(IIO_CHAN_INFO_RAW) |
 137                         BIT(IIO_CHAN_INFO_SCALE) |
 138                         BIT(IIO_CHAN_INFO_OFFSET),
 139                 .modified = 0,
 140         },
 141         IIO_CHAN_SOFT_TIMESTAMP(1)
 142 };
 143
 144 static const struct iio_chan_spec st_press_lps001wp_channels[] = {
 145         {
 146                 .type = IIO_PRESSURE,
 147                 .channel2 = IIO_NO_MOD,
 148                 .address = ST_PRESS_LPS001WP_OUT_L_ADDR,
 149                 .scan_index = ST_SENSORS_SCAN_X,
 150                 .scan_type = {
 151                         .sign = 'u',
 152                         .realbits = 16,
 153                         .storagebits = 16,
 154                         .endianness = IIO_LE,
 155                 },
 156                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 157                 .modified = 0,
 158         },
 159         {
 160                 .type = IIO_TEMP,
 161                 .channel2 = IIO_NO_MOD,
 162                 .address = ST_TEMP_LPS001WP_OUT_L_ADDR,
 163                 .scan_index = -1,
 164                 .scan_type = {
 165                         .sign = 'u',
 166                         .realbits = 16,
 167                         .storagebits = 16,
 168                         .endianness = IIO_LE,
 169                 },
 170                 .info_mask_separate =
 171                         BIT(IIO_CHAN_INFO_RAW) |
 172                         BIT(IIO_CHAN_INFO_OFFSET),
 173                 .modified = 0,
 174         },
 175         IIO_CHAN_SOFT_TIMESTAMP(1)
 176 };
 177
 178 static const struct st_sensor_settings st_press_sensors_settings[] = {
 179         {
 180                 .wai = ST_PRESS_LPS331AP_WAI_EXP,
 181                 .sensors_supported = {
 182                         [0] = LPS331AP_PRESS_DEV_NAME,
 183                 },
 184                 .ch = (struct iio_chan_spec *)st_press_1_channels,
 185                 .num_ch = ARRAY_SIZE(st_press_1_channels),
 186                 .odr = {
 187                         .addr = ST_PRESS_LPS331AP_ODR_ADDR,
 188                         .mask = ST_PRESS_LPS331AP_ODR_MASK,
 189                         .odr_avl = {
 190                                 { 1, ST_PRESS_LPS331AP_ODR_AVL_1HZ_VAL, },
 191                                 { 7, ST_PRESS_LPS331AP_ODR_AVL_7HZ_VAL, },
 192                                 { 13, ST_PRESS_LPS331AP_ODR_AVL_13HZ_VAL, },
 193                                 { 25, ST_PRESS_LPS331AP_ODR_AVL_25HZ_VAL, },
 194                         },
 195                 },
 196                 .pw = {
 197                         .addr = ST_PRESS_LPS331AP_PW_ADDR,
 198                         .mask = ST_PRESS_LPS331AP_PW_MASK,
 199                         .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
 200                         .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
 201                 },
 202                 .fs = {
 203                         .addr = ST_PRESS_LPS331AP_FS_ADDR,
 204                         .mask = ST_PRESS_LPS331AP_FS_MASK,
 205                         .fs_avl = {
 206                                 [0] = {
 207                                         .num = ST_PRESS_FS_AVL_1260MB,
 208                                         .value = ST_PRESS_LPS331AP_FS_AVL_1260_VAL,
 209                                         .gain = ST_PRESS_LPS331AP_FS_AVL_1260_GAIN,
 210                                         .gain2 = ST_PRESS_LPS331AP_FS_AVL_TEMP_GAIN,
 211                                 },
 212                         },
 213                 },
 214                 .bdu = {
 215                         .addr = ST_PRESS_LPS331AP_BDU_ADDR,
 216                         .mask = ST_PRESS_LPS331AP_BDU_MASK,
 217                 },
 218                 .drdy_irq = {
 219                         .addr = ST_PRESS_LPS331AP_DRDY_IRQ_ADDR,
 220                         .mask_int1 = ST_PRESS_LPS331AP_DRDY_IRQ_INT1_MASK,
 221                         .mask_int2 = ST_PRESS_LPS331AP_DRDY_IRQ_INT2_MASK,
 222                 },
 223                 .multi_read_bit = ST_PRESS_LPS331AP_MULTIREAD_BIT,
 224                 .bootime = 2,
 225         },
 226         {
 227                 .wai = ST_PRESS_LPS001WP_WAI_EXP,
 228                 .sensors_supported = {
 229                         [0] = LPS001WP_PRESS_DEV_NAME,
 230                 },
 231                 .ch = (struct iio_chan_spec *)st_press_lps001wp_channels,
 232                 .num_ch = ARRAY_SIZE(st_press_lps001wp_channels),
 233                 .odr = {
 234                         .addr = ST_PRESS_LPS001WP_ODR_ADDR,
 235                         .mask = ST_PRESS_LPS001WP_ODR_MASK,
 236                         .odr_avl = {
 237                                 { 1, ST_PRESS_LPS001WP_ODR_AVL_1HZ_VAL, },
 238                                 { 7, ST_PRESS_LPS001WP_ODR_AVL_7HZ_VAL, },
 239                                 { 13, ST_PRESS_LPS001WP_ODR_AVL_13HZ_VAL, },
 240                         },
 241                 },
 242                 .pw = {
 243                         .addr = ST_PRESS_LPS001WP_PW_ADDR,
 244                         .mask = ST_PRESS_LPS001WP_PW_MASK,
 245                         .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
 246                         .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
 247                 },
 248                 .fs = {
 249                         .addr = 0,
 250                 },
 251                 .bdu = {
 252                         .addr = ST_PRESS_LPS001WP_BDU_ADDR,
 253                         .mask = ST_PRESS_LPS001WP_BDU_MASK,
 254                 },
 255                 .drdy_irq = {
 256                         .addr = 0,
 257                 },
 258                 .multi_read_bit = ST_PRESS_LPS001WP_MULTIREAD_BIT,
 259                 .bootime = 2,
 260         },
 261         {
 262                 .wai = ST_PRESS_LPS25H_WAI_EXP,
 263                 .sensors_supported = {
 264                         [0] = LPS25H_PRESS_DEV_NAME,
 265                 },
 266                 .ch = (struct iio_chan_spec *)st_press_1_channels,
 267                 .num_ch = ARRAY_SIZE(st_press_1_channels),
 268                 .odr = {
 269                         .addr = ST_PRESS_LPS25H_ODR_ADDR,
 270                         .mask = ST_PRESS_LPS25H_ODR_MASK,
 271                         .odr_avl = {
 272                                 { 1, ST_PRESS_LPS25H_ODR_AVL_1HZ_VAL, },
 273                                 { 7, ST_PRESS_LPS25H_ODR_AVL_7HZ_VAL, },
 274                                 { 13, ST_PRESS_LPS25H_ODR_AVL_13HZ_VAL, },
 275                                 { 25, ST_PRESS_LPS25H_ODR_AVL_25HZ_VAL, },
 276                         },
 277                 },
 278                 .pw = {
 279                         .addr = ST_PRESS_LPS25H_PW_ADDR,
 280                         .mask = ST_PRESS_LPS25H_PW_MASK,
 281                         .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
 282                         .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
 283                 },
 284                 .fs = {
 285                         .addr = ST_PRESS_LPS25H_FS_ADDR,
 286                         .mask = ST_PRESS_LPS25H_FS_MASK,
 287                         .fs_avl = {
 288                                 [0] = {
 289                                         .num = ST_PRESS_FS_AVL_1260MB,
 290                                         .value = ST_PRESS_LPS25H_FS_AVL_1260_VAL,
 291                                         .gain = ST_PRESS_LPS25H_FS_AVL_1260_GAIN,
 292                                         .gain2 = ST_PRESS_LPS25H_FS_AVL_TEMP_GAIN,
 293                                 },
 294                         },
 295                 },
 296                 .bdu = {
 297                         .addr = ST_PRESS_LPS25H_BDU_ADDR,
 298                         .mask = ST_PRESS_LPS25H_BDU_MASK,
 299                 },
 300                 .drdy_irq = {
 301                         .addr = ST_PRESS_LPS25H_DRDY_IRQ_ADDR,
 302                         .mask_int1 = ST_PRESS_LPS25H_DRDY_IRQ_INT1_MASK,
 303                         .mask_int2 = ST_PRESS_LPS25H_DRDY_IRQ_INT2_MASK,
 304                 },
 305                 .multi_read_bit = ST_PRESS_LPS25H_MULTIREAD_BIT,
 306                 .bootime = 2,
 307         },
 308 };
 309
 310 static int st_press_write_raw(struct iio_dev *indio_dev,
 311                               struct iio_chan_spec const *ch,
 312                               int val,
 313                               int val2,
 314                               long mask)
 315 {
 316         int err;
 317
 318         switch (mask) {
 319         case IIO_CHAN_INFO_SAMP_FREQ:
 320                 if (val2)
 321                         return -EINVAL;
 322                 mutex_lock(&indio_dev->mlock);
 323                 err = st_sensors_set_odr(indio_dev, val);
 324                 mutex_unlock(&indio_dev->mlock);
 325                 return err;
 326         default:
 327                 return -EINVAL;
 328         }
 329 }
 330
 331 static int st_press_read_raw(struct iio_dev *indio_dev,
 332                         struct iio_chan_spec const *ch, int *val,
 333                                                         int *val2, long mask)
 334 {
 335         int err;
 336         struct st_sensor_data *press_data = iio_priv(indio_dev);
 337
 338         switch (mask) {
 339         case IIO_CHAN_INFO_RAW:
 340                 err = st_sensors_read_info_raw(indio_dev, ch, val);
 341                 if (err < 0)
 342                         goto read_error;
 343
 344                 return IIO_VAL_INT;
 345         case IIO_CHAN_INFO_SCALE:
 346                 *val = 0;
 347
 348                 switch (ch->type) {
 349                 case IIO_PRESSURE:
 350                         *val2 = press_data->current_fullscale->gain;
 351                         break;
 352                 case IIO_TEMP:
 353                         *val2 = press_data->current_fullscale->gain2;
 354                         break;
 355                 default:
 356                         err = -EINVAL;
 357                         goto read_error;
 358                 }
 359
 360                 return IIO_VAL_INT_PLUS_NANO;
 361         case IIO_CHAN_INFO_OFFSET:
 362                 switch (ch->type) {
 363                 case IIO_TEMP:
 364                         *val = 425;
 365                         *val2 = 10;
 366                         break;
 367                 default:
 368                         err = -EINVAL;
 369                         goto read_error;
 370                 }
 371
 372                 return IIO_VAL_FRACTIONAL;
 373         case IIO_CHAN_INFO_SAMP_FREQ:
 374                 *val = press_data->odr;
 375                 return IIO_VAL_INT;
 376         default:
 377                 return -EINVAL;
 378         }
 379
 380 read_error:
 381         return err;
 382 }
 383
 384 static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();
 385
 386 static struct attribute *st_press_attributes[] = {
 387         &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
 388         NULL,
 389 };
 390
 391 static const struct attribute_group st_press_attribute_group = {
 392         .attrs = st_press_attributes,
 393 };
 394
 395 static const struct iio_info press_info = {
 396         .driver_module = THIS_MODULE,
 397         .attrs = &st_press_attribute_group,
 398         .read_raw = &st_press_read_raw,
 399         .write_raw = &st_press_write_raw,
 400 };
 401
 402 #ifdef CONFIG_IIO_TRIGGER
 403 static const struct iio_trigger_ops st_press_trigger_ops = {
 404         .owner = THIS_MODULE,
 405         .set_trigger_state = ST_PRESS_TRIGGER_SET_STATE,
 406 };
 407 #define ST_PRESS_TRIGGER_OPS (&st_press_trigger_ops)
 408 #else
 409 #define ST_PRESS_TRIGGER_OPS NULL
 410 #endif
 411
 412 int st_press_common_probe(struct iio_dev *indio_dev)
 413 {
 414         struct st_sensor_data *press_data = iio_priv(indio_dev);
 415         int irq = press_data->get_irq_data_ready(indio_dev);
 416         int err;
 417
 418         indio_dev->modes = INDIO_DIRECT_MODE;
 419         indio_dev->info = &press_info;
 420
 421         st_sensors_power_enable(indio_dev);
 422
 423         err = st_sensors_check_device_support(indio_dev,
 424                                         ARRAY_SIZE(st_press_sensors_settings),
 425                                         st_press_sensors_settings);
 426         if (err < 0)
 427                 return err;
 428
 429         press_data->num_data_channels = ST_PRESS_NUMBER_DATA_CHANNELS;
 430         press_data->multiread_bit = press_data->sensor_settings->multi_read_bit;
 431         indio_dev->channels = press_data->sensor_settings->ch;
 432         indio_dev->num_channels = press_data->sensor_settings->num_ch;
 433
 434         if (press_data->sensor_settings->fs.addr != 0)
 435                 press_data->current_fullscale =
 436                         (struct st_sensor_fullscale_avl *)
 437                                 &press_data->sensor_settings->fs.fs_avl[0];
 438
 439         press_data->odr = press_data->sensor_settings->odr.odr_avl[0].hz;
 440
 441         /* Some devices don't support a data ready pin. */
 442         if (!press_data->dev->platform_data &&
 443                                 press_data->sensor_settings->drdy_irq.addr)
 444                 press_data->dev->platform_data =
 445                         (struct st_sensors_platform_data *)&default_press_pdata;
 446
 447         err = st_sensors_init_sensor(indio_dev, press_data->dev->platform_data);
 448         if (err < 0)
 449                 return err;
 450
 451         err = st_press_allocate_ring(indio_dev);
 452         if (err < 0)
 453                 return err;
 454
 455         if (irq > 0) {
 456                 err = st_sensors_allocate_trigger(indio_dev,
 457                                                   ST_PRESS_TRIGGER_OPS);
 458                 if (err < 0)
 459                         goto st_press_probe_trigger_error;
 460         }
 461
 462         err = iio_device_register(indio_dev);
 463         if (err)
 464                 goto st_press_device_register_error;
 465
 466         dev_info(&indio_dev->dev, "registered pressure sensor %s\n",
 467                  indio_dev->name);
 468
 469         return err;
 470
 471 st_press_device_register_error:
 472         if (irq > 0)
 473                 st_sensors_deallocate_trigger(indio_dev);
 474 st_press_probe_trigger_error:
 475         st_press_deallocate_ring(indio_dev);
 476
 477         return err;
 478 }
 479 EXPORT_SYMBOL(st_press_common_probe);
 480
 481 void st_press_common_remove(struct iio_dev *indio_dev)
 482 {
 483         struct st_sensor_data *press_data = iio_priv(indio_dev);
 484
 485         st_sensors_power_disable(indio_dev);
 486
 487         iio_device_unregister(indio_dev);
 488         if (press_data->get_irq_data_ready(indio_dev) > 0)
 489                 st_sensors_deallocate_trigger(indio_dev);
 490
 491         st_press_deallocate_ring(indio_dev);
 492 }
 493 EXPORT_SYMBOL(st_press_common_remove);
 494
 495 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
 496 MODULE_DESCRIPTION("STMicroelectronics pressures driver");
 497 MODULE_LICENSE("GPL v2");