drivers/iio/magnetometer/st_magn_core.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * STMicroelectronics magnetometers driver
   4  *
   5  * Copyright 2012-2013 STMicroelectronics Inc.
   6  *
   7  * Denis Ciocca <denis.ciocca@st.com>
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/slab.h>
  13 #include <linux/errno.h>
  14 #include <linux/types.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/i2c.h>
  17 #include <linux/irq.h>
  18 #include <linux/delay.h>
  19 #include <linux/iio/iio.h>
  20 #include <linux/iio/sysfs.h>
  21 #include <linux/iio/buffer.h>
  22
  23 #include <linux/iio/common/st_sensors.h>
  24 #include "st_magn.h"
  25
  26 #define ST_MAGN_NUMBER_DATA_CHANNELS            3
  27
  28 /* DEFAULT VALUE FOR SENSORS */
  29 #define ST_MAGN_DEFAULT_OUT_X_H_ADDR            0x03
  30 #define ST_MAGN_DEFAULT_OUT_Y_H_ADDR            0x07
  31 #define ST_MAGN_DEFAULT_OUT_Z_H_ADDR            0x05
  32
  33 /* FULLSCALE */
  34 #define ST_MAGN_FS_AVL_1300MG                   1300
  35 #define ST_MAGN_FS_AVL_1900MG                   1900
  36 #define ST_MAGN_FS_AVL_2500MG                   2500
  37 #define ST_MAGN_FS_AVL_4000MG                   4000
  38 #define ST_MAGN_FS_AVL_4700MG                   4700
  39 #define ST_MAGN_FS_AVL_5600MG                   5600
  40 #define ST_MAGN_FS_AVL_8000MG                   8000
  41 #define ST_MAGN_FS_AVL_8100MG                   8100
  42 #define ST_MAGN_FS_AVL_12000MG                  12000
  43 #define ST_MAGN_FS_AVL_15000MG                  15000
  44 #define ST_MAGN_FS_AVL_16000MG                  16000
  45
  46 /* Special L addresses for Sensor 2 */
  47 #define ST_MAGN_2_OUT_X_L_ADDR                  0x28
  48 #define ST_MAGN_2_OUT_Y_L_ADDR                  0x2a
  49 #define ST_MAGN_2_OUT_Z_L_ADDR                  0x2c
  50
  51 /* Special L addresses for sensor 3 */
  52 #define ST_MAGN_3_OUT_X_L_ADDR                  0x68
  53 #define ST_MAGN_3_OUT_Y_L_ADDR                  0x6a
  54 #define ST_MAGN_3_OUT_Z_L_ADDR                  0x6c
  55
  56 static const struct iio_chan_spec st_magn_16bit_channels[] = {
  57         ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
  58                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
  59                         ST_SENSORS_SCAN_X, 1, IIO_MOD_X, 's', IIO_BE, 16, 16,
  60                         ST_MAGN_DEFAULT_OUT_X_H_ADDR),
  61         ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
  62                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
  63                         ST_SENSORS_SCAN_Y, 1, IIO_MOD_Y, 's', IIO_BE, 16, 16,
  64                         ST_MAGN_DEFAULT_OUT_Y_H_ADDR),
  65         ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
  66                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
  67                         ST_SENSORS_SCAN_Z, 1, IIO_MOD_Z, 's', IIO_BE, 16, 16,
  68                         ST_MAGN_DEFAULT_OUT_Z_H_ADDR),
  69         IIO_CHAN_SOFT_TIMESTAMP(3)
  70 };
  71
  72 static const struct iio_chan_spec st_magn_2_16bit_channels[] = {
  73         ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
  74                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
  75                         ST_SENSORS_SCAN_X, 1, IIO_MOD_X, 's', IIO_LE, 16, 16,
  76                         ST_MAGN_2_OUT_X_L_ADDR),
  77         ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
  78                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
  79                         ST_SENSORS_SCAN_Y, 1, IIO_MOD_Y, 's', IIO_LE, 16, 16,
  80                         ST_MAGN_2_OUT_Y_L_ADDR),
  81         ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
  82                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
  83                         ST_SENSORS_SCAN_Z, 1, IIO_MOD_Z, 's', IIO_LE, 16, 16,
  84                         ST_MAGN_2_OUT_Z_L_ADDR),
  85         IIO_CHAN_SOFT_TIMESTAMP(3)
  86 };
  87
  88 static const struct iio_chan_spec st_magn_3_16bit_channels[] = {
  89         ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
  90                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
  91                         ST_SENSORS_SCAN_X, 1, IIO_MOD_X, 's', IIO_LE, 16, 16,
  92                         ST_MAGN_3_OUT_X_L_ADDR),
  93         ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
  94                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
  95                         ST_SENSORS_SCAN_Y, 1, IIO_MOD_Y, 's', IIO_LE, 16, 16,
  96                         ST_MAGN_3_OUT_Y_L_ADDR),
  97         ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
  98                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
  99                         ST_SENSORS_SCAN_Z, 1, IIO_MOD_Z, 's', IIO_LE, 16, 16,
 100                         ST_MAGN_3_OUT_Z_L_ADDR),
 101         IIO_CHAN_SOFT_TIMESTAMP(3)
 102 };
 103
 104 static const struct st_sensor_settings st_magn_sensors_settings[] = {
 105         {
 106                 .wai = 0, /* This sensor has no valid WhoAmI report 0 */
 107                 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
 108                 .sensors_supported = {
 109                         [0] = LSM303DLH_MAGN_DEV_NAME,
 110                 },
 111                 .ch = (struct iio_chan_spec *)st_magn_16bit_channels,
 112                 .odr = {
 113                         .addr = 0x00,
 114                         .mask = 0x1c,
 115                         .odr_avl = {
 116                                 { .hz = 1, .value = 0x00 },
 117                                 { .hz = 2, .value = 0x01 },
 118                                 { .hz = 3, .value = 0x02 },
 119                                 { .hz = 8, .value = 0x03 },
 120                                 { .hz = 15, .value = 0x04 },
 121                                 { .hz = 30, .value = 0x05 },
 122                                 { .hz = 75, .value = 0x06 },
 123                                 /* 220 Hz, 0x07 reportedly exist */
 124                         },
 125                 },
 126                 .pw = {
 127                         .addr = 0x02,
 128                         .mask = 0x03,
 129                         .value_on = 0x00,
 130                         .value_off = 0x03,
 131                 },
 132                 .fs = {
 133                         .addr = 0x01,
 134                         .mask = 0xe0,
 135                         .fs_avl = {
 136                                 [0] = {
 137                                         .num = ST_MAGN_FS_AVL_1300MG,
 138                                         .value = 0x01,
 139                                         .gain = 1100,
 140                                         .gain2 = 980,
 141                                 },
 142                                 [1] = {
 143                                         .num = ST_MAGN_FS_AVL_1900MG,
 144                                         .value = 0x02,
 145                                         .gain = 855,
 146                                         .gain2 = 760,
 147                                 },
 148                                 [2] = {
 149                                         .num = ST_MAGN_FS_AVL_2500MG,
 150                                         .value = 0x03,
 151                                         .gain = 670,
 152                                         .gain2 = 600,
 153                                 },
 154                                 [3] = {
 155                                         .num = ST_MAGN_FS_AVL_4000MG,
 156                                         .value = 0x04,
 157                                         .gain = 450,
 158                                         .gain2 = 400,
 159                                 },
 160                                 [4] = {
 161                                         .num = ST_MAGN_FS_AVL_4700MG,
 162                                         .value = 0x05,
 163                                         .gain = 400,
 164                                         .gain2 = 355,
 165                                 },
 166                                 [5] = {
 167                                         .num = ST_MAGN_FS_AVL_5600MG,
 168                                         .value = 0x06,
 169                                         .gain = 330,
 170                                         .gain2 = 295,
 171                                 },
 172                                 [6] = {
 173                                         .num = ST_MAGN_FS_AVL_8100MG,
 174                                         .value = 0x07,
 175                                         .gain = 230,
 176                                         .gain2 = 205,
 177                                 },
 178                         },
 179                 },
 180                 .multi_read_bit = false,
 181                 .bootime = 2,
 182         },
 183         {
 184                 .wai = 0x3c,
 185                 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
 186                 .sensors_supported = {
 187                         [0] = LSM303DLHC_MAGN_DEV_NAME,
 188                         [1] = LSM303DLM_MAGN_DEV_NAME,
 189                 },
 190                 .ch = (struct iio_chan_spec *)st_magn_16bit_channels,
 191                 .odr = {
 192                         .addr = 0x00,
 193                         .mask = 0x1c,
 194                         .odr_avl = {
 195                                 { .hz = 1, .value = 0x00 },
 196                                 { .hz = 2, .value = 0x01 },
 197                                 { .hz = 3, .value = 0x02 },
 198                                 { .hz = 8, .value = 0x03 },
 199                                 { .hz = 15, .value = 0x04 },
 200                                 { .hz = 30, .value = 0x05 },
 201                                 { .hz = 75, .value = 0x06 },
 202                                 { .hz = 220, .value = 0x07 },
 203                         },
 204                 },
 205                 .pw = {
 206                         .addr = 0x02,
 207                         .mask = 0x03,
 208                         .value_on = 0x00,
 209                         .value_off = 0x03,
 210                 },
 211                 .fs = {
 212                         .addr = 0x01,
 213                         .mask = 0xe0,
 214                         .fs_avl = {
 215                                 [0] = {
 216                                         .num = ST_MAGN_FS_AVL_1300MG,
 217                                         .value = 0x01,
 218                                         .gain = 909,
 219                                         .gain2 = 1020,
 220                                 },
 221                                 [1] = {
 222                                         .num = ST_MAGN_FS_AVL_1900MG,
 223                                         .value = 0x02,
 224                                         .gain = 1169,
 225                                         .gain2 = 1315,
 226                                 },
 227                                 [2] = {
 228                                         .num = ST_MAGN_FS_AVL_2500MG,
 229                                         .value = 0x03,
 230                                         .gain = 1492,
 231                                         .gain2 = 1666,
 232                                 },
 233                                 [3] = {
 234                                         .num = ST_MAGN_FS_AVL_4000MG,
 235                                         .value = 0x04,
 236                                         .gain = 2222,
 237                                         .gain2 = 2500,
 238                                 },
 239                                 [4] = {
 240                                         .num = ST_MAGN_FS_AVL_4700MG,
 241                                         .value = 0x05,
 242                                         .gain = 2500,
 243                                         .gain2 = 2816,
 244                                 },
 245                                 [5] = {
 246                                         .num = ST_MAGN_FS_AVL_5600MG,
 247                                         .value = 0x06,
 248                                         .gain = 3030,
 249                                         .gain2 = 3389,
 250                                 },
 251                                 [6] = {
 252                                         .num = ST_MAGN_FS_AVL_8100MG,
 253                                         .value = 0x07,
 254                                         .gain = 4347,
 255                                         .gain2 = 4878,
 256                                 },
 257                         },
 258                 },
 259                 .multi_read_bit = false,
 260                 .bootime = 2,
 261         },
 262         {
 263                 .wai = 0x3d,
 264                 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
 265                 .sensors_supported = {
 266                         [0] = LIS3MDL_MAGN_DEV_NAME,
 267                         [1] = LSM9DS1_MAGN_DEV_NAME,
 268                 },
 269                 .ch = (struct iio_chan_spec *)st_magn_2_16bit_channels,
 270                 .odr = {
 271                         .addr = 0x20,
 272                         .mask = 0x1c,
 273                         .odr_avl = {
 274                                 { .hz = 1, .value = 0x00 },
 275                                 { .hz = 2, .value = 0x01 },
 276                                 { .hz = 3, .value = 0x02 },
 277                                 { .hz = 5, .value = 0x03 },
 278                                 { .hz = 10, .value = 0x04 },
 279                                 { .hz = 20, .value = 0x05 },
 280                                 { .hz = 40, .value = 0x06 },
 281                                 { .hz = 80, .value = 0x07 },
 282                         },
 283                 },
 284                 .pw = {
 285                         .addr = 0x22,
 286                         .mask = 0x03,
 287                         .value_on = 0x00,
 288                         .value_off = 0x03,
 289                 },
 290                 .fs = {
 291                         .addr = 0x21,
 292                         .mask = 0x60,
 293                         .fs_avl = {
 294                                 [0] = {
 295                                         .num = ST_MAGN_FS_AVL_4000MG,
 296                                         .value = 0x00,
 297                                         .gain = 146,
 298                                 },
 299                                 [1] = {
 300                                         .num = ST_MAGN_FS_AVL_8000MG,
 301                                         .value = 0x01,
 302                                         .gain = 292,
 303                                 },
 304                                 [2] = {
 305                                         .num = ST_MAGN_FS_AVL_12000MG,
 306                                         .value = 0x02,
 307                                         .gain = 438,
 308                                 },
 309                                 [3] = {
 310                                         .num = ST_MAGN_FS_AVL_16000MG,
 311                                         .value = 0x03,
 312                                         .gain = 584,
 313                                 },
 314                         },
 315                 },
 316                 .bdu = {
 317                         .addr = 0x24,
 318                         .mask = 0x40,
 319                 },
 320                 .drdy_irq = {
 321                         /* drdy line is routed drdy pin */
 322                         .stat_drdy = {
 323                                 .addr = ST_SENSORS_DEFAULT_STAT_ADDR,
 324                                 .mask = 0x07,
 325                         },
 326                 },
 327                 .sim = {
 328                         .addr = 0x22,
 329                         .value = BIT(2),
 330                 },
 331                 .multi_read_bit = true,
 332                 .bootime = 2,
 333         },
 334         {
 335                 .wai = 0x40,
 336                 .wai_addr = 0x4f,
 337                 .sensors_supported = {
 338                         [0] = LSM303AGR_MAGN_DEV_NAME,
 339                         [1] = LIS2MDL_MAGN_DEV_NAME,
 340                 },
 341                 .ch = (struct iio_chan_spec *)st_magn_3_16bit_channels,
 342                 .odr = {
 343                         .addr = 0x60,
 344                         .mask = 0x0c,
 345                         .odr_avl = {
 346                                 { .hz = 10, .value = 0x00 },
 347                                 { .hz = 20, .value = 0x01 },
 348                                 { .hz = 50, .value = 0x02 },
 349                                 { .hz = 100, .value = 0x03 },
 350                         },
 351                 },
 352                 .pw = {
 353                         .addr = 0x60,
 354                         .mask = 0x03,
 355                         .value_on = 0x00,
 356                         .value_off = 0x03,
 357                 },
 358                 .fs = {
 359                         .fs_avl = {
 360                                 [0] = {
 361                                         .num = ST_MAGN_FS_AVL_15000MG,
 362                                         .gain = 1500,
 363                                 },
 364                         },
 365                 },
 366                 .bdu = {
 367                         .addr = 0x62,
 368                         .mask = 0x10,
 369                 },
 370                 .drdy_irq = {
 371                         .int1 = {
 372                                 .addr = 0x62,
 373                                 .mask = 0x01,
 374                         },
 375                         .stat_drdy = {
 376                                 .addr = 0x67,
 377                                 .mask = 0x07,
 378                         },
 379                 },
 380                 .multi_read_bit = false,
 381                 .bootime = 2,
 382         },
 383 };
 384
 385 static int st_magn_read_raw(struct iio_dev *indio_dev,
 386                         struct iio_chan_spec const *ch, int *val,
 387                                                         int *val2, long mask)
 388 {
 389         int err;
 390         struct st_sensor_data *mdata = iio_priv(indio_dev);
 391
 392         switch (mask) {
 393         case IIO_CHAN_INFO_RAW:
 394                 err = st_sensors_read_info_raw(indio_dev, ch, val);
 395                 if (err < 0)
 396                         goto read_error;
 397
 398                 return IIO_VAL_INT;
 399         case IIO_CHAN_INFO_SCALE:
 400                 *val = 0;
 401                 if ((ch->scan_index == ST_SENSORS_SCAN_Z) &&
 402                                         (mdata->current_fullscale->gain2 != 0))
 403                         *val2 = mdata->current_fullscale->gain2;
 404                 else
 405                         *val2 = mdata->current_fullscale->gain;
 406                 return IIO_VAL_INT_PLUS_MICRO;
 407         case IIO_CHAN_INFO_SAMP_FREQ:
 408                 *val = mdata->odr;
 409                 return IIO_VAL_INT;
 410         default:
 411                 return -EINVAL;
 412         }
 413
 414 read_error:
 415         return err;
 416 }
 417
 418 static int st_magn_write_raw(struct iio_dev *indio_dev,
 419                 struct iio_chan_spec const *chan, int val, int val2, long mask)
 420 {
 421         int err;
 422
 423         switch (mask) {
 424         case IIO_CHAN_INFO_SCALE:
 425                 err = st_sensors_set_fullscale_by_gain(indio_dev, val2);
 426                 break;
 427         case IIO_CHAN_INFO_SAMP_FREQ:
 428                 if (val2)
 429                         return -EINVAL;
 430                 mutex_lock(&indio_dev->mlock);
 431                 err = st_sensors_set_odr(indio_dev, val);
 432                 mutex_unlock(&indio_dev->mlock);
 433                 return err;
 434         default:
 435                 err = -EINVAL;
 436         }
 437
 438         return err;
 439 }
 440
 441 static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();
 442 static ST_SENSORS_DEV_ATTR_SCALE_AVAIL(in_magn_scale_available);
 443
 444 static struct attribute *st_magn_attributes[] = {
 445         &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
 446         &iio_dev_attr_in_magn_scale_available.dev_attr.attr,
 447         NULL,
 448 };
 449
 450 static const struct attribute_group st_magn_attribute_group = {
 451         .attrs = st_magn_attributes,
 452 };
 453
 454 static const struct iio_info magn_info = {
 455         .attrs = &st_magn_attribute_group,
 456         .read_raw = &st_magn_read_raw,
 457         .write_raw = &st_magn_write_raw,
 458         .debugfs_reg_access = &st_sensors_debugfs_reg_access,
 459 };
 460
 461 #ifdef CONFIG_IIO_TRIGGER
 462 static const struct iio_trigger_ops st_magn_trigger_ops = {
 463         .set_trigger_state = ST_MAGN_TRIGGER_SET_STATE,
 464         .validate_device = st_sensors_validate_device,
 465 };
 466 #define ST_MAGN_TRIGGER_OPS (&st_magn_trigger_ops)
 467 #else
 468 #define ST_MAGN_TRIGGER_OPS NULL
 469 #endif
 470
 471 /*
 472  * st_magn_get_settings() - get sensor settings from device name
 473  * @name: device name buffer reference.
 474  *
 475  * Return: valid reference on success, NULL otherwise.
 476  */
 477 const struct st_sensor_settings *st_magn_get_settings(const char *name)
 478 {
 479         int index = st_sensors_get_settings_index(name,
 480                                         st_magn_sensors_settings,
 481                                         ARRAY_SIZE(st_magn_sensors_settings));
 482         if (index < 0)
 483                 return NULL;
 484
 485         return &st_magn_sensors_settings[index];
 486 }
 487 EXPORT_SYMBOL(st_magn_get_settings);
 488
 489 int st_magn_common_probe(struct iio_dev *indio_dev)
 490 {
 491         struct st_sensor_data *mdata = iio_priv(indio_dev);
 492         int err;
 493
 494         indio_dev->modes = INDIO_DIRECT_MODE;
 495         indio_dev->info = &magn_info;
 496
 497         err = st_sensors_verify_id(indio_dev);
 498         if (err < 0)
 499                 return err;
 500
 501         mdata->num_data_channels = ST_MAGN_NUMBER_DATA_CHANNELS;
 502         indio_dev->channels = mdata->sensor_settings->ch;
 503         indio_dev->num_channels = ST_SENSORS_NUMBER_ALL_CHANNELS;
 504
 505         mdata->current_fullscale = &mdata->sensor_settings->fs.fs_avl[0];
 506         mdata->odr = mdata->sensor_settings->odr.odr_avl[0].hz;
 507
 508         err = st_sensors_init_sensor(indio_dev, NULL);
 509         if (err < 0)
 510                 return err;
 511
 512         err = st_magn_allocate_ring(indio_dev);
 513         if (err < 0)
 514                 return err;
 515
 516         if (mdata->irq > 0) {
 517                 err = st_sensors_allocate_trigger(indio_dev,
 518                                                 ST_MAGN_TRIGGER_OPS);
 519                 if (err < 0)
 520                         goto st_magn_probe_trigger_error;
 521         }
 522
 523         err = iio_device_register(indio_dev);
 524         if (err)
 525                 goto st_magn_device_register_error;
 526
 527         dev_info(&indio_dev->dev, "registered magnetometer %s\n",
 528                  indio_dev->name);
 529
 530         return 0;
 531
 532 st_magn_device_register_error:
 533         if (mdata->irq > 0)
 534                 st_sensors_deallocate_trigger(indio_dev);
 535 st_magn_probe_trigger_error:
 536         st_magn_deallocate_ring(indio_dev);
 537         return err;
 538 }
 539 EXPORT_SYMBOL(st_magn_common_probe);
 540
 541 void st_magn_common_remove(struct iio_dev *indio_dev)
 542 {
 543         struct st_sensor_data *mdata = iio_priv(indio_dev);
 544
 545         iio_device_unregister(indio_dev);
 546         if (mdata->irq > 0)
 547                 st_sensors_deallocate_trigger(indio_dev);
 548
 549         st_magn_deallocate_ring(indio_dev);
 550 }
 551 EXPORT_SYMBOL(st_magn_common_remove);
 552
 553 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
 554 MODULE_DESCRIPTION("STMicroelectronics magnetometers driver");
 555 MODULE_LICENSE("GPL v2");