drivers/iio/magnetometer/st_magn_core.c

   1 /*
   2  * STMicroelectronics magnetometers driver
   3  *
   4  * Copyright 2012-2013 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/buffer.h>
  25
  26 #include <linux/iio/common/st_sensors.h>
  27 #include "st_magn.h"
  28
  29 #define ST_MAGN_NUMBER_DATA_CHANNELS            3
  30
  31 /* DEFAULT VALUE FOR SENSORS */
  32 #define ST_MAGN_DEFAULT_OUT_X_H_ADDR            0X03
  33 #define ST_MAGN_DEFAULT_OUT_Y_H_ADDR            0X07
  34 #define ST_MAGN_DEFAULT_OUT_Z_H_ADDR            0X05
  35
  36 /* FULLSCALE */
  37 #define ST_MAGN_FS_AVL_1300MG                   1300
  38 #define ST_MAGN_FS_AVL_1900MG                   1900
  39 #define ST_MAGN_FS_AVL_2500MG                   2500
  40 #define ST_MAGN_FS_AVL_4000MG                   4000
  41 #define ST_MAGN_FS_AVL_4700MG                   4700
  42 #define ST_MAGN_FS_AVL_5600MG                   5600
  43 #define ST_MAGN_FS_AVL_8000MG                   8000
  44 #define ST_MAGN_FS_AVL_8100MG                   8100
  45 #define ST_MAGN_FS_AVL_12000MG                  12000
  46 #define ST_MAGN_FS_AVL_15000MG                  15000
  47 #define ST_MAGN_FS_AVL_16000MG                  16000
  48
  49 /* Special L addresses for Sensor 2 */
  50 #define ST_MAGN_2_OUT_X_L_ADDR                  0x28
  51 #define ST_MAGN_2_OUT_Y_L_ADDR                  0x2a
  52 #define ST_MAGN_2_OUT_Z_L_ADDR                  0x2c
  53
  54 /* Special L addresses for sensor 3 */
  55 #define ST_MAGN_3_OUT_X_L_ADDR                  0x68
  56 #define ST_MAGN_3_OUT_Y_L_ADDR                  0x6a
  57 #define ST_MAGN_3_OUT_Z_L_ADDR                  0x6c
  58
  59 static const struct iio_chan_spec st_magn_16bit_channels[] = {
  60         ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
  61                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
  62                         ST_SENSORS_SCAN_X, 1, IIO_MOD_X, 's', IIO_BE, 16, 16,
  63                         ST_MAGN_DEFAULT_OUT_X_H_ADDR),
  64         ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
  65                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
  66                         ST_SENSORS_SCAN_Y, 1, IIO_MOD_Y, 's', IIO_BE, 16, 16,
  67                         ST_MAGN_DEFAULT_OUT_Y_H_ADDR),
  68         ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
  69                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
  70                         ST_SENSORS_SCAN_Z, 1, IIO_MOD_Z, 's', IIO_BE, 16, 16,
  71                         ST_MAGN_DEFAULT_OUT_Z_H_ADDR),
  72         IIO_CHAN_SOFT_TIMESTAMP(3)
  73 };
  74
  75 static const struct iio_chan_spec st_magn_2_16bit_channels[] = {
  76         ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
  77                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
  78                         ST_SENSORS_SCAN_X, 1, IIO_MOD_X, 's', IIO_LE, 16, 16,
  79                         ST_MAGN_2_OUT_X_L_ADDR),
  80         ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
  81                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
  82                         ST_SENSORS_SCAN_Y, 1, IIO_MOD_Y, 's', IIO_LE, 16, 16,
  83                         ST_MAGN_2_OUT_Y_L_ADDR),
  84         ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
  85                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
  86                         ST_SENSORS_SCAN_Z, 1, IIO_MOD_Z, 's', IIO_LE, 16, 16,
  87                         ST_MAGN_2_OUT_Z_L_ADDR),
  88         IIO_CHAN_SOFT_TIMESTAMP(3)
  89 };
  90
  91 static const struct iio_chan_spec st_magn_3_16bit_channels[] = {
  92         ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
  93                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
  94                         ST_SENSORS_SCAN_X, 1, IIO_MOD_X, 's', IIO_LE, 16, 16,
  95                         ST_MAGN_3_OUT_X_L_ADDR),
  96         ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
  97                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
  98                         ST_SENSORS_SCAN_Y, 1, IIO_MOD_Y, 's', IIO_LE, 16, 16,
  99                         ST_MAGN_3_OUT_Y_L_ADDR),
 100         ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
 101                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
 102                         ST_SENSORS_SCAN_Z, 1, IIO_MOD_Z, 's', IIO_LE, 16, 16,
 103                         ST_MAGN_3_OUT_Z_L_ADDR),
 104         IIO_CHAN_SOFT_TIMESTAMP(3)
 105 };
 106
 107 static const struct st_sensor_settings st_magn_sensors_settings[] = {
 108         {
 109                 .wai = 0, /* This sensor has no valid WhoAmI report 0 */
 110                 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
 111                 .sensors_supported = {
 112                         [0] = LSM303DLH_MAGN_DEV_NAME,
 113                 },
 114                 .ch = (struct iio_chan_spec *)st_magn_16bit_channels,
 115                 .odr = {
 116                         .addr = 0x00,
 117                         .mask = 0x1c,
 118                         .odr_avl = {
 119                                 { .hz = 1, .value = 0x00 },
 120                                 { .hz = 2, .value = 0x01 },
 121                                 { .hz = 3, .value = 0x02 },
 122                                 { .hz = 8, .value = 0x03 },
 123                                 { .hz = 15, .value = 0x04 },
 124                                 { .hz = 30, .value = 0x05 },
 125                                 { .hz = 75, .value = 0x06 },
 126                                 /* 220 Hz, 0x07 reportedly exist */
 127                         },
 128                 },
 129                 .pw = {
 130                         .addr = 0x02,
 131                         .mask = 0x03,
 132                         .value_on = 0x00,
 133                         .value_off = 0x03,
 134                 },
 135                 .fs = {
 136                         .addr = 0x01,
 137                         .mask = 0xe0,
 138                         .fs_avl = {
 139                                 [0] = {
 140                                         .num = ST_MAGN_FS_AVL_1300MG,
 141                                         .value = 0x01,
 142                                         .gain = 1100,
 143                                         .gain2 = 980,
 144                                 },
 145                                 [1] = {
 146                                         .num = ST_MAGN_FS_AVL_1900MG,
 147                                         .value = 0x02,
 148                                         .gain = 855,
 149                                         .gain2 = 760,
 150                                 },
 151                                 [2] = {
 152                                         .num = ST_MAGN_FS_AVL_2500MG,
 153                                         .value = 0x03,
 154                                         .gain = 670,
 155                                         .gain2 = 600,
 156                                 },
 157                                 [3] = {
 158                                         .num = ST_MAGN_FS_AVL_4000MG,
 159                                         .value = 0x04,
 160                                         .gain = 450,
 161                                         .gain2 = 400,
 162                                 },
 163                                 [4] = {
 164                                         .num = ST_MAGN_FS_AVL_4700MG,
 165                                         .value = 0x05,
 166                                         .gain = 400,
 167                                         .gain2 = 355,
 168                                 },
 169                                 [5] = {
 170                                         .num = ST_MAGN_FS_AVL_5600MG,
 171                                         .value = 0x06,
 172                                         .gain = 330,
 173                                         .gain2 = 295,
 174                                 },
 175                                 [6] = {
 176                                         .num = ST_MAGN_FS_AVL_8100MG,
 177                                         .value = 0x07,
 178                                         .gain = 230,
 179                                         .gain2 = 205,
 180                                 },
 181                         },
 182                 },
 183                 .multi_read_bit = false,
 184                 .bootime = 2,
 185         },
 186         {
 187                 .wai = 0x3c,
 188                 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
 189                 .sensors_supported = {
 190                         [0] = LSM303DLHC_MAGN_DEV_NAME,
 191                         [1] = LSM303DLM_MAGN_DEV_NAME,
 192                 },
 193                 .ch = (struct iio_chan_spec *)st_magn_16bit_channels,
 194                 .odr = {
 195                         .addr = 0x00,
 196                         .mask = 0x1c,
 197                         .odr_avl = {
 198                                 { .hz = 1, .value = 0x00 },
 199                                 { .hz = 2, .value = 0x01 },
 200                                 { .hz = 3, .value = 0x02 },
 201                                 { .hz = 8, .value = 0x03 },
 202                                 { .hz = 15, .value = 0x04 },
 203                                 { .hz = 30, .value = 0x05 },
 204                                 { .hz = 75, .value = 0x06 },
 205                                 { .hz = 220, .value = 0x07 },
 206                         },
 207                 },
 208                 .pw = {
 209                         .addr = 0x02,
 210                         .mask = 0x03,
 211                         .value_on = 0x00,
 212                         .value_off = 0x03,
 213                 },
 214                 .fs = {
 215                         .addr = 0x01,
 216                         .mask = 0xe0,
 217                         .fs_avl = {
 218                                 [0] = {
 219                                         .num = ST_MAGN_FS_AVL_1300MG,
 220                                         .value = 0x01,
 221                                         .gain = 909,
 222                                         .gain2 = 1020,
 223                                 },
 224                                 [1] = {
 225                                         .num = ST_MAGN_FS_AVL_1900MG,
 226                                         .value = 0x02,
 227                                         .gain = 1169,
 228                                         .gain2 = 1315,
 229                                 },
 230                                 [2] = {
 231                                         .num = ST_MAGN_FS_AVL_2500MG,
 232                                         .value = 0x03,
 233                                         .gain = 1492,
 234                                         .gain2 = 1666,
 235                                 },
 236                                 [3] = {
 237                                         .num = ST_MAGN_FS_AVL_4000MG,
 238                                         .value = 0x04,
 239                                         .gain = 2222,
 240                                         .gain2 = 2500,
 241                                 },
 242                                 [4] = {
 243                                         .num = ST_MAGN_FS_AVL_4700MG,
 244                                         .value = 0x05,
 245                                         .gain = 2500,
 246                                         .gain2 = 2816,
 247                                 },
 248                                 [5] = {
 249                                         .num = ST_MAGN_FS_AVL_5600MG,
 250                                         .value = 0x06,
 251                                         .gain = 3030,
 252                                         .gain2 = 3389,
 253                                 },
 254                                 [6] = {
 255                                         .num = ST_MAGN_FS_AVL_8100MG,
 256                                         .value = 0x07,
 257                                         .gain = 4347,
 258                                         .gain2 = 4878,
 259                                 },
 260                         },
 261                 },
 262                 .multi_read_bit = false,
 263                 .bootime = 2,
 264         },
 265         {
 266                 .wai = 0x3d,
 267                 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
 268                 .sensors_supported = {
 269                         [0] = LIS3MDL_MAGN_DEV_NAME,
 270                 },
 271                 .ch = (struct iio_chan_spec *)st_magn_2_16bit_channels,
 272                 .odr = {
 273                         .addr = 0x20,
 274                         .mask = 0x1c,
 275                         .odr_avl = {
 276                                 { .hz = 1, .value = 0x00 },
 277                                 { .hz = 2, .value = 0x01 },
 278                                 { .hz = 3, .value = 0x02 },
 279                                 { .hz = 5, .value = 0x03 },
 280                                 { .hz = 10, .value = 0x04 },
 281                                 { .hz = 20, .value = 0x05 },
 282                                 { .hz = 40, .value = 0x06 },
 283                                 { .hz = 80, .value = 0x07 },
 284                         },
 285                 },
 286                 .pw = {
 287                         .addr = 0x22,
 288                         .mask = 0x03,
 289                         .value_on = 0x00,
 290                         .value_off = 0x03,
 291                 },
 292                 .fs = {
 293                         .addr = 0x21,
 294                         .mask = 0x60,
 295                         .fs_avl = {
 296                                 [0] = {
 297                                         .num = ST_MAGN_FS_AVL_4000MG,
 298                                         .value = 0x00,
 299                                         .gain = 146,
 300                                 },
 301                                 [1] = {
 302                                         .num = ST_MAGN_FS_AVL_8000MG,
 303                                         .value = 0x01,
 304                                         .gain = 292,
 305                                 },
 306                                 [2] = {
 307                                         .num = ST_MAGN_FS_AVL_12000MG,
 308                                         .value = 0x02,
 309                                         .gain = 438,
 310                                 },
 311                                 [3] = {
 312                                         .num = ST_MAGN_FS_AVL_16000MG,
 313                                         .value = 0x03,
 314                                         .gain = 584,
 315                                 },
 316                         },
 317                 },
 318                 .multi_read_bit = true,
 319                 .bootime = 2,
 320         },
 321         {
 322                 .wai = 0x40,
 323                 .wai_addr = 0x4f,
 324                 .sensors_supported = {
 325                         [0] = LSM303AGR_MAGN_DEV_NAME,
 326                         [1] = LIS2MDL_MAGN_DEV_NAME,
 327                 },
 328                 .ch = (struct iio_chan_spec *)st_magn_3_16bit_channels,
 329                 .odr = {
 330                         .addr = 0x60,
 331                         .mask = 0x0c,
 332                         .odr_avl = {
 333                                 { .hz = 10, .value = 0x00 },
 334                                 { .hz = 20, .value = 0x01 },
 335                                 { .hz = 50, .value = 0x02 },
 336                                 { .hz = 100, .value = 0x03 },
 337                         },
 338                 },
 339                 .pw = {
 340                         .addr = 0x60,
 341                         .mask = 0x03,
 342                         .value_on = 0x00,
 343                         .value_off = 0x03,
 344                 },
 345                 .fs = {
 346                         .fs_avl = {
 347                                 [0] = {
 348                                         .num = ST_MAGN_FS_AVL_15000MG,
 349                                         .gain = 1500,
 350                                 },
 351                         },
 352                 },
 353                 .bdu = {
 354                         .addr = 0x62,
 355                         .mask = 0x10,
 356                 },
 357                 .drdy_irq = {
 358                         .addr = 0x62,
 359                         .mask_int1 = 0x01,
 360                         .addr_stat_drdy = 0x67,
 361                 },
 362                 .multi_read_bit = false,
 363                 .bootime = 2,
 364         },
 365 };
 366
 367 static int st_magn_read_raw(struct iio_dev *indio_dev,
 368                         struct iio_chan_spec const *ch, int *val,
 369                                                         int *val2, long mask)
 370 {
 371         int err;
 372         struct st_sensor_data *mdata = iio_priv(indio_dev);
 373
 374         switch (mask) {
 375         case IIO_CHAN_INFO_RAW:
 376                 err = st_sensors_read_info_raw(indio_dev, ch, val);
 377                 if (err < 0)
 378                         goto read_error;
 379
 380                 return IIO_VAL_INT;
 381         case IIO_CHAN_INFO_SCALE:
 382                 *val = 0;
 383                 if ((ch->scan_index == ST_SENSORS_SCAN_Z) &&
 384                                         (mdata->current_fullscale->gain2 != 0))
 385                         *val2 = mdata->current_fullscale->gain2;
 386                 else
 387                         *val2 = mdata->current_fullscale->gain;
 388                 return IIO_VAL_INT_PLUS_MICRO;
 389         case IIO_CHAN_INFO_SAMP_FREQ:
 390                 *val = mdata->odr;
 391                 return IIO_VAL_INT;
 392         default:
 393                 return -EINVAL;
 394         }
 395
 396 read_error:
 397         return err;
 398 }
 399
 400 static int st_magn_write_raw(struct iio_dev *indio_dev,
 401                 struct iio_chan_spec const *chan, int val, int val2, long mask)
 402 {
 403         int err;
 404
 405         switch (mask) {
 406         case IIO_CHAN_INFO_SCALE:
 407                 err = st_sensors_set_fullscale_by_gain(indio_dev, val2);
 408                 break;
 409         case IIO_CHAN_INFO_SAMP_FREQ:
 410                 if (val2)
 411                         return -EINVAL;
 412                 mutex_lock(&indio_dev->mlock);
 413                 err = st_sensors_set_odr(indio_dev, val);
 414                 mutex_unlock(&indio_dev->mlock);
 415                 return err;
 416         default:
 417                 err = -EINVAL;
 418         }
 419
 420         return err;
 421 }
 422
 423 static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();
 424 static ST_SENSORS_DEV_ATTR_SCALE_AVAIL(in_magn_scale_available);
 425
 426 static struct attribute *st_magn_attributes[] = {
 427         &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
 428         &iio_dev_attr_in_magn_scale_available.dev_attr.attr,
 429         NULL,
 430 };
 431
 432 static const struct attribute_group st_magn_attribute_group = {
 433         .attrs = st_magn_attributes,
 434 };
 435
 436 static const struct iio_info magn_info = {
 437         .attrs = &st_magn_attribute_group,
 438         .read_raw = &st_magn_read_raw,
 439         .write_raw = &st_magn_write_raw,
 440         .debugfs_reg_access = &st_sensors_debugfs_reg_access,
 441 };
 442
 443 #ifdef CONFIG_IIO_TRIGGER
 444 static const struct iio_trigger_ops st_magn_trigger_ops = {
 445         .set_trigger_state = ST_MAGN_TRIGGER_SET_STATE,
 446         .validate_device = st_sensors_validate_device,
 447 };
 448 #define ST_MAGN_TRIGGER_OPS (&st_magn_trigger_ops)
 449 #else
 450 #define ST_MAGN_TRIGGER_OPS NULL
 451 #endif
 452
 453 int st_magn_common_probe(struct iio_dev *indio_dev)
 454 {
 455         struct st_sensor_data *mdata = iio_priv(indio_dev);
 456         int irq = mdata->get_irq_data_ready(indio_dev);
 457         int err;
 458
 459         indio_dev->modes = INDIO_DIRECT_MODE;
 460         indio_dev->info = &magn_info;
 461         mutex_init(&mdata->tb.buf_lock);
 462
 463         err = st_sensors_power_enable(indio_dev);
 464         if (err)
 465                 return err;
 466
 467         err = st_sensors_check_device_support(indio_dev,
 468                                         ARRAY_SIZE(st_magn_sensors_settings),
 469                                         st_magn_sensors_settings);
 470         if (err < 0)
 471                 goto st_magn_power_off;
 472
 473         mdata->num_data_channels = ST_MAGN_NUMBER_DATA_CHANNELS;
 474         mdata->multiread_bit = mdata->sensor_settings->multi_read_bit;
 475         indio_dev->channels = mdata->sensor_settings->ch;
 476         indio_dev->num_channels = ST_SENSORS_NUMBER_ALL_CHANNELS;
 477
 478         mdata->current_fullscale = (struct st_sensor_fullscale_avl *)
 479                                         &mdata->sensor_settings->fs.fs_avl[0];
 480         mdata->odr = mdata->sensor_settings->odr.odr_avl[0].hz;
 481
 482         err = st_sensors_init_sensor(indio_dev, NULL);
 483         if (err < 0)
 484                 goto st_magn_power_off;
 485
 486         err = st_magn_allocate_ring(indio_dev);
 487         if (err < 0)
 488                 goto st_magn_power_off;
 489
 490         if (irq > 0) {
 491                 err = st_sensors_allocate_trigger(indio_dev,
 492                                                 ST_MAGN_TRIGGER_OPS);
 493                 if (err < 0)
 494                         goto st_magn_probe_trigger_error;
 495         }
 496
 497         err = iio_device_register(indio_dev);
 498         if (err)
 499                 goto st_magn_device_register_error;
 500
 501         dev_info(&indio_dev->dev, "registered magnetometer %s\n",
 502                  indio_dev->name);
 503
 504         return 0;
 505
 506 st_magn_device_register_error:
 507         if (irq > 0)
 508                 st_sensors_deallocate_trigger(indio_dev);
 509 st_magn_probe_trigger_error:
 510         st_magn_deallocate_ring(indio_dev);
 511 st_magn_power_off:
 512         st_sensors_power_disable(indio_dev);
 513
 514         return err;
 515 }
 516 EXPORT_SYMBOL(st_magn_common_probe);
 517
 518 void st_magn_common_remove(struct iio_dev *indio_dev)
 519 {
 520         struct st_sensor_data *mdata = iio_priv(indio_dev);
 521
 522         st_sensors_power_disable(indio_dev);
 523
 524         iio_device_unregister(indio_dev);
 525         if (mdata->get_irq_data_ready(indio_dev) > 0)
 526                 st_sensors_deallocate_trigger(indio_dev);
 527
 528         st_magn_deallocate_ring(indio_dev);
 529 }
 530 EXPORT_SYMBOL(st_magn_common_remove);
 531
 532 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
 533 MODULE_DESCRIPTION("STMicroelectronics magnetometers driver");
 534 MODULE_LICENSE("GPL v2");