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 = false, 319 .bootime = 2, 320 }, 321 { 322 .wai = 0x40, 323 .wai_addr = 0x4f, 324 .sensors_supported = { 325 [0] = LSM303AGR_MAGN_DEV_NAME, 326 }, 327 .ch = (struct iio_chan_spec *)st_magn_3_16bit_channels, 328 .odr = { 329 .addr = 0x60, 330 .mask = 0x0c, 331 .odr_avl = { 332 { .hz = 10, .value = 0x00 }, 333 { .hz = 20, .value = 0x01 }, 334 { .hz = 50, .value = 0x02 }, 335 { .hz = 100, .value = 0x03 }, 336 }, 337 }, 338 .pw = { 339 .addr = 0x60, 340 .mask = 0x03, 341 .value_on = 0x00, 342 .value_off = 0x03, 343 }, 344 .fs = { 345 .fs_avl = { 346 [0] = { 347 .num = ST_MAGN_FS_AVL_15000MG, 348 .gain = 1500, 349 }, 350 }, 351 }, 352 .bdu = { 353 .addr = 0x62, 354 .mask = 0x10, 355 }, 356 .drdy_irq = { 357 .addr = 0x62, 358 .mask_int1 = 0x01, 359 .addr_ihl = 0x63, 360 .mask_ihl = 0x04, 361 .addr_stat_drdy = ST_SENSORS_DEFAULT_STAT_ADDR, 362 }, 363 .multi_read_bit = false, 364 .bootime = 2, 365 }, 366 }; 367 368 static int st_magn_read_raw(struct iio_dev *indio_dev, 369 struct iio_chan_spec const *ch, int *val, 370 int *val2, long mask) 371 { 372 int err; 373 struct st_sensor_data *mdata = iio_priv(indio_dev); 374 375 switch (mask) { 376 case IIO_CHAN_INFO_RAW: 377 err = st_sensors_read_info_raw(indio_dev, ch, val); 378 if (err < 0) 379 goto read_error; 380 381 return IIO_VAL_INT; 382 case IIO_CHAN_INFO_SCALE: 383 *val = 0; 384 if ((ch->scan_index == ST_SENSORS_SCAN_Z) && 385 (mdata->current_fullscale->gain2 != 0)) 386 *val2 = mdata->current_fullscale->gain2; 387 else 388 *val2 = mdata->current_fullscale->gain; 389 return IIO_VAL_INT_PLUS_MICRO; 390 case IIO_CHAN_INFO_SAMP_FREQ: 391 *val = mdata->odr; 392 return IIO_VAL_INT; 393 default: 394 return -EINVAL; 395 } 396 397 read_error: 398 return err; 399 } 400 401 static int st_magn_write_raw(struct iio_dev *indio_dev, 402 struct iio_chan_spec const *chan, int val, int val2, long mask) 403 { 404 int err; 405 406 switch (mask) { 407 case IIO_CHAN_INFO_SCALE: 408 err = st_sensors_set_fullscale_by_gain(indio_dev, val2); 409 break; 410 case IIO_CHAN_INFO_SAMP_FREQ: 411 if (val2) 412 return -EINVAL; 413 mutex_lock(&indio_dev->mlock); 414 err = st_sensors_set_odr(indio_dev, val); 415 mutex_unlock(&indio_dev->mlock); 416 return err; 417 default: 418 err = -EINVAL; 419 } 420 421 return err; 422 } 423 424 static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL(); 425 static ST_SENSORS_DEV_ATTR_SCALE_AVAIL(in_magn_scale_available); 426 427 static struct attribute *st_magn_attributes[] = { 428 &iio_dev_attr_sampling_frequency_available.dev_attr.attr, 429 &iio_dev_attr_in_magn_scale_available.dev_attr.attr, 430 NULL, 431 }; 432 433 static const struct attribute_group st_magn_attribute_group = { 434 .attrs = st_magn_attributes, 435 }; 436 437 static const struct iio_info magn_info = { 438 .driver_module = THIS_MODULE, 439 .attrs = &st_magn_attribute_group, 440 .read_raw = &st_magn_read_raw, 441 .write_raw = &st_magn_write_raw, 442 .debugfs_reg_access = &st_sensors_debugfs_reg_access, 443 }; 444 445 #ifdef CONFIG_IIO_TRIGGER 446 static const struct iio_trigger_ops st_magn_trigger_ops = { 447 .owner = THIS_MODULE, 448 .set_trigger_state = ST_MAGN_TRIGGER_SET_STATE, 449 .validate_device = st_sensors_validate_device, 450 }; 451 #define ST_MAGN_TRIGGER_OPS (&st_magn_trigger_ops) 452 #else 453 #define ST_MAGN_TRIGGER_OPS NULL 454 #endif 455 456 int st_magn_common_probe(struct iio_dev *indio_dev) 457 { 458 struct st_sensor_data *mdata = iio_priv(indio_dev); 459 int irq = mdata->get_irq_data_ready(indio_dev); 460 int err; 461 462 indio_dev->modes = INDIO_DIRECT_MODE; 463 indio_dev->info = &magn_info; 464 mutex_init(&mdata->tb.buf_lock); 465 466 err = st_sensors_power_enable(indio_dev); 467 if (err) 468 return err; 469 470 err = st_sensors_check_device_support(indio_dev, 471 ARRAY_SIZE(st_magn_sensors_settings), 472 st_magn_sensors_settings); 473 if (err < 0) 474 goto st_magn_power_off; 475 476 mdata->num_data_channels = ST_MAGN_NUMBER_DATA_CHANNELS; 477 mdata->multiread_bit = mdata->sensor_settings->multi_read_bit; 478 indio_dev->channels = mdata->sensor_settings->ch; 479 indio_dev->num_channels = ST_SENSORS_NUMBER_ALL_CHANNELS; 480 481 mdata->current_fullscale = (struct st_sensor_fullscale_avl *) 482 &mdata->sensor_settings->fs.fs_avl[0]; 483 mdata->odr = mdata->sensor_settings->odr.odr_avl[0].hz; 484 485 err = st_sensors_init_sensor(indio_dev, NULL); 486 if (err < 0) 487 goto st_magn_power_off; 488 489 err = st_magn_allocate_ring(indio_dev); 490 if (err < 0) 491 goto st_magn_power_off; 492 493 if (irq > 0) { 494 err = st_sensors_allocate_trigger(indio_dev, 495 ST_MAGN_TRIGGER_OPS); 496 if (err < 0) 497 goto st_magn_probe_trigger_error; 498 } 499 500 err = iio_device_register(indio_dev); 501 if (err) 502 goto st_magn_device_register_error; 503 504 dev_info(&indio_dev->dev, "registered magnetometer %s\n", 505 indio_dev->name); 506 507 return 0; 508 509 st_magn_device_register_error: 510 if (irq > 0) 511 st_sensors_deallocate_trigger(indio_dev); 512 st_magn_probe_trigger_error: 513 st_magn_deallocate_ring(indio_dev); 514 st_magn_power_off: 515 st_sensors_power_disable(indio_dev); 516 517 return err; 518 } 519 EXPORT_SYMBOL(st_magn_common_probe); 520 521 void st_magn_common_remove(struct iio_dev *indio_dev) 522 { 523 struct st_sensor_data *mdata = iio_priv(indio_dev); 524 525 st_sensors_power_disable(indio_dev); 526 527 iio_device_unregister(indio_dev); 528 if (mdata->get_irq_data_ready(indio_dev) > 0) 529 st_sensors_deallocate_trigger(indio_dev); 530 531 st_magn_deallocate_ring(indio_dev); 532 } 533 EXPORT_SYMBOL(st_magn_common_remove); 534 535 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); 536 MODULE_DESCRIPTION("STMicroelectronics magnetometers driver"); 537 MODULE_LICENSE("GPL v2"); 538