1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * BMG160 Gyro Sensor driver 4 * Copyright (c) 2014, Intel Corporation. 5 */ 6 7 #include <linux/module.h> 8 #include <linux/interrupt.h> 9 #include <linux/delay.h> 10 #include <linux/slab.h> 11 #include <linux/acpi.h> 12 #include <linux/pm.h> 13 #include <linux/pm_runtime.h> 14 #include <linux/iio/iio.h> 15 #include <linux/iio/sysfs.h> 16 #include <linux/iio/buffer.h> 17 #include <linux/iio/trigger.h> 18 #include <linux/iio/events.h> 19 #include <linux/iio/trigger_consumer.h> 20 #include <linux/iio/triggered_buffer.h> 21 #include <linux/regmap.h> 22 #include <linux/regulator/consumer.h> 23 #include "bmg160.h" 24 25 #define BMG160_IRQ_NAME "bmg160_event" 26 27 #define BMG160_REG_CHIP_ID 0x00 28 #define BMG160_CHIP_ID_VAL 0x0F 29 30 #define BMG160_REG_PMU_LPW 0x11 31 #define BMG160_MODE_NORMAL 0x00 32 #define BMG160_MODE_DEEP_SUSPEND 0x20 33 #define BMG160_MODE_SUSPEND 0x80 34 35 #define BMG160_REG_RANGE 0x0F 36 37 #define BMG160_RANGE_2000DPS 0 38 #define BMG160_RANGE_1000DPS 1 39 #define BMG160_RANGE_500DPS 2 40 #define BMG160_RANGE_250DPS 3 41 #define BMG160_RANGE_125DPS 4 42 43 #define BMG160_REG_PMU_BW 0x10 44 #define BMG160_NO_FILTER 0 45 #define BMG160_DEF_BW 100 46 #define BMG160_REG_PMU_BW_RES BIT(7) 47 48 #define BMG160_GYRO_REG_RESET 0x14 49 #define BMG160_GYRO_RESET_VAL 0xb6 50 51 #define BMG160_REG_INT_MAP_0 0x17 52 #define BMG160_INT_MAP_0_BIT_ANY BIT(1) 53 54 #define BMG160_REG_INT_MAP_1 0x18 55 #define BMG160_INT_MAP_1_BIT_NEW_DATA BIT(0) 56 57 #define BMG160_REG_INT_RST_LATCH 0x21 58 #define BMG160_INT_MODE_LATCH_RESET 0x80 59 #define BMG160_INT_MODE_LATCH_INT 0x0F 60 #define BMG160_INT_MODE_NON_LATCH_INT 0x00 61 62 #define BMG160_REG_INT_EN_0 0x15 63 #define BMG160_DATA_ENABLE_INT BIT(7) 64 65 #define BMG160_REG_INT_EN_1 0x16 66 #define BMG160_INT1_BIT_OD BIT(1) 67 68 #define BMG160_REG_XOUT_L 0x02 69 #define BMG160_AXIS_TO_REG(axis) (BMG160_REG_XOUT_L + (axis * 2)) 70 71 #define BMG160_REG_SLOPE_THRES 0x1B 72 #define BMG160_SLOPE_THRES_MASK 0x0F 73 74 #define BMG160_REG_MOTION_INTR 0x1C 75 #define BMG160_INT_MOTION_X BIT(0) 76 #define BMG160_INT_MOTION_Y BIT(1) 77 #define BMG160_INT_MOTION_Z BIT(2) 78 #define BMG160_ANY_DUR_MASK 0x30 79 #define BMG160_ANY_DUR_SHIFT 4 80 81 #define BMG160_REG_INT_STATUS_2 0x0B 82 #define BMG160_ANY_MOTION_MASK 0x07 83 #define BMG160_ANY_MOTION_BIT_X BIT(0) 84 #define BMG160_ANY_MOTION_BIT_Y BIT(1) 85 #define BMG160_ANY_MOTION_BIT_Z BIT(2) 86 87 #define BMG160_REG_TEMP 0x08 88 #define BMG160_TEMP_CENTER_VAL 23 89 90 #define BMG160_MAX_STARTUP_TIME_MS 80 91 92 #define BMG160_AUTO_SUSPEND_DELAY_MS 2000 93 94 struct bmg160_data { 95 struct regmap *regmap; 96 struct iio_trigger *dready_trig; 97 struct iio_trigger *motion_trig; 98 struct iio_mount_matrix orientation; 99 struct mutex mutex; 100 /* Ensure naturally aligned timestamp */ 101 struct { 102 s16 chans[3]; 103 s64 timestamp __aligned(8); 104 } scan; 105 u32 dps_range; 106 int ev_enable_state; 107 int slope_thres; 108 bool dready_trigger_on; 109 bool motion_trigger_on; 110 int irq; 111 }; 112 113 enum bmg160_axis { 114 AXIS_X, 115 AXIS_Y, 116 AXIS_Z, 117 AXIS_MAX, 118 }; 119 120 static const struct { 121 int odr; 122 int filter; 123 int bw_bits; 124 } bmg160_samp_freq_table[] = { {100, 32, 0x07}, 125 {200, 64, 0x06}, 126 {100, 12, 0x05}, 127 {200, 23, 0x04}, 128 {400, 47, 0x03}, 129 {1000, 116, 0x02}, 130 {2000, 230, 0x01} }; 131 132 static const struct { 133 int scale; 134 int dps_range; 135 } bmg160_scale_table[] = { { 1065, BMG160_RANGE_2000DPS}, 136 { 532, BMG160_RANGE_1000DPS}, 137 { 266, BMG160_RANGE_500DPS}, 138 { 133, BMG160_RANGE_250DPS}, 139 { 66, BMG160_RANGE_125DPS} }; 140 141 static int bmg160_set_mode(struct bmg160_data *data, u8 mode) 142 { 143 struct device *dev = regmap_get_device(data->regmap); 144 int ret; 145 146 ret = regmap_write(data->regmap, BMG160_REG_PMU_LPW, mode); 147 if (ret < 0) { 148 dev_err(dev, "Error writing reg_pmu_lpw\n"); 149 return ret; 150 } 151 152 return 0; 153 } 154 155 static int bmg160_convert_freq_to_bit(int val) 156 { 157 int i; 158 159 for (i = 0; i < ARRAY_SIZE(bmg160_samp_freq_table); ++i) { 160 if (bmg160_samp_freq_table[i].odr == val) 161 return bmg160_samp_freq_table[i].bw_bits; 162 } 163 164 return -EINVAL; 165 } 166 167 static int bmg160_set_bw(struct bmg160_data *data, int val) 168 { 169 struct device *dev = regmap_get_device(data->regmap); 170 int ret; 171 int bw_bits; 172 173 bw_bits = bmg160_convert_freq_to_bit(val); 174 if (bw_bits < 0) 175 return bw_bits; 176 177 ret = regmap_write(data->regmap, BMG160_REG_PMU_BW, bw_bits); 178 if (ret < 0) { 179 dev_err(dev, "Error writing reg_pmu_bw\n"); 180 return ret; 181 } 182 183 return 0; 184 } 185 186 static int bmg160_get_filter(struct bmg160_data *data, int *val) 187 { 188 struct device *dev = regmap_get_device(data->regmap); 189 int ret; 190 int i; 191 unsigned int bw_bits; 192 193 ret = regmap_read(data->regmap, BMG160_REG_PMU_BW, &bw_bits); 194 if (ret < 0) { 195 dev_err(dev, "Error reading reg_pmu_bw\n"); 196 return ret; 197 } 198 199 /* Ignore the readonly reserved bit. */ 200 bw_bits &= ~BMG160_REG_PMU_BW_RES; 201 202 for (i = 0; i < ARRAY_SIZE(bmg160_samp_freq_table); ++i) { 203 if (bmg160_samp_freq_table[i].bw_bits == bw_bits) 204 break; 205 } 206 207 *val = bmg160_samp_freq_table[i].filter; 208 209 return ret ? ret : IIO_VAL_INT; 210 } 211 212 213 static int bmg160_set_filter(struct bmg160_data *data, int val) 214 { 215 struct device *dev = regmap_get_device(data->regmap); 216 int ret; 217 int i; 218 219 for (i = 0; i < ARRAY_SIZE(bmg160_samp_freq_table); ++i) { 220 if (bmg160_samp_freq_table[i].filter == val) 221 break; 222 } 223 224 ret = regmap_write(data->regmap, BMG160_REG_PMU_BW, 225 bmg160_samp_freq_table[i].bw_bits); 226 if (ret < 0) { 227 dev_err(dev, "Error writing reg_pmu_bw\n"); 228 return ret; 229 } 230 231 return 0; 232 } 233 234 static int bmg160_chip_init(struct bmg160_data *data) 235 { 236 struct device *dev = regmap_get_device(data->regmap); 237 int ret; 238 unsigned int val; 239 240 /* 241 * Reset chip to get it in a known good state. A delay of 30ms after 242 * reset is required according to the datasheet. 243 */ 244 regmap_write(data->regmap, BMG160_GYRO_REG_RESET, 245 BMG160_GYRO_RESET_VAL); 246 usleep_range(30000, 30700); 247 248 ret = regmap_read(data->regmap, BMG160_REG_CHIP_ID, &val); 249 if (ret < 0) { 250 dev_err(dev, "Error reading reg_chip_id\n"); 251 return ret; 252 } 253 254 dev_dbg(dev, "Chip Id %x\n", val); 255 if (val != BMG160_CHIP_ID_VAL) { 256 dev_err(dev, "invalid chip %x\n", val); 257 return -ENODEV; 258 } 259 260 ret = bmg160_set_mode(data, BMG160_MODE_NORMAL); 261 if (ret < 0) 262 return ret; 263 264 /* Wait upto 500 ms to be ready after changing mode */ 265 usleep_range(500, 1000); 266 267 /* Set Bandwidth */ 268 ret = bmg160_set_bw(data, BMG160_DEF_BW); 269 if (ret < 0) 270 return ret; 271 272 /* Set Default Range */ 273 ret = regmap_write(data->regmap, BMG160_REG_RANGE, BMG160_RANGE_500DPS); 274 if (ret < 0) { 275 dev_err(dev, "Error writing reg_range\n"); 276 return ret; 277 } 278 data->dps_range = BMG160_RANGE_500DPS; 279 280 ret = regmap_read(data->regmap, BMG160_REG_SLOPE_THRES, &val); 281 if (ret < 0) { 282 dev_err(dev, "Error reading reg_slope_thres\n"); 283 return ret; 284 } 285 data->slope_thres = val; 286 287 /* Set default interrupt mode */ 288 ret = regmap_clear_bits(data->regmap, BMG160_REG_INT_EN_1, 289 BMG160_INT1_BIT_OD); 290 if (ret < 0) { 291 dev_err(dev, "Error updating bits in reg_int_en_1\n"); 292 return ret; 293 } 294 295 ret = regmap_write(data->regmap, BMG160_REG_INT_RST_LATCH, 296 BMG160_INT_MODE_LATCH_INT | 297 BMG160_INT_MODE_LATCH_RESET); 298 if (ret < 0) { 299 dev_err(dev, 300 "Error writing reg_motion_intr\n"); 301 return ret; 302 } 303 304 return 0; 305 } 306 307 static int bmg160_set_power_state(struct bmg160_data *data, bool on) 308 { 309 #ifdef CONFIG_PM 310 struct device *dev = regmap_get_device(data->regmap); 311 int ret; 312 313 if (on) 314 ret = pm_runtime_get_sync(dev); 315 else { 316 pm_runtime_mark_last_busy(dev); 317 ret = pm_runtime_put_autosuspend(dev); 318 } 319 320 if (ret < 0) { 321 dev_err(dev, "Failed: bmg160_set_power_state for %d\n", on); 322 323 if (on) 324 pm_runtime_put_noidle(dev); 325 326 return ret; 327 } 328 #endif 329 330 return 0; 331 } 332 333 static int bmg160_setup_any_motion_interrupt(struct bmg160_data *data, 334 bool status) 335 { 336 struct device *dev = regmap_get_device(data->regmap); 337 int ret; 338 339 /* Enable/Disable INT_MAP0 mapping */ 340 ret = regmap_update_bits(data->regmap, BMG160_REG_INT_MAP_0, 341 BMG160_INT_MAP_0_BIT_ANY, 342 (status ? BMG160_INT_MAP_0_BIT_ANY : 0)); 343 if (ret < 0) { 344 dev_err(dev, "Error updating bits reg_int_map0\n"); 345 return ret; 346 } 347 348 /* Enable/Disable slope interrupts */ 349 if (status) { 350 /* Update slope thres */ 351 ret = regmap_write(data->regmap, BMG160_REG_SLOPE_THRES, 352 data->slope_thres); 353 if (ret < 0) { 354 dev_err(dev, "Error writing reg_slope_thres\n"); 355 return ret; 356 } 357 358 ret = regmap_write(data->regmap, BMG160_REG_MOTION_INTR, 359 BMG160_INT_MOTION_X | BMG160_INT_MOTION_Y | 360 BMG160_INT_MOTION_Z); 361 if (ret < 0) { 362 dev_err(dev, "Error writing reg_motion_intr\n"); 363 return ret; 364 } 365 366 /* 367 * New data interrupt is always non-latched, 368 * which will have higher priority, so no need 369 * to set latched mode, we will be flooded anyway with INTR 370 */ 371 if (!data->dready_trigger_on) { 372 ret = regmap_write(data->regmap, 373 BMG160_REG_INT_RST_LATCH, 374 BMG160_INT_MODE_LATCH_INT | 375 BMG160_INT_MODE_LATCH_RESET); 376 if (ret < 0) { 377 dev_err(dev, "Error writing reg_rst_latch\n"); 378 return ret; 379 } 380 } 381 382 ret = regmap_write(data->regmap, BMG160_REG_INT_EN_0, 383 BMG160_DATA_ENABLE_INT); 384 385 } else { 386 ret = regmap_write(data->regmap, BMG160_REG_INT_EN_0, 0); 387 } 388 389 if (ret < 0) { 390 dev_err(dev, "Error writing reg_int_en0\n"); 391 return ret; 392 } 393 394 return 0; 395 } 396 397 static int bmg160_setup_new_data_interrupt(struct bmg160_data *data, 398 bool status) 399 { 400 struct device *dev = regmap_get_device(data->regmap); 401 int ret; 402 403 /* Enable/Disable INT_MAP1 mapping */ 404 ret = regmap_update_bits(data->regmap, BMG160_REG_INT_MAP_1, 405 BMG160_INT_MAP_1_BIT_NEW_DATA, 406 (status ? BMG160_INT_MAP_1_BIT_NEW_DATA : 0)); 407 if (ret < 0) { 408 dev_err(dev, "Error updating bits in reg_int_map1\n"); 409 return ret; 410 } 411 412 if (status) { 413 ret = regmap_write(data->regmap, BMG160_REG_INT_RST_LATCH, 414 BMG160_INT_MODE_NON_LATCH_INT | 415 BMG160_INT_MODE_LATCH_RESET); 416 if (ret < 0) { 417 dev_err(dev, "Error writing reg_rst_latch\n"); 418 return ret; 419 } 420 421 ret = regmap_write(data->regmap, BMG160_REG_INT_EN_0, 422 BMG160_DATA_ENABLE_INT); 423 424 } else { 425 /* Restore interrupt mode */ 426 ret = regmap_write(data->regmap, BMG160_REG_INT_RST_LATCH, 427 BMG160_INT_MODE_LATCH_INT | 428 BMG160_INT_MODE_LATCH_RESET); 429 if (ret < 0) { 430 dev_err(dev, "Error writing reg_rst_latch\n"); 431 return ret; 432 } 433 434 ret = regmap_write(data->regmap, BMG160_REG_INT_EN_0, 0); 435 } 436 437 if (ret < 0) { 438 dev_err(dev, "Error writing reg_int_en0\n"); 439 return ret; 440 } 441 442 return 0; 443 } 444 445 static int bmg160_get_bw(struct bmg160_data *data, int *val) 446 { 447 struct device *dev = regmap_get_device(data->regmap); 448 int i; 449 unsigned int bw_bits; 450 int ret; 451 452 ret = regmap_read(data->regmap, BMG160_REG_PMU_BW, &bw_bits); 453 if (ret < 0) { 454 dev_err(dev, "Error reading reg_pmu_bw\n"); 455 return ret; 456 } 457 458 /* Ignore the readonly reserved bit. */ 459 bw_bits &= ~BMG160_REG_PMU_BW_RES; 460 461 for (i = 0; i < ARRAY_SIZE(bmg160_samp_freq_table); ++i) { 462 if (bmg160_samp_freq_table[i].bw_bits == bw_bits) { 463 *val = bmg160_samp_freq_table[i].odr; 464 return IIO_VAL_INT; 465 } 466 } 467 468 return -EINVAL; 469 } 470 471 static int bmg160_set_scale(struct bmg160_data *data, int val) 472 { 473 struct device *dev = regmap_get_device(data->regmap); 474 int ret, i; 475 476 for (i = 0; i < ARRAY_SIZE(bmg160_scale_table); ++i) { 477 if (bmg160_scale_table[i].scale == val) { 478 ret = regmap_write(data->regmap, BMG160_REG_RANGE, 479 bmg160_scale_table[i].dps_range); 480 if (ret < 0) { 481 dev_err(dev, "Error writing reg_range\n"); 482 return ret; 483 } 484 data->dps_range = bmg160_scale_table[i].dps_range; 485 return 0; 486 } 487 } 488 489 return -EINVAL; 490 } 491 492 static int bmg160_get_temp(struct bmg160_data *data, int *val) 493 { 494 struct device *dev = regmap_get_device(data->regmap); 495 int ret; 496 unsigned int raw_val; 497 498 mutex_lock(&data->mutex); 499 ret = bmg160_set_power_state(data, true); 500 if (ret < 0) { 501 mutex_unlock(&data->mutex); 502 return ret; 503 } 504 505 ret = regmap_read(data->regmap, BMG160_REG_TEMP, &raw_val); 506 if (ret < 0) { 507 dev_err(dev, "Error reading reg_temp\n"); 508 bmg160_set_power_state(data, false); 509 mutex_unlock(&data->mutex); 510 return ret; 511 } 512 513 *val = sign_extend32(raw_val, 7); 514 ret = bmg160_set_power_state(data, false); 515 mutex_unlock(&data->mutex); 516 if (ret < 0) 517 return ret; 518 519 return IIO_VAL_INT; 520 } 521 522 static int bmg160_get_axis(struct bmg160_data *data, int axis, int *val) 523 { 524 struct device *dev = regmap_get_device(data->regmap); 525 int ret; 526 __le16 raw_val; 527 528 mutex_lock(&data->mutex); 529 ret = bmg160_set_power_state(data, true); 530 if (ret < 0) { 531 mutex_unlock(&data->mutex); 532 return ret; 533 } 534 535 ret = regmap_bulk_read(data->regmap, BMG160_AXIS_TO_REG(axis), &raw_val, 536 sizeof(raw_val)); 537 if (ret < 0) { 538 dev_err(dev, "Error reading axis %d\n", axis); 539 bmg160_set_power_state(data, false); 540 mutex_unlock(&data->mutex); 541 return ret; 542 } 543 544 *val = sign_extend32(le16_to_cpu(raw_val), 15); 545 ret = bmg160_set_power_state(data, false); 546 mutex_unlock(&data->mutex); 547 if (ret < 0) 548 return ret; 549 550 return IIO_VAL_INT; 551 } 552 553 static int bmg160_read_raw(struct iio_dev *indio_dev, 554 struct iio_chan_spec const *chan, 555 int *val, int *val2, long mask) 556 { 557 struct bmg160_data *data = iio_priv(indio_dev); 558 int ret; 559 560 switch (mask) { 561 case IIO_CHAN_INFO_RAW: 562 switch (chan->type) { 563 case IIO_TEMP: 564 return bmg160_get_temp(data, val); 565 case IIO_ANGL_VEL: 566 if (iio_buffer_enabled(indio_dev)) 567 return -EBUSY; 568 else 569 return bmg160_get_axis(data, chan->scan_index, 570 val); 571 default: 572 return -EINVAL; 573 } 574 case IIO_CHAN_INFO_OFFSET: 575 if (chan->type == IIO_TEMP) { 576 *val = BMG160_TEMP_CENTER_VAL; 577 return IIO_VAL_INT; 578 } else 579 return -EINVAL; 580 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: 581 return bmg160_get_filter(data, val); 582 case IIO_CHAN_INFO_SCALE: 583 switch (chan->type) { 584 case IIO_TEMP: 585 *val = 500; 586 return IIO_VAL_INT; 587 case IIO_ANGL_VEL: 588 { 589 int i; 590 591 for (i = 0; i < ARRAY_SIZE(bmg160_scale_table); ++i) { 592 if (bmg160_scale_table[i].dps_range == 593 data->dps_range) { 594 *val = 0; 595 *val2 = bmg160_scale_table[i].scale; 596 return IIO_VAL_INT_PLUS_MICRO; 597 } 598 } 599 return -EINVAL; 600 } 601 default: 602 return -EINVAL; 603 } 604 case IIO_CHAN_INFO_SAMP_FREQ: 605 *val2 = 0; 606 mutex_lock(&data->mutex); 607 ret = bmg160_get_bw(data, val); 608 mutex_unlock(&data->mutex); 609 return ret; 610 default: 611 return -EINVAL; 612 } 613 } 614 615 static int bmg160_write_raw(struct iio_dev *indio_dev, 616 struct iio_chan_spec const *chan, 617 int val, int val2, long mask) 618 { 619 struct bmg160_data *data = iio_priv(indio_dev); 620 int ret; 621 622 switch (mask) { 623 case IIO_CHAN_INFO_SAMP_FREQ: 624 mutex_lock(&data->mutex); 625 /* 626 * Section 4.2 of spec 627 * In suspend mode, the only supported operations are reading 628 * registers as well as writing to the (0x14) softreset 629 * register. Since we will be in suspend mode by default, change 630 * mode to power on for other writes. 631 */ 632 ret = bmg160_set_power_state(data, true); 633 if (ret < 0) { 634 mutex_unlock(&data->mutex); 635 return ret; 636 } 637 ret = bmg160_set_bw(data, val); 638 if (ret < 0) { 639 bmg160_set_power_state(data, false); 640 mutex_unlock(&data->mutex); 641 return ret; 642 } 643 ret = bmg160_set_power_state(data, false); 644 mutex_unlock(&data->mutex); 645 return ret; 646 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: 647 if (val2) 648 return -EINVAL; 649 650 mutex_lock(&data->mutex); 651 ret = bmg160_set_power_state(data, true); 652 if (ret < 0) { 653 bmg160_set_power_state(data, false); 654 mutex_unlock(&data->mutex); 655 return ret; 656 } 657 ret = bmg160_set_filter(data, val); 658 if (ret < 0) { 659 bmg160_set_power_state(data, false); 660 mutex_unlock(&data->mutex); 661 return ret; 662 } 663 ret = bmg160_set_power_state(data, false); 664 mutex_unlock(&data->mutex); 665 return ret; 666 case IIO_CHAN_INFO_SCALE: 667 if (val) 668 return -EINVAL; 669 670 mutex_lock(&data->mutex); 671 /* Refer to comments above for the suspend mode ops */ 672 ret = bmg160_set_power_state(data, true); 673 if (ret < 0) { 674 mutex_unlock(&data->mutex); 675 return ret; 676 } 677 ret = bmg160_set_scale(data, val2); 678 if (ret < 0) { 679 bmg160_set_power_state(data, false); 680 mutex_unlock(&data->mutex); 681 return ret; 682 } 683 ret = bmg160_set_power_state(data, false); 684 mutex_unlock(&data->mutex); 685 return ret; 686 default: 687 return -EINVAL; 688 } 689 690 return -EINVAL; 691 } 692 693 static int bmg160_read_event(struct iio_dev *indio_dev, 694 const struct iio_chan_spec *chan, 695 enum iio_event_type type, 696 enum iio_event_direction dir, 697 enum iio_event_info info, 698 int *val, int *val2) 699 { 700 struct bmg160_data *data = iio_priv(indio_dev); 701 702 *val2 = 0; 703 switch (info) { 704 case IIO_EV_INFO_VALUE: 705 *val = data->slope_thres & BMG160_SLOPE_THRES_MASK; 706 break; 707 default: 708 return -EINVAL; 709 } 710 711 return IIO_VAL_INT; 712 } 713 714 static int bmg160_write_event(struct iio_dev *indio_dev, 715 const struct iio_chan_spec *chan, 716 enum iio_event_type type, 717 enum iio_event_direction dir, 718 enum iio_event_info info, 719 int val, int val2) 720 { 721 struct bmg160_data *data = iio_priv(indio_dev); 722 723 switch (info) { 724 case IIO_EV_INFO_VALUE: 725 if (data->ev_enable_state) 726 return -EBUSY; 727 data->slope_thres &= ~BMG160_SLOPE_THRES_MASK; 728 data->slope_thres |= (val & BMG160_SLOPE_THRES_MASK); 729 break; 730 default: 731 return -EINVAL; 732 } 733 734 return 0; 735 } 736 737 static int bmg160_read_event_config(struct iio_dev *indio_dev, 738 const struct iio_chan_spec *chan, 739 enum iio_event_type type, 740 enum iio_event_direction dir) 741 { 742 743 struct bmg160_data *data = iio_priv(indio_dev); 744 745 return data->ev_enable_state; 746 } 747 748 static int bmg160_write_event_config(struct iio_dev *indio_dev, 749 const struct iio_chan_spec *chan, 750 enum iio_event_type type, 751 enum iio_event_direction dir, 752 int state) 753 { 754 struct bmg160_data *data = iio_priv(indio_dev); 755 int ret; 756 757 if (state && data->ev_enable_state) 758 return 0; 759 760 mutex_lock(&data->mutex); 761 762 if (!state && data->motion_trigger_on) { 763 data->ev_enable_state = 0; 764 mutex_unlock(&data->mutex); 765 return 0; 766 } 767 /* 768 * We will expect the enable and disable to do operation 769 * in reverse order. This will happen here anyway as our 770 * resume operation uses sync mode runtime pm calls, the 771 * suspend operation will be delayed by autosuspend delay 772 * So the disable operation will still happen in reverse of 773 * enable operation. When runtime pm is disabled the mode 774 * is always on so sequence doesn't matter 775 */ 776 ret = bmg160_set_power_state(data, state); 777 if (ret < 0) { 778 mutex_unlock(&data->mutex); 779 return ret; 780 } 781 782 ret = bmg160_setup_any_motion_interrupt(data, state); 783 if (ret < 0) { 784 bmg160_set_power_state(data, false); 785 mutex_unlock(&data->mutex); 786 return ret; 787 } 788 789 data->ev_enable_state = state; 790 mutex_unlock(&data->mutex); 791 792 return 0; 793 } 794 795 static const struct iio_mount_matrix * 796 bmg160_get_mount_matrix(const struct iio_dev *indio_dev, 797 const struct iio_chan_spec *chan) 798 { 799 struct bmg160_data *data = iio_priv(indio_dev); 800 801 return &data->orientation; 802 } 803 804 static const struct iio_chan_spec_ext_info bmg160_ext_info[] = { 805 IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, bmg160_get_mount_matrix), 806 { } 807 }; 808 809 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("100 200 400 1000 2000"); 810 811 static IIO_CONST_ATTR(in_anglvel_scale_available, 812 "0.001065 0.000532 0.000266 0.000133 0.000066"); 813 814 static struct attribute *bmg160_attributes[] = { 815 &iio_const_attr_sampling_frequency_available.dev_attr.attr, 816 &iio_const_attr_in_anglvel_scale_available.dev_attr.attr, 817 NULL, 818 }; 819 820 static const struct attribute_group bmg160_attrs_group = { 821 .attrs = bmg160_attributes, 822 }; 823 824 static const struct iio_event_spec bmg160_event = { 825 .type = IIO_EV_TYPE_ROC, 826 .dir = IIO_EV_DIR_EITHER, 827 .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) | 828 BIT(IIO_EV_INFO_ENABLE) 829 }; 830 831 #define BMG160_CHANNEL(_axis) { \ 832 .type = IIO_ANGL_VEL, \ 833 .modified = 1, \ 834 .channel2 = IIO_MOD_##_axis, \ 835 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ 836 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ 837 BIT(IIO_CHAN_INFO_SAMP_FREQ) | \ 838 BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \ 839 .scan_index = AXIS_##_axis, \ 840 .scan_type = { \ 841 .sign = 's', \ 842 .realbits = 16, \ 843 .storagebits = 16, \ 844 .endianness = IIO_LE, \ 845 }, \ 846 .ext_info = bmg160_ext_info, \ 847 .event_spec = &bmg160_event, \ 848 .num_event_specs = 1 \ 849 } 850 851 static const struct iio_chan_spec bmg160_channels[] = { 852 { 853 .type = IIO_TEMP, 854 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 855 BIT(IIO_CHAN_INFO_SCALE) | 856 BIT(IIO_CHAN_INFO_OFFSET), 857 .scan_index = -1, 858 }, 859 BMG160_CHANNEL(X), 860 BMG160_CHANNEL(Y), 861 BMG160_CHANNEL(Z), 862 IIO_CHAN_SOFT_TIMESTAMP(3), 863 }; 864 865 static const struct iio_info bmg160_info = { 866 .attrs = &bmg160_attrs_group, 867 .read_raw = bmg160_read_raw, 868 .write_raw = bmg160_write_raw, 869 .read_event_value = bmg160_read_event, 870 .write_event_value = bmg160_write_event, 871 .write_event_config = bmg160_write_event_config, 872 .read_event_config = bmg160_read_event_config, 873 }; 874 875 static const unsigned long bmg160_accel_scan_masks[] = { 876 BIT(AXIS_X) | BIT(AXIS_Y) | BIT(AXIS_Z), 877 0}; 878 879 static irqreturn_t bmg160_trigger_handler(int irq, void *p) 880 { 881 struct iio_poll_func *pf = p; 882 struct iio_dev *indio_dev = pf->indio_dev; 883 struct bmg160_data *data = iio_priv(indio_dev); 884 int ret; 885 886 mutex_lock(&data->mutex); 887 ret = regmap_bulk_read(data->regmap, BMG160_REG_XOUT_L, 888 data->scan.chans, AXIS_MAX * 2); 889 mutex_unlock(&data->mutex); 890 if (ret < 0) 891 goto err; 892 893 iio_push_to_buffers_with_timestamp(indio_dev, &data->scan, 894 pf->timestamp); 895 err: 896 iio_trigger_notify_done(indio_dev->trig); 897 898 return IRQ_HANDLED; 899 } 900 901 static void bmg160_trig_reen(struct iio_trigger *trig) 902 { 903 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); 904 struct bmg160_data *data = iio_priv(indio_dev); 905 struct device *dev = regmap_get_device(data->regmap); 906 int ret; 907 908 /* new data interrupts don't need ack */ 909 if (data->dready_trigger_on) 910 return; 911 912 /* Set latched mode interrupt and clear any latched interrupt */ 913 ret = regmap_write(data->regmap, BMG160_REG_INT_RST_LATCH, 914 BMG160_INT_MODE_LATCH_INT | 915 BMG160_INT_MODE_LATCH_RESET); 916 if (ret < 0) 917 dev_err(dev, "Error writing reg_rst_latch\n"); 918 } 919 920 static int bmg160_data_rdy_trigger_set_state(struct iio_trigger *trig, 921 bool state) 922 { 923 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); 924 struct bmg160_data *data = iio_priv(indio_dev); 925 int ret; 926 927 mutex_lock(&data->mutex); 928 929 if (!state && data->ev_enable_state && data->motion_trigger_on) { 930 data->motion_trigger_on = false; 931 mutex_unlock(&data->mutex); 932 return 0; 933 } 934 935 /* 936 * Refer to comment in bmg160_write_event_config for 937 * enable/disable operation order 938 */ 939 ret = bmg160_set_power_state(data, state); 940 if (ret < 0) { 941 mutex_unlock(&data->mutex); 942 return ret; 943 } 944 if (data->motion_trig == trig) 945 ret = bmg160_setup_any_motion_interrupt(data, state); 946 else 947 ret = bmg160_setup_new_data_interrupt(data, state); 948 if (ret < 0) { 949 bmg160_set_power_state(data, false); 950 mutex_unlock(&data->mutex); 951 return ret; 952 } 953 if (data->motion_trig == trig) 954 data->motion_trigger_on = state; 955 else 956 data->dready_trigger_on = state; 957 958 mutex_unlock(&data->mutex); 959 960 return 0; 961 } 962 963 static const struct iio_trigger_ops bmg160_trigger_ops = { 964 .set_trigger_state = bmg160_data_rdy_trigger_set_state, 965 .reenable = bmg160_trig_reen, 966 }; 967 968 static irqreturn_t bmg160_event_handler(int irq, void *private) 969 { 970 struct iio_dev *indio_dev = private; 971 struct bmg160_data *data = iio_priv(indio_dev); 972 struct device *dev = regmap_get_device(data->regmap); 973 int ret; 974 int dir; 975 unsigned int val; 976 977 ret = regmap_read(data->regmap, BMG160_REG_INT_STATUS_2, &val); 978 if (ret < 0) { 979 dev_err(dev, "Error reading reg_int_status2\n"); 980 goto ack_intr_status; 981 } 982 983 if (val & 0x08) 984 dir = IIO_EV_DIR_RISING; 985 else 986 dir = IIO_EV_DIR_FALLING; 987 988 if (val & BMG160_ANY_MOTION_BIT_X) 989 iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ANGL_VEL, 990 0, 991 IIO_MOD_X, 992 IIO_EV_TYPE_ROC, 993 dir), 994 iio_get_time_ns(indio_dev)); 995 if (val & BMG160_ANY_MOTION_BIT_Y) 996 iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ANGL_VEL, 997 0, 998 IIO_MOD_Y, 999 IIO_EV_TYPE_ROC, 1000 dir), 1001 iio_get_time_ns(indio_dev)); 1002 if (val & BMG160_ANY_MOTION_BIT_Z) 1003 iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ANGL_VEL, 1004 0, 1005 IIO_MOD_Z, 1006 IIO_EV_TYPE_ROC, 1007 dir), 1008 iio_get_time_ns(indio_dev)); 1009 1010 ack_intr_status: 1011 if (!data->dready_trigger_on) { 1012 ret = regmap_write(data->regmap, BMG160_REG_INT_RST_LATCH, 1013 BMG160_INT_MODE_LATCH_INT | 1014 BMG160_INT_MODE_LATCH_RESET); 1015 if (ret < 0) 1016 dev_err(dev, "Error writing reg_rst_latch\n"); 1017 } 1018 1019 return IRQ_HANDLED; 1020 } 1021 1022 static irqreturn_t bmg160_data_rdy_trig_poll(int irq, void *private) 1023 { 1024 struct iio_dev *indio_dev = private; 1025 struct bmg160_data *data = iio_priv(indio_dev); 1026 1027 if (data->dready_trigger_on) 1028 iio_trigger_poll(data->dready_trig); 1029 else if (data->motion_trigger_on) 1030 iio_trigger_poll(data->motion_trig); 1031 1032 if (data->ev_enable_state) 1033 return IRQ_WAKE_THREAD; 1034 else 1035 return IRQ_HANDLED; 1036 1037 } 1038 1039 static int bmg160_buffer_preenable(struct iio_dev *indio_dev) 1040 { 1041 struct bmg160_data *data = iio_priv(indio_dev); 1042 1043 return bmg160_set_power_state(data, true); 1044 } 1045 1046 static int bmg160_buffer_postdisable(struct iio_dev *indio_dev) 1047 { 1048 struct bmg160_data *data = iio_priv(indio_dev); 1049 1050 return bmg160_set_power_state(data, false); 1051 } 1052 1053 static const struct iio_buffer_setup_ops bmg160_buffer_setup_ops = { 1054 .preenable = bmg160_buffer_preenable, 1055 .postdisable = bmg160_buffer_postdisable, 1056 }; 1057 1058 static const char *bmg160_match_acpi_device(struct device *dev) 1059 { 1060 const struct acpi_device_id *id; 1061 1062 id = acpi_match_device(dev->driver->acpi_match_table, dev); 1063 if (!id) 1064 return NULL; 1065 1066 return dev_name(dev); 1067 } 1068 1069 int bmg160_core_probe(struct device *dev, struct regmap *regmap, int irq, 1070 const char *name) 1071 { 1072 static const char * const regulators[] = { "vdd", "vddio" }; 1073 struct bmg160_data *data; 1074 struct iio_dev *indio_dev; 1075 int ret; 1076 1077 indio_dev = devm_iio_device_alloc(dev, sizeof(*data)); 1078 if (!indio_dev) 1079 return -ENOMEM; 1080 1081 data = iio_priv(indio_dev); 1082 dev_set_drvdata(dev, indio_dev); 1083 data->irq = irq; 1084 data->regmap = regmap; 1085 1086 ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(regulators), 1087 regulators); 1088 if (ret) 1089 return dev_err_probe(dev, ret, "Failed to get regulators\n"); 1090 1091 ret = iio_read_mount_matrix(dev, &data->orientation); 1092 if (ret) 1093 return ret; 1094 1095 ret = bmg160_chip_init(data); 1096 if (ret < 0) 1097 return ret; 1098 1099 mutex_init(&data->mutex); 1100 1101 if (ACPI_HANDLE(dev)) 1102 name = bmg160_match_acpi_device(dev); 1103 1104 indio_dev->channels = bmg160_channels; 1105 indio_dev->num_channels = ARRAY_SIZE(bmg160_channels); 1106 indio_dev->name = name; 1107 indio_dev->available_scan_masks = bmg160_accel_scan_masks; 1108 indio_dev->modes = INDIO_DIRECT_MODE; 1109 indio_dev->info = &bmg160_info; 1110 1111 if (data->irq > 0) { 1112 ret = devm_request_threaded_irq(dev, 1113 data->irq, 1114 bmg160_data_rdy_trig_poll, 1115 bmg160_event_handler, 1116 IRQF_TRIGGER_RISING, 1117 BMG160_IRQ_NAME, 1118 indio_dev); 1119 if (ret) 1120 return ret; 1121 1122 data->dready_trig = devm_iio_trigger_alloc(dev, 1123 "%s-dev%d", 1124 indio_dev->name, 1125 iio_device_id(indio_dev)); 1126 if (!data->dready_trig) 1127 return -ENOMEM; 1128 1129 data->motion_trig = devm_iio_trigger_alloc(dev, 1130 "%s-any-motion-dev%d", 1131 indio_dev->name, 1132 iio_device_id(indio_dev)); 1133 if (!data->motion_trig) 1134 return -ENOMEM; 1135 1136 data->dready_trig->ops = &bmg160_trigger_ops; 1137 iio_trigger_set_drvdata(data->dready_trig, indio_dev); 1138 ret = iio_trigger_register(data->dready_trig); 1139 if (ret) 1140 return ret; 1141 1142 data->motion_trig->ops = &bmg160_trigger_ops; 1143 iio_trigger_set_drvdata(data->motion_trig, indio_dev); 1144 ret = iio_trigger_register(data->motion_trig); 1145 if (ret) { 1146 data->motion_trig = NULL; 1147 goto err_trigger_unregister; 1148 } 1149 } 1150 1151 ret = iio_triggered_buffer_setup(indio_dev, 1152 iio_pollfunc_store_time, 1153 bmg160_trigger_handler, 1154 &bmg160_buffer_setup_ops); 1155 if (ret < 0) { 1156 dev_err(dev, 1157 "iio triggered buffer setup failed\n"); 1158 goto err_trigger_unregister; 1159 } 1160 1161 ret = pm_runtime_set_active(dev); 1162 if (ret) 1163 goto err_buffer_cleanup; 1164 1165 pm_runtime_enable(dev); 1166 pm_runtime_set_autosuspend_delay(dev, 1167 BMG160_AUTO_SUSPEND_DELAY_MS); 1168 pm_runtime_use_autosuspend(dev); 1169 1170 ret = iio_device_register(indio_dev); 1171 if (ret < 0) { 1172 dev_err(dev, "unable to register iio device\n"); 1173 goto err_pm_cleanup; 1174 } 1175 1176 return 0; 1177 1178 err_pm_cleanup: 1179 pm_runtime_dont_use_autosuspend(dev); 1180 pm_runtime_disable(dev); 1181 err_buffer_cleanup: 1182 iio_triggered_buffer_cleanup(indio_dev); 1183 err_trigger_unregister: 1184 if (data->dready_trig) 1185 iio_trigger_unregister(data->dready_trig); 1186 if (data->motion_trig) 1187 iio_trigger_unregister(data->motion_trig); 1188 1189 return ret; 1190 } 1191 EXPORT_SYMBOL_GPL(bmg160_core_probe); 1192 1193 void bmg160_core_remove(struct device *dev) 1194 { 1195 struct iio_dev *indio_dev = dev_get_drvdata(dev); 1196 struct bmg160_data *data = iio_priv(indio_dev); 1197 1198 iio_device_unregister(indio_dev); 1199 1200 pm_runtime_disable(dev); 1201 pm_runtime_set_suspended(dev); 1202 pm_runtime_put_noidle(dev); 1203 1204 iio_triggered_buffer_cleanup(indio_dev); 1205 1206 if (data->dready_trig) { 1207 iio_trigger_unregister(data->dready_trig); 1208 iio_trigger_unregister(data->motion_trig); 1209 } 1210 1211 mutex_lock(&data->mutex); 1212 bmg160_set_mode(data, BMG160_MODE_DEEP_SUSPEND); 1213 mutex_unlock(&data->mutex); 1214 } 1215 EXPORT_SYMBOL_GPL(bmg160_core_remove); 1216 1217 #ifdef CONFIG_PM_SLEEP 1218 static int bmg160_suspend(struct device *dev) 1219 { 1220 struct iio_dev *indio_dev = dev_get_drvdata(dev); 1221 struct bmg160_data *data = iio_priv(indio_dev); 1222 1223 mutex_lock(&data->mutex); 1224 bmg160_set_mode(data, BMG160_MODE_SUSPEND); 1225 mutex_unlock(&data->mutex); 1226 1227 return 0; 1228 } 1229 1230 static int bmg160_resume(struct device *dev) 1231 { 1232 struct iio_dev *indio_dev = dev_get_drvdata(dev); 1233 struct bmg160_data *data = iio_priv(indio_dev); 1234 1235 mutex_lock(&data->mutex); 1236 if (data->dready_trigger_on || data->motion_trigger_on || 1237 data->ev_enable_state) 1238 bmg160_set_mode(data, BMG160_MODE_NORMAL); 1239 mutex_unlock(&data->mutex); 1240 1241 return 0; 1242 } 1243 #endif 1244 1245 #ifdef CONFIG_PM 1246 static int bmg160_runtime_suspend(struct device *dev) 1247 { 1248 struct iio_dev *indio_dev = dev_get_drvdata(dev); 1249 struct bmg160_data *data = iio_priv(indio_dev); 1250 int ret; 1251 1252 ret = bmg160_set_mode(data, BMG160_MODE_SUSPEND); 1253 if (ret < 0) { 1254 dev_err(dev, "set mode failed\n"); 1255 return -EAGAIN; 1256 } 1257 1258 return 0; 1259 } 1260 1261 static int bmg160_runtime_resume(struct device *dev) 1262 { 1263 struct iio_dev *indio_dev = dev_get_drvdata(dev); 1264 struct bmg160_data *data = iio_priv(indio_dev); 1265 int ret; 1266 1267 ret = bmg160_set_mode(data, BMG160_MODE_NORMAL); 1268 if (ret < 0) 1269 return ret; 1270 1271 msleep_interruptible(BMG160_MAX_STARTUP_TIME_MS); 1272 1273 return 0; 1274 } 1275 #endif 1276 1277 const struct dev_pm_ops bmg160_pm_ops = { 1278 SET_SYSTEM_SLEEP_PM_OPS(bmg160_suspend, bmg160_resume) 1279 SET_RUNTIME_PM_OPS(bmg160_runtime_suspend, 1280 bmg160_runtime_resume, NULL) 1281 }; 1282 EXPORT_SYMBOL_GPL(bmg160_pm_ops); 1283 1284 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"); 1285 MODULE_LICENSE("GPL v2"); 1286 MODULE_DESCRIPTION("BMG160 Gyro driver"); 1287