Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 | /* * Driver for the Asahi Kasei EMD Corporation AK8974 * and Aichi Steel AMI305 magnetometer chips. * Based on a patch from Samu Onkalo and the AK8975 IIO driver. * * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). * Copyright (c) 2010 NVIDIA Corporation. * Copyright (C) 2016 Linaro Ltd. * * Author: Samu Onkalo <samu.p.onkalo@nokia.com> * Author: Linus Walleij <linus.walleij@linaro.org> */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/i2c.h> #include <linux/interrupt.h> #include <linux/irq.h> /* For irq_get_irq_data() */ #include <linux/completion.h> #include <linux/err.h> #include <linux/mutex.h> #include <linux/delay.h> #include <linux/bitops.h> #include <linux/regmap.h> #include <linux/regulator/consumer.h> #include <linux/pm_runtime.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> #include <linux/iio/buffer.h> #include <linux/iio/trigger.h> #include <linux/iio/trigger_consumer.h> #include <linux/iio/triggered_buffer.h> /* * 16-bit registers are little-endian. LSB is at the address defined below * and MSB is at the next higher address. */ /* These registers are common for AK8974 and AMI305 */ #define AK8974_SELFTEST 0x0C #define AK8974_SELFTEST_IDLE 0x55 #define AK8974_SELFTEST_OK 0xAA #define AK8974_INFO 0x0D #define AK8974_WHOAMI 0x0F #define AK8974_WHOAMI_VALUE_AMI305 0x47 #define AK8974_WHOAMI_VALUE_AK8974 0x48 #define AK8974_DATA_X 0x10 #define AK8974_DATA_Y 0x12 #define AK8974_DATA_Z 0x14 #define AK8974_INT_SRC 0x16 #define AK8974_STATUS 0x18 #define AK8974_INT_CLEAR 0x1A #define AK8974_CTRL1 0x1B #define AK8974_CTRL2 0x1C #define AK8974_CTRL3 0x1D #define AK8974_INT_CTRL 0x1E #define AK8974_INT_THRES 0x26 /* Absolute any axis value threshold */ #define AK8974_PRESET 0x30 /* AK8974-specific offsets */ #define AK8974_OFFSET_X 0x20 #define AK8974_OFFSET_Y 0x22 #define AK8974_OFFSET_Z 0x24 /* AMI305-specific offsets */ #define AMI305_OFFSET_X 0x6C #define AMI305_OFFSET_Y 0x72 #define AMI305_OFFSET_Z 0x78 /* Different temperature registers */ #define AK8974_TEMP 0x31 #define AMI305_TEMP 0x60 #define AK8974_INT_X_HIGH BIT(7) /* Axis over +threshold */ #define AK8974_INT_Y_HIGH BIT(6) #define AK8974_INT_Z_HIGH BIT(5) #define AK8974_INT_X_LOW BIT(4) /* Axis below -threshold */ #define AK8974_INT_Y_LOW BIT(3) #define AK8974_INT_Z_LOW BIT(2) #define AK8974_INT_RANGE BIT(1) /* Range overflow (any axis) */ #define AK8974_STATUS_DRDY BIT(6) /* Data ready */ #define AK8974_STATUS_OVERRUN BIT(5) /* Data overrun */ #define AK8974_STATUS_INT BIT(4) /* Interrupt occurred */ #define AK8974_CTRL1_POWER BIT(7) /* 0 = standby; 1 = active */ #define AK8974_CTRL1_RATE BIT(4) /* 0 = 10 Hz; 1 = 20 Hz */ #define AK8974_CTRL1_FORCE_EN BIT(1) /* 0 = normal; 1 = force */ #define AK8974_CTRL1_MODE2 BIT(0) /* 0 */ #define AK8974_CTRL2_INT_EN BIT(4) /* 1 = enable interrupts */ #define AK8974_CTRL2_DRDY_EN BIT(3) /* 1 = enable data ready signal */ #define AK8974_CTRL2_DRDY_POL BIT(2) /* 1 = data ready active high */ #define AK8974_CTRL2_RESDEF (AK8974_CTRL2_DRDY_POL) #define AK8974_CTRL3_RESET BIT(7) /* Software reset */ #define AK8974_CTRL3_FORCE BIT(6) /* Start forced measurement */ #define AK8974_CTRL3_SELFTEST BIT(4) /* Set selftest register */ #define AK8974_CTRL3_RESDEF 0x00 #define AK8974_INT_CTRL_XEN BIT(7) /* Enable interrupt for this axis */ #define AK8974_INT_CTRL_YEN BIT(6) #define AK8974_INT_CTRL_ZEN BIT(5) #define AK8974_INT_CTRL_XYZEN (BIT(7)|BIT(6)|BIT(5)) #define AK8974_INT_CTRL_POL BIT(3) /* 0 = active low; 1 = active high */ #define AK8974_INT_CTRL_PULSE BIT(1) /* 0 = latched; 1 = pulse (50 usec) */ #define AK8974_INT_CTRL_RESDEF (AK8974_INT_CTRL_XYZEN | AK8974_INT_CTRL_POL) /* The AMI305 has elaborate FW version and serial number registers */ #define AMI305_VER 0xE8 #define AMI305_SN 0xEA #define AK8974_MAX_RANGE 2048 #define AK8974_POWERON_DELAY 50 #define AK8974_ACTIVATE_DELAY 1 #define AK8974_SELFTEST_DELAY 1 /* * Set the autosuspend to two orders of magnitude larger than the poweron * delay to make sane reasonable power tradeoff savings (5 seconds in * this case). */ #define AK8974_AUTOSUSPEND_DELAY 5000 #define AK8974_MEASTIME 3 #define AK8974_PWR_ON 1 #define AK8974_PWR_OFF 0 /** * struct ak8974 - state container for the AK8974 driver * @i2c: parent I2C client * @orientation: mounting matrix, flipped axis etc * @map: regmap to access the AK8974 registers over I2C * @regs: the avdd and dvdd power regulators * @name: the name of the part * @variant: the whoami ID value (for selecting code paths) * @lock: locks the magnetometer for exclusive use during a measurement * @drdy_irq: uses the DRDY IRQ line * @drdy_complete: completion for DRDY * @drdy_active_low: the DRDY IRQ is active low */ struct ak8974 { struct i2c_client *i2c; struct iio_mount_matrix orientation; struct regmap *map; struct regulator_bulk_data regs[2]; const char *name; u8 variant; struct mutex lock; bool drdy_irq; struct completion drdy_complete; bool drdy_active_low; }; static const char ak8974_reg_avdd[] = "avdd"; static const char ak8974_reg_dvdd[] = "dvdd"; static int ak8974_set_power(struct ak8974 *ak8974, bool mode) { int ret; u8 val; val = mode ? AK8974_CTRL1_POWER : 0; val |= AK8974_CTRL1_FORCE_EN; ret = regmap_write(ak8974->map, AK8974_CTRL1, val); if (ret < 0) return ret; if (mode) msleep(AK8974_ACTIVATE_DELAY); return 0; } static int ak8974_reset(struct ak8974 *ak8974) { int ret; /* Power on to get register access. Sets CTRL1 reg to reset state */ ret = ak8974_set_power(ak8974, AK8974_PWR_ON); if (ret) return ret; ret = regmap_write(ak8974->map, AK8974_CTRL2, AK8974_CTRL2_RESDEF); if (ret) return ret; ret = regmap_write(ak8974->map, AK8974_CTRL3, AK8974_CTRL3_RESDEF); if (ret) return ret; ret = regmap_write(ak8974->map, AK8974_INT_CTRL, AK8974_INT_CTRL_RESDEF); if (ret) return ret; /* After reset, power off is default state */ return ak8974_set_power(ak8974, AK8974_PWR_OFF); } static int ak8974_configure(struct ak8974 *ak8974) { int ret; ret = regmap_write(ak8974->map, AK8974_CTRL2, AK8974_CTRL2_DRDY_EN | AK8974_CTRL2_INT_EN); if (ret) return ret; ret = regmap_write(ak8974->map, AK8974_CTRL3, 0); if (ret) return ret; ret = regmap_write(ak8974->map, AK8974_INT_CTRL, AK8974_INT_CTRL_POL); if (ret) return ret; return regmap_write(ak8974->map, AK8974_PRESET, 0); } static int ak8974_trigmeas(struct ak8974 *ak8974) { unsigned int clear; u8 mask; u8 val; int ret; /* Clear any previous measurement overflow status */ ret = regmap_read(ak8974->map, AK8974_INT_CLEAR, &clear); if (ret) return ret; /* If we have a DRDY IRQ line, use it */ if (ak8974->drdy_irq) { mask = AK8974_CTRL2_INT_EN | AK8974_CTRL2_DRDY_EN | AK8974_CTRL2_DRDY_POL; val = AK8974_CTRL2_DRDY_EN; if (!ak8974->drdy_active_low) val |= AK8974_CTRL2_DRDY_POL; init_completion(&ak8974->drdy_complete); ret = regmap_update_bits(ak8974->map, AK8974_CTRL2, mask, val); if (ret) return ret; } /* Force a measurement */ return regmap_update_bits(ak8974->map, AK8974_CTRL3, AK8974_CTRL3_FORCE, AK8974_CTRL3_FORCE); } static int ak8974_await_drdy(struct ak8974 *ak8974) { int timeout = 2; unsigned int val; int ret; if (ak8974->drdy_irq) { ret = wait_for_completion_timeout(&ak8974->drdy_complete, 1 + msecs_to_jiffies(1000)); if (!ret) { dev_err(&ak8974->i2c->dev, "timeout waiting for DRDY IRQ\n"); return -ETIMEDOUT; } return 0; } /* Default delay-based poll loop */ do { msleep(AK8974_MEASTIME); ret = regmap_read(ak8974->map, AK8974_STATUS, &val); if (ret < 0) return ret; if (val & AK8974_STATUS_DRDY) return 0; } while (--timeout); if (!timeout) { dev_err(&ak8974->i2c->dev, "timeout waiting for DRDY\n"); return -ETIMEDOUT; } return 0; } static int ak8974_getresult(struct ak8974 *ak8974, s16 *result) { unsigned int src; int ret; ret = ak8974_await_drdy(ak8974); if (ret) return ret; ret = regmap_read(ak8974->map, AK8974_INT_SRC, &src); if (ret < 0) return ret; /* Out of range overflow! Strong magnet close? */ if (src & AK8974_INT_RANGE) { dev_err(&ak8974->i2c->dev, "range overflow in sensor\n"); return -ERANGE; } ret = regmap_bulk_read(ak8974->map, AK8974_DATA_X, result, 6); if (ret) return ret; return ret; } static irqreturn_t ak8974_drdy_irq(int irq, void *d) { struct ak8974 *ak8974 = d; if (!ak8974->drdy_irq) return IRQ_NONE; /* TODO: timestamp here to get good measurement stamps */ return IRQ_WAKE_THREAD; } static irqreturn_t ak8974_drdy_irq_thread(int irq, void *d) { struct ak8974 *ak8974 = d; unsigned int val; int ret; /* Check if this was a DRDY from us */ ret = regmap_read(ak8974->map, AK8974_STATUS, &val); if (ret < 0) { dev_err(&ak8974->i2c->dev, "error reading DRDY status\n"); return IRQ_HANDLED; } if (val & AK8974_STATUS_DRDY) { /* Yes this was our IRQ */ complete(&ak8974->drdy_complete); return IRQ_HANDLED; } /* We may be on a shared IRQ, let the next client check */ return IRQ_NONE; } static int ak8974_selftest(struct ak8974 *ak8974) { struct device *dev = &ak8974->i2c->dev; unsigned int val; int ret; ret = regmap_read(ak8974->map, AK8974_SELFTEST, &val); if (ret) return ret; if (val != AK8974_SELFTEST_IDLE) { dev_err(dev, "selftest not idle before test\n"); return -EIO; } /* Trigger self-test */ ret = regmap_update_bits(ak8974->map, AK8974_CTRL3, AK8974_CTRL3_SELFTEST, AK8974_CTRL3_SELFTEST); if (ret) { dev_err(dev, "could not write CTRL3\n"); return ret; } msleep(AK8974_SELFTEST_DELAY); ret = regmap_read(ak8974->map, AK8974_SELFTEST, &val); if (ret) return ret; if (val != AK8974_SELFTEST_OK) { dev_err(dev, "selftest result NOT OK (%02x)\n", val); return -EIO; } ret = regmap_read(ak8974->map, AK8974_SELFTEST, &val); if (ret) return ret; if (val != AK8974_SELFTEST_IDLE) { dev_err(dev, "selftest not idle after test (%02x)\n", val); return -EIO; } dev_dbg(dev, "passed self-test\n"); return 0; } static int ak8974_get_u16_val(struct ak8974 *ak8974, u8 reg, u16 *val) { int ret; u16 bulk; ret = regmap_bulk_read(ak8974->map, reg, &bulk, 2); if (ret) return ret; *val = le16_to_cpu(bulk); return 0; } static int ak8974_detect(struct ak8974 *ak8974) { unsigned int whoami; const char *name; int ret; unsigned int fw; u16 sn; ret = regmap_read(ak8974->map, AK8974_WHOAMI, &whoami); if (ret) return ret; switch (whoami) { case AK8974_WHOAMI_VALUE_AMI305: name = "ami305"; ret = regmap_read(ak8974->map, AMI305_VER, &fw); if (ret) return ret; fw &= 0x7f; /* only bits 0 thru 6 valid */ ret = ak8974_get_u16_val(ak8974, AMI305_SN, &sn); if (ret) return ret; dev_info(&ak8974->i2c->dev, "detected %s, FW ver %02x, S/N: %04x\n", name, fw, sn); break; case AK8974_WHOAMI_VALUE_AK8974: name = "ak8974"; dev_info(&ak8974->i2c->dev, "detected AK8974\n"); break; default: dev_err(&ak8974->i2c->dev, "unsupported device (%02x) ", whoami); return -ENODEV; } ak8974->name = name; ak8974->variant = whoami; return 0; } static int ak8974_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { struct ak8974 *ak8974 = iio_priv(indio_dev); s16 hw_values[3]; int ret = -EINVAL; pm_runtime_get_sync(&ak8974->i2c->dev); mutex_lock(&ak8974->lock); switch (mask) { case IIO_CHAN_INFO_RAW: if (chan->address > 2) { dev_err(&ak8974->i2c->dev, "faulty channel address\n"); ret = -EIO; goto out_unlock; } ret = ak8974_trigmeas(ak8974); if (ret) goto out_unlock; ret = ak8974_getresult(ak8974, hw_values); if (ret) goto out_unlock; /* * We read all axes and discard all but one, for optimized * reading, use the triggered buffer. */ *val = le16_to_cpu(hw_values[chan->address]); ret = IIO_VAL_INT; } out_unlock: mutex_unlock(&ak8974->lock); pm_runtime_mark_last_busy(&ak8974->i2c->dev); pm_runtime_put_autosuspend(&ak8974->i2c->dev); return ret; } static void ak8974_fill_buffer(struct iio_dev *indio_dev) { struct ak8974 *ak8974 = iio_priv(indio_dev); int ret; s16 hw_values[8]; /* Three axes + 64bit padding */ pm_runtime_get_sync(&ak8974->i2c->dev); mutex_lock(&ak8974->lock); ret = ak8974_trigmeas(ak8974); if (ret) { dev_err(&ak8974->i2c->dev, "error triggering measure\n"); goto out_unlock; } ret = ak8974_getresult(ak8974, hw_values); if (ret) { dev_err(&ak8974->i2c->dev, "error getting measures\n"); goto out_unlock; } iio_push_to_buffers_with_timestamp(indio_dev, hw_values, iio_get_time_ns(indio_dev)); out_unlock: mutex_unlock(&ak8974->lock); pm_runtime_mark_last_busy(&ak8974->i2c->dev); pm_runtime_put_autosuspend(&ak8974->i2c->dev); } static irqreturn_t ak8974_handle_trigger(int irq, void *p) { const struct iio_poll_func *pf = p; struct iio_dev *indio_dev = pf->indio_dev; ak8974_fill_buffer(indio_dev); iio_trigger_notify_done(indio_dev->trig); return IRQ_HANDLED; } static const struct iio_mount_matrix * ak8974_get_mount_matrix(const struct iio_dev *indio_dev, const struct iio_chan_spec *chan) { struct ak8974 *ak8974 = iio_priv(indio_dev); return &ak8974->orientation; } static const struct iio_chan_spec_ext_info ak8974_ext_info[] = { IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, ak8974_get_mount_matrix), { }, }; #define AK8974_AXIS_CHANNEL(axis, index) \ { \ .type = IIO_MAGN, \ .modified = 1, \ .channel2 = IIO_MOD_##axis, \ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ .ext_info = ak8974_ext_info, \ .address = index, \ .scan_index = index, \ .scan_type = { \ .sign = 's', \ .realbits = 16, \ .storagebits = 16, \ .endianness = IIO_LE \ }, \ } static const struct iio_chan_spec ak8974_channels[] = { AK8974_AXIS_CHANNEL(X, 0), AK8974_AXIS_CHANNEL(Y, 1), AK8974_AXIS_CHANNEL(Z, 2), IIO_CHAN_SOFT_TIMESTAMP(3), }; static const unsigned long ak8974_scan_masks[] = { 0x7, 0 }; static const struct iio_info ak8974_info = { .read_raw = &ak8974_read_raw, .driver_module = THIS_MODULE, }; static bool ak8974_writeable_reg(struct device *dev, unsigned int reg) { struct i2c_client *i2c = to_i2c_client(dev); struct iio_dev *indio_dev = i2c_get_clientdata(i2c); struct ak8974 *ak8974 = iio_priv(indio_dev); switch (reg) { case AK8974_CTRL1: case AK8974_CTRL2: case AK8974_CTRL3: case AK8974_INT_CTRL: case AK8974_INT_THRES: case AK8974_INT_THRES + 1: case AK8974_PRESET: case AK8974_PRESET + 1: return true; case AK8974_OFFSET_X: case AK8974_OFFSET_X + 1: case AK8974_OFFSET_Y: case AK8974_OFFSET_Y + 1: case AK8974_OFFSET_Z: case AK8974_OFFSET_Z + 1: if (ak8974->variant == AK8974_WHOAMI_VALUE_AK8974) return true; return false; case AMI305_OFFSET_X: case AMI305_OFFSET_X + 1: case AMI305_OFFSET_Y: case AMI305_OFFSET_Y + 1: case AMI305_OFFSET_Z: case AMI305_OFFSET_Z + 1: if (ak8974->variant == AK8974_WHOAMI_VALUE_AMI305) return true; return false; default: return false; } } static const struct regmap_config ak8974_regmap_config = { .reg_bits = 8, .val_bits = 8, .max_register = 0xff, .writeable_reg = ak8974_writeable_reg, }; static int ak8974_probe(struct i2c_client *i2c, const struct i2c_device_id *id) { struct iio_dev *indio_dev; struct ak8974 *ak8974; unsigned long irq_trig; int irq = i2c->irq; int ret; /* Register with IIO */ indio_dev = devm_iio_device_alloc(&i2c->dev, sizeof(*ak8974)); if (indio_dev == NULL) return -ENOMEM; ak8974 = iio_priv(indio_dev); i2c_set_clientdata(i2c, indio_dev); ak8974->i2c = i2c; mutex_init(&ak8974->lock); ret = of_iio_read_mount_matrix(&i2c->dev, "mount-matrix", &ak8974->orientation); if (ret) return ret; ak8974->regs[0].supply = ak8974_reg_avdd; ak8974->regs[1].supply = ak8974_reg_dvdd; ret = devm_regulator_bulk_get(&i2c->dev, ARRAY_SIZE(ak8974->regs), ak8974->regs); if (ret < 0) { dev_err(&i2c->dev, "cannot get regulators\n"); return ret; } ret = regulator_bulk_enable(ARRAY_SIZE(ak8974->regs), ak8974->regs); if (ret < 0) { dev_err(&i2c->dev, "cannot enable regulators\n"); return ret; } /* Take runtime PM online */ pm_runtime_get_noresume(&i2c->dev); pm_runtime_set_active(&i2c->dev); pm_runtime_enable(&i2c->dev); ak8974->map = devm_regmap_init_i2c(i2c, &ak8974_regmap_config); if (IS_ERR(ak8974->map)) { dev_err(&i2c->dev, "failed to allocate register map\n"); return PTR_ERR(ak8974->map); } ret = ak8974_set_power(ak8974, AK8974_PWR_ON); if (ret) { dev_err(&i2c->dev, "could not power on\n"); goto power_off; } ret = ak8974_detect(ak8974); if (ret) { dev_err(&i2c->dev, "neither AK8974 nor AMI305 found\n"); goto power_off; } ret = ak8974_selftest(ak8974); if (ret) dev_err(&i2c->dev, "selftest failed (continuing anyway)\n"); ret = ak8974_reset(ak8974); if (ret) { dev_err(&i2c->dev, "AK8974 reset failed\n"); goto power_off; } pm_runtime_set_autosuspend_delay(&i2c->dev, AK8974_AUTOSUSPEND_DELAY); pm_runtime_use_autosuspend(&i2c->dev); pm_runtime_put(&i2c->dev); indio_dev->dev.parent = &i2c->dev; indio_dev->channels = ak8974_channels; indio_dev->num_channels = ARRAY_SIZE(ak8974_channels); indio_dev->info = &ak8974_info; indio_dev->available_scan_masks = ak8974_scan_masks; indio_dev->modes = INDIO_DIRECT_MODE; indio_dev->name = ak8974->name; ret = iio_triggered_buffer_setup(indio_dev, NULL, ak8974_handle_trigger, NULL); if (ret) { dev_err(&i2c->dev, "triggered buffer setup failed\n"); goto disable_pm; } /* If we have a valid DRDY IRQ, make use of it */ if (irq > 0) { irq_trig = irqd_get_trigger_type(irq_get_irq_data(irq)); if (irq_trig == IRQF_TRIGGER_RISING) { dev_info(&i2c->dev, "enable rising edge DRDY IRQ\n"); } else if (irq_trig == IRQF_TRIGGER_FALLING) { ak8974->drdy_active_low = true; dev_info(&i2c->dev, "enable falling edge DRDY IRQ\n"); } else { irq_trig = IRQF_TRIGGER_RISING; } irq_trig |= IRQF_ONESHOT; irq_trig |= IRQF_SHARED; ret = devm_request_threaded_irq(&i2c->dev, irq, ak8974_drdy_irq, ak8974_drdy_irq_thread, irq_trig, ak8974->name, ak8974); if (ret) { dev_err(&i2c->dev, "unable to request DRDY IRQ " "- proceeding without IRQ\n"); goto no_irq; } ak8974->drdy_irq = true; } no_irq: ret = iio_device_register(indio_dev); if (ret) { dev_err(&i2c->dev, "device register failed\n"); goto cleanup_buffer; } return 0; cleanup_buffer: iio_triggered_buffer_cleanup(indio_dev); disable_pm: pm_runtime_put_noidle(&i2c->dev); pm_runtime_disable(&i2c->dev); ak8974_set_power(ak8974, AK8974_PWR_OFF); power_off: regulator_bulk_disable(ARRAY_SIZE(ak8974->regs), ak8974->regs); return ret; } static int __exit ak8974_remove(struct i2c_client *i2c) { struct iio_dev *indio_dev = i2c_get_clientdata(i2c); struct ak8974 *ak8974 = iio_priv(indio_dev); iio_device_unregister(indio_dev); iio_triggered_buffer_cleanup(indio_dev); pm_runtime_get_sync(&i2c->dev); pm_runtime_put_noidle(&i2c->dev); pm_runtime_disable(&i2c->dev); ak8974_set_power(ak8974, AK8974_PWR_OFF); regulator_bulk_disable(ARRAY_SIZE(ak8974->regs), ak8974->regs); return 0; } static int __maybe_unused ak8974_runtime_suspend(struct device *dev) { struct ak8974 *ak8974 = iio_priv(i2c_get_clientdata(to_i2c_client(dev))); ak8974_set_power(ak8974, AK8974_PWR_OFF); regulator_bulk_disable(ARRAY_SIZE(ak8974->regs), ak8974->regs); return 0; } static int __maybe_unused ak8974_runtime_resume(struct device *dev) { struct ak8974 *ak8974 = iio_priv(i2c_get_clientdata(to_i2c_client(dev))); int ret; ret = regulator_bulk_enable(ARRAY_SIZE(ak8974->regs), ak8974->regs); if (ret) return ret; msleep(AK8974_POWERON_DELAY); ret = ak8974_set_power(ak8974, AK8974_PWR_ON); if (ret) goto out_regulator_disable; ret = ak8974_configure(ak8974); if (ret) goto out_disable_power; return 0; out_disable_power: ak8974_set_power(ak8974, AK8974_PWR_OFF); out_regulator_disable: regulator_bulk_disable(ARRAY_SIZE(ak8974->regs), ak8974->regs); return ret; } static const struct dev_pm_ops ak8974_dev_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, pm_runtime_force_resume) SET_RUNTIME_PM_OPS(ak8974_runtime_suspend, ak8974_runtime_resume, NULL) }; static const struct i2c_device_id ak8974_id[] = { {"ami305", 0 }, {"ak8974", 0 }, {} }; MODULE_DEVICE_TABLE(i2c, ak8974_id); static const struct of_device_id ak8974_of_match[] = { { .compatible = "asahi-kasei,ak8974", }, {} }; MODULE_DEVICE_TABLE(of, ak8974_of_match); static struct i2c_driver ak8974_driver = { .driver = { .name = "ak8974", .pm = &ak8974_dev_pm_ops, .of_match_table = of_match_ptr(ak8974_of_match), }, .probe = ak8974_probe, .remove = __exit_p(ak8974_remove), .id_table = ak8974_id, }; module_i2c_driver(ak8974_driver); MODULE_DESCRIPTION("AK8974 and AMI305 3-axis magnetometer driver"); MODULE_AUTHOR("Samu Onkalo"); MODULE_AUTHOR("Linus Walleij"); MODULE_LICENSE("GPL v2"); |