1 /* 2 * lm3533-als.c -- LM3533 Ambient Light Sensor driver 3 * 4 * Copyright (C) 2011-2012 Texas Instruments 5 * 6 * Author: Johan Hovold <jhovold@gmail.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 */ 13 14 #include <linux/atomic.h> 15 #include <linux/fs.h> 16 #include <linux/interrupt.h> 17 #include <linux/io.h> 18 #include <linux/iio/events.h> 19 #include <linux/iio/iio.h> 20 #include <linux/module.h> 21 #include <linux/mutex.h> 22 #include <linux/mfd/core.h> 23 #include <linux/platform_device.h> 24 #include <linux/slab.h> 25 #include <linux/uaccess.h> 26 27 #include <linux/mfd/lm3533.h> 28 29 30 #define LM3533_ALS_RESISTOR_MIN 1 31 #define LM3533_ALS_RESISTOR_MAX 127 32 #define LM3533_ALS_CHANNEL_CURRENT_MAX 2 33 #define LM3533_ALS_THRESH_MAX 3 34 #define LM3533_ALS_ZONE_MAX 4 35 36 #define LM3533_REG_ALS_RESISTOR_SELECT 0x30 37 #define LM3533_REG_ALS_CONF 0x31 38 #define LM3533_REG_ALS_ZONE_INFO 0x34 39 #define LM3533_REG_ALS_READ_ADC_RAW 0x37 40 #define LM3533_REG_ALS_READ_ADC_AVERAGE 0x38 41 #define LM3533_REG_ALS_BOUNDARY_BASE 0x50 42 #define LM3533_REG_ALS_TARGET_BASE 0x60 43 44 #define LM3533_ALS_ENABLE_MASK 0x01 45 #define LM3533_ALS_INPUT_MODE_MASK 0x02 46 #define LM3533_ALS_INT_ENABLE_MASK 0x01 47 48 #define LM3533_ALS_ZONE_SHIFT 2 49 #define LM3533_ALS_ZONE_MASK 0x1c 50 51 #define LM3533_ALS_FLAG_INT_ENABLED 1 52 53 54 struct lm3533_als { 55 struct lm3533 *lm3533; 56 struct platform_device *pdev; 57 58 unsigned long flags; 59 int irq; 60 61 atomic_t zone; 62 struct mutex thresh_mutex; 63 }; 64 65 66 static int lm3533_als_get_adc(struct iio_dev *indio_dev, bool average, 67 int *adc) 68 { 69 struct lm3533_als *als = iio_priv(indio_dev); 70 u8 reg; 71 u8 val; 72 int ret; 73 74 if (average) 75 reg = LM3533_REG_ALS_READ_ADC_AVERAGE; 76 else 77 reg = LM3533_REG_ALS_READ_ADC_RAW; 78 79 ret = lm3533_read(als->lm3533, reg, &val); 80 if (ret) { 81 dev_err(&indio_dev->dev, "failed to read adc\n"); 82 return ret; 83 } 84 85 *adc = val; 86 87 return 0; 88 } 89 90 static int _lm3533_als_get_zone(struct iio_dev *indio_dev, u8 *zone) 91 { 92 struct lm3533_als *als = iio_priv(indio_dev); 93 u8 val; 94 int ret; 95 96 ret = lm3533_read(als->lm3533, LM3533_REG_ALS_ZONE_INFO, &val); 97 if (ret) { 98 dev_err(&indio_dev->dev, "failed to read zone\n"); 99 return ret; 100 } 101 102 val = (val & LM3533_ALS_ZONE_MASK) >> LM3533_ALS_ZONE_SHIFT; 103 *zone = min_t(u8, val, LM3533_ALS_ZONE_MAX); 104 105 return 0; 106 } 107 108 static int lm3533_als_get_zone(struct iio_dev *indio_dev, u8 *zone) 109 { 110 struct lm3533_als *als = iio_priv(indio_dev); 111 int ret; 112 113 if (test_bit(LM3533_ALS_FLAG_INT_ENABLED, &als->flags)) { 114 *zone = atomic_read(&als->zone); 115 } else { 116 ret = _lm3533_als_get_zone(indio_dev, zone); 117 if (ret) 118 return ret; 119 } 120 121 return 0; 122 } 123 124 /* 125 * channel output channel 0..2 126 * zone zone 0..4 127 */ 128 static inline u8 lm3533_als_get_target_reg(unsigned channel, unsigned zone) 129 { 130 return LM3533_REG_ALS_TARGET_BASE + 5 * channel + zone; 131 } 132 133 static int lm3533_als_get_target(struct iio_dev *indio_dev, unsigned channel, 134 unsigned zone, u8 *val) 135 { 136 struct lm3533_als *als = iio_priv(indio_dev); 137 u8 reg; 138 int ret; 139 140 if (channel > LM3533_ALS_CHANNEL_CURRENT_MAX) 141 return -EINVAL; 142 143 if (zone > LM3533_ALS_ZONE_MAX) 144 return -EINVAL; 145 146 reg = lm3533_als_get_target_reg(channel, zone); 147 ret = lm3533_read(als->lm3533, reg, val); 148 if (ret) 149 dev_err(&indio_dev->dev, "failed to get target current\n"); 150 151 return ret; 152 } 153 154 static int lm3533_als_set_target(struct iio_dev *indio_dev, unsigned channel, 155 unsigned zone, u8 val) 156 { 157 struct lm3533_als *als = iio_priv(indio_dev); 158 u8 reg; 159 int ret; 160 161 if (channel > LM3533_ALS_CHANNEL_CURRENT_MAX) 162 return -EINVAL; 163 164 if (zone > LM3533_ALS_ZONE_MAX) 165 return -EINVAL; 166 167 reg = lm3533_als_get_target_reg(channel, zone); 168 ret = lm3533_write(als->lm3533, reg, val); 169 if (ret) 170 dev_err(&indio_dev->dev, "failed to set target current\n"); 171 172 return ret; 173 } 174 175 static int lm3533_als_get_current(struct iio_dev *indio_dev, unsigned channel, 176 int *val) 177 { 178 u8 zone; 179 u8 target; 180 int ret; 181 182 ret = lm3533_als_get_zone(indio_dev, &zone); 183 if (ret) 184 return ret; 185 186 ret = lm3533_als_get_target(indio_dev, channel, zone, &target); 187 if (ret) 188 return ret; 189 190 *val = target; 191 192 return 0; 193 } 194 195 static int lm3533_als_read_raw(struct iio_dev *indio_dev, 196 struct iio_chan_spec const *chan, 197 int *val, int *val2, long mask) 198 { 199 int ret; 200 201 switch (mask) { 202 case 0: 203 switch (chan->type) { 204 case IIO_LIGHT: 205 ret = lm3533_als_get_adc(indio_dev, false, val); 206 break; 207 case IIO_CURRENT: 208 ret = lm3533_als_get_current(indio_dev, chan->channel, 209 val); 210 break; 211 default: 212 return -EINVAL; 213 } 214 break; 215 case IIO_CHAN_INFO_AVERAGE_RAW: 216 ret = lm3533_als_get_adc(indio_dev, true, val); 217 break; 218 default: 219 return -EINVAL; 220 } 221 222 if (ret) 223 return ret; 224 225 return IIO_VAL_INT; 226 } 227 228 #define CHANNEL_CURRENT(_channel) \ 229 { \ 230 .type = IIO_CURRENT, \ 231 .channel = _channel, \ 232 .indexed = true, \ 233 .output = true, \ 234 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ 235 } 236 237 static const struct iio_chan_spec lm3533_als_channels[] = { 238 { 239 .type = IIO_LIGHT, 240 .channel = 0, 241 .indexed = true, 242 .info_mask_separate = BIT(IIO_CHAN_INFO_AVERAGE_RAW) | 243 BIT(IIO_CHAN_INFO_RAW), 244 }, 245 CHANNEL_CURRENT(0), 246 CHANNEL_CURRENT(1), 247 CHANNEL_CURRENT(2), 248 }; 249 250 static irqreturn_t lm3533_als_isr(int irq, void *dev_id) 251 { 252 253 struct iio_dev *indio_dev = dev_id; 254 struct lm3533_als *als = iio_priv(indio_dev); 255 u8 zone; 256 int ret; 257 258 /* Clear interrupt by reading the ALS zone register. */ 259 ret = _lm3533_als_get_zone(indio_dev, &zone); 260 if (ret) 261 goto out; 262 263 atomic_set(&als->zone, zone); 264 265 iio_push_event(indio_dev, 266 IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 267 0, 268 IIO_EV_TYPE_THRESH, 269 IIO_EV_DIR_EITHER), 270 iio_get_time_ns()); 271 out: 272 return IRQ_HANDLED; 273 } 274 275 static int lm3533_als_set_int_mode(struct iio_dev *indio_dev, int enable) 276 { 277 struct lm3533_als *als = iio_priv(indio_dev); 278 u8 mask = LM3533_ALS_INT_ENABLE_MASK; 279 u8 val; 280 int ret; 281 282 if (enable) 283 val = mask; 284 else 285 val = 0; 286 287 ret = lm3533_update(als->lm3533, LM3533_REG_ALS_ZONE_INFO, val, mask); 288 if (ret) { 289 dev_err(&indio_dev->dev, "failed to set int mode %d\n", 290 enable); 291 return ret; 292 } 293 294 return 0; 295 } 296 297 static int lm3533_als_get_int_mode(struct iio_dev *indio_dev, int *enable) 298 { 299 struct lm3533_als *als = iio_priv(indio_dev); 300 u8 mask = LM3533_ALS_INT_ENABLE_MASK; 301 u8 val; 302 int ret; 303 304 ret = lm3533_read(als->lm3533, LM3533_REG_ALS_ZONE_INFO, &val); 305 if (ret) { 306 dev_err(&indio_dev->dev, "failed to get int mode\n"); 307 return ret; 308 } 309 310 *enable = !!(val & mask); 311 312 return 0; 313 } 314 315 static inline u8 lm3533_als_get_threshold_reg(unsigned nr, bool raising) 316 { 317 u8 offset = !raising; 318 319 return LM3533_REG_ALS_BOUNDARY_BASE + 2 * nr + offset; 320 } 321 322 static int lm3533_als_get_threshold(struct iio_dev *indio_dev, unsigned nr, 323 bool raising, u8 *val) 324 { 325 struct lm3533_als *als = iio_priv(indio_dev); 326 u8 reg; 327 int ret; 328 329 if (nr > LM3533_ALS_THRESH_MAX) 330 return -EINVAL; 331 332 reg = lm3533_als_get_threshold_reg(nr, raising); 333 ret = lm3533_read(als->lm3533, reg, val); 334 if (ret) 335 dev_err(&indio_dev->dev, "failed to get threshold\n"); 336 337 return ret; 338 } 339 340 static int lm3533_als_set_threshold(struct iio_dev *indio_dev, unsigned nr, 341 bool raising, u8 val) 342 { 343 struct lm3533_als *als = iio_priv(indio_dev); 344 u8 val2; 345 u8 reg, reg2; 346 int ret; 347 348 if (nr > LM3533_ALS_THRESH_MAX) 349 return -EINVAL; 350 351 reg = lm3533_als_get_threshold_reg(nr, raising); 352 reg2 = lm3533_als_get_threshold_reg(nr, !raising); 353 354 mutex_lock(&als->thresh_mutex); 355 ret = lm3533_read(als->lm3533, reg2, &val2); 356 if (ret) { 357 dev_err(&indio_dev->dev, "failed to get threshold\n"); 358 goto out; 359 } 360 /* 361 * This device does not allow negative hysteresis (in fact, it uses 362 * whichever value is smaller as the lower bound) so we need to make 363 * sure that thresh_falling <= thresh_raising. 364 */ 365 if ((raising && (val < val2)) || (!raising && (val > val2))) { 366 ret = -EINVAL; 367 goto out; 368 } 369 370 ret = lm3533_write(als->lm3533, reg, val); 371 if (ret) { 372 dev_err(&indio_dev->dev, "failed to set threshold\n"); 373 goto out; 374 } 375 out: 376 mutex_unlock(&als->thresh_mutex); 377 378 return ret; 379 } 380 381 static int lm3533_als_get_hysteresis(struct iio_dev *indio_dev, unsigned nr, 382 u8 *val) 383 { 384 struct lm3533_als *als = iio_priv(indio_dev); 385 u8 falling; 386 u8 raising; 387 int ret; 388 389 if (nr > LM3533_ALS_THRESH_MAX) 390 return -EINVAL; 391 392 mutex_lock(&als->thresh_mutex); 393 ret = lm3533_als_get_threshold(indio_dev, nr, false, &falling); 394 if (ret) 395 goto out; 396 ret = lm3533_als_get_threshold(indio_dev, nr, true, &raising); 397 if (ret) 398 goto out; 399 400 *val = raising - falling; 401 out: 402 mutex_unlock(&als->thresh_mutex); 403 404 return ret; 405 } 406 407 static ssize_t show_thresh_either_en(struct device *dev, 408 struct device_attribute *attr, 409 char *buf) 410 { 411 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 412 struct lm3533_als *als = iio_priv(indio_dev); 413 int enable; 414 int ret; 415 416 if (als->irq) { 417 ret = lm3533_als_get_int_mode(indio_dev, &enable); 418 if (ret) 419 return ret; 420 } else { 421 enable = 0; 422 } 423 424 return scnprintf(buf, PAGE_SIZE, "%u\n", enable); 425 } 426 427 static ssize_t store_thresh_either_en(struct device *dev, 428 struct device_attribute *attr, 429 const char *buf, size_t len) 430 { 431 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 432 struct lm3533_als *als = iio_priv(indio_dev); 433 unsigned long enable; 434 bool int_enabled; 435 u8 zone; 436 int ret; 437 438 if (!als->irq) 439 return -EBUSY; 440 441 if (kstrtoul(buf, 0, &enable)) 442 return -EINVAL; 443 444 int_enabled = test_bit(LM3533_ALS_FLAG_INT_ENABLED, &als->flags); 445 446 if (enable && !int_enabled) { 447 ret = lm3533_als_get_zone(indio_dev, &zone); 448 if (ret) 449 return ret; 450 451 atomic_set(&als->zone, zone); 452 453 set_bit(LM3533_ALS_FLAG_INT_ENABLED, &als->flags); 454 } 455 456 ret = lm3533_als_set_int_mode(indio_dev, enable); 457 if (ret) { 458 if (!int_enabled) 459 clear_bit(LM3533_ALS_FLAG_INT_ENABLED, &als->flags); 460 461 return ret; 462 } 463 464 if (!enable) 465 clear_bit(LM3533_ALS_FLAG_INT_ENABLED, &als->flags); 466 467 return len; 468 } 469 470 static ssize_t show_zone(struct device *dev, 471 struct device_attribute *attr, char *buf) 472 { 473 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 474 u8 zone; 475 int ret; 476 477 ret = lm3533_als_get_zone(indio_dev, &zone); 478 if (ret) 479 return ret; 480 481 return scnprintf(buf, PAGE_SIZE, "%u\n", zone); 482 } 483 484 enum lm3533_als_attribute_type { 485 LM3533_ATTR_TYPE_HYSTERESIS, 486 LM3533_ATTR_TYPE_TARGET, 487 LM3533_ATTR_TYPE_THRESH_FALLING, 488 LM3533_ATTR_TYPE_THRESH_RAISING, 489 }; 490 491 struct lm3533_als_attribute { 492 struct device_attribute dev_attr; 493 enum lm3533_als_attribute_type type; 494 u8 val1; 495 u8 val2; 496 }; 497 498 static inline struct lm3533_als_attribute * 499 to_lm3533_als_attr(struct device_attribute *attr) 500 { 501 return container_of(attr, struct lm3533_als_attribute, dev_attr); 502 } 503 504 static ssize_t show_als_attr(struct device *dev, 505 struct device_attribute *attr, 506 char *buf) 507 { 508 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 509 struct lm3533_als_attribute *als_attr = to_lm3533_als_attr(attr); 510 u8 val; 511 int ret; 512 513 switch (als_attr->type) { 514 case LM3533_ATTR_TYPE_HYSTERESIS: 515 ret = lm3533_als_get_hysteresis(indio_dev, als_attr->val1, 516 &val); 517 break; 518 case LM3533_ATTR_TYPE_TARGET: 519 ret = lm3533_als_get_target(indio_dev, als_attr->val1, 520 als_attr->val2, &val); 521 break; 522 case LM3533_ATTR_TYPE_THRESH_FALLING: 523 ret = lm3533_als_get_threshold(indio_dev, als_attr->val1, 524 false, &val); 525 break; 526 case LM3533_ATTR_TYPE_THRESH_RAISING: 527 ret = lm3533_als_get_threshold(indio_dev, als_attr->val1, 528 true, &val); 529 break; 530 default: 531 ret = -ENXIO; 532 } 533 534 if (ret) 535 return ret; 536 537 return scnprintf(buf, PAGE_SIZE, "%u\n", val); 538 } 539 540 static ssize_t store_als_attr(struct device *dev, 541 struct device_attribute *attr, 542 const char *buf, size_t len) 543 { 544 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 545 struct lm3533_als_attribute *als_attr = to_lm3533_als_attr(attr); 546 u8 val; 547 int ret; 548 549 if (kstrtou8(buf, 0, &val)) 550 return -EINVAL; 551 552 switch (als_attr->type) { 553 case LM3533_ATTR_TYPE_TARGET: 554 ret = lm3533_als_set_target(indio_dev, als_attr->val1, 555 als_attr->val2, val); 556 break; 557 case LM3533_ATTR_TYPE_THRESH_FALLING: 558 ret = lm3533_als_set_threshold(indio_dev, als_attr->val1, 559 false, val); 560 break; 561 case LM3533_ATTR_TYPE_THRESH_RAISING: 562 ret = lm3533_als_set_threshold(indio_dev, als_attr->val1, 563 true, val); 564 break; 565 default: 566 ret = -ENXIO; 567 } 568 569 if (ret) 570 return ret; 571 572 return len; 573 } 574 575 #define ALS_ATTR(_name, _mode, _show, _store, _type, _val1, _val2) \ 576 { .dev_attr = __ATTR(_name, _mode, _show, _store), \ 577 .type = _type, \ 578 .val1 = _val1, \ 579 .val2 = _val2 } 580 581 #define LM3533_ALS_ATTR(_name, _mode, _show, _store, _type, _val1, _val2) \ 582 struct lm3533_als_attribute lm3533_als_attr_##_name = \ 583 ALS_ATTR(_name, _mode, _show, _store, _type, _val1, _val2) 584 585 #define ALS_TARGET_ATTR_RW(_channel, _zone) \ 586 LM3533_ALS_ATTR(out_current##_channel##_current##_zone##_raw, \ 587 S_IRUGO | S_IWUSR, \ 588 show_als_attr, store_als_attr, \ 589 LM3533_ATTR_TYPE_TARGET, _channel, _zone) 590 /* 591 * ALS output current values (ALS mapper targets) 592 * 593 * out_current[0-2]_current[0-4]_raw 0-255 594 */ 595 static ALS_TARGET_ATTR_RW(0, 0); 596 static ALS_TARGET_ATTR_RW(0, 1); 597 static ALS_TARGET_ATTR_RW(0, 2); 598 static ALS_TARGET_ATTR_RW(0, 3); 599 static ALS_TARGET_ATTR_RW(0, 4); 600 601 static ALS_TARGET_ATTR_RW(1, 0); 602 static ALS_TARGET_ATTR_RW(1, 1); 603 static ALS_TARGET_ATTR_RW(1, 2); 604 static ALS_TARGET_ATTR_RW(1, 3); 605 static ALS_TARGET_ATTR_RW(1, 4); 606 607 static ALS_TARGET_ATTR_RW(2, 0); 608 static ALS_TARGET_ATTR_RW(2, 1); 609 static ALS_TARGET_ATTR_RW(2, 2); 610 static ALS_TARGET_ATTR_RW(2, 3); 611 static ALS_TARGET_ATTR_RW(2, 4); 612 613 #define ALS_THRESH_FALLING_ATTR_RW(_nr) \ 614 LM3533_ALS_ATTR(in_illuminance0_thresh##_nr##_falling_value, \ 615 S_IRUGO | S_IWUSR, \ 616 show_als_attr, store_als_attr, \ 617 LM3533_ATTR_TYPE_THRESH_FALLING, _nr, 0) 618 619 #define ALS_THRESH_RAISING_ATTR_RW(_nr) \ 620 LM3533_ALS_ATTR(in_illuminance0_thresh##_nr##_raising_value, \ 621 S_IRUGO | S_IWUSR, \ 622 show_als_attr, store_als_attr, \ 623 LM3533_ATTR_TYPE_THRESH_RAISING, _nr, 0) 624 /* 625 * ALS Zone thresholds (boundaries) 626 * 627 * in_illuminance0_thresh[0-3]_falling_value 0-255 628 * in_illuminance0_thresh[0-3]_raising_value 0-255 629 */ 630 static ALS_THRESH_FALLING_ATTR_RW(0); 631 static ALS_THRESH_FALLING_ATTR_RW(1); 632 static ALS_THRESH_FALLING_ATTR_RW(2); 633 static ALS_THRESH_FALLING_ATTR_RW(3); 634 635 static ALS_THRESH_RAISING_ATTR_RW(0); 636 static ALS_THRESH_RAISING_ATTR_RW(1); 637 static ALS_THRESH_RAISING_ATTR_RW(2); 638 static ALS_THRESH_RAISING_ATTR_RW(3); 639 640 #define ALS_HYSTERESIS_ATTR_RO(_nr) \ 641 LM3533_ALS_ATTR(in_illuminance0_thresh##_nr##_hysteresis, \ 642 S_IRUGO, show_als_attr, NULL, \ 643 LM3533_ATTR_TYPE_HYSTERESIS, _nr, 0) 644 /* 645 * ALS Zone threshold hysteresis 646 * 647 * threshY_hysteresis = threshY_raising - threshY_falling 648 * 649 * in_illuminance0_thresh[0-3]_hysteresis 0-255 650 * in_illuminance0_thresh[0-3]_hysteresis 0-255 651 */ 652 static ALS_HYSTERESIS_ATTR_RO(0); 653 static ALS_HYSTERESIS_ATTR_RO(1); 654 static ALS_HYSTERESIS_ATTR_RO(2); 655 static ALS_HYSTERESIS_ATTR_RO(3); 656 657 #define ILLUMINANCE_ATTR_RO(_name) \ 658 DEVICE_ATTR(in_illuminance0_##_name, S_IRUGO, show_##_name, NULL) 659 #define ILLUMINANCE_ATTR_RW(_name) \ 660 DEVICE_ATTR(in_illuminance0_##_name, S_IRUGO | S_IWUSR , \ 661 show_##_name, store_##_name) 662 /* 663 * ALS Zone threshold-event enable 664 * 665 * in_illuminance0_thresh_either_en 0,1 666 */ 667 static ILLUMINANCE_ATTR_RW(thresh_either_en); 668 669 /* 670 * ALS Current Zone 671 * 672 * in_illuminance0_zone 0-4 673 */ 674 static ILLUMINANCE_ATTR_RO(zone); 675 676 static struct attribute *lm3533_als_event_attributes[] = { 677 &dev_attr_in_illuminance0_thresh_either_en.attr, 678 &lm3533_als_attr_in_illuminance0_thresh0_falling_value.dev_attr.attr, 679 &lm3533_als_attr_in_illuminance0_thresh0_hysteresis.dev_attr.attr, 680 &lm3533_als_attr_in_illuminance0_thresh0_raising_value.dev_attr.attr, 681 &lm3533_als_attr_in_illuminance0_thresh1_falling_value.dev_attr.attr, 682 &lm3533_als_attr_in_illuminance0_thresh1_hysteresis.dev_attr.attr, 683 &lm3533_als_attr_in_illuminance0_thresh1_raising_value.dev_attr.attr, 684 &lm3533_als_attr_in_illuminance0_thresh2_falling_value.dev_attr.attr, 685 &lm3533_als_attr_in_illuminance0_thresh2_hysteresis.dev_attr.attr, 686 &lm3533_als_attr_in_illuminance0_thresh2_raising_value.dev_attr.attr, 687 &lm3533_als_attr_in_illuminance0_thresh3_falling_value.dev_attr.attr, 688 &lm3533_als_attr_in_illuminance0_thresh3_hysteresis.dev_attr.attr, 689 &lm3533_als_attr_in_illuminance0_thresh3_raising_value.dev_attr.attr, 690 NULL 691 }; 692 693 static struct attribute_group lm3533_als_event_attribute_group = { 694 .attrs = lm3533_als_event_attributes 695 }; 696 697 static struct attribute *lm3533_als_attributes[] = { 698 &dev_attr_in_illuminance0_zone.attr, 699 &lm3533_als_attr_out_current0_current0_raw.dev_attr.attr, 700 &lm3533_als_attr_out_current0_current1_raw.dev_attr.attr, 701 &lm3533_als_attr_out_current0_current2_raw.dev_attr.attr, 702 &lm3533_als_attr_out_current0_current3_raw.dev_attr.attr, 703 &lm3533_als_attr_out_current0_current4_raw.dev_attr.attr, 704 &lm3533_als_attr_out_current1_current0_raw.dev_attr.attr, 705 &lm3533_als_attr_out_current1_current1_raw.dev_attr.attr, 706 &lm3533_als_attr_out_current1_current2_raw.dev_attr.attr, 707 &lm3533_als_attr_out_current1_current3_raw.dev_attr.attr, 708 &lm3533_als_attr_out_current1_current4_raw.dev_attr.attr, 709 &lm3533_als_attr_out_current2_current0_raw.dev_attr.attr, 710 &lm3533_als_attr_out_current2_current1_raw.dev_attr.attr, 711 &lm3533_als_attr_out_current2_current2_raw.dev_attr.attr, 712 &lm3533_als_attr_out_current2_current3_raw.dev_attr.attr, 713 &lm3533_als_attr_out_current2_current4_raw.dev_attr.attr, 714 NULL 715 }; 716 717 static struct attribute_group lm3533_als_attribute_group = { 718 .attrs = lm3533_als_attributes 719 }; 720 721 static int lm3533_als_set_input_mode(struct lm3533_als *als, bool pwm_mode) 722 { 723 u8 mask = LM3533_ALS_INPUT_MODE_MASK; 724 u8 val; 725 int ret; 726 727 if (pwm_mode) 728 val = mask; /* pwm input */ 729 else 730 val = 0; /* analog input */ 731 732 ret = lm3533_update(als->lm3533, LM3533_REG_ALS_CONF, val, mask); 733 if (ret) { 734 dev_err(&als->pdev->dev, "failed to set input mode %d\n", 735 pwm_mode); 736 return ret; 737 } 738 739 return 0; 740 } 741 742 static int lm3533_als_set_resistor(struct lm3533_als *als, u8 val) 743 { 744 int ret; 745 746 if (val < LM3533_ALS_RESISTOR_MIN || val > LM3533_ALS_RESISTOR_MAX) 747 return -EINVAL; 748 749 ret = lm3533_write(als->lm3533, LM3533_REG_ALS_RESISTOR_SELECT, val); 750 if (ret) { 751 dev_err(&als->pdev->dev, "failed to set resistor\n"); 752 return ret; 753 } 754 755 return 0; 756 } 757 758 static int lm3533_als_setup(struct lm3533_als *als, 759 struct lm3533_als_platform_data *pdata) 760 { 761 int ret; 762 763 ret = lm3533_als_set_input_mode(als, pdata->pwm_mode); 764 if (ret) 765 return ret; 766 767 /* ALS input is always high impedance in PWM-mode. */ 768 if (!pdata->pwm_mode) { 769 ret = lm3533_als_set_resistor(als, pdata->r_select); 770 if (ret) 771 return ret; 772 } 773 774 return 0; 775 } 776 777 static int lm3533_als_setup_irq(struct lm3533_als *als, void *dev) 778 { 779 u8 mask = LM3533_ALS_INT_ENABLE_MASK; 780 int ret; 781 782 /* Make sure interrupts are disabled. */ 783 ret = lm3533_update(als->lm3533, LM3533_REG_ALS_ZONE_INFO, 0, mask); 784 if (ret) { 785 dev_err(&als->pdev->dev, "failed to disable interrupts\n"); 786 return ret; 787 } 788 789 ret = request_threaded_irq(als->irq, NULL, lm3533_als_isr, 790 IRQF_TRIGGER_LOW | IRQF_ONESHOT, 791 dev_name(&als->pdev->dev), dev); 792 if (ret) { 793 dev_err(&als->pdev->dev, "failed to request irq %d\n", 794 als->irq); 795 return ret; 796 } 797 798 return 0; 799 } 800 801 static int lm3533_als_enable(struct lm3533_als *als) 802 { 803 u8 mask = LM3533_ALS_ENABLE_MASK; 804 int ret; 805 806 ret = lm3533_update(als->lm3533, LM3533_REG_ALS_CONF, mask, mask); 807 if (ret) 808 dev_err(&als->pdev->dev, "failed to enable ALS\n"); 809 810 return ret; 811 } 812 813 static int lm3533_als_disable(struct lm3533_als *als) 814 { 815 u8 mask = LM3533_ALS_ENABLE_MASK; 816 int ret; 817 818 ret = lm3533_update(als->lm3533, LM3533_REG_ALS_CONF, 0, mask); 819 if (ret) 820 dev_err(&als->pdev->dev, "failed to disable ALS\n"); 821 822 return ret; 823 } 824 825 static const struct iio_info lm3533_als_info = { 826 .attrs = &lm3533_als_attribute_group, 827 .event_attrs = &lm3533_als_event_attribute_group, 828 .driver_module = THIS_MODULE, 829 .read_raw = &lm3533_als_read_raw, 830 }; 831 832 static int lm3533_als_probe(struct platform_device *pdev) 833 { 834 struct lm3533 *lm3533; 835 struct lm3533_als_platform_data *pdata; 836 struct lm3533_als *als; 837 struct iio_dev *indio_dev; 838 int ret; 839 840 lm3533 = dev_get_drvdata(pdev->dev.parent); 841 if (!lm3533) 842 return -EINVAL; 843 844 pdata = pdev->dev.platform_data; 845 if (!pdata) { 846 dev_err(&pdev->dev, "no platform data\n"); 847 return -EINVAL; 848 } 849 850 indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*als)); 851 if (!indio_dev) 852 return -ENOMEM; 853 854 indio_dev->info = &lm3533_als_info; 855 indio_dev->channels = lm3533_als_channels; 856 indio_dev->num_channels = ARRAY_SIZE(lm3533_als_channels); 857 indio_dev->name = dev_name(&pdev->dev); 858 indio_dev->dev.parent = pdev->dev.parent; 859 indio_dev->modes = INDIO_DIRECT_MODE; 860 861 als = iio_priv(indio_dev); 862 als->lm3533 = lm3533; 863 als->pdev = pdev; 864 als->irq = lm3533->irq; 865 atomic_set(&als->zone, 0); 866 mutex_init(&als->thresh_mutex); 867 868 platform_set_drvdata(pdev, indio_dev); 869 870 if (als->irq) { 871 ret = lm3533_als_setup_irq(als, indio_dev); 872 if (ret) 873 return ret; 874 } 875 876 ret = lm3533_als_setup(als, pdata); 877 if (ret) 878 goto err_free_irq; 879 880 ret = lm3533_als_enable(als); 881 if (ret) 882 goto err_free_irq; 883 884 ret = iio_device_register(indio_dev); 885 if (ret) { 886 dev_err(&pdev->dev, "failed to register ALS\n"); 887 goto err_disable; 888 } 889 890 return 0; 891 892 err_disable: 893 lm3533_als_disable(als); 894 err_free_irq: 895 if (als->irq) 896 free_irq(als->irq, indio_dev); 897 898 return ret; 899 } 900 901 static int lm3533_als_remove(struct platform_device *pdev) 902 { 903 struct iio_dev *indio_dev = platform_get_drvdata(pdev); 904 struct lm3533_als *als = iio_priv(indio_dev); 905 906 lm3533_als_set_int_mode(indio_dev, false); 907 iio_device_unregister(indio_dev); 908 lm3533_als_disable(als); 909 if (als->irq) 910 free_irq(als->irq, indio_dev); 911 912 return 0; 913 } 914 915 static struct platform_driver lm3533_als_driver = { 916 .driver = { 917 .name = "lm3533-als", 918 }, 919 .probe = lm3533_als_probe, 920 .remove = lm3533_als_remove, 921 }; 922 module_platform_driver(lm3533_als_driver); 923 924 MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>"); 925 MODULE_DESCRIPTION("LM3533 Ambient Light Sensor driver"); 926 MODULE_LICENSE("GPL"); 927 MODULE_ALIAS("platform:lm3533-als"); 928