1 /* 2 * Copyright (c) 2015 Intel Corporation 3 * 4 * Driver for UPISEMI us5182d Proximity and Ambient Light Sensor. 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 as published by 8 * the Free Software Foundation. 9 * 10 * This program is distributed in the hope it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13 * more details. 14 * 15 * To do: Interrupt support. 16 */ 17 18 #include <linux/kernel.h> 19 #include <linux/module.h> 20 #include <linux/acpi.h> 21 #include <linux/delay.h> 22 #include <linux/i2c.h> 23 #include <linux/iio/events.h> 24 #include <linux/iio/iio.h> 25 #include <linux/interrupt.h> 26 #include <linux/irq.h> 27 #include <linux/iio/sysfs.h> 28 #include <linux/mutex.h> 29 #include <linux/pm.h> 30 #include <linux/pm_runtime.h> 31 32 #define US5182D_REG_CFG0 0x00 33 #define US5182D_CFG0_ONESHOT_EN BIT(6) 34 #define US5182D_CFG0_SHUTDOWN_EN BIT(7) 35 #define US5182D_CFG0_WORD_ENABLE BIT(0) 36 #define US5182D_CFG0_PROX BIT(3) 37 #define US5182D_CFG0_PX_IRQ BIT(2) 38 39 #define US5182D_REG_CFG1 0x01 40 #define US5182D_CFG1_ALS_RES16 BIT(4) 41 #define US5182D_CFG1_AGAIN_DEFAULT 0x00 42 43 #define US5182D_REG_CFG2 0x02 44 #define US5182D_CFG2_PX_RES16 BIT(4) 45 #define US5182D_CFG2_PXGAIN_DEFAULT BIT(2) 46 47 #define US5182D_REG_CFG3 0x03 48 #define US5182D_CFG3_LED_CURRENT100 (BIT(4) | BIT(5)) 49 #define US5182D_CFG3_INT_SOURCE_PX BIT(3) 50 51 #define US5182D_REG_CFG4 0x10 52 53 /* 54 * Registers for tuning the auto dark current cancelling feature. 55 * DARK_TH(reg 0x27,0x28) - threshold (counts) for auto dark cancelling. 56 * when ALS > DARK_TH --> ALS_Code = ALS - Upper(0x2A) * Dark 57 * when ALS < DARK_TH --> ALS_Code = ALS - Lower(0x29) * Dark 58 */ 59 #define US5182D_REG_UDARK_TH 0x27 60 #define US5182D_REG_DARK_AUTO_EN 0x2b 61 #define US5182D_REG_AUTO_LDARK_GAIN 0x29 62 #define US5182D_REG_AUTO_HDARK_GAIN 0x2a 63 64 /* Thresholds for events: px low (0x08-l, 0x09-h), px high (0x0a-l 0x0b-h) */ 65 #define US5182D_REG_PXL_TH 0x08 66 #define US5182D_REG_PXH_TH 0x0a 67 68 #define US5182D_REG_PXL_TH_DEFAULT 1000 69 #define US5182D_REG_PXH_TH_DEFAULT 30000 70 71 #define US5182D_OPMODE_ALS 0x01 72 #define US5182D_OPMODE_PX 0x02 73 #define US5182D_OPMODE_SHIFT 4 74 75 #define US5182D_REG_DARK_AUTO_EN_DEFAULT 0x80 76 #define US5182D_REG_AUTO_LDARK_GAIN_DEFAULT 0x16 77 #define US5182D_REG_AUTO_HDARK_GAIN_DEFAULT 0x00 78 79 #define US5182D_REG_ADL 0x0c 80 #define US5182D_REG_PDL 0x0e 81 82 #define US5182D_REG_MODE_STORE 0x21 83 #define US5182D_STORE_MODE 0x01 84 85 #define US5182D_REG_CHIPID 0xb2 86 87 #define US5182D_OPMODE_MASK GENMASK(5, 4) 88 #define US5182D_AGAIN_MASK 0x07 89 #define US5182D_RESET_CHIP 0x01 90 91 #define US5182D_CHIPID 0x26 92 #define US5182D_DRV_NAME "us5182d" 93 94 #define US5182D_GA_RESOLUTION 1000 95 96 #define US5182D_READ_BYTE 1 97 #define US5182D_READ_WORD 2 98 #define US5182D_OPSTORE_SLEEP_TIME 20 /* ms */ 99 #define US5182D_SLEEP_MS 3000 /* ms */ 100 #define US5182D_PXH_TH_DISABLE 0xffff 101 #define US5182D_PXL_TH_DISABLE 0x0000 102 103 /* Available ranges: [12354, 7065, 3998, 2202, 1285, 498, 256, 138] lux */ 104 static const int us5182d_scales[] = {188500, 107800, 61000, 33600, 19600, 7600, 105 3900, 2100}; 106 107 /* 108 * Experimental thresholds that work with US5182D sensor on evaluation board 109 * roughly between 12-32 lux 110 */ 111 static u16 us5182d_dark_ths_vals[] = {170, 200, 512, 512, 800, 2000, 4000, 112 8000}; 113 114 enum mode { 115 US5182D_ALS_PX, 116 US5182D_ALS_ONLY, 117 US5182D_PX_ONLY 118 }; 119 120 enum pmode { 121 US5182D_CONTINUOUS, 122 US5182D_ONESHOT 123 }; 124 125 struct us5182d_data { 126 struct i2c_client *client; 127 struct mutex lock; 128 129 /* Glass attenuation factor */ 130 u32 ga; 131 132 /* Dark gain tuning */ 133 u8 lower_dark_gain; 134 u8 upper_dark_gain; 135 u16 *us5182d_dark_ths; 136 137 u16 px_low_th; 138 u16 px_high_th; 139 140 int rising_en; 141 int falling_en; 142 143 u8 opmode; 144 u8 power_mode; 145 146 bool als_enabled; 147 bool px_enabled; 148 149 bool default_continuous; 150 }; 151 152 static IIO_CONST_ATTR(in_illuminance_scale_available, 153 "0.0021 0.0039 0.0076 0.0196 0.0336 0.061 0.1078 0.1885"); 154 155 static struct attribute *us5182d_attrs[] = { 156 &iio_const_attr_in_illuminance_scale_available.dev_attr.attr, 157 NULL 158 }; 159 160 static const struct attribute_group us5182d_attr_group = { 161 .attrs = us5182d_attrs, 162 }; 163 164 static const struct { 165 u8 reg; 166 u8 val; 167 } us5182d_regvals[] = { 168 {US5182D_REG_CFG0, US5182D_CFG0_WORD_ENABLE}, 169 {US5182D_REG_CFG1, US5182D_CFG1_ALS_RES16}, 170 {US5182D_REG_CFG2, (US5182D_CFG2_PX_RES16 | 171 US5182D_CFG2_PXGAIN_DEFAULT)}, 172 {US5182D_REG_CFG3, US5182D_CFG3_LED_CURRENT100 | 173 US5182D_CFG3_INT_SOURCE_PX}, 174 {US5182D_REG_CFG4, 0x00}, 175 }; 176 177 static const struct iio_event_spec us5182d_events[] = { 178 { 179 .type = IIO_EV_TYPE_THRESH, 180 .dir = IIO_EV_DIR_RISING, 181 .mask_separate = BIT(IIO_EV_INFO_VALUE) | 182 BIT(IIO_EV_INFO_ENABLE), 183 }, 184 { 185 .type = IIO_EV_TYPE_THRESH, 186 .dir = IIO_EV_DIR_FALLING, 187 .mask_separate = BIT(IIO_EV_INFO_VALUE) | 188 BIT(IIO_EV_INFO_ENABLE), 189 }, 190 }; 191 192 static const struct iio_chan_spec us5182d_channels[] = { 193 { 194 .type = IIO_LIGHT, 195 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 196 BIT(IIO_CHAN_INFO_SCALE), 197 }, 198 { 199 .type = IIO_PROXIMITY, 200 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 201 .event_spec = us5182d_events, 202 .num_event_specs = ARRAY_SIZE(us5182d_events), 203 } 204 }; 205 206 static int us5182d_oneshot_en(struct us5182d_data *data) 207 { 208 int ret; 209 210 ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG0); 211 if (ret < 0) 212 return ret; 213 214 /* 215 * In oneshot mode the chip will power itself down after taking the 216 * required measurement. 217 */ 218 ret = ret | US5182D_CFG0_ONESHOT_EN; 219 220 return i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG0, ret); 221 } 222 223 static int us5182d_set_opmode(struct us5182d_data *data, u8 mode) 224 { 225 int ret; 226 227 if (mode == data->opmode) 228 return 0; 229 230 ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG0); 231 if (ret < 0) 232 return ret; 233 234 /* update mode */ 235 ret = ret & ~US5182D_OPMODE_MASK; 236 ret = ret | (mode << US5182D_OPMODE_SHIFT); 237 238 /* 239 * After updating the operating mode, the chip requires that 240 * the operation is stored, by writing 1 in the STORE_MODE 241 * register (auto-clearing). 242 */ 243 ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG0, ret); 244 if (ret < 0) 245 return ret; 246 247 ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_MODE_STORE, 248 US5182D_STORE_MODE); 249 if (ret < 0) 250 return ret; 251 252 data->opmode = mode; 253 msleep(US5182D_OPSTORE_SLEEP_TIME); 254 255 return 0; 256 } 257 258 static int us5182d_als_enable(struct us5182d_data *data) 259 { 260 int ret; 261 u8 mode; 262 263 if (data->power_mode == US5182D_ONESHOT) { 264 ret = us5182d_set_opmode(data, US5182D_ALS_ONLY); 265 if (ret < 0) 266 return ret; 267 data->px_enabled = false; 268 } 269 270 if (data->als_enabled) 271 return 0; 272 273 mode = data->px_enabled ? US5182D_ALS_PX : US5182D_ALS_ONLY; 274 275 ret = us5182d_set_opmode(data, mode); 276 if (ret < 0) 277 return ret; 278 279 data->als_enabled = true; 280 281 return 0; 282 } 283 284 static int us5182d_px_enable(struct us5182d_data *data) 285 { 286 int ret; 287 u8 mode; 288 289 if (data->power_mode == US5182D_ONESHOT) { 290 ret = us5182d_set_opmode(data, US5182D_PX_ONLY); 291 if (ret < 0) 292 return ret; 293 data->als_enabled = false; 294 } 295 296 if (data->px_enabled) 297 return 0; 298 299 mode = data->als_enabled ? US5182D_ALS_PX : US5182D_PX_ONLY; 300 301 ret = us5182d_set_opmode(data, mode); 302 if (ret < 0) 303 return ret; 304 305 data->px_enabled = true; 306 307 return 0; 308 } 309 310 static int us5182d_get_als(struct us5182d_data *data) 311 { 312 int ret; 313 unsigned long result; 314 315 ret = us5182d_als_enable(data); 316 if (ret < 0) 317 return ret; 318 319 ret = i2c_smbus_read_word_data(data->client, 320 US5182D_REG_ADL); 321 if (ret < 0) 322 return ret; 323 324 result = ret * data->ga / US5182D_GA_RESOLUTION; 325 if (result > 0xffff) 326 result = 0xffff; 327 328 return result; 329 } 330 331 static int us5182d_get_px(struct us5182d_data *data) 332 { 333 int ret; 334 335 ret = us5182d_px_enable(data); 336 if (ret < 0) 337 return ret; 338 339 return i2c_smbus_read_word_data(data->client, 340 US5182D_REG_PDL); 341 } 342 343 static int us5182d_shutdown_en(struct us5182d_data *data, u8 state) 344 { 345 int ret; 346 347 if (data->power_mode == US5182D_ONESHOT) 348 return 0; 349 350 ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG0); 351 if (ret < 0) 352 return ret; 353 354 ret = ret & ~US5182D_CFG0_SHUTDOWN_EN; 355 ret = ret | state; 356 357 ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG0, ret); 358 if (ret < 0) 359 return ret; 360 361 if (state & US5182D_CFG0_SHUTDOWN_EN) { 362 data->als_enabled = false; 363 data->px_enabled = false; 364 } 365 366 return ret; 367 } 368 369 370 static int us5182d_set_power_state(struct us5182d_data *data, bool on) 371 { 372 int ret; 373 374 if (data->power_mode == US5182D_ONESHOT) 375 return 0; 376 377 if (on) { 378 ret = pm_runtime_get_sync(&data->client->dev); 379 if (ret < 0) 380 pm_runtime_put_noidle(&data->client->dev); 381 } else { 382 pm_runtime_mark_last_busy(&data->client->dev); 383 ret = pm_runtime_put_autosuspend(&data->client->dev); 384 } 385 386 return ret; 387 } 388 389 static int us5182d_read_value(struct us5182d_data *data, 390 struct iio_chan_spec const *chan) 391 { 392 int ret, value; 393 394 mutex_lock(&data->lock); 395 396 if (data->power_mode == US5182D_ONESHOT) { 397 ret = us5182d_oneshot_en(data); 398 if (ret < 0) 399 goto out_err; 400 } 401 402 ret = us5182d_set_power_state(data, true); 403 if (ret < 0) 404 goto out_err; 405 406 if (chan->type == IIO_LIGHT) 407 ret = us5182d_get_als(data); 408 else 409 ret = us5182d_get_px(data); 410 if (ret < 0) 411 goto out_poweroff; 412 413 value = ret; 414 415 ret = us5182d_set_power_state(data, false); 416 if (ret < 0) 417 goto out_err; 418 419 mutex_unlock(&data->lock); 420 return value; 421 422 out_poweroff: 423 us5182d_set_power_state(data, false); 424 out_err: 425 mutex_unlock(&data->lock); 426 return ret; 427 } 428 429 static int us5182d_read_raw(struct iio_dev *indio_dev, 430 struct iio_chan_spec const *chan, int *val, 431 int *val2, long mask) 432 { 433 struct us5182d_data *data = iio_priv(indio_dev); 434 int ret; 435 436 switch (mask) { 437 case IIO_CHAN_INFO_RAW: 438 ret = us5182d_read_value(data, chan); 439 if (ret < 0) 440 return ret; 441 *val = ret; 442 return IIO_VAL_INT; 443 case IIO_CHAN_INFO_SCALE: 444 ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG1); 445 if (ret < 0) 446 return ret; 447 *val = 0; 448 *val2 = us5182d_scales[ret & US5182D_AGAIN_MASK]; 449 return IIO_VAL_INT_PLUS_MICRO; 450 default: 451 return -EINVAL; 452 } 453 } 454 455 /** 456 * us5182d_update_dark_th - update Darh_Th registers 457 * @data us5182d_data structure 458 * @index index in us5182d_dark_ths array to use for the updated value 459 * 460 * Function needs to be called with a lock held because it needs two i2c write 461 * byte operations as these registers (0x27 0x28) don't work in word mode 462 * accessing. 463 */ 464 static int us5182d_update_dark_th(struct us5182d_data *data, int index) 465 { 466 __be16 dark_th = cpu_to_be16(data->us5182d_dark_ths[index]); 467 int ret; 468 469 ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_UDARK_TH, 470 ((u8 *)&dark_th)[0]); 471 if (ret < 0) 472 return ret; 473 474 return i2c_smbus_write_byte_data(data->client, US5182D_REG_UDARK_TH + 1, 475 ((u8 *)&dark_th)[1]); 476 } 477 478 /** 479 * us5182d_apply_scale - update the ALS scale 480 * @data us5182d_data structure 481 * @index index in us5182d_scales array to use for the updated value 482 * 483 * Function needs to be called with a lock held as we're having more than one 484 * i2c operation. 485 */ 486 static int us5182d_apply_scale(struct us5182d_data *data, int index) 487 { 488 int ret; 489 490 ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG1); 491 if (ret < 0) 492 return ret; 493 494 ret = ret & (~US5182D_AGAIN_MASK); 495 ret |= index; 496 497 ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG1, ret); 498 if (ret < 0) 499 return ret; 500 501 return us5182d_update_dark_th(data, index); 502 } 503 504 static int us5182d_write_raw(struct iio_dev *indio_dev, 505 struct iio_chan_spec const *chan, int val, 506 int val2, long mask) 507 { 508 struct us5182d_data *data = iio_priv(indio_dev); 509 int ret, i; 510 511 switch (mask) { 512 case IIO_CHAN_INFO_SCALE: 513 if (val != 0) 514 return -EINVAL; 515 for (i = 0; i < ARRAY_SIZE(us5182d_scales); i++) 516 if (val2 == us5182d_scales[i]) { 517 mutex_lock(&data->lock); 518 ret = us5182d_apply_scale(data, i); 519 mutex_unlock(&data->lock); 520 return ret; 521 } 522 break; 523 default: 524 return -EINVAL; 525 } 526 527 return -EINVAL; 528 } 529 530 static int us5182d_setup_prox(struct iio_dev *indio_dev, 531 enum iio_event_direction dir, u16 val) 532 { 533 struct us5182d_data *data = iio_priv(indio_dev); 534 535 if (dir == IIO_EV_DIR_FALLING) 536 return i2c_smbus_write_word_data(data->client, 537 US5182D_REG_PXL_TH, val); 538 else if (dir == IIO_EV_DIR_RISING) 539 return i2c_smbus_write_word_data(data->client, 540 US5182D_REG_PXH_TH, val); 541 542 return 0; 543 } 544 545 static int us5182d_read_thresh(struct iio_dev *indio_dev, 546 const struct iio_chan_spec *chan, enum iio_event_type type, 547 enum iio_event_direction dir, enum iio_event_info info, int *val, 548 int *val2) 549 { 550 struct us5182d_data *data = iio_priv(indio_dev); 551 552 switch (dir) { 553 case IIO_EV_DIR_RISING: 554 mutex_lock(&data->lock); 555 *val = data->px_high_th; 556 mutex_unlock(&data->lock); 557 break; 558 case IIO_EV_DIR_FALLING: 559 mutex_lock(&data->lock); 560 *val = data->px_low_th; 561 mutex_unlock(&data->lock); 562 break; 563 default: 564 return -EINVAL; 565 } 566 567 return IIO_VAL_INT; 568 } 569 570 static int us5182d_write_thresh(struct iio_dev *indio_dev, 571 const struct iio_chan_spec *chan, enum iio_event_type type, 572 enum iio_event_direction dir, enum iio_event_info info, int val, 573 int val2) 574 { 575 struct us5182d_data *data = iio_priv(indio_dev); 576 int ret; 577 578 if (val < 0 || val > USHRT_MAX || val2 != 0) 579 return -EINVAL; 580 581 switch (dir) { 582 case IIO_EV_DIR_RISING: 583 mutex_lock(&data->lock); 584 if (data->rising_en) { 585 ret = us5182d_setup_prox(indio_dev, dir, val); 586 if (ret < 0) 587 goto err; 588 } 589 data->px_high_th = val; 590 mutex_unlock(&data->lock); 591 break; 592 case IIO_EV_DIR_FALLING: 593 mutex_lock(&data->lock); 594 if (data->falling_en) { 595 ret = us5182d_setup_prox(indio_dev, dir, val); 596 if (ret < 0) 597 goto err; 598 } 599 data->px_low_th = val; 600 mutex_unlock(&data->lock); 601 break; 602 default: 603 return -EINVAL; 604 } 605 606 return 0; 607 err: 608 mutex_unlock(&data->lock); 609 return ret; 610 } 611 612 static int us5182d_read_event_config(struct iio_dev *indio_dev, 613 const struct iio_chan_spec *chan, enum iio_event_type type, 614 enum iio_event_direction dir) 615 { 616 struct us5182d_data *data = iio_priv(indio_dev); 617 int ret; 618 619 switch (dir) { 620 case IIO_EV_DIR_RISING: 621 mutex_lock(&data->lock); 622 ret = data->rising_en; 623 mutex_unlock(&data->lock); 624 break; 625 case IIO_EV_DIR_FALLING: 626 mutex_lock(&data->lock); 627 ret = data->falling_en; 628 mutex_unlock(&data->lock); 629 break; 630 default: 631 ret = -EINVAL; 632 break; 633 } 634 635 return ret; 636 } 637 638 static int us5182d_write_event_config(struct iio_dev *indio_dev, 639 const struct iio_chan_spec *chan, enum iio_event_type type, 640 enum iio_event_direction dir, int state) 641 { 642 struct us5182d_data *data = iio_priv(indio_dev); 643 int ret; 644 u16 new_th; 645 646 mutex_lock(&data->lock); 647 648 switch (dir) { 649 case IIO_EV_DIR_RISING: 650 if (data->rising_en == state) { 651 mutex_unlock(&data->lock); 652 return 0; 653 } 654 new_th = US5182D_PXH_TH_DISABLE; 655 if (state) { 656 data->power_mode = US5182D_CONTINUOUS; 657 ret = us5182d_set_power_state(data, true); 658 if (ret < 0) 659 goto err; 660 ret = us5182d_px_enable(data); 661 if (ret < 0) 662 goto err_poweroff; 663 new_th = data->px_high_th; 664 } 665 ret = us5182d_setup_prox(indio_dev, dir, new_th); 666 if (ret < 0) 667 goto err_poweroff; 668 data->rising_en = state; 669 break; 670 case IIO_EV_DIR_FALLING: 671 if (data->falling_en == state) { 672 mutex_unlock(&data->lock); 673 return 0; 674 } 675 new_th = US5182D_PXL_TH_DISABLE; 676 if (state) { 677 data->power_mode = US5182D_CONTINUOUS; 678 ret = us5182d_set_power_state(data, true); 679 if (ret < 0) 680 goto err; 681 ret = us5182d_px_enable(data); 682 if (ret < 0) 683 goto err_poweroff; 684 new_th = data->px_low_th; 685 } 686 ret = us5182d_setup_prox(indio_dev, dir, new_th); 687 if (ret < 0) 688 goto err_poweroff; 689 data->falling_en = state; 690 break; 691 default: 692 ret = -EINVAL; 693 goto err; 694 } 695 696 if (!state) { 697 ret = us5182d_set_power_state(data, false); 698 if (ret < 0) 699 goto err; 700 } 701 702 if (!data->falling_en && !data->rising_en && !data->default_continuous) 703 data->power_mode = US5182D_ONESHOT; 704 705 mutex_unlock(&data->lock); 706 return 0; 707 708 err_poweroff: 709 if (state) 710 us5182d_set_power_state(data, false); 711 err: 712 mutex_unlock(&data->lock); 713 return ret; 714 } 715 716 static const struct iio_info us5182d_info = { 717 .driver_module = THIS_MODULE, 718 .read_raw = us5182d_read_raw, 719 .write_raw = us5182d_write_raw, 720 .attrs = &us5182d_attr_group, 721 .read_event_value = &us5182d_read_thresh, 722 .write_event_value = &us5182d_write_thresh, 723 .read_event_config = &us5182d_read_event_config, 724 .write_event_config = &us5182d_write_event_config, 725 }; 726 727 static int us5182d_reset(struct iio_dev *indio_dev) 728 { 729 struct us5182d_data *data = iio_priv(indio_dev); 730 731 return i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG3, 732 US5182D_RESET_CHIP); 733 } 734 735 static int us5182d_init(struct iio_dev *indio_dev) 736 { 737 struct us5182d_data *data = iio_priv(indio_dev); 738 int i, ret; 739 740 ret = us5182d_reset(indio_dev); 741 if (ret < 0) 742 return ret; 743 744 data->opmode = 0; 745 data->power_mode = US5182D_CONTINUOUS; 746 data->px_low_th = US5182D_REG_PXL_TH_DEFAULT; 747 data->px_high_th = US5182D_REG_PXH_TH_DEFAULT; 748 749 for (i = 0; i < ARRAY_SIZE(us5182d_regvals); i++) { 750 ret = i2c_smbus_write_byte_data(data->client, 751 us5182d_regvals[i].reg, 752 us5182d_regvals[i].val); 753 if (ret < 0) 754 return ret; 755 } 756 757 data->als_enabled = true; 758 data->px_enabled = true; 759 760 if (!data->default_continuous) { 761 ret = us5182d_shutdown_en(data, US5182D_CFG0_SHUTDOWN_EN); 762 if (ret < 0) 763 return ret; 764 data->power_mode = US5182D_ONESHOT; 765 } 766 767 return ret; 768 } 769 770 static void us5182d_get_platform_data(struct iio_dev *indio_dev) 771 { 772 struct us5182d_data *data = iio_priv(indio_dev); 773 774 if (device_property_read_u32(&data->client->dev, "upisemi,glass-coef", 775 &data->ga)) 776 data->ga = US5182D_GA_RESOLUTION; 777 if (device_property_read_u16_array(&data->client->dev, 778 "upisemi,dark-ths", 779 data->us5182d_dark_ths, 780 ARRAY_SIZE(us5182d_dark_ths_vals))) 781 data->us5182d_dark_ths = us5182d_dark_ths_vals; 782 if (device_property_read_u8(&data->client->dev, 783 "upisemi,upper-dark-gain", 784 &data->upper_dark_gain)) 785 data->upper_dark_gain = US5182D_REG_AUTO_HDARK_GAIN_DEFAULT; 786 if (device_property_read_u8(&data->client->dev, 787 "upisemi,lower-dark-gain", 788 &data->lower_dark_gain)) 789 data->lower_dark_gain = US5182D_REG_AUTO_LDARK_GAIN_DEFAULT; 790 data->default_continuous = device_property_read_bool(&data->client->dev, 791 "upisemi,continuous"); 792 } 793 794 static int us5182d_dark_gain_config(struct iio_dev *indio_dev) 795 { 796 struct us5182d_data *data = iio_priv(indio_dev); 797 int ret; 798 799 ret = us5182d_update_dark_th(data, US5182D_CFG1_AGAIN_DEFAULT); 800 if (ret < 0) 801 return ret; 802 803 ret = i2c_smbus_write_byte_data(data->client, 804 US5182D_REG_AUTO_LDARK_GAIN, 805 data->lower_dark_gain); 806 if (ret < 0) 807 return ret; 808 809 ret = i2c_smbus_write_byte_data(data->client, 810 US5182D_REG_AUTO_HDARK_GAIN, 811 data->upper_dark_gain); 812 if (ret < 0) 813 return ret; 814 815 return i2c_smbus_write_byte_data(data->client, US5182D_REG_DARK_AUTO_EN, 816 US5182D_REG_DARK_AUTO_EN_DEFAULT); 817 } 818 819 static irqreturn_t us5182d_irq_thread_handler(int irq, void *private) 820 { 821 struct iio_dev *indio_dev = private; 822 struct us5182d_data *data = iio_priv(indio_dev); 823 enum iio_event_direction dir; 824 int ret; 825 u64 ev; 826 827 ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG0); 828 if (ret < 0) { 829 dev_err(&data->client->dev, "i2c transfer error in irq\n"); 830 return IRQ_HANDLED; 831 } 832 833 dir = ret & US5182D_CFG0_PROX ? IIO_EV_DIR_RISING : IIO_EV_DIR_FALLING; 834 ev = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 1, IIO_EV_TYPE_THRESH, dir); 835 836 iio_push_event(indio_dev, ev, iio_get_time_ns(indio_dev)); 837 838 ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG0, 839 ret & ~US5182D_CFG0_PX_IRQ); 840 if (ret < 0) 841 dev_err(&data->client->dev, "i2c transfer error in irq\n"); 842 843 return IRQ_HANDLED; 844 } 845 846 static int us5182d_probe(struct i2c_client *client, 847 const struct i2c_device_id *id) 848 { 849 struct us5182d_data *data; 850 struct iio_dev *indio_dev; 851 int ret; 852 853 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); 854 if (!indio_dev) 855 return -ENOMEM; 856 857 data = iio_priv(indio_dev); 858 i2c_set_clientdata(client, indio_dev); 859 data->client = client; 860 861 mutex_init(&data->lock); 862 863 indio_dev->dev.parent = &client->dev; 864 indio_dev->info = &us5182d_info; 865 indio_dev->name = US5182D_DRV_NAME; 866 indio_dev->channels = us5182d_channels; 867 indio_dev->num_channels = ARRAY_SIZE(us5182d_channels); 868 indio_dev->modes = INDIO_DIRECT_MODE; 869 870 ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CHIPID); 871 if (ret != US5182D_CHIPID) { 872 dev_err(&data->client->dev, 873 "Failed to detect US5182 light chip\n"); 874 return (ret < 0) ? ret : -ENODEV; 875 } 876 877 if (client->irq > 0) { 878 ret = devm_request_threaded_irq(&client->dev, client->irq, NULL, 879 us5182d_irq_thread_handler, 880 IRQF_TRIGGER_LOW | IRQF_ONESHOT, 881 "us5182d-irq", indio_dev); 882 if (ret < 0) 883 return ret; 884 } else 885 dev_warn(&client->dev, "no valid irq found\n"); 886 887 us5182d_get_platform_data(indio_dev); 888 ret = us5182d_init(indio_dev); 889 if (ret < 0) 890 return ret; 891 892 ret = us5182d_dark_gain_config(indio_dev); 893 if (ret < 0) 894 goto out_err; 895 896 if (data->default_continuous) { 897 ret = pm_runtime_set_active(&client->dev); 898 if (ret < 0) 899 goto out_err; 900 } 901 902 pm_runtime_enable(&client->dev); 903 pm_runtime_set_autosuspend_delay(&client->dev, 904 US5182D_SLEEP_MS); 905 pm_runtime_use_autosuspend(&client->dev); 906 907 ret = iio_device_register(indio_dev); 908 if (ret < 0) 909 goto out_err; 910 911 return 0; 912 913 out_err: 914 us5182d_shutdown_en(data, US5182D_CFG0_SHUTDOWN_EN); 915 return ret; 916 917 } 918 919 static int us5182d_remove(struct i2c_client *client) 920 { 921 struct us5182d_data *data = iio_priv(i2c_get_clientdata(client)); 922 923 iio_device_unregister(i2c_get_clientdata(client)); 924 925 pm_runtime_disable(&client->dev); 926 pm_runtime_set_suspended(&client->dev); 927 928 return us5182d_shutdown_en(data, US5182D_CFG0_SHUTDOWN_EN); 929 } 930 931 #if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM) 932 static int us5182d_suspend(struct device *dev) 933 { 934 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 935 struct us5182d_data *data = iio_priv(indio_dev); 936 937 if (data->power_mode == US5182D_CONTINUOUS) 938 return us5182d_shutdown_en(data, US5182D_CFG0_SHUTDOWN_EN); 939 940 return 0; 941 } 942 943 static int us5182d_resume(struct device *dev) 944 { 945 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 946 struct us5182d_data *data = iio_priv(indio_dev); 947 948 if (data->power_mode == US5182D_CONTINUOUS) 949 return us5182d_shutdown_en(data, 950 ~US5182D_CFG0_SHUTDOWN_EN & 0xff); 951 952 return 0; 953 } 954 #endif 955 956 static const struct dev_pm_ops us5182d_pm_ops = { 957 SET_SYSTEM_SLEEP_PM_OPS(us5182d_suspend, us5182d_resume) 958 SET_RUNTIME_PM_OPS(us5182d_suspend, us5182d_resume, NULL) 959 }; 960 961 static const struct acpi_device_id us5182d_acpi_match[] = { 962 { "USD5182", 0}, 963 {} 964 }; 965 966 MODULE_DEVICE_TABLE(acpi, us5182d_acpi_match); 967 968 static const struct i2c_device_id us5182d_id[] = { 969 {"usd5182", 0}, 970 {} 971 }; 972 973 MODULE_DEVICE_TABLE(i2c, us5182d_id); 974 975 static const struct of_device_id us5182d_of_match[] = { 976 { .compatible = "upisemi,usd5182" }, 977 {} 978 }; 979 MODULE_DEVICE_TABLE(of, us5182d_of_match); 980 981 static struct i2c_driver us5182d_driver = { 982 .driver = { 983 .name = US5182D_DRV_NAME, 984 .pm = &us5182d_pm_ops, 985 .of_match_table = us5182d_of_match, 986 .acpi_match_table = ACPI_PTR(us5182d_acpi_match), 987 }, 988 .probe = us5182d_probe, 989 .remove = us5182d_remove, 990 .id_table = us5182d_id, 991 992 }; 993 module_i2c_driver(us5182d_driver); 994 995 MODULE_AUTHOR("Adriana Reus <adriana.reus@intel.com>"); 996 MODULE_DESCRIPTION("Driver for us5182d Proximity and Light Sensor"); 997 MODULE_LICENSE("GPL v2"); 998