1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * A iio driver for the light sensor ISL 29018/29023/29035. 4 * 5 * IIO driver for monitoring ambient light intensity in luxi, proximity 6 * sensing and infrared sensing. 7 * 8 * Copyright (c) 2010, NVIDIA Corporation. 9 */ 10 11 #include <linux/i2c.h> 12 #include <linux/err.h> 13 #include <linux/mod_devicetable.h> 14 #include <linux/module.h> 15 #include <linux/mutex.h> 16 #include <linux/delay.h> 17 #include <linux/regmap.h> 18 #include <linux/regulator/consumer.h> 19 #include <linux/slab.h> 20 21 #include <linux/iio/iio.h> 22 #include <linux/iio/sysfs.h> 23 24 #define ISL29018_CONV_TIME_MS 100 25 26 #define ISL29018_REG_ADD_COMMAND1 0x00 27 #define ISL29018_CMD1_OPMODE_SHIFT 5 28 #define ISL29018_CMD1_OPMODE_MASK (7 << ISL29018_CMD1_OPMODE_SHIFT) 29 #define ISL29018_CMD1_OPMODE_POWER_DOWN 0 30 #define ISL29018_CMD1_OPMODE_ALS_ONCE 1 31 #define ISL29018_CMD1_OPMODE_IR_ONCE 2 32 #define ISL29018_CMD1_OPMODE_PROX_ONCE 3 33 34 #define ISL29018_REG_ADD_COMMAND2 0x01 35 #define ISL29018_CMD2_RESOLUTION_SHIFT 2 36 #define ISL29018_CMD2_RESOLUTION_MASK (0x3 << ISL29018_CMD2_RESOLUTION_SHIFT) 37 38 #define ISL29018_CMD2_RANGE_SHIFT 0 39 #define ISL29018_CMD2_RANGE_MASK (0x3 << ISL29018_CMD2_RANGE_SHIFT) 40 41 #define ISL29018_CMD2_SCHEME_SHIFT 7 42 #define ISL29018_CMD2_SCHEME_MASK (0x1 << ISL29018_CMD2_SCHEME_SHIFT) 43 44 #define ISL29018_REG_ADD_DATA_LSB 0x02 45 #define ISL29018_REG_ADD_DATA_MSB 0x03 46 47 #define ISL29018_REG_TEST 0x08 48 #define ISL29018_TEST_SHIFT 0 49 #define ISL29018_TEST_MASK (0xFF << ISL29018_TEST_SHIFT) 50 51 #define ISL29035_REG_DEVICE_ID 0x0F 52 #define ISL29035_DEVICE_ID_SHIFT 0x03 53 #define ISL29035_DEVICE_ID_MASK (0x7 << ISL29035_DEVICE_ID_SHIFT) 54 #define ISL29035_DEVICE_ID 0x5 55 #define ISL29035_BOUT_SHIFT 0x07 56 #define ISL29035_BOUT_MASK (0x01 << ISL29035_BOUT_SHIFT) 57 58 enum isl29018_int_time { 59 ISL29018_INT_TIME_16, 60 ISL29018_INT_TIME_12, 61 ISL29018_INT_TIME_8, 62 ISL29018_INT_TIME_4, 63 }; 64 65 static const unsigned int isl29018_int_utimes[3][4] = { 66 {90000, 5630, 351, 21}, 67 {90000, 5600, 352, 22}, 68 {105000, 6500, 410, 25}, 69 }; 70 71 static const struct isl29018_scale { 72 unsigned int scale; 73 unsigned int uscale; 74 } isl29018_scales[4][4] = { 75 { {0, 15258}, {0, 61035}, {0, 244140}, {0, 976562} }, 76 { {0, 244140}, {0, 976562}, {3, 906250}, {15, 625000} }, 77 { {3, 906250}, {15, 625000}, {62, 500000}, {250, 0} }, 78 { {62, 500000}, {250, 0}, {1000, 0}, {4000, 0} } 79 }; 80 81 struct isl29018_chip { 82 struct regmap *regmap; 83 struct mutex lock; 84 int type; 85 unsigned int calibscale; 86 unsigned int ucalibscale; 87 unsigned int int_time; 88 struct isl29018_scale scale; 89 int prox_scheme; 90 bool suspended; 91 struct regulator *vcc_reg; 92 }; 93 94 static int isl29018_set_integration_time(struct isl29018_chip *chip, 95 unsigned int utime) 96 { 97 unsigned int i; 98 int ret; 99 unsigned int int_time, new_int_time; 100 101 for (i = 0; i < ARRAY_SIZE(isl29018_int_utimes[chip->type]); ++i) { 102 if (utime == isl29018_int_utimes[chip->type][i]) { 103 new_int_time = i; 104 break; 105 } 106 } 107 108 if (i >= ARRAY_SIZE(isl29018_int_utimes[chip->type])) 109 return -EINVAL; 110 111 ret = regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMAND2, 112 ISL29018_CMD2_RESOLUTION_MASK, 113 i << ISL29018_CMD2_RESOLUTION_SHIFT); 114 if (ret < 0) 115 return ret; 116 117 /* Keep the same range when integration time changes */ 118 int_time = chip->int_time; 119 for (i = 0; i < ARRAY_SIZE(isl29018_scales[int_time]); ++i) { 120 if (chip->scale.scale == isl29018_scales[int_time][i].scale && 121 chip->scale.uscale == isl29018_scales[int_time][i].uscale) { 122 chip->scale = isl29018_scales[new_int_time][i]; 123 break; 124 } 125 } 126 chip->int_time = new_int_time; 127 128 return 0; 129 } 130 131 static int isl29018_set_scale(struct isl29018_chip *chip, int scale, int uscale) 132 { 133 unsigned int i; 134 int ret; 135 struct isl29018_scale new_scale; 136 137 for (i = 0; i < ARRAY_SIZE(isl29018_scales[chip->int_time]); ++i) { 138 if (scale == isl29018_scales[chip->int_time][i].scale && 139 uscale == isl29018_scales[chip->int_time][i].uscale) { 140 new_scale = isl29018_scales[chip->int_time][i]; 141 break; 142 } 143 } 144 145 if (i >= ARRAY_SIZE(isl29018_scales[chip->int_time])) 146 return -EINVAL; 147 148 ret = regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMAND2, 149 ISL29018_CMD2_RANGE_MASK, 150 i << ISL29018_CMD2_RANGE_SHIFT); 151 if (ret < 0) 152 return ret; 153 154 chip->scale = new_scale; 155 156 return 0; 157 } 158 159 static int isl29018_read_sensor_input(struct isl29018_chip *chip, int mode) 160 { 161 int status; 162 unsigned int lsb; 163 unsigned int msb; 164 struct device *dev = regmap_get_device(chip->regmap); 165 166 /* Set mode */ 167 status = regmap_write(chip->regmap, ISL29018_REG_ADD_COMMAND1, 168 mode << ISL29018_CMD1_OPMODE_SHIFT); 169 if (status) { 170 dev_err(dev, 171 "Error in setting operating mode err %d\n", status); 172 return status; 173 } 174 msleep(ISL29018_CONV_TIME_MS); 175 status = regmap_read(chip->regmap, ISL29018_REG_ADD_DATA_LSB, &lsb); 176 if (status < 0) { 177 dev_err(dev, 178 "Error in reading LSB DATA with err %d\n", status); 179 return status; 180 } 181 182 status = regmap_read(chip->regmap, ISL29018_REG_ADD_DATA_MSB, &msb); 183 if (status < 0) { 184 dev_err(dev, 185 "Error in reading MSB DATA with error %d\n", status); 186 return status; 187 } 188 dev_vdbg(dev, "MSB 0x%x and LSB 0x%x\n", msb, lsb); 189 190 return (msb << 8) | lsb; 191 } 192 193 static int isl29018_read_lux(struct isl29018_chip *chip, int *lux) 194 { 195 int lux_data; 196 unsigned int data_x_range; 197 198 lux_data = isl29018_read_sensor_input(chip, 199 ISL29018_CMD1_OPMODE_ALS_ONCE); 200 if (lux_data < 0) 201 return lux_data; 202 203 data_x_range = lux_data * chip->scale.scale + 204 lux_data * chip->scale.uscale / 1000000; 205 *lux = data_x_range * chip->calibscale + 206 data_x_range * chip->ucalibscale / 1000000; 207 208 return 0; 209 } 210 211 static int isl29018_read_ir(struct isl29018_chip *chip, int *ir) 212 { 213 int ir_data; 214 215 ir_data = isl29018_read_sensor_input(chip, 216 ISL29018_CMD1_OPMODE_IR_ONCE); 217 if (ir_data < 0) 218 return ir_data; 219 220 *ir = ir_data; 221 222 return 0; 223 } 224 225 static int isl29018_read_proximity_ir(struct isl29018_chip *chip, int scheme, 226 int *near_ir) 227 { 228 int status; 229 int prox_data = -1; 230 int ir_data = -1; 231 struct device *dev = regmap_get_device(chip->regmap); 232 233 /* Do proximity sensing with required scheme */ 234 status = regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMAND2, 235 ISL29018_CMD2_SCHEME_MASK, 236 scheme << ISL29018_CMD2_SCHEME_SHIFT); 237 if (status) { 238 dev_err(dev, "Error in setting operating mode\n"); 239 return status; 240 } 241 242 prox_data = isl29018_read_sensor_input(chip, 243 ISL29018_CMD1_OPMODE_PROX_ONCE); 244 if (prox_data < 0) 245 return prox_data; 246 247 if (scheme == 1) { 248 *near_ir = prox_data; 249 return 0; 250 } 251 252 ir_data = isl29018_read_sensor_input(chip, 253 ISL29018_CMD1_OPMODE_IR_ONCE); 254 if (ir_data < 0) 255 return ir_data; 256 257 if (prox_data >= ir_data) 258 *near_ir = prox_data - ir_data; 259 else 260 *near_ir = 0; 261 262 return 0; 263 } 264 265 static ssize_t in_illuminance_scale_available_show 266 (struct device *dev, struct device_attribute *attr, 267 char *buf) 268 { 269 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 270 struct isl29018_chip *chip = iio_priv(indio_dev); 271 unsigned int i; 272 int len = 0; 273 274 mutex_lock(&chip->lock); 275 for (i = 0; i < ARRAY_SIZE(isl29018_scales[chip->int_time]); ++i) 276 len += sprintf(buf + len, "%d.%06d ", 277 isl29018_scales[chip->int_time][i].scale, 278 isl29018_scales[chip->int_time][i].uscale); 279 mutex_unlock(&chip->lock); 280 281 buf[len - 1] = '\n'; 282 283 return len; 284 } 285 286 static ssize_t in_illuminance_integration_time_available_show 287 (struct device *dev, struct device_attribute *attr, 288 char *buf) 289 { 290 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 291 struct isl29018_chip *chip = iio_priv(indio_dev); 292 unsigned int i; 293 int len = 0; 294 295 for (i = 0; i < ARRAY_SIZE(isl29018_int_utimes[chip->type]); ++i) 296 len += sprintf(buf + len, "0.%06d ", 297 isl29018_int_utimes[chip->type][i]); 298 299 buf[len - 1] = '\n'; 300 301 return len; 302 } 303 304 /* 305 * From ISL29018 Data Sheet (FN6619.4, Oct 8, 2012) regarding the 306 * infrared suppression: 307 * 308 * Proximity Sensing Scheme: Bit 7. This bit programs the function 309 * of the proximity detection. Logic 0 of this bit, Scheme 0, makes 310 * full n (4, 8, 12, 16) bits (unsigned) proximity detection. The range 311 * of Scheme 0 proximity count is from 0 to 2^n. Logic 1 of this bit, 312 * Scheme 1, makes n-1 (3, 7, 11, 15) bits (2's complementary) 313 * proximity_less_ambient detection. The range of Scheme 1 314 * proximity count is from -2^(n-1) to 2^(n-1) . The sign bit is extended 315 * for resolutions less than 16. While Scheme 0 has wider dynamic 316 * range, Scheme 1 proximity detection is less affected by the 317 * ambient IR noise variation. 318 * 319 * 0 Sensing IR from LED and ambient 320 * 1 Sensing IR from LED with ambient IR rejection 321 */ 322 static ssize_t proximity_on_chip_ambient_infrared_suppression_show 323 (struct device *dev, struct device_attribute *attr, 324 char *buf) 325 { 326 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 327 struct isl29018_chip *chip = iio_priv(indio_dev); 328 329 /* 330 * Return the "proximity scheme" i.e. if the chip does on chip 331 * infrared suppression (1 means perform on chip suppression) 332 */ 333 return sprintf(buf, "%d\n", chip->prox_scheme); 334 } 335 336 static ssize_t proximity_on_chip_ambient_infrared_suppression_store 337 (struct device *dev, struct device_attribute *attr, 338 const char *buf, size_t count) 339 { 340 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 341 struct isl29018_chip *chip = iio_priv(indio_dev); 342 int val; 343 344 if (kstrtoint(buf, 10, &val)) 345 return -EINVAL; 346 if (!(val == 0 || val == 1)) 347 return -EINVAL; 348 349 /* 350 * Get the "proximity scheme" i.e. if the chip does on chip 351 * infrared suppression (1 means perform on chip suppression) 352 */ 353 mutex_lock(&chip->lock); 354 chip->prox_scheme = val; 355 mutex_unlock(&chip->lock); 356 357 return count; 358 } 359 360 static int isl29018_write_raw(struct iio_dev *indio_dev, 361 struct iio_chan_spec const *chan, 362 int val, 363 int val2, 364 long mask) 365 { 366 struct isl29018_chip *chip = iio_priv(indio_dev); 367 int ret = -EINVAL; 368 369 mutex_lock(&chip->lock); 370 if (chip->suspended) { 371 ret = -EBUSY; 372 goto write_done; 373 } 374 switch (mask) { 375 case IIO_CHAN_INFO_CALIBSCALE: 376 if (chan->type == IIO_LIGHT) { 377 chip->calibscale = val; 378 chip->ucalibscale = val2; 379 ret = 0; 380 } 381 break; 382 case IIO_CHAN_INFO_INT_TIME: 383 if (chan->type == IIO_LIGHT && !val) 384 ret = isl29018_set_integration_time(chip, val2); 385 break; 386 case IIO_CHAN_INFO_SCALE: 387 if (chan->type == IIO_LIGHT) 388 ret = isl29018_set_scale(chip, val, val2); 389 break; 390 default: 391 break; 392 } 393 394 write_done: 395 mutex_unlock(&chip->lock); 396 397 return ret; 398 } 399 400 static int isl29018_read_raw(struct iio_dev *indio_dev, 401 struct iio_chan_spec const *chan, 402 int *val, 403 int *val2, 404 long mask) 405 { 406 int ret = -EINVAL; 407 struct isl29018_chip *chip = iio_priv(indio_dev); 408 409 mutex_lock(&chip->lock); 410 if (chip->suspended) { 411 ret = -EBUSY; 412 goto read_done; 413 } 414 switch (mask) { 415 case IIO_CHAN_INFO_RAW: 416 case IIO_CHAN_INFO_PROCESSED: 417 switch (chan->type) { 418 case IIO_LIGHT: 419 ret = isl29018_read_lux(chip, val); 420 break; 421 case IIO_INTENSITY: 422 ret = isl29018_read_ir(chip, val); 423 break; 424 case IIO_PROXIMITY: 425 ret = isl29018_read_proximity_ir(chip, 426 chip->prox_scheme, 427 val); 428 break; 429 default: 430 break; 431 } 432 if (!ret) 433 ret = IIO_VAL_INT; 434 break; 435 case IIO_CHAN_INFO_INT_TIME: 436 if (chan->type == IIO_LIGHT) { 437 *val = 0; 438 *val2 = isl29018_int_utimes[chip->type][chip->int_time]; 439 ret = IIO_VAL_INT_PLUS_MICRO; 440 } 441 break; 442 case IIO_CHAN_INFO_SCALE: 443 if (chan->type == IIO_LIGHT) { 444 *val = chip->scale.scale; 445 *val2 = chip->scale.uscale; 446 ret = IIO_VAL_INT_PLUS_MICRO; 447 } 448 break; 449 case IIO_CHAN_INFO_CALIBSCALE: 450 if (chan->type == IIO_LIGHT) { 451 *val = chip->calibscale; 452 *val2 = chip->ucalibscale; 453 ret = IIO_VAL_INT_PLUS_MICRO; 454 } 455 break; 456 default: 457 break; 458 } 459 460 read_done: 461 mutex_unlock(&chip->lock); 462 463 return ret; 464 } 465 466 #define ISL29018_LIGHT_CHANNEL { \ 467 .type = IIO_LIGHT, \ 468 .indexed = 1, \ 469 .channel = 0, \ 470 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) | \ 471 BIT(IIO_CHAN_INFO_CALIBSCALE) | \ 472 BIT(IIO_CHAN_INFO_SCALE) | \ 473 BIT(IIO_CHAN_INFO_INT_TIME), \ 474 } 475 476 #define ISL29018_IR_CHANNEL { \ 477 .type = IIO_INTENSITY, \ 478 .modified = 1, \ 479 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ 480 .channel2 = IIO_MOD_LIGHT_IR, \ 481 } 482 483 #define ISL29018_PROXIMITY_CHANNEL { \ 484 .type = IIO_PROXIMITY, \ 485 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ 486 } 487 488 static const struct iio_chan_spec isl29018_channels[] = { 489 ISL29018_LIGHT_CHANNEL, 490 ISL29018_IR_CHANNEL, 491 ISL29018_PROXIMITY_CHANNEL, 492 }; 493 494 static const struct iio_chan_spec isl29023_channels[] = { 495 ISL29018_LIGHT_CHANNEL, 496 ISL29018_IR_CHANNEL, 497 }; 498 499 static IIO_DEVICE_ATTR_RO(in_illuminance_integration_time_available, 0); 500 static IIO_DEVICE_ATTR_RO(in_illuminance_scale_available, 0); 501 static IIO_DEVICE_ATTR_RW(proximity_on_chip_ambient_infrared_suppression, 0); 502 503 #define ISL29018_DEV_ATTR(name) (&iio_dev_attr_##name.dev_attr.attr) 504 505 static struct attribute *isl29018_attributes[] = { 506 ISL29018_DEV_ATTR(in_illuminance_scale_available), 507 ISL29018_DEV_ATTR(in_illuminance_integration_time_available), 508 ISL29018_DEV_ATTR(proximity_on_chip_ambient_infrared_suppression), 509 NULL 510 }; 511 512 static struct attribute *isl29023_attributes[] = { 513 ISL29018_DEV_ATTR(in_illuminance_scale_available), 514 ISL29018_DEV_ATTR(in_illuminance_integration_time_available), 515 NULL 516 }; 517 518 static const struct attribute_group isl29018_group = { 519 .attrs = isl29018_attributes, 520 }; 521 522 static const struct attribute_group isl29023_group = { 523 .attrs = isl29023_attributes, 524 }; 525 526 enum { 527 isl29018, 528 isl29023, 529 isl29035, 530 }; 531 532 static int isl29018_chip_init(struct isl29018_chip *chip) 533 { 534 int status; 535 struct device *dev = regmap_get_device(chip->regmap); 536 537 if (chip->type == isl29035) { 538 unsigned int id; 539 540 status = regmap_read(chip->regmap, ISL29035_REG_DEVICE_ID, &id); 541 if (status < 0) { 542 dev_err(dev, 543 "Error reading ID register with error %d\n", 544 status); 545 return status; 546 } 547 548 id = (id & ISL29035_DEVICE_ID_MASK) >> ISL29035_DEVICE_ID_SHIFT; 549 550 if (id != ISL29035_DEVICE_ID) 551 return -ENODEV; 552 553 /* Clear brownout bit */ 554 status = regmap_clear_bits(chip->regmap, 555 ISL29035_REG_DEVICE_ID, 556 ISL29035_BOUT_MASK); 557 if (status < 0) 558 return status; 559 } 560 561 /* 562 * Code added per Intersil Application Note 1534: 563 * When VDD sinks to approximately 1.8V or below, some of 564 * the part's registers may change their state. When VDD 565 * recovers to 2.25V (or greater), the part may thus be in an 566 * unknown mode of operation. The user can return the part to 567 * a known mode of operation either by (a) setting VDD = 0V for 568 * 1 second or more and then powering back up with a slew rate 569 * of 0.5V/ms or greater, or (b) via I2C disable all ALS/PROX 570 * conversions, clear the test registers, and then rewrite all 571 * registers to the desired values. 572 * ... 573 * For ISL29011, ISL29018, ISL29021, ISL29023 574 * 1. Write 0x00 to register 0x08 (TEST) 575 * 2. Write 0x00 to register 0x00 (CMD1) 576 * 3. Rewrite all registers to the desired values 577 * 578 * ISL29018 Data Sheet (FN6619.1, Feb 11, 2010) essentially says 579 * the same thing EXCEPT the data sheet asks for a 1ms delay after 580 * writing the CMD1 register. 581 */ 582 status = regmap_write(chip->regmap, ISL29018_REG_TEST, 0x0); 583 if (status < 0) { 584 dev_err(dev, "Failed to clear isl29018 TEST reg.(%d)\n", 585 status); 586 return status; 587 } 588 589 /* 590 * See Intersil AN1534 comments above. 591 * "Operating Mode" (COMMAND1) register is reprogrammed when 592 * data is read from the device. 593 */ 594 status = regmap_write(chip->regmap, ISL29018_REG_ADD_COMMAND1, 0); 595 if (status < 0) { 596 dev_err(dev, "Failed to clear isl29018 CMD1 reg.(%d)\n", 597 status); 598 return status; 599 } 600 601 usleep_range(1000, 2000); /* per data sheet, page 10 */ 602 603 /* Set defaults */ 604 status = isl29018_set_scale(chip, chip->scale.scale, 605 chip->scale.uscale); 606 if (status < 0) { 607 dev_err(dev, "Init of isl29018 fails\n"); 608 return status; 609 } 610 611 status = isl29018_set_integration_time(chip, 612 isl29018_int_utimes[chip->type][chip->int_time]); 613 if (status < 0) 614 dev_err(dev, "Init of isl29018 fails\n"); 615 616 return status; 617 } 618 619 static const struct iio_info isl29018_info = { 620 .attrs = &isl29018_group, 621 .read_raw = isl29018_read_raw, 622 .write_raw = isl29018_write_raw, 623 }; 624 625 static const struct iio_info isl29023_info = { 626 .attrs = &isl29023_group, 627 .read_raw = isl29018_read_raw, 628 .write_raw = isl29018_write_raw, 629 }; 630 631 static bool isl29018_is_volatile_reg(struct device *dev, unsigned int reg) 632 { 633 switch (reg) { 634 case ISL29018_REG_ADD_DATA_LSB: 635 case ISL29018_REG_ADD_DATA_MSB: 636 case ISL29018_REG_ADD_COMMAND1: 637 case ISL29018_REG_TEST: 638 case ISL29035_REG_DEVICE_ID: 639 return true; 640 default: 641 return false; 642 } 643 } 644 645 static const struct regmap_config isl29018_regmap_config = { 646 .reg_bits = 8, 647 .val_bits = 8, 648 .volatile_reg = isl29018_is_volatile_reg, 649 .max_register = ISL29018_REG_TEST, 650 .num_reg_defaults_raw = ISL29018_REG_TEST + 1, 651 .cache_type = REGCACHE_RBTREE, 652 }; 653 654 static const struct regmap_config isl29035_regmap_config = { 655 .reg_bits = 8, 656 .val_bits = 8, 657 .volatile_reg = isl29018_is_volatile_reg, 658 .max_register = ISL29035_REG_DEVICE_ID, 659 .num_reg_defaults_raw = ISL29035_REG_DEVICE_ID + 1, 660 .cache_type = REGCACHE_RBTREE, 661 }; 662 663 struct isl29018_chip_info { 664 const struct iio_chan_spec *channels; 665 int num_channels; 666 const struct iio_info *indio_info; 667 const struct regmap_config *regmap_cfg; 668 }; 669 670 static const struct isl29018_chip_info isl29018_chip_info_tbl[] = { 671 [isl29018] = { 672 .channels = isl29018_channels, 673 .num_channels = ARRAY_SIZE(isl29018_channels), 674 .indio_info = &isl29018_info, 675 .regmap_cfg = &isl29018_regmap_config, 676 }, 677 [isl29023] = { 678 .channels = isl29023_channels, 679 .num_channels = ARRAY_SIZE(isl29023_channels), 680 .indio_info = &isl29023_info, 681 .regmap_cfg = &isl29018_regmap_config, 682 }, 683 [isl29035] = { 684 .channels = isl29023_channels, 685 .num_channels = ARRAY_SIZE(isl29023_channels), 686 .indio_info = &isl29023_info, 687 .regmap_cfg = &isl29035_regmap_config, 688 }, 689 }; 690 691 static void isl29018_disable_regulator_action(void *_data) 692 { 693 struct isl29018_chip *chip = _data; 694 int err; 695 696 err = regulator_disable(chip->vcc_reg); 697 if (err) 698 pr_err("failed to disable isl29018's VCC regulator!\n"); 699 } 700 701 static int isl29018_probe(struct i2c_client *client) 702 { 703 const struct i2c_device_id *id = i2c_client_get_device_id(client); 704 struct isl29018_chip *chip; 705 struct iio_dev *indio_dev; 706 const void *ddata = NULL; 707 const char *name; 708 int dev_id; 709 int err; 710 711 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip)); 712 if (!indio_dev) 713 return -ENOMEM; 714 715 chip = iio_priv(indio_dev); 716 717 i2c_set_clientdata(client, indio_dev); 718 719 if (id) { 720 name = id->name; 721 dev_id = id->driver_data; 722 } else { 723 name = iio_get_acpi_device_name_and_data(&client->dev, &ddata); 724 dev_id = (intptr_t)ddata; 725 } 726 727 mutex_init(&chip->lock); 728 729 chip->type = dev_id; 730 chip->calibscale = 1; 731 chip->ucalibscale = 0; 732 chip->int_time = ISL29018_INT_TIME_16; 733 chip->scale = isl29018_scales[chip->int_time][0]; 734 chip->suspended = false; 735 736 chip->vcc_reg = devm_regulator_get(&client->dev, "vcc"); 737 if (IS_ERR(chip->vcc_reg)) 738 return dev_err_probe(&client->dev, PTR_ERR(chip->vcc_reg), 739 "failed to get VCC regulator!\n"); 740 741 err = regulator_enable(chip->vcc_reg); 742 if (err) { 743 dev_err(&client->dev, "failed to enable VCC regulator!\n"); 744 return err; 745 } 746 747 err = devm_add_action_or_reset(&client->dev, isl29018_disable_regulator_action, 748 chip); 749 if (err) { 750 dev_err(&client->dev, "failed to setup regulator cleanup action!\n"); 751 return err; 752 } 753 754 chip->regmap = devm_regmap_init_i2c(client, 755 isl29018_chip_info_tbl[dev_id].regmap_cfg); 756 if (IS_ERR(chip->regmap)) { 757 err = PTR_ERR(chip->regmap); 758 dev_err(&client->dev, "regmap initialization fails: %d\n", err); 759 return err; 760 } 761 762 err = isl29018_chip_init(chip); 763 if (err) 764 return err; 765 766 indio_dev->info = isl29018_chip_info_tbl[dev_id].indio_info; 767 indio_dev->channels = isl29018_chip_info_tbl[dev_id].channels; 768 indio_dev->num_channels = isl29018_chip_info_tbl[dev_id].num_channels; 769 indio_dev->name = name; 770 indio_dev->modes = INDIO_DIRECT_MODE; 771 772 return devm_iio_device_register(&client->dev, indio_dev); 773 } 774 775 static int isl29018_suspend(struct device *dev) 776 { 777 struct isl29018_chip *chip = iio_priv(dev_get_drvdata(dev)); 778 int ret; 779 780 mutex_lock(&chip->lock); 781 782 /* 783 * Since this driver uses only polling commands, we are by default in 784 * auto shutdown (ie, power-down) mode. 785 * So we do not have much to do here. 786 */ 787 chip->suspended = true; 788 ret = regulator_disable(chip->vcc_reg); 789 if (ret) 790 dev_err(dev, "failed to disable VCC regulator\n"); 791 792 mutex_unlock(&chip->lock); 793 794 return ret; 795 } 796 797 static int isl29018_resume(struct device *dev) 798 { 799 struct isl29018_chip *chip = iio_priv(dev_get_drvdata(dev)); 800 int err; 801 802 mutex_lock(&chip->lock); 803 804 err = regulator_enable(chip->vcc_reg); 805 if (err) { 806 dev_err(dev, "failed to enable VCC regulator\n"); 807 mutex_unlock(&chip->lock); 808 return err; 809 } 810 811 err = isl29018_chip_init(chip); 812 if (!err) 813 chip->suspended = false; 814 815 mutex_unlock(&chip->lock); 816 817 return err; 818 } 819 820 static DEFINE_SIMPLE_DEV_PM_OPS(isl29018_pm_ops, isl29018_suspend, 821 isl29018_resume); 822 823 static const struct acpi_device_id isl29018_acpi_match[] = { 824 {"ISL29018", isl29018}, 825 {"ISL29023", isl29023}, 826 {"ISL29035", isl29035}, 827 {} 828 }; 829 MODULE_DEVICE_TABLE(acpi, isl29018_acpi_match); 830 831 static const struct i2c_device_id isl29018_id[] = { 832 {"isl29018", isl29018}, 833 {"isl29023", isl29023}, 834 {"isl29035", isl29035}, 835 {} 836 }; 837 MODULE_DEVICE_TABLE(i2c, isl29018_id); 838 839 static const struct of_device_id isl29018_of_match[] = { 840 { .compatible = "isil,isl29018", }, 841 { .compatible = "isil,isl29023", }, 842 { .compatible = "isil,isl29035", }, 843 { } 844 }; 845 MODULE_DEVICE_TABLE(of, isl29018_of_match); 846 847 static struct i2c_driver isl29018_driver = { 848 .driver = { 849 .name = "isl29018", 850 .acpi_match_table = isl29018_acpi_match, 851 .pm = pm_sleep_ptr(&isl29018_pm_ops), 852 .of_match_table = isl29018_of_match, 853 }, 854 .probe = isl29018_probe, 855 .id_table = isl29018_id, 856 }; 857 module_i2c_driver(isl29018_driver); 858 859 MODULE_DESCRIPTION("ISL29018 Ambient Light Sensor driver"); 860 MODULE_LICENSE("GPL"); 861