1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Support for Lite-On LTR501 and similar ambient light and proximity sensors. 4 * 5 * Copyright 2014 Peter Meerwald <pmeerw@pmeerw.net> 6 * 7 * 7-bit I2C slave address 0x23 8 * 9 * TODO: IR LED characteristics 10 */ 11 12 #include <linux/module.h> 13 #include <linux/i2c.h> 14 #include <linux/err.h> 15 #include <linux/delay.h> 16 #include <linux/regmap.h> 17 #include <linux/regulator/consumer.h> 18 19 #include <linux/iio/iio.h> 20 #include <linux/iio/events.h> 21 #include <linux/iio/sysfs.h> 22 #include <linux/iio/trigger_consumer.h> 23 #include <linux/iio/buffer.h> 24 #include <linux/iio/triggered_buffer.h> 25 26 #define LTR501_ALS_CONTR 0x80 /* ALS operation mode, SW reset */ 27 #define LTR501_PS_CONTR 0x81 /* PS operation mode */ 28 #define LTR501_PS_MEAS_RATE 0x84 /* measurement rate*/ 29 #define LTR501_ALS_MEAS_RATE 0x85 /* ALS integ time, measurement rate*/ 30 #define LTR501_PART_ID 0x86 31 #define LTR501_MANUFAC_ID 0x87 32 #define LTR501_ALS_DATA1 0x88 /* 16-bit, little endian */ 33 #define LTR501_ALS_DATA1_UPPER 0x89 /* upper 8 bits of LTR501_ALS_DATA1 */ 34 #define LTR501_ALS_DATA0 0x8a /* 16-bit, little endian */ 35 #define LTR501_ALS_DATA0_UPPER 0x8b /* upper 8 bits of LTR501_ALS_DATA0 */ 36 #define LTR501_ALS_PS_STATUS 0x8c 37 #define LTR501_PS_DATA 0x8d /* 16-bit, little endian */ 38 #define LTR501_PS_DATA_UPPER 0x8e /* upper 8 bits of LTR501_PS_DATA */ 39 #define LTR501_INTR 0x8f /* output mode, polarity, mode */ 40 #define LTR501_PS_THRESH_UP 0x90 /* 11 bit, ps upper threshold */ 41 #define LTR501_PS_THRESH_LOW 0x92 /* 11 bit, ps lower threshold */ 42 #define LTR501_ALS_THRESH_UP 0x97 /* 16 bit, ALS upper threshold */ 43 #define LTR501_ALS_THRESH_LOW 0x99 /* 16 bit, ALS lower threshold */ 44 #define LTR501_INTR_PRST 0x9e /* ps thresh, als thresh */ 45 #define LTR501_MAX_REG 0x9f 46 47 #define LTR501_ALS_CONTR_SW_RESET BIT(2) 48 #define LTR501_CONTR_PS_GAIN_MASK (BIT(3) | BIT(2)) 49 #define LTR501_CONTR_PS_GAIN_SHIFT 2 50 #define LTR501_CONTR_ALS_GAIN_MASK BIT(3) 51 #define LTR501_CONTR_ACTIVE BIT(1) 52 53 #define LTR501_STATUS_ALS_INTR BIT(3) 54 #define LTR501_STATUS_ALS_RDY BIT(2) 55 #define LTR501_STATUS_PS_INTR BIT(1) 56 #define LTR501_STATUS_PS_RDY BIT(0) 57 58 #define LTR501_PS_DATA_MASK 0x7ff 59 #define LTR501_PS_THRESH_MASK 0x7ff 60 #define LTR501_ALS_THRESH_MASK 0xffff 61 62 #define LTR501_ALS_DEF_PERIOD 500000 63 #define LTR501_PS_DEF_PERIOD 100000 64 65 #define LTR501_LUX_CONV(vis_coeff, vis_data, ir_coeff, ir_data) \ 66 ((vis_coeff * vis_data) - (ir_coeff * ir_data)) 67 68 static const int int_time_mapping[] = {100000, 50000, 200000, 400000}; 69 70 static const struct reg_field reg_field_it = 71 REG_FIELD(LTR501_ALS_MEAS_RATE, 3, 4); 72 static const struct reg_field reg_field_als_intr = 73 REG_FIELD(LTR501_INTR, 1, 1); 74 static const struct reg_field reg_field_ps_intr = 75 REG_FIELD(LTR501_INTR, 0, 0); 76 static const struct reg_field reg_field_als_rate = 77 REG_FIELD(LTR501_ALS_MEAS_RATE, 0, 2); 78 static const struct reg_field reg_field_ps_rate = 79 REG_FIELD(LTR501_PS_MEAS_RATE, 0, 3); 80 static const struct reg_field reg_field_als_prst = 81 REG_FIELD(LTR501_INTR_PRST, 0, 3); 82 static const struct reg_field reg_field_ps_prst = 83 REG_FIELD(LTR501_INTR_PRST, 4, 7); 84 85 struct ltr501_samp_table { 86 int freq_val; /* repetition frequency in micro HZ*/ 87 int time_val; /* repetition rate in micro seconds */ 88 }; 89 90 #define LTR501_RESERVED_GAIN -1 91 92 enum { 93 ltr501 = 0, 94 ltr559, 95 ltr301, 96 ltr303, 97 }; 98 99 struct ltr501_gain { 100 int scale; 101 int uscale; 102 }; 103 104 static const struct ltr501_gain ltr501_als_gain_tbl[] = { 105 {1, 0}, 106 {0, 5000}, 107 }; 108 109 static const struct ltr501_gain ltr559_als_gain_tbl[] = { 110 {1, 0}, 111 {0, 500000}, 112 {0, 250000}, 113 {0, 125000}, 114 {LTR501_RESERVED_GAIN, LTR501_RESERVED_GAIN}, 115 {LTR501_RESERVED_GAIN, LTR501_RESERVED_GAIN}, 116 {0, 20000}, 117 {0, 10000}, 118 }; 119 120 static const struct ltr501_gain ltr501_ps_gain_tbl[] = { 121 {1, 0}, 122 {0, 250000}, 123 {0, 125000}, 124 {0, 62500}, 125 }; 126 127 static const struct ltr501_gain ltr559_ps_gain_tbl[] = { 128 {0, 62500}, /* x16 gain */ 129 {0, 31250}, /* x32 gain */ 130 {0, 15625}, /* bits X1 are for x64 gain */ 131 {0, 15624}, 132 }; 133 134 struct ltr501_chip_info { 135 u8 partid; 136 const struct ltr501_gain *als_gain; 137 int als_gain_tbl_size; 138 const struct ltr501_gain *ps_gain; 139 int ps_gain_tbl_size; 140 u8 als_mode_active; 141 u8 als_gain_mask; 142 u8 als_gain_shift; 143 struct iio_chan_spec const *channels; 144 const int no_channels; 145 const struct iio_info *info; 146 const struct iio_info *info_no_irq; 147 }; 148 149 struct ltr501_data { 150 struct i2c_client *client; 151 struct mutex lock_als, lock_ps; 152 const struct ltr501_chip_info *chip_info; 153 u8 als_contr, ps_contr; 154 int als_period, ps_period; /* period in micro seconds */ 155 struct regmap *regmap; 156 struct regmap_field *reg_it; 157 struct regmap_field *reg_als_intr; 158 struct regmap_field *reg_ps_intr; 159 struct regmap_field *reg_als_rate; 160 struct regmap_field *reg_ps_rate; 161 struct regmap_field *reg_als_prst; 162 struct regmap_field *reg_ps_prst; 163 uint32_t near_level; 164 }; 165 166 static const struct ltr501_samp_table ltr501_als_samp_table[] = { 167 {20000000, 50000}, {10000000, 100000}, 168 {5000000, 200000}, {2000000, 500000}, 169 {1000000, 1000000}, {500000, 2000000}, 170 {500000, 2000000}, {500000, 2000000} 171 }; 172 173 static const struct ltr501_samp_table ltr501_ps_samp_table[] = { 174 {20000000, 50000}, {14285714, 70000}, 175 {10000000, 100000}, {5000000, 200000}, 176 {2000000, 500000}, {1000000, 1000000}, 177 {500000, 2000000}, {500000, 2000000}, 178 {500000, 2000000} 179 }; 180 181 static int ltr501_match_samp_freq(const struct ltr501_samp_table *tab, 182 int len, int val, int val2) 183 { 184 int i, freq; 185 186 freq = val * 1000000 + val2; 187 188 for (i = 0; i < len; i++) { 189 if (tab[i].freq_val == freq) 190 return i; 191 } 192 193 return -EINVAL; 194 } 195 196 static int ltr501_als_read_samp_freq(const struct ltr501_data *data, 197 int *val, int *val2) 198 { 199 int ret, i; 200 201 ret = regmap_field_read(data->reg_als_rate, &i); 202 if (ret < 0) 203 return ret; 204 205 if (i < 0 || i >= ARRAY_SIZE(ltr501_als_samp_table)) 206 return -EINVAL; 207 208 *val = ltr501_als_samp_table[i].freq_val / 1000000; 209 *val2 = ltr501_als_samp_table[i].freq_val % 1000000; 210 211 return IIO_VAL_INT_PLUS_MICRO; 212 } 213 214 static int ltr501_ps_read_samp_freq(const struct ltr501_data *data, 215 int *val, int *val2) 216 { 217 int ret, i; 218 219 ret = regmap_field_read(data->reg_ps_rate, &i); 220 if (ret < 0) 221 return ret; 222 223 if (i < 0 || i >= ARRAY_SIZE(ltr501_ps_samp_table)) 224 return -EINVAL; 225 226 *val = ltr501_ps_samp_table[i].freq_val / 1000000; 227 *val2 = ltr501_ps_samp_table[i].freq_val % 1000000; 228 229 return IIO_VAL_INT_PLUS_MICRO; 230 } 231 232 static int ltr501_als_write_samp_freq(struct ltr501_data *data, 233 int val, int val2) 234 { 235 int i, ret; 236 237 i = ltr501_match_samp_freq(ltr501_als_samp_table, 238 ARRAY_SIZE(ltr501_als_samp_table), 239 val, val2); 240 241 if (i < 0) 242 return i; 243 244 mutex_lock(&data->lock_als); 245 ret = regmap_field_write(data->reg_als_rate, i); 246 mutex_unlock(&data->lock_als); 247 248 return ret; 249 } 250 251 static int ltr501_ps_write_samp_freq(struct ltr501_data *data, 252 int val, int val2) 253 { 254 int i, ret; 255 256 i = ltr501_match_samp_freq(ltr501_ps_samp_table, 257 ARRAY_SIZE(ltr501_ps_samp_table), 258 val, val2); 259 260 if (i < 0) 261 return i; 262 263 mutex_lock(&data->lock_ps); 264 ret = regmap_field_write(data->reg_ps_rate, i); 265 mutex_unlock(&data->lock_ps); 266 267 return ret; 268 } 269 270 static int ltr501_als_read_samp_period(const struct ltr501_data *data, int *val) 271 { 272 int ret, i; 273 274 ret = regmap_field_read(data->reg_als_rate, &i); 275 if (ret < 0) 276 return ret; 277 278 if (i < 0 || i >= ARRAY_SIZE(ltr501_als_samp_table)) 279 return -EINVAL; 280 281 *val = ltr501_als_samp_table[i].time_val; 282 283 return IIO_VAL_INT; 284 } 285 286 static int ltr501_ps_read_samp_period(const struct ltr501_data *data, int *val) 287 { 288 int ret, i; 289 290 ret = regmap_field_read(data->reg_ps_rate, &i); 291 if (ret < 0) 292 return ret; 293 294 if (i < 0 || i >= ARRAY_SIZE(ltr501_ps_samp_table)) 295 return -EINVAL; 296 297 *val = ltr501_ps_samp_table[i].time_val; 298 299 return IIO_VAL_INT; 300 } 301 302 /* IR and visible spectrum coeff's are given in data sheet */ 303 static unsigned long ltr501_calculate_lux(u16 vis_data, u16 ir_data) 304 { 305 unsigned long ratio, lux; 306 307 if (vis_data == 0) 308 return 0; 309 310 /* multiply numerator by 100 to avoid handling ratio < 1 */ 311 ratio = DIV_ROUND_UP(ir_data * 100, ir_data + vis_data); 312 313 if (ratio < 45) 314 lux = LTR501_LUX_CONV(1774, vis_data, -1105, ir_data); 315 else if (ratio >= 45 && ratio < 64) 316 lux = LTR501_LUX_CONV(3772, vis_data, 1336, ir_data); 317 else if (ratio >= 64 && ratio < 85) 318 lux = LTR501_LUX_CONV(1690, vis_data, 169, ir_data); 319 else 320 lux = 0; 321 322 return lux / 1000; 323 } 324 325 static int ltr501_drdy(const struct ltr501_data *data, u8 drdy_mask) 326 { 327 int tries = 100; 328 int ret, status; 329 330 while (tries--) { 331 ret = regmap_read(data->regmap, LTR501_ALS_PS_STATUS, &status); 332 if (ret < 0) 333 return ret; 334 if ((status & drdy_mask) == drdy_mask) 335 return 0; 336 msleep(25); 337 } 338 339 dev_err(&data->client->dev, "ltr501_drdy() failed, data not ready\n"); 340 return -EIO; 341 } 342 343 static int ltr501_set_it_time(struct ltr501_data *data, int it) 344 { 345 int ret, i, index = -1, status; 346 347 for (i = 0; i < ARRAY_SIZE(int_time_mapping); i++) { 348 if (int_time_mapping[i] == it) { 349 index = i; 350 break; 351 } 352 } 353 /* Make sure integ time index is valid */ 354 if (index < 0) 355 return -EINVAL; 356 357 ret = regmap_read(data->regmap, LTR501_ALS_CONTR, &status); 358 if (ret < 0) 359 return ret; 360 361 if (status & LTR501_CONTR_ALS_GAIN_MASK) { 362 /* 363 * 200 ms and 400 ms integ time can only be 364 * used in dynamic range 1 365 */ 366 if (index > 1) 367 return -EINVAL; 368 } else 369 /* 50 ms integ time can only be used in dynamic range 2 */ 370 if (index == 1) 371 return -EINVAL; 372 373 return regmap_field_write(data->reg_it, index); 374 } 375 376 /* read int time in micro seconds */ 377 static int ltr501_read_it_time(const struct ltr501_data *data, 378 int *val, int *val2) 379 { 380 int ret, index; 381 382 ret = regmap_field_read(data->reg_it, &index); 383 if (ret < 0) 384 return ret; 385 386 /* Make sure integ time index is valid */ 387 if (index < 0 || index >= ARRAY_SIZE(int_time_mapping)) 388 return -EINVAL; 389 390 *val2 = int_time_mapping[index]; 391 *val = 0; 392 393 return IIO_VAL_INT_PLUS_MICRO; 394 } 395 396 static int ltr501_read_als(const struct ltr501_data *data, __le16 buf[2]) 397 { 398 int ret; 399 400 ret = ltr501_drdy(data, LTR501_STATUS_ALS_RDY); 401 if (ret < 0) 402 return ret; 403 /* always read both ALS channels in given order */ 404 return regmap_bulk_read(data->regmap, LTR501_ALS_DATA1, 405 buf, 2 * sizeof(__le16)); 406 } 407 408 static int ltr501_read_ps(const struct ltr501_data *data) 409 { 410 __le16 status; 411 int ret; 412 413 ret = ltr501_drdy(data, LTR501_STATUS_PS_RDY); 414 if (ret < 0) 415 return ret; 416 417 ret = regmap_bulk_read(data->regmap, LTR501_PS_DATA, 418 &status, sizeof(status)); 419 if (ret < 0) 420 return ret; 421 422 return le16_to_cpu(status); 423 } 424 425 static int ltr501_read_intr_prst(const struct ltr501_data *data, 426 enum iio_chan_type type, 427 int *val2) 428 { 429 int ret, samp_period, prst; 430 431 switch (type) { 432 case IIO_INTENSITY: 433 ret = regmap_field_read(data->reg_als_prst, &prst); 434 if (ret < 0) 435 return ret; 436 437 ret = ltr501_als_read_samp_period(data, &samp_period); 438 439 if (ret < 0) 440 return ret; 441 *val2 = samp_period * prst; 442 return IIO_VAL_INT_PLUS_MICRO; 443 case IIO_PROXIMITY: 444 ret = regmap_field_read(data->reg_ps_prst, &prst); 445 if (ret < 0) 446 return ret; 447 448 ret = ltr501_ps_read_samp_period(data, &samp_period); 449 450 if (ret < 0) 451 return ret; 452 453 *val2 = samp_period * prst; 454 return IIO_VAL_INT_PLUS_MICRO; 455 default: 456 return -EINVAL; 457 } 458 459 return -EINVAL; 460 } 461 462 static int ltr501_write_intr_prst(struct ltr501_data *data, 463 enum iio_chan_type type, 464 int val, int val2) 465 { 466 int ret, samp_period, new_val; 467 unsigned long period; 468 469 if (val < 0 || val2 < 0) 470 return -EINVAL; 471 472 /* period in microseconds */ 473 period = ((val * 1000000) + val2); 474 475 switch (type) { 476 case IIO_INTENSITY: 477 ret = ltr501_als_read_samp_period(data, &samp_period); 478 if (ret < 0) 479 return ret; 480 481 /* period should be atleast equal to sampling period */ 482 if (period < samp_period) 483 return -EINVAL; 484 485 new_val = DIV_ROUND_UP(period, samp_period); 486 if (new_val < 0 || new_val > 0x0f) 487 return -EINVAL; 488 489 mutex_lock(&data->lock_als); 490 ret = regmap_field_write(data->reg_als_prst, new_val); 491 mutex_unlock(&data->lock_als); 492 if (ret >= 0) 493 data->als_period = period; 494 495 return ret; 496 case IIO_PROXIMITY: 497 ret = ltr501_ps_read_samp_period(data, &samp_period); 498 if (ret < 0) 499 return ret; 500 501 /* period should be atleast equal to rate */ 502 if (period < samp_period) 503 return -EINVAL; 504 505 new_val = DIV_ROUND_UP(period, samp_period); 506 if (new_val < 0 || new_val > 0x0f) 507 return -EINVAL; 508 509 mutex_lock(&data->lock_ps); 510 ret = regmap_field_write(data->reg_ps_prst, new_val); 511 mutex_unlock(&data->lock_ps); 512 if (ret >= 0) 513 data->ps_period = period; 514 515 return ret; 516 default: 517 return -EINVAL; 518 } 519 520 return -EINVAL; 521 } 522 523 static ssize_t ltr501_read_near_level(struct iio_dev *indio_dev, 524 uintptr_t priv, 525 const struct iio_chan_spec *chan, 526 char *buf) 527 { 528 struct ltr501_data *data = iio_priv(indio_dev); 529 530 return sprintf(buf, "%u\n", data->near_level); 531 } 532 533 static const struct iio_chan_spec_ext_info ltr501_ext_info[] = { 534 { 535 .name = "nearlevel", 536 .shared = IIO_SEPARATE, 537 .read = ltr501_read_near_level, 538 }, 539 { } 540 }; 541 542 static const struct iio_event_spec ltr501_als_event_spec[] = { 543 { 544 .type = IIO_EV_TYPE_THRESH, 545 .dir = IIO_EV_DIR_RISING, 546 .mask_separate = BIT(IIO_EV_INFO_VALUE), 547 }, { 548 .type = IIO_EV_TYPE_THRESH, 549 .dir = IIO_EV_DIR_FALLING, 550 .mask_separate = BIT(IIO_EV_INFO_VALUE), 551 }, { 552 .type = IIO_EV_TYPE_THRESH, 553 .dir = IIO_EV_DIR_EITHER, 554 .mask_separate = BIT(IIO_EV_INFO_ENABLE) | 555 BIT(IIO_EV_INFO_PERIOD), 556 }, 557 558 }; 559 560 static const struct iio_event_spec ltr501_pxs_event_spec[] = { 561 { 562 .type = IIO_EV_TYPE_THRESH, 563 .dir = IIO_EV_DIR_RISING, 564 .mask_separate = BIT(IIO_EV_INFO_VALUE), 565 }, { 566 .type = IIO_EV_TYPE_THRESH, 567 .dir = IIO_EV_DIR_FALLING, 568 .mask_separate = BIT(IIO_EV_INFO_VALUE), 569 }, { 570 .type = IIO_EV_TYPE_THRESH, 571 .dir = IIO_EV_DIR_EITHER, 572 .mask_separate = BIT(IIO_EV_INFO_ENABLE) | 573 BIT(IIO_EV_INFO_PERIOD), 574 }, 575 }; 576 577 #define LTR501_INTENSITY_CHANNEL(_idx, _addr, _mod, _shared, \ 578 _evspec, _evsize) { \ 579 .type = IIO_INTENSITY, \ 580 .modified = 1, \ 581 .address = (_addr), \ 582 .channel2 = (_mod), \ 583 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ 584 .info_mask_shared_by_type = (_shared), \ 585 .scan_index = (_idx), \ 586 .scan_type = { \ 587 .sign = 'u', \ 588 .realbits = 16, \ 589 .storagebits = 16, \ 590 .endianness = IIO_CPU, \ 591 }, \ 592 .event_spec = _evspec,\ 593 .num_event_specs = _evsize,\ 594 } 595 596 #define LTR501_LIGHT_CHANNEL() { \ 597 .type = IIO_LIGHT, \ 598 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \ 599 .scan_index = -1, \ 600 } 601 602 static const struct iio_chan_spec ltr501_channels[] = { 603 LTR501_LIGHT_CHANNEL(), 604 LTR501_INTENSITY_CHANNEL(0, LTR501_ALS_DATA0, IIO_MOD_LIGHT_BOTH, 0, 605 ltr501_als_event_spec, 606 ARRAY_SIZE(ltr501_als_event_spec)), 607 LTR501_INTENSITY_CHANNEL(1, LTR501_ALS_DATA1, IIO_MOD_LIGHT_IR, 608 BIT(IIO_CHAN_INFO_SCALE) | 609 BIT(IIO_CHAN_INFO_INT_TIME) | 610 BIT(IIO_CHAN_INFO_SAMP_FREQ), 611 NULL, 0), 612 { 613 .type = IIO_PROXIMITY, 614 .address = LTR501_PS_DATA, 615 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 616 BIT(IIO_CHAN_INFO_SCALE), 617 .scan_index = 2, 618 .scan_type = { 619 .sign = 'u', 620 .realbits = 11, 621 .storagebits = 16, 622 .endianness = IIO_CPU, 623 }, 624 .event_spec = ltr501_pxs_event_spec, 625 .num_event_specs = ARRAY_SIZE(ltr501_pxs_event_spec), 626 .ext_info = ltr501_ext_info, 627 }, 628 IIO_CHAN_SOFT_TIMESTAMP(3), 629 }; 630 631 static const struct iio_chan_spec ltr301_channels[] = { 632 LTR501_LIGHT_CHANNEL(), 633 LTR501_INTENSITY_CHANNEL(0, LTR501_ALS_DATA0, IIO_MOD_LIGHT_BOTH, 0, 634 ltr501_als_event_spec, 635 ARRAY_SIZE(ltr501_als_event_spec)), 636 LTR501_INTENSITY_CHANNEL(1, LTR501_ALS_DATA1, IIO_MOD_LIGHT_IR, 637 BIT(IIO_CHAN_INFO_SCALE) | 638 BIT(IIO_CHAN_INFO_INT_TIME) | 639 BIT(IIO_CHAN_INFO_SAMP_FREQ), 640 NULL, 0), 641 IIO_CHAN_SOFT_TIMESTAMP(2), 642 }; 643 644 static int ltr501_read_info_raw(struct ltr501_data *data, 645 struct iio_chan_spec const *chan, 646 int *val) 647 { 648 __le16 buf[2]; 649 int ret; 650 651 switch (chan->type) { 652 case IIO_INTENSITY: 653 mutex_lock(&data->lock_als); 654 ret = ltr501_read_als(data, buf); 655 mutex_unlock(&data->lock_als); 656 if (ret < 0) 657 return ret; 658 *val = le16_to_cpu(chan->address == LTR501_ALS_DATA1 ? 659 buf[0] : buf[1]); 660 return IIO_VAL_INT; 661 case IIO_PROXIMITY: 662 mutex_lock(&data->lock_ps); 663 ret = ltr501_read_ps(data); 664 mutex_unlock(&data->lock_ps); 665 if (ret < 0) 666 return ret; 667 *val = ret & LTR501_PS_DATA_MASK; 668 return IIO_VAL_INT; 669 default: 670 return -EINVAL; 671 } 672 } 673 674 static int ltr501_read_raw(struct iio_dev *indio_dev, 675 struct iio_chan_spec const *chan, 676 int *val, int *val2, long mask) 677 { 678 struct ltr501_data *data = iio_priv(indio_dev); 679 __le16 buf[2]; 680 int ret, i; 681 682 switch (mask) { 683 case IIO_CHAN_INFO_PROCESSED: 684 switch (chan->type) { 685 case IIO_LIGHT: 686 if (!iio_device_claim_direct(indio_dev)) 687 return -EBUSY; 688 689 mutex_lock(&data->lock_als); 690 ret = ltr501_read_als(data, buf); 691 mutex_unlock(&data->lock_als); 692 iio_device_release_direct(indio_dev); 693 if (ret < 0) 694 return ret; 695 *val = ltr501_calculate_lux(le16_to_cpu(buf[1]), 696 le16_to_cpu(buf[0])); 697 return IIO_VAL_INT; 698 default: 699 return -EINVAL; 700 } 701 case IIO_CHAN_INFO_RAW: 702 if (!iio_device_claim_direct(indio_dev)) 703 return -EBUSY; 704 705 ret = ltr501_read_info_raw(data, chan, val); 706 707 iio_device_release_direct(indio_dev); 708 return ret; 709 710 case IIO_CHAN_INFO_SCALE: 711 switch (chan->type) { 712 case IIO_INTENSITY: 713 i = (data->als_contr & data->chip_info->als_gain_mask) 714 >> data->chip_info->als_gain_shift; 715 *val = data->chip_info->als_gain[i].scale; 716 *val2 = data->chip_info->als_gain[i].uscale; 717 return IIO_VAL_INT_PLUS_MICRO; 718 case IIO_PROXIMITY: 719 i = (data->ps_contr & LTR501_CONTR_PS_GAIN_MASK) >> 720 LTR501_CONTR_PS_GAIN_SHIFT; 721 *val = data->chip_info->ps_gain[i].scale; 722 *val2 = data->chip_info->ps_gain[i].uscale; 723 return IIO_VAL_INT_PLUS_MICRO; 724 default: 725 return -EINVAL; 726 } 727 case IIO_CHAN_INFO_INT_TIME: 728 switch (chan->type) { 729 case IIO_INTENSITY: 730 return ltr501_read_it_time(data, val, val2); 731 default: 732 return -EINVAL; 733 } 734 case IIO_CHAN_INFO_SAMP_FREQ: 735 switch (chan->type) { 736 case IIO_INTENSITY: 737 return ltr501_als_read_samp_freq(data, val, val2); 738 case IIO_PROXIMITY: 739 return ltr501_ps_read_samp_freq(data, val, val2); 740 default: 741 return -EINVAL; 742 } 743 } 744 return -EINVAL; 745 } 746 747 static int ltr501_get_gain_index(const struct ltr501_gain *gain, int size, 748 int val, int val2) 749 { 750 int i; 751 752 for (i = 0; i < size; i++) 753 if (val == gain[i].scale && val2 == gain[i].uscale) 754 return i; 755 756 return -EINVAL; 757 } 758 759 static int __ltr501_write_raw(struct iio_dev *indio_dev, 760 struct iio_chan_spec const *chan, 761 int val, int val2, long mask) 762 { 763 struct ltr501_data *data = iio_priv(indio_dev); 764 int i, ret, freq_val, freq_val2; 765 const struct ltr501_chip_info *info = data->chip_info; 766 767 switch (mask) { 768 case IIO_CHAN_INFO_SCALE: 769 switch (chan->type) { 770 case IIO_INTENSITY: 771 i = ltr501_get_gain_index(info->als_gain, 772 info->als_gain_tbl_size, 773 val, val2); 774 if (i < 0) 775 return i; 776 777 data->als_contr &= ~info->als_gain_mask; 778 data->als_contr |= i << info->als_gain_shift; 779 780 return regmap_write(data->regmap, LTR501_ALS_CONTR, 781 data->als_contr); 782 case IIO_PROXIMITY: 783 i = ltr501_get_gain_index(info->ps_gain, 784 info->ps_gain_tbl_size, 785 val, val2); 786 if (i < 0) 787 return i; 788 789 data->ps_contr &= ~LTR501_CONTR_PS_GAIN_MASK; 790 data->ps_contr |= i << LTR501_CONTR_PS_GAIN_SHIFT; 791 792 return regmap_write(data->regmap, LTR501_PS_CONTR, 793 data->ps_contr); 794 default: 795 return -EINVAL; 796 } 797 798 case IIO_CHAN_INFO_INT_TIME: 799 switch (chan->type) { 800 case IIO_INTENSITY: 801 if (val != 0) 802 return -EINVAL; 803 804 mutex_lock(&data->lock_als); 805 ret = ltr501_set_it_time(data, val2); 806 mutex_unlock(&data->lock_als); 807 return ret; 808 default: 809 return -EINVAL; 810 } 811 812 case IIO_CHAN_INFO_SAMP_FREQ: 813 switch (chan->type) { 814 case IIO_INTENSITY: 815 ret = ltr501_als_read_samp_freq(data, &freq_val, 816 &freq_val2); 817 if (ret < 0) 818 return ret; 819 820 ret = ltr501_als_write_samp_freq(data, val, val2); 821 if (ret < 0) 822 return ret; 823 824 /* update persistence count when changing frequency */ 825 ret = ltr501_write_intr_prst(data, chan->type, 826 0, data->als_period); 827 828 if (ret < 0) 829 /* Do not ovewrite error */ 830 ltr501_als_write_samp_freq(data, freq_val, 831 freq_val2); 832 return ret; 833 case IIO_PROXIMITY: 834 ret = ltr501_ps_read_samp_freq(data, &freq_val, 835 &freq_val2); 836 if (ret < 0) 837 return ret; 838 839 ret = ltr501_ps_write_samp_freq(data, val, val2); 840 if (ret < 0) 841 return ret; 842 843 /* update persistence count when changing frequency */ 844 ret = ltr501_write_intr_prst(data, chan->type, 845 0, data->ps_period); 846 847 if (ret < 0) 848 /* Do not overwrite error */ 849 ltr501_ps_write_samp_freq(data, freq_val, 850 freq_val2); 851 return ret; 852 default: 853 return -EINVAL; 854 } 855 default: 856 return -EINVAL; 857 } 858 } 859 860 static int ltr501_write_raw(struct iio_dev *indio_dev, 861 struct iio_chan_spec const *chan, 862 int val, int val2, long mask) 863 { 864 int ret; 865 866 if (!iio_device_claim_direct(indio_dev)) 867 return -EBUSY; 868 869 ret = __ltr501_write_raw(indio_dev, chan, val, val2, mask); 870 871 iio_device_release_direct(indio_dev); 872 873 return ret; 874 } 875 876 static int ltr501_read_thresh(const struct iio_dev *indio_dev, 877 const struct iio_chan_spec *chan, 878 enum iio_event_type type, 879 enum iio_event_direction dir, 880 enum iio_event_info info, 881 int *val, int *val2) 882 { 883 const struct ltr501_data *data = iio_priv(indio_dev); 884 int ret, thresh_data; 885 886 switch (chan->type) { 887 case IIO_INTENSITY: 888 switch (dir) { 889 case IIO_EV_DIR_RISING: 890 ret = regmap_bulk_read(data->regmap, 891 LTR501_ALS_THRESH_UP, 892 &thresh_data, 2); 893 if (ret < 0) 894 return ret; 895 *val = thresh_data & LTR501_ALS_THRESH_MASK; 896 return IIO_VAL_INT; 897 case IIO_EV_DIR_FALLING: 898 ret = regmap_bulk_read(data->regmap, 899 LTR501_ALS_THRESH_LOW, 900 &thresh_data, 2); 901 if (ret < 0) 902 return ret; 903 *val = thresh_data & LTR501_ALS_THRESH_MASK; 904 return IIO_VAL_INT; 905 default: 906 return -EINVAL; 907 } 908 case IIO_PROXIMITY: 909 switch (dir) { 910 case IIO_EV_DIR_RISING: 911 ret = regmap_bulk_read(data->regmap, 912 LTR501_PS_THRESH_UP, 913 &thresh_data, 2); 914 if (ret < 0) 915 return ret; 916 *val = thresh_data & LTR501_PS_THRESH_MASK; 917 return IIO_VAL_INT; 918 case IIO_EV_DIR_FALLING: 919 ret = regmap_bulk_read(data->regmap, 920 LTR501_PS_THRESH_LOW, 921 &thresh_data, 2); 922 if (ret < 0) 923 return ret; 924 *val = thresh_data & LTR501_PS_THRESH_MASK; 925 return IIO_VAL_INT; 926 default: 927 return -EINVAL; 928 } 929 default: 930 return -EINVAL; 931 } 932 933 return -EINVAL; 934 } 935 936 static int ltr501_write_thresh(struct iio_dev *indio_dev, 937 const struct iio_chan_spec *chan, 938 enum iio_event_type type, 939 enum iio_event_direction dir, 940 enum iio_event_info info, 941 int val, int val2) 942 { 943 struct ltr501_data *data = iio_priv(indio_dev); 944 int ret; 945 946 if (val < 0) 947 return -EINVAL; 948 949 switch (chan->type) { 950 case IIO_INTENSITY: 951 if (val > LTR501_ALS_THRESH_MASK) 952 return -EINVAL; 953 switch (dir) { 954 case IIO_EV_DIR_RISING: 955 mutex_lock(&data->lock_als); 956 ret = regmap_bulk_write(data->regmap, 957 LTR501_ALS_THRESH_UP, 958 &val, 2); 959 mutex_unlock(&data->lock_als); 960 return ret; 961 case IIO_EV_DIR_FALLING: 962 mutex_lock(&data->lock_als); 963 ret = regmap_bulk_write(data->regmap, 964 LTR501_ALS_THRESH_LOW, 965 &val, 2); 966 mutex_unlock(&data->lock_als); 967 return ret; 968 default: 969 return -EINVAL; 970 } 971 case IIO_PROXIMITY: 972 if (val > LTR501_PS_THRESH_MASK) 973 return -EINVAL; 974 switch (dir) { 975 case IIO_EV_DIR_RISING: 976 mutex_lock(&data->lock_ps); 977 ret = regmap_bulk_write(data->regmap, 978 LTR501_PS_THRESH_UP, 979 &val, 2); 980 mutex_unlock(&data->lock_ps); 981 return ret; 982 case IIO_EV_DIR_FALLING: 983 mutex_lock(&data->lock_ps); 984 ret = regmap_bulk_write(data->regmap, 985 LTR501_PS_THRESH_LOW, 986 &val, 2); 987 mutex_unlock(&data->lock_ps); 988 return ret; 989 default: 990 return -EINVAL; 991 } 992 default: 993 return -EINVAL; 994 } 995 996 return -EINVAL; 997 } 998 999 static int ltr501_read_event(struct iio_dev *indio_dev, 1000 const struct iio_chan_spec *chan, 1001 enum iio_event_type type, 1002 enum iio_event_direction dir, 1003 enum iio_event_info info, 1004 int *val, int *val2) 1005 { 1006 int ret; 1007 1008 switch (info) { 1009 case IIO_EV_INFO_VALUE: 1010 return ltr501_read_thresh(indio_dev, chan, type, dir, 1011 info, val, val2); 1012 case IIO_EV_INFO_PERIOD: 1013 ret = ltr501_read_intr_prst(iio_priv(indio_dev), 1014 chan->type, val2); 1015 *val = *val2 / 1000000; 1016 *val2 = *val2 % 1000000; 1017 return ret; 1018 default: 1019 return -EINVAL; 1020 } 1021 1022 return -EINVAL; 1023 } 1024 1025 static int ltr501_write_event(struct iio_dev *indio_dev, 1026 const struct iio_chan_spec *chan, 1027 enum iio_event_type type, 1028 enum iio_event_direction dir, 1029 enum iio_event_info info, 1030 int val, int val2) 1031 { 1032 switch (info) { 1033 case IIO_EV_INFO_VALUE: 1034 if (val2 != 0) 1035 return -EINVAL; 1036 return ltr501_write_thresh(indio_dev, chan, type, dir, 1037 info, val, val2); 1038 case IIO_EV_INFO_PERIOD: 1039 return ltr501_write_intr_prst(iio_priv(indio_dev), chan->type, 1040 val, val2); 1041 default: 1042 return -EINVAL; 1043 } 1044 1045 return -EINVAL; 1046 } 1047 1048 static int ltr501_read_event_config(struct iio_dev *indio_dev, 1049 const struct iio_chan_spec *chan, 1050 enum iio_event_type type, 1051 enum iio_event_direction dir) 1052 { 1053 struct ltr501_data *data = iio_priv(indio_dev); 1054 int ret, status; 1055 1056 switch (chan->type) { 1057 case IIO_INTENSITY: 1058 ret = regmap_field_read(data->reg_als_intr, &status); 1059 if (ret < 0) 1060 return ret; 1061 return status; 1062 case IIO_PROXIMITY: 1063 ret = regmap_field_read(data->reg_ps_intr, &status); 1064 if (ret < 0) 1065 return ret; 1066 return status; 1067 default: 1068 return -EINVAL; 1069 } 1070 1071 return -EINVAL; 1072 } 1073 1074 static int ltr501_write_event_config(struct iio_dev *indio_dev, 1075 const struct iio_chan_spec *chan, 1076 enum iio_event_type type, 1077 enum iio_event_direction dir, bool state) 1078 { 1079 struct ltr501_data *data = iio_priv(indio_dev); 1080 int ret; 1081 1082 switch (chan->type) { 1083 case IIO_INTENSITY: 1084 mutex_lock(&data->lock_als); 1085 ret = regmap_field_write(data->reg_als_intr, state); 1086 mutex_unlock(&data->lock_als); 1087 return ret; 1088 case IIO_PROXIMITY: 1089 mutex_lock(&data->lock_ps); 1090 ret = regmap_field_write(data->reg_ps_intr, state); 1091 mutex_unlock(&data->lock_ps); 1092 return ret; 1093 default: 1094 return -EINVAL; 1095 } 1096 1097 return -EINVAL; 1098 } 1099 1100 static ssize_t ltr501_show_proximity_scale_avail(struct device *dev, 1101 struct device_attribute *attr, 1102 char *buf) 1103 { 1104 struct ltr501_data *data = iio_priv(dev_to_iio_dev(dev)); 1105 const struct ltr501_chip_info *info = data->chip_info; 1106 ssize_t len = 0; 1107 int i; 1108 1109 for (i = 0; i < info->ps_gain_tbl_size; i++) { 1110 if (info->ps_gain[i].scale == LTR501_RESERVED_GAIN) 1111 continue; 1112 len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ", 1113 info->ps_gain[i].scale, 1114 info->ps_gain[i].uscale); 1115 } 1116 1117 buf[len - 1] = '\n'; 1118 1119 return len; 1120 } 1121 1122 static ssize_t ltr501_show_intensity_scale_avail(struct device *dev, 1123 struct device_attribute *attr, 1124 char *buf) 1125 { 1126 struct ltr501_data *data = iio_priv(dev_to_iio_dev(dev)); 1127 const struct ltr501_chip_info *info = data->chip_info; 1128 ssize_t len = 0; 1129 int i; 1130 1131 for (i = 0; i < info->als_gain_tbl_size; i++) { 1132 if (info->als_gain[i].scale == LTR501_RESERVED_GAIN) 1133 continue; 1134 len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ", 1135 info->als_gain[i].scale, 1136 info->als_gain[i].uscale); 1137 } 1138 1139 buf[len - 1] = '\n'; 1140 1141 return len; 1142 } 1143 1144 static IIO_CONST_ATTR_INT_TIME_AVAIL("0.05 0.1 0.2 0.4"); 1145 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("20 10 5 2 1 0.5"); 1146 1147 static IIO_DEVICE_ATTR(in_proximity_scale_available, S_IRUGO, 1148 ltr501_show_proximity_scale_avail, NULL, 0); 1149 static IIO_DEVICE_ATTR(in_intensity_scale_available, S_IRUGO, 1150 ltr501_show_intensity_scale_avail, NULL, 0); 1151 1152 static struct attribute *ltr501_attributes[] = { 1153 &iio_dev_attr_in_proximity_scale_available.dev_attr.attr, 1154 &iio_dev_attr_in_intensity_scale_available.dev_attr.attr, 1155 &iio_const_attr_integration_time_available.dev_attr.attr, 1156 &iio_const_attr_sampling_frequency_available.dev_attr.attr, 1157 NULL 1158 }; 1159 1160 static struct attribute *ltr301_attributes[] = { 1161 &iio_dev_attr_in_intensity_scale_available.dev_attr.attr, 1162 &iio_const_attr_integration_time_available.dev_attr.attr, 1163 &iio_const_attr_sampling_frequency_available.dev_attr.attr, 1164 NULL 1165 }; 1166 1167 static const struct attribute_group ltr501_attribute_group = { 1168 .attrs = ltr501_attributes, 1169 }; 1170 1171 static const struct attribute_group ltr301_attribute_group = { 1172 .attrs = ltr301_attributes, 1173 }; 1174 1175 static const struct iio_info ltr501_info_no_irq = { 1176 .read_raw = ltr501_read_raw, 1177 .write_raw = ltr501_write_raw, 1178 .attrs = <r501_attribute_group, 1179 }; 1180 1181 static const struct iio_info ltr501_info = { 1182 .read_raw = ltr501_read_raw, 1183 .write_raw = ltr501_write_raw, 1184 .attrs = <r501_attribute_group, 1185 .read_event_value = <r501_read_event, 1186 .write_event_value = <r501_write_event, 1187 .read_event_config = <r501_read_event_config, 1188 .write_event_config = <r501_write_event_config, 1189 }; 1190 1191 static const struct iio_info ltr301_info_no_irq = { 1192 .read_raw = ltr501_read_raw, 1193 .write_raw = ltr501_write_raw, 1194 .attrs = <r301_attribute_group, 1195 }; 1196 1197 static const struct iio_info ltr301_info = { 1198 .read_raw = ltr501_read_raw, 1199 .write_raw = ltr501_write_raw, 1200 .attrs = <r301_attribute_group, 1201 .read_event_value = <r501_read_event, 1202 .write_event_value = <r501_write_event, 1203 .read_event_config = <r501_read_event_config, 1204 .write_event_config = <r501_write_event_config, 1205 }; 1206 1207 static const struct ltr501_chip_info ltr501_chip_info_tbl[] = { 1208 [ltr501] = { 1209 .partid = 0x08, 1210 .als_gain = ltr501_als_gain_tbl, 1211 .als_gain_tbl_size = ARRAY_SIZE(ltr501_als_gain_tbl), 1212 .ps_gain = ltr501_ps_gain_tbl, 1213 .ps_gain_tbl_size = ARRAY_SIZE(ltr501_ps_gain_tbl), 1214 .als_mode_active = BIT(0) | BIT(1), 1215 .als_gain_mask = BIT(3), 1216 .als_gain_shift = 3, 1217 .info = <r501_info, 1218 .info_no_irq = <r501_info_no_irq, 1219 .channels = ltr501_channels, 1220 .no_channels = ARRAY_SIZE(ltr501_channels), 1221 }, 1222 [ltr559] = { 1223 .partid = 0x09, 1224 .als_gain = ltr559_als_gain_tbl, 1225 .als_gain_tbl_size = ARRAY_SIZE(ltr559_als_gain_tbl), 1226 .ps_gain = ltr559_ps_gain_tbl, 1227 .ps_gain_tbl_size = ARRAY_SIZE(ltr559_ps_gain_tbl), 1228 .als_mode_active = BIT(0), 1229 .als_gain_mask = BIT(2) | BIT(3) | BIT(4), 1230 .als_gain_shift = 2, 1231 .info = <r501_info, 1232 .info_no_irq = <r501_info_no_irq, 1233 .channels = ltr501_channels, 1234 .no_channels = ARRAY_SIZE(ltr501_channels), 1235 }, 1236 [ltr301] = { 1237 .partid = 0x08, 1238 .als_gain = ltr501_als_gain_tbl, 1239 .als_gain_tbl_size = ARRAY_SIZE(ltr501_als_gain_tbl), 1240 .als_mode_active = BIT(0) | BIT(1), 1241 .als_gain_mask = BIT(3), 1242 .als_gain_shift = 3, 1243 .info = <r301_info, 1244 .info_no_irq = <r301_info_no_irq, 1245 .channels = ltr301_channels, 1246 .no_channels = ARRAY_SIZE(ltr301_channels), 1247 }, 1248 [ltr303] = { 1249 .partid = 0x0A, 1250 .als_gain = ltr559_als_gain_tbl, 1251 .als_gain_tbl_size = ARRAY_SIZE(ltr559_als_gain_tbl), 1252 .als_mode_active = BIT(0), 1253 .als_gain_mask = BIT(2) | BIT(3) | BIT(4), 1254 .als_gain_shift = 2, 1255 .info = <r301_info, 1256 .info_no_irq = <r301_info_no_irq, 1257 .channels = ltr301_channels, 1258 .no_channels = ARRAY_SIZE(ltr301_channels), 1259 }, 1260 }; 1261 1262 static int ltr501_write_contr(struct ltr501_data *data, u8 als_val, u8 ps_val) 1263 { 1264 int ret; 1265 1266 ret = regmap_write(data->regmap, LTR501_ALS_CONTR, als_val); 1267 if (ret < 0) 1268 return ret; 1269 1270 return regmap_write(data->regmap, LTR501_PS_CONTR, ps_val); 1271 } 1272 1273 static irqreturn_t ltr501_trigger_handler(int irq, void *p) 1274 { 1275 struct iio_poll_func *pf = p; 1276 struct iio_dev *indio_dev = pf->indio_dev; 1277 struct ltr501_data *data = iio_priv(indio_dev); 1278 struct { 1279 u16 channels[3]; 1280 aligned_s64 ts; 1281 } scan = { }; 1282 __le16 als_buf[2]; 1283 u8 mask = 0; 1284 int j = 0; 1285 int ret, psdata; 1286 1287 /* figure out which data needs to be ready */ 1288 if (test_bit(0, indio_dev->active_scan_mask) || 1289 test_bit(1, indio_dev->active_scan_mask)) 1290 mask |= LTR501_STATUS_ALS_RDY; 1291 if (test_bit(2, indio_dev->active_scan_mask)) 1292 mask |= LTR501_STATUS_PS_RDY; 1293 1294 ret = ltr501_drdy(data, mask); 1295 if (ret < 0) 1296 goto done; 1297 1298 if (mask & LTR501_STATUS_ALS_RDY) { 1299 ret = regmap_bulk_read(data->regmap, LTR501_ALS_DATA1, 1300 als_buf, sizeof(als_buf)); 1301 if (ret < 0) 1302 goto done; 1303 if (test_bit(0, indio_dev->active_scan_mask)) 1304 scan.channels[j++] = le16_to_cpu(als_buf[1]); 1305 if (test_bit(1, indio_dev->active_scan_mask)) 1306 scan.channels[j++] = le16_to_cpu(als_buf[0]); 1307 } 1308 1309 if (mask & LTR501_STATUS_PS_RDY) { 1310 ret = regmap_bulk_read(data->regmap, LTR501_PS_DATA, 1311 &psdata, 2); 1312 if (ret < 0) 1313 goto done; 1314 scan.channels[j++] = psdata & LTR501_PS_DATA_MASK; 1315 } 1316 1317 iio_push_to_buffers_with_ts(indio_dev, &scan, sizeof(scan), 1318 iio_get_time_ns(indio_dev)); 1319 1320 done: 1321 iio_trigger_notify_done(indio_dev->trig); 1322 1323 return IRQ_HANDLED; 1324 } 1325 1326 static irqreturn_t ltr501_interrupt_handler(int irq, void *private) 1327 { 1328 struct iio_dev *indio_dev = private; 1329 struct ltr501_data *data = iio_priv(indio_dev); 1330 int ret, status; 1331 1332 ret = regmap_read(data->regmap, LTR501_ALS_PS_STATUS, &status); 1333 if (ret < 0) { 1334 dev_err(&data->client->dev, 1335 "irq read int reg failed\n"); 1336 return IRQ_HANDLED; 1337 } 1338 1339 if (status & LTR501_STATUS_ALS_INTR) 1340 iio_push_event(indio_dev, 1341 IIO_UNMOD_EVENT_CODE(IIO_INTENSITY, 0, 1342 IIO_EV_TYPE_THRESH, 1343 IIO_EV_DIR_EITHER), 1344 iio_get_time_ns(indio_dev)); 1345 1346 if (status & LTR501_STATUS_PS_INTR) 1347 iio_push_event(indio_dev, 1348 IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0, 1349 IIO_EV_TYPE_THRESH, 1350 IIO_EV_DIR_EITHER), 1351 iio_get_time_ns(indio_dev)); 1352 1353 return IRQ_HANDLED; 1354 } 1355 1356 static int ltr501_init(struct ltr501_data *data) 1357 { 1358 int ret, status; 1359 1360 ret = regmap_read(data->regmap, LTR501_ALS_CONTR, &status); 1361 if (ret < 0) 1362 return ret; 1363 1364 data->als_contr = status | data->chip_info->als_mode_active; 1365 1366 ret = regmap_read(data->regmap, LTR501_PS_CONTR, &status); 1367 if (ret < 0) 1368 return ret; 1369 1370 data->ps_contr = status | LTR501_CONTR_ACTIVE; 1371 1372 ret = ltr501_read_intr_prst(data, IIO_INTENSITY, &data->als_period); 1373 if (ret < 0) 1374 return ret; 1375 1376 ret = ltr501_read_intr_prst(data, IIO_PROXIMITY, &data->ps_period); 1377 if (ret < 0) 1378 return ret; 1379 1380 return ltr501_write_contr(data, data->als_contr, data->ps_contr); 1381 } 1382 1383 static bool ltr501_is_volatile_reg(struct device *dev, unsigned int reg) 1384 { 1385 switch (reg) { 1386 case LTR501_ALS_DATA1: 1387 case LTR501_ALS_DATA1_UPPER: 1388 case LTR501_ALS_DATA0: 1389 case LTR501_ALS_DATA0_UPPER: 1390 case LTR501_ALS_PS_STATUS: 1391 case LTR501_PS_DATA: 1392 case LTR501_PS_DATA_UPPER: 1393 return true; 1394 default: 1395 return false; 1396 } 1397 } 1398 1399 static const struct regmap_config ltr501_regmap_config = { 1400 .name = "ltr501_regmap", 1401 .reg_bits = 8, 1402 .val_bits = 8, 1403 .max_register = LTR501_MAX_REG, 1404 .cache_type = REGCACHE_MAPLE, 1405 .volatile_reg = ltr501_is_volatile_reg, 1406 }; 1407 1408 static int ltr501_powerdown(struct ltr501_data *data) 1409 { 1410 return ltr501_write_contr(data, data->als_contr & 1411 ~data->chip_info->als_mode_active, 1412 data->ps_contr & ~LTR501_CONTR_ACTIVE); 1413 } 1414 1415 static int ltr501_probe(struct i2c_client *client) 1416 { 1417 const struct i2c_device_id *id = i2c_client_get_device_id(client); 1418 static const char * const regulator_names[] = { "vdd", "vddio" }; 1419 struct ltr501_data *data; 1420 struct iio_dev *indio_dev; 1421 struct regmap *regmap; 1422 const void *ddata = NULL; 1423 int partid, chip_idx; 1424 const char *name; 1425 int ret; 1426 1427 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); 1428 if (!indio_dev) 1429 return -ENOMEM; 1430 1431 regmap = devm_regmap_init_i2c(client, <r501_regmap_config); 1432 if (IS_ERR(regmap)) { 1433 dev_err(&client->dev, "Regmap initialization failed.\n"); 1434 return PTR_ERR(regmap); 1435 } 1436 1437 data = iio_priv(indio_dev); 1438 i2c_set_clientdata(client, indio_dev); 1439 data->client = client; 1440 data->regmap = regmap; 1441 mutex_init(&data->lock_als); 1442 mutex_init(&data->lock_ps); 1443 1444 ret = devm_regulator_bulk_get_enable(&client->dev, 1445 ARRAY_SIZE(regulator_names), 1446 regulator_names); 1447 if (ret) 1448 return dev_err_probe(&client->dev, ret, 1449 "Failed to get regulators\n"); 1450 1451 data->reg_it = devm_regmap_field_alloc(&client->dev, regmap, 1452 reg_field_it); 1453 if (IS_ERR(data->reg_it)) { 1454 dev_err(&client->dev, "Integ time reg field init failed.\n"); 1455 return PTR_ERR(data->reg_it); 1456 } 1457 1458 data->reg_als_intr = devm_regmap_field_alloc(&client->dev, regmap, 1459 reg_field_als_intr); 1460 if (IS_ERR(data->reg_als_intr)) { 1461 dev_err(&client->dev, "ALS intr mode reg field init failed\n"); 1462 return PTR_ERR(data->reg_als_intr); 1463 } 1464 1465 data->reg_ps_intr = devm_regmap_field_alloc(&client->dev, regmap, 1466 reg_field_ps_intr); 1467 if (IS_ERR(data->reg_ps_intr)) { 1468 dev_err(&client->dev, "PS intr mode reg field init failed.\n"); 1469 return PTR_ERR(data->reg_ps_intr); 1470 } 1471 1472 data->reg_als_rate = devm_regmap_field_alloc(&client->dev, regmap, 1473 reg_field_als_rate); 1474 if (IS_ERR(data->reg_als_rate)) { 1475 dev_err(&client->dev, "ALS samp rate field init failed.\n"); 1476 return PTR_ERR(data->reg_als_rate); 1477 } 1478 1479 data->reg_ps_rate = devm_regmap_field_alloc(&client->dev, regmap, 1480 reg_field_ps_rate); 1481 if (IS_ERR(data->reg_ps_rate)) { 1482 dev_err(&client->dev, "PS samp rate field init failed.\n"); 1483 return PTR_ERR(data->reg_ps_rate); 1484 } 1485 1486 data->reg_als_prst = devm_regmap_field_alloc(&client->dev, regmap, 1487 reg_field_als_prst); 1488 if (IS_ERR(data->reg_als_prst)) { 1489 dev_err(&client->dev, "ALS prst reg field init failed\n"); 1490 return PTR_ERR(data->reg_als_prst); 1491 } 1492 1493 data->reg_ps_prst = devm_regmap_field_alloc(&client->dev, regmap, 1494 reg_field_ps_prst); 1495 if (IS_ERR(data->reg_ps_prst)) { 1496 dev_err(&client->dev, "PS prst reg field init failed.\n"); 1497 return PTR_ERR(data->reg_ps_prst); 1498 } 1499 1500 ret = regmap_read(data->regmap, LTR501_PART_ID, &partid); 1501 if (ret < 0) 1502 return ret; 1503 1504 if (id) { 1505 name = id->name; 1506 chip_idx = id->driver_data; 1507 } else { 1508 name = iio_get_acpi_device_name_and_data(&client->dev, &ddata); 1509 chip_idx = (intptr_t)ddata; 1510 } 1511 if (!name) 1512 return -ENODEV; 1513 1514 data->chip_info = <r501_chip_info_tbl[chip_idx]; 1515 1516 if ((partid >> 4) != data->chip_info->partid) 1517 return -ENODEV; 1518 1519 if (device_property_read_u32(&client->dev, "proximity-near-level", 1520 &data->near_level)) 1521 data->near_level = 0; 1522 1523 indio_dev->info = data->chip_info->info; 1524 indio_dev->channels = data->chip_info->channels; 1525 indio_dev->num_channels = data->chip_info->no_channels; 1526 indio_dev->name = name; 1527 indio_dev->modes = INDIO_DIRECT_MODE; 1528 1529 ret = ltr501_init(data); 1530 if (ret < 0) 1531 return ret; 1532 1533 if (client->irq > 0) { 1534 ret = devm_request_threaded_irq(&client->dev, client->irq, 1535 NULL, ltr501_interrupt_handler, 1536 IRQF_TRIGGER_FALLING | 1537 IRQF_ONESHOT, 1538 "ltr501_thresh_event", 1539 indio_dev); 1540 if (ret) 1541 return ret; 1542 } else { 1543 indio_dev->info = data->chip_info->info_no_irq; 1544 } 1545 1546 ret = iio_triggered_buffer_setup(indio_dev, NULL, 1547 ltr501_trigger_handler, NULL); 1548 if (ret) 1549 goto powerdown_on_error; 1550 1551 ret = iio_device_register(indio_dev); 1552 if (ret) 1553 goto error_unreg_buffer; 1554 1555 return 0; 1556 1557 error_unreg_buffer: 1558 iio_triggered_buffer_cleanup(indio_dev); 1559 powerdown_on_error: 1560 ltr501_powerdown(data); 1561 return ret; 1562 } 1563 1564 static void ltr501_remove(struct i2c_client *client) 1565 { 1566 struct iio_dev *indio_dev = i2c_get_clientdata(client); 1567 1568 iio_device_unregister(indio_dev); 1569 iio_triggered_buffer_cleanup(indio_dev); 1570 ltr501_powerdown(iio_priv(indio_dev)); 1571 } 1572 1573 static int ltr501_suspend(struct device *dev) 1574 { 1575 struct ltr501_data *data = iio_priv(i2c_get_clientdata( 1576 to_i2c_client(dev))); 1577 return ltr501_powerdown(data); 1578 } 1579 1580 static int ltr501_resume(struct device *dev) 1581 { 1582 struct ltr501_data *data = iio_priv(i2c_get_clientdata( 1583 to_i2c_client(dev))); 1584 1585 return ltr501_write_contr(data, data->als_contr, 1586 data->ps_contr); 1587 } 1588 1589 static DEFINE_SIMPLE_DEV_PM_OPS(ltr501_pm_ops, ltr501_suspend, ltr501_resume); 1590 1591 static const struct acpi_device_id ltr_acpi_match[] = { 1592 { "LTER0301", ltr301 }, 1593 /* https://www.catalog.update.microsoft.com/Search.aspx?q=lter0303 */ 1594 { "LTER0303", ltr303 }, 1595 { } 1596 }; 1597 MODULE_DEVICE_TABLE(acpi, ltr_acpi_match); 1598 1599 static const struct i2c_device_id ltr501_id[] = { 1600 { .name = "ltr501", .driver_data = ltr501 }, 1601 { .name = "ltr559", .driver_data = ltr559 }, 1602 { .name = "ltr301", .driver_data = ltr301 }, 1603 { .name = "ltr303", .driver_data = ltr303 }, 1604 { } 1605 }; 1606 MODULE_DEVICE_TABLE(i2c, ltr501_id); 1607 1608 static const struct of_device_id ltr501_of_match[] = { 1609 { .compatible = "liteon,ltr501", }, 1610 { .compatible = "liteon,ltr559", }, 1611 { .compatible = "liteon,ltr301", }, 1612 { .compatible = "liteon,ltr303", }, 1613 { } 1614 }; 1615 MODULE_DEVICE_TABLE(of, ltr501_of_match); 1616 1617 static struct i2c_driver ltr501_driver = { 1618 .driver = { 1619 .name = "ltr501", 1620 .of_match_table = ltr501_of_match, 1621 .pm = pm_sleep_ptr(<r501_pm_ops), 1622 .acpi_match_table = ltr_acpi_match, 1623 }, 1624 .probe = ltr501_probe, 1625 .remove = ltr501_remove, 1626 .id_table = ltr501_id, 1627 }; 1628 1629 module_i2c_driver(ltr501_driver); 1630 1631 MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>"); 1632 MODULE_DESCRIPTION("Lite-On LTR501 ambient light and proximity sensor driver"); 1633 MODULE_LICENSE("GPL"); 1634