1 /* 2 * ltr501.c - Support for Lite-On LTR501 ambient light and proximity sensor 3 * 4 * Copyright 2014 Peter Meerwald <pmeerw@pmeerw.net> 5 * 6 * This file is subject to the terms and conditions of version 2 of 7 * the GNU General Public License. See the file COPYING in the main 8 * directory of this archive for more details. 9 * 10 * 7-bit I2C slave address 0x23 11 * 12 * TODO: IR LED characteristics 13 */ 14 15 #include <linux/module.h> 16 #include <linux/i2c.h> 17 #include <linux/err.h> 18 #include <linux/delay.h> 19 #include <linux/regmap.h> 20 #include <linux/acpi.h> 21 22 #include <linux/iio/iio.h> 23 #include <linux/iio/events.h> 24 #include <linux/iio/sysfs.h> 25 #include <linux/iio/trigger_consumer.h> 26 #include <linux/iio/buffer.h> 27 #include <linux/iio/triggered_buffer.h> 28 29 #define LTR501_DRV_NAME "ltr501" 30 31 #define LTR501_ALS_CONTR 0x80 /* ALS operation mode, SW reset */ 32 #define LTR501_PS_CONTR 0x81 /* PS operation mode */ 33 #define LTR501_PS_MEAS_RATE 0x84 /* measurement rate*/ 34 #define LTR501_ALS_MEAS_RATE 0x85 /* ALS integ time, measurement rate*/ 35 #define LTR501_PART_ID 0x86 36 #define LTR501_MANUFAC_ID 0x87 37 #define LTR501_ALS_DATA1 0x88 /* 16-bit, little endian */ 38 #define LTR501_ALS_DATA0 0x8a /* 16-bit, little endian */ 39 #define LTR501_ALS_PS_STATUS 0x8c 40 #define LTR501_PS_DATA 0x8d /* 16-bit, little endian */ 41 #define LTR501_INTR 0x8f /* output mode, polarity, mode */ 42 #define LTR501_PS_THRESH_UP 0x90 /* 11 bit, ps upper threshold */ 43 #define LTR501_PS_THRESH_LOW 0x92 /* 11 bit, ps lower threshold */ 44 #define LTR501_ALS_THRESH_UP 0x97 /* 16 bit, ALS upper threshold */ 45 #define LTR501_ALS_THRESH_LOW 0x99 /* 16 bit, ALS lower threshold */ 46 #define LTR501_INTR_PRST 0x9e /* ps thresh, als thresh */ 47 #define LTR501_MAX_REG 0x9f 48 49 #define LTR501_ALS_CONTR_SW_RESET BIT(2) 50 #define LTR501_CONTR_PS_GAIN_MASK (BIT(3) | BIT(2)) 51 #define LTR501_CONTR_PS_GAIN_SHIFT 2 52 #define LTR501_CONTR_ALS_GAIN_MASK BIT(3) 53 #define LTR501_CONTR_ACTIVE BIT(1) 54 55 #define LTR501_STATUS_ALS_INTR BIT(3) 56 #define LTR501_STATUS_ALS_RDY BIT(2) 57 #define LTR501_STATUS_PS_INTR BIT(1) 58 #define LTR501_STATUS_PS_RDY BIT(0) 59 60 #define LTR501_PS_DATA_MASK 0x7ff 61 #define LTR501_PS_THRESH_MASK 0x7ff 62 #define LTR501_ALS_THRESH_MASK 0xffff 63 64 #define LTR501_ALS_DEF_PERIOD 500000 65 #define LTR501_PS_DEF_PERIOD 100000 66 67 #define LTR501_REGMAP_NAME "ltr501_regmap" 68 69 #define LTR501_LUX_CONV(vis_coeff, vis_data, ir_coeff, ir_data) \ 70 ((vis_coeff * vis_data) - (ir_coeff * ir_data)) 71 72 static const int int_time_mapping[] = {100000, 50000, 200000, 400000}; 73 74 static const struct reg_field reg_field_it = 75 REG_FIELD(LTR501_ALS_MEAS_RATE, 3, 4); 76 static const struct reg_field reg_field_als_intr = 77 REG_FIELD(LTR501_INTR, 1, 1); 78 static const struct reg_field reg_field_ps_intr = 79 REG_FIELD(LTR501_INTR, 0, 0); 80 static const struct reg_field reg_field_als_rate = 81 REG_FIELD(LTR501_ALS_MEAS_RATE, 0, 2); 82 static const struct reg_field reg_field_ps_rate = 83 REG_FIELD(LTR501_PS_MEAS_RATE, 0, 3); 84 static const struct reg_field reg_field_als_prst = 85 REG_FIELD(LTR501_INTR_PRST, 0, 3); 86 static const struct reg_field reg_field_ps_prst = 87 REG_FIELD(LTR501_INTR_PRST, 4, 7); 88 89 struct ltr501_samp_table { 90 int freq_val; /* repetition frequency in micro HZ*/ 91 int time_val; /* repetition rate in micro seconds */ 92 }; 93 94 #define LTR501_RESERVED_GAIN -1 95 96 enum { 97 ltr501 = 0, 98 ltr559, 99 ltr301, 100 }; 101 102 struct ltr501_gain { 103 int scale; 104 int uscale; 105 }; 106 107 static struct ltr501_gain ltr501_als_gain_tbl[] = { 108 {1, 0}, 109 {0, 5000}, 110 }; 111 112 static struct ltr501_gain ltr559_als_gain_tbl[] = { 113 {1, 0}, 114 {0, 500000}, 115 {0, 250000}, 116 {0, 125000}, 117 {LTR501_RESERVED_GAIN, LTR501_RESERVED_GAIN}, 118 {LTR501_RESERVED_GAIN, LTR501_RESERVED_GAIN}, 119 {0, 20000}, 120 {0, 10000}, 121 }; 122 123 static struct ltr501_gain ltr501_ps_gain_tbl[] = { 124 {1, 0}, 125 {0, 250000}, 126 {0, 125000}, 127 {0, 62500}, 128 }; 129 130 static struct ltr501_gain ltr559_ps_gain_tbl[] = { 131 {0, 62500}, /* x16 gain */ 132 {0, 31250}, /* x32 gain */ 133 {0, 15625}, /* bits X1 are for x64 gain */ 134 {0, 15624}, 135 }; 136 137 struct ltr501_chip_info { 138 u8 partid; 139 struct ltr501_gain *als_gain; 140 int als_gain_tbl_size; 141 struct ltr501_gain *ps_gain; 142 int ps_gain_tbl_size; 143 u8 als_mode_active; 144 u8 als_gain_mask; 145 u8 als_gain_shift; 146 struct iio_chan_spec const *channels; 147 const int no_channels; 148 const struct iio_info *info; 149 const struct iio_info *info_no_irq; 150 }; 151 152 struct ltr501_data { 153 struct i2c_client *client; 154 struct mutex lock_als, lock_ps; 155 struct ltr501_chip_info *chip_info; 156 u8 als_contr, ps_contr; 157 int als_period, ps_period; /* period in micro seconds */ 158 struct regmap *regmap; 159 struct regmap_field *reg_it; 160 struct regmap_field *reg_als_intr; 161 struct regmap_field *reg_ps_intr; 162 struct regmap_field *reg_als_rate; 163 struct regmap_field *reg_ps_rate; 164 struct regmap_field *reg_als_prst; 165 struct regmap_field *reg_ps_prst; 166 }; 167 168 static const struct ltr501_samp_table ltr501_als_samp_table[] = { 169 {20000000, 50000}, {10000000, 100000}, 170 {5000000, 200000}, {2000000, 500000}, 171 {1000000, 1000000}, {500000, 2000000}, 172 {500000, 2000000}, {500000, 2000000} 173 }; 174 175 static const struct ltr501_samp_table ltr501_ps_samp_table[] = { 176 {20000000, 50000}, {14285714, 70000}, 177 {10000000, 100000}, {5000000, 200000}, 178 {2000000, 500000}, {1000000, 1000000}, 179 {500000, 2000000}, {500000, 2000000}, 180 {500000, 2000000} 181 }; 182 183 static int ltr501_match_samp_freq(const struct ltr501_samp_table *tab, 184 int len, int val, int val2) 185 { 186 int i, freq; 187 188 freq = val * 1000000 + val2; 189 190 for (i = 0; i < len; i++) { 191 if (tab[i].freq_val == freq) 192 return i; 193 } 194 195 return -EINVAL; 196 } 197 198 static int ltr501_als_read_samp_freq(struct ltr501_data *data, 199 int *val, int *val2) 200 { 201 int ret, i; 202 203 ret = regmap_field_read(data->reg_als_rate, &i); 204 if (ret < 0) 205 return ret; 206 207 if (i < 0 || i >= ARRAY_SIZE(ltr501_als_samp_table)) 208 return -EINVAL; 209 210 *val = ltr501_als_samp_table[i].freq_val / 1000000; 211 *val2 = ltr501_als_samp_table[i].freq_val % 1000000; 212 213 return IIO_VAL_INT_PLUS_MICRO; 214 } 215 216 static int ltr501_ps_read_samp_freq(struct ltr501_data *data, 217 int *val, int *val2) 218 { 219 int ret, i; 220 221 ret = regmap_field_read(data->reg_ps_rate, &i); 222 if (ret < 0) 223 return ret; 224 225 if (i < 0 || i >= ARRAY_SIZE(ltr501_ps_samp_table)) 226 return -EINVAL; 227 228 *val = ltr501_ps_samp_table[i].freq_val / 1000000; 229 *val2 = ltr501_ps_samp_table[i].freq_val % 1000000; 230 231 return IIO_VAL_INT_PLUS_MICRO; 232 } 233 234 static int ltr501_als_write_samp_freq(struct ltr501_data *data, 235 int val, int val2) 236 { 237 int i, ret; 238 239 i = ltr501_match_samp_freq(ltr501_als_samp_table, 240 ARRAY_SIZE(ltr501_als_samp_table), 241 val, val2); 242 243 if (i < 0) 244 return i; 245 246 mutex_lock(&data->lock_als); 247 ret = regmap_field_write(data->reg_als_rate, i); 248 mutex_unlock(&data->lock_als); 249 250 return ret; 251 } 252 253 static int ltr501_ps_write_samp_freq(struct ltr501_data *data, 254 int val, int val2) 255 { 256 int i, ret; 257 258 i = ltr501_match_samp_freq(ltr501_ps_samp_table, 259 ARRAY_SIZE(ltr501_ps_samp_table), 260 val, val2); 261 262 if (i < 0) 263 return i; 264 265 mutex_lock(&data->lock_ps); 266 ret = regmap_field_write(data->reg_ps_rate, i); 267 mutex_unlock(&data->lock_ps); 268 269 return ret; 270 } 271 272 static int ltr501_als_read_samp_period(struct ltr501_data *data, int *val) 273 { 274 int ret, i; 275 276 ret = regmap_field_read(data->reg_als_rate, &i); 277 if (ret < 0) 278 return ret; 279 280 if (i < 0 || i >= ARRAY_SIZE(ltr501_als_samp_table)) 281 return -EINVAL; 282 283 *val = ltr501_als_samp_table[i].time_val; 284 285 return IIO_VAL_INT; 286 } 287 288 static int ltr501_ps_read_samp_period(struct ltr501_data *data, int *val) 289 { 290 int ret, i; 291 292 ret = regmap_field_read(data->reg_ps_rate, &i); 293 if (ret < 0) 294 return ret; 295 296 if (i < 0 || i >= ARRAY_SIZE(ltr501_ps_samp_table)) 297 return -EINVAL; 298 299 *val = ltr501_ps_samp_table[i].time_val; 300 301 return IIO_VAL_INT; 302 } 303 304 /* IR and visible spectrum coeff's are given in data sheet */ 305 static unsigned long ltr501_calculate_lux(u16 vis_data, u16 ir_data) 306 { 307 unsigned long ratio, lux; 308 309 if (vis_data == 0) 310 return 0; 311 312 /* multiply numerator by 100 to avoid handling ratio < 1 */ 313 ratio = DIV_ROUND_UP(ir_data * 100, ir_data + vis_data); 314 315 if (ratio < 45) 316 lux = LTR501_LUX_CONV(1774, vis_data, -1105, ir_data); 317 else if (ratio >= 45 && ratio < 64) 318 lux = LTR501_LUX_CONV(3772, vis_data, 1336, ir_data); 319 else if (ratio >= 64 && ratio < 85) 320 lux = LTR501_LUX_CONV(1690, vis_data, 169, ir_data); 321 else 322 lux = 0; 323 324 return lux / 1000; 325 } 326 327 static int ltr501_drdy(struct ltr501_data *data, u8 drdy_mask) 328 { 329 int tries = 100; 330 int ret, status; 331 332 while (tries--) { 333 ret = regmap_read(data->regmap, LTR501_ALS_PS_STATUS, &status); 334 if (ret < 0) 335 return ret; 336 if ((status & drdy_mask) == drdy_mask) 337 return 0; 338 msleep(25); 339 } 340 341 dev_err(&data->client->dev, "ltr501_drdy() failed, data not ready\n"); 342 return -EIO; 343 } 344 345 static int ltr501_set_it_time(struct ltr501_data *data, int it) 346 { 347 int ret, i, index = -1, status; 348 349 for (i = 0; i < ARRAY_SIZE(int_time_mapping); i++) { 350 if (int_time_mapping[i] == it) { 351 index = i; 352 break; 353 } 354 } 355 /* Make sure integ time index is valid */ 356 if (index < 0) 357 return -EINVAL; 358 359 ret = regmap_read(data->regmap, LTR501_ALS_CONTR, &status); 360 if (ret < 0) 361 return ret; 362 363 if (status & LTR501_CONTR_ALS_GAIN_MASK) { 364 /* 365 * 200 ms and 400 ms integ time can only be 366 * used in dynamic range 1 367 */ 368 if (index > 1) 369 return -EINVAL; 370 } else 371 /* 50 ms integ time can only be used in dynamic range 2 */ 372 if (index == 1) 373 return -EINVAL; 374 375 return regmap_field_write(data->reg_it, index); 376 } 377 378 /* read int time in micro seconds */ 379 static int ltr501_read_it_time(struct ltr501_data *data, int *val, int *val2) 380 { 381 int ret, index; 382 383 ret = regmap_field_read(data->reg_it, &index); 384 if (ret < 0) 385 return ret; 386 387 /* Make sure integ time index is valid */ 388 if (index < 0 || index >= ARRAY_SIZE(int_time_mapping)) 389 return -EINVAL; 390 391 *val2 = int_time_mapping[index]; 392 *val = 0; 393 394 return IIO_VAL_INT_PLUS_MICRO; 395 } 396 397 static int ltr501_read_als(struct ltr501_data *data, __le16 buf[2]) 398 { 399 int ret; 400 401 ret = ltr501_drdy(data, LTR501_STATUS_ALS_RDY); 402 if (ret < 0) 403 return ret; 404 /* always read both ALS channels in given order */ 405 return regmap_bulk_read(data->regmap, LTR501_ALS_DATA1, 406 buf, 2 * sizeof(__le16)); 407 } 408 409 static int ltr501_read_ps(struct ltr501_data *data) 410 { 411 int ret, status; 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, 2); 419 if (ret < 0) 420 return ret; 421 422 return status; 423 } 424 425 static int ltr501_read_intr_prst(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 const struct iio_event_spec ltr501_als_event_spec[] = { 524 { 525 .type = IIO_EV_TYPE_THRESH, 526 .dir = IIO_EV_DIR_RISING, 527 .mask_separate = BIT(IIO_EV_INFO_VALUE), 528 }, { 529 .type = IIO_EV_TYPE_THRESH, 530 .dir = IIO_EV_DIR_FALLING, 531 .mask_separate = BIT(IIO_EV_INFO_VALUE), 532 }, { 533 .type = IIO_EV_TYPE_THRESH, 534 .dir = IIO_EV_DIR_EITHER, 535 .mask_separate = BIT(IIO_EV_INFO_ENABLE) | 536 BIT(IIO_EV_INFO_PERIOD), 537 }, 538 539 }; 540 541 static const struct iio_event_spec ltr501_pxs_event_spec[] = { 542 { 543 .type = IIO_EV_TYPE_THRESH, 544 .dir = IIO_EV_DIR_RISING, 545 .mask_separate = BIT(IIO_EV_INFO_VALUE), 546 }, { 547 .type = IIO_EV_TYPE_THRESH, 548 .dir = IIO_EV_DIR_FALLING, 549 .mask_separate = BIT(IIO_EV_INFO_VALUE), 550 }, { 551 .type = IIO_EV_TYPE_THRESH, 552 .dir = IIO_EV_DIR_EITHER, 553 .mask_separate = BIT(IIO_EV_INFO_ENABLE) | 554 BIT(IIO_EV_INFO_PERIOD), 555 }, 556 }; 557 558 #define LTR501_INTENSITY_CHANNEL(_idx, _addr, _mod, _shared, \ 559 _evspec, _evsize) { \ 560 .type = IIO_INTENSITY, \ 561 .modified = 1, \ 562 .address = (_addr), \ 563 .channel2 = (_mod), \ 564 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ 565 .info_mask_shared_by_type = (_shared), \ 566 .scan_index = (_idx), \ 567 .scan_type = { \ 568 .sign = 'u', \ 569 .realbits = 16, \ 570 .storagebits = 16, \ 571 .endianness = IIO_CPU, \ 572 }, \ 573 .event_spec = _evspec,\ 574 .num_event_specs = _evsize,\ 575 } 576 577 #define LTR501_LIGHT_CHANNEL() { \ 578 .type = IIO_LIGHT, \ 579 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \ 580 .scan_index = -1, \ 581 } 582 583 static const struct iio_chan_spec ltr501_channels[] = { 584 LTR501_LIGHT_CHANNEL(), 585 LTR501_INTENSITY_CHANNEL(0, LTR501_ALS_DATA0, IIO_MOD_LIGHT_BOTH, 0, 586 ltr501_als_event_spec, 587 ARRAY_SIZE(ltr501_als_event_spec)), 588 LTR501_INTENSITY_CHANNEL(1, LTR501_ALS_DATA1, IIO_MOD_LIGHT_IR, 589 BIT(IIO_CHAN_INFO_SCALE) | 590 BIT(IIO_CHAN_INFO_INT_TIME) | 591 BIT(IIO_CHAN_INFO_SAMP_FREQ), 592 NULL, 0), 593 { 594 .type = IIO_PROXIMITY, 595 .address = LTR501_PS_DATA, 596 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 597 BIT(IIO_CHAN_INFO_SCALE), 598 .scan_index = 2, 599 .scan_type = { 600 .sign = 'u', 601 .realbits = 11, 602 .storagebits = 16, 603 .endianness = IIO_CPU, 604 }, 605 .event_spec = ltr501_pxs_event_spec, 606 .num_event_specs = ARRAY_SIZE(ltr501_pxs_event_spec), 607 }, 608 IIO_CHAN_SOFT_TIMESTAMP(3), 609 }; 610 611 static const struct iio_chan_spec ltr301_channels[] = { 612 LTR501_LIGHT_CHANNEL(), 613 LTR501_INTENSITY_CHANNEL(0, LTR501_ALS_DATA0, IIO_MOD_LIGHT_BOTH, 0, 614 ltr501_als_event_spec, 615 ARRAY_SIZE(ltr501_als_event_spec)), 616 LTR501_INTENSITY_CHANNEL(1, LTR501_ALS_DATA1, IIO_MOD_LIGHT_IR, 617 BIT(IIO_CHAN_INFO_SCALE) | 618 BIT(IIO_CHAN_INFO_INT_TIME) | 619 BIT(IIO_CHAN_INFO_SAMP_FREQ), 620 NULL, 0), 621 IIO_CHAN_SOFT_TIMESTAMP(2), 622 }; 623 624 static int ltr501_read_raw(struct iio_dev *indio_dev, 625 struct iio_chan_spec const *chan, 626 int *val, int *val2, long mask) 627 { 628 struct ltr501_data *data = iio_priv(indio_dev); 629 __le16 buf[2]; 630 int ret, i; 631 632 switch (mask) { 633 case IIO_CHAN_INFO_PROCESSED: 634 switch (chan->type) { 635 case IIO_LIGHT: 636 ret = iio_device_claim_direct_mode(indio_dev); 637 if (ret) 638 return ret; 639 640 mutex_lock(&data->lock_als); 641 ret = ltr501_read_als(data, buf); 642 mutex_unlock(&data->lock_als); 643 iio_device_release_direct_mode(indio_dev); 644 if (ret < 0) 645 return ret; 646 *val = ltr501_calculate_lux(le16_to_cpu(buf[1]), 647 le16_to_cpu(buf[0])); 648 return IIO_VAL_INT; 649 default: 650 return -EINVAL; 651 } 652 case IIO_CHAN_INFO_RAW: 653 ret = iio_device_claim_direct_mode(indio_dev); 654 if (ret) 655 return ret; 656 657 switch (chan->type) { 658 case IIO_INTENSITY: 659 mutex_lock(&data->lock_als); 660 ret = ltr501_read_als(data, buf); 661 mutex_unlock(&data->lock_als); 662 if (ret < 0) 663 break; 664 *val = le16_to_cpu(chan->address == LTR501_ALS_DATA1 ? 665 buf[0] : buf[1]); 666 ret = IIO_VAL_INT; 667 break; 668 case IIO_PROXIMITY: 669 mutex_lock(&data->lock_ps); 670 ret = ltr501_read_ps(data); 671 mutex_unlock(&data->lock_ps); 672 if (ret < 0) 673 break; 674 *val = ret & LTR501_PS_DATA_MASK; 675 ret = IIO_VAL_INT; 676 break; 677 default: 678 ret = -EINVAL; 679 break; 680 } 681 682 iio_device_release_direct_mode(indio_dev); 683 return ret; 684 685 case IIO_CHAN_INFO_SCALE: 686 switch (chan->type) { 687 case IIO_INTENSITY: 688 i = (data->als_contr & data->chip_info->als_gain_mask) 689 >> data->chip_info->als_gain_shift; 690 *val = data->chip_info->als_gain[i].scale; 691 *val2 = data->chip_info->als_gain[i].uscale; 692 return IIO_VAL_INT_PLUS_MICRO; 693 case IIO_PROXIMITY: 694 i = (data->ps_contr & LTR501_CONTR_PS_GAIN_MASK) >> 695 LTR501_CONTR_PS_GAIN_SHIFT; 696 *val = data->chip_info->ps_gain[i].scale; 697 *val2 = data->chip_info->ps_gain[i].uscale; 698 return IIO_VAL_INT_PLUS_MICRO; 699 default: 700 return -EINVAL; 701 } 702 case IIO_CHAN_INFO_INT_TIME: 703 switch (chan->type) { 704 case IIO_INTENSITY: 705 return ltr501_read_it_time(data, val, val2); 706 default: 707 return -EINVAL; 708 } 709 case IIO_CHAN_INFO_SAMP_FREQ: 710 switch (chan->type) { 711 case IIO_INTENSITY: 712 return ltr501_als_read_samp_freq(data, val, val2); 713 case IIO_PROXIMITY: 714 return ltr501_ps_read_samp_freq(data, val, val2); 715 default: 716 return -EINVAL; 717 } 718 } 719 return -EINVAL; 720 } 721 722 static int ltr501_get_gain_index(struct ltr501_gain *gain, int size, 723 int val, int val2) 724 { 725 int i; 726 727 for (i = 0; i < size; i++) 728 if (val == gain[i].scale && val2 == gain[i].uscale) 729 return i; 730 731 return -1; 732 } 733 734 static int ltr501_write_raw(struct iio_dev *indio_dev, 735 struct iio_chan_spec const *chan, 736 int val, int val2, long mask) 737 { 738 struct ltr501_data *data = iio_priv(indio_dev); 739 int i, ret, freq_val, freq_val2; 740 struct ltr501_chip_info *info = data->chip_info; 741 742 ret = iio_device_claim_direct_mode(indio_dev); 743 if (ret) 744 return ret; 745 746 switch (mask) { 747 case IIO_CHAN_INFO_SCALE: 748 switch (chan->type) { 749 case IIO_INTENSITY: 750 i = ltr501_get_gain_index(info->als_gain, 751 info->als_gain_tbl_size, 752 val, val2); 753 if (i < 0) { 754 ret = -EINVAL; 755 break; 756 } 757 758 data->als_contr &= ~info->als_gain_mask; 759 data->als_contr |= i << info->als_gain_shift; 760 761 ret = regmap_write(data->regmap, LTR501_ALS_CONTR, 762 data->als_contr); 763 break; 764 case IIO_PROXIMITY: 765 i = ltr501_get_gain_index(info->ps_gain, 766 info->ps_gain_tbl_size, 767 val, val2); 768 if (i < 0) { 769 ret = -EINVAL; 770 break; 771 } 772 data->ps_contr &= ~LTR501_CONTR_PS_GAIN_MASK; 773 data->ps_contr |= i << LTR501_CONTR_PS_GAIN_SHIFT; 774 775 ret = regmap_write(data->regmap, LTR501_PS_CONTR, 776 data->ps_contr); 777 break; 778 default: 779 ret = -EINVAL; 780 break; 781 } 782 break; 783 784 case IIO_CHAN_INFO_INT_TIME: 785 switch (chan->type) { 786 case IIO_INTENSITY: 787 if (val != 0) { 788 ret = -EINVAL; 789 break; 790 } 791 mutex_lock(&data->lock_als); 792 ret = ltr501_set_it_time(data, val2); 793 mutex_unlock(&data->lock_als); 794 break; 795 default: 796 ret = -EINVAL; 797 break; 798 } 799 break; 800 801 case IIO_CHAN_INFO_SAMP_FREQ: 802 switch (chan->type) { 803 case IIO_INTENSITY: 804 ret = ltr501_als_read_samp_freq(data, &freq_val, 805 &freq_val2); 806 if (ret < 0) 807 break; 808 809 ret = ltr501_als_write_samp_freq(data, val, val2); 810 if (ret < 0) 811 break; 812 813 /* update persistence count when changing frequency */ 814 ret = ltr501_write_intr_prst(data, chan->type, 815 0, data->als_period); 816 817 if (ret < 0) 818 ret = ltr501_als_write_samp_freq(data, freq_val, 819 freq_val2); 820 break; 821 case IIO_PROXIMITY: 822 ret = ltr501_ps_read_samp_freq(data, &freq_val, 823 &freq_val2); 824 if (ret < 0) 825 break; 826 827 ret = ltr501_ps_write_samp_freq(data, val, val2); 828 if (ret < 0) 829 break; 830 831 /* update persistence count when changing frequency */ 832 ret = ltr501_write_intr_prst(data, chan->type, 833 0, data->ps_period); 834 835 if (ret < 0) 836 ret = ltr501_ps_write_samp_freq(data, freq_val, 837 freq_val2); 838 break; 839 default: 840 ret = -EINVAL; 841 break; 842 } 843 break; 844 845 default: 846 ret = -EINVAL; 847 break; 848 } 849 850 iio_device_release_direct_mode(indio_dev); 851 return ret; 852 } 853 854 static int ltr501_read_thresh(struct iio_dev *indio_dev, 855 const struct iio_chan_spec *chan, 856 enum iio_event_type type, 857 enum iio_event_direction dir, 858 enum iio_event_info info, 859 int *val, int *val2) 860 { 861 struct ltr501_data *data = iio_priv(indio_dev); 862 int ret, thresh_data; 863 864 switch (chan->type) { 865 case IIO_INTENSITY: 866 switch (dir) { 867 case IIO_EV_DIR_RISING: 868 ret = regmap_bulk_read(data->regmap, 869 LTR501_ALS_THRESH_UP, 870 &thresh_data, 2); 871 if (ret < 0) 872 return ret; 873 *val = thresh_data & LTR501_ALS_THRESH_MASK; 874 return IIO_VAL_INT; 875 case IIO_EV_DIR_FALLING: 876 ret = regmap_bulk_read(data->regmap, 877 LTR501_ALS_THRESH_LOW, 878 &thresh_data, 2); 879 if (ret < 0) 880 return ret; 881 *val = thresh_data & LTR501_ALS_THRESH_MASK; 882 return IIO_VAL_INT; 883 default: 884 return -EINVAL; 885 } 886 case IIO_PROXIMITY: 887 switch (dir) { 888 case IIO_EV_DIR_RISING: 889 ret = regmap_bulk_read(data->regmap, 890 LTR501_PS_THRESH_UP, 891 &thresh_data, 2); 892 if (ret < 0) 893 return ret; 894 *val = thresh_data & LTR501_PS_THRESH_MASK; 895 return IIO_VAL_INT; 896 case IIO_EV_DIR_FALLING: 897 ret = regmap_bulk_read(data->regmap, 898 LTR501_PS_THRESH_LOW, 899 &thresh_data, 2); 900 if (ret < 0) 901 return ret; 902 *val = thresh_data & LTR501_PS_THRESH_MASK; 903 return IIO_VAL_INT; 904 default: 905 return -EINVAL; 906 } 907 default: 908 return -EINVAL; 909 } 910 911 return -EINVAL; 912 } 913 914 static int ltr501_write_thresh(struct iio_dev *indio_dev, 915 const struct iio_chan_spec *chan, 916 enum iio_event_type type, 917 enum iio_event_direction dir, 918 enum iio_event_info info, 919 int val, int val2) 920 { 921 struct ltr501_data *data = iio_priv(indio_dev); 922 int ret; 923 924 if (val < 0) 925 return -EINVAL; 926 927 switch (chan->type) { 928 case IIO_INTENSITY: 929 if (val > LTR501_ALS_THRESH_MASK) 930 return -EINVAL; 931 switch (dir) { 932 case IIO_EV_DIR_RISING: 933 mutex_lock(&data->lock_als); 934 ret = regmap_bulk_write(data->regmap, 935 LTR501_ALS_THRESH_UP, 936 &val, 2); 937 mutex_unlock(&data->lock_als); 938 return ret; 939 case IIO_EV_DIR_FALLING: 940 mutex_lock(&data->lock_als); 941 ret = regmap_bulk_write(data->regmap, 942 LTR501_ALS_THRESH_LOW, 943 &val, 2); 944 mutex_unlock(&data->lock_als); 945 return ret; 946 default: 947 return -EINVAL; 948 } 949 case IIO_PROXIMITY: 950 if (val > LTR501_PS_THRESH_MASK) 951 return -EINVAL; 952 switch (dir) { 953 case IIO_EV_DIR_RISING: 954 mutex_lock(&data->lock_ps); 955 ret = regmap_bulk_write(data->regmap, 956 LTR501_PS_THRESH_UP, 957 &val, 2); 958 mutex_unlock(&data->lock_ps); 959 return ret; 960 case IIO_EV_DIR_FALLING: 961 mutex_lock(&data->lock_ps); 962 ret = regmap_bulk_write(data->regmap, 963 LTR501_PS_THRESH_LOW, 964 &val, 2); 965 mutex_unlock(&data->lock_ps); 966 return ret; 967 default: 968 return -EINVAL; 969 } 970 default: 971 return -EINVAL; 972 } 973 974 return -EINVAL; 975 } 976 977 static int ltr501_read_event(struct iio_dev *indio_dev, 978 const struct iio_chan_spec *chan, 979 enum iio_event_type type, 980 enum iio_event_direction dir, 981 enum iio_event_info info, 982 int *val, int *val2) 983 { 984 int ret; 985 986 switch (info) { 987 case IIO_EV_INFO_VALUE: 988 return ltr501_read_thresh(indio_dev, chan, type, dir, 989 info, val, val2); 990 case IIO_EV_INFO_PERIOD: 991 ret = ltr501_read_intr_prst(iio_priv(indio_dev), 992 chan->type, val2); 993 *val = *val2 / 1000000; 994 *val2 = *val2 % 1000000; 995 return ret; 996 default: 997 return -EINVAL; 998 } 999 1000 return -EINVAL; 1001 } 1002 1003 static int ltr501_write_event(struct iio_dev *indio_dev, 1004 const struct iio_chan_spec *chan, 1005 enum iio_event_type type, 1006 enum iio_event_direction dir, 1007 enum iio_event_info info, 1008 int val, int val2) 1009 { 1010 switch (info) { 1011 case IIO_EV_INFO_VALUE: 1012 if (val2 != 0) 1013 return -EINVAL; 1014 return ltr501_write_thresh(indio_dev, chan, type, dir, 1015 info, val, val2); 1016 case IIO_EV_INFO_PERIOD: 1017 return ltr501_write_intr_prst(iio_priv(indio_dev), chan->type, 1018 val, val2); 1019 default: 1020 return -EINVAL; 1021 } 1022 1023 return -EINVAL; 1024 } 1025 1026 static int ltr501_read_event_config(struct iio_dev *indio_dev, 1027 const struct iio_chan_spec *chan, 1028 enum iio_event_type type, 1029 enum iio_event_direction dir) 1030 { 1031 struct ltr501_data *data = iio_priv(indio_dev); 1032 int ret, status; 1033 1034 switch (chan->type) { 1035 case IIO_INTENSITY: 1036 ret = regmap_field_read(data->reg_als_intr, &status); 1037 if (ret < 0) 1038 return ret; 1039 return status; 1040 case IIO_PROXIMITY: 1041 ret = regmap_field_read(data->reg_ps_intr, &status); 1042 if (ret < 0) 1043 return ret; 1044 return status; 1045 default: 1046 return -EINVAL; 1047 } 1048 1049 return -EINVAL; 1050 } 1051 1052 static int ltr501_write_event_config(struct iio_dev *indio_dev, 1053 const struct iio_chan_spec *chan, 1054 enum iio_event_type type, 1055 enum iio_event_direction dir, int state) 1056 { 1057 struct ltr501_data *data = iio_priv(indio_dev); 1058 int ret; 1059 1060 /* only 1 and 0 are valid inputs */ 1061 if (state != 1 && state != 0) 1062 return -EINVAL; 1063 1064 switch (chan->type) { 1065 case IIO_INTENSITY: 1066 mutex_lock(&data->lock_als); 1067 ret = regmap_field_write(data->reg_als_intr, state); 1068 mutex_unlock(&data->lock_als); 1069 return ret; 1070 case IIO_PROXIMITY: 1071 mutex_lock(&data->lock_ps); 1072 ret = regmap_field_write(data->reg_ps_intr, state); 1073 mutex_unlock(&data->lock_ps); 1074 return ret; 1075 default: 1076 return -EINVAL; 1077 } 1078 1079 return -EINVAL; 1080 } 1081 1082 static ssize_t ltr501_show_proximity_scale_avail(struct device *dev, 1083 struct device_attribute *attr, 1084 char *buf) 1085 { 1086 struct ltr501_data *data = iio_priv(dev_to_iio_dev(dev)); 1087 struct ltr501_chip_info *info = data->chip_info; 1088 ssize_t len = 0; 1089 int i; 1090 1091 for (i = 0; i < info->ps_gain_tbl_size; i++) { 1092 if (info->ps_gain[i].scale == LTR501_RESERVED_GAIN) 1093 continue; 1094 len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ", 1095 info->ps_gain[i].scale, 1096 info->ps_gain[i].uscale); 1097 } 1098 1099 buf[len - 1] = '\n'; 1100 1101 return len; 1102 } 1103 1104 static ssize_t ltr501_show_intensity_scale_avail(struct device *dev, 1105 struct device_attribute *attr, 1106 char *buf) 1107 { 1108 struct ltr501_data *data = iio_priv(dev_to_iio_dev(dev)); 1109 struct ltr501_chip_info *info = data->chip_info; 1110 ssize_t len = 0; 1111 int i; 1112 1113 for (i = 0; i < info->als_gain_tbl_size; i++) { 1114 if (info->als_gain[i].scale == LTR501_RESERVED_GAIN) 1115 continue; 1116 len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ", 1117 info->als_gain[i].scale, 1118 info->als_gain[i].uscale); 1119 } 1120 1121 buf[len - 1] = '\n'; 1122 1123 return len; 1124 } 1125 1126 static IIO_CONST_ATTR_INT_TIME_AVAIL("0.05 0.1 0.2 0.4"); 1127 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("20 10 5 2 1 0.5"); 1128 1129 static IIO_DEVICE_ATTR(in_proximity_scale_available, S_IRUGO, 1130 ltr501_show_proximity_scale_avail, NULL, 0); 1131 static IIO_DEVICE_ATTR(in_intensity_scale_available, S_IRUGO, 1132 ltr501_show_intensity_scale_avail, NULL, 0); 1133 1134 static struct attribute *ltr501_attributes[] = { 1135 &iio_dev_attr_in_proximity_scale_available.dev_attr.attr, 1136 &iio_dev_attr_in_intensity_scale_available.dev_attr.attr, 1137 &iio_const_attr_integration_time_available.dev_attr.attr, 1138 &iio_const_attr_sampling_frequency_available.dev_attr.attr, 1139 NULL 1140 }; 1141 1142 static struct attribute *ltr301_attributes[] = { 1143 &iio_dev_attr_in_intensity_scale_available.dev_attr.attr, 1144 &iio_const_attr_integration_time_available.dev_attr.attr, 1145 &iio_const_attr_sampling_frequency_available.dev_attr.attr, 1146 NULL 1147 }; 1148 1149 static const struct attribute_group ltr501_attribute_group = { 1150 .attrs = ltr501_attributes, 1151 }; 1152 1153 static const struct attribute_group ltr301_attribute_group = { 1154 .attrs = ltr301_attributes, 1155 }; 1156 1157 static const struct iio_info ltr501_info_no_irq = { 1158 .read_raw = ltr501_read_raw, 1159 .write_raw = ltr501_write_raw, 1160 .attrs = <r501_attribute_group, 1161 }; 1162 1163 static const struct iio_info ltr501_info = { 1164 .read_raw = ltr501_read_raw, 1165 .write_raw = ltr501_write_raw, 1166 .attrs = <r501_attribute_group, 1167 .read_event_value = <r501_read_event, 1168 .write_event_value = <r501_write_event, 1169 .read_event_config = <r501_read_event_config, 1170 .write_event_config = <r501_write_event_config, 1171 }; 1172 1173 static const struct iio_info ltr301_info_no_irq = { 1174 .read_raw = ltr501_read_raw, 1175 .write_raw = ltr501_write_raw, 1176 .attrs = <r301_attribute_group, 1177 }; 1178 1179 static const struct iio_info ltr301_info = { 1180 .read_raw = ltr501_read_raw, 1181 .write_raw = ltr501_write_raw, 1182 .attrs = <r301_attribute_group, 1183 .read_event_value = <r501_read_event, 1184 .write_event_value = <r501_write_event, 1185 .read_event_config = <r501_read_event_config, 1186 .write_event_config = <r501_write_event_config, 1187 }; 1188 1189 static struct ltr501_chip_info ltr501_chip_info_tbl[] = { 1190 [ltr501] = { 1191 .partid = 0x08, 1192 .als_gain = ltr501_als_gain_tbl, 1193 .als_gain_tbl_size = ARRAY_SIZE(ltr501_als_gain_tbl), 1194 .ps_gain = ltr501_ps_gain_tbl, 1195 .ps_gain_tbl_size = ARRAY_SIZE(ltr501_ps_gain_tbl), 1196 .als_mode_active = BIT(0) | BIT(1), 1197 .als_gain_mask = BIT(3), 1198 .als_gain_shift = 3, 1199 .info = <r501_info, 1200 .info_no_irq = <r501_info_no_irq, 1201 .channels = ltr501_channels, 1202 .no_channels = ARRAY_SIZE(ltr501_channels), 1203 }, 1204 [ltr559] = { 1205 .partid = 0x09, 1206 .als_gain = ltr559_als_gain_tbl, 1207 .als_gain_tbl_size = ARRAY_SIZE(ltr559_als_gain_tbl), 1208 .ps_gain = ltr559_ps_gain_tbl, 1209 .ps_gain_tbl_size = ARRAY_SIZE(ltr559_ps_gain_tbl), 1210 .als_mode_active = BIT(1), 1211 .als_gain_mask = BIT(2) | BIT(3) | BIT(4), 1212 .als_gain_shift = 2, 1213 .info = <r501_info, 1214 .info_no_irq = <r501_info_no_irq, 1215 .channels = ltr501_channels, 1216 .no_channels = ARRAY_SIZE(ltr501_channels), 1217 }, 1218 [ltr301] = { 1219 .partid = 0x08, 1220 .als_gain = ltr501_als_gain_tbl, 1221 .als_gain_tbl_size = ARRAY_SIZE(ltr501_als_gain_tbl), 1222 .als_mode_active = BIT(0) | BIT(1), 1223 .als_gain_mask = BIT(3), 1224 .als_gain_shift = 3, 1225 .info = <r301_info, 1226 .info_no_irq = <r301_info_no_irq, 1227 .channels = ltr301_channels, 1228 .no_channels = ARRAY_SIZE(ltr301_channels), 1229 }, 1230 }; 1231 1232 static int ltr501_write_contr(struct ltr501_data *data, u8 als_val, u8 ps_val) 1233 { 1234 int ret; 1235 1236 ret = regmap_write(data->regmap, LTR501_ALS_CONTR, als_val); 1237 if (ret < 0) 1238 return ret; 1239 1240 return regmap_write(data->regmap, LTR501_PS_CONTR, ps_val); 1241 } 1242 1243 static irqreturn_t ltr501_trigger_handler(int irq, void *p) 1244 { 1245 struct iio_poll_func *pf = p; 1246 struct iio_dev *indio_dev = pf->indio_dev; 1247 struct ltr501_data *data = iio_priv(indio_dev); 1248 u16 buf[8]; 1249 __le16 als_buf[2]; 1250 u8 mask = 0; 1251 int j = 0; 1252 int ret, psdata; 1253 1254 memset(buf, 0, sizeof(buf)); 1255 1256 /* figure out which data needs to be ready */ 1257 if (test_bit(0, indio_dev->active_scan_mask) || 1258 test_bit(1, indio_dev->active_scan_mask)) 1259 mask |= LTR501_STATUS_ALS_RDY; 1260 if (test_bit(2, indio_dev->active_scan_mask)) 1261 mask |= LTR501_STATUS_PS_RDY; 1262 1263 ret = ltr501_drdy(data, mask); 1264 if (ret < 0) 1265 goto done; 1266 1267 if (mask & LTR501_STATUS_ALS_RDY) { 1268 ret = regmap_bulk_read(data->regmap, LTR501_ALS_DATA1, 1269 (u8 *)als_buf, sizeof(als_buf)); 1270 if (ret < 0) 1271 return ret; 1272 if (test_bit(0, indio_dev->active_scan_mask)) 1273 buf[j++] = le16_to_cpu(als_buf[1]); 1274 if (test_bit(1, indio_dev->active_scan_mask)) 1275 buf[j++] = le16_to_cpu(als_buf[0]); 1276 } 1277 1278 if (mask & LTR501_STATUS_PS_RDY) { 1279 ret = regmap_bulk_read(data->regmap, LTR501_PS_DATA, 1280 &psdata, 2); 1281 if (ret < 0) 1282 goto done; 1283 buf[j++] = psdata & LTR501_PS_DATA_MASK; 1284 } 1285 1286 iio_push_to_buffers_with_timestamp(indio_dev, buf, 1287 iio_get_time_ns(indio_dev)); 1288 1289 done: 1290 iio_trigger_notify_done(indio_dev->trig); 1291 1292 return IRQ_HANDLED; 1293 } 1294 1295 static irqreturn_t ltr501_interrupt_handler(int irq, void *private) 1296 { 1297 struct iio_dev *indio_dev = private; 1298 struct ltr501_data *data = iio_priv(indio_dev); 1299 int ret, status; 1300 1301 ret = regmap_read(data->regmap, LTR501_ALS_PS_STATUS, &status); 1302 if (ret < 0) { 1303 dev_err(&data->client->dev, 1304 "irq read int reg failed\n"); 1305 return IRQ_HANDLED; 1306 } 1307 1308 if (status & LTR501_STATUS_ALS_INTR) 1309 iio_push_event(indio_dev, 1310 IIO_UNMOD_EVENT_CODE(IIO_INTENSITY, 0, 1311 IIO_EV_TYPE_THRESH, 1312 IIO_EV_DIR_EITHER), 1313 iio_get_time_ns(indio_dev)); 1314 1315 if (status & LTR501_STATUS_PS_INTR) 1316 iio_push_event(indio_dev, 1317 IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0, 1318 IIO_EV_TYPE_THRESH, 1319 IIO_EV_DIR_EITHER), 1320 iio_get_time_ns(indio_dev)); 1321 1322 return IRQ_HANDLED; 1323 } 1324 1325 static int ltr501_init(struct ltr501_data *data) 1326 { 1327 int ret, status; 1328 1329 ret = regmap_read(data->regmap, LTR501_ALS_CONTR, &status); 1330 if (ret < 0) 1331 return ret; 1332 1333 data->als_contr = status | data->chip_info->als_mode_active; 1334 1335 ret = regmap_read(data->regmap, LTR501_PS_CONTR, &status); 1336 if (ret < 0) 1337 return ret; 1338 1339 data->ps_contr = status | LTR501_CONTR_ACTIVE; 1340 1341 ret = ltr501_read_intr_prst(data, IIO_INTENSITY, &data->als_period); 1342 if (ret < 0) 1343 return ret; 1344 1345 ret = ltr501_read_intr_prst(data, IIO_PROXIMITY, &data->ps_period); 1346 if (ret < 0) 1347 return ret; 1348 1349 return ltr501_write_contr(data, data->als_contr, data->ps_contr); 1350 } 1351 1352 static bool ltr501_is_volatile_reg(struct device *dev, unsigned int reg) 1353 { 1354 switch (reg) { 1355 case LTR501_ALS_DATA1: 1356 case LTR501_ALS_DATA0: 1357 case LTR501_ALS_PS_STATUS: 1358 case LTR501_PS_DATA: 1359 return true; 1360 default: 1361 return false; 1362 } 1363 } 1364 1365 static struct regmap_config ltr501_regmap_config = { 1366 .name = LTR501_REGMAP_NAME, 1367 .reg_bits = 8, 1368 .val_bits = 8, 1369 .max_register = LTR501_MAX_REG, 1370 .cache_type = REGCACHE_RBTREE, 1371 .volatile_reg = ltr501_is_volatile_reg, 1372 }; 1373 1374 static int ltr501_powerdown(struct ltr501_data *data) 1375 { 1376 return ltr501_write_contr(data, data->als_contr & 1377 ~data->chip_info->als_mode_active, 1378 data->ps_contr & ~LTR501_CONTR_ACTIVE); 1379 } 1380 1381 static const char *ltr501_match_acpi_device(struct device *dev, int *chip_idx) 1382 { 1383 const struct acpi_device_id *id; 1384 1385 id = acpi_match_device(dev->driver->acpi_match_table, dev); 1386 if (!id) 1387 return NULL; 1388 *chip_idx = id->driver_data; 1389 return dev_name(dev); 1390 } 1391 1392 static int ltr501_probe(struct i2c_client *client, 1393 const struct i2c_device_id *id) 1394 { 1395 struct ltr501_data *data; 1396 struct iio_dev *indio_dev; 1397 struct regmap *regmap; 1398 int ret, partid, chip_idx = 0; 1399 const char *name = NULL; 1400 1401 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); 1402 if (!indio_dev) 1403 return -ENOMEM; 1404 1405 regmap = devm_regmap_init_i2c(client, <r501_regmap_config); 1406 if (IS_ERR(regmap)) { 1407 dev_err(&client->dev, "Regmap initialization failed.\n"); 1408 return PTR_ERR(regmap); 1409 } 1410 1411 data = iio_priv(indio_dev); 1412 i2c_set_clientdata(client, indio_dev); 1413 data->client = client; 1414 data->regmap = regmap; 1415 mutex_init(&data->lock_als); 1416 mutex_init(&data->lock_ps); 1417 1418 data->reg_it = devm_regmap_field_alloc(&client->dev, regmap, 1419 reg_field_it); 1420 if (IS_ERR(data->reg_it)) { 1421 dev_err(&client->dev, "Integ time reg field init failed.\n"); 1422 return PTR_ERR(data->reg_it); 1423 } 1424 1425 data->reg_als_intr = devm_regmap_field_alloc(&client->dev, regmap, 1426 reg_field_als_intr); 1427 if (IS_ERR(data->reg_als_intr)) { 1428 dev_err(&client->dev, "ALS intr mode reg field init failed\n"); 1429 return PTR_ERR(data->reg_als_intr); 1430 } 1431 1432 data->reg_ps_intr = devm_regmap_field_alloc(&client->dev, regmap, 1433 reg_field_ps_intr); 1434 if (IS_ERR(data->reg_ps_intr)) { 1435 dev_err(&client->dev, "PS intr mode reg field init failed.\n"); 1436 return PTR_ERR(data->reg_ps_intr); 1437 } 1438 1439 data->reg_als_rate = devm_regmap_field_alloc(&client->dev, regmap, 1440 reg_field_als_rate); 1441 if (IS_ERR(data->reg_als_rate)) { 1442 dev_err(&client->dev, "ALS samp rate field init failed.\n"); 1443 return PTR_ERR(data->reg_als_rate); 1444 } 1445 1446 data->reg_ps_rate = devm_regmap_field_alloc(&client->dev, regmap, 1447 reg_field_ps_rate); 1448 if (IS_ERR(data->reg_ps_rate)) { 1449 dev_err(&client->dev, "PS samp rate field init failed.\n"); 1450 return PTR_ERR(data->reg_ps_rate); 1451 } 1452 1453 data->reg_als_prst = devm_regmap_field_alloc(&client->dev, regmap, 1454 reg_field_als_prst); 1455 if (IS_ERR(data->reg_als_prst)) { 1456 dev_err(&client->dev, "ALS prst reg field init failed\n"); 1457 return PTR_ERR(data->reg_als_prst); 1458 } 1459 1460 data->reg_ps_prst = devm_regmap_field_alloc(&client->dev, regmap, 1461 reg_field_ps_prst); 1462 if (IS_ERR(data->reg_ps_prst)) { 1463 dev_err(&client->dev, "PS prst reg field init failed.\n"); 1464 return PTR_ERR(data->reg_ps_prst); 1465 } 1466 1467 ret = regmap_read(data->regmap, LTR501_PART_ID, &partid); 1468 if (ret < 0) 1469 return ret; 1470 1471 if (id) { 1472 name = id->name; 1473 chip_idx = id->driver_data; 1474 } else if (ACPI_HANDLE(&client->dev)) { 1475 name = ltr501_match_acpi_device(&client->dev, &chip_idx); 1476 } else { 1477 return -ENODEV; 1478 } 1479 1480 data->chip_info = <r501_chip_info_tbl[chip_idx]; 1481 1482 if ((partid >> 4) != data->chip_info->partid) 1483 return -ENODEV; 1484 1485 indio_dev->dev.parent = &client->dev; 1486 indio_dev->info = data->chip_info->info; 1487 indio_dev->channels = data->chip_info->channels; 1488 indio_dev->num_channels = data->chip_info->no_channels; 1489 indio_dev->name = name; 1490 indio_dev->modes = INDIO_DIRECT_MODE; 1491 1492 ret = ltr501_init(data); 1493 if (ret < 0) 1494 return ret; 1495 1496 if (client->irq > 0) { 1497 ret = devm_request_threaded_irq(&client->dev, client->irq, 1498 NULL, ltr501_interrupt_handler, 1499 IRQF_TRIGGER_FALLING | 1500 IRQF_ONESHOT, 1501 "ltr501_thresh_event", 1502 indio_dev); 1503 if (ret) { 1504 dev_err(&client->dev, "request irq (%d) failed\n", 1505 client->irq); 1506 return ret; 1507 } 1508 } else { 1509 indio_dev->info = data->chip_info->info_no_irq; 1510 } 1511 1512 ret = iio_triggered_buffer_setup(indio_dev, NULL, 1513 ltr501_trigger_handler, NULL); 1514 if (ret) 1515 goto powerdown_on_error; 1516 1517 ret = iio_device_register(indio_dev); 1518 if (ret) 1519 goto error_unreg_buffer; 1520 1521 return 0; 1522 1523 error_unreg_buffer: 1524 iio_triggered_buffer_cleanup(indio_dev); 1525 powerdown_on_error: 1526 ltr501_powerdown(data); 1527 return ret; 1528 } 1529 1530 static int ltr501_remove(struct i2c_client *client) 1531 { 1532 struct iio_dev *indio_dev = i2c_get_clientdata(client); 1533 1534 iio_device_unregister(indio_dev); 1535 iio_triggered_buffer_cleanup(indio_dev); 1536 ltr501_powerdown(iio_priv(indio_dev)); 1537 1538 return 0; 1539 } 1540 1541 #ifdef CONFIG_PM_SLEEP 1542 static int ltr501_suspend(struct device *dev) 1543 { 1544 struct ltr501_data *data = iio_priv(i2c_get_clientdata( 1545 to_i2c_client(dev))); 1546 return ltr501_powerdown(data); 1547 } 1548 1549 static int ltr501_resume(struct device *dev) 1550 { 1551 struct ltr501_data *data = iio_priv(i2c_get_clientdata( 1552 to_i2c_client(dev))); 1553 1554 return ltr501_write_contr(data, data->als_contr, 1555 data->ps_contr); 1556 } 1557 #endif 1558 1559 static SIMPLE_DEV_PM_OPS(ltr501_pm_ops, ltr501_suspend, ltr501_resume); 1560 1561 static const struct acpi_device_id ltr_acpi_match[] = { 1562 {"LTER0501", ltr501}, 1563 {"LTER0559", ltr559}, 1564 {"LTER0301", ltr301}, 1565 { }, 1566 }; 1567 MODULE_DEVICE_TABLE(acpi, ltr_acpi_match); 1568 1569 static const struct i2c_device_id ltr501_id[] = { 1570 { "ltr501", ltr501}, 1571 { "ltr559", ltr559}, 1572 { "ltr301", ltr301}, 1573 { } 1574 }; 1575 MODULE_DEVICE_TABLE(i2c, ltr501_id); 1576 1577 static struct i2c_driver ltr501_driver = { 1578 .driver = { 1579 .name = LTR501_DRV_NAME, 1580 .pm = <r501_pm_ops, 1581 .acpi_match_table = ACPI_PTR(ltr_acpi_match), 1582 }, 1583 .probe = ltr501_probe, 1584 .remove = ltr501_remove, 1585 .id_table = ltr501_id, 1586 }; 1587 1588 module_i2c_driver(ltr501_driver); 1589 1590 MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>"); 1591 MODULE_DESCRIPTION("Lite-On LTR501 ambient light and proximity sensor driver"); 1592 MODULE_LICENSE("GPL"); 1593