1 /* 2 * Device driver for monitoring ambient light intensity (lux) 3 * within the TAOS tsl258x family of devices (tsl2580, tsl2581, tsl2583). 4 * 5 * Copyright (c) 2011, TAOS Corporation. 6 * Copyright (c) 2016 Brian Masney <masneyb@onstation.org> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, but WITHOUT 14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 16 * more details. 17 */ 18 19 #include <linux/kernel.h> 20 #include <linux/i2c.h> 21 #include <linux/errno.h> 22 #include <linux/delay.h> 23 #include <linux/string.h> 24 #include <linux/mutex.h> 25 #include <linux/unistd.h> 26 #include <linux/slab.h> 27 #include <linux/module.h> 28 #include <linux/iio/iio.h> 29 #include <linux/iio/sysfs.h> 30 31 /* Device Registers and Masks */ 32 #define TSL2583_CNTRL 0x00 33 #define TSL2583_ALS_TIME 0X01 34 #define TSL2583_INTERRUPT 0x02 35 #define TSL2583_GAIN 0x07 36 #define TSL2583_REVID 0x11 37 #define TSL2583_CHIPID 0x12 38 #define TSL2583_ALS_CHAN0LO 0x14 39 #define TSL2583_ALS_CHAN0HI 0x15 40 #define TSL2583_ALS_CHAN1LO 0x16 41 #define TSL2583_ALS_CHAN1HI 0x17 42 #define TSL2583_TMR_LO 0x18 43 #define TSL2583_TMR_HI 0x19 44 45 /* tsl2583 cmd reg masks */ 46 #define TSL2583_CMD_REG 0x80 47 #define TSL2583_CMD_SPL_FN 0x60 48 #define TSL2583_CMD_ALS_INT_CLR 0x01 49 50 /* tsl2583 cntrl reg masks */ 51 #define TSL2583_CNTL_ADC_ENBL 0x02 52 #define TSL2583_CNTL_PWR_OFF 0x00 53 #define TSL2583_CNTL_PWR_ON 0x01 54 55 /* tsl2583 status reg masks */ 56 #define TSL2583_STA_ADC_VALID 0x01 57 #define TSL2583_STA_ADC_INTR 0x10 58 59 /* Lux calculation constants */ 60 #define TSL2583_LUX_CALC_OVER_FLOW 65535 61 62 #define TSL2583_INTERRUPT_DISABLED 0x00 63 64 #define TSL2583_CHIP_ID 0x90 65 #define TSL2583_CHIP_ID_MASK 0xf0 66 67 /* Per-device data */ 68 struct tsl2583_als_info { 69 u16 als_ch0; 70 u16 als_ch1; 71 u16 lux; 72 }; 73 74 struct tsl2583_lux { 75 unsigned int ratio; 76 unsigned int ch0; 77 unsigned int ch1; 78 }; 79 80 static const struct tsl2583_lux tsl2583_default_lux[] = { 81 { 9830, 8520, 15729 }, 82 { 12452, 10807, 23344 }, 83 { 14746, 6383, 11705 }, 84 { 17695, 4063, 6554 }, 85 { 0, 0, 0 } /* Termination segment */ 86 }; 87 88 #define TSL2583_MAX_LUX_TABLE_ENTRIES 11 89 90 struct tsl2583_settings { 91 int als_time; 92 int als_gain; 93 int als_gain_trim; 94 int als_cal_target; 95 96 /* 97 * This structure is intentionally large to accommodate updates via 98 * sysfs. Sized to 11 = max 10 segments + 1 termination segment. 99 * Assumption is that one and only one type of glass used. 100 */ 101 struct tsl2583_lux als_device_lux[TSL2583_MAX_LUX_TABLE_ENTRIES]; 102 }; 103 104 struct tsl2583_chip { 105 struct mutex als_mutex; 106 struct i2c_client *client; 107 struct tsl2583_als_info als_cur_info; 108 struct tsl2583_settings als_settings; 109 int als_time_scale; 110 int als_saturation; 111 bool suspended; 112 }; 113 114 struct gainadj { 115 s16 ch0; 116 s16 ch1; 117 s16 mean; 118 }; 119 120 /* Index = (0 - 3) Used to validate the gain selection index */ 121 static const struct gainadj gainadj[] = { 122 { 1, 1, 1 }, 123 { 8, 8, 8 }, 124 { 16, 16, 16 }, 125 { 107, 115, 111 } 126 }; 127 128 /* 129 * Provides initial operational parameter defaults. 130 * These defaults may be changed through the device's sysfs files. 131 */ 132 static void tsl2583_defaults(struct tsl2583_chip *chip) 133 { 134 /* 135 * The integration time must be a multiple of 50ms and within the 136 * range [50, 600] ms. 137 */ 138 chip->als_settings.als_time = 100; 139 140 /* 141 * This is an index into the gainadj table. Assume clear glass as the 142 * default. 143 */ 144 chip->als_settings.als_gain = 0; 145 146 /* Default gain trim to account for aperture effects */ 147 chip->als_settings.als_gain_trim = 1000; 148 149 /* Known external ALS reading used for calibration */ 150 chip->als_settings.als_cal_target = 130; 151 152 /* Default lux table. */ 153 memcpy(chip->als_settings.als_device_lux, tsl2583_default_lux, 154 sizeof(tsl2583_default_lux)); 155 } 156 157 /* 158 * Reads and calculates current lux value. 159 * The raw ch0 and ch1 values of the ambient light sensed in the last 160 * integration cycle are read from the device. 161 * Time scale factor array values are adjusted based on the integration time. 162 * The raw values are multiplied by a scale factor, and device gain is obtained 163 * using gain index. Limit checks are done next, then the ratio of a multiple 164 * of ch1 value, to the ch0 value, is calculated. The array als_device_lux[] 165 * declared above is then scanned to find the first ratio value that is just 166 * above the ratio we just calculated. The ch0 and ch1 multiplier constants in 167 * the array are then used along with the time scale factor array values, to 168 * calculate the lux. 169 */ 170 static int tsl2583_get_lux(struct iio_dev *indio_dev) 171 { 172 u16 ch0, ch1; /* separated ch0/ch1 data from device */ 173 u32 lux; /* raw lux calculated from device data */ 174 u64 lux64; 175 u32 ratio; 176 u8 buf[5]; 177 struct tsl2583_lux *p; 178 struct tsl2583_chip *chip = iio_priv(indio_dev); 179 int i, ret; 180 181 ret = i2c_smbus_read_byte_data(chip->client, TSL2583_CMD_REG); 182 if (ret < 0) { 183 dev_err(&chip->client->dev, "%s: failed to read CMD_REG register\n", 184 __func__); 185 goto done; 186 } 187 188 /* is data new & valid */ 189 if (!(ret & TSL2583_STA_ADC_INTR)) { 190 dev_err(&chip->client->dev, "%s: data not valid; returning last value\n", 191 __func__); 192 ret = chip->als_cur_info.lux; /* return LAST VALUE */ 193 goto done; 194 } 195 196 for (i = 0; i < 4; i++) { 197 int reg = TSL2583_CMD_REG | (TSL2583_ALS_CHAN0LO + i); 198 199 ret = i2c_smbus_read_byte_data(chip->client, reg); 200 if (ret < 0) { 201 dev_err(&chip->client->dev, "%s: failed to read register %x\n", 202 __func__, reg); 203 goto done; 204 } 205 buf[i] = ret; 206 } 207 208 /* 209 * Clear the pending interrupt status bit on the chip to allow the next 210 * integration cycle to start. This has to be done even though this 211 * driver currently does not support interrupts. 212 */ 213 ret = i2c_smbus_write_byte(chip->client, 214 (TSL2583_CMD_REG | TSL2583_CMD_SPL_FN | 215 TSL2583_CMD_ALS_INT_CLR)); 216 if (ret < 0) { 217 dev_err(&chip->client->dev, "%s: failed to clear the interrupt bit\n", 218 __func__); 219 goto done; /* have no data, so return failure */ 220 } 221 222 /* extract ALS/lux data */ 223 ch0 = le16_to_cpup((const __le16 *)&buf[0]); 224 ch1 = le16_to_cpup((const __le16 *)&buf[2]); 225 226 chip->als_cur_info.als_ch0 = ch0; 227 chip->als_cur_info.als_ch1 = ch1; 228 229 if ((ch0 >= chip->als_saturation) || (ch1 >= chip->als_saturation)) 230 goto return_max; 231 232 if (!ch0) { 233 /* 234 * The sensor appears to be in total darkness so set the 235 * calculated lux to 0 and return early to avoid a division by 236 * zero below when calculating the ratio. 237 */ 238 ret = 0; 239 chip->als_cur_info.lux = 0; 240 goto done; 241 } 242 243 /* calculate ratio */ 244 ratio = (ch1 << 15) / ch0; 245 246 /* convert to unscaled lux using the pointer to the table */ 247 for (p = (struct tsl2583_lux *)chip->als_settings.als_device_lux; 248 p->ratio != 0 && p->ratio < ratio; p++) 249 ; 250 251 if (p->ratio == 0) { 252 lux = 0; 253 } else { 254 u32 ch0lux, ch1lux; 255 256 ch0lux = ((ch0 * p->ch0) + 257 (gainadj[chip->als_settings.als_gain].ch0 >> 1)) 258 / gainadj[chip->als_settings.als_gain].ch0; 259 ch1lux = ((ch1 * p->ch1) + 260 (gainadj[chip->als_settings.als_gain].ch1 >> 1)) 261 / gainadj[chip->als_settings.als_gain].ch1; 262 263 /* note: lux is 31 bit max at this point */ 264 if (ch1lux > ch0lux) { 265 dev_dbg(&chip->client->dev, "%s: No Data - Returning 0\n", 266 __func__); 267 ret = 0; 268 chip->als_cur_info.lux = 0; 269 goto done; 270 } 271 272 lux = ch0lux - ch1lux; 273 } 274 275 /* adjust for active time scale */ 276 if (chip->als_time_scale == 0) 277 lux = 0; 278 else 279 lux = (lux + (chip->als_time_scale >> 1)) / 280 chip->als_time_scale; 281 282 /* 283 * Adjust for active gain scale. 284 * The tsl2583_default_lux tables above have a factor of 8192 built in, 285 * so we need to shift right. 286 * User-specified gain provides a multiplier. 287 * Apply user-specified gain before shifting right to retain precision. 288 * Use 64 bits to avoid overflow on multiplication. 289 * Then go back to 32 bits before division to avoid using div_u64(). 290 */ 291 lux64 = lux; 292 lux64 = lux64 * chip->als_settings.als_gain_trim; 293 lux64 >>= 13; 294 lux = lux64; 295 lux = (lux + 500) / 1000; 296 297 if (lux > TSL2583_LUX_CALC_OVER_FLOW) { /* check for overflow */ 298 return_max: 299 lux = TSL2583_LUX_CALC_OVER_FLOW; 300 } 301 302 /* Update the structure with the latest VALID lux. */ 303 chip->als_cur_info.lux = lux; 304 ret = lux; 305 306 done: 307 return ret; 308 } 309 310 /* 311 * Obtain single reading and calculate the als_gain_trim (later used 312 * to derive actual lux). 313 * Return updated gain_trim value. 314 */ 315 static int tsl2583_als_calibrate(struct iio_dev *indio_dev) 316 { 317 struct tsl2583_chip *chip = iio_priv(indio_dev); 318 unsigned int gain_trim_val; 319 int ret; 320 int lux_val; 321 322 ret = i2c_smbus_read_byte_data(chip->client, 323 TSL2583_CMD_REG | TSL2583_CNTRL); 324 if (ret < 0) { 325 dev_err(&chip->client->dev, 326 "%s: failed to read from the CNTRL register\n", 327 __func__); 328 return ret; 329 } 330 331 if ((ret & (TSL2583_CNTL_ADC_ENBL | TSL2583_CNTL_PWR_ON)) 332 != (TSL2583_CNTL_ADC_ENBL | TSL2583_CNTL_PWR_ON)) { 333 dev_err(&chip->client->dev, 334 "%s: Device is not powered on and/or ADC is not enabled\n", 335 __func__); 336 return -EINVAL; 337 } else if ((ret & TSL2583_STA_ADC_VALID) != TSL2583_STA_ADC_VALID) { 338 dev_err(&chip->client->dev, 339 "%s: The two ADC channels have not completed an integration cycle\n", 340 __func__); 341 return -ENODATA; 342 } 343 344 lux_val = tsl2583_get_lux(indio_dev); 345 if (lux_val < 0) { 346 dev_err(&chip->client->dev, "%s: failed to get lux\n", 347 __func__); 348 return lux_val; 349 } 350 351 gain_trim_val = (unsigned int)(((chip->als_settings.als_cal_target) 352 * chip->als_settings.als_gain_trim) / lux_val); 353 if ((gain_trim_val < 250) || (gain_trim_val > 4000)) { 354 dev_err(&chip->client->dev, 355 "%s: trim_val of %d is not within the range [250, 4000]\n", 356 __func__, gain_trim_val); 357 return -ENODATA; 358 } 359 360 chip->als_settings.als_gain_trim = (int)gain_trim_val; 361 362 return 0; 363 } 364 365 static int tsl2583_set_als_time(struct tsl2583_chip *chip) 366 { 367 int als_count, als_time, ret; 368 u8 val; 369 370 /* determine als integration register */ 371 als_count = (chip->als_settings.als_time * 100 + 135) / 270; 372 if (!als_count) 373 als_count = 1; /* ensure at least one cycle */ 374 375 /* convert back to time (encompasses overrides) */ 376 als_time = (als_count * 27 + 5) / 10; 377 378 val = 256 - als_count; 379 ret = i2c_smbus_write_byte_data(chip->client, 380 TSL2583_CMD_REG | TSL2583_ALS_TIME, 381 val); 382 if (ret < 0) { 383 dev_err(&chip->client->dev, "%s: failed to set the als time to %d\n", 384 __func__, val); 385 return ret; 386 } 387 388 /* set chip struct re scaling and saturation */ 389 chip->als_saturation = als_count * 922; /* 90% of full scale */ 390 chip->als_time_scale = (als_time + 25) / 50; 391 392 return ret; 393 } 394 395 static int tsl2583_set_als_gain(struct tsl2583_chip *chip) 396 { 397 int ret; 398 399 /* Set the gain based on als_settings struct */ 400 ret = i2c_smbus_write_byte_data(chip->client, 401 TSL2583_CMD_REG | TSL2583_GAIN, 402 chip->als_settings.als_gain); 403 if (ret < 0) 404 dev_err(&chip->client->dev, 405 "%s: failed to set the gain to %d\n", __func__, 406 chip->als_settings.als_gain); 407 408 return ret; 409 } 410 411 static int tsl2583_set_power_state(struct tsl2583_chip *chip, u8 state) 412 { 413 int ret; 414 415 ret = i2c_smbus_write_byte_data(chip->client, 416 TSL2583_CMD_REG | TSL2583_CNTRL, state); 417 if (ret < 0) 418 dev_err(&chip->client->dev, 419 "%s: failed to set the power state to %d\n", __func__, 420 state); 421 422 return ret; 423 } 424 425 /* 426 * Turn the device on. 427 * Configuration must be set before calling this function. 428 */ 429 static int tsl2583_chip_init_and_power_on(struct iio_dev *indio_dev) 430 { 431 struct tsl2583_chip *chip = iio_priv(indio_dev); 432 int ret; 433 434 /* Power on the device; ADC off. */ 435 ret = tsl2583_set_power_state(chip, TSL2583_CNTL_PWR_ON); 436 if (ret < 0) 437 return ret; 438 439 ret = i2c_smbus_write_byte_data(chip->client, 440 TSL2583_CMD_REG | TSL2583_INTERRUPT, 441 TSL2583_INTERRUPT_DISABLED); 442 if (ret < 0) { 443 dev_err(&chip->client->dev, 444 "%s: failed to disable interrupts\n", __func__); 445 return ret; 446 } 447 448 ret = tsl2583_set_als_time(chip); 449 if (ret < 0) 450 return ret; 451 452 ret = tsl2583_set_als_gain(chip); 453 if (ret < 0) 454 return ret; 455 456 usleep_range(3000, 3500); 457 458 ret = tsl2583_set_power_state(chip, TSL2583_CNTL_PWR_ON | 459 TSL2583_CNTL_ADC_ENBL); 460 if (ret < 0) 461 return ret; 462 463 chip->suspended = false; 464 465 return ret; 466 } 467 468 /* Sysfs Interface Functions */ 469 470 static ssize_t in_illuminance_input_target_show(struct device *dev, 471 struct device_attribute *attr, 472 char *buf) 473 { 474 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 475 struct tsl2583_chip *chip = iio_priv(indio_dev); 476 int ret; 477 478 mutex_lock(&chip->als_mutex); 479 ret = sprintf(buf, "%d\n", chip->als_settings.als_cal_target); 480 mutex_unlock(&chip->als_mutex); 481 482 return ret; 483 } 484 485 static ssize_t in_illuminance_input_target_store(struct device *dev, 486 struct device_attribute *attr, 487 const char *buf, size_t len) 488 { 489 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 490 struct tsl2583_chip *chip = iio_priv(indio_dev); 491 int value; 492 493 if (kstrtoint(buf, 0, &value) || !value) 494 return -EINVAL; 495 496 mutex_lock(&chip->als_mutex); 497 chip->als_settings.als_cal_target = value; 498 mutex_unlock(&chip->als_mutex); 499 500 return len; 501 } 502 503 static ssize_t in_illuminance_calibrate_store(struct device *dev, 504 struct device_attribute *attr, 505 const char *buf, size_t len) 506 { 507 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 508 struct tsl2583_chip *chip = iio_priv(indio_dev); 509 int value, ret; 510 511 if (kstrtoint(buf, 0, &value) || value != 1) 512 return -EINVAL; 513 514 mutex_lock(&chip->als_mutex); 515 516 if (chip->suspended) { 517 ret = -EBUSY; 518 goto done; 519 } 520 521 ret = tsl2583_als_calibrate(indio_dev); 522 if (ret < 0) 523 goto done; 524 525 ret = len; 526 done: 527 mutex_unlock(&chip->als_mutex); 528 529 return ret; 530 } 531 532 static ssize_t in_illuminance_lux_table_show(struct device *dev, 533 struct device_attribute *attr, 534 char *buf) 535 { 536 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 537 struct tsl2583_chip *chip = iio_priv(indio_dev); 538 unsigned int i; 539 int offset = 0; 540 541 for (i = 0; i < ARRAY_SIZE(chip->als_settings.als_device_lux); i++) { 542 offset += sprintf(buf + offset, "%u,%u,%u,", 543 chip->als_settings.als_device_lux[i].ratio, 544 chip->als_settings.als_device_lux[i].ch0, 545 chip->als_settings.als_device_lux[i].ch1); 546 if (chip->als_settings.als_device_lux[i].ratio == 0) { 547 /* 548 * We just printed the first "0" entry. 549 * Now get rid of the extra "," and break. 550 */ 551 offset--; 552 break; 553 } 554 } 555 556 offset += sprintf(buf + offset, "\n"); 557 558 return offset; 559 } 560 561 static ssize_t in_illuminance_lux_table_store(struct device *dev, 562 struct device_attribute *attr, 563 const char *buf, size_t len) 564 { 565 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 566 struct tsl2583_chip *chip = iio_priv(indio_dev); 567 const unsigned int max_ints = TSL2583_MAX_LUX_TABLE_ENTRIES * 3; 568 int value[TSL2583_MAX_LUX_TABLE_ENTRIES * 3 + 1]; 569 int ret = -EINVAL; 570 unsigned int n; 571 572 mutex_lock(&chip->als_mutex); 573 574 get_options(buf, ARRAY_SIZE(value), value); 575 576 /* 577 * We now have an array of ints starting at value[1], and 578 * enumerated by value[0]. 579 * We expect each group of three ints is one table entry, 580 * and the last table entry is all 0. 581 */ 582 n = value[0]; 583 if ((n % 3) || n < 6 || n > max_ints) { 584 dev_err(dev, 585 "%s: The number of entries in the lux table must be a multiple of 3 and within the range [6, %d]\n", 586 __func__, max_ints); 587 goto done; 588 } 589 if ((value[n - 2] | value[n - 1] | value[n]) != 0) { 590 dev_err(dev, "%s: The last 3 entries in the lux table must be zeros.\n", 591 __func__); 592 goto done; 593 } 594 595 memcpy(chip->als_settings.als_device_lux, &value[1], 596 value[0] * sizeof(value[1])); 597 598 ret = len; 599 600 done: 601 mutex_unlock(&chip->als_mutex); 602 603 return ret; 604 } 605 606 static IIO_CONST_ATTR(in_illuminance_calibscale_available, "1 8 16 111"); 607 static IIO_CONST_ATTR(in_illuminance_integration_time_available, 608 "0.000050 0.000100 0.000150 0.000200 0.000250 0.000300 0.000350 0.000400 0.000450 0.000500 0.000550 0.000600 0.000650"); 609 static IIO_DEVICE_ATTR_RW(in_illuminance_input_target, 0); 610 static IIO_DEVICE_ATTR_WO(in_illuminance_calibrate, 0); 611 static IIO_DEVICE_ATTR_RW(in_illuminance_lux_table, 0); 612 613 static struct attribute *sysfs_attrs_ctrl[] = { 614 &iio_const_attr_in_illuminance_calibscale_available.dev_attr.attr, 615 &iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr, 616 &iio_dev_attr_in_illuminance_input_target.dev_attr.attr, 617 &iio_dev_attr_in_illuminance_calibrate.dev_attr.attr, 618 &iio_dev_attr_in_illuminance_lux_table.dev_attr.attr, 619 NULL 620 }; 621 622 static const struct attribute_group tsl2583_attribute_group = { 623 .attrs = sysfs_attrs_ctrl, 624 }; 625 626 static const struct iio_chan_spec tsl2583_channels[] = { 627 { 628 .type = IIO_LIGHT, 629 .modified = 1, 630 .channel2 = IIO_MOD_LIGHT_IR, 631 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 632 }, 633 { 634 .type = IIO_LIGHT, 635 .modified = 1, 636 .channel2 = IIO_MOD_LIGHT_BOTH, 637 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 638 }, 639 { 640 .type = IIO_LIGHT, 641 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) | 642 BIT(IIO_CHAN_INFO_CALIBBIAS) | 643 BIT(IIO_CHAN_INFO_CALIBSCALE) | 644 BIT(IIO_CHAN_INFO_INT_TIME), 645 }, 646 }; 647 648 static int tsl2583_read_raw(struct iio_dev *indio_dev, 649 struct iio_chan_spec const *chan, 650 int *val, int *val2, long mask) 651 { 652 struct tsl2583_chip *chip = iio_priv(indio_dev); 653 int ret = -EINVAL; 654 655 mutex_lock(&chip->als_mutex); 656 657 if (chip->suspended) { 658 ret = -EBUSY; 659 goto read_done; 660 } 661 662 switch (mask) { 663 case IIO_CHAN_INFO_RAW: 664 if (chan->type == IIO_LIGHT) { 665 ret = tsl2583_get_lux(indio_dev); 666 if (ret < 0) 667 goto read_done; 668 669 /* 670 * From page 20 of the TSL2581, TSL2583 data 671 * sheet (TAOS134 − MARCH 2011): 672 * 673 * One of the photodiodes (channel 0) is 674 * sensitive to both visible and infrared light, 675 * while the second photodiode (channel 1) is 676 * sensitive primarily to infrared light. 677 */ 678 if (chan->channel2 == IIO_MOD_LIGHT_BOTH) 679 *val = chip->als_cur_info.als_ch0; 680 else 681 *val = chip->als_cur_info.als_ch1; 682 683 ret = IIO_VAL_INT; 684 } 685 break; 686 case IIO_CHAN_INFO_PROCESSED: 687 if (chan->type == IIO_LIGHT) { 688 ret = tsl2583_get_lux(indio_dev); 689 if (ret < 0) 690 goto read_done; 691 692 *val = ret; 693 ret = IIO_VAL_INT; 694 } 695 break; 696 case IIO_CHAN_INFO_CALIBBIAS: 697 if (chan->type == IIO_LIGHT) { 698 *val = chip->als_settings.als_gain_trim; 699 ret = IIO_VAL_INT; 700 } 701 break; 702 case IIO_CHAN_INFO_CALIBSCALE: 703 if (chan->type == IIO_LIGHT) { 704 *val = gainadj[chip->als_settings.als_gain].mean; 705 ret = IIO_VAL_INT; 706 } 707 break; 708 case IIO_CHAN_INFO_INT_TIME: 709 if (chan->type == IIO_LIGHT) { 710 *val = 0; 711 *val2 = chip->als_settings.als_time; 712 ret = IIO_VAL_INT_PLUS_MICRO; 713 } 714 break; 715 default: 716 break; 717 } 718 719 read_done: 720 mutex_unlock(&chip->als_mutex); 721 722 return ret; 723 } 724 725 static int tsl2583_write_raw(struct iio_dev *indio_dev, 726 struct iio_chan_spec const *chan, 727 int val, int val2, long mask) 728 { 729 struct tsl2583_chip *chip = iio_priv(indio_dev); 730 int ret = -EINVAL; 731 732 mutex_lock(&chip->als_mutex); 733 734 if (chip->suspended) { 735 ret = -EBUSY; 736 goto write_done; 737 } 738 739 switch (mask) { 740 case IIO_CHAN_INFO_CALIBBIAS: 741 if (chan->type == IIO_LIGHT) { 742 chip->als_settings.als_gain_trim = val; 743 ret = 0; 744 } 745 break; 746 case IIO_CHAN_INFO_CALIBSCALE: 747 if (chan->type == IIO_LIGHT) { 748 unsigned int i; 749 750 for (i = 0; i < ARRAY_SIZE(gainadj); i++) { 751 if (gainadj[i].mean == val) { 752 chip->als_settings.als_gain = i; 753 ret = tsl2583_set_als_gain(chip); 754 break; 755 } 756 } 757 } 758 break; 759 case IIO_CHAN_INFO_INT_TIME: 760 if (chan->type == IIO_LIGHT && !val && val2 >= 50 && 761 val2 <= 650 && !(val2 % 50)) { 762 chip->als_settings.als_time = val2; 763 ret = tsl2583_set_als_time(chip); 764 } 765 break; 766 default: 767 break; 768 } 769 770 write_done: 771 mutex_unlock(&chip->als_mutex); 772 773 return ret; 774 } 775 776 static const struct iio_info tsl2583_info = { 777 .attrs = &tsl2583_attribute_group, 778 .driver_module = THIS_MODULE, 779 .read_raw = tsl2583_read_raw, 780 .write_raw = tsl2583_write_raw, 781 }; 782 783 static int tsl2583_probe(struct i2c_client *clientp, 784 const struct i2c_device_id *idp) 785 { 786 int ret; 787 struct tsl2583_chip *chip; 788 struct iio_dev *indio_dev; 789 790 if (!i2c_check_functionality(clientp->adapter, 791 I2C_FUNC_SMBUS_BYTE_DATA)) { 792 dev_err(&clientp->dev, "%s: i2c smbus byte data functionality is unsupported\n", 793 __func__); 794 return -EOPNOTSUPP; 795 } 796 797 indio_dev = devm_iio_device_alloc(&clientp->dev, sizeof(*chip)); 798 if (!indio_dev) 799 return -ENOMEM; 800 801 chip = iio_priv(indio_dev); 802 chip->client = clientp; 803 i2c_set_clientdata(clientp, indio_dev); 804 805 mutex_init(&chip->als_mutex); 806 chip->suspended = true; 807 808 ret = i2c_smbus_read_byte_data(clientp, 809 TSL2583_CMD_REG | TSL2583_CHIPID); 810 if (ret < 0) { 811 dev_err(&clientp->dev, 812 "%s: failed to read the chip ID register\n", __func__); 813 return ret; 814 } 815 816 if ((ret & TSL2583_CHIP_ID_MASK) != TSL2583_CHIP_ID) { 817 dev_err(&clientp->dev, "%s: received an unknown chip ID %x\n", 818 __func__, ret); 819 return -EINVAL; 820 } 821 822 indio_dev->info = &tsl2583_info; 823 indio_dev->channels = tsl2583_channels; 824 indio_dev->num_channels = ARRAY_SIZE(tsl2583_channels); 825 indio_dev->dev.parent = &clientp->dev; 826 indio_dev->modes = INDIO_DIRECT_MODE; 827 indio_dev->name = chip->client->name; 828 829 ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev); 830 if (ret) { 831 dev_err(&clientp->dev, "%s: iio registration failed\n", 832 __func__); 833 return ret; 834 } 835 836 /* Load up the V2 defaults (these are hard coded defaults for now) */ 837 tsl2583_defaults(chip); 838 839 /* Make sure the chip is on */ 840 ret = tsl2583_chip_init_and_power_on(indio_dev); 841 if (ret < 0) 842 return ret; 843 844 dev_info(&clientp->dev, "Light sensor found.\n"); 845 846 return 0; 847 } 848 849 static int __maybe_unused tsl2583_suspend(struct device *dev) 850 { 851 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 852 struct tsl2583_chip *chip = iio_priv(indio_dev); 853 int ret; 854 855 mutex_lock(&chip->als_mutex); 856 857 ret = tsl2583_set_power_state(chip, TSL2583_CNTL_PWR_OFF); 858 chip->suspended = true; 859 860 mutex_unlock(&chip->als_mutex); 861 862 return ret; 863 } 864 865 static int __maybe_unused tsl2583_resume(struct device *dev) 866 { 867 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 868 struct tsl2583_chip *chip = iio_priv(indio_dev); 869 int ret; 870 871 mutex_lock(&chip->als_mutex); 872 873 ret = tsl2583_chip_init_and_power_on(indio_dev); 874 875 mutex_unlock(&chip->als_mutex); 876 877 return ret; 878 } 879 880 static SIMPLE_DEV_PM_OPS(tsl2583_pm_ops, tsl2583_suspend, tsl2583_resume); 881 882 static struct i2c_device_id tsl2583_idtable[] = { 883 { "tsl2580", 0 }, 884 { "tsl2581", 1 }, 885 { "tsl2583", 2 }, 886 {} 887 }; 888 MODULE_DEVICE_TABLE(i2c, tsl2583_idtable); 889 890 static const struct of_device_id tsl2583_of_match[] = { 891 { .compatible = "amstaos,tsl2580", }, 892 { .compatible = "amstaos,tsl2581", }, 893 { .compatible = "amstaos,tsl2583", }, 894 { }, 895 }; 896 MODULE_DEVICE_TABLE(of, tsl2583_of_match); 897 898 /* Driver definition */ 899 static struct i2c_driver tsl2583_driver = { 900 .driver = { 901 .name = "tsl2583", 902 .pm = &tsl2583_pm_ops, 903 .of_match_table = tsl2583_of_match, 904 }, 905 .id_table = tsl2583_idtable, 906 .probe = tsl2583_probe, 907 }; 908 module_i2c_driver(tsl2583_driver); 909 910 MODULE_AUTHOR("J. August Brenner <jbrenner@taosinc.com>"); 911 MODULE_AUTHOR("Brian Masney <masneyb@onstation.org>"); 912 MODULE_DESCRIPTION("TAOS tsl2583 ambient light sensor driver"); 913 MODULE_LICENSE("GPL"); 914