1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * drivers/iio/light/tsl2563.c 4 * 5 * Copyright (C) 2008 Nokia Corporation 6 * 7 * Written by Timo O. Karjalainen <timo.o.karjalainen@nokia.com> 8 * Contact: Amit Kucheria <amit.kucheria@verdurent.com> 9 * 10 * Converted to IIO driver 11 * Amit Kucheria <amit.kucheria@verdurent.com> 12 */ 13 14 #include <linux/module.h> 15 #include <linux/i2c.h> 16 #include <linux/interrupt.h> 17 #include <linux/irq.h> 18 #include <linux/sched.h> 19 #include <linux/mutex.h> 20 #include <linux/delay.h> 21 #include <linux/pm.h> 22 #include <linux/err.h> 23 #include <linux/slab.h> 24 25 #include <linux/iio/iio.h> 26 #include <linux/iio/sysfs.h> 27 #include <linux/iio/events.h> 28 #include <linux/platform_data/tsl2563.h> 29 30 /* Use this many bits for fraction part. */ 31 #define ADC_FRAC_BITS 14 32 33 /* Given number of 1/10000's in ADC_FRAC_BITS precision. */ 34 #define FRAC10K(f) (((f) * (1L << (ADC_FRAC_BITS))) / (10000)) 35 36 /* Bits used for fraction in calibration coefficients.*/ 37 #define CALIB_FRAC_BITS 10 38 /* 0.5 in CALIB_FRAC_BITS precision */ 39 #define CALIB_FRAC_HALF (1 << (CALIB_FRAC_BITS - 1)) 40 /* Make a fraction from a number n that was multiplied with b. */ 41 #define CALIB_FRAC(n, b) (((n) << CALIB_FRAC_BITS) / (b)) 42 /* Decimal 10^(digits in sysfs presentation) */ 43 #define CALIB_BASE_SYSFS 1000 44 45 #define TSL2563_CMD 0x80 46 #define TSL2563_CLEARINT 0x40 47 48 #define TSL2563_REG_CTRL 0x00 49 #define TSL2563_REG_TIMING 0x01 50 #define TSL2563_REG_LOWLOW 0x02 /* data0 low threshold, 2 bytes */ 51 #define TSL2563_REG_LOWHIGH 0x03 52 #define TSL2563_REG_HIGHLOW 0x04 /* data0 high threshold, 2 bytes */ 53 #define TSL2563_REG_HIGHHIGH 0x05 54 #define TSL2563_REG_INT 0x06 55 #define TSL2563_REG_ID 0x0a 56 #define TSL2563_REG_DATA0LOW 0x0c /* broadband sensor value, 2 bytes */ 57 #define TSL2563_REG_DATA0HIGH 0x0d 58 #define TSL2563_REG_DATA1LOW 0x0e /* infrared sensor value, 2 bytes */ 59 #define TSL2563_REG_DATA1HIGH 0x0f 60 61 #define TSL2563_CMD_POWER_ON 0x03 62 #define TSL2563_CMD_POWER_OFF 0x00 63 #define TSL2563_CTRL_POWER_MASK 0x03 64 65 #define TSL2563_TIMING_13MS 0x00 66 #define TSL2563_TIMING_100MS 0x01 67 #define TSL2563_TIMING_400MS 0x02 68 #define TSL2563_TIMING_MASK 0x03 69 #define TSL2563_TIMING_GAIN16 0x10 70 #define TSL2563_TIMING_GAIN1 0x00 71 72 #define TSL2563_INT_DISABLED 0x00 73 #define TSL2563_INT_LEVEL 0x10 74 #define TSL2563_INT_PERSIST(n) ((n) & 0x0F) 75 76 struct tsl2563_gainlevel_coeff { 77 u8 gaintime; 78 u16 min; 79 u16 max; 80 }; 81 82 static const struct tsl2563_gainlevel_coeff tsl2563_gainlevel_table[] = { 83 { 84 .gaintime = TSL2563_TIMING_400MS | TSL2563_TIMING_GAIN16, 85 .min = 0, 86 .max = 65534, 87 }, { 88 .gaintime = TSL2563_TIMING_400MS | TSL2563_TIMING_GAIN1, 89 .min = 2048, 90 .max = 65534, 91 }, { 92 .gaintime = TSL2563_TIMING_100MS | TSL2563_TIMING_GAIN1, 93 .min = 4095, 94 .max = 37177, 95 }, { 96 .gaintime = TSL2563_TIMING_13MS | TSL2563_TIMING_GAIN1, 97 .min = 3000, 98 .max = 65535, 99 }, 100 }; 101 102 struct tsl2563_chip { 103 struct mutex lock; 104 struct i2c_client *client; 105 struct delayed_work poweroff_work; 106 107 /* Remember state for suspend and resume functions */ 108 bool suspended; 109 110 struct tsl2563_gainlevel_coeff const *gainlevel; 111 112 u16 low_thres; 113 u16 high_thres; 114 u8 intr; 115 bool int_enabled; 116 117 /* Calibration coefficients */ 118 u32 calib0; 119 u32 calib1; 120 int cover_comp_gain; 121 122 /* Cache current values, to be returned while suspended */ 123 u32 data0; 124 u32 data1; 125 }; 126 127 static int tsl2563_set_power(struct tsl2563_chip *chip, int on) 128 { 129 struct i2c_client *client = chip->client; 130 u8 cmd; 131 132 cmd = on ? TSL2563_CMD_POWER_ON : TSL2563_CMD_POWER_OFF; 133 return i2c_smbus_write_byte_data(client, 134 TSL2563_CMD | TSL2563_REG_CTRL, cmd); 135 } 136 137 /* 138 * Return value is 0 for off, 1 for on, or a negative error 139 * code if reading failed. 140 */ 141 static int tsl2563_get_power(struct tsl2563_chip *chip) 142 { 143 struct i2c_client *client = chip->client; 144 int ret; 145 146 ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_CTRL); 147 if (ret < 0) 148 return ret; 149 150 return (ret & TSL2563_CTRL_POWER_MASK) == TSL2563_CMD_POWER_ON; 151 } 152 153 static int tsl2563_configure(struct tsl2563_chip *chip) 154 { 155 int ret; 156 157 ret = i2c_smbus_write_byte_data(chip->client, 158 TSL2563_CMD | TSL2563_REG_TIMING, 159 chip->gainlevel->gaintime); 160 if (ret) 161 goto error_ret; 162 ret = i2c_smbus_write_byte_data(chip->client, 163 TSL2563_CMD | TSL2563_REG_HIGHLOW, 164 chip->high_thres & 0xFF); 165 if (ret) 166 goto error_ret; 167 ret = i2c_smbus_write_byte_data(chip->client, 168 TSL2563_CMD | TSL2563_REG_HIGHHIGH, 169 (chip->high_thres >> 8) & 0xFF); 170 if (ret) 171 goto error_ret; 172 ret = i2c_smbus_write_byte_data(chip->client, 173 TSL2563_CMD | TSL2563_REG_LOWLOW, 174 chip->low_thres & 0xFF); 175 if (ret) 176 goto error_ret; 177 ret = i2c_smbus_write_byte_data(chip->client, 178 TSL2563_CMD | TSL2563_REG_LOWHIGH, 179 (chip->low_thres >> 8) & 0xFF); 180 /* 181 * Interrupt register is automatically written anyway if it is relevant 182 * so is not here. 183 */ 184 error_ret: 185 return ret; 186 } 187 188 static void tsl2563_poweroff_work(struct work_struct *work) 189 { 190 struct tsl2563_chip *chip = 191 container_of(work, struct tsl2563_chip, poweroff_work.work); 192 tsl2563_set_power(chip, 0); 193 } 194 195 static int tsl2563_detect(struct tsl2563_chip *chip) 196 { 197 int ret; 198 199 ret = tsl2563_set_power(chip, 1); 200 if (ret) 201 return ret; 202 203 ret = tsl2563_get_power(chip); 204 if (ret < 0) 205 return ret; 206 207 return ret ? 0 : -ENODEV; 208 } 209 210 static int tsl2563_read_id(struct tsl2563_chip *chip, u8 *id) 211 { 212 struct i2c_client *client = chip->client; 213 int ret; 214 215 ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_ID); 216 if (ret < 0) 217 return ret; 218 219 *id = ret; 220 221 return 0; 222 } 223 224 /* 225 * "Normalized" ADC value is one obtained with 400ms of integration time and 226 * 16x gain. This function returns the number of bits of shift needed to 227 * convert between normalized values and HW values obtained using given 228 * timing and gain settings. 229 */ 230 static int tsl2563_adc_shiftbits(u8 timing) 231 { 232 int shift = 0; 233 234 switch (timing & TSL2563_TIMING_MASK) { 235 case TSL2563_TIMING_13MS: 236 shift += 5; 237 break; 238 case TSL2563_TIMING_100MS: 239 shift += 2; 240 break; 241 case TSL2563_TIMING_400MS: 242 /* no-op */ 243 break; 244 } 245 246 if (!(timing & TSL2563_TIMING_GAIN16)) 247 shift += 4; 248 249 return shift; 250 } 251 252 /* Convert a HW ADC value to normalized scale. */ 253 static u32 tsl2563_normalize_adc(u16 adc, u8 timing) 254 { 255 return adc << tsl2563_adc_shiftbits(timing); 256 } 257 258 static void tsl2563_wait_adc(struct tsl2563_chip *chip) 259 { 260 unsigned int delay; 261 262 switch (chip->gainlevel->gaintime & TSL2563_TIMING_MASK) { 263 case TSL2563_TIMING_13MS: 264 delay = 14; 265 break; 266 case TSL2563_TIMING_100MS: 267 delay = 101; 268 break; 269 default: 270 delay = 402; 271 } 272 /* 273 * TODO: Make sure that we wait at least required delay but why we 274 * have to extend it one tick more? 275 */ 276 schedule_timeout_interruptible(msecs_to_jiffies(delay) + 2); 277 } 278 279 static int tsl2563_adjust_gainlevel(struct tsl2563_chip *chip, u16 adc) 280 { 281 struct i2c_client *client = chip->client; 282 283 if (adc > chip->gainlevel->max || adc < chip->gainlevel->min) { 284 285 (adc > chip->gainlevel->max) ? 286 chip->gainlevel++ : chip->gainlevel--; 287 288 i2c_smbus_write_byte_data(client, 289 TSL2563_CMD | TSL2563_REG_TIMING, 290 chip->gainlevel->gaintime); 291 292 tsl2563_wait_adc(chip); 293 tsl2563_wait_adc(chip); 294 295 return 1; 296 } else 297 return 0; 298 } 299 300 static int tsl2563_get_adc(struct tsl2563_chip *chip) 301 { 302 struct i2c_client *client = chip->client; 303 u16 adc0, adc1; 304 int retry = 1; 305 int ret = 0; 306 307 if (chip->suspended) 308 goto out; 309 310 if (!chip->int_enabled) { 311 cancel_delayed_work(&chip->poweroff_work); 312 313 if (!tsl2563_get_power(chip)) { 314 ret = tsl2563_set_power(chip, 1); 315 if (ret) 316 goto out; 317 ret = tsl2563_configure(chip); 318 if (ret) 319 goto out; 320 tsl2563_wait_adc(chip); 321 } 322 } 323 324 while (retry) { 325 ret = i2c_smbus_read_word_data(client, 326 TSL2563_CMD | TSL2563_REG_DATA0LOW); 327 if (ret < 0) 328 goto out; 329 adc0 = ret; 330 331 ret = i2c_smbus_read_word_data(client, 332 TSL2563_CMD | TSL2563_REG_DATA1LOW); 333 if (ret < 0) 334 goto out; 335 adc1 = ret; 336 337 retry = tsl2563_adjust_gainlevel(chip, adc0); 338 } 339 340 chip->data0 = tsl2563_normalize_adc(adc0, chip->gainlevel->gaintime); 341 chip->data1 = tsl2563_normalize_adc(adc1, chip->gainlevel->gaintime); 342 343 if (!chip->int_enabled) 344 schedule_delayed_work(&chip->poweroff_work, 5 * HZ); 345 346 ret = 0; 347 out: 348 return ret; 349 } 350 351 static inline int tsl2563_calib_to_sysfs(u32 calib) 352 { 353 return (int) (((calib * CALIB_BASE_SYSFS) + 354 CALIB_FRAC_HALF) >> CALIB_FRAC_BITS); 355 } 356 357 static inline u32 tsl2563_calib_from_sysfs(int value) 358 { 359 return (((u32) value) << CALIB_FRAC_BITS) / CALIB_BASE_SYSFS; 360 } 361 362 /* 363 * Conversions between lux and ADC values. 364 * 365 * The basic formula is lux = c0 * adc0 - c1 * adc1, where c0 and c1 are 366 * appropriate constants. Different constants are needed for different 367 * kinds of light, determined by the ratio adc1/adc0 (basically the ratio 368 * of the intensities in infrared and visible wavelengths). lux_table below 369 * lists the upper threshold of the adc1/adc0 ratio and the corresponding 370 * constants. 371 */ 372 373 struct tsl2563_lux_coeff { 374 unsigned long ch_ratio; 375 unsigned long ch0_coeff; 376 unsigned long ch1_coeff; 377 }; 378 379 static const struct tsl2563_lux_coeff lux_table[] = { 380 { 381 .ch_ratio = FRAC10K(1300), 382 .ch0_coeff = FRAC10K(315), 383 .ch1_coeff = FRAC10K(262), 384 }, { 385 .ch_ratio = FRAC10K(2600), 386 .ch0_coeff = FRAC10K(337), 387 .ch1_coeff = FRAC10K(430), 388 }, { 389 .ch_ratio = FRAC10K(3900), 390 .ch0_coeff = FRAC10K(363), 391 .ch1_coeff = FRAC10K(529), 392 }, { 393 .ch_ratio = FRAC10K(5200), 394 .ch0_coeff = FRAC10K(392), 395 .ch1_coeff = FRAC10K(605), 396 }, { 397 .ch_ratio = FRAC10K(6500), 398 .ch0_coeff = FRAC10K(229), 399 .ch1_coeff = FRAC10K(291), 400 }, { 401 .ch_ratio = FRAC10K(8000), 402 .ch0_coeff = FRAC10K(157), 403 .ch1_coeff = FRAC10K(180), 404 }, { 405 .ch_ratio = FRAC10K(13000), 406 .ch0_coeff = FRAC10K(34), 407 .ch1_coeff = FRAC10K(26), 408 }, { 409 .ch_ratio = ULONG_MAX, 410 .ch0_coeff = 0, 411 .ch1_coeff = 0, 412 }, 413 }; 414 415 /* Convert normalized, scaled ADC values to lux. */ 416 static unsigned int tsl2563_adc_to_lux(u32 adc0, u32 adc1) 417 { 418 const struct tsl2563_lux_coeff *lp = lux_table; 419 unsigned long ratio, lux, ch0 = adc0, ch1 = adc1; 420 421 ratio = ch0 ? ((ch1 << ADC_FRAC_BITS) / ch0) : ULONG_MAX; 422 423 while (lp->ch_ratio < ratio) 424 lp++; 425 426 lux = ch0 * lp->ch0_coeff - ch1 * lp->ch1_coeff; 427 428 return (unsigned int) (lux >> ADC_FRAC_BITS); 429 } 430 431 /* Apply calibration coefficient to ADC count. */ 432 static u32 tsl2563_calib_adc(u32 adc, u32 calib) 433 { 434 unsigned long scaled = adc; 435 436 scaled *= calib; 437 scaled >>= CALIB_FRAC_BITS; 438 439 return (u32) scaled; 440 } 441 442 static int tsl2563_write_raw(struct iio_dev *indio_dev, 443 struct iio_chan_spec const *chan, 444 int val, 445 int val2, 446 long mask) 447 { 448 struct tsl2563_chip *chip = iio_priv(indio_dev); 449 450 if (mask != IIO_CHAN_INFO_CALIBSCALE) 451 return -EINVAL; 452 if (chan->channel2 == IIO_MOD_LIGHT_BOTH) 453 chip->calib0 = tsl2563_calib_from_sysfs(val); 454 else if (chan->channel2 == IIO_MOD_LIGHT_IR) 455 chip->calib1 = tsl2563_calib_from_sysfs(val); 456 else 457 return -EINVAL; 458 459 return 0; 460 } 461 462 static int tsl2563_read_raw(struct iio_dev *indio_dev, 463 struct iio_chan_spec const *chan, 464 int *val, 465 int *val2, 466 long mask) 467 { 468 int ret = -EINVAL; 469 u32 calib0, calib1; 470 struct tsl2563_chip *chip = iio_priv(indio_dev); 471 472 mutex_lock(&chip->lock); 473 switch (mask) { 474 case IIO_CHAN_INFO_RAW: 475 case IIO_CHAN_INFO_PROCESSED: 476 switch (chan->type) { 477 case IIO_LIGHT: 478 ret = tsl2563_get_adc(chip); 479 if (ret) 480 goto error_ret; 481 calib0 = tsl2563_calib_adc(chip->data0, chip->calib0) * 482 chip->cover_comp_gain; 483 calib1 = tsl2563_calib_adc(chip->data1, chip->calib1) * 484 chip->cover_comp_gain; 485 *val = tsl2563_adc_to_lux(calib0, calib1); 486 ret = IIO_VAL_INT; 487 break; 488 case IIO_INTENSITY: 489 ret = tsl2563_get_adc(chip); 490 if (ret) 491 goto error_ret; 492 if (chan->channel2 == IIO_MOD_LIGHT_BOTH) 493 *val = chip->data0; 494 else 495 *val = chip->data1; 496 ret = IIO_VAL_INT; 497 break; 498 default: 499 break; 500 } 501 break; 502 503 case IIO_CHAN_INFO_CALIBSCALE: 504 if (chan->channel2 == IIO_MOD_LIGHT_BOTH) 505 *val = tsl2563_calib_to_sysfs(chip->calib0); 506 else 507 *val = tsl2563_calib_to_sysfs(chip->calib1); 508 ret = IIO_VAL_INT; 509 break; 510 default: 511 ret = -EINVAL; 512 goto error_ret; 513 } 514 515 error_ret: 516 mutex_unlock(&chip->lock); 517 return ret; 518 } 519 520 static const struct iio_event_spec tsl2563_events[] = { 521 { 522 .type = IIO_EV_TYPE_THRESH, 523 .dir = IIO_EV_DIR_RISING, 524 .mask_separate = BIT(IIO_EV_INFO_VALUE) | 525 BIT(IIO_EV_INFO_ENABLE), 526 }, { 527 .type = IIO_EV_TYPE_THRESH, 528 .dir = IIO_EV_DIR_FALLING, 529 .mask_separate = BIT(IIO_EV_INFO_VALUE) | 530 BIT(IIO_EV_INFO_ENABLE), 531 }, 532 }; 533 534 static const struct iio_chan_spec tsl2563_channels[] = { 535 { 536 .type = IIO_LIGHT, 537 .indexed = 1, 538 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), 539 .channel = 0, 540 }, { 541 .type = IIO_INTENSITY, 542 .modified = 1, 543 .channel2 = IIO_MOD_LIGHT_BOTH, 544 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 545 BIT(IIO_CHAN_INFO_CALIBSCALE), 546 .event_spec = tsl2563_events, 547 .num_event_specs = ARRAY_SIZE(tsl2563_events), 548 }, { 549 .type = IIO_INTENSITY, 550 .modified = 1, 551 .channel2 = IIO_MOD_LIGHT_IR, 552 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 553 BIT(IIO_CHAN_INFO_CALIBSCALE), 554 } 555 }; 556 557 static int tsl2563_read_thresh(struct iio_dev *indio_dev, 558 const struct iio_chan_spec *chan, enum iio_event_type type, 559 enum iio_event_direction dir, enum iio_event_info info, int *val, 560 int *val2) 561 { 562 struct tsl2563_chip *chip = iio_priv(indio_dev); 563 564 switch (dir) { 565 case IIO_EV_DIR_RISING: 566 *val = chip->high_thres; 567 break; 568 case IIO_EV_DIR_FALLING: 569 *val = chip->low_thres; 570 break; 571 default: 572 return -EINVAL; 573 } 574 575 return IIO_VAL_INT; 576 } 577 578 static int tsl2563_write_thresh(struct iio_dev *indio_dev, 579 const struct iio_chan_spec *chan, enum iio_event_type type, 580 enum iio_event_direction dir, enum iio_event_info info, int val, 581 int val2) 582 { 583 struct tsl2563_chip *chip = iio_priv(indio_dev); 584 int ret; 585 u8 address; 586 587 if (dir == IIO_EV_DIR_RISING) 588 address = TSL2563_REG_HIGHLOW; 589 else 590 address = TSL2563_REG_LOWLOW; 591 mutex_lock(&chip->lock); 592 ret = i2c_smbus_write_byte_data(chip->client, TSL2563_CMD | address, 593 val & 0xFF); 594 if (ret) 595 goto error_ret; 596 ret = i2c_smbus_write_byte_data(chip->client, 597 TSL2563_CMD | (address + 1), 598 (val >> 8) & 0xFF); 599 if (dir == IIO_EV_DIR_RISING) 600 chip->high_thres = val; 601 else 602 chip->low_thres = val; 603 604 error_ret: 605 mutex_unlock(&chip->lock); 606 607 return ret; 608 } 609 610 static irqreturn_t tsl2563_event_handler(int irq, void *private) 611 { 612 struct iio_dev *dev_info = private; 613 struct tsl2563_chip *chip = iio_priv(dev_info); 614 615 iio_push_event(dev_info, 616 IIO_UNMOD_EVENT_CODE(IIO_INTENSITY, 617 0, 618 IIO_EV_TYPE_THRESH, 619 IIO_EV_DIR_EITHER), 620 iio_get_time_ns(dev_info)); 621 622 /* clear the interrupt and push the event */ 623 i2c_smbus_write_byte(chip->client, TSL2563_CMD | TSL2563_CLEARINT); 624 return IRQ_HANDLED; 625 } 626 627 static int tsl2563_write_interrupt_config(struct iio_dev *indio_dev, 628 const struct iio_chan_spec *chan, enum iio_event_type type, 629 enum iio_event_direction dir, int state) 630 { 631 struct tsl2563_chip *chip = iio_priv(indio_dev); 632 int ret = 0; 633 634 mutex_lock(&chip->lock); 635 if (state && !(chip->intr & 0x30)) { 636 chip->intr &= ~0x30; 637 chip->intr |= 0x10; 638 /* ensure the chip is actually on */ 639 cancel_delayed_work(&chip->poweroff_work); 640 if (!tsl2563_get_power(chip)) { 641 ret = tsl2563_set_power(chip, 1); 642 if (ret) 643 goto out; 644 ret = tsl2563_configure(chip); 645 if (ret) 646 goto out; 647 } 648 ret = i2c_smbus_write_byte_data(chip->client, 649 TSL2563_CMD | TSL2563_REG_INT, 650 chip->intr); 651 chip->int_enabled = true; 652 } 653 654 if (!state && (chip->intr & 0x30)) { 655 chip->intr &= ~0x30; 656 ret = i2c_smbus_write_byte_data(chip->client, 657 TSL2563_CMD | TSL2563_REG_INT, 658 chip->intr); 659 chip->int_enabled = false; 660 /* now the interrupt is not enabled, we can go to sleep */ 661 schedule_delayed_work(&chip->poweroff_work, 5 * HZ); 662 } 663 out: 664 mutex_unlock(&chip->lock); 665 666 return ret; 667 } 668 669 static int tsl2563_read_interrupt_config(struct iio_dev *indio_dev, 670 const struct iio_chan_spec *chan, enum iio_event_type type, 671 enum iio_event_direction dir) 672 { 673 struct tsl2563_chip *chip = iio_priv(indio_dev); 674 int ret; 675 676 mutex_lock(&chip->lock); 677 ret = i2c_smbus_read_byte_data(chip->client, 678 TSL2563_CMD | TSL2563_REG_INT); 679 mutex_unlock(&chip->lock); 680 if (ret < 0) 681 return ret; 682 683 return !!(ret & 0x30); 684 } 685 686 static const struct iio_info tsl2563_info_no_irq = { 687 .read_raw = &tsl2563_read_raw, 688 .write_raw = &tsl2563_write_raw, 689 }; 690 691 static const struct iio_info tsl2563_info = { 692 .read_raw = &tsl2563_read_raw, 693 .write_raw = &tsl2563_write_raw, 694 .read_event_value = &tsl2563_read_thresh, 695 .write_event_value = &tsl2563_write_thresh, 696 .read_event_config = &tsl2563_read_interrupt_config, 697 .write_event_config = &tsl2563_write_interrupt_config, 698 }; 699 700 static int tsl2563_probe(struct i2c_client *client, 701 const struct i2c_device_id *device_id) 702 { 703 struct iio_dev *indio_dev; 704 struct tsl2563_chip *chip; 705 struct tsl2563_platform_data *pdata = client->dev.platform_data; 706 struct device_node *np = client->dev.of_node; 707 int err = 0; 708 u8 id = 0; 709 710 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip)); 711 if (!indio_dev) 712 return -ENOMEM; 713 714 chip = iio_priv(indio_dev); 715 716 i2c_set_clientdata(client, chip); 717 chip->client = client; 718 719 err = tsl2563_detect(chip); 720 if (err) { 721 dev_err(&client->dev, "detect error %d\n", -err); 722 return err; 723 } 724 725 err = tsl2563_read_id(chip, &id); 726 if (err) { 727 dev_err(&client->dev, "read id error %d\n", -err); 728 return err; 729 } 730 731 mutex_init(&chip->lock); 732 733 /* Default values used until userspace says otherwise */ 734 chip->low_thres = 0x0; 735 chip->high_thres = 0xffff; 736 chip->gainlevel = tsl2563_gainlevel_table; 737 chip->intr = TSL2563_INT_PERSIST(4); 738 chip->calib0 = tsl2563_calib_from_sysfs(CALIB_BASE_SYSFS); 739 chip->calib1 = tsl2563_calib_from_sysfs(CALIB_BASE_SYSFS); 740 741 if (pdata) 742 chip->cover_comp_gain = pdata->cover_comp_gain; 743 else if (np) 744 of_property_read_u32(np, "amstaos,cover-comp-gain", 745 &chip->cover_comp_gain); 746 else 747 chip->cover_comp_gain = 1; 748 749 dev_info(&client->dev, "model %d, rev. %d\n", id >> 4, id & 0x0f); 750 indio_dev->name = client->name; 751 indio_dev->channels = tsl2563_channels; 752 indio_dev->num_channels = ARRAY_SIZE(tsl2563_channels); 753 indio_dev->dev.parent = &client->dev; 754 indio_dev->modes = INDIO_DIRECT_MODE; 755 756 if (client->irq) 757 indio_dev->info = &tsl2563_info; 758 else 759 indio_dev->info = &tsl2563_info_no_irq; 760 761 if (client->irq) { 762 err = devm_request_threaded_irq(&client->dev, client->irq, 763 NULL, 764 &tsl2563_event_handler, 765 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 766 "tsl2563_event", 767 indio_dev); 768 if (err) { 769 dev_err(&client->dev, "irq request error %d\n", -err); 770 return err; 771 } 772 } 773 774 err = tsl2563_configure(chip); 775 if (err) { 776 dev_err(&client->dev, "configure error %d\n", -err); 777 return err; 778 } 779 780 INIT_DELAYED_WORK(&chip->poweroff_work, tsl2563_poweroff_work); 781 782 /* The interrupt cannot yet be enabled so this is fine without lock */ 783 schedule_delayed_work(&chip->poweroff_work, 5 * HZ); 784 785 err = iio_device_register(indio_dev); 786 if (err) { 787 dev_err(&client->dev, "iio registration error %d\n", -err); 788 goto fail; 789 } 790 791 return 0; 792 793 fail: 794 cancel_delayed_work_sync(&chip->poweroff_work); 795 return err; 796 } 797 798 static int tsl2563_remove(struct i2c_client *client) 799 { 800 struct tsl2563_chip *chip = i2c_get_clientdata(client); 801 struct iio_dev *indio_dev = iio_priv_to_dev(chip); 802 803 iio_device_unregister(indio_dev); 804 if (!chip->int_enabled) 805 cancel_delayed_work(&chip->poweroff_work); 806 /* Ensure that interrupts are disabled - then flush any bottom halves */ 807 chip->intr &= ~0x30; 808 i2c_smbus_write_byte_data(chip->client, TSL2563_CMD | TSL2563_REG_INT, 809 chip->intr); 810 flush_scheduled_work(); 811 tsl2563_set_power(chip, 0); 812 813 return 0; 814 } 815 816 #ifdef CONFIG_PM_SLEEP 817 static int tsl2563_suspend(struct device *dev) 818 { 819 struct tsl2563_chip *chip = i2c_get_clientdata(to_i2c_client(dev)); 820 int ret; 821 822 mutex_lock(&chip->lock); 823 824 ret = tsl2563_set_power(chip, 0); 825 if (ret) 826 goto out; 827 828 chip->suspended = true; 829 830 out: 831 mutex_unlock(&chip->lock); 832 return ret; 833 } 834 835 static int tsl2563_resume(struct device *dev) 836 { 837 struct tsl2563_chip *chip = i2c_get_clientdata(to_i2c_client(dev)); 838 int ret; 839 840 mutex_lock(&chip->lock); 841 842 ret = tsl2563_set_power(chip, 1); 843 if (ret) 844 goto out; 845 846 ret = tsl2563_configure(chip); 847 if (ret) 848 goto out; 849 850 chip->suspended = false; 851 852 out: 853 mutex_unlock(&chip->lock); 854 return ret; 855 } 856 857 static SIMPLE_DEV_PM_OPS(tsl2563_pm_ops, tsl2563_suspend, tsl2563_resume); 858 #define TSL2563_PM_OPS (&tsl2563_pm_ops) 859 #else 860 #define TSL2563_PM_OPS NULL 861 #endif 862 863 static const struct i2c_device_id tsl2563_id[] = { 864 { "tsl2560", 0 }, 865 { "tsl2561", 1 }, 866 { "tsl2562", 2 }, 867 { "tsl2563", 3 }, 868 {} 869 }; 870 MODULE_DEVICE_TABLE(i2c, tsl2563_id); 871 872 static const struct of_device_id tsl2563_of_match[] = { 873 { .compatible = "amstaos,tsl2560" }, 874 { .compatible = "amstaos,tsl2561" }, 875 { .compatible = "amstaos,tsl2562" }, 876 { .compatible = "amstaos,tsl2563" }, 877 {} 878 }; 879 MODULE_DEVICE_TABLE(of, tsl2563_of_match); 880 881 static struct i2c_driver tsl2563_i2c_driver = { 882 .driver = { 883 .name = "tsl2563", 884 .of_match_table = tsl2563_of_match, 885 .pm = TSL2563_PM_OPS, 886 }, 887 .probe = tsl2563_probe, 888 .remove = tsl2563_remove, 889 .id_table = tsl2563_id, 890 }; 891 module_i2c_driver(tsl2563_i2c_driver); 892 893 MODULE_AUTHOR("Nokia Corporation"); 894 MODULE_DESCRIPTION("tsl2563 light sensor driver"); 895 MODULE_LICENSE("GPL"); 896