1 /* 2 * drivers/iio/light/tsl2563.c 3 * 4 * Copyright (C) 2008 Nokia Corporation 5 * 6 * Written by Timo O. Karjalainen <timo.o.karjalainen@nokia.com> 7 * Contact: Amit Kucheria <amit.kucheria@verdurent.com> 8 * 9 * Converted to IIO driver 10 * Amit Kucheria <amit.kucheria@verdurent.com> 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License 14 * version 2 as published by the Free Software Foundation. 15 * 16 * This program is distributed in the hope that it will be useful, but 17 * WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 19 * General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 24 * 02110-1301 USA 25 */ 26 27 #include <linux/module.h> 28 #include <linux/i2c.h> 29 #include <linux/interrupt.h> 30 #include <linux/irq.h> 31 #include <linux/sched.h> 32 #include <linux/mutex.h> 33 #include <linux/delay.h> 34 #include <linux/pm.h> 35 #include <linux/err.h> 36 #include <linux/slab.h> 37 38 #include <linux/iio/iio.h> 39 #include <linux/iio/sysfs.h> 40 #include <linux/iio/events.h> 41 #include <linux/platform_data/tsl2563.h> 42 43 /* Use this many bits for fraction part. */ 44 #define ADC_FRAC_BITS 14 45 46 /* Given number of 1/10000's in ADC_FRAC_BITS precision. */ 47 #define FRAC10K(f) (((f) * (1L << (ADC_FRAC_BITS))) / (10000)) 48 49 /* Bits used for fraction in calibration coefficients.*/ 50 #define CALIB_FRAC_BITS 10 51 /* 0.5 in CALIB_FRAC_BITS precision */ 52 #define CALIB_FRAC_HALF (1 << (CALIB_FRAC_BITS - 1)) 53 /* Make a fraction from a number n that was multiplied with b. */ 54 #define CALIB_FRAC(n, b) (((n) << CALIB_FRAC_BITS) / (b)) 55 /* Decimal 10^(digits in sysfs presentation) */ 56 #define CALIB_BASE_SYSFS 1000 57 58 #define TSL2563_CMD 0x80 59 #define TSL2563_CLEARINT 0x40 60 61 #define TSL2563_REG_CTRL 0x00 62 #define TSL2563_REG_TIMING 0x01 63 #define TSL2563_REG_LOWLOW 0x02 /* data0 low threshold, 2 bytes */ 64 #define TSL2563_REG_LOWHIGH 0x03 65 #define TSL2563_REG_HIGHLOW 0x04 /* data0 high threshold, 2 bytes */ 66 #define TSL2563_REG_HIGHHIGH 0x05 67 #define TSL2563_REG_INT 0x06 68 #define TSL2563_REG_ID 0x0a 69 #define TSL2563_REG_DATA0LOW 0x0c /* broadband sensor value, 2 bytes */ 70 #define TSL2563_REG_DATA0HIGH 0x0d 71 #define TSL2563_REG_DATA1LOW 0x0e /* infrared sensor value, 2 bytes */ 72 #define TSL2563_REG_DATA1HIGH 0x0f 73 74 #define TSL2563_CMD_POWER_ON 0x03 75 #define TSL2563_CMD_POWER_OFF 0x00 76 #define TSL2563_CTRL_POWER_MASK 0x03 77 78 #define TSL2563_TIMING_13MS 0x00 79 #define TSL2563_TIMING_100MS 0x01 80 #define TSL2563_TIMING_400MS 0x02 81 #define TSL2563_TIMING_MASK 0x03 82 #define TSL2563_TIMING_GAIN16 0x10 83 #define TSL2563_TIMING_GAIN1 0x00 84 85 #define TSL2563_INT_DISBLED 0x00 86 #define TSL2563_INT_LEVEL 0x10 87 #define TSL2563_INT_PERSIST(n) ((n) & 0x0F) 88 89 struct tsl2563_gainlevel_coeff { 90 u8 gaintime; 91 u16 min; 92 u16 max; 93 }; 94 95 static const struct tsl2563_gainlevel_coeff tsl2563_gainlevel_table[] = { 96 { 97 .gaintime = TSL2563_TIMING_400MS | TSL2563_TIMING_GAIN16, 98 .min = 0, 99 .max = 65534, 100 }, { 101 .gaintime = TSL2563_TIMING_400MS | TSL2563_TIMING_GAIN1, 102 .min = 2048, 103 .max = 65534, 104 }, { 105 .gaintime = TSL2563_TIMING_100MS | TSL2563_TIMING_GAIN1, 106 .min = 4095, 107 .max = 37177, 108 }, { 109 .gaintime = TSL2563_TIMING_13MS | TSL2563_TIMING_GAIN1, 110 .min = 3000, 111 .max = 65535, 112 }, 113 }; 114 115 struct tsl2563_chip { 116 struct mutex lock; 117 struct i2c_client *client; 118 struct delayed_work poweroff_work; 119 120 /* Remember state for suspend and resume functions */ 121 bool suspended; 122 123 struct tsl2563_gainlevel_coeff const *gainlevel; 124 125 u16 low_thres; 126 u16 high_thres; 127 u8 intr; 128 bool int_enabled; 129 130 /* Calibration coefficients */ 131 u32 calib0; 132 u32 calib1; 133 int cover_comp_gain; 134 135 /* Cache current values, to be returned while suspended */ 136 u32 data0; 137 u32 data1; 138 }; 139 140 static int tsl2563_set_power(struct tsl2563_chip *chip, int on) 141 { 142 struct i2c_client *client = chip->client; 143 u8 cmd; 144 145 cmd = on ? TSL2563_CMD_POWER_ON : TSL2563_CMD_POWER_OFF; 146 return i2c_smbus_write_byte_data(client, 147 TSL2563_CMD | TSL2563_REG_CTRL, cmd); 148 } 149 150 /* 151 * Return value is 0 for off, 1 for on, or a negative error 152 * code if reading failed. 153 */ 154 static int tsl2563_get_power(struct tsl2563_chip *chip) 155 { 156 struct i2c_client *client = chip->client; 157 int ret; 158 159 ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_CTRL); 160 if (ret < 0) 161 return ret; 162 163 return (ret & TSL2563_CTRL_POWER_MASK) == TSL2563_CMD_POWER_ON; 164 } 165 166 static int tsl2563_configure(struct tsl2563_chip *chip) 167 { 168 int ret; 169 170 ret = i2c_smbus_write_byte_data(chip->client, 171 TSL2563_CMD | TSL2563_REG_TIMING, 172 chip->gainlevel->gaintime); 173 if (ret) 174 goto error_ret; 175 ret = i2c_smbus_write_byte_data(chip->client, 176 TSL2563_CMD | TSL2563_REG_HIGHLOW, 177 chip->high_thres & 0xFF); 178 if (ret) 179 goto error_ret; 180 ret = i2c_smbus_write_byte_data(chip->client, 181 TSL2563_CMD | TSL2563_REG_HIGHHIGH, 182 (chip->high_thres >> 8) & 0xFF); 183 if (ret) 184 goto error_ret; 185 ret = i2c_smbus_write_byte_data(chip->client, 186 TSL2563_CMD | TSL2563_REG_LOWLOW, 187 chip->low_thres & 0xFF); 188 if (ret) 189 goto error_ret; 190 ret = i2c_smbus_write_byte_data(chip->client, 191 TSL2563_CMD | TSL2563_REG_LOWHIGH, 192 (chip->low_thres >> 8) & 0xFF); 193 /* 194 * Interrupt register is automatically written anyway if it is relevant 195 * so is not here. 196 */ 197 error_ret: 198 return ret; 199 } 200 201 static void tsl2563_poweroff_work(struct work_struct *work) 202 { 203 struct tsl2563_chip *chip = 204 container_of(work, struct tsl2563_chip, poweroff_work.work); 205 tsl2563_set_power(chip, 0); 206 } 207 208 static int tsl2563_detect(struct tsl2563_chip *chip) 209 { 210 int ret; 211 212 ret = tsl2563_set_power(chip, 1); 213 if (ret) 214 return ret; 215 216 ret = tsl2563_get_power(chip); 217 if (ret < 0) 218 return ret; 219 220 return ret ? 0 : -ENODEV; 221 } 222 223 static int tsl2563_read_id(struct tsl2563_chip *chip, u8 *id) 224 { 225 struct i2c_client *client = chip->client; 226 int ret; 227 228 ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_ID); 229 if (ret < 0) 230 return ret; 231 232 *id = ret; 233 234 return 0; 235 } 236 237 /* 238 * "Normalized" ADC value is one obtained with 400ms of integration time and 239 * 16x gain. This function returns the number of bits of shift needed to 240 * convert between normalized values and HW values obtained using given 241 * timing and gain settings. 242 */ 243 static int tsl2563_adc_shiftbits(u8 timing) 244 { 245 int shift = 0; 246 247 switch (timing & TSL2563_TIMING_MASK) { 248 case TSL2563_TIMING_13MS: 249 shift += 5; 250 break; 251 case TSL2563_TIMING_100MS: 252 shift += 2; 253 break; 254 case TSL2563_TIMING_400MS: 255 /* no-op */ 256 break; 257 } 258 259 if (!(timing & TSL2563_TIMING_GAIN16)) 260 shift += 4; 261 262 return shift; 263 } 264 265 /* Convert a HW ADC value to normalized scale. */ 266 static u32 tsl2563_normalize_adc(u16 adc, u8 timing) 267 { 268 return adc << tsl2563_adc_shiftbits(timing); 269 } 270 271 static void tsl2563_wait_adc(struct tsl2563_chip *chip) 272 { 273 unsigned int delay; 274 275 switch (chip->gainlevel->gaintime & TSL2563_TIMING_MASK) { 276 case TSL2563_TIMING_13MS: 277 delay = 14; 278 break; 279 case TSL2563_TIMING_100MS: 280 delay = 101; 281 break; 282 default: 283 delay = 402; 284 } 285 /* 286 * TODO: Make sure that we wait at least required delay but why we 287 * have to extend it one tick more? 288 */ 289 schedule_timeout_interruptible(msecs_to_jiffies(delay) + 2); 290 } 291 292 static int tsl2563_adjust_gainlevel(struct tsl2563_chip *chip, u16 adc) 293 { 294 struct i2c_client *client = chip->client; 295 296 if (adc > chip->gainlevel->max || adc < chip->gainlevel->min) { 297 298 (adc > chip->gainlevel->max) ? 299 chip->gainlevel++ : chip->gainlevel--; 300 301 i2c_smbus_write_byte_data(client, 302 TSL2563_CMD | TSL2563_REG_TIMING, 303 chip->gainlevel->gaintime); 304 305 tsl2563_wait_adc(chip); 306 tsl2563_wait_adc(chip); 307 308 return 1; 309 } else 310 return 0; 311 } 312 313 static int tsl2563_get_adc(struct tsl2563_chip *chip) 314 { 315 struct i2c_client *client = chip->client; 316 u16 adc0, adc1; 317 int retry = 1; 318 int ret = 0; 319 320 if (chip->suspended) 321 goto out; 322 323 if (!chip->int_enabled) { 324 cancel_delayed_work(&chip->poweroff_work); 325 326 if (!tsl2563_get_power(chip)) { 327 ret = tsl2563_set_power(chip, 1); 328 if (ret) 329 goto out; 330 ret = tsl2563_configure(chip); 331 if (ret) 332 goto out; 333 tsl2563_wait_adc(chip); 334 } 335 } 336 337 while (retry) { 338 ret = i2c_smbus_read_word_data(client, 339 TSL2563_CMD | TSL2563_REG_DATA0LOW); 340 if (ret < 0) 341 goto out; 342 adc0 = ret; 343 344 ret = i2c_smbus_read_word_data(client, 345 TSL2563_CMD | TSL2563_REG_DATA1LOW); 346 if (ret < 0) 347 goto out; 348 adc1 = ret; 349 350 retry = tsl2563_adjust_gainlevel(chip, adc0); 351 } 352 353 chip->data0 = tsl2563_normalize_adc(adc0, chip->gainlevel->gaintime); 354 chip->data1 = tsl2563_normalize_adc(adc1, chip->gainlevel->gaintime); 355 356 if (!chip->int_enabled) 357 schedule_delayed_work(&chip->poweroff_work, 5 * HZ); 358 359 ret = 0; 360 out: 361 return ret; 362 } 363 364 static inline int tsl2563_calib_to_sysfs(u32 calib) 365 { 366 return (int) (((calib * CALIB_BASE_SYSFS) + 367 CALIB_FRAC_HALF) >> CALIB_FRAC_BITS); 368 } 369 370 static inline u32 tsl2563_calib_from_sysfs(int value) 371 { 372 return (((u32) value) << CALIB_FRAC_BITS) / CALIB_BASE_SYSFS; 373 } 374 375 /* 376 * Conversions between lux and ADC values. 377 * 378 * The basic formula is lux = c0 * adc0 - c1 * adc1, where c0 and c1 are 379 * appropriate constants. Different constants are needed for different 380 * kinds of light, determined by the ratio adc1/adc0 (basically the ratio 381 * of the intensities in infrared and visible wavelengths). lux_table below 382 * lists the upper threshold of the adc1/adc0 ratio and the corresponding 383 * constants. 384 */ 385 386 struct tsl2563_lux_coeff { 387 unsigned long ch_ratio; 388 unsigned long ch0_coeff; 389 unsigned long ch1_coeff; 390 }; 391 392 static const struct tsl2563_lux_coeff lux_table[] = { 393 { 394 .ch_ratio = FRAC10K(1300), 395 .ch0_coeff = FRAC10K(315), 396 .ch1_coeff = FRAC10K(262), 397 }, { 398 .ch_ratio = FRAC10K(2600), 399 .ch0_coeff = FRAC10K(337), 400 .ch1_coeff = FRAC10K(430), 401 }, { 402 .ch_ratio = FRAC10K(3900), 403 .ch0_coeff = FRAC10K(363), 404 .ch1_coeff = FRAC10K(529), 405 }, { 406 .ch_ratio = FRAC10K(5200), 407 .ch0_coeff = FRAC10K(392), 408 .ch1_coeff = FRAC10K(605), 409 }, { 410 .ch_ratio = FRAC10K(6500), 411 .ch0_coeff = FRAC10K(229), 412 .ch1_coeff = FRAC10K(291), 413 }, { 414 .ch_ratio = FRAC10K(8000), 415 .ch0_coeff = FRAC10K(157), 416 .ch1_coeff = FRAC10K(180), 417 }, { 418 .ch_ratio = FRAC10K(13000), 419 .ch0_coeff = FRAC10K(34), 420 .ch1_coeff = FRAC10K(26), 421 }, { 422 .ch_ratio = ULONG_MAX, 423 .ch0_coeff = 0, 424 .ch1_coeff = 0, 425 }, 426 }; 427 428 /* Convert normalized, scaled ADC values to lux. */ 429 static unsigned int tsl2563_adc_to_lux(u32 adc0, u32 adc1) 430 { 431 const struct tsl2563_lux_coeff *lp = lux_table; 432 unsigned long ratio, lux, ch0 = adc0, ch1 = adc1; 433 434 ratio = ch0 ? ((ch1 << ADC_FRAC_BITS) / ch0) : ULONG_MAX; 435 436 while (lp->ch_ratio < ratio) 437 lp++; 438 439 lux = ch0 * lp->ch0_coeff - ch1 * lp->ch1_coeff; 440 441 return (unsigned int) (lux >> ADC_FRAC_BITS); 442 } 443 444 /* Apply calibration coefficient to ADC count. */ 445 static u32 tsl2563_calib_adc(u32 adc, u32 calib) 446 { 447 unsigned long scaled = adc; 448 449 scaled *= calib; 450 scaled >>= CALIB_FRAC_BITS; 451 452 return (u32) scaled; 453 } 454 455 static int tsl2563_write_raw(struct iio_dev *indio_dev, 456 struct iio_chan_spec const *chan, 457 int val, 458 int val2, 459 long mask) 460 { 461 struct tsl2563_chip *chip = iio_priv(indio_dev); 462 463 if (mask != IIO_CHAN_INFO_CALIBSCALE) 464 return -EINVAL; 465 if (chan->channel2 == IIO_MOD_LIGHT_BOTH) 466 chip->calib0 = tsl2563_calib_from_sysfs(val); 467 else if (chan->channel2 == IIO_MOD_LIGHT_IR) 468 chip->calib1 = tsl2563_calib_from_sysfs(val); 469 else 470 return -EINVAL; 471 472 return 0; 473 } 474 475 static int tsl2563_read_raw(struct iio_dev *indio_dev, 476 struct iio_chan_spec const *chan, 477 int *val, 478 int *val2, 479 long mask) 480 { 481 int ret = -EINVAL; 482 u32 calib0, calib1; 483 struct tsl2563_chip *chip = iio_priv(indio_dev); 484 485 mutex_lock(&chip->lock); 486 switch (mask) { 487 case IIO_CHAN_INFO_RAW: 488 case IIO_CHAN_INFO_PROCESSED: 489 switch (chan->type) { 490 case IIO_LIGHT: 491 ret = tsl2563_get_adc(chip); 492 if (ret) 493 goto error_ret; 494 calib0 = tsl2563_calib_adc(chip->data0, chip->calib0) * 495 chip->cover_comp_gain; 496 calib1 = tsl2563_calib_adc(chip->data1, chip->calib1) * 497 chip->cover_comp_gain; 498 *val = tsl2563_adc_to_lux(calib0, calib1); 499 ret = IIO_VAL_INT; 500 break; 501 case IIO_INTENSITY: 502 ret = tsl2563_get_adc(chip); 503 if (ret) 504 goto error_ret; 505 if (chan->channel2 == IIO_MOD_LIGHT_BOTH) 506 *val = chip->data0; 507 else 508 *val = chip->data1; 509 ret = IIO_VAL_INT; 510 break; 511 default: 512 break; 513 } 514 break; 515 516 case IIO_CHAN_INFO_CALIBSCALE: 517 if (chan->channel2 == IIO_MOD_LIGHT_BOTH) 518 *val = tsl2563_calib_to_sysfs(chip->calib0); 519 else 520 *val = tsl2563_calib_to_sysfs(chip->calib1); 521 ret = IIO_VAL_INT; 522 break; 523 default: 524 ret = -EINVAL; 525 goto error_ret; 526 } 527 528 error_ret: 529 mutex_unlock(&chip->lock); 530 return ret; 531 } 532 533 static const struct iio_event_spec tsl2563_events[] = { 534 { 535 .type = IIO_EV_TYPE_THRESH, 536 .dir = IIO_EV_DIR_RISING, 537 .mask_separate = BIT(IIO_EV_INFO_VALUE) | 538 BIT(IIO_EV_INFO_ENABLE), 539 }, { 540 .type = IIO_EV_TYPE_THRESH, 541 .dir = IIO_EV_DIR_FALLING, 542 .mask_separate = BIT(IIO_EV_INFO_VALUE) | 543 BIT(IIO_EV_INFO_ENABLE), 544 }, 545 }; 546 547 static const struct iio_chan_spec tsl2563_channels[] = { 548 { 549 .type = IIO_LIGHT, 550 .indexed = 1, 551 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), 552 .channel = 0, 553 }, { 554 .type = IIO_INTENSITY, 555 .modified = 1, 556 .channel2 = IIO_MOD_LIGHT_BOTH, 557 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 558 BIT(IIO_CHAN_INFO_CALIBSCALE), 559 .event_spec = tsl2563_events, 560 .num_event_specs = ARRAY_SIZE(tsl2563_events), 561 }, { 562 .type = IIO_INTENSITY, 563 .modified = 1, 564 .channel2 = IIO_MOD_LIGHT_IR, 565 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 566 BIT(IIO_CHAN_INFO_CALIBSCALE), 567 } 568 }; 569 570 static int tsl2563_read_thresh(struct iio_dev *indio_dev, 571 const struct iio_chan_spec *chan, enum iio_event_type type, 572 enum iio_event_direction dir, enum iio_event_info info, int *val, 573 int *val2) 574 { 575 struct tsl2563_chip *chip = iio_priv(indio_dev); 576 577 switch (dir) { 578 case IIO_EV_DIR_RISING: 579 *val = chip->high_thres; 580 break; 581 case IIO_EV_DIR_FALLING: 582 *val = chip->low_thres; 583 break; 584 default: 585 return -EINVAL; 586 } 587 588 return IIO_VAL_INT; 589 } 590 591 static int tsl2563_write_thresh(struct iio_dev *indio_dev, 592 const struct iio_chan_spec *chan, enum iio_event_type type, 593 enum iio_event_direction dir, enum iio_event_info info, int val, 594 int val2) 595 { 596 struct tsl2563_chip *chip = iio_priv(indio_dev); 597 int ret; 598 u8 address; 599 600 if (dir == IIO_EV_DIR_RISING) 601 address = TSL2563_REG_HIGHLOW; 602 else 603 address = TSL2563_REG_LOWLOW; 604 mutex_lock(&chip->lock); 605 ret = i2c_smbus_write_byte_data(chip->client, TSL2563_CMD | address, 606 val & 0xFF); 607 if (ret) 608 goto error_ret; 609 ret = i2c_smbus_write_byte_data(chip->client, 610 TSL2563_CMD | (address + 1), 611 (val >> 8) & 0xFF); 612 if (dir == IIO_EV_DIR_RISING) 613 chip->high_thres = val; 614 else 615 chip->low_thres = val; 616 617 error_ret: 618 mutex_unlock(&chip->lock); 619 620 return ret; 621 } 622 623 static irqreturn_t tsl2563_event_handler(int irq, void *private) 624 { 625 struct iio_dev *dev_info = private; 626 struct tsl2563_chip *chip = iio_priv(dev_info); 627 628 iio_push_event(dev_info, 629 IIO_UNMOD_EVENT_CODE(IIO_INTENSITY, 630 0, 631 IIO_EV_TYPE_THRESH, 632 IIO_EV_DIR_EITHER), 633 iio_get_time_ns(dev_info)); 634 635 /* clear the interrupt and push the event */ 636 i2c_smbus_write_byte(chip->client, TSL2563_CMD | TSL2563_CLEARINT); 637 return IRQ_HANDLED; 638 } 639 640 static int tsl2563_write_interrupt_config(struct iio_dev *indio_dev, 641 const struct iio_chan_spec *chan, enum iio_event_type type, 642 enum iio_event_direction dir, int state) 643 { 644 struct tsl2563_chip *chip = iio_priv(indio_dev); 645 int ret = 0; 646 647 mutex_lock(&chip->lock); 648 if (state && !(chip->intr & 0x30)) { 649 chip->intr &= ~0x30; 650 chip->intr |= 0x10; 651 /* ensure the chip is actually on */ 652 cancel_delayed_work(&chip->poweroff_work); 653 if (!tsl2563_get_power(chip)) { 654 ret = tsl2563_set_power(chip, 1); 655 if (ret) 656 goto out; 657 ret = tsl2563_configure(chip); 658 if (ret) 659 goto out; 660 } 661 ret = i2c_smbus_write_byte_data(chip->client, 662 TSL2563_CMD | TSL2563_REG_INT, 663 chip->intr); 664 chip->int_enabled = true; 665 } 666 667 if (!state && (chip->intr & 0x30)) { 668 chip->intr &= ~0x30; 669 ret = i2c_smbus_write_byte_data(chip->client, 670 TSL2563_CMD | TSL2563_REG_INT, 671 chip->intr); 672 chip->int_enabled = false; 673 /* now the interrupt is not enabled, we can go to sleep */ 674 schedule_delayed_work(&chip->poweroff_work, 5 * HZ); 675 } 676 out: 677 mutex_unlock(&chip->lock); 678 679 return ret; 680 } 681 682 static int tsl2563_read_interrupt_config(struct iio_dev *indio_dev, 683 const struct iio_chan_spec *chan, enum iio_event_type type, 684 enum iio_event_direction dir) 685 { 686 struct tsl2563_chip *chip = iio_priv(indio_dev); 687 int ret; 688 689 mutex_lock(&chip->lock); 690 ret = i2c_smbus_read_byte_data(chip->client, 691 TSL2563_CMD | TSL2563_REG_INT); 692 mutex_unlock(&chip->lock); 693 if (ret < 0) 694 return ret; 695 696 return !!(ret & 0x30); 697 } 698 699 static const struct iio_info tsl2563_info_no_irq = { 700 .read_raw = &tsl2563_read_raw, 701 .write_raw = &tsl2563_write_raw, 702 }; 703 704 static const struct iio_info tsl2563_info = { 705 .read_raw = &tsl2563_read_raw, 706 .write_raw = &tsl2563_write_raw, 707 .read_event_value = &tsl2563_read_thresh, 708 .write_event_value = &tsl2563_write_thresh, 709 .read_event_config = &tsl2563_read_interrupt_config, 710 .write_event_config = &tsl2563_write_interrupt_config, 711 }; 712 713 static int tsl2563_probe(struct i2c_client *client, 714 const struct i2c_device_id *device_id) 715 { 716 struct iio_dev *indio_dev; 717 struct tsl2563_chip *chip; 718 struct tsl2563_platform_data *pdata = client->dev.platform_data; 719 struct device_node *np = client->dev.of_node; 720 int err = 0; 721 u8 id = 0; 722 723 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip)); 724 if (!indio_dev) 725 return -ENOMEM; 726 727 chip = iio_priv(indio_dev); 728 729 i2c_set_clientdata(client, chip); 730 chip->client = client; 731 732 err = tsl2563_detect(chip); 733 if (err) { 734 dev_err(&client->dev, "detect error %d\n", -err); 735 return err; 736 } 737 738 err = tsl2563_read_id(chip, &id); 739 if (err) { 740 dev_err(&client->dev, "read id error %d\n", -err); 741 return err; 742 } 743 744 mutex_init(&chip->lock); 745 746 /* Default values used until userspace says otherwise */ 747 chip->low_thres = 0x0; 748 chip->high_thres = 0xffff; 749 chip->gainlevel = tsl2563_gainlevel_table; 750 chip->intr = TSL2563_INT_PERSIST(4); 751 chip->calib0 = tsl2563_calib_from_sysfs(CALIB_BASE_SYSFS); 752 chip->calib1 = tsl2563_calib_from_sysfs(CALIB_BASE_SYSFS); 753 754 if (pdata) 755 chip->cover_comp_gain = pdata->cover_comp_gain; 756 else if (np) 757 of_property_read_u32(np, "amstaos,cover-comp-gain", 758 &chip->cover_comp_gain); 759 else 760 chip->cover_comp_gain = 1; 761 762 dev_info(&client->dev, "model %d, rev. %d\n", id >> 4, id & 0x0f); 763 indio_dev->name = client->name; 764 indio_dev->channels = tsl2563_channels; 765 indio_dev->num_channels = ARRAY_SIZE(tsl2563_channels); 766 indio_dev->dev.parent = &client->dev; 767 indio_dev->modes = INDIO_DIRECT_MODE; 768 769 if (client->irq) 770 indio_dev->info = &tsl2563_info; 771 else 772 indio_dev->info = &tsl2563_info_no_irq; 773 774 if (client->irq) { 775 err = devm_request_threaded_irq(&client->dev, client->irq, 776 NULL, 777 &tsl2563_event_handler, 778 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 779 "tsl2563_event", 780 indio_dev); 781 if (err) { 782 dev_err(&client->dev, "irq request error %d\n", -err); 783 return err; 784 } 785 } 786 787 err = tsl2563_configure(chip); 788 if (err) { 789 dev_err(&client->dev, "configure error %d\n", -err); 790 return err; 791 } 792 793 INIT_DELAYED_WORK(&chip->poweroff_work, tsl2563_poweroff_work); 794 795 /* The interrupt cannot yet be enabled so this is fine without lock */ 796 schedule_delayed_work(&chip->poweroff_work, 5 * HZ); 797 798 err = iio_device_register(indio_dev); 799 if (err) { 800 dev_err(&client->dev, "iio registration error %d\n", -err); 801 goto fail; 802 } 803 804 return 0; 805 806 fail: 807 cancel_delayed_work_sync(&chip->poweroff_work); 808 return err; 809 } 810 811 static int tsl2563_remove(struct i2c_client *client) 812 { 813 struct tsl2563_chip *chip = i2c_get_clientdata(client); 814 struct iio_dev *indio_dev = iio_priv_to_dev(chip); 815 816 iio_device_unregister(indio_dev); 817 if (!chip->int_enabled) 818 cancel_delayed_work(&chip->poweroff_work); 819 /* Ensure that interrupts are disabled - then flush any bottom halves */ 820 chip->intr &= ~0x30; 821 i2c_smbus_write_byte_data(chip->client, TSL2563_CMD | TSL2563_REG_INT, 822 chip->intr); 823 flush_scheduled_work(); 824 tsl2563_set_power(chip, 0); 825 826 return 0; 827 } 828 829 #ifdef CONFIG_PM_SLEEP 830 static int tsl2563_suspend(struct device *dev) 831 { 832 struct tsl2563_chip *chip = i2c_get_clientdata(to_i2c_client(dev)); 833 int ret; 834 835 mutex_lock(&chip->lock); 836 837 ret = tsl2563_set_power(chip, 0); 838 if (ret) 839 goto out; 840 841 chip->suspended = true; 842 843 out: 844 mutex_unlock(&chip->lock); 845 return ret; 846 } 847 848 static int tsl2563_resume(struct device *dev) 849 { 850 struct tsl2563_chip *chip = i2c_get_clientdata(to_i2c_client(dev)); 851 int ret; 852 853 mutex_lock(&chip->lock); 854 855 ret = tsl2563_set_power(chip, 1); 856 if (ret) 857 goto out; 858 859 ret = tsl2563_configure(chip); 860 if (ret) 861 goto out; 862 863 chip->suspended = false; 864 865 out: 866 mutex_unlock(&chip->lock); 867 return ret; 868 } 869 870 static SIMPLE_DEV_PM_OPS(tsl2563_pm_ops, tsl2563_suspend, tsl2563_resume); 871 #define TSL2563_PM_OPS (&tsl2563_pm_ops) 872 #else 873 #define TSL2563_PM_OPS NULL 874 #endif 875 876 static const struct i2c_device_id tsl2563_id[] = { 877 { "tsl2560", 0 }, 878 { "tsl2561", 1 }, 879 { "tsl2562", 2 }, 880 { "tsl2563", 3 }, 881 {} 882 }; 883 MODULE_DEVICE_TABLE(i2c, tsl2563_id); 884 885 static const struct of_device_id tsl2563_of_match[] = { 886 { .compatible = "amstaos,tsl2560" }, 887 { .compatible = "amstaos,tsl2561" }, 888 { .compatible = "amstaos,tsl2562" }, 889 { .compatible = "amstaos,tsl2563" }, 890 {} 891 }; 892 MODULE_DEVICE_TABLE(of, tsl2563_of_match); 893 894 static struct i2c_driver tsl2563_i2c_driver = { 895 .driver = { 896 .name = "tsl2563", 897 .of_match_table = tsl2563_of_match, 898 .pm = TSL2563_PM_OPS, 899 }, 900 .probe = tsl2563_probe, 901 .remove = tsl2563_remove, 902 .id_table = tsl2563_id, 903 }; 904 module_i2c_driver(tsl2563_i2c_driver); 905 906 MODULE_AUTHOR("Nokia Corporation"); 907 MODULE_DESCRIPTION("tsl2563 light sensor driver"); 908 MODULE_LICENSE("GPL"); 909