1 // SPDX-License-Identifier: GPL-2.0-only
3 * drivers/iio/light/tsl2563.c
5 * Copyright (C) 2008 Nokia Corporation
7 * Written by Timo O. Karjalainen <timo.o.karjalainen@nokia.com>
8 * Contact: Amit Kucheria <amit.kucheria@verdurent.com>
10 * Converted to IIO driver
11 * Amit Kucheria <amit.kucheria@verdurent.com>
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>
22 #include <linux/err.h>
23 #include <linux/slab.h>
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>
30 /* Use this many bits for fraction part. */
31 #define ADC_FRAC_BITS 14
33 /* Given number of 1/10000's in ADC_FRAC_BITS precision. */
34 #define FRAC10K(f) (((f) * (1L << (ADC_FRAC_BITS))) / (10000))
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
45 #define TSL2563_CMD 0x80
46 #define TSL2563_CLEARINT 0x40
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
61 #define TSL2563_CMD_POWER_ON 0x03
62 #define TSL2563_CMD_POWER_OFF 0x00
63 #define TSL2563_CTRL_POWER_MASK 0x03
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
72 #define TSL2563_INT_DISABLED 0x00
73 #define TSL2563_INT_LEVEL 0x10
74 #define TSL2563_INT_PERSIST(n) ((n) & 0x0F)
76 struct tsl2563_gainlevel_coeff {
82 static const struct tsl2563_gainlevel_coeff tsl2563_gainlevel_table[] = {
84 .gaintime = TSL2563_TIMING_400MS | TSL2563_TIMING_GAIN16,
88 .gaintime = TSL2563_TIMING_400MS | TSL2563_TIMING_GAIN1,
92 .gaintime = TSL2563_TIMING_100MS | TSL2563_TIMING_GAIN1,
96 .gaintime = TSL2563_TIMING_13MS | TSL2563_TIMING_GAIN1,
102 struct tsl2563_chip {
104 struct i2c_client *client;
105 struct delayed_work poweroff_work;
107 /* Remember state for suspend and resume functions */
110 struct tsl2563_gainlevel_coeff const *gainlevel;
117 /* Calibration coefficients */
122 /* Cache current values, to be returned while suspended */
127 static int tsl2563_set_power(struct tsl2563_chip *chip, int on)
129 struct i2c_client *client = chip->client;
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);
138 * Return value is 0 for off, 1 for on, or a negative error
139 * code if reading failed.
141 static int tsl2563_get_power(struct tsl2563_chip *chip)
143 struct i2c_client *client = chip->client;
146 ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_CTRL);
150 return (ret & TSL2563_CTRL_POWER_MASK) == TSL2563_CMD_POWER_ON;
153 static int tsl2563_configure(struct tsl2563_chip *chip)
157 ret = i2c_smbus_write_byte_data(chip->client,
158 TSL2563_CMD | TSL2563_REG_TIMING,
159 chip->gainlevel->gaintime);
162 ret = i2c_smbus_write_byte_data(chip->client,
163 TSL2563_CMD | TSL2563_REG_HIGHLOW,
164 chip->high_thres & 0xFF);
167 ret = i2c_smbus_write_byte_data(chip->client,
168 TSL2563_CMD | TSL2563_REG_HIGHHIGH,
169 (chip->high_thres >> 8) & 0xFF);
172 ret = i2c_smbus_write_byte_data(chip->client,
173 TSL2563_CMD | TSL2563_REG_LOWLOW,
174 chip->low_thres & 0xFF);
177 ret = i2c_smbus_write_byte_data(chip->client,
178 TSL2563_CMD | TSL2563_REG_LOWHIGH,
179 (chip->low_thres >> 8) & 0xFF);
181 * Interrupt register is automatically written anyway if it is relevant
188 static void tsl2563_poweroff_work(struct work_struct *work)
190 struct tsl2563_chip *chip =
191 container_of(work, struct tsl2563_chip, poweroff_work.work);
192 tsl2563_set_power(chip, 0);
195 static int tsl2563_detect(struct tsl2563_chip *chip)
199 ret = tsl2563_set_power(chip, 1);
203 ret = tsl2563_get_power(chip);
207 return ret ? 0 : -ENODEV;
210 static int tsl2563_read_id(struct tsl2563_chip *chip, u8 *id)
212 struct i2c_client *client = chip->client;
215 ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_ID);
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.
230 static int tsl2563_adc_shiftbits(u8 timing)
234 switch (timing & TSL2563_TIMING_MASK) {
235 case TSL2563_TIMING_13MS:
238 case TSL2563_TIMING_100MS:
241 case TSL2563_TIMING_400MS:
246 if (!(timing & TSL2563_TIMING_GAIN16))
252 /* Convert a HW ADC value to normalized scale. */
253 static u32 tsl2563_normalize_adc(u16 adc, u8 timing)
255 return adc << tsl2563_adc_shiftbits(timing);
258 static void tsl2563_wait_adc(struct tsl2563_chip *chip)
262 switch (chip->gainlevel->gaintime & TSL2563_TIMING_MASK) {
263 case TSL2563_TIMING_13MS:
266 case TSL2563_TIMING_100MS:
273 * TODO: Make sure that we wait at least required delay but why we
274 * have to extend it one tick more?
276 schedule_timeout_interruptible(msecs_to_jiffies(delay) + 2);
279 static int tsl2563_adjust_gainlevel(struct tsl2563_chip *chip, u16 adc)
281 struct i2c_client *client = chip->client;
283 if (adc > chip->gainlevel->max || adc < chip->gainlevel->min) {
285 (adc > chip->gainlevel->max) ?
286 chip->gainlevel++ : chip->gainlevel--;
288 i2c_smbus_write_byte_data(client,
289 TSL2563_CMD | TSL2563_REG_TIMING,
290 chip->gainlevel->gaintime);
292 tsl2563_wait_adc(chip);
293 tsl2563_wait_adc(chip);
300 static int tsl2563_get_adc(struct tsl2563_chip *chip)
302 struct i2c_client *client = chip->client;
310 if (!chip->int_enabled) {
311 cancel_delayed_work(&chip->poweroff_work);
313 if (!tsl2563_get_power(chip)) {
314 ret = tsl2563_set_power(chip, 1);
317 ret = tsl2563_configure(chip);
320 tsl2563_wait_adc(chip);
325 ret = i2c_smbus_read_word_data(client,
326 TSL2563_CMD | TSL2563_REG_DATA0LOW);
331 ret = i2c_smbus_read_word_data(client,
332 TSL2563_CMD | TSL2563_REG_DATA1LOW);
337 retry = tsl2563_adjust_gainlevel(chip, adc0);
340 chip->data0 = tsl2563_normalize_adc(adc0, chip->gainlevel->gaintime);
341 chip->data1 = tsl2563_normalize_adc(adc1, chip->gainlevel->gaintime);
343 if (!chip->int_enabled)
344 schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
351 static inline int tsl2563_calib_to_sysfs(u32 calib)
353 return (int) (((calib * CALIB_BASE_SYSFS) +
354 CALIB_FRAC_HALF) >> CALIB_FRAC_BITS);
357 static inline u32 tsl2563_calib_from_sysfs(int value)
359 return (((u32) value) << CALIB_FRAC_BITS) / CALIB_BASE_SYSFS;
363 * Conversions between lux and ADC values.
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
373 struct tsl2563_lux_coeff {
374 unsigned long ch_ratio;
375 unsigned long ch0_coeff;
376 unsigned long ch1_coeff;
379 static const struct tsl2563_lux_coeff lux_table[] = {
381 .ch_ratio = FRAC10K(1300),
382 .ch0_coeff = FRAC10K(315),
383 .ch1_coeff = FRAC10K(262),
385 .ch_ratio = FRAC10K(2600),
386 .ch0_coeff = FRAC10K(337),
387 .ch1_coeff = FRAC10K(430),
389 .ch_ratio = FRAC10K(3900),
390 .ch0_coeff = FRAC10K(363),
391 .ch1_coeff = FRAC10K(529),
393 .ch_ratio = FRAC10K(5200),
394 .ch0_coeff = FRAC10K(392),
395 .ch1_coeff = FRAC10K(605),
397 .ch_ratio = FRAC10K(6500),
398 .ch0_coeff = FRAC10K(229),
399 .ch1_coeff = FRAC10K(291),
401 .ch_ratio = FRAC10K(8000),
402 .ch0_coeff = FRAC10K(157),
403 .ch1_coeff = FRAC10K(180),
405 .ch_ratio = FRAC10K(13000),
406 .ch0_coeff = FRAC10K(34),
407 .ch1_coeff = FRAC10K(26),
409 .ch_ratio = ULONG_MAX,
415 /* Convert normalized, scaled ADC values to lux. */
416 static unsigned int tsl2563_adc_to_lux(u32 adc0, u32 adc1)
418 const struct tsl2563_lux_coeff *lp = lux_table;
419 unsigned long ratio, lux, ch0 = adc0, ch1 = adc1;
421 ratio = ch0 ? ((ch1 << ADC_FRAC_BITS) / ch0) : ULONG_MAX;
423 while (lp->ch_ratio < ratio)
426 lux = ch0 * lp->ch0_coeff - ch1 * lp->ch1_coeff;
428 return (unsigned int) (lux >> ADC_FRAC_BITS);
431 /* Apply calibration coefficient to ADC count. */
432 static u32 tsl2563_calib_adc(u32 adc, u32 calib)
434 unsigned long scaled = adc;
437 scaled >>= CALIB_FRAC_BITS;
442 static int tsl2563_write_raw(struct iio_dev *indio_dev,
443 struct iio_chan_spec const *chan,
448 struct tsl2563_chip *chip = iio_priv(indio_dev);
450 if (mask != IIO_CHAN_INFO_CALIBSCALE)
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);
462 static int tsl2563_read_raw(struct iio_dev *indio_dev,
463 struct iio_chan_spec const *chan,
470 struct tsl2563_chip *chip = iio_priv(indio_dev);
472 mutex_lock(&chip->lock);
474 case IIO_CHAN_INFO_RAW:
475 case IIO_CHAN_INFO_PROCESSED:
476 switch (chan->type) {
478 ret = tsl2563_get_adc(chip);
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);
489 ret = tsl2563_get_adc(chip);
492 if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
503 case IIO_CHAN_INFO_CALIBSCALE:
504 if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
505 *val = tsl2563_calib_to_sysfs(chip->calib0);
507 *val = tsl2563_calib_to_sysfs(chip->calib1);
516 mutex_unlock(&chip->lock);
520 static const struct iio_event_spec tsl2563_events[] = {
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),
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),
534 static const struct iio_chan_spec tsl2563_channels[] = {
538 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
541 .type = IIO_INTENSITY,
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),
549 .type = IIO_INTENSITY,
551 .channel2 = IIO_MOD_LIGHT_IR,
552 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
553 BIT(IIO_CHAN_INFO_CALIBSCALE),
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,
562 struct tsl2563_chip *chip = iio_priv(indio_dev);
565 case IIO_EV_DIR_RISING:
566 *val = chip->high_thres;
568 case IIO_EV_DIR_FALLING:
569 *val = chip->low_thres;
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,
583 struct tsl2563_chip *chip = iio_priv(indio_dev);
587 if (dir == IIO_EV_DIR_RISING)
588 address = TSL2563_REG_HIGHLOW;
590 address = TSL2563_REG_LOWLOW;
591 mutex_lock(&chip->lock);
592 ret = i2c_smbus_write_byte_data(chip->client, TSL2563_CMD | address,
596 ret = i2c_smbus_write_byte_data(chip->client,
597 TSL2563_CMD | (address + 1),
599 if (dir == IIO_EV_DIR_RISING)
600 chip->high_thres = val;
602 chip->low_thres = val;
605 mutex_unlock(&chip->lock);
610 static irqreturn_t tsl2563_event_handler(int irq, void *private)
612 struct iio_dev *dev_info = private;
613 struct tsl2563_chip *chip = iio_priv(dev_info);
615 iio_push_event(dev_info,
616 IIO_UNMOD_EVENT_CODE(IIO_INTENSITY,
620 iio_get_time_ns(dev_info));
622 /* clear the interrupt and push the event */
623 i2c_smbus_write_byte(chip->client, TSL2563_CMD | TSL2563_CLEARINT);
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)
631 struct tsl2563_chip *chip = iio_priv(indio_dev);
634 mutex_lock(&chip->lock);
635 if (state && !(chip->intr & 0x30)) {
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);
644 ret = tsl2563_configure(chip);
648 ret = i2c_smbus_write_byte_data(chip->client,
649 TSL2563_CMD | TSL2563_REG_INT,
651 chip->int_enabled = true;
654 if (!state && (chip->intr & 0x30)) {
656 ret = i2c_smbus_write_byte_data(chip->client,
657 TSL2563_CMD | TSL2563_REG_INT,
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);
664 mutex_unlock(&chip->lock);
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)
673 struct tsl2563_chip *chip = iio_priv(indio_dev);
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);
683 return !!(ret & 0x30);
686 static const struct iio_info tsl2563_info_no_irq = {
687 .read_raw = &tsl2563_read_raw,
688 .write_raw = &tsl2563_write_raw,
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,
700 static int tsl2563_probe(struct i2c_client *client,
701 const struct i2c_device_id *device_id)
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;
710 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
714 chip = iio_priv(indio_dev);
716 i2c_set_clientdata(client, indio_dev);
717 chip->client = client;
719 err = tsl2563_detect(chip);
721 dev_err(&client->dev, "detect error %d\n", -err);
725 err = tsl2563_read_id(chip, &id);
727 dev_err(&client->dev, "read id error %d\n", -err);
731 mutex_init(&chip->lock);
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);
742 chip->cover_comp_gain = pdata->cover_comp_gain;
744 of_property_read_u32(np, "amstaos,cover-comp-gain",
745 &chip->cover_comp_gain);
747 chip->cover_comp_gain = 1;
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->modes = INDIO_DIRECT_MODE;
756 indio_dev->info = &tsl2563_info;
758 indio_dev->info = &tsl2563_info_no_irq;
761 err = devm_request_threaded_irq(&client->dev, client->irq,
763 &tsl2563_event_handler,
764 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
768 dev_err(&client->dev, "irq request error %d\n", -err);
773 err = tsl2563_configure(chip);
775 dev_err(&client->dev, "configure error %d\n", -err);
779 INIT_DELAYED_WORK(&chip->poweroff_work, tsl2563_poweroff_work);
781 /* The interrupt cannot yet be enabled so this is fine without lock */
782 schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
784 err = iio_device_register(indio_dev);
786 dev_err(&client->dev, "iio registration error %d\n", -err);
793 cancel_delayed_work_sync(&chip->poweroff_work);
797 static int tsl2563_remove(struct i2c_client *client)
799 struct iio_dev *indio_dev = i2c_get_clientdata(client);
800 struct tsl2563_chip *chip = iio_priv(indio_dev);
802 iio_device_unregister(indio_dev);
803 if (!chip->int_enabled)
804 cancel_delayed_work(&chip->poweroff_work);
805 /* Ensure that interrupts are disabled - then flush any bottom halves */
807 i2c_smbus_write_byte_data(chip->client, TSL2563_CMD | TSL2563_REG_INT,
809 flush_scheduled_work();
810 tsl2563_set_power(chip, 0);
815 #ifdef CONFIG_PM_SLEEP
816 static int tsl2563_suspend(struct device *dev)
818 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
819 struct tsl2563_chip *chip = iio_priv(indio_dev);
822 mutex_lock(&chip->lock);
824 ret = tsl2563_set_power(chip, 0);
828 chip->suspended = true;
831 mutex_unlock(&chip->lock);
835 static int tsl2563_resume(struct device *dev)
837 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
838 struct tsl2563_chip *chip = iio_priv(indio_dev);
841 mutex_lock(&chip->lock);
843 ret = tsl2563_set_power(chip, 1);
847 ret = tsl2563_configure(chip);
851 chip->suspended = false;
854 mutex_unlock(&chip->lock);
858 static SIMPLE_DEV_PM_OPS(tsl2563_pm_ops, tsl2563_suspend, tsl2563_resume);
859 #define TSL2563_PM_OPS (&tsl2563_pm_ops)
861 #define TSL2563_PM_OPS NULL
864 static const struct i2c_device_id tsl2563_id[] = {
871 MODULE_DEVICE_TABLE(i2c, tsl2563_id);
873 static const struct of_device_id tsl2563_of_match[] = {
874 { .compatible = "amstaos,tsl2560" },
875 { .compatible = "amstaos,tsl2561" },
876 { .compatible = "amstaos,tsl2562" },
877 { .compatible = "amstaos,tsl2563" },
880 MODULE_DEVICE_TABLE(of, tsl2563_of_match);
882 static struct i2c_driver tsl2563_i2c_driver = {
885 .of_match_table = tsl2563_of_match,
886 .pm = TSL2563_PM_OPS,
888 .probe = tsl2563_probe,
889 .remove = tsl2563_remove,
890 .id_table = tsl2563_id,
892 module_i2c_driver(tsl2563_i2c_driver);
894 MODULE_AUTHOR("Nokia Corporation");
895 MODULE_DESCRIPTION("tsl2563 light sensor driver");
896 MODULE_LICENSE("GPL");