2 * A iio driver for the light sensor ISL 29018.
4 * IIO driver for monitoring ambient light intensity in luxi, proximity
5 * sensing and infrared sensing.
7 * Copyright (c) 2010, NVIDIA Corporation.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful, but WITHOUT
15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
24 #include <linux/module.h>
25 #include <linux/i2c.h>
26 #include <linux/err.h>
27 #include <linux/mutex.h>
28 #include <linux/delay.h>
29 #include <linux/regmap.h>
30 #include <linux/slab.h>
31 #include <linux/iio/iio.h>
32 #include <linux/iio/sysfs.h>
34 #define CONVERSION_TIME_MS 100
36 #define ISL29018_REG_ADD_COMMAND1 0x00
37 #define COMMMAND1_OPMODE_SHIFT 5
38 #define COMMMAND1_OPMODE_MASK (7 << COMMMAND1_OPMODE_SHIFT)
39 #define COMMMAND1_OPMODE_POWER_DOWN 0
40 #define COMMMAND1_OPMODE_ALS_ONCE 1
41 #define COMMMAND1_OPMODE_IR_ONCE 2
42 #define COMMMAND1_OPMODE_PROX_ONCE 3
44 #define ISL29018_REG_ADD_COMMANDII 0x01
45 #define COMMANDII_RESOLUTION_SHIFT 2
46 #define COMMANDII_RESOLUTION_MASK (0x3 << COMMANDII_RESOLUTION_SHIFT)
48 #define COMMANDII_RANGE_SHIFT 0
49 #define COMMANDII_RANGE_MASK (0x3 << COMMANDII_RANGE_SHIFT)
51 #define COMMANDII_SCHEME_SHIFT 7
52 #define COMMANDII_SCHEME_MASK (0x1 << COMMANDII_SCHEME_SHIFT)
54 #define ISL29018_REG_ADD_DATA_LSB 0x02
55 #define ISL29018_REG_ADD_DATA_MSB 0x03
57 #define ISL29018_REG_TEST 0x08
58 #define ISL29018_TEST_SHIFT 0
59 #define ISL29018_TEST_MASK (0xFF << ISL29018_TEST_SHIFT)
61 struct isl29018_chip {
63 struct regmap *regmap;
65 unsigned int lux_scale;
71 static int isl29018_set_range(struct isl29018_chip *chip, unsigned long range,
72 unsigned int *new_range)
74 static const unsigned long supp_ranges[] = {1000, 4000, 16000, 64000};
77 for (i = 0; i < ARRAY_SIZE(supp_ranges); ++i) {
78 if (range <= supp_ranges[i]) {
79 *new_range = (unsigned int)supp_ranges[i];
84 if (i >= ARRAY_SIZE(supp_ranges))
87 return regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMANDII,
88 COMMANDII_RANGE_MASK, i << COMMANDII_RANGE_SHIFT);
91 static int isl29018_set_resolution(struct isl29018_chip *chip,
92 unsigned long adcbit, unsigned int *conf_adc_bit)
94 static const unsigned long supp_adcbit[] = {16, 12, 8, 4};
97 for (i = 0; i < ARRAY_SIZE(supp_adcbit); ++i) {
98 if (adcbit >= supp_adcbit[i]) {
99 *conf_adc_bit = (unsigned int)supp_adcbit[i];
104 if (i >= ARRAY_SIZE(supp_adcbit))
107 return regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMANDII,
108 COMMANDII_RESOLUTION_MASK,
109 i << COMMANDII_RESOLUTION_SHIFT);
112 static int isl29018_read_sensor_input(struct isl29018_chip *chip, int mode)
119 status = regmap_write(chip->regmap, ISL29018_REG_ADD_COMMAND1,
120 mode << COMMMAND1_OPMODE_SHIFT);
123 "Error in setting operating mode err %d\n", status);
126 msleep(CONVERSION_TIME_MS);
127 status = regmap_read(chip->regmap, ISL29018_REG_ADD_DATA_LSB, &lsb);
130 "Error in reading LSB DATA with err %d\n", status);
134 status = regmap_read(chip->regmap, ISL29018_REG_ADD_DATA_MSB, &msb);
137 "Error in reading MSB DATA with error %d\n", status);
140 dev_vdbg(chip->dev, "MSB 0x%x and LSB 0x%x\n", msb, lsb);
142 return (msb << 8) | lsb;
145 static int isl29018_read_lux(struct isl29018_chip *chip, int *lux)
149 lux_data = isl29018_read_sensor_input(chip, COMMMAND1_OPMODE_ALS_ONCE);
154 *lux = (lux_data * chip->range * chip->lux_scale) >> chip->adc_bit;
159 static int isl29018_read_ir(struct isl29018_chip *chip, int *ir)
163 ir_data = isl29018_read_sensor_input(chip, COMMMAND1_OPMODE_IR_ONCE);
173 static int isl29018_read_proximity_ir(struct isl29018_chip *chip, int scheme,
180 /* Do proximity sensing with required scheme */
181 status = regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMANDII,
182 COMMANDII_SCHEME_MASK,
183 scheme << COMMANDII_SCHEME_SHIFT);
185 dev_err(chip->dev, "Error in setting operating mode\n");
189 prox_data = isl29018_read_sensor_input(chip,
190 COMMMAND1_OPMODE_PROX_ONCE);
195 *near_ir = prox_data;
199 ir_data = isl29018_read_sensor_input(chip, COMMMAND1_OPMODE_IR_ONCE);
204 if (prox_data >= ir_data)
205 *near_ir = prox_data - ir_data;
212 /* Sysfs interface */
214 static ssize_t show_range(struct device *dev,
215 struct device_attribute *attr, char *buf)
217 struct iio_dev *indio_dev = dev_get_drvdata(dev);
218 struct isl29018_chip *chip = iio_priv(indio_dev);
220 return sprintf(buf, "%u\n", chip->range);
223 static ssize_t store_range(struct device *dev,
224 struct device_attribute *attr, const char *buf, size_t count)
226 struct iio_dev *indio_dev = dev_get_drvdata(dev);
227 struct isl29018_chip *chip = iio_priv(indio_dev);
230 unsigned int new_range;
232 if (strict_strtoul(buf, 10, &lval))
235 if (!(lval == 1000UL || lval == 4000UL ||
236 lval == 16000UL || lval == 64000UL)) {
237 dev_err(dev, "The range is not supported\n");
241 mutex_lock(&chip->lock);
242 status = isl29018_set_range(chip, lval, &new_range);
244 mutex_unlock(&chip->lock);
246 "Error in setting max range with err %d\n", status);
249 chip->range = new_range;
250 mutex_unlock(&chip->lock);
256 static ssize_t show_resolution(struct device *dev,
257 struct device_attribute *attr, char *buf)
259 struct iio_dev *indio_dev = dev_get_drvdata(dev);
260 struct isl29018_chip *chip = iio_priv(indio_dev);
262 return sprintf(buf, "%u\n", chip->adc_bit);
265 static ssize_t store_resolution(struct device *dev,
266 struct device_attribute *attr, const char *buf, size_t count)
268 struct iio_dev *indio_dev = dev_get_drvdata(dev);
269 struct isl29018_chip *chip = iio_priv(indio_dev);
272 unsigned int new_adc_bit;
274 if (strict_strtoul(buf, 10, &lval))
276 if (!(lval == 4 || lval == 8 || lval == 12 || lval == 16)) {
277 dev_err(dev, "The resolution is not supported\n");
281 mutex_lock(&chip->lock);
282 status = isl29018_set_resolution(chip, lval, &new_adc_bit);
284 mutex_unlock(&chip->lock);
285 dev_err(dev, "Error in setting resolution\n");
288 chip->adc_bit = new_adc_bit;
289 mutex_unlock(&chip->lock);
294 /* proximity scheme */
295 static ssize_t show_prox_infrared_supression(struct device *dev,
296 struct device_attribute *attr, char *buf)
298 struct iio_dev *indio_dev = dev_get_drvdata(dev);
299 struct isl29018_chip *chip = iio_priv(indio_dev);
301 /* return the "proximity scheme" i.e. if the chip does on chip
302 infrared supression (1 means perform on chip supression) */
303 return sprintf(buf, "%d\n", chip->prox_scheme);
306 static ssize_t store_prox_infrared_supression(struct device *dev,
307 struct device_attribute *attr, const char *buf, size_t count)
309 struct iio_dev *indio_dev = dev_get_drvdata(dev);
310 struct isl29018_chip *chip = iio_priv(indio_dev);
313 if (strict_strtoul(buf, 10, &lval))
315 if (!(lval == 0UL || lval == 1UL)) {
316 dev_err(dev, "The mode is not supported\n");
320 /* get the "proximity scheme" i.e. if the chip does on chip
321 infrared supression (1 means perform on chip supression) */
322 mutex_lock(&chip->lock);
323 chip->prox_scheme = (int)lval;
324 mutex_unlock(&chip->lock);
330 static int isl29018_write_raw(struct iio_dev *indio_dev,
331 struct iio_chan_spec const *chan,
336 struct isl29018_chip *chip = iio_priv(indio_dev);
339 mutex_lock(&chip->lock);
340 if (mask == IIO_CHAN_INFO_CALIBSCALE && chan->type == IIO_LIGHT) {
341 chip->lux_scale = val;
344 mutex_unlock(&chip->lock);
349 static int isl29018_read_raw(struct iio_dev *indio_dev,
350 struct iio_chan_spec const *chan,
356 struct isl29018_chip *chip = iio_priv(indio_dev);
358 mutex_lock(&chip->lock);
360 case IIO_CHAN_INFO_RAW:
361 case IIO_CHAN_INFO_PROCESSED:
362 switch (chan->type) {
364 ret = isl29018_read_lux(chip, val);
367 ret = isl29018_read_ir(chip, val);
370 ret = isl29018_read_proximity_ir(chip,
371 chip->prox_scheme, val);
379 case IIO_CHAN_INFO_CALIBSCALE:
380 if (chan->type == IIO_LIGHT) {
381 *val = chip->lux_scale;
388 mutex_unlock(&chip->lock);
392 static const struct iio_chan_spec isl29018_channels[] = {
397 .info_mask = IIO_CHAN_INFO_PROCESSED_SEPARATE_BIT |
398 IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT,
400 .type = IIO_INTENSITY,
402 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
403 .channel2 = IIO_MOD_LIGHT_IR,
405 /* Unindexed in current ABI. But perhaps it should be. */
406 .type = IIO_PROXIMITY,
407 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
411 static IIO_DEVICE_ATTR(range, S_IRUGO | S_IWUSR, show_range, store_range, 0);
412 static IIO_CONST_ATTR(range_available, "1000 4000 16000 64000");
413 static IIO_CONST_ATTR(adc_resolution_available, "4 8 12 16");
414 static IIO_DEVICE_ATTR(adc_resolution, S_IRUGO | S_IWUSR,
415 show_resolution, store_resolution, 0);
416 static IIO_DEVICE_ATTR(proximity_on_chip_ambient_infrared_supression,
418 show_prox_infrared_supression,
419 store_prox_infrared_supression, 0);
421 #define ISL29018_DEV_ATTR(name) (&iio_dev_attr_##name.dev_attr.attr)
422 #define ISL29018_CONST_ATTR(name) (&iio_const_attr_##name.dev_attr.attr)
423 static struct attribute *isl29018_attributes[] = {
424 ISL29018_DEV_ATTR(range),
425 ISL29018_CONST_ATTR(range_available),
426 ISL29018_DEV_ATTR(adc_resolution),
427 ISL29018_CONST_ATTR(adc_resolution_available),
428 ISL29018_DEV_ATTR(proximity_on_chip_ambient_infrared_supression),
432 static const struct attribute_group isl29108_group = {
433 .attrs = isl29018_attributes,
436 static int isl29018_chip_init(struct isl29018_chip *chip)
440 unsigned int new_range;
442 /* Code added per Intersil Application Note 1534:
443 * When VDD sinks to approximately 1.8V or below, some of
444 * the part's registers may change their state. When VDD
445 * recovers to 2.25V (or greater), the part may thus be in an
446 * unknown mode of operation. The user can return the part to
447 * a known mode of operation either by (a) setting VDD = 0V for
448 * 1 second or more and then powering back up with a slew rate
449 * of 0.5V/ms or greater, or (b) via I2C disable all ALS/PROX
450 * conversions, clear the test registers, and then rewrite all
451 * registers to the desired values.
453 * FOR ISL29011, ISL29018, ISL29021, ISL29023
454 * 1. Write 0x00 to register 0x08 (TEST)
455 * 2. Write 0x00 to register 0x00 (CMD1)
456 * 3. Rewrite all registers to the desired values
458 * ISL29018 Data Sheet (FN6619.1, Feb 11, 2010) essentially says
459 * the same thing EXCEPT the data sheet asks for a 1ms delay after
460 * writing the CMD1 register.
462 status = regmap_write(chip->regmap, ISL29018_REG_TEST, 0x0);
464 dev_err(chip->dev, "Failed to clear isl29018 TEST reg."
469 /* See Intersil AN1534 comments above.
470 * "Operating Mode" (COMMAND1) register is reprogrammed when
471 * data is read from the device.
473 status = regmap_write(chip->regmap, ISL29018_REG_ADD_COMMAND1, 0);
475 dev_err(chip->dev, "Failed to clear isl29018 CMD1 reg."
480 msleep(1); /* per data sheet, page 10 */
483 status = isl29018_set_range(chip, chip->range, &new_range);
485 dev_err(chip->dev, "Init of isl29018 fails\n");
489 status = isl29018_set_resolution(chip, chip->adc_bit,
495 static const struct iio_info isl29108_info = {
496 .attrs = &isl29108_group,
497 .driver_module = THIS_MODULE,
498 .read_raw = &isl29018_read_raw,
499 .write_raw = &isl29018_write_raw,
502 static bool is_volatile_reg(struct device *dev, unsigned int reg)
505 case ISL29018_REG_ADD_DATA_LSB:
506 case ISL29018_REG_ADD_DATA_MSB:
507 case ISL29018_REG_ADD_COMMAND1:
508 case ISL29018_REG_TEST:
516 * isl29018_regmap_config: regmap configuration.
517 * Use RBTREE mechanism for caching.
519 static const struct regmap_config isl29018_regmap_config = {
522 .volatile_reg = is_volatile_reg,
523 .max_register = ISL29018_REG_TEST,
524 .num_reg_defaults_raw = ISL29018_REG_TEST + 1,
525 .cache_type = REGCACHE_RBTREE,
528 static int __devinit isl29018_probe(struct i2c_client *client,
529 const struct i2c_device_id *id)
531 struct isl29018_chip *chip;
532 struct iio_dev *indio_dev;
535 indio_dev = iio_allocate_device(sizeof(*chip));
536 if (indio_dev == NULL) {
537 dev_err(&client->dev, "iio allocation fails\n");
541 chip = iio_priv(indio_dev);
543 i2c_set_clientdata(client, indio_dev);
544 chip->dev = &client->dev;
546 mutex_init(&chip->lock);
552 chip->regmap = devm_regmap_init_i2c(client, &isl29018_regmap_config);
553 if (IS_ERR(chip->regmap)) {
554 err = PTR_ERR(chip->regmap);
555 dev_err(chip->dev, "regmap initialization failed: %d\n", err);
559 err = isl29018_chip_init(chip);
563 indio_dev->info = &isl29108_info;
564 indio_dev->channels = isl29018_channels;
565 indio_dev->num_channels = ARRAY_SIZE(isl29018_channels);
566 indio_dev->name = id->name;
567 indio_dev->dev.parent = &client->dev;
568 indio_dev->modes = INDIO_DIRECT_MODE;
569 err = iio_device_register(indio_dev);
571 dev_err(&client->dev, "iio registration fails\n");
577 iio_free_device(indio_dev);
582 static int __devexit isl29018_remove(struct i2c_client *client)
584 struct iio_dev *indio_dev = i2c_get_clientdata(client);
586 dev_dbg(&client->dev, "%s()\n", __func__);
587 iio_device_unregister(indio_dev);
588 iio_free_device(indio_dev);
593 static const struct i2c_device_id isl29018_id[] = {
598 MODULE_DEVICE_TABLE(i2c, isl29018_id);
600 static const struct of_device_id isl29018_of_match[] = {
601 { .compatible = "isil,isl29018", },
604 MODULE_DEVICE_TABLE(of, isl29018_of_match);
606 static struct i2c_driver isl29018_driver = {
607 .class = I2C_CLASS_HWMON,
610 .owner = THIS_MODULE,
611 .of_match_table = isl29018_of_match,
613 .probe = isl29018_probe,
614 .remove = __devexit_p(isl29018_remove),
615 .id_table = isl29018_id,
617 module_i2c_driver(isl29018_driver);
619 MODULE_DESCRIPTION("ISL29018 Ambient Light Sensor driver");
620 MODULE_LICENSE("GPL");