| 1 | /* |
| 2 | * A iio driver for the light sensor ISL 29018. |
| 3 | * |
| 4 | * IIO driver for monitoring ambient light intensity in luxi, proximity |
| 5 | * sensing and infrared sensing. |
| 6 | * |
| 7 | * Copyright (c) 2010, NVIDIA Corporation. |
| 8 | * |
| 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. |
| 13 | * |
| 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 |
| 17 | * more details. |
| 18 | * |
| 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. |
| 22 | */ |
| 23 | |
| 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> |
| 33 | |
| 34 | #define CONVERSION_TIME_MS 100 |
| 35 | |
| 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 |
| 43 | |
| 44 | #define ISL29018_REG_ADD_COMMANDII 0x01 |
| 45 | #define COMMANDII_RESOLUTION_SHIFT 2 |
| 46 | #define COMMANDII_RESOLUTION_MASK (0x3 << COMMANDII_RESOLUTION_SHIFT) |
| 47 | |
| 48 | #define COMMANDII_RANGE_SHIFT 0 |
| 49 | #define COMMANDII_RANGE_MASK (0x3 << COMMANDII_RANGE_SHIFT) |
| 50 | |
| 51 | #define COMMANDII_SCHEME_SHIFT 7 |
| 52 | #define COMMANDII_SCHEME_MASK (0x1 << COMMANDII_SCHEME_SHIFT) |
| 53 | |
| 54 | #define ISL29018_REG_ADD_DATA_LSB 0x02 |
| 55 | #define ISL29018_REG_ADD_DATA_MSB 0x03 |
| 56 | |
| 57 | #define ISL29018_REG_TEST 0x08 |
| 58 | #define ISL29018_TEST_SHIFT 0 |
| 59 | #define ISL29018_TEST_MASK (0xFF << ISL29018_TEST_SHIFT) |
| 60 | |
| 61 | struct isl29018_chip { |
| 62 | struct device *dev; |
| 63 | struct regmap *regmap; |
| 64 | struct mutex lock; |
| 65 | unsigned int lux_scale; |
| 66 | unsigned int lux_uscale; |
| 67 | unsigned int range; |
| 68 | unsigned int adc_bit; |
| 69 | int prox_scheme; |
| 70 | }; |
| 71 | |
| 72 | static int isl29018_set_range(struct isl29018_chip *chip, unsigned long range, |
| 73 | unsigned int *new_range) |
| 74 | { |
| 75 | static const unsigned long supp_ranges[] = {1000, 4000, 16000, 64000}; |
| 76 | int i; |
| 77 | |
| 78 | for (i = 0; i < ARRAY_SIZE(supp_ranges); ++i) { |
| 79 | if (range <= supp_ranges[i]) { |
| 80 | *new_range = (unsigned int)supp_ranges[i]; |
| 81 | break; |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | if (i >= ARRAY_SIZE(supp_ranges)) |
| 86 | return -EINVAL; |
| 87 | |
| 88 | return regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMANDII, |
| 89 | COMMANDII_RANGE_MASK, i << COMMANDII_RANGE_SHIFT); |
| 90 | } |
| 91 | |
| 92 | static int isl29018_set_resolution(struct isl29018_chip *chip, |
| 93 | unsigned long adcbit, unsigned int *conf_adc_bit) |
| 94 | { |
| 95 | static const unsigned long supp_adcbit[] = {16, 12, 8, 4}; |
| 96 | int i; |
| 97 | |
| 98 | for (i = 0; i < ARRAY_SIZE(supp_adcbit); ++i) { |
| 99 | if (adcbit >= supp_adcbit[i]) { |
| 100 | *conf_adc_bit = (unsigned int)supp_adcbit[i]; |
| 101 | break; |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | if (i >= ARRAY_SIZE(supp_adcbit)) |
| 106 | return -EINVAL; |
| 107 | |
| 108 | return regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMANDII, |
| 109 | COMMANDII_RESOLUTION_MASK, |
| 110 | i << COMMANDII_RESOLUTION_SHIFT); |
| 111 | } |
| 112 | |
| 113 | static int isl29018_read_sensor_input(struct isl29018_chip *chip, int mode) |
| 114 | { |
| 115 | int status; |
| 116 | unsigned int lsb; |
| 117 | unsigned int msb; |
| 118 | |
| 119 | /* Set mode */ |
| 120 | status = regmap_write(chip->regmap, ISL29018_REG_ADD_COMMAND1, |
| 121 | mode << COMMMAND1_OPMODE_SHIFT); |
| 122 | if (status) { |
| 123 | dev_err(chip->dev, |
| 124 | "Error in setting operating mode err %d\n", status); |
| 125 | return status; |
| 126 | } |
| 127 | msleep(CONVERSION_TIME_MS); |
| 128 | status = regmap_read(chip->regmap, ISL29018_REG_ADD_DATA_LSB, &lsb); |
| 129 | if (status < 0) { |
| 130 | dev_err(chip->dev, |
| 131 | "Error in reading LSB DATA with err %d\n", status); |
| 132 | return status; |
| 133 | } |
| 134 | |
| 135 | status = regmap_read(chip->regmap, ISL29018_REG_ADD_DATA_MSB, &msb); |
| 136 | if (status < 0) { |
| 137 | dev_err(chip->dev, |
| 138 | "Error in reading MSB DATA with error %d\n", status); |
| 139 | return status; |
| 140 | } |
| 141 | dev_vdbg(chip->dev, "MSB 0x%x and LSB 0x%x\n", msb, lsb); |
| 142 | |
| 143 | return (msb << 8) | lsb; |
| 144 | } |
| 145 | |
| 146 | static int isl29018_read_lux(struct isl29018_chip *chip, int *lux) |
| 147 | { |
| 148 | int lux_data; |
| 149 | unsigned int data_x_range, lux_unshifted; |
| 150 | |
| 151 | lux_data = isl29018_read_sensor_input(chip, COMMMAND1_OPMODE_ALS_ONCE); |
| 152 | |
| 153 | if (lux_data < 0) |
| 154 | return lux_data; |
| 155 | |
| 156 | /* To support fractional scaling, separate the unshifted lux |
| 157 | * into two calculations: int scaling and micro-scaling. |
| 158 | * lux_uscale ranges from 0-999999, so about 20 bits. Split |
| 159 | * the /1,000,000 in two to reduce the risk of over/underflow. |
| 160 | */ |
| 161 | data_x_range = lux_data * chip->range; |
| 162 | lux_unshifted = data_x_range * chip->lux_scale; |
| 163 | lux_unshifted += data_x_range / 1000 * chip->lux_uscale / 1000; |
| 164 | *lux = lux_unshifted >> chip->adc_bit; |
| 165 | |
| 166 | return 0; |
| 167 | } |
| 168 | |
| 169 | static int isl29018_read_ir(struct isl29018_chip *chip, int *ir) |
| 170 | { |
| 171 | int ir_data; |
| 172 | |
| 173 | ir_data = isl29018_read_sensor_input(chip, COMMMAND1_OPMODE_IR_ONCE); |
| 174 | |
| 175 | if (ir_data < 0) |
| 176 | return ir_data; |
| 177 | |
| 178 | *ir = ir_data; |
| 179 | |
| 180 | return 0; |
| 181 | } |
| 182 | |
| 183 | static int isl29018_read_proximity_ir(struct isl29018_chip *chip, int scheme, |
| 184 | int *near_ir) |
| 185 | { |
| 186 | int status; |
| 187 | int prox_data = -1; |
| 188 | int ir_data = -1; |
| 189 | |
| 190 | /* Do proximity sensing with required scheme */ |
| 191 | status = regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMANDII, |
| 192 | COMMANDII_SCHEME_MASK, |
| 193 | scheme << COMMANDII_SCHEME_SHIFT); |
| 194 | if (status) { |
| 195 | dev_err(chip->dev, "Error in setting operating mode\n"); |
| 196 | return status; |
| 197 | } |
| 198 | |
| 199 | prox_data = isl29018_read_sensor_input(chip, |
| 200 | COMMMAND1_OPMODE_PROX_ONCE); |
| 201 | if (prox_data < 0) |
| 202 | return prox_data; |
| 203 | |
| 204 | if (scheme == 1) { |
| 205 | *near_ir = prox_data; |
| 206 | return 0; |
| 207 | } |
| 208 | |
| 209 | ir_data = isl29018_read_sensor_input(chip, COMMMAND1_OPMODE_IR_ONCE); |
| 210 | |
| 211 | if (ir_data < 0) |
| 212 | return ir_data; |
| 213 | |
| 214 | if (prox_data >= ir_data) |
| 215 | *near_ir = prox_data - ir_data; |
| 216 | else |
| 217 | *near_ir = 0; |
| 218 | |
| 219 | return 0; |
| 220 | } |
| 221 | |
| 222 | /* Sysfs interface */ |
| 223 | /* range */ |
| 224 | static ssize_t show_range(struct device *dev, |
| 225 | struct device_attribute *attr, char *buf) |
| 226 | { |
| 227 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
| 228 | struct isl29018_chip *chip = iio_priv(indio_dev); |
| 229 | |
| 230 | return sprintf(buf, "%u\n", chip->range); |
| 231 | } |
| 232 | |
| 233 | static ssize_t store_range(struct device *dev, |
| 234 | struct device_attribute *attr, const char *buf, size_t count) |
| 235 | { |
| 236 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
| 237 | struct isl29018_chip *chip = iio_priv(indio_dev); |
| 238 | int status; |
| 239 | unsigned long lval; |
| 240 | unsigned int new_range; |
| 241 | |
| 242 | if (strict_strtoul(buf, 10, &lval)) |
| 243 | return -EINVAL; |
| 244 | |
| 245 | if (!(lval == 1000UL || lval == 4000UL || |
| 246 | lval == 16000UL || lval == 64000UL)) { |
| 247 | dev_err(dev, "The range is not supported\n"); |
| 248 | return -EINVAL; |
| 249 | } |
| 250 | |
| 251 | mutex_lock(&chip->lock); |
| 252 | status = isl29018_set_range(chip, lval, &new_range); |
| 253 | if (status < 0) { |
| 254 | mutex_unlock(&chip->lock); |
| 255 | dev_err(dev, |
| 256 | "Error in setting max range with err %d\n", status); |
| 257 | return status; |
| 258 | } |
| 259 | chip->range = new_range; |
| 260 | mutex_unlock(&chip->lock); |
| 261 | |
| 262 | return count; |
| 263 | } |
| 264 | |
| 265 | /* resolution */ |
| 266 | static ssize_t show_resolution(struct device *dev, |
| 267 | struct device_attribute *attr, char *buf) |
| 268 | { |
| 269 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
| 270 | struct isl29018_chip *chip = iio_priv(indio_dev); |
| 271 | |
| 272 | return sprintf(buf, "%u\n", chip->adc_bit); |
| 273 | } |
| 274 | |
| 275 | static ssize_t store_resolution(struct device *dev, |
| 276 | struct device_attribute *attr, const char *buf, size_t count) |
| 277 | { |
| 278 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
| 279 | struct isl29018_chip *chip = iio_priv(indio_dev); |
| 280 | int status; |
| 281 | unsigned long lval; |
| 282 | unsigned int new_adc_bit; |
| 283 | |
| 284 | if (strict_strtoul(buf, 10, &lval)) |
| 285 | return -EINVAL; |
| 286 | if (!(lval == 4 || lval == 8 || lval == 12 || lval == 16)) { |
| 287 | dev_err(dev, "The resolution is not supported\n"); |
| 288 | return -EINVAL; |
| 289 | } |
| 290 | |
| 291 | mutex_lock(&chip->lock); |
| 292 | status = isl29018_set_resolution(chip, lval, &new_adc_bit); |
| 293 | if (status < 0) { |
| 294 | mutex_unlock(&chip->lock); |
| 295 | dev_err(dev, "Error in setting resolution\n"); |
| 296 | return status; |
| 297 | } |
| 298 | chip->adc_bit = new_adc_bit; |
| 299 | mutex_unlock(&chip->lock); |
| 300 | |
| 301 | return count; |
| 302 | } |
| 303 | |
| 304 | /* proximity scheme */ |
| 305 | static ssize_t show_prox_infrared_suppression(struct device *dev, |
| 306 | struct device_attribute *attr, char *buf) |
| 307 | { |
| 308 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
| 309 | struct isl29018_chip *chip = iio_priv(indio_dev); |
| 310 | |
| 311 | /* return the "proximity scheme" i.e. if the chip does on chip |
| 312 | infrared suppression (1 means perform on chip suppression) */ |
| 313 | return sprintf(buf, "%d\n", chip->prox_scheme); |
| 314 | } |
| 315 | |
| 316 | static ssize_t store_prox_infrared_suppression(struct device *dev, |
| 317 | struct device_attribute *attr, const char *buf, size_t count) |
| 318 | { |
| 319 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
| 320 | struct isl29018_chip *chip = iio_priv(indio_dev); |
| 321 | unsigned long lval; |
| 322 | |
| 323 | if (strict_strtoul(buf, 10, &lval)) |
| 324 | return -EINVAL; |
| 325 | if (!(lval == 0UL || lval == 1UL)) { |
| 326 | dev_err(dev, "The mode is not supported\n"); |
| 327 | return -EINVAL; |
| 328 | } |
| 329 | |
| 330 | /* get the "proximity scheme" i.e. if the chip does on chip |
| 331 | infrared suppression (1 means perform on chip suppression) */ |
| 332 | mutex_lock(&chip->lock); |
| 333 | chip->prox_scheme = (int)lval; |
| 334 | mutex_unlock(&chip->lock); |
| 335 | |
| 336 | return count; |
| 337 | } |
| 338 | |
| 339 | /* Channel IO */ |
| 340 | static int isl29018_write_raw(struct iio_dev *indio_dev, |
| 341 | struct iio_chan_spec const *chan, |
| 342 | int val, |
| 343 | int val2, |
| 344 | long mask) |
| 345 | { |
| 346 | struct isl29018_chip *chip = iio_priv(indio_dev); |
| 347 | int ret = -EINVAL; |
| 348 | |
| 349 | mutex_lock(&chip->lock); |
| 350 | if (mask == IIO_CHAN_INFO_CALIBSCALE && chan->type == IIO_LIGHT) { |
| 351 | chip->lux_scale = val; |
| 352 | /* With no write_raw_get_fmt(), val2 is a MICRO fraction. */ |
| 353 | chip->lux_uscale = val2; |
| 354 | ret = 0; |
| 355 | } |
| 356 | mutex_unlock(&chip->lock); |
| 357 | |
| 358 | return 0; |
| 359 | } |
| 360 | |
| 361 | static int isl29018_read_raw(struct iio_dev *indio_dev, |
| 362 | struct iio_chan_spec const *chan, |
| 363 | int *val, |
| 364 | int *val2, |
| 365 | long mask) |
| 366 | { |
| 367 | int ret = -EINVAL; |
| 368 | struct isl29018_chip *chip = iio_priv(indio_dev); |
| 369 | |
| 370 | mutex_lock(&chip->lock); |
| 371 | switch (mask) { |
| 372 | case IIO_CHAN_INFO_RAW: |
| 373 | case IIO_CHAN_INFO_PROCESSED: |
| 374 | switch (chan->type) { |
| 375 | case IIO_LIGHT: |
| 376 | ret = isl29018_read_lux(chip, val); |
| 377 | break; |
| 378 | case IIO_INTENSITY: |
| 379 | ret = isl29018_read_ir(chip, val); |
| 380 | break; |
| 381 | case IIO_PROXIMITY: |
| 382 | ret = isl29018_read_proximity_ir(chip, |
| 383 | chip->prox_scheme, val); |
| 384 | break; |
| 385 | default: |
| 386 | break; |
| 387 | } |
| 388 | if (!ret) |
| 389 | ret = IIO_VAL_INT; |
| 390 | break; |
| 391 | case IIO_CHAN_INFO_CALIBSCALE: |
| 392 | if (chan->type == IIO_LIGHT) { |
| 393 | *val = chip->lux_scale; |
| 394 | *val2 = chip->lux_uscale; |
| 395 | ret = IIO_VAL_INT_PLUS_MICRO; |
| 396 | } |
| 397 | break; |
| 398 | default: |
| 399 | break; |
| 400 | } |
| 401 | mutex_unlock(&chip->lock); |
| 402 | return ret; |
| 403 | } |
| 404 | |
| 405 | static const struct iio_chan_spec isl29018_channels[] = { |
| 406 | { |
| 407 | .type = IIO_LIGHT, |
| 408 | .indexed = 1, |
| 409 | .channel = 0, |
| 410 | .info_mask = IIO_CHAN_INFO_PROCESSED_SEPARATE_BIT | |
| 411 | IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT, |
| 412 | }, { |
| 413 | .type = IIO_INTENSITY, |
| 414 | .modified = 1, |
| 415 | .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT, |
| 416 | .channel2 = IIO_MOD_LIGHT_IR, |
| 417 | }, { |
| 418 | /* Unindexed in current ABI. But perhaps it should be. */ |
| 419 | .type = IIO_PROXIMITY, |
| 420 | .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT, |
| 421 | } |
| 422 | }; |
| 423 | |
| 424 | static IIO_DEVICE_ATTR(range, S_IRUGO | S_IWUSR, show_range, store_range, 0); |
| 425 | static IIO_CONST_ATTR(range_available, "1000 4000 16000 64000"); |
| 426 | static IIO_CONST_ATTR(adc_resolution_available, "4 8 12 16"); |
| 427 | static IIO_DEVICE_ATTR(adc_resolution, S_IRUGO | S_IWUSR, |
| 428 | show_resolution, store_resolution, 0); |
| 429 | static IIO_DEVICE_ATTR(proximity_on_chip_ambient_infrared_suppression, |
| 430 | S_IRUGO | S_IWUSR, |
| 431 | show_prox_infrared_suppression, |
| 432 | store_prox_infrared_suppression, 0); |
| 433 | |
| 434 | #define ISL29018_DEV_ATTR(name) (&iio_dev_attr_##name.dev_attr.attr) |
| 435 | #define ISL29018_CONST_ATTR(name) (&iio_const_attr_##name.dev_attr.attr) |
| 436 | static struct attribute *isl29018_attributes[] = { |
| 437 | ISL29018_DEV_ATTR(range), |
| 438 | ISL29018_CONST_ATTR(range_available), |
| 439 | ISL29018_DEV_ATTR(adc_resolution), |
| 440 | ISL29018_CONST_ATTR(adc_resolution_available), |
| 441 | ISL29018_DEV_ATTR(proximity_on_chip_ambient_infrared_suppression), |
| 442 | NULL |
| 443 | }; |
| 444 | |
| 445 | static const struct attribute_group isl29108_group = { |
| 446 | .attrs = isl29018_attributes, |
| 447 | }; |
| 448 | |
| 449 | static int isl29018_chip_init(struct isl29018_chip *chip) |
| 450 | { |
| 451 | int status; |
| 452 | int new_adc_bit; |
| 453 | unsigned int new_range; |
| 454 | |
| 455 | /* Code added per Intersil Application Note 1534: |
| 456 | * When VDD sinks to approximately 1.8V or below, some of |
| 457 | * the part's registers may change their state. When VDD |
| 458 | * recovers to 2.25V (or greater), the part may thus be in an |
| 459 | * unknown mode of operation. The user can return the part to |
| 460 | * a known mode of operation either by (a) setting VDD = 0V for |
| 461 | * 1 second or more and then powering back up with a slew rate |
| 462 | * of 0.5V/ms or greater, or (b) via I2C disable all ALS/PROX |
| 463 | * conversions, clear the test registers, and then rewrite all |
| 464 | * registers to the desired values. |
| 465 | * ... |
| 466 | * FOR ISL29011, ISL29018, ISL29021, ISL29023 |
| 467 | * 1. Write 0x00 to register 0x08 (TEST) |
| 468 | * 2. Write 0x00 to register 0x00 (CMD1) |
| 469 | * 3. Rewrite all registers to the desired values |
| 470 | * |
| 471 | * ISL29018 Data Sheet (FN6619.1, Feb 11, 2010) essentially says |
| 472 | * the same thing EXCEPT the data sheet asks for a 1ms delay after |
| 473 | * writing the CMD1 register. |
| 474 | */ |
| 475 | status = regmap_write(chip->regmap, ISL29018_REG_TEST, 0x0); |
| 476 | if (status < 0) { |
| 477 | dev_err(chip->dev, "Failed to clear isl29018 TEST reg." |
| 478 | "(%d)\n", status); |
| 479 | return status; |
| 480 | } |
| 481 | |
| 482 | /* See Intersil AN1534 comments above. |
| 483 | * "Operating Mode" (COMMAND1) register is reprogrammed when |
| 484 | * data is read from the device. |
| 485 | */ |
| 486 | status = regmap_write(chip->regmap, ISL29018_REG_ADD_COMMAND1, 0); |
| 487 | if (status < 0) { |
| 488 | dev_err(chip->dev, "Failed to clear isl29018 CMD1 reg." |
| 489 | "(%d)\n", status); |
| 490 | return status; |
| 491 | } |
| 492 | |
| 493 | msleep(1); /* per data sheet, page 10 */ |
| 494 | |
| 495 | /* set defaults */ |
| 496 | status = isl29018_set_range(chip, chip->range, &new_range); |
| 497 | if (status < 0) { |
| 498 | dev_err(chip->dev, "Init of isl29018 fails\n"); |
| 499 | return status; |
| 500 | } |
| 501 | |
| 502 | status = isl29018_set_resolution(chip, chip->adc_bit, |
| 503 | &new_adc_bit); |
| 504 | |
| 505 | return 0; |
| 506 | } |
| 507 | |
| 508 | static const struct iio_info isl29108_info = { |
| 509 | .attrs = &isl29108_group, |
| 510 | .driver_module = THIS_MODULE, |
| 511 | .read_raw = &isl29018_read_raw, |
| 512 | .write_raw = &isl29018_write_raw, |
| 513 | }; |
| 514 | |
| 515 | static bool is_volatile_reg(struct device *dev, unsigned int reg) |
| 516 | { |
| 517 | switch (reg) { |
| 518 | case ISL29018_REG_ADD_DATA_LSB: |
| 519 | case ISL29018_REG_ADD_DATA_MSB: |
| 520 | case ISL29018_REG_ADD_COMMAND1: |
| 521 | case ISL29018_REG_TEST: |
| 522 | return true; |
| 523 | default: |
| 524 | return false; |
| 525 | } |
| 526 | } |
| 527 | |
| 528 | /* |
| 529 | * isl29018_regmap_config: regmap configuration. |
| 530 | * Use RBTREE mechanism for caching. |
| 531 | */ |
| 532 | static const struct regmap_config isl29018_regmap_config = { |
| 533 | .reg_bits = 8, |
| 534 | .val_bits = 8, |
| 535 | .volatile_reg = is_volatile_reg, |
| 536 | .max_register = ISL29018_REG_TEST, |
| 537 | .num_reg_defaults_raw = ISL29018_REG_TEST + 1, |
| 538 | .cache_type = REGCACHE_RBTREE, |
| 539 | }; |
| 540 | |
| 541 | static int __devinit isl29018_probe(struct i2c_client *client, |
| 542 | const struct i2c_device_id *id) |
| 543 | { |
| 544 | struct isl29018_chip *chip; |
| 545 | struct iio_dev *indio_dev; |
| 546 | int err; |
| 547 | |
| 548 | indio_dev = iio_device_alloc(sizeof(*chip)); |
| 549 | if (indio_dev == NULL) { |
| 550 | dev_err(&client->dev, "iio allocation fails\n"); |
| 551 | err = -ENOMEM; |
| 552 | goto exit; |
| 553 | } |
| 554 | chip = iio_priv(indio_dev); |
| 555 | |
| 556 | i2c_set_clientdata(client, indio_dev); |
| 557 | chip->dev = &client->dev; |
| 558 | |
| 559 | mutex_init(&chip->lock); |
| 560 | |
| 561 | chip->lux_scale = 1; |
| 562 | chip->range = 1000; |
| 563 | chip->adc_bit = 16; |
| 564 | |
| 565 | chip->regmap = devm_regmap_init_i2c(client, &isl29018_regmap_config); |
| 566 | if (IS_ERR(chip->regmap)) { |
| 567 | err = PTR_ERR(chip->regmap); |
| 568 | dev_err(chip->dev, "regmap initialization failed: %d\n", err); |
| 569 | goto exit; |
| 570 | } |
| 571 | |
| 572 | err = isl29018_chip_init(chip); |
| 573 | if (err) |
| 574 | goto exit_iio_free; |
| 575 | |
| 576 | indio_dev->info = &isl29108_info; |
| 577 | indio_dev->channels = isl29018_channels; |
| 578 | indio_dev->num_channels = ARRAY_SIZE(isl29018_channels); |
| 579 | indio_dev->name = id->name; |
| 580 | indio_dev->dev.parent = &client->dev; |
| 581 | indio_dev->modes = INDIO_DIRECT_MODE; |
| 582 | err = iio_device_register(indio_dev); |
| 583 | if (err) { |
| 584 | dev_err(&client->dev, "iio registration fails\n"); |
| 585 | goto exit_iio_free; |
| 586 | } |
| 587 | |
| 588 | return 0; |
| 589 | exit_iio_free: |
| 590 | iio_device_free(indio_dev); |
| 591 | exit: |
| 592 | return err; |
| 593 | } |
| 594 | |
| 595 | static int __devexit isl29018_remove(struct i2c_client *client) |
| 596 | { |
| 597 | struct iio_dev *indio_dev = i2c_get_clientdata(client); |
| 598 | |
| 599 | dev_dbg(&client->dev, "%s()\n", __func__); |
| 600 | iio_device_unregister(indio_dev); |
| 601 | iio_device_free(indio_dev); |
| 602 | |
| 603 | return 0; |
| 604 | } |
| 605 | |
| 606 | static const struct i2c_device_id isl29018_id[] = { |
| 607 | {"isl29018", 0}, |
| 608 | {} |
| 609 | }; |
| 610 | |
| 611 | MODULE_DEVICE_TABLE(i2c, isl29018_id); |
| 612 | |
| 613 | static const struct of_device_id isl29018_of_match[] = { |
| 614 | { .compatible = "isil,isl29018", }, |
| 615 | { }, |
| 616 | }; |
| 617 | MODULE_DEVICE_TABLE(of, isl29018_of_match); |
| 618 | |
| 619 | static struct i2c_driver isl29018_driver = { |
| 620 | .class = I2C_CLASS_HWMON, |
| 621 | .driver = { |
| 622 | .name = "isl29018", |
| 623 | .owner = THIS_MODULE, |
| 624 | .of_match_table = isl29018_of_match, |
| 625 | }, |
| 626 | .probe = isl29018_probe, |
| 627 | .remove = __devexit_p(isl29018_remove), |
| 628 | .id_table = isl29018_id, |
| 629 | }; |
| 630 | module_i2c_driver(isl29018_driver); |
| 631 | |
| 632 | MODULE_DESCRIPTION("ISL29018 Ambient Light Sensor driver"); |
| 633 | MODULE_LICENSE("GPL"); |