drivers/iio/light/isl29018.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
isl29018_set_integration_time
isl29018_set_scale
isl29018_read_sensor_input
isl29018_read_lux
isl29018_read_ir
isl29018_read_proximity_ir
isl29018_write_raw
isl29018_read_raw
isl29018_chip_init
isl29018_is_volatile_reg
isl29018_match_acpi_device
isl29018_disable_regulator_action
isl29018_probe
isl29018_suspend
isl29018_resume
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * A iio driver for the light sensor ISL 29018/29023/29035.
   4  *
   5  * IIO driver for monitoring ambient light intensity in luxi, proximity
   6  * sensing and infrared sensing.
   7  *
   8  * Copyright (c) 2010, NVIDIA Corporation.
   9  */
  10 
  11 #include <linux/module.h>
  12 #include <linux/i2c.h>
  13 #include <linux/err.h>
  14 #include <linux/mutex.h>
  15 #include <linux/delay.h>
  16 #include <linux/regmap.h>
  17 #include <linux/regulator/consumer.h>
  18 #include <linux/slab.h>
  19 #include <linux/iio/iio.h>
  20 #include <linux/iio/sysfs.h>
  21 #include <linux/acpi.h>
  22 
  23 #define ISL29018_CONV_TIME_MS           100
  24 
  25 #define ISL29018_REG_ADD_COMMAND1       0x00
  26 #define ISL29018_CMD1_OPMODE_SHIFT      5
  27 #define ISL29018_CMD1_OPMODE_MASK       (7 << ISL29018_CMD1_OPMODE_SHIFT)
  28 #define ISL29018_CMD1_OPMODE_POWER_DOWN 0
  29 #define ISL29018_CMD1_OPMODE_ALS_ONCE   1
  30 #define ISL29018_CMD1_OPMODE_IR_ONCE    2
  31 #define ISL29018_CMD1_OPMODE_PROX_ONCE  3
  32 
  33 #define ISL29018_REG_ADD_COMMAND2       0x01
  34 #define ISL29018_CMD2_RESOLUTION_SHIFT  2
  35 #define ISL29018_CMD2_RESOLUTION_MASK   (0x3 << ISL29018_CMD2_RESOLUTION_SHIFT)
  36 
  37 #define ISL29018_CMD2_RANGE_SHIFT       0
  38 #define ISL29018_CMD2_RANGE_MASK        (0x3 << ISL29018_CMD2_RANGE_SHIFT)
  39 
  40 #define ISL29018_CMD2_SCHEME_SHIFT      7
  41 #define ISL29018_CMD2_SCHEME_MASK       (0x1 << ISL29018_CMD2_SCHEME_SHIFT)
  42 
  43 #define ISL29018_REG_ADD_DATA_LSB       0x02
  44 #define ISL29018_REG_ADD_DATA_MSB       0x03
  45 
  46 #define ISL29018_REG_TEST               0x08
  47 #define ISL29018_TEST_SHIFT             0
  48 #define ISL29018_TEST_MASK              (0xFF << ISL29018_TEST_SHIFT)
  49 
  50 #define ISL29035_REG_DEVICE_ID          0x0F
  51 #define ISL29035_DEVICE_ID_SHIFT        0x03
  52 #define ISL29035_DEVICE_ID_MASK         (0x7 << ISL29035_DEVICE_ID_SHIFT)
  53 #define ISL29035_DEVICE_ID              0x5
  54 #define ISL29035_BOUT_SHIFT             0x07
  55 #define ISL29035_BOUT_MASK              (0x01 << ISL29035_BOUT_SHIFT)
  56 
  57 enum isl29018_int_time {
  58         ISL29018_INT_TIME_16,
  59         ISL29018_INT_TIME_12,
  60         ISL29018_INT_TIME_8,
  61         ISL29018_INT_TIME_4,
  62 };
  63 
  64 static const unsigned int isl29018_int_utimes[3][4] = {
  65         {90000, 5630, 351, 21},
  66         {90000, 5600, 352, 22},
  67         {105000, 6500, 410, 25},
  68 };
  69 
  70 static const struct isl29018_scale {
  71         unsigned int scale;
  72         unsigned int uscale;
  73 } isl29018_scales[4][4] = {
  74         { {0, 15258}, {0, 61035}, {0, 244140}, {0, 976562} },
  75         { {0, 244140}, {0, 976562}, {3, 906250}, {15, 625000} },
  76         { {3, 906250}, {15, 625000}, {62, 500000}, {250, 0} },
  77         { {62, 500000}, {250, 0}, {1000, 0}, {4000, 0} }
  78 };
  79 
  80 struct isl29018_chip {
  81         struct regmap           *regmap;
  82         struct mutex            lock;
  83         int                     type;
  84         unsigned int            calibscale;
  85         unsigned int            ucalibscale;
  86         unsigned int            int_time;
  87         struct isl29018_scale   scale;
  88         int                     prox_scheme;
  89         bool                    suspended;
  90         struct regulator        *vcc_reg;
  91 };
  92 
  93 static int isl29018_set_integration_time(struct isl29018_chip *chip,
  94                                          unsigned int utime)
  95 {
  96         unsigned int i;
  97         int ret;
  98         unsigned int int_time, new_int_time;
  99 
 100         for (i = 0; i < ARRAY_SIZE(isl29018_int_utimes[chip->type]); ++i) {
 101                 if (utime == isl29018_int_utimes[chip->type][i]) {
 102                         new_int_time = i;
 103                         break;
 104                 }
 105         }
 106 
 107         if (i >= ARRAY_SIZE(isl29018_int_utimes[chip->type]))
 108                 return -EINVAL;
 109 
 110         ret = regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMAND2,
 111                                  ISL29018_CMD2_RESOLUTION_MASK,
 112                                  i << ISL29018_CMD2_RESOLUTION_SHIFT);
 113         if (ret < 0)
 114                 return ret;
 115 
 116         /* Keep the same range when integration time changes */
 117         int_time = chip->int_time;
 118         for (i = 0; i < ARRAY_SIZE(isl29018_scales[int_time]); ++i) {
 119                 if (chip->scale.scale == isl29018_scales[int_time][i].scale &&
 120                     chip->scale.uscale == isl29018_scales[int_time][i].uscale) {
 121                         chip->scale = isl29018_scales[new_int_time][i];
 122                         break;
 123                 }
 124         }
 125         chip->int_time = new_int_time;
 126 
 127         return 0;
 128 }
 129 
 130 static int isl29018_set_scale(struct isl29018_chip *chip, int scale, int uscale)
 131 {
 132         unsigned int i;
 133         int ret;
 134         struct isl29018_scale new_scale;
 135 
 136         for (i = 0; i < ARRAY_SIZE(isl29018_scales[chip->int_time]); ++i) {
 137                 if (scale == isl29018_scales[chip->int_time][i].scale &&
 138                     uscale == isl29018_scales[chip->int_time][i].uscale) {
 139                         new_scale = isl29018_scales[chip->int_time][i];
 140                         break;
 141                 }
 142         }
 143 
 144         if (i >= ARRAY_SIZE(isl29018_scales[chip->int_time]))
 145                 return -EINVAL;
 146 
 147         ret = regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMAND2,
 148                                  ISL29018_CMD2_RANGE_MASK,
 149                                  i << ISL29018_CMD2_RANGE_SHIFT);
 150         if (ret < 0)
 151                 return ret;
 152 
 153         chip->scale = new_scale;
 154 
 155         return 0;
 156 }
 157 
 158 static int isl29018_read_sensor_input(struct isl29018_chip *chip, int mode)
 159 {
 160         int status;
 161         unsigned int lsb;
 162         unsigned int msb;
 163         struct device *dev = regmap_get_device(chip->regmap);
 164 
 165         /* Set mode */
 166         status = regmap_write(chip->regmap, ISL29018_REG_ADD_COMMAND1,
 167                               mode << ISL29018_CMD1_OPMODE_SHIFT);
 168         if (status) {
 169                 dev_err(dev,
 170                         "Error in setting operating mode err %d\n", status);
 171                 return status;
 172         }
 173         msleep(ISL29018_CONV_TIME_MS);
 174         status = regmap_read(chip->regmap, ISL29018_REG_ADD_DATA_LSB, &lsb);
 175         if (status < 0) {
 176                 dev_err(dev,
 177                         "Error in reading LSB DATA with err %d\n", status);
 178                 return status;
 179         }
 180 
 181         status = regmap_read(chip->regmap, ISL29018_REG_ADD_DATA_MSB, &msb);
 182         if (status < 0) {
 183                 dev_err(dev,
 184                         "Error in reading MSB DATA with error %d\n", status);
 185                 return status;
 186         }
 187         dev_vdbg(dev, "MSB 0x%x and LSB 0x%x\n", msb, lsb);
 188 
 189         return (msb << 8) | lsb;
 190 }
 191 
 192 static int isl29018_read_lux(struct isl29018_chip *chip, int *lux)
 193 {
 194         int lux_data;
 195         unsigned int data_x_range;
 196 
 197         lux_data = isl29018_read_sensor_input(chip,
 198                                               ISL29018_CMD1_OPMODE_ALS_ONCE);
 199         if (lux_data < 0)
 200                 return lux_data;
 201 
 202         data_x_range = lux_data * chip->scale.scale +
 203                        lux_data * chip->scale.uscale / 1000000;
 204         *lux = data_x_range * chip->calibscale +
 205                data_x_range * chip->ucalibscale / 1000000;
 206 
 207         return 0;
 208 }
 209 
 210 static int isl29018_read_ir(struct isl29018_chip *chip, int *ir)
 211 {
 212         int ir_data;
 213 
 214         ir_data = isl29018_read_sensor_input(chip,
 215                                              ISL29018_CMD1_OPMODE_IR_ONCE);
 216         if (ir_data < 0)
 217                 return ir_data;
 218 
 219         *ir = ir_data;
 220 
 221         return 0;
 222 }
 223 
 224 static int isl29018_read_proximity_ir(struct isl29018_chip *chip, int scheme,
 225                                       int *near_ir)
 226 {
 227         int status;
 228         int prox_data = -1;
 229         int ir_data = -1;
 230         struct device *dev = regmap_get_device(chip->regmap);
 231 
 232         /* Do proximity sensing with required scheme */
 233         status = regmap_update_bits(chip->regmap, ISL29018_REG_ADD_COMMAND2,
 234                                     ISL29018_CMD2_SCHEME_MASK,
 235                                     scheme << ISL29018_CMD2_SCHEME_SHIFT);
 236         if (status) {
 237                 dev_err(dev, "Error in setting operating mode\n");
 238                 return status;
 239         }
 240 
 241         prox_data = isl29018_read_sensor_input(chip,
 242                                                ISL29018_CMD1_OPMODE_PROX_ONCE);
 243         if (prox_data < 0)
 244                 return prox_data;
 245 
 246         if (scheme == 1) {
 247                 *near_ir = prox_data;
 248                 return 0;
 249         }
 250 
 251         ir_data = isl29018_read_sensor_input(chip,
 252                                              ISL29018_CMD1_OPMODE_IR_ONCE);
 253         if (ir_data < 0)
 254                 return ir_data;
 255 
 256         if (prox_data >= ir_data)
 257                 *near_ir = prox_data - ir_data;
 258         else
 259                 *near_ir = 0;
 260 
 261         return 0;
 262 }
 263 
 264 static ssize_t in_illuminance_scale_available_show
 265                         (struct device *dev, struct device_attribute *attr,
 266                          char *buf)
 267 {
 268         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 269         struct isl29018_chip *chip = iio_priv(indio_dev);
 270         unsigned int i;
 271         int len = 0;
 272 
 273         mutex_lock(&chip->lock);
 274         for (i = 0; i < ARRAY_SIZE(isl29018_scales[chip->int_time]); ++i)
 275                 len += sprintf(buf + len, "%d.%06d ",
 276                                isl29018_scales[chip->int_time][i].scale,
 277                                isl29018_scales[chip->int_time][i].uscale);
 278         mutex_unlock(&chip->lock);
 279 
 280         buf[len - 1] = '\n';
 281 
 282         return len;
 283 }
 284 
 285 static ssize_t in_illuminance_integration_time_available_show
 286                         (struct device *dev, struct device_attribute *attr,
 287                          char *buf)
 288 {
 289         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 290         struct isl29018_chip *chip = iio_priv(indio_dev);
 291         unsigned int i;
 292         int len = 0;
 293 
 294         for (i = 0; i < ARRAY_SIZE(isl29018_int_utimes[chip->type]); ++i)
 295                 len += sprintf(buf + len, "0.%06d ",
 296                                isl29018_int_utimes[chip->type][i]);
 297 
 298         buf[len - 1] = '\n';
 299 
 300         return len;
 301 }
 302 
 303 /*
 304  * From ISL29018 Data Sheet (FN6619.4, Oct 8, 2012) regarding the
 305  * infrared suppression:
 306  *
 307  *   Proximity Sensing Scheme: Bit 7. This bit programs the function
 308  * of the proximity detection. Logic 0 of this bit, Scheme 0, makes
 309  * full n (4, 8, 12, 16) bits (unsigned) proximity detection. The range
 310  * of Scheme 0 proximity count is from 0 to 2^n. Logic 1 of this bit,
 311  * Scheme 1, makes n-1 (3, 7, 11, 15) bits (2's complementary)
 312  * proximity_less_ambient detection. The range of Scheme 1
 313  * proximity count is from -2^(n-1) to 2^(n-1) . The sign bit is extended
 314  * for resolutions less than 16. While Scheme 0 has wider dynamic
 315  * range, Scheme 1 proximity detection is less affected by the
 316  * ambient IR noise variation.
 317  *
 318  * 0 Sensing IR from LED and ambient
 319  * 1 Sensing IR from LED with ambient IR rejection
 320  */
 321 static ssize_t proximity_on_chip_ambient_infrared_suppression_show
 322                         (struct device *dev, struct device_attribute *attr,
 323                          char *buf)
 324 {
 325         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 326         struct isl29018_chip *chip = iio_priv(indio_dev);
 327 
 328         /*
 329          * Return the "proximity scheme" i.e. if the chip does on chip
 330          * infrared suppression (1 means perform on chip suppression)
 331          */
 332         return sprintf(buf, "%d\n", chip->prox_scheme);
 333 }
 334 
 335 static ssize_t proximity_on_chip_ambient_infrared_suppression_store
 336                         (struct device *dev, struct device_attribute *attr,
 337                          const char *buf, size_t count)
 338 {
 339         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 340         struct isl29018_chip *chip = iio_priv(indio_dev);
 341         int val;
 342 
 343         if (kstrtoint(buf, 10, &val))
 344                 return -EINVAL;
 345         if (!(val == 0 || val == 1))
 346                 return -EINVAL;
 347 
 348         /*
 349          * Get the "proximity scheme" i.e. if the chip does on chip
 350          * infrared suppression (1 means perform on chip suppression)
 351          */
 352         mutex_lock(&chip->lock);
 353         chip->prox_scheme = val;
 354         mutex_unlock(&chip->lock);
 355 
 356         return count;
 357 }
 358 
 359 static int isl29018_write_raw(struct iio_dev *indio_dev,
 360                               struct iio_chan_spec const *chan,
 361                               int val,
 362                               int val2,
 363                               long mask)
 364 {
 365         struct isl29018_chip *chip = iio_priv(indio_dev);
 366         int ret = -EINVAL;
 367 
 368         mutex_lock(&chip->lock);
 369         if (chip->suspended) {
 370                 ret = -EBUSY;
 371                 goto write_done;
 372         }
 373         switch (mask) {
 374         case IIO_CHAN_INFO_CALIBSCALE:
 375                 if (chan->type == IIO_LIGHT) {
 376                         chip->calibscale = val;
 377                         chip->ucalibscale = val2;
 378                         ret = 0;
 379                 }
 380                 break;
 381         case IIO_CHAN_INFO_INT_TIME:
 382                 if (chan->type == IIO_LIGHT && !val)
 383                         ret = isl29018_set_integration_time(chip, val2);
 384                 break;
 385         case IIO_CHAN_INFO_SCALE:
 386                 if (chan->type == IIO_LIGHT)
 387                         ret = isl29018_set_scale(chip, val, val2);
 388                 break;
 389         default:
 390                 break;
 391         }
 392 
 393 write_done:
 394         mutex_unlock(&chip->lock);
 395 
 396         return ret;
 397 }
 398 
 399 static int isl29018_read_raw(struct iio_dev *indio_dev,
 400                              struct iio_chan_spec const *chan,
 401                              int *val,
 402                              int *val2,
 403                              long mask)
 404 {
 405         int ret = -EINVAL;
 406         struct isl29018_chip *chip = iio_priv(indio_dev);
 407 
 408         mutex_lock(&chip->lock);
 409         if (chip->suspended) {
 410                 ret = -EBUSY;
 411                 goto read_done;
 412         }
 413         switch (mask) {
 414         case IIO_CHAN_INFO_RAW:
 415         case IIO_CHAN_INFO_PROCESSED:
 416                 switch (chan->type) {
 417                 case IIO_LIGHT:
 418                         ret = isl29018_read_lux(chip, val);
 419                         break;
 420                 case IIO_INTENSITY:
 421                         ret = isl29018_read_ir(chip, val);
 422                         break;
 423                 case IIO_PROXIMITY:
 424                         ret = isl29018_read_proximity_ir(chip,
 425                                                          chip->prox_scheme,
 426                                                          val);
 427                         break;
 428                 default:
 429                         break;
 430                 }
 431                 if (!ret)
 432                         ret = IIO_VAL_INT;
 433                 break;
 434         case IIO_CHAN_INFO_INT_TIME:
 435                 if (chan->type == IIO_LIGHT) {
 436                         *val = 0;
 437                         *val2 = isl29018_int_utimes[chip->type][chip->int_time];
 438                         ret = IIO_VAL_INT_PLUS_MICRO;
 439                 }
 440                 break;
 441         case IIO_CHAN_INFO_SCALE:
 442                 if (chan->type == IIO_LIGHT) {
 443                         *val = chip->scale.scale;
 444                         *val2 = chip->scale.uscale;
 445                         ret = IIO_VAL_INT_PLUS_MICRO;
 446                 }
 447                 break;
 448         case IIO_CHAN_INFO_CALIBSCALE:
 449                 if (chan->type == IIO_LIGHT) {
 450                         *val = chip->calibscale;
 451                         *val2 = chip->ucalibscale;
 452                         ret = IIO_VAL_INT_PLUS_MICRO;
 453                 }
 454                 break;
 455         default:
 456                 break;
 457         }
 458 
 459 read_done:
 460         mutex_unlock(&chip->lock);
 461 
 462         return ret;
 463 }
 464 
 465 #define ISL29018_LIGHT_CHANNEL {                                        \
 466         .type = IIO_LIGHT,                                              \
 467         .indexed = 1,                                                   \
 468         .channel = 0,                                                   \
 469         .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |            \
 470         BIT(IIO_CHAN_INFO_CALIBSCALE) |                                 \
 471         BIT(IIO_CHAN_INFO_SCALE) |                                      \
 472         BIT(IIO_CHAN_INFO_INT_TIME),                                    \
 473 }
 474 
 475 #define ISL29018_IR_CHANNEL {                                           \
 476         .type = IIO_INTENSITY,                                          \
 477         .modified = 1,                                                  \
 478         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),                   \
 479         .channel2 = IIO_MOD_LIGHT_IR,                                   \
 480 }
 481 
 482 #define ISL29018_PROXIMITY_CHANNEL {                                    \
 483         .type = IIO_PROXIMITY,                                          \
 484         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),                   \
 485 }
 486 
 487 static const struct iio_chan_spec isl29018_channels[] = {
 488         ISL29018_LIGHT_CHANNEL,
 489         ISL29018_IR_CHANNEL,
 490         ISL29018_PROXIMITY_CHANNEL,
 491 };
 492 
 493 static const struct iio_chan_spec isl29023_channels[] = {
 494         ISL29018_LIGHT_CHANNEL,
 495         ISL29018_IR_CHANNEL,
 496 };
 497 
 498 static IIO_DEVICE_ATTR_RO(in_illuminance_integration_time_available, 0);
 499 static IIO_DEVICE_ATTR_RO(in_illuminance_scale_available, 0);
 500 static IIO_DEVICE_ATTR_RW(proximity_on_chip_ambient_infrared_suppression, 0);
 501 
 502 #define ISL29018_DEV_ATTR(name) (&iio_dev_attr_##name.dev_attr.attr)
 503 
 504 static struct attribute *isl29018_attributes[] = {
 505         ISL29018_DEV_ATTR(in_illuminance_scale_available),
 506         ISL29018_DEV_ATTR(in_illuminance_integration_time_available),
 507         ISL29018_DEV_ATTR(proximity_on_chip_ambient_infrared_suppression),
 508         NULL
 509 };
 510 
 511 static struct attribute *isl29023_attributes[] = {
 512         ISL29018_DEV_ATTR(in_illuminance_scale_available),
 513         ISL29018_DEV_ATTR(in_illuminance_integration_time_available),
 514         NULL
 515 };
 516 
 517 static const struct attribute_group isl29018_group = {
 518         .attrs = isl29018_attributes,
 519 };
 520 
 521 static const struct attribute_group isl29023_group = {
 522         .attrs = isl29023_attributes,
 523 };
 524 
 525 enum {
 526         isl29018,
 527         isl29023,
 528         isl29035,
 529 };
 530 
 531 static int isl29018_chip_init(struct isl29018_chip *chip)
 532 {
 533         int status;
 534         struct device *dev = regmap_get_device(chip->regmap);
 535 
 536         if (chip->type == isl29035) {
 537                 unsigned int id;
 538 
 539                 status = regmap_read(chip->regmap, ISL29035_REG_DEVICE_ID, &id);
 540                 if (status < 0) {
 541                         dev_err(dev,
 542                                 "Error reading ID register with error %d\n",
 543                                 status);
 544                         return status;
 545                 }
 546 
 547                 id = (id & ISL29035_DEVICE_ID_MASK) >> ISL29035_DEVICE_ID_SHIFT;
 548 
 549                 if (id != ISL29035_DEVICE_ID)
 550                         return -ENODEV;
 551 
 552                 /* Clear brownout bit */
 553                 status = regmap_update_bits(chip->regmap,
 554                                             ISL29035_REG_DEVICE_ID,
 555                                             ISL29035_BOUT_MASK, 0);
 556                 if (status < 0)
 557                         return status;
 558         }
 559 
 560         /*
 561          * Code added per Intersil Application Note 1534:
 562          *     When VDD sinks to approximately 1.8V or below, some of
 563          * the part's registers may change their state. When VDD
 564          * recovers to 2.25V (or greater), the part may thus be in an
 565          * unknown mode of operation. The user can return the part to
 566          * a known mode of operation either by (a) setting VDD = 0V for
 567          * 1 second or more and then powering back up with a slew rate
 568          * of 0.5V/ms or greater, or (b) via I2C disable all ALS/PROX
 569          * conversions, clear the test registers, and then rewrite all
 570          * registers to the desired values.
 571          * ...
 572          * For ISL29011, ISL29018, ISL29021, ISL29023
 573          * 1. Write 0x00 to register 0x08 (TEST)
 574          * 2. Write 0x00 to register 0x00 (CMD1)
 575          * 3. Rewrite all registers to the desired values
 576          *
 577          * ISL29018 Data Sheet (FN6619.1, Feb 11, 2010) essentially says
 578          * the same thing EXCEPT the data sheet asks for a 1ms delay after
 579          * writing the CMD1 register.
 580          */
 581         status = regmap_write(chip->regmap, ISL29018_REG_TEST, 0x0);
 582         if (status < 0) {
 583                 dev_err(dev, "Failed to clear isl29018 TEST reg.(%d)\n",
 584                         status);
 585                 return status;
 586         }
 587 
 588         /*
 589          * See Intersil AN1534 comments above.
 590          * "Operating Mode" (COMMAND1) register is reprogrammed when
 591          * data is read from the device.
 592          */
 593         status = regmap_write(chip->regmap, ISL29018_REG_ADD_COMMAND1, 0);
 594         if (status < 0) {
 595                 dev_err(dev, "Failed to clear isl29018 CMD1 reg.(%d)\n",
 596                         status);
 597                 return status;
 598         }
 599 
 600         usleep_range(1000, 2000);       /* per data sheet, page 10 */
 601 
 602         /* Set defaults */
 603         status = isl29018_set_scale(chip, chip->scale.scale,
 604                                     chip->scale.uscale);
 605         if (status < 0) {
 606                 dev_err(dev, "Init of isl29018 fails\n");
 607                 return status;
 608         }
 609 
 610         status = isl29018_set_integration_time(chip,
 611                         isl29018_int_utimes[chip->type][chip->int_time]);
 612         if (status < 0)
 613                 dev_err(dev, "Init of isl29018 fails\n");
 614 
 615         return status;
 616 }
 617 
 618 static const struct iio_info isl29018_info = {
 619         .attrs = &isl29018_group,
 620         .read_raw = isl29018_read_raw,
 621         .write_raw = isl29018_write_raw,
 622 };
 623 
 624 static const struct iio_info isl29023_info = {
 625         .attrs = &isl29023_group,
 626         .read_raw = isl29018_read_raw,
 627         .write_raw = isl29018_write_raw,
 628 };
 629 
 630 static bool isl29018_is_volatile_reg(struct device *dev, unsigned int reg)
 631 {
 632         switch (reg) {
 633         case ISL29018_REG_ADD_DATA_LSB:
 634         case ISL29018_REG_ADD_DATA_MSB:
 635         case ISL29018_REG_ADD_COMMAND1:
 636         case ISL29018_REG_TEST:
 637         case ISL29035_REG_DEVICE_ID:
 638                 return true;
 639         default:
 640                 return false;
 641         }
 642 }
 643 
 644 static const struct regmap_config isl29018_regmap_config = {
 645         .reg_bits = 8,
 646         .val_bits = 8,
 647         .volatile_reg = isl29018_is_volatile_reg,
 648         .max_register = ISL29018_REG_TEST,
 649         .num_reg_defaults_raw = ISL29018_REG_TEST + 1,
 650         .cache_type = REGCACHE_RBTREE,
 651 };
 652 
 653 static const struct regmap_config isl29035_regmap_config = {
 654         .reg_bits = 8,
 655         .val_bits = 8,
 656         .volatile_reg = isl29018_is_volatile_reg,
 657         .max_register = ISL29035_REG_DEVICE_ID,
 658         .num_reg_defaults_raw = ISL29035_REG_DEVICE_ID + 1,
 659         .cache_type = REGCACHE_RBTREE,
 660 };
 661 
 662 struct isl29018_chip_info {
 663         const struct iio_chan_spec *channels;
 664         int num_channels;
 665         const struct iio_info *indio_info;
 666         const struct regmap_config *regmap_cfg;
 667 };
 668 
 669 static const struct isl29018_chip_info isl29018_chip_info_tbl[] = {
 670         [isl29018] = {
 671                 .channels = isl29018_channels,
 672                 .num_channels = ARRAY_SIZE(isl29018_channels),
 673                 .indio_info = &isl29018_info,
 674                 .regmap_cfg = &isl29018_regmap_config,
 675         },
 676         [isl29023] = {
 677                 .channels = isl29023_channels,
 678                 .num_channels = ARRAY_SIZE(isl29023_channels),
 679                 .indio_info = &isl29023_info,
 680                 .regmap_cfg = &isl29018_regmap_config,
 681         },
 682         [isl29035] = {
 683                 .channels = isl29023_channels,
 684                 .num_channels = ARRAY_SIZE(isl29023_channels),
 685                 .indio_info = &isl29023_info,
 686                 .regmap_cfg = &isl29035_regmap_config,
 687         },
 688 };
 689 
 690 static const char *isl29018_match_acpi_device(struct device *dev, int *data)
 691 {
 692         const struct acpi_device_id *id;
 693 
 694         id = acpi_match_device(dev->driver->acpi_match_table, dev);
 695 
 696         if (!id)
 697                 return NULL;
 698 
 699         *data = (int)id->driver_data;
 700 
 701         return dev_name(dev);
 702 }
 703 
 704 static void isl29018_disable_regulator_action(void *_data)
 705 {
 706         struct isl29018_chip *chip = _data;
 707         int err;
 708 
 709         err = regulator_disable(chip->vcc_reg);
 710         if (err)
 711                 pr_err("failed to disable isl29018's VCC regulator!\n");
 712 }
 713 
 714 static int isl29018_probe(struct i2c_client *client,
 715                           const struct i2c_device_id *id)
 716 {
 717         struct isl29018_chip *chip;
 718         struct iio_dev *indio_dev;
 719         int err;
 720         const char *name = NULL;
 721         int dev_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, indio_dev);
 730 
 731         if (id) {
 732                 name = id->name;
 733                 dev_id = id->driver_data;
 734         }
 735 
 736         if (ACPI_HANDLE(&client->dev))
 737                 name = isl29018_match_acpi_device(&client->dev, &dev_id);
 738 
 739         mutex_init(&chip->lock);
 740 
 741         chip->type = dev_id;
 742         chip->calibscale = 1;
 743         chip->ucalibscale = 0;
 744         chip->int_time = ISL29018_INT_TIME_16;
 745         chip->scale = isl29018_scales[chip->int_time][0];
 746         chip->suspended = false;
 747 
 748         chip->vcc_reg = devm_regulator_get(&client->dev, "vcc");
 749         if (IS_ERR(chip->vcc_reg)) {
 750                 err = PTR_ERR(chip->vcc_reg);
 751                 if (err != -EPROBE_DEFER)
 752                         dev_err(&client->dev, "failed to get VCC regulator!\n");
 753                 return err;
 754         }
 755 
 756         err = regulator_enable(chip->vcc_reg);
 757         if (err) {
 758                 dev_err(&client->dev, "failed to enable VCC regulator!\n");
 759                 return err;
 760         }
 761 
 762         err = devm_add_action_or_reset(&client->dev, isl29018_disable_regulator_action,
 763                                  chip);
 764         if (err) {
 765                 dev_err(&client->dev, "failed to setup regulator cleanup action!\n");
 766                 return err;
 767         }
 768 
 769         chip->regmap = devm_regmap_init_i2c(client,
 770                                 isl29018_chip_info_tbl[dev_id].regmap_cfg);
 771         if (IS_ERR(chip->regmap)) {
 772                 err = PTR_ERR(chip->regmap);
 773                 dev_err(&client->dev, "regmap initialization fails: %d\n", err);
 774                 return err;
 775         }
 776 
 777         err = isl29018_chip_init(chip);
 778         if (err)
 779                 return err;
 780 
 781         indio_dev->info = isl29018_chip_info_tbl[dev_id].indio_info;
 782         indio_dev->channels = isl29018_chip_info_tbl[dev_id].channels;
 783         indio_dev->num_channels = isl29018_chip_info_tbl[dev_id].num_channels;
 784         indio_dev->name = name;
 785         indio_dev->dev.parent = &client->dev;
 786         indio_dev->modes = INDIO_DIRECT_MODE;
 787 
 788         return devm_iio_device_register(&client->dev, indio_dev);
 789 }
 790 
 791 #ifdef CONFIG_PM_SLEEP
 792 static int isl29018_suspend(struct device *dev)
 793 {
 794         struct isl29018_chip *chip = iio_priv(dev_get_drvdata(dev));
 795         int ret;
 796 
 797         mutex_lock(&chip->lock);
 798 
 799         /*
 800          * Since this driver uses only polling commands, we are by default in
 801          * auto shutdown (ie, power-down) mode.
 802          * So we do not have much to do here.
 803          */
 804         chip->suspended = true;
 805         ret = regulator_disable(chip->vcc_reg);
 806         if (ret)
 807                 dev_err(dev, "failed to disable VCC regulator\n");
 808 
 809         mutex_unlock(&chip->lock);
 810 
 811         return ret;
 812 }
 813 
 814 static int isl29018_resume(struct device *dev)
 815 {
 816         struct isl29018_chip *chip = iio_priv(dev_get_drvdata(dev));
 817         int err;
 818 
 819         mutex_lock(&chip->lock);
 820 
 821         err = regulator_enable(chip->vcc_reg);
 822         if (err) {
 823                 dev_err(dev, "failed to enable VCC regulator\n");
 824                 mutex_unlock(&chip->lock);
 825                 return err;
 826         }
 827 
 828         err = isl29018_chip_init(chip);
 829         if (!err)
 830                 chip->suspended = false;
 831 
 832         mutex_unlock(&chip->lock);
 833 
 834         return err;
 835 }
 836 
 837 static SIMPLE_DEV_PM_OPS(isl29018_pm_ops, isl29018_suspend, isl29018_resume);
 838 #define ISL29018_PM_OPS (&isl29018_pm_ops)
 839 #else
 840 #define ISL29018_PM_OPS NULL
 841 #endif
 842 
 843 #ifdef CONFIG_ACPI
 844 static const struct acpi_device_id isl29018_acpi_match[] = {
 845         {"ISL29018", isl29018},
 846         {"ISL29023", isl29023},
 847         {"ISL29035", isl29035},
 848         {},
 849 };
 850 MODULE_DEVICE_TABLE(acpi, isl29018_acpi_match);
 851 #endif
 852 
 853 static const struct i2c_device_id isl29018_id[] = {
 854         {"isl29018", isl29018},
 855         {"isl29023", isl29023},
 856         {"isl29035", isl29035},
 857         {}
 858 };
 859 MODULE_DEVICE_TABLE(i2c, isl29018_id);
 860 
 861 static const struct of_device_id isl29018_of_match[] = {
 862         { .compatible = "isil,isl29018", },
 863         { .compatible = "isil,isl29023", },
 864         { .compatible = "isil,isl29035", },
 865         { },
 866 };
 867 MODULE_DEVICE_TABLE(of, isl29018_of_match);
 868 
 869 static struct i2c_driver isl29018_driver = {
 870         .driver  = {
 871                         .name = "isl29018",
 872                         .acpi_match_table = ACPI_PTR(isl29018_acpi_match),
 873                         .pm = ISL29018_PM_OPS,
 874                         .of_match_table = isl29018_of_match,
 875                     },
 876         .probe   = isl29018_probe,
 877         .id_table = isl29018_id,
 878 };
 879 module_i2c_driver(isl29018_driver);
 880 
 881 MODULE_DESCRIPTION("ISL29018 Ambient Light Sensor driver");
 882 MODULE_LICENSE("GPL");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/iio/light/isl29018.c

DEFINITIONS
