drivers/iio/light/adux1020.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * adux1020.c - Support for Analog Devices ADUX1020 photometric sensor
   4  *
   5  * Copyright (C) 2019 Linaro Ltd.
   6  * Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
   7  *
   8  * TODO: Triggered buffer support
   9  */
  10
  11 #include <linux/bitfield.h>
  12 #include <linux/delay.h>
  13 #include <linux/err.h>
  14 #include <linux/i2c.h>
  15 #include <linux/init.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/irq.h>
  18 #include <linux/module.h>
  19 #include <linux/mutex.h>
  20 #include <linux/regmap.h>
  21
  22 #include <linux/iio/iio.h>
  23 #include <linux/iio/sysfs.h>
  24 #include <linux/iio/events.h>
  25
  26 #define ADUX1020_REGMAP_NAME            "adux1020_regmap"
  27 #define ADUX1020_DRV_NAME               "adux1020"
  28
  29 /* System registers */
  30 #define ADUX1020_REG_CHIP_ID            0x08
  31 #define ADUX1020_REG_SLAVE_ADDRESS      0x09
  32
  33 #define ADUX1020_REG_SW_RESET           0x0f
  34 #define ADUX1020_REG_INT_ENABLE         0x1c
  35 #define ADUX1020_REG_INT_POLARITY       0x1d
  36 #define ADUX1020_REG_PROX_TH_ON1        0x2a
  37 #define ADUX1020_REG_PROX_TH_OFF1       0x2b
  38 #define ADUX1020_REG_PROX_TYPE          0x2f
  39 #define ADUX1020_REG_TEST_MODES_3       0x32
  40 #define ADUX1020_REG_FORCE_MODE         0x33
  41 #define ADUX1020_REG_FREQUENCY          0x40
  42 #define ADUX1020_REG_LED_CURRENT        0x41
  43 #define ADUX1020_REG_OP_MODE            0x45
  44 #define ADUX1020_REG_INT_MASK           0x48
  45 #define ADUX1020_REG_INT_STATUS         0x49
  46 #define ADUX1020_REG_DATA_BUFFER        0x60
  47
  48 /* Chip ID bits */
  49 #define ADUX1020_CHIP_ID_MASK           GENMASK(11, 0)
  50 #define ADUX1020_CHIP_ID                0x03fc
  51
  52 #define ADUX1020_SW_RESET               BIT(1)
  53 #define ADUX1020_FIFO_FLUSH             BIT(15)
  54 #define ADUX1020_OP_MODE_MASK           GENMASK(3, 0)
  55 #define ADUX1020_DATA_OUT_MODE_MASK     GENMASK(7, 4)
  56 #define ADUX1020_DATA_OUT_PROX_I        FIELD_PREP(ADUX1020_DATA_OUT_MODE_MASK, 1)
  57
  58 #define ADUX1020_MODE_INT_MASK          GENMASK(7, 0)
  59 #define ADUX1020_INT_ENABLE             0x2094
  60 #define ADUX1020_INT_DISABLE            0x2090
  61 #define ADUX1020_PROX_INT_ENABLE        0x00f0
  62 #define ADUX1020_PROX_ON1_INT           BIT(0)
  63 #define ADUX1020_PROX_OFF1_INT          BIT(1)
  64 #define ADUX1020_FIFO_INT_ENABLE        0x7f
  65 #define ADUX1020_MODE_INT_DISABLE       0xff
  66 #define ADUX1020_MODE_INT_STATUS_MASK   GENMASK(7, 0)
  67 #define ADUX1020_FIFO_STATUS_MASK       GENMASK(15, 8)
  68 #define ADUX1020_INT_CLEAR              0xff
  69 #define ADUX1020_PROX_TYPE              BIT(15)
  70
  71 #define ADUX1020_INT_PROX_ON1           BIT(0)
  72 #define ADUX1020_INT_PROX_OFF1          BIT(1)
  73
  74 #define ADUX1020_FORCE_CLOCK_ON         0x0f4f
  75 #define ADUX1020_FORCE_CLOCK_RESET      0x0040
  76 #define ADUX1020_ACTIVE_4_STATE         0x0008
  77
  78 #define ADUX1020_PROX_FREQ_MASK         GENMASK(7, 4)
  79 #define ADUX1020_PROX_FREQ(x)           FIELD_PREP(ADUX1020_PROX_FREQ_MASK, x)
  80
  81 #define ADUX1020_LED_CURRENT_MASK       GENMASK(3, 0)
  82 #define ADUX1020_LED_PIREF_EN           BIT(12)
  83
  84 /* Operating modes */
  85 enum adux1020_op_modes {
  86         ADUX1020_MODE_STANDBY,
  87         ADUX1020_MODE_PROX_I,
  88         ADUX1020_MODE_PROX_XY,
  89         ADUX1020_MODE_GEST,
  90         ADUX1020_MODE_SAMPLE,
  91         ADUX1020_MODE_FORCE = 0x0e,
  92         ADUX1020_MODE_IDLE = 0x0f,
  93 };
  94
  95 struct adux1020_data {
  96         struct i2c_client *client;
  97         struct iio_dev *indio_dev;
  98         struct mutex lock;
  99         struct regmap *regmap;
 100 };
 101
 102 struct adux1020_mode_data {
 103         u8 bytes;
 104         u8 buf_len;
 105         u16 int_en;
 106 };
 107
 108 static const struct adux1020_mode_data adux1020_modes[] = {
 109         [ADUX1020_MODE_PROX_I] = {
 110                 .bytes = 2,
 111                 .buf_len = 1,
 112                 .int_en = ADUX1020_PROX_INT_ENABLE,
 113         },
 114 };
 115
 116 static const struct regmap_config adux1020_regmap_config = {
 117         .name = ADUX1020_REGMAP_NAME,
 118         .reg_bits = 8,
 119         .val_bits = 16,
 120         .max_register = 0x6F,
 121         .cache_type = REGCACHE_NONE,
 122 };
 123
 124 static const struct reg_sequence adux1020_def_conf[] = {
 125         { 0x000c, 0x000f },
 126         { 0x0010, 0x1010 },
 127         { 0x0011, 0x004c },
 128         { 0x0012, 0x5f0c },
 129         { 0x0013, 0xada5 },
 130         { 0x0014, 0x0080 },
 131         { 0x0015, 0x0000 },
 132         { 0x0016, 0x0600 },
 133         { 0x0017, 0x0000 },
 134         { 0x0018, 0x2693 },
 135         { 0x0019, 0x0004 },
 136         { 0x001a, 0x4280 },
 137         { 0x001b, 0x0060 },
 138         { 0x001c, 0x2094 },
 139         { 0x001d, 0x0020 },
 140         { 0x001e, 0x0001 },
 141         { 0x001f, 0x0100 },
 142         { 0x0020, 0x0320 },
 143         { 0x0021, 0x0A13 },
 144         { 0x0022, 0x0320 },
 145         { 0x0023, 0x0113 },
 146         { 0x0024, 0x0000 },
 147         { 0x0025, 0x2412 },
 148         { 0x0026, 0x2412 },
 149         { 0x0027, 0x0022 },
 150         { 0x0028, 0x0000 },
 151         { 0x0029, 0x0300 },
 152         { 0x002a, 0x0700 },
 153         { 0x002b, 0x0600 },
 154         { 0x002c, 0x6000 },
 155         { 0x002d, 0x4000 },
 156         { 0x002e, 0x0000 },
 157         { 0x002f, 0x0000 },
 158         { 0x0030, 0x0000 },
 159         { 0x0031, 0x0000 },
 160         { 0x0032, 0x0040 },
 161         { 0x0033, 0x0008 },
 162         { 0x0034, 0xE400 },
 163         { 0x0038, 0x8080 },
 164         { 0x0039, 0x8080 },
 165         { 0x003a, 0x2000 },
 166         { 0x003b, 0x1f00 },
 167         { 0x003c, 0x2000 },
 168         { 0x003d, 0x2000 },
 169         { 0x003e, 0x0000 },
 170         { 0x0040, 0x8069 },
 171         { 0x0041, 0x1f2f },
 172         { 0x0042, 0x4000 },
 173         { 0x0043, 0x0000 },
 174         { 0x0044, 0x0008 },
 175         { 0x0046, 0x0000 },
 176         { 0x0048, 0x00ef },
 177         { 0x0049, 0x0000 },
 178         { 0x0045, 0x0000 },
 179 };
 180
 181 static const int adux1020_rates[][2] = {
 182         { 0, 100000 },
 183         { 0, 200000 },
 184         { 0, 500000 },
 185         { 1, 0 },
 186         { 2, 0 },
 187         { 5, 0 },
 188         { 10, 0 },
 189         { 20, 0 },
 190         { 50, 0 },
 191         { 100, 0 },
 192         { 190, 0 },
 193         { 450, 0 },
 194         { 820, 0 },
 195         { 1400, 0 },
 196 };
 197
 198 static const int adux1020_led_currents[][2] = {
 199         { 0, 25000 },
 200         { 0, 40000 },
 201         { 0, 55000 },
 202         { 0, 70000 },
 203         { 0, 85000 },
 204         { 0, 100000 },
 205         { 0, 115000 },
 206         { 0, 130000 },
 207         { 0, 145000 },
 208         { 0, 160000 },
 209         { 0, 175000 },
 210         { 0, 190000 },
 211         { 0, 205000 },
 212         { 0, 220000 },
 213         { 0, 235000 },
 214         { 0, 250000 },
 215 };
 216
 217 static int adux1020_flush_fifo(struct adux1020_data *data)
 218 {
 219         int ret;
 220
 221         /* Force Idle mode */
 222         ret = regmap_write(data->regmap, ADUX1020_REG_FORCE_MODE,
 223                            ADUX1020_ACTIVE_4_STATE);
 224         if (ret < 0)
 225                 return ret;
 226
 227         ret = regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE,
 228                                  ADUX1020_OP_MODE_MASK, ADUX1020_MODE_FORCE);
 229         if (ret < 0)
 230                 return ret;
 231
 232         ret = regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE,
 233                                  ADUX1020_OP_MODE_MASK, ADUX1020_MODE_IDLE);
 234         if (ret < 0)
 235                 return ret;
 236
 237         /* Flush FIFO */
 238         ret = regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3,
 239                            ADUX1020_FORCE_CLOCK_ON);
 240         if (ret < 0)
 241                 return ret;
 242
 243         ret = regmap_write(data->regmap, ADUX1020_REG_INT_STATUS,
 244                            ADUX1020_FIFO_FLUSH);
 245         if (ret < 0)
 246                 return ret;
 247
 248         return regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3,
 249                             ADUX1020_FORCE_CLOCK_RESET);
 250 }
 251
 252 static int adux1020_read_fifo(struct adux1020_data *data, u16 *buf, u8 buf_len)
 253 {
 254         unsigned int regval;
 255         int i, ret;
 256
 257         /* Enable 32MHz clock */
 258         ret = regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3,
 259                            ADUX1020_FORCE_CLOCK_ON);
 260         if (ret < 0)
 261                 return ret;
 262
 263         for (i = 0; i < buf_len; i++) {
 264                 ret = regmap_read(data->regmap, ADUX1020_REG_DATA_BUFFER,
 265                                   &regval);
 266                 if (ret < 0)
 267                         return ret;
 268
 269                 buf[i] = regval;
 270         }
 271
 272         /* Set 32MHz clock to be controlled by internal state machine */
 273         return regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3,
 274                             ADUX1020_FORCE_CLOCK_RESET);
 275 }
 276
 277 static int adux1020_set_mode(struct adux1020_data *data,
 278                              enum adux1020_op_modes mode)
 279 {
 280         int ret;
 281
 282         /* Switch to standby mode before changing the mode */
 283         ret = regmap_write(data->regmap, ADUX1020_REG_OP_MODE,
 284                            ADUX1020_MODE_STANDBY);
 285         if (ret < 0)
 286                 return ret;
 287
 288         /* Set data out and switch to the desired mode */
 289         switch (mode) {
 290         case ADUX1020_MODE_PROX_I:
 291                 ret = regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE,
 292                                          ADUX1020_DATA_OUT_MODE_MASK,
 293                                          ADUX1020_DATA_OUT_PROX_I);
 294                 if (ret < 0)
 295                         return ret;
 296
 297                 ret = regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE,
 298                                          ADUX1020_OP_MODE_MASK,
 299                                          ADUX1020_MODE_PROX_I);
 300                 if (ret < 0)
 301                         return ret;
 302                 break;
 303         default:
 304                 return -EINVAL;
 305         }
 306
 307         return 0;
 308 }
 309
 310 static int adux1020_measure(struct adux1020_data *data,
 311                             enum adux1020_op_modes mode,
 312                             u16 *val)
 313 {
 314         unsigned int status;
 315         int ret, tries = 50;
 316
 317         /* Disable INT pin as polling is going to be used */
 318         ret = regmap_write(data->regmap, ADUX1020_REG_INT_ENABLE,
 319                            ADUX1020_INT_DISABLE);
 320         if (ret < 0)
 321                 return ret;
 322
 323         /* Enable mode interrupt */
 324         ret = regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK,
 325                                  ADUX1020_MODE_INT_MASK,
 326                                  adux1020_modes[mode].int_en);
 327         if (ret < 0)
 328                 return ret;
 329
 330         while (tries--) {
 331                 ret = regmap_read(data->regmap, ADUX1020_REG_INT_STATUS,
 332                                   &status);
 333                 if (ret < 0)
 334                         return ret;
 335
 336                 status &= ADUX1020_FIFO_STATUS_MASK;
 337                 if (status >= adux1020_modes[mode].bytes)
 338                         break;
 339                 msleep(20);
 340         }
 341
 342         if (tries < 0)
 343                 return -EIO;
 344
 345         ret = adux1020_read_fifo(data, val, adux1020_modes[mode].buf_len);
 346         if (ret < 0)
 347                 return ret;
 348
 349         /* Clear mode interrupt */
 350         ret = regmap_write(data->regmap, ADUX1020_REG_INT_STATUS,
 351                            (~adux1020_modes[mode].int_en));
 352         if (ret < 0)
 353                 return ret;
 354
 355         /* Disable mode interrupts */
 356         return regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK,
 357                                   ADUX1020_MODE_INT_MASK,
 358                                   ADUX1020_MODE_INT_DISABLE);
 359 }
 360
 361 static int adux1020_read_raw(struct iio_dev *indio_dev,
 362                              struct iio_chan_spec const *chan,
 363                              int *val, int *val2, long mask)
 364 {
 365         struct adux1020_data *data = iio_priv(indio_dev);
 366         u16 buf[3];
 367         int ret = -EINVAL;
 368         unsigned int regval;
 369
 370         mutex_lock(&data->lock);
 371
 372         switch (mask) {
 373         case IIO_CHAN_INFO_RAW:
 374                 switch (chan->type) {
 375                 case IIO_PROXIMITY:
 376                         ret = adux1020_set_mode(data, ADUX1020_MODE_PROX_I);
 377                         if (ret < 0)
 378                                 goto fail;
 379
 380                         ret = adux1020_measure(data, ADUX1020_MODE_PROX_I, buf);
 381                         if (ret < 0)
 382                                 goto fail;
 383
 384                         *val = buf[0];
 385                         ret = IIO_VAL_INT;
 386                         break;
 387                 default:
 388                         break;
 389                 }
 390                 break;
 391         case IIO_CHAN_INFO_PROCESSED:
 392                 switch (chan->type) {
 393                 case IIO_CURRENT:
 394                         ret = regmap_read(data->regmap,
 395                                           ADUX1020_REG_LED_CURRENT, &regval);
 396                         if (ret < 0)
 397                                 goto fail;
 398
 399                         regval = regval & ADUX1020_LED_CURRENT_MASK;
 400
 401                         *val = adux1020_led_currents[regval][0];
 402                         *val2 = adux1020_led_currents[regval][1];
 403
 404                         ret = IIO_VAL_INT_PLUS_MICRO;
 405                         break;
 406                 default:
 407                         break;
 408                 }
 409                 break;
 410         case IIO_CHAN_INFO_SAMP_FREQ:
 411                 switch (chan->type) {
 412                 case IIO_PROXIMITY:
 413                         ret = regmap_read(data->regmap, ADUX1020_REG_FREQUENCY,
 414                                           &regval);
 415                         if (ret < 0)
 416                                 goto fail;
 417
 418                         regval = FIELD_GET(ADUX1020_PROX_FREQ_MASK, regval);
 419
 420                         *val = adux1020_rates[regval][0];
 421                         *val2 = adux1020_rates[regval][1];
 422
 423                         ret = IIO_VAL_INT_PLUS_MICRO;
 424                         break;
 425                 default:
 426                         break;
 427                 }
 428                 break;
 429         default:
 430                 break;
 431         }
 432
 433 fail:
 434         mutex_unlock(&data->lock);
 435
 436         return ret;
 437 };
 438
 439 static inline int adux1020_find_index(const int array[][2], int count, int val,
 440                                       int val2)
 441 {
 442         int i;
 443
 444         for (i = 0; i < count; i++)
 445                 if (val == array[i][0] && val2 == array[i][1])
 446                         return i;
 447
 448         return -EINVAL;
 449 }
 450
 451 static int adux1020_write_raw(struct iio_dev *indio_dev,
 452                               struct iio_chan_spec const *chan,
 453                               int val, int val2, long mask)
 454 {
 455         struct adux1020_data *data = iio_priv(indio_dev);
 456         int i, ret = -EINVAL;
 457
 458         mutex_lock(&data->lock);
 459
 460         switch (mask) {
 461         case IIO_CHAN_INFO_SAMP_FREQ:
 462                 if (chan->type == IIO_PROXIMITY) {
 463                         i = adux1020_find_index(adux1020_rates,
 464                                                 ARRAY_SIZE(adux1020_rates),
 465                                                 val, val2);
 466                         if (i < 0) {
 467                                 ret = i;
 468                                 goto fail;
 469                         }
 470
 471                         ret = regmap_update_bits(data->regmap,
 472                                                  ADUX1020_REG_FREQUENCY,
 473                                                  ADUX1020_PROX_FREQ_MASK,
 474                                                  ADUX1020_PROX_FREQ(i));
 475                 }
 476                 break;
 477         case IIO_CHAN_INFO_PROCESSED:
 478                 if (chan->type == IIO_CURRENT) {
 479                         i = adux1020_find_index(adux1020_led_currents,
 480                                         ARRAY_SIZE(adux1020_led_currents),
 481                                         val, val2);
 482                         if (i < 0) {
 483                                 ret = i;
 484                                 goto fail;
 485                         }
 486
 487                         ret = regmap_update_bits(data->regmap,
 488                                                  ADUX1020_REG_LED_CURRENT,
 489                                                  ADUX1020_LED_CURRENT_MASK, i);
 490                 }
 491                 break;
 492         default:
 493                 break;
 494         }
 495
 496 fail:
 497         mutex_unlock(&data->lock);
 498
 499         return ret;
 500 }
 501
 502 static int adux1020_write_event_config(struct iio_dev *indio_dev,
 503                                        const struct iio_chan_spec *chan,
 504                                        enum iio_event_type type,
 505                                        enum iio_event_direction dir, int state)
 506 {
 507         struct adux1020_data *data = iio_priv(indio_dev);
 508         int ret, mask;
 509
 510         mutex_lock(&data->lock);
 511
 512         ret = regmap_write(data->regmap, ADUX1020_REG_INT_ENABLE,
 513                            ADUX1020_INT_ENABLE);
 514         if (ret < 0)
 515                 goto fail;
 516
 517         ret = regmap_write(data->regmap, ADUX1020_REG_INT_POLARITY, 0);
 518         if (ret < 0)
 519                 goto fail;
 520
 521         switch (chan->type) {
 522         case IIO_PROXIMITY:
 523                 if (dir == IIO_EV_DIR_RISING)
 524                         mask = ADUX1020_PROX_ON1_INT;
 525                 else
 526                         mask = ADUX1020_PROX_OFF1_INT;
 527
 528                 if (state)
 529                         state = 0;
 530                 else
 531                         state = mask;
 532
 533                 ret = regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK,
 534                                          mask, state);
 535                 if (ret < 0)
 536                         goto fail;
 537
 538                 /*
 539                  * Trigger proximity interrupt when the intensity is above
 540                  * or below threshold
 541                  */
 542                 ret = regmap_update_bits(data->regmap, ADUX1020_REG_PROX_TYPE,
 543                                          ADUX1020_PROX_TYPE,
 544                                          ADUX1020_PROX_TYPE);
 545                 if (ret < 0)
 546                         goto fail;
 547
 548                 /* Set proximity mode */
 549                 ret = adux1020_set_mode(data, ADUX1020_MODE_PROX_I);
 550                 break;
 551         default:
 552                 ret = -EINVAL;
 553                 break;
 554         }
 555
 556 fail:
 557         mutex_unlock(&data->lock);
 558
 559         return ret;
 560 }
 561
 562 static int adux1020_read_event_config(struct iio_dev *indio_dev,
 563                                       const struct iio_chan_spec *chan,
 564                                       enum iio_event_type type,
 565                                       enum iio_event_direction dir)
 566 {
 567         struct adux1020_data *data = iio_priv(indio_dev);
 568         int ret, mask;
 569         unsigned int regval;
 570
 571         switch (chan->type) {
 572         case IIO_PROXIMITY:
 573                 if (dir == IIO_EV_DIR_RISING)
 574                         mask = ADUX1020_PROX_ON1_INT;
 575                 else
 576                         mask = ADUX1020_PROX_OFF1_INT;
 577                 break;
 578         default:
 579                 return -EINVAL;
 580         }
 581
 582         ret = regmap_read(data->regmap, ADUX1020_REG_INT_MASK, &regval);
 583         if (ret < 0)
 584                 return ret;
 585
 586         return !(regval & mask);
 587 }
 588
 589 static int adux1020_read_thresh(struct iio_dev *indio_dev,
 590                                 const struct iio_chan_spec *chan,
 591                                 enum iio_event_type type,
 592                                 enum iio_event_direction dir,
 593                                 enum iio_event_info info, int *val, int *val2)
 594 {
 595         struct adux1020_data *data = iio_priv(indio_dev);
 596         u8 reg;
 597         int ret;
 598         unsigned int regval;
 599
 600         switch (chan->type) {
 601         case IIO_PROXIMITY:
 602                 if (dir == IIO_EV_DIR_RISING)
 603                         reg = ADUX1020_REG_PROX_TH_ON1;
 604                 else
 605                         reg = ADUX1020_REG_PROX_TH_OFF1;
 606                 break;
 607         default:
 608                 return -EINVAL;
 609         }
 610
 611         ret = regmap_read(data->regmap, reg, &regval);
 612         if (ret < 0)
 613                 return ret;
 614
 615         *val = regval;
 616
 617         return IIO_VAL_INT;
 618 }
 619
 620 static int adux1020_write_thresh(struct iio_dev *indio_dev,
 621                                  const struct iio_chan_spec *chan,
 622                                  enum iio_event_type type,
 623                                  enum iio_event_direction dir,
 624                                  enum iio_event_info info, int val, int val2)
 625 {
 626         struct adux1020_data *data = iio_priv(indio_dev);
 627         u8 reg;
 628
 629         switch (chan->type) {
 630         case IIO_PROXIMITY:
 631                 if (dir == IIO_EV_DIR_RISING)
 632                         reg = ADUX1020_REG_PROX_TH_ON1;
 633                 else
 634                         reg = ADUX1020_REG_PROX_TH_OFF1;
 635                 break;
 636         default:
 637                 return -EINVAL;
 638         }
 639
 640         /* Full scale threshold value is 0-65535  */
 641         if (val < 0 || val > 65535)
 642                 return -EINVAL;
 643
 644         return regmap_write(data->regmap, reg, val);
 645 }
 646
 647 static const struct iio_event_spec adux1020_proximity_event[] = {
 648         {
 649                 .type = IIO_EV_TYPE_THRESH,
 650                 .dir = IIO_EV_DIR_RISING,
 651                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 652                         BIT(IIO_EV_INFO_ENABLE),
 653         },
 654         {
 655                 .type = IIO_EV_TYPE_THRESH,
 656                 .dir = IIO_EV_DIR_FALLING,
 657                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 658                         BIT(IIO_EV_INFO_ENABLE),
 659         },
 660 };
 661
 662 static const struct iio_chan_spec adux1020_channels[] = {
 663         {
 664                 .type = IIO_PROXIMITY,
 665                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 666                                       BIT(IIO_CHAN_INFO_SAMP_FREQ),
 667                 .event_spec = adux1020_proximity_event,
 668                 .num_event_specs = ARRAY_SIZE(adux1020_proximity_event),
 669         },
 670         {
 671                 .type = IIO_CURRENT,
 672                 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
 673                 .extend_name = "led",
 674                 .output = 1,
 675         },
 676 };
 677
 678 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(
 679                       "0.1 0.2 0.5 1 2 5 10 20 50 100 190 450 820 1400");
 680
 681 static struct attribute *adux1020_attributes[] = {
 682         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 683         NULL
 684 };
 685
 686 static const struct attribute_group adux1020_attribute_group = {
 687         .attrs = adux1020_attributes,
 688 };
 689
 690 static const struct iio_info adux1020_info = {
 691         .attrs = &adux1020_attribute_group,
 692         .read_raw = adux1020_read_raw,
 693         .write_raw = adux1020_write_raw,
 694         .read_event_config = adux1020_read_event_config,
 695         .write_event_config = adux1020_write_event_config,
 696         .read_event_value = adux1020_read_thresh,
 697         .write_event_value = adux1020_write_thresh,
 698 };
 699
 700 static irqreturn_t adux1020_interrupt_handler(int irq, void *private)
 701 {
 702         struct iio_dev *indio_dev = private;
 703         struct adux1020_data *data = iio_priv(indio_dev);
 704         int ret, status;
 705
 706         ret = regmap_read(data->regmap, ADUX1020_REG_INT_STATUS, &status);
 707         if (ret < 0)
 708                 return IRQ_HANDLED;
 709
 710         status &= ADUX1020_MODE_INT_STATUS_MASK;
 711
 712         if (status & ADUX1020_INT_PROX_ON1) {
 713                 iio_push_event(indio_dev,
 714                                IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
 715                                                     IIO_EV_TYPE_THRESH,
 716                                                     IIO_EV_DIR_RISING),
 717                                iio_get_time_ns(indio_dev));
 718         }
 719
 720         if (status & ADUX1020_INT_PROX_OFF1) {
 721                 iio_push_event(indio_dev,
 722                                IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
 723                                                     IIO_EV_TYPE_THRESH,
 724                                                     IIO_EV_DIR_FALLING),
 725                                iio_get_time_ns(indio_dev));
 726         }
 727
 728         regmap_update_bits(data->regmap, ADUX1020_REG_INT_STATUS,
 729                            ADUX1020_MODE_INT_MASK, ADUX1020_INT_CLEAR);
 730
 731         return IRQ_HANDLED;
 732 }
 733
 734 static int adux1020_chip_init(struct adux1020_data *data)
 735 {
 736         struct i2c_client *client = data->client;
 737         int ret;
 738         unsigned int val;
 739
 740         ret = regmap_read(data->regmap, ADUX1020_REG_CHIP_ID, &val);
 741         if (ret < 0)
 742                 return ret;
 743
 744         if ((val & ADUX1020_CHIP_ID_MASK) != ADUX1020_CHIP_ID) {
 745                 dev_err(&client->dev, "invalid chip id 0x%04x\n", val);
 746                 return -ENODEV;
 747         }
 748
 749         dev_dbg(&client->dev, "Detected ADUX1020 with chip id: 0x%04x\n", val);
 750
 751         ret = regmap_update_bits(data->regmap, ADUX1020_REG_SW_RESET,
 752                                  ADUX1020_SW_RESET, ADUX1020_SW_RESET);
 753         if (ret < 0)
 754                 return ret;
 755
 756         /* Load default configuration */
 757         ret = regmap_multi_reg_write(data->regmap, adux1020_def_conf,
 758                                      ARRAY_SIZE(adux1020_def_conf));
 759         if (ret < 0)
 760                 return ret;
 761
 762         ret = adux1020_flush_fifo(data);
 763         if (ret < 0)
 764                 return ret;
 765
 766         /* Use LED_IREF for proximity mode */
 767         ret = regmap_update_bits(data->regmap, ADUX1020_REG_LED_CURRENT,
 768                                  ADUX1020_LED_PIREF_EN, 0);
 769         if (ret < 0)
 770                 return ret;
 771
 772         /* Mask all interrupts */
 773         return regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK,
 774                            ADUX1020_MODE_INT_MASK, ADUX1020_MODE_INT_DISABLE);
 775 }
 776
 777 static int adux1020_probe(struct i2c_client *client,
 778                           const struct i2c_device_id *id)
 779 {
 780         struct adux1020_data *data;
 781         struct iio_dev *indio_dev;
 782         int ret;
 783
 784         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 785         if (!indio_dev)
 786                 return -ENOMEM;
 787
 788         indio_dev->dev.parent = &client->dev;
 789         indio_dev->info = &adux1020_info;
 790         indio_dev->name = ADUX1020_DRV_NAME;
 791         indio_dev->channels = adux1020_channels;
 792         indio_dev->num_channels = ARRAY_SIZE(adux1020_channels);
 793         indio_dev->modes = INDIO_DIRECT_MODE;
 794
 795         data = iio_priv(indio_dev);
 796
 797         data->regmap = devm_regmap_init_i2c(client, &adux1020_regmap_config);
 798         if (IS_ERR(data->regmap)) {
 799                 dev_err(&client->dev, "regmap initialization failed.\n");
 800                 return PTR_ERR(data->regmap);
 801         }
 802
 803         data->client = client;
 804         data->indio_dev = indio_dev;
 805         mutex_init(&data->lock);
 806
 807         ret = adux1020_chip_init(data);
 808         if (ret)
 809                 return ret;
 810
 811         if (client->irq) {
 812                 ret = devm_request_threaded_irq(&client->dev, client->irq,
 813                                         NULL, adux1020_interrupt_handler,
 814                                         IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
 815                                         ADUX1020_DRV_NAME, indio_dev);
 816                 if (ret) {
 817                         dev_err(&client->dev, "irq request error %d\n", -ret);
 818                         return ret;
 819                 }
 820         }
 821
 822         return devm_iio_device_register(&client->dev, indio_dev);
 823 }
 824
 825 static const struct i2c_device_id adux1020_id[] = {
 826         { "adux1020", 0 },
 827         {}
 828 };
 829 MODULE_DEVICE_TABLE(i2c, adux1020_id);
 830
 831 static const struct of_device_id adux1020_of_match[] = {
 832         { .compatible = "adi,adux1020" },
 833         { }
 834 };
 835 MODULE_DEVICE_TABLE(of, adux1020_of_match);
 836
 837 static struct i2c_driver adux1020_driver = {
 838         .driver = {
 839                 .name   = ADUX1020_DRV_NAME,
 840                 .of_match_table = adux1020_of_match,
 841         },
 842         .probe          = adux1020_probe,
 843         .id_table       = adux1020_id,
 844 };
 845 module_i2c_driver(adux1020_driver);
 846
 847 MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");
 848 MODULE_DESCRIPTION("ADUX1020 photometric sensor");
 849 MODULE_LICENSE("GPL");