drivers/iio/light/us5182d.c

   1 /*
   2  * Copyright (c) 2015 Intel Corporation
   3  *
   4  * Driver for UPISEMI us5182d Proximity and Ambient Light Sensor.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 as published by
   8  * the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * To do: Interrupt support.
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/acpi.h>
  21 #include <linux/delay.h>
  22 #include <linux/i2c.h>
  23 #include <linux/iio/events.h>
  24 #include <linux/iio/iio.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/irq.h>
  27 #include <linux/iio/sysfs.h>
  28 #include <linux/mutex.h>
  29 #include <linux/pm.h>
  30 #include <linux/pm_runtime.h>
  31
  32 #define US5182D_REG_CFG0                                0x00
  33 #define US5182D_CFG0_ONESHOT_EN                         BIT(6)
  34 #define US5182D_CFG0_SHUTDOWN_EN                        BIT(7)
  35 #define US5182D_CFG0_WORD_ENABLE                        BIT(0)
  36 #define US5182D_CFG0_PROX                               BIT(3)
  37 #define US5182D_CFG0_PX_IRQ                             BIT(2)
  38
  39 #define US5182D_REG_CFG1                                0x01
  40 #define US5182D_CFG1_ALS_RES16                          BIT(4)
  41 #define US5182D_CFG1_AGAIN_DEFAULT                      0x00
  42
  43 #define US5182D_REG_CFG2                                0x02
  44 #define US5182D_CFG2_PX_RES16                           BIT(4)
  45 #define US5182D_CFG2_PXGAIN_DEFAULT                     BIT(2)
  46
  47 #define US5182D_REG_CFG3                                0x03
  48 #define US5182D_CFG3_LED_CURRENT100                     (BIT(4) | BIT(5))
  49 #define US5182D_CFG3_INT_SOURCE_PX                      BIT(3)
  50
  51 #define US5182D_REG_CFG4                                0x10
  52
  53 /*
  54  * Registers for tuning the auto dark current cancelling feature.
  55  * DARK_TH(reg 0x27,0x28) - threshold (counts) for auto dark cancelling.
  56  * when ALS  > DARK_TH --> ALS_Code = ALS - Upper(0x2A) * Dark
  57  * when ALS < DARK_TH --> ALS_Code = ALS - Lower(0x29) * Dark
  58  */
  59 #define US5182D_REG_UDARK_TH                    0x27
  60 #define US5182D_REG_DARK_AUTO_EN                0x2b
  61 #define US5182D_REG_AUTO_LDARK_GAIN             0x29
  62 #define US5182D_REG_AUTO_HDARK_GAIN             0x2a
  63
  64 /* Thresholds for events: px low (0x08-l, 0x09-h), px high (0x0a-l 0x0b-h) */
  65 #define US5182D_REG_PXL_TH                      0x08
  66 #define US5182D_REG_PXH_TH                      0x0a
  67
  68 #define US5182D_REG_PXL_TH_DEFAULT              1000
  69 #define US5182D_REG_PXH_TH_DEFAULT              30000
  70
  71 #define US5182D_OPMODE_ALS                      0x01
  72 #define US5182D_OPMODE_PX                       0x02
  73 #define US5182D_OPMODE_SHIFT                    4
  74
  75 #define US5182D_REG_DARK_AUTO_EN_DEFAULT        0x80
  76 #define US5182D_REG_AUTO_LDARK_GAIN_DEFAULT     0x16
  77 #define US5182D_REG_AUTO_HDARK_GAIN_DEFAULT     0x00
  78
  79 #define US5182D_REG_ADL                         0x0c
  80 #define US5182D_REG_PDL                         0x0e
  81
  82 #define US5182D_REG_MODE_STORE                  0x21
  83 #define US5182D_STORE_MODE                      0x01
  84
  85 #define US5182D_REG_CHIPID                      0xb2
  86
  87 #define US5182D_OPMODE_MASK                     GENMASK(5, 4)
  88 #define US5182D_AGAIN_MASK                      0x07
  89 #define US5182D_RESET_CHIP                      0x01
  90
  91 #define US5182D_CHIPID                          0x26
  92 #define US5182D_DRV_NAME                        "us5182d"
  93
  94 #define US5182D_GA_RESOLUTION                   1000
  95
  96 #define US5182D_READ_BYTE                       1
  97 #define US5182D_READ_WORD                       2
  98 #define US5182D_OPSTORE_SLEEP_TIME              20 /* ms */
  99 #define US5182D_SLEEP_MS                        3000 /* ms */
 100 #define US5182D_PXH_TH_DISABLE                  0xffff
 101 #define US5182D_PXL_TH_DISABLE                  0x0000
 102
 103 /* Available ranges: [12354, 7065, 3998, 2202, 1285, 498, 256, 138] lux */
 104 static const int us5182d_scales[] = {188500, 107800, 61000, 33600, 19600, 7600,
 105                                      3900, 2100};
 106
 107 /*
 108  * Experimental thresholds that work with US5182D sensor on evaluation board
 109  * roughly between 12-32 lux
 110  */
 111 static u16 us5182d_dark_ths_vals[] = {170, 200, 512, 512, 800, 2000, 4000,
 112                                       8000};
 113
 114 enum mode {
 115         US5182D_ALS_PX,
 116         US5182D_ALS_ONLY,
 117         US5182D_PX_ONLY
 118 };
 119
 120 enum pmode {
 121         US5182D_CONTINUOUS,
 122         US5182D_ONESHOT
 123 };
 124
 125 struct us5182d_data {
 126         struct i2c_client *client;
 127         struct mutex lock;
 128
 129         /* Glass attenuation factor */
 130         u32 ga;
 131
 132         /* Dark gain tuning */
 133         u8 lower_dark_gain;
 134         u8 upper_dark_gain;
 135         u16 *us5182d_dark_ths;
 136
 137         u16 px_low_th;
 138         u16 px_high_th;
 139
 140         int rising_en;
 141         int falling_en;
 142
 143         u8 opmode;
 144         u8 power_mode;
 145
 146         bool als_enabled;
 147         bool px_enabled;
 148
 149         bool default_continuous;
 150 };
 151
 152 static IIO_CONST_ATTR(in_illuminance_scale_available,
 153                       "0.0021 0.0039 0.0076 0.0196 0.0336 0.061 0.1078 0.1885");
 154
 155 static struct attribute *us5182d_attrs[] = {
 156         &iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
 157         NULL
 158 };
 159
 160 static const struct attribute_group us5182d_attr_group = {
 161         .attrs = us5182d_attrs,
 162 };
 163
 164 static const struct {
 165         u8 reg;
 166         u8 val;
 167 } us5182d_regvals[] = {
 168         {US5182D_REG_CFG0, US5182D_CFG0_WORD_ENABLE},
 169         {US5182D_REG_CFG1, US5182D_CFG1_ALS_RES16},
 170         {US5182D_REG_CFG2, (US5182D_CFG2_PX_RES16 |
 171                             US5182D_CFG2_PXGAIN_DEFAULT)},
 172         {US5182D_REG_CFG3, US5182D_CFG3_LED_CURRENT100 |
 173                            US5182D_CFG3_INT_SOURCE_PX},
 174         {US5182D_REG_CFG4, 0x00},
 175 };
 176
 177 static const struct iio_event_spec us5182d_events[] = {
 178         {
 179                 .type = IIO_EV_TYPE_THRESH,
 180                 .dir = IIO_EV_DIR_RISING,
 181                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 182                                 BIT(IIO_EV_INFO_ENABLE),
 183         },
 184         {
 185                 .type = IIO_EV_TYPE_THRESH,
 186                 .dir = IIO_EV_DIR_FALLING,
 187                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 188                                 BIT(IIO_EV_INFO_ENABLE),
 189         },
 190 };
 191
 192 static const struct iio_chan_spec us5182d_channels[] = {
 193         {
 194                 .type = IIO_LIGHT,
 195                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 196                                       BIT(IIO_CHAN_INFO_SCALE),
 197         },
 198         {
 199                 .type = IIO_PROXIMITY,
 200                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 201                 .event_spec = us5182d_events,
 202                 .num_event_specs = ARRAY_SIZE(us5182d_events),
 203         }
 204 };
 205
 206 static int us5182d_oneshot_en(struct us5182d_data *data)
 207 {
 208         int ret;
 209
 210         ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG0);
 211         if (ret < 0)
 212                 return ret;
 213
 214         /*
 215          * In oneshot mode the chip will power itself down after taking the
 216          * required measurement.
 217          */
 218         ret = ret | US5182D_CFG0_ONESHOT_EN;
 219
 220         return i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG0, ret);
 221 }
 222
 223 static int us5182d_set_opmode(struct us5182d_data *data, u8 mode)
 224 {
 225         int ret;
 226
 227         if (mode == data->opmode)
 228                 return 0;
 229
 230         ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG0);
 231         if (ret < 0)
 232                 return ret;
 233
 234         /* update mode */
 235         ret = ret & ~US5182D_OPMODE_MASK;
 236         ret = ret | (mode << US5182D_OPMODE_SHIFT);
 237
 238         /*
 239          * After updating the operating mode, the chip requires that
 240          * the operation is stored, by writing 1 in the STORE_MODE
 241          * register (auto-clearing).
 242          */
 243         ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG0, ret);
 244         if (ret < 0)
 245                 return ret;
 246
 247         ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_MODE_STORE,
 248                                         US5182D_STORE_MODE);
 249         if (ret < 0)
 250                 return ret;
 251
 252         data->opmode = mode;
 253         msleep(US5182D_OPSTORE_SLEEP_TIME);
 254
 255         return 0;
 256 }
 257
 258 static int us5182d_als_enable(struct us5182d_data *data)
 259 {
 260         int ret;
 261         u8 mode;
 262
 263         if (data->power_mode == US5182D_ONESHOT) {
 264                 ret = us5182d_set_opmode(data, US5182D_ALS_ONLY);
 265                 if (ret < 0)
 266                         return ret;
 267                 data->px_enabled = false;
 268         }
 269
 270         if (data->als_enabled)
 271                 return 0;
 272
 273         mode = data->px_enabled ? US5182D_ALS_PX : US5182D_ALS_ONLY;
 274
 275         ret = us5182d_set_opmode(data, mode);
 276         if (ret < 0)
 277                 return ret;
 278
 279         data->als_enabled = true;
 280
 281         return 0;
 282 }
 283
 284 static int us5182d_px_enable(struct us5182d_data *data)
 285 {
 286         int ret;
 287         u8 mode;
 288
 289         if (data->power_mode == US5182D_ONESHOT) {
 290                 ret = us5182d_set_opmode(data, US5182D_PX_ONLY);
 291                 if (ret < 0)
 292                         return ret;
 293                 data->als_enabled = false;
 294         }
 295
 296         if (data->px_enabled)
 297                 return 0;
 298
 299         mode = data->als_enabled ? US5182D_ALS_PX : US5182D_PX_ONLY;
 300
 301         ret = us5182d_set_opmode(data, mode);
 302         if (ret < 0)
 303                 return ret;
 304
 305         data->px_enabled = true;
 306
 307         return 0;
 308 }
 309
 310 static int us5182d_get_als(struct us5182d_data *data)
 311 {
 312         int ret;
 313         unsigned long result;
 314
 315         ret = us5182d_als_enable(data);
 316         if (ret < 0)
 317                 return ret;
 318
 319         ret = i2c_smbus_read_word_data(data->client,
 320                                        US5182D_REG_ADL);
 321         if (ret < 0)
 322                 return ret;
 323
 324         result = ret * data->ga / US5182D_GA_RESOLUTION;
 325         if (result > 0xffff)
 326                 result = 0xffff;
 327
 328         return result;
 329 }
 330
 331 static int us5182d_get_px(struct us5182d_data *data)
 332 {
 333         int ret;
 334
 335         ret = us5182d_px_enable(data);
 336         if (ret < 0)
 337                 return ret;
 338
 339         return i2c_smbus_read_word_data(data->client,
 340                                         US5182D_REG_PDL);
 341 }
 342
 343 static int us5182d_shutdown_en(struct us5182d_data *data, u8 state)
 344 {
 345         int ret;
 346
 347         if (data->power_mode == US5182D_ONESHOT)
 348                 return 0;
 349
 350         ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG0);
 351         if (ret < 0)
 352                 return ret;
 353
 354         ret = ret & ~US5182D_CFG0_SHUTDOWN_EN;
 355         ret = ret | state;
 356
 357         ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG0, ret);
 358         if (ret < 0)
 359                 return ret;
 360
 361         if (state & US5182D_CFG0_SHUTDOWN_EN) {
 362                 data->als_enabled = false;
 363                 data->px_enabled = false;
 364         }
 365
 366         return ret;
 367 }
 368
 369
 370 static int us5182d_set_power_state(struct us5182d_data *data, bool on)
 371 {
 372         int ret;
 373
 374         if (data->power_mode == US5182D_ONESHOT)
 375                 return 0;
 376
 377         if (on) {
 378                 ret = pm_runtime_get_sync(&data->client->dev);
 379                 if (ret < 0)
 380                         pm_runtime_put_noidle(&data->client->dev);
 381         } else {
 382                 pm_runtime_mark_last_busy(&data->client->dev);
 383                 ret = pm_runtime_put_autosuspend(&data->client->dev);
 384         }
 385
 386         return ret;
 387 }
 388
 389 static int us5182d_read_value(struct us5182d_data *data,
 390                               struct iio_chan_spec const *chan)
 391 {
 392         int ret, value;
 393
 394         mutex_lock(&data->lock);
 395
 396         if (data->power_mode == US5182D_ONESHOT) {
 397                 ret = us5182d_oneshot_en(data);
 398                 if (ret < 0)
 399                         goto out_err;
 400         }
 401
 402         ret = us5182d_set_power_state(data, true);
 403         if (ret < 0)
 404                 goto out_err;
 405
 406         if (chan->type == IIO_LIGHT)
 407                 ret = us5182d_get_als(data);
 408         else
 409                 ret = us5182d_get_px(data);
 410         if (ret < 0)
 411                 goto out_poweroff;
 412
 413         value = ret;
 414
 415         ret = us5182d_set_power_state(data, false);
 416         if (ret < 0)
 417                 goto out_err;
 418
 419         mutex_unlock(&data->lock);
 420         return value;
 421
 422 out_poweroff:
 423         us5182d_set_power_state(data, false);
 424 out_err:
 425         mutex_unlock(&data->lock);
 426         return ret;
 427 }
 428
 429 static int us5182d_read_raw(struct iio_dev *indio_dev,
 430                             struct iio_chan_spec const *chan, int *val,
 431                             int *val2, long mask)
 432 {
 433         struct us5182d_data *data = iio_priv(indio_dev);
 434         int ret;
 435
 436         switch (mask) {
 437         case IIO_CHAN_INFO_RAW:
 438                 ret = us5182d_read_value(data, chan);
 439                 if (ret < 0)
 440                         return ret;
 441                 *val = ret;
 442                 return IIO_VAL_INT;
 443         case IIO_CHAN_INFO_SCALE:
 444                 ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG1);
 445                 if (ret < 0)
 446                         return ret;
 447                 *val = 0;
 448                 *val2 = us5182d_scales[ret & US5182D_AGAIN_MASK];
 449                 return IIO_VAL_INT_PLUS_MICRO;
 450         default:
 451                 return -EINVAL;
 452         }
 453 }
 454
 455 /**
 456  * us5182d_update_dark_th - update Darh_Th registers
 457  * @data        us5182d_data structure
 458  * @index       index in us5182d_dark_ths array to use for the updated value
 459  *
 460  * Function needs to be called with a lock held because it needs two i2c write
 461  * byte operations as these registers (0x27 0x28) don't work in word mode
 462  * accessing.
 463  */
 464 static int us5182d_update_dark_th(struct us5182d_data *data, int index)
 465 {
 466         __be16 dark_th = cpu_to_be16(data->us5182d_dark_ths[index]);
 467         int ret;
 468
 469         ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_UDARK_TH,
 470                                         ((u8 *)&dark_th)[0]);
 471         if (ret < 0)
 472                 return ret;
 473
 474         return i2c_smbus_write_byte_data(data->client, US5182D_REG_UDARK_TH + 1,
 475                                         ((u8 *)&dark_th)[1]);
 476 }
 477
 478 /**
 479  * us5182d_apply_scale - update the ALS scale
 480  * @data        us5182d_data structure
 481  * @index       index in us5182d_scales array to use for the updated value
 482  *
 483  * Function needs to be called with a lock held as we're having more than one
 484  * i2c operation.
 485  */
 486 static int us5182d_apply_scale(struct us5182d_data *data, int index)
 487 {
 488         int ret;
 489
 490         ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG1);
 491         if (ret < 0)
 492                 return ret;
 493
 494         ret = ret & (~US5182D_AGAIN_MASK);
 495         ret |= index;
 496
 497         ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG1, ret);
 498         if (ret < 0)
 499                 return ret;
 500
 501         return us5182d_update_dark_th(data, index);
 502 }
 503
 504 static int us5182d_write_raw(struct iio_dev *indio_dev,
 505                              struct iio_chan_spec const *chan, int val,
 506                              int val2, long mask)
 507 {
 508         struct us5182d_data *data = iio_priv(indio_dev);
 509         int ret, i;
 510
 511         switch (mask) {
 512         case IIO_CHAN_INFO_SCALE:
 513                 if (val != 0)
 514                         return -EINVAL;
 515                 for (i = 0; i < ARRAY_SIZE(us5182d_scales); i++)
 516                         if (val2 == us5182d_scales[i]) {
 517                                 mutex_lock(&data->lock);
 518                                 ret = us5182d_apply_scale(data, i);
 519                                 mutex_unlock(&data->lock);
 520                                 return ret;
 521                         }
 522                 break;
 523         default:
 524                 return -EINVAL;
 525         }
 526
 527         return -EINVAL;
 528 }
 529
 530 static int us5182d_setup_prox(struct iio_dev *indio_dev,
 531                               enum iio_event_direction dir, u16 val)
 532 {
 533         struct us5182d_data *data = iio_priv(indio_dev);
 534
 535         if (dir == IIO_EV_DIR_FALLING)
 536                 return i2c_smbus_write_word_data(data->client,
 537                                                  US5182D_REG_PXL_TH, val);
 538         else if (dir == IIO_EV_DIR_RISING)
 539                 return i2c_smbus_write_word_data(data->client,
 540                                                  US5182D_REG_PXH_TH, val);
 541
 542         return 0;
 543 }
 544
 545 static int us5182d_read_thresh(struct iio_dev *indio_dev,
 546         const struct iio_chan_spec *chan, enum iio_event_type type,
 547         enum iio_event_direction dir, enum iio_event_info info, int *val,
 548         int *val2)
 549 {
 550         struct us5182d_data *data = iio_priv(indio_dev);
 551
 552         switch (dir) {
 553         case IIO_EV_DIR_RISING:
 554                 mutex_lock(&data->lock);
 555                 *val = data->px_high_th;
 556                 mutex_unlock(&data->lock);
 557                 break;
 558         case IIO_EV_DIR_FALLING:
 559                 mutex_lock(&data->lock);
 560                 *val = data->px_low_th;
 561                 mutex_unlock(&data->lock);
 562                 break;
 563         default:
 564                 return -EINVAL;
 565         }
 566
 567         return IIO_VAL_INT;
 568 }
 569
 570 static int us5182d_write_thresh(struct iio_dev *indio_dev,
 571         const struct iio_chan_spec *chan, enum iio_event_type type,
 572         enum iio_event_direction dir, enum iio_event_info info, int val,
 573         int val2)
 574 {
 575         struct us5182d_data *data = iio_priv(indio_dev);
 576         int ret;
 577
 578         if (val < 0 || val > USHRT_MAX || val2 != 0)
 579                 return -EINVAL;
 580
 581         switch (dir) {
 582         case IIO_EV_DIR_RISING:
 583                 mutex_lock(&data->lock);
 584                 if (data->rising_en) {
 585                         ret = us5182d_setup_prox(indio_dev, dir, val);
 586                         if (ret < 0)
 587                                 goto err;
 588                 }
 589                 data->px_high_th = val;
 590                 mutex_unlock(&data->lock);
 591                 break;
 592         case IIO_EV_DIR_FALLING:
 593                 mutex_lock(&data->lock);
 594                 if (data->falling_en) {
 595                         ret = us5182d_setup_prox(indio_dev, dir, val);
 596                         if (ret < 0)
 597                                 goto err;
 598                 }
 599                 data->px_low_th = val;
 600                 mutex_unlock(&data->lock);
 601                 break;
 602         default:
 603                 return -EINVAL;
 604         }
 605
 606         return 0;
 607 err:
 608         mutex_unlock(&data->lock);
 609         return ret;
 610 }
 611
 612 static int us5182d_read_event_config(struct iio_dev *indio_dev,
 613         const struct iio_chan_spec *chan, enum iio_event_type type,
 614         enum iio_event_direction dir)
 615 {
 616         struct us5182d_data *data = iio_priv(indio_dev);
 617         int ret;
 618
 619         switch (dir) {
 620         case IIO_EV_DIR_RISING:
 621                 mutex_lock(&data->lock);
 622                 ret = data->rising_en;
 623                 mutex_unlock(&data->lock);
 624                 break;
 625         case IIO_EV_DIR_FALLING:
 626                 mutex_lock(&data->lock);
 627                 ret = data->falling_en;
 628                 mutex_unlock(&data->lock);
 629                 break;
 630         default:
 631                 ret = -EINVAL;
 632                 break;
 633         }
 634
 635         return ret;
 636 }
 637
 638 static int us5182d_write_event_config(struct iio_dev *indio_dev,
 639         const struct iio_chan_spec *chan, enum iio_event_type type,
 640         enum iio_event_direction dir, int state)
 641 {
 642         struct us5182d_data *data = iio_priv(indio_dev);
 643         int ret;
 644         u16 new_th;
 645
 646         mutex_lock(&data->lock);
 647
 648         switch (dir) {
 649         case IIO_EV_DIR_RISING:
 650                 if (data->rising_en == state) {
 651                         mutex_unlock(&data->lock);
 652                         return 0;
 653                 }
 654                 new_th = US5182D_PXH_TH_DISABLE;
 655                 if (state) {
 656                         data->power_mode = US5182D_CONTINUOUS;
 657                         ret = us5182d_set_power_state(data, true);
 658                         if (ret < 0)
 659                                 goto err;
 660                         ret = us5182d_px_enable(data);
 661                         if (ret < 0)
 662                                 goto err_poweroff;
 663                         new_th = data->px_high_th;
 664                 }
 665                 ret = us5182d_setup_prox(indio_dev, dir, new_th);
 666                 if (ret < 0)
 667                         goto err_poweroff;
 668                 data->rising_en = state;
 669                 break;
 670         case IIO_EV_DIR_FALLING:
 671                 if (data->falling_en == state) {
 672                         mutex_unlock(&data->lock);
 673                         return 0;
 674                 }
 675                 new_th =  US5182D_PXL_TH_DISABLE;
 676                 if (state) {
 677                         data->power_mode = US5182D_CONTINUOUS;
 678                         ret = us5182d_set_power_state(data, true);
 679                         if (ret < 0)
 680                                 goto err;
 681                         ret = us5182d_px_enable(data);
 682                         if (ret < 0)
 683                                 goto err_poweroff;
 684                         new_th = data->px_low_th;
 685                 }
 686                 ret = us5182d_setup_prox(indio_dev, dir, new_th);
 687                 if (ret < 0)
 688                         goto err_poweroff;
 689                 data->falling_en = state;
 690                 break;
 691         default:
 692                 ret = -EINVAL;
 693                 goto err;
 694         }
 695
 696         if (!state) {
 697                 ret = us5182d_set_power_state(data, false);
 698                 if (ret < 0)
 699                         goto err;
 700         }
 701
 702         if (!data->falling_en && !data->rising_en && !data->default_continuous)
 703                 data->power_mode = US5182D_ONESHOT;
 704
 705         mutex_unlock(&data->lock);
 706         return 0;
 707
 708 err_poweroff:
 709         if (state)
 710                 us5182d_set_power_state(data, false);
 711 err:
 712         mutex_unlock(&data->lock);
 713         return ret;
 714 }
 715
 716 static const struct iio_info us5182d_info = {
 717         .driver_module  = THIS_MODULE,
 718         .read_raw = us5182d_read_raw,
 719         .write_raw = us5182d_write_raw,
 720         .attrs = &us5182d_attr_group,
 721         .read_event_value = &us5182d_read_thresh,
 722         .write_event_value = &us5182d_write_thresh,
 723         .read_event_config = &us5182d_read_event_config,
 724         .write_event_config = &us5182d_write_event_config,
 725 };
 726
 727 static int us5182d_reset(struct iio_dev *indio_dev)
 728 {
 729         struct us5182d_data *data = iio_priv(indio_dev);
 730
 731         return i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG3,
 732                                          US5182D_RESET_CHIP);
 733 }
 734
 735 static int us5182d_init(struct iio_dev *indio_dev)
 736 {
 737         struct us5182d_data *data = iio_priv(indio_dev);
 738         int i, ret;
 739
 740         ret = us5182d_reset(indio_dev);
 741         if (ret < 0)
 742                 return ret;
 743
 744         data->opmode = 0;
 745         data->power_mode = US5182D_CONTINUOUS;
 746         data->px_low_th = US5182D_REG_PXL_TH_DEFAULT;
 747         data->px_high_th = US5182D_REG_PXH_TH_DEFAULT;
 748
 749         for (i = 0; i < ARRAY_SIZE(us5182d_regvals); i++) {
 750                 ret = i2c_smbus_write_byte_data(data->client,
 751                                                 us5182d_regvals[i].reg,
 752                                                 us5182d_regvals[i].val);
 753                 if (ret < 0)
 754                         return ret;
 755         }
 756
 757         data->als_enabled = true;
 758         data->px_enabled = true;
 759
 760         if (!data->default_continuous) {
 761                 ret = us5182d_shutdown_en(data, US5182D_CFG0_SHUTDOWN_EN);
 762                 if (ret < 0)
 763                         return ret;
 764                 data->power_mode = US5182D_ONESHOT;
 765         }
 766
 767         return ret;
 768 }
 769
 770 static void us5182d_get_platform_data(struct iio_dev *indio_dev)
 771 {
 772         struct us5182d_data *data = iio_priv(indio_dev);
 773
 774         if (device_property_read_u32(&data->client->dev, "upisemi,glass-coef",
 775                                      &data->ga))
 776                 data->ga = US5182D_GA_RESOLUTION;
 777         if (device_property_read_u16_array(&data->client->dev,
 778                                            "upisemi,dark-ths",
 779                                            data->us5182d_dark_ths,
 780                                            ARRAY_SIZE(us5182d_dark_ths_vals)))
 781                 data->us5182d_dark_ths = us5182d_dark_ths_vals;
 782         if (device_property_read_u8(&data->client->dev,
 783                                     "upisemi,upper-dark-gain",
 784                                     &data->upper_dark_gain))
 785                 data->upper_dark_gain = US5182D_REG_AUTO_HDARK_GAIN_DEFAULT;
 786         if (device_property_read_u8(&data->client->dev,
 787                                     "upisemi,lower-dark-gain",
 788                                     &data->lower_dark_gain))
 789                 data->lower_dark_gain = US5182D_REG_AUTO_LDARK_GAIN_DEFAULT;
 790         data->default_continuous = device_property_read_bool(&data->client->dev,
 791                                                              "upisemi,continuous");
 792 }
 793
 794 static int  us5182d_dark_gain_config(struct iio_dev *indio_dev)
 795 {
 796         struct us5182d_data *data = iio_priv(indio_dev);
 797         int ret;
 798
 799         ret = us5182d_update_dark_th(data, US5182D_CFG1_AGAIN_DEFAULT);
 800         if (ret < 0)
 801                 return ret;
 802
 803         ret = i2c_smbus_write_byte_data(data->client,
 804                                         US5182D_REG_AUTO_LDARK_GAIN,
 805                                         data->lower_dark_gain);
 806         if (ret < 0)
 807                 return ret;
 808
 809         ret = i2c_smbus_write_byte_data(data->client,
 810                                         US5182D_REG_AUTO_HDARK_GAIN,
 811                                         data->upper_dark_gain);
 812         if (ret < 0)
 813                 return ret;
 814
 815         return i2c_smbus_write_byte_data(data->client, US5182D_REG_DARK_AUTO_EN,
 816                                          US5182D_REG_DARK_AUTO_EN_DEFAULT);
 817 }
 818
 819 static irqreturn_t us5182d_irq_thread_handler(int irq, void *private)
 820 {
 821         struct iio_dev *indio_dev = private;
 822         struct us5182d_data *data = iio_priv(indio_dev);
 823         enum iio_event_direction dir;
 824         int ret;
 825         u64 ev;
 826
 827         ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG0);
 828         if (ret < 0) {
 829                 dev_err(&data->client->dev, "i2c transfer error in irq\n");
 830                 return IRQ_HANDLED;
 831         }
 832
 833         dir = ret & US5182D_CFG0_PROX ? IIO_EV_DIR_RISING : IIO_EV_DIR_FALLING;
 834         ev = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 1, IIO_EV_TYPE_THRESH, dir);
 835
 836         iio_push_event(indio_dev, ev, iio_get_time_ns());
 837
 838         ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG0,
 839                                         ret & ~US5182D_CFG0_PX_IRQ);
 840         if (ret < 0)
 841                 dev_err(&data->client->dev, "i2c transfer error in irq\n");
 842
 843         return IRQ_HANDLED;
 844 }
 845
 846 static int us5182d_probe(struct i2c_client *client,
 847                          const struct i2c_device_id *id)
 848 {
 849         struct us5182d_data *data;
 850         struct iio_dev *indio_dev;
 851         int ret;
 852
 853         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 854         if (!indio_dev)
 855                 return -ENOMEM;
 856
 857         data = iio_priv(indio_dev);
 858         i2c_set_clientdata(client, indio_dev);
 859         data->client = client;
 860
 861         mutex_init(&data->lock);
 862
 863         indio_dev->dev.parent = &client->dev;
 864         indio_dev->info = &us5182d_info;
 865         indio_dev->name = US5182D_DRV_NAME;
 866         indio_dev->channels = us5182d_channels;
 867         indio_dev->num_channels = ARRAY_SIZE(us5182d_channels);
 868         indio_dev->modes = INDIO_DIRECT_MODE;
 869
 870         ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CHIPID);
 871         if (ret != US5182D_CHIPID) {
 872                 dev_err(&data->client->dev,
 873                         "Failed to detect US5182 light chip\n");
 874                 return (ret < 0) ? ret : -ENODEV;
 875         }
 876
 877         if (client->irq > 0) {
 878                 ret = devm_request_threaded_irq(&client->dev, client->irq, NULL,
 879                                                 us5182d_irq_thread_handler,
 880                                                 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 881                                                 "us5182d-irq", indio_dev);
 882                 if (ret < 0)
 883                         return ret;
 884         } else
 885                 dev_warn(&client->dev, "no valid irq found\n");
 886
 887         us5182d_get_platform_data(indio_dev);
 888         ret = us5182d_init(indio_dev);
 889         if (ret < 0)
 890                 return ret;
 891
 892         ret = us5182d_dark_gain_config(indio_dev);
 893         if (ret < 0)
 894                 goto out_err;
 895
 896         if (data->default_continuous) {
 897                 pm_runtime_set_active(&client->dev);
 898                 if (ret < 0)
 899                         goto out_err;
 900         }
 901
 902         pm_runtime_enable(&client->dev);
 903         pm_runtime_set_autosuspend_delay(&client->dev,
 904                                          US5182D_SLEEP_MS);
 905         pm_runtime_use_autosuspend(&client->dev);
 906
 907         ret = iio_device_register(indio_dev);
 908         if (ret < 0)
 909                 goto out_err;
 910
 911         return 0;
 912
 913 out_err:
 914         us5182d_shutdown_en(data, US5182D_CFG0_SHUTDOWN_EN);
 915         return ret;
 916
 917 }
 918
 919 static int us5182d_remove(struct i2c_client *client)
 920 {
 921         struct us5182d_data *data = iio_priv(i2c_get_clientdata(client));
 922
 923         iio_device_unregister(i2c_get_clientdata(client));
 924
 925         pm_runtime_disable(&client->dev);
 926         pm_runtime_set_suspended(&client->dev);
 927
 928         return us5182d_shutdown_en(data, US5182D_CFG0_SHUTDOWN_EN);
 929 }
 930
 931 #if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM)
 932 static int us5182d_suspend(struct device *dev)
 933 {
 934         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 935         struct us5182d_data *data = iio_priv(indio_dev);
 936
 937         if (data->power_mode == US5182D_CONTINUOUS)
 938                 return us5182d_shutdown_en(data, US5182D_CFG0_SHUTDOWN_EN);
 939
 940         return 0;
 941 }
 942
 943 static int us5182d_resume(struct device *dev)
 944 {
 945         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 946         struct us5182d_data *data = iio_priv(indio_dev);
 947
 948         if (data->power_mode == US5182D_CONTINUOUS)
 949                 return us5182d_shutdown_en(data,
 950                                            ~US5182D_CFG0_SHUTDOWN_EN & 0xff);
 951
 952         return 0;
 953 }
 954 #endif
 955
 956 static const struct dev_pm_ops us5182d_pm_ops = {
 957         SET_SYSTEM_SLEEP_PM_OPS(us5182d_suspend, us5182d_resume)
 958         SET_RUNTIME_PM_OPS(us5182d_suspend, us5182d_resume, NULL)
 959 };
 960
 961 static const struct acpi_device_id us5182d_acpi_match[] = {
 962         { "USD5182", 0},
 963         {}
 964 };
 965
 966 MODULE_DEVICE_TABLE(acpi, us5182d_acpi_match);
 967
 968 static const struct i2c_device_id us5182d_id[] = {
 969                 {"usd5182", 0},
 970                 {}
 971 };
 972
 973 MODULE_DEVICE_TABLE(i2c, us5182d_id);
 974
 975 static struct i2c_driver us5182d_driver = {
 976         .driver = {
 977                 .name = US5182D_DRV_NAME,
 978                 .pm = &us5182d_pm_ops,
 979                 .acpi_match_table = ACPI_PTR(us5182d_acpi_match),
 980         },
 981         .probe = us5182d_probe,
 982         .remove = us5182d_remove,
 983         .id_table = us5182d_id,
 984
 985 };
 986 module_i2c_driver(us5182d_driver);
 987
 988 MODULE_AUTHOR("Adriana Reus <adriana.reus@intel.com>");
 989 MODULE_DESCRIPTION("Driver for us5182d Proximity and Light Sensor");
 990 MODULE_LICENSE("GPL v2");