drivers/iio/light/tsl2563.c

   1 /*
   2  * drivers/iio/light/tsl2563.c
   3  *
   4  * Copyright (C) 2008 Nokia Corporation
   5  *
   6  * Written by Timo O. Karjalainen <timo.o.karjalainen@nokia.com>
   7  * Contact: Amit Kucheria <amit.kucheria@verdurent.com>
   8  *
   9  * Converted to IIO driver
  10  * Amit Kucheria <amit.kucheria@verdurent.com>
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * version 2 as published by the Free Software Foundation.
  15  *
  16  * This program is distributed in the hope that it will be useful, but
  17  * WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  24  * 02110-1301 USA
  25  */
  26
  27 #include <linux/module.h>
  28 #include <linux/i2c.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/irq.h>
  31 #include <linux/sched.h>
  32 #include <linux/mutex.h>
  33 #include <linux/delay.h>
  34 #include <linux/pm.h>
  35 #include <linux/err.h>
  36 #include <linux/slab.h>
  37
  38 #include <linux/iio/iio.h>
  39 #include <linux/iio/sysfs.h>
  40 #include <linux/iio/events.h>
  41 #include <linux/platform_data/tsl2563.h>
  42
  43 /* Use this many bits for fraction part. */
  44 #define ADC_FRAC_BITS           14
  45
  46 /* Given number of 1/10000's in ADC_FRAC_BITS precision. */
  47 #define FRAC10K(f)              (((f) * (1L << (ADC_FRAC_BITS))) / (10000))
  48
  49 /* Bits used for fraction in calibration coefficients.*/
  50 #define CALIB_FRAC_BITS         10
  51 /* 0.5 in CALIB_FRAC_BITS precision */
  52 #define CALIB_FRAC_HALF         (1 << (CALIB_FRAC_BITS - 1))
  53 /* Make a fraction from a number n that was multiplied with b. */
  54 #define CALIB_FRAC(n, b)        (((n) << CALIB_FRAC_BITS) / (b))
  55 /* Decimal 10^(digits in sysfs presentation) */
  56 #define CALIB_BASE_SYSFS        1000
  57
  58 #define TSL2563_CMD             0x80
  59 #define TSL2563_CLEARINT        0x40
  60
  61 #define TSL2563_REG_CTRL        0x00
  62 #define TSL2563_REG_TIMING      0x01
  63 #define TSL2563_REG_LOWLOW      0x02 /* data0 low threshold, 2 bytes */
  64 #define TSL2563_REG_LOWHIGH     0x03
  65 #define TSL2563_REG_HIGHLOW     0x04 /* data0 high threshold, 2 bytes */
  66 #define TSL2563_REG_HIGHHIGH    0x05
  67 #define TSL2563_REG_INT         0x06
  68 #define TSL2563_REG_ID          0x0a
  69 #define TSL2563_REG_DATA0LOW    0x0c /* broadband sensor value, 2 bytes */
  70 #define TSL2563_REG_DATA0HIGH   0x0d
  71 #define TSL2563_REG_DATA1LOW    0x0e /* infrared sensor value, 2 bytes */
  72 #define TSL2563_REG_DATA1HIGH   0x0f
  73
  74 #define TSL2563_CMD_POWER_ON    0x03
  75 #define TSL2563_CMD_POWER_OFF   0x00
  76 #define TSL2563_CTRL_POWER_MASK 0x03
  77
  78 #define TSL2563_TIMING_13MS     0x00
  79 #define TSL2563_TIMING_100MS    0x01
  80 #define TSL2563_TIMING_400MS    0x02
  81 #define TSL2563_TIMING_MASK     0x03
  82 #define TSL2563_TIMING_GAIN16   0x10
  83 #define TSL2563_TIMING_GAIN1    0x00
  84
  85 #define TSL2563_INT_DISBLED     0x00
  86 #define TSL2563_INT_LEVEL       0x10
  87 #define TSL2563_INT_PERSIST(n)  ((n) & 0x0F)
  88
  89 struct tsl2563_gainlevel_coeff {
  90         u8 gaintime;
  91         u16 min;
  92         u16 max;
  93 };
  94
  95 static const struct tsl2563_gainlevel_coeff tsl2563_gainlevel_table[] = {
  96         {
  97                 .gaintime       = TSL2563_TIMING_400MS | TSL2563_TIMING_GAIN16,
  98                 .min            = 0,
  99                 .max            = 65534,
 100         }, {
 101                 .gaintime       = TSL2563_TIMING_400MS | TSL2563_TIMING_GAIN1,
 102                 .min            = 2048,
 103                 .max            = 65534,
 104         }, {
 105                 .gaintime       = TSL2563_TIMING_100MS | TSL2563_TIMING_GAIN1,
 106                 .min            = 4095,
 107                 .max            = 37177,
 108         }, {
 109                 .gaintime       = TSL2563_TIMING_13MS | TSL2563_TIMING_GAIN1,
 110                 .min            = 3000,
 111                 .max            = 65535,
 112         },
 113 };
 114
 115 struct tsl2563_chip {
 116         struct mutex            lock;
 117         struct i2c_client       *client;
 118         struct delayed_work     poweroff_work;
 119
 120         /* Remember state for suspend and resume functions */
 121         bool suspended;
 122
 123         struct tsl2563_gainlevel_coeff const *gainlevel;
 124
 125         u16                     low_thres;
 126         u16                     high_thres;
 127         u8                      intr;
 128         bool                    int_enabled;
 129
 130         /* Calibration coefficients */
 131         u32                     calib0;
 132         u32                     calib1;
 133         int                     cover_comp_gain;
 134
 135         /* Cache current values, to be returned while suspended */
 136         u32                     data0;
 137         u32                     data1;
 138 };
 139
 140 static int tsl2563_set_power(struct tsl2563_chip *chip, int on)
 141 {
 142         struct i2c_client *client = chip->client;
 143         u8 cmd;
 144
 145         cmd = on ? TSL2563_CMD_POWER_ON : TSL2563_CMD_POWER_OFF;
 146         return i2c_smbus_write_byte_data(client,
 147                                          TSL2563_CMD | TSL2563_REG_CTRL, cmd);
 148 }
 149
 150 /*
 151  * Return value is 0 for off, 1 for on, or a negative error
 152  * code if reading failed.
 153  */
 154 static int tsl2563_get_power(struct tsl2563_chip *chip)
 155 {
 156         struct i2c_client *client = chip->client;
 157         int ret;
 158
 159         ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_CTRL);
 160         if (ret < 0)
 161                 return ret;
 162
 163         return (ret & TSL2563_CTRL_POWER_MASK) == TSL2563_CMD_POWER_ON;
 164 }
 165
 166 static int tsl2563_configure(struct tsl2563_chip *chip)
 167 {
 168         int ret;
 169
 170         ret = i2c_smbus_write_byte_data(chip->client,
 171                         TSL2563_CMD | TSL2563_REG_TIMING,
 172                         chip->gainlevel->gaintime);
 173         if (ret)
 174                 goto error_ret;
 175         ret = i2c_smbus_write_byte_data(chip->client,
 176                         TSL2563_CMD | TSL2563_REG_HIGHLOW,
 177                         chip->high_thres & 0xFF);
 178         if (ret)
 179                 goto error_ret;
 180         ret = i2c_smbus_write_byte_data(chip->client,
 181                         TSL2563_CMD | TSL2563_REG_HIGHHIGH,
 182                         (chip->high_thres >> 8) & 0xFF);
 183         if (ret)
 184                 goto error_ret;
 185         ret = i2c_smbus_write_byte_data(chip->client,
 186                         TSL2563_CMD | TSL2563_REG_LOWLOW,
 187                         chip->low_thres & 0xFF);
 188         if (ret)
 189                 goto error_ret;
 190         ret = i2c_smbus_write_byte_data(chip->client,
 191                         TSL2563_CMD | TSL2563_REG_LOWHIGH,
 192                         (chip->low_thres >> 8) & 0xFF);
 193 /*
 194  * Interrupt register is automatically written anyway if it is relevant
 195  * so is not here.
 196  */
 197 error_ret:
 198         return ret;
 199 }
 200
 201 static void tsl2563_poweroff_work(struct work_struct *work)
 202 {
 203         struct tsl2563_chip *chip =
 204                 container_of(work, struct tsl2563_chip, poweroff_work.work);
 205         tsl2563_set_power(chip, 0);
 206 }
 207
 208 static int tsl2563_detect(struct tsl2563_chip *chip)
 209 {
 210         int ret;
 211
 212         ret = tsl2563_set_power(chip, 1);
 213         if (ret)
 214                 return ret;
 215
 216         ret = tsl2563_get_power(chip);
 217         if (ret < 0)
 218                 return ret;
 219
 220         return ret ? 0 : -ENODEV;
 221 }
 222
 223 static int tsl2563_read_id(struct tsl2563_chip *chip, u8 *id)
 224 {
 225         struct i2c_client *client = chip->client;
 226         int ret;
 227
 228         ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_ID);
 229         if (ret < 0)
 230                 return ret;
 231
 232         *id = ret;
 233
 234         return 0;
 235 }
 236
 237 /*
 238  * "Normalized" ADC value is one obtained with 400ms of integration time and
 239  * 16x gain. This function returns the number of bits of shift needed to
 240  * convert between normalized values and HW values obtained using given
 241  * timing and gain settings.
 242  */
 243 static int adc_shiftbits(u8 timing)
 244 {
 245         int shift = 0;
 246
 247         switch (timing & TSL2563_TIMING_MASK) {
 248         case TSL2563_TIMING_13MS:
 249                 shift += 5;
 250                 break;
 251         case TSL2563_TIMING_100MS:
 252                 shift += 2;
 253                 break;
 254         case TSL2563_TIMING_400MS:
 255                 /* no-op */
 256                 break;
 257         }
 258
 259         if (!(timing & TSL2563_TIMING_GAIN16))
 260                 shift += 4;
 261
 262         return shift;
 263 }
 264
 265 /* Convert a HW ADC value to normalized scale. */
 266 static u32 normalize_adc(u16 adc, u8 timing)
 267 {
 268         return adc << adc_shiftbits(timing);
 269 }
 270
 271 static void tsl2563_wait_adc(struct tsl2563_chip *chip)
 272 {
 273         unsigned int delay;
 274
 275         switch (chip->gainlevel->gaintime & TSL2563_TIMING_MASK) {
 276         case TSL2563_TIMING_13MS:
 277                 delay = 14;
 278                 break;
 279         case TSL2563_TIMING_100MS:
 280                 delay = 101;
 281                 break;
 282         default:
 283                 delay = 402;
 284         }
 285         /*
 286          * TODO: Make sure that we wait at least required delay but why we
 287          * have to extend it one tick more?
 288          */
 289         schedule_timeout_interruptible(msecs_to_jiffies(delay) + 2);
 290 }
 291
 292 static int tsl2563_adjust_gainlevel(struct tsl2563_chip *chip, u16 adc)
 293 {
 294         struct i2c_client *client = chip->client;
 295
 296         if (adc > chip->gainlevel->max || adc < chip->gainlevel->min) {
 297
 298                 (adc > chip->gainlevel->max) ?
 299                         chip->gainlevel++ : chip->gainlevel--;
 300
 301                 i2c_smbus_write_byte_data(client,
 302                                           TSL2563_CMD | TSL2563_REG_TIMING,
 303                                           chip->gainlevel->gaintime);
 304
 305                 tsl2563_wait_adc(chip);
 306                 tsl2563_wait_adc(chip);
 307
 308                 return 1;
 309         } else
 310                 return 0;
 311 }
 312
 313 static int tsl2563_get_adc(struct tsl2563_chip *chip)
 314 {
 315         struct i2c_client *client = chip->client;
 316         u16 adc0, adc1;
 317         int retry = 1;
 318         int ret = 0;
 319
 320         if (chip->suspended)
 321                 goto out;
 322
 323         if (!chip->int_enabled) {
 324                 cancel_delayed_work(&chip->poweroff_work);
 325
 326                 if (!tsl2563_get_power(chip)) {
 327                         ret = tsl2563_set_power(chip, 1);
 328                         if (ret)
 329                                 goto out;
 330                         ret = tsl2563_configure(chip);
 331                         if (ret)
 332                                 goto out;
 333                         tsl2563_wait_adc(chip);
 334                 }
 335         }
 336
 337         while (retry) {
 338                 ret = i2c_smbus_read_word_data(client,
 339                                 TSL2563_CMD | TSL2563_REG_DATA0LOW);
 340                 if (ret < 0)
 341                         goto out;
 342                 adc0 = ret;
 343
 344                 ret = i2c_smbus_read_word_data(client,
 345                                 TSL2563_CMD | TSL2563_REG_DATA1LOW);
 346                 if (ret < 0)
 347                         goto out;
 348                 adc1 = ret;
 349
 350                 retry = tsl2563_adjust_gainlevel(chip, adc0);
 351         }
 352
 353         chip->data0 = normalize_adc(adc0, chip->gainlevel->gaintime);
 354         chip->data1 = normalize_adc(adc1, chip->gainlevel->gaintime);
 355
 356         if (!chip->int_enabled)
 357                 schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
 358
 359         ret = 0;
 360 out:
 361         return ret;
 362 }
 363
 364 static inline int calib_to_sysfs(u32 calib)
 365 {
 366         return (int) (((calib * CALIB_BASE_SYSFS) +
 367                        CALIB_FRAC_HALF) >> CALIB_FRAC_BITS);
 368 }
 369
 370 static inline u32 calib_from_sysfs(int value)
 371 {
 372         return (((u32) value) << CALIB_FRAC_BITS) / CALIB_BASE_SYSFS;
 373 }
 374
 375 /*
 376  * Conversions between lux and ADC values.
 377  *
 378  * The basic formula is lux = c0 * adc0 - c1 * adc1, where c0 and c1 are
 379  * appropriate constants. Different constants are needed for different
 380  * kinds of light, determined by the ratio adc1/adc0 (basically the ratio
 381  * of the intensities in infrared and visible wavelengths). lux_table below
 382  * lists the upper threshold of the adc1/adc0 ratio and the corresponding
 383  * constants.
 384  */
 385
 386 struct tsl2563_lux_coeff {
 387         unsigned long ch_ratio;
 388         unsigned long ch0_coeff;
 389         unsigned long ch1_coeff;
 390 };
 391
 392 static const struct tsl2563_lux_coeff lux_table[] = {
 393         {
 394                 .ch_ratio       = FRAC10K(1300),
 395                 .ch0_coeff      = FRAC10K(315),
 396                 .ch1_coeff      = FRAC10K(262),
 397         }, {
 398                 .ch_ratio       = FRAC10K(2600),
 399                 .ch0_coeff      = FRAC10K(337),
 400                 .ch1_coeff      = FRAC10K(430),
 401         }, {
 402                 .ch_ratio       = FRAC10K(3900),
 403                 .ch0_coeff      = FRAC10K(363),
 404                 .ch1_coeff      = FRAC10K(529),
 405         }, {
 406                 .ch_ratio       = FRAC10K(5200),
 407                 .ch0_coeff      = FRAC10K(392),
 408                 .ch1_coeff      = FRAC10K(605),
 409         }, {
 410                 .ch_ratio       = FRAC10K(6500),
 411                 .ch0_coeff      = FRAC10K(229),
 412                 .ch1_coeff      = FRAC10K(291),
 413         }, {
 414                 .ch_ratio       = FRAC10K(8000),
 415                 .ch0_coeff      = FRAC10K(157),
 416                 .ch1_coeff      = FRAC10K(180),
 417         }, {
 418                 .ch_ratio       = FRAC10K(13000),
 419                 .ch0_coeff      = FRAC10K(34),
 420                 .ch1_coeff      = FRAC10K(26),
 421         }, {
 422                 .ch_ratio       = ULONG_MAX,
 423                 .ch0_coeff      = 0,
 424                 .ch1_coeff      = 0,
 425         },
 426 };
 427
 428 /* Convert normalized, scaled ADC values to lux. */
 429 static unsigned int adc_to_lux(u32 adc0, u32 adc1)
 430 {
 431         const struct tsl2563_lux_coeff *lp = lux_table;
 432         unsigned long ratio, lux, ch0 = adc0, ch1 = adc1;
 433
 434         ratio = ch0 ? ((ch1 << ADC_FRAC_BITS) / ch0) : ULONG_MAX;
 435
 436         while (lp->ch_ratio < ratio)
 437                 lp++;
 438
 439         lux = ch0 * lp->ch0_coeff - ch1 * lp->ch1_coeff;
 440
 441         return (unsigned int) (lux >> ADC_FRAC_BITS);
 442 }
 443
 444 /* Apply calibration coefficient to ADC count. */
 445 static u32 calib_adc(u32 adc, u32 calib)
 446 {
 447         unsigned long scaled = adc;
 448
 449         scaled *= calib;
 450         scaled >>= CALIB_FRAC_BITS;
 451
 452         return (u32) scaled;
 453 }
 454
 455 static int tsl2563_write_raw(struct iio_dev *indio_dev,
 456                                struct iio_chan_spec const *chan,
 457                                int val,
 458                                int val2,
 459                                long mask)
 460 {
 461         struct tsl2563_chip *chip = iio_priv(indio_dev);
 462
 463         if (chan->channel == IIO_MOD_LIGHT_BOTH)
 464                 chip->calib0 = calib_from_sysfs(val);
 465         else
 466                 chip->calib1 = calib_from_sysfs(val);
 467
 468         return 0;
 469 }
 470
 471 static int tsl2563_read_raw(struct iio_dev *indio_dev,
 472                             struct iio_chan_spec const *chan,
 473                             int *val,
 474                             int *val2,
 475                             long m)
 476 {
 477         int ret = -EINVAL;
 478         u32 calib0, calib1;
 479         struct tsl2563_chip *chip = iio_priv(indio_dev);
 480
 481         mutex_lock(&chip->lock);
 482         switch (m) {
 483         case IIO_CHAN_INFO_RAW:
 484         case IIO_CHAN_INFO_PROCESSED:
 485                 switch (chan->type) {
 486                 case IIO_LIGHT:
 487                         ret = tsl2563_get_adc(chip);
 488                         if (ret)
 489                                 goto error_ret;
 490                         calib0 = calib_adc(chip->data0, chip->calib0) *
 491                                 chip->cover_comp_gain;
 492                         calib1 = calib_adc(chip->data1, chip->calib1) *
 493                                 chip->cover_comp_gain;
 494                         *val = adc_to_lux(calib0, calib1);
 495                         ret = IIO_VAL_INT;
 496                         break;
 497                 case IIO_INTENSITY:
 498                         ret = tsl2563_get_adc(chip);
 499                         if (ret)
 500                                 goto error_ret;
 501                         if (chan->channel == 0)
 502                                 *val = chip->data0;
 503                         else
 504                                 *val = chip->data1;
 505                         ret = IIO_VAL_INT;
 506                         break;
 507                 default:
 508                         break;
 509                 }
 510                 break;
 511
 512         case IIO_CHAN_INFO_CALIBSCALE:
 513                 if (chan->channel == 0)
 514                         *val = calib_to_sysfs(chip->calib0);
 515                 else
 516                         *val = calib_to_sysfs(chip->calib1);
 517                 ret = IIO_VAL_INT;
 518                 break;
 519         default:
 520                 ret = -EINVAL;
 521                 goto error_ret;
 522         }
 523
 524 error_ret:
 525         mutex_unlock(&chip->lock);
 526         return ret;
 527 }
 528
 529 static const struct iio_event_spec tsl2563_events[] = {
 530         {
 531                 .type = IIO_EV_TYPE_THRESH,
 532                 .dir = IIO_EV_DIR_RISING,
 533                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 534                                 BIT(IIO_EV_INFO_ENABLE),
 535         }, {
 536                 .type = IIO_EV_TYPE_THRESH,
 537                 .dir = IIO_EV_DIR_FALLING,
 538                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 539                                 BIT(IIO_EV_INFO_ENABLE),
 540         },
 541 };
 542
 543 static const struct iio_chan_spec tsl2563_channels[] = {
 544         {
 545                 .type = IIO_LIGHT,
 546                 .indexed = 1,
 547                 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
 548                 .channel = 0,
 549         }, {
 550                 .type = IIO_INTENSITY,
 551                 .modified = 1,
 552                 .channel2 = IIO_MOD_LIGHT_BOTH,
 553                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 554                 BIT(IIO_CHAN_INFO_CALIBSCALE),
 555                 .event_spec = tsl2563_events,
 556                 .num_event_specs = ARRAY_SIZE(tsl2563_events),
 557         }, {
 558                 .type = IIO_INTENSITY,
 559                 .modified = 1,
 560                 .channel2 = IIO_MOD_LIGHT_IR,
 561                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 562                 BIT(IIO_CHAN_INFO_CALIBSCALE),
 563         }
 564 };
 565
 566 static int tsl2563_read_thresh(struct iio_dev *indio_dev,
 567         const struct iio_chan_spec *chan, enum iio_event_type type,
 568         enum iio_event_direction dir, enum iio_event_info info, int *val,
 569         int *val2)
 570 {
 571         struct tsl2563_chip *chip = iio_priv(indio_dev);
 572
 573         switch (dir) {
 574         case IIO_EV_DIR_RISING:
 575                 *val = chip->high_thres;
 576                 break;
 577         case IIO_EV_DIR_FALLING:
 578                 *val = chip->low_thres;
 579                 break;
 580         default:
 581                 return -EINVAL;
 582         }
 583
 584         return IIO_VAL_INT;
 585 }
 586
 587 static int tsl2563_write_thresh(struct iio_dev *indio_dev,
 588         const struct iio_chan_spec *chan, enum iio_event_type type,
 589         enum iio_event_direction dir, enum iio_event_info info, int val,
 590         int val2)
 591 {
 592         struct tsl2563_chip *chip = iio_priv(indio_dev);
 593         int ret;
 594         u8 address;
 595
 596         if (dir == IIO_EV_DIR_RISING)
 597                 address = TSL2563_REG_HIGHLOW;
 598         else
 599                 address = TSL2563_REG_LOWLOW;
 600         mutex_lock(&chip->lock);
 601         ret = i2c_smbus_write_byte_data(chip->client, TSL2563_CMD | address,
 602                                         val & 0xFF);
 603         if (ret)
 604                 goto error_ret;
 605         ret = i2c_smbus_write_byte_data(chip->client,
 606                                         TSL2563_CMD | (address + 1),
 607                                         (val >> 8) & 0xFF);
 608         if (dir == IIO_EV_DIR_RISING)
 609                 chip->high_thres = val;
 610         else
 611                 chip->low_thres = val;
 612
 613 error_ret:
 614         mutex_unlock(&chip->lock);
 615
 616         return ret;
 617 }
 618
 619 static irqreturn_t tsl2563_event_handler(int irq, void *private)
 620 {
 621         struct iio_dev *dev_info = private;
 622         struct tsl2563_chip *chip = iio_priv(dev_info);
 623
 624         iio_push_event(dev_info,
 625                        IIO_UNMOD_EVENT_CODE(IIO_LIGHT,
 626                                             0,
 627                                             IIO_EV_TYPE_THRESH,
 628                                             IIO_EV_DIR_EITHER),
 629                        iio_get_time_ns());
 630
 631         /* clear the interrupt and push the event */
 632         i2c_smbus_write_byte(chip->client, TSL2563_CMD | TSL2563_CLEARINT);
 633         return IRQ_HANDLED;
 634 }
 635
 636 static int tsl2563_write_interrupt_config(struct iio_dev *indio_dev,
 637         const struct iio_chan_spec *chan, enum iio_event_type type,
 638         enum iio_event_direction dir, int state)
 639 {
 640         struct tsl2563_chip *chip = iio_priv(indio_dev);
 641         int ret = 0;
 642
 643         mutex_lock(&chip->lock);
 644         if (state && !(chip->intr & 0x30)) {
 645                 chip->intr &= ~0x30;
 646                 chip->intr |= 0x10;
 647                 /* ensure the chip is actually on */
 648                 cancel_delayed_work(&chip->poweroff_work);
 649                 if (!tsl2563_get_power(chip)) {
 650                         ret = tsl2563_set_power(chip, 1);
 651                         if (ret)
 652                                 goto out;
 653                         ret = tsl2563_configure(chip);
 654                         if (ret)
 655                                 goto out;
 656                 }
 657                 ret = i2c_smbus_write_byte_data(chip->client,
 658                                                 TSL2563_CMD | TSL2563_REG_INT,
 659                                                 chip->intr);
 660                 chip->int_enabled = true;
 661         }
 662
 663         if (!state && (chip->intr & 0x30)) {
 664                 chip->intr &= ~0x30;
 665                 ret = i2c_smbus_write_byte_data(chip->client,
 666                                                 TSL2563_CMD | TSL2563_REG_INT,
 667                                                 chip->intr);
 668                 chip->int_enabled = false;
 669                 /* now the interrupt is not enabled, we can go to sleep */
 670                 schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
 671         }
 672 out:
 673         mutex_unlock(&chip->lock);
 674
 675         return ret;
 676 }
 677
 678 static int tsl2563_read_interrupt_config(struct iio_dev *indio_dev,
 679         const struct iio_chan_spec *chan, enum iio_event_type type,
 680         enum iio_event_direction dir)
 681 {
 682         struct tsl2563_chip *chip = iio_priv(indio_dev);
 683         int ret;
 684
 685         mutex_lock(&chip->lock);
 686         ret = i2c_smbus_read_byte_data(chip->client,
 687                                        TSL2563_CMD | TSL2563_REG_INT);
 688         mutex_unlock(&chip->lock);
 689         if (ret < 0)
 690                 return ret;
 691
 692         return !!(ret & 0x30);
 693 }
 694
 695 static const struct iio_info tsl2563_info_no_irq = {
 696         .driver_module = THIS_MODULE,
 697         .read_raw = &tsl2563_read_raw,
 698         .write_raw = &tsl2563_write_raw,
 699 };
 700
 701 static const struct iio_info tsl2563_info = {
 702         .driver_module = THIS_MODULE,
 703         .read_raw = &tsl2563_read_raw,
 704         .write_raw = &tsl2563_write_raw,
 705         .read_event_value = &tsl2563_read_thresh,
 706         .write_event_value = &tsl2563_write_thresh,
 707         .read_event_config = &tsl2563_read_interrupt_config,
 708         .write_event_config = &tsl2563_write_interrupt_config,
 709 };
 710
 711 static int tsl2563_probe(struct i2c_client *client,
 712                                 const struct i2c_device_id *device_id)
 713 {
 714         struct iio_dev *indio_dev;
 715         struct tsl2563_chip *chip;
 716         struct tsl2563_platform_data *pdata = client->dev.platform_data;
 717         struct device_node *np = client->dev.of_node;
 718         int err = 0;
 719         u8 id = 0;
 720
 721         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
 722         if (!indio_dev)
 723                 return -ENOMEM;
 724
 725         chip = iio_priv(indio_dev);
 726
 727         i2c_set_clientdata(client, chip);
 728         chip->client = client;
 729
 730         err = tsl2563_detect(chip);
 731         if (err) {
 732                 dev_err(&client->dev, "detect error %d\n", -err);
 733                 return err;
 734         }
 735
 736         err = tsl2563_read_id(chip, &id);
 737         if (err) {
 738                 dev_err(&client->dev, "read id error %d\n", -err);
 739                 return err;
 740         }
 741
 742         mutex_init(&chip->lock);
 743
 744         /* Default values used until userspace says otherwise */
 745         chip->low_thres = 0x0;
 746         chip->high_thres = 0xffff;
 747         chip->gainlevel = tsl2563_gainlevel_table;
 748         chip->intr = TSL2563_INT_PERSIST(4);
 749         chip->calib0 = calib_from_sysfs(CALIB_BASE_SYSFS);
 750         chip->calib1 = calib_from_sysfs(CALIB_BASE_SYSFS);
 751
 752         if (pdata)
 753                 chip->cover_comp_gain = pdata->cover_comp_gain;
 754         else if (np)
 755                 of_property_read_u32(np, "amstaos,cover-comp-gain",
 756                                      &chip->cover_comp_gain);
 757         else
 758                 chip->cover_comp_gain = 1;
 759
 760         dev_info(&client->dev, "model %d, rev. %d\n", id >> 4, id & 0x0f);
 761         indio_dev->name = client->name;
 762         indio_dev->channels = tsl2563_channels;
 763         indio_dev->num_channels = ARRAY_SIZE(tsl2563_channels);
 764         indio_dev->dev.parent = &client->dev;
 765         indio_dev->modes = INDIO_DIRECT_MODE;
 766
 767         if (client->irq)
 768                 indio_dev->info = &tsl2563_info;
 769         else
 770                 indio_dev->info = &tsl2563_info_no_irq;
 771
 772         if (client->irq) {
 773                 err = devm_request_threaded_irq(&client->dev, client->irq,
 774                                            NULL,
 775                                            &tsl2563_event_handler,
 776                                            IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 777                                            "tsl2563_event",
 778                                            indio_dev);
 779                 if (err) {
 780                         dev_err(&client->dev, "irq request error %d\n", -err);
 781                         return err;
 782                 }
 783         }
 784
 785         err = tsl2563_configure(chip);
 786         if (err) {
 787                 dev_err(&client->dev, "configure error %d\n", -err);
 788                 return err;
 789         }
 790
 791         INIT_DELAYED_WORK(&chip->poweroff_work, tsl2563_poweroff_work);
 792
 793         /* The interrupt cannot yet be enabled so this is fine without lock */
 794         schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
 795
 796         err = iio_device_register(indio_dev);
 797         if (err) {
 798                 dev_err(&client->dev, "iio registration error %d\n", -err);
 799                 goto fail;
 800         }
 801
 802         return 0;
 803
 804 fail:
 805         cancel_delayed_work(&chip->poweroff_work);
 806         flush_scheduled_work();
 807         return err;
 808 }
 809
 810 static int tsl2563_remove(struct i2c_client *client)
 811 {
 812         struct tsl2563_chip *chip = i2c_get_clientdata(client);
 813         struct iio_dev *indio_dev = iio_priv_to_dev(chip);
 814
 815         iio_device_unregister(indio_dev);
 816         if (!chip->int_enabled)
 817                 cancel_delayed_work(&chip->poweroff_work);
 818         /* Ensure that interrupts are disabled - then flush any bottom halves */
 819         chip->intr &= ~0x30;
 820         i2c_smbus_write_byte_data(chip->client, TSL2563_CMD | TSL2563_REG_INT,
 821                                   chip->intr);
 822         flush_scheduled_work();
 823         tsl2563_set_power(chip, 0);
 824
 825         return 0;
 826 }
 827
 828 #ifdef CONFIG_PM_SLEEP
 829 static int tsl2563_suspend(struct device *dev)
 830 {
 831         struct tsl2563_chip *chip = i2c_get_clientdata(to_i2c_client(dev));
 832         int ret;
 833
 834         mutex_lock(&chip->lock);
 835
 836         ret = tsl2563_set_power(chip, 0);
 837         if (ret)
 838                 goto out;
 839
 840         chip->suspended = true;
 841
 842 out:
 843         mutex_unlock(&chip->lock);
 844         return ret;
 845 }
 846
 847 static int tsl2563_resume(struct device *dev)
 848 {
 849         struct tsl2563_chip *chip = i2c_get_clientdata(to_i2c_client(dev));
 850         int ret;
 851
 852         mutex_lock(&chip->lock);
 853
 854         ret = tsl2563_set_power(chip, 1);
 855         if (ret)
 856                 goto out;
 857
 858         ret = tsl2563_configure(chip);
 859         if (ret)
 860                 goto out;
 861
 862         chip->suspended = false;
 863
 864 out:
 865         mutex_unlock(&chip->lock);
 866         return ret;
 867 }
 868
 869 static SIMPLE_DEV_PM_OPS(tsl2563_pm_ops, tsl2563_suspend, tsl2563_resume);
 870 #define TSL2563_PM_OPS (&tsl2563_pm_ops)
 871 #else
 872 #define TSL2563_PM_OPS NULL
 873 #endif
 874
 875 static const struct i2c_device_id tsl2563_id[] = {
 876         { "tsl2560", 0 },
 877         { "tsl2561", 1 },
 878         { "tsl2562", 2 },
 879         { "tsl2563", 3 },
 880         {}
 881 };
 882 MODULE_DEVICE_TABLE(i2c, tsl2563_id);
 883
 884 static struct i2c_driver tsl2563_i2c_driver = {
 885         .driver = {
 886                 .name    = "tsl2563",
 887                 .pm     = TSL2563_PM_OPS,
 888         },
 889         .probe          = tsl2563_probe,
 890         .remove         = tsl2563_remove,
 891         .id_table       = tsl2563_id,
 892 };
 893 module_i2c_driver(tsl2563_i2c_driver);
 894
 895 MODULE_AUTHOR("Nokia Corporation");
 896 MODULE_DESCRIPTION("tsl2563 light sensor driver");
 897 MODULE_LICENSE("GPL");