drivers/iio/light/tsl2563.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * drivers/iio/light/tsl2563.c
   4  *
   5  * Copyright (C) 2008 Nokia Corporation
   6  *
   7  * Written by Timo O. Karjalainen <timo.o.karjalainen@nokia.com>
   8  * Contact: Amit Kucheria <amit.kucheria@verdurent.com>
   9  *
  10  * Converted to IIO driver
  11  * Amit Kucheria <amit.kucheria@verdurent.com>
  12  */
  13
  14 #include <linux/bits.h>
  15 #include <linux/delay.h>
  16 #include <linux/err.h>
  17 #include <linux/i2c.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/irq.h>
  20 #include <linux/math.h>
  21 #include <linux/mod_devicetable.h>
  22 #include <linux/module.h>
  23 #include <linux/mutex.h>
  24 #include <linux/pm.h>
  25 #include <linux/property.h>
  26 #include <linux/sched.h>
  27 #include <linux/slab.h>
  28
  29 #include <linux/iio/events.h>
  30 #include <linux/iio/iio.h>
  31 #include <linux/iio/sysfs.h>
  32
  33 /* Use this many bits for fraction part. */
  34 #define ADC_FRAC_BITS           14
  35
  36 /* Given number of 1/10000's in ADC_FRAC_BITS precision. */
  37 #define FRAC10K(f)              (((f) * BIT(ADC_FRAC_BITS)) / (10000))
  38
  39 /* Bits used for fraction in calibration coefficients.*/
  40 #define CALIB_FRAC_BITS         10
  41 /* Decimal 10^(digits in sysfs presentation) */
  42 #define CALIB_BASE_SYSFS        1000
  43
  44 #define TSL2563_CMD             BIT(7)
  45 #define TSL2563_CLEARINT        BIT(6)
  46
  47 #define TSL2563_REG_CTRL        0x00
  48 #define TSL2563_REG_TIMING      0x01
  49 #define TSL2563_REG_LOW         0x02 /* data0 low threshold, 2 bytes */
  50 #define TSL2563_REG_HIGH        0x04 /* data0 high threshold, 2 bytes */
  51 #define TSL2563_REG_INT         0x06
  52 #define TSL2563_REG_ID          0x0a
  53 #define TSL2563_REG_DATA0       0x0c /* broadband sensor value, 2 bytes */
  54 #define TSL2563_REG_DATA1       0x0e /* infrared sensor value, 2 bytes */
  55
  56 #define TSL2563_CMD_POWER_ON    0x03
  57 #define TSL2563_CMD_POWER_OFF   0x00
  58 #define TSL2563_CTRL_POWER_MASK GENMASK(1, 0)
  59
  60 #define TSL2563_TIMING_13MS     0x00
  61 #define TSL2563_TIMING_100MS    0x01
  62 #define TSL2563_TIMING_400MS    0x02
  63 #define TSL2563_TIMING_MASK     GENMASK(1, 0)
  64 #define TSL2563_TIMING_GAIN16   0x10
  65 #define TSL2563_TIMING_GAIN1    0x00
  66
  67 #define TSL2563_INT_DISABLED    0x00
  68 #define TSL2563_INT_LEVEL       0x10
  69 #define TSL2563_INT_MASK        GENMASK(5, 4)
  70 #define TSL2563_INT_PERSIST(n)  ((n) & GENMASK(3, 0))
  71
  72 struct tsl2563_gainlevel_coeff {
  73         u8 gaintime;
  74         u16 min;
  75         u16 max;
  76 };
  77
  78 static const struct tsl2563_gainlevel_coeff tsl2563_gainlevel_table[] = {
  79         {
  80                 .gaintime       = TSL2563_TIMING_400MS | TSL2563_TIMING_GAIN16,
  81                 .min            = 0,
  82                 .max            = 65534,
  83         }, {
  84                 .gaintime       = TSL2563_TIMING_400MS | TSL2563_TIMING_GAIN1,
  85                 .min            = 2048,
  86                 .max            = 65534,
  87         }, {
  88                 .gaintime       = TSL2563_TIMING_100MS | TSL2563_TIMING_GAIN1,
  89                 .min            = 4095,
  90                 .max            = 37177,
  91         }, {
  92                 .gaintime       = TSL2563_TIMING_13MS | TSL2563_TIMING_GAIN1,
  93                 .min            = 3000,
  94                 .max            = 65535,
  95         },
  96 };
  97
  98 struct tsl2563_chip {
  99         struct mutex            lock;
 100         struct i2c_client       *client;
 101         struct delayed_work     poweroff_work;
 102
 103         /* Remember state for suspend and resume functions */
 104         bool suspended;
 105
 106         struct tsl2563_gainlevel_coeff const *gainlevel;
 107
 108         u16                     low_thres;
 109         u16                     high_thres;
 110         u8                      intr;
 111         bool                    int_enabled;
 112
 113         /* Calibration coefficients */
 114         u32                     calib0;
 115         u32                     calib1;
 116         int                     cover_comp_gain;
 117
 118         /* Cache current values, to be returned while suspended */
 119         u32                     data0;
 120         u32                     data1;
 121 };
 122
 123 static int tsl2563_set_power(struct tsl2563_chip *chip, int on)
 124 {
 125         struct i2c_client *client = chip->client;
 126         u8 cmd;
 127
 128         cmd = on ? TSL2563_CMD_POWER_ON : TSL2563_CMD_POWER_OFF;
 129         return i2c_smbus_write_byte_data(client,
 130                                          TSL2563_CMD | TSL2563_REG_CTRL, cmd);
 131 }
 132
 133 /*
 134  * Return value is 0 for off, 1 for on, or a negative error
 135  * code if reading failed.
 136  */
 137 static int tsl2563_get_power(struct tsl2563_chip *chip)
 138 {
 139         struct i2c_client *client = chip->client;
 140         int ret;
 141
 142         ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_CTRL);
 143         if (ret < 0)
 144                 return ret;
 145
 146         return (ret & TSL2563_CTRL_POWER_MASK) == TSL2563_CMD_POWER_ON;
 147 }
 148
 149 static int tsl2563_configure(struct tsl2563_chip *chip)
 150 {
 151         int ret;
 152
 153         ret = i2c_smbus_write_byte_data(chip->client,
 154                         TSL2563_CMD | TSL2563_REG_TIMING,
 155                         chip->gainlevel->gaintime);
 156         if (ret)
 157                 goto error_ret;
 158         ret = i2c_smbus_write_word_data(chip->client,
 159                         TSL2563_CMD | TSL2563_REG_HIGH,
 160                         chip->high_thres);
 161         if (ret)
 162                 goto error_ret;
 163         ret = i2c_smbus_write_word_data(chip->client,
 164                         TSL2563_CMD | TSL2563_REG_LOW,
 165                         chip->low_thres);
 166         if (ret)
 167                 goto error_ret;
 168 /*
 169  * Interrupt register is automatically written anyway if it is relevant
 170  * so is not here.
 171  */
 172 error_ret:
 173         return ret;
 174 }
 175
 176 static void tsl2563_poweroff_work(struct work_struct *work)
 177 {
 178         struct tsl2563_chip *chip =
 179                 container_of(work, struct tsl2563_chip, poweroff_work.work);
 180         tsl2563_set_power(chip, 0);
 181 }
 182
 183 static int tsl2563_detect(struct tsl2563_chip *chip)
 184 {
 185         int ret;
 186
 187         ret = tsl2563_set_power(chip, 1);
 188         if (ret)
 189                 return ret;
 190
 191         ret = tsl2563_get_power(chip);
 192         if (ret < 0)
 193                 return ret;
 194
 195         return ret ? 0 : -ENODEV;
 196 }
 197
 198 static int tsl2563_read_id(struct tsl2563_chip *chip, u8 *id)
 199 {
 200         struct i2c_client *client = chip->client;
 201         int ret;
 202
 203         ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_ID);
 204         if (ret < 0)
 205                 return ret;
 206
 207         *id = ret;
 208
 209         return 0;
 210 }
 211
 212 static int tsl2563_configure_irq(struct tsl2563_chip *chip, bool enable)
 213 {
 214         int ret;
 215
 216         chip->intr &= ~TSL2563_INT_MASK;
 217         if (enable)
 218                 chip->intr |= TSL2563_INT_LEVEL;
 219
 220         ret = i2c_smbus_write_byte_data(chip->client,
 221                                         TSL2563_CMD | TSL2563_REG_INT,
 222                                         chip->intr);
 223         if (ret < 0)
 224                 return ret;
 225
 226         chip->int_enabled = enable;
 227         return 0;
 228 }
 229
 230 /*
 231  * "Normalized" ADC value is one obtained with 400ms of integration time and
 232  * 16x gain. This function returns the number of bits of shift needed to
 233  * convert between normalized values and HW values obtained using given
 234  * timing and gain settings.
 235  */
 236 static int tsl2563_adc_shiftbits(u8 timing)
 237 {
 238         int shift = 0;
 239
 240         switch (timing & TSL2563_TIMING_MASK) {
 241         case TSL2563_TIMING_13MS:
 242                 shift += 5;
 243                 break;
 244         case TSL2563_TIMING_100MS:
 245                 shift += 2;
 246                 break;
 247         case TSL2563_TIMING_400MS:
 248                 /* no-op */
 249                 break;
 250         }
 251
 252         if (!(timing & TSL2563_TIMING_GAIN16))
 253                 shift += 4;
 254
 255         return shift;
 256 }
 257
 258 /* Convert a HW ADC value to normalized scale. */
 259 static u32 tsl2563_normalize_adc(u16 adc, u8 timing)
 260 {
 261         return adc << tsl2563_adc_shiftbits(timing);
 262 }
 263
 264 static void tsl2563_wait_adc(struct tsl2563_chip *chip)
 265 {
 266         unsigned int delay;
 267
 268         switch (chip->gainlevel->gaintime & TSL2563_TIMING_MASK) {
 269         case TSL2563_TIMING_13MS:
 270                 delay = 14;
 271                 break;
 272         case TSL2563_TIMING_100MS:
 273                 delay = 101;
 274                 break;
 275         default:
 276                 delay = 402;
 277         }
 278         /*
 279          * TODO: Make sure that we wait at least required delay but why we
 280          * have to extend it one tick more?
 281          */
 282         schedule_timeout_interruptible(msecs_to_jiffies(delay) + 2);
 283 }
 284
 285 static int tsl2563_adjust_gainlevel(struct tsl2563_chip *chip, u16 adc)
 286 {
 287         struct i2c_client *client = chip->client;
 288
 289         if (adc > chip->gainlevel->max || adc < chip->gainlevel->min) {
 290
 291                 (adc > chip->gainlevel->max) ?
 292                         chip->gainlevel++ : chip->gainlevel--;
 293
 294                 i2c_smbus_write_byte_data(client,
 295                                           TSL2563_CMD | TSL2563_REG_TIMING,
 296                                           chip->gainlevel->gaintime);
 297
 298                 tsl2563_wait_adc(chip);
 299                 tsl2563_wait_adc(chip);
 300
 301                 return 1;
 302         } else
 303                 return 0;
 304 }
 305
 306 static int tsl2563_get_adc(struct tsl2563_chip *chip)
 307 {
 308         struct i2c_client *client = chip->client;
 309         u16 adc0, adc1;
 310         int retry = 1;
 311         int ret = 0;
 312
 313         if (chip->suspended)
 314                 goto out;
 315
 316         if (!chip->int_enabled) {
 317                 cancel_delayed_work_sync(&chip->poweroff_work);
 318
 319                 if (!tsl2563_get_power(chip)) {
 320                         ret = tsl2563_set_power(chip, 1);
 321                         if (ret)
 322                                 goto out;
 323                         ret = tsl2563_configure(chip);
 324                         if (ret)
 325                                 goto out;
 326                         tsl2563_wait_adc(chip);
 327                 }
 328         }
 329
 330         while (retry) {
 331                 ret = i2c_smbus_read_word_data(client,
 332                                 TSL2563_CMD | TSL2563_REG_DATA0);
 333                 if (ret < 0)
 334                         goto out;
 335                 adc0 = ret;
 336
 337                 ret = i2c_smbus_read_word_data(client,
 338                                 TSL2563_CMD | TSL2563_REG_DATA1);
 339                 if (ret < 0)
 340                         goto out;
 341                 adc1 = ret;
 342
 343                 retry = tsl2563_adjust_gainlevel(chip, adc0);
 344         }
 345
 346         chip->data0 = tsl2563_normalize_adc(adc0, chip->gainlevel->gaintime);
 347         chip->data1 = tsl2563_normalize_adc(adc1, chip->gainlevel->gaintime);
 348
 349         if (!chip->int_enabled)
 350                 schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
 351
 352         ret = 0;
 353 out:
 354         return ret;
 355 }
 356
 357 static inline int tsl2563_calib_to_sysfs(u32 calib)
 358 {
 359         return (int)DIV_ROUND_CLOSEST(calib * CALIB_BASE_SYSFS, BIT(CALIB_FRAC_BITS));
 360 }
 361
 362 static inline u32 tsl2563_calib_from_sysfs(int value)
 363 {
 364         /* Make a fraction from a number n that was multiplied with b. */
 365         return (((u32) value) << CALIB_FRAC_BITS) / CALIB_BASE_SYSFS;
 366 }
 367
 368 /*
 369  * Conversions between lux and ADC values.
 370  *
 371  * The basic formula is lux = c0 * adc0 - c1 * adc1, where c0 and c1 are
 372  * appropriate constants. Different constants are needed for different
 373  * kinds of light, determined by the ratio adc1/adc0 (basically the ratio
 374  * of the intensities in infrared and visible wavelengths). lux_table below
 375  * lists the upper threshold of the adc1/adc0 ratio and the corresponding
 376  * constants.
 377  */
 378
 379 struct tsl2563_lux_coeff {
 380         unsigned long ch_ratio;
 381         unsigned long ch0_coeff;
 382         unsigned long ch1_coeff;
 383 };
 384
 385 static const struct tsl2563_lux_coeff lux_table[] = {
 386         {
 387                 .ch_ratio       = FRAC10K(1300),
 388                 .ch0_coeff      = FRAC10K(315),
 389                 .ch1_coeff      = FRAC10K(262),
 390         }, {
 391                 .ch_ratio       = FRAC10K(2600),
 392                 .ch0_coeff      = FRAC10K(337),
 393                 .ch1_coeff      = FRAC10K(430),
 394         }, {
 395                 .ch_ratio       = FRAC10K(3900),
 396                 .ch0_coeff      = FRAC10K(363),
 397                 .ch1_coeff      = FRAC10K(529),
 398         }, {
 399                 .ch_ratio       = FRAC10K(5200),
 400                 .ch0_coeff      = FRAC10K(392),
 401                 .ch1_coeff      = FRAC10K(605),
 402         }, {
 403                 .ch_ratio       = FRAC10K(6500),
 404                 .ch0_coeff      = FRAC10K(229),
 405                 .ch1_coeff      = FRAC10K(291),
 406         }, {
 407                 .ch_ratio       = FRAC10K(8000),
 408                 .ch0_coeff      = FRAC10K(157),
 409                 .ch1_coeff      = FRAC10K(180),
 410         }, {
 411                 .ch_ratio       = FRAC10K(13000),
 412                 .ch0_coeff      = FRAC10K(34),
 413                 .ch1_coeff      = FRAC10K(26),
 414         }, {
 415                 .ch_ratio       = ULONG_MAX,
 416                 .ch0_coeff      = 0,
 417                 .ch1_coeff      = 0,
 418         },
 419 };
 420
 421 /* Convert normalized, scaled ADC values to lux. */
 422 static unsigned int tsl2563_adc_to_lux(u32 adc0, u32 adc1)
 423 {
 424         const struct tsl2563_lux_coeff *lp = lux_table;
 425         unsigned long ratio, lux, ch0 = adc0, ch1 = adc1;
 426
 427         ratio = ch0 ? ((ch1 << ADC_FRAC_BITS) / ch0) : ULONG_MAX;
 428
 429         while (lp->ch_ratio < ratio)
 430                 lp++;
 431
 432         lux = ch0 * lp->ch0_coeff - ch1 * lp->ch1_coeff;
 433
 434         return (unsigned int) (lux >> ADC_FRAC_BITS);
 435 }
 436
 437 /* Apply calibration coefficient to ADC count. */
 438 static u32 tsl2563_calib_adc(u32 adc, u32 calib)
 439 {
 440         unsigned long scaled = adc;
 441
 442         scaled *= calib;
 443         scaled >>= CALIB_FRAC_BITS;
 444
 445         return (u32) scaled;
 446 }
 447
 448 static int tsl2563_write_raw(struct iio_dev *indio_dev,
 449                                struct iio_chan_spec const *chan,
 450                                int val,
 451                                int val2,
 452                                long mask)
 453 {
 454         struct tsl2563_chip *chip = iio_priv(indio_dev);
 455
 456         if (mask != IIO_CHAN_INFO_CALIBSCALE)
 457                 return -EINVAL;
 458         if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
 459                 chip->calib0 = tsl2563_calib_from_sysfs(val);
 460         else if (chan->channel2 == IIO_MOD_LIGHT_IR)
 461                 chip->calib1 = tsl2563_calib_from_sysfs(val);
 462         else
 463                 return -EINVAL;
 464
 465         return 0;
 466 }
 467
 468 static int tsl2563_read_raw(struct iio_dev *indio_dev,
 469                             struct iio_chan_spec const *chan,
 470                             int *val,
 471                             int *val2,
 472                             long mask)
 473 {
 474         int ret = -EINVAL;
 475         u32 calib0, calib1;
 476         struct tsl2563_chip *chip = iio_priv(indio_dev);
 477
 478         mutex_lock(&chip->lock);
 479         switch (mask) {
 480         case IIO_CHAN_INFO_RAW:
 481         case IIO_CHAN_INFO_PROCESSED:
 482                 switch (chan->type) {
 483                 case IIO_LIGHT:
 484                         ret = tsl2563_get_adc(chip);
 485                         if (ret)
 486                                 goto error_ret;
 487                         calib0 = tsl2563_calib_adc(chip->data0, chip->calib0) *
 488                                 chip->cover_comp_gain;
 489                         calib1 = tsl2563_calib_adc(chip->data1, chip->calib1) *
 490                                 chip->cover_comp_gain;
 491                         *val = tsl2563_adc_to_lux(calib0, calib1);
 492                         ret = IIO_VAL_INT;
 493                         break;
 494                 case IIO_INTENSITY:
 495                         ret = tsl2563_get_adc(chip);
 496                         if (ret)
 497                                 goto error_ret;
 498                         if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
 499                                 *val = chip->data0;
 500                         else
 501                                 *val = chip->data1;
 502                         ret = IIO_VAL_INT;
 503                         break;
 504                 default:
 505                         break;
 506                 }
 507                 break;
 508
 509         case IIO_CHAN_INFO_CALIBSCALE:
 510                 if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
 511                         *val = tsl2563_calib_to_sysfs(chip->calib0);
 512                 else
 513                         *val = tsl2563_calib_to_sysfs(chip->calib1);
 514                 ret = IIO_VAL_INT;
 515                 break;
 516         default:
 517                 ret = -EINVAL;
 518                 goto error_ret;
 519         }
 520
 521 error_ret:
 522         mutex_unlock(&chip->lock);
 523         return ret;
 524 }
 525
 526 static const struct iio_event_spec tsl2563_events[] = {
 527         {
 528                 .type = IIO_EV_TYPE_THRESH,
 529                 .dir = IIO_EV_DIR_RISING,
 530                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 531                                 BIT(IIO_EV_INFO_ENABLE),
 532         }, {
 533                 .type = IIO_EV_TYPE_THRESH,
 534                 .dir = IIO_EV_DIR_FALLING,
 535                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 536                                 BIT(IIO_EV_INFO_ENABLE),
 537         },
 538 };
 539
 540 static const struct iio_chan_spec tsl2563_channels[] = {
 541         {
 542                 .type = IIO_LIGHT,
 543                 .indexed = 1,
 544                 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
 545                 .channel = 0,
 546         }, {
 547                 .type = IIO_INTENSITY,
 548                 .modified = 1,
 549                 .channel2 = IIO_MOD_LIGHT_BOTH,
 550                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 551                 BIT(IIO_CHAN_INFO_CALIBSCALE),
 552                 .event_spec = tsl2563_events,
 553                 .num_event_specs = ARRAY_SIZE(tsl2563_events),
 554         }, {
 555                 .type = IIO_INTENSITY,
 556                 .modified = 1,
 557                 .channel2 = IIO_MOD_LIGHT_IR,
 558                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 559                 BIT(IIO_CHAN_INFO_CALIBSCALE),
 560         }
 561 };
 562
 563 static int tsl2563_read_thresh(struct iio_dev *indio_dev,
 564         const struct iio_chan_spec *chan, enum iio_event_type type,
 565         enum iio_event_direction dir, enum iio_event_info info, int *val,
 566         int *val2)
 567 {
 568         struct tsl2563_chip *chip = iio_priv(indio_dev);
 569
 570         switch (dir) {
 571         case IIO_EV_DIR_RISING:
 572                 *val = chip->high_thres;
 573                 break;
 574         case IIO_EV_DIR_FALLING:
 575                 *val = chip->low_thres;
 576                 break;
 577         default:
 578                 return -EINVAL;
 579         }
 580
 581         return IIO_VAL_INT;
 582 }
 583
 584 static int tsl2563_write_thresh(struct iio_dev *indio_dev,
 585         const struct iio_chan_spec *chan, enum iio_event_type type,
 586         enum iio_event_direction dir, enum iio_event_info info, int val,
 587         int val2)
 588 {
 589         struct tsl2563_chip *chip = iio_priv(indio_dev);
 590         int ret;
 591
 592         mutex_lock(&chip->lock);
 593
 594         if (dir == IIO_EV_DIR_RISING)
 595                 ret = i2c_smbus_write_word_data(chip->client,
 596                                                 TSL2563_CMD | TSL2563_REG_HIGH, val);
 597         else
 598                 ret = i2c_smbus_write_word_data(chip->client,
 599                                                 TSL2563_CMD | TSL2563_REG_LOW, val);
 600         if (ret)
 601                 goto error_ret;
 602
 603         if (dir == IIO_EV_DIR_RISING)
 604                 chip->high_thres = val;
 605         else
 606                 chip->low_thres = val;
 607
 608 error_ret:
 609         mutex_unlock(&chip->lock);
 610
 611         return ret;
 612 }
 613
 614 static irqreturn_t tsl2563_event_handler(int irq, void *private)
 615 {
 616         struct iio_dev *dev_info = private;
 617         struct tsl2563_chip *chip = iio_priv(dev_info);
 618
 619         iio_push_event(dev_info,
 620                        IIO_UNMOD_EVENT_CODE(IIO_INTENSITY,
 621                                             0,
 622                                             IIO_EV_TYPE_THRESH,
 623                                             IIO_EV_DIR_EITHER),
 624                        iio_get_time_ns(dev_info));
 625
 626         /* clear the interrupt and push the event */
 627         i2c_smbus_write_byte(chip->client, TSL2563_CMD | TSL2563_CLEARINT);
 628         return IRQ_HANDLED;
 629 }
 630
 631 static int tsl2563_write_interrupt_config(struct iio_dev *indio_dev,
 632         const struct iio_chan_spec *chan, enum iio_event_type type,
 633         enum iio_event_direction dir, bool state)
 634 {
 635         struct tsl2563_chip *chip = iio_priv(indio_dev);
 636         int ret = 0;
 637
 638         mutex_lock(&chip->lock);
 639         if (state && !(chip->intr & TSL2563_INT_MASK)) {
 640                 /* ensure the chip is actually on */
 641                 cancel_delayed_work_sync(&chip->poweroff_work);
 642                 if (!tsl2563_get_power(chip)) {
 643                         ret = tsl2563_set_power(chip, 1);
 644                         if (ret)
 645                                 goto out;
 646                         ret = tsl2563_configure(chip);
 647                         if (ret)
 648                                 goto out;
 649                 }
 650                 ret = tsl2563_configure_irq(chip, true);
 651         }
 652
 653         if (!state && (chip->intr & TSL2563_INT_MASK)) {
 654                 ret = tsl2563_configure_irq(chip, false);
 655                 /* now the interrupt is not enabled, we can go to sleep */
 656                 schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
 657         }
 658 out:
 659         mutex_unlock(&chip->lock);
 660
 661         return ret;
 662 }
 663
 664 static int tsl2563_read_interrupt_config(struct iio_dev *indio_dev,
 665         const struct iio_chan_spec *chan, enum iio_event_type type,
 666         enum iio_event_direction dir)
 667 {
 668         struct tsl2563_chip *chip = iio_priv(indio_dev);
 669         int ret;
 670
 671         mutex_lock(&chip->lock);
 672         ret = i2c_smbus_read_byte_data(chip->client,
 673                                        TSL2563_CMD | TSL2563_REG_INT);
 674         mutex_unlock(&chip->lock);
 675         if (ret < 0)
 676                 return ret;
 677
 678         return !!(ret & TSL2563_INT_MASK);
 679 }
 680
 681 static const struct iio_info tsl2563_info_no_irq = {
 682         .read_raw = &tsl2563_read_raw,
 683         .write_raw = &tsl2563_write_raw,
 684 };
 685
 686 static const struct iio_info tsl2563_info = {
 687         .read_raw = &tsl2563_read_raw,
 688         .write_raw = &tsl2563_write_raw,
 689         .read_event_value = &tsl2563_read_thresh,
 690         .write_event_value = &tsl2563_write_thresh,
 691         .read_event_config = &tsl2563_read_interrupt_config,
 692         .write_event_config = &tsl2563_write_interrupt_config,
 693 };
 694
 695 static int tsl2563_probe(struct i2c_client *client)
 696 {
 697         struct device *dev = &client->dev;
 698         struct iio_dev *indio_dev;
 699         struct tsl2563_chip *chip;
 700         unsigned long irq_flags;
 701         u8 id = 0;
 702         int err;
 703
 704         indio_dev = devm_iio_device_alloc(dev, sizeof(*chip));
 705         if (!indio_dev)
 706                 return -ENOMEM;
 707
 708         chip = iio_priv(indio_dev);
 709
 710         i2c_set_clientdata(client, indio_dev);
 711         chip->client = client;
 712
 713         err = tsl2563_detect(chip);
 714         if (err)
 715                 return dev_err_probe(dev, err, "detect error\n");
 716
 717         err = tsl2563_read_id(chip, &id);
 718         if (err)
 719                 return dev_err_probe(dev, err, "read id error\n");
 720
 721         mutex_init(&chip->lock);
 722
 723         /* Default values used until userspace says otherwise */
 724         chip->low_thres = 0x0;
 725         chip->high_thres = 0xffff;
 726         chip->gainlevel = tsl2563_gainlevel_table;
 727         chip->intr = TSL2563_INT_PERSIST(4);
 728         chip->calib0 = tsl2563_calib_from_sysfs(CALIB_BASE_SYSFS);
 729         chip->calib1 = tsl2563_calib_from_sysfs(CALIB_BASE_SYSFS);
 730
 731         chip->cover_comp_gain = 1;
 732         device_property_read_u32(dev, "amstaos,cover-comp-gain", &chip->cover_comp_gain);
 733
 734         dev_info(dev, "model %d, rev. %d\n", id >> 4, id & 0x0f);
 735         indio_dev->name = client->name;
 736         indio_dev->channels = tsl2563_channels;
 737         indio_dev->num_channels = ARRAY_SIZE(tsl2563_channels);
 738         indio_dev->modes = INDIO_DIRECT_MODE;
 739
 740         if (client->irq)
 741                 indio_dev->info = &tsl2563_info;
 742         else
 743                 indio_dev->info = &tsl2563_info_no_irq;
 744
 745         if (client->irq) {
 746                 irq_flags = irq_get_trigger_type(client->irq);
 747                 if (irq_flags == IRQF_TRIGGER_NONE)
 748                         irq_flags = IRQF_TRIGGER_RISING;
 749                 irq_flags |= IRQF_ONESHOT;
 750
 751                 err = devm_request_threaded_irq(dev, client->irq,
 752                                            NULL,
 753                                            &tsl2563_event_handler,
 754                                            irq_flags,
 755                                            "tsl2563_event",
 756                                            indio_dev);
 757                 if (err)
 758                         return dev_err_probe(dev, err, "irq request error\n");
 759         }
 760
 761         err = tsl2563_configure(chip);
 762         if (err)
 763                 return dev_err_probe(dev, err, "configure error\n");
 764
 765         INIT_DELAYED_WORK(&chip->poweroff_work, tsl2563_poweroff_work);
 766
 767         /* The interrupt cannot yet be enabled so this is fine without lock */
 768         schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
 769
 770         err = iio_device_register(indio_dev);
 771         if (err) {
 772                 dev_err_probe(dev, err, "iio registration error\n");
 773                 goto fail;
 774         }
 775
 776         return 0;
 777
 778 fail:
 779         cancel_delayed_work_sync(&chip->poweroff_work);
 780         return err;
 781 }
 782
 783 static void tsl2563_remove(struct i2c_client *client)
 784 {
 785         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 786         struct tsl2563_chip *chip = iio_priv(indio_dev);
 787
 788         iio_device_unregister(indio_dev);
 789         if (!chip->int_enabled)
 790                 cancel_delayed_work_sync(&chip->poweroff_work);
 791         /* Ensure that interrupts are disabled - then flush any bottom halves */
 792         tsl2563_configure_irq(chip, false);
 793         tsl2563_set_power(chip, 0);
 794 }
 795
 796 static int tsl2563_suspend(struct device *dev)
 797 {
 798         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 799         struct tsl2563_chip *chip = iio_priv(indio_dev);
 800         int ret;
 801
 802         mutex_lock(&chip->lock);
 803
 804         ret = tsl2563_set_power(chip, 0);
 805         if (ret)
 806                 goto out;
 807
 808         chip->suspended = true;
 809
 810 out:
 811         mutex_unlock(&chip->lock);
 812         return ret;
 813 }
 814
 815 static int tsl2563_resume(struct device *dev)
 816 {
 817         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 818         struct tsl2563_chip *chip = iio_priv(indio_dev);
 819         int ret;
 820
 821         mutex_lock(&chip->lock);
 822
 823         ret = tsl2563_set_power(chip, 1);
 824         if (ret)
 825                 goto out;
 826
 827         ret = tsl2563_configure(chip);
 828         if (ret)
 829                 goto out;
 830
 831         chip->suspended = false;
 832
 833 out:
 834         mutex_unlock(&chip->lock);
 835         return ret;
 836 }
 837
 838 static DEFINE_SIMPLE_DEV_PM_OPS(tsl2563_pm_ops, tsl2563_suspend,
 839                                 tsl2563_resume);
 840
 841 static const struct i2c_device_id tsl2563_id[] = {
 842         { "tsl2560", 0 },
 843         { "tsl2561", 1 },
 844         { "tsl2562", 2 },
 845         { "tsl2563", 3 },
 846         {}
 847 };
 848 MODULE_DEVICE_TABLE(i2c, tsl2563_id);
 849
 850 static const struct of_device_id tsl2563_of_match[] = {
 851         { .compatible = "amstaos,tsl2560" },
 852         { .compatible = "amstaos,tsl2561" },
 853         { .compatible = "amstaos,tsl2562" },
 854         { .compatible = "amstaos,tsl2563" },
 855         {}
 856 };
 857 MODULE_DEVICE_TABLE(of, tsl2563_of_match);
 858
 859 static struct i2c_driver tsl2563_i2c_driver = {
 860         .driver = {
 861                 .name    = "tsl2563",
 862                 .of_match_table = tsl2563_of_match,
 863                 .pm     = pm_sleep_ptr(&tsl2563_pm_ops),
 864         },
 865         .probe          = tsl2563_probe,
 866         .remove         = tsl2563_remove,
 867         .id_table       = tsl2563_id,
 868 };
 869 module_i2c_driver(tsl2563_i2c_driver);
 870
 871 MODULE_AUTHOR("Nokia Corporation");
 872 MODULE_DESCRIPTION("tsl2563 light sensor driver");
 873 MODULE_LICENSE("GPL");