root/drivers/iio/light/tsl2563.c

DEFINITIONS

1. tsl2563_set_power
2. tsl2563_get_power
3. tsl2563_configure
4. tsl2563_poweroff_work
5. tsl2563_detect
6. tsl2563_read_id
7. tsl2563_adc_shiftbits
8. tsl2563_normalize_adc
9. tsl2563_wait_adc
10. tsl2563_adjust_gainlevel
11. tsl2563_get_adc
12. tsl2563_calib_to_sysfs
13. tsl2563_calib_from_sysfs
14. tsl2563_adc_to_lux
15. tsl2563_calib_adc
16. tsl2563_write_raw
17. tsl2563_read_raw
18. tsl2563_read_thresh
19. tsl2563_write_thresh
20. tsl2563_event_handler
21. tsl2563_write_interrupt_config
22. tsl2563_read_interrupt_config
23. tsl2563_probe
24. tsl2563_remove
25. tsl2563_suspend
26. tsl2563_resume

   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/module.h>
  15 #include <linux/i2c.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/irq.h>
  18 #include <linux/sched.h>
  19 #include <linux/mutex.h>
  20 #include <linux/delay.h>
  21 #include <linux/pm.h>
  22 #include <linux/err.h>
  23 #include <linux/slab.h>
  24 
  25 #include <linux/iio/iio.h>
  26 #include <linux/iio/sysfs.h>
  27 #include <linux/iio/events.h>
  28 #include <linux/platform_data/tsl2563.h>
  29 
  30 /* Use this many bits for fraction part. */
  31 #define ADC_FRAC_BITS           14
  32 
  33 /* Given number of 1/10000's in ADC_FRAC_BITS precision. */
  34 #define FRAC10K(f)              (((f) * (1L << (ADC_FRAC_BITS))) / (10000))
  35 
  36 /* Bits used for fraction in calibration coefficients.*/
  37 #define CALIB_FRAC_BITS         10
  38 /* 0.5 in CALIB_FRAC_BITS precision */
  39 #define CALIB_FRAC_HALF         (1 << (CALIB_FRAC_BITS - 1))
  40 /* Make a fraction from a number n that was multiplied with b. */
  41 #define CALIB_FRAC(n, b)        (((n) << CALIB_FRAC_BITS) / (b))
  42 /* Decimal 10^(digits in sysfs presentation) */
  43 #define CALIB_BASE_SYSFS        1000
  44 
  45 #define TSL2563_CMD             0x80
  46 #define TSL2563_CLEARINT        0x40
  47 
  48 #define TSL2563_REG_CTRL        0x00
  49 #define TSL2563_REG_TIMING      0x01
  50 #define TSL2563_REG_LOWLOW      0x02 /* data0 low threshold, 2 bytes */
  51 #define TSL2563_REG_LOWHIGH     0x03
  52 #define TSL2563_REG_HIGHLOW     0x04 /* data0 high threshold, 2 bytes */
  53 #define TSL2563_REG_HIGHHIGH    0x05
  54 #define TSL2563_REG_INT         0x06
  55 #define TSL2563_REG_ID          0x0a
  56 #define TSL2563_REG_DATA0LOW    0x0c /* broadband sensor value, 2 bytes */
  57 #define TSL2563_REG_DATA0HIGH   0x0d
  58 #define TSL2563_REG_DATA1LOW    0x0e /* infrared sensor value, 2 bytes */
  59 #define TSL2563_REG_DATA1HIGH   0x0f
  60 
  61 #define TSL2563_CMD_POWER_ON    0x03
  62 #define TSL2563_CMD_POWER_OFF   0x00
  63 #define TSL2563_CTRL_POWER_MASK 0x03
  64 
  65 #define TSL2563_TIMING_13MS     0x00
  66 #define TSL2563_TIMING_100MS    0x01
  67 #define TSL2563_TIMING_400MS    0x02
  68 #define TSL2563_TIMING_MASK     0x03
  69 #define TSL2563_TIMING_GAIN16   0x10
  70 #define TSL2563_TIMING_GAIN1    0x00
  71 
  72 #define TSL2563_INT_DISBLED     0x00
  73 #define TSL2563_INT_LEVEL       0x10
  74 #define TSL2563_INT_PERSIST(n)  ((n) & 0x0F)
  75 
  76 struct tsl2563_gainlevel_coeff {
  77         u8 gaintime;
  78         u16 min;
  79         u16 max;
  80 };
  81 
  82 static const struct tsl2563_gainlevel_coeff tsl2563_gainlevel_table[] = {
  83         {
  84                 .gaintime       = TSL2563_TIMING_400MS | TSL2563_TIMING_GAIN16,
  85                 .min            = 0,
  86                 .max            = 65534,
  87         }, {
  88                 .gaintime       = TSL2563_TIMING_400MS | TSL2563_TIMING_GAIN1,
  89                 .min            = 2048,
  90                 .max            = 65534,
  91         }, {
  92                 .gaintime       = TSL2563_TIMING_100MS | TSL2563_TIMING_GAIN1,
  93                 .min            = 4095,
  94                 .max            = 37177,
  95         }, {
  96                 .gaintime       = TSL2563_TIMING_13MS | TSL2563_TIMING_GAIN1,
  97                 .min            = 3000,
  98                 .max            = 65535,
  99         },
 100 };
 101 
 102 struct tsl2563_chip {
 103         struct mutex            lock;
 104         struct i2c_client       *client;
 105         struct delayed_work     poweroff_work;
 106 
 107         /* Remember state for suspend and resume functions */
 108         bool suspended;
 109 
 110         struct tsl2563_gainlevel_coeff const *gainlevel;
 111 
 112         u16                     low_thres;
 113         u16                     high_thres;
 114         u8                      intr;
 115         bool                    int_enabled;
 116 
 117         /* Calibration coefficients */
 118         u32                     calib0;
 119         u32                     calib1;
 120         int                     cover_comp_gain;
 121 
 122         /* Cache current values, to be returned while suspended */
 123         u32                     data0;
 124         u32                     data1;
 125 };
 126 
 127 static int tsl2563_set_power(struct tsl2563_chip *chip, int on)
 128 {
 129         struct i2c_client *client = chip->client;
 130         u8 cmd;
 131 
 132         cmd = on ? TSL2563_CMD_POWER_ON : TSL2563_CMD_POWER_OFF;
 133         return i2c_smbus_write_byte_data(client,
 134                                          TSL2563_CMD | TSL2563_REG_CTRL, cmd);
 135 }
 136 
 137 /*
 138  * Return value is 0 for off, 1 for on, or a negative error
 139  * code if reading failed.
 140  */
 141 static int tsl2563_get_power(struct tsl2563_chip *chip)
 142 {
 143         struct i2c_client *client = chip->client;
 144         int ret;
 145 
 146         ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_CTRL);
 147         if (ret < 0)
 148                 return ret;
 149 
 150         return (ret & TSL2563_CTRL_POWER_MASK) == TSL2563_CMD_POWER_ON;
 151 }
 152 
 153 static int tsl2563_configure(struct tsl2563_chip *chip)
 154 {
 155         int ret;
 156 
 157         ret = i2c_smbus_write_byte_data(chip->client,
 158                         TSL2563_CMD | TSL2563_REG_TIMING,
 159                         chip->gainlevel->gaintime);
 160         if (ret)
 161                 goto error_ret;
 162         ret = i2c_smbus_write_byte_data(chip->client,
 163                         TSL2563_CMD | TSL2563_REG_HIGHLOW,
 164                         chip->high_thres & 0xFF);
 165         if (ret)
 166                 goto error_ret;
 167         ret = i2c_smbus_write_byte_data(chip->client,
 168                         TSL2563_CMD | TSL2563_REG_HIGHHIGH,
 169                         (chip->high_thres >> 8) & 0xFF);
 170         if (ret)
 171                 goto error_ret;
 172         ret = i2c_smbus_write_byte_data(chip->client,
 173                         TSL2563_CMD | TSL2563_REG_LOWLOW,
 174                         chip->low_thres & 0xFF);
 175         if (ret)
 176                 goto error_ret;
 177         ret = i2c_smbus_write_byte_data(chip->client,
 178                         TSL2563_CMD | TSL2563_REG_LOWHIGH,
 179                         (chip->low_thres >> 8) & 0xFF);
 180 /*
 181  * Interrupt register is automatically written anyway if it is relevant
 182  * so is not here.
 183  */
 184 error_ret:
 185         return ret;
 186 }
 187 
 188 static void tsl2563_poweroff_work(struct work_struct *work)
 189 {
 190         struct tsl2563_chip *chip =
 191                 container_of(work, struct tsl2563_chip, poweroff_work.work);
 192         tsl2563_set_power(chip, 0);
 193 }
 194 
 195 static int tsl2563_detect(struct tsl2563_chip *chip)
 196 {
 197         int ret;
 198 
 199         ret = tsl2563_set_power(chip, 1);
 200         if (ret)
 201                 return ret;
 202 
 203         ret = tsl2563_get_power(chip);
 204         if (ret < 0)
 205                 return ret;
 206 
 207         return ret ? 0 : -ENODEV;
 208 }
 209 
 210 static int tsl2563_read_id(struct tsl2563_chip *chip, u8 *id)
 211 {
 212         struct i2c_client *client = chip->client;
 213         int ret;
 214 
 215         ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_ID);
 216         if (ret < 0)
 217                 return ret;
 218 
 219         *id = ret;
 220 
 221         return 0;
 222 }
 223 
 224 /*
 225  * "Normalized" ADC value is one obtained with 400ms of integration time and
 226  * 16x gain. This function returns the number of bits of shift needed to
 227  * convert between normalized values and HW values obtained using given
 228  * timing and gain settings.
 229  */
 230 static int tsl2563_adc_shiftbits(u8 timing)
 231 {
 232         int shift = 0;
 233 
 234         switch (timing & TSL2563_TIMING_MASK) {
 235         case TSL2563_TIMING_13MS:
 236                 shift += 5;
 237                 break;
 238         case TSL2563_TIMING_100MS:
 239                 shift += 2;
 240                 break;
 241         case TSL2563_TIMING_400MS:
 242                 /* no-op */
 243                 break;
 244         }
 245 
 246         if (!(timing & TSL2563_TIMING_GAIN16))
 247                 shift += 4;
 248 
 249         return shift;
 250 }
 251 
 252 /* Convert a HW ADC value to normalized scale. */
 253 static u32 tsl2563_normalize_adc(u16 adc, u8 timing)
 254 {
 255         return adc << tsl2563_adc_shiftbits(timing);
 256 }
 257 
 258 static void tsl2563_wait_adc(struct tsl2563_chip *chip)
 259 {
 260         unsigned int delay;
 261 
 262         switch (chip->gainlevel->gaintime & TSL2563_TIMING_MASK) {
 263         case TSL2563_TIMING_13MS:
 264                 delay = 14;
 265                 break;
 266         case TSL2563_TIMING_100MS:
 267                 delay = 101;
 268                 break;
 269         default:
 270                 delay = 402;
 271         }
 272         /*
 273          * TODO: Make sure that we wait at least required delay but why we
 274          * have to extend it one tick more?
 275          */
 276         schedule_timeout_interruptible(msecs_to_jiffies(delay) + 2);
 277 }
 278 
 279 static int tsl2563_adjust_gainlevel(struct tsl2563_chip *chip, u16 adc)
 280 {
 281         struct i2c_client *client = chip->client;
 282 
 283         if (adc > chip->gainlevel->max || adc < chip->gainlevel->min) {
 284 
 285                 (adc > chip->gainlevel->max) ?
 286                         chip->gainlevel++ : chip->gainlevel--;
 287 
 288                 i2c_smbus_write_byte_data(client,
 289                                           TSL2563_CMD | TSL2563_REG_TIMING,
 290                                           chip->gainlevel->gaintime);
 291 
 292                 tsl2563_wait_adc(chip);
 293                 tsl2563_wait_adc(chip);
 294 
 295                 return 1;
 296         } else
 297                 return 0;
 298 }
 299 
 300 static int tsl2563_get_adc(struct tsl2563_chip *chip)
 301 {
 302         struct i2c_client *client = chip->client;
 303         u16 adc0, adc1;
 304         int retry = 1;
 305         int ret = 0;
 306 
 307         if (chip->suspended)
 308                 goto out;
 309 
 310         if (!chip->int_enabled) {
 311                 cancel_delayed_work(&chip->poweroff_work);
 312 
 313                 if (!tsl2563_get_power(chip)) {
 314                         ret = tsl2563_set_power(chip, 1);
 315                         if (ret)
 316                                 goto out;
 317                         ret = tsl2563_configure(chip);
 318                         if (ret)
 319                                 goto out;
 320                         tsl2563_wait_adc(chip);
 321                 }
 322         }
 323 
 324         while (retry) {
 325                 ret = i2c_smbus_read_word_data(client,
 326                                 TSL2563_CMD | TSL2563_REG_DATA0LOW);
 327                 if (ret < 0)
 328                         goto out;
 329                 adc0 = ret;
 330 
 331                 ret = i2c_smbus_read_word_data(client,
 332                                 TSL2563_CMD | TSL2563_REG_DATA1LOW);
 333                 if (ret < 0)
 334                         goto out;
 335                 adc1 = ret;
 336 
 337                 retry = tsl2563_adjust_gainlevel(chip, adc0);
 338         }
 339 
 340         chip->data0 = tsl2563_normalize_adc(adc0, chip->gainlevel->gaintime);
 341         chip->data1 = tsl2563_normalize_adc(adc1, chip->gainlevel->gaintime);
 342 
 343         if (!chip->int_enabled)
 344                 schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
 345 
 346         ret = 0;
 347 out:
 348         return ret;
 349 }
 350 
 351 static inline int tsl2563_calib_to_sysfs(u32 calib)
 352 {
 353         return (int) (((calib * CALIB_BASE_SYSFS) +
 354                        CALIB_FRAC_HALF) >> CALIB_FRAC_BITS);
 355 }
 356 
 357 static inline u32 tsl2563_calib_from_sysfs(int value)
 358 {
 359         return (((u32) value) << CALIB_FRAC_BITS) / CALIB_BASE_SYSFS;
 360 }
 361 
 362 /*
 363  * Conversions between lux and ADC values.
 364  *
 365  * The basic formula is lux = c0 * adc0 - c1 * adc1, where c0 and c1 are
 366  * appropriate constants. Different constants are needed for different
 367  * kinds of light, determined by the ratio adc1/adc0 (basically the ratio
 368  * of the intensities in infrared and visible wavelengths). lux_table below
 369  * lists the upper threshold of the adc1/adc0 ratio and the corresponding
 370  * constants.
 371  */
 372 
 373 struct tsl2563_lux_coeff {
 374         unsigned long ch_ratio;
 375         unsigned long ch0_coeff;
 376         unsigned long ch1_coeff;
 377 };
 378 
 379 static const struct tsl2563_lux_coeff lux_table[] = {
 380         {
 381                 .ch_ratio       = FRAC10K(1300),
 382                 .ch0_coeff      = FRAC10K(315),
 383                 .ch1_coeff      = FRAC10K(262),
 384         }, {
 385                 .ch_ratio       = FRAC10K(2600),
 386                 .ch0_coeff      = FRAC10K(337),
 387                 .ch1_coeff      = FRAC10K(430),
 388         }, {
 389                 .ch_ratio       = FRAC10K(3900),
 390                 .ch0_coeff      = FRAC10K(363),
 391                 .ch1_coeff      = FRAC10K(529),
 392         }, {
 393                 .ch_ratio       = FRAC10K(5200),
 394                 .ch0_coeff      = FRAC10K(392),
 395                 .ch1_coeff      = FRAC10K(605),
 396         }, {
 397                 .ch_ratio       = FRAC10K(6500),
 398                 .ch0_coeff      = FRAC10K(229),
 399                 .ch1_coeff      = FRAC10K(291),
 400         }, {
 401                 .ch_ratio       = FRAC10K(8000),
 402                 .ch0_coeff      = FRAC10K(157),
 403                 .ch1_coeff      = FRAC10K(180),
 404         }, {
 405                 .ch_ratio       = FRAC10K(13000),
 406                 .ch0_coeff      = FRAC10K(34),
 407                 .ch1_coeff      = FRAC10K(26),
 408         }, {
 409                 .ch_ratio       = ULONG_MAX,
 410                 .ch0_coeff      = 0,
 411                 .ch1_coeff      = 0,
 412         },
 413 };
 414 
 415 /* Convert normalized, scaled ADC values to lux. */
 416 static unsigned int tsl2563_adc_to_lux(u32 adc0, u32 adc1)
 417 {
 418         const struct tsl2563_lux_coeff *lp = lux_table;
 419         unsigned long ratio, lux, ch0 = adc0, ch1 = adc1;
 420 
 421         ratio = ch0 ? ((ch1 << ADC_FRAC_BITS) / ch0) : ULONG_MAX;
 422 
 423         while (lp->ch_ratio < ratio)
 424                 lp++;
 425 
 426         lux = ch0 * lp->ch0_coeff - ch1 * lp->ch1_coeff;
 427 
 428         return (unsigned int) (lux >> ADC_FRAC_BITS);
 429 }
 430 
 431 /* Apply calibration coefficient to ADC count. */
 432 static u32 tsl2563_calib_adc(u32 adc, u32 calib)
 433 {
 434         unsigned long scaled = adc;
 435 
 436         scaled *= calib;
 437         scaled >>= CALIB_FRAC_BITS;
 438 
 439         return (u32) scaled;
 440 }
 441 
 442 static int tsl2563_write_raw(struct iio_dev *indio_dev,
 443                                struct iio_chan_spec const *chan,
 444                                int val,
 445                                int val2,
 446                                long mask)
 447 {
 448         struct tsl2563_chip *chip = iio_priv(indio_dev);
 449 
 450         if (mask != IIO_CHAN_INFO_CALIBSCALE)
 451                 return -EINVAL;
 452         if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
 453                 chip->calib0 = tsl2563_calib_from_sysfs(val);
 454         else if (chan->channel2 == IIO_MOD_LIGHT_IR)
 455                 chip->calib1 = tsl2563_calib_from_sysfs(val);
 456         else
 457                 return -EINVAL;
 458 
 459         return 0;
 460 }
 461 
 462 static int tsl2563_read_raw(struct iio_dev *indio_dev,
 463                             struct iio_chan_spec const *chan,
 464                             int *val,
 465                             int *val2,
 466                             long mask)
 467 {
 468         int ret = -EINVAL;
 469         u32 calib0, calib1;
 470         struct tsl2563_chip *chip = iio_priv(indio_dev);
 471 
 472         mutex_lock(&chip->lock);
 473         switch (mask) {
 474         case IIO_CHAN_INFO_RAW:
 475         case IIO_CHAN_INFO_PROCESSED:
 476                 switch (chan->type) {
 477                 case IIO_LIGHT:
 478                         ret = tsl2563_get_adc(chip);
 479                         if (ret)
 480                                 goto error_ret;
 481                         calib0 = tsl2563_calib_adc(chip->data0, chip->calib0) *
 482                                 chip->cover_comp_gain;
 483                         calib1 = tsl2563_calib_adc(chip->data1, chip->calib1) *
 484                                 chip->cover_comp_gain;
 485                         *val = tsl2563_adc_to_lux(calib0, calib1);
 486                         ret = IIO_VAL_INT;
 487                         break;
 488                 case IIO_INTENSITY:
 489                         ret = tsl2563_get_adc(chip);
 490                         if (ret)
 491                                 goto error_ret;
 492                         if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
 493                                 *val = chip->data0;
 494                         else
 495                                 *val = chip->data1;
 496                         ret = IIO_VAL_INT;
 497                         break;
 498                 default:
 499                         break;
 500                 }
 501                 break;
 502 
 503         case IIO_CHAN_INFO_CALIBSCALE:
 504                 if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
 505                         *val = tsl2563_calib_to_sysfs(chip->calib0);
 506                 else
 507                         *val = tsl2563_calib_to_sysfs(chip->calib1);
 508                 ret = IIO_VAL_INT;
 509                 break;
 510         default:
 511                 ret = -EINVAL;
 512                 goto error_ret;
 513         }
 514 
 515 error_ret:
 516         mutex_unlock(&chip->lock);
 517         return ret;
 518 }
 519 
 520 static const struct iio_event_spec tsl2563_events[] = {
 521         {
 522                 .type = IIO_EV_TYPE_THRESH,
 523                 .dir = IIO_EV_DIR_RISING,
 524                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 525                                 BIT(IIO_EV_INFO_ENABLE),
 526         }, {
 527                 .type = IIO_EV_TYPE_THRESH,
 528                 .dir = IIO_EV_DIR_FALLING,
 529                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 530                                 BIT(IIO_EV_INFO_ENABLE),
 531         },
 532 };
 533 
 534 static const struct iio_chan_spec tsl2563_channels[] = {
 535         {
 536                 .type = IIO_LIGHT,
 537                 .indexed = 1,
 538                 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
 539                 .channel = 0,
 540         }, {
 541                 .type = IIO_INTENSITY,
 542                 .modified = 1,
 543                 .channel2 = IIO_MOD_LIGHT_BOTH,
 544                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 545                 BIT(IIO_CHAN_INFO_CALIBSCALE),
 546                 .event_spec = tsl2563_events,
 547                 .num_event_specs = ARRAY_SIZE(tsl2563_events),
 548         }, {
 549                 .type = IIO_INTENSITY,
 550                 .modified = 1,
 551                 .channel2 = IIO_MOD_LIGHT_IR,
 552                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 553                 BIT(IIO_CHAN_INFO_CALIBSCALE),
 554         }
 555 };
 556 
 557 static int tsl2563_read_thresh(struct iio_dev *indio_dev,
 558         const struct iio_chan_spec *chan, enum iio_event_type type,
 559         enum iio_event_direction dir, enum iio_event_info info, int *val,
 560         int *val2)
 561 {
 562         struct tsl2563_chip *chip = iio_priv(indio_dev);
 563 
 564         switch (dir) {
 565         case IIO_EV_DIR_RISING:
 566                 *val = chip->high_thres;
 567                 break;
 568         case IIO_EV_DIR_FALLING:
 569                 *val = chip->low_thres;
 570                 break;
 571         default:
 572                 return -EINVAL;
 573         }
 574 
 575         return IIO_VAL_INT;
 576 }
 577 
 578 static int tsl2563_write_thresh(struct iio_dev *indio_dev,
 579         const struct iio_chan_spec *chan, enum iio_event_type type,
 580         enum iio_event_direction dir, enum iio_event_info info, int val,
 581         int val2)
 582 {
 583         struct tsl2563_chip *chip = iio_priv(indio_dev);
 584         int ret;
 585         u8 address;
 586 
 587         if (dir == IIO_EV_DIR_RISING)
 588                 address = TSL2563_REG_HIGHLOW;
 589         else
 590                 address = TSL2563_REG_LOWLOW;
 591         mutex_lock(&chip->lock);
 592         ret = i2c_smbus_write_byte_data(chip->client, TSL2563_CMD | address,
 593                                         val & 0xFF);
 594         if (ret)
 595                 goto error_ret;
 596         ret = i2c_smbus_write_byte_data(chip->client,
 597                                         TSL2563_CMD | (address + 1),
 598                                         (val >> 8) & 0xFF);
 599         if (dir == IIO_EV_DIR_RISING)
 600                 chip->high_thres = val;
 601         else
 602                 chip->low_thres = val;
 603 
 604 error_ret:
 605         mutex_unlock(&chip->lock);
 606 
 607         return ret;
 608 }
 609 
 610 static irqreturn_t tsl2563_event_handler(int irq, void *private)
 611 {
 612         struct iio_dev *dev_info = private;
 613         struct tsl2563_chip *chip = iio_priv(dev_info);
 614 
 615         iio_push_event(dev_info,
 616                        IIO_UNMOD_EVENT_CODE(IIO_INTENSITY,
 617                                             0,
 618                                             IIO_EV_TYPE_THRESH,
 619                                             IIO_EV_DIR_EITHER),
 620                        iio_get_time_ns(dev_info));
 621 
 622         /* clear the interrupt and push the event */
 623         i2c_smbus_write_byte(chip->client, TSL2563_CMD | TSL2563_CLEARINT);
 624         return IRQ_HANDLED;
 625 }
 626 
 627 static int tsl2563_write_interrupt_config(struct iio_dev *indio_dev,
 628         const struct iio_chan_spec *chan, enum iio_event_type type,
 629         enum iio_event_direction dir, int state)
 630 {
 631         struct tsl2563_chip *chip = iio_priv(indio_dev);
 632         int ret = 0;
 633 
 634         mutex_lock(&chip->lock);
 635         if (state && !(chip->intr & 0x30)) {
 636                 chip->intr &= ~0x30;
 637                 chip->intr |= 0x10;
 638                 /* ensure the chip is actually on */
 639                 cancel_delayed_work(&chip->poweroff_work);
 640                 if (!tsl2563_get_power(chip)) {
 641                         ret = tsl2563_set_power(chip, 1);
 642                         if (ret)
 643                                 goto out;
 644                         ret = tsl2563_configure(chip);
 645                         if (ret)
 646                                 goto out;
 647                 }
 648                 ret = i2c_smbus_write_byte_data(chip->client,
 649                                                 TSL2563_CMD | TSL2563_REG_INT,
 650                                                 chip->intr);
 651                 chip->int_enabled = true;
 652         }
 653 
 654         if (!state && (chip->intr & 0x30)) {
 655                 chip->intr &= ~0x30;
 656                 ret = i2c_smbus_write_byte_data(chip->client,
 657                                                 TSL2563_CMD | TSL2563_REG_INT,
 658                                                 chip->intr);
 659                 chip->int_enabled = false;
 660                 /* now the interrupt is not enabled, we can go to sleep */
 661                 schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
 662         }
 663 out:
 664         mutex_unlock(&chip->lock);
 665 
 666         return ret;
 667 }
 668 
 669 static int tsl2563_read_interrupt_config(struct iio_dev *indio_dev,
 670         const struct iio_chan_spec *chan, enum iio_event_type type,
 671         enum iio_event_direction dir)
 672 {
 673         struct tsl2563_chip *chip = iio_priv(indio_dev);
 674         int ret;
 675 
 676         mutex_lock(&chip->lock);
 677         ret = i2c_smbus_read_byte_data(chip->client,
 678                                        TSL2563_CMD | TSL2563_REG_INT);
 679         mutex_unlock(&chip->lock);
 680         if (ret < 0)
 681                 return ret;
 682 
 683         return !!(ret & 0x30);
 684 }
 685 
 686 static const struct iio_info tsl2563_info_no_irq = {
 687         .read_raw = &tsl2563_read_raw,
 688         .write_raw = &tsl2563_write_raw,
 689 };
 690 
 691 static const struct iio_info tsl2563_info = {
 692         .read_raw = &tsl2563_read_raw,
 693         .write_raw = &tsl2563_write_raw,
 694         .read_event_value = &tsl2563_read_thresh,
 695         .write_event_value = &tsl2563_write_thresh,
 696         .read_event_config = &tsl2563_read_interrupt_config,
 697         .write_event_config = &tsl2563_write_interrupt_config,
 698 };
 699 
 700 static int tsl2563_probe(struct i2c_client *client,
 701                                 const struct i2c_device_id *device_id)
 702 {
 703         struct iio_dev *indio_dev;
 704         struct tsl2563_chip *chip;
 705         struct tsl2563_platform_data *pdata = client->dev.platform_data;
 706         struct device_node *np = client->dev.of_node;
 707         int err = 0;
 708         u8 id = 0;
 709 
 710         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
 711         if (!indio_dev)
 712                 return -ENOMEM;
 713 
 714         chip = iio_priv(indio_dev);
 715 
 716         i2c_set_clientdata(client, chip);
 717         chip->client = client;
 718 
 719         err = tsl2563_detect(chip);
 720         if (err) {
 721                 dev_err(&client->dev, "detect error %d\n", -err);
 722                 return err;
 723         }
 724 
 725         err = tsl2563_read_id(chip, &id);
 726         if (err) {
 727                 dev_err(&client->dev, "read id error %d\n", -err);
 728                 return err;
 729         }
 730 
 731         mutex_init(&chip->lock);
 732 
 733         /* Default values used until userspace says otherwise */
 734         chip->low_thres = 0x0;
 735         chip->high_thres = 0xffff;
 736         chip->gainlevel = tsl2563_gainlevel_table;
 737         chip->intr = TSL2563_INT_PERSIST(4);
 738         chip->calib0 = tsl2563_calib_from_sysfs(CALIB_BASE_SYSFS);
 739         chip->calib1 = tsl2563_calib_from_sysfs(CALIB_BASE_SYSFS);
 740 
 741         if (pdata)
 742                 chip->cover_comp_gain = pdata->cover_comp_gain;
 743         else if (np)
 744                 of_property_read_u32(np, "amstaos,cover-comp-gain",
 745                                      &chip->cover_comp_gain);
 746         else
 747                 chip->cover_comp_gain = 1;
 748 
 749         dev_info(&client->dev, "model %d, rev. %d\n", id >> 4, id & 0x0f);
 750         indio_dev->name = client->name;
 751         indio_dev->channels = tsl2563_channels;
 752         indio_dev->num_channels = ARRAY_SIZE(tsl2563_channels);
 753         indio_dev->dev.parent = &client->dev;
 754         indio_dev->modes = INDIO_DIRECT_MODE;
 755 
 756         if (client->irq)
 757                 indio_dev->info = &tsl2563_info;
 758         else
 759                 indio_dev->info = &tsl2563_info_no_irq;
 760 
 761         if (client->irq) {
 762                 err = devm_request_threaded_irq(&client->dev, client->irq,
 763                                            NULL,
 764                                            &tsl2563_event_handler,
 765                                            IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 766                                            "tsl2563_event",
 767                                            indio_dev);
 768                 if (err) {
 769                         dev_err(&client->dev, "irq request error %d\n", -err);
 770                         return err;
 771                 }
 772         }
 773 
 774         err = tsl2563_configure(chip);
 775         if (err) {
 776                 dev_err(&client->dev, "configure error %d\n", -err);
 777                 return err;
 778         }
 779 
 780         INIT_DELAYED_WORK(&chip->poweroff_work, tsl2563_poweroff_work);
 781 
 782         /* The interrupt cannot yet be enabled so this is fine without lock */
 783         schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
 784 
 785         err = iio_device_register(indio_dev);
 786         if (err) {
 787                 dev_err(&client->dev, "iio registration error %d\n", -err);
 788                 goto fail;
 789         }
 790 
 791         return 0;
 792 
 793 fail:
 794         cancel_delayed_work_sync(&chip->poweroff_work);
 795         return err;
 796 }
 797 
 798 static int tsl2563_remove(struct i2c_client *client)
 799 {
 800         struct tsl2563_chip *chip = i2c_get_clientdata(client);
 801         struct iio_dev *indio_dev = iio_priv_to_dev(chip);
 802 
 803         iio_device_unregister(indio_dev);
 804         if (!chip->int_enabled)
 805                 cancel_delayed_work(&chip->poweroff_work);
 806         /* Ensure that interrupts are disabled - then flush any bottom halves */
 807         chip->intr &= ~0x30;
 808         i2c_smbus_write_byte_data(chip->client, TSL2563_CMD | TSL2563_REG_INT,
 809                                   chip->intr);
 810         flush_scheduled_work();
 811         tsl2563_set_power(chip, 0);
 812 
 813         return 0;
 814 }
 815 
 816 #ifdef CONFIG_PM_SLEEP
 817 static int tsl2563_suspend(struct device *dev)
 818 {
 819         struct tsl2563_chip *chip = i2c_get_clientdata(to_i2c_client(dev));
 820         int ret;
 821 
 822         mutex_lock(&chip->lock);
 823 
 824         ret = tsl2563_set_power(chip, 0);
 825         if (ret)
 826                 goto out;
 827 
 828         chip->suspended = true;
 829 
 830 out:
 831         mutex_unlock(&chip->lock);
 832         return ret;
 833 }
 834 
 835 static int tsl2563_resume(struct device *dev)
 836 {
 837         struct tsl2563_chip *chip = i2c_get_clientdata(to_i2c_client(dev));
 838         int ret;
 839 
 840         mutex_lock(&chip->lock);
 841 
 842         ret = tsl2563_set_power(chip, 1);
 843         if (ret)
 844                 goto out;
 845 
 846         ret = tsl2563_configure(chip);
 847         if (ret)
 848                 goto out;
 849 
 850         chip->suspended = false;
 851 
 852 out:
 853         mutex_unlock(&chip->lock);
 854         return ret;
 855 }
 856 
 857 static SIMPLE_DEV_PM_OPS(tsl2563_pm_ops, tsl2563_suspend, tsl2563_resume);
 858 #define TSL2563_PM_OPS (&tsl2563_pm_ops)
 859 #else
 860 #define TSL2563_PM_OPS NULL
 861 #endif
 862 
 863 static const struct i2c_device_id tsl2563_id[] = {
 864         { "tsl2560", 0 },
 865         { "tsl2561", 1 },
 866         { "tsl2562", 2 },
 867         { "tsl2563", 3 },
 868         {}
 869 };
 870 MODULE_DEVICE_TABLE(i2c, tsl2563_id);
 871 
 872 static const struct of_device_id tsl2563_of_match[] = {
 873         { .compatible = "amstaos,tsl2560" },
 874         { .compatible = "amstaos,tsl2561" },
 875         { .compatible = "amstaos,tsl2562" },
 876         { .compatible = "amstaos,tsl2563" },
 877         {}
 878 };
 879 MODULE_DEVICE_TABLE(of, tsl2563_of_match);
 880 
 881 static struct i2c_driver tsl2563_i2c_driver = {
 882         .driver = {
 883                 .name    = "tsl2563",
 884                 .of_match_table = tsl2563_of_match,
 885                 .pm     = TSL2563_PM_OPS,
 886         },
 887         .probe          = tsl2563_probe,
 888         .remove         = tsl2563_remove,
 889         .id_table       = tsl2563_id,
 890 };
 891 module_i2c_driver(tsl2563_i2c_driver);
 892 
 893 MODULE_AUTHOR("Nokia Corporation");
 894 MODULE_DESCRIPTION("tsl2563 light sensor driver");
 895 MODULE_LICENSE("GPL");