drivers/staging/iio/light/tsl2563.c

   1 /*
   2  * drivers/i2c/chips/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/platform_device.h>
  35 #include <linux/pm.h>
  36 #include <linux/hwmon.h>
  37 #include <linux/err.h>
  38 #include <linux/slab.h>
  39
  40 #include "../iio.h"
  41 #include "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         struct work_struct      work_thresh;
 121         s64                     event_timestamp;
 122         /* Remember state for suspend and resume functions */
 123         pm_message_t            state;
 124
 125         struct tsl2563_gainlevel_coeff const *gainlevel;
 126
 127         u16                     low_thres;
 128         u16                     high_thres;
 129         u8                      intr;
 130         bool                    int_enabled;
 131
 132         /* Calibration coefficients */
 133         u32                     calib0;
 134         u32                     calib1;
 135         int                     cover_comp_gain;
 136
 137         /* Cache current values, to be returned while suspended */
 138         u32                     data0;
 139         u32                     data1;
 140 };
 141
 142 static int tsl2563_write(struct i2c_client *client, u8 reg, u8 value)
 143 {
 144         int ret;
 145         u8 buf[2];
 146
 147         buf[0] = TSL2563_CMD | reg;
 148         buf[1] = value;
 149
 150         ret = i2c_master_send(client, buf, sizeof(buf));
 151         return (ret == sizeof(buf)) ? 0 : ret;
 152 }
 153
 154 static int tsl2563_read(struct i2c_client *client, u8 reg, void *buf, int len)
 155 {
 156         int ret;
 157         u8 cmd = TSL2563_CMD | reg;
 158
 159         ret = i2c_master_send(client, &cmd, sizeof(cmd));
 160         if (ret != sizeof(cmd))
 161                 return ret;
 162
 163         return i2c_master_recv(client, buf, len);
 164 }
 165
 166 static int tsl2563_set_power(struct tsl2563_chip *chip, int on)
 167 {
 168         struct i2c_client *client = chip->client;
 169         u8 cmd;
 170
 171         cmd = on ? TSL2563_CMD_POWER_ON : TSL2563_CMD_POWER_OFF;
 172         return tsl2563_write(client, TSL2563_REG_CTRL, cmd);
 173 }
 174
 175 /*
 176  * Return value is 0 for off, 1 for on, or a negative error
 177  * code if reading failed.
 178  */
 179 static int tsl2563_get_power(struct tsl2563_chip *chip)
 180 {
 181         struct i2c_client *client = chip->client;
 182         int ret;
 183         u8 val;
 184
 185         ret = tsl2563_read(client, TSL2563_REG_CTRL, &val, sizeof(val));
 186         if (ret != sizeof(val))
 187                 return ret;
 188
 189         return (val & TSL2563_CTRL_POWER_MASK) == TSL2563_CMD_POWER_ON;
 190 }
 191
 192 static int tsl2563_configure(struct tsl2563_chip *chip)
 193 {
 194         int ret;
 195
 196         ret = tsl2563_write(chip->client, TSL2563_REG_TIMING,
 197                         chip->gainlevel->gaintime);
 198         if (ret)
 199                 goto error_ret;
 200         ret = tsl2563_write(chip->client, TSL2563_REG_HIGHLOW,
 201                         chip->high_thres & 0xFF);
 202         if (ret)
 203                 goto error_ret;
 204         ret = tsl2563_write(chip->client, TSL2563_REG_HIGHHIGH,
 205                         (chip->high_thres >> 8) & 0xFF);
 206         if (ret)
 207                 goto error_ret;
 208         ret = tsl2563_write(chip->client, TSL2563_REG_LOWLOW,
 209                         chip->low_thres & 0xFF);
 210         if (ret)
 211                 goto error_ret;
 212         ret = tsl2563_write(chip->client, TSL2563_REG_LOWHIGH,
 213                         (chip->low_thres >> 8) & 0xFF);
 214 /* Interrupt register is automatically written anyway if it is relevant
 215    so is not here */
 216 error_ret:
 217         return ret;
 218 }
 219
 220 static void tsl2563_poweroff_work(struct work_struct *work)
 221 {
 222         struct tsl2563_chip *chip =
 223                 container_of(work, struct tsl2563_chip, poweroff_work.work);
 224         tsl2563_set_power(chip, 0);
 225 }
 226
 227 static int tsl2563_detect(struct tsl2563_chip *chip)
 228 {
 229         int ret;
 230
 231         ret = tsl2563_set_power(chip, 1);
 232         if (ret)
 233                 return ret;
 234
 235         ret = tsl2563_get_power(chip);
 236         if (ret < 0)
 237                 return ret;
 238
 239         return ret ? 0 : -ENODEV;
 240 }
 241
 242 static int tsl2563_read_id(struct tsl2563_chip *chip, u8 *id)
 243 {
 244         struct i2c_client *client = chip->client;
 245         int ret;
 246
 247         ret = tsl2563_read(client, TSL2563_REG_ID, id, sizeof(*id));
 248         if (ret != sizeof(*id))
 249                 return ret;
 250
 251         return 0;
 252 }
 253
 254 /*
 255  * "Normalized" ADC value is one obtained with 400ms of integration time and
 256  * 16x gain. This function returns the number of bits of shift needed to
 257  * convert between normalized values and HW values obtained using given
 258  * timing and gain settings.
 259  */
 260 static int adc_shiftbits(u8 timing)
 261 {
 262         int shift = 0;
 263
 264         switch (timing & TSL2563_TIMING_MASK) {
 265         case TSL2563_TIMING_13MS:
 266                 shift += 5;
 267                 break;
 268         case TSL2563_TIMING_100MS:
 269                 shift += 2;
 270                 break;
 271         case TSL2563_TIMING_400MS:
 272                 /* no-op */
 273                 break;
 274         }
 275
 276         if (!(timing & TSL2563_TIMING_GAIN16))
 277                 shift += 4;
 278
 279         return shift;
 280 }
 281
 282 /* Convert a HW ADC value to normalized scale. */
 283 static u32 normalize_adc(u16 adc, u8 timing)
 284 {
 285         return adc << adc_shiftbits(timing);
 286 }
 287
 288 static void tsl2563_wait_adc(struct tsl2563_chip *chip)
 289 {
 290         unsigned int delay;
 291
 292         switch (chip->gainlevel->gaintime & TSL2563_TIMING_MASK) {
 293         case TSL2563_TIMING_13MS:
 294                 delay = 14;
 295                 break;
 296         case TSL2563_TIMING_100MS:
 297                 delay = 101;
 298                 break;
 299         default:
 300                 delay = 402;
 301         }
 302         /*
 303          * TODO: Make sure that we wait at least required delay but why we
 304          * have to extend it one tick more?
 305          */
 306         schedule_timeout_interruptible(msecs_to_jiffies(delay) + 2);
 307 }
 308
 309 static int tsl2563_adjust_gainlevel(struct tsl2563_chip *chip, u16 adc)
 310 {
 311         struct i2c_client *client = chip->client;
 312
 313         if (adc > chip->gainlevel->max || adc < chip->gainlevel->min) {
 314
 315                 (adc > chip->gainlevel->max) ?
 316                         chip->gainlevel++ : chip->gainlevel--;
 317
 318                 tsl2563_write(client, TSL2563_REG_TIMING,
 319                               chip->gainlevel->gaintime);
 320
 321                 tsl2563_wait_adc(chip);
 322                 tsl2563_wait_adc(chip);
 323
 324                 return 1;
 325         } else
 326                 return 0;
 327 }
 328
 329 static int tsl2563_get_adc(struct tsl2563_chip *chip)
 330 {
 331         struct i2c_client *client = chip->client;
 332         u8 buf0[2], buf1[2];
 333         u16 adc0, adc1;
 334         int retry = 1;
 335         int ret = 0;
 336
 337         if (chip->state.event != PM_EVENT_ON)
 338                 goto out;
 339
 340         if (!chip->int_enabled) {
 341                 cancel_delayed_work(&chip->poweroff_work);
 342
 343                 if (!tsl2563_get_power(chip)) {
 344                         ret = tsl2563_set_power(chip, 1);
 345                         if (ret)
 346                                 goto out;
 347                         ret = tsl2563_configure(chip);
 348                         if (ret)
 349                                 goto out;
 350                         tsl2563_wait_adc(chip);
 351                 }
 352         }
 353
 354         while (retry) {
 355                 ret = tsl2563_read(client,
 356                                    TSL2563_REG_DATA0LOW,
 357                                    buf0, sizeof(buf0));
 358                 if (ret != sizeof(buf0))
 359                         goto out;
 360
 361                 ret = tsl2563_read(client, TSL2563_REG_DATA1LOW,
 362                                    buf1, sizeof(buf1));
 363                 if (ret != sizeof(buf1))
 364                         goto out;
 365
 366                 adc0 = (buf0[1] << 8) + buf0[0];
 367                 adc1 = (buf1[1] << 8) + buf1[0];
 368
 369                 retry = tsl2563_adjust_gainlevel(chip, adc0);
 370         }
 371
 372         chip->data0 = normalize_adc(adc0, chip->gainlevel->gaintime);
 373         chip->data1 = normalize_adc(adc1, chip->gainlevel->gaintime);
 374
 375         if (!chip->int_enabled)
 376                 schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
 377
 378         ret = 0;
 379 out:
 380         return ret;
 381 }
 382
 383 static inline int calib_to_sysfs(u32 calib)
 384 {
 385         return (int) (((calib * CALIB_BASE_SYSFS) +
 386                        CALIB_FRAC_HALF) >> CALIB_FRAC_BITS);
 387 }
 388
 389 static inline u32 calib_from_sysfs(int value)
 390 {
 391         return (((u32) value) << CALIB_FRAC_BITS) / CALIB_BASE_SYSFS;
 392 }
 393
 394 /*
 395  * Conversions between lux and ADC values.
 396  *
 397  * The basic formula is lux = c0 * adc0 - c1 * adc1, where c0 and c1 are
 398  * appropriate constants. Different constants are needed for different
 399  * kinds of light, determined by the ratio adc1/adc0 (basically the ratio
 400  * of the intensities in infrared and visible wavelengths). lux_table below
 401  * lists the upper threshold of the adc1/adc0 ratio and the corresponding
 402  * constants.
 403  */
 404
 405 struct tsl2563_lux_coeff {
 406         unsigned long ch_ratio;
 407         unsigned long ch0_coeff;
 408         unsigned long ch1_coeff;
 409 };
 410
 411 static const struct tsl2563_lux_coeff lux_table[] = {
 412         {
 413                 .ch_ratio       = FRAC10K(1300),
 414                 .ch0_coeff      = FRAC10K(315),
 415                 .ch1_coeff      = FRAC10K(262),
 416         }, {
 417                 .ch_ratio       = FRAC10K(2600),
 418                 .ch0_coeff      = FRAC10K(337),
 419                 .ch1_coeff      = FRAC10K(430),
 420         }, {
 421                 .ch_ratio       = FRAC10K(3900),
 422                 .ch0_coeff      = FRAC10K(363),
 423                 .ch1_coeff      = FRAC10K(529),
 424         }, {
 425                 .ch_ratio       = FRAC10K(5200),
 426                 .ch0_coeff      = FRAC10K(392),
 427                 .ch1_coeff      = FRAC10K(605),
 428         }, {
 429                 .ch_ratio       = FRAC10K(6500),
 430                 .ch0_coeff      = FRAC10K(229),
 431                 .ch1_coeff      = FRAC10K(291),
 432         }, {
 433                 .ch_ratio       = FRAC10K(8000),
 434                 .ch0_coeff      = FRAC10K(157),
 435                 .ch1_coeff      = FRAC10K(180),
 436         }, {
 437                 .ch_ratio       = FRAC10K(13000),
 438                 .ch0_coeff      = FRAC10K(34),
 439                 .ch1_coeff      = FRAC10K(26),
 440         }, {
 441                 .ch_ratio       = ULONG_MAX,
 442                 .ch0_coeff      = 0,
 443                 .ch1_coeff      = 0,
 444         },
 445 };
 446
 447 /*
 448  * Convert normalized, scaled ADC values to lux.
 449  */
 450 static unsigned int adc_to_lux(u32 adc0, u32 adc1)
 451 {
 452         const struct tsl2563_lux_coeff *lp = lux_table;
 453         unsigned long ratio, lux, ch0 = adc0, ch1 = adc1;
 454
 455         ratio = ch0 ? ((ch1 << ADC_FRAC_BITS) / ch0) : ULONG_MAX;
 456
 457         while (lp->ch_ratio < ratio)
 458                 lp++;
 459
 460         lux = ch0 * lp->ch0_coeff - ch1 * lp->ch1_coeff;
 461
 462         return (unsigned int) (lux >> ADC_FRAC_BITS);
 463 }
 464
 465 /*--------------------------------------------------------------*/
 466 /*                      Sysfs interface                         */
 467 /*--------------------------------------------------------------*/
 468
 469 static ssize_t tsl2563_adc_show(struct device *dev,
 470                                 struct device_attribute *attr, char *buf)
 471 {
 472         struct tsl2563_chip *chip = iio_priv(dev_get_drvdata(dev));
 473         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 474         int ret;
 475
 476         mutex_lock(&chip->lock);
 477
 478         ret = tsl2563_get_adc(chip);
 479         if (ret)
 480                 goto out;
 481
 482         switch (this_attr->address) {
 483         case 0:
 484                 ret = snprintf(buf, PAGE_SIZE, "%d\n", chip->data0);
 485                 break;
 486         case 1:
 487                 ret = snprintf(buf, PAGE_SIZE, "%d\n", chip->data1);
 488                 break;
 489         }
 490 out:
 491         mutex_unlock(&chip->lock);
 492         return ret;
 493 }
 494
 495 /* Apply calibration coefficient to ADC count. */
 496 static u32 calib_adc(u32 adc, u32 calib)
 497 {
 498         unsigned long scaled = adc;
 499
 500         scaled *= calib;
 501         scaled >>= CALIB_FRAC_BITS;
 502
 503         return (u32) scaled;
 504 }
 505
 506 static ssize_t tsl2563_lux_show(struct device *dev,
 507                                 struct device_attribute *attr, char *buf)
 508 {
 509         struct tsl2563_chip *chip = iio_priv(dev_get_drvdata(dev));
 510         u32 calib0, calib1;
 511         int ret;
 512
 513         mutex_lock(&chip->lock);
 514
 515         ret = tsl2563_get_adc(chip);
 516         if (ret)
 517                 goto out;
 518
 519         calib0 = calib_adc(chip->data0, chip->calib0) * chip->cover_comp_gain;
 520         calib1 = calib_adc(chip->data1, chip->calib1) * chip->cover_comp_gain;
 521
 522         ret = snprintf(buf, PAGE_SIZE, "%d\n", adc_to_lux(calib0, calib1));
 523
 524 out:
 525         mutex_unlock(&chip->lock);
 526         return ret;
 527 }
 528
 529 static ssize_t format_calib(char *buf, int len, u32 calib)
 530 {
 531         return snprintf(buf, PAGE_SIZE, "%d\n", calib_to_sysfs(calib));
 532 }
 533
 534 static ssize_t tsl2563_calib_show(struct device *dev,
 535                                 struct device_attribute *attr, char *buf)
 536 {
 537         struct tsl2563_chip *chip = iio_priv(dev_get_drvdata(dev));
 538         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 539         int ret;
 540
 541         mutex_lock(&chip->lock);
 542         switch (this_attr->address) {
 543         case 0:
 544                 ret = format_calib(buf, PAGE_SIZE, chip->calib0);
 545                 break;
 546         case 1:
 547                 ret = format_calib(buf, PAGE_SIZE, chip->calib1);
 548                 break;
 549         default:
 550                 ret = -ENODEV;
 551         }
 552         mutex_unlock(&chip->lock);
 553         return ret;
 554 }
 555
 556 static ssize_t tsl2563_calib_store(struct device *dev,
 557                                 struct device_attribute *attr,
 558                                 const char *buf, size_t len)
 559 {
 560         struct tsl2563_chip *chip = iio_priv(dev_get_drvdata(dev));
 561         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 562         int value;
 563         u32 calib;
 564
 565         if (1 != sscanf(buf, "%d", &value))
 566                 return -EINVAL;
 567
 568         calib = calib_from_sysfs(value);
 569
 570         switch (this_attr->address) {
 571         case 0:
 572                 chip->calib0 = calib;
 573                 break;
 574         case 1:
 575                 chip->calib1 = calib;
 576                 break;
 577         }
 578
 579         return len;
 580 }
 581
 582 static IIO_DEVICE_ATTR(intensity0_both_raw, S_IRUGO,
 583                 tsl2563_adc_show, NULL, 0);
 584 static IIO_DEVICE_ATTR(intensity1_ir_raw, S_IRUGO,
 585                 tsl2563_adc_show, NULL, 1);
 586 static DEVICE_ATTR(illuminance0_input, S_IRUGO, tsl2563_lux_show, NULL);
 587 static IIO_DEVICE_ATTR(intensity0_both_calibgain, S_IRUGO | S_IWUSR,
 588                 tsl2563_calib_show, tsl2563_calib_store, 0);
 589 static IIO_DEVICE_ATTR(intensity1_ir_calibgain, S_IRUGO | S_IWUSR,
 590                 tsl2563_calib_show, tsl2563_calib_store, 1);
 591
 592 static ssize_t tsl2563_show_name(struct device *dev,
 593                                 struct device_attribute *attr,
 594                                 char *buf)
 595 {
 596         struct tsl2563_chip *chip = iio_priv(dev_get_drvdata(dev));
 597         return sprintf(buf, "%s\n", chip->client->name);
 598 }
 599
 600 static DEVICE_ATTR(name, S_IRUGO, tsl2563_show_name, NULL);
 601
 602 static struct attribute *tsl2563_attributes[] = {
 603         &iio_dev_attr_intensity0_both_raw.dev_attr.attr,
 604         &iio_dev_attr_intensity1_ir_raw.dev_attr.attr,
 605         &dev_attr_illuminance0_input.attr,
 606         &iio_dev_attr_intensity0_both_calibgain.dev_attr.attr,
 607         &iio_dev_attr_intensity1_ir_calibgain.dev_attr.attr,
 608         &dev_attr_name.attr,
 609         NULL
 610 };
 611
 612 static const struct attribute_group tsl2563_group = {
 613         .attrs = tsl2563_attributes,
 614 };
 615
 616 static ssize_t tsl2563_read_thresh(struct device *dev,
 617                         struct device_attribute *attr,
 618                         char *buf)
 619 {
 620         struct tsl2563_chip *chip = iio_priv(dev_get_drvdata(dev));
 621         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 622         u16 val = 0;
 623         switch (this_attr->address) {
 624         case TSL2563_REG_HIGHLOW:
 625                 val = chip->high_thres;
 626                 break;
 627         case TSL2563_REG_LOWLOW:
 628                 val = chip->low_thres;
 629                 break;
 630         }
 631         return snprintf(buf, PAGE_SIZE, "%d\n", val);
 632 }
 633
 634 static ssize_t tsl2563_write_thresh(struct device *dev,
 635                                 struct device_attribute *attr,
 636                                 const char *buf,
 637                                 size_t len)
 638 {
 639         struct tsl2563_chip *chip = iio_priv(dev_get_drvdata(dev));
 640         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 641         unsigned long val;
 642         int ret;
 643
 644         ret = strict_strtoul(buf, 10, &val);
 645         if (ret)
 646                 return ret;
 647         mutex_lock(&chip->lock);
 648         ret = tsl2563_write(chip->client, this_attr->address, val & 0xFF);
 649         if (ret)
 650                 goto error_ret;
 651         ret = tsl2563_write(chip->client, this_attr->address + 1,
 652                         (val >> 8) & 0xFF);
 653         switch (this_attr->address) {
 654         case TSL2563_REG_HIGHLOW:
 655                 chip->high_thres = val;
 656                 break;
 657         case TSL2563_REG_LOWLOW:
 658                 chip->low_thres = val;
 659                 break;
 660         }
 661
 662 error_ret:
 663         mutex_unlock(&chip->lock);
 664
 665         return ret < 0 ? ret : len;
 666 }
 667
 668 static IIO_DEVICE_ATTR(intensity0_both_raw_thresh_rising_value,
 669                 S_IRUGO | S_IWUSR,
 670                 tsl2563_read_thresh,
 671                 tsl2563_write_thresh,
 672                 TSL2563_REG_HIGHLOW);
 673
 674 static IIO_DEVICE_ATTR(intensity0_both_raw_thresh_falling_value,
 675                 S_IRUGO | S_IWUSR,
 676                 tsl2563_read_thresh,
 677                 tsl2563_write_thresh,
 678                 TSL2563_REG_LOWLOW);
 679
 680 static int tsl2563_int_th(struct iio_dev *dev_info,
 681                         int index,
 682                         s64 timestamp,
 683                         int not_test)
 684 {
 685         struct tsl2563_chip *chip = iio_priv(dev_info);
 686
 687         chip->event_timestamp = timestamp;
 688         schedule_work(&chip->work_thresh);
 689
 690         return 0;
 691 }
 692
 693 static void tsl2563_int_bh(struct work_struct *work_s)
 694 {
 695         struct tsl2563_chip *chip
 696                 = container_of(work_s,
 697                         struct tsl2563_chip, work_thresh);
 698         u8 cmd = TSL2563_CMD | TSL2563_CLEARINT;
 699
 700         iio_push_event(iio_priv_to_dev(chip), 0,
 701                        IIO_UNMOD_EVENT_CODE(IIO_EV_CLASS_LIGHT,
 702                                             0,
 703                                             IIO_EV_TYPE_THRESH,
 704                                             IIO_EV_DIR_EITHER),
 705                        chip->event_timestamp);
 706
 707         /* reenable_irq */
 708         enable_irq(chip->client->irq);
 709         /* clear the interrupt and push the event */
 710         i2c_master_send(chip->client, &cmd, sizeof(cmd));
 711
 712 }
 713
 714 static ssize_t tsl2563_write_interrupt_config(struct device *dev,
 715                                         struct device_attribute *attr,
 716                                         const char *buf,
 717                                         size_t len)
 718 {
 719         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 720         struct tsl2563_chip *chip = iio_priv(indio_dev);
 721         struct iio_event_attr *this_attr = to_iio_event_attr(attr);
 722         int input, ret = 0;
 723
 724         ret = sscanf(buf, "%d", &input);
 725         if (ret != 1)
 726                 return -EINVAL;
 727         mutex_lock(&chip->lock);
 728         if (input && !(chip->intr & 0x30)) {
 729                 iio_add_event_to_list(this_attr->listel,
 730                                 &indio_dev->interrupts[0]->ev_list);
 731                 chip->intr &= ~0x30;
 732                 chip->intr |= 0x10;
 733                 /* ensure the chip is actually on */
 734                 cancel_delayed_work(&chip->poweroff_work);
 735                 if (!tsl2563_get_power(chip)) {
 736                         ret = tsl2563_set_power(chip, 1);
 737                         if (ret)
 738                                 goto out;
 739                         ret = tsl2563_configure(chip);
 740                         if (ret)
 741                                 goto out;
 742                 }
 743                 ret = tsl2563_write(chip->client, TSL2563_REG_INT, chip->intr);
 744                 chip->int_enabled = true;
 745         }
 746
 747         if (!input && (chip->intr & 0x30)) {
 748                 chip->intr |= ~0x30;
 749                 ret = tsl2563_write(chip->client, TSL2563_REG_INT, chip->intr);
 750                 iio_remove_event_from_list(this_attr->listel,
 751                                         &indio_dev->interrupts[0]->ev_list);
 752                 chip->int_enabled = false;
 753                 /* now the interrupt is not enabled, we can go to sleep */
 754                 schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
 755         }
 756 out:
 757         mutex_unlock(&chip->lock);
 758
 759         return (ret < 0) ? ret : len;
 760 }
 761
 762 static ssize_t tsl2563_read_interrupt_config(struct device *dev,
 763                                         struct device_attribute *attr,
 764                                         char *buf)
 765 {
 766         struct tsl2563_chip *chip = iio_priv(dev_get_drvdata(dev));
 767         int ret;
 768         u8 rxbuf;
 769         ssize_t len;
 770
 771         mutex_lock(&chip->lock);
 772         ret = tsl2563_read(chip->client,
 773                         TSL2563_REG_INT,
 774                         &rxbuf,
 775                         sizeof(rxbuf));
 776         mutex_unlock(&chip->lock);
 777         if (ret < 0)
 778                 goto error_ret;
 779         len = snprintf(buf, PAGE_SIZE, "%d\n", !!(rxbuf & 0x30));
 780 error_ret:
 781
 782         return (ret < 0) ? ret : len;
 783 }
 784
 785 IIO_EVENT_ATTR(intensity0_both_thresh_en,
 786         tsl2563_read_interrupt_config,
 787         tsl2563_write_interrupt_config,
 788         0,
 789         tsl2563_int_th);
 790
 791 static struct attribute *tsl2563_event_attributes[] = {
 792         &iio_event_attr_intensity0_both_thresh_en.dev_attr.attr,
 793         &iio_dev_attr_intensity0_both_raw_thresh_rising_value.dev_attr.attr,
 794         &iio_dev_attr_intensity0_both_raw_thresh_falling_value.dev_attr.attr,
 795         NULL,
 796 };
 797
 798 static struct attribute_group tsl2563_event_attribute_group = {
 799         .attrs = tsl2563_event_attributes,
 800 };
 801
 802 /*--------------------------------------------------------------*/
 803 /*                      Probe, Attach, Remove                   */
 804 /*--------------------------------------------------------------*/
 805 static struct i2c_driver tsl2563_i2c_driver;
 806
 807 static int __devinit tsl2563_probe(struct i2c_client *client,
 808                                 const struct i2c_device_id *device_id)
 809 {
 810         struct iio_dev *indio_dev;
 811         struct tsl2563_chip *chip;
 812         struct tsl2563_platform_data *pdata = client->dev.platform_data;
 813         int err = 0;
 814         int ret;
 815         u8 id;
 816
 817         indio_dev = iio_allocate_device(sizeof(*chip));
 818         if (!indio_dev)
 819                 return -ENOMEM;
 820
 821         chip = iio_priv(indio_dev);
 822
 823         INIT_WORK(&chip->work_thresh, tsl2563_int_bh);
 824         i2c_set_clientdata(client, chip);
 825         chip->client = client;
 826
 827         err = tsl2563_detect(chip);
 828         if (err) {
 829                 dev_err(&client->dev, "device not found, error %d\n", -err);
 830                 goto fail1;
 831         }
 832
 833         err = tsl2563_read_id(chip, &id);
 834         if (err)
 835                 goto fail1;
 836
 837         mutex_init(&chip->lock);
 838
 839         /* Default values used until userspace says otherwise */
 840         chip->low_thres = 0x0;
 841         chip->high_thres = 0xffff;
 842         chip->gainlevel = tsl2563_gainlevel_table;
 843         chip->intr = TSL2563_INT_PERSIST(4);
 844         chip->calib0 = calib_from_sysfs(CALIB_BASE_SYSFS);
 845         chip->calib1 = calib_from_sysfs(CALIB_BASE_SYSFS);
 846
 847         if (pdata)
 848                 chip->cover_comp_gain = pdata->cover_comp_gain;
 849         else
 850                 chip->cover_comp_gain = 1;
 851
 852         dev_info(&client->dev, "model %d, rev. %d\n", id >> 4, id & 0x0f);
 853
 854         indio_dev->attrs = &tsl2563_group;
 855         indio_dev->dev.parent = &client->dev;
 856         indio_dev->driver_module = THIS_MODULE;
 857         indio_dev->modes = INDIO_DIRECT_MODE;
 858         if (client->irq) {
 859                 indio_dev->num_interrupt_lines = 1;
 860                 indio_dev->event_attrs
 861                         = &tsl2563_event_attribute_group;
 862         }
 863         ret = iio_device_register(indio_dev);
 864         if (ret)
 865                 goto fail1;
 866
 867         if (client->irq) {
 868                 ret = iio_register_interrupt_line(client->irq,
 869                                                 indio_dev,
 870                                                 0,
 871                                                 IRQF_TRIGGER_RISING,
 872                                                 client->name);
 873                 if (ret)
 874                         goto fail2;
 875         }
 876         err = tsl2563_configure(chip);
 877         if (err)
 878                 goto fail3;
 879
 880         INIT_DELAYED_WORK(&chip->poweroff_work, tsl2563_poweroff_work);
 881         /* The interrupt cannot yet be enabled so this is fine without lock */
 882         schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
 883
 884         return 0;
 885 fail3:
 886         if (client->irq)
 887                 iio_unregister_interrupt_line(indio_dev, 0);
 888 fail2:
 889         iio_device_unregister(indio_dev);
 890 fail1:
 891         kfree(chip);
 892         return err;
 893 }
 894
 895 static int tsl2563_remove(struct i2c_client *client)
 896 {
 897         struct tsl2563_chip *chip = i2c_get_clientdata(client);
 898         struct iio_dev *indio_dev = iio_priv_to_dev(chip);
 899         if (!chip->int_enabled)
 900                 cancel_delayed_work(&chip->poweroff_work);
 901         /* Ensure that interrupts are disabled - then flush any bottom halves */
 902         chip->intr |= ~0x30;
 903         tsl2563_write(chip->client, TSL2563_REG_INT, chip->intr);
 904         flush_scheduled_work();
 905         tsl2563_set_power(chip, 0);
 906         if (client->irq)
 907                 iio_unregister_interrupt_line(indio_dev, 0);
 908         iio_device_unregister(indio_dev);
 909
 910         return 0;
 911 }
 912
 913 static int tsl2563_suspend(struct i2c_client *client, pm_message_t state)
 914 {
 915         struct tsl2563_chip *chip = i2c_get_clientdata(client);
 916         int ret;
 917
 918         mutex_lock(&chip->lock);
 919
 920         ret = tsl2563_set_power(chip, 0);
 921         if (ret)
 922                 goto out;
 923
 924         chip->state = state;
 925
 926 out:
 927         mutex_unlock(&chip->lock);
 928         return ret;
 929 }
 930
 931 static int tsl2563_resume(struct i2c_client *client)
 932 {
 933         struct tsl2563_chip *chip = i2c_get_clientdata(client);
 934         int ret;
 935
 936         mutex_lock(&chip->lock);
 937
 938         ret = tsl2563_set_power(chip, 1);
 939         if (ret)
 940                 goto out;
 941
 942         ret = tsl2563_configure(chip);
 943         if (ret)
 944                 goto out;
 945
 946         chip->state.event = PM_EVENT_ON;
 947
 948 out:
 949         mutex_unlock(&chip->lock);
 950         return ret;
 951 }
 952
 953 static const struct i2c_device_id tsl2563_id[] = {
 954         { "tsl2560", 0 },
 955         { "tsl2561", 1 },
 956         { "tsl2562", 2 },
 957         { "tsl2563", 3 },
 958         {}
 959 };
 960 MODULE_DEVICE_TABLE(i2c, tsl2563_id);
 961
 962 static struct i2c_driver tsl2563_i2c_driver = {
 963         .driver = {
 964                 .name    = "tsl2563",
 965         },
 966         .suspend        = tsl2563_suspend,
 967         .resume         = tsl2563_resume,
 968         .probe          = tsl2563_probe,
 969         .remove         = __devexit_p(tsl2563_remove),
 970         .id_table       = tsl2563_id,
 971 };
 972
 973 static int __init tsl2563_init(void)
 974 {
 975         return i2c_add_driver(&tsl2563_i2c_driver);
 976 }
 977
 978 static void __exit tsl2563_exit(void)
 979 {
 980         i2c_del_driver(&tsl2563_i2c_driver);
 981 }
 982
 983 MODULE_AUTHOR("Nokia Corporation");
 984 MODULE_DESCRIPTION("tsl2563 light sensor driver");
 985 MODULE_LICENSE("GPL");
 986
 987 module_init(tsl2563_init);
 988 module_exit(tsl2563_exit);