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 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 iio_dev          *indio_dev;
 119         struct delayed_work     poweroff_work;
 120
 121         struct work_struct      work_thresh;
 122         s64                     event_timestamp;
 123         /* Remember state for suspend and resume functions */
 124         pm_message_t            state;
 125
 126         struct tsl2563_gainlevel_coeff *gainlevel;
 127
 128         u16                     low_thres;
 129         u16                     high_thres;
 130         u8                      intr;
 131         bool                    int_enabled;
 132
 133         /* Calibration coefficients */
 134         u32                     calib0;
 135         u32                     calib1;
 136         int                     cover_comp_gain;
 137
 138         /* Cache current values, to be returned while suspended */
 139         u32                     data0;
 140         u32                     data1;
 141 };
 142
 143 static int tsl2563_write(struct i2c_client *client, u8 reg, u8 value)
 144 {
 145         int ret;
 146         u8 buf[2];
 147
 148         buf[0] = TSL2563_CMD | reg;
 149         buf[1] = value;
 150
 151         ret = i2c_master_send(client, buf, sizeof(buf));
 152         return (ret == sizeof(buf)) ? 0 : ret;
 153 }
 154
 155 static int tsl2563_read(struct i2c_client *client, u8 reg, void *buf, int len)
 156 {
 157         int ret;
 158         u8 cmd = TSL2563_CMD | reg;
 159
 160         ret = i2c_master_send(client, &cmd, sizeof(cmd));
 161         if (ret != sizeof(cmd))
 162                 return ret;
 163
 164         return i2c_master_recv(client, buf, len);
 165 }
 166
 167 static int tsl2563_set_power(struct tsl2563_chip *chip, int on)
 168 {
 169         struct i2c_client *client = chip->client;
 170         u8 cmd;
 171
 172         cmd = on ? TSL2563_CMD_POWER_ON : TSL2563_CMD_POWER_OFF;
 173         return tsl2563_write(client, TSL2563_REG_CTRL, cmd);
 174 }
 175
 176 /*
 177  * Return value is 0 for off, 1 for on, or a negative error
 178  * code if reading failed.
 179  */
 180 static int tsl2563_get_power(struct tsl2563_chip *chip)
 181 {
 182         struct i2c_client *client = chip->client;
 183         int ret;
 184         u8 val;
 185
 186         ret = tsl2563_read(client, TSL2563_REG_CTRL, &val, sizeof(val));
 187         if (ret != sizeof(val))
 188                 return ret;
 189
 190         return (val & TSL2563_CTRL_POWER_MASK) == TSL2563_CMD_POWER_ON;
 191 }
 192
 193 static int tsl2563_configure(struct tsl2563_chip *chip)
 194 {
 195         int ret;
 196
 197         ret = tsl2563_write(chip->client, TSL2563_REG_TIMING,
 198                         chip->gainlevel->gaintime);
 199         if (ret)
 200                 goto error_ret;
 201         ret = tsl2563_write(chip->client, TSL2563_REG_HIGHLOW,
 202                         chip->high_thres & 0xFF);
 203         if (ret)
 204                 goto error_ret;
 205         ret = tsl2563_write(chip->client, TSL2563_REG_HIGHHIGH,
 206                         (chip->high_thres >> 8) & 0xFF);
 207         if (ret)
 208                 goto error_ret;
 209         ret = tsl2563_write(chip->client, TSL2563_REG_LOWLOW,
 210                         chip->low_thres & 0xFF);
 211         if (ret)
 212                 goto error_ret;
 213         ret = tsl2563_write(chip->client, TSL2563_REG_LOWHIGH,
 214                         (chip->low_thres >> 8) & 0xFF);
 215 /* Interrupt register is automatically written anyway if it is relevant
 216    so is not here */
 217 error_ret:
 218         return ret;
 219 }
 220
 221 static void tsl2563_poweroff_work(struct work_struct *work)
 222 {
 223         struct tsl2563_chip *chip =
 224                 container_of(work, struct tsl2563_chip, poweroff_work.work);
 225         tsl2563_set_power(chip, 0);
 226 }
 227
 228 static int tsl2563_detect(struct tsl2563_chip *chip)
 229 {
 230         int ret;
 231
 232         ret = tsl2563_set_power(chip, 1);
 233         if (ret)
 234                 return ret;
 235
 236         ret = tsl2563_get_power(chip);
 237         if (ret < 0)
 238                 return ret;
 239
 240         return ret ? 0 : -ENODEV;
 241 }
 242
 243 static int tsl2563_read_id(struct tsl2563_chip *chip, u8 *id)
 244 {
 245         struct i2c_client *client = chip->client;
 246         int ret;
 247
 248         ret = tsl2563_read(client, TSL2563_REG_ID, id, sizeof(*id));
 249         if (ret != sizeof(*id))
 250                 return ret;
 251
 252         return 0;
 253 }
 254
 255 /*
 256  * "Normalized" ADC value is one obtained with 400ms of integration time and
 257  * 16x gain. This function returns the number of bits of shift needed to
 258  * convert between normalized values and HW values obtained using given
 259  * timing and gain settings.
 260  */
 261 static int adc_shiftbits(u8 timing)
 262 {
 263         int shift = 0;
 264
 265         switch (timing & TSL2563_TIMING_MASK) {
 266         case TSL2563_TIMING_13MS:
 267                 shift += 5;
 268                 break;
 269         case TSL2563_TIMING_100MS:
 270                 shift += 2;
 271                 break;
 272         case TSL2563_TIMING_400MS:
 273                 /* no-op */
 274                 break;
 275         }
 276
 277         if (!(timing & TSL2563_TIMING_GAIN16))
 278                 shift += 4;
 279
 280         return shift;
 281 }
 282
 283 /* Convert a HW ADC value to normalized scale. */
 284 static u32 normalize_adc(u16 adc, u8 timing)
 285 {
 286         return adc << adc_shiftbits(timing);
 287 }
 288
 289 static void tsl2563_wait_adc(struct tsl2563_chip *chip)
 290 {
 291         unsigned int delay;
 292
 293         switch (chip->gainlevel->gaintime & TSL2563_TIMING_MASK) {
 294         case TSL2563_TIMING_13MS:
 295                 delay = 14;
 296                 break;
 297         case TSL2563_TIMING_100MS:
 298                 delay = 101;
 299                 break;
 300         default:
 301                 delay = 402;
 302         }
 303         /*
 304          * TODO: Make sure that we wait at least required delay but why we
 305          * have to extend it one tick more?
 306          */
 307         schedule_timeout_interruptible(msecs_to_jiffies(delay) + 2);
 308 }
 309
 310 static int tsl2563_adjust_gainlevel(struct tsl2563_chip *chip, u16 adc)
 311 {
 312         struct i2c_client *client = chip->client;
 313
 314         if (adc > chip->gainlevel->max || adc < chip->gainlevel->min) {
 315
 316                 (adc > chip->gainlevel->max) ?
 317                         chip->gainlevel++ : chip->gainlevel--;
 318
 319                 tsl2563_write(client, TSL2563_REG_TIMING,
 320                               chip->gainlevel->gaintime);
 321
 322                 tsl2563_wait_adc(chip);
 323                 tsl2563_wait_adc(chip);
 324
 325                 return 1;
 326         } else
 327                 return 0;
 328 }
 329
 330 static int tsl2563_get_adc(struct tsl2563_chip *chip)
 331 {
 332         struct i2c_client *client = chip->client;
 333         u8 buf0[2], buf1[2];
 334         u16 adc0, adc1;
 335         int retry = 1;
 336         int ret = 0;
 337
 338         if (chip->state.event != PM_EVENT_ON)
 339                 goto out;
 340
 341         if (!chip->int_enabled) {
 342                 cancel_delayed_work(&chip->poweroff_work);
 343
 344                 if (!tsl2563_get_power(chip)) {
 345                         ret = tsl2563_set_power(chip, 1);
 346                         if (ret)
 347                                 goto out;
 348                         ret = tsl2563_configure(chip);
 349                         if (ret)
 350                                 goto out;
 351                         tsl2563_wait_adc(chip);
 352                 }
 353         }
 354
 355         while (retry) {
 356                 ret = tsl2563_read(client,
 357                                    TSL2563_REG_DATA0LOW,
 358                                    buf0, sizeof(buf0));
 359                 if (ret != sizeof(buf0))
 360                         goto out;
 361
 362                 ret = tsl2563_read(client, TSL2563_REG_DATA1LOW,
 363                                    buf1, sizeof(buf1));
 364                 if (ret != sizeof(buf1))
 365                         goto out;
 366
 367                 adc0 = (buf0[1] << 8) + buf0[0];
 368                 adc1 = (buf1[1] << 8) + buf1[0];
 369
 370                 retry = tsl2563_adjust_gainlevel(chip, adc0);
 371         }
 372
 373         chip->data0 = normalize_adc(adc0, chip->gainlevel->gaintime);
 374         chip->data1 = normalize_adc(adc1, chip->gainlevel->gaintime);
 375
 376         if (!chip->int_enabled)
 377                 schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
 378
 379         ret = 0;
 380 out:
 381         return ret;
 382 }
 383
 384 static inline int calib_to_sysfs(u32 calib)
 385 {
 386         return (int) (((calib * CALIB_BASE_SYSFS) +
 387                        CALIB_FRAC_HALF) >> CALIB_FRAC_BITS);
 388 }
 389
 390 static inline u32 calib_from_sysfs(int value)
 391 {
 392         return (((u32) value) << CALIB_FRAC_BITS) / CALIB_BASE_SYSFS;
 393 }
 394
 395 /*
 396  * Conversions between lux and ADC values.
 397  *
 398  * The basic formula is lux = c0 * adc0 - c1 * adc1, where c0 and c1 are
 399  * appropriate constants. Different constants are needed for different
 400  * kinds of light, determined by the ratio adc1/adc0 (basically the ratio
 401  * of the intensities in infrared and visible wavelengths). lux_table below
 402  * lists the upper threshold of the adc1/adc0 ratio and the corresponding
 403  * constants.
 404  */
 405
 406 struct tsl2563_lux_coeff {
 407         unsigned long ch_ratio;
 408         unsigned long ch0_coeff;
 409         unsigned long ch1_coeff;
 410 };
 411
 412 static const struct tsl2563_lux_coeff lux_table[] = {
 413         {
 414                 .ch_ratio       = FRAC10K(1300),
 415                 .ch0_coeff      = FRAC10K(315),
 416                 .ch1_coeff      = FRAC10K(262),
 417         }, {
 418                 .ch_ratio       = FRAC10K(2600),
 419                 .ch0_coeff      = FRAC10K(337),
 420                 .ch1_coeff      = FRAC10K(430),
 421         }, {
 422                 .ch_ratio       = FRAC10K(3900),
 423                 .ch0_coeff      = FRAC10K(363),
 424                 .ch1_coeff      = FRAC10K(529),
 425         }, {
 426                 .ch_ratio       = FRAC10K(5200),
 427                 .ch0_coeff      = FRAC10K(392),
 428                 .ch1_coeff      = FRAC10K(605),
 429         }, {
 430                 .ch_ratio       = FRAC10K(6500),
 431                 .ch0_coeff      = FRAC10K(229),
 432                 .ch1_coeff      = FRAC10K(291),
 433         }, {
 434                 .ch_ratio       = FRAC10K(8000),
 435                 .ch0_coeff      = FRAC10K(157),
 436                 .ch1_coeff      = FRAC10K(180),
 437         }, {
 438                 .ch_ratio       = FRAC10K(13000),
 439                 .ch0_coeff      = FRAC10K(34),
 440                 .ch1_coeff      = FRAC10K(26),
 441         }, {
 442                 .ch_ratio       = ULONG_MAX,
 443                 .ch0_coeff      = 0,
 444                 .ch1_coeff      = 0,
 445         },
 446 };
 447
 448 /*
 449  * Convert normalized, scaled ADC values to lux.
 450  */
 451 static unsigned int adc_to_lux(u32 adc0, u32 adc1)
 452 {
 453         const struct tsl2563_lux_coeff *lp = lux_table;
 454         unsigned long ratio, lux, ch0 = adc0, ch1 = adc1;
 455
 456         ratio = ch0 ? ((ch1 << ADC_FRAC_BITS) / ch0) : ULONG_MAX;
 457
 458         while (lp->ch_ratio < ratio)
 459                 lp++;
 460
 461         lux = ch0 * lp->ch0_coeff - ch1 * lp->ch1_coeff;
 462
 463         return (unsigned int) (lux >> ADC_FRAC_BITS);
 464 }
 465
 466 /*--------------------------------------------------------------*/
 467 /*                      Sysfs interface                         */
 468 /*--------------------------------------------------------------*/
 469
 470 static ssize_t tsl2563_adc_show(struct device *dev,
 471                                 struct device_attribute *attr, char *buf)
 472 {
 473         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 474         struct tsl2563_chip *chip = indio_dev->dev_data;
 475         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 476         int ret;
 477
 478         mutex_lock(&chip->lock);
 479
 480         ret = tsl2563_get_adc(chip);
 481         if (ret)
 482                 goto out;
 483
 484         switch (this_attr->address) {
 485         case 0:
 486                 ret = snprintf(buf, PAGE_SIZE, "%d\n", chip->data0);
 487                 break;
 488         case 1:
 489                 ret = snprintf(buf, PAGE_SIZE, "%d\n", chip->data1);
 490                 break;
 491         }
 492 out:
 493         mutex_unlock(&chip->lock);
 494         return ret;
 495 }
 496
 497 /* Apply calibration coefficient to ADC count. */
 498 static u32 calib_adc(u32 adc, u32 calib)
 499 {
 500         unsigned long scaled = adc;
 501
 502         scaled *= calib;
 503         scaled >>= CALIB_FRAC_BITS;
 504
 505         return (u32) scaled;
 506 }
 507
 508 static ssize_t tsl2563_lux_show(struct device *dev,
 509                                 struct device_attribute *attr, char *buf)
 510 {
 511         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 512         struct tsl2563_chip *chip = indio_dev->dev_data;
 513         u32 calib0, calib1;
 514         int ret;
 515
 516         mutex_lock(&chip->lock);
 517
 518         ret = tsl2563_get_adc(chip);
 519         if (ret)
 520                 goto out;
 521
 522         calib0 = calib_adc(chip->data0, chip->calib0) * chip->cover_comp_gain;
 523         calib1 = calib_adc(chip->data1, chip->calib1) * chip->cover_comp_gain;
 524
 525         ret = snprintf(buf, PAGE_SIZE, "%d\n", adc_to_lux(calib0, calib1));
 526
 527 out:
 528         mutex_unlock(&chip->lock);
 529         return ret;
 530 }
 531
 532 static ssize_t format_calib(char *buf, int len, u32 calib)
 533 {
 534         return snprintf(buf, PAGE_SIZE, "%d\n", calib_to_sysfs(calib));
 535 }
 536
 537 static ssize_t tsl2563_calib_show(struct device *dev,
 538                                 struct device_attribute *attr, char *buf)
 539 {
 540         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 541         struct tsl2563_chip *chip = indio_dev->dev_data;
 542         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 543         int ret;
 544
 545         mutex_lock(&chip->lock);
 546         switch (this_attr->address) {
 547         case 0:
 548                 ret = format_calib(buf, PAGE_SIZE, chip->calib0);
 549                 break;
 550         case 1:
 551                 ret = format_calib(buf, PAGE_SIZE, chip->calib1);
 552                 break;
 553         default:
 554                 ret = -ENODEV;
 555         }
 556         mutex_unlock(&chip->lock);
 557         return ret;
 558 }
 559
 560 static ssize_t tsl2563_calib_store(struct device *dev,
 561                                 struct device_attribute *attr,
 562                                 const char *buf, size_t len)
 563 {
 564         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 565         struct tsl2563_chip *chip = indio_dev->dev_data;
 566         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 567         int value;
 568         u32 calib;
 569
 570         if (1 != sscanf(buf, "%d", &value))
 571                 return -EINVAL;
 572
 573         calib = calib_from_sysfs(value);
 574
 575         switch (this_attr->address) {
 576         case 0:
 577                 chip->calib0 = calib;
 578                 break;
 579         case 1:
 580                 chip->calib1 = calib;
 581                 break;
 582         }
 583
 584         return len;
 585 }
 586
 587 static IIO_DEVICE_ATTR(intensity0_both_raw, S_IRUGO,
 588                 tsl2563_adc_show, NULL, 0);
 589 static IIO_DEVICE_ATTR(intensity1_ir_raw, S_IRUGO,
 590                 tsl2563_adc_show, NULL, 1);
 591 static DEVICE_ATTR(illuminance0_input, S_IRUGO, tsl2563_lux_show, NULL);
 592 static IIO_DEVICE_ATTR(intensity0_both_calibgain, S_IRUGO | S_IWUSR,
 593                 tsl2563_calib_show, tsl2563_calib_store, 0);
 594 static IIO_DEVICE_ATTR(intensity1_ir_calibgain, S_IRUGO | S_IWUSR,
 595                 tsl2563_calib_show, tsl2563_calib_store, 1);
 596
 597 static ssize_t tsl2563_show_name(struct device *dev,
 598                                 struct device_attribute *attr,
 599                                 char *buf)
 600 {
 601         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 602         struct tsl2563_chip *chip = indio_dev->dev_data;
 603         return sprintf(buf, "%s\n", chip->client->name);
 604 }
 605
 606 static DEVICE_ATTR(name, S_IRUGO, tsl2563_show_name, NULL);
 607
 608 static struct attribute *tsl2563_attributes[] = {
 609         &iio_dev_attr_intensity0_both_raw.dev_attr.attr,
 610         &iio_dev_attr_intensity1_ir_raw.dev_attr.attr,
 611         &dev_attr_illuminance0_input.attr,
 612         &iio_dev_attr_intensity0_both_calibgain.dev_attr.attr,
 613         &iio_dev_attr_intensity1_ir_calibgain.dev_attr.attr,
 614         &dev_attr_name.attr,
 615         NULL
 616 };
 617
 618 static const struct attribute_group tsl2563_group = {
 619         .attrs = tsl2563_attributes,
 620 };
 621
 622 static ssize_t tsl2563_read_thresh(struct device *dev,
 623                         struct device_attribute *attr,
 624                         char *buf)
 625 {
 626         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 627         struct tsl2563_chip *chip = indio_dev->dev_data;
 628         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 629         u16 val = 0;
 630         switch (this_attr->address) {
 631         case TSL2563_REG_HIGHLOW:
 632                 val = chip->high_thres;
 633                 break;
 634         case TSL2563_REG_LOWLOW:
 635                 val = chip->low_thres;
 636                 break;
 637         }
 638         return snprintf(buf, PAGE_SIZE, "%d\n", val);
 639 }
 640
 641 static ssize_t tsl2563_write_thresh(struct device *dev,
 642                                 struct device_attribute *attr,
 643                                 const char *buf,
 644                                 size_t len)
 645 {
 646         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 647         struct tsl2563_chip *chip = indio_dev->dev_data;
 648         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 649         unsigned long val;
 650         int ret;
 651
 652         ret = strict_strtoul(buf, 10, &val);
 653         if (ret)
 654                 return ret;
 655         mutex_lock(&chip->lock);
 656         ret = tsl2563_write(chip->client, this_attr->address, val & 0xFF);
 657         if (ret)
 658                 goto error_ret;
 659         ret = tsl2563_write(chip->client, this_attr->address + 1,
 660                         (val >> 8) & 0xFF);
 661         switch (this_attr->address) {
 662         case TSL2563_REG_HIGHLOW:
 663                 chip->high_thres = val;
 664                 break;
 665         case TSL2563_REG_LOWLOW:
 666                 chip->low_thres = val;
 667                 break;
 668         }
 669
 670 error_ret:
 671         mutex_unlock(&chip->lock);
 672
 673         return ret < 0 ? ret : len;
 674 }
 675
 676 static IIO_DEVICE_ATTR(intensity0_both_raw_thresh_rising_value,
 677                 S_IRUGO | S_IWUSR,
 678                 tsl2563_read_thresh,
 679                 tsl2563_write_thresh,
 680                 TSL2563_REG_HIGHLOW);
 681
 682 static IIO_DEVICE_ATTR(intensity0_both_raw_thresh_falling_value,
 683                 S_IRUGO | S_IWUSR,
 684                 tsl2563_read_thresh,
 685                 tsl2563_write_thresh,
 686                 TSL2563_REG_LOWLOW);
 687
 688 static int tsl2563_int_th(struct iio_dev *dev_info,
 689                         int index,
 690                         s64 timestamp,
 691                         int not_test)
 692 {
 693         struct tsl2563_chip *chip = dev_info->dev_data;
 694
 695         chip->event_timestamp = timestamp;
 696         schedule_work(&chip->work_thresh);
 697
 698         return 0;
 699 }
 700
 701 static void tsl2563_int_bh(struct work_struct *work_s)
 702 {
 703         struct tsl2563_chip *chip
 704                 = container_of(work_s,
 705                         struct tsl2563_chip, work_thresh);
 706         u8 cmd = TSL2563_CMD | TSL2563_CLEARINT;
 707
 708         iio_push_event(chip->indio_dev, 0,
 709                        IIO_UNMOD_EVENT_CODE(IIO_EV_CLASS_LIGHT,
 710                                             0,
 711                                             IIO_EV_TYPE_THRESH,
 712                                             IIO_EV_DIR_EITHER),
 713                        chip->event_timestamp);
 714
 715         /* reenable_irq */
 716         enable_irq(chip->client->irq);
 717         /* clear the interrupt and push the event */
 718         i2c_master_send(chip->client, &cmd, sizeof(cmd));
 719
 720 }
 721
 722 static ssize_t tsl2563_write_interrupt_config(struct device *dev,
 723                                         struct device_attribute *attr,
 724                                         const char *buf,
 725                                         size_t len)
 726 {
 727         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 728         struct tsl2563_chip *chip = indio_dev->dev_data;
 729         struct iio_event_attr *this_attr = to_iio_event_attr(attr);
 730         int input, ret = 0;
 731
 732         ret = sscanf(buf, "%d", &input);
 733         if (ret != 1)
 734                 return -EINVAL;
 735         mutex_lock(&chip->lock);
 736         if (input && !(chip->intr & 0x30)) {
 737                 iio_add_event_to_list(this_attr->listel,
 738                                 &indio_dev->interrupts[0]->ev_list);
 739                 chip->intr &= ~0x30;
 740                 chip->intr |= 0x10;
 741                 /* ensure the chip is actually on */
 742                 cancel_delayed_work(&chip->poweroff_work);
 743                 if (!tsl2563_get_power(chip)) {
 744                         ret = tsl2563_set_power(chip, 1);
 745                         if (ret)
 746                                 goto out;
 747                         ret = tsl2563_configure(chip);
 748                         if (ret)
 749                                 goto out;
 750                 }
 751                 ret = tsl2563_write(chip->client, TSL2563_REG_INT, chip->intr);
 752                 chip->int_enabled = true;
 753         }
 754
 755         if (!input && (chip->intr & 0x30)) {
 756                 chip->intr |= ~0x30;
 757                 ret = tsl2563_write(chip->client, TSL2563_REG_INT, chip->intr);
 758                 iio_remove_event_from_list(this_attr->listel,
 759                                         &indio_dev->interrupts[0]->ev_list);
 760                 chip->int_enabled = false;
 761                 /* now the interrupt is not enabled, we can go to sleep */
 762                 schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
 763         }
 764 out:
 765         mutex_unlock(&chip->lock);
 766
 767         return (ret < 0) ? ret : len;
 768 }
 769
 770 static ssize_t tsl2563_read_interrupt_config(struct device *dev,
 771                                         struct device_attribute *attr,
 772                                         char *buf)
 773 {
 774         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 775         struct tsl2563_chip *chip = indio_dev->dev_data;
 776         int ret;
 777         u8 rxbuf;
 778         ssize_t len;
 779
 780         mutex_lock(&chip->lock);
 781         ret = tsl2563_read(chip->client,
 782                         TSL2563_REG_INT,
 783                         &rxbuf,
 784                         sizeof(rxbuf));
 785         mutex_unlock(&chip->lock);
 786         if (ret < 0)
 787                 goto error_ret;
 788         len = snprintf(buf, PAGE_SIZE, "%d\n", !!(rxbuf & 0x30));
 789 error_ret:
 790
 791         return (ret < 0) ? ret : len;
 792 }
 793
 794 IIO_EVENT_ATTR(intensity0_both_thresh_en,
 795         tsl2563_read_interrupt_config,
 796         tsl2563_write_interrupt_config,
 797         0,
 798         tsl2563_int_th);
 799
 800 static struct attribute *tsl2563_event_attributes[] = {
 801         &iio_event_attr_intensity0_both_thresh_en.dev_attr.attr,
 802         &iio_dev_attr_intensity0_both_raw_thresh_rising_value.dev_attr.attr,
 803         &iio_dev_attr_intensity0_both_raw_thresh_falling_value.dev_attr.attr,
 804         NULL,
 805 };
 806
 807 static struct attribute_group tsl2563_event_attribute_group = {
 808         .attrs = tsl2563_event_attributes,
 809 };
 810
 811 /*--------------------------------------------------------------*/
 812 /*                      Probe, Attach, Remove                   */
 813 /*--------------------------------------------------------------*/
 814 static struct i2c_driver tsl2563_i2c_driver;
 815
 816 static int __devinit tsl2563_probe(struct i2c_client *client,
 817                                 const struct i2c_device_id *device_id)
 818 {
 819         struct tsl2563_chip *chip;
 820         struct tsl2563_platform_data *pdata = client->dev.platform_data;
 821         int err = 0;
 822         int ret;
 823         u8 id;
 824
 825         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 826         if (!chip)
 827                 return -ENOMEM;
 828
 829         INIT_WORK(&chip->work_thresh, tsl2563_int_bh);
 830         i2c_set_clientdata(client, chip);
 831         chip->client = client;
 832
 833         err = tsl2563_detect(chip);
 834         if (err) {
 835                 dev_err(&client->dev, "device not found, error %d\n", -err);
 836                 goto fail1;
 837         }
 838
 839         err = tsl2563_read_id(chip, &id);
 840         if (err)
 841                 goto fail1;
 842
 843         mutex_init(&chip->lock);
 844
 845         /* Default values used until userspace says otherwise */
 846         chip->low_thres = 0x0;
 847         chip->high_thres = 0xffff;
 848         chip->gainlevel = tsl2563_gainlevel_table;
 849         chip->intr = TSL2563_INT_PERSIST(4);
 850         chip->calib0 = calib_from_sysfs(CALIB_BASE_SYSFS);
 851         chip->calib1 = calib_from_sysfs(CALIB_BASE_SYSFS);
 852
 853         if (pdata)
 854                 chip->cover_comp_gain = pdata->cover_comp_gain;
 855         else
 856                 chip->cover_comp_gain = 1;
 857
 858         dev_info(&client->dev, "model %d, rev. %d\n", id >> 4, id & 0x0f);
 859
 860         chip->indio_dev = iio_allocate_device();
 861         if (!chip->indio_dev)
 862                 goto fail1;
 863         chip->indio_dev->attrs = &tsl2563_group;
 864         chip->indio_dev->dev.parent = &client->dev;
 865         chip->indio_dev->dev_data = (void *)(chip);
 866         chip->indio_dev->driver_module = THIS_MODULE;
 867         chip->indio_dev->modes = INDIO_DIRECT_MODE;
 868         if (client->irq) {
 869                 chip->indio_dev->num_interrupt_lines = 1;
 870                 chip->indio_dev->event_attrs
 871                         = &tsl2563_event_attribute_group;
 872         }
 873         ret = iio_device_register(chip->indio_dev);
 874         if (ret)
 875                 goto fail1;
 876
 877         if (client->irq) {
 878                 ret = iio_register_interrupt_line(client->irq,
 879                                                 chip->indio_dev,
 880                                                 0,
 881                                                 IRQF_TRIGGER_RISING,
 882                                                 client->name);
 883                 if (ret)
 884                         goto fail2;
 885         }
 886         err = tsl2563_configure(chip);
 887         if (err)
 888                 goto fail3;
 889
 890         INIT_DELAYED_WORK(&chip->poweroff_work, tsl2563_poweroff_work);
 891         /* The interrupt cannot yet be enabled so this is fine without lock */
 892         schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
 893
 894         return 0;
 895 fail3:
 896         if (client->irq)
 897                 iio_unregister_interrupt_line(chip->indio_dev, 0);
 898 fail2:
 899         iio_device_unregister(chip->indio_dev);
 900 fail1:
 901         kfree(chip);
 902         return err;
 903 }
 904
 905 static int tsl2563_remove(struct i2c_client *client)
 906 {
 907         struct tsl2563_chip *chip = i2c_get_clientdata(client);
 908         if (!chip->int_enabled)
 909                 cancel_delayed_work(&chip->poweroff_work);
 910         /* Ensure that interrupts are disabled - then flush any bottom halves */
 911         chip->intr |= ~0x30;
 912         tsl2563_write(chip->client, TSL2563_REG_INT, chip->intr);
 913         flush_scheduled_work();
 914         tsl2563_set_power(chip, 0);
 915         if (client->irq)
 916                 iio_unregister_interrupt_line(chip->indio_dev, 0);
 917         iio_device_unregister(chip->indio_dev);
 918
 919         kfree(chip);
 920         return 0;
 921 }
 922
 923 static int tsl2563_suspend(struct i2c_client *client, pm_message_t state)
 924 {
 925         struct tsl2563_chip *chip = i2c_get_clientdata(client);
 926         int ret;
 927
 928         mutex_lock(&chip->lock);
 929
 930         ret = tsl2563_set_power(chip, 0);
 931         if (ret)
 932                 goto out;
 933
 934         chip->state = state;
 935
 936 out:
 937         mutex_unlock(&chip->lock);
 938         return ret;
 939 }
 940
 941 static int tsl2563_resume(struct i2c_client *client)
 942 {
 943         struct tsl2563_chip *chip = i2c_get_clientdata(client);
 944         int ret;
 945
 946         mutex_lock(&chip->lock);
 947
 948         ret = tsl2563_set_power(chip, 1);
 949         if (ret)
 950                 goto out;
 951
 952         ret = tsl2563_configure(chip);
 953         if (ret)
 954                 goto out;
 955
 956         chip->state.event = PM_EVENT_ON;
 957
 958 out:
 959         mutex_unlock(&chip->lock);
 960         return ret;
 961 }
 962
 963 static const struct i2c_device_id tsl2563_id[] = {
 964         { "tsl2560", 0 },
 965         { "tsl2561", 1 },
 966         { "tsl2562", 2 },
 967         { "tsl2563", 3 },
 968         {}
 969 };
 970 MODULE_DEVICE_TABLE(i2c, tsl2563_id);
 971
 972 static struct i2c_driver tsl2563_i2c_driver = {
 973         .driver = {
 974                 .name    = "tsl2563",
 975         },
 976         .suspend        = tsl2563_suspend,
 977         .resume         = tsl2563_resume,
 978         .probe          = tsl2563_probe,
 979         .remove         = __devexit_p(tsl2563_remove),
 980         .id_table       = tsl2563_id,
 981 };
 982
 983 static int __init tsl2563_init(void)
 984 {
 985         return i2c_add_driver(&tsl2563_i2c_driver);
 986 }
 987
 988 static void __exit tsl2563_exit(void)
 989 {
 990         i2c_del_driver(&tsl2563_i2c_driver);
 991 }
 992
 993 MODULE_AUTHOR("Nokia Corporation");
 994 MODULE_DESCRIPTION("tsl2563 light sensor driver");
 995 MODULE_LICENSE("GPL");
 996
 997 module_init(tsl2563_init);
 998 module_exit(tsl2563_exit);