drivers/staging/iio/adc/adt7310.c

   1 /*
   2  * ADT7310 digital temperature sensor driver supporting ADT7310
   3  *
   4  * Copyright 2010 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  */
   8
   9 #include <linux/interrupt.h>
  10 #include <linux/device.h>
  11 #include <linux/kernel.h>
  12 #include <linux/slab.h>
  13 #include <linux/sysfs.h>
  14 #include <linux/list.h>
  15 #include <linux/spi/spi.h>
  16
  17 #include "../iio.h"
  18 #include "../sysfs.h"
  19
  20 /*
  21  * ADT7310 registers definition
  22  */
  23
  24 #define ADT7310_STATUS                  0
  25 #define ADT7310_CONFIG                  1
  26 #define ADT7310_TEMPERATURE             2
  27 #define ADT7310_ID                      3
  28 #define ADT7310_T_CRIT                  4
  29 #define ADT7310_T_HYST                  5
  30 #define ADT7310_T_ALARM_HIGH            6
  31 #define ADT7310_T_ALARM_LOW             7
  32
  33 /*
  34  * ADT7310 status
  35  */
  36 #define ADT7310_STAT_T_LOW              0x10
  37 #define ADT7310_STAT_T_HIGH             0x20
  38 #define ADT7310_STAT_T_CRIT             0x40
  39 #define ADT7310_STAT_NOT_RDY            0x80
  40
  41 /*
  42  * ADT7310 config
  43  */
  44 #define ADT7310_FAULT_QUEUE_MASK        0x3
  45 #define ADT7310_CT_POLARITY             0x4
  46 #define ADT7310_INT_POLARITY            0x8
  47 #define ADT7310_EVENT_MODE              0x10
  48 #define ADT7310_MODE_MASK               0x60
  49 #define ADT7310_ONESHOT                 0x20
  50 #define ADT7310_SPS                     0x40
  51 #define ADT7310_PD                      0x60
  52 #define ADT7310_RESOLUTION              0x80
  53
  54 /*
  55  * ADT7310 masks
  56  */
  57 #define ADT7310_T16_VALUE_SIGN                  0x8000
  58 #define ADT7310_T16_VALUE_FLOAT_OFFSET          7
  59 #define ADT7310_T16_VALUE_FLOAT_MASK            0x7F
  60 #define ADT7310_T13_VALUE_SIGN                  0x1000
  61 #define ADT7310_T13_VALUE_OFFSET                3
  62 #define ADT7310_T13_VALUE_FLOAT_OFFSET          4
  63 #define ADT7310_T13_VALUE_FLOAT_MASK            0xF
  64 #define ADT7310_T_HYST_MASK                     0xF
  65 #define ADT7310_DEVICE_ID_MASK                  0x7
  66 #define ADT7310_MANUFACTORY_ID_MASK             0xF8
  67 #define ADT7310_MANUFACTORY_ID_OFFSET           3
  68
  69
  70 #define ADT7310_CMD_REG_MASK                    0x28
  71 #define ADT7310_CMD_REG_OFFSET                  3
  72 #define ADT7310_CMD_READ                        0x40
  73 #define ADT7310_CMD_CON_READ                    0x4
  74
  75 #define ADT7310_IRQS                            2
  76
  77 /*
  78  * struct adt7310_chip_info - chip specifc information
  79  */
  80
  81 struct adt7310_chip_info {
  82         struct spi_device *spi_dev;
  83         u8  config;
  84 };
  85
  86 /*
  87  * adt7310 register access by SPI
  88  */
  89
  90 static int adt7310_spi_read_word(struct adt7310_chip_info *chip, u8 reg, u16 *data)
  91 {
  92         struct spi_device *spi_dev = chip->spi_dev;
  93         u8 command = (reg << ADT7310_CMD_REG_OFFSET) & ADT7310_CMD_REG_MASK;
  94         int ret = 0;
  95
  96         command |= ADT7310_CMD_READ;
  97         ret = spi_write(spi_dev, &command, sizeof(command));
  98         if (ret < 0) {
  99                 dev_err(&spi_dev->dev, "SPI write command error\n");
 100                 return ret;
 101         }
 102
 103         ret = spi_read(spi_dev, (u8 *)data, sizeof(*data));
 104         if (ret < 0) {
 105                 dev_err(&spi_dev->dev, "SPI read word error\n");
 106                 return ret;
 107         }
 108
 109         *data = be16_to_cpu(*data);
 110
 111         return 0;
 112 }
 113
 114 static int adt7310_spi_write_word(struct adt7310_chip_info *chip, u8 reg, u16 data)
 115 {
 116         struct spi_device *spi_dev = chip->spi_dev;
 117         u8 buf[3];
 118         int ret = 0;
 119
 120         buf[0] = (reg << ADT7310_CMD_REG_OFFSET) & ADT7310_CMD_REG_MASK;
 121         buf[1] = (u8)(data >> 8);
 122         buf[2] = (u8)(data & 0xFF);
 123
 124         ret = spi_write(spi_dev, buf, 3);
 125         if (ret < 0) {
 126                 dev_err(&spi_dev->dev, "SPI write word error\n");
 127                 return ret;
 128         }
 129
 130         return ret;
 131 }
 132
 133 static int adt7310_spi_read_byte(struct adt7310_chip_info *chip, u8 reg, u8 *data)
 134 {
 135         struct spi_device *spi_dev = chip->spi_dev;
 136         u8 command = (reg << ADT7310_CMD_REG_OFFSET) & ADT7310_CMD_REG_MASK;
 137         int ret = 0;
 138
 139         command |= ADT7310_CMD_READ;
 140         ret = spi_write(spi_dev, &command, sizeof(command));
 141         if (ret < 0) {
 142                 dev_err(&spi_dev->dev, "SPI write command error\n");
 143                 return ret;
 144         }
 145
 146         ret = spi_read(spi_dev, data, sizeof(*data));
 147         if (ret < 0) {
 148                 dev_err(&spi_dev->dev, "SPI read byte error\n");
 149                 return ret;
 150         }
 151
 152         return 0;
 153 }
 154
 155 static int adt7310_spi_write_byte(struct adt7310_chip_info *chip, u8 reg, u8 data)
 156 {
 157         struct spi_device *spi_dev = chip->spi_dev;
 158         u8 buf[2];
 159         int ret = 0;
 160
 161         buf[0] = (reg << ADT7310_CMD_REG_OFFSET) & ADT7310_CMD_REG_MASK;
 162         buf[1] = data;
 163
 164         ret = spi_write(spi_dev, buf, 2);
 165         if (ret < 0) {
 166                 dev_err(&spi_dev->dev, "SPI write byte error\n");
 167                 return ret;
 168         }
 169
 170         return ret;
 171 }
 172
 173 static ssize_t adt7310_show_mode(struct device *dev,
 174                 struct device_attribute *attr,
 175                 char *buf)
 176 {
 177         struct iio_dev *dev_info = dev_get_drvdata(dev);
 178         struct adt7310_chip_info *chip = iio_priv(dev_info);
 179         u8 config;
 180
 181         config = chip->config & ADT7310_MODE_MASK;
 182
 183         switch (config) {
 184         case ADT7310_PD:
 185                 return sprintf(buf, "power-down\n");
 186         case ADT7310_ONESHOT:
 187                 return sprintf(buf, "one-shot\n");
 188         case ADT7310_SPS:
 189                 return sprintf(buf, "sps\n");
 190         default:
 191                 return sprintf(buf, "full\n");
 192         }
 193 }
 194
 195 static ssize_t adt7310_store_mode(struct device *dev,
 196                 struct device_attribute *attr,
 197                 const char *buf,
 198                 size_t len)
 199 {
 200         struct iio_dev *dev_info = dev_get_drvdata(dev);
 201         struct adt7310_chip_info *chip = iio_priv(dev_info);
 202         u16 config;
 203         int ret;
 204
 205         ret = adt7310_spi_read_byte(chip, ADT7310_CONFIG, &chip->config);
 206         if (ret)
 207                 return -EIO;
 208
 209         config = chip->config & (~ADT7310_MODE_MASK);
 210         if (strcmp(buf, "power-down"))
 211                 config |= ADT7310_PD;
 212         else if (strcmp(buf, "one-shot"))
 213                 config |= ADT7310_ONESHOT;
 214         else if (strcmp(buf, "sps"))
 215                 config |= ADT7310_SPS;
 216
 217         ret = adt7310_spi_write_byte(chip, ADT7310_CONFIG, config);
 218         if (ret)
 219                 return -EIO;
 220
 221         chip->config = config;
 222
 223         return len;
 224 }
 225
 226 static IIO_DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
 227                 adt7310_show_mode,
 228                 adt7310_store_mode,
 229                 0);
 230
 231 static ssize_t adt7310_show_available_modes(struct device *dev,
 232                 struct device_attribute *attr,
 233                 char *buf)
 234 {
 235         return sprintf(buf, "full\none-shot\nsps\npower-down\n");
 236 }
 237
 238 static IIO_DEVICE_ATTR(available_modes, S_IRUGO, adt7310_show_available_modes, NULL, 0);
 239
 240 static ssize_t adt7310_show_resolution(struct device *dev,
 241                 struct device_attribute *attr,
 242                 char *buf)
 243 {
 244         struct iio_dev *dev_info = dev_get_drvdata(dev);
 245         struct adt7310_chip_info *chip = iio_priv(dev_info);
 246         int ret;
 247         int bits;
 248
 249         ret = adt7310_spi_read_byte(chip, ADT7310_CONFIG, &chip->config);
 250         if (ret)
 251                 return -EIO;
 252
 253         if (chip->config & ADT7310_RESOLUTION)
 254                 bits = 16;
 255         else
 256                 bits = 13;
 257
 258         return sprintf(buf, "%d bits\n", bits);
 259 }
 260
 261 static ssize_t adt7310_store_resolution(struct device *dev,
 262                 struct device_attribute *attr,
 263                 const char *buf,
 264                 size_t len)
 265 {
 266         struct iio_dev *dev_info = dev_get_drvdata(dev);
 267         struct adt7310_chip_info *chip = iio_priv(dev_info);
 268         unsigned long data;
 269         u16 config;
 270         int ret;
 271
 272         ret = strict_strtoul(buf, 10, &data);
 273         if (ret)
 274                 return -EINVAL;
 275
 276         ret = adt7310_spi_read_byte(chip, ADT7310_CONFIG, &chip->config);
 277         if (ret)
 278                 return -EIO;
 279
 280         config = chip->config & (~ADT7310_RESOLUTION);
 281         if (data)
 282                 config |= ADT7310_RESOLUTION;
 283
 284         ret = adt7310_spi_write_byte(chip, ADT7310_CONFIG, config);
 285         if (ret)
 286                 return -EIO;
 287
 288         chip->config = config;
 289
 290         return len;
 291 }
 292
 293 static IIO_DEVICE_ATTR(resolution, S_IRUGO | S_IWUSR,
 294                 adt7310_show_resolution,
 295                 adt7310_store_resolution,
 296                 0);
 297
 298 static ssize_t adt7310_show_id(struct device *dev,
 299                 struct device_attribute *attr,
 300                 char *buf)
 301 {
 302         struct iio_dev *dev_info = dev_get_drvdata(dev);
 303         struct adt7310_chip_info *chip = iio_priv(dev_info);
 304         u8 id;
 305         int ret;
 306
 307         ret = adt7310_spi_read_byte(chip, ADT7310_ID, &id);
 308         if (ret)
 309                 return -EIO;
 310
 311         return sprintf(buf, "device id: 0x%x\nmanufactory id: 0x%x\n",
 312                         id & ADT7310_DEVICE_ID_MASK,
 313                         (id & ADT7310_MANUFACTORY_ID_MASK) >> ADT7310_MANUFACTORY_ID_OFFSET);
 314 }
 315
 316 static IIO_DEVICE_ATTR(id, S_IRUGO | S_IWUSR,
 317                 adt7310_show_id,
 318                 NULL,
 319                 0);
 320
 321 static ssize_t adt7310_convert_temperature(struct adt7310_chip_info *chip,
 322                 u16 data, char *buf)
 323 {
 324         char sign = ' ';
 325
 326         if (chip->config & ADT7310_RESOLUTION) {
 327                 if (data & ADT7310_T16_VALUE_SIGN) {
 328                         /* convert supplement to positive value */
 329                         data = (u16)((ADT7310_T16_VALUE_SIGN << 1) - (u32)data);
 330                         sign = '-';
 331                 }
 332                 return sprintf(buf, "%c%d.%.7d\n", sign,
 333                                 (data >> ADT7310_T16_VALUE_FLOAT_OFFSET),
 334                                 (data & ADT7310_T16_VALUE_FLOAT_MASK) * 78125);
 335         } else {
 336                 if (data & ADT7310_T13_VALUE_SIGN) {
 337                         /* convert supplement to positive value */
 338                         data >>= ADT7310_T13_VALUE_OFFSET;
 339                         data = (ADT7310_T13_VALUE_SIGN << 1) - data;
 340                         sign = '-';
 341                 }
 342                 return sprintf(buf, "%c%d.%.4d\n", sign,
 343                                 (data >> ADT7310_T13_VALUE_FLOAT_OFFSET),
 344                                 (data & ADT7310_T13_VALUE_FLOAT_MASK) * 625);
 345         }
 346 }
 347
 348 static ssize_t adt7310_show_value(struct device *dev,
 349                 struct device_attribute *attr,
 350                 char *buf)
 351 {
 352         struct iio_dev *dev_info = dev_get_drvdata(dev);
 353         struct adt7310_chip_info *chip = iio_priv(dev_info);
 354         u8 status;
 355         u16 data;
 356         int ret, i = 0;
 357
 358         do {
 359                 ret = adt7310_spi_read_byte(chip, ADT7310_STATUS, &status);
 360                 if (ret)
 361                         return -EIO;
 362                 i++;
 363                 if (i == 10000)
 364                         return -EIO;
 365         } while (status & ADT7310_STAT_NOT_RDY);
 366
 367         ret = adt7310_spi_read_word(chip, ADT7310_TEMPERATURE, &data);
 368         if (ret)
 369                 return -EIO;
 370
 371         return adt7310_convert_temperature(chip, data, buf);
 372 }
 373
 374 static IIO_DEVICE_ATTR(value, S_IRUGO, adt7310_show_value, NULL, 0);
 375
 376 static struct attribute *adt7310_attributes[] = {
 377         &iio_dev_attr_available_modes.dev_attr.attr,
 378         &iio_dev_attr_mode.dev_attr.attr,
 379         &iio_dev_attr_resolution.dev_attr.attr,
 380         &iio_dev_attr_id.dev_attr.attr,
 381         &iio_dev_attr_value.dev_attr.attr,
 382         NULL,
 383 };
 384
 385 static const struct attribute_group adt7310_attribute_group = {
 386         .attrs = adt7310_attributes,
 387 };
 388
 389 static irqreturn_t adt7310_event_handler(int irq, void *private)
 390 {
 391         struct iio_dev *indio_dev = private;
 392         struct adt7310_chip_info *chip = iio_priv(indio_dev);
 393         s64 timestamp = iio_get_time_ns();
 394         u8 status;
 395         int ret;
 396
 397         ret = adt7310_spi_read_byte(chip, ADT7310_STATUS, &status);
 398         if (ret)
 399                 return ret;
 400
 401         if (status & ADT7310_STAT_T_HIGH)
 402                 iio_push_event(indio_dev, 0,
 403                                IIO_UNMOD_EVENT_CODE(IIO_TEMP, 0,
 404                                                     IIO_EV_TYPE_THRESH,
 405                                                     IIO_EV_DIR_RISING),
 406                                timestamp);
 407         if (status & ADT7310_STAT_T_LOW)
 408                 iio_push_event(indio_dev, 0,
 409                                IIO_UNMOD_EVENT_CODE(IIO_TEMP, 0,
 410                                                     IIO_EV_TYPE_THRESH,
 411                                                     IIO_EV_DIR_FALLING),
 412                                timestamp);
 413         if (status & ADT7310_STAT_T_CRIT)
 414                 iio_push_event(indio_dev, 0,
 415                                IIO_UNMOD_EVENT_CODE(IIO_TEMP, 0,
 416                                                     IIO_EV_TYPE_THRESH,
 417                                                     IIO_EV_DIR_RISING),
 418                         timestamp);
 419         return IRQ_HANDLED;
 420 }
 421
 422 static ssize_t adt7310_show_event_mode(struct device *dev,
 423                 struct device_attribute *attr,
 424                 char *buf)
 425 {
 426         struct iio_dev *dev_info = dev_get_drvdata(dev);
 427         struct adt7310_chip_info *chip = iio_priv(dev_info);
 428         int ret;
 429
 430         ret = adt7310_spi_read_byte(chip, ADT7310_CONFIG, &chip->config);
 431         if (ret)
 432                 return -EIO;
 433
 434         if (chip->config & ADT7310_EVENT_MODE)
 435                 return sprintf(buf, "interrupt\n");
 436         else
 437                 return sprintf(buf, "comparator\n");
 438 }
 439
 440 static ssize_t adt7310_set_event_mode(struct device *dev,
 441                 struct device_attribute *attr,
 442                 const char *buf,
 443                 size_t len)
 444 {
 445         struct iio_dev *dev_info = dev_get_drvdata(dev);
 446         struct adt7310_chip_info *chip = iio_priv(dev_info);
 447         u16 config;
 448         int ret;
 449
 450         ret = adt7310_spi_read_byte(chip, ADT7310_CONFIG, &chip->config);
 451         if (ret)
 452                 return -EIO;
 453
 454         config = chip->config &= ~ADT7310_EVENT_MODE;
 455         if (strcmp(buf, "comparator") != 0)
 456                 config |= ADT7310_EVENT_MODE;
 457
 458         ret = adt7310_spi_write_byte(chip, ADT7310_CONFIG, config);
 459         if (ret)
 460                 return -EIO;
 461
 462         chip->config = config;
 463
 464         return len;
 465 }
 466
 467 static ssize_t adt7310_show_available_event_modes(struct device *dev,
 468                 struct device_attribute *attr,
 469                 char *buf)
 470 {
 471         return sprintf(buf, "comparator\ninterrupt\n");
 472 }
 473
 474 static ssize_t adt7310_show_fault_queue(struct device *dev,
 475                 struct device_attribute *attr,
 476                 char *buf)
 477 {
 478         struct iio_dev *dev_info = dev_get_drvdata(dev);
 479         struct adt7310_chip_info *chip = iio_priv(dev_info);
 480         int ret;
 481
 482         ret = adt7310_spi_read_byte(chip, ADT7310_CONFIG, &chip->config);
 483         if (ret)
 484                 return -EIO;
 485
 486         return sprintf(buf, "%d\n", chip->config & ADT7310_FAULT_QUEUE_MASK);
 487 }
 488
 489 static ssize_t adt7310_set_fault_queue(struct device *dev,
 490                 struct device_attribute *attr,
 491                 const char *buf,
 492                 size_t len)
 493 {
 494         struct iio_dev *dev_info = dev_get_drvdata(dev);
 495         struct adt7310_chip_info *chip = iio_priv(dev_info);
 496         unsigned long data;
 497         int ret;
 498         u8 config;
 499
 500         ret = strict_strtoul(buf, 10, &data);
 501         if (ret || data > 3)
 502                 return -EINVAL;
 503
 504         ret = adt7310_spi_read_byte(chip, ADT7310_CONFIG, &chip->config);
 505         if (ret)
 506                 return -EIO;
 507
 508         config = chip->config & ~ADT7310_FAULT_QUEUE_MASK;
 509         config |= data;
 510         ret = adt7310_spi_write_byte(chip, ADT7310_CONFIG, config);
 511         if (ret)
 512                 return -EIO;
 513
 514         chip->config = config;
 515
 516         return len;
 517 }
 518
 519 static inline ssize_t adt7310_show_t_bound(struct device *dev,
 520                 struct device_attribute *attr,
 521                 u8 bound_reg,
 522                 char *buf)
 523 {
 524         struct iio_dev *dev_info = dev_get_drvdata(dev);
 525         struct adt7310_chip_info *chip = iio_priv(dev_info);
 526         u16 data;
 527         int ret;
 528
 529         ret = adt7310_spi_read_word(chip, bound_reg, &data);
 530         if (ret)
 531                 return -EIO;
 532
 533         return adt7310_convert_temperature(chip, data, buf);
 534 }
 535
 536 static inline ssize_t adt7310_set_t_bound(struct device *dev,
 537                 struct device_attribute *attr,
 538                 u8 bound_reg,
 539                 const char *buf,
 540                 size_t len)
 541 {
 542         struct iio_dev *dev_info = dev_get_drvdata(dev);
 543         struct adt7310_chip_info *chip = iio_priv(dev_info);
 544         long tmp1, tmp2;
 545         u16 data;
 546         char *pos;
 547         int ret;
 548
 549         pos = strchr(buf, '.');
 550
 551         ret = strict_strtol(buf, 10, &tmp1);
 552
 553         if (ret || tmp1 > 127 || tmp1 < -128)
 554                 return -EINVAL;
 555
 556         if (pos) {
 557                 len = strlen(pos);
 558
 559                 if (chip->config & ADT7310_RESOLUTION) {
 560                         if (len > ADT7310_T16_VALUE_FLOAT_OFFSET)
 561                                 len = ADT7310_T16_VALUE_FLOAT_OFFSET;
 562                         pos[len] = 0;
 563                         ret = strict_strtol(pos, 10, &tmp2);
 564
 565                         if (!ret)
 566                                 tmp2 = (tmp2 / 78125) * 78125;
 567                 } else {
 568                         if (len > ADT7310_T13_VALUE_FLOAT_OFFSET)
 569                                 len = ADT7310_T13_VALUE_FLOAT_OFFSET;
 570                         pos[len] = 0;
 571                         ret = strict_strtol(pos, 10, &tmp2);
 572
 573                         if (!ret)
 574                                 tmp2 = (tmp2 / 625) * 625;
 575                 }
 576         }
 577
 578         if (tmp1 < 0)
 579                 data = (u16)(-tmp1);
 580         else
 581                 data = (u16)tmp1;
 582
 583         if (chip->config & ADT7310_RESOLUTION) {
 584                 data = (data << ADT7310_T16_VALUE_FLOAT_OFFSET) |
 585                         (tmp2 & ADT7310_T16_VALUE_FLOAT_MASK);
 586
 587                 if (tmp1 < 0)
 588                         /* convert positive value to supplyment */
 589                         data = (u16)((ADT7310_T16_VALUE_SIGN << 1) - (u32)data);
 590         } else {
 591                 data = (data << ADT7310_T13_VALUE_FLOAT_OFFSET) |
 592                         (tmp2 & ADT7310_T13_VALUE_FLOAT_MASK);
 593
 594                 if (tmp1 < 0)
 595                         /* convert positive value to supplyment */
 596                         data = (ADT7310_T13_VALUE_SIGN << 1) - data;
 597                 data <<= ADT7310_T13_VALUE_OFFSET;
 598         }
 599
 600         ret = adt7310_spi_write_word(chip, bound_reg, data);
 601         if (ret)
 602                 return -EIO;
 603
 604         return len;
 605 }
 606
 607 static ssize_t adt7310_show_t_alarm_high(struct device *dev,
 608                 struct device_attribute *attr,
 609                 char *buf)
 610 {
 611         return adt7310_show_t_bound(dev, attr,
 612                         ADT7310_T_ALARM_HIGH, buf);
 613 }
 614
 615 static inline ssize_t adt7310_set_t_alarm_high(struct device *dev,
 616                 struct device_attribute *attr,
 617                 const char *buf,
 618                 size_t len)
 619 {
 620         return adt7310_set_t_bound(dev, attr,
 621                         ADT7310_T_ALARM_HIGH, buf, len);
 622 }
 623
 624 static ssize_t adt7310_show_t_alarm_low(struct device *dev,
 625                 struct device_attribute *attr,
 626                 char *buf)
 627 {
 628         return adt7310_show_t_bound(dev, attr,
 629                         ADT7310_T_ALARM_LOW, buf);
 630 }
 631
 632 static inline ssize_t adt7310_set_t_alarm_low(struct device *dev,
 633                 struct device_attribute *attr,
 634                 const char *buf,
 635                 size_t len)
 636 {
 637         return adt7310_set_t_bound(dev, attr,
 638                         ADT7310_T_ALARM_LOW, buf, len);
 639 }
 640
 641 static ssize_t adt7310_show_t_crit(struct device *dev,
 642                 struct device_attribute *attr,
 643                 char *buf)
 644 {
 645         return adt7310_show_t_bound(dev, attr,
 646                         ADT7310_T_CRIT, buf);
 647 }
 648
 649 static inline ssize_t adt7310_set_t_crit(struct device *dev,
 650                 struct device_attribute *attr,
 651                 const char *buf,
 652                 size_t len)
 653 {
 654         return adt7310_set_t_bound(dev, attr,
 655                         ADT7310_T_CRIT, buf, len);
 656 }
 657
 658 static ssize_t adt7310_show_t_hyst(struct device *dev,
 659                 struct device_attribute *attr,
 660                 char *buf)
 661 {
 662         struct iio_dev *dev_info = dev_get_drvdata(dev);
 663         struct adt7310_chip_info *chip = iio_priv(dev_info);
 664         int ret;
 665         u8 t_hyst;
 666
 667         ret = adt7310_spi_read_byte(chip, ADT7310_T_HYST, &t_hyst);
 668         if (ret)
 669                 return -EIO;
 670
 671         return sprintf(buf, "%d\n", t_hyst & ADT7310_T_HYST_MASK);
 672 }
 673
 674 static inline ssize_t adt7310_set_t_hyst(struct device *dev,
 675                 struct device_attribute *attr,
 676                 const char *buf,
 677                 size_t len)
 678 {
 679         struct iio_dev *dev_info = dev_get_drvdata(dev);
 680         struct adt7310_chip_info *chip = iio_priv(dev_info);
 681         int ret;
 682         unsigned long data;
 683         u8 t_hyst;
 684
 685         ret = strict_strtol(buf, 10, &data);
 686
 687         if (ret || data > ADT7310_T_HYST_MASK)
 688                 return -EINVAL;
 689
 690         t_hyst = (u8)data;
 691
 692         ret = adt7310_spi_write_byte(chip, ADT7310_T_HYST, t_hyst);
 693         if (ret)
 694                 return -EIO;
 695
 696         return len;
 697 }
 698
 699 static IIO_DEVICE_ATTR(event_mode,
 700                        S_IRUGO | S_IWUSR,
 701                        adt7310_show_event_mode, adt7310_set_event_mode, 0);
 702 static IIO_DEVICE_ATTR(available_event_modes,
 703                        S_IRUGO | S_IWUSR,
 704                        adt7310_show_available_event_modes, NULL, 0);
 705 static IIO_DEVICE_ATTR(fault_queue,
 706                        S_IRUGO | S_IWUSR,
 707                        adt7310_show_fault_queue, adt7310_set_fault_queue, 0);
 708 static IIO_DEVICE_ATTR(t_alarm_high,
 709                        S_IRUGO | S_IWUSR,
 710                        adt7310_show_t_alarm_high, adt7310_set_t_alarm_high, 0);
 711 static IIO_DEVICE_ATTR(t_alarm_low,
 712                        S_IRUGO | S_IWUSR,
 713                        adt7310_show_t_alarm_low, adt7310_set_t_alarm_low, 0);
 714 static IIO_DEVICE_ATTR(t_crit,
 715                        S_IRUGO | S_IWUSR,
 716                        adt7310_show_t_crit, adt7310_set_t_crit, 0);
 717 static IIO_DEVICE_ATTR(t_hyst,
 718                        S_IRUGO | S_IWUSR,
 719                        adt7310_show_t_hyst, adt7310_set_t_hyst, 0);
 720
 721 static struct attribute *adt7310_event_int_attributes[] = {
 722         &iio_dev_attr_event_mode.dev_attr.attr,
 723         &iio_dev_attr_available_event_modes.dev_attr.attr,
 724         &iio_dev_attr_fault_queue.dev_attr.attr,
 725         &iio_dev_attr_t_alarm_high.dev_attr.attr,
 726         &iio_dev_attr_t_alarm_low.dev_attr.attr,
 727         &iio_dev_attr_t_hyst.dev_attr.attr,
 728         NULL,
 729 };
 730
 731 static struct attribute *adt7310_event_ct_attributes[] = {
 732         &iio_dev_attr_event_mode.dev_attr.attr,
 733         &iio_dev_attr_available_event_modes.dev_attr.attr,
 734         &iio_dev_attr_fault_queue.dev_attr.attr,
 735         &iio_dev_attr_t_crit.dev_attr.attr,
 736         &iio_dev_attr_t_hyst.dev_attr.attr,
 737         NULL,
 738 };
 739
 740 static struct attribute_group adt7310_event_attribute_group[ADT7310_IRQS] = {
 741         {
 742                 .attrs = adt7310_event_int_attributes,
 743         }, {
 744                 .attrs = adt7310_event_ct_attributes,
 745         }
 746 };
 747
 748 static const struct iio_info adt7310_info = {
 749         .attrs = &adt7310_attribute_group,
 750         .num_interrupt_lines = ADT7310_IRQS,
 751         .event_attrs = adt7310_event_attribute_group,
 752         .driver_module = THIS_MODULE,
 753 };
 754
 755 /*
 756  * device probe and remove
 757  */
 758
 759 static int __devinit adt7310_probe(struct spi_device *spi_dev)
 760 {
 761         struct adt7310_chip_info *chip;
 762         struct iio_dev *indio_dev;
 763         int ret = 0;
 764         unsigned long *adt7310_platform_data = spi_dev->dev.platform_data;
 765         unsigned long irq_flags;
 766
 767         indio_dev = iio_allocate_device(sizeof(*chip));
 768         if (indio_dev == NULL) {
 769                 ret = -ENOMEM;
 770                 goto error_ret;
 771         }
 772         chip = iio_priv(indio_dev);
 773         /* this is only used for device removal purposes */
 774         dev_set_drvdata(&spi_dev->dev, indio_dev);
 775
 776         chip->spi_dev = spi_dev;
 777
 778         indio_dev->dev.parent = &spi_dev->dev;
 779         indio_dev->name = spi_get_device_id(spi_dev)->name;
 780         indio_dev->info = &adt7310_info;
 781         indio_dev->modes = INDIO_DIRECT_MODE;
 782
 783         ret = iio_device_register(indio_dev);
 784         if (ret)
 785                 goto error_free_dev;
 786
 787         /* CT critcal temperature event. line 0 */
 788         if (spi_dev->irq) {
 789                 if (adt7310_platform_data[2])
 790                         irq_flags = adt7310_platform_data[2];
 791                 else
 792                         irq_flags = IRQF_TRIGGER_LOW;
 793                 ret = request_threaded_irq(spi_dev->irq,
 794                                            NULL,
 795                                            &adt7310_event_handler,
 796                                            irq_flags,
 797                                            indio_dev->name,
 798                                            indio_dev);
 799                 if (ret)
 800                         goto error_unreg_dev;
 801         }
 802
 803         /* INT bound temperature alarm event. line 1 */
 804         if (adt7310_platform_data[0]) {
 805                 ret = request_threaded_irq(adt7310_platform_data[0],
 806                                            NULL,
 807                                            &adt7310_event_handler,
 808                                            adt7310_platform_data[1],
 809                                            indio_dev->name,
 810                                            indio_dev);
 811                 if (ret)
 812                         goto error_unreg_ct_irq;
 813         }
 814
 815         if (spi_dev->irq && adt7310_platform_data[0]) {
 816                 ret = adt7310_spi_read_byte(chip, ADT7310_CONFIG, &chip->config);
 817                 if (ret) {
 818                         ret = -EIO;
 819                         goto error_unreg_int_irq;
 820                 }
 821
 822                 /* set irq polarity low level */
 823                 chip->config &= ~ADT7310_CT_POLARITY;
 824
 825                 if (adt7310_platform_data[1] & IRQF_TRIGGER_HIGH)
 826                         chip->config |= ADT7310_INT_POLARITY;
 827                 else
 828                         chip->config &= ~ADT7310_INT_POLARITY;
 829
 830                 ret = adt7310_spi_write_byte(chip, ADT7310_CONFIG, chip->config);
 831                 if (ret) {
 832                         ret = -EIO;
 833                         goto error_unreg_int_irq;
 834                 }
 835         }
 836
 837         dev_info(&spi_dev->dev, "%s temperature sensor registered.\n",
 838                         indio_dev->name);
 839
 840         return 0;
 841
 842 error_unreg_int_irq:
 843         free_irq(adt7310_platform_data[0], indio_dev);
 844 error_unreg_ct_irq:
 845         free_irq(spi_dev->irq, indio_dev);
 846 error_unreg_dev:
 847         iio_device_unregister(indio_dev);
 848 error_free_dev:
 849         iio_free_device(indio_dev);
 850 error_ret:
 851         return ret;
 852 }
 853
 854 static int __devexit adt7310_remove(struct spi_device *spi_dev)
 855 {
 856         struct iio_dev *indio_dev = dev_get_drvdata(&spi_dev->dev);
 857         unsigned long *adt7310_platform_data = spi_dev->dev.platform_data;
 858
 859         dev_set_drvdata(&spi_dev->dev, NULL);
 860         if (adt7310_platform_data[0])
 861                 free_irq(adt7310_platform_data[0], indio_dev);
 862         if (spi_dev->irq)
 863                 free_irq(spi_dev->irq, indio_dev);
 864         iio_device_unregister(indio_dev);
 865         iio_free_device(indio_dev);
 866
 867         return 0;
 868 }
 869
 870 static const struct spi_device_id adt7310_id[] = {
 871         { "adt7310", 0 },
 872         {}
 873 };
 874
 875 MODULE_DEVICE_TABLE(spi, adt7310_id);
 876
 877 static struct spi_driver adt7310_driver = {
 878         .driver = {
 879                 .name = "adt7310",
 880                 .bus = &spi_bus_type,
 881                 .owner = THIS_MODULE,
 882         },
 883         .probe = adt7310_probe,
 884         .remove = __devexit_p(adt7310_remove),
 885         .id_table = adt7310_id,
 886 };
 887
 888 static __init int adt7310_init(void)
 889 {
 890         return spi_register_driver(&adt7310_driver);
 891 }
 892
 893 static __exit void adt7310_exit(void)
 894 {
 895         spi_unregister_driver(&adt7310_driver);
 896 }
 897
 898 MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
 899 MODULE_DESCRIPTION("Analog Devices ADT7310 digital"
 900                         " temperature sensor driver");
 901 MODULE_LICENSE("GPL v2");
 902
 903 module_init(adt7310_init);
 904 module_exit(adt7310_exit);