drivers/staging/iio/adc/adt7410.c

   1 /*
   2  * ADT7410 digital temperature sensor driver supporting ADT7410
   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/i2c.h>
  16
  17 #include "../iio.h"
  18 #include "../sysfs.h"
  19
  20 /*
  21  * ADT7410 registers definition
  22  */
  23
  24 #define ADT7410_TEMPERATURE             0
  25 #define ADT7410_STATUS                  2
  26 #define ADT7410_CONFIG                  3
  27 #define ADT7410_T_ALARM_HIGH            4
  28 #define ADT7410_T_ALARM_LOW             6
  29 #define ADT7410_T_CRIT                  8
  30 #define ADT7410_T_HYST                  0xA
  31 #define ADT7410_ID                      0xB
  32 #define ADT7410_RESET                   0x2F
  33
  34 /*
  35  * ADT7410 status
  36  */
  37 #define ADT7410_STAT_T_LOW              0x10
  38 #define ADT7410_STAT_T_HIGH             0x20
  39 #define ADT7410_STAT_T_CRIT             0x40
  40 #define ADT7410_STAT_NOT_RDY            0x80
  41
  42 /*
  43  * ADT7410 config
  44  */
  45 #define ADT7410_FAULT_QUEUE_MASK        0x3
  46 #define ADT7410_CT_POLARITY             0x4
  47 #define ADT7410_INT_POLARITY            0x8
  48 #define ADT7410_EVENT_MODE              0x10
  49 #define ADT7410_MODE_MASK               0x60
  50 #define ADT7410_ONESHOT                 0x20
  51 #define ADT7410_SPS                     0x40
  52 #define ADT7410_PD                      0x60
  53 #define ADT7410_RESOLUTION              0x80
  54
  55 /*
  56  * ADT7410 masks
  57  */
  58 #define ADT7410_T16_VALUE_SIGN                  0x8000
  59 #define ADT7410_T16_VALUE_FLOAT_OFFSET          7
  60 #define ADT7410_T16_VALUE_FLOAT_MASK            0x7F
  61 #define ADT7410_T13_VALUE_SIGN                  0x1000
  62 #define ADT7410_T13_VALUE_OFFSET                3
  63 #define ADT7410_T13_VALUE_FLOAT_OFFSET          4
  64 #define ADT7410_T13_VALUE_FLOAT_MASK            0xF
  65 #define ADT7410_T_HYST_MASK                     0xF
  66 #define ADT7410_DEVICE_ID_MASK                  0xF
  67 #define ADT7410_MANUFACTORY_ID_MASK             0xF0
  68 #define ADT7410_MANUFACTORY_ID_OFFSET           4
  69
  70 #define ADT7410_IRQS                            2
  71
  72 /*
  73  * struct adt7410_chip_info - chip specifc information
  74  */
  75
  76 struct adt7410_chip_info {
  77         struct i2c_client *client;
  78         struct iio_dev *indio_dev;
  79         u8  config;
  80 };
  81
  82 /*
  83  * adt7410 register access by I2C
  84  */
  85
  86 static int adt7410_i2c_read_word(struct adt7410_chip_info *chip, u8 reg, u16 *data)
  87 {
  88         struct i2c_client *client = chip->client;
  89         int ret = 0;
  90
  91         ret = i2c_smbus_read_word_data(client, reg);
  92         if (ret < 0) {
  93                 dev_err(&client->dev, "I2C read error\n");
  94                 return ret;
  95         }
  96
  97         *data = swab16((u16)ret);
  98
  99         return 0;
 100 }
 101
 102 static int adt7410_i2c_write_word(struct adt7410_chip_info *chip, u8 reg, u16 data)
 103 {
 104         struct i2c_client *client = chip->client;
 105         int ret = 0;
 106
 107         ret = i2c_smbus_write_word_data(client, reg, swab16(data));
 108         if (ret < 0)
 109                 dev_err(&client->dev, "I2C write error\n");
 110
 111         return ret;
 112 }
 113
 114 static int adt7410_i2c_read_byte(struct adt7410_chip_info *chip, u8 reg, u8 *data)
 115 {
 116         struct i2c_client *client = chip->client;
 117         int ret = 0;
 118
 119         ret = i2c_smbus_read_byte_data(client, reg);
 120         if (ret < 0) {
 121                 dev_err(&client->dev, "I2C read error\n");
 122                 return ret;
 123         }
 124
 125         *data = (u8)ret;
 126
 127         return 0;
 128 }
 129
 130 static int adt7410_i2c_write_byte(struct adt7410_chip_info *chip, u8 reg, u8 data)
 131 {
 132         struct i2c_client *client = chip->client;
 133         int ret = 0;
 134
 135         ret = i2c_smbus_write_byte_data(client, reg, data);
 136         if (ret < 0)
 137                 dev_err(&client->dev, "I2C write error\n");
 138
 139         return ret;
 140 }
 141
 142 static ssize_t adt7410_show_mode(struct device *dev,
 143                 struct device_attribute *attr,
 144                 char *buf)
 145 {
 146         struct iio_dev *dev_info = dev_get_drvdata(dev);
 147         struct adt7410_chip_info *chip = dev_info->dev_data;
 148         u8 config;
 149
 150         config = chip->config & ADT7410_MODE_MASK;
 151
 152         switch (config) {
 153         case ADT7410_PD:
 154                 return sprintf(buf, "power-down\n");
 155         case ADT7410_ONESHOT:
 156                 return sprintf(buf, "one-shot\n");
 157         case ADT7410_SPS:
 158                 return sprintf(buf, "sps\n");
 159         default:
 160                 return sprintf(buf, "full\n");
 161         }
 162 }
 163
 164 static ssize_t adt7410_store_mode(struct device *dev,
 165                 struct device_attribute *attr,
 166                 const char *buf,
 167                 size_t len)
 168 {
 169         struct iio_dev *dev_info = dev_get_drvdata(dev);
 170         struct adt7410_chip_info *chip = dev_info->dev_data;
 171         u16 config;
 172         int ret;
 173
 174         ret = adt7410_i2c_read_byte(chip, ADT7410_CONFIG, &chip->config);
 175         if (ret)
 176                 return -EIO;
 177
 178         config = chip->config & (~ADT7410_MODE_MASK);
 179         if (strcmp(buf, "power-down"))
 180                 config |= ADT7410_PD;
 181         else if (strcmp(buf, "one-shot"))
 182                 config |= ADT7410_ONESHOT;
 183         else if (strcmp(buf, "sps"))
 184                 config |= ADT7410_SPS;
 185
 186         ret = adt7410_i2c_write_byte(chip, ADT7410_CONFIG, config);
 187         if (ret)
 188                 return -EIO;
 189
 190         chip->config = config;
 191
 192         return ret;
 193 }
 194
 195 static IIO_DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
 196                 adt7410_show_mode,
 197                 adt7410_store_mode,
 198                 0);
 199
 200 static ssize_t adt7410_show_available_modes(struct device *dev,
 201                 struct device_attribute *attr,
 202                 char *buf)
 203 {
 204         return sprintf(buf, "full\none-shot\nsps\npower-down\n");
 205 }
 206
 207 static IIO_DEVICE_ATTR(available_modes, S_IRUGO, adt7410_show_available_modes, NULL, 0);
 208
 209 static ssize_t adt7410_show_resolution(struct device *dev,
 210                 struct device_attribute *attr,
 211                 char *buf)
 212 {
 213         struct iio_dev *dev_info = dev_get_drvdata(dev);
 214         struct adt7410_chip_info *chip = dev_info->dev_data;
 215         int ret;
 216         int bits;
 217
 218         ret = adt7410_i2c_read_byte(chip, ADT7410_CONFIG, &chip->config);
 219         if (ret)
 220                 return -EIO;
 221
 222         if (chip->config & ADT7410_RESOLUTION)
 223                 bits = 16;
 224         else
 225                 bits = 13;
 226
 227         return sprintf(buf, "%d bits\n", bits);
 228 }
 229
 230 static ssize_t adt7410_store_resolution(struct device *dev,
 231                 struct device_attribute *attr,
 232                 const char *buf,
 233                 size_t len)
 234 {
 235         struct iio_dev *dev_info = dev_get_drvdata(dev);
 236         struct adt7410_chip_info *chip = dev_info->dev_data;
 237         unsigned long data;
 238         u16 config;
 239         int ret;
 240
 241         ret = strict_strtoul(buf, 10, &data);
 242         if (ret)
 243                 return -EINVAL;
 244
 245         ret = adt7410_i2c_read_byte(chip, ADT7410_CONFIG, &chip->config);
 246         if (ret)
 247                 return -EIO;
 248
 249         config = chip->config & (~ADT7410_RESOLUTION);
 250         if (data)
 251                 config |= ADT7410_RESOLUTION;
 252
 253         ret = adt7410_i2c_write_byte(chip, ADT7410_CONFIG, config);
 254         if (ret)
 255                 return -EIO;
 256
 257         chip->config = config;
 258
 259         return ret;
 260 }
 261
 262 static IIO_DEVICE_ATTR(resolution, S_IRUGO | S_IWUSR,
 263                 adt7410_show_resolution,
 264                 adt7410_store_resolution,
 265                 0);
 266
 267 static ssize_t adt7410_show_id(struct device *dev,
 268                 struct device_attribute *attr,
 269                 char *buf)
 270 {
 271         struct iio_dev *dev_info = dev_get_drvdata(dev);
 272         struct adt7410_chip_info *chip = dev_info->dev_data;
 273         u8 id;
 274         int ret;
 275
 276         ret = adt7410_i2c_read_byte(chip, ADT7410_ID, &id);
 277         if (ret)
 278                 return -EIO;
 279
 280         return sprintf(buf, "device id: 0x%x\nmanufactory id: 0x%x\n",
 281                         id & ADT7410_DEVICE_ID_MASK,
 282                         (id & ADT7410_MANUFACTORY_ID_MASK) >> ADT7410_MANUFACTORY_ID_OFFSET);
 283 }
 284
 285 static IIO_DEVICE_ATTR(id, S_IRUGO | S_IWUSR,
 286                 adt7410_show_id,
 287                 NULL,
 288                 0);
 289
 290 static ssize_t adt7410_convert_temperature(struct adt7410_chip_info *chip,
 291                 u16 data, char *buf)
 292 {
 293         char sign = ' ';
 294
 295         if (chip->config & ADT7410_RESOLUTION) {
 296                 if (data & ADT7410_T16_VALUE_SIGN) {
 297                         /* convert supplement to positive value */
 298                         data = (u16)((ADT7410_T16_VALUE_SIGN << 1) - (u32)data);
 299                         sign = '-';
 300                 }
 301                 return sprintf(buf, "%c%d.%.7d\n", sign,
 302                                 (data >> ADT7410_T16_VALUE_FLOAT_OFFSET),
 303                                 (data & ADT7410_T16_VALUE_FLOAT_MASK) * 78125);
 304         } else {
 305                 if (data & ADT7410_T13_VALUE_SIGN) {
 306                         /* convert supplement to positive value */
 307                         data >>= ADT7410_T13_VALUE_OFFSET;
 308                         data = (ADT7410_T13_VALUE_SIGN << 1) - data;
 309                         sign = '-';
 310                 }
 311                 return sprintf(buf, "%c%d.%.4d\n", sign,
 312                                 (data >> ADT7410_T13_VALUE_FLOAT_OFFSET),
 313                                 (data & ADT7410_T13_VALUE_FLOAT_MASK) * 625);
 314         }
 315 }
 316
 317 static ssize_t adt7410_show_value(struct device *dev,
 318                 struct device_attribute *attr,
 319                 char *buf)
 320 {
 321         struct iio_dev *dev_info = dev_get_drvdata(dev);
 322         struct adt7410_chip_info *chip = dev_info->dev_data;
 323         u8 status;
 324         u16 data;
 325         int ret, i = 0;
 326
 327         do {
 328                 ret = adt7410_i2c_read_byte(chip, ADT7410_STATUS, &status);
 329                 if (ret)
 330                         return -EIO;
 331                 i++;
 332                 if (i == 10000)
 333                         return -EIO;
 334         } while (status & ADT7410_STAT_NOT_RDY);
 335
 336         ret = adt7410_i2c_read_word(chip, ADT7410_TEMPERATURE, &data);
 337         if (ret)
 338                 return -EIO;
 339
 340         return adt7410_convert_temperature(chip, data, buf);
 341 }
 342
 343 static IIO_DEVICE_ATTR(value, S_IRUGO, adt7410_show_value, NULL, 0);
 344
 345 static struct attribute *adt7410_attributes[] = {
 346         &iio_dev_attr_available_modes.dev_attr.attr,
 347         &iio_dev_attr_mode.dev_attr.attr,
 348         &iio_dev_attr_resolution.dev_attr.attr,
 349         &iio_dev_attr_id.dev_attr.attr,
 350         &iio_dev_attr_value.dev_attr.attr,
 351         NULL,
 352 };
 353
 354 static const struct attribute_group adt7410_attribute_group = {
 355         .attrs = adt7410_attributes,
 356 };
 357
 358 /*
 359  * temperature bound events
 360  */
 361
 362 #define IIO_EVENT_CODE_ADT7410_ABOVE_ALARM    IIO_BUFFER_EVENT_CODE(0)
 363 #define IIO_EVENT_CODE_ADT7410_BELLOW_ALARM   IIO_BUFFER_EVENT_CODE(1)
 364 #define IIO_EVENT_CODE_ADT7410_ABOVE_CRIT     IIO_BUFFER_EVENT_CODE(2)
 365
 366 static irqreturn_t adt7410_event_handler(int irq, void *private)
 367 {
 368         struct iio_dev *indio_dev = private;
 369         struct adt7410_chip_info *chip = iio_dev_get_devdata(indio_dev);
 370         s64 timestamp = iio_get_time_ns();
 371         u8 status;
 372
 373         if (adt7410_i2c_read_byte(chip, ADT7410_STATUS, &status))
 374                 return IRQ_HANDLED;
 375
 376         if (status & ADT7410_STAT_T_HIGH)
 377                 iio_push_event(indio_dev, 0,
 378                         IIO_EVENT_CODE_ADT7410_ABOVE_ALARM,
 379                         timestamp);
 380         if (status & ADT7410_STAT_T_LOW)
 381                 iio_push_event(indio_dev, 0,
 382                         IIO_EVENT_CODE_ADT7410_BELLOW_ALARM,
 383                         timestamp);
 384         if (status & ADT7410_STAT_T_CRIT)
 385                 iio_push_event(indio_dev, 0,
 386                         IIO_EVENT_CODE_ADT7410_ABOVE_CRIT,
 387                         timestamp);
 388
 389         return IRQ_HANDLED;
 390 }
 391
 392 static ssize_t adt7410_show_event_mode(struct device *dev,
 393                 struct device_attribute *attr,
 394                 char *buf)
 395 {
 396         struct iio_dev *dev_info = dev_get_drvdata(dev);
 397         struct adt7410_chip_info *chip = dev_info->dev_data;
 398         int ret;
 399
 400         ret = adt7410_i2c_read_byte(chip, ADT7410_CONFIG, &chip->config);
 401         if (ret)
 402                 return -EIO;
 403
 404         if (chip->config & ADT7410_EVENT_MODE)
 405                 return sprintf(buf, "interrupt\n");
 406         else
 407                 return sprintf(buf, "comparator\n");
 408 }
 409
 410 static ssize_t adt7410_set_event_mode(struct device *dev,
 411                 struct device_attribute *attr,
 412                 const char *buf,
 413                 size_t len)
 414 {
 415         struct iio_dev *dev_info = dev_get_drvdata(dev);
 416         struct adt7410_chip_info *chip = dev_info->dev_data;
 417         u16 config;
 418         int ret;
 419
 420         ret = adt7410_i2c_read_byte(chip, ADT7410_CONFIG, &chip->config);
 421         if (ret)
 422                 return -EIO;
 423
 424         config = chip->config &= ~ADT7410_EVENT_MODE;
 425         if (strcmp(buf, "comparator") != 0)
 426                 config |= ADT7410_EVENT_MODE;
 427
 428         ret = adt7410_i2c_write_byte(chip, ADT7410_CONFIG, config);
 429         if (ret)
 430                 return -EIO;
 431
 432         chip->config = config;
 433
 434         return ret;
 435 }
 436
 437 static ssize_t adt7410_show_available_event_modes(struct device *dev,
 438                 struct device_attribute *attr,
 439                 char *buf)
 440 {
 441         return sprintf(buf, "comparator\ninterrupt\n");
 442 }
 443
 444 static ssize_t adt7410_show_fault_queue(struct device *dev,
 445                 struct device_attribute *attr,
 446                 char *buf)
 447 {
 448         struct iio_dev *dev_info = dev_get_drvdata(dev);
 449         struct adt7410_chip_info *chip = dev_info->dev_data;
 450         int ret;
 451
 452         ret = adt7410_i2c_read_byte(chip, ADT7410_CONFIG, &chip->config);
 453         if (ret)
 454                 return -EIO;
 455
 456         return sprintf(buf, "%d\n", chip->config & ADT7410_FAULT_QUEUE_MASK);
 457 }
 458
 459 static ssize_t adt7410_set_fault_queue(struct device *dev,
 460                 struct device_attribute *attr,
 461                 const char *buf,
 462                 size_t len)
 463 {
 464         struct iio_dev *dev_info = dev_get_drvdata(dev);
 465         struct adt7410_chip_info *chip = dev_info->dev_data;
 466         unsigned long data;
 467         int ret;
 468         u8 config;
 469
 470         ret = strict_strtoul(buf, 10, &data);
 471         if (ret || data > 3)
 472                 return -EINVAL;
 473
 474         ret = adt7410_i2c_read_byte(chip, ADT7410_CONFIG, &chip->config);
 475         if (ret)
 476                 return -EIO;
 477
 478         config = chip->config & ~ADT7410_FAULT_QUEUE_MASK;
 479         config |= data;
 480         ret = adt7410_i2c_write_byte(chip, ADT7410_CONFIG, config);
 481         if (ret)
 482                 return -EIO;
 483
 484         chip->config = config;
 485
 486         return ret;
 487 }
 488
 489 static inline ssize_t adt7410_show_t_bound(struct device *dev,
 490                 struct device_attribute *attr,
 491                 u8 bound_reg,
 492                 char *buf)
 493 {
 494         struct iio_dev *dev_info = dev_get_drvdata(dev);
 495         struct adt7410_chip_info *chip = dev_info->dev_data;
 496         u16 data;
 497         int ret;
 498
 499         ret = adt7410_i2c_read_word(chip, bound_reg, &data);
 500         if (ret)
 501                 return -EIO;
 502
 503         return adt7410_convert_temperature(chip, data, buf);
 504 }
 505
 506 static inline ssize_t adt7410_set_t_bound(struct device *dev,
 507                 struct device_attribute *attr,
 508                 u8 bound_reg,
 509                 const char *buf,
 510                 size_t len)
 511 {
 512         struct iio_dev *dev_info = dev_get_drvdata(dev);
 513         struct adt7410_chip_info *chip = dev_info->dev_data;
 514         long tmp1, tmp2;
 515         u16 data;
 516         char *pos;
 517         int ret;
 518
 519         pos = strchr(buf, '.');
 520
 521         ret = strict_strtol(buf, 10, &tmp1);
 522
 523         if (ret || tmp1 > 127 || tmp1 < -128)
 524                 return -EINVAL;
 525
 526         if (pos) {
 527                 len = strlen(pos);
 528
 529                 if (chip->config & ADT7410_RESOLUTION) {
 530                         if (len > ADT7410_T16_VALUE_FLOAT_OFFSET)
 531                                 len = ADT7410_T16_VALUE_FLOAT_OFFSET;
 532                         pos[len] = 0;
 533                         ret = strict_strtol(pos, 10, &tmp2);
 534
 535                         if (!ret)
 536                                 tmp2 = (tmp2 / 78125) * 78125;
 537                 } else {
 538                         if (len > ADT7410_T13_VALUE_FLOAT_OFFSET)
 539                                 len = ADT7410_T13_VALUE_FLOAT_OFFSET;
 540                         pos[len] = 0;
 541                         ret = strict_strtol(pos, 10, &tmp2);
 542
 543                         if (!ret)
 544                                 tmp2 = (tmp2 / 625) * 625;
 545                 }
 546         }
 547
 548         if (tmp1 < 0)
 549                 data = (u16)(-tmp1);
 550         else
 551                 data = (u16)tmp1;
 552
 553         if (chip->config & ADT7410_RESOLUTION) {
 554                 data = (data << ADT7410_T16_VALUE_FLOAT_OFFSET) |
 555                         (tmp2 & ADT7410_T16_VALUE_FLOAT_MASK);
 556
 557                 if (tmp1 < 0)
 558                         /* convert positive value to supplyment */
 559                         data = (u16)((ADT7410_T16_VALUE_SIGN << 1) - (u32)data);
 560         } else {
 561                 data = (data << ADT7410_T13_VALUE_FLOAT_OFFSET) |
 562                         (tmp2 & ADT7410_T13_VALUE_FLOAT_MASK);
 563
 564                 if (tmp1 < 0)
 565                         /* convert positive value to supplyment */
 566                         data = (ADT7410_T13_VALUE_SIGN << 1) - data;
 567                 data <<= ADT7410_T13_VALUE_OFFSET;
 568         }
 569
 570         ret = adt7410_i2c_write_word(chip, bound_reg, data);
 571         if (ret)
 572                 return -EIO;
 573
 574         return ret;
 575 }
 576
 577 static ssize_t adt7410_show_t_alarm_high(struct device *dev,
 578                 struct device_attribute *attr,
 579                 char *buf)
 580 {
 581         return adt7410_show_t_bound(dev, attr,
 582                         ADT7410_T_ALARM_HIGH, buf);
 583 }
 584
 585 static inline ssize_t adt7410_set_t_alarm_high(struct device *dev,
 586                 struct device_attribute *attr,
 587                 const char *buf,
 588                 size_t len)
 589 {
 590         return adt7410_set_t_bound(dev, attr,
 591                         ADT7410_T_ALARM_HIGH, buf, len);
 592 }
 593
 594 static ssize_t adt7410_show_t_alarm_low(struct device *dev,
 595                 struct device_attribute *attr,
 596                 char *buf)
 597 {
 598         return adt7410_show_t_bound(dev, attr,
 599                         ADT7410_T_ALARM_LOW, buf);
 600 }
 601
 602 static inline ssize_t adt7410_set_t_alarm_low(struct device *dev,
 603                 struct device_attribute *attr,
 604                 const char *buf,
 605                 size_t len)
 606 {
 607         return adt7410_set_t_bound(dev, attr,
 608                         ADT7410_T_ALARM_LOW, buf, len);
 609 }
 610
 611 static ssize_t adt7410_show_t_crit(struct device *dev,
 612                 struct device_attribute *attr,
 613                 char *buf)
 614 {
 615         return adt7410_show_t_bound(dev, attr,
 616                         ADT7410_T_CRIT, buf);
 617 }
 618
 619 static inline ssize_t adt7410_set_t_crit(struct device *dev,
 620                 struct device_attribute *attr,
 621                 const char *buf,
 622                 size_t len)
 623 {
 624         return adt7410_set_t_bound(dev, attr,
 625                         ADT7410_T_CRIT, buf, len);
 626 }
 627
 628 static ssize_t adt7410_show_t_hyst(struct device *dev,
 629                 struct device_attribute *attr,
 630                 char *buf)
 631 {
 632         struct iio_dev *dev_info = dev_get_drvdata(dev);
 633         struct adt7410_chip_info *chip = dev_info->dev_data;
 634         int ret;
 635         u8 t_hyst;
 636
 637         ret = adt7410_i2c_read_byte(chip, ADT7410_T_HYST, &t_hyst);
 638         if (ret)
 639                 return -EIO;
 640
 641         return sprintf(buf, "%d\n", t_hyst & ADT7410_T_HYST_MASK);
 642 }
 643
 644 static inline ssize_t adt7410_set_t_hyst(struct device *dev,
 645                 struct device_attribute *attr,
 646                 const char *buf,
 647                 size_t len)
 648 {
 649         struct iio_dev *dev_info = dev_get_drvdata(dev);
 650         struct adt7410_chip_info *chip = dev_info->dev_data;
 651         int ret;
 652         unsigned long data;
 653         u8 t_hyst;
 654
 655         ret = strict_strtol(buf, 10, &data);
 656
 657         if (ret || data > ADT7410_T_HYST_MASK)
 658                 return -EINVAL;
 659
 660         t_hyst = (u8)data;
 661
 662         ret = adt7410_i2c_write_byte(chip, ADT7410_T_HYST, t_hyst);
 663         if (ret)
 664                 return -EIO;
 665
 666         return ret;
 667 }
 668
 669 static IIO_DEVICE_ATTR(event_mode,
 670                        S_IRUGO | S_IWUSR,
 671                        adt7410_show_event_mode, adt7410_set_event_mode, 0);
 672 static IIO_DEVICE_ATTR(available_event_modes,
 673                        S_IRUGO,
 674                        adt7410_show_available_event_modes, NULL, 0);
 675 static IIO_DEVICE_ATTR(fault_queue,
 676                        S_IRUGO | S_IWUSR,
 677                        adt7410_show_fault_queue, adt7410_set_fault_queue, 0);
 678 static IIO_DEVICE_ATTR(t_alarm_high,
 679                        S_IRUGO | S_IWUSR,
 680                        adt7410_show_t_alarm_high, adt7410_set_t_alarm_high, 0);
 681 static IIO_DEVICE_ATTR(t_alarm_low,
 682                        S_IRUGO | S_IWUSR,
 683                        adt7410_show_t_alarm_low, adt7410_set_t_alarm_low, 0);
 684 static IIO_DEVICE_ATTR(t_crit,
 685                        S_IRUGO | S_IWUSR,
 686                        adt7410_show_t_crit, adt7410_set_t_crit, 0);
 687 static IIO_DEVICE_ATTR(t_hyst,
 688                        S_IRUGO | S_IWUSR,
 689                        adt7410_show_t_hyst, adt7410_set_t_hyst, 0);
 690
 691 static struct attribute *adt7410_event_int_attributes[] = {
 692         &iio_dev_attr_event_mode.dev_attr.attr,
 693         &iio_dev_attr_available_event_modes.dev_attr.attr,
 694         &iio_dev_attr_fault_queue.dev_attr.attr,
 695         &iio_dev_attr_t_alarm_high.dev_attr.attr,
 696         &iio_dev_attr_t_alarm_low.dev_attr.attr,
 697         &iio_dev_attr_t_hyst.dev_attr.attr,
 698         NULL,
 699 };
 700
 701 static struct attribute *adt7410_event_ct_attributes[] = {
 702         &iio_dev_attr_event_mode.dev_attr.attr,
 703         &iio_dev_attr_available_event_modes.dev_attr.attr,
 704         &iio_dev_attr_fault_queue.dev_attr.attr,
 705         &iio_dev_attr_t_crit.dev_attr.attr,
 706         &iio_dev_attr_t_hyst.dev_attr.attr,
 707         NULL,
 708 };
 709
 710 static struct attribute_group adt7410_event_attribute_group[ADT7410_IRQS] = {
 711         {
 712                 .attrs = adt7410_event_int_attributes,
 713         }, {
 714                 .attrs = adt7410_event_ct_attributes,
 715         }
 716 };
 717
 718 /*
 719  * device probe and remove
 720  */
 721
 722 static int __devinit adt7410_probe(struct i2c_client *client,
 723                 const struct i2c_device_id *id)
 724 {
 725         struct adt7410_chip_info *chip;
 726         int ret = 0;
 727         unsigned long *adt7410_platform_data = client->dev.platform_data;
 728
 729         chip = kzalloc(sizeof(struct adt7410_chip_info), GFP_KERNEL);
 730
 731         if (chip == NULL)
 732                 return -ENOMEM;
 733
 734         /* this is only used for device removal purposes */
 735         i2c_set_clientdata(client, chip);
 736
 737         chip->client = client;
 738
 739         chip->indio_dev = iio_allocate_device(0);
 740         if (chip->indio_dev == NULL) {
 741                 ret = -ENOMEM;
 742                 goto error_free_chip;
 743         }
 744         chip->indio_dev->name = id->name;
 745         chip->indio_dev->dev.parent = &client->dev;
 746         chip->indio_dev->attrs = &adt7410_attribute_group;
 747         chip->indio_dev->event_attrs = adt7410_event_attribute_group;
 748         chip->indio_dev->dev_data = (void *)chip;
 749         chip->indio_dev->driver_module = THIS_MODULE;
 750         chip->indio_dev->num_interrupt_lines = ADT7410_IRQS;
 751         chip->indio_dev->modes = INDIO_DIRECT_MODE;
 752
 753         ret = iio_device_register(chip->indio_dev);
 754         if (ret)
 755                 goto error_free_dev;
 756
 757         /* CT critcal temperature event. line 0 */
 758         if (client->irq) {
 759                 ret = request_threaded_irq(client->irq,
 760                                            NULL,
 761                                            &adt7410_event_handler,
 762                                            IRQF_TRIGGER_LOW,
 763                                            id->name,
 764                                            chip->indio_dev);
 765                 if (ret)
 766                         goto error_unreg_dev;
 767         }
 768
 769         /* INT bound temperature alarm event. line 1 */
 770         if (adt7410_platform_data[0]) {
 771                 ret = request_threaded_irq(adt7410_platform_data[0],
 772                                            NULL,
 773                                            &adt7410_event_handler,
 774                                            adt7410_platform_data[1],
 775                                            id->name,
 776                                            chip->indio_dev);
 777                 if (ret)
 778                         goto error_unreg_ct_irq;
 779         }
 780
 781         if (client->irq && adt7410_platform_data[0]) {
 782
 783                 ret = adt7410_i2c_read_byte(chip, ADT7410_CONFIG, &chip->config);
 784                 if (ret) {
 785                         ret = -EIO;
 786                         goto error_unreg_int_irq;
 787                 }
 788
 789                 /* set irq polarity low level */
 790                 chip->config &= ~ADT7410_CT_POLARITY;
 791
 792                 if (adt7410_platform_data[1] & IRQF_TRIGGER_HIGH)
 793                         chip->config |= ADT7410_INT_POLARITY;
 794                 else
 795                         chip->config &= ~ADT7410_INT_POLARITY;
 796
 797                 ret = adt7410_i2c_write_byte(chip, ADT7410_CONFIG, chip->config);
 798                 if (ret) {
 799                         ret = -EIO;
 800                         goto error_unreg_int_irq;
 801                 }
 802         }
 803
 804         dev_info(&client->dev, "%s temperature sensor registered.\n",
 805                          id->name);
 806
 807         return 0;
 808
 809 error_unreg_int_irq:
 810         free_irq(adt7410_platform_data[0], chip->indio_dev);
 811 error_unreg_ct_irq:
 812         free_irq(client->irq, chip->indio_dev);
 813 error_unreg_dev:
 814         iio_device_unregister(chip->indio_dev);
 815 error_free_dev:
 816         iio_free_device(chip->indio_dev);
 817 error_free_chip:
 818         kfree(chip);
 819
 820         return ret;
 821 }
 822
 823 static int __devexit adt7410_remove(struct i2c_client *client)
 824 {
 825         struct adt7410_chip_info *chip = i2c_get_clientdata(client);
 826         struct iio_dev *indio_dev = chip->indio_dev;
 827         unsigned long *adt7410_platform_data = client->dev.platform_data;
 828
 829         if (adt7410_platform_data[0])
 830                 free_irq(adt7410_platform_data[0], chip->indio_dev);
 831         if (client->irq)
 832                 free_irq(client->irq, chip->indio_dev);
 833         iio_device_unregister(indio_dev);
 834         iio_free_device(chip->indio_dev);
 835         kfree(chip);
 836
 837         return 0;
 838 }
 839
 840 static const struct i2c_device_id adt7410_id[] = {
 841         { "adt7410", 0 },
 842         {}
 843 };
 844
 845 MODULE_DEVICE_TABLE(i2c, adt7410_id);
 846
 847 static struct i2c_driver adt7410_driver = {
 848         .driver = {
 849                 .name = "adt7410",
 850         },
 851         .probe = adt7410_probe,
 852         .remove = __devexit_p(adt7410_remove),
 853         .id_table = adt7410_id,
 854 };
 855
 856 static __init int adt7410_init(void)
 857 {
 858         return i2c_add_driver(&adt7410_driver);
 859 }
 860
 861 static __exit void adt7410_exit(void)
 862 {
 863         i2c_del_driver(&adt7410_driver);
 864 }
 865
 866 MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
 867 MODULE_DESCRIPTION("Analog Devices ADT7410 digital"
 868                         " temperature sensor driver");
 869 MODULE_LICENSE("GPL v2");
 870
 871 module_init(adt7410_init);
 872 module_exit(adt7410_exit);