drivers/hwmon/max6697.c

   1 /*
   2  * Copyright (c) 2012 Guenter Roeck <linux@roeck-us.net>
   3  *
   4  * based on max1668.c
   5  * Copyright (c) 2011 David George <david.george@ska.ac.za>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/slab.h>
  21 #include <linux/jiffies.h>
  22 #include <linux/i2c.h>
  23 #include <linux/hwmon.h>
  24 #include <linux/hwmon-sysfs.h>
  25 #include <linux/err.h>
  26 #include <linux/mutex.h>
  27 #include <linux/of_device.h>
  28 #include <linux/of.h>
  29
  30 #include <linux/platform_data/max6697.h>
  31
  32 enum chips { max6581, max6602, max6622, max6636, max6689, max6693, max6694,
  33              max6697, max6698, max6699 };
  34
  35 /* Report local sensor as temp1 */
  36
  37 static const u8 MAX6697_REG_TEMP[] = {
  38                         0x07, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x08 };
  39 static const u8 MAX6697_REG_TEMP_EXT[] = {
  40                         0x57, 0x09, 0x52, 0x53, 0x54, 0x55, 0x56, 0 };
  41 static const u8 MAX6697_REG_MAX[] = {
  42                         0x17, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x18 };
  43 static const u8 MAX6697_REG_CRIT[] = {
  44                         0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27 };
  45
  46 /*
  47  * Map device tree / platform data register bit map to chip bit map.
  48  * Applies to alert register and over-temperature register.
  49  */
  50 #define MAX6697_ALERT_MAP_BITS(reg)     ((((reg) & 0x7e) >> 1) | \
  51                                  (((reg) & 0x01) << 6) | ((reg) & 0x80))
  52 #define MAX6697_OVERT_MAP_BITS(reg) (((reg) >> 1) | (((reg) & 0x01) << 7))
  53
  54 #define MAX6697_REG_STAT(n)             (0x44 + (n))
  55
  56 #define MAX6697_REG_CONFIG              0x41
  57 #define MAX6581_CONF_EXTENDED           (1 << 1)
  58 #define MAX6693_CONF_BETA               (1 << 2)
  59 #define MAX6697_CONF_RESISTANCE         (1 << 3)
  60 #define MAX6697_CONF_TIMEOUT            (1 << 5)
  61 #define MAX6697_REG_ALERT_MASK          0x42
  62 #define MAX6697_REG_OVERT_MASK          0x43
  63
  64 #define MAX6581_REG_RESISTANCE          0x4a
  65 #define MAX6581_REG_IDEALITY            0x4b
  66 #define MAX6581_REG_IDEALITY_SELECT     0x4c
  67 #define MAX6581_REG_OFFSET              0x4d
  68 #define MAX6581_REG_OFFSET_SELECT       0x4e
  69
  70 #define MAX6697_CONV_TIME               156     /* ms per channel, worst case */
  71
  72 struct max6697_chip_data {
  73         int channels;
  74         u32 have_ext;
  75         u32 have_crit;
  76         u32 have_fault;
  77         u8 valid_conf;
  78         const u8 *alarm_map;
  79 };
  80
  81 struct max6697_data {
  82         struct i2c_client *client;
  83
  84         enum chips type;
  85         const struct max6697_chip_data *chip;
  86
  87         int update_interval;    /* in milli-seconds */
  88         int temp_offset;        /* in degrees C */
  89
  90         struct mutex update_lock;
  91         unsigned long last_updated;     /* In jiffies */
  92         bool valid;             /* true if following fields are valid */
  93
  94         /* 1x local and up to 7x remote */
  95         u8 temp[8][4];          /* [nr][0]=temp [1]=ext [2]=max [3]=crit */
  96 #define MAX6697_TEMP_INPUT      0
  97 #define MAX6697_TEMP_EXT        1
  98 #define MAX6697_TEMP_MAX        2
  99 #define MAX6697_TEMP_CRIT       3
 100         u32 alarms;
 101 };
 102
 103 /* Diode fault status bits on MAX6581 are right shifted by one bit */
 104 static const u8 max6581_alarm_map[] = {
 105          0, 0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15,
 106          16, 17, 18, 19, 20, 21, 22, 23 };
 107
 108 static const struct max6697_chip_data max6697_chip_data[] = {
 109         [max6581] = {
 110                 .channels = 8,
 111                 .have_crit = 0xff,
 112                 .have_ext = 0x7f,
 113                 .have_fault = 0xfe,
 114                 .valid_conf = MAX6581_CONF_EXTENDED | MAX6697_CONF_TIMEOUT,
 115                 .alarm_map = max6581_alarm_map,
 116         },
 117         [max6602] = {
 118                 .channels = 5,
 119                 .have_crit = 0x12,
 120                 .have_ext = 0x02,
 121                 .have_fault = 0x1e,
 122                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 123         },
 124         [max6622] = {
 125                 .channels = 5,
 126                 .have_crit = 0x12,
 127                 .have_ext = 0x02,
 128                 .have_fault = 0x1e,
 129                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 130         },
 131         [max6636] = {
 132                 .channels = 7,
 133                 .have_crit = 0x72,
 134                 .have_ext = 0x02,
 135                 .have_fault = 0x7e,
 136                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 137         },
 138         [max6689] = {
 139                 .channels = 7,
 140                 .have_crit = 0x72,
 141                 .have_ext = 0x02,
 142                 .have_fault = 0x7e,
 143                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 144         },
 145         [max6693] = {
 146                 .channels = 7,
 147                 .have_crit = 0x72,
 148                 .have_ext = 0x02,
 149                 .have_fault = 0x7e,
 150                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
 151                   MAX6697_CONF_TIMEOUT,
 152         },
 153         [max6694] = {
 154                 .channels = 5,
 155                 .have_crit = 0x12,
 156                 .have_ext = 0x02,
 157                 .have_fault = 0x1e,
 158                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
 159                   MAX6697_CONF_TIMEOUT,
 160         },
 161         [max6697] = {
 162                 .channels = 7,
 163                 .have_crit = 0x72,
 164                 .have_ext = 0x02,
 165                 .have_fault = 0x7e,
 166                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 167         },
 168         [max6698] = {
 169                 .channels = 7,
 170                 .have_crit = 0x72,
 171                 .have_ext = 0x02,
 172                 .have_fault = 0x0e,
 173                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 174         },
 175         [max6699] = {
 176                 .channels = 5,
 177                 .have_crit = 0x12,
 178                 .have_ext = 0x02,
 179                 .have_fault = 0x1e,
 180                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 181         },
 182 };
 183
 184 static struct max6697_data *max6697_update_device(struct device *dev)
 185 {
 186         struct max6697_data *data = dev_get_drvdata(dev);
 187         struct i2c_client *client = data->client;
 188         struct max6697_data *ret = data;
 189         int val;
 190         int i;
 191         u32 alarms;
 192
 193         mutex_lock(&data->update_lock);
 194
 195         if (data->valid &&
 196             !time_after(jiffies, data->last_updated
 197                         + msecs_to_jiffies(data->update_interval)))
 198                 goto abort;
 199
 200         for (i = 0; i < data->chip->channels; i++) {
 201                 if (data->chip->have_ext & (1 << i)) {
 202                         val = i2c_smbus_read_byte_data(client,
 203                                                        MAX6697_REG_TEMP_EXT[i]);
 204                         if (unlikely(val < 0)) {
 205                                 ret = ERR_PTR(val);
 206                                 goto abort;
 207                         }
 208                         data->temp[i][MAX6697_TEMP_EXT] = val;
 209                 }
 210
 211                 val = i2c_smbus_read_byte_data(client, MAX6697_REG_TEMP[i]);
 212                 if (unlikely(val < 0)) {
 213                         ret = ERR_PTR(val);
 214                         goto abort;
 215                 }
 216                 data->temp[i][MAX6697_TEMP_INPUT] = val;
 217
 218                 val = i2c_smbus_read_byte_data(client, MAX6697_REG_MAX[i]);
 219                 if (unlikely(val < 0)) {
 220                         ret = ERR_PTR(val);
 221                         goto abort;
 222                 }
 223                 data->temp[i][MAX6697_TEMP_MAX] = val;
 224
 225                 if (data->chip->have_crit & (1 << i)) {
 226                         val = i2c_smbus_read_byte_data(client,
 227                                                        MAX6697_REG_CRIT[i]);
 228                         if (unlikely(val < 0)) {
 229                                 ret = ERR_PTR(val);
 230                                 goto abort;
 231                         }
 232                         data->temp[i][MAX6697_TEMP_CRIT] = val;
 233                 }
 234         }
 235
 236         alarms = 0;
 237         for (i = 0; i < 3; i++) {
 238                 val = i2c_smbus_read_byte_data(client, MAX6697_REG_STAT(i));
 239                 if (unlikely(val < 0)) {
 240                         ret = ERR_PTR(val);
 241                         goto abort;
 242                 }
 243                 alarms = (alarms << 8) | val;
 244         }
 245         data->alarms = alarms;
 246         data->last_updated = jiffies;
 247         data->valid = true;
 248 abort:
 249         mutex_unlock(&data->update_lock);
 250
 251         return ret;
 252 }
 253
 254 static ssize_t show_temp_input(struct device *dev,
 255                                struct device_attribute *devattr, char *buf)
 256 {
 257         int index = to_sensor_dev_attr(devattr)->index;
 258         struct max6697_data *data = max6697_update_device(dev);
 259         int temp;
 260
 261         if (IS_ERR(data))
 262                 return PTR_ERR(data);
 263
 264         temp = (data->temp[index][MAX6697_TEMP_INPUT] - data->temp_offset) << 3;
 265         temp |= data->temp[index][MAX6697_TEMP_EXT] >> 5;
 266
 267         return sprintf(buf, "%d\n", temp * 125);
 268 }
 269
 270 static ssize_t show_temp(struct device *dev,
 271                          struct device_attribute *devattr, char *buf)
 272 {
 273         int nr = to_sensor_dev_attr_2(devattr)->nr;
 274         int index = to_sensor_dev_attr_2(devattr)->index;
 275         struct max6697_data *data = max6697_update_device(dev);
 276         int temp;
 277
 278         if (IS_ERR(data))
 279                 return PTR_ERR(data);
 280
 281         temp = data->temp[nr][index];
 282         temp -= data->temp_offset;
 283
 284         return sprintf(buf, "%d\n", temp * 1000);
 285 }
 286
 287 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 288                           char *buf)
 289 {
 290         int index = to_sensor_dev_attr(attr)->index;
 291         struct max6697_data *data = max6697_update_device(dev);
 292
 293         if (IS_ERR(data))
 294                 return PTR_ERR(data);
 295
 296         if (data->chip->alarm_map)
 297                 index = data->chip->alarm_map[index];
 298
 299         return sprintf(buf, "%u\n", (data->alarms >> index) & 0x1);
 300 }
 301
 302 static ssize_t set_temp(struct device *dev,
 303                         struct device_attribute *devattr,
 304                         const char *buf, size_t count)
 305 {
 306         int nr = to_sensor_dev_attr_2(devattr)->nr;
 307         int index = to_sensor_dev_attr_2(devattr)->index;
 308         struct max6697_data *data = dev_get_drvdata(dev);
 309         long temp;
 310         int ret;
 311
 312         ret = kstrtol(buf, 10, &temp);
 313         if (ret < 0)
 314                 return ret;
 315
 316         mutex_lock(&data->update_lock);
 317         temp = DIV_ROUND_CLOSEST(temp, 1000) + data->temp_offset;
 318         temp = clamp_val(temp, 0, data->type == max6581 ? 255 : 127);
 319         data->temp[nr][index] = temp;
 320         ret = i2c_smbus_write_byte_data(data->client,
 321                                         index == 2 ? MAX6697_REG_MAX[nr]
 322                                                    : MAX6697_REG_CRIT[nr],
 323                                         temp);
 324         mutex_unlock(&data->update_lock);
 325
 326         return ret < 0 ? ret : count;
 327 }
 328
 329 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL, 0);
 330 static SENSOR_DEVICE_ATTR_2(temp1_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 331                             0, MAX6697_TEMP_MAX);
 332 static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 333                             0, MAX6697_TEMP_CRIT);
 334
 335 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input, NULL, 1);
 336 static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 337                             1, MAX6697_TEMP_MAX);
 338 static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 339                             1, MAX6697_TEMP_CRIT);
 340
 341 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp_input, NULL, 2);
 342 static SENSOR_DEVICE_ATTR_2(temp3_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 343                             2, MAX6697_TEMP_MAX);
 344 static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 345                             2, MAX6697_TEMP_CRIT);
 346
 347 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp_input, NULL, 3);
 348 static SENSOR_DEVICE_ATTR_2(temp4_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 349                             3, MAX6697_TEMP_MAX);
 350 static SENSOR_DEVICE_ATTR_2(temp4_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 351                             3, MAX6697_TEMP_CRIT);
 352
 353 static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp_input, NULL, 4);
 354 static SENSOR_DEVICE_ATTR_2(temp5_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 355                             4, MAX6697_TEMP_MAX);
 356 static SENSOR_DEVICE_ATTR_2(temp5_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 357                             4, MAX6697_TEMP_CRIT);
 358
 359 static SENSOR_DEVICE_ATTR(temp6_input, S_IRUGO, show_temp_input, NULL, 5);
 360 static SENSOR_DEVICE_ATTR_2(temp6_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 361                             5, MAX6697_TEMP_MAX);
 362 static SENSOR_DEVICE_ATTR_2(temp6_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 363                             5, MAX6697_TEMP_CRIT);
 364
 365 static SENSOR_DEVICE_ATTR(temp7_input, S_IRUGO, show_temp_input, NULL, 6);
 366 static SENSOR_DEVICE_ATTR_2(temp7_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 367                             6, MAX6697_TEMP_MAX);
 368 static SENSOR_DEVICE_ATTR_2(temp7_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 369                             6, MAX6697_TEMP_CRIT);
 370
 371 static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, show_temp_input, NULL, 7);
 372 static SENSOR_DEVICE_ATTR_2(temp8_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 373                             7, MAX6697_TEMP_MAX);
 374 static SENSOR_DEVICE_ATTR_2(temp8_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 375                             7, MAX6697_TEMP_CRIT);
 376
 377 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 22);
 378 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 16);
 379 static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 17);
 380 static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 18);
 381 static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO, show_alarm, NULL, 19);
 382 static SENSOR_DEVICE_ATTR(temp6_max_alarm, S_IRUGO, show_alarm, NULL, 20);
 383 static SENSOR_DEVICE_ATTR(temp7_max_alarm, S_IRUGO, show_alarm, NULL, 21);
 384 static SENSOR_DEVICE_ATTR(temp8_max_alarm, S_IRUGO, show_alarm, NULL, 23);
 385
 386 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 14);
 387 static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 8);
 388 static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 9);
 389 static SENSOR_DEVICE_ATTR(temp4_crit_alarm, S_IRUGO, show_alarm, NULL, 10);
 390 static SENSOR_DEVICE_ATTR(temp5_crit_alarm, S_IRUGO, show_alarm, NULL, 11);
 391 static SENSOR_DEVICE_ATTR(temp6_crit_alarm, S_IRUGO, show_alarm, NULL, 12);
 392 static SENSOR_DEVICE_ATTR(temp7_crit_alarm, S_IRUGO, show_alarm, NULL, 13);
 393 static SENSOR_DEVICE_ATTR(temp8_crit_alarm, S_IRUGO, show_alarm, NULL, 15);
 394
 395 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 1);
 396 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2);
 397 static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_alarm, NULL, 3);
 398 static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_alarm, NULL, 4);
 399 static SENSOR_DEVICE_ATTR(temp6_fault, S_IRUGO, show_alarm, NULL, 5);
 400 static SENSOR_DEVICE_ATTR(temp7_fault, S_IRUGO, show_alarm, NULL, 6);
 401 static SENSOR_DEVICE_ATTR(temp8_fault, S_IRUGO, show_alarm, NULL, 7);
 402
 403 static DEVICE_ATTR(dummy, 0, NULL, NULL);
 404
 405 static umode_t max6697_is_visible(struct kobject *kobj, struct attribute *attr,
 406                                   int index)
 407 {
 408         struct device *dev = container_of(kobj, struct device, kobj);
 409         struct max6697_data *data = dev_get_drvdata(dev);
 410         const struct max6697_chip_data *chip = data->chip;
 411         int channel = index / 6;        /* channel number */
 412         int nr = index % 6;             /* attribute index within channel */
 413
 414         if (channel >= chip->channels)
 415                 return 0;
 416
 417         if ((nr == 3 || nr == 4) && !(chip->have_crit & (1 << channel)))
 418                 return 0;
 419         if (nr == 5 && !(chip->have_fault & (1 << channel)))
 420                 return 0;
 421
 422         return attr->mode;
 423 }
 424
 425 /*
 426  * max6697_is_visible uses the index into the following array to determine
 427  * if attributes should be created or not. Any change in order or content
 428  * must be matched in max6697_is_visible.
 429  */
 430 static struct attribute *max6697_attributes[] = {
 431         &sensor_dev_attr_temp1_input.dev_attr.attr,
 432         &sensor_dev_attr_temp1_max.dev_attr.attr,
 433         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 434         &sensor_dev_attr_temp1_crit.dev_attr.attr,
 435         &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 436         &dev_attr_dummy.attr,
 437
 438         &sensor_dev_attr_temp2_input.dev_attr.attr,
 439         &sensor_dev_attr_temp2_max.dev_attr.attr,
 440         &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 441         &sensor_dev_attr_temp2_crit.dev_attr.attr,
 442         &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
 443         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 444
 445         &sensor_dev_attr_temp3_input.dev_attr.attr,
 446         &sensor_dev_attr_temp3_max.dev_attr.attr,
 447         &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
 448         &sensor_dev_attr_temp3_crit.dev_attr.attr,
 449         &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
 450         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 451
 452         &sensor_dev_attr_temp4_input.dev_attr.attr,
 453         &sensor_dev_attr_temp4_max.dev_attr.attr,
 454         &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
 455         &sensor_dev_attr_temp4_crit.dev_attr.attr,
 456         &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
 457         &sensor_dev_attr_temp4_fault.dev_attr.attr,
 458
 459         &sensor_dev_attr_temp5_input.dev_attr.attr,
 460         &sensor_dev_attr_temp5_max.dev_attr.attr,
 461         &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
 462         &sensor_dev_attr_temp5_crit.dev_attr.attr,
 463         &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
 464         &sensor_dev_attr_temp5_fault.dev_attr.attr,
 465
 466         &sensor_dev_attr_temp6_input.dev_attr.attr,
 467         &sensor_dev_attr_temp6_max.dev_attr.attr,
 468         &sensor_dev_attr_temp6_max_alarm.dev_attr.attr,
 469         &sensor_dev_attr_temp6_crit.dev_attr.attr,
 470         &sensor_dev_attr_temp6_crit_alarm.dev_attr.attr,
 471         &sensor_dev_attr_temp6_fault.dev_attr.attr,
 472
 473         &sensor_dev_attr_temp7_input.dev_attr.attr,
 474         &sensor_dev_attr_temp7_max.dev_attr.attr,
 475         &sensor_dev_attr_temp7_max_alarm.dev_attr.attr,
 476         &sensor_dev_attr_temp7_crit.dev_attr.attr,
 477         &sensor_dev_attr_temp7_crit_alarm.dev_attr.attr,
 478         &sensor_dev_attr_temp7_fault.dev_attr.attr,
 479
 480         &sensor_dev_attr_temp8_input.dev_attr.attr,
 481         &sensor_dev_attr_temp8_max.dev_attr.attr,
 482         &sensor_dev_attr_temp8_max_alarm.dev_attr.attr,
 483         &sensor_dev_attr_temp8_crit.dev_attr.attr,
 484         &sensor_dev_attr_temp8_crit_alarm.dev_attr.attr,
 485         &sensor_dev_attr_temp8_fault.dev_attr.attr,
 486         NULL
 487 };
 488
 489 static const struct attribute_group max6697_group = {
 490         .attrs = max6697_attributes, .is_visible = max6697_is_visible,
 491 };
 492 __ATTRIBUTE_GROUPS(max6697);
 493
 494 static void max6697_get_config_of(struct device_node *node,
 495                                   struct max6697_platform_data *pdata)
 496 {
 497         int len;
 498         const __be32 *prop;
 499
 500         pdata->smbus_timeout_disable =
 501                 of_property_read_bool(node, "smbus-timeout-disable");
 502         pdata->extended_range_enable =
 503                 of_property_read_bool(node, "extended-range-enable");
 504         pdata->beta_compensation =
 505                 of_property_read_bool(node, "beta-compensation-enable");
 506
 507         prop = of_get_property(node, "alert-mask", &len);
 508         if (prop && len == sizeof(u32))
 509                 pdata->alert_mask = be32_to_cpu(prop[0]);
 510         prop = of_get_property(node, "over-temperature-mask", &len);
 511         if (prop && len == sizeof(u32))
 512                 pdata->over_temperature_mask = be32_to_cpu(prop[0]);
 513         prop = of_get_property(node, "resistance-cancellation", &len);
 514         if (prop) {
 515                 if (len == sizeof(u32))
 516                         pdata->resistance_cancellation = be32_to_cpu(prop[0]);
 517                 else
 518                         pdata->resistance_cancellation = 0xfe;
 519         }
 520         prop = of_get_property(node, "transistor-ideality", &len);
 521         if (prop && len == 2 * sizeof(u32)) {
 522                         pdata->ideality_mask = be32_to_cpu(prop[0]);
 523                         pdata->ideality_value = be32_to_cpu(prop[1]);
 524         }
 525 }
 526
 527 static int max6697_init_chip(struct max6697_data *data,
 528                              struct i2c_client *client)
 529 {
 530         struct max6697_platform_data *pdata = dev_get_platdata(&client->dev);
 531         struct max6697_platform_data p;
 532         const struct max6697_chip_data *chip = data->chip;
 533         int factor = chip->channels;
 534         int ret, reg;
 535
 536         /*
 537          * Don't touch configuration if neither platform data nor OF
 538          * configuration was specified. If that is the case, use the
 539          * current chip configuration.
 540          */
 541         if (!pdata && !client->dev.of_node) {
 542                 reg = i2c_smbus_read_byte_data(client, MAX6697_REG_CONFIG);
 543                 if (reg < 0)
 544                         return reg;
 545                 if (data->type == max6581) {
 546                         if (reg & MAX6581_CONF_EXTENDED)
 547                                 data->temp_offset = 64;
 548                         reg = i2c_smbus_read_byte_data(client,
 549                                                        MAX6581_REG_RESISTANCE);
 550                         if (reg < 0)
 551                                 return reg;
 552                         factor += hweight8(reg);
 553                 } else {
 554                         if (reg & MAX6697_CONF_RESISTANCE)
 555                                 factor++;
 556                 }
 557                 goto done;
 558         }
 559
 560         if (client->dev.of_node) {
 561                 memset(&p, 0, sizeof(p));
 562                 max6697_get_config_of(client->dev.of_node, &p);
 563                 pdata = &p;
 564         }
 565
 566         reg = 0;
 567         if (pdata->smbus_timeout_disable &&
 568             (chip->valid_conf & MAX6697_CONF_TIMEOUT)) {
 569                 reg |= MAX6697_CONF_TIMEOUT;
 570         }
 571         if (pdata->extended_range_enable &&
 572             (chip->valid_conf & MAX6581_CONF_EXTENDED)) {
 573                 reg |= MAX6581_CONF_EXTENDED;
 574                 data->temp_offset = 64;
 575         }
 576         if (pdata->resistance_cancellation &&
 577             (chip->valid_conf & MAX6697_CONF_RESISTANCE)) {
 578                 reg |= MAX6697_CONF_RESISTANCE;
 579                 factor++;
 580         }
 581         if (pdata->beta_compensation &&
 582             (chip->valid_conf & MAX6693_CONF_BETA)) {
 583                 reg |= MAX6693_CONF_BETA;
 584         }
 585
 586         ret = i2c_smbus_write_byte_data(client, MAX6697_REG_CONFIG, reg);
 587         if (ret < 0)
 588                 return ret;
 589
 590         ret = i2c_smbus_write_byte_data(client, MAX6697_REG_ALERT_MASK,
 591                                 MAX6697_ALERT_MAP_BITS(pdata->alert_mask));
 592         if (ret < 0)
 593                 return ret;
 594
 595         ret = i2c_smbus_write_byte_data(client, MAX6697_REG_OVERT_MASK,
 596                         MAX6697_OVERT_MAP_BITS(pdata->over_temperature_mask));
 597         if (ret < 0)
 598                 return ret;
 599
 600         if (data->type == max6581) {
 601                 factor += hweight8(pdata->resistance_cancellation >> 1);
 602                 ret = i2c_smbus_write_byte_data(client, MAX6581_REG_RESISTANCE,
 603                                         pdata->resistance_cancellation >> 1);
 604                 if (ret < 0)
 605                         return ret;
 606                 ret = i2c_smbus_write_byte_data(client, MAX6581_REG_IDEALITY,
 607                                                 pdata->ideality_value);
 608                 if (ret < 0)
 609                         return ret;
 610                 ret = i2c_smbus_write_byte_data(client,
 611                                                 MAX6581_REG_IDEALITY_SELECT,
 612                                                 pdata->ideality_mask >> 1);
 613                 if (ret < 0)
 614                         return ret;
 615         }
 616 done:
 617         data->update_interval = factor * MAX6697_CONV_TIME;
 618         return 0;
 619 }
 620
 621 static int max6697_probe(struct i2c_client *client,
 622                          const struct i2c_device_id *id)
 623 {
 624         struct i2c_adapter *adapter = client->adapter;
 625         struct device *dev = &client->dev;
 626         struct max6697_data *data;
 627         struct device *hwmon_dev;
 628         int err;
 629
 630         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 631                 return -ENODEV;
 632
 633         data = devm_kzalloc(dev, sizeof(struct max6697_data), GFP_KERNEL);
 634         if (!data)
 635                 return -ENOMEM;
 636
 637         if (client->dev.of_node)
 638                 data->type = (enum chips)of_device_get_match_data(&client->dev);
 639         else
 640                 data->type = id->driver_data;
 641         data->chip = &max6697_chip_data[data->type];
 642         data->client = client;
 643         mutex_init(&data->update_lock);
 644
 645         err = max6697_init_chip(data, client);
 646         if (err)
 647                 return err;
 648
 649         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 650                                                            data,
 651                                                            max6697_groups);
 652         return PTR_ERR_OR_ZERO(hwmon_dev);
 653 }
 654
 655 static const struct i2c_device_id max6697_id[] = {
 656         { "max6581", max6581 },
 657         { "max6602", max6602 },
 658         { "max6622", max6622 },
 659         { "max6636", max6636 },
 660         { "max6689", max6689 },
 661         { "max6693", max6693 },
 662         { "max6694", max6694 },
 663         { "max6697", max6697 },
 664         { "max6698", max6698 },
 665         { "max6699", max6699 },
 666         { }
 667 };
 668 MODULE_DEVICE_TABLE(i2c, max6697_id);
 669
 670 static const struct of_device_id max6697_of_match[] = {
 671         {
 672                 .compatible = "maxim,max6581",
 673                 .data = (void *)max6581
 674         },
 675         {
 676                 .compatible = "maxim,max6602",
 677                 .data = (void *)max6602
 678         },
 679         {
 680                 .compatible = "maxim,max6622",
 681                 .data = (void *)max6622
 682         },
 683         {
 684                 .compatible = "maxim,max6636",
 685                 .data = (void *)max6636
 686         },
 687         {
 688                 .compatible = "maxim,max6689",
 689                 .data = (void *)max6689
 690         },
 691         {
 692                 .compatible = "maxim,max6693",
 693                 .data = (void *)max6693
 694         },
 695         {
 696                 .compatible = "maxim,max6694",
 697                 .data = (void *)max6694
 698         },
 699         {
 700                 .compatible = "maxim,max6697",
 701                 .data = (void *)max6697
 702         },
 703         {
 704                 .compatible = "maxim,max6698",
 705                 .data = (void *)max6698
 706         },
 707         {
 708                 .compatible = "maxim,max6699",
 709                 .data = (void *)max6699
 710         },
 711         { },
 712 };
 713 MODULE_DEVICE_TABLE(of, max6697_of_match);
 714
 715 static struct i2c_driver max6697_driver = {
 716         .class = I2C_CLASS_HWMON,
 717         .driver = {
 718                 .name   = "max6697",
 719                 .of_match_table = of_match_ptr(max6697_of_match),
 720         },
 721         .probe = max6697_probe,
 722         .id_table = max6697_id,
 723 };
 724
 725 module_i2c_driver(max6697_driver);
 726
 727 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
 728 MODULE_DESCRIPTION("MAX6697 temperature sensor driver");
 729 MODULE_LICENSE("GPL");