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_MAP_BITS(reg)   ((((reg) & 0x7e) >> 1) | \
  51                                  (((reg) & 0x01) << 6) | ((reg) & 0x80))
  52
  53 #define MAX6697_REG_STAT(n)             (0x44 + (n))
  54
  55 #define MAX6697_REG_CONFIG              0x41
  56 #define MAX6581_CONF_EXTENDED           (1 << 1)
  57 #define MAX6693_CONF_BETA               (1 << 2)
  58 #define MAX6697_CONF_RESISTANCE         (1 << 3)
  59 #define MAX6697_CONF_TIMEOUT            (1 << 5)
  60 #define MAX6697_REG_ALERT_MASK          0x42
  61 #define MAX6697_REG_OVERT_MASK          0x43
  62
  63 #define MAX6581_REG_RESISTANCE          0x4a
  64 #define MAX6581_REG_IDEALITY            0x4b
  65 #define MAX6581_REG_IDEALITY_SELECT     0x4c
  66 #define MAX6581_REG_OFFSET              0x4d
  67 #define MAX6581_REG_OFFSET_SELECT       0x4e
  68
  69 #define MAX6697_CONV_TIME               156     /* ms per channel, worst case */
  70
  71 struct max6697_chip_data {
  72         int channels;
  73         u32 have_ext;
  74         u32 have_crit;
  75         u32 have_fault;
  76         u8 valid_conf;
  77         const u8 *alarm_map;
  78 };
  79
  80 struct max6697_data {
  81         struct i2c_client *client;
  82
  83         enum chips type;
  84         const struct max6697_chip_data *chip;
  85
  86         int update_interval;    /* in milli-seconds */
  87         int temp_offset;        /* in degrees C */
  88
  89         struct mutex update_lock;
  90         unsigned long last_updated;     /* In jiffies */
  91         bool valid;             /* true if following fields are valid */
  92
  93         /* 1x local and up to 7x remote */
  94         u8 temp[8][4];          /* [nr][0]=temp [1]=ext [2]=max [3]=crit */
  95 #define MAX6697_TEMP_INPUT      0
  96 #define MAX6697_TEMP_EXT        1
  97 #define MAX6697_TEMP_MAX        2
  98 #define MAX6697_TEMP_CRIT       3
  99         u32 alarms;
 100 };
 101
 102 /* Diode fault status bits on MAX6581 are right shifted by one bit */
 103 static const u8 max6581_alarm_map[] = {
 104          0, 0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15,
 105          16, 17, 18, 19, 20, 21, 22, 23 };
 106
 107 static const struct max6697_chip_data max6697_chip_data[] = {
 108         [max6581] = {
 109                 .channels = 8,
 110                 .have_crit = 0xff,
 111                 .have_ext = 0x7f,
 112                 .have_fault = 0xfe,
 113                 .valid_conf = MAX6581_CONF_EXTENDED | MAX6697_CONF_TIMEOUT,
 114                 .alarm_map = max6581_alarm_map,
 115         },
 116         [max6602] = {
 117                 .channels = 5,
 118                 .have_crit = 0x12,
 119                 .have_ext = 0x02,
 120                 .have_fault = 0x1e,
 121                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 122         },
 123         [max6622] = {
 124                 .channels = 5,
 125                 .have_crit = 0x12,
 126                 .have_ext = 0x02,
 127                 .have_fault = 0x1e,
 128                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 129         },
 130         [max6636] = {
 131                 .channels = 7,
 132                 .have_crit = 0x72,
 133                 .have_ext = 0x02,
 134                 .have_fault = 0x7e,
 135                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 136         },
 137         [max6689] = {
 138                 .channels = 7,
 139                 .have_crit = 0x72,
 140                 .have_ext = 0x02,
 141                 .have_fault = 0x7e,
 142                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 143         },
 144         [max6693] = {
 145                 .channels = 7,
 146                 .have_crit = 0x72,
 147                 .have_ext = 0x02,
 148                 .have_fault = 0x7e,
 149                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
 150                   MAX6697_CONF_TIMEOUT,
 151         },
 152         [max6694] = {
 153                 .channels = 5,
 154                 .have_crit = 0x12,
 155                 .have_ext = 0x02,
 156                 .have_fault = 0x1e,
 157                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
 158                   MAX6697_CONF_TIMEOUT,
 159         },
 160         [max6697] = {
 161                 .channels = 7,
 162                 .have_crit = 0x72,
 163                 .have_ext = 0x02,
 164                 .have_fault = 0x7e,
 165                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 166         },
 167         [max6698] = {
 168                 .channels = 7,
 169                 .have_crit = 0x72,
 170                 .have_ext = 0x02,
 171                 .have_fault = 0x0e,
 172                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 173         },
 174         [max6699] = {
 175                 .channels = 5,
 176                 .have_crit = 0x12,
 177                 .have_ext = 0x02,
 178                 .have_fault = 0x1e,
 179                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 180         },
 181 };
 182
 183 static struct max6697_data *max6697_update_device(struct device *dev)
 184 {
 185         struct max6697_data *data = dev_get_drvdata(dev);
 186         struct i2c_client *client = data->client;
 187         struct max6697_data *ret = data;
 188         int val;
 189         int i;
 190         u32 alarms;
 191
 192         mutex_lock(&data->update_lock);
 193
 194         if (data->valid &&
 195             !time_after(jiffies, data->last_updated
 196                         + msecs_to_jiffies(data->update_interval)))
 197                 goto abort;
 198
 199         for (i = 0; i < data->chip->channels; i++) {
 200                 if (data->chip->have_ext & (1 << i)) {
 201                         val = i2c_smbus_read_byte_data(client,
 202                                                        MAX6697_REG_TEMP_EXT[i]);
 203                         if (unlikely(val < 0)) {
 204                                 ret = ERR_PTR(val);
 205                                 goto abort;
 206                         }
 207                         data->temp[i][MAX6697_TEMP_EXT] = val;
 208                 }
 209
 210                 val = i2c_smbus_read_byte_data(client, MAX6697_REG_TEMP[i]);
 211                 if (unlikely(val < 0)) {
 212                         ret = ERR_PTR(val);
 213                         goto abort;
 214                 }
 215                 data->temp[i][MAX6697_TEMP_INPUT] = val;
 216
 217                 val = i2c_smbus_read_byte_data(client, MAX6697_REG_MAX[i]);
 218                 if (unlikely(val < 0)) {
 219                         ret = ERR_PTR(val);
 220                         goto abort;
 221                 }
 222                 data->temp[i][MAX6697_TEMP_MAX] = val;
 223
 224                 if (data->chip->have_crit & (1 << i)) {
 225                         val = i2c_smbus_read_byte_data(client,
 226                                                        MAX6697_REG_CRIT[i]);
 227                         if (unlikely(val < 0)) {
 228                                 ret = ERR_PTR(val);
 229                                 goto abort;
 230                         }
 231                         data->temp[i][MAX6697_TEMP_CRIT] = val;
 232                 }
 233         }
 234
 235         alarms = 0;
 236         for (i = 0; i < 3; i++) {
 237                 val = i2c_smbus_read_byte_data(client, MAX6697_REG_STAT(i));
 238                 if (unlikely(val < 0)) {
 239                         ret = ERR_PTR(val);
 240                         goto abort;
 241                 }
 242                 alarms = (alarms << 8) | val;
 243         }
 244         data->alarms = alarms;
 245         data->last_updated = jiffies;
 246         data->valid = true;
 247 abort:
 248         mutex_unlock(&data->update_lock);
 249
 250         return ret;
 251 }
 252
 253 static ssize_t show_temp_input(struct device *dev,
 254                                struct device_attribute *devattr, char *buf)
 255 {
 256         int index = to_sensor_dev_attr(devattr)->index;
 257         struct max6697_data *data = max6697_update_device(dev);
 258         int temp;
 259
 260         if (IS_ERR(data))
 261                 return PTR_ERR(data);
 262
 263         temp = (data->temp[index][MAX6697_TEMP_INPUT] - data->temp_offset) << 3;
 264         temp |= data->temp[index][MAX6697_TEMP_EXT] >> 5;
 265
 266         return sprintf(buf, "%d\n", temp * 125);
 267 }
 268
 269 static ssize_t show_temp(struct device *dev,
 270                          struct device_attribute *devattr, char *buf)
 271 {
 272         int nr = to_sensor_dev_attr_2(devattr)->nr;
 273         int index = to_sensor_dev_attr_2(devattr)->index;
 274         struct max6697_data *data = max6697_update_device(dev);
 275         int temp;
 276
 277         if (IS_ERR(data))
 278                 return PTR_ERR(data);
 279
 280         temp = data->temp[nr][index];
 281         temp -= data->temp_offset;
 282
 283         return sprintf(buf, "%d\n", temp * 1000);
 284 }
 285
 286 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 287                           char *buf)
 288 {
 289         int index = to_sensor_dev_attr(attr)->index;
 290         struct max6697_data *data = max6697_update_device(dev);
 291
 292         if (IS_ERR(data))
 293                 return PTR_ERR(data);
 294
 295         if (data->chip->alarm_map)
 296                 index = data->chip->alarm_map[index];
 297
 298         return sprintf(buf, "%u\n", (data->alarms >> index) & 0x1);
 299 }
 300
 301 static ssize_t set_temp(struct device *dev,
 302                         struct device_attribute *devattr,
 303                         const char *buf, size_t count)
 304 {
 305         int nr = to_sensor_dev_attr_2(devattr)->nr;
 306         int index = to_sensor_dev_attr_2(devattr)->index;
 307         struct max6697_data *data = dev_get_drvdata(dev);
 308         long temp;
 309         int ret;
 310
 311         ret = kstrtol(buf, 10, &temp);
 312         if (ret < 0)
 313                 return ret;
 314
 315         mutex_lock(&data->update_lock);
 316         temp = DIV_ROUND_CLOSEST(temp, 1000) + data->temp_offset;
 317         temp = clamp_val(temp, 0, data->type == max6581 ? 255 : 127);
 318         data->temp[nr][index] = temp;
 319         ret = i2c_smbus_write_byte_data(data->client,
 320                                         index == 2 ? MAX6697_REG_MAX[nr]
 321                                                    : MAX6697_REG_CRIT[nr],
 322                                         temp);
 323         mutex_unlock(&data->update_lock);
 324
 325         return ret < 0 ? ret : count;
 326 }
 327
 328 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL, 0);
 329 static SENSOR_DEVICE_ATTR_2(temp1_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 330                             0, MAX6697_TEMP_MAX);
 331 static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 332                             0, MAX6697_TEMP_CRIT);
 333
 334 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input, NULL, 1);
 335 static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 336                             1, MAX6697_TEMP_MAX);
 337 static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 338                             1, MAX6697_TEMP_CRIT);
 339
 340 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp_input, NULL, 2);
 341 static SENSOR_DEVICE_ATTR_2(temp3_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 342                             2, MAX6697_TEMP_MAX);
 343 static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 344                             2, MAX6697_TEMP_CRIT);
 345
 346 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp_input, NULL, 3);
 347 static SENSOR_DEVICE_ATTR_2(temp4_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 348                             3, MAX6697_TEMP_MAX);
 349 static SENSOR_DEVICE_ATTR_2(temp4_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 350                             3, MAX6697_TEMP_CRIT);
 351
 352 static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp_input, NULL, 4);
 353 static SENSOR_DEVICE_ATTR_2(temp5_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 354                             4, MAX6697_TEMP_MAX);
 355 static SENSOR_DEVICE_ATTR_2(temp5_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 356                             4, MAX6697_TEMP_CRIT);
 357
 358 static SENSOR_DEVICE_ATTR(temp6_input, S_IRUGO, show_temp_input, NULL, 5);
 359 static SENSOR_DEVICE_ATTR_2(temp6_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 360                             5, MAX6697_TEMP_MAX);
 361 static SENSOR_DEVICE_ATTR_2(temp6_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 362                             5, MAX6697_TEMP_CRIT);
 363
 364 static SENSOR_DEVICE_ATTR(temp7_input, S_IRUGO, show_temp_input, NULL, 6);
 365 static SENSOR_DEVICE_ATTR_2(temp7_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 366                             6, MAX6697_TEMP_MAX);
 367 static SENSOR_DEVICE_ATTR_2(temp7_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 368                             6, MAX6697_TEMP_CRIT);
 369
 370 static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, show_temp_input, NULL, 7);
 371 static SENSOR_DEVICE_ATTR_2(temp8_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 372                             7, MAX6697_TEMP_MAX);
 373 static SENSOR_DEVICE_ATTR_2(temp8_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 374                             7, MAX6697_TEMP_CRIT);
 375
 376 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 22);
 377 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 16);
 378 static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 17);
 379 static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 18);
 380 static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO, show_alarm, NULL, 19);
 381 static SENSOR_DEVICE_ATTR(temp6_max_alarm, S_IRUGO, show_alarm, NULL, 20);
 382 static SENSOR_DEVICE_ATTR(temp7_max_alarm, S_IRUGO, show_alarm, NULL, 21);
 383 static SENSOR_DEVICE_ATTR(temp8_max_alarm, S_IRUGO, show_alarm, NULL, 23);
 384
 385 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 14);
 386 static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 8);
 387 static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 9);
 388 static SENSOR_DEVICE_ATTR(temp4_crit_alarm, S_IRUGO, show_alarm, NULL, 10);
 389 static SENSOR_DEVICE_ATTR(temp5_crit_alarm, S_IRUGO, show_alarm, NULL, 11);
 390 static SENSOR_DEVICE_ATTR(temp6_crit_alarm, S_IRUGO, show_alarm, NULL, 12);
 391 static SENSOR_DEVICE_ATTR(temp7_crit_alarm, S_IRUGO, show_alarm, NULL, 13);
 392 static SENSOR_DEVICE_ATTR(temp8_crit_alarm, S_IRUGO, show_alarm, NULL, 15);
 393
 394 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 1);
 395 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2);
 396 static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_alarm, NULL, 3);
 397 static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_alarm, NULL, 4);
 398 static SENSOR_DEVICE_ATTR(temp6_fault, S_IRUGO, show_alarm, NULL, 5);
 399 static SENSOR_DEVICE_ATTR(temp7_fault, S_IRUGO, show_alarm, NULL, 6);
 400 static SENSOR_DEVICE_ATTR(temp8_fault, S_IRUGO, show_alarm, NULL, 7);
 401
 402 static DEVICE_ATTR(dummy, 0, NULL, NULL);
 403
 404 static umode_t max6697_is_visible(struct kobject *kobj, struct attribute *attr,
 405                                   int index)
 406 {
 407         struct device *dev = container_of(kobj, struct device, kobj);
 408         struct max6697_data *data = dev_get_drvdata(dev);
 409         const struct max6697_chip_data *chip = data->chip;
 410         int channel = index / 6;        /* channel number */
 411         int nr = index % 6;             /* attribute index within channel */
 412
 413         if (channel >= chip->channels)
 414                 return 0;
 415
 416         if ((nr == 3 || nr == 4) && !(chip->have_crit & (1 << channel)))
 417                 return 0;
 418         if (nr == 5 && !(chip->have_fault & (1 << channel)))
 419                 return 0;
 420
 421         return attr->mode;
 422 }
 423
 424 /*
 425  * max6697_is_visible uses the index into the following array to determine
 426  * if attributes should be created or not. Any change in order or content
 427  * must be matched in max6697_is_visible.
 428  */
 429 static struct attribute *max6697_attributes[] = {
 430         &sensor_dev_attr_temp1_input.dev_attr.attr,
 431         &sensor_dev_attr_temp1_max.dev_attr.attr,
 432         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 433         &sensor_dev_attr_temp1_crit.dev_attr.attr,
 434         &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 435         &dev_attr_dummy.attr,
 436
 437         &sensor_dev_attr_temp2_input.dev_attr.attr,
 438         &sensor_dev_attr_temp2_max.dev_attr.attr,
 439         &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 440         &sensor_dev_attr_temp2_crit.dev_attr.attr,
 441         &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
 442         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 443
 444         &sensor_dev_attr_temp3_input.dev_attr.attr,
 445         &sensor_dev_attr_temp3_max.dev_attr.attr,
 446         &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
 447         &sensor_dev_attr_temp3_crit.dev_attr.attr,
 448         &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
 449         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 450
 451         &sensor_dev_attr_temp4_input.dev_attr.attr,
 452         &sensor_dev_attr_temp4_max.dev_attr.attr,
 453         &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
 454         &sensor_dev_attr_temp4_crit.dev_attr.attr,
 455         &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
 456         &sensor_dev_attr_temp4_fault.dev_attr.attr,
 457
 458         &sensor_dev_attr_temp5_input.dev_attr.attr,
 459         &sensor_dev_attr_temp5_max.dev_attr.attr,
 460         &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
 461         &sensor_dev_attr_temp5_crit.dev_attr.attr,
 462         &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
 463         &sensor_dev_attr_temp5_fault.dev_attr.attr,
 464
 465         &sensor_dev_attr_temp6_input.dev_attr.attr,
 466         &sensor_dev_attr_temp6_max.dev_attr.attr,
 467         &sensor_dev_attr_temp6_max_alarm.dev_attr.attr,
 468         &sensor_dev_attr_temp6_crit.dev_attr.attr,
 469         &sensor_dev_attr_temp6_crit_alarm.dev_attr.attr,
 470         &sensor_dev_attr_temp6_fault.dev_attr.attr,
 471
 472         &sensor_dev_attr_temp7_input.dev_attr.attr,
 473         &sensor_dev_attr_temp7_max.dev_attr.attr,
 474         &sensor_dev_attr_temp7_max_alarm.dev_attr.attr,
 475         &sensor_dev_attr_temp7_crit.dev_attr.attr,
 476         &sensor_dev_attr_temp7_crit_alarm.dev_attr.attr,
 477         &sensor_dev_attr_temp7_fault.dev_attr.attr,
 478
 479         &sensor_dev_attr_temp8_input.dev_attr.attr,
 480         &sensor_dev_attr_temp8_max.dev_attr.attr,
 481         &sensor_dev_attr_temp8_max_alarm.dev_attr.attr,
 482         &sensor_dev_attr_temp8_crit.dev_attr.attr,
 483         &sensor_dev_attr_temp8_crit_alarm.dev_attr.attr,
 484         &sensor_dev_attr_temp8_fault.dev_attr.attr,
 485         NULL
 486 };
 487
 488 static const struct attribute_group max6697_group = {
 489         .attrs = max6697_attributes, .is_visible = max6697_is_visible,
 490 };
 491 __ATTRIBUTE_GROUPS(max6697);
 492
 493 static void max6697_get_config_of(struct device_node *node,
 494                                   struct max6697_platform_data *pdata)
 495 {
 496         int len;
 497         const __be32 *prop;
 498
 499         pdata->smbus_timeout_disable =
 500                 of_property_read_bool(node, "smbus-timeout-disable");
 501         pdata->extended_range_enable =
 502                 of_property_read_bool(node, "extended-range-enable");
 503         pdata->beta_compensation =
 504                 of_property_read_bool(node, "beta-compensation-enable");
 505
 506         prop = of_get_property(node, "alert-mask", &len);
 507         if (prop && len == sizeof(u32))
 508                 pdata->alert_mask = be32_to_cpu(prop[0]);
 509         prop = of_get_property(node, "over-temperature-mask", &len);
 510         if (prop && len == sizeof(u32))
 511                 pdata->over_temperature_mask = be32_to_cpu(prop[0]);
 512         prop = of_get_property(node, "resistance-cancellation", &len);
 513         if (prop) {
 514                 if (len == sizeof(u32))
 515                         pdata->resistance_cancellation = be32_to_cpu(prop[0]);
 516                 else
 517                         pdata->resistance_cancellation = 0xfe;
 518         }
 519         prop = of_get_property(node, "transistor-ideality", &len);
 520         if (prop && len == 2 * sizeof(u32)) {
 521                         pdata->ideality_mask = be32_to_cpu(prop[0]);
 522                         pdata->ideality_value = be32_to_cpu(prop[1]);
 523         }
 524 }
 525
 526 static int max6697_init_chip(struct max6697_data *data,
 527                              struct i2c_client *client)
 528 {
 529         struct max6697_platform_data *pdata = dev_get_platdata(&client->dev);
 530         struct max6697_platform_data p;
 531         const struct max6697_chip_data *chip = data->chip;
 532         int factor = chip->channels;
 533         int ret, reg;
 534
 535         /*
 536          * Don't touch configuration if neither platform data nor OF
 537          * configuration was specified. If that is the case, use the
 538          * current chip configuration.
 539          */
 540         if (!pdata && !client->dev.of_node) {
 541                 reg = i2c_smbus_read_byte_data(client, MAX6697_REG_CONFIG);
 542                 if (reg < 0)
 543                         return reg;
 544                 if (data->type == max6581) {
 545                         if (reg & MAX6581_CONF_EXTENDED)
 546                                 data->temp_offset = 64;
 547                         reg = i2c_smbus_read_byte_data(client,
 548                                                        MAX6581_REG_RESISTANCE);
 549                         if (reg < 0)
 550                                 return reg;
 551                         factor += hweight8(reg);
 552                 } else {
 553                         if (reg & MAX6697_CONF_RESISTANCE)
 554                                 factor++;
 555                 }
 556                 goto done;
 557         }
 558
 559         if (client->dev.of_node) {
 560                 memset(&p, 0, sizeof(p));
 561                 max6697_get_config_of(client->dev.of_node, &p);
 562                 pdata = &p;
 563         }
 564
 565         reg = 0;
 566         if (pdata->smbus_timeout_disable &&
 567             (chip->valid_conf & MAX6697_CONF_TIMEOUT)) {
 568                 reg |= MAX6697_CONF_TIMEOUT;
 569         }
 570         if (pdata->extended_range_enable &&
 571             (chip->valid_conf & MAX6581_CONF_EXTENDED)) {
 572                 reg |= MAX6581_CONF_EXTENDED;
 573                 data->temp_offset = 64;
 574         }
 575         if (pdata->resistance_cancellation &&
 576             (chip->valid_conf & MAX6697_CONF_RESISTANCE)) {
 577                 reg |= MAX6697_CONF_RESISTANCE;
 578                 factor++;
 579         }
 580         if (pdata->beta_compensation &&
 581             (chip->valid_conf & MAX6693_CONF_BETA)) {
 582                 reg |= MAX6693_CONF_BETA;
 583         }
 584
 585         ret = i2c_smbus_write_byte_data(client, MAX6697_REG_CONFIG, reg);
 586         if (ret < 0)
 587                 return ret;
 588
 589         ret = i2c_smbus_write_byte_data(client, MAX6697_REG_ALERT_MASK,
 590                                         MAX6697_MAP_BITS(pdata->alert_mask));
 591         if (ret < 0)
 592                 return ret;
 593
 594         ret = i2c_smbus_write_byte_data(client, MAX6697_REG_OVERT_MASK,
 595                                 MAX6697_MAP_BITS(pdata->over_temperature_mask));
 596         if (ret < 0)
 597                 return ret;
 598
 599         if (data->type == max6581) {
 600                 factor += hweight8(pdata->resistance_cancellation >> 1);
 601                 ret = i2c_smbus_write_byte_data(client, MAX6581_REG_RESISTANCE,
 602                                         pdata->resistance_cancellation >> 1);
 603                 if (ret < 0)
 604                         return ret;
 605                 ret = i2c_smbus_write_byte_data(client, MAX6581_REG_IDEALITY,
 606                                                 pdata->ideality_value);
 607                 if (ret < 0)
 608                         return ret;
 609                 ret = i2c_smbus_write_byte_data(client,
 610                                                 MAX6581_REG_IDEALITY_SELECT,
 611                                                 pdata->ideality_mask >> 1);
 612                 if (ret < 0)
 613                         return ret;
 614         }
 615 done:
 616         data->update_interval = factor * MAX6697_CONV_TIME;
 617         return 0;
 618 }
 619
 620 static int max6697_probe(struct i2c_client *client,
 621                          const struct i2c_device_id *id)
 622 {
 623         struct i2c_adapter *adapter = client->adapter;
 624         struct device *dev = &client->dev;
 625         struct max6697_data *data;
 626         struct device *hwmon_dev;
 627         int err;
 628
 629         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 630                 return -ENODEV;
 631
 632         data = devm_kzalloc(dev, sizeof(struct max6697_data), GFP_KERNEL);
 633         if (!data)
 634                 return -ENOMEM;
 635
 636         if (client->dev.of_node)
 637                 data->type = (enum chips)of_device_get_match_data(&client->dev);
 638         else
 639                 data->type = id->driver_data;
 640         data->chip = &max6697_chip_data[data->type];
 641         data->client = client;
 642         mutex_init(&data->update_lock);
 643
 644         err = max6697_init_chip(data, client);
 645         if (err)
 646                 return err;
 647
 648         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 649                                                            data,
 650                                                            max6697_groups);
 651         return PTR_ERR_OR_ZERO(hwmon_dev);
 652 }
 653
 654 static const struct i2c_device_id max6697_id[] = {
 655         { "max6581", max6581 },
 656         { "max6602", max6602 },
 657         { "max6622", max6622 },
 658         { "max6636", max6636 },
 659         { "max6689", max6689 },
 660         { "max6693", max6693 },
 661         { "max6694", max6694 },
 662         { "max6697", max6697 },
 663         { "max6698", max6698 },
 664         { "max6699", max6699 },
 665         { }
 666 };
 667 MODULE_DEVICE_TABLE(i2c, max6697_id);
 668
 669 static const struct of_device_id max6697_of_match[] = {
 670         {
 671                 .compatible = "maxim,max6581",
 672                 .data = (void *)max6581
 673         },
 674         {
 675                 .compatible = "maxim,max6602",
 676                 .data = (void *)max6602
 677         },
 678         {
 679                 .compatible = "maxim,max6622",
 680                 .data = (void *)max6622
 681         },
 682         {
 683                 .compatible = "maxim,max6636",
 684                 .data = (void *)max6636
 685         },
 686         {
 687                 .compatible = "maxim,max6689",
 688                 .data = (void *)max6689
 689         },
 690         {
 691                 .compatible = "maxim,max6693",
 692                 .data = (void *)max6693
 693         },
 694         {
 695                 .compatible = "maxim,max6694",
 696                 .data = (void *)max6694
 697         },
 698         {
 699                 .compatible = "maxim,max6697",
 700                 .data = (void *)max6697
 701         },
 702         {
 703                 .compatible = "maxim,max6698",
 704                 .data = (void *)max6698
 705         },
 706         {
 707                 .compatible = "maxim,max6699",
 708                 .data = (void *)max6699
 709         },
 710         { },
 711 };
 712 MODULE_DEVICE_TABLE(of, max6697_of_match);
 713
 714 static struct i2c_driver max6697_driver = {
 715         .class = I2C_CLASS_HWMON,
 716         .driver = {
 717                 .name   = "max6697",
 718                 .of_match_table = of_match_ptr(max6697_of_match),
 719         },
 720         .probe = max6697_probe,
 721         .id_table = max6697_id,
 722 };
 723
 724 module_i2c_driver(max6697_driver);
 725
 726 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
 727 MODULE_DESCRIPTION("MAX6697 temperature sensor driver");
 728 MODULE_LICENSE("GPL");