drivers/hwmon/max6697.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (c) 2012 Guenter Roeck <linux@roeck-us.net>
   4  *
   5  * based on max1668.c
   6  * Copyright (c) 2011 David George <david.george@ska.ac.za>
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/slab.h>
  12 #include <linux/jiffies.h>
  13 #include <linux/i2c.h>
  14 #include <linux/hwmon.h>
  15 #include <linux/hwmon-sysfs.h>
  16 #include <linux/err.h>
  17 #include <linux/mutex.h>
  18 #include <linux/of_device.h>
  19 #include <linux/of.h>
  20
  21 #include <linux/platform_data/max6697.h>
  22
  23 enum chips { max6581, max6602, max6622, max6636, max6689, max6693, max6694,
  24              max6697, max6698, max6699 };
  25
  26 /* Report local sensor as temp1 */
  27
  28 static const u8 MAX6697_REG_TEMP[] = {
  29                         0x07, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x08 };
  30 static const u8 MAX6697_REG_TEMP_EXT[] = {
  31                         0x57, 0x09, 0x52, 0x53, 0x54, 0x55, 0x56, 0 };
  32 static const u8 MAX6697_REG_MAX[] = {
  33                         0x17, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x18 };
  34 static const u8 MAX6697_REG_CRIT[] = {
  35                         0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27 };
  36
  37 /*
  38  * Map device tree / platform data register bit map to chip bit map.
  39  * Applies to alert register and over-temperature register.
  40  */
  41 #define MAX6697_ALERT_MAP_BITS(reg)     ((((reg) & 0x7e) >> 1) | \
  42                                  (((reg) & 0x01) << 6) | ((reg) & 0x80))
  43 #define MAX6697_OVERT_MAP_BITS(reg) (((reg) >> 1) | (((reg) & 0x01) << 7))
  44
  45 #define MAX6697_REG_STAT(n)             (0x44 + (n))
  46
  47 #define MAX6697_REG_CONFIG              0x41
  48 #define MAX6581_CONF_EXTENDED           (1 << 1)
  49 #define MAX6693_CONF_BETA               (1 << 2)
  50 #define MAX6697_CONF_RESISTANCE         (1 << 3)
  51 #define MAX6697_CONF_TIMEOUT            (1 << 5)
  52 #define MAX6697_REG_ALERT_MASK          0x42
  53 #define MAX6697_REG_OVERT_MASK          0x43
  54
  55 #define MAX6581_REG_RESISTANCE          0x4a
  56 #define MAX6581_REG_IDEALITY            0x4b
  57 #define MAX6581_REG_IDEALITY_SELECT     0x4c
  58 #define MAX6581_REG_OFFSET              0x4d
  59 #define MAX6581_REG_OFFSET_SELECT       0x4e
  60 #define MAX6581_OFFSET_MIN              -31750
  61 #define MAX6581_OFFSET_MAX              31750
  62
  63 #define MAX6697_CONV_TIME               156     /* ms per channel, worst case */
  64
  65 struct max6697_chip_data {
  66         int channels;
  67         u32 have_ext;
  68         u32 have_crit;
  69         u32 have_fault;
  70         u8 valid_conf;
  71         const u8 *alarm_map;
  72 };
  73
  74 struct max6697_data {
  75         struct i2c_client *client;
  76
  77         enum chips type;
  78         const struct max6697_chip_data *chip;
  79
  80         int update_interval;    /* in milli-seconds */
  81         int temp_offset;        /* in degrees C */
  82
  83         struct mutex update_lock;
  84         unsigned long last_updated;     /* In jiffies */
  85         bool valid;             /* true if following fields are valid */
  86
  87         /* 1x local and up to 7x remote */
  88         u8 temp[8][4];          /* [nr][0]=temp [1]=ext [2]=max [3]=crit */
  89 #define MAX6697_TEMP_INPUT      0
  90 #define MAX6697_TEMP_EXT        1
  91 #define MAX6697_TEMP_MAX        2
  92 #define MAX6697_TEMP_CRIT       3
  93         u32 alarms;
  94 };
  95
  96 /* Diode fault status bits on MAX6581 are right shifted by one bit */
  97 static const u8 max6581_alarm_map[] = {
  98          0, 0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15,
  99          16, 17, 18, 19, 20, 21, 22, 23 };
 100
 101 static const struct max6697_chip_data max6697_chip_data[] = {
 102         [max6581] = {
 103                 .channels = 8,
 104                 .have_crit = 0xff,
 105                 .have_ext = 0x7f,
 106                 .have_fault = 0xfe,
 107                 .valid_conf = MAX6581_CONF_EXTENDED | MAX6697_CONF_TIMEOUT,
 108                 .alarm_map = max6581_alarm_map,
 109         },
 110         [max6602] = {
 111                 .channels = 5,
 112                 .have_crit = 0x12,
 113                 .have_ext = 0x02,
 114                 .have_fault = 0x1e,
 115                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 116         },
 117         [max6622] = {
 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         [max6636] = {
 125                 .channels = 7,
 126                 .have_crit = 0x72,
 127                 .have_ext = 0x02,
 128                 .have_fault = 0x7e,
 129                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 130         },
 131         [max6689] = {
 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         [max6693] = {
 139                 .channels = 7,
 140                 .have_crit = 0x72,
 141                 .have_ext = 0x02,
 142                 .have_fault = 0x7e,
 143                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
 144                   MAX6697_CONF_TIMEOUT,
 145         },
 146         [max6694] = {
 147                 .channels = 5,
 148                 .have_crit = 0x12,
 149                 .have_ext = 0x02,
 150                 .have_fault = 0x1e,
 151                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
 152                   MAX6697_CONF_TIMEOUT,
 153         },
 154         [max6697] = {
 155                 .channels = 7,
 156                 .have_crit = 0x72,
 157                 .have_ext = 0x02,
 158                 .have_fault = 0x7e,
 159                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 160         },
 161         [max6698] = {
 162                 .channels = 7,
 163                 .have_crit = 0x72,
 164                 .have_ext = 0x02,
 165                 .have_fault = 0x0e,
 166                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 167         },
 168         [max6699] = {
 169                 .channels = 5,
 170                 .have_crit = 0x12,
 171                 .have_ext = 0x02,
 172                 .have_fault = 0x1e,
 173                 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 174         },
 175 };
 176
 177 static inline int max6581_offset_to_millic(int val)
 178 {
 179         return sign_extend32(val, 7) * 250;
 180 }
 181
 182 static struct max6697_data *max6697_update_device(struct device *dev)
 183 {
 184         struct max6697_data *data = dev_get_drvdata(dev);
 185         struct i2c_client *client = data->client;
 186         struct max6697_data *ret = data;
 187         int val;
 188         int i;
 189         u32 alarms;
 190
 191         mutex_lock(&data->update_lock);
 192
 193         if (data->valid &&
 194             !time_after(jiffies, data->last_updated
 195                         + msecs_to_jiffies(data->update_interval)))
 196                 goto abort;
 197
 198         for (i = 0; i < data->chip->channels; i++) {
 199                 if (data->chip->have_ext & (1 << i)) {
 200                         val = i2c_smbus_read_byte_data(client,
 201                                                        MAX6697_REG_TEMP_EXT[i]);
 202                         if (unlikely(val < 0)) {
 203                                 ret = ERR_PTR(val);
 204                                 goto abort;
 205                         }
 206                         data->temp[i][MAX6697_TEMP_EXT] = val;
 207                 }
 208
 209                 val = i2c_smbus_read_byte_data(client, MAX6697_REG_TEMP[i]);
 210                 if (unlikely(val < 0)) {
 211                         ret = ERR_PTR(val);
 212                         goto abort;
 213                 }
 214                 data->temp[i][MAX6697_TEMP_INPUT] = val;
 215
 216                 val = i2c_smbus_read_byte_data(client, MAX6697_REG_MAX[i]);
 217                 if (unlikely(val < 0)) {
 218                         ret = ERR_PTR(val);
 219                         goto abort;
 220                 }
 221                 data->temp[i][MAX6697_TEMP_MAX] = val;
 222
 223                 if (data->chip->have_crit & (1 << i)) {
 224                         val = i2c_smbus_read_byte_data(client,
 225                                                        MAX6697_REG_CRIT[i]);
 226                         if (unlikely(val < 0)) {
 227                                 ret = ERR_PTR(val);
 228                                 goto abort;
 229                         }
 230                         data->temp[i][MAX6697_TEMP_CRIT] = val;
 231                 }
 232         }
 233
 234         alarms = 0;
 235         for (i = 0; i < 3; i++) {
 236                 val = i2c_smbus_read_byte_data(client, MAX6697_REG_STAT(i));
 237                 if (unlikely(val < 0)) {
 238                         ret = ERR_PTR(val);
 239                         goto abort;
 240                 }
 241                 alarms = (alarms << 8) | val;
 242         }
 243         data->alarms = alarms;
 244         data->last_updated = jiffies;
 245         data->valid = true;
 246 abort:
 247         mutex_unlock(&data->update_lock);
 248
 249         return ret;
 250 }
 251
 252 static ssize_t temp_input_show(struct device *dev,
 253                                struct device_attribute *devattr, char *buf)
 254 {
 255         int index = to_sensor_dev_attr(devattr)->index;
 256         struct max6697_data *data = max6697_update_device(dev);
 257         int temp;
 258
 259         if (IS_ERR(data))
 260                 return PTR_ERR(data);
 261
 262         temp = (data->temp[index][MAX6697_TEMP_INPUT] - data->temp_offset) << 3;
 263         temp |= data->temp[index][MAX6697_TEMP_EXT] >> 5;
 264
 265         return sprintf(buf, "%d\n", temp * 125);
 266 }
 267
 268 static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
 269                          char *buf)
 270 {
 271         int nr = to_sensor_dev_attr_2(devattr)->nr;
 272         int index = to_sensor_dev_attr_2(devattr)->index;
 273         struct max6697_data *data = max6697_update_device(dev);
 274         int temp;
 275
 276         if (IS_ERR(data))
 277                 return PTR_ERR(data);
 278
 279         temp = data->temp[nr][index];
 280         temp -= data->temp_offset;
 281
 282         return sprintf(buf, "%d\n", temp * 1000);
 283 }
 284
 285 static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
 286                           char *buf)
 287 {
 288         int index = to_sensor_dev_attr(attr)->index;
 289         struct max6697_data *data = max6697_update_device(dev);
 290
 291         if (IS_ERR(data))
 292                 return PTR_ERR(data);
 293
 294         if (data->chip->alarm_map)
 295                 index = data->chip->alarm_map[index];
 296
 297         return sprintf(buf, "%u\n", (data->alarms >> index) & 0x1);
 298 }
 299
 300 static ssize_t temp_store(struct device *dev,
 301                           struct device_attribute *devattr, const char *buf,
 302                           size_t count)
 303 {
 304         int nr = to_sensor_dev_attr_2(devattr)->nr;
 305         int index = to_sensor_dev_attr_2(devattr)->index;
 306         struct max6697_data *data = dev_get_drvdata(dev);
 307         long temp;
 308         int ret;
 309
 310         ret = kstrtol(buf, 10, &temp);
 311         if (ret < 0)
 312                 return ret;
 313
 314         mutex_lock(&data->update_lock);
 315         temp = DIV_ROUND_CLOSEST(temp, 1000) + data->temp_offset;
 316         temp = clamp_val(temp, 0, data->type == max6581 ? 255 : 127);
 317         data->temp[nr][index] = temp;
 318         ret = i2c_smbus_write_byte_data(data->client,
 319                                         index == 2 ? MAX6697_REG_MAX[nr]
 320                                                    : MAX6697_REG_CRIT[nr],
 321                                         temp);
 322         mutex_unlock(&data->update_lock);
 323
 324         return ret < 0 ? ret : count;
 325 }
 326
 327 static ssize_t offset_store(struct device *dev, struct device_attribute *devattr, const char *buf,
 328                             size_t count)
 329 {
 330         int val, ret, index, select;
 331         struct max6697_data *data;
 332         bool channel_enabled;
 333         long temp;
 334
 335         index = to_sensor_dev_attr(devattr)->index;
 336         data = dev_get_drvdata(dev);
 337         ret = kstrtol(buf, 10, &temp);
 338         if (ret < 0)
 339                 return ret;
 340
 341         mutex_lock(&data->update_lock);
 342         select = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET_SELECT);
 343         if (select < 0) {
 344                 ret = select;
 345                 goto abort;
 346         }
 347         channel_enabled = (select & (1 << (index - 1)));
 348         temp = clamp_val(temp, MAX6581_OFFSET_MIN, MAX6581_OFFSET_MAX);
 349         val = DIV_ROUND_CLOSEST(temp, 250);
 350         /* disable the offset for channel if the new offset is 0 */
 351         if (val == 0) {
 352                 if (channel_enabled)
 353                         ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET_SELECT,
 354                                                         select & ~(1 << (index - 1)));
 355                 ret = ret < 0 ? ret : count;
 356                 goto abort;
 357         }
 358         if (!channel_enabled) {
 359                 ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET_SELECT,
 360                                                 select | (1 << (index - 1)));
 361                 if (ret < 0)
 362                         goto abort;
 363         }
 364         ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET, val);
 365         ret = ret < 0 ? ret : count;
 366
 367 abort:
 368         mutex_unlock(&data->update_lock);
 369         return ret;
 370 }
 371
 372 static ssize_t offset_show(struct device *dev, struct device_attribute *devattr, char *buf)
 373 {
 374         struct max6697_data *data;
 375         int select, ret, index;
 376
 377         index = to_sensor_dev_attr(devattr)->index;
 378         data = dev_get_drvdata(dev);
 379         mutex_lock(&data->update_lock);
 380         select = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET_SELECT);
 381         if (select < 0)
 382                 ret = select;
 383         else if (select & (1 << (index - 1)))
 384                 ret = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET);
 385         else
 386                 ret = 0;
 387         mutex_unlock(&data->update_lock);
 388         return ret < 0 ? ret : sprintf(buf, "%d\n", max6581_offset_to_millic(ret));
 389 }
 390
 391 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
 392 static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0, MAX6697_TEMP_MAX);
 393 static SENSOR_DEVICE_ATTR_2_RW(temp1_crit, temp, 0, MAX6697_TEMP_CRIT);
 394
 395 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
 396 static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 1, MAX6697_TEMP_MAX);
 397 static SENSOR_DEVICE_ATTR_2_RW(temp2_crit, temp, 1, MAX6697_TEMP_CRIT);
 398
 399 static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2);
 400 static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, MAX6697_TEMP_MAX);
 401 static SENSOR_DEVICE_ATTR_2_RW(temp3_crit, temp, 2, MAX6697_TEMP_CRIT);
 402
 403 static SENSOR_DEVICE_ATTR_RO(temp4_input, temp_input, 3);
 404 static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 3, MAX6697_TEMP_MAX);
 405 static SENSOR_DEVICE_ATTR_2_RW(temp4_crit, temp, 3, MAX6697_TEMP_CRIT);
 406
 407 static SENSOR_DEVICE_ATTR_RO(temp5_input, temp_input, 4);
 408 static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 4, MAX6697_TEMP_MAX);
 409 static SENSOR_DEVICE_ATTR_2_RW(temp5_crit, temp, 4, MAX6697_TEMP_CRIT);
 410
 411 static SENSOR_DEVICE_ATTR_RO(temp6_input, temp_input, 5);
 412 static SENSOR_DEVICE_ATTR_2_RW(temp6_max, temp, 5, MAX6697_TEMP_MAX);
 413 static SENSOR_DEVICE_ATTR_2_RW(temp6_crit, temp, 5, MAX6697_TEMP_CRIT);
 414
 415 static SENSOR_DEVICE_ATTR_RO(temp7_input, temp_input, 6);
 416 static SENSOR_DEVICE_ATTR_2_RW(temp7_max, temp, 6, MAX6697_TEMP_MAX);
 417 static SENSOR_DEVICE_ATTR_2_RW(temp7_crit, temp, 6, MAX6697_TEMP_CRIT);
 418
 419 static SENSOR_DEVICE_ATTR_RO(temp8_input, temp_input, 7);
 420 static SENSOR_DEVICE_ATTR_2_RW(temp8_max, temp, 7, MAX6697_TEMP_MAX);
 421 static SENSOR_DEVICE_ATTR_2_RW(temp8_crit, temp, 7, MAX6697_TEMP_CRIT);
 422
 423 static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 22);
 424 static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 16);
 425 static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, alarm, 17);
 426 static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, alarm, 18);
 427 static SENSOR_DEVICE_ATTR_RO(temp5_max_alarm, alarm, 19);
 428 static SENSOR_DEVICE_ATTR_RO(temp6_max_alarm, alarm, 20);
 429 static SENSOR_DEVICE_ATTR_RO(temp7_max_alarm, alarm, 21);
 430 static SENSOR_DEVICE_ATTR_RO(temp8_max_alarm, alarm, 23);
 431
 432 static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 14);
 433 static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 8);
 434 static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, alarm, 9);
 435 static SENSOR_DEVICE_ATTR_RO(temp4_crit_alarm, alarm, 10);
 436 static SENSOR_DEVICE_ATTR_RO(temp5_crit_alarm, alarm, 11);
 437 static SENSOR_DEVICE_ATTR_RO(temp6_crit_alarm, alarm, 12);
 438 static SENSOR_DEVICE_ATTR_RO(temp7_crit_alarm, alarm, 13);
 439 static SENSOR_DEVICE_ATTR_RO(temp8_crit_alarm, alarm, 15);
 440
 441 static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 1);
 442 static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 2);
 443 static SENSOR_DEVICE_ATTR_RO(temp4_fault, alarm, 3);
 444 static SENSOR_DEVICE_ATTR_RO(temp5_fault, alarm, 4);
 445 static SENSOR_DEVICE_ATTR_RO(temp6_fault, alarm, 5);
 446 static SENSOR_DEVICE_ATTR_RO(temp7_fault, alarm, 6);
 447 static SENSOR_DEVICE_ATTR_RO(temp8_fault, alarm, 7);
 448
 449 /* There is no offset for local temperature so starting from temp2 */
 450 static SENSOR_DEVICE_ATTR_RW(temp2_offset, offset, 1);
 451 static SENSOR_DEVICE_ATTR_RW(temp3_offset, offset, 2);
 452 static SENSOR_DEVICE_ATTR_RW(temp4_offset, offset, 3);
 453 static SENSOR_DEVICE_ATTR_RW(temp5_offset, offset, 4);
 454 static SENSOR_DEVICE_ATTR_RW(temp6_offset, offset, 5);
 455 static SENSOR_DEVICE_ATTR_RW(temp7_offset, offset, 6);
 456 static SENSOR_DEVICE_ATTR_RW(temp8_offset, offset, 7);
 457
 458 static DEVICE_ATTR(dummy, 0, NULL, NULL);
 459
 460 static umode_t max6697_is_visible(struct kobject *kobj, struct attribute *attr,
 461                                   int index)
 462 {
 463         struct device *dev = container_of(kobj, struct device, kobj);
 464         struct max6697_data *data = dev_get_drvdata(dev);
 465         const struct max6697_chip_data *chip = data->chip;
 466         int channel = index / 7;        /* channel number */
 467         int nr = index % 7;             /* attribute index within channel */
 468
 469         if (channel >= chip->channels)
 470                 return 0;
 471
 472         if ((nr == 3 || nr == 4) && !(chip->have_crit & (1 << channel)))
 473                 return 0;
 474         if (nr == 5 && !(chip->have_fault & (1 << channel)))
 475                 return 0;
 476         /* offset reg is only supported on max6581 remote channels */
 477         if (nr == 6)
 478                 if (data->type != max6581 || channel == 0)
 479                         return 0;
 480
 481         return attr->mode;
 482 }
 483
 484 /*
 485  * max6697_is_visible uses the index into the following array to determine
 486  * if attributes should be created or not. Any change in order or content
 487  * must be matched in max6697_is_visible.
 488  */
 489 static struct attribute *max6697_attributes[] = {
 490         &sensor_dev_attr_temp1_input.dev_attr.attr,
 491         &sensor_dev_attr_temp1_max.dev_attr.attr,
 492         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 493         &sensor_dev_attr_temp1_crit.dev_attr.attr,
 494         &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 495         &dev_attr_dummy.attr,
 496         &dev_attr_dummy.attr,
 497
 498         &sensor_dev_attr_temp2_input.dev_attr.attr,
 499         &sensor_dev_attr_temp2_max.dev_attr.attr,
 500         &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 501         &sensor_dev_attr_temp2_crit.dev_attr.attr,
 502         &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
 503         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 504         &sensor_dev_attr_temp2_offset.dev_attr.attr,
 505
 506         &sensor_dev_attr_temp3_input.dev_attr.attr,
 507         &sensor_dev_attr_temp3_max.dev_attr.attr,
 508         &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
 509         &sensor_dev_attr_temp3_crit.dev_attr.attr,
 510         &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
 511         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 512         &sensor_dev_attr_temp3_offset.dev_attr.attr,
 513
 514         &sensor_dev_attr_temp4_input.dev_attr.attr,
 515         &sensor_dev_attr_temp4_max.dev_attr.attr,
 516         &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
 517         &sensor_dev_attr_temp4_crit.dev_attr.attr,
 518         &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
 519         &sensor_dev_attr_temp4_fault.dev_attr.attr,
 520         &sensor_dev_attr_temp4_offset.dev_attr.attr,
 521
 522         &sensor_dev_attr_temp5_input.dev_attr.attr,
 523         &sensor_dev_attr_temp5_max.dev_attr.attr,
 524         &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
 525         &sensor_dev_attr_temp5_crit.dev_attr.attr,
 526         &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
 527         &sensor_dev_attr_temp5_fault.dev_attr.attr,
 528         &sensor_dev_attr_temp5_offset.dev_attr.attr,
 529
 530         &sensor_dev_attr_temp6_input.dev_attr.attr,
 531         &sensor_dev_attr_temp6_max.dev_attr.attr,
 532         &sensor_dev_attr_temp6_max_alarm.dev_attr.attr,
 533         &sensor_dev_attr_temp6_crit.dev_attr.attr,
 534         &sensor_dev_attr_temp6_crit_alarm.dev_attr.attr,
 535         &sensor_dev_attr_temp6_fault.dev_attr.attr,
 536         &sensor_dev_attr_temp6_offset.dev_attr.attr,
 537
 538         &sensor_dev_attr_temp7_input.dev_attr.attr,
 539         &sensor_dev_attr_temp7_max.dev_attr.attr,
 540         &sensor_dev_attr_temp7_max_alarm.dev_attr.attr,
 541         &sensor_dev_attr_temp7_crit.dev_attr.attr,
 542         &sensor_dev_attr_temp7_crit_alarm.dev_attr.attr,
 543         &sensor_dev_attr_temp7_fault.dev_attr.attr,
 544         &sensor_dev_attr_temp7_offset.dev_attr.attr,
 545
 546         &sensor_dev_attr_temp8_input.dev_attr.attr,
 547         &sensor_dev_attr_temp8_max.dev_attr.attr,
 548         &sensor_dev_attr_temp8_max_alarm.dev_attr.attr,
 549         &sensor_dev_attr_temp8_crit.dev_attr.attr,
 550         &sensor_dev_attr_temp8_crit_alarm.dev_attr.attr,
 551         &sensor_dev_attr_temp8_fault.dev_attr.attr,
 552         &sensor_dev_attr_temp8_offset.dev_attr.attr,
 553         NULL
 554 };
 555
 556 static const struct attribute_group max6697_group = {
 557         .attrs = max6697_attributes, .is_visible = max6697_is_visible,
 558 };
 559 __ATTRIBUTE_GROUPS(max6697);
 560
 561 static void max6697_get_config_of(struct device_node *node,
 562                                   struct max6697_platform_data *pdata)
 563 {
 564         int len;
 565         const __be32 *prop;
 566
 567         pdata->smbus_timeout_disable =
 568                 of_property_read_bool(node, "smbus-timeout-disable");
 569         pdata->extended_range_enable =
 570                 of_property_read_bool(node, "extended-range-enable");
 571         pdata->beta_compensation =
 572                 of_property_read_bool(node, "beta-compensation-enable");
 573
 574         prop = of_get_property(node, "alert-mask", &len);
 575         if (prop && len == sizeof(u32))
 576                 pdata->alert_mask = be32_to_cpu(prop[0]);
 577         prop = of_get_property(node, "over-temperature-mask", &len);
 578         if (prop && len == sizeof(u32))
 579                 pdata->over_temperature_mask = be32_to_cpu(prop[0]);
 580         prop = of_get_property(node, "resistance-cancellation", &len);
 581         if (prop) {
 582                 if (len == sizeof(u32))
 583                         pdata->resistance_cancellation = be32_to_cpu(prop[0]);
 584                 else
 585                         pdata->resistance_cancellation = 0xfe;
 586         }
 587         prop = of_get_property(node, "transistor-ideality", &len);
 588         if (prop && len == 2 * sizeof(u32)) {
 589                         pdata->ideality_mask = be32_to_cpu(prop[0]);
 590                         pdata->ideality_value = be32_to_cpu(prop[1]);
 591         }
 592 }
 593
 594 static int max6697_init_chip(struct max6697_data *data,
 595                              struct i2c_client *client)
 596 {
 597         struct max6697_platform_data *pdata = dev_get_platdata(&client->dev);
 598         struct max6697_platform_data p;
 599         const struct max6697_chip_data *chip = data->chip;
 600         int factor = chip->channels;
 601         int ret, reg;
 602
 603         /*
 604          * Don't touch configuration if neither platform data nor OF
 605          * configuration was specified. If that is the case, use the
 606          * current chip configuration.
 607          */
 608         if (!pdata && !client->dev.of_node) {
 609                 reg = i2c_smbus_read_byte_data(client, MAX6697_REG_CONFIG);
 610                 if (reg < 0)
 611                         return reg;
 612                 if (data->type == max6581) {
 613                         if (reg & MAX6581_CONF_EXTENDED)
 614                                 data->temp_offset = 64;
 615                         reg = i2c_smbus_read_byte_data(client,
 616                                                        MAX6581_REG_RESISTANCE);
 617                         if (reg < 0)
 618                                 return reg;
 619                         factor += hweight8(reg);
 620                 } else {
 621                         if (reg & MAX6697_CONF_RESISTANCE)
 622                                 factor++;
 623                 }
 624                 goto done;
 625         }
 626
 627         if (client->dev.of_node) {
 628                 memset(&p, 0, sizeof(p));
 629                 max6697_get_config_of(client->dev.of_node, &p);
 630                 pdata = &p;
 631         }
 632
 633         reg = 0;
 634         if (pdata->smbus_timeout_disable &&
 635             (chip->valid_conf & MAX6697_CONF_TIMEOUT)) {
 636                 reg |= MAX6697_CONF_TIMEOUT;
 637         }
 638         if (pdata->extended_range_enable &&
 639             (chip->valid_conf & MAX6581_CONF_EXTENDED)) {
 640                 reg |= MAX6581_CONF_EXTENDED;
 641                 data->temp_offset = 64;
 642         }
 643         if (pdata->resistance_cancellation &&
 644             (chip->valid_conf & MAX6697_CONF_RESISTANCE)) {
 645                 reg |= MAX6697_CONF_RESISTANCE;
 646                 factor++;
 647         }
 648         if (pdata->beta_compensation &&
 649             (chip->valid_conf & MAX6693_CONF_BETA)) {
 650                 reg |= MAX6693_CONF_BETA;
 651         }
 652
 653         ret = i2c_smbus_write_byte_data(client, MAX6697_REG_CONFIG, reg);
 654         if (ret < 0)
 655                 return ret;
 656
 657         ret = i2c_smbus_write_byte_data(client, MAX6697_REG_ALERT_MASK,
 658                                 MAX6697_ALERT_MAP_BITS(pdata->alert_mask));
 659         if (ret < 0)
 660                 return ret;
 661
 662         ret = i2c_smbus_write_byte_data(client, MAX6697_REG_OVERT_MASK,
 663                         MAX6697_OVERT_MAP_BITS(pdata->over_temperature_mask));
 664         if (ret < 0)
 665                 return ret;
 666
 667         if (data->type == max6581) {
 668                 factor += hweight8(pdata->resistance_cancellation >> 1);
 669                 ret = i2c_smbus_write_byte_data(client, MAX6581_REG_RESISTANCE,
 670                                         pdata->resistance_cancellation >> 1);
 671                 if (ret < 0)
 672                         return ret;
 673                 ret = i2c_smbus_write_byte_data(client, MAX6581_REG_IDEALITY,
 674                                                 pdata->ideality_value);
 675                 if (ret < 0)
 676                         return ret;
 677                 ret = i2c_smbus_write_byte_data(client,
 678                                                 MAX6581_REG_IDEALITY_SELECT,
 679                                                 pdata->ideality_mask >> 1);
 680                 if (ret < 0)
 681                         return ret;
 682         }
 683 done:
 684         data->update_interval = factor * MAX6697_CONV_TIME;
 685         return 0;
 686 }
 687
 688 static const struct i2c_device_id max6697_id[];
 689
 690 static int max6697_probe(struct i2c_client *client)
 691 {
 692         struct i2c_adapter *adapter = client->adapter;
 693         struct device *dev = &client->dev;
 694         struct max6697_data *data;
 695         struct device *hwmon_dev;
 696         int err;
 697
 698         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 699                 return -ENODEV;
 700
 701         data = devm_kzalloc(dev, sizeof(struct max6697_data), GFP_KERNEL);
 702         if (!data)
 703                 return -ENOMEM;
 704
 705         if (client->dev.of_node)
 706                 data->type = (enum chips)of_device_get_match_data(&client->dev);
 707         else
 708                 data->type = i2c_match_id(max6697_id, client)->driver_data;
 709         data->chip = &max6697_chip_data[data->type];
 710         data->client = client;
 711         mutex_init(&data->update_lock);
 712
 713         err = max6697_init_chip(data, client);
 714         if (err)
 715                 return err;
 716
 717         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 718                                                            data,
 719                                                            max6697_groups);
 720         return PTR_ERR_OR_ZERO(hwmon_dev);
 721 }
 722
 723 static const struct i2c_device_id max6697_id[] = {
 724         { "max6581", max6581 },
 725         { "max6602", max6602 },
 726         { "max6622", max6622 },
 727         { "max6636", max6636 },
 728         { "max6689", max6689 },
 729         { "max6693", max6693 },
 730         { "max6694", max6694 },
 731         { "max6697", max6697 },
 732         { "max6698", max6698 },
 733         { "max6699", max6699 },
 734         { }
 735 };
 736 MODULE_DEVICE_TABLE(i2c, max6697_id);
 737
 738 static const struct of_device_id __maybe_unused max6697_of_match[] = {
 739         {
 740                 .compatible = "maxim,max6581",
 741                 .data = (void *)max6581
 742         },
 743         {
 744                 .compatible = "maxim,max6602",
 745                 .data = (void *)max6602
 746         },
 747         {
 748                 .compatible = "maxim,max6622",
 749                 .data = (void *)max6622
 750         },
 751         {
 752                 .compatible = "maxim,max6636",
 753                 .data = (void *)max6636
 754         },
 755         {
 756                 .compatible = "maxim,max6689",
 757                 .data = (void *)max6689
 758         },
 759         {
 760                 .compatible = "maxim,max6693",
 761                 .data = (void *)max6693
 762         },
 763         {
 764                 .compatible = "maxim,max6694",
 765                 .data = (void *)max6694
 766         },
 767         {
 768                 .compatible = "maxim,max6697",
 769                 .data = (void *)max6697
 770         },
 771         {
 772                 .compatible = "maxim,max6698",
 773                 .data = (void *)max6698
 774         },
 775         {
 776                 .compatible = "maxim,max6699",
 777                 .data = (void *)max6699
 778         },
 779         { },
 780 };
 781 MODULE_DEVICE_TABLE(of, max6697_of_match);
 782
 783 static struct i2c_driver max6697_driver = {
 784         .class = I2C_CLASS_HWMON,
 785         .driver = {
 786                 .name   = "max6697",
 787                 .of_match_table = of_match_ptr(max6697_of_match),
 788         },
 789         .probe_new = max6697_probe,
 790         .id_table = max6697_id,
 791 };
 792
 793 module_i2c_driver(max6697_driver);
 794
 795 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
 796 MODULE_DESCRIPTION("MAX6697 temperature sensor driver");
 797 MODULE_LICENSE("GPL");