linux/drivers/hwmon/max6697.c
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   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.h>
  28
  29#include <linux/platform_data/max6697.h>
  30
  31enum chips { max6581, max6602, max6622, max6636, max6689, max6693, max6694,
  32             max6697, max6698, max6699 };
  33
  34/* Report local sensor as temp1 */
  35
  36static const u8 MAX6697_REG_TEMP[] = {
  37                        0x07, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x08 };
  38static const u8 MAX6697_REG_TEMP_EXT[] = {
  39                        0x57, 0x09, 0x52, 0x53, 0x54, 0x55, 0x56, 0 };
  40static const u8 MAX6697_REG_MAX[] = {
  41                        0x17, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x18 };
  42static const u8 MAX6697_REG_CRIT[] = {
  43                        0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27 };
  44
  45/*
  46 * Map device tree / platform data register bit map to chip bit map.
  47 * Applies to alert register and over-temperature register.
  48 */
  49#define MAX6697_MAP_BITS(reg)   ((((reg) & 0x7e) >> 1) | \
  50                                 (((reg) & 0x01) << 6) | ((reg) & 0x80))
  51
  52#define MAX6697_REG_STAT(n)             (0x44 + (n))
  53
  54#define MAX6697_REG_CONFIG              0x41
  55#define MAX6581_CONF_EXTENDED           (1 << 1)
  56#define MAX6693_CONF_BETA               (1 << 2)
  57#define MAX6697_CONF_RESISTANCE         (1 << 3)
  58#define MAX6697_CONF_TIMEOUT            (1 << 5)
  59#define MAX6697_REG_ALERT_MASK          0x42
  60#define MAX6697_REG_OVERT_MASK          0x43
  61
  62#define MAX6581_REG_RESISTANCE          0x4a
  63#define MAX6581_REG_IDEALITY            0x4b
  64#define MAX6581_REG_IDEALITY_SELECT     0x4c
  65#define MAX6581_REG_OFFSET              0x4d
  66#define MAX6581_REG_OFFSET_SELECT       0x4e
  67
  68#define MAX6697_CONV_TIME               156     /* ms per channel, worst case */
  69
  70struct max6697_chip_data {
  71        int channels;
  72        u32 have_ext;
  73        u32 have_crit;
  74        u32 have_fault;
  75        u8 valid_conf;
  76        const u8 *alarm_map;
  77};
  78
  79struct max6697_data {
  80        struct device *hwmon_dev;
  81
  82        enum chips type;
  83        const struct max6697_chip_data *chip;
  84
  85        int update_interval;    /* in milli-seconds */
  86        int temp_offset;        /* in degrees C */
  87
  88        struct mutex update_lock;
  89        unsigned long last_updated;     /* In jiffies */
  90        bool valid;             /* true if following fields are valid */
  91
  92        /* 1x local and up to 7x remote */
  93        u8 temp[8][4];          /* [nr][0]=temp [1]=ext [2]=max [3]=crit */
  94#define MAX6697_TEMP_INPUT      0
  95#define MAX6697_TEMP_EXT        1
  96#define MAX6697_TEMP_MAX        2
  97#define MAX6697_TEMP_CRIT       3
  98        u32 alarms;
  99};
 100
 101/* Diode fault status bits on MAX6581 are right shifted by one bit */
 102static const u8 max6581_alarm_map[] = {
 103         0, 0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15,
 104         16, 17, 18, 19, 20, 21, 22, 23 };
 105
 106static const struct max6697_chip_data max6697_chip_data[] = {
 107        [max6581] = {
 108                .channels = 8,
 109                .have_crit = 0xff,
 110                .have_ext = 0x7f,
 111                .have_fault = 0xfe,
 112                .valid_conf = MAX6581_CONF_EXTENDED | MAX6697_CONF_TIMEOUT,
 113                .alarm_map = max6581_alarm_map,
 114        },
 115        [max6602] = {
 116                .channels = 5,
 117                .have_crit = 0x12,
 118                .have_ext = 0x02,
 119                .have_fault = 0x1e,
 120                .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 121        },
 122        [max6622] = {
 123                .channels = 5,
 124                .have_crit = 0x12,
 125                .have_ext = 0x02,
 126                .have_fault = 0x1e,
 127                .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 128        },
 129        [max6636] = {
 130                .channels = 7,
 131                .have_crit = 0x72,
 132                .have_ext = 0x02,
 133                .have_fault = 0x7e,
 134                .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 135        },
 136        [max6689] = {
 137                .channels = 7,
 138                .have_crit = 0x72,
 139                .have_ext = 0x02,
 140                .have_fault = 0x7e,
 141                .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 142        },
 143        [max6693] = {
 144                .channels = 7,
 145                .have_crit = 0x72,
 146                .have_ext = 0x02,
 147                .have_fault = 0x7e,
 148                .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
 149                  MAX6697_CONF_TIMEOUT,
 150        },
 151        [max6694] = {
 152                .channels = 5,
 153                .have_crit = 0x12,
 154                .have_ext = 0x02,
 155                .have_fault = 0x1e,
 156                .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
 157                  MAX6697_CONF_TIMEOUT,
 158        },
 159        [max6697] = {
 160                .channels = 7,
 161                .have_crit = 0x72,
 162                .have_ext = 0x02,
 163                .have_fault = 0x7e,
 164                .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 165        },
 166        [max6698] = {
 167                .channels = 7,
 168                .have_crit = 0x72,
 169                .have_ext = 0x02,
 170                .have_fault = 0x0e,
 171                .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 172        },
 173        [max6699] = {
 174                .channels = 5,
 175                .have_crit = 0x12,
 176                .have_ext = 0x02,
 177                .have_fault = 0x1e,
 178                .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
 179        },
 180};
 181
 182static struct max6697_data *max6697_update_device(struct device *dev)
 183{
 184        struct i2c_client *client = to_i2c_client(dev);
 185        struct max6697_data *data = i2c_get_clientdata(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;
 246abort:
 247        mutex_unlock(&data->update_lock);
 248
 249        return ret;
 250}
 251
 252static ssize_t show_temp_input(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
 268static ssize_t show_temp(struct device *dev,
 269                         struct device_attribute *devattr, 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
 285static ssize_t show_alarm(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
 300static ssize_t set_temp(struct device *dev,
 301                        struct device_attribute *devattr,
 302                        const char *buf, 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 i2c_client *client = to_i2c_client(dev);
 307        struct max6697_data *data = i2c_get_clientdata(client);
 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(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
 328static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL, 0);
 329static SENSOR_DEVICE_ATTR_2(temp1_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 330                            0, MAX6697_TEMP_MAX);
 331static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 332                            0, MAX6697_TEMP_CRIT);
 333
 334static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input, NULL, 1);
 335static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 336                            1, MAX6697_TEMP_MAX);
 337static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 338                            1, MAX6697_TEMP_CRIT);
 339
 340static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp_input, NULL, 2);
 341static SENSOR_DEVICE_ATTR_2(temp3_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 342                            2, MAX6697_TEMP_MAX);
 343static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 344                            2, MAX6697_TEMP_CRIT);
 345
 346static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp_input, NULL, 3);
 347static SENSOR_DEVICE_ATTR_2(temp4_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 348                            3, MAX6697_TEMP_MAX);
 349static SENSOR_DEVICE_ATTR_2(temp4_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 350                            3, MAX6697_TEMP_CRIT);
 351
 352static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp_input, NULL, 4);
 353static SENSOR_DEVICE_ATTR_2(temp5_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 354                            4, MAX6697_TEMP_MAX);
 355static SENSOR_DEVICE_ATTR_2(temp5_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 356                            4, MAX6697_TEMP_CRIT);
 357
 358static SENSOR_DEVICE_ATTR(temp6_input, S_IRUGO, show_temp_input, NULL, 5);
 359static SENSOR_DEVICE_ATTR_2(temp6_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 360                            5, MAX6697_TEMP_MAX);
 361static SENSOR_DEVICE_ATTR_2(temp6_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 362                            5, MAX6697_TEMP_CRIT);
 363
 364static SENSOR_DEVICE_ATTR(temp7_input, S_IRUGO, show_temp_input, NULL, 6);
 365static SENSOR_DEVICE_ATTR_2(temp7_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 366                            6, MAX6697_TEMP_MAX);
 367static SENSOR_DEVICE_ATTR_2(temp7_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 368                            6, MAX6697_TEMP_CRIT);
 369
 370static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, show_temp_input, NULL, 7);
 371static SENSOR_DEVICE_ATTR_2(temp8_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 372                            7, MAX6697_TEMP_MAX);
 373static SENSOR_DEVICE_ATTR_2(temp8_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 374                            7, MAX6697_TEMP_CRIT);
 375
 376static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 22);
 377static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 16);
 378static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 17);
 379static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 18);
 380static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO, show_alarm, NULL, 19);
 381static SENSOR_DEVICE_ATTR(temp6_max_alarm, S_IRUGO, show_alarm, NULL, 20);
 382static SENSOR_DEVICE_ATTR(temp7_max_alarm, S_IRUGO, show_alarm, NULL, 21);
 383static SENSOR_DEVICE_ATTR(temp8_max_alarm, S_IRUGO, show_alarm, NULL, 23);
 384
 385static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 14);
 386static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 8);
 387static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 9);
 388static SENSOR_DEVICE_ATTR(temp4_crit_alarm, S_IRUGO, show_alarm, NULL, 10);
 389static SENSOR_DEVICE_ATTR(temp5_crit_alarm, S_IRUGO, show_alarm, NULL, 11);
 390static SENSOR_DEVICE_ATTR(temp6_crit_alarm, S_IRUGO, show_alarm, NULL, 12);
 391static SENSOR_DEVICE_ATTR(temp7_crit_alarm, S_IRUGO, show_alarm, NULL, 13);
 392static SENSOR_DEVICE_ATTR(temp8_crit_alarm, S_IRUGO, show_alarm, NULL, 15);
 393
 394static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 1);
 395static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2);
 396static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_alarm, NULL, 3);
 397static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_alarm, NULL, 4);
 398static SENSOR_DEVICE_ATTR(temp6_fault, S_IRUGO, show_alarm, NULL, 5);
 399static SENSOR_DEVICE_ATTR(temp7_fault, S_IRUGO, show_alarm, NULL, 6);
 400static SENSOR_DEVICE_ATTR(temp8_fault, S_IRUGO, show_alarm, NULL, 7);
 401
 402static DEVICE_ATTR(dummy, 0, NULL, NULL);
 403
 404static 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 i2c_client *client = to_i2c_client(dev);
 409        struct max6697_data *data = i2c_get_clientdata(client);
 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 */
 430static 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
 489static const struct attribute_group max6697_group = {
 490        .attrs = max6697_attributes, .is_visible = max6697_is_visible,
 491};
 492
 493static 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        prop = of_get_property(node, "smbus-timeout-disable", &len);
 500        if (prop)
 501                pdata->smbus_timeout_disable = true;
 502        prop = of_get_property(node, "extended-range-enable", &len);
 503        if (prop)
 504                pdata->extended_range_enable = true;
 505        prop = of_get_property(node, "beta-compensation-enable", &len);
 506        if (prop)
 507                pdata->beta_compensation = true;
 508        prop = of_get_property(node, "alert-mask", &len);
 509        if (prop && len == sizeof(u32))
 510                pdata->alert_mask = be32_to_cpu(prop[0]);
 511        prop = of_get_property(node, "over-temperature-mask", &len);
 512        if (prop && len == sizeof(u32))
 513                pdata->over_temperature_mask = be32_to_cpu(prop[0]);
 514        prop = of_get_property(node, "resistance-cancellation", &len);
 515        if (prop) {
 516                if (len == sizeof(u32))
 517                        pdata->resistance_cancellation = be32_to_cpu(prop[0]);
 518                else
 519                        pdata->resistance_cancellation = 0xfe;
 520        }
 521        prop = of_get_property(node, "transistor-ideality", &len);
 522        if (prop && len == 2 * sizeof(u32)) {
 523                        pdata->ideality_mask = be32_to_cpu(prop[0]);
 524                        pdata->ideality_value = be32_to_cpu(prop[1]);
 525        }
 526}
 527
 528static int max6697_init_chip(struct i2c_client *client)
 529{
 530        struct max6697_data *data = i2c_get_clientdata(client);
 531        struct max6697_platform_data *pdata = dev_get_platdata(&client->dev);
 532        struct max6697_platform_data p;
 533        const struct max6697_chip_data *chip = data->chip;
 534        int factor = chip->channels;
 535        int ret, reg;
 536
 537        /*
 538         * Don't touch configuration if neither platform data nor OF
 539         * configuration was specified. If that is the case, use the
 540         * current chip configuration.
 541         */
 542        if (!pdata && !client->dev.of_node) {
 543                reg = i2c_smbus_read_byte_data(client, MAX6697_REG_CONFIG);
 544                if (reg < 0)
 545                        return reg;
 546                if (data->type == max6581) {
 547                        if (reg & MAX6581_CONF_EXTENDED)
 548                                data->temp_offset = 64;
 549                        reg = i2c_smbus_read_byte_data(client,
 550                                                       MAX6581_REG_RESISTANCE);
 551                        if (reg < 0)
 552                                return reg;
 553                        factor += hweight8(reg);
 554                } else {
 555                        if (reg & MAX6697_CONF_RESISTANCE)
 556                                factor++;
 557                }
 558                goto done;
 559        }
 560
 561        if (client->dev.of_node) {
 562                memset(&p, 0, sizeof(p));
 563                max6697_get_config_of(client->dev.of_node, &p);
 564                pdata = &p;
 565        }
 566
 567        reg = 0;
 568        if (pdata->smbus_timeout_disable &&
 569            (chip->valid_conf & MAX6697_CONF_TIMEOUT)) {
 570                reg |= MAX6697_CONF_TIMEOUT;
 571        }
 572        if (pdata->extended_range_enable &&
 573            (chip->valid_conf & MAX6581_CONF_EXTENDED)) {
 574                reg |= MAX6581_CONF_EXTENDED;
 575                data->temp_offset = 64;
 576        }
 577        if (pdata->resistance_cancellation &&
 578            (chip->valid_conf & MAX6697_CONF_RESISTANCE)) {
 579                reg |= MAX6697_CONF_RESISTANCE;
 580                factor++;
 581        }
 582        if (pdata->beta_compensation &&
 583            (chip->valid_conf & MAX6693_CONF_BETA)) {
 584                reg |= MAX6693_CONF_BETA;
 585        }
 586
 587        ret = i2c_smbus_write_byte_data(client, MAX6697_REG_CONFIG, reg);
 588        if (ret < 0)
 589                return ret;
 590
 591        ret = i2c_smbus_write_byte_data(client, MAX6697_REG_ALERT_MASK,
 592                                        MAX6697_MAP_BITS(pdata->alert_mask));
 593        if (ret < 0)
 594                return ret;
 595
 596        ret = i2c_smbus_write_byte_data(client, MAX6697_REG_OVERT_MASK,
 597                                MAX6697_MAP_BITS(pdata->over_temperature_mask));
 598        if (ret < 0)
 599                return ret;
 600
 601        if (data->type == max6581) {
 602                factor += hweight8(pdata->resistance_cancellation >> 1);
 603                ret = i2c_smbus_write_byte_data(client, MAX6581_REG_RESISTANCE,
 604                                        pdata->resistance_cancellation >> 1);
 605                if (ret < 0)
 606                        return ret;
 607                ret = i2c_smbus_write_byte_data(client, MAX6581_REG_IDEALITY,
 608                                                pdata->ideality_value);
 609                if (ret < 0)
 610                        return ret;
 611                ret = i2c_smbus_write_byte_data(client,
 612                                                MAX6581_REG_IDEALITY_SELECT,
 613                                                pdata->ideality_mask >> 1);
 614                if (ret < 0)
 615                        return ret;
 616        }
 617done:
 618        data->update_interval = factor * MAX6697_CONV_TIME;
 619        return 0;
 620}
 621
 622static int max6697_probe(struct i2c_client *client,
 623                         const struct i2c_device_id *id)
 624{
 625        struct i2c_adapter *adapter = client->adapter;
 626        struct device *dev = &client->dev;
 627        struct max6697_data *data;
 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        data->type = id->driver_data;
 638        data->chip = &max6697_chip_data[data->type];
 639
 640        i2c_set_clientdata(client, data);
 641        mutex_init(&data->update_lock);
 642
 643        err = max6697_init_chip(client);
 644        if (err)
 645                return err;
 646
 647        err = sysfs_create_group(&client->dev.kobj, &max6697_group);
 648        if (err)
 649                return err;
 650
 651        data->hwmon_dev = hwmon_device_register(dev);
 652        if (IS_ERR(data->hwmon_dev)) {
 653                err = PTR_ERR(data->hwmon_dev);
 654                goto error;
 655        }
 656
 657        return 0;
 658
 659error:
 660        sysfs_remove_group(&client->dev.kobj, &max6697_group);
 661        return err;
 662}
 663
 664static int max6697_remove(struct i2c_client *client)
 665{
 666        struct max6697_data *data = i2c_get_clientdata(client);
 667
 668        hwmon_device_unregister(data->hwmon_dev);
 669        sysfs_remove_group(&client->dev.kobj, &max6697_group);
 670
 671        return 0;
 672}
 673
 674static const struct i2c_device_id max6697_id[] = {
 675        { "max6581", max6581 },
 676        { "max6602", max6602 },
 677        { "max6622", max6622 },
 678        { "max6636", max6636 },
 679        { "max6689", max6689 },
 680        { "max6693", max6693 },
 681        { "max6694", max6694 },
 682        { "max6697", max6697 },
 683        { "max6698", max6698 },
 684        { "max6699", max6699 },
 685        { }
 686};
 687MODULE_DEVICE_TABLE(i2c, max6697_id);
 688
 689static struct i2c_driver max6697_driver = {
 690        .class = I2C_CLASS_HWMON,
 691        .driver = {
 692                .name   = "max6697",
 693        },
 694        .probe = max6697_probe,
 695        .remove = max6697_remove,
 696        .id_table = max6697_id,
 697};
 698
 699module_i2c_driver(max6697_driver);
 700
 701MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
 702MODULE_DESCRIPTION("MAX6697 temperature sensor driver");
 703MODULE_LICENSE("GPL");
 704
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