drivers/hwmon/sch5627.c

   1 /***************************************************************************
   2  *   Copyright (C) 2010-2012 Hans de Goede <hdegoede@redhat.com>           *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  18  ***************************************************************************/
  19
  20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  21
  22 #include <linux/module.h>
  23 #include <linux/init.h>
  24 #include <linux/slab.h>
  25 #include <linux/jiffies.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/hwmon.h>
  28 #include <linux/hwmon-sysfs.h>
  29 #include <linux/err.h>
  30 #include <linux/mutex.h>
  31 #include "sch56xx-common.h"
  32
  33 #define DRVNAME "sch5627"
  34 #define DEVNAME DRVNAME /* We only support one model */
  35
  36 #define SCH5627_HWMON_ID                0xa5
  37 #define SCH5627_COMPANY_ID              0x5c
  38 #define SCH5627_PRIMARY_ID              0xa0
  39
  40 #define SCH5627_REG_BUILD_CODE          0x39
  41 #define SCH5627_REG_BUILD_ID            0x3a
  42 #define SCH5627_REG_HWMON_ID            0x3c
  43 #define SCH5627_REG_HWMON_REV           0x3d
  44 #define SCH5627_REG_COMPANY_ID          0x3e
  45 #define SCH5627_REG_PRIMARY_ID          0x3f
  46 #define SCH5627_REG_CTRL                0x40
  47
  48 #define SCH5627_NO_TEMPS                8
  49 #define SCH5627_NO_FANS                 4
  50 #define SCH5627_NO_IN                   5
  51
  52 static const u16 SCH5627_REG_TEMP_MSB[SCH5627_NO_TEMPS] = {
  53         0x2B, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x180, 0x181 };
  54 static const u16 SCH5627_REG_TEMP_LSN[SCH5627_NO_TEMPS] = {
  55         0xE2, 0xE1, 0xE1, 0xE5, 0xE5, 0xE6, 0x182, 0x182 };
  56 static const u16 SCH5627_REG_TEMP_HIGH_NIBBLE[SCH5627_NO_TEMPS] = {
  57         0, 0, 1, 1, 0, 0, 0, 1 };
  58 static const u16 SCH5627_REG_TEMP_HIGH[SCH5627_NO_TEMPS] = {
  59         0x61, 0x57, 0x59, 0x5B, 0x5D, 0x5F, 0x184, 0x186 };
  60 static const u16 SCH5627_REG_TEMP_ABS[SCH5627_NO_TEMPS] = {
  61         0x9B, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x1A8, 0x1A9 };
  62
  63 static const u16 SCH5627_REG_FAN[SCH5627_NO_FANS] = {
  64         0x2C, 0x2E, 0x30, 0x32 };
  65 static const u16 SCH5627_REG_FAN_MIN[SCH5627_NO_FANS] = {
  66         0x62, 0x64, 0x66, 0x68 };
  67
  68 static const u16 SCH5627_REG_IN_MSB[SCH5627_NO_IN] = {
  69         0x22, 0x23, 0x24, 0x25, 0x189 };
  70 static const u16 SCH5627_REG_IN_LSN[SCH5627_NO_IN] = {
  71         0xE4, 0xE4, 0xE3, 0xE3, 0x18A };
  72 static const u16 SCH5627_REG_IN_HIGH_NIBBLE[SCH5627_NO_IN] = {
  73         1, 0, 1, 0, 1 };
  74 static const u16 SCH5627_REG_IN_FACTOR[SCH5627_NO_IN] = {
  75         10745, 3660, 9765, 10745, 3660 };
  76 static const char * const SCH5627_IN_LABELS[SCH5627_NO_IN] = {
  77         "VCC", "VTT", "VBAT", "VTR", "V_IN" };
  78
  79 struct sch5627_data {
  80         unsigned short addr;
  81         struct device *hwmon_dev;
  82         struct sch56xx_watchdog_data *watchdog;
  83         u8 control;
  84         u8 temp_max[SCH5627_NO_TEMPS];
  85         u8 temp_crit[SCH5627_NO_TEMPS];
  86         u16 fan_min[SCH5627_NO_FANS];
  87
  88         struct mutex update_lock;
  89         unsigned long last_battery;     /* In jiffies */
  90         char valid;                     /* !=0 if following fields are valid */
  91         unsigned long last_updated;     /* In jiffies */
  92         u16 temp[SCH5627_NO_TEMPS];
  93         u16 fan[SCH5627_NO_FANS];
  94         u16 in[SCH5627_NO_IN];
  95 };
  96
  97 static struct sch5627_data *sch5627_update_device(struct device *dev)
  98 {
  99         struct sch5627_data *data = dev_get_drvdata(dev);
 100         struct sch5627_data *ret = data;
 101         int i, val;
 102
 103         mutex_lock(&data->update_lock);
 104
 105         /* Trigger a Vbat voltage measurement every 5 minutes */
 106         if (time_after(jiffies, data->last_battery + 300 * HZ)) {
 107                 sch56xx_write_virtual_reg(data->addr, SCH5627_REG_CTRL,
 108                                           data->control | 0x10);
 109                 data->last_battery = jiffies;
 110         }
 111
 112         /* Cache the values for 1 second */
 113         if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 114                 for (i = 0; i < SCH5627_NO_TEMPS; i++) {
 115                         val = sch56xx_read_virtual_reg12(data->addr,
 116                                 SCH5627_REG_TEMP_MSB[i],
 117                                 SCH5627_REG_TEMP_LSN[i],
 118                                 SCH5627_REG_TEMP_HIGH_NIBBLE[i]);
 119                         if (unlikely(val < 0)) {
 120                                 ret = ERR_PTR(val);
 121                                 goto abort;
 122                         }
 123                         data->temp[i] = val;
 124                 }
 125
 126                 for (i = 0; i < SCH5627_NO_FANS; i++) {
 127                         val = sch56xx_read_virtual_reg16(data->addr,
 128                                                          SCH5627_REG_FAN[i]);
 129                         if (unlikely(val < 0)) {
 130                                 ret = ERR_PTR(val);
 131                                 goto abort;
 132                         }
 133                         data->fan[i] = val;
 134                 }
 135
 136                 for (i = 0; i < SCH5627_NO_IN; i++) {
 137                         val = sch56xx_read_virtual_reg12(data->addr,
 138                                 SCH5627_REG_IN_MSB[i],
 139                                 SCH5627_REG_IN_LSN[i],
 140                                 SCH5627_REG_IN_HIGH_NIBBLE[i]);
 141                         if (unlikely(val < 0)) {
 142                                 ret = ERR_PTR(val);
 143                                 goto abort;
 144                         }
 145                         data->in[i] = val;
 146                 }
 147
 148                 data->last_updated = jiffies;
 149                 data->valid = 1;
 150         }
 151 abort:
 152         mutex_unlock(&data->update_lock);
 153         return ret;
 154 }
 155
 156 static int sch5627_read_limits(struct sch5627_data *data)
 157 {
 158         int i, val;
 159
 160         for (i = 0; i < SCH5627_NO_TEMPS; i++) {
 161                 /*
 162                  * Note what SMSC calls ABS, is what lm_sensors calls max
 163                  * (aka high), and HIGH is what lm_sensors calls crit.
 164                  */
 165                 val = sch56xx_read_virtual_reg(data->addr,
 166                                                SCH5627_REG_TEMP_ABS[i]);
 167                 if (val < 0)
 168                         return val;
 169                 data->temp_max[i] = val;
 170
 171                 val = sch56xx_read_virtual_reg(data->addr,
 172                                                SCH5627_REG_TEMP_HIGH[i]);
 173                 if (val < 0)
 174                         return val;
 175                 data->temp_crit[i] = val;
 176         }
 177         for (i = 0; i < SCH5627_NO_FANS; i++) {
 178                 val = sch56xx_read_virtual_reg16(data->addr,
 179                                                  SCH5627_REG_FAN_MIN[i]);
 180                 if (val < 0)
 181                         return val;
 182                 data->fan_min[i] = val;
 183         }
 184
 185         return 0;
 186 }
 187
 188 static int reg_to_temp(u16 reg)
 189 {
 190         return (reg * 625) / 10 - 64000;
 191 }
 192
 193 static int reg_to_temp_limit(u8 reg)
 194 {
 195         return (reg - 64) * 1000;
 196 }
 197
 198 static int reg_to_rpm(u16 reg)
 199 {
 200         if (reg == 0)
 201                 return -EIO;
 202         if (reg == 0xffff)
 203                 return 0;
 204
 205         return 5400540 / reg;
 206 }
 207
 208 static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
 209         char *buf)
 210 {
 211         return snprintf(buf, PAGE_SIZE, "%s\n", DEVNAME);
 212 }
 213
 214 static ssize_t show_temp(struct device *dev, struct device_attribute
 215         *devattr, char *buf)
 216 {
 217         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 218         struct sch5627_data *data = sch5627_update_device(dev);
 219         int val;
 220
 221         if (IS_ERR(data))
 222                 return PTR_ERR(data);
 223
 224         val = reg_to_temp(data->temp[attr->index]);
 225         return snprintf(buf, PAGE_SIZE, "%d\n", val);
 226 }
 227
 228 static ssize_t show_temp_fault(struct device *dev, struct device_attribute
 229         *devattr, char *buf)
 230 {
 231         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 232         struct sch5627_data *data = sch5627_update_device(dev);
 233
 234         if (IS_ERR(data))
 235                 return PTR_ERR(data);
 236
 237         return snprintf(buf, PAGE_SIZE, "%d\n", data->temp[attr->index] == 0);
 238 }
 239
 240 static ssize_t show_temp_max(struct device *dev, struct device_attribute
 241         *devattr, char *buf)
 242 {
 243         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 244         struct sch5627_data *data = dev_get_drvdata(dev);
 245         int val;
 246
 247         val = reg_to_temp_limit(data->temp_max[attr->index]);
 248         return snprintf(buf, PAGE_SIZE, "%d\n", val);
 249 }
 250
 251 static ssize_t show_temp_crit(struct device *dev, struct device_attribute
 252         *devattr, char *buf)
 253 {
 254         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 255         struct sch5627_data *data = dev_get_drvdata(dev);
 256         int val;
 257
 258         val = reg_to_temp_limit(data->temp_crit[attr->index]);
 259         return snprintf(buf, PAGE_SIZE, "%d\n", val);
 260 }
 261
 262 static ssize_t show_fan(struct device *dev, struct device_attribute
 263         *devattr, char *buf)
 264 {
 265         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 266         struct sch5627_data *data = sch5627_update_device(dev);
 267         int val;
 268
 269         if (IS_ERR(data))
 270                 return PTR_ERR(data);
 271
 272         val = reg_to_rpm(data->fan[attr->index]);
 273         if (val < 0)
 274                 return val;
 275
 276         return snprintf(buf, PAGE_SIZE, "%d\n", val);
 277 }
 278
 279 static ssize_t show_fan_fault(struct device *dev, struct device_attribute
 280         *devattr, char *buf)
 281 {
 282         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 283         struct sch5627_data *data = sch5627_update_device(dev);
 284
 285         if (IS_ERR(data))
 286                 return PTR_ERR(data);
 287
 288         return snprintf(buf, PAGE_SIZE, "%d\n",
 289                         data->fan[attr->index] == 0xffff);
 290 }
 291
 292 static ssize_t show_fan_min(struct device *dev, struct device_attribute
 293         *devattr, char *buf)
 294 {
 295         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 296         struct sch5627_data *data = dev_get_drvdata(dev);
 297         int val = reg_to_rpm(data->fan_min[attr->index]);
 298         if (val < 0)
 299                 return val;
 300
 301         return snprintf(buf, PAGE_SIZE, "%d\n", val);
 302 }
 303
 304 static ssize_t show_in(struct device *dev, struct device_attribute
 305         *devattr, char *buf)
 306 {
 307         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 308         struct sch5627_data *data = sch5627_update_device(dev);
 309         int val;
 310
 311         if (IS_ERR(data))
 312                 return PTR_ERR(data);
 313
 314         val = DIV_ROUND_CLOSEST(
 315                 data->in[attr->index] * SCH5627_REG_IN_FACTOR[attr->index],
 316                 10000);
 317         return snprintf(buf, PAGE_SIZE, "%d\n", val);
 318 }
 319
 320 static ssize_t show_in_label(struct device *dev, struct device_attribute
 321         *devattr, char *buf)
 322 {
 323         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 324
 325         return snprintf(buf, PAGE_SIZE, "%s\n",
 326                         SCH5627_IN_LABELS[attr->index]);
 327 }
 328
 329 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 330 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
 331 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
 332 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
 333 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
 334 static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp, NULL, 4);
 335 static SENSOR_DEVICE_ATTR(temp6_input, S_IRUGO, show_temp, NULL, 5);
 336 static SENSOR_DEVICE_ATTR(temp7_input, S_IRUGO, show_temp, NULL, 6);
 337 static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, show_temp, NULL, 7);
 338 static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_temp_fault, NULL, 0);
 339 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_temp_fault, NULL, 1);
 340 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_temp_fault, NULL, 2);
 341 static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_temp_fault, NULL, 3);
 342 static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_temp_fault, NULL, 4);
 343 static SENSOR_DEVICE_ATTR(temp6_fault, S_IRUGO, show_temp_fault, NULL, 5);
 344 static SENSOR_DEVICE_ATTR(temp7_fault, S_IRUGO, show_temp_fault, NULL, 6);
 345 static SENSOR_DEVICE_ATTR(temp8_fault, S_IRUGO, show_temp_fault, NULL, 7);
 346 static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max, NULL, 0);
 347 static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO, show_temp_max, NULL, 1);
 348 static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp_max, NULL, 2);
 349 static SENSOR_DEVICE_ATTR(temp4_max, S_IRUGO, show_temp_max, NULL, 3);
 350 static SENSOR_DEVICE_ATTR(temp5_max, S_IRUGO, show_temp_max, NULL, 4);
 351 static SENSOR_DEVICE_ATTR(temp6_max, S_IRUGO, show_temp_max, NULL, 5);
 352 static SENSOR_DEVICE_ATTR(temp7_max, S_IRUGO, show_temp_max, NULL, 6);
 353 static SENSOR_DEVICE_ATTR(temp8_max, S_IRUGO, show_temp_max, NULL, 7);
 354 static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit, NULL, 0);
 355 static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp_crit, NULL, 1);
 356 static SENSOR_DEVICE_ATTR(temp3_crit, S_IRUGO, show_temp_crit, NULL, 2);
 357 static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO, show_temp_crit, NULL, 3);
 358 static SENSOR_DEVICE_ATTR(temp5_crit, S_IRUGO, show_temp_crit, NULL, 4);
 359 static SENSOR_DEVICE_ATTR(temp6_crit, S_IRUGO, show_temp_crit, NULL, 5);
 360 static SENSOR_DEVICE_ATTR(temp7_crit, S_IRUGO, show_temp_crit, NULL, 6);
 361 static SENSOR_DEVICE_ATTR(temp8_crit, S_IRUGO, show_temp_crit, NULL, 7);
 362
 363 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
 364 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
 365 static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2);
 366 static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3);
 367 static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, show_fan_fault, NULL, 0);
 368 static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, show_fan_fault, NULL, 1);
 369 static SENSOR_DEVICE_ATTR(fan3_fault, S_IRUGO, show_fan_fault, NULL, 2);
 370 static SENSOR_DEVICE_ATTR(fan4_fault, S_IRUGO, show_fan_fault, NULL, 3);
 371 static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO, show_fan_min, NULL, 0);
 372 static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO, show_fan_min, NULL, 1);
 373 static SENSOR_DEVICE_ATTR(fan3_min, S_IRUGO, show_fan_min, NULL, 2);
 374 static SENSOR_DEVICE_ATTR(fan4_min, S_IRUGO, show_fan_min, NULL, 3);
 375
 376 static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, show_in, NULL, 0);
 377 static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_in, NULL, 1);
 378 static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_in, NULL, 2);
 379 static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_in, NULL, 3);
 380 static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_in, NULL, 4);
 381 static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_in_label, NULL, 0);
 382 static SENSOR_DEVICE_ATTR(in1_label, S_IRUGO, show_in_label, NULL, 1);
 383 static SENSOR_DEVICE_ATTR(in2_label, S_IRUGO, show_in_label, NULL, 2);
 384 static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_in_label, NULL, 3);
 385
 386 static struct attribute *sch5627_attributes[] = {
 387         &dev_attr_name.attr,
 388
 389         &sensor_dev_attr_temp1_input.dev_attr.attr,
 390         &sensor_dev_attr_temp2_input.dev_attr.attr,
 391         &sensor_dev_attr_temp3_input.dev_attr.attr,
 392         &sensor_dev_attr_temp4_input.dev_attr.attr,
 393         &sensor_dev_attr_temp5_input.dev_attr.attr,
 394         &sensor_dev_attr_temp6_input.dev_attr.attr,
 395         &sensor_dev_attr_temp7_input.dev_attr.attr,
 396         &sensor_dev_attr_temp8_input.dev_attr.attr,
 397         &sensor_dev_attr_temp1_fault.dev_attr.attr,
 398         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 399         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 400         &sensor_dev_attr_temp4_fault.dev_attr.attr,
 401         &sensor_dev_attr_temp5_fault.dev_attr.attr,
 402         &sensor_dev_attr_temp6_fault.dev_attr.attr,
 403         &sensor_dev_attr_temp7_fault.dev_attr.attr,
 404         &sensor_dev_attr_temp8_fault.dev_attr.attr,
 405         &sensor_dev_attr_temp1_max.dev_attr.attr,
 406         &sensor_dev_attr_temp2_max.dev_attr.attr,
 407         &sensor_dev_attr_temp3_max.dev_attr.attr,
 408         &sensor_dev_attr_temp4_max.dev_attr.attr,
 409         &sensor_dev_attr_temp5_max.dev_attr.attr,
 410         &sensor_dev_attr_temp6_max.dev_attr.attr,
 411         &sensor_dev_attr_temp7_max.dev_attr.attr,
 412         &sensor_dev_attr_temp8_max.dev_attr.attr,
 413         &sensor_dev_attr_temp1_crit.dev_attr.attr,
 414         &sensor_dev_attr_temp2_crit.dev_attr.attr,
 415         &sensor_dev_attr_temp3_crit.dev_attr.attr,
 416         &sensor_dev_attr_temp4_crit.dev_attr.attr,
 417         &sensor_dev_attr_temp5_crit.dev_attr.attr,
 418         &sensor_dev_attr_temp6_crit.dev_attr.attr,
 419         &sensor_dev_attr_temp7_crit.dev_attr.attr,
 420         &sensor_dev_attr_temp8_crit.dev_attr.attr,
 421
 422         &sensor_dev_attr_fan1_input.dev_attr.attr,
 423         &sensor_dev_attr_fan2_input.dev_attr.attr,
 424         &sensor_dev_attr_fan3_input.dev_attr.attr,
 425         &sensor_dev_attr_fan4_input.dev_attr.attr,
 426         &sensor_dev_attr_fan1_fault.dev_attr.attr,
 427         &sensor_dev_attr_fan2_fault.dev_attr.attr,
 428         &sensor_dev_attr_fan3_fault.dev_attr.attr,
 429         &sensor_dev_attr_fan4_fault.dev_attr.attr,
 430         &sensor_dev_attr_fan1_min.dev_attr.attr,
 431         &sensor_dev_attr_fan2_min.dev_attr.attr,
 432         &sensor_dev_attr_fan3_min.dev_attr.attr,
 433         &sensor_dev_attr_fan4_min.dev_attr.attr,
 434
 435         &sensor_dev_attr_in0_input.dev_attr.attr,
 436         &sensor_dev_attr_in1_input.dev_attr.attr,
 437         &sensor_dev_attr_in2_input.dev_attr.attr,
 438         &sensor_dev_attr_in3_input.dev_attr.attr,
 439         &sensor_dev_attr_in4_input.dev_attr.attr,
 440         &sensor_dev_attr_in0_label.dev_attr.attr,
 441         &sensor_dev_attr_in1_label.dev_attr.attr,
 442         &sensor_dev_attr_in2_label.dev_attr.attr,
 443         &sensor_dev_attr_in3_label.dev_attr.attr,
 444         /* No in4_label as in4 is a generic input pin */
 445
 446         NULL
 447 };
 448
 449 static const struct attribute_group sch5627_group = {
 450         .attrs = sch5627_attributes,
 451 };
 452
 453 static int sch5627_remove(struct platform_device *pdev)
 454 {
 455         struct sch5627_data *data = platform_get_drvdata(pdev);
 456
 457         if (data->watchdog)
 458                 sch56xx_watchdog_unregister(data->watchdog);
 459
 460         if (data->hwmon_dev)
 461                 hwmon_device_unregister(data->hwmon_dev);
 462
 463         sysfs_remove_group(&pdev->dev.kobj, &sch5627_group);
 464
 465         return 0;
 466 }
 467
 468 static int sch5627_probe(struct platform_device *pdev)
 469 {
 470         struct sch5627_data *data;
 471         int err, build_code, build_id, hwmon_rev, val;
 472
 473         data = devm_kzalloc(&pdev->dev, sizeof(struct sch5627_data),
 474                             GFP_KERNEL);
 475         if (!data)
 476                 return -ENOMEM;
 477
 478         data->addr = platform_get_resource(pdev, IORESOURCE_IO, 0)->start;
 479         mutex_init(&data->update_lock);
 480         platform_set_drvdata(pdev, data);
 481
 482         val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_HWMON_ID);
 483         if (val < 0) {
 484                 err = val;
 485                 goto error;
 486         }
 487         if (val != SCH5627_HWMON_ID) {
 488                 pr_err("invalid %s id: 0x%02X (expected 0x%02X)\n", "hwmon",
 489                        val, SCH5627_HWMON_ID);
 490                 err = -ENODEV;
 491                 goto error;
 492         }
 493
 494         val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_COMPANY_ID);
 495         if (val < 0) {
 496                 err = val;
 497                 goto error;
 498         }
 499         if (val != SCH5627_COMPANY_ID) {
 500                 pr_err("invalid %s id: 0x%02X (expected 0x%02X)\n", "company",
 501                        val, SCH5627_COMPANY_ID);
 502                 err = -ENODEV;
 503                 goto error;
 504         }
 505
 506         val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_PRIMARY_ID);
 507         if (val < 0) {
 508                 err = val;
 509                 goto error;
 510         }
 511         if (val != SCH5627_PRIMARY_ID) {
 512                 pr_err("invalid %s id: 0x%02X (expected 0x%02X)\n", "primary",
 513                        val, SCH5627_PRIMARY_ID);
 514                 err = -ENODEV;
 515                 goto error;
 516         }
 517
 518         build_code = sch56xx_read_virtual_reg(data->addr,
 519                                               SCH5627_REG_BUILD_CODE);
 520         if (build_code < 0) {
 521                 err = build_code;
 522                 goto error;
 523         }
 524
 525         build_id = sch56xx_read_virtual_reg16(data->addr,
 526                                               SCH5627_REG_BUILD_ID);
 527         if (build_id < 0) {
 528                 err = build_id;
 529                 goto error;
 530         }
 531
 532         hwmon_rev = sch56xx_read_virtual_reg(data->addr,
 533                                              SCH5627_REG_HWMON_REV);
 534         if (hwmon_rev < 0) {
 535                 err = hwmon_rev;
 536                 goto error;
 537         }
 538
 539         val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_CTRL);
 540         if (val < 0) {
 541                 err = val;
 542                 goto error;
 543         }
 544         data->control = val;
 545         if (!(data->control & 0x01)) {
 546                 pr_err("hardware monitoring not enabled\n");
 547                 err = -ENODEV;
 548                 goto error;
 549         }
 550         /* Trigger a Vbat voltage measurement, so that we get a valid reading
 551            the first time we read Vbat */
 552         sch56xx_write_virtual_reg(data->addr, SCH5627_REG_CTRL,
 553                                   data->control | 0x10);
 554         data->last_battery = jiffies;
 555
 556         /*
 557          * Read limits, we do this only once as reading a register on
 558          * the sch5627 is quite expensive (and they don't change).
 559          */
 560         err = sch5627_read_limits(data);
 561         if (err)
 562                 goto error;
 563
 564         pr_info("found %s chip at %#hx\n", DEVNAME, data->addr);
 565         pr_info("firmware build: code 0x%02X, id 0x%04X, hwmon: rev 0x%02X\n",
 566                 build_code, build_id, hwmon_rev);
 567
 568         /* Register sysfs interface files */
 569         err = sysfs_create_group(&pdev->dev.kobj, &sch5627_group);
 570         if (err)
 571                 goto error;
 572
 573         data->hwmon_dev = hwmon_device_register(&pdev->dev);
 574         if (IS_ERR(data->hwmon_dev)) {
 575                 err = PTR_ERR(data->hwmon_dev);
 576                 data->hwmon_dev = NULL;
 577                 goto error;
 578         }
 579
 580         /* Note failing to register the watchdog is not a fatal error */
 581         data->watchdog = sch56xx_watchdog_register(&pdev->dev, data->addr,
 582                         (build_code << 24) | (build_id << 8) | hwmon_rev,
 583                         &data->update_lock, 1);
 584
 585         return 0;
 586
 587 error:
 588         sch5627_remove(pdev);
 589         return err;
 590 }
 591
 592 static struct platform_driver sch5627_driver = {
 593         .driver = {
 594                 .owner  = THIS_MODULE,
 595                 .name   = DRVNAME,
 596         },
 597         .probe          = sch5627_probe,
 598         .remove         = sch5627_remove,
 599 };
 600
 601 module_platform_driver(sch5627_driver);
 602
 603 MODULE_DESCRIPTION("SMSC SCH5627 Hardware Monitoring Driver");
 604 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
 605 MODULE_LICENSE("GPL");