drivers/hwmon/sch5627.c

   1 /***************************************************************************
   2  *   Copyright (C) 2010-2011 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         u8 control;
  83         u8 temp_max[SCH5627_NO_TEMPS];
  84         u8 temp_crit[SCH5627_NO_TEMPS];
  85         u16 fan_min[SCH5627_NO_FANS];
  86
  87         struct mutex update_lock;
  88         unsigned long last_battery;     /* In jiffies */
  89         char valid;                     /* !=0 if following fields are valid */
  90         unsigned long last_updated;     /* In jiffies */
  91         u16 temp[SCH5627_NO_TEMPS];
  92         u16 fan[SCH5627_NO_FANS];
  93         u16 in[SCH5627_NO_IN];
  94 };
  95
  96 static struct sch5627_data *sch5627_update_device(struct device *dev)
  97 {
  98         struct sch5627_data *data = dev_get_drvdata(dev);
  99         struct sch5627_data *ret = data;
 100         int i, val;
 101
 102         mutex_lock(&data->update_lock);
 103
 104         /* Trigger a Vbat voltage measurement every 5 minutes */
 105         if (time_after(jiffies, data->last_battery + 300 * HZ)) {
 106                 sch56xx_write_virtual_reg(data->addr, SCH5627_REG_CTRL,
 107                                           data->control | 0x10);
 108                 data->last_battery = jiffies;
 109         }
 110
 111         /* Cache the values for 1 second */
 112         if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 113                 for (i = 0; i < SCH5627_NO_TEMPS; i++) {
 114                         val = sch56xx_read_virtual_reg12(data->addr,
 115                                 SCH5627_REG_TEMP_MSB[i],
 116                                 SCH5627_REG_TEMP_LSN[i],
 117                                 SCH5627_REG_TEMP_HIGH_NIBBLE[i]);
 118                         if (unlikely(val < 0)) {
 119                                 ret = ERR_PTR(val);
 120                                 goto abort;
 121                         }
 122                         data->temp[i] = val;
 123                 }
 124
 125                 for (i = 0; i < SCH5627_NO_FANS; i++) {
 126                         val = sch56xx_read_virtual_reg16(data->addr,
 127                                                          SCH5627_REG_FAN[i]);
 128                         if (unlikely(val < 0)) {
 129                                 ret = ERR_PTR(val);
 130                                 goto abort;
 131                         }
 132                         data->fan[i] = val;
 133                 }
 134
 135                 for (i = 0; i < SCH5627_NO_IN; i++) {
 136                         val = sch56xx_read_virtual_reg12(data->addr,
 137                                 SCH5627_REG_IN_MSB[i],
 138                                 SCH5627_REG_IN_LSN[i],
 139                                 SCH5627_REG_IN_HIGH_NIBBLE[i]);
 140                         if (unlikely(val < 0)) {
 141                                 ret = ERR_PTR(val);
 142                                 goto abort;
 143                         }
 144                         data->in[i] = val;
 145                 }
 146
 147                 data->last_updated = jiffies;
 148                 data->valid = 1;
 149         }
 150 abort:
 151         mutex_unlock(&data->update_lock);
 152         return ret;
 153 }
 154
 155 static int __devinit sch5627_read_limits(struct sch5627_data *data)
 156 {
 157         int i, val;
 158
 159         for (i = 0; i < SCH5627_NO_TEMPS; i++) {
 160                 /*
 161                  * Note what SMSC calls ABS, is what lm_sensors calls max
 162                  * (aka high), and HIGH is what lm_sensors calls crit.
 163                  */
 164                 val = sch56xx_read_virtual_reg(data->addr,
 165                                                SCH5627_REG_TEMP_ABS[i]);
 166                 if (val < 0)
 167                         return val;
 168                 data->temp_max[i] = val;
 169
 170                 val = sch56xx_read_virtual_reg(data->addr,
 171                                                SCH5627_REG_TEMP_HIGH[i]);
 172                 if (val < 0)
 173                         return val;
 174                 data->temp_crit[i] = val;
 175         }
 176         for (i = 0; i < SCH5627_NO_FANS; i++) {
 177                 val = sch56xx_read_virtual_reg16(data->addr,
 178                                                  SCH5627_REG_FAN_MIN[i]);
 179                 if (val < 0)
 180                         return val;
 181                 data->fan_min[i] = val;
 182         }
 183
 184         return 0;
 185 }
 186
 187 static int reg_to_temp(u16 reg)
 188 {
 189         return (reg * 625) / 10 - 64000;
 190 }
 191
 192 static int reg_to_temp_limit(u8 reg)
 193 {
 194         return (reg - 64) * 1000;
 195 }
 196
 197 static int reg_to_rpm(u16 reg)
 198 {
 199         if (reg == 0)
 200                 return -EIO;
 201         if (reg == 0xffff)
 202                 return 0;
 203
 204         return 5400540 / reg;
 205 }
 206
 207 static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
 208         char *buf)
 209 {
 210         return snprintf(buf, PAGE_SIZE, "%s\n", DEVNAME);
 211 }
 212
 213 static ssize_t show_temp(struct device *dev, struct device_attribute
 214         *devattr, char *buf)
 215 {
 216         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 217         struct sch5627_data *data = sch5627_update_device(dev);
 218         int val;
 219
 220         if (IS_ERR(data))
 221                 return PTR_ERR(data);
 222
 223         val = reg_to_temp(data->temp[attr->index]);
 224         return snprintf(buf, PAGE_SIZE, "%d\n", val);
 225 }
 226
 227 static ssize_t show_temp_fault(struct device *dev, struct device_attribute
 228         *devattr, char *buf)
 229 {
 230         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 231         struct sch5627_data *data = sch5627_update_device(dev);
 232
 233         if (IS_ERR(data))
 234                 return PTR_ERR(data);
 235
 236         return snprintf(buf, PAGE_SIZE, "%d\n", data->temp[attr->index] == 0);
 237 }
 238
 239 static ssize_t show_temp_max(struct device *dev, struct device_attribute
 240         *devattr, char *buf)
 241 {
 242         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 243         struct sch5627_data *data = dev_get_drvdata(dev);
 244         int val;
 245
 246         val = reg_to_temp_limit(data->temp_max[attr->index]);
 247         return snprintf(buf, PAGE_SIZE, "%d\n", val);
 248 }
 249
 250 static ssize_t show_temp_crit(struct device *dev, struct device_attribute
 251         *devattr, char *buf)
 252 {
 253         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 254         struct sch5627_data *data = dev_get_drvdata(dev);
 255         int val;
 256
 257         val = reg_to_temp_limit(data->temp_crit[attr->index]);
 258         return snprintf(buf, PAGE_SIZE, "%d\n", val);
 259 }
 260
 261 static ssize_t show_fan(struct device *dev, struct device_attribute
 262         *devattr, char *buf)
 263 {
 264         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 265         struct sch5627_data *data = sch5627_update_device(dev);
 266         int val;
 267
 268         if (IS_ERR(data))
 269                 return PTR_ERR(data);
 270
 271         val = reg_to_rpm(data->fan[attr->index]);
 272         if (val < 0)
 273                 return val;
 274
 275         return snprintf(buf, PAGE_SIZE, "%d\n", val);
 276 }
 277
 278 static ssize_t show_fan_fault(struct device *dev, struct device_attribute
 279         *devattr, char *buf)
 280 {
 281         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 282         struct sch5627_data *data = sch5627_update_device(dev);
 283
 284         if (IS_ERR(data))
 285                 return PTR_ERR(data);
 286
 287         return snprintf(buf, PAGE_SIZE, "%d\n",
 288                         data->fan[attr->index] == 0xffff);
 289 }
 290
 291 static ssize_t show_fan_min(struct device *dev, struct device_attribute
 292         *devattr, char *buf)
 293 {
 294         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 295         struct sch5627_data *data = dev_get_drvdata(dev);
 296         int val = reg_to_rpm(data->fan_min[attr->index]);
 297         if (val < 0)
 298                 return val;
 299
 300         return snprintf(buf, PAGE_SIZE, "%d\n", val);
 301 }
 302
 303 static ssize_t show_in(struct device *dev, struct device_attribute
 304         *devattr, char *buf)
 305 {
 306         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 307         struct sch5627_data *data = sch5627_update_device(dev);
 308         int val;
 309
 310         if (IS_ERR(data))
 311                 return PTR_ERR(data);
 312
 313         val = DIV_ROUND_CLOSEST(
 314                 data->in[attr->index] * SCH5627_REG_IN_FACTOR[attr->index],
 315                 10000);
 316         return snprintf(buf, PAGE_SIZE, "%d\n", val);
 317 }
 318
 319 static ssize_t show_in_label(struct device *dev, struct device_attribute
 320         *devattr, char *buf)
 321 {
 322         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 323
 324         return snprintf(buf, PAGE_SIZE, "%s\n",
 325                         SCH5627_IN_LABELS[attr->index]);
 326 }
 327
 328 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 329 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
 330 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
 331 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
 332 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
 333 static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp, NULL, 4);
 334 static SENSOR_DEVICE_ATTR(temp6_input, S_IRUGO, show_temp, NULL, 5);
 335 static SENSOR_DEVICE_ATTR(temp7_input, S_IRUGO, show_temp, NULL, 6);
 336 static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, show_temp, NULL, 7);
 337 static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_temp_fault, NULL, 0);
 338 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_temp_fault, NULL, 1);
 339 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_temp_fault, NULL, 2);
 340 static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_temp_fault, NULL, 3);
 341 static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_temp_fault, NULL, 4);
 342 static SENSOR_DEVICE_ATTR(temp6_fault, S_IRUGO, show_temp_fault, NULL, 5);
 343 static SENSOR_DEVICE_ATTR(temp7_fault, S_IRUGO, show_temp_fault, NULL, 6);
 344 static SENSOR_DEVICE_ATTR(temp8_fault, S_IRUGO, show_temp_fault, NULL, 7);
 345 static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max, NULL, 0);
 346 static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO, show_temp_max, NULL, 1);
 347 static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp_max, NULL, 2);
 348 static SENSOR_DEVICE_ATTR(temp4_max, S_IRUGO, show_temp_max, NULL, 3);
 349 static SENSOR_DEVICE_ATTR(temp5_max, S_IRUGO, show_temp_max, NULL, 4);
 350 static SENSOR_DEVICE_ATTR(temp6_max, S_IRUGO, show_temp_max, NULL, 5);
 351 static SENSOR_DEVICE_ATTR(temp7_max, S_IRUGO, show_temp_max, NULL, 6);
 352 static SENSOR_DEVICE_ATTR(temp8_max, S_IRUGO, show_temp_max, NULL, 7);
 353 static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit, NULL, 0);
 354 static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp_crit, NULL, 1);
 355 static SENSOR_DEVICE_ATTR(temp3_crit, S_IRUGO, show_temp_crit, NULL, 2);
 356 static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO, show_temp_crit, NULL, 3);
 357 static SENSOR_DEVICE_ATTR(temp5_crit, S_IRUGO, show_temp_crit, NULL, 4);
 358 static SENSOR_DEVICE_ATTR(temp6_crit, S_IRUGO, show_temp_crit, NULL, 5);
 359 static SENSOR_DEVICE_ATTR(temp7_crit, S_IRUGO, show_temp_crit, NULL, 6);
 360 static SENSOR_DEVICE_ATTR(temp8_crit, S_IRUGO, show_temp_crit, NULL, 7);
 361
 362 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
 363 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
 364 static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2);
 365 static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3);
 366 static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, show_fan_fault, NULL, 0);
 367 static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, show_fan_fault, NULL, 1);
 368 static SENSOR_DEVICE_ATTR(fan3_fault, S_IRUGO, show_fan_fault, NULL, 2);
 369 static SENSOR_DEVICE_ATTR(fan4_fault, S_IRUGO, show_fan_fault, NULL, 3);
 370 static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO, show_fan_min, NULL, 0);
 371 static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO, show_fan_min, NULL, 1);
 372 static SENSOR_DEVICE_ATTR(fan3_min, S_IRUGO, show_fan_min, NULL, 2);
 373 static SENSOR_DEVICE_ATTR(fan4_min, S_IRUGO, show_fan_min, NULL, 3);
 374
 375 static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, show_in, NULL, 0);
 376 static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_in, NULL, 1);
 377 static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_in, NULL, 2);
 378 static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_in, NULL, 3);
 379 static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_in, NULL, 4);
 380 static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_in_label, NULL, 0);
 381 static SENSOR_DEVICE_ATTR(in1_label, S_IRUGO, show_in_label, NULL, 1);
 382 static SENSOR_DEVICE_ATTR(in2_label, S_IRUGO, show_in_label, NULL, 2);
 383 static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_in_label, NULL, 3);
 384
 385 static struct attribute *sch5627_attributes[] = {
 386         &dev_attr_name.attr,
 387
 388         &sensor_dev_attr_temp1_input.dev_attr.attr,
 389         &sensor_dev_attr_temp2_input.dev_attr.attr,
 390         &sensor_dev_attr_temp3_input.dev_attr.attr,
 391         &sensor_dev_attr_temp4_input.dev_attr.attr,
 392         &sensor_dev_attr_temp5_input.dev_attr.attr,
 393         &sensor_dev_attr_temp6_input.dev_attr.attr,
 394         &sensor_dev_attr_temp7_input.dev_attr.attr,
 395         &sensor_dev_attr_temp8_input.dev_attr.attr,
 396         &sensor_dev_attr_temp1_fault.dev_attr.attr,
 397         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 398         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 399         &sensor_dev_attr_temp4_fault.dev_attr.attr,
 400         &sensor_dev_attr_temp5_fault.dev_attr.attr,
 401         &sensor_dev_attr_temp6_fault.dev_attr.attr,
 402         &sensor_dev_attr_temp7_fault.dev_attr.attr,
 403         &sensor_dev_attr_temp8_fault.dev_attr.attr,
 404         &sensor_dev_attr_temp1_max.dev_attr.attr,
 405         &sensor_dev_attr_temp2_max.dev_attr.attr,
 406         &sensor_dev_attr_temp3_max.dev_attr.attr,
 407         &sensor_dev_attr_temp4_max.dev_attr.attr,
 408         &sensor_dev_attr_temp5_max.dev_attr.attr,
 409         &sensor_dev_attr_temp6_max.dev_attr.attr,
 410         &sensor_dev_attr_temp7_max.dev_attr.attr,
 411         &sensor_dev_attr_temp8_max.dev_attr.attr,
 412         &sensor_dev_attr_temp1_crit.dev_attr.attr,
 413         &sensor_dev_attr_temp2_crit.dev_attr.attr,
 414         &sensor_dev_attr_temp3_crit.dev_attr.attr,
 415         &sensor_dev_attr_temp4_crit.dev_attr.attr,
 416         &sensor_dev_attr_temp5_crit.dev_attr.attr,
 417         &sensor_dev_attr_temp6_crit.dev_attr.attr,
 418         &sensor_dev_attr_temp7_crit.dev_attr.attr,
 419         &sensor_dev_attr_temp8_crit.dev_attr.attr,
 420
 421         &sensor_dev_attr_fan1_input.dev_attr.attr,
 422         &sensor_dev_attr_fan2_input.dev_attr.attr,
 423         &sensor_dev_attr_fan3_input.dev_attr.attr,
 424         &sensor_dev_attr_fan4_input.dev_attr.attr,
 425         &sensor_dev_attr_fan1_fault.dev_attr.attr,
 426         &sensor_dev_attr_fan2_fault.dev_attr.attr,
 427         &sensor_dev_attr_fan3_fault.dev_attr.attr,
 428         &sensor_dev_attr_fan4_fault.dev_attr.attr,
 429         &sensor_dev_attr_fan1_min.dev_attr.attr,
 430         &sensor_dev_attr_fan2_min.dev_attr.attr,
 431         &sensor_dev_attr_fan3_min.dev_attr.attr,
 432         &sensor_dev_attr_fan4_min.dev_attr.attr,
 433
 434         &sensor_dev_attr_in0_input.dev_attr.attr,
 435         &sensor_dev_attr_in1_input.dev_attr.attr,
 436         &sensor_dev_attr_in2_input.dev_attr.attr,
 437         &sensor_dev_attr_in3_input.dev_attr.attr,
 438         &sensor_dev_attr_in4_input.dev_attr.attr,
 439         &sensor_dev_attr_in0_label.dev_attr.attr,
 440         &sensor_dev_attr_in1_label.dev_attr.attr,
 441         &sensor_dev_attr_in2_label.dev_attr.attr,
 442         &sensor_dev_attr_in3_label.dev_attr.attr,
 443         /* No in4_label as in4 is a generic input pin */
 444
 445         NULL
 446 };
 447
 448 static const struct attribute_group sch5627_group = {
 449         .attrs = sch5627_attributes,
 450 };
 451
 452 static int sch5627_remove(struct platform_device *pdev)
 453 {
 454         struct sch5627_data *data = platform_get_drvdata(pdev);
 455
 456         if (data->hwmon_dev)
 457                 hwmon_device_unregister(data->hwmon_dev);
 458
 459         sysfs_remove_group(&pdev->dev.kobj, &sch5627_group);
 460         platform_set_drvdata(pdev, NULL);
 461         kfree(data);
 462
 463         return 0;
 464 }
 465
 466 static int __devinit sch5627_probe(struct platform_device *pdev)
 467 {
 468         struct sch5627_data *data;
 469         int err, build_code, build_id, hwmon_rev, val;
 470
 471         data = kzalloc(sizeof(struct sch5627_data), GFP_KERNEL);
 472         if (!data)
 473                 return -ENOMEM;
 474
 475         data->addr = platform_get_resource(pdev, IORESOURCE_IO, 0)->start;
 476         mutex_init(&data->update_lock);
 477         platform_set_drvdata(pdev, data);
 478
 479         val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_HWMON_ID);
 480         if (val < 0) {
 481                 err = val;
 482                 goto error;
 483         }
 484         if (val != SCH5627_HWMON_ID) {
 485                 pr_err("invalid %s id: 0x%02X (expected 0x%02X)\n", "hwmon",
 486                        val, SCH5627_HWMON_ID);
 487                 err = -ENODEV;
 488                 goto error;
 489         }
 490
 491         val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_COMPANY_ID);
 492         if (val < 0) {
 493                 err = val;
 494                 goto error;
 495         }
 496         if (val != SCH5627_COMPANY_ID) {
 497                 pr_err("invalid %s id: 0x%02X (expected 0x%02X)\n", "company",
 498                        val, SCH5627_COMPANY_ID);
 499                 err = -ENODEV;
 500                 goto error;
 501         }
 502
 503         val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_PRIMARY_ID);
 504         if (val < 0) {
 505                 err = val;
 506                 goto error;
 507         }
 508         if (val != SCH5627_PRIMARY_ID) {
 509                 pr_err("invalid %s id: 0x%02X (expected 0x%02X)\n", "primary",
 510                        val, SCH5627_PRIMARY_ID);
 511                 err = -ENODEV;
 512                 goto error;
 513         }
 514
 515         build_code = sch56xx_read_virtual_reg(data->addr,
 516                                               SCH5627_REG_BUILD_CODE);
 517         if (build_code < 0) {
 518                 err = build_code;
 519                 goto error;
 520         }
 521
 522         build_id = sch56xx_read_virtual_reg16(data->addr,
 523                                               SCH5627_REG_BUILD_ID);
 524         if (build_id < 0) {
 525                 err = build_id;
 526                 goto error;
 527         }
 528
 529         hwmon_rev = sch56xx_read_virtual_reg(data->addr,
 530                                              SCH5627_REG_HWMON_REV);
 531         if (hwmon_rev < 0) {
 532                 err = hwmon_rev;
 533                 goto error;
 534         }
 535
 536         val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_CTRL);
 537         if (val < 0) {
 538                 err = val;
 539                 goto error;
 540         }
 541         data->control = val;
 542         if (!(data->control & 0x01)) {
 543                 pr_err("hardware monitoring not enabled\n");
 544                 err = -ENODEV;
 545                 goto error;
 546         }
 547         /* Trigger a Vbat voltage measurement, so that we get a valid reading
 548            the first time we read Vbat */
 549         sch56xx_write_virtual_reg(data->addr, SCH5627_REG_CTRL,
 550                                   data->control | 0x10);
 551         data->last_battery = jiffies;
 552
 553         /*
 554          * Read limits, we do this only once as reading a register on
 555          * the sch5627 is quite expensive (and they don't change).
 556          */
 557         err = sch5627_read_limits(data);
 558         if (err)
 559                 goto error;
 560
 561         pr_info("found %s chip at %#hx\n", DEVNAME, data->addr);
 562         pr_info("firmware build: code 0x%02X, id 0x%04X, hwmon: rev 0x%02X\n",
 563                 build_code, build_id, hwmon_rev);
 564
 565         /* Register sysfs interface files */
 566         err = sysfs_create_group(&pdev->dev.kobj, &sch5627_group);
 567         if (err)
 568                 goto error;
 569
 570         data->hwmon_dev = hwmon_device_register(&pdev->dev);
 571         if (IS_ERR(data->hwmon_dev)) {
 572                 err = PTR_ERR(data->hwmon_dev);
 573                 data->hwmon_dev = NULL;
 574                 goto error;
 575         }
 576
 577         return 0;
 578
 579 error:
 580         sch5627_remove(pdev);
 581         return err;
 582 }
 583
 584 static struct platform_driver sch5627_driver = {
 585         .driver = {
 586                 .owner  = THIS_MODULE,
 587                 .name   = DRVNAME,
 588         },
 589         .probe          = sch5627_probe,
 590         .remove         = sch5627_remove,
 591 };
 592
 593 static int __init sch5627_init(void)
 594 {
 595         return platform_driver_register(&sch5627_driver);
 596 }
 597
 598 static void __exit sch5627_exit(void)
 599 {
 600         platform_driver_unregister(&sch5627_driver);
 601 }
 602
 603 MODULE_DESCRIPTION("SMSC SCH5627 Hardware Monitoring Driver");
 604 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
 605 MODULE_LICENSE("GPL");
 606
 607 module_init(sch5627_init);
 608 module_exit(sch5627_exit);