linux/drivers/hwmon/sch5627.c
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   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
  52static const u16 SCH5627_REG_TEMP_MSB[SCH5627_NO_TEMPS] = {
  53        0x2B, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x180, 0x181 };
  54static const u16 SCH5627_REG_TEMP_LSN[SCH5627_NO_TEMPS] = {
  55        0xE2, 0xE1, 0xE1, 0xE5, 0xE5, 0xE6, 0x182, 0x182 };
  56static const u16 SCH5627_REG_TEMP_HIGH_NIBBLE[SCH5627_NO_TEMPS] = {
  57        0, 0, 1, 1, 0, 0, 0, 1 };
  58static const u16 SCH5627_REG_TEMP_HIGH[SCH5627_NO_TEMPS] = {
  59        0x61, 0x57, 0x59, 0x5B, 0x5D, 0x5F, 0x184, 0x186 };
  60static const u16 SCH5627_REG_TEMP_ABS[SCH5627_NO_TEMPS] = {
  61        0x9B, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x1A8, 0x1A9 };
  62
  63static const u16 SCH5627_REG_FAN[SCH5627_NO_FANS] = {
  64        0x2C, 0x2E, 0x30, 0x32 };
  65static const u16 SCH5627_REG_FAN_MIN[SCH5627_NO_FANS] = {
  66        0x62, 0x64, 0x66, 0x68 };
  67
  68static const u16 SCH5627_REG_IN_MSB[SCH5627_NO_IN] = {
  69        0x22, 0x23, 0x24, 0x25, 0x189 };
  70static const u16 SCH5627_REG_IN_LSN[SCH5627_NO_IN] = {
  71        0xE4, 0xE4, 0xE3, 0xE3, 0x18A };
  72static const u16 SCH5627_REG_IN_HIGH_NIBBLE[SCH5627_NO_IN] = {
  73        1, 0, 1, 0, 1 };
  74static const u16 SCH5627_REG_IN_FACTOR[SCH5627_NO_IN] = {
  75        10745, 3660, 9765, 10745, 3660 };
  76static const char * const SCH5627_IN_LABELS[SCH5627_NO_IN] = {
  77        "VCC", "VTT", "VBAT", "VTR", "V_IN" };
  78
  79struct 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
  97static 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        }
 151abort:
 152        mutex_unlock(&data->update_lock);
 153        return ret;
 154}
 155
 156static int __devinit 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
 188static int reg_to_temp(u16 reg)
 189{
 190        return (reg * 625) / 10 - 64000;
 191}
 192
 193static int reg_to_temp_limit(u8 reg)
 194{
 195        return (reg - 64) * 1000;
 196}
 197
 198static 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
 208static 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
 214static 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
 228static 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
 240static 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
 251static 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
 262static 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
 279static 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
 292static 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
 304static 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
 320static 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
 329static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 330static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
 331static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
 332static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
 333static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
 334static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp, NULL, 4);
 335static SENSOR_DEVICE_ATTR(temp6_input, S_IRUGO, show_temp, NULL, 5);
 336static SENSOR_DEVICE_ATTR(temp7_input, S_IRUGO, show_temp, NULL, 6);
 337static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, show_temp, NULL, 7);
 338static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_temp_fault, NULL, 0);
 339static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_temp_fault, NULL, 1);
 340static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_temp_fault, NULL, 2);
 341static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_temp_fault, NULL, 3);
 342static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_temp_fault, NULL, 4);
 343static SENSOR_DEVICE_ATTR(temp6_fault, S_IRUGO, show_temp_fault, NULL, 5);
 344static SENSOR_DEVICE_ATTR(temp7_fault, S_IRUGO, show_temp_fault, NULL, 6);
 345static SENSOR_DEVICE_ATTR(temp8_fault, S_IRUGO, show_temp_fault, NULL, 7);
 346static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max, NULL, 0);
 347static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO, show_temp_max, NULL, 1);
 348static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp_max, NULL, 2);
 349static SENSOR_DEVICE_ATTR(temp4_max, S_IRUGO, show_temp_max, NULL, 3);
 350static SENSOR_DEVICE_ATTR(temp5_max, S_IRUGO, show_temp_max, NULL, 4);
 351static SENSOR_DEVICE_ATTR(temp6_max, S_IRUGO, show_temp_max, NULL, 5);
 352static SENSOR_DEVICE_ATTR(temp7_max, S_IRUGO, show_temp_max, NULL, 6);
 353static SENSOR_DEVICE_ATTR(temp8_max, S_IRUGO, show_temp_max, NULL, 7);
 354static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit, NULL, 0);
 355static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp_crit, NULL, 1);
 356static SENSOR_DEVICE_ATTR(temp3_crit, S_IRUGO, show_temp_crit, NULL, 2);
 357static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO, show_temp_crit, NULL, 3);
 358static SENSOR_DEVICE_ATTR(temp5_crit, S_IRUGO, show_temp_crit, NULL, 4);
 359static SENSOR_DEVICE_ATTR(temp6_crit, S_IRUGO, show_temp_crit, NULL, 5);
 360static SENSOR_DEVICE_ATTR(temp7_crit, S_IRUGO, show_temp_crit, NULL, 6);
 361static SENSOR_DEVICE_ATTR(temp8_crit, S_IRUGO, show_temp_crit, NULL, 7);
 362
 363static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
 364static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
 365static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2);
 366static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3);
 367static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, show_fan_fault, NULL, 0);
 368static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, show_fan_fault, NULL, 1);
 369static SENSOR_DEVICE_ATTR(fan3_fault, S_IRUGO, show_fan_fault, NULL, 2);
 370static SENSOR_DEVICE_ATTR(fan4_fault, S_IRUGO, show_fan_fault, NULL, 3);
 371static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO, show_fan_min, NULL, 0);
 372static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO, show_fan_min, NULL, 1);
 373static SENSOR_DEVICE_ATTR(fan3_min, S_IRUGO, show_fan_min, NULL, 2);
 374static SENSOR_DEVICE_ATTR(fan4_min, S_IRUGO, show_fan_min, NULL, 3);
 375
 376static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, show_in, NULL, 0);
 377static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_in, NULL, 1);
 378static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_in, NULL, 2);
 379static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_in, NULL, 3);
 380static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_in, NULL, 4);
 381static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_in_label, NULL, 0);
 382static SENSOR_DEVICE_ATTR(in1_label, S_IRUGO, show_in_label, NULL, 1);
 383static SENSOR_DEVICE_ATTR(in2_label, S_IRUGO, show_in_label, NULL, 2);
 384static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_in_label, NULL, 3);
 385
 386static 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
 449static const struct attribute_group sch5627_group = {
 450        .attrs = sch5627_attributes,
 451};
 452
 453static 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
 468static int __devinit 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
 587error:
 588        sch5627_remove(pdev);
 589        return err;
 590}
 591
 592static 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
 601module_platform_driver(sch5627_driver);
 602
 603MODULE_DESCRIPTION("SMSC SCH5627 Hardware Monitoring Driver");
 604MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
 605MODULE_LICENSE("GPL");
 606
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