drivers/hwmon/sch5627.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /***************************************************************************
   3  *   Copyright (C) 2010-2012 Hans de Goede <hdegoede@redhat.com>           *
   4  *                                                                         *
   5  ***************************************************************************/
   6
   7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   8
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/slab.h>
  12 #include <linux/jiffies.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/hwmon.h>
  15 #include <linux/hwmon-sysfs.h>
  16 #include <linux/err.h>
  17 #include <linux/mutex.h>
  18 #include "sch56xx-common.h"
  19
  20 #define DRVNAME "sch5627"
  21 #define DEVNAME DRVNAME /* We only support one model */
  22
  23 #define SCH5627_HWMON_ID                0xa5
  24 #define SCH5627_COMPANY_ID              0x5c
  25 #define SCH5627_PRIMARY_ID              0xa0
  26
  27 #define SCH5627_REG_BUILD_CODE          0x39
  28 #define SCH5627_REG_BUILD_ID            0x3a
  29 #define SCH5627_REG_HWMON_ID            0x3c
  30 #define SCH5627_REG_HWMON_REV           0x3d
  31 #define SCH5627_REG_COMPANY_ID          0x3e
  32 #define SCH5627_REG_PRIMARY_ID          0x3f
  33 #define SCH5627_REG_CTRL                0x40
  34
  35 #define SCH5627_NO_TEMPS                8
  36 #define SCH5627_NO_FANS                 4
  37 #define SCH5627_NO_IN                   5
  38
  39 static const u16 SCH5627_REG_TEMP_MSB[SCH5627_NO_TEMPS] = {
  40         0x2B, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x180, 0x181 };
  41 static const u16 SCH5627_REG_TEMP_LSN[SCH5627_NO_TEMPS] = {
  42         0xE2, 0xE1, 0xE1, 0xE5, 0xE5, 0xE6, 0x182, 0x182 };
  43 static const u16 SCH5627_REG_TEMP_HIGH_NIBBLE[SCH5627_NO_TEMPS] = {
  44         0, 0, 1, 1, 0, 0, 0, 1 };
  45 static const u16 SCH5627_REG_TEMP_HIGH[SCH5627_NO_TEMPS] = {
  46         0x61, 0x57, 0x59, 0x5B, 0x5D, 0x5F, 0x184, 0x186 };
  47 static const u16 SCH5627_REG_TEMP_ABS[SCH5627_NO_TEMPS] = {
  48         0x9B, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x1A8, 0x1A9 };
  49
  50 static const u16 SCH5627_REG_FAN[SCH5627_NO_FANS] = {
  51         0x2C, 0x2E, 0x30, 0x32 };
  52 static const u16 SCH5627_REG_FAN_MIN[SCH5627_NO_FANS] = {
  53         0x62, 0x64, 0x66, 0x68 };
  54
  55 static const u16 SCH5627_REG_IN_MSB[SCH5627_NO_IN] = {
  56         0x22, 0x23, 0x24, 0x25, 0x189 };
  57 static const u16 SCH5627_REG_IN_LSN[SCH5627_NO_IN] = {
  58         0xE4, 0xE4, 0xE3, 0xE3, 0x18A };
  59 static const u16 SCH5627_REG_IN_HIGH_NIBBLE[SCH5627_NO_IN] = {
  60         1, 0, 1, 0, 1 };
  61 static const u16 SCH5627_REG_IN_FACTOR[SCH5627_NO_IN] = {
  62         10745, 3660, 9765, 10745, 3660 };
  63 static const char * const SCH5627_IN_LABELS[SCH5627_NO_IN] = {
  64         "VCC", "VTT", "VBAT", "VTR", "V_IN" };
  65
  66 struct sch5627_data {
  67         unsigned short addr;
  68         struct device *hwmon_dev;
  69         struct sch56xx_watchdog_data *watchdog;
  70         u8 control;
  71         u8 temp_max[SCH5627_NO_TEMPS];
  72         u8 temp_crit[SCH5627_NO_TEMPS];
  73         u16 fan_min[SCH5627_NO_FANS];
  74
  75         struct mutex update_lock;
  76         unsigned long last_battery;     /* In jiffies */
  77         char valid;                     /* !=0 if following fields are valid */
  78         unsigned long last_updated;     /* In jiffies */
  79         u16 temp[SCH5627_NO_TEMPS];
  80         u16 fan[SCH5627_NO_FANS];
  81         u16 in[SCH5627_NO_IN];
  82 };
  83
  84 static struct sch5627_data *sch5627_update_device(struct device *dev)
  85 {
  86         struct sch5627_data *data = dev_get_drvdata(dev);
  87         struct sch5627_data *ret = data;
  88         int i, val;
  89
  90         mutex_lock(&data->update_lock);
  91
  92         /* Trigger a Vbat voltage measurement every 5 minutes */
  93         if (time_after(jiffies, data->last_battery + 300 * HZ)) {
  94                 sch56xx_write_virtual_reg(data->addr, SCH5627_REG_CTRL,
  95                                           data->control | 0x10);
  96                 data->last_battery = jiffies;
  97         }
  98
  99         /* Cache the values for 1 second */
 100         if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 101                 for (i = 0; i < SCH5627_NO_TEMPS; i++) {
 102                         val = sch56xx_read_virtual_reg12(data->addr,
 103                                 SCH5627_REG_TEMP_MSB[i],
 104                                 SCH5627_REG_TEMP_LSN[i],
 105                                 SCH5627_REG_TEMP_HIGH_NIBBLE[i]);
 106                         if (unlikely(val < 0)) {
 107                                 ret = ERR_PTR(val);
 108                                 goto abort;
 109                         }
 110                         data->temp[i] = val;
 111                 }
 112
 113                 for (i = 0; i < SCH5627_NO_FANS; i++) {
 114                         val = sch56xx_read_virtual_reg16(data->addr,
 115                                                          SCH5627_REG_FAN[i]);
 116                         if (unlikely(val < 0)) {
 117                                 ret = ERR_PTR(val);
 118                                 goto abort;
 119                         }
 120                         data->fan[i] = val;
 121                 }
 122
 123                 for (i = 0; i < SCH5627_NO_IN; i++) {
 124                         val = sch56xx_read_virtual_reg12(data->addr,
 125                                 SCH5627_REG_IN_MSB[i],
 126                                 SCH5627_REG_IN_LSN[i],
 127                                 SCH5627_REG_IN_HIGH_NIBBLE[i]);
 128                         if (unlikely(val < 0)) {
 129                                 ret = ERR_PTR(val);
 130                                 goto abort;
 131                         }
 132                         data->in[i] = val;
 133                 }
 134
 135                 data->last_updated = jiffies;
 136                 data->valid = 1;
 137         }
 138 abort:
 139         mutex_unlock(&data->update_lock);
 140         return ret;
 141 }
 142
 143 static int sch5627_read_limits(struct sch5627_data *data)
 144 {
 145         int i, val;
 146
 147         for (i = 0; i < SCH5627_NO_TEMPS; i++) {
 148                 /*
 149                  * Note what SMSC calls ABS, is what lm_sensors calls max
 150                  * (aka high), and HIGH is what lm_sensors calls crit.
 151                  */
 152                 val = sch56xx_read_virtual_reg(data->addr,
 153                                                SCH5627_REG_TEMP_ABS[i]);
 154                 if (val < 0)
 155                         return val;
 156                 data->temp_max[i] = val;
 157
 158                 val = sch56xx_read_virtual_reg(data->addr,
 159                                                SCH5627_REG_TEMP_HIGH[i]);
 160                 if (val < 0)
 161                         return val;
 162                 data->temp_crit[i] = val;
 163         }
 164         for (i = 0; i < SCH5627_NO_FANS; i++) {
 165                 val = sch56xx_read_virtual_reg16(data->addr,
 166                                                  SCH5627_REG_FAN_MIN[i]);
 167                 if (val < 0)
 168                         return val;
 169                 data->fan_min[i] = val;
 170         }
 171
 172         return 0;
 173 }
 174
 175 static int reg_to_temp(u16 reg)
 176 {
 177         return (reg * 625) / 10 - 64000;
 178 }
 179
 180 static int reg_to_temp_limit(u8 reg)
 181 {
 182         return (reg - 64) * 1000;
 183 }
 184
 185 static int reg_to_rpm(u16 reg)
 186 {
 187         if (reg == 0)
 188                 return -EIO;
 189         if (reg == 0xffff)
 190                 return 0;
 191
 192         return 5400540 / reg;
 193 }
 194
 195 static ssize_t name_show(struct device *dev, struct device_attribute *devattr,
 196         char *buf)
 197 {
 198         return snprintf(buf, PAGE_SIZE, "%s\n", DEVNAME);
 199 }
 200
 201 static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
 202                          char *buf)
 203 {
 204         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 205         struct sch5627_data *data = sch5627_update_device(dev);
 206         int val;
 207
 208         if (IS_ERR(data))
 209                 return PTR_ERR(data);
 210
 211         val = reg_to_temp(data->temp[attr->index]);
 212         return snprintf(buf, PAGE_SIZE, "%d\n", val);
 213 }
 214
 215 static ssize_t temp_fault_show(struct device *dev,
 216                                struct device_attribute *devattr, char *buf)
 217 {
 218         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 219         struct sch5627_data *data = sch5627_update_device(dev);
 220
 221         if (IS_ERR(data))
 222                 return PTR_ERR(data);
 223
 224         return snprintf(buf, PAGE_SIZE, "%d\n", data->temp[attr->index] == 0);
 225 }
 226
 227 static ssize_t temp_max_show(struct device *dev,
 228                              struct device_attribute *devattr, char *buf)
 229 {
 230         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 231         struct sch5627_data *data = dev_get_drvdata(dev);
 232         int val;
 233
 234         val = reg_to_temp_limit(data->temp_max[attr->index]);
 235         return snprintf(buf, PAGE_SIZE, "%d\n", val);
 236 }
 237
 238 static ssize_t temp_crit_show(struct device *dev,
 239                               struct device_attribute *devattr, char *buf)
 240 {
 241         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 242         struct sch5627_data *data = dev_get_drvdata(dev);
 243         int val;
 244
 245         val = reg_to_temp_limit(data->temp_crit[attr->index]);
 246         return snprintf(buf, PAGE_SIZE, "%d\n", val);
 247 }
 248
 249 static ssize_t fan_show(struct device *dev, struct device_attribute *devattr,
 250                         char *buf)
 251 {
 252         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 253         struct sch5627_data *data = sch5627_update_device(dev);
 254         int val;
 255
 256         if (IS_ERR(data))
 257                 return PTR_ERR(data);
 258
 259         val = reg_to_rpm(data->fan[attr->index]);
 260         if (val < 0)
 261                 return val;
 262
 263         return snprintf(buf, PAGE_SIZE, "%d\n", val);
 264 }
 265
 266 static ssize_t fan_fault_show(struct device *dev,
 267                               struct device_attribute *devattr, char *buf)
 268 {
 269         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 270         struct sch5627_data *data = sch5627_update_device(dev);
 271
 272         if (IS_ERR(data))
 273                 return PTR_ERR(data);
 274
 275         return snprintf(buf, PAGE_SIZE, "%d\n",
 276                         data->fan[attr->index] == 0xffff);
 277 }
 278
 279 static ssize_t fan_min_show(struct device *dev,
 280                             struct device_attribute *devattr, char *buf)
 281 {
 282         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 283         struct sch5627_data *data = dev_get_drvdata(dev);
 284         int val = reg_to_rpm(data->fan_min[attr->index]);
 285         if (val < 0)
 286                 return val;
 287
 288         return snprintf(buf, PAGE_SIZE, "%d\n", val);
 289 }
 290
 291 static ssize_t in_show(struct device *dev, struct device_attribute *devattr,
 292                        char *buf)
 293 {
 294         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 295         struct sch5627_data *data = sch5627_update_device(dev);
 296         int val;
 297
 298         if (IS_ERR(data))
 299                 return PTR_ERR(data);
 300
 301         val = DIV_ROUND_CLOSEST(
 302                 data->in[attr->index] * SCH5627_REG_IN_FACTOR[attr->index],
 303                 10000);
 304         return snprintf(buf, PAGE_SIZE, "%d\n", val);
 305 }
 306
 307 static ssize_t in_label_show(struct device *dev,
 308                              struct device_attribute *devattr, char *buf)
 309 {
 310         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 311
 312         return snprintf(buf, PAGE_SIZE, "%s\n",
 313                         SCH5627_IN_LABELS[attr->index]);
 314 }
 315
 316 static DEVICE_ATTR_RO(name);
 317 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
 318 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
 319 static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
 320 static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 3);
 321 static SENSOR_DEVICE_ATTR_RO(temp5_input, temp, 4);
 322 static SENSOR_DEVICE_ATTR_RO(temp6_input, temp, 5);
 323 static SENSOR_DEVICE_ATTR_RO(temp7_input, temp, 6);
 324 static SENSOR_DEVICE_ATTR_RO(temp8_input, temp, 7);
 325 static SENSOR_DEVICE_ATTR_RO(temp1_fault, temp_fault, 0);
 326 static SENSOR_DEVICE_ATTR_RO(temp2_fault, temp_fault, 1);
 327 static SENSOR_DEVICE_ATTR_RO(temp3_fault, temp_fault, 2);
 328 static SENSOR_DEVICE_ATTR_RO(temp4_fault, temp_fault, 3);
 329 static SENSOR_DEVICE_ATTR_RO(temp5_fault, temp_fault, 4);
 330 static SENSOR_DEVICE_ATTR_RO(temp6_fault, temp_fault, 5);
 331 static SENSOR_DEVICE_ATTR_RO(temp7_fault, temp_fault, 6);
 332 static SENSOR_DEVICE_ATTR_RO(temp8_fault, temp_fault, 7);
 333 static SENSOR_DEVICE_ATTR_RO(temp1_max, temp_max, 0);
 334 static SENSOR_DEVICE_ATTR_RO(temp2_max, temp_max, 1);
 335 static SENSOR_DEVICE_ATTR_RO(temp3_max, temp_max, 2);
 336 static SENSOR_DEVICE_ATTR_RO(temp4_max, temp_max, 3);
 337 static SENSOR_DEVICE_ATTR_RO(temp5_max, temp_max, 4);
 338 static SENSOR_DEVICE_ATTR_RO(temp6_max, temp_max, 5);
 339 static SENSOR_DEVICE_ATTR_RO(temp7_max, temp_max, 6);
 340 static SENSOR_DEVICE_ATTR_RO(temp8_max, temp_max, 7);
 341 static SENSOR_DEVICE_ATTR_RO(temp1_crit, temp_crit, 0);
 342 static SENSOR_DEVICE_ATTR_RO(temp2_crit, temp_crit, 1);
 343 static SENSOR_DEVICE_ATTR_RO(temp3_crit, temp_crit, 2);
 344 static SENSOR_DEVICE_ATTR_RO(temp4_crit, temp_crit, 3);
 345 static SENSOR_DEVICE_ATTR_RO(temp5_crit, temp_crit, 4);
 346 static SENSOR_DEVICE_ATTR_RO(temp6_crit, temp_crit, 5);
 347 static SENSOR_DEVICE_ATTR_RO(temp7_crit, temp_crit, 6);
 348 static SENSOR_DEVICE_ATTR_RO(temp8_crit, temp_crit, 7);
 349
 350 static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);
 351 static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);
 352 static SENSOR_DEVICE_ATTR_RO(fan3_input, fan, 2);
 353 static SENSOR_DEVICE_ATTR_RO(fan4_input, fan, 3);
 354 static SENSOR_DEVICE_ATTR_RO(fan1_fault, fan_fault, 0);
 355 static SENSOR_DEVICE_ATTR_RO(fan2_fault, fan_fault, 1);
 356 static SENSOR_DEVICE_ATTR_RO(fan3_fault, fan_fault, 2);
 357 static SENSOR_DEVICE_ATTR_RO(fan4_fault, fan_fault, 3);
 358 static SENSOR_DEVICE_ATTR_RO(fan1_min, fan_min, 0);
 359 static SENSOR_DEVICE_ATTR_RO(fan2_min, fan_min, 1);
 360 static SENSOR_DEVICE_ATTR_RO(fan3_min, fan_min, 2);
 361 static SENSOR_DEVICE_ATTR_RO(fan4_min, fan_min, 3);
 362
 363 static SENSOR_DEVICE_ATTR_RO(in0_input, in, 0);
 364 static SENSOR_DEVICE_ATTR_RO(in1_input, in, 1);
 365 static SENSOR_DEVICE_ATTR_RO(in2_input, in, 2);
 366 static SENSOR_DEVICE_ATTR_RO(in3_input, in, 3);
 367 static SENSOR_DEVICE_ATTR_RO(in4_input, in, 4);
 368 static SENSOR_DEVICE_ATTR_RO(in0_label, in_label, 0);
 369 static SENSOR_DEVICE_ATTR_RO(in1_label, in_label, 1);
 370 static SENSOR_DEVICE_ATTR_RO(in2_label, in_label, 2);
 371 static SENSOR_DEVICE_ATTR_RO(in3_label, in_label, 3);
 372
 373 static struct attribute *sch5627_attributes[] = {
 374         &dev_attr_name.attr,
 375
 376         &sensor_dev_attr_temp1_input.dev_attr.attr,
 377         &sensor_dev_attr_temp2_input.dev_attr.attr,
 378         &sensor_dev_attr_temp3_input.dev_attr.attr,
 379         &sensor_dev_attr_temp4_input.dev_attr.attr,
 380         &sensor_dev_attr_temp5_input.dev_attr.attr,
 381         &sensor_dev_attr_temp6_input.dev_attr.attr,
 382         &sensor_dev_attr_temp7_input.dev_attr.attr,
 383         &sensor_dev_attr_temp8_input.dev_attr.attr,
 384         &sensor_dev_attr_temp1_fault.dev_attr.attr,
 385         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 386         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 387         &sensor_dev_attr_temp4_fault.dev_attr.attr,
 388         &sensor_dev_attr_temp5_fault.dev_attr.attr,
 389         &sensor_dev_attr_temp6_fault.dev_attr.attr,
 390         &sensor_dev_attr_temp7_fault.dev_attr.attr,
 391         &sensor_dev_attr_temp8_fault.dev_attr.attr,
 392         &sensor_dev_attr_temp1_max.dev_attr.attr,
 393         &sensor_dev_attr_temp2_max.dev_attr.attr,
 394         &sensor_dev_attr_temp3_max.dev_attr.attr,
 395         &sensor_dev_attr_temp4_max.dev_attr.attr,
 396         &sensor_dev_attr_temp5_max.dev_attr.attr,
 397         &sensor_dev_attr_temp6_max.dev_attr.attr,
 398         &sensor_dev_attr_temp7_max.dev_attr.attr,
 399         &sensor_dev_attr_temp8_max.dev_attr.attr,
 400         &sensor_dev_attr_temp1_crit.dev_attr.attr,
 401         &sensor_dev_attr_temp2_crit.dev_attr.attr,
 402         &sensor_dev_attr_temp3_crit.dev_attr.attr,
 403         &sensor_dev_attr_temp4_crit.dev_attr.attr,
 404         &sensor_dev_attr_temp5_crit.dev_attr.attr,
 405         &sensor_dev_attr_temp6_crit.dev_attr.attr,
 406         &sensor_dev_attr_temp7_crit.dev_attr.attr,
 407         &sensor_dev_attr_temp8_crit.dev_attr.attr,
 408
 409         &sensor_dev_attr_fan1_input.dev_attr.attr,
 410         &sensor_dev_attr_fan2_input.dev_attr.attr,
 411         &sensor_dev_attr_fan3_input.dev_attr.attr,
 412         &sensor_dev_attr_fan4_input.dev_attr.attr,
 413         &sensor_dev_attr_fan1_fault.dev_attr.attr,
 414         &sensor_dev_attr_fan2_fault.dev_attr.attr,
 415         &sensor_dev_attr_fan3_fault.dev_attr.attr,
 416         &sensor_dev_attr_fan4_fault.dev_attr.attr,
 417         &sensor_dev_attr_fan1_min.dev_attr.attr,
 418         &sensor_dev_attr_fan2_min.dev_attr.attr,
 419         &sensor_dev_attr_fan3_min.dev_attr.attr,
 420         &sensor_dev_attr_fan4_min.dev_attr.attr,
 421
 422         &sensor_dev_attr_in0_input.dev_attr.attr,
 423         &sensor_dev_attr_in1_input.dev_attr.attr,
 424         &sensor_dev_attr_in2_input.dev_attr.attr,
 425         &sensor_dev_attr_in3_input.dev_attr.attr,
 426         &sensor_dev_attr_in4_input.dev_attr.attr,
 427         &sensor_dev_attr_in0_label.dev_attr.attr,
 428         &sensor_dev_attr_in1_label.dev_attr.attr,
 429         &sensor_dev_attr_in2_label.dev_attr.attr,
 430         &sensor_dev_attr_in3_label.dev_attr.attr,
 431         /* No in4_label as in4 is a generic input pin */
 432
 433         NULL
 434 };
 435
 436 static const struct attribute_group sch5627_group = {
 437         .attrs = sch5627_attributes,
 438 };
 439
 440 static int sch5627_remove(struct platform_device *pdev)
 441 {
 442         struct sch5627_data *data = platform_get_drvdata(pdev);
 443
 444         if (data->watchdog)
 445                 sch56xx_watchdog_unregister(data->watchdog);
 446
 447         if (data->hwmon_dev)
 448                 hwmon_device_unregister(data->hwmon_dev);
 449
 450         sysfs_remove_group(&pdev->dev.kobj, &sch5627_group);
 451
 452         return 0;
 453 }
 454
 455 static int sch5627_probe(struct platform_device *pdev)
 456 {
 457         struct sch5627_data *data;
 458         int err, build_code, build_id, hwmon_rev, val;
 459
 460         data = devm_kzalloc(&pdev->dev, sizeof(struct sch5627_data),
 461                             GFP_KERNEL);
 462         if (!data)
 463                 return -ENOMEM;
 464
 465         data->addr = platform_get_resource(pdev, IORESOURCE_IO, 0)->start;
 466         mutex_init(&data->update_lock);
 467         platform_set_drvdata(pdev, data);
 468
 469         val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_HWMON_ID);
 470         if (val < 0) {
 471                 err = val;
 472                 goto error;
 473         }
 474         if (val != SCH5627_HWMON_ID) {
 475                 pr_err("invalid %s id: 0x%02X (expected 0x%02X)\n", "hwmon",
 476                        val, SCH5627_HWMON_ID);
 477                 err = -ENODEV;
 478                 goto error;
 479         }
 480
 481         val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_COMPANY_ID);
 482         if (val < 0) {
 483                 err = val;
 484                 goto error;
 485         }
 486         if (val != SCH5627_COMPANY_ID) {
 487                 pr_err("invalid %s id: 0x%02X (expected 0x%02X)\n", "company",
 488                        val, SCH5627_COMPANY_ID);
 489                 err = -ENODEV;
 490                 goto error;
 491         }
 492
 493         val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_PRIMARY_ID);
 494         if (val < 0) {
 495                 err = val;
 496                 goto error;
 497         }
 498         if (val != SCH5627_PRIMARY_ID) {
 499                 pr_err("invalid %s id: 0x%02X (expected 0x%02X)\n", "primary",
 500                        val, SCH5627_PRIMARY_ID);
 501                 err = -ENODEV;
 502                 goto error;
 503         }
 504
 505         build_code = sch56xx_read_virtual_reg(data->addr,
 506                                               SCH5627_REG_BUILD_CODE);
 507         if (build_code < 0) {
 508                 err = build_code;
 509                 goto error;
 510         }
 511
 512         build_id = sch56xx_read_virtual_reg16(data->addr,
 513                                               SCH5627_REG_BUILD_ID);
 514         if (build_id < 0) {
 515                 err = build_id;
 516                 goto error;
 517         }
 518
 519         hwmon_rev = sch56xx_read_virtual_reg(data->addr,
 520                                              SCH5627_REG_HWMON_REV);
 521         if (hwmon_rev < 0) {
 522                 err = hwmon_rev;
 523                 goto error;
 524         }
 525
 526         val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_CTRL);
 527         if (val < 0) {
 528                 err = val;
 529                 goto error;
 530         }
 531         data->control = val;
 532         if (!(data->control & 0x01)) {
 533                 pr_err("hardware monitoring not enabled\n");
 534                 err = -ENODEV;
 535                 goto error;
 536         }
 537         /* Trigger a Vbat voltage measurement, so that we get a valid reading
 538            the first time we read Vbat */
 539         sch56xx_write_virtual_reg(data->addr, SCH5627_REG_CTRL,
 540                                   data->control | 0x10);
 541         data->last_battery = jiffies;
 542
 543         /*
 544          * Read limits, we do this only once as reading a register on
 545          * the sch5627 is quite expensive (and they don't change).
 546          */
 547         err = sch5627_read_limits(data);
 548         if (err)
 549                 goto error;
 550
 551         pr_info("found %s chip at %#hx\n", DEVNAME, data->addr);
 552         pr_info("firmware build: code 0x%02X, id 0x%04X, hwmon: rev 0x%02X\n",
 553                 build_code, build_id, hwmon_rev);
 554
 555         /* Register sysfs interface files */
 556         err = sysfs_create_group(&pdev->dev.kobj, &sch5627_group);
 557         if (err)
 558                 goto error;
 559
 560         data->hwmon_dev = hwmon_device_register(&pdev->dev);
 561         if (IS_ERR(data->hwmon_dev)) {
 562                 err = PTR_ERR(data->hwmon_dev);
 563                 data->hwmon_dev = NULL;
 564                 goto error;
 565         }
 566
 567         /* Note failing to register the watchdog is not a fatal error */
 568         data->watchdog = sch56xx_watchdog_register(&pdev->dev, data->addr,
 569                         (build_code << 24) | (build_id << 8) | hwmon_rev,
 570                         &data->update_lock, 1);
 571
 572         return 0;
 573
 574 error:
 575         sch5627_remove(pdev);
 576         return err;
 577 }
 578
 579 static struct platform_driver sch5627_driver = {
 580         .driver = {
 581                 .name   = DRVNAME,
 582         },
 583         .probe          = sch5627_probe,
 584         .remove         = sch5627_remove,
 585 };
 586
 587 module_platform_driver(sch5627_driver);
 588
 589 MODULE_DESCRIPTION("SMSC SCH5627 Hardware Monitoring Driver");
 590 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
 591 MODULE_LICENSE("GPL");