drivers/hwmon/sch5636.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /***************************************************************************
   3  *   Copyright (C) 2011-2012 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/mod_devicetable.h>
  11 #include <linux/init.h>
  12 #include <linux/slab.h>
  13 #include <linux/jiffies.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/hwmon.h>
  16 #include <linux/hwmon-sysfs.h>
  17 #include <linux/err.h>
  18 #include <linux/mutex.h>
  19 #include "sch56xx-common.h"
  20
  21 #define DRVNAME "sch5636"
  22 #define DEVNAME "theseus" /* We only support one model for now */
  23
  24 #define SCH5636_REG_FUJITSU_ID          0x780
  25 #define SCH5636_REG_FUJITSU_REV         0x783
  26
  27 #define SCH5636_NO_INS                  5
  28 #define SCH5636_NO_TEMPS                16
  29 #define SCH5636_NO_FANS                 8
  30
  31 static const u16 SCH5636_REG_IN_VAL[SCH5636_NO_INS] = {
  32         0x22, 0x23, 0x24, 0x25, 0x189 };
  33 static const u16 SCH5636_REG_IN_FACTORS[SCH5636_NO_INS] = {
  34         4400, 1500, 4000, 4400, 16000 };
  35 static const char * const SCH5636_IN_LABELS[SCH5636_NO_INS] = {
  36         "3.3V", "VREF", "VBAT", "3.3AUX", "12V" };
  37
  38 static const u16 SCH5636_REG_TEMP_VAL[SCH5636_NO_TEMPS] = {
  39         0x2B, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x180, 0x181,
  40         0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x8B, 0x8C };
  41 #define SCH5636_REG_TEMP_CTRL(i)        (0x790 + (i))
  42 #define SCH5636_TEMP_WORKING            0x01
  43 #define SCH5636_TEMP_ALARM              0x02
  44 #define SCH5636_TEMP_DEACTIVATED        0x80
  45
  46 static const u16 SCH5636_REG_FAN_VAL[SCH5636_NO_FANS] = {
  47         0x2C, 0x2E, 0x30, 0x32, 0x62, 0x64, 0x66, 0x68 };
  48 #define SCH5636_REG_FAN_CTRL(i)         (0x880 + (i))
  49 /* FAULT in datasheet, but acts as an alarm */
  50 #define SCH5636_FAN_ALARM               0x04
  51 #define SCH5636_FAN_NOT_PRESENT         0x08
  52 #define SCH5636_FAN_DEACTIVATED         0x80
  53
  54
  55 struct sch5636_data {
  56         unsigned short addr;
  57         struct device *hwmon_dev;
  58
  59         struct mutex update_lock;
  60         bool valid;                     /* true if following fields are valid */
  61         unsigned long last_updated;     /* In jiffies */
  62         u8 in[SCH5636_NO_INS];
  63         u8 temp_val[SCH5636_NO_TEMPS];
  64         u8 temp_ctrl[SCH5636_NO_TEMPS];
  65         u16 fan_val[SCH5636_NO_FANS];
  66         u8 fan_ctrl[SCH5636_NO_FANS];
  67 };
  68
  69 static struct sch5636_data *sch5636_update_device(struct device *dev)
  70 {
  71         struct sch5636_data *data = dev_get_drvdata(dev);
  72         struct sch5636_data *ret = data;
  73         int i, val;
  74
  75         mutex_lock(&data->update_lock);
  76
  77         /* Cache the values for 1 second */
  78         if (data->valid && !time_after(jiffies, data->last_updated + HZ))
  79                 goto abort;
  80
  81         for (i = 0; i < SCH5636_NO_INS; i++) {
  82                 val = sch56xx_read_virtual_reg(data->addr,
  83                                                SCH5636_REG_IN_VAL[i]);
  84                 if (unlikely(val < 0)) {
  85                         ret = ERR_PTR(val);
  86                         goto abort;
  87                 }
  88                 data->in[i] = val;
  89         }
  90
  91         for (i = 0; i < SCH5636_NO_TEMPS; i++) {
  92                 if (data->temp_ctrl[i] & SCH5636_TEMP_DEACTIVATED)
  93                         continue;
  94
  95                 val = sch56xx_read_virtual_reg(data->addr,
  96                                                SCH5636_REG_TEMP_VAL[i]);
  97                 if (unlikely(val < 0)) {
  98                         ret = ERR_PTR(val);
  99                         goto abort;
 100                 }
 101                 data->temp_val[i] = val;
 102
 103                 val = sch56xx_read_virtual_reg(data->addr,
 104                                                SCH5636_REG_TEMP_CTRL(i));
 105                 if (unlikely(val < 0)) {
 106                         ret = ERR_PTR(val);
 107                         goto abort;
 108                 }
 109                 data->temp_ctrl[i] = val;
 110                 /* Alarms need to be explicitly write-cleared */
 111                 if (val & SCH5636_TEMP_ALARM) {
 112                         sch56xx_write_virtual_reg(data->addr,
 113                                                 SCH5636_REG_TEMP_CTRL(i), val);
 114                 }
 115         }
 116
 117         for (i = 0; i < SCH5636_NO_FANS; i++) {
 118                 if (data->fan_ctrl[i] & SCH5636_FAN_DEACTIVATED)
 119                         continue;
 120
 121                 val = sch56xx_read_virtual_reg16(data->addr,
 122                                                  SCH5636_REG_FAN_VAL[i]);
 123                 if (unlikely(val < 0)) {
 124                         ret = ERR_PTR(val);
 125                         goto abort;
 126                 }
 127                 data->fan_val[i] = val;
 128
 129                 val = sch56xx_read_virtual_reg(data->addr,
 130                                                SCH5636_REG_FAN_CTRL(i));
 131                 if (unlikely(val < 0)) {
 132                         ret = ERR_PTR(val);
 133                         goto abort;
 134                 }
 135                 data->fan_ctrl[i] = val;
 136                 /* Alarms need to be explicitly write-cleared */
 137                 if (val & SCH5636_FAN_ALARM) {
 138                         sch56xx_write_virtual_reg(data->addr,
 139                                                 SCH5636_REG_FAN_CTRL(i), val);
 140                 }
 141         }
 142
 143         data->last_updated = jiffies;
 144         data->valid = true;
 145 abort:
 146         mutex_unlock(&data->update_lock);
 147         return ret;
 148 }
 149
 150 static int reg_to_rpm(u16 reg)
 151 {
 152         if (reg == 0)
 153                 return -EIO;
 154         if (reg == 0xffff)
 155                 return 0;
 156
 157         return 5400540 / reg;
 158 }
 159
 160 static ssize_t name_show(struct device *dev, struct device_attribute *devattr,
 161                          char *buf)
 162 {
 163         return sysfs_emit(buf, "%s\n", DEVNAME);
 164 }
 165
 166 static ssize_t in_value_show(struct device *dev,
 167                              struct device_attribute *devattr, char *buf)
 168 {
 169         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 170         struct sch5636_data *data = sch5636_update_device(dev);
 171         int val;
 172
 173         if (IS_ERR(data))
 174                 return PTR_ERR(data);
 175
 176         val = DIV_ROUND_CLOSEST(
 177                 data->in[attr->index] * SCH5636_REG_IN_FACTORS[attr->index],
 178                 255);
 179         return sysfs_emit(buf, "%d\n", val);
 180 }
 181
 182 static ssize_t in_label_show(struct device *dev,
 183                              struct device_attribute *devattr, char *buf)
 184 {
 185         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 186
 187         return sysfs_emit(buf, "%s\n",
 188                           SCH5636_IN_LABELS[attr->index]);
 189 }
 190
 191 static ssize_t temp_value_show(struct device *dev,
 192                                struct device_attribute *devattr, char *buf)
 193 {
 194         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 195         struct sch5636_data *data = sch5636_update_device(dev);
 196         int val;
 197
 198         if (IS_ERR(data))
 199                 return PTR_ERR(data);
 200
 201         val = (data->temp_val[attr->index] - 64) * 1000;
 202         return sysfs_emit(buf, "%d\n", val);
 203 }
 204
 205 static ssize_t temp_fault_show(struct device *dev,
 206                                struct device_attribute *devattr, char *buf)
 207 {
 208         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 209         struct sch5636_data *data = sch5636_update_device(dev);
 210         int val;
 211
 212         if (IS_ERR(data))
 213                 return PTR_ERR(data);
 214
 215         val = (data->temp_ctrl[attr->index] & SCH5636_TEMP_WORKING) ? 0 : 1;
 216         return sysfs_emit(buf, "%d\n", val);
 217 }
 218
 219 static ssize_t temp_alarm_show(struct device *dev,
 220                                struct device_attribute *devattr, char *buf)
 221 {
 222         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 223         struct sch5636_data *data = sch5636_update_device(dev);
 224         int val;
 225
 226         if (IS_ERR(data))
 227                 return PTR_ERR(data);
 228
 229         val = (data->temp_ctrl[attr->index] & SCH5636_TEMP_ALARM) ? 1 : 0;
 230         return sysfs_emit(buf, "%d\n", val);
 231 }
 232
 233 static ssize_t fan_value_show(struct device *dev,
 234                               struct device_attribute *devattr, char *buf)
 235 {
 236         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 237         struct sch5636_data *data = sch5636_update_device(dev);
 238         int val;
 239
 240         if (IS_ERR(data))
 241                 return PTR_ERR(data);
 242
 243         val = reg_to_rpm(data->fan_val[attr->index]);
 244         if (val < 0)
 245                 return val;
 246
 247         return sysfs_emit(buf, "%d\n", val);
 248 }
 249
 250 static ssize_t fan_fault_show(struct device *dev,
 251                               struct device_attribute *devattr, char *buf)
 252 {
 253         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 254         struct sch5636_data *data = sch5636_update_device(dev);
 255         int val;
 256
 257         if (IS_ERR(data))
 258                 return PTR_ERR(data);
 259
 260         val = (data->fan_ctrl[attr->index] & SCH5636_FAN_NOT_PRESENT) ? 1 : 0;
 261         return sysfs_emit(buf, "%d\n", val);
 262 }
 263
 264 static ssize_t fan_alarm_show(struct device *dev,
 265                               struct device_attribute *devattr, char *buf)
 266 {
 267         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 268         struct sch5636_data *data = sch5636_update_device(dev);
 269         int val;
 270
 271         if (IS_ERR(data))
 272                 return PTR_ERR(data);
 273
 274         val = (data->fan_ctrl[attr->index] & SCH5636_FAN_ALARM) ? 1 : 0;
 275         return sysfs_emit(buf, "%d\n", val);
 276 }
 277
 278 static struct sensor_device_attribute sch5636_attr[] = {
 279         SENSOR_ATTR_RO(name, name, 0),
 280         SENSOR_ATTR_RO(in0_input, in_value, 0),
 281         SENSOR_ATTR_RO(in0_label, in_label, 0),
 282         SENSOR_ATTR_RO(in1_input, in_value, 1),
 283         SENSOR_ATTR_RO(in1_label, in_label, 1),
 284         SENSOR_ATTR_RO(in2_input, in_value, 2),
 285         SENSOR_ATTR_RO(in2_label, in_label, 2),
 286         SENSOR_ATTR_RO(in3_input, in_value, 3),
 287         SENSOR_ATTR_RO(in3_label, in_label, 3),
 288         SENSOR_ATTR_RO(in4_input, in_value, 4),
 289         SENSOR_ATTR_RO(in4_label, in_label, 4),
 290 };
 291
 292 static struct sensor_device_attribute sch5636_temp_attr[] = {
 293         SENSOR_ATTR_RO(temp1_input, temp_value, 0),
 294         SENSOR_ATTR_RO(temp1_fault, temp_fault, 0),
 295         SENSOR_ATTR_RO(temp1_alarm, temp_alarm, 0),
 296         SENSOR_ATTR_RO(temp2_input, temp_value, 1),
 297         SENSOR_ATTR_RO(temp2_fault, temp_fault, 1),
 298         SENSOR_ATTR_RO(temp2_alarm, temp_alarm, 1),
 299         SENSOR_ATTR_RO(temp3_input, temp_value, 2),
 300         SENSOR_ATTR_RO(temp3_fault, temp_fault, 2),
 301         SENSOR_ATTR_RO(temp3_alarm, temp_alarm, 2),
 302         SENSOR_ATTR_RO(temp4_input, temp_value, 3),
 303         SENSOR_ATTR_RO(temp4_fault, temp_fault, 3),
 304         SENSOR_ATTR_RO(temp4_alarm, temp_alarm, 3),
 305         SENSOR_ATTR_RO(temp5_input, temp_value, 4),
 306         SENSOR_ATTR_RO(temp5_fault, temp_fault, 4),
 307         SENSOR_ATTR_RO(temp5_alarm, temp_alarm, 4),
 308         SENSOR_ATTR_RO(temp6_input, temp_value, 5),
 309         SENSOR_ATTR_RO(temp6_fault, temp_fault, 5),
 310         SENSOR_ATTR_RO(temp6_alarm, temp_alarm, 5),
 311         SENSOR_ATTR_RO(temp7_input, temp_value, 6),
 312         SENSOR_ATTR_RO(temp7_fault, temp_fault, 6),
 313         SENSOR_ATTR_RO(temp7_alarm, temp_alarm, 6),
 314         SENSOR_ATTR_RO(temp8_input, temp_value, 7),
 315         SENSOR_ATTR_RO(temp8_fault, temp_fault, 7),
 316         SENSOR_ATTR_RO(temp8_alarm, temp_alarm, 7),
 317         SENSOR_ATTR_RO(temp9_input, temp_value, 8),
 318         SENSOR_ATTR_RO(temp9_fault, temp_fault, 8),
 319         SENSOR_ATTR_RO(temp9_alarm, temp_alarm, 8),
 320         SENSOR_ATTR_RO(temp10_input, temp_value, 9),
 321         SENSOR_ATTR_RO(temp10_fault, temp_fault, 9),
 322         SENSOR_ATTR_RO(temp10_alarm, temp_alarm, 9),
 323         SENSOR_ATTR_RO(temp11_input, temp_value, 10),
 324         SENSOR_ATTR_RO(temp11_fault, temp_fault, 10),
 325         SENSOR_ATTR_RO(temp11_alarm, temp_alarm, 10),
 326         SENSOR_ATTR_RO(temp12_input, temp_value, 11),
 327         SENSOR_ATTR_RO(temp12_fault, temp_fault, 11),
 328         SENSOR_ATTR_RO(temp12_alarm, temp_alarm, 11),
 329         SENSOR_ATTR_RO(temp13_input, temp_value, 12),
 330         SENSOR_ATTR_RO(temp13_fault, temp_fault, 12),
 331         SENSOR_ATTR_RO(temp13_alarm, temp_alarm, 12),
 332         SENSOR_ATTR_RO(temp14_input, temp_value, 13),
 333         SENSOR_ATTR_RO(temp14_fault, temp_fault, 13),
 334         SENSOR_ATTR_RO(temp14_alarm, temp_alarm, 13),
 335         SENSOR_ATTR_RO(temp15_input, temp_value, 14),
 336         SENSOR_ATTR_RO(temp15_fault, temp_fault, 14),
 337         SENSOR_ATTR_RO(temp15_alarm, temp_alarm, 14),
 338         SENSOR_ATTR_RO(temp16_input, temp_value, 15),
 339         SENSOR_ATTR_RO(temp16_fault, temp_fault, 15),
 340         SENSOR_ATTR_RO(temp16_alarm, temp_alarm, 15),
 341 };
 342
 343 static struct sensor_device_attribute sch5636_fan_attr[] = {
 344         SENSOR_ATTR_RO(fan1_input, fan_value, 0),
 345         SENSOR_ATTR_RO(fan1_fault, fan_fault, 0),
 346         SENSOR_ATTR_RO(fan1_alarm, fan_alarm, 0),
 347         SENSOR_ATTR_RO(fan2_input, fan_value, 1),
 348         SENSOR_ATTR_RO(fan2_fault, fan_fault, 1),
 349         SENSOR_ATTR_RO(fan2_alarm, fan_alarm, 1),
 350         SENSOR_ATTR_RO(fan3_input, fan_value, 2),
 351         SENSOR_ATTR_RO(fan3_fault, fan_fault, 2),
 352         SENSOR_ATTR_RO(fan3_alarm, fan_alarm, 2),
 353         SENSOR_ATTR_RO(fan4_input, fan_value, 3),
 354         SENSOR_ATTR_RO(fan4_fault, fan_fault, 3),
 355         SENSOR_ATTR_RO(fan4_alarm, fan_alarm, 3),
 356         SENSOR_ATTR_RO(fan5_input, fan_value, 4),
 357         SENSOR_ATTR_RO(fan5_fault, fan_fault, 4),
 358         SENSOR_ATTR_RO(fan5_alarm, fan_alarm, 4),
 359         SENSOR_ATTR_RO(fan6_input, fan_value, 5),
 360         SENSOR_ATTR_RO(fan6_fault, fan_fault, 5),
 361         SENSOR_ATTR_RO(fan6_alarm, fan_alarm, 5),
 362         SENSOR_ATTR_RO(fan7_input, fan_value, 6),
 363         SENSOR_ATTR_RO(fan7_fault, fan_fault, 6),
 364         SENSOR_ATTR_RO(fan7_alarm, fan_alarm, 6),
 365         SENSOR_ATTR_RO(fan8_input, fan_value, 7),
 366         SENSOR_ATTR_RO(fan8_fault, fan_fault, 7),
 367         SENSOR_ATTR_RO(fan8_alarm, fan_alarm, 7),
 368 };
 369
 370 static int sch5636_remove(struct platform_device *pdev)
 371 {
 372         struct sch5636_data *data = platform_get_drvdata(pdev);
 373         int i;
 374
 375         if (data->hwmon_dev)
 376                 hwmon_device_unregister(data->hwmon_dev);
 377
 378         for (i = 0; i < ARRAY_SIZE(sch5636_attr); i++)
 379                 device_remove_file(&pdev->dev, &sch5636_attr[i].dev_attr);
 380
 381         for (i = 0; i < SCH5636_NO_TEMPS * 3; i++)
 382                 device_remove_file(&pdev->dev,
 383                                    &sch5636_temp_attr[i].dev_attr);
 384
 385         for (i = 0; i < SCH5636_NO_FANS * 3; i++)
 386                 device_remove_file(&pdev->dev,
 387                                    &sch5636_fan_attr[i].dev_attr);
 388
 389         return 0;
 390 }
 391
 392 static int sch5636_probe(struct platform_device *pdev)
 393 {
 394         struct sch5636_data *data;
 395         int i, err, val, revision[2];
 396         char id[4];
 397
 398         data = devm_kzalloc(&pdev->dev, sizeof(struct sch5636_data),
 399                             GFP_KERNEL);
 400         if (!data)
 401                 return -ENOMEM;
 402
 403         data->addr = platform_get_resource(pdev, IORESOURCE_IO, 0)->start;
 404         mutex_init(&data->update_lock);
 405         platform_set_drvdata(pdev, data);
 406
 407         for (i = 0; i < 3; i++) {
 408                 val = sch56xx_read_virtual_reg(data->addr,
 409                                                SCH5636_REG_FUJITSU_ID + i);
 410                 if (val < 0) {
 411                         pr_err("Could not read Fujitsu id byte at %#x\n",
 412                                 SCH5636_REG_FUJITSU_ID + i);
 413                         err = val;
 414                         goto error;
 415                 }
 416                 id[i] = val;
 417         }
 418         id[i] = '\0';
 419
 420         if (strcmp(id, "THS")) {
 421                 pr_err("Unknown Fujitsu id: %02x%02x%02x\n",
 422                        id[0], id[1], id[2]);
 423                 err = -ENODEV;
 424                 goto error;
 425         }
 426
 427         for (i = 0; i < 2; i++) {
 428                 val = sch56xx_read_virtual_reg(data->addr,
 429                                                SCH5636_REG_FUJITSU_REV + i);
 430                 if (val < 0) {
 431                         err = val;
 432                         goto error;
 433                 }
 434                 revision[i] = val;
 435         }
 436         pr_info("Found %s chip at %#hx, revision: %d.%02d\n", DEVNAME,
 437                 data->addr, revision[0], revision[1]);
 438
 439         /* Read all temp + fan ctrl registers to determine which are active */
 440         for (i = 0; i < SCH5636_NO_TEMPS; i++) {
 441                 val = sch56xx_read_virtual_reg(data->addr,
 442                                                SCH5636_REG_TEMP_CTRL(i));
 443                 if (unlikely(val < 0)) {
 444                         err = val;
 445                         goto error;
 446                 }
 447                 data->temp_ctrl[i] = val;
 448         }
 449
 450         for (i = 0; i < SCH5636_NO_FANS; i++) {
 451                 val = sch56xx_read_virtual_reg(data->addr,
 452                                                SCH5636_REG_FAN_CTRL(i));
 453                 if (unlikely(val < 0)) {
 454                         err = val;
 455                         goto error;
 456                 }
 457                 data->fan_ctrl[i] = val;
 458         }
 459
 460         for (i = 0; i < ARRAY_SIZE(sch5636_attr); i++) {
 461                 err = device_create_file(&pdev->dev,
 462                                          &sch5636_attr[i].dev_attr);
 463                 if (err)
 464                         goto error;
 465         }
 466
 467         for (i = 0; i < (SCH5636_NO_TEMPS * 3); i++) {
 468                 if (data->temp_ctrl[i/3] & SCH5636_TEMP_DEACTIVATED)
 469                         continue;
 470
 471                 err = device_create_file(&pdev->dev,
 472                                         &sch5636_temp_attr[i].dev_attr);
 473                 if (err)
 474                         goto error;
 475         }
 476
 477         for (i = 0; i < (SCH5636_NO_FANS * 3); i++) {
 478                 if (data->fan_ctrl[i/3] & SCH5636_FAN_DEACTIVATED)
 479                         continue;
 480
 481                 err = device_create_file(&pdev->dev,
 482                                         &sch5636_fan_attr[i].dev_attr);
 483                 if (err)
 484                         goto error;
 485         }
 486
 487         data->hwmon_dev = hwmon_device_register(&pdev->dev);
 488         if (IS_ERR(data->hwmon_dev)) {
 489                 err = PTR_ERR(data->hwmon_dev);
 490                 data->hwmon_dev = NULL;
 491                 goto error;
 492         }
 493
 494         /* Note failing to register the watchdog is not a fatal error */
 495         sch56xx_watchdog_register(&pdev->dev, data->addr, (revision[0] << 8) | revision[1],
 496                                   &data->update_lock, 0);
 497
 498         return 0;
 499
 500 error:
 501         sch5636_remove(pdev);
 502         return err;
 503 }
 504
 505 static const struct platform_device_id sch5636_device_id[] = {
 506         {
 507                 .name = "sch5636",
 508         },
 509         { }
 510 };
 511 MODULE_DEVICE_TABLE(platform, sch5636_device_id);
 512
 513 static struct platform_driver sch5636_driver = {
 514         .driver = {
 515                 .name   = DRVNAME,
 516         },
 517         .probe          = sch5636_probe,
 518         .remove         = sch5636_remove,
 519         .id_table       = sch5636_device_id,
 520 };
 521
 522 module_platform_driver(sch5636_driver);
 523
 524 MODULE_DESCRIPTION("SMSC SCH5636 Hardware Monitoring Driver");
 525 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
 526 MODULE_LICENSE("GPL");