drivers/hwmon/fscpos.c

   1 /*
   2         fscpos.c - Kernel module for hardware monitoring with FSC Poseidon chips
   3         Copyright (C) 2004, 2005 Stefan Ott <stefan@desire.ch>
   4
   5         This program is free software; you can redistribute it and/or modify
   6         it under the terms of the GNU General Public License as published by
   7         the Free Software Foundation; either version 2 of the License, or
   8         (at your option) any later version.
   9
  10         This program is distributed in the hope that it will be useful,
  11         but WITHOUT ANY WARRANTY; without even the implied warranty of
  12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13         GNU General Public License for more details.
  14
  15         You should have received a copy of the GNU General Public License
  16         along with this program; if not, write to the Free Software
  17         Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18 */
  19
  20 /*
  21         fujitsu siemens poseidon chip,
  22         module based on the old fscpos module by Hermann Jung <hej@odn.de> and
  23         the fscher module by Reinhard Nissl <rnissl@gmx.de>
  24
  25         original module based on lm80.c
  26         Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl>
  27         and Philip Edelbrock <phil@netroedge.com>
  28
  29         Thanks to Jean Delvare for reviewing my code and suggesting a lot of
  30         improvements.
  31 */
  32
  33 #include <linux/module.h>
  34 #include <linux/slab.h>
  35 #include <linux/jiffies.h>
  36 #include <linux/i2c.h>
  37 #include <linux/init.h>
  38 #include <linux/hwmon.h>
  39 #include <linux/err.h>
  40 #include <linux/mutex.h>
  41 #include <linux/sysfs.h>
  42
  43 /*
  44  * Addresses to scan
  45  */
  46 static const unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END };
  47
  48 /*
  49  * Insmod parameters
  50  */
  51 I2C_CLIENT_INSMOD_1(fscpos);
  52
  53 /*
  54  * The FSCPOS registers
  55  */
  56
  57 /* chip identification */
  58 #define FSCPOS_REG_IDENT_0              0x00
  59 #define FSCPOS_REG_IDENT_1              0x01
  60 #define FSCPOS_REG_IDENT_2              0x02
  61 #define FSCPOS_REG_REVISION             0x03
  62
  63 /* global control and status */
  64 #define FSCPOS_REG_EVENT_STATE          0x04
  65 #define FSCPOS_REG_CONTROL              0x05
  66
  67 /* watchdog */
  68 #define FSCPOS_REG_WDOG_PRESET          0x28
  69 #define FSCPOS_REG_WDOG_STATE           0x23
  70 #define FSCPOS_REG_WDOG_CONTROL         0x21
  71
  72 /* voltages */
  73 #define FSCPOS_REG_VOLT_12              0x45
  74 #define FSCPOS_REG_VOLT_5               0x42
  75 #define FSCPOS_REG_VOLT_BATT            0x48
  76
  77 /* fans - the chip does not support minimum speed for fan2 */
  78 static u8 FSCPOS_REG_PWM[] = { 0x55, 0x65 };
  79 static u8 FSCPOS_REG_FAN_ACT[] = { 0x0e, 0x6b, 0xab };
  80 static u8 FSCPOS_REG_FAN_STATE[] = { 0x0d, 0x62, 0xa2 };
  81 static u8 FSCPOS_REG_FAN_RIPPLE[] = { 0x0f, 0x6f, 0xaf };
  82
  83 /* temperatures */
  84 static u8 FSCPOS_REG_TEMP_ACT[] = { 0x64, 0x32, 0x35 };
  85 static u8 FSCPOS_REG_TEMP_STATE[] = { 0x71, 0x81, 0x91 };
  86
  87 /*
  88  * Functions declaration
  89  */
  90 static int fscpos_probe(struct i2c_client *client,
  91                         const struct i2c_device_id *id);
  92 static int fscpos_detect(struct i2c_client *client, int kind,
  93                          struct i2c_board_info *info);
  94 static int fscpos_remove(struct i2c_client *client);
  95
  96 static int fscpos_read_value(struct i2c_client *client, u8 reg);
  97 static int fscpos_write_value(struct i2c_client *client, u8 reg, u8 value);
  98 static struct fscpos_data *fscpos_update_device(struct device *dev);
  99 static void fscpos_init_client(struct i2c_client *client);
 100
 101 static void reset_fan_alarm(struct i2c_client *client, int nr);
 102
 103 /*
 104  * Driver data (common to all clients)
 105  */
 106 static const struct i2c_device_id fscpos_id[] = {
 107         { "fscpos", fscpos },
 108         { }
 109 };
 110
 111 static struct i2c_driver fscpos_driver = {
 112         .class          = I2C_CLASS_HWMON,
 113         .driver = {
 114                 .name   = "fscpos",
 115         },
 116         .probe          = fscpos_probe,
 117         .remove         = fscpos_remove,
 118         .id_table       = fscpos_id,
 119         .detect         = fscpos_detect,
 120         .address_data   = &addr_data,
 121 };
 122
 123 /*
 124  * Client data (each client gets its own)
 125  */
 126 struct fscpos_data {
 127         struct device *hwmon_dev;
 128         struct mutex update_lock;
 129         char valid;             /* 0 until following fields are valid */
 130         unsigned long last_updated;     /* In jiffies */
 131
 132         /* register values */
 133         u8 revision;            /* revision of chip */
 134         u8 global_event;        /* global event status */
 135         u8 global_control;      /* global control register */
 136         u8 wdog_control;        /* watchdog control */
 137         u8 wdog_state;          /* watchdog status */
 138         u8 wdog_preset;         /* watchdog preset */
 139         u8 volt[3];             /* 12, 5, battery current */
 140         u8 temp_act[3];         /* temperature */
 141         u8 temp_status[3];      /* status of sensor */
 142         u8 fan_act[3];          /* fans revolutions per second */
 143         u8 fan_status[3];       /* fan status */
 144         u8 pwm[2];              /* fan min value for rps */
 145         u8 fan_ripple[3];       /* divider for rps */
 146 };
 147
 148 /* Temperature */
 149 #define TEMP_FROM_REG(val)      (((val) - 128) * 1000)
 150
 151 static ssize_t show_temp_input(struct fscpos_data *data, char *buf, int nr)
 152 {
 153         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_act[nr - 1]));
 154 }
 155
 156 static ssize_t show_temp_status(struct fscpos_data *data, char *buf, int nr)
 157 {
 158         /* bits 2..7 reserved => mask with 0x03 */
 159         return sprintf(buf, "%u\n", data->temp_status[nr - 1] & 0x03);
 160 }
 161
 162 static ssize_t show_temp_reset(struct fscpos_data *data, char *buf, int nr)
 163 {
 164         return sprintf(buf, "1\n");
 165 }
 166
 167 static ssize_t set_temp_reset(struct i2c_client *client, struct fscpos_data
 168                         *data, const char *buf, size_t count, int nr, int reg)
 169 {
 170         unsigned long v = simple_strtoul(buf, NULL, 10);
 171         if (v != 1) {
 172                 dev_err(&client->dev, "temp_reset value %ld not supported. "
 173                                         "Use 1 to reset the alarm!\n", v);
 174                 return -EINVAL;
 175         }
 176
 177         dev_info(&client->dev, "You used the temp_reset feature which has not "
 178                                 "been proplerly tested. Please report your "
 179                                 "experience to the module author.\n");
 180
 181         /* Supported value: 2 (clears the status) */
 182         fscpos_write_value(client, FSCPOS_REG_TEMP_STATE[nr - 1], 2);
 183         return count;
 184 }
 185
 186 /* Fans */
 187 #define RPM_FROM_REG(val)       ((val) * 60)
 188
 189 static ssize_t show_fan_status(struct fscpos_data *data, char *buf, int nr)
 190 {
 191         /* bits 0..1, 3..7 reserved => mask with 0x04 */
 192         return sprintf(buf, "%u\n", data->fan_status[nr - 1] & 0x04);
 193 }
 194
 195 static ssize_t show_fan_input(struct fscpos_data *data, char *buf, int nr)
 196 {
 197         return sprintf(buf, "%u\n", RPM_FROM_REG(data->fan_act[nr - 1]));
 198 }
 199
 200 static ssize_t show_fan_ripple(struct fscpos_data *data, char *buf, int nr)
 201 {
 202         /* bits 2..7 reserved => mask with 0x03 */
 203         return sprintf(buf, "%u\n", data->fan_ripple[nr - 1] & 0x03);
 204 }
 205
 206 static ssize_t set_fan_ripple(struct i2c_client *client, struct fscpos_data
 207                         *data, const char *buf, size_t count, int nr, int reg)
 208 {
 209         /* supported values: 2, 4, 8 */
 210         unsigned long v = simple_strtoul(buf, NULL, 10);
 211
 212         switch (v) {
 213                 case 2: v = 1; break;
 214                 case 4: v = 2; break;
 215                 case 8: v = 3; break;
 216         default:
 217                 dev_err(&client->dev, "fan_ripple value %ld not supported. "
 218                                         "Must be one of 2, 4 or 8!\n", v);
 219                 return -EINVAL;
 220         }
 221
 222         mutex_lock(&data->update_lock);
 223         /* bits 2..7 reserved => mask with 0x03 */
 224         data->fan_ripple[nr - 1] &= ~0x03;
 225         data->fan_ripple[nr - 1] |= v;
 226
 227         fscpos_write_value(client, reg, data->fan_ripple[nr - 1]);
 228         mutex_unlock(&data->update_lock);
 229         return count;
 230 }
 231
 232 static ssize_t show_pwm(struct fscpos_data *data, char *buf, int nr)
 233 {
 234         return sprintf(buf, "%u\n", data->pwm[nr - 1]);
 235 }
 236
 237 static ssize_t set_pwm(struct i2c_client *client, struct fscpos_data *data,
 238                                 const char *buf, size_t count, int nr, int reg)
 239 {
 240         unsigned long v = simple_strtoul(buf, NULL, 10);
 241
 242         /* Range: 0..255 */
 243         if (v < 0) v = 0;
 244         if (v > 255) v = 255;
 245
 246         mutex_lock(&data->update_lock);
 247         data->pwm[nr - 1] = v;
 248         fscpos_write_value(client, reg, data->pwm[nr - 1]);
 249         mutex_unlock(&data->update_lock);
 250         return count;
 251 }
 252
 253 static void reset_fan_alarm(struct i2c_client *client, int nr)
 254 {
 255         fscpos_write_value(client, FSCPOS_REG_FAN_STATE[nr], 4);
 256 }
 257
 258 /* Volts */
 259 #define VOLT_FROM_REG(val, mult)        ((val) * (mult) / 255)
 260
 261 static ssize_t show_volt_12(struct device *dev, struct device_attribute *attr, char *buf)
 262 {
 263         struct fscpos_data *data = fscpos_update_device(dev);
 264         return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[0], 14200));
 265 }
 266
 267 static ssize_t show_volt_5(struct device *dev, struct device_attribute *attr, char *buf)
 268 {
 269         struct fscpos_data *data = fscpos_update_device(dev);
 270         return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[1], 6600));
 271 }
 272
 273 static ssize_t show_volt_batt(struct device *dev, struct device_attribute *attr, char *buf)
 274 {
 275         struct fscpos_data *data = fscpos_update_device(dev);
 276         return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[2], 3300));
 277 }
 278
 279 /* Watchdog */
 280 static ssize_t show_wdog_control(struct fscpos_data *data, char *buf)
 281 {
 282         /* bits 0..3 reserved, bit 6 write only => mask with 0xb0 */
 283         return sprintf(buf, "%u\n", data->wdog_control & 0xb0);
 284 }
 285
 286 static ssize_t set_wdog_control(struct i2c_client *client, struct fscpos_data
 287                                 *data, const char *buf, size_t count, int reg)
 288 {
 289         /* bits 0..3 reserved => mask with 0xf0 */
 290         unsigned long v = simple_strtoul(buf, NULL, 10) & 0xf0;
 291
 292         mutex_lock(&data->update_lock);
 293         data->wdog_control &= ~0xf0;
 294         data->wdog_control |= v;
 295         fscpos_write_value(client, reg, data->wdog_control);
 296         mutex_unlock(&data->update_lock);
 297         return count;
 298 }
 299
 300 static ssize_t show_wdog_state(struct fscpos_data *data, char *buf)
 301 {
 302         /* bits 0, 2..7 reserved => mask with 0x02 */
 303         return sprintf(buf, "%u\n", data->wdog_state & 0x02);
 304 }
 305
 306 static ssize_t set_wdog_state(struct i2c_client *client, struct fscpos_data
 307                                 *data, const char *buf, size_t count, int reg)
 308 {
 309         unsigned long v = simple_strtoul(buf, NULL, 10) & 0x02;
 310
 311         /* Valid values: 2 (clear) */
 312         if (v != 2) {
 313                 dev_err(&client->dev, "wdog_state value %ld not supported. "
 314                                         "Must be 2 to clear the state!\n", v);
 315                 return -EINVAL;
 316         }
 317
 318         mutex_lock(&data->update_lock);
 319         data->wdog_state &= ~v;
 320         fscpos_write_value(client, reg, v);
 321         mutex_unlock(&data->update_lock);
 322         return count;
 323 }
 324
 325 static ssize_t show_wdog_preset(struct fscpos_data *data, char *buf)
 326 {
 327         return sprintf(buf, "%u\n", data->wdog_preset);
 328 }
 329
 330 static ssize_t set_wdog_preset(struct i2c_client *client, struct fscpos_data
 331                                 *data, const char *buf, size_t count, int reg)
 332 {
 333         unsigned long v = simple_strtoul(buf, NULL, 10) & 0xff;
 334
 335         mutex_lock(&data->update_lock);
 336         data->wdog_preset = v;
 337         fscpos_write_value(client, reg, data->wdog_preset);
 338         mutex_unlock(&data->update_lock);
 339         return count;
 340 }
 341
 342 /* Event */
 343 static ssize_t show_event(struct device *dev, struct device_attribute *attr, char *buf)
 344 {
 345         /* bits 5..7 reserved => mask with 0x1f */
 346         struct fscpos_data *data = fscpos_update_device(dev);
 347         return sprintf(buf, "%u\n", data->global_event & 0x9b);
 348 }
 349
 350 /*
 351  * Sysfs stuff
 352  */
 353 #define create_getter(kind, sub) \
 354         static ssize_t sysfs_show_##kind##sub(struct device *dev, struct device_attribute *attr, char *buf) \
 355         { \
 356                 struct fscpos_data *data = fscpos_update_device(dev); \
 357                 return show_##kind##sub(data, buf); \
 358         }
 359
 360 #define create_getter_n(kind, offset, sub) \
 361         static ssize_t sysfs_show_##kind##offset##sub(struct device *dev, struct device_attribute *attr, char\
 362                                                                         *buf) \
 363         { \
 364                 struct fscpos_data *data = fscpos_update_device(dev); \
 365                 return show_##kind##sub(data, buf, offset); \
 366         }
 367
 368 #define create_setter(kind, sub, reg) \
 369         static ssize_t sysfs_set_##kind##sub (struct device *dev, struct device_attribute *attr, const char \
 370                                                         *buf, size_t count) \
 371         { \
 372                 struct i2c_client *client = to_i2c_client(dev); \
 373                 struct fscpos_data *data = i2c_get_clientdata(client); \
 374                 return set_##kind##sub(client, data, buf, count, reg); \
 375         }
 376
 377 #define create_setter_n(kind, offset, sub, reg) \
 378         static ssize_t sysfs_set_##kind##offset##sub (struct device *dev, struct device_attribute *attr, \
 379                                         const char *buf, size_t count) \
 380         { \
 381                 struct i2c_client *client = to_i2c_client(dev); \
 382                 struct fscpos_data *data = i2c_get_clientdata(client); \
 383                 return set_##kind##sub(client, data, buf, count, offset, reg);\
 384         }
 385
 386 #define create_sysfs_device_ro(kind, sub, offset) \
 387         static DEVICE_ATTR(kind##offset##sub, S_IRUGO, \
 388                                         sysfs_show_##kind##offset##sub, NULL);
 389
 390 #define create_sysfs_device_rw(kind, sub, offset) \
 391         static DEVICE_ATTR(kind##offset##sub, S_IRUGO | S_IWUSR, \
 392                 sysfs_show_##kind##offset##sub, sysfs_set_##kind##offset##sub);
 393
 394 #define sysfs_ro_n(kind, sub, offset) \
 395         create_getter_n(kind, offset, sub); \
 396         create_sysfs_device_ro(kind, sub, offset);
 397
 398 #define sysfs_rw_n(kind, sub, offset, reg) \
 399         create_getter_n(kind, offset, sub); \
 400         create_setter_n(kind, offset, sub, reg); \
 401         create_sysfs_device_rw(kind, sub, offset);
 402
 403 #define sysfs_rw(kind, sub, reg) \
 404         create_getter(kind, sub); \
 405         create_setter(kind, sub, reg); \
 406         create_sysfs_device_rw(kind, sub,);
 407
 408 #define sysfs_fan_with_min(offset, reg_status, reg_ripple, reg_min) \
 409         sysfs_fan(offset, reg_status, reg_ripple); \
 410         sysfs_rw_n(pwm,, offset, reg_min);
 411
 412 #define sysfs_fan(offset, reg_status, reg_ripple) \
 413         sysfs_ro_n(fan, _input, offset); \
 414         sysfs_ro_n(fan, _status, offset); \
 415         sysfs_rw_n(fan, _ripple, offset, reg_ripple);
 416
 417 #define sysfs_temp(offset, reg_status) \
 418         sysfs_ro_n(temp, _input, offset); \
 419         sysfs_ro_n(temp, _status, offset); \
 420         sysfs_rw_n(temp, _reset, offset, reg_status);
 421
 422 #define sysfs_watchdog(reg_wdog_preset, reg_wdog_state, reg_wdog_control) \
 423         sysfs_rw(wdog, _control, reg_wdog_control); \
 424         sysfs_rw(wdog, _preset, reg_wdog_preset); \
 425         sysfs_rw(wdog, _state, reg_wdog_state);
 426
 427 sysfs_fan_with_min(1, FSCPOS_REG_FAN_STATE[0], FSCPOS_REG_FAN_RIPPLE[0],
 428                                                         FSCPOS_REG_PWM[0]);
 429 sysfs_fan_with_min(2, FSCPOS_REG_FAN_STATE[1], FSCPOS_REG_FAN_RIPPLE[1],
 430                                                         FSCPOS_REG_PWM[1]);
 431 sysfs_fan(3, FSCPOS_REG_FAN_STATE[2], FSCPOS_REG_FAN_RIPPLE[2]);
 432
 433 sysfs_temp(1, FSCPOS_REG_TEMP_STATE[0]);
 434 sysfs_temp(2, FSCPOS_REG_TEMP_STATE[1]);
 435 sysfs_temp(3, FSCPOS_REG_TEMP_STATE[2]);
 436
 437 sysfs_watchdog(FSCPOS_REG_WDOG_PRESET, FSCPOS_REG_WDOG_STATE,
 438                                                 FSCPOS_REG_WDOG_CONTROL);
 439
 440 static DEVICE_ATTR(event, S_IRUGO, show_event, NULL);
 441 static DEVICE_ATTR(in0_input, S_IRUGO, show_volt_12, NULL);
 442 static DEVICE_ATTR(in1_input, S_IRUGO, show_volt_5, NULL);
 443 static DEVICE_ATTR(in2_input, S_IRUGO, show_volt_batt, NULL);
 444
 445 static struct attribute *fscpos_attributes[] = {
 446         &dev_attr_event.attr,
 447         &dev_attr_in0_input.attr,
 448         &dev_attr_in1_input.attr,
 449         &dev_attr_in2_input.attr,
 450
 451         &dev_attr_wdog_control.attr,
 452         &dev_attr_wdog_preset.attr,
 453         &dev_attr_wdog_state.attr,
 454
 455         &dev_attr_temp1_input.attr,
 456         &dev_attr_temp1_status.attr,
 457         &dev_attr_temp1_reset.attr,
 458         &dev_attr_temp2_input.attr,
 459         &dev_attr_temp2_status.attr,
 460         &dev_attr_temp2_reset.attr,
 461         &dev_attr_temp3_input.attr,
 462         &dev_attr_temp3_status.attr,
 463         &dev_attr_temp3_reset.attr,
 464
 465         &dev_attr_fan1_input.attr,
 466         &dev_attr_fan1_status.attr,
 467         &dev_attr_fan1_ripple.attr,
 468         &dev_attr_pwm1.attr,
 469         &dev_attr_fan2_input.attr,
 470         &dev_attr_fan2_status.attr,
 471         &dev_attr_fan2_ripple.attr,
 472         &dev_attr_pwm2.attr,
 473         &dev_attr_fan3_input.attr,
 474         &dev_attr_fan3_status.attr,
 475         &dev_attr_fan3_ripple.attr,
 476         NULL
 477 };
 478
 479 static const struct attribute_group fscpos_group = {
 480         .attrs = fscpos_attributes,
 481 };
 482
 483 /* Return 0 if detection is successful, -ENODEV otherwise */
 484 static int fscpos_detect(struct i2c_client *new_client, int kind,
 485                          struct i2c_board_info *info)
 486 {
 487         struct i2c_adapter *adapter = new_client->adapter;
 488
 489         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 490                 return -ENODEV;
 491
 492         /* Do the remaining detection unless force or force_fscpos parameter */
 493         if (kind < 0) {
 494                 if ((fscpos_read_value(new_client, FSCPOS_REG_IDENT_0)
 495                         != 0x50) /* 'P' */
 496                 || (fscpos_read_value(new_client, FSCPOS_REG_IDENT_1)
 497                         != 0x45) /* 'E' */
 498                 || (fscpos_read_value(new_client, FSCPOS_REG_IDENT_2)
 499                         != 0x47))/* 'G' */
 500                         return -ENODEV;
 501         }
 502
 503         strlcpy(info->type, "fscpos", I2C_NAME_SIZE);
 504
 505         return 0;
 506 }
 507
 508 static int fscpos_probe(struct i2c_client *new_client,
 509                         const struct i2c_device_id *id)
 510 {
 511         struct fscpos_data *data;
 512         int err;
 513
 514         data = kzalloc(sizeof(struct fscpos_data), GFP_KERNEL);
 515         if (!data) {
 516                 err = -ENOMEM;
 517                 goto exit;
 518         }
 519
 520         i2c_set_clientdata(new_client, data);
 521         data->valid = 0;
 522         mutex_init(&data->update_lock);
 523
 524         /* Inizialize the fscpos chip */
 525         fscpos_init_client(new_client);
 526
 527         /* Announce that the chip was found */
 528         dev_info(&new_client->dev, "Found fscpos chip, rev %u\n", data->revision);
 529
 530         /* Register sysfs hooks */
 531         if ((err = sysfs_create_group(&new_client->dev.kobj, &fscpos_group)))
 532                 goto exit_free;
 533
 534         data->hwmon_dev = hwmon_device_register(&new_client->dev);
 535         if (IS_ERR(data->hwmon_dev)) {
 536                 err = PTR_ERR(data->hwmon_dev);
 537                 goto exit_remove_files;
 538         }
 539
 540         return 0;
 541
 542 exit_remove_files:
 543         sysfs_remove_group(&new_client->dev.kobj, &fscpos_group);
 544 exit_free:
 545         kfree(data);
 546 exit:
 547         return err;
 548 }
 549
 550 static int fscpos_remove(struct i2c_client *client)
 551 {
 552         struct fscpos_data *data = i2c_get_clientdata(client);
 553
 554         hwmon_device_unregister(data->hwmon_dev);
 555         sysfs_remove_group(&client->dev.kobj, &fscpos_group);
 556
 557         kfree(data);
 558         return 0;
 559 }
 560
 561 static int fscpos_read_value(struct i2c_client *client, u8 reg)
 562 {
 563         dev_dbg(&client->dev, "Read reg 0x%02x\n", reg);
 564         return i2c_smbus_read_byte_data(client, reg);
 565 }
 566
 567 static int fscpos_write_value(struct i2c_client *client, u8 reg, u8 value)
 568 {
 569         dev_dbg(&client->dev, "Write reg 0x%02x, val 0x%02x\n", reg, value);
 570         return i2c_smbus_write_byte_data(client, reg, value);
 571 }
 572
 573 /* Called when we have found a new FSCPOS chip */
 574 static void fscpos_init_client(struct i2c_client *client)
 575 {
 576         struct fscpos_data *data = i2c_get_clientdata(client);
 577
 578         /* read revision from chip */
 579         data->revision = fscpos_read_value(client, FSCPOS_REG_REVISION);
 580 }
 581
 582 static struct fscpos_data *fscpos_update_device(struct device *dev)
 583 {
 584         struct i2c_client *client = to_i2c_client(dev);
 585         struct fscpos_data *data = i2c_get_clientdata(client);
 586
 587         mutex_lock(&data->update_lock);
 588
 589         if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
 590                 int i;
 591
 592                 dev_dbg(&client->dev, "Starting fscpos update\n");
 593
 594                 for (i = 0; i < 3; i++) {
 595                         data->temp_act[i] = fscpos_read_value(client,
 596                                                 FSCPOS_REG_TEMP_ACT[i]);
 597                         data->temp_status[i] = fscpos_read_value(client,
 598                                                 FSCPOS_REG_TEMP_STATE[i]);
 599                         data->fan_act[i] = fscpos_read_value(client,
 600                                                 FSCPOS_REG_FAN_ACT[i]);
 601                         data->fan_status[i] = fscpos_read_value(client,
 602                                                 FSCPOS_REG_FAN_STATE[i]);
 603                         data->fan_ripple[i] = fscpos_read_value(client,
 604                                                 FSCPOS_REG_FAN_RIPPLE[i]);
 605                         if (i < 2) {
 606                                 /* fan2_min is not supported by the chip */
 607                                 data->pwm[i] = fscpos_read_value(client,
 608                                                         FSCPOS_REG_PWM[i]);
 609                         }
 610                         /* reset fan status if speed is back to > 0 */
 611                         if (data->fan_status[i] != 0 && data->fan_act[i] > 0) {
 612                                 reset_fan_alarm(client, i);
 613                         }
 614                 }
 615
 616                 data->volt[0] = fscpos_read_value(client, FSCPOS_REG_VOLT_12);
 617                 data->volt[1] = fscpos_read_value(client, FSCPOS_REG_VOLT_5);
 618                 data->volt[2] = fscpos_read_value(client, FSCPOS_REG_VOLT_BATT);
 619
 620                 data->wdog_preset = fscpos_read_value(client,
 621                                                         FSCPOS_REG_WDOG_PRESET);
 622                 data->wdog_state = fscpos_read_value(client,
 623                                                         FSCPOS_REG_WDOG_STATE);
 624                 data->wdog_control = fscpos_read_value(client,
 625                                                 FSCPOS_REG_WDOG_CONTROL);
 626
 627                 data->global_event = fscpos_read_value(client,
 628                                                 FSCPOS_REG_EVENT_STATE);
 629
 630                 data->last_updated = jiffies;
 631                 data->valid = 1;
 632         }
 633         mutex_unlock(&data->update_lock);
 634         return data;
 635 }
 636
 637 static int __init sm_fscpos_init(void)
 638 {
 639         return i2c_add_driver(&fscpos_driver);
 640 }
 641
 642 static void __exit sm_fscpos_exit(void)
 643 {
 644         i2c_del_driver(&fscpos_driver);
 645 }
 646
 647 MODULE_AUTHOR("Stefan Ott <stefan@desire.ch> based on work from Hermann Jung "
 648                                 "<hej@odn.de>, Frodo Looijaard <frodol@dds.nl>"
 649                                 " and Philip Edelbrock <phil@netroedge.com>");
 650 MODULE_DESCRIPTION("fujitsu siemens poseidon chip driver");
 651 MODULE_LICENSE("GPL");
 652
 653 module_init(sm_fscpos_init);
 654 module_exit(sm_fscpos_exit);