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_attach_adapter(struct i2c_adapter *adapter);
  91 static int fscpos_detect(struct i2c_adapter *adapter, int address, int kind);
  92 static int fscpos_detach_client(struct i2c_client *client);
  93
  94 static int fscpos_read_value(struct i2c_client *client, u8 reg);
  95 static int fscpos_write_value(struct i2c_client *client, u8 reg, u8 value);
  96 static struct fscpos_data *fscpos_update_device(struct device *dev);
  97 static void fscpos_init_client(struct i2c_client *client);
  98
  99 static void reset_fan_alarm(struct i2c_client *client, int nr);
 100
 101 /*
 102  * Driver data (common to all clients)
 103  */
 104 static struct i2c_driver fscpos_driver = {
 105         .driver = {
 106                 .name   = "fscpos",
 107         },
 108         .attach_adapter = fscpos_attach_adapter,
 109         .detach_client  = fscpos_detach_client,
 110 };
 111
 112 /*
 113  * Client data (each client gets its own)
 114  */
 115 struct fscpos_data {
 116         struct i2c_client client;
 117         struct device *hwmon_dev;
 118         struct mutex update_lock;
 119         char valid;             /* 0 until following fields are valid */
 120         unsigned long last_updated;     /* In jiffies */
 121
 122         /* register values */
 123         u8 revision;            /* revision of chip */
 124         u8 global_event;        /* global event status */
 125         u8 global_control;      /* global control register */
 126         u8 wdog_control;        /* watchdog control */
 127         u8 wdog_state;          /* watchdog status */
 128         u8 wdog_preset;         /* watchdog preset */
 129         u8 volt[3];             /* 12, 5, battery current */
 130         u8 temp_act[3];         /* temperature */
 131         u8 temp_status[3];      /* status of sensor */
 132         u8 fan_act[3];          /* fans revolutions per second */
 133         u8 fan_status[3];       /* fan status */
 134         u8 pwm[2];              /* fan min value for rps */
 135         u8 fan_ripple[3];       /* divider for rps */
 136 };
 137
 138 /* Temperature */
 139 #define TEMP_FROM_REG(val)      (((val) - 128) * 1000)
 140
 141 static ssize_t show_temp_input(struct fscpos_data *data, char *buf, int nr)
 142 {
 143         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_act[nr - 1]));
 144 }
 145
 146 static ssize_t show_temp_status(struct fscpos_data *data, char *buf, int nr)
 147 {
 148         /* bits 2..7 reserved => mask with 0x03 */
 149         return sprintf(buf, "%u\n", data->temp_status[nr - 1] & 0x03);
 150 }
 151
 152 static ssize_t show_temp_reset(struct fscpos_data *data, char *buf, int nr)
 153 {
 154         return sprintf(buf, "1\n");
 155 }
 156
 157 static ssize_t set_temp_reset(struct i2c_client *client, struct fscpos_data
 158                         *data, const char *buf, size_t count, int nr, int reg)
 159 {
 160         unsigned long v = simple_strtoul(buf, NULL, 10);
 161         if (v != 1) {
 162                 dev_err(&client->dev, "temp_reset value %ld not supported. "
 163                                         "Use 1 to reset the alarm!\n", v);
 164                 return -EINVAL;
 165         }
 166
 167         dev_info(&client->dev, "You used the temp_reset feature which has not "
 168                                 "been proplerly tested. Please report your "
 169                                 "experience to the module author.\n");
 170
 171         /* Supported value: 2 (clears the status) */
 172         fscpos_write_value(client, FSCPOS_REG_TEMP_STATE[nr - 1], 2);
 173         return count;
 174 }
 175
 176 /* Fans */
 177 #define RPM_FROM_REG(val)       ((val) * 60)
 178
 179 static ssize_t show_fan_status(struct fscpos_data *data, char *buf, int nr)
 180 {
 181         /* bits 0..1, 3..7 reserved => mask with 0x04 */
 182         return sprintf(buf, "%u\n", data->fan_status[nr - 1] & 0x04);
 183 }
 184
 185 static ssize_t show_fan_input(struct fscpos_data *data, char *buf, int nr)
 186 {
 187         return sprintf(buf, "%u\n", RPM_FROM_REG(data->fan_act[nr - 1]));
 188 }
 189
 190 static ssize_t show_fan_ripple(struct fscpos_data *data, char *buf, int nr)
 191 {
 192         /* bits 2..7 reserved => mask with 0x03 */
 193         return sprintf(buf, "%u\n", data->fan_ripple[nr - 1] & 0x03);
 194 }
 195
 196 static ssize_t set_fan_ripple(struct i2c_client *client, struct fscpos_data
 197                         *data, const char *buf, size_t count, int nr, int reg)
 198 {
 199         /* supported values: 2, 4, 8 */
 200         unsigned long v = simple_strtoul(buf, NULL, 10);
 201
 202         switch (v) {
 203                 case 2: v = 1; break;
 204                 case 4: v = 2; break;
 205                 case 8: v = 3; break;
 206         default:
 207                 dev_err(&client->dev, "fan_ripple value %ld not supported. "
 208                                         "Must be one of 2, 4 or 8!\n", v);
 209                 return -EINVAL;
 210         }
 211
 212         mutex_lock(&data->update_lock);
 213         /* bits 2..7 reserved => mask with 0x03 */
 214         data->fan_ripple[nr - 1] &= ~0x03;
 215         data->fan_ripple[nr - 1] |= v;
 216
 217         fscpos_write_value(client, reg, data->fan_ripple[nr - 1]);
 218         mutex_unlock(&data->update_lock);
 219         return count;
 220 }
 221
 222 static ssize_t show_pwm(struct fscpos_data *data, char *buf, int nr)
 223 {
 224         return sprintf(buf, "%u\n", data->pwm[nr - 1]);
 225 }
 226
 227 static ssize_t set_pwm(struct i2c_client *client, struct fscpos_data *data,
 228                                 const char *buf, size_t count, int nr, int reg)
 229 {
 230         unsigned long v = simple_strtoul(buf, NULL, 10);
 231
 232         /* Range: 0..255 */
 233         if (v < 0) v = 0;
 234         if (v > 255) v = 255;
 235
 236         mutex_lock(&data->update_lock);
 237         data->pwm[nr - 1] = v;
 238         fscpos_write_value(client, reg, data->pwm[nr - 1]);
 239         mutex_unlock(&data->update_lock);
 240         return count;
 241 }
 242
 243 static void reset_fan_alarm(struct i2c_client *client, int nr)
 244 {
 245         fscpos_write_value(client, FSCPOS_REG_FAN_STATE[nr], 4);
 246 }
 247
 248 /* Volts */
 249 #define VOLT_FROM_REG(val, mult)        ((val) * (mult) / 255)
 250
 251 static ssize_t show_volt_12(struct device *dev, struct device_attribute *attr, char *buf)
 252 {
 253         struct fscpos_data *data = fscpos_update_device(dev);
 254         return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[0], 14200));
 255 }
 256
 257 static ssize_t show_volt_5(struct device *dev, struct device_attribute *attr, char *buf)
 258 {
 259         struct fscpos_data *data = fscpos_update_device(dev);
 260         return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[1], 6600));
 261 }
 262
 263 static ssize_t show_volt_batt(struct device *dev, struct device_attribute *attr, char *buf)
 264 {
 265         struct fscpos_data *data = fscpos_update_device(dev);
 266         return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[2], 3300));
 267 }
 268
 269 /* Watchdog */
 270 static ssize_t show_wdog_control(struct fscpos_data *data, char *buf)
 271 {
 272         /* bits 0..3 reserved, bit 6 write only => mask with 0xb0 */
 273         return sprintf(buf, "%u\n", data->wdog_control & 0xb0);
 274 }
 275
 276 static ssize_t set_wdog_control(struct i2c_client *client, struct fscpos_data
 277                                 *data, const char *buf, size_t count, int reg)
 278 {
 279         /* bits 0..3 reserved => mask with 0xf0 */
 280         unsigned long v = simple_strtoul(buf, NULL, 10) & 0xf0;
 281
 282         mutex_lock(&data->update_lock);
 283         data->wdog_control &= ~0xf0;
 284         data->wdog_control |= v;
 285         fscpos_write_value(client, reg, data->wdog_control);
 286         mutex_unlock(&data->update_lock);
 287         return count;
 288 }
 289
 290 static ssize_t show_wdog_state(struct fscpos_data *data, char *buf)
 291 {
 292         /* bits 0, 2..7 reserved => mask with 0x02 */
 293         return sprintf(buf, "%u\n", data->wdog_state & 0x02);
 294 }
 295
 296 static ssize_t set_wdog_state(struct i2c_client *client, struct fscpos_data
 297                                 *data, const char *buf, size_t count, int reg)
 298 {
 299         unsigned long v = simple_strtoul(buf, NULL, 10) & 0x02;
 300
 301         /* Valid values: 2 (clear) */
 302         if (v != 2) {
 303                 dev_err(&client->dev, "wdog_state value %ld not supported. "
 304                                         "Must be 2 to clear the state!\n", v);
 305                 return -EINVAL;
 306         }
 307
 308         mutex_lock(&data->update_lock);
 309         data->wdog_state &= ~v;
 310         fscpos_write_value(client, reg, v);
 311         mutex_unlock(&data->update_lock);
 312         return count;
 313 }
 314
 315 static ssize_t show_wdog_preset(struct fscpos_data *data, char *buf)
 316 {
 317         return sprintf(buf, "%u\n", data->wdog_preset);
 318 }
 319
 320 static ssize_t set_wdog_preset(struct i2c_client *client, struct fscpos_data
 321                                 *data, const char *buf, size_t count, int reg)
 322 {
 323         unsigned long v = simple_strtoul(buf, NULL, 10) & 0xff;
 324
 325         mutex_lock(&data->update_lock);
 326         data->wdog_preset = v;
 327         fscpos_write_value(client, reg, data->wdog_preset);
 328         mutex_unlock(&data->update_lock);
 329         return count;
 330 }
 331
 332 /* Event */
 333 static ssize_t show_event(struct device *dev, struct device_attribute *attr, char *buf)
 334 {
 335         /* bits 5..7 reserved => mask with 0x1f */
 336         struct fscpos_data *data = fscpos_update_device(dev);
 337         return sprintf(buf, "%u\n", data->global_event & 0x9b);
 338 }
 339
 340 /*
 341  * Sysfs stuff
 342  */
 343 #define create_getter(kind, sub) \
 344         static ssize_t sysfs_show_##kind##sub(struct device *dev, struct device_attribute *attr, char *buf) \
 345         { \
 346                 struct fscpos_data *data = fscpos_update_device(dev); \
 347                 return show_##kind##sub(data, buf); \
 348         }
 349
 350 #define create_getter_n(kind, offset, sub) \
 351         static ssize_t sysfs_show_##kind##offset##sub(struct device *dev, struct device_attribute *attr, char\
 352                                                                         *buf) \
 353         { \
 354                 struct fscpos_data *data = fscpos_update_device(dev); \
 355                 return show_##kind##sub(data, buf, offset); \
 356         }
 357
 358 #define create_setter(kind, sub, reg) \
 359         static ssize_t sysfs_set_##kind##sub (struct device *dev, struct device_attribute *attr, const char \
 360                                                         *buf, size_t count) \
 361         { \
 362                 struct i2c_client *client = to_i2c_client(dev); \
 363                 struct fscpos_data *data = i2c_get_clientdata(client); \
 364                 return set_##kind##sub(client, data, buf, count, reg); \
 365         }
 366
 367 #define create_setter_n(kind, offset, sub, reg) \
 368         static ssize_t sysfs_set_##kind##offset##sub (struct device *dev, struct device_attribute *attr, \
 369                                         const char *buf, size_t count) \
 370         { \
 371                 struct i2c_client *client = to_i2c_client(dev); \
 372                 struct fscpos_data *data = i2c_get_clientdata(client); \
 373                 return set_##kind##sub(client, data, buf, count, offset, reg);\
 374         }
 375
 376 #define create_sysfs_device_ro(kind, sub, offset) \
 377         static DEVICE_ATTR(kind##offset##sub, S_IRUGO, \
 378                                         sysfs_show_##kind##offset##sub, NULL);
 379
 380 #define create_sysfs_device_rw(kind, sub, offset) \
 381         static DEVICE_ATTR(kind##offset##sub, S_IRUGO | S_IWUSR, \
 382                 sysfs_show_##kind##offset##sub, sysfs_set_##kind##offset##sub);
 383
 384 #define sysfs_ro_n(kind, sub, offset) \
 385         create_getter_n(kind, offset, sub); \
 386         create_sysfs_device_ro(kind, sub, offset);
 387
 388 #define sysfs_rw_n(kind, sub, offset, reg) \
 389         create_getter_n(kind, offset, sub); \
 390         create_setter_n(kind, offset, sub, reg); \
 391         create_sysfs_device_rw(kind, sub, offset);
 392
 393 #define sysfs_rw(kind, sub, reg) \
 394         create_getter(kind, sub); \
 395         create_setter(kind, sub, reg); \
 396         create_sysfs_device_rw(kind, sub,);
 397
 398 #define sysfs_fan_with_min(offset, reg_status, reg_ripple, reg_min) \
 399         sysfs_fan(offset, reg_status, reg_ripple); \
 400         sysfs_rw_n(pwm,, offset, reg_min);
 401
 402 #define sysfs_fan(offset, reg_status, reg_ripple) \
 403         sysfs_ro_n(fan, _input, offset); \
 404         sysfs_ro_n(fan, _status, offset); \
 405         sysfs_rw_n(fan, _ripple, offset, reg_ripple);
 406
 407 #define sysfs_temp(offset, reg_status) \
 408         sysfs_ro_n(temp, _input, offset); \
 409         sysfs_ro_n(temp, _status, offset); \
 410         sysfs_rw_n(temp, _reset, offset, reg_status);
 411
 412 #define sysfs_watchdog(reg_wdog_preset, reg_wdog_state, reg_wdog_control) \
 413         sysfs_rw(wdog, _control, reg_wdog_control); \
 414         sysfs_rw(wdog, _preset, reg_wdog_preset); \
 415         sysfs_rw(wdog, _state, reg_wdog_state);
 416
 417 sysfs_fan_with_min(1, FSCPOS_REG_FAN_STATE[0], FSCPOS_REG_FAN_RIPPLE[0],
 418                                                         FSCPOS_REG_PWM[0]);
 419 sysfs_fan_with_min(2, FSCPOS_REG_FAN_STATE[1], FSCPOS_REG_FAN_RIPPLE[1],
 420                                                         FSCPOS_REG_PWM[1]);
 421 sysfs_fan(3, FSCPOS_REG_FAN_STATE[2], FSCPOS_REG_FAN_RIPPLE[2]);
 422
 423 sysfs_temp(1, FSCPOS_REG_TEMP_STATE[0]);
 424 sysfs_temp(2, FSCPOS_REG_TEMP_STATE[1]);
 425 sysfs_temp(3, FSCPOS_REG_TEMP_STATE[2]);
 426
 427 sysfs_watchdog(FSCPOS_REG_WDOG_PRESET, FSCPOS_REG_WDOG_STATE,
 428                                                 FSCPOS_REG_WDOG_CONTROL);
 429
 430 static DEVICE_ATTR(event, S_IRUGO, show_event, NULL);
 431 static DEVICE_ATTR(in0_input, S_IRUGO, show_volt_12, NULL);
 432 static DEVICE_ATTR(in1_input, S_IRUGO, show_volt_5, NULL);
 433 static DEVICE_ATTR(in2_input, S_IRUGO, show_volt_batt, NULL);
 434
 435 static struct attribute *fscpos_attributes[] = {
 436         &dev_attr_event.attr,
 437         &dev_attr_in0_input.attr,
 438         &dev_attr_in1_input.attr,
 439         &dev_attr_in2_input.attr,
 440
 441         &dev_attr_wdog_control.attr,
 442         &dev_attr_wdog_preset.attr,
 443         &dev_attr_wdog_state.attr,
 444
 445         &dev_attr_temp1_input.attr,
 446         &dev_attr_temp1_status.attr,
 447         &dev_attr_temp1_reset.attr,
 448         &dev_attr_temp2_input.attr,
 449         &dev_attr_temp2_status.attr,
 450         &dev_attr_temp2_reset.attr,
 451         &dev_attr_temp3_input.attr,
 452         &dev_attr_temp3_status.attr,
 453         &dev_attr_temp3_reset.attr,
 454
 455         &dev_attr_fan1_input.attr,
 456         &dev_attr_fan1_status.attr,
 457         &dev_attr_fan1_ripple.attr,
 458         &dev_attr_pwm1.attr,
 459         &dev_attr_fan2_input.attr,
 460         &dev_attr_fan2_status.attr,
 461         &dev_attr_fan2_ripple.attr,
 462         &dev_attr_pwm2.attr,
 463         &dev_attr_fan3_input.attr,
 464         &dev_attr_fan3_status.attr,
 465         &dev_attr_fan3_ripple.attr,
 466         NULL
 467 };
 468
 469 static const struct attribute_group fscpos_group = {
 470         .attrs = fscpos_attributes,
 471 };
 472
 473 static int fscpos_attach_adapter(struct i2c_adapter *adapter)
 474 {
 475         if (!(adapter->class & I2C_CLASS_HWMON))
 476                 return 0;
 477         return i2c_probe(adapter, &addr_data, fscpos_detect);
 478 }
 479
 480 static int fscpos_detect(struct i2c_adapter *adapter, int address, int kind)
 481 {
 482         struct i2c_client *new_client;
 483         struct fscpos_data *data;
 484         int err = 0;
 485
 486         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 487                 goto exit;
 488
 489         /*
 490          * OK. For now, we presume we have a valid client. We now create the
 491          * client structure, even though we cannot fill it completely yet.
 492          * But it allows us to access fscpos_{read,write}_value.
 493          */
 494
 495         if (!(data = kzalloc(sizeof(struct fscpos_data), GFP_KERNEL))) {
 496                 err = -ENOMEM;
 497                 goto exit;
 498         }
 499
 500         new_client = &data->client;
 501         i2c_set_clientdata(new_client, data);
 502         new_client->addr = address;
 503         new_client->adapter = adapter;
 504         new_client->driver = &fscpos_driver;
 505         new_client->flags = 0;
 506
 507         /* Do the remaining detection unless force or force_fscpos parameter */
 508         if (kind < 0) {
 509                 if ((fscpos_read_value(new_client, FSCPOS_REG_IDENT_0)
 510                         != 0x50) /* 'P' */
 511                 || (fscpos_read_value(new_client, FSCPOS_REG_IDENT_1)
 512                         != 0x45) /* 'E' */
 513                 || (fscpos_read_value(new_client, FSCPOS_REG_IDENT_2)
 514                         != 0x47))/* 'G' */
 515                 {
 516                         dev_dbg(&new_client->dev, "fscpos detection failed\n");
 517                         goto exit_free;
 518                 }
 519         }
 520
 521         /* Fill in the remaining client fields and put it in the global list */
 522         strlcpy(new_client->name, "fscpos", I2C_NAME_SIZE);
 523
 524         data->valid = 0;
 525         mutex_init(&data->update_lock);
 526
 527         /* Tell the I2C layer a new client has arrived */
 528         if ((err = i2c_attach_client(new_client)))
 529                 goto exit_free;
 530
 531         /* Inizialize the fscpos chip */
 532         fscpos_init_client(new_client);
 533
 534         /* Announce that the chip was found */
 535         dev_info(&new_client->dev, "Found fscpos chip, rev %u\n", data->revision);
 536
 537         /* Register sysfs hooks */
 538         if ((err = sysfs_create_group(&new_client->dev.kobj, &fscpos_group)))
 539                 goto exit_detach;
 540
 541         data->hwmon_dev = hwmon_device_register(&new_client->dev);
 542         if (IS_ERR(data->hwmon_dev)) {
 543                 err = PTR_ERR(data->hwmon_dev);
 544                 goto exit_remove_files;
 545         }
 546
 547         return 0;
 548
 549 exit_remove_files:
 550         sysfs_remove_group(&new_client->dev.kobj, &fscpos_group);
 551 exit_detach:
 552         i2c_detach_client(new_client);
 553 exit_free:
 554         kfree(data);
 555 exit:
 556         return err;
 557 }
 558
 559 static int fscpos_detach_client(struct i2c_client *client)
 560 {
 561         struct fscpos_data *data = i2c_get_clientdata(client);
 562         int err;
 563
 564         hwmon_device_unregister(data->hwmon_dev);
 565         sysfs_remove_group(&client->dev.kobj, &fscpos_group);
 566
 567         if ((err = i2c_detach_client(client)))
 568                 return err;
 569         kfree(data);
 570         return 0;
 571 }
 572
 573 static int fscpos_read_value(struct i2c_client *client, u8 reg)
 574 {
 575         dev_dbg(&client->dev, "Read reg 0x%02x\n", reg);
 576         return i2c_smbus_read_byte_data(client, reg);
 577 }
 578
 579 static int fscpos_write_value(struct i2c_client *client, u8 reg, u8 value)
 580 {
 581         dev_dbg(&client->dev, "Write reg 0x%02x, val 0x%02x\n", reg, value);
 582         return i2c_smbus_write_byte_data(client, reg, value);
 583 }
 584
 585 /* Called when we have found a new FSCPOS chip */
 586 static void fscpos_init_client(struct i2c_client *client)
 587 {
 588         struct fscpos_data *data = i2c_get_clientdata(client);
 589
 590         /* read revision from chip */
 591         data->revision = fscpos_read_value(client, FSCPOS_REG_REVISION);
 592 }
 593
 594 static struct fscpos_data *fscpos_update_device(struct device *dev)
 595 {
 596         struct i2c_client *client = to_i2c_client(dev);
 597         struct fscpos_data *data = i2c_get_clientdata(client);
 598
 599         mutex_lock(&data->update_lock);
 600
 601         if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
 602                 int i;
 603
 604                 dev_dbg(&client->dev, "Starting fscpos update\n");
 605
 606                 for (i = 0; i < 3; i++) {
 607                         data->temp_act[i] = fscpos_read_value(client,
 608                                                 FSCPOS_REG_TEMP_ACT[i]);
 609                         data->temp_status[i] = fscpos_read_value(client,
 610                                                 FSCPOS_REG_TEMP_STATE[i]);
 611                         data->fan_act[i] = fscpos_read_value(client,
 612                                                 FSCPOS_REG_FAN_ACT[i]);
 613                         data->fan_status[i] = fscpos_read_value(client,
 614                                                 FSCPOS_REG_FAN_STATE[i]);
 615                         data->fan_ripple[i] = fscpos_read_value(client,
 616                                                 FSCPOS_REG_FAN_RIPPLE[i]);
 617                         if (i < 2) {
 618                                 /* fan2_min is not supported by the chip */
 619                                 data->pwm[i] = fscpos_read_value(client,
 620                                                         FSCPOS_REG_PWM[i]);
 621                         }
 622                         /* reset fan status if speed is back to > 0 */
 623                         if (data->fan_status[i] != 0 && data->fan_act[i] > 0) {
 624                                 reset_fan_alarm(client, i);
 625                         }
 626                 }
 627
 628                 data->volt[0] = fscpos_read_value(client, FSCPOS_REG_VOLT_12);
 629                 data->volt[1] = fscpos_read_value(client, FSCPOS_REG_VOLT_5);
 630                 data->volt[2] = fscpos_read_value(client, FSCPOS_REG_VOLT_BATT);
 631
 632                 data->wdog_preset = fscpos_read_value(client,
 633                                                         FSCPOS_REG_WDOG_PRESET);
 634                 data->wdog_state = fscpos_read_value(client,
 635                                                         FSCPOS_REG_WDOG_STATE);
 636                 data->wdog_control = fscpos_read_value(client,
 637                                                 FSCPOS_REG_WDOG_CONTROL);
 638
 639                 data->global_event = fscpos_read_value(client,
 640                                                 FSCPOS_REG_EVENT_STATE);
 641
 642                 data->last_updated = jiffies;
 643                 data->valid = 1;
 644         }
 645         mutex_unlock(&data->update_lock);
 646         return data;
 647 }
 648
 649 static int __init sm_fscpos_init(void)
 650 {
 651         return i2c_add_driver(&fscpos_driver);
 652 }
 653
 654 static void __exit sm_fscpos_exit(void)
 655 {
 656         i2c_del_driver(&fscpos_driver);
 657 }
 658
 659 MODULE_AUTHOR("Stefan Ott <stefan@desire.ch> based on work from Hermann Jung "
 660                                 "<hej@odn.de>, Frodo Looijaard <frodol@dds.nl>"
 661                                 " and Philip Edelbrock <phil@netroedge.com>");
 662 MODULE_DESCRIPTION("fujitsu siemens poseidon chip driver");
 663 MODULE_LICENSE("GPL");
 664
 665 module_init(sm_fscpos_init);
 666 module_exit(sm_fscpos_exit);