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   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/i2c-sensor.h>
  38 #include <linux/init.h>
  39
  40 /*
  41  * Addresses to scan
  42  */
  43 static unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END };
  44 static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
  45
  46 /*
  47  * Insmod parameters
  48  */
  49 SENSORS_INSMOD_1(fscpos);
  50
  51 /*
  52  * The FSCPOS registers
  53  */
  54
  55 /* chip identification */
  56 #define FSCPOS_REG_IDENT_0              0x00
  57 #define FSCPOS_REG_IDENT_1              0x01
  58 #define FSCPOS_REG_IDENT_2              0x02
  59 #define FSCPOS_REG_REVISION             0x03
  60
  61 /* global control and status */
  62 #define FSCPOS_REG_EVENT_STATE          0x04
  63 #define FSCPOS_REG_CONTROL              0x05
  64
  65 /* watchdog */
  66 #define FSCPOS_REG_WDOG_PRESET          0x28
  67 #define FSCPOS_REG_WDOG_STATE           0x23
  68 #define FSCPOS_REG_WDOG_CONTROL         0x21
  69
  70 /* voltages */
  71 #define FSCPOS_REG_VOLT_12              0x45
  72 #define FSCPOS_REG_VOLT_5               0x42
  73 #define FSCPOS_REG_VOLT_BATT            0x48
  74
  75 /* fans - the chip does not support minimum speed for fan2 */
  76 static u8 FSCPOS_REG_PWM[] = { 0x55, 0x65 };
  77 static u8 FSCPOS_REG_FAN_ACT[] = { 0x0e, 0x6b, 0xab };
  78 static u8 FSCPOS_REG_FAN_STATE[] = { 0x0d, 0x62, 0xa2 };
  79 static u8 FSCPOS_REG_FAN_RIPPLE[] = { 0x0f, 0x6f, 0xaf };
  80
  81 /* temperatures */
  82 static u8 FSCPOS_REG_TEMP_ACT[] = { 0x64, 0x32, 0x35 };
  83 static u8 FSCPOS_REG_TEMP_STATE[] = { 0x71, 0x81, 0x91 };
  84
  85 /*
  86  * Functions declaration
  87  */
  88 static int fscpos_attach_adapter(struct i2c_adapter *adapter);
  89 static int fscpos_detect(struct i2c_adapter *adapter, int address, int kind);
  90 static int fscpos_detach_client(struct i2c_client *client);
  91
  92 static int fscpos_read_value(struct i2c_client *client, u8 register);
  93 static int fscpos_write_value(struct i2c_client *client, u8 register, u8 value);
  94 static struct fscpos_data *fscpos_update_device(struct device *dev);
  95 static void fscpos_init_client(struct i2c_client *client);
  96
  97 static void reset_fan_alarm(struct i2c_client *client, int nr);
  98
  99 /*
 100  * Driver data (common to all clients)
 101  */
 102 static struct i2c_driver fscpos_driver = {
 103         .owner          = THIS_MODULE,
 104         .name           = "fscpos",
 105         .id             = I2C_DRIVERID_FSCPOS,
 106         .flags          = I2C_DF_NOTIFY,
 107         .attach_adapter = fscpos_attach_adapter,
 108         .detach_client  = fscpos_detach_client,
 109 };
 110
 111 /*
 112  * Client data (each client gets its own)
 113  */
 114 struct fscpos_data {
 115         struct i2c_client client;
 116         struct semaphore update_lock;
 117         char valid;             /* 0 until following fields are valid */
 118         unsigned long last_updated;     /* In jiffies */
 119
 120         /* register values */
 121         u8 revision;            /* revision of chip */
 122         u8 global_event;        /* global event status */
 123         u8 global_control;      /* global control register */
 124         u8 wdog_control;        /* watchdog control */
 125         u8 wdog_state;          /* watchdog status */
 126         u8 wdog_preset;         /* watchdog preset */
 127         u8 volt[3];             /* 12, 5, battery current */
 128         u8 temp_act[3];         /* temperature */
 129         u8 temp_status[3];      /* status of sensor */
 130         u8 fan_act[3];          /* fans revolutions per second */
 131         u8 fan_status[3];       /* fan status */
 132         u8 pwm[2];              /* fan min value for rps */
 133         u8 fan_ripple[3];       /* divider for rps */
 134 };
 135
 136 /* Temperature */
 137 #define TEMP_FROM_REG(val)      (((val) - 128) * 1000)
 138
 139 static ssize_t show_temp_input(struct fscpos_data *data, char *buf, int nr)
 140 {
 141         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_act[nr - 1]));
 142 }
 143
 144 static ssize_t show_temp_status(struct fscpos_data *data, char *buf, int nr)
 145 {
 146         /* bits 2..7 reserved => mask with 0x03 */
 147         return sprintf(buf, "%u\n", data->temp_status[nr - 1] & 0x03);
 148 }
 149
 150 static ssize_t show_temp_reset(struct fscpos_data *data, char *buf, int nr)
 151 {
 152         return sprintf(buf, "1\n");
 153 }
 154
 155 static ssize_t set_temp_reset(struct i2c_client *client, struct fscpos_data
 156                         *data, const char *buf, size_t count, int nr, int reg)
 157 {
 158         unsigned long v = simple_strtoul(buf, NULL, 10);
 159         if (v != 1) {
 160                 dev_err(&client->dev, "temp_reset value %ld not supported. "
 161                                         "Use 1 to reset the alarm!\n", v);
 162                 return -EINVAL;
 163         }
 164
 165         dev_info(&client->dev, "You used the temp_reset feature which has not "
 166                                 "been proplerly tested. Please report your "
 167                                 "experience to the module author.\n");
 168
 169         /* Supported value: 2 (clears the status) */
 170         fscpos_write_value(client, FSCPOS_REG_TEMP_STATE[nr - 1], 2);
 171         return count;
 172 }
 173
 174 /* Fans */
 175 #define RPM_FROM_REG(val)       ((val) * 60)
 176
 177 static ssize_t show_fan_status(struct fscpos_data *data, char *buf, int nr)
 178 {
 179         /* bits 0..1, 3..7 reserved => mask with 0x04 */
 180         return sprintf(buf, "%u\n", data->fan_status[nr - 1] & 0x04);
 181 }
 182
 183 static ssize_t show_fan_input(struct fscpos_data *data, char *buf, int nr)
 184 {
 185         return sprintf(buf, "%u\n", RPM_FROM_REG(data->fan_act[nr - 1]));
 186 }
 187
 188 static ssize_t show_fan_ripple(struct fscpos_data *data, char *buf, int nr)
 189 {
 190         /* bits 2..7 reserved => mask with 0x03 */
 191         return sprintf(buf, "%u\n", data->fan_ripple[nr - 1] & 0x03);
 192 }
 193
 194 static ssize_t set_fan_ripple(struct i2c_client *client, struct fscpos_data
 195                         *data, const char *buf, size_t count, int nr, int reg)
 196 {
 197         /* supported values: 2, 4, 8 */
 198         unsigned long v = simple_strtoul(buf, NULL, 10);
 199
 200         switch (v) {
 201                 case 2: v = 1; break;
 202                 case 4: v = 2; break;
 203                 case 8: v = 3; break;
 204         default:
 205                 dev_err(&client->dev, "fan_ripple value %ld not supported. "
 206                                         "Must be one of 2, 4 or 8!\n", v);
 207                 return -EINVAL;
 208         }
 209
 210         down(&data->update_lock);
 211         /* bits 2..7 reserved => mask with 0x03 */
 212         data->fan_ripple[nr - 1] &= ~0x03;
 213         data->fan_ripple[nr - 1] |= v;
 214
 215         fscpos_write_value(client, reg, data->fan_ripple[nr - 1]);
 216         up(&data->update_lock);
 217         return count;
 218 }
 219
 220 static ssize_t show_pwm(struct fscpos_data *data, char *buf, int nr)
 221 {
 222         return sprintf(buf, "%u\n", data->pwm[nr - 1]);
 223 }
 224
 225 static ssize_t set_pwm(struct i2c_client *client, struct fscpos_data *data,
 226                                 const char *buf, size_t count, int nr, int reg)
 227 {
 228         unsigned long v = simple_strtoul(buf, NULL, 10);
 229
 230         /* Range: 0..255 */
 231         if (v < 0) v = 0;
 232         if (v > 255) v = 255;
 233
 234         down(&data->update_lock);
 235         data->pwm[nr - 1] = v;
 236         fscpos_write_value(client, reg, data->pwm[nr - 1]);
 237         up(&data->update_lock);
 238         return count;
 239 }
 240
 241 static void reset_fan_alarm(struct i2c_client *client, int nr)
 242 {
 243         fscpos_write_value(client, FSCPOS_REG_FAN_STATE[nr], 4);
 244 }
 245
 246 /* Volts */
 247 #define VOLT_FROM_REG(val, mult)        ((val) * (mult) / 255)
 248
 249 static ssize_t show_volt_12(struct device *dev, struct device_attribute *attr, char *buf)
 250 {
 251         struct fscpos_data *data = fscpos_update_device(dev);
 252         return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[0], 14200));
 253 }
 254
 255 static ssize_t show_volt_5(struct device *dev, struct device_attribute *attr, char *buf)
 256 {
 257         struct fscpos_data *data = fscpos_update_device(dev);
 258         return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[1], 6600));
 259 }
 260
 261 static ssize_t show_volt_batt(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[2], 3300));
 265 }
 266
 267 /* Watchdog */
 268 static ssize_t show_wdog_control(struct fscpos_data *data, char *buf)
 269 {
 270         /* bits 0..3 reserved, bit 6 write only => mask with 0xb0 */
 271         return sprintf(buf, "%u\n", data->wdog_control & 0xb0);
 272 }
 273
 274 static ssize_t set_wdog_control(struct i2c_client *client, struct fscpos_data
 275                                 *data, const char *buf, size_t count, int reg)
 276 {
 277         /* bits 0..3 reserved => mask with 0xf0 */
 278         unsigned long v = simple_strtoul(buf, NULL, 10) & 0xf0;
 279
 280         down(&data->update_lock);
 281         data->wdog_control &= ~0xf0;
 282         data->wdog_control |= v;
 283         fscpos_write_value(client, reg, data->wdog_control);
 284         up(&data->update_lock);
 285         return count;
 286 }
 287
 288 static ssize_t show_wdog_state(struct fscpos_data *data, char *buf)
 289 {
 290         /* bits 0, 2..7 reserved => mask with 0x02 */
 291         return sprintf(buf, "%u\n", data->wdog_state & 0x02);
 292 }
 293
 294 static ssize_t set_wdog_state(struct i2c_client *client, struct fscpos_data
 295                                 *data, const char *buf, size_t count, int reg)
 296 {
 297         unsigned long v = simple_strtoul(buf, NULL, 10) & 0x02;
 298
 299         /* Valid values: 2 (clear) */
 300         if (v != 2) {
 301                 dev_err(&client->dev, "wdog_state value %ld not supported. "
 302                                         "Must be 2 to clear the state!\n", v);
 303                 return -EINVAL;
 304         }
 305
 306         down(&data->update_lock);
 307         data->wdog_state &= ~v;
 308         fscpos_write_value(client, reg, v);
 309         up(&data->update_lock);
 310         return count;
 311 }
 312
 313 static ssize_t show_wdog_preset(struct fscpos_data *data, char *buf)
 314 {
 315         return sprintf(buf, "%u\n", data->wdog_preset);
 316 }
 317
 318 static ssize_t set_wdog_preset(struct i2c_client *client, struct fscpos_data
 319                                 *data, const char *buf, size_t count, int reg)
 320 {
 321         unsigned long v = simple_strtoul(buf, NULL, 10) & 0xff;
 322
 323         down(&data->update_lock);
 324         data->wdog_preset = v;
 325         fscpos_write_value(client, reg, data->wdog_preset);
 326         up(&data->update_lock);
 327         return count;
 328 }
 329
 330 /* Event */
 331 static ssize_t show_event(struct device *dev, struct device_attribute *attr, char *buf)
 332 {
 333         /* bits 5..7 reserved => mask with 0x1f */
 334         struct fscpos_data *data = fscpos_update_device(dev);
 335         return sprintf(buf, "%u\n", data->global_event & 0x9b);
 336 }
 337
 338 /*
 339  * Sysfs stuff
 340  */
 341 #define create_getter(kind, sub) \
 342         static ssize_t sysfs_show_##kind##sub(struct device *dev, struct device_attribute *attr, char *buf) \
 343         { \
 344                 struct fscpos_data *data = fscpos_update_device(dev); \
 345                 return show_##kind##sub(data, buf); \
 346         }
 347
 348 #define create_getter_n(kind, offset, sub) \
 349         static ssize_t sysfs_show_##kind##offset##sub(struct device *dev, struct device_attribute *attr, char\
 350                                                                         *buf) \
 351         { \
 352                 struct fscpos_data *data = fscpos_update_device(dev); \
 353                 return show_##kind##sub(data, buf, offset); \
 354         }
 355
 356 #define create_setter(kind, sub, reg) \
 357         static ssize_t sysfs_set_##kind##sub (struct device *dev, struct device_attribute *attr, const char \
 358                                                         *buf, size_t count) \
 359         { \
 360                 struct i2c_client *client = to_i2c_client(dev); \
 361                 struct fscpos_data *data = i2c_get_clientdata(client); \
 362                 return set_##kind##sub(client, data, buf, count, reg); \
 363         }
 364
 365 #define create_setter_n(kind, offset, sub, reg) \
 366         static ssize_t sysfs_set_##kind##offset##sub (struct device *dev, struct device_attribute *attr, \
 367                                         const char *buf, size_t count) \
 368         { \
 369                 struct i2c_client *client = to_i2c_client(dev); \
 370                 struct fscpos_data *data = i2c_get_clientdata(client); \
 371                 return set_##kind##sub(client, data, buf, count, offset, reg);\
 372         }
 373
 374 #define create_sysfs_device_ro(kind, sub, offset) \
 375         static DEVICE_ATTR(kind##offset##sub, S_IRUGO, \
 376                                         sysfs_show_##kind##offset##sub, NULL);
 377
 378 #define create_sysfs_device_rw(kind, sub, offset) \
 379         static DEVICE_ATTR(kind##offset##sub, S_IRUGO | S_IWUSR, \
 380                 sysfs_show_##kind##offset##sub, sysfs_set_##kind##offset##sub);
 381
 382 #define sysfs_ro_n(kind, sub, offset) \
 383         create_getter_n(kind, offset, sub); \
 384         create_sysfs_device_ro(kind, sub, offset);
 385
 386 #define sysfs_rw_n(kind, sub, offset, reg) \
 387         create_getter_n(kind, offset, sub); \
 388         create_setter_n(kind, offset, sub, reg); \
 389         create_sysfs_device_rw(kind, sub, offset);
 390
 391 #define sysfs_rw(kind, sub, reg) \
 392         create_getter(kind, sub); \
 393         create_setter(kind, sub, reg); \
 394         create_sysfs_device_rw(kind, sub,);
 395
 396 #define sysfs_fan_with_min(offset, reg_status, reg_ripple, reg_min) \
 397         sysfs_fan(offset, reg_status, reg_ripple); \
 398         sysfs_rw_n(pwm,, offset, reg_min);
 399
 400 #define sysfs_fan(offset, reg_status, reg_ripple) \
 401         sysfs_ro_n(fan, _input, offset); \
 402         sysfs_ro_n(fan, _status, offset); \
 403         sysfs_rw_n(fan, _ripple, offset, reg_ripple);
 404
 405 #define sysfs_temp(offset, reg_status) \
 406         sysfs_ro_n(temp, _input, offset); \
 407         sysfs_ro_n(temp, _status, offset); \
 408         sysfs_rw_n(temp, _reset, offset, reg_status);
 409
 410 #define sysfs_watchdog(reg_wdog_preset, reg_wdog_state, reg_wdog_control) \
 411         sysfs_rw(wdog, _control, reg_wdog_control); \
 412         sysfs_rw(wdog, _preset, reg_wdog_preset); \
 413         sysfs_rw(wdog, _state, reg_wdog_state);
 414
 415 sysfs_fan_with_min(1, FSCPOS_REG_FAN_STATE[0], FSCPOS_REG_FAN_RIPPLE[0],
 416                                                         FSCPOS_REG_PWM[0]);
 417 sysfs_fan_with_min(2, FSCPOS_REG_FAN_STATE[1], FSCPOS_REG_FAN_RIPPLE[1],
 418                                                         FSCPOS_REG_PWM[1]);
 419 sysfs_fan(3, FSCPOS_REG_FAN_STATE[2], FSCPOS_REG_FAN_RIPPLE[2]);
 420
 421 sysfs_temp(1, FSCPOS_REG_TEMP_STATE[0]);
 422 sysfs_temp(2, FSCPOS_REG_TEMP_STATE[1]);
 423 sysfs_temp(3, FSCPOS_REG_TEMP_STATE[2]);
 424
 425 sysfs_watchdog(FSCPOS_REG_WDOG_PRESET, FSCPOS_REG_WDOG_STATE,
 426                                                 FSCPOS_REG_WDOG_CONTROL);
 427
 428 static DEVICE_ATTR(event, S_IRUGO, show_event, NULL);
 429 static DEVICE_ATTR(in0_input, S_IRUGO, show_volt_12, NULL);
 430 static DEVICE_ATTR(in1_input, S_IRUGO, show_volt_5, NULL);
 431 static DEVICE_ATTR(in2_input, S_IRUGO, show_volt_batt, NULL);
 432
 433 static int fscpos_attach_adapter(struct i2c_adapter *adapter)
 434 {
 435         if (!(adapter->class & I2C_CLASS_HWMON))
 436                 return 0;
 437         return i2c_detect(adapter, &addr_data, fscpos_detect);
 438 }
 439
 440 int fscpos_detect(struct i2c_adapter *adapter, int address, int kind)
 441 {
 442         struct i2c_client *new_client;
 443         struct fscpos_data *data;
 444         int err = 0;
 445
 446         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 447                 goto exit;
 448
 449         /*
 450          * OK. For now, we presume we have a valid client. We now create the
 451          * client structure, even though we cannot fill it completely yet.
 452          * But it allows us to access fscpos_{read,write}_value.
 453          */
 454
 455         if (!(data = kmalloc(sizeof(struct fscpos_data), GFP_KERNEL))) {
 456                 err = -ENOMEM;
 457                 goto exit;
 458         }
 459         memset(data, 0, sizeof(struct fscpos_data));
 460
 461         new_client = &data->client;
 462         i2c_set_clientdata(new_client, data);
 463         new_client->addr = address;
 464         new_client->adapter = adapter;
 465         new_client->driver = &fscpos_driver;
 466         new_client->flags = 0;
 467
 468         /* Do the remaining detection unless force or force_fscpos parameter */
 469         if (kind < 0) {
 470                 if ((fscpos_read_value(new_client, FSCPOS_REG_IDENT_0)
 471                         != 0x50) /* 'P' */
 472                 || (fscpos_read_value(new_client, FSCPOS_REG_IDENT_1)
 473                         != 0x45) /* 'E' */
 474                 || (fscpos_read_value(new_client, FSCPOS_REG_IDENT_2)
 475                         != 0x47))/* 'G' */
 476                 {
 477                         dev_dbg(&new_client->dev, "fscpos detection failed\n");
 478                         goto exit_free;
 479                 }
 480         }
 481
 482         /* Fill in the remaining client fields and put it in the global list */
 483         strlcpy(new_client->name, "fscpos", I2C_NAME_SIZE);
 484
 485         data->valid = 0;
 486         init_MUTEX(&data->update_lock);
 487
 488         /* Tell the I2C layer a new client has arrived */
 489         if ((err = i2c_attach_client(new_client)))
 490                 goto exit_free;
 491
 492         /* Inizialize the fscpos chip */
 493         fscpos_init_client(new_client);
 494
 495         /* Announce that the chip was found */
 496         dev_info(&new_client->dev, "Found fscpos chip, rev %u\n", data->revision);
 497
 498         /* Register sysfs hooks */
 499         device_create_file(&new_client->dev, &dev_attr_event);
 500         device_create_file(&new_client->dev, &dev_attr_in0_input);
 501         device_create_file(&new_client->dev, &dev_attr_in1_input);
 502         device_create_file(&new_client->dev, &dev_attr_in2_input);
 503         device_create_file(&new_client->dev, &dev_attr_wdog_control);
 504         device_create_file(&new_client->dev, &dev_attr_wdog_preset);
 505         device_create_file(&new_client->dev, &dev_attr_wdog_state);
 506         device_create_file(&new_client->dev, &dev_attr_temp1_input);
 507         device_create_file(&new_client->dev, &dev_attr_temp1_status);
 508         device_create_file(&new_client->dev, &dev_attr_temp1_reset);
 509         device_create_file(&new_client->dev, &dev_attr_temp2_input);
 510         device_create_file(&new_client->dev, &dev_attr_temp2_status);
 511         device_create_file(&new_client->dev, &dev_attr_temp2_reset);
 512         device_create_file(&new_client->dev, &dev_attr_temp3_input);
 513         device_create_file(&new_client->dev, &dev_attr_temp3_status);
 514         device_create_file(&new_client->dev, &dev_attr_temp3_reset);
 515         device_create_file(&new_client->dev, &dev_attr_fan1_input);
 516         device_create_file(&new_client->dev, &dev_attr_fan1_status);
 517         device_create_file(&new_client->dev, &dev_attr_fan1_ripple);
 518         device_create_file(&new_client->dev, &dev_attr_pwm1);
 519         device_create_file(&new_client->dev, &dev_attr_fan2_input);
 520         device_create_file(&new_client->dev, &dev_attr_fan2_status);
 521         device_create_file(&new_client->dev, &dev_attr_fan2_ripple);
 522         device_create_file(&new_client->dev, &dev_attr_pwm2);
 523         device_create_file(&new_client->dev, &dev_attr_fan3_input);
 524         device_create_file(&new_client->dev, &dev_attr_fan3_status);
 525         device_create_file(&new_client->dev, &dev_attr_fan3_ripple);
 526
 527         return 0;
 528
 529 exit_free:
 530         kfree(data);
 531 exit:
 532         return err;
 533 }
 534
 535 static int fscpos_detach_client(struct i2c_client *client)
 536 {
 537         int err;
 538
 539         if ((err = i2c_detach_client(client))) {
 540                 dev_err(&client->dev, "Client deregistration failed, client"
 541                                                         " not detached.\n");
 542                 return err;
 543         }
 544         kfree(i2c_get_clientdata(client));
 545         return 0;
 546 }
 547
 548 static int fscpos_read_value(struct i2c_client *client, u8 reg)
 549 {
 550         dev_dbg(&client->dev, "Read reg 0x%02x\n", reg);
 551         return i2c_smbus_read_byte_data(client, reg);
 552 }
 553
 554 static int fscpos_write_value(struct i2c_client *client, u8 reg, u8 value)
 555 {
 556         dev_dbg(&client->dev, "Write reg 0x%02x, val 0x%02x\n", reg, value);
 557         return i2c_smbus_write_byte_data(client, reg, value);
 558 }
 559
 560 /* Called when we have found a new FSCPOS chip */
 561 static void fscpos_init_client(struct i2c_client *client)
 562 {
 563         struct fscpos_data *data = i2c_get_clientdata(client);
 564
 565         /* read revision from chip */
 566         data->revision = fscpos_read_value(client, FSCPOS_REG_REVISION);
 567 }
 568
 569 static struct fscpos_data *fscpos_update_device(struct device *dev)
 570 {
 571         struct i2c_client *client = to_i2c_client(dev);
 572         struct fscpos_data *data = i2c_get_clientdata(client);
 573
 574         down(&data->update_lock);
 575
 576         if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
 577                 int i;
 578
 579                 dev_dbg(&client->dev, "Starting fscpos update\n");
 580
 581                 for (i = 0; i < 3; i++) {
 582                         data->temp_act[i] = fscpos_read_value(client,
 583                                                 FSCPOS_REG_TEMP_ACT[i]);
 584                         data->temp_status[i] = fscpos_read_value(client,
 585                                                 FSCPOS_REG_TEMP_STATE[i]);
 586                         data->fan_act[i] = fscpos_read_value(client,
 587                                                 FSCPOS_REG_FAN_ACT[i]);
 588                         data->fan_status[i] = fscpos_read_value(client,
 589                                                 FSCPOS_REG_FAN_STATE[i]);
 590                         data->fan_ripple[i] = fscpos_read_value(client,
 591                                                 FSCPOS_REG_FAN_RIPPLE[i]);
 592                         if (i < 2) {
 593                                 /* fan2_min is not supported by the chip */
 594                                 data->pwm[i] = fscpos_read_value(client,
 595                                                         FSCPOS_REG_PWM[i]);
 596                         }
 597                         /* reset fan status if speed is back to > 0 */
 598                         if (data->fan_status[i] != 0 && data->fan_act[i] > 0) {
 599                                 reset_fan_alarm(client, i);
 600                         }
 601                 }
 602
 603                 data->volt[0] = fscpos_read_value(client, FSCPOS_REG_VOLT_12);
 604                 data->volt[1] = fscpos_read_value(client, FSCPOS_REG_VOLT_5);
 605                 data->volt[2] = fscpos_read_value(client, FSCPOS_REG_VOLT_BATT);
 606
 607                 data->wdog_preset = fscpos_read_value(client,
 608                                                         FSCPOS_REG_WDOG_PRESET);
 609                 data->wdog_state = fscpos_read_value(client,
 610                                                         FSCPOS_REG_WDOG_STATE);
 611                 data->wdog_control = fscpos_read_value(client,
 612                                                 FSCPOS_REG_WDOG_CONTROL);
 613
 614                 data->global_event = fscpos_read_value(client,
 615                                                 FSCPOS_REG_EVENT_STATE);
 616
 617                 data->last_updated = jiffies;
 618                 data->valid = 1;
 619         }
 620         up(&data->update_lock);
 621         return data;
 622 }
 623
 624 static int __init sm_fscpos_init(void)
 625 {
 626         return i2c_add_driver(&fscpos_driver);
 627 }
 628
 629 static void __exit sm_fscpos_exit(void)
 630 {
 631         i2c_del_driver(&fscpos_driver);
 632 }
 633
 634 MODULE_AUTHOR("Stefan Ott <stefan@desire.ch> based on work from Hermann Jung "
 635                                 "<hej@odn.de>, Frodo Looijaard <frodol@dds.nl>"
 636                                 " and Philip Edelbrock <phil@netroedge.com>");
 637 MODULE_DESCRIPTION("fujitsu siemens poseidon chip driver");
 638 MODULE_LICENSE("GPL");
 639
 640 module_init(sm_fscpos_init);
 641 module_exit(sm_fscpos_exit);