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/i2c.h>
  36 #include <linux/i2c-sensor.h>
  37 #include <linux/init.h>
  38
  39 /*
  40  * Addresses to scan
  41  */
  42 static unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END };
  43 static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
  44
  45 /*
  46  * Insmod parameters
  47  */
  48 SENSORS_INSMOD_1(fscpos);
  49
  50 /*
  51  * The FSCPOS registers
  52  */
  53
  54 /* chip identification */
  55 #define FSCPOS_REG_IDENT_0              0x00
  56 #define FSCPOS_REG_IDENT_1              0x01
  57 #define FSCPOS_REG_IDENT_2              0x02
  58 #define FSCPOS_REG_REVISION             0x03
  59
  60 /* global control and status */
  61 #define FSCPOS_REG_EVENT_STATE          0x04
  62 #define FSCPOS_REG_CONTROL              0x05
  63
  64 /* watchdog */
  65 #define FSCPOS_REG_WDOG_PRESET          0x28
  66 #define FSCPOS_REG_WDOG_STATE           0x23
  67 #define FSCPOS_REG_WDOG_CONTROL         0x21
  68
  69 /* voltages */
  70 #define FSCPOS_REG_VOLT_12              0x45
  71 #define FSCPOS_REG_VOLT_5               0x42
  72 #define FSCPOS_REG_VOLT_BATT            0x48
  73
  74 /* fans - the chip does not support minimum speed for fan2 */
  75 static u8 FSCPOS_REG_PWM[] = { 0x55, 0x65 };
  76 static u8 FSCPOS_REG_FAN_ACT[] = { 0x0e, 0x6b, 0xab };
  77 static u8 FSCPOS_REG_FAN_STATE[] = { 0x0d, 0x62, 0xa2 };
  78 static u8 FSCPOS_REG_FAN_RIPPLE[] = { 0x0f, 0x6f, 0xaf };
  79
  80 /* temperatures */
  81 static u8 FSCPOS_REG_TEMP_ACT[] = { 0x64, 0x32, 0x35 };
  82 static u8 FSCPOS_REG_TEMP_STATE[] = { 0x71, 0x81, 0x91 };
  83
  84 /*
  85  * Functions declaration
  86  */
  87 static int fscpos_attach_adapter(struct i2c_adapter *adapter);
  88 static int fscpos_detect(struct i2c_adapter *adapter, int address, int kind);
  89 static int fscpos_detach_client(struct i2c_client *client);
  90
  91 static int fscpos_read_value(struct i2c_client *client, u8 register);
  92 static int fscpos_write_value(struct i2c_client *client, u8 register, u8 value);
  93 static struct fscpos_data *fscpos_update_device(struct device *dev);
  94 static void fscpos_init_client(struct i2c_client *client);
  95
  96 static void reset_fan_alarm(struct i2c_client *client, int nr);
  97
  98 /*
  99  * Driver data (common to all clients)
 100  */
 101 static struct i2c_driver fscpos_driver = {
 102         .owner          = THIS_MODULE,
 103         .name           = "fscpos",
 104         .id             = I2C_DRIVERID_FSCPOS,
 105         .flags          = I2C_DF_NOTIFY,
 106         .attach_adapter = fscpos_attach_adapter,
 107         .detach_client  = fscpos_detach_client,
 108 };
 109
 110 /*
 111  * Client data (each client gets its own)
 112  */
 113 struct fscpos_data {
 114         struct i2c_client client;
 115         struct semaphore update_lock;
 116         char valid;             /* 0 until following fields are valid */
 117         unsigned long last_updated;     /* In jiffies */
 118
 119         /* register values */
 120         u8 revision;            /* revision of chip */
 121         u8 global_event;        /* global event status */
 122         u8 global_control;      /* global control register */
 123         u8 wdog_control;        /* watchdog control */
 124         u8 wdog_state;          /* watchdog status */
 125         u8 wdog_preset;         /* watchdog preset */
 126         u8 volt[3];             /* 12, 5, battery current */
 127         u8 temp_act[3];         /* temperature */
 128         u8 temp_status[3];      /* status of sensor */
 129         u8 fan_act[3];          /* fans revolutions per second */
 130         u8 fan_status[3];       /* fan status */
 131         u8 pwm[2];              /* fan min value for rps */
 132         u8 fan_ripple[3];       /* divider for rps */
 133 };
 134
 135 /* Temperature */
 136 #define TEMP_FROM_REG(val)      (((val) - 128) * 1000)
 137
 138 static ssize_t show_temp_input(struct fscpos_data *data, char *buf, int nr)
 139 {
 140         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_act[nr - 1]));
 141 }
 142
 143 static ssize_t show_temp_status(struct fscpos_data *data, char *buf, int nr)
 144 {
 145         /* bits 2..7 reserved => mask with 0x03 */
 146         return sprintf(buf, "%u\n", data->temp_status[nr - 1] & 0x03);
 147 }
 148
 149 static ssize_t show_temp_reset(struct fscpos_data *data, char *buf, int nr)
 150 {
 151         return sprintf(buf, "1\n");
 152 }
 153
 154 static ssize_t set_temp_reset(struct i2c_client *client, struct fscpos_data
 155                         *data, const char *buf, size_t count, int nr, int reg)
 156 {
 157         unsigned long v = simple_strtoul(buf, NULL, 10);
 158         if (v != 1) {
 159                 dev_err(&client->dev, "temp_reset value %ld not supported. "
 160                                         "Use 1 to reset the alarm!\n", v);
 161                 return -EINVAL;
 162         }
 163
 164         dev_info(&client->dev, "You used the temp_reset feature which has not "
 165                                 "been proplerly tested. Please report your "
 166                                 "experience to the module author.\n");
 167
 168         /* Supported value: 2 (clears the status) */
 169         fscpos_write_value(client, FSCPOS_REG_TEMP_STATE[nr], 2);
 170         return count;
 171 }
 172
 173 /* Fans */
 174 #define RPM_FROM_REG(val)       ((val) * 60)
 175
 176 static ssize_t show_fan_status(struct fscpos_data *data, char *buf, int nr)
 177 {
 178         /* bits 0..1, 3..7 reserved => mask with 0x04 */
 179         return sprintf(buf, "%u\n", data->fan_status[nr - 1] & 0x04);
 180 }
 181
 182 static ssize_t show_fan_input(struct fscpos_data *data, char *buf, int nr)
 183 {
 184         return sprintf(buf, "%u\n", RPM_FROM_REG(data->fan_act[nr - 1]));
 185 }
 186
 187 static ssize_t show_fan_ripple(struct fscpos_data *data, char *buf, int nr)
 188 {
 189         /* bits 2..7 reserved => mask with 0x03 */
 190         return sprintf(buf, "%u\n", data->fan_ripple[nr - 1] & 0x03);
 191 }
 192
 193 static ssize_t set_fan_ripple(struct i2c_client *client, struct fscpos_data
 194                         *data, const char *buf, size_t count, int nr, int reg)
 195 {
 196         /* supported values: 2, 4, 8 */
 197         unsigned long v = simple_strtoul(buf, NULL, 10);
 198
 199         switch (v) {
 200                 case 2: v = 1; break;
 201                 case 4: v = 2; break;
 202                 case 8: v = 3; break;
 203         default:
 204                 dev_err(&client->dev, "fan_ripple value %ld not supported. "
 205                                         "Must be one of 2, 4 or 8!\n", v);
 206                 return -EINVAL;
 207         }
 208
 209         down(&data->update_lock);
 210         /* bits 2..7 reserved => mask with 0x03 */
 211         data->fan_ripple[nr - 1] &= ~0x03;
 212         data->fan_ripple[nr - 1] |= v;
 213
 214         fscpos_write_value(client, reg, data->fan_ripple[nr - 1]);
 215         up(&data->update_lock);
 216         return count;
 217 }
 218
 219 static ssize_t show_pwm(struct fscpos_data *data, char *buf, int nr)
 220 {
 221         return sprintf(buf, "%u\n", data->pwm[nr - 1]);
 222 }
 223
 224 static ssize_t set_pwm(struct i2c_client *client, struct fscpos_data *data,
 225                                 const char *buf, size_t count, int nr, int reg)
 226 {
 227         unsigned long v = simple_strtoul(buf, NULL, 10);
 228
 229         /* Range: 0..255 */
 230         if (v < 0) v = 0;
 231         if (v > 255) v = 255;
 232
 233         down(&data->update_lock);
 234         data->pwm[nr - 1] = v;
 235         fscpos_write_value(client, reg, data->pwm[nr - 1]);
 236         up(&data->update_lock);
 237         return count;
 238 }
 239
 240 static void reset_fan_alarm(struct i2c_client *client, int nr)
 241 {
 242         fscpos_write_value(client, FSCPOS_REG_FAN_STATE[nr], 4);
 243 }
 244
 245 /* Volts */
 246 #define VOLT_FROM_REG(val, mult)        ((val) * (mult) / 255)
 247
 248 static ssize_t show_volt_12(struct device *dev, struct device_attribute *attr, char *buf)
 249 {
 250         struct fscpos_data *data = fscpos_update_device(dev);
 251         return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[0], 14200));
 252 }
 253
 254 static ssize_t show_volt_5(struct device *dev, struct device_attribute *attr, char *buf)
 255 {
 256         struct fscpos_data *data = fscpos_update_device(dev);
 257         return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[1], 6600));
 258 }
 259
 260 static ssize_t show_volt_batt(struct device *dev, struct device_attribute *attr, char *buf)
 261 {
 262         struct fscpos_data *data = fscpos_update_device(dev);
 263         return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[2], 3300));
 264 }
 265
 266 /* Watchdog */
 267 static ssize_t show_wdog_control(struct fscpos_data *data, char *buf)
 268 {
 269         /* bits 0..3 reserved, bit 6 write only => mask with 0xb0 */
 270         return sprintf(buf, "%u\n", data->wdog_control & 0xb0);
 271 }
 272
 273 static ssize_t set_wdog_control(struct i2c_client *client, struct fscpos_data
 274                                 *data, const char *buf, size_t count, int reg)
 275 {
 276         /* bits 0..3 reserved => mask with 0xf0 */
 277         unsigned long v = simple_strtoul(buf, NULL, 10) & 0xf0;
 278
 279         down(&data->update_lock);
 280         data->wdog_control &= ~0xf0;
 281         data->wdog_control |= v;
 282         fscpos_write_value(client, reg, data->wdog_control);
 283         up(&data->update_lock);
 284         return count;
 285 }
 286
 287 static ssize_t show_wdog_state(struct fscpos_data *data, char *buf)
 288 {
 289         /* bits 0, 2..7 reserved => mask with 0x02 */
 290         return sprintf(buf, "%u\n", data->wdog_state & 0x02);
 291 }
 292
 293 static ssize_t set_wdog_state(struct i2c_client *client, struct fscpos_data
 294                                 *data, const char *buf, size_t count, int reg)
 295 {
 296         unsigned long v = simple_strtoul(buf, NULL, 10) & 0x02;
 297
 298         /* Valid values: 2 (clear) */
 299         if (v != 2) {
 300                 dev_err(&client->dev, "wdog_state value %ld not supported. "
 301                                         "Must be 2 to clear the state!\n", v);
 302                 return -EINVAL;
 303         }
 304
 305         down(&data->update_lock);
 306         data->wdog_state &= ~v;
 307         fscpos_write_value(client, reg, v);
 308         up(&data->update_lock);
 309         return count;
 310 }
 311
 312 static ssize_t show_wdog_preset(struct fscpos_data *data, char *buf)
 313 {
 314         return sprintf(buf, "%u\n", data->wdog_preset);
 315 }
 316
 317 static ssize_t set_wdog_preset(struct i2c_client *client, struct fscpos_data
 318                                 *data, const char *buf, size_t count, int reg)
 319 {
 320         unsigned long v = simple_strtoul(buf, NULL, 10) & 0xff;
 321
 322         down(&data->update_lock);
 323         data->wdog_preset = v;
 324         fscpos_write_value(client, reg, data->wdog_preset);
 325         up(&data->update_lock);
 326         return count;
 327 }
 328
 329 /* Event */
 330 static ssize_t show_event(struct device *dev, struct device_attribute *attr, char *buf)
 331 {
 332         /* bits 5..7 reserved => mask with 0x1f */
 333         struct fscpos_data *data = fscpos_update_device(dev);
 334         return sprintf(buf, "%u\n", data->global_event & 0x9b);
 335 }
 336
 337 /*
 338  * Sysfs stuff
 339  */
 340 #define create_getter(kind, sub) \
 341         static ssize_t sysfs_show_##kind##sub(struct device *dev, struct device_attribute *attr, char *buf) \
 342         { \
 343                 struct fscpos_data *data = fscpos_update_device(dev); \
 344                 return show_##kind##sub(data, buf); \
 345         }
 346
 347 #define create_getter_n(kind, offset, sub) \
 348         static ssize_t sysfs_show_##kind##offset##sub(struct device *dev, struct device_attribute *attr, char\
 349                                                                         *buf) \
 350         { \
 351                 struct fscpos_data *data = fscpos_update_device(dev); \
 352                 return show_##kind##sub(data, buf, offset); \
 353         }
 354
 355 #define create_setter(kind, sub, reg) \
 356         static ssize_t sysfs_set_##kind##sub (struct device *dev, struct device_attribute *attr, const char \
 357                                                         *buf, size_t count) \
 358         { \
 359                 struct i2c_client *client = to_i2c_client(dev); \
 360                 struct fscpos_data *data = i2c_get_clientdata(client); \
 361                 return set_##kind##sub(client, data, buf, count, reg); \
 362         }
 363
 364 #define create_setter_n(kind, offset, sub, reg) \
 365         static ssize_t sysfs_set_##kind##offset##sub (struct device *dev, struct device_attribute *attr, \
 366                                         const char *buf, size_t count) \
 367         { \
 368                 struct i2c_client *client = to_i2c_client(dev); \
 369                 struct fscpos_data *data = i2c_get_clientdata(client); \
 370                 return set_##kind##sub(client, data, buf, count, offset, reg);\
 371         }
 372
 373 #define create_sysfs_device_ro(kind, sub, offset) \
 374         static DEVICE_ATTR(kind##offset##sub, S_IRUGO, \
 375                                         sysfs_show_##kind##offset##sub, NULL);
 376
 377 #define create_sysfs_device_rw(kind, sub, offset) \
 378         static DEVICE_ATTR(kind##offset##sub, S_IRUGO | S_IWUSR, \
 379                 sysfs_show_##kind##offset##sub, sysfs_set_##kind##offset##sub);
 380
 381 #define sysfs_ro_n(kind, sub, offset) \
 382         create_getter_n(kind, offset, sub); \
 383         create_sysfs_device_ro(kind, sub, offset);
 384
 385 #define sysfs_rw_n(kind, sub, offset, reg) \
 386         create_getter_n(kind, offset, sub); \
 387         create_setter_n(kind, offset, sub, reg); \
 388         create_sysfs_device_rw(kind, sub, offset);
 389
 390 #define sysfs_rw(kind, sub, reg) \
 391         create_getter(kind, sub); \
 392         create_setter(kind, sub, reg); \
 393         create_sysfs_device_rw(kind, sub,);
 394
 395 #define sysfs_fan_with_min(offset, reg_status, reg_ripple, reg_min) \
 396         sysfs_fan(offset, reg_status, reg_ripple); \
 397         sysfs_rw_n(pwm,, offset, reg_min);
 398
 399 #define sysfs_fan(offset, reg_status, reg_ripple) \
 400         sysfs_ro_n(fan, _input, offset); \
 401         sysfs_ro_n(fan, _status, offset); \
 402         sysfs_rw_n(fan, _ripple, offset, reg_ripple);
 403
 404 #define sysfs_temp(offset, reg_status) \
 405         sysfs_ro_n(temp, _input, offset); \
 406         sysfs_ro_n(temp, _status, offset); \
 407         sysfs_rw_n(temp, _reset, offset, reg_status);
 408
 409 #define sysfs_watchdog(reg_wdog_preset, reg_wdog_state, reg_wdog_control) \
 410         sysfs_rw(wdog, _control, reg_wdog_control); \
 411         sysfs_rw(wdog, _preset, reg_wdog_preset); \
 412         sysfs_rw(wdog, _state, reg_wdog_state);
 413
 414 sysfs_fan_with_min(1, FSCPOS_REG_FAN_STATE[0], FSCPOS_REG_FAN_RIPPLE[0],
 415                                                         FSCPOS_REG_PWM[0]);
 416 sysfs_fan_with_min(2, FSCPOS_REG_FAN_STATE[1], FSCPOS_REG_FAN_RIPPLE[1],
 417                                                         FSCPOS_REG_PWM[1]);
 418 sysfs_fan(3, FSCPOS_REG_FAN_STATE[2], FSCPOS_REG_FAN_RIPPLE[2]);
 419
 420 sysfs_temp(1, FSCPOS_REG_TEMP_STATE[0]);
 421 sysfs_temp(2, FSCPOS_REG_TEMP_STATE[1]);
 422 sysfs_temp(3, FSCPOS_REG_TEMP_STATE[2]);
 423
 424 sysfs_watchdog(FSCPOS_REG_WDOG_PRESET, FSCPOS_REG_WDOG_STATE,
 425                                                 FSCPOS_REG_WDOG_CONTROL);
 426
 427 static DEVICE_ATTR(event, S_IRUGO, show_event, NULL);
 428 static DEVICE_ATTR(in0_input, S_IRUGO, show_volt_12, NULL);
 429 static DEVICE_ATTR(in1_input, S_IRUGO, show_volt_5, NULL);
 430 static DEVICE_ATTR(in2_input, S_IRUGO, show_volt_batt, NULL);
 431
 432 static int fscpos_attach_adapter(struct i2c_adapter *adapter)
 433 {
 434         if (!(adapter->class & I2C_CLASS_HWMON))
 435                 return 0;
 436         return i2c_detect(adapter, &addr_data, fscpos_detect);
 437 }
 438
 439 int fscpos_detect(struct i2c_adapter *adapter, int address, int kind)
 440 {
 441         struct i2c_client *new_client;
 442         struct fscpos_data *data;
 443         int err = 0;
 444
 445         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 446                 goto exit;
 447
 448         /*
 449          * OK. For now, we presume we have a valid client. We now create the
 450          * client structure, even though we cannot fill it completely yet.
 451          * But it allows us to access fscpos_{read,write}_value.
 452          */
 453
 454         if (!(data = kmalloc(sizeof(struct fscpos_data), GFP_KERNEL))) {
 455                 err = -ENOMEM;
 456                 goto exit;
 457         }
 458         memset(data, 0, sizeof(struct fscpos_data));
 459
 460         new_client = &data->client;
 461         i2c_set_clientdata(new_client, data);
 462         new_client->addr = address;
 463         new_client->adapter = adapter;
 464         new_client->driver = &fscpos_driver;
 465         new_client->flags = 0;
 466
 467         /* Do the remaining detection unless force or force_fscpos parameter */
 468         if (kind < 0) {
 469                 if ((fscpos_read_value(new_client, FSCPOS_REG_IDENT_0)
 470                         != 0x50) /* 'P' */
 471                 || (fscpos_read_value(new_client, FSCPOS_REG_IDENT_1)
 472                         != 0x45) /* 'E' */
 473                 || (fscpos_read_value(new_client, FSCPOS_REG_IDENT_2)
 474                         != 0x47))/* 'G' */
 475                 {
 476                         dev_dbg(&new_client->dev, "fscpos detection failed\n");
 477                         goto exit_free;
 478                 }
 479         }
 480
 481         /* Fill in the remaining client fields and put it in the global list */
 482         strlcpy(new_client->name, "fscpos", I2C_NAME_SIZE);
 483
 484         data->valid = 0;
 485         init_MUTEX(&data->update_lock);
 486
 487         /* Tell the I2C layer a new client has arrived */
 488         if ((err = i2c_attach_client(new_client)))
 489                 goto exit_free;
 490
 491         /* Inizialize the fscpos chip */
 492         fscpos_init_client(new_client);
 493
 494         /* Announce that the chip was found */
 495         dev_info(&new_client->dev, "Found fscpos chip, rev %u\n", data->revision);
 496
 497         /* Register sysfs hooks */
 498         device_create_file(&new_client->dev, &dev_attr_event);
 499         device_create_file(&new_client->dev, &dev_attr_in0_input);
 500         device_create_file(&new_client->dev, &dev_attr_in1_input);
 501         device_create_file(&new_client->dev, &dev_attr_in2_input);
 502         device_create_file(&new_client->dev, &dev_attr_wdog_control);
 503         device_create_file(&new_client->dev, &dev_attr_wdog_preset);
 504         device_create_file(&new_client->dev, &dev_attr_wdog_state);
 505         device_create_file(&new_client->dev, &dev_attr_temp1_input);
 506         device_create_file(&new_client->dev, &dev_attr_temp1_status);
 507         device_create_file(&new_client->dev, &dev_attr_temp1_reset);
 508         device_create_file(&new_client->dev, &dev_attr_temp2_input);
 509         device_create_file(&new_client->dev, &dev_attr_temp2_status);
 510         device_create_file(&new_client->dev, &dev_attr_temp2_reset);
 511         device_create_file(&new_client->dev, &dev_attr_temp3_input);
 512         device_create_file(&new_client->dev, &dev_attr_temp3_status);
 513         device_create_file(&new_client->dev, &dev_attr_temp3_reset);
 514         device_create_file(&new_client->dev, &dev_attr_fan1_input);
 515         device_create_file(&new_client->dev, &dev_attr_fan1_status);
 516         device_create_file(&new_client->dev, &dev_attr_fan1_ripple);
 517         device_create_file(&new_client->dev, &dev_attr_pwm1);
 518         device_create_file(&new_client->dev, &dev_attr_fan2_input);
 519         device_create_file(&new_client->dev, &dev_attr_fan2_status);
 520         device_create_file(&new_client->dev, &dev_attr_fan2_ripple);
 521         device_create_file(&new_client->dev, &dev_attr_pwm2);
 522         device_create_file(&new_client->dev, &dev_attr_fan3_input);
 523         device_create_file(&new_client->dev, &dev_attr_fan3_status);
 524         device_create_file(&new_client->dev, &dev_attr_fan3_ripple);
 525
 526         return 0;
 527
 528 exit_free:
 529         kfree(data);
 530 exit:
 531         return err;
 532 }
 533
 534 static int fscpos_detach_client(struct i2c_client *client)
 535 {
 536         int err;
 537
 538         if ((err = i2c_detach_client(client))) {
 539                 dev_err(&client->dev, "Client deregistration failed, client"
 540                                                         " not detached.\n");
 541                 return err;
 542         }
 543         kfree(i2c_get_clientdata(client));
 544         return 0;
 545 }
 546
 547 static int fscpos_read_value(struct i2c_client *client, u8 reg)
 548 {
 549         dev_dbg(&client->dev, "Read reg 0x%02x\n", reg);
 550         return i2c_smbus_read_byte_data(client, reg);
 551 }
 552
 553 static int fscpos_write_value(struct i2c_client *client, u8 reg, u8 value)
 554 {
 555         dev_dbg(&client->dev, "Write reg 0x%02x, val 0x%02x\n", reg, value);
 556         return i2c_smbus_write_byte_data(client, reg, value);
 557 }
 558
 559 /* Called when we have found a new FSCPOS chip */
 560 static void fscpos_init_client(struct i2c_client *client)
 561 {
 562         struct fscpos_data *data = i2c_get_clientdata(client);
 563
 564         /* read revision from chip */
 565         data->revision = fscpos_read_value(client, FSCPOS_REG_REVISION);
 566 }
 567
 568 static struct fscpos_data *fscpos_update_device(struct device *dev)
 569 {
 570         struct i2c_client *client = to_i2c_client(dev);
 571         struct fscpos_data *data = i2c_get_clientdata(client);
 572
 573         down(&data->update_lock);
 574
 575         if ((jiffies - data->last_updated > 2 * HZ) ||
 576                         (jiffies < data->last_updated) || !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);