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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/init.h>
  38 #include <linux/hwmon.h>
  39 #include <linux/err.h>
  40
  41 /*
  42  * Addresses to scan
  43  */
  44 static unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END };
  45
  46 /*
  47  * Insmod parameters
  48  */
  49 I2C_CLIENT_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         .driver = {
 104                 .name   = "fscpos",
 105         },
 106         .id             = I2C_DRIVERID_FSCPOS,
 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 class_device *class_dev;
 117         struct semaphore update_lock;
 118         char valid;             /* 0 until following fields are valid */
 119         unsigned long last_updated;     /* In jiffies */
 120
 121         /* register values */
 122         u8 revision;            /* revision of chip */
 123         u8 global_event;        /* global event status */
 124         u8 global_control;      /* global control register */
 125         u8 wdog_control;        /* watchdog control */
 126         u8 wdog_state;          /* watchdog status */
 127         u8 wdog_preset;         /* watchdog preset */
 128         u8 volt[3];             /* 12, 5, battery current */
 129         u8 temp_act[3];         /* temperature */
 130         u8 temp_status[3];      /* status of sensor */
 131         u8 fan_act[3];          /* fans revolutions per second */
 132         u8 fan_status[3];       /* fan status */
 133         u8 pwm[2];              /* fan min value for rps */
 134         u8 fan_ripple[3];       /* divider for rps */
 135 };
 136
 137 /* Temperature */
 138 #define TEMP_FROM_REG(val)      (((val) - 128) * 1000)
 139
 140 static ssize_t show_temp_input(struct fscpos_data *data, char *buf, int nr)
 141 {
 142         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_act[nr - 1]));
 143 }
 144
 145 static ssize_t show_temp_status(struct fscpos_data *data, char *buf, int nr)
 146 {
 147         /* bits 2..7 reserved => mask with 0x03 */
 148         return sprintf(buf, "%u\n", data->temp_status[nr - 1] & 0x03);
 149 }
 150
 151 static ssize_t show_temp_reset(struct fscpos_data *data, char *buf, int nr)
 152 {
 153         return sprintf(buf, "1\n");
 154 }
 155
 156 static ssize_t set_temp_reset(struct i2c_client *client, struct fscpos_data
 157                         *data, const char *buf, size_t count, int nr, int reg)
 158 {
 159         unsigned long v = simple_strtoul(buf, NULL, 10);
 160         if (v != 1) {
 161                 dev_err(&client->dev, "temp_reset value %ld not supported. "
 162                                         "Use 1 to reset the alarm!\n", v);
 163                 return -EINVAL;
 164         }
 165
 166         dev_info(&client->dev, "You used the temp_reset feature which has not "
 167                                 "been proplerly tested. Please report your "
 168                                 "experience to the module author.\n");
 169
 170         /* Supported value: 2 (clears the status) */
 171         fscpos_write_value(client, FSCPOS_REG_TEMP_STATE[nr - 1], 2);
 172         return count;
 173 }
 174
 175 /* Fans */
 176 #define RPM_FROM_REG(val)       ((val) * 60)
 177
 178 static ssize_t show_fan_status(struct fscpos_data *data, char *buf, int nr)
 179 {
 180         /* bits 0..1, 3..7 reserved => mask with 0x04 */
 181         return sprintf(buf, "%u\n", data->fan_status[nr - 1] & 0x04);
 182 }
 183
 184 static ssize_t show_fan_input(struct fscpos_data *data, char *buf, int nr)
 185 {
 186         return sprintf(buf, "%u\n", RPM_FROM_REG(data->fan_act[nr - 1]));
 187 }
 188
 189 static ssize_t show_fan_ripple(struct fscpos_data *data, char *buf, int nr)
 190 {
 191         /* bits 2..7 reserved => mask with 0x03 */
 192         return sprintf(buf, "%u\n", data->fan_ripple[nr - 1] & 0x03);
 193 }
 194
 195 static ssize_t set_fan_ripple(struct i2c_client *client, struct fscpos_data
 196                         *data, const char *buf, size_t count, int nr, int reg)
 197 {
 198         /* supported values: 2, 4, 8 */
 199         unsigned long v = simple_strtoul(buf, NULL, 10);
 200
 201         switch (v) {
 202                 case 2: v = 1; break;
 203                 case 4: v = 2; break;
 204                 case 8: v = 3; break;
 205         default:
 206                 dev_err(&client->dev, "fan_ripple value %ld not supported. "
 207                                         "Must be one of 2, 4 or 8!\n", v);
 208                 return -EINVAL;
 209         }
 210
 211         down(&data->update_lock);
 212         /* bits 2..7 reserved => mask with 0x03 */
 213         data->fan_ripple[nr - 1] &= ~0x03;
 214         data->fan_ripple[nr - 1] |= v;
 215
 216         fscpos_write_value(client, reg, data->fan_ripple[nr - 1]);
 217         up(&data->update_lock);
 218         return count;
 219 }
 220
 221 static ssize_t show_pwm(struct fscpos_data *data, char *buf, int nr)
 222 {
 223         return sprintf(buf, "%u\n", data->pwm[nr - 1]);
 224 }
 225
 226 static ssize_t set_pwm(struct i2c_client *client, struct fscpos_data *data,
 227                                 const char *buf, size_t count, int nr, int reg)
 228 {
 229         unsigned long v = simple_strtoul(buf, NULL, 10);
 230
 231         /* Range: 0..255 */
 232         if (v < 0) v = 0;
 233         if (v > 255) v = 255;
 234
 235         down(&data->update_lock);
 236         data->pwm[nr - 1] = v;
 237         fscpos_write_value(client, reg, data->pwm[nr - 1]);
 238         up(&data->update_lock);
 239         return count;
 240 }
 241
 242 static void reset_fan_alarm(struct i2c_client *client, int nr)
 243 {
 244         fscpos_write_value(client, FSCPOS_REG_FAN_STATE[nr], 4);
 245 }
 246
 247 /* Volts */
 248 #define VOLT_FROM_REG(val, mult)        ((val) * (mult) / 255)
 249
 250 static ssize_t show_volt_12(struct device *dev, struct device_attribute *attr, char *buf)
 251 {
 252         struct fscpos_data *data = fscpos_update_device(dev);
 253         return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[0], 14200));
 254 }
 255
 256 static ssize_t show_volt_5(struct device *dev, struct device_attribute *attr, char *buf)
 257 {
 258         struct fscpos_data *data = fscpos_update_device(dev);
 259         return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[1], 6600));
 260 }
 261
 262 static ssize_t show_volt_batt(struct device *dev, struct device_attribute *attr, char *buf)
 263 {
 264         struct fscpos_data *data = fscpos_update_device(dev);
 265         return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[2], 3300));
 266 }
 267
 268 /* Watchdog */
 269 static ssize_t show_wdog_control(struct fscpos_data *data, char *buf)
 270 {
 271         /* bits 0..3 reserved, bit 6 write only => mask with 0xb0 */
 272         return sprintf(buf, "%u\n", data->wdog_control & 0xb0);
 273 }
 274
 275 static ssize_t set_wdog_control(struct i2c_client *client, struct fscpos_data
 276                                 *data, const char *buf, size_t count, int reg)
 277 {
 278         /* bits 0..3 reserved => mask with 0xf0 */
 279         unsigned long v = simple_strtoul(buf, NULL, 10) & 0xf0;
 280
 281         down(&data->update_lock);
 282         data->wdog_control &= ~0xf0;
 283         data->wdog_control |= v;
 284         fscpos_write_value(client, reg, data->wdog_control);
 285         up(&data->update_lock);
 286         return count;
 287 }
 288
 289 static ssize_t show_wdog_state(struct fscpos_data *data, char *buf)
 290 {
 291         /* bits 0, 2..7 reserved => mask with 0x02 */
 292         return sprintf(buf, "%u\n", data->wdog_state & 0x02);
 293 }
 294
 295 static ssize_t set_wdog_state(struct i2c_client *client, struct fscpos_data
 296                                 *data, const char *buf, size_t count, int reg)
 297 {
 298         unsigned long v = simple_strtoul(buf, NULL, 10) & 0x02;
 299
 300         /* Valid values: 2 (clear) */
 301         if (v != 2) {
 302                 dev_err(&client->dev, "wdog_state value %ld not supported. "
 303                                         "Must be 2 to clear the state!\n", v);
 304                 return -EINVAL;
 305         }
 306
 307         down(&data->update_lock);
 308         data->wdog_state &= ~v;
 309         fscpos_write_value(client, reg, v);
 310         up(&data->update_lock);
 311         return count;
 312 }
 313
 314 static ssize_t show_wdog_preset(struct fscpos_data *data, char *buf)
 315 {
 316         return sprintf(buf, "%u\n", data->wdog_preset);
 317 }
 318
 319 static ssize_t set_wdog_preset(struct i2c_client *client, struct fscpos_data
 320                                 *data, const char *buf, size_t count, int reg)
 321 {
 322         unsigned long v = simple_strtoul(buf, NULL, 10) & 0xff;
 323
 324         down(&data->update_lock);
 325         data->wdog_preset = v;
 326         fscpos_write_value(client, reg, data->wdog_preset);
 327         up(&data->update_lock);
 328         return count;
 329 }
 330
 331 /* Event */
 332 static ssize_t show_event(struct device *dev, struct device_attribute *attr, char *buf)
 333 {
 334         /* bits 5..7 reserved => mask with 0x1f */
 335         struct fscpos_data *data = fscpos_update_device(dev);
 336         return sprintf(buf, "%u\n", data->global_event & 0x9b);
 337 }
 338
 339 /*
 340  * Sysfs stuff
 341  */
 342 #define create_getter(kind, sub) \
 343         static ssize_t sysfs_show_##kind##sub(struct device *dev, struct device_attribute *attr, char *buf) \
 344         { \
 345                 struct fscpos_data *data = fscpos_update_device(dev); \
 346                 return show_##kind##sub(data, buf); \
 347         }
 348
 349 #define create_getter_n(kind, offset, sub) \
 350         static ssize_t sysfs_show_##kind##offset##sub(struct device *dev, struct device_attribute *attr, char\
 351                                                                         *buf) \
 352         { \
 353                 struct fscpos_data *data = fscpos_update_device(dev); \
 354                 return show_##kind##sub(data, buf, offset); \
 355         }
 356
 357 #define create_setter(kind, sub, reg) \
 358         static ssize_t sysfs_set_##kind##sub (struct device *dev, struct device_attribute *attr, const char \
 359                                                         *buf, size_t count) \
 360         { \
 361                 struct i2c_client *client = to_i2c_client(dev); \
 362                 struct fscpos_data *data = i2c_get_clientdata(client); \
 363                 return set_##kind##sub(client, data, buf, count, reg); \
 364         }
 365
 366 #define create_setter_n(kind, offset, sub, reg) \
 367         static ssize_t sysfs_set_##kind##offset##sub (struct device *dev, struct device_attribute *attr, \
 368                                         const char *buf, size_t count) \
 369         { \
 370                 struct i2c_client *client = to_i2c_client(dev); \
 371                 struct fscpos_data *data = i2c_get_clientdata(client); \
 372                 return set_##kind##sub(client, data, buf, count, offset, reg);\
 373         }
 374
 375 #define create_sysfs_device_ro(kind, sub, offset) \
 376         static DEVICE_ATTR(kind##offset##sub, S_IRUGO, \
 377                                         sysfs_show_##kind##offset##sub, NULL);
 378
 379 #define create_sysfs_device_rw(kind, sub, offset) \
 380         static DEVICE_ATTR(kind##offset##sub, S_IRUGO | S_IWUSR, \
 381                 sysfs_show_##kind##offset##sub, sysfs_set_##kind##offset##sub);
 382
 383 #define sysfs_ro_n(kind, sub, offset) \
 384         create_getter_n(kind, offset, sub); \
 385         create_sysfs_device_ro(kind, sub, offset);
 386
 387 #define sysfs_rw_n(kind, sub, offset, reg) \
 388         create_getter_n(kind, offset, sub); \
 389         create_setter_n(kind, offset, sub, reg); \
 390         create_sysfs_device_rw(kind, sub, offset);
 391
 392 #define sysfs_rw(kind, sub, reg) \
 393         create_getter(kind, sub); \
 394         create_setter(kind, sub, reg); \
 395         create_sysfs_device_rw(kind, sub,);
 396
 397 #define sysfs_fan_with_min(offset, reg_status, reg_ripple, reg_min) \
 398         sysfs_fan(offset, reg_status, reg_ripple); \
 399         sysfs_rw_n(pwm,, offset, reg_min);
 400
 401 #define sysfs_fan(offset, reg_status, reg_ripple) \
 402         sysfs_ro_n(fan, _input, offset); \
 403         sysfs_ro_n(fan, _status, offset); \
 404         sysfs_rw_n(fan, _ripple, offset, reg_ripple);
 405
 406 #define sysfs_temp(offset, reg_status) \
 407         sysfs_ro_n(temp, _input, offset); \
 408         sysfs_ro_n(temp, _status, offset); \
 409         sysfs_rw_n(temp, _reset, offset, reg_status);
 410
 411 #define sysfs_watchdog(reg_wdog_preset, reg_wdog_state, reg_wdog_control) \
 412         sysfs_rw(wdog, _control, reg_wdog_control); \
 413         sysfs_rw(wdog, _preset, reg_wdog_preset); \
 414         sysfs_rw(wdog, _state, reg_wdog_state);
 415
 416 sysfs_fan_with_min(1, FSCPOS_REG_FAN_STATE[0], FSCPOS_REG_FAN_RIPPLE[0],
 417                                                         FSCPOS_REG_PWM[0]);
 418 sysfs_fan_with_min(2, FSCPOS_REG_FAN_STATE[1], FSCPOS_REG_FAN_RIPPLE[1],
 419                                                         FSCPOS_REG_PWM[1]);
 420 sysfs_fan(3, FSCPOS_REG_FAN_STATE[2], FSCPOS_REG_FAN_RIPPLE[2]);
 421
 422 sysfs_temp(1, FSCPOS_REG_TEMP_STATE[0]);
 423 sysfs_temp(2, FSCPOS_REG_TEMP_STATE[1]);
 424 sysfs_temp(3, FSCPOS_REG_TEMP_STATE[2]);
 425
 426 sysfs_watchdog(FSCPOS_REG_WDOG_PRESET, FSCPOS_REG_WDOG_STATE,
 427                                                 FSCPOS_REG_WDOG_CONTROL);
 428
 429 static DEVICE_ATTR(event, S_IRUGO, show_event, NULL);
 430 static DEVICE_ATTR(in0_input, S_IRUGO, show_volt_12, NULL);
 431 static DEVICE_ATTR(in1_input, S_IRUGO, show_volt_5, NULL);
 432 static DEVICE_ATTR(in2_input, S_IRUGO, show_volt_batt, NULL);
 433
 434 static int fscpos_attach_adapter(struct i2c_adapter *adapter)
 435 {
 436         if (!(adapter->class & I2C_CLASS_HWMON))
 437                 return 0;
 438         return i2c_probe(adapter, &addr_data, fscpos_detect);
 439 }
 440
 441 static int fscpos_detect(struct i2c_adapter *adapter, int address, int kind)
 442 {
 443         struct i2c_client *new_client;
 444         struct fscpos_data *data;
 445         int err = 0;
 446
 447         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 448                 goto exit;
 449
 450         /*
 451          * OK. For now, we presume we have a valid client. We now create the
 452          * client structure, even though we cannot fill it completely yet.
 453          * But it allows us to access fscpos_{read,write}_value.
 454          */
 455
 456         if (!(data = kzalloc(sizeof(struct fscpos_data), GFP_KERNEL))) {
 457                 err = -ENOMEM;
 458                 goto exit;
 459         }
 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         data->class_dev = hwmon_device_register(&new_client->dev);
 500         if (IS_ERR(data->class_dev)) {
 501                 err = PTR_ERR(data->class_dev);
 502                 goto exit_detach;
 503         }
 504
 505         device_create_file(&new_client->dev, &dev_attr_event);
 506         device_create_file(&new_client->dev, &dev_attr_in0_input);
 507         device_create_file(&new_client->dev, &dev_attr_in1_input);
 508         device_create_file(&new_client->dev, &dev_attr_in2_input);
 509         device_create_file(&new_client->dev, &dev_attr_wdog_control);
 510         device_create_file(&new_client->dev, &dev_attr_wdog_preset);
 511         device_create_file(&new_client->dev, &dev_attr_wdog_state);
 512         device_create_file(&new_client->dev, &dev_attr_temp1_input);
 513         device_create_file(&new_client->dev, &dev_attr_temp1_status);
 514         device_create_file(&new_client->dev, &dev_attr_temp1_reset);
 515         device_create_file(&new_client->dev, &dev_attr_temp2_input);
 516         device_create_file(&new_client->dev, &dev_attr_temp2_status);
 517         device_create_file(&new_client->dev, &dev_attr_temp2_reset);
 518         device_create_file(&new_client->dev, &dev_attr_temp3_input);
 519         device_create_file(&new_client->dev, &dev_attr_temp3_status);
 520         device_create_file(&new_client->dev, &dev_attr_temp3_reset);
 521         device_create_file(&new_client->dev, &dev_attr_fan1_input);
 522         device_create_file(&new_client->dev, &dev_attr_fan1_status);
 523         device_create_file(&new_client->dev, &dev_attr_fan1_ripple);
 524         device_create_file(&new_client->dev, &dev_attr_pwm1);
 525         device_create_file(&new_client->dev, &dev_attr_fan2_input);
 526         device_create_file(&new_client->dev, &dev_attr_fan2_status);
 527         device_create_file(&new_client->dev, &dev_attr_fan2_ripple);
 528         device_create_file(&new_client->dev, &dev_attr_pwm2);
 529         device_create_file(&new_client->dev, &dev_attr_fan3_input);
 530         device_create_file(&new_client->dev, &dev_attr_fan3_status);
 531         device_create_file(&new_client->dev, &dev_attr_fan3_ripple);
 532
 533         return 0;
 534
 535 exit_detach:
 536         i2c_detach_client(new_client);
 537 exit_free:
 538         kfree(data);
 539 exit:
 540         return err;
 541 }
 542
 543 static int fscpos_detach_client(struct i2c_client *client)
 544 {
 545         struct fscpos_data *data = i2c_get_clientdata(client);
 546         int err;
 547
 548         hwmon_device_unregister(data->class_dev);
 549
 550         if ((err = i2c_detach_client(client)))
 551                 return err;
 552         kfree(data);
 553         return 0;
 554 }
 555
 556 static int fscpos_read_value(struct i2c_client *client, u8 reg)
 557 {
 558         dev_dbg(&client->dev, "Read reg 0x%02x\n", reg);
 559         return i2c_smbus_read_byte_data(client, reg);
 560 }
 561
 562 static int fscpos_write_value(struct i2c_client *client, u8 reg, u8 value)
 563 {
 564         dev_dbg(&client->dev, "Write reg 0x%02x, val 0x%02x\n", reg, value);
 565         return i2c_smbus_write_byte_data(client, reg, value);
 566 }
 567
 568 /* Called when we have found a new FSCPOS chip */
 569 static void fscpos_init_client(struct i2c_client *client)
 570 {
 571         struct fscpos_data *data = i2c_get_clientdata(client);
 572
 573         /* read revision from chip */
 574         data->revision = fscpos_read_value(client, FSCPOS_REG_REVISION);
 575 }
 576
 577 static struct fscpos_data *fscpos_update_device(struct device *dev)
 578 {
 579         struct i2c_client *client = to_i2c_client(dev);
 580         struct fscpos_data *data = i2c_get_clientdata(client);
 581
 582         down(&data->update_lock);
 583
 584         if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
 585                 int i;
 586
 587                 dev_dbg(&client->dev, "Starting fscpos update\n");
 588
 589                 for (i = 0; i < 3; i++) {
 590                         data->temp_act[i] = fscpos_read_value(client,
 591                                                 FSCPOS_REG_TEMP_ACT[i]);
 592                         data->temp_status[i] = fscpos_read_value(client,
 593                                                 FSCPOS_REG_TEMP_STATE[i]);
 594                         data->fan_act[i] = fscpos_read_value(client,
 595                                                 FSCPOS_REG_FAN_ACT[i]);
 596                         data->fan_status[i] = fscpos_read_value(client,
 597                                                 FSCPOS_REG_FAN_STATE[i]);
 598                         data->fan_ripple[i] = fscpos_read_value(client,
 599                                                 FSCPOS_REG_FAN_RIPPLE[i]);
 600                         if (i < 2) {
 601                                 /* fan2_min is not supported by the chip */
 602                                 data->pwm[i] = fscpos_read_value(client,
 603                                                         FSCPOS_REG_PWM[i]);
 604                         }
 605                         /* reset fan status if speed is back to > 0 */
 606                         if (data->fan_status[i] != 0 && data->fan_act[i] > 0) {
 607                                 reset_fan_alarm(client, i);
 608                         }
 609                 }
 610
 611                 data->volt[0] = fscpos_read_value(client, FSCPOS_REG_VOLT_12);
 612                 data->volt[1] = fscpos_read_value(client, FSCPOS_REG_VOLT_5);
 613                 data->volt[2] = fscpos_read_value(client, FSCPOS_REG_VOLT_BATT);
 614
 615                 data->wdog_preset = fscpos_read_value(client,
 616                                                         FSCPOS_REG_WDOG_PRESET);
 617                 data->wdog_state = fscpos_read_value(client,
 618                                                         FSCPOS_REG_WDOG_STATE);
 619                 data->wdog_control = fscpos_read_value(client,
 620                                                 FSCPOS_REG_WDOG_CONTROL);
 621
 622                 data->global_event = fscpos_read_value(client,
 623                                                 FSCPOS_REG_EVENT_STATE);
 624
 625                 data->last_updated = jiffies;
 626                 data->valid = 1;
 627         }
 628         up(&data->update_lock);
 629         return data;
 630 }
 631
 632 static int __init sm_fscpos_init(void)
 633 {
 634         return i2c_add_driver(&fscpos_driver);
 635 }
 636
 637 static void __exit sm_fscpos_exit(void)
 638 {
 639         i2c_del_driver(&fscpos_driver);
 640 }
 641
 642 MODULE_AUTHOR("Stefan Ott <stefan@desire.ch> based on work from Hermann Jung "
 643                                 "<hej@odn.de>, Frodo Looijaard <frodol@dds.nl>"
 644                                 " and Philip Edelbrock <phil@netroedge.com>");
 645 MODULE_DESCRIPTION("fujitsu siemens poseidon chip driver");
 646 MODULE_LICENSE("GPL");
 647
 648 module_init(sm_fscpos_init);
 649 module_exit(sm_fscpos_exit);