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 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         .id             = I2C_DRIVERID_FSCPOS,
 109         .attach_adapter = fscpos_attach_adapter,
 110         .detach_client  = fscpos_detach_client,
 111 };
 112
 113 /*
 114  * Client data (each client gets its own)
 115  */
 116 struct fscpos_data {
 117         struct i2c_client client;
 118         struct class_device *class_dev;
 119         struct mutex update_lock;
 120         char valid;             /* 0 until following fields are valid */
 121         unsigned long last_updated;     /* In jiffies */
 122
 123         /* register values */
 124         u8 revision;            /* revision of chip */
 125         u8 global_event;        /* global event status */
 126         u8 global_control;      /* global control register */
 127         u8 wdog_control;        /* watchdog control */
 128         u8 wdog_state;          /* watchdog status */
 129         u8 wdog_preset;         /* watchdog preset */
 130         u8 volt[3];             /* 12, 5, battery current */
 131         u8 temp_act[3];         /* temperature */
 132         u8 temp_status[3];      /* status of sensor */
 133         u8 fan_act[3];          /* fans revolutions per second */
 134         u8 fan_status[3];       /* fan status */
 135         u8 pwm[2];              /* fan min value for rps */
 136         u8 fan_ripple[3];       /* divider for rps */
 137 };
 138
 139 /* Temperature */
 140 #define TEMP_FROM_REG(val)      (((val) - 128) * 1000)
 141
 142 static ssize_t show_temp_input(struct fscpos_data *data, char *buf, int nr)
 143 {
 144         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_act[nr - 1]));
 145 }
 146
 147 static ssize_t show_temp_status(struct fscpos_data *data, char *buf, int nr)
 148 {
 149         /* bits 2..7 reserved => mask with 0x03 */
 150         return sprintf(buf, "%u\n", data->temp_status[nr - 1] & 0x03);
 151 }
 152
 153 static ssize_t show_temp_reset(struct fscpos_data *data, char *buf, int nr)
 154 {
 155         return sprintf(buf, "1\n");
 156 }
 157
 158 static ssize_t set_temp_reset(struct i2c_client *client, struct fscpos_data
 159                         *data, const char *buf, size_t count, int nr, int reg)
 160 {
 161         unsigned long v = simple_strtoul(buf, NULL, 10);
 162         if (v != 1) {
 163                 dev_err(&client->dev, "temp_reset value %ld not supported. "
 164                                         "Use 1 to reset the alarm!\n", v);
 165                 return -EINVAL;
 166         }
 167
 168         dev_info(&client->dev, "You used the temp_reset feature which has not "
 169                                 "been proplerly tested. Please report your "
 170                                 "experience to the module author.\n");
 171
 172         /* Supported value: 2 (clears the status) */
 173         fscpos_write_value(client, FSCPOS_REG_TEMP_STATE[nr - 1], 2);
 174         return count;
 175 }
 176
 177 /* Fans */
 178 #define RPM_FROM_REG(val)       ((val) * 60)
 179
 180 static ssize_t show_fan_status(struct fscpos_data *data, char *buf, int nr)
 181 {
 182         /* bits 0..1, 3..7 reserved => mask with 0x04 */
 183         return sprintf(buf, "%u\n", data->fan_status[nr - 1] & 0x04);
 184 }
 185
 186 static ssize_t show_fan_input(struct fscpos_data *data, char *buf, int nr)
 187 {
 188         return sprintf(buf, "%u\n", RPM_FROM_REG(data->fan_act[nr - 1]));
 189 }
 190
 191 static ssize_t show_fan_ripple(struct fscpos_data *data, char *buf, int nr)
 192 {
 193         /* bits 2..7 reserved => mask with 0x03 */
 194         return sprintf(buf, "%u\n", data->fan_ripple[nr - 1] & 0x03);
 195 }
 196
 197 static ssize_t set_fan_ripple(struct i2c_client *client, struct fscpos_data
 198                         *data, const char *buf, size_t count, int nr, int reg)
 199 {
 200         /* supported values: 2, 4, 8 */
 201         unsigned long v = simple_strtoul(buf, NULL, 10);
 202
 203         switch (v) {
 204                 case 2: v = 1; break;
 205                 case 4: v = 2; break;
 206                 case 8: v = 3; break;
 207         default:
 208                 dev_err(&client->dev, "fan_ripple value %ld not supported. "
 209                                         "Must be one of 2, 4 or 8!\n", v);
 210                 return -EINVAL;
 211         }
 212
 213         mutex_lock(&data->update_lock);
 214         /* bits 2..7 reserved => mask with 0x03 */
 215         data->fan_ripple[nr - 1] &= ~0x03;
 216         data->fan_ripple[nr - 1] |= v;
 217
 218         fscpos_write_value(client, reg, data->fan_ripple[nr - 1]);
 219         mutex_unlock(&data->update_lock);
 220         return count;
 221 }
 222
 223 static ssize_t show_pwm(struct fscpos_data *data, char *buf, int nr)
 224 {
 225         return sprintf(buf, "%u\n", data->pwm[nr - 1]);
 226 }
 227
 228 static ssize_t set_pwm(struct i2c_client *client, struct fscpos_data *data,
 229                                 const char *buf, size_t count, int nr, int reg)
 230 {
 231         unsigned long v = simple_strtoul(buf, NULL, 10);
 232
 233         /* Range: 0..255 */
 234         if (v < 0) v = 0;
 235         if (v > 255) v = 255;
 236
 237         mutex_lock(&data->update_lock);
 238         data->pwm[nr - 1] = v;
 239         fscpos_write_value(client, reg, data->pwm[nr - 1]);
 240         mutex_unlock(&data->update_lock);
 241         return count;
 242 }
 243
 244 static void reset_fan_alarm(struct i2c_client *client, int nr)
 245 {
 246         fscpos_write_value(client, FSCPOS_REG_FAN_STATE[nr], 4);
 247 }
 248
 249 /* Volts */
 250 #define VOLT_FROM_REG(val, mult)        ((val) * (mult) / 255)
 251
 252 static ssize_t show_volt_12(struct device *dev, struct device_attribute *attr, char *buf)
 253 {
 254         struct fscpos_data *data = fscpos_update_device(dev);
 255         return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[0], 14200));
 256 }
 257
 258 static ssize_t show_volt_5(struct device *dev, struct device_attribute *attr, char *buf)
 259 {
 260         struct fscpos_data *data = fscpos_update_device(dev);
 261         return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[1], 6600));
 262 }
 263
 264 static ssize_t show_volt_batt(struct device *dev, struct device_attribute *attr, char *buf)
 265 {
 266         struct fscpos_data *data = fscpos_update_device(dev);
 267         return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[2], 3300));
 268 }
 269
 270 /* Watchdog */
 271 static ssize_t show_wdog_control(struct fscpos_data *data, char *buf)
 272 {
 273         /* bits 0..3 reserved, bit 6 write only => mask with 0xb0 */
 274         return sprintf(buf, "%u\n", data->wdog_control & 0xb0);
 275 }
 276
 277 static ssize_t set_wdog_control(struct i2c_client *client, struct fscpos_data
 278                                 *data, const char *buf, size_t count, int reg)
 279 {
 280         /* bits 0..3 reserved => mask with 0xf0 */
 281         unsigned long v = simple_strtoul(buf, NULL, 10) & 0xf0;
 282
 283         mutex_lock(&data->update_lock);
 284         data->wdog_control &= ~0xf0;
 285         data->wdog_control |= v;
 286         fscpos_write_value(client, reg, data->wdog_control);
 287         mutex_unlock(&data->update_lock);
 288         return count;
 289 }
 290
 291 static ssize_t show_wdog_state(struct fscpos_data *data, char *buf)
 292 {
 293         /* bits 0, 2..7 reserved => mask with 0x02 */
 294         return sprintf(buf, "%u\n", data->wdog_state & 0x02);
 295 }
 296
 297 static ssize_t set_wdog_state(struct i2c_client *client, struct fscpos_data
 298                                 *data, const char *buf, size_t count, int reg)
 299 {
 300         unsigned long v = simple_strtoul(buf, NULL, 10) & 0x02;
 301
 302         /* Valid values: 2 (clear) */
 303         if (v != 2) {
 304                 dev_err(&client->dev, "wdog_state value %ld not supported. "
 305                                         "Must be 2 to clear the state!\n", v);
 306                 return -EINVAL;
 307         }
 308
 309         mutex_lock(&data->update_lock);
 310         data->wdog_state &= ~v;
 311         fscpos_write_value(client, reg, v);
 312         mutex_unlock(&data->update_lock);
 313         return count;
 314 }
 315
 316 static ssize_t show_wdog_preset(struct fscpos_data *data, char *buf)
 317 {
 318         return sprintf(buf, "%u\n", data->wdog_preset);
 319 }
 320
 321 static ssize_t set_wdog_preset(struct i2c_client *client, struct fscpos_data
 322                                 *data, const char *buf, size_t count, int reg)
 323 {
 324         unsigned long v = simple_strtoul(buf, NULL, 10) & 0xff;
 325
 326         mutex_lock(&data->update_lock);
 327         data->wdog_preset = v;
 328         fscpos_write_value(client, reg, data->wdog_preset);
 329         mutex_unlock(&data->update_lock);
 330         return count;
 331 }
 332
 333 /* Event */
 334 static ssize_t show_event(struct device *dev, struct device_attribute *attr, char *buf)
 335 {
 336         /* bits 5..7 reserved => mask with 0x1f */
 337         struct fscpos_data *data = fscpos_update_device(dev);
 338         return sprintf(buf, "%u\n", data->global_event & 0x9b);
 339 }
 340
 341 /*
 342  * Sysfs stuff
 343  */
 344 #define create_getter(kind, sub) \
 345         static ssize_t sysfs_show_##kind##sub(struct device *dev, struct device_attribute *attr, char *buf) \
 346         { \
 347                 struct fscpos_data *data = fscpos_update_device(dev); \
 348                 return show_##kind##sub(data, buf); \
 349         }
 350
 351 #define create_getter_n(kind, offset, sub) \
 352         static ssize_t sysfs_show_##kind##offset##sub(struct device *dev, struct device_attribute *attr, char\
 353                                                                         *buf) \
 354         { \
 355                 struct fscpos_data *data = fscpos_update_device(dev); \
 356                 return show_##kind##sub(data, buf, offset); \
 357         }
 358
 359 #define create_setter(kind, sub, reg) \
 360         static ssize_t sysfs_set_##kind##sub (struct device *dev, struct device_attribute *attr, const char \
 361                                                         *buf, size_t count) \
 362         { \
 363                 struct i2c_client *client = to_i2c_client(dev); \
 364                 struct fscpos_data *data = i2c_get_clientdata(client); \
 365                 return set_##kind##sub(client, data, buf, count, reg); \
 366         }
 367
 368 #define create_setter_n(kind, offset, sub, reg) \
 369         static ssize_t sysfs_set_##kind##offset##sub (struct device *dev, struct device_attribute *attr, \
 370                                         const char *buf, size_t count) \
 371         { \
 372                 struct i2c_client *client = to_i2c_client(dev); \
 373                 struct fscpos_data *data = i2c_get_clientdata(client); \
 374                 return set_##kind##sub(client, data, buf, count, offset, reg);\
 375         }
 376
 377 #define create_sysfs_device_ro(kind, sub, offset) \
 378         static DEVICE_ATTR(kind##offset##sub, S_IRUGO, \
 379                                         sysfs_show_##kind##offset##sub, NULL);
 380
 381 #define create_sysfs_device_rw(kind, sub, offset) \
 382         static DEVICE_ATTR(kind##offset##sub, S_IRUGO | S_IWUSR, \
 383                 sysfs_show_##kind##offset##sub, sysfs_set_##kind##offset##sub);
 384
 385 #define sysfs_ro_n(kind, sub, offset) \
 386         create_getter_n(kind, offset, sub); \
 387         create_sysfs_device_ro(kind, sub, offset);
 388
 389 #define sysfs_rw_n(kind, sub, offset, reg) \
 390         create_getter_n(kind, offset, sub); \
 391         create_setter_n(kind, offset, sub, reg); \
 392         create_sysfs_device_rw(kind, sub, offset);
 393
 394 #define sysfs_rw(kind, sub, reg) \
 395         create_getter(kind, sub); \
 396         create_setter(kind, sub, reg); \
 397         create_sysfs_device_rw(kind, sub,);
 398
 399 #define sysfs_fan_with_min(offset, reg_status, reg_ripple, reg_min) \
 400         sysfs_fan(offset, reg_status, reg_ripple); \
 401         sysfs_rw_n(pwm,, offset, reg_min);
 402
 403 #define sysfs_fan(offset, reg_status, reg_ripple) \
 404         sysfs_ro_n(fan, _input, offset); \
 405         sysfs_ro_n(fan, _status, offset); \
 406         sysfs_rw_n(fan, _ripple, offset, reg_ripple);
 407
 408 #define sysfs_temp(offset, reg_status) \
 409         sysfs_ro_n(temp, _input, offset); \
 410         sysfs_ro_n(temp, _status, offset); \
 411         sysfs_rw_n(temp, _reset, offset, reg_status);
 412
 413 #define sysfs_watchdog(reg_wdog_preset, reg_wdog_state, reg_wdog_control) \
 414         sysfs_rw(wdog, _control, reg_wdog_control); \
 415         sysfs_rw(wdog, _preset, reg_wdog_preset); \
 416         sysfs_rw(wdog, _state, reg_wdog_state);
 417
 418 sysfs_fan_with_min(1, FSCPOS_REG_FAN_STATE[0], FSCPOS_REG_FAN_RIPPLE[0],
 419                                                         FSCPOS_REG_PWM[0]);
 420 sysfs_fan_with_min(2, FSCPOS_REG_FAN_STATE[1], FSCPOS_REG_FAN_RIPPLE[1],
 421                                                         FSCPOS_REG_PWM[1]);
 422 sysfs_fan(3, FSCPOS_REG_FAN_STATE[2], FSCPOS_REG_FAN_RIPPLE[2]);
 423
 424 sysfs_temp(1, FSCPOS_REG_TEMP_STATE[0]);
 425 sysfs_temp(2, FSCPOS_REG_TEMP_STATE[1]);
 426 sysfs_temp(3, FSCPOS_REG_TEMP_STATE[2]);
 427
 428 sysfs_watchdog(FSCPOS_REG_WDOG_PRESET, FSCPOS_REG_WDOG_STATE,
 429                                                 FSCPOS_REG_WDOG_CONTROL);
 430
 431 static DEVICE_ATTR(event, S_IRUGO, show_event, NULL);
 432 static DEVICE_ATTR(in0_input, S_IRUGO, show_volt_12, NULL);
 433 static DEVICE_ATTR(in1_input, S_IRUGO, show_volt_5, NULL);
 434 static DEVICE_ATTR(in2_input, S_IRUGO, show_volt_batt, NULL);
 435
 436 static struct attribute *fscpos_attributes[] = {
 437         &dev_attr_event.attr,
 438         &dev_attr_in0_input.attr,
 439         &dev_attr_in1_input.attr,
 440         &dev_attr_in2_input.attr,
 441
 442         &dev_attr_wdog_control.attr,
 443         &dev_attr_wdog_preset.attr,
 444         &dev_attr_wdog_state.attr,
 445
 446         &dev_attr_temp1_input.attr,
 447         &dev_attr_temp1_status.attr,
 448         &dev_attr_temp1_reset.attr,
 449         &dev_attr_temp2_input.attr,
 450         &dev_attr_temp2_status.attr,
 451         &dev_attr_temp2_reset.attr,
 452         &dev_attr_temp3_input.attr,
 453         &dev_attr_temp3_status.attr,
 454         &dev_attr_temp3_reset.attr,
 455
 456         &dev_attr_fan1_input.attr,
 457         &dev_attr_fan1_status.attr,
 458         &dev_attr_fan1_ripple.attr,
 459         &dev_attr_pwm1.attr,
 460         &dev_attr_fan2_input.attr,
 461         &dev_attr_fan2_status.attr,
 462         &dev_attr_fan2_ripple.attr,
 463         &dev_attr_pwm2.attr,
 464         &dev_attr_fan3_input.attr,
 465         &dev_attr_fan3_status.attr,
 466         &dev_attr_fan3_ripple.attr,
 467         NULL
 468 };
 469
 470 static const struct attribute_group fscpos_group = {
 471         .attrs = fscpos_attributes,
 472 };
 473
 474 static int fscpos_attach_adapter(struct i2c_adapter *adapter)
 475 {
 476         if (!(adapter->class & I2C_CLASS_HWMON))
 477                 return 0;
 478         return i2c_probe(adapter, &addr_data, fscpos_detect);
 479 }
 480
 481 static int fscpos_detect(struct i2c_adapter *adapter, int address, int kind)
 482 {
 483         struct i2c_client *new_client;
 484         struct fscpos_data *data;
 485         int err = 0;
 486
 487         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 488                 goto exit;
 489
 490         /*
 491          * OK. For now, we presume we have a valid client. We now create the
 492          * client structure, even though we cannot fill it completely yet.
 493          * But it allows us to access fscpos_{read,write}_value.
 494          */
 495
 496         if (!(data = kzalloc(sizeof(struct fscpos_data), GFP_KERNEL))) {
 497                 err = -ENOMEM;
 498                 goto exit;
 499         }
 500
 501         new_client = &data->client;
 502         i2c_set_clientdata(new_client, data);
 503         new_client->addr = address;
 504         new_client->adapter = adapter;
 505         new_client->driver = &fscpos_driver;
 506         new_client->flags = 0;
 507
 508         /* Do the remaining detection unless force or force_fscpos parameter */
 509         if (kind < 0) {
 510                 if ((fscpos_read_value(new_client, FSCPOS_REG_IDENT_0)
 511                         != 0x50) /* 'P' */
 512                 || (fscpos_read_value(new_client, FSCPOS_REG_IDENT_1)
 513                         != 0x45) /* 'E' */
 514                 || (fscpos_read_value(new_client, FSCPOS_REG_IDENT_2)
 515                         != 0x47))/* 'G' */
 516                 {
 517                         dev_dbg(&new_client->dev, "fscpos detection failed\n");
 518                         goto exit_free;
 519                 }
 520         }
 521
 522         /* Fill in the remaining client fields and put it in the global list */
 523         strlcpy(new_client->name, "fscpos", I2C_NAME_SIZE);
 524
 525         data->valid = 0;
 526         mutex_init(&data->update_lock);
 527
 528         /* Tell the I2C layer a new client has arrived */
 529         if ((err = i2c_attach_client(new_client)))
 530                 goto exit_free;
 531
 532         /* Inizialize the fscpos chip */
 533         fscpos_init_client(new_client);
 534
 535         /* Announce that the chip was found */
 536         dev_info(&new_client->dev, "Found fscpos chip, rev %u\n", data->revision);
 537
 538         /* Register sysfs hooks */
 539         if ((err = sysfs_create_group(&new_client->dev.kobj, &fscpos_group)))
 540                 goto exit_detach;
 541
 542         data->class_dev = hwmon_device_register(&new_client->dev);
 543         if (IS_ERR(data->class_dev)) {
 544                 err = PTR_ERR(data->class_dev);
 545                 goto exit_remove_files;
 546         }
 547
 548         return 0;
 549
 550 exit_remove_files:
 551         sysfs_remove_group(&new_client->dev.kobj, &fscpos_group);
 552 exit_detach:
 553         i2c_detach_client(new_client);
 554 exit_free:
 555         kfree(data);
 556 exit:
 557         return err;
 558 }
 559
 560 static int fscpos_detach_client(struct i2c_client *client)
 561 {
 562         struct fscpos_data *data = i2c_get_clientdata(client);
 563         int err;
 564
 565         hwmon_device_unregister(data->class_dev);
 566         sysfs_remove_group(&client->dev.kobj, &fscpos_group);
 567
 568         if ((err = i2c_detach_client(client)))
 569                 return err;
 570         kfree(data);
 571         return 0;
 572 }
 573
 574 static int fscpos_read_value(struct i2c_client *client, u8 reg)
 575 {
 576         dev_dbg(&client->dev, "Read reg 0x%02x\n", reg);
 577         return i2c_smbus_read_byte_data(client, reg);
 578 }
 579
 580 static int fscpos_write_value(struct i2c_client *client, u8 reg, u8 value)
 581 {
 582         dev_dbg(&client->dev, "Write reg 0x%02x, val 0x%02x\n", reg, value);
 583         return i2c_smbus_write_byte_data(client, reg, value);
 584 }
 585
 586 /* Called when we have found a new FSCPOS chip */
 587 static void fscpos_init_client(struct i2c_client *client)
 588 {
 589         struct fscpos_data *data = i2c_get_clientdata(client);
 590
 591         /* read revision from chip */
 592         data->revision = fscpos_read_value(client, FSCPOS_REG_REVISION);
 593 }
 594
 595 static struct fscpos_data *fscpos_update_device(struct device *dev)
 596 {
 597         struct i2c_client *client = to_i2c_client(dev);
 598         struct fscpos_data *data = i2c_get_clientdata(client);
 599
 600         mutex_lock(&data->update_lock);
 601
 602         if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
 603                 int i;
 604
 605                 dev_dbg(&client->dev, "Starting fscpos update\n");
 606
 607                 for (i = 0; i < 3; i++) {
 608                         data->temp_act[i] = fscpos_read_value(client,
 609                                                 FSCPOS_REG_TEMP_ACT[i]);
 610                         data->temp_status[i] = fscpos_read_value(client,
 611                                                 FSCPOS_REG_TEMP_STATE[i]);
 612                         data->fan_act[i] = fscpos_read_value(client,
 613                                                 FSCPOS_REG_FAN_ACT[i]);
 614                         data->fan_status[i] = fscpos_read_value(client,
 615                                                 FSCPOS_REG_FAN_STATE[i]);
 616                         data->fan_ripple[i] = fscpos_read_value(client,
 617                                                 FSCPOS_REG_FAN_RIPPLE[i]);
 618                         if (i < 2) {
 619                                 /* fan2_min is not supported by the chip */
 620                                 data->pwm[i] = fscpos_read_value(client,
 621                                                         FSCPOS_REG_PWM[i]);
 622                         }
 623                         /* reset fan status if speed is back to > 0 */
 624                         if (data->fan_status[i] != 0 && data->fan_act[i] > 0) {
 625                                 reset_fan_alarm(client, i);
 626                         }
 627                 }
 628
 629                 data->volt[0] = fscpos_read_value(client, FSCPOS_REG_VOLT_12);
 630                 data->volt[1] = fscpos_read_value(client, FSCPOS_REG_VOLT_5);
 631                 data->volt[2] = fscpos_read_value(client, FSCPOS_REG_VOLT_BATT);
 632
 633                 data->wdog_preset = fscpos_read_value(client,
 634                                                         FSCPOS_REG_WDOG_PRESET);
 635                 data->wdog_state = fscpos_read_value(client,
 636                                                         FSCPOS_REG_WDOG_STATE);
 637                 data->wdog_control = fscpos_read_value(client,
 638                                                 FSCPOS_REG_WDOG_CONTROL);
 639
 640                 data->global_event = fscpos_read_value(client,
 641                                                 FSCPOS_REG_EVENT_STATE);
 642
 643                 data->last_updated = jiffies;
 644                 data->valid = 1;
 645         }
 646         mutex_unlock(&data->update_lock);
 647         return data;
 648 }
 649
 650 static int __init sm_fscpos_init(void)
 651 {
 652         return i2c_add_driver(&fscpos_driver);
 653 }
 654
 655 static void __exit sm_fscpos_exit(void)
 656 {
 657         i2c_del_driver(&fscpos_driver);
 658 }
 659
 660 MODULE_AUTHOR("Stefan Ott <stefan@desire.ch> based on work from Hermann Jung "
 661                                 "<hej@odn.de>, Frodo Looijaard <frodol@dds.nl>"
 662                                 " and Philip Edelbrock <phil@netroedge.com>");
 663 MODULE_DESCRIPTION("fujitsu siemens poseidon chip driver");
 664 MODULE_LICENSE("GPL");
 665
 666 module_init(sm_fscpos_init);
 667 module_exit(sm_fscpos_exit);