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 <<<<<<< HEAD:drivers/hwmon/fscpos.c
  47 static unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END };
  48 =======
  49 static const unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END };
  50 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/hwmon/fscpos.c
  51
  52 /*
  53  * Insmod parameters
  54  */
  55 I2C_CLIENT_INSMOD_1(fscpos);
  56
  57 /*
  58  * The FSCPOS registers
  59  */
  60
  61 /* chip identification */
  62 #define FSCPOS_REG_IDENT_0              0x00
  63 #define FSCPOS_REG_IDENT_1              0x01
  64 #define FSCPOS_REG_IDENT_2              0x02
  65 #define FSCPOS_REG_REVISION             0x03
  66
  67 /* global control and status */
  68 #define FSCPOS_REG_EVENT_STATE          0x04
  69 #define FSCPOS_REG_CONTROL              0x05
  70
  71 /* watchdog */
  72 #define FSCPOS_REG_WDOG_PRESET          0x28
  73 #define FSCPOS_REG_WDOG_STATE           0x23
  74 #define FSCPOS_REG_WDOG_CONTROL         0x21
  75
  76 /* voltages */
  77 #define FSCPOS_REG_VOLT_12              0x45
  78 #define FSCPOS_REG_VOLT_5               0x42
  79 #define FSCPOS_REG_VOLT_BATT            0x48
  80
  81 /* fans - the chip does not support minimum speed for fan2 */
  82 static u8 FSCPOS_REG_PWM[] = { 0x55, 0x65 };
  83 static u8 FSCPOS_REG_FAN_ACT[] = { 0x0e, 0x6b, 0xab };
  84 static u8 FSCPOS_REG_FAN_STATE[] = { 0x0d, 0x62, 0xa2 };
  85 static u8 FSCPOS_REG_FAN_RIPPLE[] = { 0x0f, 0x6f, 0xaf };
  86
  87 /* temperatures */
  88 static u8 FSCPOS_REG_TEMP_ACT[] = { 0x64, 0x32, 0x35 };
  89 static u8 FSCPOS_REG_TEMP_STATE[] = { 0x71, 0x81, 0x91 };
  90
  91 /*
  92  * Functions declaration
  93  */
  94 static int fscpos_attach_adapter(struct i2c_adapter *adapter);
  95 static int fscpos_detect(struct i2c_adapter *adapter, int address, int kind);
  96 static int fscpos_detach_client(struct i2c_client *client);
  97
  98 static int fscpos_read_value(struct i2c_client *client, u8 reg);
  99 static int fscpos_write_value(struct i2c_client *client, u8 reg, u8 value);
 100 static struct fscpos_data *fscpos_update_device(struct device *dev);
 101 static void fscpos_init_client(struct i2c_client *client);
 102
 103 static void reset_fan_alarm(struct i2c_client *client, int nr);
 104
 105 /*
 106  * Driver data (common to all clients)
 107  */
 108 static struct i2c_driver fscpos_driver = {
 109         .driver = {
 110                 .name   = "fscpos",
 111         },
 112         .attach_adapter = fscpos_attach_adapter,
 113         .detach_client  = fscpos_detach_client,
 114 };
 115
 116 /*
 117  * Client data (each client gets its own)
 118  */
 119 struct fscpos_data {
 120         struct i2c_client client;
 121         struct device *hwmon_dev;
 122         struct mutex update_lock;
 123         char valid;             /* 0 until following fields are valid */
 124         unsigned long last_updated;     /* In jiffies */
 125
 126         /* register values */
 127         u8 revision;            /* revision of chip */
 128         u8 global_event;        /* global event status */
 129         u8 global_control;      /* global control register */
 130         u8 wdog_control;        /* watchdog control */
 131         u8 wdog_state;          /* watchdog status */
 132         u8 wdog_preset;         /* watchdog preset */
 133         u8 volt[3];             /* 12, 5, battery current */
 134         u8 temp_act[3];         /* temperature */
 135         u8 temp_status[3];      /* status of sensor */
 136         u8 fan_act[3];          /* fans revolutions per second */
 137         u8 fan_status[3];       /* fan status */
 138         u8 pwm[2];              /* fan min value for rps */
 139         u8 fan_ripple[3];       /* divider for rps */
 140 };
 141
 142 /* Temperature */
 143 #define TEMP_FROM_REG(val)      (((val) - 128) * 1000)
 144
 145 static ssize_t show_temp_input(struct fscpos_data *data, char *buf, int nr)
 146 {
 147         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_act[nr - 1]));
 148 }
 149
 150 static ssize_t show_temp_status(struct fscpos_data *data, char *buf, int nr)
 151 {
 152         /* bits 2..7 reserved => mask with 0x03 */
 153         return sprintf(buf, "%u\n", data->temp_status[nr - 1] & 0x03);
 154 }
 155
 156 static ssize_t show_temp_reset(struct fscpos_data *data, char *buf, int nr)
 157 {
 158         return sprintf(buf, "1\n");
 159 }
 160
 161 static ssize_t set_temp_reset(struct i2c_client *client, struct fscpos_data
 162                         *data, const char *buf, size_t count, int nr, int reg)
 163 {
 164         unsigned long v = simple_strtoul(buf, NULL, 10);
 165         if (v != 1) {
 166                 dev_err(&client->dev, "temp_reset value %ld not supported. "
 167                                         "Use 1 to reset the alarm!\n", v);
 168                 return -EINVAL;
 169         }
 170
 171         dev_info(&client->dev, "You used the temp_reset feature which has not "
 172                                 "been proplerly tested. Please report your "
 173                                 "experience to the module author.\n");
 174
 175         /* Supported value: 2 (clears the status) */
 176         fscpos_write_value(client, FSCPOS_REG_TEMP_STATE[nr - 1], 2);
 177         return count;
 178 }
 179
 180 /* Fans */
 181 #define RPM_FROM_REG(val)       ((val) * 60)
 182
 183 static ssize_t show_fan_status(struct fscpos_data *data, char *buf, int nr)
 184 {
 185         /* bits 0..1, 3..7 reserved => mask with 0x04 */
 186         return sprintf(buf, "%u\n", data->fan_status[nr - 1] & 0x04);
 187 }
 188
 189 static ssize_t show_fan_input(struct fscpos_data *data, char *buf, int nr)
 190 {
 191         return sprintf(buf, "%u\n", RPM_FROM_REG(data->fan_act[nr - 1]));
 192 }
 193
 194 static ssize_t show_fan_ripple(struct fscpos_data *data, char *buf, int nr)
 195 {
 196         /* bits 2..7 reserved => mask with 0x03 */
 197         return sprintf(buf, "%u\n", data->fan_ripple[nr - 1] & 0x03);
 198 }
 199
 200 static ssize_t set_fan_ripple(struct i2c_client *client, struct fscpos_data
 201                         *data, const char *buf, size_t count, int nr, int reg)
 202 {
 203         /* supported values: 2, 4, 8 */
 204         unsigned long v = simple_strtoul(buf, NULL, 10);
 205
 206         switch (v) {
 207                 case 2: v = 1; break;
 208                 case 4: v = 2; break;
 209                 case 8: v = 3; break;
 210         default:
 211                 dev_err(&client->dev, "fan_ripple value %ld not supported. "
 212                                         "Must be one of 2, 4 or 8!\n", v);
 213                 return -EINVAL;
 214         }
 215
 216         mutex_lock(&data->update_lock);
 217         /* bits 2..7 reserved => mask with 0x03 */
 218         data->fan_ripple[nr - 1] &= ~0x03;
 219         data->fan_ripple[nr - 1] |= v;
 220
 221         fscpos_write_value(client, reg, data->fan_ripple[nr - 1]);
 222         mutex_unlock(&data->update_lock);
 223         return count;
 224 }
 225
 226 static ssize_t show_pwm(struct fscpos_data *data, char *buf, int nr)
 227 {
 228         return sprintf(buf, "%u\n", data->pwm[nr - 1]);
 229 }
 230
 231 static ssize_t set_pwm(struct i2c_client *client, struct fscpos_data *data,
 232                                 const char *buf, size_t count, int nr, int reg)
 233 {
 234         unsigned long v = simple_strtoul(buf, NULL, 10);
 235
 236         /* Range: 0..255 */
 237         if (v < 0) v = 0;
 238         if (v > 255) v = 255;
 239
 240         mutex_lock(&data->update_lock);
 241         data->pwm[nr - 1] = v;
 242         fscpos_write_value(client, reg, data->pwm[nr - 1]);
 243         mutex_unlock(&data->update_lock);
 244         return count;
 245 }
 246
 247 static void reset_fan_alarm(struct i2c_client *client, int nr)
 248 {
 249         fscpos_write_value(client, FSCPOS_REG_FAN_STATE[nr], 4);
 250 }
 251
 252 /* Volts */
 253 #define VOLT_FROM_REG(val, mult)        ((val) * (mult) / 255)
 254
 255 static ssize_t show_volt_12(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[0], 14200));
 259 }
 260
 261 static ssize_t show_volt_5(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[1], 6600));
 265 }
 266
 267 static ssize_t show_volt_batt(struct device *dev, struct device_attribute *attr, char *buf)
 268 {
 269         struct fscpos_data *data = fscpos_update_device(dev);
 270         return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[2], 3300));
 271 }
 272
 273 /* Watchdog */
 274 static ssize_t show_wdog_control(struct fscpos_data *data, char *buf)
 275 {
 276         /* bits 0..3 reserved, bit 6 write only => mask with 0xb0 */
 277         return sprintf(buf, "%u\n", data->wdog_control & 0xb0);
 278 }
 279
 280 static ssize_t set_wdog_control(struct i2c_client *client, struct fscpos_data
 281                                 *data, const char *buf, size_t count, int reg)
 282 {
 283         /* bits 0..3 reserved => mask with 0xf0 */
 284         unsigned long v = simple_strtoul(buf, NULL, 10) & 0xf0;
 285
 286         mutex_lock(&data->update_lock);
 287         data->wdog_control &= ~0xf0;
 288         data->wdog_control |= v;
 289         fscpos_write_value(client, reg, data->wdog_control);
 290         mutex_unlock(&data->update_lock);
 291         return count;
 292 }
 293
 294 static ssize_t show_wdog_state(struct fscpos_data *data, char *buf)
 295 {
 296         /* bits 0, 2..7 reserved => mask with 0x02 */
 297         return sprintf(buf, "%u\n", data->wdog_state & 0x02);
 298 }
 299
 300 static ssize_t set_wdog_state(struct i2c_client *client, struct fscpos_data
 301                                 *data, const char *buf, size_t count, int reg)
 302 {
 303         unsigned long v = simple_strtoul(buf, NULL, 10) & 0x02;
 304
 305         /* Valid values: 2 (clear) */
 306         if (v != 2) {
 307                 dev_err(&client->dev, "wdog_state value %ld not supported. "
 308                                         "Must be 2 to clear the state!\n", v);
 309                 return -EINVAL;
 310         }
 311
 312         mutex_lock(&data->update_lock);
 313         data->wdog_state &= ~v;
 314         fscpos_write_value(client, reg, v);
 315         mutex_unlock(&data->update_lock);
 316         return count;
 317 }
 318
 319 static ssize_t show_wdog_preset(struct fscpos_data *data, char *buf)
 320 {
 321         return sprintf(buf, "%u\n", data->wdog_preset);
 322 }
 323
 324 static ssize_t set_wdog_preset(struct i2c_client *client, struct fscpos_data
 325                                 *data, const char *buf, size_t count, int reg)
 326 {
 327         unsigned long v = simple_strtoul(buf, NULL, 10) & 0xff;
 328
 329         mutex_lock(&data->update_lock);
 330         data->wdog_preset = v;
 331         fscpos_write_value(client, reg, data->wdog_preset);
 332         mutex_unlock(&data->update_lock);
 333         return count;
 334 }
 335
 336 /* Event */
 337 static ssize_t show_event(struct device *dev, struct device_attribute *attr, char *buf)
 338 {
 339         /* bits 5..7 reserved => mask with 0x1f */
 340         struct fscpos_data *data = fscpos_update_device(dev);
 341         return sprintf(buf, "%u\n", data->global_event & 0x9b);
 342 }
 343
 344 /*
 345  * Sysfs stuff
 346  */
 347 #define create_getter(kind, sub) \
 348         static ssize_t sysfs_show_##kind##sub(struct device *dev, struct device_attribute *attr, char *buf) \
 349         { \
 350                 struct fscpos_data *data = fscpos_update_device(dev); \
 351                 return show_##kind##sub(data, buf); \
 352         }
 353
 354 #define create_getter_n(kind, offset, sub) \
 355         static ssize_t sysfs_show_##kind##offset##sub(struct device *dev, struct device_attribute *attr, char\
 356                                                                         *buf) \
 357         { \
 358                 struct fscpos_data *data = fscpos_update_device(dev); \
 359                 return show_##kind##sub(data, buf, offset); \
 360         }
 361
 362 #define create_setter(kind, sub, reg) \
 363         static ssize_t sysfs_set_##kind##sub (struct device *dev, struct device_attribute *attr, const char \
 364                                                         *buf, size_t count) \
 365         { \
 366                 struct i2c_client *client = to_i2c_client(dev); \
 367                 struct fscpos_data *data = i2c_get_clientdata(client); \
 368                 return set_##kind##sub(client, data, buf, count, reg); \
 369         }
 370
 371 #define create_setter_n(kind, offset, sub, reg) \
 372         static ssize_t sysfs_set_##kind##offset##sub (struct device *dev, struct device_attribute *attr, \
 373                                         const char *buf, size_t count) \
 374         { \
 375                 struct i2c_client *client = to_i2c_client(dev); \
 376                 struct fscpos_data *data = i2c_get_clientdata(client); \
 377                 return set_##kind##sub(client, data, buf, count, offset, reg);\
 378         }
 379
 380 #define create_sysfs_device_ro(kind, sub, offset) \
 381         static DEVICE_ATTR(kind##offset##sub, S_IRUGO, \
 382                                         sysfs_show_##kind##offset##sub, NULL);
 383
 384 #define create_sysfs_device_rw(kind, sub, offset) \
 385         static DEVICE_ATTR(kind##offset##sub, S_IRUGO | S_IWUSR, \
 386                 sysfs_show_##kind##offset##sub, sysfs_set_##kind##offset##sub);
 387
 388 #define sysfs_ro_n(kind, sub, offset) \
 389         create_getter_n(kind, offset, sub); \
 390         create_sysfs_device_ro(kind, sub, offset);
 391
 392 #define sysfs_rw_n(kind, sub, offset, reg) \
 393         create_getter_n(kind, offset, sub); \
 394         create_setter_n(kind, offset, sub, reg); \
 395         create_sysfs_device_rw(kind, sub, offset);
 396
 397 #define sysfs_rw(kind, sub, reg) \
 398         create_getter(kind, sub); \
 399         create_setter(kind, sub, reg); \
 400         create_sysfs_device_rw(kind, sub,);
 401
 402 #define sysfs_fan_with_min(offset, reg_status, reg_ripple, reg_min) \
 403         sysfs_fan(offset, reg_status, reg_ripple); \
 404         sysfs_rw_n(pwm,, offset, reg_min);
 405
 406 #define sysfs_fan(offset, reg_status, reg_ripple) \
 407         sysfs_ro_n(fan, _input, offset); \
 408         sysfs_ro_n(fan, _status, offset); \
 409         sysfs_rw_n(fan, _ripple, offset, reg_ripple);
 410
 411 #define sysfs_temp(offset, reg_status) \
 412         sysfs_ro_n(temp, _input, offset); \
 413         sysfs_ro_n(temp, _status, offset); \
 414         sysfs_rw_n(temp, _reset, offset, reg_status);
 415
 416 #define sysfs_watchdog(reg_wdog_preset, reg_wdog_state, reg_wdog_control) \
 417         sysfs_rw(wdog, _control, reg_wdog_control); \
 418         sysfs_rw(wdog, _preset, reg_wdog_preset); \
 419         sysfs_rw(wdog, _state, reg_wdog_state);
 420
 421 sysfs_fan_with_min(1, FSCPOS_REG_FAN_STATE[0], FSCPOS_REG_FAN_RIPPLE[0],
 422                                                         FSCPOS_REG_PWM[0]);
 423 sysfs_fan_with_min(2, FSCPOS_REG_FAN_STATE[1], FSCPOS_REG_FAN_RIPPLE[1],
 424                                                         FSCPOS_REG_PWM[1]);
 425 sysfs_fan(3, FSCPOS_REG_FAN_STATE[2], FSCPOS_REG_FAN_RIPPLE[2]);
 426
 427 sysfs_temp(1, FSCPOS_REG_TEMP_STATE[0]);
 428 sysfs_temp(2, FSCPOS_REG_TEMP_STATE[1]);
 429 sysfs_temp(3, FSCPOS_REG_TEMP_STATE[2]);
 430
 431 sysfs_watchdog(FSCPOS_REG_WDOG_PRESET, FSCPOS_REG_WDOG_STATE,
 432                                                 FSCPOS_REG_WDOG_CONTROL);
 433
 434 static DEVICE_ATTR(event, S_IRUGO, show_event, NULL);
 435 static DEVICE_ATTR(in0_input, S_IRUGO, show_volt_12, NULL);
 436 static DEVICE_ATTR(in1_input, S_IRUGO, show_volt_5, NULL);
 437 static DEVICE_ATTR(in2_input, S_IRUGO, show_volt_batt, NULL);
 438
 439 static struct attribute *fscpos_attributes[] = {
 440         &dev_attr_event.attr,
 441         &dev_attr_in0_input.attr,
 442         &dev_attr_in1_input.attr,
 443         &dev_attr_in2_input.attr,
 444
 445         &dev_attr_wdog_control.attr,
 446         &dev_attr_wdog_preset.attr,
 447         &dev_attr_wdog_state.attr,
 448
 449         &dev_attr_temp1_input.attr,
 450         &dev_attr_temp1_status.attr,
 451         &dev_attr_temp1_reset.attr,
 452         &dev_attr_temp2_input.attr,
 453         &dev_attr_temp2_status.attr,
 454         &dev_attr_temp2_reset.attr,
 455         &dev_attr_temp3_input.attr,
 456         &dev_attr_temp3_status.attr,
 457         &dev_attr_temp3_reset.attr,
 458
 459         &dev_attr_fan1_input.attr,
 460         &dev_attr_fan1_status.attr,
 461         &dev_attr_fan1_ripple.attr,
 462         &dev_attr_pwm1.attr,
 463         &dev_attr_fan2_input.attr,
 464         &dev_attr_fan2_status.attr,
 465         &dev_attr_fan2_ripple.attr,
 466         &dev_attr_pwm2.attr,
 467         &dev_attr_fan3_input.attr,
 468         &dev_attr_fan3_status.attr,
 469         &dev_attr_fan3_ripple.attr,
 470         NULL
 471 };
 472
 473 static const struct attribute_group fscpos_group = {
 474         .attrs = fscpos_attributes,
 475 };
 476
 477 static int fscpos_attach_adapter(struct i2c_adapter *adapter)
 478 {
 479         if (!(adapter->class & I2C_CLASS_HWMON))
 480                 return 0;
 481         return i2c_probe(adapter, &addr_data, fscpos_detect);
 482 }
 483
 484 static int fscpos_detect(struct i2c_adapter *adapter, int address, int kind)
 485 {
 486         struct i2c_client *new_client;
 487         struct fscpos_data *data;
 488         int err = 0;
 489
 490         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 491                 goto exit;
 492
 493         /*
 494          * OK. For now, we presume we have a valid client. We now create the
 495          * client structure, even though we cannot fill it completely yet.
 496          * But it allows us to access fscpos_{read,write}_value.
 497          */
 498
 499         if (!(data = kzalloc(sizeof(struct fscpos_data), GFP_KERNEL))) {
 500                 err = -ENOMEM;
 501                 goto exit;
 502         }
 503
 504         new_client = &data->client;
 505         i2c_set_clientdata(new_client, data);
 506         new_client->addr = address;
 507         new_client->adapter = adapter;
 508         new_client->driver = &fscpos_driver;
 509         new_client->flags = 0;
 510
 511         /* Do the remaining detection unless force or force_fscpos parameter */
 512         if (kind < 0) {
 513                 if ((fscpos_read_value(new_client, FSCPOS_REG_IDENT_0)
 514                         != 0x50) /* 'P' */
 515                 || (fscpos_read_value(new_client, FSCPOS_REG_IDENT_1)
 516                         != 0x45) /* 'E' */
 517                 || (fscpos_read_value(new_client, FSCPOS_REG_IDENT_2)
 518                         != 0x47))/* 'G' */
 519                 {
 520                         dev_dbg(&new_client->dev, "fscpos detection failed\n");
 521                         goto exit_free;
 522                 }
 523         }
 524
 525         /* Fill in the remaining client fields and put it in the global list */
 526         strlcpy(new_client->name, "fscpos", I2C_NAME_SIZE);
 527
 528         data->valid = 0;
 529         mutex_init(&data->update_lock);
 530
 531         /* Tell the I2C layer a new client has arrived */
 532         if ((err = i2c_attach_client(new_client)))
 533                 goto exit_free;
 534
 535         /* Inizialize the fscpos chip */
 536         fscpos_init_client(new_client);
 537
 538         /* Announce that the chip was found */
 539         dev_info(&new_client->dev, "Found fscpos chip, rev %u\n", data->revision);
 540
 541         /* Register sysfs hooks */
 542         if ((err = sysfs_create_group(&new_client->dev.kobj, &fscpos_group)))
 543                 goto exit_detach;
 544
 545         data->hwmon_dev = hwmon_device_register(&new_client->dev);
 546         if (IS_ERR(data->hwmon_dev)) {
 547                 err = PTR_ERR(data->hwmon_dev);
 548                 goto exit_remove_files;
 549         }
 550
 551         return 0;
 552
 553 exit_remove_files:
 554         sysfs_remove_group(&new_client->dev.kobj, &fscpos_group);
 555 exit_detach:
 556         i2c_detach_client(new_client);
 557 exit_free:
 558         kfree(data);
 559 exit:
 560         return err;
 561 }
 562
 563 static int fscpos_detach_client(struct i2c_client *client)
 564 {
 565         struct fscpos_data *data = i2c_get_clientdata(client);
 566         int err;
 567
 568         hwmon_device_unregister(data->hwmon_dev);
 569         sysfs_remove_group(&client->dev.kobj, &fscpos_group);
 570
 571         if ((err = i2c_detach_client(client)))
 572                 return err;
 573         kfree(data);
 574         return 0;
 575 }
 576
 577 static int fscpos_read_value(struct i2c_client *client, u8 reg)
 578 {
 579         dev_dbg(&client->dev, "Read reg 0x%02x\n", reg);
 580         return i2c_smbus_read_byte_data(client, reg);
 581 }
 582
 583 static int fscpos_write_value(struct i2c_client *client, u8 reg, u8 value)
 584 {
 585         dev_dbg(&client->dev, "Write reg 0x%02x, val 0x%02x\n", reg, value);
 586         return i2c_smbus_write_byte_data(client, reg, value);
 587 }
 588
 589 /* Called when we have found a new FSCPOS chip */
 590 static void fscpos_init_client(struct i2c_client *client)
 591 {
 592         struct fscpos_data *data = i2c_get_clientdata(client);
 593
 594         /* read revision from chip */
 595         data->revision = fscpos_read_value(client, FSCPOS_REG_REVISION);
 596 }
 597
 598 static struct fscpos_data *fscpos_update_device(struct device *dev)
 599 {
 600         struct i2c_client *client = to_i2c_client(dev);
 601         struct fscpos_data *data = i2c_get_clientdata(client);
 602
 603         mutex_lock(&data->update_lock);
 604
 605         if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
 606                 int i;
 607
 608                 dev_dbg(&client->dev, "Starting fscpos update\n");
 609
 610                 for (i = 0; i < 3; i++) {
 611                         data->temp_act[i] = fscpos_read_value(client,
 612                                                 FSCPOS_REG_TEMP_ACT[i]);
 613                         data->temp_status[i] = fscpos_read_value(client,
 614                                                 FSCPOS_REG_TEMP_STATE[i]);
 615                         data->fan_act[i] = fscpos_read_value(client,
 616                                                 FSCPOS_REG_FAN_ACT[i]);
 617                         data->fan_status[i] = fscpos_read_value(client,
 618                                                 FSCPOS_REG_FAN_STATE[i]);
 619                         data->fan_ripple[i] = fscpos_read_value(client,
 620                                                 FSCPOS_REG_FAN_RIPPLE[i]);
 621                         if (i < 2) {
 622                                 /* fan2_min is not supported by the chip */
 623                                 data->pwm[i] = fscpos_read_value(client,
 624                                                         FSCPOS_REG_PWM[i]);
 625                         }
 626                         /* reset fan status if speed is back to > 0 */
 627                         if (data->fan_status[i] != 0 && data->fan_act[i] > 0) {
 628                                 reset_fan_alarm(client, i);
 629                         }
 630                 }
 631
 632                 data->volt[0] = fscpos_read_value(client, FSCPOS_REG_VOLT_12);
 633                 data->volt[1] = fscpos_read_value(client, FSCPOS_REG_VOLT_5);
 634                 data->volt[2] = fscpos_read_value(client, FSCPOS_REG_VOLT_BATT);
 635
 636                 data->wdog_preset = fscpos_read_value(client,
 637                                                         FSCPOS_REG_WDOG_PRESET);
 638                 data->wdog_state = fscpos_read_value(client,
 639                                                         FSCPOS_REG_WDOG_STATE);
 640                 data->wdog_control = fscpos_read_value(client,
 641                                                 FSCPOS_REG_WDOG_CONTROL);
 642
 643                 data->global_event = fscpos_read_value(client,
 644                                                 FSCPOS_REG_EVENT_STATE);
 645
 646                 data->last_updated = jiffies;
 647                 data->valid = 1;
 648         }
 649         mutex_unlock(&data->update_lock);
 650         return data;
 651 }
 652
 653 static int __init sm_fscpos_init(void)
 654 {
 655         return i2c_add_driver(&fscpos_driver);
 656 }
 657
 658 static void __exit sm_fscpos_exit(void)
 659 {
 660         i2c_del_driver(&fscpos_driver);
 661 }
 662
 663 MODULE_AUTHOR("Stefan Ott <stefan@desire.ch> based on work from Hermann Jung "
 664                                 "<hej@odn.de>, Frodo Looijaard <frodol@dds.nl>"
 665                                 " and Philip Edelbrock <phil@netroedge.com>");
 666 MODULE_DESCRIPTION("fujitsu siemens poseidon chip driver");
 667 MODULE_LICENSE("GPL");
 668
 669 module_init(sm_fscpos_init);
 670 module_exit(sm_fscpos_exit);