drivers/hwmon/vt8231.c

   1 /*
   2         vt8231.c - Part of lm_sensors, Linux kernel modules
   3                                 for hardware monitoring
   4
   5         Copyright (c) 2005 Roger Lucas <roger@planbit.co.uk>
   6         Copyright (c) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
   7                            Aaron M. Marsh <amarsh@sdf.lonestar.org>
   8
   9         This program is free software; you can redistribute it and/or modify
  10         it under the terms of the GNU General Public License as published by
  11         the Free Software Foundation; either version 2 of the License, or
  12         (at your option) any later version.
  13
  14         This program is distributed in the hope that it will be useful,
  15         but WITHOUT ANY WARRANTY; without even the implied warranty of
  16         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17         GNU General Public License for more details.
  18
  19         You should have received a copy of the GNU General Public License
  20         along with this program; if not, write to the Free Software
  21         Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 /* Supports VIA VT8231 South Bridge embedded sensors
  25 */
  26
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/slab.h>
  30 #include <linux/pci.h>
  31 #include <linux/jiffies.h>
  32 #include <linux/platform_device.h>
  33 #include <linux/hwmon.h>
  34 #include <linux/hwmon-sysfs.h>
  35 #include <linux/hwmon-vid.h>
  36 #include <linux/err.h>
  37 #include <linux/mutex.h>
  38 #include <asm/io.h>
  39
  40 static int force_addr;
  41 module_param(force_addr, int, 0);
  42 MODULE_PARM_DESC(force_addr, "Initialize the base address of the sensors");
  43
  44 static struct platform_device *pdev;
  45
  46 #define VT8231_EXTENT 0x80
  47 #define VT8231_BASE_REG 0x70
  48 #define VT8231_ENABLE_REG 0x74
  49
  50 /* The VT8231 registers
  51
  52    The reset value for the input channel configuration is used (Reg 0x4A=0x07)
  53    which sets the selected inputs marked with '*' below if multiple options are
  54    possible:
  55
  56                     Voltage Mode          Temperature Mode
  57         Sensor        Linux Id        Linux Id        VIA Id
  58         --------      --------        --------        ------
  59         CPU Diode       N/A             temp1           0
  60         UIC1            in0             temp2 *         1
  61         UIC2            in1 *           temp3           2
  62         UIC3            in2 *           temp4           3
  63         UIC4            in3 *           temp5           4
  64         UIC5            in4 *           temp6           5
  65         3.3V            in5             N/A
  66
  67    Note that the BIOS may set the configuration register to a different value
  68    to match the motherboard configuration.
  69 */
  70
  71 /* fans numbered 0-1 */
  72 #define VT8231_REG_FAN_MIN(nr)  (0x3b + (nr))
  73 #define VT8231_REG_FAN(nr)      (0x29 + (nr))
  74
  75 /* Voltage inputs numbered 0-5 */
  76
  77 static const u8 regvolt[]    = { 0x21, 0x22, 0x23, 0x24, 0x25, 0x26 };
  78 static const u8 regvoltmax[] = { 0x3d, 0x2b, 0x2d, 0x2f, 0x31, 0x33 };
  79 static const u8 regvoltmin[] = { 0x3e, 0x2c, 0x2e, 0x30, 0x32, 0x34 };
  80
  81 /* Temperatures are numbered 1-6 according to the Linux kernel specification.
  82 **
  83 ** In the VIA datasheet, however, the temperatures are numbered from zero.
  84 ** Since it is important that this driver can easily be compared to the VIA
  85 ** datasheet, we will use the VIA numbering within this driver and map the
  86 ** kernel sysfs device name to the VIA number in the sysfs callback.
  87 */
  88
  89 #define VT8231_REG_TEMP_LOW01   0x49
  90 #define VT8231_REG_TEMP_LOW25   0x4d
  91
  92 static const u8 regtemp[]    = { 0x1f, 0x21, 0x22, 0x23, 0x24, 0x25 };
  93 static const u8 regtempmax[] = { 0x39, 0x3d, 0x2b, 0x2d, 0x2f, 0x31 };
  94 static const u8 regtempmin[] = { 0x3a, 0x3e, 0x2c, 0x2e, 0x30, 0x32 };
  95
  96 #define TEMP_FROM_REG(reg)              (((253 * 4 - (reg)) * 550 + 105) / 210)
  97 #define TEMP_MAXMIN_FROM_REG(reg)       (((253 - (reg)) * 2200 + 105) / 210)
  98 #define TEMP_MAXMIN_TO_REG(val)         (253 - ((val) * 210 + 1100) / 2200)
  99
 100 #define VT8231_REG_CONFIG 0x40
 101 #define VT8231_REG_ALARM1 0x41
 102 #define VT8231_REG_ALARM2 0x42
 103 #define VT8231_REG_FANDIV 0x47
 104 #define VT8231_REG_UCH_CONFIG 0x4a
 105 #define VT8231_REG_TEMP1_CONFIG 0x4b
 106 #define VT8231_REG_TEMP2_CONFIG 0x4c
 107
 108 /* temps 0-5 as numbered in VIA datasheet - see later for mapping to Linux
 109 ** numbering
 110 */
 111 #define ISTEMP(i, ch_config) ((i) == 0 ? 1 : \
 112                               ((ch_config) >> ((i)+1)) & 0x01)
 113 /* voltages 0-5 */
 114 #define ISVOLT(i, ch_config) ((i) == 5 ? 1 : \
 115                               !(((ch_config) >> ((i)+2)) & 0x01))
 116
 117 #define DIV_FROM_REG(val) (1 << (val))
 118
 119 /* NB  The values returned here are NOT temperatures.  The calibration curves
 120 **     for the thermistor curves are board-specific and must go in the
 121 **     sensors.conf file.  Temperature sensors are actually ten bits, but the
 122 **     VIA datasheet only considers the 8 MSBs obtained from the regtemp[]
 123 **     register.  The temperature value returned should have a magnitude of 3,
 124 **     so we use the VIA scaling as the "true" scaling and use the remaining 2
 125 **     LSBs as fractional precision.
 126 **
 127 **     All the on-chip hardware temperature comparisons for the alarms are only
 128 **     8-bits wide, and compare against the 8 MSBs of the temperature.  The bits
 129 **     in the registers VT8231_REG_TEMP_LOW01 and VT8231_REG_TEMP_LOW25 are
 130 **     ignored.
 131 */
 132
 133 /******** FAN RPM CONVERSIONS ********
 134 ** This chip saturates back at 0, not at 255 like many the other chips.
 135 ** So, 0 means 0 RPM
 136 */
 137 static inline u8 FAN_TO_REG(long rpm, int div)
 138 {
 139         if (rpm == 0)
 140                 return 0;
 141         return SENSORS_LIMIT(1310720 / (rpm * div), 1, 255);
 142 }
 143
 144 #define FAN_FROM_REG(val, div) ((val) == 0 ? 0 : 1310720 / ((val) * (div)))
 145
 146 struct vt8231_data {
 147         unsigned short addr;
 148         const char *name;
 149
 150         struct mutex update_lock;
 151         struct class_device *class_dev;
 152         char valid;             /* !=0 if following fields are valid */
 153         unsigned long last_updated;     /* In jiffies */
 154
 155         u8 in[6];               /* Register value */
 156         u8 in_max[6];           /* Register value */
 157         u8 in_min[6];           /* Register value */
 158         u16 temp[6];            /* Register value 10 bit, right aligned */
 159         u8 temp_max[6];         /* Register value */
 160         u8 temp_min[6];         /* Register value */
 161         u8 fan[2];              /* Register value */
 162         u8 fan_min[2];          /* Register value */
 163         u8 fan_div[2];          /* Register encoding, shifted right */
 164         u16 alarms;             /* Register encoding */
 165         u8 uch_config;
 166 };
 167
 168 static struct pci_dev *s_bridge;
 169 static int vt8231_probe(struct platform_device *pdev);
 170 static int __devexit vt8231_remove(struct platform_device *pdev);
 171 static struct vt8231_data *vt8231_update_device(struct device *dev);
 172 static void vt8231_init_device(struct vt8231_data *data);
 173
 174 static inline int vt8231_read_value(struct vt8231_data *data, u8 reg)
 175 {
 176         return inb_p(data->addr + reg);
 177 }
 178
 179 static inline void vt8231_write_value(struct vt8231_data *data, u8 reg,
 180                                         u8 value)
 181 {
 182         outb_p(value, data->addr + reg);
 183 }
 184
 185 /* following are the sysfs callback functions */
 186 static ssize_t show_in(struct device *dev, struct device_attribute *attr,
 187                 char *buf)
 188 {
 189         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 190         int nr = sensor_attr->index;
 191         struct vt8231_data *data = vt8231_update_device(dev);
 192
 193         return sprintf(buf, "%d\n", ((data->in[nr] - 3) * 10000) / 958);
 194 }
 195
 196 static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
 197                 char *buf)
 198 {
 199         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 200         int nr = sensor_attr->index;
 201         struct vt8231_data *data = vt8231_update_device(dev);
 202
 203         return sprintf(buf, "%d\n", ((data->in_min[nr] - 3) * 10000) / 958);
 204 }
 205
 206 static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
 207                 char *buf)
 208 {
 209         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 210         int nr = sensor_attr->index;
 211         struct vt8231_data *data = vt8231_update_device(dev);
 212
 213         return sprintf(buf, "%d\n", (((data->in_max[nr] - 3) * 10000) / 958));
 214 }
 215
 216 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
 217                 const char *buf, size_t count)
 218 {
 219         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 220         int nr = sensor_attr->index;
 221         struct vt8231_data *data = dev_get_drvdata(dev);
 222         unsigned long val = simple_strtoul(buf, NULL, 10);
 223
 224         mutex_lock(&data->update_lock);
 225         data->in_min[nr] = SENSORS_LIMIT(((val * 958) / 10000) + 3, 0, 255);
 226         vt8231_write_value(data, regvoltmin[nr], data->in_min[nr]);
 227         mutex_unlock(&data->update_lock);
 228         return count;
 229 }
 230
 231 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
 232                 const char *buf, size_t count)
 233 {
 234         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 235         int nr = sensor_attr->index;
 236         struct vt8231_data *data = dev_get_drvdata(dev);
 237         unsigned long val = simple_strtoul(buf, NULL, 10);
 238
 239         mutex_lock(&data->update_lock);
 240         data->in_max[nr] = SENSORS_LIMIT(((val * 958) / 10000) + 3, 0, 255);
 241         vt8231_write_value(data, regvoltmax[nr], data->in_max[nr]);
 242         mutex_unlock(&data->update_lock);
 243         return count;
 244 }
 245
 246 /* Special case for input 5 as this has 3.3V scaling built into the chip */
 247 static ssize_t show_in5(struct device *dev, struct device_attribute *attr,
 248                 char *buf)
 249 {
 250         struct vt8231_data *data = vt8231_update_device(dev);
 251
 252         return sprintf(buf, "%d\n",
 253                 (((data->in[5] - 3) * 10000 * 54) / (958 * 34)));
 254 }
 255
 256 static ssize_t show_in5_min(struct device *dev, struct device_attribute *attr,
 257                 char *buf)
 258 {
 259         struct vt8231_data *data = vt8231_update_device(dev);
 260
 261         return sprintf(buf, "%d\n",
 262                 (((data->in_min[5] - 3) * 10000 * 54) / (958 * 34)));
 263 }
 264
 265 static ssize_t show_in5_max(struct device *dev, struct device_attribute *attr,
 266                 char *buf)
 267 {
 268         struct vt8231_data *data = vt8231_update_device(dev);
 269
 270         return sprintf(buf, "%d\n",
 271                 (((data->in_max[5] - 3) * 10000 * 54) / (958 * 34)));
 272 }
 273
 274 static ssize_t set_in5_min(struct device *dev, struct device_attribute *attr,
 275                 const char *buf, size_t count)
 276 {
 277         struct vt8231_data *data = dev_get_drvdata(dev);
 278         unsigned long val = simple_strtoul(buf, NULL, 10);
 279
 280         mutex_lock(&data->update_lock);
 281         data->in_min[5] = SENSORS_LIMIT(((val * 958 * 34) / (10000 * 54)) + 3,
 282                                         0, 255);
 283         vt8231_write_value(data, regvoltmin[5], data->in_min[5]);
 284         mutex_unlock(&data->update_lock);
 285         return count;
 286 }
 287
 288 static ssize_t set_in5_max(struct device *dev, struct device_attribute *attr,
 289                 const char *buf, size_t count)
 290 {
 291         struct vt8231_data *data = dev_get_drvdata(dev);
 292         unsigned long val = simple_strtoul(buf, NULL, 10);
 293
 294         mutex_lock(&data->update_lock);
 295         data->in_max[5] = SENSORS_LIMIT(((val * 958 * 34) / (10000 * 54)) + 3,
 296                                         0, 255);
 297         vt8231_write_value(data, regvoltmax[5], data->in_max[5]);
 298         mutex_unlock(&data->update_lock);
 299         return count;
 300 }
 301
 302 #define define_voltage_sysfs(offset)                            \
 303 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO,          \
 304                 show_in, NULL, offset);                         \
 305 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,  \
 306                 show_in_min, set_in_min, offset);               \
 307 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,  \
 308                 show_in_max, set_in_max, offset)
 309
 310 define_voltage_sysfs(0);
 311 define_voltage_sysfs(1);
 312 define_voltage_sysfs(2);
 313 define_voltage_sysfs(3);
 314 define_voltage_sysfs(4);
 315
 316 static DEVICE_ATTR(in5_input, S_IRUGO, show_in5, NULL);
 317 static DEVICE_ATTR(in5_min, S_IRUGO | S_IWUSR, show_in5_min, set_in5_min);
 318 static DEVICE_ATTR(in5_max, S_IRUGO | S_IWUSR, show_in5_max, set_in5_max);
 319
 320 /* Temperatures */
 321 static ssize_t show_temp0(struct device *dev, struct device_attribute *attr,
 322                 char *buf)
 323 {
 324         struct vt8231_data *data = vt8231_update_device(dev);
 325         return sprintf(buf, "%d\n", data->temp[0] * 250);
 326 }
 327
 328 static ssize_t show_temp0_max(struct device *dev, struct device_attribute *attr,
 329                 char *buf)
 330 {
 331         struct vt8231_data *data = vt8231_update_device(dev);
 332         return sprintf(buf, "%d\n", data->temp_max[0] * 1000);
 333 }
 334
 335 static ssize_t show_temp0_min(struct device *dev, struct device_attribute *attr,
 336                 char *buf)
 337 {
 338         struct vt8231_data *data = vt8231_update_device(dev);
 339         return sprintf(buf, "%d\n", data->temp_min[0] * 1000);
 340 }
 341
 342 static ssize_t set_temp0_max(struct device *dev, struct device_attribute *attr,
 343                 const char *buf, size_t count)
 344 {
 345         struct vt8231_data *data = dev_get_drvdata(dev);
 346         int val = simple_strtol(buf, NULL, 10);
 347
 348         mutex_lock(&data->update_lock);
 349         data->temp_max[0] = SENSORS_LIMIT((val + 500) / 1000, 0, 255);
 350         vt8231_write_value(data, regtempmax[0], data->temp_max[0]);
 351         mutex_unlock(&data->update_lock);
 352         return count;
 353 }
 354 static ssize_t set_temp0_min(struct device *dev, struct device_attribute *attr,
 355                 const char *buf, size_t count)
 356 {
 357         struct vt8231_data *data = dev_get_drvdata(dev);
 358         int val = simple_strtol(buf, NULL, 10);
 359
 360         mutex_lock(&data->update_lock);
 361         data->temp_min[0] = SENSORS_LIMIT((val + 500) / 1000, 0, 255);
 362         vt8231_write_value(data, regtempmin[0], data->temp_min[0]);
 363         mutex_unlock(&data->update_lock);
 364         return count;
 365 }
 366
 367 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
 368                 char *buf)
 369 {
 370         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 371         int nr = sensor_attr->index;
 372         struct vt8231_data *data = vt8231_update_device(dev);
 373         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
 374 }
 375
 376 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
 377                 char *buf)
 378 {
 379         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 380         int nr = sensor_attr->index;
 381         struct vt8231_data *data = vt8231_update_device(dev);
 382         return sprintf(buf, "%d\n", TEMP_MAXMIN_FROM_REG(data->temp_max[nr]));
 383 }
 384
 385 static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
 386                 char *buf)
 387 {
 388         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 389         int nr = sensor_attr->index;
 390         struct vt8231_data *data = vt8231_update_device(dev);
 391         return sprintf(buf, "%d\n", TEMP_MAXMIN_FROM_REG(data->temp_min[nr]));
 392 }
 393
 394 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
 395                 const char *buf, size_t count)
 396 {
 397         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 398         int nr = sensor_attr->index;
 399         struct vt8231_data *data = dev_get_drvdata(dev);
 400         int val = simple_strtol(buf, NULL, 10);
 401
 402         mutex_lock(&data->update_lock);
 403         data->temp_max[nr] = SENSORS_LIMIT(TEMP_MAXMIN_TO_REG(val), 0, 255);
 404         vt8231_write_value(data, regtempmax[nr], data->temp_max[nr]);
 405         mutex_unlock(&data->update_lock);
 406         return count;
 407 }
 408 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
 409                 const char *buf, size_t count)
 410 {
 411         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 412         int nr = sensor_attr->index;
 413         struct vt8231_data *data = dev_get_drvdata(dev);
 414         int val = simple_strtol(buf, NULL, 10);
 415
 416         mutex_lock(&data->update_lock);
 417         data->temp_min[nr] = SENSORS_LIMIT(TEMP_MAXMIN_TO_REG(val), 0, 255);
 418         vt8231_write_value(data, regtempmin[nr], data->temp_min[nr]);
 419         mutex_unlock(&data->update_lock);
 420         return count;
 421 }
 422
 423 /* Note that these map the Linux temperature sensor numbering (1-6) to the VIA
 424 ** temperature sensor numbering (0-5)
 425 */
 426 #define define_temperature_sysfs(offset)                                \
 427 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO,                \
 428                 show_temp, NULL, offset - 1);                           \
 429 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,        \
 430                 show_temp_max, set_temp_max, offset - 1);               \
 431 static SENSOR_DEVICE_ATTR(temp##offset##_max_hyst, S_IRUGO | S_IWUSR,   \
 432                 show_temp_min, set_temp_min, offset - 1)
 433
 434 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp0, NULL);
 435 static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, show_temp0_max, set_temp0_max);
 436 static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR, show_temp0_min, set_temp0_min);
 437
 438 define_temperature_sysfs(2);
 439 define_temperature_sysfs(3);
 440 define_temperature_sysfs(4);
 441 define_temperature_sysfs(5);
 442 define_temperature_sysfs(6);
 443
 444 /* Fans */
 445 static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
 446                 char *buf)
 447 {
 448         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 449         int nr = sensor_attr->index;
 450         struct vt8231_data *data = vt8231_update_device(dev);
 451         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
 452                                 DIV_FROM_REG(data->fan_div[nr])));
 453 }
 454
 455 static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,
 456                 char *buf)
 457 {
 458         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 459         int nr = sensor_attr->index;
 460         struct vt8231_data *data = vt8231_update_device(dev);
 461         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
 462                         DIV_FROM_REG(data->fan_div[nr])));
 463 }
 464
 465 static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
 466                 char *buf)
 467 {
 468         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 469         int nr = sensor_attr->index;
 470         struct vt8231_data *data = vt8231_update_device(dev);
 471         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
 472 }
 473
 474 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
 475                 const char *buf, size_t count)
 476 {
 477         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 478         int nr = sensor_attr->index;
 479         struct vt8231_data *data = dev_get_drvdata(dev);
 480         int val = simple_strtoul(buf, NULL, 10);
 481
 482         mutex_lock(&data->update_lock);
 483         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
 484         vt8231_write_value(data, VT8231_REG_FAN_MIN(nr), data->fan_min[nr]);
 485         mutex_unlock(&data->update_lock);
 486         return count;
 487 }
 488
 489 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
 490                 const char *buf, size_t count)
 491 {
 492         struct vt8231_data *data = dev_get_drvdata(dev);
 493         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 494         unsigned long val = simple_strtoul(buf, NULL, 10);
 495         int nr = sensor_attr->index;
 496         int old = vt8231_read_value(data, VT8231_REG_FANDIV);
 497         long min = FAN_FROM_REG(data->fan_min[nr],
 498                                  DIV_FROM_REG(data->fan_div[nr]));
 499
 500         mutex_lock(&data->update_lock);
 501         switch (val) {
 502         case 1: data->fan_div[nr] = 0; break;
 503         case 2: data->fan_div[nr] = 1; break;
 504         case 4: data->fan_div[nr] = 2; break;
 505         case 8: data->fan_div[nr] = 3; break;
 506         default:
 507                 dev_err(dev, "fan_div value %ld not supported."
 508                         "Choose one of 1, 2, 4 or 8!\n", val);
 509                 mutex_unlock(&data->update_lock);
 510                 return -EINVAL;
 511         }
 512
 513         /* Correct the fan minimum speed */
 514         data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
 515         vt8231_write_value(data, VT8231_REG_FAN_MIN(nr), data->fan_min[nr]);
 516
 517         old = (old & 0x0f) | (data->fan_div[1] << 6) | (data->fan_div[0] << 4);
 518         vt8231_write_value(data, VT8231_REG_FANDIV, old);
 519         mutex_unlock(&data->update_lock);
 520         return count;
 521 }
 522
 523
 524 #define define_fan_sysfs(offset)                                        \
 525 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO,                 \
 526                 show_fan, NULL, offset - 1);                            \
 527 static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR,         \
 528                 show_fan_div, set_fan_div, offset - 1);                 \
 529 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR,         \
 530                 show_fan_min, set_fan_min, offset - 1)
 531
 532 define_fan_sysfs(1);
 533 define_fan_sysfs(2);
 534
 535 /* Alarms */
 536 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
 537                            char *buf)
 538 {
 539         struct vt8231_data *data = vt8231_update_device(dev);
 540         return sprintf(buf, "%d\n", data->alarms);
 541 }
 542 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 543
 544 static ssize_t show_name(struct device *dev, struct device_attribute
 545                          *devattr, char *buf)
 546 {
 547         struct vt8231_data *data = dev_get_drvdata(dev);
 548         return sprintf(buf, "%s\n", data->name);
 549 }
 550 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 551
 552 static struct attribute *vt8231_attributes_temps[6][4] = {
 553         {
 554                 &dev_attr_temp1_input.attr,
 555                 &dev_attr_temp1_max_hyst.attr,
 556                 &dev_attr_temp1_max.attr,
 557                 NULL
 558         }, {
 559                 &sensor_dev_attr_temp2_input.dev_attr.attr,
 560                 &sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
 561                 &sensor_dev_attr_temp2_max.dev_attr.attr,
 562                 NULL
 563         }, {
 564                 &sensor_dev_attr_temp3_input.dev_attr.attr,
 565                 &sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
 566                 &sensor_dev_attr_temp3_max.dev_attr.attr,
 567                 NULL
 568         }, {
 569                 &sensor_dev_attr_temp4_input.dev_attr.attr,
 570                 &sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
 571                 &sensor_dev_attr_temp4_max.dev_attr.attr,
 572                 NULL
 573         }, {
 574                 &sensor_dev_attr_temp5_input.dev_attr.attr,
 575                 &sensor_dev_attr_temp5_max_hyst.dev_attr.attr,
 576                 &sensor_dev_attr_temp5_max.dev_attr.attr,
 577                 NULL
 578         }, {
 579                 &sensor_dev_attr_temp6_input.dev_attr.attr,
 580                 &sensor_dev_attr_temp6_max_hyst.dev_attr.attr,
 581                 &sensor_dev_attr_temp6_max.dev_attr.attr,
 582                 NULL
 583         }
 584 };
 585
 586 static const struct attribute_group vt8231_group_temps[6] = {
 587         { .attrs = vt8231_attributes_temps[0] },
 588         { .attrs = vt8231_attributes_temps[1] },
 589         { .attrs = vt8231_attributes_temps[2] },
 590         { .attrs = vt8231_attributes_temps[3] },
 591         { .attrs = vt8231_attributes_temps[4] },
 592         { .attrs = vt8231_attributes_temps[5] },
 593 };
 594
 595 static struct attribute *vt8231_attributes_volts[6][4] = {
 596         {
 597                 &sensor_dev_attr_in0_input.dev_attr.attr,
 598                 &sensor_dev_attr_in0_min.dev_attr.attr,
 599                 &sensor_dev_attr_in0_max.dev_attr.attr,
 600                 NULL
 601         }, {
 602                 &sensor_dev_attr_in1_input.dev_attr.attr,
 603                 &sensor_dev_attr_in1_min.dev_attr.attr,
 604                 &sensor_dev_attr_in1_max.dev_attr.attr,
 605                 NULL
 606         }, {
 607                 &sensor_dev_attr_in2_input.dev_attr.attr,
 608                 &sensor_dev_attr_in2_min.dev_attr.attr,
 609                 &sensor_dev_attr_in2_max.dev_attr.attr,
 610                 NULL
 611         }, {
 612                 &sensor_dev_attr_in3_input.dev_attr.attr,
 613                 &sensor_dev_attr_in3_min.dev_attr.attr,
 614                 &sensor_dev_attr_in3_max.dev_attr.attr,
 615                 NULL
 616         }, {
 617                 &sensor_dev_attr_in4_input.dev_attr.attr,
 618                 &sensor_dev_attr_in4_min.dev_attr.attr,
 619                 &sensor_dev_attr_in4_max.dev_attr.attr,
 620                 NULL
 621         }, {
 622                 &dev_attr_in5_input.attr,
 623                 &dev_attr_in5_min.attr,
 624                 &dev_attr_in5_max.attr,
 625                 NULL
 626         }
 627 };
 628
 629 static const struct attribute_group vt8231_group_volts[6] = {
 630         { .attrs = vt8231_attributes_volts[0] },
 631         { .attrs = vt8231_attributes_volts[1] },
 632         { .attrs = vt8231_attributes_volts[2] },
 633         { .attrs = vt8231_attributes_volts[3] },
 634         { .attrs = vt8231_attributes_volts[4] },
 635         { .attrs = vt8231_attributes_volts[5] },
 636 };
 637
 638 static struct attribute *vt8231_attributes[] = {
 639         &sensor_dev_attr_fan1_input.dev_attr.attr,
 640         &sensor_dev_attr_fan2_input.dev_attr.attr,
 641         &sensor_dev_attr_fan1_min.dev_attr.attr,
 642         &sensor_dev_attr_fan2_min.dev_attr.attr,
 643         &sensor_dev_attr_fan1_div.dev_attr.attr,
 644         &sensor_dev_attr_fan2_div.dev_attr.attr,
 645         &dev_attr_alarms.attr,
 646         &dev_attr_name.attr,
 647         NULL
 648 };
 649
 650 static const struct attribute_group vt8231_group = {
 651         .attrs = vt8231_attributes,
 652 };
 653
 654 static struct platform_driver vt8231_driver = {
 655         .driver = {
 656                 .owner  = THIS_MODULE,
 657                 .name   = "vt8231",
 658         },
 659         .probe  = vt8231_probe,
 660         .remove = __devexit_p(vt8231_remove),
 661 };
 662
 663 static struct pci_device_id vt8231_pci_ids[] = {
 664         { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8231_4) },
 665         { 0, }
 666 };
 667
 668 MODULE_DEVICE_TABLE(pci, vt8231_pci_ids);
 669
 670 static int __devinit vt8231_pci_probe(struct pci_dev *dev,
 671                                       const struct pci_device_id *id);
 672
 673 static struct pci_driver vt8231_pci_driver = {
 674         .name           = "vt8231",
 675         .id_table       = vt8231_pci_ids,
 676         .probe          = vt8231_pci_probe,
 677 };
 678
 679 int vt8231_probe(struct platform_device *pdev)
 680 {
 681         struct resource *res;
 682         struct vt8231_data *data;
 683         int err = 0, i;
 684
 685         /* Reserve the ISA region */
 686         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 687         if (!request_region(res->start, VT8231_EXTENT,
 688                             vt8231_driver.driver.name)) {
 689                 dev_err(&pdev->dev, "Region 0x%lx-0x%lx already in use!\n",
 690                         (unsigned long)res->start, (unsigned long)res->end);
 691                 return -ENODEV;
 692         }
 693
 694         if (!(data = kzalloc(sizeof(struct vt8231_data), GFP_KERNEL))) {
 695                 err = -ENOMEM;
 696                 goto exit_release;
 697         }
 698
 699         platform_set_drvdata(pdev, data);
 700         data->addr = res->start;
 701         data->name = "vt8231";
 702
 703         mutex_init(&data->update_lock);
 704         vt8231_init_device(data);
 705
 706         /* Register sysfs hooks */
 707         if ((err = sysfs_create_group(&pdev->dev.kobj, &vt8231_group)))
 708                 goto exit_free;
 709
 710         /* Must update device information to find out the config field */
 711         data->uch_config = vt8231_read_value(data, VT8231_REG_UCH_CONFIG);
 712
 713         for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++) {
 714                 if (ISTEMP(i, data->uch_config)) {
 715                         if ((err = sysfs_create_group(&pdev->dev.kobj,
 716                                         &vt8231_group_temps[i])))
 717                                 goto exit_remove_files;
 718                 }
 719         }
 720
 721         for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++) {
 722                 if (ISVOLT(i, data->uch_config)) {
 723                         if ((err = sysfs_create_group(&pdev->dev.kobj,
 724                                         &vt8231_group_volts[i])))
 725                                 goto exit_remove_files;
 726                 }
 727         }
 728
 729         data->class_dev = hwmon_device_register(&pdev->dev);
 730         if (IS_ERR(data->class_dev)) {
 731                 err = PTR_ERR(data->class_dev);
 732                 goto exit_remove_files;
 733         }
 734         return 0;
 735
 736 exit_remove_files:
 737         for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++)
 738                 sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_volts[i]);
 739
 740         for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++)
 741                 sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_temps[i]);
 742
 743         sysfs_remove_group(&pdev->dev.kobj, &vt8231_group);
 744
 745 exit_free:
 746         platform_set_drvdata(pdev, NULL);
 747         kfree(data);
 748
 749 exit_release:
 750         release_region(res->start, VT8231_EXTENT);
 751         return err;
 752 }
 753
 754 static int __devexit vt8231_remove(struct platform_device *pdev)
 755 {
 756         struct vt8231_data *data = platform_get_drvdata(pdev);
 757         int i;
 758
 759         hwmon_device_unregister(data->class_dev);
 760
 761         for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++)
 762                 sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_volts[i]);
 763
 764         for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++)
 765                 sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_temps[i]);
 766
 767         sysfs_remove_group(&pdev->dev.kobj, &vt8231_group);
 768
 769         release_region(data->addr, VT8231_EXTENT);
 770         platform_set_drvdata(pdev, NULL);
 771         kfree(data);
 772         return 0;
 773 }
 774
 775 static void vt8231_init_device(struct vt8231_data *data)
 776 {
 777         vt8231_write_value(data, VT8231_REG_TEMP1_CONFIG, 0);
 778         vt8231_write_value(data, VT8231_REG_TEMP2_CONFIG, 0);
 779 }
 780
 781 static struct vt8231_data *vt8231_update_device(struct device *dev)
 782 {
 783         struct vt8231_data *data = dev_get_drvdata(dev);
 784         int i;
 785         u16 low;
 786
 787         mutex_lock(&data->update_lock);
 788
 789         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 790             || !data->valid) {
 791                 for (i = 0; i < 6; i++) {
 792                         if (ISVOLT(i, data->uch_config)) {
 793                                 data->in[i] = vt8231_read_value(data,
 794                                                 regvolt[i]);
 795                                 data->in_min[i] = vt8231_read_value(data,
 796                                                 regvoltmin[i]);
 797                                 data->in_max[i] = vt8231_read_value(data,
 798                                                 regvoltmax[i]);
 799                         }
 800                 }
 801                 for (i = 0; i < 2; i++) {
 802                         data->fan[i] = vt8231_read_value(data,
 803                                                 VT8231_REG_FAN(i));
 804                         data->fan_min[i] = vt8231_read_value(data,
 805                                                 VT8231_REG_FAN_MIN(i));
 806                 }
 807
 808                 low = vt8231_read_value(data, VT8231_REG_TEMP_LOW01);
 809                 low = (low >> 6) | ((low & 0x30) >> 2)
 810                     | (vt8231_read_value(data, VT8231_REG_TEMP_LOW25) << 4);
 811                 for (i = 0; i < 6; i++) {
 812                         if (ISTEMP(i, data->uch_config)) {
 813                                 data->temp[i] = (vt8231_read_value(data,
 814                                                        regtemp[i]) << 2)
 815                                                 | ((low >> (2 * i)) & 0x03);
 816                                 data->temp_max[i] = vt8231_read_value(data,
 817                                                       regtempmax[i]);
 818                                 data->temp_min[i] = vt8231_read_value(data,
 819                                                       regtempmin[i]);
 820                         }
 821                 }
 822
 823                 i = vt8231_read_value(data, VT8231_REG_FANDIV);
 824                 data->fan_div[0] = (i >> 4) & 0x03;
 825                 data->fan_div[1] = i >> 6;
 826                 data->alarms = vt8231_read_value(data, VT8231_REG_ALARM1) |
 827                         (vt8231_read_value(data, VT8231_REG_ALARM2) << 8);
 828
 829                 /* Set alarm flags correctly */
 830                 if (!data->fan[0] && data->fan_min[0]) {
 831                         data->alarms |= 0x40;
 832                 } else if (data->fan[0] && !data->fan_min[0]) {
 833                         data->alarms &= ~0x40;
 834                 }
 835
 836                 if (!data->fan[1] && data->fan_min[1]) {
 837                         data->alarms |= 0x80;
 838                 } else if (data->fan[1] && !data->fan_min[1]) {
 839                         data->alarms &= ~0x80;
 840                 }
 841
 842                 data->last_updated = jiffies;
 843                 data->valid = 1;
 844         }
 845
 846         mutex_unlock(&data->update_lock);
 847
 848         return data;
 849 }
 850
 851 static int __devinit vt8231_device_add(unsigned short address)
 852 {
 853         struct resource res = {
 854                 .start  = address,
 855                 .end    = address + VT8231_EXTENT - 1,
 856                 .name   = "vt8231",
 857                 .flags  = IORESOURCE_IO,
 858         };
 859         int err;
 860
 861         pdev = platform_device_alloc("vt8231", address);
 862         if (!pdev) {
 863                 err = -ENOMEM;
 864                 printk(KERN_ERR "vt8231: Device allocation failed\n");
 865                 goto exit;
 866         }
 867
 868         err = platform_device_add_resources(pdev, &res, 1);
 869         if (err) {
 870                 printk(KERN_ERR "vt8231: Device resource addition failed "
 871                        "(%d)\n", err);
 872                 goto exit_device_put;
 873         }
 874
 875         err = platform_device_add(pdev);
 876         if (err) {
 877                 printk(KERN_ERR "vt8231: Device addition failed (%d)\n",
 878                        err);
 879                 goto exit_device_put;
 880         }
 881
 882         return 0;
 883
 884 exit_device_put:
 885         platform_device_put(pdev);
 886 exit:
 887         return err;
 888 }
 889
 890 static int __devinit vt8231_pci_probe(struct pci_dev *dev,
 891                                 const struct pci_device_id *id)
 892 {
 893         u16 address, val;
 894         if (force_addr) {
 895                 address = force_addr & 0xff00;
 896                 dev_warn(&dev->dev, "Forcing ISA address 0x%x\n",
 897                          address);
 898
 899                 if (PCIBIOS_SUCCESSFUL !=
 900                     pci_write_config_word(dev, VT8231_BASE_REG, address | 1))
 901                         return -ENODEV;
 902         }
 903
 904         if (PCIBIOS_SUCCESSFUL != pci_read_config_word(dev, VT8231_BASE_REG,
 905                                                         &val))
 906                 return -ENODEV;
 907
 908         address = val & ~(VT8231_EXTENT - 1);
 909         if (address == 0) {
 910                 dev_err(&dev->dev, "base address not set -\
 911                                  upgrade BIOS or use force_addr=0xaddr\n");
 912                 return -ENODEV;
 913         }
 914
 915         if (PCIBIOS_SUCCESSFUL != pci_read_config_word(dev, VT8231_ENABLE_REG,
 916                                                         &val))
 917                 return -ENODEV;
 918
 919         if (!(val & 0x0001)) {
 920                 dev_warn(&dev->dev, "enabling sensors\n");
 921                 if (PCIBIOS_SUCCESSFUL !=
 922                         pci_write_config_word(dev, VT8231_ENABLE_REG,
 923                                                         val | 0x0001))
 924                         return -ENODEV;
 925         }
 926
 927         if (platform_driver_register(&vt8231_driver))
 928                 goto exit;
 929
 930         /* Sets global pdev as a side effect */
 931         if (vt8231_device_add(address))
 932                 goto exit_unregister;
 933
 934         /* Always return failure here.  This is to allow other drivers to bind
 935          * to this pci device.  We don't really want to have control over the
 936          * pci device, we only wanted to read as few register values from it.
 937          */
 938
 939         /* We do, however, mark ourselves as using the PCI device to stop it
 940            getting unloaded. */
 941         s_bridge = pci_dev_get(dev);
 942         return -ENODEV;
 943
 944 exit_unregister:
 945         platform_driver_unregister(&vt8231_driver);
 946 exit:
 947         return -ENODEV;
 948 }
 949
 950 static int __init sm_vt8231_init(void)
 951 {
 952         return pci_register_driver(&vt8231_pci_driver);
 953 }
 954
 955 static void __exit sm_vt8231_exit(void)
 956 {
 957         pci_unregister_driver(&vt8231_pci_driver);
 958         if (s_bridge != NULL) {
 959                 platform_device_unregister(pdev);
 960                 platform_driver_unregister(&vt8231_driver);
 961                 pci_dev_put(s_bridge);
 962                 s_bridge = NULL;
 963         }
 964 }
 965
 966 MODULE_AUTHOR("Roger Lucas <roger@planbit.co.uk>");
 967 MODULE_DESCRIPTION("VT8231 sensors");
 968 MODULE_LICENSE("GPL");
 969
 970 module_init(sm_vt8231_init);
 971 module_exit(sm_vt8231_exit);