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/i2c.h>
  33 #include <linux/i2c-isa.h>
  34 #include <linux/hwmon.h>
  35 #include <linux/hwmon-sysfs.h>
  36 #include <linux/hwmon-vid.h>
  37 #include <linux/err.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 /* Device address
  45    Note that we can't determine the ISA address until we have initialized
  46    our module */
  47 static unsigned short isa_address;
  48
  49 #define VT8231_EXTENT 0x80
  50 #define VT8231_BASE_REG 0x70
  51 #define VT8231_ENABLE_REG 0x74
  52
  53 /* The VT8231 registers
  54
  55    The reset value for the input channel configuration is used (Reg 0x4A=0x07)
  56    which sets the selected inputs marked with '*' below if multiple options are
  57    possible:
  58
  59                     Voltage Mode          Temperature Mode
  60         Sensor        Linux Id        Linux Id        VIA Id
  61         --------      --------        --------        ------
  62         CPU Diode       N/A             temp1           0
  63         UIC1            in0             temp2 *         1
  64         UIC2            in1 *           temp3           2
  65         UIC3            in2 *           temp4           3
  66         UIC4            in3 *           temp5           4
  67         UIC5            in4 *           temp6           5
  68         3.3V            in5             N/A
  69
  70    Note that the BIOS may set the configuration register to a different value
  71    to match the motherboard configuration.
  72 */
  73
  74 /* fans numbered 0-1 */
  75 #define VT8231_REG_FAN_MIN(nr)  (0x3b + (nr))
  76 #define VT8231_REG_FAN(nr)      (0x29 + (nr))
  77
  78 /* Voltage inputs numbered 0-5 */
  79
  80 static const u8 regvolt[]    = { 0x21, 0x22, 0x23, 0x24, 0x25, 0x26 };
  81 static const u8 regvoltmax[] = { 0x3d, 0x2b, 0x2d, 0x2f, 0x31, 0x33 };
  82 static const u8 regvoltmin[] = { 0x3e, 0x2c, 0x2e, 0x30, 0x32, 0x34 };
  83
  84 /* Temperatures are numbered 1-6 according to the Linux kernel specification.
  85 **
  86 ** In the VIA datasheet, however, the temperatures are numbered from zero.
  87 ** Since it is important that this driver can easily be compared to the VIA
  88 ** datasheet, we will use the VIA numbering within this driver and map the
  89 ** kernel sysfs device name to the VIA number in the sysfs callback.
  90 */
  91
  92 #define VT8231_REG_TEMP_LOW01   0x49
  93 #define VT8231_REG_TEMP_LOW25   0x4d
  94
  95 static const u8 regtemp[]    = { 0x1f, 0x21, 0x22, 0x23, 0x24, 0x25 };
  96 static const u8 regtempmax[] = { 0x39, 0x3d, 0x2b, 0x2d, 0x2f, 0x31 };
  97 static const u8 regtempmin[] = { 0x3a, 0x3e, 0x2c, 0x2e, 0x30, 0x32 };
  98
  99 #define TEMP_FROM_REG(reg)              (((253 * 4 - (reg)) * 550 + 105) / 210)
 100 #define TEMP_MAXMIN_FROM_REG(reg)       (((253 - (reg)) * 2200 + 105) / 210)
 101 #define TEMP_MAXMIN_TO_REG(val)         (253 - ((val) * 210 + 1100) / 2200)
 102
 103 #define VT8231_REG_CONFIG 0x40
 104 #define VT8231_REG_ALARM1 0x41
 105 #define VT8231_REG_ALARM2 0x42
 106 #define VT8231_REG_FANDIV 0x47
 107 #define VT8231_REG_UCH_CONFIG 0x4a
 108 #define VT8231_REG_TEMP1_CONFIG 0x4b
 109 #define VT8231_REG_TEMP2_CONFIG 0x4c
 110
 111 /* temps 0-5 as numbered in VIA datasheet - see later for mapping to Linux
 112 ** numbering
 113 */
 114 #define ISTEMP(i, ch_config) ((i) == 0 ? 1 : \
 115                               ((ch_config) >> ((i)+1)) & 0x01)
 116 /* voltages 0-5 */
 117 #define ISVOLT(i, ch_config) ((i) == 5 ? 1 : \
 118                               !(((ch_config) >> ((i)+2)) & 0x01))
 119
 120 #define DIV_FROM_REG(val) (1 << (val))
 121
 122 /* NB  The values returned here are NOT temperatures.  The calibration curves
 123 **     for the thermistor curves are board-specific and must go in the
 124 **     sensors.conf file.  Temperature sensors are actually ten bits, but the
 125 **     VIA datasheet only considers the 8 MSBs obtained from the regtemp[]
 126 **     register.  The temperature value returned should have a magnitude of 3,
 127 **     so we use the VIA scaling as the "true" scaling and use the remaining 2
 128 **     LSBs as fractional precision.
 129 **
 130 **     All the on-chip hardware temperature comparisons for the alarms are only
 131 **     8-bits wide, and compare against the 8 MSBs of the temperature.  The bits
 132 **     in the registers VT8231_REG_TEMP_LOW01 and VT8231_REG_TEMP_LOW25 are
 133 **     ignored.
 134 */
 135
 136 /******** FAN RPM CONVERSIONS ********
 137 ** This chip saturates back at 0, not at 255 like many the other chips.
 138 ** So, 0 means 0 RPM
 139 */
 140 static inline u8 FAN_TO_REG(long rpm, int div)
 141 {
 142         if (rpm == 0)
 143                 return 0;
 144         return SENSORS_LIMIT(1310720 / (rpm * div), 1, 255);
 145 }
 146
 147 #define FAN_FROM_REG(val, div) ((val) == 0 ? 0 : 1310720 / ((val) * (div)))
 148
 149 struct vt8231_data {
 150         struct i2c_client client;
 151         struct semaphore update_lock;
 152         struct class_device *class_dev;
 153         char valid;             /* !=0 if following fields are valid */
 154         unsigned long last_updated;     /* In jiffies */
 155
 156         u8 in[6];               /* Register value */
 157         u8 in_max[6];           /* Register value */
 158         u8 in_min[6];           /* Register value */
 159         u16 temp[6];            /* Register value 10 bit, right aligned */
 160         u8 temp_max[6];         /* Register value */
 161         u8 temp_min[6];         /* Register value */
 162         u8 fan[2];              /* Register value */
 163         u8 fan_min[2];          /* Register value */
 164         u8 fan_div[2];          /* Register encoding, shifted right */
 165         u16 alarms;             /* Register encoding */
 166         u8 uch_config;
 167 };
 168
 169 static struct pci_dev *s_bridge;
 170 static int vt8231_detect(struct i2c_adapter *adapter);
 171 static int vt8231_detach_client(struct i2c_client *client);
 172 static struct vt8231_data *vt8231_update_device(struct device *dev);
 173 static void vt8231_init_client(struct i2c_client *client);
 174
 175 static inline int vt8231_read_value(struct i2c_client *client, u8 reg)
 176 {
 177         return inb_p(client->addr + reg);
 178 }
 179
 180 static inline void vt8231_write_value(struct i2c_client *client, u8 reg,
 181                                         u8 value)
 182 {
 183         outb_p(value, client->addr + reg);
 184 }
 185
 186 /* following are the sysfs callback functions */
 187 static ssize_t show_in(struct device *dev, struct device_attribute *attr,
 188                 char *buf)
 189 {
 190         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 191         int nr = sensor_attr->index;
 192         struct vt8231_data *data = vt8231_update_device(dev);
 193
 194         return sprintf(buf, "%d\n", ((data->in[nr] - 3) * 10000) / 958);
 195 }
 196
 197 static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
 198                 char *buf)
 199 {
 200         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 201         int nr = sensor_attr->index;
 202         struct vt8231_data *data = vt8231_update_device(dev);
 203
 204         return sprintf(buf, "%d\n", ((data->in_min[nr] - 3) * 10000) / 958);
 205 }
 206
 207 static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
 208                 char *buf)
 209 {
 210         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 211         int nr = sensor_attr->index;
 212         struct vt8231_data *data = vt8231_update_device(dev);
 213
 214         return sprintf(buf, "%d\n", (((data->in_max[nr] - 3) * 10000) / 958));
 215 }
 216
 217 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
 218                 const char *buf, size_t count)
 219 {
 220         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 221         int nr = sensor_attr->index;
 222         struct i2c_client *client = to_i2c_client(dev);
 223         struct vt8231_data *data = i2c_get_clientdata(client);
 224         unsigned long val = simple_strtoul(buf, NULL, 10);
 225
 226         down(&data->update_lock);
 227         data->in_min[nr] = SENSORS_LIMIT(((val * 958) / 10000) + 3, 0, 255);
 228         vt8231_write_value(client, regvoltmin[nr], data->in_min[nr]);
 229         up(&data->update_lock);
 230         return count;
 231 }
 232
 233 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
 234                 const char *buf, size_t count)
 235 {
 236         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 237         int nr = sensor_attr->index;
 238         struct i2c_client *client = to_i2c_client(dev);
 239         struct vt8231_data *data = i2c_get_clientdata(client);
 240         unsigned long val = simple_strtoul(buf, NULL, 10);
 241
 242         down(&data->update_lock);
 243         data->in_max[nr] = SENSORS_LIMIT(((val * 958) / 10000) + 3, 0, 255);
 244         vt8231_write_value(client, regvoltmax[nr], data->in_max[nr]);
 245         up(&data->update_lock);
 246         return count;
 247 }
 248
 249 /* Special case for input 5 as this has 3.3V scaling built into the chip */
 250 static ssize_t show_in5(struct device *dev, struct device_attribute *attr,
 251                 char *buf)
 252 {
 253         struct vt8231_data *data = vt8231_update_device(dev);
 254
 255         return sprintf(buf, "%d\n",
 256                 (((data->in[5] - 3) * 10000 * 54) / (958 * 34)));
 257 }
 258
 259 static ssize_t show_in5_min(struct device *dev, struct device_attribute *attr,
 260                 char *buf)
 261 {
 262         struct vt8231_data *data = vt8231_update_device(dev);
 263
 264         return sprintf(buf, "%d\n",
 265                 (((data->in_min[5] - 3) * 10000 * 54) / (958 * 34)));
 266 }
 267
 268 static ssize_t show_in5_max(struct device *dev, struct device_attribute *attr,
 269                 char *buf)
 270 {
 271         struct vt8231_data *data = vt8231_update_device(dev);
 272
 273         return sprintf(buf, "%d\n",
 274                 (((data->in_max[5] - 3) * 10000 * 54) / (958 * 34)));
 275 }
 276
 277 static ssize_t set_in5_min(struct device *dev, struct device_attribute *attr,
 278                 const char *buf, size_t count)
 279 {
 280         struct i2c_client *client = to_i2c_client(dev);
 281         struct vt8231_data *data = i2c_get_clientdata(client);
 282         unsigned long val = simple_strtoul(buf, NULL, 10);
 283
 284         down(&data->update_lock);
 285         data->in_min[5] = SENSORS_LIMIT(((val * 958 * 34) / (10000 * 54)) + 3,
 286                                         0, 255);
 287         vt8231_write_value(client, regvoltmin[5], data->in_min[5]);
 288         up(&data->update_lock);
 289         return count;
 290 }
 291
 292 static ssize_t set_in5_max(struct device *dev, struct device_attribute *attr,
 293                 const char *buf, size_t count)
 294 {
 295         struct i2c_client *client = to_i2c_client(dev);
 296         struct vt8231_data *data = i2c_get_clientdata(client);
 297         unsigned long val = simple_strtoul(buf, NULL, 10);
 298
 299         down(&data->update_lock);
 300         data->in_max[5] = SENSORS_LIMIT(((val * 958 * 34) / (10000 * 54)) + 3,
 301                                         0, 255);
 302         vt8231_write_value(client, regvoltmax[5], data->in_max[5]);
 303         up(&data->update_lock);
 304         return count;
 305 }
 306
 307 #define define_voltage_sysfs(offset)                            \
 308 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO,          \
 309                 show_in, NULL, offset);                         \
 310 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,  \
 311                 show_in_min, set_in_min, offset);               \
 312 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,  \
 313                 show_in_max, set_in_max, offset)
 314
 315 define_voltage_sysfs(0);
 316 define_voltage_sysfs(1);
 317 define_voltage_sysfs(2);
 318 define_voltage_sysfs(3);
 319 define_voltage_sysfs(4);
 320
 321 static DEVICE_ATTR(in5_input, S_IRUGO, show_in5, NULL);
 322 static DEVICE_ATTR(in5_min, S_IRUGO | S_IWUSR, show_in5_min, set_in5_min);
 323 static DEVICE_ATTR(in5_max, S_IRUGO | S_IWUSR, show_in5_max, set_in5_max);
 324
 325 /* Temperatures */
 326 static ssize_t show_temp0(struct device *dev, struct device_attribute *attr,
 327                 char *buf)
 328 {
 329         struct vt8231_data *data = vt8231_update_device(dev);
 330         return sprintf(buf, "%d\n", data->temp[0] * 250);
 331 }
 332
 333 static ssize_t show_temp0_max(struct device *dev, struct device_attribute *attr,
 334                 char *buf)
 335 {
 336         struct vt8231_data *data = vt8231_update_device(dev);
 337         return sprintf(buf, "%d\n", data->temp_max[0] * 1000);
 338 }
 339
 340 static ssize_t show_temp0_min(struct device *dev, struct device_attribute *attr,
 341                 char *buf)
 342 {
 343         struct vt8231_data *data = vt8231_update_device(dev);
 344         return sprintf(buf, "%d\n", data->temp_min[0] * 1000);
 345 }
 346
 347 static ssize_t set_temp0_max(struct device *dev, struct device_attribute *attr,
 348                 const char *buf, size_t count)
 349 {
 350         struct i2c_client *client = to_i2c_client(dev);
 351         struct vt8231_data *data = i2c_get_clientdata(client);
 352         int val = simple_strtol(buf, NULL, 10);
 353
 354         down(&data->update_lock);
 355         data->temp_max[0] = SENSORS_LIMIT((val + 500) / 1000, 0, 255);
 356         vt8231_write_value(client, regtempmax[0], data->temp_max[0]);
 357         up(&data->update_lock);
 358         return count;
 359 }
 360 static ssize_t set_temp0_min(struct device *dev, struct device_attribute *attr,
 361                 const char *buf, size_t count)
 362 {
 363         struct i2c_client *client = to_i2c_client(dev);
 364         struct vt8231_data *data = i2c_get_clientdata(client);
 365         int val = simple_strtol(buf, NULL, 10);
 366
 367         down(&data->update_lock);
 368         data->temp_min[0] = SENSORS_LIMIT((val + 500) / 1000, 0, 255);
 369         vt8231_write_value(client, regtempmin[0], data->temp_min[0]);
 370         up(&data->update_lock);
 371         return count;
 372 }
 373
 374 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
 375                 char *buf)
 376 {
 377         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 378         int nr = sensor_attr->index;
 379         struct vt8231_data *data = vt8231_update_device(dev);
 380         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
 381 }
 382
 383 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
 384                 char *buf)
 385 {
 386         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 387         int nr = sensor_attr->index;
 388         struct vt8231_data *data = vt8231_update_device(dev);
 389         return sprintf(buf, "%d\n", TEMP_MAXMIN_FROM_REG(data->temp_max[nr]));
 390 }
 391
 392 static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
 393                 char *buf)
 394 {
 395         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 396         int nr = sensor_attr->index;
 397         struct vt8231_data *data = vt8231_update_device(dev);
 398         return sprintf(buf, "%d\n", TEMP_MAXMIN_FROM_REG(data->temp_min[nr]));
 399 }
 400
 401 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
 402                 const char *buf, size_t count)
 403 {
 404         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 405         int nr = sensor_attr->index;
 406         struct i2c_client *client = to_i2c_client(dev);
 407         struct vt8231_data *data = i2c_get_clientdata(client);
 408         int val = simple_strtol(buf, NULL, 10);
 409
 410         down(&data->update_lock);
 411         data->temp_max[nr] = SENSORS_LIMIT(TEMP_MAXMIN_TO_REG(val), 0, 255);
 412         vt8231_write_value(client, regtempmax[nr], data->temp_max[nr]);
 413         up(&data->update_lock);
 414         return count;
 415 }
 416 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
 417                 const char *buf, size_t count)
 418 {
 419         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 420         int nr = sensor_attr->index;
 421         struct i2c_client *client = to_i2c_client(dev);
 422         struct vt8231_data *data = i2c_get_clientdata(client);
 423         int val = simple_strtol(buf, NULL, 10);
 424
 425         down(&data->update_lock);
 426         data->temp_min[nr] = SENSORS_LIMIT(TEMP_MAXMIN_TO_REG(val), 0, 255);
 427         vt8231_write_value(client, regtempmin[nr], data->temp_min[nr]);
 428         up(&data->update_lock);
 429         return count;
 430 }
 431
 432 /* Note that these map the Linux temperature sensor numbering (1-6) to the VIA
 433 ** temperature sensor numbering (0-5)
 434 */
 435 #define define_temperature_sysfs(offset)                                \
 436 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO,                \
 437                 show_temp, NULL, offset - 1);                           \
 438 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,        \
 439                 show_temp_max, set_temp_max, offset - 1);               \
 440 static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR,        \
 441                 show_temp_min, set_temp_min, offset - 1)
 442
 443 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp0, NULL);
 444 static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, show_temp0_max, set_temp0_max);
 445 static DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, show_temp0_min, set_temp0_min);
 446
 447 define_temperature_sysfs(2);
 448 define_temperature_sysfs(3);
 449 define_temperature_sysfs(4);
 450 define_temperature_sysfs(5);
 451 define_temperature_sysfs(6);
 452
 453 #define CFG_INFO_TEMP(id)       { &sensor_dev_attr_temp##id##_input.dev_attr, \
 454                                 &sensor_dev_attr_temp##id##_min.dev_attr, \
 455                                 &sensor_dev_attr_temp##id##_max.dev_attr }
 456 #define CFG_INFO_VOLT(id)       { &sensor_dev_attr_in##id##_input.dev_attr, \
 457                                 &sensor_dev_attr_in##id##_min.dev_attr, \
 458                                 &sensor_dev_attr_in##id##_max.dev_attr }
 459
 460 struct str_device_attr_table {
 461         struct device_attribute *input;
 462         struct device_attribute *min;
 463         struct device_attribute *max;
 464 };
 465
 466 static struct str_device_attr_table cfg_info_temp[] = {
 467         { &dev_attr_temp1_input, &dev_attr_temp1_min, &dev_attr_temp1_max },
 468         CFG_INFO_TEMP(2),
 469         CFG_INFO_TEMP(3),
 470         CFG_INFO_TEMP(4),
 471         CFG_INFO_TEMP(5),
 472         CFG_INFO_TEMP(6)
 473 };
 474
 475 static struct str_device_attr_table cfg_info_volt[] = {
 476         CFG_INFO_VOLT(0),
 477         CFG_INFO_VOLT(1),
 478         CFG_INFO_VOLT(2),
 479         CFG_INFO_VOLT(3),
 480         CFG_INFO_VOLT(4),
 481         { &dev_attr_in5_input, &dev_attr_in5_min, &dev_attr_in5_max }
 482 };
 483
 484 /* Fans */
 485 static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
 486                 char *buf)
 487 {
 488         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 489         int nr = sensor_attr->index;
 490         struct vt8231_data *data = vt8231_update_device(dev);
 491         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
 492                                 DIV_FROM_REG(data->fan_div[nr])));
 493 }
 494
 495 static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,
 496                 char *buf)
 497 {
 498         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 499         int nr = sensor_attr->index;
 500         struct vt8231_data *data = vt8231_update_device(dev);
 501         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
 502                         DIV_FROM_REG(data->fan_div[nr])));
 503 }
 504
 505 static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
 506                 char *buf)
 507 {
 508         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 509         int nr = sensor_attr->index;
 510         struct vt8231_data *data = vt8231_update_device(dev);
 511         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
 512 }
 513
 514 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
 515                 const char *buf, size_t count)
 516 {
 517         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 518         int nr = sensor_attr->index;
 519         struct i2c_client *client = to_i2c_client(dev);
 520         struct vt8231_data *data = i2c_get_clientdata(client);
 521         int val = simple_strtoul(buf, NULL, 10);
 522
 523         down(&data->update_lock);
 524         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
 525         vt8231_write_value(client, VT8231_REG_FAN_MIN(nr), data->fan_min[nr]);
 526         up(&data->update_lock);
 527         return count;
 528 }
 529
 530 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
 531                 const char *buf, size_t count)
 532 {
 533         struct i2c_client *client = to_i2c_client(dev);
 534         struct vt8231_data *data = i2c_get_clientdata(client);
 535         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 536         unsigned long val = simple_strtoul(buf, NULL, 10);
 537         int nr = sensor_attr->index;
 538         int old = vt8231_read_value(client, VT8231_REG_FANDIV);
 539         long min = FAN_FROM_REG(data->fan_min[nr],
 540                                  DIV_FROM_REG(data->fan_div[nr]));
 541
 542         down(&data->update_lock);
 543         switch (val) {
 544         case 1: data->fan_div[nr] = 0; break;
 545         case 2: data->fan_div[nr] = 1; break;
 546         case 4: data->fan_div[nr] = 2; break;
 547         case 8: data->fan_div[nr] = 3; break;
 548         default:
 549                 dev_err(&client->dev, "fan_div value %ld not supported."
 550                         "Choose one of 1, 2, 4 or 8!\n", val);
 551                 up(&data->update_lock);
 552                 return -EINVAL;
 553         }
 554
 555         /* Correct the fan minimum speed */
 556         data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
 557         vt8231_write_value(client, VT8231_REG_FAN_MIN(nr), data->fan_min[nr]);
 558
 559         old = (old & 0x0f) | (data->fan_div[1] << 6) | (data->fan_div[0] << 4);
 560         vt8231_write_value(client, VT8231_REG_FANDIV, old);
 561         up(&data->update_lock);
 562         return count;
 563 }
 564
 565
 566 #define define_fan_sysfs(offset)                                        \
 567 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO,                 \
 568                 show_fan, NULL, offset - 1);                            \
 569 static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR,         \
 570                 show_fan_div, set_fan_div, offset - 1);                 \
 571 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR,         \
 572                 show_fan_min, set_fan_min, offset - 1)
 573
 574 define_fan_sysfs(1);
 575 define_fan_sysfs(2);
 576
 577 /* Alarms */
 578 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
 579                            char *buf)
 580 {
 581         struct vt8231_data *data = vt8231_update_device(dev);
 582         return sprintf(buf, "%d\n", data->alarms);
 583 }
 584
 585 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 586
 587 static struct i2c_driver vt8231_driver = {
 588         .driver = {
 589                 .name   = "vt8231",
 590         },
 591         .attach_adapter = vt8231_detect,
 592         .detach_client  = vt8231_detach_client,
 593 };
 594
 595 static struct pci_device_id vt8231_pci_ids[] = {
 596         { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8231_4) },
 597         { 0, }
 598 };
 599
 600 MODULE_DEVICE_TABLE(pci, vt8231_pci_ids);
 601
 602 static int __devinit vt8231_pci_probe(struct pci_dev *dev,
 603                                       const struct pci_device_id *id);
 604
 605 static struct pci_driver vt8231_pci_driver = {
 606         .name           = "vt8231",
 607         .id_table       = vt8231_pci_ids,
 608         .probe          = vt8231_pci_probe,
 609 };
 610
 611 int vt8231_detect(struct i2c_adapter *adapter)
 612 {
 613         struct i2c_client *client;
 614         struct vt8231_data *data;
 615         int err = 0, i;
 616         u16 val;
 617
 618         /* 8231 requires multiple of 256 */
 619         if (force_addr) {
 620                 isa_address = force_addr & 0xFF00;
 621                 dev_warn(&adapter->dev, "forcing ISA address 0x%04X\n",
 622                                  isa_address);
 623                 if (PCIBIOS_SUCCESSFUL != pci_write_config_word(s_bridge,
 624                                                 VT8231_BASE_REG, isa_address))
 625                         return -ENODEV;
 626         }
 627
 628         if (PCIBIOS_SUCCESSFUL !=
 629                 pci_read_config_word(s_bridge, VT8231_ENABLE_REG, &val))
 630                 return -ENODEV;
 631
 632         if (!(val & 0x0001)) {
 633                 dev_warn(&adapter->dev, "enabling sensors\n");
 634                 if (PCIBIOS_SUCCESSFUL !=
 635                         pci_write_config_word(s_bridge, VT8231_ENABLE_REG,
 636                                                           val | 0x0001))
 637                         return -ENODEV;
 638         }
 639
 640         /* Reserve the ISA region */
 641         if (!request_region(isa_address, VT8231_EXTENT,
 642                             vt8231_pci_driver.name)) {
 643                 dev_err(&adapter->dev, "region 0x%x already in use!\n",
 644                            isa_address);
 645                 return -ENODEV;
 646         }
 647
 648         if (!(data = kzalloc(sizeof(struct vt8231_data), GFP_KERNEL))) {
 649                 err = -ENOMEM;
 650                 goto exit_release;
 651         }
 652
 653         client = &data->client;
 654         i2c_set_clientdata(client, data);
 655         client->addr = isa_address;
 656         client->adapter = adapter;
 657         client->driver = &vt8231_driver;
 658         client->dev.parent = &adapter->dev;
 659
 660         /* Fill in the remaining client fields and put into the global list */
 661         strlcpy(client->name, "vt8231", I2C_NAME_SIZE);
 662
 663         init_MUTEX(&data->update_lock);
 664
 665         /* Tell the I2C layer a new client has arrived */
 666         if ((err = i2c_attach_client(client)))
 667                 goto exit_free;
 668
 669         vt8231_init_client(client);
 670
 671         /* Register sysfs hooks */
 672         data->class_dev = hwmon_device_register(&client->dev);
 673         if (IS_ERR(data->class_dev)) {
 674                 err = PTR_ERR(data->class_dev);
 675                 goto exit_detach;
 676         }
 677
 678         /* Must update device information to find out the config field */
 679         data->uch_config = vt8231_read_value(client, VT8231_REG_UCH_CONFIG);
 680
 681         for (i = 0; i < ARRAY_SIZE(cfg_info_temp); i++) {
 682                 if (ISTEMP(i, data->uch_config)) {
 683                         device_create_file(&client->dev,
 684                                            cfg_info_temp[i].input);
 685                         device_create_file(&client->dev, cfg_info_temp[i].max);
 686                         device_create_file(&client->dev, cfg_info_temp[i].min);
 687                 }
 688         }
 689
 690         for (i = 0; i < ARRAY_SIZE(cfg_info_volt); i++) {
 691                 if (ISVOLT(i, data->uch_config)) {
 692                         device_create_file(&client->dev,
 693                                            cfg_info_volt[i].input);
 694                         device_create_file(&client->dev, cfg_info_volt[i].max);
 695                         device_create_file(&client->dev, cfg_info_volt[i].min);
 696                 }
 697         }
 698
 699         device_create_file(&client->dev, &sensor_dev_attr_fan1_input.dev_attr);
 700         device_create_file(&client->dev, &sensor_dev_attr_fan2_input.dev_attr);
 701         device_create_file(&client->dev, &sensor_dev_attr_fan1_min.dev_attr);
 702         device_create_file(&client->dev, &sensor_dev_attr_fan2_min.dev_attr);
 703         device_create_file(&client->dev, &sensor_dev_attr_fan1_div.dev_attr);
 704         device_create_file(&client->dev, &sensor_dev_attr_fan2_div.dev_attr);
 705
 706         device_create_file(&client->dev, &dev_attr_alarms);
 707         return 0;
 708
 709 exit_detach:
 710         i2c_detach_client(client);
 711 exit_free:
 712         kfree(data);
 713 exit_release:
 714         release_region(isa_address, VT8231_EXTENT);
 715         return err;
 716 }
 717
 718 static int vt8231_detach_client(struct i2c_client *client)
 719 {
 720         struct vt8231_data *data = i2c_get_clientdata(client);
 721         int err;
 722
 723         hwmon_device_unregister(data->class_dev);
 724
 725         if ((err = i2c_detach_client(client))) {
 726                 return err;
 727         }
 728
 729         release_region(client->addr, VT8231_EXTENT);
 730         kfree(data);
 731
 732         return 0;
 733 }
 734
 735 static void vt8231_init_client(struct i2c_client *client)
 736 {
 737         vt8231_write_value(client, VT8231_REG_TEMP1_CONFIG, 0);
 738         vt8231_write_value(client, VT8231_REG_TEMP2_CONFIG, 0);
 739 }
 740
 741 static struct vt8231_data *vt8231_update_device(struct device *dev)
 742 {
 743         struct i2c_client *client = to_i2c_client(dev);
 744         struct vt8231_data *data = i2c_get_clientdata(client);
 745         int i;
 746         u16 low;
 747
 748         down(&data->update_lock);
 749
 750         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 751             || !data->valid) {
 752                 for (i = 0; i < 6; i++) {
 753                         if (ISVOLT(i, data->uch_config)) {
 754                                 data->in[i] = vt8231_read_value(client,
 755                                                 regvolt[i]);
 756                                 data->in_min[i] = vt8231_read_value(client,
 757                                                 regvoltmin[i]);
 758                                 data->in_max[i] = vt8231_read_value(client,
 759                                                 regvoltmax[i]);
 760                         }
 761                 }
 762                 for (i = 0; i < 2; i++) {
 763                         data->fan[i] = vt8231_read_value(client,
 764                                                 VT8231_REG_FAN(i));
 765                         data->fan_min[i] = vt8231_read_value(client,
 766                                                 VT8231_REG_FAN_MIN(i));
 767                 }
 768
 769                 low = vt8231_read_value(client, VT8231_REG_TEMP_LOW01);
 770                 low = (low >> 6) | ((low & 0x30) >> 2)
 771                     | (vt8231_read_value(client, VT8231_REG_TEMP_LOW25) << 4);
 772                 for (i = 0; i < 6; i++) {
 773                         if (ISTEMP(i, data->uch_config)) {
 774                                 data->temp[i] = (vt8231_read_value(client,
 775                                                        regtemp[i]) << 2)
 776                                                 | ((low >> (2 * i)) & 0x03);
 777                                 data->temp_max[i] = vt8231_read_value(client,
 778                                                       regtempmax[i]);
 779                                 data->temp_min[i] = vt8231_read_value(client,
 780                                                       regtempmin[i]);
 781                         }
 782                 }
 783
 784                 i = vt8231_read_value(client, VT8231_REG_FANDIV);
 785                 data->fan_div[0] = (i >> 4) & 0x03;
 786                 data->fan_div[1] = i >> 6;
 787                 data->alarms = vt8231_read_value(client, VT8231_REG_ALARM1) |
 788                         (vt8231_read_value(client, VT8231_REG_ALARM2) << 8);
 789
 790                 /* Set alarm flags correctly */
 791                 if (!data->fan[0] && data->fan_min[0]) {
 792                         data->alarms |= 0x40;
 793                 } else if (data->fan[0] && !data->fan_min[0]) {
 794                         data->alarms &= ~0x40;
 795                 }
 796
 797                 if (!data->fan[1] && data->fan_min[1]) {
 798                         data->alarms |= 0x80;
 799                 } else if (data->fan[1] && !data->fan_min[1]) {
 800                         data->alarms &= ~0x80;
 801                 }
 802
 803                 data->last_updated = jiffies;
 804                 data->valid = 1;
 805         }
 806
 807         up(&data->update_lock);
 808
 809         return data;
 810 }
 811
 812 static int __devinit vt8231_pci_probe(struct pci_dev *dev,
 813                                 const struct pci_device_id *id)
 814 {
 815         u16 val;
 816
 817         if (PCIBIOS_SUCCESSFUL != pci_read_config_word(dev, VT8231_BASE_REG,
 818                                                         &val))
 819                 return -ENODEV;
 820
 821         isa_address = val & ~(VT8231_EXTENT - 1);
 822         if (isa_address == 0 && force_addr == 0) {
 823                 dev_err(&dev->dev, "base address not set -\
 824                                  upgrade BIOS or use force_addr=0xaddr\n");
 825                 return -ENODEV;
 826         }
 827
 828         s_bridge = pci_dev_get(dev);
 829
 830         if (i2c_isa_add_driver(&vt8231_driver)) {
 831                 pci_dev_put(s_bridge);
 832                 s_bridge = NULL;
 833         }
 834
 835         /* Always return failure here.  This is to allow other drivers to bind
 836          * to this pci device.  We don't really want to have control over the
 837          * pci device, we only wanted to read as few register values from it.
 838          */
 839         return -ENODEV;
 840 }
 841
 842 static int __init sm_vt8231_init(void)
 843 {
 844         return pci_register_driver(&vt8231_pci_driver);
 845 }
 846
 847 static void __exit sm_vt8231_exit(void)
 848 {
 849         pci_unregister_driver(&vt8231_pci_driver);
 850         if (s_bridge != NULL) {
 851                 i2c_isa_del_driver(&vt8231_driver);
 852                 pci_dev_put(s_bridge);
 853                 s_bridge = NULL;
 854         }
 855 }
 856
 857 MODULE_AUTHOR("Roger Lucas <roger@planbit.co.uk>");
 858 MODULE_DESCRIPTION("VT8231 sensors");
 859 MODULE_LICENSE("GPL");
 860
 861 module_init(sm_vt8231_init);
 862 module_exit(sm_vt8231_exit);