drivers/hwmon/via686a.c

   1 /*
   2     via686a.c - Part of lm_sensors, Linux kernel modules
   3                 for hardware monitoring
   4
   5     Copyright (c) 1998 - 2002  Frodo Looijaard <frodol@dds.nl>,
   6                         Kyösti Mälkki <kmalkki@cc.hut.fi>,
   7                         Mark Studebaker <mdsxyz123@yahoo.com>,
   8                         and Bob Dougherty <bobd@stanford.edu>
   9     (Some conversion-factor data were contributed by Jonathan Teh Soon Yew
  10     <j.teh@iname.com> and Alex van Kaam <darkside@chello.nl>.)
  11
  12     This program is free software; you can redistribute it and/or modify
  13     it under the terms of the GNU General Public License as published by
  14     the Free Software Foundation; either version 2 of the License, or
  15     (at your option) any later version.
  16
  17     This program is distributed in the hope that it will be useful,
  18     but WITHOUT ANY WARRANTY; without even the implied warranty of
  19     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20     GNU General Public License for more details.
  21
  22     You should have received a copy of the GNU General Public License
  23     along with this program; if not, write to the Free Software
  24     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25 */
  26
  27 /*
  28     Supports the Via VT82C686A, VT82C686B south bridges.
  29     Reports all as a 686A.
  30     Warning - only supports a single device.
  31 */
  32
  33 #include <linux/module.h>
  34 #include <linux/slab.h>
  35 #include <linux/pci.h>
  36 #include <linux/jiffies.h>
  37 #include <linux/i2c.h>
  38 #include <linux/i2c-sensor.h>
  39 #include <linux/init.h>
  40 #include <asm/io.h>
  41
  42
  43 /* If force_addr is set to anything different from 0, we forcibly enable
  44    the device at the given address. */
  45 static unsigned short force_addr = 0;
  46 module_param(force_addr, ushort, 0);
  47 MODULE_PARM_DESC(force_addr,
  48                  "Initialize the base address of the sensors");
  49
  50 /* Addresses to scan.
  51    Note that we can't determine the ISA address until we have initialized
  52    our module */
  53 static unsigned short normal_i2c[] = { I2C_CLIENT_END };
  54 static unsigned int normal_isa[] = { 0x0000, I2C_CLIENT_ISA_END };
  55
  56 /* Insmod parameters */
  57 SENSORS_INSMOD_1(via686a);
  58
  59 /*
  60    The Via 686a southbridge has a LM78-like chip integrated on the same IC.
  61    This driver is a customized copy of lm78.c
  62 */
  63
  64 /* Many VIA686A constants specified below */
  65
  66 /* Length of ISA address segment */
  67 #define VIA686A_EXTENT          0x80
  68 #define VIA686A_BASE_REG        0x70
  69 #define VIA686A_ENABLE_REG      0x74
  70
  71 /* The VIA686A registers */
  72 /* ins numbered 0-4 */
  73 #define VIA686A_REG_IN_MAX(nr)  (0x2b + ((nr) * 2))
  74 #define VIA686A_REG_IN_MIN(nr)  (0x2c + ((nr) * 2))
  75 #define VIA686A_REG_IN(nr)      (0x22 + (nr))
  76
  77 /* fans numbered 1-2 */
  78 #define VIA686A_REG_FAN_MIN(nr) (0x3a + (nr))
  79 #define VIA686A_REG_FAN(nr)     (0x28 + (nr))
  80
  81 /* temps numbered 1-3 */
  82 static const u8 VIA686A_REG_TEMP[]      = { 0x20, 0x21, 0x1f };
  83 static const u8 VIA686A_REG_TEMP_OVER[] = { 0x39, 0x3d, 0x1d };
  84 static const u8 VIA686A_REG_TEMP_HYST[] = { 0x3a, 0x3e, 0x1e };
  85 /* bits 7-6 */
  86 #define VIA686A_REG_TEMP_LOW1   0x4b
  87 /* 2 = bits 5-4, 3 = bits 7-6 */
  88 #define VIA686A_REG_TEMP_LOW23  0x49
  89
  90 #define VIA686A_REG_ALARM1      0x41
  91 #define VIA686A_REG_ALARM2      0x42
  92 #define VIA686A_REG_FANDIV      0x47
  93 #define VIA686A_REG_CONFIG      0x40
  94 /* The following register sets temp interrupt mode (bits 1-0 for temp1,
  95  3-2 for temp2, 5-4 for temp3).  Modes are:
  96     00 interrupt stays as long as value is out-of-range
  97     01 interrupt is cleared once register is read (default)
  98     10 comparator mode- like 00, but ignores hysteresis
  99     11 same as 00 */
 100 #define VIA686A_REG_TEMP_MODE           0x4b
 101 /* We'll just assume that you want to set all 3 simultaneously: */
 102 #define VIA686A_TEMP_MODE_MASK          0x3F
 103 #define VIA686A_TEMP_MODE_CONTINUOUS    0x00
 104
 105 /* Conversions. Limit checking is only done on the TO_REG
 106    variants.
 107
 108 ********* VOLTAGE CONVERSIONS (Bob Dougherty) ********
 109  From HWMon.cpp (Copyright 1998-2000 Jonathan Teh Soon Yew):
 110  voltagefactor[0]=1.25/2628; (2628/1.25=2102.4)   // Vccp
 111  voltagefactor[1]=1.25/2628; (2628/1.25=2102.4)   // +2.5V
 112  voltagefactor[2]=1.67/2628; (2628/1.67=1573.7)   // +3.3V
 113  voltagefactor[3]=2.6/2628;  (2628/2.60=1010.8)   // +5V
 114  voltagefactor[4]=6.3/2628;  (2628/6.30=417.14)   // +12V
 115  in[i]=(data[i+2]*25.0+133)*voltagefactor[i];
 116  That is:
 117  volts = (25*regVal+133)*factor
 118  regVal = (volts/factor-133)/25
 119  (These conversions were contributed by Jonathan Teh Soon Yew
 120  <j.teh@iname.com>) */
 121 static inline u8 IN_TO_REG(long val, int inNum)
 122 {
 123         /* To avoid floating point, we multiply constants by 10 (100 for +12V).
 124            Rounding is done (120500 is actually 133000 - 12500).
 125            Remember that val is expressed in 0.001V/bit, which is why we divide
 126            by an additional 10000 (100000 for +12V): 1000 for val and 10 (100)
 127            for the constants. */
 128         if (inNum <= 1)
 129                 return (u8)
 130                     SENSORS_LIMIT((val * 21024 - 1205000) / 250000, 0, 255);
 131         else if (inNum == 2)
 132                 return (u8)
 133                     SENSORS_LIMIT((val * 15737 - 1205000) / 250000, 0, 255);
 134         else if (inNum == 3)
 135                 return (u8)
 136                     SENSORS_LIMIT((val * 10108 - 1205000) / 250000, 0, 255);
 137         else
 138                 return (u8)
 139                     SENSORS_LIMIT((val * 41714 - 12050000) / 2500000, 0, 255);
 140 }
 141
 142 static inline long IN_FROM_REG(u8 val, int inNum)
 143 {
 144         /* To avoid floating point, we multiply constants by 10 (100 for +12V).
 145            We also multiply them by 1000 because we want 0.001V/bit for the
 146            output value. Rounding is done. */
 147         if (inNum <= 1)
 148                 return (long) ((250000 * val + 1330000 + 21024 / 2) / 21024);
 149         else if (inNum == 2)
 150                 return (long) ((250000 * val + 1330000 + 15737 / 2) / 15737);
 151         else if (inNum == 3)
 152                 return (long) ((250000 * val + 1330000 + 10108 / 2) / 10108);
 153         else
 154                 return (long) ((2500000 * val + 13300000 + 41714 / 2) / 41714);
 155 }
 156
 157 /********* FAN RPM CONVERSIONS ********/
 158 /* Higher register values = slower fans (the fan's strobe gates a counter).
 159  But this chip saturates back at 0, not at 255 like all the other chips.
 160  So, 0 means 0 RPM */
 161 static inline u8 FAN_TO_REG(long rpm, int div)
 162 {
 163         if (rpm == 0)
 164                 return 0;
 165         rpm = SENSORS_LIMIT(rpm, 1, 1000000);
 166         return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 255);
 167 }
 168
 169 #define FAN_FROM_REG(val,div) ((val)==0?0:(val)==255?0:1350000/((val)*(div)))
 170
 171 /******** TEMP CONVERSIONS (Bob Dougherty) *********/
 172 /* linear fits from HWMon.cpp (Copyright 1998-2000 Jonathan Teh Soon Yew)
 173       if(temp<169)
 174               return double(temp)*0.427-32.08;
 175       else if(temp>=169 && temp<=202)
 176               return double(temp)*0.582-58.16;
 177       else
 178               return double(temp)*0.924-127.33;
 179
 180  A fifth-order polynomial fits the unofficial data (provided by Alex van
 181  Kaam <darkside@chello.nl>) a bit better.  It also give more reasonable
 182  numbers on my machine (ie. they agree with what my BIOS tells me).
 183  Here's the fifth-order fit to the 8-bit data:
 184  temp = 1.625093e-10*val^5 - 1.001632e-07*val^4 + 2.457653e-05*val^3 -
 185         2.967619e-03*val^2 + 2.175144e-01*val - 7.090067e+0.
 186
 187  (2000-10-25- RFD: thanks to Uwe Andersen <uandersen@mayah.com> for
 188  finding my typos in this formula!)
 189
 190  Alas, none of the elegant function-fit solutions will work because we
 191  aren't allowed to use floating point in the kernel and doing it with
 192  integers doesn't provide enough precision.  So we'll do boring old
 193  look-up table stuff.  The unofficial data (see below) have effectively
 194  7-bit resolution (they are rounded to the nearest degree).  I'm assuming
 195  that the transfer function of the device is monotonic and smooth, so a
 196  smooth function fit to the data will allow us to get better precision.
 197  I used the 5th-order poly fit described above and solved for
 198  VIA register values 0-255.  I *10 before rounding, so we get tenth-degree
 199  precision.  (I could have done all 1024 values for our 10-bit readings,
 200  but the function is very linear in the useful range (0-80 deg C), so
 201  we'll just use linear interpolation for 10-bit readings.)  So, tempLUT
 202  is the temp at via register values 0-255: */
 203 static const long tempLUT[] =
 204 { -709, -688, -667, -646, -627, -607, -589, -570, -553, -536, -519,
 205         -503, -487, -471, -456, -442, -428, -414, -400, -387, -375,
 206         -362, -350, -339, -327, -316, -305, -295, -285, -275, -265,
 207         -255, -246, -237, -229, -220, -212, -204, -196, -188, -180,
 208         -173, -166, -159, -152, -145, -139, -132, -126, -120, -114,
 209         -108, -102, -96, -91, -85, -80, -74, -69, -64, -59, -54, -49,
 210         -44, -39, -34, -29, -25, -20, -15, -11, -6, -2, 3, 7, 12, 16,
 211         20, 25, 29, 33, 37, 42, 46, 50, 54, 59, 63, 67, 71, 75, 79, 84,
 212         88, 92, 96, 100, 104, 109, 113, 117, 121, 125, 130, 134, 138,
 213         142, 146, 151, 155, 159, 163, 168, 172, 176, 181, 185, 189,
 214         193, 198, 202, 206, 211, 215, 219, 224, 228, 232, 237, 241,
 215         245, 250, 254, 259, 263, 267, 272, 276, 281, 285, 290, 294,
 216         299, 303, 307, 312, 316, 321, 325, 330, 334, 339, 344, 348,
 217         353, 357, 362, 366, 371, 376, 380, 385, 390, 395, 399, 404,
 218         409, 414, 419, 423, 428, 433, 438, 443, 449, 454, 459, 464,
 219         469, 475, 480, 486, 491, 497, 502, 508, 514, 520, 526, 532,
 220         538, 544, 551, 557, 564, 571, 578, 584, 592, 599, 606, 614,
 221         621, 629, 637, 645, 654, 662, 671, 680, 689, 698, 708, 718,
 222         728, 738, 749, 759, 770, 782, 793, 805, 818, 830, 843, 856,
 223         870, 883, 898, 912, 927, 943, 958, 975, 991, 1008, 1026, 1044,
 224         1062, 1081, 1101, 1121, 1141, 1162, 1184, 1206, 1229, 1252,
 225         1276, 1301, 1326, 1352, 1378, 1406, 1434, 1462
 226 };
 227
 228 /* the original LUT values from Alex van Kaam <darkside@chello.nl>
 229    (for via register values 12-240):
 230 {-50,-49,-47,-45,-43,-41,-39,-38,-37,-35,-34,-33,-32,-31,
 231 -30,-29,-28,-27,-26,-25,-24,-24,-23,-22,-21,-20,-20,-19,-18,-17,-17,-16,-15,
 232 -15,-14,-14,-13,-12,-12,-11,-11,-10,-9,-9,-8,-8,-7,-7,-6,-6,-5,-5,-4,-4,-3,
 233 -3,-2,-2,-1,-1,0,0,1,1,1,3,3,3,4,4,4,5,5,5,6,6,7,7,8,8,9,9,9,10,10,11,11,12,
 234 12,12,13,13,13,14,14,15,15,16,16,16,17,17,18,18,19,19,20,20,21,21,21,22,22,
 235 22,23,23,24,24,25,25,26,26,26,27,27,27,28,28,29,29,30,30,30,31,31,32,32,33,
 236 33,34,34,35,35,35,36,36,37,37,38,38,39,39,40,40,41,41,42,42,43,43,44,44,45,
 237 45,46,46,47,48,48,49,49,50,51,51,52,52,53,53,54,55,55,56,57,57,58,59,59,60,
 238 61,62,62,63,64,65,66,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,83,84,
 239 85,86,88,89,91,92,94,96,97,99,101,103,105,107,109,110};
 240
 241
 242  Here's the reverse LUT.  I got it by doing a 6-th order poly fit (needed
 243  an extra term for a good fit to these inverse data!) and then
 244  solving for each temp value from -50 to 110 (the useable range for
 245  this chip).  Here's the fit:
 246  viaRegVal = -1.160370e-10*val^6 +3.193693e-08*val^5 - 1.464447e-06*val^4
 247  - 2.525453e-04*val^3 + 1.424593e-02*val^2 + 2.148941e+00*val +7.275808e+01)
 248  Note that n=161: */
 249 static const u8 viaLUT[] =
 250 { 12, 12, 13, 14, 14, 15, 16, 16, 17, 18, 18, 19, 20, 20, 21, 22, 23,
 251         23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 35, 36, 37, 39, 40,
 252         41, 43, 45, 46, 48, 49, 51, 53, 55, 57, 59, 60, 62, 64, 66,
 253         69, 71, 73, 75, 77, 79, 82, 84, 86, 88, 91, 93, 95, 98, 100,
 254         103, 105, 107, 110, 112, 115, 117, 119, 122, 124, 126, 129,
 255         131, 134, 136, 138, 140, 143, 145, 147, 150, 152, 154, 156,
 256         158, 160, 162, 164, 166, 168, 170, 172, 174, 176, 178, 180,
 257         182, 183, 185, 187, 188, 190, 192, 193, 195, 196, 198, 199,
 258         200, 202, 203, 205, 206, 207, 208, 209, 210, 211, 212, 213,
 259         214, 215, 216, 217, 218, 219, 220, 221, 222, 222, 223, 224,
 260         225, 226, 226, 227, 228, 228, 229, 230, 230, 231, 232, 232,
 261         233, 233, 234, 235, 235, 236, 236, 237, 237, 238, 238, 239,
 262         239, 240
 263 };
 264
 265 /* Converting temps to (8-bit) hyst and over registers
 266    No interpolation here.
 267    The +50 is because the temps start at -50 */
 268 static inline u8 TEMP_TO_REG(long val)
 269 {
 270         return viaLUT[val <= -50000 ? 0 : val >= 110000 ? 160 :
 271                       (val < 0 ? val - 500 : val + 500) / 1000 + 50];
 272 }
 273
 274 /* for 8-bit temperature hyst and over registers */
 275 #define TEMP_FROM_REG(val) (tempLUT[(val)] * 100)
 276
 277 /* for 10-bit temperature readings */
 278 static inline long TEMP_FROM_REG10(u16 val)
 279 {
 280         u16 eightBits = val >> 2;
 281         u16 twoBits = val & 3;
 282
 283         /* no interpolation for these */
 284         if (twoBits == 0 || eightBits == 255)
 285                 return TEMP_FROM_REG(eightBits);
 286
 287         /* do some linear interpolation */
 288         return (tempLUT[eightBits] * (4 - twoBits) +
 289                 tempLUT[eightBits + 1] * twoBits) * 25;
 290 }
 291
 292 #define DIV_FROM_REG(val) (1 << (val))
 293 #define DIV_TO_REG(val) ((val)==8?3:(val)==4?2:(val)==1?0:1)
 294
 295 /* For the VIA686A, we need to keep some data in memory.
 296    The structure is dynamically allocated, at the same time when a new
 297    via686a client is allocated. */
 298 struct via686a_data {
 299         struct i2c_client client;
 300         struct semaphore update_lock;
 301         char valid;             /* !=0 if following fields are valid */
 302         unsigned long last_updated;     /* In jiffies */
 303
 304         u8 in[5];               /* Register value */
 305         u8 in_max[5];           /* Register value */
 306         u8 in_min[5];           /* Register value */
 307         u8 fan[2];              /* Register value */
 308         u8 fan_min[2];          /* Register value */
 309         u16 temp[3];            /* Register value 10 bit */
 310         u8 temp_over[3];        /* Register value */
 311         u8 temp_hyst[3];        /* Register value */
 312         u8 fan_div[2];          /* Register encoding, shifted right */
 313         u16 alarms;             /* Register encoding, combined */
 314 };
 315
 316 static struct pci_dev *s_bridge;        /* pointer to the (only) via686a */
 317
 318 static int via686a_attach_adapter(struct i2c_adapter *adapter);
 319 static int via686a_detect(struct i2c_adapter *adapter, int address, int kind);
 320 static int via686a_detach_client(struct i2c_client *client);
 321
 322 static inline int via686a_read_value(struct i2c_client *client, u8 reg)
 323 {
 324         return (inb_p(client->addr + reg));
 325 }
 326
 327 static inline void via686a_write_value(struct i2c_client *client, u8 reg,
 328                                        u8 value)
 329 {
 330         outb_p(value, client->addr + reg);
 331 }
 332
 333 static struct via686a_data *via686a_update_device(struct device *dev);
 334 static void via686a_init_client(struct i2c_client *client);
 335
 336 /* following are the sysfs callback functions */
 337
 338 /* 7 voltage sensors */
 339 static ssize_t show_in(struct device *dev, char *buf, int nr) {
 340         struct via686a_data *data = via686a_update_device(dev);
 341         return sprintf(buf, "%ld\n", IN_FROM_REG(data->in[nr], nr));
 342 }
 343
 344 static ssize_t show_in_min(struct device *dev, char *buf, int nr) {
 345         struct via686a_data *data = via686a_update_device(dev);
 346         return sprintf(buf, "%ld\n", IN_FROM_REG(data->in_min[nr], nr));
 347 }
 348
 349 static ssize_t show_in_max(struct device *dev, char *buf, int nr) {
 350         struct via686a_data *data = via686a_update_device(dev);
 351         return sprintf(buf, "%ld\n", IN_FROM_REG(data->in_max[nr], nr));
 352 }
 353
 354 static ssize_t set_in_min(struct device *dev, const char *buf,
 355                 size_t count, int nr) {
 356         struct i2c_client *client = to_i2c_client(dev);
 357         struct via686a_data *data = i2c_get_clientdata(client);
 358         unsigned long val = simple_strtoul(buf, NULL, 10);
 359
 360         down(&data->update_lock);
 361         data->in_min[nr] = IN_TO_REG(val, nr);
 362         via686a_write_value(client, VIA686A_REG_IN_MIN(nr),
 363                         data->in_min[nr]);
 364         up(&data->update_lock);
 365         return count;
 366 }
 367 static ssize_t set_in_max(struct device *dev, const char *buf,
 368                 size_t count, int nr) {
 369         struct i2c_client *client = to_i2c_client(dev);
 370         struct via686a_data *data = i2c_get_clientdata(client);
 371         unsigned long val = simple_strtoul(buf, NULL, 10);
 372
 373         down(&data->update_lock);
 374         data->in_max[nr] = IN_TO_REG(val, nr);
 375         via686a_write_value(client, VIA686A_REG_IN_MAX(nr),
 376                         data->in_max[nr]);
 377         up(&data->update_lock);
 378         return count;
 379 }
 380 #define show_in_offset(offset)                                  \
 381 static ssize_t                                                  \
 382         show_in##offset (struct device *dev, struct device_attribute *attr, char *buf)          \
 383 {                                                               \
 384         return show_in(dev, buf, offset);                       \
 385 }                                                               \
 386 static ssize_t                                                  \
 387         show_in##offset##_min (struct device *dev, struct device_attribute *attr, char *buf)    \
 388 {                                                               \
 389         return show_in_min(dev, buf, offset);           \
 390 }                                                               \
 391 static ssize_t                                                  \
 392         show_in##offset##_max (struct device *dev, struct device_attribute *attr, char *buf)    \
 393 {                                                               \
 394         return show_in_max(dev, buf, offset);           \
 395 }                                                               \
 396 static ssize_t set_in##offset##_min (struct device *dev, struct device_attribute *attr,         \
 397                 const char *buf, size_t count)                  \
 398 {                                                               \
 399         return set_in_min(dev, buf, count, offset);             \
 400 }                                                               \
 401 static ssize_t set_in##offset##_max (struct device *dev, struct device_attribute *attr, \
 402                         const char *buf, size_t count)          \
 403 {                                                               \
 404         return set_in_max(dev, buf, count, offset);             \
 405 }                                                               \
 406 static DEVICE_ATTR(in##offset##_input, S_IRUGO, show_in##offset, NULL);\
 407 static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,         \
 408                 show_in##offset##_min, set_in##offset##_min);   \
 409 static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,         \
 410                 show_in##offset##_max, set_in##offset##_max);
 411
 412 show_in_offset(0);
 413 show_in_offset(1);
 414 show_in_offset(2);
 415 show_in_offset(3);
 416 show_in_offset(4);
 417
 418 /* 3 temperatures */
 419 static ssize_t show_temp(struct device *dev, char *buf, int nr) {
 420         struct via686a_data *data = via686a_update_device(dev);
 421         return sprintf(buf, "%ld\n", TEMP_FROM_REG10(data->temp[nr]));
 422 }
 423 static ssize_t show_temp_over(struct device *dev, char *buf, int nr) {
 424         struct via686a_data *data = via686a_update_device(dev);
 425         return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp_over[nr]));
 426 }
 427 static ssize_t show_temp_hyst(struct device *dev, char *buf, int nr) {
 428         struct via686a_data *data = via686a_update_device(dev);
 429         return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp_hyst[nr]));
 430 }
 431 static ssize_t set_temp_over(struct device *dev, const char *buf,
 432                 size_t count, int nr) {
 433         struct i2c_client *client = to_i2c_client(dev);
 434         struct via686a_data *data = i2c_get_clientdata(client);
 435         int val = simple_strtol(buf, NULL, 10);
 436
 437         down(&data->update_lock);
 438         data->temp_over[nr] = TEMP_TO_REG(val);
 439         via686a_write_value(client, VIA686A_REG_TEMP_OVER[nr],
 440                             data->temp_over[nr]);
 441         up(&data->update_lock);
 442         return count;
 443 }
 444 static ssize_t set_temp_hyst(struct device *dev, const char *buf,
 445                 size_t count, int nr) {
 446         struct i2c_client *client = to_i2c_client(dev);
 447         struct via686a_data *data = i2c_get_clientdata(client);
 448         int val = simple_strtol(buf, NULL, 10);
 449
 450         down(&data->update_lock);
 451         data->temp_hyst[nr] = TEMP_TO_REG(val);
 452         via686a_write_value(client, VIA686A_REG_TEMP_HYST[nr],
 453                             data->temp_hyst[nr]);
 454         up(&data->update_lock);
 455         return count;
 456 }
 457 #define show_temp_offset(offset)                                        \
 458 static ssize_t show_temp_##offset (struct device *dev, struct device_attribute *attr, char *buf)        \
 459 {                                                                       \
 460         return show_temp(dev, buf, offset - 1);                         \
 461 }                                                                       \
 462 static ssize_t                                                          \
 463 show_temp_##offset##_over (struct device *dev, struct device_attribute *attr, char *buf)                \
 464 {                                                                       \
 465         return show_temp_over(dev, buf, offset - 1);                    \
 466 }                                                                       \
 467 static ssize_t                                                          \
 468 show_temp_##offset##_hyst (struct device *dev, struct device_attribute *attr, char *buf)                \
 469 {                                                                       \
 470         return show_temp_hyst(dev, buf, offset - 1);                    \
 471 }                                                                       \
 472 static ssize_t set_temp_##offset##_over (struct device *dev, struct device_attribute *attr,             \
 473                 const char *buf, size_t count)                          \
 474 {                                                                       \
 475         return set_temp_over(dev, buf, count, offset - 1);              \
 476 }                                                                       \
 477 static ssize_t set_temp_##offset##_hyst (struct device *dev, struct device_attribute *attr,             \
 478                 const char *buf, size_t count)                          \
 479 {                                                                       \
 480         return set_temp_hyst(dev, buf, count, offset - 1);              \
 481 }                                                                       \
 482 static DEVICE_ATTR(temp##offset##_input, S_IRUGO, show_temp_##offset, NULL);\
 483 static DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,               \
 484                 show_temp_##offset##_over, set_temp_##offset##_over);   \
 485 static DEVICE_ATTR(temp##offset##_max_hyst, S_IRUGO | S_IWUSR,          \
 486                 show_temp_##offset##_hyst, set_temp_##offset##_hyst);
 487
 488 show_temp_offset(1);
 489 show_temp_offset(2);
 490 show_temp_offset(3);
 491
 492 /* 2 Fans */
 493 static ssize_t show_fan(struct device *dev, char *buf, int nr) {
 494         struct via686a_data *data = via686a_update_device(dev);
 495         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
 496                                 DIV_FROM_REG(data->fan_div[nr])) );
 497 }
 498 static ssize_t show_fan_min(struct device *dev, char *buf, int nr) {
 499         struct via686a_data *data = via686a_update_device(dev);
 500         return sprintf(buf, "%d\n",
 501                 FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr])) );
 502 }
 503 static ssize_t show_fan_div(struct device *dev, char *buf, int nr) {
 504         struct via686a_data *data = via686a_update_device(dev);
 505         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]) );
 506 }
 507 static ssize_t set_fan_min(struct device *dev, const char *buf,
 508                 size_t count, int nr) {
 509         struct i2c_client *client = to_i2c_client(dev);
 510         struct via686a_data *data = i2c_get_clientdata(client);
 511         int val = simple_strtol(buf, NULL, 10);
 512
 513         down(&data->update_lock);
 514         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
 515         via686a_write_value(client, VIA686A_REG_FAN_MIN(nr+1), data->fan_min[nr]);
 516         up(&data->update_lock);
 517         return count;
 518 }
 519 static ssize_t set_fan_div(struct device *dev, const char *buf,
 520                 size_t count, int nr) {
 521         struct i2c_client *client = to_i2c_client(dev);
 522         struct via686a_data *data = i2c_get_clientdata(client);
 523         int val = simple_strtol(buf, NULL, 10);
 524         int old;
 525
 526         down(&data->update_lock);
 527         old = via686a_read_value(client, VIA686A_REG_FANDIV);
 528         data->fan_div[nr] = DIV_TO_REG(val);
 529         old = (old & 0x0f) | (data->fan_div[1] << 6) | (data->fan_div[0] << 4);
 530         via686a_write_value(client, VIA686A_REG_FANDIV, old);
 531         up(&data->update_lock);
 532         return count;
 533 }
 534
 535 #define show_fan_offset(offset)                                         \
 536 static ssize_t show_fan_##offset (struct device *dev, struct device_attribute *attr, char *buf) \
 537 {                                                                       \
 538         return show_fan(dev, buf, offset - 1);                          \
 539 }                                                                       \
 540 static ssize_t show_fan_##offset##_min (struct device *dev, struct device_attribute *attr, char *buf)   \
 541 {                                                                       \
 542         return show_fan_min(dev, buf, offset - 1);                      \
 543 }                                                                       \
 544 static ssize_t show_fan_##offset##_div (struct device *dev, struct device_attribute *attr, char *buf)   \
 545 {                                                                       \
 546         return show_fan_div(dev, buf, offset - 1);                      \
 547 }                                                                       \
 548 static ssize_t set_fan_##offset##_min (struct device *dev, struct device_attribute *attr,               \
 549         const char *buf, size_t count)                                  \
 550 {                                                                       \
 551         return set_fan_min(dev, buf, count, offset - 1);                \
 552 }                                                                       \
 553 static ssize_t set_fan_##offset##_div (struct device *dev, struct device_attribute *attr,               \
 554                 const char *buf, size_t count)                          \
 555 {                                                                       \
 556         return set_fan_div(dev, buf, count, offset - 1);                \
 557 }                                                                       \
 558 static DEVICE_ATTR(fan##offset##_input, S_IRUGO, show_fan_##offset, NULL);\
 559 static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR,                \
 560                 show_fan_##offset##_min, set_fan_##offset##_min);       \
 561 static DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR,                \
 562                 show_fan_##offset##_div, set_fan_##offset##_div);
 563
 564 show_fan_offset(1);
 565 show_fan_offset(2);
 566
 567 /* Alarms */
 568 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf) {
 569         struct via686a_data *data = via686a_update_device(dev);
 570         return sprintf(buf, "%u\n", data->alarms);
 571 }
 572 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 573
 574 /* The driver. I choose to use type i2c_driver, as at is identical to both
 575    smbus_driver and isa_driver, and clients could be of either kind */
 576 static struct i2c_driver via686a_driver = {
 577         .owner          = THIS_MODULE,
 578         .name           = "via686a",
 579         .id             = I2C_DRIVERID_VIA686A,
 580         .flags          = I2C_DF_NOTIFY,
 581         .attach_adapter = via686a_attach_adapter,
 582         .detach_client  = via686a_detach_client,
 583 };
 584
 585
 586 /* This is called when the module is loaded */
 587 static int via686a_attach_adapter(struct i2c_adapter *adapter)
 588 {
 589         if (!(adapter->class & I2C_CLASS_HWMON))
 590                 return 0;
 591         return i2c_detect(adapter, &addr_data, via686a_detect);
 592 }
 593
 594 static int via686a_detect(struct i2c_adapter *adapter, int address, int kind)
 595 {
 596         struct i2c_client *new_client;
 597         struct via686a_data *data;
 598         int err = 0;
 599         const char client_name[] = "via686a";
 600         u16 val;
 601
 602         /* Make sure we are probing the ISA bus!!  */
 603         if (!i2c_is_isa_adapter(adapter)) {
 604                 dev_err(&adapter->dev,
 605                 "via686a_detect called for an I2C bus adapter?!?\n");
 606                 return 0;
 607         }
 608
 609         /* 8231 requires multiple of 256, we enforce that on 686 as well */
 610         if (force_addr)
 611                 address = force_addr & 0xFF00;
 612
 613         if (force_addr) {
 614                 dev_warn(&adapter->dev, "forcing ISA address 0x%04X\n",
 615                          address);
 616                 if (PCIBIOS_SUCCESSFUL !=
 617                     pci_write_config_word(s_bridge, VIA686A_BASE_REG, address))
 618                         return -ENODEV;
 619         }
 620         if (PCIBIOS_SUCCESSFUL !=
 621             pci_read_config_word(s_bridge, VIA686A_ENABLE_REG, &val))
 622                 return -ENODEV;
 623         if (!(val & 0x0001)) {
 624                 dev_warn(&adapter->dev, "enabling sensors\n");
 625                 if (PCIBIOS_SUCCESSFUL !=
 626                     pci_write_config_word(s_bridge, VIA686A_ENABLE_REG,
 627                                           val | 0x0001))
 628                         return -ENODEV;
 629         }
 630
 631         /* Reserve the ISA region */
 632         if (!request_region(address, VIA686A_EXTENT, via686a_driver.name)) {
 633                 dev_err(&adapter->dev, "region 0x%x already in use!\n",
 634                         address);
 635                 return -ENODEV;
 636         }
 637
 638         if (!(data = kmalloc(sizeof(struct via686a_data), GFP_KERNEL))) {
 639                 err = -ENOMEM;
 640                 goto ERROR0;
 641         }
 642         memset(data, 0, sizeof(struct via686a_data));
 643
 644         new_client = &data->client;
 645         i2c_set_clientdata(new_client, data);
 646         new_client->addr = address;
 647         new_client->adapter = adapter;
 648         new_client->driver = &via686a_driver;
 649         new_client->flags = 0;
 650
 651         /* Fill in the remaining client fields and put into the global list */
 652         strlcpy(new_client->name, client_name, I2C_NAME_SIZE);
 653
 654         data->valid = 0;
 655         init_MUTEX(&data->update_lock);
 656         /* Tell the I2C layer a new client has arrived */
 657         if ((err = i2c_attach_client(new_client)))
 658                 goto ERROR3;
 659
 660         /* Initialize the VIA686A chip */
 661         via686a_init_client(new_client);
 662
 663         /* Register sysfs hooks */
 664         device_create_file(&new_client->dev, &dev_attr_in0_input);
 665         device_create_file(&new_client->dev, &dev_attr_in1_input);
 666         device_create_file(&new_client->dev, &dev_attr_in2_input);
 667         device_create_file(&new_client->dev, &dev_attr_in3_input);
 668         device_create_file(&new_client->dev, &dev_attr_in4_input);
 669         device_create_file(&new_client->dev, &dev_attr_in0_min);
 670         device_create_file(&new_client->dev, &dev_attr_in1_min);
 671         device_create_file(&new_client->dev, &dev_attr_in2_min);
 672         device_create_file(&new_client->dev, &dev_attr_in3_min);
 673         device_create_file(&new_client->dev, &dev_attr_in4_min);
 674         device_create_file(&new_client->dev, &dev_attr_in0_max);
 675         device_create_file(&new_client->dev, &dev_attr_in1_max);
 676         device_create_file(&new_client->dev, &dev_attr_in2_max);
 677         device_create_file(&new_client->dev, &dev_attr_in3_max);
 678         device_create_file(&new_client->dev, &dev_attr_in4_max);
 679         device_create_file(&new_client->dev, &dev_attr_temp1_input);
 680         device_create_file(&new_client->dev, &dev_attr_temp2_input);
 681         device_create_file(&new_client->dev, &dev_attr_temp3_input);
 682         device_create_file(&new_client->dev, &dev_attr_temp1_max);
 683         device_create_file(&new_client->dev, &dev_attr_temp2_max);
 684         device_create_file(&new_client->dev, &dev_attr_temp3_max);
 685         device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst);
 686         device_create_file(&new_client->dev, &dev_attr_temp2_max_hyst);
 687         device_create_file(&new_client->dev, &dev_attr_temp3_max_hyst);
 688         device_create_file(&new_client->dev, &dev_attr_fan1_input);
 689         device_create_file(&new_client->dev, &dev_attr_fan2_input);
 690         device_create_file(&new_client->dev, &dev_attr_fan1_min);
 691         device_create_file(&new_client->dev, &dev_attr_fan2_min);
 692         device_create_file(&new_client->dev, &dev_attr_fan1_div);
 693         device_create_file(&new_client->dev, &dev_attr_fan2_div);
 694         device_create_file(&new_client->dev, &dev_attr_alarms);
 695
 696         return 0;
 697
 698 ERROR3:
 699         kfree(data);
 700 ERROR0:
 701         release_region(address, VIA686A_EXTENT);
 702         return err;
 703 }
 704
 705 static int via686a_detach_client(struct i2c_client *client)
 706 {
 707         int err;
 708
 709         if ((err = i2c_detach_client(client))) {
 710                 dev_err(&client->dev,
 711                 "Client deregistration failed, client not detached.\n");
 712                 return err;
 713         }
 714
 715         release_region(client->addr, VIA686A_EXTENT);
 716         kfree(i2c_get_clientdata(client));
 717
 718         return 0;
 719 }
 720
 721 /* Called when we have found a new VIA686A. Set limits, etc. */
 722 static void via686a_init_client(struct i2c_client *client)
 723 {
 724         u8 reg;
 725
 726         /* Start monitoring */
 727         reg = via686a_read_value(client, VIA686A_REG_CONFIG);
 728         via686a_write_value(client, VIA686A_REG_CONFIG, (reg|0x01)&0x7F);
 729
 730         /* Configure temp interrupt mode for continuous-interrupt operation */
 731         via686a_write_value(client, VIA686A_REG_TEMP_MODE,
 732                             via686a_read_value(client, VIA686A_REG_TEMP_MODE) &
 733                             !(VIA686A_TEMP_MODE_MASK | VIA686A_TEMP_MODE_CONTINUOUS));
 734 }
 735
 736 static struct via686a_data *via686a_update_device(struct device *dev)
 737 {
 738         struct i2c_client *client = to_i2c_client(dev);
 739         struct via686a_data *data = i2c_get_clientdata(client);
 740         int i;
 741
 742         down(&data->update_lock);
 743
 744         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 745             || !data->valid) {
 746                 for (i = 0; i <= 4; i++) {
 747                         data->in[i] =
 748                             via686a_read_value(client, VIA686A_REG_IN(i));
 749                         data->in_min[i] = via686a_read_value(client,
 750                                                              VIA686A_REG_IN_MIN
 751                                                              (i));
 752                         data->in_max[i] =
 753                             via686a_read_value(client, VIA686A_REG_IN_MAX(i));
 754                 }
 755                 for (i = 1; i <= 2; i++) {
 756                         data->fan[i - 1] =
 757                             via686a_read_value(client, VIA686A_REG_FAN(i));
 758                         data->fan_min[i - 1] = via686a_read_value(client,
 759                                                      VIA686A_REG_FAN_MIN(i));
 760                 }
 761                 for (i = 0; i <= 2; i++) {
 762                         data->temp[i] = via686a_read_value(client,
 763                                                  VIA686A_REG_TEMP[i]) << 2;
 764                         data->temp_over[i] =
 765                             via686a_read_value(client,
 766                                                VIA686A_REG_TEMP_OVER[i]);
 767                         data->temp_hyst[i] =
 768                             via686a_read_value(client,
 769                                                VIA686A_REG_TEMP_HYST[i]);
 770                 }
 771                 /* add in lower 2 bits
 772                    temp1 uses bits 7-6 of VIA686A_REG_TEMP_LOW1
 773                    temp2 uses bits 5-4 of VIA686A_REG_TEMP_LOW23
 774                    temp3 uses bits 7-6 of VIA686A_REG_TEMP_LOW23
 775                  */
 776                 data->temp[0] |= (via686a_read_value(client,
 777                                                      VIA686A_REG_TEMP_LOW1)
 778                                   & 0xc0) >> 6;
 779                 data->temp[1] |=
 780                     (via686a_read_value(client, VIA686A_REG_TEMP_LOW23) &
 781                      0x30) >> 4;
 782                 data->temp[2] |=
 783                     (via686a_read_value(client, VIA686A_REG_TEMP_LOW23) &
 784                      0xc0) >> 6;
 785
 786                 i = via686a_read_value(client, VIA686A_REG_FANDIV);
 787                 data->fan_div[0] = (i >> 4) & 0x03;
 788                 data->fan_div[1] = i >> 6;
 789                 data->alarms =
 790                     via686a_read_value(client,
 791                                        VIA686A_REG_ALARM1) |
 792                     (via686a_read_value(client, VIA686A_REG_ALARM2) << 8);
 793                 data->last_updated = jiffies;
 794                 data->valid = 1;
 795         }
 796
 797         up(&data->update_lock);
 798
 799         return data;
 800 }
 801
 802 static struct pci_device_id via686a_pci_ids[] = {
 803         { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_4) },
 804         { 0, }
 805 };
 806
 807 MODULE_DEVICE_TABLE(pci, via686a_pci_ids);
 808
 809 static int __devinit via686a_pci_probe(struct pci_dev *dev,
 810                                        const struct pci_device_id *id)
 811 {
 812         u16 val;
 813         int addr = 0;
 814
 815         if (PCIBIOS_SUCCESSFUL !=
 816             pci_read_config_word(dev, VIA686A_BASE_REG, &val))
 817                 return -ENODEV;
 818
 819         addr = val & ~(VIA686A_EXTENT - 1);
 820         if (addr == 0 && force_addr == 0) {
 821                 dev_err(&dev->dev, "base address not set - upgrade BIOS "
 822                         "or use force_addr=0xaddr\n");
 823                 return -ENODEV;
 824         }
 825         if (force_addr)
 826                 addr = force_addr;      /* so detect will get called */
 827
 828         if (!addr) {
 829                 dev_err(&dev->dev, "No Via 686A sensors found.\n");
 830                 return -ENODEV;
 831         }
 832         normal_isa[0] = addr;
 833
 834         s_bridge = pci_dev_get(dev);
 835         if (i2c_add_driver(&via686a_driver)) {
 836                 pci_dev_put(s_bridge);
 837                 s_bridge = NULL;
 838         }
 839
 840         /* Always return failure here.  This is to allow other drivers to bind
 841          * to this pci device.  We don't really want to have control over the
 842          * pci device, we only wanted to read as few register values from it.
 843          */
 844         return -ENODEV;
 845 }
 846
 847 static struct pci_driver via686a_pci_driver = {
 848         .name           = "via686a",
 849         .id_table       = via686a_pci_ids,
 850         .probe          = via686a_pci_probe,
 851 };
 852
 853 static int __init sm_via686a_init(void)
 854 {
 855         return pci_register_driver(&via686a_pci_driver);
 856 }
 857
 858 static void __exit sm_via686a_exit(void)
 859 {
 860         pci_unregister_driver(&via686a_pci_driver);
 861         if (s_bridge != NULL) {
 862                 i2c_del_driver(&via686a_driver);
 863                 pci_dev_put(s_bridge);
 864                 s_bridge = NULL;
 865         }
 866 }
 867
 868 MODULE_AUTHOR("Kyösti Mälkki <kmalkki@cc.hut.fi>, "
 869               "Mark Studebaker <mdsxyz123@yahoo.com> "
 870               "and Bob Dougherty <bobd@stanford.edu>");
 871 MODULE_DESCRIPTION("VIA 686A Sensor device");
 872 MODULE_LICENSE("GPL");
 873
 874 module_init(sm_via686a_init);
 875 module_exit(sm_via686a_exit);