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-isa.h>
  39 #include <linux/hwmon.h>
  40 #include <linux/err.h>
  41 #include <linux/init.h>
  42 #include <linux/mutex.h>
  43 #include <asm/io.h>
  44
  45
  46 /* If force_addr is set to anything different from 0, we forcibly enable
  47    the device at the given address. */
  48 static unsigned short force_addr;
  49 module_param(force_addr, ushort, 0);
  50 MODULE_PARM_DESC(force_addr,
  51                  "Initialize the base address of the sensors");
  52
  53 /* Device address
  54    Note that we can't determine the ISA address until we have initialized
  55    our module */
  56 static unsigned short address;
  57
  58 /*
  59    The Via 686a southbridge has a LM78-like chip integrated on the same IC.
  60    This driver is a customized copy of lm78.c
  61 */
  62
  63 /* Many VIA686A constants specified below */
  64
  65 /* Length of ISA address segment */
  66 #define VIA686A_EXTENT          0x80
  67 #define VIA686A_BASE_REG        0x70
  68 #define VIA686A_ENABLE_REG      0x74
  69
  70 /* The VIA686A registers */
  71 /* ins numbered 0-4 */
  72 #define VIA686A_REG_IN_MAX(nr)  (0x2b + ((nr) * 2))
  73 #define VIA686A_REG_IN_MIN(nr)  (0x2c + ((nr) * 2))
  74 #define VIA686A_REG_IN(nr)      (0x22 + (nr))
  75
  76 /* fans numbered 1-2 */
  77 #define VIA686A_REG_FAN_MIN(nr) (0x3a + (nr))
  78 #define VIA686A_REG_FAN(nr)     (0x28 + (nr))
  79
  80 /* temps numbered 1-3 */
  81 static const u8 VIA686A_REG_TEMP[]      = { 0x20, 0x21, 0x1f };
  82 static const u8 VIA686A_REG_TEMP_OVER[] = { 0x39, 0x3d, 0x1d };
  83 static const u8 VIA686A_REG_TEMP_HYST[] = { 0x3a, 0x3e, 0x1e };
  84 /* bits 7-6 */
  85 #define VIA686A_REG_TEMP_LOW1   0x4b
  86 /* 2 = bits 5-4, 3 = bits 7-6 */
  87 #define VIA686A_REG_TEMP_LOW23  0x49
  88
  89 #define VIA686A_REG_ALARM1      0x41
  90 #define VIA686A_REG_ALARM2      0x42
  91 #define VIA686A_REG_FANDIV      0x47
  92 #define VIA686A_REG_CONFIG      0x40
  93 /* The following register sets temp interrupt mode (bits 1-0 for temp1,
  94  3-2 for temp2, 5-4 for temp3).  Modes are:
  95     00 interrupt stays as long as value is out-of-range
  96     01 interrupt is cleared once register is read (default)
  97     10 comparator mode- like 00, but ignores hysteresis
  98     11 same as 00 */
  99 #define VIA686A_REG_TEMP_MODE           0x4b
 100 /* We'll just assume that you want to set all 3 simultaneously: */
 101 #define VIA686A_TEMP_MODE_MASK          0x3F
 102 #define VIA686A_TEMP_MODE_CONTINUOUS    0x00
 103
 104 /* Conversions. Limit checking is only done on the TO_REG
 105    variants.
 106
 107 ********* VOLTAGE CONVERSIONS (Bob Dougherty) ********
 108  From HWMon.cpp (Copyright 1998-2000 Jonathan Teh Soon Yew):
 109  voltagefactor[0]=1.25/2628; (2628/1.25=2102.4)   // Vccp
 110  voltagefactor[1]=1.25/2628; (2628/1.25=2102.4)   // +2.5V
 111  voltagefactor[2]=1.67/2628; (2628/1.67=1573.7)   // +3.3V
 112  voltagefactor[3]=2.6/2628;  (2628/2.60=1010.8)   // +5V
 113  voltagefactor[4]=6.3/2628;  (2628/6.30=417.14)   // +12V
 114  in[i]=(data[i+2]*25.0+133)*voltagefactor[i];
 115  That is:
 116  volts = (25*regVal+133)*factor
 117  regVal = (volts/factor-133)/25
 118  (These conversions were contributed by Jonathan Teh Soon Yew
 119  <j.teh@iname.com>) */
 120 static inline u8 IN_TO_REG(long val, int inNum)
 121 {
 122         /* To avoid floating point, we multiply constants by 10 (100 for +12V).
 123            Rounding is done (120500 is actually 133000 - 12500).
 124            Remember that val is expressed in 0.001V/bit, which is why we divide
 125            by an additional 10000 (100000 for +12V): 1000 for val and 10 (100)
 126            for the constants. */
 127         if (inNum <= 1)
 128                 return (u8)
 129                     SENSORS_LIMIT((val * 21024 - 1205000) / 250000, 0, 255);
 130         else if (inNum == 2)
 131                 return (u8)
 132                     SENSORS_LIMIT((val * 15737 - 1205000) / 250000, 0, 255);
 133         else if (inNum == 3)
 134                 return (u8)
 135                     SENSORS_LIMIT((val * 10108 - 1205000) / 250000, 0, 255);
 136         else
 137                 return (u8)
 138                     SENSORS_LIMIT((val * 41714 - 12050000) / 2500000, 0, 255);
 139 }
 140
 141 static inline long IN_FROM_REG(u8 val, int inNum)
 142 {
 143         /* To avoid floating point, we multiply constants by 10 (100 for +12V).
 144            We also multiply them by 1000 because we want 0.001V/bit for the
 145            output value. Rounding is done. */
 146         if (inNum <= 1)
 147                 return (long) ((250000 * val + 1330000 + 21024 / 2) / 21024);
 148         else if (inNum == 2)
 149                 return (long) ((250000 * val + 1330000 + 15737 / 2) / 15737);
 150         else if (inNum == 3)
 151                 return (long) ((250000 * val + 1330000 + 10108 / 2) / 10108);
 152         else
 153                 return (long) ((2500000 * val + 13300000 + 41714 / 2) / 41714);
 154 }
 155
 156 /********* FAN RPM CONVERSIONS ********/
 157 /* Higher register values = slower fans (the fan's strobe gates a counter).
 158  But this chip saturates back at 0, not at 255 like all the other chips.
 159  So, 0 means 0 RPM */
 160 static inline u8 FAN_TO_REG(long rpm, int div)
 161 {
 162         if (rpm == 0)
 163                 return 0;
 164         rpm = SENSORS_LIMIT(rpm, 1, 1000000);
 165         return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 255);
 166 }
 167
 168 #define FAN_FROM_REG(val,div) ((val)==0?0:(val)==255?0:1350000/((val)*(div)))
 169
 170 /******** TEMP CONVERSIONS (Bob Dougherty) *********/
 171 /* linear fits from HWMon.cpp (Copyright 1998-2000 Jonathan Teh Soon Yew)
 172       if(temp<169)
 173               return double(temp)*0.427-32.08;
 174       else if(temp>=169 && temp<=202)
 175               return double(temp)*0.582-58.16;
 176       else
 177               return double(temp)*0.924-127.33;
 178
 179  A fifth-order polynomial fits the unofficial data (provided by Alex van
 180  Kaam <darkside@chello.nl>) a bit better.  It also give more reasonable
 181  numbers on my machine (ie. they agree with what my BIOS tells me).
 182  Here's the fifth-order fit to the 8-bit data:
 183  temp = 1.625093e-10*val^5 - 1.001632e-07*val^4 + 2.457653e-05*val^3 -
 184         2.967619e-03*val^2 + 2.175144e-01*val - 7.090067e+0.
 185
 186  (2000-10-25- RFD: thanks to Uwe Andersen <uandersen@mayah.com> for
 187  finding my typos in this formula!)
 188
 189  Alas, none of the elegant function-fit solutions will work because we
 190  aren't allowed to use floating point in the kernel and doing it with
 191  integers doesn't provide enough precision.  So we'll do boring old
 192  look-up table stuff.  The unofficial data (see below) have effectively
 193  7-bit resolution (they are rounded to the nearest degree).  I'm assuming
 194  that the transfer function of the device is monotonic and smooth, so a
 195  smooth function fit to the data will allow us to get better precision.
 196  I used the 5th-order poly fit described above and solved for
 197  VIA register values 0-255.  I *10 before rounding, so we get tenth-degree
 198  precision.  (I could have done all 1024 values for our 10-bit readings,
 199  but the function is very linear in the useful range (0-80 deg C), so
 200  we'll just use linear interpolation for 10-bit readings.)  So, tempLUT
 201  is the temp at via register values 0-255: */
 202 static const s16 tempLUT[] =
 203 { -709, -688, -667, -646, -627, -607, -589, -570, -553, -536, -519,
 204         -503, -487, -471, -456, -442, -428, -414, -400, -387, -375,
 205         -362, -350, -339, -327, -316, -305, -295, -285, -275, -265,
 206         -255, -246, -237, -229, -220, -212, -204, -196, -188, -180,
 207         -173, -166, -159, -152, -145, -139, -132, -126, -120, -114,
 208         -108, -102, -96, -91, -85, -80, -74, -69, -64, -59, -54, -49,
 209         -44, -39, -34, -29, -25, -20, -15, -11, -6, -2, 3, 7, 12, 16,
 210         20, 25, 29, 33, 37, 42, 46, 50, 54, 59, 63, 67, 71, 75, 79, 84,
 211         88, 92, 96, 100, 104, 109, 113, 117, 121, 125, 130, 134, 138,
 212         142, 146, 151, 155, 159, 163, 168, 172, 176, 181, 185, 189,
 213         193, 198, 202, 206, 211, 215, 219, 224, 228, 232, 237, 241,
 214         245, 250, 254, 259, 263, 267, 272, 276, 281, 285, 290, 294,
 215         299, 303, 307, 312, 316, 321, 325, 330, 334, 339, 344, 348,
 216         353, 357, 362, 366, 371, 376, 380, 385, 390, 395, 399, 404,
 217         409, 414, 419, 423, 428, 433, 438, 443, 449, 454, 459, 464,
 218         469, 475, 480, 486, 491, 497, 502, 508, 514, 520, 526, 532,
 219         538, 544, 551, 557, 564, 571, 578, 584, 592, 599, 606, 614,
 220         621, 629, 637, 645, 654, 662, 671, 680, 689, 698, 708, 718,
 221         728, 738, 749, 759, 770, 782, 793, 805, 818, 830, 843, 856,
 222         870, 883, 898, 912, 927, 943, 958, 975, 991, 1008, 1026, 1044,
 223         1062, 1081, 1101, 1121, 1141, 1162, 1184, 1206, 1229, 1252,
 224         1276, 1301, 1326, 1352, 1378, 1406, 1434, 1462
 225 };
 226
 227 /* the original LUT values from Alex van Kaam <darkside@chello.nl>
 228    (for via register values 12-240):
 229 {-50,-49,-47,-45,-43,-41,-39,-38,-37,-35,-34,-33,-32,-31,
 230 -30,-29,-28,-27,-26,-25,-24,-24,-23,-22,-21,-20,-20,-19,-18,-17,-17,-16,-15,
 231 -15,-14,-14,-13,-12,-12,-11,-11,-10,-9,-9,-8,-8,-7,-7,-6,-6,-5,-5,-4,-4,-3,
 232 -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,
 233 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,
 234 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,
 235 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,
 236 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,
 237 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,
 238 85,86,88,89,91,92,94,96,97,99,101,103,105,107,109,110};
 239
 240
 241  Here's the reverse LUT.  I got it by doing a 6-th order poly fit (needed
 242  an extra term for a good fit to these inverse data!) and then
 243  solving for each temp value from -50 to 110 (the useable range for
 244  this chip).  Here's the fit:
 245  viaRegVal = -1.160370e-10*val^6 +3.193693e-08*val^5 - 1.464447e-06*val^4
 246  - 2.525453e-04*val^3 + 1.424593e-02*val^2 + 2.148941e+00*val +7.275808e+01)
 247  Note that n=161: */
 248 static const u8 viaLUT[] =
 249 { 12, 12, 13, 14, 14, 15, 16, 16, 17, 18, 18, 19, 20, 20, 21, 22, 23,
 250         23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 35, 36, 37, 39, 40,
 251         41, 43, 45, 46, 48, 49, 51, 53, 55, 57, 59, 60, 62, 64, 66,
 252         69, 71, 73, 75, 77, 79, 82, 84, 86, 88, 91, 93, 95, 98, 100,
 253         103, 105, 107, 110, 112, 115, 117, 119, 122, 124, 126, 129,
 254         131, 134, 136, 138, 140, 143, 145, 147, 150, 152, 154, 156,
 255         158, 160, 162, 164, 166, 168, 170, 172, 174, 176, 178, 180,
 256         182, 183, 185, 187, 188, 190, 192, 193, 195, 196, 198, 199,
 257         200, 202, 203, 205, 206, 207, 208, 209, 210, 211, 212, 213,
 258         214, 215, 216, 217, 218, 219, 220, 221, 222, 222, 223, 224,
 259         225, 226, 226, 227, 228, 228, 229, 230, 230, 231, 232, 232,
 260         233, 233, 234, 235, 235, 236, 236, 237, 237, 238, 238, 239,
 261         239, 240
 262 };
 263
 264 /* Converting temps to (8-bit) hyst and over registers
 265    No interpolation here.
 266    The +50 is because the temps start at -50 */
 267 static inline u8 TEMP_TO_REG(long val)
 268 {
 269         return viaLUT[val <= -50000 ? 0 : val >= 110000 ? 160 :
 270                       (val < 0 ? val - 500 : val + 500) / 1000 + 50];
 271 }
 272
 273 /* for 8-bit temperature hyst and over registers */
 274 #define TEMP_FROM_REG(val)      ((long)tempLUT[val] * 100)
 275
 276 /* for 10-bit temperature readings */
 277 static inline long TEMP_FROM_REG10(u16 val)
 278 {
 279         u16 eightBits = val >> 2;
 280         u16 twoBits = val & 3;
 281
 282         /* no interpolation for these */
 283         if (twoBits == 0 || eightBits == 255)
 284                 return TEMP_FROM_REG(eightBits);
 285
 286         /* do some linear interpolation */
 287         return (tempLUT[eightBits] * (4 - twoBits) +
 288                 tempLUT[eightBits + 1] * twoBits) * 25;
 289 }
 290
 291 #define DIV_FROM_REG(val) (1 << (val))
 292 #define DIV_TO_REG(val) ((val)==8?3:(val)==4?2:(val)==1?0:1)
 293
 294 /* For the VIA686A, we need to keep some data in memory.
 295    The structure is dynamically allocated, at the same time when a new
 296    via686a client is allocated. */
 297 struct via686a_data {
 298         struct i2c_client client;
 299         struct class_device *class_dev;
 300         struct mutex 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_detect(struct i2c_adapter *adapter);
 319 static int via686a_detach_client(struct i2c_client *client);
 320
 321 static inline int via686a_read_value(struct i2c_client *client, u8 reg)
 322 {
 323         return (inb_p(client->addr + reg));
 324 }
 325
 326 static inline void via686a_write_value(struct i2c_client *client, u8 reg,
 327                                        u8 value)
 328 {
 329         outb_p(value, client->addr + reg);
 330 }
 331
 332 static struct via686a_data *via686a_update_device(struct device *dev);
 333 static void via686a_init_client(struct i2c_client *client);
 334
 335 /* following are the sysfs callback functions */
 336
 337 /* 7 voltage sensors */
 338 static ssize_t show_in(struct device *dev, char *buf, int nr) {
 339         struct via686a_data *data = via686a_update_device(dev);
 340         return sprintf(buf, "%ld\n", IN_FROM_REG(data->in[nr], nr));
 341 }
 342
 343 static ssize_t show_in_min(struct device *dev, char *buf, int nr) {
 344         struct via686a_data *data = via686a_update_device(dev);
 345         return sprintf(buf, "%ld\n", IN_FROM_REG(data->in_min[nr], nr));
 346 }
 347
 348 static ssize_t show_in_max(struct device *dev, char *buf, int nr) {
 349         struct via686a_data *data = via686a_update_device(dev);
 350         return sprintf(buf, "%ld\n", IN_FROM_REG(data->in_max[nr], nr));
 351 }
 352
 353 static ssize_t set_in_min(struct device *dev, const char *buf,
 354                 size_t count, int nr) {
 355         struct i2c_client *client = to_i2c_client(dev);
 356         struct via686a_data *data = i2c_get_clientdata(client);
 357         unsigned long val = simple_strtoul(buf, NULL, 10);
 358
 359         mutex_lock(&data->update_lock);
 360         data->in_min[nr] = IN_TO_REG(val, nr);
 361         via686a_write_value(client, VIA686A_REG_IN_MIN(nr),
 362                         data->in_min[nr]);
 363         mutex_unlock(&data->update_lock);
 364         return count;
 365 }
 366 static ssize_t set_in_max(struct device *dev, const char *buf,
 367                 size_t count, int nr) {
 368         struct i2c_client *client = to_i2c_client(dev);
 369         struct via686a_data *data = i2c_get_clientdata(client);
 370         unsigned long val = simple_strtoul(buf, NULL, 10);
 371
 372         mutex_lock(&data->update_lock);
 373         data->in_max[nr] = IN_TO_REG(val, nr);
 374         via686a_write_value(client, VIA686A_REG_IN_MAX(nr),
 375                         data->in_max[nr]);
 376         mutex_unlock(&data->update_lock);
 377         return count;
 378 }
 379 #define show_in_offset(offset)                                  \
 380 static ssize_t                                                  \
 381         show_in##offset (struct device *dev, struct device_attribute *attr, char *buf)          \
 382 {                                                               \
 383         return show_in(dev, buf, offset);                       \
 384 }                                                               \
 385 static ssize_t                                                  \
 386         show_in##offset##_min (struct device *dev, struct device_attribute *attr, char *buf)    \
 387 {                                                               \
 388         return show_in_min(dev, buf, offset);           \
 389 }                                                               \
 390 static ssize_t                                                  \
 391         show_in##offset##_max (struct device *dev, struct device_attribute *attr, char *buf)    \
 392 {                                                               \
 393         return show_in_max(dev, buf, offset);           \
 394 }                                                               \
 395 static ssize_t set_in##offset##_min (struct device *dev, struct device_attribute *attr,         \
 396                 const char *buf, size_t count)                  \
 397 {                                                               \
 398         return set_in_min(dev, buf, count, offset);             \
 399 }                                                               \
 400 static ssize_t set_in##offset##_max (struct device *dev, struct device_attribute *attr, \
 401                         const char *buf, size_t count)          \
 402 {                                                               \
 403         return set_in_max(dev, buf, count, offset);             \
 404 }                                                               \
 405 static DEVICE_ATTR(in##offset##_input, S_IRUGO, show_in##offset, NULL);\
 406 static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,         \
 407                 show_in##offset##_min, set_in##offset##_min);   \
 408 static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,         \
 409                 show_in##offset##_max, set_in##offset##_max);
 410
 411 show_in_offset(0);
 412 show_in_offset(1);
 413 show_in_offset(2);
 414 show_in_offset(3);
 415 show_in_offset(4);
 416
 417 /* 3 temperatures */
 418 static ssize_t show_temp(struct device *dev, char *buf, int nr) {
 419         struct via686a_data *data = via686a_update_device(dev);
 420         return sprintf(buf, "%ld\n", TEMP_FROM_REG10(data->temp[nr]));
 421 }
 422 static ssize_t show_temp_over(struct device *dev, char *buf, int nr) {
 423         struct via686a_data *data = via686a_update_device(dev);
 424         return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp_over[nr]));
 425 }
 426 static ssize_t show_temp_hyst(struct device *dev, char *buf, int nr) {
 427         struct via686a_data *data = via686a_update_device(dev);
 428         return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp_hyst[nr]));
 429 }
 430 static ssize_t set_temp_over(struct device *dev, const char *buf,
 431                 size_t count, int nr) {
 432         struct i2c_client *client = to_i2c_client(dev);
 433         struct via686a_data *data = i2c_get_clientdata(client);
 434         int val = simple_strtol(buf, NULL, 10);
 435
 436         mutex_lock(&data->update_lock);
 437         data->temp_over[nr] = TEMP_TO_REG(val);
 438         via686a_write_value(client, VIA686A_REG_TEMP_OVER[nr],
 439                             data->temp_over[nr]);
 440         mutex_unlock(&data->update_lock);
 441         return count;
 442 }
 443 static ssize_t set_temp_hyst(struct device *dev, const char *buf,
 444                 size_t count, int nr) {
 445         struct i2c_client *client = to_i2c_client(dev);
 446         struct via686a_data *data = i2c_get_clientdata(client);
 447         int val = simple_strtol(buf, NULL, 10);
 448
 449         mutex_lock(&data->update_lock);
 450         data->temp_hyst[nr] = TEMP_TO_REG(val);
 451         via686a_write_value(client, VIA686A_REG_TEMP_HYST[nr],
 452                             data->temp_hyst[nr]);
 453         mutex_unlock(&data->update_lock);
 454         return count;
 455 }
 456 #define show_temp_offset(offset)                                        \
 457 static ssize_t show_temp_##offset (struct device *dev, struct device_attribute *attr, char *buf)        \
 458 {                                                                       \
 459         return show_temp(dev, buf, offset - 1);                         \
 460 }                                                                       \
 461 static ssize_t                                                          \
 462 show_temp_##offset##_over (struct device *dev, struct device_attribute *attr, char *buf)                \
 463 {                                                                       \
 464         return show_temp_over(dev, buf, offset - 1);                    \
 465 }                                                                       \
 466 static ssize_t                                                          \
 467 show_temp_##offset##_hyst (struct device *dev, struct device_attribute *attr, char *buf)                \
 468 {                                                                       \
 469         return show_temp_hyst(dev, buf, offset - 1);                    \
 470 }                                                                       \
 471 static ssize_t set_temp_##offset##_over (struct device *dev, struct device_attribute *attr,             \
 472                 const char *buf, size_t count)                          \
 473 {                                                                       \
 474         return set_temp_over(dev, buf, count, offset - 1);              \
 475 }                                                                       \
 476 static ssize_t set_temp_##offset##_hyst (struct device *dev, struct device_attribute *attr,             \
 477                 const char *buf, size_t count)                          \
 478 {                                                                       \
 479         return set_temp_hyst(dev, buf, count, offset - 1);              \
 480 }                                                                       \
 481 static DEVICE_ATTR(temp##offset##_input, S_IRUGO, show_temp_##offset, NULL);\
 482 static DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,               \
 483                 show_temp_##offset##_over, set_temp_##offset##_over);   \
 484 static DEVICE_ATTR(temp##offset##_max_hyst, S_IRUGO | S_IWUSR,          \
 485                 show_temp_##offset##_hyst, set_temp_##offset##_hyst);
 486
 487 show_temp_offset(1);
 488 show_temp_offset(2);
 489 show_temp_offset(3);
 490
 491 /* 2 Fans */
 492 static ssize_t show_fan(struct device *dev, char *buf, int nr) {
 493         struct via686a_data *data = via686a_update_device(dev);
 494         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
 495                                 DIV_FROM_REG(data->fan_div[nr])) );
 496 }
 497 static ssize_t show_fan_min(struct device *dev, char *buf, int nr) {
 498         struct via686a_data *data = via686a_update_device(dev);
 499         return sprintf(buf, "%d\n",
 500                 FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr])) );
 501 }
 502 static ssize_t show_fan_div(struct device *dev, char *buf, int nr) {
 503         struct via686a_data *data = via686a_update_device(dev);
 504         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]) );
 505 }
 506 static ssize_t set_fan_min(struct device *dev, const char *buf,
 507                 size_t count, int nr) {
 508         struct i2c_client *client = to_i2c_client(dev);
 509         struct via686a_data *data = i2c_get_clientdata(client);
 510         int val = simple_strtol(buf, NULL, 10);
 511
 512         mutex_lock(&data->update_lock);
 513         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
 514         via686a_write_value(client, VIA686A_REG_FAN_MIN(nr+1), data->fan_min[nr]);
 515         mutex_unlock(&data->update_lock);
 516         return count;
 517 }
 518 static ssize_t set_fan_div(struct device *dev, const char *buf,
 519                 size_t count, int nr) {
 520         struct i2c_client *client = to_i2c_client(dev);
 521         struct via686a_data *data = i2c_get_clientdata(client);
 522         int val = simple_strtol(buf, NULL, 10);
 523         int old;
 524
 525         mutex_lock(&data->update_lock);
 526         old = via686a_read_value(client, VIA686A_REG_FANDIV);
 527         data->fan_div[nr] = DIV_TO_REG(val);
 528         old = (old & 0x0f) | (data->fan_div[1] << 6) | (data->fan_div[0] << 4);
 529         via686a_write_value(client, VIA686A_REG_FANDIV, old);
 530         mutex_unlock(&data->update_lock);
 531         return count;
 532 }
 533
 534 #define show_fan_offset(offset)                                         \
 535 static ssize_t show_fan_##offset (struct device *dev, struct device_attribute *attr, char *buf) \
 536 {                                                                       \
 537         return show_fan(dev, buf, offset - 1);                          \
 538 }                                                                       \
 539 static ssize_t show_fan_##offset##_min (struct device *dev, struct device_attribute *attr, char *buf)   \
 540 {                                                                       \
 541         return show_fan_min(dev, buf, offset - 1);                      \
 542 }                                                                       \
 543 static ssize_t show_fan_##offset##_div (struct device *dev, struct device_attribute *attr, char *buf)   \
 544 {                                                                       \
 545         return show_fan_div(dev, buf, offset - 1);                      \
 546 }                                                                       \
 547 static ssize_t set_fan_##offset##_min (struct device *dev, struct device_attribute *attr,               \
 548         const char *buf, size_t count)                                  \
 549 {                                                                       \
 550         return set_fan_min(dev, buf, count, offset - 1);                \
 551 }                                                                       \
 552 static ssize_t set_fan_##offset##_div (struct device *dev, struct device_attribute *attr,               \
 553                 const char *buf, size_t count)                          \
 554 {                                                                       \
 555         return set_fan_div(dev, buf, count, offset - 1);                \
 556 }                                                                       \
 557 static DEVICE_ATTR(fan##offset##_input, S_IRUGO, show_fan_##offset, NULL);\
 558 static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR,                \
 559                 show_fan_##offset##_min, set_fan_##offset##_min);       \
 560 static DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR,                \
 561                 show_fan_##offset##_div, set_fan_##offset##_div);
 562
 563 show_fan_offset(1);
 564 show_fan_offset(2);
 565
 566 /* Alarms */
 567 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf) {
 568         struct via686a_data *data = via686a_update_device(dev);
 569         return sprintf(buf, "%u\n", data->alarms);
 570 }
 571 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 572
 573 /* The driver. I choose to use type i2c_driver, as at is identical to both
 574    smbus_driver and isa_driver, and clients could be of either kind */
 575 static struct i2c_driver via686a_driver = {
 576         .driver = {
 577                 .name   = "via686a",
 578         },
 579         .attach_adapter = via686a_detect,
 580         .detach_client  = via686a_detach_client,
 581 };
 582
 583
 584 /* This is called when the module is loaded */
 585 static int via686a_detect(struct i2c_adapter *adapter)
 586 {
 587         struct i2c_client *new_client;
 588         struct via686a_data *data;
 589         int err = 0;
 590         const char client_name[] = "via686a";
 591         u16 val;
 592
 593         /* 8231 requires multiple of 256, we enforce that on 686 as well */
 594         if (force_addr) {
 595                 address = force_addr & 0xFF00;
 596                 dev_warn(&adapter->dev, "forcing ISA address 0x%04X\n",
 597                          address);
 598                 if (PCIBIOS_SUCCESSFUL !=
 599                     pci_write_config_word(s_bridge, VIA686A_BASE_REG, address))
 600                         return -ENODEV;
 601         }
 602         if (PCIBIOS_SUCCESSFUL !=
 603             pci_read_config_word(s_bridge, VIA686A_ENABLE_REG, &val))
 604                 return -ENODEV;
 605         if (!(val & 0x0001)) {
 606                 if (force_addr) {
 607                         dev_info(&adapter->dev, "enabling sensors\n");
 608                         if (PCIBIOS_SUCCESSFUL !=
 609                             pci_write_config_word(s_bridge, VIA686A_ENABLE_REG,
 610                                                   val | 0x0001))
 611                                 return -ENODEV;
 612                 } else {
 613                         dev_warn(&adapter->dev, "sensors disabled - enable "
 614                                  "with force_addr=0x%x\n", address);
 615                         return -ENODEV;
 616                 }
 617         }
 618
 619         /* Reserve the ISA region */
 620         if (!request_region(address, VIA686A_EXTENT,
 621                             via686a_driver.driver.name)) {
 622                 dev_err(&adapter->dev, "region 0x%x already in use!\n",
 623                         address);
 624                 return -ENODEV;
 625         }
 626
 627         if (!(data = kzalloc(sizeof(struct via686a_data), GFP_KERNEL))) {
 628                 err = -ENOMEM;
 629                 goto exit_release;
 630         }
 631
 632         new_client = &data->client;
 633         i2c_set_clientdata(new_client, data);
 634         new_client->addr = address;
 635         new_client->adapter = adapter;
 636         new_client->driver = &via686a_driver;
 637         new_client->flags = 0;
 638
 639         /* Fill in the remaining client fields and put into the global list */
 640         strlcpy(new_client->name, client_name, I2C_NAME_SIZE);
 641
 642         data->valid = 0;
 643         mutex_init(&data->update_lock);
 644         /* Tell the I2C layer a new client has arrived */
 645         if ((err = i2c_attach_client(new_client)))
 646                 goto exit_free;
 647
 648         /* Initialize the VIA686A chip */
 649         via686a_init_client(new_client);
 650
 651         /* Register sysfs hooks */
 652         data->class_dev = hwmon_device_register(&new_client->dev);
 653         if (IS_ERR(data->class_dev)) {
 654                 err = PTR_ERR(data->class_dev);
 655                 goto exit_detach;
 656         }
 657
 658         device_create_file(&new_client->dev, &dev_attr_in0_input);
 659         device_create_file(&new_client->dev, &dev_attr_in1_input);
 660         device_create_file(&new_client->dev, &dev_attr_in2_input);
 661         device_create_file(&new_client->dev, &dev_attr_in3_input);
 662         device_create_file(&new_client->dev, &dev_attr_in4_input);
 663         device_create_file(&new_client->dev, &dev_attr_in0_min);
 664         device_create_file(&new_client->dev, &dev_attr_in1_min);
 665         device_create_file(&new_client->dev, &dev_attr_in2_min);
 666         device_create_file(&new_client->dev, &dev_attr_in3_min);
 667         device_create_file(&new_client->dev, &dev_attr_in4_min);
 668         device_create_file(&new_client->dev, &dev_attr_in0_max);
 669         device_create_file(&new_client->dev, &dev_attr_in1_max);
 670         device_create_file(&new_client->dev, &dev_attr_in2_max);
 671         device_create_file(&new_client->dev, &dev_attr_in3_max);
 672         device_create_file(&new_client->dev, &dev_attr_in4_max);
 673         device_create_file(&new_client->dev, &dev_attr_temp1_input);
 674         device_create_file(&new_client->dev, &dev_attr_temp2_input);
 675         device_create_file(&new_client->dev, &dev_attr_temp3_input);
 676         device_create_file(&new_client->dev, &dev_attr_temp1_max);
 677         device_create_file(&new_client->dev, &dev_attr_temp2_max);
 678         device_create_file(&new_client->dev, &dev_attr_temp3_max);
 679         device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst);
 680         device_create_file(&new_client->dev, &dev_attr_temp2_max_hyst);
 681         device_create_file(&new_client->dev, &dev_attr_temp3_max_hyst);
 682         device_create_file(&new_client->dev, &dev_attr_fan1_input);
 683         device_create_file(&new_client->dev, &dev_attr_fan2_input);
 684         device_create_file(&new_client->dev, &dev_attr_fan1_min);
 685         device_create_file(&new_client->dev, &dev_attr_fan2_min);
 686         device_create_file(&new_client->dev, &dev_attr_fan1_div);
 687         device_create_file(&new_client->dev, &dev_attr_fan2_div);
 688         device_create_file(&new_client->dev, &dev_attr_alarms);
 689
 690         return 0;
 691
 692 exit_detach:
 693         i2c_detach_client(new_client);
 694 exit_free:
 695         kfree(data);
 696 exit_release:
 697         release_region(address, VIA686A_EXTENT);
 698         return err;
 699 }
 700
 701 static int via686a_detach_client(struct i2c_client *client)
 702 {
 703         struct via686a_data *data = i2c_get_clientdata(client);
 704         int err;
 705
 706         hwmon_device_unregister(data->class_dev);
 707
 708         if ((err = i2c_detach_client(client)))
 709                 return err;
 710
 711         release_region(client->addr, VIA686A_EXTENT);
 712         kfree(data);
 713
 714         return 0;
 715 }
 716
 717 static void via686a_init_client(struct i2c_client *client)
 718 {
 719         u8 reg;
 720
 721         /* Start monitoring */
 722         reg = via686a_read_value(client, VIA686A_REG_CONFIG);
 723         via686a_write_value(client, VIA686A_REG_CONFIG, (reg|0x01)&0x7F);
 724
 725         /* Configure temp interrupt mode for continuous-interrupt operation */
 726         via686a_write_value(client, VIA686A_REG_TEMP_MODE,
 727                             via686a_read_value(client, VIA686A_REG_TEMP_MODE) &
 728                             !(VIA686A_TEMP_MODE_MASK | VIA686A_TEMP_MODE_CONTINUOUS));
 729 }
 730
 731 static struct via686a_data *via686a_update_device(struct device *dev)
 732 {
 733         struct i2c_client *client = to_i2c_client(dev);
 734         struct via686a_data *data = i2c_get_clientdata(client);
 735         int i;
 736
 737         mutex_lock(&data->update_lock);
 738
 739         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 740             || !data->valid) {
 741                 for (i = 0; i <= 4; i++) {
 742                         data->in[i] =
 743                             via686a_read_value(client, VIA686A_REG_IN(i));
 744                         data->in_min[i] = via686a_read_value(client,
 745                                                              VIA686A_REG_IN_MIN
 746                                                              (i));
 747                         data->in_max[i] =
 748                             via686a_read_value(client, VIA686A_REG_IN_MAX(i));
 749                 }
 750                 for (i = 1; i <= 2; i++) {
 751                         data->fan[i - 1] =
 752                             via686a_read_value(client, VIA686A_REG_FAN(i));
 753                         data->fan_min[i - 1] = via686a_read_value(client,
 754                                                      VIA686A_REG_FAN_MIN(i));
 755                 }
 756                 for (i = 0; i <= 2; i++) {
 757                         data->temp[i] = via686a_read_value(client,
 758                                                  VIA686A_REG_TEMP[i]) << 2;
 759                         data->temp_over[i] =
 760                             via686a_read_value(client,
 761                                                VIA686A_REG_TEMP_OVER[i]);
 762                         data->temp_hyst[i] =
 763                             via686a_read_value(client,
 764                                                VIA686A_REG_TEMP_HYST[i]);
 765                 }
 766                 /* add in lower 2 bits
 767                    temp1 uses bits 7-6 of VIA686A_REG_TEMP_LOW1
 768                    temp2 uses bits 5-4 of VIA686A_REG_TEMP_LOW23
 769                    temp3 uses bits 7-6 of VIA686A_REG_TEMP_LOW23
 770                  */
 771                 data->temp[0] |= (via686a_read_value(client,
 772                                                      VIA686A_REG_TEMP_LOW1)
 773                                   & 0xc0) >> 6;
 774                 data->temp[1] |=
 775                     (via686a_read_value(client, VIA686A_REG_TEMP_LOW23) &
 776                      0x30) >> 4;
 777                 data->temp[2] |=
 778                     (via686a_read_value(client, VIA686A_REG_TEMP_LOW23) &
 779                      0xc0) >> 6;
 780
 781                 i = via686a_read_value(client, VIA686A_REG_FANDIV);
 782                 data->fan_div[0] = (i >> 4) & 0x03;
 783                 data->fan_div[1] = i >> 6;
 784                 data->alarms =
 785                     via686a_read_value(client,
 786                                        VIA686A_REG_ALARM1) |
 787                     (via686a_read_value(client, VIA686A_REG_ALARM2) << 8);
 788                 data->last_updated = jiffies;
 789                 data->valid = 1;
 790         }
 791
 792         mutex_unlock(&data->update_lock);
 793
 794         return data;
 795 }
 796
 797 static struct pci_device_id via686a_pci_ids[] = {
 798         { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_4) },
 799         { 0, }
 800 };
 801
 802 MODULE_DEVICE_TABLE(pci, via686a_pci_ids);
 803
 804 static int __devinit via686a_pci_probe(struct pci_dev *dev,
 805                                        const struct pci_device_id *id)
 806 {
 807         u16 val;
 808
 809         if (PCIBIOS_SUCCESSFUL !=
 810             pci_read_config_word(dev, VIA686A_BASE_REG, &val))
 811                 return -ENODEV;
 812
 813         address = val & ~(VIA686A_EXTENT - 1);
 814         if (address == 0 && force_addr == 0) {
 815                 dev_err(&dev->dev, "base address not set - upgrade BIOS "
 816                         "or use force_addr=0xaddr\n");
 817                 return -ENODEV;
 818         }
 819
 820         s_bridge = pci_dev_get(dev);
 821         if (i2c_isa_add_driver(&via686a_driver)) {
 822                 pci_dev_put(s_bridge);
 823                 s_bridge = NULL;
 824         }
 825
 826         /* Always return failure here.  This is to allow other drivers to bind
 827          * to this pci device.  We don't really want to have control over the
 828          * pci device, we only wanted to read as few register values from it.
 829          */
 830         return -ENODEV;
 831 }
 832
 833 static struct pci_driver via686a_pci_driver = {
 834         .name           = "via686a",
 835         .id_table       = via686a_pci_ids,
 836         .probe          = via686a_pci_probe,
 837 };
 838
 839 static int __init sm_via686a_init(void)
 840 {
 841         return pci_register_driver(&via686a_pci_driver);
 842 }
 843
 844 static void __exit sm_via686a_exit(void)
 845 {
 846         pci_unregister_driver(&via686a_pci_driver);
 847         if (s_bridge != NULL) {
 848                 i2c_isa_del_driver(&via686a_driver);
 849                 pci_dev_put(s_bridge);
 850                 s_bridge = NULL;
 851         }
 852 }
 853
 854 MODULE_AUTHOR("Kyösti Mälkki <kmalkki@cc.hut.fi>, "
 855               "Mark Studebaker <mdsxyz123@yahoo.com> "
 856               "and Bob Dougherty <bobd@stanford.edu>");
 857 MODULE_DESCRIPTION("VIA 686A Sensor device");
 858 MODULE_LICENSE("GPL");
 859
 860 module_init(sm_via686a_init);
 861 module_exit(sm_via686a_exit);