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 <linux/sysfs.h>
  44 #include <asm/io.h>
  45
  46
  47 /* If force_addr is set to anything different from 0, we forcibly enable
  48    the device at the given address. */
  49 static unsigned short force_addr;
  50 module_param(force_addr, ushort, 0);
  51 MODULE_PARM_DESC(force_addr,
  52                  "Initialize the base address of the sensors");
  53
  54 /* Device address
  55    Note that we can't determine the ISA address until we have initialized
  56    our module */
  57 static unsigned short address;
  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 s16 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)      ((long)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 each registered chip, we need to keep some data in memory.
 296    The structure is dynamically 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 static struct attribute *via686a_attributes[] = {
 574         &dev_attr_in0_input.attr,
 575         &dev_attr_in1_input.attr,
 576         &dev_attr_in2_input.attr,
 577         &dev_attr_in3_input.attr,
 578         &dev_attr_in4_input.attr,
 579         &dev_attr_in0_min.attr,
 580         &dev_attr_in1_min.attr,
 581         &dev_attr_in2_min.attr,
 582         &dev_attr_in3_min.attr,
 583         &dev_attr_in4_min.attr,
 584         &dev_attr_in0_max.attr,
 585         &dev_attr_in1_max.attr,
 586         &dev_attr_in2_max.attr,
 587         &dev_attr_in3_max.attr,
 588         &dev_attr_in4_max.attr,
 589
 590         &dev_attr_temp1_input.attr,
 591         &dev_attr_temp2_input.attr,
 592         &dev_attr_temp3_input.attr,
 593         &dev_attr_temp1_max.attr,
 594         &dev_attr_temp2_max.attr,
 595         &dev_attr_temp3_max.attr,
 596         &dev_attr_temp1_max_hyst.attr,
 597         &dev_attr_temp2_max_hyst.attr,
 598         &dev_attr_temp3_max_hyst.attr,
 599
 600         &dev_attr_fan1_input.attr,
 601         &dev_attr_fan2_input.attr,
 602         &dev_attr_fan1_min.attr,
 603         &dev_attr_fan2_min.attr,
 604         &dev_attr_fan1_div.attr,
 605         &dev_attr_fan2_div.attr,
 606
 607         &dev_attr_alarms.attr,
 608         NULL
 609 };
 610
 611 static const struct attribute_group via686a_group = {
 612         .attrs = via686a_attributes,
 613 };
 614
 615 /* The driver. I choose to use type i2c_driver, as at is identical to both
 616    smbus_driver and isa_driver, and clients could be of either kind */
 617 static struct i2c_driver via686a_driver = {
 618         .driver = {
 619                 .owner  = THIS_MODULE,
 620                 .name   = "via686a",
 621         },
 622         .attach_adapter = via686a_detect,
 623         .detach_client  = via686a_detach_client,
 624 };
 625
 626
 627 /* This is called when the module is loaded */
 628 static int via686a_detect(struct i2c_adapter *adapter)
 629 {
 630         struct i2c_client *new_client;
 631         struct via686a_data *data;
 632         int err = 0;
 633         const char client_name[] = "via686a";
 634         u16 val;
 635
 636         /* 8231 requires multiple of 256, we enforce that on 686 as well */
 637         if (force_addr) {
 638                 address = force_addr & 0xFF00;
 639                 dev_warn(&adapter->dev, "forcing ISA address 0x%04X\n",
 640                          address);
 641                 if (PCIBIOS_SUCCESSFUL !=
 642                     pci_write_config_word(s_bridge, VIA686A_BASE_REG, address))
 643                         return -ENODEV;
 644         }
 645         if (PCIBIOS_SUCCESSFUL !=
 646             pci_read_config_word(s_bridge, VIA686A_ENABLE_REG, &val))
 647                 return -ENODEV;
 648         if (!(val & 0x0001)) {
 649                 if (force_addr) {
 650                         dev_info(&adapter->dev, "enabling sensors\n");
 651                         if (PCIBIOS_SUCCESSFUL !=
 652                             pci_write_config_word(s_bridge, VIA686A_ENABLE_REG,
 653                                                   val | 0x0001))
 654                                 return -ENODEV;
 655                 } else {
 656                         dev_warn(&adapter->dev, "sensors disabled - enable "
 657                                  "with force_addr=0x%x\n", address);
 658                         return -ENODEV;
 659                 }
 660         }
 661
 662         /* Reserve the ISA region */
 663         if (!request_region(address, VIA686A_EXTENT,
 664                             via686a_driver.driver.name)) {
 665                 dev_err(&adapter->dev, "region 0x%x already in use!\n",
 666                         address);
 667                 return -ENODEV;
 668         }
 669
 670         if (!(data = kzalloc(sizeof(struct via686a_data), GFP_KERNEL))) {
 671                 err = -ENOMEM;
 672                 goto exit_release;
 673         }
 674
 675         new_client = &data->client;
 676         i2c_set_clientdata(new_client, data);
 677         new_client->addr = address;
 678         new_client->adapter = adapter;
 679         new_client->driver = &via686a_driver;
 680         new_client->flags = 0;
 681
 682         /* Fill in the remaining client fields and put into the global list */
 683         strlcpy(new_client->name, client_name, I2C_NAME_SIZE);
 684
 685         data->valid = 0;
 686         mutex_init(&data->update_lock);
 687         /* Tell the I2C layer a new client has arrived */
 688         if ((err = i2c_attach_client(new_client)))
 689                 goto exit_free;
 690
 691         /* Initialize the VIA686A chip */
 692         via686a_init_client(new_client);
 693
 694         /* Register sysfs hooks */
 695         if ((err = sysfs_create_group(&new_client->dev.kobj, &via686a_group)))
 696                 goto exit_detach;
 697
 698         data->class_dev = hwmon_device_register(&new_client->dev);
 699         if (IS_ERR(data->class_dev)) {
 700                 err = PTR_ERR(data->class_dev);
 701                 goto exit_remove_files;
 702         }
 703
 704         return 0;
 705
 706 exit_remove_files:
 707         sysfs_remove_group(&new_client->dev.kobj, &via686a_group);
 708 exit_detach:
 709         i2c_detach_client(new_client);
 710 exit_free:
 711         kfree(data);
 712 exit_release:
 713         release_region(address, VIA686A_EXTENT);
 714         return err;
 715 }
 716
 717 static int via686a_detach_client(struct i2c_client *client)
 718 {
 719         struct via686a_data *data = i2c_get_clientdata(client);
 720         int err;
 721
 722         hwmon_device_unregister(data->class_dev);
 723         sysfs_remove_group(&client->dev.kobj, &via686a_group);
 724
 725         if ((err = i2c_detach_client(client)))
 726                 return err;
 727
 728         release_region(client->addr, VIA686A_EXTENT);
 729         kfree(data);
 730
 731         return 0;
 732 }
 733
 734 static void via686a_init_client(struct i2c_client *client)
 735 {
 736         u8 reg;
 737
 738         /* Start monitoring */
 739         reg = via686a_read_value(client, VIA686A_REG_CONFIG);
 740         via686a_write_value(client, VIA686A_REG_CONFIG, (reg|0x01)&0x7F);
 741
 742         /* Configure temp interrupt mode for continuous-interrupt operation */
 743         via686a_write_value(client, VIA686A_REG_TEMP_MODE,
 744                             via686a_read_value(client, VIA686A_REG_TEMP_MODE) &
 745                             !(VIA686A_TEMP_MODE_MASK | VIA686A_TEMP_MODE_CONTINUOUS));
 746 }
 747
 748 static struct via686a_data *via686a_update_device(struct device *dev)
 749 {
 750         struct i2c_client *client = to_i2c_client(dev);
 751         struct via686a_data *data = i2c_get_clientdata(client);
 752         int i;
 753
 754         mutex_lock(&data->update_lock);
 755
 756         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 757             || !data->valid) {
 758                 for (i = 0; i <= 4; i++) {
 759                         data->in[i] =
 760                             via686a_read_value(client, VIA686A_REG_IN(i));
 761                         data->in_min[i] = via686a_read_value(client,
 762                                                              VIA686A_REG_IN_MIN
 763                                                              (i));
 764                         data->in_max[i] =
 765                             via686a_read_value(client, VIA686A_REG_IN_MAX(i));
 766                 }
 767                 for (i = 1; i <= 2; i++) {
 768                         data->fan[i - 1] =
 769                             via686a_read_value(client, VIA686A_REG_FAN(i));
 770                         data->fan_min[i - 1] = via686a_read_value(client,
 771                                                      VIA686A_REG_FAN_MIN(i));
 772                 }
 773                 for (i = 0; i <= 2; i++) {
 774                         data->temp[i] = via686a_read_value(client,
 775                                                  VIA686A_REG_TEMP[i]) << 2;
 776                         data->temp_over[i] =
 777                             via686a_read_value(client,
 778                                                VIA686A_REG_TEMP_OVER[i]);
 779                         data->temp_hyst[i] =
 780                             via686a_read_value(client,
 781                                                VIA686A_REG_TEMP_HYST[i]);
 782                 }
 783                 /* add in lower 2 bits
 784                    temp1 uses bits 7-6 of VIA686A_REG_TEMP_LOW1
 785                    temp2 uses bits 5-4 of VIA686A_REG_TEMP_LOW23
 786                    temp3 uses bits 7-6 of VIA686A_REG_TEMP_LOW23
 787                  */
 788                 data->temp[0] |= (via686a_read_value(client,
 789                                                      VIA686A_REG_TEMP_LOW1)
 790                                   & 0xc0) >> 6;
 791                 data->temp[1] |=
 792                     (via686a_read_value(client, VIA686A_REG_TEMP_LOW23) &
 793                      0x30) >> 4;
 794                 data->temp[2] |=
 795                     (via686a_read_value(client, VIA686A_REG_TEMP_LOW23) &
 796                      0xc0) >> 6;
 797
 798                 i = via686a_read_value(client, VIA686A_REG_FANDIV);
 799                 data->fan_div[0] = (i >> 4) & 0x03;
 800                 data->fan_div[1] = i >> 6;
 801                 data->alarms =
 802                     via686a_read_value(client,
 803                                        VIA686A_REG_ALARM1) |
 804                     (via686a_read_value(client, VIA686A_REG_ALARM2) << 8);
 805                 data->last_updated = jiffies;
 806                 data->valid = 1;
 807         }
 808
 809         mutex_unlock(&data->update_lock);
 810
 811         return data;
 812 }
 813
 814 static struct pci_device_id via686a_pci_ids[] = {
 815         { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_4) },
 816         { 0, }
 817 };
 818
 819 MODULE_DEVICE_TABLE(pci, via686a_pci_ids);
 820
 821 static int __devinit via686a_pci_probe(struct pci_dev *dev,
 822                                        const struct pci_device_id *id)
 823 {
 824         u16 val;
 825
 826         if (PCIBIOS_SUCCESSFUL !=
 827             pci_read_config_word(dev, VIA686A_BASE_REG, &val))
 828                 return -ENODEV;
 829
 830         address = val & ~(VIA686A_EXTENT - 1);
 831         if (address == 0 && force_addr == 0) {
 832                 dev_err(&dev->dev, "base address not set - upgrade BIOS "
 833                         "or use force_addr=0xaddr\n");
 834                 return -ENODEV;
 835         }
 836
 837         s_bridge = pci_dev_get(dev);
 838         if (i2c_isa_add_driver(&via686a_driver)) {
 839                 pci_dev_put(s_bridge);
 840                 s_bridge = NULL;
 841         }
 842
 843         /* Always return failure here.  This is to allow other drivers to bind
 844          * to this pci device.  We don't really want to have control over the
 845          * pci device, we only wanted to read as few register values from it.
 846          */
 847         return -ENODEV;
 848 }
 849
 850 static struct pci_driver via686a_pci_driver = {
 851         .name           = "via686a",
 852         .id_table       = via686a_pci_ids,
 853         .probe          = via686a_pci_probe,
 854 };
 855
 856 static int __init sm_via686a_init(void)
 857 {
 858         return pci_register_driver(&via686a_pci_driver);
 859 }
 860
 861 static void __exit sm_via686a_exit(void)
 862 {
 863         pci_unregister_driver(&via686a_pci_driver);
 864         if (s_bridge != NULL) {
 865                 i2c_isa_del_driver(&via686a_driver);
 866                 pci_dev_put(s_bridge);
 867                 s_bridge = NULL;
 868         }
 869 }
 870
 871 MODULE_AUTHOR("Kyösti Mälkki <kmalkki@cc.hut.fi>, "
 872               "Mark Studebaker <mdsxyz123@yahoo.com> "
 873               "and Bob Dougherty <bobd@stanford.edu>");
 874 MODULE_DESCRIPTION("VIA 686A Sensor device");
 875 MODULE_LICENSE("GPL");
 876
 877 module_init(sm_via686a_init);
 878 module_exit(sm_via686a_exit);