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 * 10 * (Some conversion-factor data were contributed by Jonathan Teh Soon Yew 11 * <j.teh@iname.com> and Alex van Kaam <darkside@chello.nl>.) 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License as published by 15 * the Free Software Foundation; either version 2 of the License, or 16 * (at your option) any later version. 17 * 18 * This program is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 * GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with this program; if not, write to the Free Software 25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 26 */ 27 28/* 29 * Supports the Via VT82C686A, VT82C686B south bridges. 30 * Reports all as a 686A. 31 * Warning - only supports a single device. 32 */ 33 34#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 35 36#include <linux/module.h> 37#include <linux/slab.h> 38#include <linux/pci.h> 39#include <linux/jiffies.h> 40#include <linux/platform_device.h> 41#include <linux/hwmon.h> 42#include <linux/hwmon-sysfs.h> 43#include <linux/err.h> 44#include <linux/init.h> 45#include <linux/mutex.h> 46#include <linux/sysfs.h> 47#include <linux/acpi.h> 48#include <linux/io.h> 49 50 51/* 52 * If force_addr is set to anything different from 0, we forcibly enable 53 * the device at the given address. 54 */ 55static unsigned short force_addr; 56module_param(force_addr, ushort, 0); 57MODULE_PARM_DESC(force_addr, 58 "Initialize the base address of the sensors"); 59 60static struct platform_device *pdev; 61 62/* 63 * The Via 686a southbridge has a LM78-like chip integrated on the same IC. 64 * This driver is a customized copy of lm78.c 65 */ 66 67/* Many VIA686A constants specified below */ 68 69/* Length of ISA address segment */ 70#define VIA686A_EXTENT 0x80 71#define VIA686A_BASE_REG 0x70 72#define VIA686A_ENABLE_REG 0x74 73 74/* The VIA686A registers */ 75/* ins numbered 0-4 */ 76#define VIA686A_REG_IN_MAX(nr) (0x2b + ((nr) * 2)) 77#define VIA686A_REG_IN_MIN(nr) (0x2c + ((nr) * 2)) 78#define VIA686A_REG_IN(nr) (0x22 + (nr)) 79 80/* fans numbered 1-2 */ 81#define VIA686A_REG_FAN_MIN(nr) (0x3a + (nr)) 82#define VIA686A_REG_FAN(nr) (0x28 + (nr)) 83 84/* temps numbered 1-3 */ 85static const u8 VIA686A_REG_TEMP[] = { 0x20, 0x21, 0x1f }; 86static const u8 VIA686A_REG_TEMP_OVER[] = { 0x39, 0x3d, 0x1d }; 87static const u8 VIA686A_REG_TEMP_HYST[] = { 0x3a, 0x3e, 0x1e }; 88/* bits 7-6 */ 89#define VIA686A_REG_TEMP_LOW1 0x4b 90/* 2 = bits 5-4, 3 = bits 7-6 */ 91#define VIA686A_REG_TEMP_LOW23 0x49 92 93#define VIA686A_REG_ALARM1 0x41 94#define VIA686A_REG_ALARM2 0x42 95#define VIA686A_REG_FANDIV 0x47 96#define VIA686A_REG_CONFIG 0x40 97/* 98 * The following register sets temp interrupt mode (bits 1-0 for temp1, 99 * 3-2 for temp2, 5-4 for temp3). Modes are: 100 * 00 interrupt stays as long as value is out-of-range 101 * 01 interrupt is cleared once register is read (default) 102 * 10 comparator mode- like 00, but ignores hysteresis 103 * 11 same as 00 104 */ 105#define VIA686A_REG_TEMP_MODE 0x4b 106/* We'll just assume that you want to set all 3 simultaneously: */ 107#define VIA686A_TEMP_MODE_MASK 0x3F 108#define VIA686A_TEMP_MODE_CONTINUOUS 0x00 109 110/* 111 * Conversions. Limit checking is only done on the TO_REG 112 * variants. 113 * 114 ******** VOLTAGE CONVERSIONS (Bob Dougherty) ******** 115 * From HWMon.cpp (Copyright 1998-2000 Jonathan Teh Soon Yew): 116 * voltagefactor[0]=1.25/2628; (2628/1.25=2102.4) // Vccp 117 * voltagefactor[1]=1.25/2628; (2628/1.25=2102.4) // +2.5V 118 * voltagefactor[2]=1.67/2628; (2628/1.67=1573.7) // +3.3V 119 * voltagefactor[3]=2.6/2628; (2628/2.60=1010.8) // +5V 120 * voltagefactor[4]=6.3/2628; (2628/6.30=417.14) // +12V 121 * in[i]=(data[i+2]*25.0+133)*voltagefactor[i]; 122 * That is: 123 * volts = (25*regVal+133)*factor 124 * regVal = (volts/factor-133)/25 125 * (These conversions were contributed by Jonathan Teh Soon Yew 126 * <j.teh@iname.com>) 127 */ 128static inline u8 IN_TO_REG(long val, int in_num) 129{ 130 /* 131 * To avoid floating point, we multiply constants by 10 (100 for +12V). 132 * Rounding is done (120500 is actually 133000 - 12500). 133 * Remember that val is expressed in 0.001V/bit, which is why we divide 134 * by an additional 10000 (100000 for +12V): 1000 for val and 10 (100) 135 * for the constants. 136 */ 137 if (in_num <= 1) 138 return (u8) clamp_val((val * 21024 - 1205000) / 250000, 0, 255); 139 else if (in_num == 2) 140 return (u8) clamp_val((val * 15737 - 1205000) / 250000, 0, 255); 141 else if (in_num == 3) 142 return (u8) clamp_val((val * 10108 - 1205000) / 250000, 0, 255); 143 else 144 return (u8) clamp_val((val * 41714 - 12050000) / 2500000, 0, 145 255); 146} 147 148static inline long IN_FROM_REG(u8 val, int in_num) 149{ 150 /* 151 * To avoid floating point, we multiply constants by 10 (100 for +12V). 152 * We also multiply them by 1000 because we want 0.001V/bit for the 153 * output value. Rounding is done. 154 */ 155 if (in_num <= 1) 156 return (long) ((250000 * val + 1330000 + 21024 / 2) / 21024); 157 else if (in_num == 2) 158 return (long) ((250000 * val + 1330000 + 15737 / 2) / 15737); 159 else if (in_num == 3) 160 return (long) ((250000 * val + 1330000 + 10108 / 2) / 10108); 161 else 162 return (long) ((2500000 * val + 13300000 + 41714 / 2) / 41714); 163} 164 165/********* FAN RPM CONVERSIONS ********/ 166/* 167 * Higher register values = slower fans (the fan's strobe gates a counter). 168 * But this chip saturates back at 0, not at 255 like all the other chips. 169 * So, 0 means 0 RPM 170 */ 171static inline u8 FAN_TO_REG(long rpm, int div) 172{ 173 if (rpm == 0) 174 return 0; 175 rpm = clamp_val(rpm, 1, 1000000); 176 return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 255); 177} 178 179#define FAN_FROM_REG(val, div) ((val) == 0 ? 0 : (val) == 255 ? 0 : 1350000 / \ 180 ((val) * (div))) 181 182/******** TEMP CONVERSIONS (Bob Dougherty) *********/ 183/* 184 * linear fits from HWMon.cpp (Copyright 1998-2000 Jonathan Teh Soon Yew) 185 * if(temp<169) 186 * return double(temp)*0.427-32.08; 187 * else if(temp>=169 && temp<=202) 188 * return double(temp)*0.582-58.16; 189 * else 190 * return double(temp)*0.924-127.33; 191 * 192 * A fifth-order polynomial fits the unofficial data (provided by Alex van 193 * Kaam <darkside@chello.nl>) a bit better. It also give more reasonable 194 * numbers on my machine (ie. they agree with what my BIOS tells me). 195 * Here's the fifth-order fit to the 8-bit data: 196 * temp = 1.625093e-10*val^5 - 1.001632e-07*val^4 + 2.457653e-05*val^3 - 197 * 2.967619e-03*val^2 + 2.175144e-01*val - 7.090067e+0. 198 * 199 * (2000-10-25- RFD: thanks to Uwe Andersen <uandersen@mayah.com> for 200 * finding my typos in this formula!) 201 * 202 * Alas, none of the elegant function-fit solutions will work because we 203 * aren't allowed to use floating point in the kernel and doing it with 204 * integers doesn't provide enough precision. So we'll do boring old 205 * look-up table stuff. The unofficial data (see below) have effectively 206 * 7-bit resolution (they are rounded to the nearest degree). I'm assuming 207 * that the transfer function of the device is monotonic and smooth, so a 208 * smooth function fit to the data will allow us to get better precision. 209 * I used the 5th-order poly fit described above and solved for 210 * VIA register values 0-255. I *10 before rounding, so we get tenth-degree 211 * precision. (I could have done all 1024 values for our 10-bit readings, 212 * but the function is very linear in the useful range (0-80 deg C), so 213 * we'll just use linear interpolation for 10-bit readings.) So, temp_lut 214 * is the temp at via register values 0-255: 215 */ 216static const s16 temp_lut[] = { 217 -709, -688, -667, -646, -627, -607, -589, -570, -553, -536, -519, 218 -503, -487, -471, -456, -442, -428, -414, -400, -387, -375, 219 -362, -350, -339, -327, -316, -305, -295, -285, -275, -265, 220 -255, -246, -237, -229, -220, -212, -204, -196, -188, -180, 221 -173, -166, -159, -152, -145, -139, -132, -126, -120, -114, 222 -108, -102, -96, -91, -85, -80, -74, -69, -64, -59, -54, -49, 223 -44, -39, -34, -29, -25, -20, -15, -11, -6, -2, 3, 7, 12, 16, 224 20, 25, 29, 33, 37, 42, 46, 50, 54, 59, 63, 67, 71, 75, 79, 84, 225 88, 92, 96, 100, 104, 109, 113, 117, 121, 125, 130, 134, 138, 226 142, 146, 151, 155, 159, 163, 168, 172, 176, 181, 185, 189, 227 193, 198, 202, 206, 211, 215, 219, 224, 228, 232, 237, 241, 228 245, 250, 254, 259, 263, 267, 272, 276, 281, 285, 290, 294, 229 299, 303, 307, 312, 316, 321, 325, 330, 334, 339, 344, 348, 230 353, 357, 362, 366, 371, 376, 380, 385, 390, 395, 399, 404, 231 409, 414, 419, 423, 428, 433, 438, 443, 449, 454, 459, 464, 232 469, 475, 480, 486, 491, 497, 502, 508, 514, 520, 526, 532, 233 538, 544, 551, 557, 564, 571, 578, 584, 592, 599, 606, 614, 234 621, 629, 637, 645, 654, 662, 671, 680, 689, 698, 708, 718, 235 728, 738, 749, 759, 770, 782, 793, 805, 818, 830, 843, 856, 236 870, 883, 898, 912, 927, 943, 958, 975, 991, 1008, 1026, 1044, 237 1062, 1081, 1101, 1121, 1141, 1162, 1184, 1206, 1229, 1252, 238 1276, 1301, 1326, 1352, 1378, 1406, 1434, 1462 239}; 240 241/* 242 * the original LUT values from Alex van Kaam <darkside@chello.nl> 243 * (for via register values 12-240): 244 * {-50,-49,-47,-45,-43,-41,-39,-38,-37,-35,-34,-33,-32,-31, 245 * -30,-29,-28,-27,-26,-25,-24,-24,-23,-22,-21,-20,-20,-19,-18,-17,-17,-16,-15, 246 * -15,-14,-14,-13,-12,-12,-11,-11,-10,-9,-9,-8,-8,-7,-7,-6,-6,-5,-5,-4,-4,-3, 247 * -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, 248 * 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, 249 * 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, 250 * 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, 251 * 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, 252 * 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, 253 * 85,86,88,89,91,92,94,96,97,99,101,103,105,107,109,110}; 254 * 255 * 256 * Here's the reverse LUT. I got it by doing a 6-th order poly fit (needed 257 * an extra term for a good fit to these inverse data!) and then 258 * solving for each temp value from -50 to 110 (the useable range for 259 * this chip). Here's the fit: 260 * viaRegVal = -1.160370e-10*val^6 +3.193693e-08*val^5 - 1.464447e-06*val^4 261 * - 2.525453e-04*val^3 + 1.424593e-02*val^2 + 2.148941e+00*val +7.275808e+01) 262 * Note that n=161: 263 */ 264static const u8 via_lut[] = { 265 12, 12, 13, 14, 14, 15, 16, 16, 17, 18, 18, 19, 20, 20, 21, 22, 23, 266 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 35, 36, 37, 39, 40, 267 41, 43, 45, 46, 48, 49, 51, 53, 55, 57, 59, 60, 62, 64, 66, 268 69, 71, 73, 75, 77, 79, 82, 84, 86, 88, 91, 93, 95, 98, 100, 269 103, 105, 107, 110, 112, 115, 117, 119, 122, 124, 126, 129, 270 131, 134, 136, 138, 140, 143, 145, 147, 150, 152, 154, 156, 271 158, 160, 162, 164, 166, 168, 170, 172, 174, 176, 178, 180, 272 182, 183, 185, 187, 188, 190, 192, 193, 195, 196, 198, 199, 273 200, 202, 203, 205, 206, 207, 208, 209, 210, 211, 212, 213, 274 214, 215, 216, 217, 218, 219, 220, 221, 222, 222, 223, 224, 275 225, 226, 226, 227, 228, 228, 229, 230, 230, 231, 232, 232, 276 233, 233, 234, 235, 235, 236, 236, 237, 237, 238, 238, 239, 277 239, 240 278}; 279 280/* 281 * Converting temps to (8-bit) hyst and over registers 282 * No interpolation here. 283 * The +50 is because the temps start at -50 284 */ 285static inline u8 TEMP_TO_REG(long val) 286{ 287 return via_lut[val <= -50000 ? 0 : val >= 110000 ? 160 : 288 (val < 0 ? val - 500 : val + 500) / 1000 + 50]; 289} 290 291/* for 8-bit temperature hyst and over registers */ 292#define TEMP_FROM_REG(val) ((long)temp_lut[val] * 100) 293 294/* for 10-bit temperature readings */ 295static inline long TEMP_FROM_REG10(u16 val) 296{ 297 u16 eight_bits = val >> 2; 298 u16 two_bits = val & 3; 299 300 /* no interpolation for these */ 301 if (two_bits == 0 || eight_bits == 255) 302 return TEMP_FROM_REG(eight_bits); 303 304 /* do some linear interpolation */ 305 return (temp_lut[eight_bits] * (4 - two_bits) + 306 temp_lut[eight_bits + 1] * two_bits) * 25; 307} 308 309#define DIV_FROM_REG(val) (1 << (val)) 310#define DIV_TO_REG(val) ((val) == 8 ? 3 : (val) == 4 ? 2 : (val) == 1 ? 0 : 1) 311 312/* 313 * For each registered chip, we need to keep some data in memory. 314 * The structure is dynamically allocated. 315 */ 316struct via686a_data { 317 unsigned short addr; 318 const char *name; 319 struct device *hwmon_dev; 320 struct mutex update_lock; 321 char valid; /* !=0 if following fields are valid */ 322 unsigned long last_updated; /* In jiffies */ 323 324 u8 in[5]; /* Register value */ 325 u8 in_max[5]; /* Register value */ 326 u8 in_min[5]; /* Register value */ 327 u8 fan[2]; /* Register value */ 328 u8 fan_min[2]; /* Register value */ 329 u16 temp[3]; /* Register value 10 bit */ 330 u8 temp_over[3]; /* Register value */ 331 u8 temp_hyst[3]; /* Register value */ 332 u8 fan_div[2]; /* Register encoding, shifted right */ 333 u16 alarms; /* Register encoding, combined */ 334}; 335 336static struct pci_dev *s_bridge; /* pointer to the (only) via686a */ 337 338static int via686a_probe(struct platform_device *pdev); 339static int via686a_remove(struct platform_device *pdev); 340 341static inline int via686a_read_value(struct via686a_data *data, u8 reg) 342{ 343 return inb_p(data->addr + reg); 344} 345 346static inline void via686a_write_value(struct via686a_data *data, u8 reg, 347 u8 value) 348{ 349 outb_p(value, data->addr + reg); 350} 351 352static struct via686a_data *via686a_update_device(struct device *dev); 353static void via686a_init_device(struct via686a_data *data); 354 355/* following are the sysfs callback functions */ 356 357/* 7 voltage sensors */ 358static ssize_t show_in(struct device *dev, struct device_attribute *da, 359 char *buf) { 360 struct via686a_data *data = via686a_update_device(dev); 361 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 362 int nr = attr->index; 363 return sprintf(buf, "%ld\n", IN_FROM_REG(data->in[nr], nr)); 364} 365 366static ssize_t show_in_min(struct device *dev, struct device_attribute *da, 367 char *buf) { 368 struct via686a_data *data = via686a_update_device(dev); 369 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 370 int nr = attr->index; 371 return sprintf(buf, "%ld\n", IN_FROM_REG(data->in_min[nr], nr)); 372} 373 374static ssize_t show_in_max(struct device *dev, struct device_attribute *da, 375 char *buf) { 376 struct via686a_data *data = via686a_update_device(dev); 377 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 378 int nr = attr->index; 379 return sprintf(buf, "%ld\n", IN_FROM_REG(data->in_max[nr], nr)); 380} 381 382static ssize_t set_in_min(struct device *dev, struct device_attribute *da, 383 const char *buf, size_t count) { 384 struct via686a_data *data = dev_get_drvdata(dev); 385 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 386 int nr = attr->index; 387 unsigned long val; 388 int err; 389 390 err = kstrtoul(buf, 10, &val); 391 if (err) 392 return err; 393 394 mutex_lock(&data->update_lock); 395 data->in_min[nr] = IN_TO_REG(val, nr); 396 via686a_write_value(data, VIA686A_REG_IN_MIN(nr), 397 data->in_min[nr]); 398 mutex_unlock(&data->update_lock); 399 return count; 400} 401static ssize_t set_in_max(struct device *dev, struct device_attribute *da, 402 const char *buf, size_t count) { 403 struct via686a_data *data = dev_get_drvdata(dev); 404 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 405 int nr = attr->index; 406 unsigned long val; 407 int err; 408 409 err = kstrtoul(buf, 10, &val); 410 if (err) 411 return err; 412 413 mutex_lock(&data->update_lock); 414 data->in_max[nr] = IN_TO_REG(val, nr); 415 via686a_write_value(data, VIA686A_REG_IN_MAX(nr), 416 data->in_max[nr]); 417 mutex_unlock(&data->update_lock); 418 return count; 419} 420#define show_in_offset(offset) \ 421static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \ 422 show_in, NULL, offset); \ 423static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \ 424 show_in_min, set_in_min, offset); \ 425static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \ 426 show_in_max, set_in_max, offset); 427 428show_in_offset(0); 429show_in_offset(1); 430show_in_offset(2); 431show_in_offset(3); 432show_in_offset(4); 433 434/* 3 temperatures */ 435static ssize_t show_temp(struct device *dev, struct device_attribute *da, 436 char *buf) { 437 struct via686a_data *data = via686a_update_device(dev); 438 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 439 int nr = attr->index; 440 return sprintf(buf, "%ld\n", TEMP_FROM_REG10(data->temp[nr])); 441} 442static ssize_t show_temp_over(struct device *dev, struct device_attribute *da, 443 char *buf) { 444 struct via686a_data *data = via686a_update_device(dev); 445 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 446 int nr = attr->index; 447 return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp_over[nr])); 448} 449static ssize_t show_temp_hyst(struct device *dev, struct device_attribute *da, 450 char *buf) { 451 struct via686a_data *data = via686a_update_device(dev); 452 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 453 int nr = attr->index; 454 return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp_hyst[nr])); 455} 456static ssize_t set_temp_over(struct device *dev, struct device_attribute *da, 457 const char *buf, size_t count) { 458 struct via686a_data *data = dev_get_drvdata(dev); 459 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 460 int nr = attr->index; 461 long val; 462 int err; 463 464 err = kstrtol(buf, 10, &val); 465 if (err) 466 return err; 467 468 mutex_lock(&data->update_lock); 469 data->temp_over[nr] = TEMP_TO_REG(val); 470 via686a_write_value(data, VIA686A_REG_TEMP_OVER[nr], 471 data->temp_over[nr]); 472 mutex_unlock(&data->update_lock); 473 return count; 474} 475static ssize_t set_temp_hyst(struct device *dev, struct device_attribute *da, 476 const char *buf, size_t count) { 477 struct via686a_data *data = dev_get_drvdata(dev); 478 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 479 int nr = attr->index; 480 long val; 481 int err; 482 483 err = kstrtol(buf, 10, &val); 484 if (err) 485 return err; 486 487 mutex_lock(&data->update_lock); 488 data->temp_hyst[nr] = TEMP_TO_REG(val); 489 via686a_write_value(data, VIA686A_REG_TEMP_HYST[nr], 490 data->temp_hyst[nr]); 491 mutex_unlock(&data->update_lock); 492 return count; 493} 494#define show_temp_offset(offset) \ 495static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, \ 496 show_temp, NULL, offset - 1); \ 497static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \ 498 show_temp_over, set_temp_over, offset - 1); \ 499static SENSOR_DEVICE_ATTR(temp##offset##_max_hyst, S_IRUGO | S_IWUSR, \ 500 show_temp_hyst, set_temp_hyst, offset - 1); 501 502show_temp_offset(1); 503show_temp_offset(2); 504show_temp_offset(3); 505 506/* 2 Fans */ 507static ssize_t show_fan(struct device *dev, struct device_attribute *da, 508 char *buf) { 509 struct via686a_data *data = via686a_update_device(dev); 510 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 511 int nr = attr->index; 512 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr], 513 DIV_FROM_REG(data->fan_div[nr]))); 514} 515static ssize_t show_fan_min(struct device *dev, struct device_attribute *da, 516 char *buf) { 517 struct via686a_data *data = via686a_update_device(dev); 518 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 519 int nr = attr->index; 520 return sprintf(buf, "%d\n", 521 FAN_FROM_REG(data->fan_min[nr], 522 DIV_FROM_REG(data->fan_div[nr]))); 523} 524static ssize_t show_fan_div(struct device *dev, struct device_attribute *da, 525 char *buf) { 526 struct via686a_data *data = via686a_update_device(dev); 527 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 528 int nr = attr->index; 529 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr])); 530} 531static ssize_t set_fan_min(struct device *dev, struct device_attribute *da, 532 const char *buf, size_t count) { 533 struct via686a_data *data = dev_get_drvdata(dev); 534 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 535 int nr = attr->index; 536 unsigned long val; 537 int err; 538 539 err = kstrtoul(buf, 10, &val); 540 if (err) 541 return err; 542 543 mutex_lock(&data->update_lock); 544 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr])); 545 via686a_write_value(data, VIA686A_REG_FAN_MIN(nr+1), data->fan_min[nr]); 546 mutex_unlock(&data->update_lock); 547 return count; 548} 549static ssize_t set_fan_div(struct device *dev, struct device_attribute *da, 550 const char *buf, size_t count) { 551 struct via686a_data *data = dev_get_drvdata(dev); 552 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 553 int nr = attr->index; 554 int old; 555 unsigned long val; 556 int err; 557 558 err = kstrtoul(buf, 10, &val); 559 if (err) 560 return err; 561 562 mutex_lock(&data->update_lock); 563 old = via686a_read_value(data, VIA686A_REG_FANDIV); 564 data->fan_div[nr] = DIV_TO_REG(val); 565 old = (old & 0x0f) | (data->fan_div[1] << 6) | (data->fan_div[0] << 4); 566 via686a_write_value(data, VIA686A_REG_FANDIV, old); 567 mutex_unlock(&data->update_lock); 568 return count; 569} 570 571#define show_fan_offset(offset) \ 572static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \ 573 show_fan, NULL, offset - 1); \ 574static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \ 575 show_fan_min, set_fan_min, offset - 1); \ 576static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \ 577 show_fan_div, set_fan_div, offset - 1); 578 579show_fan_offset(1); 580show_fan_offset(2); 581 582/* Alarms */ 583static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, 584 char *buf) 585{ 586 struct via686a_data *data = via686a_update_device(dev); 587 return sprintf(buf, "%u\n", data->alarms); 588} 589 590static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); 591 592static ssize_t show_alarm(struct device *dev, struct device_attribute *attr, 593 char *buf) 594{ 595 int bitnr = to_sensor_dev_attr(attr)->index; 596 struct via686a_data *data = via686a_update_device(dev); 597 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1); 598} 599static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0); 600static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1); 601static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2); 602static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3); 603static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8); 604static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4); 605static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 11); 606static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 15); 607static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6); 608static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7); 609 610static ssize_t show_name(struct device *dev, struct device_attribute 611 *devattr, char *buf) 612{ 613 struct via686a_data *data = dev_get_drvdata(dev); 614 return sprintf(buf, "%s\n", data->name); 615} 616static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); 617 618static struct attribute *via686a_attributes[] = { 619 &sensor_dev_attr_in0_input.dev_attr.attr, 620 &sensor_dev_attr_in1_input.dev_attr.attr, 621 &sensor_dev_attr_in2_input.dev_attr.attr, 622 &sensor_dev_attr_in3_input.dev_attr.attr, 623 &sensor_dev_attr_in4_input.dev_attr.attr, 624 &sensor_dev_attr_in0_min.dev_attr.attr, 625 &sensor_dev_attr_in1_min.dev_attr.attr, 626 &sensor_dev_attr_in2_min.dev_attr.attr, 627 &sensor_dev_attr_in3_min.dev_attr.attr, 628 &sensor_dev_attr_in4_min.dev_attr.attr, 629 &sensor_dev_attr_in0_max.dev_attr.attr, 630 &sensor_dev_attr_in1_max.dev_attr.attr, 631 &sensor_dev_attr_in2_max.dev_attr.attr, 632 &sensor_dev_attr_in3_max.dev_attr.attr, 633 &sensor_dev_attr_in4_max.dev_attr.attr, 634 &sensor_dev_attr_in0_alarm.dev_attr.attr, 635 &sensor_dev_attr_in1_alarm.dev_attr.attr, 636 &sensor_dev_attr_in2_alarm.dev_attr.attr, 637 &sensor_dev_attr_in3_alarm.dev_attr.attr, 638 &sensor_dev_attr_in4_alarm.dev_attr.attr, 639 640 &sensor_dev_attr_temp1_input.dev_attr.attr, 641 &sensor_dev_attr_temp2_input.dev_attr.attr, 642 &sensor_dev_attr_temp3_input.dev_attr.attr, 643 &sensor_dev_attr_temp1_max.dev_attr.attr, 644 &sensor_dev_attr_temp2_max.dev_attr.attr, 645 &sensor_dev_attr_temp3_max.dev_attr.attr, 646 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, 647 &sensor_dev_attr_temp2_max_hyst.dev_attr.attr, 648 &sensor_dev_attr_temp3_max_hyst.dev_attr.attr, 649 &sensor_dev_attr_temp1_alarm.dev_attr.attr, 650 &sensor_dev_attr_temp2_alarm.dev_attr.attr, 651 &sensor_dev_attr_temp3_alarm.dev_attr.attr, 652 653 &sensor_dev_attr_fan1_input.dev_attr.attr, 654 &sensor_dev_attr_fan2_input.dev_attr.attr, 655 &sensor_dev_attr_fan1_min.dev_attr.attr, 656 &sensor_dev_attr_fan2_min.dev_attr.attr, 657 &sensor_dev_attr_fan1_div.dev_attr.attr, 658 &sensor_dev_attr_fan2_div.dev_attr.attr, 659 &sensor_dev_attr_fan1_alarm.dev_attr.attr, 660 &sensor_dev_attr_fan2_alarm.dev_attr.attr, 661 662 &dev_attr_alarms.attr, 663 &dev_attr_name.attr, 664 NULL 665}; 666 667static const struct attribute_group via686a_group = { 668 .attrs = via686a_attributes, 669}; 670 671static struct platform_driver via686a_driver = { 672 .driver = { 673 .owner = THIS_MODULE, 674 .name = "via686a", 675 }, 676 .probe = via686a_probe, 677 .remove = via686a_remove, 678}; 679 680 681/* This is called when the module is loaded */ 682static int via686a_probe(struct platform_device *pdev) 683{ 684 struct via686a_data *data; 685 struct resource *res; 686 int err; 687 688 /* Reserve the ISA region */ 689 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 690 if (!devm_request_region(&pdev->dev, res->start, VIA686A_EXTENT, 691 via686a_driver.driver.name)) { 692 dev_err(&pdev->dev, "Region 0x%lx-0x%lx already in use!\n", 693 (unsigned long)res->start, (unsigned long)res->end); 694 return -ENODEV; 695 } 696 697 data = devm_kzalloc(&pdev->dev, sizeof(struct via686a_data), 698 GFP_KERNEL); 699 if (!data) 700 return -ENOMEM; 701 702 platform_set_drvdata(pdev, data); 703 data->addr = res->start; 704 data->name = "via686a"; 705 mutex_init(&data->update_lock); 706 707 /* Initialize the VIA686A chip */ 708 via686a_init_device(data); 709 710 /* Register sysfs hooks */ 711 err = sysfs_create_group(&pdev->dev.kobj, &via686a_group); 712 if (err) 713 return err; 714 715 data->hwmon_dev = hwmon_device_register(&pdev->dev); 716 if (IS_ERR(data->hwmon_dev)) { 717 err = PTR_ERR(data->hwmon_dev); 718 goto exit_remove_files; 719 } 720 721 return 0; 722 723exit_remove_files: 724 sysfs_remove_group(&pdev->dev.kobj, &via686a_group); 725 return err; 726} 727 728static int via686a_remove(struct platform_device *pdev) 729{ 730 struct via686a_data *data = platform_get_drvdata(pdev); 731 732 hwmon_device_unregister(data->hwmon_dev); 733 sysfs_remove_group(&pdev->dev.kobj, &via686a_group); 734 735 return 0; 736} 737 738static void via686a_update_fan_div(struct via686a_data *data) 739{ 740 int reg = via686a_read_value(data, VIA686A_REG_FANDIV); 741 data->fan_div[0] = (reg >> 4) & 0x03; 742 data->fan_div[1] = reg >> 6; 743} 744 745static void via686a_init_device(struct via686a_data *data) 746{ 747 u8 reg; 748 749 /* Start monitoring */ 750 reg = via686a_read_value(data, VIA686A_REG_CONFIG); 751 via686a_write_value(data, VIA686A_REG_CONFIG, (reg | 0x01) & 0x7F); 752 753 /* Configure temp interrupt mode for continuous-interrupt operation */ 754 reg = via686a_read_value(data, VIA686A_REG_TEMP_MODE); 755 via686a_write_value(data, VIA686A_REG_TEMP_MODE, 756 (reg & ~VIA686A_TEMP_MODE_MASK) 757 | VIA686A_TEMP_MODE_CONTINUOUS); 758 759 /* Pre-read fan clock divisor values */ 760 via686a_update_fan_div(data); 761} 762 763static struct via686a_data *via686a_update_device(struct device *dev) 764{ 765 struct via686a_data *data = dev_get_drvdata(dev); 766 int i; 767 768 mutex_lock(&data->update_lock); 769 770 if (time_after(jiffies, data->last_updated + HZ + HZ / 2) 771 || !data->valid) { 772 for (i = 0; i <= 4; i++) { 773 data->in[i] = 774 via686a_read_value(data, VIA686A_REG_IN(i)); 775 data->in_min[i] = via686a_read_value(data, 776 VIA686A_REG_IN_MIN 777 (i)); 778 data->in_max[i] = 779 via686a_read_value(data, VIA686A_REG_IN_MAX(i)); 780 } 781 for (i = 1; i <= 2; i++) { 782 data->fan[i - 1] = 783 via686a_read_value(data, VIA686A_REG_FAN(i)); 784 data->fan_min[i - 1] = via686a_read_value(data, 785 VIA686A_REG_FAN_MIN(i)); 786 } 787 for (i = 0; i <= 2; i++) { 788 data->temp[i] = via686a_read_value(data, 789 VIA686A_REG_TEMP[i]) << 2; 790 data->temp_over[i] = 791 via686a_read_value(data, 792 VIA686A_REG_TEMP_OVER[i]); 793 data->temp_hyst[i] = 794 via686a_read_value(data, 795 VIA686A_REG_TEMP_HYST[i]); 796 } 797 /* 798 * add in lower 2 bits 799 * temp1 uses bits 7-6 of VIA686A_REG_TEMP_LOW1 800 * temp2 uses bits 5-4 of VIA686A_REG_TEMP_LOW23 801 * temp3 uses bits 7-6 of VIA686A_REG_TEMP_LOW23 802 */ 803 data->temp[0] |= (via686a_read_value(data, 804 VIA686A_REG_TEMP_LOW1) 805 & 0xc0) >> 6; 806 data->temp[1] |= 807 (via686a_read_value(data, VIA686A_REG_TEMP_LOW23) & 808 0x30) >> 4; 809 data->temp[2] |= 810 (via686a_read_value(data, VIA686A_REG_TEMP_LOW23) & 811 0xc0) >> 6; 812 813 via686a_update_fan_div(data); 814 data->alarms = 815 via686a_read_value(data, 816 VIA686A_REG_ALARM1) | 817 (via686a_read_value(data, VIA686A_REG_ALARM2) << 8); 818 data->last_updated = jiffies; 819 data->valid = 1; 820 } 821 822 mutex_unlock(&data->update_lock); 823 824 return data; 825} 826 827static const struct pci_device_id via686a_pci_ids[] = { 828 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_4) }, 829 { } 830}; 831MODULE_DEVICE_TABLE(pci, via686a_pci_ids); 832 833static int via686a_device_add(unsigned short address) 834{ 835 struct resource res = { 836 .start = address, 837 .end = address + VIA686A_EXTENT - 1, 838 .name = "via686a", 839 .flags = IORESOURCE_IO, 840 }; 841 int err; 842 843 err = acpi_check_resource_conflict(&res); 844 if (err) 845 goto exit; 846 847 pdev = platform_device_alloc("via686a", address); 848 if (!pdev) { 849 err = -ENOMEM; 850 pr_err("Device allocation failed\n"); 851 goto exit; 852 } 853 854 err = platform_device_add_resources(pdev, &res, 1); 855 if (err) { 856 pr_err("Device resource addition failed (%d)\n", err); 857 goto exit_device_put; 858 } 859 860 err = platform_device_add(pdev); 861 if (err) { 862 pr_err("Device addition failed (%d)\n", err); 863 goto exit_device_put; 864 } 865 866 return 0; 867 868exit_device_put: 869 platform_device_put(pdev); 870exit: 871 return err; 872} 873 874static int via686a_pci_probe(struct pci_dev *dev, 875 const struct pci_device_id *id) 876{ 877 u16 address, val; 878 879 if (force_addr) { 880 address = force_addr & ~(VIA686A_EXTENT - 1); 881 dev_warn(&dev->dev, "Forcing ISA address 0x%x\n", address); 882 if (PCIBIOS_SUCCESSFUL != 883 pci_write_config_word(dev, VIA686A_BASE_REG, address | 1)) 884 return -ENODEV; 885 } 886 if (PCIBIOS_SUCCESSFUL != 887 pci_read_config_word(dev, VIA686A_BASE_REG, &val)) 888 return -ENODEV; 889 890 address = val & ~(VIA686A_EXTENT - 1); 891 if (address == 0) { 892 dev_err(&dev->dev, 893 "base address not set - upgrade BIOS or use force_addr=0xaddr\n"); 894 return -ENODEV; 895 } 896 897 if (PCIBIOS_SUCCESSFUL != 898 pci_read_config_word(dev, VIA686A_ENABLE_REG, &val)) 899 return -ENODEV; 900 if (!(val & 0x0001)) { 901 if (!force_addr) { 902 dev_warn(&dev->dev, 903 "Sensors disabled, enable with force_addr=0x%x\n", 904 address); 905 return -ENODEV; 906 } 907 908 dev_warn(&dev->dev, "Enabling sensors\n"); 909 if (PCIBIOS_SUCCESSFUL != 910 pci_write_config_word(dev, VIA686A_ENABLE_REG, 911 val | 0x0001)) 912 return -ENODEV; 913 } 914 915 if (platform_driver_register(&via686a_driver)) 916 goto exit; 917 918 /* Sets global pdev as a side effect */ 919 if (via686a_device_add(address)) 920 goto exit_unregister; 921 922 /* 923 * Always return failure here. This is to allow other drivers to bind 924 * to this pci device. We don't really want to have control over the 925 * pci device, we only wanted to read as few register values from it. 926 */ 927 s_bridge = pci_dev_get(dev); 928 return -ENODEV; 929 930exit_unregister: 931 platform_driver_unregister(&via686a_driver); 932exit: 933 return -ENODEV; 934} 935 936static struct pci_driver via686a_pci_driver = { 937 .name = "via686a", 938 .id_table = via686a_pci_ids, 939 .probe = via686a_pci_probe, 940}; 941 942static int __init sm_via686a_init(void) 943{ 944 return pci_register_driver(&via686a_pci_driver); 945} 946 947static void __exit sm_via686a_exit(void) 948{ 949 pci_unregister_driver(&via686a_pci_driver); 950 if (s_bridge != NULL) { 951 platform_device_unregister(pdev); 952 platform_driver_unregister(&via686a_driver); 953 pci_dev_put(s_bridge); 954 s_bridge = NULL; 955 } 956} 957 958MODULE_AUTHOR("Kyösti Mälkki <kmalkki@cc.hut.fi>, " 959 "Mark Studebaker <mdsxyz123@yahoo.com> " 960 "and Bob Dougherty <bobd@stanford.edu>"); 961MODULE_DESCRIPTION("VIA 686A Sensor device"); 962MODULE_LICENSE("GPL"); 963 964module_init(sm_via686a_init); 965module_exit(sm_via686a_exit); 966