2 via686a.c - Part of lm_sensors, Linux kernel modules
3 for hardware monitoring
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>.)
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.
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.
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.
28 Supports the Via VT82C686A, VT82C686B south bridges.
29 Reports all as a 686A.
30 Warning - only supports a single device.
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>
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");
55 Note that we can't determine the ISA address until we have initialized
57 static unsigned short address;
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
64 /* Many VIA686A constants specified below */
66 /* Length of ISA address segment */
67 #define VIA686A_EXTENT 0x80
68 #define VIA686A_BASE_REG 0x70
69 #define VIA686A_ENABLE_REG 0x74
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))
77 /* fans numbered 1-2 */
78 #define VIA686A_REG_FAN_MIN(nr) (0x3a + (nr))
79 #define VIA686A_REG_FAN(nr) (0x28 + (nr))
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 };
86 #define VIA686A_REG_TEMP_LOW1 0x4b
87 /* 2 = bits 5-4, 3 = bits 7-6 */
88 #define VIA686A_REG_TEMP_LOW23 0x49
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
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
105 /* Conversions. Limit checking is only done on the TO_REG
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];
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)
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. */
130 SENSORS_LIMIT((val * 21024 - 1205000) / 250000, 0, 255);
133 SENSORS_LIMIT((val * 15737 - 1205000) / 250000, 0, 255);
136 SENSORS_LIMIT((val * 10108 - 1205000) / 250000, 0, 255);
139 SENSORS_LIMIT((val * 41714 - 12050000) / 2500000, 0, 255);
142 static inline long IN_FROM_REG(u8 val, int inNum)
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. */
148 return (long) ((250000 * val + 1330000 + 21024 / 2) / 21024);
150 return (long) ((250000 * val + 1330000 + 15737 / 2) / 15737);
152 return (long) ((250000 * val + 1330000 + 10108 / 2) / 10108);
154 return (long) ((2500000 * val + 13300000 + 41714 / 2) / 41714);
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.
161 static inline u8 FAN_TO_REG(long rpm, int div)
165 rpm = SENSORS_LIMIT(rpm, 1, 1000000);
166 return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 255);
169 #define FAN_FROM_REG(val,div) ((val)==0?0:(val)==255?0:1350000/((val)*(div)))
171 /******** TEMP CONVERSIONS (Bob Dougherty) *********/
172 /* linear fits from HWMon.cpp (Copyright 1998-2000 Jonathan Teh Soon Yew)
174 return double(temp)*0.427-32.08;
175 else if(temp>=169 && temp<=202)
176 return double(temp)*0.582-58.16;
178 return double(temp)*0.924-127.33;
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.
187 (2000-10-25- RFD: thanks to Uwe Andersen <uandersen@mayah.com> for
188 finding my typos in this formula!)
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
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};
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)
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,
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)
270 return viaLUT[val <= -50000 ? 0 : val >= 110000 ? 160 :
271 (val < 0 ? val - 500 : val + 500) / 1000 + 50];
274 /* for 8-bit temperature hyst and over registers */
275 #define TEMP_FROM_REG(val) ((long)tempLUT[val] * 100)
277 /* for 10-bit temperature readings */
278 static inline long TEMP_FROM_REG10(u16 val)
280 u16 eightBits = val >> 2;
281 u16 twoBits = val & 3;
283 /* no interpolation for these */
284 if (twoBits == 0 || eightBits == 255)
285 return TEMP_FROM_REG(eightBits);
287 /* do some linear interpolation */
288 return (tempLUT[eightBits] * (4 - twoBits) +
289 tempLUT[eightBits + 1] * twoBits) * 25;
292 #define DIV_FROM_REG(val) (1 << (val))
293 #define DIV_TO_REG(val) ((val)==8?3:(val)==4?2:(val)==1?0:1)
295 /* For the VIA686A, we need to keep some data in memory.
296 The structure is dynamically allocated, at the same time when a new
297 via686a client is allocated. */
298 struct via686a_data {
299 struct i2c_client client;
300 struct class_device *class_dev;
301 struct mutex update_lock;
302 char valid; /* !=0 if following fields are valid */
303 unsigned long last_updated; /* In jiffies */
305 u8 in[5]; /* Register value */
306 u8 in_max[5]; /* Register value */
307 u8 in_min[5]; /* Register value */
308 u8 fan[2]; /* Register value */
309 u8 fan_min[2]; /* Register value */
310 u16 temp[3]; /* Register value 10 bit */
311 u8 temp_over[3]; /* Register value */
312 u8 temp_hyst[3]; /* Register value */
313 u8 fan_div[2]; /* Register encoding, shifted right */
314 u16 alarms; /* Register encoding, combined */
317 static struct pci_dev *s_bridge; /* pointer to the (only) via686a */
319 static int via686a_detect(struct i2c_adapter *adapter);
320 static int via686a_detach_client(struct i2c_client *client);
322 static inline int via686a_read_value(struct i2c_client *client, u8 reg)
324 return (inb_p(client->addr + reg));
327 static inline void via686a_write_value(struct i2c_client *client, u8 reg,
330 outb_p(value, client->addr + reg);
333 static struct via686a_data *via686a_update_device(struct device *dev);
334 static void via686a_init_client(struct i2c_client *client);
336 /* following are the sysfs callback functions */
338 /* 7 voltage sensors */
339 static ssize_t show_in(struct device *dev, char *buf, int nr) {
340 struct via686a_data *data = via686a_update_device(dev);
341 return sprintf(buf, "%ld\n", IN_FROM_REG(data->in[nr], nr));
344 static ssize_t show_in_min(struct device *dev, char *buf, int nr) {
345 struct via686a_data *data = via686a_update_device(dev);
346 return sprintf(buf, "%ld\n", IN_FROM_REG(data->in_min[nr], nr));
349 static ssize_t show_in_max(struct device *dev, char *buf, int nr) {
350 struct via686a_data *data = via686a_update_device(dev);
351 return sprintf(buf, "%ld\n", IN_FROM_REG(data->in_max[nr], nr));
354 static ssize_t set_in_min(struct device *dev, const char *buf,
355 size_t count, int nr) {
356 struct i2c_client *client = to_i2c_client(dev);
357 struct via686a_data *data = i2c_get_clientdata(client);
358 unsigned long val = simple_strtoul(buf, NULL, 10);
360 mutex_lock(&data->update_lock);
361 data->in_min[nr] = IN_TO_REG(val, nr);
362 via686a_write_value(client, VIA686A_REG_IN_MIN(nr),
364 mutex_unlock(&data->update_lock);
367 static ssize_t set_in_max(struct device *dev, const char *buf,
368 size_t count, int nr) {
369 struct i2c_client *client = to_i2c_client(dev);
370 struct via686a_data *data = i2c_get_clientdata(client);
371 unsigned long val = simple_strtoul(buf, NULL, 10);
373 mutex_lock(&data->update_lock);
374 data->in_max[nr] = IN_TO_REG(val, nr);
375 via686a_write_value(client, VIA686A_REG_IN_MAX(nr),
377 mutex_unlock(&data->update_lock);
380 #define show_in_offset(offset) \
382 show_in##offset (struct device *dev, struct device_attribute *attr, char *buf) \
384 return show_in(dev, buf, offset); \
387 show_in##offset##_min (struct device *dev, struct device_attribute *attr, char *buf) \
389 return show_in_min(dev, buf, offset); \
392 show_in##offset##_max (struct device *dev, struct device_attribute *attr, char *buf) \
394 return show_in_max(dev, buf, offset); \
396 static ssize_t set_in##offset##_min (struct device *dev, struct device_attribute *attr, \
397 const char *buf, size_t count) \
399 return set_in_min(dev, buf, count, offset); \
401 static ssize_t set_in##offset##_max (struct device *dev, struct device_attribute *attr, \
402 const char *buf, size_t count) \
404 return set_in_max(dev, buf, count, offset); \
406 static DEVICE_ATTR(in##offset##_input, S_IRUGO, show_in##offset, NULL);\
407 static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
408 show_in##offset##_min, set_in##offset##_min); \
409 static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
410 show_in##offset##_max, set_in##offset##_max);
419 static ssize_t show_temp(struct device *dev, char *buf, int nr) {
420 struct via686a_data *data = via686a_update_device(dev);
421 return sprintf(buf, "%ld\n", TEMP_FROM_REG10(data->temp[nr]));
423 static ssize_t show_temp_over(struct device *dev, char *buf, int nr) {
424 struct via686a_data *data = via686a_update_device(dev);
425 return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp_over[nr]));
427 static ssize_t show_temp_hyst(struct device *dev, char *buf, int nr) {
428 struct via686a_data *data = via686a_update_device(dev);
429 return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp_hyst[nr]));
431 static ssize_t set_temp_over(struct device *dev, const char *buf,
432 size_t count, int nr) {
433 struct i2c_client *client = to_i2c_client(dev);
434 struct via686a_data *data = i2c_get_clientdata(client);
435 int val = simple_strtol(buf, NULL, 10);
437 mutex_lock(&data->update_lock);
438 data->temp_over[nr] = TEMP_TO_REG(val);
439 via686a_write_value(client, VIA686A_REG_TEMP_OVER[nr],
440 data->temp_over[nr]);
441 mutex_unlock(&data->update_lock);
444 static ssize_t set_temp_hyst(struct device *dev, const char *buf,
445 size_t count, int nr) {
446 struct i2c_client *client = to_i2c_client(dev);
447 struct via686a_data *data = i2c_get_clientdata(client);
448 int val = simple_strtol(buf, NULL, 10);
450 mutex_lock(&data->update_lock);
451 data->temp_hyst[nr] = TEMP_TO_REG(val);
452 via686a_write_value(client, VIA686A_REG_TEMP_HYST[nr],
453 data->temp_hyst[nr]);
454 mutex_unlock(&data->update_lock);
457 #define show_temp_offset(offset) \
458 static ssize_t show_temp_##offset (struct device *dev, struct device_attribute *attr, char *buf) \
460 return show_temp(dev, buf, offset - 1); \
463 show_temp_##offset##_over (struct device *dev, struct device_attribute *attr, char *buf) \
465 return show_temp_over(dev, buf, offset - 1); \
468 show_temp_##offset##_hyst (struct device *dev, struct device_attribute *attr, char *buf) \
470 return show_temp_hyst(dev, buf, offset - 1); \
472 static ssize_t set_temp_##offset##_over (struct device *dev, struct device_attribute *attr, \
473 const char *buf, size_t count) \
475 return set_temp_over(dev, buf, count, offset - 1); \
477 static ssize_t set_temp_##offset##_hyst (struct device *dev, struct device_attribute *attr, \
478 const char *buf, size_t count) \
480 return set_temp_hyst(dev, buf, count, offset - 1); \
482 static DEVICE_ATTR(temp##offset##_input, S_IRUGO, show_temp_##offset, NULL);\
483 static DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
484 show_temp_##offset##_over, set_temp_##offset##_over); \
485 static DEVICE_ATTR(temp##offset##_max_hyst, S_IRUGO | S_IWUSR, \
486 show_temp_##offset##_hyst, set_temp_##offset##_hyst);
493 static ssize_t show_fan(struct device *dev, char *buf, int nr) {
494 struct via686a_data *data = via686a_update_device(dev);
495 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
496 DIV_FROM_REG(data->fan_div[nr])) );
498 static ssize_t show_fan_min(struct device *dev, char *buf, int nr) {
499 struct via686a_data *data = via686a_update_device(dev);
500 return sprintf(buf, "%d\n",
501 FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr])) );
503 static ssize_t show_fan_div(struct device *dev, char *buf, int nr) {
504 struct via686a_data *data = via686a_update_device(dev);
505 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]) );
507 static ssize_t set_fan_min(struct device *dev, const char *buf,
508 size_t count, int nr) {
509 struct i2c_client *client = to_i2c_client(dev);
510 struct via686a_data *data = i2c_get_clientdata(client);
511 int val = simple_strtol(buf, NULL, 10);
513 mutex_lock(&data->update_lock);
514 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
515 via686a_write_value(client, VIA686A_REG_FAN_MIN(nr+1), data->fan_min[nr]);
516 mutex_unlock(&data->update_lock);
519 static ssize_t set_fan_div(struct device *dev, const char *buf,
520 size_t count, int nr) {
521 struct i2c_client *client = to_i2c_client(dev);
522 struct via686a_data *data = i2c_get_clientdata(client);
523 int val = simple_strtol(buf, NULL, 10);
526 mutex_lock(&data->update_lock);
527 old = via686a_read_value(client, VIA686A_REG_FANDIV);
528 data->fan_div[nr] = DIV_TO_REG(val);
529 old = (old & 0x0f) | (data->fan_div[1] << 6) | (data->fan_div[0] << 4);
530 via686a_write_value(client, VIA686A_REG_FANDIV, old);
531 mutex_unlock(&data->update_lock);
535 #define show_fan_offset(offset) \
536 static ssize_t show_fan_##offset (struct device *dev, struct device_attribute *attr, char *buf) \
538 return show_fan(dev, buf, offset - 1); \
540 static ssize_t show_fan_##offset##_min (struct device *dev, struct device_attribute *attr, char *buf) \
542 return show_fan_min(dev, buf, offset - 1); \
544 static ssize_t show_fan_##offset##_div (struct device *dev, struct device_attribute *attr, char *buf) \
546 return show_fan_div(dev, buf, offset - 1); \
548 static ssize_t set_fan_##offset##_min (struct device *dev, struct device_attribute *attr, \
549 const char *buf, size_t count) \
551 return set_fan_min(dev, buf, count, offset - 1); \
553 static ssize_t set_fan_##offset##_div (struct device *dev, struct device_attribute *attr, \
554 const char *buf, size_t count) \
556 return set_fan_div(dev, buf, count, offset - 1); \
558 static DEVICE_ATTR(fan##offset##_input, S_IRUGO, show_fan_##offset, NULL);\
559 static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
560 show_fan_##offset##_min, set_fan_##offset##_min); \
561 static DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
562 show_fan_##offset##_div, set_fan_##offset##_div);
568 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf) {
569 struct via686a_data *data = via686a_update_device(dev);
570 return sprintf(buf, "%u\n", data->alarms);
572 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
574 static struct attribute *via686a_attributes[] = {
575 &dev_attr_in0_input.attr,
576 &dev_attr_in1_input.attr,
577 &dev_attr_in2_input.attr,
578 &dev_attr_in3_input.attr,
579 &dev_attr_in4_input.attr,
580 &dev_attr_in0_min.attr,
581 &dev_attr_in1_min.attr,
582 &dev_attr_in2_min.attr,
583 &dev_attr_in3_min.attr,
584 &dev_attr_in4_min.attr,
585 &dev_attr_in0_max.attr,
586 &dev_attr_in1_max.attr,
587 &dev_attr_in2_max.attr,
588 &dev_attr_in3_max.attr,
589 &dev_attr_in4_max.attr,
591 &dev_attr_temp1_input.attr,
592 &dev_attr_temp2_input.attr,
593 &dev_attr_temp3_input.attr,
594 &dev_attr_temp1_max.attr,
595 &dev_attr_temp2_max.attr,
596 &dev_attr_temp3_max.attr,
597 &dev_attr_temp1_max_hyst.attr,
598 &dev_attr_temp2_max_hyst.attr,
599 &dev_attr_temp3_max_hyst.attr,
601 &dev_attr_fan1_input.attr,
602 &dev_attr_fan2_input.attr,
603 &dev_attr_fan1_min.attr,
604 &dev_attr_fan2_min.attr,
605 &dev_attr_fan1_div.attr,
606 &dev_attr_fan2_div.attr,
608 &dev_attr_alarms.attr,
612 static const struct attribute_group via686a_group = {
613 .attrs = via686a_attributes,
616 /* The driver. I choose to use type i2c_driver, as at is identical to both
617 smbus_driver and isa_driver, and clients could be of either kind */
618 static struct i2c_driver via686a_driver = {
620 .owner = THIS_MODULE,
623 .attach_adapter = via686a_detect,
624 .detach_client = via686a_detach_client,
628 /* This is called when the module is loaded */
629 static int via686a_detect(struct i2c_adapter *adapter)
631 struct i2c_client *new_client;
632 struct via686a_data *data;
634 const char client_name[] = "via686a";
637 /* 8231 requires multiple of 256, we enforce that on 686 as well */
639 address = force_addr & 0xFF00;
640 dev_warn(&adapter->dev, "forcing ISA address 0x%04X\n",
642 if (PCIBIOS_SUCCESSFUL !=
643 pci_write_config_word(s_bridge, VIA686A_BASE_REG, address))
646 if (PCIBIOS_SUCCESSFUL !=
647 pci_read_config_word(s_bridge, VIA686A_ENABLE_REG, &val))
649 if (!(val & 0x0001)) {
651 dev_info(&adapter->dev, "enabling sensors\n");
652 if (PCIBIOS_SUCCESSFUL !=
653 pci_write_config_word(s_bridge, VIA686A_ENABLE_REG,
657 dev_warn(&adapter->dev, "sensors disabled - enable "
658 "with force_addr=0x%x\n", address);
663 /* Reserve the ISA region */
664 if (!request_region(address, VIA686A_EXTENT,
665 via686a_driver.driver.name)) {
666 dev_err(&adapter->dev, "region 0x%x already in use!\n",
671 if (!(data = kzalloc(sizeof(struct via686a_data), GFP_KERNEL))) {
676 new_client = &data->client;
677 i2c_set_clientdata(new_client, data);
678 new_client->addr = address;
679 new_client->adapter = adapter;
680 new_client->driver = &via686a_driver;
681 new_client->flags = 0;
683 /* Fill in the remaining client fields and put into the global list */
684 strlcpy(new_client->name, client_name, I2C_NAME_SIZE);
687 mutex_init(&data->update_lock);
688 /* Tell the I2C layer a new client has arrived */
689 if ((err = i2c_attach_client(new_client)))
692 /* Initialize the VIA686A chip */
693 via686a_init_client(new_client);
695 /* Register sysfs hooks */
696 if ((err = sysfs_create_group(&new_client->dev.kobj, &via686a_group)))
699 data->class_dev = hwmon_device_register(&new_client->dev);
700 if (IS_ERR(data->class_dev)) {
701 err = PTR_ERR(data->class_dev);
702 goto exit_remove_files;
708 sysfs_remove_group(&new_client->dev.kobj, &via686a_group);
710 i2c_detach_client(new_client);
714 release_region(address, VIA686A_EXTENT);
718 static int via686a_detach_client(struct i2c_client *client)
720 struct via686a_data *data = i2c_get_clientdata(client);
723 hwmon_device_unregister(data->class_dev);
724 sysfs_remove_group(&client->dev.kobj, &via686a_group);
726 if ((err = i2c_detach_client(client)))
729 release_region(client->addr, VIA686A_EXTENT);
735 static void via686a_init_client(struct i2c_client *client)
739 /* Start monitoring */
740 reg = via686a_read_value(client, VIA686A_REG_CONFIG);
741 via686a_write_value(client, VIA686A_REG_CONFIG, (reg|0x01)&0x7F);
743 /* Configure temp interrupt mode for continuous-interrupt operation */
744 via686a_write_value(client, VIA686A_REG_TEMP_MODE,
745 via686a_read_value(client, VIA686A_REG_TEMP_MODE) &
746 !(VIA686A_TEMP_MODE_MASK | VIA686A_TEMP_MODE_CONTINUOUS));
749 static struct via686a_data *via686a_update_device(struct device *dev)
751 struct i2c_client *client = to_i2c_client(dev);
752 struct via686a_data *data = i2c_get_clientdata(client);
755 mutex_lock(&data->update_lock);
757 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
759 for (i = 0; i <= 4; i++) {
761 via686a_read_value(client, VIA686A_REG_IN(i));
762 data->in_min[i] = via686a_read_value(client,
766 via686a_read_value(client, VIA686A_REG_IN_MAX(i));
768 for (i = 1; i <= 2; i++) {
770 via686a_read_value(client, VIA686A_REG_FAN(i));
771 data->fan_min[i - 1] = via686a_read_value(client,
772 VIA686A_REG_FAN_MIN(i));
774 for (i = 0; i <= 2; i++) {
775 data->temp[i] = via686a_read_value(client,
776 VIA686A_REG_TEMP[i]) << 2;
778 via686a_read_value(client,
779 VIA686A_REG_TEMP_OVER[i]);
781 via686a_read_value(client,
782 VIA686A_REG_TEMP_HYST[i]);
784 /* add in lower 2 bits
785 temp1 uses bits 7-6 of VIA686A_REG_TEMP_LOW1
786 temp2 uses bits 5-4 of VIA686A_REG_TEMP_LOW23
787 temp3 uses bits 7-6 of VIA686A_REG_TEMP_LOW23
789 data->temp[0] |= (via686a_read_value(client,
790 VIA686A_REG_TEMP_LOW1)
793 (via686a_read_value(client, VIA686A_REG_TEMP_LOW23) &
796 (via686a_read_value(client, VIA686A_REG_TEMP_LOW23) &
799 i = via686a_read_value(client, VIA686A_REG_FANDIV);
800 data->fan_div[0] = (i >> 4) & 0x03;
801 data->fan_div[1] = i >> 6;
803 via686a_read_value(client,
804 VIA686A_REG_ALARM1) |
805 (via686a_read_value(client, VIA686A_REG_ALARM2) << 8);
806 data->last_updated = jiffies;
810 mutex_unlock(&data->update_lock);
815 static struct pci_device_id via686a_pci_ids[] = {
816 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_4) },
820 MODULE_DEVICE_TABLE(pci, via686a_pci_ids);
822 static int __devinit via686a_pci_probe(struct pci_dev *dev,
823 const struct pci_device_id *id)
827 if (PCIBIOS_SUCCESSFUL !=
828 pci_read_config_word(dev, VIA686A_BASE_REG, &val))
831 address = val & ~(VIA686A_EXTENT - 1);
832 if (address == 0 && force_addr == 0) {
833 dev_err(&dev->dev, "base address not set - upgrade BIOS "
834 "or use force_addr=0xaddr\n");
838 s_bridge = pci_dev_get(dev);
839 if (i2c_isa_add_driver(&via686a_driver)) {
840 pci_dev_put(s_bridge);
844 /* Always return failure here. This is to allow other drivers to bind
845 * to this pci device. We don't really want to have control over the
846 * pci device, we only wanted to read as few register values from it.
851 static struct pci_driver via686a_pci_driver = {
853 .id_table = via686a_pci_ids,
854 .probe = via686a_pci_probe,
857 static int __init sm_via686a_init(void)
859 return pci_register_driver(&via686a_pci_driver);
862 static void __exit sm_via686a_exit(void)
864 pci_unregister_driver(&via686a_pci_driver);
865 if (s_bridge != NULL) {
866 i2c_isa_del_driver(&via686a_driver);
867 pci_dev_put(s_bridge);
872 MODULE_AUTHOR("Kyösti Mälkki <kmalkki@cc.hut.fi>, "
873 "Mark Studebaker <mdsxyz123@yahoo.com> "
874 "and Bob Dougherty <bobd@stanford.edu>");
875 MODULE_DESCRIPTION("VIA 686A Sensor device");
876 MODULE_LICENSE("GPL");
878 module_init(sm_via686a_init);
879 module_exit(sm_via686a_exit);