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