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 DIV_FROM_REG(val) (1 << (val))
296 #define DIV_TO_REG(val) ((val)==8?3:(val)==4?2:(val)==1?0:1)
298 /* For the VIA686A, we need to keep some data in memory.
299 The structure is dynamically allocated, at the same time when a new
300 via686a client is allocated. */
301 struct via686a_data {
302 struct i2c_client client;
303 struct semaphore update_lock;
304 char valid; /* !=0 if following fields are valid */
305 unsigned long last_updated; /* In jiffies */
307 u8 in[5]; /* Register value */
308 u8 in_max[5]; /* Register value */
309 u8 in_min[5]; /* Register value */
310 u8 fan[2]; /* Register value */
311 u8 fan_min[2]; /* Register value */
312 u16 temp[3]; /* Register value 10 bit */
313 u8 temp_over[3]; /* Register value */
314 u8 temp_hyst[3]; /* Register value */
315 u8 fan_div[2]; /* Register encoding, shifted right */
316 u16 alarms; /* Register encoding, combined */
319 static struct pci_dev *s_bridge; /* pointer to the (only) via686a */
321 static int via686a_attach_adapter(struct i2c_adapter *adapter);
322 static int via686a_detect(struct i2c_adapter *adapter, int address, int kind);
323 static int via686a_detach_client(struct i2c_client *client);
325 static inline int via686a_read_value(struct i2c_client *client, u8 reg)
327 return (inb_p(client->addr + reg));
330 static inline void via686a_write_value(struct i2c_client *client, u8 reg,
333 outb_p(value, client->addr + reg);
336 static struct via686a_data *via686a_update_device(struct device *dev);
337 static void via686a_init_client(struct i2c_client *client);
339 /* following are the sysfs callback functions */
341 /* 7 voltage sensors */
342 static ssize_t show_in(struct device *dev, char *buf, int nr) {
343 struct via686a_data *data = via686a_update_device(dev);
344 return sprintf(buf, "%ld\n", IN_FROM_REG(data->in[nr], nr));
347 static ssize_t show_in_min(struct device *dev, char *buf, int nr) {
348 struct via686a_data *data = via686a_update_device(dev);
349 return sprintf(buf, "%ld\n", IN_FROM_REG(data->in_min[nr], nr));
352 static ssize_t show_in_max(struct device *dev, char *buf, int nr) {
353 struct via686a_data *data = via686a_update_device(dev);
354 return sprintf(buf, "%ld\n", IN_FROM_REG(data->in_max[nr], nr));
357 static ssize_t set_in_min(struct device *dev, const char *buf,
358 size_t count, int nr) {
359 struct i2c_client *client = to_i2c_client(dev);
360 struct via686a_data *data = i2c_get_clientdata(client);
361 unsigned long val = simple_strtoul(buf, NULL, 10);
363 down(&data->update_lock);
364 data->in_min[nr] = IN_TO_REG(val,nr);
365 via686a_write_value(client, VIA686A_REG_IN_MIN(nr),
367 up(&data->update_lock);
370 static ssize_t set_in_max(struct device *dev, const char *buf,
371 size_t count, int nr) {
372 struct i2c_client *client = to_i2c_client(dev);
373 struct via686a_data *data = i2c_get_clientdata(client);
374 unsigned long val = simple_strtoul(buf, NULL, 10);
376 down(&data->update_lock);
377 data->in_max[nr] = IN_TO_REG(val,nr);
378 via686a_write_value(client, VIA686A_REG_IN_MAX(nr),
380 up(&data->update_lock);
383 #define show_in_offset(offset) \
385 show_in##offset (struct device *dev, struct device_attribute *attr, char *buf) \
387 return show_in(dev, buf, offset); \
390 show_in##offset##_min (struct device *dev, struct device_attribute *attr, char *buf) \
392 return show_in_min(dev, buf, offset); \
395 show_in##offset##_max (struct device *dev, struct device_attribute *attr, char *buf) \
397 return show_in_max(dev, buf, offset); \
399 static ssize_t set_in##offset##_min (struct device *dev, struct device_attribute *attr, \
400 const char *buf, size_t count) \
402 return set_in_min(dev, buf, count, offset); \
404 static ssize_t set_in##offset##_max (struct device *dev, struct device_attribute *attr, \
405 const char *buf, size_t count) \
407 return set_in_max(dev, buf, count, offset); \
409 static DEVICE_ATTR(in##offset##_input, S_IRUGO, show_in##offset, NULL);\
410 static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
411 show_in##offset##_min, set_in##offset##_min); \
412 static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
413 show_in##offset##_max, set_in##offset##_max);
422 static ssize_t show_temp(struct device *dev, char *buf, int nr) {
423 struct via686a_data *data = via686a_update_device(dev);
424 return sprintf(buf, "%ld\n", TEMP_FROM_REG10(data->temp[nr]));
426 static ssize_t show_temp_over(struct device *dev, char *buf, int nr) {
427 struct via686a_data *data = via686a_update_device(dev);
428 return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp_over[nr]));
430 static ssize_t show_temp_hyst(struct device *dev, char *buf, int nr) {
431 struct via686a_data *data = via686a_update_device(dev);
432 return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp_hyst[nr]));
434 static ssize_t set_temp_over(struct device *dev, const char *buf,
435 size_t count, int nr) {
436 struct i2c_client *client = to_i2c_client(dev);
437 struct via686a_data *data = i2c_get_clientdata(client);
438 int val = simple_strtol(buf, NULL, 10);
440 down(&data->update_lock);
441 data->temp_over[nr] = TEMP_TO_REG(val);
442 via686a_write_value(client, VIA686A_REG_TEMP_OVER(nr), data->temp_over[nr]);
443 up(&data->update_lock);
446 static ssize_t set_temp_hyst(struct device *dev, const char *buf,
447 size_t count, int nr) {
448 struct i2c_client *client = to_i2c_client(dev);
449 struct via686a_data *data = i2c_get_clientdata(client);
450 int val = simple_strtol(buf, NULL, 10);
452 down(&data->update_lock);
453 data->temp_hyst[nr] = TEMP_TO_REG(val);
454 via686a_write_value(client, VIA686A_REG_TEMP_HYST(nr), data->temp_hyst[nr]);
455 up(&data->update_lock);
458 #define show_temp_offset(offset) \
459 static ssize_t show_temp_##offset (struct device *dev, struct device_attribute *attr, char *buf) \
461 return show_temp(dev, buf, offset - 1); \
464 show_temp_##offset##_over (struct device *dev, struct device_attribute *attr, char *buf) \
466 return show_temp_over(dev, buf, offset - 1); \
469 show_temp_##offset##_hyst (struct device *dev, struct device_attribute *attr, char *buf) \
471 return show_temp_hyst(dev, buf, offset - 1); \
473 static ssize_t set_temp_##offset##_over (struct device *dev, struct device_attribute *attr, \
474 const char *buf, size_t count) \
476 return set_temp_over(dev, buf, count, offset - 1); \
478 static ssize_t set_temp_##offset##_hyst (struct device *dev, struct device_attribute *attr, \
479 const char *buf, size_t count) \
481 return set_temp_hyst(dev, buf, count, offset - 1); \
483 static DEVICE_ATTR(temp##offset##_input, S_IRUGO, show_temp_##offset, NULL);\
484 static DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
485 show_temp_##offset##_over, set_temp_##offset##_over); \
486 static DEVICE_ATTR(temp##offset##_max_hyst, S_IRUGO | S_IWUSR, \
487 show_temp_##offset##_hyst, set_temp_##offset##_hyst);
494 static ssize_t show_fan(struct device *dev, char *buf, int nr) {
495 struct via686a_data *data = via686a_update_device(dev);
496 return sprintf(buf,"%d\n", FAN_FROM_REG(data->fan[nr],
497 DIV_FROM_REG(data->fan_div[nr])) );
499 static ssize_t show_fan_min(struct device *dev, char *buf, int nr) {
500 struct via686a_data *data = via686a_update_device(dev);
501 return sprintf(buf,"%d\n",
502 FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr])) );
504 static ssize_t show_fan_div(struct device *dev, char *buf, int nr) {
505 struct via686a_data *data = via686a_update_device(dev);
506 return sprintf(buf,"%d\n", DIV_FROM_REG(data->fan_div[nr]) );
508 static ssize_t set_fan_min(struct device *dev, const char *buf,
509 size_t count, int nr) {
510 struct i2c_client *client = to_i2c_client(dev);
511 struct via686a_data *data = i2c_get_clientdata(client);
512 int val = simple_strtol(buf, NULL, 10);
514 down(&data->update_lock);
515 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
516 via686a_write_value(client, VIA686A_REG_FAN_MIN(nr+1), data->fan_min[nr]);
517 up(&data->update_lock);
520 static ssize_t set_fan_div(struct device *dev, const char *buf,
521 size_t count, int nr) {
522 struct i2c_client *client = to_i2c_client(dev);
523 struct via686a_data *data = i2c_get_clientdata(client);
524 int val = simple_strtol(buf, NULL, 10);
527 down(&data->update_lock);
528 old = via686a_read_value(client, VIA686A_REG_FANDIV);
529 data->fan_div[nr] = DIV_TO_REG(val);
530 old = (old & 0x0f) | (data->fan_div[1] << 6) | (data->fan_div[0] << 4);
531 via686a_write_value(client, VIA686A_REG_FANDIV, old);
532 up(&data->update_lock);
536 #define show_fan_offset(offset) \
537 static ssize_t show_fan_##offset (struct device *dev, struct device_attribute *attr, char *buf) \
539 return show_fan(dev, buf, offset - 1); \
541 static ssize_t show_fan_##offset##_min (struct device *dev, struct device_attribute *attr, char *buf) \
543 return show_fan_min(dev, buf, offset - 1); \
545 static ssize_t show_fan_##offset##_div (struct device *dev, struct device_attribute *attr, char *buf) \
547 return show_fan_div(dev, buf, offset - 1); \
549 static ssize_t set_fan_##offset##_min (struct device *dev, struct device_attribute *attr, \
550 const char *buf, size_t count) \
552 return set_fan_min(dev, buf, count, offset - 1); \
554 static ssize_t set_fan_##offset##_div (struct device *dev, struct device_attribute *attr, \
555 const char *buf, size_t count) \
557 return set_fan_div(dev, buf, count, offset - 1); \
559 static DEVICE_ATTR(fan##offset##_input, S_IRUGO, show_fan_##offset, NULL);\
560 static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
561 show_fan_##offset##_min, set_fan_##offset##_min); \
562 static DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
563 show_fan_##offset##_div, set_fan_##offset##_div);
569 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf) {
570 struct via686a_data *data = via686a_update_device(dev);
571 return sprintf(buf, "%u\n", data->alarms);
573 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
575 /* The driver. I choose to use type i2c_driver, as at is identical to both
576 smbus_driver and isa_driver, and clients could be of either kind */
577 static struct i2c_driver via686a_driver = {
578 .owner = THIS_MODULE,
580 .id = I2C_DRIVERID_VIA686A,
581 .flags = I2C_DF_NOTIFY,
582 .attach_adapter = via686a_attach_adapter,
583 .detach_client = via686a_detach_client,
587 /* This is called when the module is loaded */
588 static int via686a_attach_adapter(struct i2c_adapter *adapter)
590 if (!(adapter->class & I2C_CLASS_HWMON))
592 return i2c_detect(adapter, &addr_data, via686a_detect);
595 static int via686a_detect(struct i2c_adapter *adapter, int address, int kind)
597 struct i2c_client *new_client;
598 struct via686a_data *data;
600 const char client_name[] = "via686a";
603 /* Make sure we are probing the ISA bus!! */
604 if (!i2c_is_isa_adapter(adapter)) {
605 dev_err(&adapter->dev,
606 "via686a_detect called for an I2C bus adapter?!?\n");
610 /* 8231 requires multiple of 256, we enforce that on 686 as well */
612 address = force_addr & 0xFF00;
615 dev_warn(&adapter->dev,"forcing ISA address 0x%04X\n", address);
616 if (PCIBIOS_SUCCESSFUL !=
617 pci_write_config_word(s_bridge, VIA686A_BASE_REG, address))
620 if (PCIBIOS_SUCCESSFUL !=
621 pci_read_config_word(s_bridge, VIA686A_ENABLE_REG, &val))
623 if (!(val & 0x0001)) {
624 dev_warn(&adapter->dev,"enabling sensors\n");
625 if (PCIBIOS_SUCCESSFUL !=
626 pci_write_config_word(s_bridge, VIA686A_ENABLE_REG,
631 /* Reserve the ISA region */
632 if (!request_region(address, VIA686A_EXTENT, via686a_driver.name)) {
633 dev_err(&adapter->dev,"region 0x%x already in use!\n",
638 if (!(data = kmalloc(sizeof(struct via686a_data), GFP_KERNEL))) {
642 memset(data, 0, sizeof(struct via686a_data));
644 new_client = &data->client;
645 i2c_set_clientdata(new_client, data);
646 new_client->addr = address;
647 new_client->adapter = adapter;
648 new_client->driver = &via686a_driver;
649 new_client->flags = 0;
651 /* Fill in the remaining client fields and put into the global list */
652 strlcpy(new_client->name, client_name, I2C_NAME_SIZE);
655 init_MUTEX(&data->update_lock);
656 /* Tell the I2C layer a new client has arrived */
657 if ((err = i2c_attach_client(new_client)))
660 /* Initialize the VIA686A chip */
661 via686a_init_client(new_client);
663 /* Register sysfs hooks */
664 device_create_file(&new_client->dev, &dev_attr_in0_input);
665 device_create_file(&new_client->dev, &dev_attr_in1_input);
666 device_create_file(&new_client->dev, &dev_attr_in2_input);
667 device_create_file(&new_client->dev, &dev_attr_in3_input);
668 device_create_file(&new_client->dev, &dev_attr_in4_input);
669 device_create_file(&new_client->dev, &dev_attr_in0_min);
670 device_create_file(&new_client->dev, &dev_attr_in1_min);
671 device_create_file(&new_client->dev, &dev_attr_in2_min);
672 device_create_file(&new_client->dev, &dev_attr_in3_min);
673 device_create_file(&new_client->dev, &dev_attr_in4_min);
674 device_create_file(&new_client->dev, &dev_attr_in0_max);
675 device_create_file(&new_client->dev, &dev_attr_in1_max);
676 device_create_file(&new_client->dev, &dev_attr_in2_max);
677 device_create_file(&new_client->dev, &dev_attr_in3_max);
678 device_create_file(&new_client->dev, &dev_attr_in4_max);
679 device_create_file(&new_client->dev, &dev_attr_temp1_input);
680 device_create_file(&new_client->dev, &dev_attr_temp2_input);
681 device_create_file(&new_client->dev, &dev_attr_temp3_input);
682 device_create_file(&new_client->dev, &dev_attr_temp1_max);
683 device_create_file(&new_client->dev, &dev_attr_temp2_max);
684 device_create_file(&new_client->dev, &dev_attr_temp3_max);
685 device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst);
686 device_create_file(&new_client->dev, &dev_attr_temp2_max_hyst);
687 device_create_file(&new_client->dev, &dev_attr_temp3_max_hyst);
688 device_create_file(&new_client->dev, &dev_attr_fan1_input);
689 device_create_file(&new_client->dev, &dev_attr_fan2_input);
690 device_create_file(&new_client->dev, &dev_attr_fan1_min);
691 device_create_file(&new_client->dev, &dev_attr_fan2_min);
692 device_create_file(&new_client->dev, &dev_attr_fan1_div);
693 device_create_file(&new_client->dev, &dev_attr_fan2_div);
694 device_create_file(&new_client->dev, &dev_attr_alarms);
701 release_region(address, VIA686A_EXTENT);
705 static int via686a_detach_client(struct i2c_client *client)
709 if ((err = i2c_detach_client(client))) {
710 dev_err(&client->dev,
711 "Client deregistration failed, client not detached.\n");
715 release_region(client->addr, VIA686A_EXTENT);
716 kfree(i2c_get_clientdata(client));
721 /* Called when we have found a new VIA686A. Set limits, etc. */
722 static void via686a_init_client(struct i2c_client *client)
726 /* Start monitoring */
727 reg = via686a_read_value(client, VIA686A_REG_CONFIG);
728 via686a_write_value(client, VIA686A_REG_CONFIG, (reg|0x01)&0x7F);
730 /* Configure temp interrupt mode for continuous-interrupt operation */
731 via686a_write_value(client, VIA686A_REG_TEMP_MODE,
732 via686a_read_value(client, VIA686A_REG_TEMP_MODE) &
733 !(VIA686A_TEMP_MODE_MASK | VIA686A_TEMP_MODE_CONTINUOUS));
736 static struct via686a_data *via686a_update_device(struct device *dev)
738 struct i2c_client *client = to_i2c_client(dev);
739 struct via686a_data *data = i2c_get_clientdata(client);
742 down(&data->update_lock);
744 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
746 for (i = 0; i <= 4; i++) {
748 via686a_read_value(client, VIA686A_REG_IN(i));
749 data->in_min[i] = via686a_read_value(client,
753 via686a_read_value(client, VIA686A_REG_IN_MAX(i));
755 for (i = 1; i <= 2; i++) {
757 via686a_read_value(client, VIA686A_REG_FAN(i));
758 data->fan_min[i - 1] = via686a_read_value(client,
759 VIA686A_REG_FAN_MIN(i));
761 for (i = 0; i <= 2; i++) {
762 data->temp[i] = via686a_read_value(client,
763 VIA686A_REG_TEMP(i)) << 2;
765 via686a_read_value(client,
766 VIA686A_REG_TEMP_OVER(i));
768 via686a_read_value(client,
769 VIA686A_REG_TEMP_HYST(i));
771 /* add in lower 2 bits
772 temp1 uses bits 7-6 of VIA686A_REG_TEMP_LOW1
773 temp2 uses bits 5-4 of VIA686A_REG_TEMP_LOW23
774 temp3 uses bits 7-6 of VIA686A_REG_TEMP_LOW23
776 data->temp[0] |= (via686a_read_value(client,
777 VIA686A_REG_TEMP_LOW1)
780 (via686a_read_value(client, VIA686A_REG_TEMP_LOW23) &
783 (via686a_read_value(client, VIA686A_REG_TEMP_LOW23) &
786 i = via686a_read_value(client, VIA686A_REG_FANDIV);
787 data->fan_div[0] = (i >> 4) & 0x03;
788 data->fan_div[1] = i >> 6;
790 via686a_read_value(client,
791 VIA686A_REG_ALARM1) |
792 (via686a_read_value(client, VIA686A_REG_ALARM2) << 8);
793 data->last_updated = jiffies;
797 up(&data->update_lock);
802 static struct pci_device_id via686a_pci_ids[] = {
803 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_4) },
807 MODULE_DEVICE_TABLE(pci, via686a_pci_ids);
809 static int __devinit via686a_pci_probe(struct pci_dev *dev,
810 const struct pci_device_id *id)
815 if (PCIBIOS_SUCCESSFUL !=
816 pci_read_config_word(dev, VIA686A_BASE_REG, &val))
819 addr = val & ~(VIA686A_EXTENT - 1);
820 if (addr == 0 && force_addr == 0) {
821 dev_err(&dev->dev,"base address not set - upgrade BIOS or use force_addr=0xaddr\n");
825 addr = force_addr; /* so detect will get called */
828 dev_err(&dev->dev,"No Via 686A sensors found.\n");
831 normal_isa[0] = addr;
833 s_bridge = pci_dev_get(dev);
834 if (i2c_add_driver(&via686a_driver)) {
835 pci_dev_put(s_bridge);
839 /* Always return failure here. This is to allow other drivers to bind
840 * to this pci device. We don't really want to have control over the
841 * pci device, we only wanted to read as few register values from it.
846 static struct pci_driver via686a_pci_driver = {
848 .id_table = via686a_pci_ids,
849 .probe = via686a_pci_probe,
852 static int __init sm_via686a_init(void)
854 return pci_register_driver(&via686a_pci_driver);
857 static void __exit sm_via686a_exit(void)
859 pci_unregister_driver(&via686a_pci_driver);
860 if (s_bridge != NULL) {
861 i2c_del_driver(&via686a_driver);
862 pci_dev_put(s_bridge);
867 MODULE_AUTHOR("Kyösti Mälkki <kmalkki@cc.hut.fi>, "
868 "Mark Studebaker <mdsxyz123@yahoo.com> "
869 "and Bob Dougherty <bobd@stanford.edu>");
870 MODULE_DESCRIPTION("VIA 686A Sensor device");
871 MODULE_LICENSE("GPL");
873 module_init(sm_via686a_init);
874 module_exit(sm_via686a_exit);