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/i2c-sensor.h>
40 #include <linux/hwmon.h>
41 #include <linux/err.h>
42 #include <linux/init.h>
46 /* If force_addr is set to anything different from 0, we forcibly enable
47 the device at the given address. */
48 static unsigned short force_addr = 0;
49 module_param(force_addr, ushort, 0);
50 MODULE_PARM_DESC(force_addr,
51 "Initialize the base address of the sensors");
54 Note that we can't determine the ISA address until we have initialized
56 static unsigned short normal_i2c[] = { I2C_CLIENT_END };
57 static unsigned int normal_isa[] = { 0x0000, I2C_CLIENT_ISA_END };
59 /* Insmod parameters */
60 SENSORS_INSMOD_1(via686a);
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
67 /* Many VIA686A constants specified below */
69 /* Length of ISA address segment */
70 #define VIA686A_EXTENT 0x80
71 #define VIA686A_BASE_REG 0x70
72 #define VIA686A_ENABLE_REG 0x74
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))
80 /* fans numbered 1-2 */
81 #define VIA686A_REG_FAN_MIN(nr) (0x3a + (nr))
82 #define VIA686A_REG_FAN(nr) (0x28 + (nr))
84 /* temps numbered 1-3 */
85 static const u8 VIA686A_REG_TEMP[] = { 0x20, 0x21, 0x1f };
86 static const u8 VIA686A_REG_TEMP_OVER[] = { 0x39, 0x3d, 0x1d };
87 static const u8 VIA686A_REG_TEMP_HYST[] = { 0x3a, 0x3e, 0x1e };
89 #define VIA686A_REG_TEMP_LOW1 0x4b
90 /* 2 = bits 5-4, 3 = bits 7-6 */
91 #define VIA686A_REG_TEMP_LOW23 0x49
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 provide 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 class_device *class_dev;
304 struct semaphore update_lock;
305 char valid; /* !=0 if following fields are valid */
306 unsigned long last_updated; /* In jiffies */
308 u8 in[5]; /* Register value */
309 u8 in_max[5]; /* Register value */
310 u8 in_min[5]; /* Register value */
311 u8 fan[2]; /* Register value */
312 u8 fan_min[2]; /* Register value */
313 u16 temp[3]; /* Register value 10 bit */
314 u8 temp_over[3]; /* Register value */
315 u8 temp_hyst[3]; /* Register value */
316 u8 fan_div[2]; /* Register encoding, shifted right */
317 u16 alarms; /* Register encoding, combined */
320 static struct pci_dev *s_bridge; /* pointer to the (only) via686a */
322 static int via686a_attach_adapter(struct i2c_adapter *adapter);
323 static int via686a_detect(struct i2c_adapter *adapter, int address, int kind);
324 static int via686a_detach_client(struct i2c_client *client);
326 static inline int via686a_read_value(struct i2c_client *client, u8 reg)
328 return (inb_p(client->addr + reg));
331 static inline void via686a_write_value(struct i2c_client *client, u8 reg,
334 outb_p(value, client->addr + reg);
337 static struct via686a_data *via686a_update_device(struct device *dev);
338 static void via686a_init_client(struct i2c_client *client);
340 /* following are the sysfs callback functions */
342 /* 7 voltage sensors */
343 static ssize_t show_in(struct device *dev, char *buf, int nr) {
344 struct via686a_data *data = via686a_update_device(dev);
345 return sprintf(buf, "%ld\n", IN_FROM_REG(data->in[nr], nr));
348 static ssize_t show_in_min(struct device *dev, char *buf, int nr) {
349 struct via686a_data *data = via686a_update_device(dev);
350 return sprintf(buf, "%ld\n", IN_FROM_REG(data->in_min[nr], nr));
353 static ssize_t show_in_max(struct device *dev, char *buf, int nr) {
354 struct via686a_data *data = via686a_update_device(dev);
355 return sprintf(buf, "%ld\n", IN_FROM_REG(data->in_max[nr], nr));
358 static ssize_t set_in_min(struct device *dev, const char *buf,
359 size_t count, int nr) {
360 struct i2c_client *client = to_i2c_client(dev);
361 struct via686a_data *data = i2c_get_clientdata(client);
362 unsigned long val = simple_strtoul(buf, NULL, 10);
364 down(&data->update_lock);
365 data->in_min[nr] = IN_TO_REG(val, nr);
366 via686a_write_value(client, VIA686A_REG_IN_MIN(nr),
368 up(&data->update_lock);
371 static ssize_t set_in_max(struct device *dev, const char *buf,
372 size_t count, int nr) {
373 struct i2c_client *client = to_i2c_client(dev);
374 struct via686a_data *data = i2c_get_clientdata(client);
375 unsigned long val = simple_strtoul(buf, NULL, 10);
377 down(&data->update_lock);
378 data->in_max[nr] = IN_TO_REG(val, nr);
379 via686a_write_value(client, VIA686A_REG_IN_MAX(nr),
381 up(&data->update_lock);
384 #define show_in_offset(offset) \
386 show_in##offset (struct device *dev, struct device_attribute *attr, char *buf) \
388 return show_in(dev, buf, offset); \
391 show_in##offset##_min (struct device *dev, struct device_attribute *attr, char *buf) \
393 return show_in_min(dev, buf, offset); \
396 show_in##offset##_max (struct device *dev, struct device_attribute *attr, char *buf) \
398 return show_in_max(dev, buf, offset); \
400 static ssize_t set_in##offset##_min (struct device *dev, struct device_attribute *attr, \
401 const char *buf, size_t count) \
403 return set_in_min(dev, buf, count, offset); \
405 static ssize_t set_in##offset##_max (struct device *dev, struct device_attribute *attr, \
406 const char *buf, size_t count) \
408 return set_in_max(dev, buf, count, offset); \
410 static DEVICE_ATTR(in##offset##_input, S_IRUGO, show_in##offset, NULL);\
411 static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
412 show_in##offset##_min, set_in##offset##_min); \
413 static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
414 show_in##offset##_max, set_in##offset##_max);
423 static ssize_t show_temp(struct device *dev, char *buf, int nr) {
424 struct via686a_data *data = via686a_update_device(dev);
425 return sprintf(buf, "%ld\n", TEMP_FROM_REG10(data->temp[nr]));
427 static ssize_t show_temp_over(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_over[nr]));
431 static ssize_t show_temp_hyst(struct device *dev, char *buf, int nr) {
432 struct via686a_data *data = via686a_update_device(dev);
433 return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp_hyst[nr]));
435 static ssize_t set_temp_over(struct device *dev, const char *buf,
436 size_t count, int nr) {
437 struct i2c_client *client = to_i2c_client(dev);
438 struct via686a_data *data = i2c_get_clientdata(client);
439 int val = simple_strtol(buf, NULL, 10);
441 down(&data->update_lock);
442 data->temp_over[nr] = TEMP_TO_REG(val);
443 via686a_write_value(client, VIA686A_REG_TEMP_OVER[nr],
444 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],
457 data->temp_hyst[nr]);
458 up(&data->update_lock);
461 #define show_temp_offset(offset) \
462 static ssize_t show_temp_##offset (struct device *dev, struct device_attribute *attr, char *buf) \
464 return show_temp(dev, buf, offset - 1); \
467 show_temp_##offset##_over (struct device *dev, struct device_attribute *attr, char *buf) \
469 return show_temp_over(dev, buf, offset - 1); \
472 show_temp_##offset##_hyst (struct device *dev, struct device_attribute *attr, char *buf) \
474 return show_temp_hyst(dev, buf, offset - 1); \
476 static ssize_t set_temp_##offset##_over (struct device *dev, struct device_attribute *attr, \
477 const char *buf, size_t count) \
479 return set_temp_over(dev, buf, count, offset - 1); \
481 static ssize_t set_temp_##offset##_hyst (struct device *dev, struct device_attribute *attr, \
482 const char *buf, size_t count) \
484 return set_temp_hyst(dev, buf, count, offset - 1); \
486 static DEVICE_ATTR(temp##offset##_input, S_IRUGO, show_temp_##offset, NULL);\
487 static DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
488 show_temp_##offset##_over, set_temp_##offset##_over); \
489 static DEVICE_ATTR(temp##offset##_max_hyst, S_IRUGO | S_IWUSR, \
490 show_temp_##offset##_hyst, set_temp_##offset##_hyst);
497 static ssize_t show_fan(struct device *dev, char *buf, int nr) {
498 struct via686a_data *data = via686a_update_device(dev);
499 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
500 DIV_FROM_REG(data->fan_div[nr])) );
502 static ssize_t show_fan_min(struct device *dev, char *buf, int nr) {
503 struct via686a_data *data = via686a_update_device(dev);
504 return sprintf(buf, "%d\n",
505 FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr])) );
507 static ssize_t show_fan_div(struct device *dev, char *buf, int nr) {
508 struct via686a_data *data = via686a_update_device(dev);
509 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]) );
511 static ssize_t set_fan_min(struct device *dev, const char *buf,
512 size_t count, int nr) {
513 struct i2c_client *client = to_i2c_client(dev);
514 struct via686a_data *data = i2c_get_clientdata(client);
515 int val = simple_strtol(buf, NULL, 10);
517 down(&data->update_lock);
518 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
519 via686a_write_value(client, VIA686A_REG_FAN_MIN(nr+1), data->fan_min[nr]);
520 up(&data->update_lock);
523 static ssize_t set_fan_div(struct device *dev, const char *buf,
524 size_t count, int nr) {
525 struct i2c_client *client = to_i2c_client(dev);
526 struct via686a_data *data = i2c_get_clientdata(client);
527 int val = simple_strtol(buf, NULL, 10);
530 down(&data->update_lock);
531 old = via686a_read_value(client, VIA686A_REG_FANDIV);
532 data->fan_div[nr] = DIV_TO_REG(val);
533 old = (old & 0x0f) | (data->fan_div[1] << 6) | (data->fan_div[0] << 4);
534 via686a_write_value(client, VIA686A_REG_FANDIV, old);
535 up(&data->update_lock);
539 #define show_fan_offset(offset) \
540 static ssize_t show_fan_##offset (struct device *dev, struct device_attribute *attr, char *buf) \
542 return show_fan(dev, buf, offset - 1); \
544 static ssize_t show_fan_##offset##_min (struct device *dev, struct device_attribute *attr, char *buf) \
546 return show_fan_min(dev, buf, offset - 1); \
548 static ssize_t show_fan_##offset##_div (struct device *dev, struct device_attribute *attr, char *buf) \
550 return show_fan_div(dev, buf, offset - 1); \
552 static ssize_t set_fan_##offset##_min (struct device *dev, struct device_attribute *attr, \
553 const char *buf, size_t count) \
555 return set_fan_min(dev, buf, count, offset - 1); \
557 static ssize_t set_fan_##offset##_div (struct device *dev, struct device_attribute *attr, \
558 const char *buf, size_t count) \
560 return set_fan_div(dev, buf, count, offset - 1); \
562 static DEVICE_ATTR(fan##offset##_input, S_IRUGO, show_fan_##offset, NULL);\
563 static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
564 show_fan_##offset##_min, set_fan_##offset##_min); \
565 static DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
566 show_fan_##offset##_div, set_fan_##offset##_div);
572 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf) {
573 struct via686a_data *data = via686a_update_device(dev);
574 return sprintf(buf, "%u\n", data->alarms);
576 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
578 /* The driver. I choose to use type i2c_driver, as at is identical to both
579 smbus_driver and isa_driver, and clients could be of either kind */
580 static struct i2c_driver via686a_driver = {
581 .owner = THIS_MODULE,
583 .id = I2C_DRIVERID_VIA686A,
584 .flags = I2C_DF_NOTIFY,
585 .attach_adapter = via686a_attach_adapter,
586 .detach_client = via686a_detach_client,
590 /* This is called when the module is loaded */
591 static int via686a_attach_adapter(struct i2c_adapter *adapter)
593 if (!(adapter->class & I2C_CLASS_HWMON))
595 return i2c_detect(adapter, &addr_data, via686a_detect);
598 static int via686a_detect(struct i2c_adapter *adapter, int address, int kind)
600 struct i2c_client *new_client;
601 struct via686a_data *data;
603 const char client_name[] = "via686a";
606 /* Make sure we are probing the ISA bus!! */
607 if (!i2c_is_isa_adapter(adapter)) {
608 dev_err(&adapter->dev,
609 "via686a_detect called for an I2C bus adapter?!?\n");
613 /* 8231 requires multiple of 256, we enforce that on 686 as well */
615 address = force_addr & 0xFF00;
618 dev_warn(&adapter->dev, "forcing ISA address 0x%04X\n",
620 if (PCIBIOS_SUCCESSFUL !=
621 pci_write_config_word(s_bridge, VIA686A_BASE_REG, address))
624 if (PCIBIOS_SUCCESSFUL !=
625 pci_read_config_word(s_bridge, VIA686A_ENABLE_REG, &val))
627 if (!(val & 0x0001)) {
628 dev_warn(&adapter->dev, "enabling sensors\n");
629 if (PCIBIOS_SUCCESSFUL !=
630 pci_write_config_word(s_bridge, VIA686A_ENABLE_REG,
635 /* Reserve the ISA region */
636 if (!request_region(address, VIA686A_EXTENT, via686a_driver.name)) {
637 dev_err(&adapter->dev, "region 0x%x already in use!\n",
642 if (!(data = kmalloc(sizeof(struct via686a_data), GFP_KERNEL))) {
646 memset(data, 0, sizeof(struct via686a_data));
648 new_client = &data->client;
649 i2c_set_clientdata(new_client, data);
650 new_client->addr = address;
651 new_client->adapter = adapter;
652 new_client->driver = &via686a_driver;
653 new_client->flags = 0;
655 /* Fill in the remaining client fields and put into the global list */
656 strlcpy(new_client->name, client_name, I2C_NAME_SIZE);
659 init_MUTEX(&data->update_lock);
660 /* Tell the I2C layer a new client has arrived */
661 if ((err = i2c_attach_client(new_client)))
664 /* Initialize the VIA686A chip */
665 via686a_init_client(new_client);
667 /* Register sysfs hooks */
668 data->class_dev = hwmon_device_register(&new_client->dev);
669 if (IS_ERR(data->class_dev)) {
670 err = PTR_ERR(data->class_dev);
674 device_create_file(&new_client->dev, &dev_attr_in0_input);
675 device_create_file(&new_client->dev, &dev_attr_in1_input);
676 device_create_file(&new_client->dev, &dev_attr_in2_input);
677 device_create_file(&new_client->dev, &dev_attr_in3_input);
678 device_create_file(&new_client->dev, &dev_attr_in4_input);
679 device_create_file(&new_client->dev, &dev_attr_in0_min);
680 device_create_file(&new_client->dev, &dev_attr_in1_min);
681 device_create_file(&new_client->dev, &dev_attr_in2_min);
682 device_create_file(&new_client->dev, &dev_attr_in3_min);
683 device_create_file(&new_client->dev, &dev_attr_in4_min);
684 device_create_file(&new_client->dev, &dev_attr_in0_max);
685 device_create_file(&new_client->dev, &dev_attr_in1_max);
686 device_create_file(&new_client->dev, &dev_attr_in2_max);
687 device_create_file(&new_client->dev, &dev_attr_in3_max);
688 device_create_file(&new_client->dev, &dev_attr_in4_max);
689 device_create_file(&new_client->dev, &dev_attr_temp1_input);
690 device_create_file(&new_client->dev, &dev_attr_temp2_input);
691 device_create_file(&new_client->dev, &dev_attr_temp3_input);
692 device_create_file(&new_client->dev, &dev_attr_temp1_max);
693 device_create_file(&new_client->dev, &dev_attr_temp2_max);
694 device_create_file(&new_client->dev, &dev_attr_temp3_max);
695 device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst);
696 device_create_file(&new_client->dev, &dev_attr_temp2_max_hyst);
697 device_create_file(&new_client->dev, &dev_attr_temp3_max_hyst);
698 device_create_file(&new_client->dev, &dev_attr_fan1_input);
699 device_create_file(&new_client->dev, &dev_attr_fan2_input);
700 device_create_file(&new_client->dev, &dev_attr_fan1_min);
701 device_create_file(&new_client->dev, &dev_attr_fan2_min);
702 device_create_file(&new_client->dev, &dev_attr_fan1_div);
703 device_create_file(&new_client->dev, &dev_attr_fan2_div);
704 device_create_file(&new_client->dev, &dev_attr_alarms);
709 i2c_detach_client(new_client);
713 release_region(address, VIA686A_EXTENT);
717 static int via686a_detach_client(struct i2c_client *client)
719 struct via686a_data *data = i2c_get_clientdata(client);
722 hwmon_device_unregister(data->class_dev);
724 if ((err = i2c_detach_client(client))) {
725 dev_err(&client->dev,
726 "Client deregistration failed, client not detached.\n");
730 release_region(client->addr, VIA686A_EXTENT);
736 /* Called when we have found a new VIA686A. Set limits, etc. */
737 static void via686a_init_client(struct i2c_client *client)
741 /* Start monitoring */
742 reg = via686a_read_value(client, VIA686A_REG_CONFIG);
743 via686a_write_value(client, VIA686A_REG_CONFIG, (reg|0x01)&0x7F);
745 /* Configure temp interrupt mode for continuous-interrupt operation */
746 via686a_write_value(client, VIA686A_REG_TEMP_MODE,
747 via686a_read_value(client, VIA686A_REG_TEMP_MODE) &
748 !(VIA686A_TEMP_MODE_MASK | VIA686A_TEMP_MODE_CONTINUOUS));
751 static struct via686a_data *via686a_update_device(struct device *dev)
753 struct i2c_client *client = to_i2c_client(dev);
754 struct via686a_data *data = i2c_get_clientdata(client);
757 down(&data->update_lock);
759 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
761 for (i = 0; i <= 4; i++) {
763 via686a_read_value(client, VIA686A_REG_IN(i));
764 data->in_min[i] = via686a_read_value(client,
768 via686a_read_value(client, VIA686A_REG_IN_MAX(i));
770 for (i = 1; i <= 2; i++) {
772 via686a_read_value(client, VIA686A_REG_FAN(i));
773 data->fan_min[i - 1] = via686a_read_value(client,
774 VIA686A_REG_FAN_MIN(i));
776 for (i = 0; i <= 2; i++) {
777 data->temp[i] = via686a_read_value(client,
778 VIA686A_REG_TEMP[i]) << 2;
780 via686a_read_value(client,
781 VIA686A_REG_TEMP_OVER[i]);
783 via686a_read_value(client,
784 VIA686A_REG_TEMP_HYST[i]);
786 /* add in lower 2 bits
787 temp1 uses bits 7-6 of VIA686A_REG_TEMP_LOW1
788 temp2 uses bits 5-4 of VIA686A_REG_TEMP_LOW23
789 temp3 uses bits 7-6 of VIA686A_REG_TEMP_LOW23
791 data->temp[0] |= (via686a_read_value(client,
792 VIA686A_REG_TEMP_LOW1)
795 (via686a_read_value(client, VIA686A_REG_TEMP_LOW23) &
798 (via686a_read_value(client, VIA686A_REG_TEMP_LOW23) &
801 i = via686a_read_value(client, VIA686A_REG_FANDIV);
802 data->fan_div[0] = (i >> 4) & 0x03;
803 data->fan_div[1] = i >> 6;
805 via686a_read_value(client,
806 VIA686A_REG_ALARM1) |
807 (via686a_read_value(client, VIA686A_REG_ALARM2) << 8);
808 data->last_updated = jiffies;
812 up(&data->update_lock);
817 static struct pci_device_id via686a_pci_ids[] = {
818 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_4) },
822 MODULE_DEVICE_TABLE(pci, via686a_pci_ids);
824 static int __devinit via686a_pci_probe(struct pci_dev *dev,
825 const struct pci_device_id *id)
830 if (PCIBIOS_SUCCESSFUL !=
831 pci_read_config_word(dev, VIA686A_BASE_REG, &val))
834 addr = val & ~(VIA686A_EXTENT - 1);
835 if (addr == 0 && force_addr == 0) {
836 dev_err(&dev->dev, "base address not set - upgrade BIOS "
837 "or use force_addr=0xaddr\n");
841 addr = force_addr; /* so detect will get called */
844 dev_err(&dev->dev, "No Via 686A sensors found.\n");
847 normal_isa[0] = addr;
849 s_bridge = pci_dev_get(dev);
850 if (i2c_isa_add_driver(&via686a_driver)) {
851 pci_dev_put(s_bridge);
855 /* Always return failure here. This is to allow other drivers to bind
856 * to this pci device. We don't really want to have control over the
857 * pci device, we only wanted to read as few register values from it.
862 static struct pci_driver via686a_pci_driver = {
864 .id_table = via686a_pci_ids,
865 .probe = via686a_pci_probe,
868 static int __init sm_via686a_init(void)
870 return pci_register_driver(&via686a_pci_driver);
873 static void __exit sm_via686a_exit(void)
875 pci_unregister_driver(&via686a_pci_driver);
876 if (s_bridge != NULL) {
877 i2c_isa_del_driver(&via686a_driver);
878 pci_dev_put(s_bridge);
883 MODULE_AUTHOR("Kyösti Mälkki <kmalkki@cc.hut.fi>, "
884 "Mark Studebaker <mdsxyz123@yahoo.com> "
885 "and Bob Dougherty <bobd@stanford.edu>");
886 MODULE_DESCRIPTION("VIA 686A Sensor device");
887 MODULE_LICENSE("GPL");
889 module_init(sm_via686a_init);
890 module_exit(sm_via686a_exit);