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Linux 2.6.16.22
[linux/fpc-iii.git] / drivers / hwmon / via686a.c
blobcb01848729b5e2760805c106bd7182fef28120a4
1 /*
2 via686a.c - Part of lm_sensors, Linux kernel modules
3 for hardware monitoring
4
5 Copyright (c) 1998 - 2002 Frodo Looijaard <frodol@dds.nl>,
6 Kyösti Mälkki <kmalkki@cc.hut.fi>,
7 Mark Studebaker <mdsxyz123@yahoo.com>,
8 and Bob Dougherty <bobd@stanford.edu>
9 (Some conversion-factor data were contributed by Jonathan Teh Soon Yew
10 <j.teh@iname.com> and Alex van Kaam <darkside@chello.nl>.)
11
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.
16
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.
21
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.
25 */
26
27 /*
28 Supports the Via VT82C686A, VT82C686B south bridges.
29 Reports all as a 686A.
30 Warning - only supports a single device.
31 */
32
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 <asm/io.h>
43
44
45 /* If force_addr is set to anything different from 0, we forcibly enable
46 the device at the given address. */
47 static unsigned short force_addr;
48 module_param(force_addr, ushort, 0);
49 MODULE_PARM_DESC(force_addr,
50 "Initialize the base address of the sensors");
51
52 /* Device address
53 Note that we can't determine the ISA address until we have initialized
54 our module */
55 static unsigned short address;
56
57 /*
58 The Via 686a southbridge has a LM78-like chip integrated on the same IC.
59 This driver is a customized copy of lm78.c
60 */
61
62 /* Many VIA686A constants specified below */
63
64 /* Length of ISA address segment */
65 #define VIA686A_EXTENT 0x80
66 #define VIA686A_BASE_REG 0x70
67 #define VIA686A_ENABLE_REG 0x74
68
69 /* The VIA686A registers */
70 /* ins numbered 0-4 */
71 #define VIA686A_REG_IN_MAX(nr) (0x2b + ((nr) * 2))
72 #define VIA686A_REG_IN_MIN(nr) (0x2c + ((nr) * 2))
73 #define VIA686A_REG_IN(nr) (0x22 + (nr))
74
75 /* fans numbered 1-2 */
76 #define VIA686A_REG_FAN_MIN(nr) (0x3a + (nr))
77 #define VIA686A_REG_FAN(nr) (0x28 + (nr))
78
79 /* temps numbered 1-3 */
80 static const u8 VIA686A_REG_TEMP[] = { 0x20, 0x21, 0x1f };
81 static const u8 VIA686A_REG_TEMP_OVER[] = { 0x39, 0x3d, 0x1d };
82 static const u8 VIA686A_REG_TEMP_HYST[] = { 0x3a, 0x3e, 0x1e };
83 /* bits 7-6 */
84 #define VIA686A_REG_TEMP_LOW1 0x4b
85 /* 2 = bits 5-4, 3 = bits 7-6 */
86 #define VIA686A_REG_TEMP_LOW23 0x49
87
88 #define VIA686A_REG_ALARM1 0x41
89 #define VIA686A_REG_ALARM2 0x42
90 #define VIA686A_REG_FANDIV 0x47
91 #define VIA686A_REG_CONFIG 0x40
92 /* The following register sets temp interrupt mode (bits 1-0 for temp1,
93 3-2 for temp2, 5-4 for temp3). Modes are:
94 00 interrupt stays as long as value is out-of-range
95 01 interrupt is cleared once register is read (default)
96 10 comparator mode- like 00, but ignores hysteresis
97 11 same as 00 */
98 #define VIA686A_REG_TEMP_MODE 0x4b
99 /* We'll just assume that you want to set all 3 simultaneously: */
100 #define VIA686A_TEMP_MODE_MASK 0x3F
101 #define VIA686A_TEMP_MODE_CONTINUOUS 0x00
102
103 /* Conversions. Limit checking is only done on the TO_REG
104 variants.
105
106 ********* VOLTAGE CONVERSIONS (Bob Dougherty) ********
107 From HWMon.cpp (Copyright 1998-2000 Jonathan Teh Soon Yew):
108 voltagefactor[0]=1.25/2628; (2628/1.25=2102.4) // Vccp
109 voltagefactor[1]=1.25/2628; (2628/1.25=2102.4) // +2.5V
110 voltagefactor[2]=1.67/2628; (2628/1.67=1573.7) // +3.3V
111 voltagefactor[3]=2.6/2628; (2628/2.60=1010.8) // +5V
112 voltagefactor[4]=6.3/2628; (2628/6.30=417.14) // +12V
113 in[i]=(data[i+2]*25.0+133)*voltagefactor[i];
114 That is:
115 volts = (25*regVal+133)*factor
116 regVal = (volts/factor-133)/25
117 (These conversions were contributed by Jonathan Teh Soon Yew
118 <j.teh@iname.com>) */
119 static inline u8 IN_TO_REG(long val, int inNum)
120 {
121 /* To avoid floating point, we multiply constants by 10 (100 for +12V).
122 Rounding is done (120500 is actually 133000 - 12500).
123 Remember that val is expressed in 0.001V/bit, which is why we divide
124 by an additional 10000 (100000 for +12V): 1000 for val and 10 (100)
125 for the constants. */
126 if (inNum <= 1)
127 return (u8)
128 SENSORS_LIMIT((val * 21024 - 1205000) / 250000, 0, 255);
129 else if (inNum == 2)
130 return (u8)
131 SENSORS_LIMIT((val * 15737 - 1205000) / 250000, 0, 255);
132 else if (inNum == 3)
133 return (u8)
134 SENSORS_LIMIT((val * 10108 - 1205000) / 250000, 0, 255);
135 else
136 return (u8)
137 SENSORS_LIMIT((val * 41714 - 12050000) / 2500000, 0, 255);
138 }
139
140 static inline long IN_FROM_REG(u8 val, int inNum)
141 {
142 /* To avoid floating point, we multiply constants by 10 (100 for +12V).
143 We also multiply them by 1000 because we want 0.001V/bit for the
144 output value. Rounding is done. */
145 if (inNum <= 1)
146 return (long) ((250000 * val + 1330000 + 21024 / 2) / 21024);
147 else if (inNum == 2)
148 return (long) ((250000 * val + 1330000 + 15737 / 2) / 15737);
149 else if (inNum == 3)
150 return (long) ((250000 * val + 1330000 + 10108 / 2) / 10108);
151 else
152 return (long) ((2500000 * val + 13300000 + 41714 / 2) / 41714);
153 }
154
155 /********* FAN RPM CONVERSIONS ********/
156 /* Higher register values = slower fans (the fan's strobe gates a counter).
157 But this chip saturates back at 0, not at 255 like all the other chips.
158 So, 0 means 0 RPM */
159 static inline u8 FAN_TO_REG(long rpm, int div)
160 {
161 if (rpm == 0)
162 return 0;
163 rpm = SENSORS_LIMIT(rpm, 1, 1000000);
164 return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 255);
165 }
166
167 #define FAN_FROM_REG(val,div) ((val)==0?0:(val)==255?0:1350000/((val)*(div)))
168
169 /******** TEMP CONVERSIONS (Bob Dougherty) *********/
170 /* linear fits from HWMon.cpp (Copyright 1998-2000 Jonathan Teh Soon Yew)
171 if(temp<169)
172 return double(temp)*0.427-32.08;
173 else if(temp>=169 && temp<=202)
174 return double(temp)*0.582-58.16;
175 else
176 return double(temp)*0.924-127.33;
177
178 A fifth-order polynomial fits the unofficial data (provided by Alex van
179 Kaam <darkside@chello.nl>) a bit better. It also give more reasonable
180 numbers on my machine (ie. they agree with what my BIOS tells me).
181 Here's the fifth-order fit to the 8-bit data:
182 temp = 1.625093e-10*val^5 - 1.001632e-07*val^4 + 2.457653e-05*val^3 -
183 2.967619e-03*val^2 + 2.175144e-01*val - 7.090067e+0.
184
185 (2000-10-25- RFD: thanks to Uwe Andersen <uandersen@mayah.com> for
186 finding my typos in this formula!)
187
188 Alas, none of the elegant function-fit solutions will work because we
189 aren't allowed to use floating point in the kernel and doing it with
190 integers doesn't provide enough precision. So we'll do boring old
191 look-up table stuff. The unofficial data (see below) have effectively
192 7-bit resolution (they are rounded to the nearest degree). I'm assuming
193 that the transfer function of the device is monotonic and smooth, so a
194 smooth function fit to the data will allow us to get better precision.
195 I used the 5th-order poly fit described above and solved for
196 VIA register values 0-255. I *10 before rounding, so we get tenth-degree
197 precision. (I could have done all 1024 values for our 10-bit readings,
198 but the function is very linear in the useful range (0-80 deg C), so
199 we'll just use linear interpolation for 10-bit readings.) So, tempLUT
200 is the temp at via register values 0-255: */
201 static const s16 tempLUT[] =
202 { -709, -688, -667, -646, -627, -607, -589, -570, -553, -536, -519,
203 -503, -487, -471, -456, -442, -428, -414, -400, -387, -375,
204 -362, -350, -339, -327, -316, -305, -295, -285, -275, -265,
205 -255, -246, -237, -229, -220, -212, -204, -196, -188, -180,
206 -173, -166, -159, -152, -145, -139, -132, -126, -120, -114,
207 -108, -102, -96, -91, -85, -80, -74, -69, -64, -59, -54, -49,
208 -44, -39, -34, -29, -25, -20, -15, -11, -6, -2, 3, 7, 12, 16,
209 20, 25, 29, 33, 37, 42, 46, 50, 54, 59, 63, 67, 71, 75, 79, 84,
210 88, 92, 96, 100, 104, 109, 113, 117, 121, 125, 130, 134, 138,
211 142, 146, 151, 155, 159, 163, 168, 172, 176, 181, 185, 189,
212 193, 198, 202, 206, 211, 215, 219, 224, 228, 232, 237, 241,
213 245, 250, 254, 259, 263, 267, 272, 276, 281, 285, 290, 294,
214 299, 303, 307, 312, 316, 321, 325, 330, 334, 339, 344, 348,
215 353, 357, 362, 366, 371, 376, 380, 385, 390, 395, 399, 404,
216 409, 414, 419, 423, 428, 433, 438, 443, 449, 454, 459, 464,
217 469, 475, 480, 486, 491, 497, 502, 508, 514, 520, 526, 532,
218 538, 544, 551, 557, 564, 571, 578, 584, 592, 599, 606, 614,
219 621, 629, 637, 645, 654, 662, 671, 680, 689, 698, 708, 718,
220 728, 738, 749, 759, 770, 782, 793, 805, 818, 830, 843, 856,
221 870, 883, 898, 912, 927, 943, 958, 975, 991, 1008, 1026, 1044,
222 1062, 1081, 1101, 1121, 1141, 1162, 1184, 1206, 1229, 1252,
223 1276, 1301, 1326, 1352, 1378, 1406, 1434, 1462
224 };
225
226 /* the original LUT values from Alex van Kaam <darkside@chello.nl>
227 (for via register values 12-240):
228 {-50,-49,-47,-45,-43,-41,-39,-38,-37,-35,-34,-33,-32,-31,
229 -30,-29,-28,-27,-26,-25,-24,-24,-23,-22,-21,-20,-20,-19,-18,-17,-17,-16,-15,
230 -15,-14,-14,-13,-12,-12,-11,-11,-10,-9,-9,-8,-8,-7,-7,-6,-6,-5,-5,-4,-4,-3,
231 -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,
232 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,
233 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,
234 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,
235 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,
236 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,
237 85,86,88,89,91,92,94,96,97,99,101,103,105,107,109,110};
238
239
240 Here's the reverse LUT. I got it by doing a 6-th order poly fit (needed
241 an extra term for a good fit to these inverse data!) and then
242 solving for each temp value from -50 to 110 (the useable range for
243 this chip). Here's the fit:
244 viaRegVal = -1.160370e-10*val^6 +3.193693e-08*val^5 - 1.464447e-06*val^4
245 - 2.525453e-04*val^3 + 1.424593e-02*val^2 + 2.148941e+00*val +7.275808e+01)
246 Note that n=161: */
247 static const u8 viaLUT[] =
248 { 12, 12, 13, 14, 14, 15, 16, 16, 17, 18, 18, 19, 20, 20, 21, 22, 23,
249 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 35, 36, 37, 39, 40,
250 41, 43, 45, 46, 48, 49, 51, 53, 55, 57, 59, 60, 62, 64, 66,
251 69, 71, 73, 75, 77, 79, 82, 84, 86, 88, 91, 93, 95, 98, 100,
252 103, 105, 107, 110, 112, 115, 117, 119, 122, 124, 126, 129,
253 131, 134, 136, 138, 140, 143, 145, 147, 150, 152, 154, 156,
254 158, 160, 162, 164, 166, 168, 170, 172, 174, 176, 178, 180,
255 182, 183, 185, 187, 188, 190, 192, 193, 195, 196, 198, 199,
256 200, 202, 203, 205, 206, 207, 208, 209, 210, 211, 212, 213,
257 214, 215, 216, 217, 218, 219, 220, 221, 222, 222, 223, 224,
258 225, 226, 226, 227, 228, 228, 229, 230, 230, 231, 232, 232,
259 233, 233, 234, 235, 235, 236, 236, 237, 237, 238, 238, 239,
260 239, 240
261 };
262
263 /* Converting temps to (8-bit) hyst and over registers
264 No interpolation here.
265 The +50 is because the temps start at -50 */
266 static inline u8 TEMP_TO_REG(long val)
267 {
268 return viaLUT[val <= -50000 ? 0 : val >= 110000 ? 160 :
269 (val < 0 ? val - 500 : val + 500) / 1000 + 50];
270 }
271
272 /* for 8-bit temperature hyst and over registers */
273 #define TEMP_FROM_REG(val) ((long)tempLUT[val] * 100)
274
275 /* for 10-bit temperature readings */
276 static inline long TEMP_FROM_REG10(u16 val)
277 {
278 u16 eightBits = val >> 2;
279 u16 twoBits = val & 3;
280
281 /* no interpolation for these */
282 if (twoBits == 0 || eightBits == 255)
283 return TEMP_FROM_REG(eightBits);
284
285 /* do some linear interpolation */
286 return (tempLUT[eightBits] * (4 - twoBits) +
287 tempLUT[eightBits + 1] * twoBits) * 25;
288 }
289
290 #define DIV_FROM_REG(val) (1 << (val))
291 #define DIV_TO_REG(val) ((val)==8?3:(val)==4?2:(val)==1?0:1)
292
293 /* For the VIA686A, we need to keep some data in memory.
294 The structure is dynamically allocated, at the same time when a new
295 via686a client is allocated. */
296 struct via686a_data {
297 struct i2c_client client;
298 struct class_device *class_dev;
299 struct semaphore update_lock;
300 char valid; /* !=0 if following fields are valid */
301 unsigned long last_updated; /* In jiffies */
302
303 u8 in[5]; /* Register value */
304 u8 in_max[5]; /* Register value */
305 u8 in_min[5]; /* Register value */
306 u8 fan[2]; /* Register value */
307 u8 fan_min[2]; /* Register value */
308 u16 temp[3]; /* Register value 10 bit */
309 u8 temp_over[3]; /* Register value */
310 u8 temp_hyst[3]; /* Register value */
311 u8 fan_div[2]; /* Register encoding, shifted right */
312 u16 alarms; /* Register encoding, combined */
313 };
314
315 static struct pci_dev *s_bridge; /* pointer to the (only) via686a */
316
317 static int via686a_detect(struct i2c_adapter *adapter);
318 static int via686a_detach_client(struct i2c_client *client);
319
320 static inline int via686a_read_value(struct i2c_client *client, u8 reg)
321 {
322 return (inb_p(client->addr + reg));
323 }
324
325 static inline void via686a_write_value(struct i2c_client *client, u8 reg,
326 u8 value)
327 {
328 outb_p(value, client->addr + reg);
329 }
330
331 static struct via686a_data *via686a_update_device(struct device *dev);
332 static void via686a_init_client(struct i2c_client *client);
333
334 /* following are the sysfs callback functions */
335
336 /* 7 voltage sensors */
337 static ssize_t show_in(struct device *dev, char *buf, int nr) {
338 struct via686a_data *data = via686a_update_device(dev);
339 return sprintf(buf, "%ld\n", IN_FROM_REG(data->in[nr], nr));
340 }
341
342 static ssize_t show_in_min(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_min[nr], nr));
345 }
346
347 static ssize_t show_in_max(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_max[nr], nr));
350 }
351
352 static ssize_t set_in_min(struct device *dev, const char *buf,
353 size_t count, int nr) {
354 struct i2c_client *client = to_i2c_client(dev);
355 struct via686a_data *data = i2c_get_clientdata(client);
356 unsigned long val = simple_strtoul(buf, NULL, 10);
357
358 down(&data->update_lock);
359 data->in_min[nr] = IN_TO_REG(val, nr);
360 via686a_write_value(client, VIA686A_REG_IN_MIN(nr),
361 data->in_min[nr]);
362 up(&data->update_lock);
363 return count;
364 }
365 static ssize_t set_in_max(struct device *dev, const char *buf,
366 size_t count, int nr) {
367 struct i2c_client *client = to_i2c_client(dev);
368 struct via686a_data *data = i2c_get_clientdata(client);
369 unsigned long val = simple_strtoul(buf, NULL, 10);
370
371 down(&data->update_lock);
372 data->in_max[nr] = IN_TO_REG(val, nr);
373 via686a_write_value(client, VIA686A_REG_IN_MAX(nr),
374 data->in_max[nr]);
375 up(&data->update_lock);
376 return count;
377 }
378 #define show_in_offset(offset) \
379 static ssize_t \
380 show_in##offset (struct device *dev, struct device_attribute *attr, char *buf) \
381 { \
382 return show_in(dev, buf, offset); \
383 } \
384 static ssize_t \
385 show_in##offset##_min (struct device *dev, struct device_attribute *attr, char *buf) \
386 { \
387 return show_in_min(dev, buf, offset); \
388 } \
389 static ssize_t \
390 show_in##offset##_max (struct device *dev, struct device_attribute *attr, char *buf) \
391 { \
392 return show_in_max(dev, buf, offset); \
393 } \
394 static ssize_t set_in##offset##_min (struct device *dev, struct device_attribute *attr, \
395 const char *buf, size_t count) \
396 { \
397 return set_in_min(dev, buf, count, offset); \
398 } \
399 static ssize_t set_in##offset##_max (struct device *dev, struct device_attribute *attr, \
400 const char *buf, size_t count) \
401 { \
402 return set_in_max(dev, buf, count, offset); \
403 } \
404 static DEVICE_ATTR(in##offset##_input, S_IRUGO, show_in##offset, NULL);\
405 static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
406 show_in##offset##_min, set_in##offset##_min); \
407 static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
408 show_in##offset##_max, set_in##offset##_max);
409
410 show_in_offset(0);
411 show_in_offset(1);
412 show_in_offset(2);
413 show_in_offset(3);
414 show_in_offset(4);
415
416 /* 3 temperatures */
417 static ssize_t show_temp(struct device *dev, char *buf, int nr) {
418 struct via686a_data *data = via686a_update_device(dev);
419 return sprintf(buf, "%ld\n", TEMP_FROM_REG10(data->temp[nr]));
420 }
421 static ssize_t show_temp_over(struct device *dev, char *buf, int nr) {
422 struct via686a_data *data = via686a_update_device(dev);
423 return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp_over[nr]));
424 }
425 static ssize_t show_temp_hyst(struct device *dev, char *buf, int nr) {
426 struct via686a_data *data = via686a_update_device(dev);
427 return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp_hyst[nr]));
428 }
429 static ssize_t set_temp_over(struct device *dev, const char *buf,
430 size_t count, int nr) {
431 struct i2c_client *client = to_i2c_client(dev);
432 struct via686a_data *data = i2c_get_clientdata(client);
433 int val = simple_strtol(buf, NULL, 10);
434
435 down(&data->update_lock);
436 data->temp_over[nr] = TEMP_TO_REG(val);
437 via686a_write_value(client, VIA686A_REG_TEMP_OVER[nr],
438 data->temp_over[nr]);
439 up(&data->update_lock);
440 return count;
441 }
442 static ssize_t set_temp_hyst(struct device *dev, const char *buf,
443 size_t count, int nr) {
444 struct i2c_client *client = to_i2c_client(dev);
445 struct via686a_data *data = i2c_get_clientdata(client);
446 int val = simple_strtol(buf, NULL, 10);
447
448 down(&data->update_lock);
449 data->temp_hyst[nr] = TEMP_TO_REG(val);
450 via686a_write_value(client, VIA686A_REG_TEMP_HYST[nr],
451 data->temp_hyst[nr]);
452 up(&data->update_lock);
453 return count;
454 }
455 #define show_temp_offset(offset) \
456 static ssize_t show_temp_##offset (struct device *dev, struct device_attribute *attr, char *buf) \
457 { \
458 return show_temp(dev, buf, offset - 1); \
459 } \
460 static ssize_t \
461 show_temp_##offset##_over (struct device *dev, struct device_attribute *attr, char *buf) \
462 { \
463 return show_temp_over(dev, buf, offset - 1); \
464 } \
465 static ssize_t \
466 show_temp_##offset##_hyst (struct device *dev, struct device_attribute *attr, char *buf) \
467 { \
468 return show_temp_hyst(dev, buf, offset - 1); \
469 } \
470 static ssize_t set_temp_##offset##_over (struct device *dev, struct device_attribute *attr, \
471 const char *buf, size_t count) \
472 { \
473 return set_temp_over(dev, buf, count, offset - 1); \
474 } \
475 static ssize_t set_temp_##offset##_hyst (struct device *dev, struct device_attribute *attr, \
476 const char *buf, size_t count) \
477 { \
478 return set_temp_hyst(dev, buf, count, offset - 1); \
479 } \
480 static DEVICE_ATTR(temp##offset##_input, S_IRUGO, show_temp_##offset, NULL);\
481 static DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
482 show_temp_##offset##_over, set_temp_##offset##_over); \
483 static DEVICE_ATTR(temp##offset##_max_hyst, S_IRUGO | S_IWUSR, \
484 show_temp_##offset##_hyst, set_temp_##offset##_hyst);
485
486 show_temp_offset(1);
487 show_temp_offset(2);
488 show_temp_offset(3);
489
490 /* 2 Fans */
491 static ssize_t show_fan(struct device *dev, char *buf, int nr) {
492 struct via686a_data *data = via686a_update_device(dev);
493 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
494 DIV_FROM_REG(data->fan_div[nr])) );
495 }
496 static ssize_t show_fan_min(struct device *dev, char *buf, int nr) {
497 struct via686a_data *data = via686a_update_device(dev);
498 return sprintf(buf, "%d\n",
499 FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr])) );
500 }
501 static ssize_t show_fan_div(struct device *dev, char *buf, int nr) {
502 struct via686a_data *data = via686a_update_device(dev);
503 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]) );
504 }
505 static ssize_t set_fan_min(struct device *dev, const char *buf,
506 size_t count, int nr) {
507 struct i2c_client *client = to_i2c_client(dev);
508 struct via686a_data *data = i2c_get_clientdata(client);
509 int val = simple_strtol(buf, NULL, 10);
510
511 down(&data->update_lock);
512 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
513 via686a_write_value(client, VIA686A_REG_FAN_MIN(nr+1), data->fan_min[nr]);
514 up(&data->update_lock);
515 return count;
516 }
517 static ssize_t set_fan_div(struct device *dev, const char *buf,
518 size_t count, int nr) {
519 struct i2c_client *client = to_i2c_client(dev);
520 struct via686a_data *data = i2c_get_clientdata(client);
521 int val = simple_strtol(buf, NULL, 10);
522 int old;
523
524 down(&data->update_lock);
525 old = via686a_read_value(client, VIA686A_REG_FANDIV);
526 data->fan_div[nr] = DIV_TO_REG(val);
527 old = (old & 0x0f) | (data->fan_div[1] << 6) | (data->fan_div[0] << 4);
528 via686a_write_value(client, VIA686A_REG_FANDIV, old);
529 up(&data->update_lock);
530 return count;
531 }
532
533 #define show_fan_offset(offset) \
534 static ssize_t show_fan_##offset (struct device *dev, struct device_attribute *attr, char *buf) \
535 { \
536 return show_fan(dev, buf, offset - 1); \
537 } \
538 static ssize_t show_fan_##offset##_min (struct device *dev, struct device_attribute *attr, char *buf) \
539 { \
540 return show_fan_min(dev, buf, offset - 1); \
541 } \
542 static ssize_t show_fan_##offset##_div (struct device *dev, struct device_attribute *attr, char *buf) \
543 { \
544 return show_fan_div(dev, buf, offset - 1); \
545 } \
546 static ssize_t set_fan_##offset##_min (struct device *dev, struct device_attribute *attr, \
547 const char *buf, size_t count) \
548 { \
549 return set_fan_min(dev, buf, count, offset - 1); \
550 } \
551 static ssize_t set_fan_##offset##_div (struct device *dev, struct device_attribute *attr, \
552 const char *buf, size_t count) \
553 { \
554 return set_fan_div(dev, buf, count, offset - 1); \
555 } \
556 static DEVICE_ATTR(fan##offset##_input, S_IRUGO, show_fan_##offset, NULL);\
557 static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
558 show_fan_##offset##_min, set_fan_##offset##_min); \
559 static DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
560 show_fan_##offset##_div, set_fan_##offset##_div);
561
562 show_fan_offset(1);
563 show_fan_offset(2);
564
565 /* Alarms */
566 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf) {
567 struct via686a_data *data = via686a_update_device(dev);
568 return sprintf(buf, "%u\n", data->alarms);
569 }
570 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
571
572 /* The driver. I choose to use type i2c_driver, as at is identical to both
573 smbus_driver and isa_driver, and clients could be of either kind */
574 static struct i2c_driver via686a_driver = {
575 .driver = {
576 .name = "via686a",
577 },
578 .attach_adapter = via686a_detect,
579 .detach_client = via686a_detach_client,
580 };
581
582
583 /* This is called when the module is loaded */
584 static int via686a_detect(struct i2c_adapter *adapter)
585 {
586 struct i2c_client *new_client;
587 struct via686a_data *data;
588 int err = 0;
589 const char client_name[] = "via686a";
590 u16 val;
591
592 /* 8231 requires multiple of 256, we enforce that on 686 as well */
593 if (force_addr) {
594 address = force_addr & 0xFF00;
595 dev_warn(&adapter->dev, "forcing ISA address 0x%04X\n",
596 address);
597 if (PCIBIOS_SUCCESSFUL !=
598 pci_write_config_word(s_bridge, VIA686A_BASE_REG, address))
599 return -ENODEV;
600 }
601 if (PCIBIOS_SUCCESSFUL !=
602 pci_read_config_word(s_bridge, VIA686A_ENABLE_REG, &val))
603 return -ENODEV;
604 if (!(val & 0x0001)) {
605 if (force_addr) {
606 dev_info(&adapter->dev, "enabling sensors\n");
607 if (PCIBIOS_SUCCESSFUL !=
608 pci_write_config_word(s_bridge, VIA686A_ENABLE_REG,
609 val | 0x0001))
610 return -ENODEV;
611 } else {
612 dev_warn(&adapter->dev, "sensors disabled - enable "
613 "with force_addr=0x%x\n", address);
614 return -ENODEV;
615 }
616 }
617
618 /* Reserve the ISA region */
619 if (!request_region(address, VIA686A_EXTENT,
620 via686a_driver.driver.name)) {
621 dev_err(&adapter->dev, "region 0x%x already in use!\n",
622 address);
623 return -ENODEV;
624 }
625
626 if (!(data = kzalloc(sizeof(struct via686a_data), GFP_KERNEL))) {
627 err = -ENOMEM;
628 goto exit_release;
629 }
630
631 new_client = &data->client;
632 i2c_set_clientdata(new_client, data);
633 new_client->addr = address;
634 new_client->adapter = adapter;
635 new_client->driver = &via686a_driver;
636 new_client->flags = 0;
637
638 /* Fill in the remaining client fields and put into the global list */
639 strlcpy(new_client->name, client_name, I2C_NAME_SIZE);
640
641 data->valid = 0;
642 init_MUTEX(&data->update_lock);
643 /* Tell the I2C layer a new client has arrived */
644 if ((err = i2c_attach_client(new_client)))
645 goto exit_free;
646
647 /* Initialize the VIA686A chip */
648 via686a_init_client(new_client);
649
650 /* Register sysfs hooks */
651 data->class_dev = hwmon_device_register(&new_client->dev);
652 if (IS_ERR(data->class_dev)) {
653 err = PTR_ERR(data->class_dev);
654 goto exit_detach;
655 }
656
657 device_create_file(&new_client->dev, &dev_attr_in0_input);
658 device_create_file(&new_client->dev, &dev_attr_in1_input);
659 device_create_file(&new_client->dev, &dev_attr_in2_input);
660 device_create_file(&new_client->dev, &dev_attr_in3_input);
661 device_create_file(&new_client->dev, &dev_attr_in4_input);
662 device_create_file(&new_client->dev, &dev_attr_in0_min);
663 device_create_file(&new_client->dev, &dev_attr_in1_min);
664 device_create_file(&new_client->dev, &dev_attr_in2_min);
665 device_create_file(&new_client->dev, &dev_attr_in3_min);
666 device_create_file(&new_client->dev, &dev_attr_in4_min);
667 device_create_file(&new_client->dev, &dev_attr_in0_max);
668 device_create_file(&new_client->dev, &dev_attr_in1_max);
669 device_create_file(&new_client->dev, &dev_attr_in2_max);
670 device_create_file(&new_client->dev, &dev_attr_in3_max);
671 device_create_file(&new_client->dev, &dev_attr_in4_max);
672 device_create_file(&new_client->dev, &dev_attr_temp1_input);
673 device_create_file(&new_client->dev, &dev_attr_temp2_input);
674 device_create_file(&new_client->dev, &dev_attr_temp3_input);
675 device_create_file(&new_client->dev, &dev_attr_temp1_max);
676 device_create_file(&new_client->dev, &dev_attr_temp2_max);
677 device_create_file(&new_client->dev, &dev_attr_temp3_max);
678 device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst);
679 device_create_file(&new_client->dev, &dev_attr_temp2_max_hyst);
680 device_create_file(&new_client->dev, &dev_attr_temp3_max_hyst);
681 device_create_file(&new_client->dev, &dev_attr_fan1_input);
682 device_create_file(&new_client->dev, &dev_attr_fan2_input);
683 device_create_file(&new_client->dev, &dev_attr_fan1_min);
684 device_create_file(&new_client->dev, &dev_attr_fan2_min);
685 device_create_file(&new_client->dev, &dev_attr_fan1_div);
686 device_create_file(&new_client->dev, &dev_attr_fan2_div);
687 device_create_file(&new_client->dev, &dev_attr_alarms);
688
689 return 0;
690
691 exit_detach:
692 i2c_detach_client(new_client);
693 exit_free:
694 kfree(data);
695 exit_release:
696 release_region(address, VIA686A_EXTENT);
697 return err;
698 }
699
700 static int via686a_detach_client(struct i2c_client *client)
701 {
702 struct via686a_data *data = i2c_get_clientdata(client);
703 int err;
704
705 hwmon_device_unregister(data->class_dev);
706
707 if ((err = i2c_detach_client(client)))
708 return err;
709
710 release_region(client->addr, VIA686A_EXTENT);
711 kfree(data);
712
713 return 0;
714 }
715
716 static void via686a_init_client(struct i2c_client *client)
717 {
718 u8 reg;
719
720 /* Start monitoring */
721 reg = via686a_read_value(client, VIA686A_REG_CONFIG);
722 via686a_write_value(client, VIA686A_REG_CONFIG, (reg|0x01)&0x7F);
723
724 /* Configure temp interrupt mode for continuous-interrupt operation */
725 via686a_write_value(client, VIA686A_REG_TEMP_MODE,
726 via686a_read_value(client, VIA686A_REG_TEMP_MODE) &
727 !(VIA686A_TEMP_MODE_MASK | VIA686A_TEMP_MODE_CONTINUOUS));
728 }
729
730 static struct via686a_data *via686a_update_device(struct device *dev)
731 {
732 struct i2c_client *client = to_i2c_client(dev);
733 struct via686a_data *data = i2c_get_clientdata(client);
734 int i;
735
736 down(&data->update_lock);
737
738 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
739 || !data->valid) {
740 for (i = 0; i <= 4; i++) {
741 data->in[i] =
742 via686a_read_value(client, VIA686A_REG_IN(i));
743 data->in_min[i] = via686a_read_value(client,
744 VIA686A_REG_IN_MIN
745 (i));
746 data->in_max[i] =
747 via686a_read_value(client, VIA686A_REG_IN_MAX(i));
748 }
749 for (i = 1; i <= 2; i++) {
750 data->fan[i - 1] =
751 via686a_read_value(client, VIA686A_REG_FAN(i));
752 data->fan_min[i - 1] = via686a_read_value(client,
753 VIA686A_REG_FAN_MIN(i));
754 }
755 for (i = 0; i <= 2; i++) {
756 data->temp[i] = via686a_read_value(client,
757 VIA686A_REG_TEMP[i]) << 2;
758 data->temp_over[i] =
759 via686a_read_value(client,
760 VIA686A_REG_TEMP_OVER[i]);
761 data->temp_hyst[i] =
762 via686a_read_value(client,
763 VIA686A_REG_TEMP_HYST[i]);
764 }
765 /* add in lower 2 bits
766 temp1 uses bits 7-6 of VIA686A_REG_TEMP_LOW1
767 temp2 uses bits 5-4 of VIA686A_REG_TEMP_LOW23
768 temp3 uses bits 7-6 of VIA686A_REG_TEMP_LOW23
769 */
770 data->temp[0] |= (via686a_read_value(client,
771 VIA686A_REG_TEMP_LOW1)
772 & 0xc0) >> 6;
773 data->temp[1] |=
774 (via686a_read_value(client, VIA686A_REG_TEMP_LOW23) &
775 0x30) >> 4;
776 data->temp[2] |=
777 (via686a_read_value(client, VIA686A_REG_TEMP_LOW23) &
778 0xc0) >> 6;
779
780 i = via686a_read_value(client, VIA686A_REG_FANDIV);
781 data->fan_div[0] = (i >> 4) & 0x03;
782 data->fan_div[1] = i >> 6;
783 data->alarms =
784 via686a_read_value(client,
785 VIA686A_REG_ALARM1) |
786 (via686a_read_value(client, VIA686A_REG_ALARM2) << 8);
787 data->last_updated = jiffies;
788 data->valid = 1;
789 }
790
791 up(&data->update_lock);
792
793 return data;
794 }
795
796 static struct pci_device_id via686a_pci_ids[] = {
797 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_4) },
798 { 0, }
799 };
800
801 MODULE_DEVICE_TABLE(pci, via686a_pci_ids);
802
803 static int __devinit via686a_pci_probe(struct pci_dev *dev,
804 const struct pci_device_id *id)
805 {
806 u16 val;
807
808 if (PCIBIOS_SUCCESSFUL !=
809 pci_read_config_word(dev, VIA686A_BASE_REG, &val))
810 return -ENODEV;
811
812 address = val & ~(VIA686A_EXTENT - 1);
813 if (address == 0 && force_addr == 0) {
814 dev_err(&dev->dev, "base address not set - upgrade BIOS "
815 "or use force_addr=0xaddr\n");
816 return -ENODEV;
817 }
818
819 s_bridge = pci_dev_get(dev);
820 if (i2c_isa_add_driver(&via686a_driver)) {
821 pci_dev_put(s_bridge);
822 s_bridge = NULL;
823 }
824
825 /* Always return failure here. This is to allow other drivers to bind
826 * to this pci device. We don't really want to have control over the
827 * pci device, we only wanted to read as few register values from it.
828 */
829 return -ENODEV;
830 }
831
832 static struct pci_driver via686a_pci_driver = {
833 .name = "via686a",
834 .id_table = via686a_pci_ids,
835 .probe = via686a_pci_probe,
836 };
837
838 static int __init sm_via686a_init(void)
839 {
840 return pci_register_driver(&via686a_pci_driver);
841 }
842
843 static void __exit sm_via686a_exit(void)
844 {
845 pci_unregister_driver(&via686a_pci_driver);
846 if (s_bridge != NULL) {
847 i2c_isa_del_driver(&via686a_driver);
848 pci_dev_put(s_bridge);
849 s_bridge = NULL;
850 }
851 }
852
853 MODULE_AUTHOR("Kyösti Mälkki <kmalkki@cc.hut.fi>, "
854 "Mark Studebaker <mdsxyz123@yahoo.com> "
855 "and Bob Dougherty <bobd@stanford.edu>");
856 MODULE_DESCRIPTION("VIA 686A Sensor device");
857 MODULE_LICENSE("GPL");
858
859 module_init(sm_via686a_init);
860 module_exit(sm_via686a_exit);
Linux with added FPC-III support