1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * via686a.c - Part of lm_sensors, Linux kernel modules
4 * for hardware monitoring
5 *
6 * Copyright (c) 1998 - 2002 Frodo Looijaard <frodol@dds.nl>,
7 * Kyösti Mälkki <kmalkki@cc.hut.fi>,
8 * Mark Studebaker <mdsxyz123@yahoo.com>,
9 * and Bob Dougherty <bobd@stanford.edu>
10 *
11 * (Some conversion-factor data were contributed by Jonathan Teh Soon Yew
12 * <j.teh@iname.com> and Alex van Kaam <darkside@chello.nl>.)
13 */
14
15 /*
16 * Supports the Via VT82C686A, VT82C686B south bridges.
17 * Reports all as a 686A.
18 * Warning - only supports a single device.
19 */
20
21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
23 #include <linux/module.h>
24 #include <linux/slab.h>
25 #include <linux/pci.h>
26 #include <linux/jiffies.h>
27 #include <linux/platform_device.h>
28 #include <linux/hwmon.h>
29 #include <linux/hwmon-sysfs.h>
30 #include <linux/err.h>
31 #include <linux/init.h>
32 #include <linux/mutex.h>
33 #include <linux/sysfs.h>
34 #include <linux/acpi.h>
35 #include <linux/io.h>
36
37 #define DRIVER_NAME "via686a"
38
39 /*
40 * If force_addr is set to anything different from 0, we forcibly enable
41 * the device at the given address.
42 */
43 static unsigned short force_addr;
44 module_param(force_addr, ushort, 0);
45 MODULE_PARM_DESC(force_addr,
46 "Initialize the base address of the sensors");
47
48 static struct platform_device *pdev;
49
50 /*
51 * The Via 686a southbridge has a LM78-like chip integrated on the same IC.
52 * This driver is a customized copy of lm78.c
53 */
54
55 /* Many VIA686A constants specified below */
56
57 /* Length of ISA address segment */
58 #define VIA686A_EXTENT 0x80
59 #define VIA686A_BASE_REG 0x70
60 #define VIA686A_ENABLE_REG 0x74
61
62 /* The VIA686A registers */
63 /* ins numbered 0-4 */
64 #define VIA686A_REG_IN_MAX(nr) (0x2b + ((nr) * 2))
65 #define VIA686A_REG_IN_MIN(nr) (0x2c + ((nr) * 2))
66 #define VIA686A_REG_IN(nr) (0x22 + (nr))
67
68 /* fans numbered 1-2 */
69 #define VIA686A_REG_FAN_MIN(nr) (0x3a + (nr))
70 #define VIA686A_REG_FAN(nr) (0x28 + (nr))
71
72 /* temps numbered 1-3 */
73 static const u8 VIA686A_REG_TEMP[] = { 0x20, 0x21, 0x1f };
74 static const u8 VIA686A_REG_TEMP_OVER[] = { 0x39, 0x3d, 0x1d };
75 static const u8 VIA686A_REG_TEMP_HYST[] = { 0x3a, 0x3e, 0x1e };
76 /* bits 7-6 */
77 #define VIA686A_REG_TEMP_LOW1 0x4b
78 /* 2 = bits 5-4, 3 = bits 7-6 */
79 #define VIA686A_REG_TEMP_LOW23 0x49
80
81 #define VIA686A_REG_ALARM1 0x41
82 #define VIA686A_REG_ALARM2 0x42
83 #define VIA686A_REG_FANDIV 0x47
84 #define VIA686A_REG_CONFIG 0x40
85 /*
86 * The following register sets temp interrupt mode (bits 1-0 for temp1,
87 * 3-2 for temp2, 5-4 for temp3). Modes are:
88 * 00 interrupt stays as long as value is out-of-range
89 * 01 interrupt is cleared once register is read (default)
90 * 10 comparator mode- like 00, but ignores hysteresis
91 * 11 same as 00
92 */
93 #define VIA686A_REG_TEMP_MODE 0x4b
94 /* We'll just assume that you want to set all 3 simultaneously: */
95 #define VIA686A_TEMP_MODE_MASK 0x3F
96 #define VIA686A_TEMP_MODE_CONTINUOUS 0x00
97
98 /*
99 * Conversions. Limit checking is only done on the TO_REG
100 * variants.
101 *
102 ******** VOLTAGE CONVERSIONS (Bob Dougherty) ********
103 * From HWMon.cpp (Copyright 1998-2000 Jonathan Teh Soon Yew):
104 * voltagefactor[0]=1.25/2628; (2628/1.25=2102.4) // Vccp
105 * voltagefactor[1]=1.25/2628; (2628/1.25=2102.4) // +2.5V
106 * voltagefactor[2]=1.67/2628; (2628/1.67=1573.7) // +3.3V
107 * voltagefactor[3]=2.6/2628; (2628/2.60=1010.8) // +5V
108 * voltagefactor[4]=6.3/2628; (2628/6.30=417.14) // +12V
109 * in[i]=(data[i+2]*25.0+133)*voltagefactor[i];
110 * That is:
111 * volts = (25*regVal+133)*factor
112 * regVal = (volts/factor-133)/25
113 * (These conversions were contributed by Jonathan Teh Soon Yew
114 * <j.teh@iname.com>)
115 */
IN_TO_REG(long val,int in_num)116 static inline u8 IN_TO_REG(long val, int in_num)
117 {
118 /*
119 * To avoid floating point, we multiply constants by 10 (100 for +12V).
120 * Rounding is done (120500 is actually 133000 - 12500).
121 * Remember that val is expressed in 0.001V/bit, which is why we divide
122 * by an additional 10000 (100000 for +12V): 1000 for val and 10 (100)
123 * for the constants.
124 */
125 if (in_num <= 1)
126 return (u8) clamp_val((val * 21024 - 1205000) / 250000, 0, 255);
127 else if (in_num == 2)
128 return (u8) clamp_val((val * 15737 - 1205000) / 250000, 0, 255);
129 else if (in_num == 3)
130 return (u8) clamp_val((val * 10108 - 1205000) / 250000, 0, 255);
131 else
132 return (u8) clamp_val((val * 41714 - 12050000) / 2500000, 0,
133 255);
134 }
135
IN_FROM_REG(u8 val,int in_num)136 static inline long IN_FROM_REG(u8 val, int in_num)
137 {
138 /*
139 * To avoid floating point, we multiply constants by 10 (100 for +12V).
140 * We also multiply them by 1000 because we want 0.001V/bit for the
141 * output value. Rounding is done.
142 */
143 if (in_num <= 1)
144 return (long) ((250000 * val + 1330000 + 21024 / 2) / 21024);
145 else if (in_num == 2)
146 return (long) ((250000 * val + 1330000 + 15737 / 2) / 15737);
147 else if (in_num == 3)
148 return (long) ((250000 * val + 1330000 + 10108 / 2) / 10108);
149 else
150 return (long) ((2500000 * val + 13300000 + 41714 / 2) / 41714);
151 }
152
153 /********* FAN RPM CONVERSIONS ********/
154 /*
155 * Higher register values = slower fans (the fan's strobe gates a counter).
156 * But this chip saturates back at 0, not at 255 like all the other chips.
157 * So, 0 means 0 RPM
158 */
FAN_TO_REG(long rpm,int div)159 static inline u8 FAN_TO_REG(long rpm, int div)
160 {
161 if (rpm == 0)
162 return 0;
163 rpm = clamp_val(rpm, 1, 1000000);
164 return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 255);
165 }
166
167 #define FAN_FROM_REG(val, div) ((val) == 0 ? 0 : (val) == 255 ? 0 : 1350000 / \
168 ((val) * (div)))
169
170 /******** TEMP CONVERSIONS (Bob Dougherty) *********/
171 /*
172 * linear fits from HWMon.cpp (Copyright 1998-2000 Jonathan Teh Soon Yew)
173 * if(temp<169)
174 * return double(temp)*0.427-32.08;
175 * else if(temp>=169 && temp<=202)
176 * return double(temp)*0.582-58.16;
177 * else
178 * return double(temp)*0.924-127.33;
179 *
180 * A fifth-order polynomial fits the unofficial data (provided by Alex van
181 * Kaam <darkside@chello.nl>) a bit better. It also give more reasonable
182 * numbers on my machine (ie. they agree with what my BIOS tells me).
183 * Here's the fifth-order fit to the 8-bit data:
184 * temp = 1.625093e-10*val^5 - 1.001632e-07*val^4 + 2.457653e-05*val^3 -
185 * 2.967619e-03*val^2 + 2.175144e-01*val - 7.090067e+0.
186 *
187 * (2000-10-25- RFD: thanks to Uwe Andersen <uandersen@mayah.com> for
188 * finding my typos in this formula!)
189 *
190 * Alas, none of the elegant function-fit solutions will work because we
191 * aren't allowed to use floating point in the kernel and doing it with
192 * integers doesn't provide enough precision. So we'll do boring old
193 * look-up table stuff. The unofficial data (see below) have effectively
194 * 7-bit resolution (they are rounded to the nearest degree). I'm assuming
195 * that the transfer function of the device is monotonic and smooth, so a
196 * smooth function fit to the data will allow us to get better precision.
197 * I used the 5th-order poly fit described above and solved for
198 * VIA register values 0-255. I *10 before rounding, so we get tenth-degree
199 * precision. (I could have done all 1024 values for our 10-bit readings,
200 * but the function is very linear in the useful range (0-80 deg C), so
201 * we'll just use linear interpolation for 10-bit readings.) So, temp_lut
202 * is the temp at via register values 0-255:
203 */
204 static const s16 temp_lut[] = {
205 -709, -688, -667, -646, -627, -607, -589, -570, -553, -536, -519,
206 -503, -487, -471, -456, -442, -428, -414, -400, -387, -375,
207 -362, -350, -339, -327, -316, -305, -295, -285, -275, -265,
208 -255, -246, -237, -229, -220, -212, -204, -196, -188, -180,
209 -173, -166, -159, -152, -145, -139, -132, -126, -120, -114,
210 -108, -102, -96, -91, -85, -80, -74, -69, -64, -59, -54, -49,
211 -44, -39, -34, -29, -25, -20, -15, -11, -6, -2, 3, 7, 12, 16,
212 20, 25, 29, 33, 37, 42, 46, 50, 54, 59, 63, 67, 71, 75, 79, 84,
213 88, 92, 96, 100, 104, 109, 113, 117, 121, 125, 130, 134, 138,
214 142, 146, 151, 155, 159, 163, 168, 172, 176, 181, 185, 189,
215 193, 198, 202, 206, 211, 215, 219, 224, 228, 232, 237, 241,
216 245, 250, 254, 259, 263, 267, 272, 276, 281, 285, 290, 294,
217 299, 303, 307, 312, 316, 321, 325, 330, 334, 339, 344, 348,
218 353, 357, 362, 366, 371, 376, 380, 385, 390, 395, 399, 404,
219 409, 414, 419, 423, 428, 433, 438, 443, 449, 454, 459, 464,
220 469, 475, 480, 486, 491, 497, 502, 508, 514, 520, 526, 532,
221 538, 544, 551, 557, 564, 571, 578, 584, 592, 599, 606, 614,
222 621, 629, 637, 645, 654, 662, 671, 680, 689, 698, 708, 718,
223 728, 738, 749, 759, 770, 782, 793, 805, 818, 830, 843, 856,
224 870, 883, 898, 912, 927, 943, 958, 975, 991, 1008, 1026, 1044,
225 1062, 1081, 1101, 1121, 1141, 1162, 1184, 1206, 1229, 1252,
226 1276, 1301, 1326, 1352, 1378, 1406, 1434, 1462
227 };
228
229 /*
230 * the original LUT values from Alex van Kaam <darkside@chello.nl>
231 * (for via register values 12-240):
232 * {-50,-49,-47,-45,-43,-41,-39,-38,-37,-35,-34,-33,-32,-31,
233 * -30,-29,-28,-27,-26,-25,-24,-24,-23,-22,-21,-20,-20,-19,-18,-17,-17,-16,-15,
234 * -15,-14,-14,-13,-12,-12,-11,-11,-10,-9,-9,-8,-8,-7,-7,-6,-6,-5,-5,-4,-4,-3,
235 * -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,
236 * 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,
237 * 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,
238 * 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,
239 * 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,
240 * 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,
241 * 85,86,88,89,91,92,94,96,97,99,101,103,105,107,109,110};
242 *
243 *
244 * Here's the reverse LUT. I got it by doing a 6-th order poly fit (needed
245 * an extra term for a good fit to these inverse data!) and then
246 * solving for each temp value from -50 to 110 (the useable range for
247 * this chip). Here's the fit:
248 * viaRegVal = -1.160370e-10*val^6 +3.193693e-08*val^5 - 1.464447e-06*val^4
249 * - 2.525453e-04*val^3 + 1.424593e-02*val^2 + 2.148941e+00*val +7.275808e+01)
250 * Note that n=161:
251 */
252 static const u8 via_lut[] = {
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,
265 239, 240
266 };
267
268 /*
269 * Converting temps to (8-bit) hyst and over registers
270 * No interpolation here.
271 * The +50 is because the temps start at -50
272 */
TEMP_TO_REG(long val)273 static inline u8 TEMP_TO_REG(long val)
274 {
275 return via_lut[val <= -50000 ? 0 : val >= 110000 ? 160 :
276 (val < 0 ? val - 500 : val + 500) / 1000 + 50];
277 }
278
279 /* for 8-bit temperature hyst and over registers */
280 #define TEMP_FROM_REG(val) ((long)temp_lut[val] * 100)
281
282 /* for 10-bit temperature readings */
TEMP_FROM_REG10(u16 val)283 static inline long TEMP_FROM_REG10(u16 val)
284 {
285 u16 eight_bits = val >> 2;
286 u16 two_bits = val & 3;
287
288 /* no interpolation for these */
289 if (two_bits == 0 || eight_bits == 255)
290 return TEMP_FROM_REG(eight_bits);
291
292 /* do some linear interpolation */
293 return (temp_lut[eight_bits] * (4 - two_bits) +
294 temp_lut[eight_bits + 1] * two_bits) * 25;
295 }
296
297 #define DIV_FROM_REG(val) (1 << (val))
298 #define DIV_TO_REG(val) ((val) == 8 ? 3 : (val) == 4 ? 2 : (val) == 1 ? 0 : 1)
299
300 /*
301 * For each registered chip, we need to keep some data in memory.
302 * The structure is dynamically allocated.
303 */
304 struct via686a_data {
305 unsigned short addr;
306 const char *name;
307 struct device *hwmon_dev;
308 struct mutex update_lock;
309 bool valid; /* true if following fields are valid */
310 unsigned long last_updated; /* In jiffies */
311
312 u8 in[5]; /* Register value */
313 u8 in_max[5]; /* Register value */
314 u8 in_min[5]; /* Register value */
315 u8 fan[2]; /* Register value */
316 u8 fan_min[2]; /* Register value */
317 u16 temp[3]; /* Register value 10 bit */
318 u8 temp_over[3]; /* Register value */
319 u8 temp_hyst[3]; /* Register value */
320 u8 fan_div[2]; /* Register encoding, shifted right */
321 u16 alarms; /* Register encoding, combined */
322 };
323
324 static struct pci_dev *s_bridge; /* pointer to the (only) via686a */
325
via686a_read_value(struct via686a_data * data,u8 reg)326 static inline int via686a_read_value(struct via686a_data *data, u8 reg)
327 {
328 return inb_p(data->addr + reg);
329 }
330
via686a_write_value(struct via686a_data * data,u8 reg,u8 value)331 static inline void via686a_write_value(struct via686a_data *data, u8 reg,
332 u8 value)
333 {
334 outb_p(value, data->addr + reg);
335 }
336
via686a_update_fan_div(struct via686a_data * data)337 static void via686a_update_fan_div(struct via686a_data *data)
338 {
339 int reg = via686a_read_value(data, VIA686A_REG_FANDIV);
340 data->fan_div[0] = (reg >> 4) & 0x03;
341 data->fan_div[1] = reg >> 6;
342 }
343
via686a_update_device(struct device * dev)344 static struct via686a_data *via686a_update_device(struct device *dev)
345 {
346 struct via686a_data *data = dev_get_drvdata(dev);
347 int i;
348
349 mutex_lock(&data->update_lock);
350
351 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
352 || !data->valid) {
353 for (i = 0; i <= 4; i++) {
354 data->in[i] =
355 via686a_read_value(data, VIA686A_REG_IN(i));
356 data->in_min[i] = via686a_read_value(data,
357 VIA686A_REG_IN_MIN
358 (i));
359 data->in_max[i] =
360 via686a_read_value(data, VIA686A_REG_IN_MAX(i));
361 }
362 for (i = 1; i <= 2; i++) {
363 data->fan[i - 1] =
364 via686a_read_value(data, VIA686A_REG_FAN(i));
365 data->fan_min[i - 1] = via686a_read_value(data,
366 VIA686A_REG_FAN_MIN(i));
367 }
368 for (i = 0; i <= 2; i++) {
369 data->temp[i] = via686a_read_value(data,
370 VIA686A_REG_TEMP[i]) << 2;
371 data->temp_over[i] =
372 via686a_read_value(data,
373 VIA686A_REG_TEMP_OVER[i]);
374 data->temp_hyst[i] =
375 via686a_read_value(data,
376 VIA686A_REG_TEMP_HYST[i]);
377 }
378 /*
379 * add in lower 2 bits
380 * temp1 uses bits 7-6 of VIA686A_REG_TEMP_LOW1
381 * temp2 uses bits 5-4 of VIA686A_REG_TEMP_LOW23
382 * temp3 uses bits 7-6 of VIA686A_REG_TEMP_LOW23
383 */
384 data->temp[0] |= (via686a_read_value(data,
385 VIA686A_REG_TEMP_LOW1)
386 & 0xc0) >> 6;
387 data->temp[1] |=
388 (via686a_read_value(data, VIA686A_REG_TEMP_LOW23) &
389 0x30) >> 4;
390 data->temp[2] |=
391 (via686a_read_value(data, VIA686A_REG_TEMP_LOW23) &
392 0xc0) >> 6;
393
394 via686a_update_fan_div(data);
395 data->alarms =
396 via686a_read_value(data,
397 VIA686A_REG_ALARM1) |
398 (via686a_read_value(data, VIA686A_REG_ALARM2) << 8);
399 data->last_updated = jiffies;
400 data->valid = true;
401 }
402
403 mutex_unlock(&data->update_lock);
404
405 return data;
406 }
407
408 /* following are the sysfs callback functions */
409
410 /* 7 voltage sensors */
in_show(struct device * dev,struct device_attribute * da,char * buf)411 static ssize_t in_show(struct device *dev, struct device_attribute *da,
412 char *buf) {
413 struct via686a_data *data = via686a_update_device(dev);
414 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
415 int nr = attr->index;
416 return sprintf(buf, "%ld\n", IN_FROM_REG(data->in[nr], nr));
417 }
418
in_min_show(struct device * dev,struct device_attribute * da,char * buf)419 static ssize_t in_min_show(struct device *dev, struct device_attribute *da,
420 char *buf) {
421 struct via686a_data *data = via686a_update_device(dev);
422 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
423 int nr = attr->index;
424 return sprintf(buf, "%ld\n", IN_FROM_REG(data->in_min[nr], nr));
425 }
426
in_max_show(struct device * dev,struct device_attribute * da,char * buf)427 static ssize_t in_max_show(struct device *dev, struct device_attribute *da,
428 char *buf) {
429 struct via686a_data *data = via686a_update_device(dev);
430 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
431 int nr = attr->index;
432 return sprintf(buf, "%ld\n", IN_FROM_REG(data->in_max[nr], nr));
433 }
434
in_min_store(struct device * dev,struct device_attribute * da,const char * buf,size_t count)435 static ssize_t in_min_store(struct device *dev, struct device_attribute *da,
436 const char *buf, size_t count) {
437 struct via686a_data *data = dev_get_drvdata(dev);
438 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
439 int nr = attr->index;
440 unsigned long val;
441 int err;
442
443 err = kstrtoul(buf, 10, &val);
444 if (err)
445 return err;
446
447 mutex_lock(&data->update_lock);
448 data->in_min[nr] = IN_TO_REG(val, nr);
449 via686a_write_value(data, VIA686A_REG_IN_MIN(nr),
450 data->in_min[nr]);
451 mutex_unlock(&data->update_lock);
452 return count;
453 }
in_max_store(struct device * dev,struct device_attribute * da,const char * buf,size_t count)454 static ssize_t in_max_store(struct device *dev, struct device_attribute *da,
455 const char *buf, size_t count) {
456 struct via686a_data *data = dev_get_drvdata(dev);
457 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
458 int nr = attr->index;
459 unsigned long val;
460 int err;
461
462 err = kstrtoul(buf, 10, &val);
463 if (err)
464 return err;
465
466 mutex_lock(&data->update_lock);
467 data->in_max[nr] = IN_TO_REG(val, nr);
468 via686a_write_value(data, VIA686A_REG_IN_MAX(nr),
469 data->in_max[nr]);
470 mutex_unlock(&data->update_lock);
471 return count;
472 }
473
474 static SENSOR_DEVICE_ATTR_RO(in0_input, in, 0);
475 static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0);
476 static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0);
477 static SENSOR_DEVICE_ATTR_RO(in1_input, in, 1);
478 static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1);
479 static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1);
480 static SENSOR_DEVICE_ATTR_RO(in2_input, in, 2);
481 static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2);
482 static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2);
483 static SENSOR_DEVICE_ATTR_RO(in3_input, in, 3);
484 static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3);
485 static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3);
486 static SENSOR_DEVICE_ATTR_RO(in4_input, in, 4);
487 static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4);
488 static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4);
489
490 /* 3 temperatures */
temp_show(struct device * dev,struct device_attribute * da,char * buf)491 static ssize_t temp_show(struct device *dev, struct device_attribute *da,
492 char *buf) {
493 struct via686a_data *data = via686a_update_device(dev);
494 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
495 int nr = attr->index;
496 return sprintf(buf, "%ld\n", TEMP_FROM_REG10(data->temp[nr]));
497 }
temp_over_show(struct device * dev,struct device_attribute * da,char * buf)498 static ssize_t temp_over_show(struct device *dev, struct device_attribute *da,
499 char *buf) {
500 struct via686a_data *data = via686a_update_device(dev);
501 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
502 int nr = attr->index;
503 return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp_over[nr]));
504 }
temp_hyst_show(struct device * dev,struct device_attribute * da,char * buf)505 static ssize_t temp_hyst_show(struct device *dev, struct device_attribute *da,
506 char *buf) {
507 struct via686a_data *data = via686a_update_device(dev);
508 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
509 int nr = attr->index;
510 return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp_hyst[nr]));
511 }
temp_over_store(struct device * dev,struct device_attribute * da,const char * buf,size_t count)512 static ssize_t temp_over_store(struct device *dev,
513 struct device_attribute *da, const char *buf,
514 size_t count) {
515 struct via686a_data *data = dev_get_drvdata(dev);
516 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
517 int nr = attr->index;
518 long val;
519 int err;
520
521 err = kstrtol(buf, 10, &val);
522 if (err)
523 return err;
524
525 mutex_lock(&data->update_lock);
526 data->temp_over[nr] = TEMP_TO_REG(val);
527 via686a_write_value(data, VIA686A_REG_TEMP_OVER[nr],
528 data->temp_over[nr]);
529 mutex_unlock(&data->update_lock);
530 return count;
531 }
temp_hyst_store(struct device * dev,struct device_attribute * da,const char * buf,size_t count)532 static ssize_t temp_hyst_store(struct device *dev,
533 struct device_attribute *da, const char *buf,
534 size_t count) {
535 struct via686a_data *data = dev_get_drvdata(dev);
536 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
537 int nr = attr->index;
538 long val;
539 int err;
540
541 err = kstrtol(buf, 10, &val);
542 if (err)
543 return err;
544
545 mutex_lock(&data->update_lock);
546 data->temp_hyst[nr] = TEMP_TO_REG(val);
547 via686a_write_value(data, VIA686A_REG_TEMP_HYST[nr],
548 data->temp_hyst[nr]);
549 mutex_unlock(&data->update_lock);
550 return count;
551 }
552
553 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
554 static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_over, 0);
555 static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, temp_hyst, 0);
556 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
557 static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_over, 1);
558 static SENSOR_DEVICE_ATTR_RW(temp2_max_hyst, temp_hyst, 1);
559 static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
560 static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_over, 2);
561 static SENSOR_DEVICE_ATTR_RW(temp3_max_hyst, temp_hyst, 2);
562
563 /* 2 Fans */
fan_show(struct device * dev,struct device_attribute * da,char * buf)564 static ssize_t fan_show(struct device *dev, struct device_attribute *da,
565 char *buf) {
566 struct via686a_data *data = via686a_update_device(dev);
567 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
568 int nr = attr->index;
569 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
570 DIV_FROM_REG(data->fan_div[nr])));
571 }
fan_min_show(struct device * dev,struct device_attribute * da,char * buf)572 static ssize_t fan_min_show(struct device *dev, struct device_attribute *da,
573 char *buf) {
574 struct via686a_data *data = via686a_update_device(dev);
575 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
576 int nr = attr->index;
577 return sprintf(buf, "%d\n",
578 FAN_FROM_REG(data->fan_min[nr],
579 DIV_FROM_REG(data->fan_div[nr])));
580 }
fan_div_show(struct device * dev,struct device_attribute * da,char * buf)581 static ssize_t fan_div_show(struct device *dev, struct device_attribute *da,
582 char *buf) {
583 struct via686a_data *data = via686a_update_device(dev);
584 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
585 int nr = attr->index;
586 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
587 }
fan_min_store(struct device * dev,struct device_attribute * da,const char * buf,size_t count)588 static ssize_t fan_min_store(struct device *dev, struct device_attribute *da,
589 const char *buf, size_t count) {
590 struct via686a_data *data = dev_get_drvdata(dev);
591 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
592 int nr = attr->index;
593 unsigned long val;
594 int err;
595
596 err = kstrtoul(buf, 10, &val);
597 if (err)
598 return err;
599
600 mutex_lock(&data->update_lock);
601 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
602 via686a_write_value(data, VIA686A_REG_FAN_MIN(nr+1), data->fan_min[nr]);
603 mutex_unlock(&data->update_lock);
604 return count;
605 }
fan_div_store(struct device * dev,struct device_attribute * da,const char * buf,size_t count)606 static ssize_t fan_div_store(struct device *dev, struct device_attribute *da,
607 const char *buf, size_t count) {
608 struct via686a_data *data = dev_get_drvdata(dev);
609 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
610 int nr = attr->index;
611 int old;
612 unsigned long val;
613 int err;
614
615 err = kstrtoul(buf, 10, &val);
616 if (err)
617 return err;
618
619 mutex_lock(&data->update_lock);
620 old = via686a_read_value(data, VIA686A_REG_FANDIV);
621 data->fan_div[nr] = DIV_TO_REG(val);
622 old = (old & 0x0f) | (data->fan_div[1] << 6) | (data->fan_div[0] << 4);
623 via686a_write_value(data, VIA686A_REG_FANDIV, old);
624 mutex_unlock(&data->update_lock);
625 return count;
626 }
627
628 static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);
629 static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);
630 static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
631 static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);
632 static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
633 static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);
634
635 /* Alarms */
alarms_show(struct device * dev,struct device_attribute * attr,char * buf)636 static ssize_t alarms_show(struct device *dev, struct device_attribute *attr,
637 char *buf)
638 {
639 struct via686a_data *data = via686a_update_device(dev);
640 return sprintf(buf, "%u\n", data->alarms);
641 }
642
643 static DEVICE_ATTR_RO(alarms);
644
alarm_show(struct device * dev,struct device_attribute * attr,char * buf)645 static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
646 char *buf)
647 {
648 int bitnr = to_sensor_dev_attr(attr)->index;
649 struct via686a_data *data = via686a_update_device(dev);
650 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
651 }
652 static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0);
653 static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1);
654 static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2);
655 static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3);
656 static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8);
657 static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4);
658 static SENSOR_DEVICE_ATTR_RO(temp2_alarm, alarm, 11);
659 static SENSOR_DEVICE_ATTR_RO(temp3_alarm, alarm, 15);
660 static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6);
661 static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7);
662
name_show(struct device * dev,struct device_attribute * devattr,char * buf)663 static ssize_t name_show(struct device *dev, struct device_attribute
664 *devattr, char *buf)
665 {
666 struct via686a_data *data = dev_get_drvdata(dev);
667 return sprintf(buf, "%s\n", data->name);
668 }
669 static DEVICE_ATTR_RO(name);
670
671 static struct attribute *via686a_attributes[] = {
672 &sensor_dev_attr_in0_input.dev_attr.attr,
673 &sensor_dev_attr_in1_input.dev_attr.attr,
674 &sensor_dev_attr_in2_input.dev_attr.attr,
675 &sensor_dev_attr_in3_input.dev_attr.attr,
676 &sensor_dev_attr_in4_input.dev_attr.attr,
677 &sensor_dev_attr_in0_min.dev_attr.attr,
678 &sensor_dev_attr_in1_min.dev_attr.attr,
679 &sensor_dev_attr_in2_min.dev_attr.attr,
680 &sensor_dev_attr_in3_min.dev_attr.attr,
681 &sensor_dev_attr_in4_min.dev_attr.attr,
682 &sensor_dev_attr_in0_max.dev_attr.attr,
683 &sensor_dev_attr_in1_max.dev_attr.attr,
684 &sensor_dev_attr_in2_max.dev_attr.attr,
685 &sensor_dev_attr_in3_max.dev_attr.attr,
686 &sensor_dev_attr_in4_max.dev_attr.attr,
687 &sensor_dev_attr_in0_alarm.dev_attr.attr,
688 &sensor_dev_attr_in1_alarm.dev_attr.attr,
689 &sensor_dev_attr_in2_alarm.dev_attr.attr,
690 &sensor_dev_attr_in3_alarm.dev_attr.attr,
691 &sensor_dev_attr_in4_alarm.dev_attr.attr,
692
693 &sensor_dev_attr_temp1_input.dev_attr.attr,
694 &sensor_dev_attr_temp2_input.dev_attr.attr,
695 &sensor_dev_attr_temp3_input.dev_attr.attr,
696 &sensor_dev_attr_temp1_max.dev_attr.attr,
697 &sensor_dev_attr_temp2_max.dev_attr.attr,
698 &sensor_dev_attr_temp3_max.dev_attr.attr,
699 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
700 &sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
701 &sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
702 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
703 &sensor_dev_attr_temp2_alarm.dev_attr.attr,
704 &sensor_dev_attr_temp3_alarm.dev_attr.attr,
705
706 &sensor_dev_attr_fan1_input.dev_attr.attr,
707 &sensor_dev_attr_fan2_input.dev_attr.attr,
708 &sensor_dev_attr_fan1_min.dev_attr.attr,
709 &sensor_dev_attr_fan2_min.dev_attr.attr,
710 &sensor_dev_attr_fan1_div.dev_attr.attr,
711 &sensor_dev_attr_fan2_div.dev_attr.attr,
712 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
713 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
714
715 &dev_attr_alarms.attr,
716 &dev_attr_name.attr,
717 NULL
718 };
719
720 static const struct attribute_group via686a_group = {
721 .attrs = via686a_attributes,
722 };
723
via686a_init_device(struct via686a_data * data)724 static void via686a_init_device(struct via686a_data *data)
725 {
726 u8 reg;
727
728 /* Start monitoring */
729 reg = via686a_read_value(data, VIA686A_REG_CONFIG);
730 via686a_write_value(data, VIA686A_REG_CONFIG, (reg | 0x01) & 0x7F);
731
732 /* Configure temp interrupt mode for continuous-interrupt operation */
733 reg = via686a_read_value(data, VIA686A_REG_TEMP_MODE);
734 via686a_write_value(data, VIA686A_REG_TEMP_MODE,
735 (reg & ~VIA686A_TEMP_MODE_MASK)
736 | VIA686A_TEMP_MODE_CONTINUOUS);
737
738 /* Pre-read fan clock divisor values */
739 via686a_update_fan_div(data);
740 }
741
742 /* This is called when the module is loaded */
via686a_probe(struct platform_device * pdev)743 static int via686a_probe(struct platform_device *pdev)
744 {
745 struct via686a_data *data;
746 struct resource *res;
747 int err;
748
749 /* Reserve the ISA region */
750 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
751 if (!devm_request_region(&pdev->dev, res->start, VIA686A_EXTENT,
752 DRIVER_NAME)) {
753 dev_err(&pdev->dev, "Region 0x%lx-0x%lx already in use!\n",
754 (unsigned long)res->start, (unsigned long)res->end);
755 return -ENODEV;
756 }
757
758 data = devm_kzalloc(&pdev->dev, sizeof(struct via686a_data),
759 GFP_KERNEL);
760 if (!data)
761 return -ENOMEM;
762
763 platform_set_drvdata(pdev, data);
764 data->addr = res->start;
765 data->name = DRIVER_NAME;
766 mutex_init(&data->update_lock);
767
768 /* Initialize the VIA686A chip */
769 via686a_init_device(data);
770
771 /* Register sysfs hooks */
772 err = sysfs_create_group(&pdev->dev.kobj, &via686a_group);
773 if (err)
774 return err;
775
776 data->hwmon_dev = hwmon_device_register(&pdev->dev);
777 if (IS_ERR(data->hwmon_dev)) {
778 err = PTR_ERR(data->hwmon_dev);
779 goto exit_remove_files;
780 }
781
782 return 0;
783
784 exit_remove_files:
785 sysfs_remove_group(&pdev->dev.kobj, &via686a_group);
786 return err;
787 }
788
via686a_remove(struct platform_device * pdev)789 static int via686a_remove(struct platform_device *pdev)
790 {
791 struct via686a_data *data = platform_get_drvdata(pdev);
792
793 hwmon_device_unregister(data->hwmon_dev);
794 sysfs_remove_group(&pdev->dev.kobj, &via686a_group);
795
796 return 0;
797 }
798
799 static struct platform_driver via686a_driver = {
800 .driver = {
801 .name = DRIVER_NAME,
802 },
803 .probe = via686a_probe,
804 .remove = via686a_remove,
805 };
806
807 static const struct pci_device_id via686a_pci_ids[] = {
808 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_4) },
809 { }
810 };
811 MODULE_DEVICE_TABLE(pci, via686a_pci_ids);
812
via686a_device_add(unsigned short address)813 static int via686a_device_add(unsigned short address)
814 {
815 struct resource res = {
816 .start = address,
817 .end = address + VIA686A_EXTENT - 1,
818 .name = DRIVER_NAME,
819 .flags = IORESOURCE_IO,
820 };
821 int err;
822
823 err = acpi_check_resource_conflict(&res);
824 if (err)
825 goto exit;
826
827 pdev = platform_device_alloc(DRIVER_NAME, address);
828 if (!pdev) {
829 err = -ENOMEM;
830 pr_err("Device allocation failed\n");
831 goto exit;
832 }
833
834 err = platform_device_add_resources(pdev, &res, 1);
835 if (err) {
836 pr_err("Device resource addition failed (%d)\n", err);
837 goto exit_device_put;
838 }
839
840 err = platform_device_add(pdev);
841 if (err) {
842 pr_err("Device addition failed (%d)\n", err);
843 goto exit_device_put;
844 }
845
846 return 0;
847
848 exit_device_put:
849 platform_device_put(pdev);
850 exit:
851 return err;
852 }
853
via686a_pci_probe(struct pci_dev * dev,const struct pci_device_id * id)854 static int via686a_pci_probe(struct pci_dev *dev,
855 const struct pci_device_id *id)
856 {
857 u16 address, val;
858 int ret;
859
860 if (force_addr) {
861 address = force_addr & ~(VIA686A_EXTENT - 1);
862 dev_warn(&dev->dev, "Forcing ISA address 0x%x\n", address);
863 ret = pci_write_config_word(dev, VIA686A_BASE_REG, address | 1);
864 if (ret != PCIBIOS_SUCCESSFUL)
865 return -ENODEV;
866 }
867 ret = pci_read_config_word(dev, VIA686A_BASE_REG, &val);
868 if (ret != PCIBIOS_SUCCESSFUL)
869 return -ENODEV;
870
871 address = val & ~(VIA686A_EXTENT - 1);
872 if (address == 0) {
873 dev_err(&dev->dev,
874 "base address not set - upgrade BIOS or use force_addr=0xaddr\n");
875 return -ENODEV;
876 }
877
878 ret = pci_read_config_word(dev, VIA686A_ENABLE_REG, &val);
879 if (ret != PCIBIOS_SUCCESSFUL)
880 return -ENODEV;
881 if (!(val & 0x0001)) {
882 if (!force_addr) {
883 dev_warn(&dev->dev,
884 "Sensors disabled, enable with force_addr=0x%x\n",
885 address);
886 return -ENODEV;
887 }
888
889 dev_warn(&dev->dev, "Enabling sensors\n");
890 ret = pci_write_config_word(dev, VIA686A_ENABLE_REG, val | 0x1);
891 if (ret != PCIBIOS_SUCCESSFUL)
892 return -ENODEV;
893 }
894
895 if (platform_driver_register(&via686a_driver))
896 goto exit;
897
898 /* Sets global pdev as a side effect */
899 if (via686a_device_add(address))
900 goto exit_unregister;
901
902 /*
903 * Always return failure here. This is to allow other drivers to bind
904 * to this pci device. We don't really want to have control over the
905 * pci device, we only wanted to read as few register values from it.
906 */
907 s_bridge = pci_dev_get(dev);
908 return -ENODEV;
909
910 exit_unregister:
911 platform_driver_unregister(&via686a_driver);
912 exit:
913 return -ENODEV;
914 }
915
916 static struct pci_driver via686a_pci_driver = {
917 .name = DRIVER_NAME,
918 .id_table = via686a_pci_ids,
919 .probe = via686a_pci_probe,
920 };
921
sm_via686a_init(void)922 static int __init sm_via686a_init(void)
923 {
924 return pci_register_driver(&via686a_pci_driver);
925 }
926
sm_via686a_exit(void)927 static void __exit sm_via686a_exit(void)
928 {
929 pci_unregister_driver(&via686a_pci_driver);
930 if (s_bridge != NULL) {
931 platform_device_unregister(pdev);
932 platform_driver_unregister(&via686a_driver);
933 pci_dev_put(s_bridge);
934 s_bridge = NULL;
935 }
936 }
937
938 MODULE_AUTHOR("Kyösti Mälkki <kmalkki@cc.hut.fi>, "
939 "Mark Studebaker <mdsxyz123@yahoo.com> "
940 "and Bob Dougherty <bobd@stanford.edu>");
941 MODULE_DESCRIPTION("VIA 686A Sensor device");
942 MODULE_LICENSE("GPL");
943
944 module_init(sm_via686a_init);
945 module_exit(sm_via686a_exit);
946