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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 <[email protected]>,
7 * Kyösti Mälkki <[email protected]>,
8 * Mark Studebaker <[email protected]>,
9 * and Bob Dougherty <[email protected]>
10 *
11 * (Some conversion-factor data were contributed by Jonathan Teh Soon Yew
12 * <[email protected]> and Alex van Kaam <[email protected]>.)
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 */
43static unsigned short force_addr;
44module_param(force_addr, ushort, 0);
45MODULE_PARM_DESC(force_addr,
46 "Initialize the base address of the sensors");
47
48static 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 */
73static const u8 VIA686A_REG_TEMP[] = { 0x20, 0x21, 0x1f };
74static const u8 VIA686A_REG_TEMP_OVER[] = { 0x39, 0x3d, 0x1d };
75static 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 * <[email protected]>)
115 */
116static 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
136static 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 */
159static 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 <[email protected]>) 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 <[email protected]> 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 */
204static 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 <[email protected]>
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 */
252static 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 */
273static 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 */
283static 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 */
304struct 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
324static struct pci_dev *s_bridge; /* pointer to the (only) via686a */
325
326static inline int via686a_read_value(struct via686a_data *data, u8 reg)
327{
328 return inb_p(data->addr + reg);
329}
330
331static inline void via686a_write_value(struct via686a_data *data, u8 reg,
332 u8 value)
333{
334 outb_p(value, data->addr + reg);
335}
336
337static 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
344static 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 */
411static 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
419static 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
427static 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
435static 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}
454static 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
474static SENSOR_DEVICE_ATTR_RO(in0_input, in, 0);
475static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0);
476static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0);
477static SENSOR_DEVICE_ATTR_RO(in1_input, in, 1);
478static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1);
479static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1);
480static SENSOR_DEVICE_ATTR_RO(in2_input, in, 2);
481static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2);
482static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2);
483static SENSOR_DEVICE_ATTR_RO(in3_input, in, 3);
484static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3);
485static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3);
486static SENSOR_DEVICE_ATTR_RO(in4_input, in, 4);
487static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4);
488static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4);
489
490/* 3 temperatures */
491static 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}
498static 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}
505static 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}
512static 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}
532static 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
553static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
554static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_over, 0);
555static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, temp_hyst, 0);
556static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
557static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_over, 1);
558static SENSOR_DEVICE_ATTR_RW(temp2_max_hyst, temp_hyst, 1);
559static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
560static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_over, 2);
561static SENSOR_DEVICE_ATTR_RW(temp3_max_hyst, temp_hyst, 2);
562
563/* 2 Fans */
564static 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}
572static 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}
581static 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}
588static 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}
606static 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
628static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);
629static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);
630static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
631static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);
632static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
633static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);
634
635/* Alarms */
636static 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
643static DEVICE_ATTR_RO(alarms);
644
645static 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}
652static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0);
653static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1);
654static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2);
655static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3);
656static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8);
657static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4);
658static SENSOR_DEVICE_ATTR_RO(temp2_alarm, alarm, 11);
659static SENSOR_DEVICE_ATTR_RO(temp3_alarm, alarm, 15);
660static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6);
661static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7);
662
663static 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}
669static DEVICE_ATTR_RO(name);
670
671static 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
720static const struct attribute_group via686a_group = {
721 .attrs = via686a_attributes,
722};
723
724static 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 */
743static 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
784exit_remove_files:
785 sysfs_remove_group(&pdev->dev.kobj, &via686a_group);
786 return err;
787}
788
789static void 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
797static struct platform_driver via686a_driver = {
798 .driver = {
799 .name = DRIVER_NAME,
800 },
801 .probe = via686a_probe,
802 .remove = via686a_remove,
803};
804
805static const struct pci_device_id via686a_pci_ids[] = {
806 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_4) },
807 { }
808};
809MODULE_DEVICE_TABLE(pci, via686a_pci_ids);
810
811static int via686a_device_add(unsigned short address)
812{
813 struct resource res = {
814 .start = address,
815 .end = address + VIA686A_EXTENT - 1,
816 .name = DRIVER_NAME,
817 .flags = IORESOURCE_IO,
818 };
819 int err;
820
821 err = acpi_check_resource_conflict(&res);
822 if (err)
823 goto exit;
824
825 pdev = platform_device_alloc(DRIVER_NAME, address);
826 if (!pdev) {
827 err = -ENOMEM;
828 pr_err("Device allocation failed\n");
829 goto exit;
830 }
831
832 err = platform_device_add_resources(pdev, &res, 1);
833 if (err) {
834 pr_err("Device resource addition failed (%d)\n", err);
835 goto exit_device_put;
836 }
837
838 err = platform_device_add(pdev);
839 if (err) {
840 pr_err("Device addition failed (%d)\n", err);
841 goto exit_device_put;
842 }
843
844 return 0;
845
846exit_device_put:
847 platform_device_put(pdev);
848exit:
849 return err;
850}
851
852static int via686a_pci_probe(struct pci_dev *dev,
853 const struct pci_device_id *id)
854{
855 u16 address, val;
856 int ret;
857
858 if (force_addr) {
859 address = force_addr & ~(VIA686A_EXTENT - 1);
860 dev_warn(&dev->dev, "Forcing ISA address 0x%x\n", address);
861 ret = pci_write_config_word(dev, VIA686A_BASE_REG, address | 1);
862 if (ret != PCIBIOS_SUCCESSFUL)
863 return -ENODEV;
864 }
865 ret = pci_read_config_word(dev, VIA686A_BASE_REG, &val);
866 if (ret != PCIBIOS_SUCCESSFUL)
867 return -ENODEV;
868
869 address = val & ~(VIA686A_EXTENT - 1);
870 if (address == 0) {
871 dev_err(&dev->dev,
872 "base address not set - upgrade BIOS or use force_addr=0xaddr\n");
873 return -ENODEV;
874 }
875
876 ret = pci_read_config_word(dev, VIA686A_ENABLE_REG, &val);
877 if (ret != PCIBIOS_SUCCESSFUL)
878 return -ENODEV;
879 if (!(val & 0x0001)) {
880 if (!force_addr) {
881 dev_warn(&dev->dev,
882 "Sensors disabled, enable with force_addr=0x%x\n",
883 address);
884 return -ENODEV;
885 }
886
887 dev_warn(&dev->dev, "Enabling sensors\n");
888 ret = pci_write_config_word(dev, VIA686A_ENABLE_REG, val | 0x1);
889 if (ret != PCIBIOS_SUCCESSFUL)
890 return -ENODEV;
891 }
892
893 if (platform_driver_register(&via686a_driver))
894 goto exit;
895
896 /* Sets global pdev as a side effect */
897 if (via686a_device_add(address))
898 goto exit_unregister;
899
900 /*
901 * Always return failure here. This is to allow other drivers to bind
902 * to this pci device. We don't really want to have control over the
903 * pci device, we only wanted to read as few register values from it.
904 */
905 s_bridge = pci_dev_get(dev);
906 return -ENODEV;
907
908exit_unregister:
909 platform_driver_unregister(&via686a_driver);
910exit:
911 return -ENODEV;
912}
913
914static struct pci_driver via686a_pci_driver = {
915 .name = DRIVER_NAME,
916 .id_table = via686a_pci_ids,
917 .probe = via686a_pci_probe,
918};
919
920static int __init sm_via686a_init(void)
921{
922 return pci_register_driver(&via686a_pci_driver);
923}
924
925static void __exit sm_via686a_exit(void)
926{
927 pci_unregister_driver(&via686a_pci_driver);
928 if (s_bridge != NULL) {
929 platform_device_unregister(pdev);
930 platform_driver_unregister(&via686a_driver);
931 pci_dev_put(s_bridge);
932 s_bridge = NULL;
933 }
934}
935
936MODULE_AUTHOR("Kyösti Mälkki <[email protected]>, "
937 "Mark Studebaker <[email protected]> "
938 "and Bob Dougherty <[email protected]>");
939MODULE_DESCRIPTION("VIA 686A Sensor device");
940MODULE_LICENSE("GPL");
941
942module_init(sm_via686a_init);
943module_exit(sm_via686a_exit);