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 | */ |
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 | |
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 | */ |
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 | */ |
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 */ |
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 | |
326 | static inline int via686a_read_value(struct via686a_data *data, u8 reg) |
327 | { |
328 | return inb_p(port: data->addr + reg); |
329 | } |
330 | |
331 | static inline void via686a_write_value(struct via686a_data *data, u8 reg, |
332 | u8 value) |
333 | { |
334 | outb_p(value, port: data->addr + reg); |
335 | } |
336 | |
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 | |
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 | reg: VIA686A_REG_TEMP[i]) << 2; |
371 | data->temp_over[i] = |
372 | via686a_read_value(data, |
373 | reg: VIA686A_REG_TEMP_OVER[i]); |
374 | data->temp_hyst[i] = |
375 | via686a_read_value(data, |
376 | reg: 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(lock: &data->update_lock); |
404 | |
405 | return data; |
406 | } |
407 | |
408 | /* following are the sysfs callback functions */ |
409 | |
410 | /* 7 voltage sensors */ |
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, fmt: "%ld\n" , IN_FROM_REG(val: data->in[nr], in_num: nr)); |
417 | } |
418 | |
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, fmt: "%ld\n" , IN_FROM_REG(val: data->in_min[nr], in_num: nr)); |
425 | } |
426 | |
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, fmt: "%ld\n" , IN_FROM_REG(val: data->in_max[nr], in_num: nr)); |
433 | } |
434 | |
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(s: buf, base: 10, res: &val); |
444 | if (err) |
445 | return err; |
446 | |
447 | mutex_lock(&data->update_lock); |
448 | data->in_min[nr] = IN_TO_REG(val, in_num: nr); |
449 | via686a_write_value(data, VIA686A_REG_IN_MIN(nr), |
450 | value: data->in_min[nr]); |
451 | mutex_unlock(lock: &data->update_lock); |
452 | return count; |
453 | } |
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(s: buf, base: 10, res: &val); |
463 | if (err) |
464 | return err; |
465 | |
466 | mutex_lock(&data->update_lock); |
467 | data->in_max[nr] = IN_TO_REG(val, in_num: nr); |
468 | via686a_write_value(data, VIA686A_REG_IN_MAX(nr), |
469 | value: data->in_max[nr]); |
470 | mutex_unlock(lock: &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 */ |
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, fmt: "%ld\n" , TEMP_FROM_REG10(val: data->temp[nr])); |
497 | } |
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, fmt: "%ld\n" , TEMP_FROM_REG(data->temp_over[nr])); |
504 | } |
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, fmt: "%ld\n" , TEMP_FROM_REG(data->temp_hyst[nr])); |
511 | } |
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(s: buf, base: 10, res: &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, reg: VIA686A_REG_TEMP_OVER[nr], |
528 | value: data->temp_over[nr]); |
529 | mutex_unlock(lock: &data->update_lock); |
530 | return count; |
531 | } |
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(s: buf, base: 10, res: &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, reg: VIA686A_REG_TEMP_HYST[nr], |
548 | value: data->temp_hyst[nr]); |
549 | mutex_unlock(lock: &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 */ |
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, fmt: "%d\n" , FAN_FROM_REG(data->fan[nr], |
570 | DIV_FROM_REG(data->fan_div[nr]))); |
571 | } |
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, fmt: "%d\n" , |
578 | FAN_FROM_REG(data->fan_min[nr], |
579 | DIV_FROM_REG(data->fan_div[nr]))); |
580 | } |
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, fmt: "%d\n" , DIV_FROM_REG(data->fan_div[nr])); |
587 | } |
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(s: buf, base: 10, res: &val); |
597 | if (err) |
598 | return err; |
599 | |
600 | mutex_lock(&data->update_lock); |
601 | data->fan_min[nr] = FAN_TO_REG(rpm: val, DIV_FROM_REG(data->fan_div[nr])); |
602 | via686a_write_value(data, VIA686A_REG_FAN_MIN(nr+1), value: data->fan_min[nr]); |
603 | mutex_unlock(lock: &data->update_lock); |
604 | return count; |
605 | } |
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(s: buf, base: 10, res: &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, value: old); |
624 | mutex_unlock(lock: &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 */ |
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, fmt: "%u\n" , data->alarms); |
641 | } |
642 | |
643 | static DEVICE_ATTR_RO(alarms); |
644 | |
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, fmt: "%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 | |
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, fmt: "%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 | |
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, value: (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 | value: (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 */ |
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(dev: &pdev->dev, size: 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(kobj: &pdev->dev.kobj, grp: &via686a_group); |
773 | if (err) |
774 | return err; |
775 | |
776 | data->hwmon_dev = hwmon_device_register(dev: &pdev->dev); |
777 | if (IS_ERR(ptr: data->hwmon_dev)) { |
778 | err = PTR_ERR(ptr: data->hwmon_dev); |
779 | goto exit_remove_files; |
780 | } |
781 | |
782 | return 0; |
783 | |
784 | exit_remove_files: |
785 | sysfs_remove_group(kobj: &pdev->dev.kobj, grp: &via686a_group); |
786 | return err; |
787 | } |
788 | |
789 | static void via686a_remove(struct platform_device *pdev) |
790 | { |
791 | struct via686a_data *data = platform_get_drvdata(pdev); |
792 | |
793 | hwmon_device_unregister(dev: data->hwmon_dev); |
794 | sysfs_remove_group(kobj: &pdev->dev.kobj, grp: &via686a_group); |
795 | } |
796 | |
797 | static struct platform_driver via686a_driver = { |
798 | .driver = { |
799 | .name = DRIVER_NAME, |
800 | }, |
801 | .probe = via686a_probe, |
802 | .remove_new = via686a_remove, |
803 | }; |
804 | |
805 | static const struct pci_device_id via686a_pci_ids[] = { |
806 | { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_4) }, |
807 | { } |
808 | }; |
809 | MODULE_DEVICE_TABLE(pci, via686a_pci_ids); |
810 | |
811 | static 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: &res); |
822 | if (err) |
823 | goto exit; |
824 | |
825 | pdev = platform_device_alloc(DRIVER_NAME, id: 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: &res, num: 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 | |
846 | exit_device_put: |
847 | platform_device_put(pdev); |
848 | exit: |
849 | return err; |
850 | } |
851 | |
852 | static 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, val: address | 1); |
862 | if (ret != PCIBIOS_SUCCESSFUL) |
863 | return -ENODEV; |
864 | } |
865 | ret = pci_read_config_word(dev, VIA686A_BASE_REG, val: &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: &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: 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 | |
908 | exit_unregister: |
909 | platform_driver_unregister(&via686a_driver); |
910 | exit: |
911 | return -ENODEV; |
912 | } |
913 | |
914 | static struct pci_driver via686a_pci_driver = { |
915 | .name = DRIVER_NAME, |
916 | .id_table = via686a_pci_ids, |
917 | .probe = via686a_pci_probe, |
918 | }; |
919 | |
920 | static int __init sm_via686a_init(void) |
921 | { |
922 | return pci_register_driver(&via686a_pci_driver); |
923 | } |
924 | |
925 | static void __exit sm_via686a_exit(void) |
926 | { |
927 | pci_unregister_driver(dev: &via686a_pci_driver); |
928 | if (s_bridge != NULL) { |
929 | platform_device_unregister(pdev); |
930 | platform_driver_unregister(&via686a_driver); |
931 | pci_dev_put(dev: s_bridge); |
932 | s_bridge = NULL; |
933 | } |
934 | } |
935 | |
936 | MODULE_AUTHOR("Kyösti Mälkki <kmalkki@cc.hut.fi>, " |
937 | "Mark Studebaker <mdsxyz123@yahoo.com> " |
938 | "and Bob Dougherty <bobd@stanford.edu>" ); |
939 | MODULE_DESCRIPTION("VIA 686A Sensor device" ); |
940 | MODULE_LICENSE("GPL" ); |
941 | |
942 | module_init(sm_via686a_init); |
943 | module_exit(sm_via686a_exit); |
944 | |