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ACPI: Disable MWAIT via DMI on broken Compal board
[linux-2.6/mini2440.git] / drivers / hwmon / vt8231.c
blob5bc57275cae8e6e8a700373d1670510e442403e9
1 /*
2 vt8231.c - Part of lm_sensors, Linux kernel modules
3 for hardware monitoring
4
5 Copyright (c) 2005 Roger Lucas <vt8231@hiddenengine.co.uk>
6 Copyright (c) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
7 Aaron M. Marsh <amarsh@sdf.lonestar.org>
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 */
23
24 /* Supports VIA VT8231 South Bridge embedded sensors
25 */
26
27 #include <linux/module.h>
28 #include <linux/init.h>
29 #include <linux/slab.h>
30 #include <linux/pci.h>
31 #include <linux/jiffies.h>
32 #include <linux/platform_device.h>
33 #include <linux/hwmon.h>
34 #include <linux/hwmon-sysfs.h>
35 #include <linux/hwmon-vid.h>
36 #include <linux/err.h>
37 #include <linux/mutex.h>
38 #include <asm/io.h>
39
40 static int force_addr;
41 module_param(force_addr, int, 0);
42 MODULE_PARM_DESC(force_addr, "Initialize the base address of the sensors");
43
44 static struct platform_device *pdev;
45
46 #define VT8231_EXTENT 0x80
47 #define VT8231_BASE_REG 0x70
48 #define VT8231_ENABLE_REG 0x74
49
50 /* The VT8231 registers
51
52 The reset value for the input channel configuration is used (Reg 0x4A=0x07)
53 which sets the selected inputs marked with '*' below if multiple options are
54 possible:
55
56 Voltage Mode Temperature Mode
57 Sensor Linux Id Linux Id VIA Id
58 -------- -------- -------- ------
59 CPU Diode N/A temp1 0
60 UIC1 in0 temp2 * 1
61 UIC2 in1 * temp3 2
62 UIC3 in2 * temp4 3
63 UIC4 in3 * temp5 4
64 UIC5 in4 * temp6 5
65 3.3V in5 N/A
66
67 Note that the BIOS may set the configuration register to a different value
68 to match the motherboard configuration.
69 */
70
71 /* fans numbered 0-1 */
72 #define VT8231_REG_FAN_MIN(nr) (0x3b + (nr))
73 #define VT8231_REG_FAN(nr) (0x29 + (nr))
74
75 /* Voltage inputs numbered 0-5 */
76
77 static const u8 regvolt[] = { 0x21, 0x22, 0x23, 0x24, 0x25, 0x26 };
78 static const u8 regvoltmax[] = { 0x3d, 0x2b, 0x2d, 0x2f, 0x31, 0x33 };
79 static const u8 regvoltmin[] = { 0x3e, 0x2c, 0x2e, 0x30, 0x32, 0x34 };
80
81 /* Temperatures are numbered 1-6 according to the Linux kernel specification.
82 **
83 ** In the VIA datasheet, however, the temperatures are numbered from zero.
84 ** Since it is important that this driver can easily be compared to the VIA
85 ** datasheet, we will use the VIA numbering within this driver and map the
86 ** kernel sysfs device name to the VIA number in the sysfs callback.
87 */
88
89 #define VT8231_REG_TEMP_LOW01 0x49
90 #define VT8231_REG_TEMP_LOW25 0x4d
91
92 static const u8 regtemp[] = { 0x1f, 0x21, 0x22, 0x23, 0x24, 0x25 };
93 static const u8 regtempmax[] = { 0x39, 0x3d, 0x2b, 0x2d, 0x2f, 0x31 };
94 static const u8 regtempmin[] = { 0x3a, 0x3e, 0x2c, 0x2e, 0x30, 0x32 };
95
96 #define TEMP_FROM_REG(reg) (((253 * 4 - (reg)) * 550 + 105) / 210)
97 #define TEMP_MAXMIN_FROM_REG(reg) (((253 - (reg)) * 2200 + 105) / 210)
98 #define TEMP_MAXMIN_TO_REG(val) (253 - ((val) * 210 + 1100) / 2200)
99
100 #define VT8231_REG_CONFIG 0x40
101 #define VT8231_REG_ALARM1 0x41
102 #define VT8231_REG_ALARM2 0x42
103 #define VT8231_REG_FANDIV 0x47
104 #define VT8231_REG_UCH_CONFIG 0x4a
105 #define VT8231_REG_TEMP1_CONFIG 0x4b
106 #define VT8231_REG_TEMP2_CONFIG 0x4c
107
108 /* temps 0-5 as numbered in VIA datasheet - see later for mapping to Linux
109 ** numbering
110 */
111 #define ISTEMP(i, ch_config) ((i) == 0 ? 1 : \
112 ((ch_config) >> ((i)+1)) & 0x01)
113 /* voltages 0-5 */
114 #define ISVOLT(i, ch_config) ((i) == 5 ? 1 : \
115 !(((ch_config) >> ((i)+2)) & 0x01))
116
117 #define DIV_FROM_REG(val) (1 << (val))
118
119 /* NB The values returned here are NOT temperatures. The calibration curves
120 ** for the thermistor curves are board-specific and must go in the
121 ** sensors.conf file. Temperature sensors are actually ten bits, but the
122 ** VIA datasheet only considers the 8 MSBs obtained from the regtemp[]
123 ** register. The temperature value returned should have a magnitude of 3,
124 ** so we use the VIA scaling as the "true" scaling and use the remaining 2
125 ** LSBs as fractional precision.
126 **
127 ** All the on-chip hardware temperature comparisons for the alarms are only
128 ** 8-bits wide, and compare against the 8 MSBs of the temperature. The bits
129 ** in the registers VT8231_REG_TEMP_LOW01 and VT8231_REG_TEMP_LOW25 are
130 ** ignored.
131 */
132
133 /******** FAN RPM CONVERSIONS ********
134 ** This chip saturates back at 0, not at 255 like many the other chips.
135 ** So, 0 means 0 RPM
136 */
137 static inline u8 FAN_TO_REG(long rpm, int div)
138 {
139 if (rpm == 0)
140 return 0;
141 return SENSORS_LIMIT(1310720 / (rpm * div), 1, 255);
142 }
143
144 #define FAN_FROM_REG(val, div) ((val) == 0 ? 0 : 1310720 / ((val) * (div)))
145
146 struct vt8231_data {
147 unsigned short addr;
148 const char *name;
149
150 struct mutex update_lock;
151 struct device *hwmon_dev;
152 char valid; /* !=0 if following fields are valid */
153 unsigned long last_updated; /* In jiffies */
154
155 u8 in[6]; /* Register value */
156 u8 in_max[6]; /* Register value */
157 u8 in_min[6]; /* Register value */
158 u16 temp[6]; /* Register value 10 bit, right aligned */
159 u8 temp_max[6]; /* Register value */
160 u8 temp_min[6]; /* Register value */
161 u8 fan[2]; /* Register value */
162 u8 fan_min[2]; /* Register value */
163 u8 fan_div[2]; /* Register encoding, shifted right */
164 u16 alarms; /* Register encoding */
165 u8 uch_config;
166 };
167
168 static struct pci_dev *s_bridge;
169 static int vt8231_probe(struct platform_device *pdev);
170 static int __devexit vt8231_remove(struct platform_device *pdev);
171 static struct vt8231_data *vt8231_update_device(struct device *dev);
172 static void vt8231_init_device(struct vt8231_data *data);
173
174 static inline int vt8231_read_value(struct vt8231_data *data, u8 reg)
175 {
176 return inb_p(data->addr + reg);
177 }
178
179 static inline void vt8231_write_value(struct vt8231_data *data, u8 reg,
180 u8 value)
181 {
182 outb_p(value, data->addr + reg);
183 }
184
185 /* following are the sysfs callback functions */
186 static ssize_t show_in(struct device *dev, struct device_attribute *attr,
187 char *buf)
188 {
189 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
190 int nr = sensor_attr->index;
191 struct vt8231_data *data = vt8231_update_device(dev);
192
193 return sprintf(buf, "%d\n", ((data->in[nr] - 3) * 10000) / 958);
194 }
195
196 static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
197 char *buf)
198 {
199 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
200 int nr = sensor_attr->index;
201 struct vt8231_data *data = vt8231_update_device(dev);
202
203 return sprintf(buf, "%d\n", ((data->in_min[nr] - 3) * 10000) / 958);
204 }
205
206 static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
207 char *buf)
208 {
209 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
210 int nr = sensor_attr->index;
211 struct vt8231_data *data = vt8231_update_device(dev);
212
213 return sprintf(buf, "%d\n", (((data->in_max[nr] - 3) * 10000) / 958));
214 }
215
216 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
217 const char *buf, size_t count)
218 {
219 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
220 int nr = sensor_attr->index;
221 struct vt8231_data *data = dev_get_drvdata(dev);
222 unsigned long val = simple_strtoul(buf, NULL, 10);
223
224 mutex_lock(&data->update_lock);
225 data->in_min[nr] = SENSORS_LIMIT(((val * 958) / 10000) + 3, 0, 255);
226 vt8231_write_value(data, regvoltmin[nr], data->in_min[nr]);
227 mutex_unlock(&data->update_lock);
228 return count;
229 }
230
231 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
232 const char *buf, size_t count)
233 {
234 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
235 int nr = sensor_attr->index;
236 struct vt8231_data *data = dev_get_drvdata(dev);
237 unsigned long val = simple_strtoul(buf, NULL, 10);
238
239 mutex_lock(&data->update_lock);
240 data->in_max[nr] = SENSORS_LIMIT(((val * 958) / 10000) + 3, 0, 255);
241 vt8231_write_value(data, regvoltmax[nr], data->in_max[nr]);
242 mutex_unlock(&data->update_lock);
243 return count;
244 }
245
246 /* Special case for input 5 as this has 3.3V scaling built into the chip */
247 static ssize_t show_in5(struct device *dev, struct device_attribute *attr,
248 char *buf)
249 {
250 struct vt8231_data *data = vt8231_update_device(dev);
251
252 return sprintf(buf, "%d\n",
253 (((data->in[5] - 3) * 10000 * 54) / (958 * 34)));
254 }
255
256 static ssize_t show_in5_min(struct device *dev, struct device_attribute *attr,
257 char *buf)
258 {
259 struct vt8231_data *data = vt8231_update_device(dev);
260
261 return sprintf(buf, "%d\n",
262 (((data->in_min[5] - 3) * 10000 * 54) / (958 * 34)));
263 }
264
265 static ssize_t show_in5_max(struct device *dev, struct device_attribute *attr,
266 char *buf)
267 {
268 struct vt8231_data *data = vt8231_update_device(dev);
269
270 return sprintf(buf, "%d\n",
271 (((data->in_max[5] - 3) * 10000 * 54) / (958 * 34)));
272 }
273
274 static ssize_t set_in5_min(struct device *dev, struct device_attribute *attr,
275 const char *buf, size_t count)
276 {
277 struct vt8231_data *data = dev_get_drvdata(dev);
278 unsigned long val = simple_strtoul(buf, NULL, 10);
279
280 mutex_lock(&data->update_lock);
281 data->in_min[5] = SENSORS_LIMIT(((val * 958 * 34) / (10000 * 54)) + 3,
282 0, 255);
283 vt8231_write_value(data, regvoltmin[5], data->in_min[5]);
284 mutex_unlock(&data->update_lock);
285 return count;
286 }
287
288 static ssize_t set_in5_max(struct device *dev, struct device_attribute *attr,
289 const char *buf, size_t count)
290 {
291 struct vt8231_data *data = dev_get_drvdata(dev);
292 unsigned long val = simple_strtoul(buf, NULL, 10);
293
294 mutex_lock(&data->update_lock);
295 data->in_max[5] = SENSORS_LIMIT(((val * 958 * 34) / (10000 * 54)) + 3,
296 0, 255);
297 vt8231_write_value(data, regvoltmax[5], data->in_max[5]);
298 mutex_unlock(&data->update_lock);
299 return count;
300 }
301
302 #define define_voltage_sysfs(offset) \
303 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
304 show_in, NULL, offset); \
305 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
306 show_in_min, set_in_min, offset); \
307 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
308 show_in_max, set_in_max, offset)
309
310 define_voltage_sysfs(0);
311 define_voltage_sysfs(1);
312 define_voltage_sysfs(2);
313 define_voltage_sysfs(3);
314 define_voltage_sysfs(4);
315
316 static DEVICE_ATTR(in5_input, S_IRUGO, show_in5, NULL);
317 static DEVICE_ATTR(in5_min, S_IRUGO | S_IWUSR, show_in5_min, set_in5_min);
318 static DEVICE_ATTR(in5_max, S_IRUGO | S_IWUSR, show_in5_max, set_in5_max);
319
320 /* Temperatures */
321 static ssize_t show_temp0(struct device *dev, struct device_attribute *attr,
322 char *buf)
323 {
324 struct vt8231_data *data = vt8231_update_device(dev);
325 return sprintf(buf, "%d\n", data->temp[0] * 250);
326 }
327
328 static ssize_t show_temp0_max(struct device *dev, struct device_attribute *attr,
329 char *buf)
330 {
331 struct vt8231_data *data = vt8231_update_device(dev);
332 return sprintf(buf, "%d\n", data->temp_max[0] * 1000);
333 }
334
335 static ssize_t show_temp0_min(struct device *dev, struct device_attribute *attr,
336 char *buf)
337 {
338 struct vt8231_data *data = vt8231_update_device(dev);
339 return sprintf(buf, "%d\n", data->temp_min[0] * 1000);
340 }
341
342 static ssize_t set_temp0_max(struct device *dev, struct device_attribute *attr,
343 const char *buf, size_t count)
344 {
345 struct vt8231_data *data = dev_get_drvdata(dev);
346 int val = simple_strtol(buf, NULL, 10);
347
348 mutex_lock(&data->update_lock);
349 data->temp_max[0] = SENSORS_LIMIT((val + 500) / 1000, 0, 255);
350 vt8231_write_value(data, regtempmax[0], data->temp_max[0]);
351 mutex_unlock(&data->update_lock);
352 return count;
353 }
354 static ssize_t set_temp0_min(struct device *dev, struct device_attribute *attr,
355 const char *buf, size_t count)
356 {
357 struct vt8231_data *data = dev_get_drvdata(dev);
358 int val = simple_strtol(buf, NULL, 10);
359
360 mutex_lock(&data->update_lock);
361 data->temp_min[0] = SENSORS_LIMIT((val + 500) / 1000, 0, 255);
362 vt8231_write_value(data, regtempmin[0], data->temp_min[0]);
363 mutex_unlock(&data->update_lock);
364 return count;
365 }
366
367 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
368 char *buf)
369 {
370 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
371 int nr = sensor_attr->index;
372 struct vt8231_data *data = vt8231_update_device(dev);
373 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
374 }
375
376 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
377 char *buf)
378 {
379 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
380 int nr = sensor_attr->index;
381 struct vt8231_data *data = vt8231_update_device(dev);
382 return sprintf(buf, "%d\n", TEMP_MAXMIN_FROM_REG(data->temp_max[nr]));
383 }
384
385 static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
386 char *buf)
387 {
388 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
389 int nr = sensor_attr->index;
390 struct vt8231_data *data = vt8231_update_device(dev);
391 return sprintf(buf, "%d\n", TEMP_MAXMIN_FROM_REG(data->temp_min[nr]));
392 }
393
394 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
395 const char *buf, size_t count)
396 {
397 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
398 int nr = sensor_attr->index;
399 struct vt8231_data *data = dev_get_drvdata(dev);
400 int val = simple_strtol(buf, NULL, 10);
401
402 mutex_lock(&data->update_lock);
403 data->temp_max[nr] = SENSORS_LIMIT(TEMP_MAXMIN_TO_REG(val), 0, 255);
404 vt8231_write_value(data, regtempmax[nr], data->temp_max[nr]);
405 mutex_unlock(&data->update_lock);
406 return count;
407 }
408 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
409 const char *buf, size_t count)
410 {
411 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
412 int nr = sensor_attr->index;
413 struct vt8231_data *data = dev_get_drvdata(dev);
414 int val = simple_strtol(buf, NULL, 10);
415
416 mutex_lock(&data->update_lock);
417 data->temp_min[nr] = SENSORS_LIMIT(TEMP_MAXMIN_TO_REG(val), 0, 255);
418 vt8231_write_value(data, regtempmin[nr], data->temp_min[nr]);
419 mutex_unlock(&data->update_lock);
420 return count;
421 }
422
423 /* Note that these map the Linux temperature sensor numbering (1-6) to the VIA
424 ** temperature sensor numbering (0-5)
425 */
426 #define define_temperature_sysfs(offset) \
427 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
428 show_temp, NULL, offset - 1); \
429 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
430 show_temp_max, set_temp_max, offset - 1); \
431 static SENSOR_DEVICE_ATTR(temp##offset##_max_hyst, S_IRUGO | S_IWUSR, \
432 show_temp_min, set_temp_min, offset - 1)
433
434 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp0, NULL);
435 static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, show_temp0_max, set_temp0_max);
436 static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR, show_temp0_min, set_temp0_min);
437
438 define_temperature_sysfs(2);
439 define_temperature_sysfs(3);
440 define_temperature_sysfs(4);
441 define_temperature_sysfs(5);
442 define_temperature_sysfs(6);
443
444 /* Fans */
445 static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
446 char *buf)
447 {
448 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
449 int nr = sensor_attr->index;
450 struct vt8231_data *data = vt8231_update_device(dev);
451 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
452 DIV_FROM_REG(data->fan_div[nr])));
453 }
454
455 static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,
456 char *buf)
457 {
458 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
459 int nr = sensor_attr->index;
460 struct vt8231_data *data = vt8231_update_device(dev);
461 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
462 DIV_FROM_REG(data->fan_div[nr])));
463 }
464
465 static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
466 char *buf)
467 {
468 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
469 int nr = sensor_attr->index;
470 struct vt8231_data *data = vt8231_update_device(dev);
471 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
472 }
473
474 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
475 const char *buf, size_t count)
476 {
477 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
478 int nr = sensor_attr->index;
479 struct vt8231_data *data = dev_get_drvdata(dev);
480 int val = simple_strtoul(buf, NULL, 10);
481
482 mutex_lock(&data->update_lock);
483 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
484 vt8231_write_value(data, VT8231_REG_FAN_MIN(nr), data->fan_min[nr]);
485 mutex_unlock(&data->update_lock);
486 return count;
487 }
488
489 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
490 const char *buf, size_t count)
491 {
492 struct vt8231_data *data = dev_get_drvdata(dev);
493 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
494 unsigned long val = simple_strtoul(buf, NULL, 10);
495 int nr = sensor_attr->index;
496 int old = vt8231_read_value(data, VT8231_REG_FANDIV);
497 long min = FAN_FROM_REG(data->fan_min[nr],
498 DIV_FROM_REG(data->fan_div[nr]));
499
500 mutex_lock(&data->update_lock);
501 switch (val) {
502 case 1: data->fan_div[nr] = 0; break;
503 case 2: data->fan_div[nr] = 1; break;
504 case 4: data->fan_div[nr] = 2; break;
505 case 8: data->fan_div[nr] = 3; break;
506 default:
507 dev_err(dev, "fan_div value %ld not supported. "
508 "Choose one of 1, 2, 4 or 8!\n", val);
509 mutex_unlock(&data->update_lock);
510 return -EINVAL;
511 }
512
513 /* Correct the fan minimum speed */
514 data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
515 vt8231_write_value(data, VT8231_REG_FAN_MIN(nr), data->fan_min[nr]);
516
517 old = (old & 0x0f) | (data->fan_div[1] << 6) | (data->fan_div[0] << 4);
518 vt8231_write_value(data, VT8231_REG_FANDIV, old);
519 mutex_unlock(&data->update_lock);
520 return count;
521 }
522
523
524 #define define_fan_sysfs(offset) \
525 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
526 show_fan, NULL, offset - 1); \
527 static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
528 show_fan_div, set_fan_div, offset - 1); \
529 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
530 show_fan_min, set_fan_min, offset - 1)
531
532 define_fan_sysfs(1);
533 define_fan_sysfs(2);
534
535 /* Alarms */
536 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
537 char *buf)
538 {
539 struct vt8231_data *data = vt8231_update_device(dev);
540 return sprintf(buf, "%d\n", data->alarms);
541 }
542 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
543
544 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
545 char *buf)
546 {
547 int bitnr = to_sensor_dev_attr(attr)->index;
548 struct vt8231_data *data = vt8231_update_device(dev);
549 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
550 }
551 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
552 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 11);
553 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 0);
554 static SENSOR_DEVICE_ATTR(temp4_alarm, S_IRUGO, show_alarm, NULL, 1);
555 static SENSOR_DEVICE_ATTR(temp5_alarm, S_IRUGO, show_alarm, NULL, 3);
556 static SENSOR_DEVICE_ATTR(temp6_alarm, S_IRUGO, show_alarm, NULL, 8);
557 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 11);
558 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 0);
559 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 1);
560 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
561 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
562 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 2);
563 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
564 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
565
566 static ssize_t show_name(struct device *dev, struct device_attribute
567 *devattr, char *buf)
568 {
569 struct vt8231_data *data = dev_get_drvdata(dev);
570 return sprintf(buf, "%s\n", data->name);
571 }
572 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
573
574 static struct attribute *vt8231_attributes_temps[6][5] = {
575 {
576 &dev_attr_temp1_input.attr,
577 &dev_attr_temp1_max_hyst.attr,
578 &dev_attr_temp1_max.attr,
579 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
580 NULL
581 }, {
582 &sensor_dev_attr_temp2_input.dev_attr.attr,
583 &sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
584 &sensor_dev_attr_temp2_max.dev_attr.attr,
585 &sensor_dev_attr_temp2_alarm.dev_attr.attr,
586 NULL
587 }, {
588 &sensor_dev_attr_temp3_input.dev_attr.attr,
589 &sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
590 &sensor_dev_attr_temp3_max.dev_attr.attr,
591 &sensor_dev_attr_temp3_alarm.dev_attr.attr,
592 NULL
593 }, {
594 &sensor_dev_attr_temp4_input.dev_attr.attr,
595 &sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
596 &sensor_dev_attr_temp4_max.dev_attr.attr,
597 &sensor_dev_attr_temp4_alarm.dev_attr.attr,
598 NULL
599 }, {
600 &sensor_dev_attr_temp5_input.dev_attr.attr,
601 &sensor_dev_attr_temp5_max_hyst.dev_attr.attr,
602 &sensor_dev_attr_temp5_max.dev_attr.attr,
603 &sensor_dev_attr_temp5_alarm.dev_attr.attr,
604 NULL
605 }, {
606 &sensor_dev_attr_temp6_input.dev_attr.attr,
607 &sensor_dev_attr_temp6_max_hyst.dev_attr.attr,
608 &sensor_dev_attr_temp6_max.dev_attr.attr,
609 &sensor_dev_attr_temp6_alarm.dev_attr.attr,
610 NULL
611 }
612 };
613
614 static const struct attribute_group vt8231_group_temps[6] = {
615 { .attrs = vt8231_attributes_temps[0] },
616 { .attrs = vt8231_attributes_temps[1] },
617 { .attrs = vt8231_attributes_temps[2] },
618 { .attrs = vt8231_attributes_temps[3] },
619 { .attrs = vt8231_attributes_temps[4] },
620 { .attrs = vt8231_attributes_temps[5] },
621 };
622
623 static struct attribute *vt8231_attributes_volts[6][5] = {
624 {
625 &sensor_dev_attr_in0_input.dev_attr.attr,
626 &sensor_dev_attr_in0_min.dev_attr.attr,
627 &sensor_dev_attr_in0_max.dev_attr.attr,
628 &sensor_dev_attr_in0_alarm.dev_attr.attr,
629 NULL
630 }, {
631 &sensor_dev_attr_in1_input.dev_attr.attr,
632 &sensor_dev_attr_in1_min.dev_attr.attr,
633 &sensor_dev_attr_in1_max.dev_attr.attr,
634 &sensor_dev_attr_in1_alarm.dev_attr.attr,
635 NULL
636 }, {
637 &sensor_dev_attr_in2_input.dev_attr.attr,
638 &sensor_dev_attr_in2_min.dev_attr.attr,
639 &sensor_dev_attr_in2_max.dev_attr.attr,
640 &sensor_dev_attr_in2_alarm.dev_attr.attr,
641 NULL
642 }, {
643 &sensor_dev_attr_in3_input.dev_attr.attr,
644 &sensor_dev_attr_in3_min.dev_attr.attr,
645 &sensor_dev_attr_in3_max.dev_attr.attr,
646 &sensor_dev_attr_in3_alarm.dev_attr.attr,
647 NULL
648 }, {
649 &sensor_dev_attr_in4_input.dev_attr.attr,
650 &sensor_dev_attr_in4_min.dev_attr.attr,
651 &sensor_dev_attr_in4_max.dev_attr.attr,
652 &sensor_dev_attr_in4_alarm.dev_attr.attr,
653 NULL
654 }, {
655 &dev_attr_in5_input.attr,
656 &dev_attr_in5_min.attr,
657 &dev_attr_in5_max.attr,
658 &sensor_dev_attr_in5_alarm.dev_attr.attr,
659 NULL
660 }
661 };
662
663 static const struct attribute_group vt8231_group_volts[6] = {
664 { .attrs = vt8231_attributes_volts[0] },
665 { .attrs = vt8231_attributes_volts[1] },
666 { .attrs = vt8231_attributes_volts[2] },
667 { .attrs = vt8231_attributes_volts[3] },
668 { .attrs = vt8231_attributes_volts[4] },
669 { .attrs = vt8231_attributes_volts[5] },
670 };
671
672 static struct attribute *vt8231_attributes[] = {
673 &sensor_dev_attr_fan1_input.dev_attr.attr,
674 &sensor_dev_attr_fan2_input.dev_attr.attr,
675 &sensor_dev_attr_fan1_min.dev_attr.attr,
676 &sensor_dev_attr_fan2_min.dev_attr.attr,
677 &sensor_dev_attr_fan1_div.dev_attr.attr,
678 &sensor_dev_attr_fan2_div.dev_attr.attr,
679 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
680 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
681 &dev_attr_alarms.attr,
682 &dev_attr_name.attr,
683 NULL
684 };
685
686 static const struct attribute_group vt8231_group = {
687 .attrs = vt8231_attributes,
688 };
689
690 static struct platform_driver vt8231_driver = {
691 .driver = {
692 .owner = THIS_MODULE,
693 .name = "vt8231",
694 },
695 .probe = vt8231_probe,
696 .remove = __devexit_p(vt8231_remove),
697 };
698
699 static struct pci_device_id vt8231_pci_ids[] = {
700 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8231_4) },
701 { 0, }
702 };
703
704 MODULE_DEVICE_TABLE(pci, vt8231_pci_ids);
705
706 static int __devinit vt8231_pci_probe(struct pci_dev *dev,
707 const struct pci_device_id *id);
708
709 static struct pci_driver vt8231_pci_driver = {
710 .name = "vt8231",
711 .id_table = vt8231_pci_ids,
712 .probe = vt8231_pci_probe,
713 };
714
715 static int vt8231_probe(struct platform_device *pdev)
716 {
717 struct resource *res;
718 struct vt8231_data *data;
719 int err = 0, i;
720
721 /* Reserve the ISA region */
722 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
723 if (!request_region(res->start, VT8231_EXTENT,
724 vt8231_driver.driver.name)) {
725 dev_err(&pdev->dev, "Region 0x%lx-0x%lx already in use!\n",
726 (unsigned long)res->start, (unsigned long)res->end);
727 return -ENODEV;
728 }
729
730 if (!(data = kzalloc(sizeof(struct vt8231_data), GFP_KERNEL))) {
731 err = -ENOMEM;
732 goto exit_release;
733 }
734
735 platform_set_drvdata(pdev, data);
736 data->addr = res->start;
737 data->name = "vt8231";
738
739 mutex_init(&data->update_lock);
740 vt8231_init_device(data);
741
742 /* Register sysfs hooks */
743 if ((err = sysfs_create_group(&pdev->dev.kobj, &vt8231_group)))
744 goto exit_free;
745
746 /* Must update device information to find out the config field */
747 data->uch_config = vt8231_read_value(data, VT8231_REG_UCH_CONFIG);
748
749 for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++) {
750 if (ISTEMP(i, data->uch_config)) {
751 if ((err = sysfs_create_group(&pdev->dev.kobj,
752 &vt8231_group_temps[i])))
753 goto exit_remove_files;
754 }
755 }
756
757 for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++) {
758 if (ISVOLT(i, data->uch_config)) {
759 if ((err = sysfs_create_group(&pdev->dev.kobj,
760 &vt8231_group_volts[i])))
761 goto exit_remove_files;
762 }
763 }
764
765 data->hwmon_dev = hwmon_device_register(&pdev->dev);
766 if (IS_ERR(data->hwmon_dev)) {
767 err = PTR_ERR(data->hwmon_dev);
768 goto exit_remove_files;
769 }
770 return 0;
771
772 exit_remove_files:
773 for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++)
774 sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_volts[i]);
775
776 for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++)
777 sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_temps[i]);
778
779 sysfs_remove_group(&pdev->dev.kobj, &vt8231_group);
780
781 exit_free:
782 platform_set_drvdata(pdev, NULL);
783 kfree(data);
784
785 exit_release:
786 release_region(res->start, VT8231_EXTENT);
787 return err;
788 }
789
790 static int __devexit vt8231_remove(struct platform_device *pdev)
791 {
792 struct vt8231_data *data = platform_get_drvdata(pdev);
793 int i;
794
795 hwmon_device_unregister(data->hwmon_dev);
796
797 for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++)
798 sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_volts[i]);
799
800 for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++)
801 sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_temps[i]);
802
803 sysfs_remove_group(&pdev->dev.kobj, &vt8231_group);
804
805 release_region(data->addr, VT8231_EXTENT);
806 platform_set_drvdata(pdev, NULL);
807 kfree(data);
808 return 0;
809 }
810
811 static void vt8231_init_device(struct vt8231_data *data)
812 {
813 vt8231_write_value(data, VT8231_REG_TEMP1_CONFIG, 0);
814 vt8231_write_value(data, VT8231_REG_TEMP2_CONFIG, 0);
815 }
816
817 static struct vt8231_data *vt8231_update_device(struct device *dev)
818 {
819 struct vt8231_data *data = dev_get_drvdata(dev);
820 int i;
821 u16 low;
822
823 mutex_lock(&data->update_lock);
824
825 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
826 || !data->valid) {
827 for (i = 0; i < 6; i++) {
828 if (ISVOLT(i, data->uch_config)) {
829 data->in[i] = vt8231_read_value(data,
830 regvolt[i]);
831 data->in_min[i] = vt8231_read_value(data,
832 regvoltmin[i]);
833 data->in_max[i] = vt8231_read_value(data,
834 regvoltmax[i]);
835 }
836 }
837 for (i = 0; i < 2; i++) {
838 data->fan[i] = vt8231_read_value(data,
839 VT8231_REG_FAN(i));
840 data->fan_min[i] = vt8231_read_value(data,
841 VT8231_REG_FAN_MIN(i));
842 }
843
844 low = vt8231_read_value(data, VT8231_REG_TEMP_LOW01);
845 low = (low >> 6) | ((low & 0x30) >> 2)
846 | (vt8231_read_value(data, VT8231_REG_TEMP_LOW25) << 4);
847 for (i = 0; i < 6; i++) {
848 if (ISTEMP(i, data->uch_config)) {
849 data->temp[i] = (vt8231_read_value(data,
850 regtemp[i]) << 2)
851 | ((low >> (2 * i)) & 0x03);
852 data->temp_max[i] = vt8231_read_value(data,
853 regtempmax[i]);
854 data->temp_min[i] = vt8231_read_value(data,
855 regtempmin[i]);
856 }
857 }
858
859 i = vt8231_read_value(data, VT8231_REG_FANDIV);
860 data->fan_div[0] = (i >> 4) & 0x03;
861 data->fan_div[1] = i >> 6;
862 data->alarms = vt8231_read_value(data, VT8231_REG_ALARM1) |
863 (vt8231_read_value(data, VT8231_REG_ALARM2) << 8);
864
865 /* Set alarm flags correctly */
866 if (!data->fan[0] && data->fan_min[0]) {
867 data->alarms |= 0x40;
868 } else if (data->fan[0] && !data->fan_min[0]) {
869 data->alarms &= ~0x40;
870 }
871
872 if (!data->fan[1] && data->fan_min[1]) {
873 data->alarms |= 0x80;
874 } else if (data->fan[1] && !data->fan_min[1]) {
875 data->alarms &= ~0x80;
876 }
877
878 data->last_updated = jiffies;
879 data->valid = 1;
880 }
881
882 mutex_unlock(&data->update_lock);
883
884 return data;
885 }
886
887 static int __devinit vt8231_device_add(unsigned short address)
888 {
889 struct resource res = {
890 .start = address,
891 .end = address + VT8231_EXTENT - 1,
892 .name = "vt8231",
893 .flags = IORESOURCE_IO,
894 };
895 int err;
896
897 pdev = platform_device_alloc("vt8231", address);
898 if (!pdev) {
899 err = -ENOMEM;
900 printk(KERN_ERR "vt8231: Device allocation failed\n");
901 goto exit;
902 }
903
904 err = platform_device_add_resources(pdev, &res, 1);
905 if (err) {
906 printk(KERN_ERR "vt8231: Device resource addition failed "
907 "(%d)\n", err);
908 goto exit_device_put;
909 }
910
911 err = platform_device_add(pdev);
912 if (err) {
913 printk(KERN_ERR "vt8231: Device addition failed (%d)\n",
914 err);
915 goto exit_device_put;
916 }
917
918 return 0;
919
920 exit_device_put:
921 platform_device_put(pdev);
922 exit:
923 return err;
924 }
925
926 static int __devinit vt8231_pci_probe(struct pci_dev *dev,
927 const struct pci_device_id *id)
928 {
929 u16 address, val;
930 if (force_addr) {
931 address = force_addr & 0xff00;
932 dev_warn(&dev->dev, "Forcing ISA address 0x%x\n",
933 address);
934
935 if (PCIBIOS_SUCCESSFUL !=
936 pci_write_config_word(dev, VT8231_BASE_REG, address | 1))
937 return -ENODEV;
938 }
939
940 if (PCIBIOS_SUCCESSFUL != pci_read_config_word(dev, VT8231_BASE_REG,
941 &val))
942 return -ENODEV;
943
944 address = val & ~(VT8231_EXTENT - 1);
945 if (address == 0) {
946 dev_err(&dev->dev, "base address not set -\
947 upgrade BIOS or use force_addr=0xaddr\n");
948 return -ENODEV;
949 }
950
951 if (PCIBIOS_SUCCESSFUL != pci_read_config_word(dev, VT8231_ENABLE_REG,
952 &val))
953 return -ENODEV;
954
955 if (!(val & 0x0001)) {
956 dev_warn(&dev->dev, "enabling sensors\n");
957 if (PCIBIOS_SUCCESSFUL !=
958 pci_write_config_word(dev, VT8231_ENABLE_REG,
959 val | 0x0001))
960 return -ENODEV;
961 }
962
963 if (platform_driver_register(&vt8231_driver))
964 goto exit;
965
966 /* Sets global pdev as a side effect */
967 if (vt8231_device_add(address))
968 goto exit_unregister;
969
970 /* Always return failure here. This is to allow other drivers to bind
971 * to this pci device. We don't really want to have control over the
972 * pci device, we only wanted to read as few register values from it.
973 */
974
975 /* We do, however, mark ourselves as using the PCI device to stop it
976 getting unloaded. */
977 s_bridge = pci_dev_get(dev);
978 return -ENODEV;
979
980 exit_unregister:
981 platform_driver_unregister(&vt8231_driver);
982 exit:
983 return -ENODEV;
984 }
985
986 static int __init sm_vt8231_init(void)
987 {
988 return pci_register_driver(&vt8231_pci_driver);
989 }
990
991 static void __exit sm_vt8231_exit(void)
992 {
993 pci_unregister_driver(&vt8231_pci_driver);
994 if (s_bridge != NULL) {
995 platform_device_unregister(pdev);
996 platform_driver_unregister(&vt8231_driver);
997 pci_dev_put(s_bridge);
998 s_bridge = NULL;
999 }
1000 }
1001
1002 MODULE_AUTHOR("Roger Lucas <vt8231@hiddenengine.co.uk>");
1003 MODULE_DESCRIPTION("VT8231 sensors");
1004 MODULE_LICENSE("GPL");
1005
1006 module_init(sm_vt8231_init);
1007 module_exit(sm_vt8231_exit);
Support for the Chinese Samsung S3C2440 based development boards