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MIPS: Yosemite, Emma: Fix off-by-two in arcs_cmdline buffer size check
[linux-2.6/linux-mips.git] / drivers / hwmon / vt8231.c
blobdb3b2e8d2a671dcc5f40e9008128223d10cc5847
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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
28
29 #include <linux/module.h>
30 #include <linux/init.h>
31 #include <linux/slab.h>
32 #include <linux/pci.h>
33 #include <linux/jiffies.h>
34 #include <linux/platform_device.h>
35 #include <linux/hwmon.h>
36 #include <linux/hwmon-sysfs.h>
37 #include <linux/hwmon-vid.h>
38 #include <linux/err.h>
39 #include <linux/mutex.h>
40 #include <linux/acpi.h>
41 #include <linux/io.h>
42
43 static int force_addr;
44 module_param(force_addr, int, 0);
45 MODULE_PARM_DESC(force_addr, "Initialize the base address of the sensors");
46
47 static struct platform_device *pdev;
48
49 #define VT8231_EXTENT 0x80
50 #define VT8231_BASE_REG 0x70
51 #define VT8231_ENABLE_REG 0x74
52
53 /* The VT8231 registers
54
55 The reset value for the input channel configuration is used (Reg 0x4A=0x07)
56 which sets the selected inputs marked with '*' below if multiple options are
57 possible:
58
59 Voltage Mode Temperature Mode
60 Sensor Linux Id Linux Id VIA Id
61 -------- -------- -------- ------
62 CPU Diode N/A temp1 0
63 UIC1 in0 temp2 * 1
64 UIC2 in1 * temp3 2
65 UIC3 in2 * temp4 3
66 UIC4 in3 * temp5 4
67 UIC5 in4 * temp6 5
68 3.3V in5 N/A
69
70 Note that the BIOS may set the configuration register to a different value
71 to match the motherboard configuration.
72 */
73
74 /* fans numbered 0-1 */
75 #define VT8231_REG_FAN_MIN(nr) (0x3b + (nr))
76 #define VT8231_REG_FAN(nr) (0x29 + (nr))
77
78 /* Voltage inputs numbered 0-5 */
79
80 static const u8 regvolt[] = { 0x21, 0x22, 0x23, 0x24, 0x25, 0x26 };
81 static const u8 regvoltmax[] = { 0x3d, 0x2b, 0x2d, 0x2f, 0x31, 0x33 };
82 static const u8 regvoltmin[] = { 0x3e, 0x2c, 0x2e, 0x30, 0x32, 0x34 };
83
84 /* Temperatures are numbered 1-6 according to the Linux kernel specification.
85 **
86 ** In the VIA datasheet, however, the temperatures are numbered from zero.
87 ** Since it is important that this driver can easily be compared to the VIA
88 ** datasheet, we will use the VIA numbering within this driver and map the
89 ** kernel sysfs device name to the VIA number in the sysfs callback.
90 */
91
92 #define VT8231_REG_TEMP_LOW01 0x49
93 #define VT8231_REG_TEMP_LOW25 0x4d
94
95 static const u8 regtemp[] = { 0x1f, 0x21, 0x22, 0x23, 0x24, 0x25 };
96 static const u8 regtempmax[] = { 0x39, 0x3d, 0x2b, 0x2d, 0x2f, 0x31 };
97 static const u8 regtempmin[] = { 0x3a, 0x3e, 0x2c, 0x2e, 0x30, 0x32 };
98
99 #define TEMP_FROM_REG(reg) (((253 * 4 - (reg)) * 550 + 105) / 210)
100 #define TEMP_MAXMIN_FROM_REG(reg) (((253 - (reg)) * 2200 + 105) / 210)
101 #define TEMP_MAXMIN_TO_REG(val) (253 - ((val) * 210 + 1100) / 2200)
102
103 #define VT8231_REG_CONFIG 0x40
104 #define VT8231_REG_ALARM1 0x41
105 #define VT8231_REG_ALARM2 0x42
106 #define VT8231_REG_FANDIV 0x47
107 #define VT8231_REG_UCH_CONFIG 0x4a
108 #define VT8231_REG_TEMP1_CONFIG 0x4b
109 #define VT8231_REG_TEMP2_CONFIG 0x4c
110
111 /* temps 0-5 as numbered in VIA datasheet - see later for mapping to Linux
112 ** numbering
113 */
114 #define ISTEMP(i, ch_config) ((i) == 0 ? 1 : \
115 ((ch_config) >> ((i)+1)) & 0x01)
116 /* voltages 0-5 */
117 #define ISVOLT(i, ch_config) ((i) == 5 ? 1 : \
118 !(((ch_config) >> ((i)+2)) & 0x01))
119
120 #define DIV_FROM_REG(val) (1 << (val))
121
122 /* NB The values returned here are NOT temperatures. The calibration curves
123 ** for the thermistor curves are board-specific and must go in the
124 ** sensors.conf file. Temperature sensors are actually ten bits, but the
125 ** VIA datasheet only considers the 8 MSBs obtained from the regtemp[]
126 ** register. The temperature value returned should have a magnitude of 3,
127 ** so we use the VIA scaling as the "true" scaling and use the remaining 2
128 ** LSBs as fractional precision.
129 **
130 ** All the on-chip hardware temperature comparisons for the alarms are only
131 ** 8-bits wide, and compare against the 8 MSBs of the temperature. The bits
132 ** in the registers VT8231_REG_TEMP_LOW01 and VT8231_REG_TEMP_LOW25 are
133 ** ignored.
134 */
135
136 /******** FAN RPM CONVERSIONS ********
137 ** This chip saturates back at 0, not at 255 like many the other chips.
138 ** So, 0 means 0 RPM
139 */
140 static inline u8 FAN_TO_REG(long rpm, int div)
141 {
142 if (rpm == 0)
143 return 0;
144 return SENSORS_LIMIT(1310720 / (rpm * div), 1, 255);
145 }
146
147 #define FAN_FROM_REG(val, div) ((val) == 0 ? 0 : 1310720 / ((val) * (div)))
148
149 struct vt8231_data {
150 unsigned short addr;
151 const char *name;
152
153 struct mutex update_lock;
154 struct device *hwmon_dev;
155 char valid; /* !=0 if following fields are valid */
156 unsigned long last_updated; /* In jiffies */
157
158 u8 in[6]; /* Register value */
159 u8 in_max[6]; /* Register value */
160 u8 in_min[6]; /* Register value */
161 u16 temp[6]; /* Register value 10 bit, right aligned */
162 u8 temp_max[6]; /* Register value */
163 u8 temp_min[6]; /* Register value */
164 u8 fan[2]; /* Register value */
165 u8 fan_min[2]; /* Register value */
166 u8 fan_div[2]; /* Register encoding, shifted right */
167 u16 alarms; /* Register encoding */
168 u8 uch_config;
169 };
170
171 static struct pci_dev *s_bridge;
172 static int vt8231_probe(struct platform_device *pdev);
173 static int __devexit vt8231_remove(struct platform_device *pdev);
174 static struct vt8231_data *vt8231_update_device(struct device *dev);
175 static void vt8231_init_device(struct vt8231_data *data);
176
177 static inline int vt8231_read_value(struct vt8231_data *data, u8 reg)
178 {
179 return inb_p(data->addr + reg);
180 }
181
182 static inline void vt8231_write_value(struct vt8231_data *data, u8 reg,
183 u8 value)
184 {
185 outb_p(value, data->addr + reg);
186 }
187
188 /* following are the sysfs callback functions */
189 static ssize_t show_in(struct device *dev, struct device_attribute *attr,
190 char *buf)
191 {
192 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
193 int nr = sensor_attr->index;
194 struct vt8231_data *data = vt8231_update_device(dev);
195
196 return sprintf(buf, "%d\n", ((data->in[nr] - 3) * 10000) / 958);
197 }
198
199 static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
200 char *buf)
201 {
202 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
203 int nr = sensor_attr->index;
204 struct vt8231_data *data = vt8231_update_device(dev);
205
206 return sprintf(buf, "%d\n", ((data->in_min[nr] - 3) * 10000) / 958);
207 }
208
209 static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
210 char *buf)
211 {
212 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
213 int nr = sensor_attr->index;
214 struct vt8231_data *data = vt8231_update_device(dev);
215
216 return sprintf(buf, "%d\n", (((data->in_max[nr] - 3) * 10000) / 958));
217 }
218
219 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
220 const char *buf, size_t count)
221 {
222 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
223 int nr = sensor_attr->index;
224 struct vt8231_data *data = dev_get_drvdata(dev);
225 unsigned long val = simple_strtoul(buf, NULL, 10);
226
227 mutex_lock(&data->update_lock);
228 data->in_min[nr] = SENSORS_LIMIT(((val * 958) / 10000) + 3, 0, 255);
229 vt8231_write_value(data, regvoltmin[nr], data->in_min[nr]);
230 mutex_unlock(&data->update_lock);
231 return count;
232 }
233
234 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
235 const char *buf, size_t count)
236 {
237 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
238 int nr = sensor_attr->index;
239 struct vt8231_data *data = dev_get_drvdata(dev);
240 unsigned long val = simple_strtoul(buf, NULL, 10);
241
242 mutex_lock(&data->update_lock);
243 data->in_max[nr] = SENSORS_LIMIT(((val * 958) / 10000) + 3, 0, 255);
244 vt8231_write_value(data, regvoltmax[nr], data->in_max[nr]);
245 mutex_unlock(&data->update_lock);
246 return count;
247 }
248
249 /* Special case for input 5 as this has 3.3V scaling built into the chip */
250 static ssize_t show_in5(struct device *dev, struct device_attribute *attr,
251 char *buf)
252 {
253 struct vt8231_data *data = vt8231_update_device(dev);
254
255 return sprintf(buf, "%d\n",
256 (((data->in[5] - 3) * 10000 * 54) / (958 * 34)));
257 }
258
259 static ssize_t show_in5_min(struct device *dev, struct device_attribute *attr,
260 char *buf)
261 {
262 struct vt8231_data *data = vt8231_update_device(dev);
263
264 return sprintf(buf, "%d\n",
265 (((data->in_min[5] - 3) * 10000 * 54) / (958 * 34)));
266 }
267
268 static ssize_t show_in5_max(struct device *dev, struct device_attribute *attr,
269 char *buf)
270 {
271 struct vt8231_data *data = vt8231_update_device(dev);
272
273 return sprintf(buf, "%d\n",
274 (((data->in_max[5] - 3) * 10000 * 54) / (958 * 34)));
275 }
276
277 static ssize_t set_in5_min(struct device *dev, struct device_attribute *attr,
278 const char *buf, size_t count)
279 {
280 struct vt8231_data *data = dev_get_drvdata(dev);
281 unsigned long val = simple_strtoul(buf, NULL, 10);
282
283 mutex_lock(&data->update_lock);
284 data->in_min[5] = SENSORS_LIMIT(((val * 958 * 34) / (10000 * 54)) + 3,
285 0, 255);
286 vt8231_write_value(data, regvoltmin[5], data->in_min[5]);
287 mutex_unlock(&data->update_lock);
288 return count;
289 }
290
291 static ssize_t set_in5_max(struct device *dev, struct device_attribute *attr,
292 const char *buf, size_t count)
293 {
294 struct vt8231_data *data = dev_get_drvdata(dev);
295 unsigned long val = simple_strtoul(buf, NULL, 10);
296
297 mutex_lock(&data->update_lock);
298 data->in_max[5] = SENSORS_LIMIT(((val * 958 * 34) / (10000 * 54)) + 3,
299 0, 255);
300 vt8231_write_value(data, regvoltmax[5], data->in_max[5]);
301 mutex_unlock(&data->update_lock);
302 return count;
303 }
304
305 #define define_voltage_sysfs(offset) \
306 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
307 show_in, NULL, offset); \
308 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
309 show_in_min, set_in_min, offset); \
310 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
311 show_in_max, set_in_max, offset)
312
313 define_voltage_sysfs(0);
314 define_voltage_sysfs(1);
315 define_voltage_sysfs(2);
316 define_voltage_sysfs(3);
317 define_voltage_sysfs(4);
318
319 static DEVICE_ATTR(in5_input, S_IRUGO, show_in5, NULL);
320 static DEVICE_ATTR(in5_min, S_IRUGO | S_IWUSR, show_in5_min, set_in5_min);
321 static DEVICE_ATTR(in5_max, S_IRUGO | S_IWUSR, show_in5_max, set_in5_max);
322
323 /* Temperatures */
324 static ssize_t show_temp0(struct device *dev, struct device_attribute *attr,
325 char *buf)
326 {
327 struct vt8231_data *data = vt8231_update_device(dev);
328 return sprintf(buf, "%d\n", data->temp[0] * 250);
329 }
330
331 static ssize_t show_temp0_max(struct device *dev, struct device_attribute *attr,
332 char *buf)
333 {
334 struct vt8231_data *data = vt8231_update_device(dev);
335 return sprintf(buf, "%d\n", data->temp_max[0] * 1000);
336 }
337
338 static ssize_t show_temp0_min(struct device *dev, struct device_attribute *attr,
339 char *buf)
340 {
341 struct vt8231_data *data = vt8231_update_device(dev);
342 return sprintf(buf, "%d\n", data->temp_min[0] * 1000);
343 }
344
345 static ssize_t set_temp0_max(struct device *dev, struct device_attribute *attr,
346 const char *buf, size_t count)
347 {
348 struct vt8231_data *data = dev_get_drvdata(dev);
349 int val = simple_strtol(buf, NULL, 10);
350
351 mutex_lock(&data->update_lock);
352 data->temp_max[0] = SENSORS_LIMIT((val + 500) / 1000, 0, 255);
353 vt8231_write_value(data, regtempmax[0], data->temp_max[0]);
354 mutex_unlock(&data->update_lock);
355 return count;
356 }
357 static ssize_t set_temp0_min(struct device *dev, struct device_attribute *attr,
358 const char *buf, size_t count)
359 {
360 struct vt8231_data *data = dev_get_drvdata(dev);
361 int val = simple_strtol(buf, NULL, 10);
362
363 mutex_lock(&data->update_lock);
364 data->temp_min[0] = SENSORS_LIMIT((val + 500) / 1000, 0, 255);
365 vt8231_write_value(data, regtempmin[0], data->temp_min[0]);
366 mutex_unlock(&data->update_lock);
367 return count;
368 }
369
370 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
371 char *buf)
372 {
373 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
374 int nr = sensor_attr->index;
375 struct vt8231_data *data = vt8231_update_device(dev);
376 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
377 }
378
379 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
380 char *buf)
381 {
382 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
383 int nr = sensor_attr->index;
384 struct vt8231_data *data = vt8231_update_device(dev);
385 return sprintf(buf, "%d\n", TEMP_MAXMIN_FROM_REG(data->temp_max[nr]));
386 }
387
388 static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
389 char *buf)
390 {
391 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
392 int nr = sensor_attr->index;
393 struct vt8231_data *data = vt8231_update_device(dev);
394 return sprintf(buf, "%d\n", TEMP_MAXMIN_FROM_REG(data->temp_min[nr]));
395 }
396
397 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
398 const char *buf, size_t count)
399 {
400 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
401 int nr = sensor_attr->index;
402 struct vt8231_data *data = dev_get_drvdata(dev);
403 int val = simple_strtol(buf, NULL, 10);
404
405 mutex_lock(&data->update_lock);
406 data->temp_max[nr] = SENSORS_LIMIT(TEMP_MAXMIN_TO_REG(val), 0, 255);
407 vt8231_write_value(data, regtempmax[nr], data->temp_max[nr]);
408 mutex_unlock(&data->update_lock);
409 return count;
410 }
411 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
412 const char *buf, size_t count)
413 {
414 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
415 int nr = sensor_attr->index;
416 struct vt8231_data *data = dev_get_drvdata(dev);
417 int val = simple_strtol(buf, NULL, 10);
418
419 mutex_lock(&data->update_lock);
420 data->temp_min[nr] = SENSORS_LIMIT(TEMP_MAXMIN_TO_REG(val), 0, 255);
421 vt8231_write_value(data, regtempmin[nr], data->temp_min[nr]);
422 mutex_unlock(&data->update_lock);
423 return count;
424 }
425
426 /* Note that these map the Linux temperature sensor numbering (1-6) to the VIA
427 ** temperature sensor numbering (0-5)
428 */
429 #define define_temperature_sysfs(offset) \
430 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
431 show_temp, NULL, offset - 1); \
432 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
433 show_temp_max, set_temp_max, offset - 1); \
434 static SENSOR_DEVICE_ATTR(temp##offset##_max_hyst, S_IRUGO | S_IWUSR, \
435 show_temp_min, set_temp_min, offset - 1)
436
437 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp0, NULL);
438 static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, show_temp0_max, set_temp0_max);
439 static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR, show_temp0_min, set_temp0_min);
440
441 define_temperature_sysfs(2);
442 define_temperature_sysfs(3);
443 define_temperature_sysfs(4);
444 define_temperature_sysfs(5);
445 define_temperature_sysfs(6);
446
447 /* Fans */
448 static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
449 char *buf)
450 {
451 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
452 int nr = sensor_attr->index;
453 struct vt8231_data *data = vt8231_update_device(dev);
454 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
455 DIV_FROM_REG(data->fan_div[nr])));
456 }
457
458 static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,
459 char *buf)
460 {
461 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
462 int nr = sensor_attr->index;
463 struct vt8231_data *data = vt8231_update_device(dev);
464 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
465 DIV_FROM_REG(data->fan_div[nr])));
466 }
467
468 static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
469 char *buf)
470 {
471 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
472 int nr = sensor_attr->index;
473 struct vt8231_data *data = vt8231_update_device(dev);
474 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
475 }
476
477 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
478 const char *buf, size_t count)
479 {
480 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
481 int nr = sensor_attr->index;
482 struct vt8231_data *data = dev_get_drvdata(dev);
483 int val = simple_strtoul(buf, NULL, 10);
484
485 mutex_lock(&data->update_lock);
486 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
487 vt8231_write_value(data, VT8231_REG_FAN_MIN(nr), data->fan_min[nr]);
488 mutex_unlock(&data->update_lock);
489 return count;
490 }
491
492 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
493 const char *buf, size_t count)
494 {
495 struct vt8231_data *data = dev_get_drvdata(dev);
496 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
497 unsigned long val = simple_strtoul(buf, NULL, 10);
498 int nr = sensor_attr->index;
499 int old = vt8231_read_value(data, VT8231_REG_FANDIV);
500 long min = FAN_FROM_REG(data->fan_min[nr],
501 DIV_FROM_REG(data->fan_div[nr]));
502
503 mutex_lock(&data->update_lock);
504 switch (val) {
505 case 1: data->fan_div[nr] = 0; break;
506 case 2: data->fan_div[nr] = 1; break;
507 case 4: data->fan_div[nr] = 2; break;
508 case 8: data->fan_div[nr] = 3; break;
509 default:
510 dev_err(dev, "fan_div value %ld not supported. "
511 "Choose one of 1, 2, 4 or 8!\n", val);
512 mutex_unlock(&data->update_lock);
513 return -EINVAL;
514 }
515
516 /* Correct the fan minimum speed */
517 data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
518 vt8231_write_value(data, VT8231_REG_FAN_MIN(nr), data->fan_min[nr]);
519
520 old = (old & 0x0f) | (data->fan_div[1] << 6) | (data->fan_div[0] << 4);
521 vt8231_write_value(data, VT8231_REG_FANDIV, old);
522 mutex_unlock(&data->update_lock);
523 return count;
524 }
525
526
527 #define define_fan_sysfs(offset) \
528 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
529 show_fan, NULL, offset - 1); \
530 static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
531 show_fan_div, set_fan_div, offset - 1); \
532 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
533 show_fan_min, set_fan_min, offset - 1)
534
535 define_fan_sysfs(1);
536 define_fan_sysfs(2);
537
538 /* Alarms */
539 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
540 char *buf)
541 {
542 struct vt8231_data *data = vt8231_update_device(dev);
543 return sprintf(buf, "%d\n", data->alarms);
544 }
545 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
546
547 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
548 char *buf)
549 {
550 int bitnr = to_sensor_dev_attr(attr)->index;
551 struct vt8231_data *data = vt8231_update_device(dev);
552 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
553 }
554 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
555 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 11);
556 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 0);
557 static SENSOR_DEVICE_ATTR(temp4_alarm, S_IRUGO, show_alarm, NULL, 1);
558 static SENSOR_DEVICE_ATTR(temp5_alarm, S_IRUGO, show_alarm, NULL, 3);
559 static SENSOR_DEVICE_ATTR(temp6_alarm, S_IRUGO, show_alarm, NULL, 8);
560 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 11);
561 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 0);
562 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 1);
563 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
564 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
565 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 2);
566 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
567 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
568
569 static ssize_t show_name(struct device *dev, struct device_attribute
570 *devattr, char *buf)
571 {
572 struct vt8231_data *data = dev_get_drvdata(dev);
573 return sprintf(buf, "%s\n", data->name);
574 }
575 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
576
577 static struct attribute *vt8231_attributes_temps[6][5] = {
578 {
579 &dev_attr_temp1_input.attr,
580 &dev_attr_temp1_max_hyst.attr,
581 &dev_attr_temp1_max.attr,
582 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
583 NULL
584 }, {
585 &sensor_dev_attr_temp2_input.dev_attr.attr,
586 &sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
587 &sensor_dev_attr_temp2_max.dev_attr.attr,
588 &sensor_dev_attr_temp2_alarm.dev_attr.attr,
589 NULL
590 }, {
591 &sensor_dev_attr_temp3_input.dev_attr.attr,
592 &sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
593 &sensor_dev_attr_temp3_max.dev_attr.attr,
594 &sensor_dev_attr_temp3_alarm.dev_attr.attr,
595 NULL
596 }, {
597 &sensor_dev_attr_temp4_input.dev_attr.attr,
598 &sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
599 &sensor_dev_attr_temp4_max.dev_attr.attr,
600 &sensor_dev_attr_temp4_alarm.dev_attr.attr,
601 NULL
602 }, {
603 &sensor_dev_attr_temp5_input.dev_attr.attr,
604 &sensor_dev_attr_temp5_max_hyst.dev_attr.attr,
605 &sensor_dev_attr_temp5_max.dev_attr.attr,
606 &sensor_dev_attr_temp5_alarm.dev_attr.attr,
607 NULL
608 }, {
609 &sensor_dev_attr_temp6_input.dev_attr.attr,
610 &sensor_dev_attr_temp6_max_hyst.dev_attr.attr,
611 &sensor_dev_attr_temp6_max.dev_attr.attr,
612 &sensor_dev_attr_temp6_alarm.dev_attr.attr,
613 NULL
614 }
615 };
616
617 static const struct attribute_group vt8231_group_temps[6] = {
618 { .attrs = vt8231_attributes_temps[0] },
619 { .attrs = vt8231_attributes_temps[1] },
620 { .attrs = vt8231_attributes_temps[2] },
621 { .attrs = vt8231_attributes_temps[3] },
622 { .attrs = vt8231_attributes_temps[4] },
623 { .attrs = vt8231_attributes_temps[5] },
624 };
625
626 static struct attribute *vt8231_attributes_volts[6][5] = {
627 {
628 &sensor_dev_attr_in0_input.dev_attr.attr,
629 &sensor_dev_attr_in0_min.dev_attr.attr,
630 &sensor_dev_attr_in0_max.dev_attr.attr,
631 &sensor_dev_attr_in0_alarm.dev_attr.attr,
632 NULL
633 }, {
634 &sensor_dev_attr_in1_input.dev_attr.attr,
635 &sensor_dev_attr_in1_min.dev_attr.attr,
636 &sensor_dev_attr_in1_max.dev_attr.attr,
637 &sensor_dev_attr_in1_alarm.dev_attr.attr,
638 NULL
639 }, {
640 &sensor_dev_attr_in2_input.dev_attr.attr,
641 &sensor_dev_attr_in2_min.dev_attr.attr,
642 &sensor_dev_attr_in2_max.dev_attr.attr,
643 &sensor_dev_attr_in2_alarm.dev_attr.attr,
644 NULL
645 }, {
646 &sensor_dev_attr_in3_input.dev_attr.attr,
647 &sensor_dev_attr_in3_min.dev_attr.attr,
648 &sensor_dev_attr_in3_max.dev_attr.attr,
649 &sensor_dev_attr_in3_alarm.dev_attr.attr,
650 NULL
651 }, {
652 &sensor_dev_attr_in4_input.dev_attr.attr,
653 &sensor_dev_attr_in4_min.dev_attr.attr,
654 &sensor_dev_attr_in4_max.dev_attr.attr,
655 &sensor_dev_attr_in4_alarm.dev_attr.attr,
656 NULL
657 }, {
658 &dev_attr_in5_input.attr,
659 &dev_attr_in5_min.attr,
660 &dev_attr_in5_max.attr,
661 &sensor_dev_attr_in5_alarm.dev_attr.attr,
662 NULL
663 }
664 };
665
666 static const struct attribute_group vt8231_group_volts[6] = {
667 { .attrs = vt8231_attributes_volts[0] },
668 { .attrs = vt8231_attributes_volts[1] },
669 { .attrs = vt8231_attributes_volts[2] },
670 { .attrs = vt8231_attributes_volts[3] },
671 { .attrs = vt8231_attributes_volts[4] },
672 { .attrs = vt8231_attributes_volts[5] },
673 };
674
675 static struct attribute *vt8231_attributes[] = {
676 &sensor_dev_attr_fan1_input.dev_attr.attr,
677 &sensor_dev_attr_fan2_input.dev_attr.attr,
678 &sensor_dev_attr_fan1_min.dev_attr.attr,
679 &sensor_dev_attr_fan2_min.dev_attr.attr,
680 &sensor_dev_attr_fan1_div.dev_attr.attr,
681 &sensor_dev_attr_fan2_div.dev_attr.attr,
682 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
683 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
684 &dev_attr_alarms.attr,
685 &dev_attr_name.attr,
686 NULL
687 };
688
689 static const struct attribute_group vt8231_group = {
690 .attrs = vt8231_attributes,
691 };
692
693 static struct platform_driver vt8231_driver = {
694 .driver = {
695 .owner = THIS_MODULE,
696 .name = "vt8231",
697 },
698 .probe = vt8231_probe,
699 .remove = __devexit_p(vt8231_remove),
700 };
701
702 static const struct pci_device_id vt8231_pci_ids[] = {
703 { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8231_4) },
704 { 0, }
705 };
706
707 MODULE_DEVICE_TABLE(pci, vt8231_pci_ids);
708
709 static int __devinit vt8231_pci_probe(struct pci_dev *dev,
710 const struct pci_device_id *id);
711
712 static struct pci_driver vt8231_pci_driver = {
713 .name = "vt8231",
714 .id_table = vt8231_pci_ids,
715 .probe = vt8231_pci_probe,
716 };
717
718 static int vt8231_probe(struct platform_device *pdev)
719 {
720 struct resource *res;
721 struct vt8231_data *data;
722 int err = 0, i;
723
724 /* Reserve the ISA region */
725 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
726 if (!request_region(res->start, VT8231_EXTENT,
727 vt8231_driver.driver.name)) {
728 dev_err(&pdev->dev, "Region 0x%lx-0x%lx already in use!\n",
729 (unsigned long)res->start, (unsigned long)res->end);
730 return -ENODEV;
731 }
732
733 if (!(data = kzalloc(sizeof(struct vt8231_data), GFP_KERNEL))) {
734 err = -ENOMEM;
735 goto exit_release;
736 }
737
738 platform_set_drvdata(pdev, data);
739 data->addr = res->start;
740 data->name = "vt8231";
741
742 mutex_init(&data->update_lock);
743 vt8231_init_device(data);
744
745 /* Register sysfs hooks */
746 if ((err = sysfs_create_group(&pdev->dev.kobj, &vt8231_group)))
747 goto exit_free;
748
749 /* Must update device information to find out the config field */
750 data->uch_config = vt8231_read_value(data, VT8231_REG_UCH_CONFIG);
751
752 for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++) {
753 if (ISTEMP(i, data->uch_config)) {
754 if ((err = sysfs_create_group(&pdev->dev.kobj,
755 &vt8231_group_temps[i])))
756 goto exit_remove_files;
757 }
758 }
759
760 for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++) {
761 if (ISVOLT(i, data->uch_config)) {
762 if ((err = sysfs_create_group(&pdev->dev.kobj,
763 &vt8231_group_volts[i])))
764 goto exit_remove_files;
765 }
766 }
767
768 data->hwmon_dev = hwmon_device_register(&pdev->dev);
769 if (IS_ERR(data->hwmon_dev)) {
770 err = PTR_ERR(data->hwmon_dev);
771 goto exit_remove_files;
772 }
773 return 0;
774
775 exit_remove_files:
776 for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++)
777 sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_volts[i]);
778
779 for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++)
780 sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_temps[i]);
781
782 sysfs_remove_group(&pdev->dev.kobj, &vt8231_group);
783
784 exit_free:
785 platform_set_drvdata(pdev, NULL);
786 kfree(data);
787
788 exit_release:
789 release_region(res->start, VT8231_EXTENT);
790 return err;
791 }
792
793 static int __devexit vt8231_remove(struct platform_device *pdev)
794 {
795 struct vt8231_data *data = platform_get_drvdata(pdev);
796 int i;
797
798 hwmon_device_unregister(data->hwmon_dev);
799
800 for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++)
801 sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_volts[i]);
802
803 for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++)
804 sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_temps[i]);
805
806 sysfs_remove_group(&pdev->dev.kobj, &vt8231_group);
807
808 release_region(data->addr, VT8231_EXTENT);
809 platform_set_drvdata(pdev, NULL);
810 kfree(data);
811 return 0;
812 }
813
814 static void vt8231_init_device(struct vt8231_data *data)
815 {
816 vt8231_write_value(data, VT8231_REG_TEMP1_CONFIG, 0);
817 vt8231_write_value(data, VT8231_REG_TEMP2_CONFIG, 0);
818 }
819
820 static struct vt8231_data *vt8231_update_device(struct device *dev)
821 {
822 struct vt8231_data *data = dev_get_drvdata(dev);
823 int i;
824 u16 low;
825
826 mutex_lock(&data->update_lock);
827
828 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
829 || !data->valid) {
830 for (i = 0; i < 6; i++) {
831 if (ISVOLT(i, data->uch_config)) {
832 data->in[i] = vt8231_read_value(data,
833 regvolt[i]);
834 data->in_min[i] = vt8231_read_value(data,
835 regvoltmin[i]);
836 data->in_max[i] = vt8231_read_value(data,
837 regvoltmax[i]);
838 }
839 }
840 for (i = 0; i < 2; i++) {
841 data->fan[i] = vt8231_read_value(data,
842 VT8231_REG_FAN(i));
843 data->fan_min[i] = vt8231_read_value(data,
844 VT8231_REG_FAN_MIN(i));
845 }
846
847 low = vt8231_read_value(data, VT8231_REG_TEMP_LOW01);
848 low = (low >> 6) | ((low & 0x30) >> 2)
849 | (vt8231_read_value(data, VT8231_REG_TEMP_LOW25) << 4);
850 for (i = 0; i < 6; i++) {
851 if (ISTEMP(i, data->uch_config)) {
852 data->temp[i] = (vt8231_read_value(data,
853 regtemp[i]) << 2)
854 | ((low >> (2 * i)) & 0x03);
855 data->temp_max[i] = vt8231_read_value(data,
856 regtempmax[i]);
857 data->temp_min[i] = vt8231_read_value(data,
858 regtempmin[i]);
859 }
860 }
861
862 i = vt8231_read_value(data, VT8231_REG_FANDIV);
863 data->fan_div[0] = (i >> 4) & 0x03;
864 data->fan_div[1] = i >> 6;
865 data->alarms = vt8231_read_value(data, VT8231_REG_ALARM1) |
866 (vt8231_read_value(data, VT8231_REG_ALARM2) << 8);
867
868 /* Set alarm flags correctly */
869 if (!data->fan[0] && data->fan_min[0]) {
870 data->alarms |= 0x40;
871 } else if (data->fan[0] && !data->fan_min[0]) {
872 data->alarms &= ~0x40;
873 }
874
875 if (!data->fan[1] && data->fan_min[1]) {
876 data->alarms |= 0x80;
877 } else if (data->fan[1] && !data->fan_min[1]) {
878 data->alarms &= ~0x80;
879 }
880
881 data->last_updated = jiffies;
882 data->valid = 1;
883 }
884
885 mutex_unlock(&data->update_lock);
886
887 return data;
888 }
889
890 static int __devinit vt8231_device_add(unsigned short address)
891 {
892 struct resource res = {
893 .start = address,
894 .end = address + VT8231_EXTENT - 1,
895 .name = "vt8231",
896 .flags = IORESOURCE_IO,
897 };
898 int err;
899
900 err = acpi_check_resource_conflict(&res);
901 if (err)
902 goto exit;
903
904 pdev = platform_device_alloc("vt8231", address);
905 if (!pdev) {
906 err = -ENOMEM;
907 pr_err("Device allocation failed\n");
908 goto exit;
909 }
910
911 err = platform_device_add_resources(pdev, &res, 1);
912 if (err) {
913 pr_err("Device resource addition failed (%d)\n", err);
914 goto exit_device_put;
915 }
916
917 err = platform_device_add(pdev);
918 if (err) {
919 pr_err("Device addition failed (%d)\n", err);
920 goto exit_device_put;
921 }
922
923 return 0;
924
925 exit_device_put:
926 platform_device_put(pdev);
927 exit:
928 return err;
929 }
930
931 static int __devinit vt8231_pci_probe(struct pci_dev *dev,
932 const struct pci_device_id *id)
933 {
934 u16 address, val;
935 if (force_addr) {
936 address = force_addr & 0xff00;
937 dev_warn(&dev->dev, "Forcing ISA address 0x%x\n",
938 address);
939
940 if (PCIBIOS_SUCCESSFUL !=
941 pci_write_config_word(dev, VT8231_BASE_REG, address | 1))
942 return -ENODEV;
943 }
944
945 if (PCIBIOS_SUCCESSFUL != pci_read_config_word(dev, VT8231_BASE_REG,
946 &val))
947 return -ENODEV;
948
949 address = val & ~(VT8231_EXTENT - 1);
950 if (address == 0) {
951 dev_err(&dev->dev, "base address not set - upgrade BIOS or use force_addr=0xaddr\n");
952 return -ENODEV;
953 }
954
955 if (PCIBIOS_SUCCESSFUL != pci_read_config_word(dev, VT8231_ENABLE_REG,
956 &val))
957 return -ENODEV;
958
959 if (!(val & 0x0001)) {
960 dev_warn(&dev->dev, "enabling sensors\n");
961 if (PCIBIOS_SUCCESSFUL !=
962 pci_write_config_word(dev, VT8231_ENABLE_REG,
963 val | 0x0001))
964 return -ENODEV;
965 }
966
967 if (platform_driver_register(&vt8231_driver))
968 goto exit;
969
970 /* Sets global pdev as a side effect */
971 if (vt8231_device_add(address))
972 goto exit_unregister;
973
974 /* Always return failure here. This is to allow other drivers to bind
975 * to this pci device. We don't really want to have control over the
976 * pci device, we only wanted to read as few register values from it.
977 */
978
979 /* We do, however, mark ourselves as using the PCI device to stop it
980 getting unloaded. */
981 s_bridge = pci_dev_get(dev);
982 return -ENODEV;
983
984 exit_unregister:
985 platform_driver_unregister(&vt8231_driver);
986 exit:
987 return -ENODEV;
988 }
989
990 static int __init sm_vt8231_init(void)
991 {
992 return pci_register_driver(&vt8231_pci_driver);
993 }
994
995 static void __exit sm_vt8231_exit(void)
996 {
997 pci_unregister_driver(&vt8231_pci_driver);
998 if (s_bridge != NULL) {
999 platform_device_unregister(pdev);
1000 platform_driver_unregister(&vt8231_driver);
1001 pci_dev_put(s_bridge);
1002 s_bridge = NULL;
1003 }
1004 }
1005
1006 MODULE_AUTHOR("Roger Lucas <vt8231@hiddenengine.co.uk>");
1007 MODULE_DESCRIPTION("VT8231 sensors");
1008 MODULE_LICENSE("GPL");
1009
1010 module_init(sm_vt8231_init);
1011 module_exit(sm_vt8231_exit);
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