Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/drivers/hwmon/vt8231.c

  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 /*
 25  * Supports VIA VT8231 South Bridge embedded sensors
 26  */
 27 
 28 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 29 
 30 #include <linux/module.h>
 31 #include <linux/init.h>
 32 #include <linux/slab.h>
 33 #include <linux/pci.h>
 34 #include <linux/jiffies.h>
 35 #include <linux/platform_device.h>
 36 #include <linux/hwmon.h>
 37 #include <linux/hwmon-sysfs.h>
 38 #include <linux/hwmon-vid.h>
 39 #include <linux/err.h>
 40 #include <linux/mutex.h>
 41 #include <linux/acpi.h>
 42 #include <linux/io.h>
 43 
 44 static int force_addr;
 45 module_param(force_addr, int, 0);
 46 MODULE_PARM_DESC(force_addr, "Initialize the base address of the sensors");
 47 
 48 static struct platform_device *pdev;
 49 
 50 #define VT8231_EXTENT 0x80
 51 #define VT8231_BASE_REG 0x70
 52 #define VT8231_ENABLE_REG 0x74
 53 
 54 /*
 55  * The VT8231 registers
 56  *
 57  * The reset value for the input channel configuration is used (Reg 0x4A=0x07)
 58  * which sets the selected inputs marked with '*' below if multiple options are
 59  * possible:
 60  *
 61  *                  Voltage Mode          Temperature Mode
 62  *      Sensor        Linux Id        Linux Id        VIA Id
 63  *      --------      --------        --------        ------
 64  *      CPU Diode       N/A             temp1           0
 65  *      UIC1            in0             temp2 *         1
 66  *      UIC2            in1 *           temp3           2
 67  *      UIC3            in2 *           temp4           3
 68  *      UIC4            in3 *           temp5           4
 69  *      UIC5            in4 *           temp6           5
 70  *      3.3V            in5             N/A
 71  *
 72  * Note that the BIOS may set the configuration register to a different value
 73  * to match the motherboard configuration.
 74  */
 75 
 76 /* fans numbered 0-1 */
 77 #define VT8231_REG_FAN_MIN(nr)  (0x3b + (nr))
 78 #define VT8231_REG_FAN(nr)      (0x29 + (nr))
 79 
 80 /* Voltage inputs numbered 0-5 */
 81 
 82 static const u8 regvolt[]    = { 0x21, 0x22, 0x23, 0x24, 0x25, 0x26 };
 83 static const u8 regvoltmax[] = { 0x3d, 0x2b, 0x2d, 0x2f, 0x31, 0x33 };
 84 static const u8 regvoltmin[] = { 0x3e, 0x2c, 0x2e, 0x30, 0x32, 0x34 };
 85 
 86 /*
 87  * Temperatures are numbered 1-6 according to the Linux kernel specification.
 88  *
 89  * In the VIA datasheet, however, the temperatures are numbered from zero.
 90  * Since it is important that this driver can easily be compared to the VIA
 91  * datasheet, we will use the VIA numbering within this driver and map the
 92  * kernel sysfs device name to the VIA number in the sysfs callback.
 93  */
 94 
 95 #define VT8231_REG_TEMP_LOW01   0x49
 96 #define VT8231_REG_TEMP_LOW25   0x4d
 97 
 98 static const u8 regtemp[]    = { 0x1f, 0x21, 0x22, 0x23, 0x24, 0x25 };
 99 static const u8 regtempmax[] = { 0x39, 0x3d, 0x2b, 0x2d, 0x2f, 0x31 };
100 static const u8 regtempmin[] = { 0x3a, 0x3e, 0x2c, 0x2e, 0x30, 0x32 };
101 
102 #define TEMP_FROM_REG(reg)              (((253 * 4 - (reg)) * 550 + 105) / 210)
103 #define TEMP_MAXMIN_FROM_REG(reg)       (((253 - (reg)) * 2200 + 105) / 210)
104 #define TEMP_MAXMIN_TO_REG(val)         (253 - ((val) * 210 + 1100) / 2200)
105 
106 #define VT8231_REG_CONFIG 0x40
107 #define VT8231_REG_ALARM1 0x41
108 #define VT8231_REG_ALARM2 0x42
109 #define VT8231_REG_FANDIV 0x47
110 #define VT8231_REG_UCH_CONFIG 0x4a
111 #define VT8231_REG_TEMP1_CONFIG 0x4b
112 #define VT8231_REG_TEMP2_CONFIG 0x4c
113 
114 /*
115  * temps 0-5 as numbered in VIA datasheet - see later for mapping to Linux
116  * numbering
117  */
118 #define ISTEMP(i, ch_config) ((i) == 0 ? 1 : \
119                               ((ch_config) >> ((i)+1)) & 0x01)
120 /* voltages 0-5 */
121 #define ISVOLT(i, ch_config) ((i) == 5 ? 1 : \
122                               !(((ch_config) >> ((i)+2)) & 0x01))
123 
124 #define DIV_FROM_REG(val) (1 << (val))
125 
126 /*
127  * NB  The values returned here are NOT temperatures.  The calibration curves
128  *     for the thermistor curves are board-specific and must go in the
129  *     sensors.conf file.  Temperature sensors are actually ten bits, but the
130  *     VIA datasheet only considers the 8 MSBs obtained from the regtemp[]
131  *     register.  The temperature value returned should have a magnitude of 3,
132  *     so we use the VIA scaling as the "true" scaling and use the remaining 2
133  *     LSBs as fractional precision.
134  *
135  *     All the on-chip hardware temperature comparisons for the alarms are only
136  *     8-bits wide, and compare against the 8 MSBs of the temperature.  The bits
137  *     in the registers VT8231_REG_TEMP_LOW01 and VT8231_REG_TEMP_LOW25 are
138  *     ignored.
139  */
140 
141 /*
142  ****** FAN RPM CONVERSIONS ********
143  * This chip saturates back at 0, not at 255 like many the other chips.
144  * So, 0 means 0 RPM
145  */
146 static inline u8 FAN_TO_REG(long rpm, int div)
147 {
148         if (rpm <= 0 || rpm > 1310720)
149                 return 0;
150         return clamp_val(1310720 / (rpm * div), 1, 255);
151 }
152 
153 #define FAN_FROM_REG(val, div) ((val) == 0 ? 0 : 1310720 / ((val) * (div)))
154 
155 struct vt8231_data {
156         unsigned short addr;
157         const char *name;
158 
159         struct mutex update_lock;
160         struct device *hwmon_dev;
161         char valid;             /* !=0 if following fields are valid */
162         unsigned long last_updated;     /* In jiffies */
163 
164         u8 in[6];               /* Register value */
165         u8 in_max[6];           /* Register value */
166         u8 in_min[6];           /* Register value */
167         u16 temp[6];            /* Register value 10 bit, right aligned */
168         u8 temp_max[6];         /* Register value */
169         u8 temp_min[6];         /* Register value */
170         u8 fan[2];              /* Register value */
171         u8 fan_min[2];          /* Register value */
172         u8 fan_div[2];          /* Register encoding, shifted right */
173         u16 alarms;             /* Register encoding */
174         u8 uch_config;
175 };
176 
177 static struct pci_dev *s_bridge;
178 static int vt8231_probe(struct platform_device *pdev);
179 static int vt8231_remove(struct platform_device *pdev);
180 static struct vt8231_data *vt8231_update_device(struct device *dev);
181 static void vt8231_init_device(struct vt8231_data *data);
182 
183 static inline int vt8231_read_value(struct vt8231_data *data, u8 reg)
184 {
185         return inb_p(data->addr + reg);
186 }
187 
188 static inline void vt8231_write_value(struct vt8231_data *data, u8 reg,
189                                         u8 value)
190 {
191         outb_p(value, data->addr + reg);
192 }
193 
194 /* following are the sysfs callback functions */
195 static ssize_t show_in(struct device *dev, struct device_attribute *attr,
196                 char *buf)
197 {
198         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
199         int nr = sensor_attr->index;
200         struct vt8231_data *data = vt8231_update_device(dev);
201 
202         return sprintf(buf, "%d\n", ((data->in[nr] - 3) * 10000) / 958);
203 }
204 
205 static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
206                 char *buf)
207 {
208         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
209         int nr = sensor_attr->index;
210         struct vt8231_data *data = vt8231_update_device(dev);
211 
212         return sprintf(buf, "%d\n", ((data->in_min[nr] - 3) * 10000) / 958);
213 }
214 
215 static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
216                 char *buf)
217 {
218         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
219         int nr = sensor_attr->index;
220         struct vt8231_data *data = vt8231_update_device(dev);
221 
222         return sprintf(buf, "%d\n", (((data->in_max[nr] - 3) * 10000) / 958));
223 }
224 
225 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
226                 const char *buf, size_t count)
227 {
228         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
229         int nr = sensor_attr->index;
230         struct vt8231_data *data = dev_get_drvdata(dev);
231         unsigned long val;
232         int err;
233 
234         err = kstrtoul(buf, 10, &val);
235         if (err)
236                 return err;
237 
238         mutex_lock(&data->update_lock);
239         data->in_min[nr] = clamp_val(((val * 958) / 10000) + 3, 0, 255);
240         vt8231_write_value(data, regvoltmin[nr], data->in_min[nr]);
241         mutex_unlock(&data->update_lock);
242         return count;
243 }
244 
245 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
246                 const char *buf, size_t count)
247 {
248         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
249         int nr = sensor_attr->index;
250         struct vt8231_data *data = dev_get_drvdata(dev);
251         unsigned long val;
252         int err;
253 
254         err = kstrtoul(buf, 10, &val);
255         if (err)
256                 return err;
257 
258         mutex_lock(&data->update_lock);
259         data->in_max[nr] = clamp_val(((val * 958) / 10000) + 3, 0, 255);
260         vt8231_write_value(data, regvoltmax[nr], data->in_max[nr]);
261         mutex_unlock(&data->update_lock);
262         return count;
263 }
264 
265 /* Special case for input 5 as this has 3.3V scaling built into the chip */
266 static ssize_t show_in5(struct device *dev, struct device_attribute *attr,
267                 char *buf)
268 {
269         struct vt8231_data *data = vt8231_update_device(dev);
270 
271         return sprintf(buf, "%d\n",
272                 (((data->in[5] - 3) * 10000 * 54) / (958 * 34)));
273 }
274 
275 static ssize_t show_in5_min(struct device *dev, struct device_attribute *attr,
276                 char *buf)
277 {
278         struct vt8231_data *data = vt8231_update_device(dev);
279 
280         return sprintf(buf, "%d\n",
281                 (((data->in_min[5] - 3) * 10000 * 54) / (958 * 34)));
282 }
283 
284 static ssize_t show_in5_max(struct device *dev, struct device_attribute *attr,
285                 char *buf)
286 {
287         struct vt8231_data *data = vt8231_update_device(dev);
288 
289         return sprintf(buf, "%d\n",
290                 (((data->in_max[5] - 3) * 10000 * 54) / (958 * 34)));
291 }
292 
293 static ssize_t set_in5_min(struct device *dev, struct device_attribute *attr,
294                 const char *buf, size_t count)
295 {
296         struct vt8231_data *data = dev_get_drvdata(dev);
297         unsigned long val;
298         int err;
299 
300         err = kstrtoul(buf, 10, &val);
301         if (err)
302                 return err;
303 
304         mutex_lock(&data->update_lock);
305         data->in_min[5] = clamp_val(((val * 958 * 34) / (10000 * 54)) + 3,
306                                     0, 255);
307         vt8231_write_value(data, regvoltmin[5], data->in_min[5]);
308         mutex_unlock(&data->update_lock);
309         return count;
310 }
311 
312 static ssize_t set_in5_max(struct device *dev, struct device_attribute *attr,
313                 const char *buf, size_t count)
314 {
315         struct vt8231_data *data = dev_get_drvdata(dev);
316         unsigned long val;
317         int err;
318 
319         err = kstrtoul(buf, 10, &val);
320         if (err)
321                 return err;
322 
323         mutex_lock(&data->update_lock);
324         data->in_max[5] = clamp_val(((val * 958 * 34) / (10000 * 54)) + 3,
325                                     0, 255);
326         vt8231_write_value(data, regvoltmax[5], data->in_max[5]);
327         mutex_unlock(&data->update_lock);
328         return count;
329 }
330 
331 #define define_voltage_sysfs(offset)                            \
332 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO,          \
333                 show_in, NULL, offset);                         \
334 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,  \
335                 show_in_min, set_in_min, offset);               \
336 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,  \
337                 show_in_max, set_in_max, offset)
338 
339 define_voltage_sysfs(0);
340 define_voltage_sysfs(1);
341 define_voltage_sysfs(2);
342 define_voltage_sysfs(3);
343 define_voltage_sysfs(4);
344 
345 static DEVICE_ATTR(in5_input, S_IRUGO, show_in5, NULL);
346 static DEVICE_ATTR(in5_min, S_IRUGO | S_IWUSR, show_in5_min, set_in5_min);
347 static DEVICE_ATTR(in5_max, S_IRUGO | S_IWUSR, show_in5_max, set_in5_max);
348 
349 /* Temperatures */
350 static ssize_t show_temp0(struct device *dev, struct device_attribute *attr,
351                 char *buf)
352 {
353         struct vt8231_data *data = vt8231_update_device(dev);
354         return sprintf(buf, "%d\n", data->temp[0] * 250);
355 }
356 
357 static ssize_t show_temp0_max(struct device *dev, struct device_attribute *attr,
358                 char *buf)
359 {
360         struct vt8231_data *data = vt8231_update_device(dev);
361         return sprintf(buf, "%d\n", data->temp_max[0] * 1000);
362 }
363 
364 static ssize_t show_temp0_min(struct device *dev, struct device_attribute *attr,
365                 char *buf)
366 {
367         struct vt8231_data *data = vt8231_update_device(dev);
368         return sprintf(buf, "%d\n", data->temp_min[0] * 1000);
369 }
370 
371 static ssize_t set_temp0_max(struct device *dev, struct device_attribute *attr,
372                 const char *buf, size_t count)
373 {
374         struct vt8231_data *data = dev_get_drvdata(dev);
375         long val;
376         int err;
377 
378         err = kstrtol(buf, 10, &val);
379         if (err)
380                 return err;
381 
382         mutex_lock(&data->update_lock);
383         data->temp_max[0] = clamp_val((val + 500) / 1000, 0, 255);
384         vt8231_write_value(data, regtempmax[0], data->temp_max[0]);
385         mutex_unlock(&data->update_lock);
386         return count;
387 }
388 static ssize_t set_temp0_min(struct device *dev, struct device_attribute *attr,
389                 const char *buf, size_t count)
390 {
391         struct vt8231_data *data = dev_get_drvdata(dev);
392         long val;
393         int err;
394 
395         err = kstrtol(buf, 10, &val);
396         if (err)
397                 return err;
398 
399         mutex_lock(&data->update_lock);
400         data->temp_min[0] = clamp_val((val + 500) / 1000, 0, 255);
401         vt8231_write_value(data, regtempmin[0], data->temp_min[0]);
402         mutex_unlock(&data->update_lock);
403         return count;
404 }
405 
406 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
407                 char *buf)
408 {
409         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
410         int nr = sensor_attr->index;
411         struct vt8231_data *data = vt8231_update_device(dev);
412         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
413 }
414 
415 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
416                 char *buf)
417 {
418         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
419         int nr = sensor_attr->index;
420         struct vt8231_data *data = vt8231_update_device(dev);
421         return sprintf(buf, "%d\n", TEMP_MAXMIN_FROM_REG(data->temp_max[nr]));
422 }
423 
424 static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
425                 char *buf)
426 {
427         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
428         int nr = sensor_attr->index;
429         struct vt8231_data *data = vt8231_update_device(dev);
430         return sprintf(buf, "%d\n", TEMP_MAXMIN_FROM_REG(data->temp_min[nr]));
431 }
432 
433 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
434                 const char *buf, size_t count)
435 {
436         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
437         int nr = sensor_attr->index;
438         struct vt8231_data *data = dev_get_drvdata(dev);
439         long val;
440         int err;
441 
442         err = kstrtol(buf, 10, &val);
443         if (err)
444                 return err;
445 
446         mutex_lock(&data->update_lock);
447         data->temp_max[nr] = clamp_val(TEMP_MAXMIN_TO_REG(val), 0, 255);
448         vt8231_write_value(data, regtempmax[nr], data->temp_max[nr]);
449         mutex_unlock(&data->update_lock);
450         return count;
451 }
452 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
453                 const char *buf, size_t count)
454 {
455         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
456         int nr = sensor_attr->index;
457         struct vt8231_data *data = dev_get_drvdata(dev);
458         long val;
459         int err;
460 
461         err = kstrtol(buf, 10, &val);
462         if (err)
463                 return err;
464 
465         mutex_lock(&data->update_lock);
466         data->temp_min[nr] = clamp_val(TEMP_MAXMIN_TO_REG(val), 0, 255);
467         vt8231_write_value(data, regtempmin[nr], data->temp_min[nr]);
468         mutex_unlock(&data->update_lock);
469         return count;
470 }
471 
472 /*
473  * Note that these map the Linux temperature sensor numbering (1-6) to the VIA
474  * temperature sensor numbering (0-5)
475  */
476 #define define_temperature_sysfs(offset)                                \
477 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO,                \
478                 show_temp, NULL, offset - 1);                           \
479 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,        \
480                 show_temp_max, set_temp_max, offset - 1);               \
481 static SENSOR_DEVICE_ATTR(temp##offset##_max_hyst, S_IRUGO | S_IWUSR,   \
482                 show_temp_min, set_temp_min, offset - 1)
483 
484 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp0, NULL);
485 static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, show_temp0_max, set_temp0_max);
486 static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR, show_temp0_min,
487                    set_temp0_min);
488 
489 define_temperature_sysfs(2);
490 define_temperature_sysfs(3);
491 define_temperature_sysfs(4);
492 define_temperature_sysfs(5);
493 define_temperature_sysfs(6);
494 
495 /* Fans */
496 static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
497                 char *buf)
498 {
499         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
500         int nr = sensor_attr->index;
501         struct vt8231_data *data = vt8231_update_device(dev);
502         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
503                                 DIV_FROM_REG(data->fan_div[nr])));
504 }
505 
506 static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,
507                 char *buf)
508 {
509         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
510         int nr = sensor_attr->index;
511         struct vt8231_data *data = vt8231_update_device(dev);
512         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
513                         DIV_FROM_REG(data->fan_div[nr])));
514 }
515 
516 static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
517                 char *buf)
518 {
519         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
520         int nr = sensor_attr->index;
521         struct vt8231_data *data = vt8231_update_device(dev);
522         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
523 }
524 
525 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
526                 const char *buf, size_t count)
527 {
528         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
529         int nr = sensor_attr->index;
530         struct vt8231_data *data = dev_get_drvdata(dev);
531         unsigned long val;
532         int err;
533 
534         err = kstrtoul(buf, 10, &val);
535         if (err)
536                 return err;
537 
538         mutex_lock(&data->update_lock);
539         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
540         vt8231_write_value(data, VT8231_REG_FAN_MIN(nr), data->fan_min[nr]);
541         mutex_unlock(&data->update_lock);
542         return count;
543 }
544 
545 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
546                 const char *buf, size_t count)
547 {
548         struct vt8231_data *data = dev_get_drvdata(dev);
549         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
550         unsigned long val;
551         int nr = sensor_attr->index;
552         int old = vt8231_read_value(data, VT8231_REG_FANDIV);
553         long min = FAN_FROM_REG(data->fan_min[nr],
554                                  DIV_FROM_REG(data->fan_div[nr]));
555         int err;
556 
557         err = kstrtoul(buf, 10, &val);
558         if (err)
559                 return err;
560 
561         mutex_lock(&data->update_lock);
562         switch (val) {
563         case 1:
564                 data->fan_div[nr] = 0;
565                 break;
566         case 2:
567                 data->fan_div[nr] = 1;
568                 break;
569         case 4:
570                 data->fan_div[nr] = 2;
571                 break;
572         case 8:
573                 data->fan_div[nr] = 3;
574                 break;
575         default:
576                 dev_err(dev,
577                         "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n",
578                         val);
579                 mutex_unlock(&data->update_lock);
580                 return -EINVAL;
581         }
582 
583         /* Correct the fan minimum speed */
584         data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
585         vt8231_write_value(data, VT8231_REG_FAN_MIN(nr), data->fan_min[nr]);
586 
587         old = (old & 0x0f) | (data->fan_div[1] << 6) | (data->fan_div[0] << 4);
588         vt8231_write_value(data, VT8231_REG_FANDIV, old);
589         mutex_unlock(&data->update_lock);
590         return count;
591 }
592 
593 
594 #define define_fan_sysfs(offset)                                        \
595 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO,                 \
596                 show_fan, NULL, offset - 1);                            \
597 static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR,         \
598                 show_fan_div, set_fan_div, offset - 1);                 \
599 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR,         \
600                 show_fan_min, set_fan_min, offset - 1)
601 
602 define_fan_sysfs(1);
603 define_fan_sysfs(2);
604 
605 /* Alarms */
606 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
607                            char *buf)
608 {
609         struct vt8231_data *data = vt8231_update_device(dev);
610         return sprintf(buf, "%d\n", data->alarms);
611 }
612 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
613 
614 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
615                           char *buf)
616 {
617         int bitnr = to_sensor_dev_attr(attr)->index;
618         struct vt8231_data *data = vt8231_update_device(dev);
619         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
620 }
621 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
622 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 11);
623 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 0);
624 static SENSOR_DEVICE_ATTR(temp4_alarm, S_IRUGO, show_alarm, NULL, 1);
625 static SENSOR_DEVICE_ATTR(temp5_alarm, S_IRUGO, show_alarm, NULL, 3);
626 static SENSOR_DEVICE_ATTR(temp6_alarm, S_IRUGO, show_alarm, NULL, 8);
627 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 11);
628 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 0);
629 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 1);
630 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
631 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
632 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 2);
633 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
634 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
635 
636 static ssize_t show_name(struct device *dev, struct device_attribute
637                          *devattr, char *buf)
638 {
639         struct vt8231_data *data = dev_get_drvdata(dev);
640         return sprintf(buf, "%s\n", data->name);
641 }
642 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
643 
644 static struct attribute *vt8231_attributes_temps[6][5] = {
645         {
646                 &dev_attr_temp1_input.attr,
647                 &dev_attr_temp1_max_hyst.attr,
648                 &dev_attr_temp1_max.attr,
649                 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
650                 NULL
651         }, {
652                 &sensor_dev_attr_temp2_input.dev_attr.attr,
653                 &sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
654                 &sensor_dev_attr_temp2_max.dev_attr.attr,
655                 &sensor_dev_attr_temp2_alarm.dev_attr.attr,
656                 NULL
657         }, {
658                 &sensor_dev_attr_temp3_input.dev_attr.attr,
659                 &sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
660                 &sensor_dev_attr_temp3_max.dev_attr.attr,
661                 &sensor_dev_attr_temp3_alarm.dev_attr.attr,
662                 NULL
663         }, {
664                 &sensor_dev_attr_temp4_input.dev_attr.attr,
665                 &sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
666                 &sensor_dev_attr_temp4_max.dev_attr.attr,
667                 &sensor_dev_attr_temp4_alarm.dev_attr.attr,
668                 NULL
669         }, {
670                 &sensor_dev_attr_temp5_input.dev_attr.attr,
671                 &sensor_dev_attr_temp5_max_hyst.dev_attr.attr,
672                 &sensor_dev_attr_temp5_max.dev_attr.attr,
673                 &sensor_dev_attr_temp5_alarm.dev_attr.attr,
674                 NULL
675         }, {
676                 &sensor_dev_attr_temp6_input.dev_attr.attr,
677                 &sensor_dev_attr_temp6_max_hyst.dev_attr.attr,
678                 &sensor_dev_attr_temp6_max.dev_attr.attr,
679                 &sensor_dev_attr_temp6_alarm.dev_attr.attr,
680                 NULL
681         }
682 };
683 
684 static const struct attribute_group vt8231_group_temps[6] = {
685         { .attrs = vt8231_attributes_temps[0] },
686         { .attrs = vt8231_attributes_temps[1] },
687         { .attrs = vt8231_attributes_temps[2] },
688         { .attrs = vt8231_attributes_temps[3] },
689         { .attrs = vt8231_attributes_temps[4] },
690         { .attrs = vt8231_attributes_temps[5] },
691 };
692 
693 static struct attribute *vt8231_attributes_volts[6][5] = {
694         {
695                 &sensor_dev_attr_in0_input.dev_attr.attr,
696                 &sensor_dev_attr_in0_min.dev_attr.attr,
697                 &sensor_dev_attr_in0_max.dev_attr.attr,
698                 &sensor_dev_attr_in0_alarm.dev_attr.attr,
699                 NULL
700         }, {
701                 &sensor_dev_attr_in1_input.dev_attr.attr,
702                 &sensor_dev_attr_in1_min.dev_attr.attr,
703                 &sensor_dev_attr_in1_max.dev_attr.attr,
704                 &sensor_dev_attr_in1_alarm.dev_attr.attr,
705                 NULL
706         }, {
707                 &sensor_dev_attr_in2_input.dev_attr.attr,
708                 &sensor_dev_attr_in2_min.dev_attr.attr,
709                 &sensor_dev_attr_in2_max.dev_attr.attr,
710                 &sensor_dev_attr_in2_alarm.dev_attr.attr,
711                 NULL
712         }, {
713                 &sensor_dev_attr_in3_input.dev_attr.attr,
714                 &sensor_dev_attr_in3_min.dev_attr.attr,
715                 &sensor_dev_attr_in3_max.dev_attr.attr,
716                 &sensor_dev_attr_in3_alarm.dev_attr.attr,
717                 NULL
718         }, {
719                 &sensor_dev_attr_in4_input.dev_attr.attr,
720                 &sensor_dev_attr_in4_min.dev_attr.attr,
721                 &sensor_dev_attr_in4_max.dev_attr.attr,
722                 &sensor_dev_attr_in4_alarm.dev_attr.attr,
723                 NULL
724         }, {
725                 &dev_attr_in5_input.attr,
726                 &dev_attr_in5_min.attr,
727                 &dev_attr_in5_max.attr,
728                 &sensor_dev_attr_in5_alarm.dev_attr.attr,
729                 NULL
730         }
731 };
732 
733 static const struct attribute_group vt8231_group_volts[6] = {
734         { .attrs = vt8231_attributes_volts[0] },
735         { .attrs = vt8231_attributes_volts[1] },
736         { .attrs = vt8231_attributes_volts[2] },
737         { .attrs = vt8231_attributes_volts[3] },
738         { .attrs = vt8231_attributes_volts[4] },
739         { .attrs = vt8231_attributes_volts[5] },
740 };
741 
742 static struct attribute *vt8231_attributes[] = {
743         &sensor_dev_attr_fan1_input.dev_attr.attr,
744         &sensor_dev_attr_fan2_input.dev_attr.attr,
745         &sensor_dev_attr_fan1_min.dev_attr.attr,
746         &sensor_dev_attr_fan2_min.dev_attr.attr,
747         &sensor_dev_attr_fan1_div.dev_attr.attr,
748         &sensor_dev_attr_fan2_div.dev_attr.attr,
749         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
750         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
751         &dev_attr_alarms.attr,
752         &dev_attr_name.attr,
753         NULL
754 };
755 
756 static const struct attribute_group vt8231_group = {
757         .attrs = vt8231_attributes,
758 };
759 
760 static struct platform_driver vt8231_driver = {
761         .driver = {
762                 .owner  = THIS_MODULE,
763                 .name   = "vt8231",
764         },
765         .probe  = vt8231_probe,
766         .remove = vt8231_remove,
767 };
768 
769 static const struct pci_device_id vt8231_pci_ids[] = {
770         { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8231_4) },
771         { 0, }
772 };
773 
774 MODULE_DEVICE_TABLE(pci, vt8231_pci_ids);
775 
776 static int vt8231_pci_probe(struct pci_dev *dev,
777                                       const struct pci_device_id *id);
778 
779 static struct pci_driver vt8231_pci_driver = {
780         .name           = "vt8231",
781         .id_table       = vt8231_pci_ids,
782         .probe          = vt8231_pci_probe,
783 };
784 
785 static int vt8231_probe(struct platform_device *pdev)
786 {
787         struct resource *res;
788         struct vt8231_data *data;
789         int err = 0, i;
790 
791         /* Reserve the ISA region */
792         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
793         if (!devm_request_region(&pdev->dev, res->start, VT8231_EXTENT,
794                                  vt8231_driver.driver.name)) {
795                 dev_err(&pdev->dev, "Region 0x%lx-0x%lx already in use!\n",
796                         (unsigned long)res->start, (unsigned long)res->end);
797                 return -ENODEV;
798         }
799 
800         data = devm_kzalloc(&pdev->dev, sizeof(struct vt8231_data), GFP_KERNEL);
801         if (!data)
802                 return -ENOMEM;
803 
804         platform_set_drvdata(pdev, data);
805         data->addr = res->start;
806         data->name = "vt8231";
807 
808         mutex_init(&data->update_lock);
809         vt8231_init_device(data);
810 
811         /* Register sysfs hooks */
812         err = sysfs_create_group(&pdev->dev.kobj, &vt8231_group);
813         if (err)
814                 return err;
815 
816         /* Must update device information to find out the config field */
817         data->uch_config = vt8231_read_value(data, VT8231_REG_UCH_CONFIG);
818 
819         for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++) {
820                 if (ISTEMP(i, data->uch_config)) {
821                         err = sysfs_create_group(&pdev->dev.kobj,
822                                                  &vt8231_group_temps[i]);
823                         if (err)
824                                 goto exit_remove_files;
825                 }
826         }
827 
828         for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++) {
829                 if (ISVOLT(i, data->uch_config)) {
830                         err = sysfs_create_group(&pdev->dev.kobj,
831                                                  &vt8231_group_volts[i]);
832                         if (err)
833                                 goto exit_remove_files;
834                 }
835         }
836 
837         data->hwmon_dev = hwmon_device_register(&pdev->dev);
838         if (IS_ERR(data->hwmon_dev)) {
839                 err = PTR_ERR(data->hwmon_dev);
840                 goto exit_remove_files;
841         }
842         return 0;
843 
844 exit_remove_files:
845         for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++)
846                 sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_volts[i]);
847 
848         for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++)
849                 sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_temps[i]);
850 
851         sysfs_remove_group(&pdev->dev.kobj, &vt8231_group);
852         return err;
853 }
854 
855 static int vt8231_remove(struct platform_device *pdev)
856 {
857         struct vt8231_data *data = platform_get_drvdata(pdev);
858         int i;
859 
860         hwmon_device_unregister(data->hwmon_dev);
861 
862         for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++)
863                 sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_volts[i]);
864 
865         for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++)
866                 sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_temps[i]);
867 
868         sysfs_remove_group(&pdev->dev.kobj, &vt8231_group);
869 
870         return 0;
871 }
872 
873 static void vt8231_init_device(struct vt8231_data *data)
874 {
875         vt8231_write_value(data, VT8231_REG_TEMP1_CONFIG, 0);
876         vt8231_write_value(data, VT8231_REG_TEMP2_CONFIG, 0);
877 }
878 
879 static struct vt8231_data *vt8231_update_device(struct device *dev)
880 {
881         struct vt8231_data *data = dev_get_drvdata(dev);
882         int i;
883         u16 low;
884 
885         mutex_lock(&data->update_lock);
886 
887         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
888             || !data->valid) {
889                 for (i = 0; i < 6; i++) {
890                         if (ISVOLT(i, data->uch_config)) {
891                                 data->in[i] = vt8231_read_value(data,
892                                                 regvolt[i]);
893                                 data->in_min[i] = vt8231_read_value(data,
894                                                 regvoltmin[i]);
895                                 data->in_max[i] = vt8231_read_value(data,
896                                                 regvoltmax[i]);
897                         }
898                 }
899                 for (i = 0; i < 2; i++) {
900                         data->fan[i] = vt8231_read_value(data,
901                                                 VT8231_REG_FAN(i));
902                         data->fan_min[i] = vt8231_read_value(data,
903                                                 VT8231_REG_FAN_MIN(i));
904                 }
905 
906                 low = vt8231_read_value(data, VT8231_REG_TEMP_LOW01);
907                 low = (low >> 6) | ((low & 0x30) >> 2)
908                     | (vt8231_read_value(data, VT8231_REG_TEMP_LOW25) << 4);
909                 for (i = 0; i < 6; i++) {
910                         if (ISTEMP(i, data->uch_config)) {
911                                 data->temp[i] = (vt8231_read_value(data,
912                                                        regtemp[i]) << 2)
913                                                 | ((low >> (2 * i)) & 0x03);
914                                 data->temp_max[i] = vt8231_read_value(data,
915                                                       regtempmax[i]);
916                                 data->temp_min[i] = vt8231_read_value(data,
917                                                       regtempmin[i]);
918                         }
919                 }
920 
921                 i = vt8231_read_value(data, VT8231_REG_FANDIV);
922                 data->fan_div[0] = (i >> 4) & 0x03;
923                 data->fan_div[1] = i >> 6;
924                 data->alarms = vt8231_read_value(data, VT8231_REG_ALARM1) |
925                         (vt8231_read_value(data, VT8231_REG_ALARM2) << 8);
926 
927                 /* Set alarm flags correctly */
928                 if (!data->fan[0] && data->fan_min[0])
929                         data->alarms |= 0x40;
930                 else if (data->fan[0] && !data->fan_min[0])
931                         data->alarms &= ~0x40;
932 
933                 if (!data->fan[1] && data->fan_min[1])
934                         data->alarms |= 0x80;
935                 else if (data->fan[1] && !data->fan_min[1])
936                         data->alarms &= ~0x80;
937 
938                 data->last_updated = jiffies;
939                 data->valid = 1;
940         }
941 
942         mutex_unlock(&data->update_lock);
943 
944         return data;
945 }
946 
947 static int vt8231_device_add(unsigned short address)
948 {
949         struct resource res = {
950                 .start  = address,
951                 .end    = address + VT8231_EXTENT - 1,
952                 .name   = "vt8231",
953                 .flags  = IORESOURCE_IO,
954         };
955         int err;
956 
957         err = acpi_check_resource_conflict(&res);
958         if (err)
959                 goto exit;
960 
961         pdev = platform_device_alloc("vt8231", address);
962         if (!pdev) {
963                 err = -ENOMEM;
964                 pr_err("Device allocation failed\n");
965                 goto exit;
966         }
967 
968         err = platform_device_add_resources(pdev, &res, 1);
969         if (err) {
970                 pr_err("Device resource addition failed (%d)\n", err);
971                 goto exit_device_put;
972         }
973 
974         err = platform_device_add(pdev);
975         if (err) {
976                 pr_err("Device addition failed (%d)\n", err);
977                 goto exit_device_put;
978         }
979 
980         return 0;
981 
982 exit_device_put:
983         platform_device_put(pdev);
984 exit:
985         return err;
986 }
987 
988 static int vt8231_pci_probe(struct pci_dev *dev,
989                                 const struct pci_device_id *id)
990 {
991         u16 address, val;
992         if (force_addr) {
993                 address = force_addr & 0xff00;
994                 dev_warn(&dev->dev, "Forcing ISA address 0x%x\n",
995                          address);
996 
997                 if (PCIBIOS_SUCCESSFUL !=
998                     pci_write_config_word(dev, VT8231_BASE_REG, address | 1))
999                         return -ENODEV;
1000         }
1001 
1002         if (PCIBIOS_SUCCESSFUL != pci_read_config_word(dev, VT8231_BASE_REG,
1003                                                         &val))
1004                 return -ENODEV;
1005 
1006         address = val & ~(VT8231_EXTENT - 1);
1007         if (address == 0) {
1008                 dev_err(&dev->dev, "base address not set - upgrade BIOS or use force_addr=0xaddr\n");
1009                 return -ENODEV;
1010         }
1011 
1012         if (PCIBIOS_SUCCESSFUL != pci_read_config_word(dev, VT8231_ENABLE_REG,
1013                                                         &val))
1014                 return -ENODEV;
1015 
1016         if (!(val & 0x0001)) {
1017                 dev_warn(&dev->dev, "enabling sensors\n");
1018                 if (PCIBIOS_SUCCESSFUL !=
1019                         pci_write_config_word(dev, VT8231_ENABLE_REG,
1020                                                         val | 0x0001))
1021                         return -ENODEV;
1022         }
1023 
1024         if (platform_driver_register(&vt8231_driver))
1025                 goto exit;
1026 
1027         /* Sets global pdev as a side effect */
1028         if (vt8231_device_add(address))
1029                 goto exit_unregister;
1030 
1031         /*
1032          * Always return failure here.  This is to allow other drivers to bind
1033          * to this pci device.  We don't really want to have control over the
1034          * pci device, we only wanted to read as few register values from it.
1035          */
1036 
1037         /*
1038          * We do, however, mark ourselves as using the PCI device to stop it
1039          * getting unloaded.
1040          */
1041         s_bridge = pci_dev_get(dev);
1042         return -ENODEV;
1043 
1044 exit_unregister:
1045         platform_driver_unregister(&vt8231_driver);
1046 exit:
1047         return -ENODEV;
1048 }
1049 
1050 static int __init sm_vt8231_init(void)
1051 {
1052         return pci_register_driver(&vt8231_pci_driver);
1053 }
1054 
1055 static void __exit sm_vt8231_exit(void)
1056 {
1057         pci_unregister_driver(&vt8231_pci_driver);
1058         if (s_bridge != NULL) {
1059                 platform_device_unregister(pdev);
1060                 platform_driver_unregister(&vt8231_driver);
1061                 pci_dev_put(s_bridge);
1062                 s_bridge = NULL;
1063         }
1064 }
1065 
1066 MODULE_AUTHOR("Roger Lucas <vt8231@hiddenengine.co.uk>");
1067 MODULE_DESCRIPTION("VT8231 sensors");
1068 MODULE_LICENSE("GPL");
1069 
1070 module_init(sm_vt8231_init);
1071 module_exit(sm_vt8231_exit);
1072 

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