Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelv...
[linux-2.6.git] / drivers / hwmon / lm87.c
1 /*
2  * lm87.c
3  *
4  * Copyright (C) 2000       Frodo Looijaard <frodol@dds.nl>
5  *                          Philip Edelbrock <phil@netroedge.com>
6  *                          Stephen Rousset <stephen.rousset@rocketlogix.com>
7  *                          Dan Eaton <dan.eaton@rocketlogix.com>
8  * Copyright (C) 2004-2008  Jean Delvare <khali@linux-fr.org>
9  *
10  * Original port to Linux 2.6 by Jeff Oliver.
11  *
12  * The LM87 is a sensor chip made by National Semiconductor. It monitors up
13  * to 8 voltages (including its own power source), up to three temperatures
14  * (its own plus up to two external ones) and up to two fans. The default
15  * configuration is 6 voltages, two temperatures and two fans (see below).
16  * Voltages are scaled internally with ratios such that the nominal value of
17  * each voltage correspond to a register value of 192 (which means a
18  * resolution of about 0.5% of the nominal value). Temperature values are
19  * reported with a 1 deg resolution and a 3-4 deg accuracy. Complete
20  * datasheet can be obtained from National's website at:
21  *   http://www.national.com/pf/LM/LM87.html
22  *
23  * Some functions share pins, so not all functions are available at the same
24  * time. Which are depends on the hardware setup. This driver normally
25  * assumes that firmware configured the chip correctly. Where this is not
26  * the case, platform code must set the I2C client's platform_data to point
27  * to a u8 value to be written to the channel register.
28  * For reference, here is the list of exclusive functions:
29  *  - in0+in5 (default) or temp3
30  *  - fan1 (default) or in6
31  *  - fan2 (default) or in7
32  *  - VID lines (default) or IRQ lines (not handled by this driver)
33  *
34  * The LM87 additionally features an analog output, supposedly usable to
35  * control the speed of a fan. All new chips use pulse width modulation
36  * instead. The LM87 is the only hardware monitoring chipset I know of
37  * which uses amplitude modulation. Be careful when using this feature.
38  *
39  * This driver also supports the ADM1024, a sensor chip made by Analog
40  * Devices. That chip is fully compatible with the LM87. Complete
41  * datasheet can be obtained from Analog's website at:
42  *   http://www.analog.com/en/prod/0,2877,ADM1024,00.html
43  *
44  * This program is free software; you can redistribute it and/or modify
45  * it under the terms of the GNU General Public License as published by
46  * the Free Software Foundation; either version 2 of the License, or
47  * (at your option) any later version.
48  *
49  * This program is distributed in the hope that it will be useful,
50  * but WITHOUT ANY WARRANTY; without even the implied warranty of
51  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
52  * GNU General Public License for more details.
53  *
54  * You should have received a copy of the GNU General Public License
55  * along with this program; if not, write to the Free Software
56  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
57  */
58
59 #include <linux/module.h>
60 #include <linux/init.h>
61 #include <linux/slab.h>
62 #include <linux/jiffies.h>
63 #include <linux/i2c.h>
64 #include <linux/hwmon.h>
65 #include <linux/hwmon-sysfs.h>
66 #include <linux/hwmon-vid.h>
67 #include <linux/err.h>
68 #include <linux/mutex.h>
69
70 /*
71  * Addresses to scan
72  * LM87 has three possible addresses: 0x2c, 0x2d and 0x2e.
73  */
74
75 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
76
77 enum chips { lm87, adm1024 };
78
79 /*
80  * The LM87 registers
81  */
82
83 /* nr in 0..5 */
84 #define LM87_REG_IN(nr)                 (0x20 + (nr))
85 #define LM87_REG_IN_MAX(nr)             (0x2B + (nr) * 2)
86 #define LM87_REG_IN_MIN(nr)             (0x2C + (nr) * 2)
87 /* nr in 0..1 */
88 #define LM87_REG_AIN(nr)                (0x28 + (nr))
89 #define LM87_REG_AIN_MIN(nr)            (0x1A + (nr))
90 #define LM87_REG_AIN_MAX(nr)            (0x3B + (nr))
91
92 static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 };
93 static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B };
94 static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C };
95
96 #define LM87_REG_TEMP_HW_INT_LOCK       0x13
97 #define LM87_REG_TEMP_HW_EXT_LOCK       0x14
98 #define LM87_REG_TEMP_HW_INT            0x17
99 #define LM87_REG_TEMP_HW_EXT            0x18
100
101 /* nr in 0..1 */
102 #define LM87_REG_FAN(nr)                (0x28 + (nr))
103 #define LM87_REG_FAN_MIN(nr)            (0x3B + (nr))
104 #define LM87_REG_AOUT                   0x19
105
106 #define LM87_REG_CONFIG                 0x40
107 #define LM87_REG_CHANNEL_MODE           0x16
108 #define LM87_REG_VID_FAN_DIV            0x47
109 #define LM87_REG_VID4                   0x49
110
111 #define LM87_REG_ALARMS1                0x41
112 #define LM87_REG_ALARMS2                0x42
113
114 #define LM87_REG_COMPANY_ID             0x3E
115 #define LM87_REG_REVISION               0x3F
116
117 /*
118  * Conversions and various macros
119  * The LM87 uses signed 8-bit values for temperatures.
120  */
121
122 #define IN_FROM_REG(reg,scale)  (((reg) * (scale) + 96) / 192)
123 #define IN_TO_REG(val,scale)    ((val) <= 0 ? 0 : \
124                                  (val) * 192 >= (scale) * 255 ? 255 : \
125                                  ((val) * 192 + (scale)/2) / (scale))
126
127 #define TEMP_FROM_REG(reg)      ((reg) * 1000)
128 #define TEMP_TO_REG(val)        ((val) <= -127500 ? -128 : \
129                                  (val) >= 126500 ? 127 : \
130                                  (((val) < 0 ? (val)-500 : (val)+500) / 1000))
131
132 #define FAN_FROM_REG(reg,div)   ((reg) == 255 || (reg) == 0 ? 0 : \
133                                  (1350000 + (reg)*(div) / 2) / ((reg)*(div)))
134 #define FAN_TO_REG(val,div)     ((val)*(div) * 255 <= 1350000 ? 255 : \
135                                  (1350000 + (val)*(div) / 2) / ((val)*(div)))
136
137 #define FAN_DIV_FROM_REG(reg)   (1 << (reg))
138
139 /* analog out is 9.80mV/LSB */
140 #define AOUT_FROM_REG(reg)      (((reg) * 98 + 5) / 10)
141 #define AOUT_TO_REG(val)        ((val) <= 0 ? 0 : \
142                                  (val) >= 2500 ? 255 : \
143                                  ((val) * 10 + 49) / 98)
144
145 /* nr in 0..1 */
146 #define CHAN_NO_FAN(nr)         (1 << (nr))
147 #define CHAN_TEMP3              (1 << 2)
148 #define CHAN_VCC_5V             (1 << 3)
149 #define CHAN_NO_VID             (1 << 7)
150
151 /*
152  * Functions declaration
153  */
154
155 static int lm87_probe(struct i2c_client *client,
156                       const struct i2c_device_id *id);
157 static int lm87_detect(struct i2c_client *new_client,
158                        struct i2c_board_info *info);
159 static void lm87_init_client(struct i2c_client *client);
160 static int lm87_remove(struct i2c_client *client);
161 static struct lm87_data *lm87_update_device(struct device *dev);
162
163 /*
164  * Driver data (common to all clients)
165  */
166
167 static const struct i2c_device_id lm87_id[] = {
168         { "lm87", lm87 },
169         { "adm1024", adm1024 },
170         { }
171 };
172 MODULE_DEVICE_TABLE(i2c, lm87_id);
173
174 static struct i2c_driver lm87_driver = {
175         .class          = I2C_CLASS_HWMON,
176         .driver = {
177                 .name   = "lm87",
178         },
179         .probe          = lm87_probe,
180         .remove         = lm87_remove,
181         .id_table       = lm87_id,
182         .detect         = lm87_detect,
183         .address_list   = normal_i2c,
184 };
185
186 /*
187  * Client data (each client gets its own)
188  */
189
190 struct lm87_data {
191         struct device *hwmon_dev;
192         struct mutex update_lock;
193         char valid; /* zero until following fields are valid */
194         unsigned long last_updated; /* In jiffies */
195
196         u8 channel;             /* register value */
197         u8 config;              /* original register value */
198
199         u8 in[8];               /* register value */
200         u8 in_max[8];           /* register value */
201         u8 in_min[8];           /* register value */
202         u16 in_scale[8];
203
204         s8 temp[3];             /* register value */
205         s8 temp_high[3];        /* register value */
206         s8 temp_low[3];         /* register value */
207         s8 temp_crit_int;       /* min of two register values */
208         s8 temp_crit_ext;       /* min of two register values */
209
210         u8 fan[2];              /* register value */
211         u8 fan_min[2];          /* register value */
212         u8 fan_div[2];          /* register value, shifted right */
213         u8 aout;                /* register value */
214
215         u16 alarms;             /* register values, combined */
216         u8 vid;                 /* register values, combined */
217         u8 vrm;
218 };
219
220 /*
221  * Sysfs stuff
222  */
223
224 static inline int lm87_read_value(struct i2c_client *client, u8 reg)
225 {
226         return i2c_smbus_read_byte_data(client, reg);
227 }
228
229 static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value)
230 {
231         return i2c_smbus_write_byte_data(client, reg, value);
232 }
233
234 #define show_in(offset) \
235 static ssize_t show_in##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \
236 { \
237         struct lm87_data *data = lm87_update_device(dev); \
238         return sprintf(buf, "%u\n", IN_FROM_REG(data->in[offset], \
239                        data->in_scale[offset])); \
240 } \
241 static ssize_t show_in##offset##_min(struct device *dev, struct device_attribute *attr, char *buf) \
242 { \
243         struct lm87_data *data = lm87_update_device(dev); \
244         return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[offset], \
245                        data->in_scale[offset])); \
246 } \
247 static ssize_t show_in##offset##_max(struct device *dev, struct device_attribute *attr, char *buf) \
248 { \
249         struct lm87_data *data = lm87_update_device(dev); \
250         return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[offset], \
251                        data->in_scale[offset])); \
252 } \
253 static DEVICE_ATTR(in##offset##_input, S_IRUGO, \
254                 show_in##offset##_input, NULL);
255 show_in(0);
256 show_in(1);
257 show_in(2);
258 show_in(3);
259 show_in(4);
260 show_in(5);
261 show_in(6);
262 show_in(7);
263
264 static void set_in_min(struct device *dev, const char *buf, int nr)
265 {
266         struct i2c_client *client = to_i2c_client(dev);
267         struct lm87_data *data = i2c_get_clientdata(client);
268         long val = simple_strtol(buf, NULL, 10);
269
270         mutex_lock(&data->update_lock);
271         data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]);
272         lm87_write_value(client, nr<6 ? LM87_REG_IN_MIN(nr) :
273                          LM87_REG_AIN_MIN(nr-6), data->in_min[nr]);
274         mutex_unlock(&data->update_lock);
275 }
276
277 static void set_in_max(struct device *dev, const char *buf, int nr)
278 {
279         struct i2c_client *client = to_i2c_client(dev);
280         struct lm87_data *data = i2c_get_clientdata(client);
281         long val = simple_strtol(buf, NULL, 10);
282
283         mutex_lock(&data->update_lock);
284         data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]);
285         lm87_write_value(client, nr<6 ? LM87_REG_IN_MAX(nr) :
286                          LM87_REG_AIN_MAX(nr-6), data->in_max[nr]);
287         mutex_unlock(&data->update_lock);
288 }
289
290 #define set_in(offset) \
291 static ssize_t set_in##offset##_min(struct device *dev, struct device_attribute *attr, \
292                 const char *buf, size_t count) \
293 { \
294         set_in_min(dev, buf, offset); \
295         return count; \
296 } \
297 static ssize_t set_in##offset##_max(struct device *dev, struct device_attribute *attr, \
298                 const char *buf, size_t count) \
299 { \
300         set_in_max(dev, buf, offset); \
301         return count; \
302 } \
303 static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
304                 show_in##offset##_min, set_in##offset##_min); \
305 static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
306                 show_in##offset##_max, set_in##offset##_max);
307 set_in(0);
308 set_in(1);
309 set_in(2);
310 set_in(3);
311 set_in(4);
312 set_in(5);
313 set_in(6);
314 set_in(7);
315
316 #define show_temp(offset) \
317 static ssize_t show_temp##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \
318 { \
319         struct lm87_data *data = lm87_update_device(dev); \
320         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[offset-1])); \
321 } \
322 static ssize_t show_temp##offset##_low(struct device *dev, struct device_attribute *attr, char *buf) \
323 { \
324         struct lm87_data *data = lm87_update_device(dev); \
325         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_low[offset-1])); \
326 } \
327 static ssize_t show_temp##offset##_high(struct device *dev, struct device_attribute *attr, char *buf) \
328 { \
329         struct lm87_data *data = lm87_update_device(dev); \
330         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[offset-1])); \
331 }\
332 static DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
333                 show_temp##offset##_input, NULL);
334 show_temp(1);
335 show_temp(2);
336 show_temp(3);
337
338 static void set_temp_low(struct device *dev, const char *buf, int nr)
339 {
340         struct i2c_client *client = to_i2c_client(dev);
341         struct lm87_data *data = i2c_get_clientdata(client);
342         long val = simple_strtol(buf, NULL, 10);
343
344         mutex_lock(&data->update_lock);
345         data->temp_low[nr] = TEMP_TO_REG(val);
346         lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]);
347         mutex_unlock(&data->update_lock);
348 }
349
350 static void set_temp_high(struct device *dev, const char *buf, int nr)
351 {
352         struct i2c_client *client = to_i2c_client(dev);
353         struct lm87_data *data = i2c_get_clientdata(client);
354         long val = simple_strtol(buf, NULL, 10);
355
356         mutex_lock(&data->update_lock);
357         data->temp_high[nr] = TEMP_TO_REG(val);
358         lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]);
359         mutex_unlock(&data->update_lock);
360 }
361
362 #define set_temp(offset) \
363 static ssize_t set_temp##offset##_low(struct device *dev, struct device_attribute *attr, \
364                 const char *buf, size_t count) \
365 { \
366         set_temp_low(dev, buf, offset-1); \
367         return count; \
368 } \
369 static ssize_t set_temp##offset##_high(struct device *dev, struct device_attribute *attr, \
370                 const char *buf, size_t count) \
371 { \
372         set_temp_high(dev, buf, offset-1); \
373         return count; \
374 } \
375 static DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
376                 show_temp##offset##_high, set_temp##offset##_high); \
377 static DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \
378                 show_temp##offset##_low, set_temp##offset##_low);
379 set_temp(1);
380 set_temp(2);
381 set_temp(3);
382
383 static ssize_t show_temp_crit_int(struct device *dev, struct device_attribute *attr, char *buf)
384 {
385         struct lm87_data *data = lm87_update_device(dev);
386         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_int));
387 }
388
389 static ssize_t show_temp_crit_ext(struct device *dev, struct device_attribute *attr, char *buf)
390 {
391         struct lm87_data *data = lm87_update_device(dev);
392         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext));
393 }
394
395 static DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit_int, NULL);
396 static DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp_crit_ext, NULL);
397 static DEVICE_ATTR(temp3_crit, S_IRUGO, show_temp_crit_ext, NULL);
398
399 #define show_fan(offset) \
400 static ssize_t show_fan##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \
401 { \
402         struct lm87_data *data = lm87_update_device(dev); \
403         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[offset-1], \
404                        FAN_DIV_FROM_REG(data->fan_div[offset-1]))); \
405 } \
406 static ssize_t show_fan##offset##_min(struct device *dev, struct device_attribute *attr, char *buf) \
407 { \
408         struct lm87_data *data = lm87_update_device(dev); \
409         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[offset-1], \
410                        FAN_DIV_FROM_REG(data->fan_div[offset-1]))); \
411 } \
412 static ssize_t show_fan##offset##_div(struct device *dev, struct device_attribute *attr, char *buf) \
413 { \
414         struct lm87_data *data = lm87_update_device(dev); \
415         return sprintf(buf, "%d\n", FAN_DIV_FROM_REG(data->fan_div[offset-1])); \
416 } \
417 static DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
418                 show_fan##offset##_input, NULL);
419 show_fan(1);
420 show_fan(2);
421
422 static void set_fan_min(struct device *dev, const char *buf, int nr)
423 {
424         struct i2c_client *client = to_i2c_client(dev);
425         struct lm87_data *data = i2c_get_clientdata(client);
426         long val = simple_strtol(buf, NULL, 10);
427
428         mutex_lock(&data->update_lock);
429         data->fan_min[nr] = FAN_TO_REG(val,
430                             FAN_DIV_FROM_REG(data->fan_div[nr]));
431         lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]);
432         mutex_unlock(&data->update_lock);
433 }
434
435 /* Note: we save and restore the fan minimum here, because its value is
436    determined in part by the fan clock divider.  This follows the principle
437    of least surprise; the user doesn't expect the fan minimum to change just
438    because the divider changed. */
439 static ssize_t set_fan_div(struct device *dev, const char *buf,
440                 size_t count, int nr)
441 {
442         struct i2c_client *client = to_i2c_client(dev);
443         struct lm87_data *data = i2c_get_clientdata(client);
444         long val = simple_strtol(buf, NULL, 10);
445         unsigned long min;
446         u8 reg;
447
448         mutex_lock(&data->update_lock);
449         min = FAN_FROM_REG(data->fan_min[nr],
450                            FAN_DIV_FROM_REG(data->fan_div[nr]));
451
452         switch (val) {
453         case 1: data->fan_div[nr] = 0; break;
454         case 2: data->fan_div[nr] = 1; break;
455         case 4: data->fan_div[nr] = 2; break;
456         case 8: data->fan_div[nr] = 3; break;
457         default:
458                 mutex_unlock(&data->update_lock);
459                 return -EINVAL;
460         }
461
462         reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
463         switch (nr) {
464         case 0:
465             reg = (reg & 0xCF) | (data->fan_div[0] << 4);
466             break;
467         case 1:
468             reg = (reg & 0x3F) | (data->fan_div[1] << 6);
469             break;
470         }
471         lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg);
472
473         data->fan_min[nr] = FAN_TO_REG(min, val);
474         lm87_write_value(client, LM87_REG_FAN_MIN(nr),
475                          data->fan_min[nr]);
476         mutex_unlock(&data->update_lock);
477
478         return count;
479 }
480
481 #define set_fan(offset) \
482 static ssize_t set_fan##offset##_min(struct device *dev, struct device_attribute *attr, const char *buf, \
483                 size_t count) \
484 { \
485         set_fan_min(dev, buf, offset-1); \
486         return count; \
487 } \
488 static ssize_t set_fan##offset##_div(struct device *dev, struct device_attribute *attr, const char *buf, \
489                 size_t count) \
490 { \
491         return set_fan_div(dev, buf, count, offset-1); \
492 } \
493 static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
494                 show_fan##offset##_min, set_fan##offset##_min); \
495 static DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
496                 show_fan##offset##_div, set_fan##offset##_div);
497 set_fan(1);
498 set_fan(2);
499
500 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
501 {
502         struct lm87_data *data = lm87_update_device(dev);
503         return sprintf(buf, "%d\n", data->alarms);
504 }
505 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
506
507 static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf)
508 {
509         struct lm87_data *data = lm87_update_device(dev);
510         return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
511 }
512 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
513
514 static ssize_t show_vrm(struct device *dev, struct device_attribute *attr, char *buf)
515 {
516         struct lm87_data *data = dev_get_drvdata(dev);
517         return sprintf(buf, "%d\n", data->vrm);
518 }
519 static ssize_t set_vrm(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
520 {
521         struct lm87_data *data = dev_get_drvdata(dev);
522         data->vrm = simple_strtoul(buf, NULL, 10);
523         return count;
524 }
525 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
526
527 static ssize_t show_aout(struct device *dev, struct device_attribute *attr, char *buf)
528 {
529         struct lm87_data *data = lm87_update_device(dev);
530         return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
531 }
532 static ssize_t set_aout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
533 {
534         struct i2c_client *client = to_i2c_client(dev);
535         struct lm87_data *data = i2c_get_clientdata(client);
536         long val = simple_strtol(buf, NULL, 10);
537
538         mutex_lock(&data->update_lock);
539         data->aout = AOUT_TO_REG(val);
540         lm87_write_value(client, LM87_REG_AOUT, data->aout);
541         mutex_unlock(&data->update_lock);
542         return count;
543 }
544 static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout);
545
546 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
547                           char *buf)
548 {
549         struct lm87_data *data = lm87_update_device(dev);
550         int bitnr = to_sensor_dev_attr(attr)->index;
551         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
552 }
553 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
554 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
555 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
556 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
557 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
558 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
559 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6);
560 static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 7);
561 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
562 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5);
563 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 5);
564 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
565 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
566 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 14);
567 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 15);
568
569 /*
570  * Real code
571  */
572
573 static struct attribute *lm87_attributes[] = {
574         &dev_attr_in1_input.attr,
575         &dev_attr_in1_min.attr,
576         &dev_attr_in1_max.attr,
577         &sensor_dev_attr_in1_alarm.dev_attr.attr,
578         &dev_attr_in2_input.attr,
579         &dev_attr_in2_min.attr,
580         &dev_attr_in2_max.attr,
581         &sensor_dev_attr_in2_alarm.dev_attr.attr,
582         &dev_attr_in3_input.attr,
583         &dev_attr_in3_min.attr,
584         &dev_attr_in3_max.attr,
585         &sensor_dev_attr_in3_alarm.dev_attr.attr,
586         &dev_attr_in4_input.attr,
587         &dev_attr_in4_min.attr,
588         &dev_attr_in4_max.attr,
589         &sensor_dev_attr_in4_alarm.dev_attr.attr,
590
591         &dev_attr_temp1_input.attr,
592         &dev_attr_temp1_max.attr,
593         &dev_attr_temp1_min.attr,
594         &dev_attr_temp1_crit.attr,
595         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
596         &dev_attr_temp2_input.attr,
597         &dev_attr_temp2_max.attr,
598         &dev_attr_temp2_min.attr,
599         &dev_attr_temp2_crit.attr,
600         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
601         &sensor_dev_attr_temp2_fault.dev_attr.attr,
602
603         &dev_attr_alarms.attr,
604         &dev_attr_aout_output.attr,
605
606         NULL
607 };
608
609 static const struct attribute_group lm87_group = {
610         .attrs = lm87_attributes,
611 };
612
613 static struct attribute *lm87_attributes_opt[] = {
614         &dev_attr_in6_input.attr,
615         &dev_attr_in6_min.attr,
616         &dev_attr_in6_max.attr,
617         &sensor_dev_attr_in6_alarm.dev_attr.attr,
618
619         &dev_attr_fan1_input.attr,
620         &dev_attr_fan1_min.attr,
621         &dev_attr_fan1_div.attr,
622         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
623
624         &dev_attr_in7_input.attr,
625         &dev_attr_in7_min.attr,
626         &dev_attr_in7_max.attr,
627         &sensor_dev_attr_in7_alarm.dev_attr.attr,
628
629         &dev_attr_fan2_input.attr,
630         &dev_attr_fan2_min.attr,
631         &dev_attr_fan2_div.attr,
632         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
633
634         &dev_attr_temp3_input.attr,
635         &dev_attr_temp3_max.attr,
636         &dev_attr_temp3_min.attr,
637         &dev_attr_temp3_crit.attr,
638         &sensor_dev_attr_temp3_alarm.dev_attr.attr,
639         &sensor_dev_attr_temp3_fault.dev_attr.attr,
640
641         &dev_attr_in0_input.attr,
642         &dev_attr_in0_min.attr,
643         &dev_attr_in0_max.attr,
644         &sensor_dev_attr_in0_alarm.dev_attr.attr,
645         &dev_attr_in5_input.attr,
646         &dev_attr_in5_min.attr,
647         &dev_attr_in5_max.attr,
648         &sensor_dev_attr_in5_alarm.dev_attr.attr,
649
650         &dev_attr_cpu0_vid.attr,
651         &dev_attr_vrm.attr,
652
653         NULL
654 };
655
656 static const struct attribute_group lm87_group_opt = {
657         .attrs = lm87_attributes_opt,
658 };
659
660 /* Return 0 if detection is successful, -ENODEV otherwise */
661 static int lm87_detect(struct i2c_client *new_client,
662                        struct i2c_board_info *info)
663 {
664         struct i2c_adapter *adapter = new_client->adapter;
665         const char *name;
666         u8 cid, rev;
667
668         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
669                 return -ENODEV;
670
671         if (lm87_read_value(new_client, LM87_REG_CONFIG) & 0x80)
672                 return -ENODEV;
673
674         /* Now, we do the remaining detection. */
675         cid = lm87_read_value(new_client, LM87_REG_COMPANY_ID);
676         rev = lm87_read_value(new_client, LM87_REG_REVISION);
677
678         if (cid == 0x02                 /* National Semiconductor */
679          && (rev >= 0x01 && rev <= 0x08))
680                 name = "lm87";
681         else if (cid == 0x41            /* Analog Devices */
682               && (rev & 0xf0) == 0x10)
683                 name = "adm1024";
684         else {
685                 dev_dbg(&adapter->dev, "LM87 detection failed at 0x%02x\n",
686                         new_client->addr);
687                 return -ENODEV;
688         }
689
690         strlcpy(info->type, name, I2C_NAME_SIZE);
691
692         return 0;
693 }
694
695 static int lm87_probe(struct i2c_client *new_client,
696                       const struct i2c_device_id *id)
697 {
698         struct lm87_data *data;
699         int err;
700
701         data = kzalloc(sizeof(struct lm87_data), GFP_KERNEL);
702         if (!data) {
703                 err = -ENOMEM;
704                 goto exit;
705         }
706
707         i2c_set_clientdata(new_client, data);
708         data->valid = 0;
709         mutex_init(&data->update_lock);
710
711         /* Initialize the LM87 chip */
712         lm87_init_client(new_client);
713
714         data->in_scale[0] = 2500;
715         data->in_scale[1] = 2700;
716         data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300;
717         data->in_scale[3] = 5000;
718         data->in_scale[4] = 12000;
719         data->in_scale[5] = 2700;
720         data->in_scale[6] = 1875;
721         data->in_scale[7] = 1875;
722
723         /* Register sysfs hooks */
724         if ((err = sysfs_create_group(&new_client->dev.kobj, &lm87_group)))
725                 goto exit_free;
726
727         if (data->channel & CHAN_NO_FAN(0)) {
728                 if ((err = device_create_file(&new_client->dev,
729                                         &dev_attr_in6_input))
730                  || (err = device_create_file(&new_client->dev,
731                                         &dev_attr_in6_min))
732                  || (err = device_create_file(&new_client->dev,
733                                         &dev_attr_in6_max))
734                  || (err = device_create_file(&new_client->dev,
735                                         &sensor_dev_attr_in6_alarm.dev_attr)))
736                         goto exit_remove;
737         } else {
738                 if ((err = device_create_file(&new_client->dev,
739                                         &dev_attr_fan1_input))
740                  || (err = device_create_file(&new_client->dev,
741                                         &dev_attr_fan1_min))
742                  || (err = device_create_file(&new_client->dev,
743                                         &dev_attr_fan1_div))
744                  || (err = device_create_file(&new_client->dev,
745                                         &sensor_dev_attr_fan1_alarm.dev_attr)))
746                         goto exit_remove;
747         }
748
749         if (data->channel & CHAN_NO_FAN(1)) {
750                 if ((err = device_create_file(&new_client->dev,
751                                         &dev_attr_in7_input))
752                  || (err = device_create_file(&new_client->dev,
753                                         &dev_attr_in7_min))
754                  || (err = device_create_file(&new_client->dev,
755                                         &dev_attr_in7_max))
756                  || (err = device_create_file(&new_client->dev,
757                                         &sensor_dev_attr_in7_alarm.dev_attr)))
758                         goto exit_remove;
759         } else {
760                 if ((err = device_create_file(&new_client->dev,
761                                         &dev_attr_fan2_input))
762                  || (err = device_create_file(&new_client->dev,
763                                         &dev_attr_fan2_min))
764                  || (err = device_create_file(&new_client->dev,
765                                         &dev_attr_fan2_div))
766                  || (err = device_create_file(&new_client->dev,
767                                         &sensor_dev_attr_fan2_alarm.dev_attr)))
768                         goto exit_remove;
769         }
770
771         if (data->channel & CHAN_TEMP3) {
772                 if ((err = device_create_file(&new_client->dev,
773                                         &dev_attr_temp3_input))
774                  || (err = device_create_file(&new_client->dev,
775                                         &dev_attr_temp3_max))
776                  || (err = device_create_file(&new_client->dev,
777                                         &dev_attr_temp3_min))
778                  || (err = device_create_file(&new_client->dev,
779                                         &dev_attr_temp3_crit))
780                  || (err = device_create_file(&new_client->dev,
781                                         &sensor_dev_attr_temp3_alarm.dev_attr))
782                  || (err = device_create_file(&new_client->dev,
783                                         &sensor_dev_attr_temp3_fault.dev_attr)))
784                         goto exit_remove;
785         } else {
786                 if ((err = device_create_file(&new_client->dev,
787                                         &dev_attr_in0_input))
788                  || (err = device_create_file(&new_client->dev,
789                                         &dev_attr_in0_min))
790                  || (err = device_create_file(&new_client->dev,
791                                         &dev_attr_in0_max))
792                  || (err = device_create_file(&new_client->dev,
793                                         &sensor_dev_attr_in0_alarm.dev_attr))
794                  || (err = device_create_file(&new_client->dev,
795                                         &dev_attr_in5_input))
796                  || (err = device_create_file(&new_client->dev,
797                                         &dev_attr_in5_min))
798                  || (err = device_create_file(&new_client->dev,
799                                         &dev_attr_in5_max))
800                  || (err = device_create_file(&new_client->dev,
801                                         &sensor_dev_attr_in5_alarm.dev_attr)))
802                         goto exit_remove;
803         }
804
805         if (!(data->channel & CHAN_NO_VID)) {
806                 data->vrm = vid_which_vrm();
807                 if ((err = device_create_file(&new_client->dev,
808                                         &dev_attr_cpu0_vid))
809                  || (err = device_create_file(&new_client->dev,
810                                         &dev_attr_vrm)))
811                         goto exit_remove;
812         }
813
814         data->hwmon_dev = hwmon_device_register(&new_client->dev);
815         if (IS_ERR(data->hwmon_dev)) {
816                 err = PTR_ERR(data->hwmon_dev);
817                 goto exit_remove;
818         }
819
820         return 0;
821
822 exit_remove:
823         sysfs_remove_group(&new_client->dev.kobj, &lm87_group);
824         sysfs_remove_group(&new_client->dev.kobj, &lm87_group_opt);
825 exit_free:
826         lm87_write_value(new_client, LM87_REG_CONFIG, data->config);
827         kfree(data);
828 exit:
829         return err;
830 }
831
832 static void lm87_init_client(struct i2c_client *client)
833 {
834         struct lm87_data *data = i2c_get_clientdata(client);
835
836         if (client->dev.platform_data) {
837                 data->channel = *(u8 *)client->dev.platform_data;
838                 lm87_write_value(client,
839                                  LM87_REG_CHANNEL_MODE, data->channel);
840         } else {
841                 data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE);
842         }
843         data->config = lm87_read_value(client, LM87_REG_CONFIG) & 0x6F;
844
845         if (!(data->config & 0x01)) {
846                 int i;
847
848                 /* Limits are left uninitialized after power-up */
849                 for (i = 1; i < 6; i++) {
850                         lm87_write_value(client, LM87_REG_IN_MIN(i), 0x00);
851                         lm87_write_value(client, LM87_REG_IN_MAX(i), 0xFF);
852                 }
853                 for (i = 0; i < 2; i++) {
854                         lm87_write_value(client, LM87_REG_TEMP_HIGH[i], 0x7F);
855                         lm87_write_value(client, LM87_REG_TEMP_LOW[i], 0x00);
856                         lm87_write_value(client, LM87_REG_AIN_MIN(i), 0x00);
857                         lm87_write_value(client, LM87_REG_AIN_MAX(i), 0xFF);
858                 }
859                 if (data->channel & CHAN_TEMP3) {
860                         lm87_write_value(client, LM87_REG_TEMP_HIGH[2], 0x7F);
861                         lm87_write_value(client, LM87_REG_TEMP_LOW[2], 0x00);
862                 } else {
863                         lm87_write_value(client, LM87_REG_IN_MIN(0), 0x00);
864                         lm87_write_value(client, LM87_REG_IN_MAX(0), 0xFF);
865                 }
866         }
867
868         /* Make sure Start is set and INT#_Clear is clear */
869         if ((data->config & 0x09) != 0x01)
870                 lm87_write_value(client, LM87_REG_CONFIG,
871                                  (data->config & 0x77) | 0x01);
872 }
873
874 static int lm87_remove(struct i2c_client *client)
875 {
876         struct lm87_data *data = i2c_get_clientdata(client);
877
878         hwmon_device_unregister(data->hwmon_dev);
879         sysfs_remove_group(&client->dev.kobj, &lm87_group);
880         sysfs_remove_group(&client->dev.kobj, &lm87_group_opt);
881
882         lm87_write_value(client, LM87_REG_CONFIG, data->config);
883         kfree(data);
884         return 0;
885 }
886
887 static struct lm87_data *lm87_update_device(struct device *dev)
888 {
889         struct i2c_client *client = to_i2c_client(dev);
890         struct lm87_data *data = i2c_get_clientdata(client);
891
892         mutex_lock(&data->update_lock);
893
894         if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
895                 int i, j;
896
897                 dev_dbg(&client->dev, "Updating data.\n");
898
899                 i = (data->channel & CHAN_TEMP3) ? 1 : 0;
900                 j = (data->channel & CHAN_TEMP3) ? 5 : 6;
901                 for (; i < j; i++) {
902                         data->in[i] = lm87_read_value(client,
903                                       LM87_REG_IN(i));
904                         data->in_min[i] = lm87_read_value(client,
905                                           LM87_REG_IN_MIN(i));
906                         data->in_max[i] = lm87_read_value(client,
907                                           LM87_REG_IN_MAX(i));
908                 }
909
910                 for (i = 0; i < 2; i++) {
911                         if (data->channel & CHAN_NO_FAN(i)) {
912                                 data->in[6+i] = lm87_read_value(client,
913                                                 LM87_REG_AIN(i));
914                                 data->in_max[6+i] = lm87_read_value(client,
915                                                     LM87_REG_AIN_MAX(i));
916                                 data->in_min[6+i] = lm87_read_value(client,
917                                                     LM87_REG_AIN_MIN(i));
918
919                         } else {
920                                 data->fan[i] = lm87_read_value(client,
921                                                LM87_REG_FAN(i));
922                                 data->fan_min[i] = lm87_read_value(client,
923                                                    LM87_REG_FAN_MIN(i));
924                         }
925                 }
926
927                 j = (data->channel & CHAN_TEMP3) ? 3 : 2;
928                 for (i = 0 ; i < j; i++) {
929                         data->temp[i] = lm87_read_value(client,
930                                         LM87_REG_TEMP[i]);
931                         data->temp_high[i] = lm87_read_value(client,
932                                              LM87_REG_TEMP_HIGH[i]);
933                         data->temp_low[i] = lm87_read_value(client,
934                                             LM87_REG_TEMP_LOW[i]);
935                 }
936
937                 i = lm87_read_value(client, LM87_REG_TEMP_HW_INT_LOCK);
938                 j = lm87_read_value(client, LM87_REG_TEMP_HW_INT);
939                 data->temp_crit_int = min(i, j);
940
941                 i = lm87_read_value(client, LM87_REG_TEMP_HW_EXT_LOCK);
942                 j = lm87_read_value(client, LM87_REG_TEMP_HW_EXT);
943                 data->temp_crit_ext = min(i, j);
944
945                 i = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
946                 data->fan_div[0] = (i >> 4) & 0x03;
947                 data->fan_div[1] = (i >> 6) & 0x03;
948                 data->vid = (i & 0x0F)
949                           | (lm87_read_value(client, LM87_REG_VID4) & 0x01)
950                              << 4;
951
952                 data->alarms = lm87_read_value(client, LM87_REG_ALARMS1)
953                              | (lm87_read_value(client, LM87_REG_ALARMS2)
954                                 << 8);
955                 data->aout = lm87_read_value(client, LM87_REG_AOUT);
956
957                 data->last_updated = jiffies;
958                 data->valid = 1;
959         }
960
961         mutex_unlock(&data->update_lock);
962
963         return data;
964 }
965
966 static int __init sensors_lm87_init(void)
967 {
968         return i2c_add_driver(&lm87_driver);
969 }
970
971 static void __exit sensors_lm87_exit(void)
972 {
973         i2c_del_driver(&lm87_driver);
974 }
975
976 MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org> and others");
977 MODULE_DESCRIPTION("LM87 driver");
978 MODULE_LICENSE("GPL");
979
980 module_init(sensors_lm87_init);
981 module_exit(sensors_lm87_exit);