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Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
[linux.git] / drivers / hwmon / lm80.c
CommitLineData
1da177e4
LT		 1/*
2 * lm80.c - From lm_sensors, Linux kernel modules for hardware
3 * monitoring
4 * Copyright (C) 1998, 1999 Frodo Looijaard <[email protected]>
5 * and Philip Edelbrock <[email protected]>
6 *
7 * Ported to Linux 2.6 by Tiago Sousa <[email protected]>
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
1da177e4
LT		 24#include <linux/module.h>
25#include <linux/init.h>
26#include <linux/slab.h>
27#include <linux/jiffies.h>
28#include <linux/i2c.h>
943b0830 29#include <linux/hwmon.h>
f8181762 30#include <linux/hwmon-sysfs.h>
943b0830 31#include <linux/err.h>
9a61bf63 32#include <linux/mutex.h>
1da177e4
LT		 33
34/* Addresses to scan */
25e9c86d
MH		 35static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
36 0x2e, 0x2f, I2C_CLIENT_END };
1da177e4 37
1da177e4
LT		 38/* Many LM80 constants specified below */
39
40/* The LM80 registers */
41#define LM80_REG_IN_MAX(nr) (0x2a + (nr) * 2)
42#define LM80_REG_IN_MIN(nr) (0x2b + (nr) * 2)
43#define LM80_REG_IN(nr) (0x20 + (nr))
44
45#define LM80_REG_FAN1 0x28
46#define LM80_REG_FAN2 0x29
47#define LM80_REG_FAN_MIN(nr) (0x3b + (nr))
48
49#define LM80_REG_TEMP 0x27
50#define LM80_REG_TEMP_HOT_MAX 0x38
51#define LM80_REG_TEMP_HOT_HYST 0x39
52#define LM80_REG_TEMP_OS_MAX 0x3a
53#define LM80_REG_TEMP_OS_HYST 0x3b
54
55#define LM80_REG_CONFIG 0x00
56#define LM80_REG_ALARM1 0x01
57#define LM80_REG_ALARM2 0x02
58#define LM80_REG_MASK1 0x03
59#define LM80_REG_MASK2 0x04
60#define LM80_REG_FANDIV 0x05
61#define LM80_REG_RES 0x06
62
63
64/* Conversions. Rounding and limit checking is only done on the TO_REG
65 variants. Note that you should be a bit careful with which arguments
66 these macros are called: arguments may be evaluated more than once.
67 Fixing this is just not worth it. */
68
69#define IN_TO_REG(val) (SENSORS_LIMIT(((val)+5)/10,0,255))
70#define IN_FROM_REG(val) ((val)*10)
71
72static inline unsigned char FAN_TO_REG(unsigned rpm, unsigned div)
73{
74 if (rpm == 0)
75 return 255;
76 rpm = SENSORS_LIMIT(rpm, 1, 1000000);
77 return SENSORS_LIMIT((1350000 + rpm*div / 2) / (rpm*div), 1, 254);
78}
79
80#define FAN_FROM_REG(val,div) ((val)==0?-1:\
81 (val)==255?0:1350000/((div)*(val)))
82
83static inline long TEMP_FROM_REG(u16 temp)
84{
85 long res;
86
87 temp >>= 4;
88 if (temp < 0x0800)
89 res = 625 * (long) temp;
90 else
91 res = ((long) temp - 0x01000) * 625;
92
93 return res / 10;
94}
95
96#define TEMP_LIMIT_FROM_REG(val) (((val)>0x80?(val)-0x100:(val))*1000)
97
98#define TEMP_LIMIT_TO_REG(val) SENSORS_LIMIT((val)<0?\
99 ((val)-500)/1000:((val)+500)/1000,0,255)
100
101#define DIV_FROM_REG(val) (1 << (val))
102
103/*
104 * Client data (each client gets its own)
105 */
106
107struct lm80_data {
1beeffe4 108 struct device *hwmon_dev;
9a61bf63 109 struct mutex update_lock;
1da177e4
LT		 110 char valid; /* !=0 if following fields are valid */
111 unsigned long last_updated; /* In jiffies */
112
113 u8 in[7]; /* Register value */
114 u8 in_max[7]; /* Register value */
115 u8 in_min[7]; /* Register value */
116 u8 fan[2]; /* Register value */
117 u8 fan_min[2]; /* Register value */
118 u8 fan_div[2]; /* Register encoding, shifted right */
119 u16 temp; /* Register values, shifted right */
120 u8 temp_hot_max; /* Register value */
121 u8 temp_hot_hyst; /* Register value */
122 u8 temp_os_max; /* Register value */
123 u8 temp_os_hyst; /* Register value */
124 u16 alarms; /* Register encoding, combined */
125};
126
6cc37ee5 127/*
1da177e4
LT		 128 * Functions declaration
129 */
130
8c8bacc8
JD		 131static int lm80_probe(struct i2c_client *client,
132 const struct i2c_device_id *id);
310ec792 133static int lm80_detect(struct i2c_client *client, struct i2c_board_info *info);
1da177e4 134static void lm80_init_client(struct i2c_client *client);
8c8bacc8 135static int lm80_remove(struct i2c_client *client);
1da177e4
LT		 136static struct lm80_data *lm80_update_device(struct device *dev);
137static int lm80_read_value(struct i2c_client *client, u8 reg);
138static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value);
139
140/*
141 * Driver data (common to all clients)
142 */
143
8c8bacc8 144static const struct i2c_device_id lm80_id[] = {
1f86df49 145 { "lm80", 0 },
8c8bacc8
JD		 146 { }
147};
148MODULE_DEVICE_TABLE(i2c, lm80_id);
149
1da177e4 150static struct i2c_driver lm80_driver = {
8c8bacc8 151 .class = I2C_CLASS_HWMON,
cdaf7934 152 .driver = {
cdaf7934
LR		 153 .name = "lm80",
154 },
8c8bacc8
JD		 155 .probe = lm80_probe,
156 .remove = lm80_remove,
157 .id_table = lm80_id,
158 .detect = lm80_detect,
c3813d6a 159 .address_list = normal_i2c,
1da177e4
LT		 160};
161
162/*
163 * Sysfs stuff
164 */
165
166#define show_in(suffix, value) \
8627f9ba 167static ssize_t show_in_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
1da177e4 168{ \
f8181762 169 int nr = to_sensor_dev_attr(attr)->index; \
1da177e4 170 struct lm80_data *data = lm80_update_device(dev); \
f8181762 171 return sprintf(buf, "%d\n", IN_FROM_REG(data->value[nr])); \
1da177e4 172}
f8181762
JD		 173show_in(min, in_min)
174show_in(max, in_max)
175show_in(input, in)
1da177e4
LT		 176
177#define set_in(suffix, value, reg) \
8627f9ba 178static ssize_t set_in_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
1da177e4
LT		 179 size_t count) \
180{ \
f8181762 181 int nr = to_sensor_dev_attr(attr)->index; \
1da177e4
LT		 182 struct i2c_client *client = to_i2c_client(dev); \
183 struct lm80_data *data = i2c_get_clientdata(client); \
184 long val = simple_strtol(buf, NULL, 10); \
185 \
9a61bf63 186 mutex_lock(&data->update_lock);\
f8181762
JD		 187 data->value[nr] = IN_TO_REG(val); \
188 lm80_write_value(client, reg(nr), data->value[nr]); \
9a61bf63 189 mutex_unlock(&data->update_lock);\
1da177e4
LT		 190 return count; \
191}
f8181762
JD		 192set_in(min, in_min, LM80_REG_IN_MIN)
193set_in(max, in_max, LM80_REG_IN_MAX)
194
195#define show_fan(suffix, value) \
8627f9ba 196static ssize_t show_fan_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
1da177e4 197{ \
f8181762 198 int nr = to_sensor_dev_attr(attr)->index; \
1da177e4 199 struct lm80_data *data = lm80_update_device(dev); \
f8181762
JD		 200 return sprintf(buf, "%d\n", FAN_FROM_REG(data->value[nr], \
201 DIV_FROM_REG(data->fan_div[nr]))); \
1da177e4 202}
f8181762
JD		 203show_fan(min, fan_min)
204show_fan(input, fan)
1da177e4 205
f8181762
JD		 206static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
207 char *buf)
208{
209 int nr = to_sensor_dev_attr(attr)->index;
210 struct lm80_data *data = lm80_update_device(dev);
211 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
1da177e4 212}
1da177e4 213
f8181762
JD		 214static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
215 const char *buf, size_t count)
216{
217 int nr = to_sensor_dev_attr(attr)->index;
218 struct i2c_client *client = to_i2c_client(dev);
219 struct lm80_data *data = i2c_get_clientdata(client);
220 long val = simple_strtoul(buf, NULL, 10);
221
222 mutex_lock(&data->update_lock);
223 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
224 lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]);
225 mutex_unlock(&data->update_lock);
226 return count;
1da177e4 227}
1da177e4
LT		 228
229/* Note: we save and restore the fan minimum here, because its value is
230 determined in part by the fan divisor. This follows the principle of
d6e05edc 231 least surprise; the user doesn't expect the fan minimum to change just
1da177e4 232 because the divisor changed. */
f8181762
JD		 233static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
234 const char *buf, size_t count)
1da177e4 235{
f8181762 236 int nr = to_sensor_dev_attr(attr)->index;
1da177e4
LT		 237 struct i2c_client *client = to_i2c_client(dev);
238 struct lm80_data *data = i2c_get_clientdata(client);
239 unsigned long min, val = simple_strtoul(buf, NULL, 10);
240 u8 reg;
241
242 /* Save fan_min */
9a61bf63 243 mutex_lock(&data->update_lock);
1da177e4
LT		 244 min = FAN_FROM_REG(data->fan_min[nr],
245 DIV_FROM_REG(data->fan_div[nr]));
246
247 switch (val) {
248 case 1: data->fan_div[nr] = 0; break;
249 case 2: data->fan_div[nr] = 1; break;
250 case 4: data->fan_div[nr] = 2; break;
251 case 8: data->fan_div[nr] = 3; break;
252 default:
253 dev_err(&client->dev, "fan_div value %ld not "
254 "supported. Choose one of 1, 2, 4 or 8!\n", val);
9a61bf63 255 mutex_unlock(&data->update_lock);
1da177e4
LT		 256 return -EINVAL;
257 }
258
259 reg = (lm80_read_value(client, LM80_REG_FANDIV) & ~(3 << (2 * (nr + 1))))
260 | (data->fan_div[nr] << (2 * (nr + 1)));
261 lm80_write_value(client, LM80_REG_FANDIV, reg);
262
263 /* Restore fan_min */
264 data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
265 lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]);
9a61bf63 266 mutex_unlock(&data->update_lock);
1da177e4
LT		 267
268 return count;
269}
270
8627f9ba 271static ssize_t show_temp_input1(struct device *dev, struct device_attribute *attr, char *buf)
1da177e4
LT		 272{
273 struct lm80_data *data = lm80_update_device(dev);
274 return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp));
275}
276
277#define show_temp(suffix, value) \
8627f9ba 278static ssize_t show_temp_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
1da177e4
LT		 279{ \
280 struct lm80_data *data = lm80_update_device(dev); \
281 return sprintf(buf, "%d\n", TEMP_LIMIT_FROM_REG(data->value)); \
282}
283show_temp(hot_max, temp_hot_max);
284show_temp(hot_hyst, temp_hot_hyst);
285show_temp(os_max, temp_os_max);
286show_temp(os_hyst, temp_os_hyst);
287
288#define set_temp(suffix, value, reg) \
8627f9ba 289static ssize_t set_temp_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
1da177e4
LT		 290 size_t count) \
291{ \
292 struct i2c_client *client = to_i2c_client(dev); \
293 struct lm80_data *data = i2c_get_clientdata(client); \
294 long val = simple_strtoul(buf, NULL, 10); \
295 \
9a61bf63 296 mutex_lock(&data->update_lock); \
1da177e4
LT		 297 data->value = TEMP_LIMIT_TO_REG(val); \
298 lm80_write_value(client, reg, data->value); \
9a61bf63 299 mutex_unlock(&data->update_lock); \
1da177e4
LT		 300 return count; \
301}
302set_temp(hot_max, temp_hot_max, LM80_REG_TEMP_HOT_MAX);
303set_temp(hot_hyst, temp_hot_hyst, LM80_REG_TEMP_HOT_HYST);
304set_temp(os_max, temp_os_max, LM80_REG_TEMP_OS_MAX);
305set_temp(os_hyst, temp_os_hyst, LM80_REG_TEMP_OS_HYST);
306
6cc37ee5
JD		 307static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
308 char *buf)
1da177e4
LT		 309{
310 struct lm80_data *data = lm80_update_device(dev);
311 return sprintf(buf, "%u\n", data->alarms);
312}
313
e84542f5
JD		 314static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
315 char *buf)
316{
317 int bitnr = to_sensor_dev_attr(attr)->index;
318 struct lm80_data *data = lm80_update_device(dev);
319 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
320}
321
f8181762
JD		 322static SENSOR_DEVICE_ATTR(in0_min, S_IWUSR | S_IRUGO,
323 show_in_min, set_in_min, 0);
324static SENSOR_DEVICE_ATTR(in1_min, S_IWUSR | S_IRUGO,
325 show_in_min, set_in_min, 1);
326static SENSOR_DEVICE_ATTR(in2_min, S_IWUSR | S_IRUGO,
327 show_in_min, set_in_min, 2);
328static SENSOR_DEVICE_ATTR(in3_min, S_IWUSR | S_IRUGO,
329 show_in_min, set_in_min, 3);
330static SENSOR_DEVICE_ATTR(in4_min, S_IWUSR | S_IRUGO,
331 show_in_min, set_in_min, 4);
332static SENSOR_DEVICE_ATTR(in5_min, S_IWUSR | S_IRUGO,
333 show_in_min, set_in_min, 5);
334static SENSOR_DEVICE_ATTR(in6_min, S_IWUSR | S_IRUGO,
335 show_in_min, set_in_min, 6);
336static SENSOR_DEVICE_ATTR(in0_max, S_IWUSR | S_IRUGO,
337 show_in_max, set_in_max, 0);
338static SENSOR_DEVICE_ATTR(in1_max, S_IWUSR | S_IRUGO,
339 show_in_max, set_in_max, 1);
340static SENSOR_DEVICE_ATTR(in2_max, S_IWUSR | S_IRUGO,
341 show_in_max, set_in_max, 2);
342static SENSOR_DEVICE_ATTR(in3_max, S_IWUSR | S_IRUGO,
343 show_in_max, set_in_max, 3);
344static SENSOR_DEVICE_ATTR(in4_max, S_IWUSR | S_IRUGO,
345 show_in_max, set_in_max, 4);
346static SENSOR_DEVICE_ATTR(in5_max, S_IWUSR | S_IRUGO,
347 show_in_max, set_in_max, 5);
348static SENSOR_DEVICE_ATTR(in6_max, S_IWUSR | S_IRUGO,
349 show_in_max, set_in_max, 6);
350static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, show_in_input, NULL, 0);
351static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_in_input, NULL, 1);
352static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_in_input, NULL, 2);
353static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_in_input, NULL, 3);
354static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_in_input, NULL, 4);
355static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, show_in_input, NULL, 5);
356static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, show_in_input, NULL, 6);
357static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO,
358 show_fan_min, set_fan_min, 0);
359static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR | S_IRUGO,
360 show_fan_min, set_fan_min, 1);
361static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0);
362static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1);
363static SENSOR_DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO,
364 show_fan_div, set_fan_div, 0);
365static SENSOR_DEVICE_ATTR(fan2_div, S_IWUSR | S_IRUGO,
366 show_fan_div, set_fan_div, 1);
1da177e4
LT		 367static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
368static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_hot_max,
369 set_temp_hot_max);
370static DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp_hot_hyst,
371 set_temp_hot_hyst);
372static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_os_max,
373 set_temp_os_max);
374static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp_os_hyst,
375 set_temp_os_hyst);
376static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
e84542f5
JD		 377static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
378static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
379static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
380static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
381static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 4);
382static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 5);
383static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6);
384static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 10);
385static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 11);
386static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 8);
387static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 13);
1da177e4
LT		 388
389/*
390 * Real code
391 */
392
0501a381 393static struct attribute *lm80_attributes[] = {
f8181762
JD		 394 &sensor_dev_attr_in0_min.dev_attr.attr,
395 &sensor_dev_attr_in1_min.dev_attr.attr,
396 &sensor_dev_attr_in2_min.dev_attr.attr,
397 &sensor_dev_attr_in3_min.dev_attr.attr,
398 &sensor_dev_attr_in4_min.dev_attr.attr,
399 &sensor_dev_attr_in5_min.dev_attr.attr,
400 &sensor_dev_attr_in6_min.dev_attr.attr,
401 &sensor_dev_attr_in0_max.dev_attr.attr,
402 &sensor_dev_attr_in1_max.dev_attr.attr,
403 &sensor_dev_attr_in2_max.dev_attr.attr,
404 &sensor_dev_attr_in3_max.dev_attr.attr,
405 &sensor_dev_attr_in4_max.dev_attr.attr,
406 &sensor_dev_attr_in5_max.dev_attr.attr,
407 &sensor_dev_attr_in6_max.dev_attr.attr,
408 &sensor_dev_attr_in0_input.dev_attr.attr,
409 &sensor_dev_attr_in1_input.dev_attr.attr,
410 &sensor_dev_attr_in2_input.dev_attr.attr,
411 &sensor_dev_attr_in3_input.dev_attr.attr,
412 &sensor_dev_attr_in4_input.dev_attr.attr,
413 &sensor_dev_attr_in5_input.dev_attr.attr,
414 &sensor_dev_attr_in6_input.dev_attr.attr,
415 &sensor_dev_attr_fan1_min.dev_attr.attr,
416 &sensor_dev_attr_fan2_min.dev_attr.attr,
417 &sensor_dev_attr_fan1_input.dev_attr.attr,
418 &sensor_dev_attr_fan2_input.dev_attr.attr,
419 &sensor_dev_attr_fan1_div.dev_attr.attr,
420 &sensor_dev_attr_fan2_div.dev_attr.attr,
0501a381
MH		 421 &dev_attr_temp1_input.attr,
422 &dev_attr_temp1_max.attr,
423 &dev_attr_temp1_max_hyst.attr,
424 &dev_attr_temp1_crit.attr,
425 &dev_attr_temp1_crit_hyst.attr,
426 &dev_attr_alarms.attr,
e84542f5
JD		 427 &sensor_dev_attr_in0_alarm.dev_attr.attr,
428 &sensor_dev_attr_in1_alarm.dev_attr.attr,
429 &sensor_dev_attr_in2_alarm.dev_attr.attr,
430 &sensor_dev_attr_in3_alarm.dev_attr.attr,
431 &sensor_dev_attr_in4_alarm.dev_attr.attr,
432 &sensor_dev_attr_in5_alarm.dev_attr.attr,
433 &sensor_dev_attr_in6_alarm.dev_attr.attr,
434 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
435 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
436 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
437 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
0501a381
MH		 438 NULL
439};
440
441static const struct attribute_group lm80_group = {
442 .attrs = lm80_attributes,
443};
444
8c8bacc8 445/* Return 0 if detection is successful, -ENODEV otherwise */
310ec792 446static int lm80_detect(struct i2c_client *client, struct i2c_board_info *info)
1da177e4 447{
8c8bacc8 448 struct i2c_adapter *adapter = client->adapter;
1da177e4 449 int i, cur;
1da177e4
LT		 450
451 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
8c8bacc8 452 return -ENODEV;
1da177e4
LT		 453
454 /* Now, we do the remaining detection. It is lousy. */
6cc37ee5 455 if (lm80_read_value(client, LM80_REG_ALARM2) & 0xc0)
8c8bacc8 456 return -ENODEV;
1da177e4 457 for (i = 0x2a; i <= 0x3d; i++) {
6cc37ee5
JD		 458 cur = i2c_smbus_read_byte_data(client, i);
459 if ((i2c_smbus_read_byte_data(client, i + 0x40) != cur)
460 || (i2c_smbus_read_byte_data(client, i + 0x80) != cur)
461 || (i2c_smbus_read_byte_data(client, i + 0xc0) != cur))
8c8bacc8 462 return -ENODEV;
1da177e4
LT		 463 }
464
8c8bacc8 465 strlcpy(info->type, "lm80", I2C_NAME_SIZE);
1da177e4 466
8c8bacc8
JD		 467 return 0;
468}
1da177e4 469
8c8bacc8
JD		 470static int lm80_probe(struct i2c_client *client,
471 const struct i2c_device_id *id)
472{
473 struct lm80_data *data;
474 int err;
475
476 data = kzalloc(sizeof(struct lm80_data), GFP_KERNEL);
477 if (!data) {
478 err = -ENOMEM;
479 goto exit;
480 }
481
482 i2c_set_clientdata(client, data);
483 mutex_init(&data->update_lock);
1da177e4
LT		 484
485 /* Initialize the LM80 chip */
6cc37ee5 486 lm80_init_client(client);
1da177e4
LT		 487
488 /* A few vars need to be filled upon startup */
6cc37ee5
JD		 489 data->fan_min[0] = lm80_read_value(client, LM80_REG_FAN_MIN(1));
490 data->fan_min[1] = lm80_read_value(client, LM80_REG_FAN_MIN(2));
1da177e4
LT		 491
492 /* Register sysfs hooks */
6cc37ee5 493 if ((err = sysfs_create_group(&client->dev.kobj, &lm80_group)))
8c8bacc8 494 goto error_free;
0501a381 495
6cc37ee5 496 data->hwmon_dev = hwmon_device_register(&client->dev);
1beeffe4
TJ		 497 if (IS_ERR(data->hwmon_dev)) {
498 err = PTR_ERR(data->hwmon_dev);
0501a381 499 goto error_remove;
943b0830
MH		 500 }
501
1da177e4
LT		 502 return 0;
503
0501a381 504error_remove:
6cc37ee5 505 sysfs_remove_group(&client->dev.kobj, &lm80_group);
1da177e4
LT		 506error_free:
507 kfree(data);
508exit:
509 return err;
510}
511
8c8bacc8 512static int lm80_remove(struct i2c_client *client)
1da177e4 513{
943b0830 514 struct lm80_data *data = i2c_get_clientdata(client);
1da177e4 515
1beeffe4 516 hwmon_device_unregister(data->hwmon_dev);
0501a381 517 sysfs_remove_group(&client->dev.kobj, &lm80_group);
1da177e4 518
943b0830 519 kfree(data);
1da177e4
LT		 520 return 0;
521}
522
523static int lm80_read_value(struct i2c_client *client, u8 reg)
524{
525 return i2c_smbus_read_byte_data(client, reg);
526}
527
528static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value)
529{
530 return i2c_smbus_write_byte_data(client, reg, value);
531}
532
533/* Called when we have found a new LM80. */
534static void lm80_init_client(struct i2c_client *client)
535{
536 /* Reset all except Watchdog values and last conversion values
537 This sets fan-divs to 2, among others. This makes most other
538 initializations unnecessary */
539 lm80_write_value(client, LM80_REG_CONFIG, 0x80);
540 /* Set 11-bit temperature resolution */
541 lm80_write_value(client, LM80_REG_RES, 0x08);
542
543 /* Start monitoring */
544 lm80_write_value(client, LM80_REG_CONFIG, 0x01);
545}
546
547static struct lm80_data *lm80_update_device(struct device *dev)
548{
549 struct i2c_client *client = to_i2c_client(dev);
550 struct lm80_data *data = i2c_get_clientdata(client);
551 int i;
552
9a61bf63 553 mutex_lock(&data->update_lock);
1da177e4
LT		 554
555 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
556 dev_dbg(&client->dev, "Starting lm80 update\n");
557 for (i = 0; i <= 6; i++) {
558 data->in[i] =
559 lm80_read_value(client, LM80_REG_IN(i));
560 data->in_min[i] =
561 lm80_read_value(client, LM80_REG_IN_MIN(i));
562 data->in_max[i] =
563 lm80_read_value(client, LM80_REG_IN_MAX(i));
564 }
565 data->fan[0] = lm80_read_value(client, LM80_REG_FAN1);
566 data->fan_min[0] =
567 lm80_read_value(client, LM80_REG_FAN_MIN(1));
568 data->fan[1] = lm80_read_value(client, LM80_REG_FAN2);
569 data->fan_min[1] =
570 lm80_read_value(client, LM80_REG_FAN_MIN(2));
571
572 data->temp =
573 (lm80_read_value(client, LM80_REG_TEMP) << 8) |
574 (lm80_read_value(client, LM80_REG_RES) & 0xf0);
575 data->temp_os_max =
576 lm80_read_value(client, LM80_REG_TEMP_OS_MAX);
577 data->temp_os_hyst =
578 lm80_read_value(client, LM80_REG_TEMP_OS_HYST);
579 data->temp_hot_max =
580 lm80_read_value(client, LM80_REG_TEMP_HOT_MAX);
581 data->temp_hot_hyst =
582 lm80_read_value(client, LM80_REG_TEMP_HOT_HYST);
583
584 i = lm80_read_value(client, LM80_REG_FANDIV);
585 data->fan_div[0] = (i >> 2) & 0x03;
586 data->fan_div[1] = (i >> 4) & 0x03;
587 data->alarms = lm80_read_value(client, LM80_REG_ALARM1) +
588 (lm80_read_value(client, LM80_REG_ALARM2) << 8);
589 data->last_updated = jiffies;
590 data->valid = 1;
591 }
592
9a61bf63 593 mutex_unlock(&data->update_lock);
1da177e4
LT		 594
595 return data;
596}
597
598static int __init sensors_lm80_init(void)
599{
600 return i2c_add_driver(&lm80_driver);
601}
602
603static void __exit sensors_lm80_exit(void)
604{
605 i2c_del_driver(&lm80_driver);
606}
607
608MODULE_AUTHOR("Frodo Looijaard <[email protected]> and "
609 "Philip Edelbrock <[email protected]>");
610MODULE_DESCRIPTION("LM80 driver");
611MODULE_LICENSE("GPL");
612
613module_init(sensors_lm80_init);
614module_exit(sensors_lm80_exit);
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