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hwmon: (lm80) Various cleanups
[deliverable/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 <frodol@dds.nl>
5 * and Philip Edelbrock <phil@netroedge.com>
6 *
7 * Ported to Linux 2.6 by Tiago Sousa <mirage@kaotik.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
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
MH		 29#include <linux/hwmon.h>
30#include <linux/err.h>
9a61bf63 31#include <linux/mutex.h>
1da177e4
LT		 32
33/* Addresses to scan */
34static unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c,
35 0x2d, 0x2e, 0x2f, I2C_CLIENT_END };
1da177e4
LT		 36
37/* Insmod parameters */
f4b50261 38I2C_CLIENT_INSMOD_1(lm80);
1da177e4
LT		 39
40/* Many LM80 constants specified below */
41
42/* The LM80 registers */
43#define LM80_REG_IN_MAX(nr) (0x2a + (nr) * 2)
44#define LM80_REG_IN_MIN(nr) (0x2b + (nr) * 2)
45#define LM80_REG_IN(nr) (0x20 + (nr))
46
47#define LM80_REG_FAN1 0x28
48#define LM80_REG_FAN2 0x29
49#define LM80_REG_FAN_MIN(nr) (0x3b + (nr))
50
51#define LM80_REG_TEMP 0x27
52#define LM80_REG_TEMP_HOT_MAX 0x38
53#define LM80_REG_TEMP_HOT_HYST 0x39
54#define LM80_REG_TEMP_OS_MAX 0x3a
55#define LM80_REG_TEMP_OS_HYST 0x3b
56
57#define LM80_REG_CONFIG 0x00
58#define LM80_REG_ALARM1 0x01
59#define LM80_REG_ALARM2 0x02
60#define LM80_REG_MASK1 0x03
61#define LM80_REG_MASK2 0x04
62#define LM80_REG_FANDIV 0x05
63#define LM80_REG_RES 0x06
64
65
66/* Conversions. Rounding and limit checking is only done on the TO_REG
67 variants. Note that you should be a bit careful with which arguments
68 these macros are called: arguments may be evaluated more than once.
69 Fixing this is just not worth it. */
70
71#define IN_TO_REG(val) (SENSORS_LIMIT(((val)+5)/10,0,255))
72#define IN_FROM_REG(val) ((val)*10)
73
74static inline unsigned char FAN_TO_REG(unsigned rpm, unsigned div)
75{
76 if (rpm == 0)
77 return 255;
78 rpm = SENSORS_LIMIT(rpm, 1, 1000000);
79 return SENSORS_LIMIT((1350000 + rpm*div / 2) / (rpm*div), 1, 254);
80}
81
82#define FAN_FROM_REG(val,div) ((val)==0?-1:\
83 (val)==255?0:1350000/((div)*(val)))
84
85static inline long TEMP_FROM_REG(u16 temp)
86{
87 long res;
88
89 temp >>= 4;
90 if (temp < 0x0800)
91 res = 625 * (long) temp;
92 else
93 res = ((long) temp - 0x01000) * 625;
94
95 return res / 10;
96}
97
98#define TEMP_LIMIT_FROM_REG(val) (((val)>0x80?(val)-0x100:(val))*1000)
99
100#define TEMP_LIMIT_TO_REG(val) SENSORS_LIMIT((val)<0?\
101 ((val)-500)/1000:((val)+500)/1000,0,255)
102
103#define DIV_FROM_REG(val) (1 << (val))
104
105/*
106 * Client data (each client gets its own)
107 */
108
109struct lm80_data {
110 struct i2c_client client;
1beeffe4 111 struct device *hwmon_dev;
9a61bf63 112 struct mutex update_lock;
1da177e4
LT		 113 char valid; /* !=0 if following fields are valid */
114 unsigned long last_updated; /* In jiffies */
115
116 u8 in[7]; /* Register value */
117 u8 in_max[7]; /* Register value */
118 u8 in_min[7]; /* Register value */
119 u8 fan[2]; /* Register value */
120 u8 fan_min[2]; /* Register value */
121 u8 fan_div[2]; /* Register encoding, shifted right */
122 u16 temp; /* Register values, shifted right */
123 u8 temp_hot_max; /* Register value */
124 u8 temp_hot_hyst; /* Register value */
125 u8 temp_os_max; /* Register value */
126 u8 temp_os_hyst; /* Register value */
127 u16 alarms; /* Register encoding, combined */
128};
129
6cc37ee5 130/*
1da177e4
LT		 131 * Functions declaration
132 */
133
134static int lm80_attach_adapter(struct i2c_adapter *adapter);
135static int lm80_detect(struct i2c_adapter *adapter, int address, int kind);
136static void lm80_init_client(struct i2c_client *client);
137static int lm80_detach_client(struct i2c_client *client);
138static struct lm80_data *lm80_update_device(struct device *dev);
139static int lm80_read_value(struct i2c_client *client, u8 reg);
140static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value);
141
142/*
143 * Driver data (common to all clients)
144 */
145
146static struct i2c_driver lm80_driver = {
cdaf7934 147 .driver = {
cdaf7934
LR		 148 .name = "lm80",
149 },
1da177e4
LT		 150 .attach_adapter = lm80_attach_adapter,
151 .detach_client = lm80_detach_client,
152};
153
154/*
155 * Sysfs stuff
156 */
157
158#define show_in(suffix, value) \
8627f9ba 159static ssize_t show_in_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
1da177e4
LT		 160{ \
161 struct lm80_data *data = lm80_update_device(dev); \
162 return sprintf(buf, "%d\n", IN_FROM_REG(data->value)); \
163}
164show_in(min0, in_min[0]);
165show_in(min1, in_min[1]);
166show_in(min2, in_min[2]);
167show_in(min3, in_min[3]);
168show_in(min4, in_min[4]);
169show_in(min5, in_min[5]);
170show_in(min6, in_min[6]);
171show_in(max0, in_max[0]);
172show_in(max1, in_max[1]);
173show_in(max2, in_max[2]);
174show_in(max3, in_max[3]);
175show_in(max4, in_max[4]);
176show_in(max5, in_max[5]);
177show_in(max6, in_max[6]);
178show_in(input0, in[0]);
179show_in(input1, in[1]);
180show_in(input2, in[2]);
181show_in(input3, in[3]);
182show_in(input4, in[4]);
183show_in(input5, in[5]);
184show_in(input6, in[6]);
185
186#define set_in(suffix, value, reg) \
8627f9ba 187static ssize_t set_in_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
1da177e4
LT		 188 size_t count) \
189{ \
190 struct i2c_client *client = to_i2c_client(dev); \
191 struct lm80_data *data = i2c_get_clientdata(client); \
192 long val = simple_strtol(buf, NULL, 10); \
193 \
9a61bf63 194 mutex_lock(&data->update_lock);\
1da177e4
LT		 195 data->value = IN_TO_REG(val); \
196 lm80_write_value(client, reg, data->value); \
9a61bf63 197 mutex_unlock(&data->update_lock);\
1da177e4
LT		 198 return count; \
199}
200set_in(min0, in_min[0], LM80_REG_IN_MIN(0));
201set_in(min1, in_min[1], LM80_REG_IN_MIN(1));
202set_in(min2, in_min[2], LM80_REG_IN_MIN(2));
203set_in(min3, in_min[3], LM80_REG_IN_MIN(3));
204set_in(min4, in_min[4], LM80_REG_IN_MIN(4));
205set_in(min5, in_min[5], LM80_REG_IN_MIN(5));
206set_in(min6, in_min[6], LM80_REG_IN_MIN(6));
207set_in(max0, in_max[0], LM80_REG_IN_MAX(0));
208set_in(max1, in_max[1], LM80_REG_IN_MAX(1));
209set_in(max2, in_max[2], LM80_REG_IN_MAX(2));
210set_in(max3, in_max[3], LM80_REG_IN_MAX(3));
211set_in(max4, in_max[4], LM80_REG_IN_MAX(4));
212set_in(max5, in_max[5], LM80_REG_IN_MAX(5));
213set_in(max6, in_max[6], LM80_REG_IN_MAX(6));
214
215#define show_fan(suffix, value, div) \
8627f9ba 216static ssize_t show_fan_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
1da177e4
LT		 217{ \
218 struct lm80_data *data = lm80_update_device(dev); \
219 return sprintf(buf, "%d\n", FAN_FROM_REG(data->value, \
220 DIV_FROM_REG(data->div))); \
221}
222show_fan(min1, fan_min[0], fan_div[0]);
223show_fan(min2, fan_min[1], fan_div[1]);
224show_fan(input1, fan[0], fan_div[0]);
225show_fan(input2, fan[1], fan_div[1]);
226
227#define show_fan_div(suffix, value) \
8627f9ba 228static ssize_t show_fan_div##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
1da177e4
LT		 229{ \
230 struct lm80_data *data = lm80_update_device(dev); \
231 return sprintf(buf, "%d\n", DIV_FROM_REG(data->value)); \
232}
233show_fan_div(1, fan_div[0]);
234show_fan_div(2, fan_div[1]);
235
236#define set_fan(suffix, value, reg, div) \
8627f9ba 237static ssize_t set_fan_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
1da177e4
LT		 238 size_t count) \
239{ \
240 struct i2c_client *client = to_i2c_client(dev); \
241 struct lm80_data *data = i2c_get_clientdata(client); \
242 long val = simple_strtoul(buf, NULL, 10); \
243 \
9a61bf63 244 mutex_lock(&data->update_lock);\
1da177e4
LT		 245 data->value = FAN_TO_REG(val, DIV_FROM_REG(data->div)); \
246 lm80_write_value(client, reg, data->value); \
9a61bf63 247 mutex_unlock(&data->update_lock);\
1da177e4
LT		 248 return count; \
249}
250set_fan(min1, fan_min[0], LM80_REG_FAN_MIN(1), fan_div[0]);
251set_fan(min2, fan_min[1], LM80_REG_FAN_MIN(2), fan_div[1]);
252
253/* Note: we save and restore the fan minimum here, because its value is
254 determined in part by the fan divisor. This follows the principle of
d6e05edc 255 least surprise; the user doesn't expect the fan minimum to change just
1da177e4
LT		 256 because the divisor changed. */
257static ssize_t set_fan_div(struct device *dev, const char *buf,
258 size_t count, int nr)
259{
260 struct i2c_client *client = to_i2c_client(dev);
261 struct lm80_data *data = i2c_get_clientdata(client);
262 unsigned long min, val = simple_strtoul(buf, NULL, 10);
263 u8 reg;
264
265 /* Save fan_min */
9a61bf63 266 mutex_lock(&data->update_lock);
1da177e4
LT		 267 min = FAN_FROM_REG(data->fan_min[nr],
268 DIV_FROM_REG(data->fan_div[nr]));
269
270 switch (val) {
271 case 1: data->fan_div[nr] = 0; break;
272 case 2: data->fan_div[nr] = 1; break;
273 case 4: data->fan_div[nr] = 2; break;
274 case 8: data->fan_div[nr] = 3; break;
275 default:
276 dev_err(&client->dev, "fan_div value %ld not "
277 "supported. Choose one of 1, 2, 4 or 8!\n", val);
9a61bf63 278 mutex_unlock(&data->update_lock);
1da177e4
LT		 279 return -EINVAL;
280 }
281
282 reg = (lm80_read_value(client, LM80_REG_FANDIV) & ~(3 << (2 * (nr + 1))))
283 | (data->fan_div[nr] << (2 * (nr + 1)));
284 lm80_write_value(client, LM80_REG_FANDIV, reg);
285
286 /* Restore fan_min */
287 data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
288 lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]);
9a61bf63 289 mutex_unlock(&data->update_lock);
1da177e4
LT		 290
291 return count;
292}
293
294#define set_fan_div(number) \
8627f9ba 295static ssize_t set_fan_div##number(struct device *dev, struct device_attribute *attr, const char *buf, \
1da177e4
LT		 296 size_t count) \
297{ \
298 return set_fan_div(dev, buf, count, number - 1); \
299}
300set_fan_div(1);
301set_fan_div(2);
302
8627f9ba 303static ssize_t show_temp_input1(struct device *dev, struct device_attribute *attr, char *buf)
1da177e4
LT		 304{
305 struct lm80_data *data = lm80_update_device(dev);
306 return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp));
307}
308
309#define show_temp(suffix, value) \
8627f9ba 310static ssize_t show_temp_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
1da177e4
LT		 311{ \
312 struct lm80_data *data = lm80_update_device(dev); \
313 return sprintf(buf, "%d\n", TEMP_LIMIT_FROM_REG(data->value)); \
314}
315show_temp(hot_max, temp_hot_max);
316show_temp(hot_hyst, temp_hot_hyst);
317show_temp(os_max, temp_os_max);
318show_temp(os_hyst, temp_os_hyst);
319
320#define set_temp(suffix, value, reg) \
8627f9ba 321static ssize_t set_temp_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
1da177e4
LT		 322 size_t count) \
323{ \
324 struct i2c_client *client = to_i2c_client(dev); \
325 struct lm80_data *data = i2c_get_clientdata(client); \
326 long val = simple_strtoul(buf, NULL, 10); \
327 \
9a61bf63 328 mutex_lock(&data->update_lock); \
1da177e4
LT		 329 data->value = TEMP_LIMIT_TO_REG(val); \
330 lm80_write_value(client, reg, data->value); \
9a61bf63 331 mutex_unlock(&data->update_lock); \
1da177e4
LT		 332 return count; \
333}
334set_temp(hot_max, temp_hot_max, LM80_REG_TEMP_HOT_MAX);
335set_temp(hot_hyst, temp_hot_hyst, LM80_REG_TEMP_HOT_HYST);
336set_temp(os_max, temp_os_max, LM80_REG_TEMP_OS_MAX);
337set_temp(os_hyst, temp_os_hyst, LM80_REG_TEMP_OS_HYST);
338
6cc37ee5
JD		 339static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
340 char *buf)
1da177e4
LT		 341{
342 struct lm80_data *data = lm80_update_device(dev);
343 return sprintf(buf, "%u\n", data->alarms);
344}
345
346static DEVICE_ATTR(in0_min, S_IWUSR | S_IRUGO, show_in_min0, set_in_min0);
347static DEVICE_ATTR(in1_min, S_IWUSR | S_IRUGO, show_in_min1, set_in_min1);
348static DEVICE_ATTR(in2_min, S_IWUSR | S_IRUGO, show_in_min2, set_in_min2);
349static DEVICE_ATTR(in3_min, S_IWUSR | S_IRUGO, show_in_min3, set_in_min3);
350static DEVICE_ATTR(in4_min, S_IWUSR | S_IRUGO, show_in_min4, set_in_min4);
351static DEVICE_ATTR(in5_min, S_IWUSR | S_IRUGO, show_in_min5, set_in_min5);
352static DEVICE_ATTR(in6_min, S_IWUSR | S_IRUGO, show_in_min6, set_in_min6);
353static DEVICE_ATTR(in0_max, S_IWUSR | S_IRUGO, show_in_max0, set_in_max0);
354static DEVICE_ATTR(in1_max, S_IWUSR | S_IRUGO, show_in_max1, set_in_max1);
355static DEVICE_ATTR(in2_max, S_IWUSR | S_IRUGO, show_in_max2, set_in_max2);
356static DEVICE_ATTR(in3_max, S_IWUSR | S_IRUGO, show_in_max3, set_in_max3);
357static DEVICE_ATTR(in4_max, S_IWUSR | S_IRUGO, show_in_max4, set_in_max4);
358static DEVICE_ATTR(in5_max, S_IWUSR | S_IRUGO, show_in_max5, set_in_max5);
359static DEVICE_ATTR(in6_max, S_IWUSR | S_IRUGO, show_in_max6, set_in_max6);
360static DEVICE_ATTR(in0_input, S_IRUGO, show_in_input0, NULL);
361static DEVICE_ATTR(in1_input, S_IRUGO, show_in_input1, NULL);
362static DEVICE_ATTR(in2_input, S_IRUGO, show_in_input2, NULL);
363static DEVICE_ATTR(in3_input, S_IRUGO, show_in_input3, NULL);
364static DEVICE_ATTR(in4_input, S_IRUGO, show_in_input4, NULL);
365static DEVICE_ATTR(in5_input, S_IRUGO, show_in_input5, NULL);
366static DEVICE_ATTR(in6_input, S_IRUGO, show_in_input6, NULL);
367static DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan_min1,
368 set_fan_min1);
369static DEVICE_ATTR(fan2_min, S_IWUSR | S_IRUGO, show_fan_min2,
370 set_fan_min2);
371static DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input1, NULL);
372static DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input2, NULL);
373static DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO, show_fan_div1, set_fan_div1);
374static DEVICE_ATTR(fan2_div, S_IWUSR | S_IRUGO, show_fan_div2, set_fan_div2);
375static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
376static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_hot_max,
377 set_temp_hot_max);
378static DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp_hot_hyst,
379 set_temp_hot_hyst);
380static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_os_max,
381 set_temp_os_max);
382static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp_os_hyst,
383 set_temp_os_hyst);
384static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
385
386/*
387 * Real code
388 */
389
390static int lm80_attach_adapter(struct i2c_adapter *adapter)
391{
392 if (!(adapter->class & I2C_CLASS_HWMON))
393 return 0;
2ed2dc3c 394 return i2c_probe(adapter, &addr_data, lm80_detect);
1da177e4
LT		 395}
396
0501a381
MH		 397static struct attribute *lm80_attributes[] = {
398 &dev_attr_in0_min.attr,
399 &dev_attr_in1_min.attr,
400 &dev_attr_in2_min.attr,
401 &dev_attr_in3_min.attr,
402 &dev_attr_in4_min.attr,
403 &dev_attr_in5_min.attr,
404 &dev_attr_in6_min.attr,
405 &dev_attr_in0_max.attr,
406 &dev_attr_in1_max.attr,
407 &dev_attr_in2_max.attr,
408 &dev_attr_in3_max.attr,
409 &dev_attr_in4_max.attr,
410 &dev_attr_in5_max.attr,
411 &dev_attr_in6_max.attr,
412 &dev_attr_in0_input.attr,
413 &dev_attr_in1_input.attr,
414 &dev_attr_in2_input.attr,
415 &dev_attr_in3_input.attr,
416 &dev_attr_in4_input.attr,
417 &dev_attr_in5_input.attr,
418 &dev_attr_in6_input.attr,
419 &dev_attr_fan1_min.attr,
420 &dev_attr_fan2_min.attr,
421 &dev_attr_fan1_input.attr,
422 &dev_attr_fan2_input.attr,
423 &dev_attr_fan1_div.attr,
424 &dev_attr_fan2_div.attr,
425 &dev_attr_temp1_input.attr,
426 &dev_attr_temp1_max.attr,
427 &dev_attr_temp1_max_hyst.attr,
428 &dev_attr_temp1_crit.attr,
429 &dev_attr_temp1_crit_hyst.attr,
430 &dev_attr_alarms.attr,
431
432 NULL
433};
434
435static const struct attribute_group lm80_group = {
436 .attrs = lm80_attributes,
437};
438
c49efcef 439static int lm80_detect(struct i2c_adapter *adapter, int address, int kind)
1da177e4
LT		 440{
441 int i, cur;
6cc37ee5 442 struct i2c_client *client;
1da177e4
LT		 443 struct lm80_data *data;
444 int err = 0;
445 const char *name;
446
447 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
448 goto exit;
449
450 /* OK. For now, we presume we have a valid client. We now create the
451 client structure, even though we cannot fill it completely yet.
452 But it allows us to access lm80_{read,write}_value. */
ba9c2e8d 453 if (!(data = kzalloc(sizeof(struct lm80_data), GFP_KERNEL))) {
1da177e4
LT		 454 err = -ENOMEM;
455 goto exit;
456 }
1da177e4 457
6cc37ee5
JD		 458 client = &data->client;
459 i2c_set_clientdata(client, data);
460 client->addr = address;
461 client->adapter = adapter;
462 client->driver = &lm80_driver;
1da177e4
LT		 463
464 /* Now, we do the remaining detection. It is lousy. */
6cc37ee5 465 if (lm80_read_value(client, LM80_REG_ALARM2) & 0xc0)
1da177e4
LT		 466 goto error_free;
467 for (i = 0x2a; i <= 0x3d; i++) {
6cc37ee5
JD		 468 cur = i2c_smbus_read_byte_data(client, i);
469 if ((i2c_smbus_read_byte_data(client, i + 0x40) != cur)
470 || (i2c_smbus_read_byte_data(client, i + 0x80) != cur)
471 || (i2c_smbus_read_byte_data(client, i + 0xc0) != cur))
1da177e4
LT		 472 goto error_free;
473 }
474
475 /* Determine the chip type - only one kind supported! */
476 kind = lm80;
477 name = "lm80";
478
6cc37ee5
JD		 479 /* Fill in the remaining client fields */
480 strlcpy(client->name, name, I2C_NAME_SIZE);
9a61bf63 481 mutex_init(&data->update_lock);
1da177e4
LT		 482
483 /* Tell the I2C layer a new client has arrived */
6cc37ee5 484 if ((err = i2c_attach_client(client)))
1da177e4
LT		 485 goto error_free;
486
487 /* Initialize the LM80 chip */
6cc37ee5 488 lm80_init_client(client);
1da177e4
LT		 489
490 /* A few vars need to be filled upon startup */
6cc37ee5
JD		 491 data->fan_min[0] = lm80_read_value(client, LM80_REG_FAN_MIN(1));
492 data->fan_min[1] = lm80_read_value(client, LM80_REG_FAN_MIN(2));
1da177e4
LT		 493
494 /* Register sysfs hooks */
6cc37ee5 495 if ((err = sysfs_create_group(&client->dev.kobj, &lm80_group)))
0501a381
MH		 496 goto error_detach;
497
6cc37ee5 498 data->hwmon_dev = hwmon_device_register(&client->dev);
1beeffe4
TJ		 499 if (IS_ERR(data->hwmon_dev)) {
500 err = PTR_ERR(data->hwmon_dev);
0501a381 501 goto error_remove;
943b0830
MH		 502 }
503
1da177e4
LT		 504 return 0;
505
0501a381 506error_remove:
6cc37ee5 507 sysfs_remove_group(&client->dev.kobj, &lm80_group);
943b0830 508error_detach:
6cc37ee5 509 i2c_detach_client(client);
1da177e4
LT		 510error_free:
511 kfree(data);
512exit:
513 return err;
514}
515
516static int lm80_detach_client(struct i2c_client *client)
517{
943b0830 518 struct lm80_data *data = i2c_get_clientdata(client);
1da177e4
LT		 519 int err;
520
1beeffe4 521 hwmon_device_unregister(data->hwmon_dev);
0501a381 522 sysfs_remove_group(&client->dev.kobj, &lm80_group);
7bef5594 523 if ((err = i2c_detach_client(client)))
1da177e4 524 return err;
1da177e4 525
943b0830 526 kfree(data);
1da177e4
LT		 527 return 0;
528}
529
530static int lm80_read_value(struct i2c_client *client, u8 reg)
531{
532 return i2c_smbus_read_byte_data(client, reg);
533}
534
535static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value)
536{
537 return i2c_smbus_write_byte_data(client, reg, value);
538}
539
540/* Called when we have found a new LM80. */
541static void lm80_init_client(struct i2c_client *client)
542{
543 /* Reset all except Watchdog values and last conversion values
544 This sets fan-divs to 2, among others. This makes most other
545 initializations unnecessary */
546 lm80_write_value(client, LM80_REG_CONFIG, 0x80);
547 /* Set 11-bit temperature resolution */
548 lm80_write_value(client, LM80_REG_RES, 0x08);
549
550 /* Start monitoring */
551 lm80_write_value(client, LM80_REG_CONFIG, 0x01);
552}
553
554static struct lm80_data *lm80_update_device(struct device *dev)
555{
556 struct i2c_client *client = to_i2c_client(dev);
557 struct lm80_data *data = i2c_get_clientdata(client);
558 int i;
559
9a61bf63 560 mutex_lock(&data->update_lock);
1da177e4
LT		 561
562 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
563 dev_dbg(&client->dev, "Starting lm80 update\n");
564 for (i = 0; i <= 6; i++) {
565 data->in[i] =
566 lm80_read_value(client, LM80_REG_IN(i));
567 data->in_min[i] =
568 lm80_read_value(client, LM80_REG_IN_MIN(i));
569 data->in_max[i] =
570 lm80_read_value(client, LM80_REG_IN_MAX(i));
571 }
572 data->fan[0] = lm80_read_value(client, LM80_REG_FAN1);
573 data->fan_min[0] =
574 lm80_read_value(client, LM80_REG_FAN_MIN(1));
575 data->fan[1] = lm80_read_value(client, LM80_REG_FAN2);
576 data->fan_min[1] =
577 lm80_read_value(client, LM80_REG_FAN_MIN(2));
578
579 data->temp =
580 (lm80_read_value(client, LM80_REG_TEMP) << 8) |
581 (lm80_read_value(client, LM80_REG_RES) & 0xf0);
582 data->temp_os_max =
583 lm80_read_value(client, LM80_REG_TEMP_OS_MAX);
584 data->temp_os_hyst =
585 lm80_read_value(client, LM80_REG_TEMP_OS_HYST);
586 data->temp_hot_max =
587 lm80_read_value(client, LM80_REG_TEMP_HOT_MAX);
588 data->temp_hot_hyst =
589 lm80_read_value(client, LM80_REG_TEMP_HOT_HYST);
590
591 i = lm80_read_value(client, LM80_REG_FANDIV);
592 data->fan_div[0] = (i >> 2) & 0x03;
593 data->fan_div[1] = (i >> 4) & 0x03;
594 data->alarms = lm80_read_value(client, LM80_REG_ALARM1) +
595 (lm80_read_value(client, LM80_REG_ALARM2) << 8);
596 data->last_updated = jiffies;
597 data->valid = 1;
598 }
599
9a61bf63 600 mutex_unlock(&data->update_lock);
1da177e4
LT		 601
602 return data;
603}
604
605static int __init sensors_lm80_init(void)
606{
607 return i2c_add_driver(&lm80_driver);
608}
609
610static void __exit sensors_lm80_exit(void)
611{
612 i2c_del_driver(&lm80_driver);
613}
614
615MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
616 "Philip Edelbrock <phil@netroedge.com>");
617MODULE_DESCRIPTION("LM80 driver");
618MODULE_LICENSE("GPL");
619
620module_init(sensors_lm80_init);
621module_exit(sensors_lm80_exit);
Linux kernel - Deliverables
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