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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
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>
29#include <linux/hwmon.h>
30#include <linux/hwmon-sysfs.h>
31#include <linux/err.h>
32#include <linux/mutex.h>
33
34/* Addresses to scan */
35static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
36 0x2e, 0x2f, I2C_CLIENT_END };
37
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#define LM96080_REG_CONV_RATE 0x07
64#define LM96080_REG_MAN_ID 0x3e
65#define LM96080_REG_DEV_ID 0x3f
66
67
68/*
69 * Conversions. Rounding and limit checking is only done on the TO_REG
70 * variants. Note that you should be a bit careful with which arguments
71 * these macros are called: arguments may be evaluated more than once.
72 * Fixing this is just not worth it.
73 */
74
75#define IN_TO_REG(val) (SENSORS_LIMIT(((val) + 5) / 10, 0, 255))
76#define IN_FROM_REG(val) ((val) * 10)
77
78static inline unsigned char FAN_TO_REG(unsigned rpm, unsigned div)
79{
80 if (rpm == 0)
81 return 255;
82 rpm = SENSORS_LIMIT(rpm, 1, 1000000);
83 return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
84}
85
86#define FAN_FROM_REG(val, div) ((val) == 0 ? -1 : \
87 (val) == 255 ? 0 : 1350000/((div) * (val)))
88
89static inline long TEMP_FROM_REG(u16 temp)
90{
91 long res;
92
93 temp >>= 4;
94 if (temp < 0x0800)
95 res = 625 * (long) temp;
96 else
97 res = ((long) temp - 0x01000) * 625;
98
99 return res / 10;
100}
101
102#define TEMP_LIMIT_FROM_REG(val) (((val) > 0x80 ? \
103 (val) - 0x100 : (val)) * 1000)
104
105#define TEMP_LIMIT_TO_REG(val) SENSORS_LIMIT((val) < 0 ? \
106 ((val) - 500) / 1000 : ((val) + 500) / 1000, 0, 255)
107
108#define DIV_FROM_REG(val) (1 << (val))
109
110/*
111 * Client data (each client gets its own)
112 */
113
114struct lm80_data {
115 struct device *hwmon_dev;
116 struct mutex update_lock;
117 char error; /* !=0 if error occurred during last update */
118 char valid; /* !=0 if following fields are valid */
119 unsigned long last_updated; /* In jiffies */
120
121 u8 in[7]; /* Register value */
122 u8 in_max[7]; /* Register value */
123 u8 in_min[7]; /* Register value */
124 u8 fan[2]; /* Register value */
125 u8 fan_min[2]; /* Register value */
126 u8 fan_div[2]; /* Register encoding, shifted right */
127 u16 temp; /* Register values, shifted right */
128 u8 temp_hot_max; /* Register value */
129 u8 temp_hot_hyst; /* Register value */
130 u8 temp_os_max; /* Register value */
131 u8 temp_os_hyst; /* Register value */
132 u16 alarms; /* Register encoding, combined */
133};
134
135/*
136 * Functions declaration
137 */
138
139static int lm80_probe(struct i2c_client *client,
140 const struct i2c_device_id *id);
141static int lm80_detect(struct i2c_client *client, struct i2c_board_info *info);
142static void lm80_init_client(struct i2c_client *client);
143static int lm80_remove(struct i2c_client *client);
144static struct lm80_data *lm80_update_device(struct device *dev);
145static int lm80_read_value(struct i2c_client *client, u8 reg);
146static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value);
147
148/*
149 * Driver data (common to all clients)
150 */
151
152static const struct i2c_device_id lm80_id[] = {
153 { "lm80", 0 },
154 { "lm96080", 1 },
155 { }
156};
157MODULE_DEVICE_TABLE(i2c, lm80_id);
158
159static struct i2c_driver lm80_driver = {
160 .class = I2C_CLASS_HWMON,
161 .driver = {
162 .name = "lm80",
163 },
164 .probe = lm80_probe,
165 .remove = lm80_remove,
166 .id_table = lm80_id,
167 .detect = lm80_detect,
168 .address_list = normal_i2c,
169};
170
171/*
172 * Sysfs stuff
173 */
174
175#define show_in(suffix, value) \
176static ssize_t show_in_##suffix(struct device *dev, \
177 struct device_attribute *attr, char *buf) \
178{ \
179 int nr = to_sensor_dev_attr(attr)->index; \
180 struct lm80_data *data = lm80_update_device(dev); \
181 if (IS_ERR(data)) \
182 return PTR_ERR(data); \
183 return sprintf(buf, "%d\n", IN_FROM_REG(data->value[nr])); \
184}
185show_in(min, in_min)
186show_in(max, in_max)
187show_in(input, in)
188
189#define set_in(suffix, value, reg) \
190static ssize_t set_in_##suffix(struct device *dev, \
191 struct device_attribute *attr, const char *buf, size_t count) \
192{ \
193 int nr = to_sensor_dev_attr(attr)->index; \
194 struct i2c_client *client = to_i2c_client(dev); \
195 struct lm80_data *data = i2c_get_clientdata(client); \
196 long val; \
197 int err = kstrtol(buf, 10, &val); \
198 if (err < 0) \
199 return err; \
200\
201 mutex_lock(&data->update_lock);\
202 data->value[nr] = IN_TO_REG(val); \
203 lm80_write_value(client, reg(nr), data->value[nr]); \
204 mutex_unlock(&data->update_lock);\
205 return count; \
206}
207set_in(min, in_min, LM80_REG_IN_MIN)
208set_in(max, in_max, LM80_REG_IN_MAX)
209
210#define show_fan(suffix, value) \
211static ssize_t show_fan_##suffix(struct device *dev, \
212 struct device_attribute *attr, char *buf) \
213{ \
214 int nr = to_sensor_dev_attr(attr)->index; \
215 struct lm80_data *data = lm80_update_device(dev); \
216 if (IS_ERR(data)) \
217 return PTR_ERR(data); \
218 return sprintf(buf, "%d\n", FAN_FROM_REG(data->value[nr], \
219 DIV_FROM_REG(data->fan_div[nr]))); \
220}
221show_fan(min, fan_min)
222show_fan(input, fan)
223
224static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
225 char *buf)
226{
227 int nr = to_sensor_dev_attr(attr)->index;
228 struct lm80_data *data = lm80_update_device(dev);
229 if (IS_ERR(data))
230 return PTR_ERR(data);
231 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
232}
233
234static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
235 const char *buf, size_t count)
236{
237 int nr = to_sensor_dev_attr(attr)->index;
238 struct i2c_client *client = to_i2c_client(dev);
239 struct lm80_data *data = i2c_get_clientdata(client);
240 unsigned long val;
241 int err = kstrtoul(buf, 10, &val);
242 if (err < 0)
243 return err;
244
245 mutex_lock(&data->update_lock);
246 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
247 lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]);
248 mutex_unlock(&data->update_lock);
249 return count;
250}
251
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
255 * least surprise; the user doesn't expect the fan minimum to change just
256 * because the divisor changed.
257 */
258static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
259 const char *buf, size_t count)
260{
261 int nr = to_sensor_dev_attr(attr)->index;
262 struct i2c_client *client = to_i2c_client(dev);
263 struct lm80_data *data = i2c_get_clientdata(client);
264 unsigned long min, val;
265 u8 reg;
266 int err = kstrtoul(buf, 10, &val);
267 if (err < 0)
268 return err;
269
270 /* Save fan_min */
271 mutex_lock(&data->update_lock);
272 min = FAN_FROM_REG(data->fan_min[nr],
273 DIV_FROM_REG(data->fan_div[nr]));
274
275 switch (val) {
276 case 1:
277 data->fan_div[nr] = 0;
278 break;
279 case 2:
280 data->fan_div[nr] = 1;
281 break;
282 case 4:
283 data->fan_div[nr] = 2;
284 break;
285 case 8:
286 data->fan_div[nr] = 3;
287 break;
288 default:
289 dev_err(&client->dev, "fan_div value %ld not "
290 "supported. Choose one of 1, 2, 4 or 8!\n", val);
291 mutex_unlock(&data->update_lock);
292 return -EINVAL;
293 }
294
295 reg = (lm80_read_value(client, LM80_REG_FANDIV) & ~(3 << (2 * (nr + 1))))
296 | (data->fan_div[nr] << (2 * (nr + 1)));
297 lm80_write_value(client, LM80_REG_FANDIV, reg);
298
299 /* Restore fan_min */
300 data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
301 lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]);
302 mutex_unlock(&data->update_lock);
303
304 return count;
305}
306
307static ssize_t show_temp_input1(struct device *dev,
308 struct device_attribute *attr, char *buf)
309{
310 struct lm80_data *data = lm80_update_device(dev);
311 if (IS_ERR(data))
312 return PTR_ERR(data);
313 return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp));
314}
315
316#define show_temp(suffix, value) \
317static ssize_t show_temp_##suffix(struct device *dev, \
318 struct device_attribute *attr, char *buf) \
319{ \
320 struct lm80_data *data = lm80_update_device(dev); \
321 if (IS_ERR(data)) \
322 return PTR_ERR(data); \
323 return sprintf(buf, "%d\n", TEMP_LIMIT_FROM_REG(data->value)); \
324}
325show_temp(hot_max, temp_hot_max);
326show_temp(hot_hyst, temp_hot_hyst);
327show_temp(os_max, temp_os_max);
328show_temp(os_hyst, temp_os_hyst);
329
330#define set_temp(suffix, value, reg) \
331static ssize_t set_temp_##suffix(struct device *dev, \
332 struct device_attribute *attr, const char *buf, size_t count) \
333{ \
334 struct i2c_client *client = to_i2c_client(dev); \
335 struct lm80_data *data = i2c_get_clientdata(client); \
336 long val; \
337 int err = kstrtol(buf, 10, &val); \
338 if (err < 0) \
339 return err; \
340\
341 mutex_lock(&data->update_lock); \
342 data->value = TEMP_LIMIT_TO_REG(val); \
343 lm80_write_value(client, reg, data->value); \
344 mutex_unlock(&data->update_lock); \
345 return count; \
346}
347set_temp(hot_max, temp_hot_max, LM80_REG_TEMP_HOT_MAX);
348set_temp(hot_hyst, temp_hot_hyst, LM80_REG_TEMP_HOT_HYST);
349set_temp(os_max, temp_os_max, LM80_REG_TEMP_OS_MAX);
350set_temp(os_hyst, temp_os_hyst, LM80_REG_TEMP_OS_HYST);
351
352static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
353 char *buf)
354{
355 struct lm80_data *data = lm80_update_device(dev);
356 if (IS_ERR(data))
357 return PTR_ERR(data);
358 return sprintf(buf, "%u\n", data->alarms);
359}
360
361static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
362 char *buf)
363{
364 int bitnr = to_sensor_dev_attr(attr)->index;
365 struct lm80_data *data = lm80_update_device(dev);
366 if (IS_ERR(data))
367 return PTR_ERR(data);
368 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
369}
370
371static SENSOR_DEVICE_ATTR(in0_min, S_IWUSR | S_IRUGO,
372 show_in_min, set_in_min, 0);
373static SENSOR_DEVICE_ATTR(in1_min, S_IWUSR | S_IRUGO,
374 show_in_min, set_in_min, 1);
375static SENSOR_DEVICE_ATTR(in2_min, S_IWUSR | S_IRUGO,
376 show_in_min, set_in_min, 2);
377static SENSOR_DEVICE_ATTR(in3_min, S_IWUSR | S_IRUGO,
378 show_in_min, set_in_min, 3);
379static SENSOR_DEVICE_ATTR(in4_min, S_IWUSR | S_IRUGO,
380 show_in_min, set_in_min, 4);
381static SENSOR_DEVICE_ATTR(in5_min, S_IWUSR | S_IRUGO,
382 show_in_min, set_in_min, 5);
383static SENSOR_DEVICE_ATTR(in6_min, S_IWUSR | S_IRUGO,
384 show_in_min, set_in_min, 6);
385static SENSOR_DEVICE_ATTR(in0_max, S_IWUSR | S_IRUGO,
386 show_in_max, set_in_max, 0);
387static SENSOR_DEVICE_ATTR(in1_max, S_IWUSR | S_IRUGO,
388 show_in_max, set_in_max, 1);
389static SENSOR_DEVICE_ATTR(in2_max, S_IWUSR | S_IRUGO,
390 show_in_max, set_in_max, 2);
391static SENSOR_DEVICE_ATTR(in3_max, S_IWUSR | S_IRUGO,
392 show_in_max, set_in_max, 3);
393static SENSOR_DEVICE_ATTR(in4_max, S_IWUSR | S_IRUGO,
394 show_in_max, set_in_max, 4);
395static SENSOR_DEVICE_ATTR(in5_max, S_IWUSR | S_IRUGO,
396 show_in_max, set_in_max, 5);
397static SENSOR_DEVICE_ATTR(in6_max, S_IWUSR | S_IRUGO,
398 show_in_max, set_in_max, 6);
399static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, show_in_input, NULL, 0);
400static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_in_input, NULL, 1);
401static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_in_input, NULL, 2);
402static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_in_input, NULL, 3);
403static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_in_input, NULL, 4);
404static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, show_in_input, NULL, 5);
405static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, show_in_input, NULL, 6);
406static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO,
407 show_fan_min, set_fan_min, 0);
408static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR | S_IRUGO,
409 show_fan_min, set_fan_min, 1);
410static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0);
411static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1);
412static SENSOR_DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO,
413 show_fan_div, set_fan_div, 0);
414static SENSOR_DEVICE_ATTR(fan2_div, S_IWUSR | S_IRUGO,
415 show_fan_div, set_fan_div, 1);
416static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
417static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_hot_max,
418 set_temp_hot_max);
419static DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp_hot_hyst,
420 set_temp_hot_hyst);
421static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_os_max,
422 set_temp_os_max);
423static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp_os_hyst,
424 set_temp_os_hyst);
425static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
426static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
427static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
428static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
429static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
430static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 4);
431static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 5);
432static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6);
433static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 10);
434static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 11);
435static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 8);
436static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 13);
437
438/*
439 * Real code
440 */
441
442static struct attribute *lm80_attributes[] = {
443 &sensor_dev_attr_in0_min.dev_attr.attr,
444 &sensor_dev_attr_in1_min.dev_attr.attr,
445 &sensor_dev_attr_in2_min.dev_attr.attr,
446 &sensor_dev_attr_in3_min.dev_attr.attr,
447 &sensor_dev_attr_in4_min.dev_attr.attr,
448 &sensor_dev_attr_in5_min.dev_attr.attr,
449 &sensor_dev_attr_in6_min.dev_attr.attr,
450 &sensor_dev_attr_in0_max.dev_attr.attr,
451 &sensor_dev_attr_in1_max.dev_attr.attr,
452 &sensor_dev_attr_in2_max.dev_attr.attr,
453 &sensor_dev_attr_in3_max.dev_attr.attr,
454 &sensor_dev_attr_in4_max.dev_attr.attr,
455 &sensor_dev_attr_in5_max.dev_attr.attr,
456 &sensor_dev_attr_in6_max.dev_attr.attr,
457 &sensor_dev_attr_in0_input.dev_attr.attr,
458 &sensor_dev_attr_in1_input.dev_attr.attr,
459 &sensor_dev_attr_in2_input.dev_attr.attr,
460 &sensor_dev_attr_in3_input.dev_attr.attr,
461 &sensor_dev_attr_in4_input.dev_attr.attr,
462 &sensor_dev_attr_in5_input.dev_attr.attr,
463 &sensor_dev_attr_in6_input.dev_attr.attr,
464 &sensor_dev_attr_fan1_min.dev_attr.attr,
465 &sensor_dev_attr_fan2_min.dev_attr.attr,
466 &sensor_dev_attr_fan1_input.dev_attr.attr,
467 &sensor_dev_attr_fan2_input.dev_attr.attr,
468 &sensor_dev_attr_fan1_div.dev_attr.attr,
469 &sensor_dev_attr_fan2_div.dev_attr.attr,
470 &dev_attr_temp1_input.attr,
471 &dev_attr_temp1_max.attr,
472 &dev_attr_temp1_max_hyst.attr,
473 &dev_attr_temp1_crit.attr,
474 &dev_attr_temp1_crit_hyst.attr,
475 &dev_attr_alarms.attr,
476 &sensor_dev_attr_in0_alarm.dev_attr.attr,
477 &sensor_dev_attr_in1_alarm.dev_attr.attr,
478 &sensor_dev_attr_in2_alarm.dev_attr.attr,
479 &sensor_dev_attr_in3_alarm.dev_attr.attr,
480 &sensor_dev_attr_in4_alarm.dev_attr.attr,
481 &sensor_dev_attr_in5_alarm.dev_attr.attr,
482 &sensor_dev_attr_in6_alarm.dev_attr.attr,
483 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
484 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
485 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
486 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
487 NULL
488};
489
490static const struct attribute_group lm80_group = {
491 .attrs = lm80_attributes,
492};
493
494/* Return 0 if detection is successful, -ENODEV otherwise */
495static int lm80_detect(struct i2c_client *client, struct i2c_board_info *info)
496{
497 struct i2c_adapter *adapter = client->adapter;
498 int i, cur, man_id, dev_id;
499 const char *name = NULL;
500
501 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
502 return -ENODEV;
503
504 /* First check for unused bits, common to both chip types */
505 if ((lm80_read_value(client, LM80_REG_ALARM2) & 0xc0)
506 || (lm80_read_value(client, LM80_REG_CONFIG) & 0x80))
507 return -ENODEV;
508
509 /*
510 * The LM96080 has manufacturer and stepping/die rev registers so we
511 * can just check that. The LM80 does not have such registers so we
512 * have to use a more expensive trick.
513 */
514 man_id = lm80_read_value(client, LM96080_REG_MAN_ID);
515 dev_id = lm80_read_value(client, LM96080_REG_DEV_ID);
516 if (man_id == 0x01 && dev_id == 0x08) {
517 /* Check more unused bits for confirmation */
518 if (lm80_read_value(client, LM96080_REG_CONV_RATE) & 0xfe)
519 return -ENODEV;
520
521 name = "lm96080";
522 } else {
523 /* Check 6-bit addressing */
524 for (i = 0x2a; i <= 0x3d; i++) {
525 cur = i2c_smbus_read_byte_data(client, i);
526 if ((i2c_smbus_read_byte_data(client, i + 0x40) != cur)
527 || (i2c_smbus_read_byte_data(client, i + 0x80) != cur)
528 || (i2c_smbus_read_byte_data(client, i + 0xc0) != cur))
529 return -ENODEV;
530 }
531
532 name = "lm80";
533 }
534
535 strlcpy(info->type, name, I2C_NAME_SIZE);
536
537 return 0;
538}
539
540static int lm80_probe(struct i2c_client *client,
541 const struct i2c_device_id *id)
542{
543 struct lm80_data *data;
544 int err;
545
546 data = kzalloc(sizeof(struct lm80_data), GFP_KERNEL);
547 if (!data) {
548 err = -ENOMEM;
549 goto exit;
550 }
551
552 i2c_set_clientdata(client, data);
553 mutex_init(&data->update_lock);
554
555 /* Initialize the LM80 chip */
556 lm80_init_client(client);
557
558 /* A few vars need to be filled upon startup */
559 data->fan_min[0] = lm80_read_value(client, LM80_REG_FAN_MIN(1));
560 data->fan_min[1] = lm80_read_value(client, LM80_REG_FAN_MIN(2));
561
562 /* Register sysfs hooks */
563 err = sysfs_create_group(&client->dev.kobj, &lm80_group);
564 if (err)
565 goto error_free;
566
567 data->hwmon_dev = hwmon_device_register(&client->dev);
568 if (IS_ERR(data->hwmon_dev)) {
569 err = PTR_ERR(data->hwmon_dev);
570 goto error_remove;
571 }
572
573 return 0;
574
575error_remove:
576 sysfs_remove_group(&client->dev.kobj, &lm80_group);
577error_free:
578 kfree(data);
579exit:
580 return err;
581}
582
583static int lm80_remove(struct i2c_client *client)
584{
585 struct lm80_data *data = i2c_get_clientdata(client);
586
587 hwmon_device_unregister(data->hwmon_dev);
588 sysfs_remove_group(&client->dev.kobj, &lm80_group);
589
590 kfree(data);
591 return 0;
592}
593
594static int lm80_read_value(struct i2c_client *client, u8 reg)
595{
596 return i2c_smbus_read_byte_data(client, reg);
597}
598
599static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value)
600{
601 return i2c_smbus_write_byte_data(client, reg, value);
602}
603
604/* Called when we have found a new LM80. */
605static void lm80_init_client(struct i2c_client *client)
606{
607 /*
608 * Reset all except Watchdog values and last conversion values
609 * This sets fan-divs to 2, among others. This makes most other
610 * initializations unnecessary
611 */
612 lm80_write_value(client, LM80_REG_CONFIG, 0x80);
613 /* Set 11-bit temperature resolution */
614 lm80_write_value(client, LM80_REG_RES, 0x08);
615
616 /* Start monitoring */
617 lm80_write_value(client, LM80_REG_CONFIG, 0x01);
618}
619
620static struct lm80_data *lm80_update_device(struct device *dev)
621{
622 struct i2c_client *client = to_i2c_client(dev);
623 struct lm80_data *data = i2c_get_clientdata(client);
624 int i;
625 int rv;
626 int prev_rv;
627 struct lm80_data *ret = data;
628
629 mutex_lock(&data->update_lock);
630
631 if (data->error)
632 lm80_init_client(client);
633
634 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
635 dev_dbg(&client->dev, "Starting lm80 update\n");
636 for (i = 0; i <= 6; i++) {
637 rv = lm80_read_value(client, LM80_REG_IN(i));
638 if (rv < 0)
639 goto abort;
640 data->in[i] = rv;
641
642 rv = lm80_read_value(client, LM80_REG_IN_MIN(i));
643 if (rv < 0)
644 goto abort;
645 data->in_min[i] = rv;
646
647 rv = lm80_read_value(client, LM80_REG_IN_MAX(i));
648 if (rv < 0)
649 goto abort;
650 data->in_max[i] = rv;
651 }
652
653 rv = lm80_read_value(client, LM80_REG_FAN1);
654 if (rv < 0)
655 goto abort;
656 data->fan[0] = rv;
657
658 rv = lm80_read_value(client, LM80_REG_FAN_MIN(1));
659 if (rv < 0)
660 goto abort;
661 data->fan_min[0] = rv;
662
663 rv = lm80_read_value(client, LM80_REG_FAN2);
664 if (rv < 0)
665 goto abort;
666 data->fan[1] = rv;
667
668 rv = lm80_read_value(client, LM80_REG_FAN_MIN(2));
669 if (rv < 0)
670 goto abort;
671 data->fan_min[1] = rv;
672
673 prev_rv = rv = lm80_read_value(client, LM80_REG_TEMP);
674 if (rv < 0)
675 goto abort;
676 rv = lm80_read_value(client, LM80_REG_RES);
677 if (rv < 0)
678 goto abort;
679 data->temp = (prev_rv << 8) | (rv & 0xf0);
680
681 rv = lm80_read_value(client, LM80_REG_TEMP_OS_MAX);
682 if (rv < 0)
683 goto abort;
684 data->temp_os_max = rv;
685
686 rv = lm80_read_value(client, LM80_REG_TEMP_OS_HYST);
687 if (rv < 0)
688 goto abort;
689 data->temp_os_hyst = rv;
690
691 rv = lm80_read_value(client, LM80_REG_TEMP_HOT_MAX);
692 if (rv < 0)
693 goto abort;
694 data->temp_hot_max = rv;
695
696 rv = lm80_read_value(client, LM80_REG_TEMP_HOT_HYST);
697 if (rv < 0)
698 goto abort;
699 data->temp_hot_hyst = rv;
700
701 rv = lm80_read_value(client, LM80_REG_FANDIV);
702 if (rv < 0)
703 goto abort;
704 data->fan_div[0] = (rv >> 2) & 0x03;
705 data->fan_div[1] = (rv >> 4) & 0x03;
706
707 prev_rv = rv = lm80_read_value(client, LM80_REG_ALARM1);
708 if (rv < 0)
709 goto abort;
710 rv = lm80_read_value(client, LM80_REG_ALARM2);
711 if (rv < 0)
712 goto abort;
713 data->alarms = prev_rv + (rv << 8);
714
715 data->last_updated = jiffies;
716 data->valid = 1;
717 data->error = 0;
718 }
719 goto done;
720
721abort:
722 ret = ERR_PTR(rv);
723 data->valid = 0;
724 data->error = 1;
725
726done:
727 mutex_unlock(&data->update_lock);
728
729 return ret;
730}
731
732module_i2c_driver(lm80_driver);
733
734MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
735 "Philip Edelbrock <phil@netroedge.com>");
736MODULE_DESCRIPTION("LM80 driver");
737MODULE_LICENSE("GPL");