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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 */ |
35 | static 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 | |
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 | |
72 | static 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 | |
83 | static 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 | |
107 | struct lm80_data { |
108 | struct device *hwmon_dev; |
109 | struct mutex update_lock; |
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 | |
127 | /* |
128 | * Functions declaration |
129 | */ |
130 | |
131 | static int lm80_probe(struct i2c_client *client, |
132 | const struct i2c_device_id *id); |
133 | static int lm80_detect(struct i2c_client *client, struct i2c_board_info *info); |
134 | static void lm80_init_client(struct i2c_client *client); |
135 | static int lm80_remove(struct i2c_client *client); |
136 | static struct lm80_data *lm80_update_device(struct device *dev); |
137 | static int lm80_read_value(struct i2c_client *client, u8 reg); |
138 | static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value); |
139 | |
140 | /* |
141 | * Driver data (common to all clients) |
142 | */ |
143 | |
144 | static const struct i2c_device_id lm80_id[] = { |
145 | { "lm80", 0 }, |
146 | { } |
147 | }; |
148 | MODULE_DEVICE_TABLE(i2c, lm80_id); |
149 | |
150 | static struct i2c_driver lm80_driver = { |
151 | .class = I2C_CLASS_HWMON, |
152 | .driver = { |
153 | .name = "lm80", |
154 | }, |
155 | .probe = lm80_probe, |
156 | .remove = lm80_remove, |
157 | .id_table = lm80_id, |
158 | .detect = lm80_detect, |
159 | .address_list = normal_i2c, |
160 | }; |
161 | |
162 | /* |
163 | * Sysfs stuff |
164 | */ |
165 | |
166 | #define show_in(suffix, value) \ |
167 | static ssize_t show_in_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \ |
168 | { \ |
169 | int nr = to_sensor_dev_attr(attr)->index; \ |
170 | struct lm80_data *data = lm80_update_device(dev); \ |
171 | return sprintf(buf, "%d\n", IN_FROM_REG(data->value[nr])); \ |
172 | } |
173 | show_in(min, in_min) |
174 | show_in(max, in_max) |
175 | show_in(input, in) |
176 | |
177 | #define set_in(suffix, value, reg) \ |
178 | static ssize_t set_in_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \ |
179 | size_t count) \ |
180 | { \ |
181 | int nr = to_sensor_dev_attr(attr)->index; \ |
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 | \ |
186 | mutex_lock(&data->update_lock);\ |
187 | data->value[nr] = IN_TO_REG(val); \ |
188 | lm80_write_value(client, reg(nr), data->value[nr]); \ |
189 | mutex_unlock(&data->update_lock);\ |
190 | return count; \ |
191 | } |
192 | set_in(min, in_min, LM80_REG_IN_MIN) |
193 | set_in(max, in_max, LM80_REG_IN_MAX) |
194 | |
195 | #define show_fan(suffix, value) \ |
196 | static ssize_t show_fan_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \ |
197 | { \ |
198 | int nr = to_sensor_dev_attr(attr)->index; \ |
199 | struct lm80_data *data = lm80_update_device(dev); \ |
200 | return sprintf(buf, "%d\n", FAN_FROM_REG(data->value[nr], \ |
201 | DIV_FROM_REG(data->fan_div[nr]))); \ |
202 | } |
203 | show_fan(min, fan_min) |
204 | show_fan(input, fan) |
205 | |
206 | static 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])); |
212 | } |
213 | |
214 | static 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; |
227 | } |
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 |
231 | least surprise; the user doesn't expect the fan minimum to change just |
232 | because the divisor changed. */ |
233 | static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr, |
234 | const char *buf, size_t count) |
235 | { |
236 | int nr = to_sensor_dev_attr(attr)->index; |
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 */ |
243 | mutex_lock(&data->update_lock); |
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); |
255 | mutex_unlock(&data->update_lock); |
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]); |
266 | mutex_unlock(&data->update_lock); |
267 | |
268 | return count; |
269 | } |
270 | |
271 | static ssize_t show_temp_input1(struct device *dev, struct device_attribute *attr, char *buf) |
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) \ |
278 | static ssize_t show_temp_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \ |
279 | { \ |
280 | struct lm80_data *data = lm80_update_device(dev); \ |
281 | return sprintf(buf, "%d\n", TEMP_LIMIT_FROM_REG(data->value)); \ |
282 | } |
283 | show_temp(hot_max, temp_hot_max); |
284 | show_temp(hot_hyst, temp_hot_hyst); |
285 | show_temp(os_max, temp_os_max); |
286 | show_temp(os_hyst, temp_os_hyst); |
287 | |
288 | #define set_temp(suffix, value, reg) \ |
289 | static ssize_t set_temp_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \ |
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 | \ |
296 | mutex_lock(&data->update_lock); \ |
297 | data->value = TEMP_LIMIT_TO_REG(val); \ |
298 | lm80_write_value(client, reg, data->value); \ |
299 | mutex_unlock(&data->update_lock); \ |
300 | return count; \ |
301 | } |
302 | set_temp(hot_max, temp_hot_max, LM80_REG_TEMP_HOT_MAX); |
303 | set_temp(hot_hyst, temp_hot_hyst, LM80_REG_TEMP_HOT_HYST); |
304 | set_temp(os_max, temp_os_max, LM80_REG_TEMP_OS_MAX); |
305 | set_temp(os_hyst, temp_os_hyst, LM80_REG_TEMP_OS_HYST); |
306 | |
307 | static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, |
308 | char *buf) |
309 | { |
310 | struct lm80_data *data = lm80_update_device(dev); |
311 | return sprintf(buf, "%u\n", data->alarms); |
312 | } |
313 | |
314 | static 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 | |
322 | static SENSOR_DEVICE_ATTR(in0_min, S_IWUSR | S_IRUGO, |
323 | show_in_min, set_in_min, 0); |
324 | static SENSOR_DEVICE_ATTR(in1_min, S_IWUSR | S_IRUGO, |
325 | show_in_min, set_in_min, 1); |
326 | static SENSOR_DEVICE_ATTR(in2_min, S_IWUSR | S_IRUGO, |
327 | show_in_min, set_in_min, 2); |
328 | static SENSOR_DEVICE_ATTR(in3_min, S_IWUSR | S_IRUGO, |
329 | show_in_min, set_in_min, 3); |
330 | static SENSOR_DEVICE_ATTR(in4_min, S_IWUSR | S_IRUGO, |
331 | show_in_min, set_in_min, 4); |
332 | static SENSOR_DEVICE_ATTR(in5_min, S_IWUSR | S_IRUGO, |
333 | show_in_min, set_in_min, 5); |
334 | static SENSOR_DEVICE_ATTR(in6_min, S_IWUSR | S_IRUGO, |
335 | show_in_min, set_in_min, 6); |
336 | static SENSOR_DEVICE_ATTR(in0_max, S_IWUSR | S_IRUGO, |
337 | show_in_max, set_in_max, 0); |
338 | static SENSOR_DEVICE_ATTR(in1_max, S_IWUSR | S_IRUGO, |
339 | show_in_max, set_in_max, 1); |
340 | static SENSOR_DEVICE_ATTR(in2_max, S_IWUSR | S_IRUGO, |
341 | show_in_max, set_in_max, 2); |
342 | static SENSOR_DEVICE_ATTR(in3_max, S_IWUSR | S_IRUGO, |
343 | show_in_max, set_in_max, 3); |
344 | static SENSOR_DEVICE_ATTR(in4_max, S_IWUSR | S_IRUGO, |
345 | show_in_max, set_in_max, 4); |
346 | static SENSOR_DEVICE_ATTR(in5_max, S_IWUSR | S_IRUGO, |
347 | show_in_max, set_in_max, 5); |
348 | static SENSOR_DEVICE_ATTR(in6_max, S_IWUSR | S_IRUGO, |
349 | show_in_max, set_in_max, 6); |
350 | static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, show_in_input, NULL, 0); |
351 | static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_in_input, NULL, 1); |
352 | static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_in_input, NULL, 2); |
353 | static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_in_input, NULL, 3); |
354 | static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_in_input, NULL, 4); |
355 | static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, show_in_input, NULL, 5); |
356 | static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, show_in_input, NULL, 6); |
357 | static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO, |
358 | show_fan_min, set_fan_min, 0); |
359 | static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR | S_IRUGO, |
360 | show_fan_min, set_fan_min, 1); |
361 | static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0); |
362 | static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1); |
363 | static SENSOR_DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO, |
364 | show_fan_div, set_fan_div, 0); |
365 | static SENSOR_DEVICE_ATTR(fan2_div, S_IWUSR | S_IRUGO, |
366 | show_fan_div, set_fan_div, 1); |
367 | static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL); |
368 | static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_hot_max, |
369 | set_temp_hot_max); |
370 | static DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp_hot_hyst, |
371 | set_temp_hot_hyst); |
372 | static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_os_max, |
373 | set_temp_os_max); |
374 | static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp_os_hyst, |
375 | set_temp_os_hyst); |
376 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); |
377 | static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0); |
378 | static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1); |
379 | static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2); |
380 | static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3); |
381 | static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 4); |
382 | static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 5); |
383 | static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6); |
384 | static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 10); |
385 | static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 11); |
386 | static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 8); |
387 | static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 13); |
388 | |
389 | /* |
390 | * Real code |
391 | */ |
392 | |
393 | static struct attribute *lm80_attributes[] = { |
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, |
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, |
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, |
438 | NULL |
439 | }; |
440 | |
441 | static const struct attribute_group lm80_group = { |
442 | .attrs = lm80_attributes, |
443 | }; |
444 | |
445 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
446 | static int lm80_detect(struct i2c_client *client, struct i2c_board_info *info) |
447 | { |
448 | struct i2c_adapter *adapter = client->adapter; |
449 | int i, cur; |
450 | |
451 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
452 | return -ENODEV; |
453 | |
454 | /* Now, we do the remaining detection. It is lousy. */ |
455 | if (lm80_read_value(client, LM80_REG_ALARM2) & 0xc0) |
456 | return -ENODEV; |
457 | for (i = 0x2a; i <= 0x3d; i++) { |
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)) |
462 | return -ENODEV; |
463 | } |
464 | |
465 | strlcpy(info->type, "lm80", I2C_NAME_SIZE); |
466 | |
467 | return 0; |
468 | } |
469 | |
470 | static 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); |
484 | |
485 | /* Initialize the LM80 chip */ |
486 | lm80_init_client(client); |
487 | |
488 | /* A few vars need to be filled upon startup */ |
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)); |
491 | |
492 | /* Register sysfs hooks */ |
493 | if ((err = sysfs_create_group(&client->dev.kobj, &lm80_group))) |
494 | goto error_free; |
495 | |
496 | data->hwmon_dev = hwmon_device_register(&client->dev); |
497 | if (IS_ERR(data->hwmon_dev)) { |
498 | err = PTR_ERR(data->hwmon_dev); |
499 | goto error_remove; |
500 | } |
501 | |
502 | return 0; |
503 | |
504 | error_remove: |
505 | sysfs_remove_group(&client->dev.kobj, &lm80_group); |
506 | error_free: |
507 | kfree(data); |
508 | exit: |
509 | return err; |
510 | } |
511 | |
512 | static int lm80_remove(struct i2c_client *client) |
513 | { |
514 | struct lm80_data *data = i2c_get_clientdata(client); |
515 | |
516 | hwmon_device_unregister(data->hwmon_dev); |
517 | sysfs_remove_group(&client->dev.kobj, &lm80_group); |
518 | |
519 | kfree(data); |
520 | return 0; |
521 | } |
522 | |
523 | static int lm80_read_value(struct i2c_client *client, u8 reg) |
524 | { |
525 | return i2c_smbus_read_byte_data(client, reg); |
526 | } |
527 | |
528 | static 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. */ |
534 | static 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 | |
547 | static 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 | |
553 | mutex_lock(&data->update_lock); |
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 | |
593 | mutex_unlock(&data->update_lock); |
594 | |
595 | return data; |
596 | } |
597 | |
598 | static int __init sensors_lm80_init(void) |
599 | { |
600 | return i2c_add_driver(&lm80_driver); |
601 | } |
602 | |
603 | static void __exit sensors_lm80_exit(void) |
604 | { |
605 | i2c_del_driver(&lm80_driver); |
606 | } |
607 | |
608 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and " |
609 | "Philip Edelbrock <phil@netroedge.com>"); |
610 | MODULE_DESCRIPTION("LM80 driver"); |
611 | MODULE_LICENSE("GPL"); |
612 | |
613 | module_init(sensors_lm80_init); |
614 | module_exit(sensors_lm80_exit); |
615 |
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