Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | lm78.c - Part of lm_sensors, Linux kernel modules for hardware | |
3 | monitoring | |
4 | Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | */ | |
20 | ||
1da177e4 LT |
21 | #include <linux/module.h> |
22 | #include <linux/init.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/jiffies.h> | |
25 | #include <linux/i2c.h> | |
fde09509 | 26 | #include <linux/i2c-isa.h> |
943b0830 | 27 | #include <linux/hwmon.h> |
19f673ed | 28 | #include <linux/hwmon-vid.h> |
943b0830 | 29 | #include <linux/err.h> |
9a61bf63 | 30 | #include <linux/mutex.h> |
1da177e4 LT |
31 | #include <asm/io.h> |
32 | ||
33 | /* Addresses to scan */ | |
34 | static unsigned short normal_i2c[] = { 0x20, 0x21, 0x22, 0x23, 0x24, | |
35 | 0x25, 0x26, 0x27, 0x28, 0x29, | |
36 | 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, | |
37 | 0x2f, I2C_CLIENT_END }; | |
2d8672c5 | 38 | static unsigned short isa_address = 0x290; |
1da177e4 LT |
39 | |
40 | /* Insmod parameters */ | |
f4b50261 | 41 | I2C_CLIENT_INSMOD_2(lm78, lm79); |
1da177e4 LT |
42 | |
43 | /* Many LM78 constants specified below */ | |
44 | ||
45 | /* Length of ISA address segment */ | |
46 | #define LM78_EXTENT 8 | |
47 | ||
48 | /* Where are the ISA address/data registers relative to the base address */ | |
49 | #define LM78_ADDR_REG_OFFSET 5 | |
50 | #define LM78_DATA_REG_OFFSET 6 | |
51 | ||
52 | /* The LM78 registers */ | |
53 | #define LM78_REG_IN_MAX(nr) (0x2b + (nr) * 2) | |
54 | #define LM78_REG_IN_MIN(nr) (0x2c + (nr) * 2) | |
55 | #define LM78_REG_IN(nr) (0x20 + (nr)) | |
56 | ||
57 | #define LM78_REG_FAN_MIN(nr) (0x3b + (nr)) | |
58 | #define LM78_REG_FAN(nr) (0x28 + (nr)) | |
59 | ||
60 | #define LM78_REG_TEMP 0x27 | |
61 | #define LM78_REG_TEMP_OVER 0x39 | |
62 | #define LM78_REG_TEMP_HYST 0x3a | |
63 | ||
64 | #define LM78_REG_ALARM1 0x41 | |
65 | #define LM78_REG_ALARM2 0x42 | |
66 | ||
67 | #define LM78_REG_VID_FANDIV 0x47 | |
68 | ||
69 | #define LM78_REG_CONFIG 0x40 | |
70 | #define LM78_REG_CHIPID 0x49 | |
71 | #define LM78_REG_I2C_ADDR 0x48 | |
72 | ||
73 | ||
74 | /* Conversions. Rounding and limit checking is only done on the TO_REG | |
75 | variants. */ | |
76 | ||
77 | /* IN: mV, (0V to 4.08V) | |
78 | REG: 16mV/bit */ | |
79 | static inline u8 IN_TO_REG(unsigned long val) | |
80 | { | |
81 | unsigned long nval = SENSORS_LIMIT(val, 0, 4080); | |
82 | return (nval + 8) / 16; | |
83 | } | |
84 | #define IN_FROM_REG(val) ((val) * 16) | |
85 | ||
86 | static inline u8 FAN_TO_REG(long rpm, int div) | |
87 | { | |
88 | if (rpm <= 0) | |
89 | return 255; | |
90 | return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 254); | |
91 | } | |
92 | ||
93 | static inline int FAN_FROM_REG(u8 val, int div) | |
94 | { | |
95 | return val==0 ? -1 : val==255 ? 0 : 1350000/(val*div); | |
96 | } | |
97 | ||
98 | /* TEMP: mC (-128C to +127C) | |
99 | REG: 1C/bit, two's complement */ | |
100 | static inline s8 TEMP_TO_REG(int val) | |
101 | { | |
102 | int nval = SENSORS_LIMIT(val, -128000, 127000) ; | |
103 | return nval<0 ? (nval-500)/1000 : (nval+500)/1000; | |
104 | } | |
105 | ||
106 | static inline int TEMP_FROM_REG(s8 val) | |
107 | { | |
108 | return val * 1000; | |
109 | } | |
110 | ||
1da177e4 LT |
111 | #define DIV_FROM_REG(val) (1 << (val)) |
112 | ||
113 | /* There are some complications in a module like this. First off, LM78 chips | |
114 | may be both present on the SMBus and the ISA bus, and we have to handle | |
115 | those cases separately at some places. Second, there might be several | |
116 | LM78 chips available (well, actually, that is probably never done; but | |
117 | it is a clean illustration of how to handle a case like that). Finally, | |
118 | a specific chip may be attached to *both* ISA and SMBus, and we would | |
119 | not like to detect it double. Fortunately, in the case of the LM78 at | |
120 | least, a register tells us what SMBus address we are on, so that helps | |
121 | a bit - except if there could be more than one SMBus. Groan. No solution | |
122 | for this yet. */ | |
123 | ||
124 | /* This module may seem overly long and complicated. In fact, it is not so | |
125 | bad. Quite a lot of bookkeeping is done. A real driver can often cut | |
126 | some corners. */ | |
127 | ||
128 | /* For each registered LM78, we need to keep some data in memory. That | |
129 | data is pointed to by lm78_list[NR]->data. The structure itself is | |
130 | dynamically allocated, at the same time when a new lm78 client is | |
131 | allocated. */ | |
132 | struct lm78_data { | |
133 | struct i2c_client client; | |
943b0830 | 134 | struct class_device *class_dev; |
9a61bf63 | 135 | struct mutex lock; |
1da177e4 LT |
136 | enum chips type; |
137 | ||
9a61bf63 | 138 | struct mutex update_lock; |
1da177e4 LT |
139 | char valid; /* !=0 if following fields are valid */ |
140 | unsigned long last_updated; /* In jiffies */ | |
141 | ||
142 | u8 in[7]; /* Register value */ | |
143 | u8 in_max[7]; /* Register value */ | |
144 | u8 in_min[7]; /* Register value */ | |
145 | u8 fan[3]; /* Register value */ | |
146 | u8 fan_min[3]; /* Register value */ | |
147 | s8 temp; /* Register value */ | |
148 | s8 temp_over; /* Register value */ | |
149 | s8 temp_hyst; /* Register value */ | |
150 | u8 fan_div[3]; /* Register encoding, shifted right */ | |
151 | u8 vid; /* Register encoding, combined */ | |
152 | u16 alarms; /* Register encoding, combined */ | |
153 | }; | |
154 | ||
155 | ||
156 | static int lm78_attach_adapter(struct i2c_adapter *adapter); | |
2d8672c5 | 157 | static int lm78_isa_attach_adapter(struct i2c_adapter *adapter); |
1da177e4 LT |
158 | static int lm78_detect(struct i2c_adapter *adapter, int address, int kind); |
159 | static int lm78_detach_client(struct i2c_client *client); | |
160 | ||
f6c27fc1 DJ |
161 | static int lm78_read_value(struct i2c_client *client, u8 reg); |
162 | static int lm78_write_value(struct i2c_client *client, u8 reg, u8 value); | |
1da177e4 LT |
163 | static struct lm78_data *lm78_update_device(struct device *dev); |
164 | static void lm78_init_client(struct i2c_client *client); | |
165 | ||
166 | ||
167 | static struct i2c_driver lm78_driver = { | |
cdaf7934 | 168 | .driver = { |
cdaf7934 LR |
169 | .name = "lm78", |
170 | }, | |
1da177e4 | 171 | .id = I2C_DRIVERID_LM78, |
1da177e4 LT |
172 | .attach_adapter = lm78_attach_adapter, |
173 | .detach_client = lm78_detach_client, | |
174 | }; | |
175 | ||
fde09509 | 176 | static struct i2c_driver lm78_isa_driver = { |
cdaf7934 | 177 | .driver = { |
87218842 | 178 | .owner = THIS_MODULE, |
cdaf7934 LR |
179 | .name = "lm78-isa", |
180 | }, | |
2d8672c5 | 181 | .attach_adapter = lm78_isa_attach_adapter, |
fde09509 JD |
182 | .detach_client = lm78_detach_client, |
183 | }; | |
184 | ||
185 | ||
1da177e4 LT |
186 | /* 7 Voltages */ |
187 | static ssize_t show_in(struct device *dev, char *buf, int nr) | |
188 | { | |
189 | struct lm78_data *data = lm78_update_device(dev); | |
190 | return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr])); | |
191 | } | |
192 | ||
193 | static ssize_t show_in_min(struct device *dev, char *buf, int nr) | |
194 | { | |
195 | struct lm78_data *data = lm78_update_device(dev); | |
196 | return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr])); | |
197 | } | |
198 | ||
199 | static ssize_t show_in_max(struct device *dev, char *buf, int nr) | |
200 | { | |
201 | struct lm78_data *data = lm78_update_device(dev); | |
202 | return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr])); | |
203 | } | |
204 | ||
205 | static ssize_t set_in_min(struct device *dev, const char *buf, | |
206 | size_t count, int nr) | |
207 | { | |
208 | struct i2c_client *client = to_i2c_client(dev); | |
209 | struct lm78_data *data = i2c_get_clientdata(client); | |
210 | unsigned long val = simple_strtoul(buf, NULL, 10); | |
211 | ||
9a61bf63 | 212 | mutex_lock(&data->update_lock); |
1da177e4 LT |
213 | data->in_min[nr] = IN_TO_REG(val); |
214 | lm78_write_value(client, LM78_REG_IN_MIN(nr), data->in_min[nr]); | |
9a61bf63 | 215 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
216 | return count; |
217 | } | |
218 | ||
219 | static ssize_t set_in_max(struct device *dev, const char *buf, | |
220 | size_t count, int nr) | |
221 | { | |
222 | struct i2c_client *client = to_i2c_client(dev); | |
223 | struct lm78_data *data = i2c_get_clientdata(client); | |
224 | unsigned long val = simple_strtoul(buf, NULL, 10); | |
225 | ||
9a61bf63 | 226 | mutex_lock(&data->update_lock); |
1da177e4 LT |
227 | data->in_max[nr] = IN_TO_REG(val); |
228 | lm78_write_value(client, LM78_REG_IN_MAX(nr), data->in_max[nr]); | |
9a61bf63 | 229 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
230 | return count; |
231 | } | |
232 | ||
233 | #define show_in_offset(offset) \ | |
234 | static ssize_t \ | |
8627f9ba | 235 | show_in##offset (struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
236 | { \ |
237 | return show_in(dev, buf, offset); \ | |
238 | } \ | |
239 | static DEVICE_ATTR(in##offset##_input, S_IRUGO, \ | |
240 | show_in##offset, NULL); \ | |
241 | static ssize_t \ | |
8627f9ba | 242 | show_in##offset##_min (struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
243 | { \ |
244 | return show_in_min(dev, buf, offset); \ | |
245 | } \ | |
246 | static ssize_t \ | |
8627f9ba | 247 | show_in##offset##_max (struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
248 | { \ |
249 | return show_in_max(dev, buf, offset); \ | |
250 | } \ | |
8627f9ba | 251 | static ssize_t set_in##offset##_min (struct device *dev, struct device_attribute *attr, \ |
1da177e4 LT |
252 | const char *buf, size_t count) \ |
253 | { \ | |
254 | return set_in_min(dev, buf, count, offset); \ | |
255 | } \ | |
8627f9ba | 256 | static ssize_t set_in##offset##_max (struct device *dev, struct device_attribute *attr, \ |
1da177e4 LT |
257 | const char *buf, size_t count) \ |
258 | { \ | |
259 | return set_in_max(dev, buf, count, offset); \ | |
260 | } \ | |
261 | static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \ | |
262 | show_in##offset##_min, set_in##offset##_min); \ | |
263 | static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \ | |
264 | show_in##offset##_max, set_in##offset##_max); | |
265 | ||
266 | show_in_offset(0); | |
267 | show_in_offset(1); | |
268 | show_in_offset(2); | |
269 | show_in_offset(3); | |
270 | show_in_offset(4); | |
271 | show_in_offset(5); | |
272 | show_in_offset(6); | |
273 | ||
274 | /* Temperature */ | |
8627f9ba | 275 | static ssize_t show_temp(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
276 | { |
277 | struct lm78_data *data = lm78_update_device(dev); | |
278 | return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp)); | |
279 | } | |
280 | ||
8627f9ba | 281 | static ssize_t show_temp_over(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
282 | { |
283 | struct lm78_data *data = lm78_update_device(dev); | |
284 | return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_over)); | |
285 | } | |
286 | ||
8627f9ba | 287 | static ssize_t set_temp_over(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
288 | { |
289 | struct i2c_client *client = to_i2c_client(dev); | |
290 | struct lm78_data *data = i2c_get_clientdata(client); | |
291 | long val = simple_strtol(buf, NULL, 10); | |
292 | ||
9a61bf63 | 293 | mutex_lock(&data->update_lock); |
1da177e4 LT |
294 | data->temp_over = TEMP_TO_REG(val); |
295 | lm78_write_value(client, LM78_REG_TEMP_OVER, data->temp_over); | |
9a61bf63 | 296 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
297 | return count; |
298 | } | |
299 | ||
8627f9ba | 300 | static ssize_t show_temp_hyst(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
301 | { |
302 | struct lm78_data *data = lm78_update_device(dev); | |
303 | return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_hyst)); | |
304 | } | |
305 | ||
8627f9ba | 306 | static ssize_t set_temp_hyst(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
307 | { |
308 | struct i2c_client *client = to_i2c_client(dev); | |
309 | struct lm78_data *data = i2c_get_clientdata(client); | |
310 | long val = simple_strtol(buf, NULL, 10); | |
311 | ||
9a61bf63 | 312 | mutex_lock(&data->update_lock); |
1da177e4 LT |
313 | data->temp_hyst = TEMP_TO_REG(val); |
314 | lm78_write_value(client, LM78_REG_TEMP_HYST, data->temp_hyst); | |
9a61bf63 | 315 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
316 | return count; |
317 | } | |
318 | ||
319 | static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL); | |
320 | static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, | |
321 | show_temp_over, set_temp_over); | |
322 | static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR, | |
323 | show_temp_hyst, set_temp_hyst); | |
324 | ||
325 | /* 3 Fans */ | |
326 | static ssize_t show_fan(struct device *dev, char *buf, int nr) | |
327 | { | |
328 | struct lm78_data *data = lm78_update_device(dev); | |
329 | return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr], | |
330 | DIV_FROM_REG(data->fan_div[nr])) ); | |
331 | } | |
332 | ||
333 | static ssize_t show_fan_min(struct device *dev, char *buf, int nr) | |
334 | { | |
335 | struct lm78_data *data = lm78_update_device(dev); | |
336 | return sprintf(buf,"%d\n", FAN_FROM_REG(data->fan_min[nr], | |
337 | DIV_FROM_REG(data->fan_div[nr])) ); | |
338 | } | |
339 | ||
340 | static ssize_t set_fan_min(struct device *dev, const char *buf, | |
341 | size_t count, int nr) | |
342 | { | |
343 | struct i2c_client *client = to_i2c_client(dev); | |
344 | struct lm78_data *data = i2c_get_clientdata(client); | |
345 | unsigned long val = simple_strtoul(buf, NULL, 10); | |
346 | ||
9a61bf63 | 347 | mutex_lock(&data->update_lock); |
1da177e4 LT |
348 | data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr])); |
349 | lm78_write_value(client, LM78_REG_FAN_MIN(nr), data->fan_min[nr]); | |
9a61bf63 | 350 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
351 | return count; |
352 | } | |
353 | ||
354 | static ssize_t show_fan_div(struct device *dev, char *buf, int nr) | |
355 | { | |
356 | struct lm78_data *data = lm78_update_device(dev); | |
357 | return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]) ); | |
358 | } | |
359 | ||
360 | /* Note: we save and restore the fan minimum here, because its value is | |
361 | determined in part by the fan divisor. This follows the principle of | |
d6e05edc | 362 | least surprise; the user doesn't expect the fan minimum to change just |
1da177e4 LT |
363 | because the divisor changed. */ |
364 | static ssize_t set_fan_div(struct device *dev, const char *buf, | |
365 | size_t count, int nr) | |
366 | { | |
367 | struct i2c_client *client = to_i2c_client(dev); | |
368 | struct lm78_data *data = i2c_get_clientdata(client); | |
369 | unsigned long val = simple_strtoul(buf, NULL, 10); | |
370 | unsigned long min; | |
371 | u8 reg; | |
372 | ||
9a61bf63 | 373 | mutex_lock(&data->update_lock); |
1da177e4 LT |
374 | min = FAN_FROM_REG(data->fan_min[nr], |
375 | DIV_FROM_REG(data->fan_div[nr])); | |
376 | ||
377 | switch (val) { | |
378 | case 1: data->fan_div[nr] = 0; break; | |
379 | case 2: data->fan_div[nr] = 1; break; | |
380 | case 4: data->fan_div[nr] = 2; break; | |
381 | case 8: data->fan_div[nr] = 3; break; | |
382 | default: | |
383 | dev_err(&client->dev, "fan_div value %ld not " | |
384 | "supported. Choose one of 1, 2, 4 or 8!\n", val); | |
9a61bf63 | 385 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
386 | return -EINVAL; |
387 | } | |
388 | ||
389 | reg = lm78_read_value(client, LM78_REG_VID_FANDIV); | |
390 | switch (nr) { | |
391 | case 0: | |
392 | reg = (reg & 0xcf) | (data->fan_div[nr] << 4); | |
393 | break; | |
394 | case 1: | |
395 | reg = (reg & 0x3f) | (data->fan_div[nr] << 6); | |
396 | break; | |
397 | } | |
398 | lm78_write_value(client, LM78_REG_VID_FANDIV, reg); | |
399 | ||
400 | data->fan_min[nr] = | |
401 | FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr])); | |
402 | lm78_write_value(client, LM78_REG_FAN_MIN(nr), data->fan_min[nr]); | |
9a61bf63 | 403 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
404 | |
405 | return count; | |
406 | } | |
407 | ||
408 | #define show_fan_offset(offset) \ | |
8627f9ba | 409 | static ssize_t show_fan_##offset (struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
410 | { \ |
411 | return show_fan(dev, buf, offset - 1); \ | |
412 | } \ | |
8627f9ba | 413 | static ssize_t show_fan_##offset##_min (struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
414 | { \ |
415 | return show_fan_min(dev, buf, offset - 1); \ | |
416 | } \ | |
8627f9ba | 417 | static ssize_t show_fan_##offset##_div (struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
418 | { \ |
419 | return show_fan_div(dev, buf, offset - 1); \ | |
420 | } \ | |
8627f9ba | 421 | static ssize_t set_fan_##offset##_min (struct device *dev, struct device_attribute *attr, \ |
1da177e4 LT |
422 | const char *buf, size_t count) \ |
423 | { \ | |
424 | return set_fan_min(dev, buf, count, offset - 1); \ | |
425 | } \ | |
426 | static DEVICE_ATTR(fan##offset##_input, S_IRUGO, show_fan_##offset, NULL);\ | |
427 | static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \ | |
428 | show_fan_##offset##_min, set_fan_##offset##_min); | |
429 | ||
8627f9ba | 430 | static ssize_t set_fan_1_div(struct device *dev, struct device_attribute *attr, const char *buf, |
1da177e4 LT |
431 | size_t count) |
432 | { | |
433 | return set_fan_div(dev, buf, count, 0) ; | |
434 | } | |
435 | ||
8627f9ba | 436 | static ssize_t set_fan_2_div(struct device *dev, struct device_attribute *attr, const char *buf, |
1da177e4 LT |
437 | size_t count) |
438 | { | |
439 | return set_fan_div(dev, buf, count, 1) ; | |
440 | } | |
441 | ||
442 | show_fan_offset(1); | |
443 | show_fan_offset(2); | |
444 | show_fan_offset(3); | |
445 | ||
446 | /* Fan 3 divisor is locked in H/W */ | |
447 | static DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR, | |
448 | show_fan_1_div, set_fan_1_div); | |
449 | static DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR, | |
450 | show_fan_2_div, set_fan_2_div); | |
451 | static DEVICE_ATTR(fan3_div, S_IRUGO, show_fan_3_div, NULL); | |
452 | ||
453 | /* VID */ | |
8627f9ba | 454 | static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
455 | { |
456 | struct lm78_data *data = lm78_update_device(dev); | |
d0d3cd69 | 457 | return sprintf(buf, "%d\n", vid_from_reg(data->vid, 82)); |
1da177e4 LT |
458 | } |
459 | static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL); | |
460 | ||
461 | /* Alarms */ | |
8627f9ba | 462 | static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
463 | { |
464 | struct lm78_data *data = lm78_update_device(dev); | |
465 | return sprintf(buf, "%u\n", data->alarms); | |
466 | } | |
467 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); | |
468 | ||
469 | /* This function is called when: | |
470 | * lm78_driver is inserted (when this module is loaded), for each | |
471 | available adapter | |
472 | * when a new adapter is inserted (and lm78_driver is still present) */ | |
473 | static int lm78_attach_adapter(struct i2c_adapter *adapter) | |
474 | { | |
475 | if (!(adapter->class & I2C_CLASS_HWMON)) | |
476 | return 0; | |
2ed2dc3c | 477 | return i2c_probe(adapter, &addr_data, lm78_detect); |
1da177e4 LT |
478 | } |
479 | ||
2d8672c5 JD |
480 | static int lm78_isa_attach_adapter(struct i2c_adapter *adapter) |
481 | { | |
482 | return lm78_detect(adapter, isa_address, -1); | |
483 | } | |
484 | ||
c1685f61 MH |
485 | static struct attribute *lm78_attributes[] = { |
486 | &dev_attr_in0_input.attr, | |
487 | &dev_attr_in0_min.attr, | |
488 | &dev_attr_in0_max.attr, | |
489 | &dev_attr_in1_input.attr, | |
490 | &dev_attr_in1_min.attr, | |
491 | &dev_attr_in1_max.attr, | |
492 | &dev_attr_in2_input.attr, | |
493 | &dev_attr_in2_min.attr, | |
494 | &dev_attr_in2_max.attr, | |
495 | &dev_attr_in3_input.attr, | |
496 | &dev_attr_in3_min.attr, | |
497 | &dev_attr_in3_max.attr, | |
498 | &dev_attr_in4_input.attr, | |
499 | &dev_attr_in4_min.attr, | |
500 | &dev_attr_in4_max.attr, | |
501 | &dev_attr_in5_input.attr, | |
502 | &dev_attr_in5_min.attr, | |
503 | &dev_attr_in5_max.attr, | |
504 | &dev_attr_in6_input.attr, | |
505 | &dev_attr_in6_min.attr, | |
506 | &dev_attr_in6_max.attr, | |
507 | &dev_attr_temp1_input.attr, | |
508 | &dev_attr_temp1_max.attr, | |
509 | &dev_attr_temp1_max_hyst.attr, | |
510 | &dev_attr_fan1_input.attr, | |
511 | &dev_attr_fan1_min.attr, | |
512 | &dev_attr_fan1_div.attr, | |
513 | &dev_attr_fan2_input.attr, | |
514 | &dev_attr_fan2_min.attr, | |
515 | &dev_attr_fan2_div.attr, | |
516 | &dev_attr_fan3_input.attr, | |
517 | &dev_attr_fan3_min.attr, | |
518 | &dev_attr_fan3_div.attr, | |
519 | &dev_attr_alarms.attr, | |
520 | &dev_attr_cpu0_vid.attr, | |
521 | ||
522 | NULL | |
523 | }; | |
524 | ||
525 | static const struct attribute_group lm78_group = { | |
526 | .attrs = lm78_attributes, | |
527 | }; | |
528 | ||
2ed2dc3c | 529 | /* This function is called by i2c_probe */ |
d8d20615 | 530 | static int lm78_detect(struct i2c_adapter *adapter, int address, int kind) |
1da177e4 LT |
531 | { |
532 | int i, err; | |
533 | struct i2c_client *new_client; | |
534 | struct lm78_data *data; | |
535 | const char *client_name = ""; | |
536 | int is_isa = i2c_is_isa_adapter(adapter); | |
537 | ||
538 | if (!is_isa && | |
539 | !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { | |
540 | err = -ENODEV; | |
541 | goto ERROR0; | |
542 | } | |
543 | ||
544 | /* Reserve the ISA region */ | |
545 | if (is_isa) | |
fde09509 | 546 | if (!request_region(address, LM78_EXTENT, |
cdaf7934 | 547 | lm78_isa_driver.driver.name)) { |
1da177e4 LT |
548 | err = -EBUSY; |
549 | goto ERROR0; | |
550 | } | |
551 | ||
552 | /* Probe whether there is anything available on this address. Already | |
553 | done for SMBus clients */ | |
554 | if (kind < 0) { | |
555 | if (is_isa) { | |
556 | ||
557 | #define REALLY_SLOW_IO | |
558 | /* We need the timeouts for at least some LM78-like | |
559 | chips. But only if we read 'undefined' registers. */ | |
560 | i = inb_p(address + 1); | |
561 | if (inb_p(address + 2) != i) { | |
562 | err = -ENODEV; | |
563 | goto ERROR1; | |
564 | } | |
565 | if (inb_p(address + 3) != i) { | |
566 | err = -ENODEV; | |
567 | goto ERROR1; | |
568 | } | |
569 | if (inb_p(address + 7) != i) { | |
570 | err = -ENODEV; | |
571 | goto ERROR1; | |
572 | } | |
573 | #undef REALLY_SLOW_IO | |
574 | ||
575 | /* Let's just hope nothing breaks here */ | |
576 | i = inb_p(address + 5) & 0x7f; | |
577 | outb_p(~i & 0x7f, address + 5); | |
578 | if ((inb_p(address + 5) & 0x7f) != (~i & 0x7f)) { | |
579 | outb_p(i, address + 5); | |
580 | err = -ENODEV; | |
581 | goto ERROR1; | |
582 | } | |
583 | } | |
584 | } | |
585 | ||
586 | /* OK. For now, we presume we have a valid client. We now create the | |
587 | client structure, even though we cannot fill it completely yet. | |
588 | But it allows us to access lm78_{read,write}_value. */ | |
589 | ||
ba9c2e8d | 590 | if (!(data = kzalloc(sizeof(struct lm78_data), GFP_KERNEL))) { |
1da177e4 LT |
591 | err = -ENOMEM; |
592 | goto ERROR1; | |
593 | } | |
1da177e4 LT |
594 | |
595 | new_client = &data->client; | |
596 | if (is_isa) | |
9a61bf63 | 597 | mutex_init(&data->lock); |
1da177e4 LT |
598 | i2c_set_clientdata(new_client, data); |
599 | new_client->addr = address; | |
600 | new_client->adapter = adapter; | |
fde09509 | 601 | new_client->driver = is_isa ? &lm78_isa_driver : &lm78_driver; |
1da177e4 LT |
602 | new_client->flags = 0; |
603 | ||
604 | /* Now, we do the remaining detection. */ | |
605 | if (kind < 0) { | |
606 | if (lm78_read_value(new_client, LM78_REG_CONFIG) & 0x80) { | |
607 | err = -ENODEV; | |
608 | goto ERROR2; | |
609 | } | |
610 | if (!is_isa && (lm78_read_value( | |
611 | new_client, LM78_REG_I2C_ADDR) != address)) { | |
612 | err = -ENODEV; | |
613 | goto ERROR2; | |
614 | } | |
615 | } | |
616 | ||
617 | /* Determine the chip type. */ | |
618 | if (kind <= 0) { | |
619 | i = lm78_read_value(new_client, LM78_REG_CHIPID); | |
27fe048e JD |
620 | if (i == 0x00 || i == 0x20 /* LM78 */ |
621 | || i == 0x40) /* LM78-J */ | |
1da177e4 | 622 | kind = lm78; |
1da177e4 LT |
623 | else if ((i & 0xfe) == 0xc0) |
624 | kind = lm79; | |
625 | else { | |
626 | if (kind == 0) | |
627 | dev_warn(&adapter->dev, "Ignoring 'force' " | |
628 | "parameter for unknown chip at " | |
629 | "adapter %d, address 0x%02x\n", | |
630 | i2c_adapter_id(adapter), address); | |
631 | err = -ENODEV; | |
632 | goto ERROR2; | |
633 | } | |
634 | } | |
635 | ||
636 | if (kind == lm78) { | |
637 | client_name = "lm78"; | |
1da177e4 LT |
638 | } else if (kind == lm79) { |
639 | client_name = "lm79"; | |
640 | } | |
641 | ||
642 | /* Fill in the remaining client fields and put into the global list */ | |
643 | strlcpy(new_client->name, client_name, I2C_NAME_SIZE); | |
644 | data->type = kind; | |
645 | ||
646 | data->valid = 0; | |
9a61bf63 | 647 | mutex_init(&data->update_lock); |
1da177e4 LT |
648 | |
649 | /* Tell the I2C layer a new client has arrived */ | |
650 | if ((err = i2c_attach_client(new_client))) | |
651 | goto ERROR2; | |
652 | ||
653 | /* Initialize the LM78 chip */ | |
654 | lm78_init_client(new_client); | |
655 | ||
656 | /* A few vars need to be filled upon startup */ | |
657 | for (i = 0; i < 3; i++) { | |
658 | data->fan_min[i] = lm78_read_value(new_client, | |
659 | LM78_REG_FAN_MIN(i)); | |
660 | } | |
661 | ||
662 | /* Register sysfs hooks */ | |
c1685f61 MH |
663 | if ((err = sysfs_create_group(&new_client->dev.kobj, &lm78_group))) |
664 | goto ERROR3; | |
665 | ||
943b0830 MH |
666 | data->class_dev = hwmon_device_register(&new_client->dev); |
667 | if (IS_ERR(data->class_dev)) { | |
668 | err = PTR_ERR(data->class_dev); | |
c1685f61 | 669 | goto ERROR4; |
943b0830 MH |
670 | } |
671 | ||
1da177e4 LT |
672 | return 0; |
673 | ||
c1685f61 MH |
674 | ERROR4: |
675 | sysfs_remove_group(&new_client->dev.kobj, &lm78_group); | |
943b0830 MH |
676 | ERROR3: |
677 | i2c_detach_client(new_client); | |
1da177e4 LT |
678 | ERROR2: |
679 | kfree(data); | |
680 | ERROR1: | |
681 | if (is_isa) | |
682 | release_region(address, LM78_EXTENT); | |
683 | ERROR0: | |
684 | return err; | |
685 | } | |
686 | ||
687 | static int lm78_detach_client(struct i2c_client *client) | |
688 | { | |
943b0830 | 689 | struct lm78_data *data = i2c_get_clientdata(client); |
1da177e4 LT |
690 | int err; |
691 | ||
943b0830 | 692 | hwmon_device_unregister(data->class_dev); |
c1685f61 | 693 | sysfs_remove_group(&client->dev.kobj, &lm78_group); |
943b0830 | 694 | |
7bef5594 | 695 | if ((err = i2c_detach_client(client))) |
1da177e4 | 696 | return err; |
1da177e4 LT |
697 | |
698 | if(i2c_is_isa_client(client)) | |
699 | release_region(client->addr, LM78_EXTENT); | |
700 | ||
943b0830 | 701 | kfree(data); |
1da177e4 LT |
702 | |
703 | return 0; | |
704 | } | |
705 | ||
44bbe87e | 706 | /* The SMBus locks itself, but ISA access must be locked explicitly! |
1da177e4 LT |
707 | We don't want to lock the whole ISA bus, so we lock each client |
708 | separately. | |
709 | We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks, | |
710 | would slow down the LM78 access and should not be necessary. */ | |
711 | static int lm78_read_value(struct i2c_client *client, u8 reg) | |
712 | { | |
713 | int res; | |
714 | if (i2c_is_isa_client(client)) { | |
715 | struct lm78_data *data = i2c_get_clientdata(client); | |
9a61bf63 | 716 | mutex_lock(&data->lock); |
1da177e4 LT |
717 | outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET); |
718 | res = inb_p(client->addr + LM78_DATA_REG_OFFSET); | |
9a61bf63 | 719 | mutex_unlock(&data->lock); |
1da177e4 LT |
720 | return res; |
721 | } else | |
722 | return i2c_smbus_read_byte_data(client, reg); | |
723 | } | |
724 | ||
44bbe87e | 725 | /* The SMBus locks itself, but ISA access muse be locked explicitly! |
1da177e4 LT |
726 | We don't want to lock the whole ISA bus, so we lock each client |
727 | separately. | |
728 | We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks, | |
729 | would slow down the LM78 access and should not be necessary. | |
730 | There are some ugly typecasts here, but the good new is - they should | |
731 | nowhere else be necessary! */ | |
732 | static int lm78_write_value(struct i2c_client *client, u8 reg, u8 value) | |
733 | { | |
734 | if (i2c_is_isa_client(client)) { | |
735 | struct lm78_data *data = i2c_get_clientdata(client); | |
9a61bf63 | 736 | mutex_lock(&data->lock); |
1da177e4 LT |
737 | outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET); |
738 | outb_p(value, client->addr + LM78_DATA_REG_OFFSET); | |
9a61bf63 | 739 | mutex_unlock(&data->lock); |
1da177e4 LT |
740 | return 0; |
741 | } else | |
742 | return i2c_smbus_write_byte_data(client, reg, value); | |
743 | } | |
744 | ||
1da177e4 LT |
745 | static void lm78_init_client(struct i2c_client *client) |
746 | { | |
747 | u8 config = lm78_read_value(client, LM78_REG_CONFIG); | |
748 | ||
749 | /* Start monitoring */ | |
750 | if (!(config & 0x01)) | |
751 | lm78_write_value(client, LM78_REG_CONFIG, | |
752 | (config & 0xf7) | 0x01); | |
753 | } | |
754 | ||
755 | static struct lm78_data *lm78_update_device(struct device *dev) | |
756 | { | |
757 | struct i2c_client *client = to_i2c_client(dev); | |
758 | struct lm78_data *data = i2c_get_clientdata(client); | |
759 | int i; | |
760 | ||
9a61bf63 | 761 | mutex_lock(&data->update_lock); |
1da177e4 LT |
762 | |
763 | if (time_after(jiffies, data->last_updated + HZ + HZ / 2) | |
764 | || !data->valid) { | |
765 | ||
766 | dev_dbg(&client->dev, "Starting lm78 update\n"); | |
767 | ||
768 | for (i = 0; i <= 6; i++) { | |
769 | data->in[i] = | |
770 | lm78_read_value(client, LM78_REG_IN(i)); | |
771 | data->in_min[i] = | |
772 | lm78_read_value(client, LM78_REG_IN_MIN(i)); | |
773 | data->in_max[i] = | |
774 | lm78_read_value(client, LM78_REG_IN_MAX(i)); | |
775 | } | |
776 | for (i = 0; i < 3; i++) { | |
777 | data->fan[i] = | |
778 | lm78_read_value(client, LM78_REG_FAN(i)); | |
779 | data->fan_min[i] = | |
780 | lm78_read_value(client, LM78_REG_FAN_MIN(i)); | |
781 | } | |
782 | data->temp = lm78_read_value(client, LM78_REG_TEMP); | |
783 | data->temp_over = | |
784 | lm78_read_value(client, LM78_REG_TEMP_OVER); | |
785 | data->temp_hyst = | |
786 | lm78_read_value(client, LM78_REG_TEMP_HYST); | |
787 | i = lm78_read_value(client, LM78_REG_VID_FANDIV); | |
788 | data->vid = i & 0x0f; | |
789 | if (data->type == lm79) | |
790 | data->vid |= | |
791 | (lm78_read_value(client, LM78_REG_CHIPID) & | |
792 | 0x01) << 4; | |
793 | else | |
794 | data->vid |= 0x10; | |
795 | data->fan_div[0] = (i >> 4) & 0x03; | |
796 | data->fan_div[1] = i >> 6; | |
797 | data->alarms = lm78_read_value(client, LM78_REG_ALARM1) + | |
798 | (lm78_read_value(client, LM78_REG_ALARM2) << 8); | |
799 | data->last_updated = jiffies; | |
800 | data->valid = 1; | |
801 | ||
802 | data->fan_div[2] = 1; | |
803 | } | |
804 | ||
9a61bf63 | 805 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
806 | |
807 | return data; | |
808 | } | |
809 | ||
810 | static int __init sm_lm78_init(void) | |
811 | { | |
fde09509 JD |
812 | int res; |
813 | ||
814 | res = i2c_add_driver(&lm78_driver); | |
815 | if (res) | |
816 | return res; | |
817 | ||
e693810c JD |
818 | /* Don't exit if this one fails, we still want the I2C variants |
819 | to work! */ | |
820 | if (i2c_isa_add_driver(&lm78_isa_driver)) | |
821 | isa_address = 0; | |
fde09509 JD |
822 | |
823 | return 0; | |
1da177e4 LT |
824 | } |
825 | ||
826 | static void __exit sm_lm78_exit(void) | |
827 | { | |
e693810c JD |
828 | if (isa_address) |
829 | i2c_isa_del_driver(&lm78_isa_driver); | |
1da177e4 LT |
830 | i2c_del_driver(&lm78_driver); |
831 | } | |
832 | ||
833 | ||
834 | ||
835 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>"); | |
27fe048e | 836 | MODULE_DESCRIPTION("LM78/LM79 driver"); |
1da177e4 LT |
837 | MODULE_LICENSE("GPL"); |
838 | ||
839 | module_init(sm_lm78_init); | |
840 | module_exit(sm_lm78_exit); |