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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 | ||
ed6bafbf JD |
128 | /* For each registered chip, we need to keep some data in memory. |
129 | The structure is dynamically allocated. */ | |
1da177e4 LT |
130 | struct lm78_data { |
131 | struct i2c_client client; | |
943b0830 | 132 | struct class_device *class_dev; |
9a61bf63 | 133 | struct mutex lock; |
1da177e4 LT |
134 | enum chips type; |
135 | ||
9a61bf63 | 136 | struct mutex update_lock; |
1da177e4 LT |
137 | char valid; /* !=0 if following fields are valid */ |
138 | unsigned long last_updated; /* In jiffies */ | |
139 | ||
140 | u8 in[7]; /* Register value */ | |
141 | u8 in_max[7]; /* Register value */ | |
142 | u8 in_min[7]; /* Register value */ | |
143 | u8 fan[3]; /* Register value */ | |
144 | u8 fan_min[3]; /* Register value */ | |
145 | s8 temp; /* Register value */ | |
146 | s8 temp_over; /* Register value */ | |
147 | s8 temp_hyst; /* Register value */ | |
148 | u8 fan_div[3]; /* Register encoding, shifted right */ | |
149 | u8 vid; /* Register encoding, combined */ | |
150 | u16 alarms; /* Register encoding, combined */ | |
151 | }; | |
152 | ||
153 | ||
154 | static int lm78_attach_adapter(struct i2c_adapter *adapter); | |
2d8672c5 | 155 | static int lm78_isa_attach_adapter(struct i2c_adapter *adapter); |
1da177e4 LT |
156 | static int lm78_detect(struct i2c_adapter *adapter, int address, int kind); |
157 | static int lm78_detach_client(struct i2c_client *client); | |
158 | ||
f6c27fc1 DJ |
159 | static int lm78_read_value(struct i2c_client *client, u8 reg); |
160 | static int lm78_write_value(struct i2c_client *client, u8 reg, u8 value); | |
1da177e4 LT |
161 | static struct lm78_data *lm78_update_device(struct device *dev); |
162 | static void lm78_init_client(struct i2c_client *client); | |
163 | ||
164 | ||
165 | static struct i2c_driver lm78_driver = { | |
cdaf7934 | 166 | .driver = { |
cdaf7934 LR |
167 | .name = "lm78", |
168 | }, | |
1da177e4 | 169 | .id = I2C_DRIVERID_LM78, |
1da177e4 LT |
170 | .attach_adapter = lm78_attach_adapter, |
171 | .detach_client = lm78_detach_client, | |
172 | }; | |
173 | ||
fde09509 | 174 | static struct i2c_driver lm78_isa_driver = { |
cdaf7934 | 175 | .driver = { |
87218842 | 176 | .owner = THIS_MODULE, |
cdaf7934 LR |
177 | .name = "lm78-isa", |
178 | }, | |
2d8672c5 | 179 | .attach_adapter = lm78_isa_attach_adapter, |
fde09509 JD |
180 | .detach_client = lm78_detach_client, |
181 | }; | |
182 | ||
183 | ||
1da177e4 LT |
184 | /* 7 Voltages */ |
185 | static ssize_t show_in(struct device *dev, char *buf, int nr) | |
186 | { | |
187 | struct lm78_data *data = lm78_update_device(dev); | |
188 | return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr])); | |
189 | } | |
190 | ||
191 | static ssize_t show_in_min(struct device *dev, char *buf, int nr) | |
192 | { | |
193 | struct lm78_data *data = lm78_update_device(dev); | |
194 | return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr])); | |
195 | } | |
196 | ||
197 | static ssize_t show_in_max(struct device *dev, char *buf, int nr) | |
198 | { | |
199 | struct lm78_data *data = lm78_update_device(dev); | |
200 | return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr])); | |
201 | } | |
202 | ||
203 | static ssize_t set_in_min(struct device *dev, const char *buf, | |
204 | size_t count, int nr) | |
205 | { | |
206 | struct i2c_client *client = to_i2c_client(dev); | |
207 | struct lm78_data *data = i2c_get_clientdata(client); | |
208 | unsigned long val = simple_strtoul(buf, NULL, 10); | |
209 | ||
9a61bf63 | 210 | mutex_lock(&data->update_lock); |
1da177e4 LT |
211 | data->in_min[nr] = IN_TO_REG(val); |
212 | lm78_write_value(client, LM78_REG_IN_MIN(nr), data->in_min[nr]); | |
9a61bf63 | 213 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
214 | return count; |
215 | } | |
216 | ||
217 | static ssize_t set_in_max(struct device *dev, const char *buf, | |
218 | size_t count, int nr) | |
219 | { | |
220 | struct i2c_client *client = to_i2c_client(dev); | |
221 | struct lm78_data *data = i2c_get_clientdata(client); | |
222 | unsigned long val = simple_strtoul(buf, NULL, 10); | |
223 | ||
9a61bf63 | 224 | mutex_lock(&data->update_lock); |
1da177e4 LT |
225 | data->in_max[nr] = IN_TO_REG(val); |
226 | lm78_write_value(client, LM78_REG_IN_MAX(nr), data->in_max[nr]); | |
9a61bf63 | 227 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
228 | return count; |
229 | } | |
230 | ||
231 | #define show_in_offset(offset) \ | |
232 | static ssize_t \ | |
8627f9ba | 233 | show_in##offset (struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
234 | { \ |
235 | return show_in(dev, buf, offset); \ | |
236 | } \ | |
237 | static DEVICE_ATTR(in##offset##_input, S_IRUGO, \ | |
238 | show_in##offset, NULL); \ | |
239 | static ssize_t \ | |
8627f9ba | 240 | show_in##offset##_min (struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
241 | { \ |
242 | return show_in_min(dev, buf, offset); \ | |
243 | } \ | |
244 | static ssize_t \ | |
8627f9ba | 245 | show_in##offset##_max (struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
246 | { \ |
247 | return show_in_max(dev, buf, offset); \ | |
248 | } \ | |
8627f9ba | 249 | static ssize_t set_in##offset##_min (struct device *dev, struct device_attribute *attr, \ |
1da177e4 LT |
250 | const char *buf, size_t count) \ |
251 | { \ | |
252 | return set_in_min(dev, buf, count, offset); \ | |
253 | } \ | |
8627f9ba | 254 | static ssize_t set_in##offset##_max (struct device *dev, struct device_attribute *attr, \ |
1da177e4 LT |
255 | const char *buf, size_t count) \ |
256 | { \ | |
257 | return set_in_max(dev, buf, count, offset); \ | |
258 | } \ | |
259 | static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \ | |
260 | show_in##offset##_min, set_in##offset##_min); \ | |
261 | static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \ | |
262 | show_in##offset##_max, set_in##offset##_max); | |
263 | ||
264 | show_in_offset(0); | |
265 | show_in_offset(1); | |
266 | show_in_offset(2); | |
267 | show_in_offset(3); | |
268 | show_in_offset(4); | |
269 | show_in_offset(5); | |
270 | show_in_offset(6); | |
271 | ||
272 | /* Temperature */ | |
8627f9ba | 273 | static ssize_t show_temp(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
274 | { |
275 | struct lm78_data *data = lm78_update_device(dev); | |
276 | return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp)); | |
277 | } | |
278 | ||
8627f9ba | 279 | static ssize_t show_temp_over(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
280 | { |
281 | struct lm78_data *data = lm78_update_device(dev); | |
282 | return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_over)); | |
283 | } | |
284 | ||
8627f9ba | 285 | static ssize_t set_temp_over(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
286 | { |
287 | struct i2c_client *client = to_i2c_client(dev); | |
288 | struct lm78_data *data = i2c_get_clientdata(client); | |
289 | long val = simple_strtol(buf, NULL, 10); | |
290 | ||
9a61bf63 | 291 | mutex_lock(&data->update_lock); |
1da177e4 LT |
292 | data->temp_over = TEMP_TO_REG(val); |
293 | lm78_write_value(client, LM78_REG_TEMP_OVER, data->temp_over); | |
9a61bf63 | 294 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
295 | return count; |
296 | } | |
297 | ||
8627f9ba | 298 | static ssize_t show_temp_hyst(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
299 | { |
300 | struct lm78_data *data = lm78_update_device(dev); | |
301 | return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_hyst)); | |
302 | } | |
303 | ||
8627f9ba | 304 | static ssize_t set_temp_hyst(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
305 | { |
306 | struct i2c_client *client = to_i2c_client(dev); | |
307 | struct lm78_data *data = i2c_get_clientdata(client); | |
308 | long val = simple_strtol(buf, NULL, 10); | |
309 | ||
9a61bf63 | 310 | mutex_lock(&data->update_lock); |
1da177e4 LT |
311 | data->temp_hyst = TEMP_TO_REG(val); |
312 | lm78_write_value(client, LM78_REG_TEMP_HYST, data->temp_hyst); | |
9a61bf63 | 313 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
314 | return count; |
315 | } | |
316 | ||
317 | static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL); | |
318 | static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, | |
319 | show_temp_over, set_temp_over); | |
320 | static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR, | |
321 | show_temp_hyst, set_temp_hyst); | |
322 | ||
323 | /* 3 Fans */ | |
324 | static ssize_t show_fan(struct device *dev, char *buf, int nr) | |
325 | { | |
326 | struct lm78_data *data = lm78_update_device(dev); | |
327 | return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr], | |
328 | DIV_FROM_REG(data->fan_div[nr])) ); | |
329 | } | |
330 | ||
331 | static ssize_t show_fan_min(struct device *dev, char *buf, int nr) | |
332 | { | |
333 | struct lm78_data *data = lm78_update_device(dev); | |
334 | return sprintf(buf,"%d\n", FAN_FROM_REG(data->fan_min[nr], | |
335 | DIV_FROM_REG(data->fan_div[nr])) ); | |
336 | } | |
337 | ||
338 | static ssize_t set_fan_min(struct device *dev, const char *buf, | |
339 | size_t count, int nr) | |
340 | { | |
341 | struct i2c_client *client = to_i2c_client(dev); | |
342 | struct lm78_data *data = i2c_get_clientdata(client); | |
343 | unsigned long val = simple_strtoul(buf, NULL, 10); | |
344 | ||
9a61bf63 | 345 | mutex_lock(&data->update_lock); |
1da177e4 LT |
346 | data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr])); |
347 | lm78_write_value(client, LM78_REG_FAN_MIN(nr), data->fan_min[nr]); | |
9a61bf63 | 348 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
349 | return count; |
350 | } | |
351 | ||
352 | static ssize_t show_fan_div(struct device *dev, char *buf, int nr) | |
353 | { | |
354 | struct lm78_data *data = lm78_update_device(dev); | |
355 | return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]) ); | |
356 | } | |
357 | ||
358 | /* Note: we save and restore the fan minimum here, because its value is | |
359 | determined in part by the fan divisor. This follows the principle of | |
d6e05edc | 360 | least surprise; the user doesn't expect the fan minimum to change just |
1da177e4 LT |
361 | because the divisor changed. */ |
362 | static ssize_t set_fan_div(struct device *dev, const char *buf, | |
363 | size_t count, int nr) | |
364 | { | |
365 | struct i2c_client *client = to_i2c_client(dev); | |
366 | struct lm78_data *data = i2c_get_clientdata(client); | |
367 | unsigned long val = simple_strtoul(buf, NULL, 10); | |
368 | unsigned long min; | |
369 | u8 reg; | |
370 | ||
9a61bf63 | 371 | mutex_lock(&data->update_lock); |
1da177e4 LT |
372 | min = FAN_FROM_REG(data->fan_min[nr], |
373 | DIV_FROM_REG(data->fan_div[nr])); | |
374 | ||
375 | switch (val) { | |
376 | case 1: data->fan_div[nr] = 0; break; | |
377 | case 2: data->fan_div[nr] = 1; break; | |
378 | case 4: data->fan_div[nr] = 2; break; | |
379 | case 8: data->fan_div[nr] = 3; break; | |
380 | default: | |
381 | dev_err(&client->dev, "fan_div value %ld not " | |
382 | "supported. Choose one of 1, 2, 4 or 8!\n", val); | |
9a61bf63 | 383 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
384 | return -EINVAL; |
385 | } | |
386 | ||
387 | reg = lm78_read_value(client, LM78_REG_VID_FANDIV); | |
388 | switch (nr) { | |
389 | case 0: | |
390 | reg = (reg & 0xcf) | (data->fan_div[nr] << 4); | |
391 | break; | |
392 | case 1: | |
393 | reg = (reg & 0x3f) | (data->fan_div[nr] << 6); | |
394 | break; | |
395 | } | |
396 | lm78_write_value(client, LM78_REG_VID_FANDIV, reg); | |
397 | ||
398 | data->fan_min[nr] = | |
399 | FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr])); | |
400 | lm78_write_value(client, LM78_REG_FAN_MIN(nr), data->fan_min[nr]); | |
9a61bf63 | 401 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
402 | |
403 | return count; | |
404 | } | |
405 | ||
406 | #define show_fan_offset(offset) \ | |
8627f9ba | 407 | static ssize_t show_fan_##offset (struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
408 | { \ |
409 | return show_fan(dev, buf, offset - 1); \ | |
410 | } \ | |
8627f9ba | 411 | static ssize_t show_fan_##offset##_min (struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
412 | { \ |
413 | return show_fan_min(dev, buf, offset - 1); \ | |
414 | } \ | |
8627f9ba | 415 | static ssize_t show_fan_##offset##_div (struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
416 | { \ |
417 | return show_fan_div(dev, buf, offset - 1); \ | |
418 | } \ | |
8627f9ba | 419 | static ssize_t set_fan_##offset##_min (struct device *dev, struct device_attribute *attr, \ |
1da177e4 LT |
420 | const char *buf, size_t count) \ |
421 | { \ | |
422 | return set_fan_min(dev, buf, count, offset - 1); \ | |
423 | } \ | |
424 | static DEVICE_ATTR(fan##offset##_input, S_IRUGO, show_fan_##offset, NULL);\ | |
425 | static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \ | |
426 | show_fan_##offset##_min, set_fan_##offset##_min); | |
427 | ||
8627f9ba | 428 | static ssize_t set_fan_1_div(struct device *dev, struct device_attribute *attr, const char *buf, |
1da177e4 LT |
429 | size_t count) |
430 | { | |
431 | return set_fan_div(dev, buf, count, 0) ; | |
432 | } | |
433 | ||
8627f9ba | 434 | static ssize_t set_fan_2_div(struct device *dev, struct device_attribute *attr, const char *buf, |
1da177e4 LT |
435 | size_t count) |
436 | { | |
437 | return set_fan_div(dev, buf, count, 1) ; | |
438 | } | |
439 | ||
440 | show_fan_offset(1); | |
441 | show_fan_offset(2); | |
442 | show_fan_offset(3); | |
443 | ||
444 | /* Fan 3 divisor is locked in H/W */ | |
445 | static DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR, | |
446 | show_fan_1_div, set_fan_1_div); | |
447 | static DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR, | |
448 | show_fan_2_div, set_fan_2_div); | |
449 | static DEVICE_ATTR(fan3_div, S_IRUGO, show_fan_3_div, NULL); | |
450 | ||
451 | /* VID */ | |
8627f9ba | 452 | static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
453 | { |
454 | struct lm78_data *data = lm78_update_device(dev); | |
d0d3cd69 | 455 | return sprintf(buf, "%d\n", vid_from_reg(data->vid, 82)); |
1da177e4 LT |
456 | } |
457 | static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL); | |
458 | ||
459 | /* Alarms */ | |
8627f9ba | 460 | static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
461 | { |
462 | struct lm78_data *data = lm78_update_device(dev); | |
463 | return sprintf(buf, "%u\n", data->alarms); | |
464 | } | |
465 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); | |
466 | ||
467 | /* This function is called when: | |
468 | * lm78_driver is inserted (when this module is loaded), for each | |
469 | available adapter | |
470 | * when a new adapter is inserted (and lm78_driver is still present) */ | |
471 | static int lm78_attach_adapter(struct i2c_adapter *adapter) | |
472 | { | |
473 | if (!(adapter->class & I2C_CLASS_HWMON)) | |
474 | return 0; | |
2ed2dc3c | 475 | return i2c_probe(adapter, &addr_data, lm78_detect); |
1da177e4 LT |
476 | } |
477 | ||
2d8672c5 JD |
478 | static int lm78_isa_attach_adapter(struct i2c_adapter *adapter) |
479 | { | |
480 | return lm78_detect(adapter, isa_address, -1); | |
481 | } | |
482 | ||
c1685f61 MH |
483 | static struct attribute *lm78_attributes[] = { |
484 | &dev_attr_in0_input.attr, | |
485 | &dev_attr_in0_min.attr, | |
486 | &dev_attr_in0_max.attr, | |
487 | &dev_attr_in1_input.attr, | |
488 | &dev_attr_in1_min.attr, | |
489 | &dev_attr_in1_max.attr, | |
490 | &dev_attr_in2_input.attr, | |
491 | &dev_attr_in2_min.attr, | |
492 | &dev_attr_in2_max.attr, | |
493 | &dev_attr_in3_input.attr, | |
494 | &dev_attr_in3_min.attr, | |
495 | &dev_attr_in3_max.attr, | |
496 | &dev_attr_in4_input.attr, | |
497 | &dev_attr_in4_min.attr, | |
498 | &dev_attr_in4_max.attr, | |
499 | &dev_attr_in5_input.attr, | |
500 | &dev_attr_in5_min.attr, | |
501 | &dev_attr_in5_max.attr, | |
502 | &dev_attr_in6_input.attr, | |
503 | &dev_attr_in6_min.attr, | |
504 | &dev_attr_in6_max.attr, | |
505 | &dev_attr_temp1_input.attr, | |
506 | &dev_attr_temp1_max.attr, | |
507 | &dev_attr_temp1_max_hyst.attr, | |
508 | &dev_attr_fan1_input.attr, | |
509 | &dev_attr_fan1_min.attr, | |
510 | &dev_attr_fan1_div.attr, | |
511 | &dev_attr_fan2_input.attr, | |
512 | &dev_attr_fan2_min.attr, | |
513 | &dev_attr_fan2_div.attr, | |
514 | &dev_attr_fan3_input.attr, | |
515 | &dev_attr_fan3_min.attr, | |
516 | &dev_attr_fan3_div.attr, | |
517 | &dev_attr_alarms.attr, | |
518 | &dev_attr_cpu0_vid.attr, | |
519 | ||
520 | NULL | |
521 | }; | |
522 | ||
523 | static const struct attribute_group lm78_group = { | |
524 | .attrs = lm78_attributes, | |
525 | }; | |
526 | ||
2ed2dc3c | 527 | /* This function is called by i2c_probe */ |
d8d20615 | 528 | static int lm78_detect(struct i2c_adapter *adapter, int address, int kind) |
1da177e4 LT |
529 | { |
530 | int i, err; | |
531 | struct i2c_client *new_client; | |
532 | struct lm78_data *data; | |
533 | const char *client_name = ""; | |
534 | int is_isa = i2c_is_isa_adapter(adapter); | |
535 | ||
536 | if (!is_isa && | |
537 | !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { | |
538 | err = -ENODEV; | |
539 | goto ERROR0; | |
540 | } | |
541 | ||
542 | /* Reserve the ISA region */ | |
543 | if (is_isa) | |
fde09509 | 544 | if (!request_region(address, LM78_EXTENT, |
cdaf7934 | 545 | lm78_isa_driver.driver.name)) { |
1da177e4 LT |
546 | err = -EBUSY; |
547 | goto ERROR0; | |
548 | } | |
549 | ||
550 | /* Probe whether there is anything available on this address. Already | |
551 | done for SMBus clients */ | |
552 | if (kind < 0) { | |
553 | if (is_isa) { | |
554 | ||
555 | #define REALLY_SLOW_IO | |
556 | /* We need the timeouts for at least some LM78-like | |
557 | chips. But only if we read 'undefined' registers. */ | |
558 | i = inb_p(address + 1); | |
559 | if (inb_p(address + 2) != i) { | |
560 | err = -ENODEV; | |
561 | goto ERROR1; | |
562 | } | |
563 | if (inb_p(address + 3) != i) { | |
564 | err = -ENODEV; | |
565 | goto ERROR1; | |
566 | } | |
567 | if (inb_p(address + 7) != i) { | |
568 | err = -ENODEV; | |
569 | goto ERROR1; | |
570 | } | |
571 | #undef REALLY_SLOW_IO | |
572 | ||
573 | /* Let's just hope nothing breaks here */ | |
574 | i = inb_p(address + 5) & 0x7f; | |
575 | outb_p(~i & 0x7f, address + 5); | |
576 | if ((inb_p(address + 5) & 0x7f) != (~i & 0x7f)) { | |
577 | outb_p(i, address + 5); | |
578 | err = -ENODEV; | |
579 | goto ERROR1; | |
580 | } | |
581 | } | |
582 | } | |
583 | ||
584 | /* OK. For now, we presume we have a valid client. We now create the | |
585 | client structure, even though we cannot fill it completely yet. | |
586 | But it allows us to access lm78_{read,write}_value. */ | |
587 | ||
ba9c2e8d | 588 | if (!(data = kzalloc(sizeof(struct lm78_data), GFP_KERNEL))) { |
1da177e4 LT |
589 | err = -ENOMEM; |
590 | goto ERROR1; | |
591 | } | |
1da177e4 LT |
592 | |
593 | new_client = &data->client; | |
594 | if (is_isa) | |
9a61bf63 | 595 | mutex_init(&data->lock); |
1da177e4 LT |
596 | i2c_set_clientdata(new_client, data); |
597 | new_client->addr = address; | |
598 | new_client->adapter = adapter; | |
fde09509 | 599 | new_client->driver = is_isa ? &lm78_isa_driver : &lm78_driver; |
1da177e4 LT |
600 | new_client->flags = 0; |
601 | ||
602 | /* Now, we do the remaining detection. */ | |
603 | if (kind < 0) { | |
604 | if (lm78_read_value(new_client, LM78_REG_CONFIG) & 0x80) { | |
605 | err = -ENODEV; | |
606 | goto ERROR2; | |
607 | } | |
608 | if (!is_isa && (lm78_read_value( | |
609 | new_client, LM78_REG_I2C_ADDR) != address)) { | |
610 | err = -ENODEV; | |
611 | goto ERROR2; | |
612 | } | |
613 | } | |
614 | ||
615 | /* Determine the chip type. */ | |
616 | if (kind <= 0) { | |
617 | i = lm78_read_value(new_client, LM78_REG_CHIPID); | |
27fe048e JD |
618 | if (i == 0x00 || i == 0x20 /* LM78 */ |
619 | || i == 0x40) /* LM78-J */ | |
1da177e4 | 620 | kind = lm78; |
1da177e4 LT |
621 | else if ((i & 0xfe) == 0xc0) |
622 | kind = lm79; | |
623 | else { | |
624 | if (kind == 0) | |
625 | dev_warn(&adapter->dev, "Ignoring 'force' " | |
626 | "parameter for unknown chip at " | |
627 | "adapter %d, address 0x%02x\n", | |
628 | i2c_adapter_id(adapter), address); | |
629 | err = -ENODEV; | |
630 | goto ERROR2; | |
631 | } | |
632 | } | |
633 | ||
634 | if (kind == lm78) { | |
635 | client_name = "lm78"; | |
1da177e4 LT |
636 | } else if (kind == lm79) { |
637 | client_name = "lm79"; | |
638 | } | |
639 | ||
640 | /* Fill in the remaining client fields and put into the global list */ | |
641 | strlcpy(new_client->name, client_name, I2C_NAME_SIZE); | |
642 | data->type = kind; | |
643 | ||
644 | data->valid = 0; | |
9a61bf63 | 645 | mutex_init(&data->update_lock); |
1da177e4 LT |
646 | |
647 | /* Tell the I2C layer a new client has arrived */ | |
648 | if ((err = i2c_attach_client(new_client))) | |
649 | goto ERROR2; | |
650 | ||
651 | /* Initialize the LM78 chip */ | |
652 | lm78_init_client(new_client); | |
653 | ||
654 | /* A few vars need to be filled upon startup */ | |
655 | for (i = 0; i < 3; i++) { | |
656 | data->fan_min[i] = lm78_read_value(new_client, | |
657 | LM78_REG_FAN_MIN(i)); | |
658 | } | |
659 | ||
660 | /* Register sysfs hooks */ | |
c1685f61 MH |
661 | if ((err = sysfs_create_group(&new_client->dev.kobj, &lm78_group))) |
662 | goto ERROR3; | |
663 | ||
943b0830 MH |
664 | data->class_dev = hwmon_device_register(&new_client->dev); |
665 | if (IS_ERR(data->class_dev)) { | |
666 | err = PTR_ERR(data->class_dev); | |
c1685f61 | 667 | goto ERROR4; |
943b0830 MH |
668 | } |
669 | ||
1da177e4 LT |
670 | return 0; |
671 | ||
c1685f61 MH |
672 | ERROR4: |
673 | sysfs_remove_group(&new_client->dev.kobj, &lm78_group); | |
943b0830 MH |
674 | ERROR3: |
675 | i2c_detach_client(new_client); | |
1da177e4 LT |
676 | ERROR2: |
677 | kfree(data); | |
678 | ERROR1: | |
679 | if (is_isa) | |
680 | release_region(address, LM78_EXTENT); | |
681 | ERROR0: | |
682 | return err; | |
683 | } | |
684 | ||
685 | static int lm78_detach_client(struct i2c_client *client) | |
686 | { | |
943b0830 | 687 | struct lm78_data *data = i2c_get_clientdata(client); |
1da177e4 LT |
688 | int err; |
689 | ||
943b0830 | 690 | hwmon_device_unregister(data->class_dev); |
c1685f61 | 691 | sysfs_remove_group(&client->dev.kobj, &lm78_group); |
943b0830 | 692 | |
7bef5594 | 693 | if ((err = i2c_detach_client(client))) |
1da177e4 | 694 | return err; |
1da177e4 LT |
695 | |
696 | if(i2c_is_isa_client(client)) | |
697 | release_region(client->addr, LM78_EXTENT); | |
698 | ||
943b0830 | 699 | kfree(data); |
1da177e4 LT |
700 | |
701 | return 0; | |
702 | } | |
703 | ||
44bbe87e | 704 | /* The SMBus locks itself, but ISA access must be locked explicitly! |
1da177e4 LT |
705 | We don't want to lock the whole ISA bus, so we lock each client |
706 | separately. | |
707 | We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks, | |
708 | would slow down the LM78 access and should not be necessary. */ | |
709 | static int lm78_read_value(struct i2c_client *client, u8 reg) | |
710 | { | |
711 | int res; | |
712 | if (i2c_is_isa_client(client)) { | |
713 | struct lm78_data *data = i2c_get_clientdata(client); | |
9a61bf63 | 714 | mutex_lock(&data->lock); |
1da177e4 LT |
715 | outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET); |
716 | res = inb_p(client->addr + LM78_DATA_REG_OFFSET); | |
9a61bf63 | 717 | mutex_unlock(&data->lock); |
1da177e4 LT |
718 | return res; |
719 | } else | |
720 | return i2c_smbus_read_byte_data(client, reg); | |
721 | } | |
722 | ||
44bbe87e | 723 | /* The SMBus locks itself, but ISA access muse be locked explicitly! |
1da177e4 LT |
724 | We don't want to lock the whole ISA bus, so we lock each client |
725 | separately. | |
726 | We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks, | |
727 | would slow down the LM78 access and should not be necessary. | |
728 | There are some ugly typecasts here, but the good new is - they should | |
729 | nowhere else be necessary! */ | |
730 | static int lm78_write_value(struct i2c_client *client, u8 reg, u8 value) | |
731 | { | |
732 | if (i2c_is_isa_client(client)) { | |
733 | struct lm78_data *data = i2c_get_clientdata(client); | |
9a61bf63 | 734 | mutex_lock(&data->lock); |
1da177e4 LT |
735 | outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET); |
736 | outb_p(value, client->addr + LM78_DATA_REG_OFFSET); | |
9a61bf63 | 737 | mutex_unlock(&data->lock); |
1da177e4 LT |
738 | return 0; |
739 | } else | |
740 | return i2c_smbus_write_byte_data(client, reg, value); | |
741 | } | |
742 | ||
1da177e4 LT |
743 | static void lm78_init_client(struct i2c_client *client) |
744 | { | |
745 | u8 config = lm78_read_value(client, LM78_REG_CONFIG); | |
746 | ||
747 | /* Start monitoring */ | |
748 | if (!(config & 0x01)) | |
749 | lm78_write_value(client, LM78_REG_CONFIG, | |
750 | (config & 0xf7) | 0x01); | |
751 | } | |
752 | ||
753 | static struct lm78_data *lm78_update_device(struct device *dev) | |
754 | { | |
755 | struct i2c_client *client = to_i2c_client(dev); | |
756 | struct lm78_data *data = i2c_get_clientdata(client); | |
757 | int i; | |
758 | ||
9a61bf63 | 759 | mutex_lock(&data->update_lock); |
1da177e4 LT |
760 | |
761 | if (time_after(jiffies, data->last_updated + HZ + HZ / 2) | |
762 | || !data->valid) { | |
763 | ||
764 | dev_dbg(&client->dev, "Starting lm78 update\n"); | |
765 | ||
766 | for (i = 0; i <= 6; i++) { | |
767 | data->in[i] = | |
768 | lm78_read_value(client, LM78_REG_IN(i)); | |
769 | data->in_min[i] = | |
770 | lm78_read_value(client, LM78_REG_IN_MIN(i)); | |
771 | data->in_max[i] = | |
772 | lm78_read_value(client, LM78_REG_IN_MAX(i)); | |
773 | } | |
774 | for (i = 0; i < 3; i++) { | |
775 | data->fan[i] = | |
776 | lm78_read_value(client, LM78_REG_FAN(i)); | |
777 | data->fan_min[i] = | |
778 | lm78_read_value(client, LM78_REG_FAN_MIN(i)); | |
779 | } | |
780 | data->temp = lm78_read_value(client, LM78_REG_TEMP); | |
781 | data->temp_over = | |
782 | lm78_read_value(client, LM78_REG_TEMP_OVER); | |
783 | data->temp_hyst = | |
784 | lm78_read_value(client, LM78_REG_TEMP_HYST); | |
785 | i = lm78_read_value(client, LM78_REG_VID_FANDIV); | |
786 | data->vid = i & 0x0f; | |
787 | if (data->type == lm79) | |
788 | data->vid |= | |
789 | (lm78_read_value(client, LM78_REG_CHIPID) & | |
790 | 0x01) << 4; | |
791 | else | |
792 | data->vid |= 0x10; | |
793 | data->fan_div[0] = (i >> 4) & 0x03; | |
794 | data->fan_div[1] = i >> 6; | |
795 | data->alarms = lm78_read_value(client, LM78_REG_ALARM1) + | |
796 | (lm78_read_value(client, LM78_REG_ALARM2) << 8); | |
797 | data->last_updated = jiffies; | |
798 | data->valid = 1; | |
799 | ||
800 | data->fan_div[2] = 1; | |
801 | } | |
802 | ||
9a61bf63 | 803 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
804 | |
805 | return data; | |
806 | } | |
807 | ||
808 | static int __init sm_lm78_init(void) | |
809 | { | |
fde09509 JD |
810 | int res; |
811 | ||
812 | res = i2c_add_driver(&lm78_driver); | |
813 | if (res) | |
814 | return res; | |
815 | ||
e693810c JD |
816 | /* Don't exit if this one fails, we still want the I2C variants |
817 | to work! */ | |
818 | if (i2c_isa_add_driver(&lm78_isa_driver)) | |
819 | isa_address = 0; | |
fde09509 JD |
820 | |
821 | return 0; | |
1da177e4 LT |
822 | } |
823 | ||
824 | static void __exit sm_lm78_exit(void) | |
825 | { | |
e693810c JD |
826 | if (isa_address) |
827 | i2c_isa_del_driver(&lm78_isa_driver); | |
1da177e4 LT |
828 | i2c_del_driver(&lm78_driver); |
829 | } | |
830 | ||
831 | ||
832 | ||
833 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>"); | |
27fe048e | 834 | MODULE_DESCRIPTION("LM78/LM79 driver"); |
1da177e4 LT |
835 | MODULE_LICENSE("GPL"); |
836 | ||
837 | module_init(sm_lm78_init); | |
838 | module_exit(sm_lm78_exit); |