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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 MH |
27 | #include <linux/hwmon.h> |
28 | #include <linux/err.h> | |
1da177e4 LT |
29 | #include <asm/io.h> |
30 | ||
31 | /* Addresses to scan */ | |
32 | static unsigned short normal_i2c[] = { 0x20, 0x21, 0x22, 0x23, 0x24, | |
33 | 0x25, 0x26, 0x27, 0x28, 0x29, | |
34 | 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, | |
35 | 0x2f, I2C_CLIENT_END }; | |
2d8672c5 | 36 | static unsigned short isa_address = 0x290; |
1da177e4 LT |
37 | |
38 | /* Insmod parameters */ | |
f4b50261 | 39 | I2C_CLIENT_INSMOD_2(lm78, lm79); |
1da177e4 LT |
40 | |
41 | /* Many LM78 constants specified below */ | |
42 | ||
43 | /* Length of ISA address segment */ | |
44 | #define LM78_EXTENT 8 | |
45 | ||
46 | /* Where are the ISA address/data registers relative to the base address */ | |
47 | #define LM78_ADDR_REG_OFFSET 5 | |
48 | #define LM78_DATA_REG_OFFSET 6 | |
49 | ||
50 | /* The LM78 registers */ | |
51 | #define LM78_REG_IN_MAX(nr) (0x2b + (nr) * 2) | |
52 | #define LM78_REG_IN_MIN(nr) (0x2c + (nr) * 2) | |
53 | #define LM78_REG_IN(nr) (0x20 + (nr)) | |
54 | ||
55 | #define LM78_REG_FAN_MIN(nr) (0x3b + (nr)) | |
56 | #define LM78_REG_FAN(nr) (0x28 + (nr)) | |
57 | ||
58 | #define LM78_REG_TEMP 0x27 | |
59 | #define LM78_REG_TEMP_OVER 0x39 | |
60 | #define LM78_REG_TEMP_HYST 0x3a | |
61 | ||
62 | #define LM78_REG_ALARM1 0x41 | |
63 | #define LM78_REG_ALARM2 0x42 | |
64 | ||
65 | #define LM78_REG_VID_FANDIV 0x47 | |
66 | ||
67 | #define LM78_REG_CONFIG 0x40 | |
68 | #define LM78_REG_CHIPID 0x49 | |
69 | #define LM78_REG_I2C_ADDR 0x48 | |
70 | ||
71 | ||
72 | /* Conversions. Rounding and limit checking is only done on the TO_REG | |
73 | variants. */ | |
74 | ||
75 | /* IN: mV, (0V to 4.08V) | |
76 | REG: 16mV/bit */ | |
77 | static inline u8 IN_TO_REG(unsigned long val) | |
78 | { | |
79 | unsigned long nval = SENSORS_LIMIT(val, 0, 4080); | |
80 | return (nval + 8) / 16; | |
81 | } | |
82 | #define IN_FROM_REG(val) ((val) * 16) | |
83 | ||
84 | static inline u8 FAN_TO_REG(long rpm, int div) | |
85 | { | |
86 | if (rpm <= 0) | |
87 | return 255; | |
88 | return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 254); | |
89 | } | |
90 | ||
91 | static inline int FAN_FROM_REG(u8 val, int div) | |
92 | { | |
93 | return val==0 ? -1 : val==255 ? 0 : 1350000/(val*div); | |
94 | } | |
95 | ||
96 | /* TEMP: mC (-128C to +127C) | |
97 | REG: 1C/bit, two's complement */ | |
98 | static inline s8 TEMP_TO_REG(int val) | |
99 | { | |
100 | int nval = SENSORS_LIMIT(val, -128000, 127000) ; | |
101 | return nval<0 ? (nval-500)/1000 : (nval+500)/1000; | |
102 | } | |
103 | ||
104 | static inline int TEMP_FROM_REG(s8 val) | |
105 | { | |
106 | return val * 1000; | |
107 | } | |
108 | ||
109 | /* VID: mV | |
110 | REG: (see doc/vid) */ | |
111 | static inline int VID_FROM_REG(u8 val) | |
112 | { | |
113 | return val==0x1f ? 0 : val>=0x10 ? 5100-val*100 : 2050-val*50; | |
114 | } | |
115 | ||
116 | #define DIV_FROM_REG(val) (1 << (val)) | |
117 | ||
118 | /* There are some complications in a module like this. First off, LM78 chips | |
119 | may be both present on the SMBus and the ISA bus, and we have to handle | |
120 | those cases separately at some places. Second, there might be several | |
121 | LM78 chips available (well, actually, that is probably never done; but | |
122 | it is a clean illustration of how to handle a case like that). Finally, | |
123 | a specific chip may be attached to *both* ISA and SMBus, and we would | |
124 | not like to detect it double. Fortunately, in the case of the LM78 at | |
125 | least, a register tells us what SMBus address we are on, so that helps | |
126 | a bit - except if there could be more than one SMBus. Groan. No solution | |
127 | for this yet. */ | |
128 | ||
129 | /* This module may seem overly long and complicated. In fact, it is not so | |
130 | bad. Quite a lot of bookkeeping is done. A real driver can often cut | |
131 | some corners. */ | |
132 | ||
133 | /* For each registered LM78, we need to keep some data in memory. That | |
134 | data is pointed to by lm78_list[NR]->data. The structure itself is | |
135 | dynamically allocated, at the same time when a new lm78 client is | |
136 | allocated. */ | |
137 | struct lm78_data { | |
138 | struct i2c_client client; | |
943b0830 | 139 | struct class_device *class_dev; |
1da177e4 LT |
140 | struct semaphore lock; |
141 | enum chips type; | |
142 | ||
143 | struct semaphore update_lock; | |
144 | char valid; /* !=0 if following fields are valid */ | |
145 | unsigned long last_updated; /* In jiffies */ | |
146 | ||
147 | u8 in[7]; /* Register value */ | |
148 | u8 in_max[7]; /* Register value */ | |
149 | u8 in_min[7]; /* Register value */ | |
150 | u8 fan[3]; /* Register value */ | |
151 | u8 fan_min[3]; /* Register value */ | |
152 | s8 temp; /* Register value */ | |
153 | s8 temp_over; /* Register value */ | |
154 | s8 temp_hyst; /* Register value */ | |
155 | u8 fan_div[3]; /* Register encoding, shifted right */ | |
156 | u8 vid; /* Register encoding, combined */ | |
157 | u16 alarms; /* Register encoding, combined */ | |
158 | }; | |
159 | ||
160 | ||
161 | static int lm78_attach_adapter(struct i2c_adapter *adapter); | |
2d8672c5 | 162 | static int lm78_isa_attach_adapter(struct i2c_adapter *adapter); |
1da177e4 LT |
163 | static int lm78_detect(struct i2c_adapter *adapter, int address, int kind); |
164 | static int lm78_detach_client(struct i2c_client *client); | |
165 | ||
166 | static int lm78_read_value(struct i2c_client *client, u8 register); | |
167 | static int lm78_write_value(struct i2c_client *client, u8 register, u8 value); | |
168 | static struct lm78_data *lm78_update_device(struct device *dev); | |
169 | static void lm78_init_client(struct i2c_client *client); | |
170 | ||
171 | ||
172 | static struct i2c_driver lm78_driver = { | |
173 | .owner = THIS_MODULE, | |
174 | .name = "lm78", | |
175 | .id = I2C_DRIVERID_LM78, | |
176 | .flags = I2C_DF_NOTIFY, | |
177 | .attach_adapter = lm78_attach_adapter, | |
178 | .detach_client = lm78_detach_client, | |
179 | }; | |
180 | ||
fde09509 JD |
181 | static struct i2c_driver lm78_isa_driver = { |
182 | .owner = THIS_MODULE, | |
183 | .name = "lm78-isa", | |
2d8672c5 | 184 | .attach_adapter = lm78_isa_attach_adapter, |
fde09509 JD |
185 | .detach_client = lm78_detach_client, |
186 | }; | |
187 | ||
188 | ||
1da177e4 LT |
189 | /* 7 Voltages */ |
190 | static ssize_t show_in(struct device *dev, char *buf, int nr) | |
191 | { | |
192 | struct lm78_data *data = lm78_update_device(dev); | |
193 | return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr])); | |
194 | } | |
195 | ||
196 | static ssize_t show_in_min(struct device *dev, char *buf, int nr) | |
197 | { | |
198 | struct lm78_data *data = lm78_update_device(dev); | |
199 | return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr])); | |
200 | } | |
201 | ||
202 | static ssize_t show_in_max(struct device *dev, char *buf, int nr) | |
203 | { | |
204 | struct lm78_data *data = lm78_update_device(dev); | |
205 | return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr])); | |
206 | } | |
207 | ||
208 | static ssize_t set_in_min(struct device *dev, const char *buf, | |
209 | size_t count, int nr) | |
210 | { | |
211 | struct i2c_client *client = to_i2c_client(dev); | |
212 | struct lm78_data *data = i2c_get_clientdata(client); | |
213 | unsigned long val = simple_strtoul(buf, NULL, 10); | |
214 | ||
215 | down(&data->update_lock); | |
216 | data->in_min[nr] = IN_TO_REG(val); | |
217 | lm78_write_value(client, LM78_REG_IN_MIN(nr), data->in_min[nr]); | |
218 | up(&data->update_lock); | |
219 | return count; | |
220 | } | |
221 | ||
222 | static ssize_t set_in_max(struct device *dev, const char *buf, | |
223 | size_t count, int nr) | |
224 | { | |
225 | struct i2c_client *client = to_i2c_client(dev); | |
226 | struct lm78_data *data = i2c_get_clientdata(client); | |
227 | unsigned long val = simple_strtoul(buf, NULL, 10); | |
228 | ||
229 | down(&data->update_lock); | |
230 | data->in_max[nr] = IN_TO_REG(val); | |
231 | lm78_write_value(client, LM78_REG_IN_MAX(nr), data->in_max[nr]); | |
232 | up(&data->update_lock); | |
233 | return count; | |
234 | } | |
235 | ||
236 | #define show_in_offset(offset) \ | |
237 | static ssize_t \ | |
8627f9ba | 238 | show_in##offset (struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
239 | { \ |
240 | return show_in(dev, buf, offset); \ | |
241 | } \ | |
242 | static DEVICE_ATTR(in##offset##_input, S_IRUGO, \ | |
243 | show_in##offset, NULL); \ | |
244 | static ssize_t \ | |
8627f9ba | 245 | show_in##offset##_min (struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
246 | { \ |
247 | return show_in_min(dev, buf, offset); \ | |
248 | } \ | |
249 | static ssize_t \ | |
8627f9ba | 250 | show_in##offset##_max (struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
251 | { \ |
252 | return show_in_max(dev, buf, offset); \ | |
253 | } \ | |
8627f9ba | 254 | static ssize_t set_in##offset##_min (struct device *dev, struct device_attribute *attr, \ |
1da177e4 LT |
255 | const char *buf, size_t count) \ |
256 | { \ | |
257 | return set_in_min(dev, buf, count, offset); \ | |
258 | } \ | |
8627f9ba | 259 | static ssize_t set_in##offset##_max (struct device *dev, struct device_attribute *attr, \ |
1da177e4 LT |
260 | const char *buf, size_t count) \ |
261 | { \ | |
262 | return set_in_max(dev, buf, count, offset); \ | |
263 | } \ | |
264 | static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \ | |
265 | show_in##offset##_min, set_in##offset##_min); \ | |
266 | static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \ | |
267 | show_in##offset##_max, set_in##offset##_max); | |
268 | ||
269 | show_in_offset(0); | |
270 | show_in_offset(1); | |
271 | show_in_offset(2); | |
272 | show_in_offset(3); | |
273 | show_in_offset(4); | |
274 | show_in_offset(5); | |
275 | show_in_offset(6); | |
276 | ||
277 | /* Temperature */ | |
8627f9ba | 278 | static ssize_t show_temp(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
279 | { |
280 | struct lm78_data *data = lm78_update_device(dev); | |
281 | return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp)); | |
282 | } | |
283 | ||
8627f9ba | 284 | static ssize_t show_temp_over(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
285 | { |
286 | struct lm78_data *data = lm78_update_device(dev); | |
287 | return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_over)); | |
288 | } | |
289 | ||
8627f9ba | 290 | static ssize_t set_temp_over(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
291 | { |
292 | struct i2c_client *client = to_i2c_client(dev); | |
293 | struct lm78_data *data = i2c_get_clientdata(client); | |
294 | long val = simple_strtol(buf, NULL, 10); | |
295 | ||
296 | down(&data->update_lock); | |
297 | data->temp_over = TEMP_TO_REG(val); | |
298 | lm78_write_value(client, LM78_REG_TEMP_OVER, data->temp_over); | |
299 | up(&data->update_lock); | |
300 | return count; | |
301 | } | |
302 | ||
8627f9ba | 303 | static ssize_t show_temp_hyst(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
304 | { |
305 | struct lm78_data *data = lm78_update_device(dev); | |
306 | return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_hyst)); | |
307 | } | |
308 | ||
8627f9ba | 309 | static ssize_t set_temp_hyst(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
310 | { |
311 | struct i2c_client *client = to_i2c_client(dev); | |
312 | struct lm78_data *data = i2c_get_clientdata(client); | |
313 | long val = simple_strtol(buf, NULL, 10); | |
314 | ||
315 | down(&data->update_lock); | |
316 | data->temp_hyst = TEMP_TO_REG(val); | |
317 | lm78_write_value(client, LM78_REG_TEMP_HYST, data->temp_hyst); | |
318 | up(&data->update_lock); | |
319 | return count; | |
320 | } | |
321 | ||
322 | static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL); | |
323 | static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, | |
324 | show_temp_over, set_temp_over); | |
325 | static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR, | |
326 | show_temp_hyst, set_temp_hyst); | |
327 | ||
328 | /* 3 Fans */ | |
329 | static ssize_t show_fan(struct device *dev, char *buf, int nr) | |
330 | { | |
331 | struct lm78_data *data = lm78_update_device(dev); | |
332 | return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr], | |
333 | DIV_FROM_REG(data->fan_div[nr])) ); | |
334 | } | |
335 | ||
336 | static ssize_t show_fan_min(struct device *dev, char *buf, int nr) | |
337 | { | |
338 | struct lm78_data *data = lm78_update_device(dev); | |
339 | return sprintf(buf,"%d\n", FAN_FROM_REG(data->fan_min[nr], | |
340 | DIV_FROM_REG(data->fan_div[nr])) ); | |
341 | } | |
342 | ||
343 | static ssize_t set_fan_min(struct device *dev, const char *buf, | |
344 | size_t count, int nr) | |
345 | { | |
346 | struct i2c_client *client = to_i2c_client(dev); | |
347 | struct lm78_data *data = i2c_get_clientdata(client); | |
348 | unsigned long val = simple_strtoul(buf, NULL, 10); | |
349 | ||
350 | down(&data->update_lock); | |
351 | data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr])); | |
352 | lm78_write_value(client, LM78_REG_FAN_MIN(nr), data->fan_min[nr]); | |
353 | up(&data->update_lock); | |
354 | return count; | |
355 | } | |
356 | ||
357 | static ssize_t show_fan_div(struct device *dev, char *buf, int nr) | |
358 | { | |
359 | struct lm78_data *data = lm78_update_device(dev); | |
360 | return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]) ); | |
361 | } | |
362 | ||
363 | /* Note: we save and restore the fan minimum here, because its value is | |
364 | determined in part by the fan divisor. This follows the principle of | |
365 | least suprise; the user doesn't expect the fan minimum to change just | |
366 | because the divisor changed. */ | |
367 | static ssize_t set_fan_div(struct device *dev, const char *buf, | |
368 | size_t count, int nr) | |
369 | { | |
370 | struct i2c_client *client = to_i2c_client(dev); | |
371 | struct lm78_data *data = i2c_get_clientdata(client); | |
372 | unsigned long val = simple_strtoul(buf, NULL, 10); | |
373 | unsigned long min; | |
374 | u8 reg; | |
375 | ||
376 | down(&data->update_lock); | |
377 | min = FAN_FROM_REG(data->fan_min[nr], | |
378 | DIV_FROM_REG(data->fan_div[nr])); | |
379 | ||
380 | switch (val) { | |
381 | case 1: data->fan_div[nr] = 0; break; | |
382 | case 2: data->fan_div[nr] = 1; break; | |
383 | case 4: data->fan_div[nr] = 2; break; | |
384 | case 8: data->fan_div[nr] = 3; break; | |
385 | default: | |
386 | dev_err(&client->dev, "fan_div value %ld not " | |
387 | "supported. Choose one of 1, 2, 4 or 8!\n", val); | |
388 | up(&data->update_lock); | |
389 | return -EINVAL; | |
390 | } | |
391 | ||
392 | reg = lm78_read_value(client, LM78_REG_VID_FANDIV); | |
393 | switch (nr) { | |
394 | case 0: | |
395 | reg = (reg & 0xcf) | (data->fan_div[nr] << 4); | |
396 | break; | |
397 | case 1: | |
398 | reg = (reg & 0x3f) | (data->fan_div[nr] << 6); | |
399 | break; | |
400 | } | |
401 | lm78_write_value(client, LM78_REG_VID_FANDIV, reg); | |
402 | ||
403 | data->fan_min[nr] = | |
404 | FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr])); | |
405 | lm78_write_value(client, LM78_REG_FAN_MIN(nr), data->fan_min[nr]); | |
406 | up(&data->update_lock); | |
407 | ||
408 | return count; | |
409 | } | |
410 | ||
411 | #define show_fan_offset(offset) \ | |
8627f9ba | 412 | static ssize_t show_fan_##offset (struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
413 | { \ |
414 | return show_fan(dev, buf, offset - 1); \ | |
415 | } \ | |
8627f9ba | 416 | static ssize_t show_fan_##offset##_min (struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
417 | { \ |
418 | return show_fan_min(dev, buf, offset - 1); \ | |
419 | } \ | |
8627f9ba | 420 | static ssize_t show_fan_##offset##_div (struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
421 | { \ |
422 | return show_fan_div(dev, buf, offset - 1); \ | |
423 | } \ | |
8627f9ba | 424 | static ssize_t set_fan_##offset##_min (struct device *dev, struct device_attribute *attr, \ |
1da177e4 LT |
425 | const char *buf, size_t count) \ |
426 | { \ | |
427 | return set_fan_min(dev, buf, count, offset - 1); \ | |
428 | } \ | |
429 | static DEVICE_ATTR(fan##offset##_input, S_IRUGO, show_fan_##offset, NULL);\ | |
430 | static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \ | |
431 | show_fan_##offset##_min, set_fan_##offset##_min); | |
432 | ||
8627f9ba | 433 | static ssize_t set_fan_1_div(struct device *dev, struct device_attribute *attr, const char *buf, |
1da177e4 LT |
434 | size_t count) |
435 | { | |
436 | return set_fan_div(dev, buf, count, 0) ; | |
437 | } | |
438 | ||
8627f9ba | 439 | static ssize_t set_fan_2_div(struct device *dev, struct device_attribute *attr, const char *buf, |
1da177e4 LT |
440 | size_t count) |
441 | { | |
442 | return set_fan_div(dev, buf, count, 1) ; | |
443 | } | |
444 | ||
445 | show_fan_offset(1); | |
446 | show_fan_offset(2); | |
447 | show_fan_offset(3); | |
448 | ||
449 | /* Fan 3 divisor is locked in H/W */ | |
450 | static DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR, | |
451 | show_fan_1_div, set_fan_1_div); | |
452 | static DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR, | |
453 | show_fan_2_div, set_fan_2_div); | |
454 | static DEVICE_ATTR(fan3_div, S_IRUGO, show_fan_3_div, NULL); | |
455 | ||
456 | /* VID */ | |
8627f9ba | 457 | static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
458 | { |
459 | struct lm78_data *data = lm78_update_device(dev); | |
460 | return sprintf(buf, "%d\n", VID_FROM_REG(data->vid)); | |
461 | } | |
462 | static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL); | |
463 | ||
464 | /* Alarms */ | |
8627f9ba | 465 | static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
466 | { |
467 | struct lm78_data *data = lm78_update_device(dev); | |
468 | return sprintf(buf, "%u\n", data->alarms); | |
469 | } | |
470 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); | |
471 | ||
472 | /* This function is called when: | |
473 | * lm78_driver is inserted (when this module is loaded), for each | |
474 | available adapter | |
475 | * when a new adapter is inserted (and lm78_driver is still present) */ | |
476 | static int lm78_attach_adapter(struct i2c_adapter *adapter) | |
477 | { | |
478 | if (!(adapter->class & I2C_CLASS_HWMON)) | |
479 | return 0; | |
2ed2dc3c | 480 | return i2c_probe(adapter, &addr_data, lm78_detect); |
1da177e4 LT |
481 | } |
482 | ||
2d8672c5 JD |
483 | static int lm78_isa_attach_adapter(struct i2c_adapter *adapter) |
484 | { | |
485 | return lm78_detect(adapter, isa_address, -1); | |
486 | } | |
487 | ||
2ed2dc3c | 488 | /* This function is called by i2c_probe */ |
1da177e4 LT |
489 | int lm78_detect(struct i2c_adapter *adapter, int address, int kind) |
490 | { | |
491 | int i, err; | |
492 | struct i2c_client *new_client; | |
493 | struct lm78_data *data; | |
494 | const char *client_name = ""; | |
495 | int is_isa = i2c_is_isa_adapter(adapter); | |
496 | ||
497 | if (!is_isa && | |
498 | !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { | |
499 | err = -ENODEV; | |
500 | goto ERROR0; | |
501 | } | |
502 | ||
503 | /* Reserve the ISA region */ | |
504 | if (is_isa) | |
fde09509 JD |
505 | if (!request_region(address, LM78_EXTENT, |
506 | lm78_isa_driver.name)) { | |
1da177e4 LT |
507 | err = -EBUSY; |
508 | goto ERROR0; | |
509 | } | |
510 | ||
511 | /* Probe whether there is anything available on this address. Already | |
512 | done for SMBus clients */ | |
513 | if (kind < 0) { | |
514 | if (is_isa) { | |
515 | ||
516 | #define REALLY_SLOW_IO | |
517 | /* We need the timeouts for at least some LM78-like | |
518 | chips. But only if we read 'undefined' registers. */ | |
519 | i = inb_p(address + 1); | |
520 | if (inb_p(address + 2) != i) { | |
521 | err = -ENODEV; | |
522 | goto ERROR1; | |
523 | } | |
524 | if (inb_p(address + 3) != i) { | |
525 | err = -ENODEV; | |
526 | goto ERROR1; | |
527 | } | |
528 | if (inb_p(address + 7) != i) { | |
529 | err = -ENODEV; | |
530 | goto ERROR1; | |
531 | } | |
532 | #undef REALLY_SLOW_IO | |
533 | ||
534 | /* Let's just hope nothing breaks here */ | |
535 | i = inb_p(address + 5) & 0x7f; | |
536 | outb_p(~i & 0x7f, address + 5); | |
537 | if ((inb_p(address + 5) & 0x7f) != (~i & 0x7f)) { | |
538 | outb_p(i, address + 5); | |
539 | err = -ENODEV; | |
540 | goto ERROR1; | |
541 | } | |
542 | } | |
543 | } | |
544 | ||
545 | /* OK. For now, we presume we have a valid client. We now create the | |
546 | client structure, even though we cannot fill it completely yet. | |
547 | But it allows us to access lm78_{read,write}_value. */ | |
548 | ||
549 | if (!(data = kmalloc(sizeof(struct lm78_data), GFP_KERNEL))) { | |
550 | err = -ENOMEM; | |
551 | goto ERROR1; | |
552 | } | |
553 | memset(data, 0, sizeof(struct lm78_data)); | |
554 | ||
555 | new_client = &data->client; | |
556 | if (is_isa) | |
557 | init_MUTEX(&data->lock); | |
558 | i2c_set_clientdata(new_client, data); | |
559 | new_client->addr = address; | |
560 | new_client->adapter = adapter; | |
fde09509 | 561 | new_client->driver = is_isa ? &lm78_isa_driver : &lm78_driver; |
1da177e4 LT |
562 | new_client->flags = 0; |
563 | ||
564 | /* Now, we do the remaining detection. */ | |
565 | if (kind < 0) { | |
566 | if (lm78_read_value(new_client, LM78_REG_CONFIG) & 0x80) { | |
567 | err = -ENODEV; | |
568 | goto ERROR2; | |
569 | } | |
570 | if (!is_isa && (lm78_read_value( | |
571 | new_client, LM78_REG_I2C_ADDR) != address)) { | |
572 | err = -ENODEV; | |
573 | goto ERROR2; | |
574 | } | |
575 | } | |
576 | ||
577 | /* Determine the chip type. */ | |
578 | if (kind <= 0) { | |
579 | i = lm78_read_value(new_client, LM78_REG_CHIPID); | |
27fe048e JD |
580 | if (i == 0x00 || i == 0x20 /* LM78 */ |
581 | || i == 0x40) /* LM78-J */ | |
1da177e4 | 582 | kind = lm78; |
1da177e4 LT |
583 | else if ((i & 0xfe) == 0xc0) |
584 | kind = lm79; | |
585 | else { | |
586 | if (kind == 0) | |
587 | dev_warn(&adapter->dev, "Ignoring 'force' " | |
588 | "parameter for unknown chip at " | |
589 | "adapter %d, address 0x%02x\n", | |
590 | i2c_adapter_id(adapter), address); | |
591 | err = -ENODEV; | |
592 | goto ERROR2; | |
593 | } | |
594 | } | |
595 | ||
596 | if (kind == lm78) { | |
597 | client_name = "lm78"; | |
1da177e4 LT |
598 | } else if (kind == lm79) { |
599 | client_name = "lm79"; | |
600 | } | |
601 | ||
602 | /* Fill in the remaining client fields and put into the global list */ | |
603 | strlcpy(new_client->name, client_name, I2C_NAME_SIZE); | |
604 | data->type = kind; | |
605 | ||
606 | data->valid = 0; | |
607 | init_MUTEX(&data->update_lock); | |
608 | ||
609 | /* Tell the I2C layer a new client has arrived */ | |
610 | if ((err = i2c_attach_client(new_client))) | |
611 | goto ERROR2; | |
612 | ||
613 | /* Initialize the LM78 chip */ | |
614 | lm78_init_client(new_client); | |
615 | ||
616 | /* A few vars need to be filled upon startup */ | |
617 | for (i = 0; i < 3; i++) { | |
618 | data->fan_min[i] = lm78_read_value(new_client, | |
619 | LM78_REG_FAN_MIN(i)); | |
620 | } | |
621 | ||
622 | /* Register sysfs hooks */ | |
943b0830 MH |
623 | data->class_dev = hwmon_device_register(&new_client->dev); |
624 | if (IS_ERR(data->class_dev)) { | |
625 | err = PTR_ERR(data->class_dev); | |
626 | goto ERROR3; | |
627 | } | |
628 | ||
1da177e4 LT |
629 | device_create_file(&new_client->dev, &dev_attr_in0_input); |
630 | device_create_file(&new_client->dev, &dev_attr_in0_min); | |
631 | device_create_file(&new_client->dev, &dev_attr_in0_max); | |
632 | device_create_file(&new_client->dev, &dev_attr_in1_input); | |
633 | device_create_file(&new_client->dev, &dev_attr_in1_min); | |
634 | device_create_file(&new_client->dev, &dev_attr_in1_max); | |
635 | device_create_file(&new_client->dev, &dev_attr_in2_input); | |
636 | device_create_file(&new_client->dev, &dev_attr_in2_min); | |
637 | device_create_file(&new_client->dev, &dev_attr_in2_max); | |
638 | device_create_file(&new_client->dev, &dev_attr_in3_input); | |
639 | device_create_file(&new_client->dev, &dev_attr_in3_min); | |
640 | device_create_file(&new_client->dev, &dev_attr_in3_max); | |
641 | device_create_file(&new_client->dev, &dev_attr_in4_input); | |
642 | device_create_file(&new_client->dev, &dev_attr_in4_min); | |
643 | device_create_file(&new_client->dev, &dev_attr_in4_max); | |
644 | device_create_file(&new_client->dev, &dev_attr_in5_input); | |
645 | device_create_file(&new_client->dev, &dev_attr_in5_min); | |
646 | device_create_file(&new_client->dev, &dev_attr_in5_max); | |
647 | device_create_file(&new_client->dev, &dev_attr_in6_input); | |
648 | device_create_file(&new_client->dev, &dev_attr_in6_min); | |
649 | device_create_file(&new_client->dev, &dev_attr_in6_max); | |
650 | device_create_file(&new_client->dev, &dev_attr_temp1_input); | |
651 | device_create_file(&new_client->dev, &dev_attr_temp1_max); | |
652 | device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst); | |
653 | device_create_file(&new_client->dev, &dev_attr_fan1_input); | |
654 | device_create_file(&new_client->dev, &dev_attr_fan1_min); | |
655 | device_create_file(&new_client->dev, &dev_attr_fan1_div); | |
656 | device_create_file(&new_client->dev, &dev_attr_fan2_input); | |
657 | device_create_file(&new_client->dev, &dev_attr_fan2_min); | |
658 | device_create_file(&new_client->dev, &dev_attr_fan2_div); | |
659 | device_create_file(&new_client->dev, &dev_attr_fan3_input); | |
660 | device_create_file(&new_client->dev, &dev_attr_fan3_min); | |
661 | device_create_file(&new_client->dev, &dev_attr_fan3_div); | |
662 | device_create_file(&new_client->dev, &dev_attr_alarms); | |
663 | device_create_file(&new_client->dev, &dev_attr_cpu0_vid); | |
664 | ||
665 | return 0; | |
666 | ||
943b0830 MH |
667 | ERROR3: |
668 | i2c_detach_client(new_client); | |
1da177e4 LT |
669 | ERROR2: |
670 | kfree(data); | |
671 | ERROR1: | |
672 | if (is_isa) | |
673 | release_region(address, LM78_EXTENT); | |
674 | ERROR0: | |
675 | return err; | |
676 | } | |
677 | ||
678 | static int lm78_detach_client(struct i2c_client *client) | |
679 | { | |
943b0830 | 680 | struct lm78_data *data = i2c_get_clientdata(client); |
1da177e4 LT |
681 | int err; |
682 | ||
943b0830 MH |
683 | hwmon_device_unregister(data->class_dev); |
684 | ||
7bef5594 | 685 | if ((err = i2c_detach_client(client))) |
1da177e4 | 686 | return err; |
1da177e4 LT |
687 | |
688 | if(i2c_is_isa_client(client)) | |
689 | release_region(client->addr, LM78_EXTENT); | |
690 | ||
943b0830 | 691 | kfree(data); |
1da177e4 LT |
692 | |
693 | return 0; | |
694 | } | |
695 | ||
44bbe87e | 696 | /* The SMBus locks itself, but ISA access must be locked explicitly! |
1da177e4 LT |
697 | We don't want to lock the whole ISA bus, so we lock each client |
698 | separately. | |
699 | We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks, | |
700 | would slow down the LM78 access and should not be necessary. */ | |
701 | static int lm78_read_value(struct i2c_client *client, u8 reg) | |
702 | { | |
703 | int res; | |
704 | if (i2c_is_isa_client(client)) { | |
705 | struct lm78_data *data = i2c_get_clientdata(client); | |
706 | down(&data->lock); | |
707 | outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET); | |
708 | res = inb_p(client->addr + LM78_DATA_REG_OFFSET); | |
709 | up(&data->lock); | |
710 | return res; | |
711 | } else | |
712 | return i2c_smbus_read_byte_data(client, reg); | |
713 | } | |
714 | ||
44bbe87e | 715 | /* The SMBus locks itself, but ISA access muse be locked explicitly! |
1da177e4 LT |
716 | We don't want to lock the whole ISA bus, so we lock each client |
717 | separately. | |
718 | We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks, | |
719 | would slow down the LM78 access and should not be necessary. | |
720 | There are some ugly typecasts here, but the good new is - they should | |
721 | nowhere else be necessary! */ | |
722 | static int lm78_write_value(struct i2c_client *client, u8 reg, u8 value) | |
723 | { | |
724 | if (i2c_is_isa_client(client)) { | |
725 | struct lm78_data *data = i2c_get_clientdata(client); | |
726 | down(&data->lock); | |
727 | outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET); | |
728 | outb_p(value, client->addr + LM78_DATA_REG_OFFSET); | |
729 | up(&data->lock); | |
730 | return 0; | |
731 | } else | |
732 | return i2c_smbus_write_byte_data(client, reg, value); | |
733 | } | |
734 | ||
735 | /* Called when we have found a new LM78. It should set limits, etc. */ | |
736 | static void lm78_init_client(struct i2c_client *client) | |
737 | { | |
738 | u8 config = lm78_read_value(client, LM78_REG_CONFIG); | |
739 | ||
740 | /* Start monitoring */ | |
741 | if (!(config & 0x01)) | |
742 | lm78_write_value(client, LM78_REG_CONFIG, | |
743 | (config & 0xf7) | 0x01); | |
744 | } | |
745 | ||
746 | static struct lm78_data *lm78_update_device(struct device *dev) | |
747 | { | |
748 | struct i2c_client *client = to_i2c_client(dev); | |
749 | struct lm78_data *data = i2c_get_clientdata(client); | |
750 | int i; | |
751 | ||
752 | down(&data->update_lock); | |
753 | ||
754 | if (time_after(jiffies, data->last_updated + HZ + HZ / 2) | |
755 | || !data->valid) { | |
756 | ||
757 | dev_dbg(&client->dev, "Starting lm78 update\n"); | |
758 | ||
759 | for (i = 0; i <= 6; i++) { | |
760 | data->in[i] = | |
761 | lm78_read_value(client, LM78_REG_IN(i)); | |
762 | data->in_min[i] = | |
763 | lm78_read_value(client, LM78_REG_IN_MIN(i)); | |
764 | data->in_max[i] = | |
765 | lm78_read_value(client, LM78_REG_IN_MAX(i)); | |
766 | } | |
767 | for (i = 0; i < 3; i++) { | |
768 | data->fan[i] = | |
769 | lm78_read_value(client, LM78_REG_FAN(i)); | |
770 | data->fan_min[i] = | |
771 | lm78_read_value(client, LM78_REG_FAN_MIN(i)); | |
772 | } | |
773 | data->temp = lm78_read_value(client, LM78_REG_TEMP); | |
774 | data->temp_over = | |
775 | lm78_read_value(client, LM78_REG_TEMP_OVER); | |
776 | data->temp_hyst = | |
777 | lm78_read_value(client, LM78_REG_TEMP_HYST); | |
778 | i = lm78_read_value(client, LM78_REG_VID_FANDIV); | |
779 | data->vid = i & 0x0f; | |
780 | if (data->type == lm79) | |
781 | data->vid |= | |
782 | (lm78_read_value(client, LM78_REG_CHIPID) & | |
783 | 0x01) << 4; | |
784 | else | |
785 | data->vid |= 0x10; | |
786 | data->fan_div[0] = (i >> 4) & 0x03; | |
787 | data->fan_div[1] = i >> 6; | |
788 | data->alarms = lm78_read_value(client, LM78_REG_ALARM1) + | |
789 | (lm78_read_value(client, LM78_REG_ALARM2) << 8); | |
790 | data->last_updated = jiffies; | |
791 | data->valid = 1; | |
792 | ||
793 | data->fan_div[2] = 1; | |
794 | } | |
795 | ||
796 | up(&data->update_lock); | |
797 | ||
798 | return data; | |
799 | } | |
800 | ||
801 | static int __init sm_lm78_init(void) | |
802 | { | |
fde09509 JD |
803 | int res; |
804 | ||
805 | res = i2c_add_driver(&lm78_driver); | |
806 | if (res) | |
807 | return res; | |
808 | ||
809 | res = i2c_isa_add_driver(&lm78_isa_driver); | |
810 | if (res) { | |
811 | i2c_del_driver(&lm78_driver); | |
812 | return res; | |
813 | } | |
814 | ||
815 | return 0; | |
1da177e4 LT |
816 | } |
817 | ||
818 | static void __exit sm_lm78_exit(void) | |
819 | { | |
fde09509 | 820 | i2c_isa_del_driver(&lm78_isa_driver); |
1da177e4 LT |
821 | i2c_del_driver(&lm78_driver); |
822 | } | |
823 | ||
824 | ||
825 | ||
826 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>"); | |
27fe048e | 827 | MODULE_DESCRIPTION("LM78/LM79 driver"); |
1da177e4 LT |
828 | MODULE_LICENSE("GPL"); |
829 | ||
830 | module_init(sm_lm78_init); | |
831 | module_exit(sm_lm78_exit); |