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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> | |
26 | #include <linux/i2c-sensor.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 }; | |
36 | static unsigned int normal_isa[] = { 0x0290, I2C_CLIENT_ISA_END }; | |
37 | ||
38 | /* Insmod parameters */ | |
27fe048e | 39 | SENSORS_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); | |
162 | static int lm78_detect(struct i2c_adapter *adapter, int address, int kind); | |
163 | static int lm78_detach_client(struct i2c_client *client); | |
164 | ||
165 | static int lm78_read_value(struct i2c_client *client, u8 register); | |
166 | static int lm78_write_value(struct i2c_client *client, u8 register, u8 value); | |
167 | static struct lm78_data *lm78_update_device(struct device *dev); | |
168 | static void lm78_init_client(struct i2c_client *client); | |
169 | ||
170 | ||
171 | static struct i2c_driver lm78_driver = { | |
172 | .owner = THIS_MODULE, | |
173 | .name = "lm78", | |
174 | .id = I2C_DRIVERID_LM78, | |
175 | .flags = I2C_DF_NOTIFY, | |
176 | .attach_adapter = lm78_attach_adapter, | |
177 | .detach_client = lm78_detach_client, | |
178 | }; | |
179 | ||
180 | /* 7 Voltages */ | |
181 | static ssize_t show_in(struct device *dev, char *buf, int nr) | |
182 | { | |
183 | struct lm78_data *data = lm78_update_device(dev); | |
184 | return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr])); | |
185 | } | |
186 | ||
187 | static ssize_t show_in_min(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_min[nr])); | |
191 | } | |
192 | ||
193 | static ssize_t show_in_max(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_max[nr])); | |
197 | } | |
198 | ||
199 | static ssize_t set_in_min(struct device *dev, const char *buf, | |
200 | size_t count, int nr) | |
201 | { | |
202 | struct i2c_client *client = to_i2c_client(dev); | |
203 | struct lm78_data *data = i2c_get_clientdata(client); | |
204 | unsigned long val = simple_strtoul(buf, NULL, 10); | |
205 | ||
206 | down(&data->update_lock); | |
207 | data->in_min[nr] = IN_TO_REG(val); | |
208 | lm78_write_value(client, LM78_REG_IN_MIN(nr), data->in_min[nr]); | |
209 | up(&data->update_lock); | |
210 | return count; | |
211 | } | |
212 | ||
213 | static ssize_t set_in_max(struct device *dev, const char *buf, | |
214 | size_t count, int nr) | |
215 | { | |
216 | struct i2c_client *client = to_i2c_client(dev); | |
217 | struct lm78_data *data = i2c_get_clientdata(client); | |
218 | unsigned long val = simple_strtoul(buf, NULL, 10); | |
219 | ||
220 | down(&data->update_lock); | |
221 | data->in_max[nr] = IN_TO_REG(val); | |
222 | lm78_write_value(client, LM78_REG_IN_MAX(nr), data->in_max[nr]); | |
223 | up(&data->update_lock); | |
224 | return count; | |
225 | } | |
226 | ||
227 | #define show_in_offset(offset) \ | |
228 | static ssize_t \ | |
8627f9ba | 229 | show_in##offset (struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
230 | { \ |
231 | return show_in(dev, buf, offset); \ | |
232 | } \ | |
233 | static DEVICE_ATTR(in##offset##_input, S_IRUGO, \ | |
234 | show_in##offset, NULL); \ | |
235 | static ssize_t \ | |
8627f9ba | 236 | show_in##offset##_min (struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
237 | { \ |
238 | return show_in_min(dev, buf, offset); \ | |
239 | } \ | |
240 | static ssize_t \ | |
8627f9ba | 241 | show_in##offset##_max (struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
242 | { \ |
243 | return show_in_max(dev, buf, offset); \ | |
244 | } \ | |
8627f9ba | 245 | static ssize_t set_in##offset##_min (struct device *dev, struct device_attribute *attr, \ |
1da177e4 LT |
246 | const char *buf, size_t count) \ |
247 | { \ | |
248 | return set_in_min(dev, buf, count, offset); \ | |
249 | } \ | |
8627f9ba | 250 | static ssize_t set_in##offset##_max (struct device *dev, struct device_attribute *attr, \ |
1da177e4 LT |
251 | const char *buf, size_t count) \ |
252 | { \ | |
253 | return set_in_max(dev, buf, count, offset); \ | |
254 | } \ | |
255 | static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \ | |
256 | show_in##offset##_min, set_in##offset##_min); \ | |
257 | static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \ | |
258 | show_in##offset##_max, set_in##offset##_max); | |
259 | ||
260 | show_in_offset(0); | |
261 | show_in_offset(1); | |
262 | show_in_offset(2); | |
263 | show_in_offset(3); | |
264 | show_in_offset(4); | |
265 | show_in_offset(5); | |
266 | show_in_offset(6); | |
267 | ||
268 | /* Temperature */ | |
8627f9ba | 269 | static ssize_t show_temp(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
270 | { |
271 | struct lm78_data *data = lm78_update_device(dev); | |
272 | return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp)); | |
273 | } | |
274 | ||
8627f9ba | 275 | static ssize_t show_temp_over(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_over)); | |
279 | } | |
280 | ||
8627f9ba | 281 | static ssize_t set_temp_over(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
282 | { |
283 | struct i2c_client *client = to_i2c_client(dev); | |
284 | struct lm78_data *data = i2c_get_clientdata(client); | |
285 | long val = simple_strtol(buf, NULL, 10); | |
286 | ||
287 | down(&data->update_lock); | |
288 | data->temp_over = TEMP_TO_REG(val); | |
289 | lm78_write_value(client, LM78_REG_TEMP_OVER, data->temp_over); | |
290 | up(&data->update_lock); | |
291 | return count; | |
292 | } | |
293 | ||
8627f9ba | 294 | static ssize_t show_temp_hyst(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
295 | { |
296 | struct lm78_data *data = lm78_update_device(dev); | |
297 | return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_hyst)); | |
298 | } | |
299 | ||
8627f9ba | 300 | static ssize_t set_temp_hyst(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
301 | { |
302 | struct i2c_client *client = to_i2c_client(dev); | |
303 | struct lm78_data *data = i2c_get_clientdata(client); | |
304 | long val = simple_strtol(buf, NULL, 10); | |
305 | ||
306 | down(&data->update_lock); | |
307 | data->temp_hyst = TEMP_TO_REG(val); | |
308 | lm78_write_value(client, LM78_REG_TEMP_HYST, data->temp_hyst); | |
309 | up(&data->update_lock); | |
310 | return count; | |
311 | } | |
312 | ||
313 | static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL); | |
314 | static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, | |
315 | show_temp_over, set_temp_over); | |
316 | static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR, | |
317 | show_temp_hyst, set_temp_hyst); | |
318 | ||
319 | /* 3 Fans */ | |
320 | static ssize_t show_fan(struct device *dev, char *buf, int nr) | |
321 | { | |
322 | struct lm78_data *data = lm78_update_device(dev); | |
323 | return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr], | |
324 | DIV_FROM_REG(data->fan_div[nr])) ); | |
325 | } | |
326 | ||
327 | static ssize_t show_fan_min(struct device *dev, char *buf, int nr) | |
328 | { | |
329 | struct lm78_data *data = lm78_update_device(dev); | |
330 | return sprintf(buf,"%d\n", FAN_FROM_REG(data->fan_min[nr], | |
331 | DIV_FROM_REG(data->fan_div[nr])) ); | |
332 | } | |
333 | ||
334 | static ssize_t set_fan_min(struct device *dev, const char *buf, | |
335 | size_t count, int nr) | |
336 | { | |
337 | struct i2c_client *client = to_i2c_client(dev); | |
338 | struct lm78_data *data = i2c_get_clientdata(client); | |
339 | unsigned long val = simple_strtoul(buf, NULL, 10); | |
340 | ||
341 | down(&data->update_lock); | |
342 | data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr])); | |
343 | lm78_write_value(client, LM78_REG_FAN_MIN(nr), data->fan_min[nr]); | |
344 | up(&data->update_lock); | |
345 | return count; | |
346 | } | |
347 | ||
348 | static ssize_t show_fan_div(struct device *dev, char *buf, int nr) | |
349 | { | |
350 | struct lm78_data *data = lm78_update_device(dev); | |
351 | return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]) ); | |
352 | } | |
353 | ||
354 | /* Note: we save and restore the fan minimum here, because its value is | |
355 | determined in part by the fan divisor. This follows the principle of | |
356 | least suprise; the user doesn't expect the fan minimum to change just | |
357 | because the divisor changed. */ | |
358 | static ssize_t set_fan_div(struct device *dev, const char *buf, | |
359 | size_t count, int nr) | |
360 | { | |
361 | struct i2c_client *client = to_i2c_client(dev); | |
362 | struct lm78_data *data = i2c_get_clientdata(client); | |
363 | unsigned long val = simple_strtoul(buf, NULL, 10); | |
364 | unsigned long min; | |
365 | u8 reg; | |
366 | ||
367 | down(&data->update_lock); | |
368 | min = FAN_FROM_REG(data->fan_min[nr], | |
369 | DIV_FROM_REG(data->fan_div[nr])); | |
370 | ||
371 | switch (val) { | |
372 | case 1: data->fan_div[nr] = 0; break; | |
373 | case 2: data->fan_div[nr] = 1; break; | |
374 | case 4: data->fan_div[nr] = 2; break; | |
375 | case 8: data->fan_div[nr] = 3; break; | |
376 | default: | |
377 | dev_err(&client->dev, "fan_div value %ld not " | |
378 | "supported. Choose one of 1, 2, 4 or 8!\n", val); | |
379 | up(&data->update_lock); | |
380 | return -EINVAL; | |
381 | } | |
382 | ||
383 | reg = lm78_read_value(client, LM78_REG_VID_FANDIV); | |
384 | switch (nr) { | |
385 | case 0: | |
386 | reg = (reg & 0xcf) | (data->fan_div[nr] << 4); | |
387 | break; | |
388 | case 1: | |
389 | reg = (reg & 0x3f) | (data->fan_div[nr] << 6); | |
390 | break; | |
391 | } | |
392 | lm78_write_value(client, LM78_REG_VID_FANDIV, reg); | |
393 | ||
394 | data->fan_min[nr] = | |
395 | FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr])); | |
396 | lm78_write_value(client, LM78_REG_FAN_MIN(nr), data->fan_min[nr]); | |
397 | up(&data->update_lock); | |
398 | ||
399 | return count; | |
400 | } | |
401 | ||
402 | #define show_fan_offset(offset) \ | |
8627f9ba | 403 | static ssize_t show_fan_##offset (struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
404 | { \ |
405 | return show_fan(dev, buf, offset - 1); \ | |
406 | } \ | |
8627f9ba | 407 | static ssize_t show_fan_##offset##_min (struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
408 | { \ |
409 | return show_fan_min(dev, buf, offset - 1); \ | |
410 | } \ | |
8627f9ba | 411 | static ssize_t show_fan_##offset##_div (struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
412 | { \ |
413 | return show_fan_div(dev, buf, offset - 1); \ | |
414 | } \ | |
8627f9ba | 415 | static ssize_t set_fan_##offset##_min (struct device *dev, struct device_attribute *attr, \ |
1da177e4 LT |
416 | const char *buf, size_t count) \ |
417 | { \ | |
418 | return set_fan_min(dev, buf, count, offset - 1); \ | |
419 | } \ | |
420 | static DEVICE_ATTR(fan##offset##_input, S_IRUGO, show_fan_##offset, NULL);\ | |
421 | static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \ | |
422 | show_fan_##offset##_min, set_fan_##offset##_min); | |
423 | ||
8627f9ba | 424 | static ssize_t set_fan_1_div(struct device *dev, struct device_attribute *attr, const char *buf, |
1da177e4 LT |
425 | size_t count) |
426 | { | |
427 | return set_fan_div(dev, buf, count, 0) ; | |
428 | } | |
429 | ||
8627f9ba | 430 | static ssize_t set_fan_2_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, 1) ; | |
434 | } | |
435 | ||
436 | show_fan_offset(1); | |
437 | show_fan_offset(2); | |
438 | show_fan_offset(3); | |
439 | ||
440 | /* Fan 3 divisor is locked in H/W */ | |
441 | static DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR, | |
442 | show_fan_1_div, set_fan_1_div); | |
443 | static DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR, | |
444 | show_fan_2_div, set_fan_2_div); | |
445 | static DEVICE_ATTR(fan3_div, S_IRUGO, show_fan_3_div, NULL); | |
446 | ||
447 | /* VID */ | |
8627f9ba | 448 | static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
449 | { |
450 | struct lm78_data *data = lm78_update_device(dev); | |
451 | return sprintf(buf, "%d\n", VID_FROM_REG(data->vid)); | |
452 | } | |
453 | static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL); | |
454 | ||
455 | /* Alarms */ | |
8627f9ba | 456 | static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
457 | { |
458 | struct lm78_data *data = lm78_update_device(dev); | |
459 | return sprintf(buf, "%u\n", data->alarms); | |
460 | } | |
461 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); | |
462 | ||
463 | /* This function is called when: | |
464 | * lm78_driver is inserted (when this module is loaded), for each | |
465 | available adapter | |
466 | * when a new adapter is inserted (and lm78_driver is still present) */ | |
467 | static int lm78_attach_adapter(struct i2c_adapter *adapter) | |
468 | { | |
469 | if (!(adapter->class & I2C_CLASS_HWMON)) | |
470 | return 0; | |
471 | return i2c_detect(adapter, &addr_data, lm78_detect); | |
472 | } | |
473 | ||
474 | /* This function is called by i2c_detect */ | |
475 | int lm78_detect(struct i2c_adapter *adapter, int address, int kind) | |
476 | { | |
477 | int i, err; | |
478 | struct i2c_client *new_client; | |
479 | struct lm78_data *data; | |
480 | const char *client_name = ""; | |
481 | int is_isa = i2c_is_isa_adapter(adapter); | |
482 | ||
483 | if (!is_isa && | |
484 | !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { | |
485 | err = -ENODEV; | |
486 | goto ERROR0; | |
487 | } | |
488 | ||
489 | /* Reserve the ISA region */ | |
490 | if (is_isa) | |
491 | if (!request_region(address, LM78_EXTENT, lm78_driver.name)) { | |
492 | err = -EBUSY; | |
493 | goto ERROR0; | |
494 | } | |
495 | ||
496 | /* Probe whether there is anything available on this address. Already | |
497 | done for SMBus clients */ | |
498 | if (kind < 0) { | |
499 | if (is_isa) { | |
500 | ||
501 | #define REALLY_SLOW_IO | |
502 | /* We need the timeouts for at least some LM78-like | |
503 | chips. But only if we read 'undefined' registers. */ | |
504 | i = inb_p(address + 1); | |
505 | if (inb_p(address + 2) != i) { | |
506 | err = -ENODEV; | |
507 | goto ERROR1; | |
508 | } | |
509 | if (inb_p(address + 3) != i) { | |
510 | err = -ENODEV; | |
511 | goto ERROR1; | |
512 | } | |
513 | if (inb_p(address + 7) != i) { | |
514 | err = -ENODEV; | |
515 | goto ERROR1; | |
516 | } | |
517 | #undef REALLY_SLOW_IO | |
518 | ||
519 | /* Let's just hope nothing breaks here */ | |
520 | i = inb_p(address + 5) & 0x7f; | |
521 | outb_p(~i & 0x7f, address + 5); | |
522 | if ((inb_p(address + 5) & 0x7f) != (~i & 0x7f)) { | |
523 | outb_p(i, address + 5); | |
524 | err = -ENODEV; | |
525 | goto ERROR1; | |
526 | } | |
527 | } | |
528 | } | |
529 | ||
530 | /* OK. For now, we presume we have a valid client. We now create the | |
531 | client structure, even though we cannot fill it completely yet. | |
532 | But it allows us to access lm78_{read,write}_value. */ | |
533 | ||
534 | if (!(data = kmalloc(sizeof(struct lm78_data), GFP_KERNEL))) { | |
535 | err = -ENOMEM; | |
536 | goto ERROR1; | |
537 | } | |
538 | memset(data, 0, sizeof(struct lm78_data)); | |
539 | ||
540 | new_client = &data->client; | |
541 | if (is_isa) | |
542 | init_MUTEX(&data->lock); | |
543 | i2c_set_clientdata(new_client, data); | |
544 | new_client->addr = address; | |
545 | new_client->adapter = adapter; | |
546 | new_client->driver = &lm78_driver; | |
547 | new_client->flags = 0; | |
548 | ||
549 | /* Now, we do the remaining detection. */ | |
550 | if (kind < 0) { | |
551 | if (lm78_read_value(new_client, LM78_REG_CONFIG) & 0x80) { | |
552 | err = -ENODEV; | |
553 | goto ERROR2; | |
554 | } | |
555 | if (!is_isa && (lm78_read_value( | |
556 | new_client, LM78_REG_I2C_ADDR) != address)) { | |
557 | err = -ENODEV; | |
558 | goto ERROR2; | |
559 | } | |
560 | } | |
561 | ||
562 | /* Determine the chip type. */ | |
563 | if (kind <= 0) { | |
564 | i = lm78_read_value(new_client, LM78_REG_CHIPID); | |
27fe048e JD |
565 | if (i == 0x00 || i == 0x20 /* LM78 */ |
566 | || i == 0x40) /* LM78-J */ | |
1da177e4 | 567 | kind = lm78; |
1da177e4 LT |
568 | else if ((i & 0xfe) == 0xc0) |
569 | kind = lm79; | |
570 | else { | |
571 | if (kind == 0) | |
572 | dev_warn(&adapter->dev, "Ignoring 'force' " | |
573 | "parameter for unknown chip at " | |
574 | "adapter %d, address 0x%02x\n", | |
575 | i2c_adapter_id(adapter), address); | |
576 | err = -ENODEV; | |
577 | goto ERROR2; | |
578 | } | |
579 | } | |
580 | ||
581 | if (kind == lm78) { | |
582 | client_name = "lm78"; | |
1da177e4 LT |
583 | } else if (kind == lm79) { |
584 | client_name = "lm79"; | |
585 | } | |
586 | ||
587 | /* Fill in the remaining client fields and put into the global list */ | |
588 | strlcpy(new_client->name, client_name, I2C_NAME_SIZE); | |
589 | data->type = kind; | |
590 | ||
591 | data->valid = 0; | |
592 | init_MUTEX(&data->update_lock); | |
593 | ||
594 | /* Tell the I2C layer a new client has arrived */ | |
595 | if ((err = i2c_attach_client(new_client))) | |
596 | goto ERROR2; | |
597 | ||
598 | /* Initialize the LM78 chip */ | |
599 | lm78_init_client(new_client); | |
600 | ||
601 | /* A few vars need to be filled upon startup */ | |
602 | for (i = 0; i < 3; i++) { | |
603 | data->fan_min[i] = lm78_read_value(new_client, | |
604 | LM78_REG_FAN_MIN(i)); | |
605 | } | |
606 | ||
607 | /* Register sysfs hooks */ | |
943b0830 MH |
608 | data->class_dev = hwmon_device_register(&new_client->dev); |
609 | if (IS_ERR(data->class_dev)) { | |
610 | err = PTR_ERR(data->class_dev); | |
611 | goto ERROR3; | |
612 | } | |
613 | ||
1da177e4 LT |
614 | device_create_file(&new_client->dev, &dev_attr_in0_input); |
615 | device_create_file(&new_client->dev, &dev_attr_in0_min); | |
616 | device_create_file(&new_client->dev, &dev_attr_in0_max); | |
617 | device_create_file(&new_client->dev, &dev_attr_in1_input); | |
618 | device_create_file(&new_client->dev, &dev_attr_in1_min); | |
619 | device_create_file(&new_client->dev, &dev_attr_in1_max); | |
620 | device_create_file(&new_client->dev, &dev_attr_in2_input); | |
621 | device_create_file(&new_client->dev, &dev_attr_in2_min); | |
622 | device_create_file(&new_client->dev, &dev_attr_in2_max); | |
623 | device_create_file(&new_client->dev, &dev_attr_in3_input); | |
624 | device_create_file(&new_client->dev, &dev_attr_in3_min); | |
625 | device_create_file(&new_client->dev, &dev_attr_in3_max); | |
626 | device_create_file(&new_client->dev, &dev_attr_in4_input); | |
627 | device_create_file(&new_client->dev, &dev_attr_in4_min); | |
628 | device_create_file(&new_client->dev, &dev_attr_in4_max); | |
629 | device_create_file(&new_client->dev, &dev_attr_in5_input); | |
630 | device_create_file(&new_client->dev, &dev_attr_in5_min); | |
631 | device_create_file(&new_client->dev, &dev_attr_in5_max); | |
632 | device_create_file(&new_client->dev, &dev_attr_in6_input); | |
633 | device_create_file(&new_client->dev, &dev_attr_in6_min); | |
634 | device_create_file(&new_client->dev, &dev_attr_in6_max); | |
635 | device_create_file(&new_client->dev, &dev_attr_temp1_input); | |
636 | device_create_file(&new_client->dev, &dev_attr_temp1_max); | |
637 | device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst); | |
638 | device_create_file(&new_client->dev, &dev_attr_fan1_input); | |
639 | device_create_file(&new_client->dev, &dev_attr_fan1_min); | |
640 | device_create_file(&new_client->dev, &dev_attr_fan1_div); | |
641 | device_create_file(&new_client->dev, &dev_attr_fan2_input); | |
642 | device_create_file(&new_client->dev, &dev_attr_fan2_min); | |
643 | device_create_file(&new_client->dev, &dev_attr_fan2_div); | |
644 | device_create_file(&new_client->dev, &dev_attr_fan3_input); | |
645 | device_create_file(&new_client->dev, &dev_attr_fan3_min); | |
646 | device_create_file(&new_client->dev, &dev_attr_fan3_div); | |
647 | device_create_file(&new_client->dev, &dev_attr_alarms); | |
648 | device_create_file(&new_client->dev, &dev_attr_cpu0_vid); | |
649 | ||
650 | return 0; | |
651 | ||
943b0830 MH |
652 | ERROR3: |
653 | i2c_detach_client(new_client); | |
1da177e4 LT |
654 | ERROR2: |
655 | kfree(data); | |
656 | ERROR1: | |
657 | if (is_isa) | |
658 | release_region(address, LM78_EXTENT); | |
659 | ERROR0: | |
660 | return err; | |
661 | } | |
662 | ||
663 | static int lm78_detach_client(struct i2c_client *client) | |
664 | { | |
943b0830 | 665 | struct lm78_data *data = i2c_get_clientdata(client); |
1da177e4 LT |
666 | int err; |
667 | ||
943b0830 MH |
668 | hwmon_device_unregister(data->class_dev); |
669 | ||
1da177e4 LT |
670 | if ((err = i2c_detach_client(client))) { |
671 | dev_err(&client->dev, | |
672 | "Client deregistration failed, client not detached.\n"); | |
673 | return err; | |
674 | } | |
675 | ||
676 | if(i2c_is_isa_client(client)) | |
677 | release_region(client->addr, LM78_EXTENT); | |
678 | ||
943b0830 | 679 | kfree(data); |
1da177e4 LT |
680 | |
681 | return 0; | |
682 | } | |
683 | ||
44bbe87e | 684 | /* The SMBus locks itself, but ISA access must be locked explicitly! |
1da177e4 LT |
685 | We don't want to lock the whole ISA bus, so we lock each client |
686 | separately. | |
687 | We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks, | |
688 | would slow down the LM78 access and should not be necessary. */ | |
689 | static int lm78_read_value(struct i2c_client *client, u8 reg) | |
690 | { | |
691 | int res; | |
692 | if (i2c_is_isa_client(client)) { | |
693 | struct lm78_data *data = i2c_get_clientdata(client); | |
694 | down(&data->lock); | |
695 | outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET); | |
696 | res = inb_p(client->addr + LM78_DATA_REG_OFFSET); | |
697 | up(&data->lock); | |
698 | return res; | |
699 | } else | |
700 | return i2c_smbus_read_byte_data(client, reg); | |
701 | } | |
702 | ||
44bbe87e | 703 | /* The SMBus locks itself, but ISA access muse be locked explicitly! |
1da177e4 LT |
704 | We don't want to lock the whole ISA bus, so we lock each client |
705 | separately. | |
706 | We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks, | |
707 | would slow down the LM78 access and should not be necessary. | |
708 | There are some ugly typecasts here, but the good new is - they should | |
709 | nowhere else be necessary! */ | |
710 | static int lm78_write_value(struct i2c_client *client, u8 reg, u8 value) | |
711 | { | |
712 | if (i2c_is_isa_client(client)) { | |
713 | struct lm78_data *data = i2c_get_clientdata(client); | |
714 | down(&data->lock); | |
715 | outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET); | |
716 | outb_p(value, client->addr + LM78_DATA_REG_OFFSET); | |
717 | up(&data->lock); | |
718 | return 0; | |
719 | } else | |
720 | return i2c_smbus_write_byte_data(client, reg, value); | |
721 | } | |
722 | ||
723 | /* Called when we have found a new LM78. It should set limits, etc. */ | |
724 | static void lm78_init_client(struct i2c_client *client) | |
725 | { | |
726 | u8 config = lm78_read_value(client, LM78_REG_CONFIG); | |
727 | ||
728 | /* Start monitoring */ | |
729 | if (!(config & 0x01)) | |
730 | lm78_write_value(client, LM78_REG_CONFIG, | |
731 | (config & 0xf7) | 0x01); | |
732 | } | |
733 | ||
734 | static struct lm78_data *lm78_update_device(struct device *dev) | |
735 | { | |
736 | struct i2c_client *client = to_i2c_client(dev); | |
737 | struct lm78_data *data = i2c_get_clientdata(client); | |
738 | int i; | |
739 | ||
740 | down(&data->update_lock); | |
741 | ||
742 | if (time_after(jiffies, data->last_updated + HZ + HZ / 2) | |
743 | || !data->valid) { | |
744 | ||
745 | dev_dbg(&client->dev, "Starting lm78 update\n"); | |
746 | ||
747 | for (i = 0; i <= 6; i++) { | |
748 | data->in[i] = | |
749 | lm78_read_value(client, LM78_REG_IN(i)); | |
750 | data->in_min[i] = | |
751 | lm78_read_value(client, LM78_REG_IN_MIN(i)); | |
752 | data->in_max[i] = | |
753 | lm78_read_value(client, LM78_REG_IN_MAX(i)); | |
754 | } | |
755 | for (i = 0; i < 3; i++) { | |
756 | data->fan[i] = | |
757 | lm78_read_value(client, LM78_REG_FAN(i)); | |
758 | data->fan_min[i] = | |
759 | lm78_read_value(client, LM78_REG_FAN_MIN(i)); | |
760 | } | |
761 | data->temp = lm78_read_value(client, LM78_REG_TEMP); | |
762 | data->temp_over = | |
763 | lm78_read_value(client, LM78_REG_TEMP_OVER); | |
764 | data->temp_hyst = | |
765 | lm78_read_value(client, LM78_REG_TEMP_HYST); | |
766 | i = lm78_read_value(client, LM78_REG_VID_FANDIV); | |
767 | data->vid = i & 0x0f; | |
768 | if (data->type == lm79) | |
769 | data->vid |= | |
770 | (lm78_read_value(client, LM78_REG_CHIPID) & | |
771 | 0x01) << 4; | |
772 | else | |
773 | data->vid |= 0x10; | |
774 | data->fan_div[0] = (i >> 4) & 0x03; | |
775 | data->fan_div[1] = i >> 6; | |
776 | data->alarms = lm78_read_value(client, LM78_REG_ALARM1) + | |
777 | (lm78_read_value(client, LM78_REG_ALARM2) << 8); | |
778 | data->last_updated = jiffies; | |
779 | data->valid = 1; | |
780 | ||
781 | data->fan_div[2] = 1; | |
782 | } | |
783 | ||
784 | up(&data->update_lock); | |
785 | ||
786 | return data; | |
787 | } | |
788 | ||
789 | static int __init sm_lm78_init(void) | |
790 | { | |
791 | return i2c_add_driver(&lm78_driver); | |
792 | } | |
793 | ||
794 | static void __exit sm_lm78_exit(void) | |
795 | { | |
796 | i2c_del_driver(&lm78_driver); | |
797 | } | |
798 | ||
799 | ||
800 | ||
801 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>"); | |
27fe048e | 802 | MODULE_DESCRIPTION("LM78/LM79 driver"); |
1da177e4 LT |
803 | MODULE_LICENSE("GPL"); |
804 | ||
805 | module_init(sm_lm78_init); | |
806 | module_exit(sm_lm78_exit); |