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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> | |
c40769fe | 5 | Copyright (c) 2007 Jean Delvare <khali@linux-fr.org> |
1da177e4 LT |
6 | |
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
20 | */ | |
21 | ||
1da177e4 LT |
22 | #include <linux/module.h> |
23 | #include <linux/init.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/jiffies.h> | |
26 | #include <linux/i2c.h> | |
c40769fe JD |
27 | #include <linux/platform_device.h> |
28 | #include <linux/ioport.h> | |
943b0830 | 29 | #include <linux/hwmon.h> |
19f673ed | 30 | #include <linux/hwmon-vid.h> |
247dde4c | 31 | #include <linux/hwmon-sysfs.h> |
943b0830 | 32 | #include <linux/err.h> |
9a61bf63 | 33 | #include <linux/mutex.h> |
1da177e4 LT |
34 | #include <asm/io.h> |
35 | ||
c40769fe JD |
36 | /* ISA device, if found */ |
37 | static struct platform_device *pdev; | |
38 | ||
1da177e4 | 39 | /* Addresses to scan */ |
25e9c86d MH |
40 | static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, |
41 | 0x2e, 0x2f, I2C_CLIENT_END }; | |
2d8672c5 | 42 | static unsigned short isa_address = 0x290; |
1da177e4 LT |
43 | |
44 | /* Insmod parameters */ | |
f4b50261 | 45 | I2C_CLIENT_INSMOD_2(lm78, lm79); |
1da177e4 LT |
46 | |
47 | /* Many LM78 constants specified below */ | |
48 | ||
49 | /* Length of ISA address segment */ | |
50 | #define LM78_EXTENT 8 | |
51 | ||
52 | /* Where are the ISA address/data registers relative to the base address */ | |
53 | #define LM78_ADDR_REG_OFFSET 5 | |
54 | #define LM78_DATA_REG_OFFSET 6 | |
55 | ||
56 | /* The LM78 registers */ | |
57 | #define LM78_REG_IN_MAX(nr) (0x2b + (nr) * 2) | |
58 | #define LM78_REG_IN_MIN(nr) (0x2c + (nr) * 2) | |
59 | #define LM78_REG_IN(nr) (0x20 + (nr)) | |
60 | ||
61 | #define LM78_REG_FAN_MIN(nr) (0x3b + (nr)) | |
62 | #define LM78_REG_FAN(nr) (0x28 + (nr)) | |
63 | ||
64 | #define LM78_REG_TEMP 0x27 | |
65 | #define LM78_REG_TEMP_OVER 0x39 | |
66 | #define LM78_REG_TEMP_HYST 0x3a | |
67 | ||
68 | #define LM78_REG_ALARM1 0x41 | |
69 | #define LM78_REG_ALARM2 0x42 | |
70 | ||
71 | #define LM78_REG_VID_FANDIV 0x47 | |
72 | ||
73 | #define LM78_REG_CONFIG 0x40 | |
74 | #define LM78_REG_CHIPID 0x49 | |
75 | #define LM78_REG_I2C_ADDR 0x48 | |
76 | ||
77 | ||
78 | /* Conversions. Rounding and limit checking is only done on the TO_REG | |
79 | variants. */ | |
80 | ||
81 | /* IN: mV, (0V to 4.08V) | |
82 | REG: 16mV/bit */ | |
83 | static inline u8 IN_TO_REG(unsigned long val) | |
84 | { | |
85 | unsigned long nval = SENSORS_LIMIT(val, 0, 4080); | |
86 | return (nval + 8) / 16; | |
87 | } | |
88 | #define IN_FROM_REG(val) ((val) * 16) | |
89 | ||
90 | static inline u8 FAN_TO_REG(long rpm, int div) | |
91 | { | |
92 | if (rpm <= 0) | |
93 | return 255; | |
94 | return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 254); | |
95 | } | |
96 | ||
97 | static inline int FAN_FROM_REG(u8 val, int div) | |
98 | { | |
99 | return val==0 ? -1 : val==255 ? 0 : 1350000/(val*div); | |
100 | } | |
101 | ||
102 | /* TEMP: mC (-128C to +127C) | |
103 | REG: 1C/bit, two's complement */ | |
104 | static inline s8 TEMP_TO_REG(int val) | |
105 | { | |
106 | int nval = SENSORS_LIMIT(val, -128000, 127000) ; | |
107 | return nval<0 ? (nval-500)/1000 : (nval+500)/1000; | |
108 | } | |
109 | ||
110 | static inline int TEMP_FROM_REG(s8 val) | |
111 | { | |
112 | return val * 1000; | |
113 | } | |
114 | ||
1da177e4 LT |
115 | #define DIV_FROM_REG(val) (1 << (val)) |
116 | ||
117 | /* There are some complications in a module like this. First off, LM78 chips | |
118 | may be both present on the SMBus and the ISA bus, and we have to handle | |
119 | those cases separately at some places. Second, there might be several | |
120 | LM78 chips available (well, actually, that is probably never done; but | |
121 | it is a clean illustration of how to handle a case like that). Finally, | |
122 | a specific chip may be attached to *both* ISA and SMBus, and we would | |
18c73f90 | 123 | not like to detect it double. */ |
1da177e4 | 124 | |
c40769fe JD |
125 | /* For ISA chips, we abuse the i2c_client addr and name fields. We also use |
126 | the driver field to differentiate between I2C and ISA chips. */ | |
1da177e4 LT |
127 | struct lm78_data { |
128 | struct i2c_client client; | |
1beeffe4 | 129 | struct device *hwmon_dev; |
9a61bf63 | 130 | struct mutex lock; |
1da177e4 LT |
131 | enum chips type; |
132 | ||
9a61bf63 | 133 | struct mutex update_lock; |
1da177e4 LT |
134 | char valid; /* !=0 if following fields are valid */ |
135 | unsigned long last_updated; /* In jiffies */ | |
136 | ||
137 | u8 in[7]; /* Register value */ | |
138 | u8 in_max[7]; /* Register value */ | |
139 | u8 in_min[7]; /* Register value */ | |
140 | u8 fan[3]; /* Register value */ | |
141 | u8 fan_min[3]; /* Register value */ | |
142 | s8 temp; /* Register value */ | |
143 | s8 temp_over; /* Register value */ | |
144 | s8 temp_hyst; /* Register value */ | |
145 | u8 fan_div[3]; /* Register encoding, shifted right */ | |
146 | u8 vid; /* Register encoding, combined */ | |
147 | u16 alarms; /* Register encoding, combined */ | |
148 | }; | |
149 | ||
150 | ||
151 | static int lm78_attach_adapter(struct i2c_adapter *adapter); | |
152 | static int lm78_detect(struct i2c_adapter *adapter, int address, int kind); | |
153 | static int lm78_detach_client(struct i2c_client *client); | |
154 | ||
c40769fe JD |
155 | static int __devinit lm78_isa_probe(struct platform_device *pdev); |
156 | static int __devexit lm78_isa_remove(struct platform_device *pdev); | |
157 | ||
c59cc301 JD |
158 | static int lm78_read_value(struct lm78_data *data, u8 reg); |
159 | static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value); | |
1da177e4 | 160 | static struct lm78_data *lm78_update_device(struct device *dev); |
c59cc301 | 161 | static void lm78_init_device(struct lm78_data *data); |
1da177e4 LT |
162 | |
163 | ||
164 | static struct i2c_driver lm78_driver = { | |
cdaf7934 | 165 | .driver = { |
cdaf7934 LR |
166 | .name = "lm78", |
167 | }, | |
1da177e4 LT |
168 | .attach_adapter = lm78_attach_adapter, |
169 | .detach_client = lm78_detach_client, | |
170 | }; | |
171 | ||
c40769fe | 172 | static struct platform_driver lm78_isa_driver = { |
cdaf7934 | 173 | .driver = { |
87218842 | 174 | .owner = THIS_MODULE, |
c40769fe | 175 | .name = "lm78", |
cdaf7934 | 176 | }, |
c40769fe JD |
177 | .probe = lm78_isa_probe, |
178 | .remove = lm78_isa_remove, | |
fde09509 JD |
179 | }; |
180 | ||
181 | ||
1da177e4 | 182 | /* 7 Voltages */ |
247dde4c JD |
183 | static ssize_t show_in(struct device *dev, struct device_attribute *da, |
184 | char *buf) | |
1da177e4 | 185 | { |
247dde4c | 186 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
1da177e4 | 187 | struct lm78_data *data = lm78_update_device(dev); |
247dde4c | 188 | return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index])); |
1da177e4 LT |
189 | } |
190 | ||
247dde4c JD |
191 | static ssize_t show_in_min(struct device *dev, struct device_attribute *da, |
192 | char *buf) | |
1da177e4 | 193 | { |
247dde4c | 194 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
1da177e4 | 195 | struct lm78_data *data = lm78_update_device(dev); |
247dde4c | 196 | return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index])); |
1da177e4 LT |
197 | } |
198 | ||
247dde4c JD |
199 | static ssize_t show_in_max(struct device *dev, struct device_attribute *da, |
200 | char *buf) | |
1da177e4 | 201 | { |
247dde4c | 202 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
1da177e4 | 203 | struct lm78_data *data = lm78_update_device(dev); |
247dde4c | 204 | return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index])); |
1da177e4 LT |
205 | } |
206 | ||
247dde4c JD |
207 | static ssize_t set_in_min(struct device *dev, struct device_attribute *da, |
208 | const char *buf, size_t count) | |
1da177e4 | 209 | { |
247dde4c | 210 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
c40769fe | 211 | struct lm78_data *data = dev_get_drvdata(dev); |
1da177e4 | 212 | unsigned long val = simple_strtoul(buf, NULL, 10); |
247dde4c | 213 | int nr = attr->index; |
1da177e4 | 214 | |
9a61bf63 | 215 | mutex_lock(&data->update_lock); |
1da177e4 | 216 | data->in_min[nr] = IN_TO_REG(val); |
c59cc301 | 217 | lm78_write_value(data, LM78_REG_IN_MIN(nr), data->in_min[nr]); |
9a61bf63 | 218 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
219 | return count; |
220 | } | |
221 | ||
247dde4c JD |
222 | static ssize_t set_in_max(struct device *dev, struct device_attribute *da, |
223 | const char *buf, size_t count) | |
1da177e4 | 224 | { |
247dde4c | 225 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
c40769fe | 226 | struct lm78_data *data = dev_get_drvdata(dev); |
1da177e4 | 227 | unsigned long val = simple_strtoul(buf, NULL, 10); |
247dde4c | 228 | int nr = attr->index; |
1da177e4 | 229 | |
9a61bf63 | 230 | mutex_lock(&data->update_lock); |
1da177e4 | 231 | data->in_max[nr] = IN_TO_REG(val); |
c59cc301 | 232 | lm78_write_value(data, LM78_REG_IN_MAX(nr), data->in_max[nr]); |
9a61bf63 | 233 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
234 | return count; |
235 | } | |
236 | ||
237 | #define show_in_offset(offset) \ | |
247dde4c JD |
238 | static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \ |
239 | show_in, NULL, offset); \ | |
240 | static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \ | |
241 | show_in_min, set_in_min, offset); \ | |
242 | static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \ | |
243 | show_in_max, set_in_max, offset); | |
1da177e4 LT |
244 | |
245 | show_in_offset(0); | |
246 | show_in_offset(1); | |
247 | show_in_offset(2); | |
248 | show_in_offset(3); | |
249 | show_in_offset(4); | |
250 | show_in_offset(5); | |
251 | show_in_offset(6); | |
252 | ||
253 | /* Temperature */ | |
247dde4c JD |
254 | static ssize_t show_temp(struct device *dev, struct device_attribute *da, |
255 | char *buf) | |
1da177e4 LT |
256 | { |
257 | struct lm78_data *data = lm78_update_device(dev); | |
258 | return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp)); | |
259 | } | |
260 | ||
247dde4c JD |
261 | static ssize_t show_temp_over(struct device *dev, struct device_attribute *da, |
262 | char *buf) | |
1da177e4 LT |
263 | { |
264 | struct lm78_data *data = lm78_update_device(dev); | |
265 | return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_over)); | |
266 | } | |
267 | ||
247dde4c JD |
268 | static ssize_t set_temp_over(struct device *dev, struct device_attribute *da, |
269 | const char *buf, size_t count) | |
1da177e4 | 270 | { |
c40769fe | 271 | struct lm78_data *data = dev_get_drvdata(dev); |
1da177e4 LT |
272 | long val = simple_strtol(buf, NULL, 10); |
273 | ||
9a61bf63 | 274 | mutex_lock(&data->update_lock); |
1da177e4 | 275 | data->temp_over = TEMP_TO_REG(val); |
c59cc301 | 276 | lm78_write_value(data, LM78_REG_TEMP_OVER, data->temp_over); |
9a61bf63 | 277 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
278 | return count; |
279 | } | |
280 | ||
247dde4c JD |
281 | static ssize_t show_temp_hyst(struct device *dev, struct device_attribute *da, |
282 | char *buf) | |
1da177e4 LT |
283 | { |
284 | struct lm78_data *data = lm78_update_device(dev); | |
285 | return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_hyst)); | |
286 | } | |
287 | ||
247dde4c JD |
288 | static ssize_t set_temp_hyst(struct device *dev, struct device_attribute *da, |
289 | const char *buf, size_t count) | |
1da177e4 | 290 | { |
c40769fe | 291 | struct lm78_data *data = dev_get_drvdata(dev); |
1da177e4 LT |
292 | long val = simple_strtol(buf, NULL, 10); |
293 | ||
9a61bf63 | 294 | mutex_lock(&data->update_lock); |
1da177e4 | 295 | data->temp_hyst = TEMP_TO_REG(val); |
c59cc301 | 296 | lm78_write_value(data, LM78_REG_TEMP_HYST, data->temp_hyst); |
9a61bf63 | 297 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
298 | return count; |
299 | } | |
300 | ||
301 | static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL); | |
302 | static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, | |
303 | show_temp_over, set_temp_over); | |
304 | static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR, | |
305 | show_temp_hyst, set_temp_hyst); | |
306 | ||
307 | /* 3 Fans */ | |
247dde4c JD |
308 | static ssize_t show_fan(struct device *dev, struct device_attribute *da, |
309 | char *buf) | |
1da177e4 | 310 | { |
247dde4c | 311 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
1da177e4 | 312 | struct lm78_data *data = lm78_update_device(dev); |
247dde4c | 313 | int nr = attr->index; |
1da177e4 LT |
314 | return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr], |
315 | DIV_FROM_REG(data->fan_div[nr])) ); | |
316 | } | |
317 | ||
247dde4c JD |
318 | static ssize_t show_fan_min(struct device *dev, struct device_attribute *da, |
319 | char *buf) | |
1da177e4 | 320 | { |
247dde4c | 321 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
1da177e4 | 322 | struct lm78_data *data = lm78_update_device(dev); |
247dde4c | 323 | int nr = attr->index; |
1da177e4 LT |
324 | return sprintf(buf,"%d\n", FAN_FROM_REG(data->fan_min[nr], |
325 | DIV_FROM_REG(data->fan_div[nr])) ); | |
326 | } | |
327 | ||
247dde4c JD |
328 | static ssize_t set_fan_min(struct device *dev, struct device_attribute *da, |
329 | const char *buf, size_t count) | |
1da177e4 | 330 | { |
247dde4c | 331 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
c40769fe | 332 | struct lm78_data *data = dev_get_drvdata(dev); |
247dde4c | 333 | int nr = attr->index; |
1da177e4 LT |
334 | unsigned long val = simple_strtoul(buf, NULL, 10); |
335 | ||
9a61bf63 | 336 | mutex_lock(&data->update_lock); |
1da177e4 | 337 | data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr])); |
c59cc301 | 338 | lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]); |
9a61bf63 | 339 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
340 | return count; |
341 | } | |
342 | ||
247dde4c JD |
343 | static ssize_t show_fan_div(struct device *dev, struct device_attribute *da, |
344 | char *buf) | |
1da177e4 | 345 | { |
247dde4c | 346 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
1da177e4 | 347 | struct lm78_data *data = lm78_update_device(dev); |
247dde4c | 348 | return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index])); |
1da177e4 LT |
349 | } |
350 | ||
351 | /* Note: we save and restore the fan minimum here, because its value is | |
352 | determined in part by the fan divisor. This follows the principle of | |
d6e05edc | 353 | least surprise; the user doesn't expect the fan minimum to change just |
1da177e4 | 354 | because the divisor changed. */ |
247dde4c JD |
355 | static ssize_t set_fan_div(struct device *dev, struct device_attribute *da, |
356 | const char *buf, size_t count) | |
1da177e4 | 357 | { |
247dde4c | 358 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
c40769fe | 359 | struct lm78_data *data = dev_get_drvdata(dev); |
247dde4c | 360 | int nr = attr->index; |
1da177e4 LT |
361 | unsigned long val = simple_strtoul(buf, NULL, 10); |
362 | unsigned long min; | |
363 | u8 reg; | |
364 | ||
9a61bf63 | 365 | mutex_lock(&data->update_lock); |
1da177e4 LT |
366 | min = FAN_FROM_REG(data->fan_min[nr], |
367 | DIV_FROM_REG(data->fan_div[nr])); | |
368 | ||
369 | switch (val) { | |
370 | case 1: data->fan_div[nr] = 0; break; | |
371 | case 2: data->fan_div[nr] = 1; break; | |
372 | case 4: data->fan_div[nr] = 2; break; | |
373 | case 8: data->fan_div[nr] = 3; break; | |
374 | default: | |
c40769fe | 375 | dev_err(dev, "fan_div value %ld not " |
1da177e4 | 376 | "supported. Choose one of 1, 2, 4 or 8!\n", val); |
9a61bf63 | 377 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
378 | return -EINVAL; |
379 | } | |
380 | ||
c59cc301 | 381 | reg = lm78_read_value(data, LM78_REG_VID_FANDIV); |
1da177e4 LT |
382 | switch (nr) { |
383 | case 0: | |
384 | reg = (reg & 0xcf) | (data->fan_div[nr] << 4); | |
385 | break; | |
386 | case 1: | |
387 | reg = (reg & 0x3f) | (data->fan_div[nr] << 6); | |
388 | break; | |
389 | } | |
c59cc301 | 390 | lm78_write_value(data, LM78_REG_VID_FANDIV, reg); |
1da177e4 LT |
391 | |
392 | data->fan_min[nr] = | |
393 | FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr])); | |
c59cc301 | 394 | lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]); |
9a61bf63 | 395 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
396 | |
397 | return count; | |
398 | } | |
399 | ||
247dde4c JD |
400 | #define show_fan_offset(offset) \ |
401 | static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \ | |
402 | show_fan, NULL, offset - 1); \ | |
403 | static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \ | |
404 | show_fan_min, set_fan_min, offset - 1); | |
1da177e4 LT |
405 | |
406 | show_fan_offset(1); | |
407 | show_fan_offset(2); | |
408 | show_fan_offset(3); | |
409 | ||
410 | /* Fan 3 divisor is locked in H/W */ | |
247dde4c JD |
411 | static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR, |
412 | show_fan_div, set_fan_div, 0); | |
413 | static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR, | |
414 | show_fan_div, set_fan_div, 1); | |
415 | static SENSOR_DEVICE_ATTR(fan3_div, S_IRUGO, show_fan_div, NULL, 2); | |
1da177e4 LT |
416 | |
417 | /* VID */ | |
247dde4c JD |
418 | static ssize_t show_vid(struct device *dev, struct device_attribute *da, |
419 | char *buf) | |
1da177e4 LT |
420 | { |
421 | struct lm78_data *data = lm78_update_device(dev); | |
d0d3cd69 | 422 | return sprintf(buf, "%d\n", vid_from_reg(data->vid, 82)); |
1da177e4 LT |
423 | } |
424 | static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL); | |
425 | ||
426 | /* Alarms */ | |
247dde4c JD |
427 | static ssize_t show_alarms(struct device *dev, struct device_attribute *da, |
428 | char *buf) | |
1da177e4 LT |
429 | { |
430 | struct lm78_data *data = lm78_update_device(dev); | |
431 | return sprintf(buf, "%u\n", data->alarms); | |
432 | } | |
433 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); | |
434 | ||
428a7039 JD |
435 | static ssize_t show_alarm(struct device *dev, struct device_attribute *da, |
436 | char *buf) | |
437 | { | |
438 | struct lm78_data *data = lm78_update_device(dev); | |
439 | int nr = to_sensor_dev_attr(da)->index; | |
440 | return sprintf(buf, "%u\n", (data->alarms >> nr) & 1); | |
441 | } | |
442 | static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0); | |
443 | static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1); | |
444 | static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2); | |
445 | static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3); | |
446 | static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8); | |
447 | static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9); | |
448 | static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 10); | |
449 | static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6); | |
450 | static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7); | |
451 | static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 11); | |
452 | static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4); | |
453 | ||
1da177e4 LT |
454 | /* This function is called when: |
455 | * lm78_driver is inserted (when this module is loaded), for each | |
456 | available adapter | |
18c73f90 JD |
457 | * when a new adapter is inserted (and lm78_driver is still present) |
458 | We block updates of the ISA device to minimize the risk of concurrent | |
459 | access to the same LM78 chip through different interfaces. */ | |
1da177e4 LT |
460 | static int lm78_attach_adapter(struct i2c_adapter *adapter) |
461 | { | |
18c73f90 JD |
462 | struct lm78_data *data; |
463 | int err; | |
464 | ||
1da177e4 LT |
465 | if (!(adapter->class & I2C_CLASS_HWMON)) |
466 | return 0; | |
18c73f90 JD |
467 | |
468 | data = pdev ? platform_get_drvdata(pdev) : NULL; | |
469 | if (data) | |
470 | mutex_lock(&data->update_lock); | |
471 | err = i2c_probe(adapter, &addr_data, lm78_detect); | |
472 | if (data) | |
473 | mutex_unlock(&data->update_lock); | |
474 | return err; | |
1da177e4 LT |
475 | } |
476 | ||
c1685f61 | 477 | static struct attribute *lm78_attributes[] = { |
247dde4c JD |
478 | &sensor_dev_attr_in0_input.dev_attr.attr, |
479 | &sensor_dev_attr_in0_min.dev_attr.attr, | |
480 | &sensor_dev_attr_in0_max.dev_attr.attr, | |
428a7039 | 481 | &sensor_dev_attr_in0_alarm.dev_attr.attr, |
247dde4c JD |
482 | &sensor_dev_attr_in1_input.dev_attr.attr, |
483 | &sensor_dev_attr_in1_min.dev_attr.attr, | |
484 | &sensor_dev_attr_in1_max.dev_attr.attr, | |
428a7039 | 485 | &sensor_dev_attr_in1_alarm.dev_attr.attr, |
247dde4c JD |
486 | &sensor_dev_attr_in2_input.dev_attr.attr, |
487 | &sensor_dev_attr_in2_min.dev_attr.attr, | |
488 | &sensor_dev_attr_in2_max.dev_attr.attr, | |
428a7039 | 489 | &sensor_dev_attr_in2_alarm.dev_attr.attr, |
247dde4c JD |
490 | &sensor_dev_attr_in3_input.dev_attr.attr, |
491 | &sensor_dev_attr_in3_min.dev_attr.attr, | |
492 | &sensor_dev_attr_in3_max.dev_attr.attr, | |
428a7039 | 493 | &sensor_dev_attr_in3_alarm.dev_attr.attr, |
247dde4c JD |
494 | &sensor_dev_attr_in4_input.dev_attr.attr, |
495 | &sensor_dev_attr_in4_min.dev_attr.attr, | |
496 | &sensor_dev_attr_in4_max.dev_attr.attr, | |
428a7039 | 497 | &sensor_dev_attr_in4_alarm.dev_attr.attr, |
247dde4c JD |
498 | &sensor_dev_attr_in5_input.dev_attr.attr, |
499 | &sensor_dev_attr_in5_min.dev_attr.attr, | |
500 | &sensor_dev_attr_in5_max.dev_attr.attr, | |
428a7039 | 501 | &sensor_dev_attr_in5_alarm.dev_attr.attr, |
247dde4c JD |
502 | &sensor_dev_attr_in6_input.dev_attr.attr, |
503 | &sensor_dev_attr_in6_min.dev_attr.attr, | |
504 | &sensor_dev_attr_in6_max.dev_attr.attr, | |
428a7039 | 505 | &sensor_dev_attr_in6_alarm.dev_attr.attr, |
c1685f61 MH |
506 | &dev_attr_temp1_input.attr, |
507 | &dev_attr_temp1_max.attr, | |
508 | &dev_attr_temp1_max_hyst.attr, | |
428a7039 | 509 | &sensor_dev_attr_temp1_alarm.dev_attr.attr, |
247dde4c JD |
510 | &sensor_dev_attr_fan1_input.dev_attr.attr, |
511 | &sensor_dev_attr_fan1_min.dev_attr.attr, | |
512 | &sensor_dev_attr_fan1_div.dev_attr.attr, | |
428a7039 | 513 | &sensor_dev_attr_fan1_alarm.dev_attr.attr, |
247dde4c JD |
514 | &sensor_dev_attr_fan2_input.dev_attr.attr, |
515 | &sensor_dev_attr_fan2_min.dev_attr.attr, | |
516 | &sensor_dev_attr_fan2_div.dev_attr.attr, | |
428a7039 | 517 | &sensor_dev_attr_fan2_alarm.dev_attr.attr, |
247dde4c JD |
518 | &sensor_dev_attr_fan3_input.dev_attr.attr, |
519 | &sensor_dev_attr_fan3_min.dev_attr.attr, | |
520 | &sensor_dev_attr_fan3_div.dev_attr.attr, | |
428a7039 | 521 | &sensor_dev_attr_fan3_alarm.dev_attr.attr, |
c1685f61 MH |
522 | &dev_attr_alarms.attr, |
523 | &dev_attr_cpu0_vid.attr, | |
524 | ||
525 | NULL | |
526 | }; | |
527 | ||
528 | static const struct attribute_group lm78_group = { | |
529 | .attrs = lm78_attributes, | |
530 | }; | |
531 | ||
c40769fe JD |
532 | /* I2C devices get this name attribute automatically, but for ISA devices |
533 | we must create it by ourselves. */ | |
534 | static ssize_t show_name(struct device *dev, struct device_attribute | |
535 | *devattr, char *buf) | |
536 | { | |
537 | struct lm78_data *data = dev_get_drvdata(dev); | |
538 | ||
539 | return sprintf(buf, "%s\n", data->client.name); | |
540 | } | |
541 | static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); | |
542 | ||
18c73f90 JD |
543 | /* Returns 1 if the I2C chip appears to be an alias of the ISA chip */ |
544 | static int lm78_alias_detect(struct i2c_client *client, u8 chipid) | |
545 | { | |
546 | struct lm78_data *i2c, *isa; | |
547 | int i; | |
548 | ||
549 | if (!pdev) /* No ISA chip */ | |
550 | return 0; | |
551 | ||
552 | i2c = i2c_get_clientdata(client); | |
553 | isa = platform_get_drvdata(pdev); | |
554 | ||
555 | if (lm78_read_value(isa, LM78_REG_I2C_ADDR) != client->addr) | |
556 | return 0; /* Address doesn't match */ | |
557 | if ((lm78_read_value(isa, LM78_REG_CHIPID) & 0xfe) != (chipid & 0xfe)) | |
558 | return 0; /* Chip type doesn't match */ | |
559 | ||
560 | /* We compare all the limit registers, the config register and the | |
561 | * interrupt mask registers */ | |
562 | for (i = 0x2b; i <= 0x3d; i++) { | |
563 | if (lm78_read_value(isa, i) != lm78_read_value(i2c, i)) | |
564 | return 0; | |
565 | } | |
566 | if (lm78_read_value(isa, LM78_REG_CONFIG) != | |
567 | lm78_read_value(i2c, LM78_REG_CONFIG)) | |
568 | return 0; | |
569 | for (i = 0x43; i <= 0x46; i++) { | |
570 | if (lm78_read_value(isa, i) != lm78_read_value(i2c, i)) | |
571 | return 0; | |
572 | } | |
573 | ||
574 | return 1; | |
575 | } | |
576 | ||
2ed2dc3c | 577 | /* This function is called by i2c_probe */ |
d8d20615 | 578 | static int lm78_detect(struct i2c_adapter *adapter, int address, int kind) |
1da177e4 LT |
579 | { |
580 | int i, err; | |
581 | struct i2c_client *new_client; | |
582 | struct lm78_data *data; | |
583 | const char *client_name = ""; | |
1da177e4 | 584 | |
c40769fe | 585 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { |
1da177e4 | 586 | err = -ENODEV; |
c40769fe | 587 | goto ERROR1; |
1da177e4 LT |
588 | } |
589 | ||
590 | /* OK. For now, we presume we have a valid client. We now create the | |
591 | client structure, even though we cannot fill it completely yet. | |
592 | But it allows us to access lm78_{read,write}_value. */ | |
593 | ||
ba9c2e8d | 594 | if (!(data = kzalloc(sizeof(struct lm78_data), GFP_KERNEL))) { |
1da177e4 LT |
595 | err = -ENOMEM; |
596 | goto ERROR1; | |
597 | } | |
1da177e4 LT |
598 | |
599 | new_client = &data->client; | |
1da177e4 LT |
600 | i2c_set_clientdata(new_client, data); |
601 | new_client->addr = address; | |
602 | new_client->adapter = adapter; | |
c40769fe | 603 | new_client->driver = &lm78_driver; |
1da177e4 LT |
604 | |
605 | /* Now, we do the remaining detection. */ | |
606 | if (kind < 0) { | |
c59cc301 | 607 | if (lm78_read_value(data, LM78_REG_CONFIG) & 0x80) { |
1da177e4 LT |
608 | err = -ENODEV; |
609 | goto ERROR2; | |
610 | } | |
c59cc301 | 611 | if (lm78_read_value(data, LM78_REG_I2C_ADDR) != |
c40769fe | 612 | address) { |
1da177e4 LT |
613 | err = -ENODEV; |
614 | goto ERROR2; | |
ad3273be JD |
615 | } |
616 | /* Explicitly prevent the misdetection of Winbond chips */ | |
617 | i = lm78_read_value(data, 0x4f); | |
618 | if (i == 0xa3 || i == 0x5c) { | |
619 | err = -ENODEV; | |
620 | goto ERROR2; | |
1da177e4 LT |
621 | } |
622 | } | |
623 | ||
624 | /* Determine the chip type. */ | |
625 | if (kind <= 0) { | |
c59cc301 | 626 | i = lm78_read_value(data, LM78_REG_CHIPID); |
27fe048e JD |
627 | if (i == 0x00 || i == 0x20 /* LM78 */ |
628 | || i == 0x40) /* LM78-J */ | |
1da177e4 | 629 | kind = lm78; |
1da177e4 LT |
630 | else if ((i & 0xfe) == 0xc0) |
631 | kind = lm79; | |
632 | else { | |
633 | if (kind == 0) | |
634 | dev_warn(&adapter->dev, "Ignoring 'force' " | |
635 | "parameter for unknown chip at " | |
636 | "adapter %d, address 0x%02x\n", | |
637 | i2c_adapter_id(adapter), address); | |
638 | err = -ENODEV; | |
639 | goto ERROR2; | |
640 | } | |
18c73f90 JD |
641 | |
642 | if (lm78_alias_detect(new_client, i)) { | |
643 | dev_dbg(&adapter->dev, "Device at 0x%02x appears to " | |
644 | "be the same as ISA device\n", address); | |
645 | err = -ENODEV; | |
646 | goto ERROR2; | |
647 | } | |
1da177e4 LT |
648 | } |
649 | ||
650 | if (kind == lm78) { | |
651 | client_name = "lm78"; | |
1da177e4 LT |
652 | } else if (kind == lm79) { |
653 | client_name = "lm79"; | |
654 | } | |
655 | ||
656 | /* Fill in the remaining client fields and put into the global list */ | |
657 | strlcpy(new_client->name, client_name, I2C_NAME_SIZE); | |
658 | data->type = kind; | |
659 | ||
1da177e4 LT |
660 | /* Tell the I2C layer a new client has arrived */ |
661 | if ((err = i2c_attach_client(new_client))) | |
662 | goto ERROR2; | |
663 | ||
664 | /* Initialize the LM78 chip */ | |
c59cc301 | 665 | lm78_init_device(data); |
1da177e4 | 666 | |
1da177e4 | 667 | /* Register sysfs hooks */ |
c1685f61 MH |
668 | if ((err = sysfs_create_group(&new_client->dev.kobj, &lm78_group))) |
669 | goto ERROR3; | |
670 | ||
1beeffe4 TJ |
671 | data->hwmon_dev = hwmon_device_register(&new_client->dev); |
672 | if (IS_ERR(data->hwmon_dev)) { | |
673 | err = PTR_ERR(data->hwmon_dev); | |
c1685f61 | 674 | goto ERROR4; |
943b0830 MH |
675 | } |
676 | ||
1da177e4 LT |
677 | return 0; |
678 | ||
c1685f61 MH |
679 | ERROR4: |
680 | sysfs_remove_group(&new_client->dev.kobj, &lm78_group); | |
943b0830 MH |
681 | ERROR3: |
682 | i2c_detach_client(new_client); | |
1da177e4 LT |
683 | ERROR2: |
684 | kfree(data); | |
685 | ERROR1: | |
1da177e4 LT |
686 | return err; |
687 | } | |
688 | ||
689 | static int lm78_detach_client(struct i2c_client *client) | |
690 | { | |
943b0830 | 691 | struct lm78_data *data = i2c_get_clientdata(client); |
1da177e4 LT |
692 | int err; |
693 | ||
1beeffe4 | 694 | hwmon_device_unregister(data->hwmon_dev); |
c1685f61 | 695 | sysfs_remove_group(&client->dev.kobj, &lm78_group); |
943b0830 | 696 | |
7bef5594 | 697 | if ((err = i2c_detach_client(client))) |
1da177e4 | 698 | return err; |
1da177e4 | 699 | |
c40769fe JD |
700 | kfree(data); |
701 | ||
702 | return 0; | |
703 | } | |
704 | ||
705 | static int __devinit lm78_isa_probe(struct platform_device *pdev) | |
706 | { | |
707 | int err; | |
708 | struct lm78_data *data; | |
709 | struct resource *res; | |
710 | const char *name; | |
711 | ||
712 | /* Reserve the ISA region */ | |
713 | res = platform_get_resource(pdev, IORESOURCE_IO, 0); | |
47c15532 | 714 | if (!request_region(res->start + LM78_ADDR_REG_OFFSET, 2, "lm78")) { |
c40769fe JD |
715 | err = -EBUSY; |
716 | goto exit; | |
717 | } | |
718 | ||
719 | if (!(data = kzalloc(sizeof(struct lm78_data), GFP_KERNEL))) { | |
720 | err = -ENOMEM; | |
721 | goto exit_release_region; | |
722 | } | |
723 | mutex_init(&data->lock); | |
724 | data->client.addr = res->start; | |
725 | i2c_set_clientdata(&data->client, data); | |
726 | platform_set_drvdata(pdev, data); | |
727 | ||
c59cc301 | 728 | if (lm78_read_value(data, LM78_REG_CHIPID) & 0x80) { |
c40769fe JD |
729 | data->type = lm79; |
730 | name = "lm79"; | |
731 | } else { | |
732 | data->type = lm78; | |
733 | name = "lm78"; | |
734 | } | |
735 | strlcpy(data->client.name, name, I2C_NAME_SIZE); | |
736 | ||
737 | /* Initialize the LM78 chip */ | |
c59cc301 | 738 | lm78_init_device(data); |
c40769fe JD |
739 | |
740 | /* Register sysfs hooks */ | |
741 | if ((err = sysfs_create_group(&pdev->dev.kobj, &lm78_group)) | |
742 | || (err = device_create_file(&pdev->dev, &dev_attr_name))) | |
743 | goto exit_remove_files; | |
744 | ||
1beeffe4 TJ |
745 | data->hwmon_dev = hwmon_device_register(&pdev->dev); |
746 | if (IS_ERR(data->hwmon_dev)) { | |
747 | err = PTR_ERR(data->hwmon_dev); | |
c40769fe JD |
748 | goto exit_remove_files; |
749 | } | |
750 | ||
751 | return 0; | |
752 | ||
753 | exit_remove_files: | |
754 | sysfs_remove_group(&pdev->dev.kobj, &lm78_group); | |
755 | device_remove_file(&pdev->dev, &dev_attr_name); | |
756 | kfree(data); | |
757 | exit_release_region: | |
47c15532 | 758 | release_region(res->start + LM78_ADDR_REG_OFFSET, 2); |
c40769fe JD |
759 | exit: |
760 | return err; | |
761 | } | |
762 | ||
763 | static int __devexit lm78_isa_remove(struct platform_device *pdev) | |
764 | { | |
765 | struct lm78_data *data = platform_get_drvdata(pdev); | |
1da177e4 | 766 | |
1beeffe4 | 767 | hwmon_device_unregister(data->hwmon_dev); |
c40769fe JD |
768 | sysfs_remove_group(&pdev->dev.kobj, &lm78_group); |
769 | device_remove_file(&pdev->dev, &dev_attr_name); | |
47c15532 | 770 | release_region(data->client.addr + LM78_ADDR_REG_OFFSET, 2); |
943b0830 | 771 | kfree(data); |
1da177e4 LT |
772 | |
773 | return 0; | |
774 | } | |
775 | ||
44bbe87e | 776 | /* The SMBus locks itself, but ISA access must be locked explicitly! |
1da177e4 LT |
777 | We don't want to lock the whole ISA bus, so we lock each client |
778 | separately. | |
779 | We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks, | |
780 | would slow down the LM78 access and should not be necessary. */ | |
c59cc301 | 781 | static int lm78_read_value(struct lm78_data *data, u8 reg) |
1da177e4 | 782 | { |
c59cc301 JD |
783 | struct i2c_client *client = &data->client; |
784 | ||
c40769fe | 785 | if (!client->driver) { /* ISA device */ |
c59cc301 | 786 | int res; |
9a61bf63 | 787 | mutex_lock(&data->lock); |
1da177e4 LT |
788 | outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET); |
789 | res = inb_p(client->addr + LM78_DATA_REG_OFFSET); | |
9a61bf63 | 790 | mutex_unlock(&data->lock); |
1da177e4 LT |
791 | return res; |
792 | } else | |
793 | return i2c_smbus_read_byte_data(client, reg); | |
794 | } | |
795 | ||
44bbe87e | 796 | /* The SMBus locks itself, but ISA access muse be locked explicitly! |
1da177e4 LT |
797 | We don't want to lock the whole ISA bus, so we lock each client |
798 | separately. | |
799 | We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks, | |
800 | would slow down the LM78 access and should not be necessary. | |
801 | There are some ugly typecasts here, but the good new is - they should | |
802 | nowhere else be necessary! */ | |
c59cc301 | 803 | static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value) |
1da177e4 | 804 | { |
c59cc301 JD |
805 | struct i2c_client *client = &data->client; |
806 | ||
c40769fe | 807 | if (!client->driver) { /* ISA device */ |
9a61bf63 | 808 | mutex_lock(&data->lock); |
1da177e4 LT |
809 | outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET); |
810 | outb_p(value, client->addr + LM78_DATA_REG_OFFSET); | |
9a61bf63 | 811 | mutex_unlock(&data->lock); |
1da177e4 LT |
812 | return 0; |
813 | } else | |
814 | return i2c_smbus_write_byte_data(client, reg, value); | |
815 | } | |
816 | ||
c59cc301 | 817 | static void lm78_init_device(struct lm78_data *data) |
1da177e4 | 818 | { |
c40769fe JD |
819 | u8 config; |
820 | int i; | |
1da177e4 LT |
821 | |
822 | /* Start monitoring */ | |
c59cc301 | 823 | config = lm78_read_value(data, LM78_REG_CONFIG); |
c40769fe | 824 | if ((config & 0x09) != 0x01) |
c59cc301 | 825 | lm78_write_value(data, LM78_REG_CONFIG, |
1da177e4 | 826 | (config & 0xf7) | 0x01); |
c40769fe JD |
827 | |
828 | /* A few vars need to be filled upon startup */ | |
829 | for (i = 0; i < 3; i++) { | |
c59cc301 | 830 | data->fan_min[i] = lm78_read_value(data, |
c40769fe JD |
831 | LM78_REG_FAN_MIN(i)); |
832 | } | |
833 | ||
834 | mutex_init(&data->update_lock); | |
1da177e4 LT |
835 | } |
836 | ||
837 | static struct lm78_data *lm78_update_device(struct device *dev) | |
838 | { | |
c40769fe | 839 | struct lm78_data *data = dev_get_drvdata(dev); |
1da177e4 LT |
840 | int i; |
841 | ||
9a61bf63 | 842 | mutex_lock(&data->update_lock); |
1da177e4 LT |
843 | |
844 | if (time_after(jiffies, data->last_updated + HZ + HZ / 2) | |
845 | || !data->valid) { | |
846 | ||
c40769fe | 847 | dev_dbg(dev, "Starting lm78 update\n"); |
1da177e4 LT |
848 | |
849 | for (i = 0; i <= 6; i++) { | |
850 | data->in[i] = | |
c59cc301 | 851 | lm78_read_value(data, LM78_REG_IN(i)); |
1da177e4 | 852 | data->in_min[i] = |
c59cc301 | 853 | lm78_read_value(data, LM78_REG_IN_MIN(i)); |
1da177e4 | 854 | data->in_max[i] = |
c59cc301 | 855 | lm78_read_value(data, LM78_REG_IN_MAX(i)); |
1da177e4 LT |
856 | } |
857 | for (i = 0; i < 3; i++) { | |
858 | data->fan[i] = | |
c59cc301 | 859 | lm78_read_value(data, LM78_REG_FAN(i)); |
1da177e4 | 860 | data->fan_min[i] = |
c59cc301 | 861 | lm78_read_value(data, LM78_REG_FAN_MIN(i)); |
1da177e4 | 862 | } |
c59cc301 | 863 | data->temp = lm78_read_value(data, LM78_REG_TEMP); |
1da177e4 | 864 | data->temp_over = |
c59cc301 | 865 | lm78_read_value(data, LM78_REG_TEMP_OVER); |
1da177e4 | 866 | data->temp_hyst = |
c59cc301 JD |
867 | lm78_read_value(data, LM78_REG_TEMP_HYST); |
868 | i = lm78_read_value(data, LM78_REG_VID_FANDIV); | |
1da177e4 LT |
869 | data->vid = i & 0x0f; |
870 | if (data->type == lm79) | |
871 | data->vid |= | |
c59cc301 | 872 | (lm78_read_value(data, LM78_REG_CHIPID) & |
1da177e4 LT |
873 | 0x01) << 4; |
874 | else | |
875 | data->vid |= 0x10; | |
876 | data->fan_div[0] = (i >> 4) & 0x03; | |
877 | data->fan_div[1] = i >> 6; | |
c59cc301 JD |
878 | data->alarms = lm78_read_value(data, LM78_REG_ALARM1) + |
879 | (lm78_read_value(data, LM78_REG_ALARM2) << 8); | |
1da177e4 LT |
880 | data->last_updated = jiffies; |
881 | data->valid = 1; | |
882 | ||
883 | data->fan_div[2] = 1; | |
884 | } | |
885 | ||
9a61bf63 | 886 | mutex_unlock(&data->update_lock); |
1da177e4 LT |
887 | |
888 | return data; | |
889 | } | |
890 | ||
c40769fe JD |
891 | /* return 1 if a supported chip is found, 0 otherwise */ |
892 | static int __init lm78_isa_found(unsigned short address) | |
893 | { | |
894 | int val, save, found = 0; | |
895 | ||
47c15532 JD |
896 | /* We have to request the region in two parts because some |
897 | boards declare base+4 to base+7 as a PNP device */ | |
898 | if (!request_region(address, 4, "lm78")) { | |
899 | pr_debug("lm78: Failed to request low part of region\n"); | |
c40769fe | 900 | return 0; |
47c15532 JD |
901 | } |
902 | if (!request_region(address + 4, 4, "lm78")) { | |
903 | pr_debug("lm78: Failed to request high part of region\n"); | |
904 | release_region(address, 4); | |
905 | return 0; | |
906 | } | |
c40769fe JD |
907 | |
908 | #define REALLY_SLOW_IO | |
909 | /* We need the timeouts for at least some LM78-like | |
910 | chips. But only if we read 'undefined' registers. */ | |
911 | val = inb_p(address + 1); | |
912 | if (inb_p(address + 2) != val | |
913 | || inb_p(address + 3) != val | |
914 | || inb_p(address + 7) != val) | |
915 | goto release; | |
916 | #undef REALLY_SLOW_IO | |
917 | ||
918 | /* We should be able to change the 7 LSB of the address port. The | |
919 | MSB (busy flag) should be clear initially, set after the write. */ | |
920 | save = inb_p(address + LM78_ADDR_REG_OFFSET); | |
921 | if (save & 0x80) | |
922 | goto release; | |
923 | val = ~save & 0x7f; | |
924 | outb_p(val, address + LM78_ADDR_REG_OFFSET); | |
925 | if (inb_p(address + LM78_ADDR_REG_OFFSET) != (val | 0x80)) { | |
926 | outb_p(save, address + LM78_ADDR_REG_OFFSET); | |
927 | goto release; | |
928 | } | |
929 | ||
930 | /* We found a device, now see if it could be an LM78 */ | |
931 | outb_p(LM78_REG_CONFIG, address + LM78_ADDR_REG_OFFSET); | |
932 | val = inb_p(address + LM78_DATA_REG_OFFSET); | |
933 | if (val & 0x80) | |
934 | goto release; | |
935 | outb_p(LM78_REG_I2C_ADDR, address + LM78_ADDR_REG_OFFSET); | |
936 | val = inb_p(address + LM78_DATA_REG_OFFSET); | |
937 | if (val < 0x03 || val > 0x77) /* Not a valid I2C address */ | |
938 | goto release; | |
939 | ||
940 | /* The busy flag should be clear again */ | |
941 | if (inb_p(address + LM78_ADDR_REG_OFFSET) & 0x80) | |
942 | goto release; | |
943 | ||
944 | /* Explicitly prevent the misdetection of Winbond chips */ | |
945 | outb_p(0x4f, address + LM78_ADDR_REG_OFFSET); | |
946 | val = inb_p(address + LM78_DATA_REG_OFFSET); | |
947 | if (val == 0xa3 || val == 0x5c) | |
948 | goto release; | |
949 | ||
950 | /* Explicitly prevent the misdetection of ITE chips */ | |
951 | outb_p(0x58, address + LM78_ADDR_REG_OFFSET); | |
952 | val = inb_p(address + LM78_DATA_REG_OFFSET); | |
953 | if (val == 0x90) | |
954 | goto release; | |
955 | ||
956 | /* Determine the chip type */ | |
957 | outb_p(LM78_REG_CHIPID, address + LM78_ADDR_REG_OFFSET); | |
958 | val = inb_p(address + LM78_DATA_REG_OFFSET); | |
acf346a3 | 959 | if (val == 0x00 || val == 0x20 /* LM78 */ |
c40769fe JD |
960 | || val == 0x40 /* LM78-J */ |
961 | || (val & 0xfe) == 0xc0) /* LM79 */ | |
962 | found = 1; | |
963 | ||
964 | if (found) | |
965 | pr_info("lm78: Found an %s chip at %#x\n", | |
966 | val & 0x80 ? "LM79" : "LM78", (int)address); | |
967 | ||
968 | release: | |
47c15532 JD |
969 | release_region(address + 4, 4); |
970 | release_region(address, 4); | |
c40769fe JD |
971 | return found; |
972 | } | |
973 | ||
974 | static int __init lm78_isa_device_add(unsigned short address) | |
975 | { | |
976 | struct resource res = { | |
977 | .start = address, | |
15bde2f1 | 978 | .end = address + LM78_EXTENT - 1, |
c40769fe JD |
979 | .name = "lm78", |
980 | .flags = IORESOURCE_IO, | |
981 | }; | |
982 | int err; | |
983 | ||
984 | pdev = platform_device_alloc("lm78", address); | |
985 | if (!pdev) { | |
986 | err = -ENOMEM; | |
987 | printk(KERN_ERR "lm78: Device allocation failed\n"); | |
988 | goto exit; | |
989 | } | |
990 | ||
991 | err = platform_device_add_resources(pdev, &res, 1); | |
992 | if (err) { | |
993 | printk(KERN_ERR "lm78: Device resource addition failed " | |
994 | "(%d)\n", err); | |
995 | goto exit_device_put; | |
996 | } | |
997 | ||
998 | err = platform_device_add(pdev); | |
999 | if (err) { | |
1000 | printk(KERN_ERR "lm78: Device addition failed (%d)\n", | |
1001 | err); | |
1002 | goto exit_device_put; | |
1003 | } | |
1004 | ||
1005 | return 0; | |
1006 | ||
1007 | exit_device_put: | |
1008 | platform_device_put(pdev); | |
1009 | exit: | |
1010 | pdev = NULL; | |
1011 | return err; | |
1012 | } | |
1013 | ||
1da177e4 LT |
1014 | static int __init sm_lm78_init(void) |
1015 | { | |
fde09509 JD |
1016 | int res; |
1017 | ||
18c73f90 JD |
1018 | /* We register the ISA device first, so that we can skip the |
1019 | * registration of an I2C interface to the same device. */ | |
c40769fe JD |
1020 | if (lm78_isa_found(isa_address)) { |
1021 | res = platform_driver_register(&lm78_isa_driver); | |
1022 | if (res) | |
18c73f90 | 1023 | goto exit; |
fde09509 | 1024 | |
c40769fe JD |
1025 | /* Sets global pdev as a side effect */ |
1026 | res = lm78_isa_device_add(isa_address); | |
1027 | if (res) | |
1028 | goto exit_unreg_isa_driver; | |
1029 | } | |
fde09509 | 1030 | |
18c73f90 JD |
1031 | res = i2c_add_driver(&lm78_driver); |
1032 | if (res) | |
1033 | goto exit_unreg_isa_device; | |
1034 | ||
fde09509 | 1035 | return 0; |
c40769fe | 1036 | |
18c73f90 JD |
1037 | exit_unreg_isa_device: |
1038 | platform_device_unregister(pdev); | |
c40769fe JD |
1039 | exit_unreg_isa_driver: |
1040 | platform_driver_unregister(&lm78_isa_driver); | |
c40769fe JD |
1041 | exit: |
1042 | return res; | |
1da177e4 LT |
1043 | } |
1044 | ||
1045 | static void __exit sm_lm78_exit(void) | |
1046 | { | |
c40769fe JD |
1047 | if (pdev) { |
1048 | platform_device_unregister(pdev); | |
1049 | platform_driver_unregister(&lm78_isa_driver); | |
1050 | } | |
1da177e4 LT |
1051 | i2c_del_driver(&lm78_driver); |
1052 | } | |
1053 | ||
1054 | ||
1055 | ||
1056 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>"); | |
27fe048e | 1057 | MODULE_DESCRIPTION("LM78/LM79 driver"); |
1da177e4 LT |
1058 | MODULE_LICENSE("GPL"); |
1059 | ||
1060 | module_init(sm_lm78_init); | |
1061 | module_exit(sm_lm78_exit); |