1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * lm78.c - Part of lm_sensors, Linux kernel modules for hardware |
4 | * monitoring |
5 | * Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> |
6 | * Copyright (c) 2007, 2011 Jean Delvare <jdelvare@suse.de> |
7 | */ |
8 | |
9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
10 | |
11 | #include <linux/module.h> |
12 | #include <linux/init.h> |
13 | #include <linux/slab.h> |
14 | #include <linux/jiffies.h> |
15 | #include <linux/i2c.h> |
16 | #include <linux/hwmon.h> |
17 | #include <linux/hwmon-vid.h> |
18 | #include <linux/hwmon-sysfs.h> |
19 | #include <linux/err.h> |
20 | #include <linux/mutex.h> |
21 | |
22 | #ifdef CONFIG_ISA |
23 | #include <linux/platform_device.h> |
24 | #include <linux/ioport.h> |
25 | #include <linux/io.h> |
26 | #endif |
27 | |
28 | /* Addresses to scan */ |
29 | static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, |
30 | 0x2e, 0x2f, I2C_CLIENT_END }; |
31 | enum chips { lm78, lm79 }; |
32 | |
33 | /* Many LM78 constants specified below */ |
34 | |
35 | /* Length of ISA address segment */ |
36 | #define LM78_EXTENT 8 |
37 | |
38 | /* Where are the ISA address/data registers relative to the base address */ |
39 | #define LM78_ADDR_REG_OFFSET 5 |
40 | #define LM78_DATA_REG_OFFSET 6 |
41 | |
42 | /* The LM78 registers */ |
43 | #define LM78_REG_IN_MAX(nr) (0x2b + (nr) * 2) |
44 | #define LM78_REG_IN_MIN(nr) (0x2c + (nr) * 2) |
45 | #define LM78_REG_IN(nr) (0x20 + (nr)) |
46 | |
47 | #define LM78_REG_FAN_MIN(nr) (0x3b + (nr)) |
48 | #define LM78_REG_FAN(nr) (0x28 + (nr)) |
49 | |
50 | #define LM78_REG_TEMP 0x27 |
51 | #define LM78_REG_TEMP_OVER 0x39 |
52 | #define LM78_REG_TEMP_HYST 0x3a |
53 | |
54 | #define LM78_REG_ALARM1 0x41 |
55 | #define LM78_REG_ALARM2 0x42 |
56 | |
57 | #define LM78_REG_VID_FANDIV 0x47 |
58 | |
59 | #define LM78_REG_CONFIG 0x40 |
60 | #define LM78_REG_CHIPID 0x49 |
61 | #define LM78_REG_I2C_ADDR 0x48 |
62 | |
63 | /* |
64 | * Conversions. Rounding and limit checking is only done on the TO_REG |
65 | * variants. |
66 | */ |
67 | |
68 | /* |
69 | * IN: mV (0V to 4.08V) |
70 | * REG: 16mV/bit |
71 | */ |
72 | static inline u8 IN_TO_REG(unsigned long val) |
73 | { |
74 | unsigned long nval = clamp_val(val, 0, 4080); |
75 | return (nval + 8) / 16; |
76 | } |
77 | #define IN_FROM_REG(val) ((val) * 16) |
78 | |
79 | static inline u8 FAN_TO_REG(long rpm, int div) |
80 | { |
81 | if (rpm <= 0) |
82 | return 255; |
83 | if (rpm > 1350000) |
84 | return 1; |
85 | return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254); |
86 | } |
87 | |
88 | static inline int FAN_FROM_REG(u8 val, int div) |
89 | { |
90 | return val == 0 ? -1 : val == 255 ? 0 : 1350000 / (val * div); |
91 | } |
92 | |
93 | /* |
94 | * TEMP: mC (-128C to +127C) |
95 | * REG: 1C/bit, two's complement |
96 | */ |
97 | static inline s8 TEMP_TO_REG(long val) |
98 | { |
99 | int nval = clamp_val(val, -128000, 127000) ; |
100 | return nval < 0 ? (nval - 500) / 1000 : (nval + 500) / 1000; |
101 | } |
102 | |
103 | static inline int TEMP_FROM_REG(s8 val) |
104 | { |
105 | return val * 1000; |
106 | } |
107 | |
108 | #define DIV_FROM_REG(val) (1 << (val)) |
109 | |
110 | struct lm78_data { |
111 | struct i2c_client *client; |
112 | struct mutex lock; |
113 | enum chips type; |
114 | |
115 | /* For ISA device only */ |
116 | const char *name; |
117 | int isa_addr; |
118 | |
119 | struct mutex update_lock; |
120 | bool valid; /* true if following fields are valid */ |
121 | unsigned long last_updated; /* In jiffies */ |
122 | |
123 | u8 in[7]; /* Register value */ |
124 | u8 in_max[7]; /* Register value */ |
125 | u8 in_min[7]; /* Register value */ |
126 | u8 fan[3]; /* Register value */ |
127 | u8 fan_min[3]; /* Register value */ |
128 | s8 temp; /* Register value */ |
129 | s8 temp_over; /* Register value */ |
130 | s8 temp_hyst; /* Register value */ |
131 | u8 fan_div[3]; /* Register encoding, shifted right */ |
132 | u8 vid; /* Register encoding, combined */ |
133 | u16 alarms; /* Register encoding, combined */ |
134 | }; |
135 | |
136 | static int lm78_read_value(struct lm78_data *data, u8 reg); |
137 | static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value); |
138 | static struct lm78_data *lm78_update_device(struct device *dev); |
139 | static void lm78_init_device(struct lm78_data *data); |
140 | |
141 | /* 7 Voltages */ |
142 | static ssize_t in_show(struct device *dev, struct device_attribute *da, |
143 | char *buf) |
144 | { |
145 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
146 | struct lm78_data *data = lm78_update_device(dev); |
147 | return sprintf(buf, fmt: "%d\n" , IN_FROM_REG(data->in[attr->index])); |
148 | } |
149 | |
150 | static ssize_t in_min_show(struct device *dev, struct device_attribute *da, |
151 | char *buf) |
152 | { |
153 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
154 | struct lm78_data *data = lm78_update_device(dev); |
155 | return sprintf(buf, fmt: "%d\n" , IN_FROM_REG(data->in_min[attr->index])); |
156 | } |
157 | |
158 | static ssize_t in_max_show(struct device *dev, struct device_attribute *da, |
159 | char *buf) |
160 | { |
161 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
162 | struct lm78_data *data = lm78_update_device(dev); |
163 | return sprintf(buf, fmt: "%d\n" , IN_FROM_REG(data->in_max[attr->index])); |
164 | } |
165 | |
166 | static ssize_t in_min_store(struct device *dev, struct device_attribute *da, |
167 | const char *buf, size_t count) |
168 | { |
169 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
170 | struct lm78_data *data = dev_get_drvdata(dev); |
171 | int nr = attr->index; |
172 | unsigned long val; |
173 | int err; |
174 | |
175 | err = kstrtoul(s: buf, base: 10, res: &val); |
176 | if (err) |
177 | return err; |
178 | |
179 | mutex_lock(&data->update_lock); |
180 | data->in_min[nr] = IN_TO_REG(val); |
181 | lm78_write_value(data, LM78_REG_IN_MIN(nr), value: data->in_min[nr]); |
182 | mutex_unlock(lock: &data->update_lock); |
183 | return count; |
184 | } |
185 | |
186 | static ssize_t in_max_store(struct device *dev, struct device_attribute *da, |
187 | const char *buf, size_t count) |
188 | { |
189 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
190 | struct lm78_data *data = dev_get_drvdata(dev); |
191 | int nr = attr->index; |
192 | unsigned long val; |
193 | int err; |
194 | |
195 | err = kstrtoul(s: buf, base: 10, res: &val); |
196 | if (err) |
197 | return err; |
198 | |
199 | mutex_lock(&data->update_lock); |
200 | data->in_max[nr] = IN_TO_REG(val); |
201 | lm78_write_value(data, LM78_REG_IN_MAX(nr), value: data->in_max[nr]); |
202 | mutex_unlock(lock: &data->update_lock); |
203 | return count; |
204 | } |
205 | |
206 | static SENSOR_DEVICE_ATTR_RO(in0_input, in, 0); |
207 | static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0); |
208 | static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0); |
209 | static SENSOR_DEVICE_ATTR_RO(in1_input, in, 1); |
210 | static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1); |
211 | static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1); |
212 | static SENSOR_DEVICE_ATTR_RO(in2_input, in, 2); |
213 | static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2); |
214 | static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2); |
215 | static SENSOR_DEVICE_ATTR_RO(in3_input, in, 3); |
216 | static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3); |
217 | static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3); |
218 | static SENSOR_DEVICE_ATTR_RO(in4_input, in, 4); |
219 | static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4); |
220 | static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4); |
221 | static SENSOR_DEVICE_ATTR_RO(in5_input, in, 5); |
222 | static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5); |
223 | static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5); |
224 | static SENSOR_DEVICE_ATTR_RO(in6_input, in, 6); |
225 | static SENSOR_DEVICE_ATTR_RW(in6_min, in_min, 6); |
226 | static SENSOR_DEVICE_ATTR_RW(in6_max, in_max, 6); |
227 | |
228 | /* Temperature */ |
229 | static ssize_t temp1_input_show(struct device *dev, |
230 | struct device_attribute *da, char *buf) |
231 | { |
232 | struct lm78_data *data = lm78_update_device(dev); |
233 | return sprintf(buf, fmt: "%d\n" , TEMP_FROM_REG(val: data->temp)); |
234 | } |
235 | |
236 | static ssize_t temp1_max_show(struct device *dev, struct device_attribute *da, |
237 | char *buf) |
238 | { |
239 | struct lm78_data *data = lm78_update_device(dev); |
240 | return sprintf(buf, fmt: "%d\n" , TEMP_FROM_REG(val: data->temp_over)); |
241 | } |
242 | |
243 | static ssize_t temp1_max_store(struct device *dev, |
244 | struct device_attribute *da, const char *buf, |
245 | size_t count) |
246 | { |
247 | struct lm78_data *data = dev_get_drvdata(dev); |
248 | long val; |
249 | int err; |
250 | |
251 | err = kstrtol(s: buf, base: 10, res: &val); |
252 | if (err) |
253 | return err; |
254 | |
255 | mutex_lock(&data->update_lock); |
256 | data->temp_over = TEMP_TO_REG(val); |
257 | lm78_write_value(data, LM78_REG_TEMP_OVER, value: data->temp_over); |
258 | mutex_unlock(lock: &data->update_lock); |
259 | return count; |
260 | } |
261 | |
262 | static ssize_t temp1_max_hyst_show(struct device *dev, |
263 | struct device_attribute *da, char *buf) |
264 | { |
265 | struct lm78_data *data = lm78_update_device(dev); |
266 | return sprintf(buf, fmt: "%d\n" , TEMP_FROM_REG(val: data->temp_hyst)); |
267 | } |
268 | |
269 | static ssize_t temp1_max_hyst_store(struct device *dev, |
270 | struct device_attribute *da, |
271 | const char *buf, size_t count) |
272 | { |
273 | struct lm78_data *data = dev_get_drvdata(dev); |
274 | long val; |
275 | int err; |
276 | |
277 | err = kstrtol(s: buf, base: 10, res: &val); |
278 | if (err) |
279 | return err; |
280 | |
281 | mutex_lock(&data->update_lock); |
282 | data->temp_hyst = TEMP_TO_REG(val); |
283 | lm78_write_value(data, LM78_REG_TEMP_HYST, value: data->temp_hyst); |
284 | mutex_unlock(lock: &data->update_lock); |
285 | return count; |
286 | } |
287 | |
288 | static DEVICE_ATTR_RO(temp1_input); |
289 | static DEVICE_ATTR_RW(temp1_max); |
290 | static DEVICE_ATTR_RW(temp1_max_hyst); |
291 | |
292 | /* 3 Fans */ |
293 | static ssize_t fan_show(struct device *dev, struct device_attribute *da, |
294 | char *buf) |
295 | { |
296 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
297 | struct lm78_data *data = lm78_update_device(dev); |
298 | int nr = attr->index; |
299 | return sprintf(buf, fmt: "%d\n" , FAN_FROM_REG(val: data->fan[nr], |
300 | DIV_FROM_REG(data->fan_div[nr]))); |
301 | } |
302 | |
303 | static ssize_t fan_min_show(struct device *dev, struct device_attribute *da, |
304 | char *buf) |
305 | { |
306 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
307 | struct lm78_data *data = lm78_update_device(dev); |
308 | int nr = attr->index; |
309 | return sprintf(buf, fmt: "%d\n" , FAN_FROM_REG(val: data->fan_min[nr], |
310 | DIV_FROM_REG(data->fan_div[nr]))); |
311 | } |
312 | |
313 | static ssize_t fan_min_store(struct device *dev, struct device_attribute *da, |
314 | const char *buf, size_t count) |
315 | { |
316 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
317 | struct lm78_data *data = dev_get_drvdata(dev); |
318 | int nr = attr->index; |
319 | unsigned long val; |
320 | int err; |
321 | |
322 | err = kstrtoul(s: buf, base: 10, res: &val); |
323 | if (err) |
324 | return err; |
325 | |
326 | mutex_lock(&data->update_lock); |
327 | data->fan_min[nr] = FAN_TO_REG(rpm: val, DIV_FROM_REG(data->fan_div[nr])); |
328 | lm78_write_value(data, LM78_REG_FAN_MIN(nr), value: data->fan_min[nr]); |
329 | mutex_unlock(lock: &data->update_lock); |
330 | return count; |
331 | } |
332 | |
333 | static ssize_t fan_div_show(struct device *dev, struct device_attribute *da, |
334 | char *buf) |
335 | { |
336 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
337 | struct lm78_data *data = lm78_update_device(dev); |
338 | return sprintf(buf, fmt: "%d\n" , DIV_FROM_REG(data->fan_div[attr->index])); |
339 | } |
340 | |
341 | /* |
342 | * Note: we save and restore the fan minimum here, because its value is |
343 | * determined in part by the fan divisor. This follows the principle of |
344 | * least surprise; the user doesn't expect the fan minimum to change just |
345 | * because the divisor changed. |
346 | */ |
347 | static ssize_t fan_div_store(struct device *dev, struct device_attribute *da, |
348 | const char *buf, size_t count) |
349 | { |
350 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
351 | struct lm78_data *data = dev_get_drvdata(dev); |
352 | int nr = attr->index; |
353 | unsigned long min; |
354 | u8 reg; |
355 | unsigned long val; |
356 | int err; |
357 | |
358 | err = kstrtoul(s: buf, base: 10, res: &val); |
359 | if (err) |
360 | return err; |
361 | |
362 | mutex_lock(&data->update_lock); |
363 | min = FAN_FROM_REG(val: data->fan_min[nr], |
364 | DIV_FROM_REG(data->fan_div[nr])); |
365 | |
366 | switch (val) { |
367 | case 1: |
368 | data->fan_div[nr] = 0; |
369 | break; |
370 | case 2: |
371 | data->fan_div[nr] = 1; |
372 | break; |
373 | case 4: |
374 | data->fan_div[nr] = 2; |
375 | break; |
376 | case 8: |
377 | data->fan_div[nr] = 3; |
378 | break; |
379 | default: |
380 | dev_err(dev, |
381 | "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n" , |
382 | val); |
383 | mutex_unlock(lock: &data->update_lock); |
384 | return -EINVAL; |
385 | } |
386 | |
387 | reg = lm78_read_value(data, LM78_REG_VID_FANDIV); |
388 | switch (nr) { |
389 | case 0: |
390 | reg = (reg & 0xcf) | (data->fan_div[nr] << 4); |
391 | break; |
392 | case 1: |
393 | reg = (reg & 0x3f) | (data->fan_div[nr] << 6); |
394 | break; |
395 | } |
396 | lm78_write_value(data, LM78_REG_VID_FANDIV, value: reg); |
397 | |
398 | data->fan_min[nr] = |
399 | FAN_TO_REG(rpm: min, DIV_FROM_REG(data->fan_div[nr])); |
400 | lm78_write_value(data, LM78_REG_FAN_MIN(nr), value: data->fan_min[nr]); |
401 | mutex_unlock(lock: &data->update_lock); |
402 | |
403 | return count; |
404 | } |
405 | |
406 | static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0); |
407 | static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0); |
408 | static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1); |
409 | static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1); |
410 | static SENSOR_DEVICE_ATTR_RO(fan3_input, fan, 2); |
411 | static SENSOR_DEVICE_ATTR_RW(fan3_min, fan_min, 2); |
412 | |
413 | /* Fan 3 divisor is locked in H/W */ |
414 | static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0); |
415 | static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1); |
416 | static SENSOR_DEVICE_ATTR_RO(fan3_div, fan_div, 2); |
417 | |
418 | /* VID */ |
419 | static ssize_t cpu0_vid_show(struct device *dev, struct device_attribute *da, |
420 | char *buf) |
421 | { |
422 | struct lm78_data *data = lm78_update_device(dev); |
423 | return sprintf(buf, fmt: "%d\n" , vid_from_reg(val: data->vid, vrm: 82)); |
424 | } |
425 | static DEVICE_ATTR_RO(cpu0_vid); |
426 | |
427 | /* Alarms */ |
428 | static ssize_t alarms_show(struct device *dev, struct device_attribute *da, |
429 | char *buf) |
430 | { |
431 | struct lm78_data *data = lm78_update_device(dev); |
432 | return sprintf(buf, fmt: "%u\n" , data->alarms); |
433 | } |
434 | static DEVICE_ATTR_RO(alarms); |
435 | |
436 | static ssize_t alarm_show(struct device *dev, struct device_attribute *da, |
437 | char *buf) |
438 | { |
439 | struct lm78_data *data = lm78_update_device(dev); |
440 | int nr = to_sensor_dev_attr(da)->index; |
441 | return sprintf(buf, fmt: "%u\n" , (data->alarms >> nr) & 1); |
442 | } |
443 | static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0); |
444 | static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1); |
445 | static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2); |
446 | static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3); |
447 | static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8); |
448 | static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 9); |
449 | static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 10); |
450 | static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6); |
451 | static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7); |
452 | static SENSOR_DEVICE_ATTR_RO(fan3_alarm, alarm, 11); |
453 | static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4); |
454 | |
455 | static struct attribute *lm78_attrs[] = { |
456 | &sensor_dev_attr_in0_input.dev_attr.attr, |
457 | &sensor_dev_attr_in0_min.dev_attr.attr, |
458 | &sensor_dev_attr_in0_max.dev_attr.attr, |
459 | &sensor_dev_attr_in0_alarm.dev_attr.attr, |
460 | &sensor_dev_attr_in1_input.dev_attr.attr, |
461 | &sensor_dev_attr_in1_min.dev_attr.attr, |
462 | &sensor_dev_attr_in1_max.dev_attr.attr, |
463 | &sensor_dev_attr_in1_alarm.dev_attr.attr, |
464 | &sensor_dev_attr_in2_input.dev_attr.attr, |
465 | &sensor_dev_attr_in2_min.dev_attr.attr, |
466 | &sensor_dev_attr_in2_max.dev_attr.attr, |
467 | &sensor_dev_attr_in2_alarm.dev_attr.attr, |
468 | &sensor_dev_attr_in3_input.dev_attr.attr, |
469 | &sensor_dev_attr_in3_min.dev_attr.attr, |
470 | &sensor_dev_attr_in3_max.dev_attr.attr, |
471 | &sensor_dev_attr_in3_alarm.dev_attr.attr, |
472 | &sensor_dev_attr_in4_input.dev_attr.attr, |
473 | &sensor_dev_attr_in4_min.dev_attr.attr, |
474 | &sensor_dev_attr_in4_max.dev_attr.attr, |
475 | &sensor_dev_attr_in4_alarm.dev_attr.attr, |
476 | &sensor_dev_attr_in5_input.dev_attr.attr, |
477 | &sensor_dev_attr_in5_min.dev_attr.attr, |
478 | &sensor_dev_attr_in5_max.dev_attr.attr, |
479 | &sensor_dev_attr_in5_alarm.dev_attr.attr, |
480 | &sensor_dev_attr_in6_input.dev_attr.attr, |
481 | &sensor_dev_attr_in6_min.dev_attr.attr, |
482 | &sensor_dev_attr_in6_max.dev_attr.attr, |
483 | &sensor_dev_attr_in6_alarm.dev_attr.attr, |
484 | &dev_attr_temp1_input.attr, |
485 | &dev_attr_temp1_max.attr, |
486 | &dev_attr_temp1_max_hyst.attr, |
487 | &sensor_dev_attr_temp1_alarm.dev_attr.attr, |
488 | &sensor_dev_attr_fan1_input.dev_attr.attr, |
489 | &sensor_dev_attr_fan1_min.dev_attr.attr, |
490 | &sensor_dev_attr_fan1_div.dev_attr.attr, |
491 | &sensor_dev_attr_fan1_alarm.dev_attr.attr, |
492 | &sensor_dev_attr_fan2_input.dev_attr.attr, |
493 | &sensor_dev_attr_fan2_min.dev_attr.attr, |
494 | &sensor_dev_attr_fan2_div.dev_attr.attr, |
495 | &sensor_dev_attr_fan2_alarm.dev_attr.attr, |
496 | &sensor_dev_attr_fan3_input.dev_attr.attr, |
497 | &sensor_dev_attr_fan3_min.dev_attr.attr, |
498 | &sensor_dev_attr_fan3_div.dev_attr.attr, |
499 | &sensor_dev_attr_fan3_alarm.dev_attr.attr, |
500 | &dev_attr_alarms.attr, |
501 | &dev_attr_cpu0_vid.attr, |
502 | |
503 | NULL |
504 | }; |
505 | |
506 | ATTRIBUTE_GROUPS(lm78); |
507 | |
508 | /* |
509 | * ISA related code |
510 | */ |
511 | #ifdef CONFIG_ISA |
512 | |
513 | /* ISA device, if found */ |
514 | static struct platform_device *pdev; |
515 | |
516 | static unsigned short isa_address = 0x290; |
517 | |
518 | static struct lm78_data *lm78_data_if_isa(void) |
519 | { |
520 | return pdev ? platform_get_drvdata(pdev) : NULL; |
521 | } |
522 | |
523 | /* Returns 1 if the I2C chip appears to be an alias of the ISA chip */ |
524 | static int lm78_alias_detect(struct i2c_client *client, u8 chipid) |
525 | { |
526 | struct lm78_data *isa; |
527 | int i; |
528 | |
529 | if (!pdev) /* No ISA chip */ |
530 | return 0; |
531 | isa = platform_get_drvdata(pdev); |
532 | |
533 | if (lm78_read_value(isa, LM78_REG_I2C_ADDR) != client->addr) |
534 | return 0; /* Address doesn't match */ |
535 | if ((lm78_read_value(isa, LM78_REG_CHIPID) & 0xfe) != (chipid & 0xfe)) |
536 | return 0; /* Chip type doesn't match */ |
537 | |
538 | /* |
539 | * We compare all the limit registers, the config register and the |
540 | * interrupt mask registers |
541 | */ |
542 | for (i = 0x2b; i <= 0x3d; i++) { |
543 | if (lm78_read_value(isa, i) != |
544 | i2c_smbus_read_byte_data(client, i)) |
545 | return 0; |
546 | } |
547 | if (lm78_read_value(isa, LM78_REG_CONFIG) != |
548 | i2c_smbus_read_byte_data(client, LM78_REG_CONFIG)) |
549 | return 0; |
550 | for (i = 0x43; i <= 0x46; i++) { |
551 | if (lm78_read_value(isa, i) != |
552 | i2c_smbus_read_byte_data(client, i)) |
553 | return 0; |
554 | } |
555 | |
556 | return 1; |
557 | } |
558 | #else /* !CONFIG_ISA */ |
559 | |
560 | static int lm78_alias_detect(struct i2c_client *client, u8 chipid) |
561 | { |
562 | return 0; |
563 | } |
564 | |
565 | static struct lm78_data *lm78_data_if_isa(void) |
566 | { |
567 | return NULL; |
568 | } |
569 | #endif /* CONFIG_ISA */ |
570 | |
571 | static int lm78_i2c_detect(struct i2c_client *client, |
572 | struct i2c_board_info *info) |
573 | { |
574 | int i; |
575 | struct lm78_data *isa = lm78_data_if_isa(); |
576 | const char *client_name; |
577 | struct i2c_adapter *adapter = client->adapter; |
578 | int address = client->addr; |
579 | |
580 | if (!i2c_check_functionality(adap: adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
581 | return -ENODEV; |
582 | |
583 | /* |
584 | * We block updates of the ISA device to minimize the risk of |
585 | * concurrent access to the same LM78 chip through different |
586 | * interfaces. |
587 | */ |
588 | if (isa) |
589 | mutex_lock(&isa->update_lock); |
590 | |
591 | if ((i2c_smbus_read_byte_data(client, LM78_REG_CONFIG) & 0x80) |
592 | || i2c_smbus_read_byte_data(client, LM78_REG_I2C_ADDR) != address) |
593 | goto err_nodev; |
594 | |
595 | /* Explicitly prevent the misdetection of Winbond chips */ |
596 | i = i2c_smbus_read_byte_data(client, command: 0x4f); |
597 | if (i == 0xa3 || i == 0x5c) |
598 | goto err_nodev; |
599 | |
600 | /* Determine the chip type. */ |
601 | i = i2c_smbus_read_byte_data(client, LM78_REG_CHIPID); |
602 | if (i == 0x00 || i == 0x20 /* LM78 */ |
603 | || i == 0x40) /* LM78-J */ |
604 | client_name = "lm78" ; |
605 | else if ((i & 0xfe) == 0xc0) |
606 | client_name = "lm79" ; |
607 | else |
608 | goto err_nodev; |
609 | |
610 | if (lm78_alias_detect(client, chipid: i)) { |
611 | dev_dbg(&adapter->dev, |
612 | "Device at 0x%02x appears to be the same as ISA device\n" , |
613 | address); |
614 | goto err_nodev; |
615 | } |
616 | |
617 | if (isa) |
618 | mutex_unlock(lock: &isa->update_lock); |
619 | |
620 | strscpy(p: info->type, q: client_name, I2C_NAME_SIZE); |
621 | |
622 | return 0; |
623 | |
624 | err_nodev: |
625 | if (isa) |
626 | mutex_unlock(lock: &isa->update_lock); |
627 | return -ENODEV; |
628 | } |
629 | |
630 | static const struct i2c_device_id lm78_i2c_id[]; |
631 | |
632 | static int lm78_i2c_probe(struct i2c_client *client) |
633 | { |
634 | struct device *dev = &client->dev; |
635 | struct device *hwmon_dev; |
636 | struct lm78_data *data; |
637 | |
638 | data = devm_kzalloc(dev, size: sizeof(struct lm78_data), GFP_KERNEL); |
639 | if (!data) |
640 | return -ENOMEM; |
641 | |
642 | data->client = client; |
643 | data->type = i2c_match_id(id: lm78_i2c_id, client)->driver_data; |
644 | |
645 | /* Initialize the LM78 chip */ |
646 | lm78_init_device(data); |
647 | |
648 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, name: client->name, |
649 | drvdata: data, groups: lm78_groups); |
650 | return PTR_ERR_OR_ZERO(ptr: hwmon_dev); |
651 | } |
652 | |
653 | static const struct i2c_device_id lm78_i2c_id[] = { |
654 | { "lm78" , lm78 }, |
655 | { "lm79" , lm79 }, |
656 | { } |
657 | }; |
658 | MODULE_DEVICE_TABLE(i2c, lm78_i2c_id); |
659 | |
660 | static struct i2c_driver lm78_driver = { |
661 | .class = I2C_CLASS_HWMON, |
662 | .driver = { |
663 | .name = "lm78" , |
664 | }, |
665 | .probe = lm78_i2c_probe, |
666 | .id_table = lm78_i2c_id, |
667 | .detect = lm78_i2c_detect, |
668 | .address_list = normal_i2c, |
669 | }; |
670 | |
671 | /* |
672 | * The SMBus locks itself, but ISA access must be locked explicitly! |
673 | * We don't want to lock the whole ISA bus, so we lock each client |
674 | * separately. |
675 | * We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks, |
676 | * would slow down the LM78 access and should not be necessary. |
677 | */ |
678 | static int lm78_read_value(struct lm78_data *data, u8 reg) |
679 | { |
680 | struct i2c_client *client = data->client; |
681 | |
682 | #ifdef CONFIG_ISA |
683 | if (!client) { /* ISA device */ |
684 | int res; |
685 | mutex_lock(&data->lock); |
686 | outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET); |
687 | res = inb_p(data->isa_addr + LM78_DATA_REG_OFFSET); |
688 | mutex_unlock(&data->lock); |
689 | return res; |
690 | } else |
691 | #endif |
692 | return i2c_smbus_read_byte_data(client, command: reg); |
693 | } |
694 | |
695 | static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value) |
696 | { |
697 | struct i2c_client *client = data->client; |
698 | |
699 | #ifdef CONFIG_ISA |
700 | if (!client) { /* ISA device */ |
701 | mutex_lock(&data->lock); |
702 | outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET); |
703 | outb_p(value, data->isa_addr + LM78_DATA_REG_OFFSET); |
704 | mutex_unlock(&data->lock); |
705 | return 0; |
706 | } else |
707 | #endif |
708 | return i2c_smbus_write_byte_data(client, command: reg, value); |
709 | } |
710 | |
711 | static void lm78_init_device(struct lm78_data *data) |
712 | { |
713 | u8 config; |
714 | int i; |
715 | |
716 | /* Start monitoring */ |
717 | config = lm78_read_value(data, LM78_REG_CONFIG); |
718 | if ((config & 0x09) != 0x01) |
719 | lm78_write_value(data, LM78_REG_CONFIG, |
720 | value: (config & 0xf7) | 0x01); |
721 | |
722 | /* A few vars need to be filled upon startup */ |
723 | for (i = 0; i < 3; i++) { |
724 | data->fan_min[i] = lm78_read_value(data, |
725 | LM78_REG_FAN_MIN(i)); |
726 | } |
727 | |
728 | mutex_init(&data->update_lock); |
729 | } |
730 | |
731 | static struct lm78_data *lm78_update_device(struct device *dev) |
732 | { |
733 | struct lm78_data *data = dev_get_drvdata(dev); |
734 | int i; |
735 | |
736 | mutex_lock(&data->update_lock); |
737 | |
738 | if (time_after(jiffies, data->last_updated + HZ + HZ / 2) |
739 | || !data->valid) { |
740 | |
741 | dev_dbg(dev, "Starting lm78 update\n" ); |
742 | |
743 | for (i = 0; i <= 6; i++) { |
744 | data->in[i] = |
745 | lm78_read_value(data, LM78_REG_IN(i)); |
746 | data->in_min[i] = |
747 | lm78_read_value(data, LM78_REG_IN_MIN(i)); |
748 | data->in_max[i] = |
749 | lm78_read_value(data, LM78_REG_IN_MAX(i)); |
750 | } |
751 | for (i = 0; i < 3; i++) { |
752 | data->fan[i] = |
753 | lm78_read_value(data, LM78_REG_FAN(i)); |
754 | data->fan_min[i] = |
755 | lm78_read_value(data, LM78_REG_FAN_MIN(i)); |
756 | } |
757 | data->temp = lm78_read_value(data, LM78_REG_TEMP); |
758 | data->temp_over = |
759 | lm78_read_value(data, LM78_REG_TEMP_OVER); |
760 | data->temp_hyst = |
761 | lm78_read_value(data, LM78_REG_TEMP_HYST); |
762 | i = lm78_read_value(data, LM78_REG_VID_FANDIV); |
763 | data->vid = i & 0x0f; |
764 | if (data->type == lm79) |
765 | data->vid |= |
766 | (lm78_read_value(data, LM78_REG_CHIPID) & |
767 | 0x01) << 4; |
768 | else |
769 | data->vid |= 0x10; |
770 | data->fan_div[0] = (i >> 4) & 0x03; |
771 | data->fan_div[1] = i >> 6; |
772 | data->alarms = lm78_read_value(data, LM78_REG_ALARM1) + |
773 | (lm78_read_value(data, LM78_REG_ALARM2) << 8); |
774 | data->last_updated = jiffies; |
775 | data->valid = true; |
776 | |
777 | data->fan_div[2] = 1; |
778 | } |
779 | |
780 | mutex_unlock(lock: &data->update_lock); |
781 | |
782 | return data; |
783 | } |
784 | |
785 | #ifdef CONFIG_ISA |
786 | static int lm78_isa_probe(struct platform_device *pdev) |
787 | { |
788 | struct device *dev = &pdev->dev; |
789 | struct device *hwmon_dev; |
790 | struct lm78_data *data; |
791 | struct resource *res; |
792 | |
793 | /* Reserve the ISA region */ |
794 | res = platform_get_resource(pdev, IORESOURCE_IO, 0); |
795 | if (!devm_request_region(dev, res->start + LM78_ADDR_REG_OFFSET, |
796 | 2, "lm78" )) |
797 | return -EBUSY; |
798 | |
799 | data = devm_kzalloc(dev, sizeof(struct lm78_data), GFP_KERNEL); |
800 | if (!data) |
801 | return -ENOMEM; |
802 | |
803 | mutex_init(&data->lock); |
804 | data->isa_addr = res->start; |
805 | platform_set_drvdata(pdev, data); |
806 | |
807 | if (lm78_read_value(data, LM78_REG_CHIPID) & 0x80) { |
808 | data->type = lm79; |
809 | data->name = "lm79" ; |
810 | } else { |
811 | data->type = lm78; |
812 | data->name = "lm78" ; |
813 | } |
814 | |
815 | /* Initialize the LM78 chip */ |
816 | lm78_init_device(data); |
817 | |
818 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, data->name, |
819 | data, lm78_groups); |
820 | return PTR_ERR_OR_ZERO(hwmon_dev); |
821 | } |
822 | |
823 | static struct platform_driver lm78_isa_driver = { |
824 | .driver = { |
825 | .name = "lm78" , |
826 | }, |
827 | .probe = lm78_isa_probe, |
828 | }; |
829 | |
830 | /* return 1 if a supported chip is found, 0 otherwise */ |
831 | static int __init lm78_isa_found(unsigned short address) |
832 | { |
833 | int val, save, found = 0; |
834 | int port; |
835 | |
836 | /* |
837 | * Some boards declare base+0 to base+7 as a PNP device, some base+4 |
838 | * to base+7 and some base+5 to base+6. So we better request each port |
839 | * individually for the probing phase. |
840 | */ |
841 | for (port = address; port < address + LM78_EXTENT; port++) { |
842 | if (!request_region(port, 1, "lm78" )) { |
843 | pr_debug("Failed to request port 0x%x\n" , port); |
844 | goto release; |
845 | } |
846 | } |
847 | |
848 | #define REALLY_SLOW_IO |
849 | /* |
850 | * We need the timeouts for at least some LM78-like |
851 | * chips. But only if we read 'undefined' registers. |
852 | */ |
853 | val = inb_p(address + 1); |
854 | if (inb_p(address + 2) != val |
855 | || inb_p(address + 3) != val |
856 | || inb_p(address + 7) != val) |
857 | goto release; |
858 | #undef REALLY_SLOW_IO |
859 | |
860 | /* |
861 | * We should be able to change the 7 LSB of the address port. The |
862 | * MSB (busy flag) should be clear initially, set after the write. |
863 | */ |
864 | save = inb_p(address + LM78_ADDR_REG_OFFSET); |
865 | if (save & 0x80) |
866 | goto release; |
867 | val = ~save & 0x7f; |
868 | outb_p(val, address + LM78_ADDR_REG_OFFSET); |
869 | if (inb_p(address + LM78_ADDR_REG_OFFSET) != (val | 0x80)) { |
870 | outb_p(save, address + LM78_ADDR_REG_OFFSET); |
871 | goto release; |
872 | } |
873 | |
874 | /* We found a device, now see if it could be an LM78 */ |
875 | outb_p(LM78_REG_CONFIG, address + LM78_ADDR_REG_OFFSET); |
876 | val = inb_p(address + LM78_DATA_REG_OFFSET); |
877 | if (val & 0x80) |
878 | goto release; |
879 | outb_p(LM78_REG_I2C_ADDR, address + LM78_ADDR_REG_OFFSET); |
880 | val = inb_p(address + LM78_DATA_REG_OFFSET); |
881 | if (val < 0x03 || val > 0x77) /* Not a valid I2C address */ |
882 | goto release; |
883 | |
884 | /* The busy flag should be clear again */ |
885 | if (inb_p(address + LM78_ADDR_REG_OFFSET) & 0x80) |
886 | goto release; |
887 | |
888 | /* Explicitly prevent the misdetection of Winbond chips */ |
889 | outb_p(0x4f, address + LM78_ADDR_REG_OFFSET); |
890 | val = inb_p(address + LM78_DATA_REG_OFFSET); |
891 | if (val == 0xa3 || val == 0x5c) |
892 | goto release; |
893 | |
894 | /* Explicitly prevent the misdetection of ITE chips */ |
895 | outb_p(0x58, address + LM78_ADDR_REG_OFFSET); |
896 | val = inb_p(address + LM78_DATA_REG_OFFSET); |
897 | if (val == 0x90) |
898 | goto release; |
899 | |
900 | /* Determine the chip type */ |
901 | outb_p(LM78_REG_CHIPID, address + LM78_ADDR_REG_OFFSET); |
902 | val = inb_p(address + LM78_DATA_REG_OFFSET); |
903 | if (val == 0x00 || val == 0x20 /* LM78 */ |
904 | || val == 0x40 /* LM78-J */ |
905 | || (val & 0xfe) == 0xc0) /* LM79 */ |
906 | found = 1; |
907 | |
908 | if (found) |
909 | pr_info("Found an %s chip at %#x\n" , |
910 | val & 0x80 ? "LM79" : "LM78" , (int)address); |
911 | |
912 | release: |
913 | for (port--; port >= address; port--) |
914 | release_region(port, 1); |
915 | return found; |
916 | } |
917 | |
918 | static int __init lm78_isa_device_add(unsigned short address) |
919 | { |
920 | struct resource res = { |
921 | .start = address, |
922 | .end = address + LM78_EXTENT - 1, |
923 | .name = "lm78" , |
924 | .flags = IORESOURCE_IO, |
925 | }; |
926 | int err; |
927 | |
928 | pdev = platform_device_alloc("lm78" , address); |
929 | if (!pdev) { |
930 | err = -ENOMEM; |
931 | pr_err("Device allocation failed\n" ); |
932 | goto exit; |
933 | } |
934 | |
935 | err = platform_device_add_resources(pdev, &res, 1); |
936 | if (err) { |
937 | pr_err("Device resource addition failed (%d)\n" , err); |
938 | goto exit_device_put; |
939 | } |
940 | |
941 | err = platform_device_add(pdev); |
942 | if (err) { |
943 | pr_err("Device addition failed (%d)\n" , err); |
944 | goto exit_device_put; |
945 | } |
946 | |
947 | return 0; |
948 | |
949 | exit_device_put: |
950 | platform_device_put(pdev); |
951 | exit: |
952 | pdev = NULL; |
953 | return err; |
954 | } |
955 | |
956 | static int __init lm78_isa_register(void) |
957 | { |
958 | int res; |
959 | |
960 | if (lm78_isa_found(isa_address)) { |
961 | res = platform_driver_register(&lm78_isa_driver); |
962 | if (res) |
963 | goto exit; |
964 | |
965 | /* Sets global pdev as a side effect */ |
966 | res = lm78_isa_device_add(isa_address); |
967 | if (res) |
968 | goto exit_unreg_isa_driver; |
969 | } |
970 | |
971 | return 0; |
972 | |
973 | exit_unreg_isa_driver: |
974 | platform_driver_unregister(&lm78_isa_driver); |
975 | exit: |
976 | return res; |
977 | } |
978 | |
979 | static void lm78_isa_unregister(void) |
980 | { |
981 | if (pdev) { |
982 | platform_device_unregister(pdev); |
983 | platform_driver_unregister(&lm78_isa_driver); |
984 | } |
985 | } |
986 | #else /* !CONFIG_ISA */ |
987 | |
988 | static int __init lm78_isa_register(void) |
989 | { |
990 | return 0; |
991 | } |
992 | |
993 | static void lm78_isa_unregister(void) |
994 | { |
995 | } |
996 | #endif /* CONFIG_ISA */ |
997 | |
998 | static int __init sm_lm78_init(void) |
999 | { |
1000 | int res; |
1001 | |
1002 | /* |
1003 | * We register the ISA device first, so that we can skip the |
1004 | * registration of an I2C interface to the same device. |
1005 | */ |
1006 | res = lm78_isa_register(); |
1007 | if (res) |
1008 | goto exit; |
1009 | |
1010 | res = i2c_add_driver(&lm78_driver); |
1011 | if (res) |
1012 | goto exit_unreg_isa_device; |
1013 | |
1014 | return 0; |
1015 | |
1016 | exit_unreg_isa_device: |
1017 | lm78_isa_unregister(); |
1018 | exit: |
1019 | return res; |
1020 | } |
1021 | |
1022 | static void __exit sm_lm78_exit(void) |
1023 | { |
1024 | lm78_isa_unregister(); |
1025 | i2c_del_driver(driver: &lm78_driver); |
1026 | } |
1027 | |
1028 | MODULE_AUTHOR("Frodo Looijaard, Jean Delvare <jdelvare@suse.de>" ); |
1029 | MODULE_DESCRIPTION("LM78/LM79 driver" ); |
1030 | MODULE_LICENSE("GPL" ); |
1031 | |
1032 | module_init(sm_lm78_init); |
1033 | module_exit(sm_lm78_exit); |
1034 | |