1 /*
2  * lm87.c
3  *
4  * Copyright (C) 2000       Frodo Looijaard <frodol@dds.nl>
5  *                          Philip Edelbrock <phil@netroedge.com>
6  *                          Stephen Rousset <stephen.rousset@rocketlogix.com>
7  *                          Dan Eaton <dan.eaton@rocketlogix.com>
8  * Copyright (C) 2004-2008  Jean Delvare <khali@linux-fr.org>
9  *
10  * Original port to Linux 2.6 by Jeff Oliver.
11  *
12  * The LM87 is a sensor chip made by National Semiconductor. It monitors up
13  * to 8 voltages (including its own power source), up to three temperatures
14  * (its own plus up to two external ones) and up to two fans. The default
15  * configuration is 6 voltages, two temperatures and two fans (see below).
16  * Voltages are scaled internally with ratios such that the nominal value of
17  * each voltage correspond to a register value of 192 (which means a
18  * resolution of about 0.5% of the nominal value). Temperature values are
19  * reported with a 1 deg resolution and a 3-4 deg accuracy. Complete
20  * datasheet can be obtained from National's website at:
21  *   http://www.national.com/pf/LM/LM87.html
22  *
23  * Some functions share pins, so not all functions are available at the same
24  * time. Which are depends on the hardware setup. This driver normally
25  * assumes that firmware configured the chip correctly. Where this is not
26  * the case, platform code must set the I2C client's platform_data to point
27  * to a u8 value to be written to the channel register.
28  * For reference, here is the list of exclusive functions:
29  *  - in0+in5 (default) or temp3
30  *  - fan1 (default) or in6
31  *  - fan2 (default) or in7
32  *  - VID lines (default) or IRQ lines (not handled by this driver)
33  *
34  * The LM87 additionally features an analog output, supposedly usable to
35  * control the speed of a fan. All new chips use pulse width modulation
36  * instead. The LM87 is the only hardware monitoring chipset I know of
37  * which uses amplitude modulation. Be careful when using this feature.
38  *
39  * This driver also supports the ADM1024, a sensor chip made by Analog
40  * Devices. That chip is fully compatible with the LM87. Complete
41  * datasheet can be obtained from Analog's website at:
42  *   http://www.analog.com/en/prod/0,2877,ADM1024,00.html
43  *
44  * This program is free software; you can redistribute it and/or modify
45  * it under the terms of the GNU General Public License as published by
46  * the Free Software Foundation; either version 2 of the License, or
47  * (at your option) any later version.
48  *
49  * This program is distributed in the hope that it will be useful,
50  * but WITHOUT ANY WARRANTY; without even the implied warranty of
51  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
52  * GNU General Public License for more details.
53  *
54  * You should have received a copy of the GNU General Public License
55  * along with this program; if not, write to the Free Software
56  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
57  */
58 
59 #include <linux/module.h>
60 #include <linux/init.h>
61 #include <linux/slab.h>
62 #include <linux/jiffies.h>
63 #include <linux/i2c.h>
64 #include <linux/hwmon.h>
65 #include <linux/hwmon-sysfs.h>
66 #include <linux/hwmon-vid.h>
67 #include <linux/err.h>
68 #include <linux/mutex.h>
69 
70 /*
71  * Addresses to scan
72  * LM87 has three possible addresses: 0x2c, 0x2d and 0x2e.
73  */
74 
75 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
76 
77 enum chips { lm87, adm1024 };
78 
79 /*
80  * The LM87 registers
81  */
82 
83 /* nr in 0..5 */
84 #define LM87_REG_IN(nr)			(0x20 + (nr))
85 #define LM87_REG_IN_MAX(nr)		(0x2B + (nr) * 2)
86 #define LM87_REG_IN_MIN(nr)		(0x2C + (nr) * 2)
87 /* nr in 0..1 */
88 #define LM87_REG_AIN(nr)		(0x28 + (nr))
89 #define LM87_REG_AIN_MIN(nr)		(0x1A + (nr))
90 #define LM87_REG_AIN_MAX(nr)		(0x3B + (nr))
91 
92 static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 };
93 static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B };
94 static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C };
95 
96 #define LM87_REG_TEMP_HW_INT_LOCK	0x13
97 #define LM87_REG_TEMP_HW_EXT_LOCK	0x14
98 #define LM87_REG_TEMP_HW_INT		0x17
99 #define LM87_REG_TEMP_HW_EXT		0x18
100 
101 /* nr in 0..1 */
102 #define LM87_REG_FAN(nr)		(0x28 + (nr))
103 #define LM87_REG_FAN_MIN(nr)		(0x3B + (nr))
104 #define LM87_REG_AOUT			0x19
105 
106 #define LM87_REG_CONFIG			0x40
107 #define LM87_REG_CHANNEL_MODE		0x16
108 #define LM87_REG_VID_FAN_DIV		0x47
109 #define LM87_REG_VID4			0x49
110 
111 #define LM87_REG_ALARMS1		0x41
112 #define LM87_REG_ALARMS2		0x42
113 
114 #define LM87_REG_COMPANY_ID		0x3E
115 #define LM87_REG_REVISION		0x3F
116 
117 /*
118  * Conversions and various macros
119  * The LM87 uses signed 8-bit values for temperatures.
120  */
121 
122 #define IN_FROM_REG(reg, scale)	(((reg) * (scale) + 96) / 192)
123 #define IN_TO_REG(val, scale)	((val) <= 0 ? 0 : \
124 				 (val) * 192 >= (scale) * 255 ? 255 : \
125 				 ((val) * 192 + (scale) / 2) / (scale))
126 
127 #define TEMP_FROM_REG(reg)	((reg) * 1000)
128 #define TEMP_TO_REG(val)	((val) <= -127500 ? -128 : \
129 				 (val) >= 126500 ? 127 : \
130 				 (((val) < 0 ? (val) - 500 : \
131 				   (val) + 500) / 1000))
132 
133 #define FAN_FROM_REG(reg, div)	((reg) == 255 || (reg) == 0 ? 0 : \
134 				 (1350000 + (reg)*(div) / 2) / ((reg) * (div)))
135 #define FAN_TO_REG(val, div)	((val) * (div) * 255 <= 1350000 ? 255 : \
136 				 (1350000 + (val)*(div) / 2) / ((val) * (div)))
137 
138 #define FAN_DIV_FROM_REG(reg)	(1 << (reg))
139 
140 /* analog out is 9.80mV/LSB */
141 #define AOUT_FROM_REG(reg)	(((reg) * 98 + 5) / 10)
142 #define AOUT_TO_REG(val)	((val) <= 0 ? 0 : \
143 				 (val) >= 2500 ? 255 : \
144 				 ((val) * 10 + 49) / 98)
145 
146 /* nr in 0..1 */
147 #define CHAN_NO_FAN(nr)		(1 << (nr))
148 #define CHAN_TEMP3		(1 << 2)
149 #define CHAN_VCC_5V		(1 << 3)
150 #define CHAN_NO_VID		(1 << 7)
151 
152 /*
153  * Client data (each client gets its own)
154  */
155 
156 struct lm87_data {
157 	struct device *hwmon_dev;
158 	struct mutex update_lock;
159 	char valid; /* zero until following fields are valid */
160 	unsigned long last_updated; /* In jiffies */
161 
162 	u8 channel;		/* register value */
163 	u8 config;		/* original register value */
164 
165 	u8 in[8];		/* register value */
166 	u8 in_max[8];		/* register value */
167 	u8 in_min[8];		/* register value */
168 	u16 in_scale[8];
169 
170 	s8 temp[3];		/* register value */
171 	s8 temp_high[3];	/* register value */
172 	s8 temp_low[3];		/* register value */
173 	s8 temp_crit_int;	/* min of two register values */
174 	s8 temp_crit_ext;	/* min of two register values */
175 
176 	u8 fan[2];		/* register value */
177 	u8 fan_min[2];		/* register value */
178 	u8 fan_div[2];		/* register value, shifted right */
179 	u8 aout;		/* register value */
180 
181 	u16 alarms;		/* register values, combined */
182 	u8 vid;			/* register values, combined */
183 	u8 vrm;
184 };
185 
lm87_read_value(struct i2c_client * client,u8 reg)186 static inline int lm87_read_value(struct i2c_client *client, u8 reg)
187 {
188 	return i2c_smbus_read_byte_data(client, reg);
189 }
190 
lm87_write_value(struct i2c_client * client,u8 reg,u8 value)191 static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value)
192 {
193 	return i2c_smbus_write_byte_data(client, reg, value);
194 }
195 
lm87_update_device(struct device * dev)196 static struct lm87_data *lm87_update_device(struct device *dev)
197 {
198 	struct i2c_client *client = to_i2c_client(dev);
199 	struct lm87_data *data = i2c_get_clientdata(client);
200 
201 	mutex_lock(&data->update_lock);
202 
203 	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
204 		int i, j;
205 
206 		dev_dbg(&client->dev, "Updating data.\n");
207 
208 		i = (data->channel & CHAN_TEMP3) ? 1 : 0;
209 		j = (data->channel & CHAN_TEMP3) ? 5 : 6;
210 		for (; i < j; i++) {
211 			data->in[i] = lm87_read_value(client,
212 				      LM87_REG_IN(i));
213 			data->in_min[i] = lm87_read_value(client,
214 					  LM87_REG_IN_MIN(i));
215 			data->in_max[i] = lm87_read_value(client,
216 					  LM87_REG_IN_MAX(i));
217 		}
218 
219 		for (i = 0; i < 2; i++) {
220 			if (data->channel & CHAN_NO_FAN(i)) {
221 				data->in[6+i] = lm87_read_value(client,
222 						LM87_REG_AIN(i));
223 				data->in_max[6+i] = lm87_read_value(client,
224 						    LM87_REG_AIN_MAX(i));
225 				data->in_min[6+i] = lm87_read_value(client,
226 						    LM87_REG_AIN_MIN(i));
227 
228 			} else {
229 				data->fan[i] = lm87_read_value(client,
230 					       LM87_REG_FAN(i));
231 				data->fan_min[i] = lm87_read_value(client,
232 						   LM87_REG_FAN_MIN(i));
233 			}
234 		}
235 
236 		j = (data->channel & CHAN_TEMP3) ? 3 : 2;
237 		for (i = 0 ; i < j; i++) {
238 			data->temp[i] = lm87_read_value(client,
239 					LM87_REG_TEMP[i]);
240 			data->temp_high[i] = lm87_read_value(client,
241 					     LM87_REG_TEMP_HIGH[i]);
242 			data->temp_low[i] = lm87_read_value(client,
243 					    LM87_REG_TEMP_LOW[i]);
244 		}
245 
246 		i = lm87_read_value(client, LM87_REG_TEMP_HW_INT_LOCK);
247 		j = lm87_read_value(client, LM87_REG_TEMP_HW_INT);
248 		data->temp_crit_int = min(i, j);
249 
250 		i = lm87_read_value(client, LM87_REG_TEMP_HW_EXT_LOCK);
251 		j = lm87_read_value(client, LM87_REG_TEMP_HW_EXT);
252 		data->temp_crit_ext = min(i, j);
253 
254 		i = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
255 		data->fan_div[0] = (i >> 4) & 0x03;
256 		data->fan_div[1] = (i >> 6) & 0x03;
257 		data->vid = (i & 0x0F)
258 			  | (lm87_read_value(client, LM87_REG_VID4) & 0x01)
259 			     << 4;
260 
261 		data->alarms = lm87_read_value(client, LM87_REG_ALARMS1)
262 			     | (lm87_read_value(client, LM87_REG_ALARMS2)
263 				<< 8);
264 		data->aout = lm87_read_value(client, LM87_REG_AOUT);
265 
266 		data->last_updated = jiffies;
267 		data->valid = 1;
268 	}
269 
270 	mutex_unlock(&data->update_lock);
271 
272 	return data;
273 }
274 
275 /*
276  * Sysfs stuff
277  */
278 
show_in_input(struct device * dev,struct device_attribute * attr,char * buf)279 static ssize_t show_in_input(struct device *dev, struct device_attribute *attr,
280 			     char *buf)
281 {
282 	struct lm87_data *data = lm87_update_device(dev);
283 	int nr = to_sensor_dev_attr(attr)->index;
284 
285 	return sprintf(buf, "%u\n", IN_FROM_REG(data->in[nr],
286 		       data->in_scale[nr]));
287 }
288 
show_in_min(struct device * dev,struct device_attribute * attr,char * buf)289 static ssize_t show_in_min(struct device *dev,
290 				     struct device_attribute *attr, char *buf)
291 {
292 	struct lm87_data *data = lm87_update_device(dev);
293 	int nr = to_sensor_dev_attr(attr)->index;
294 
295 	return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[nr],
296 		       data->in_scale[nr]));
297 }
298 
show_in_max(struct device * dev,struct device_attribute * attr,char * buf)299 static ssize_t show_in_max(struct device *dev,
300 				     struct device_attribute *attr, char *buf)
301 {
302 	struct lm87_data *data = lm87_update_device(dev);
303 	int nr = to_sensor_dev_attr(attr)->index;
304 
305 	return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[nr],
306 		       data->in_scale[nr]));
307 }
308 
set_in_min(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)309 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
310 			  const char *buf, size_t count)
311 {
312 	struct i2c_client *client = to_i2c_client(dev);
313 	struct lm87_data *data = i2c_get_clientdata(client);
314 	int nr = to_sensor_dev_attr(attr)->index;
315 	long val;
316 	int err;
317 
318 	err = kstrtol(buf, 10, &val);
319 	if (err)
320 		return err;
321 
322 	mutex_lock(&data->update_lock);
323 	data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]);
324 	lm87_write_value(client, nr < 6 ? LM87_REG_IN_MIN(nr) :
325 			 LM87_REG_AIN_MIN(nr - 6), data->in_min[nr]);
326 	mutex_unlock(&data->update_lock);
327 	return count;
328 }
329 
set_in_max(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)330 static ssize_t set_in_max(struct device *dev,  struct device_attribute *attr,
331 			  const char *buf, size_t count)
332 {
333 	struct i2c_client *client = to_i2c_client(dev);
334 	struct lm87_data *data = i2c_get_clientdata(client);
335 	int nr = to_sensor_dev_attr(attr)->index;
336 	long val;
337 	int err;
338 
339 	err = kstrtol(buf, 10, &val);
340 	if (err)
341 		return err;
342 
343 	mutex_lock(&data->update_lock);
344 	data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]);
345 	lm87_write_value(client, nr < 6 ? LM87_REG_IN_MAX(nr) :
346 			 LM87_REG_AIN_MAX(nr - 6), data->in_max[nr]);
347 	mutex_unlock(&data->update_lock);
348 	return count;
349 }
350 
351 #define set_in(offset) \
352 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
353 		show_in_input, NULL, offset); \
354 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
355 		show_in_min, set_in_min, offset); \
356 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
357 		show_in_max, set_in_max, offset)
358 set_in(0);
359 set_in(1);
360 set_in(2);
361 set_in(3);
362 set_in(4);
363 set_in(5);
364 set_in(6);
365 set_in(7);
366 
show_temp_input(struct device * dev,struct device_attribute * attr,char * buf)367 static ssize_t show_temp_input(struct device *dev,
368 			       struct device_attribute *attr, char *buf)
369 {
370 	struct lm87_data *data = lm87_update_device(dev);
371 	int nr = to_sensor_dev_attr(attr)->index;
372 
373 	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
374 }
375 
show_temp_low(struct device * dev,struct device_attribute * attr,char * buf)376 static ssize_t show_temp_low(struct device *dev,
377 			     struct device_attribute *attr, char *buf)
378 {
379 	struct lm87_data *data = lm87_update_device(dev);
380 	int nr = to_sensor_dev_attr(attr)->index;
381 
382 	return sprintf(buf, "%d\n",
383 		       TEMP_FROM_REG(data->temp_low[nr]));
384 }
385 
show_temp_high(struct device * dev,struct device_attribute * attr,char * buf)386 static ssize_t show_temp_high(struct device *dev,
387 			      struct device_attribute *attr, char *buf)
388 {
389 	struct lm87_data *data = lm87_update_device(dev);
390 	int nr = to_sensor_dev_attr(attr)->index;
391 
392 	return sprintf(buf, "%d\n",
393 		       TEMP_FROM_REG(data->temp_high[nr]));
394 }
395 
set_temp_low(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)396 static ssize_t set_temp_low(struct device *dev, struct device_attribute *attr,
397 			    const char *buf, size_t count)
398 {
399 	struct i2c_client *client = to_i2c_client(dev);
400 	struct lm87_data *data = i2c_get_clientdata(client);
401 	int nr = to_sensor_dev_attr(attr)->index;
402 	long val;
403 	int err;
404 
405 	err = kstrtol(buf, 10, &val);
406 	if (err)
407 		return err;
408 
409 	mutex_lock(&data->update_lock);
410 	data->temp_low[nr] = TEMP_TO_REG(val);
411 	lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]);
412 	mutex_unlock(&data->update_lock);
413 	return count;
414 }
415 
set_temp_high(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)416 static ssize_t set_temp_high(struct device *dev, struct device_attribute *attr,
417 			     const char *buf, size_t count)
418 {
419 	struct i2c_client *client = to_i2c_client(dev);
420 	struct lm87_data *data = i2c_get_clientdata(client);
421 	int nr = to_sensor_dev_attr(attr)->index;
422 	long val;
423 	int err;
424 
425 	err = kstrtol(buf, 10, &val);
426 	if (err)
427 		return err;
428 
429 	mutex_lock(&data->update_lock);
430 	data->temp_high[nr] = TEMP_TO_REG(val);
431 	lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]);
432 	mutex_unlock(&data->update_lock);
433 	return count;
434 }
435 
436 #define set_temp(offset) \
437 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
438 		show_temp_input, NULL, offset - 1); \
439 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
440 		show_temp_high, set_temp_high, offset - 1); \
441 static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \
442 		show_temp_low, set_temp_low, offset - 1)
443 set_temp(1);
444 set_temp(2);
445 set_temp(3);
446 
show_temp_crit_int(struct device * dev,struct device_attribute * attr,char * buf)447 static ssize_t show_temp_crit_int(struct device *dev,
448 				  struct device_attribute *attr, char *buf)
449 {
450 	struct lm87_data *data = lm87_update_device(dev);
451 	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_int));
452 }
453 
show_temp_crit_ext(struct device * dev,struct device_attribute * attr,char * buf)454 static ssize_t show_temp_crit_ext(struct device *dev,
455 				  struct device_attribute *attr, char *buf)
456 {
457 	struct lm87_data *data = lm87_update_device(dev);
458 	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext));
459 }
460 
461 static DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit_int, NULL);
462 static DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp_crit_ext, NULL);
463 static DEVICE_ATTR(temp3_crit, S_IRUGO, show_temp_crit_ext, NULL);
464 
show_fan_input(struct device * dev,struct device_attribute * attr,char * buf)465 static ssize_t show_fan_input(struct device *dev,
466 			      struct device_attribute *attr, char *buf)
467 {
468 	struct lm87_data *data = lm87_update_device(dev);
469 	int nr = to_sensor_dev_attr(attr)->index;
470 
471 	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
472 		       FAN_DIV_FROM_REG(data->fan_div[nr])));
473 }
474 
show_fan_min(struct device * dev,struct device_attribute * attr,char * buf)475 static ssize_t show_fan_min(struct device *dev,
476 			    struct device_attribute *attr, char *buf)
477 {
478 	struct lm87_data *data = lm87_update_device(dev);
479 	int nr = to_sensor_dev_attr(attr)->index;
480 
481 	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
482 		       FAN_DIV_FROM_REG(data->fan_div[nr])));
483 }
484 
show_fan_div(struct device * dev,struct device_attribute * attr,char * buf)485 static ssize_t show_fan_div(struct device *dev,
486 			    struct device_attribute *attr, char *buf)
487 {
488 	struct lm87_data *data = lm87_update_device(dev);
489 	int nr = to_sensor_dev_attr(attr)->index;
490 
491 	return sprintf(buf, "%d\n",
492 		       FAN_DIV_FROM_REG(data->fan_div[nr]));
493 }
494 
set_fan_min(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)495 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
496 			   const char *buf, size_t count)
497 {
498 	struct i2c_client *client = to_i2c_client(dev);
499 	struct lm87_data *data = i2c_get_clientdata(client);
500 	int nr = to_sensor_dev_attr(attr)->index;
501 	long val;
502 	int err;
503 
504 	err = kstrtol(buf, 10, &val);
505 	if (err)
506 		return err;
507 
508 	mutex_lock(&data->update_lock);
509 	data->fan_min[nr] = FAN_TO_REG(val,
510 			    FAN_DIV_FROM_REG(data->fan_div[nr]));
511 	lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]);
512 	mutex_unlock(&data->update_lock);
513 	return count;
514 }
515 
516 /*
517  * Note: we save and restore the fan minimum here, because its value is
518  * determined in part by the fan clock divider.  This follows the principle
519  * of least surprise; the user doesn't expect the fan minimum to change just
520  * because the divider changed.
521  */
set_fan_div(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)522 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
523 			   const char *buf, size_t count)
524 {
525 	struct i2c_client *client = to_i2c_client(dev);
526 	struct lm87_data *data = i2c_get_clientdata(client);
527 	int nr = to_sensor_dev_attr(attr)->index;
528 	long val;
529 	int err;
530 	unsigned long min;
531 	u8 reg;
532 
533 	err = kstrtol(buf, 10, &val);
534 	if (err)
535 		return err;
536 
537 	mutex_lock(&data->update_lock);
538 	min = FAN_FROM_REG(data->fan_min[nr],
539 			   FAN_DIV_FROM_REG(data->fan_div[nr]));
540 
541 	switch (val) {
542 	case 1:
543 		data->fan_div[nr] = 0;
544 		break;
545 	case 2:
546 		data->fan_div[nr] = 1;
547 		break;
548 	case 4:
549 		data->fan_div[nr] = 2;
550 		break;
551 	case 8:
552 		data->fan_div[nr] = 3;
553 		break;
554 	default:
555 		mutex_unlock(&data->update_lock);
556 		return -EINVAL;
557 	}
558 
559 	reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
560 	switch (nr) {
561 	case 0:
562 	    reg = (reg & 0xCF) | (data->fan_div[0] << 4);
563 	    break;
564 	case 1:
565 	    reg = (reg & 0x3F) | (data->fan_div[1] << 6);
566 	    break;
567 	}
568 	lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg);
569 
570 	data->fan_min[nr] = FAN_TO_REG(min, val);
571 	lm87_write_value(client, LM87_REG_FAN_MIN(nr),
572 			 data->fan_min[nr]);
573 	mutex_unlock(&data->update_lock);
574 
575 	return count;
576 }
577 
578 #define set_fan(offset) \
579 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
580 		show_fan_input, NULL, offset - 1); \
581 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
582 		show_fan_min, set_fan_min, offset - 1); \
583 static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
584 		show_fan_div, set_fan_div, offset - 1)
585 set_fan(1);
586 set_fan(2);
587 
show_alarms(struct device * dev,struct device_attribute * attr,char * buf)588 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
589 			   char *buf)
590 {
591 	struct lm87_data *data = lm87_update_device(dev);
592 	return sprintf(buf, "%d\n", data->alarms);
593 }
594 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
595 
show_vid(struct device * dev,struct device_attribute * attr,char * buf)596 static ssize_t show_vid(struct device *dev, struct device_attribute *attr,
597 			char *buf)
598 {
599 	struct lm87_data *data = lm87_update_device(dev);
600 	return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
601 }
602 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
603 
show_vrm(struct device * dev,struct device_attribute * attr,char * buf)604 static ssize_t show_vrm(struct device *dev, struct device_attribute *attr,
605 			char *buf)
606 {
607 	struct lm87_data *data = dev_get_drvdata(dev);
608 	return sprintf(buf, "%d\n", data->vrm);
609 }
set_vrm(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)610 static ssize_t set_vrm(struct device *dev, struct device_attribute *attr,
611 		       const char *buf, size_t count)
612 {
613 	struct lm87_data *data = dev_get_drvdata(dev);
614 	unsigned long val;
615 	int err;
616 
617 	err = kstrtoul(buf, 10, &val);
618 	if (err)
619 		return err;
620 	data->vrm = val;
621 	return count;
622 }
623 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
624 
show_aout(struct device * dev,struct device_attribute * attr,char * buf)625 static ssize_t show_aout(struct device *dev, struct device_attribute *attr,
626 			 char *buf)
627 {
628 	struct lm87_data *data = lm87_update_device(dev);
629 	return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
630 }
set_aout(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)631 static ssize_t set_aout(struct device *dev, struct device_attribute *attr,
632 			const char *buf, size_t count)
633 {
634 	struct i2c_client *client = to_i2c_client(dev);
635 	struct lm87_data *data = i2c_get_clientdata(client);
636 	long val;
637 	int err;
638 
639 	err = kstrtol(buf, 10, &val);
640 	if (err)
641 		return err;
642 
643 	mutex_lock(&data->update_lock);
644 	data->aout = AOUT_TO_REG(val);
645 	lm87_write_value(client, LM87_REG_AOUT, data->aout);
646 	mutex_unlock(&data->update_lock);
647 	return count;
648 }
649 static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout);
650 
show_alarm(struct device * dev,struct device_attribute * attr,char * buf)651 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
652 			  char *buf)
653 {
654 	struct lm87_data *data = lm87_update_device(dev);
655 	int bitnr = to_sensor_dev_attr(attr)->index;
656 	return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
657 }
658 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
659 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
660 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
661 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
662 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
663 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
664 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6);
665 static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 7);
666 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
667 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5);
668 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 5);
669 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
670 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
671 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 14);
672 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 15);
673 
674 /*
675  * Real code
676  */
677 
678 static struct attribute *lm87_attributes[] = {
679 	&sensor_dev_attr_in1_input.dev_attr.attr,
680 	&sensor_dev_attr_in1_min.dev_attr.attr,
681 	&sensor_dev_attr_in1_max.dev_attr.attr,
682 	&sensor_dev_attr_in1_alarm.dev_attr.attr,
683 	&sensor_dev_attr_in2_input.dev_attr.attr,
684 	&sensor_dev_attr_in2_min.dev_attr.attr,
685 	&sensor_dev_attr_in2_max.dev_attr.attr,
686 	&sensor_dev_attr_in2_alarm.dev_attr.attr,
687 	&sensor_dev_attr_in3_input.dev_attr.attr,
688 	&sensor_dev_attr_in3_min.dev_attr.attr,
689 	&sensor_dev_attr_in3_max.dev_attr.attr,
690 	&sensor_dev_attr_in3_alarm.dev_attr.attr,
691 	&sensor_dev_attr_in4_input.dev_attr.attr,
692 	&sensor_dev_attr_in4_min.dev_attr.attr,
693 	&sensor_dev_attr_in4_max.dev_attr.attr,
694 	&sensor_dev_attr_in4_alarm.dev_attr.attr,
695 
696 	&sensor_dev_attr_temp1_input.dev_attr.attr,
697 	&sensor_dev_attr_temp1_max.dev_attr.attr,
698 	&sensor_dev_attr_temp1_min.dev_attr.attr,
699 	&dev_attr_temp1_crit.attr,
700 	&sensor_dev_attr_temp1_alarm.dev_attr.attr,
701 	&sensor_dev_attr_temp2_input.dev_attr.attr,
702 	&sensor_dev_attr_temp2_max.dev_attr.attr,
703 	&sensor_dev_attr_temp2_min.dev_attr.attr,
704 	&dev_attr_temp2_crit.attr,
705 	&sensor_dev_attr_temp2_alarm.dev_attr.attr,
706 	&sensor_dev_attr_temp2_fault.dev_attr.attr,
707 
708 	&dev_attr_alarms.attr,
709 	&dev_attr_aout_output.attr,
710 
711 	NULL
712 };
713 
714 static const struct attribute_group lm87_group = {
715 	.attrs = lm87_attributes,
716 };
717 
718 static struct attribute *lm87_attributes_in6[] = {
719 	&sensor_dev_attr_in6_input.dev_attr.attr,
720 	&sensor_dev_attr_in6_min.dev_attr.attr,
721 	&sensor_dev_attr_in6_max.dev_attr.attr,
722 	&sensor_dev_attr_in6_alarm.dev_attr.attr,
723 	NULL
724 };
725 
726 static const struct attribute_group lm87_group_in6 = {
727 	.attrs = lm87_attributes_in6,
728 };
729 
730 static struct attribute *lm87_attributes_fan1[] = {
731 	&sensor_dev_attr_fan1_input.dev_attr.attr,
732 	&sensor_dev_attr_fan1_min.dev_attr.attr,
733 	&sensor_dev_attr_fan1_div.dev_attr.attr,
734 	&sensor_dev_attr_fan1_alarm.dev_attr.attr,
735 	NULL
736 };
737 
738 static const struct attribute_group lm87_group_fan1 = {
739 	.attrs = lm87_attributes_fan1,
740 };
741 
742 static struct attribute *lm87_attributes_in7[] = {
743 	&sensor_dev_attr_in7_input.dev_attr.attr,
744 	&sensor_dev_attr_in7_min.dev_attr.attr,
745 	&sensor_dev_attr_in7_max.dev_attr.attr,
746 	&sensor_dev_attr_in7_alarm.dev_attr.attr,
747 	NULL
748 };
749 
750 static const struct attribute_group lm87_group_in7 = {
751 	.attrs = lm87_attributes_in7,
752 };
753 
754 static struct attribute *lm87_attributes_fan2[] = {
755 	&sensor_dev_attr_fan2_input.dev_attr.attr,
756 	&sensor_dev_attr_fan2_min.dev_attr.attr,
757 	&sensor_dev_attr_fan2_div.dev_attr.attr,
758 	&sensor_dev_attr_fan2_alarm.dev_attr.attr,
759 	NULL
760 };
761 
762 static const struct attribute_group lm87_group_fan2 = {
763 	.attrs = lm87_attributes_fan2,
764 };
765 
766 static struct attribute *lm87_attributes_temp3[] = {
767 	&sensor_dev_attr_temp3_input.dev_attr.attr,
768 	&sensor_dev_attr_temp3_max.dev_attr.attr,
769 	&sensor_dev_attr_temp3_min.dev_attr.attr,
770 	&dev_attr_temp3_crit.attr,
771 	&sensor_dev_attr_temp3_alarm.dev_attr.attr,
772 	&sensor_dev_attr_temp3_fault.dev_attr.attr,
773 	NULL
774 };
775 
776 static const struct attribute_group lm87_group_temp3 = {
777 	.attrs = lm87_attributes_temp3,
778 };
779 
780 static struct attribute *lm87_attributes_in0_5[] = {
781 	&sensor_dev_attr_in0_input.dev_attr.attr,
782 	&sensor_dev_attr_in0_min.dev_attr.attr,
783 	&sensor_dev_attr_in0_max.dev_attr.attr,
784 	&sensor_dev_attr_in0_alarm.dev_attr.attr,
785 	&sensor_dev_attr_in5_input.dev_attr.attr,
786 	&sensor_dev_attr_in5_min.dev_attr.attr,
787 	&sensor_dev_attr_in5_max.dev_attr.attr,
788 	&sensor_dev_attr_in5_alarm.dev_attr.attr,
789 	NULL
790 };
791 
792 static const struct attribute_group lm87_group_in0_5 = {
793 	.attrs = lm87_attributes_in0_5,
794 };
795 
796 static struct attribute *lm87_attributes_vid[] = {
797 	&dev_attr_cpu0_vid.attr,
798 	&dev_attr_vrm.attr,
799 	NULL
800 };
801 
802 static const struct attribute_group lm87_group_vid = {
803 	.attrs = lm87_attributes_vid,
804 };
805 
806 /* Return 0 if detection is successful, -ENODEV otherwise */
lm87_detect(struct i2c_client * client,struct i2c_board_info * info)807 static int lm87_detect(struct i2c_client *client, struct i2c_board_info *info)
808 {
809 	struct i2c_adapter *adapter = client->adapter;
810 	const char *name;
811 	u8 cid, rev;
812 
813 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
814 		return -ENODEV;
815 
816 	if (lm87_read_value(client, LM87_REG_CONFIG) & 0x80)
817 		return -ENODEV;
818 
819 	/* Now, we do the remaining detection. */
820 	cid = lm87_read_value(client, LM87_REG_COMPANY_ID);
821 	rev = lm87_read_value(client, LM87_REG_REVISION);
822 
823 	if (cid == 0x02			/* National Semiconductor */
824 	 && (rev >= 0x01 && rev <= 0x08))
825 		name = "lm87";
826 	else if (cid == 0x41		/* Analog Devices */
827 	      && (rev & 0xf0) == 0x10)
828 		name = "adm1024";
829 	else {
830 		dev_dbg(&adapter->dev, "LM87 detection failed at 0x%02x\n",
831 			client->addr);
832 		return -ENODEV;
833 	}
834 
835 	strlcpy(info->type, name, I2C_NAME_SIZE);
836 
837 	return 0;
838 }
839 
lm87_remove_files(struct i2c_client * client)840 static void lm87_remove_files(struct i2c_client *client)
841 {
842 	struct device *dev = &client->dev;
843 
844 	sysfs_remove_group(&dev->kobj, &lm87_group);
845 	sysfs_remove_group(&dev->kobj, &lm87_group_in6);
846 	sysfs_remove_group(&dev->kobj, &lm87_group_fan1);
847 	sysfs_remove_group(&dev->kobj, &lm87_group_in7);
848 	sysfs_remove_group(&dev->kobj, &lm87_group_fan2);
849 	sysfs_remove_group(&dev->kobj, &lm87_group_temp3);
850 	sysfs_remove_group(&dev->kobj, &lm87_group_in0_5);
851 	sysfs_remove_group(&dev->kobj, &lm87_group_vid);
852 }
853 
lm87_init_client(struct i2c_client * client)854 static void lm87_init_client(struct i2c_client *client)
855 {
856 	struct lm87_data *data = i2c_get_clientdata(client);
857 
858 	if (client->dev.platform_data) {
859 		data->channel = *(u8 *)client->dev.platform_data;
860 		lm87_write_value(client,
861 				 LM87_REG_CHANNEL_MODE, data->channel);
862 	} else {
863 		data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE);
864 	}
865 	data->config = lm87_read_value(client, LM87_REG_CONFIG) & 0x6F;
866 
867 	if (!(data->config & 0x01)) {
868 		int i;
869 
870 		/* Limits are left uninitialized after power-up */
871 		for (i = 1; i < 6; i++) {
872 			lm87_write_value(client, LM87_REG_IN_MIN(i), 0x00);
873 			lm87_write_value(client, LM87_REG_IN_MAX(i), 0xFF);
874 		}
875 		for (i = 0; i < 2; i++) {
876 			lm87_write_value(client, LM87_REG_TEMP_HIGH[i], 0x7F);
877 			lm87_write_value(client, LM87_REG_TEMP_LOW[i], 0x00);
878 			lm87_write_value(client, LM87_REG_AIN_MIN(i), 0x00);
879 			lm87_write_value(client, LM87_REG_AIN_MAX(i), 0xFF);
880 		}
881 		if (data->channel & CHAN_TEMP3) {
882 			lm87_write_value(client, LM87_REG_TEMP_HIGH[2], 0x7F);
883 			lm87_write_value(client, LM87_REG_TEMP_LOW[2], 0x00);
884 		} else {
885 			lm87_write_value(client, LM87_REG_IN_MIN(0), 0x00);
886 			lm87_write_value(client, LM87_REG_IN_MAX(0), 0xFF);
887 		}
888 	}
889 
890 	/* Make sure Start is set and INT#_Clear is clear */
891 	if ((data->config & 0x09) != 0x01)
892 		lm87_write_value(client, LM87_REG_CONFIG,
893 				 (data->config & 0x77) | 0x01);
894 }
895 
lm87_probe(struct i2c_client * client,const struct i2c_device_id * id)896 static int lm87_probe(struct i2c_client *client, const struct i2c_device_id *id)
897 {
898 	struct lm87_data *data;
899 	int err;
900 
901 	data = kzalloc(sizeof(struct lm87_data), GFP_KERNEL);
902 	if (!data) {
903 		err = -ENOMEM;
904 		goto exit;
905 	}
906 
907 	i2c_set_clientdata(client, data);
908 	data->valid = 0;
909 	mutex_init(&data->update_lock);
910 
911 	/* Initialize the LM87 chip */
912 	lm87_init_client(client);
913 
914 	data->in_scale[0] = 2500;
915 	data->in_scale[1] = 2700;
916 	data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300;
917 	data->in_scale[3] = 5000;
918 	data->in_scale[4] = 12000;
919 	data->in_scale[5] = 2700;
920 	data->in_scale[6] = 1875;
921 	data->in_scale[7] = 1875;
922 
923 	/* Register sysfs hooks */
924 	err = sysfs_create_group(&client->dev.kobj, &lm87_group);
925 	if (err)
926 		goto exit_free;
927 
928 	if (data->channel & CHAN_NO_FAN(0)) {
929 		err = sysfs_create_group(&client->dev.kobj, &lm87_group_in6);
930 		if (err)
931 			goto exit_remove;
932 	} else {
933 		err = sysfs_create_group(&client->dev.kobj, &lm87_group_fan1);
934 		if (err)
935 			goto exit_remove;
936 	}
937 
938 	if (data->channel & CHAN_NO_FAN(1)) {
939 		err = sysfs_create_group(&client->dev.kobj, &lm87_group_in7);
940 		if (err)
941 			goto exit_remove;
942 	} else {
943 		err = sysfs_create_group(&client->dev.kobj, &lm87_group_fan2);
944 		if (err)
945 			goto exit_remove;
946 	}
947 
948 	if (data->channel & CHAN_TEMP3) {
949 		err = sysfs_create_group(&client->dev.kobj, &lm87_group_temp3);
950 		if (err)
951 			goto exit_remove;
952 	} else {
953 		err = sysfs_create_group(&client->dev.kobj, &lm87_group_in0_5);
954 		if (err)
955 			goto exit_remove;
956 	}
957 
958 	if (!(data->channel & CHAN_NO_VID)) {
959 		data->vrm = vid_which_vrm();
960 		err = sysfs_create_group(&client->dev.kobj, &lm87_group_vid);
961 		if (err)
962 			goto exit_remove;
963 	}
964 
965 	data->hwmon_dev = hwmon_device_register(&client->dev);
966 	if (IS_ERR(data->hwmon_dev)) {
967 		err = PTR_ERR(data->hwmon_dev);
968 		goto exit_remove;
969 	}
970 
971 	return 0;
972 
973 exit_remove:
974 	lm87_remove_files(client);
975 exit_free:
976 	lm87_write_value(client, LM87_REG_CONFIG, data->config);
977 	kfree(data);
978 exit:
979 	return err;
980 }
981 
lm87_remove(struct i2c_client * client)982 static int lm87_remove(struct i2c_client *client)
983 {
984 	struct lm87_data *data = i2c_get_clientdata(client);
985 
986 	hwmon_device_unregister(data->hwmon_dev);
987 	lm87_remove_files(client);
988 
989 	lm87_write_value(client, LM87_REG_CONFIG, data->config);
990 	kfree(data);
991 	return 0;
992 }
993 
994 /*
995  * Driver data (common to all clients)
996  */
997 
998 static const struct i2c_device_id lm87_id[] = {
999 	{ "lm87", lm87 },
1000 	{ "adm1024", adm1024 },
1001 	{ }
1002 };
1003 MODULE_DEVICE_TABLE(i2c, lm87_id);
1004 
1005 static struct i2c_driver lm87_driver = {
1006 	.class		= I2C_CLASS_HWMON,
1007 	.driver = {
1008 		.name	= "lm87",
1009 	},
1010 	.probe		= lm87_probe,
1011 	.remove		= lm87_remove,
1012 	.id_table	= lm87_id,
1013 	.detect		= lm87_detect,
1014 	.address_list	= normal_i2c,
1015 };
1016 
1017 module_i2c_driver(lm87_driver);
1018 
1019 MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org> and others");
1020 MODULE_DESCRIPTION("LM87 driver");
1021 MODULE_LICENSE("GPL");
1022