xref: /openbmc/linux/drivers/hwmon/w83l786ng.c (revision e23feb16)
1 /*
2  * w83l786ng.c - Linux kernel driver for hardware monitoring
3  * Copyright (c) 2007 Kevin Lo <kevlo@kevlo.org>
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation - version 2.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
17  * 02110-1301 USA.
18  */
19 
20 /*
21  * Supports following chips:
22  *
23  * Chip		#vin	#fanin	#pwm	#temp	wchipid	vendid	i2c	ISA
24  * w83l786ng	3	2	2	2	0x7b	0x5ca3	yes	no
25  */
26 
27 #include <linux/module.h>
28 #include <linux/init.h>
29 #include <linux/slab.h>
30 #include <linux/i2c.h>
31 #include <linux/hwmon.h>
32 #include <linux/hwmon-vid.h>
33 #include <linux/hwmon-sysfs.h>
34 #include <linux/err.h>
35 #include <linux/mutex.h>
36 #include <linux/jiffies.h>
37 
38 /* Addresses to scan */
39 static const unsigned short normal_i2c[] = { 0x2e, 0x2f, I2C_CLIENT_END };
40 
41 /* Insmod parameters */
42 
43 static bool reset;
44 module_param(reset, bool, 0);
45 MODULE_PARM_DESC(reset, "Set to 1 to reset chip, not recommended");
46 
47 #define W83L786NG_REG_IN_MIN(nr)	(0x2C + (nr) * 2)
48 #define W83L786NG_REG_IN_MAX(nr)	(0x2B + (nr) * 2)
49 #define W83L786NG_REG_IN(nr)		((nr) + 0x20)
50 
51 #define W83L786NG_REG_FAN(nr)		((nr) + 0x28)
52 #define W83L786NG_REG_FAN_MIN(nr)	((nr) + 0x3B)
53 
54 #define W83L786NG_REG_CONFIG		0x40
55 #define W83L786NG_REG_ALARM1		0x41
56 #define W83L786NG_REG_ALARM2		0x42
57 #define W83L786NG_REG_GPIO_EN		0x47
58 #define W83L786NG_REG_MAN_ID2		0x4C
59 #define W83L786NG_REG_MAN_ID1		0x4D
60 #define W83L786NG_REG_CHIP_ID		0x4E
61 
62 #define W83L786NG_REG_DIODE		0x53
63 #define W83L786NG_REG_FAN_DIV		0x54
64 #define W83L786NG_REG_FAN_CFG		0x80
65 
66 #define W83L786NG_REG_TOLERANCE		0x8D
67 
68 static const u8 W83L786NG_REG_TEMP[2][3] = {
69 	{ 0x25,		/* TEMP 0 in DataSheet */
70 	  0x35,		/* TEMP 0 Over in DataSheet */
71 	  0x36 },	/* TEMP 0 Hyst in DataSheet */
72 	{ 0x26,		/* TEMP 1 in DataSheet */
73 	  0x37,		/* TEMP 1 Over in DataSheet */
74 	  0x38 }	/* TEMP 1 Hyst in DataSheet */
75 };
76 
77 static const u8 W83L786NG_PWM_MODE_SHIFT[] = {6, 7};
78 static const u8 W83L786NG_PWM_ENABLE_SHIFT[] = {2, 4};
79 
80 /* FAN Duty Cycle, be used to control */
81 static const u8 W83L786NG_REG_PWM[] = {0x81, 0x87};
82 
83 
84 static inline u8
85 FAN_TO_REG(long rpm, int div)
86 {
87 	if (rpm == 0)
88 		return 255;
89 	rpm = clamp_val(rpm, 1, 1000000);
90 	return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
91 }
92 
93 #define FAN_FROM_REG(val, div)	((val) == 0   ? -1 : \
94 				((val) == 255 ? 0 : \
95 				1350000 / ((val) * (div))))
96 
97 /* for temp */
98 #define TEMP_TO_REG(val)	(clamp_val(((val) < 0 ? (val) + 0x100 * 1000 \
99 						      : (val)) / 1000, 0, 0xff))
100 #define TEMP_FROM_REG(val)	(((val) & 0x80 ? \
101 				  (val) - 0x100 : (val)) * 1000)
102 
103 /*
104  * The analog voltage inputs have 8mV LSB. Since the sysfs output is
105  * in mV as would be measured on the chip input pin, need to just
106  * multiply/divide by 8 to translate from/to register values.
107  */
108 #define IN_TO_REG(val)		(clamp_val((((val) + 4) / 8), 0, 255))
109 #define IN_FROM_REG(val)	((val) * 8)
110 
111 #define DIV_FROM_REG(val)	(1 << (val))
112 
113 static inline u8
114 DIV_TO_REG(long val)
115 {
116 	int i;
117 	val = clamp_val(val, 1, 128) >> 1;
118 	for (i = 0; i < 7; i++) {
119 		if (val == 0)
120 			break;
121 		val >>= 1;
122 	}
123 	return (u8)i;
124 }
125 
126 struct w83l786ng_data {
127 	struct device *hwmon_dev;
128 	struct mutex update_lock;
129 	char valid;			/* !=0 if following fields are valid */
130 	unsigned long last_updated;	/* In jiffies */
131 	unsigned long last_nonvolatile;	/* In jiffies, last time we update the
132 					 * nonvolatile registers */
133 
134 	u8 in[3];
135 	u8 in_max[3];
136 	u8 in_min[3];
137 	u8 fan[2];
138 	u8 fan_div[2];
139 	u8 fan_min[2];
140 	u8 temp_type[2];
141 	u8 temp[2][3];
142 	u8 pwm[2];
143 	u8 pwm_mode[2];	/* 0->DC variable voltage
144 			 * 1->PWM variable duty cycle */
145 
146 	u8 pwm_enable[2]; /* 1->manual
147 			   * 2->thermal cruise (also called SmartFan I) */
148 	u8 tolerance[2];
149 };
150 
151 static int w83l786ng_probe(struct i2c_client *client,
152 			   const struct i2c_device_id *id);
153 static int w83l786ng_detect(struct i2c_client *client,
154 			    struct i2c_board_info *info);
155 static int w83l786ng_remove(struct i2c_client *client);
156 static void w83l786ng_init_client(struct i2c_client *client);
157 static struct w83l786ng_data *w83l786ng_update_device(struct device *dev);
158 
159 static const struct i2c_device_id w83l786ng_id[] = {
160 	{ "w83l786ng", 0 },
161 	{ }
162 };
163 MODULE_DEVICE_TABLE(i2c, w83l786ng_id);
164 
165 static struct i2c_driver w83l786ng_driver = {
166 	.class		= I2C_CLASS_HWMON,
167 	.driver = {
168 		   .name = "w83l786ng",
169 	},
170 	.probe		= w83l786ng_probe,
171 	.remove		= w83l786ng_remove,
172 	.id_table	= w83l786ng_id,
173 	.detect		= w83l786ng_detect,
174 	.address_list	= normal_i2c,
175 };
176 
177 static u8
178 w83l786ng_read_value(struct i2c_client *client, u8 reg)
179 {
180 	return i2c_smbus_read_byte_data(client, reg);
181 }
182 
183 static int
184 w83l786ng_write_value(struct i2c_client *client, u8 reg, u8 value)
185 {
186 	return i2c_smbus_write_byte_data(client, reg, value);
187 }
188 
189 /* following are the sysfs callback functions */
190 #define show_in_reg(reg) \
191 static ssize_t \
192 show_##reg(struct device *dev, struct device_attribute *attr, \
193 	   char *buf) \
194 { \
195 	int nr = to_sensor_dev_attr(attr)->index; \
196 	struct w83l786ng_data *data = w83l786ng_update_device(dev); \
197 	return sprintf(buf, "%d\n", IN_FROM_REG(data->reg[nr])); \
198 }
199 
200 show_in_reg(in)
201 show_in_reg(in_min)
202 show_in_reg(in_max)
203 
204 #define store_in_reg(REG, reg) \
205 static ssize_t \
206 store_in_##reg(struct device *dev, struct device_attribute *attr, \
207 	       const char *buf, size_t count) \
208 { \
209 	int nr = to_sensor_dev_attr(attr)->index; \
210 	struct i2c_client *client = to_i2c_client(dev); \
211 	struct w83l786ng_data *data = i2c_get_clientdata(client); \
212 	unsigned long val; \
213 	int err = kstrtoul(buf, 10, &val); \
214 	if (err) \
215 		return err; \
216 	mutex_lock(&data->update_lock); \
217 	data->in_##reg[nr] = IN_TO_REG(val); \
218 	w83l786ng_write_value(client, W83L786NG_REG_IN_##REG(nr), \
219 			      data->in_##reg[nr]); \
220 	mutex_unlock(&data->update_lock); \
221 	return count; \
222 }
223 
224 store_in_reg(MIN, min)
225 store_in_reg(MAX, max)
226 
227 static struct sensor_device_attribute sda_in_input[] = {
228 	SENSOR_ATTR(in0_input, S_IRUGO, show_in, NULL, 0),
229 	SENSOR_ATTR(in1_input, S_IRUGO, show_in, NULL, 1),
230 	SENSOR_ATTR(in2_input, S_IRUGO, show_in, NULL, 2),
231 };
232 
233 static struct sensor_device_attribute sda_in_min[] = {
234 	SENSOR_ATTR(in0_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 0),
235 	SENSOR_ATTR(in1_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 1),
236 	SENSOR_ATTR(in2_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 2),
237 };
238 
239 static struct sensor_device_attribute sda_in_max[] = {
240 	SENSOR_ATTR(in0_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 0),
241 	SENSOR_ATTR(in1_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 1),
242 	SENSOR_ATTR(in2_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 2),
243 };
244 
245 #define show_fan_reg(reg) \
246 static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
247 			  char *buf) \
248 { \
249 	int nr = to_sensor_dev_attr(attr)->index; \
250 	struct w83l786ng_data *data = w83l786ng_update_device(dev); \
251 	return sprintf(buf, "%d\n", \
252 		FAN_FROM_REG(data->fan[nr], DIV_FROM_REG(data->fan_div[nr]))); \
253 }
254 
255 show_fan_reg(fan);
256 show_fan_reg(fan_min);
257 
258 static ssize_t
259 store_fan_min(struct device *dev, struct device_attribute *attr,
260 	      const char *buf, size_t count)
261 {
262 	int nr = to_sensor_dev_attr(attr)->index;
263 	struct i2c_client *client = to_i2c_client(dev);
264 	struct w83l786ng_data *data = i2c_get_clientdata(client);
265 	unsigned long val;
266 	int err;
267 
268 	err = kstrtoul(buf, 10, &val);
269 	if (err)
270 		return err;
271 
272 	mutex_lock(&data->update_lock);
273 	data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
274 	w83l786ng_write_value(client, W83L786NG_REG_FAN_MIN(nr),
275 			      data->fan_min[nr]);
276 	mutex_unlock(&data->update_lock);
277 
278 	return count;
279 }
280 
281 static ssize_t
282 show_fan_div(struct device *dev, struct device_attribute *attr,
283 	     char *buf)
284 {
285 	int nr = to_sensor_dev_attr(attr)->index;
286 	struct w83l786ng_data *data = w83l786ng_update_device(dev);
287 	return sprintf(buf, "%u\n", DIV_FROM_REG(data->fan_div[nr]));
288 }
289 
290 /*
291  * Note: we save and restore the fan minimum here, because its value is
292  * determined in part by the fan divisor.  This follows the principle of
293  * least surprise; the user doesn't expect the fan minimum to change just
294  * because the divisor changed.
295  */
296 static ssize_t
297 store_fan_div(struct device *dev, struct device_attribute *attr,
298 	      const char *buf, size_t count)
299 {
300 	int nr = to_sensor_dev_attr(attr)->index;
301 	struct i2c_client *client = to_i2c_client(dev);
302 	struct w83l786ng_data *data = i2c_get_clientdata(client);
303 
304 	unsigned long min;
305 	u8 tmp_fan_div;
306 	u8 fan_div_reg;
307 	u8 keep_mask = 0;
308 	u8 new_shift = 0;
309 
310 	unsigned long val;
311 	int err;
312 
313 	err = kstrtoul(buf, 10, &val);
314 	if (err)
315 		return err;
316 
317 	/* Save fan_min */
318 	mutex_lock(&data->update_lock);
319 	min = FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr]));
320 
321 	data->fan_div[nr] = DIV_TO_REG(val);
322 
323 	switch (nr) {
324 	case 0:
325 		keep_mask = 0xf8;
326 		new_shift = 0;
327 		break;
328 	case 1:
329 		keep_mask = 0x8f;
330 		new_shift = 4;
331 		break;
332 	}
333 
334 	fan_div_reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV)
335 					   & keep_mask;
336 
337 	tmp_fan_div = (data->fan_div[nr] << new_shift) & ~keep_mask;
338 
339 	w83l786ng_write_value(client, W83L786NG_REG_FAN_DIV,
340 			      fan_div_reg | tmp_fan_div);
341 
342 	/* Restore fan_min */
343 	data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
344 	w83l786ng_write_value(client, W83L786NG_REG_FAN_MIN(nr),
345 			      data->fan_min[nr]);
346 	mutex_unlock(&data->update_lock);
347 
348 	return count;
349 }
350 
351 static struct sensor_device_attribute sda_fan_input[] = {
352 	SENSOR_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0),
353 	SENSOR_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1),
354 };
355 
356 static struct sensor_device_attribute sda_fan_min[] = {
357 	SENSOR_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan_min,
358 		    store_fan_min, 0),
359 	SENSOR_ATTR(fan2_min, S_IWUSR | S_IRUGO, show_fan_min,
360 		    store_fan_min, 1),
361 };
362 
363 static struct sensor_device_attribute sda_fan_div[] = {
364 	SENSOR_ATTR(fan1_div, S_IWUSR | S_IRUGO, show_fan_div,
365 		    store_fan_div, 0),
366 	SENSOR_ATTR(fan2_div, S_IWUSR | S_IRUGO, show_fan_div,
367 		    store_fan_div, 1),
368 };
369 
370 
371 /* read/write the temperature, includes measured value and limits */
372 
373 static ssize_t
374 show_temp(struct device *dev, struct device_attribute *attr, char *buf)
375 {
376 	struct sensor_device_attribute_2 *sensor_attr =
377 	    to_sensor_dev_attr_2(attr);
378 	int nr = sensor_attr->nr;
379 	int index = sensor_attr->index;
380 	struct w83l786ng_data *data = w83l786ng_update_device(dev);
381 	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr][index]));
382 }
383 
384 static ssize_t
385 store_temp(struct device *dev, struct device_attribute *attr,
386 	   const char *buf, size_t count)
387 {
388 	struct sensor_device_attribute_2 *sensor_attr =
389 	    to_sensor_dev_attr_2(attr);
390 	int nr = sensor_attr->nr;
391 	int index = sensor_attr->index;
392 	struct i2c_client *client = to_i2c_client(dev);
393 	struct w83l786ng_data *data = i2c_get_clientdata(client);
394 	long val;
395 	int err;
396 
397 	err = kstrtol(buf, 10, &val);
398 	if (err)
399 		return err;
400 
401 	mutex_lock(&data->update_lock);
402 	data->temp[nr][index] = TEMP_TO_REG(val);
403 	w83l786ng_write_value(client, W83L786NG_REG_TEMP[nr][index],
404 			      data->temp[nr][index]);
405 	mutex_unlock(&data->update_lock);
406 
407 	return count;
408 }
409 
410 static struct sensor_device_attribute_2 sda_temp_input[] = {
411 	SENSOR_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0),
412 	SENSOR_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 1, 0),
413 };
414 
415 static struct sensor_device_attribute_2 sda_temp_max[] = {
416 	SENSOR_ATTR_2(temp1_max, S_IRUGO | S_IWUSR,
417 		      show_temp, store_temp, 0, 1),
418 	SENSOR_ATTR_2(temp2_max, S_IRUGO | S_IWUSR,
419 		      show_temp, store_temp, 1, 1),
420 };
421 
422 static struct sensor_device_attribute_2 sda_temp_max_hyst[] = {
423 	SENSOR_ATTR_2(temp1_max_hyst, S_IRUGO | S_IWUSR,
424 		      show_temp, store_temp, 0, 2),
425 	SENSOR_ATTR_2(temp2_max_hyst, S_IRUGO | S_IWUSR,
426 		      show_temp, store_temp, 1, 2),
427 };
428 
429 #define show_pwm_reg(reg) \
430 static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
431 			  char *buf) \
432 { \
433 	struct w83l786ng_data *data = w83l786ng_update_device(dev); \
434 	int nr = to_sensor_dev_attr(attr)->index; \
435 	return sprintf(buf, "%d\n", data->reg[nr]); \
436 }
437 
438 show_pwm_reg(pwm_mode)
439 show_pwm_reg(pwm_enable)
440 show_pwm_reg(pwm)
441 
442 static ssize_t
443 store_pwm_mode(struct device *dev, struct device_attribute *attr,
444 	       const char *buf, size_t count)
445 {
446 	int nr = to_sensor_dev_attr(attr)->index;
447 	struct i2c_client *client = to_i2c_client(dev);
448 	struct w83l786ng_data *data = i2c_get_clientdata(client);
449 	u8 reg;
450 	unsigned long val;
451 	int err;
452 
453 	err = kstrtoul(buf, 10, &val);
454 	if (err)
455 		return err;
456 
457 	if (val > 1)
458 		return -EINVAL;
459 	mutex_lock(&data->update_lock);
460 	data->pwm_mode[nr] = val;
461 	reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
462 	reg &= ~(1 << W83L786NG_PWM_MODE_SHIFT[nr]);
463 	if (!val)
464 		reg |= 1 << W83L786NG_PWM_MODE_SHIFT[nr];
465 	w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg);
466 	mutex_unlock(&data->update_lock);
467 	return count;
468 }
469 
470 static ssize_t
471 store_pwm(struct device *dev, struct device_attribute *attr,
472 	  const char *buf, size_t count)
473 {
474 	int nr = to_sensor_dev_attr(attr)->index;
475 	struct i2c_client *client = to_i2c_client(dev);
476 	struct w83l786ng_data *data = i2c_get_clientdata(client);
477 	unsigned long val;
478 	int err;
479 
480 	err = kstrtoul(buf, 10, &val);
481 	if (err)
482 		return err;
483 	val = clamp_val(val, 0, 255);
484 
485 	mutex_lock(&data->update_lock);
486 	data->pwm[nr] = val;
487 	w83l786ng_write_value(client, W83L786NG_REG_PWM[nr], val);
488 	mutex_unlock(&data->update_lock);
489 	return count;
490 }
491 
492 static ssize_t
493 store_pwm_enable(struct device *dev, struct device_attribute *attr,
494 		 const char *buf, size_t count)
495 {
496 	int nr = to_sensor_dev_attr(attr)->index;
497 	struct i2c_client *client = to_i2c_client(dev);
498 	struct w83l786ng_data *data = i2c_get_clientdata(client);
499 	u8 reg;
500 	unsigned long val;
501 	int err;
502 
503 	err = kstrtoul(buf, 10, &val);
504 	if (err)
505 		return err;
506 
507 	if (!val || val > 2)  /* only modes 1 and 2 are supported */
508 		return -EINVAL;
509 
510 	mutex_lock(&data->update_lock);
511 	reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
512 	data->pwm_enable[nr] = val;
513 	reg &= ~(0x02 << W83L786NG_PWM_ENABLE_SHIFT[nr]);
514 	reg |= (val - 1) << W83L786NG_PWM_ENABLE_SHIFT[nr];
515 	w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg);
516 	mutex_unlock(&data->update_lock);
517 	return count;
518 }
519 
520 static struct sensor_device_attribute sda_pwm[] = {
521 	SENSOR_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 0),
522 	SENSOR_ATTR(pwm2, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 1),
523 };
524 
525 static struct sensor_device_attribute sda_pwm_mode[] = {
526 	SENSOR_ATTR(pwm1_mode, S_IWUSR | S_IRUGO, show_pwm_mode,
527 		    store_pwm_mode, 0),
528 	SENSOR_ATTR(pwm2_mode, S_IWUSR | S_IRUGO, show_pwm_mode,
529 		    store_pwm_mode, 1),
530 };
531 
532 static struct sensor_device_attribute sda_pwm_enable[] = {
533 	SENSOR_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, show_pwm_enable,
534 		    store_pwm_enable, 0),
535 	SENSOR_ATTR(pwm2_enable, S_IWUSR | S_IRUGO, show_pwm_enable,
536 		    store_pwm_enable, 1),
537 };
538 
539 /* For Smart Fan I/Thermal Cruise and Smart Fan II */
540 static ssize_t
541 show_tolerance(struct device *dev, struct device_attribute *attr, char *buf)
542 {
543 	int nr = to_sensor_dev_attr(attr)->index;
544 	struct w83l786ng_data *data = w83l786ng_update_device(dev);
545 	return sprintf(buf, "%ld\n", (long)data->tolerance[nr]);
546 }
547 
548 static ssize_t
549 store_tolerance(struct device *dev, struct device_attribute *attr,
550 		const char *buf, size_t count)
551 {
552 	int nr = to_sensor_dev_attr(attr)->index;
553 	struct i2c_client *client = to_i2c_client(dev);
554 	struct w83l786ng_data *data = i2c_get_clientdata(client);
555 	u8 tol_tmp, tol_mask;
556 	unsigned long val;
557 	int err;
558 
559 	err = kstrtoul(buf, 10, &val);
560 	if (err)
561 		return err;
562 
563 	mutex_lock(&data->update_lock);
564 	tol_mask = w83l786ng_read_value(client,
565 	    W83L786NG_REG_TOLERANCE) & ((nr == 1) ? 0x0f : 0xf0);
566 	tol_tmp = clamp_val(val, 0, 15);
567 	tol_tmp &= 0x0f;
568 	data->tolerance[nr] = tol_tmp;
569 	if (nr == 1)
570 		tol_tmp <<= 4;
571 
572 	w83l786ng_write_value(client, W83L786NG_REG_TOLERANCE,
573 			      tol_mask | tol_tmp);
574 	mutex_unlock(&data->update_lock);
575 	return count;
576 }
577 
578 static struct sensor_device_attribute sda_tolerance[] = {
579 	SENSOR_ATTR(pwm1_tolerance, S_IWUSR | S_IRUGO,
580 		    show_tolerance, store_tolerance, 0),
581 	SENSOR_ATTR(pwm2_tolerance, S_IWUSR | S_IRUGO,
582 		    show_tolerance, store_tolerance, 1),
583 };
584 
585 
586 #define IN_UNIT_ATTRS(X)	\
587 	&sda_in_input[X].dev_attr.attr,		\
588 	&sda_in_min[X].dev_attr.attr,		\
589 	&sda_in_max[X].dev_attr.attr
590 
591 #define FAN_UNIT_ATTRS(X)	\
592 	&sda_fan_input[X].dev_attr.attr,	\
593 	&sda_fan_min[X].dev_attr.attr,		\
594 	&sda_fan_div[X].dev_attr.attr
595 
596 #define TEMP_UNIT_ATTRS(X)	\
597 	&sda_temp_input[X].dev_attr.attr,	\
598 	&sda_temp_max[X].dev_attr.attr,		\
599 	&sda_temp_max_hyst[X].dev_attr.attr
600 
601 #define PWM_UNIT_ATTRS(X)	\
602 	&sda_pwm[X].dev_attr.attr,		\
603 	&sda_pwm_mode[X].dev_attr.attr,		\
604 	&sda_pwm_enable[X].dev_attr.attr
605 
606 #define TOLERANCE_UNIT_ATTRS(X)	\
607 	&sda_tolerance[X].dev_attr.attr
608 
609 static struct attribute *w83l786ng_attributes[] = {
610 	IN_UNIT_ATTRS(0),
611 	IN_UNIT_ATTRS(1),
612 	IN_UNIT_ATTRS(2),
613 	FAN_UNIT_ATTRS(0),
614 	FAN_UNIT_ATTRS(1),
615 	TEMP_UNIT_ATTRS(0),
616 	TEMP_UNIT_ATTRS(1),
617 	PWM_UNIT_ATTRS(0),
618 	PWM_UNIT_ATTRS(1),
619 	TOLERANCE_UNIT_ATTRS(0),
620 	TOLERANCE_UNIT_ATTRS(1),
621 	NULL
622 };
623 
624 static const struct attribute_group w83l786ng_group = {
625 	.attrs = w83l786ng_attributes,
626 };
627 
628 static int
629 w83l786ng_detect(struct i2c_client *client, struct i2c_board_info *info)
630 {
631 	struct i2c_adapter *adapter = client->adapter;
632 	u16 man_id;
633 	u8 chip_id;
634 
635 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
636 		return -ENODEV;
637 
638 	/* Detection */
639 	if ((w83l786ng_read_value(client, W83L786NG_REG_CONFIG) & 0x80)) {
640 		dev_dbg(&adapter->dev, "W83L786NG detection failed at 0x%02x\n",
641 			client->addr);
642 		return -ENODEV;
643 	}
644 
645 	/* Identification */
646 	man_id = (w83l786ng_read_value(client, W83L786NG_REG_MAN_ID1) << 8) +
647 		 w83l786ng_read_value(client, W83L786NG_REG_MAN_ID2);
648 	chip_id = w83l786ng_read_value(client, W83L786NG_REG_CHIP_ID);
649 
650 	if (man_id != 0x5CA3 ||		/* Winbond */
651 	    chip_id != 0x80) {		/* W83L786NG */
652 		dev_dbg(&adapter->dev,
653 			"Unsupported chip (man_id=0x%04X, chip_id=0x%02X)\n",
654 			man_id, chip_id);
655 		return -ENODEV;
656 	}
657 
658 	strlcpy(info->type, "w83l786ng", I2C_NAME_SIZE);
659 
660 	return 0;
661 }
662 
663 static int
664 w83l786ng_probe(struct i2c_client *client, const struct i2c_device_id *id)
665 {
666 	struct device *dev = &client->dev;
667 	struct w83l786ng_data *data;
668 	int i, err = 0;
669 	u8 reg_tmp;
670 
671 	data = devm_kzalloc(&client->dev, sizeof(struct w83l786ng_data),
672 			    GFP_KERNEL);
673 	if (!data)
674 		return -ENOMEM;
675 
676 	i2c_set_clientdata(client, data);
677 	mutex_init(&data->update_lock);
678 
679 	/* Initialize the chip */
680 	w83l786ng_init_client(client);
681 
682 	/* A few vars need to be filled upon startup */
683 	for (i = 0; i < 2; i++) {
684 		data->fan_min[i] = w83l786ng_read_value(client,
685 		    W83L786NG_REG_FAN_MIN(i));
686 	}
687 
688 	/* Update the fan divisor */
689 	reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV);
690 	data->fan_div[0] = reg_tmp & 0x07;
691 	data->fan_div[1] = (reg_tmp >> 4) & 0x07;
692 
693 	/* Register sysfs hooks */
694 	err = sysfs_create_group(&client->dev.kobj, &w83l786ng_group);
695 	if (err)
696 		goto exit_remove;
697 
698 	data->hwmon_dev = hwmon_device_register(dev);
699 	if (IS_ERR(data->hwmon_dev)) {
700 		err = PTR_ERR(data->hwmon_dev);
701 		goto exit_remove;
702 	}
703 
704 	return 0;
705 
706 	/* Unregister sysfs hooks */
707 
708 exit_remove:
709 	sysfs_remove_group(&client->dev.kobj, &w83l786ng_group);
710 	return err;
711 }
712 
713 static int
714 w83l786ng_remove(struct i2c_client *client)
715 {
716 	struct w83l786ng_data *data = i2c_get_clientdata(client);
717 
718 	hwmon_device_unregister(data->hwmon_dev);
719 	sysfs_remove_group(&client->dev.kobj, &w83l786ng_group);
720 
721 	return 0;
722 }
723 
724 static void
725 w83l786ng_init_client(struct i2c_client *client)
726 {
727 	u8 tmp;
728 
729 	if (reset)
730 		w83l786ng_write_value(client, W83L786NG_REG_CONFIG, 0x80);
731 
732 	/* Start monitoring */
733 	tmp = w83l786ng_read_value(client, W83L786NG_REG_CONFIG);
734 	if (!(tmp & 0x01))
735 		w83l786ng_write_value(client, W83L786NG_REG_CONFIG, tmp | 0x01);
736 }
737 
738 static struct w83l786ng_data *w83l786ng_update_device(struct device *dev)
739 {
740 	struct i2c_client *client = to_i2c_client(dev);
741 	struct w83l786ng_data *data = i2c_get_clientdata(client);
742 	int i, j;
743 	u8 reg_tmp, pwmcfg;
744 
745 	mutex_lock(&data->update_lock);
746 	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
747 	    || !data->valid) {
748 		dev_dbg(&client->dev, "Updating w83l786ng data.\n");
749 
750 		/* Update the voltages measured value and limits */
751 		for (i = 0; i < 3; i++) {
752 			data->in[i] = w83l786ng_read_value(client,
753 			    W83L786NG_REG_IN(i));
754 			data->in_min[i] = w83l786ng_read_value(client,
755 			    W83L786NG_REG_IN_MIN(i));
756 			data->in_max[i] = w83l786ng_read_value(client,
757 			    W83L786NG_REG_IN_MAX(i));
758 		}
759 
760 		/* Update the fan counts and limits */
761 		for (i = 0; i < 2; i++) {
762 			data->fan[i] = w83l786ng_read_value(client,
763 			    W83L786NG_REG_FAN(i));
764 			data->fan_min[i] = w83l786ng_read_value(client,
765 			    W83L786NG_REG_FAN_MIN(i));
766 		}
767 
768 		/* Update the fan divisor */
769 		reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV);
770 		data->fan_div[0] = reg_tmp & 0x07;
771 		data->fan_div[1] = (reg_tmp >> 4) & 0x07;
772 
773 		pwmcfg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
774 		for (i = 0; i < 2; i++) {
775 			data->pwm_mode[i] =
776 			    ((pwmcfg >> W83L786NG_PWM_MODE_SHIFT[i]) & 1)
777 			    ? 0 : 1;
778 			data->pwm_enable[i] =
779 			    ((pwmcfg >> W83L786NG_PWM_ENABLE_SHIFT[i]) & 2) + 1;
780 			data->pwm[i] = w83l786ng_read_value(client,
781 			    W83L786NG_REG_PWM[i]);
782 		}
783 
784 
785 		/* Update the temperature sensors */
786 		for (i = 0; i < 2; i++) {
787 			for (j = 0; j < 3; j++) {
788 				data->temp[i][j] = w83l786ng_read_value(client,
789 				    W83L786NG_REG_TEMP[i][j]);
790 			}
791 		}
792 
793 		/* Update Smart Fan I/II tolerance */
794 		reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_TOLERANCE);
795 		data->tolerance[0] = reg_tmp & 0x0f;
796 		data->tolerance[1] = (reg_tmp >> 4) & 0x0f;
797 
798 		data->last_updated = jiffies;
799 		data->valid = 1;
800 
801 	}
802 
803 	mutex_unlock(&data->update_lock);
804 
805 	return data;
806 }
807 
808 module_i2c_driver(w83l786ng_driver);
809 
810 MODULE_AUTHOR("Kevin Lo");
811 MODULE_DESCRIPTION("w83l786ng driver");
812 MODULE_LICENSE("GPL");
813