aboutsummaryrefslogblamecommitdiffstats
path: root/drivers/hwmon/w83l786ng.c
blob: 0254e181893d9f2e9bd0d010d37f6544559ad3e5 (plain) (tree)
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587




































                                                                           
                                                                          

                       

















































































                                                                              























                                                                               

                                                           
                                                      

                                                         


                                                                          
                                                    
                           



                                       
                                             
                                          


                                       



                                           
                                     
































































































































































































































































































































































































































                                                                                
                                                                        
 
                                                      

                   

                                                                          
                               

         




                                                                                

         










                                                                             

         
                                                        
 


















                                                                          






























                                                                            





                    
                                           

                                                                 



                                                                










































































































                                                                                
/*
    w83l786ng.c - Linux kernel driver for hardware monitoring
    Copyright (c) 2007 Kevin Lo <kevlo@kevlo.org>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation - version 2.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
    02110-1301 USA.
*/

/*
    Supports following chips:

    Chip	#vin	#fanin	#pwm	#temp	wchipid	vendid	i2c	ISA
    w83l786ng	3	2	2	2	0x7b	0x5ca3	yes	no
*/

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-vid.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>

/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x2e, 0x2f, I2C_CLIENT_END };

/* Insmod parameters */

static int reset;
module_param(reset, bool, 0);
MODULE_PARM_DESC(reset, "Set to 1 to reset chip, not recommended");

#define W83L786NG_REG_IN_MIN(nr)	(0x2C + (nr) * 2)
#define W83L786NG_REG_IN_MAX(nr)	(0x2B + (nr) * 2)
#define W83L786NG_REG_IN(nr)		((nr) + 0x20)

#define W83L786NG_REG_FAN(nr)		((nr) + 0x28)
#define W83L786NG_REG_FAN_MIN(nr)	((nr) + 0x3B)

#define W83L786NG_REG_CONFIG		0x40
#define W83L786NG_REG_ALARM1		0x41
#define W83L786NG_REG_ALARM2 		0x42
#define W83L786NG_REG_GPIO_EN		0x47
#define W83L786NG_REG_MAN_ID2		0x4C
#define W83L786NG_REG_MAN_ID1		0x4D
#define W83L786NG_REG_CHIP_ID		0x4E

#define W83L786NG_REG_DIODE		0x53
#define W83L786NG_REG_FAN_DIV		0x54
#define W83L786NG_REG_FAN_CFG		0x80

#define W83L786NG_REG_TOLERANCE		0x8D

static const u8 W83L786NG_REG_TEMP[2][3] = {
	{ 0x25,		/* TEMP 0 in DataSheet */
	  0x35,		/* TEMP 0 Over in DataSheet */
	  0x36 },	/* TEMP 0 Hyst in DataSheet */
	{ 0x26,		/* TEMP 1 in DataSheet */
	  0x37,		/* TEMP 1 Over in DataSheet */
	  0x38 }	/* TEMP 1 Hyst in DataSheet */
};

static const u8 W83L786NG_PWM_MODE_SHIFT[] = {6, 7};
static const u8 W83L786NG_PWM_ENABLE_SHIFT[] = {2, 4};

/* FAN Duty Cycle, be used to control */
static const u8 W83L786NG_REG_PWM[] = {0x81, 0x87};


static inline u8
FAN_TO_REG(long rpm, int div)
{
	if (rpm == 0)
		return 255;
	rpm = SENSORS_LIMIT(rpm, 1, 1000000);
	return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
}

#define FAN_FROM_REG(val,div)	((val) == 0   ? -1 : \
				((val) == 255 ? 0 : \
				1350000 / ((val) * (div))))

/* for temp */
#define TEMP_TO_REG(val)	(SENSORS_LIMIT(((val) < 0 ? (val)+0x100*1000 \
				    : (val)) / 1000, 0, 0xff))
#define TEMP_FROM_REG(val)	(((val) & 0x80 ? (val)-0x100 : (val)) * 1000)

/* The analog voltage inputs have 8mV LSB. Since the sysfs output is
   in mV as would be measured on the chip input pin, need to just
   multiply/divide by 8 to translate from/to register values. */
#define IN_TO_REG(val)          (SENSORS_LIMIT((((val) + 4) / 8), 0, 255))
#define IN_FROM_REG(val)	((val) * 8)

#define DIV_FROM_REG(val)	(1 << (val))

static inline u8
DIV_TO_REG(long val)
{
	int i;
	val = SENSORS_LIMIT(val, 1, 128) >> 1;
	for (i = 0; i < 7; i++) {
		if (val == 0)
			break;
		val >>= 1;
	}
	return ((u8) i);
}

struct w83l786ng_data {
	struct device *hwmon_dev;
	struct mutex update_lock;
	char valid;			/* !=0 if following fields are valid */
	unsigned long last_updated;	/* In jiffies */
	unsigned long last_nonvolatile;	/* In jiffies, last time we update the
					   nonvolatile registers */

	u8 in[3];
	u8 in_max[3];
	u8 in_min[3];
	u8 fan[2];
	u8 fan_div[2];
	u8 fan_min[2];
	u8 temp_type[2];
	u8 temp[2][3];
	u8 pwm[2];
	u8 pwm_mode[2];	/* 0->DC variable voltage
			   1->PWM variable duty cycle */

	u8 pwm_enable[2]; /* 1->manual
			     2->thermal cruise (also called SmartFan I) */
	u8 tolerance[2];
};

static int w83l786ng_probe(struct i2c_client *client,
			   const struct i2c_device_id *id);
static int w83l786ng_detect(struct i2c_client *client,
			    struct i2c_board_info *info);
static int w83l786ng_remove(struct i2c_client *client);
static void w83l786ng_init_client(struct i2c_client *client);
static struct w83l786ng_data *w83l786ng_update_device(struct device *dev);

static const struct i2c_device_id w83l786ng_id[] = {
	{ "w83l786ng", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, w83l786ng_id);

static struct i2c_driver w83l786ng_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		   .name = "w83l786ng",
	},
	.probe		= w83l786ng_probe,
	.remove		= w83l786ng_remove,
	.id_table	= w83l786ng_id,
	.detect		= w83l786ng_detect,
	.address_list	= normal_i2c,
};

static u8
w83l786ng_read_value(struct i2c_client *client, u8 reg)
{
	return i2c_smbus_read_byte_data(client, reg);
}

static int
w83l786ng_write_value(struct i2c_client *client, u8 reg, u8 value)
{
	return i2c_smbus_write_byte_data(client, reg, value);
}

/* following are the sysfs callback functions */
#define show_in_reg(reg) \
static ssize_t \
show_##reg(struct device *dev, struct device_attribute *attr, \
           char *buf) \
{ \
	int nr = to_sensor_dev_attr(attr)->index; \
	struct w83l786ng_data *data = w83l786ng_update_device(dev); \
	return sprintf(buf,"%d\n", IN_FROM_REG(data->reg[nr])); \
}

show_in_reg(in)
show_in_reg(in_min)
show_in_reg(in_max)

#define store_in_reg(REG, reg) \
static ssize_t \
store_in_##reg (struct device *dev, struct device_attribute *attr, \
		const char *buf, size_t count) \
{ \
	int nr = to_sensor_dev_attr(attr)->index; \
	struct i2c_client *client = to_i2c_client(dev); \
	struct w83l786ng_data *data = i2c_get_clientdata(client); \
	unsigned long val = simple_strtoul(buf, NULL, 10); \
	mutex_lock(&data->update_lock); \
	data->in_##reg[nr] = IN_TO_REG(val); \
	w83l786ng_write_value(client, W83L786NG_REG_IN_##REG(nr), \
			      data->in_##reg[nr]); \
	mutex_unlock(&data->update_lock); \
	return count; \
}

store_in_reg(MIN, min)
store_in_reg(MAX, max)

static struct sensor_device_attribute sda_in_input[] = {
	SENSOR_ATTR(in0_input, S_IRUGO, show_in, NULL, 0),
	SENSOR_ATTR(in1_input, S_IRUGO, show_in, NULL, 1),
	SENSOR_ATTR(in2_input, S_IRUGO, show_in, NULL, 2),
};

static struct sensor_device_attribute sda_in_min[] = {
	SENSOR_ATTR(in0_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 0),
	SENSOR_ATTR(in1_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 1),
	SENSOR_ATTR(in2_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 2),
};

static struct sensor_device_attribute sda_in_max[] = {
	SENSOR_ATTR(in0_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 0),
	SENSOR_ATTR(in1_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 1),
	SENSOR_ATTR(in2_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 2),
};

#define show_fan_reg(reg) \
static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
			  char *buf) \
{ \
	int nr = to_sensor_dev_attr(attr)->index; \
	struct w83l786ng_data *data = w83l786ng_update_device(dev); \
        return sprintf(buf,"%d\n", \
                FAN_FROM_REG(data->fan[nr], DIV_FROM_REG(data->fan_div[nr]))); \
}

show_fan_reg(fan);
show_fan_reg(fan_min);

static ssize_t
store_fan_min(struct device *dev, struct device_attribute *attr,
	      const char *buf, size_t count)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct i2c_client *client = to_i2c_client(dev);
	struct w83l786ng_data *data = i2c_get_clientdata(client);
	u32 val;

	val = simple_strtoul(buf, NULL, 10);
	mutex_lock(&data->update_lock);
	data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
	w83l786ng_write_value(client, W83L786NG_REG_FAN_MIN(nr),
			      data->fan_min[nr]);
	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t
show_fan_div(struct device *dev, struct device_attribute *attr,
	     char *buf)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct w83l786ng_data *data = w83l786ng_update_device(dev);
	return sprintf(buf, "%u\n", DIV_FROM_REG(data->fan_div[nr]));
}

/* Note: we save and restore the fan minimum here, because its value is
   determined in part by the fan divisor.  This follows the principle of
   least surprise; the user doesn't expect the fan minimum to change just
   because the divisor changed. */
static ssize_t
store_fan_div(struct device *dev, struct device_attribute *attr,
	      const char *buf, size_t count)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct i2c_client *client = to_i2c_client(dev);
	struct w83l786ng_data *data = i2c_get_clientdata(client);

	unsigned long min;
	u8 tmp_fan_div;
	u8 fan_div_reg;
	u8 keep_mask = 0;
	u8 new_shift = 0;

	/* Save fan_min */
	mutex_lock(&data->update_lock);
	min = FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr]));

	data->fan_div[nr] = DIV_TO_REG(simple_strtoul(buf, NULL, 10));

	switch (nr) {
	case 0:
		keep_mask = 0xf8;
		new_shift = 0;
		break;
	case 1:
		keep_mask = 0x8f;
		new_shift = 4;
		break;
	}

	fan_div_reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV)
					   & keep_mask;

	tmp_fan_div = (data->fan_div[nr] << new_shift) & ~keep_mask;

	w83l786ng_write_value(client, W83L786NG_REG_FAN_DIV,
			      fan_div_reg | tmp_fan_div);

	/* Restore fan_min */
	data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
	w83l786ng_write_value(client, W83L786NG_REG_FAN_MIN(nr),
			      data->fan_min[nr]);
	mutex_unlock(&data->update_lock);

	return count;
}

static struct sensor_device_attribute sda_fan_input[] = {
	SENSOR_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0),
	SENSOR_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1),
};

static struct sensor_device_attribute sda_fan_min[] = {
	SENSOR_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan_min,
		    store_fan_min, 0),
	SENSOR_ATTR(fan2_min, S_IWUSR | S_IRUGO, show_fan_min,
		    store_fan_min, 1),
};

static struct sensor_device_attribute sda_fan_div[] = {
	SENSOR_ATTR(fan1_div, S_IWUSR | S_IRUGO, show_fan_div,
		    store_fan_div, 0),
	SENSOR_ATTR(fan2_div, S_IWUSR | S_IRUGO, show_fan_div,
		    store_fan_div, 1),
};


/* read/write the temperature, includes measured value and limits */

static ssize_t
show_temp(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct sensor_device_attribute_2 *sensor_attr =
	    to_sensor_dev_attr_2(attr);
	int nr = sensor_attr->nr;
	int index = sensor_attr->index;
	struct w83l786ng_data *data = w83l786ng_update_device(dev);
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr][index]));
}

static ssize_t
store_temp(struct device *dev, struct device_attribute *attr,
	   const char *buf, size_t count)
{
	struct sensor_device_attribute_2 *sensor_attr =
	    to_sensor_dev_attr_2(attr);
	int nr = sensor_attr->nr;
	int index = sensor_attr->index;
	struct i2c_client *client = to_i2c_client(dev);
	struct w83l786ng_data *data = i2c_get_clientdata(client);
	s32 val;

	val = simple_strtol(buf, NULL, 10);
	mutex_lock(&data->update_lock);
	data->temp[nr][index] = TEMP_TO_REG(val);
	w83l786ng_write_value(client, W83L786NG_REG_TEMP[nr][index],
			      data->temp[nr][index]);
	mutex_unlock(&data->update_lock);

        return count;
}

static struct sensor_device_attribute_2 sda_temp_input[] = {
	SENSOR_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0),
	SENSOR_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 1, 0),
};

static struct sensor_device_attribute_2 sda_temp_max[] = {
	SENSOR_ATTR_2(temp1_max, S_IRUGO | S_IWUSR,
		      show_temp, store_temp, 0, 1),
	SENSOR_ATTR_2(temp2_max, S_IRUGO | S_IWUSR,
		      show_temp, store_temp, 1, 1),
};

static struct sensor_device_attribute_2 sda_temp_max_hyst[] = {
	SENSOR_ATTR_2(temp1_max_hyst, S_IRUGO | S_IWUSR,
		      show_temp, store_temp, 0, 2),
	SENSOR_ATTR_2(temp2_max_hyst, S_IRUGO | S_IWUSR,
		      show_temp, store_temp, 1, 2),
};

#define show_pwm_reg(reg) \
static ssize_t show_##reg (struct device *dev, struct device_attribute *attr, \
			   char *buf) \
{ \
	struct w83l786ng_data *data = w83l786ng_update_device(dev); \
	int nr = to_sensor_dev_attr(attr)->index; \
	return sprintf(buf, "%d\n", data->reg[nr]); \
}

show_pwm_reg(pwm_mode)
show_pwm_reg(pwm_enable)
show_pwm_reg(pwm)

static ssize_t
store_pwm_mode(struct device *dev, struct device_attribute *attr,
	       const char *buf, size_t count)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct i2c_client *client = to_i2c_client(dev);
	struct w83l786ng_data *data = i2c_get_clientdata(client);
	u32 val = simple_strtoul(buf, NULL, 10);
	u8 reg;

	if (val > 1)
		return -EINVAL;
	mutex_lock(&data->update_lock);
	data->pwm_mode[nr] = val;
	reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
	reg &= ~(1 << W83L786NG_PWM_MODE_SHIFT[nr]);
	if (!val)
		reg |= 1 << W83L786NG_PWM_MODE_SHIFT[nr];
	w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t
store_pwm(struct device *dev, struct device_attribute *attr,
	  const char *buf, size_t count)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct i2c_client *client = to_i2c_client(dev);
	struct w83l786ng_data *data = i2c_get_clientdata(client);
	u32 val = SENSORS_LIMIT(simple_strtoul(buf, NULL, 10), 0, 255);

	mutex_lock(&data->update_lock);
	data->pwm[nr] = val;
	w83l786ng_write_value(client, W83L786NG_REG_PWM[nr], val);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t
store_pwm_enable(struct device *dev, struct device_attribute *attr,
		 const char *buf, size_t count)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct i2c_client *client = to_i2c_client(dev);
	struct w83l786ng_data *data = i2c_get_clientdata(client);
	u32 val = simple_strtoul(buf, NULL, 10);

	u8 reg;

	if (!val || (val > 2))  /* only modes 1 and 2 are supported */
		return -EINVAL;

	mutex_lock(&data->update_lock);
	reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
	data->pwm_enable[nr] = val;
	reg &= ~(0x02 << W83L786NG_PWM_ENABLE_SHIFT[nr]);
	reg |= (val - 1) << W83L786NG_PWM_ENABLE_SHIFT[nr];
	w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg);
	mutex_unlock(&data->update_lock);
	return count;
}

static struct sensor_device_attribute sda_pwm[] = {
	SENSOR_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 0),
	SENSOR_ATTR(pwm2, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 1),
};

static struct sensor_device_attribute sda_pwm_mode[] = {
	SENSOR_ATTR(pwm1_mode, S_IWUSR | S_IRUGO, show_pwm_mode,
		    store_pwm_mode, 0),
	SENSOR_ATTR(pwm2_mode, S_IWUSR | S_IRUGO, show_pwm_mode,
		    store_pwm_mode, 1),
};

static struct sensor_device_attribute sda_pwm_enable[] = {
	SENSOR_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, show_pwm_enable,
		    store_pwm_enable, 0),
	SENSOR_ATTR(pwm2_enable, S_IWUSR | S_IRUGO, show_pwm_enable,
		    store_pwm_enable, 1),
};

/* For Smart Fan I/Thermal Cruise and Smart Fan II */
static ssize_t
show_tolerance(struct device *dev, struct device_attribute *attr, char *buf)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct w83l786ng_data *data = w83l786ng_update_device(dev);
	return sprintf(buf, "%ld\n", (long)data->tolerance[nr]);
}

static ssize_t
store_tolerance(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	int nr = to_sensor_dev_attr(attr)->index;
	struct i2c_client *client = to_i2c_client(dev);
	struct w83l786ng_data *data = i2c_get_clientdata(client);
	u32 val;
	u8 tol_tmp, tol_mask;

	val = simple_strtoul(buf, NULL, 10);

	mutex_lock(&data->update_lock);
	tol_mask = w83l786ng_read_value(client,
	    W83L786NG_REG_TOLERANCE) & ((nr == 1) ? 0x0f : 0xf0);
	tol_tmp = SENSORS_LIMIT(val, 0, 15);
	tol_tmp &= 0x0f;
	data->tolerance[nr] = tol_tmp;
	if (nr == 1) {
		tol_tmp <<= 4;
	}

	w83l786ng_write_value(client, W83L786NG_REG_TOLERANCE,
			      tol_mask | tol_tmp);
	mutex_unlock(&data->update_lock);
	return count;
}

static struct sensor_device_attribute sda_tolerance[] = {
	SENSOR_ATTR(pwm1_tolerance, S_IWUSR | S_IRUGO,
		    show_tolerance, store_tolerance, 0),
	SENSOR_ATTR(pwm2_tolerance, S_IWUSR | S_IRUGO,
		    show_tolerance, store_tolerance, 1),
};


#define IN_UNIT_ATTRS(X)	\
	&sda_in_input[X].dev_attr.attr,		\
	&sda_in_min[X].dev_attr.attr,		\
	&sda_in_max[X].dev_attr.attr

#define FAN_UNIT_ATTRS(X)	\
	&sda_fan_input[X].dev_attr.attr,	\
	&sda_fan_min[X].dev_attr.attr,		\
	&sda_fan_div[X].dev_attr.attr

#define TEMP_UNIT_ATTRS(X)	\
	&sda_temp_input[X].dev_attr.attr,	\
	&sda_temp_max[X].dev_attr.attr,		\
	&sda_temp_max_hyst[X].dev_attr.attr

#define PWM_UNIT_ATTRS(X)	\
	&sda_pwm[X].dev_attr.attr,		\
	&sda_pwm_mode[X].dev_attr.attr,		\
	&sda_pwm_enable[X].dev_attr.attr

#define TOLERANCE_UNIT_ATTRS(X)	\
	&sda_tolerance[X].dev_attr.attr

static struct attribute *w83l786ng_attributes[] = {
	IN_UNIT_ATTRS(0),
	IN_UNIT_ATTRS(1),
	IN_UNIT_ATTRS(2),
	FAN_UNIT_ATTRS(0),
	FAN_UNIT_ATTRS(1),
	TEMP_UNIT_ATTRS(0),
	TEMP_UNIT_ATTRS(1),
	PWM_UNIT_ATTRS(0),
	PWM_UNIT_ATTRS(1),
	TOLERANCE_UNIT_ATTRS(0),
	TOLERANCE_UNIT_ATTRS(1),
	NULL
};

static const struct attribute_group w83l786ng_group = {
	.attrs = w83l786ng_attributes,
};

static int
w83l786ng_detect(struct i2c_client *client, struct i2c_board_info *info)
{
	struct i2c_adapter *adapter = client->adapter;
	u16 man_id;
	u8 chip_id;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
		return -ENODEV;
	}

	/* Detection */
	if ((w83l786ng_read_value(client, W83L786NG_REG_CONFIG) & 0x80)) {
		dev_dbg(&adapter->dev, "W83L786NG detection failed at 0x%02x\n",
			client->addr);
		return -ENODEV;
	}

	/* Identification */
	man_id = (w83l786ng_read_value(client, W83L786NG_REG_MAN_ID1) << 8) +
		 w83l786ng_read_value(client, W83L786NG_REG_MAN_ID2);
	chip_id = w83l786ng_read_value(client, W83L786NG_REG_CHIP_ID);

	if (man_id != 0x5CA3 ||		/* Winbond */
	    chip_id != 0x80) {		/* W83L786NG */
		dev_dbg(&adapter->dev,
			"Unsupported chip (man_id=0x%04X, chip_id=0x%02X)\n",
			man_id, chip_id);
		return -ENODEV;
	}

	strlcpy(info->type, "w83l786ng", I2C_NAME_SIZE);

	return 0;
}

static int
w83l786ng_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	struct w83l786ng_data *data;
	int i, err = 0;
	u8 reg_tmp;

	data = kzalloc(sizeof(struct w83l786ng_data), GFP_KERNEL);
	if (!data) {
		err = -ENOMEM;
		goto exit;
	}

	i2c_set_clientdata(client, data);
	mutex_init(&data->update_lock);

	/* Initialize the chip */
	w83l786ng_init_client(client);

	/* A few vars need to be filled upon startup */
	for (i = 0; i < 2; i++) {
		data->fan_min[i] = w83l786ng_read_value(client,
		    W83L786NG_REG_FAN_MIN(i));
	}

	/* Update the fan divisor */
	reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV);
	data->fan_div[0] = reg_tmp & 0x07;
	data->fan_div[1] = (reg_tmp >> 4) & 0x07;

	/* Register sysfs hooks */
	if ((err = sysfs_create_group(&client->dev.kobj, &w83l786ng_group)))
		goto exit_remove;

	data->hwmon_dev = hwmon_device_register(dev);
	if (IS_ERR(data->hwmon_dev)) {
		err = PTR_ERR(data->hwmon_dev);
		goto exit_remove;
	}

	return 0;

	/* Unregister sysfs hooks */

exit_remove:
	sysfs_remove_group(&client->dev.kobj, &w83l786ng_group);
	kfree(data);
exit:
	return err;
}

static int
w83l786ng_remove(struct i2c_client *client)
{
	struct w83l786ng_data *data = i2c_get_clientdata(client);

	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&client->dev.kobj, &w83l786ng_group);

	kfree(data);

	return 0;
}

static void
w83l786ng_init_client(struct i2c_client *client)
{
	u8 tmp;

	if (reset)
		w83l786ng_write_value(client, W83L786NG_REG_CONFIG, 0x80);

	/* Start monitoring */
	tmp = w83l786ng_read_value(client, W83L786NG_REG_CONFIG);
	if (!(tmp & 0x01))
		w83l786ng_write_value(client, W83L786NG_REG_CONFIG, tmp | 0x01);
}

static struct w83l786ng_data *w83l786ng_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct w83l786ng_data *data = i2c_get_clientdata(client);
	int i, j;
	u8 reg_tmp, pwmcfg;

	mutex_lock(&data->update_lock);
	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	    || !data->valid) {
		dev_dbg(&client->dev, "Updating w83l786ng data.\n");

		/* Update the voltages measured value and limits */
		for (i = 0; i < 3; i++) {
			data->in[i] = w83l786ng_read_value(client,
			    W83L786NG_REG_IN(i));
			data->in_min[i] = w83l786ng_read_value(client,
			    W83L786NG_REG_IN_MIN(i));
			data->in_max[i] = w83l786ng_read_value(client,
			    W83L786NG_REG_IN_MAX(i));
		}

		/* Update the fan counts and limits */
		for (i = 0; i < 2; i++) {
			data->fan[i] = w83l786ng_read_value(client,
			    W83L786NG_REG_FAN(i));
			data->fan_min[i] = w83l786ng_read_value(client,
			    W83L786NG_REG_FAN_MIN(i));
		}

		/* Update the fan divisor */
		reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV);
		data->fan_div[0] = reg_tmp & 0x07;
		data->fan_div[1] = (reg_tmp >> 4) & 0x07;

		pwmcfg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
		for (i = 0; i < 2; i++) {
			data->pwm_mode[i] =
			    ((pwmcfg >> W83L786NG_PWM_MODE_SHIFT[i]) & 1)
			    ? 0 : 1;
			data->pwm_enable[i] =
			    ((pwmcfg >> W83L786NG_PWM_ENABLE_SHIFT[i]) & 2) + 1;
			data->pwm[i] = w83l786ng_read_value(client,
			    W83L786NG_REG_PWM[i]);
		}


		/* Update the temperature sensors */
		for (i = 0; i < 2; i++) {
			for (j = 0; j < 3; j++) {
				data->temp[i][j] = w83l786ng_read_value(client,
				    W83L786NG_REG_TEMP[i][j]);
			}
		}

		/* Update Smart Fan I/II tolerance */
		reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_TOLERANCE);
		data->tolerance[0] = reg_tmp & 0x0f;
		data->tolerance[1] = (reg_tmp >> 4) & 0x0f;

		data->last_updated = jiffies;
		data->valid = 1;

	}

	mutex_unlock(&data->update_lock);

	return data;
}

static int __init
sensors_w83l786ng_init(void)
{
	return i2c_add_driver(&w83l786ng_driver);
}

static void __exit
sensors_w83l786ng_exit(void)
{
	i2c_del_driver(&w83l786ng_driver);
}

MODULE_AUTHOR("Kevin Lo");
MODULE_DESCRIPTION("w83l786ng driver");
MODULE_LICENSE("GPL");

module_init(sensors_w83l786ng_init);
module_exit(sensors_w83l786ng_exit);