w83l786ng.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * w83l786ng.c - Linux kernel driver for hardware monitoring
  4 * Copyright (c) 2007 Kevin Lo <kevlo@kevlo.org>
  5 */
  6
  7/*
  8 * Supports following chips:
  9 *
 10 * Chip		#vin	#fanin	#pwm	#temp	wchipid	vendid	i2c	ISA
 11 * w83l786ng	3	2	2	2	0x7b	0x5ca3	yes	no
 12 */
 13
 14#include <linux/module.h>
 15#include <linux/init.h>
 16#include <linux/slab.h>
 17#include <linux/i2c.h>
 18#include <linux/hwmon.h>
 19#include <linux/hwmon-sysfs.h>
 20#include <linux/err.h>
 21#include <linux/mutex.h>
 22#include <linux/jiffies.h>
 23
 24/* Addresses to scan */
 25static const unsigned short normal_i2c[] = { 0x2e, 0x2f, I2C_CLIENT_END };
 26
 27/* Insmod parameters */
 28
 29static bool reset;
 30module_param(reset, bool, 0);
 31MODULE_PARM_DESC(reset, "Set to 1 to reset chip, not recommended");
 32
 33#define W83L786NG_REG_IN_MIN(nr)	(0x2C + (nr) * 2)
 34#define W83L786NG_REG_IN_MAX(nr)	(0x2B + (nr) * 2)
 35#define W83L786NG_REG_IN(nr)		((nr) + 0x20)
 36
 37#define W83L786NG_REG_FAN(nr)		((nr) + 0x28)
 38#define W83L786NG_REG_FAN_MIN(nr)	((nr) + 0x3B)
 39
 40#define W83L786NG_REG_CONFIG		0x40
 41#define W83L786NG_REG_ALARM1		0x41
 42#define W83L786NG_REG_ALARM2		0x42
 43#define W83L786NG_REG_GPIO_EN		0x47
 44#define W83L786NG_REG_MAN_ID2		0x4C
 45#define W83L786NG_REG_MAN_ID1		0x4D
 46#define W83L786NG_REG_CHIP_ID		0x4E
 47
 48#define W83L786NG_REG_DIODE		0x53
 49#define W83L786NG_REG_FAN_DIV		0x54
 50#define W83L786NG_REG_FAN_CFG		0x80
 51
 52#define W83L786NG_REG_TOLERANCE		0x8D
 53
 54static const u8 W83L786NG_REG_TEMP[2][3] = {
 55	{ 0x25,		/* TEMP 0 in DataSheet */
 56	  0x35,		/* TEMP 0 Over in DataSheet */
 57	  0x36 },	/* TEMP 0 Hyst in DataSheet */
 58	{ 0x26,		/* TEMP 1 in DataSheet */
 59	  0x37,		/* TEMP 1 Over in DataSheet */
 60	  0x38 }	/* TEMP 1 Hyst in DataSheet */
 61};
 62
 63static const u8 W83L786NG_PWM_MODE_SHIFT[] = {6, 7};
 64static const u8 W83L786NG_PWM_ENABLE_SHIFT[] = {2, 4};
 65
 66/* FAN Duty Cycle, be used to control */
 67static const u8 W83L786NG_REG_PWM[] = {0x81, 0x87};
 68
 69
 70static inline u8
 71FAN_TO_REG(long rpm, int div)
 72{
 73	if (rpm == 0)
 74		return 255;
 75	rpm = clamp_val(rpm, 1, 1000000);
 76	return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
 77}
 78
 79static int fan_from_reg(int val, int div)
 80{
 81	if (val == 0)
 82		return -1;
 83	if (val == 255)
 84		return 0;
 85	return 1350000 / (val * div);
 86}
 87
 88/* for temp */
 89#define TEMP_TO_REG(val)	(clamp_val(((val) < 0 ? (val) + 0x100 * 1000 \
 90						      : (val)) / 1000, 0, 0xff))
 91
 92static int temp_from_reg(int val)
 93{
 94	if (val & 0x80)
 95		return (val - 0x100) * 1000;
 96	return val * 1000;
 97}
 98
 99/*
100 * The analog voltage inputs have 8mV LSB. Since the sysfs output is
101 * in mV as would be measured on the chip input pin, need to just
102 * multiply/divide by 8 to translate from/to register values.
103 */
104#define IN_TO_REG(val)		(clamp_val((((val) + 4) / 8), 0, 255))
105#define IN_FROM_REG(val)	((val) * 8)
106
107#define DIV_FROM_REG(val)	(1 << (val))
108
109static inline u8
110DIV_TO_REG(long val)
111{
112	int i;
113	val = clamp_val(val, 1, 128) >> 1;
114	for (i = 0; i < 7; i++) {
115		if (val == 0)
116			break;
117		val >>= 1;
118	}
119	return (u8)i;
120}
121
122struct w83l786ng_data {
123	struct i2c_client *client;
124	struct mutex update_lock;
125	bool valid;			/* true if following fields are valid */
126	unsigned long last_updated;	/* In jiffies */
127	unsigned long last_nonvolatile;	/* In jiffies, last time we update the
128					 * nonvolatile registers */
129
130	u8 in[3];
131	u8 in_max[3];
132	u8 in_min[3];
133	u8 fan[2];
134	u8 fan_div[2];
135	u8 fan_min[2];
136	u8 temp_type[2];
137	u8 temp[2][3];
138	u8 pwm[2];
139	u8 pwm_mode[2];	/* 0->DC variable voltage
140			 * 1->PWM variable duty cycle */
141
142	u8 pwm_enable[2]; /* 1->manual
143			   * 2->thermal cruise (also called SmartFan I) */
144	u8 tolerance[2];
145};
146
147static u8
148w83l786ng_read_value(struct i2c_client *client, u8 reg)
149{
150	return i2c_smbus_read_byte_data(client, reg);
151}
152
153static int
154w83l786ng_write_value(struct i2c_client *client, u8 reg, u8 value)
155{
156	return i2c_smbus_write_byte_data(client, reg, value);
157}
158
159static struct w83l786ng_data *w83l786ng_update_device(struct device *dev)
160{
161	struct w83l786ng_data *data = dev_get_drvdata(dev);
162	struct i2c_client *client = data->client;
163	int i, j;
164	u8 reg_tmp, pwmcfg;
165
166	mutex_lock(&data->update_lock);
167	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
168	    || !data->valid) {
169		dev_dbg(&client->dev, "Updating w83l786ng data.\n");
170
171		/* Update the voltages measured value and limits */
172		for (i = 0; i < 3; i++) {
173			data->in[i] = w83l786ng_read_value(client,
174			    W83L786NG_REG_IN(i));
175			data->in_min[i] = w83l786ng_read_value(client,
176			    W83L786NG_REG_IN_MIN(i));
177			data->in_max[i] = w83l786ng_read_value(client,
178			    W83L786NG_REG_IN_MAX(i));
179		}
180
181		/* Update the fan counts and limits */
182		for (i = 0; i < 2; i++) {
183			data->fan[i] = w83l786ng_read_value(client,
184			    W83L786NG_REG_FAN(i));
185			data->fan_min[i] = w83l786ng_read_value(client,
186			    W83L786NG_REG_FAN_MIN(i));
187		}
188
189		/* Update the fan divisor */
190		reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV);
191		data->fan_div[0] = reg_tmp & 0x07;
192		data->fan_div[1] = (reg_tmp >> 4) & 0x07;
193
194		pwmcfg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
195		for (i = 0; i < 2; i++) {
196			data->pwm_mode[i] =
197			    ((pwmcfg >> W83L786NG_PWM_MODE_SHIFT[i]) & 1)
198			    ? 0 : 1;
199			data->pwm_enable[i] =
200			    ((pwmcfg >> W83L786NG_PWM_ENABLE_SHIFT[i]) & 3) + 1;
201			data->pwm[i] =
202			    (w83l786ng_read_value(client, W83L786NG_REG_PWM[i])
203			     & 0x0f) * 0x11;
204		}
205
206
207		/* Update the temperature sensors */
208		for (i = 0; i < 2; i++) {
209			for (j = 0; j < 3; j++) {
210				data->temp[i][j] = w83l786ng_read_value(client,
211				    W83L786NG_REG_TEMP[i][j]);
212			}
213		}
214
215		/* Update Smart Fan I/II tolerance */
216		reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_TOLERANCE);
217		data->tolerance[0] = reg_tmp & 0x0f;
218		data->tolerance[1] = (reg_tmp >> 4) & 0x0f;
219
220		data->last_updated = jiffies;
221		data->valid = true;
222
223	}
224
225	mutex_unlock(&data->update_lock);
226
227	return data;
228}
229
230/* following are the sysfs callback functions */
231#define show_in_reg(reg) \
232static ssize_t \
233show_##reg(struct device *dev, struct device_attribute *attr, \
234	   char *buf) \
235{ \
236	int nr = to_sensor_dev_attr(attr)->index; \
237	struct w83l786ng_data *data = w83l786ng_update_device(dev); \
238	return sprintf(buf, "%d\n", IN_FROM_REG(data->reg[nr])); \
239}
240
241show_in_reg(in)
242show_in_reg(in_min)
243show_in_reg(in_max)
244
245#define store_in_reg(REG, reg) \
246static ssize_t \
247store_in_##reg(struct device *dev, struct device_attribute *attr, \
248	       const char *buf, size_t count) \
249{ \
250	int nr = to_sensor_dev_attr(attr)->index; \
251	struct w83l786ng_data *data = dev_get_drvdata(dev); \
252	struct i2c_client *client = data->client; \
253	unsigned long val; \
254	int err = kstrtoul(buf, 10, &val); \
255	if (err) \
256		return err; \
257	mutex_lock(&data->update_lock); \
258	data->in_##reg[nr] = IN_TO_REG(val); \
259	w83l786ng_write_value(client, W83L786NG_REG_IN_##REG(nr), \
260			      data->in_##reg[nr]); \
261	mutex_unlock(&data->update_lock); \
262	return count; \
263}
264
265store_in_reg(MIN, min)
266store_in_reg(MAX, max)
267
268static struct sensor_device_attribute sda_in_input[] = {
269	SENSOR_ATTR(in0_input, S_IRUGO, show_in, NULL, 0),
270	SENSOR_ATTR(in1_input, S_IRUGO, show_in, NULL, 1),
271	SENSOR_ATTR(in2_input, S_IRUGO, show_in, NULL, 2),
272};
273
274static struct sensor_device_attribute sda_in_min[] = {
275	SENSOR_ATTR(in0_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 0),
276	SENSOR_ATTR(in1_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 1),
277	SENSOR_ATTR(in2_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 2),
278};
279
280static struct sensor_device_attribute sda_in_max[] = {
281	SENSOR_ATTR(in0_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 0),
282	SENSOR_ATTR(in1_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 1),
283	SENSOR_ATTR(in2_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 2),
284};
285
286#define show_fan_reg(reg) \
287static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
288			  char *buf) \
289{ \
290	int nr = to_sensor_dev_attr(attr)->index; \
291	struct w83l786ng_data *data = w83l786ng_update_device(dev); \
292	return sprintf(buf, "%d\n", \
293		fan_from_reg(data->reg[nr], DIV_FROM_REG(data->fan_div[nr]))); \
294}
295
296show_fan_reg(fan);
297show_fan_reg(fan_min);
298
299static ssize_t
300store_fan_min(struct device *dev, struct device_attribute *attr,
301	      const char *buf, size_t count)
302{
303	int nr = to_sensor_dev_attr(attr)->index;
304	struct w83l786ng_data *data = dev_get_drvdata(dev);
305	struct i2c_client *client = data->client;
306	unsigned long val;
307	int err;
308
309	err = kstrtoul(buf, 10, &val);
310	if (err)
311		return err;
312
313	mutex_lock(&data->update_lock);
314	data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
315	w83l786ng_write_value(client, W83L786NG_REG_FAN_MIN(nr),
316			      data->fan_min[nr]);
317	mutex_unlock(&data->update_lock);
318
319	return count;
320}
321
322static ssize_t
323show_fan_div(struct device *dev, struct device_attribute *attr,
324	     char *buf)
325{
326	int nr = to_sensor_dev_attr(attr)->index;
327	struct w83l786ng_data *data = w83l786ng_update_device(dev);
328	return sprintf(buf, "%u\n", DIV_FROM_REG(data->fan_div[nr]));
329}
330
331/*
332 * Note: we save and restore the fan minimum here, because its value is
333 * determined in part by the fan divisor.  This follows the principle of
334 * least surprise; the user doesn't expect the fan minimum to change just
335 * because the divisor changed.
336 */
337static ssize_t
338store_fan_div(struct device *dev, struct device_attribute *attr,
339	      const char *buf, size_t count)
340{
341	int nr = to_sensor_dev_attr(attr)->index;
342	struct w83l786ng_data *data = dev_get_drvdata(dev);
343	struct i2c_client *client = data->client;
344
345	unsigned long min;
346	u8 tmp_fan_div;
347	u8 fan_div_reg;
348	u8 keep_mask = 0;
349	u8 new_shift = 0;
350
351	unsigned long val;
352	int err;
353
354	err = kstrtoul(buf, 10, &val);
355	if (err)
356		return err;
357
358	/* Save fan_min */
359	mutex_lock(&data->update_lock);
360	min = fan_from_reg(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr]));
361
362	data->fan_div[nr] = DIV_TO_REG(val);
363
364	switch (nr) {
365	case 0:
366		keep_mask = 0xf8;
367		new_shift = 0;
368		break;
369	case 1:
370		keep_mask = 0x8f;
371		new_shift = 4;
372		break;
373	}
374
375	fan_div_reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV)
376					   & keep_mask;
377
378	tmp_fan_div = (data->fan_div[nr] << new_shift) & ~keep_mask;
379
380	w83l786ng_write_value(client, W83L786NG_REG_FAN_DIV,
381			      fan_div_reg | tmp_fan_div);
382
383	/* Restore fan_min */
384	data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
385	w83l786ng_write_value(client, W83L786NG_REG_FAN_MIN(nr),
386			      data->fan_min[nr]);
387	mutex_unlock(&data->update_lock);
388
389	return count;
390}
391
392static struct sensor_device_attribute sda_fan_input[] = {
393	SENSOR_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0),
394	SENSOR_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1),
395};
396
397static struct sensor_device_attribute sda_fan_min[] = {
398	SENSOR_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan_min,
399		    store_fan_min, 0),
400	SENSOR_ATTR(fan2_min, S_IWUSR | S_IRUGO, show_fan_min,
401		    store_fan_min, 1),
402};
403
404static struct sensor_device_attribute sda_fan_div[] = {
405	SENSOR_ATTR(fan1_div, S_IWUSR | S_IRUGO, show_fan_div,
406		    store_fan_div, 0),
407	SENSOR_ATTR(fan2_div, S_IWUSR | S_IRUGO, show_fan_div,
408		    store_fan_div, 1),
409};
410
411
412/* read/write the temperature, includes measured value and limits */
413
414static ssize_t
415show_temp(struct device *dev, struct device_attribute *attr, char *buf)
416{
417	struct sensor_device_attribute_2 *sensor_attr =
418	    to_sensor_dev_attr_2(attr);
419	int nr = sensor_attr->nr;
420	int index = sensor_attr->index;
421	struct w83l786ng_data *data = w83l786ng_update_device(dev);
422	return sprintf(buf, "%d\n", temp_from_reg(data->temp[nr][index]));
423}
424
425static ssize_t
426store_temp(struct device *dev, struct device_attribute *attr,
427	   const char *buf, size_t count)
428{
429	struct sensor_device_attribute_2 *sensor_attr =
430	    to_sensor_dev_attr_2(attr);
431	int nr = sensor_attr->nr;
432	int index = sensor_attr->index;
433	struct w83l786ng_data *data = dev_get_drvdata(dev);
434	struct i2c_client *client = data->client;
435	long val;
436	int err;
437
438	err = kstrtol(buf, 10, &val);
439	if (err)
440		return err;
441
442	mutex_lock(&data->update_lock);
443	data->temp[nr][index] = TEMP_TO_REG(val);
444	w83l786ng_write_value(client, W83L786NG_REG_TEMP[nr][index],
445			      data->temp[nr][index]);
446	mutex_unlock(&data->update_lock);
447
448	return count;
449}
450
451static struct sensor_device_attribute_2 sda_temp_input[] = {
452	SENSOR_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0),
453	SENSOR_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 1, 0),
454};
455
456static struct sensor_device_attribute_2 sda_temp_max[] = {
457	SENSOR_ATTR_2(temp1_max, S_IRUGO | S_IWUSR,
458		      show_temp, store_temp, 0, 1),
459	SENSOR_ATTR_2(temp2_max, S_IRUGO | S_IWUSR,
460		      show_temp, store_temp, 1, 1),
461};
462
463static struct sensor_device_attribute_2 sda_temp_max_hyst[] = {
464	SENSOR_ATTR_2(temp1_max_hyst, S_IRUGO | S_IWUSR,
465		      show_temp, store_temp, 0, 2),
466	SENSOR_ATTR_2(temp2_max_hyst, S_IRUGO | S_IWUSR,
467		      show_temp, store_temp, 1, 2),
468};
469
470#define show_pwm_reg(reg) \
471static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
472			  char *buf) \
473{ \
474	struct w83l786ng_data *data = w83l786ng_update_device(dev); \
475	int nr = to_sensor_dev_attr(attr)->index; \
476	return sprintf(buf, "%d\n", data->reg[nr]); \
477}
478
479show_pwm_reg(pwm_mode)
480show_pwm_reg(pwm_enable)
481show_pwm_reg(pwm)
482
483static ssize_t
484store_pwm_mode(struct device *dev, struct device_attribute *attr,
485	       const char *buf, size_t count)
486{
487	int nr = to_sensor_dev_attr(attr)->index;
488	struct w83l786ng_data *data = dev_get_drvdata(dev);
489	struct i2c_client *client = data->client;
490	u8 reg;
491	unsigned long val;
492	int err;
493
494	err = kstrtoul(buf, 10, &val);
495	if (err)
496		return err;
497
498	if (val > 1)
499		return -EINVAL;
500	mutex_lock(&data->update_lock);
501	data->pwm_mode[nr] = val;
502	reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
503	reg &= ~(1 << W83L786NG_PWM_MODE_SHIFT[nr]);
504	if (!val)
505		reg |= 1 << W83L786NG_PWM_MODE_SHIFT[nr];
506	w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg);
507	mutex_unlock(&data->update_lock);
508	return count;
509}
510
511static ssize_t
512store_pwm(struct device *dev, struct device_attribute *attr,
513	  const char *buf, size_t count)
514{
515	int nr = to_sensor_dev_attr(attr)->index;
516	struct w83l786ng_data *data = dev_get_drvdata(dev);
517	struct i2c_client *client = data->client;
518	unsigned long val;
519	int err;
520
521	err = kstrtoul(buf, 10, &val);
522	if (err)
523		return err;
524	val = clamp_val(val, 0, 255);
525	val = DIV_ROUND_CLOSEST(val, 0x11);
526
527	mutex_lock(&data->update_lock);
528	data->pwm[nr] = val * 0x11;
529	val |= w83l786ng_read_value(client, W83L786NG_REG_PWM[nr]) & 0xf0;
530	w83l786ng_write_value(client, W83L786NG_REG_PWM[nr], val);
531	mutex_unlock(&data->update_lock);
532	return count;
533}
534
535static ssize_t
536store_pwm_enable(struct device *dev, struct device_attribute *attr,
537		 const char *buf, size_t count)
538{
539	int nr = to_sensor_dev_attr(attr)->index;
540	struct w83l786ng_data *data = dev_get_drvdata(dev);
541	struct i2c_client *client = data->client;
542	u8 reg;
543	unsigned long val;
544	int err;
545
546	err = kstrtoul(buf, 10, &val);
547	if (err)
548		return err;
549
550	if (!val || val > 2)  /* only modes 1 and 2 are supported */
551		return -EINVAL;
552
553	mutex_lock(&data->update_lock);
554	reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);
555	data->pwm_enable[nr] = val;
556	reg &= ~(0x03 << W83L786NG_PWM_ENABLE_SHIFT[nr]);
557	reg |= (val - 1) << W83L786NG_PWM_ENABLE_SHIFT[nr];
558	w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg);
559	mutex_unlock(&data->update_lock);
560	return count;
561}
562
563static struct sensor_device_attribute sda_pwm[] = {
564	SENSOR_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 0),
565	SENSOR_ATTR(pwm2, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 1),
566};
567
568static struct sensor_device_attribute sda_pwm_mode[] = {
569	SENSOR_ATTR(pwm1_mode, S_IWUSR | S_IRUGO, show_pwm_mode,
570		    store_pwm_mode, 0),
571	SENSOR_ATTR(pwm2_mode, S_IWUSR | S_IRUGO, show_pwm_mode,
572		    store_pwm_mode, 1),
573};
574
575static struct sensor_device_attribute sda_pwm_enable[] = {
576	SENSOR_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, show_pwm_enable,
577		    store_pwm_enable, 0),
578	SENSOR_ATTR(pwm2_enable, S_IWUSR | S_IRUGO, show_pwm_enable,
579		    store_pwm_enable, 1),
580};
581
582/* For Smart Fan I/Thermal Cruise and Smart Fan II */
583static ssize_t
584show_tolerance(struct device *dev, struct device_attribute *attr, char *buf)
585{
586	int nr = to_sensor_dev_attr(attr)->index;
587	struct w83l786ng_data *data = w83l786ng_update_device(dev);
588	return sprintf(buf, "%ld\n", (long)data->tolerance[nr]);
589}
590
591static ssize_t
592store_tolerance(struct device *dev, struct device_attribute *attr,
593		const char *buf, size_t count)
594{
595	int nr = to_sensor_dev_attr(attr)->index;
596	struct w83l786ng_data *data = dev_get_drvdata(dev);
597	struct i2c_client *client = data->client;
598	u8 tol_tmp, tol_mask;
599	unsigned long val;
600	int err;
601
602	err = kstrtoul(buf, 10, &val);
603	if (err)
604		return err;
605
606	mutex_lock(&data->update_lock);
607	tol_mask = w83l786ng_read_value(client,
608	    W83L786NG_REG_TOLERANCE) & ((nr == 1) ? 0x0f : 0xf0);
609	tol_tmp = clamp_val(val, 0, 15);
610	tol_tmp &= 0x0f;
611	data->tolerance[nr] = tol_tmp;
612	if (nr == 1)
613		tol_tmp <<= 4;
614
615	w83l786ng_write_value(client, W83L786NG_REG_TOLERANCE,
616			      tol_mask | tol_tmp);
617	mutex_unlock(&data->update_lock);
618	return count;
619}
620
621static struct sensor_device_attribute sda_tolerance[] = {
622	SENSOR_ATTR(pwm1_tolerance, S_IWUSR | S_IRUGO,
623		    show_tolerance, store_tolerance, 0),
624	SENSOR_ATTR(pwm2_tolerance, S_IWUSR | S_IRUGO,
625		    show_tolerance, store_tolerance, 1),
626};
627
628
629#define IN_UNIT_ATTRS(X)	\
630	&sda_in_input[X].dev_attr.attr,		\
631	&sda_in_min[X].dev_attr.attr,		\
632	&sda_in_max[X].dev_attr.attr
633
634#define FAN_UNIT_ATTRS(X)	\
635	&sda_fan_input[X].dev_attr.attr,	\
636	&sda_fan_min[X].dev_attr.attr,		\
637	&sda_fan_div[X].dev_attr.attr
638
639#define TEMP_UNIT_ATTRS(X)	\
640	&sda_temp_input[X].dev_attr.attr,	\
641	&sda_temp_max[X].dev_attr.attr,		\
642	&sda_temp_max_hyst[X].dev_attr.attr
643
644#define PWM_UNIT_ATTRS(X)	\
645	&sda_pwm[X].dev_attr.attr,		\
646	&sda_pwm_mode[X].dev_attr.attr,		\
647	&sda_pwm_enable[X].dev_attr.attr
648
649#define TOLERANCE_UNIT_ATTRS(X)	\
650	&sda_tolerance[X].dev_attr.attr
651
652static struct attribute *w83l786ng_attrs[] = {
653	IN_UNIT_ATTRS(0),
654	IN_UNIT_ATTRS(1),
655	IN_UNIT_ATTRS(2),
656	FAN_UNIT_ATTRS(0),
657	FAN_UNIT_ATTRS(1),
658	TEMP_UNIT_ATTRS(0),
659	TEMP_UNIT_ATTRS(1),
660	PWM_UNIT_ATTRS(0),
661	PWM_UNIT_ATTRS(1),
662	TOLERANCE_UNIT_ATTRS(0),
663	TOLERANCE_UNIT_ATTRS(1),
664	NULL
665};
666
667ATTRIBUTE_GROUPS(w83l786ng);
668
669static int
670w83l786ng_detect(struct i2c_client *client, struct i2c_board_info *info)
671{
672	struct i2c_adapter *adapter = client->adapter;
673	u16 man_id;
674	u8 chip_id;
675
676	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
677		return -ENODEV;
678
679	/* Detection */
680	if ((w83l786ng_read_value(client, W83L786NG_REG_CONFIG) & 0x80)) {
681		dev_dbg(&adapter->dev, "W83L786NG detection failed at 0x%02x\n",
682			client->addr);
683		return -ENODEV;
684	}
685
686	/* Identification */
687	man_id = (w83l786ng_read_value(client, W83L786NG_REG_MAN_ID1) << 8) +
688		 w83l786ng_read_value(client, W83L786NG_REG_MAN_ID2);
689	chip_id = w83l786ng_read_value(client, W83L786NG_REG_CHIP_ID);
690
691	if (man_id != 0x5CA3 ||		/* Winbond */
692	    chip_id != 0x80) {		/* W83L786NG */
693		dev_dbg(&adapter->dev,
694			"Unsupported chip (man_id=0x%04X, chip_id=0x%02X)\n",
695			man_id, chip_id);
696		return -ENODEV;
697	}
698
699	strscpy(info->type, "w83l786ng", I2C_NAME_SIZE);
700
701	return 0;
702}
703
704static void w83l786ng_init_client(struct i2c_client *client)
705{
706	u8 tmp;
707
708	if (reset)
709		w83l786ng_write_value(client, W83L786NG_REG_CONFIG, 0x80);
710
711	/* Start monitoring */
712	tmp = w83l786ng_read_value(client, W83L786NG_REG_CONFIG);
713	if (!(tmp & 0x01))
714		w83l786ng_write_value(client, W83L786NG_REG_CONFIG, tmp | 0x01);
715}
716
717static int
718w83l786ng_probe(struct i2c_client *client)
719{
720	struct device *dev = &client->dev;
721	struct w83l786ng_data *data;
722	struct device *hwmon_dev;
723	int i;
724	u8 reg_tmp;
725
726	data = devm_kzalloc(dev, sizeof(struct w83l786ng_data), GFP_KERNEL);
727	if (!data)
728		return -ENOMEM;
729
730	data->client = client;
731	mutex_init(&data->update_lock);
732
733	/* Initialize the chip */
734	w83l786ng_init_client(client);
735
736	/* A few vars need to be filled upon startup */
737	for (i = 0; i < 2; i++) {
738		data->fan_min[i] = w83l786ng_read_value(client,
739		    W83L786NG_REG_FAN_MIN(i));
740	}
741
742	/* Update the fan divisor */
743	reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV);
744	data->fan_div[0] = reg_tmp & 0x07;
745	data->fan_div[1] = (reg_tmp >> 4) & 0x07;
746
747	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
748							   data,
749							   w83l786ng_groups);
750	return PTR_ERR_OR_ZERO(hwmon_dev);
751}
752
753static const struct i2c_device_id w83l786ng_id[] = {
754	{ "w83l786ng" },
755	{ }
756};
757MODULE_DEVICE_TABLE(i2c, w83l786ng_id);
758
759static struct i2c_driver w83l786ng_driver = {
760	.class		= I2C_CLASS_HWMON,
761	.driver = {
762		   .name = "w83l786ng",
763	},
764	.probe		= w83l786ng_probe,
765	.id_table	= w83l786ng_id,
766	.detect		= w83l786ng_detect,
767	.address_list	= normal_i2c,
768};
769
770module_i2c_driver(w83l786ng_driver);
771
772MODULE_AUTHOR("Kevin Lo");
773MODULE_DESCRIPTION("w83l786ng driver");
774MODULE_LICENSE("GPL");