1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * adm9240.c	Part of lm_sensors, Linux kernel modules for hardware
  4 *		monitoring
  5 *
  6 * Copyright (C) 1999	Frodo Looijaard <frodol@dds.nl>
  7 *			Philip Edelbrock <phil@netroedge.com>
  8 * Copyright (C) 2003	Michiel Rook <michiel@grendelproject.nl>
  9 * Copyright (C) 2005	Grant Coady <gcoady.lk@gmail.com> with valuable
 10 *				guidance from Jean Delvare
 11 *
 12 * Driver supports	Analog Devices		ADM9240
 13 *			Dallas Semiconductor	DS1780
 14 *			National Semiconductor	LM81
 15 *
 16 * ADM9240 is the reference, DS1780 and LM81 are register compatibles
 17 *
 18 * Voltage	Six inputs are scaled by chip, VID also reported
 19 * Temperature	Chip temperature to 0.5'C, maximum and max_hysteris
 20 * Fans		2 fans, low speed alarm, automatic fan clock divider
 21 * Alarms	16-bit map of active alarms
 22 * Analog Out	0..1250 mV output
 23 *
 24 * Chassis Intrusion: clear CI latch with 'echo 0 > intrusion0_alarm'
 25 *
 26 * Test hardware: Intel SE440BX-2 desktop motherboard --Grant
 27 *
 28 * LM81 extended temp reading not implemented
 29 */
 30
 31#include <linux/bits.h>
 32#include <linux/init.h>
 33#include <linux/module.h>
 34#include <linux/slab.h>
 35#include <linux/i2c.h>
 36#include <linux/hwmon-sysfs.h>
 37#include <linux/hwmon.h>
 38#include <linux/hwmon-vid.h>
 39#include <linux/err.h>
 40#include <linux/mutex.h>
 41#include <linux/regmap.h>
 42
 43/* Addresses to scan */
 44static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
 45					I2C_CLIENT_END };
 46
 47enum chips { adm9240, ds1780, lm81 };
 48
 49/* ADM9240 registers */
 50#define ADM9240_REG_MAN_ID		0x3e
 51#define ADM9240_REG_DIE_REV		0x3f
 52#define ADM9240_REG_CONFIG		0x40
 53
 54#define ADM9240_REG_IN(nr)		(0x20 + (nr))   /* 0..5 */
 55#define ADM9240_REG_IN_MAX(nr)		(0x2b + (nr) * 2)
 56#define ADM9240_REG_IN_MIN(nr)		(0x2c + (nr) * 2)
 57#define ADM9240_REG_FAN(nr)		(0x28 + (nr))   /* 0..1 */
 58#define ADM9240_REG_FAN_MIN(nr)		(0x3b + (nr))
 59#define ADM9240_REG_INT(nr)		(0x41 + (nr))
 60#define ADM9240_REG_INT_MASK(nr)	(0x43 + (nr))
 61#define ADM9240_REG_TEMP		0x27
 62#define ADM9240_REG_TEMP_MAX(nr)	(0x39 + (nr)) /* 0, 1 = high, hyst */
 63#define ADM9240_REG_ANALOG_OUT		0x19
 64#define ADM9240_REG_CHASSIS_CLEAR	0x46
 65#define ADM9240_REG_VID_FAN_DIV		0x47
 66#define ADM9240_REG_I2C_ADDR		0x48
 67#define ADM9240_REG_VID4		0x49
 68#define ADM9240_REG_TEMP_CONF		0x4b
 69
 70/* generalised scaling with integer rounding */
 71static inline int SCALE(long val, int mul, int div)
 72{
 73	if (val < 0)
 74		return (val * mul - div / 2) / div;
 75	else
 76		return (val * mul + div / 2) / div;
 77}
 78
 79/* adm9240 internally scales voltage measurements */
 80static const u16 nom_mv[] = { 2500, 2700, 3300, 5000, 12000, 2700 };
 81
 82static inline unsigned int IN_FROM_REG(u8 reg, int n)
 83{
 84	return SCALE(reg, nom_mv[n], 192);
 85}
 86
 87static inline u8 IN_TO_REG(unsigned long val, int n)
 88{
 89	val = clamp_val(val, 0, nom_mv[n] * 255 / 192);
 90	return SCALE(val, 192, nom_mv[n]);
 91}
 92
 93/* temperature range: -40..125, 127 disables temperature alarm */
 94static inline s8 TEMP_TO_REG(long val)
 95{
 96	val = clamp_val(val, -40000, 127000);
 97	return SCALE(val, 1, 1000);
 98}
 99
100/* two fans, each with low fan speed limit */
101static inline unsigned int FAN_FROM_REG(u8 reg, u8 div)
102{
103	if (!reg) /* error */
104		return -1;
105
106	if (reg == 255)
107		return 0;
108
109	return SCALE(1350000, 1, reg * div);
110}
111
112/* analog out 0..1250mV */
113static inline u8 AOUT_TO_REG(unsigned long val)
114{
115	val = clamp_val(val, 0, 1250);
116	return SCALE(val, 255, 1250);
117}
118
119static inline unsigned int AOUT_FROM_REG(u8 reg)
120{
121	return SCALE(reg, 1250, 255);
122}
123
124/* per client data */
125struct adm9240_data {
126	struct device *dev;
127	struct regmap *regmap;
128	struct mutex update_lock;
129
130	u8 fan_div[2];		/* rw	fan1_div, read-only accessor */
131	u8 vrm;			/* --	vrm set on startup, no accessor */
132};
133
134/* write new fan div, callers must hold data->update_lock */
135static int adm9240_write_fan_div(struct adm9240_data *data, int channel, u8 fan_div)
136{
137	unsigned int reg, old, shift = (channel + 2) * 2;
138	int err;
139
140	err = regmap_read(data->regmap, ADM9240_REG_VID_FAN_DIV, &reg);
141	if (err < 0)
142		return err;
143	old = (reg >> shift) & 3;
144	reg &= ~(3 << shift);
145	reg |= (fan_div << shift);
146	err = regmap_write(data->regmap, ADM9240_REG_VID_FAN_DIV, reg);
147	if (err < 0)
148		return err;
149	dev_dbg(data->dev,
150		"fan%d clock divider changed from %lu to %lu\n",
151		channel + 1, BIT(old), BIT(fan_div));
152
153	return 0;
154}
155
156/*
157 * set fan speed low limit:
158 *
159 * - value is zero: disable fan speed low limit alarm
160 *
161 * - value is below fan speed measurement range: enable fan speed low
162 *   limit alarm to be asserted while fan speed too slow to measure
163 *
164 * - otherwise: select fan clock divider to suit fan speed low limit,
165 *   measurement code may adjust registers to ensure fan speed reading
166 */
167static int adm9240_fan_min_write(struct adm9240_data *data, int channel, long val)
168{
169	u8 new_div;
170	u8 fan_min;
171	int err;
172
173	mutex_lock(&data->update_lock);
174
175	if (!val) {
176		fan_min = 255;
177		new_div = data->fan_div[channel];
178
179		dev_dbg(data->dev, "fan%u low limit set disabled\n", channel + 1);
180	} else if (val < 1350000 / (8 * 254)) {
181		new_div = 3;
182		fan_min = 254;
183
184		dev_dbg(data->dev, "fan%u low limit set minimum %u\n",
185			channel + 1, FAN_FROM_REG(254, BIT(new_div)));
186	} else {
187		unsigned int new_min = 1350000 / val;
188
189		new_div = 0;
190		while (new_min > 192 && new_div < 3) {
191			new_div++;
192			new_min /= 2;
193		}
194		if (!new_min) /* keep > 0 */
195			new_min++;
196
197		fan_min = new_min;
198
199		dev_dbg(data->dev, "fan%u low limit set fan speed %u\n",
200			channel + 1, FAN_FROM_REG(new_min, BIT(new_div)));
201	}
202
203	if (new_div != data->fan_div[channel]) {
204		data->fan_div[channel] = new_div;
205		adm9240_write_fan_div(data, channel, new_div);
206	}
207	err = regmap_write(data->regmap, ADM9240_REG_FAN_MIN(channel), fan_min);
208
209	mutex_unlock(&data->update_lock);
210
211	return err;
212}
213
214static ssize_t cpu0_vid_show(struct device *dev,
215			     struct device_attribute *attr, char *buf)
216{
217	struct adm9240_data *data = dev_get_drvdata(dev);
218	unsigned int regval;
219	int err;
220	u8 vid;
221
222	err = regmap_read(data->regmap, ADM9240_REG_VID_FAN_DIV, &regval);
223	if (err < 0)
224		return err;
225	vid = regval & 0x0f;
226	err = regmap_read(data->regmap, ADM9240_REG_VID4, &regval);
227	if (err < 0)
228		return err;
229	vid |= (regval & 1) << 4;
230	return sprintf(buf, "%d\n", vid_from_reg(vid, data->vrm));
231}
232static DEVICE_ATTR_RO(cpu0_vid);
233
234static ssize_t aout_output_show(struct device *dev,
235				struct device_attribute *attr, char *buf)
236{
237	struct adm9240_data *data = dev_get_drvdata(dev);
238	unsigned int regval;
239	int err;
240
241	err = regmap_read(data->regmap, ADM9240_REG_ANALOG_OUT, &regval);
242	if (err)
243		return err;
244
245	return sprintf(buf, "%d\n", AOUT_FROM_REG(regval));
246}
247
248static ssize_t aout_output_store(struct device *dev,
249				 struct device_attribute *attr,
250				 const char *buf, size_t count)
251{
252	struct adm9240_data *data = dev_get_drvdata(dev);
253	long val;
254	int err;
255
256	err = kstrtol(buf, 10, &val);
257	if (err)
258		return err;
259
260	err = regmap_write(data->regmap, ADM9240_REG_ANALOG_OUT, AOUT_TO_REG(val));
261	return err < 0 ? err : count;
262}
263static DEVICE_ATTR_RW(aout_output);
264
265static struct attribute *adm9240_attrs[] = {
266	&dev_attr_aout_output.attr,
267	&dev_attr_cpu0_vid.attr,
268	NULL
269};
270
271ATTRIBUTE_GROUPS(adm9240);
272
273/*** sensor chip detect and driver install ***/
274
275/* Return 0 if detection is successful, -ENODEV otherwise */
276static int adm9240_detect(struct i2c_client *new_client,
277			  struct i2c_board_info *info)
278{
279	struct i2c_adapter *adapter = new_client->adapter;
280	const char *name = "";
281	int address = new_client->addr;
282	u8 man_id, die_rev;
283
284	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
285		return -ENODEV;
286
287	/* verify chip: reg address should match i2c address */
288	if (i2c_smbus_read_byte_data(new_client, ADM9240_REG_I2C_ADDR) != address)
289		return -ENODEV;
290
291	/* check known chip manufacturer */
292	man_id = i2c_smbus_read_byte_data(new_client, ADM9240_REG_MAN_ID);
293	if (man_id == 0x23)
294		name = "adm9240";
295	else if (man_id == 0xda)
296		name = "ds1780";
297	else if (man_id == 0x01)
298		name = "lm81";
299	else
300		return -ENODEV;
301
302	/* successful detect, print chip info */
303	die_rev = i2c_smbus_read_byte_data(new_client, ADM9240_REG_DIE_REV);
304	dev_info(&adapter->dev, "found %s revision %u\n",
305		 man_id == 0x23 ? "ADM9240" :
306		 man_id == 0xda ? "DS1780" : "LM81", die_rev);
307
308	strscpy(info->type, name, I2C_NAME_SIZE);
309
310	return 0;
311}
312
313static int adm9240_init_client(struct adm9240_data *data)
314{
315	unsigned int regval;
316	u8 conf, mode;
317	int err;
318
319	err = regmap_raw_read(data->regmap, ADM9240_REG_CONFIG, &conf, 1);
320	if (err < 0)
321		return err;
322	err = regmap_raw_read(data->regmap, ADM9240_REG_TEMP_CONF, &mode, 1);
323	if (err < 0)
324		return err;
325	mode &= 3;
326
327	data->vrm = vid_which_vrm(); /* need this to report vid as mV */
328
329	dev_info(data->dev, "Using VRM: %d.%d\n", data->vrm / 10,
330		 data->vrm % 10);
331
332	if (conf & 1) { /* measurement cycle running: report state */
333
334		dev_info(data->dev, "status: config 0x%02x mode %u\n",
335			 conf, mode);
336
337	} else { /* cold start: open limits before starting chip */
338		int i;
339
340		for (i = 0; i < 6; i++) {
341			err = regmap_write(data->regmap,
342					   ADM9240_REG_IN_MIN(i), 0);
343			if (err < 0)
344				return err;
345			err = regmap_write(data->regmap,
346					   ADM9240_REG_IN_MAX(i), 255);
347			if (err < 0)
348				return err;
349		}
350		for (i = 0; i < 2; i++) {
351			err = regmap_write(data->regmap,
352					   ADM9240_REG_FAN_MIN(i), 255);
353			if (err < 0)
354				return err;
355		}
356		for (i = 0; i < 2; i++) {
357			err = regmap_write(data->regmap,
358					   ADM9240_REG_TEMP_MAX(i), 127);
359			if (err < 0)
360				return err;
361		}
362
363		/* start measurement cycle */
364		err = regmap_write(data->regmap, ADM9240_REG_CONFIG, 1);
365		if (err < 0)
366			return err;
367
368		dev_info(data->dev,
369			 "cold start: config was 0x%02x mode %u\n", conf, mode);
370	}
371
372	/* read fan divs */
373	err = regmap_read(data->regmap, ADM9240_REG_VID_FAN_DIV, &regval);
374	if (err < 0)
375		return err;
376	data->fan_div[0] = (regval >> 4) & 3;
377	data->fan_div[1] = (regval >> 6) & 3;
378	return 0;
379}
380
381static int adm9240_chip_read(struct device *dev, u32 attr, long *val)
382{
383	struct adm9240_data *data = dev_get_drvdata(dev);
384	u8 regs[2];
385	int err;
386
387	switch (attr) {
388	case hwmon_chip_alarms:
389		err = regmap_bulk_read(data->regmap, ADM9240_REG_INT(0), &regs, 2);
390		if (err < 0)
391			return err;
392		*val = regs[0] | regs[1] << 8;
393		break;
394	default:
395		return -EOPNOTSUPP;
396	}
397	return 0;
398}
399
400static int adm9240_intrusion_read(struct device *dev, u32 attr, long *val)
401{
402	struct adm9240_data *data = dev_get_drvdata(dev);
403	unsigned int regval;
404	int err;
405
406	switch (attr) {
407	case hwmon_intrusion_alarm:
408		err = regmap_read(data->regmap, ADM9240_REG_INT(1), &regval);
409		if (err < 0)
410			return err;
411		*val = !!(regval & BIT(4));
412		break;
413	default:
414		return -EOPNOTSUPP;
415	}
416	return 0;
417}
418
419static int adm9240_intrusion_write(struct device *dev, u32 attr, long val)
420{
421	struct adm9240_data *data = dev_get_drvdata(dev);
422	int err;
423
424	switch (attr) {
425	case hwmon_intrusion_alarm:
426		if (val)
427			return -EINVAL;
428		err = regmap_write(data->regmap, ADM9240_REG_CHASSIS_CLEAR, 0x80);
429		if (err < 0)
430			return err;
431		dev_dbg(data->dev, "chassis intrusion latch cleared\n");
432		break;
433	default:
434		return -EOPNOTSUPP;
435	}
436	return 0;
437}
438
439static int adm9240_in_read(struct device *dev, u32 attr, int channel, long *val)
440{
441	struct adm9240_data *data = dev_get_drvdata(dev);
442	unsigned int regval;
443	int reg;
444	int err;
445
446	switch (attr) {
447	case hwmon_in_input:
448		reg = ADM9240_REG_IN(channel);
449		break;
450	case hwmon_in_min:
451		reg = ADM9240_REG_IN_MIN(channel);
452		break;
453	case hwmon_in_max:
454		reg = ADM9240_REG_IN_MAX(channel);
455		break;
456	case hwmon_in_alarm:
457		if (channel < 4) {
458			reg = ADM9240_REG_INT(0);
459		} else {
460			reg = ADM9240_REG_INT(1);
461			channel -= 4;
462		}
463		err = regmap_read(data->regmap, reg, &regval);
464		if (err < 0)
465			return err;
466		*val = !!(regval & BIT(channel));
467		return 0;
468	default:
469		return -EOPNOTSUPP;
470	}
471	err = regmap_read(data->regmap, reg, &regval);
472	if (err < 0)
473		return err;
474	*val = IN_FROM_REG(regval, channel);
475	return 0;
476}
477
478static int adm9240_in_write(struct device *dev, u32 attr, int channel, long val)
479{
480	struct adm9240_data *data = dev_get_drvdata(dev);
481	int reg;
482
483	switch (attr) {
484	case hwmon_in_min:
485		reg = ADM9240_REG_IN_MIN(channel);
486		break;
487	case hwmon_in_max:
488		reg = ADM9240_REG_IN_MAX(channel);
489		break;
490	default:
491		return -EOPNOTSUPP;
492	}
493	return regmap_write(data->regmap, reg, IN_TO_REG(val, channel));
494}
495
496static int adm9240_fan_read(struct device *dev, u32 attr, int channel, long *val)
497{
498	struct adm9240_data *data = dev_get_drvdata(dev);
499	unsigned int regval;
500	int err;
501
502	switch (attr) {
503	case hwmon_fan_input:
504		mutex_lock(&data->update_lock);
505		err = regmap_read(data->regmap, ADM9240_REG_FAN(channel), &regval);
506		if (err < 0) {
507			mutex_unlock(&data->update_lock);
508			return err;
509		}
510		if (regval == 255 && data->fan_div[channel] < 3) {
511			/* adjust fan clock divider on overflow */
512			err = adm9240_write_fan_div(data, channel,
513						    ++data->fan_div[channel]);
514			if (err) {
515				mutex_unlock(&data->update_lock);
516				return err;
517			}
518		}
519		*val = FAN_FROM_REG(regval, BIT(data->fan_div[channel]));
520		mutex_unlock(&data->update_lock);
521		break;
522	case hwmon_fan_div:
523		*val = BIT(data->fan_div[channel]);
524		break;
525	case hwmon_fan_min:
526		err = regmap_read(data->regmap, ADM9240_REG_FAN_MIN(channel), &regval);
527		if (err < 0)
528			return err;
529		*val = FAN_FROM_REG(regval, BIT(data->fan_div[channel]));
530		break;
531	case hwmon_fan_alarm:
532		err = regmap_read(data->regmap, ADM9240_REG_INT(0), &regval);
533		if (err < 0)
534			return err;
535		*val = !!(regval & BIT(channel + 6));
536		break;
537	default:
538		return -EOPNOTSUPP;
539	}
540	return 0;
541}
542
543static int adm9240_fan_write(struct device *dev, u32 attr, int channel, long val)
544{
545	struct adm9240_data *data = dev_get_drvdata(dev);
546	int err;
547
548	switch (attr) {
549	case hwmon_fan_min:
550		err = adm9240_fan_min_write(data, channel, val);
551		if (err < 0)
552			return err;
553		break;
554	default:
555		return -EOPNOTSUPP;
556	}
557	return 0;
558}
559
560static int adm9240_temp_read(struct device *dev, u32 attr, int channel, long *val)
561{
562	struct adm9240_data *data = dev_get_drvdata(dev);
563	unsigned int regval;
564	int err, temp;
565
566	switch (attr) {
567	case hwmon_temp_input:
568		err = regmap_read(data->regmap, ADM9240_REG_TEMP, &regval);
569		if (err < 0)
570			return err;
571		temp = regval << 1;
572		err = regmap_read(data->regmap, ADM9240_REG_TEMP_CONF, &regval);
573		if (err < 0)
574			return err;
575		temp |= regval >> 7;
576		*val = sign_extend32(temp, 8) * 500;
577		break;
578	case hwmon_temp_max:
579		err = regmap_read(data->regmap, ADM9240_REG_TEMP_MAX(0), &regval);
580		if (err < 0)
581			return err;
582		*val = (s8)regval * 1000;
583		break;
584	case hwmon_temp_max_hyst:
585		err = regmap_read(data->regmap, ADM9240_REG_TEMP_MAX(1), &regval);
586		if (err < 0)
587			return err;
588		*val = (s8)regval * 1000;
589		break;
590	case hwmon_temp_alarm:
591		err = regmap_read(data->regmap, ADM9240_REG_INT(0), &regval);
592		if (err < 0)
593			return err;
594		*val = !!(regval & BIT(4));
595		break;
596	default:
597		return -EOPNOTSUPP;
598	}
599	return 0;
600}
601
602static int adm9240_temp_write(struct device *dev, u32 attr, int channel, long val)
603{
604	struct adm9240_data *data = dev_get_drvdata(dev);
605	int reg;
606
607	switch (attr) {
608	case hwmon_temp_max:
609		reg = ADM9240_REG_TEMP_MAX(0);
610		break;
611	case hwmon_temp_max_hyst:
612		reg = ADM9240_REG_TEMP_MAX(1);
613		break;
614	default:
615		return -EOPNOTSUPP;
616	}
617	return regmap_write(data->regmap, reg, TEMP_TO_REG(val));
618}
619
620static int adm9240_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
621			int channel, long *val)
622{
623	switch (type) {
624	case hwmon_chip:
625		return adm9240_chip_read(dev, attr, val);
626	case hwmon_intrusion:
627		return adm9240_intrusion_read(dev, attr, val);
628	case hwmon_in:
629		return adm9240_in_read(dev, attr, channel, val);
630	case hwmon_fan:
631		return adm9240_fan_read(dev, attr, channel, val);
632	case hwmon_temp:
633		return adm9240_temp_read(dev, attr, channel, val);
634	default:
635		return -EOPNOTSUPP;
636	}
637}
638
639static int adm9240_write(struct device *dev, enum hwmon_sensor_types type, u32 attr,
640			 int channel, long val)
641{
642	switch (type) {
643	case hwmon_intrusion:
644		return adm9240_intrusion_write(dev, attr, val);
645	case hwmon_in:
646		return adm9240_in_write(dev, attr, channel, val);
647	case hwmon_fan:
648		return adm9240_fan_write(dev, attr, channel, val);
649	case hwmon_temp:
650		return adm9240_temp_write(dev, attr, channel, val);
651	default:
652		return -EOPNOTSUPP;
653	}
654}
655
656static umode_t adm9240_is_visible(const void *_data, enum hwmon_sensor_types type,
657				  u32 attr, int channel)
658{
659	umode_t mode = 0;
660
661	switch (type) {
662	case hwmon_chip:
663		switch (attr) {
664		case hwmon_chip_alarms:
665			mode = 0444;
666			break;
667		default:
668			break;
669		}
670		break;
671	case hwmon_intrusion:
672		switch (attr) {
673		case hwmon_intrusion_alarm:
674			mode = 0644;
675			break;
676		default:
677			break;
678		}
679		break;
680	case hwmon_temp:
681		switch (attr) {
682		case hwmon_temp:
683		case hwmon_temp_alarm:
684			mode = 0444;
685			break;
686		case hwmon_temp_max:
687		case hwmon_temp_max_hyst:
688			mode = 0644;
689			break;
690		default:
691			break;
692		}
693		break;
694	case hwmon_fan:
695		switch (attr) {
696		case hwmon_fan_input:
697		case hwmon_fan_div:
698		case hwmon_fan_alarm:
699			mode = 0444;
700			break;
701		case hwmon_fan_min:
702			mode = 0644;
703			break;
704		default:
705			break;
706		}
707		break;
708	case hwmon_in:
709		switch (attr) {
710		case hwmon_in_input:
711		case hwmon_in_alarm:
712			mode = 0444;
713			break;
714		case hwmon_in_min:
715		case hwmon_in_max:
716			mode = 0644;
717			break;
718		default:
719			break;
720		}
721		break;
722	default:
723		break;
724	}
725	return mode;
726}
727
728static const struct hwmon_ops adm9240_hwmon_ops = {
729	.is_visible = adm9240_is_visible,
730	.read = adm9240_read,
731	.write = adm9240_write,
732};
733
734static const struct hwmon_channel_info *adm9240_info[] = {
735	HWMON_CHANNEL_INFO(chip, HWMON_C_ALARMS),
736	HWMON_CHANNEL_INFO(intrusion, HWMON_INTRUSION_ALARM),
737	HWMON_CHANNEL_INFO(temp,
738			   HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST | HWMON_T_ALARM),
739	HWMON_CHANNEL_INFO(in,
740			   HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
741			   HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
742			   HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
743			   HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
744			   HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
745			   HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM),
746	HWMON_CHANNEL_INFO(fan,
747			   HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_DIV | HWMON_F_ALARM,
748			   HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_DIV | HWMON_F_ALARM),
749	NULL
750};
751
752static const struct hwmon_chip_info adm9240_chip_info = {
753	.ops = &adm9240_hwmon_ops,
754	.info = adm9240_info,
755};
756
757static bool adm9240_volatile_reg(struct device *dev, unsigned int reg)
758{
759	switch (reg) {
760	case ADM9240_REG_IN(0) ... ADM9240_REG_IN(5):
761	case ADM9240_REG_FAN(0) ... ADM9240_REG_FAN(1):
762	case ADM9240_REG_INT(0) ... ADM9240_REG_INT(1):
763	case ADM9240_REG_TEMP:
764	case ADM9240_REG_TEMP_CONF:
765	case ADM9240_REG_VID_FAN_DIV:
766	case ADM9240_REG_VID4:
767	case ADM9240_REG_ANALOG_OUT:
768		return true;
769	default:
770		return false;
771	}
772}
773
774static const struct regmap_config adm9240_regmap_config = {
775	.reg_bits = 8,
776	.val_bits = 8,
777	.use_single_read = true,
778	.use_single_write = true,
779	.volatile_reg = adm9240_volatile_reg,
780};
781
782static int adm9240_probe(struct i2c_client *client)
783{
784	struct device *dev = &client->dev;
785	struct device *hwmon_dev;
786	struct adm9240_data *data;
787	int err;
788
789	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
790	if (!data)
791		return -ENOMEM;
792
793	data->dev = dev;
794	mutex_init(&data->update_lock);
795	data->regmap = devm_regmap_init_i2c(client, &adm9240_regmap_config);
796	if (IS_ERR(data->regmap))
797		return PTR_ERR(data->regmap);
798
799	err = adm9240_init_client(data);
800	if (err < 0)
801		return err;
802
803	hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data,
804							 &adm9240_chip_info,
805							 adm9240_groups);
806	return PTR_ERR_OR_ZERO(hwmon_dev);
807}
808
809static const struct i2c_device_id adm9240_id[] = {
810	{ "adm9240", adm9240 },
811	{ "ds1780", ds1780 },
812	{ "lm81", lm81 },
813	{ }
814};
815MODULE_DEVICE_TABLE(i2c, adm9240_id);
816
817static struct i2c_driver adm9240_driver = {
818	.class		= I2C_CLASS_HWMON,
819	.driver = {
820		.name	= "adm9240",
821	},
822	.probe_new	= adm9240_probe,
823	.id_table	= adm9240_id,
824	.detect		= adm9240_detect,
825	.address_list	= normal_i2c,
826};
827
828module_i2c_driver(adm9240_driver);
829
830MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, "
831		"Grant Coady <gcoady.lk@gmail.com> and others");
832MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver");
833MODULE_LICENSE("GPL");