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/init.h>
 32#include <linux/module.h>
 33#include <linux/slab.h>
 34#include <linux/i2c.h>
 35#include <linux/hwmon-sysfs.h>
 36#include <linux/hwmon.h>
 37#include <linux/hwmon-vid.h>
 38#include <linux/err.h>
 39#include <linux/mutex.h>
 40#include <linux/jiffies.h>
 41
 42/* Addresses to scan */
 43static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
 44					I2C_CLIENT_END };
 45
 46enum chips { adm9240, ds1780, lm81 };
 47
 48/* ADM9240 registers */
 49#define ADM9240_REG_MAN_ID		0x3e
 50#define ADM9240_REG_DIE_REV		0x3f
 51#define ADM9240_REG_CONFIG		0x40
 52
 53#define ADM9240_REG_IN(nr)		(0x20 + (nr))   /* 0..5 */
 54#define ADM9240_REG_IN_MAX(nr)		(0x2b + (nr) * 2)
 55#define ADM9240_REG_IN_MIN(nr)		(0x2c + (nr) * 2)
 56#define ADM9240_REG_FAN(nr)		(0x28 + (nr))   /* 0..1 */
 57#define ADM9240_REG_FAN_MIN(nr)		(0x3b + (nr))
 58#define ADM9240_REG_INT(nr)		(0x41 + (nr))
 59#define ADM9240_REG_INT_MASK(nr)	(0x43 + (nr))
 60#define ADM9240_REG_TEMP		0x27
 61#define ADM9240_REG_TEMP_MAX(nr)	(0x39 + (nr)) /* 0, 1 = high, hyst */
 62#define ADM9240_REG_ANALOG_OUT		0x19
 63#define ADM9240_REG_CHASSIS_CLEAR	0x46
 64#define ADM9240_REG_VID_FAN_DIV		0x47
 65#define ADM9240_REG_I2C_ADDR		0x48
 66#define ADM9240_REG_VID4		0x49
 67#define ADM9240_REG_TEMP_CONF		0x4b
 68
 69/* generalised scaling with integer rounding */
 70static inline int SCALE(long val, int mul, int div)
 71{
 72	if (val < 0)
 73		return (val * mul - div / 2) / div;
 74	else
 75		return (val * mul + div / 2) / div;
 76}
 77
 78/* adm9240 internally scales voltage measurements */
 79static const u16 nom_mv[] = { 2500, 2700, 3300, 5000, 12000, 2700 };
 80
 81static inline unsigned int IN_FROM_REG(u8 reg, int n)
 82{
 83	return SCALE(reg, nom_mv[n], 192);
 84}
 85
 86static inline u8 IN_TO_REG(unsigned long val, int n)
 87{
 88	val = clamp_val(val, 0, nom_mv[n] * 255 / 192);
 89	return SCALE(val, 192, nom_mv[n]);
 90}
 91
 92/* temperature range: -40..125, 127 disables temperature alarm */
 93static inline s8 TEMP_TO_REG(long val)
 94{
 95	val = clamp_val(val, -40000, 127000);
 96	return SCALE(val, 1, 1000);
 97}
 98
 99/* two fans, each with low fan speed limit */
100static inline unsigned int FAN_FROM_REG(u8 reg, u8 div)
101{
102	if (!reg) /* error */
103		return -1;
104
105	if (reg == 255)
106		return 0;
107
108	return SCALE(1350000, 1, reg * div);
109}
110
111/* analog out 0..1250mV */
112static inline u8 AOUT_TO_REG(unsigned long val)
113{
114	val = clamp_val(val, 0, 1250);
115	return SCALE(val, 255, 1250);
116}
117
118static inline unsigned int AOUT_FROM_REG(u8 reg)
119{
120	return SCALE(reg, 1250, 255);
121}
122
123/* per client data */
124struct adm9240_data {
125	struct i2c_client *client;
126	struct mutex update_lock;
127	char valid;
128	unsigned long last_updated_measure;
129	unsigned long last_updated_config;
130
131	u8 in[6];		/* ro	in0_input */
132	u8 in_max[6];		/* rw	in0_max */
133	u8 in_min[6];		/* rw	in0_min */
134	u8 fan[2];		/* ro	fan1_input */
135	u8 fan_min[2];		/* rw	fan1_min */
136	u8 fan_div[2];		/* rw	fan1_div, read-only accessor */
137	s16 temp;		/* ro	temp1_input, 9-bit sign-extended */
138	s8 temp_max[2];		/* rw	0 -> temp_max, 1 -> temp_max_hyst */
139	u16 alarms;		/* ro	alarms */
140	u8 aout;		/* rw	aout_output */
141	u8 vid;			/* ro	vid */
142	u8 vrm;			/* --	vrm set on startup, no accessor */
143};
144
145/* write new fan div, callers must hold data->update_lock */
146static void adm9240_write_fan_div(struct i2c_client *client, int nr,
147		u8 fan_div)
148{
149	u8 reg, old, shift = (nr + 2) * 2;
150
151	reg = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV);
152	old = (reg >> shift) & 3;
153	reg &= ~(3 << shift);
154	reg |= (fan_div << shift);
155	i2c_smbus_write_byte_data(client, ADM9240_REG_VID_FAN_DIV, reg);
156	dev_dbg(&client->dev,
157		"fan%d clock divider changed from %u to %u\n",
158		nr + 1, 1 << old, 1 << fan_div);
159}
160
161static struct adm9240_data *adm9240_update_device(struct device *dev)
162{
163	struct adm9240_data *data = dev_get_drvdata(dev);
164	struct i2c_client *client = data->client;
165	int i;
166
167	mutex_lock(&data->update_lock);
168
169	/* minimum measurement cycle: 1.75 seconds */
170	if (time_after(jiffies, data->last_updated_measure + (HZ * 7 / 4))
171			|| !data->valid) {
172
173		for (i = 0; i < 6; i++) { /* read voltages */
174			data->in[i] = i2c_smbus_read_byte_data(client,
175					ADM9240_REG_IN(i));
176		}
177		data->alarms = i2c_smbus_read_byte_data(client,
178					ADM9240_REG_INT(0)) |
179					i2c_smbus_read_byte_data(client,
180					ADM9240_REG_INT(1)) << 8;
181
182		/*
183		 * read temperature: assume temperature changes less than
184		 * 0.5'C per two measurement cycles thus ignore possible
185		 * but unlikely aliasing error on lsb reading. --Grant
186		 */
187		data->temp = (i2c_smbus_read_byte_data(client,
188					ADM9240_REG_TEMP) << 8) |
189					i2c_smbus_read_byte_data(client,
190					ADM9240_REG_TEMP_CONF);
191
192		for (i = 0; i < 2; i++) { /* read fans */
193			data->fan[i] = i2c_smbus_read_byte_data(client,
194					ADM9240_REG_FAN(i));
195
196			/* adjust fan clock divider on overflow */
197			if (data->valid && data->fan[i] == 255 &&
198					data->fan_div[i] < 3) {
199
200				adm9240_write_fan_div(client, i,
201						++data->fan_div[i]);
202
203				/* adjust fan_min if active, but not to 0 */
204				if (data->fan_min[i] < 255 &&
205						data->fan_min[i] >= 2)
206					data->fan_min[i] /= 2;
207			}
208		}
209		data->last_updated_measure = jiffies;
210	}
211
212	/* minimum config reading cycle: 300 seconds */
213	if (time_after(jiffies, data->last_updated_config + (HZ * 300))
214			|| !data->valid) {
215
216		for (i = 0; i < 6; i++) {
217			data->in_min[i] = i2c_smbus_read_byte_data(client,
218					ADM9240_REG_IN_MIN(i));
219			data->in_max[i] = i2c_smbus_read_byte_data(client,
220					ADM9240_REG_IN_MAX(i));
221		}
222		for (i = 0; i < 2; i++) {
223			data->fan_min[i] = i2c_smbus_read_byte_data(client,
224					ADM9240_REG_FAN_MIN(i));
225		}
226		data->temp_max[0] = i2c_smbus_read_byte_data(client,
227				ADM9240_REG_TEMP_MAX(0));
228		data->temp_max[1] = i2c_smbus_read_byte_data(client,
229				ADM9240_REG_TEMP_MAX(1));
230
231		/* read fan divs and 5-bit VID */
232		i = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV);
233		data->fan_div[0] = (i >> 4) & 3;
234		data->fan_div[1] = (i >> 6) & 3;
235		data->vid = i & 0x0f;
236		data->vid |= (i2c_smbus_read_byte_data(client,
237					ADM9240_REG_VID4) & 1) << 4;
238		/* read analog out */
239		data->aout = i2c_smbus_read_byte_data(client,
240				ADM9240_REG_ANALOG_OUT);
241
242		data->last_updated_config = jiffies;
243		data->valid = 1;
244	}
245	mutex_unlock(&data->update_lock);
246	return data;
247}
248
249/*** sysfs accessors ***/
250
251/* temperature */
252static ssize_t temp1_input_show(struct device *dev,
253				struct device_attribute *dummy, char *buf)
254{
255	struct adm9240_data *data = adm9240_update_device(dev);
256	return sprintf(buf, "%d\n", data->temp / 128 * 500); /* 9-bit value */
257}
258
259static ssize_t max_show(struct device *dev, struct device_attribute *devattr,
260			char *buf)
261{
262	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
263	struct adm9240_data *data = adm9240_update_device(dev);
264	return sprintf(buf, "%d\n", data->temp_max[attr->index] * 1000);
265}
266
267static ssize_t max_store(struct device *dev, struct device_attribute *devattr,
268			 const char *buf, size_t count)
269{
270	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
271	struct adm9240_data *data = dev_get_drvdata(dev);
272	struct i2c_client *client = data->client;
273	long val;
274	int err;
275
276	err = kstrtol(buf, 10, &val);
277	if (err)
278		return err;
279
280	mutex_lock(&data->update_lock);
281	data->temp_max[attr->index] = TEMP_TO_REG(val);
282	i2c_smbus_write_byte_data(client, ADM9240_REG_TEMP_MAX(attr->index),
283			data->temp_max[attr->index]);
284	mutex_unlock(&data->update_lock);
285	return count;
286}
287
288static DEVICE_ATTR_RO(temp1_input);
289static SENSOR_DEVICE_ATTR_RW(temp1_max, max, 0);
290static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, max, 1);
291
292/* voltage */
293static ssize_t in_show(struct device *dev, struct device_attribute *devattr,
294		       char *buf)
295{
296	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
297	struct adm9240_data *data = adm9240_update_device(dev);
298	return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index],
299				attr->index));
300}
301
302static ssize_t in_min_show(struct device *dev,
303			   struct device_attribute *devattr, char *buf)
304{
305	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
306	struct adm9240_data *data = adm9240_update_device(dev);
307	return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index],
308				attr->index));
309}
310
311static ssize_t in_max_show(struct device *dev,
312			   struct device_attribute *devattr, char *buf)
313{
314	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
315	struct adm9240_data *data = adm9240_update_device(dev);
316	return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index],
317				attr->index));
318}
319
320static ssize_t in_min_store(struct device *dev,
321			    struct device_attribute *devattr, const char *buf,
322			    size_t count)
323{
324	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
325	struct adm9240_data *data = dev_get_drvdata(dev);
326	struct i2c_client *client = data->client;
327	unsigned long val;
328	int err;
329
330	err = kstrtoul(buf, 10, &val);
331	if (err)
332		return err;
333
334	mutex_lock(&data->update_lock);
335	data->in_min[attr->index] = IN_TO_REG(val, attr->index);
336	i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MIN(attr->index),
337			data->in_min[attr->index]);
338	mutex_unlock(&data->update_lock);
339	return count;
340}
341
342static ssize_t in_max_store(struct device *dev,
343			    struct device_attribute *devattr, const char *buf,
344			    size_t count)
345{
346	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
347	struct adm9240_data *data = dev_get_drvdata(dev);
348	struct i2c_client *client = data->client;
349	unsigned long val;
350	int err;
351
352	err = kstrtoul(buf, 10, &val);
353	if (err)
354		return err;
355
356	mutex_lock(&data->update_lock);
357	data->in_max[attr->index] = IN_TO_REG(val, attr->index);
358	i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MAX(attr->index),
359			data->in_max[attr->index]);
360	mutex_unlock(&data->update_lock);
361	return count;
362}
363
364static SENSOR_DEVICE_ATTR_RO(in0_input, in, 0);
365static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0);
366static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0);
367static SENSOR_DEVICE_ATTR_RO(in1_input, in, 1);
368static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1);
369static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1);
370static SENSOR_DEVICE_ATTR_RO(in2_input, in, 2);
371static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2);
372static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2);
373static SENSOR_DEVICE_ATTR_RO(in3_input, in, 3);
374static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3);
375static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3);
376static SENSOR_DEVICE_ATTR_RO(in4_input, in, 4);
377static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4);
378static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4);
379static SENSOR_DEVICE_ATTR_RO(in5_input, in, 5);
380static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5);
381static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5);
382
383/* fans */
384static ssize_t fan_show(struct device *dev, struct device_attribute *devattr,
385			char *buf)
386{
387	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
388	struct adm9240_data *data = adm9240_update_device(dev);
389	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index],
390				1 << data->fan_div[attr->index]));
391}
392
393static ssize_t fan_min_show(struct device *dev,
394			    struct device_attribute *devattr, char *buf)
395{
396	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
397	struct adm9240_data *data = adm9240_update_device(dev);
398	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[attr->index],
399				1 << data->fan_div[attr->index]));
400}
401
402static ssize_t fan_div_show(struct device *dev,
403			    struct device_attribute *devattr, char *buf)
404{
405	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
406	struct adm9240_data *data = adm9240_update_device(dev);
407	return sprintf(buf, "%d\n", 1 << data->fan_div[attr->index]);
408}
409
410/*
411 * set fan speed low limit:
412 *
413 * - value is zero: disable fan speed low limit alarm
414 *
415 * - value is below fan speed measurement range: enable fan speed low
416 *   limit alarm to be asserted while fan speed too slow to measure
417 *
418 * - otherwise: select fan clock divider to suit fan speed low limit,
419 *   measurement code may adjust registers to ensure fan speed reading
420 */
421static ssize_t fan_min_store(struct device *dev,
422			     struct device_attribute *devattr,
423			     const char *buf, size_t count)
424{
425	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
426	struct adm9240_data *data = dev_get_drvdata(dev);
427	struct i2c_client *client = data->client;
428	int nr = attr->index;
429	u8 new_div;
430	unsigned long val;
431	int err;
432
433	err = kstrtoul(buf, 10, &val);
434	if (err)
435		return err;
436
437	mutex_lock(&data->update_lock);
438
439	if (!val) {
440		data->fan_min[nr] = 255;
441		new_div = data->fan_div[nr];
442
443		dev_dbg(&client->dev, "fan%u low limit set disabled\n",
444				nr + 1);
445
446	} else if (val < 1350000 / (8 * 254)) {
447		new_div = 3;
448		data->fan_min[nr] = 254;
449
450		dev_dbg(&client->dev, "fan%u low limit set minimum %u\n",
451				nr + 1, FAN_FROM_REG(254, 1 << new_div));
452
453	} else {
454		unsigned int new_min = 1350000 / val;
455
456		new_div = 0;
457		while (new_min > 192 && new_div < 3) {
458			new_div++;
459			new_min /= 2;
460		}
461		if (!new_min) /* keep > 0 */
462			new_min++;
463
464		data->fan_min[nr] = new_min;
465
466		dev_dbg(&client->dev, "fan%u low limit set fan speed %u\n",
467				nr + 1, FAN_FROM_REG(new_min, 1 << new_div));
468	}
469
470	if (new_div != data->fan_div[nr]) {
471		data->fan_div[nr] = new_div;
472		adm9240_write_fan_div(client, nr, new_div);
473	}
474	i2c_smbus_write_byte_data(client, ADM9240_REG_FAN_MIN(nr),
475			data->fan_min[nr]);
476
477	mutex_unlock(&data->update_lock);
478	return count;
479}
480
481static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);
482static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);
483static SENSOR_DEVICE_ATTR_RO(fan1_div, fan_div, 0);
484static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);
485static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
486static SENSOR_DEVICE_ATTR_RO(fan2_div, fan_div, 1);
487
488/* alarms */
489static ssize_t alarms_show(struct device *dev,
490		struct device_attribute *attr, char *buf)
491{
492	struct adm9240_data *data = adm9240_update_device(dev);
493	return sprintf(buf, "%u\n", data->alarms);
494}
495static DEVICE_ATTR_RO(alarms);
496
497static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
498			  char *buf)
499{
500	int bitnr = to_sensor_dev_attr(attr)->index;
501	struct adm9240_data *data = adm9240_update_device(dev);
502	return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
503}
504static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0);
505static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1);
506static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2);
507static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3);
508static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8);
509static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 9);
510static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4);
511static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6);
512static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7);
513
514/* vid */
515static ssize_t cpu0_vid_show(struct device *dev,
516			     struct device_attribute *attr, char *buf)
517{
518	struct adm9240_data *data = adm9240_update_device(dev);
519	return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
520}
521static DEVICE_ATTR_RO(cpu0_vid);
522
523/* analog output */
524static ssize_t aout_output_show(struct device *dev,
525				struct device_attribute *attr, char *buf)
526{
527	struct adm9240_data *data = adm9240_update_device(dev);
528	return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
529}
530
531static ssize_t aout_output_store(struct device *dev,
532				 struct device_attribute *attr,
533				 const char *buf, size_t count)
534{
535	struct adm9240_data *data = dev_get_drvdata(dev);
536	struct i2c_client *client = data->client;
537	long val;
538	int err;
539
540	err = kstrtol(buf, 10, &val);
541	if (err)
542		return err;
543
544	mutex_lock(&data->update_lock);
545	data->aout = AOUT_TO_REG(val);
546	i2c_smbus_write_byte_data(client, ADM9240_REG_ANALOG_OUT, data->aout);
547	mutex_unlock(&data->update_lock);
548	return count;
549}
550static DEVICE_ATTR_RW(aout_output);
551
552static ssize_t alarm_store(struct device *dev, struct device_attribute *attr,
553			   const char *buf, size_t count)
554{
555	struct adm9240_data *data = dev_get_drvdata(dev);
556	struct i2c_client *client = data->client;
557	unsigned long val;
558
559	if (kstrtoul(buf, 10, &val) || val != 0)
560		return -EINVAL;
561
562	mutex_lock(&data->update_lock);
563	i2c_smbus_write_byte_data(client, ADM9240_REG_CHASSIS_CLEAR, 0x80);
564	data->valid = 0;		/* Force cache refresh */
565	mutex_unlock(&data->update_lock);
566	dev_dbg(&client->dev, "chassis intrusion latch cleared\n");
567
568	return count;
569}
570static SENSOR_DEVICE_ATTR_RW(intrusion0_alarm, alarm, 12);
571
572static struct attribute *adm9240_attrs[] = {
573	&sensor_dev_attr_in0_input.dev_attr.attr,
574	&sensor_dev_attr_in0_min.dev_attr.attr,
575	&sensor_dev_attr_in0_max.dev_attr.attr,
576	&sensor_dev_attr_in0_alarm.dev_attr.attr,
577	&sensor_dev_attr_in1_input.dev_attr.attr,
578	&sensor_dev_attr_in1_min.dev_attr.attr,
579	&sensor_dev_attr_in1_max.dev_attr.attr,
580	&sensor_dev_attr_in1_alarm.dev_attr.attr,
581	&sensor_dev_attr_in2_input.dev_attr.attr,
582	&sensor_dev_attr_in2_min.dev_attr.attr,
583	&sensor_dev_attr_in2_max.dev_attr.attr,
584	&sensor_dev_attr_in2_alarm.dev_attr.attr,
585	&sensor_dev_attr_in3_input.dev_attr.attr,
586	&sensor_dev_attr_in3_min.dev_attr.attr,
587	&sensor_dev_attr_in3_max.dev_attr.attr,
588	&sensor_dev_attr_in3_alarm.dev_attr.attr,
589	&sensor_dev_attr_in4_input.dev_attr.attr,
590	&sensor_dev_attr_in4_min.dev_attr.attr,
591	&sensor_dev_attr_in4_max.dev_attr.attr,
592	&sensor_dev_attr_in4_alarm.dev_attr.attr,
593	&sensor_dev_attr_in5_input.dev_attr.attr,
594	&sensor_dev_attr_in5_min.dev_attr.attr,
595	&sensor_dev_attr_in5_max.dev_attr.attr,
596	&sensor_dev_attr_in5_alarm.dev_attr.attr,
597	&dev_attr_temp1_input.attr,
598	&sensor_dev_attr_temp1_max.dev_attr.attr,
599	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
600	&sensor_dev_attr_temp1_alarm.dev_attr.attr,
601	&sensor_dev_attr_fan1_input.dev_attr.attr,
602	&sensor_dev_attr_fan1_div.dev_attr.attr,
603	&sensor_dev_attr_fan1_min.dev_attr.attr,
604	&sensor_dev_attr_fan1_alarm.dev_attr.attr,
605	&sensor_dev_attr_fan2_input.dev_attr.attr,
606	&sensor_dev_attr_fan2_div.dev_attr.attr,
607	&sensor_dev_attr_fan2_min.dev_attr.attr,
608	&sensor_dev_attr_fan2_alarm.dev_attr.attr,
609	&dev_attr_alarms.attr,
610	&dev_attr_aout_output.attr,
611	&sensor_dev_attr_intrusion0_alarm.dev_attr.attr,
612	&dev_attr_cpu0_vid.attr,
613	NULL
614};
615
616ATTRIBUTE_GROUPS(adm9240);
617
618/*** sensor chip detect and driver install ***/
619
620/* Return 0 if detection is successful, -ENODEV otherwise */
621static int adm9240_detect(struct i2c_client *new_client,
622			  struct i2c_board_info *info)
623{
624	struct i2c_adapter *adapter = new_client->adapter;
625	const char *name = "";
626	int address = new_client->addr;
627	u8 man_id, die_rev;
628
629	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
630		return -ENODEV;
631
632	/* verify chip: reg address should match i2c address */
633	if (i2c_smbus_read_byte_data(new_client, ADM9240_REG_I2C_ADDR)
634			!= address) {
635		dev_err(&adapter->dev, "detect fail: address match, 0x%02x\n",
636			address);
637		return -ENODEV;
638	}
639
640	/* check known chip manufacturer */
641	man_id = i2c_smbus_read_byte_data(new_client, ADM9240_REG_MAN_ID);
642	if (man_id == 0x23) {
643		name = "adm9240";
644	} else if (man_id == 0xda) {
645		name = "ds1780";
646	} else if (man_id == 0x01) {
647		name = "lm81";
648	} else {
649		dev_err(&adapter->dev, "detect fail: unknown manuf, 0x%02x\n",
650			man_id);
651		return -ENODEV;
652	}
653
654	/* successful detect, print chip info */
655	die_rev = i2c_smbus_read_byte_data(new_client, ADM9240_REG_DIE_REV);
656	dev_info(&adapter->dev, "found %s revision %u\n",
657		 man_id == 0x23 ? "ADM9240" :
658		 man_id == 0xda ? "DS1780" : "LM81", die_rev);
659
660	strlcpy(info->type, name, I2C_NAME_SIZE);
661
662	return 0;
663}
664
665static void adm9240_init_client(struct i2c_client *client)
666{
667	struct adm9240_data *data = i2c_get_clientdata(client);
668	u8 conf = i2c_smbus_read_byte_data(client, ADM9240_REG_CONFIG);
669	u8 mode = i2c_smbus_read_byte_data(client, ADM9240_REG_TEMP_CONF) & 3;
670
671	data->vrm = vid_which_vrm(); /* need this to report vid as mV */
672
673	dev_info(&client->dev, "Using VRM: %d.%d\n", data->vrm / 10,
674			data->vrm % 10);
675
676	if (conf & 1) { /* measurement cycle running: report state */
677
678		dev_info(&client->dev, "status: config 0x%02x mode %u\n",
679				conf, mode);
680
681	} else { /* cold start: open limits before starting chip */
682		int i;
683
684		for (i = 0; i < 6; i++) {
685			i2c_smbus_write_byte_data(client,
686					ADM9240_REG_IN_MIN(i), 0);
687			i2c_smbus_write_byte_data(client,
688					ADM9240_REG_IN_MAX(i), 255);
689		}
690		i2c_smbus_write_byte_data(client,
691				ADM9240_REG_FAN_MIN(0), 255);
692		i2c_smbus_write_byte_data(client,
693				ADM9240_REG_FAN_MIN(1), 255);
694		i2c_smbus_write_byte_data(client,
695				ADM9240_REG_TEMP_MAX(0), 127);
696		i2c_smbus_write_byte_data(client,
697				ADM9240_REG_TEMP_MAX(1), 127);
698
699		/* start measurement cycle */
700		i2c_smbus_write_byte_data(client, ADM9240_REG_CONFIG, 1);
701
702		dev_info(&client->dev,
703			 "cold start: config was 0x%02x mode %u\n", conf, mode);
704	}
705}
706
707static int adm9240_probe(struct i2c_client *new_client,
708			 const struct i2c_device_id *id)
709{
710	struct device *dev = &new_client->dev;
711	struct device *hwmon_dev;
712	struct adm9240_data *data;
713
714	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
715	if (!data)
716		return -ENOMEM;
717
718	i2c_set_clientdata(new_client, data);
719	data->client = new_client;
720	mutex_init(&data->update_lock);
721
722	adm9240_init_client(new_client);
723
724	hwmon_dev = devm_hwmon_device_register_with_groups(dev,
725							   new_client->name,
726							   data,
727							   adm9240_groups);
728	return PTR_ERR_OR_ZERO(hwmon_dev);
729}
730
731static const struct i2c_device_id adm9240_id[] = {
732	{ "adm9240", adm9240 },
733	{ "ds1780", ds1780 },
734	{ "lm81", lm81 },
735	{ }
736};
737MODULE_DEVICE_TABLE(i2c, adm9240_id);
738
739static struct i2c_driver adm9240_driver = {
740	.class		= I2C_CLASS_HWMON,
741	.driver = {
742		.name	= "adm9240",
743	},
744	.probe		= adm9240_probe,
745	.id_table	= adm9240_id,
746	.detect		= adm9240_detect,
747	.address_list	= normal_i2c,
748};
749
750module_i2c_driver(adm9240_driver);
751
752MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, "
753		"Grant Coady <gcoady.lk@gmail.com> and others");
754MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver");
755MODULE_LICENSE("GPL");