1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Copyright (c) 2012 Guenter Roeck <linux@roeck-us.net>
  4 *
  5 * based on max1668.c
  6 * Copyright (c) 2011 David George <david.george@ska.ac.za>
  7 */
  8
  9#include <linux/module.h>
 10#include <linux/init.h>
 11#include <linux/slab.h>
 12#include <linux/jiffies.h>
 13#include <linux/i2c.h>
 14#include <linux/hwmon.h>
 15#include <linux/hwmon-sysfs.h>
 16#include <linux/err.h>
 17#include <linux/mutex.h>
 18#include <linux/of_device.h>
 19#include <linux/of.h>
 20
 21#include <linux/platform_data/max6697.h>
 22
 23enum chips { max6581, max6602, max6622, max6636, max6689, max6693, max6694,
 24	     max6697, max6698, max6699 };
 25
 26/* Report local sensor as temp1 */
 27
 28static const u8 MAX6697_REG_TEMP[] = {
 29			0x07, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x08 };
 30static const u8 MAX6697_REG_TEMP_EXT[] = {
 31			0x57, 0x09, 0x52, 0x53, 0x54, 0x55, 0x56, 0 };
 32static const u8 MAX6697_REG_MAX[] = {
 33			0x17, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x18 };
 34static const u8 MAX6697_REG_CRIT[] = {
 35			0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27 };
 36
 37/*
 38 * Map device tree / platform data register bit map to chip bit map.
 39 * Applies to alert register and over-temperature register.
 40 */
 41#define MAX6697_ALERT_MAP_BITS(reg)	((((reg) & 0x7e) >> 1) | \
 42				 (((reg) & 0x01) << 6) | ((reg) & 0x80))
 43#define MAX6697_OVERT_MAP_BITS(reg) (((reg) >> 1) | (((reg) & 0x01) << 7))
 44
 45#define MAX6697_REG_STAT(n)		(0x44 + (n))
 46
 47#define MAX6697_REG_CONFIG		0x41
 48#define MAX6581_CONF_EXTENDED		(1 << 1)
 49#define MAX6693_CONF_BETA		(1 << 2)
 50#define MAX6697_CONF_RESISTANCE		(1 << 3)
 51#define MAX6697_CONF_TIMEOUT		(1 << 5)
 52#define MAX6697_REG_ALERT_MASK		0x42
 53#define MAX6697_REG_OVERT_MASK		0x43
 54
 55#define MAX6581_REG_RESISTANCE		0x4a
 56#define MAX6581_REG_IDEALITY		0x4b
 57#define MAX6581_REG_IDEALITY_SELECT	0x4c
 58#define MAX6581_REG_OFFSET		0x4d
 59#define MAX6581_REG_OFFSET_SELECT	0x4e
 60#define MAX6581_OFFSET_MIN		-31750
 61#define MAX6581_OFFSET_MAX		31750
 62
 63#define MAX6697_CONV_TIME		156	/* ms per channel, worst case */
 64
 65struct max6697_chip_data {
 66	int channels;
 67	u32 have_ext;
 68	u32 have_crit;
 69	u32 have_fault;
 70	u8 valid_conf;
 71	const u8 *alarm_map;
 72};
 73
 74struct max6697_data {
 75	struct i2c_client *client;
 76
 77	enum chips type;
 78	const struct max6697_chip_data *chip;
 79
 80	int update_interval;	/* in milli-seconds */
 81	int temp_offset;	/* in degrees C */
 82
 83	struct mutex update_lock;
 84	unsigned long last_updated;	/* In jiffies */
 85	bool valid;		/* true if following fields are valid */
 86
 87	/* 1x local and up to 7x remote */
 88	u8 temp[8][4];		/* [nr][0]=temp [1]=ext [2]=max [3]=crit */
 89#define MAX6697_TEMP_INPUT	0
 90#define MAX6697_TEMP_EXT	1
 91#define MAX6697_TEMP_MAX	2
 92#define MAX6697_TEMP_CRIT	3
 93	u32 alarms;
 94};
 95
 96/* Diode fault status bits on MAX6581 are right shifted by one bit */
 97static const u8 max6581_alarm_map[] = {
 98	 0, 0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15,
 99	 16, 17, 18, 19, 20, 21, 22, 23 };
100
101static const struct max6697_chip_data max6697_chip_data[] = {
102	[max6581] = {
103		.channels = 8,
104		.have_crit = 0xff,
105		.have_ext = 0x7f,
106		.have_fault = 0xfe,
107		.valid_conf = MAX6581_CONF_EXTENDED | MAX6697_CONF_TIMEOUT,
108		.alarm_map = max6581_alarm_map,
109	},
110	[max6602] = {
111		.channels = 5,
112		.have_crit = 0x12,
113		.have_ext = 0x02,
114		.have_fault = 0x1e,
115		.valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
116	},
117	[max6622] = {
118		.channels = 5,
119		.have_crit = 0x12,
120		.have_ext = 0x02,
121		.have_fault = 0x1e,
122		.valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
123	},
124	[max6636] = {
125		.channels = 7,
126		.have_crit = 0x72,
127		.have_ext = 0x02,
128		.have_fault = 0x7e,
129		.valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
130	},
131	[max6689] = {
132		.channels = 7,
133		.have_crit = 0x72,
134		.have_ext = 0x02,
135		.have_fault = 0x7e,
136		.valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
137	},
138	[max6693] = {
139		.channels = 7,
140		.have_crit = 0x72,
141		.have_ext = 0x02,
142		.have_fault = 0x7e,
143		.valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
144		  MAX6697_CONF_TIMEOUT,
145	},
146	[max6694] = {
147		.channels = 5,
148		.have_crit = 0x12,
149		.have_ext = 0x02,
150		.have_fault = 0x1e,
151		.valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
152		  MAX6697_CONF_TIMEOUT,
153	},
154	[max6697] = {
155		.channels = 7,
156		.have_crit = 0x72,
157		.have_ext = 0x02,
158		.have_fault = 0x7e,
159		.valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
160	},
161	[max6698] = {
162		.channels = 7,
163		.have_crit = 0x72,
164		.have_ext = 0x02,
165		.have_fault = 0x0e,
166		.valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
167	},
168	[max6699] = {
169		.channels = 5,
170		.have_crit = 0x12,
171		.have_ext = 0x02,
172		.have_fault = 0x1e,
173		.valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
174	},
175};
176
177static inline int max6581_offset_to_millic(int val)
178{
179	return sign_extend32(val, 7) * 250;
180}
181
182static struct max6697_data *max6697_update_device(struct device *dev)
183{
184	struct max6697_data *data = dev_get_drvdata(dev);
185	struct i2c_client *client = data->client;
186	struct max6697_data *ret = data;
187	int val;
188	int i;
189	u32 alarms;
190
191	mutex_lock(&data->update_lock);
192
193	if (data->valid &&
194	    !time_after(jiffies, data->last_updated
195			+ msecs_to_jiffies(data->update_interval)))
196		goto abort;
197
198	for (i = 0; i < data->chip->channels; i++) {
199		if (data->chip->have_ext & (1 << i)) {
200			val = i2c_smbus_read_byte_data(client,
201						       MAX6697_REG_TEMP_EXT[i]);
202			if (unlikely(val < 0)) {
203				ret = ERR_PTR(val);
204				goto abort;
205			}
206			data->temp[i][MAX6697_TEMP_EXT] = val;
207		}
208
209		val = i2c_smbus_read_byte_data(client, MAX6697_REG_TEMP[i]);
210		if (unlikely(val < 0)) {
211			ret = ERR_PTR(val);
212			goto abort;
213		}
214		data->temp[i][MAX6697_TEMP_INPUT] = val;
215
216		val = i2c_smbus_read_byte_data(client, MAX6697_REG_MAX[i]);
217		if (unlikely(val < 0)) {
218			ret = ERR_PTR(val);
219			goto abort;
220		}
221		data->temp[i][MAX6697_TEMP_MAX] = val;
222
223		if (data->chip->have_crit & (1 << i)) {
224			val = i2c_smbus_read_byte_data(client,
225						       MAX6697_REG_CRIT[i]);
226			if (unlikely(val < 0)) {
227				ret = ERR_PTR(val);
228				goto abort;
229			}
230			data->temp[i][MAX6697_TEMP_CRIT] = val;
231		}
232	}
233
234	alarms = 0;
235	for (i = 0; i < 3; i++) {
236		val = i2c_smbus_read_byte_data(client, MAX6697_REG_STAT(i));
237		if (unlikely(val < 0)) {
238			ret = ERR_PTR(val);
239			goto abort;
240		}
241		alarms = (alarms << 8) | val;
242	}
243	data->alarms = alarms;
244	data->last_updated = jiffies;
245	data->valid = true;
246abort:
247	mutex_unlock(&data->update_lock);
248
249	return ret;
250}
251
252static ssize_t temp_input_show(struct device *dev,
253			       struct device_attribute *devattr, char *buf)
254{
255	int index = to_sensor_dev_attr(devattr)->index;
256	struct max6697_data *data = max6697_update_device(dev);
257	int temp;
258
259	if (IS_ERR(data))
260		return PTR_ERR(data);
261
262	temp = (data->temp[index][MAX6697_TEMP_INPUT] - data->temp_offset) << 3;
263	temp |= data->temp[index][MAX6697_TEMP_EXT] >> 5;
264
265	return sprintf(buf, "%d\n", temp * 125);
266}
267
268static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
269			 char *buf)
270{
271	int nr = to_sensor_dev_attr_2(devattr)->nr;
272	int index = to_sensor_dev_attr_2(devattr)->index;
273	struct max6697_data *data = max6697_update_device(dev);
274	int temp;
275
276	if (IS_ERR(data))
277		return PTR_ERR(data);
278
279	temp = data->temp[nr][index];
280	temp -= data->temp_offset;
281
282	return sprintf(buf, "%d\n", temp * 1000);
283}
284
285static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
286			  char *buf)
287{
288	int index = to_sensor_dev_attr(attr)->index;
289	struct max6697_data *data = max6697_update_device(dev);
290
291	if (IS_ERR(data))
292		return PTR_ERR(data);
293
294	if (data->chip->alarm_map)
295		index = data->chip->alarm_map[index];
296
297	return sprintf(buf, "%u\n", (data->alarms >> index) & 0x1);
298}
299
300static ssize_t temp_store(struct device *dev,
301			  struct device_attribute *devattr, const char *buf,
302			  size_t count)
303{
304	int nr = to_sensor_dev_attr_2(devattr)->nr;
305	int index = to_sensor_dev_attr_2(devattr)->index;
306	struct max6697_data *data = dev_get_drvdata(dev);
307	long temp;
308	int ret;
309
310	ret = kstrtol(buf, 10, &temp);
311	if (ret < 0)
312		return ret;
313
314	mutex_lock(&data->update_lock);
315	temp = DIV_ROUND_CLOSEST(temp, 1000) + data->temp_offset;
316	temp = clamp_val(temp, 0, data->type == max6581 ? 255 : 127);
317	data->temp[nr][index] = temp;
318	ret = i2c_smbus_write_byte_data(data->client,
319					index == 2 ? MAX6697_REG_MAX[nr]
320						   : MAX6697_REG_CRIT[nr],
321					temp);
322	mutex_unlock(&data->update_lock);
323
324	return ret < 0 ? ret : count;
325}
326
327static ssize_t offset_store(struct device *dev, struct device_attribute *devattr, const char *buf,
328			    size_t count)
329{
330	int val, ret, index, select;
331	struct max6697_data *data;
332	bool channel_enabled;
333	long temp;
334
335	index = to_sensor_dev_attr(devattr)->index;
336	data = dev_get_drvdata(dev);
337	ret = kstrtol(buf, 10, &temp);
338	if (ret < 0)
339		return ret;
340
341	mutex_lock(&data->update_lock);
342	select = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET_SELECT);
343	if (select < 0) {
344		ret = select;
345		goto abort;
346	}
347	channel_enabled = (select & (1 << (index - 1)));
348	temp = clamp_val(temp, MAX6581_OFFSET_MIN, MAX6581_OFFSET_MAX);
349	val = DIV_ROUND_CLOSEST(temp, 250);
350	/* disable the offset for channel if the new offset is 0 */
351	if (val == 0) {
352		if (channel_enabled)
353			ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET_SELECT,
354							select & ~(1 << (index - 1)));
355		ret = ret < 0 ? ret : count;
356		goto abort;
357	}
358	if (!channel_enabled) {
359		ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET_SELECT,
360						select | (1 << (index - 1)));
361		if (ret < 0)
362			goto abort;
363	}
364	ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET, val);
365	ret = ret < 0 ? ret : count;
366
367abort:
368	mutex_unlock(&data->update_lock);
369	return ret;
370}
371
372static ssize_t offset_show(struct device *dev, struct device_attribute *devattr, char *buf)
373{
374	struct max6697_data *data;
375	int select, ret, index;
376
377	index = to_sensor_dev_attr(devattr)->index;
378	data = dev_get_drvdata(dev);
379	mutex_lock(&data->update_lock);
380	select = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET_SELECT);
381	if (select < 0)
382		ret = select;
383	else if (select & (1 << (index - 1)))
384		ret = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET);
385	else
386		ret = 0;
387	mutex_unlock(&data->update_lock);
388	return ret < 0 ? ret : sprintf(buf, "%d\n", max6581_offset_to_millic(ret));
389}
390
391static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
392static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0, MAX6697_TEMP_MAX);
393static SENSOR_DEVICE_ATTR_2_RW(temp1_crit, temp, 0, MAX6697_TEMP_CRIT);
394
395static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
396static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 1, MAX6697_TEMP_MAX);
397static SENSOR_DEVICE_ATTR_2_RW(temp2_crit, temp, 1, MAX6697_TEMP_CRIT);
398
399static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2);
400static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, MAX6697_TEMP_MAX);
401static SENSOR_DEVICE_ATTR_2_RW(temp3_crit, temp, 2, MAX6697_TEMP_CRIT);
402
403static SENSOR_DEVICE_ATTR_RO(temp4_input, temp_input, 3);
404static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 3, MAX6697_TEMP_MAX);
405static SENSOR_DEVICE_ATTR_2_RW(temp4_crit, temp, 3, MAX6697_TEMP_CRIT);
406
407static SENSOR_DEVICE_ATTR_RO(temp5_input, temp_input, 4);
408static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 4, MAX6697_TEMP_MAX);
409static SENSOR_DEVICE_ATTR_2_RW(temp5_crit, temp, 4, MAX6697_TEMP_CRIT);
410
411static SENSOR_DEVICE_ATTR_RO(temp6_input, temp_input, 5);
412static SENSOR_DEVICE_ATTR_2_RW(temp6_max, temp, 5, MAX6697_TEMP_MAX);
413static SENSOR_DEVICE_ATTR_2_RW(temp6_crit, temp, 5, MAX6697_TEMP_CRIT);
414
415static SENSOR_DEVICE_ATTR_RO(temp7_input, temp_input, 6);
416static SENSOR_DEVICE_ATTR_2_RW(temp7_max, temp, 6, MAX6697_TEMP_MAX);
417static SENSOR_DEVICE_ATTR_2_RW(temp7_crit, temp, 6, MAX6697_TEMP_CRIT);
418
419static SENSOR_DEVICE_ATTR_RO(temp8_input, temp_input, 7);
420static SENSOR_DEVICE_ATTR_2_RW(temp8_max, temp, 7, MAX6697_TEMP_MAX);
421static SENSOR_DEVICE_ATTR_2_RW(temp8_crit, temp, 7, MAX6697_TEMP_CRIT);
422
423static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 22);
424static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 16);
425static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, alarm, 17);
426static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, alarm, 18);
427static SENSOR_DEVICE_ATTR_RO(temp5_max_alarm, alarm, 19);
428static SENSOR_DEVICE_ATTR_RO(temp6_max_alarm, alarm, 20);
429static SENSOR_DEVICE_ATTR_RO(temp7_max_alarm, alarm, 21);
430static SENSOR_DEVICE_ATTR_RO(temp8_max_alarm, alarm, 23);
431
432static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 14);
433static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 8);
434static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, alarm, 9);
435static SENSOR_DEVICE_ATTR_RO(temp4_crit_alarm, alarm, 10);
436static SENSOR_DEVICE_ATTR_RO(temp5_crit_alarm, alarm, 11);
437static SENSOR_DEVICE_ATTR_RO(temp6_crit_alarm, alarm, 12);
438static SENSOR_DEVICE_ATTR_RO(temp7_crit_alarm, alarm, 13);
439static SENSOR_DEVICE_ATTR_RO(temp8_crit_alarm, alarm, 15);
440
441static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 1);
442static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 2);
443static SENSOR_DEVICE_ATTR_RO(temp4_fault, alarm, 3);
444static SENSOR_DEVICE_ATTR_RO(temp5_fault, alarm, 4);
445static SENSOR_DEVICE_ATTR_RO(temp6_fault, alarm, 5);
446static SENSOR_DEVICE_ATTR_RO(temp7_fault, alarm, 6);
447static SENSOR_DEVICE_ATTR_RO(temp8_fault, alarm, 7);
448
449/* There is no offset for local temperature so starting from temp2 */
450static SENSOR_DEVICE_ATTR_RW(temp2_offset, offset, 1);
451static SENSOR_DEVICE_ATTR_RW(temp3_offset, offset, 2);
452static SENSOR_DEVICE_ATTR_RW(temp4_offset, offset, 3);
453static SENSOR_DEVICE_ATTR_RW(temp5_offset, offset, 4);
454static SENSOR_DEVICE_ATTR_RW(temp6_offset, offset, 5);
455static SENSOR_DEVICE_ATTR_RW(temp7_offset, offset, 6);
456static SENSOR_DEVICE_ATTR_RW(temp8_offset, offset, 7);
457
458static DEVICE_ATTR(dummy, 0, NULL, NULL);
459
460static umode_t max6697_is_visible(struct kobject *kobj, struct attribute *attr,
461				  int index)
462{
463	struct device *dev = container_of(kobj, struct device, kobj);
464	struct max6697_data *data = dev_get_drvdata(dev);
465	const struct max6697_chip_data *chip = data->chip;
466	int channel = index / 7;	/* channel number */
467	int nr = index % 7;		/* attribute index within channel */
468
469	if (channel >= chip->channels)
470		return 0;
471
472	if ((nr == 3 || nr == 4) && !(chip->have_crit & (1 << channel)))
473		return 0;
474	if (nr == 5 && !(chip->have_fault & (1 << channel)))
475		return 0;
476	/* offset reg is only supported on max6581 remote channels */
477	if (nr == 6)
478		if (data->type != max6581 || channel == 0)
479			return 0;
480
481	return attr->mode;
482}
483
484/*
485 * max6697_is_visible uses the index into the following array to determine
486 * if attributes should be created or not. Any change in order or content
487 * must be matched in max6697_is_visible.
488 */
489static struct attribute *max6697_attributes[] = {
490	&sensor_dev_attr_temp1_input.dev_attr.attr,
491	&sensor_dev_attr_temp1_max.dev_attr.attr,
492	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
493	&sensor_dev_attr_temp1_crit.dev_attr.attr,
494	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
495	&dev_attr_dummy.attr,
496	&dev_attr_dummy.attr,
497
498	&sensor_dev_attr_temp2_input.dev_attr.attr,
499	&sensor_dev_attr_temp2_max.dev_attr.attr,
500	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
501	&sensor_dev_attr_temp2_crit.dev_attr.attr,
502	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
503	&sensor_dev_attr_temp2_fault.dev_attr.attr,
504	&sensor_dev_attr_temp2_offset.dev_attr.attr,
505
506	&sensor_dev_attr_temp3_input.dev_attr.attr,
507	&sensor_dev_attr_temp3_max.dev_attr.attr,
508	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
509	&sensor_dev_attr_temp3_crit.dev_attr.attr,
510	&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
511	&sensor_dev_attr_temp3_fault.dev_attr.attr,
512	&sensor_dev_attr_temp3_offset.dev_attr.attr,
513
514	&sensor_dev_attr_temp4_input.dev_attr.attr,
515	&sensor_dev_attr_temp4_max.dev_attr.attr,
516	&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
517	&sensor_dev_attr_temp4_crit.dev_attr.attr,
518	&sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
519	&sensor_dev_attr_temp4_fault.dev_attr.attr,
520	&sensor_dev_attr_temp4_offset.dev_attr.attr,
521
522	&sensor_dev_attr_temp5_input.dev_attr.attr,
523	&sensor_dev_attr_temp5_max.dev_attr.attr,
524	&sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
525	&sensor_dev_attr_temp5_crit.dev_attr.attr,
526	&sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
527	&sensor_dev_attr_temp5_fault.dev_attr.attr,
528	&sensor_dev_attr_temp5_offset.dev_attr.attr,
529
530	&sensor_dev_attr_temp6_input.dev_attr.attr,
531	&sensor_dev_attr_temp6_max.dev_attr.attr,
532	&sensor_dev_attr_temp6_max_alarm.dev_attr.attr,
533	&sensor_dev_attr_temp6_crit.dev_attr.attr,
534	&sensor_dev_attr_temp6_crit_alarm.dev_attr.attr,
535	&sensor_dev_attr_temp6_fault.dev_attr.attr,
536	&sensor_dev_attr_temp6_offset.dev_attr.attr,
537
538	&sensor_dev_attr_temp7_input.dev_attr.attr,
539	&sensor_dev_attr_temp7_max.dev_attr.attr,
540	&sensor_dev_attr_temp7_max_alarm.dev_attr.attr,
541	&sensor_dev_attr_temp7_crit.dev_attr.attr,
542	&sensor_dev_attr_temp7_crit_alarm.dev_attr.attr,
543	&sensor_dev_attr_temp7_fault.dev_attr.attr,
544	&sensor_dev_attr_temp7_offset.dev_attr.attr,
545
546	&sensor_dev_attr_temp8_input.dev_attr.attr,
547	&sensor_dev_attr_temp8_max.dev_attr.attr,
548	&sensor_dev_attr_temp8_max_alarm.dev_attr.attr,
549	&sensor_dev_attr_temp8_crit.dev_attr.attr,
550	&sensor_dev_attr_temp8_crit_alarm.dev_attr.attr,
551	&sensor_dev_attr_temp8_fault.dev_attr.attr,
552	&sensor_dev_attr_temp8_offset.dev_attr.attr,
553	NULL
554};
555
556static const struct attribute_group max6697_group = {
557	.attrs = max6697_attributes, .is_visible = max6697_is_visible,
558};
559__ATTRIBUTE_GROUPS(max6697);
560
561static void max6697_get_config_of(struct device_node *node,
562				  struct max6697_platform_data *pdata)
563{
564	int len;
565	const __be32 *prop;
566
567	pdata->smbus_timeout_disable =
568		of_property_read_bool(node, "smbus-timeout-disable");
569	pdata->extended_range_enable =
570		of_property_read_bool(node, "extended-range-enable");
571	pdata->beta_compensation =
572		of_property_read_bool(node, "beta-compensation-enable");
573
574	prop = of_get_property(node, "alert-mask", &len);
575	if (prop && len == sizeof(u32))
576		pdata->alert_mask = be32_to_cpu(prop[0]);
577	prop = of_get_property(node, "over-temperature-mask", &len);
578	if (prop && len == sizeof(u32))
579		pdata->over_temperature_mask = be32_to_cpu(prop[0]);
580	prop = of_get_property(node, "resistance-cancellation", &len);
581	if (prop) {
582		if (len == sizeof(u32))
583			pdata->resistance_cancellation = be32_to_cpu(prop[0]);
584		else
585			pdata->resistance_cancellation = 0xfe;
586	}
587	prop = of_get_property(node, "transistor-ideality", &len);
588	if (prop && len == 2 * sizeof(u32)) {
589			pdata->ideality_mask = be32_to_cpu(prop[0]);
590			pdata->ideality_value = be32_to_cpu(prop[1]);
591	}
592}
593
594static int max6697_init_chip(struct max6697_data *data,
595			     struct i2c_client *client)
596{
597	struct max6697_platform_data *pdata = dev_get_platdata(&client->dev);
598	struct max6697_platform_data p;
599	const struct max6697_chip_data *chip = data->chip;
600	int factor = chip->channels;
601	int ret, reg;
602
603	/*
604	 * Don't touch configuration if neither platform data nor OF
605	 * configuration was specified. If that is the case, use the
606	 * current chip configuration.
607	 */
608	if (!pdata && !client->dev.of_node) {
609		reg = i2c_smbus_read_byte_data(client, MAX6697_REG_CONFIG);
610		if (reg < 0)
611			return reg;
612		if (data->type == max6581) {
613			if (reg & MAX6581_CONF_EXTENDED)
614				data->temp_offset = 64;
615			reg = i2c_smbus_read_byte_data(client,
616						       MAX6581_REG_RESISTANCE);
617			if (reg < 0)
618				return reg;
619			factor += hweight8(reg);
620		} else {
621			if (reg & MAX6697_CONF_RESISTANCE)
622				factor++;
623		}
624		goto done;
625	}
626
627	if (client->dev.of_node) {
628		memset(&p, 0, sizeof(p));
629		max6697_get_config_of(client->dev.of_node, &p);
630		pdata = &p;
631	}
632
633	reg = 0;
634	if (pdata->smbus_timeout_disable &&
635	    (chip->valid_conf & MAX6697_CONF_TIMEOUT)) {
636		reg |= MAX6697_CONF_TIMEOUT;
637	}
638	if (pdata->extended_range_enable &&
639	    (chip->valid_conf & MAX6581_CONF_EXTENDED)) {
640		reg |= MAX6581_CONF_EXTENDED;
641		data->temp_offset = 64;
642	}
643	if (pdata->resistance_cancellation &&
644	    (chip->valid_conf & MAX6697_CONF_RESISTANCE)) {
645		reg |= MAX6697_CONF_RESISTANCE;
646		factor++;
647	}
648	if (pdata->beta_compensation &&
649	    (chip->valid_conf & MAX6693_CONF_BETA)) {
650		reg |= MAX6693_CONF_BETA;
651	}
652
653	ret = i2c_smbus_write_byte_data(client, MAX6697_REG_CONFIG, reg);
654	if (ret < 0)
655		return ret;
656
657	ret = i2c_smbus_write_byte_data(client, MAX6697_REG_ALERT_MASK,
658				MAX6697_ALERT_MAP_BITS(pdata->alert_mask));
659	if (ret < 0)
660		return ret;
661
662	ret = i2c_smbus_write_byte_data(client, MAX6697_REG_OVERT_MASK,
663			MAX6697_OVERT_MAP_BITS(pdata->over_temperature_mask));
664	if (ret < 0)
665		return ret;
666
667	if (data->type == max6581) {
668		factor += hweight8(pdata->resistance_cancellation >> 1);
669		ret = i2c_smbus_write_byte_data(client, MAX6581_REG_RESISTANCE,
670					pdata->resistance_cancellation >> 1);
671		if (ret < 0)
672			return ret;
673		ret = i2c_smbus_write_byte_data(client, MAX6581_REG_IDEALITY,
674						pdata->ideality_value);
675		if (ret < 0)
676			return ret;
677		ret = i2c_smbus_write_byte_data(client,
678						MAX6581_REG_IDEALITY_SELECT,
679						pdata->ideality_mask >> 1);
680		if (ret < 0)
681			return ret;
682	}
683done:
684	data->update_interval = factor * MAX6697_CONV_TIME;
685	return 0;
686}
687
688static int max6697_probe(struct i2c_client *client,
689			 const struct i2c_device_id *id)
 
690{
691	struct i2c_adapter *adapter = client->adapter;
692	struct device *dev = &client->dev;
693	struct max6697_data *data;
694	struct device *hwmon_dev;
695	int err;
696
697	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
698		return -ENODEV;
699
700	data = devm_kzalloc(dev, sizeof(struct max6697_data), GFP_KERNEL);
701	if (!data)
702		return -ENOMEM;
703
704	if (client->dev.of_node)
705		data->type = (enum chips)of_device_get_match_data(&client->dev);
706	else
707		data->type = id->driver_data;
708	data->chip = &max6697_chip_data[data->type];
709	data->client = client;
710	mutex_init(&data->update_lock);
711
712	err = max6697_init_chip(data, client);
713	if (err)
714		return err;
715
716	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
717							   data,
718							   max6697_groups);
719	return PTR_ERR_OR_ZERO(hwmon_dev);
720}
721
722static const struct i2c_device_id max6697_id[] = {
723	{ "max6581", max6581 },
724	{ "max6602", max6602 },
725	{ "max6622", max6622 },
726	{ "max6636", max6636 },
727	{ "max6689", max6689 },
728	{ "max6693", max6693 },
729	{ "max6694", max6694 },
730	{ "max6697", max6697 },
731	{ "max6698", max6698 },
732	{ "max6699", max6699 },
733	{ }
734};
735MODULE_DEVICE_TABLE(i2c, max6697_id);
736
737static const struct of_device_id __maybe_unused max6697_of_match[] = {
738	{
739		.compatible = "maxim,max6581",
740		.data = (void *)max6581
741	},
742	{
743		.compatible = "maxim,max6602",
744		.data = (void *)max6602
745	},
746	{
747		.compatible = "maxim,max6622",
748		.data = (void *)max6622
749	},
750	{
751		.compatible = "maxim,max6636",
752		.data = (void *)max6636
753	},
754	{
755		.compatible = "maxim,max6689",
756		.data = (void *)max6689
757	},
758	{
759		.compatible = "maxim,max6693",
760		.data = (void *)max6693
761	},
762	{
763		.compatible = "maxim,max6694",
764		.data = (void *)max6694
765	},
766	{
767		.compatible = "maxim,max6697",
768		.data = (void *)max6697
769	},
770	{
771		.compatible = "maxim,max6698",
772		.data = (void *)max6698
773	},
774	{
775		.compatible = "maxim,max6699",
776		.data = (void *)max6699
777	},
778	{ },
779};
780MODULE_DEVICE_TABLE(of, max6697_of_match);
781
782static struct i2c_driver max6697_driver = {
783	.class = I2C_CLASS_HWMON,
784	.driver = {
785		.name	= "max6697",
786		.of_match_table = of_match_ptr(max6697_of_match),
787	},
788	.probe = max6697_probe,
789	.id_table = max6697_id,
790};
791
792module_i2c_driver(max6697_driver);
793
794MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
795MODULE_DESCRIPTION("MAX6697 temperature sensor driver");
796MODULE_LICENSE("GPL");