1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Copyright (c) 2011 David George <david.george@ska.ac.za>
  4 *
  5 * based on adm1021.c
  6 * some credit to Christoph Scheurer, but largely a rewrite
  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
 19/* Addresses to scan */
 20static const unsigned short max1668_addr_list[] = {
 21	0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
 22
 23/* max1668 registers */
 24
 25#define MAX1668_REG_TEMP(nr)	(nr)
 26#define MAX1668_REG_STAT1	0x05
 27#define MAX1668_REG_STAT2	0x06
 28#define MAX1668_REG_MAN_ID	0xfe
 29#define MAX1668_REG_DEV_ID	0xff
 30
 31/* limits */
 32
 33/* write high limits */
 34#define MAX1668_REG_LIMH_WR(nr)	(0x13 + 2 * (nr))
 35/* write low limits */
 36#define MAX1668_REG_LIML_WR(nr)	(0x14 + 2 * (nr))
 37/* read high limits */
 38#define MAX1668_REG_LIMH_RD(nr)	(0x08 + 2 * (nr))
 39/* read low limits */
 40#define MAX1668_REG_LIML_RD(nr)	(0x09 + 2 * (nr))
 41
 42/* manufacturer and device ID Constants */
 43#define MAN_ID_MAXIM		0x4d
 44#define DEV_ID_MAX1668		0x3
 45#define DEV_ID_MAX1805		0x5
 46#define DEV_ID_MAX1989		0xb
 47
 48/* read only mode module parameter */
 49static bool read_only;
 50module_param(read_only, bool, 0);
 51MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");
 52
 53enum chips { max1668, max1805, max1989 };
 54
 55struct max1668_data {
 56	struct i2c_client *client;
 57	const struct attribute_group *groups[3];
 58	enum chips type;
 59
 60	struct mutex update_lock;
 61	bool valid;		/* true if following fields are valid */
 62	unsigned long last_updated;	/* In jiffies */
 63
 64	/* 1x local and 4x remote */
 65	s8 temp_max[5];
 66	s8 temp_min[5];
 67	s8 temp[5];
 68	u16 alarms;
 69};
 70
 71static struct max1668_data *max1668_update_device(struct device *dev)
 
 72{
 73	struct max1668_data *data = dev_get_drvdata(dev);
 74	struct i2c_client *client = data->client;
 75	struct max1668_data *ret = data;
 76	s32 val;
 77	int i;
 78
 79	mutex_lock(&data->update_lock);
 80
 81	if (data->valid && !time_after(jiffies,
 82			data->last_updated + HZ + HZ / 2))
 83		goto abort;
 84
 85	for (i = 0; i < 5; i++) {
 86		val = i2c_smbus_read_byte_data(client, MAX1668_REG_TEMP(i));
 87		if (unlikely(val < 0)) {
 88			ret = ERR_PTR(val);
 89			goto abort;
 90		}
 91		data->temp[i] = (s8) val;
 92
 93		val = i2c_smbus_read_byte_data(client, MAX1668_REG_LIMH_RD(i));
 94		if (unlikely(val < 0)) {
 95			ret = ERR_PTR(val);
 96			goto abort;
 97		}
 98		data->temp_max[i] = (s8) val;
 99
100		val = i2c_smbus_read_byte_data(client, MAX1668_REG_LIML_RD(i));
101		if (unlikely(val < 0)) {
102			ret = ERR_PTR(val);
103			goto abort;
104		}
105		data->temp_min[i] = (s8) val;
106	}
107
108	val = i2c_smbus_read_byte_data(client, MAX1668_REG_STAT1);
109	if (unlikely(val < 0)) {
110		ret = ERR_PTR(val);
111		goto abort;
112	}
113	data->alarms = val << 8;
114
115	val = i2c_smbus_read_byte_data(client, MAX1668_REG_STAT2);
116	if (unlikely(val < 0)) {
117		ret = ERR_PTR(val);
118		goto abort;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
119	}
120	data->alarms |= val;
121
122	data->last_updated = jiffies;
123	data->valid = true;
124abort:
125	mutex_unlock(&data->update_lock);
126
127	return ret;
128}
129
130static ssize_t show_temp(struct device *dev,
131			 struct device_attribute *devattr, char *buf)
132{
133	int index = to_sensor_dev_attr(devattr)->index;
134	struct max1668_data *data = max1668_update_device(dev);
135
136	if (IS_ERR(data))
137		return PTR_ERR(data);
138
139	return sprintf(buf, "%d\n", data->temp[index] * 1000);
140}
141
142static ssize_t show_temp_max(struct device *dev,
143			     struct device_attribute *devattr, char *buf)
144{
145	int index = to_sensor_dev_attr(devattr)->index;
146	struct max1668_data *data = max1668_update_device(dev);
147
148	if (IS_ERR(data))
149		return PTR_ERR(data);
150
151	return sprintf(buf, "%d\n", data->temp_max[index] * 1000);
152}
153
154static ssize_t show_temp_min(struct device *dev,
155			     struct device_attribute *devattr, char *buf)
156{
157	int index = to_sensor_dev_attr(devattr)->index;
158	struct max1668_data *data = max1668_update_device(dev);
159
160	if (IS_ERR(data))
161		return PTR_ERR(data);
162
163	return sprintf(buf, "%d\n", data->temp_min[index] * 1000);
164}
165
166static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
167			  char *buf)
168{
169	int index = to_sensor_dev_attr(attr)->index;
170	struct max1668_data *data = max1668_update_device(dev);
171
172	if (IS_ERR(data))
173		return PTR_ERR(data);
174
175	return sprintf(buf, "%u\n", (data->alarms >> index) & 0x1);
176}
177
178static ssize_t show_fault(struct device *dev,
179			  struct device_attribute *devattr, char *buf)
180{
181	int index = to_sensor_dev_attr(devattr)->index;
182	struct max1668_data *data = max1668_update_device(dev);
183
184	if (IS_ERR(data))
185		return PTR_ERR(data);
186
187	return sprintf(buf, "%u\n",
188		       (data->alarms & (1 << 12)) && data->temp[index] == 127);
189}
190
191static ssize_t set_temp_max(struct device *dev,
192			    struct device_attribute *devattr,
193			    const char *buf, size_t count)
194{
195	int index = to_sensor_dev_attr(devattr)->index;
196	struct max1668_data *data = dev_get_drvdata(dev);
197	struct i2c_client *client = data->client;
198	long temp;
199	int ret;
200
201	ret = kstrtol(buf, 10, &temp);
202	if (ret < 0)
203		return ret;
204
205	mutex_lock(&data->update_lock);
206	data->temp_max[index] = clamp_val(temp/1000, -128, 127);
207	ret = i2c_smbus_write_byte_data(client,
208					MAX1668_REG_LIMH_WR(index),
209					data->temp_max[index]);
210	if (ret < 0)
211		count = ret;
212	mutex_unlock(&data->update_lock);
213
214	return count;
215}
216
217static ssize_t set_temp_min(struct device *dev,
218			    struct device_attribute *devattr,
219			    const char *buf, size_t count)
220{
221	int index = to_sensor_dev_attr(devattr)->index;
222	struct max1668_data *data = dev_get_drvdata(dev);
223	struct i2c_client *client = data->client;
224	long temp;
225	int ret;
226
227	ret = kstrtol(buf, 10, &temp);
228	if (ret < 0)
229		return ret;
230
231	mutex_lock(&data->update_lock);
232	data->temp_min[index] = clamp_val(temp/1000, -128, 127);
233	ret = i2c_smbus_write_byte_data(client,
234					MAX1668_REG_LIML_WR(index),
235					data->temp_min[index]);
236	if (ret < 0)
237		count = ret;
238	mutex_unlock(&data->update_lock);
239
240	return count;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
241}
242
243static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
244static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max,
245				set_temp_max, 0);
246static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO, show_temp_min,
247				set_temp_min, 0);
248static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
249static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO, show_temp_max,
250				set_temp_max, 1);
251static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO, show_temp_min,
252				set_temp_min, 1);
253static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
254static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp_max,
255				set_temp_max, 2);
256static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO, show_temp_min,
257				set_temp_min, 2);
258static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
259static SENSOR_DEVICE_ATTR(temp4_max, S_IRUGO, show_temp_max,
260				set_temp_max, 3);
261static SENSOR_DEVICE_ATTR(temp4_min, S_IRUGO, show_temp_min,
262				set_temp_min, 3);
263static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp, NULL, 4);
264static SENSOR_DEVICE_ATTR(temp5_max, S_IRUGO, show_temp_max,
265				set_temp_max, 4);
266static SENSOR_DEVICE_ATTR(temp5_min, S_IRUGO, show_temp_min,
267				set_temp_min, 4);
268
269static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 14);
270static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 13);
271static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 7);
272static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 6);
273static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO, show_alarm, NULL, 5);
274static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 4);
275static SENSOR_DEVICE_ATTR(temp4_min_alarm, S_IRUGO, show_alarm, NULL, 3);
276static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 2);
277static SENSOR_DEVICE_ATTR(temp5_min_alarm, S_IRUGO, show_alarm, NULL, 1);
278static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO, show_alarm, NULL, 0);
279
280static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_fault, NULL, 1);
281static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_fault, NULL, 2);
282static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_fault, NULL, 3);
283static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_fault, NULL, 4);
284
285/* Attributes common to MAX1668, MAX1989 and MAX1805 */
286static struct attribute *max1668_attribute_common[] = {
287	&sensor_dev_attr_temp1_max.dev_attr.attr,
288	&sensor_dev_attr_temp1_min.dev_attr.attr,
289	&sensor_dev_attr_temp1_input.dev_attr.attr,
290	&sensor_dev_attr_temp2_max.dev_attr.attr,
291	&sensor_dev_attr_temp2_min.dev_attr.attr,
292	&sensor_dev_attr_temp2_input.dev_attr.attr,
293	&sensor_dev_attr_temp3_max.dev_attr.attr,
294	&sensor_dev_attr_temp3_min.dev_attr.attr,
295	&sensor_dev_attr_temp3_input.dev_attr.attr,
296
297	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
298	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
299	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
300	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
301	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
302	&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
303
304	&sensor_dev_attr_temp2_fault.dev_attr.attr,
305	&sensor_dev_attr_temp3_fault.dev_attr.attr,
306	NULL
307};
308
309/* Attributes not present on MAX1805 */
310static struct attribute *max1668_attribute_unique[] = {
311	&sensor_dev_attr_temp4_max.dev_attr.attr,
312	&sensor_dev_attr_temp4_min.dev_attr.attr,
313	&sensor_dev_attr_temp4_input.dev_attr.attr,
314	&sensor_dev_attr_temp5_max.dev_attr.attr,
315	&sensor_dev_attr_temp5_min.dev_attr.attr,
316	&sensor_dev_attr_temp5_input.dev_attr.attr,
317
318	&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
319	&sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
320	&sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
321	&sensor_dev_attr_temp5_min_alarm.dev_attr.attr,
322
323	&sensor_dev_attr_temp4_fault.dev_attr.attr,
324	&sensor_dev_attr_temp5_fault.dev_attr.attr,
325	NULL
326};
327
328static umode_t max1668_attribute_mode(struct kobject *kobj,
329				     struct attribute *attr, int index)
330{
331	umode_t ret = S_IRUGO;
332	if (read_only)
333		return ret;
334	if (attr == &sensor_dev_attr_temp1_max.dev_attr.attr ||
335	    attr == &sensor_dev_attr_temp2_max.dev_attr.attr ||
336	    attr == &sensor_dev_attr_temp3_max.dev_attr.attr ||
337	    attr == &sensor_dev_attr_temp4_max.dev_attr.attr ||
338	    attr == &sensor_dev_attr_temp5_max.dev_attr.attr ||
339	    attr == &sensor_dev_attr_temp1_min.dev_attr.attr ||
340	    attr == &sensor_dev_attr_temp2_min.dev_attr.attr ||
341	    attr == &sensor_dev_attr_temp3_min.dev_attr.attr ||
342	    attr == &sensor_dev_attr_temp4_min.dev_attr.attr ||
343	    attr == &sensor_dev_attr_temp5_min.dev_attr.attr)
344		ret |= S_IWUSR;
345	return ret;
346}
347
348static const struct attribute_group max1668_group_common = {
349	.attrs = max1668_attribute_common,
350	.is_visible = max1668_attribute_mode
351};
352
353static const struct attribute_group max1668_group_unique = {
354	.attrs = max1668_attribute_unique,
355	.is_visible = max1668_attribute_mode
356};
357
358/* Return 0 if detection is successful, -ENODEV otherwise */
359static int max1668_detect(struct i2c_client *client,
360			  struct i2c_board_info *info)
361{
362	struct i2c_adapter *adapter = client->adapter;
363	const char *type_name;
364	int man_id, dev_id;
365
366	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
367		return -ENODEV;
368
369	/* Check for unsupported part */
370	man_id = i2c_smbus_read_byte_data(client, MAX1668_REG_MAN_ID);
371	if (man_id != MAN_ID_MAXIM)
372		return -ENODEV;
373
374	dev_id = i2c_smbus_read_byte_data(client, MAX1668_REG_DEV_ID);
375	if (dev_id < 0)
376		return -ENODEV;
377
378	type_name = NULL;
379	if (dev_id == DEV_ID_MAX1668)
380		type_name = "max1668";
381	else if (dev_id == DEV_ID_MAX1805)
382		type_name = "max1805";
383	else if (dev_id == DEV_ID_MAX1989)
384		type_name = "max1989";
385
386	if (!type_name)
387		return -ENODEV;
388
389	strscpy(info->type, type_name, I2C_NAME_SIZE);
390
391	return 0;
392}
393
394static const struct i2c_device_id max1668_id[];
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
395
396static int max1668_probe(struct i2c_client *client)
397{
398	struct i2c_adapter *adapter = client->adapter;
399	struct device *dev = &client->dev;
400	struct device *hwmon_dev;
401	struct max1668_data *data;
402
403	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
404		return -ENODEV;
405
406	data = devm_kzalloc(dev, sizeof(struct max1668_data), GFP_KERNEL);
407	if (!data)
408		return -ENOMEM;
409
410	data->client = client;
411	data->type = i2c_match_id(max1668_id, client)->driver_data;
412	mutex_init(&data->update_lock);
413
414	/* sysfs hooks */
415	data->groups[0] = &max1668_group_common;
416	if (data->type == max1668 || data->type == max1989)
417		data->groups[1] = &max1668_group_unique;
418
419	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
420							   data, data->groups);
421	return PTR_ERR_OR_ZERO(hwmon_dev);
422}
423
424static const struct i2c_device_id max1668_id[] = {
425	{ "max1668", max1668 },
426	{ "max1805", max1805 },
427	{ "max1989", max1989 },
428	{ }
429};
430MODULE_DEVICE_TABLE(i2c, max1668_id);
431
432/* This is the driver that will be inserted */
433static struct i2c_driver max1668_driver = {
434	.class = I2C_CLASS_HWMON,
435	.driver = {
436		  .name	= "max1668",
437		  },
438	.probe_new = max1668_probe,
439	.id_table = max1668_id,
440	.detect	= max1668_detect,
441	.address_list = max1668_addr_list,
442};
443
444module_i2c_driver(max1668_driver);
445
446MODULE_AUTHOR("David George <david.george@ska.ac.za>");
447MODULE_DESCRIPTION("MAX1668 remote temperature sensor driver");
448MODULE_LICENSE("GPL");

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Copyright (c) 2011 David George <david.george@ska.ac.za>
  4 *
  5 * based on adm1021.c
  6 * some credit to Christoph Scheurer, but largely a rewrite
  7 */
  8
  9#include <linux/bitops.h>
 10#include <linux/bits.h>
 11#include <linux/err.h>
 12#include <linux/hwmon.h>
 13#include <linux/i2c.h>
 14#include <linux/init.h>
 15#include <linux/module.h>
 16#include <linux/regmap.h>
 17#include <linux/slab.h>
 
 
 
 
 
 
 18
 19/* Addresses to scan */
 20static const unsigned short max1668_addr_list[] = {
 21	0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
 22
 23/* max1668 registers */
 24
 25#define MAX1668_REG_TEMP(nr)	(nr)
 26#define MAX1668_REG_STAT1	0x05
 27#define MAX1668_REG_STAT2	0x06
 28#define MAX1668_REG_MAN_ID	0xfe
 29#define MAX1668_REG_DEV_ID	0xff
 30
 31/* limits */
 32
 33/* high limits */
 34#define MAX1668_REG_LIMH(nr)	(0x08 + 2 * (nr))
 
 
 
 
 35/* read low limits */
 36#define MAX1668_REG_LIML(nr)	(0x09 + 2 * (nr))
 37
 38/* manufacturer and device ID Constants */
 39#define MAN_ID_MAXIM		0x4d
 40#define DEV_ID_MAX1668		0x3
 41#define DEV_ID_MAX1805		0x5
 42#define DEV_ID_MAX1989		0xb
 43
 44/* read only mode module parameter */
 45static bool read_only;
 46module_param(read_only, bool, 0);
 47MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");
 48
 
 
 49struct max1668_data {
 50	struct regmap *regmap;
 51	int channels;
 
 
 
 
 
 
 
 
 
 
 
 52};
 53
 54static int max1668_read(struct device *dev, enum hwmon_sensor_types type,
 55			u32 attr, int channel, long *val)
 56{
 57	struct max1668_data *data = dev_get_drvdata(dev);
 58	struct regmap *regmap = data->regmap;
 59	u32 regs[2] = { MAX1668_REG_STAT1, MAX1668_REG_TEMP(channel) };
 60	u8 regvals[2];
 61	u32 regval;
 62	int ret;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 63
 64	switch (attr) {
 65	case hwmon_temp_input:
 66		ret = regmap_read(regmap, MAX1668_REG_TEMP(channel), &regval);
 67		if (ret)
 68			return ret;
 69		*val = sign_extend32(regval, 7) * 1000;
 70		break;
 71	case hwmon_temp_min:
 72		ret = regmap_read(regmap, MAX1668_REG_LIML(channel), &regval);
 73		if (ret)
 74			return ret;
 75		*val = sign_extend32(regval, 7) * 1000;
 76		break;
 77	case hwmon_temp_max:
 78		ret = regmap_read(regmap, MAX1668_REG_LIMH(channel), &regval);
 79		if (ret)
 80			return ret;
 81		*val = sign_extend32(regval, 7) * 1000;
 82		break;
 83	case hwmon_temp_min_alarm:
 84		ret = regmap_read(regmap,
 85				  channel ? MAX1668_REG_STAT2 : MAX1668_REG_STAT1,
 86				  &regval);
 87		if (ret)
 88			return ret;
 89		if (channel)
 90			*val = !!(regval & BIT(9 - channel * 2));
 91		else
 92			*val = !!(regval & BIT(5));
 93		break;
 94	case hwmon_temp_max_alarm:
 95		ret = regmap_read(regmap,
 96				  channel ? MAX1668_REG_STAT2 : MAX1668_REG_STAT1,
 97				  &regval);
 98		if (ret)
 99			return ret;
100		if (channel)
101			*val = !!(regval & BIT(8 - channel * 2));
102		else
103			*val = !!(regval & BIT(6));
104		break;
105	case hwmon_temp_fault:
106		ret = regmap_multi_reg_read(regmap, regs, regvals, 2);
107		if (ret)
108			return ret;
109		*val = !!((regvals[0] & BIT(4)) && regvals[1] == 127);
110		break;
111	default:
112		return -EOPNOTSUPP;
113	}
114	return 0;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
115}
116
117static int max1668_write(struct device *dev, enum hwmon_sensor_types type,
118			 u32 attr, int channel, long val)
 
119{
 
120	struct max1668_data *data = dev_get_drvdata(dev);
121	struct regmap *regmap = data->regmap;
 
 
122
123	val = clamp_val(val / 1000, -128, 127);
 
 
124
125	switch (attr) {
126	case hwmon_temp_min:
127		return regmap_write(regmap, MAX1668_REG_LIML(channel), val);
128	case hwmon_temp_max:
129		return regmap_write(regmap, MAX1668_REG_LIMH(channel), val);
130	default:
131		return -EOPNOTSUPP;
132	}
 
 
133}
134
135static umode_t max1668_is_visible(const void *_data, enum hwmon_sensor_types type,
136				  u32 attr, int channel)
 
137{
138	const struct max1668_data *data = _data;
 
 
 
 
139
140	if (channel >= data->channels)
141		return 0;
 
 
 
 
 
 
 
 
 
 
142
143	switch (attr) {
144	case hwmon_temp_min:
145	case hwmon_temp_max:
146		return read_only ? 0444 : 0644;
147	case hwmon_temp_input:
148	case hwmon_temp_min_alarm:
149	case hwmon_temp_max_alarm:
150		return 0444;
151	case hwmon_temp_fault:
152		if (channel)
153			return 0444;
154		break;
155	default:
156		break;
157	}
158	return 0;
159}
160
161static const struct hwmon_channel_info * const max1668_info[] = {
162	HWMON_CHANNEL_INFO(temp,
163			   HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
164			   HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM,
165			   HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
166			   HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM |
167			   HWMON_T_FAULT,
168			   HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
169			   HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM |
170			   HWMON_T_FAULT,
171			   HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
172			   HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM |
173			   HWMON_T_FAULT,
174			   HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
175			   HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM |
176			   HWMON_T_FAULT),
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
177	NULL
178};
179
180static const struct hwmon_ops max1668_hwmon_ops = {
181	.is_visible = max1668_is_visible,
182	.read = max1668_read,
183	.write = max1668_write,
 
 
 
 
 
 
 
 
 
 
 
 
 
184};
185
186static const struct hwmon_chip_info max1668_chip_info = {
187	.ops = &max1668_hwmon_ops,
188	.info = max1668_info,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
189};
190
191/* Return 0 if detection is successful, -ENODEV otherwise */
192static int max1668_detect(struct i2c_client *client,
193			  struct i2c_board_info *info)
194{
195	struct i2c_adapter *adapter = client->adapter;
196	const char *type_name;
197	int man_id, dev_id;
198
199	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
200		return -ENODEV;
201
202	/* Check for unsupported part */
203	man_id = i2c_smbus_read_byte_data(client, MAX1668_REG_MAN_ID);
204	if (man_id != MAN_ID_MAXIM)
205		return -ENODEV;
206
207	dev_id = i2c_smbus_read_byte_data(client, MAX1668_REG_DEV_ID);
208	if (dev_id < 0)
209		return -ENODEV;
210
211	type_name = NULL;
212	if (dev_id == DEV_ID_MAX1668)
213		type_name = "max1668";
214	else if (dev_id == DEV_ID_MAX1805)
215		type_name = "max1805";
216	else if (dev_id == DEV_ID_MAX1989)
217		type_name = "max1989";
218
219	if (!type_name)
220		return -ENODEV;
221
222	strscpy(info->type, type_name, I2C_NAME_SIZE);
223
224	return 0;
225}
226
227/* regmap */
228
229static int max1668_reg_read(void *context, unsigned int reg, unsigned int *val)
230{
231	int ret;
232
233	ret = i2c_smbus_read_byte_data(context, reg);
234	if (ret < 0)
235		return ret;
236
237	*val = ret;
238	return 0;
239}
240
241static int max1668_reg_write(void *context, unsigned int reg, unsigned int val)
242{
243	return i2c_smbus_write_byte_data(context, reg + 11, val);
244}
245
246static bool max1668_regmap_is_volatile(struct device *dev, unsigned int reg)
247{
248	return reg <= MAX1668_REG_STAT2;
249}
250
251static bool max1668_regmap_is_writeable(struct device *dev, unsigned int reg)
252{
253	return reg > MAX1668_REG_STAT2 && reg <= MAX1668_REG_LIML(4);
254}
255
256static const struct regmap_config max1668_regmap_config = {
257	.reg_bits = 8,
258	.val_bits = 8,
259	.cache_type = REGCACHE_MAPLE,
260	.volatile_reg = max1668_regmap_is_volatile,
261	.writeable_reg = max1668_regmap_is_writeable,
262};
263
264static const struct regmap_bus max1668_regmap_bus = {
265	.reg_write = max1668_reg_write,
266	.reg_read = max1668_reg_read,
267};
268
269static int max1668_probe(struct i2c_client *client)
270{
271	struct i2c_adapter *adapter = client->adapter;
272	struct device *dev = &client->dev;
273	struct device *hwmon_dev;
274	struct max1668_data *data;
275
276	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
277		return -ENODEV;
278
279	data = devm_kzalloc(dev, sizeof(struct max1668_data), GFP_KERNEL);
280	if (!data)
281		return -ENOMEM;
282
283	data->regmap = devm_regmap_init(dev, &max1668_regmap_bus, client,
284					&max1668_regmap_config);
285	if (IS_ERR(data->regmap))
286		return PTR_ERR(data->regmap);
287
288	data->channels = (uintptr_t)i2c_get_match_data(client);
 
 
289
290	hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data,
291							 &max1668_chip_info, NULL);
292	return PTR_ERR_OR_ZERO(hwmon_dev);
293}
294
295static const struct i2c_device_id max1668_id[] = {
296	{ "max1668", 5 },
297	{ "max1805", 3 },
298	{ "max1989", 5 },
299	{ }
300};
301MODULE_DEVICE_TABLE(i2c, max1668_id);
302
303/* This is the driver that will be inserted */
304static struct i2c_driver max1668_driver = {
305	.class = I2C_CLASS_HWMON,
306	.driver = {
307		  .name	= "max1668",
308		  },
309	.probe = max1668_probe,
310	.id_table = max1668_id,
311	.detect	= max1668_detect,
312	.address_list = max1668_addr_list,
313};
314
315module_i2c_driver(max1668_driver);
316
317MODULE_AUTHOR("David George <david.george@ska.ac.za>");
318MODULE_DESCRIPTION("MAX1668 remote temperature sensor driver");
319MODULE_LICENSE("GPL");