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/drivers/hwmon/jc42.c

https://bitbucket.org/ndreys/linux-sunxi
C | 644 lines | 492 code | 100 blank | 52 comment | 51 complexity | 83ae7b3f3774d7d84c88cafc7ccf03f9 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  1/*
  2 * jc42.c - driver for Jedec JC42.4 compliant temperature sensors
  3 *
  4 * Copyright (c) 2010  Ericsson AB.
  5 *
  6 * Derived from lm77.c by Andras BALI <drewie@freemail.hu>.
  7 *
  8 * JC42.4 compliant temperature sensors are typically used on memory modules.
  9 *
 10 * This program is free software; you can redistribute it and/or modify
 11 * it under the terms of the GNU General Public License as published by
 12 * the Free Software Foundation; either version 2 of the License, or
 13 * (at your option) any later version.
 14 *
 15 * This program is distributed in the hope that it will be useful,
 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 18 * GNU General Public License for more details.
 19 *
 20 * You should have received a copy of the GNU General Public License
 21 * along with this program; if not, write to the Free Software
 22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 23 */
 24
 25#include <linux/module.h>
 26#include <linux/init.h>
 27#include <linux/slab.h>
 28#include <linux/jiffies.h>
 29#include <linux/i2c.h>
 30#include <linux/hwmon.h>
 31#include <linux/hwmon-sysfs.h>
 32#include <linux/err.h>
 33#include <linux/mutex.h>
 34
 35/* Addresses to scan */
 36static const unsigned short normal_i2c[] = {
 37	0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, I2C_CLIENT_END };
 38
 39/* JC42 registers. All registers are 16 bit. */
 40#define JC42_REG_CAP		0x00
 41#define JC42_REG_CONFIG		0x01
 42#define JC42_REG_TEMP_UPPER	0x02
 43#define JC42_REG_TEMP_LOWER	0x03
 44#define JC42_REG_TEMP_CRITICAL	0x04
 45#define JC42_REG_TEMP		0x05
 46#define JC42_REG_MANID		0x06
 47#define JC42_REG_DEVICEID	0x07
 48
 49/* Status bits in temperature register */
 50#define JC42_ALARM_CRIT_BIT	15
 51#define JC42_ALARM_MAX_BIT	14
 52#define JC42_ALARM_MIN_BIT	13
 53
 54/* Configuration register defines */
 55#define JC42_CFG_CRIT_ONLY	(1 << 2)
 56#define JC42_CFG_TCRIT_LOCK	(1 << 6)
 57#define JC42_CFG_EVENT_LOCK	(1 << 7)
 58#define JC42_CFG_SHUTDOWN	(1 << 8)
 59#define JC42_CFG_HYST_SHIFT	9
 60#define JC42_CFG_HYST_MASK	0x03
 61
 62/* Capabilities */
 63#define JC42_CAP_RANGE		(1 << 2)
 64
 65/* Manufacturer IDs */
 66#define ADT_MANID		0x11d4  /* Analog Devices */
 67#define ATMEL_MANID		0x001f  /* Atmel */
 68#define MAX_MANID		0x004d  /* Maxim */
 69#define IDT_MANID		0x00b3  /* IDT */
 70#define MCP_MANID		0x0054  /* Microchip */
 71#define NXP_MANID		0x1131  /* NXP Semiconductors */
 72#define ONS_MANID		0x1b09  /* ON Semiconductor */
 73#define STM_MANID		0x104a  /* ST Microelectronics */
 74
 75/* Supported chips */
 76
 77/* Analog Devices */
 78#define ADT7408_DEVID		0x0801
 79#define ADT7408_DEVID_MASK	0xffff
 80
 81/* Atmel */
 82#define AT30TS00_DEVID		0x8201
 83#define AT30TS00_DEVID_MASK	0xffff
 84
 85/* IDT */
 86#define TS3000B3_DEVID		0x2903  /* Also matches TSE2002B3 */
 87#define TS3000B3_DEVID_MASK	0xffff
 88
 89#define TS3000GB2_DEVID		0x2912  /* Also matches TSE2002GB2 */
 90#define TS3000GB2_DEVID_MASK	0xffff
 91
 92/* Maxim */
 93#define MAX6604_DEVID		0x3e00
 94#define MAX6604_DEVID_MASK	0xffff
 95
 96/* Microchip */
 97#define MCP9804_DEVID		0x0200
 98#define MCP9804_DEVID_MASK	0xfffc
 99
100#define MCP98242_DEVID		0x2000
101#define MCP98242_DEVID_MASK	0xfffc
102
103#define MCP98243_DEVID		0x2100
104#define MCP98243_DEVID_MASK	0xfffc
105
106#define MCP9843_DEVID		0x0000	/* Also matches mcp9805 */
107#define MCP9843_DEVID_MASK	0xfffe
108
109/* NXP */
110#define SE97_DEVID		0xa200
111#define SE97_DEVID_MASK		0xfffc
112
113#define SE98_DEVID		0xa100
114#define SE98_DEVID_MASK		0xfffc
115
116/* ON Semiconductor */
117#define CAT6095_DEVID		0x0800	/* Also matches CAT34TS02 */
118#define CAT6095_DEVID_MASK	0xffe0
119
120/* ST Microelectronics */
121#define STTS424_DEVID		0x0101
122#define STTS424_DEVID_MASK	0xffff
123
124#define STTS424E_DEVID		0x0000
125#define STTS424E_DEVID_MASK	0xfffe
126
127#define STTS2002_DEVID		0x0300
128#define STTS2002_DEVID_MASK	0xffff
129
130#define STTS3000_DEVID		0x0200
131#define STTS3000_DEVID_MASK	0xffff
132
133static u16 jc42_hysteresis[] = { 0, 1500, 3000, 6000 };
134
135struct jc42_chips {
136	u16 manid;
137	u16 devid;
138	u16 devid_mask;
139};
140
141static struct jc42_chips jc42_chips[] = {
142	{ ADT_MANID, ADT7408_DEVID, ADT7408_DEVID_MASK },
143	{ ATMEL_MANID, AT30TS00_DEVID, AT30TS00_DEVID_MASK },
144	{ IDT_MANID, TS3000B3_DEVID, TS3000B3_DEVID_MASK },
145	{ IDT_MANID, TS3000GB2_DEVID, TS3000GB2_DEVID_MASK },
146	{ MAX_MANID, MAX6604_DEVID, MAX6604_DEVID_MASK },
147	{ MCP_MANID, MCP9804_DEVID, MCP9804_DEVID_MASK },
148	{ MCP_MANID, MCP98242_DEVID, MCP98242_DEVID_MASK },
149	{ MCP_MANID, MCP98243_DEVID, MCP98243_DEVID_MASK },
150	{ MCP_MANID, MCP9843_DEVID, MCP9843_DEVID_MASK },
151	{ NXP_MANID, SE97_DEVID, SE97_DEVID_MASK },
152	{ ONS_MANID, CAT6095_DEVID, CAT6095_DEVID_MASK },
153	{ NXP_MANID, SE98_DEVID, SE98_DEVID_MASK },
154	{ STM_MANID, STTS424_DEVID, STTS424_DEVID_MASK },
155	{ STM_MANID, STTS424E_DEVID, STTS424E_DEVID_MASK },
156	{ STM_MANID, STTS2002_DEVID, STTS2002_DEVID_MASK },
157	{ STM_MANID, STTS3000_DEVID, STTS3000_DEVID_MASK },
158};
159
160/* Each client has this additional data */
161struct jc42_data {
162	struct device	*hwmon_dev;
163	struct mutex	update_lock;	/* protect register access */
164	bool		extended;	/* true if extended range supported */
165	bool		valid;
166	unsigned long	last_updated;	/* In jiffies */
167	u16		orig_config;	/* original configuration */
168	u16		config;		/* current configuration */
169	u16		temp_input;	/* Temperatures */
170	u16		temp_crit;
171	u16		temp_min;
172	u16		temp_max;
173};
174
175static int jc42_probe(struct i2c_client *client,
176		      const struct i2c_device_id *id);
177static int jc42_detect(struct i2c_client *client, struct i2c_board_info *info);
178static int jc42_remove(struct i2c_client *client);
179static int jc42_read_value(struct i2c_client *client, u8 reg);
180static int jc42_write_value(struct i2c_client *client, u8 reg, u16 value);
181
182static struct jc42_data *jc42_update_device(struct device *dev);
183
184static const struct i2c_device_id jc42_id[] = {
185	{ "adt7408", 0 },
186	{ "at30ts00", 0 },
187	{ "cat94ts02", 0 },
188	{ "cat6095", 0 },
189	{ "jc42", 0 },
190	{ "max6604", 0 },
191	{ "mcp9804", 0 },
192	{ "mcp9805", 0 },
193	{ "mcp98242", 0 },
194	{ "mcp98243", 0 },
195	{ "mcp9843", 0 },
196	{ "se97", 0 },
197	{ "se97b", 0 },
198	{ "se98", 0 },
199	{ "stts424", 0 },
200	{ "stts2002", 0 },
201	{ "stts3000", 0 },
202	{ "tse2002", 0 },
203	{ "ts3000", 0 },
204	{ }
205};
206MODULE_DEVICE_TABLE(i2c, jc42_id);
207
208#ifdef CONFIG_PM
209
210static int jc42_suspend(struct device *dev)
211{
212	struct i2c_client *client = to_i2c_client(dev);
213	struct jc42_data *data = i2c_get_clientdata(client);
214
215	data->config |= JC42_CFG_SHUTDOWN;
216	jc42_write_value(client, JC42_REG_CONFIG, data->config);
217	return 0;
218}
219
220static int jc42_resume(struct device *dev)
221{
222	struct i2c_client *client = to_i2c_client(dev);
223	struct jc42_data *data = i2c_get_clientdata(client);
224
225	data->config &= ~JC42_CFG_SHUTDOWN;
226	jc42_write_value(client, JC42_REG_CONFIG, data->config);
227	return 0;
228}
229
230static const struct dev_pm_ops jc42_dev_pm_ops = {
231	.suspend = jc42_suspend,
232	.resume = jc42_resume,
233};
234
235#define JC42_DEV_PM_OPS (&jc42_dev_pm_ops)
236#else
237#define JC42_DEV_PM_OPS NULL
238#endif /* CONFIG_PM */
239
240/* This is the driver that will be inserted */
241static struct i2c_driver jc42_driver = {
242	.class		= I2C_CLASS_SPD,
243	.driver = {
244		.name	= "jc42",
245		.pm = JC42_DEV_PM_OPS,
246	},
247	.probe		= jc42_probe,
248	.remove		= jc42_remove,
249	.id_table	= jc42_id,
250	.detect		= jc42_detect,
251	.address_list	= normal_i2c,
252};
253
254#define JC42_TEMP_MIN_EXTENDED	(-40000)
255#define JC42_TEMP_MIN		0
256#define JC42_TEMP_MAX		125000
257
258static u16 jc42_temp_to_reg(int temp, bool extended)
259{
260	int ntemp = SENSORS_LIMIT(temp,
261				  extended ? JC42_TEMP_MIN_EXTENDED :
262				  JC42_TEMP_MIN, JC42_TEMP_MAX);
263
264	/* convert from 0.001 to 0.0625 resolution */
265	return (ntemp * 2 / 125) & 0x1fff;
266}
267
268static int jc42_temp_from_reg(s16 reg)
269{
270	reg &= 0x1fff;
271
272	/* sign extend register */
273	if (reg & 0x1000)
274		reg |= 0xf000;
275
276	/* convert from 0.0625 to 0.001 resolution */
277	return reg * 125 / 2;
278}
279
280/* sysfs stuff */
281
282/* read routines for temperature limits */
283#define show(value)	\
284static ssize_t show_##value(struct device *dev,				\
285			    struct device_attribute *attr,		\
286			    char *buf)					\
287{									\
288	struct jc42_data *data = jc42_update_device(dev);		\
289	if (IS_ERR(data))						\
290		return PTR_ERR(data);					\
291	return sprintf(buf, "%d\n", jc42_temp_from_reg(data->value));	\
292}
293
294show(temp_input);
295show(temp_crit);
296show(temp_min);
297show(temp_max);
298
299/* read routines for hysteresis values */
300static ssize_t show_temp_crit_hyst(struct device *dev,
301				   struct device_attribute *attr, char *buf)
302{
303	struct jc42_data *data = jc42_update_device(dev);
304	int temp, hyst;
305
306	if (IS_ERR(data))
307		return PTR_ERR(data);
308
309	temp = jc42_temp_from_reg(data->temp_crit);
310	hyst = jc42_hysteresis[(data->config >> JC42_CFG_HYST_SHIFT)
311			       & JC42_CFG_HYST_MASK];
312	return sprintf(buf, "%d\n", temp - hyst);
313}
314
315static ssize_t show_temp_max_hyst(struct device *dev,
316				  struct device_attribute *attr, char *buf)
317{
318	struct jc42_data *data = jc42_update_device(dev);
319	int temp, hyst;
320
321	if (IS_ERR(data))
322		return PTR_ERR(data);
323
324	temp = jc42_temp_from_reg(data->temp_max);
325	hyst = jc42_hysteresis[(data->config >> JC42_CFG_HYST_SHIFT)
326			       & JC42_CFG_HYST_MASK];
327	return sprintf(buf, "%d\n", temp - hyst);
328}
329
330/* write routines */
331#define set(value, reg)	\
332static ssize_t set_##value(struct device *dev,				\
333			   struct device_attribute *attr,		\
334			   const char *buf, size_t count)		\
335{									\
336	struct i2c_client *client = to_i2c_client(dev);			\
337	struct jc42_data *data = i2c_get_clientdata(client);		\
338	int err, ret = count;						\
339	long val;							\
340	if (strict_strtol(buf, 10, &val) < 0)				\
341		return -EINVAL;						\
342	mutex_lock(&data->update_lock);					\
343	data->value = jc42_temp_to_reg(val, data->extended);		\
344	err = jc42_write_value(client, reg, data->value);		\
345	if (err < 0)							\
346		ret = err;						\
347	mutex_unlock(&data->update_lock);				\
348	return ret;							\
349}
350
351set(temp_min, JC42_REG_TEMP_LOWER);
352set(temp_max, JC42_REG_TEMP_UPPER);
353set(temp_crit, JC42_REG_TEMP_CRITICAL);
354
355/* JC42.4 compliant chips only support four hysteresis values.
356 * Pick best choice and go from there. */
357static ssize_t set_temp_crit_hyst(struct device *dev,
358				  struct device_attribute *attr,
359				  const char *buf, size_t count)
360{
361	struct i2c_client *client = to_i2c_client(dev);
362	struct jc42_data *data = i2c_get_clientdata(client);
363	unsigned long val;
364	int diff, hyst;
365	int err;
366	int ret = count;
367
368	if (strict_strtoul(buf, 10, &val) < 0)
369		return -EINVAL;
370
371	diff = jc42_temp_from_reg(data->temp_crit) - val;
372	hyst = 0;
373	if (diff > 0) {
374		if (diff < 2250)
375			hyst = 1;	/* 1.5 degrees C */
376		else if (diff < 4500)
377			hyst = 2;	/* 3.0 degrees C */
378		else
379			hyst = 3;	/* 6.0 degrees C */
380	}
381
382	mutex_lock(&data->update_lock);
383	data->config = (data->config
384			& ~(JC42_CFG_HYST_MASK << JC42_CFG_HYST_SHIFT))
385	  | (hyst << JC42_CFG_HYST_SHIFT);
386	err = jc42_write_value(client, JC42_REG_CONFIG, data->config);
387	if (err < 0)
388		ret = err;
389	mutex_unlock(&data->update_lock);
390	return ret;
391}
392
393static ssize_t show_alarm(struct device *dev,
394			  struct device_attribute *attr, char *buf)
395{
396	u16 bit = to_sensor_dev_attr(attr)->index;
397	struct jc42_data *data = jc42_update_device(dev);
398	u16 val;
399
400	if (IS_ERR(data))
401		return PTR_ERR(data);
402
403	val = data->temp_input;
404	if (bit != JC42_ALARM_CRIT_BIT && (data->config & JC42_CFG_CRIT_ONLY))
405		val = 0;
406	return sprintf(buf, "%u\n", (val >> bit) & 1);
407}
408
409static DEVICE_ATTR(temp1_input, S_IRUGO,
410		   show_temp_input, NULL);
411static DEVICE_ATTR(temp1_crit, S_IRUGO,
412		   show_temp_crit, set_temp_crit);
413static DEVICE_ATTR(temp1_min, S_IRUGO,
414		   show_temp_min, set_temp_min);
415static DEVICE_ATTR(temp1_max, S_IRUGO,
416		   show_temp_max, set_temp_max);
417
418static DEVICE_ATTR(temp1_crit_hyst, S_IRUGO,
419		   show_temp_crit_hyst, set_temp_crit_hyst);
420static DEVICE_ATTR(temp1_max_hyst, S_IRUGO,
421		   show_temp_max_hyst, NULL);
422
423static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL,
424			  JC42_ALARM_CRIT_BIT);
425static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL,
426			  JC42_ALARM_MIN_BIT);
427static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL,
428			  JC42_ALARM_MAX_BIT);
429
430static struct attribute *jc42_attributes[] = {
431	&dev_attr_temp1_input.attr,
432	&dev_attr_temp1_crit.attr,
433	&dev_attr_temp1_min.attr,
434	&dev_attr_temp1_max.attr,
435	&dev_attr_temp1_crit_hyst.attr,
436	&dev_attr_temp1_max_hyst.attr,
437	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
438	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
439	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
440	NULL
441};
442
443static mode_t jc42_attribute_mode(struct kobject *kobj,
444				  struct attribute *attr, int index)
445{
446	struct device *dev = container_of(kobj, struct device, kobj);
447	struct i2c_client *client = to_i2c_client(dev);
448	struct jc42_data *data = i2c_get_clientdata(client);
449	unsigned int config = data->config;
450	bool readonly;
451
452	if (attr == &dev_attr_temp1_crit.attr)
453		readonly = config & JC42_CFG_TCRIT_LOCK;
454	else if (attr == &dev_attr_temp1_min.attr ||
455		 attr == &dev_attr_temp1_max.attr)
456		readonly = config & JC42_CFG_EVENT_LOCK;
457	else if (attr == &dev_attr_temp1_crit_hyst.attr)
458		readonly = config & (JC42_CFG_EVENT_LOCK | JC42_CFG_TCRIT_LOCK);
459	else
460		readonly = true;
461
462	return S_IRUGO | (readonly ? 0 : S_IWUSR);
463}
464
465static const struct attribute_group jc42_group = {
466	.attrs = jc42_attributes,
467	.is_visible = jc42_attribute_mode,
468};
469
470/* Return 0 if detection is successful, -ENODEV otherwise */
471static int jc42_detect(struct i2c_client *new_client,
472		       struct i2c_board_info *info)
473{
474	struct i2c_adapter *adapter = new_client->adapter;
475	int i, config, cap, manid, devid;
476
477	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
478				     I2C_FUNC_SMBUS_WORD_DATA))
479		return -ENODEV;
480
481	cap = jc42_read_value(new_client, JC42_REG_CAP);
482	config = jc42_read_value(new_client, JC42_REG_CONFIG);
483	manid = jc42_read_value(new_client, JC42_REG_MANID);
484	devid = jc42_read_value(new_client, JC42_REG_DEVICEID);
485
486	if (cap < 0 || config < 0 || manid < 0 || devid < 0)
487		return -ENODEV;
488
489	if ((cap & 0xff00) || (config & 0xf800))
490		return -ENODEV;
491
492	for (i = 0; i < ARRAY_SIZE(jc42_chips); i++) {
493		struct jc42_chips *chip = &jc42_chips[i];
494		if (manid == chip->manid &&
495		    (devid & chip->devid_mask) == chip->devid) {
496			strlcpy(info->type, "jc42", I2C_NAME_SIZE);
497			return 0;
498		}
499	}
500	return -ENODEV;
501}
502
503static int jc42_probe(struct i2c_client *new_client,
504		      const struct i2c_device_id *id)
505{
506	struct jc42_data *data;
507	int config, cap, err;
508
509	data = kzalloc(sizeof(struct jc42_data), GFP_KERNEL);
510	if (!data) {
511		err = -ENOMEM;
512		goto exit;
513	}
514
515	i2c_set_clientdata(new_client, data);
516	mutex_init(&data->update_lock);
517
518	cap = jc42_read_value(new_client, JC42_REG_CAP);
519	if (cap < 0) {
520		err = -EINVAL;
521		goto exit_free;
522	}
523	data->extended = !!(cap & JC42_CAP_RANGE);
524
525	config = jc42_read_value(new_client, JC42_REG_CONFIG);
526	if (config < 0) {
527		err = -EINVAL;
528		goto exit_free;
529	}
530	data->orig_config = config;
531	if (config & JC42_CFG_SHUTDOWN) {
532		config &= ~JC42_CFG_SHUTDOWN;
533		jc42_write_value(new_client, JC42_REG_CONFIG, config);
534	}
535	data->config = config;
536
537	/* Register sysfs hooks */
538	err = sysfs_create_group(&new_client->dev.kobj, &jc42_group);
539	if (err)
540		goto exit_free;
541
542	data->hwmon_dev = hwmon_device_register(&new_client->dev);
543	if (IS_ERR(data->hwmon_dev)) {
544		err = PTR_ERR(data->hwmon_dev);
545		goto exit_remove;
546	}
547
548	return 0;
549
550exit_remove:
551	sysfs_remove_group(&new_client->dev.kobj, &jc42_group);
552exit_free:
553	kfree(data);
554exit:
555	return err;
556}
557
558static int jc42_remove(struct i2c_client *client)
559{
560	struct jc42_data *data = i2c_get_clientdata(client);
561	hwmon_device_unregister(data->hwmon_dev);
562	sysfs_remove_group(&client->dev.kobj, &jc42_group);
563	if (data->config != data->orig_config)
564		jc42_write_value(client, JC42_REG_CONFIG, data->orig_config);
565	kfree(data);
566	return 0;
567}
568
569/* All registers are word-sized. */
570static int jc42_read_value(struct i2c_client *client, u8 reg)
571{
572	int ret = i2c_smbus_read_word_data(client, reg);
573	if (ret < 0)
574		return ret;
575	return swab16(ret);
576}
577
578static int jc42_write_value(struct i2c_client *client, u8 reg, u16 value)
579{
580	return i2c_smbus_write_word_data(client, reg, swab16(value));
581}
582
583static struct jc42_data *jc42_update_device(struct device *dev)
584{
585	struct i2c_client *client = to_i2c_client(dev);
586	struct jc42_data *data = i2c_get_clientdata(client);
587	struct jc42_data *ret = data;
588	int val;
589
590	mutex_lock(&data->update_lock);
591
592	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
593		val = jc42_read_value(client, JC42_REG_TEMP);
594		if (val < 0) {
595			ret = ERR_PTR(val);
596			goto abort;
597		}
598		data->temp_input = val;
599
600		val = jc42_read_value(client, JC42_REG_TEMP_CRITICAL);
601		if (val < 0) {
602			ret = ERR_PTR(val);
603			goto abort;
604		}
605		data->temp_crit = val;
606
607		val = jc42_read_value(client, JC42_REG_TEMP_LOWER);
608		if (val < 0) {
609			ret = ERR_PTR(val);
610			goto abort;
611		}
612		data->temp_min = val;
613
614		val = jc42_read_value(client, JC42_REG_TEMP_UPPER);
615		if (val < 0) {
616			ret = ERR_PTR(val);
617			goto abort;
618		}
619		data->temp_max = val;
620
621		data->last_updated = jiffies;
622		data->valid = true;
623	}
624abort:
625	mutex_unlock(&data->update_lock);
626	return ret;
627}
628
629static int __init sensors_jc42_init(void)
630{
631	return i2c_add_driver(&jc42_driver);
632}
633
634static void __exit sensors_jc42_exit(void)
635{
636	i2c_del_driver(&jc42_driver);
637}
638
639MODULE_AUTHOR("Guenter Roeck <guenter.roeck@ericsson.com>");
640MODULE_DESCRIPTION("JC42 driver");
641MODULE_LICENSE("GPL");
642
643module_init(sensors_jc42_init);
644module_exit(sensors_jc42_exit);