rtc-rx8025.c revision 5a0e3ad6af8660be21ca98a971cd00f331318c05 
1/*
2 * Driver for Epson's RTC module RX-8025 SA/NB
3 *
4 * Copyright (C) 2009 Wolfgang Grandegger <wg@grandegger.com>
5 *
6 * Copyright (C) 2005 by Digi International Inc.
7 * All rights reserved.
8 *
9 * Modified by fengjh at rising.com.cn
10 * <http://lists.lm-sensors.org/mailman/listinfo/lm-sensors>
11 * 2006.11
12 *
13 * Code cleanup by Sergei Poselenov, <sposelenov@emcraft.com>
14 * Converted to new style by Wolfgang Grandegger <wg@grandegger.com>
15 * Alarm and periodic interrupt added by Dmitry Rakhchev <rda@emcraft.com>
16 *
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License
19 * version 2 as published by the Free Software Foundation.
20 */
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/slab.h>
24#include <linux/init.h>
25#include <linux/bcd.h>
26#include <linux/i2c.h>
27#include <linux/list.h>
28#include <linux/rtc.h>
29
30/* Register definitions */
31#define RX8025_REG_SEC		0x00
32#define RX8025_REG_MIN		0x01
33#define RX8025_REG_HOUR		0x02
34#define RX8025_REG_WDAY		0x03
35#define RX8025_REG_MDAY		0x04
36#define RX8025_REG_MONTH	0x05
37#define RX8025_REG_YEAR		0x06
38#define RX8025_REG_DIGOFF	0x07
39#define RX8025_REG_ALWMIN	0x08
40#define RX8025_REG_ALWHOUR	0x09
41#define RX8025_REG_ALWWDAY	0x0a
42#define RX8025_REG_ALDMIN	0x0b
43#define RX8025_REG_ALDHOUR	0x0c
44/* 0x0d is reserved */
45#define RX8025_REG_CTRL1	0x0e
46#define RX8025_REG_CTRL2	0x0f
47
48#define RX8025_BIT_CTRL1_CT	(7 << 0)
49/* 1 Hz periodic level irq */
50#define RX8025_BIT_CTRL1_CT_1HZ	4
51#define RX8025_BIT_CTRL1_TEST	(1 << 3)
52#define RX8025_BIT_CTRL1_1224	(1 << 5)
53#define RX8025_BIT_CTRL1_DALE	(1 << 6)
54#define RX8025_BIT_CTRL1_WALE	(1 << 7)
55
56#define RX8025_BIT_CTRL2_DAFG	(1 << 0)
57#define RX8025_BIT_CTRL2_WAFG	(1 << 1)
58#define RX8025_BIT_CTRL2_CTFG	(1 << 2)
59#define RX8025_BIT_CTRL2_PON	(1 << 4)
60#define RX8025_BIT_CTRL2_XST	(1 << 5)
61#define RX8025_BIT_CTRL2_VDET	(1 << 6)
62
63/* Clock precision adjustment */
64#define RX8025_ADJ_RESOLUTION	3050 /* in ppb */
65#define RX8025_ADJ_DATA_MAX	62
66#define RX8025_ADJ_DATA_MIN	-62
67
68static const struct i2c_device_id rx8025_id[] = {
69	{ "rx8025", 0 },
70	{ }
71};
72MODULE_DEVICE_TABLE(i2c, rx8025_id);
73
74struct rx8025_data {
75	struct i2c_client *client;
76	struct rtc_device *rtc;
77	struct work_struct work;
78	u8 ctrl1;
79	unsigned exiting:1;
80};
81
82static int rx8025_read_reg(struct i2c_client *client, int number, u8 *value)
83{
84	int ret = i2c_smbus_read_byte_data(client, (number << 4) | 0x08);
85
86	if (ret < 0) {
87		dev_err(&client->dev, "Unable to read register #%d\n", number);
88		return ret;
89	}
90
91	*value = ret;
92	return 0;
93}
94
95static int rx8025_read_regs(struct i2c_client *client,
96			    int number, u8 length, u8 *values)
97{
98	int ret = i2c_smbus_read_i2c_block_data(client, (number << 4) | 0x08,
99						length, values);
100
101	if (ret != length) {
102		dev_err(&client->dev, "Unable to read registers #%d..#%d\n",
103			number, number + length - 1);
104		return ret < 0 ? ret : -EIO;
105	}
106
107	return 0;
108}
109
110static int rx8025_write_reg(struct i2c_client *client, int number, u8 value)
111{
112	int ret = i2c_smbus_write_byte_data(client, number << 4, value);
113
114	if (ret)
115		dev_err(&client->dev, "Unable to write register #%d\n",
116			number);
117
118	return ret;
119}
120
121static int rx8025_write_regs(struct i2c_client *client,
122			     int number, u8 length, u8 *values)
123{
124	int ret = i2c_smbus_write_i2c_block_data(client, (number << 4) | 0x08,
125						 length, values);
126
127	if (ret)
128		dev_err(&client->dev, "Unable to write registers #%d..#%d\n",
129			number, number + length - 1);
130
131	return ret;
132}
133
134static irqreturn_t rx8025_irq(int irq, void *dev_id)
135{
136	struct i2c_client *client = dev_id;
137	struct rx8025_data *rx8025 = i2c_get_clientdata(client);
138
139	disable_irq_nosync(irq);
140	schedule_work(&rx8025->work);
141	return IRQ_HANDLED;
142}
143
144static void rx8025_work(struct work_struct *work)
145{
146	struct rx8025_data *rx8025 = container_of(work, struct rx8025_data,
147						  work);
148	struct i2c_client *client = rx8025->client;
149	struct mutex *lock = &rx8025->rtc->ops_lock;
150	u8 status;
151
152	mutex_lock(lock);
153
154	if (rx8025_read_reg(client, RX8025_REG_CTRL2, &status))
155		goto out;
156
157	if (!(status & RX8025_BIT_CTRL2_XST))
158		dev_warn(&client->dev, "Oscillation stop was detected,"
159			 "you may have to readjust the clock\n");
160
161	if (status & RX8025_BIT_CTRL2_CTFG) {
162		/* periodic */
163		status &= ~RX8025_BIT_CTRL2_CTFG;
164		local_irq_disable();
165		rtc_update_irq(rx8025->rtc, 1, RTC_PF | RTC_IRQF);
166		local_irq_enable();
167	}
168
169	if (status & RX8025_BIT_CTRL2_DAFG) {
170		/* alarm */
171		status &= RX8025_BIT_CTRL2_DAFG;
172		if (rx8025_write_reg(client, RX8025_REG_CTRL1,
173				     rx8025->ctrl1 & ~RX8025_BIT_CTRL1_DALE))
174			goto out;
175		local_irq_disable();
176		rtc_update_irq(rx8025->rtc, 1, RTC_AF | RTC_IRQF);
177		local_irq_enable();
178	}
179
180	/* acknowledge IRQ */
181	rx8025_write_reg(client, RX8025_REG_CTRL2,
182			 status | RX8025_BIT_CTRL2_XST);
183
184out:
185	if (!rx8025->exiting)
186		enable_irq(client->irq);
187
188	mutex_unlock(lock);
189}
190
191static int rx8025_get_time(struct device *dev, struct rtc_time *dt)
192{
193	struct rx8025_data *rx8025 = dev_get_drvdata(dev);
194	u8 date[7];
195	int err;
196
197	err = rx8025_read_regs(rx8025->client, RX8025_REG_SEC, 7, date);
198	if (err)
199		return err;
200
201	dev_dbg(dev, "%s: read 0x%02x 0x%02x "
202		"0x%02x 0x%02x 0x%02x 0x%02x 0x%02x\n", __func__,
203		date[0], date[1], date[2], date[3], date[4],
204		date[5], date[6]);
205
206	dt->tm_sec = bcd2bin(date[RX8025_REG_SEC] & 0x7f);
207	dt->tm_min = bcd2bin(date[RX8025_REG_MIN] & 0x7f);
208	if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224)
209		dt->tm_hour = bcd2bin(date[RX8025_REG_HOUR] & 0x3f);
210	else
211		dt->tm_hour = bcd2bin(date[RX8025_REG_HOUR] & 0x1f) % 12
212			+ (date[RX8025_REG_HOUR] & 0x20 ? 12 : 0);
213
214	dt->tm_mday = bcd2bin(date[RX8025_REG_MDAY] & 0x3f);
215	dt->tm_mon = bcd2bin(date[RX8025_REG_MONTH] & 0x1f) - 1;
216	dt->tm_year = bcd2bin(date[RX8025_REG_YEAR]);
217
218	if (dt->tm_year < 70)
219		dt->tm_year += 100;
220
221	dev_dbg(dev, "%s: date %ds %dm %dh %dmd %dm %dy\n", __func__,
222		dt->tm_sec, dt->tm_min, dt->tm_hour,
223		dt->tm_mday, dt->tm_mon, dt->tm_year);
224
225	return rtc_valid_tm(dt);
226}
227
228static int rx8025_set_time(struct device *dev, struct rtc_time *dt)
229{
230	struct rx8025_data *rx8025 = dev_get_drvdata(dev);
231	u8 date[7];
232
233	/*
234	 * BUG: The HW assumes every year that is a multiple of 4 to be a leap
235	 * year.  Next time this is wrong is 2100, which will not be a leap
236	 * year.
237	 */
238
239	/*
240	 * Here the read-only bits are written as "0".  I'm not sure if that
241	 * is sound.
242	 */
243	date[RX8025_REG_SEC] = bin2bcd(dt->tm_sec);
244	date[RX8025_REG_MIN] = bin2bcd(dt->tm_min);
245	if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224)
246		date[RX8025_REG_HOUR] = bin2bcd(dt->tm_hour);
247	else
248		date[RX8025_REG_HOUR] = (dt->tm_hour >= 12 ? 0x20 : 0)
249			| bin2bcd((dt->tm_hour + 11) % 12 + 1);
250
251	date[RX8025_REG_WDAY] = bin2bcd(dt->tm_wday);
252	date[RX8025_REG_MDAY] = bin2bcd(dt->tm_mday);
253	date[RX8025_REG_MONTH] = bin2bcd(dt->tm_mon + 1);
254	date[RX8025_REG_YEAR] = bin2bcd(dt->tm_year % 100);
255
256	dev_dbg(dev,
257		"%s: write 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x\n",
258		__func__,
259		date[0], date[1], date[2], date[3], date[4], date[5], date[6]);
260
261	return rx8025_write_regs(rx8025->client, RX8025_REG_SEC, 7, date);
262}
263
264static int rx8025_init_client(struct i2c_client *client, int *need_reset)
265{
266	struct rx8025_data *rx8025 = i2c_get_clientdata(client);
267	u8 ctrl[2], ctrl2;
268	int need_clear = 0;
269	int err;
270
271	err = rx8025_read_regs(rx8025->client, RX8025_REG_CTRL1, 2, ctrl);
272	if (err)
273		goto out;
274
275	/* Keep test bit zero ! */
276	rx8025->ctrl1 = ctrl[0] & ~RX8025_BIT_CTRL1_TEST;
277
278	if (ctrl[1] & RX8025_BIT_CTRL2_PON) {
279		dev_warn(&client->dev, "power-on reset was detected, "
280			 "you may have to readjust the clock\n");
281		*need_reset = 1;
282	}
283
284	if (ctrl[1] & RX8025_BIT_CTRL2_VDET) {
285		dev_warn(&client->dev, "a power voltage drop was detected, "
286			 "you may have to readjust the clock\n");
287		*need_reset = 1;
288	}
289
290	if (!(ctrl[1] & RX8025_BIT_CTRL2_XST)) {
291		dev_warn(&client->dev, "Oscillation stop was detected,"
292			 "you may have to readjust the clock\n");
293		*need_reset = 1;
294	}
295
296	if (ctrl[1] & (RX8025_BIT_CTRL2_DAFG | RX8025_BIT_CTRL2_WAFG)) {
297		dev_warn(&client->dev, "Alarm was detected\n");
298		need_clear = 1;
299	}
300
301	if (!(ctrl[1] & RX8025_BIT_CTRL2_CTFG))
302		need_clear = 1;
303
304	if (*need_reset || need_clear) {
305		ctrl2 = ctrl[0];
306		ctrl2 &= ~(RX8025_BIT_CTRL2_PON | RX8025_BIT_CTRL2_VDET |
307			   RX8025_BIT_CTRL2_CTFG | RX8025_BIT_CTRL2_WAFG |
308			   RX8025_BIT_CTRL2_DAFG);
309		ctrl2 |= RX8025_BIT_CTRL2_XST;
310
311		err = rx8025_write_reg(client, RX8025_REG_CTRL2, ctrl2);
312	}
313out:
314	return err;
315}
316
317/* Alarm support */
318static int rx8025_read_alarm(struct device *dev, struct rtc_wkalrm *t)
319{
320	struct rx8025_data *rx8025 = dev_get_drvdata(dev);
321	struct i2c_client *client = rx8025->client;
322	u8 ctrl2, ald[2];
323	int err;
324
325	if (client->irq <= 0)
326		return -EINVAL;
327
328	err = rx8025_read_regs(client, RX8025_REG_ALDMIN, 2, ald);
329	if (err)
330		return err;
331
332	err = rx8025_read_reg(client, RX8025_REG_CTRL2, &ctrl2);
333	if (err)
334		return err;
335
336	dev_dbg(dev, "%s: read alarm 0x%02x 0x%02x ctrl2 %02x\n",
337		__func__, ald[0], ald[1], ctrl2);
338
339	/* Hardware alarms precision is 1 minute! */
340	t->time.tm_sec = 0;
341	t->time.tm_min = bcd2bin(ald[0] & 0x7f);
342	if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224)
343		t->time.tm_hour = bcd2bin(ald[1] & 0x3f);
344	else
345		t->time.tm_hour = bcd2bin(ald[1] & 0x1f) % 12
346			+ (ald[1] & 0x20 ? 12 : 0);
347
348	t->time.tm_wday = -1;
349	t->time.tm_mday = -1;
350	t->time.tm_mon = -1;
351	t->time.tm_year = -1;
352
353	dev_dbg(dev, "%s: date: %ds %dm %dh %dmd %dm %dy\n",
354		__func__,
355		t->time.tm_sec, t->time.tm_min, t->time.tm_hour,
356		t->time.tm_mday, t->time.tm_mon, t->time.tm_year);
357	t->enabled = !!(rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE);
358	t->pending = (ctrl2 & RX8025_BIT_CTRL2_DAFG) && t->enabled;
359
360	return err;
361}
362
363static int rx8025_set_alarm(struct device *dev, struct rtc_wkalrm *t)
364{
365	struct i2c_client *client = to_i2c_client(dev);
366	struct rx8025_data *rx8025 = dev_get_drvdata(dev);
367	u8 ald[2];
368	int err;
369
370	if (client->irq <= 0)
371		return -EINVAL;
372
373	/* Hardware alarm precision is 1 minute! */
374	ald[0] = bin2bcd(t->time.tm_min);
375	if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224)
376		ald[1] = bin2bcd(t->time.tm_hour);
377	else
378		ald[1] = (t->time.tm_hour >= 12 ? 0x20 : 0)
379			| bin2bcd((t->time.tm_hour + 11) % 12 + 1);
380
381	dev_dbg(dev, "%s: write 0x%02x 0x%02x\n", __func__, ald[0], ald[1]);
382
383	if (rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE) {
384		rx8025->ctrl1 &= ~RX8025_BIT_CTRL1_DALE;
385		err = rx8025_write_reg(rx8025->client, RX8025_REG_CTRL1,
386				       rx8025->ctrl1);
387		if (err)
388			return err;
389	}
390	err = rx8025_write_regs(rx8025->client, RX8025_REG_ALDMIN, 2, ald);
391	if (err)
392		return err;
393
394	if (t->enabled) {
395		rx8025->ctrl1 |= RX8025_BIT_CTRL1_DALE;
396		err = rx8025_write_reg(rx8025->client, RX8025_REG_CTRL1,
397				       rx8025->ctrl1);
398		if (err)
399			return err;
400	}
401
402	return 0;
403}
404
405static int rx8025_alarm_irq_enable(struct device *dev, unsigned int enabled)
406{
407	struct rx8025_data *rx8025 = dev_get_drvdata(dev);
408	u8 ctrl1;
409	int err;
410
411	ctrl1 = rx8025->ctrl1;
412	if (enabled)
413		ctrl1 |= RX8025_BIT_CTRL1_DALE;
414	else
415		ctrl1 &= ~RX8025_BIT_CTRL1_DALE;
416
417	if (ctrl1 != rx8025->ctrl1) {
418		rx8025->ctrl1 = ctrl1;
419		err = rx8025_write_reg(rx8025->client, RX8025_REG_CTRL1,
420				       rx8025->ctrl1);
421		if (err)
422			return err;
423	}
424	return 0;
425}
426
427static int rx8025_irq_set_state(struct device *dev, int enabled)
428{
429	struct i2c_client *client = to_i2c_client(dev);
430	struct rx8025_data *rx8025 = i2c_get_clientdata(client);
431	int ctrl1;
432	int err;
433
434	if (client->irq <= 0)
435		return -ENXIO;
436
437	ctrl1 = rx8025->ctrl1 & ~RX8025_BIT_CTRL1_CT;
438	if (enabled)
439		ctrl1 |= RX8025_BIT_CTRL1_CT_1HZ;
440	if (ctrl1 != rx8025->ctrl1) {
441		rx8025->ctrl1 = ctrl1;
442		err = rx8025_write_reg(rx8025->client, RX8025_REG_CTRL1,
443				       rx8025->ctrl1);
444		if (err)
445			return err;
446	}
447
448	return 0;
449}
450
451static struct rtc_class_ops rx8025_rtc_ops = {
452	.read_time = rx8025_get_time,
453	.set_time = rx8025_set_time,
454	.read_alarm = rx8025_read_alarm,
455	.set_alarm = rx8025_set_alarm,
456	.alarm_irq_enable = rx8025_alarm_irq_enable,
457	.irq_set_state  = rx8025_irq_set_state,
458};
459
460/*
461 * Clock precision adjustment support
462 *
463 * According to the RX8025 SA/NB application manual the frequency and
464 * temperature charateristics can be approximated using the following
465 * equation:
466 *
467 *   df = a * (ut - t)**2
468 *
469 *   df: Frequency deviation in any temperature
470 *   a : Coefficient = (-35 +-5) * 10**-9
471 *   ut: Ultimate temperature in degree = +25 +-5 degree
472 *   t : Any temperature in degree
473 *
474 * Note that the clock adjustment in ppb must be entered (which is
475 * the negative value of the deviation).
476 */
477static int rx8025_get_clock_adjust(struct device *dev, int *adj)
478{
479	struct i2c_client *client = to_i2c_client(dev);
480	u8 digoff;
481	int err;
482
483	err = rx8025_read_reg(client, RX8025_REG_DIGOFF, &digoff);
484	if (err)
485		return err;
486
487	*adj = digoff >= 64 ? digoff - 128 : digoff;
488	if (*adj > 0)
489		(*adj)--;
490	*adj *= -RX8025_ADJ_RESOLUTION;
491
492	return 0;
493}
494
495static int rx8025_set_clock_adjust(struct device *dev, int adj)
496{
497	struct i2c_client *client = to_i2c_client(dev);
498	u8 digoff;
499	int err;
500
501	adj /= -RX8025_ADJ_RESOLUTION;
502	if (adj > RX8025_ADJ_DATA_MAX)
503		adj = RX8025_ADJ_DATA_MAX;
504	else if (adj < RX8025_ADJ_DATA_MIN)
505		adj = RX8025_ADJ_DATA_MIN;
506	else if (adj > 0)
507		adj++;
508	else if (adj < 0)
509		adj += 128;
510	digoff = adj;
511
512	err = rx8025_write_reg(client, RX8025_REG_DIGOFF, digoff);
513	if (err)
514		return err;
515
516	dev_dbg(dev, "%s: write 0x%02x\n", __func__, digoff);
517
518	return 0;
519}
520
521static ssize_t rx8025_sysfs_show_clock_adjust(struct device *dev,
522					      struct device_attribute *attr,
523					      char *buf)
524{
525	int err, adj;
526
527	err = rx8025_get_clock_adjust(dev, &adj);
528	if (err)
529		return err;
530
531	return sprintf(buf, "%d\n", adj);
532}
533
534static ssize_t rx8025_sysfs_store_clock_adjust(struct device *dev,
535					       struct device_attribute *attr,
536					       const char *buf, size_t count)
537{
538	int adj, err;
539
540	if (sscanf(buf, "%i", &adj) != 1)
541		return -EINVAL;
542
543	err = rx8025_set_clock_adjust(dev, adj);
544
545	return err ? err : count;
546}
547
548static DEVICE_ATTR(clock_adjust_ppb, S_IRUGO | S_IWUSR,
549		   rx8025_sysfs_show_clock_adjust,
550		   rx8025_sysfs_store_clock_adjust);
551
552static int rx8025_sysfs_register(struct device *dev)
553{
554	return device_create_file(dev, &dev_attr_clock_adjust_ppb);
555}
556
557static void rx8025_sysfs_unregister(struct device *dev)
558{
559	device_remove_file(dev, &dev_attr_clock_adjust_ppb);
560}
561
562static int __devinit rx8025_probe(struct i2c_client *client,
563				  const struct i2c_device_id *id)
564{
565	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
566	struct rx8025_data *rx8025;
567	int err, need_reset = 0;
568
569	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
570				     | I2C_FUNC_SMBUS_I2C_BLOCK)) {
571		dev_err(&adapter->dev,
572			"doesn't support required functionality\n");
573		err = -EIO;
574		goto errout;
575	}
576
577	rx8025 = kzalloc(sizeof(*rx8025), GFP_KERNEL);
578	if (!rx8025) {
579		dev_err(&adapter->dev, "failed to alloc memory\n");
580		err = -ENOMEM;
581		goto errout;
582	}
583
584	rx8025->client = client;
585	i2c_set_clientdata(client, rx8025);
586	INIT_WORK(&rx8025->work, rx8025_work);
587
588	err = rx8025_init_client(client, &need_reset);
589	if (err)
590		goto errout_free;
591
592	if (need_reset) {
593		struct rtc_time tm;
594		dev_info(&client->dev,
595			 "bad conditions detected, resetting date\n");
596		rtc_time_to_tm(0, &tm);	/* 1970/1/1 */
597		rx8025_set_time(&client->dev, &tm);
598	}
599
600	rx8025->rtc = rtc_device_register(client->name, &client->dev,
601					  &rx8025_rtc_ops, THIS_MODULE);
602	if (IS_ERR(rx8025->rtc)) {
603		err = PTR_ERR(rx8025->rtc);
604		dev_err(&client->dev, "unable to register the class device\n");
605		goto errout_free;
606	}
607
608	if (client->irq > 0) {
609		dev_info(&client->dev, "IRQ %d supplied\n", client->irq);
610		err = request_irq(client->irq, rx8025_irq,
611				  0, "rx8025", client);
612		if (err) {
613			dev_err(&client->dev, "unable to request IRQ\n");
614			goto errout_reg;
615		}
616	}
617
618	rx8025->rtc->irq_freq = 1;
619	rx8025->rtc->max_user_freq = 1;
620
621	err = rx8025_sysfs_register(&client->dev);
622	if (err)
623		goto errout_irq;
624
625	return 0;
626
627errout_irq:
628	if (client->irq > 0)
629		free_irq(client->irq, client);
630
631errout_reg:
632	rtc_device_unregister(rx8025->rtc);
633
634errout_free:
635	i2c_set_clientdata(client, NULL);
636	kfree(rx8025);
637
638errout:
639	dev_err(&adapter->dev, "probing for rx8025 failed\n");
640	return err;
641}
642
643static int __devexit rx8025_remove(struct i2c_client *client)
644{
645	struct rx8025_data *rx8025 = i2c_get_clientdata(client);
646	struct mutex *lock = &rx8025->rtc->ops_lock;
647
648	if (client->irq > 0) {
649		mutex_lock(lock);
650		rx8025->exiting = 1;
651		mutex_unlock(lock);
652
653		free_irq(client->irq, client);
654		flush_scheduled_work();
655	}
656
657	rx8025_sysfs_unregister(&client->dev);
658	rtc_device_unregister(rx8025->rtc);
659	i2c_set_clientdata(client, NULL);
660	kfree(rx8025);
661	return 0;
662}
663
664static struct i2c_driver rx8025_driver = {
665	.driver = {
666		.name = "rtc-rx8025",
667		.owner = THIS_MODULE,
668	},
669	.probe		= rx8025_probe,
670	.remove		= __devexit_p(rx8025_remove),
671	.id_table	= rx8025_id,
672};
673
674static int __init rx8025_init(void)
675{
676	return i2c_add_driver(&rx8025_driver);
677}
678
679static void __exit rx8025_exit(void)
680{
681	i2c_del_driver(&rx8025_driver);
682}
683
684MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
685MODULE_DESCRIPTION("RX-8025 SA/NB RTC driver");
686MODULE_LICENSE("GPL");
687
688module_init(rx8025_init);
689module_exit(rx8025_exit);
690