aboutsummaryrefslogblamecommitdiffstats
path: root/drivers/rtc/rtc-rx8025.c
blob: 1146e3522d3cdc82b512fc751e4ac6adf03c0440 (plain) (tree)
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463





















                                                                          
                       























































































































































































































































































































































































































































                                                                               
                                                                      









































































































































































                                                                               






















                                                                





























                                                         
/*
 * Driver for Epson's RTC module RX-8025 SA/NB
 *
 * Copyright (C) 2009 Wolfgang Grandegger <wg@grandegger.com>
 *
 * Copyright (C) 2005 by Digi International Inc.
 * All rights reserved.
 *
 * Modified by fengjh at rising.com.cn
 * <http://lists.lm-sensors.org/mailman/listinfo/lm-sensors>
 * 2006.11
 *
 * Code cleanup by Sergei Poselenov, <sposelenov@emcraft.com>
 * Converted to new style by Wolfgang Grandegger <wg@grandegger.com>
 * Alarm and periodic interrupt added by Dmitry Rakhchev <rda@emcraft.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/bcd.h>
#include <linux/i2c.h>
#include <linux/list.h>
#include <linux/rtc.h>

/* Register definitions */
#define RX8025_REG_SEC		0x00
#define RX8025_REG_MIN		0x01
#define RX8025_REG_HOUR		0x02
#define RX8025_REG_WDAY		0x03
#define RX8025_REG_MDAY		0x04
#define RX8025_REG_MONTH	0x05
#define RX8025_REG_YEAR		0x06
#define RX8025_REG_DIGOFF	0x07
#define RX8025_REG_ALWMIN	0x08
#define RX8025_REG_ALWHOUR	0x09
#define RX8025_REG_ALWWDAY	0x0a
#define RX8025_REG_ALDMIN	0x0b
#define RX8025_REG_ALDHOUR	0x0c
/* 0x0d is reserved */
#define RX8025_REG_CTRL1	0x0e
#define RX8025_REG_CTRL2	0x0f

#define RX8025_BIT_CTRL1_CT	(7 << 0)
/* 1 Hz periodic level irq */
#define RX8025_BIT_CTRL1_CT_1HZ	4
#define RX8025_BIT_CTRL1_TEST	(1 << 3)
#define RX8025_BIT_CTRL1_1224	(1 << 5)
#define RX8025_BIT_CTRL1_DALE	(1 << 6)
#define RX8025_BIT_CTRL1_WALE	(1 << 7)

#define RX8025_BIT_CTRL2_DAFG	(1 << 0)
#define RX8025_BIT_CTRL2_WAFG	(1 << 1)
#define RX8025_BIT_CTRL2_CTFG	(1 << 2)
#define RX8025_BIT_CTRL2_PON	(1 << 4)
#define RX8025_BIT_CTRL2_XST	(1 << 5)
#define RX8025_BIT_CTRL2_VDET	(1 << 6)

/* Clock precision adjustment */
#define RX8025_ADJ_RESOLUTION	3050 /* in ppb */
#define RX8025_ADJ_DATA_MAX	62
#define RX8025_ADJ_DATA_MIN	-62

static const struct i2c_device_id rx8025_id[] = {
	{ "rx8025", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, rx8025_id);

struct rx8025_data {
	struct i2c_client *client;
	struct rtc_device *rtc;
	struct work_struct work;
	u8 ctrl1;
	unsigned exiting:1;
};

static int rx8025_read_reg(struct i2c_client *client, int number, u8 *value)
{
	int ret = i2c_smbus_read_byte_data(client, (number << 4) | 0x08);

	if (ret < 0) {
		dev_err(&client->dev, "Unable to read register #%d\n", number);
		return ret;
	}

	*value = ret;
	return 0;
}

static int rx8025_read_regs(struct i2c_client *client,
			    int number, u8 length, u8 *values)
{
	int ret = i2c_smbus_read_i2c_block_data(client, (number << 4) | 0x08,
						length, values);

	if (ret != length) {
		dev_err(&client->dev, "Unable to read registers #%d..#%d\n",
			number, number + length - 1);
		return ret < 0 ? ret : -EIO;
	}

	return 0;
}

static int rx8025_write_reg(struct i2c_client *client, int number, u8 value)
{
	int ret = i2c_smbus_write_byte_data(client, number << 4, value);

	if (ret)
		dev_err(&client->dev, "Unable to write register #%d\n",
			number);

	return ret;
}

static int rx8025_write_regs(struct i2c_client *client,
			     int number, u8 length, u8 *values)
{
	int ret = i2c_smbus_write_i2c_block_data(client, (number << 4) | 0x08,
						 length, values);

	if (ret)
		dev_err(&client->dev, "Unable to write registers #%d..#%d\n",
			number, number + length - 1);

	return ret;
}

static irqreturn_t rx8025_irq(int irq, void *dev_id)
{
	struct i2c_client *client = dev_id;
	struct rx8025_data *rx8025 = i2c_get_clientdata(client);

	disable_irq_nosync(irq);
	schedule_work(&rx8025->work);
	return IRQ_HANDLED;
}

static void rx8025_work(struct work_struct *work)
{
	struct rx8025_data *rx8025 = container_of(work, struct rx8025_data,
						  work);
	struct i2c_client *client = rx8025->client;
	struct mutex *lock = &rx8025->rtc->ops_lock;
	u8 status;

	mutex_lock(lock);

	if (rx8025_read_reg(client, RX8025_REG_CTRL2, &status))
		goto out;

	if (!(status & RX8025_BIT_CTRL2_XST))
		dev_warn(&client->dev, "Oscillation stop was detected,"
			 "you may have to readjust the clock\n");

	if (status & RX8025_BIT_CTRL2_CTFG) {
		/* periodic */
		status &= ~RX8025_BIT_CTRL2_CTFG;
		local_irq_disable();
		rtc_update_irq(rx8025->rtc, 1, RTC_PF | RTC_IRQF);
		local_irq_enable();
	}

	if (status & RX8025_BIT_CTRL2_DAFG) {
		/* alarm */
		status &= RX8025_BIT_CTRL2_DAFG;
		if (rx8025_write_reg(client, RX8025_REG_CTRL1,
				     rx8025->ctrl1 & ~RX8025_BIT_CTRL1_DALE))
			goto out;
		local_irq_disable();
		rtc_update_irq(rx8025->rtc, 1, RTC_AF | RTC_IRQF);
		local_irq_enable();
	}

	/* acknowledge IRQ */
	rx8025_write_reg(client, RX8025_REG_CTRL2,
			 status | RX8025_BIT_CTRL2_XST);

out:
	if (!rx8025->exiting)
		enable_irq(client->irq);

	mutex_unlock(lock);
}

static int rx8025_get_time(struct device *dev, struct rtc_time *dt)
{
	struct rx8025_data *rx8025 = dev_get_drvdata(dev);
	u8 date[7];
	int err;

	err = rx8025_read_regs(rx8025->client, RX8025_REG_SEC, 7, date);
	if (err)
		return err;

	dev_dbg(dev, "%s: read 0x%02x 0x%02x "
		"0x%02x 0x%02x 0x%02x 0x%02x 0x%02x\n", __func__,
		date[0], date[1], date[2], date[3], date[4],
		date[5], date[6]);

	dt->tm_sec = bcd2bin(date[RX8025_REG_SEC] & 0x7f);
	dt->tm_min = bcd2bin(date[RX8025_REG_MIN] & 0x7f);
	if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224)
		dt->tm_hour = bcd2bin(date[RX8025_REG_HOUR] & 0x3f);
	else
		dt->tm_hour = bcd2bin(date[RX8025_REG_HOUR] & 0x1f) % 12
			+ (date[RX8025_REG_HOUR] & 0x20 ? 12 : 0);

	dt->tm_mday = bcd2bin(date[RX8025_REG_MDAY] & 0x3f);
	dt->tm_mon = bcd2bin(date[RX8025_REG_MONTH] & 0x1f) - 1;
	dt->tm_year = bcd2bin(date[RX8025_REG_YEAR]);

	if (dt->tm_year < 70)
		dt->tm_year += 100;

	dev_dbg(dev, "%s: date %ds %dm %dh %dmd %dm %dy\n", __func__,
		dt->tm_sec, dt->tm_min, dt->tm_hour,
		dt->tm_mday, dt->tm_mon, dt->tm_year);

	return rtc_valid_tm(dt);
}

static int rx8025_set_time(struct device *dev, struct rtc_time *dt)
{
	struct rx8025_data *rx8025 = dev_get_drvdata(dev);
	u8 date[7];

	/*
	 * BUG: The HW assumes every year that is a multiple of 4 to be a leap
	 * year.  Next time this is wrong is 2100, which will not be a leap
	 * year.
	 */

	/*
	 * Here the read-only bits are written as "0".  I'm not sure if that
	 * is sound.
	 */
	date[RX8025_REG_SEC] = bin2bcd(dt->tm_sec);
	date[RX8025_REG_MIN] = bin2bcd(dt->tm_min);
	if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224)
		date[RX8025_REG_HOUR] = bin2bcd(dt->tm_hour);
	else
		date[RX8025_REG_HOUR] = (dt->tm_hour >= 12 ? 0x20 : 0)
			| bin2bcd((dt->tm_hour + 11) % 12 + 1);

	date[RX8025_REG_WDAY] = bin2bcd(dt->tm_wday);
	date[RX8025_REG_MDAY] = bin2bcd(dt->tm_mday);
	date[RX8025_REG_MONTH] = bin2bcd(dt->tm_mon + 1);
	date[RX8025_REG_YEAR] = bin2bcd(dt->tm_year % 100);

	dev_dbg(dev,
		"%s: write 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x\n",
		__func__,
		date[0], date[1], date[2], date[3], date[4], date[5], date[6]);

	return rx8025_write_regs(rx8025->client, RX8025_REG_SEC, 7, date);
}

static int rx8025_init_client(struct i2c_client *client, int *need_reset)
{
	struct rx8025_data *rx8025 = i2c_get_clientdata(client);
	u8 ctrl[2], ctrl2;
	int need_clear = 0;
	int err;

	err = rx8025_read_regs(rx8025->client, RX8025_REG_CTRL1, 2, ctrl);
	if (err)
		goto out;

	/* Keep test bit zero ! */
	rx8025->ctrl1 = ctrl[0] & ~RX8025_BIT_CTRL1_TEST;

	if (ctrl[1] & RX8025_BIT_CTRL2_PON) {
		dev_warn(&client->dev, "power-on reset was detected, "
			 "you may have to readjust the clock\n");
		*need_reset = 1;
	}

	if (ctrl[1] & RX8025_BIT_CTRL2_VDET) {
		dev_warn(&client->dev, "a power voltage drop was detected, "
			 "you may have to readjust the clock\n");
		*need_reset = 1;
	}

	if (!(ctrl[1] & RX8025_BIT_CTRL2_XST)) {
		dev_warn(&client->dev, "Oscillation stop was detected,"
			 "you may have to readjust the clock\n");
		*need_reset = 1;
	}

	if (ctrl[1] & (RX8025_BIT_CTRL2_DAFG | RX8025_BIT_CTRL2_WAFG)) {
		dev_warn(&client->dev, "Alarm was detected\n");
		need_clear = 1;
	}

	if (!(ctrl[1] & RX8025_BIT_CTRL2_CTFG))
		need_clear = 1;

	if (*need_reset || need_clear) {
		ctrl2 = ctrl[0];
		ctrl2 &= ~(RX8025_BIT_CTRL2_PON | RX8025_BIT_CTRL2_VDET |
			   RX8025_BIT_CTRL2_CTFG | RX8025_BIT_CTRL2_WAFG |
			   RX8025_BIT_CTRL2_DAFG);
		ctrl2 |= RX8025_BIT_CTRL2_XST;

		err = rx8025_write_reg(client, RX8025_REG_CTRL2, ctrl2);
	}
out:
	return err;
}

/* Alarm support */
static int rx8025_read_alarm(struct device *dev, struct rtc_wkalrm *t)
{
	struct rx8025_data *rx8025 = dev_get_drvdata(dev);
	struct i2c_client *client = rx8025->client;
	u8 ctrl2, ald[2];
	int err;

	if (client->irq <= 0)
		return -EINVAL;

	err = rx8025_read_regs(client, RX8025_REG_ALDMIN, 2, ald);
	if (err)
		return err;

	err = rx8025_read_reg(client, RX8025_REG_CTRL2, &ctrl2);
	if (err)
		return err;

	dev_dbg(dev, "%s: read alarm 0x%02x 0x%02x ctrl2 %02x\n",
		__func__, ald[0], ald[1], ctrl2);

	/* Hardware alarms precision is 1 minute! */
	t->time.tm_sec = 0;
	t->time.tm_min = bcd2bin(ald[0] & 0x7f);
	if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224)
		t->time.tm_hour = bcd2bin(ald[1] & 0x3f);
	else
		t->time.tm_hour = bcd2bin(ald[1] & 0x1f) % 12
			+ (ald[1] & 0x20 ? 12 : 0);

	t->time.tm_wday = -1;
	t->time.tm_mday = -1;
	t->time.tm_mon = -1;
	t->time.tm_year = -1;

	dev_dbg(dev, "%s: date: %ds %dm %dh %dmd %dm %dy\n",
		__func__,
		t->time.tm_sec, t->time.tm_min, t->time.tm_hour,
		t->time.tm_mday, t->time.tm_mon, t->time.tm_year);
	t->enabled = !!(rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE);
	t->pending = (ctrl2 & RX8025_BIT_CTRL2_DAFG) && t->enabled;

	return err;
}

static int rx8025_set_alarm(struct device *dev, struct rtc_wkalrm *t)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct rx8025_data *rx8025 = dev_get_drvdata(dev);
	u8 ald[2];
	int err;

	if (client->irq <= 0)
		return -EINVAL;

	/* Hardware alarm precision is 1 minute! */
	ald[0] = bin2bcd(t->time.tm_min);
	if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224)
		ald[1] = bin2bcd(t->time.tm_hour);
	else
		ald[1] = (t->time.tm_hour >= 12 ? 0x20 : 0)
			| bin2bcd((t->time.tm_hour + 11) % 12 + 1);

	dev_dbg(dev, "%s: write 0x%02x 0x%02x\n", __func__, ald[0], ald[1]);

	if (rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE) {
		rx8025->ctrl1 &= ~RX8025_BIT_CTRL1_DALE;
		err = rx8025_write_reg(rx8025->client, RX8025_REG_CTRL1,
				       rx8025->ctrl1);
		if (err)
			return err;
	}
	err = rx8025_write_regs(rx8025->client, RX8025_REG_ALDMIN, 2, ald);
	if (err)
		return err;

	if (t->enabled) {
		rx8025->ctrl1 |= RX8025_BIT_CTRL1_DALE;
		err = rx8025_write_reg(rx8025->client, RX8025_REG_CTRL1,
				       rx8025->ctrl1);
		if (err)
			return err;
	}

	return 0;
}

static int rx8025_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
	struct rx8025_data *rx8025 = dev_get_drvdata(dev);
	u8 ctrl1;
	int err;

	ctrl1 = rx8025->ctrl1;
	if (enabled)
		ctrl1 |= RX8025_BIT_CTRL1_DALE;
	else
		ctrl1 &= ~RX8025_BIT_CTRL1_DALE;

	if (ctrl1 != rx8025->ctrl1) {
		rx8025->ctrl1 = ctrl1;
		err = rx8025_write_reg(rx8025->client, RX8025_REG_CTRL1,
				       rx8025->ctrl1);
		if (err)
			return err;
	}
	return 0;
}

static int rx8025_irq_set_state(struct device *dev, int enabled)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct rx8025_data *rx8025 = i2c_get_clientdata(client);
	int ctrl1;
	int err;

	if (client->irq <= 0)
		return -ENXIO;

	ctrl1 = rx8025->ctrl1 & ~RX8025_BIT_CTRL1_CT;
	if (enabled)
		ctrl1 |= RX8025_BIT_CTRL1_CT_1HZ;
	if (ctrl1 != rx8025->ctrl1) {
		rx8025->ctrl1 = ctrl1;
		err = rx8025_write_reg(rx8025->client, RX8025_REG_CTRL1,
				       rx8025->ctrl1);
		if (err)
			return err;
	}

	return 0;
}

static struct rtc_class_ops rx8025_rtc_ops = {
	.read_time = rx8025_get_time,
	.set_time = rx8025_set_time,
	.read_alarm = rx8025_read_alarm,
	.set_alarm = rx8025_set_alarm,
	.alarm_irq_enable = rx8025_alarm_irq_enable,
	.irq_set_state  = rx8025_irq_set_state,
};

/*
 * Clock precision adjustment support
 *
 * According to the RX8025 SA/NB application manual the frequency and
 * temperature characteristics can be approximated using the following
 * equation:
 *
 *   df = a * (ut - t)**2
 *
 *   df: Frequency deviation in any temperature
 *   a : Coefficient = (-35 +-5) * 10**-9
 *   ut: Ultimate temperature in degree = +25 +-5 degree
 *   t : Any temperature in degree
 *
 * Note that the clock adjustment in ppb must be entered (which is
 * the negative value of the deviation).
 */
static int rx8025_get_clock_adjust(struct device *dev, int *adj)
{
	struct i2c_client *client = to_i2c_client(dev);
	u8 digoff;
	int err;

	err = rx8025_read_reg(client, RX8025_REG_DIGOFF, &digoff);
	if (err)
		return err;

	*adj = digoff >= 64 ? digoff - 128 : digoff;
	if (*adj > 0)
		(*adj)--;
	*adj *= -RX8025_ADJ_RESOLUTION;

	return 0;
}

static int rx8025_set_clock_adjust(struct device *dev, int adj)
{
	struct i2c_client *client = to_i2c_client(dev);
	u8 digoff;
	int err;

	adj /= -RX8025_ADJ_RESOLUTION;
	if (adj > RX8025_ADJ_DATA_MAX)
		adj = RX8025_ADJ_DATA_MAX;
	else if (adj < RX8025_ADJ_DATA_MIN)
		adj = RX8025_ADJ_DATA_MIN;
	else if (adj > 0)
		adj++;
	else if (adj < 0)
		adj += 128;
	digoff = adj;

	err = rx8025_write_reg(client, RX8025_REG_DIGOFF, digoff);
	if (err)
		return err;

	dev_dbg(dev, "%s: write 0x%02x\n", __func__, digoff);

	return 0;
}

static ssize_t rx8025_sysfs_show_clock_adjust(struct device *dev,
					      struct device_attribute *attr,
					      char *buf)
{
	int err, adj;

	err = rx8025_get_clock_adjust(dev, &adj);
	if (err)
		return err;

	return sprintf(buf, "%d\n", adj);
}

static ssize_t rx8025_sysfs_store_clock_adjust(struct device *dev,
					       struct device_attribute *attr,
					       const char *buf, size_t count)
{
	int adj, err;

	if (sscanf(buf, "%i", &adj) != 1)
		return -EINVAL;

	err = rx8025_set_clock_adjust(dev, adj);

	return err ? err : count;
}

static DEVICE_ATTR(clock_adjust_ppb, S_IRUGO | S_IWUSR,
		   rx8025_sysfs_show_clock_adjust,
		   rx8025_sysfs_store_clock_adjust);

static int rx8025_sysfs_register(struct device *dev)
{
	return device_create_file(dev, &dev_attr_clock_adjust_ppb);
}

static void rx8025_sysfs_unregister(struct device *dev)
{
	device_remove_file(dev, &dev_attr_clock_adjust_ppb);
}

static int __devinit rx8025_probe(struct i2c_client *client,
				  const struct i2c_device_id *id)
{
	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
	struct rx8025_data *rx8025;
	int err, need_reset = 0;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
				     | I2C_FUNC_SMBUS_I2C_BLOCK)) {
		dev_err(&adapter->dev,
			"doesn't support required functionality\n");
		err = -EIO;
		goto errout;
	}

	rx8025 = kzalloc(sizeof(*rx8025), GFP_KERNEL);
	if (!rx8025) {
		dev_err(&adapter->dev, "failed to alloc memory\n");
		err = -ENOMEM;
		goto errout;
	}

	rx8025->client = client;
	i2c_set_clientdata(client, rx8025);
	INIT_WORK(&rx8025->work, rx8025_work);

	err = rx8025_init_client(client, &need_reset);
	if (err)
		goto errout_free;

	if (need_reset) {
		struct rtc_time tm;
		dev_info(&client->dev,
			 "bad conditions detected, resetting date\n");
		rtc_time_to_tm(0, &tm);	/* 1970/1/1 */
		rx8025_set_time(&client->dev, &tm);
	}

	rx8025->rtc = rtc_device_register(client->name, &client->dev,
					  &rx8025_rtc_ops, THIS_MODULE);
	if (IS_ERR(rx8025->rtc)) {
		err = PTR_ERR(rx8025->rtc);
		dev_err(&client->dev, "unable to register the class device\n");
		goto errout_free;
	}

	if (client->irq > 0) {
		dev_info(&client->dev, "IRQ %d supplied\n", client->irq);
		err = request_irq(client->irq, rx8025_irq,
				  0, "rx8025", client);
		if (err) {
			dev_err(&client->dev, "unable to request IRQ\n");
			goto errout_reg;
		}
	}

	rx8025->rtc->irq_freq = 1;
	rx8025->rtc->max_user_freq = 1;

	err = rx8025_sysfs_register(&client->dev);
	if (err)
		goto errout_irq;

	return 0;

errout_irq:
	if (client->irq > 0)
		free_irq(client->irq, client);

errout_reg:
	rtc_device_unregister(rx8025->rtc);

errout_free:
	kfree(rx8025);

errout:
	dev_err(&adapter->dev, "probing for rx8025 failed\n");
	return err;
}

static int __devexit rx8025_remove(struct i2c_client *client)
{
	struct rx8025_data *rx8025 = i2c_get_clientdata(client);
	struct mutex *lock = &rx8025->rtc->ops_lock;

	if (client->irq > 0) {
		mutex_lock(lock);
		rx8025->exiting = 1;
		mutex_unlock(lock);

		free_irq(client->irq, client);
		flush_scheduled_work();
	}

	rx8025_sysfs_unregister(&client->dev);
	rtc_device_unregister(rx8025->rtc);
	kfree(rx8025);
	return 0;
}

static struct i2c_driver rx8025_driver = {
	.driver = {
		.name = "rtc-rx8025",
		.owner = THIS_MODULE,
	},
	.probe		= rx8025_probe,
	.remove		= __devexit_p(rx8025_remove),
	.id_table	= rx8025_id,
};

static int __init rx8025_init(void)
{
	return i2c_add_driver(&rx8025_driver);
}

static void __exit rx8025_exit(void)
{
	i2c_del_driver(&rx8025_driver);
}

MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
MODULE_DESCRIPTION("RX-8025 SA/NB RTC driver");
MODULE_LICENSE("GPL");

module_init(rx8025_init);
module_exit(rx8025_exit);