GNU Linux-libre 4.4.289-gnu1
[releases.git] / drivers / rtc / rtc-ds1374.c
1 /*
2  * RTC client/driver for the Maxim/Dallas DS1374 Real-Time Clock over I2C
3  *
4  * Based on code by Randy Vinson <rvinson@mvista.com>,
5  * which was based on the m41t00.c by Mark Greer <mgreer@mvista.com>.
6  *
7  * Copyright (C) 2014 Rose Technology
8  * Copyright (C) 2006-2007 Freescale Semiconductor
9  *
10  * 2005 (c) MontaVista Software, Inc. This file is licensed under
11  * the terms of the GNU General Public License version 2. This program
12  * is licensed "as is" without any warranty of any kind, whether express
13  * or implied.
14  */
15 /*
16  * It would be more efficient to use i2c msgs/i2c_transfer directly but, as
17  * recommened in .../Documentation/i2c/writing-clients section
18  * "Sending and receiving", using SMBus level communication is preferred.
19  */
20
21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/interrupt.h>
26 #include <linux/i2c.h>
27 #include <linux/rtc.h>
28 #include <linux/bcd.h>
29 #include <linux/workqueue.h>
30 #include <linux/slab.h>
31 #include <linux/pm.h>
32 #ifdef CONFIG_RTC_DRV_DS1374_WDT
33 #include <linux/fs.h>
34 #include <linux/ioctl.h>
35 #include <linux/miscdevice.h>
36 #include <linux/reboot.h>
37 #include <linux/watchdog.h>
38 #endif
39
40 #define DS1374_REG_TOD0         0x00 /* Time of Day */
41 #define DS1374_REG_TOD1         0x01
42 #define DS1374_REG_TOD2         0x02
43 #define DS1374_REG_TOD3         0x03
44 #define DS1374_REG_WDALM0       0x04 /* Watchdog/Alarm */
45 #define DS1374_REG_WDALM1       0x05
46 #define DS1374_REG_WDALM2       0x06
47 #define DS1374_REG_CR           0x07 /* Control */
48 #define DS1374_REG_CR_AIE       0x01 /* Alarm Int. Enable */
49 #define DS1374_REG_CR_WDALM     0x20 /* 1=Watchdog, 0=Alarm */
50 #define DS1374_REG_CR_WACE      0x40 /* WD/Alarm counter enable */
51 #define DS1374_REG_SR           0x08 /* Status */
52 #define DS1374_REG_SR_OSF       0x80 /* Oscillator Stop Flag */
53 #define DS1374_REG_SR_AF        0x01 /* Alarm Flag */
54 #define DS1374_REG_TCR          0x09 /* Trickle Charge */
55
56 static const struct i2c_device_id ds1374_id[] = {
57         { "ds1374", 0 },
58         { }
59 };
60 MODULE_DEVICE_TABLE(i2c, ds1374_id);
61
62 #ifdef CONFIG_OF
63 static const struct of_device_id ds1374_of_match[] = {
64         { .compatible = "dallas,ds1374" },
65         { }
66 };
67 MODULE_DEVICE_TABLE(of, ds1374_of_match);
68 #endif
69
70 struct ds1374 {
71         struct i2c_client *client;
72         struct rtc_device *rtc;
73         struct work_struct work;
74
75         /* The mutex protects alarm operations, and prevents a race
76          * between the enable_irq() in the workqueue and the free_irq()
77          * in the remove function.
78          */
79         struct mutex mutex;
80         int exiting;
81 };
82
83 static struct i2c_driver ds1374_driver;
84
85 static int ds1374_read_rtc(struct i2c_client *client, u32 *time,
86                            int reg, int nbytes)
87 {
88         u8 buf[4];
89         int ret;
90         int i;
91
92         if (nbytes > 4) {
93                 WARN_ON(1);
94                 return -EINVAL;
95         }
96
97         ret = i2c_smbus_read_i2c_block_data(client, reg, nbytes, buf);
98
99         if (ret < 0)
100                 return ret;
101         if (ret < nbytes)
102                 return -EIO;
103
104         for (i = nbytes - 1, *time = 0; i >= 0; i--)
105                 *time = (*time << 8) | buf[i];
106
107         return 0;
108 }
109
110 static int ds1374_write_rtc(struct i2c_client *client, u32 time,
111                             int reg, int nbytes)
112 {
113         u8 buf[4];
114         int i;
115
116         if (nbytes > 4) {
117                 WARN_ON(1);
118                 return -EINVAL;
119         }
120
121         for (i = 0; i < nbytes; i++) {
122                 buf[i] = time & 0xff;
123                 time >>= 8;
124         }
125
126         return i2c_smbus_write_i2c_block_data(client, reg, nbytes, buf);
127 }
128
129 static int ds1374_check_rtc_status(struct i2c_client *client)
130 {
131         int ret = 0;
132         int control, stat;
133
134         stat = i2c_smbus_read_byte_data(client, DS1374_REG_SR);
135         if (stat < 0)
136                 return stat;
137
138         if (stat & DS1374_REG_SR_OSF)
139                 dev_warn(&client->dev,
140                          "oscillator discontinuity flagged, time unreliable\n");
141
142         stat &= ~(DS1374_REG_SR_OSF | DS1374_REG_SR_AF);
143
144         ret = i2c_smbus_write_byte_data(client, DS1374_REG_SR, stat);
145         if (ret < 0)
146                 return ret;
147
148         /* If the alarm is pending, clear it before requesting
149          * the interrupt, so an interrupt event isn't reported
150          * before everything is initialized.
151          */
152
153         control = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
154         if (control < 0)
155                 return control;
156
157         control &= ~(DS1374_REG_CR_WACE | DS1374_REG_CR_AIE);
158         return i2c_smbus_write_byte_data(client, DS1374_REG_CR, control);
159 }
160
161 static int ds1374_read_time(struct device *dev, struct rtc_time *time)
162 {
163         struct i2c_client *client = to_i2c_client(dev);
164         u32 itime;
165         int ret;
166
167         ret = ds1374_read_rtc(client, &itime, DS1374_REG_TOD0, 4);
168         if (!ret)
169                 rtc_time_to_tm(itime, time);
170
171         return ret;
172 }
173
174 static int ds1374_set_time(struct device *dev, struct rtc_time *time)
175 {
176         struct i2c_client *client = to_i2c_client(dev);
177         unsigned long itime;
178
179         rtc_tm_to_time(time, &itime);
180         return ds1374_write_rtc(client, itime, DS1374_REG_TOD0, 4);
181 }
182
183 #ifndef CONFIG_RTC_DRV_DS1374_WDT
184 /* The ds1374 has a decrementer for an alarm, rather than a comparator.
185  * If the time of day is changed, then the alarm will need to be
186  * reset.
187  */
188 static int ds1374_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
189 {
190         struct i2c_client *client = to_i2c_client(dev);
191         struct ds1374 *ds1374 = i2c_get_clientdata(client);
192         u32 now, cur_alarm;
193         int cr, sr;
194         int ret = 0;
195
196         if (client->irq <= 0)
197                 return -EINVAL;
198
199         mutex_lock(&ds1374->mutex);
200
201         cr = ret = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
202         if (ret < 0)
203                 goto out;
204
205         sr = ret = i2c_smbus_read_byte_data(client, DS1374_REG_SR);
206         if (ret < 0)
207                 goto out;
208
209         ret = ds1374_read_rtc(client, &now, DS1374_REG_TOD0, 4);
210         if (ret)
211                 goto out;
212
213         ret = ds1374_read_rtc(client, &cur_alarm, DS1374_REG_WDALM0, 3);
214         if (ret)
215                 goto out;
216
217         rtc_time_to_tm(now + cur_alarm, &alarm->time);
218         alarm->enabled = !!(cr & DS1374_REG_CR_WACE);
219         alarm->pending = !!(sr & DS1374_REG_SR_AF);
220
221 out:
222         mutex_unlock(&ds1374->mutex);
223         return ret;
224 }
225
226 static int ds1374_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
227 {
228         struct i2c_client *client = to_i2c_client(dev);
229         struct ds1374 *ds1374 = i2c_get_clientdata(client);
230         struct rtc_time now;
231         unsigned long new_alarm, itime;
232         int cr;
233         int ret = 0;
234
235         if (client->irq <= 0)
236                 return -EINVAL;
237
238         ret = ds1374_read_time(dev, &now);
239         if (ret < 0)
240                 return ret;
241
242         rtc_tm_to_time(&alarm->time, &new_alarm);
243         rtc_tm_to_time(&now, &itime);
244
245         /* This can happen due to races, in addition to dates that are
246          * truly in the past.  To avoid requiring the caller to check for
247          * races, dates in the past are assumed to be in the recent past
248          * (i.e. not something that we'd rather the caller know about via
249          * an error), and the alarm is set to go off as soon as possible.
250          */
251         if (time_before_eq(new_alarm, itime))
252                 new_alarm = 1;
253         else
254                 new_alarm -= itime;
255
256         mutex_lock(&ds1374->mutex);
257
258         ret = cr = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
259         if (ret < 0)
260                 goto out;
261
262         /* Disable any existing alarm before setting the new one
263          * (or lack thereof). */
264         cr &= ~DS1374_REG_CR_WACE;
265
266         ret = i2c_smbus_write_byte_data(client, DS1374_REG_CR, cr);
267         if (ret < 0)
268                 goto out;
269
270         ret = ds1374_write_rtc(client, new_alarm, DS1374_REG_WDALM0, 3);
271         if (ret)
272                 goto out;
273
274         if (alarm->enabled) {
275                 cr |= DS1374_REG_CR_WACE | DS1374_REG_CR_AIE;
276                 cr &= ~DS1374_REG_CR_WDALM;
277
278                 ret = i2c_smbus_write_byte_data(client, DS1374_REG_CR, cr);
279         }
280
281 out:
282         mutex_unlock(&ds1374->mutex);
283         return ret;
284 }
285 #endif
286
287 static irqreturn_t ds1374_irq(int irq, void *dev_id)
288 {
289         struct i2c_client *client = dev_id;
290         struct ds1374 *ds1374 = i2c_get_clientdata(client);
291
292         disable_irq_nosync(irq);
293         schedule_work(&ds1374->work);
294         return IRQ_HANDLED;
295 }
296
297 static void ds1374_work(struct work_struct *work)
298 {
299         struct ds1374 *ds1374 = container_of(work, struct ds1374, work);
300         struct i2c_client *client = ds1374->client;
301         int stat, control;
302
303         mutex_lock(&ds1374->mutex);
304
305         stat = i2c_smbus_read_byte_data(client, DS1374_REG_SR);
306         if (stat < 0)
307                 goto unlock;
308
309         if (stat & DS1374_REG_SR_AF) {
310                 stat &= ~DS1374_REG_SR_AF;
311                 i2c_smbus_write_byte_data(client, DS1374_REG_SR, stat);
312
313                 control = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
314                 if (control < 0)
315                         goto out;
316
317                 control &= ~(DS1374_REG_CR_WACE | DS1374_REG_CR_AIE);
318                 i2c_smbus_write_byte_data(client, DS1374_REG_CR, control);
319
320                 rtc_update_irq(ds1374->rtc, 1, RTC_AF | RTC_IRQF);
321         }
322
323 out:
324         if (!ds1374->exiting)
325                 enable_irq(client->irq);
326 unlock:
327         mutex_unlock(&ds1374->mutex);
328 }
329
330 #ifndef CONFIG_RTC_DRV_DS1374_WDT
331 static int ds1374_alarm_irq_enable(struct device *dev, unsigned int enabled)
332 {
333         struct i2c_client *client = to_i2c_client(dev);
334         struct ds1374 *ds1374 = i2c_get_clientdata(client);
335         int ret;
336
337         mutex_lock(&ds1374->mutex);
338
339         ret = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
340         if (ret < 0)
341                 goto out;
342
343         if (enabled) {
344                 ret |= DS1374_REG_CR_WACE | DS1374_REG_CR_AIE;
345                 ret &= ~DS1374_REG_CR_WDALM;
346         } else {
347                 ret &= ~DS1374_REG_CR_WACE;
348         }
349         ret = i2c_smbus_write_byte_data(client, DS1374_REG_CR, ret);
350
351 out:
352         mutex_unlock(&ds1374->mutex);
353         return ret;
354 }
355 #endif
356
357 static const struct rtc_class_ops ds1374_rtc_ops = {
358         .read_time = ds1374_read_time,
359         .set_time = ds1374_set_time,
360 #ifndef CONFIG_RTC_DRV_DS1374_WDT
361         .read_alarm = ds1374_read_alarm,
362         .set_alarm = ds1374_set_alarm,
363         .alarm_irq_enable = ds1374_alarm_irq_enable,
364 #endif
365 };
366
367 #ifdef CONFIG_RTC_DRV_DS1374_WDT
368 /*
369  *****************************************************************************
370  *
371  * Watchdog Driver
372  *
373  *****************************************************************************
374  */
375 static struct i2c_client *save_client;
376 /* Default margin */
377 #define WD_TIMO 131762
378
379 #define DRV_NAME "DS1374 Watchdog"
380
381 static int wdt_margin = WD_TIMO;
382 static unsigned long wdt_is_open;
383 module_param(wdt_margin, int, 0);
384 MODULE_PARM_DESC(wdt_margin, "Watchdog timeout in seconds (default 32s)");
385
386 static const struct watchdog_info ds1374_wdt_info = {
387         .identity       = "DS1374 WTD",
388         .options        = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
389                                                 WDIOF_MAGICCLOSE,
390 };
391
392 static int ds1374_wdt_settimeout(unsigned int timeout)
393 {
394         int ret = -ENOIOCTLCMD;
395         int cr;
396
397         ret = cr = i2c_smbus_read_byte_data(save_client, DS1374_REG_CR);
398         if (ret < 0)
399                 goto out;
400
401         /* Disable any existing watchdog/alarm before setting the new one */
402         cr &= ~DS1374_REG_CR_WACE;
403
404         ret = i2c_smbus_write_byte_data(save_client, DS1374_REG_CR, cr);
405         if (ret < 0)
406                 goto out;
407
408         /* Set new watchdog time */
409         ret = ds1374_write_rtc(save_client, timeout, DS1374_REG_WDALM0, 3);
410         if (ret) {
411                 pr_info("couldn't set new watchdog time\n");
412                 goto out;
413         }
414
415         /* Enable watchdog timer */
416         cr |= DS1374_REG_CR_WACE | DS1374_REG_CR_WDALM;
417         cr &= ~DS1374_REG_CR_AIE;
418
419         ret = i2c_smbus_write_byte_data(save_client, DS1374_REG_CR, cr);
420         if (ret < 0)
421                 goto out;
422
423         return 0;
424 out:
425         return ret;
426 }
427
428
429 /*
430  * Reload the watchdog timer.  (ie, pat the watchdog)
431  */
432 static void ds1374_wdt_ping(void)
433 {
434         u32 val;
435         int ret = 0;
436
437         ret = ds1374_read_rtc(save_client, &val, DS1374_REG_WDALM0, 3);
438         if (ret)
439                 pr_info("WD TICK FAIL!!!!!!!!!! %i\n", ret);
440 }
441
442 static void ds1374_wdt_disable(void)
443 {
444         int ret = -ENOIOCTLCMD;
445         int cr;
446
447         cr = i2c_smbus_read_byte_data(save_client, DS1374_REG_CR);
448         /* Disable watchdog timer */
449         cr &= ~DS1374_REG_CR_WACE;
450
451         ret = i2c_smbus_write_byte_data(save_client, DS1374_REG_CR, cr);
452 }
453
454 /*
455  * Watchdog device is opened, and watchdog starts running.
456  */
457 static int ds1374_wdt_open(struct inode *inode, struct file *file)
458 {
459         struct ds1374 *ds1374 = i2c_get_clientdata(save_client);
460
461         if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) {
462                 mutex_lock(&ds1374->mutex);
463                 if (test_and_set_bit(0, &wdt_is_open)) {
464                         mutex_unlock(&ds1374->mutex);
465                         return -EBUSY;
466                 }
467                 /*
468                  *      Activate
469                  */
470                 wdt_is_open = 1;
471                 mutex_unlock(&ds1374->mutex);
472                 return nonseekable_open(inode, file);
473         }
474         return -ENODEV;
475 }
476
477 /*
478  * Close the watchdog device.
479  */
480 static int ds1374_wdt_release(struct inode *inode, struct file *file)
481 {
482         if (MINOR(inode->i_rdev) == WATCHDOG_MINOR)
483                 clear_bit(0, &wdt_is_open);
484
485         return 0;
486 }
487
488 /*
489  * Pat the watchdog whenever device is written to.
490  */
491 static ssize_t ds1374_wdt_write(struct file *file, const char __user *data,
492                                 size_t len, loff_t *ppos)
493 {
494         if (len) {
495                 ds1374_wdt_ping();
496                 return 1;
497         }
498         return 0;
499 }
500
501 static ssize_t ds1374_wdt_read(struct file *file, char __user *data,
502                                 size_t len, loff_t *ppos)
503 {
504         return 0;
505 }
506
507 /*
508  * Handle commands from user-space.
509  */
510 static long ds1374_wdt_ioctl(struct file *file, unsigned int cmd,
511                                                         unsigned long arg)
512 {
513         int new_margin, options;
514
515         switch (cmd) {
516         case WDIOC_GETSUPPORT:
517                 return copy_to_user((struct watchdog_info __user *)arg,
518                 &ds1374_wdt_info, sizeof(ds1374_wdt_info)) ? -EFAULT : 0;
519
520         case WDIOC_GETSTATUS:
521         case WDIOC_GETBOOTSTATUS:
522                 return put_user(0, (int __user *)arg);
523         case WDIOC_KEEPALIVE:
524                 ds1374_wdt_ping();
525                 return 0;
526         case WDIOC_SETTIMEOUT:
527                 if (get_user(new_margin, (int __user *)arg))
528                         return -EFAULT;
529
530                 /* the hardware's tick rate is 4096 Hz, so
531                  * the counter value needs to be scaled accordingly
532                  */
533                 new_margin <<= 12;
534                 if (new_margin < 1 || new_margin > 16777216)
535                         return -EINVAL;
536
537                 wdt_margin = new_margin;
538                 ds1374_wdt_settimeout(new_margin);
539                 ds1374_wdt_ping();
540                 /* fallthrough */
541         case WDIOC_GETTIMEOUT:
542                 /* when returning ... inverse is true */
543                 return put_user((wdt_margin >> 12), (int __user *)arg);
544         case WDIOC_SETOPTIONS:
545                 if (copy_from_user(&options, (int __user *)arg, sizeof(int)))
546                         return -EFAULT;
547
548                 if (options & WDIOS_DISABLECARD) {
549                         pr_info("disable watchdog\n");
550                         ds1374_wdt_disable();
551                         return 0;
552                 }
553
554                 if (options & WDIOS_ENABLECARD) {
555                         pr_info("enable watchdog\n");
556                         ds1374_wdt_settimeout(wdt_margin);
557                         ds1374_wdt_ping();
558                         return 0;
559                 }
560                 return -EINVAL;
561         }
562         return -ENOTTY;
563 }
564
565 static long ds1374_wdt_unlocked_ioctl(struct file *file, unsigned int cmd,
566                         unsigned long arg)
567 {
568         int ret;
569         struct ds1374 *ds1374 = i2c_get_clientdata(save_client);
570
571         mutex_lock(&ds1374->mutex);
572         ret = ds1374_wdt_ioctl(file, cmd, arg);
573         mutex_unlock(&ds1374->mutex);
574
575         return ret;
576 }
577
578 static int ds1374_wdt_notify_sys(struct notifier_block *this,
579                         unsigned long code, void *unused)
580 {
581         if (code == SYS_DOWN || code == SYS_HALT)
582                 /* Disable Watchdog */
583                 ds1374_wdt_disable();
584         return NOTIFY_DONE;
585 }
586
587 static const struct file_operations ds1374_wdt_fops = {
588         .owner                  = THIS_MODULE,
589         .read                   = ds1374_wdt_read,
590         .unlocked_ioctl         = ds1374_wdt_unlocked_ioctl,
591         .write                  = ds1374_wdt_write,
592         .open                   = ds1374_wdt_open,
593         .release                = ds1374_wdt_release,
594         .llseek                 = no_llseek,
595 };
596
597 static struct miscdevice ds1374_miscdev = {
598         .minor          = WATCHDOG_MINOR,
599         .name           = "watchdog",
600         .fops           = &ds1374_wdt_fops,
601 };
602
603 static struct notifier_block ds1374_wdt_notifier = {
604         .notifier_call = ds1374_wdt_notify_sys,
605 };
606
607 #endif /*CONFIG_RTC_DRV_DS1374_WDT*/
608 /*
609  *****************************************************************************
610  *
611  *      Driver Interface
612  *
613  *****************************************************************************
614  */
615 static int ds1374_probe(struct i2c_client *client,
616                         const struct i2c_device_id *id)
617 {
618         struct ds1374 *ds1374;
619         int ret;
620
621         ds1374 = devm_kzalloc(&client->dev, sizeof(struct ds1374), GFP_KERNEL);
622         if (!ds1374)
623                 return -ENOMEM;
624
625         ds1374->client = client;
626         i2c_set_clientdata(client, ds1374);
627
628         INIT_WORK(&ds1374->work, ds1374_work);
629         mutex_init(&ds1374->mutex);
630
631         ret = ds1374_check_rtc_status(client);
632         if (ret)
633                 return ret;
634
635         if (client->irq > 0) {
636                 ret = devm_request_irq(&client->dev, client->irq, ds1374_irq, 0,
637                                         "ds1374", client);
638                 if (ret) {
639                         dev_err(&client->dev, "unable to request IRQ\n");
640                         return ret;
641                 }
642
643                 device_set_wakeup_capable(&client->dev, 1);
644         }
645
646         ds1374->rtc = devm_rtc_device_register(&client->dev, client->name,
647                                                 &ds1374_rtc_ops, THIS_MODULE);
648         if (IS_ERR(ds1374->rtc)) {
649                 dev_err(&client->dev, "unable to register the class device\n");
650                 return PTR_ERR(ds1374->rtc);
651         }
652
653 #ifdef CONFIG_RTC_DRV_DS1374_WDT
654         save_client = client;
655         ret = misc_register(&ds1374_miscdev);
656         if (ret)
657                 return ret;
658         ret = register_reboot_notifier(&ds1374_wdt_notifier);
659         if (ret) {
660                 misc_deregister(&ds1374_miscdev);
661                 return ret;
662         }
663         ds1374_wdt_settimeout(131072);
664 #endif
665
666         return 0;
667 }
668
669 static int ds1374_remove(struct i2c_client *client)
670 {
671         struct ds1374 *ds1374 = i2c_get_clientdata(client);
672 #ifdef CONFIG_RTC_DRV_DS1374_WDT
673         misc_deregister(&ds1374_miscdev);
674         ds1374_miscdev.parent = NULL;
675         unregister_reboot_notifier(&ds1374_wdt_notifier);
676 #endif
677
678         if (client->irq > 0) {
679                 mutex_lock(&ds1374->mutex);
680                 ds1374->exiting = 1;
681                 mutex_unlock(&ds1374->mutex);
682
683                 devm_free_irq(&client->dev, client->irq, client);
684                 cancel_work_sync(&ds1374->work);
685         }
686
687         return 0;
688 }
689
690 #ifdef CONFIG_PM_SLEEP
691 static int ds1374_suspend(struct device *dev)
692 {
693         struct i2c_client *client = to_i2c_client(dev);
694
695         if (client->irq > 0 && device_may_wakeup(&client->dev))
696                 enable_irq_wake(client->irq);
697         return 0;
698 }
699
700 static int ds1374_resume(struct device *dev)
701 {
702         struct i2c_client *client = to_i2c_client(dev);
703
704         if (client->irq > 0 && device_may_wakeup(&client->dev))
705                 disable_irq_wake(client->irq);
706         return 0;
707 }
708 #endif
709
710 static SIMPLE_DEV_PM_OPS(ds1374_pm, ds1374_suspend, ds1374_resume);
711
712 static struct i2c_driver ds1374_driver = {
713         .driver = {
714                 .name = "rtc-ds1374",
715                 .pm = &ds1374_pm,
716         },
717         .probe = ds1374_probe,
718         .remove = ds1374_remove,
719         .id_table = ds1374_id,
720 };
721
722 module_i2c_driver(ds1374_driver);
723
724 MODULE_AUTHOR("Scott Wood <scottwood@freescale.com>");
725 MODULE_DESCRIPTION("Maxim/Dallas DS1374 RTC Driver");
726 MODULE_LICENSE("GPL");