Merge tag 'rtc-5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux
[sfrench/cifs-2.6.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  * recommended in .../Documentation/i2c/writing-clients.rst 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 (WARN_ON(nbytes > 4))
93                 return -EINVAL;
94
95         ret = i2c_smbus_read_i2c_block_data(client, reg, nbytes, buf);
96
97         if (ret < 0)
98                 return ret;
99         if (ret < nbytes)
100                 return -EIO;
101
102         for (i = nbytes - 1, *time = 0; i >= 0; i--)
103                 *time = (*time << 8) | buf[i];
104
105         return 0;
106 }
107
108 static int ds1374_write_rtc(struct i2c_client *client, u32 time,
109                             int reg, int nbytes)
110 {
111         u8 buf[4];
112         int i;
113
114         if (nbytes > 4) {
115                 WARN_ON(1);
116                 return -EINVAL;
117         }
118
119         for (i = 0; i < nbytes; i++) {
120                 buf[i] = time & 0xff;
121                 time >>= 8;
122         }
123
124         return i2c_smbus_write_i2c_block_data(client, reg, nbytes, buf);
125 }
126
127 static int ds1374_check_rtc_status(struct i2c_client *client)
128 {
129         int ret = 0;
130         int control, stat;
131
132         stat = i2c_smbus_read_byte_data(client, DS1374_REG_SR);
133         if (stat < 0)
134                 return stat;
135
136         if (stat & DS1374_REG_SR_OSF)
137                 dev_warn(&client->dev,
138                          "oscillator discontinuity flagged, time unreliable\n");
139
140         stat &= ~(DS1374_REG_SR_OSF | DS1374_REG_SR_AF);
141
142         ret = i2c_smbus_write_byte_data(client, DS1374_REG_SR, stat);
143         if (ret < 0)
144                 return ret;
145
146         /* If the alarm is pending, clear it before requesting
147          * the interrupt, so an interrupt event isn't reported
148          * before everything is initialized.
149          */
150
151         control = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
152         if (control < 0)
153                 return control;
154
155         control &= ~(DS1374_REG_CR_WACE | DS1374_REG_CR_AIE);
156         return i2c_smbus_write_byte_data(client, DS1374_REG_CR, control);
157 }
158
159 static int ds1374_read_time(struct device *dev, struct rtc_time *time)
160 {
161         struct i2c_client *client = to_i2c_client(dev);
162         u32 itime;
163         int ret;
164
165         ret = ds1374_read_rtc(client, &itime, DS1374_REG_TOD0, 4);
166         if (!ret)
167                 rtc_time_to_tm(itime, time);
168
169         return ret;
170 }
171
172 static int ds1374_set_time(struct device *dev, struct rtc_time *time)
173 {
174         struct i2c_client *client = to_i2c_client(dev);
175         unsigned long itime;
176
177         rtc_tm_to_time(time, &itime);
178         return ds1374_write_rtc(client, itime, DS1374_REG_TOD0, 4);
179 }
180
181 #ifndef CONFIG_RTC_DRV_DS1374_WDT
182 /* The ds1374 has a decrementer for an alarm, rather than a comparator.
183  * If the time of day is changed, then the alarm will need to be
184  * reset.
185  */
186 static int ds1374_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
187 {
188         struct i2c_client *client = to_i2c_client(dev);
189         struct ds1374 *ds1374 = i2c_get_clientdata(client);
190         u32 now, cur_alarm;
191         int cr, sr;
192         int ret = 0;
193
194         if (client->irq <= 0)
195                 return -EINVAL;
196
197         mutex_lock(&ds1374->mutex);
198
199         cr = ret = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
200         if (ret < 0)
201                 goto out;
202
203         sr = ret = i2c_smbus_read_byte_data(client, DS1374_REG_SR);
204         if (ret < 0)
205                 goto out;
206
207         ret = ds1374_read_rtc(client, &now, DS1374_REG_TOD0, 4);
208         if (ret)
209                 goto out;
210
211         ret = ds1374_read_rtc(client, &cur_alarm, DS1374_REG_WDALM0, 3);
212         if (ret)
213                 goto out;
214
215         rtc_time_to_tm(now + cur_alarm, &alarm->time);
216         alarm->enabled = !!(cr & DS1374_REG_CR_WACE);
217         alarm->pending = !!(sr & DS1374_REG_SR_AF);
218
219 out:
220         mutex_unlock(&ds1374->mutex);
221         return ret;
222 }
223
224 static int ds1374_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
225 {
226         struct i2c_client *client = to_i2c_client(dev);
227         struct ds1374 *ds1374 = i2c_get_clientdata(client);
228         struct rtc_time now;
229         unsigned long new_alarm, itime;
230         int cr;
231         int ret = 0;
232
233         if (client->irq <= 0)
234                 return -EINVAL;
235
236         ret = ds1374_read_time(dev, &now);
237         if (ret < 0)
238                 return ret;
239
240         rtc_tm_to_time(&alarm->time, &new_alarm);
241         rtc_tm_to_time(&now, &itime);
242
243         /* This can happen due to races, in addition to dates that are
244          * truly in the past.  To avoid requiring the caller to check for
245          * races, dates in the past are assumed to be in the recent past
246          * (i.e. not something that we'd rather the caller know about via
247          * an error), and the alarm is set to go off as soon as possible.
248          */
249         if (time_before_eq(new_alarm, itime))
250                 new_alarm = 1;
251         else
252                 new_alarm -= itime;
253
254         mutex_lock(&ds1374->mutex);
255
256         ret = cr = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
257         if (ret < 0)
258                 goto out;
259
260         /* Disable any existing alarm before setting the new one
261          * (or lack thereof). */
262         cr &= ~DS1374_REG_CR_WACE;
263
264         ret = i2c_smbus_write_byte_data(client, DS1374_REG_CR, cr);
265         if (ret < 0)
266                 goto out;
267
268         ret = ds1374_write_rtc(client, new_alarm, DS1374_REG_WDALM0, 3);
269         if (ret)
270                 goto out;
271
272         if (alarm->enabled) {
273                 cr |= DS1374_REG_CR_WACE | DS1374_REG_CR_AIE;
274                 cr &= ~DS1374_REG_CR_WDALM;
275
276                 ret = i2c_smbus_write_byte_data(client, DS1374_REG_CR, cr);
277         }
278
279 out:
280         mutex_unlock(&ds1374->mutex);
281         return ret;
282 }
283 #endif
284
285 static irqreturn_t ds1374_irq(int irq, void *dev_id)
286 {
287         struct i2c_client *client = dev_id;
288         struct ds1374 *ds1374 = i2c_get_clientdata(client);
289
290         disable_irq_nosync(irq);
291         schedule_work(&ds1374->work);
292         return IRQ_HANDLED;
293 }
294
295 static void ds1374_work(struct work_struct *work)
296 {
297         struct ds1374 *ds1374 = container_of(work, struct ds1374, work);
298         struct i2c_client *client = ds1374->client;
299         int stat, control;
300
301         mutex_lock(&ds1374->mutex);
302
303         stat = i2c_smbus_read_byte_data(client, DS1374_REG_SR);
304         if (stat < 0)
305                 goto unlock;
306
307         if (stat & DS1374_REG_SR_AF) {
308                 stat &= ~DS1374_REG_SR_AF;
309                 i2c_smbus_write_byte_data(client, DS1374_REG_SR, stat);
310
311                 control = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
312                 if (control < 0)
313                         goto out;
314
315                 control &= ~(DS1374_REG_CR_WACE | DS1374_REG_CR_AIE);
316                 i2c_smbus_write_byte_data(client, DS1374_REG_CR, control);
317
318                 rtc_update_irq(ds1374->rtc, 1, RTC_AF | RTC_IRQF);
319         }
320
321 out:
322         if (!ds1374->exiting)
323                 enable_irq(client->irq);
324 unlock:
325         mutex_unlock(&ds1374->mutex);
326 }
327
328 #ifndef CONFIG_RTC_DRV_DS1374_WDT
329 static int ds1374_alarm_irq_enable(struct device *dev, unsigned int enabled)
330 {
331         struct i2c_client *client = to_i2c_client(dev);
332         struct ds1374 *ds1374 = i2c_get_clientdata(client);
333         int ret;
334
335         mutex_lock(&ds1374->mutex);
336
337         ret = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
338         if (ret < 0)
339                 goto out;
340
341         if (enabled) {
342                 ret |= DS1374_REG_CR_WACE | DS1374_REG_CR_AIE;
343                 ret &= ~DS1374_REG_CR_WDALM;
344         } else {
345                 ret &= ~DS1374_REG_CR_WACE;
346         }
347         ret = i2c_smbus_write_byte_data(client, DS1374_REG_CR, ret);
348
349 out:
350         mutex_unlock(&ds1374->mutex);
351         return ret;
352 }
353 #endif
354
355 static const struct rtc_class_ops ds1374_rtc_ops = {
356         .read_time = ds1374_read_time,
357         .set_time = ds1374_set_time,
358 #ifndef CONFIG_RTC_DRV_DS1374_WDT
359         .read_alarm = ds1374_read_alarm,
360         .set_alarm = ds1374_set_alarm,
361         .alarm_irq_enable = ds1374_alarm_irq_enable,
362 #endif
363 };
364
365 #ifdef CONFIG_RTC_DRV_DS1374_WDT
366 /*
367  *****************************************************************************
368  *
369  * Watchdog Driver
370  *
371  *****************************************************************************
372  */
373 static struct i2c_client *save_client;
374 /* Default margin */
375 #define WD_TIMO 131762
376
377 #define DRV_NAME "DS1374 Watchdog"
378
379 static int wdt_margin = WD_TIMO;
380 static unsigned long wdt_is_open;
381 module_param(wdt_margin, int, 0);
382 MODULE_PARM_DESC(wdt_margin, "Watchdog timeout in seconds (default 32s)");
383
384 static const struct watchdog_info ds1374_wdt_info = {
385         .identity       = "DS1374 WTD",
386         .options        = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
387                                                 WDIOF_MAGICCLOSE,
388 };
389
390 static int ds1374_wdt_settimeout(unsigned int timeout)
391 {
392         int ret = -ENOIOCTLCMD;
393         int cr;
394
395         ret = cr = i2c_smbus_read_byte_data(save_client, DS1374_REG_CR);
396         if (ret < 0)
397                 goto out;
398
399         /* Disable any existing watchdog/alarm before setting the new one */
400         cr &= ~DS1374_REG_CR_WACE;
401
402         ret = i2c_smbus_write_byte_data(save_client, DS1374_REG_CR, cr);
403         if (ret < 0)
404                 goto out;
405
406         /* Set new watchdog time */
407         ret = ds1374_write_rtc(save_client, timeout, DS1374_REG_WDALM0, 3);
408         if (ret) {
409                 pr_info("couldn't set new watchdog time\n");
410                 goto out;
411         }
412
413         /* Enable watchdog timer */
414         cr |= DS1374_REG_CR_WACE | DS1374_REG_CR_WDALM;
415         cr &= ~DS1374_REG_CR_AIE;
416
417         ret = i2c_smbus_write_byte_data(save_client, DS1374_REG_CR, cr);
418         if (ret < 0)
419                 goto out;
420
421         return 0;
422 out:
423         return ret;
424 }
425
426
427 /*
428  * Reload the watchdog timer.  (ie, pat the watchdog)
429  */
430 static void ds1374_wdt_ping(void)
431 {
432         u32 val;
433         int ret = 0;
434
435         ret = ds1374_read_rtc(save_client, &val, DS1374_REG_WDALM0, 3);
436         if (ret)
437                 pr_info("WD TICK FAIL!!!!!!!!!! %i\n", ret);
438 }
439
440 static void ds1374_wdt_disable(void)
441 {
442         int cr;
443
444         cr = i2c_smbus_read_byte_data(save_client, DS1374_REG_CR);
445         /* Disable watchdog timer */
446         cr &= ~DS1374_REG_CR_WACE;
447
448         i2c_smbus_write_byte_data(save_client, DS1374_REG_CR, cr);
449 }
450
451 /*
452  * Watchdog device is opened, and watchdog starts running.
453  */
454 static int ds1374_wdt_open(struct inode *inode, struct file *file)
455 {
456         struct ds1374 *ds1374 = i2c_get_clientdata(save_client);
457
458         if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) {
459                 mutex_lock(&ds1374->mutex);
460                 if (test_and_set_bit(0, &wdt_is_open)) {
461                         mutex_unlock(&ds1374->mutex);
462                         return -EBUSY;
463                 }
464                 /*
465                  *      Activate
466                  */
467                 wdt_is_open = 1;
468                 mutex_unlock(&ds1374->mutex);
469                 return stream_open(inode, file);
470         }
471         return -ENODEV;
472 }
473
474 /*
475  * Close the watchdog device.
476  */
477 static int ds1374_wdt_release(struct inode *inode, struct file *file)
478 {
479         if (MINOR(inode->i_rdev) == WATCHDOG_MINOR)
480                 clear_bit(0, &wdt_is_open);
481
482         return 0;
483 }
484
485 /*
486  * Pat the watchdog whenever device is written to.
487  */
488 static ssize_t ds1374_wdt_write(struct file *file, const char __user *data,
489                                 size_t len, loff_t *ppos)
490 {
491         if (len) {
492                 ds1374_wdt_ping();
493                 return 1;
494         }
495         return 0;
496 }
497
498 static ssize_t ds1374_wdt_read(struct file *file, char __user *data,
499                                 size_t len, loff_t *ppos)
500 {
501         return 0;
502 }
503
504 /*
505  * Handle commands from user-space.
506  */
507 static long ds1374_wdt_ioctl(struct file *file, unsigned int cmd,
508                                                         unsigned long arg)
509 {
510         int new_margin, options;
511
512         switch (cmd) {
513         case WDIOC_GETSUPPORT:
514                 return copy_to_user((struct watchdog_info __user *)arg,
515                 &ds1374_wdt_info, sizeof(ds1374_wdt_info)) ? -EFAULT : 0;
516
517         case WDIOC_GETSTATUS:
518         case WDIOC_GETBOOTSTATUS:
519                 return put_user(0, (int __user *)arg);
520         case WDIOC_KEEPALIVE:
521                 ds1374_wdt_ping();
522                 return 0;
523         case WDIOC_SETTIMEOUT:
524                 if (get_user(new_margin, (int __user *)arg))
525                         return -EFAULT;
526
527                 /* the hardware's tick rate is 4096 Hz, so
528                  * the counter value needs to be scaled accordingly
529                  */
530                 new_margin <<= 12;
531                 if (new_margin < 1 || new_margin > 16777216)
532                         return -EINVAL;
533
534                 wdt_margin = new_margin;
535                 ds1374_wdt_settimeout(new_margin);
536                 ds1374_wdt_ping();
537                 /* fallthrough */
538         case WDIOC_GETTIMEOUT:
539                 /* when returning ... inverse is true */
540                 return put_user((wdt_margin >> 12), (int __user *)arg);
541         case WDIOC_SETOPTIONS:
542                 if (copy_from_user(&options, (int __user *)arg, sizeof(int)))
543                         return -EFAULT;
544
545                 if (options & WDIOS_DISABLECARD) {
546                         pr_info("disable watchdog\n");
547                         ds1374_wdt_disable();
548                         return 0;
549                 }
550
551                 if (options & WDIOS_ENABLECARD) {
552                         pr_info("enable watchdog\n");
553                         ds1374_wdt_settimeout(wdt_margin);
554                         ds1374_wdt_ping();
555                         return 0;
556                 }
557                 return -EINVAL;
558         }
559         return -ENOTTY;
560 }
561
562 static long ds1374_wdt_unlocked_ioctl(struct file *file, unsigned int cmd,
563                         unsigned long arg)
564 {
565         int ret;
566         struct ds1374 *ds1374 = i2c_get_clientdata(save_client);
567
568         mutex_lock(&ds1374->mutex);
569         ret = ds1374_wdt_ioctl(file, cmd, arg);
570         mutex_unlock(&ds1374->mutex);
571
572         return ret;
573 }
574
575 static int ds1374_wdt_notify_sys(struct notifier_block *this,
576                         unsigned long code, void *unused)
577 {
578         if (code == SYS_DOWN || code == SYS_HALT)
579                 /* Disable Watchdog */
580                 ds1374_wdt_disable();
581         return NOTIFY_DONE;
582 }
583
584 static const struct file_operations ds1374_wdt_fops = {
585         .owner                  = THIS_MODULE,
586         .read                   = ds1374_wdt_read,
587         .unlocked_ioctl         = ds1374_wdt_unlocked_ioctl,
588         .compat_ioctl           = compat_ptr_ioctl,
589         .write                  = ds1374_wdt_write,
590         .open                   = ds1374_wdt_open,
591         .release                = ds1374_wdt_release,
592         .llseek                 = no_llseek,
593 };
594
595 static struct miscdevice ds1374_miscdev = {
596         .minor          = WATCHDOG_MINOR,
597         .name           = "watchdog",
598         .fops           = &ds1374_wdt_fops,
599 };
600
601 static struct notifier_block ds1374_wdt_notifier = {
602         .notifier_call = ds1374_wdt_notify_sys,
603 };
604
605 #endif /*CONFIG_RTC_DRV_DS1374_WDT*/
606 /*
607  *****************************************************************************
608  *
609  *      Driver Interface
610  *
611  *****************************************************************************
612  */
613 static int ds1374_probe(struct i2c_client *client,
614                         const struct i2c_device_id *id)
615 {
616         struct ds1374 *ds1374;
617         int ret;
618
619         ds1374 = devm_kzalloc(&client->dev, sizeof(struct ds1374), GFP_KERNEL);
620         if (!ds1374)
621                 return -ENOMEM;
622
623         ds1374->client = client;
624         i2c_set_clientdata(client, ds1374);
625
626         INIT_WORK(&ds1374->work, ds1374_work);
627         mutex_init(&ds1374->mutex);
628
629         ret = ds1374_check_rtc_status(client);
630         if (ret)
631                 return ret;
632
633         if (client->irq > 0) {
634                 ret = devm_request_irq(&client->dev, client->irq, ds1374_irq, 0,
635                                         "ds1374", client);
636                 if (ret) {
637                         dev_err(&client->dev, "unable to request IRQ\n");
638                         return ret;
639                 }
640
641                 device_set_wakeup_capable(&client->dev, 1);
642         }
643
644         ds1374->rtc = devm_rtc_device_register(&client->dev, client->name,
645                                                 &ds1374_rtc_ops, THIS_MODULE);
646         if (IS_ERR(ds1374->rtc)) {
647                 dev_err(&client->dev, "unable to register the class device\n");
648                 return PTR_ERR(ds1374->rtc);
649         }
650
651 #ifdef CONFIG_RTC_DRV_DS1374_WDT
652         save_client = client;
653         ret = misc_register(&ds1374_miscdev);
654         if (ret)
655                 return ret;
656         ret = register_reboot_notifier(&ds1374_wdt_notifier);
657         if (ret) {
658                 misc_deregister(&ds1374_miscdev);
659                 return ret;
660         }
661         ds1374_wdt_settimeout(131072);
662 #endif
663
664         return 0;
665 }
666
667 static int ds1374_remove(struct i2c_client *client)
668 {
669         struct ds1374 *ds1374 = i2c_get_clientdata(client);
670 #ifdef CONFIG_RTC_DRV_DS1374_WDT
671         misc_deregister(&ds1374_miscdev);
672         ds1374_miscdev.parent = NULL;
673         unregister_reboot_notifier(&ds1374_wdt_notifier);
674 #endif
675
676         if (client->irq > 0) {
677                 mutex_lock(&ds1374->mutex);
678                 ds1374->exiting = 1;
679                 mutex_unlock(&ds1374->mutex);
680
681                 devm_free_irq(&client->dev, client->irq, client);
682                 cancel_work_sync(&ds1374->work);
683         }
684
685         return 0;
686 }
687
688 #ifdef CONFIG_PM_SLEEP
689 static int ds1374_suspend(struct device *dev)
690 {
691         struct i2c_client *client = to_i2c_client(dev);
692
693         if (client->irq > 0 && device_may_wakeup(&client->dev))
694                 enable_irq_wake(client->irq);
695         return 0;
696 }
697
698 static int ds1374_resume(struct device *dev)
699 {
700         struct i2c_client *client = to_i2c_client(dev);
701
702         if (client->irq > 0 && device_may_wakeup(&client->dev))
703                 disable_irq_wake(client->irq);
704         return 0;
705 }
706 #endif
707
708 static SIMPLE_DEV_PM_OPS(ds1374_pm, ds1374_suspend, ds1374_resume);
709
710 static struct i2c_driver ds1374_driver = {
711         .driver = {
712                 .name = "rtc-ds1374",
713                 .of_match_table = of_match_ptr(ds1374_of_match),
714                 .pm = &ds1374_pm,
715         },
716         .probe = ds1374_probe,
717         .remove = ds1374_remove,
718         .id_table = ds1374_id,
719 };
720
721 module_i2c_driver(ds1374_driver);
722
723 MODULE_AUTHOR("Scott Wood <scottwood@freescale.com>");
724 MODULE_DESCRIPTION("Maxim/Dallas DS1374 RTC Driver");
725 MODULE_LICENSE("GPL");