blob: 8605fde394b2afdb61a18ede4062b4079c5aee1f [file] [log] [blame]
Scott Woodbf4994d2007-10-16 01:28:19 -07001/*
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 *
Søren Andersen920f91e2014-12-10 15:53:54 -08007 * Copyright (C) 2014 Rose Technology
Scott Woodbf4994d2007-10-16 01:28:19 -07008 * 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#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/interrupt.h>
24#include <linux/i2c.h>
25#include <linux/rtc.h>
26#include <linux/bcd.h>
27#include <linux/workqueue.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090028#include <linux/slab.h>
Mark Brownbc96ba72011-03-22 16:34:52 -070029#include <linux/pm.h>
Søren Andersen920f91e2014-12-10 15:53:54 -080030#ifdef CONFIG_RTC_DRV_DS1374_WDT
31#include <linux/fs.h>
32#include <linux/ioctl.h>
33#include <linux/miscdevice.h>
34#include <linux/reboot.h>
35#include <linux/watchdog.h>
36#endif
Scott Woodbf4994d2007-10-16 01:28:19 -070037
38#define DS1374_REG_TOD0 0x00 /* Time of Day */
39#define DS1374_REG_TOD1 0x01
40#define DS1374_REG_TOD2 0x02
41#define DS1374_REG_TOD3 0x03
42#define DS1374_REG_WDALM0 0x04 /* Watchdog/Alarm */
43#define DS1374_REG_WDALM1 0x05
44#define DS1374_REG_WDALM2 0x06
45#define DS1374_REG_CR 0x07 /* Control */
46#define DS1374_REG_CR_AIE 0x01 /* Alarm Int. Enable */
47#define DS1374_REG_CR_WDALM 0x20 /* 1=Watchdog, 0=Alarm */
48#define DS1374_REG_CR_WACE 0x40 /* WD/Alarm counter enable */
49#define DS1374_REG_SR 0x08 /* Status */
50#define DS1374_REG_SR_OSF 0x80 /* Oscillator Stop Flag */
51#define DS1374_REG_SR_AF 0x01 /* Alarm Flag */
52#define DS1374_REG_TCR 0x09 /* Trickle Charge */
53
Jean Delvare3760f732008-04-29 23:11:40 +020054static const struct i2c_device_id ds1374_id[] = {
Jean Delvaref2eb4322008-06-05 22:46:18 -070055 { "ds1374", 0 },
Jean Delvare3760f732008-04-29 23:11:40 +020056 { }
57};
58MODULE_DEVICE_TABLE(i2c, ds1374_id);
59
Søren Andersen920f91e2014-12-10 15:53:54 -080060#ifdef CONFIG_OF
61static const struct of_device_id ds1374_of_match[] = {
62 { .compatible = "dallas,ds1374" },
63 { }
64};
65MODULE_DEVICE_TABLE(of, ds1374_of_match);
66#endif
67
Scott Woodbf4994d2007-10-16 01:28:19 -070068struct ds1374 {
69 struct i2c_client *client;
70 struct rtc_device *rtc;
71 struct work_struct work;
72
73 /* The mutex protects alarm operations, and prevents a race
74 * between the enable_irq() in the workqueue and the free_irq()
75 * in the remove function.
76 */
77 struct mutex mutex;
78 int exiting;
79};
80
81static struct i2c_driver ds1374_driver;
82
83static int ds1374_read_rtc(struct i2c_client *client, u32 *time,
Sachin Kamatadc7b9b2013-07-03 15:05:48 -070084 int reg, int nbytes)
Scott Woodbf4994d2007-10-16 01:28:19 -070085{
86 u8 buf[4];
87 int ret;
88 int i;
89
90 if (nbytes > 4) {
91 WARN_ON(1);
92 return -EINVAL;
93 }
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
108static int ds1374_write_rtc(struct i2c_client *client, u32 time,
Sachin Kamatadc7b9b2013-07-03 15:05:48 -0700109 int reg, int nbytes)
Scott Woodbf4994d2007-10-16 01:28:19 -0700110{
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
127static 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,
Sachin Kamatadc7b9b2013-07-03 15:05:48 -0700138 "oscillator discontinuity flagged, time unreliable\n");
Scott Woodbf4994d2007-10-16 01:28:19 -0700139
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
159static 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
172static 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
Søren Andersen920f91e2014-12-10 15:53:54 -0800181#ifndef CONFIG_RTC_DRV_DS1374_WDT
Scott Woodbf4994d2007-10-16 01:28:19 -0700182/* 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 */
186static 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
Anton Vorontsovb42f9312008-08-20 14:09:21 -0700194 if (client->irq <= 0)
Scott Woodbf4994d2007-10-16 01:28:19 -0700195 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
219out:
220 mutex_unlock(&ds1374->mutex);
221 return ret;
222}
223
224static 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
Anton Vorontsovb42f9312008-08-20 14:09:21 -0700233 if (client->irq <= 0)
Scott Woodbf4994d2007-10-16 01:28:19 -0700234 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
Scott Woodbf4994d2007-10-16 01:28:19 -0700243 /* 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 */
Roel Kluinfa7af8b2009-03-31 15:25:00 -0700249 if (time_before_eq(new_alarm, itime))
Scott Woodbf4994d2007-10-16 01:28:19 -0700250 new_alarm = 1;
Roel Kluinfa7af8b2009-03-31 15:25:00 -0700251 else
252 new_alarm -= itime;
Scott Woodbf4994d2007-10-16 01:28:19 -0700253
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
279out:
280 mutex_unlock(&ds1374->mutex);
281 return ret;
282}
Søren Andersen920f91e2014-12-10 15:53:54 -0800283#endif
Scott Woodbf4994d2007-10-16 01:28:19 -0700284
285static 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
295static 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)
Jiri Slaby28df30e2009-07-05 12:08:03 -0700305 goto unlock;
Scott Woodbf4994d2007-10-16 01:28:19 -0700306
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
Scott Woodbf4994d2007-10-16 01:28:19 -0700318 rtc_update_irq(ds1374->rtc, 1, RTC_AF | RTC_IRQF);
Scott Woodbf4994d2007-10-16 01:28:19 -0700319 }
320
321out:
322 if (!ds1374->exiting)
323 enable_irq(client->irq);
Jiri Slaby28df30e2009-07-05 12:08:03 -0700324unlock:
Scott Woodbf4994d2007-10-16 01:28:19 -0700325 mutex_unlock(&ds1374->mutex);
326}
327
Søren Andersen920f91e2014-12-10 15:53:54 -0800328#ifndef CONFIG_RTC_DRV_DS1374_WDT
John Stultz16380c12011-02-02 17:02:41 -0800329static int ds1374_alarm_irq_enable(struct device *dev, unsigned int enabled)
Scott Woodbf4994d2007-10-16 01:28:19 -0700330{
331 struct i2c_client *client = to_i2c_client(dev);
332 struct ds1374 *ds1374 = i2c_get_clientdata(client);
John Stultz16380c12011-02-02 17:02:41 -0800333 int ret;
Scott Woodbf4994d2007-10-16 01:28:19 -0700334
335 mutex_lock(&ds1374->mutex);
336
John Stultz16380c12011-02-02 17:02:41 -0800337 ret = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
338 if (ret < 0)
339 goto out;
Scott Woodbf4994d2007-10-16 01:28:19 -0700340
John Stultz16380c12011-02-02 17:02:41 -0800341 if (enabled) {
Scott Woodbf4994d2007-10-16 01:28:19 -0700342 ret |= DS1374_REG_CR_WACE | DS1374_REG_CR_AIE;
343 ret &= ~DS1374_REG_CR_WDALM;
John Stultz16380c12011-02-02 17:02:41 -0800344 } else {
345 ret &= ~DS1374_REG_CR_WACE;
Scott Woodbf4994d2007-10-16 01:28:19 -0700346 }
John Stultz16380c12011-02-02 17:02:41 -0800347 ret = i2c_smbus_write_byte_data(client, DS1374_REG_CR, ret);
Scott Woodbf4994d2007-10-16 01:28:19 -0700348
349out:
350 mutex_unlock(&ds1374->mutex);
351 return ret;
352}
Søren Andersen920f91e2014-12-10 15:53:54 -0800353#endif
Scott Woodbf4994d2007-10-16 01:28:19 -0700354
355static const struct rtc_class_ops ds1374_rtc_ops = {
356 .read_time = ds1374_read_time,
357 .set_time = ds1374_set_time,
Søren Andersen920f91e2014-12-10 15:53:54 -0800358#ifndef CONFIG_RTC_DRV_DS1374_WDT
Scott Woodbf4994d2007-10-16 01:28:19 -0700359 .read_alarm = ds1374_read_alarm,
360 .set_alarm = ds1374_set_alarm,
John Stultz16380c12011-02-02 17:02:41 -0800361 .alarm_irq_enable = ds1374_alarm_irq_enable,
Søren Andersen920f91e2014-12-10 15:53:54 -0800362#endif
Scott Woodbf4994d2007-10-16 01:28:19 -0700363};
364
Søren Andersen920f91e2014-12-10 15:53:54 -0800365#ifdef CONFIG_RTC_DRV_DS1374_WDT
366/*
367 *****************************************************************************
368 *
369 * Watchdog Driver
370 *
371 *****************************************************************************
372 */
373static struct i2c_client *save_client;
374/* Default margin */
375#define WD_TIMO 131762
376
377#define DRV_NAME "DS1374 Watchdog"
378
379static int wdt_margin = WD_TIMO;
380static unsigned long wdt_is_open;
381module_param(wdt_margin, int, 0);
382MODULE_PARM_DESC(wdt_margin, "Watchdog timeout in seconds (default 32s)");
383
384static const struct watchdog_info ds1374_wdt_info = {
385 .identity = "DS1374 WTD",
386 .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
387 WDIOF_MAGICCLOSE,
388};
389
390static 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("rtc-ds1374 - 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;
422out:
423 return ret;
424}
425
426
427/*
428 * Reload the watchdog timer. (ie, pat the watchdog)
429 */
430static 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
440static void ds1374_wdt_disable(void)
441{
442 int ret = -ENOIOCTLCMD;
443 int cr;
444
445 cr = i2c_smbus_read_byte_data(save_client, DS1374_REG_CR);
446 /* Disable watchdog timer */
447 cr &= ~DS1374_REG_CR_WACE;
448
449 ret = i2c_smbus_write_byte_data(save_client, DS1374_REG_CR, cr);
450}
451
452/*
453 * Watchdog device is opened, and watchdog starts running.
454 */
455static int ds1374_wdt_open(struct inode *inode, struct file *file)
456{
457 struct ds1374 *ds1374 = i2c_get_clientdata(save_client);
458
459 if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) {
460 mutex_lock(&ds1374->mutex);
461 if (test_and_set_bit(0, &wdt_is_open)) {
462 mutex_unlock(&ds1374->mutex);
463 return -EBUSY;
464 }
465 /*
466 * Activate
467 */
468 wdt_is_open = 1;
469 mutex_unlock(&ds1374->mutex);
470 return nonseekable_open(inode, file);
471 }
472 return -ENODEV;
473}
474
475/*
476 * Close the watchdog device.
477 */
478static int ds1374_wdt_release(struct inode *inode, struct file *file)
479{
480 if (MINOR(inode->i_rdev) == WATCHDOG_MINOR)
481 clear_bit(0, &wdt_is_open);
482
483 return 0;
484}
485
486/*
487 * Pat the watchdog whenever device is written to.
488 */
489static ssize_t ds1374_wdt_write(struct file *file, const char __user *data,
490 size_t len, loff_t *ppos)
491{
492 if (len) {
493 ds1374_wdt_ping();
494 return 1;
495 }
496 return 0;
497}
498
499static ssize_t ds1374_wdt_read(struct file *file, char __user *data,
500 size_t len, loff_t *ppos)
501{
502 return 0;
503}
504
505/*
506 * Handle commands from user-space.
507 */
508static long ds1374_wdt_ioctl(struct file *file, unsigned int cmd,
509 unsigned long arg)
510{
511 int new_margin, options;
512
513 switch (cmd) {
514 case WDIOC_GETSUPPORT:
515 return copy_to_user((struct watchdog_info __user *)arg,
516 &ds1374_wdt_info, sizeof(ds1374_wdt_info)) ? -EFAULT : 0;
517
518 case WDIOC_GETSTATUS:
519 case WDIOC_GETBOOTSTATUS:
520 return put_user(0, (int __user *)arg);
521 case WDIOC_KEEPALIVE:
522 ds1374_wdt_ping();
523 return 0;
524 case WDIOC_SETTIMEOUT:
525 if (get_user(new_margin, (int __user *)arg))
526 return -EFAULT;
527
528 if (new_margin < 1 || new_margin > 16777216)
529 return -EINVAL;
530
531 wdt_margin = new_margin;
532 ds1374_wdt_settimeout(new_margin);
533 ds1374_wdt_ping();
534 /* fallthrough */
535 case WDIOC_GETTIMEOUT:
536 return put_user(wdt_margin, (int __user *)arg);
537 case WDIOC_SETOPTIONS:
538 if (copy_from_user(&options, (int __user *)arg, sizeof(int)))
539 return -EFAULT;
540
541 if (options & WDIOS_DISABLECARD) {
542 pr_info("rtc-ds1374: disable watchdog\n");
543 ds1374_wdt_disable();
544 }
545
546 if (options & WDIOS_ENABLECARD) {
547 pr_info("rtc-ds1374: enable watchdog\n");
548 ds1374_wdt_settimeout(wdt_margin);
549 ds1374_wdt_ping();
550 }
551
552 return -EINVAL;
553 }
554 return -ENOTTY;
555}
556
557static long ds1374_wdt_unlocked_ioctl(struct file *file, unsigned int cmd,
558 unsigned long arg)
559{
560 int ret;
561 struct ds1374 *ds1374 = i2c_get_clientdata(save_client);
562
563 mutex_lock(&ds1374->mutex);
564 ret = ds1374_wdt_ioctl(file, cmd, arg);
565 mutex_unlock(&ds1374->mutex);
566
567 return ret;
568}
569
570static int ds1374_wdt_notify_sys(struct notifier_block *this,
571 unsigned long code, void *unused)
572{
573 if (code == SYS_DOWN || code == SYS_HALT)
574 /* Disable Watchdog */
575 ds1374_wdt_disable();
576 return NOTIFY_DONE;
577}
578
579static const struct file_operations ds1374_wdt_fops = {
580 .owner = THIS_MODULE,
581 .read = ds1374_wdt_read,
582 .unlocked_ioctl = ds1374_wdt_unlocked_ioctl,
583 .write = ds1374_wdt_write,
584 .open = ds1374_wdt_open,
585 .release = ds1374_wdt_release,
586 .llseek = no_llseek,
587};
588
589static struct miscdevice ds1374_miscdev = {
590 .minor = WATCHDOG_MINOR,
591 .name = "watchdog",
592 .fops = &ds1374_wdt_fops,
593};
594
595static struct notifier_block ds1374_wdt_notifier = {
596 .notifier_call = ds1374_wdt_notify_sys,
597};
598
599#endif /*CONFIG_RTC_DRV_DS1374_WDT*/
600/*
601 *****************************************************************************
602 *
603 * Driver Interface
604 *
605 *****************************************************************************
606 */
Jean Delvared2653e92008-04-29 23:11:39 +0200607static int ds1374_probe(struct i2c_client *client,
608 const struct i2c_device_id *id)
Scott Woodbf4994d2007-10-16 01:28:19 -0700609{
610 struct ds1374 *ds1374;
611 int ret;
612
Sachin Kamatd1a96632013-04-29 16:20:30 -0700613 ds1374 = devm_kzalloc(&client->dev, sizeof(struct ds1374), GFP_KERNEL);
Scott Woodbf4994d2007-10-16 01:28:19 -0700614 if (!ds1374)
615 return -ENOMEM;
616
617 ds1374->client = client;
618 i2c_set_clientdata(client, ds1374);
619
620 INIT_WORK(&ds1374->work, ds1374_work);
621 mutex_init(&ds1374->mutex);
622
623 ret = ds1374_check_rtc_status(client);
624 if (ret)
Sachin Kamatd1a96632013-04-29 16:20:30 -0700625 return ret;
Scott Woodbf4994d2007-10-16 01:28:19 -0700626
Anton Vorontsovb42f9312008-08-20 14:09:21 -0700627 if (client->irq > 0) {
Sachin Kamatd1a96632013-04-29 16:20:30 -0700628 ret = devm_request_irq(&client->dev, client->irq, ds1374_irq, 0,
Sachin Kamatadc7b9b2013-07-03 15:05:48 -0700629 "ds1374", client);
Scott Woodbf4994d2007-10-16 01:28:19 -0700630 if (ret) {
631 dev_err(&client->dev, "unable to request IRQ\n");
Sachin Kamatd1a96632013-04-29 16:20:30 -0700632 return ret;
Scott Woodbf4994d2007-10-16 01:28:19 -0700633 }
Anton Vorontsov26b3c012009-12-17 15:27:23 -0800634
635 device_set_wakeup_capable(&client->dev, 1);
Scott Woodbf4994d2007-10-16 01:28:19 -0700636 }
637
Sachin Kamatd1a96632013-04-29 16:20:30 -0700638 ds1374->rtc = devm_rtc_device_register(&client->dev, client->name,
Sachin Kamatadc7b9b2013-07-03 15:05:48 -0700639 &ds1374_rtc_ops, THIS_MODULE);
Scott Woodbf4994d2007-10-16 01:28:19 -0700640 if (IS_ERR(ds1374->rtc)) {
Scott Woodbf4994d2007-10-16 01:28:19 -0700641 dev_err(&client->dev, "unable to register the class device\n");
Sachin Kamatd1a96632013-04-29 16:20:30 -0700642 return PTR_ERR(ds1374->rtc);
Scott Woodbf4994d2007-10-16 01:28:19 -0700643 }
644
Søren Andersen920f91e2014-12-10 15:53:54 -0800645#ifdef CONFIG_RTC_DRV_DS1374_WDT
646 save_client = client;
647 ret = misc_register(&ds1374_miscdev);
648 if (ret)
649 return ret;
650 ret = register_reboot_notifier(&ds1374_wdt_notifier);
651 if (ret) {
652 misc_deregister(&ds1374_miscdev);
653 return ret;
654 }
655 ds1374_wdt_settimeout(131072);
656#endif
657
Scott Woodbf4994d2007-10-16 01:28:19 -0700658 return 0;
Scott Woodbf4994d2007-10-16 01:28:19 -0700659}
660
Greg Kroah-Hartman5a167f42012-12-21 13:09:38 -0800661static int ds1374_remove(struct i2c_client *client)
Scott Woodbf4994d2007-10-16 01:28:19 -0700662{
663 struct ds1374 *ds1374 = i2c_get_clientdata(client);
Søren Andersen920f91e2014-12-10 15:53:54 -0800664#ifdef CONFIG_RTC_DRV_DS1374_WDT
665 int res;
666
667 res = misc_deregister(&ds1374_miscdev);
668 if (!res)
669 ds1374_miscdev.parent = NULL;
670 unregister_reboot_notifier(&ds1374_wdt_notifier);
671#endif
Scott Woodbf4994d2007-10-16 01:28:19 -0700672
Anton Vorontsovb42f9312008-08-20 14:09:21 -0700673 if (client->irq > 0) {
Scott Woodbf4994d2007-10-16 01:28:19 -0700674 mutex_lock(&ds1374->mutex);
675 ds1374->exiting = 1;
676 mutex_unlock(&ds1374->mutex);
677
Sachin Kamatd1a96632013-04-29 16:20:30 -0700678 devm_free_irq(&client->dev, client->irq, client);
Tejun Heo9db89952010-12-24 16:00:17 +0100679 cancel_work_sync(&ds1374->work);
Scott Woodbf4994d2007-10-16 01:28:19 -0700680 }
681
Scott Woodbf4994d2007-10-16 01:28:19 -0700682 return 0;
683}
684
Jingoo Han8b80ef62013-04-29 16:20:07 -0700685#ifdef CONFIG_PM_SLEEP
Mark Brownbc96ba72011-03-22 16:34:52 -0700686static int ds1374_suspend(struct device *dev)
Marc Pignat986e36a2008-10-15 22:02:56 -0700687{
Mark Brownbc96ba72011-03-22 16:34:52 -0700688 struct i2c_client *client = to_i2c_client(dev);
689
Marc Pignat986e36a2008-10-15 22:02:56 -0700690 if (client->irq >= 0 && device_may_wakeup(&client->dev))
691 enable_irq_wake(client->irq);
692 return 0;
693}
694
Mark Brownbc96ba72011-03-22 16:34:52 -0700695static int ds1374_resume(struct device *dev)
Marc Pignat986e36a2008-10-15 22:02:56 -0700696{
Mark Brownbc96ba72011-03-22 16:34:52 -0700697 struct i2c_client *client = to_i2c_client(dev);
698
Marc Pignat986e36a2008-10-15 22:02:56 -0700699 if (client->irq >= 0 && device_may_wakeup(&client->dev))
700 disable_irq_wake(client->irq);
701 return 0;
702}
Jingoo Han8b80ef62013-04-29 16:20:07 -0700703#endif
Mark Brownbc96ba72011-03-22 16:34:52 -0700704
705static SIMPLE_DEV_PM_OPS(ds1374_pm, ds1374_suspend, ds1374_resume);
706
Scott Woodbf4994d2007-10-16 01:28:19 -0700707static struct i2c_driver ds1374_driver = {
708 .driver = {
709 .name = "rtc-ds1374",
710 .owner = THIS_MODULE,
Jingoo Han8b80ef62013-04-29 16:20:07 -0700711 .pm = &ds1374_pm,
Scott Woodbf4994d2007-10-16 01:28:19 -0700712 },
713 .probe = ds1374_probe,
Greg Kroah-Hartman5a167f42012-12-21 13:09:38 -0800714 .remove = ds1374_remove,
Jean Delvare3760f732008-04-29 23:11:40 +0200715 .id_table = ds1374_id,
Scott Woodbf4994d2007-10-16 01:28:19 -0700716};
717
Axel Lin0abc9202012-03-23 15:02:31 -0700718module_i2c_driver(ds1374_driver);
Scott Woodbf4994d2007-10-16 01:28:19 -0700719
720MODULE_AUTHOR("Scott Wood <scottwood@freescale.com>");
721MODULE_DESCRIPTION("Maxim/Dallas DS1374 RTC Driver");
722MODULE_LICENSE("GPL");