blob: c0eb113588ff9313b167314c00c4f6cbbfe0c6aa [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
Joe Perchesa737e832015-04-16 12:46:14 -070021#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
Scott Woodbf4994d2007-10-16 01:28:19 -070023#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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090030#include <linux/slab.h>
Mark Brownbc96ba72011-03-22 16:34:52 -070031#include <linux/pm.h>
Søren Andersen920f91e2014-12-10 15:53:54 -080032#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
Scott Woodbf4994d2007-10-16 01:28:19 -070039
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
Jean Delvare3760f732008-04-29 23:11:40 +020056static const struct i2c_device_id ds1374_id[] = {
Jean Delvaref2eb4322008-06-05 22:46:18 -070057 { "ds1374", 0 },
Jean Delvare3760f732008-04-29 23:11:40 +020058 { }
59};
60MODULE_DEVICE_TABLE(i2c, ds1374_id);
61
Søren Andersen920f91e2014-12-10 15:53:54 -080062#ifdef CONFIG_OF
63static const struct of_device_id ds1374_of_match[] = {
64 { .compatible = "dallas,ds1374" },
65 { }
66};
67MODULE_DEVICE_TABLE(of, ds1374_of_match);
68#endif
69
Scott Woodbf4994d2007-10-16 01:28:19 -070070struct 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
83static struct i2c_driver ds1374_driver;
84
85static int ds1374_read_rtc(struct i2c_client *client, u32 *time,
Sachin Kamatadc7b9b2013-07-03 15:05:48 -070086 int reg, int nbytes)
Scott Woodbf4994d2007-10-16 01:28:19 -070087{
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
110static int ds1374_write_rtc(struct i2c_client *client, u32 time,
Sachin Kamatadc7b9b2013-07-03 15:05:48 -0700111 int reg, int nbytes)
Scott Woodbf4994d2007-10-16 01:28:19 -0700112{
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
129static 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,
Sachin Kamatadc7b9b2013-07-03 15:05:48 -0700140 "oscillator discontinuity flagged, time unreliable\n");
Scott Woodbf4994d2007-10-16 01:28:19 -0700141
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
161static 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
174static 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
Søren Andersen920f91e2014-12-10 15:53:54 -0800183#ifndef CONFIG_RTC_DRV_DS1374_WDT
Scott Woodbf4994d2007-10-16 01:28:19 -0700184/* 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 */
188static 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
Anton Vorontsovb42f9312008-08-20 14:09:21 -0700196 if (client->irq <= 0)
Scott Woodbf4994d2007-10-16 01:28:19 -0700197 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
221out:
222 mutex_unlock(&ds1374->mutex);
223 return ret;
224}
225
226static 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
Anton Vorontsovb42f9312008-08-20 14:09:21 -0700235 if (client->irq <= 0)
Scott Woodbf4994d2007-10-16 01:28:19 -0700236 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
Scott Woodbf4994d2007-10-16 01:28:19 -0700245 /* 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 */
Roel Kluinfa7af8b2009-03-31 15:25:00 -0700251 if (time_before_eq(new_alarm, itime))
Scott Woodbf4994d2007-10-16 01:28:19 -0700252 new_alarm = 1;
Roel Kluinfa7af8b2009-03-31 15:25:00 -0700253 else
254 new_alarm -= itime;
Scott Woodbf4994d2007-10-16 01:28:19 -0700255
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
281out:
282 mutex_unlock(&ds1374->mutex);
283 return ret;
284}
Søren Andersen920f91e2014-12-10 15:53:54 -0800285#endif
Scott Woodbf4994d2007-10-16 01:28:19 -0700286
287static 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
297static 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)
Jiri Slaby28df30e2009-07-05 12:08:03 -0700307 goto unlock;
Scott Woodbf4994d2007-10-16 01:28:19 -0700308
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
Scott Woodbf4994d2007-10-16 01:28:19 -0700320 rtc_update_irq(ds1374->rtc, 1, RTC_AF | RTC_IRQF);
Scott Woodbf4994d2007-10-16 01:28:19 -0700321 }
322
323out:
324 if (!ds1374->exiting)
325 enable_irq(client->irq);
Jiri Slaby28df30e2009-07-05 12:08:03 -0700326unlock:
Scott Woodbf4994d2007-10-16 01:28:19 -0700327 mutex_unlock(&ds1374->mutex);
328}
329
Søren Andersen920f91e2014-12-10 15:53:54 -0800330#ifndef CONFIG_RTC_DRV_DS1374_WDT
John Stultz16380c12011-02-02 17:02:41 -0800331static int ds1374_alarm_irq_enable(struct device *dev, unsigned int enabled)
Scott Woodbf4994d2007-10-16 01:28:19 -0700332{
333 struct i2c_client *client = to_i2c_client(dev);
334 struct ds1374 *ds1374 = i2c_get_clientdata(client);
John Stultz16380c12011-02-02 17:02:41 -0800335 int ret;
Scott Woodbf4994d2007-10-16 01:28:19 -0700336
337 mutex_lock(&ds1374->mutex);
338
John Stultz16380c12011-02-02 17:02:41 -0800339 ret = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
340 if (ret < 0)
341 goto out;
Scott Woodbf4994d2007-10-16 01:28:19 -0700342
John Stultz16380c12011-02-02 17:02:41 -0800343 if (enabled) {
Scott Woodbf4994d2007-10-16 01:28:19 -0700344 ret |= DS1374_REG_CR_WACE | DS1374_REG_CR_AIE;
345 ret &= ~DS1374_REG_CR_WDALM;
John Stultz16380c12011-02-02 17:02:41 -0800346 } else {
347 ret &= ~DS1374_REG_CR_WACE;
Scott Woodbf4994d2007-10-16 01:28:19 -0700348 }
John Stultz16380c12011-02-02 17:02:41 -0800349 ret = i2c_smbus_write_byte_data(client, DS1374_REG_CR, ret);
Scott Woodbf4994d2007-10-16 01:28:19 -0700350
351out:
352 mutex_unlock(&ds1374->mutex);
353 return ret;
354}
Søren Andersen920f91e2014-12-10 15:53:54 -0800355#endif
Scott Woodbf4994d2007-10-16 01:28:19 -0700356
357static const struct rtc_class_ops ds1374_rtc_ops = {
358 .read_time = ds1374_read_time,
359 .set_time = ds1374_set_time,
Søren Andersen920f91e2014-12-10 15:53:54 -0800360#ifndef CONFIG_RTC_DRV_DS1374_WDT
Scott Woodbf4994d2007-10-16 01:28:19 -0700361 .read_alarm = ds1374_read_alarm,
362 .set_alarm = ds1374_set_alarm,
John Stultz16380c12011-02-02 17:02:41 -0800363 .alarm_irq_enable = ds1374_alarm_irq_enable,
Søren Andersen920f91e2014-12-10 15:53:54 -0800364#endif
Scott Woodbf4994d2007-10-16 01:28:19 -0700365};
366
Søren Andersen920f91e2014-12-10 15:53:54 -0800367#ifdef CONFIG_RTC_DRV_DS1374_WDT
368/*
369 *****************************************************************************
370 *
371 * Watchdog Driver
372 *
373 *****************************************************************************
374 */
375static struct i2c_client *save_client;
376/* Default margin */
377#define WD_TIMO 131762
378
379#define DRV_NAME "DS1374 Watchdog"
380
381static int wdt_margin = WD_TIMO;
382static unsigned long wdt_is_open;
383module_param(wdt_margin, int, 0);
384MODULE_PARM_DESC(wdt_margin, "Watchdog timeout in seconds (default 32s)");
385
386static const struct watchdog_info ds1374_wdt_info = {
387 .identity = "DS1374 WTD",
388 .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
389 WDIOF_MAGICCLOSE,
390};
391
392static 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) {
Joe Perchesa737e832015-04-16 12:46:14 -0700411 pr_info("couldn't set new watchdog time\n");
Søren Andersen920f91e2014-12-10 15:53:54 -0800412 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;
424out:
425 return ret;
426}
427
428
429/*
430 * Reload the watchdog timer. (ie, pat the watchdog)
431 */
432static 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
442static 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 */
457static 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 */
480static 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 */
491static 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
501static 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 */
510static 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
Moritz Fischera06dfdb2017-04-24 15:05:11 -0700530 /* the hardware's tick rate is 4096 Hz, so
531 * the counter value needs to be scaled accordingly
532 */
533 new_margin <<= 12;
Søren Andersen920f91e2014-12-10 15:53:54 -0800534 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:
Moritz Fischera06dfdb2017-04-24 15:05:11 -0700542 /* when returning ... inverse is true */
543 return put_user((wdt_margin >> 12), (int __user *)arg);
Søren Andersen920f91e2014-12-10 15:53:54 -0800544 case WDIOC_SETOPTIONS:
545 if (copy_from_user(&options, (int __user *)arg, sizeof(int)))
546 return -EFAULT;
547
548 if (options & WDIOS_DISABLECARD) {
Joe Perchesa737e832015-04-16 12:46:14 -0700549 pr_info("disable watchdog\n");
Søren Andersen920f91e2014-12-10 15:53:54 -0800550 ds1374_wdt_disable();
Moritz Fischer0e37c9f2017-04-24 15:05:12 -0700551 return 0;
Søren Andersen920f91e2014-12-10 15:53:54 -0800552 }
553
554 if (options & WDIOS_ENABLECARD) {
Joe Perchesa737e832015-04-16 12:46:14 -0700555 pr_info("enable watchdog\n");
Søren Andersen920f91e2014-12-10 15:53:54 -0800556 ds1374_wdt_settimeout(wdt_margin);
557 ds1374_wdt_ping();
Moritz Fischer0e37c9f2017-04-24 15:05:12 -0700558 return 0;
Søren Andersen920f91e2014-12-10 15:53:54 -0800559 }
Søren Andersen920f91e2014-12-10 15:53:54 -0800560 return -EINVAL;
561 }
562 return -ENOTTY;
563}
564
565static 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
578static 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
587static 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
597static struct miscdevice ds1374_miscdev = {
598 .minor = WATCHDOG_MINOR,
599 .name = "watchdog",
600 .fops = &ds1374_wdt_fops,
601};
602
603static 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 */
Jean Delvared2653e92008-04-29 23:11:39 +0200615static int ds1374_probe(struct i2c_client *client,
616 const struct i2c_device_id *id)
Scott Woodbf4994d2007-10-16 01:28:19 -0700617{
618 struct ds1374 *ds1374;
619 int ret;
620
Sachin Kamatd1a96632013-04-29 16:20:30 -0700621 ds1374 = devm_kzalloc(&client->dev, sizeof(struct ds1374), GFP_KERNEL);
Scott Woodbf4994d2007-10-16 01:28:19 -0700622 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)
Sachin Kamatd1a96632013-04-29 16:20:30 -0700633 return ret;
Scott Woodbf4994d2007-10-16 01:28:19 -0700634
Anton Vorontsovb42f9312008-08-20 14:09:21 -0700635 if (client->irq > 0) {
Sachin Kamatd1a96632013-04-29 16:20:30 -0700636 ret = devm_request_irq(&client->dev, client->irq, ds1374_irq, 0,
Sachin Kamatadc7b9b2013-07-03 15:05:48 -0700637 "ds1374", client);
Scott Woodbf4994d2007-10-16 01:28:19 -0700638 if (ret) {
639 dev_err(&client->dev, "unable to request IRQ\n");
Sachin Kamatd1a96632013-04-29 16:20:30 -0700640 return ret;
Scott Woodbf4994d2007-10-16 01:28:19 -0700641 }
Anton Vorontsov26b3c012009-12-17 15:27:23 -0800642
643 device_set_wakeup_capable(&client->dev, 1);
Scott Woodbf4994d2007-10-16 01:28:19 -0700644 }
645
Sachin Kamatd1a96632013-04-29 16:20:30 -0700646 ds1374->rtc = devm_rtc_device_register(&client->dev, client->name,
Sachin Kamatadc7b9b2013-07-03 15:05:48 -0700647 &ds1374_rtc_ops, THIS_MODULE);
Scott Woodbf4994d2007-10-16 01:28:19 -0700648 if (IS_ERR(ds1374->rtc)) {
Scott Woodbf4994d2007-10-16 01:28:19 -0700649 dev_err(&client->dev, "unable to register the class device\n");
Sachin Kamatd1a96632013-04-29 16:20:30 -0700650 return PTR_ERR(ds1374->rtc);
Scott Woodbf4994d2007-10-16 01:28:19 -0700651 }
652
Søren Andersen920f91e2014-12-10 15:53:54 -0800653#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
Scott Woodbf4994d2007-10-16 01:28:19 -0700666 return 0;
Scott Woodbf4994d2007-10-16 01:28:19 -0700667}
668
Greg Kroah-Hartman5a167f42012-12-21 13:09:38 -0800669static int ds1374_remove(struct i2c_client *client)
Scott Woodbf4994d2007-10-16 01:28:19 -0700670{
671 struct ds1374 *ds1374 = i2c_get_clientdata(client);
Søren Andersen920f91e2014-12-10 15:53:54 -0800672#ifdef CONFIG_RTC_DRV_DS1374_WDT
Greg Kroah-Hartmanf368ed62015-07-30 15:59:57 -0700673 misc_deregister(&ds1374_miscdev);
674 ds1374_miscdev.parent = NULL;
Søren Andersen920f91e2014-12-10 15:53:54 -0800675 unregister_reboot_notifier(&ds1374_wdt_notifier);
676#endif
Scott Woodbf4994d2007-10-16 01:28:19 -0700677
Anton Vorontsovb42f9312008-08-20 14:09:21 -0700678 if (client->irq > 0) {
Scott Woodbf4994d2007-10-16 01:28:19 -0700679 mutex_lock(&ds1374->mutex);
680 ds1374->exiting = 1;
681 mutex_unlock(&ds1374->mutex);
682
Sachin Kamatd1a96632013-04-29 16:20:30 -0700683 devm_free_irq(&client->dev, client->irq, client);
Tejun Heo9db89952010-12-24 16:00:17 +0100684 cancel_work_sync(&ds1374->work);
Scott Woodbf4994d2007-10-16 01:28:19 -0700685 }
686
Scott Woodbf4994d2007-10-16 01:28:19 -0700687 return 0;
688}
689
Jingoo Han8b80ef62013-04-29 16:20:07 -0700690#ifdef CONFIG_PM_SLEEP
Mark Brownbc96ba72011-03-22 16:34:52 -0700691static int ds1374_suspend(struct device *dev)
Marc Pignat986e36a2008-10-15 22:02:56 -0700692{
Mark Brownbc96ba72011-03-22 16:34:52 -0700693 struct i2c_client *client = to_i2c_client(dev);
694
Octavian Purdila0d9030a2015-06-05 16:59:43 +0300695 if (client->irq > 0 && device_may_wakeup(&client->dev))
Marc Pignat986e36a2008-10-15 22:02:56 -0700696 enable_irq_wake(client->irq);
697 return 0;
698}
699
Mark Brownbc96ba72011-03-22 16:34:52 -0700700static int ds1374_resume(struct device *dev)
Marc Pignat986e36a2008-10-15 22:02:56 -0700701{
Mark Brownbc96ba72011-03-22 16:34:52 -0700702 struct i2c_client *client = to_i2c_client(dev);
703
Octavian Purdila0d9030a2015-06-05 16:59:43 +0300704 if (client->irq > 0 && device_may_wakeup(&client->dev))
Marc Pignat986e36a2008-10-15 22:02:56 -0700705 disable_irq_wake(client->irq);
706 return 0;
707}
Jingoo Han8b80ef62013-04-29 16:20:07 -0700708#endif
Mark Brownbc96ba72011-03-22 16:34:52 -0700709
710static SIMPLE_DEV_PM_OPS(ds1374_pm, ds1374_suspend, ds1374_resume);
711
Scott Woodbf4994d2007-10-16 01:28:19 -0700712static struct i2c_driver ds1374_driver = {
713 .driver = {
714 .name = "rtc-ds1374",
Jingoo Han8b80ef62013-04-29 16:20:07 -0700715 .pm = &ds1374_pm,
Scott Woodbf4994d2007-10-16 01:28:19 -0700716 },
717 .probe = ds1374_probe,
Greg Kroah-Hartman5a167f42012-12-21 13:09:38 -0800718 .remove = ds1374_remove,
Jean Delvare3760f732008-04-29 23:11:40 +0200719 .id_table = ds1374_id,
Scott Woodbf4994d2007-10-16 01:28:19 -0700720};
721
Axel Lin0abc9202012-03-23 15:02:31 -0700722module_i2c_driver(ds1374_driver);
Scott Woodbf4994d2007-10-16 01:28:19 -0700723
724MODULE_AUTHOR("Scott Wood <scottwood@freescale.com>");
725MODULE_DESCRIPTION("Maxim/Dallas DS1374 RTC Driver");
726MODULE_LICENSE("GPL");