2007-10-16 12:28:19 +04:00
|
|
|
/*
|
|
|
|
* RTC client/driver for the Maxim/Dallas DS1374 Real-Time Clock over I2C
|
|
|
|
*
|
|
|
|
* Based on code by Randy Vinson <rvinson@mvista.com>,
|
|
|
|
* which was based on the m41t00.c by Mark Greer <mgreer@mvista.com>.
|
|
|
|
*
|
2014-12-11 02:53:54 +03:00
|
|
|
* Copyright (C) 2014 Rose Technology
|
2007-10-16 12:28:19 +04:00
|
|
|
* Copyright (C) 2006-2007 Freescale Semiconductor
|
|
|
|
*
|
|
|
|
* 2005 (c) MontaVista Software, Inc. This file is licensed under
|
|
|
|
* the terms of the GNU General Public License version 2. This program
|
|
|
|
* is licensed "as is" without any warranty of any kind, whether express
|
|
|
|
* or implied.
|
|
|
|
*/
|
|
|
|
/*
|
|
|
|
* It would be more efficient to use i2c msgs/i2c_transfer directly but, as
|
|
|
|
* recommened in .../Documentation/i2c/writing-clients section
|
|
|
|
* "Sending and receiving", using SMBus level communication is preferred.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/interrupt.h>
|
|
|
|
#include <linux/i2c.h>
|
|
|
|
#include <linux/rtc.h>
|
|
|
|
#include <linux/bcd.h>
|
|
|
|
#include <linux/workqueue.h>
|
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 11:04:11 +03:00
|
|
|
#include <linux/slab.h>
|
2011-03-23 02:34:52 +03:00
|
|
|
#include <linux/pm.h>
|
2014-12-11 02:53:54 +03:00
|
|
|
#ifdef CONFIG_RTC_DRV_DS1374_WDT
|
|
|
|
#include <linux/fs.h>
|
|
|
|
#include <linux/ioctl.h>
|
|
|
|
#include <linux/miscdevice.h>
|
|
|
|
#include <linux/reboot.h>
|
|
|
|
#include <linux/watchdog.h>
|
|
|
|
#endif
|
2007-10-16 12:28:19 +04:00
|
|
|
|
|
|
|
#define DS1374_REG_TOD0 0x00 /* Time of Day */
|
|
|
|
#define DS1374_REG_TOD1 0x01
|
|
|
|
#define DS1374_REG_TOD2 0x02
|
|
|
|
#define DS1374_REG_TOD3 0x03
|
|
|
|
#define DS1374_REG_WDALM0 0x04 /* Watchdog/Alarm */
|
|
|
|
#define DS1374_REG_WDALM1 0x05
|
|
|
|
#define DS1374_REG_WDALM2 0x06
|
|
|
|
#define DS1374_REG_CR 0x07 /* Control */
|
|
|
|
#define DS1374_REG_CR_AIE 0x01 /* Alarm Int. Enable */
|
|
|
|
#define DS1374_REG_CR_WDALM 0x20 /* 1=Watchdog, 0=Alarm */
|
|
|
|
#define DS1374_REG_CR_WACE 0x40 /* WD/Alarm counter enable */
|
|
|
|
#define DS1374_REG_SR 0x08 /* Status */
|
|
|
|
#define DS1374_REG_SR_OSF 0x80 /* Oscillator Stop Flag */
|
|
|
|
#define DS1374_REG_SR_AF 0x01 /* Alarm Flag */
|
|
|
|
#define DS1374_REG_TCR 0x09 /* Trickle Charge */
|
|
|
|
|
2008-04-30 01:11:40 +04:00
|
|
|
static const struct i2c_device_id ds1374_id[] = {
|
2008-06-06 09:46:18 +04:00
|
|
|
{ "ds1374", 0 },
|
2008-04-30 01:11:40 +04:00
|
|
|
{ }
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, ds1374_id);
|
|
|
|
|
2014-12-11 02:53:54 +03:00
|
|
|
#ifdef CONFIG_OF
|
|
|
|
static const struct of_device_id ds1374_of_match[] = {
|
|
|
|
{ .compatible = "dallas,ds1374" },
|
|
|
|
{ }
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, ds1374_of_match);
|
|
|
|
#endif
|
|
|
|
|
2007-10-16 12:28:19 +04:00
|
|
|
struct ds1374 {
|
|
|
|
struct i2c_client *client;
|
|
|
|
struct rtc_device *rtc;
|
|
|
|
struct work_struct work;
|
|
|
|
|
|
|
|
/* The mutex protects alarm operations, and prevents a race
|
|
|
|
* between the enable_irq() in the workqueue and the free_irq()
|
|
|
|
* in the remove function.
|
|
|
|
*/
|
|
|
|
struct mutex mutex;
|
|
|
|
int exiting;
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct i2c_driver ds1374_driver;
|
|
|
|
|
|
|
|
static int ds1374_read_rtc(struct i2c_client *client, u32 *time,
|
2013-07-04 02:05:48 +04:00
|
|
|
int reg, int nbytes)
|
2007-10-16 12:28:19 +04:00
|
|
|
{
|
|
|
|
u8 buf[4];
|
|
|
|
int ret;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
if (nbytes > 4) {
|
|
|
|
WARN_ON(1);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = i2c_smbus_read_i2c_block_data(client, reg, nbytes, buf);
|
|
|
|
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
if (ret < nbytes)
|
|
|
|
return -EIO;
|
|
|
|
|
|
|
|
for (i = nbytes - 1, *time = 0; i >= 0; i--)
|
|
|
|
*time = (*time << 8) | buf[i];
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int ds1374_write_rtc(struct i2c_client *client, u32 time,
|
2013-07-04 02:05:48 +04:00
|
|
|
int reg, int nbytes)
|
2007-10-16 12:28:19 +04:00
|
|
|
{
|
|
|
|
u8 buf[4];
|
|
|
|
int i;
|
|
|
|
|
|
|
|
if (nbytes > 4) {
|
|
|
|
WARN_ON(1);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
for (i = 0; i < nbytes; i++) {
|
|
|
|
buf[i] = time & 0xff;
|
|
|
|
time >>= 8;
|
|
|
|
}
|
|
|
|
|
|
|
|
return i2c_smbus_write_i2c_block_data(client, reg, nbytes, buf);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int ds1374_check_rtc_status(struct i2c_client *client)
|
|
|
|
{
|
|
|
|
int ret = 0;
|
|
|
|
int control, stat;
|
|
|
|
|
|
|
|
stat = i2c_smbus_read_byte_data(client, DS1374_REG_SR);
|
|
|
|
if (stat < 0)
|
|
|
|
return stat;
|
|
|
|
|
|
|
|
if (stat & DS1374_REG_SR_OSF)
|
|
|
|
dev_warn(&client->dev,
|
2013-07-04 02:05:48 +04:00
|
|
|
"oscillator discontinuity flagged, time unreliable\n");
|
2007-10-16 12:28:19 +04:00
|
|
|
|
|
|
|
stat &= ~(DS1374_REG_SR_OSF | DS1374_REG_SR_AF);
|
|
|
|
|
|
|
|
ret = i2c_smbus_write_byte_data(client, DS1374_REG_SR, stat);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
/* If the alarm is pending, clear it before requesting
|
|
|
|
* the interrupt, so an interrupt event isn't reported
|
|
|
|
* before everything is initialized.
|
|
|
|
*/
|
|
|
|
|
|
|
|
control = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
|
|
|
|
if (control < 0)
|
|
|
|
return control;
|
|
|
|
|
|
|
|
control &= ~(DS1374_REG_CR_WACE | DS1374_REG_CR_AIE);
|
|
|
|
return i2c_smbus_write_byte_data(client, DS1374_REG_CR, control);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int ds1374_read_time(struct device *dev, struct rtc_time *time)
|
|
|
|
{
|
|
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
|
|
u32 itime;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
ret = ds1374_read_rtc(client, &itime, DS1374_REG_TOD0, 4);
|
|
|
|
if (!ret)
|
|
|
|
rtc_time_to_tm(itime, time);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int ds1374_set_time(struct device *dev, struct rtc_time *time)
|
|
|
|
{
|
|
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
|
|
unsigned long itime;
|
|
|
|
|
|
|
|
rtc_tm_to_time(time, &itime);
|
|
|
|
return ds1374_write_rtc(client, itime, DS1374_REG_TOD0, 4);
|
|
|
|
}
|
|
|
|
|
2014-12-11 02:53:54 +03:00
|
|
|
#ifndef CONFIG_RTC_DRV_DS1374_WDT
|
2007-10-16 12:28:19 +04:00
|
|
|
/* The ds1374 has a decrementer for an alarm, rather than a comparator.
|
|
|
|
* If the time of day is changed, then the alarm will need to be
|
|
|
|
* reset.
|
|
|
|
*/
|
|
|
|
static int ds1374_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
|
|
|
|
{
|
|
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
|
|
struct ds1374 *ds1374 = i2c_get_clientdata(client);
|
|
|
|
u32 now, cur_alarm;
|
|
|
|
int cr, sr;
|
|
|
|
int ret = 0;
|
|
|
|
|
2008-08-21 01:09:21 +04:00
|
|
|
if (client->irq <= 0)
|
2007-10-16 12:28:19 +04:00
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
mutex_lock(&ds1374->mutex);
|
|
|
|
|
|
|
|
cr = ret = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
|
|
|
|
if (ret < 0)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
sr = ret = i2c_smbus_read_byte_data(client, DS1374_REG_SR);
|
|
|
|
if (ret < 0)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
ret = ds1374_read_rtc(client, &now, DS1374_REG_TOD0, 4);
|
|
|
|
if (ret)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
ret = ds1374_read_rtc(client, &cur_alarm, DS1374_REG_WDALM0, 3);
|
|
|
|
if (ret)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
rtc_time_to_tm(now + cur_alarm, &alarm->time);
|
|
|
|
alarm->enabled = !!(cr & DS1374_REG_CR_WACE);
|
|
|
|
alarm->pending = !!(sr & DS1374_REG_SR_AF);
|
|
|
|
|
|
|
|
out:
|
|
|
|
mutex_unlock(&ds1374->mutex);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int ds1374_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
|
|
|
|
{
|
|
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
|
|
struct ds1374 *ds1374 = i2c_get_clientdata(client);
|
|
|
|
struct rtc_time now;
|
|
|
|
unsigned long new_alarm, itime;
|
|
|
|
int cr;
|
|
|
|
int ret = 0;
|
|
|
|
|
2008-08-21 01:09:21 +04:00
|
|
|
if (client->irq <= 0)
|
2007-10-16 12:28:19 +04:00
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
ret = ds1374_read_time(dev, &now);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
rtc_tm_to_time(&alarm->time, &new_alarm);
|
|
|
|
rtc_tm_to_time(&now, &itime);
|
|
|
|
|
|
|
|
/* This can happen due to races, in addition to dates that are
|
|
|
|
* truly in the past. To avoid requiring the caller to check for
|
|
|
|
* races, dates in the past are assumed to be in the recent past
|
|
|
|
* (i.e. not something that we'd rather the caller know about via
|
|
|
|
* an error), and the alarm is set to go off as soon as possible.
|
|
|
|
*/
|
2009-04-01 02:25:00 +04:00
|
|
|
if (time_before_eq(new_alarm, itime))
|
2007-10-16 12:28:19 +04:00
|
|
|
new_alarm = 1;
|
2009-04-01 02:25:00 +04:00
|
|
|
else
|
|
|
|
new_alarm -= itime;
|
2007-10-16 12:28:19 +04:00
|
|
|
|
|
|
|
mutex_lock(&ds1374->mutex);
|
|
|
|
|
|
|
|
ret = cr = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
|
|
|
|
if (ret < 0)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
/* Disable any existing alarm before setting the new one
|
|
|
|
* (or lack thereof). */
|
|
|
|
cr &= ~DS1374_REG_CR_WACE;
|
|
|
|
|
|
|
|
ret = i2c_smbus_write_byte_data(client, DS1374_REG_CR, cr);
|
|
|
|
if (ret < 0)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
ret = ds1374_write_rtc(client, new_alarm, DS1374_REG_WDALM0, 3);
|
|
|
|
if (ret)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
if (alarm->enabled) {
|
|
|
|
cr |= DS1374_REG_CR_WACE | DS1374_REG_CR_AIE;
|
|
|
|
cr &= ~DS1374_REG_CR_WDALM;
|
|
|
|
|
|
|
|
ret = i2c_smbus_write_byte_data(client, DS1374_REG_CR, cr);
|
|
|
|
}
|
|
|
|
|
|
|
|
out:
|
|
|
|
mutex_unlock(&ds1374->mutex);
|
|
|
|
return ret;
|
|
|
|
}
|
2014-12-11 02:53:54 +03:00
|
|
|
#endif
|
2007-10-16 12:28:19 +04:00
|
|
|
|
|
|
|
static irqreturn_t ds1374_irq(int irq, void *dev_id)
|
|
|
|
{
|
|
|
|
struct i2c_client *client = dev_id;
|
|
|
|
struct ds1374 *ds1374 = i2c_get_clientdata(client);
|
|
|
|
|
|
|
|
disable_irq_nosync(irq);
|
|
|
|
schedule_work(&ds1374->work);
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void ds1374_work(struct work_struct *work)
|
|
|
|
{
|
|
|
|
struct ds1374 *ds1374 = container_of(work, struct ds1374, work);
|
|
|
|
struct i2c_client *client = ds1374->client;
|
|
|
|
int stat, control;
|
|
|
|
|
|
|
|
mutex_lock(&ds1374->mutex);
|
|
|
|
|
|
|
|
stat = i2c_smbus_read_byte_data(client, DS1374_REG_SR);
|
|
|
|
if (stat < 0)
|
2009-07-05 23:08:03 +04:00
|
|
|
goto unlock;
|
2007-10-16 12:28:19 +04:00
|
|
|
|
|
|
|
if (stat & DS1374_REG_SR_AF) {
|
|
|
|
stat &= ~DS1374_REG_SR_AF;
|
|
|
|
i2c_smbus_write_byte_data(client, DS1374_REG_SR, stat);
|
|
|
|
|
|
|
|
control = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
|
|
|
|
if (control < 0)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
control &= ~(DS1374_REG_CR_WACE | DS1374_REG_CR_AIE);
|
|
|
|
i2c_smbus_write_byte_data(client, DS1374_REG_CR, control);
|
|
|
|
|
|
|
|
rtc_update_irq(ds1374->rtc, 1, RTC_AF | RTC_IRQF);
|
|
|
|
}
|
|
|
|
|
|
|
|
out:
|
|
|
|
if (!ds1374->exiting)
|
|
|
|
enable_irq(client->irq);
|
2009-07-05 23:08:03 +04:00
|
|
|
unlock:
|
2007-10-16 12:28:19 +04:00
|
|
|
mutex_unlock(&ds1374->mutex);
|
|
|
|
}
|
|
|
|
|
2014-12-11 02:53:54 +03:00
|
|
|
#ifndef CONFIG_RTC_DRV_DS1374_WDT
|
2011-02-03 04:02:41 +03:00
|
|
|
static int ds1374_alarm_irq_enable(struct device *dev, unsigned int enabled)
|
2007-10-16 12:28:19 +04:00
|
|
|
{
|
|
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
|
|
struct ds1374 *ds1374 = i2c_get_clientdata(client);
|
2011-02-03 04:02:41 +03:00
|
|
|
int ret;
|
2007-10-16 12:28:19 +04:00
|
|
|
|
|
|
|
mutex_lock(&ds1374->mutex);
|
|
|
|
|
2011-02-03 04:02:41 +03:00
|
|
|
ret = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
|
|
|
|
if (ret < 0)
|
|
|
|
goto out;
|
2007-10-16 12:28:19 +04:00
|
|
|
|
2011-02-03 04:02:41 +03:00
|
|
|
if (enabled) {
|
2007-10-16 12:28:19 +04:00
|
|
|
ret |= DS1374_REG_CR_WACE | DS1374_REG_CR_AIE;
|
|
|
|
ret &= ~DS1374_REG_CR_WDALM;
|
2011-02-03 04:02:41 +03:00
|
|
|
} else {
|
|
|
|
ret &= ~DS1374_REG_CR_WACE;
|
2007-10-16 12:28:19 +04:00
|
|
|
}
|
2011-02-03 04:02:41 +03:00
|
|
|
ret = i2c_smbus_write_byte_data(client, DS1374_REG_CR, ret);
|
2007-10-16 12:28:19 +04:00
|
|
|
|
|
|
|
out:
|
|
|
|
mutex_unlock(&ds1374->mutex);
|
|
|
|
return ret;
|
|
|
|
}
|
2014-12-11 02:53:54 +03:00
|
|
|
#endif
|
2007-10-16 12:28:19 +04:00
|
|
|
|
|
|
|
static const struct rtc_class_ops ds1374_rtc_ops = {
|
|
|
|
.read_time = ds1374_read_time,
|
|
|
|
.set_time = ds1374_set_time,
|
2014-12-11 02:53:54 +03:00
|
|
|
#ifndef CONFIG_RTC_DRV_DS1374_WDT
|
2007-10-16 12:28:19 +04:00
|
|
|
.read_alarm = ds1374_read_alarm,
|
|
|
|
.set_alarm = ds1374_set_alarm,
|
2011-02-03 04:02:41 +03:00
|
|
|
.alarm_irq_enable = ds1374_alarm_irq_enable,
|
2014-12-11 02:53:54 +03:00
|
|
|
#endif
|
|
|
|
};
|
|
|
|
|
|
|
|
#ifdef CONFIG_RTC_DRV_DS1374_WDT
|
|
|
|
/*
|
|
|
|
*****************************************************************************
|
|
|
|
*
|
|
|
|
* Watchdog Driver
|
|
|
|
*
|
|
|
|
*****************************************************************************
|
|
|
|
*/
|
|
|
|
static struct i2c_client *save_client;
|
|
|
|
/* Default margin */
|
|
|
|
#define WD_TIMO 131762
|
|
|
|
|
|
|
|
#define DRV_NAME "DS1374 Watchdog"
|
|
|
|
|
|
|
|
static int wdt_margin = WD_TIMO;
|
|
|
|
static unsigned long wdt_is_open;
|
|
|
|
module_param(wdt_margin, int, 0);
|
|
|
|
MODULE_PARM_DESC(wdt_margin, "Watchdog timeout in seconds (default 32s)");
|
|
|
|
|
|
|
|
static const struct watchdog_info ds1374_wdt_info = {
|
|
|
|
.identity = "DS1374 WTD",
|
|
|
|
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
|
|
|
|
WDIOF_MAGICCLOSE,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int ds1374_wdt_settimeout(unsigned int timeout)
|
|
|
|
{
|
|
|
|
int ret = -ENOIOCTLCMD;
|
|
|
|
int cr;
|
|
|
|
|
|
|
|
ret = cr = i2c_smbus_read_byte_data(save_client, DS1374_REG_CR);
|
|
|
|
if (ret < 0)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
/* Disable any existing watchdog/alarm before setting the new one */
|
|
|
|
cr &= ~DS1374_REG_CR_WACE;
|
|
|
|
|
|
|
|
ret = i2c_smbus_write_byte_data(save_client, DS1374_REG_CR, cr);
|
|
|
|
if (ret < 0)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
/* Set new watchdog time */
|
|
|
|
ret = ds1374_write_rtc(save_client, timeout, DS1374_REG_WDALM0, 3);
|
|
|
|
if (ret) {
|
|
|
|
pr_info("rtc-ds1374 - couldn't set new watchdog time\n");
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Enable watchdog timer */
|
|
|
|
cr |= DS1374_REG_CR_WACE | DS1374_REG_CR_WDALM;
|
|
|
|
cr &= ~DS1374_REG_CR_AIE;
|
|
|
|
|
|
|
|
ret = i2c_smbus_write_byte_data(save_client, DS1374_REG_CR, cr);
|
|
|
|
if (ret < 0)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
out:
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Reload the watchdog timer. (ie, pat the watchdog)
|
|
|
|
*/
|
|
|
|
static void ds1374_wdt_ping(void)
|
|
|
|
{
|
|
|
|
u32 val;
|
|
|
|
int ret = 0;
|
|
|
|
|
|
|
|
ret = ds1374_read_rtc(save_client, &val, DS1374_REG_WDALM0, 3);
|
|
|
|
if (ret)
|
|
|
|
pr_info("WD TICK FAIL!!!!!!!!!! %i\n", ret);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void ds1374_wdt_disable(void)
|
|
|
|
{
|
|
|
|
int ret = -ENOIOCTLCMD;
|
|
|
|
int cr;
|
|
|
|
|
|
|
|
cr = i2c_smbus_read_byte_data(save_client, DS1374_REG_CR);
|
|
|
|
/* Disable watchdog timer */
|
|
|
|
cr &= ~DS1374_REG_CR_WACE;
|
|
|
|
|
|
|
|
ret = i2c_smbus_write_byte_data(save_client, DS1374_REG_CR, cr);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Watchdog device is opened, and watchdog starts running.
|
|
|
|
*/
|
|
|
|
static int ds1374_wdt_open(struct inode *inode, struct file *file)
|
|
|
|
{
|
|
|
|
struct ds1374 *ds1374 = i2c_get_clientdata(save_client);
|
|
|
|
|
|
|
|
if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) {
|
|
|
|
mutex_lock(&ds1374->mutex);
|
|
|
|
if (test_and_set_bit(0, &wdt_is_open)) {
|
|
|
|
mutex_unlock(&ds1374->mutex);
|
|
|
|
return -EBUSY;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* Activate
|
|
|
|
*/
|
|
|
|
wdt_is_open = 1;
|
|
|
|
mutex_unlock(&ds1374->mutex);
|
|
|
|
return nonseekable_open(inode, file);
|
|
|
|
}
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Close the watchdog device.
|
|
|
|
*/
|
|
|
|
static int ds1374_wdt_release(struct inode *inode, struct file *file)
|
|
|
|
{
|
|
|
|
if (MINOR(inode->i_rdev) == WATCHDOG_MINOR)
|
|
|
|
clear_bit(0, &wdt_is_open);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Pat the watchdog whenever device is written to.
|
|
|
|
*/
|
|
|
|
static ssize_t ds1374_wdt_write(struct file *file, const char __user *data,
|
|
|
|
size_t len, loff_t *ppos)
|
|
|
|
{
|
|
|
|
if (len) {
|
|
|
|
ds1374_wdt_ping();
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t ds1374_wdt_read(struct file *file, char __user *data,
|
|
|
|
size_t len, loff_t *ppos)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Handle commands from user-space.
|
|
|
|
*/
|
|
|
|
static long ds1374_wdt_ioctl(struct file *file, unsigned int cmd,
|
|
|
|
unsigned long arg)
|
|
|
|
{
|
|
|
|
int new_margin, options;
|
|
|
|
|
|
|
|
switch (cmd) {
|
|
|
|
case WDIOC_GETSUPPORT:
|
|
|
|
return copy_to_user((struct watchdog_info __user *)arg,
|
|
|
|
&ds1374_wdt_info, sizeof(ds1374_wdt_info)) ? -EFAULT : 0;
|
|
|
|
|
|
|
|
case WDIOC_GETSTATUS:
|
|
|
|
case WDIOC_GETBOOTSTATUS:
|
|
|
|
return put_user(0, (int __user *)arg);
|
|
|
|
case WDIOC_KEEPALIVE:
|
|
|
|
ds1374_wdt_ping();
|
|
|
|
return 0;
|
|
|
|
case WDIOC_SETTIMEOUT:
|
|
|
|
if (get_user(new_margin, (int __user *)arg))
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
if (new_margin < 1 || new_margin > 16777216)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
wdt_margin = new_margin;
|
|
|
|
ds1374_wdt_settimeout(new_margin);
|
|
|
|
ds1374_wdt_ping();
|
|
|
|
/* fallthrough */
|
|
|
|
case WDIOC_GETTIMEOUT:
|
|
|
|
return put_user(wdt_margin, (int __user *)arg);
|
|
|
|
case WDIOC_SETOPTIONS:
|
|
|
|
if (copy_from_user(&options, (int __user *)arg, sizeof(int)))
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
if (options & WDIOS_DISABLECARD) {
|
|
|
|
pr_info("rtc-ds1374: disable watchdog\n");
|
|
|
|
ds1374_wdt_disable();
|
|
|
|
}
|
|
|
|
|
|
|
|
if (options & WDIOS_ENABLECARD) {
|
|
|
|
pr_info("rtc-ds1374: enable watchdog\n");
|
|
|
|
ds1374_wdt_settimeout(wdt_margin);
|
|
|
|
ds1374_wdt_ping();
|
|
|
|
}
|
|
|
|
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
return -ENOTTY;
|
|
|
|
}
|
|
|
|
|
|
|
|
static long ds1374_wdt_unlocked_ioctl(struct file *file, unsigned int cmd,
|
|
|
|
unsigned long arg)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
struct ds1374 *ds1374 = i2c_get_clientdata(save_client);
|
|
|
|
|
|
|
|
mutex_lock(&ds1374->mutex);
|
|
|
|
ret = ds1374_wdt_ioctl(file, cmd, arg);
|
|
|
|
mutex_unlock(&ds1374->mutex);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int ds1374_wdt_notify_sys(struct notifier_block *this,
|
|
|
|
unsigned long code, void *unused)
|
|
|
|
{
|
|
|
|
if (code == SYS_DOWN || code == SYS_HALT)
|
|
|
|
/* Disable Watchdog */
|
|
|
|
ds1374_wdt_disable();
|
|
|
|
return NOTIFY_DONE;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct file_operations ds1374_wdt_fops = {
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.read = ds1374_wdt_read,
|
|
|
|
.unlocked_ioctl = ds1374_wdt_unlocked_ioctl,
|
|
|
|
.write = ds1374_wdt_write,
|
|
|
|
.open = ds1374_wdt_open,
|
|
|
|
.release = ds1374_wdt_release,
|
|
|
|
.llseek = no_llseek,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct miscdevice ds1374_miscdev = {
|
|
|
|
.minor = WATCHDOG_MINOR,
|
|
|
|
.name = "watchdog",
|
|
|
|
.fops = &ds1374_wdt_fops,
|
2007-10-16 12:28:19 +04:00
|
|
|
};
|
|
|
|
|
2014-12-11 02:53:54 +03:00
|
|
|
static struct notifier_block ds1374_wdt_notifier = {
|
|
|
|
.notifier_call = ds1374_wdt_notify_sys,
|
|
|
|
};
|
|
|
|
|
|
|
|
#endif /*CONFIG_RTC_DRV_DS1374_WDT*/
|
|
|
|
/*
|
|
|
|
*****************************************************************************
|
|
|
|
*
|
|
|
|
* Driver Interface
|
|
|
|
*
|
|
|
|
*****************************************************************************
|
|
|
|
*/
|
2008-04-30 01:11:39 +04:00
|
|
|
static int ds1374_probe(struct i2c_client *client,
|
|
|
|
const struct i2c_device_id *id)
|
2007-10-16 12:28:19 +04:00
|
|
|
{
|
|
|
|
struct ds1374 *ds1374;
|
|
|
|
int ret;
|
|
|
|
|
2013-04-30 03:20:30 +04:00
|
|
|
ds1374 = devm_kzalloc(&client->dev, sizeof(struct ds1374), GFP_KERNEL);
|
2007-10-16 12:28:19 +04:00
|
|
|
if (!ds1374)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
ds1374->client = client;
|
|
|
|
i2c_set_clientdata(client, ds1374);
|
|
|
|
|
|
|
|
INIT_WORK(&ds1374->work, ds1374_work);
|
|
|
|
mutex_init(&ds1374->mutex);
|
|
|
|
|
|
|
|
ret = ds1374_check_rtc_status(client);
|
|
|
|
if (ret)
|
2013-04-30 03:20:30 +04:00
|
|
|
return ret;
|
2007-10-16 12:28:19 +04:00
|
|
|
|
2008-08-21 01:09:21 +04:00
|
|
|
if (client->irq > 0) {
|
2013-04-30 03:20:30 +04:00
|
|
|
ret = devm_request_irq(&client->dev, client->irq, ds1374_irq, 0,
|
2013-07-04 02:05:48 +04:00
|
|
|
"ds1374", client);
|
2007-10-16 12:28:19 +04:00
|
|
|
if (ret) {
|
|
|
|
dev_err(&client->dev, "unable to request IRQ\n");
|
2013-04-30 03:20:30 +04:00
|
|
|
return ret;
|
2007-10-16 12:28:19 +04:00
|
|
|
}
|
rtc: set wakeup capability for I2C and SPI RTC drivers
RTC core won't allow wakeup alarms to be set if RTC devices' parent (i.e.
i2c_client or spi_device) isn't wakeup capable.
For I2C devices there is I2C_CLIENT_WAKE flag exists that we can pass via
board info, and if set, I2C core will initialize wakeup capability. For
SPI devices there is no such flag at all.
I believe that it's not platform code responsibility to allow or disallow
wakeups, instead, drivers themselves should set the capability if a device
can trigger wakeups.
That's what drivers/base/power/sysfs.c says:
* It is the responsibility of device drivers to enable (or disable)
* wakeup signaling as part of changing device power states, respecting
* the policy choices provided through the driver model.
I2C and SPI RTC devices send wakeup events via interrupt lines, so we
should set the wakeup capability if IRQ is routed.
Ideally we should also check irq for wakeup capability before setting
device's capability, i.e.
if (can_irq_wake(irq))
device_set_wakeup_capable(&client->dev, 1);
But there is no can_irq_wake() call exist, and it is not that trivial to
implement it for all interrupts controllers and complex/cascaded setups.
drivers/base/power/sysfs.c also covers these cases:
* Devices may not be able to generate wakeup events from all power
* states. Also, the events may be ignored in some configurations;
* for example, they might need help from other devices that aren't
* active
So there is no guarantee that wakeup will actually work, and so I think
there is no point in being pedantic wrt checking IRQ wakeup capability.
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Cc: Ben Dooks <ben-linux@fluff.org>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-12-18 02:27:23 +03:00
|
|
|
|
|
|
|
device_set_wakeup_capable(&client->dev, 1);
|
2007-10-16 12:28:19 +04:00
|
|
|
}
|
|
|
|
|
2013-04-30 03:20:30 +04:00
|
|
|
ds1374->rtc = devm_rtc_device_register(&client->dev, client->name,
|
2013-07-04 02:05:48 +04:00
|
|
|
&ds1374_rtc_ops, THIS_MODULE);
|
2007-10-16 12:28:19 +04:00
|
|
|
if (IS_ERR(ds1374->rtc)) {
|
|
|
|
dev_err(&client->dev, "unable to register the class device\n");
|
2013-04-30 03:20:30 +04:00
|
|
|
return PTR_ERR(ds1374->rtc);
|
2007-10-16 12:28:19 +04:00
|
|
|
}
|
|
|
|
|
2014-12-11 02:53:54 +03:00
|
|
|
#ifdef CONFIG_RTC_DRV_DS1374_WDT
|
|
|
|
save_client = client;
|
|
|
|
ret = misc_register(&ds1374_miscdev);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
ret = register_reboot_notifier(&ds1374_wdt_notifier);
|
|
|
|
if (ret) {
|
|
|
|
misc_deregister(&ds1374_miscdev);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
ds1374_wdt_settimeout(131072);
|
|
|
|
#endif
|
|
|
|
|
2007-10-16 12:28:19 +04:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2012-12-22 01:09:38 +04:00
|
|
|
static int ds1374_remove(struct i2c_client *client)
|
2007-10-16 12:28:19 +04:00
|
|
|
{
|
|
|
|
struct ds1374 *ds1374 = i2c_get_clientdata(client);
|
2014-12-11 02:53:54 +03:00
|
|
|
#ifdef CONFIG_RTC_DRV_DS1374_WDT
|
|
|
|
int res;
|
|
|
|
|
|
|
|
res = misc_deregister(&ds1374_miscdev);
|
|
|
|
if (!res)
|
|
|
|
ds1374_miscdev.parent = NULL;
|
|
|
|
unregister_reboot_notifier(&ds1374_wdt_notifier);
|
|
|
|
#endif
|
2007-10-16 12:28:19 +04:00
|
|
|
|
2008-08-21 01:09:21 +04:00
|
|
|
if (client->irq > 0) {
|
2007-10-16 12:28:19 +04:00
|
|
|
mutex_lock(&ds1374->mutex);
|
|
|
|
ds1374->exiting = 1;
|
|
|
|
mutex_unlock(&ds1374->mutex);
|
|
|
|
|
2013-04-30 03:20:30 +04:00
|
|
|
devm_free_irq(&client->dev, client->irq, client);
|
2010-12-24 18:00:17 +03:00
|
|
|
cancel_work_sync(&ds1374->work);
|
2007-10-16 12:28:19 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2013-04-30 03:20:07 +04:00
|
|
|
#ifdef CONFIG_PM_SLEEP
|
2011-03-23 02:34:52 +03:00
|
|
|
static int ds1374_suspend(struct device *dev)
|
2008-10-16 09:02:56 +04:00
|
|
|
{
|
2011-03-23 02:34:52 +03:00
|
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
|
|
|
2008-10-16 09:02:56 +04:00
|
|
|
if (client->irq >= 0 && device_may_wakeup(&client->dev))
|
|
|
|
enable_irq_wake(client->irq);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-03-23 02:34:52 +03:00
|
|
|
static int ds1374_resume(struct device *dev)
|
2008-10-16 09:02:56 +04:00
|
|
|
{
|
2011-03-23 02:34:52 +03:00
|
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
|
|
|
2008-10-16 09:02:56 +04:00
|
|
|
if (client->irq >= 0 && device_may_wakeup(&client->dev))
|
|
|
|
disable_irq_wake(client->irq);
|
|
|
|
return 0;
|
|
|
|
}
|
2013-04-30 03:20:07 +04:00
|
|
|
#endif
|
2011-03-23 02:34:52 +03:00
|
|
|
|
|
|
|
static SIMPLE_DEV_PM_OPS(ds1374_pm, ds1374_suspend, ds1374_resume);
|
|
|
|
|
2007-10-16 12:28:19 +04:00
|
|
|
static struct i2c_driver ds1374_driver = {
|
|
|
|
.driver = {
|
|
|
|
.name = "rtc-ds1374",
|
|
|
|
.owner = THIS_MODULE,
|
2013-04-30 03:20:07 +04:00
|
|
|
.pm = &ds1374_pm,
|
2007-10-16 12:28:19 +04:00
|
|
|
},
|
|
|
|
.probe = ds1374_probe,
|
2012-12-22 01:09:38 +04:00
|
|
|
.remove = ds1374_remove,
|
2008-04-30 01:11:40 +04:00
|
|
|
.id_table = ds1374_id,
|
2007-10-16 12:28:19 +04:00
|
|
|
};
|
|
|
|
|
2012-03-24 02:02:31 +04:00
|
|
|
module_i2c_driver(ds1374_driver);
|
2007-10-16 12:28:19 +04:00
|
|
|
|
|
|
|
MODULE_AUTHOR("Scott Wood <scottwood@freescale.com>");
|
|
|
|
MODULE_DESCRIPTION("Maxim/Dallas DS1374 RTC Driver");
|
|
|
|
MODULE_LICENSE("GPL");
|