[linux-2.6-block.git] / drivers / rtc / rtc-ds1374.c

/*
 * 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>.
 *
 * Copyright (C) 2014 Rose Technology
 * 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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#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 <linux/slab.h>
#include <linux/pm.h>
#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

#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 */

static const struct i2c_device_id ds1374_id[] = {
	{ "ds1374", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, ds1374_id);

#ifdef CONFIG_OF
static const struct of_device_id ds1374_of_match[] = {
	{ .compatible = "dallas,ds1374" },
	{ }
};
MODULE_DEVICE_TABLE(of, ds1374_of_match);
#endif

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,
			   int reg, int nbytes)
{
	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,
			    int reg, int nbytes)
{
	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,
			 "oscillator discontinuity flagged, time unreliable\n");

	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);
}

#ifndef CONFIG_RTC_DRV_DS1374_WDT
/* 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;

	if (client->irq <= 0)
		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;

	if (client->irq <= 0)
		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.
	 */
	if (time_before_eq(new_alarm, itime))
		new_alarm = 1;
	else
		new_alarm -= itime;

	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;
}
#endif

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)
		goto unlock;

	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);
unlock:
	mutex_unlock(&ds1374->mutex);
}

#ifndef CONFIG_RTC_DRV_DS1374_WDT
static int ds1374_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct ds1374 *ds1374 = i2c_get_clientdata(client);
	int ret;

	mutex_lock(&ds1374->mutex);

	ret = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
	if (ret < 0)
		goto out;

	if (enabled) {
		ret |= DS1374_REG_CR_WACE | DS1374_REG_CR_AIE;
		ret &= ~DS1374_REG_CR_WDALM;
	} else {
		ret &= ~DS1374_REG_CR_WACE;
	}
	ret = i2c_smbus_write_byte_data(client, DS1374_REG_CR, ret);

out:
	mutex_unlock(&ds1374->mutex);
	return ret;
}
#endif

static const struct rtc_class_ops ds1374_rtc_ops = {
	.read_time = ds1374_read_time,
	.set_time = ds1374_set_time,
#ifndef CONFIG_RTC_DRV_DS1374_WDT
	.read_alarm = ds1374_read_alarm,
	.set_alarm = ds1374_set_alarm,
	.alarm_irq_enable = ds1374_alarm_irq_enable,
#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("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("disable watchdog\n");
			ds1374_wdt_disable();
		}

		if (options & WDIOS_ENABLECARD) {
			pr_info("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,
};

static struct notifier_block ds1374_wdt_notifier = {
	.notifier_call = ds1374_wdt_notify_sys,
};

#endif /*CONFIG_RTC_DRV_DS1374_WDT*/
/*
 *****************************************************************************
 *
 *	Driver Interface
 *
 *****************************************************************************
 */
static int ds1374_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct ds1374 *ds1374;
	int ret;

	ds1374 = devm_kzalloc(&client->dev, sizeof(struct ds1374), GFP_KERNEL);
	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)
		return ret;

	if (client->irq > 0) {
		ret = devm_request_irq(&client->dev, client->irq, ds1374_irq, 0,
					"ds1374", client);
		if (ret) {
			dev_err(&client->dev, "unable to request IRQ\n");
			return ret;
		}

		device_set_wakeup_capable(&client->dev, 1);
	}

	ds1374->rtc = devm_rtc_device_register(&client->dev, client->name,
						&ds1374_rtc_ops, THIS_MODULE);
	if (IS_ERR(ds1374->rtc)) {
		dev_err(&client->dev, "unable to register the class device\n");
		return PTR_ERR(ds1374->rtc);
	}

#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

	return 0;
}

static int ds1374_remove(struct i2c_client *client)
{
	struct ds1374 *ds1374 = i2c_get_clientdata(client);
#ifdef CONFIG_RTC_DRV_DS1374_WDT
	misc_deregister(&ds1374_miscdev);
	ds1374_miscdev.parent = NULL;
	unregister_reboot_notifier(&ds1374_wdt_notifier);
#endif

	if (client->irq > 0) {
		mutex_lock(&ds1374->mutex);
		ds1374->exiting = 1;
		mutex_unlock(&ds1374->mutex);

		devm_free_irq(&client->dev, client->irq, client);
		cancel_work_sync(&ds1374->work);
	}

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int ds1374_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);

	if (client->irq > 0 && device_may_wakeup(&client->dev))
		enable_irq_wake(client->irq);
	return 0;
}

static int ds1374_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);

	if (client->irq > 0 && device_may_wakeup(&client->dev))
		disable_irq_wake(client->irq);
	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(ds1374_pm, ds1374_suspend, ds1374_resume);

static struct i2c_driver ds1374_driver = {
	.driver = {
		.name = "rtc-ds1374",
		.pm = &ds1374_pm,
	},
	.probe = ds1374_probe,
	.remove = ds1374_remove,
	.id_table = ds1374_id,
};

module_i2c_driver(ds1374_driver);

MODULE_AUTHOR("Scott Wood <scottwood@freescale.com>");
MODULE_DESCRIPTION("Maxim/Dallas DS1374 RTC Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
bf4994d7 SW	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	*
920f91e5	7	* Copyright (C) 2014 Rose Technology
bf4994d7 SW	8	* Copyright (C) 2006-2007 Freescale Semiconductor
	9	*
	10	* 2005 (c) MontaVista Software, Inc. This file is licensed under
	11	* the terms of the GNU General Public License version 2. This program
	12	* is licensed "as is" without any warranty of any kind, whether express
	13	* or implied.
	14	*/
	15	/*
	16	* It would be more efficient to use i2c msgs/i2c_transfer directly but, as
	17	* recommened in .../Documentation/i2c/writing-clients section
	18	* "Sending and receiving", using SMBus level communication is preferred.
	19	*/
	20
a737e835 JP	21	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
a737e835 JP	22
bf4994d7 SW	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>
5a0e3ad6	30	#include <linux/slab.h>
bc96ba74	31	#include <linux/pm.h>
920f91e5 SA	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
bf4994d7 SW	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
3760f736	56	static const struct i2c_device_id ds1374_id[] = {
f2eb4327	57	{ "ds1374", 0 },
3760f736 JD	58	{ }
	59	};
	60	MODULE_DEVICE_TABLE(i2c, ds1374_id);
	61
920f91e5 SA	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
bf4994d7 SW	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,
adc7b9b6	86	int reg, int nbytes)
bf4994d7 SW	87	{
	88	u8 buf[4];
	89	int ret;
	90	int i;
	91
	92	if (nbytes > 4) {
	93	WARN_ON(1);
	94	return -EINVAL;
	95	}
	96
	97	ret = i2c_smbus_read_i2c_block_data(client, reg, nbytes, buf);
	98
	99	if (ret < 0)
	100	return ret;
	101	if (ret < nbytes)
	102	return -EIO;
	103
	104	for (i = nbytes - 1, *time = 0; i >= 0; i--)
	105	time = (time << 8) \| buf[i];
	106
	107	return 0;
	108	}
	109
	110	static int ds1374_write_rtc(struct i2c_client *client, u32 time,
adc7b9b6	111	int reg, int nbytes)
bf4994d7 SW	112	{
	113	u8 buf[4];
	114	int i;
	115
	116	if (nbytes > 4) {
	117	WARN_ON(1);
	118	return -EINVAL;
	119	}
	120
	121	for (i = 0; i < nbytes; i++) {
	122	buf[i] = time & 0xff;
	123	time >>= 8;
	124	}
	125
	126	return i2c_smbus_write_i2c_block_data(client, reg, nbytes, buf);
	127	}
	128
	129	static int ds1374_check_rtc_status(struct i2c_client *client)
	130	{
	131	int ret = 0;
	132	int control, stat;
	133
	134	stat = i2c_smbus_read_byte_data(client, DS1374_REG_SR);
	135	if (stat < 0)
	136	return stat;
	137
	138	if (stat & DS1374_REG_SR_OSF)
	139	dev_warn(&client->dev,
adc7b9b6	140	"oscillator discontinuity flagged, time unreliable\n");
bf4994d7 SW	141
	142	stat &= ~(DS1374_REG_SR_OSF \| DS1374_REG_SR_AF);
	143
	144	ret = i2c_smbus_write_byte_data(client, DS1374_REG_SR, stat);
	145	if (ret < 0)
	146	return ret;
	147
	148	/* If the alarm is pending, clear it before requesting
	149	* the interrupt, so an interrupt event isn't reported
	150	* before everything is initialized.
	151	*/
	152
	153	control = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
	154	if (control < 0)
	155	return control;
	156
	157	control &= ~(DS1374_REG_CR_WACE \| DS1374_REG_CR_AIE);
	158	return i2c_smbus_write_byte_data(client, DS1374_REG_CR, control);
	159	}
	160
	161	static int ds1374_read_time(struct device dev, struct rtc_time time)
	162	{
	163	struct i2c_client *client = to_i2c_client(dev);
	164	u32 itime;
	165	int ret;
	166
	167	ret = ds1374_read_rtc(client, &itime, DS1374_REG_TOD0, 4);
	168	if (!ret)
	169	rtc_time_to_tm(itime, time);
	170
	171	return ret;
	172	}
	173
	174	static int ds1374_set_time(struct device dev, struct rtc_time time)
	175	{
	176	struct i2c_client *client = to_i2c_client(dev);
	177	unsigned long itime;
	178
	179	rtc_tm_to_time(time, &itime);
	180	return ds1374_write_rtc(client, itime, DS1374_REG_TOD0, 4);
	181	}
	182
920f91e5	183	#ifndef CONFIG_RTC_DRV_DS1374_WDT
bf4994d7 SW	184	/* The ds1374 has a decrementer for an alarm, rather than a comparator.
	185	* If the time of day is changed, then the alarm will need to be
	186	* reset.
	187	*/
	188	static int ds1374_read_alarm(struct device dev, struct rtc_wkalrm alarm)
	189	{
	190	struct i2c_client *client = to_i2c_client(dev);
	191	struct ds1374 *ds1374 = i2c_get_clientdata(client);
	192	u32 now, cur_alarm;
	193	int cr, sr;
	194	int ret = 0;
	195
b42f9317	196	if (client->irq <= 0)
bf4994d7 SW	197	return -EINVAL;
	198
	199	mutex_lock(&ds1374->mutex);
	200
	201	cr = ret = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
	202	if (ret < 0)
	203	goto out;
	204
	205	sr = ret = i2c_smbus_read_byte_data(client, DS1374_REG_SR);
	206	if (ret < 0)
	207	goto out;
	208
	209	ret = ds1374_read_rtc(client, &now, DS1374_REG_TOD0, 4);
	210	if (ret)
	211	goto out;
	212
	213	ret = ds1374_read_rtc(client, &cur_alarm, DS1374_REG_WDALM0, 3);
	214	if (ret)
	215	goto out;
	216
	217	rtc_time_to_tm(now + cur_alarm, &alarm->time);
	218	alarm->enabled = !!(cr & DS1374_REG_CR_WACE);
	219	alarm->pending = !!(sr & DS1374_REG_SR_AF);
	220
	221	out:
	222	mutex_unlock(&ds1374->mutex);
	223	return ret;
	224	}
	225
	226	static int ds1374_set_alarm(struct device dev, struct rtc_wkalrm alarm)
	227	{
	228	struct i2c_client *client = to_i2c_client(dev);
	229	struct ds1374 *ds1374 = i2c_get_clientdata(client);
	230	struct rtc_time now;
	231	unsigned long new_alarm, itime;
	232	int cr;
	233	int ret = 0;
	234
b42f9317	235	if (client->irq <= 0)
bf4994d7 SW	236	return -EINVAL;
	237
	238	ret = ds1374_read_time(dev, &now);
	239	if (ret < 0)
	240	return ret;
	241
	242	rtc_tm_to_time(&alarm->time, &new_alarm);
	243	rtc_tm_to_time(&now, &itime);
	244
bf4994d7 SW	245	/* This can happen due to races, in addition to dates that are
	246	* truly in the past. To avoid requiring the caller to check for
	247	* races, dates in the past are assumed to be in the recent past
	248	* (i.e. not something that we'd rather the caller know about via
	249	* an error), and the alarm is set to go off as soon as possible.
	250	*/
fa7af8b1	251	if (time_before_eq(new_alarm, itime))
bf4994d7	252	new_alarm = 1;
fa7af8b1 RK	253	else
fa7af8b1 RK	254	new_alarm -= itime;
bf4994d7 SW	255
	256	mutex_lock(&ds1374->mutex);
	257
	258	ret = cr = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
	259	if (ret < 0)
	260	goto out;
	261
	262	/* Disable any existing alarm before setting the new one
	263	* (or lack thereof). */
	264	cr &= ~DS1374_REG_CR_WACE;
	265
	266	ret = i2c_smbus_write_byte_data(client, DS1374_REG_CR, cr);
	267	if (ret < 0)
	268	goto out;
	269
	270	ret = ds1374_write_rtc(client, new_alarm, DS1374_REG_WDALM0, 3);
	271	if (ret)
	272	goto out;
	273
	274	if (alarm->enabled) {
	275	cr \|= DS1374_REG_CR_WACE \| DS1374_REG_CR_AIE;
	276	cr &= ~DS1374_REG_CR_WDALM;
	277
	278	ret = i2c_smbus_write_byte_data(client, DS1374_REG_CR, cr);
	279	}
	280
	281	out:
	282	mutex_unlock(&ds1374->mutex);
	283	return ret;
	284	}
920f91e5	285	#endif
bf4994d7 SW	286
	287	static irqreturn_t ds1374_irq(int irq, void *dev_id)
	288	{
	289	struct i2c_client *client = dev_id;
	290	struct ds1374 *ds1374 = i2c_get_clientdata(client);
	291
	292	disable_irq_nosync(irq);
	293	schedule_work(&ds1374->work);
	294	return IRQ_HANDLED;
	295	}
	296
	297	static void ds1374_work(struct work_struct *work)
	298	{
	299	struct ds1374 *ds1374 = container_of(work, struct ds1374, work);
	300	struct i2c_client *client = ds1374->client;
	301	int stat, control;
	302
	303	mutex_lock(&ds1374->mutex);
	304
	305	stat = i2c_smbus_read_byte_data(client, DS1374_REG_SR);
	306	if (stat < 0)
28df30e6	307	goto unlock;
bf4994d7 SW	308
	309	if (stat & DS1374_REG_SR_AF) {
	310	stat &= ~DS1374_REG_SR_AF;
	311	i2c_smbus_write_byte_data(client, DS1374_REG_SR, stat);
	312
	313	control = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
	314	if (control < 0)
	315	goto out;
	316
	317	control &= ~(DS1374_REG_CR_WACE \| DS1374_REG_CR_AIE);
	318	i2c_smbus_write_byte_data(client, DS1374_REG_CR, control);
	319
bf4994d7	320	rtc_update_irq(ds1374->rtc, 1, RTC_AF \| RTC_IRQF);
bf4994d7 SW	321	}
	322
	323	out:
	324	if (!ds1374->exiting)
	325	enable_irq(client->irq);
28df30e6	326	unlock:
bf4994d7 SW	327	mutex_unlock(&ds1374->mutex);
	328	}
	329
920f91e5	330	#ifndef CONFIG_RTC_DRV_DS1374_WDT
16380c15	331	static int ds1374_alarm_irq_enable(struct device *dev, unsigned int enabled)
bf4994d7 SW	332	{
	333	struct i2c_client *client = to_i2c_client(dev);
	334	struct ds1374 *ds1374 = i2c_get_clientdata(client);
16380c15	335	int ret;
bf4994d7 SW	336
	337	mutex_lock(&ds1374->mutex);
	338
16380c15 JS	339	ret = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
	340	if (ret < 0)
	341	goto out;
bf4994d7	342
16380c15	343	if (enabled) {
bf4994d7 SW	344	ret \|= DS1374_REG_CR_WACE \| DS1374_REG_CR_AIE;
bf4994d7 SW	345	ret &= ~DS1374_REG_CR_WDALM;
16380c15 JS	346	} else {
16380c15 JS	347	ret &= ~DS1374_REG_CR_WACE;
bf4994d7	348	}
16380c15	349	ret = i2c_smbus_write_byte_data(client, DS1374_REG_CR, ret);
bf4994d7 SW	350
	351	out:
	352	mutex_unlock(&ds1374->mutex);
	353	return ret;
	354	}
920f91e5	355	#endif
bf4994d7 SW	356
	357	static const struct rtc_class_ops ds1374_rtc_ops = {
	358	.read_time = ds1374_read_time,
	359	.set_time = ds1374_set_time,
920f91e5	360	#ifndef CONFIG_RTC_DRV_DS1374_WDT
bf4994d7 SW	361	.read_alarm = ds1374_read_alarm,
bf4994d7 SW	362	.set_alarm = ds1374_set_alarm,
16380c15	363	.alarm_irq_enable = ds1374_alarm_irq_enable,
920f91e5 SA	364	#endif
	365	};
	366
	367	#ifdef CONFIG_RTC_DRV_DS1374_WDT
	368	/*
	369	*****************************************************************************
	370	*
	371	* Watchdog Driver
	372	*
	373	*****************************************************************************
	374	*/
	375	static struct i2c_client *save_client;
	376	/* Default margin */
	377	#define WD_TIMO 131762
	378
	379	#define DRV_NAME "DS1374 Watchdog"
	380
	381	static int wdt_margin = WD_TIMO;
	382	static unsigned long wdt_is_open;
	383	module_param(wdt_margin, int, 0);
	384	MODULE_PARM_DESC(wdt_margin, "Watchdog timeout in seconds (default 32s)");
	385
	386	static const struct watchdog_info ds1374_wdt_info = {
	387	.identity = "DS1374 WTD",
	388	.options = WDIOF_SETTIMEOUT \| WDIOF_KEEPALIVEPING \|
	389	WDIOF_MAGICCLOSE,
	390	};
	391
	392	static int ds1374_wdt_settimeout(unsigned int timeout)
	393	{
	394	int ret = -ENOIOCTLCMD;
	395	int cr;
	396
	397	ret = cr = i2c_smbus_read_byte_data(save_client, DS1374_REG_CR);
	398	if (ret < 0)
	399	goto out;
	400
	401	/* Disable any existing watchdog/alarm before setting the new one */
	402	cr &= ~DS1374_REG_CR_WACE;
	403
	404	ret = i2c_smbus_write_byte_data(save_client, DS1374_REG_CR, cr);
	405	if (ret < 0)
	406	goto out;
	407
	408	/* Set new watchdog time */
	409	ret = ds1374_write_rtc(save_client, timeout, DS1374_REG_WDALM0, 3);
	410	if (ret) {
a737e835	411	pr_info("couldn't set new watchdog time\n");
920f91e5 SA	412	goto out;
	413	}
	414
	415	/* Enable watchdog timer */
	416	cr \|= DS1374_REG_CR_WACE \| DS1374_REG_CR_WDALM;
	417	cr &= ~DS1374_REG_CR_AIE;
	418
	419	ret = i2c_smbus_write_byte_data(save_client, DS1374_REG_CR, cr);
	420	if (ret < 0)
	421	goto out;
	422
	423	return 0;
	424	out:
	425	return ret;
	426	}
	427
	428
	429	/*
	430	* Reload the watchdog timer. (ie, pat the watchdog)
	431	*/
	432	static void ds1374_wdt_ping(void)
	433	{
	434	u32 val;
	435	int ret = 0;
	436
	437	ret = ds1374_read_rtc(save_client, &val, DS1374_REG_WDALM0, 3);
	438	if (ret)
	439	pr_info("WD TICK FAIL!!!!!!!!!! %i\n", ret);
	440	}
	441
	442	static void ds1374_wdt_disable(void)
	443	{
	444	int ret = -ENOIOCTLCMD;
	445	int cr;
	446
	447	cr = i2c_smbus_read_byte_data(save_client, DS1374_REG_CR);
	448	/* Disable watchdog timer */
	449	cr &= ~DS1374_REG_CR_WACE;
	450
	451	ret = i2c_smbus_write_byte_data(save_client, DS1374_REG_CR, cr);
	452	}
	453
	454	/*
	455	* Watchdog device is opened, and watchdog starts running.
	456	*/
	457	static int ds1374_wdt_open(struct inode inode, struct file file)
	458	{
	459	struct ds1374 *ds1374 = i2c_get_clientdata(save_client);
	460
	461	if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) {
	462	mutex_lock(&ds1374->mutex);
	463	if (test_and_set_bit(0, &wdt_is_open)) {
	464	mutex_unlock(&ds1374->mutex);
	465	return -EBUSY;
	466	}
	467	/*
	468	* Activate
	469	*/
	470	wdt_is_open = 1;
	471	mutex_unlock(&ds1374->mutex);
	472	return nonseekable_open(inode, file);
	473	}
	474	return -ENODEV;
	475	}
476
477	/*
478	* Close the watchdog device.
479	*/
480	static int ds1374_wdt_release(struct inode inode, struct file file)
481	{
482	if (MINOR(inode->i_rdev) == WATCHDOG_MINOR)
483	clear_bit(0, &wdt_is_open);
484
485	return 0;
486	}
487
488	/*
489	* Pat the watchdog whenever device is written to.
490	*/
491	static ssize_t ds1374_wdt_write(struct file file, const char __user data,
492	size_t len, loff_t *ppos)
493	{
494	if (len) {
495	ds1374_wdt_ping();
496	return 1;
497	}
498	return 0;
499	}
500
501	static ssize_t ds1374_wdt_read(struct file file, char __user data,
502	size_t len, loff_t *ppos)
503	{
504	return 0;
505	}
506
507	/*
508	* Handle commands from user-space.
509	*/
510	static long ds1374_wdt_ioctl(struct file *file, unsigned int cmd,
511	unsigned long arg)
512	{
513	int new_margin, options;
514
515	switch (cmd) {
516	case WDIOC_GETSUPPORT:
517	return copy_to_user((struct watchdog_info __user *)arg,
518	&ds1374_wdt_info, sizeof(ds1374_wdt_info)) ? -EFAULT : 0;
519
520	case WDIOC_GETSTATUS:
521	case WDIOC_GETBOOTSTATUS:
522	return put_user(0, (int __user *)arg);
523	case WDIOC_KEEPALIVE:
524	ds1374_wdt_ping();
525	return 0;
526	case WDIOC_SETTIMEOUT:
527	if (get_user(new_margin, (int __user *)arg))
528	return -EFAULT;
529
530	if (new_margin < 1 \|\| new_margin > 16777216)
531	return -EINVAL;
532
533	wdt_margin = new_margin;
534	ds1374_wdt_settimeout(new_margin);
535	ds1374_wdt_ping();
536	/* fallthrough */
537	case WDIOC_GETTIMEOUT:
538	return put_user(wdt_margin, (int __user *)arg);
539	case WDIOC_SETOPTIONS:
540	if (copy_from_user(&options, (int __user *)arg, sizeof(int)))
541	return -EFAULT;
542
543	if (options & WDIOS_DISABLECARD) {
a737e835	544	pr_info("disable watchdog\n");
920f91e5 SA	545	ds1374_wdt_disable();
	546	}
	547
	548	if (options & WDIOS_ENABLECARD) {
a737e835	549	pr_info("enable watchdog\n");
920f91e5 SA	550	ds1374_wdt_settimeout(wdt_margin);
	551	ds1374_wdt_ping();
	552	}
	553
	554	return -EINVAL;
	555	}
	556	return -ENOTTY;
	557	}
	558
	559	static long ds1374_wdt_unlocked_ioctl(struct file *file, unsigned int cmd,
	560	unsigned long arg)
	561	{
	562	int ret;
	563	struct ds1374 *ds1374 = i2c_get_clientdata(save_client);
	564
	565	mutex_lock(&ds1374->mutex);
	566	ret = ds1374_wdt_ioctl(file, cmd, arg);
	567	mutex_unlock(&ds1374->mutex);
	568
	569	return ret;
	570	}
	571
	572	static int ds1374_wdt_notify_sys(struct notifier_block *this,
	573	unsigned long code, void *unused)
	574	{
	575	if (code == SYS_DOWN \|\| code == SYS_HALT)
	576	/* Disable Watchdog */
	577	ds1374_wdt_disable();
	578	return NOTIFY_DONE;
	579	}
	580
	581	static const struct file_operations ds1374_wdt_fops = {
	582	.owner = THIS_MODULE,
	583	.read = ds1374_wdt_read,
	584	.unlocked_ioctl = ds1374_wdt_unlocked_ioctl,
	585	.write = ds1374_wdt_write,
	586	.open = ds1374_wdt_open,
	587	.release = ds1374_wdt_release,
	588	.llseek = no_llseek,
	589	};
	590
	591	static struct miscdevice ds1374_miscdev = {
	592	.minor = WATCHDOG_MINOR,
	593	.name = "watchdog",
	594	.fops = &ds1374_wdt_fops,
bf4994d7 SW	595	};
bf4994d7 SW	596
920f91e5 SA	597	static struct notifier_block ds1374_wdt_notifier = {
	598	.notifier_call = ds1374_wdt_notify_sys,
	599	};
	600
	601	#endif /CONFIG_RTC_DRV_DS1374_WDT/
	602	/*
	603	*****************************************************************************
	604	*
	605	* Driver Interface
	606	*
	607	*****************************************************************************
	608	*/
d2653e92 JD	609	static int ds1374_probe(struct i2c_client *client,
d2653e92 JD	610	const struct i2c_device_id *id)
bf4994d7 SW	611	{
	612	struct ds1374 *ds1374;
	613	int ret;
	614
d1a96639	615	ds1374 = devm_kzalloc(&client->dev, sizeof(struct ds1374), GFP_KERNEL);
bf4994d7 SW	616	if (!ds1374)
	617	return -ENOMEM;
	618
	619	ds1374->client = client;
	620	i2c_set_clientdata(client, ds1374);
	621
	622	INIT_WORK(&ds1374->work, ds1374_work);
	623	mutex_init(&ds1374->mutex);
	624
	625	ret = ds1374_check_rtc_status(client);
	626	if (ret)
d1a96639	627	return ret;
bf4994d7	628
b42f9317	629	if (client->irq > 0) {
d1a96639	630	ret = devm_request_irq(&client->dev, client->irq, ds1374_irq, 0,
adc7b9b6	631	"ds1374", client);
bf4994d7 SW	632	if (ret) {
bf4994d7 SW	633	dev_err(&client->dev, "unable to request IRQ\n");
d1a96639	634	return ret;
bf4994d7	635	}
26b3c01f AV	636
26b3c01f AV	637	device_set_wakeup_capable(&client->dev, 1);
bf4994d7 SW	638	}
bf4994d7 SW	639
d1a96639	640	ds1374->rtc = devm_rtc_device_register(&client->dev, client->name,
adc7b9b6	641	&ds1374_rtc_ops, THIS_MODULE);
bf4994d7	642	if (IS_ERR(ds1374->rtc)) {
bf4994d7	643	dev_err(&client->dev, "unable to register the class device\n");
d1a96639	644	return PTR_ERR(ds1374->rtc);
bf4994d7 SW	645	}
bf4994d7 SW	646
920f91e5 SA	647	#ifdef CONFIG_RTC_DRV_DS1374_WDT
	648	save_client = client;
	649	ret = misc_register(&ds1374_miscdev);
	650	if (ret)
	651	return ret;
	652	ret = register_reboot_notifier(&ds1374_wdt_notifier);
	653	if (ret) {
	654	misc_deregister(&ds1374_miscdev);
	655	return ret;
	656	}
	657	ds1374_wdt_settimeout(131072);
	658	#endif
	659
bf4994d7	660	return 0;
bf4994d7 SW	661	}
bf4994d7 SW	662
5a167f45	663	static int ds1374_remove(struct i2c_client *client)
bf4994d7 SW	664	{
bf4994d7 SW	665	struct ds1374 *ds1374 = i2c_get_clientdata(client);
920f91e5	666	#ifdef CONFIG_RTC_DRV_DS1374_WDT
f368ed60 GKH	667	misc_deregister(&ds1374_miscdev);
f368ed60 GKH	668	ds1374_miscdev.parent = NULL;
920f91e5 SA	669	unregister_reboot_notifier(&ds1374_wdt_notifier);
920f91e5 SA	670	#endif
bf4994d7	671
b42f9317	672	if (client->irq > 0) {
bf4994d7 SW	673	mutex_lock(&ds1374->mutex);
	674	ds1374->exiting = 1;
	675	mutex_unlock(&ds1374->mutex);
	676
d1a96639	677	devm_free_irq(&client->dev, client->irq, client);
9db8995b	678	cancel_work_sync(&ds1374->work);
bf4994d7 SW	679	}
bf4994d7 SW	680
bf4994d7 SW	681	return 0;
	682	}
	683
8b80ef64	684	#ifdef CONFIG_PM_SLEEP
bc96ba74	685	static int ds1374_suspend(struct device *dev)
986e36a5	686	{
bc96ba74 MB	687	struct i2c_client *client = to_i2c_client(dev);
bc96ba74 MB	688
0d9030a2	689	if (client->irq > 0 && device_may_wakeup(&client->dev))
986e36a5 MP	690	enable_irq_wake(client->irq);
	691	return 0;
	692	}
	693
bc96ba74	694	static int ds1374_resume(struct device *dev)
986e36a5	695	{
bc96ba74 MB	696	struct i2c_client *client = to_i2c_client(dev);
bc96ba74 MB	697
0d9030a2	698	if (client->irq > 0 && device_may_wakeup(&client->dev))
986e36a5 MP	699	disable_irq_wake(client->irq);
	700	return 0;
	701	}
8b80ef64	702	#endif
bc96ba74 MB	703
	704	static SIMPLE_DEV_PM_OPS(ds1374_pm, ds1374_suspend, ds1374_resume);
	705
bf4994d7 SW	706	static struct i2c_driver ds1374_driver = {
	707	.driver = {
	708	.name = "rtc-ds1374",
8b80ef64	709	.pm = &ds1374_pm,
bf4994d7 SW	710	},
bf4994d7 SW	711	.probe = ds1374_probe,
5a167f45	712	.remove = ds1374_remove,
3760f736	713	.id_table = ds1374_id,
bf4994d7 SW	714	};
bf4994d7 SW	715
0abc9201	716	module_i2c_driver(ds1374_driver);
bf4994d7 SW	717
	718	MODULE_AUTHOR("Scott Wood <scottwood@freescale.com>");
	719	MODULE_DESCRIPTION("Maxim/Dallas DS1374 RTC Driver");
	720	MODULE_LICENSE("GPL");