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authorAlessandro Zummo <a.zummo@towertech.it>2009-08-20 12:31:49 +0900
committerPaul Mundt <lethal@linux-sh.org>2009-08-20 12:31:49 +0900
commit2bfc3305f6b3e08645f7d6b9514211d955b02698 (patch)
tree04bea317e1207140503ec964e98e42ee7f343c73 /drivers/rtc/rtc-ds1302.c
parent307646c958f0f3c3624368eaa72dce8567b25f93 (diff)
rtc: rtc-ds1302 fixes
- removed spinlock protection, it's handled by the rtc class - use platform_driver_probe - return appropriate code for rtc_read_time - style issues Signed-off-by: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'drivers/rtc/rtc-ds1302.c')
-rw-r--r--drivers/rtc/rtc-ds1302.c66
1 files changed, 15 insertions, 51 deletions
diff --git a/drivers/rtc/rtc-ds1302.c b/drivers/rtc/rtc-ds1302.c
index 184556620778..c64e2d7871b2 100644
--- a/drivers/rtc/rtc-ds1302.c
+++ b/drivers/rtc/rtc-ds1302.c
@@ -1,26 +1,25 @@
/*
* Dallas DS1302 RTC Support
*
- * Copyright (C) 2002 David McCullough
- * Copyright (C) 2003 - 2007 Paul Mundt
+ * Copyright (C) 2002 David McCullough
+ * Copyright (C) 2003 - 2007 Paul Mundt
*
* This file is subject to the terms and conditions of the GNU General Public
- * License version 2. See the file "COPYING" in the main directory of
+ * License version 2. See the file "COPYING" in the main directory of
* this archive for more details.
*/
+
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
-#include <linux/time.h>
#include <linux/rtc.h>
-#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/bcd.h>
#include <asm/rtc.h>
#define DRV_NAME "rtc-ds1302"
-#define DRV_VERSION "0.1.0"
+#define DRV_VERSION "0.1.1"
#define RTC_CMD_READ 0x81 /* Read command */
#define RTC_CMD_WRITE 0x80 /* Write command */
@@ -47,11 +46,6 @@
#error "Add support for your platform"
#endif
-struct ds1302_rtc {
- struct rtc_device *rtc_dev;
- spinlock_t lock;
-};
-
static void ds1302_sendbits(unsigned int val)
{
int i;
@@ -105,8 +99,6 @@ static int ds1302_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct ds1302_rtc *rtc = dev_get_drvdata(dev);
- spin_lock_irq(&rtc->lock);
-
tm->tm_sec = bcd2bin(ds1302_readbyte(RTC_ADDR_SEC));
tm->tm_min = bcd2bin(ds1302_readbyte(RTC_ADDR_MIN));
tm->tm_hour = bcd2bin(ds1302_readbyte(RTC_ADDR_HOUR));
@@ -118,26 +110,17 @@ static int ds1302_rtc_read_time(struct device *dev, struct rtc_time *tm)
if (tm->tm_year < 70)
tm->tm_year += 100;
- spin_unlock_irq(&rtc->lock);
-
dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
"mday=%d, mon=%d, year=%d, wday=%d\n",
__func__,
tm->tm_sec, tm->tm_min, tm->tm_hour,
tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday);
- if (rtc_valid_tm(tm) < 0)
- dev_err(dev, "invalid date\n");
-
- return 0;
+ return rtc_valid_tm(tm);
}
static int ds1302_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
- struct ds1302_rtc *rtc = dev_get_drvdata(dev);
-
- spin_lock_irq(&rtc->lock);
-
/* Stop RTC */
ds1302_writebyte(RTC_ADDR_SEC, ds1302_readbyte(RTC_ADDR_SEC) | 0x80);
@@ -152,8 +135,6 @@ static int ds1302_rtc_set_time(struct device *dev, struct rtc_time *tm)
/* Start RTC */
ds1302_writebyte(RTC_ADDR_SEC, ds1302_readbyte(RTC_ADDR_SEC) & ~0x80);
- spin_unlock_irq(&rtc->lock);
-
return 0;
}
@@ -170,9 +151,7 @@ static int ds1302_rtc_ioctl(struct device *dev, unsigned int cmd,
if (copy_from_user(&tcs_val, (int __user *)arg, sizeof(int)))
return -EFAULT;
- spin_lock_irq(&rtc->lock);
ds1302_writebyte(RTC_ADDR_TCR, (0xa0 | tcs_val * 0xf));
- spin_unlock_irq(&rtc->lock);
return 0;
}
#endif
@@ -187,9 +166,9 @@ static struct rtc_class_ops ds1302_rtc_ops = {
.ioctl = ds1302_rtc_ioctl,
};
-static int __devinit ds1302_rtc_probe(struct platform_device *pdev)
+static int __init ds1302_rtc_probe(struct platform_device *pdev)
{
- struct ds1302_rtc *rtc;
+ struct rtc_device *rtc;
int ret;
/* Reset */
@@ -200,37 +179,23 @@ static int __devinit ds1302_rtc_probe(struct platform_device *pdev)
if (ds1302_readbyte(RTC_ADDR_RAM0) != 0x42)
return -ENODEV;
- rtc = kzalloc(sizeof(struct ds1302_rtc), GFP_KERNEL);
- if (unlikely(!rtc))
- return -ENOMEM;
-
- spin_lock_init(&rtc->lock);
- rtc->rtc_dev = rtc_device_register("ds1302", &pdev->dev,
+ rtc = rtc_device_register("ds1302", &pdev->dev,
&ds1302_rtc_ops, THIS_MODULE);
- if (IS_ERR(rtc->rtc_dev)) {
- ret = PTR_ERR(rtc->rtc_dev);
- goto out;
- }
+ if (IS_ERR(rtc))
+ return PTR_ERR(rtc);
platform_set_drvdata(pdev, rtc);
return 0;
-out:
- kfree(rtc);
- return ret;
}
static int __devexit ds1302_rtc_remove(struct platform_device *pdev)
{
- struct ds1302_rtc *rtc = platform_get_drvdata(pdev);
-
- if (likely(rtc->rtc_dev))
- rtc_device_unregister(rtc->rtc_dev);
+ struct rtc_device *rtc = platform_get_drvdata(pdev);
+ rtc_device_unregister(rtc);
platform_set_drvdata(pdev, NULL);
- kfree(rtc);
-
return 0;
}
@@ -239,13 +204,12 @@ static struct platform_driver ds1302_platform_driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
},
- .probe = ds1302_rtc_probe,
- .remove = __devexit_p(ds1302_rtc_remove),
+ .remove = __exit_p(ds1302_rtc_remove),
};
static int __init ds1302_rtc_init(void)
{
- return platform_driver_register(&ds1302_platform_driver);
+ return platform_driver_probe(&ds1302_platform_driver, ds1302_rtc_probe);
}
static void __exit ds1302_rtc_exit(void)