Revision a3f9bcab509a4bf003942e7e2048904cfe7cb5c5 authored by Rahul Sharma on 20 November 2012, 11:28:26 UTC, committed by Inki Dae on 05 December 2012, 05:39:21 UTC
This patch is to preserve the display mode header during the mode adjustment. Display mode header is overwritten with the adjusted mode header which is throwing the stack dump. Signed-off-by: Rahul Sharma <rahul.sharma@samsung.com> Signed-off-by: Inki Dae <inki.dae@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
1 parent 3dc5fa9
rtc-ds1216.c
/*
* Dallas DS1216 RTC driver
*
* Copyright (c) 2007 Thomas Bogendoerfer
*
*/
#include <linux/module.h>
#include <linux/rtc.h>
#include <linux/platform_device.h>
#include <linux/bcd.h>
#include <linux/slab.h>
#define DRV_VERSION "0.2"
struct ds1216_regs {
u8 tsec;
u8 sec;
u8 min;
u8 hour;
u8 wday;
u8 mday;
u8 month;
u8 year;
};
#define DS1216_HOUR_1224 (1 << 7)
#define DS1216_HOUR_AMPM (1 << 5)
struct ds1216_priv {
struct rtc_device *rtc;
void __iomem *ioaddr;
size_t size;
unsigned long baseaddr;
};
static const u8 magic[] = {
0xc5, 0x3a, 0xa3, 0x5c, 0xc5, 0x3a, 0xa3, 0x5c
};
/*
* Read the 64 bit we'd like to have - It a series
* of 64 bits showing up in the LSB of the base register.
*
*/
static void ds1216_read(u8 __iomem *ioaddr, u8 *buf)
{
unsigned char c;
int i, j;
for (i = 0; i < 8; i++) {
c = 0;
for (j = 0; j < 8; j++)
c |= (readb(ioaddr) & 0x1) << j;
buf[i] = c;
}
}
static void ds1216_write(u8 __iomem *ioaddr, const u8 *buf)
{
unsigned char c;
int i, j;
for (i = 0; i < 8; i++) {
c = buf[i];
for (j = 0; j < 8; j++) {
writeb(c, ioaddr);
c = c >> 1;
}
}
}
static void ds1216_switch_ds_to_clock(u8 __iomem *ioaddr)
{
/* Reset magic pointer */
readb(ioaddr);
/* Write 64 bit magic to DS1216 */
ds1216_write(ioaddr, magic);
}
static int ds1216_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct platform_device *pdev = to_platform_device(dev);
struct ds1216_priv *priv = platform_get_drvdata(pdev);
struct ds1216_regs regs;
ds1216_switch_ds_to_clock(priv->ioaddr);
ds1216_read(priv->ioaddr, (u8 *)®s);
tm->tm_sec = bcd2bin(regs.sec);
tm->tm_min = bcd2bin(regs.min);
if (regs.hour & DS1216_HOUR_1224) {
/* AM/PM mode */
tm->tm_hour = bcd2bin(regs.hour & 0x1f);
if (regs.hour & DS1216_HOUR_AMPM)
tm->tm_hour += 12;
} else
tm->tm_hour = bcd2bin(regs.hour & 0x3f);
tm->tm_wday = (regs.wday & 7) - 1;
tm->tm_mday = bcd2bin(regs.mday & 0x3f);
tm->tm_mon = bcd2bin(regs.month & 0x1f);
tm->tm_year = bcd2bin(regs.year);
if (tm->tm_year < 70)
tm->tm_year += 100;
return rtc_valid_tm(tm);
}
static int ds1216_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct platform_device *pdev = to_platform_device(dev);
struct ds1216_priv *priv = platform_get_drvdata(pdev);
struct ds1216_regs regs;
ds1216_switch_ds_to_clock(priv->ioaddr);
ds1216_read(priv->ioaddr, (u8 *)®s);
regs.tsec = 0; /* clear 0.1 and 0.01 seconds */
regs.sec = bin2bcd(tm->tm_sec);
regs.min = bin2bcd(tm->tm_min);
regs.hour &= DS1216_HOUR_1224;
if (regs.hour && tm->tm_hour > 12) {
regs.hour |= DS1216_HOUR_AMPM;
tm->tm_hour -= 12;
}
regs.hour |= bin2bcd(tm->tm_hour);
regs.wday &= ~7;
regs.wday |= tm->tm_wday;
regs.mday = bin2bcd(tm->tm_mday);
regs.month = bin2bcd(tm->tm_mon);
regs.year = bin2bcd(tm->tm_year % 100);
ds1216_switch_ds_to_clock(priv->ioaddr);
ds1216_write(priv->ioaddr, (u8 *)®s);
return 0;
}
static const struct rtc_class_ops ds1216_rtc_ops = {
.read_time = ds1216_rtc_read_time,
.set_time = ds1216_rtc_set_time,
};
static int __init ds1216_rtc_probe(struct platform_device *pdev)
{
struct resource *res;
struct ds1216_priv *priv;
int ret = 0;
u8 dummy[8];
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENODEV;
priv = kzalloc(sizeof *priv, GFP_KERNEL);
if (!priv)
return -ENOMEM;
platform_set_drvdata(pdev, priv);
priv->size = resource_size(res);
if (!request_mem_region(res->start, priv->size, pdev->name)) {
ret = -EBUSY;
goto out;
}
priv->baseaddr = res->start;
priv->ioaddr = ioremap(priv->baseaddr, priv->size);
if (!priv->ioaddr) {
ret = -ENOMEM;
goto out;
}
priv->rtc = rtc_device_register("ds1216", &pdev->dev,
&ds1216_rtc_ops, THIS_MODULE);
if (IS_ERR(priv->rtc)) {
ret = PTR_ERR(priv->rtc);
goto out;
}
/* dummy read to get clock into a known state */
ds1216_read(priv->ioaddr, dummy);
return 0;
out:
if (priv->ioaddr)
iounmap(priv->ioaddr);
if (priv->baseaddr)
release_mem_region(priv->baseaddr, priv->size);
kfree(priv);
return ret;
}
static int __exit ds1216_rtc_remove(struct platform_device *pdev)
{
struct ds1216_priv *priv = platform_get_drvdata(pdev);
rtc_device_unregister(priv->rtc);
iounmap(priv->ioaddr);
release_mem_region(priv->baseaddr, priv->size);
kfree(priv);
return 0;
}
static struct platform_driver ds1216_rtc_platform_driver = {
.driver = {
.name = "rtc-ds1216",
.owner = THIS_MODULE,
},
.remove = __exit_p(ds1216_rtc_remove),
};
static int __init ds1216_rtc_init(void)
{
return platform_driver_probe(&ds1216_rtc_platform_driver, ds1216_rtc_probe);
}
static void __exit ds1216_rtc_exit(void)
{
platform_driver_unregister(&ds1216_rtc_platform_driver);
}
MODULE_AUTHOR("Thomas Bogendoerfer <tsbogend@alpha.franken.de>");
MODULE_DESCRIPTION("DS1216 RTC driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
MODULE_ALIAS("platform:rtc-ds1216");
module_init(ds1216_rtc_init);
module_exit(ds1216_rtc_exit);
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