s2c2440 rtc 平台设备驱动 卸载问题 oops
（1）rtc平台设备驱动源码如下，gzliu_2440_rtc.c：
相关的函数及结构体参见：http://blog.csdn.net/gzliu_hit/article/details/6699277
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
// 包含RTC_AF的声明
#include
#undef S3C24XX_VA_RTC
#define S3C24XX_VA_RTC s3c2440_rtc_base
static struct resource *s3c2440_rtc_mem = NULL;
static void __iomem *s3c2440_rtc_base = NULL;
static int s3c2440_rtc_alarm_irq = NO_IRQ;
static int s3c2440_rtc_tick_irq = NO_IRQ;
static int s3c2440_rtc_freq = 1; // rtc tick中断频率
static DEFINE_SPINLOCK(s3c2440_rtc_pie_lock);
static int s3c2440_rtc_proc(char *buf)
{
unsigned int rtcalm = readb(S3C2410_RTCALM);
unsigned int ticnt = readb (S3C2410_TICNT);
char *p = buf;
printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_proc()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
p += sprintf(p, "alarm_IRQ\t: %s\n", (rtcalm & S3C2410_RTCALM_ALMEN) ? "yes" : "no" );
p += sprintf(p, "periodic_IRQ\t: %s\n", (ticnt & S3C2410_TICNT_ENABLE) ? "yes" : "no" );
p += sprintf(p, "periodic_freq\t: %d\n", s3c2440_rtc_freq);
return p - buf;
}
static int s3c2440_rtc_getalarm(struct rtc_wkalrm *alrm)
{
struct rtc_time *alm_tm = &alrm->time;
unsigned int alm_en;
printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_getalarm()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
alm_tm->tm_sec = readb(S3C2410_ALMSEC);
alm_tm->tm_min = readb(S3C2410_ALMMIN);
alm_tm->tm_hour = readb(S3C2410_ALMHOUR);
alm_tm->tm_mon = readb(S3C2410_ALMMON);
alm_tm->tm_mday = readb(S3C2410_ALMDATE);
alm_tm->tm_year = readb(S3C2410_ALMYEAR);
alm_en = readb(S3C2410_RTCALM);
pr_debug("read alarm %02x %02x.%02x.%02x %02x/%02x/%02x\n", alm_en, alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday, alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
/* decode the alarm enable field */
if (alm_en & S3C2410_RTCALM_SECEN)
{
BCD_TO_BIN(alm_tm->tm_sec);
}
else
{
alm_tm->tm_sec = 0xff;
}
if (alm_en & S3C2410_RTCALM_MINEN)
{
BCD_TO_BIN(alm_tm->tm_min);
}
else
{
alm_tm->tm_min = 0xff;
}
if (alm_en & S3C2410_RTCALM_HOUREN)
{
BCD_TO_BIN(alm_tm->tm_hour);
}
else
{
alm_tm->tm_hour = 0xff;
}
if (alm_en & S3C2410_RTCALM_DAYEN)
{
BCD_TO_BIN(alm_tm->tm_mday);
}
else
{
alm_tm->tm_mday = 0xff;
}
if (alm_en & S3C2410_RTCALM_MONEN)
{
BCD_TO_BIN(alm_tm->tm_mon);
alm_tm->tm_mon -= 1;
}
else
{
alm_tm->tm_mon = 0xff;
}
if (alm_en & S3C2410_RTCALM_YEAREN)
{
BCD_TO_BIN(alm_tm->tm_year);
}
else
{
alm_tm->tm_year = 0xffff;
}
/* todo - set alrm->enabled ? */
return 0;
}/* s3c2440_rtc_getalarm(struct rtc_wkalrm *alrm) */
static int s3c2440_rtc_setalarm(struct rtc_wkalrm *alrm)
{
struct rtc_time *tm = &alrm->time;
unsigned int alrm_en;
printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_setalarm()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
pr_debug("s3c2410_rtc_setalarm: %d, %02x/%02x/%02x %02x.%02x.%02x\n", alrm->enabled, tm->tm_mday & 0xff, tm->tm_mon & 0xff, tm->tm_year & 0xff, tm->tm_hour & 0xff, tm->tm_min & 0xff, tm->tm_sec);
if (alrm->enabled || 1)
{
alrm_en = readb(S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
writeb(0x00, S3C2410_RTCALM);
if (tm->tm_sec < 60 && tm->tm_sec >= 0)
{
alrm_en |= S3C2410_RTCALM_SECEN;
writeb(BIN2BCD(tm->tm_sec), S3C2410_ALMSEC);
}
if (tm->tm_min < 60 && tm->tm_min >= 0)
{
alrm_en |= S3C2410_RTCALM_MINEN;
writeb(BIN2BCD(tm->tm_min), S3C2410_ALMMIN);
}
if (tm->tm_hour < 24 && tm->tm_hour >= 0)
{
alrm_en |= S3C2410_RTCALM_HOUREN;
writeb(BIN2BCD(tm->tm_hour), S3C2410_ALMHOUR);
}
pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
writeb(alrm_en, S3C2410_RTCALM);
enable_irq_wake(s3c2440_rtc_alarm_irq);
}
else
{
alrm_en = readb(S3C2410_RTCALM);
alrm_en &= ~S3C2410_RTCALM_ALMEN;
writeb(alrm_en, S3C2410_RTCALM);
disable_irq_wake(s3c2440_rtc_alarm_irq);
}
return 0;
}/* s3c2440_rtc_setalarm(struct rtc_wkalrm *alrm) */
/* Time read/write */
static int s3c2440_rtc_gettime(struct rtc_time *rtc_tm)
{
unsigned int have_retried = 0;
printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_gettime()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
retry_get_time:
rtc_tm->tm_min = readb(S3C2410_RTCMIN);
rtc_tm->tm_hour = readb(S3C2410_RTCHOUR);
rtc_tm->tm_mday = readb(S3C2410_RTCDATE);
rtc_tm->tm_mon = readb(S3C2410_RTCMON);
rtc_tm->tm_year = readb(S3C2410_RTCYEAR);
rtc_tm->tm_sec = readb(S3C2410_RTCSEC);
/* the only way to work out wether the system was mid-update
* when we read it is to check the second counter, and if it
* is zero, then we re-try the entire read
*/
if (rtc_tm->tm_sec == 0 && !have_retried)
{
have_retried = 1;
goto retry_get_time;
}
pr_debug("read time %02x.%02x.%02x %02x/%02x/%02x\n", rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday, rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
printk("before BCD_TO_BIN: %d-%d-%d %d:%d:%d\n", rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday, rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
BCD_TO_BIN(rtc_tm->tm_sec);
BCD_TO_BIN(rtc_tm->tm_min);
BCD_TO_BIN(rtc_tm->tm_hour);
BCD_TO_BIN(rtc_tm->tm_mday);
BCD_TO_BIN(rtc_tm->tm_mon);
BCD_TO_BIN(rtc_tm->tm_year);
printk("after BCD_TO_BIN: %d-%d-%d %d:%d:%d\n", rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday, rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
// 要保证rtc_tm->tm_year + 1900 == 2011年，rtc_tm->tm_mon + 1 == 8月
rtc_tm->tm_year += 100;
rtc_tm->tm_mon -= 1;
return 0;
}/* s3c2440_rtc_gettime(struct rtc_time *rtc_tm) */
static int s3c2440_rtc_settime(struct rtc_time *tm)
{
printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_settime()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
/* the rtc gets round the y2k problem by just not supporting it */
if (tm->tm_year < 100)
return -EINVAL;
printk("before BIN2BCD: %d-%d-%d %d:%d:%d\n", tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec);
writeb(BIN2BCD(tm->tm_sec), S3C2410_RTCSEC);
writeb(BIN2BCD(tm->tm_min), S3C2410_RTCMIN);
writeb(BIN2BCD(tm->tm_hour), S3C2410_RTCHOUR);
writeb(BIN2BCD(tm->tm_mday), S3C2410_RTCDATE);
writeb(BIN2BCD(tm->tm_mon + 1), S3C2410_RTCMON);
writeb(BIN2BCD(tm->tm_year - 100), S3C2410_RTCYEAR);
return 0;
}
/* Update control registers */
static void s3c2440_rtc_setaie(int to)
{
unsigned int tmp;
printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_setaie()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
pr_debug("%s: aie=%d\n", __FUNCTION__, to);
tmp = readb(S3C2410_RTCALM);
if (to)
{
tmp |= S3C2410_RTCALM_ALMEN;
}
else
{
tmp &= ~S3C2410_RTCALM_ALMEN;
}
writeb(tmp, S3C2410_RTCALM);
}
static void s3c2440_rtc_setfreq(int freq)
{
unsigned int tmp;
printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_setfreq()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
spin_lock_irq(&s3c2440_rtc_pie_lock);
tmp = readb(S3C2410_TICNT) & S3C2410_TICNT_ENABLE;
s3c2440_rtc_freq = freq;
tmp |= (128 / freq)-1;
writeb(tmp, S3C2410_TICNT);
spin_unlock_irq(&s3c2440_rtc_pie_lock);
}/* s3c2440_rtc_setfreq(int freq) */
static void s3c2440_rtc_setpie(int to)
{
unsigned int tmp;
printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_setpie()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
pr_debug("%s: pie=%d\n", __FUNCTION__, to);
spin_lock_irq(&s3c2440_rtc_pie_lock);
tmp = readb(S3C2410_TICNT) & ~S3C2410_TICNT_ENABLE;
if (to)
{
tmp |= S3C2410_TICNT_ENABLE;
}
writeb(tmp, S3C2410_TICNT);
spin_unlock_irq(&s3c2440_rtc_pie_lock);
}
static int s3c2440_rtc_ioctl(unsigned int cmd, unsigned long arg)
{
printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_ioctl()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
switch (cmd)
{
case RTC_AIE_OFF:
case RTC_AIE_ON:
s3c2440_rtc_setaie((cmd == RTC_AIE_ON) ? 1 : 0);
return 0;
case RTC_PIE_OFF:
case RTC_PIE_ON:
s3c2440_rtc_setpie((cmd == RTC_PIE_ON) ? 1 : 0);
return 0;
case RTC_IRQP_READ:
return put_user(s3c2440_rtc_freq, (unsigned long __user *)arg);
case RTC_IRQP_SET:
if (arg < 1 || arg > 64)
return -EINVAL;
if (!capable(CAP_SYS_RESOURCE))
return -EACCES;
/* check for power of 2 */
if ((arg & (arg-1)) != 0)
return -EINVAL;
pr_debug("s3c2440_rtc: setting frequency %ld\n", arg);
s3c2440_rtc_setfreq(arg);
return 0;
case RTC_UIE_ON:
case RTC_UIE_OFF:
return -EINVAL;
}/* switch (cmd) */
return -EINVAL;
}/* s3c2440_rtc_ioctl(unsigned int cmd, unsigned long arg) */
static irqreturn_t s3c2440_rtc_alarmirq(int irq, void *id, struct pt_regs *r)
{
printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_alarmirq()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
rtc_update(1, RTC_AF | RTC_IRQF);
return IRQ_HANDLED;
}
static irqreturn_t s3c2440_rtc_tickirq(int irq, void *id, struct pt_regs *r)
{
printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_tickirq()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
rtc_update(1, RTC_PF | RTC_IRQF);
return IRQ_HANDLED;
}
static int s3c2440_rtc_open(void)
{
int ret;
printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_open()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
ret = request_irq(s3c2440_rtc_alarm_irq, s3c2440_rtc_alarmirq, SA_INTERRUPT, "s3c2440-rtc alarm", NULL);
if (ret)
{
printk(KERN_ERR "IRQ%d already in use\n", s3c2440_rtc_alarm_irq);
}
ret = request_irq(s3c2440_rtc_tick_irq, s3c2440_rtc_tickirq, SA_INTERRUPT, "s3c2440-rtc tick", NULL);
if (ret)
{
printk(KERN_ERR "IRQ%d already in use\n", s3c2440_rtc_tick_irq);
goto tick_err;
}
return ret;
tick_err:
free_irq(s3c2440_rtc_alarm_irq, NULL);
return ret;
}/* s3c2440_rtc_open(void) */
static void s3c2440_rtc_release(void)
{
printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_release()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
/* do not clear AIE here, it may be needed for wake */
s3c2440_rtc_setpie(0);
free_irq(s3c2440_rtc_alarm_irq, NULL);
free_irq(s3c2440_rtc_tick_irq, NULL);
}
static struct rtc_ops s3c2440_rtcops =
{
.owner = THIS_MODULE,
.open = s3c2440_rtc_open,
.release = s3c2440_rtc_release,
.ioctl = s3c2440_rtc_ioctl,
.read_time = s3c2440_rtc_gettime,
.set_time = s3c2440_rtc_settime,
.read_alarm = s3c2440_rtc_getalarm,
.set_alarm = s3c2440_rtc_setalarm,
.proc = s3c2440_rtc_proc,
};
static void s3c2440_rtc_enable(struct device *dev, int en)
{
unsigned int tmp;
printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_enable()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
if (s3c2440_rtc_base == NULL)
{
return;
}
if (!en)
{
tmp = readb(S3C2410_RTCCON);
writeb(tmp & ~S3C2410_RTCCON_RTCEN, S3C2410_RTCCON);
tmp = readb(S3C2410_TICNT);
writeb(tmp & ~S3C2410_TICNT_ENABLE, S3C2410_TICNT);
}
else
{
/* re-enable the device, and check it is ok */
if ((readb(S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0)
{
dev_info(dev, "rtc disabled, re-enabling\n");
tmp = readb(S3C2410_RTCCON);
writeb(tmp | S3C2410_RTCCON_RTCEN , S3C2410_RTCCON);
}
if ((readb(S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL))
{
dev_info(dev, "removing S3C2410_RTCCON_CNTSEL\n");
tmp = readb(S3C2410_RTCCON);
writeb(tmp& ~S3C2410_RTCCON_CNTSEL , S3C2410_RTCCON);
}
if ((readb(S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST))
{
dev_info(dev, "removing S3C2410_RTCCON_CLKRST\n");
tmp = readb(S3C2410_RTCCON);
writeb(tmp & ~S3C2410_RTCCON_CLKRST, S3C2410_RTCCON);
}
}
}/* s3c2440_rtc_enable(struct device *dev, int en) */
static int s3c2440_rtc_probe(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct resource *res;
int ret;
printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_probe()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
pr_debug("%s: probe=%p, device=%p\n", __FUNCTION__, pdev, dev);
/* find the IRQs */
/*
* platform_get_irq()原型：
* 文件 drivers/base/platform.c
* int platform_get_irq(struct platform_device *dev, unsigned int num)
* {
* struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);
*
* return r ? r->start : 0;
* }
* 其中platform_get_resource(dev, IORESOURCE_IRQ, num)获取第num个flags与IORESOURCE_IRQ匹配的资源，
* rtc资源结构体如下，num为1与[2]对应，num为0与[1]对应。
* 文件 arch/arm/mach-s3c2410/devs.c
* static struct resource s3c_rtc_resource[] = {
* [0] = {
* .start = S3C2410_PA_RTC,
* .end = S3C2410_PA_RTC + 0xff,
* .flags = IORESOURCE_MEM,
* },
* [1] = {
* .start = IRQ_RTC,
.end = IRQ_RTC,
.flags = IORESOURCE_IRQ,
* },
* [2] = {
* .start = IRQ_TICK,
* .end = IRQ_TICK,
* .flags = IORESOURCE_IRQ
* }
* };
* 也可直接使用IRQ_RTC，IRQ_TICK对s3c2440_rtc_alarm_irq和s3c2440_rtc_tick_irq赋值。
*/
s3c2440_rtc_tick_irq = platform_get_irq(pdev, 1);
if (s3c2440_rtc_tick_irq <= 0)
{
dev_err(dev, "no irq for rtc tick\n");
return -ENOENT;
}
s3c2440_rtc_alarm_irq = platform_get_irq(pdev, 0);
if (s3c2440_rtc_alarm_irq <= 0)
{
dev_err(dev, "no irq for alarm\n");
return -ENOENT;
}
pr_debug("s3c2440_rtc: tick irq %d, alarm irq %d\n", s3c2440_rtc_tick_irq, s3c2440_rtc_alarm_irq);
/* get the memory region */
/*
* 文件 include/linux/ioport.h
* resource结构体的定义：
* struct resource {
* const char *name;
* unsigned long start, end;
* unsigned long flags;
* struct resource *parent, *sibling, *child;
* };
* platform_get_resource()函数原型：
* 文件 drivers/base/platform.c
* struct resource *platform_get_resource(struct platform_device *dev, unsigned int type, unsigned int num)
* {
* int i;
* for (i = 0; i < dev->num_resources; i++) {
* struct resource *r = &dev->resource[i];
* if ((r->flags & (IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_IRQ | IORESOURCE_DMA)) == type)
* if (num-- == 0)
* return r;
* }
* return NULL;
* }
*/
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res == NULL)
{
dev_err(dev, "failed to get memory region resource\n");
return -ENOENT;
}
/*
* 文件 include/linux/ioport.h
* #define request_mem_region(start,n,name) __request_region(&iomem_resource, (start), (n), (name))
* 其中的iomem_resource：
* 文件 kernel/resource.c
* struct resource iomem_resource = {
* .name = "PCI mem",
* .start = 0UL,
* .end = ~0UL,
* .flags = IORESOURCE_MEM,
* };
*/
s3c2440_rtc_mem = request_mem_region(res->start, res->end-res->start+1, pdev->name);
if (s3c2440_rtc_mem == NULL)
{
dev_err(dev, "failed to reserve memory region\n");
ret = -ENOENT;
goto exit_err;
}
s3c2440_rtc_base = ioremap(res->start, res->end - res->start + 1);
if (s3c2440_rtc_base == NULL)
{
dev_err(dev, "failed ioremap()\n");
ret = -EINVAL;
goto exit_err;
}
// 是用linux源码中的s3c2410-rtc.c移植的，不知道为什么要写这么一行，没看出有什么用。
//s3c2440_rtc_mem = res;
// 导致卸载时出现"Internal error: Oops: 13 [#1]"
pr_debug("s3c2440_rtc_base=%p\n", s3c2440_rtc_base);
pr_debug("s3c2440_rtc: RTCCON=%02x\n", readb(S3C2410_RTCCON));
/* check to see if everything is setup correctly */
s3c2440_rtc_enable(dev, 1);
pr_debug("s3c2440_rtc: RTCCON=%02x\n", readb(S3C2410_RTCCON));
/*
* s3c2440a手册中描述：
* TICK TIME INTERRUPT
* The RTC tick time is used for interrupt request. The TICNT register has an interrupt enable bit and the count value for
* the interrupt. The count value reaches '0' when the tick time interrupt occurs. Then the period of interrupt is as
* follows:
* — Period = ( n+1 ) / 128 second
* — n: Tick time count value (1~127)
* 此函数将rtc的tick中断时间间隔设置为：(1/s3c2440_rtc_freq)second，即1s
*/
s3c2440_rtc_setfreq(s3c2440_rtc_freq);
// 注册rtc设备，并且创建/proc中的节点，将s3c2440_rtc_proc与该节点绑定。
register_rtc(&s3c2440_rtcops);
return 0;
exit_err:
dev_err(dev, "error %d during initialisation\n", ret);
return ret;
}/* s3c2440_rtc_probe(struct device *dev) */
static int s3c2440_rtc_remove(struct device *dev)
{
printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_remove()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
unregister_rtc(&s3c2440_rtcops);
// 0 - disable tick time interrupt
s3c2440_rtc_setpie(0);
// 0 - disable alarm
s3c2440_rtc_setaie(0);
if (s3c2440_rtc_mem != NULL)
{
pr_debug("s3c2440_rtc: releasing s3c2440_rtc_mem\n");
iounmap(s3c2440_rtc_base);
release_resource(s3c2440_rtc_mem);
kfree(s3c2440_rtc_mem);
}
return 0;
}
#ifdef CONFIG_PM
/* S3C2440 RTC 电源管理控制 */
static struct timespec s3c2440_rtc_delta;
static int ticnt_save;
static int s3c2440_rtc_suspend(struct device *dev, pm_message_t state, u32 level)
{
struct rtc_time tm;
struct timespec time;
printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_suspend()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
time.tv_nsec = 0;
if (level == SUSPEND_POWER_DOWN)
{
/* save TICNT for anyone using periodic interrupts */
ticnt_save = readb(S3C2410_TICNT);
/* calculate time delta for suspend */
s3c2440_rtc_gettime(&tm);
rtc_tm_to_time(&tm, &time.tv_sec);
save_time_delta(&s3c2440_rtc_delta, &time);
s3c2440_rtc_enable(dev, 0);
}
return 0;
}
static int s3c2440_rtc_resume(struct device *dev, u32 level)
{
struct rtc_time tm;
struct timespec time;
printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_resume()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
time.tv_nsec = 0;
s3c2440_rtc_enable(dev, 1);
s3c2440_rtc_gettime(&tm);
rtc_tm_to_time(&tm, &time.tv_sec);
restore_time_delta(&s3c2440_rtc_delta, &time);
writeb(ticnt_save, S3C2410_TICNT);
return 0;
}
#else
#define s3c2440_rtc_suspend NULL
#define s3c2440_rtc_resume NULL
#endif
static struct device_driver s3c2440_rtcdrv =
{
.name = "s3c2440-rtc",
.bus = &platform_bus_type,
.probe = s3c2440_rtc_probe,
.remove = s3c2440_rtc_remove,
.suspend = s3c2440_rtc_suspend,
.resume = s3c2440_rtc_resume,
};
static int __init s3c2440_rtc_init(void)
{
printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_init()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
return driver_register(&s3c2440_rtcdrv);
}
static void __exit s3c2440_rtc_exit(void)
{
printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_exit()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
driver_unregister(&s3c2440_rtcdrv);
}
module_init(s3c2440_rtc_init);
module_exit(s3c2440_rtc_exit);
MODULE_DESCRIPTION("S3C2440 RTC Driver");
MODULE_AUTHOR("gzLiu, ");
MODULE_LICENSE("GPL");
（3）经检查源码，发现问题处在上面源码中580行，注释掉就好了。