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 <linux/module.h>#include <linux/fs.h>#include <linux/string.h>#include <linux/init.h>#include <linux/device.h>#include <linux/interrupt.h>#include <linux/rtc.h>#include <linux/bcd.h>#include <asm/hardware.h>#include <asm/uaccess.h>#include <asm/io.h>#include <asm/irq.h>#include <asm/rtc.h>#include <asm/mach/time.h>#include <asm/hardware/clock.h>#include <asm/arch/regs-rtc.h>// 包含RTC_AF的声明#include <linux/mc146818rtc.h>#undef S3C24XX_VA_RTC#define S3C24XX_VA_RTC s3c2440_rtc_basestatic 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 interrupts3c2440_rtc_setpie(0);// 0 - disable alarms3c2440_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#endifstatic 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, <[e-mail]>");MODULE_LICENSE("GPL");

（2）编译成模块形式，加载没问题，卸载时出现如下问题：

（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。