patch-2.4.0-test9 linux/drivers/macintosh/rtc.c

• Lines: 158
• Date: Tue Sep 19 08:31:53 2000
• Orig file: v2.4.0-test8/linux/drivers/macintosh/rtc.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test8/linux/drivers/macintosh/rtc.c linux/drivers/macintosh/rtc.c
@@ -0,0 +1,157 @@
+/*
+ * Linux/PowerPC Real Time Clock Driver
+ *
+ * heavily based on:
+ * Linux/SPARC Real Time Clock Driver
+ * Copyright (C) 1996 Thomas K. Dyas (tdyas@eden.rutgers.edu)
+ *
+ * This is a little driver that lets a user-level program access
+ * the PPC clocks chip. It is no use unless you
+ * use the modified clock utility.
+ *
+ * Get the modified clock utility from:
+ *   ftp://vger.rutgers.edu/pub/linux/Sparc/userland/clock.c
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/miscdevice.h>
+#include <linux/malloc.h>
+#include <linux/fcntl.h>
+#include <linux/poll.h>
+#include <linux/init.h>
+#include <linux/mc146818rtc.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/machdep.h>
+
+#include <asm/time.h>
+
+static int rtc_busy = 0;
+
+/* Retrieve the current date and time from the real time clock. */
+void get_rtc_time(struct rtc_time *t)
+{
+	unsigned long nowtime;
+    
+	nowtime = (ppc_md.get_rtc_time)();
+
+	to_tm(nowtime, t);
+
+	t->tm_year -= 1900;
+	t->tm_mon -= 1;
+	t->tm_wday -= 1;
+}
+
+/* Set the current date and time in the real time clock. */
+void set_rtc_time(struct rtc_time *t)
+{
+	unsigned long nowtime;
+
+	printk(KERN_INFO "rtc.c:set_rtc_time: %04d-%02d-%02d %02d:%02d:%02d.\n", t->tm_year+1900, t->tm_mon+1, t->tm_mday, t->tm_hour, t->tm_min, t->tm_sec);
+
+	nowtime = mktime(t->tm_year+1900, t->tm_mon+1, t->tm_mday, t->tm_hour, t->tm_min, t->tm_sec);
+
+	printk(KERN_INFO "rtc.c:set_rtc_time: set rtc time to %ld seconds.\n", nowtime);
+
+	(ppc_md.set_rtc_time)(nowtime);
+}
+
+static loff_t rtc_lseek(struct file *file, loff_t offset, int origin)
+{
+	return -ESPIPE;
+}
+
+static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
+	unsigned long arg)
+{
+	struct rtc_time rtc_tm;
+
+	switch (cmd)
+	{
+	case RTC_RD_TIME:
+		if (ppc_md.get_rtc_time)
+		{
+			get_rtc_time(&rtc_tm);
+
+			if (copy_to_user((struct rtc_time*)arg, &rtc_tm, sizeof(struct rtc_time)))
+				return -EFAULT;
+
+			return 0;
+		}
+		else
+			return -EINVAL;
+
+	case RTC_SET_TIME:
+		if (!capable(CAP_SYS_TIME))
+			return -EPERM;
+
+		if (ppc_md.set_rtc_time)
+		{
+			if (copy_from_user(&rtc_tm, (struct rtc_time*)arg, sizeof(struct rtc_time)))
+				return -EFAULT;
+
+			set_rtc_time(&rtc_tm);
+
+			return 0;
+		}
+		else
+			return -EINVAL;
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static int rtc_open(struct inode *inode, struct file *file)
+{
+	if (rtc_busy)
+		return -EBUSY;
+
+	rtc_busy = 1;
+
+	MOD_INC_USE_COUNT;
+
+	return 0;
+}
+
+static int rtc_release(struct inode *inode, struct file *file)
+{
+	MOD_DEC_USE_COUNT;
+	rtc_busy = 0;
+	return 0;
+}
+
+static struct file_operations rtc_fops = {
+	owner:		THIS_MODULE,
+	llseek:		rtc_lseek,
+	ioctl:		rtc_ioctl,
+	open:		rtc_open,
+	release:	rtc_release
+};
+
+static struct miscdevice rtc_dev = { RTC_MINOR, "rtc", &rtc_fops };
+
+EXPORT_NO_SYMBOLS;
+
+static int __init rtc_init(void)
+{
+	int error;
+
+	error = misc_register(&rtc_dev);
+	if (error) {
+		printk(KERN_ERR "rtc: unable to get misc minor\n");
+		return error;
+	}
+
+	return 0;
+}
+
+static void __exit rtc_exit(void)
+{
+	misc_deregister(&rtc_dev);
+}
+
+module_init(rtc_init);
+module_exit(rtc_exit);