patch-2.1.16 linux/drivers/sbus/char/rtc.c

• Lines: 159
• Date: Fri Dec 13 11:37:32 1996
• Orig file: v2.1.15/linux/drivers/sbus/char/rtc.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.1.15/linux/drivers/sbus/char/rtc.c linux/drivers/sbus/char/rtc.c
@@ -0,0 +1,158 @@
+/* $Id: rtc.c,v 1.6 1996/11/21 16:57:50 jj Exp $
+ *
+ * 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 SPARC Mostek real time clock 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/init.h>
+#include <asm/mostek.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/rtc.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)
+{
+	register struct mostek48t02 *regs = mstk48t02_regs;
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+	regs->creg |= MSTK_CREG_READ;
+
+	t->sec = MSTK_REG_SEC(regs);
+	t->min = MSTK_REG_MIN(regs);
+	t->hour = MSTK_REG_HOUR(regs);
+	t->dow = MSTK_REG_DOW(regs);
+	t->dom = MSTK_REG_DOM(regs);
+	t->month = MSTK_REG_MONTH(regs);
+	t->year = MSTK_CVT_YEAR( MSTK_REG_YEAR(regs) );
+
+	regs->creg &= ~MSTK_CREG_READ;
+	restore_flags(flags);
+}
+
+/* Set the current date and time inthe real time clock. */
+void set_rtc_time(struct rtc_time *t)
+{
+	register struct mostek48t02 *regs = mstk48t02_regs;
+	unsigned long flags;
+
+	save_flags(flags);
+	cli();
+	regs->creg |= MSTK_CREG_WRITE;
+
+	MSTK_SET_REG_SEC(regs,t->sec);
+	MSTK_SET_REG_MIN(regs,t->min);
+	MSTK_SET_REG_HOUR(regs,t->hour);
+	MSTK_SET_REG_DOW(regs,t->dow);
+	MSTK_SET_REG_DOM(regs,t->dom);
+	MSTK_SET_REG_MONTH(regs,t->month);
+	MSTK_SET_REG_YEAR(regs,t->year - MSTK_YEAR_ZERO);
+
+	regs->creg &= ~MSTK_CREG_WRITE;
+	restore_flags(flags);
+}
+
+static long long rtc_lseek(struct inode *inode, struct file *file,
+	long long 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 RTCGET:
+		get_rtc_time(&rtc_tm);
+
+		copy_to_user_ret((struct rtc_time*)arg, &rtc_tm, sizeof(struct rtc_time), -EFAULT);
+
+		return 0;
+
+
+	case RTCSET:
+		if (!suser())
+			return -EPERM;
+
+		copy_from_user_ret(&rtc_tm, (struct rtc_time*)arg, sizeof(struct rtc_time), -EFAULT);
+
+		set_rtc_time(&rtc_tm);
+
+		return 0;
+
+	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 void rtc_release(struct inode *inode, struct file *file)
+{
+	MOD_DEC_USE_COUNT;
+	rtc_busy = 0;
+}
+
+static struct file_operations rtc_fops = {
+	rtc_lseek,
+	NULL,		/* rtc_read */
+	NULL,		/* rtc_write */
+	NULL,		/* rtc_readdir */
+	NULL,		/* rtc_select */
+	rtc_ioctl,
+	NULL,		/* rtc_mmap */
+	rtc_open,
+	rtc_release
+};
+
+static struct miscdevice rtc_dev = { RTC_MINOR, "rtc", &rtc_fops };
+
+#ifdef MODULE
+int init_module(void)
+#else
+__initfunc(int rtc_init(void))
+#endif
+{
+#ifdef MODULE
+	register_symtab(0);
+#endif
+	misc_register(&rtc_dev);
+	return 0;
+}
+
+#ifdef MODULE
+void cleanup_module(void)
+{
+	misc_deregister(&rtc_dev);
+}
+#endif