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579 lines
14 KiB
C
579 lines
14 KiB
C
![]() |
/*
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* DS1286 Real Time Clock interface for Linux
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*
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* Copyright (C) 1998, 1999, 2000 Ralf Baechle
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*
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* Based on code written by Paul Gortmaker.
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*
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* This driver allows use of the real time clock (built into nearly all
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* computers) from user space. It exports the /dev/rtc interface supporting
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* various ioctl() and also the /proc/rtc pseudo-file for status
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* information.
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*
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* The ioctls can be used to set the interrupt behaviour and generation rate
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* from the RTC via IRQ 8. Then the /dev/rtc interface can be used to make
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* use of these timer interrupts, be they interval or alarm based.
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*
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* The /dev/rtc interface will block on reads until an interrupt has been
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* received. If a RTC interrupt has already happened, it will output an
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* unsigned long and then block. The output value contains the interrupt
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* status in the low byte and the number of interrupts since the last read
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* in the remaining high bytes. The /dev/rtc interface can also be used with
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* the select(2) call.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/ds1286.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/miscdevice.h>
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#include <linux/slab.h>
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#include <linux/ioport.h>
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#include <linux/fcntl.h>
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#include <linux/init.h>
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#include <linux/poll.h>
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#include <linux/rtc.h>
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#include <linux/spinlock.h>
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#include <linux/bcd.h>
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#include <linux/proc_fs.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#define DS1286_VERSION "1.0"
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/*
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* We sponge a minor off of the misc major. No need slurping
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* up another valuable major dev number for this. If you add
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* an ioctl, make sure you don't conflict with SPARC's RTC
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* ioctls.
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*/
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static DECLARE_WAIT_QUEUE_HEAD(ds1286_wait);
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static ssize_t ds1286_read(struct file *file, char *buf,
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size_t count, loff_t *ppos);
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static int ds1286_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, unsigned long arg);
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static unsigned int ds1286_poll(struct file *file, poll_table *wait);
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static void ds1286_get_alm_time (struct rtc_time *alm_tm);
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static void ds1286_get_time(struct rtc_time *rtc_tm);
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static int ds1286_set_time(struct rtc_time *rtc_tm);
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static inline unsigned char ds1286_is_updating(void);
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static DEFINE_SPINLOCK(ds1286_lock);
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static int ds1286_read_proc(char *page, char **start, off_t off,
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int count, int *eof, void *data);
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/*
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* Bits in rtc_status. (7 bits of room for future expansion)
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*/
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#define RTC_IS_OPEN 0x01 /* means /dev/rtc is in use */
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#define RTC_TIMER_ON 0x02 /* missed irq timer active */
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static unsigned char ds1286_status; /* bitmapped status byte. */
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static unsigned char days_in_mo[] = {
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0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
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};
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/*
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* Now all the various file operations that we export.
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*/
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static ssize_t ds1286_read(struct file *file, char *buf,
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size_t count, loff_t *ppos)
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{
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return -EIO;
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}
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static int ds1286_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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struct rtc_time wtime;
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switch (cmd) {
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case RTC_AIE_OFF: /* Mask alarm int. enab. bit */
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{
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unsigned int flags;
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unsigned char val;
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if (!capable(CAP_SYS_TIME))
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return -EACCES;
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spin_lock_irqsave(&ds1286_lock, flags);
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val = rtc_read(RTC_CMD);
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val |= RTC_TDM;
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rtc_write(val, RTC_CMD);
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spin_unlock_irqrestore(&ds1286_lock, flags);
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return 0;
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}
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case RTC_AIE_ON: /* Allow alarm interrupts. */
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{
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unsigned int flags;
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unsigned char val;
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if (!capable(CAP_SYS_TIME))
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return -EACCES;
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spin_lock_irqsave(&ds1286_lock, flags);
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val = rtc_read(RTC_CMD);
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val &= ~RTC_TDM;
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rtc_write(val, RTC_CMD);
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spin_unlock_irqrestore(&ds1286_lock, flags);
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return 0;
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}
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case RTC_WIE_OFF: /* Mask watchdog int. enab. bit */
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{
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unsigned int flags;
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unsigned char val;
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if (!capable(CAP_SYS_TIME))
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return -EACCES;
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spin_lock_irqsave(&ds1286_lock, flags);
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val = rtc_read(RTC_CMD);
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val |= RTC_WAM;
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rtc_write(val, RTC_CMD);
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spin_unlock_irqrestore(&ds1286_lock, flags);
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return 0;
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}
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case RTC_WIE_ON: /* Allow watchdog interrupts. */
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{
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unsigned int flags;
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unsigned char val;
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if (!capable(CAP_SYS_TIME))
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return -EACCES;
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spin_lock_irqsave(&ds1286_lock, flags);
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val = rtc_read(RTC_CMD);
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val &= ~RTC_WAM;
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rtc_write(val, RTC_CMD);
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spin_unlock_irqrestore(&ds1286_lock, flags);
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return 0;
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}
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case RTC_ALM_READ: /* Read the present alarm time */
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{
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/*
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* This returns a struct rtc_time. Reading >= 0xc0
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* means "don't care" or "match all". Only the tm_hour,
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* tm_min, and tm_sec values are filled in.
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*/
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memset(&wtime, 0, sizeof(wtime));
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ds1286_get_alm_time(&wtime);
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break;
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}
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case RTC_ALM_SET: /* Store a time into the alarm */
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{
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/*
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* This expects a struct rtc_time. Writing 0xff means
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* "don't care" or "match all". Only the tm_hour,
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* tm_min and tm_sec are used.
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*/
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unsigned char hrs, min, sec;
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struct rtc_time alm_tm;
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if (!capable(CAP_SYS_TIME))
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return -EACCES;
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if (copy_from_user(&alm_tm, (struct rtc_time*)arg,
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sizeof(struct rtc_time)))
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return -EFAULT;
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hrs = alm_tm.tm_hour;
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min = alm_tm.tm_min;
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if (hrs >= 24)
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hrs = 0xff;
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if (min >= 60)
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min = 0xff;
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BIN_TO_BCD(sec);
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BIN_TO_BCD(min);
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BIN_TO_BCD(hrs);
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spin_lock(&ds1286_lock);
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rtc_write(hrs, RTC_HOURS_ALARM);
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rtc_write(min, RTC_MINUTES_ALARM);
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spin_unlock(&ds1286_lock);
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return 0;
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}
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case RTC_RD_TIME: /* Read the time/date from RTC */
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{
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memset(&wtime, 0, sizeof(wtime));
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ds1286_get_time(&wtime);
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break;
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}
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case RTC_SET_TIME: /* Set the RTC */
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{
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struct rtc_time rtc_tm;
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if (!capable(CAP_SYS_TIME))
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return -EACCES;
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if (copy_from_user(&rtc_tm, (struct rtc_time*)arg,
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sizeof(struct rtc_time)))
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return -EFAULT;
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return ds1286_set_time(&rtc_tm);
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}
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default:
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return -EINVAL;
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}
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return copy_to_user((void *)arg, &wtime, sizeof wtime) ? -EFAULT : 0;
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}
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/*
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* We enforce only one user at a time here with the open/close.
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* Also clear the previous interrupt data on an open, and clean
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* up things on a close.
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*/
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static int ds1286_open(struct inode *inode, struct file *file)
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{
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spin_lock_irq(&ds1286_lock);
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if (ds1286_status & RTC_IS_OPEN)
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goto out_busy;
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ds1286_status |= RTC_IS_OPEN;
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spin_unlock_irq(&ds1286_lock);
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return 0;
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out_busy:
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spin_lock_irq(&ds1286_lock);
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return -EBUSY;
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}
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static int ds1286_release(struct inode *inode, struct file *file)
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{
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ds1286_status &= ~RTC_IS_OPEN;
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return 0;
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}
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static unsigned int ds1286_poll(struct file *file, poll_table *wait)
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{
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poll_wait(file, &ds1286_wait, wait);
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return 0;
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}
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/*
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* The various file operations we support.
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*/
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static struct file_operations ds1286_fops = {
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.llseek = no_llseek,
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.read = ds1286_read,
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.poll = ds1286_poll,
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.ioctl = ds1286_ioctl,
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.open = ds1286_open,
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.release = ds1286_release,
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};
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static struct miscdevice ds1286_dev=
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{
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.minor = RTC_MINOR,
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.name = "rtc",
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.fops = &ds1286_fops,
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};
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static int __init ds1286_init(void)
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{
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int err;
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printk(KERN_INFO "DS1286 Real Time Clock Driver v%s\n", DS1286_VERSION);
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err = misc_register(&ds1286_dev);
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if (err)
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goto out;
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if (!create_proc_read_entry("driver/rtc", 0, 0, ds1286_read_proc, NULL)) {
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err = -ENOMEM;
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goto out_deregister;
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}
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return 0;
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out_deregister:
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misc_deregister(&ds1286_dev);
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out:
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return err;
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}
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static void __exit ds1286_exit(void)
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{
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remove_proc_entry("driver/rtc", NULL);
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misc_deregister(&ds1286_dev);
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}
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static char *days[] = {
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"***", "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
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};
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/*
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* Info exported via "/proc/rtc".
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*/
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static int ds1286_proc_output(char *buf)
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{
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char *p, *s;
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struct rtc_time tm;
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unsigned char hundredth, month, cmd, amode;
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p = buf;
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ds1286_get_time(&tm);
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hundredth = rtc_read(RTC_HUNDREDTH_SECOND);
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BCD_TO_BIN(hundredth);
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p += sprintf(p,
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"rtc_time\t: %02d:%02d:%02d.%02d\n"
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"rtc_date\t: %04d-%02d-%02d\n",
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tm.tm_hour, tm.tm_min, tm.tm_sec, hundredth,
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tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
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/*
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* We implicitly assume 24hr mode here. Alarm values >= 0xc0 will
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* match any value for that particular field. Values that are
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* greater than a valid time, but less than 0xc0 shouldn't appear.
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*/
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ds1286_get_alm_time(&tm);
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p += sprintf(p, "alarm\t\t: %s ", days[tm.tm_wday]);
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if (tm.tm_hour <= 24)
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p += sprintf(p, "%02d:", tm.tm_hour);
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else
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p += sprintf(p, "**:");
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if (tm.tm_min <= 59)
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p += sprintf(p, "%02d\n", tm.tm_min);
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else
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p += sprintf(p, "**\n");
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month = rtc_read(RTC_MONTH);
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p += sprintf(p,
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"oscillator\t: %s\n"
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"square_wave\t: %s\n",
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(month & RTC_EOSC) ? "disabled" : "enabled",
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(month & RTC_ESQW) ? "disabled" : "enabled");
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|
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amode = ((rtc_read(RTC_MINUTES_ALARM) & 0x80) >> 5) |
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((rtc_read(RTC_HOURS_ALARM) & 0x80) >> 6) |
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((rtc_read(RTC_DAY_ALARM) & 0x80) >> 7);
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if (amode == 7) s = "each minute";
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else if (amode == 3) s = "minutes match";
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else if (amode == 1) s = "hours and minutes match";
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else if (amode == 0) s = "days, hours and minutes match";
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else s = "invalid";
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p += sprintf(p, "alarm_mode\t: %s\n", s);
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|
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cmd = rtc_read(RTC_CMD);
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p += sprintf(p,
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"alarm_enable\t: %s\n"
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"wdog_alarm\t: %s\n"
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"alarm_mask\t: %s\n"
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"wdog_alarm_mask\t: %s\n"
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"interrupt_mode\t: %s\n"
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"INTB_mode\t: %s_active\n"
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"interrupt_pins\t: %s\n",
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(cmd & RTC_TDF) ? "yes" : "no",
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(cmd & RTC_WAF) ? "yes" : "no",
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(cmd & RTC_TDM) ? "disabled" : "enabled",
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(cmd & RTC_WAM) ? "disabled" : "enabled",
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|
(cmd & RTC_PU_LVL) ? "pulse" : "level",
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(cmd & RTC_IBH_LO) ? "low" : "high",
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(cmd & RTC_IPSW) ? "unswapped" : "swapped");
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return p - buf;
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}
|
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|
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|
static int ds1286_read_proc(char *page, char **start, off_t off,
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int count, int *eof, void *data)
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|
{
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int len = ds1286_proc_output (page);
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if (len <= off+count) *eof = 1;
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*start = page + off;
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len -= off;
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if (len>count)
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|
len = count;
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|
if (len<0)
|
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|
len = 0;
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||
|
|
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return len;
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|
}
|
||
|
|
||
|
/*
|
||
|
* Returns true if a clock update is in progress
|
||
|
*/
|
||
|
static inline unsigned char ds1286_is_updating(void)
|
||
|
{
|
||
|
return rtc_read(RTC_CMD) & RTC_TE;
|
||
|
}
|
||
|
|
||
|
|
||
|
static void ds1286_get_time(struct rtc_time *rtc_tm)
|
||
|
{
|
||
|
unsigned char save_control;
|
||
|
unsigned int flags;
|
||
|
unsigned long uip_watchdog = jiffies;
|
||
|
|
||
|
/*
|
||
|
* read RTC once any update in progress is done. The update
|
||
|
* can take just over 2ms. We wait 10 to 20ms. There is no need to
|
||
|
* to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP.
|
||
|
* If you need to know *exactly* when a second has started, enable
|
||
|
* periodic update complete interrupts, (via ioctl) and then
|
||
|
* immediately read /dev/rtc which will block until you get the IRQ.
|
||
|
* Once the read clears, read the RTC time (again via ioctl). Easy.
|
||
|
*/
|
||
|
|
||
|
if (ds1286_is_updating() != 0)
|
||
|
while (jiffies - uip_watchdog < 2*HZ/100)
|
||
|
barrier();
|
||
|
|
||
|
/*
|
||
|
* Only the values that we read from the RTC are set. We leave
|
||
|
* tm_wday, tm_yday and tm_isdst untouched. Even though the
|
||
|
* RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated
|
||
|
* by the RTC when initially set to a non-zero value.
|
||
|
*/
|
||
|
spin_lock_irqsave(&ds1286_lock, flags);
|
||
|
save_control = rtc_read(RTC_CMD);
|
||
|
rtc_write((save_control|RTC_TE), RTC_CMD);
|
||
|
|
||
|
rtc_tm->tm_sec = rtc_read(RTC_SECONDS);
|
||
|
rtc_tm->tm_min = rtc_read(RTC_MINUTES);
|
||
|
rtc_tm->tm_hour = rtc_read(RTC_HOURS) & 0x3f;
|
||
|
rtc_tm->tm_mday = rtc_read(RTC_DATE);
|
||
|
rtc_tm->tm_mon = rtc_read(RTC_MONTH) & 0x1f;
|
||
|
rtc_tm->tm_year = rtc_read(RTC_YEAR);
|
||
|
|
||
|
rtc_write(save_control, RTC_CMD);
|
||
|
spin_unlock_irqrestore(&ds1286_lock, flags);
|
||
|
|
||
|
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);
|
||
|
|
||
|
/*
|
||
|
* Account for differences between how the RTC uses the values
|
||
|
* and how they are defined in a struct rtc_time;
|
||
|
*/
|
||
|
if (rtc_tm->tm_year < 45)
|
||
|
rtc_tm->tm_year += 30;
|
||
|
if ((rtc_tm->tm_year += 40) < 70)
|
||
|
rtc_tm->tm_year += 100;
|
||
|
|
||
|
rtc_tm->tm_mon--;
|
||
|
}
|
||
|
|
||
|
static int ds1286_set_time(struct rtc_time *rtc_tm)
|
||
|
{
|
||
|
unsigned char mon, day, hrs, min, sec, leap_yr;
|
||
|
unsigned char save_control;
|
||
|
unsigned int yrs, flags;
|
||
|
|
||
|
|
||
|
yrs = rtc_tm->tm_year + 1900;
|
||
|
mon = rtc_tm->tm_mon + 1; /* tm_mon starts at zero */
|
||
|
day = rtc_tm->tm_mday;
|
||
|
hrs = rtc_tm->tm_hour;
|
||
|
min = rtc_tm->tm_min;
|
||
|
sec = rtc_tm->tm_sec;
|
||
|
|
||
|
if (yrs < 1970)
|
||
|
return -EINVAL;
|
||
|
|
||
|
leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400));
|
||
|
|
||
|
if ((mon > 12) || (day == 0))
|
||
|
return -EINVAL;
|
||
|
|
||
|
if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr)))
|
||
|
return -EINVAL;
|
||
|
|
||
|
if ((hrs >= 24) || (min >= 60) || (sec >= 60))
|
||
|
return -EINVAL;
|
||
|
|
||
|
if ((yrs -= 1940) > 255) /* They are unsigned */
|
||
|
return -EINVAL;
|
||
|
|
||
|
if (yrs >= 100)
|
||
|
yrs -= 100;
|
||
|
|
||
|
BIN_TO_BCD(sec);
|
||
|
BIN_TO_BCD(min);
|
||
|
BIN_TO_BCD(hrs);
|
||
|
BIN_TO_BCD(day);
|
||
|
BIN_TO_BCD(mon);
|
||
|
BIN_TO_BCD(yrs);
|
||
|
|
||
|
spin_lock_irqsave(&ds1286_lock, flags);
|
||
|
save_control = rtc_read(RTC_CMD);
|
||
|
rtc_write((save_control|RTC_TE), RTC_CMD);
|
||
|
|
||
|
rtc_write(yrs, RTC_YEAR);
|
||
|
rtc_write(mon, RTC_MONTH);
|
||
|
rtc_write(day, RTC_DATE);
|
||
|
rtc_write(hrs, RTC_HOURS);
|
||
|
rtc_write(min, RTC_MINUTES);
|
||
|
rtc_write(sec, RTC_SECONDS);
|
||
|
rtc_write(0, RTC_HUNDREDTH_SECOND);
|
||
|
|
||
|
rtc_write(save_control, RTC_CMD);
|
||
|
spin_unlock_irqrestore(&ds1286_lock, flags);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static void ds1286_get_alm_time(struct rtc_time *alm_tm)
|
||
|
{
|
||
|
unsigned char cmd;
|
||
|
unsigned int flags;
|
||
|
|
||
|
/*
|
||
|
* Only the values that we read from the RTC are set. That
|
||
|
* means only tm_wday, tm_hour, tm_min.
|
||
|
*/
|
||
|
spin_lock_irqsave(&ds1286_lock, flags);
|
||
|
alm_tm->tm_min = rtc_read(RTC_MINUTES_ALARM) & 0x7f;
|
||
|
alm_tm->tm_hour = rtc_read(RTC_HOURS_ALARM) & 0x1f;
|
||
|
alm_tm->tm_wday = rtc_read(RTC_DAY_ALARM) & 0x07;
|
||
|
cmd = rtc_read(RTC_CMD);
|
||
|
spin_unlock_irqrestore(&ds1286_lock, flags);
|
||
|
|
||
|
BCD_TO_BIN(alm_tm->tm_min);
|
||
|
BCD_TO_BIN(alm_tm->tm_hour);
|
||
|
alm_tm->tm_sec = 0;
|
||
|
}
|
||
|
|
||
|
module_init(ds1286_init);
|
||
|
module_exit(ds1286_exit);
|
||
|
|
||
|
MODULE_AUTHOR("Ralf Baechle");
|
||
|
MODULE_LICENSE("GPL");
|
||
|
MODULE_ALIAS_MISCDEV(RTC_MINOR);
|