Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 578 insertions, 0 deletions

diff --git a/drivers/char/ds1286.c b/drivers/char/ds1286.c
new file mode 100644
index 000000000000..d755cac14bc1
--- /dev/null
+++ b/drivers/char/ds1286.c
@@ -0,0 +1,578 @@
+/*
+ * DS1286 Real Time Clock interface for Linux
+ *
+ * Copyright (C) 1998, 1999, 2000 Ralf Baechle
+ *
+ * Based on code written by Paul Gortmaker.
+ *
+ * This driver allows use of the real time clock (built into nearly all
+ * computers) from user space. It exports the /dev/rtc interface supporting
+ * various ioctl() and also the /proc/rtc pseudo-file for status
+ * information.
+ *
+ * The ioctls can be used to set the interrupt behaviour and generation rate
+ * from the RTC via IRQ 8. Then the /dev/rtc interface can be used to make
+ * use of these timer interrupts, be they interval or alarm based.
+ *
+ * The /dev/rtc interface will block on reads until an interrupt has been
+ * received. If a RTC interrupt has already happened, it will output an
+ * unsigned long and then block. The output value contains the interrupt
+ * status in the low byte and the number of interrupts since the last read
+ * in the remaining high bytes. The /dev/rtc interface can also be used with
+ * the select(2) call.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+#include <linux/ds1286.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/miscdevice.h>
+#include <linux/slab.h>
+#include <linux/ioport.h>
+#include <linux/fcntl.h>
+#include <linux/init.h>
+#include <linux/poll.h>
+#include <linux/rtc.h>
+#include <linux/spinlock.h>
+#include <linux/bcd.h>
+#include <linux/proc_fs.h>
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+#define DS1286_VERSION          "1.0"
+
+/*
+ *      We sponge a minor off of the misc major. No need slurping
+ *      up another valuable major dev number for this. If you add
+ *      an ioctl, make sure you don't conflict with SPARC's RTC
+ *      ioctls.
+ */
+
+static DECLARE_WAIT_QUEUE_HEAD(ds1286_wait);
+
+static ssize_t ds1286_read(struct file *file, char *buf,
+                        size_t count, loff_t *ppos);
+
+static int ds1286_ioctl(struct inode *inode, struct file *file,
+                        unsigned int cmd, unsigned long arg);
+
+static unsigned int ds1286_poll(struct file *file, poll_table *wait);
+
+static void ds1286_get_alm_time (struct rtc_time *alm_tm);
+static void ds1286_get_time(struct rtc_time *rtc_tm);
+static int ds1286_set_time(struct rtc_time *rtc_tm);
+
+static inline unsigned char ds1286_is_updating(void);
+
+static DEFINE_SPINLOCK(ds1286_lock);
+
+static int ds1286_read_proc(char *page, char **start, off_t off,
+                            int count, int *eof, void *data);
+
+/*
+ *      Bits in rtc_status. (7 bits of room for future expansion)
+ */
+
+#define RTC_IS_OPEN             0x01    /* means /dev/rtc is in use     */
+#define RTC_TIMER_ON            0x02    /* missed irq timer active      */
+
+static unsigned char ds1286_status;     /* bitmapped status byte.       */
+
+static unsigned char days_in_mo[] = {
+        0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
+};
+
+/*
+ *      Now all the various file operations that we export.
+ */
+
+static ssize_t ds1286_read(struct file *file, char *buf,
+                           size_t count, loff_t *ppos)
+{
+        return -EIO;
+}
+
+static int ds1286_ioctl(struct inode *inode, struct file *file,
+                        unsigned int cmd, unsigned long arg)
+{
+        struct rtc_time wtime;
+
+        switch (cmd) {
+        case RTC_AIE_OFF:       /* Mask alarm int. enab. bit    */
+        {
+                unsigned int flags;
+                unsigned char val;
+
+                if (!capable(CAP_SYS_TIME))
+                        return -EACCES;
+
+                spin_lock_irqsave(&ds1286_lock, flags);
+                val = rtc_read(RTC_CMD);
+                val |=  RTC_TDM;
+                rtc_write(val, RTC_CMD);
+                spin_unlock_irqrestore(&ds1286_lock, flags);
+
+                return 0;
+        }
+        case RTC_AIE_ON:        /* Allow alarm interrupts.      */
+        {
+                unsigned int flags;
+                unsigned char val;
+
+                if (!capable(CAP_SYS_TIME))
+                        return -EACCES;
+
+                spin_lock_irqsave(&ds1286_lock, flags);
+                val = rtc_read(RTC_CMD);
+                val &=  ~RTC_TDM;
+                rtc_write(val, RTC_CMD);
+                spin_unlock_irqrestore(&ds1286_lock, flags);
+
+                return 0;
+        }
+        case RTC_WIE_OFF:       /* Mask watchdog int. enab. bit */
+        {
+                unsigned int flags;
+                unsigned char val;
+
+                if (!capable(CAP_SYS_TIME))
+                        return -EACCES;
+
+                spin_lock_irqsave(&ds1286_lock, flags);
+                val = rtc_read(RTC_CMD);
+                val |= RTC_WAM;
+                rtc_write(val, RTC_CMD);
+                spin_unlock_irqrestore(&ds1286_lock, flags);
+
+                return 0;
+        }
+        case RTC_WIE_ON:        /* Allow watchdog interrupts.   */
+        {
+                unsigned int flags;
+                unsigned char val;
+
+                if (!capable(CAP_SYS_TIME))
+                        return -EACCES;
+
+                spin_lock_irqsave(&ds1286_lock, flags);
+                val = rtc_read(RTC_CMD);
+                val &= ~RTC_WAM;
+                rtc_write(val, RTC_CMD);
+                spin_unlock_irqrestore(&ds1286_lock, flags);
+
+                return 0;
+        }
+        case RTC_ALM_READ:      /* Read the present alarm time */
+        {
+                /*
+                 * This returns a struct rtc_time. Reading >= 0xc0
+                 * means "don't care" or "match all". Only the tm_hour,
+                 * tm_min, and tm_sec values are filled in.
+                 */
+
+                memset(&wtime, 0, sizeof(wtime));
+                ds1286_get_alm_time(&wtime);
+                break;
+        }
+        case RTC_ALM_SET:       /* Store a time into the alarm */
+        {
+                /*
+                 * This expects a struct rtc_time. Writing 0xff means
+                 * "don't care" or "match all". Only the tm_hour,
+                 * tm_min and tm_sec are used.
+                 */
+                unsigned char hrs, min, sec;
+                struct rtc_time alm_tm;
+
+                if (!capable(CAP_SYS_TIME))
+                        return -EACCES;
+
+                if (copy_from_user(&alm_tm, (struct rtc_time*)arg,
+                                   sizeof(struct rtc_time)))
+                        return -EFAULT;
+
+                hrs = alm_tm.tm_hour;
+                min = alm_tm.tm_min;
+
+                if (hrs >= 24)
+                        hrs = 0xff;
+
+                if (min >= 60)
+                        min = 0xff;
+
+                BIN_TO_BCD(sec);
+                BIN_TO_BCD(min);
+                BIN_TO_BCD(hrs);
+
+                spin_lock(&ds1286_lock);
+                rtc_write(hrs, RTC_HOURS_ALARM);
+                rtc_write(min, RTC_MINUTES_ALARM);
+                spin_unlock(&ds1286_lock);
+
+                return 0;
+        }
+        case RTC_RD_TIME:       /* Read the time/date from RTC  */
+        {
+                memset(&wtime, 0, sizeof(wtime));
+                ds1286_get_time(&wtime);
+                break;
+        }
+        case RTC_SET_TIME:      /* Set the RTC */
+        {
+                struct rtc_time rtc_tm;
+
+                if (!capable(CAP_SYS_TIME))
+                        return -EACCES;
+
+                if (copy_from_user(&rtc_tm, (struct rtc_time*)arg,
+                                   sizeof(struct rtc_time)))
+                        return -EFAULT;
+
+                return ds1286_set_time(&rtc_tm);
+        }
+        default:
+                return -EINVAL;
+        }
+        return copy_to_user((void *)arg, &wtime, sizeof wtime) ? -EFAULT : 0;
+}
+
+/*
+ *      We enforce only one user at a time here with the open/close.
+ *      Also clear the previous interrupt data on an open, and clean
+ *      up things on a close.
+ */
+
+static int ds1286_open(struct inode *inode, struct file *file)
+{
+        spin_lock_irq(&ds1286_lock);
+
+        if (ds1286_status & RTC_IS_OPEN)
+                goto out_busy;
+
+        ds1286_status |= RTC_IS_OPEN;
+
+        spin_unlock_irq(&ds1286_lock);
+        return 0;
+
+out_busy:
+        spin_lock_irq(&ds1286_lock);
+        return -EBUSY;
+}
+
+static int ds1286_release(struct inode *inode, struct file *file)
+{
+        ds1286_status &= ~RTC_IS_OPEN;
+
+        return 0;
+}
+
+static unsigned int ds1286_poll(struct file *file, poll_table *wait)
+{
+        poll_wait(file, &ds1286_wait, wait);
+
+        return 0;
+}
+
+/*
+ *      The various file operations we support.
+ */
+
+static struct file_operations ds1286_fops = {
+        .llseek         = no_llseek,
+        .read           = ds1286_read,
+        .poll           = ds1286_poll,
+        .ioctl          = ds1286_ioctl,
+        .open           = ds1286_open,
+        .release        = ds1286_release,
+};
+
+static struct miscdevice ds1286_dev=
+{
+        .minor  = RTC_MINOR,
+        .name   = "rtc",
+        .fops   = &ds1286_fops,
+};
+
+static int __init ds1286_init(void)
+{
+        int err;
+
+        printk(KERN_INFO "DS1286 Real Time Clock Driver v%s\n", DS1286_VERSION);
+
+        err = misc_register(&ds1286_dev);
+        if (err)
+                goto out;
+
+        if (!create_proc_read_entry("driver/rtc", 0, 0, ds1286_read_proc, NULL)) {
+                err = -ENOMEM;
+
+                goto out_deregister;
+        }
+
+        return 0;
+
+out_deregister:
+        misc_deregister(&ds1286_dev);
+
+out:
+        return err;
+}
+
+static void __exit ds1286_exit(void)
+{
+        remove_proc_entry("driver/rtc", NULL);
+        misc_deregister(&ds1286_dev);
+}
+
+static char *days[] = {
+        "***", "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
+};
+
+/*
+ *      Info exported via "/proc/rtc".
+ */
+static int ds1286_proc_output(char *buf)
+{
+        char *p, *s;
+        struct rtc_time tm;
+        unsigned char hundredth, month, cmd, amode;
+
+        p = buf;
+
+        ds1286_get_time(&tm);
+        hundredth = rtc_read(RTC_HUNDREDTH_SECOND);
+        BCD_TO_BIN(hundredth);
+
+        p += sprintf(p,
+                     "rtc_time\t: %02d:%02d:%02d.%02d\n"
+                     "rtc_date\t: %04d-%02d-%02d\n",
+                     tm.tm_hour, tm.tm_min, tm.tm_sec, hundredth,
+                     tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
+
+        /*
+         * We implicitly assume 24hr mode here. Alarm values >= 0xc0 will
+         * match any value for that particular field. Values that are
+         * greater than a valid time, but less than 0xc0 shouldn't appear.
+         */
+        ds1286_get_alm_time(&tm);
+        p += sprintf(p, "alarm\t\t: %s ", days[tm.tm_wday]);
+        if (tm.tm_hour <= 24)
+                p += sprintf(p, "%02d:", tm.tm_hour);
+        else
+                p += sprintf(p, "**:");
+
+        if (tm.tm_min <= 59)
+                p += sprintf(p, "%02d\n", tm.tm_min);
+        else
+                p += sprintf(p, "**\n");
+
+        month = rtc_read(RTC_MONTH);
+        p += sprintf(p,
+                     "oscillator\t: %s\n"
+                     "square_wave\t: %s\n",
+                     (month & RTC_EOSC) ? "disabled" : "enabled",
+                     (month & RTC_ESQW) ? "disabled" : "enabled");
+
+        amode = ((rtc_read(RTC_MINUTES_ALARM) & 0x80) >> 5) |
+                ((rtc_read(RTC_HOURS_ALARM) & 0x80) >> 6) |
+                ((rtc_read(RTC_DAY_ALARM) & 0x80) >> 7);
+        if (amode == 7)      s = "each minute";
+        else if (amode == 3) s = "minutes match";
+        else if (amode == 1) s = "hours and minutes match";
+        else if (amode == 0) s = "days, hours and minutes match";
+        else                 s = "invalid";
+        p += sprintf(p, "alarm_mode\t: %s\n", s);
+
+        cmd = rtc_read(RTC_CMD);
+        p += sprintf(p,
+                     "alarm_enable\t: %s\n"
+                     "wdog_alarm\t: %s\n"
+                     "alarm_mask\t: %s\n"
+                     "wdog_alarm_mask\t: %s\n"
+                     "interrupt_mode\t: %s\n"
+                     "INTB_mode\t: %s_active\n"
+                     "interrupt_pins\t: %s\n",
+                     (cmd & RTC_TDF) ? "yes" : "no",
+                     (cmd & RTC_WAF) ? "yes" : "no",
+                     (cmd & RTC_TDM) ? "disabled" : "enabled",
+                     (cmd & RTC_WAM) ? "disabled" : "enabled",
+                     (cmd & RTC_PU_LVL) ? "pulse" : "level",
+                     (cmd & RTC_IBH_LO) ? "low" : "high",
+                     (cmd & RTC_IPSW) ? "unswapped" : "swapped");
+
+        return  p - buf;
+}
+
+static int ds1286_read_proc(char *page, char **start, off_t off,
+                         int count, int *eof, void *data)
+{
+        int len = ds1286_proc_output (page);
+        if (len <= off+count) *eof = 1;
+        *start = page + off;
+        len -= off;
+        if (len>count)
+                len = count;
+        if (len<0)
+                len = 0;
+
+        return len;
+}
+
+/*
+ * 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);