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, 417 insertions, 0 deletions

diff --git a/drivers/char/efirtc.c b/drivers/char/efirtc.c
new file mode 100644
index 000000000000..0090e7a4fcd3
--- /dev/null
+++ b/drivers/char/efirtc.c
@@ -0,0 +1,417 @@
+/*
+ * EFI Time Services Driver for Linux
+ *
+ * Copyright (C) 1999 Hewlett-Packard Co
+ * Copyright (C) 1999 Stephane Eranian <eranian@hpl.hp.com>
+ *
+ * Based on skeleton from the drivers/char/rtc.c driver by P. Gortmaker
+ *
+ * This code provides an architected & portable interface to the real time
+ * clock by using EFI instead of direct bit fiddling. The functionalities are 
+ * quite different from the rtc.c driver. The only way to talk to the device 
+ * is by using ioctl(). There is a /proc interface which provides the raw 
+ * information.
+ *
+ * Please note that we have kept the API as close as possible to the
+ * legacy RTC. The standard /sbin/hwclock program should work normally 
+ * when used to get/set the time.
+ *
+ * NOTES:
+ *      - Locking is required for safe execution of EFI calls with regards
+ *        to interrrupts and SMP.
+ *
+ * TODO (December 1999):
+ *      - provide the API to set/get the WakeUp Alarm (different from the
+ *        rtc.c alarm).
+ *      - SMP testing
+ *      - Add module support
+ */
+
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/rtc.h>
+#include <linux/proc_fs.h>
+#include <linux/efi.h>
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+#define EFI_RTC_VERSION         "0.4"
+
+#define EFI_ISDST (EFI_TIME_ADJUST_DAYLIGHT|EFI_TIME_IN_DAYLIGHT)
+/*
+ * EFI Epoch is 1/1/1998
+ */
+#define EFI_RTC_EPOCH           1998
+
+static DEFINE_SPINLOCK(efi_rtc_lock);
+
+static int efi_rtc_ioctl(struct inode *inode, struct file *file,
+                     unsigned int cmd, unsigned long arg);
+
+#define is_leap(year) \
+          ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
+
+static const unsigned short int __mon_yday[2][13] =
+{
+        /* Normal years.  */
+        { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
+        /* Leap years.  */  
+        { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
+};
+
+/*
+ * returns day of the year [0-365]
+ */
+static inline int
+compute_yday(efi_time_t *eft)
+{
+        /* efi_time_t.month is in the [1-12] so, we need -1 */
+        return  __mon_yday[is_leap(eft->year)][eft->month-1]+ eft->day -1;
+}
+/*
+ * returns day of the week [0-6] 0=Sunday
+ *
+ * Don't try to provide a year that's before 1998, please !
+ */
+static int
+compute_wday(efi_time_t *eft)
+{
+        int y;
+        int ndays = 0;
+
+        if ( eft->year < 1998 ) {
+                printk(KERN_ERR "efirtc: EFI year < 1998, invalid date\n");
+                return -1;
+        }
+
+        for(y=EFI_RTC_EPOCH; y < eft->year; y++ ) {
+                ndays += 365 + (is_leap(y) ? 1 : 0);
+        }
+        ndays += compute_yday(eft);
+
+        /*
+         * 4=1/1/1998 was a Thursday
+         */
+        return (ndays + 4) % 7;
+}
+
+static void
+convert_to_efi_time(struct rtc_time *wtime, efi_time_t *eft)
+{
+
+        eft->year       = wtime->tm_year + 1900;
+        eft->month      = wtime->tm_mon + 1; 
+        eft->day        = wtime->tm_mday;
+        eft->hour       = wtime->tm_hour;
+        eft->minute     = wtime->tm_min;
+        eft->second     = wtime->tm_sec;
+        eft->nanosecond = 0; 
+        eft->daylight   = wtime->tm_isdst ? EFI_ISDST: 0;
+        eft->timezone   = EFI_UNSPECIFIED_TIMEZONE;
+}
+
+static void
+convert_from_efi_time(efi_time_t *eft, struct rtc_time *wtime)
+{
+        memset(wtime, 0, sizeof(*wtime));
+        wtime->tm_sec  = eft->second;
+        wtime->tm_min  = eft->minute;
+        wtime->tm_hour = eft->hour;
+        wtime->tm_mday = eft->day;
+        wtime->tm_mon  = eft->month - 1;
+        wtime->tm_year = eft->year - 1900;
+
+        /* day of the week [0-6], Sunday=0 */
+        wtime->tm_wday = compute_wday(eft);
+
+        /* day in the year [1-365]*/
+        wtime->tm_yday = compute_yday(eft);
+
+
+        switch (eft->daylight & EFI_ISDST) {
+                case EFI_ISDST:
+                        wtime->tm_isdst = 1;
+                        break;
+                case EFI_TIME_ADJUST_DAYLIGHT:
+                        wtime->tm_isdst = 0;
+                        break;
+                default:
+                        wtime->tm_isdst = -1;
+        }
+}
+
+static int
+efi_rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
+                     unsigned long arg)
+{
+
+        efi_status_t    status;
+        unsigned long   flags;
+        efi_time_t      eft;
+        efi_time_cap_t  cap;
+        struct rtc_time wtime;
+        struct rtc_wkalrm __user *ewp;
+        unsigned char   enabled, pending;
+
+        switch (cmd) {
+                case RTC_UIE_ON:
+                case RTC_UIE_OFF:
+                case RTC_PIE_ON:
+                case RTC_PIE_OFF:
+                case RTC_AIE_ON:
+                case RTC_AIE_OFF:
+                case RTC_ALM_SET:
+                case RTC_ALM_READ:
+                case RTC_IRQP_READ:
+                case RTC_IRQP_SET:
+                case RTC_EPOCH_READ:
+                case RTC_EPOCH_SET:
+                        return -EINVAL;
+
+                case RTC_RD_TIME:
+
+                        spin_lock_irqsave(&efi_rtc_lock, flags);
+
+                        status = efi.get_time(&eft, &cap);
+
+                        spin_unlock_irqrestore(&efi_rtc_lock,flags);
+
+                        if (status != EFI_SUCCESS) {
+                                /* should never happen */
+                                printk(KERN_ERR "efitime: can't read time\n");
+                                return -EINVAL;
+                        }
+
+                        convert_from_efi_time(&eft, &wtime);
+
+                        return copy_to_user((void __user *)arg, &wtime,
+                                            sizeof (struct rtc_time)) ? - EFAULT : 0;
+
+                case RTC_SET_TIME:
+
+                        if (!capable(CAP_SYS_TIME)) return -EACCES;
+
+                        if (copy_from_user(&wtime, (struct rtc_time __user *)arg,
+                                           sizeof(struct rtc_time)) )
+                                return -EFAULT;
+
+                        convert_to_efi_time(&wtime, &eft);
+
+                        spin_lock_irqsave(&efi_rtc_lock, flags);
+
+                        status = efi.set_time(&eft);
+
+                        spin_unlock_irqrestore(&efi_rtc_lock,flags);
+
+                        return status == EFI_SUCCESS ? 0 : -EINVAL;
+
+                case RTC_WKALM_SET:
+
+                        if (!capable(CAP_SYS_TIME)) return -EACCES;
+
+                        ewp = (struct rtc_wkalrm __user *)arg;
+
+                        if (  get_user(enabled, &ewp->enabled)
+                           || copy_from_user(&wtime, &ewp->time, sizeof(struct rtc_time)) )
+                                return -EFAULT;
+
+                        convert_to_efi_time(&wtime, &eft);
+
+                        spin_lock_irqsave(&efi_rtc_lock, flags);
+                        /*
+                         * XXX Fixme:
+                         * As of EFI 0.92 with the firmware I have on my
+                         * machine this call does not seem to work quite
+                         * right
+                         */
+                        status = efi.set_wakeup_time((efi_bool_t)enabled, &eft);
+
+                        spin_unlock_irqrestore(&efi_rtc_lock,flags);
+
+                        return status == EFI_SUCCESS ? 0 : -EINVAL;
+
+                case RTC_WKALM_RD:
+
+                        spin_lock_irqsave(&efi_rtc_lock, flags);
+
+                        status = efi.get_wakeup_time((efi_bool_t *)&enabled, (efi_bool_t *)&pending, &eft);
+
+                        spin_unlock_irqrestore(&efi_rtc_lock,flags);
+
+                        if (status != EFI_SUCCESS) return -EINVAL;
+
+                        ewp = (struct rtc_wkalrm __user *)arg;
+
+                        if (  put_user(enabled, &ewp->enabled)
+                           || put_user(pending, &ewp->pending)) return -EFAULT;
+
+                        convert_from_efi_time(&eft, &wtime);
+
+                        return copy_to_user(&ewp->time, &wtime,
+                                            sizeof(struct rtc_time)) ? -EFAULT : 0;
+        }
+        return -EINVAL;
+}
+
+/*
+ *      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
+efi_rtc_open(struct inode *inode, struct file *file)
+{
+        /*
+         * nothing special to do here
+         * We do accept multiple open files at the same time as we
+         * synchronize on the per call operation.
+         */
+        return 0;
+}
+
+static int
+efi_rtc_close(struct inode *inode, struct file *file)
+{
+        return 0;
+}
+
+/*
+ *      The various file operations we support.
+ */
+
+static struct file_operations efi_rtc_fops = {
+        .owner          = THIS_MODULE,
+        .ioctl          = efi_rtc_ioctl,
+        .open           = efi_rtc_open,
+        .release        = efi_rtc_close,
+};
+
+static struct miscdevice efi_rtc_dev=
+{
+        EFI_RTC_MINOR,
+        "efirtc",
+        &efi_rtc_fops
+};
+
+/*
+ *      We export RAW EFI information to /proc/driver/efirtc
+ */
+static int
+efi_rtc_get_status(char *buf)
+{
+        efi_time_t      eft, alm;
+        efi_time_cap_t  cap;
+        char            *p = buf;
+        efi_bool_t      enabled, pending;       
+        unsigned long   flags;
+
+        memset(&eft, 0, sizeof(eft));
+        memset(&alm, 0, sizeof(alm));
+        memset(&cap, 0, sizeof(cap));
+
+        spin_lock_irqsave(&efi_rtc_lock, flags);
+
+        efi.get_time(&eft, &cap);
+        efi.get_wakeup_time(&enabled, &pending, &alm);
+
+        spin_unlock_irqrestore(&efi_rtc_lock,flags);
+
+        p += sprintf(p,
+                     "Time           : %u:%u:%u.%09u\n"
+                     "Date           : %u-%u-%u\n"
+                     "Daylight       : %u\n",
+                     eft.hour, eft.minute, eft.second, eft.nanosecond, 
+                     eft.year, eft.month, eft.day,
+                     eft.daylight);
+
+        if (eft.timezone == EFI_UNSPECIFIED_TIMEZONE)
+                p += sprintf(p, "Timezone       : unspecified\n");
+        else
+                /* XXX fixme: convert to string? */
+                p += sprintf(p, "Timezone       : %u\n", eft.timezone);
+                
+
+        p += sprintf(p,
+                     "Alarm Time     : %u:%u:%u.%09u\n"
+                     "Alarm Date     : %u-%u-%u\n"
+                     "Alarm Daylight : %u\n"
+                     "Enabled        : %s\n"
+                     "Pending        : %s\n",
+                     alm.hour, alm.minute, alm.second, alm.nanosecond, 
+                     alm.year, alm.month, alm.day, 
+                     alm.daylight,
+                     enabled == 1 ? "yes" : "no",
+                     pending == 1 ? "yes" : "no");
+
+        if (eft.timezone == EFI_UNSPECIFIED_TIMEZONE)
+                p += sprintf(p, "Timezone       : unspecified\n");
+        else
+                /* XXX fixme: convert to string? */
+                p += sprintf(p, "Timezone       : %u\n", alm.timezone);
+
+        /*
+         * now prints the capabilities
+         */
+        p += sprintf(p,
+                     "Resolution     : %u\n"
+                     "Accuracy       : %u\n"
+                     "SetstoZero     : %u\n",
+                      cap.resolution, cap.accuracy, cap.sets_to_zero);
+
+        return  p - buf;
+}
+
+static int
+efi_rtc_read_proc(char *page, char **start, off_t off,
+                                 int count, int *eof, void *data)
+{
+        int len = efi_rtc_get_status(page);
+        if (len <= off+count) *eof = 1;
+        *start = page + off;
+        len -= off;
+        if (len>count) len = count;
+        if (len<0) len = 0;
+        return len;
+}
+
+static int __init 
+efi_rtc_init(void)
+{
+        int ret;
+        struct proc_dir_entry *dir;
+
+        printk(KERN_INFO "EFI Time Services Driver v%s\n", EFI_RTC_VERSION);
+
+        ret = misc_register(&efi_rtc_dev);
+        if (ret) {
+                printk(KERN_ERR "efirtc: can't misc_register on minor=%d\n",
+                                EFI_RTC_MINOR);
+                return ret;
+        }
+
+        dir = create_proc_read_entry ("driver/efirtc", 0, NULL,
+                                      efi_rtc_read_proc, NULL);
+        if (dir == NULL) {
+                printk(KERN_ERR "efirtc: can't create /proc/driver/efirtc.\n");
+                misc_deregister(&efi_rtc_dev);
+                return -1;
+        }
+        return 0;
+}
+
+static void __exit
+efi_rtc_exit(void)
+{
+        /* not yet used */
+}
+
+module_init(efi_rtc_init);
+module_exit(efi_rtc_exit);
+
+MODULE_LICENSE("GPL");