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diff -ur linux/drivers/char/Makefile linux-2.4.23/drivers/char/Makefile
--- linux/drivers/char/Makefile Thu Jan 15 14:34:08 2004
+++ linux-2.4.23/drivers/char/Makefile Thu Jan 15 14:33:01 2004
@@ -23,7 +23,7 @@
export-objs := busmouse.o console.o keyboard.o sysrq.o \
misc.o pty.o random.o selection.o serial.o \
- sonypi.o tty_io.o tty_ioctl.o generic_serial.o \
+ sonypi.o tty_io.o tty_ioctl.o generic_serial.o rtc.o \
au1000_gpio.o hp_psaux.o nvram.o scx200.o fetchop.o
mod-subdirs := joystick ftape drm drm-4.0 pcmcia
diff -ur linux/drivers/char/rtc.c linux-2.4.23/drivers/char/rtc.c
--- linux/drivers/char/rtc.c Sat Jan 24 12:06:07 2004
+++ linux-2.4.23/drivers/char/rtc.c Fri Jan 16 23:22:39 2004
@@ -142,6 +142,11 @@
static unsigned long rtc_irq_data = 0; /* our output to the world */
static unsigned long rtc_max_user_freq = 64; /* > this, need CAP_SYS_RESOURCE */
+#if RTC_IRQ
+static spinlock_t rtc_task_lock = SPIN_LOCK_UNLOCKED;
+static rtc_task_t *rtc_callback = NULL;
+#endif
+
/*
* If this driver ever becomes modularised, it will be really nice
* to make the epoch retain its value across module reload...
@@ -183,6 +188,10 @@
spin_unlock (&rtc_lock);
/* Now do the rest of the actions */
+ spin_lock(&rtc_task_lock);
+ if (rtc_callback)
+ rtc_callback->func(rtc_callback->private_data);
+ spin_unlock(&rtc_task_lock);
wake_up_interruptible(&rtc_wait);
kill_fasync (&rtc_async_queue, SIGIO, POLL_IN);
@@ -279,8 +288,7 @@
#endif
}
-static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
- unsigned long arg)
+static int rtc_do_ioctl(unsigned int cmd, unsigned long arg, int kernel)
{
struct rtc_time wtime;
@@ -330,7 +338,7 @@
* We don't really want Joe User enabling more
* than 64Hz of interrupts on a multi-user machine.
*/
- if ((rtc_freq > rtc_max_user_freq) &&
+ if (!kernel && (rtc_freq > rtc_max_user_freq) &&
(!capable(CAP_SYS_RESOURCE)))
return -EACCES;
@@ -526,7 +534,8 @@
* We don't really want Joe User generating more
* than 64Hz of interrupts on a multi-user machine.
*/
- if ((arg > rtc_max_user_freq) && (!capable(CAP_SYS_RESOURCE)))
+ if (!kernel && (arg > rtc_max_user_freq) &&
+ (!capable(CAP_SYS_RESOURCE)))
return -EACCES;
while (arg > (1<<tmp))
@@ -572,6 +581,12 @@
return copy_to_user((void *)arg, &wtime, sizeof wtime) ? -EFAULT : 0;
}
+static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ return rtc_do_ioctl(cmd, arg, 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
@@ -639,11 +654,8 @@
spin_lock_irq (&rtc_lock);
rtc_irq_data = 0;
- spin_unlock_irq (&rtc_lock);
-
- /* No need for locking -- nobody else can do anything until this rmw is
- * committed, and no timer is running. */
rtc_status &= ~RTC_IS_OPEN;
+ spin_unlock_irq (&rtc_lock);
return 0;
}
@@ -669,6 +681,88 @@
#endif
/*
+ * exported stuff
+ */
+
+EXPORT_SYMBOL(rtc_register);
+EXPORT_SYMBOL(rtc_unregister);
+EXPORT_SYMBOL(rtc_control);
+
+int rtc_register(rtc_task_t *task)
+{
+#if !RTC_IRQ
+ return -EIO;
+#else
+ if (task == NULL || task->func == NULL)
+ return -EINVAL;
+ spin_lock_irq(&rtc_lock);
+ if (rtc_status & RTC_IS_OPEN) {
+ spin_unlock_irq(&rtc_lock);
+ return -EBUSY;
+ }
+ spin_lock(&rtc_task_lock);
+ if (rtc_callback) {
+ spin_unlock(&rtc_task_lock);
+ spin_unlock_irq(&rtc_lock);
+ return -EBUSY;
+ }
+ rtc_status |= RTC_IS_OPEN;
+ rtc_callback = task;
+ spin_unlock(&rtc_task_lock);
+ spin_unlock_irq(&rtc_lock);
+ return 0;
+#endif
+}
+
+int rtc_unregister(rtc_task_t *task)
+{
+#if !RTC_IRQ
+ return -EIO;
+#else
+ unsigned char tmp;
+
+ spin_lock_irq(&rtc_task_lock);
+ if (rtc_callback != task) {
+ spin_unlock_irq(&rtc_task_lock);
+ return -ENXIO;
+ }
+ rtc_callback = NULL;
+ spin_lock(&rtc_lock);
+ /* disable controls */
+ tmp = CMOS_READ(RTC_CONTROL);
+ tmp &= ~RTC_PIE;
+ tmp &= ~RTC_AIE;
+ tmp &= ~RTC_UIE;
+ CMOS_WRITE(tmp, RTC_CONTROL);
+ CMOS_READ(RTC_INTR_FLAGS);
+ if (rtc_status & RTC_TIMER_ON) {
+ rtc_status &= ~RTC_TIMER_ON;
+ del_timer(&rtc_irq_timer);
+ }
+ rtc_status &= ~RTC_IS_OPEN;
+ spin_unlock(&rtc_lock);
+ spin_unlock_irq(&rtc_task_lock);
+ return 0;
+#endif
+}
+
+int rtc_control(rtc_task_t *task, unsigned int cmd, unsigned long arg)
+{
+#if !RTC_IRQ
+ return -EIO;
+#else
+ spin_lock_irq(&rtc_task_lock);
+ if (rtc_callback != task) {
+ spin_unlock_irq(&rtc_task_lock);
+ return -ENXIO;
+ }
+ spin_unlock_irq(&rtc_task_lock);
+ return rtc_do_ioctl(cmd, arg, 1);
+#endif
+}
+
+
+/*
* The various file operations we support.
*/
@@ -858,7 +952,6 @@
module_init(rtc_init);
module_exit(rtc_exit);
-EXPORT_NO_SYMBOLS;
#if RTC_IRQ
/*
diff -ur linux/include/linux/rtc.h linux-2.4.23/include/linux/rtc.h
--- linux/include/linux/rtc.h Thu Jan 15 14:40:40 2004
+++ linux-2.4.23/include/linux/rtc.h Fri Jan 16 23:22:19 2004
@@ -90,4 +90,18 @@
#define RTC_PLL_GET _IOR('p', 0x11, struct rtc_pll_info) /* Get PLL correction */
#define RTC_PLL_SET _IOW('p', 0x12, struct rtc_pll_info) /* Set PLL correction */
+
+/* Exported functions to other kernel drivers */
+
+#ifdef __KERNEL__
+typedef struct rtc_task {
+ void (*func)(void *private_data);
+ void *private_data;
+} rtc_task_t;
+
+int rtc_register(rtc_task_t *task);
+int rtc_unregister(rtc_task_t *task);
+int rtc_control(rtc_task_t *task, unsigned int cmd, unsigned long arg);
+#endif
+
#endif /* _LINUX_RTC_H_ */
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