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path: root/ANDROID_3.4.5/drivers/isdn/mISDN/clock.c
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Diffstat (limited to 'ANDROID_3.4.5/drivers/isdn/mISDN/clock.c')
-rw-r--r--ANDROID_3.4.5/drivers/isdn/mISDN/clock.c217
1 files changed, 0 insertions, 217 deletions
diff --git a/ANDROID_3.4.5/drivers/isdn/mISDN/clock.c b/ANDROID_3.4.5/drivers/isdn/mISDN/clock.c
deleted file mode 100644
index 693fb7c9..00000000
--- a/ANDROID_3.4.5/drivers/isdn/mISDN/clock.c
+++ /dev/null
@@ -1,217 +0,0 @@
-/*
- * Copyright 2008 by Andreas Eversberg <andreas@eversberg.eu>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * Quick API description:
- *
- * A clock source registers using mISDN_register_clock:
- * name = text string to name clock source
- * priority = value to priorize clock sources (0 = default)
- * ctl = callback function to enable/disable clock source
- * priv = private pointer of clock source
- * return = pointer to clock source structure;
- *
- * Note: Callback 'ctl' can be called before mISDN_register_clock returns!
- * Also it can be called during mISDN_unregister_clock.
- *
- * A clock source calls mISDN_clock_update with given samples elapsed, if
- * enabled. If function call is delayed, tv must be set with the timestamp
- * of the actual event.
- *
- * A clock source unregisters using mISDN_unregister_clock.
- *
- * To get current clock, call mISDN_clock_get. The signed short value
- * counts the number of samples since. Time since last clock event is added.
- *
- */
-
-#include <linux/slab.h>
-#include <linux/types.h>
-#include <linux/stddef.h>
-#include <linux/spinlock.h>
-#include <linux/mISDNif.h>
-#include <linux/export.h>
-#include "core.h"
-
-static u_int *debug;
-static LIST_HEAD(iclock_list);
-static DEFINE_RWLOCK(iclock_lock);
-static u16 iclock_count; /* counter of last clock */
-static struct timeval iclock_tv; /* time stamp of last clock */
-static int iclock_tv_valid; /* already received one timestamp */
-static struct mISDNclock *iclock_current;
-
-void
-mISDN_init_clock(u_int *dp)
-{
- debug = dp;
- do_gettimeofday(&iclock_tv);
-}
-
-static void
-select_iclock(void)
-{
- struct mISDNclock *iclock, *bestclock = NULL, *lastclock = NULL;
- int pri = -128;
-
- list_for_each_entry(iclock, &iclock_list, list) {
- if (iclock->pri > pri) {
- pri = iclock->pri;
- bestclock = iclock;
- }
- if (iclock_current == iclock)
- lastclock = iclock;
- }
- if (lastclock && bestclock != lastclock) {
- /* last used clock source still exists but changes, disable */
- if (*debug & DEBUG_CLOCK)
- printk(KERN_DEBUG "Old clock source '%s' disable.\n",
- lastclock->name);
- lastclock->ctl(lastclock->priv, 0);
- }
- if (bestclock && bestclock != iclock_current) {
- /* new clock source selected, enable */
- if (*debug & DEBUG_CLOCK)
- printk(KERN_DEBUG "New clock source '%s' enable.\n",
- bestclock->name);
- bestclock->ctl(bestclock->priv, 1);
- }
- if (bestclock != iclock_current) {
- /* no clock received yet */
- iclock_tv_valid = 0;
- }
- iclock_current = bestclock;
-}
-
-struct mISDNclock
-*mISDN_register_clock(char *name, int pri, clockctl_func_t *ctl, void *priv)
-{
- u_long flags;
- struct mISDNclock *iclock;
-
- if (*debug & (DEBUG_CORE | DEBUG_CLOCK))
- printk(KERN_DEBUG "%s: %s %d\n", __func__, name, pri);
- iclock = kzalloc(sizeof(struct mISDNclock), GFP_ATOMIC);
- if (!iclock) {
- printk(KERN_ERR "%s: No memory for clock entry.\n", __func__);
- return NULL;
- }
- strncpy(iclock->name, name, sizeof(iclock->name) - 1);
- iclock->pri = pri;
- iclock->priv = priv;
- iclock->ctl = ctl;
- write_lock_irqsave(&iclock_lock, flags);
- list_add_tail(&iclock->list, &iclock_list);
- select_iclock();
- write_unlock_irqrestore(&iclock_lock, flags);
- return iclock;
-}
-EXPORT_SYMBOL(mISDN_register_clock);
-
-void
-mISDN_unregister_clock(struct mISDNclock *iclock)
-{
- u_long flags;
-
- if (*debug & (DEBUG_CORE | DEBUG_CLOCK))
- printk(KERN_DEBUG "%s: %s %d\n", __func__, iclock->name,
- iclock->pri);
- write_lock_irqsave(&iclock_lock, flags);
- if (iclock_current == iclock) {
- if (*debug & DEBUG_CLOCK)
- printk(KERN_DEBUG
- "Current clock source '%s' unregisters.\n",
- iclock->name);
- iclock->ctl(iclock->priv, 0);
- }
- list_del(&iclock->list);
- select_iclock();
- write_unlock_irqrestore(&iclock_lock, flags);
-}
-EXPORT_SYMBOL(mISDN_unregister_clock);
-
-void
-mISDN_clock_update(struct mISDNclock *iclock, int samples, struct timeval *tv)
-{
- u_long flags;
- struct timeval tv_now;
- time_t elapsed_sec;
- int elapsed_8000th;
-
- write_lock_irqsave(&iclock_lock, flags);
- if (iclock_current != iclock) {
- printk(KERN_ERR "%s: '%s' sends us clock updates, but we do "
- "listen to '%s'. This is a bug!\n", __func__,
- iclock->name,
- iclock_current ? iclock_current->name : "nothing");
- iclock->ctl(iclock->priv, 0);
- write_unlock_irqrestore(&iclock_lock, flags);
- return;
- }
- if (iclock_tv_valid) {
- /* increment sample counter by given samples */
- iclock_count += samples;
- if (tv) { /* tv must be set, if function call is delayed */
- iclock_tv.tv_sec = tv->tv_sec;
- iclock_tv.tv_usec = tv->tv_usec;
- } else
- do_gettimeofday(&iclock_tv);
- } else {
- /* calc elapsed time by system clock */
- if (tv) { /* tv must be set, if function call is delayed */
- tv_now.tv_sec = tv->tv_sec;
- tv_now.tv_usec = tv->tv_usec;
- } else
- do_gettimeofday(&tv_now);
- elapsed_sec = tv_now.tv_sec - iclock_tv.tv_sec;
- elapsed_8000th = (tv_now.tv_usec / 125)
- - (iclock_tv.tv_usec / 125);
- if (elapsed_8000th < 0) {
- elapsed_sec -= 1;
- elapsed_8000th += 8000;
- }
- /* add elapsed time to counter and set new timestamp */
- iclock_count += elapsed_sec * 8000 + elapsed_8000th;
- iclock_tv.tv_sec = tv_now.tv_sec;
- iclock_tv.tv_usec = tv_now.tv_usec;
- iclock_tv_valid = 1;
- if (*debug & DEBUG_CLOCK)
- printk("Received first clock from source '%s'.\n",
- iclock_current ? iclock_current->name : "nothing");
- }
- write_unlock_irqrestore(&iclock_lock, flags);
-}
-EXPORT_SYMBOL(mISDN_clock_update);
-
-unsigned short
-mISDN_clock_get(void)
-{
- u_long flags;
- struct timeval tv_now;
- time_t elapsed_sec;
- int elapsed_8000th;
- u16 count;
-
- read_lock_irqsave(&iclock_lock, flags);
- /* calc elapsed time by system clock */
- do_gettimeofday(&tv_now);
- elapsed_sec = tv_now.tv_sec - iclock_tv.tv_sec;
- elapsed_8000th = (tv_now.tv_usec / 125) - (iclock_tv.tv_usec / 125);
- if (elapsed_8000th < 0) {
- elapsed_sec -= 1;
- elapsed_8000th += 8000;
- }
- /* add elapsed time to counter */
- count = iclock_count + elapsed_sec * 8000 + elapsed_8000th;
- read_unlock_irqrestore(&iclock_lock, flags);
- return count;
-}
-EXPORT_SYMBOL(mISDN_clock_get);
generated by cgit (git 2.34.1) at 2025-03-12 21:34:43 +0000