15  * A clock source registers using mISDN_register_clock:
16  *	name = text string to name clock source
17  *	priority = value to priorize clock sources (0 = default)
18  *	ctl = callback function to enable/disable clock source
19  *	priv = private pointer of clock source
20  *	return = pointer to clock source structure;
25  * A clock source calls mISDN_clock_update with given samples elapsed, if
29  * A clock source unregisters using mISDN_unregister_clock.
31  * To get current clock, call mISDN_clock_get. The signed short value
32  * counts the number of samples since. Time since last clock event is added.
48 static u16 iclock_count;		/* counter of last clock */
49 static ktime_t iclock_timestamp;	/* time stamp of last clock */
64 	int pri = -128;  in select_iclock()
67 		if (iclock->pri > pri) {  in select_iclock()
68 			pri = iclock->pri;  in select_iclock()
75 		/* last used clock source still exists but changes, disable */  in select_iclock()
77 			printk(KERN_DEBUG "Old clock source '%s' disable.\n",  in select_iclock()
78 			       lastclock->name);  in select_iclock()
79 		lastclock->ctl(lastclock->priv, 0);  in select_iclock()
82 		/* new clock source selected, enable */  in select_iclock()
84 			printk(KERN_DEBUG "New clock source '%s' enable.\n",  in select_iclock()
85 			       bestclock->name);  in select_iclock()
86 		bestclock->ctl(bestclock->priv, 1);  in select_iclock()
89 		/* no clock received yet */  in select_iclock()
96 *mISDN_register_clock(char *name, int pri, clockctl_func_t *ctl, void *priv)  in mISDN_register_clock()  argument
102 		printk(KERN_DEBUG "%s: %s %d\n", __func__, name, pri);  in mISDN_register_clock()
105 		printk(KERN_ERR "%s: No memory for clock entry.\n", __func__);  in mISDN_register_clock()
108 	strncpy(iclock->name, name, sizeof(iclock->name) - 1);  in mISDN_register_clock()
109 	iclock->pri = pri;  in mISDN_register_clock()
110 	iclock->priv = priv;  in mISDN_register_clock()
111 	iclock->ctl = ctl;  in mISDN_register_clock()
113 	list_add_tail(&iclock->list, &iclock_list);  in mISDN_register_clock()
126 		printk(KERN_DEBUG "%s: %s %d\n", __func__, iclock->name,  in mISDN_unregister_clock()
127 		       iclock->pri);  in mISDN_unregister_clock()
132 			       "Current clock source '%s' unregisters.\n",  in mISDN_unregister_clock()
133 			       iclock->name);  in mISDN_unregister_clock()
134 		iclock->ctl(iclock->priv, 0);  in mISDN_unregister_clock()
136 	list_del(&iclock->list);  in mISDN_unregister_clock()
151 		printk(KERN_ERR "%s: '%s' sends us clock updates, but we do "  in mISDN_clock_update()
153 		       iclock->name,  in mISDN_clock_update()
154 		       iclock_current ? iclock_current->name : "nothing");  in mISDN_clock_update()
155 		iclock->ctl(iclock->priv, 0);  in mISDN_clock_update()
168 		/* calc elapsed time by system clock */  in mISDN_clock_update()
181 			printk("Received first clock from source '%s'.\n",  in mISDN_clock_update()
182 			       iclock_current ? iclock_current->name : "nothing");  in mISDN_clock_update()
197 	/* calc elapsed time by system clock */  in mISDN_clock_get()