3  * Generic HDLC support routines for Linux
8  *	* raw IP-in-HDLC
9  *	* Cisco HDLC
25 #include <linux/hdlc.h>
40 static const char* version = "HDLC support module revision 1.22";
49 	struct hdlc_device *hdlc;  in hdlc_rcv()  local
51 	/* First make sure "dev" is an HDLC device */  in hdlc_rcv()
57 	hdlc = dev_to_hdlc(dev);  in hdlc_rcv()
64 	BUG_ON(!hdlc->proto->netif_rx);  in hdlc_rcv()
65 	return hdlc->proto->netif_rx(skb);  in hdlc_rcv()
70 	hdlc_device *hdlc = dev_to_hdlc(dev);  in hdlc_start_xmit()  local
72 	if (hdlc->proto->xmit)  in hdlc_start_xmit()
73 		return hdlc->proto->xmit(skb, dev);  in hdlc_start_xmit()
75 	return hdlc->xmit(skb, dev); /* call hardware driver directly */  in hdlc_start_xmit()
80 	hdlc_device *hdlc = dev_to_hdlc(dev);  in hdlc_proto_start()  local
81 	if (hdlc->proto->start)  in hdlc_proto_start()
82 		hdlc->proto->start(dev);  in hdlc_proto_start()
89 	hdlc_device *hdlc = dev_to_hdlc(dev);  in hdlc_proto_stop()  local
90 	if (hdlc->proto->stop)  in hdlc_proto_stop()
91 		hdlc->proto->stop(dev);  in hdlc_proto_stop()
100 	hdlc_device *hdlc;  in hdlc_device_event()  local
108 		return NOTIFY_DONE; /* not an HDLC device */  in hdlc_device_event()
120 	hdlc = dev_to_hdlc(dev);  in hdlc_device_event()
121 	spin_lock_irqsave(&hdlc->state_lock, flags);  in hdlc_device_event()
123 	if (hdlc->carrier == on)  in hdlc_device_event()
126 	hdlc->carrier = on;  in hdlc_device_event()
128 	if (!hdlc->open)  in hdlc_device_event()
131 	if (hdlc->carrier) {  in hdlc_device_event()
140 	spin_unlock_irqrestore(&hdlc->state_lock, flags);  in hdlc_device_event()
146 /* Must be called by hardware driver when HDLC device is being opened */
149 	hdlc_device *hdlc = dev_to_hdlc(dev);  in hdlc_open()  local
152 	       hdlc->carrier, hdlc->open);  in hdlc_open()
155 	if (hdlc->proto == NULL)  in hdlc_open()
158 	if (hdlc->proto->open) {  in hdlc_open()
159 		int result = hdlc->proto->open(dev);  in hdlc_open()
164 	spin_lock_irq(&hdlc->state_lock);  in hdlc_open()
166 	if (hdlc->carrier) {  in hdlc_open()
172 	hdlc->open = 1;  in hdlc_open()
174 	spin_unlock_irq(&hdlc->state_lock);  in hdlc_open()
180 /* Must be called by hardware driver when HDLC device is being closed */
183 	hdlc_device *hdlc = dev_to_hdlc(dev);  in hdlc_close()  local
186 	       hdlc->carrier, hdlc->open);  in hdlc_close()
189 	spin_lock_irq(&hdlc->state_lock);  in hdlc_close()
191 	hdlc->open = 0;  in hdlc_close()
192 	if (hdlc->carrier)  in hdlc_close()
195 	spin_unlock_irq(&hdlc->state_lock);  in hdlc_close()
197 	if (hdlc->proto->close)  in hdlc_close()
198 		hdlc->proto->close(dev);  in hdlc_close()
231 	/* Re-init all variables changed by HDLC protocol drivers,  in hdlc_setup_dev()
248 	hdlc_device *hdlc = dev_to_hdlc(dev);  in hdlc_setup()  local
251 	hdlc->carrier = 1;  in hdlc_setup()
252 	hdlc->open = 0;  in hdlc_setup()
253 	spin_lock_init(&hdlc->state_lock);  in hdlc_setup()
259 	dev = alloc_netdev(sizeof(struct hdlc_device), "hdlc%d",  in alloc_hdlcdev()
303 	hdlc_device *hdlc = dev_to_hdlc(dev);  in detach_hdlc_protocol()  local
306 	if (hdlc->proto) {  in detach_hdlc_protocol()
314 		if (hdlc->proto->detach)  in detach_hdlc_protocol()
315 			hdlc->proto->detach(dev);  in detach_hdlc_protocol()
316 		module_put(hdlc->proto->module);  in detach_hdlc_protocol()
317 		hdlc->proto = NULL;  in detach_hdlc_protocol()
319 	kfree(hdlc->state);  in detach_hdlc_protocol()
320 	hdlc->state = NULL;  in detach_hdlc_protocol()
353 MODULE_DESCRIPTION("HDLC support module");