1 // SPDX-License-Identifier: GPL-2.0-only
3  * phonet.c -- USB CDC Phonet host driver
5  * Copyright (C) 2008-2009 Nokia Corporation. All rights reserved.
7  * Author: Rémi Denis-Courmont
55 	if (skb->protocol != htons(ETH_P_PHONET))  in usbpn_xmit()
61 	usb_fill_bulk_urb(req, pnd->usb, pnd->tx_pipe, skb->data, skb->len,  in usbpn_xmit()
63 	req->transfer_flags = URB_ZERO_PACKET;  in usbpn_xmit()
70 	spin_lock_irqsave(&pnd->tx_lock, flags);  in usbpn_xmit()
71 	pnd->tx_queue++;  in usbpn_xmit()
72 	if (pnd->tx_queue >= dev->tx_queue_len)  in usbpn_xmit()
74 	spin_unlock_irqrestore(&pnd->tx_lock, flags);  in usbpn_xmit()
79 	dev->stats.tx_dropped++;  in usbpn_xmit()
85 	struct sk_buff *skb = req->context;  in tx_complete()
86 	struct net_device *dev = skb->dev;  in tx_complete()
88 	int status = req->status;  in tx_complete()
93 		dev->stats.tx_bytes += skb->len;  in tx_complete()
96 	case -ENOENT:  in tx_complete()
97 	case -ECONNRESET:  in tx_complete()
98 	case -ESHUTDOWN:  in tx_complete()
99 		dev->stats.tx_aborted_errors++;  in tx_complete()
102 		dev->stats.tx_errors++;  in tx_complete()
103 		dev_dbg(&dev->dev, "TX error (%d)\n", status);  in tx_complete()
105 	dev->stats.tx_packets++;  in tx_complete()
107 	spin_lock_irqsave(&pnd->tx_lock, flags);  in tx_complete()
108 	pnd->tx_queue--;  in tx_complete()
110 	spin_unlock_irqrestore(&pnd->tx_lock, flags);  in tx_complete()
118 	struct net_device *dev = pnd->dev;  in rx_submit()
124 		return -ENOMEM;  in rx_submit()
126 	usb_fill_bulk_urb(req, pnd->usb, pnd->rx_pipe, page_address(page),  in rx_submit()
128 	req->transfer_flags = 0;  in rx_submit()
131 		dev_dbg(&dev->dev, "RX submit error (%d)\n", err);  in rx_submit()
139 	struct net_device *dev = req->context;  in rx_complete()
141 	struct page *page = virt_to_page(req->transfer_buffer);  in rx_complete()
144 	int status = req->status;  in rx_complete()
148 		spin_lock_irqsave(&pnd->rx_lock, flags);  in rx_complete()
149 		skb = pnd->rx_skb;  in rx_complete()
151 			skb = pnd->rx_skb = netdev_alloc_skb(dev, 12);  in rx_complete()
155 				skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,  in rx_complete()
156 						page, 1, req->actual_length,  in rx_complete()
161 			skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,  in rx_complete()
162 					page, 0, req->actual_length,  in rx_complete()
166 		if (req->actual_length < PAGE_SIZE)  in rx_complete()
167 			pnd->rx_skb = NULL; /* Last fragment */  in rx_complete()
170 		spin_unlock_irqrestore(&pnd->rx_lock, flags);  in rx_complete()
172 			skb->protocol = htons(ETH_P_PHONET);  in rx_complete()
175 			skb->dev = dev;  in rx_complete()
176 			dev->stats.rx_packets++;  in rx_complete()
177 			dev->stats.rx_bytes += skb->len;  in rx_complete()
183 	case -ENOENT:  in rx_complete()
184 	case -ECONNRESET:  in rx_complete()
185 	case -ESHUTDOWN:  in rx_complete()
189 	case -EOVERFLOW:  in rx_complete()
190 		dev->stats.rx_over_errors++;  in rx_complete()
191 		dev_dbg(&dev->dev, "RX overflow\n");  in rx_complete()
194 	case -EILSEQ:  in rx_complete()
195 		dev->stats.rx_crc_errors++;  in rx_complete()
199 	dev->stats.rx_errors++;  in rx_complete()
214 	unsigned num = pnd->data_intf->cur_altsetting->desc.bInterfaceNumber;  in usbpn_open()
216 	err = usb_set_interface(pnd->usb, num, pnd->active_setting);  in usbpn_open()
226 			return -ENOMEM;  in usbpn_open()
228 		pnd->urbs[i] = req;  in usbpn_open()
239 	unsigned num = pnd->data_intf->cur_altsetting->desc.bInterfaceNumber;  in usbpn_close()
244 		struct urb *req = pnd->urbs[i];  in usbpn_close()
250 		pnd->urbs[i] = NULL;  in usbpn_close()
253 	return usb_set_interface(pnd->usb, num, !pnd->active_setting);  in usbpn_close()
263 		req->ifr_phonet_autoconf.device = PN_DEV_PC;  in usbpn_siocdevprivate()
266 	return -ENOIOCTLCMD;  in usbpn_siocdevprivate()
280 	dev->features		= 0;  in usbpn_setup()
281 	dev->netdev_ops		= &usbpn_ops;  in usbpn_setup()
282 	dev->header_ops		= &phonet_header_ops;  in usbpn_setup()
283 	dev->type		= ARPHRD_PHONET;  in usbpn_setup()
284 	dev->flags		= IFF_POINTOPOINT | IFF_NOARP;  in usbpn_setup()
285 	dev->mtu		= PHONET_MAX_MTU;  in usbpn_setup()
286 	dev->min_mtu		= PHONET_MIN_MTU;  in usbpn_setup()
287 	dev->max_mtu		= PHONET_MAX_MTU;  in usbpn_setup()
288 	dev->hard_header_len	= 1;  in usbpn_setup()
289 	dev->addr_len		= 1;  in usbpn_setup()
291 	dev->tx_queue_len	= 3;  in usbpn_setup()
293 	dev->needs_free_netdev	= true;  in usbpn_setup()
329 	data = intf->altsetting->extra;  in usbpn_probe()
330 	len = intf->altsetting->extralen;  in usbpn_probe()
336 		return -EINVAL;  in usbpn_probe()
338 	data_intf = usb_ifnum_to_if(usbdev, union_header->bSlaveInterface0);  in usbpn_probe()
340 		return -ENODEV;  in usbpn_probe()
341 	/* Data interface has one inactive and one active setting */  in usbpn_probe()
342 	if (data_intf->num_altsetting != 2)  in usbpn_probe()
343 		return -EINVAL;  in usbpn_probe()
344 	if (data_intf->altsetting[0].desc.bNumEndpoints == 0 &&  in usbpn_probe()
345 	    data_intf->altsetting[1].desc.bNumEndpoints == 2)  in usbpn_probe()
346 		data_desc = data_intf->altsetting + 1;  in usbpn_probe()
348 	if (data_intf->altsetting[0].desc.bNumEndpoints == 2 &&  in usbpn_probe()
349 	    data_intf->altsetting[1].desc.bNumEndpoints == 0)  in usbpn_probe()
350 		data_desc = data_intf->altsetting;  in usbpn_probe()
352 		return -EINVAL;  in usbpn_probe()
357 		return -ENOMEM;  in usbpn_probe()
360 	SET_NETDEV_DEV(dev, &intf->dev);  in usbpn_probe()
362 	pnd->dev = dev;  in usbpn_probe()
363 	pnd->usb = usbdev;  in usbpn_probe()
364 	pnd->intf = intf;  in usbpn_probe()
365 	pnd->data_intf = data_intf;  in usbpn_probe()
366 	spin_lock_init(&pnd->tx_lock);  in usbpn_probe()
367 	spin_lock_init(&pnd->rx_lock);  in usbpn_probe()
369 	if (usb_pipein(data_desc->endpoint[0].desc.bEndpointAddress)) {  in usbpn_probe()
370 		pnd->rx_pipe = usb_rcvbulkpipe(usbdev,  in usbpn_probe()
371 			data_desc->endpoint[0].desc.bEndpointAddress);  in usbpn_probe()
372 		pnd->tx_pipe = usb_sndbulkpipe(usbdev,  in usbpn_probe()
373 			data_desc->endpoint[1].desc.bEndpointAddress);  in usbpn_probe()
375 		pnd->rx_pipe = usb_rcvbulkpipe(usbdev,  in usbpn_probe()
376 			data_desc->endpoint[1].desc.bEndpointAddress);  in usbpn_probe()
377 		pnd->tx_pipe = usb_sndbulkpipe(usbdev,  in usbpn_probe()
378 			data_desc->endpoint[0].desc.bEndpointAddress);  in usbpn_probe()
380 	pnd->active_setting = data_desc - data_intf->altsetting;  in usbpn_probe()
386 	/* Force inactive mode until the network device is brought UP */  in usbpn_probe()
387 	usb_set_interface(usbdev, union_header->bSlaveInterface0,  in usbpn_probe()
388 				!pnd->active_setting);  in usbpn_probe()
394 		pnd->disconnected = 1;  in usbpn_probe()
399 	dev_dbg(&dev->dev, "USB CDC Phonet device found\n");  in usbpn_probe()
412 	if (pnd->disconnected)  in usbpn_disconnect()
415 	pnd->disconnected = 1;  in usbpn_disconnect()
417 			(pnd->intf == intf) ? pnd->data_intf : pnd->intf);  in usbpn_disconnect()
418 	unregister_netdev(pnd->dev);  in usbpn_disconnect()
431 MODULE_AUTHOR("Remi Denis-Courmont");