[deliverable/linux.git] / drivers / net / usb / cdc-phonet.c

/*
 * phonet.c -- USB CDC Phonet host driver
 *
 * Copyright (C) 2008-2009 Nokia Corporation. All rights reserved.
 *
 * Author: Rémi Denis-Courmont
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/usb/cdc.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/if_phonet.h>

#define PN_MEDIA_USB	0x1B

static const unsigned rxq_size = 17;

struct usbpn_dev {
	struct net_device	*dev;

	struct usb_interface	*intf, *data_intf;
	struct usb_device	*usb;
	unsigned int		tx_pipe, rx_pipe;
	u8 active_setting;
	u8 disconnected;

	unsigned		tx_queue;
	spinlock_t		tx_lock;

	spinlock_t		rx_lock;
	struct sk_buff		*rx_skb;
	struct urb		*urbs[0];
};

static void tx_complete(struct urb *req);
static void rx_complete(struct urb *req);

/*
 * Network device callbacks
 */
static netdev_tx_t usbpn_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct usbpn_dev *pnd = netdev_priv(dev);
	struct urb *req = NULL;
	unsigned long flags;
	int err;

	if (skb->protocol != htons(ETH_P_PHONET))
		goto drop;

	req = usb_alloc_urb(0, GFP_ATOMIC);
	if (!req)
		goto drop;
	usb_fill_bulk_urb(req, pnd->usb, pnd->tx_pipe, skb->data, skb->len,
				tx_complete, skb);
	req->transfer_flags = URB_ZERO_PACKET;
	err = usb_submit_urb(req, GFP_ATOMIC);
	if (err) {
		usb_free_urb(req);
		goto drop;
	}

	spin_lock_irqsave(&pnd->tx_lock, flags);
	pnd->tx_queue++;
	if (pnd->tx_queue >= dev->tx_queue_len)
		netif_stop_queue(dev);
	spin_unlock_irqrestore(&pnd->tx_lock, flags);
	return NETDEV_TX_OK;

drop:
	dev_kfree_skb(skb);
	dev->stats.tx_dropped++;
	return NETDEV_TX_OK;
}

static void tx_complete(struct urb *req)
{
	struct sk_buff *skb = req->context;
	struct net_device *dev = skb->dev;
	struct usbpn_dev *pnd = netdev_priv(dev);

	switch (req->status) {
	case 0:
		dev->stats.tx_bytes += skb->len;
		break;

	case -ENOENT:
	case -ECONNRESET:
	case -ESHUTDOWN:
		dev->stats.tx_aborted_errors++;
	default:
		dev->stats.tx_errors++;
		dev_dbg(&dev->dev, "TX error (%d)\n", req->status);
	}
	dev->stats.tx_packets++;

	spin_lock(&pnd->tx_lock);
	pnd->tx_queue--;
	netif_wake_queue(dev);
	spin_unlock(&pnd->tx_lock);

	dev_kfree_skb_any(skb);
	usb_free_urb(req);
}

static int rx_submit(struct usbpn_dev *pnd, struct urb *req, gfp_t gfp_flags)
{
	struct net_device *dev = pnd->dev;
	struct page *page;
	int err;

	page = __netdev_alloc_page(dev, gfp_flags);
	if (!page)
		return -ENOMEM;

	usb_fill_bulk_urb(req, pnd->usb, pnd->rx_pipe, page_address(page),
				PAGE_SIZE, rx_complete, dev);
	req->transfer_flags = 0;
	err = usb_submit_urb(req, gfp_flags);
	if (unlikely(err)) {
		dev_dbg(&dev->dev, "RX submit error (%d)\n", err);
		netdev_free_page(dev, page);
	}
	return err;
}

static void rx_complete(struct urb *req)
{
	struct net_device *dev = req->context;
	struct usbpn_dev *pnd = netdev_priv(dev);
	struct page *page = virt_to_page(req->transfer_buffer);
	struct sk_buff *skb;
	unsigned long flags;

	switch (req->status) {
	case 0:
		spin_lock_irqsave(&pnd->rx_lock, flags);
		skb = pnd->rx_skb;
		if (!skb) {
			skb = pnd->rx_skb = netdev_alloc_skb(dev, 12);
			if (likely(skb)) {
				/* Can't use pskb_pull() on page in IRQ */
				memcpy(skb_put(skb, 1), page_address(page), 1);
				skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
						page, 1, req->actual_length);
				page = NULL;
			}
		} else {
			skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
					page, 0, req->actual_length);
			page = NULL;
		}
		if (req->actual_length < PAGE_SIZE)
			pnd->rx_skb = NULL; /* Last fragment */
		else
			skb = NULL;
		spin_unlock_irqrestore(&pnd->rx_lock, flags);
		if (skb) {
			skb->protocol = htons(ETH_P_PHONET);
			skb_reset_mac_header(skb);
			__skb_pull(skb, 1);
			skb->dev = dev;
			dev->stats.rx_packets++;
			dev->stats.rx_bytes += skb->len;

			netif_rx(skb);
		}
		goto resubmit;

	case -ENOENT:
	case -ECONNRESET:
	case -ESHUTDOWN:
		req = NULL;
		break;

	case -EOVERFLOW:
		dev->stats.rx_over_errors++;
		dev_dbg(&dev->dev, "RX overflow\n");
		break;

	case -EILSEQ:
		dev->stats.rx_crc_errors++;
		break;
	}

	dev->stats.rx_errors++;
resubmit:
	if (page)
		netdev_free_page(dev, page);
	if (req)
		rx_submit(pnd, req, GFP_ATOMIC);
}

static int usbpn_close(struct net_device *dev);

static int usbpn_open(struct net_device *dev)
{
	struct usbpn_dev *pnd = netdev_priv(dev);
	int err;
	unsigned i;
	unsigned num = pnd->data_intf->cur_altsetting->desc.bInterfaceNumber;

	err = usb_set_interface(pnd->usb, num, pnd->active_setting);
	if (err)
		return err;

	for (i = 0; i < rxq_size; i++) {
		struct urb *req = usb_alloc_urb(0, GFP_KERNEL);

		if (!req || rx_submit(pnd, req, GFP_KERNEL)) {
			usbpn_close(dev);
			return -ENOMEM;
		}
		pnd->urbs[i] = req;
	}

	netif_wake_queue(dev);
	return 0;
}

static int usbpn_close(struct net_device *dev)
{
	struct usbpn_dev *pnd = netdev_priv(dev);
	unsigned i;
	unsigned num = pnd->data_intf->cur_altsetting->desc.bInterfaceNumber;

	netif_stop_queue(dev);

	for (i = 0; i < rxq_size; i++) {
		struct urb *req = pnd->urbs[i];

		if (!req)
			continue;
		usb_kill_urb(req);
		usb_free_urb(req);
		pnd->urbs[i] = NULL;
	}

	return usb_set_interface(pnd->usb, num, !pnd->active_setting);
}

static int usbpn_set_mtu(struct net_device *dev, int new_mtu)
{
	if ((new_mtu < PHONET_MIN_MTU) || (new_mtu > PHONET_MAX_MTU))
		return -EINVAL;

	dev->mtu = new_mtu;
	return 0;
}

static const struct net_device_ops usbpn_ops = {
	.ndo_open	= usbpn_open,
	.ndo_stop	= usbpn_close,
	.ndo_start_xmit = usbpn_xmit,
	.ndo_change_mtu = usbpn_set_mtu,
};

static void usbpn_setup(struct net_device *dev)
{
	dev->features		= 0;
	dev->netdev_ops		= &usbpn_ops,
	dev->header_ops		= &phonet_header_ops;
	dev->type		= ARPHRD_PHONET;
	dev->flags		= IFF_POINTOPOINT | IFF_NOARP;
	dev->mtu		= PHONET_MAX_MTU;
	dev->hard_header_len	= 1;
	dev->dev_addr[0]	= PN_MEDIA_USB;
	dev->addr_len		= 1;
	dev->tx_queue_len	= 3;

	dev->destructor		= free_netdev;
}

/*
 * USB driver callbacks
 */
static struct usb_device_id usbpn_ids[] = {
	{
		.match_flags = USB_DEVICE_ID_MATCH_VENDOR
			| USB_DEVICE_ID_MATCH_INT_CLASS
			| USB_DEVICE_ID_MATCH_INT_SUBCLASS,
		.idVendor = 0x0421, /* Nokia */
		.bInterfaceClass = USB_CLASS_COMM,
		.bInterfaceSubClass = 0xFE,
	},
	{ },
};

MODULE_DEVICE_TABLE(usb, usbpn_ids);

static struct usb_driver usbpn_driver;

int usbpn_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
	static const char ifname[] = "usbpn%d";
	const struct usb_cdc_union_desc *union_header = NULL;
	const struct usb_cdc_header_desc *phonet_header = NULL;
	const struct usb_host_interface *data_desc;
	struct usb_interface *data_intf;
	struct usb_device *usbdev = interface_to_usbdev(intf);
	struct net_device *dev;
	struct usbpn_dev *pnd;
	u8 *data;
	int len, err;

	data = intf->altsetting->extra;
	len = intf->altsetting->extralen;
	while (len >= 3) {
		u8 dlen = data[0];
		if (dlen < 3)
			return -EINVAL;

		/* bDescriptorType */
		if (data[1] == USB_DT_CS_INTERFACE) {
			/* bDescriptorSubType */
			switch (data[2]) {
			case USB_CDC_UNION_TYPE:
				if (union_header || dlen < 5)
					break;
				union_header =
					(struct usb_cdc_union_desc *)data;
				break;
			case 0xAB:
				if (phonet_header || dlen < 5)
					break;
				phonet_header =
					(struct usb_cdc_header_desc *)data;
				break;
			}
		}
		data += dlen;
		len -= dlen;
	}

	if (!union_header || !phonet_header)
		return -EINVAL;

	data_intf = usb_ifnum_to_if(usbdev, union_header->bSlaveInterface0);
	if (data_intf == NULL)
		return -ENODEV;
	/* Data interface has one inactive and one active setting */
	if (data_intf->num_altsetting != 2)
		return -EINVAL;
	if (data_intf->altsetting[0].desc.bNumEndpoints == 0
	 && data_intf->altsetting[1].desc.bNumEndpoints == 2)
		data_desc = data_intf->altsetting + 1;
	else
	if (data_intf->altsetting[0].desc.bNumEndpoints == 2
	 && data_intf->altsetting[1].desc.bNumEndpoints == 0)
		data_desc = data_intf->altsetting;
	else
		return -EINVAL;

	dev = alloc_netdev(sizeof(*pnd) + sizeof(pnd->urbs[0]) * rxq_size,
				ifname, usbpn_setup);
	if (!dev)
		return -ENOMEM;

	pnd = netdev_priv(dev);
	SET_NETDEV_DEV(dev, &intf->dev);
	netif_stop_queue(dev);

	pnd->dev = dev;
	pnd->usb = usb_get_dev(usbdev);
	pnd->intf = intf;
	pnd->data_intf = data_intf;
	spin_lock_init(&pnd->tx_lock);
	spin_lock_init(&pnd->rx_lock);
	/* Endpoints */
	if (usb_pipein(data_desc->endpoint[0].desc.bEndpointAddress)) {
		pnd->rx_pipe = usb_rcvbulkpipe(usbdev,
			data_desc->endpoint[0].desc.bEndpointAddress);
		pnd->tx_pipe = usb_sndbulkpipe(usbdev,
			data_desc->endpoint[1].desc.bEndpointAddress);
	} else {
		pnd->rx_pipe = usb_rcvbulkpipe(usbdev,
			data_desc->endpoint[1].desc.bEndpointAddress);
		pnd->tx_pipe = usb_sndbulkpipe(usbdev,
			data_desc->endpoint[0].desc.bEndpointAddress);
	}
	pnd->active_setting = data_desc - data_intf->altsetting;

	err = usb_driver_claim_interface(&usbpn_driver, data_intf, pnd);
	if (err)
		goto out;

	/* Force inactive mode until the network device is brought UP */
	usb_set_interface(usbdev, union_header->bSlaveInterface0,
				!pnd->active_setting);
	usb_set_intfdata(intf, pnd);

	err = register_netdev(dev);
	if (err) {
		usb_driver_release_interface(&usbpn_driver, data_intf);
		goto out;
	}

	dev_dbg(&dev->dev, "USB CDC Phonet device found\n");
	return 0;

out:
	usb_set_intfdata(intf, NULL);
	free_netdev(dev);
	return err;
}

static void usbpn_disconnect(struct usb_interface *intf)
{
	struct usbpn_dev *pnd = usb_get_intfdata(intf);
	struct usb_device *usb = pnd->usb;

	if (pnd->disconnected)
		return;

	pnd->disconnected = 1;
	usb_driver_release_interface(&usbpn_driver,
			(pnd->intf == intf) ? pnd->data_intf : pnd->intf);
	unregister_netdev(pnd->dev);
	usb_put_dev(usb);
}

static struct usb_driver usbpn_driver = {
	.name =		"cdc_phonet",
	.probe =	usbpn_probe,
	.disconnect =	usbpn_disconnect,
	.id_table =	usbpn_ids,
};

static int __init usbpn_init(void)
{
	return usb_register(&usbpn_driver);
}

static void __exit usbpn_exit(void)
{
	usb_deregister(&usbpn_driver);
}

module_init(usbpn_init);
module_exit(usbpn_exit);

MODULE_AUTHOR("Remi Denis-Courmont");
MODULE_DESCRIPTION("USB CDC Phonet host interface");
MODULE_LICENSE("GPL");
Commit	Line	Data
87cf6560 RDC	1	/*
	2	* phonet.c -- USB CDC Phonet host driver
	3	*
	4	* Copyright (C) 2008-2009 Nokia Corporation. All rights reserved.
	5	*
	6	* Author: Rémi Denis-Courmont
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* version 2 as published by the Free Software Foundation.
	11	*
	12	* This program is distributed in the hope that it will be useful, but
	13	* WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	20	* 02110-1301 USA
	21	*/
	22
	23	#include <linux/kernel.h>
	24	#include <linux/module.h>
	25	#include <linux/usb.h>
	26	#include <linux/usb/cdc.h>
	27	#include <linux/netdevice.h>
	28	#include <linux/if_arp.h>
	29	#include <linux/if_phonet.h>
	30
	31	#define PN_MEDIA_USB 0x1B
	32
	33	static const unsigned rxq_size = 17;
	34
	35	struct usbpn_dev {
	36	struct net_device *dev;
	37
	38	struct usb_interface intf, data_intf;
	39	struct usb_device *usb;
	40	unsigned int tx_pipe, rx_pipe;
	41	u8 active_setting;
	42	u8 disconnected;
	43
	44	unsigned tx_queue;
	45	spinlock_t tx_lock;
	46
	47	spinlock_t rx_lock;
	48	struct sk_buff *rx_skb;
	49	struct urb *urbs[0];
	50	};
	51
	52	static void tx_complete(struct urb *req);
	53	static void rx_complete(struct urb *req);
	54
	55	/*
	56	* Network device callbacks
	57	*/
25a79c41	58	static netdev_tx_t usbpn_xmit(struct sk_buff skb, struct net_device dev)
87cf6560 RDC	59	{
	60	struct usbpn_dev *pnd = netdev_priv(dev);
	61	struct urb *req = NULL;
	62	unsigned long flags;
	63	int err;
	64
	65	if (skb->protocol != htons(ETH_P_PHONET))
	66	goto drop;
	67
	68	req = usb_alloc_urb(0, GFP_ATOMIC);
	69	if (!req)
	70	goto drop;
	71	usb_fill_bulk_urb(req, pnd->usb, pnd->tx_pipe, skb->data, skb->len,
	72	tx_complete, skb);
	73	req->transfer_flags = URB_ZERO_PACKET;
	74	err = usb_submit_urb(req, GFP_ATOMIC);
	75	if (err) {
	76	usb_free_urb(req);
	77	goto drop;
	78	}
	79
	80	spin_lock_irqsave(&pnd->tx_lock, flags);
	81	pnd->tx_queue++;
	82	if (pnd->tx_queue >= dev->tx_queue_len)
	83	netif_stop_queue(dev);
	84	spin_unlock_irqrestore(&pnd->tx_lock, flags);
25a79c41	85	return NETDEV_TX_OK;
87cf6560 RDC	86
	87	drop:
	88	dev_kfree_skb(skb);
	89	dev->stats.tx_dropped++;
25a79c41	90	return NETDEV_TX_OK;
87cf6560 RDC	91	}
	92
	93	static void tx_complete(struct urb *req)
	94	{
	95	struct sk_buff *skb = req->context;
	96	struct net_device *dev = skb->dev;
	97	struct usbpn_dev *pnd = netdev_priv(dev);
	98
	99	switch (req->status) {
	100	case 0:
	101	dev->stats.tx_bytes += skb->len;
	102	break;
	103
	104	case -ENOENT:
	105	case -ECONNRESET:
	106	case -ESHUTDOWN:
	107	dev->stats.tx_aborted_errors++;
	108	default:
	109	dev->stats.tx_errors++;
	110	dev_dbg(&dev->dev, "TX error (%d)\n", req->status);
	111	}
	112	dev->stats.tx_packets++;
	113
	114	spin_lock(&pnd->tx_lock);
	115	pnd->tx_queue--;
	116	netif_wake_queue(dev);
	117	spin_unlock(&pnd->tx_lock);
	118
	119	dev_kfree_skb_any(skb);
	120	usb_free_urb(req);
	121	}
	122
	123	static int rx_submit(struct usbpn_dev pnd, struct urb req, gfp_t gfp_flags)
	124	{
	125	struct net_device *dev = pnd->dev;
	126	struct page *page;
	127	int err;
	128
	129	page = __netdev_alloc_page(dev, gfp_flags);
	130	if (!page)
	131	return -ENOMEM;
	132
	133	usb_fill_bulk_urb(req, pnd->usb, pnd->rx_pipe, page_address(page),
	134	PAGE_SIZE, rx_complete, dev);
	135	req->transfer_flags = 0;
	136	err = usb_submit_urb(req, gfp_flags);
	137	if (unlikely(err)) {
	138	dev_dbg(&dev->dev, "RX submit error (%d)\n", err);
	139	netdev_free_page(dev, page);
	140	}
	141	return err;
	142	}
	143
	144	static void rx_complete(struct urb *req)
	145	{
	146	struct net_device *dev = req->context;
	147	struct usbpn_dev *pnd = netdev_priv(dev);
	148	struct page *page = virt_to_page(req->transfer_buffer);
	149	struct sk_buff *skb;
	150	unsigned long flags;
	151
	152	switch (req->status) {
	153	case 0:
	154	spin_lock_irqsave(&pnd->rx_lock, flags);
155	skb = pnd->rx_skb;
156	if (!skb) {
157	skb = pnd->rx_skb = netdev_alloc_skb(dev, 12);
158	if (likely(skb)) {
159	/* Can't use pskb_pull() on page in IRQ */
160	memcpy(skb_put(skb, 1), page_address(page), 1);
161	skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
162	page, 1, req->actual_length);
163	page = NULL;
164	}
165	} else {
166	skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
167	page, 0, req->actual_length);
168	page = NULL;
169	}
170	if (req->actual_length < PAGE_SIZE)
171	pnd->rx_skb = NULL; /* Last fragment */
172	else
173	skb = NULL;
174	spin_unlock_irqrestore(&pnd->rx_lock, flags);
175	if (skb) {
176	skb->protocol = htons(ETH_P_PHONET);
177	skb_reset_mac_header(skb);
178	__skb_pull(skb, 1);
179	skb->dev = dev;
180	dev->stats.rx_packets++;
181	dev->stats.rx_bytes += skb->len;
182
183	netif_rx(skb);
184	}
185	goto resubmit;
186
187	case -ENOENT:
188	case -ECONNRESET:
189	case -ESHUTDOWN:
190	req = NULL;
191	break;
192
193	case -EOVERFLOW:
194	dev->stats.rx_over_errors++;
195	dev_dbg(&dev->dev, "RX overflow\n");
196	break;
197
198	case -EILSEQ:
199	dev->stats.rx_crc_errors++;
200	break;
201	}
202
203	dev->stats.rx_errors++;
204	resubmit:
205	if (page)
206	netdev_free_page(dev, page);
207	if (req)
208	rx_submit(pnd, req, GFP_ATOMIC);
209	}
210
211	static int usbpn_close(struct net_device *dev);
212
213	static int usbpn_open(struct net_device *dev)
214	{
215	struct usbpn_dev *pnd = netdev_priv(dev);
216	int err;
217	unsigned i;
218	unsigned num = pnd->data_intf->cur_altsetting->desc.bInterfaceNumber;
219
220	err = usb_set_interface(pnd->usb, num, pnd->active_setting);
221	if (err)
222	return err;
223
224	for (i = 0; i < rxq_size; i++) {
225	struct urb *req = usb_alloc_urb(0, GFP_KERNEL);
226
227	if (!req \|\| rx_submit(pnd, req, GFP_KERNEL)) {
228	usbpn_close(dev);
229	return -ENOMEM;
230	}
231	pnd->urbs[i] = req;
232	}
233
234	netif_wake_queue(dev);
235	return 0;
236	}
237
238	static int usbpn_close(struct net_device *dev)
239	{
240	struct usbpn_dev *pnd = netdev_priv(dev);
241	unsigned i;
242	unsigned num = pnd->data_intf->cur_altsetting->desc.bInterfaceNumber;
243
244	netif_stop_queue(dev);
245
246	for (i = 0; i < rxq_size; i++) {
247	struct urb *req = pnd->urbs[i];
248
249	if (!req)
250	continue;
251	usb_kill_urb(req);
252	usb_free_urb(req);
253	pnd->urbs[i] = NULL;
254	}
255
256	return usb_set_interface(pnd->usb, num, !pnd->active_setting);
257	}
258
259	static int usbpn_set_mtu(struct net_device *dev, int new_mtu)
260	{
261	if ((new_mtu < PHONET_MIN_MTU) \|\| (new_mtu > PHONET_MAX_MTU))
262	return -EINVAL;
263
264	dev->mtu = new_mtu;
265	return 0;
266	}
267
268	static const struct net_device_ops usbpn_ops = {
269	.ndo_open = usbpn_open,
270	.ndo_stop = usbpn_close,
271	.ndo_start_xmit = usbpn_xmit,
272	.ndo_change_mtu = usbpn_set_mtu,
273	};
274
275	static void usbpn_setup(struct net_device *dev)
276	{
277	dev->features = 0;
278	dev->netdev_ops = &usbpn_ops,
279	dev->header_ops = &phonet_header_ops;
280	dev->type = ARPHRD_PHONET;
281	dev->flags = IFF_POINTOPOINT \| IFF_NOARP;
282	dev->mtu = PHONET_MAX_MTU;
283	dev->hard_header_len = 1;
284	dev->dev_addr[0] = PN_MEDIA_USB;
285	dev->addr_len = 1;
286	dev->tx_queue_len = 3;
287
288	dev->destructor = free_netdev;
289	}
290
291	/*
292	* USB driver callbacks
293	*/
294	static struct usb_device_id usbpn_ids[] = {
295	{
296	.match_flags = USB_DEVICE_ID_MATCH_VENDOR
297	\| USB_DEVICE_ID_MATCH_INT_CLASS
298	\| USB_DEVICE_ID_MATCH_INT_SUBCLASS,
299	.idVendor = 0x0421, /* Nokia */
300	.bInterfaceClass = USB_CLASS_COMM,
301	.bInterfaceSubClass = 0xFE,
302	},
303	{ },
304	};
305
306	MODULE_DEVICE_TABLE(usb, usbpn_ids);
307
308	static struct usb_driver usbpn_driver;
309
310	int usbpn_probe(struct usb_interface intf, const struct usb_device_id id)
311	{
312	static const char ifname[] = "usbpn%d";
313	const struct usb_cdc_union_desc *union_header = NULL;
314	const struct usb_cdc_header_desc *phonet_header = NULL;
315	const struct usb_host_interface *data_desc;
316	struct usb_interface *data_intf;
317	struct usb_device *usbdev = interface_to_usbdev(intf);
318	struct net_device *dev;
319	struct usbpn_dev *pnd;
320	u8 *data;
321	int len, err;
322
323	data = intf->altsetting->extra;
324	len = intf->altsetting->extralen;
325	while (len >= 3) {
326	u8 dlen = data[0];
327	if (dlen < 3)
328	return -EINVAL;
329
330	/* bDescriptorType */
331	if (data[1] == USB_DT_CS_INTERFACE) {
332	/* bDescriptorSubType */
333	switch (data[2]) {
334	case USB_CDC_UNION_TYPE:
335	if (union_header \|\| dlen < 5)
336	break;
337	union_header =
338	(struct usb_cdc_union_desc *)data;
339	break;
340	case 0xAB:
341	if (phonet_header \|\| dlen < 5)
342	break;
343	phonet_header =
344	(struct usb_cdc_header_desc *)data;
345	break;
346	}
347	}
348	data += dlen;
349	len -= dlen;
350	}
351
352	if (!union_header \|\| !phonet_header)
353	return -EINVAL;
354
355	data_intf = usb_ifnum_to_if(usbdev, union_header->bSlaveInterface0);
356	if (data_intf == NULL)
357	return -ENODEV;
358	/* Data interface has one inactive and one active setting */
359	if (data_intf->num_altsetting != 2)
360	return -EINVAL;
361	if (data_intf->altsetting[0].desc.bNumEndpoints == 0
362	&& data_intf->altsetting[1].desc.bNumEndpoints == 2)
363	data_desc = data_intf->altsetting + 1;
364	else
365	if (data_intf->altsetting[0].desc.bNumEndpoints == 2
366	&& data_intf->altsetting[1].desc.bNumEndpoints == 0)
367	data_desc = data_intf->altsetting;
368	else
369	return -EINVAL;
370
371	dev = alloc_netdev(sizeof(pnd) + sizeof(pnd->urbs[0]) rxq_size,
372	ifname, usbpn_setup);
373	if (!dev)
374	return -ENOMEM;
375
376	pnd = netdev_priv(dev);
377	SET_NETDEV_DEV(dev, &intf->dev);
378	netif_stop_queue(dev);
379
380	pnd->dev = dev;
381	pnd->usb = usb_get_dev(usbdev);
382	pnd->intf = intf;
383	pnd->data_intf = data_intf;
384	spin_lock_init(&pnd->tx_lock);
385	spin_lock_init(&pnd->rx_lock);
386	/* Endpoints */
387	if (usb_pipein(data_desc->endpoint[0].desc.bEndpointAddress)) {
388	pnd->rx_pipe = usb_rcvbulkpipe(usbdev,
389	data_desc->endpoint[0].desc.bEndpointAddress);
390	pnd->tx_pipe = usb_sndbulkpipe(usbdev,
391	data_desc->endpoint[1].desc.bEndpointAddress);
392	} else {
393	pnd->rx_pipe = usb_rcvbulkpipe(usbdev,
394	data_desc->endpoint[1].desc.bEndpointAddress);
395	pnd->tx_pipe = usb_sndbulkpipe(usbdev,
396	data_desc->endpoint[0].desc.bEndpointAddress);
397	}
398	pnd->active_setting = data_desc - data_intf->altsetting;
399
400	err = usb_driver_claim_interface(&usbpn_driver, data_intf, pnd);
401	if (err)
402	goto out;
403
404	/* Force inactive mode until the network device is brought UP */
405	usb_set_interface(usbdev, union_header->bSlaveInterface0,
406	!pnd->active_setting);
407	usb_set_intfdata(intf, pnd);
408
409	err = register_netdev(dev);
410	if (err) {
411	usb_driver_release_interface(&usbpn_driver, data_intf);
412	goto out;
413	}
414
415	dev_dbg(&dev->dev, "USB CDC Phonet device found\n");
416	return 0;
417
418	out:
419	usb_set_intfdata(intf, NULL);
420	free_netdev(dev);
421	return err;
422	}
423
424	static void usbpn_disconnect(struct usb_interface *intf)
425	{
426	struct usbpn_dev *pnd = usb_get_intfdata(intf);
427	struct usb_device *usb = pnd->usb;
428
429	if (pnd->disconnected)
430	return;
431
432	pnd->disconnected = 1;
433	usb_driver_release_interface(&usbpn_driver,
434	(pnd->intf == intf) ? pnd->data_intf : pnd->intf);
435	unregister_netdev(pnd->dev);
436	usb_put_dev(usb);
437	}
438
439	static struct usb_driver usbpn_driver = {
440	.name = "cdc_phonet",
441	.probe = usbpn_probe,
442	.disconnect = usbpn_disconnect,
443	.id_table = usbpn_ids,
444	};
445
446	static int __init usbpn_init(void)
447	{
448	return usb_register(&usbpn_driver);
449	}
450
451	static void __exit usbpn_exit(void)
452	{
453	usb_deregister(&usbpn_driver);
454	}
455
456	module_init(usbpn_init);
457	module_exit(usbpn_exit);
458
459	MODULE_AUTHOR("Remi Denis-Courmont");
460	MODULE_DESCRIPTION("USB CDC Phonet host interface");
461	MODULE_LICENSE("GPL");