[net-next-2.6.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/gfp.h>
#include <linux/usb.h>
#include <linux/usb/cdc.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/if_phonet.h>
#include <linux/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_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
	struct if_phonet_req *req = (struct if_phonet_req *)ifr;

	switch (cmd) {
	case SIOCPNGAUTOCONF:
		req->ifr_phonet_autoconf.device = PN_DEV_PC;
		return 0;
	}
	return -ENOIOCTLCMD;
}

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_do_ioctl	= usbpn_ioctl,
	.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>
5a0e3ad6	25	#include <linux/gfp.h>
87cf6560 RDC	26	#include <linux/usb.h>
	27	#include <linux/usb/cdc.h>
	28	#include <linux/netdevice.h>
	29	#include <linux/if_arp.h>
	30	#include <linux/if_phonet.h>
02571f89	31	#include <linux/phonet.h>
87cf6560 RDC	32
	33	#define PN_MEDIA_USB 0x1B
	34
	35	static const unsigned rxq_size = 17;
	36
	37	struct usbpn_dev {
	38	struct net_device *dev;
	39
	40	struct usb_interface intf, data_intf;
	41	struct usb_device *usb;
	42	unsigned int tx_pipe, rx_pipe;
	43	u8 active_setting;
	44	u8 disconnected;
	45
	46	unsigned tx_queue;
	47	spinlock_t tx_lock;
	48
	49	spinlock_t rx_lock;
	50	struct sk_buff *rx_skb;
	51	struct urb *urbs[0];
	52	};
	53
	54	static void tx_complete(struct urb *req);
	55	static void rx_complete(struct urb *req);
	56
	57	/*
	58	* Network device callbacks
	59	*/
25a79c41	60	static netdev_tx_t usbpn_xmit(struct sk_buff skb, struct net_device dev)
87cf6560 RDC	61	{
	62	struct usbpn_dev *pnd = netdev_priv(dev);
	63	struct urb *req = NULL;
	64	unsigned long flags;
	65	int err;
	66
	67	if (skb->protocol != htons(ETH_P_PHONET))
	68	goto drop;
	69
	70	req = usb_alloc_urb(0, GFP_ATOMIC);
	71	if (!req)
	72	goto drop;
	73	usb_fill_bulk_urb(req, pnd->usb, pnd->tx_pipe, skb->data, skb->len,
	74	tx_complete, skb);
	75	req->transfer_flags = URB_ZERO_PACKET;
	76	err = usb_submit_urb(req, GFP_ATOMIC);
	77	if (err) {
	78	usb_free_urb(req);
	79	goto drop;
	80	}
	81
	82	spin_lock_irqsave(&pnd->tx_lock, flags);
	83	pnd->tx_queue++;
	84	if (pnd->tx_queue >= dev->tx_queue_len)
	85	netif_stop_queue(dev);
	86	spin_unlock_irqrestore(&pnd->tx_lock, flags);
25a79c41	87	return NETDEV_TX_OK;
87cf6560 RDC	88
	89	drop:
	90	dev_kfree_skb(skb);
	91	dev->stats.tx_dropped++;
25a79c41	92	return NETDEV_TX_OK;
87cf6560 RDC	93	}
	94
	95	static void tx_complete(struct urb *req)
	96	{
	97	struct sk_buff *skb = req->context;
	98	struct net_device *dev = skb->dev;
	99	struct usbpn_dev *pnd = netdev_priv(dev);
	100
	101	switch (req->status) {
	102	case 0:
	103	dev->stats.tx_bytes += skb->len;
	104	break;
	105
	106	case -ENOENT:
	107	case -ECONNRESET:
	108	case -ESHUTDOWN:
	109	dev->stats.tx_aborted_errors++;
	110	default:
	111	dev->stats.tx_errors++;
	112	dev_dbg(&dev->dev, "TX error (%d)\n", req->status);
	113	}
	114	dev->stats.tx_packets++;
	115
	116	spin_lock(&pnd->tx_lock);
	117	pnd->tx_queue--;
	118	netif_wake_queue(dev);
	119	spin_unlock(&pnd->tx_lock);
	120
	121	dev_kfree_skb_any(skb);
	122	usb_free_urb(req);
	123	}
	124
	125	static int rx_submit(struct usbpn_dev pnd, struct urb req, gfp_t gfp_flags)
	126	{
	127	struct net_device *dev = pnd->dev;
	128	struct page *page;
	129	int err;
	130
	131	page = __netdev_alloc_page(dev, gfp_flags);
	132	if (!page)
	133	return -ENOMEM;
	134
	135	usb_fill_bulk_urb(req, pnd->usb, pnd->rx_pipe, page_address(page),
	136	PAGE_SIZE, rx_complete, dev);
	137	req->transfer_flags = 0;
	138	err = usb_submit_urb(req, gfp_flags);
	139	if (unlikely(err)) {
	140	dev_dbg(&dev->dev, "RX submit error (%d)\n", err);
	141	netdev_free_page(dev, page);
	142	}
	143	return err;
	144	}
	145
	146	static void rx_complete(struct urb *req)
	147	{
	148	struct net_device *dev = req->context;
	149	struct usbpn_dev *pnd = netdev_priv(dev);
	150	struct page *page = virt_to_page(req->transfer_buffer);
	151	struct sk_buff *skb;
	152	unsigned long flags;
	153
	154	switch (req->status) {
	155	case 0:
	156	spin_lock_irqsave(&pnd->rx_lock, flags);
157	skb = pnd->rx_skb;
158	if (!skb) {
159	skb = pnd->rx_skb = netdev_alloc_skb(dev, 12);
160	if (likely(skb)) {
161	/* Can't use pskb_pull() on page in IRQ */
162	memcpy(skb_put(skb, 1), page_address(page), 1);
163	skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
164	page, 1, req->actual_length);
165	page = NULL;
166	}
167	} else {
168	skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
169	page, 0, req->actual_length);
170	page = NULL;
171	}
172	if (req->actual_length < PAGE_SIZE)
173	pnd->rx_skb = NULL; /* Last fragment */
174	else
175	skb = NULL;
176	spin_unlock_irqrestore(&pnd->rx_lock, flags);
177	if (skb) {
178	skb->protocol = htons(ETH_P_PHONET);
179	skb_reset_mac_header(skb);
180	__skb_pull(skb, 1);
181	skb->dev = dev;
182	dev->stats.rx_packets++;
183	dev->stats.rx_bytes += skb->len;
184
185	netif_rx(skb);
186	}
187	goto resubmit;
188
189	case -ENOENT:
190	case -ECONNRESET:
191	case -ESHUTDOWN:
192	req = NULL;
193	break;
194
195	case -EOVERFLOW:
196	dev->stats.rx_over_errors++;
197	dev_dbg(&dev->dev, "RX overflow\n");
198	break;
199
200	case -EILSEQ:
201	dev->stats.rx_crc_errors++;
202	break;
203	}
204
205	dev->stats.rx_errors++;
206	resubmit:
207	if (page)
208	netdev_free_page(dev, page);
209	if (req)
210	rx_submit(pnd, req, GFP_ATOMIC);
211	}
212
213	static int usbpn_close(struct net_device *dev);
214
215	static int usbpn_open(struct net_device *dev)
216	{
217	struct usbpn_dev *pnd = netdev_priv(dev);
218	int err;
219	unsigned i;
220	unsigned num = pnd->data_intf->cur_altsetting->desc.bInterfaceNumber;
221
222	err = usb_set_interface(pnd->usb, num, pnd->active_setting);
223	if (err)
224	return err;
225
226	for (i = 0; i < rxq_size; i++) {
227	struct urb *req = usb_alloc_urb(0, GFP_KERNEL);
228
229	if (!req \|\| rx_submit(pnd, req, GFP_KERNEL)) {
230	usbpn_close(dev);
231	return -ENOMEM;
232	}
233	pnd->urbs[i] = req;
234	}
235
236	netif_wake_queue(dev);
237	return 0;
238	}
239
240	static int usbpn_close(struct net_device *dev)
241	{
242	struct usbpn_dev *pnd = netdev_priv(dev);
243	unsigned i;
244	unsigned num = pnd->data_intf->cur_altsetting->desc.bInterfaceNumber;
245
246	netif_stop_queue(dev);
247
248	for (i = 0; i < rxq_size; i++) {
249	struct urb *req = pnd->urbs[i];
250
251	if (!req)
252	continue;
253	usb_kill_urb(req);
254	usb_free_urb(req);
255	pnd->urbs[i] = NULL;
256	}
257
258	return usb_set_interface(pnd->usb, num, !pnd->active_setting);
259	}
260
02571f89 RDC	261	static int usbpn_ioctl(struct net_device dev, struct ifreq ifr, int cmd)
	262	{
	263	struct if_phonet_req req = (struct if_phonet_req )ifr;
	264
	265	switch (cmd) {
	266	case SIOCPNGAUTOCONF:
	267	req->ifr_phonet_autoconf.device = PN_DEV_PC;
02571f89 RDC	268	return 0;
	269	}
	270	return -ENOIOCTLCMD;
	271	}
	272
87cf6560 RDC	273	static int usbpn_set_mtu(struct net_device *dev, int new_mtu)
	274	{
	275	if ((new_mtu < PHONET_MIN_MTU) \|\| (new_mtu > PHONET_MAX_MTU))
	276	return -EINVAL;
	277
	278	dev->mtu = new_mtu;
	279	return 0;
	280	}
	281
	282	static const struct net_device_ops usbpn_ops = {
	283	.ndo_open = usbpn_open,
	284	.ndo_stop = usbpn_close,
	285	.ndo_start_xmit = usbpn_xmit,
02571f89	286	.ndo_do_ioctl = usbpn_ioctl,
87cf6560 RDC	287	.ndo_change_mtu = usbpn_set_mtu,
	288	};
	289
	290	static void usbpn_setup(struct net_device *dev)
	291	{
	292	dev->features = 0;
	293	dev->netdev_ops = &usbpn_ops,
	294	dev->header_ops = &phonet_header_ops;
	295	dev->type = ARPHRD_PHONET;
	296	dev->flags = IFF_POINTOPOINT \| IFF_NOARP;
	297	dev->mtu = PHONET_MAX_MTU;
	298	dev->hard_header_len = 1;
	299	dev->dev_addr[0] = PN_MEDIA_USB;
	300	dev->addr_len = 1;
	301	dev->tx_queue_len = 3;
	302
	303	dev->destructor = free_netdev;
	304	}
	305
	306	/*
	307	* USB driver callbacks
	308	*/
	309	static struct usb_device_id usbpn_ids[] = {
	310	{
	311	.match_flags = USB_DEVICE_ID_MATCH_VENDOR
	312	\| USB_DEVICE_ID_MATCH_INT_CLASS
	313	\| USB_DEVICE_ID_MATCH_INT_SUBCLASS,
	314	.idVendor = 0x0421, /* Nokia */
	315	.bInterfaceClass = USB_CLASS_COMM,
	316	.bInterfaceSubClass = 0xFE,
	317	},
	318	{ },
	319	};
	320
	321	MODULE_DEVICE_TABLE(usb, usbpn_ids);
	322
	323	static struct usb_driver usbpn_driver;
	324
	325	int usbpn_probe(struct usb_interface intf, const struct usb_device_id id)
	326	{
	327	static const char ifname[] = "usbpn%d";
	328	const struct usb_cdc_union_desc *union_header = NULL;
	329	const struct usb_cdc_header_desc *phonet_header = NULL;
	330	const struct usb_host_interface *data_desc;
	331	struct usb_interface *data_intf;
	332	struct usb_device *usbdev = interface_to_usbdev(intf);
	333	struct net_device *dev;
	334	struct usbpn_dev *pnd;
	335	u8 *data;
	336	int len, err;
	337
	338	data = intf->altsetting->extra;
	339	len = intf->altsetting->extralen;
	340	while (len >= 3) {
	341	u8 dlen = data[0];
	342	if (dlen < 3)
	343	return -EINVAL;
	344
	345	/* bDescriptorType */
	346	if (data[1] == USB_DT_CS_INTERFACE) {
	347	/* bDescriptorSubType */
	348	switch (data[2]) {
	349	case USB_CDC_UNION_TYPE:
	350	if (union_header \|\| dlen < 5)
351	break;
352	union_header =
353	(struct usb_cdc_union_desc *)data;
354	break;
355	case 0xAB:
356	if (phonet_header \|\| dlen < 5)
357	break;
358	phonet_header =
359	(struct usb_cdc_header_desc *)data;
360	break;
361	}
362	}
363	data += dlen;
364	len -= dlen;
365	}
366
367	if (!union_header \|\| !phonet_header)
368	return -EINVAL;
369
370	data_intf = usb_ifnum_to_if(usbdev, union_header->bSlaveInterface0);
371	if (data_intf == NULL)
372	return -ENODEV;
373	/* Data interface has one inactive and one active setting */
374	if (data_intf->num_altsetting != 2)
375	return -EINVAL;
8e95a202 JP	376	if (data_intf->altsetting[0].desc.bNumEndpoints == 0 &&
8e95a202 JP	377	data_intf->altsetting[1].desc.bNumEndpoints == 2)
87cf6560 RDC	378	data_desc = data_intf->altsetting + 1;
87cf6560 RDC	379	else
8e95a202 JP	380	if (data_intf->altsetting[0].desc.bNumEndpoints == 2 &&
8e95a202 JP	381	data_intf->altsetting[1].desc.bNumEndpoints == 0)
87cf6560 RDC	382	data_desc = data_intf->altsetting;
	383	else
	384	return -EINVAL;
	385
	386	dev = alloc_netdev(sizeof(pnd) + sizeof(pnd->urbs[0]) rxq_size,
	387	ifname, usbpn_setup);
	388	if (!dev)
	389	return -ENOMEM;
	390
	391	pnd = netdev_priv(dev);
	392	SET_NETDEV_DEV(dev, &intf->dev);
	393	netif_stop_queue(dev);
	394
	395	pnd->dev = dev;
	396	pnd->usb = usb_get_dev(usbdev);
	397	pnd->intf = intf;
	398	pnd->data_intf = data_intf;
	399	spin_lock_init(&pnd->tx_lock);
	400	spin_lock_init(&pnd->rx_lock);
	401	/* Endpoints */
	402	if (usb_pipein(data_desc->endpoint[0].desc.bEndpointAddress)) {
	403	pnd->rx_pipe = usb_rcvbulkpipe(usbdev,
	404	data_desc->endpoint[0].desc.bEndpointAddress);
	405	pnd->tx_pipe = usb_sndbulkpipe(usbdev,
	406	data_desc->endpoint[1].desc.bEndpointAddress);
	407	} else {
	408	pnd->rx_pipe = usb_rcvbulkpipe(usbdev,
	409	data_desc->endpoint[1].desc.bEndpointAddress);
	410	pnd->tx_pipe = usb_sndbulkpipe(usbdev,
	411	data_desc->endpoint[0].desc.bEndpointAddress);
	412	}
	413	pnd->active_setting = data_desc - data_intf->altsetting;
	414
	415	err = usb_driver_claim_interface(&usbpn_driver, data_intf, pnd);
	416	if (err)
	417	goto out;
	418
	419	/* Force inactive mode until the network device is brought UP */
	420	usb_set_interface(usbdev, union_header->bSlaveInterface0,
	421	!pnd->active_setting);
	422	usb_set_intfdata(intf, pnd);
	423
	424	err = register_netdev(dev);
	425	if (err) {
	426	usb_driver_release_interface(&usbpn_driver, data_intf);
	427	goto out;
	428	}
	429
	430	dev_dbg(&dev->dev, "USB CDC Phonet device found\n");
	431	return 0;
	432
	433	out:
	434	usb_set_intfdata(intf, NULL);
	435	free_netdev(dev);
	436	return err;
	437	}
	438
	439	static void usbpn_disconnect(struct usb_interface *intf)
	440	{
	441	struct usbpn_dev *pnd = usb_get_intfdata(intf);
	442	struct usb_device *usb = pnd->usb;
	443
	444	if (pnd->disconnected)
	445	return;
446
447	pnd->disconnected = 1;
448	usb_driver_release_interface(&usbpn_driver,
449	(pnd->intf == intf) ? pnd->data_intf : pnd->intf);
450	unregister_netdev(pnd->dev);
451	usb_put_dev(usb);
452	}
453
454	static struct usb_driver usbpn_driver = {
455	.name = "cdc_phonet",
456	.probe = usbpn_probe,
457	.disconnect = usbpn_disconnect,
458	.id_table = usbpn_ids,
459	};
460
461	static int __init usbpn_init(void)
462	{
463	return usb_register(&usbpn_driver);
464	}
465
466	static void __exit usbpn_exit(void)
467	{
468	usb_deregister(&usbpn_driver);
469	}
470
471	module_init(usbpn_init);
472	module_exit(usbpn_exit);
473
474	MODULE_AUTHOR("Remi Denis-Courmont");
475	MODULE_DESCRIPTION("USB CDC Phonet host interface");
476	MODULE_LICENSE("GPL");