[linux-2.6-block.git] / drivers / usb / gadget / f_phonet.c

/*
 * f_phonet.c -- USB CDC Phonet function
 *
 * Copyright (C) 2007-2008 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/slab.h>
#include <linux/kernel.h>
#include <linux/device.h>

#include <linux/netdevice.h>
#include <linux/if_ether.h>
#include <linux/if_phonet.h>
#include <linux/if_arp.h>

#include <linux/usb/ch9.h>
#include <linux/usb/cdc.h>
#include <linux/usb/composite.h>

#include "u_phonet.h"

#define PN_MEDIA_USB	0x1B
#define MAXPACKET	512
#if (PAGE_SIZE % MAXPACKET)
#error MAXPACKET must divide PAGE_SIZE!
#endif

/*-------------------------------------------------------------------------*/

struct phonet_port {
	struct f_phonet			*usb;
	spinlock_t			lock;
};

struct f_phonet {
	struct usb_function		function;
	struct {
		struct sk_buff		*skb;
		spinlock_t		lock;
	} rx;
	struct net_device		*dev;
	struct usb_ep			*in_ep, *out_ep;

	struct usb_request		*in_req;
	struct usb_request		*out_reqv[0];
};

static int phonet_rxq_size = 17;

static inline struct f_phonet *func_to_pn(struct usb_function *f)
{
	return container_of(f, struct f_phonet, function);
}

/*-------------------------------------------------------------------------*/

#define USB_CDC_SUBCLASS_PHONET	0xfe
#define USB_CDC_PHONET_TYPE	0xab

static struct usb_interface_descriptor
pn_control_intf_desc = {
	.bLength =		sizeof pn_control_intf_desc,
	.bDescriptorType =	USB_DT_INTERFACE,

	/* .bInterfaceNumber =	DYNAMIC, */
	.bInterfaceClass =	USB_CLASS_COMM,
	.bInterfaceSubClass =	USB_CDC_SUBCLASS_PHONET,
};

static const struct usb_cdc_header_desc
pn_header_desc = {
	.bLength =		sizeof pn_header_desc,
	.bDescriptorType =	USB_DT_CS_INTERFACE,
	.bDescriptorSubType =	USB_CDC_HEADER_TYPE,
	.bcdCDC =		cpu_to_le16(0x0110),
};

static const struct usb_cdc_header_desc
pn_phonet_desc = {
	.bLength =		sizeof pn_phonet_desc,
	.bDescriptorType =	USB_DT_CS_INTERFACE,
	.bDescriptorSubType =	USB_CDC_PHONET_TYPE,
	.bcdCDC =		cpu_to_le16(0x1505), /* ??? */
};

static struct usb_cdc_union_desc
pn_union_desc = {
	.bLength =		sizeof pn_union_desc,
	.bDescriptorType =	USB_DT_CS_INTERFACE,
	.bDescriptorSubType =	USB_CDC_UNION_TYPE,

	/* .bMasterInterface0 =	DYNAMIC, */
	/* .bSlaveInterface0 =	DYNAMIC, */
};

static struct usb_interface_descriptor
pn_data_nop_intf_desc = {
	.bLength =		sizeof pn_data_nop_intf_desc,
	.bDescriptorType =	USB_DT_INTERFACE,

	/* .bInterfaceNumber =	DYNAMIC, */
	.bAlternateSetting =	0,
	.bNumEndpoints =	0,
	.bInterfaceClass =	USB_CLASS_CDC_DATA,
};

static struct usb_interface_descriptor
pn_data_intf_desc = {
	.bLength =		sizeof pn_data_intf_desc,
	.bDescriptorType =	USB_DT_INTERFACE,

	/* .bInterfaceNumber =	DYNAMIC, */
	.bAlternateSetting =	1,
	.bNumEndpoints =	2,
	.bInterfaceClass =	USB_CLASS_CDC_DATA,
};

static struct usb_endpoint_descriptor
pn_fs_sink_desc = {
	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,

	.bEndpointAddress =	USB_DIR_OUT,
	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
};

static struct usb_endpoint_descriptor
pn_hs_sink_desc = {
	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,

	.bEndpointAddress =	USB_DIR_OUT,
	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
	.wMaxPacketSize =	cpu_to_le16(MAXPACKET),
};

static struct usb_endpoint_descriptor
pn_fs_source_desc = {
	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,

	.bEndpointAddress =	USB_DIR_IN,
	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
};

static struct usb_endpoint_descriptor
pn_hs_source_desc = {
	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,

	.bEndpointAddress =	USB_DIR_IN,
	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
	.wMaxPacketSize =	cpu_to_le16(512),
};

static struct usb_descriptor_header *fs_pn_function[] = {
	(struct usb_descriptor_header *) &pn_control_intf_desc,
	(struct usb_descriptor_header *) &pn_header_desc,
	(struct usb_descriptor_header *) &pn_phonet_desc,
	(struct usb_descriptor_header *) &pn_union_desc,
	(struct usb_descriptor_header *) &pn_data_nop_intf_desc,
	(struct usb_descriptor_header *) &pn_data_intf_desc,
	(struct usb_descriptor_header *) &pn_fs_sink_desc,
	(struct usb_descriptor_header *) &pn_fs_source_desc,
	NULL,
};

static struct usb_descriptor_header *hs_pn_function[] = {
	(struct usb_descriptor_header *) &pn_control_intf_desc,
	(struct usb_descriptor_header *) &pn_header_desc,
	(struct usb_descriptor_header *) &pn_phonet_desc,
	(struct usb_descriptor_header *) &pn_union_desc,
	(struct usb_descriptor_header *) &pn_data_nop_intf_desc,
	(struct usb_descriptor_header *) &pn_data_intf_desc,
	(struct usb_descriptor_header *) &pn_hs_sink_desc,
	(struct usb_descriptor_header *) &pn_hs_source_desc,
	NULL,
};

/*-------------------------------------------------------------------------*/

static int pn_net_open(struct net_device *dev)
{
	netif_wake_queue(dev);
	return 0;
}

static int pn_net_close(struct net_device *dev)
{
	netif_stop_queue(dev);
	return 0;
}

static void pn_tx_complete(struct usb_ep *ep, struct usb_request *req)
{
	struct f_phonet *fp = ep->driver_data;
	struct net_device *dev = fp->dev;
	struct sk_buff *skb = req->context;

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

	case -ESHUTDOWN: /* disconnected */
	case -ECONNRESET: /* disabled */
		dev->stats.tx_aborted_errors++;
	default:
		dev->stats.tx_errors++;
	}

	dev_kfree_skb_any(skb);
	netif_wake_queue(dev);
}

static int pn_net_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct phonet_port *port = netdev_priv(dev);
	struct f_phonet *fp;
	struct usb_request *req;
	unsigned long flags;

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

	spin_lock_irqsave(&port->lock, flags);
	fp = port->usb;
	if (unlikely(!fp)) /* race with carrier loss */
		goto out_unlock;

	req = fp->in_req;
	req->buf = skb->data;
	req->length = skb->len;
	req->complete = pn_tx_complete;
	req->zero = 1;
	req->context = skb;

	if (unlikely(usb_ep_queue(fp->in_ep, req, GFP_ATOMIC)))
		goto out_unlock;

	netif_stop_queue(dev);
	skb = NULL;

out_unlock:
	spin_unlock_irqrestore(&port->lock, flags);
out:
	if (unlikely(skb)) {
		dev_kfree_skb(skb);
		dev->stats.tx_dropped++;
	}
	return NETDEV_TX_OK;
}

static int pn_net_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 pn_netdev_ops = {
	.ndo_open	= pn_net_open,
	.ndo_stop	= pn_net_close,
	.ndo_start_xmit	= pn_net_xmit,
	.ndo_change_mtu	= pn_net_mtu,
};

static void pn_net_setup(struct net_device *dev)
{
	dev->features		= 0;
	dev->type		= ARPHRD_PHONET;
	dev->flags		= IFF_POINTOPOINT | IFF_NOARP;
	dev->mtu		= PHONET_DEV_MTU;
	dev->hard_header_len	= 1;
	dev->dev_addr[0]	= PN_MEDIA_USB;
	dev->addr_len		= 1;
	dev->tx_queue_len	= 1;

	dev->netdev_ops		= &pn_netdev_ops;
	dev->destructor		= free_netdev;
	dev->header_ops		= &phonet_header_ops;
}

/*-------------------------------------------------------------------------*/

/*
 * Queue buffer for data from the host
 */
static int
pn_rx_submit(struct f_phonet *fp, struct usb_request *req, gfp_t gfp_flags)
{
	struct net_device *dev = fp->dev;
	struct page *page;
	int err;

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

	req->buf = page_address(page);
	req->length = PAGE_SIZE;
	req->context = page;

	err = usb_ep_queue(fp->out_ep, req, gfp_flags);
	if (unlikely(err))
		netdev_free_page(dev, page);
	return err;
}

static void pn_rx_complete(struct usb_ep *ep, struct usb_request *req)
{
	struct f_phonet *fp = ep->driver_data;
	struct net_device *dev = fp->dev;
	struct page *page = req->context;
	struct sk_buff *skb;
	unsigned long flags;
	int status = req->status;

	switch (status) {
	case 0:
		spin_lock_irqsave(&fp->rx.lock, flags);
		skb = fp->rx.skb;
		if (!skb)
			skb = fp->rx.skb = netdev_alloc_skb(dev, 12);
		if (req->actual < req->length) /* Last fragment */
			fp->rx.skb = NULL;
		spin_unlock_irqrestore(&fp->rx.lock, flags);

		if (unlikely(!skb))
			break;
		skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, 0,
				req->actual);
		page = NULL;

		if (req->actual < req->length) { /* Last fragment */
			skb->protocol = htons(ETH_P_PHONET);
			skb_reset_mac_header(skb);
			pskb_pull(skb, 1);
			skb->dev = dev;
			dev->stats.rx_packets++;
			dev->stats.rx_bytes += skb->len;

			netif_rx(skb);
		}
		break;

	/* Do not resubmit in these cases: */
	case -ESHUTDOWN: /* disconnect */
	case -ECONNABORTED: /* hw reset */
	case -ECONNRESET: /* dequeued (unlink or netif down) */
		req = NULL;
		break;

	/* Do resubmit in these cases: */
	case -EOVERFLOW: /* request buffer overflow */
		dev->stats.rx_over_errors++;
	default:
		dev->stats.rx_errors++;
		break;
	}

	if (page)
		netdev_free_page(dev, page);
	if (req)
		pn_rx_submit(fp, req, GFP_ATOMIC);
}

/*-------------------------------------------------------------------------*/

static void __pn_reset(struct usb_function *f)
{
	struct f_phonet *fp = func_to_pn(f);
	struct net_device *dev = fp->dev;
	struct phonet_port *port = netdev_priv(dev);

	netif_carrier_off(dev);
	port->usb = NULL;

	usb_ep_disable(fp->out_ep);
	usb_ep_disable(fp->in_ep);
	if (fp->rx.skb) {
		dev_kfree_skb_irq(fp->rx.skb);
		fp->rx.skb = NULL;
	}
}

static int pn_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
{
	struct f_phonet *fp = func_to_pn(f);
	struct usb_gadget *gadget = fp->function.config->cdev->gadget;

	if (intf == pn_control_intf_desc.bInterfaceNumber)
		/* control interface, no altsetting */
		return (alt > 0) ? -EINVAL : 0;

	if (intf == pn_data_intf_desc.bInterfaceNumber) {
		struct net_device *dev = fp->dev;
		struct phonet_port *port = netdev_priv(dev);

		/* data intf (0: inactive, 1: active) */
		if (alt > 1)
			return -EINVAL;

		spin_lock(&port->lock);
		__pn_reset(f);
		if (alt == 1) {
			struct usb_endpoint_descriptor *out, *in;
			int i;

			out = ep_choose(gadget,
					&pn_hs_sink_desc,
					&pn_fs_sink_desc);
			in = ep_choose(gadget,
					&pn_hs_source_desc,
					&pn_fs_source_desc);
			usb_ep_enable(fp->out_ep, out);
			usb_ep_enable(fp->in_ep, in);

			port->usb = fp;
			fp->out_ep->driver_data = fp;
			fp->in_ep->driver_data = fp;

			netif_carrier_on(dev);
			for (i = 0; i < phonet_rxq_size; i++)
				pn_rx_submit(fp, fp->out_reqv[i], GFP_ATOMIC);
		}
		spin_unlock(&port->lock);
		return 0;
	}

	return -EINVAL;
}

static int pn_get_alt(struct usb_function *f, unsigned intf)
{
	struct f_phonet *fp = func_to_pn(f);

	if (intf == pn_control_intf_desc.bInterfaceNumber)
		return 0;

	if (intf == pn_data_intf_desc.bInterfaceNumber) {
		struct phonet_port *port = netdev_priv(fp->dev);
		u8 alt;

		spin_lock(&port->lock);
		alt = port->usb != NULL;
		spin_unlock(&port->lock);
		return alt;
	}

	return -EINVAL;
}

static void pn_disconnect(struct usb_function *f)
{
	struct f_phonet *fp = func_to_pn(f);
	struct phonet_port *port = netdev_priv(fp->dev);
	unsigned long flags;

	/* remain disabled until set_alt */
	spin_lock_irqsave(&port->lock, flags);
	__pn_reset(f);
	spin_unlock_irqrestore(&port->lock, flags);
}

/*-------------------------------------------------------------------------*/

static __init
int pn_bind(struct usb_configuration *c, struct usb_function *f)
{
	struct usb_composite_dev *cdev = c->cdev;
	struct usb_gadget *gadget = cdev->gadget;
	struct f_phonet *fp = func_to_pn(f);
	struct usb_ep *ep;
	int status, i;

	/* Reserve interface IDs */
	status = usb_interface_id(c, f);
	if (status < 0)
		goto err;
	pn_control_intf_desc.bInterfaceNumber = status;
	pn_union_desc.bMasterInterface0 = status;

	status = usb_interface_id(c, f);
	if (status < 0)
		goto err;
	pn_data_nop_intf_desc.bInterfaceNumber = status;
	pn_data_intf_desc.bInterfaceNumber = status;
	pn_union_desc.bSlaveInterface0 = status;

	/* Reserve endpoints */
	status = -ENODEV;
	ep = usb_ep_autoconfig(gadget, &pn_fs_sink_desc);
	if (!ep)
		goto err;
	fp->out_ep = ep;
	ep->driver_data = fp; /* Claim */

	ep = usb_ep_autoconfig(gadget, &pn_fs_source_desc);
	if (!ep)
		goto err;
	fp->in_ep = ep;
	ep->driver_data = fp; /* Claim */

	pn_hs_sink_desc.bEndpointAddress =
		pn_fs_sink_desc.bEndpointAddress;
	pn_hs_source_desc.bEndpointAddress =
		pn_fs_source_desc.bEndpointAddress;

	/* Do not try to bind Phonet twice... */
	fp->function.descriptors = fs_pn_function;
	fp->function.hs_descriptors = hs_pn_function;

	/* Incoming USB requests */
	status = -ENOMEM;
	for (i = 0; i < phonet_rxq_size; i++) {
		struct usb_request *req;

		req = usb_ep_alloc_request(fp->out_ep, GFP_KERNEL);
		if (!req)
			goto err;

		req->complete = pn_rx_complete;
		fp->out_reqv[i] = req;
	}

	/* Outgoing USB requests */
	fp->in_req = usb_ep_alloc_request(fp->in_ep, GFP_KERNEL);
	if (!fp->in_req)
		goto err;

	INFO(cdev, "USB CDC Phonet function\n");
	INFO(cdev, "using %s, OUT %s, IN %s\n", cdev->gadget->name,
		fp->out_ep->name, fp->in_ep->name);
	return 0;

err:
	if (fp->out_ep)
		fp->out_ep->driver_data = NULL;
	if (fp->in_ep)
		fp->in_ep->driver_data = NULL;
	ERROR(cdev, "USB CDC Phonet: cannot autoconfigure\n");
	return status;
}

static void
pn_unbind(struct usb_configuration *c, struct usb_function *f)
{
	struct f_phonet *fp = func_to_pn(f);
	int i;

	/* We are already disconnected */
	if (fp->in_req)
		usb_ep_free_request(fp->in_ep, fp->in_req);
	for (i = 0; i < phonet_rxq_size; i++)
		if (fp->out_reqv[i])
			usb_ep_free_request(fp->out_ep, fp->out_reqv[i]);

	kfree(fp);
}

/*-------------------------------------------------------------------------*/

static struct net_device *dev;

int __init phonet_bind_config(struct usb_configuration *c)
{
	struct f_phonet *fp;
	int err, size;

	size = sizeof(*fp) + (phonet_rxq_size * sizeof(struct usb_request *));
	fp = kzalloc(size, GFP_KERNEL);
	if (!fp)
		return -ENOMEM;

	fp->dev = dev;
	fp->function.name = "phonet";
	fp->function.bind = pn_bind;
	fp->function.unbind = pn_unbind;
	fp->function.set_alt = pn_set_alt;
	fp->function.get_alt = pn_get_alt;
	fp->function.disable = pn_disconnect;
	spin_lock_init(&fp->rx.lock);

	err = usb_add_function(c, &fp->function);
	if (err)
		kfree(fp);
	return err;
}

int __init gphonet_setup(struct usb_gadget *gadget)
{
	struct phonet_port *port;
	int err;

	/* Create net device */
	BUG_ON(dev);
	dev = alloc_netdev(sizeof(*port), "upnlink%d", pn_net_setup);
	if (!dev)
		return -ENOMEM;

	port = netdev_priv(dev);
	spin_lock_init(&port->lock);
	netif_carrier_off(dev);
	SET_NETDEV_DEV(dev, &gadget->dev);

	err = register_netdev(dev);
	if (err)
		free_netdev(dev);
	return err;
}

void gphonet_cleanup(void)
{
	unregister_netdev(dev);
}
Commit	Line	Data
9732d523 RDC	1	/*
	2	* f_phonet.c -- USB CDC Phonet function
	3	*
	4	* Copyright (C) 2007-2008 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
5a0e3ad6	23	#include <linux/slab.h>
9732d523 RDC	24	#include <linux/kernel.h>
	25	#include <linux/device.h>
	26
	27	#include <linux/netdevice.h>
	28	#include <linux/if_ether.h>
	29	#include <linux/if_phonet.h>
	30	#include <linux/if_arp.h>
	31
	32	#include <linux/usb/ch9.h>
	33	#include <linux/usb/cdc.h>
	34	#include <linux/usb/composite.h>
	35
	36	#include "u_phonet.h"
	37
	38	#define PN_MEDIA_USB 0x1B
b91cd144 RDC	39	#define MAXPACKET 512
	40	#if (PAGE_SIZE % MAXPACKET)
	41	#error MAXPACKET must divide PAGE_SIZE!
	42	#endif
9732d523 RDC	43
	44	/-------------------------------------------------------------------------/
	45
	46	struct phonet_port {
	47	struct f_phonet *usb;
	48	spinlock_t lock;
	49	};
	50
	51	struct f_phonet {
	52	struct usb_function function;
b91cd144 RDC	53	struct {
	54	struct sk_buff *skb;
	55	spinlock_t lock;
	56	} rx;
9732d523 RDC	57	struct net_device *dev;
	58	struct usb_ep in_ep, out_ep;
	59
	60	struct usb_request *in_req;
	61	struct usb_request *out_reqv[0];
	62	};
	63
b91cd144	64	static int phonet_rxq_size = 17;
9732d523 RDC	65
	66	static inline struct f_phonet func_to_pn(struct usb_function f)
	67	{
	68	return container_of(f, struct f_phonet, function);
	69	}
	70
	71	/-------------------------------------------------------------------------/
	72
	73	#define USB_CDC_SUBCLASS_PHONET 0xfe
	74	#define USB_CDC_PHONET_TYPE 0xab
	75
	76	static struct usb_interface_descriptor
	77	pn_control_intf_desc = {
	78	.bLength = sizeof pn_control_intf_desc,
	79	.bDescriptorType = USB_DT_INTERFACE,
	80
	81	/* .bInterfaceNumber = DYNAMIC, */
	82	.bInterfaceClass = USB_CLASS_COMM,
	83	.bInterfaceSubClass = USB_CDC_SUBCLASS_PHONET,
	84	};
	85
	86	static const struct usb_cdc_header_desc
	87	pn_header_desc = {
	88	.bLength = sizeof pn_header_desc,
	89	.bDescriptorType = USB_DT_CS_INTERFACE,
	90	.bDescriptorSubType = USB_CDC_HEADER_TYPE,
551509d2	91	.bcdCDC = cpu_to_le16(0x0110),
9732d523 RDC	92	};
	93
	94	static const struct usb_cdc_header_desc
	95	pn_phonet_desc = {
	96	.bLength = sizeof pn_phonet_desc,
	97	.bDescriptorType = USB_DT_CS_INTERFACE,
	98	.bDescriptorSubType = USB_CDC_PHONET_TYPE,
551509d2	99	.bcdCDC = cpu_to_le16(0x1505), /* ??? */
9732d523 RDC	100	};
	101
	102	static struct usb_cdc_union_desc
	103	pn_union_desc = {
	104	.bLength = sizeof pn_union_desc,
	105	.bDescriptorType = USB_DT_CS_INTERFACE,
	106	.bDescriptorSubType = USB_CDC_UNION_TYPE,
	107
	108	/* .bMasterInterface0 = DYNAMIC, */
	109	/* .bSlaveInterface0 = DYNAMIC, */
	110	};
	111
	112	static struct usb_interface_descriptor
	113	pn_data_nop_intf_desc = {
	114	.bLength = sizeof pn_data_nop_intf_desc,
	115	.bDescriptorType = USB_DT_INTERFACE,
	116
	117	/* .bInterfaceNumber = DYNAMIC, */
	118	.bAlternateSetting = 0,
	119	.bNumEndpoints = 0,
	120	.bInterfaceClass = USB_CLASS_CDC_DATA,
	121	};
	122
	123	static struct usb_interface_descriptor
	124	pn_data_intf_desc = {
	125	.bLength = sizeof pn_data_intf_desc,
	126	.bDescriptorType = USB_DT_INTERFACE,
	127
	128	/* .bInterfaceNumber = DYNAMIC, */
	129	.bAlternateSetting = 1,
	130	.bNumEndpoints = 2,
	131	.bInterfaceClass = USB_CLASS_CDC_DATA,
	132	};
	133
	134	static struct usb_endpoint_descriptor
	135	pn_fs_sink_desc = {
	136	.bLength = USB_DT_ENDPOINT_SIZE,
	137	.bDescriptorType = USB_DT_ENDPOINT,
	138
	139	.bEndpointAddress = USB_DIR_OUT,
	140	.bmAttributes = USB_ENDPOINT_XFER_BULK,
	141	};
	142
	143	static struct usb_endpoint_descriptor
	144	pn_hs_sink_desc = {
	145	.bLength = USB_DT_ENDPOINT_SIZE,
	146	.bDescriptorType = USB_DT_ENDPOINT,
	147
	148	.bEndpointAddress = USB_DIR_OUT,
	149	.bmAttributes = USB_ENDPOINT_XFER_BULK,
b91cd144	150	.wMaxPacketSize = cpu_to_le16(MAXPACKET),
9732d523 RDC	151	};
	152
	153	static struct usb_endpoint_descriptor
	154	pn_fs_source_desc = {
	155	.bLength = USB_DT_ENDPOINT_SIZE,
	156	.bDescriptorType = USB_DT_ENDPOINT,
	157
	158	.bEndpointAddress = USB_DIR_IN,
	159	.bmAttributes = USB_ENDPOINT_XFER_BULK,
	160	};
	161
	162	static struct usb_endpoint_descriptor
	163	pn_hs_source_desc = {
	164	.bLength = USB_DT_ENDPOINT_SIZE,
	165	.bDescriptorType = USB_DT_ENDPOINT,
	166
	167	.bEndpointAddress = USB_DIR_IN,
	168	.bmAttributes = USB_ENDPOINT_XFER_BULK,
551509d2	169	.wMaxPacketSize = cpu_to_le16(512),
9732d523 RDC	170	};
	171
	172	static struct usb_descriptor_header *fs_pn_function[] = {
	173	(struct usb_descriptor_header *) &pn_control_intf_desc,
	174	(struct usb_descriptor_header *) &pn_header_desc,
	175	(struct usb_descriptor_header *) &pn_phonet_desc,
	176	(struct usb_descriptor_header *) &pn_union_desc,
	177	(struct usb_descriptor_header *) &pn_data_nop_intf_desc,
	178	(struct usb_descriptor_header *) &pn_data_intf_desc,
	179	(struct usb_descriptor_header *) &pn_fs_sink_desc,
	180	(struct usb_descriptor_header *) &pn_fs_source_desc,
	181	NULL,
	182	};
	183
	184	static struct usb_descriptor_header *hs_pn_function[] = {
	185	(struct usb_descriptor_header *) &pn_control_intf_desc,
	186	(struct usb_descriptor_header *) &pn_header_desc,
	187	(struct usb_descriptor_header *) &pn_phonet_desc,
	188	(struct usb_descriptor_header *) &pn_union_desc,
	189	(struct usb_descriptor_header *) &pn_data_nop_intf_desc,
	190	(struct usb_descriptor_header *) &pn_data_intf_desc,
	191	(struct usb_descriptor_header *) &pn_hs_sink_desc,
	192	(struct usb_descriptor_header *) &pn_hs_source_desc,
	193	NULL,
	194	};
	195
	196	/-------------------------------------------------------------------------/
	197
	198	static int pn_net_open(struct net_device *dev)
	199	{
c69367fd	200	netif_wake_queue(dev);
9732d523 RDC	201	return 0;
	202	}
	203
	204	static int pn_net_close(struct net_device *dev)
	205	{
	206	netif_stop_queue(dev);
	207	return 0;
	208	}
	209
	210	static void pn_tx_complete(struct usb_ep ep, struct usb_request req)
	211	{
	212	struct f_phonet *fp = ep->driver_data;
	213	struct net_device *dev = fp->dev;
	214	struct sk_buff *skb = req->context;
	215
	216	switch (req->status) {
	217	case 0:
	218	dev->stats.tx_packets++;
	219	dev->stats.tx_bytes += skb->len;
	220	break;
	221
	222	case -ESHUTDOWN: /* disconnected */
	223	case -ECONNRESET: /* disabled */
	224	dev->stats.tx_aborted_errors++;
	225	default:
	226	dev->stats.tx_errors++;
	227	}
	228
	229	dev_kfree_skb_any(skb);
c69367fd	230	netif_wake_queue(dev);
9732d523 RDC	231	}
	232
	233	static int pn_net_xmit(struct sk_buff skb, struct net_device dev)
	234	{
	235	struct phonet_port *port = netdev_priv(dev);
	236	struct f_phonet *fp;
	237	struct usb_request *req;
	238	unsigned long flags;
	239
	240	if (skb->protocol != htons(ETH_P_PHONET))
	241	goto out;
	242
	243	spin_lock_irqsave(&port->lock, flags);
	244	fp = port->usb;
	245	if (unlikely(!fp)) /* race with carrier loss */
	246	goto out_unlock;
	247
	248	req = fp->in_req;
	249	req->buf = skb->data;
	250	req->length = skb->len;
	251	req->complete = pn_tx_complete;
	252	req->zero = 1;
	253	req->context = skb;
	254
	255	if (unlikely(usb_ep_queue(fp->in_ep, req, GFP_ATOMIC)))
	256	goto out_unlock;
	257
	258	netif_stop_queue(dev);
	259	skb = NULL;
	260
	261	out_unlock:
	262	spin_unlock_irqrestore(&port->lock, flags);
	263	out:
	264	if (unlikely(skb)) {
fa202592	265	dev_kfree_skb(skb);
9732d523 RDC	266	dev->stats.tx_dropped++;
9732d523 RDC	267	}
6ed10654	268	return NETDEV_TX_OK;
9732d523 RDC	269	}
	270
	271	static int pn_net_mtu(struct net_device *dev, int new_mtu)
	272	{
9732d523 RDC	273	if ((new_mtu < PHONET_MIN_MTU) \|\| (new_mtu > PHONET_MAX_MTU))
9732d523 RDC	274	return -EINVAL;
5da63cc4 RDC	275	dev->mtu = new_mtu;
5da63cc4 RDC	276	return 0;
9732d523 RDC	277	}
9732d523 RDC	278
ab638e69 SH	279	static const struct net_device_ops pn_netdev_ops = {
	280	.ndo_open = pn_net_open,
	281	.ndo_stop = pn_net_close,
	282	.ndo_start_xmit = pn_net_xmit,
	283	.ndo_change_mtu = pn_net_mtu,
	284	};
	285
9732d523 RDC	286	static void pn_net_setup(struct net_device *dev)
	287	{
	288	dev->features = 0;
	289	dev->type = ARPHRD_PHONET;
	290	dev->flags = IFF_POINTOPOINT \| IFF_NOARP;
	291	dev->mtu = PHONET_DEV_MTU;
	292	dev->hard_header_len = 1;
	293	dev->dev_addr[0] = PN_MEDIA_USB;
	294	dev->addr_len = 1;
	295	dev->tx_queue_len = 1;
	296
ab638e69	297	dev->netdev_ops = &pn_netdev_ops;
9732d523 RDC	298	dev->destructor = free_netdev;
9732d523 RDC	299	dev->header_ops = &phonet_header_ops;
9732d523 RDC	300	}
	301
	302	/-------------------------------------------------------------------------/
	303
	304	/*
	305	* Queue buffer for data from the host
	306	*/
	307	static int
	308	pn_rx_submit(struct f_phonet fp, struct usb_request req, gfp_t gfp_flags)
	309	{
b91cd144 RDC	310	struct net_device *dev = fp->dev;
b91cd144 RDC	311	struct page *page;
9732d523 RDC	312	int err;
9732d523 RDC	313
b91cd144 RDC	314	page = __netdev_alloc_page(dev, gfp_flags);
b91cd144 RDC	315	if (!page)
9732d523 RDC	316	return -ENOMEM;
9732d523 RDC	317
b91cd144 RDC	318	req->buf = page_address(page);
	319	req->length = PAGE_SIZE;
	320	req->context = page;
9732d523 RDC	321
	322	err = usb_ep_queue(fp->out_ep, req, gfp_flags);
	323	if (unlikely(err))
b91cd144	324	netdev_free_page(dev, page);
9732d523 RDC	325	return err;
	326	}
	327
	328	static void pn_rx_complete(struct usb_ep ep, struct usb_request req)
	329	{
	330	struct f_phonet *fp = ep->driver_data;
	331	struct net_device *dev = fp->dev;
b91cd144 RDC	332	struct page *page = req->context;
	333	struct sk_buff *skb;
	334	unsigned long flags;
9732d523 RDC	335	int status = req->status;
	336
	337	switch (status) {
	338	case 0:
b91cd144 RDC	339	spin_lock_irqsave(&fp->rx.lock, flags);
	340	skb = fp->rx.skb;
	341	if (!skb)
	342	skb = fp->rx.skb = netdev_alloc_skb(dev, 12);
	343	if (req->actual < req->length) /* Last fragment */
	344	fp->rx.skb = NULL;
	345	spin_unlock_irqrestore(&fp->rx.lock, flags);
	346
	347	if (unlikely(!skb))
9732d523	348	break;
b91cd144 RDC	349	skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, 0,
	350	req->actual);
	351	page = NULL;
	352
	353	if (req->actual < req->length) { /* Last fragment */
	354	skb->protocol = htons(ETH_P_PHONET);
	355	skb_reset_mac_header(skb);
	356	pskb_pull(skb, 1);
	357	skb->dev = dev;
	358	dev->stats.rx_packets++;
	359	dev->stats.rx_bytes += skb->len;
	360
	361	netif_rx(skb);
	362	}
9732d523 RDC	363	break;
	364
	365	/* Do not resubmit in these cases: */
	366	case -ESHUTDOWN: /* disconnect */
	367	case -ECONNABORTED: /* hw reset */
	368	case -ECONNRESET: /* dequeued (unlink or netif down) */
	369	req = NULL;
	370	break;
	371
	372	/* Do resubmit in these cases: */
	373	case -EOVERFLOW: /* request buffer overflow */
	374	dev->stats.rx_over_errors++;
	375	default:
	376	dev->stats.rx_errors++;
	377	break;
	378	}
	379
b91cd144 RDC	380	if (page)
b91cd144 RDC	381	netdev_free_page(dev, page);
9732d523 RDC	382	if (req)
	383	pn_rx_submit(fp, req, GFP_ATOMIC);
	384	}
	385
	386	/-------------------------------------------------------------------------/
	387
	388	static void __pn_reset(struct usb_function *f)
	389	{
	390	struct f_phonet *fp = func_to_pn(f);
	391	struct net_device *dev = fp->dev;
	392	struct phonet_port *port = netdev_priv(dev);
	393
	394	netif_carrier_off(dev);
9732d523 RDC	395	port->usb = NULL;
	396
	397	usb_ep_disable(fp->out_ep);
	398	usb_ep_disable(fp->in_ep);
b91cd144 RDC	399	if (fp->rx.skb) {
	400	dev_kfree_skb_irq(fp->rx.skb);
	401	fp->rx.skb = NULL;
	402	}
9732d523 RDC	403	}
	404
	405	static int pn_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
	406	{
	407	struct f_phonet *fp = func_to_pn(f);
	408	struct usb_gadget *gadget = fp->function.config->cdev->gadget;
	409
	410	if (intf == pn_control_intf_desc.bInterfaceNumber)
	411	/* control interface, no altsetting */
	412	return (alt > 0) ? -EINVAL : 0;
	413
	414	if (intf == pn_data_intf_desc.bInterfaceNumber) {
	415	struct net_device *dev = fp->dev;
	416	struct phonet_port *port = netdev_priv(dev);
	417
	418	/* data intf (0: inactive, 1: active) */
	419	if (alt > 1)
	420	return -EINVAL;
	421
	422	spin_lock(&port->lock);
	423	__pn_reset(f);
	424	if (alt == 1) {
	425	struct usb_endpoint_descriptor out, in;
	426	int i;
	427
	428	out = ep_choose(gadget,
	429	&pn_hs_sink_desc,
	430	&pn_fs_sink_desc);
	431	in = ep_choose(gadget,
	432	&pn_hs_source_desc,
	433	&pn_fs_source_desc);
	434	usb_ep_enable(fp->out_ep, out);
	435	usb_ep_enable(fp->in_ep, in);
	436
	437	port->usb = fp;
	438	fp->out_ep->driver_data = fp;
	439	fp->in_ep->driver_data = fp;
	440
	441	netif_carrier_on(dev);
9732d523 RDC	442	for (i = 0; i < phonet_rxq_size; i++)
	443	pn_rx_submit(fp, fp->out_reqv[i], GFP_ATOMIC);
	444	}
	445	spin_unlock(&port->lock);
	446	return 0;
	447	}
	448
	449	return -EINVAL;
	450	}
	451
	452	static int pn_get_alt(struct usb_function *f, unsigned intf)
	453	{
	454	struct f_phonet *fp = func_to_pn(f);
	455
	456	if (intf == pn_control_intf_desc.bInterfaceNumber)
	457	return 0;
	458
	459	if (intf == pn_data_intf_desc.bInterfaceNumber) {
	460	struct phonet_port *port = netdev_priv(fp->dev);
	461	u8 alt;
	462
	463	spin_lock(&port->lock);
	464	alt = port->usb != NULL;
	465	spin_unlock(&port->lock);
	466	return alt;
	467	}
	468
	469	return -EINVAL;
	470	}
	471
	472	static void pn_disconnect(struct usb_function *f)
	473	{
	474	struct f_phonet *fp = func_to_pn(f);
	475	struct phonet_port *port = netdev_priv(fp->dev);
	476	unsigned long flags;
	477
	478	/* remain disabled until set_alt */
	479	spin_lock_irqsave(&port->lock, flags);
	480	__pn_reset(f);
	481	spin_unlock_irqrestore(&port->lock, flags);
	482	}
	483
	484	/-------------------------------------------------------------------------/
	485
	486	static __init
	487	int pn_bind(struct usb_configuration c, struct usb_function f)
	488	{
	489	struct usb_composite_dev *cdev = c->cdev;
	490	struct usb_gadget *gadget = cdev->gadget;
	491	struct f_phonet *fp = func_to_pn(f);
	492	struct usb_ep *ep;
	493	int status, i;
	494
	495	/* Reserve interface IDs */
	496	status = usb_interface_id(c, f);
	497	if (status < 0)
	498	goto err;
	499	pn_control_intf_desc.bInterfaceNumber = status;
	500	pn_union_desc.bMasterInterface0 = status;
	501
	502	status = usb_interface_id(c, f);
	503	if (status < 0)
	504	goto err;
	505	pn_data_nop_intf_desc.bInterfaceNumber = status;
506	pn_data_intf_desc.bInterfaceNumber = status;
507	pn_union_desc.bSlaveInterface0 = status;
508
509	/* Reserve endpoints */
510	status = -ENODEV;
511	ep = usb_ep_autoconfig(gadget, &pn_fs_sink_desc);
512	if (!ep)
513	goto err;
514	fp->out_ep = ep;
515	ep->driver_data = fp; /* Claim */
516
517	ep = usb_ep_autoconfig(gadget, &pn_fs_source_desc);
518	if (!ep)
519	goto err;
520	fp->in_ep = ep;
521	ep->driver_data = fp; /* Claim */
522
523	pn_hs_sink_desc.bEndpointAddress =
524	pn_fs_sink_desc.bEndpointAddress;
525	pn_hs_source_desc.bEndpointAddress =
526	pn_fs_source_desc.bEndpointAddress;
527
528	/* Do not try to bind Phonet twice... */
529	fp->function.descriptors = fs_pn_function;
530	fp->function.hs_descriptors = hs_pn_function;
531
532	/* Incoming USB requests */
533	status = -ENOMEM;
534	for (i = 0; i < phonet_rxq_size; i++) {
535	struct usb_request *req;
536
537	req = usb_ep_alloc_request(fp->out_ep, GFP_KERNEL);
538	if (!req)
539	goto err;
540
541	req->complete = pn_rx_complete;
542	fp->out_reqv[i] = req;
543	}
544
545	/* Outgoing USB requests */
546	fp->in_req = usb_ep_alloc_request(fp->in_ep, GFP_KERNEL);
547	if (!fp->in_req)
548	goto err;
549
550	INFO(cdev, "USB CDC Phonet function\n");
551	INFO(cdev, "using %s, OUT %s, IN %s\n", cdev->gadget->name,
552	fp->out_ep->name, fp->in_ep->name);
553	return 0;
554
555	err:
556	if (fp->out_ep)
557	fp->out_ep->driver_data = NULL;
558	if (fp->in_ep)
559	fp->in_ep->driver_data = NULL;
560	ERROR(cdev, "USB CDC Phonet: cannot autoconfigure\n");
561	return status;
562	}
563
564	static void
565	pn_unbind(struct usb_configuration c, struct usb_function f)
566	{
567	struct f_phonet *fp = func_to_pn(f);
568	int i;
569
570	/* We are already disconnected */
571	if (fp->in_req)
572	usb_ep_free_request(fp->in_ep, fp->in_req);
573	for (i = 0; i < phonet_rxq_size; i++)
574	if (fp->out_reqv[i])
575	usb_ep_free_request(fp->out_ep, fp->out_reqv[i]);
576
577	kfree(fp);
578	}
579
580	/-------------------------------------------------------------------------/
581
582	static struct net_device *dev;
583
584	int __init phonet_bind_config(struct usb_configuration *c)
585	{
586	struct f_phonet *fp;
b61b8af0	587	int err, size;
9732d523	588
b61b8af0 RDC	589	size = sizeof(fp) + (phonet_rxq_size sizeof(struct usb_request *));
b61b8af0 RDC	590	fp = kzalloc(size, GFP_KERNEL);
9732d523 RDC	591	if (!fp)
	592	return -ENOMEM;
	593
	594	fp->dev = dev;
	595	fp->function.name = "phonet";
	596	fp->function.bind = pn_bind;
	597	fp->function.unbind = pn_unbind;
	598	fp->function.set_alt = pn_set_alt;
	599	fp->function.get_alt = pn_get_alt;
	600	fp->function.disable = pn_disconnect;
b91cd144	601	spin_lock_init(&fp->rx.lock);
9732d523 RDC	602
	603	err = usb_add_function(c, &fp->function);
	604	if (err)
	605	kfree(fp);
	606	return err;
	607	}
	608
	609	int __init gphonet_setup(struct usb_gadget *gadget)
	610	{
	611	struct phonet_port *port;
	612	int err;
	613
	614	/* Create net device */
	615	BUG_ON(dev);
b61b8af0	616	dev = alloc_netdev(sizeof(*port), "upnlink%d", pn_net_setup);
9732d523 RDC	617	if (!dev)
	618	return -ENOMEM;
	619
	620	port = netdev_priv(dev);
	621	spin_lock_init(&port->lock);
	622	netif_carrier_off(dev);
9732d523 RDC	623	SET_NETDEV_DEV(dev, &gadget->dev);
	624
	625	err = register_netdev(dev);
	626	if (err)
	627	free_netdev(dev);
	628	return err;
	629	}
	630
	631	void gphonet_cleanup(void)
	632	{
	633	unregister_netdev(dev);
	634	}