[deliverable/linux.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.
 */

#include <linux/mm.h>
#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 page *page;
	int err;

	page = __skb_alloc_page(gfp_flags | __GFP_NOMEMALLOC, NULL);
	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))
		put_page(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;

		if (skb->len == 0) { /* First fragment */
			skb->protocol = htons(ETH_P_PHONET);
			skb_reset_mac_header(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,
				skb->len <= 1, req->actual, PAGE_SIZE);
		page = NULL;

		if (req->actual < req->length) { /* Last fragment */
			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)
		put_page(page);
	if (req)
		pn_rx_submit(fp, req, GFP_ATOMIC | __GFP_COLD);
}

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

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) {
			int i;

			if (config_ep_by_speed(gadget, f, fp->in_ep) ||
			    config_ep_by_speed(gadget, f, fp->out_ep)) {
				fp->in_ep->desc = NULL;
				fp->out_ep->desc = NULL;
				spin_unlock(&port->lock);
				return -EINVAL;
			}
			usb_ep_enable(fp->out_ep);
			usb_ep_enable(fp->in_ep);

			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 | __GFP_COLD);
		}
		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... */
	status = usb_assign_descriptors(f, fs_pn_function, hs_pn_function,
			NULL);
	if (status)
		goto err;

	/* 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;

		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_req;

	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_req:
	for (i = 0; i < phonet_rxq_size && fp->out_reqv[i]; i++)
		usb_ep_free_request(fp->out_ep, fp->out_reqv[i]);
err:
	usb_free_all_descriptors(f);
	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]);

	usb_free_all_descriptors(f);
	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.
9732d523 RDC	11	*/
9732d523 RDC	12
b7f080cf	13	#include <linux/mm.h>
5a0e3ad6	14	#include <linux/slab.h>
9732d523 RDC	15	#include <linux/kernel.h>
	16	#include <linux/device.h>
	17
	18	#include <linux/netdevice.h>
	19	#include <linux/if_ether.h>
	20	#include <linux/if_phonet.h>
	21	#include <linux/if_arp.h>
	22
	23	#include <linux/usb/ch9.h>
	24	#include <linux/usb/cdc.h>
	25	#include <linux/usb/composite.h>
	26
	27	#include "u_phonet.h"
	28
	29	#define PN_MEDIA_USB 0x1B
b91cd144 RDC	30	#define MAXPACKET 512
	31	#if (PAGE_SIZE % MAXPACKET)
	32	#error MAXPACKET must divide PAGE_SIZE!
	33	#endif
9732d523 RDC	34
	35	/-------------------------------------------------------------------------/
	36
	37	struct phonet_port {
	38	struct f_phonet *usb;
	39	spinlock_t lock;
	40	};
	41
	42	struct f_phonet {
	43	struct usb_function function;
b91cd144 RDC	44	struct {
	45	struct sk_buff *skb;
	46	spinlock_t lock;
	47	} rx;
9732d523 RDC	48	struct net_device *dev;
	49	struct usb_ep in_ep, out_ep;
	50
	51	struct usb_request *in_req;
	52	struct usb_request *out_reqv[0];
	53	};
	54
b91cd144	55	static int phonet_rxq_size = 17;
9732d523 RDC	56
	57	static inline struct f_phonet func_to_pn(struct usb_function f)
	58	{
	59	return container_of(f, struct f_phonet, function);
	60	}
	61
	62	/-------------------------------------------------------------------------/
	63
	64	#define USB_CDC_SUBCLASS_PHONET 0xfe
	65	#define USB_CDC_PHONET_TYPE 0xab
	66
	67	static struct usb_interface_descriptor
	68	pn_control_intf_desc = {
	69	.bLength = sizeof pn_control_intf_desc,
	70	.bDescriptorType = USB_DT_INTERFACE,
	71
	72	/* .bInterfaceNumber = DYNAMIC, */
	73	.bInterfaceClass = USB_CLASS_COMM,
	74	.bInterfaceSubClass = USB_CDC_SUBCLASS_PHONET,
	75	};
	76
	77	static const struct usb_cdc_header_desc
	78	pn_header_desc = {
	79	.bLength = sizeof pn_header_desc,
	80	.bDescriptorType = USB_DT_CS_INTERFACE,
	81	.bDescriptorSubType = USB_CDC_HEADER_TYPE,
551509d2	82	.bcdCDC = cpu_to_le16(0x0110),
9732d523 RDC	83	};
	84
	85	static const struct usb_cdc_header_desc
	86	pn_phonet_desc = {
	87	.bLength = sizeof pn_phonet_desc,
	88	.bDescriptorType = USB_DT_CS_INTERFACE,
	89	.bDescriptorSubType = USB_CDC_PHONET_TYPE,
551509d2	90	.bcdCDC = cpu_to_le16(0x1505), /* ??? */
9732d523 RDC	91	};
	92
	93	static struct usb_cdc_union_desc
	94	pn_union_desc = {
	95	.bLength = sizeof pn_union_desc,
	96	.bDescriptorType = USB_DT_CS_INTERFACE,
	97	.bDescriptorSubType = USB_CDC_UNION_TYPE,
	98
	99	/* .bMasterInterface0 = DYNAMIC, */
	100	/* .bSlaveInterface0 = DYNAMIC, */
	101	};
	102
	103	static struct usb_interface_descriptor
	104	pn_data_nop_intf_desc = {
	105	.bLength = sizeof pn_data_nop_intf_desc,
	106	.bDescriptorType = USB_DT_INTERFACE,
	107
	108	/* .bInterfaceNumber = DYNAMIC, */
	109	.bAlternateSetting = 0,
	110	.bNumEndpoints = 0,
	111	.bInterfaceClass = USB_CLASS_CDC_DATA,
	112	};
	113
	114	static struct usb_interface_descriptor
	115	pn_data_intf_desc = {
	116	.bLength = sizeof pn_data_intf_desc,
	117	.bDescriptorType = USB_DT_INTERFACE,
	118
	119	/* .bInterfaceNumber = DYNAMIC, */
	120	.bAlternateSetting = 1,
	121	.bNumEndpoints = 2,
	122	.bInterfaceClass = USB_CLASS_CDC_DATA,
	123	};
	124
	125	static struct usb_endpoint_descriptor
	126	pn_fs_sink_desc = {
	127	.bLength = USB_DT_ENDPOINT_SIZE,
	128	.bDescriptorType = USB_DT_ENDPOINT,
	129
	130	.bEndpointAddress = USB_DIR_OUT,
	131	.bmAttributes = USB_ENDPOINT_XFER_BULK,
	132	};
	133
	134	static struct usb_endpoint_descriptor
	135	pn_hs_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,
b91cd144	141	.wMaxPacketSize = cpu_to_le16(MAXPACKET),
9732d523 RDC	142	};
	143
	144	static struct usb_endpoint_descriptor
	145	pn_fs_source_desc = {
	146	.bLength = USB_DT_ENDPOINT_SIZE,
	147	.bDescriptorType = USB_DT_ENDPOINT,
	148
	149	.bEndpointAddress = USB_DIR_IN,
	150	.bmAttributes = USB_ENDPOINT_XFER_BULK,
	151	};
	152
	153	static struct usb_endpoint_descriptor
	154	pn_hs_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,
551509d2	160	.wMaxPacketSize = cpu_to_le16(512),
9732d523 RDC	161	};
	162
	163	static struct usb_descriptor_header *fs_pn_function[] = {
	164	(struct usb_descriptor_header *) &pn_control_intf_desc,
	165	(struct usb_descriptor_header *) &pn_header_desc,
	166	(struct usb_descriptor_header *) &pn_phonet_desc,
	167	(struct usb_descriptor_header *) &pn_union_desc,
	168	(struct usb_descriptor_header *) &pn_data_nop_intf_desc,
	169	(struct usb_descriptor_header *) &pn_data_intf_desc,
	170	(struct usb_descriptor_header *) &pn_fs_sink_desc,
	171	(struct usb_descriptor_header *) &pn_fs_source_desc,
	172	NULL,
	173	};
	174
	175	static struct usb_descriptor_header *hs_pn_function[] = {
	176	(struct usb_descriptor_header *) &pn_control_intf_desc,
	177	(struct usb_descriptor_header *) &pn_header_desc,
	178	(struct usb_descriptor_header *) &pn_phonet_desc,
	179	(struct usb_descriptor_header *) &pn_union_desc,
	180	(struct usb_descriptor_header *) &pn_data_nop_intf_desc,
	181	(struct usb_descriptor_header *) &pn_data_intf_desc,
	182	(struct usb_descriptor_header *) &pn_hs_sink_desc,
	183	(struct usb_descriptor_header *) &pn_hs_source_desc,
	184	NULL,
	185	};
	186
	187	/-------------------------------------------------------------------------/
	188
	189	static int pn_net_open(struct net_device *dev)
	190	{
c69367fd	191	netif_wake_queue(dev);
9732d523 RDC	192	return 0;
	193	}
	194
	195	static int pn_net_close(struct net_device *dev)
	196	{
	197	netif_stop_queue(dev);
	198	return 0;
	199	}
	200
	201	static void pn_tx_complete(struct usb_ep ep, struct usb_request req)
	202	{
	203	struct f_phonet *fp = ep->driver_data;
	204	struct net_device *dev = fp->dev;
	205	struct sk_buff *skb = req->context;
	206
	207	switch (req->status) {
	208	case 0:
	209	dev->stats.tx_packets++;
	210	dev->stats.tx_bytes += skb->len;
	211	break;
	212
	213	case -ESHUTDOWN: /* disconnected */
	214	case -ECONNRESET: /* disabled */
	215	dev->stats.tx_aborted_errors++;
	216	default:
	217	dev->stats.tx_errors++;
	218	}
	219
	220	dev_kfree_skb_any(skb);
c69367fd	221	netif_wake_queue(dev);
9732d523 RDC	222	}
	223
	224	static int pn_net_xmit(struct sk_buff skb, struct net_device dev)
	225	{
	226	struct phonet_port *port = netdev_priv(dev);
	227	struct f_phonet *fp;
	228	struct usb_request *req;
	229	unsigned long flags;
	230
	231	if (skb->protocol != htons(ETH_P_PHONET))
	232	goto out;
	233
	234	spin_lock_irqsave(&port->lock, flags);
	235	fp = port->usb;
	236	if (unlikely(!fp)) /* race with carrier loss */
	237	goto out_unlock;
	238
	239	req = fp->in_req;
	240	req->buf = skb->data;
	241	req->length = skb->len;
	242	req->complete = pn_tx_complete;
	243	req->zero = 1;
	244	req->context = skb;
	245
	246	if (unlikely(usb_ep_queue(fp->in_ep, req, GFP_ATOMIC)))
	247	goto out_unlock;
	248
	249	netif_stop_queue(dev);
	250	skb = NULL;
	251
	252	out_unlock:
	253	spin_unlock_irqrestore(&port->lock, flags);
	254	out:
	255	if (unlikely(skb)) {
fa202592	256	dev_kfree_skb(skb);
9732d523 RDC	257	dev->stats.tx_dropped++;
9732d523 RDC	258	}
6ed10654	259	return NETDEV_TX_OK;
9732d523 RDC	260	}
	261
	262	static int pn_net_mtu(struct net_device *dev, int new_mtu)
	263	{
9732d523 RDC	264	if ((new_mtu < PHONET_MIN_MTU) \|\| (new_mtu > PHONET_MAX_MTU))
9732d523 RDC	265	return -EINVAL;
5da63cc4 RDC	266	dev->mtu = new_mtu;
5da63cc4 RDC	267	return 0;
9732d523 RDC	268	}
9732d523 RDC	269
ab638e69 SH	270	static const struct net_device_ops pn_netdev_ops = {
	271	.ndo_open = pn_net_open,
	272	.ndo_stop = pn_net_close,
	273	.ndo_start_xmit = pn_net_xmit,
	274	.ndo_change_mtu = pn_net_mtu,
	275	};
	276
9732d523 RDC	277	static void pn_net_setup(struct net_device *dev)
	278	{
	279	dev->features = 0;
	280	dev->type = ARPHRD_PHONET;
	281	dev->flags = IFF_POINTOPOINT \| IFF_NOARP;
	282	dev->mtu = PHONET_DEV_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 = 1;
	287
ab638e69	288	dev->netdev_ops = &pn_netdev_ops;
9732d523 RDC	289	dev->destructor = free_netdev;
9732d523 RDC	290	dev->header_ops = &phonet_header_ops;
9732d523 RDC	291	}
	292
	293	/-------------------------------------------------------------------------/
	294
	295	/*
	296	* Queue buffer for data from the host
	297	*/
	298	static int
	299	pn_rx_submit(struct f_phonet fp, struct usb_request req, gfp_t gfp_flags)
	300	{
b91cd144	301	struct page *page;
9732d523 RDC	302	int err;
9732d523 RDC	303
0614002b	304	page = __skb_alloc_page(gfp_flags \| __GFP_NOMEMALLOC, NULL);
b91cd144	305	if (!page)
9732d523 RDC	306	return -ENOMEM;
9732d523 RDC	307
b91cd144 RDC	308	req->buf = page_address(page);
	309	req->length = PAGE_SIZE;
	310	req->context = page;
9732d523 RDC	311
	312	err = usb_ep_queue(fp->out_ep, req, gfp_flags);
	313	if (unlikely(err))
1f2149c1	314	put_page(page);
9732d523 RDC	315	return err;
	316	}
	317
	318	static void pn_rx_complete(struct usb_ep ep, struct usb_request req)
	319	{
	320	struct f_phonet *fp = ep->driver_data;
	321	struct net_device *dev = fp->dev;
b91cd144 RDC	322	struct page *page = req->context;
	323	struct sk_buff *skb;
	324	unsigned long flags;
9732d523 RDC	325	int status = req->status;
	326
	327	switch (status) {
	328	case 0:
b91cd144 RDC	329	spin_lock_irqsave(&fp->rx.lock, flags);
	330	skb = fp->rx.skb;
	331	if (!skb)
	332	skb = fp->rx.skb = netdev_alloc_skb(dev, 12);
	333	if (req->actual < req->length) /* Last fragment */
	334	fp->rx.skb = NULL;
	335	spin_unlock_irqrestore(&fp->rx.lock, flags);
	336
	337	if (unlikely(!skb))
9732d523	338	break;
b91cd144	339
f5a45325	340	if (skb->len == 0) { /* First fragment */
b91cd144 RDC	341	skb->protocol = htons(ETH_P_PHONET);
b91cd144 RDC	342	skb_reset_mac_header(skb);
f5a45325 RDC	343	/* Can't use pskb_pull() on page in IRQ */
	344	memcpy(skb_put(skb, 1), page_address(page), 1);
	345	}
	346
	347	skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
21dcda60	348	skb->len <= 1, req->actual, PAGE_SIZE);
f5a45325 RDC	349	page = NULL;
	350
	351	if (req->actual < req->length) { /* Last fragment */
b91cd144 RDC	352	skb->dev = dev;
	353	dev->stats.rx_packets++;
	354	dev->stats.rx_bytes += skb->len;
	355
	356	netif_rx(skb);
	357	}
9732d523 RDC	358	break;
	359
	360	/* Do not resubmit in these cases: */
	361	case -ESHUTDOWN: /* disconnect */
	362	case -ECONNABORTED: /* hw reset */
	363	case -ECONNRESET: /* dequeued (unlink or netif down) */
	364	req = NULL;
	365	break;
	366
	367	/* Do resubmit in these cases: */
	368	case -EOVERFLOW: /* request buffer overflow */
	369	dev->stats.rx_over_errors++;
	370	default:
	371	dev->stats.rx_errors++;
	372	break;
	373	}
	374
b91cd144	375	if (page)
1f2149c1	376	put_page(page);
9732d523	377	if (req)
1f2149c1	378	pn_rx_submit(fp, req, GFP_ATOMIC \| __GFP_COLD);
9732d523 RDC	379	}
	380
	381	/-------------------------------------------------------------------------/
	382
	383	static void __pn_reset(struct usb_function *f)
	384	{
	385	struct f_phonet *fp = func_to_pn(f);
	386	struct net_device *dev = fp->dev;
	387	struct phonet_port *port = netdev_priv(dev);
	388
	389	netif_carrier_off(dev);
9732d523 RDC	390	port->usb = NULL;
	391
	392	usb_ep_disable(fp->out_ep);
	393	usb_ep_disable(fp->in_ep);
b91cd144 RDC	394	if (fp->rx.skb) {
	395	dev_kfree_skb_irq(fp->rx.skb);
	396	fp->rx.skb = NULL;
	397	}
9732d523 RDC	398	}
	399
	400	static int pn_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
	401	{
	402	struct f_phonet *fp = func_to_pn(f);
	403	struct usb_gadget *gadget = fp->function.config->cdev->gadget;
	404
	405	if (intf == pn_control_intf_desc.bInterfaceNumber)
	406	/* control interface, no altsetting */
	407	return (alt > 0) ? -EINVAL : 0;
	408
	409	if (intf == pn_data_intf_desc.bInterfaceNumber) {
	410	struct net_device *dev = fp->dev;
	411	struct phonet_port *port = netdev_priv(dev);
	412
	413	/* data intf (0: inactive, 1: active) */
	414	if (alt > 1)
	415	return -EINVAL;
	416
	417	spin_lock(&port->lock);
	418	__pn_reset(f);
	419	if (alt == 1) {
9732d523 RDC	420	int i;
9732d523 RDC	421
ea2a1df7 TB	422	if (config_ep_by_speed(gadget, f, fp->in_ep) \|\|
	423	config_ep_by_speed(gadget, f, fp->out_ep)) {
	424	fp->in_ep->desc = NULL;
	425	fp->out_ep->desc = NULL;
bb8070c2	426	spin_unlock(&port->lock);
ea2a1df7 TB	427	return -EINVAL;
ea2a1df7 TB	428	}
72c973dd TB	429	usb_ep_enable(fp->out_ep);
72c973dd TB	430	usb_ep_enable(fp->in_ep);
9732d523 RDC	431
	432	port->usb = fp;
	433	fp->out_ep->driver_data = fp;
	434	fp->in_ep->driver_data = fp;
	435
	436	netif_carrier_on(dev);
9732d523	437	for (i = 0; i < phonet_rxq_size; i++)
1f2149c1	438	pn_rx_submit(fp, fp->out_reqv[i], GFP_ATOMIC \| __GFP_COLD);
9732d523 RDC	439	}
	440	spin_unlock(&port->lock);
	441	return 0;
	442	}
	443
	444	return -EINVAL;
	445	}
	446
	447	static int pn_get_alt(struct usb_function *f, unsigned intf)
	448	{
	449	struct f_phonet *fp = func_to_pn(f);
	450
	451	if (intf == pn_control_intf_desc.bInterfaceNumber)
	452	return 0;
	453
	454	if (intf == pn_data_intf_desc.bInterfaceNumber) {
	455	struct phonet_port *port = netdev_priv(fp->dev);
	456	u8 alt;
	457
	458	spin_lock(&port->lock);
	459	alt = port->usb != NULL;
	460	spin_unlock(&port->lock);
	461	return alt;
	462	}
	463
	464	return -EINVAL;
	465	}
	466
	467	static void pn_disconnect(struct usb_function *f)
	468	{
	469	struct f_phonet *fp = func_to_pn(f);
	470	struct phonet_port *port = netdev_priv(fp->dev);
	471	unsigned long flags;
	472
	473	/* remain disabled until set_alt */
	474	spin_lock_irqsave(&port->lock, flags);
	475	__pn_reset(f);
	476	spin_unlock_irqrestore(&port->lock, flags);
	477	}
	478
	479	/-------------------------------------------------------------------------/
	480
	481	static __init
	482	int pn_bind(struct usb_configuration c, struct usb_function f)
	483	{
	484	struct usb_composite_dev *cdev = c->cdev;
	485	struct usb_gadget *gadget = cdev->gadget;
	486	struct f_phonet *fp = func_to_pn(f);
	487	struct usb_ep *ep;
	488	int status, i;
	489
	490	/* Reserve interface IDs */
	491	status = usb_interface_id(c, f);
	492	if (status < 0)
	493	goto err;
	494	pn_control_intf_desc.bInterfaceNumber = status;
	495	pn_union_desc.bMasterInterface0 = status;
	496
	497	status = usb_interface_id(c, f);
	498	if (status < 0)
	499	goto err;
	500	pn_data_nop_intf_desc.bInterfaceNumber = status;
	501	pn_data_intf_desc.bInterfaceNumber = status;
	502	pn_union_desc.bSlaveInterface0 = status;
503
504	/* Reserve endpoints */
505	status = -ENODEV;
506	ep = usb_ep_autoconfig(gadget, &pn_fs_sink_desc);
507	if (!ep)
508	goto err;
509	fp->out_ep = ep;
510	ep->driver_data = fp; /* Claim */
511
512	ep = usb_ep_autoconfig(gadget, &pn_fs_source_desc);
513	if (!ep)
514	goto err;
515	fp->in_ep = ep;
516	ep->driver_data = fp; /* Claim */
517
10287bae SAS	518	pn_hs_sink_desc.bEndpointAddress = pn_fs_sink_desc.bEndpointAddress;
10287bae SAS	519	pn_hs_source_desc.bEndpointAddress = pn_fs_source_desc.bEndpointAddress;
9732d523 RDC	520
9732d523 RDC	521	/* Do not try to bind Phonet twice... */
10287bae SAS	522	status = usb_assign_descriptors(f, fs_pn_function, hs_pn_function,
	523	NULL);
	524	if (status)
	525	goto err;
9732d523 RDC	526
	527	/* Incoming USB requests */
	528	status = -ENOMEM;
	529	for (i = 0; i < phonet_rxq_size; i++) {
	530	struct usb_request *req;
	531
	532	req = usb_ep_alloc_request(fp->out_ep, GFP_KERNEL);
	533	if (!req)
d0eca719	534	goto err_req;
9732d523 RDC	535
	536	req->complete = pn_rx_complete;
	537	fp->out_reqv[i] = req;
	538	}
	539
	540	/* Outgoing USB requests */
	541	fp->in_req = usb_ep_alloc_request(fp->in_ep, GFP_KERNEL);
	542	if (!fp->in_req)
d0eca719	543	goto err_req;
9732d523 RDC	544
	545	INFO(cdev, "USB CDC Phonet function\n");
	546	INFO(cdev, "using %s, OUT %s, IN %s\n", cdev->gadget->name,
	547	fp->out_ep->name, fp->in_ep->name);
	548	return 0;
	549
d0eca719 SAS	550	err_req:
	551	for (i = 0; i < phonet_rxq_size && fp->out_reqv[i]; i++)
	552	usb_ep_free_request(fp->out_ep, fp->out_reqv[i]);
9732d523	553	err:
10287bae	554	usb_free_all_descriptors(f);
9732d523 RDC	555	if (fp->out_ep)
	556	fp->out_ep->driver_data = NULL;
	557	if (fp->in_ep)
	558	fp->in_ep->driver_data = NULL;
	559	ERROR(cdev, "USB CDC Phonet: cannot autoconfigure\n");
	560	return status;
	561	}
	562
	563	static void
	564	pn_unbind(struct usb_configuration c, struct usb_function f)
	565	{
	566	struct f_phonet *fp = func_to_pn(f);
	567	int i;
	568
	569	/* We are already disconnected */
	570	if (fp->in_req)
	571	usb_ep_free_request(fp->in_ep, fp->in_req);
	572	for (i = 0; i < phonet_rxq_size; i++)
	573	if (fp->out_reqv[i])
	574	usb_ep_free_request(fp->out_ep, fp->out_reqv[i]);
	575
10287bae	576	usb_free_all_descriptors(f);
9732d523 RDC	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	}