440 строки
10 KiB
C
440 строки
10 KiB
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/mm.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);
|
||
int status = req->status;
|
||
|
||
switch (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", 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 = __dev_alloc_page(gfp_flags | __GFP_NOMEMALLOC);
|
||
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);
|
||
put_page(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;
|
||
int status = req->status;
|
||
|
||
switch (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 */
|
||
skb_put_data(skb, page_address(page), 1);
|
||
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
|
||
page, 1, req->actual_length,
|
||
PAGE_SIZE);
|
||
page = NULL;
|
||
}
|
||
} else {
|
||
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
|
||
page, 0, req->actual_length,
|
||
PAGE_SIZE);
|
||
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)
|
||
put_page(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)) {
|
||
usb_free_urb(req);
|
||
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 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,
|
||
};
|
||
|
||
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->min_mtu = PHONET_MIN_MTU;
|
||
dev->max_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->needs_free_netdev = true;
|
||
}
|
||
|
||
/*
|
||
* USB driver callbacks
|
||
*/
|
||
static const 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;
|
||
|
||
static 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_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 phonet = 0;
|
||
int len, err;
|
||
struct usb_cdc_parsed_header hdr;
|
||
|
||
data = intf->altsetting->extra;
|
||
len = intf->altsetting->extralen;
|
||
cdc_parse_cdc_header(&hdr, intf, data, len);
|
||
union_header = hdr.usb_cdc_union_desc;
|
||
phonet = hdr.phonet_magic_present;
|
||
|
||
if (!union_header || !phonet)
|
||
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, NET_NAME_UNKNOWN, usbpn_setup);
|
||
if (!dev)
|
||
return -ENOMEM;
|
||
|
||
pnd = netdev_priv(dev);
|
||
SET_NETDEV_DEV(dev, &intf->dev);
|
||
|
||
pnd->dev = dev;
|
||
pnd->usb = 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);
|
||
|
||
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);
|
||
}
|
||
|
||
static struct usb_driver usbpn_driver = {
|
||
.name = "cdc_phonet",
|
||
.probe = usbpn_probe,
|
||
.disconnect = usbpn_disconnect,
|
||
.id_table = usbpn_ids,
|
||
.disable_hub_initiated_lpm = 1,
|
||
};
|
||
|
||
module_usb_driver(usbpn_driver);
|
||
|
||
MODULE_AUTHOR("Remi Denis-Courmont");
|
||
MODULE_DESCRIPTION("USB CDC Phonet host interface");
|
||
MODULE_LICENSE("GPL");
|