Skip to content
Permalink
Branch: master
Find file Copy path
Find file Copy path
Fetching contributors…
Cannot retrieve contributors at this time
429 lines (363 sloc) 9.76 KB
// SPDX-License-Identifier: GPL-2.0-only
/*
* phonet.c -- USB CDC Phonet host driver
*
* Copyright (C) 2008-2009 Nokia Corporation. All rights reserved.
*
* Author: Rémi Denis-Courmont
*/
#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;
unsigned long flags;
switch (status) {
case 0:
dev->stats.tx_bytes += skb->len;
break;
case -ENOENT:
case -ECONNRESET:
case -ESHUTDOWN:
dev->stats.tx_aborted_errors++;
/* fall through */
default:
dev->stats.tx_errors++;
dev_dbg(&dev->dev, "TX error (%d)\n", status);
}
dev->stats.tx_packets++;
spin_lock_irqsave(&pnd->tx_lock, flags);
pnd->tx_queue--;
netif_wake_queue(dev);
spin_unlock_irqrestore(&pnd->tx_lock, flags);
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(struct_size(pnd, urbs, 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");
You can’t perform that action at this time.