linux/drivers/net/usb/cdc-phonet.c
Alexey Dobriyan b7f080cfe2 net: remove mm.h inclusion from netdevice.h
Remove linux/mm.h inclusion from netdevice.h -- it's unused (I've checked manually).

To prevent mm.h inclusion via other channels also extract "enum dma_data_direction"
definition into separate header. This tiny piece is what gluing netdevice.h with mm.h
via "netdevice.h => dmaengine.h => dma-mapping.h => scatterlist.h => mm.h".
Removal of mm.h from scatterlist.h was tried and was found not feasible
on most archs, so the link was cutoff earlier.

Hope people are OK with tiny include file.

Note, that mm_types.h is still dragged in, but it is a separate story.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-06-21 19:17:20 -07:00

475 lines
11 KiB
C
Raw Blame History

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

/*
* 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 = __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;
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 */
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_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;
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:
phonet = 1;
break;
}
}
data += dlen;
len -= dlen;
}
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, usbpn_setup);
if (!dev)
return -ENOMEM;
pnd = netdev_priv(dev);
SET_NETDEV_DEV(dev, &intf->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");