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linux/drivers/usb/net/usbnet.h
Arnd Bergmann a9fc6338bd usbnet: add a mutex around phy register access 
When working on the mcs7830, I noticed the need for a mutex in its
mdio_read/mdio_write functions. A related problem seems to be present
in the asix driver in the respective functions.

This introduces a mutex in the common usbnet driver and uses it
from the two hardware specific drivers.

Acked-by: David Hollis <dhollis@davehollis.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-10-17 14:46:32 -07:00

200 lines
6.4 KiB
C
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/*
* USB Networking Link Interface
*
* Copyright (C) 2000-2005 by David Brownell <dbrownell@users.sourceforge.net>
* Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef __USBNET_H
#define __USBNET_H
/* interface from usbnet core to each USB networking link we handle */
struct usbnet {
/* housekeeping */
struct usb_device *udev;
struct driver_info *driver_info;
wait_queue_head_t *wait;
struct mutex phy_mutex;
/* i/o info: pipes etc */
unsigned in, out;
struct usb_host_endpoint *status;
unsigned maxpacket;
struct timer_list delay;
/* protocol/interface state */
struct net_device *net;
struct net_device_stats stats;
int msg_enable;
unsigned long data [5];
u32 xid;
u32 hard_mtu; /* count any extra framing */
size_t rx_urb_size; /* size for rx urbs */
struct mii_if_info mii;
/* various kinds of pending driver work */
struct sk_buff_head rxq;
struct sk_buff_head txq;
struct sk_buff_head done;
struct urb *interrupt;
struct tasklet_struct bh;
struct work_struct kevent;
unsigned long flags;
# define EVENT_TX_HALT 0
# define EVENT_RX_HALT 1
# define EVENT_RX_MEMORY 2
# define EVENT_STS_SPLIT 3
# define EVENT_LINK_RESET 4
};
static inline struct usb_driver *driver_of(struct usb_interface *intf)
{
return to_usb_driver(intf->dev.driver);
}
/* interface from the device/framing level "minidriver" to core */
struct driver_info {
char *description;
int flags;
/* framing is CDC Ethernet, not writing ZLPs (hw issues), or optionally: */
#define FLAG_FRAMING_NC 0x0001 /* guard against device dropouts */
#define FLAG_FRAMING_GL 0x0002 /* genelink batches packets */
#define FLAG_FRAMING_Z 0x0004 /* zaurus adds a trailer */
#define FLAG_FRAMING_RN 0x0008 /* RNDIS batches, plus huge header */
#define FLAG_NO_SETINT 0x0010 /* device can't set_interface() */
#define FLAG_ETHER 0x0020 /* maybe use "eth%d" names */
#define FLAG_FRAMING_AX 0x0040 /* AX88772/178 packets */
/* init device ... can sleep, or cause probe() failure */
int (*bind)(struct usbnet *, struct usb_interface *);
/* cleanup device ... can sleep, but can't fail */
void (*unbind)(struct usbnet *, struct usb_interface *);
/* reset device ... can sleep */
int (*reset)(struct usbnet *);
/* see if peer is connected ... can sleep */
int (*check_connect)(struct usbnet *);
/* for status polling */
void (*status)(struct usbnet *, struct urb *);
/* link reset handling, called from defer_kevent */
int (*link_reset)(struct usbnet *);
/* fixup rx packet (strip framing) */
int (*rx_fixup)(struct usbnet *dev, struct sk_buff *skb);
/* fixup tx packet (add framing) */
struct sk_buff *(*tx_fixup)(struct usbnet *dev,
struct sk_buff *skb, gfp_t flags);
/* for new devices, use the descriptor-reading code instead */
int in; /* rx endpoint */
int out; /* tx endpoint */
unsigned long data; /* Misc driver specific data */
};
/* Minidrivers are just drivers using the "usbnet" core as a powerful
* network-specific subroutine library ... that happens to do pretty
* much everything except custom framing and chip-specific stuff.
*/
extern int usbnet_probe(struct usb_interface *, const struct usb_device_id *);
extern int usbnet_suspend (struct usb_interface *, pm_message_t );
extern int usbnet_resume (struct usb_interface *);
extern void usbnet_disconnect(struct usb_interface *);
/* Drivers that reuse some of the standard USB CDC infrastructure
* (notably, using multiple interfaces according to the the CDC
* union descriptor) get some helper code.
*/
struct cdc_state {
struct usb_cdc_header_desc *header;
struct usb_cdc_union_desc *u;
struct usb_cdc_ether_desc *ether;
struct usb_interface *control;
struct usb_interface *data;
};
extern int usbnet_generic_cdc_bind (struct usbnet *, struct usb_interface *);
extern void usbnet_cdc_unbind (struct usbnet *, struct usb_interface *);
/* CDC and RNDIS support the same host-chosen packet filters for IN transfers */
#define DEFAULT_FILTER (USB_CDC_PACKET_TYPE_BROADCAST \
|USB_CDC_PACKET_TYPE_ALL_MULTICAST \
|USB_CDC_PACKET_TYPE_PROMISCUOUS \
|USB_CDC_PACKET_TYPE_DIRECTED)
/* we record the state for each of our queued skbs */
enum skb_state {
illegal = 0,
tx_start, tx_done,
rx_start, rx_done, rx_cleanup
};
struct skb_data { /* skb->cb is one of these */
struct urb *urb;
struct usbnet *dev;
enum skb_state state;
size_t length;
};
extern int usbnet_get_endpoints(struct usbnet *, struct usb_interface *);
extern void usbnet_defer_kevent (struct usbnet *, int);
extern void usbnet_skb_return (struct usbnet *, struct sk_buff *);
extern void usbnet_unlink_rx_urbs(struct usbnet *);
extern int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd);
extern int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd);
extern u32 usbnet_get_link (struct net_device *net);
extern u32 usbnet_get_msglevel (struct net_device *);
extern void usbnet_set_msglevel (struct net_device *, u32);
extern void usbnet_get_drvinfo (struct net_device *, struct ethtool_drvinfo *);
extern int usbnet_nway_reset(struct net_device *net);
/* messaging support includes the interface name, so it must not be
* used before it has one ... notably, in minidriver bind() calls.
*/
#ifdef DEBUG
#define devdbg(usbnet, fmt, arg...) \
printk(KERN_DEBUG "%s: " fmt "\n" , (usbnet)->net->name , ## arg)
#else
#define devdbg(usbnet, fmt, arg...) do {} while(0)
#endif
#define deverr(usbnet, fmt, arg...) \
printk(KERN_ERR "%s: " fmt "\n" , (usbnet)->net->name , ## arg)
#define devwarn(usbnet, fmt, arg...) \
printk(KERN_WARNING "%s: " fmt "\n" , (usbnet)->net->name , ## arg)
#define devinfo(usbnet, fmt, arg...) \
printk(KERN_INFO "%s: " fmt "\n" , (usbnet)->net->name , ## arg); \
#endif /* __USBNET_H */
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