irda-usb.h
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上传日期:2013-02-24
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- /*****************************************************************************
- *
- * Filename: irda-usb.h
- * Version: 0.9b
- * Description: IrDA-USB Driver
- * Status: Experimental
- * Author: Dag Brattli <dag@brattli.net>
- *
- * Copyright (C) 2001, Roman Weissgaerber <weissg@vienna.at>
- * Copyright (C) 2000, Dag Brattli <dag@brattli.net>
- * Copyright (C) 2001, Jean Tourrilhes <jt@hpl.hp.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., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- *****************************************************************************/
- #include <linux/time.h>
- #include <net/irda/irda.h>
- #include <net/irda/irlap.h>
- #include <net/irda/irda_device.h>
- #define RX_COPY_THRESHOLD 200
- #define IRDA_USB_MAX_MTU 2051
- #define IRDA_USB_SPEED_MTU 64 /* Weird, but work like this */
- /* Maximum number of active URB on the Rx path
- * This is the amount of buffers the we keep between the USB harware and the
- * IrDA stack.
- *
- * Note : the network layer does also queue the packets between us and the
- * IrDA stack, and is actually pretty fast and efficient in doing that.
- * Therefore, we don't need to have a large number of URBs, and we can
- * perfectly live happy with only one. We certainly don't need to keep the
- * full IrTTP window around here...
- * I repeat for those who have trouble to understand : 1 URB is plenty
- * good enough to handle back-to-back (brickwalled) frames. I tried it,
- * it works (it's the hardware that has trouble doing it).
- *
- * Having 2 URBs would allow the USB stack to process one URB while we take
- * care of the other and then swap the URBs...
- * On the other hand, increasing the number of URB will have penalities
- * in term of latency and will interact with the link management in IrLAP...
- * Jean II */
- #define IU_MAX_ACTIVE_RX_URBS 1 /* Don't touch !!! */
- /* When a Rx URB is passed back to us, we can't reuse it immediately,
- * because it may still be referenced by the USB layer. Therefore we
- * need to keep one extra URB in the Rx path.
- * Jean II */
- #define IU_MAX_RX_URBS (IU_MAX_ACTIVE_RX_URBS + 1)
- /* Various ugly stuff to try to workaround generic problems */
- /* Send speed command in case of timeout, just for trying to get things sane */
- #define IU_BUG_KICK_TIMEOUT
- /* Show the USB class descriptor */
- #undef IU_DUMP_CLASS_DESC
- /* Assume a minimum round trip latency for USB transfer (in us)...
- * USB transfer are done in the next USB slot if there is no traffic
- * (1/19 msec) and is done at 12 Mb/s :
- * Waiting for slot + tx = (53us + 16us) * 2 = 137us minimum.
- * Rx notification will only be done at the end of the USB frame period :
- * OHCI : frame period = 1ms
- * UHCI : frame period = 1ms, but notification can take 2 or 3 ms :-(
- * EHCI : frame period = 125us */
- #define IU_USB_MIN_RTT 500 /* This should be safe in most cases */
- /* Inbound header */
- #define MEDIA_BUSY 0x80
- #define SPEED_2400 0x01
- #define SPEED_9600 0x02
- #define SPEED_19200 0x03
- #define SPEED_38400 0x04
- #define SPEED_57600 0x05
- #define SPEED_115200 0x06
- #define SPEED_576000 0x07
- #define SPEED_1152000 0x08
- #define SPEED_4000000 0x09
- /* Basic capabilities */
- #define IUC_DEFAULT 0x00 /* Basic device compliant with 1.0 spec */
- /* Main bugs */
- #define IUC_SPEED_BUG 0x01 /* Device doesn't set speed after the frame */
- #define IUC_NO_WINDOW 0x02 /* Device doesn't behave with big Rx window */
- #define IUC_NO_TURN 0x04 /* Device doesn't do turnaround by itself */
- /* Not currently used */
- #define IUC_SIR_ONLY 0x08 /* Device doesn't behave at FIR speeds */
- #define IUC_SMALL_PKT 0x10 /* Device doesn't behave with big Rx packets */
- #define IUC_MAX_WINDOW 0x20 /* Device underestimate the Rx window */
- #define IUC_MAX_XBOFS 0x40 /* Device need more xbofs than advertised */
- /* USB class definitions */
- #define USB_IRDA_HEADER 0x01
- #define USB_CLASS_IRDA 0x02 /* USB_CLASS_APP_SPEC subclass */
- #define USB_DT_IRDA 0x21
- struct irda_class_desc {
- __u8 bLength;
- __u8 bDescriptorType;
- __u16 bcdSpecRevision;
- __u8 bmDataSize;
- __u8 bmWindowSize;
- __u8 bmMinTurnaroundTime;
- __u16 wBaudRate;
- __u8 bmAdditionalBOFs;
- __u8 bIrdaRateSniff;
- __u8 bMaxUnicastList;
- } __attribute__ ((packed));
- /* class specific interface request to get the IrDA-USB class descriptor
- * (6.2.5, USB-IrDA class spec 1.0) */
- #define IU_REQ_GET_CLASS_DESC 0x06
- struct irda_usb_cb {
- struct irda_class_desc *irda_desc;
- struct usb_device *usbdev; /* init: probe_irda */
- unsigned int ifnum; /* Interface number of the USB dev. */
- int netopen; /* Device is active for network */
- int present; /* Device is present on the bus */
- __u32 capability; /* Capability of the hardware */
- __u8 bulk_in_ep; /* Rx Endpoint assignments */
- __u8 bulk_out_ep; /* Tx Endpoint assignments */
- __u16 bulk_out_mtu; /* Max Tx packet size in bytes */
- __u8 bulk_int_ep; /* Interrupt Endpoint assignments */
- wait_queue_head_t wait_q; /* for timeouts */
- struct urb rx_urb[IU_MAX_RX_URBS]; /* URBs used to receive data frames */
- struct urb *idle_rx_urb; /* Pointer to idle URB in Rx path */
- struct urb tx_urb; /* URB used to send data frames */
- struct urb speed_urb; /* URB used to send speed commands */
-
- struct net_device *netdev; /* Yes! we are some kind of netdev. */
- struct net_device_stats stats;
- struct irlap_cb *irlap; /* The link layer we are binded to */
- struct qos_info qos;
- hashbin_t *tx_list; /* Queued transmit skb's */
- char *speed_buff; /* Buffer for speed changes */
- struct timeval stamp;
- struct timeval now;
- spinlock_t lock; /* For serializing operations */
- __u16 xbofs; /* Current xbofs setting */
- __s16 new_xbofs; /* xbofs we need to set */
- __u32 speed; /* Current speed */
- __s32 new_speed; /* speed we need to set */
- __u32 flags; /* Interface flags */
- };