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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/irda_device.h> /* struct irlap_cb */
#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 */
struct usb_interface *usbintf; /* init: probe_irda */
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 */
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;
char *speed_buff; /* Buffer for speed changes */
struct timeval stamp;
struct timeval now;
spinlock_t lock; /* For serializing Tx 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 */
struct timer_list rx_defer_timer; /* Wait for Rx error to clear */
};
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