175 lines
6.8 KiB
C
175 lines
6.8 KiB
C
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/*****************************************************************************
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*
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* Filename: irda-usb.h
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* Version: 0.10
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* Description: IrDA-USB Driver
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* Status: Experimental
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* Author: Dag Brattli <dag@brattli.net>
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*
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* Copyright (C) 2001, Roman Weissgaerber <weissg@vienna.at>
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* Copyright (C) 2000, Dag Brattli <dag@brattli.net>
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* Copyright (C) 2001, Jean Tourrilhes <jt@hpl.hp.com>
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* Copyright (C) 2004, SigmaTel, Inc. <irquality@sigmatel.com>
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* Copyright (C) 2005, Milan Beno <beno@pobox.sk>
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* Copyright (C) 2006, Nick FEdchik <nick@fedchik.org.ua>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*****************************************************************************/
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#include <linux/ktime.h>
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#include <net/irda/irda.h>
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#include <net/irda/irda_device.h> /* struct irlap_cb */
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#define RX_COPY_THRESHOLD 200
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#define IRDA_USB_MAX_MTU 2051
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#define IRDA_USB_SPEED_MTU 64 /* Weird, but work like this */
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/* Maximum number of active URB on the Rx path
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* This is the amount of buffers the we keep between the USB harware and the
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* IrDA stack.
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*
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* Note : the network layer does also queue the packets between us and the
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* IrDA stack, and is actually pretty fast and efficient in doing that.
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* Therefore, we don't need to have a large number of URBs, and we can
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* perfectly live happy with only one. We certainly don't need to keep the
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* full IrTTP window around here...
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* I repeat for those who have trouble to understand : 1 URB is plenty
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* good enough to handle back-to-back (brickwalled) frames. I tried it,
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* it works (it's the hardware that has trouble doing it).
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*
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* Having 2 URBs would allow the USB stack to process one URB while we take
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* care of the other and then swap the URBs...
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* On the other hand, increasing the number of URB will have penalities
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* in term of latency and will interact with the link management in IrLAP...
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* Jean II */
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#define IU_MAX_ACTIVE_RX_URBS 1 /* Don't touch !!! */
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/* When a Rx URB is passed back to us, we can't reuse it immediately,
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* because it may still be referenced by the USB layer. Therefore we
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* need to keep one extra URB in the Rx path.
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* Jean II */
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#define IU_MAX_RX_URBS (IU_MAX_ACTIVE_RX_URBS + 1)
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/* Various ugly stuff to try to workaround generic problems */
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/* Send speed command in case of timeout, just for trying to get things sane */
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#define IU_BUG_KICK_TIMEOUT
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/* Show the USB class descriptor */
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#undef IU_DUMP_CLASS_DESC
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/* Assume a minimum round trip latency for USB transfer (in us)...
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* USB transfer are done in the next USB slot if there is no traffic
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* (1/19 msec) and is done at 12 Mb/s :
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* Waiting for slot + tx = (53us + 16us) * 2 = 137us minimum.
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* Rx notification will only be done at the end of the USB frame period :
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* OHCI : frame period = 1ms
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* UHCI : frame period = 1ms, but notification can take 2 or 3 ms :-(
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* EHCI : frame period = 125us */
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#define IU_USB_MIN_RTT 500 /* This should be safe in most cases */
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/* Inbound header */
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#define MEDIA_BUSY 0x80
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#define SPEED_2400 0x01
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#define SPEED_9600 0x02
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#define SPEED_19200 0x03
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#define SPEED_38400 0x04
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#define SPEED_57600 0x05
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#define SPEED_115200 0x06
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#define SPEED_576000 0x07
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#define SPEED_1152000 0x08
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#define SPEED_4000000 0x09
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#define SPEED_16000000 0x0a
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/* Basic capabilities */
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#define IUC_DEFAULT 0x00 /* Basic device compliant with 1.0 spec */
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/* Main bugs */
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#define IUC_SPEED_BUG 0x01 /* Device doesn't set speed after the frame */
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#define IUC_NO_WINDOW 0x02 /* Device doesn't behave with big Rx window */
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#define IUC_NO_TURN 0x04 /* Device doesn't do turnaround by itself */
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/* Not currently used */
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#define IUC_SIR_ONLY 0x08 /* Device doesn't behave at FIR speeds */
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#define IUC_SMALL_PKT 0x10 /* Device doesn't behave with big Rx packets */
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#define IUC_MAX_WINDOW 0x20 /* Device underestimate the Rx window */
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#define IUC_MAX_XBOFS 0x40 /* Device need more xbofs than advertised */
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#define IUC_STIR421X 0x80 /* SigmaTel 4210/4220/4116 VFIR */
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/* USB class definitions */
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#define USB_IRDA_HEADER 0x01
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#define USB_CLASS_IRDA 0x02 /* USB_CLASS_APP_SPEC subclass */
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#define USB_DT_IRDA 0x21
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#define USB_IRDA_STIR421X_HEADER 0x03
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#define IU_SIGMATEL_MAX_RX_URBS (IU_MAX_ACTIVE_RX_URBS + \
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USB_IRDA_STIR421X_HEADER)
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struct irda_class_desc {
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__u8 bLength;
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__u8 bDescriptorType;
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__le16 bcdSpecRevision;
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__u8 bmDataSize;
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__u8 bmWindowSize;
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__u8 bmMinTurnaroundTime;
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__le16 wBaudRate;
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__u8 bmAdditionalBOFs;
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__u8 bIrdaRateSniff;
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__u8 bMaxUnicastList;
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} __packed;
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/* class specific interface request to get the IrDA-USB class descriptor
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* (6.2.5, USB-IrDA class spec 1.0) */
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#define IU_REQ_GET_CLASS_DESC 0x06
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#define STIR421X_MAX_PATCH_DOWNLOAD_SIZE 1023
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struct irda_usb_cb {
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struct irda_class_desc *irda_desc;
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struct usb_device *usbdev; /* init: probe_irda */
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struct usb_interface *usbintf; /* init: probe_irda */
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int netopen; /* Device is active for network */
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int present; /* Device is present on the bus */
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__u32 capability; /* Capability of the hardware */
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__u8 bulk_in_ep; /* Rx Endpoint assignments */
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__u8 bulk_out_ep; /* Tx Endpoint assignments */
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__u16 bulk_out_mtu; /* Max Tx packet size in bytes */
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__u8 bulk_int_ep; /* Interrupt Endpoint assignments */
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__u8 max_rx_urb;
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struct urb **rx_urb; /* URBs used to receive data frames */
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struct urb *idle_rx_urb; /* Pointer to idle URB in Rx path */
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struct urb *tx_urb; /* URB used to send data frames */
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struct urb *speed_urb; /* URB used to send speed commands */
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struct net_device *netdev; /* Yes! we are some kind of netdev. */
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struct irlap_cb *irlap; /* The link layer we are binded to */
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struct qos_info qos;
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char *speed_buff; /* Buffer for speed changes */
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char *tx_buff;
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ktime_t stamp;
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spinlock_t lock; /* For serializing Tx operations */
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__u16 xbofs; /* Current xbofs setting */
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__s16 new_xbofs; /* xbofs we need to set */
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__u32 speed; /* Current speed */
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__s32 new_speed; /* speed we need to set */
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__u8 header_length; /* USB-IrDA frame header size */
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int needspatch; /* device needs firmware patch */
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struct timer_list rx_defer_timer; /* Wait for Rx error to clear */
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};
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