1 /*****************************************************************************
2 *
3 * Filename: irda-usb.h
4 * Version: 0.9b
5 * Description: IrDA-USB Driver
6 * Status: Experimental
7 * Author: Dag Brattli <dag@brattli.net>
8 *
9 * Copyright (C) 2001, Roman Weissgaerber <weissg@vienna.at>
10 * Copyright (C) 2000, Dag Brattli <dag@brattli.net>
11 * Copyright (C) 2001, Jean Tourrilhes <jt@hpl.hp.com>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 *
27 *****************************************************************************/
28
29 #include <linux/time.h>
30
31 #include <net/irda/irda.h>
32 #include <net/irda/irda_device.h> /* struct irlap_cb */
33
34 #define RX_COPY_THRESHOLD 200
35 #define IRDA_USB_MAX_MTU 2051
36 #define IRDA_USB_SPEED_MTU 64 /* Weird, but work like this */
37
38 /* Maximum number of active URB on the Rx path
39 * This is the amount of buffers the we keep between the USB harware and the
40 * IrDA stack.
41 *
42 * Note : the network layer does also queue the packets between us and the
43 * IrDA stack, and is actually pretty fast and efficient in doing that.
44 * Therefore, we don't need to have a large number of URBs, and we can
45 * perfectly live happy with only one. We certainly don't need to keep the
46 * full IrTTP window around here...
47 * I repeat for those who have trouble to understand : 1 URB is plenty
48 * good enough to handle back-to-back (brickwalled) frames. I tried it,
49 * it works (it's the hardware that has trouble doing it).
50 *
51 * Having 2 URBs would allow the USB stack to process one URB while we take
52 * care of the other and then swap the URBs...
53 * On the other hand, increasing the number of URB will have penalities
54 * in term of latency and will interact with the link management in IrLAP...
55 * Jean II */
56 #define IU_MAX_ACTIVE_RX_URBS 1 /* Don't touch !!! */
57
58 /* When a Rx URB is passed back to us, we can't reuse it immediately,
59 * because it may still be referenced by the USB layer. Therefore we
60 * need to keep one extra URB in the Rx path.
61 * Jean II */
62 #define IU_MAX_RX_URBS (IU_MAX_ACTIVE_RX_URBS + 1)
63
64 /* Various ugly stuff to try to workaround generic problems */
65 /* Send speed command in case of timeout, just for trying to get things sane */
66 #define IU_BUG_KICK_TIMEOUT
67 /* Show the USB class descriptor */
68 #undef IU_DUMP_CLASS_DESC
69 /* Assume a minimum round trip latency for USB transfer (in us)...
70 * USB transfer are done in the next USB slot if there is no traffic
71 * (1/19 msec) and is done at 12 Mb/s :
72 * Waiting for slot + tx = (53us + 16us) * 2 = 137us minimum.
73 * Rx notification will only be done at the end of the USB frame period :
74 * OHCI : frame period = 1ms
75 * UHCI : frame period = 1ms, but notification can take 2 or 3 ms :-(
76 * EHCI : frame period = 125us */
77 #define IU_USB_MIN_RTT 500 /* This should be safe in most cases */
78
79 /* Inbound header */
80 #define MEDIA_BUSY 0x80
81
82 #define SPEED_2400 0x01
83 #define SPEED_9600 0x02
84 #define SPEED_19200 0x03
85 #define SPEED_38400 0x04
86 #define SPEED_57600 0x05
87 #define SPEED_115200 0x06
88 #define SPEED_576000 0x07
89 #define SPEED_1152000 0x08
90 #define SPEED_4000000 0x09
91
92 /* Basic capabilities */
93 #define IUC_DEFAULT 0x00 /* Basic device compliant with 1.0 spec */
94 /* Main bugs */
95 #define IUC_SPEED_BUG 0x01 /* Device doesn't set speed after the frame */
96 #define IUC_NO_WINDOW 0x02 /* Device doesn't behave with big Rx window */
97 #define IUC_NO_TURN 0x04 /* Device doesn't do turnaround by itself */
98 /* Not currently used */
99 #define IUC_SIR_ONLY 0x08 /* Device doesn't behave at FIR speeds */
100 #define IUC_SMALL_PKT 0x10 /* Device doesn't behave with big Rx packets */
101 #define IUC_MAX_WINDOW 0x20 /* Device underestimate the Rx window */
102 #define IUC_MAX_XBOFS 0x40 /* Device need more xbofs than advertised */
103
104 /* USB class definitions */
105 #define USB_IRDA_HEADER 0x01
106 #define USB_CLASS_IRDA 0x02 /* USB_CLASS_APP_SPEC subclass */
107 #define USB_DT_IRDA 0x21
108
109 struct irda_class_desc {
110 __u8 bLength;
111 __u8 bDescriptorType;
112 __u16 bcdSpecRevision;
113 __u8 bmDataSize;
114 __u8 bmWindowSize;
115 __u8 bmMinTurnaroundTime;
116 __u16 wBaudRate;
117 __u8 bmAdditionalBOFs;
118 __u8 bIrdaRateSniff;
119 __u8 bMaxUnicastList;
120 } __attribute__ ((packed));
121
122 /* class specific interface request to get the IrDA-USB class descriptor
123 * (6.2.5, USB-IrDA class spec 1.0) */
124
125 #define IU_REQ_GET_CLASS_DESC 0x06
126
127 struct irda_usb_cb {
128 struct irda_class_desc *irda_desc;
129 struct usb_device *usbdev; /* init: probe_irda */
130 struct usb_interface *usbintf; /* init: probe_irda */
131 int netopen; /* Device is active for network */
132 int present; /* Device is present on the bus */
133 __u32 capability; /* Capability of the hardware */
134 __u8 bulk_in_ep; /* Rx Endpoint assignments */
135 __u8 bulk_out_ep; /* Tx Endpoint assignments */
136 __u16 bulk_out_mtu; /* Max Tx packet size in bytes */
137 __u8 bulk_int_ep; /* Interrupt Endpoint assignments */
138
139 wait_queue_head_t wait_q; /* for timeouts */
140
141 struct urb *rx_urb[IU_MAX_RX_URBS]; /* URBs used to receive data frames */
142 struct urb *idle_rx_urb; /* Pointer to idle URB in Rx path */
143 struct urb *tx_urb; /* URB used to send data frames */
144 struct urb *speed_urb; /* URB used to send speed commands */
145
146 struct net_device *netdev; /* Yes! we are some kind of netdev. */
147 struct net_device_stats stats;
148 struct irlap_cb *irlap; /* The link layer we are binded to */
149 struct qos_info qos;
150 hashbin_t *tx_list; /* Queued transmit skb's */
151 char *speed_buff; /* Buffer for speed changes */
152
153 struct timeval stamp;
154 struct timeval now;
155
156 spinlock_t lock; /* For serializing operations */
157
158 __u16 xbofs; /* Current xbofs setting */
159 __s16 new_xbofs; /* xbofs we need to set */
160 __u32 speed; /* Current speed */
161 __s32 new_speed; /* speed we need to set */
162 };
163
164
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