1 /*****************************************************************************
2 *
3 * Filename: irda-usb.h
4 * Version: 0.10
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 * Copyright (C) 2004, SigmaTel, Inc. <irquality@sigmatel.com>
13 * Copyright (C) 2005, Milan Beno <beno@pobox.sk>
14 * Copyright (C) 2006, Nick FEdchik <nick@fedchik.org.ua>
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 *
30 *****************************************************************************/
31
32 #include <linux/time.h>
33
34 #include <net/irda/irda.h>
35 #include <net/irda/irda_device.h> /* struct irlap_cb */
36
37 #define RX_COPY_THRESHOLD 200
38 #define IRDA_USB_MAX_MTU 2051
39 #define IRDA_USB_SPEED_MTU 64 /* Weird, but work like this */
40
41 /* Maximum number of active URB on the Rx path
42 * This is the amount of buffers the we keep between the USB harware and the
43 * IrDA stack.
44 *
45 * Note : the network layer does also queue the packets between us and the
46 * IrDA stack, and is actually pretty fast and efficient in doing that.
47 * Therefore, we don't need to have a large number of URBs, and we can
48 * perfectly live happy with only one. We certainly don't need to keep the
49 * full IrTTP window around here...
50 * I repeat for those who have trouble to understand : 1 URB is plenty
51 * good enough to handle back-to-back (brickwalled) frames. I tried it,
52 * it works (it's the hardware that has trouble doing it).
53 *
54 * Having 2 URBs would allow the USB stack to process one URB while we take
55 * care of the other and then swap the URBs...
56 * On the other hand, increasing the number of URB will have penalities
57 * in term of latency and will interact with the link management in IrLAP...
58 * Jean II */
59 #define IU_MAX_ACTIVE_RX_URBS 1 /* Don't touch !!! */
60
61 /* When a Rx URB is passed back to us, we can't reuse it immediately,
62 * because it may still be referenced by the USB layer. Therefore we
63 * need to keep one extra URB in the Rx path.
64 * Jean II */
65 #define IU_MAX_RX_URBS (IU_MAX_ACTIVE_RX_URBS + 1)
66
67 /* Various ugly stuff to try to workaround generic problems */
68 /* Send speed command in case of timeout, just for trying to get things sane */
69 #define IU_BUG_KICK_TIMEOUT
70 /* Show the USB class descriptor */
71 #undef IU_DUMP_CLASS_DESC
72 /* Assume a minimum round trip latency for USB transfer (in us)...
73 * USB transfer are done in the next USB slot if there is no traffic
74 * (1/19 msec) and is done at 12 Mb/s :
75 * Waiting for slot + tx = (53us + 16us) * 2 = 137us minimum.
76 * Rx notification will only be done at the end of the USB frame period :
77 * OHCI : frame period = 1ms
78 * UHCI : frame period = 1ms, but notification can take 2 or 3 ms :-(
79 * EHCI : frame period = 125us */
80 #define IU_USB_MIN_RTT 500 /* This should be safe in most cases */
81
82 /* Inbound header */
83 #define MEDIA_BUSY 0x80
84
85 #define SPEED_2400 0x01
86 #define SPEED_9600 0x02
87 #define SPEED_19200 0x03
88 #define SPEED_38400 0x04
89 #define SPEED_57600 0x05
90 #define SPEED_115200 0x06
91 #define SPEED_576000 0x07
92 #define SPEED_1152000 0x08
93 #define SPEED_4000000 0x09
94 #define SPEED_16000000 0x0a
95
96 /* Basic capabilities */
97 #define IUC_DEFAULT 0x00 /* Basic device compliant with 1.0 spec */
98 /* Main bugs */
99 #define IUC_SPEED_BUG 0x01 /* Device doesn't set speed after the frame */
100 #define IUC_NO_WINDOW 0x02 /* Device doesn't behave with big Rx window */
101 #define IUC_NO_TURN 0x04 /* Device doesn't do turnaround by itself */
102 /* Not currently used */
103 #define IUC_SIR_ONLY 0x08 /* Device doesn't behave at FIR speeds */
104 #define IUC_SMALL_PKT 0x10 /* Device doesn't behave with big Rx packets */
105 #define IUC_MAX_WINDOW 0x20 /* Device underestimate the Rx window */
106 #define IUC_MAX_XBOFS 0x40 /* Device need more xbofs than advertised */
107 #define IUC_STIR421X 0x80 /* SigmaTel 4210/4220/4116 VFIR */
108
109 /* USB class definitions */
110 #define USB_IRDA_HEADER 0x01
111 #define USB_CLASS_IRDA 0x02 /* USB_CLASS_APP_SPEC subclass */
112 #define USB_DT_IRDA 0x21
113 #define USB_IRDA_STIR421X_HEADER 0x03
114 #define IU_SIGMATEL_MAX_RX_URBS (IU_MAX_ACTIVE_RX_URBS + \
115 USB_IRDA_STIR421X_HEADER)
116
117 struct irda_class_desc {
118 __u8 bLength;
119 __u8 bDescriptorType;
120 __u16 bcdSpecRevision;
121 __u8 bmDataSize;
122 __u8 bmWindowSize;
123 __u8 bmMinTurnaroundTime;
124 __u16 wBaudRate;
125 __u8 bmAdditionalBOFs;
126 __u8 bIrdaRateSniff;
127 __u8 bMaxUnicastList;
128 } __attribute__ ((packed));
129
130 /* class specific interface request to get the IrDA-USB class descriptor
131 * (6.2.5, USB-IrDA class spec 1.0) */
132
133 #define IU_REQ_GET_CLASS_DESC 0x06
134 #define STIR421X_MAX_PATCH_DOWNLOAD_SIZE 1023
135
136 struct irda_usb_cb {
137 struct irda_class_desc *irda_desc;
138 struct usb_device *usbdev; /* init: probe_irda */
139 struct usb_interface *usbintf; /* init: probe_irda */
140 int netopen; /* Device is active for network */
141 int present; /* Device is present on the bus */
142 __u32 capability; /* Capability of the hardware */
143 __u8 bulk_in_ep; /* Rx Endpoint assignments */
144 __u8 bulk_out_ep; /* Tx Endpoint assignments */
145 __u16 bulk_out_mtu; /* Max Tx packet size in bytes */
146 __u8 bulk_int_ep; /* Interrupt Endpoint assignments */
147
148 __u8 max_rx_urb;
149 struct urb **rx_urb; /* URBs used to receive data frames */
150 struct urb *idle_rx_urb; /* Pointer to idle URB in Rx path */
151 struct urb *tx_urb; /* URB used to send data frames */
152 struct urb *speed_urb; /* URB used to send speed commands */
153
154 struct net_device *netdev; /* Yes! we are some kind of netdev. */
155 struct net_device_stats stats;
156 struct irlap_cb *irlap; /* The link layer we are binded to */
157 struct qos_info qos;
158 char *speed_buff; /* Buffer for speed changes */
159 char *tx_buff;
160
161 struct timeval stamp;
162 struct timeval now;
163
164 spinlock_t lock; /* For serializing Tx operations */
165
166 __u16 xbofs; /* Current xbofs setting */
167 __s16 new_xbofs; /* xbofs we need to set */
168 __u32 speed; /* Current speed */
169 __s32 new_speed; /* speed we need to set */
170
171 __u8 header_length; /* USB-IrDA frame header size */
172 int needspatch; /* device needs firmware patch */
173
174 struct timer_list rx_defer_timer; /* Wait for Rx error to clear */
175 };
176
177
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