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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/ktime.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 | __le16 bcdSpecRevision; | |
121 | __u8 bmDataSize; | |
122 | __u8 bmWindowSize; | |
123 | __u8 bmMinTurnaroundTime; | |
124 | __le16 wBaudRate; | |
125 | __u8 bmAdditionalBOFs; | |
126 | __u8 bIrdaRateSniff; | |
127 | __u8 bMaxUnicastList; | |
128 | } __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 irlap_cb *irlap; /* The link layer we are binded to */ | |
156 | struct qos_info qos; | |
157 | char *speed_buff; /* Buffer for speed changes */ | |
158 | char *tx_buff; | |
159 | ||
160 | ktime_t stamp; | |
161 | ||
162 | spinlock_t lock; /* For serializing Tx operations */ | |
163 | ||
164 | __u16 xbofs; /* Current xbofs setting */ | |
165 | __s16 new_xbofs; /* xbofs we need to set */ | |
166 | __u32 speed; /* Current speed */ | |
167 | __s32 new_speed; /* speed we need to set */ | |
168 | ||
169 | __u8 header_length; /* USB-IrDA frame header size */ | |
170 | int needspatch; /* device needs firmware patch */ | |
171 | ||
172 | struct timer_list rx_defer_timer; /* Wait for Rx error to clear */ | |
173 | }; | |
174 |