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bb36d470 FB |
1 | /* |
2 | * QEMU USB emulation | |
3 | * | |
4 | * Copyright (c) 2005 Fabrice Bellard | |
5fafdf24 | 5 | * |
89b9b79f AL |
6 | * 2008 Generic packet handler rewrite by Max Krasnyansky |
7 | * | |
bb36d470 FB |
8 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
9 | * of this software and associated documentation files (the "Software"), to deal | |
10 | * in the Software without restriction, including without limitation the rights | |
11 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
12 | * copies of the Software, and to permit persons to whom the Software is | |
13 | * furnished to do so, subject to the following conditions: | |
14 | * | |
15 | * The above copyright notice and this permission notice shall be included in | |
16 | * all copies or substantial portions of the Software. | |
17 | * | |
18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
20 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
21 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
22 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
23 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
24 | * THE SOFTWARE. | |
25 | */ | |
87ecb68b PB |
26 | #include "qemu-common.h" |
27 | #include "usb.h" | |
bb36d470 FB |
28 | |
29 | void usb_attach(USBPort *port, USBDevice *dev) | |
30 | { | |
618c169b GH |
31 | if (dev != NULL) { |
32 | /* attach */ | |
33 | if (port->dev) { | |
34 | usb_attach(port, NULL); | |
35 | } | |
36 | dev->port = port; | |
37 | port->dev = dev; | |
38 | port->ops->attach(port); | |
39 | usb_send_msg(dev, USB_MSG_ATTACH); | |
40 | } else { | |
41 | /* detach */ | |
42 | dev = port->dev; | |
43 | port->ops->detach(port); | |
44 | if (dev) { | |
45 | usb_send_msg(dev, USB_MSG_DETACH); | |
46 | dev->port = NULL; | |
47 | port->dev = NULL; | |
48 | } | |
49 | } | |
bb36d470 FB |
50 | } |
51 | ||
01eacab6 GH |
52 | void usb_wakeup(USBDevice *dev) |
53 | { | |
54 | if (dev->remote_wakeup && dev->port && dev->port->ops->wakeup) { | |
55 | dev->port->ops->wakeup(dev); | |
56 | } | |
57 | } | |
58 | ||
bb36d470 | 59 | /**********************/ |
89b9b79f | 60 | |
bb36d470 FB |
61 | /* generic USB device helpers (you are not forced to use them when |
62 | writing your USB device driver, but they help handling the | |
5fafdf24 | 63 | protocol) |
bb36d470 FB |
64 | */ |
65 | ||
66 | #define SETUP_STATE_IDLE 0 | |
67 | #define SETUP_STATE_DATA 1 | |
68 | #define SETUP_STATE_ACK 2 | |
69 | ||
89b9b79f AL |
70 | static int do_token_setup(USBDevice *s, USBPacket *p) |
71 | { | |
72 | int request, value, index; | |
73 | int ret = 0; | |
74 | ||
75 | if (p->len != 8) | |
76 | return USB_RET_STALL; | |
77 | ||
78 | memcpy(s->setup_buf, p->data, 8); | |
79 | s->setup_len = (s->setup_buf[7] << 8) | s->setup_buf[6]; | |
80 | s->setup_index = 0; | |
81 | ||
82 | request = (s->setup_buf[0] << 8) | s->setup_buf[1]; | |
83 | value = (s->setup_buf[3] << 8) | s->setup_buf[2]; | |
84 | index = (s->setup_buf[5] << 8) | s->setup_buf[4]; | |
85 | ||
86 | if (s->setup_buf[0] & USB_DIR_IN) { | |
806b6024 GH |
87 | ret = s->info->handle_control(s, request, value, index, |
88 | s->setup_len, s->data_buf); | |
89b9b79f AL |
89 | if (ret < 0) |
90 | return ret; | |
91 | ||
92 | if (ret < s->setup_len) | |
93 | s->setup_len = ret; | |
94 | s->setup_state = SETUP_STATE_DATA; | |
95 | } else { | |
96 | if (s->setup_len == 0) | |
97 | s->setup_state = SETUP_STATE_ACK; | |
98 | else | |
99 | s->setup_state = SETUP_STATE_DATA; | |
100 | } | |
101 | ||
102 | return ret; | |
103 | } | |
104 | ||
105 | static int do_token_in(USBDevice *s, USBPacket *p) | |
bb36d470 | 106 | { |
89b9b79f AL |
107 | int request, value, index; |
108 | int ret = 0; | |
109 | ||
110 | if (p->devep != 0) | |
806b6024 | 111 | return s->info->handle_data(s, p); |
89b9b79f AL |
112 | |
113 | request = (s->setup_buf[0] << 8) | s->setup_buf[1]; | |
114 | value = (s->setup_buf[3] << 8) | s->setup_buf[2]; | |
115 | index = (s->setup_buf[5] << 8) | s->setup_buf[4]; | |
116 | ||
117 | switch(s->setup_state) { | |
118 | case SETUP_STATE_ACK: | |
119 | if (!(s->setup_buf[0] & USB_DIR_IN)) { | |
120 | s->setup_state = SETUP_STATE_IDLE; | |
806b6024 GH |
121 | ret = s->info->handle_control(s, request, value, index, |
122 | s->setup_len, s->data_buf); | |
89b9b79f AL |
123 | if (ret > 0) |
124 | return 0; | |
125 | return ret; | |
126 | } | |
127 | ||
128 | /* return 0 byte */ | |
129 | return 0; | |
130 | ||
131 | case SETUP_STATE_DATA: | |
132 | if (s->setup_buf[0] & USB_DIR_IN) { | |
133 | int len = s->setup_len - s->setup_index; | |
134 | if (len > p->len) | |
135 | len = p->len; | |
136 | memcpy(p->data, s->data_buf + s->setup_index, len); | |
137 | s->setup_index += len; | |
138 | if (s->setup_index >= s->setup_len) | |
139 | s->setup_state = SETUP_STATE_ACK; | |
140 | return len; | |
141 | } | |
142 | ||
143 | s->setup_state = SETUP_STATE_IDLE; | |
144 | return USB_RET_STALL; | |
145 | ||
146 | default: | |
147 | return USB_RET_STALL; | |
148 | } | |
149 | } | |
150 | ||
151 | static int do_token_out(USBDevice *s, USBPacket *p) | |
152 | { | |
153 | if (p->devep != 0) | |
806b6024 | 154 | return s->info->handle_data(s, p); |
89b9b79f AL |
155 | |
156 | switch(s->setup_state) { | |
157 | case SETUP_STATE_ACK: | |
158 | if (s->setup_buf[0] & USB_DIR_IN) { | |
159 | s->setup_state = SETUP_STATE_IDLE; | |
160 | /* transfer OK */ | |
161 | } else { | |
162 | /* ignore additional output */ | |
163 | } | |
164 | return 0; | |
165 | ||
166 | case SETUP_STATE_DATA: | |
167 | if (!(s->setup_buf[0] & USB_DIR_IN)) { | |
168 | int len = s->setup_len - s->setup_index; | |
169 | if (len > p->len) | |
170 | len = p->len; | |
171 | memcpy(s->data_buf + s->setup_index, p->data, len); | |
172 | s->setup_index += len; | |
173 | if (s->setup_index >= s->setup_len) | |
174 | s->setup_state = SETUP_STATE_ACK; | |
175 | return len; | |
176 | } | |
177 | ||
178 | s->setup_state = SETUP_STATE_IDLE; | |
179 | return USB_RET_STALL; | |
180 | ||
181 | default: | |
182 | return USB_RET_STALL; | |
183 | } | |
184 | } | |
bb36d470 | 185 | |
89b9b79f AL |
186 | /* |
187 | * Generic packet handler. | |
188 | * Called by the HC (host controller). | |
189 | * | |
190 | * Returns length of the transaction or one of the USB_RET_XXX codes. | |
191 | */ | |
192 | int usb_generic_handle_packet(USBDevice *s, USBPacket *p) | |
193 | { | |
4d611c9a | 194 | switch(p->pid) { |
bb36d470 FB |
195 | case USB_MSG_ATTACH: |
196 | s->state = USB_STATE_ATTACHED; | |
b6f77fbe GH |
197 | if (s->info->handle_attach) { |
198 | s->info->handle_attach(s); | |
199 | } | |
89b9b79f AL |
200 | return 0; |
201 | ||
bb36d470 FB |
202 | case USB_MSG_DETACH: |
203 | s->state = USB_STATE_NOTATTACHED; | |
89b9b79f AL |
204 | return 0; |
205 | ||
bb36d470 FB |
206 | case USB_MSG_RESET: |
207 | s->remote_wakeup = 0; | |
208 | s->addr = 0; | |
209 | s->state = USB_STATE_DEFAULT; | |
b6f77fbe GH |
210 | if (s->info->handle_reset) { |
211 | s->info->handle_reset(s); | |
212 | } | |
89b9b79f AL |
213 | return 0; |
214 | } | |
215 | ||
216 | /* Rest of the PIDs must match our address */ | |
217 | if (s->state < USB_STATE_DEFAULT || p->devaddr != s->addr) | |
218 | return USB_RET_NODEV; | |
219 | ||
220 | switch (p->pid) { | |
bb36d470 | 221 | case USB_TOKEN_SETUP: |
89b9b79f AL |
222 | return do_token_setup(s, p); |
223 | ||
bb36d470 | 224 | case USB_TOKEN_IN: |
89b9b79f AL |
225 | return do_token_in(s, p); |
226 | ||
bb36d470 | 227 | case USB_TOKEN_OUT: |
89b9b79f AL |
228 | return do_token_out(s, p); |
229 | ||
bb36d470 | 230 | default: |
89b9b79f | 231 | return USB_RET_STALL; |
bb36d470 | 232 | } |
bb36d470 FB |
233 | } |
234 | ||
235 | /* XXX: fix overflow */ | |
236 | int set_usb_string(uint8_t *buf, const char *str) | |
237 | { | |
238 | int len, i; | |
239 | uint8_t *q; | |
240 | ||
241 | q = buf; | |
242 | len = strlen(str); | |
ce5c37c2 | 243 | *q++ = 2 * len + 2; |
bb36d470 FB |
244 | *q++ = 3; |
245 | for(i = 0; i < len; i++) { | |
246 | *q++ = str[i]; | |
247 | *q++ = 0; | |
248 | } | |
249 | return q - buf; | |
250 | } | |
4d611c9a PB |
251 | |
252 | /* Send an internal message to a USB device. */ | |
253 | void usb_send_msg(USBDevice *dev, int msg) | |
254 | { | |
255 | USBPacket p; | |
256 | memset(&p, 0, sizeof(p)); | |
257 | p.pid = msg; | |
806b6024 | 258 | dev->info->handle_packet(dev, &p); |
4d611c9a | 259 | |
89b9b79f AL |
260 | /* This _must_ be synchronous */ |
261 | } |