The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1 | /* |
| 2 | * QEMU USB emulation |
| 3 | * |
| 4 | * Copyright (c) 2005 Fabrice Bellard |
| 5 | * |
| 6 | * 2008 Generic packet handler rewrite by Max Krasnyansky |
| 7 | * |
| 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 | */ |
| 26 | #include "qemu-common.h" |
| 27 | #include "usb.h" |
| 28 | |
| 29 | void usb_attach(USBPort *port, USBDevice *dev) |
| 30 | { |
| 31 | port->attach(port, dev); |
| 32 | } |
| 33 | |
| 34 | /**********************/ |
| 35 | |
| 36 | /* generic USB device helpers (you are not forced to use them when |
| 37 | writing your USB device driver, but they help handling the |
| 38 | protocol) |
| 39 | */ |
| 40 | |
| 41 | #define SETUP_STATE_IDLE 0 |
| 42 | #define SETUP_STATE_DATA 1 |
| 43 | #define SETUP_STATE_ACK 2 |
| 44 | |
| 45 | static int do_token_setup(USBDevice *s, USBPacket *p) |
| 46 | { |
| 47 | int request, value, index; |
| 48 | int ret = 0; |
| 49 | |
| 50 | if (p->len != 8) |
| 51 | return USB_RET_STALL; |
| 52 | |
| 53 | memcpy(s->setup_buf, p->data, 8); |
| 54 | s->setup_len = (s->setup_buf[7] << 8) | s->setup_buf[6]; |
| 55 | s->setup_index = 0; |
| 56 | |
| 57 | request = (s->setup_buf[0] << 8) | s->setup_buf[1]; |
| 58 | value = (s->setup_buf[3] << 8) | s->setup_buf[2]; |
| 59 | index = (s->setup_buf[5] << 8) | s->setup_buf[4]; |
| 60 | |
| 61 | if (s->setup_buf[0] & USB_DIR_IN) { |
| 62 | ret = s->handle_control(s, request, value, index, |
| 63 | s->setup_len, s->data_buf); |
| 64 | if (ret < 0) |
| 65 | return ret; |
| 66 | |
| 67 | if (ret < s->setup_len) |
| 68 | s->setup_len = ret; |
| 69 | s->setup_state = SETUP_STATE_DATA; |
| 70 | } else { |
| 71 | if (s->setup_len == 0) |
| 72 | s->setup_state = SETUP_STATE_ACK; |
| 73 | else |
| 74 | s->setup_state = SETUP_STATE_DATA; |
| 75 | } |
| 76 | |
| 77 | return ret; |
| 78 | } |
| 79 | |
| 80 | static int do_token_in(USBDevice *s, USBPacket *p) |
| 81 | { |
| 82 | int request, value, index; |
| 83 | int ret = 0; |
| 84 | |
| 85 | if (p->devep != 0) |
| 86 | return s->handle_data(s, p); |
| 87 | |
| 88 | request = (s->setup_buf[0] << 8) | s->setup_buf[1]; |
| 89 | value = (s->setup_buf[3] << 8) | s->setup_buf[2]; |
| 90 | index = (s->setup_buf[5] << 8) | s->setup_buf[4]; |
| 91 | |
| 92 | switch(s->setup_state) { |
| 93 | case SETUP_STATE_ACK: |
| 94 | if (!(s->setup_buf[0] & USB_DIR_IN)) { |
| 95 | s->setup_state = SETUP_STATE_IDLE; |
| 96 | ret = s->handle_control(s, request, value, index, |
| 97 | s->setup_len, s->data_buf); |
| 98 | if (ret > 0) |
| 99 | return 0; |
| 100 | return ret; |
| 101 | } |
| 102 | |
| 103 | /* return 0 byte */ |
| 104 | return 0; |
| 105 | |
| 106 | case SETUP_STATE_DATA: |
| 107 | if (s->setup_buf[0] & USB_DIR_IN) { |
| 108 | int len = s->setup_len - s->setup_index; |
| 109 | if (len > p->len) |
| 110 | len = p->len; |
| 111 | memcpy(p->data, s->data_buf + s->setup_index, len); |
| 112 | s->setup_index += len; |
| 113 | if (s->setup_index >= s->setup_len) |
| 114 | s->setup_state = SETUP_STATE_ACK; |
| 115 | return len; |
| 116 | } |
| 117 | |
| 118 | s->setup_state = SETUP_STATE_IDLE; |
| 119 | return USB_RET_STALL; |
| 120 | |
| 121 | default: |
| 122 | return USB_RET_STALL; |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | static int do_token_out(USBDevice *s, USBPacket *p) |
| 127 | { |
| 128 | if (p->devep != 0) |
| 129 | return s->handle_data(s, p); |
| 130 | |
| 131 | switch(s->setup_state) { |
| 132 | case SETUP_STATE_ACK: |
| 133 | if (s->setup_buf[0] & USB_DIR_IN) { |
| 134 | s->setup_state = SETUP_STATE_IDLE; |
| 135 | /* transfer OK */ |
| 136 | } else { |
| 137 | /* ignore additional output */ |
| 138 | } |
| 139 | return 0; |
| 140 | |
| 141 | case SETUP_STATE_DATA: |
| 142 | if (!(s->setup_buf[0] & USB_DIR_IN)) { |
| 143 | int len = s->setup_len - s->setup_index; |
| 144 | if (len > p->len) |
| 145 | len = p->len; |
| 146 | memcpy(s->data_buf + s->setup_index, p->data, len); |
| 147 | s->setup_index += len; |
| 148 | if (s->setup_index >= s->setup_len) |
| 149 | s->setup_state = SETUP_STATE_ACK; |
| 150 | return len; |
| 151 | } |
| 152 | |
| 153 | s->setup_state = SETUP_STATE_IDLE; |
| 154 | return USB_RET_STALL; |
| 155 | |
| 156 | default: |
| 157 | return USB_RET_STALL; |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | /* |
| 162 | * Generic packet handler. |
| 163 | * Called by the HC (host controller). |
| 164 | * |
| 165 | * Returns length of the transaction or one of the USB_RET_XXX codes. |
| 166 | */ |
| 167 | int usb_generic_handle_packet(USBDevice *s, USBPacket *p) |
| 168 | { |
| 169 | switch(p->pid) { |
| 170 | case USB_MSG_ATTACH: |
| 171 | s->state = USB_STATE_ATTACHED; |
| 172 | return 0; |
| 173 | |
| 174 | case USB_MSG_DETACH: |
| 175 | s->state = USB_STATE_NOTATTACHED; |
| 176 | return 0; |
| 177 | |
| 178 | case USB_MSG_RESET: |
| 179 | s->remote_wakeup = 0; |
| 180 | s->addr = 0; |
| 181 | s->state = USB_STATE_DEFAULT; |
| 182 | s->handle_reset(s); |
| 183 | return 0; |
| 184 | } |
| 185 | |
| 186 | /* Rest of the PIDs must match our address */ |
| 187 | if (s->state < USB_STATE_DEFAULT || p->devaddr != s->addr) |
| 188 | return USB_RET_NODEV; |
| 189 | |
| 190 | switch (p->pid) { |
| 191 | case USB_TOKEN_SETUP: |
| 192 | return do_token_setup(s, p); |
| 193 | |
| 194 | case USB_TOKEN_IN: |
| 195 | return do_token_in(s, p); |
| 196 | |
| 197 | case USB_TOKEN_OUT: |
| 198 | return do_token_out(s, p); |
| 199 | |
| 200 | default: |
| 201 | return USB_RET_STALL; |
| 202 | } |
| 203 | } |
| 204 | |
| 205 | /* XXX: fix overflow */ |
| 206 | int set_usb_string(uint8_t *buf, const char *str) |
| 207 | { |
| 208 | int len, i; |
| 209 | uint8_t *q; |
| 210 | |
| 211 | q = buf; |
| 212 | len = strlen(str); |
| 213 | *q++ = 2 * len + 2; |
| 214 | *q++ = 3; |
| 215 | for(i = 0; i < len; i++) { |
| 216 | *q++ = str[i]; |
| 217 | *q++ = 0; |
| 218 | } |
| 219 | return q - buf; |
| 220 | } |
| 221 | |
| 222 | /* Send an internal message to a USB device. */ |
| 223 | void usb_send_msg(USBDevice *dev, int msg) |
| 224 | { |
| 225 | USBPacket p; |
| 226 | memset(&p, 0, sizeof(p)); |
| 227 | p.pid = msg; |
| 228 | dev->handle_packet(dev, &p); |
| 229 | |
| 230 | /* This _must_ be synchronous */ |
| 231 | } |