1 /* 2 * This work is licensed under the terms of the GNU GPL, version 2 or 3 * (at your option) any later version. See the COPYING file in the 4 * top-level directory. 5 */ 6 7 #include "qemu/osdep.h" 8 #include "qapi/error.h" 9 #include "qemu/iov.h" 10 #include "trace.h" 11 12 #include "hw/qdev.h" 13 #include "hw/virtio/virtio.h" 14 #include "hw/virtio/virtio-input.h" 15 16 #include "standard-headers/linux/input.h" 17 18 #define VIRTIO_INPUT_VM_VERSION 1 19 20 /* ----------------------------------------------------------------- */ 21 22 void virtio_input_send(VirtIOInput *vinput, virtio_input_event *event) 23 { 24 VirtQueueElement *elem; 25 int i, len; 26 27 if (!vinput->active) { 28 return; 29 } 30 31 /* queue up events ... */ 32 if (vinput->qindex == vinput->qsize) { 33 vinput->qsize++; 34 vinput->queue = g_realloc(vinput->queue, vinput->qsize * 35 sizeof(vinput->queue[0])); 36 } 37 vinput->queue[vinput->qindex++].event = *event; 38 39 /* ... until we see a report sync ... */ 40 if (event->type != cpu_to_le16(EV_SYN) || 41 event->code != cpu_to_le16(SYN_REPORT)) { 42 return; 43 } 44 45 /* ... then check available space ... */ 46 for (i = 0; i < vinput->qindex; i++) { 47 elem = virtqueue_pop(vinput->evt, sizeof(VirtQueueElement)); 48 if (!elem) { 49 while (--i >= 0) { 50 virtqueue_unpop(vinput->evt, vinput->queue[i].elem, 0); 51 } 52 vinput->qindex = 0; 53 trace_virtio_input_queue_full(); 54 return; 55 } 56 vinput->queue[i].elem = elem; 57 } 58 59 /* ... and finally pass them to the guest */ 60 for (i = 0; i < vinput->qindex; i++) { 61 elem = vinput->queue[i].elem; 62 len = iov_from_buf(elem->in_sg, elem->in_num, 63 0, &vinput->queue[i].event, sizeof(virtio_input_event)); 64 virtqueue_push(vinput->evt, elem, len); 65 g_free(elem); 66 } 67 virtio_notify(VIRTIO_DEVICE(vinput), vinput->evt); 68 vinput->qindex = 0; 69 } 70 71 static void virtio_input_handle_evt(VirtIODevice *vdev, VirtQueue *vq) 72 { 73 /* nothing */ 74 } 75 76 static void virtio_input_handle_sts(VirtIODevice *vdev, VirtQueue *vq) 77 { 78 VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vdev); 79 VirtIOInput *vinput = VIRTIO_INPUT(vdev); 80 virtio_input_event event; 81 VirtQueueElement *elem; 82 int len; 83 84 for (;;) { 85 elem = virtqueue_pop(vinput->sts, sizeof(VirtQueueElement)); 86 if (!elem) { 87 break; 88 } 89 90 memset(&event, 0, sizeof(event)); 91 len = iov_to_buf(elem->out_sg, elem->out_num, 92 0, &event, sizeof(event)); 93 if (vic->handle_status) { 94 vic->handle_status(vinput, &event); 95 } 96 virtqueue_push(vinput->sts, elem, len); 97 g_free(elem); 98 } 99 virtio_notify(vdev, vinput->sts); 100 } 101 102 virtio_input_config *virtio_input_find_config(VirtIOInput *vinput, 103 uint8_t select, 104 uint8_t subsel) 105 { 106 VirtIOInputConfig *cfg; 107 108 QTAILQ_FOREACH(cfg, &vinput->cfg_list, node) { 109 if (select == cfg->config.select && 110 subsel == cfg->config.subsel) { 111 return &cfg->config; 112 } 113 } 114 return NULL; 115 } 116 117 void virtio_input_add_config(VirtIOInput *vinput, 118 virtio_input_config *config) 119 { 120 VirtIOInputConfig *cfg; 121 122 if (virtio_input_find_config(vinput, config->select, config->subsel)) { 123 /* should not happen */ 124 fprintf(stderr, "%s: duplicate config: %d/%d\n", 125 __func__, config->select, config->subsel); 126 abort(); 127 } 128 129 cfg = g_new0(VirtIOInputConfig, 1); 130 cfg->config = *config; 131 QTAILQ_INSERT_TAIL(&vinput->cfg_list, cfg, node); 132 } 133 134 void virtio_input_init_config(VirtIOInput *vinput, 135 virtio_input_config *config) 136 { 137 int i = 0; 138 139 QTAILQ_INIT(&vinput->cfg_list); 140 while (config[i].select) { 141 virtio_input_add_config(vinput, config + i); 142 i++; 143 } 144 } 145 146 void virtio_input_idstr_config(VirtIOInput *vinput, 147 uint8_t select, const char *string) 148 { 149 virtio_input_config id; 150 151 if (!string) { 152 return; 153 } 154 memset(&id, 0, sizeof(id)); 155 id.select = select; 156 id.size = snprintf(id.u.string, sizeof(id.u.string), "%s", string); 157 virtio_input_add_config(vinput, &id); 158 } 159 160 static void virtio_input_get_config(VirtIODevice *vdev, uint8_t *config_data) 161 { 162 VirtIOInput *vinput = VIRTIO_INPUT(vdev); 163 virtio_input_config *config; 164 165 config = virtio_input_find_config(vinput, vinput->cfg_select, 166 vinput->cfg_subsel); 167 if (config) { 168 memcpy(config_data, config, vinput->cfg_size); 169 } else { 170 memset(config_data, 0, vinput->cfg_size); 171 } 172 } 173 174 static void virtio_input_set_config(VirtIODevice *vdev, 175 const uint8_t *config_data) 176 { 177 VirtIOInput *vinput = VIRTIO_INPUT(vdev); 178 virtio_input_config *config = (virtio_input_config *)config_data; 179 180 vinput->cfg_select = config->select; 181 vinput->cfg_subsel = config->subsel; 182 virtio_notify_config(vdev); 183 } 184 185 static uint64_t virtio_input_get_features(VirtIODevice *vdev, uint64_t f, 186 Error **errp) 187 { 188 return f; 189 } 190 191 static void virtio_input_set_status(VirtIODevice *vdev, uint8_t val) 192 { 193 VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vdev); 194 VirtIOInput *vinput = VIRTIO_INPUT(vdev); 195 196 if (val & VIRTIO_CONFIG_S_DRIVER_OK) { 197 if (!vinput->active) { 198 vinput->active = true; 199 if (vic->change_active) { 200 vic->change_active(vinput); 201 } 202 } 203 } 204 } 205 206 static void virtio_input_reset(VirtIODevice *vdev) 207 { 208 VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vdev); 209 VirtIOInput *vinput = VIRTIO_INPUT(vdev); 210 211 if (vinput->active) { 212 vinput->active = false; 213 if (vic->change_active) { 214 vic->change_active(vinput); 215 } 216 } 217 } 218 219 static int virtio_input_post_load(void *opaque, int version_id) 220 { 221 VirtIOInput *vinput = opaque; 222 VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vinput); 223 VirtIODevice *vdev = VIRTIO_DEVICE(vinput); 224 225 vinput->active = vdev->status & VIRTIO_CONFIG_S_DRIVER_OK; 226 if (vic->change_active) { 227 vic->change_active(vinput); 228 } 229 return 0; 230 } 231 232 static void virtio_input_device_realize(DeviceState *dev, Error **errp) 233 { 234 VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(dev); 235 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 236 VirtIOInput *vinput = VIRTIO_INPUT(dev); 237 VirtIOInputConfig *cfg; 238 Error *local_err = NULL; 239 240 if (vic->realize) { 241 vic->realize(dev, &local_err); 242 if (local_err) { 243 error_propagate(errp, local_err); 244 return; 245 } 246 } 247 248 virtio_input_idstr_config(vinput, VIRTIO_INPUT_CFG_ID_SERIAL, 249 vinput->serial); 250 251 QTAILQ_FOREACH(cfg, &vinput->cfg_list, node) { 252 if (vinput->cfg_size < cfg->config.size) { 253 vinput->cfg_size = cfg->config.size; 254 } 255 } 256 vinput->cfg_size += 8; 257 assert(vinput->cfg_size <= sizeof(virtio_input_config)); 258 259 virtio_init(vdev, "virtio-input", VIRTIO_ID_INPUT, 260 vinput->cfg_size); 261 vinput->evt = virtio_add_queue(vdev, 64, virtio_input_handle_evt); 262 vinput->sts = virtio_add_queue(vdev, 64, virtio_input_handle_sts); 263 } 264 265 static void virtio_input_finalize(Object *obj) 266 { 267 VirtIOInput *vinput = VIRTIO_INPUT(obj); 268 VirtIOInputConfig *cfg, *next; 269 270 QTAILQ_FOREACH_SAFE(cfg, &vinput->cfg_list, node, next) { 271 QTAILQ_REMOVE(&vinput->cfg_list, cfg, node); 272 g_free(cfg); 273 } 274 275 g_free(vinput->queue); 276 } 277 static void virtio_input_device_unrealize(DeviceState *dev, Error **errp) 278 { 279 VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(dev); 280 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 281 Error *local_err = NULL; 282 283 if (vic->unrealize) { 284 vic->unrealize(dev, &local_err); 285 if (local_err) { 286 error_propagate(errp, local_err); 287 return; 288 } 289 } 290 virtio_cleanup(vdev); 291 } 292 293 static const VMStateDescription vmstate_virtio_input = { 294 .name = "virtio-input", 295 .minimum_version_id = VIRTIO_INPUT_VM_VERSION, 296 .version_id = VIRTIO_INPUT_VM_VERSION, 297 .fields = (VMStateField[]) { 298 VMSTATE_VIRTIO_DEVICE, 299 VMSTATE_END_OF_LIST() 300 }, 301 .post_load = virtio_input_post_load, 302 }; 303 304 static Property virtio_input_properties[] = { 305 DEFINE_PROP_STRING("serial", VirtIOInput, serial), 306 DEFINE_PROP_END_OF_LIST(), 307 }; 308 309 static void virtio_input_class_init(ObjectClass *klass, void *data) 310 { 311 DeviceClass *dc = DEVICE_CLASS(klass); 312 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 313 314 dc->props = virtio_input_properties; 315 dc->vmsd = &vmstate_virtio_input; 316 set_bit(DEVICE_CATEGORY_INPUT, dc->categories); 317 vdc->realize = virtio_input_device_realize; 318 vdc->unrealize = virtio_input_device_unrealize; 319 vdc->get_config = virtio_input_get_config; 320 vdc->set_config = virtio_input_set_config; 321 vdc->get_features = virtio_input_get_features; 322 vdc->set_status = virtio_input_set_status; 323 vdc->reset = virtio_input_reset; 324 } 325 326 static const TypeInfo virtio_input_info = { 327 .name = TYPE_VIRTIO_INPUT, 328 .parent = TYPE_VIRTIO_DEVICE, 329 .instance_size = sizeof(VirtIOInput), 330 .class_size = sizeof(VirtIOInputClass), 331 .class_init = virtio_input_class_init, 332 .abstract = true, 333 .instance_finalize = virtio_input_finalize, 334 }; 335 336 /* ----------------------------------------------------------------- */ 337 338 static void virtio_register_types(void) 339 { 340 type_register_static(&virtio_input_info); 341 } 342 343 type_init(virtio_register_types) 344