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 "qemu/module.h" 11 #include "trace.h" 12 13 #include "hw/virtio/virtio.h" 14 #include "hw/qdev-properties.h" 15 #include "hw/virtio/virtio-input.h" 16 17 #include "standard-headers/linux/input.h" 18 19 #define VIRTIO_INPUT_VM_VERSION 1 20 21 /* ----------------------------------------------------------------- */ 22 23 void virtio_input_send(VirtIOInput *vinput, virtio_input_event *event) 24 { 25 VirtQueueElement *elem; 26 int i, len; 27 28 if (!vinput->active) { 29 return; 30 } 31 32 /* queue up events ... */ 33 if (vinput->qindex == vinput->qsize) { 34 vinput->qsize++; 35 vinput->queue = g_realloc(vinput->queue, vinput->qsize * 36 sizeof(vinput->queue[0])); 37 } 38 vinput->queue[vinput->qindex++].event = *event; 39 40 /* ... until we see a report sync ... */ 41 if (event->type != cpu_to_le16(EV_SYN) || 42 event->code != cpu_to_le16(SYN_REPORT)) { 43 return; 44 } 45 46 /* ... then check available space ... */ 47 for (i = 0; i < vinput->qindex; i++) { 48 elem = virtqueue_pop(vinput->evt, sizeof(VirtQueueElement)); 49 if (!elem) { 50 while (--i >= 0) { 51 virtqueue_unpop(vinput->evt, vinput->queue[i].elem, 0); 52 } 53 vinput->qindex = 0; 54 trace_virtio_input_queue_full(); 55 return; 56 } 57 vinput->queue[i].elem = elem; 58 } 59 60 /* ... and finally pass them to the guest */ 61 for (i = 0; i < vinput->qindex; i++) { 62 elem = vinput->queue[i].elem; 63 len = iov_from_buf(elem->in_sg, elem->in_num, 64 0, &vinput->queue[i].event, sizeof(virtio_input_event)); 65 virtqueue_push(vinput->evt, elem, len); 66 g_free(elem); 67 } 68 virtio_notify(VIRTIO_DEVICE(vinput), vinput->evt); 69 vinput->qindex = 0; 70 } 71 72 static void virtio_input_handle_evt(VirtIODevice *vdev, VirtQueue *vq) 73 { 74 /* nothing */ 75 } 76 77 static void virtio_input_handle_sts(VirtIODevice *vdev, VirtQueue *vq) 78 { 79 VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vdev); 80 VirtIOInput *vinput = VIRTIO_INPUT(vdev); 81 virtio_input_event event; 82 VirtQueueElement *elem; 83 int len; 84 85 for (;;) { 86 elem = virtqueue_pop(vinput->sts, sizeof(VirtQueueElement)); 87 if (!elem) { 88 break; 89 } 90 91 memset(&event, 0, sizeof(event)); 92 len = iov_to_buf(elem->out_sg, elem->out_num, 93 0, &event, sizeof(event)); 94 if (vic->handle_status) { 95 vic->handle_status(vinput, &event); 96 } 97 virtqueue_push(vinput->sts, elem, len); 98 g_free(elem); 99 } 100 virtio_notify(vdev, vinput->sts); 101 } 102 103 virtio_input_config *virtio_input_find_config(VirtIOInput *vinput, 104 uint8_t select, 105 uint8_t subsel) 106 { 107 VirtIOInputConfig *cfg; 108 109 QTAILQ_FOREACH(cfg, &vinput->cfg_list, node) { 110 if (select == cfg->config.select && 111 subsel == cfg->config.subsel) { 112 return &cfg->config; 113 } 114 } 115 return NULL; 116 } 117 118 void virtio_input_add_config(VirtIOInput *vinput, 119 virtio_input_config *config) 120 { 121 VirtIOInputConfig *cfg; 122 123 if (virtio_input_find_config(vinput, config->select, config->subsel)) { 124 /* should not happen */ 125 fprintf(stderr, "%s: duplicate config: %d/%d\n", 126 __func__, config->select, config->subsel); 127 abort(); 128 } 129 130 cfg = g_new0(VirtIOInputConfig, 1); 131 cfg->config = *config; 132 QTAILQ_INSERT_TAIL(&vinput->cfg_list, cfg, node); 133 } 134 135 void virtio_input_init_config(VirtIOInput *vinput, 136 virtio_input_config *config) 137 { 138 int i = 0; 139 140 QTAILQ_INIT(&vinput->cfg_list); 141 while (config[i].select) { 142 virtio_input_add_config(vinput, config + i); 143 i++; 144 } 145 } 146 147 void virtio_input_idstr_config(VirtIOInput *vinput, 148 uint8_t select, const char *string) 149 { 150 virtio_input_config id; 151 152 if (!string) { 153 return; 154 } 155 memset(&id, 0, sizeof(id)); 156 id.select = select; 157 id.size = snprintf(id.u.string, sizeof(id.u.string), "%s", string); 158 virtio_input_add_config(vinput, &id); 159 } 160 161 static void virtio_input_get_config(VirtIODevice *vdev, uint8_t *config_data) 162 { 163 VirtIOInput *vinput = VIRTIO_INPUT(vdev); 164 virtio_input_config *config; 165 166 config = virtio_input_find_config(vinput, vinput->cfg_select, 167 vinput->cfg_subsel); 168 if (config) { 169 memcpy(config_data, config, vinput->cfg_size); 170 } else { 171 memset(config_data, 0, vinput->cfg_size); 172 } 173 } 174 175 static void virtio_input_set_config(VirtIODevice *vdev, 176 const uint8_t *config_data) 177 { 178 VirtIOInput *vinput = VIRTIO_INPUT(vdev); 179 virtio_input_config *config = (virtio_input_config *)config_data; 180 181 vinput->cfg_select = config->select; 182 vinput->cfg_subsel = config->subsel; 183 virtio_notify_config(vdev); 184 } 185 186 static uint64_t virtio_input_get_features(VirtIODevice *vdev, uint64_t f, 187 Error **errp) 188 { 189 return f; 190 } 191 192 static void virtio_input_set_status(VirtIODevice *vdev, uint8_t val) 193 { 194 VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vdev); 195 VirtIOInput *vinput = VIRTIO_INPUT(vdev); 196 197 if (val & VIRTIO_CONFIG_S_DRIVER_OK) { 198 if (!vinput->active) { 199 vinput->active = true; 200 if (vic->change_active) { 201 vic->change_active(vinput); 202 } 203 } 204 } 205 } 206 207 static void virtio_input_reset(VirtIODevice *vdev) 208 { 209 VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vdev); 210 VirtIOInput *vinput = VIRTIO_INPUT(vdev); 211 212 if (vinput->active) { 213 vinput->active = false; 214 if (vic->change_active) { 215 vic->change_active(vinput); 216 } 217 } 218 } 219 220 static int virtio_input_post_load(void *opaque, int version_id) 221 { 222 VirtIOInput *vinput = opaque; 223 VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vinput); 224 VirtIODevice *vdev = VIRTIO_DEVICE(vinput); 225 226 vinput->active = vdev->status & VIRTIO_CONFIG_S_DRIVER_OK; 227 if (vic->change_active) { 228 vic->change_active(vinput); 229 } 230 return 0; 231 } 232 233 static void virtio_input_device_realize(DeviceState *dev, Error **errp) 234 { 235 VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(dev); 236 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 237 VirtIOInput *vinput = VIRTIO_INPUT(dev); 238 VirtIOInputConfig *cfg; 239 Error *local_err = NULL; 240 241 if (vic->realize) { 242 vic->realize(dev, &local_err); 243 if (local_err) { 244 error_propagate(errp, local_err); 245 return; 246 } 247 } 248 249 virtio_input_idstr_config(vinput, VIRTIO_INPUT_CFG_ID_SERIAL, 250 vinput->serial); 251 252 QTAILQ_FOREACH(cfg, &vinput->cfg_list, node) { 253 if (vinput->cfg_size < cfg->config.size) { 254 vinput->cfg_size = cfg->config.size; 255 } 256 } 257 vinput->cfg_size += 8; 258 assert(vinput->cfg_size <= sizeof(virtio_input_config)); 259 260 virtio_init(vdev, "virtio-input", VIRTIO_ID_INPUT, 261 vinput->cfg_size); 262 vinput->evt = virtio_add_queue(vdev, 64, virtio_input_handle_evt); 263 vinput->sts = virtio_add_queue(vdev, 64, virtio_input_handle_sts); 264 } 265 266 static void virtio_input_finalize(Object *obj) 267 { 268 VirtIOInput *vinput = VIRTIO_INPUT(obj); 269 VirtIOInputConfig *cfg, *next; 270 271 QTAILQ_FOREACH_SAFE(cfg, &vinput->cfg_list, node, next) { 272 QTAILQ_REMOVE(&vinput->cfg_list, cfg, node); 273 g_free(cfg); 274 } 275 276 g_free(vinput->queue); 277 } 278 static void virtio_input_device_unrealize(DeviceState *dev, Error **errp) 279 { 280 VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(dev); 281 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 282 Error *local_err = NULL; 283 284 if (vic->unrealize) { 285 vic->unrealize(dev, &local_err); 286 if (local_err) { 287 error_propagate(errp, local_err); 288 return; 289 } 290 } 291 virtio_cleanup(vdev); 292 } 293 294 static const VMStateDescription vmstate_virtio_input = { 295 .name = "virtio-input", 296 .minimum_version_id = VIRTIO_INPUT_VM_VERSION, 297 .version_id = VIRTIO_INPUT_VM_VERSION, 298 .fields = (VMStateField[]) { 299 VMSTATE_VIRTIO_DEVICE, 300 VMSTATE_END_OF_LIST() 301 }, 302 .post_load = virtio_input_post_load, 303 }; 304 305 static Property virtio_input_properties[] = { 306 DEFINE_PROP_STRING("serial", VirtIOInput, serial), 307 DEFINE_PROP_END_OF_LIST(), 308 }; 309 310 static void virtio_input_class_init(ObjectClass *klass, void *data) 311 { 312 DeviceClass *dc = DEVICE_CLASS(klass); 313 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 314 315 dc->props = virtio_input_properties; 316 dc->vmsd = &vmstate_virtio_input; 317 set_bit(DEVICE_CATEGORY_INPUT, dc->categories); 318 vdc->realize = virtio_input_device_realize; 319 vdc->unrealize = virtio_input_device_unrealize; 320 vdc->get_config = virtio_input_get_config; 321 vdc->set_config = virtio_input_set_config; 322 vdc->get_features = virtio_input_get_features; 323 vdc->set_status = virtio_input_set_status; 324 vdc->reset = virtio_input_reset; 325 } 326 327 static const TypeInfo virtio_input_info = { 328 .name = TYPE_VIRTIO_INPUT, 329 .parent = TYPE_VIRTIO_DEVICE, 330 .instance_size = sizeof(VirtIOInput), 331 .class_size = sizeof(VirtIOInputClass), 332 .class_init = virtio_input_class_init, 333 .abstract = true, 334 .instance_finalize = virtio_input_finalize, 335 }; 336 337 /* ----------------------------------------------------------------- */ 338 339 static void virtio_register_types(void) 340 { 341 type_register_static(&virtio_input_info); 342 } 343 344 type_init(virtio_register_types) 345