hw/input/virtio-input.c

   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     unsigned have, need;
  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 = realloc(vinput->queue, vinput->qsize *
  36                                 sizeof(virtio_input_event));
  37     }
  38     vinput->queue[vinput->qindex++] = *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     need = sizeof(virtio_input_event) * vinput->qindex;
  48     virtqueue_get_avail_bytes(vinput->evt, &have, NULL, need, 0);
  49     if (have < need) {
  50         vinput->qindex = 0;
  51         trace_virtio_input_queue_full();
  52         return;
  53     }
  54
  55     /* ... and finally pass them to the guest */
  56     for (i = 0; i < vinput->qindex; i++) {
  57         elem = virtqueue_pop(vinput->evt, sizeof(VirtQueueElement));
  58         if (!elem) {
  59             /* should not happen, we've checked for space beforehand */
  60             fprintf(stderr, "%s: Huh?  No vq elem available ...\n", __func__);
  61             return;
  62         }
  63         len = iov_from_buf(elem->in_sg, elem->in_num,
  64                            0, vinput->queue+i, 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 static void virtio_input_device_unrealize(DeviceState *dev, Error **errp)
 277 {
 278     VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(dev);
 279     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
 280     Error *local_err = NULL;
 281
 282     if (vic->unrealize) {
 283         vic->unrealize(dev, &local_err);
 284         if (local_err) {
 285             error_propagate(errp, local_err);
 286             return;
 287         }
 288     }
 289     virtio_cleanup(vdev);
 290 }
 291
 292 static const VMStateDescription vmstate_virtio_input = {
 293     .name = "virtio-input",
 294     .minimum_version_id = VIRTIO_INPUT_VM_VERSION,
 295     .version_id = VIRTIO_INPUT_VM_VERSION,
 296     .fields = (VMStateField[]) {
 297         VMSTATE_VIRTIO_DEVICE,
 298         VMSTATE_END_OF_LIST()
 299     },
 300     .post_load = virtio_input_post_load,
 301 };
 302
 303 static Property virtio_input_properties[] = {
 304     DEFINE_PROP_STRING("serial", VirtIOInput, serial),
 305     DEFINE_PROP_END_OF_LIST(),
 306 };
 307
 308 static void virtio_input_class_init(ObjectClass *klass, void *data)
 309 {
 310     DeviceClass *dc = DEVICE_CLASS(klass);
 311     VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
 312
 313     dc->props          = virtio_input_properties;
 314     dc->vmsd           = &vmstate_virtio_input;
 315     set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
 316     vdc->realize      = virtio_input_device_realize;
 317     vdc->unrealize    = virtio_input_device_unrealize;
 318     vdc->get_config   = virtio_input_get_config;
 319     vdc->set_config   = virtio_input_set_config;
 320     vdc->get_features = virtio_input_get_features;
 321     vdc->set_status   = virtio_input_set_status;
 322     vdc->reset        = virtio_input_reset;
 323 }
 324
 325 static const TypeInfo virtio_input_info = {
 326     .name          = TYPE_VIRTIO_INPUT,
 327     .parent        = TYPE_VIRTIO_DEVICE,
 328     .instance_size = sizeof(VirtIOInput),
 329     .class_size    = sizeof(VirtIOInputClass),
 330     .class_init    = virtio_input_class_init,
 331     .abstract      = true,
 332     .instance_finalize = virtio_input_finalize,
 333 };
 334
 335 /* ----------------------------------------------------------------- */
 336
 337 static void virtio_register_types(void)
 338 {
 339     type_register_static(&virtio_input_info);
 340 }
 341
 342 type_init(virtio_register_types)