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 "qemu/iov.h"
   9
  10 #include "hw/qdev.h"
  11 #include "hw/virtio/virtio.h"
  12 #include "hw/virtio/virtio-input.h"
  13
  14 #include "standard-headers/linux/input.h"
  15
  16 /* ----------------------------------------------------------------- */
  17
  18 void virtio_input_send(VirtIOInput *vinput, virtio_input_event *event)
  19 {
  20     VirtQueueElement elem;
  21     unsigned have, need;
  22     int i, len;
  23
  24     if (!vinput->active) {
  25         return;
  26     }
  27
  28     /* queue up events ... */
  29     if (vinput->qindex == vinput->qsize) {
  30         vinput->qsize++;
  31         vinput->queue = realloc(vinput->queue, vinput->qsize *
  32                                 sizeof(virtio_input_event));
  33     }
  34     vinput->queue[vinput->qindex++] = *event;
  35
  36     /* ... until we see a report sync ... */
  37     if (event->type != cpu_to_le16(EV_SYN) ||
  38         event->code != cpu_to_le16(SYN_REPORT)) {
  39         return;
  40     }
  41
  42     /* ... then check available space ... */
  43     need = sizeof(virtio_input_event) * vinput->qindex;
  44     virtqueue_get_avail_bytes(vinput->evt, &have, NULL, need, 0);
  45     if (have < need) {
  46         vinput->qindex = 0;
  47         fprintf(stderr, "%s: ENOSPC in vq, dropping events\n", __func__);
  48         return;
  49     }
  50
  51     /* ... and finally pass them to the guest */
  52     for (i = 0; i < vinput->qindex; i++) {
  53         if (!virtqueue_pop(vinput->evt, &elem)) {
  54             /* should not happen, we've checked for space beforehand */
  55             fprintf(stderr, "%s: Huh?  No vq elem available ...\n", __func__);
  56             return;
  57         }
  58         len = iov_from_buf(elem.in_sg, elem.in_num,
  59                            0, vinput->queue+i, sizeof(virtio_input_event));
  60         virtqueue_push(vinput->evt, &elem, len);
  61     }
  62     virtio_notify(VIRTIO_DEVICE(vinput), vinput->evt);
  63     vinput->qindex = 0;
  64 }
  65
  66 static void virtio_input_handle_evt(VirtIODevice *vdev, VirtQueue *vq)
  67 {
  68     /* nothing */
  69 }
  70
  71 static void virtio_input_handle_sts(VirtIODevice *vdev, VirtQueue *vq)
  72 {
  73     VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vdev);
  74     VirtIOInput *vinput = VIRTIO_INPUT(vdev);
  75     virtio_input_event event;
  76     VirtQueueElement elem;
  77     int len;
  78
  79     while (virtqueue_pop(vinput->sts, &elem)) {
  80         memset(&event, 0, sizeof(event));
  81         len = iov_to_buf(elem.out_sg, elem.out_num,
  82                          0, &event, sizeof(event));
  83         if (vic->handle_status) {
  84             vic->handle_status(vinput, &event);
  85         }
  86         virtqueue_push(vinput->sts, &elem, len);
  87     }
  88     virtio_notify(vdev, vinput->sts);
  89 }
  90
  91 static virtio_input_config *virtio_input_find_config(VirtIOInput *vinput,
  92                                                      uint8_t select,
  93                                                      uint8_t subsel)
  94 {
  95     VirtIOInputConfig *cfg;
  96
  97     QTAILQ_FOREACH(cfg, &vinput->cfg_list, node) {
  98         if (select == cfg->config.select &&
  99             subsel == cfg->config.subsel) {
 100             return &cfg->config;
 101         }
 102     }
 103     return NULL;
 104 }
 105
 106 void virtio_input_add_config(VirtIOInput *vinput,
 107                              virtio_input_config *config)
 108 {
 109     VirtIOInputConfig *cfg;
 110
 111     if (virtio_input_find_config(vinput, config->select, config->subsel)) {
 112         /* should not happen */
 113         fprintf(stderr, "%s: duplicate config: %d/%d\n",
 114                 __func__, config->select, config->subsel);
 115         abort();
 116     }
 117
 118     cfg = g_new0(VirtIOInputConfig, 1);
 119     cfg->config = *config;
 120     QTAILQ_INSERT_TAIL(&vinput->cfg_list, cfg, node);
 121 }
 122
 123 void virtio_input_init_config(VirtIOInput *vinput,
 124                               virtio_input_config *config)
 125 {
 126     int i = 0;
 127
 128     QTAILQ_INIT(&vinput->cfg_list);
 129     while (config[i].select) {
 130         virtio_input_add_config(vinput, config + i);
 131         i++;
 132     }
 133 }
 134
 135 void virtio_input_idstr_config(VirtIOInput *vinput,
 136                                uint8_t select, const char *string)
 137 {
 138     virtio_input_config id;
 139
 140     if (!string) {
 141         return;
 142     }
 143     memset(&id, 0, sizeof(id));
 144     id.select = select;
 145     id.size = snprintf(id.u.string, sizeof(id.u.string), "%s", string);
 146     virtio_input_add_config(vinput, &id);
 147 }
 148
 149 static void virtio_input_get_config(VirtIODevice *vdev, uint8_t *config_data)
 150 {
 151     VirtIOInput *vinput = VIRTIO_INPUT(vdev);
 152     virtio_input_config *config;
 153
 154     config = virtio_input_find_config(vinput, vinput->cfg_select,
 155                                       vinput->cfg_subsel);
 156     if (config) {
 157         memcpy(config_data, config, vinput->cfg_size);
 158     } else {
 159         memset(config_data, 0, vinput->cfg_size);
 160     }
 161 }
 162
 163 static void virtio_input_set_config(VirtIODevice *vdev,
 164                                     const uint8_t *config_data)
 165 {
 166     VirtIOInput *vinput = VIRTIO_INPUT(vdev);
 167     virtio_input_config *config = (virtio_input_config *)config_data;
 168
 169     vinput->cfg_select = config->select;
 170     vinput->cfg_subsel = config->subsel;
 171     virtio_notify_config(vdev);
 172 }
 173
 174 static uint64_t virtio_input_get_features(VirtIODevice *vdev, uint64_t f,
 175                                           Error **errp)
 176 {
 177     return f;
 178 }
 179
 180 static void virtio_input_set_status(VirtIODevice *vdev, uint8_t val)
 181 {
 182     VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vdev);
 183     VirtIOInput *vinput = VIRTIO_INPUT(vdev);
 184
 185     if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
 186         if (!vinput->active) {
 187             vinput->active = true;
 188             if (vic->change_active) {
 189                 vic->change_active(vinput);
 190             }
 191         }
 192     }
 193 }
 194
 195 static void virtio_input_reset(VirtIODevice *vdev)
 196 {
 197     VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vdev);
 198     VirtIOInput *vinput = VIRTIO_INPUT(vdev);
 199
 200     if (vinput->active) {
 201         vinput->active = false;
 202         if (vic->change_active) {
 203             vic->change_active(vinput);
 204         }
 205     }
 206 }
 207
 208 static void virtio_input_device_realize(DeviceState *dev, Error **errp)
 209 {
 210     VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(dev);
 211     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
 212     VirtIOInput *vinput = VIRTIO_INPUT(dev);
 213     VirtIOInputConfig *cfg;
 214     Error *local_err = NULL;
 215
 216     if (vic->realize) {
 217         vic->realize(dev, &local_err);
 218         if (local_err) {
 219             error_propagate(errp, local_err);
 220             return;
 221         }
 222     }
 223
 224     virtio_input_idstr_config(vinput, VIRTIO_INPUT_CFG_ID_SERIAL,
 225                               vinput->serial);
 226
 227     QTAILQ_FOREACH(cfg, &vinput->cfg_list, node) {
 228         if (vinput->cfg_size < cfg->config.size) {
 229             vinput->cfg_size = cfg->config.size;
 230         }
 231     }
 232     vinput->cfg_size += 8;
 233     assert(vinput->cfg_size <= sizeof(virtio_input_config));
 234
 235     virtio_init(vdev, "virtio-input", VIRTIO_ID_INPUT,
 236                 vinput->cfg_size);
 237     vinput->evt = virtio_add_queue(vdev, 64, virtio_input_handle_evt);
 238     vinput->sts = virtio_add_queue(vdev, 64, virtio_input_handle_sts);
 239 }
 240
 241 static void virtio_input_device_unrealize(DeviceState *dev, Error **errp)
 242 {
 243     VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(dev);
 244     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
 245     Error *local_err = NULL;
 246
 247     if (vic->unrealize) {
 248         vic->unrealize(dev, &local_err);
 249         if (local_err) {
 250             error_propagate(errp, local_err);
 251             return;
 252         }
 253     }
 254     virtio_cleanup(vdev);
 255 }
 256
 257 static Property virtio_input_properties[] = {
 258     DEFINE_PROP_STRING("serial", VirtIOInput, serial),
 259     DEFINE_PROP_END_OF_LIST(),
 260 };
 261
 262 static void virtio_input_class_init(ObjectClass *klass, void *data)
 263 {
 264     DeviceClass *dc = DEVICE_CLASS(klass);
 265     VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
 266
 267     dc->props          = virtio_input_properties;
 268     set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
 269     vdc->realize      = virtio_input_device_realize;
 270     vdc->unrealize    = virtio_input_device_unrealize;
 271     vdc->get_config   = virtio_input_get_config;
 272     vdc->set_config   = virtio_input_set_config;
 273     vdc->get_features = virtio_input_get_features;
 274     vdc->set_status   = virtio_input_set_status;
 275     vdc->reset        = virtio_input_reset;
 276 }
 277
 278 static const TypeInfo virtio_input_info = {
 279     .name          = TYPE_VIRTIO_INPUT,
 280     .parent        = TYPE_VIRTIO_DEVICE,
 281     .instance_size = sizeof(VirtIOInput),
 282     .class_size    = sizeof(VirtIOInputClass),
 283     .class_init    = virtio_input_class_init,
 284     .abstract      = true,
 285 };
 286
 287 /* ----------------------------------------------------------------- */
 288
 289 static void virtio_register_types(void)
 290 {
 291     type_register_static(&virtio_input_info);
 292 }
 293
 294 type_init(virtio_register_types)