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