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-rw-r--r--hw/input/virtio-input.c282
1 files changed, 282 insertions, 0 deletions
diff --git a/hw/input/virtio-input.c b/hw/input/virtio-input.c
new file mode 100644
index 0000000..e615c5c
--- /dev/null
+++ b/hw/input/virtio-input.c
@@ -0,0 +1,282 @@
+/*
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * (at your option) any later version. See the COPYING file in the
+ * top-level directory.
+ */
+
+#include "qemu/iov.h"
+
+#include "hw/qdev.h"
+#include "hw/virtio/virtio.h"
+#include "hw/virtio/virtio-input.h"
+
+#include "standard-headers/linux/input.h"
+
+/* ----------------------------------------------------------------- */
+
+void virtio_input_send(VirtIOInput *vinput, virtio_input_event *event)
+{
+ VirtQueueElement elem;
+ unsigned have, need;
+ int i, len;
+
+ /* queue up events ... */
+ if (vinput->qindex == vinput->qsize) {
+ vinput->qsize++;
+ vinput->queue = realloc(vinput->queue, vinput->qsize *
+ sizeof(virtio_input_event));
+ }
+ vinput->queue[vinput->qindex++] = *event;
+
+ /* ... until we see a report sync ... */
+ if (event->type != cpu_to_le16(EV_SYN) ||
+ event->code != cpu_to_le16(SYN_REPORT)) {
+ return;
+ }
+
+ /* ... then check available space ... */
+ need = sizeof(virtio_input_event) * vinput->qindex;
+ virtqueue_get_avail_bytes(vinput->evt, &have, NULL, need, 0);
+ if (have < need) {
+ vinput->qindex = 0;
+ fprintf(stderr, "%s: ENOSPC in vq, dropping events\n", __func__);
+ return;
+ }
+
+ /* ... and finally pass them to the guest */
+ for (i = 0; i < vinput->qindex; i++) {
+ if (!virtqueue_pop(vinput->evt, &elem)) {
+ /* should not happen, we've checked for space beforehand */
+ fprintf(stderr, "%s: Huh? No vq elem available ...\n", __func__);
+ return;
+ }
+ len = iov_from_buf(elem.in_sg, elem.in_num,
+ 0, vinput->queue+i, sizeof(virtio_input_event));
+ virtqueue_push(vinput->evt, &elem, len);
+ }
+ virtio_notify(VIRTIO_DEVICE(vinput), vinput->evt);
+ vinput->qindex = 0;
+}
+
+static void virtio_input_handle_evt(VirtIODevice *vdev, VirtQueue *vq)
+{
+ /* nothing */
+}
+
+static void virtio_input_handle_sts(VirtIODevice *vdev, VirtQueue *vq)
+{
+ VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vdev);
+ VirtIOInput *vinput = VIRTIO_INPUT(vdev);
+ virtio_input_event event;
+ VirtQueueElement elem;
+ int len;
+
+ while (virtqueue_pop(vinput->sts, &elem)) {
+ memset(&event, 0, sizeof(event));
+ len = iov_to_buf(elem.out_sg, elem.out_num,
+ 0, &event, sizeof(event));
+ if (vic->handle_status) {
+ vic->handle_status(vinput, &event);
+ }
+ virtqueue_push(vinput->sts, &elem, len);
+ }
+ virtio_notify(vdev, vinput->sts);
+}
+
+static virtio_input_config *virtio_input_find_config(VirtIOInput *vinput,
+ uint8_t select,
+ uint8_t subsel)
+{
+ VirtIOInputConfig *cfg;
+
+ QTAILQ_FOREACH(cfg, &vinput->cfg_list, node) {
+ if (select == cfg->config.select &&
+ subsel == cfg->config.subsel) {
+ return &cfg->config;
+ }
+ }
+ return NULL;
+}
+
+void virtio_input_add_config(VirtIOInput *vinput,
+ virtio_input_config *config)
+{
+ VirtIOInputConfig *cfg;
+
+ if (virtio_input_find_config(vinput, config->select, config->subsel)) {
+ /* should not happen */
+ fprintf(stderr, "%s: duplicate config: %d/%d\n",
+ __func__, config->select, config->subsel);
+ abort();
+ }
+
+ cfg = g_new0(VirtIOInputConfig, 1);
+ cfg->config = *config;
+ QTAILQ_INSERT_TAIL(&vinput->cfg_list, cfg, node);
+}
+
+void virtio_input_init_config(VirtIOInput *vinput,
+ virtio_input_config *config)
+{
+ int i = 0;
+
+ QTAILQ_INIT(&vinput->cfg_list);
+ while (config[i].select) {
+ virtio_input_add_config(vinput, config + i);
+ i++;
+ }
+}
+
+void virtio_input_idstr_config(VirtIOInput *vinput,
+ uint8_t select, const char *string)
+{
+ virtio_input_config id;
+
+ if (!string) {
+ return;
+ }
+ memset(&id, 0, sizeof(id));
+ id.select = select;
+ id.size = snprintf(id.u.string, sizeof(id.u.string), "%s", string);
+ virtio_input_add_config(vinput, &id);
+}
+
+static void virtio_input_get_config(VirtIODevice *vdev, uint8_t *config_data)
+{
+ VirtIOInput *vinput = VIRTIO_INPUT(vdev);
+ virtio_input_config *config;
+
+ config = virtio_input_find_config(vinput, vinput->cfg_select,
+ vinput->cfg_subsel);
+ if (config) {
+ memcpy(config_data, config, vinput->cfg_size);
+ } else {
+ memset(config_data, 0, vinput->cfg_size);
+ }
+}
+
+static void virtio_input_set_config(VirtIODevice *vdev,
+ const uint8_t *config_data)
+{
+ VirtIOInput *vinput = VIRTIO_INPUT(vdev);
+ virtio_input_config *config = (virtio_input_config *)config_data;
+
+ vinput->cfg_select = config->select;
+ vinput->cfg_subsel = config->subsel;
+ virtio_notify_config(vdev);
+}
+
+static uint32_t virtio_input_get_features(VirtIODevice *vdev, uint32_t f)
+{
+ return f;
+}
+
+static void virtio_input_set_status(VirtIODevice *vdev, uint8_t val)
+{
+ VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vdev);
+ VirtIOInput *vinput = VIRTIO_INPUT(vdev);
+
+ if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
+ if (!vinput->active) {
+ vinput->active = true;
+ if (vic->change_active) {
+ vic->change_active(vinput);
+ }
+ }
+ }
+}
+
+static void virtio_input_reset(VirtIODevice *vdev)
+{
+ VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vdev);
+ VirtIOInput *vinput = VIRTIO_INPUT(vdev);
+
+ if (vinput->active) {
+ vinput->active = false;
+ if (vic->change_active) {
+ vic->change_active(vinput);
+ }
+ }
+}
+
+static void virtio_input_device_realize(DeviceState *dev, Error **errp)
+{
+ VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(dev);
+ VirtIODevice *vdev = VIRTIO_DEVICE(dev);
+ VirtIOInput *vinput = VIRTIO_INPUT(dev);
+ VirtIOInputConfig *cfg;
+ Error *local_err = NULL;
+
+ if (vic->realize) {
+ vic->realize(dev, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return;
+ }
+ }
+
+ virtio_input_idstr_config(vinput, VIRTIO_INPUT_CFG_ID_SERIAL,
+ vinput->input.serial);
+
+ QTAILQ_FOREACH(cfg, &vinput->cfg_list, node) {
+ if (vinput->cfg_size < cfg->config.size) {
+ vinput->cfg_size = cfg->config.size;
+ }
+ }
+ vinput->cfg_size += 8;
+ assert(vinput->cfg_size <= sizeof(virtio_input_config));
+
+ virtio_init(vdev, "virtio-input", VIRTIO_ID_INPUT,
+ vinput->cfg_size);
+ vinput->evt = virtio_add_queue(vdev, 64, virtio_input_handle_evt);
+ vinput->sts = virtio_add_queue(vdev, 64, virtio_input_handle_sts);
+}
+
+static void virtio_input_device_unrealize(DeviceState *dev, Error **errp)
+{
+ VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(dev);
+ VirtIODevice *vdev = VIRTIO_DEVICE(dev);
+ Error *local_err = NULL;
+
+ if (vic->unrealize) {
+ vic->unrealize(dev, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return;
+ }
+ }
+ virtio_cleanup(vdev);
+}
+
+static void virtio_input_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
+
+ set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
+ vdc->realize = virtio_input_device_realize;
+ vdc->unrealize = virtio_input_device_unrealize;
+ vdc->get_config = virtio_input_get_config;
+ vdc->set_config = virtio_input_set_config;
+ vdc->get_features = virtio_input_get_features;
+ vdc->set_status = virtio_input_set_status;
+ vdc->reset = virtio_input_reset;
+}
+
+static const TypeInfo virtio_input_info = {
+ .name = TYPE_VIRTIO_INPUT,
+ .parent = TYPE_VIRTIO_DEVICE,
+ .instance_size = sizeof(VirtIOInput),
+ .class_size = sizeof(VirtIOInputClass),
+ .class_init = virtio_input_class_init,
+ .abstract = true,
+};
+
+/* ----------------------------------------------------------------- */
+
+static void virtio_register_types(void)
+{
+ type_register_static(&virtio_input_info);
+}
+
+type_init(virtio_register_types)