diff options
Diffstat (limited to 'hw/input/virtio-input.c')
| -rw-r--r-- | hw/input/virtio-input.c | 282 |
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) |