qemu/hw/input/virtio-input-host.c
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   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-common.h"
   8#include "qemu/sockets.h"
   9
  10#include "hw/qdev.h"
  11#include "hw/virtio/virtio.h"
  12#include "hw/virtio/virtio-input.h"
  13
  14#include <sys/ioctl.h>
  15#include "standard-headers/linux/input.h"
  16
  17/* ----------------------------------------------------------------- */
  18
  19static struct virtio_input_config virtio_input_host_config[] = {
  20    { /* empty list */ },
  21};
  22
  23static void virtio_input_host_event(void *opaque)
  24{
  25    VirtIOInputHost *vih = opaque;
  26    VirtIOInput *vinput = VIRTIO_INPUT(vih);
  27    struct virtio_input_event virtio;
  28    struct input_event evdev;
  29    int rc;
  30
  31    for (;;) {
  32        rc = read(vih->fd, &evdev, sizeof(evdev));
  33        if (rc != sizeof(evdev)) {
  34            break;
  35        }
  36
  37        virtio.type  = cpu_to_le16(evdev.type);
  38        virtio.code  = cpu_to_le16(evdev.code);
  39        virtio.value = cpu_to_le32(evdev.value);
  40        virtio_input_send(vinput, &virtio);
  41    }
  42}
  43
  44static void virtio_input_bits_config(VirtIOInputHost *vih,
  45                                     int type, int count)
  46{
  47    virtio_input_config bits;
  48    int rc, i, size = 0;
  49
  50    memset(&bits, 0, sizeof(bits));
  51    rc = ioctl(vih->fd, EVIOCGBIT(type, count/8), bits.u.bitmap);
  52    if (rc < 0) {
  53        return;
  54    }
  55
  56    for (i = 0; i < count/8; i++) {
  57        if (bits.u.bitmap[i]) {
  58            size = i+1;
  59        }
  60    }
  61    if (size == 0) {
  62        return;
  63    }
  64
  65    bits.select = VIRTIO_INPUT_CFG_EV_BITS;
  66    bits.subsel = type;
  67    bits.size   = size;
  68    virtio_input_add_config(VIRTIO_INPUT(vih), &bits);
  69}
  70
  71static void virtio_input_host_realize(DeviceState *dev, Error **errp)
  72{
  73    VirtIOInputHost *vih = VIRTIO_INPUT_HOST(dev);
  74    VirtIOInput *vinput = VIRTIO_INPUT(dev);
  75    virtio_input_config id;
  76    struct input_id ids;
  77    int rc, ver;
  78
  79    if (!vih->evdev) {
  80        error_setg(errp, "evdev property is required");
  81        return;
  82    }
  83
  84    vih->fd = open(vih->evdev, O_RDWR);
  85    if (vih->fd < 0)  {
  86        error_setg_file_open(errp, errno, vih->evdev);
  87        return;
  88    }
  89    qemu_set_nonblock(vih->fd);
  90
  91    rc = ioctl(vih->fd, EVIOCGVERSION, &ver);
  92    if (rc < 0) {
  93        error_setg(errp, "%s: is not an evdev device", vih->evdev);
  94        goto err_close;
  95    }
  96
  97    rc = ioctl(vih->fd, EVIOCGRAB, 1);
  98    if (rc < 0) {
  99        error_setg_errno(errp, errno, "%s: failed to get exclusive access",
 100                         vih->evdev);
 101        goto err_close;
 102    }
 103
 104    memset(&id, 0, sizeof(id));
 105    ioctl(vih->fd, EVIOCGNAME(sizeof(id.u.string)-1), id.u.string);
 106    id.select = VIRTIO_INPUT_CFG_ID_NAME;
 107    id.size = strlen(id.u.string);
 108    virtio_input_add_config(vinput, &id);
 109
 110    if (ioctl(vih->fd, EVIOCGID, &ids) == 0) {
 111        memset(&id, 0, sizeof(id));
 112        id.select = VIRTIO_INPUT_CFG_ID_DEVIDS;
 113        id.size = sizeof(struct virtio_input_devids);
 114        id.u.ids.bustype = cpu_to_le16(ids.bustype);
 115        id.u.ids.vendor  = cpu_to_le16(ids.vendor);
 116        id.u.ids.product = cpu_to_le16(ids.product);
 117        id.u.ids.version = cpu_to_le16(ids.version);
 118        virtio_input_add_config(vinput, &id);
 119    }
 120
 121    virtio_input_bits_config(vih, EV_KEY, KEY_CNT);
 122    virtio_input_bits_config(vih, EV_REL, REL_CNT);
 123    virtio_input_bits_config(vih, EV_ABS, ABS_CNT);
 124    virtio_input_bits_config(vih, EV_MSC, MSC_CNT);
 125    virtio_input_bits_config(vih, EV_SW,  SW_CNT);
 126
 127    qemu_set_fd_handler(vih->fd, virtio_input_host_event, NULL, vih);
 128    return;
 129
 130err_close:
 131    close(vih->fd);
 132    vih->fd = -1;
 133    return;
 134}
 135
 136static void virtio_input_host_unrealize(DeviceState *dev, Error **errp)
 137{
 138    VirtIOInputHost *vih = VIRTIO_INPUT_HOST(dev);
 139
 140    if (vih->fd > 0) {
 141        qemu_set_fd_handler(vih->fd, NULL, NULL, NULL);
 142        close(vih->fd);
 143    }
 144}
 145
 146static const VMStateDescription vmstate_virtio_input_host = {
 147    .name = "virtio-input-host",
 148    .unmigratable = 1,
 149};
 150
 151static Property virtio_input_host_properties[] = {
 152    DEFINE_PROP_STRING("evdev", VirtIOInputHost, evdev),
 153    DEFINE_PROP_END_OF_LIST(),
 154};
 155
 156static void virtio_input_host_class_init(ObjectClass *klass, void *data)
 157{
 158    VirtIOInputClass *vic = VIRTIO_INPUT_CLASS(klass);
 159    DeviceClass *dc = DEVICE_CLASS(klass);
 160
 161    dc->vmsd           = &vmstate_virtio_input_host;
 162    dc->props          = virtio_input_host_properties;
 163    vic->realize       = virtio_input_host_realize;
 164    vic->unrealize     = virtio_input_host_unrealize;
 165}
 166
 167static void virtio_input_host_init(Object *obj)
 168{
 169    VirtIOInput *vinput = VIRTIO_INPUT(obj);
 170
 171    virtio_input_init_config(vinput, virtio_input_host_config);
 172}
 173
 174static const TypeInfo virtio_input_host_info = {
 175    .name          = TYPE_VIRTIO_INPUT_HOST,
 176    .parent        = TYPE_VIRTIO_INPUT,
 177    .instance_size = sizeof(VirtIOInputHost),
 178    .instance_init = virtio_input_host_init,
 179    .class_init    = virtio_input_host_class_init,
 180};
 181
 182/* ----------------------------------------------------------------- */
 183
 184static void virtio_register_types(void)
 185{
 186    type_register_static(&virtio_input_host_info);
 187}
 188
 189type_init(virtio_register_types)
 190