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