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/module.h"
  10 #include "qemu/sockets.h"
  11
  12 #include "hw/virtio/virtio.h"
  13 #include "hw/qdev-properties.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_abs_config(VirtIOInputHost *vih, int axis)
  74 {
  75     virtio_input_config config;
  76     struct input_absinfo absinfo;
  77     int rc;
  78
  79     rc = ioctl(vih->fd, EVIOCGABS(axis), &absinfo);
  80     if (rc < 0) {
  81         return;
  82     }
  83
  84     memset(&config, 0, sizeof(config));
  85     config.select = VIRTIO_INPUT_CFG_ABS_INFO;
  86     config.subsel = axis;
  87     config.size   = sizeof(virtio_input_absinfo);
  88
  89     config.u.abs.min  = cpu_to_le32(absinfo.minimum);
  90     config.u.abs.max  = cpu_to_le32(absinfo.maximum);
  91     config.u.abs.fuzz = cpu_to_le32(absinfo.fuzz);
  92     config.u.abs.flat = cpu_to_le32(absinfo.flat);
  93     config.u.abs.res  = cpu_to_le32(absinfo.resolution);
  94
  95     virtio_input_add_config(VIRTIO_INPUT(vih), &config);
  96 }
  97
  98 static void virtio_input_host_realize(DeviceState *dev, Error **errp)
  99 {
 100     VirtIOInputHost *vih = VIRTIO_INPUT_HOST(dev);
 101     VirtIOInput *vinput = VIRTIO_INPUT(dev);
 102     virtio_input_config id, *abs;
 103     struct input_id ids;
 104     int rc, ver, i, axis;
 105     uint8_t byte;
 106
 107     if (!vih->evdev) {
 108         error_setg(errp, "evdev property is required");
 109         return;
 110     }
 111
 112     vih->fd = open(vih->evdev, O_RDWR);
 113     if (vih->fd < 0)  {
 114         error_setg_file_open(errp, errno, vih->evdev);
 115         return;
 116     }
 117     qemu_set_nonblock(vih->fd);
 118
 119     rc = ioctl(vih->fd, EVIOCGVERSION, &ver);
 120     if (rc < 0) {
 121         error_setg(errp, "%s: is not an evdev device", vih->evdev);
 122         goto err_close;
 123     }
 124
 125     rc = ioctl(vih->fd, EVIOCGRAB, 1);
 126     if (rc < 0) {
 127         error_setg_errno(errp, errno, "%s: failed to get exclusive access",
 128                          vih->evdev);
 129         goto err_close;
 130     }
 131
 132     memset(&id, 0, sizeof(id));
 133     ioctl(vih->fd, EVIOCGNAME(sizeof(id.u.string)-1), id.u.string);
 134     id.select = VIRTIO_INPUT_CFG_ID_NAME;
 135     id.size = strlen(id.u.string);
 136     virtio_input_add_config(vinput, &id);
 137
 138     if (ioctl(vih->fd, EVIOCGID, &ids) == 0) {
 139         memset(&id, 0, sizeof(id));
 140         id.select = VIRTIO_INPUT_CFG_ID_DEVIDS;
 141         id.size = sizeof(struct virtio_input_devids);
 142         id.u.ids.bustype = cpu_to_le16(ids.bustype);
 143         id.u.ids.vendor  = cpu_to_le16(ids.vendor);
 144         id.u.ids.product = cpu_to_le16(ids.product);
 145         id.u.ids.version = cpu_to_le16(ids.version);
 146         virtio_input_add_config(vinput, &id);
 147     }
 148
 149     virtio_input_bits_config(vih, EV_KEY, KEY_CNT);
 150     virtio_input_bits_config(vih, EV_REL, REL_CNT);
 151     virtio_input_bits_config(vih, EV_ABS, ABS_CNT);
 152     virtio_input_bits_config(vih, EV_MSC, MSC_CNT);
 153     virtio_input_bits_config(vih, EV_SW,  SW_CNT);
 154     virtio_input_bits_config(vih, EV_LED, LED_CNT);
 155
 156     abs = virtio_input_find_config(VIRTIO_INPUT(vih),
 157         VIRTIO_INPUT_CFG_EV_BITS, EV_ABS);
 158     if (abs) {
 159         for (i = 0; i < abs->size; i++) {
 160             byte = abs->u.bitmap[i];
 161             axis = 8 * i;
 162             while (byte) {
 163                 if (byte & 1) {
 164                     virtio_input_abs_config(vih, axis);
 165                 }
 166                 axis++;
 167                 byte >>= 1;
 168             }
 169         }
 170     }
 171
 172     qemu_set_fd_handler(vih->fd, virtio_input_host_event, NULL, vih);
 173     return;
 174
 175 err_close:
 176     close(vih->fd);
 177     vih->fd = -1;
 178     return;
 179 }
 180
 181 static void virtio_input_host_unrealize(DeviceState *dev, Error **errp)
 182 {
 183     VirtIOInputHost *vih = VIRTIO_INPUT_HOST(dev);
 184
 185     if (vih->fd > 0) {
 186         qemu_set_fd_handler(vih->fd, NULL, NULL, NULL);
 187         close(vih->fd);
 188     }
 189 }
 190
 191 static void virtio_input_host_handle_status(VirtIOInput *vinput,
 192                                             virtio_input_event *event)
 193 {
 194     VirtIOInputHost *vih = VIRTIO_INPUT_HOST(vinput);
 195     struct input_event evdev;
 196     int rc;
 197
 198     if (gettimeofday(&evdev.time, NULL)) {
 199         perror("virtio_input_host_handle_status: gettimeofday");
 200         return;
 201     }
 202
 203     evdev.type = le16_to_cpu(event->type);
 204     evdev.code = le16_to_cpu(event->code);
 205     evdev.value = le32_to_cpu(event->value);
 206
 207     rc = write(vih->fd, &evdev, sizeof(evdev));
 208     if (rc == -1) {
 209         perror("virtio_input_host_handle_status: write");
 210     }
 211 }
 212
 213 static const VMStateDescription vmstate_virtio_input_host = {
 214     .name = "virtio-input-host",
 215     .unmigratable = 1,
 216 };
 217
 218 static Property virtio_input_host_properties[] = {
 219     DEFINE_PROP_STRING("evdev", VirtIOInputHost, evdev),
 220     DEFINE_PROP_END_OF_LIST(),
 221 };
 222
 223 static void virtio_input_host_class_init(ObjectClass *klass, void *data)
 224 {
 225     VirtIOInputClass *vic = VIRTIO_INPUT_CLASS(klass);
 226     DeviceClass *dc = DEVICE_CLASS(klass);
 227
 228     dc->vmsd           = &vmstate_virtio_input_host;
 229     device_class_set_props(dc, virtio_input_host_properties);
 230     vic->realize       = virtio_input_host_realize;
 231     vic->unrealize     = virtio_input_host_unrealize;
 232     vic->handle_status = virtio_input_host_handle_status;
 233 }
 234
 235 static void virtio_input_host_init(Object *obj)
 236 {
 237     VirtIOInput *vinput = VIRTIO_INPUT(obj);
 238
 239     virtio_input_init_config(vinput, virtio_input_host_config);
 240 }
 241
 242 static const TypeInfo virtio_input_host_info = {
 243     .name          = TYPE_VIRTIO_INPUT_HOST,
 244     .parent        = TYPE_VIRTIO_INPUT,
 245     .instance_size = sizeof(VirtIOInputHost),
 246     .instance_init = virtio_input_host_init,
 247     .class_init    = virtio_input_host_class_init,
 248 };
 249
 250 /* ----------------------------------------------------------------- */
 251
 252 static void virtio_register_types(void)
 253 {
 254     type_register_static(&virtio_input_host_info);
 255 }
 256
 257 type_init(virtio_register_types)