hw/virtio/vhost-user-gpio.c

   1 /*
   2  * Vhost-user GPIO virtio device
   3  *
   4  * Copyright (c) 2022 Viresh Kumar <viresh.kumar@linaro.org>
   5  *
   6  * SPDX-License-Identifier: GPL-2.0-or-later
   7  */
   8
   9 #include "qemu/osdep.h"
  10 #include "qapi/error.h"
  11 #include "hw/qdev-properties.h"
  12 #include "hw/virtio/virtio-bus.h"
  13 #include "hw/virtio/vhost-user-gpio.h"
  14 #include "standard-headers/linux/virtio_ids.h"
  15 #include "standard-headers/linux/virtio_gpio.h"
  16
  17 static Property vgpio_properties[] = {
  18     DEFINE_PROP_CHR("chardev", VHostUserBase, chardev),
  19     DEFINE_PROP_END_OF_LIST(),
  20 };
  21
  22 static void vgpio_realize(DeviceState *dev, Error **errp)
  23 {
  24     VHostUserBase *vub = VHOST_USER_BASE(dev);
  25     VHostUserBaseClass *vubc = VHOST_USER_BASE_GET_CLASS(dev);
  26
  27     /* Fixed for GPIO */
  28     vub->virtio_id = VIRTIO_ID_GPIO;
  29     vub->num_vqs = 2;
  30     vub->config_size = sizeof(struct virtio_gpio_config);
  31
  32     vubc->parent_realize(dev, errp);
  33 }
  34
  35 static const VMStateDescription vu_gpio_vmstate = {
  36     .name = "vhost-user-gpio",
  37     .unmigratable = 1,
  38 };
  39
  40 static void vu_gpio_class_init(ObjectClass *klass, void *data)
  41 {
  42     DeviceClass *dc = DEVICE_CLASS(klass);
  43     VHostUserBaseClass *vubc = VHOST_USER_BASE_CLASS(klass);
  44
  45     dc->vmsd = &vu_gpio_vmstate;
  46     device_class_set_props(dc, vgpio_properties);
  47     device_class_set_parent_realize(dc, vgpio_realize,
  48                                     &vubc->parent_realize);
  49     set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
  50 }
  51
  52 static const TypeInfo vu_gpio_info = {
  53     .name = TYPE_VHOST_USER_GPIO,
  54     .parent = TYPE_VHOST_USER_BASE,
  55     .instance_size = sizeof(VHostUserGPIO),
  56     .class_init = vu_gpio_class_init,
  57 };
  58
  59 static void vu_gpio_register_types(void)
  60 {
  61     type_register_static(&vu_gpio_info);
  62 }
  63
  64 type_init(vu_gpio_register_types)