virtio-input: emulated devices [device]

This patch adds the virtio-input-hid base class and
virtio-{keyboard,mouse,tablet} subclasses building on the base class.
They are hooked up to the qemu input core and deliver input events
to the guest like all other hid devices (ps/2 kbd, usb tablet, ...).

Using them is as simple as adding "-device virtio-tablet-device" to
your command line, for use all transports except pci.  virtio-pci
support comes as separate patch, once virtio-pci got virtio 1.0
support.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

2 files changed, 503 insertions, 0 deletions

diff --git a/hw/input/Makefile.objs b/hw/input/Makefile.objs
index ee8bba9013..0dae71052d 100644
--- a/hw/input/Makefile.objs
+++ b/hw/input/Makefile.objs
@@ -10,6 +10,7 @@ common-obj-$(CONFIG_VMMOUSE) += vmmouse.o
 
 ifeq ($(CONFIG_LINUX),y)
 common-obj-$(CONFIG_VIRTIO) += virtio-input.o
+common-obj-$(CONFIG_VIRTIO) += virtio-input-hid.o
 endif
 
 obj-$(CONFIG_MILKYMIST) += milkymist-softusb.o
diff --git a/hw/input/virtio-input-hid.c b/hw/input/virtio-input-hid.c
new file mode 100644
index 0000000000..32cc94af0b
--- /dev/null
+++ b/hw/input/virtio-input-hid.c
@@ -0,0 +1,502 @@
+/*
+ * 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"
+
+#undef CONFIG_CURSES
+#include "ui/console.h"
+
+#include "standard-headers/linux/input.h"
+
+#define VIRTIO_ID_NAME_KEYBOARD "QEMU Virtio Keyboard"
+#define VIRTIO_ID_NAME_MOUSE    "QEMU Virtio Mouse"
+#define VIRTIO_ID_NAME_TABLET   "QEMU Virtio Tablet"
+
+/* ----------------------------------------------------------------- */
+
+static const unsigned int keymap_qcode[Q_KEY_CODE_MAX] = {
+    [Q_KEY_CODE_ESC]                 = KEY_ESC,
+    [Q_KEY_CODE_1]                   = KEY_1,
+    [Q_KEY_CODE_2]                   = KEY_2,
+    [Q_KEY_CODE_3]                   = KEY_3,
+    [Q_KEY_CODE_4]                   = KEY_4,
+    [Q_KEY_CODE_5]                   = KEY_5,
+    [Q_KEY_CODE_6]                   = KEY_6,
+    [Q_KEY_CODE_7]                   = KEY_7,
+    [Q_KEY_CODE_8]                   = KEY_8,
+    [Q_KEY_CODE_9]                   = KEY_9,
+    [Q_KEY_CODE_0]                   = KEY_0,
+    [Q_KEY_CODE_MINUS]               = KEY_MINUS,
+    [Q_KEY_CODE_EQUAL]               = KEY_EQUAL,
+    [Q_KEY_CODE_BACKSPACE]           = KEY_BACKSPACE,
+
+    [Q_KEY_CODE_TAB]                 = KEY_TAB,
+    [Q_KEY_CODE_Q]                   = KEY_Q,
+    [Q_KEY_CODE_W]                   = KEY_W,
+    [Q_KEY_CODE_E]                   = KEY_E,
+    [Q_KEY_CODE_R]                   = KEY_R,
+    [Q_KEY_CODE_T]                   = KEY_T,
+    [Q_KEY_CODE_Y]                   = KEY_Y,
+    [Q_KEY_CODE_U]                   = KEY_U,
+    [Q_KEY_CODE_I]                   = KEY_I,
+    [Q_KEY_CODE_O]                   = KEY_O,
+    [Q_KEY_CODE_P]                   = KEY_P,
+    [Q_KEY_CODE_BRACKET_LEFT]        = KEY_LEFTBRACE,
+    [Q_KEY_CODE_BRACKET_RIGHT]       = KEY_RIGHTBRACE,
+    [Q_KEY_CODE_RET]                 = KEY_ENTER,
+
+    [Q_KEY_CODE_CTRL]                = KEY_LEFTCTRL,
+    [Q_KEY_CODE_A]                   = KEY_A,
+    [Q_KEY_CODE_S]                   = KEY_S,
+    [Q_KEY_CODE_D]                   = KEY_D,
+    [Q_KEY_CODE_F]                   = KEY_F,
+    [Q_KEY_CODE_G]                   = KEY_G,
+    [Q_KEY_CODE_H]                   = KEY_H,
+    [Q_KEY_CODE_J]                   = KEY_J,
+    [Q_KEY_CODE_K]                   = KEY_K,
+    [Q_KEY_CODE_L]                   = KEY_L,
+    [Q_KEY_CODE_SEMICOLON]           = KEY_SEMICOLON,
+    [Q_KEY_CODE_APOSTROPHE]          = KEY_APOSTROPHE,
+    [Q_KEY_CODE_GRAVE_ACCENT]        = KEY_GRAVE,
+
+    [Q_KEY_CODE_SHIFT]               = KEY_LEFTSHIFT,
+    [Q_KEY_CODE_BACKSLASH]           = KEY_BACKSLASH,
+    [Q_KEY_CODE_LESS]                = KEY_102ND,
+    [Q_KEY_CODE_Z]                   = KEY_Z,
+    [Q_KEY_CODE_X]                   = KEY_X,
+    [Q_KEY_CODE_C]                   = KEY_C,
+    [Q_KEY_CODE_V]                   = KEY_V,
+    [Q_KEY_CODE_B]                   = KEY_B,
+    [Q_KEY_CODE_N]                   = KEY_N,
+    [Q_KEY_CODE_M]                   = KEY_M,
+    [Q_KEY_CODE_COMMA]               = KEY_COMMA,
+    [Q_KEY_CODE_DOT]                 = KEY_DOT,
+    [Q_KEY_CODE_SLASH]               = KEY_SLASH,
+    [Q_KEY_CODE_SHIFT_R]             = KEY_RIGHTSHIFT,
+
+    [Q_KEY_CODE_ALT]                 = KEY_LEFTALT,
+    [Q_KEY_CODE_SPC]                 = KEY_SPACE,
+    [Q_KEY_CODE_CAPS_LOCK]           = KEY_CAPSLOCK,
+
+    [Q_KEY_CODE_F1]                  = KEY_F1,
+    [Q_KEY_CODE_F2]                  = KEY_F2,
+    [Q_KEY_CODE_F3]                  = KEY_F3,
+    [Q_KEY_CODE_F4]                  = KEY_F4,
+    [Q_KEY_CODE_F5]                  = KEY_F5,
+    [Q_KEY_CODE_F6]                  = KEY_F6,
+    [Q_KEY_CODE_F7]                  = KEY_F7,
+    [Q_KEY_CODE_F8]                  = KEY_F8,
+    [Q_KEY_CODE_F9]                  = KEY_F9,
+    [Q_KEY_CODE_F10]                 = KEY_F10,
+    [Q_KEY_CODE_NUM_LOCK]            = KEY_NUMLOCK,
+    [Q_KEY_CODE_SCROLL_LOCK]         = KEY_SCROLLLOCK,
+
+    [Q_KEY_CODE_KP_0]                = KEY_KP0,
+    [Q_KEY_CODE_KP_1]                = KEY_KP1,
+    [Q_KEY_CODE_KP_2]                = KEY_KP2,
+    [Q_KEY_CODE_KP_3]                = KEY_KP3,
+    [Q_KEY_CODE_KP_4]                = KEY_KP4,
+    [Q_KEY_CODE_KP_5]                = KEY_KP5,
+    [Q_KEY_CODE_KP_6]                = KEY_KP6,
+    [Q_KEY_CODE_KP_7]                = KEY_KP7,
+    [Q_KEY_CODE_KP_8]                = KEY_KP8,
+    [Q_KEY_CODE_KP_9]                = KEY_KP9,
+    [Q_KEY_CODE_KP_SUBTRACT]         = KEY_KPMINUS,
+    [Q_KEY_CODE_KP_ADD]              = KEY_KPPLUS,
+    [Q_KEY_CODE_KP_DECIMAL]          = KEY_KPDOT,
+    [Q_KEY_CODE_KP_ENTER]            = KEY_KPENTER,
+    [Q_KEY_CODE_KP_DIVIDE]           = KEY_KPSLASH,
+    [Q_KEY_CODE_KP_MULTIPLY]         = KEY_KPASTERISK,
+
+    [Q_KEY_CODE_F11]                 = KEY_F11,
+    [Q_KEY_CODE_F12]                 = KEY_F12,
+
+    [Q_KEY_CODE_CTRL_R]              = KEY_RIGHTCTRL,
+    [Q_KEY_CODE_SYSRQ]               = KEY_SYSRQ,
+    [Q_KEY_CODE_ALT_R]               = KEY_RIGHTALT,
+
+    [Q_KEY_CODE_HOME]                = KEY_HOME,
+    [Q_KEY_CODE_UP]                  = KEY_UP,
+    [Q_KEY_CODE_PGUP]                = KEY_PAGEUP,
+    [Q_KEY_CODE_LEFT]                = KEY_LEFT,
+    [Q_KEY_CODE_RIGHT]               = KEY_RIGHT,
+    [Q_KEY_CODE_END]                 = KEY_END,
+    [Q_KEY_CODE_DOWN]                = KEY_DOWN,
+    [Q_KEY_CODE_PGDN]                = KEY_PAGEDOWN,
+    [Q_KEY_CODE_INSERT]              = KEY_INSERT,
+    [Q_KEY_CODE_DELETE]              = KEY_DELETE,
+
+    [Q_KEY_CODE_META_L]              = KEY_LEFTMETA,
+    [Q_KEY_CODE_META_R]              = KEY_RIGHTMETA,
+    [Q_KEY_CODE_MENU]                = KEY_MENU,
+};
+
+static const unsigned int keymap_button[INPUT_BUTTON_MAX] = {
+    [INPUT_BUTTON_LEFT]              = BTN_LEFT,
+    [INPUT_BUTTON_RIGHT]             = BTN_RIGHT,
+    [INPUT_BUTTON_MIDDLE]            = BTN_MIDDLE,
+    [INPUT_BUTTON_WHEEL_UP]          = BTN_GEAR_UP,
+    [INPUT_BUTTON_WHEEL_DOWN]        = BTN_GEAR_DOWN,
+};
+
+static const unsigned int axismap_rel[INPUT_AXIS_MAX] = {
+    [INPUT_AXIS_X]                   = REL_X,
+    [INPUT_AXIS_Y]                   = REL_Y,
+};
+
+static const unsigned int axismap_abs[INPUT_AXIS_MAX] = {
+    [INPUT_AXIS_X]                   = ABS_X,
+    [INPUT_AXIS_Y]                   = ABS_Y,
+};
+
+/* ----------------------------------------------------------------- */
+
+static void virtio_input_key_config(VirtIOInput *vinput,
+                                    const unsigned int *keymap,
+                                    size_t mapsize)
+{
+    virtio_input_config keys;
+    int i, bit, byte, bmax = 0;
+
+    memset(&keys, 0, sizeof(keys));
+    for (i = 0; i < mapsize; i++) {
+        bit = keymap[i];
+        if (!bit) {
+            continue;
+        }
+        byte = bit / 8;
+        bit  = bit % 8;
+        keys.u.bitmap[byte] |= (1 << bit);
+        if (bmax < byte+1) {
+            bmax = byte+1;
+        }
+    }
+    keys.select = VIRTIO_INPUT_CFG_EV_BITS;
+    keys.subsel = EV_KEY;
+    keys.size   = bmax;
+    virtio_input_add_config(vinput, &keys);
+}
+
+static void virtio_input_handle_event(DeviceState *dev, QemuConsole *src,
+                                      InputEvent *evt)
+{
+    VirtIOInput *vinput = VIRTIO_INPUT(dev);
+    virtio_input_event event;
+    int qcode;
+
+    switch (evt->kind) {
+    case INPUT_EVENT_KIND_KEY:
+        qcode = qemu_input_key_value_to_qcode(evt->key->key);
+        if (qcode && keymap_qcode[qcode]) {
+            event.type  = cpu_to_le16(EV_KEY);
+            event.code  = cpu_to_le16(keymap_qcode[qcode]);
+            event.value = cpu_to_le32(evt->key->down ? 1 : 0);
+            virtio_input_send(vinput, &event);
+        } else {
+            if (evt->key->down) {
+                fprintf(stderr, "%s: unmapped key: %d [%s]\n", __func__,
+                        qcode, QKeyCode_lookup[qcode]);
+            }
+        }
+        break;
+    case INPUT_EVENT_KIND_BTN:
+        if (keymap_button[evt->btn->button]) {
+            event.type  = cpu_to_le16(EV_KEY);
+            event.code  = cpu_to_le16(keymap_button[evt->btn->button]);
+            event.value = cpu_to_le32(evt->btn->down ? 1 : 0);
+            virtio_input_send(vinput, &event);
+        } else {
+            if (evt->btn->down) {
+                fprintf(stderr, "%s: unmapped button: %d [%s]\n", __func__,
+                        evt->btn->button, InputButton_lookup[evt->btn->button]);
+            }
+        }
+        break;
+    case INPUT_EVENT_KIND_REL:
+        event.type  = cpu_to_le16(EV_REL);
+        event.code  = cpu_to_le16(axismap_rel[evt->rel->axis]);
+        event.value = cpu_to_le32(evt->rel->value);
+        virtio_input_send(vinput, &event);
+        break;
+    case INPUT_EVENT_KIND_ABS:
+        event.type  = cpu_to_le16(EV_ABS);
+        event.code  = cpu_to_le16(axismap_abs[evt->abs->axis]);
+        event.value = cpu_to_le32(evt->abs->value);
+        virtio_input_send(vinput, &event);
+        break;
+    default:
+        /* keep gcc happy */
+        break;
+    }
+}
+
+static void virtio_input_handle_sync(DeviceState *dev)
+{
+    VirtIOInput *vinput = VIRTIO_INPUT(dev);
+    virtio_input_event event = {
+        .type  = cpu_to_le16(EV_SYN),
+        .code  = cpu_to_le16(SYN_REPORT),
+        .value = 0,
+    };
+
+    virtio_input_send(vinput, &event);
+}
+
+static void virtio_input_hid_realize(DeviceState *dev, Error **errp)
+{
+    VirtIOInputHID *vhid = VIRTIO_INPUT_HID(dev);
+    vhid->hs = qemu_input_handler_register(dev, vhid->handler);
+}
+
+static void virtio_input_hid_unrealize(DeviceState *dev, Error **errp)
+{
+    VirtIOInputHID *vhid = VIRTIO_INPUT_HID(dev);
+    qemu_input_handler_unregister(vhid->hs);
+}
+
+static void virtio_input_hid_change_active(VirtIOInput *vinput)
+{
+    VirtIOInputHID *vhid = VIRTIO_INPUT_HID(vinput);
+
+    if (vinput->active) {
+        qemu_input_handler_activate(vhid->hs);
+    } else {
+        qemu_input_handler_deactivate(vhid->hs);
+    }
+}
+
+static void virtio_input_hid_handle_status(VirtIOInput *vinput,
+                                           virtio_input_event *event)
+{
+    VirtIOInputHID *vhid = VIRTIO_INPUT_HID(vinput);
+    int ledbit = 0;
+
+    switch (le16_to_cpu(event->type)) {
+    case EV_LED:
+        if (event->code == LED_NUML) {
+            ledbit = QEMU_NUM_LOCK_LED;
+        } else if (event->code == LED_CAPSL) {
+            ledbit = QEMU_CAPS_LOCK_LED;
+        } else if (event->code == LED_SCROLLL) {
+            ledbit = QEMU_SCROLL_LOCK_LED;
+        }
+        if (event->value) {
+            vhid->ledstate |= ledbit;
+        } else {
+            vhid->ledstate &= ~ledbit;
+        }
+        kbd_put_ledstate(vhid->ledstate);
+        break;
+    default:
+        fprintf(stderr, "%s: unknown type %d\n", __func__,
+                le16_to_cpu(event->type));
+        break;
+    }
+}
+
+static void virtio_input_hid_class_init(ObjectClass *klass, void *data)
+{
+    VirtIOInputClass *vic = VIRTIO_INPUT_CLASS(klass);
+
+    vic->realize       = virtio_input_hid_realize;
+    vic->unrealize     = virtio_input_hid_unrealize;
+    vic->change_active = virtio_input_hid_change_active;
+    vic->handle_status = virtio_input_hid_handle_status;
+}
+
+static const TypeInfo virtio_input_hid_info = {
+    .name          = TYPE_VIRTIO_INPUT_HID,
+    .parent        = TYPE_VIRTIO_INPUT,
+    .instance_size = sizeof(VirtIOInputHID),
+    .class_init    = virtio_input_hid_class_init,
+    .abstract      = true,
+};
+
+/* ----------------------------------------------------------------- */
+
+static QemuInputHandler virtio_keyboard_handler = {
+    .name  = VIRTIO_ID_NAME_KEYBOARD,
+    .mask  = INPUT_EVENT_MASK_KEY,
+    .event = virtio_input_handle_event,
+    .sync  = virtio_input_handle_sync,
+};
+
+static struct virtio_input_config virtio_keyboard_config[] = {
+    {
+        .select    = VIRTIO_INPUT_CFG_ID_NAME,
+        .size      = sizeof(VIRTIO_ID_NAME_KEYBOARD),
+        .u.string  = VIRTIO_ID_NAME_KEYBOARD,
+    },{
+        .select    = VIRTIO_INPUT_CFG_ID_DEVIDS,
+        .size      = sizeof(struct virtio_input_devids),
+        .u.ids     = {
+            .bustype = const_le16(BUS_VIRTUAL),
+            .vendor  = const_le16(0x0627), /* same we use for usb hid devices */
+            .product = const_le16(0x0001),
+            .version = const_le16(0x0001),
+        },
+    },{
+        .select    = VIRTIO_INPUT_CFG_EV_BITS,
+        .subsel    = EV_REP,
+        .size      = 1,
+    },{
+        .select    = VIRTIO_INPUT_CFG_EV_BITS,
+        .subsel    = EV_LED,
+        .size      = 1,
+        .u.bitmap  = {
+            (1 << LED_NUML) | (1 << LED_CAPSL) | (1 << LED_SCROLLL),
+        },
+    },
+    { /* end of list */ },
+};
+
+static void virtio_keyboard_init(Object *obj)
+{
+    VirtIOInputHID *vhid = VIRTIO_INPUT_HID(obj);
+    VirtIOInput *vinput = VIRTIO_INPUT(obj);
+
+    vhid->handler = &virtio_keyboard_handler;
+    virtio_input_init_config(vinput, virtio_keyboard_config);
+    virtio_input_key_config(vinput, keymap_qcode,
+                            ARRAY_SIZE(keymap_qcode));
+}
+
+static const TypeInfo virtio_keyboard_info = {
+    .name          = TYPE_VIRTIO_KEYBOARD,
+    .parent        = TYPE_VIRTIO_INPUT_HID,
+    .instance_size = sizeof(VirtIOInputHID),
+    .instance_init = virtio_keyboard_init,
+};
+
+/* ----------------------------------------------------------------- */
+
+static QemuInputHandler virtio_mouse_handler = {
+    .name  = VIRTIO_ID_NAME_MOUSE,
+    .mask  = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_REL,
+    .event = virtio_input_handle_event,
+    .sync  = virtio_input_handle_sync,
+};
+
+static struct virtio_input_config virtio_mouse_config[] = {
+    {
+        .select    = VIRTIO_INPUT_CFG_ID_NAME,
+        .size      = sizeof(VIRTIO_ID_NAME_MOUSE),
+        .u.string  = VIRTIO_ID_NAME_MOUSE,
+    },{
+        .select    = VIRTIO_INPUT_CFG_ID_DEVIDS,
+        .size      = sizeof(struct virtio_input_devids),
+        .u.ids     = {
+            .bustype = const_le16(BUS_VIRTUAL),
+            .vendor  = const_le16(0x0627), /* same we use for usb hid devices */
+            .product = const_le16(0x0002),
+            .version = const_le16(0x0001),
+        },
+    },{
+        .select    = VIRTIO_INPUT_CFG_EV_BITS,
+        .subsel    = EV_REL,
+        .size      = 1,
+        .u.bitmap  = {
+            (1 << REL_X) | (1 << REL_Y),
+        },
+    },
+    { /* end of list */ },
+};
+
+static void virtio_mouse_init(Object *obj)
+{
+    VirtIOInputHID *vhid = VIRTIO_INPUT_HID(obj);
+    VirtIOInput *vinput = VIRTIO_INPUT(obj);
+
+    vhid->handler = &virtio_mouse_handler;
+    virtio_input_init_config(vinput, virtio_mouse_config);
+    virtio_input_key_config(vinput, keymap_button,
+                            ARRAY_SIZE(keymap_button));
+}
+
+static const TypeInfo virtio_mouse_info = {
+    .name          = TYPE_VIRTIO_MOUSE,
+    .parent        = TYPE_VIRTIO_INPUT_HID,
+    .instance_size = sizeof(VirtIOInputHID),
+    .instance_init = virtio_mouse_init,
+};
+
+/* ----------------------------------------------------------------- */
+
+static QemuInputHandler virtio_tablet_handler = {
+    .name  = VIRTIO_ID_NAME_TABLET,
+    .mask  = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_ABS,
+    .event = virtio_input_handle_event,
+    .sync  = virtio_input_handle_sync,
+};
+
+static struct virtio_input_config virtio_tablet_config[] = {
+    {
+        .select    = VIRTIO_INPUT_CFG_ID_NAME,
+        .size      = sizeof(VIRTIO_ID_NAME_TABLET),
+        .u.string  = VIRTIO_ID_NAME_TABLET,
+    },{
+        .select    = VIRTIO_INPUT_CFG_ID_DEVIDS,
+        .size      = sizeof(struct virtio_input_devids),
+        .u.ids     = {
+            .bustype = const_le16(BUS_VIRTUAL),
+            .vendor  = const_le16(0x0627), /* same we use for usb hid devices */
+            .product = const_le16(0x0003),
+            .version = const_le16(0x0001),
+        },
+    },{
+        .select    = VIRTIO_INPUT_CFG_EV_BITS,
+        .subsel    = EV_ABS,
+        .size      = 1,
+        .u.bitmap  = {
+            (1 << ABS_X) | (1 << ABS_Y),
+        },
+    },{
+        .select    = VIRTIO_INPUT_CFG_ABS_INFO,
+        .subsel    = ABS_X,
+        .size      = sizeof(virtio_input_absinfo),
+        .u.abs.max = const_le32(INPUT_EVENT_ABS_SIZE),
+    },{
+        .select    = VIRTIO_INPUT_CFG_ABS_INFO,
+        .subsel    = ABS_Y,
+        .size      = sizeof(virtio_input_absinfo),
+        .u.abs.max = const_le32(INPUT_EVENT_ABS_SIZE),
+    },
+    { /* end of list */ },
+};
+
+static void virtio_tablet_init(Object *obj)
+{
+    VirtIOInputHID *vhid = VIRTIO_INPUT_HID(obj);
+    VirtIOInput *vinput = VIRTIO_INPUT(obj);
+
+    vhid->handler = &virtio_tablet_handler;
+    virtio_input_init_config(vinput, virtio_tablet_config);
+    virtio_input_key_config(vinput, keymap_button,
+                            ARRAY_SIZE(keymap_button));
+}
+
+static const TypeInfo virtio_tablet_info = {
+    .name          = TYPE_VIRTIO_TABLET,
+    .parent        = TYPE_VIRTIO_INPUT_HID,
+    .instance_size = sizeof(VirtIOInputHID),
+    .instance_init = virtio_tablet_init,
+};
+
+/* ----------------------------------------------------------------- */
+
+static void virtio_register_types(void)
+{
+    type_register_static(&virtio_input_hid_info);
+    type_register_static(&virtio_keyboard_info);
+    type_register_static(&virtio_mouse_info);
+    type_register_static(&virtio_tablet_info);
+}
+
+type_init(virtio_register_types)