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qemu/ui/input-linux.c
Gerd Hoffmann a6ccabd676 input-linux: add switch to enable auto-repeat events 
Enable with "-input-linux /dev/input/${device},repeat=on".

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 1457087116-4379-4-git-send-email-kraxel@redhat.com
2016-03-08 12:20:11 +01:00

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12 KiB
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/*
* 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/osdep.h"
#include "qemu-common.h"
#include "qemu/config-file.h"
#include "qemu/sockets.h"
#include "sysemu/sysemu.h"
#include "ui/input.h"
#include <sys/ioctl.h>
#include "standard-headers/linux/input.h"
static int linux_to_qcode[KEY_CNT] = {
[KEY_ESC] = Q_KEY_CODE_ESC,
[KEY_1] = Q_KEY_CODE_1,
[KEY_2] = Q_KEY_CODE_2,
[KEY_3] = Q_KEY_CODE_3,
[KEY_4] = Q_KEY_CODE_4,
[KEY_5] = Q_KEY_CODE_5,
[KEY_6] = Q_KEY_CODE_6,
[KEY_7] = Q_KEY_CODE_7,
[KEY_8] = Q_KEY_CODE_8,
[KEY_9] = Q_KEY_CODE_9,
[KEY_0] = Q_KEY_CODE_0,
[KEY_MINUS] = Q_KEY_CODE_MINUS,
[KEY_EQUAL] = Q_KEY_CODE_EQUAL,
[KEY_BACKSPACE] = Q_KEY_CODE_BACKSPACE,
[KEY_TAB] = Q_KEY_CODE_TAB,
[KEY_Q] = Q_KEY_CODE_Q,
[KEY_W] = Q_KEY_CODE_W,
[KEY_E] = Q_KEY_CODE_E,
[KEY_R] = Q_KEY_CODE_R,
[KEY_T] = Q_KEY_CODE_T,
[KEY_Y] = Q_KEY_CODE_Y,
[KEY_U] = Q_KEY_CODE_U,
[KEY_I] = Q_KEY_CODE_I,
[KEY_O] = Q_KEY_CODE_O,
[KEY_P] = Q_KEY_CODE_P,
[KEY_LEFTBRACE] = Q_KEY_CODE_BRACKET_LEFT,
[KEY_RIGHTBRACE] = Q_KEY_CODE_BRACKET_RIGHT,
[KEY_ENTER] = Q_KEY_CODE_RET,
[KEY_LEFTCTRL] = Q_KEY_CODE_CTRL,
[KEY_A] = Q_KEY_CODE_A,
[KEY_S] = Q_KEY_CODE_S,
[KEY_D] = Q_KEY_CODE_D,
[KEY_F] = Q_KEY_CODE_F,
[KEY_G] = Q_KEY_CODE_G,
[KEY_H] = Q_KEY_CODE_H,
[KEY_J] = Q_KEY_CODE_J,
[KEY_K] = Q_KEY_CODE_K,
[KEY_L] = Q_KEY_CODE_L,
[KEY_SEMICOLON] = Q_KEY_CODE_SEMICOLON,
[KEY_APOSTROPHE] = Q_KEY_CODE_APOSTROPHE,
[KEY_GRAVE] = Q_KEY_CODE_GRAVE_ACCENT,
[KEY_LEFTSHIFT] = Q_KEY_CODE_SHIFT,
[KEY_BACKSLASH] = Q_KEY_CODE_BACKSLASH,
[KEY_102ND] = Q_KEY_CODE_LESS,
[KEY_Z] = Q_KEY_CODE_Z,
[KEY_X] = Q_KEY_CODE_X,
[KEY_C] = Q_KEY_CODE_C,
[KEY_V] = Q_KEY_CODE_V,
[KEY_B] = Q_KEY_CODE_B,
[KEY_N] = Q_KEY_CODE_N,
[KEY_M] = Q_KEY_CODE_M,
[KEY_COMMA] = Q_KEY_CODE_COMMA,
[KEY_DOT] = Q_KEY_CODE_DOT,
[KEY_SLASH] = Q_KEY_CODE_SLASH,
[KEY_RIGHTSHIFT] = Q_KEY_CODE_SHIFT_R,
[KEY_LEFTALT] = Q_KEY_CODE_ALT,
[KEY_SPACE] = Q_KEY_CODE_SPC,
[KEY_CAPSLOCK] = Q_KEY_CODE_CAPS_LOCK,
[KEY_F1] = Q_KEY_CODE_F1,
[KEY_F2] = Q_KEY_CODE_F2,
[KEY_F3] = Q_KEY_CODE_F3,
[KEY_F4] = Q_KEY_CODE_F4,
[KEY_F5] = Q_KEY_CODE_F5,
[KEY_F6] = Q_KEY_CODE_F6,
[KEY_F7] = Q_KEY_CODE_F7,
[KEY_F8] = Q_KEY_CODE_F8,
[KEY_F9] = Q_KEY_CODE_F9,
[KEY_F10] = Q_KEY_CODE_F10,
[KEY_NUMLOCK] = Q_KEY_CODE_NUM_LOCK,
[KEY_SCROLLLOCK] = Q_KEY_CODE_SCROLL_LOCK,
[KEY_KP0] = Q_KEY_CODE_KP_0,
[KEY_KP1] = Q_KEY_CODE_KP_1,
[KEY_KP2] = Q_KEY_CODE_KP_2,
[KEY_KP3] = Q_KEY_CODE_KP_3,
[KEY_KP4] = Q_KEY_CODE_KP_4,
[KEY_KP5] = Q_KEY_CODE_KP_5,
[KEY_KP6] = Q_KEY_CODE_KP_6,
[KEY_KP7] = Q_KEY_CODE_KP_7,
[KEY_KP8] = Q_KEY_CODE_KP_8,
[KEY_KP9] = Q_KEY_CODE_KP_9,
[KEY_KPMINUS] = Q_KEY_CODE_KP_SUBTRACT,
[KEY_KPPLUS] = Q_KEY_CODE_KP_ADD,
[KEY_KPDOT] = Q_KEY_CODE_KP_DECIMAL,
[KEY_KPENTER] = Q_KEY_CODE_KP_ENTER,
[KEY_KPSLASH] = Q_KEY_CODE_KP_DIVIDE,
[KEY_KPASTERISK] = Q_KEY_CODE_KP_MULTIPLY,
[KEY_F11] = Q_KEY_CODE_F11,
[KEY_F12] = Q_KEY_CODE_F12,
[KEY_RIGHTCTRL] = Q_KEY_CODE_CTRL_R,
[KEY_SYSRQ] = Q_KEY_CODE_SYSRQ,
[KEY_RIGHTALT] = Q_KEY_CODE_ALT_R,
[KEY_HOME] = Q_KEY_CODE_HOME,
[KEY_UP] = Q_KEY_CODE_UP,
[KEY_PAGEUP] = Q_KEY_CODE_PGUP,
[KEY_LEFT] = Q_KEY_CODE_LEFT,
[KEY_RIGHT] = Q_KEY_CODE_RIGHT,
[KEY_END] = Q_KEY_CODE_END,
[KEY_DOWN] = Q_KEY_CODE_DOWN,
[KEY_PAGEDOWN] = Q_KEY_CODE_PGDN,
[KEY_INSERT] = Q_KEY_CODE_INSERT,
[KEY_DELETE] = Q_KEY_CODE_DELETE,
[KEY_LEFTMETA] = Q_KEY_CODE_META_L,
[KEY_RIGHTMETA] = Q_KEY_CODE_META_R,
[KEY_MENU] = Q_KEY_CODE_MENU,
};
static int qemu_input_linux_to_qcode(unsigned int lnx)
{
assert(lnx < KEY_CNT);
return linux_to_qcode[lnx];
}
typedef struct InputLinux InputLinux;
struct InputLinux {
const char *evdev;
int fd;
bool repeat;
bool grab_request;
bool grab_active;
bool grab_all;
bool keydown[KEY_CNT];
int keycount;
int wheel;
QTAILQ_ENTRY(InputLinux) next;
};
static QTAILQ_HEAD(, InputLinux) inputs = QTAILQ_HEAD_INITIALIZER(inputs);
static void input_linux_toggle_grab(InputLinux *il)
{
intptr_t request = !il->grab_active;
InputLinux *item;
int rc;
rc = ioctl(il->fd, EVIOCGRAB, request);
if (rc < 0) {
return;
}
il->grab_active = !il->grab_active;
if (!il->grab_all) {
return;
}
QTAILQ_FOREACH(item, &inputs, next) {
if (item == il || item->grab_all) {
/* avoid endless loops */
continue;
}
if (item->grab_active != il->grab_active) {
input_linux_toggle_grab(item);
}
}
}
static void input_linux_event_keyboard(void *opaque)
{
InputLinux *il = opaque;
struct input_event event;
int rc;
for (;;) {
rc = read(il->fd, &event, sizeof(event));
if (rc != sizeof(event)) {
if (rc < 0 && errno != EAGAIN) {
fprintf(stderr, "%s: read: %s\n", __func__, strerror(errno));
qemu_set_fd_handler(il->fd, NULL, NULL, NULL);
close(il->fd);
}
break;
}
switch (event.type) {
case EV_KEY:
if (event.value > 2 || (event.value > 1 && !il->repeat)) {
/*
* ignore autorepeat + unknown key events
* 0 == up, 1 == down, 2 == autorepeat, other == undefined
*/
continue;
}
/* keep track of key state */
if (!il->keydown[event.code] && event.value) {
il->keydown[event.code] = true;
il->keycount++;
}
if (il->keydown[event.code] && !event.value) {
il->keydown[event.code] = false;
il->keycount--;
}
/* send event to guest when grab is active */
if (il->grab_active) {
int qcode = qemu_input_linux_to_qcode(event.code);
qemu_input_event_send_key_qcode(NULL, qcode, event.value);
}
/* hotkey -> record switch request ... */
if (il->keydown[KEY_LEFTCTRL] &&
il->keydown[KEY_RIGHTCTRL]) {
il->grab_request = true;
}
/*
* ... and do the switch when all keys are lifted, so we
* confuse neither guest nor host with keys which seem to
* be stuck due to missing key-up events.
*/
if (il->grab_request && !il->keycount) {
il->grab_request = false;
input_linux_toggle_grab(il);
}
break;
}
}
}
static void input_linux_event_mouse_button(int button)
{
qemu_input_queue_btn(NULL, button, true);
qemu_input_event_sync();
qemu_input_queue_btn(NULL, button, false);
qemu_input_event_sync();
}
static void input_linux_event_mouse(void *opaque)
{
InputLinux *il = opaque;
struct input_event event;
int rc;
for (;;) {
rc = read(il->fd, &event, sizeof(event));
if (rc != sizeof(event)) {
if (rc < 0 && errno != EAGAIN) {
fprintf(stderr, "%s: read: %s\n", __func__, strerror(errno));
qemu_set_fd_handler(il->fd, NULL, NULL, NULL);
close(il->fd);
}
break;
}
/* only send event to guest when grab is active */
if (!il->grab_active) {
continue;
}
switch (event.type) {
case EV_KEY:
switch (event.code) {
case BTN_LEFT:
qemu_input_queue_btn(NULL, INPUT_BUTTON_LEFT, event.value);
break;
case BTN_RIGHT:
qemu_input_queue_btn(NULL, INPUT_BUTTON_RIGHT, event.value);
break;
case BTN_MIDDLE:
qemu_input_queue_btn(NULL, INPUT_BUTTON_MIDDLE, event.value);
break;
case BTN_GEAR_UP:
qemu_input_queue_btn(NULL, INPUT_BUTTON_WHEEL_UP, event.value);
break;
case BTN_GEAR_DOWN:
qemu_input_queue_btn(NULL, INPUT_BUTTON_WHEEL_DOWN,
event.value);
break;
};
break;
case EV_REL:
switch (event.code) {
case REL_X:
qemu_input_queue_rel(NULL, INPUT_AXIS_X, event.value);
break;
case REL_Y:
qemu_input_queue_rel(NULL, INPUT_AXIS_Y, event.value);
break;
case REL_WHEEL:
il->wheel = event.value;
break;
}
break;
case EV_SYN:
qemu_input_event_sync();
if (il->wheel != 0) {
input_linux_event_mouse_button((il->wheel > 0)
? INPUT_BUTTON_WHEEL_UP
: INPUT_BUTTON_WHEEL_DOWN);
il->wheel = 0;
}
break;
}
}
}
int input_linux_init(void *opaque, QemuOpts *opts, Error **errp)
{
InputLinux *il = g_new0(InputLinux, 1);
uint32_t evtmap;
int rc, ver;
il->evdev = qemu_opt_get(opts, "evdev");
il->grab_all = qemu_opt_get_bool(opts, "grab-all", false);
il->repeat = qemu_opt_get_bool(opts, "repeat", false);
if (!il->evdev) {
error_setg(errp, "no input device specified");
goto err_free;
}
il->fd = open(il->evdev, O_RDWR);
if (il->fd < 0) {
error_setg_file_open(errp, errno, il->evdev);
goto err_free;
}
qemu_set_nonblock(il->fd);
rc = ioctl(il->fd, EVIOCGVERSION, &ver);
if (rc < 0) {
error_setg(errp, "%s: is not an evdev device", il->evdev);
goto err_close;
}
rc = ioctl(il->fd, EVIOCGBIT(0, sizeof(evtmap)), &evtmap);
if (evtmap & (1 << EV_REL)) {
/* has relative axis -> assume mouse */
qemu_set_fd_handler(il->fd, input_linux_event_mouse, NULL, il);
} else if (evtmap & (1 << EV_ABS)) {
/* has absolute axis -> not supported */
error_setg(errp, "tablet/touchscreen not supported");
goto err_close;
} else if (evtmap & (1 << EV_KEY)) {
/* has keys/buttons (and no axis) -> assume keyboard */
qemu_set_fd_handler(il->fd, input_linux_event_keyboard, NULL, il);
} else {
/* Huh? What is this? */
error_setg(errp, "unknown kind of input device");
goto err_close;
}
input_linux_toggle_grab(il);
QTAILQ_INSERT_TAIL(&inputs, il, next);
return 0;
err_close:
close(il->fd);
err_free:
g_free(il);
return -1;
}
static QemuOptsList qemu_input_linux_opts = {
.name = "input-linux",
.head = QTAILQ_HEAD_INITIALIZER(qemu_input_linux_opts.head),
.implied_opt_name = "evdev",
.desc = {
{
.name = "evdev",
.type = QEMU_OPT_STRING,
},{
.name = "grab-all",
.type = QEMU_OPT_BOOL,
},{
.name = "repeat",
.type = QEMU_OPT_BOOL,
},
{ /* end of list */ }
},
};
static void input_linux_register_config(void)
{
qemu_add_opts(&qemu_input_linux_opts);
}
machine_init(input_linux_register_config);
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