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Implement device type discovery using ioctl calls

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This commit implements device type discovery by calling two ioctls
(DRM_IOCTL_VERSION and EVIOCGVERSION) on the device. These iocts are
specific to drm and input devices respectively, therefore we can
determine the device type based on which one returns an error.
This commit is contained in:
sghctoma 2018-09-07 16:37:25 +02:00
parent bbeed1bd31
commit 7a5d3c4d3b
2 changed files with 15 additions and 29 deletions
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34
backend/session/direct-freebsd.c
View file

@ -15,6 +15,7 @@
#include <wayland-server.h>
#include <wlr/backend/session/interface.h>
#include <wlr/util/log.h>
#include <xf86drm.h>
#include "backend/session/direct-ipc.h"
#include "util/signal.h"
@ -47,24 +48,11 @@ static int direct_session_open(struct wlr_session *base, const char *path) {
static void direct_session_close(struct wlr_session *base, int fd) {
struct direct_session *session = wl_container_of(base, session, base);
struct stat st;
if (fstat(fd, &st) < 0) {
wlr_log_errno(WLR_ERROR, "Stat failed");
close(fd);
return;
}
char *name;
name = devname(st.st_rdev, S_IFCHR);
if (name == NULL) {
wlr_log_errno(WLR_ERROR, "Failed to get device name");
close(fd);
return;
}
if (strncmp(name, "drm/", 4) == 0) {
int ev;
struct drm_version dv = {0};
if (ioctl(fd, DRM_IOCTL_VERSION, &dv) == 0) {
direct_ipc_dropmaster(session->sock, fd);
} else if (strncmp(name, "input/event", 11)) {
} else if (ioctl(fd, EVIOCGVERSION, &ev) == 0) {
ioctl(fd, EVIOCREVOKE, 0);
}
@ -104,16 +92,15 @@ static void direct_session_destroy(struct wlr_session *base) {
static int vt_handler(int signo, void *data) {
struct direct_session *session = data;
struct drm_version dv = {0};
struct wlr_device *dev;
if (session->base.active) {
session->base.active = false;
wlr_signal_emit_safe(&session->base.session_signal, session);
char *name;
struct wlr_device *dev;
wl_list_for_each(dev, &session->base.devices, link) {
name = devname(dev->dev, S_IFCHR);
if (name != NULL && strncmp(name, "drm/", 4) == 0) {
if (ioctl(dev->fd, DRM_IOCTL_VERSION, &dv) == 0) {
direct_ipc_dropmaster(session->sock, dev->fd);
}
}
@ -122,11 +109,8 @@ static int vt_handler(int signo, void *data) {
} else {
ioctl(session->tty_fd, VT_RELDISP, VT_ACKACQ);
char *name;
struct wlr_device *dev;
wl_list_for_each(dev, &session->base.devices, link) {
name = devname(dev->dev, S_IFCHR);
if (name != NULL && strncmp(name, "drm/", 4) == 0) {
if (ioctl(dev->fd, DRM_IOCTL_VERSION, &dv) == 0) {
direct_ipc_setmaster(session->sock, dev->fd);
}
}

10
backend/session/direct-ipc.c
View file

@ -3,6 +3,7 @@
#define __BSD_VISIBLE 1
#define INPUT_MAJOR 0
#endif
#include <dev/evdev/input.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
@ -159,14 +160,15 @@ static void communicate(int sock) {
ret = errno;
}
#else
if (strncmp(msg.path, "/dev/drm/", 9) &&
strncmp(msg.path, "/dev/input/event", 16)) {
int ev;
struct drm_version dv = {0};
if (ioctl(fd, EVIOCGVERSION, &ev) == -1 &&
ioctl(fd, DRM_IOCTL_VERSION, &dv) == -1) {
ret = ENOTSUP;
goto error;
}
if (strncmp(msg.path, "/dev/drm/", 9) == 0 && drmSetMaster(fd)) {
if (dv.version_major != 0 && drmSetMaster(fd)) {
ret = errno;
}
#endif