Attachment 181754 Details for Bug 218627 – add an Evdev ioctl handler to the Linux compat layer

[patch] add an Evdev ioctl handler to the Linux compat layer

evdev-linux-compat.patch (text/plain), 4.36 KB, created by Jan Kokemüller on 2017-04-13 11:21:41 UTC

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Creator: Jan Kokemüller

Created: 2017-04-13 11:21:41 UTC

Size: 4.36 KB

patch

obsolete

>diff --git a/sys/compat/linux/linux_ioctl.c b/sys/compat/linux/linux_ioctl.c
>index de5ad41..0810648 100644
>--- a/sys/compat/linux/linux_ioctl.c
>+++ b/sys/compat/linux/linux_ioctl.c
>@@ -70,6 +70,7 @@ __FBSDID("$FreeBSD$");
> #include <net/if_dl.h>
> #include <net/if_types.h>
> 
>+#include <dev/evdev/input.h>
> #include <dev/usb/usb_ioctl.h>
> 
> #ifdef COMPAT_LINUX32
>@@ -83,6 +84,7 @@ __FBSDID("$FreeBSD$");
> #include <compat/linux/linux_ioctl.h>
> #include <compat/linux/linux_mib.h>
> #include <compat/linux/linux_socket.h>
>+#include <compat/linux/linux_timer.h>
> #include <compat/linux/linux_util.h>
> 
> #include <contrib/v4l/videodev.h>
>@@ -110,6 +112,7 @@ static linux_ioctl_function_t linux_ioctl_v4l;
> static linux_ioctl_function_t linux_ioctl_v4l2;
> static linux_ioctl_function_t linux_ioctl_special;
> static linux_ioctl_function_t linux_ioctl_fbsd_usb;
>+static linux_ioctl_function_t linux_ioctl_evdev;
> 
> static struct linux_ioctl_handler cdrom_handler =
> { linux_ioctl_cdrom, LINUX_IOCTL_CDROM_MIN, LINUX_IOCTL_CDROM_MAX };
>@@ -139,6 +142,8 @@ static struct linux_ioctl_handler video2_handler =
> { linux_ioctl_v4l2, LINUX_IOCTL_VIDEO2_MIN, LINUX_IOCTL_VIDEO2_MAX };
> static struct linux_ioctl_handler fbsd_usb =
> { linux_ioctl_fbsd_usb, FBSD_LUSB_MIN, FBSD_LUSB_MAX };
>+static struct linux_ioctl_handler evdev_handler =
>+{ linux_ioctl_evdev, LINUX_IOCTL_EVDEV_MIN, LINUX_IOCTL_EVDEV_MAX };
> 
> DATA_SET(linux_ioctl_handler_set, cdrom_handler);
> DATA_SET(linux_ioctl_handler_set, vfat_handler);
>@@ -154,6 +159,7 @@ DATA_SET(linux_ioctl_handler_set, sg_handler);
> DATA_SET(linux_ioctl_handler_set, video_handler);
> DATA_SET(linux_ioctl_handler_set, video2_handler);
> DATA_SET(linux_ioctl_handler_set, fbsd_usb);
>+DATA_SET(linux_ioctl_handler_set, evdev_handler);
> 
> struct handler_element
> {
>@@ -3563,6 +3569,88 @@ linux_ioctl_fbsd_usb(struct thread *td, struct linux_ioctl_args *args)
> }
> 
> /*
>+ * Some evdev ioctls are defined in a weird way on Linux.
>+ * We need to translate them.
>+ *  - EVIOCGMTSLOTS is a IOC_READ ioctl on Linux although it has input data
>+ *    (must be IOC_INOUT on FreeBSD).
>+ *  - EVIOCGRAB and EVIOCREVOKE are defined as IOC_WRITE with an int argument.
>+ *    They don't read from an int, however, but make their decisions based on
>+ *    the value of the _pointer_ argument.
>+ */
>+static int
>+linux_ioctl_evdev(struct thread *td, struct linux_ioctl_args *args)
>+{
>+	int error;
>+	int clock;
>+	cap_rights_t rights;
>+	struct file *fp;
>+
>+	args->cmd = SETDIR(args->cmd);
>+
>+	switch (args->cmd) {
>+	case (EVIOCGRAB & ~IOC_DIRMASK) | IOC_IN | (sizeof(int) << 16):
>+		/*
>+		 * The length field of the new args->cmd must be zero to
>+		 * properly pass along the value of the data pointer for cuse
>+		 * based evdev devices (look at the comment in
>+		 * cuse_client_ioctl() from sys/fs/cuse/cuse.c).
>+		 */
>+		args->cmd = EVIOCGRAB;
>+		break;
>+	case (EVIOCREVOKE & ~IOC_DIRMASK) | IOC_IN | (sizeof(int) << 16):
>+		args->cmd = EVIOCREVOKE;
>+		break;
>+	case EVIOCSCLOCKID: {
>+		error = copyin((void *)args->arg, &clock, sizeof(clock));
>+		if (error) {
>+			return (error);
>+		}
>+
>+		switch (clock) {
>+		case LINUX_CLOCK_REALTIME:
>+			clock = CLOCK_REALTIME;
>+			break;
>+		case LINUX_CLOCK_MONOTONIC:
>+			clock = CLOCK_MONOTONIC;
>+			break;
>+		case LINUX_CLOCK_BOOTTIME:
>+			/*
>+			 * TODO: FreeBSD does not have an equivalent to Linux'
>+			 * CLOCK_BOOTTIME. Map it to CLOCK_MONOTONIC for now.
>+			 */
>+			clock = CLOCK_MONOTONIC;
>+			break;
>+		default:
>+			return (-EINVAL);
>+		}
>+
>+		error = fget(
>+		    td, args->fd, cap_rights_init(&rights, CAP_IOCTL), &fp);
>+		if (error) {
>+			return (error);
>+		}
>+
>+		error = fo_ioctl(
>+		    fp, EVIOCSCLOCKID, (caddr_t)&clock, td->td_ucred, td);
>+
>+		fdrop(fp, td);
>+
>+		return (error);
>+	}
>+	default:
>+		break;
>+	}
>+
>+	if (IOCBASECMD(args->cmd) ==
>+	    ((EVIOCGMTSLOTS(0) & ~IOC_DIRMASK) | IOC_OUT)) {
>+		args->cmd = (args->cmd & ~IOC_DIRMASK) | IOC_INOUT;
>+	}
>+
>+	error = (sys_ioctl(td, (struct ioctl_args *)args));
>+	return (error);
>+}
>+
>+/*
>  * main ioctl syscall function
>  */
> 
>diff --git a/sys/compat/linux/linux_ioctl.h b/sys/compat/linux/linux_ioctl.h
>index 873937d..1da0ec3 100644
>--- a/sys/compat/linux/linux_ioctl.h
>+++ b/sys/compat/linux/linux_ioctl.h
>@@ -749,6 +749,11 @@
>  */
> #define LINUX_BTRFS_IOC_CLONE		0x9409 /* 0x40049409 */
> 
>+/*
>+ * Linux evdev ioctl min and max
>+ */
>+#define LINUX_IOCTL_EVDEV_MIN		0x4500
>+#define LINUX_IOCTL_EVDEV_MAX		0x45ff
> 
> /*
>  * Pluggable ioctl handlers

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Attachments on bug 218627: 181754 | 181846