man: add weston-drm page

Add some documentation about the DRM backend into its own man page, and
refer to it in weston(1).

Environment variable, that are reserved for backends, and currently used
only by the DRM backend, are moved to weston-drm page.

NOTE: This is a candidate for the stable branch
Signed-off-by: Pekka Paalanen <ppaalanen@gmail.com>

4 files changed, 147 insertions, 16 deletions

diff --git a/man/.gitignore b/man/.gitignore
index 52eaf2bc..dfabd622 100644
--- a/man/.gitignore
+++ b/man/.gitignore
@@ -1,2 +1,3 @@
 weston.1
+weston-drm.7
 
diff --git a/man/Makefile.am b/man/Makefile.am
index 4ff6bc7d..8933f1c9 100644
--- a/man/Makefile.am
+++ b/man/Makefile.am
@@ -1,15 +1,22 @@
 man_MANS = weston.1
 
+if ENABLE_DRM_COMPOSITOR
+man_MANS += weston-drm.7
+endif
+
 MAN_SUBSTS = \
 	-e 's|__weston_native_backend__|$(WESTON_NATIVE_BACKEND)|g' \
 	-e 's|__weston_modules_dir__|$(pkglibdir)|g' \
 	-e 's|__version__|$(PACKAGE_VERSION)|g'
 
-SUFFIXES = .1 .man
+SUFFIXES = .1 .7 .man
 
 .man.1:
 	$(AM_V_GEN)$(SED) $(MAN_SUBSTS) < $< > $@
 
-EXTRA_DIST = weston.man
+.man.7:
+	$(AM_V_GEN)$(SED) $(MAN_SUBSTS) < $< > $@
+
+EXTRA_DIST = weston.man weston-drm.man
 
 CLEANFILES = $(man_MANS)
diff --git a/man/weston-drm.man b/man/weston-drm.man
new file mode 100644
index 00000000..35d62ae6
--- /dev/null
+++ b/man/weston-drm.man
@@ -0,0 +1,130 @@
+.TH WESTON-DRM 7 "2012-11-27" "Weston __version__"
+.SH NAME
+weston-drm \- the DRM backend for Weston
+.SH SYNOPSIS
+.B weston-launch
+.LP
+.B weston --backend=drm-backend.so
+.
+.\" ***************************************************************
+.SH DESCRIPTION
+The DRM backend is the native Weston backend for systems that support
+the Linux kernel DRM, kernel mode setting (KMS), and evdev input devices.
+It is the recommended backend for desktop PCs, and aims to provide
+the full Wayland experience with the "every frame is perfect" concept.
+It also relies on the Mesa GBM interface.
+
+With the DRM backend,
+.B weston
+runs without any underlying windowing system. The backend uses the
+Linux KMS API to detect connected monitors. Monitor hot-plugging is
+supported. Input devices are found automatically by
+.BR udev (7).
+Compositing happens mainly in GL\ ES\ 2, initialized through EGL. It
+is also possible to take advantage of hardware cursors and overlays,
+when they exist and are functional. Full-screen surfaces will be
+scanned out directly without compositing, when possible.
+Hardware accelerated clients are supported via EGL.
+
+The backend chooses the DRM graphics device first based on seat id.
+If seat identifiers are not set, it looks for the graphics device
+that was used in boot. If that is not found, it finally chooses
+the first DRM device returned by
+.BR udev (7).
+Combining multiple graphics devices are not supported yet.
+
+The DRM backend relies on
+.B weston-launch
+for managing input device access and DRM master status, so that
+.B weston
+can be run without root privileges. On switching away from the
+virtual terminal (VT) hosting Weston, all input devices are closed and
+the DRM master capability is dropped, so that other servers,
+including
+.BR Xorg (1),
+can run on other VTs. On switching back to Weston's VT, input devices
+and DRM master are re-acquired through the parent process
+.BR weston-launch .
+.
+.\" ***************************************************************
+.SH CONFIGURATION
+.
+The DRM backend uses the following entries from
+.BR weston.ini .
+.SS Section output
+.TP
+\fBname\fR=\fIconnector\fR
+The KMS connector name identifying the output, for instance
+.IR LVDS1 .
+.TP
+\fBmode\fR=\fImode\fR
+Specify the video mode for the output. The argument
+.I mode
+can be one of the words
+.BR off " to turn the output off, "
+.BR preferred " to use the monitor's preferred video mode, or "
+.BR current " to use the current video mode and avoid a mode switch."
+It can also be a resolution as
+\fIwidth\fBx\fIheight\fR, or a detailed mode line as below.
+.TP
+\fBmode\fR=\fIdotclock hdisp hsyncstart hsyncend htotal \
+vdisp vsyncstart vsyncend vtotal hflag vflag\fR
+Use the given detailed mode line as the video mode for this output.
+The definition is the same as in
+.BR xorg.conf "(5), and " cvt (1)
+can generate detailed mode lines.
+.TP
+\fBtransform\fR=\fItransform\fR
+Transform for the output, which can be rotated in 90-degree steps
+and possibly flipped. Possible values are
+.BR normal ", " 90 ", " 180 ", " 270 ", "
+.BR flipped ", " flipped-90 ", " flipped-180 ", and " flipped-270 .
+.
+.\" ***************************************************************
+.SH OPTIONS
+.
+When the DRM backend is loaded,
+.B weston
+will understand the following additional command line options.
+.TP
+\fB\-\-connector\fR=\fIconnectorid\fR
+Use the connector with id number
+.I connectorid
+as the only initial output.
+.TP
+.B \-\-current\-mode
+By default, use the current video mode of all outputs, instead of
+switching to the monitor preferred mode.
+.TP
+\fB\-\-seat\fR=\fIseatid\fR
+Use graphics and input devices designated for seat
+.I seatid
+instead of the default seat
+.BR seat0 .
+.TP
+\fB\-\-tty\fR=\fIx\fR
+Launch Weston on tty
+.I x
+instead of using the current tty.
+.
+.\" ***************************************************************
+.SH ENVIRONMENT
+.
+.TP
+.B WESTON_TTY_FD
+The file descriptor (integer) of the opened tty where
+.B weston
+will run. Set by
+.BR weston-launch .
+.TP
+.B WESTON_LAUNCHER_SOCK
+The file descriptor (integer) where
+.B weston-launch
+is listening. Automatically set by
+.BR weston-launch .
+.
+.\" ***************************************************************
+.SH "SEE ALSO"
+.BR weston (1)
+.\".BR weston-launch (1),
+.\".BR weston.ini (5)
diff --git a/man/weston.man b/man/weston.man
index efb6d2b4..1bf87d88 100644
--- a/man/weston.man
+++ b/man/weston.man
@@ -30,7 +30,9 @@ Weston also supports X clients via
 .TP
 .I drm-backend.so
 The DRM backend uses Linux KMS for output and evdev devices for input.
-It supports multiple monitors in a unified desktop with DPMS.
+It supports multiple monitors in a unified desktop with DPMS. See
+.BR weston-drm (7),
+if installed.
 .TP
 .I wayland-backend.so
 The Wayland backend runs on another Wayland server, a different Weston
@@ -132,14 +134,8 @@ Weston will export
 with this value in the environment for all child processes to allow them to
 connect to the right server automatically.
 .SS DRM backend options:
-.TP
-\fB\-\-connector\fR=\fIconnectorid\fR
-.TP
-.B \-\-current\-mode
-.TP
-\fB\-\-seat\fR=\fIseatid\fR
-.TP
-\fB\-\-tty\fR=\fItty\fR
+See
+.BR weston-drm (7).
 .
 .SS Wayland backend options:
 .TP
@@ -203,10 +199,6 @@ This allows launching Weston as a nested server.
 .TP
 .B WAYLAND_SOCKET
 .TP
-.B WESTON_TTY_FD
-.TP
-.B WESTON_LAUNCHER_SOCK
-.TP
 .B XCURSOR_PATH
 Set the list of paths to look for cursors in. It changes both
 libwayland-cursor and libXcursor, so it affects both Wayland and X11 based
@@ -251,6 +243,7 @@ WAYLAND_DISPLAY=wayland-0 weston -Swayland-1
 weston
 .
 .\" ***************************************************************
-.\".SH "SEE ALSO"
+.SH "SEE ALSO"
+.BR weston-drm (7)
 .\".BR weston-launch (1),
 .\".BR weston.ini (5)