fb: cfb_shell: Add `draw point` command

Add the `draw point` command to execute the `cfb_draw_point()` API.

This command render single dot.

Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@fujitsu.com>

subsys/fb/cfb_shell.c

diff --git a/subsys/fb/cfb_shell.c b/subsys/fb/cfb_shell.c
index 3758f3d..c872db3 100644
--- a/subsys/fb/cfb_shell.c
+++ b/subsys/fb/cfb_shell.c
@@ -18,6 +18,7 @@
 #define HELP_NONE "[none]"
 #define HELP_INIT "call \"cfb init\" first"
 #define HELP_PRINT "<col: pos> <row: pos> \"<text>\""
+#define HELP_DRAW_POINT "<x> <y0>"
 #define HELP_INVERT "[<x> <y> <width> <height>]"
 
 static const struct device *const dev =
@@ -143,6 +144,30 @@
 	return err;
 }
 
+static int cmd_draw_point(const struct shell *sh, size_t argc, char *argv[])
+{
+	int err;
+	struct cfb_position pos;
+
+	if (!dev) {
+		shell_error(sh, HELP_INIT);
+		return -ENODEV;
+	}
+
+	pos.x = strtol(argv[1], NULL, 10);
+	pos.y = strtol(argv[2], NULL, 10);
+
+	err = cfb_draw_point(dev, &pos);
+	if (err) {
+		shell_error(sh, "Failed point drawing to Framebuffer error=%d", err);
+		return err;
+	}
+
+	err = cfb_framebuffer_finalize(dev);
+
+	return err;
+}
+
 static int cmd_scroll_vert(const struct shell *sh, size_t argc, char *argv[])
 {
 	int err = 0;
@@ -542,6 +567,7 @@
 
 SHELL_STATIC_SUBCMD_SET_CREATE(sub_cmd_draw,
 	SHELL_CMD_ARG(text, NULL, HELP_PRINT, cmd_draw_text, 4, 0),
+	SHELL_CMD_ARG(point, NULL, HELP_DRAW_POINT, cmd_draw_point, 3, 0),
 	SHELL_SUBCMD_SET_END
 );