drivers: video: shell: introduce the video shell

Introduce the video shell and implement some video shell commands.
Make use of the various querying API to implement tab-completion, and
validiate the data, as well as convert string names into integers.
Commands provided: frmival, format, ctrl, start, stop, capture

Signed-off-by: Josuah Demangeon <me@josuah.net>

Author: josuah

drivers/video/CMakeLists.txt

@@ -8,6 +8,7 @@ zephyr_library_sources(video_device.c)
 
 zephyr_library_sources_ifdef(CONFIG_VIDEO_MCUX_CSI	video_mcux_csi.c)
 zephyr_library_sources_ifdef(CONFIG_VIDEO_MCUX_MIPI_CSI2RX video_mcux_mipi_csi2rx.c)
+zephyr_library_sources_ifdef(CONFIG_VIDEO_SHELL video_shell.c)
 zephyr_library_sources_ifdef(CONFIG_VIDEO_SW_GENERATOR	video_sw_generator.c)
 zephyr_library_sources_ifdef(CONFIG_VIDEO_MT9M114	mt9m114.c)
 zephyr_library_sources_ifdef(CONFIG_VIDEO_OV7725	ov7725.c)

drivers/video/Kconfig

@@ -56,6 +56,8 @@ source "drivers/video/Kconfig.mcux_csi"
 
 source "drivers/video/Kconfig.mcux_mipi_csi2rx"
 
+source "drivers/video/Kconfig.shell"
+
 source "drivers/video/Kconfig.sw_generator"
 
 source "drivers/video/Kconfig.mt9m114"

drivers/video/Kconfig.shell

@@ -0,0 +1,20 @@
+# Copyright The Zephyr Project Contributors
+# SPDX-License-Identifier: Apache-2.0
+
+config VIDEO_SHELL
+	bool "Video shell"
+	depends on SHELL
+	help
+	  This shell provides control and query commands for video drivers.
+
+if VIDEO_SHELL
+
+config VIDEO_SHELL_CTRL_NAME_SIZE
+	int "Maximum size for the control string identifier"
+	default 40
+	help
+	  Video controls have a human-friendly name that is converted into a string identifier.
+	  This Kconfig controls the maximum size of the string identifier after which the name
+	  would be truncated. The default value is enough for all standard control names.
+
+endif