Arm9 hotplug - Revision history

JonSenior: Added LSLive category

JonSenior — Tue, 06 Jan 2009 07:40:12 GMT

Added LSLive category

← Older revision		Revision as of 07:40, 6 January 2009
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-	{{Articles\|LSPro}}	+	{{Articles\|LSPro\|LSLive}}
	Hotplug on ARM9		Hotplug on ARM9
	This article explains (very short) how the hot plug system on the Linkstation Pro (also Live and Terasation Pro/Live - on the ARM9 series)works and shows a simple way to alter it in order to perform custom actions upon hot plugging.		This article explains (very short) how the hot plug system on the Linkstation Pro (also Live and Terasation Pro/Live - on the ARM9 series)works and shows a simple way to alter it in order to perform custom actions upon hot plugging.

JonSenior: /* Example: image downloading */ minor grammar edit.

JonSenior — Tue, 06 Jan 2009 07:38:52 GMT

Example: image downloading: minor grammar edit.

← Older revision		Revision as of 07:38, 6 January 2009
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	Copying is done using gphoto2, jhead evaluates the EXIF tag and calls libjpeg to rotate the JPG's. gphoto2 and libjpeg are available via ipkg from the optware feed, you can find a compiled jhead version (2.8) in the download section (http://downloads.nas-central.org/Uploads/LSPro/Binaries/).		Copying is done using gphoto2, jhead evaluates the EXIF tag and calls libjpeg to rotate the JPG's. gphoto2 and libjpeg are available via ipkg from the optware feed, you can find a compiled jhead version (2.8) in the download section (http://downloads.nas-central.org/Uploads/LSPro/Binaries/).

-	The script for the usb device has to be in /etc/hotplug.d/usb, ~~it's~~ name has to have the form *.hotplug and it has to be executable. It is called from /sbin/hotplug, for my camera the variable $PRODUCT is set to "4a9/313a/2" if this is the case and $ACTION is equal to "add" it's time for action.	+	The script for the usb device has to be in /etc/hotplug.d/usb, its name has to have the form *.hotplug and it has to be executable. It is called from /sbin/hotplug, for my camera the variable $PRODUCT is set to "4a9/313a/2" if this is the case and $ACTION is equal to "add" then it's time for action.

	''Currently the line for deleting the images from the camera (gphoto2 -RD) is commented out - to avoid any trouble in case there's a bug in the script. See the comments!''		''Currently the line for deleting the images from the camera (gphoto2 -RD) is commented out - to avoid any trouble in case there's a bug in the script. See the comments!''

Ramuk at 06:16, 12 March 2008

Ramuk — Wed, 12 Mar 2008 06:16:11 GMT

← Older revision		Revision as of 06:16, 12 March 2008
Line 1:		Line 1:
		+	{{Articles\|LSPro}}
	Hotplug on ARM9		Hotplug on ARM9
	This article explains (very short) how the hot plug system on the Linkstation Pro (also Live and Terasation Pro/Live - on the ARM9 series)works and shows a simple way to alter it in order to perform custom actions upon hot plugging.		This article explains (very short) how the hot plug system on the Linkstation Pro (also Live and Terasation Pro/Live - on the ARM9 series)works and shows a simple way to alter it in order to perform custom actions upon hot plugging.

Georg: /* Example: image downloading */

Georg — Wed, 26 Dec 2007 16:40:06 GMT

Example: image downloading

← Older revision		Revision as of 16:40, 26 December 2007
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	When connecting the camera to the linkstation I want all images (JPG, AVI) to be copied to the hard disk into year/month folders and the photos should be rotated according to the info in the EXIF tag. During operation feedback is given by the info LED, in case of an error the diag LED starts to flash.		When connecting the camera to the linkstation I want all images (JPG, AVI) to be copied to the hard disk into year/month folders and the photos should be rotated according to the info in the EXIF tag. During operation feedback is given by the info LED, in case of an error the diag LED starts to flash.

-	Copying is done using gphoto2, jhead evaluates the EXIF tag and calls libjpeg to rotate the JPG's. gphoto2 and libjpeg are available via ipkg from the optware feed, you can find a compiled jhead version (2.8) in the download section~~. '''~~(~~add link!~~)~~'''~~	+	Copying is done using gphoto2, jhead evaluates the EXIF tag and calls libjpeg to rotate the JPG's. gphoto2 and libjpeg are available via ipkg from the optware feed, you can find a compiled jhead version (2.8) in the download section (http://downloads.nas-central.org/Uploads/LSPro/Binaries/).

	The script for the usb device has to be in /etc/hotplug.d/usb, it's name has to have the form *.hotplug and it has to be executable. It is called from /sbin/hotplug, for my camera the variable $PRODUCT is set to "4a9/313a/2" if this is the case and $ACTION is equal to "add" it's time for action.		The script for the usb device has to be in /etc/hotplug.d/usb, it's name has to have the form *.hotplug and it has to be executable. It is called from /sbin/hotplug, for my camera the variable $PRODUCT is set to "4a9/313a/2" if this is the case and $ACTION is equal to "add" it's time for action.

Georg: /* Example: image downloading */

Georg — Wed, 26 Dec 2007 16:30:30 GMT

Example: image downloading

← Older revision		Revision as of 16:30, 26 December 2007
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	for photo in .JPG .AVI; do		for photo in .JPG .AVI; do
-	if [[ ! -f "$photo" ]]; then	+	if [ ! -f "$photo" ]; then
	# continue with next loop if it's not a file		# continue with next loop if it's not a file
	continue		continue

Georg: /* Example image downloading */

Georg — Wed, 26 Dec 2007 16:29:33 GMT

Example image downloading

Show changes

Georg: /* Customizing */

Georg — Wed, 26 Dec 2007 15:57:49 GMT

Customizing

← Older revision		Revision as of 15:57, 26 December 2007
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	The idea was brought to me by an article in the German IT magazine c't (16/2007). The idea in short: If you plug in a device you usually want to perform a certain action. For a camera you want to copy the images from the camera to the hard disc, if it's a mp3 player you might to put new music on it...		The idea was brought to me by an article in the German IT magazine c't (16/2007). The idea in short: If you plug in a device you usually want to perform a certain action. For a camera you want to copy the images from the camera to the hard disc, if it's a mp3 player you might to put new music on it...

-	The mentioned article used udev and hal (hardware abstraction layer). Due to the different mechanism ~~used~~ on the arm9 ~~devices~~ it can not be transfered directly. So we ~~use~~ the idea ~~with~~ the hotplug.d concept.	+	The mentioned article used udev and hal (hardware abstraction layer). Due to the different mechanism implemented on the arm9 stock firmware it can not be transfered directly. So we adapt the idea using the hotplug.d concept.

-	All we have to do is to add a user script ~~into~~ e.g /etc/hotplug.d/usb/mydevice.hotplug and make it executable.	+	All we have to do is to add a user script e.g /etc/hotplug.d/usb/mydevice.hotplug and make it executable.

	This is explained in the following for a Canon powershot. We download the images, rotate them according to the exif flags and store them into a date dependent folder.		This is explained in the following for a Canon powershot. We download the images, rotate them according to the exif flags and store them into a date dependent folder.

Georg: How hotplug works on arm9 systems (linkstation/terastation pro/live) and a simple way to customize standard actions.

Georg — Wed, 26 Dec 2007 11:09:26 GMT

How hotplug works on arm9 systems (linkstation/terastation pro/live) and a simple way to customize standard actions.

New page

Hotplug on ARM9
This article explains (very short) how the hot plug system on the Linkstation Pro (also Live and Terasation Pro/Live - on the ARM9 series)works and shows a simple way to alter it in order to perform custom actions upon hot plugging.

=The hotplug system=
When plugging in a new usb device '''/sbin/hotplug''' is called. Before the call a number of environment variables are set (see http://linux-hotplug.sourceforge.net/?selected=hotplug). For this article the most important are:

'''$PRODUCT''' the product ID of the device
'''$ACTION''' "add"/"remove" depending on if the device is plugged or unplugged
'''$PATH''' /sbin:/bin:/usr/sbin:/usr/bin

Further a parameter $1 is passed to /sbin/hotplug, that depends on the device. Depending on this parameter scripts in /etc/hotplug.d/$1/*.hotplug are called. On the linkstation pro only one script for handling external usb disks exists '''/etc/hotplug.d/scsi_device/usb-buffalo.hotplug'''.

=Customizing=
The idea was brought to me by an article in the German IT magazine c't (16/2007). The idea in short: If you plug in a device you usually want to perform a certain action. For a camera you want to copy the images from the camera to the hard disc, if it's a mp3 player you might to put new music on it...

The mentioned article used udev and hal (hardware abstraction layer). Due to the different mechanism used on the arm9 devices it can not be transfered directly. So we use the idea with the hotplug.d concept.

All we have to do is to add a user script into e.g /etc/hotplug.d/usb/mydevice.hotplug and make it executable.

This is explained in the following for a Canon powershot. We download the images, rotate them according to the exif flags and store them into a date dependent folder.

=Example image downloading=
To come...