Editing N900 Hardware USB Host

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This page is for those working on the implementation of friendly USB host mode.

See also [https://garage.maemo.org/projects/h-e-n/ the garage project].

==Status==
USB Host mode has reached beta status, and is working reliably with manual speed switching.

Proper host mode would only require the normal cable, and a commonly available adapter. ([http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=250641334947 USB A-A adaptor])

A pre-alpha of hostmode was released on the 23rd of September, here: http://talk.maemo.org/showthread.php?p=824298

This release is unreliable, and an implementation of proper host mode is likely to be much more stable.

A beta release, based on Paul's completely rewritten patches (see h-e-n's garage repository) was released on the 7th of November, and is the closest release yet to proper hostmode, http://talk.maemo.org/showthread.php?t=65232

There are several parts to getting USB host mode working for normal users.

Some of these are quite easy, many are not.

* Kernel modifications to make USB host work properly [done, thanks to Paul]

* USB modules for supporting hardware.  This is fairly simple for most hardware - some hardware modules will not compile cleanly on ARM, and binary drivers that allow you to use windows drivers with some stuff will never work.

For most drivers, if a particular driver does not work, it's generally a bug in the driver that should be fixed by that drivers maintainer.

* Understanding and reverse engineering [[N900_Software_BME|BMEs (Battery managment Entity)]] interaction with the hardware.

This is in progress. All of the hardware required to make a BME clone is understood.

* Usermode software. 
** The current software will not do the right thing if the user plugs in almost all devices - even if hostmode worked. To make a mouse work, you might want to enable a pointer for example.

==Ideas for hostmode user-software==
When an external power supply is found, the following should be done in sequence.

"Paul has found out that it is impossible (at least at the time of writing) to detect speed changes while VBUS is running, so for now, you have to select speeds manually.
Use common sense in doing so, '''high speed''' is for devices that require a lot of writing and are fairly new (flash drives/HDDs/CD-drives, new hubs).
'''Full speed''' devices are devices that do not require a lot of USB activity, such as BT/2.4GHz mouse transceivers.
'''Low speed''' devices are normal mice and keyboards."

"A help window is available and will guide you through the steps needed.
The mount button is currently hardcoded to mount /dev/sda1, default for most USB flash drives and HDDs.
For NTFS support, do modprobe ntfs as root
For ISO (CDs/DVDs - most of them), do modprobe isofs (also as root).
CDs will have the dev node /dev/sr0, so you'll need to do mount /dev/sr0 /mnt etc...
Disabling tracker by adding /media/flash to tracker-cfg's non watch configuration is recomended, use tracker-cfg UI."

==Installation==
Install hostmode-gui from -devel, your kernel will be replaced.

apt-get install hostmode-gui

== Warning: ==
Uninstalling "h-e-n" might brick your device. However, it's easy to restore it to a working state by re-flashing the kernel.

'''Steps:'''
*download http://tablets-dev.nokia.com/nokia_N900.php?f=RX-51_2009SE_20.2010.36-2_PR_COMBINED_MR0_ARM.bin
*download flasher for your system from http://tablets-dev.nokia.com/maemo-dev-env-downloads.php and install it
*Turn off your device
*Plug-in usb cable into n900
*open console and run flasher-3.5 -F RX-51_2009SE_20.2010.36-2_PR_COMBINED_MR0_ARM.bin --flash-only=kernel -f -R 
The .bin file has to be in the "current" directory. 
* Initiate flashing by pressing enter
* Turn on your device, slide-down keyboard and press "U"
* Wait until flashing is finished
* You should get a working phone with all of your programs and settings.

== Devices ==
You can plug-in almost anything into a usb port of the n900. However, many devices require a special driver in order to work. The custom kernel already provides basic drivers for devices such as:

* USB Storage(cd-roms, flash drives, hdd, etc)
* USB HID(Keyboards, mice, joysticks, touchpads, etc)

== Demos ==
* http://www.youtube.com/watch?v=zDzUG-bno6Q by MohammadAG (usb CD-ROM)
* http://www.youtube.com/watch?v=1Qfx_jaQ9jo&NR=1 by divan0  (usb HDD via usbhub)
* http://www.youtube.com/watch?v=9byE_qTl15M by divan0 (usb keyboard)

==Hostmode development team:==

'''Project Admins:'''
*Joerg Reisenweber
*Paul Fertser

'''Developers:'''
*Chitrang Srivastava
*Dave na
*Hagen Meyer
*Ian Stirling
*Jacek Milewicz
*Klaus Kurzmann
*Mohammad Abu-Garbeyyeh
*Mugur Enache
*Sarah Newman
*Sonny Jim
*Tom Tanner

Most information is taken from [http://talk.maemo.org/showthread.php?t=65232 this thread] created by MohammadAG

[[category:N900_Hardware]]

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Editing N900 Hardware USB Host

@@ Line 6: / Line 6: @@
 USB Host mode has reached beta status, and is working reliably with manual speed switching.
-Proper host mode would only require the normal cable, and a commonly available adapter. ([http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=250641334947 USB A-A adaptor]) Or maybe you like to get a fitting all-in-one small adapter, or make one fit ([http://talk.maemo.org/showthread.php?p=873725#post873725 N8 OTG adapter rework]). Huge rigid adapters are STRONGLY DEPRECATED, regarding the notorious problems with USB receptacle coming off the PCB.
+Proper host mode would only require the normal cable, and a commonly available adapter. ([http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=250641334947 USB A-A adaptor])
 A pre-alpha of hostmode was released on the 23rd of September, here: http://talk.maemo.org/showthread.php?p=824298
@@ Line 34: / Line 34: @@
 When an external power supply is found, the following should be done in sequence.
-*If the supply is a charger (D+,D- short, detected by the 1707a), fast charge.
+"Paul has found out that it is impossible (at least at the time of writing) to detect speed changes while VBUS is running, so for now, you have to select speeds manually.
-*Attempt to enumerate as a device, if this succeeds (including handling of suspended busses), then enumerate and charge as a device, respecting the enumerated current.
+Use common sense in doing so, '''high speed''' is for devices that require a lot of writing and are fairly new (flash drives/HDDs/CD-drives, new hubs).
-*If both enumeration as a device and charger detection have failed, we may be plugged into a hub or device with reverse power. Attempt to enumerate connected devices (=hostmode. Will not work due to [probably hardware] limitations in hostmode, which block speed selection after VBUS got applied). Charge at user-defined maximum current. For example - may be a 500mA power supply also supplying the hub and a keyboard = 2 unit loads - max draw = 300mA. Anyway see http://talk.maemo.org/showthread.php?p=921203#post921203 for actually powering N900 from external supply during hostmode. Implementation of this feature to h-e-n GUI still pending.
+'''Full speed''' devices are devices that do not require a lot of USB activity, such as BT/2.4GHz mouse transceivers.
+'''Low speed''' devices are normal mice and keyboards."
+"A help window is available and will guide you through the steps needed.
+The mount button is currently hardcoded to mount /dev/sda1, default for most USB flash drives and HDDs.
+For NTFS support, do modprobe ntfs as root
+For ISO (CDs/DVDs - most of them), do modprobe isofs (also as root).
+CDs will have the dev node /dev/sr0, so you'll need to do mount /dev/sr0 /mnt etc...
+Disabling tracker by adding /media/flash to tracker-cfg's non watch configuration is recomended, use tracker-cfg UI."
 ==Installation==
-Install hostmode-gui from -devel, kernel-power will be installed if no other compatible kernel is present.
+Install hostmode-gui from -devel, your kernel will be replaced.
-'''apt-get install hostmode-gui'''
-[Update]
-"The most recent h-e-n pkg itself should come '''without any kernel''' now (just the GUI), however, it does depend on kernel-feature-usbhost, so any kernel providing that works, if no kernel is installed, kernel-power will be installed, and - as mentioned in a previous post - h-e-n doesn't plan to ship any dedicated hostmode kernels anymore.
+apt-get install hostmode-gui
-The GUI will check if a compatible API is present (as per /proc/driver/musb_hdrc), and will notify to user if problems are detected (with hostmode support in whatever is the currently installed kernel).
-Of course a mere update of h-e-n pkg won't magically switch from h-e-n hostmode kernel to power kernel. You have to care for that yourself."
-==Usage==
+== Warning: ==
+Uninstalling "h-e-n" might brick your device. However, it's easy to restore it to a working state by re-flashing the kernel.
-A help window is available and will guide you through the steps needed.
+'''Steps:'''
-The mount button currently executes a script that reads /proc/partitions and mounts all devices there on /media/<partition_number>.
+*download http://tablets-dev.nokia.com/nokia_N900.php?f=RX-51_2009SE_20.2010.36-2_PR_COMBINED_MR0_ARM.bin
-The script will also modprobe ntfs and isofs (if /dev/sr0 is present), it will also create a temporary symlink (/dev/dvd) so mplayer works without any modifications (a package with DVD support compiled is needed)
+*download flasher for your system from http://tablets-dev.nokia.com/maemo-dev-env-downloads.php and install it
-Disabling tracker by adding /media/<partition_name> to tracker-cfg's non watch configuration is HIGHLY recommended, use tracker-cfg UI.
+*Turn off your device
+*Plug-in usb cable into n900
+*open console and run flasher-3.5 -F RX-51_2009SE_20.2010.36-2_PR_COMBINED_MR0_ARM.bin --flash-only=kernel -f -R
+The .bin file has to be in the "current" directory.
+* Initiate flashing by pressing enter
+* Turn on your device, slide-down keyboard and press "U"
+* Wait until flashing is finished
+* You should get a working phone with all of your programs and settings.
 == Devices ==
@@ Line 65: / Line 75: @@
 == Demos ==
 * http://www.youtube.com/watch?v=zDzUG-bno6Q by MohammadAG (usb CD-ROM)
-* http://www.youtube.com/watch?v=6ED92orZLMM by divan0 (usb flash drive)
+* http://www.youtube.com/watch?v=1Qfx_jaQ9jo&NR=1 by divan0  (usb HDD via usbhub)
-* http://www.youtube.com/watch?v=1Qfx_jaQ9jo by divan0  (usb HDD via usbhub)
-* http://www.youtube.com/watch?v=ua5xpTZJpwo by divan0 (usb mouse)
 * http://www.youtube.com/watch?v=9byE_qTl15M by divan0 (usb keyboard)
-* http://www.youtube.com/watch?v=0YPk4Y0ZPQY by divan0 (usb card reader)
-* http://www.youtube.com/watch?v=3IyeSNGCWTA by divan0 (usb Ethernet adapter)
-* http://www.youtube.com/watch?v=AUjbFi3-GpA by davidxfoo (USB I2C Sonar SRF08)
 ==Hostmode development team:==