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| author | Andreas Kemnade <andreas@kemnade.info> | 2013-11-01 16:29:06 +0100 |
|---|---|---|
| committer | H. Nikolaus Schaller <hns@goldelico.com> | 2013-11-03 15:34:09 +0100 |
| commit | 8c52a7cf8e066d7ce202e38863c225a7d4d0bfeb (patch) | |
| tree | 548e9743c79c096a9867d054b8a547067b09cbee /GTA04 | |
| parent | d4b3d5c8e6a0cf80192bce9a19cb5573fb08d235 (diff) | |
| download | kernel_goldelico_gta04-8c52a7cf8e066d7ce202e38863c225a7d4d0bfeb.zip kernel_goldelico_gta04-8c52a7cf8e066d7ce202e38863c225a7d4d0bfeb.tar.gz kernel_goldelico_gta04-8c52a7cf8e066d7ce202e38863c225a7d4d0bfeb.tar.bz2 | |
usb: various hacks related to otg
- start switch to b_host role via sysfs
- control vbus output power
- can be used to start charging when a charger with ID
grounded is first connected to the device and then to the
wall outlet
- enable/disable pulldown resistors via sysfs,
can be used to emulate a connection to a usb host,
useful for switching to b_host when using y-cables
- script for entering b_host mode
Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Diffstat (limited to 'GTA04')
| -rw-r--r-- | GTA04/README | 5 | ||||
| -rwxr-xr-x | GTA04/scripts/b_host.sh | 35 |
2 files changed, 40 insertions, 0 deletions
diff --git a/GTA04/README b/GTA04/README index dad8c0a..fcb638d 100644 --- a/GTA04/README +++ b/GTA04/README @@ -28,3 +28,8 @@ simple tasks + vibra.py shows how to program the vibrator as a rumble effect. + + b_host.sh helps to switch to b_host otg state (GTA04 is external + powered but plays the role of an usb host, the id pin is + not grounded in that situation). First apply power or switch on + software-controlled charging, run that script, then also connect + the usb data lines diff --git a/GTA04/scripts/b_host.sh b/GTA04/scripts/b_host.sh new file mode 100755 index 0000000..16e04c1 --- /dev/null +++ b/GTA04/scripts/b_host.sh @@ -0,0 +1,35 @@ +#!/bin/sh +# if not in software-controlled charging mode, Vbus (and only that) +# has to be applied before running the script +#MUSB_MODE=/sys/bus/platform/devices/musb-hdrc/mode +#MUSB_MODE=/sys/bus/platform/devices/musb-hdrc.0/mode +MUSB_MODE=/sys/bus/platform/devices/musb-hdrc.1.auto/mode + +MUSB_M=`cat $MUSB_MODE` +echo "$MUSB_M" +if [ "$MUSB_M" != b_idle ] ; then + echo Invalid mode at start + exit +fi +# trigger a transition from b_idle to b_peripheral by simulating +# a connection to a host (enable pull-down resistors) +echo on > /sys/bus/platform/devices/twl4030_usb/fake_host +sleep 0.2 +cat $MUSB_MODE +# trigger a transition from b_peripheral to b_hnp_enable +echo host >$MUSB_MODE +cat $MUSB_MODE +sleep 0.2 +# simulate a disconnection from host +echo off > /sys/bus/platform/devices/twl4030_usb/fake_host +sleep 0.2 +cat $MUSB_MODE +# be a host by ourselfs (if we wouldn't mess with this bit, +# it would be already set here) +echo on > /sys/bus/platform/devices/twl4030_usb/fake_host +MUSB_M=`cat $MUSB_MODE` +echo "$MUSB_M" + +if [ "$MUSB_M" = b_wait_acon ] ; then + echo "Prepared for being usb host, time to attach your device" +fi |