Jsujjava: Change to Category TCT-Hammer

2011-05-14T16:41:54Z

Change to Category TCT-Hammer

Jsujjava: Add Category Hammer

2011-05-13T13:12:41Z

Add Category Hammer

Prpplague at 15:33, 29 January 2008

2008-01-29T15:33:45Z

New page

== UserSpace Access ==

the carrier board push button can be accessed via the sysfs interface as well as a shell script functionality. the sysfs entry for the push button can be found in the directory mark /sys/devices/platform/gpio-keys.0 . the driver also looks for a shell script in /sbin called pb0.sh. this shell script can be used to start user land applications. here is the provided example shell script:

<pre>
#!/bin/sh

if [ $1 = "down" ] ; then
if [ -x /mnt/flash/scripts/pb0.down ] ; then
/mnt/flash/scripts/pb0.down
else
current=`cat /sys/class/leds/led1/brightness`
if [ "${current}" = 0 ] ; then
echo 1 > /sys/class/leds/led1/brightness
else
echo 0 > /sys/class/leds/led1/brightness
fi
fi
else
if [ -x /mnt/flash/scripts/pb0.up ] ; then
/mnt/flash/scripts/pb0.up
fi
fi#
</pre>

== Adding New PushButtons ==

the gpio buttons are defined in the linux-2.6.xx/arch/arm/mach-s3c2410/mach-tct_hammer.c file. each button requires that the gpio be defined, a name, and key scan code associated with it. in addition standard platform data and platform device have to be defined.

<pre>
static struct gpio_keys_button gpio_keys_buttons[] = {
[0] = {
.code = 0x26,
.gpio = S3C2410_GPG3,
.active_low = 0,
.desc = "PB0",
},
};

static struct gpio_keys_platform_data gpio_keys_data = {
.buttons = gpio_keys_buttons,
.nbuttons = ARRAY_SIZE(gpio_keys_buttons),
};

static struct platform_device tct_hammer_buttons = {
.name = "gpio-keys",
.id = 0,
.dev = {
.platform_data = &gpio_keys_data,
},
};
</pre>

== PushButton Hardware ==

[[Image:pb-example.jpg]]

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	[[Image:pb-example.jpg]]		[[Image:pb-example.jpg]]

−	[[Category:Hammer]]	+	[[Category:TCT-Hammer]]

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	== UserSpace Access ==		== UserSpace Access ==

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	[[Image:pb-example.jpg]]		[[Image:pb-example.jpg]]
		+
		+	[[Category:Hammer]]

Hammer Button Driver - Revision history

Jsujjava: Change to Category TCT-Hammer

Jsujjava: Add Category Hammer

Prpplague at 15:33, 29 January 2008