Re: [systemd-devel] GPIO Reset Button
Op 10 nov. 2012, om 01:17 heeft Lennart Poettering het
volgende geschreven:
> On Fri, 02.11.12 09:56, Pawel Pastuszak (pawelpastus...@gmail.com) wrote:
>
>> Hi all,
>>
>> I was wondering if there is an way to attach an GPIO line to reboot the
>> system. I am currently working on an Embedded device that has an GPIO line
>> which needs to act as an reboot button this GPIO comes up as an
>> /sys/class/gpio/gpio103/ which i want to have it trigger when it switches
>> state to low and do an system soft reboot. Does systemd allow any
>> functionally like this?
>
> No. We only look for input devices marked with the "power-switch"
> tag.
>
> The kernel can create input devices for GPIO lines
> (CONFIG_KEYBOARD_GPIO), IIRC? Maybe that's useful to achieve this?
It should be a matter of:
static struct gpio_keys_button my_awesome_gpio_keys[] = {
{
.code = KEY_POWER,
.gpio = GPIO_TO_PIN(1, 16),
.active_low = true,
.desc = "left",
.type = EV_KEY,
.wakeup = 1,
},
};
static struct gpio_keys_platform_data my_awesome_gpio_key_info = {
.buttons= my_awesome_gpio_keys,
.nbuttons = ARRAY_SIZE(my_awesome_gpio_keys),
};
static struct platform_device my_awesome_keys = {
.name = "gpio-keys",
.id = -1,
.dev= {
.platform_data = &my_awesome_gpio_key_info,
},
};
Or with devicetree:
gpio_keys {
compatible = "gpio-keys";
pinctrl-names = "default";
pinctrl-0 = <&bone_lcd3_cape_keys_00A0_pins>; // add a
pinctrl section about if needed, otherwise delete these 2 lines
#address-cells = <1>;
#size-cells = <0>;
button@1 {
debounce_interval = <50>;
linux,code = <105>; // replace with proper
KEY_POWER code
label = "left";
gpios = <&gpio2 16 0x0>;
gpio-key,wakeup;
autorepeat;
};
};
That will give you a native evdev device that emits KEY_POWER when you toggle
the GPIO.
regards,
Koen
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Re: [systemd-devel] GPIO Reset Button
On Fri, 02.11.12 09:56, Pawel Pastuszak (pawelpastus...@gmail.com) wrote: > Hi all, > > I was wondering if there is an way to attach an GPIO line to reboot the > system. I am currently working on an Embedded device that has an GPIO line > which needs to act as an reboot button this GPIO comes up as an > /sys/class/gpio/gpio103/ which i want to have it trigger when it switches > state to low and do an system soft reboot. Does systemd allow any > functionally like this? No. We only look for input devices marked with the "power-switch" tag. The kernel can create input devices for GPIO lines (CONFIG_KEYBOARD_GPIO), IIRC? Maybe that's useful to achieve this? If CONFIG_KEYBOARD_GPIO is not useful for this, I'd be willing to merge a patch for logind that makes it watch gpio lines marked with a specific udev tag the same way it already watches input devices. The code for that should be quite simple and minimal given that we already have the input-based code in place. That way adding device-specific udev rules adding the tag to your gpio device is all that is necessary to make logind pick it up. This should be useful frequently enough to make a logind core feature that we can support upstream. Lennart -- Lennart Poettering - Red Hat, Inc. ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] GPIO Reset Button
On Friday 02 November 2012 09:56:53 Pawel Pastuszak wrote: > Hi all, > > I was wondering if there is an way to attach an GPIO line to reboot the > system. I am currently working on an Embedded device that has an GPIO line > which needs to act as an reboot button this GPIO comes up as an > /sys/class/gpio/gpio103/ which i want to have it trigger when it switches > state to low and do an system soft reboot. Does systemd allow any > functionally like this? why not write a evdev driver that report that button as poweroff button ? > > Thanks, > Pawel -- ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
[systemd-devel] GPIO Reset Button
Hi all, I was wondering if there is an way to attach an GPIO line to reboot the system. I am currently working on an Embedded device that has an GPIO line which needs to act as an reboot button this GPIO comes up as an /sys/class/gpio/gpio103/ which i want to have it trigger when it switches state to low and do an system soft reboot. Does systemd allow any functionally like this? Thanks, Pawel ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
