Controlling green LED.

[mgillespie]

Is there a way to control the green LED on the sheeva?  (I have he blue one working very well as my "unread mail" indicator), and would like to utilise the green one too.

Is it even possible?  (is it hardwired?), or does it require kernel hacks?

[noman]

It's possible, but not that easy.

This is for the Rev 1.3
First you have to desolder R242 and put it on the place of R70.
You also have to patch the Kernel, but that's very easy, i have done it already.

[birdman]

Is there any reason why the sysfs control for the blue LED is called plug:green:health? 

[mgillespie]

It's possible, but not that easy.

This is for the Rev 1.3
First you have to desolder R242 and put it on the place of R70.
You also have to patch the Kernel, but that's very easy, i have done it already.

Do you have details of the kernel patch involved?  I need to weigh up the cost of not being able to use standard kernels anymore.... and all the hurt that cross compiling brings...

[paulo_raca]

That`s pretty simple, actually.
Check arch/arm/mach-kirkwood/sheevaplug-setup.c
I think all you have to do is adding a new entry to sheevaplug_led_pins[].
You'll also need to know the right GPIO pin.

(That`s also the place to change the name of plug:green:health to anything you want)

[noman]

Do you have details of the kernel patch involved?  I need to weigh up the cost of not being able to use standard kernels anymore.... and all the hurt that cross compiling brings...

Ack, you have to add the new "LED" to the struct gpio_led sheevaplug_led_pins[] and add the GPIO to the sheevaplug_mpp_config

Code:

static struct gpio_led sheevaplug_led_pins[] = {
{
.name = "plug:blue9:health",
.default_trigger = "default-on",
.gpio = 49,
.active_low = 1,
},
{
.name = "plug:green8:health",
.default_trigger = "default-on",
.gpio = 48,
.active_low = 1,
},
{
.name = "plug:green6:health",
.default_trigger = "default-on",
.gpio = 46,
.active_low = 1,
},
{
.name = "plug:green5:health",
.default_trigger = "default-on",
.gpio = 45,
.active_low = 1,
},
};

Code:

static unsigned int sheevaplug_mpp_config[] __initdata = {
MPP29_GPIO, /* USB Power Enable */
MPP49_GPIO, /* LED */
MPP48_GPIO,
MPP46_GPIO,
MPP45_GPIO,
0
};

[snake]

That`s pretty simple, actually.
Check arch/arm/mach-kirkwood/sheevaplug-setup.c
I think all you have to do is adding a new entry to sheevaplug_led_pins[].
You'll also need to know the right GPIO pin.

(That`s also the place to change the name of plug:green:health to anything you want)

Thanks for this information...  It helped me to control the individual colors in the tricolor LED mounted on my plugcomputer...

[tbm]

Is there any reason why the sysfs control for the blue LED is called plug:green:health? 

It is green on older versions of the SheevaPlug (such as mine).

[birdman]

It is green on older versions of the SheevaPlug (such as mine).

So what colour is the other one - the one that isn't green for you (but is green  for me!)?  Do you have 2 LEDs on the top edge?

[restamp]

My LEDs are Green (top; nearest the electrical connector) and Blue (bottom; nearest the ethernet and USB ports).  I think early Plugs had Green and Red.  Any other combinations out there?