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SubjectRe: Fwd: Patch for initial CapsLock
On Tue, Jan 07, 2003 at 05:07:46PM -0500, Pete Zaitcev wrote:
> > > Do you want me to do the same for 2.5? It should be a little
> > > simpler there, and no new exports.
> >
> > Yes, please.
>
> Done, works for me.
>
> I toyed with the idea to trigger keyboard tasklet instead of
> locking it out and calling methods, but I did not see how
> to force updates for unchanged ledstate. Changing ledstate to 0xff
> just looked so very wrong...

Thanks, this looks very good.

>
> -- Pete
>
> --- linux-2.5.54/drivers/char/keyboard.c 2002-12-15 18:07:54.000000000 -0800
> +++ linux-2.5.54-p3/drivers/char/keyboard.c 2003-01-07 13:55:25.000000000 -0800
> @@ -894,9 +894,9 @@
> * Aside from timing (which isn't really that important for
> * keyboard interrupts as they happen often), using the software
> * interrupt routines for this thing allows us to easily mask
> - * this when we don't want any of the above to happen. Not yet
> - * used, but this allows for easy and efficient race-condition
> - * prevention later on.
> + * this when we don't want any of the above to happen.
> + * This allows for easy and efficient race-condition prevention
> + * for kbd_refresh_leds => input_event(dev, EV_LED, ...) => ...
> */
>
> static void kbd_bh(unsigned long dummy)
> @@ -918,6 +918,22 @@
>
> DECLARE_TASKLET_DISABLED(keyboard_tasklet, kbd_bh, 0);
>
> +/*
> + * This allows a newly plugged keyboard to pick the LED state.
> + */
> +void kbd_refresh_leds(struct input_handle *handle)
> +{
> + unsigned char leds = ledstate;
> +
> + tasklet_disable(&keyboard_tasklet);
> + if (leds != 0xff) {
> + input_event(handle->dev, EV_LED, LED_SCROLLL, !!(leds & 0x01));
> + input_event(handle->dev, EV_LED, LED_NUML, !!(leds & 0x02));
> + input_event(handle->dev, EV_LED, LED_CAPSL, !!(leds & 0x04));
> + }
> + tasklet_enable(&keyboard_tasklet);
> +}
> +
> #if defined(CONFIG_X86) || defined(CONFIG_IA64) || defined(CONFIG_ALPHA) || defined(CONFIG_MIPS) || defined(CONFIG_PPC) || defined(CONFIG_SPARC32) || defined(CONFIG_SPARC64)
>
> static unsigned short x86_keycodes[256] =
> @@ -1159,6 +1175,7 @@
> handle->name = kbd_name;
>
> input_open_device(handle);
> + kbd_refresh_leds(handle);
>
> return handle;
> }

--
Vojtech Pavlik
SuSE Labs
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