linux-kernel - Re: [RFC] i8042 - bypass AUX IRQ delivery test on laptops

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Date:	Tue, 18 Aug 2009 15:16:29 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Linux Input <linux-input@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] i8042 - bypass AUX IRQ delivery test on laptops

On Thu, 13 Aug 2009, Dmitry Torokhov wrote:

> It seems that many laptops do not fully implement AUX LOOP command
> in their keyboard controllers, causing issues with touchpad detection.
> Hovewer we know that almost every laptop/portable uses PS/2 pointing
> device and even if user disables it in favor of external mouse the
> system will not use IRQ 12 for anything else. Therefore we may bypass
> AUX IRQ delivery test when running on a laptop and assume that it is
> routed properly.
> 
> Just to be safe we require the box to have good PNP data in order to
> bypass the test.
> 
> Signed-off-by: Dmitry Torokhov <dtor@...l.ru>
> ---
> 
>  drivers/input/serio/i8042-x86ia64io.h |   34 +++++++++++++++++++++++++++++++++
>  drivers/input/serio/i8042.c           |    4 +++-
>  2 files changed, 37 insertions(+), 1 deletions(-)
> 
> 
> diff --git a/drivers/input/serio/i8042-x86ia64io.h b/drivers/input/serio/i8042-x86ia64io.h
> index ae04d8a..6747b9d 100644
> --- a/drivers/input/serio/i8042-x86ia64io.h
> +++ b/drivers/input/serio/i8042-x86ia64io.h
> @@ -449,6 +449,34 @@ static struct dmi_system_id __initdata i8042_dmi_nopnp_table[] = {
>  	},
>  	{ }
>  };
> +
> +static struct dmi_system_id __initdata i8042_dmi_laptop_table[] = {
> +	{
> +		.ident = "Portable",
> +		.matches = {
> +			DMI_MATCH(DMI_CHASSIS_TYPE, "8"), /* Portable */
> +		},
> +	},
> +	{
> +		.ident = "Laptop",
> +		.matches = {
> +			DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /* Laptop */
> +		},
> +	},
> +	{
> +		.ident = "Notebook",
> +		.matches = {
> +			DMI_MATCH(DMI_CHASSIS_TYPE, "10"), /* Notebook */
> +		},
> +	},
> +	{
> +		.ident = "Sub-Notebook",
> +		.matches = {
> +			DMI_MATCH(DMI_CHASSIS_TYPE, "14"), /* Sub-Notebook */
> +		},
> +	},
> +
> +};
>  #endif
>  
>  /*
> @@ -727,6 +755,12 @@ static int __init i8042_pnp_init(void)
>  	i8042_kbd_irq = i8042_pnp_kbd_irq;
>  	i8042_aux_irq = i8042_pnp_aux_irq;
>  
> +#ifdef CONFIG_X86
> +	i8042_bypass_aux_irq_test = !i8042_noaux &&
> +				    !pnp_data_busted &&
> +				    dmi_check_system(i8042_dmi_laptop_table);
> +#endif
> +
>  	return 0;
>  }
>  
> diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
> index 9f5c050..b53a015 100644
> --- a/drivers/input/serio/i8042.c
> +++ b/drivers/input/serio/i8042.c
> @@ -83,6 +83,8 @@ module_param_named(debug, i8042_debug, bool, 0600);
>  MODULE_PARM_DESC(debug, "Turn i8042 debugging mode on and off");
>  #endif
>  
> +static bool i8042_bypass_aux_irq_test;
> +
>  #include "i8042.h"
>  
>  static DEFINE_SPINLOCK(i8042_lock);
> @@ -641,7 +643,7 @@ static int __devinit i8042_check_aux(void)
>   * used it for a PCI card or somethig else.
>   */
>  
> -	if (i8042_noloop || aux_loop_broken) {
> +	if (i8042_noloop || i8042_bypass_aux_irq_test || aux_loop_broken) {

I guess some entries could then be nuked from i8042_dmi_noloop_table[]?

-- 
Jiri Kosina
SUSE Labs

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