linux-kernel - Re: [PATCH 4/4] msi-laptop: Add i8042 filter to sync sw state with BIOS when function key pressed

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Date:	Wed, 12 May 2010 10:33:59 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Greg Kroah-Hartman <gregkh@...e.de>
Cc:	mjg@...hat.com, mzxreary@...inter.de, rpurdie@...ux.intel.com,
	jlee@...ell.com, linux-kernel@...r.kernel.org,
	platform-driver-x86@...r.kernel.org, greg@...ah.com
Subject: Re: [PATCH 4/4] msi-laptop: Add i8042 filter to sync sw state with
 BIOS when function key pressed

On Wed, May 12, 2010 at 09:58:10AM -0700, Greg Kroah-Hartman wrote:
> From: Lee, Chun-Yi <jlee@...ell.com>
> 
> There have some MSI netbook change devices state by EC when user press
> wlan/bluetooth/wwan function keys. So, add a i8042 filter to sync sw
> state with BIOS when function keys pressed.
> 
> Signed-off-by: Lee, Chun-Yi <jlee@...ell.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
> ---
>  drivers/platform/x86/msi-laptop.c |   59 ++++++++++++++++++++++++++++++++++++-
>  1 files changed, 58 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/platform/x86/msi-laptop.c b/drivers/platform/x86/msi-laptop.c
> index 34bec2e..3c6e160 100644
> --- a/drivers/platform/x86/msi-laptop.c
> +++ b/drivers/platform/x86/msi-laptop.c
> @@ -59,6 +59,7 @@
>  #include <linux/backlight.h>
>  #include <linux/platform_device.h>
>  #include <linux/rfkill.h>
> +#include <linux/i8042.h>
>  
>  #define MSI_DRIVER_VERSION "0.5"
>  
> @@ -581,6 +582,46 @@ static void rfkill_cleanup(void)
>  	}
>  }
>  
> +static void msi_update_rfkill(struct work_struct *ignored)
> +{
> +	get_wireless_state_ec_standard();
> +
> +	if (rfk_wlan)
> +		rfkill_set_sw_state(rfk_wlan, !wlan_s);
> +	if (rfk_bluetooth)
> +		rfkill_set_sw_state(rfk_bluetooth, !bluetooth_s);
> +	if (rfk_threeg)
> +		rfkill_set_sw_state(rfk_threeg, !threeg_s);
> +}
> +static DECLARE_DELAYED_WORK(msi_rfkill_work, msi_update_rfkill);
> +
> +bool msi_laptop_i8042_filter(unsigned char data, unsigned char str,
> +				struct serio *port)

Make it static bool...

> +{
> +	static bool extended;
> +
> +	if (str & 0x20)
> +		return false;
> +
> +	/* 0x54 wwan, 0x62 bluetooth, 0x76 wlan*/
> +	if (unlikely(data == 0xe0)) {
> +		extended = true;
> +		return false;
> +	} else if (unlikely(extended)) {
> +		switch (data) {
> +		case 0x54:
> +		case 0x62:
> +		case 0x76:
> +			schedule_delayed_work(&msi_rfkill_work,
> +				round_jiffies_relative(0.5 * HZ));
> +			break;
> +		}
> +		extended = false;
> +	}
> +
> +	return false;
> +}
> +
>  static void msi_init_rfkill(struct work_struct *ignored)
>  {
>  	if (rfk_wlan) {
> @@ -706,9 +747,24 @@ static int load_scm_model_init(struct platform_device *sdev)
>  	/* initial rfkill */
>  	result = rfkill_init(sdev);
>  	if (result < 0)
> -		return result;
> +		goto fail_rfkill;
> +
> +	result = i8042_install_filter(msi_laptop_i8042_filter);
> +	if (result) {
> +		printk(KERN_WARNING

Since we fail driver load this should be error, not warning message.

> +			"msi-laptop: Unable to install key filter\n");
> +		goto fail_filter;
> +	}
>  
>  	return 0;
> +
> +fail_filter:
> +	rfkill_cleanup();
> +
> +fail_rfkill:
> +
> +	return result;
> +
>  }
>  
>  static int __init msi_init(void)
> @@ -819,6 +875,7 @@ static void __exit msi_cleanup(void)
>  	platform_driver_unregister(&msipf_driver);
>  	backlight_device_unregister(msibl_device);
>  
> +	i8042_remove_filter(msi_laptop_i8042_filter);
>  	rfkill_cleanup();
>  
>  	/* Enable automatic brightness control again */

-- 
Dmitry
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