linux-kernel - Re: [PATCH] lis3: Add axes module parameter for custom axis-mapping

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Date:	Tue, 07 Sep 2010 08:45:35 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Eric Piel <eric.piel@...mplin-utc.net>,
	Jean Delvare <khali@...ux-fr.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lis3: Add axes module parameter for custom axis-mapping

At Mon, 23 Aug 2010 14:23:25 +0200,
Takashi Iwai wrote:
> 
> The axis-mapping of lis3dev device on many (rather most) HP machines
> doesn't follow the standard.  When each new model appears, users need
> to adjust again.  Testing this requires the rebuild of kernel, thus
> it's not trivial for end-users.
> 
> This patch adds a module parameter "axes" to allow a custom
> axis-mapping without patching and recompiling the kernel driver.
> User can pass the parameter such as axes=3,2,1.  Also it can be
> changed via sysfs.
> 
> Signed-off-by: Takashi Iwai <tiwai@...e.de>

Can anyone review / take this?
Jean, should it be through hwmon tree? 


thanks,

Takashi

> ---
>  drivers/hwmon/hp_accel.c  |    5 ++++-
>  drivers/hwmon/lis3lv02d.c |   45 +++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 49 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/hwmon/hp_accel.c b/drivers/hwmon/hp_accel.c
> index 7580f55..3462a5d 100644
> --- a/drivers/hwmon/hp_accel.c
> +++ b/drivers/hwmon/hp_accel.c
> @@ -297,7 +297,10 @@ static int lis3lv02d_add(struct acpi_device *device)
>  	lis3lv02d_enum_resources(device);
>  
>  	/* If possible use a "standard" axes order */
> -	if (dmi_check_system(lis3lv02d_dmi_ids) == 0) {
> +	if (lis3_dev.ac.x && lis3_dev.ac.y && lis3_dev.ac.z) {
> +		printk(KERN_INFO DRIVER_NAME ": Using custom axes %d,%d,%d\n",
> +		       lis3_dev.ac.x, lis3_dev.ac.y, lis3_dev.ac.z);
> +	} else if (dmi_check_system(lis3lv02d_dmi_ids) == 0) {
>  		printk(KERN_INFO DRIVER_NAME ": laptop model unknown, "
>  				 "using default axes configuration\n");
>  		lis3_dev.ac = lis3lv02d_axis_normal;
> diff --git a/drivers/hwmon/lis3lv02d.c b/drivers/hwmon/lis3lv02d.c
> index 6138f03..4b179d5 100644
> --- a/drivers/hwmon/lis3lv02d.c
> +++ b/drivers/hwmon/lis3lv02d.c
> @@ -75,6 +75,51 @@ struct lis3lv02d lis3_dev = {
>  
>  EXPORT_SYMBOL_GPL(lis3_dev);
>  
> +static int axis_array[3];
> +static void copy_to_axis_array(void)
> +{
> +	axis_array[0] = lis3_dev.ac.x;
> +	axis_array[1] = lis3_dev.ac.y;
> +	axis_array[2] = lis3_dev.ac.z;
> +}
> +
> +static void copy_from_axis_array(void)
> +{
> +	lis3_dev.ac.x = axis_array[0];
> +	lis3_dev.ac.y = axis_array[1];
> +	lis3_dev.ac.z = axis_array[2];
> +}
> +
> +static int param_set_axis(const char *val, const struct kernel_param *kp)
> +{
> +	int ret;
> +	copy_to_axis_array();
> +	ret = param_set_int(val, kp);
> +	if (!ret) {
> +		int val = *(int *)kp->arg;
> +		if (val < 0)
> +			val = -val;
> +		if (!val || val > 3)
> +			return -EINVAL;
> +		copy_from_axis_array();
> +	}
> +	return ret;
> +}
> +
> +static int param_get_axis(char *buffer, const struct kernel_param *kp)
> +{
> +	copy_to_axis_array();
> +	return param_get_int(buffer, kp);
> +}
> +
> +static struct kernel_param_ops param_ops_axis = {
> +	.set = param_set_axis,
> +	.get = param_get_axis,
> +};
> +
> +module_param_array_named(axes, axis_array, axis, NULL, 0644);
> +MODULE_PARM_DESC(axes, "Axis-mapping for x,y,z directions");
> +
>  static s16 lis3lv02d_read_8(struct lis3lv02d *lis3, int reg)
>  {
>  	s8 lo;
> -- 
> 1.7.2.1
> 
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