linux-kernel - Re: [PATCH v2] platform/x86: classmate-laptop: use sysfs

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Message-ID: <8aad63f7-9d38-034f-3857-02aabffa4738@linux.intel.com>
Date: Wed, 23 Oct 2024 15:39:59 +0300 (EEST)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: chen zhang <chenzhang@...inos.cn>
cc: Hans de Goede <hdegoede@...hat.com>, cascardo@...oscopio.com, 
    platform-driver-x86@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>, 
    chenzhang_0901@....com
Subject: Re: [PATCH v2] platform/x86: classmate-laptop: use sysfs_emit()
 instead of sprintf()

On Wed, 23 Oct 2024, chen zhang wrote:

> Follow the advice in Documentation/filesystems/sysfs.rst:
> show() should only use sysfs_emit() or sysfs_emit_at() when formatting
> the value to be returned to user space.
> 
> Signed-off-by: chen zhang <chenzhang@...inos.cn>
> ---
> v2: add #include <linux/sysfs.h>
> ---
>  drivers/platform/x86/classmate-laptop.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/platform/x86/classmate-laptop.c b/drivers/platform/x86/classmate-laptop.c
> index cb6fce655e35..6b1b8e444e24 100644
> --- a/drivers/platform/x86/classmate-laptop.c
> +++ b/drivers/platform/x86/classmate-laptop.c
> @@ -12,6 +12,7 @@
>  #include <linux/backlight.h>
>  #include <linux/input.h>
>  #include <linux/rfkill.h>
> +#include <linux/sysfs.h>
>  
>  struct cmpc_accel {
>  	int sensitivity;
> @@ -208,7 +209,7 @@ static ssize_t cmpc_accel_sensitivity_show_v4(struct device *dev,
>  	inputdev = dev_get_drvdata(&acpi->dev);
>  	accel = dev_get_drvdata(&inputdev->dev);
>  
> -	return sprintf(buf, "%d\n", accel->sensitivity);
> +	return sysfs_emit(buf, "%d\n", accel->sensitivity);
>  }
>  
>  static ssize_t cmpc_accel_sensitivity_store_v4(struct device *dev,
> @@ -257,7 +258,7 @@ static ssize_t cmpc_accel_g_select_show_v4(struct device *dev,
>  	inputdev = dev_get_drvdata(&acpi->dev);
>  	accel = dev_get_drvdata(&inputdev->dev);
>  
> -	return sprintf(buf, "%d\n", accel->g_select);
> +	return sysfs_emit(buf, "%d\n", accel->g_select);
>  }
>  
>  static ssize_t cmpc_accel_g_select_store_v4(struct device *dev,
> @@ -550,7 +551,7 @@ static ssize_t cmpc_accel_sensitivity_show(struct device *dev,
>  	inputdev = dev_get_drvdata(&acpi->dev);
>  	accel = dev_get_drvdata(&inputdev->dev);
>  
> -	return sprintf(buf, "%d\n", accel->sensitivity);
> +	return sysfs_emit(buf, "%d\n", accel->sensitivity);
>  }
>  
>  static ssize_t cmpc_accel_sensitivity_store(struct device *dev,
> 

Hi,

Thank you for your patch, however, a similar patch (from somebody else) 
has been already applied so I dropped this one.

-- 
 i.