linux-kernel - Re: [PATCH] backlight: da9052: Fix module autoload

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Date:   Wed, 4 Jan 2017 11:40:51 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Javier Martinez Canillas <javier@....samsung.com>
Cc:     linux-kernel@...r.kernel.org, linux-fbdev@...r.kernel.org,
        Jingoo Han <jingoohan1@...il.com>,
        Support Opensource <support.opensource@...semi.com>
Subject: Re: [PATCH] backlight: da9052: Fix module autoload

On Mon, 02 Jan 2017, Javier Martinez Canillas wrote:

> The driver has a platform device ID table with multiple device entries,
> each setting a different register address in its driver_data to control
> the WLED brightness.
> 
> But the driver doesn't export these as aliases with MODULE_DEVICE_TABLE()
> when the driver is built as a module, instead it just has a single alias
> using MODULE_ALIAS("platform:da9052-backlight"). That is clearly wrong
> since there isn't a "da9052-backlight" in the platform device ID table,
> so if that device name is used, the device won't even match the driver.
> 
> So instead of having a wrong alias, export the ones in the dev ID table.
> 
> Before this patch:
> 
> $ modinfo drivers/video/backlight/da9052_bl.ko | grep alias
> alias:          platform:da9052-backlight
> 
> After this patch:
> 
> $ modinfo drivers/video/backlight/da9052_bl.ko | grep alias
> alias:          platform:da9052-wled3
> alias:          platform:da9052-wled2
> alias:          platform:da9052-wled1
> 
> Signed-off-by: Javier Martinez Canillas <javier@....samsung.com>
> ---
> 
>  drivers/video/backlight/da9052_bl.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Applied, thanks.

> diff --git a/drivers/video/backlight/da9052_bl.c b/drivers/video/backlight/da9052_bl.c
> index fd2be417aa64..49035c12739a 100644
> --- a/drivers/video/backlight/da9052_bl.c
> +++ b/drivers/video/backlight/da9052_bl.c
> @@ -167,6 +167,7 @@ static const struct platform_device_id da9052_wled_ids[] = {
>  	},
>  	{ },
>  };
> +MODULE_DEVICE_TABLE(platform, da9052_wled_ids);
>  
>  static struct platform_driver da9052_wled_driver = {
>  	.probe		= da9052_backlight_probe,
> @@ -182,4 +183,3 @@ module_platform_driver(da9052_wled_driver);
>  MODULE_AUTHOR("David Dajun Chen <dchen@...semi.com>");
>  MODULE_DESCRIPTION("Backlight driver for DA9052 PMIC");
>  MODULE_LICENSE("GPL");
> -MODULE_ALIAS("platform:da9052-backlight");

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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