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

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Date:   Tue, 3 Jan 2017 14:11:33 +0000
From:   Adam Thomson <Adam.Thomson.Opensource@...semi.com>
To:     Javier Martinez Canillas <javier@....samsung.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Support Opensource <Support.Opensource@...semi.com>,
        Lee Jones <lee.jones@...aro.org>
Subject: RE: [PATCH] backlight: da9052: Fix module autoload

On 02 January 2017 16:03, 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>
> ---

Acked-by: Adam Thomson <Adam.Thomson.Opensource@...semi.com>