[PATCH] drm/dsi: Add uevent callback

[Archit Taneja]

On 06/03/2016 08:58 PM, Thierry Reding wrote:
> From: Thierry Reding <treding at nvidia.com>
>
> Implement a uevent callback for devices on the MIPI DSI bus. This
> callback will append MODALIAS information to the uevent and allow
> modules to be loaded when devices are added to the bus.

Reviewed-by: Archit Taneja <architt at codeaurora.org>

>
> Signed-off-by: Thierry Reding <treding at nvidia.com>
> ---
>   drivers/gpu/drm/drm_mipi_dsi.c | 16 ++++++++++++++++
>   include/drm/drm_mipi_dsi.h     |  2 ++
>   2 files changed, 18 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
> index f5d80839a90c..2181699d5b3b 100644
> --- a/drivers/gpu/drm/drm_mipi_dsi.c
> +++ b/drivers/gpu/drm/drm_mipi_dsi.c
> @@ -60,6 +60,21 @@ static int mipi_dsi_device_match(struct device *dev, struct device_driver *drv)
>   	return 0;
>   }
>
> +static int mipi_dsi_uevent(struct device *dev, struct kobj_uevent_env *env)
> +{
> +	struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
> +	int err;
> +
> +	err = of_device_uevent_modalias(dev, env);
> +	if (err != -ENODEV)
> +		return err;
> +
> +	add_uevent_var(env, "MODALIAS=%s%s", MIPI_DSI_MODULE_PREFIX,
> +		       dsi->name);
> +
> +	return 0;
> +}
> +
>   static const struct dev_pm_ops mipi_dsi_device_pm_ops = {
>   	.runtime_suspend = pm_generic_runtime_suspend,
>   	.runtime_resume = pm_generic_runtime_resume,
> @@ -74,6 +89,7 @@ static const struct dev_pm_ops mipi_dsi_device_pm_ops = {
>   static struct bus_type mipi_dsi_bus_type = {
>   	.name = "mipi-dsi",
>   	.match = mipi_dsi_device_match,
> +	.uevent = mipi_dsi_uevent,
>   	.pm = &mipi_dsi_device_pm_ops,
>   };
>
> diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
> index 7a9840f8b38e..765c04348b7f 100644
> --- a/include/drm/drm_mipi_dsi.h
> +++ b/include/drm/drm_mipi_dsi.h
> @@ -180,6 +180,8 @@ struct mipi_dsi_device {
>   	unsigned long mode_flags;
>   };
>
> +#define MIPI_DSI_MODULE_PREFIX "mipi-dsi:"
> +
>   static inline struct mipi_dsi_device *to_mipi_dsi_device(struct device *dev)
>   {
>   	return container_of(dev, struct mipi_dsi_device, dev);
>

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