linux-kernel - Re: [PATCH 4/9] usb: roles: Leave the private driver data pointer to the drivers

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Date:   Sat, 15 Feb 2020 17:19:58 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Benson Leung <bleung@...omium.org>,
        Prashant Malani <pmalani@...omium.org>,
        "Mika Westerberg" <mika.westerberg@...ux.intel.com>,
        <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>
Subject: Re: [PATCH 4/9] usb: roles: Leave the private driver data pointer
 to the drivers

On Thu, 2020-02-13 at 16:24 +0300, Heikki Krogerus wrote:
> Adding usb_role_switch_get/set_drvdata() functions that the
> switch drivers can use for setting and getting private data
> pointer that is associated with the switch.
> 
> Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> ---
>  drivers/usb/roles/class.c | 22 ++++++++++++++++++++++
>  include/linux/usb/role.h  | 16 ++++++++++++++++
>  2 files changed, 38 insertions(+)
> 
> diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c
> index 63a00ff26655..f3132d231599 100644
> --- a/drivers/usb/roles/class.c
> +++ b/drivers/usb/roles/class.c
> @@ -329,6 +329,7 @@ usb_role_switch_register(struct device *parent,
>  	sw->dev.fwnode = desc->fwnode;
>  	sw->dev.class = role_class;
>  	sw->dev.type = &usb_role_dev_type;
> +	sw->dev.driver_data = desc->driver_data;
How about use dev_set_drvdata()? will keep align with
usb_role_switch_set/get_drvdata(), 

>  	dev_set_name(&sw->dev, "%s-role-switch", dev_name(parent));
>  
>  	ret = device_register(&sw->dev);
> @@ -356,6 +357,27 @@ void usb_role_switch_unregister(struct usb_role_switch *sw)
>  }
>  EXPORT_SYMBOL_GPL(usb_role_switch_unregister);
>  
> +/**
> + * usb_role_switch_set_drvdata - Assign private data pointer to a switch
> + * @sw: USB Role Switch
> + * @data: Private data pointer
> + */
> +void usb_role_switch_set_drvdata(struct usb_role_switch *sw, void *data)
> +{
> +	dev_set_drvdata(&sw->dev, data);
> +}
> +EXPORT_SYMBOL_GPL(usb_role_switch_set_drvdata);
> +
> +/**
> + * usb_role_switch_get_drvdata - Get the private data pointer of a switch
> + * @sw: USB Role Switch
> + */
> +void *usb_role_switch_get_drvdata(struct usb_role_switch *sw)
> +{
> +	return dev_get_drvdata(&sw->dev);
> +}
> +EXPORT_SYMBOL_GPL(usb_role_switch_get_drvdata);
> +
>  static int __init usb_roles_init(void)
>  {
>  	role_class = class_create(THIS_MODULE, "usb_role");
> diff --git a/include/linux/usb/role.h b/include/linux/usb/role.h
> index efac3af83d6b..02dae936cebd 100644
> --- a/include/linux/usb/role.h
> +++ b/include/linux/usb/role.h
> @@ -25,6 +25,7 @@ typedef enum usb_role (*usb_role_switch_get_t)(struct device *dev);
>   * @set: Callback for setting the role
>   * @get: Callback for getting the role (optional)
>   * @allow_userspace_control: If true userspace may change the role through sysfs
> + * @driver_data: Private data pointer
>   *
>   * @usb2_port and @usb3_port will point to the USB host port and @udc to the USB
>   * device controller behind the USB connector with the role switch. If
> @@ -40,6 +41,7 @@ struct usb_role_switch_desc {
>  	usb_role_switch_set_t set;
>  	usb_role_switch_get_t get;
>  	bool allow_userspace_control;
> +	void *driver_data;
>  };
>  
> 
> @@ -57,6 +59,9 @@ struct usb_role_switch *
>  usb_role_switch_register(struct device *parent,
>  			 const struct usb_role_switch_desc *desc);
>  void usb_role_switch_unregister(struct usb_role_switch *sw);
> +
> +void usb_role_switch_set_drvdata(struct usb_role_switch *sw, void *data);
> +void *usb_role_switch_get_drvdata(struct usb_role_switch *sw);
>  #else
>  static inline int usb_role_switch_set_role(struct usb_role_switch *sw,
>  		enum usb_role role)
> @@ -90,6 +95,17 @@ usb_role_switch_register(struct device *parent,
>  }
>  
>  static inline void usb_role_switch_unregister(struct usb_role_switch *sw) { }
> +
> +static inline void
> +usb_role_switch_set_drvdata(struct usb_role_switch *sw, void *data)
> +{
> +}
> +
> +static inline void *usb_role_switch_get_drvdata(struct usb_role_switch *sw)
> +{
> +	return NULL;
> +}
> +
>  #endif
>  
>  #endif /* __LINUX_USB_ROLE_H */