linux-kernel - Re: [PATCH 1/2] usb: typec: mux: Use device type instead of device name for matching

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Message-ID: <YLSQkynoJO2+hYGW@kuha.fi.intel.com>
Date:   Mon, 31 May 2021 10:30:27 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hans de Goede <hdegoede@...hat.com>, Li Jun <jun.li@....com>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] usb: typec: mux: Use device type instead of device
 name for matching

On Wed, May 26, 2021 at 06:35:47PM +0300, Heikki Krogerus wrote:
> Both the USB Type-C switch and mux have already a device
> type defined for them. We can use those types instead of the
> device name to differentiate the two.

This should still be OK, right?

> Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> ---
>  drivers/usb/typec/mux.c | 26 ++++++++++----------------
>  drivers/usb/typec/mux.h |  6 ++++++
>  2 files changed, 16 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/usb/typec/mux.c b/drivers/usb/typec/mux.c
> index 8514bec7e1b89..e40a555724fb6 100644
> --- a/drivers/usb/typec/mux.c
> +++ b/drivers/usb/typec/mux.c
> @@ -17,21 +17,12 @@
>  #include "class.h"
>  #include "mux.h"
>  
> -static bool dev_name_ends_with(struct device *dev, const char *suffix)
> -{
> -	const char *name = dev_name(dev);
> -	const int name_len = strlen(name);
> -	const int suffix_len = strlen(suffix);
> -
> -	if (suffix_len > name_len)
> -		return false;
> -
> -	return strcmp(name + (name_len - suffix_len), suffix) == 0;
> -}
> -
>  static int switch_fwnode_match(struct device *dev, const void *fwnode)
>  {
> -	return dev_fwnode(dev) == fwnode && dev_name_ends_with(dev, "-switch");
> +	if (!is_typec_switch(dev))
> +		return 0;
> +
> +	return dev_fwnode(dev) == fwnode;
>  }
>  
>  static void *typec_switch_match(struct fwnode_handle *fwnode, const char *id,
> @@ -90,7 +81,7 @@ static void typec_switch_release(struct device *dev)
>  	kfree(to_typec_switch(dev));
>  }
>  
> -static const struct device_type typec_switch_dev_type = {
> +const struct device_type typec_switch_dev_type = {
>  	.name = "orientation_switch",
>  	.release = typec_switch_release,
>  };
> @@ -180,7 +171,10 @@ EXPORT_SYMBOL_GPL(typec_switch_get_drvdata);
>  
>  static int mux_fwnode_match(struct device *dev, const void *fwnode)
>  {
> -	return dev_fwnode(dev) == fwnode && dev_name_ends_with(dev, "-mux");
> +	if (!is_typec_mux(dev))
> +		return 0;
> +
> +	return dev_fwnode(dev) == fwnode;
>  }
>  
>  static void *typec_mux_match(struct fwnode_handle *fwnode, const char *id,
> @@ -295,7 +289,7 @@ static void typec_mux_release(struct device *dev)
>  	kfree(to_typec_mux(dev));
>  }
>  
> -static const struct device_type typec_mux_dev_type = {
> +const struct device_type typec_mux_dev_type = {
>  	.name = "mode_switch",
>  	.release = typec_mux_release,
>  };
> diff --git a/drivers/usb/typec/mux.h b/drivers/usb/typec/mux.h
> index 4fd9426ee44f6..b1d6e837cb747 100644
> --- a/drivers/usb/typec/mux.h
> +++ b/drivers/usb/typec/mux.h
> @@ -18,4 +18,10 @@ struct typec_mux {
>  #define to_typec_switch(_dev_) container_of(_dev_, struct typec_switch, dev)
>  #define to_typec_mux(_dev_) container_of(_dev_, struct typec_mux, dev)
>  
> +extern const struct device_type typec_switch_dev_type;
> +extern const struct device_type typec_mux_dev_type;
> +
> +#define is_typec_switch(dev) ((dev)->type == &typec_switch_dev_type)
> +#define is_typec_mux(dev) ((dev)->type == &typec_mux_dev_type)
> +
>  #endif /* __USB_TYPEC_MUX__ */
> -- 
> 2.30.2

-- 
heikki