[v4,4/6] usb: roles: add API to get usb_role_switch by node
diff mbox series

Message ID 1556261237-13823-5-git-send-email-chunfeng.yun@mediatek.com
State Superseded
Headers show
Series
  • add USB Type-B GPIO connector driver
Related show

Commit Message

Chunfeng Yun April 26, 2019, 6:47 a.m. UTC
Add fwnode_usb_role_switch_get() to make easier to get
usb_role_switch by fwnode which register it.
It's useful when there is not device_connection registered
between two drivers and only knows the fwnode which register
usb_role_switch.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
v4 changes:
  1. use switch_fwnode_match() to find fwnode suggested by Heikki
  2. this patch now depends on [1]

 [1] [v6,08/13] usb: roles: Introduce stubs for the exiting functions in role.h
    https://patchwork.kernel.org/patch/10909971/

v3 changes:
  1. use fwnodes instead of node suggested by Andy
  2. rebuild the API suggested by Heikki

v2 no changes
---
 drivers/usb/roles/class.c | 25 +++++++++++++++++++++++++
 include/linux/usb/role.h  |  8 ++++++++
 2 files changed, 33 insertions(+)

Comments

Biju Das April 26, 2019, 7:02 a.m. UTC | #1
Hi Chunfeng Yun,

Thanks for the patch.

> Subject: [PATCH v4 4/6] usb: roles: add API to get usb_role_switch by node
> 
> Add fwnode_usb_role_switch_get() to make easier to get usb_role_switch
> by fwnode which register it.
> It's useful when there is not device_connection registered between two
> drivers and only knows the fwnode which register usb_role_switch.
> 
> Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Tested-by: Biju Das <biju.das@bp.renesas.com>
> ---
> v4 changes:
>   1. use switch_fwnode_match() to find fwnode suggested by Heikki
>   2. this patch now depends on [1]
> 
>  [1] [v6,08/13] usb: roles: Introduce stubs for the exiting functions in role.h
>     https://patchwork.kernel.org/patch/10909971/
> 
> v3 changes:
>   1. use fwnodes instead of node suggested by Andy
>   2. rebuild the API suggested by Heikki
> 
> v2 no changes
> ---
>  drivers/usb/roles/class.c | 25 +++++++++++++++++++++++++
> include/linux/usb/role.h  |  8 ++++++++
>  2 files changed, 33 insertions(+)
> 
> diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c index
> f45d8df5cfb8..994fcb979795 100644
> --- a/drivers/usb/roles/class.c
> +++ b/drivers/usb/roles/class.c
> @@ -12,6 +12,7 @@
>  #include <linux/device.h>
>  #include <linux/module.h>
>  #include <linux/mutex.h>
> +#include <linux/of.h>

Is it required?

>  #include <linux/slab.h>
> 
>  static struct class *role_class;
> @@ -135,6 +136,30 @@ struct usb_role_switch *usb_role_switch_get(struct
> device *dev)  }  EXPORT_SYMBOL_GPL(usb_role_switch_get);
> 
> +/**
> + * fwnode_usb_role_switch_get - Find USB role switch by it's parent
> +fwnode
> + * @fwnode: The fwnode that register USB role switch
> + *
> + * Finds and returns role switch registered by @fwnode. The reference
> +count
> + * for the found switch is incremented.
> + */
> +struct usb_role_switch *
> +fwnode_usb_role_switch_get(struct fwnode_handle *fwnode) {
> +	struct usb_role_switch *sw;
> +	struct device *dev;
> +
> +	dev = class_find_device(role_class, NULL, fwnode,
> switch_fwnode_match);
> +	if (!dev)
> +		return ERR_PTR(-EPROBE_DEFER);
> +
> +	sw = to_role_switch(dev);
> +	WARN_ON(!try_module_get(sw->dev.parent->driver->owner));
> +
> +	return sw;
> +}
> +EXPORT_SYMBOL_GPL(fwnode_usb_role_switch_get);
> +
>  /**
>   * usb_role_switch_put - Release handle to a switch
>   * @sw: USB Role Switch
> diff --git a/include/linux/usb/role.h b/include/linux/usb/role.h index
> da2b9641b877..35d460f9ec40 100644
> --- a/include/linux/usb/role.h
> +++ b/include/linux/usb/role.h
> @@ -48,6 +48,8 @@ int usb_role_switch_set_role(struct usb_role_switch
> *sw, enum usb_role role);  enum usb_role usb_role_switch_get_role(struct
> usb_role_switch *sw);  struct usb_role_switch *c(struct
> device *dev);  void usb_role_switch_put(struct usb_role_switch *sw);
> +struct usb_role_switch *
> +fwnode_usb_role_switch_get(struct fwnode_handle *fwnode);

>  struct usb_role_switch *
>  usb_role_switch_register(struct device *parent, @@ -72,6 +74,12 @@ static
> inline struct usb_role_switch *usb_role_switch_get(struct device *dev)
> 
>  static inline void usb_role_switch_put(struct usb_role_switch *sw) { }
> 
> +static inline struct usb_role_switch *
> +fwnode_usb_role_switch_get(struct fwnode_handle *fwnode) {
> +	return ERR_PTR(-ENODEV);
> +}
> +

>  static inline struct usb_role_switch *
>  usb_role_switch_register(struct device *parent,
>  			 const struct usb_role_switch_desc *desc)
> --
> 2.21.0
Chunfeng Yun April 26, 2019, 7:16 a.m. UTC | #2
Hi Biju,
On Fri, 2019-04-26 at 07:02 +0000, Biju Das wrote:
> Hi Chunfeng Yun,
> 
> Thanks for the patch.
> 
> > Subject: [PATCH v4 4/6] usb: roles: add API to get usb_role_switch by node
> > 
> > Add fwnode_usb_role_switch_get() to make easier to get usb_role_switch
> > by fwnode which register it.
> > It's useful when there is not device_connection registered between two
> > drivers and only knows the fwnode which register usb_role_switch.
> > 
> > Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
> Tested-by: Biju Das <biju.das@bp.renesas.com>
> > ---
> > v4 changes:
> >   1. use switch_fwnode_match() to find fwnode suggested by Heikki
> >   2. this patch now depends on [1]
> > 
> >  [1] [v6,08/13] usb: roles: Introduce stubs for the exiting functions in role.h
> >     https://patchwork.kernel.org/patch/10909971/
> > 
> > v3 changes:
> >   1. use fwnodes instead of node suggested by Andy
> >   2. rebuild the API suggested by Heikki
> > 
> > v2 no changes
> > ---
> >  drivers/usb/roles/class.c | 25 +++++++++++++++++++++++++
> > include/linux/usb/role.h  |  8 ++++++++
> >  2 files changed, 33 insertions(+)
> > 
> > diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c index
> > f45d8df5cfb8..994fcb979795 100644
> > --- a/drivers/usb/roles/class.c
> > +++ b/drivers/usb/roles/class.c
> > @@ -12,6 +12,7 @@
> >  #include <linux/device.h>
> >  #include <linux/module.h>
> >  #include <linux/mutex.h>
> > +#include <linux/of.h>
> 
> Is it required?
Forgot to remove it after using fwnode instead of node, will remove it
in next version

Thanks a lot

> 
> >  #include <linux/slab.h>
> > 
> >  static struct class *role_class;
> > @@ -135,6 +136,30 @@ struct usb_role_switch *usb_role_switch_get(struct
> > device *dev)  }  EXPORT_SYMBOL_GPL(usb_role_switch_get);
> > 
> > +/**
> > + * fwnode_usb_role_switch_get - Find USB role switch by it's parent
> > +fwnode
> > + * @fwnode: The fwnode that register USB role switch
> > + *
> > + * Finds and returns role switch registered by @fwnode. The reference
> > +count
> > + * for the found switch is incremented.
> > + */
> > +struct usb_role_switch *
> > +fwnode_usb_role_switch_get(struct fwnode_handle *fwnode) {
> > +	struct usb_role_switch *sw;
> > +	struct device *dev;
> > +
> > +	dev = class_find_device(role_class, NULL, fwnode,
> > switch_fwnode_match);
> > +	if (!dev)
> > +		return ERR_PTR(-EPROBE_DEFER);
> > +
> > +	sw = to_role_switch(dev);
> > +	WARN_ON(!try_module_get(sw->dev.parent->driver->owner));
> > +
> > +	return sw;
> > +}
> > +EXPORT_SYMBOL_GPL(fwnode_usb_role_switch_get);
> > +
> >  /**
> >   * usb_role_switch_put - Release handle to a switch
> >   * @sw: USB Role Switch
> > diff --git a/include/linux/usb/role.h b/include/linux/usb/role.h index
> > da2b9641b877..35d460f9ec40 100644
> > --- a/include/linux/usb/role.h
> > +++ b/include/linux/usb/role.h
> > @@ -48,6 +48,8 @@ int usb_role_switch_set_role(struct usb_role_switch
> > *sw, enum usb_role role);  enum usb_role usb_role_switch_get_role(struct
> > usb_role_switch *sw);  struct usb_role_switch *c(struct
> > device *dev);  void usb_role_switch_put(struct usb_role_switch *sw);
> > +struct usb_role_switch *
> > +fwnode_usb_role_switch_get(struct fwnode_handle *fwnode);
> 
> >  struct usb_role_switch *
> >  usb_role_switch_register(struct device *parent, @@ -72,6 +74,12 @@ static
> > inline struct usb_role_switch *usb_role_switch_get(struct device *dev)
> > 
> >  static inline void usb_role_switch_put(struct usb_role_switch *sw) { }
> > 
> > +static inline struct usb_role_switch *
> > +fwnode_usb_role_switch_get(struct fwnode_handle *fwnode) {
> > +	return ERR_PTR(-ENODEV);
> > +}
> > +
> 
> >  static inline struct usb_role_switch *
> >  usb_role_switch_register(struct device *parent,
> >  			 const struct usb_role_switch_desc *desc)
> > --
> > 2.21.0
>

Patch
diff mbox series

diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c
index f45d8df5cfb8..994fcb979795 100644
--- a/drivers/usb/roles/class.c
+++ b/drivers/usb/roles/class.c
@@ -12,6 +12,7 @@ 
 #include <linux/device.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
+#include <linux/of.h>
 #include <linux/slab.h>
 
 static struct class *role_class;
@@ -135,6 +136,30 @@  struct usb_role_switch *usb_role_switch_get(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(usb_role_switch_get);
 
+/**
+ * fwnode_usb_role_switch_get - Find USB role switch by it's parent fwnode
+ * @fwnode: The fwnode that register USB role switch
+ *
+ * Finds and returns role switch registered by @fwnode. The reference count
+ * for the found switch is incremented.
+ */
+struct usb_role_switch *
+fwnode_usb_role_switch_get(struct fwnode_handle *fwnode)
+{
+	struct usb_role_switch *sw;
+	struct device *dev;
+
+	dev = class_find_device(role_class, NULL, fwnode, switch_fwnode_match);
+	if (!dev)
+		return ERR_PTR(-EPROBE_DEFER);
+
+	sw = to_role_switch(dev);
+	WARN_ON(!try_module_get(sw->dev.parent->driver->owner));
+
+	return sw;
+}
+EXPORT_SYMBOL_GPL(fwnode_usb_role_switch_get);
+
 /**
  * usb_role_switch_put - Release handle to a switch
  * @sw: USB Role Switch
diff --git a/include/linux/usb/role.h b/include/linux/usb/role.h
index da2b9641b877..35d460f9ec40 100644
--- a/include/linux/usb/role.h
+++ b/include/linux/usb/role.h
@@ -48,6 +48,8 @@  int usb_role_switch_set_role(struct usb_role_switch *sw, enum usb_role role);
 enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw);
 struct usb_role_switch *usb_role_switch_get(struct device *dev);
 void usb_role_switch_put(struct usb_role_switch *sw);
+struct usb_role_switch *
+fwnode_usb_role_switch_get(struct fwnode_handle *fwnode);
 
 struct usb_role_switch *
 usb_role_switch_register(struct device *parent,
@@ -72,6 +74,12 @@  static inline struct usb_role_switch *usb_role_switch_get(struct device *dev)
 
 static inline void usb_role_switch_put(struct usb_role_switch *sw) { }
 
+static inline struct usb_role_switch *
+fwnode_usb_role_switch_get(struct fwnode_handle *fwnode)
+{
+	return ERR_PTR(-ENODEV);
+}
+
 static inline struct usb_role_switch *
 usb_role_switch_register(struct device *parent,
 			 const struct usb_role_switch_desc *desc)