| Message ID | 1554257354-7440-5-git-send-email-chunfeng.yun@mediatek.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | add USB Type-B GPIO connector driver | expand |
On Wed, Apr 03, 2019 at 10:09:12AM +0800, Chunfeng Yun wrote: > 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> > --- > 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 | 31 +++++++++++++++++++++++++++++++ > include/linux/usb/role.h | 2 ++ > 2 files changed, 33 insertions(+) > > diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c > index f45d8df5cfb8..5ecb57f8960b 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 +136,36 @@ struct usb_role_switch *usb_role_switch_get(struct device *dev) > } > EXPORT_SYMBOL_GPL(usb_role_switch_get); > > +static int __switch_match_fwnode(struct device *dev, const void *fwnode) > +{ > + return dev_fwnode(dev->parent) == (const struct fwnode_handle *)fwnode; > +} I don't think this is actually needed. Why not just assign the parent's fwnode for the mux as well? I'll add an example to the patch 6/6 in this series. > +/** > + * 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_match_fwnode); So here you can then reuse switch_fwnode_match(): 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 c05ffa6abda9..d21cd55d9e45 100644 > --- a/include/linux/usb/role.h > +++ b/include/linux/usb/role.h > @@ -46,6 +46,8 @@ 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, > -- > 2.20.1 thanks,
On Wed, 2019-04-10 at 13:22 +0300, Heikki Krogerus wrote: > On Wed, Apr 03, 2019 at 10:09:12AM +0800, Chunfeng Yun wrote: > > 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> > > --- > > 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 | 31 +++++++++++++++++++++++++++++++ > > include/linux/usb/role.h | 2 ++ > > 2 files changed, 33 insertions(+) > > > > diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c > > index f45d8df5cfb8..5ecb57f8960b 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 +136,36 @@ struct usb_role_switch *usb_role_switch_get(struct device *dev) > > } > > EXPORT_SYMBOL_GPL(usb_role_switch_get); > > > > +static int __switch_match_fwnode(struct device *dev, const void *fwnode) > > +{ > > + return dev_fwnode(dev->parent) == (const struct fwnode_handle *)fwnode; > > +} > > I don't think this is actually needed. Yes, you are right > Why not just assign the > parent's fwnode for the mux as well? will do it in next version > > I'll add an example to the patch 6/6 in this series. > > > +/** > > + * 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_match_fwnode); > > So here you can then reuse switch_fwnode_match(): > > dev = class_find_device(role_class, NULL, fwnode, switch_fwnode_match); I make a fast test, it works, thanks a lot Heikki > > > + 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 c05ffa6abda9..d21cd55d9e45 100644 > > --- a/include/linux/usb/role.h > > +++ b/include/linux/usb/role.h > > @@ -46,6 +46,8 @@ 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, > > -- > > 2.20.1 > > thanks, >
diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c index f45d8df5cfb8..5ecb57f8960b 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 +136,36 @@ struct usb_role_switch *usb_role_switch_get(struct device *dev) } EXPORT_SYMBOL_GPL(usb_role_switch_get); +static int __switch_match_fwnode(struct device *dev, const void *fwnode) +{ + return dev_fwnode(dev->parent) == (const struct fwnode_handle *)fwnode; +} + +/** + * 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_match_fwnode); + 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 c05ffa6abda9..d21cd55d9e45 100644 --- a/include/linux/usb/role.h +++ b/include/linux/usb/role.h @@ -46,6 +46,8 @@ 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,
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> --- 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 | 31 +++++++++++++++++++++++++++++++ include/linux/usb/role.h | 2 ++ 2 files changed, 33 insertions(+)