From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> To: gregkh@linuxfoundation.org, robh+dt@kernel.org, mark.rutland@arm.com Cc: heikki.krogerus@linux.intel.com, hdegoede@redhat.com, andy.shevchenko@gmail.com, linux-usb@vger.kernel.org, linux-renesas-soc@vger.kernel.org, devicetree@vger.kernel.org, Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Subject: [PATCH/RFC v2 3/6] usb: common: roles: add a new API to find the graph Date: Thu, 26 Apr 2018 20:26:43 +0900 [thread overview] Message-ID: <1524742006-17984-4-git-send-email-yoshihiro.shimoda.uh@renesas.com> (raw) In-Reply-To: <1524742006-17984-1-git-send-email-yoshihiro.shimoda.uh@renesas.com> This patch adds a new API "usb_role_switch_get_by_graph()" to find device connection by using graph. Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> --- drivers/usb/common/roles.c | 30 ++++++++++++++++++++++++++++++ include/linux/usb/role.h | 2 ++ 2 files changed, 32 insertions(+) diff --git a/drivers/usb/common/roles.c b/drivers/usb/common/roles.c index 15cc76e..9fa26c1 100644 --- a/drivers/usb/common/roles.c +++ b/drivers/usb/common/roles.c @@ -114,6 +114,36 @@ struct usb_role_switch *usb_role_switch_get(struct device *dev) } EXPORT_SYMBOL_GPL(usb_role_switch_get); +static int by_graph_match(struct device *dev, void *parent) +{ + return dev->parent == parent; +} + +/** + * usb_role_switch_get_by_graph - Find USB role switch linked with the caller + * @dev: The caller device + * @port: identifier of the @dev port node + * @endpoint: identifier of the @dev endpoint node + * + * Finds and returns role switch linked with @dev, port and endpoint. + * The reference count for the found switch is incremented. + */ +struct usb_role_switch *usb_role_switch_get_by_graph(struct device *dev, + u32 port, u32 endpoint) +{ + struct device *conn; + struct device *sw; + + conn = device_connection_find_by_graph(dev, port, endpoint); + if (IS_ERR_OR_NULL(conn)) + return ERR_PTR(-EPROBE_DEFER); + + sw = device_find_child(conn, conn, by_graph_match); + + return !IS_ERR(sw) ? to_role_switch(sw) : ERR_PTR(-EPROBE_DEFER); +} +EXPORT_SYMBOL_GPL(usb_role_switch_get_by_graph); + /** * 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 edc51be..6573fdd 100644 --- a/include/linux/usb/role.h +++ b/include/linux/usb/role.h @@ -43,6 +43,8 @@ struct usb_role_switch_desc { 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); +struct usb_role_switch *usb_role_switch_get_by_graph(struct device *dev, + u32 port, u32 endpoint); void usb_role_switch_put(struct usb_role_switch *sw); struct usb_role_switch * -- 1.9.1
WARNING: multiple messages have this Message-ID (diff)
From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> To: gregkh@linuxfoundation.org, robh+dt@kernel.org, mark.rutland@arm.com Cc: heikki.krogerus@linux.intel.com, hdegoede@redhat.com, andy.shevchenko@gmail.com, linux-usb@vger.kernel.org, linux-renesas-soc@vger.kernel.org, devicetree@vger.kernel.org, Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Subject: [PATCH/RFC,v2,3/6] usb: common: roles: add a new API to find the graph Date: Thu, 26 Apr 2018 20:26:43 +0900 [thread overview] Message-ID: <1524742006-17984-4-git-send-email-yoshihiro.shimoda.uh@renesas.com> (raw) This patch adds a new API "usb_role_switch_get_by_graph()" to find device connection by using graph. Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> --- drivers/usb/common/roles.c | 30 ++++++++++++++++++++++++++++++ include/linux/usb/role.h | 2 ++ 2 files changed, 32 insertions(+) diff --git a/drivers/usb/common/roles.c b/drivers/usb/common/roles.c index 15cc76e..9fa26c1 100644 --- a/drivers/usb/common/roles.c +++ b/drivers/usb/common/roles.c @@ -114,6 +114,36 @@ struct usb_role_switch *usb_role_switch_get(struct device *dev) } EXPORT_SYMBOL_GPL(usb_role_switch_get); +static int by_graph_match(struct device *dev, void *parent) +{ + return dev->parent == parent; +} + +/** + * usb_role_switch_get_by_graph - Find USB role switch linked with the caller + * @dev: The caller device + * @port: identifier of the @dev port node + * @endpoint: identifier of the @dev endpoint node + * + * Finds and returns role switch linked with @dev, port and endpoint. + * The reference count for the found switch is incremented. + */ +struct usb_role_switch *usb_role_switch_get_by_graph(struct device *dev, + u32 port, u32 endpoint) +{ + struct device *conn; + struct device *sw; + + conn = device_connection_find_by_graph(dev, port, endpoint); + if (IS_ERR_OR_NULL(conn)) + return ERR_PTR(-EPROBE_DEFER); + + sw = device_find_child(conn, conn, by_graph_match); + + return !IS_ERR(sw) ? to_role_switch(sw) : ERR_PTR(-EPROBE_DEFER); +} +EXPORT_SYMBOL_GPL(usb_role_switch_get_by_graph); + /** * 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 edc51be..6573fdd 100644 --- a/include/linux/usb/role.h +++ b/include/linux/usb/role.h @@ -43,6 +43,8 @@ struct usb_role_switch_desc { 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); +struct usb_role_switch *usb_role_switch_get_by_graph(struct device *dev, + u32 port, u32 endpoint); void usb_role_switch_put(struct usb_role_switch *sw); struct usb_role_switch *
next prev parent reply other threads:[~2018-04-26 11:26 UTC|newest] Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-04-26 11:26 [PATCH/RFC v2 0/6] usb: role: rcar-usb3-role-switch: add support for R-Car SoCs Yoshihiro Shimoda 2018-04-26 11:26 ` [PATCH/RFC v2 1/6] dt-bindings: usb: add Renesas R-Car USB 3.0 role switch Yoshihiro Shimoda 2018-04-26 11:26 ` [PATCH/RFC,v2,1/6] " Yoshihiro Shimoda 2018-04-27 20:05 ` [PATCH/RFC v2 1/6] " Rob Herring 2018-04-27 20:05 ` [PATCH/RFC,v2,1/6] " Rob Herring 2018-05-08 2:43 ` [PATCH/RFC v2 1/6] " Yoshihiro Shimoda 2018-05-08 2:43 ` [PATCH/RFC,v2,1/6] " Yoshihiro Shimoda 2018-05-11 16:07 ` [PATCH/RFC v2 1/6] " Rob Herring 2018-05-11 16:07 ` [PATCH/RFC,v2,1/6] " Rob Herring 2018-05-14 2:31 ` [PATCH/RFC v2 1/6] " Yoshihiro Shimoda 2018-05-14 2:31 ` [PATCH/RFC,v2,1/6] " Yoshihiro Shimoda 2018-04-26 11:26 ` [PATCH/RFC v2 2/6] base: devcon: add a new API to find the graph Yoshihiro Shimoda 2018-04-26 11:26 ` [PATCH/RFC,v2,2/6] " Yoshihiro Shimoda 2018-04-26 11:26 ` Yoshihiro Shimoda [this message] 2018-04-26 11:26 ` [PATCH/RFC,v2,3/6] usb: common: roles: " Yoshihiro Shimoda 2018-04-26 11:26 ` [PATCH/RFC v2 4/6] usb: role: rcar-usb3-role-switch: add support for R-Car SoCs Yoshihiro Shimoda 2018-04-26 11:26 ` [PATCH/RFC,v2,4/6] " Yoshihiro Shimoda 2018-04-26 11:26 ` [PATCH/RFC v2 5/6] usb: gadget: udc: renesas_usb3: add support for a usb role switch Yoshihiro Shimoda 2018-04-26 11:26 ` [PATCH/RFC,v2,5/6] " Yoshihiro Shimoda 2018-04-26 11:26 ` [PATCH/RFC v2 6/6] arm64: dts: renesas: r8a7795: add OF graph for " Yoshihiro Shimoda 2018-04-26 11:26 ` [PATCH/RFC,v2,6/6] " Yoshihiro Shimoda
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