Introduce usb_otg_add/remove_hcd() for use by host
controllers that are part of OTG/dual-role port.
Non Device tree platforms can use the otg_dev argument
to specify the OTG controller device. If otg_dev is NULL
then the device tree node's otg-controller property is used to
get the otg_dev device.
Signed-off-by: Roger Quadros <rogerq@xxxxxx>
---
drivers/usb/core/hcd.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/usb/hcd.h | 4 +++
2 files changed, 75 insertions(+)
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 6b1930d..6a80193 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -46,6 +46,10 @@
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include <linux/usb/phy.h>
+#include <linux/usb/otg.h>
+
+#include <linux/of.h>
+#include <linux/of_platform.h>
#include "usb.h"
@@ -3013,6 +3017,73 @@ void usb_remove_hcd(struct usb_hcd *hcd)
}
EXPORT_SYMBOL_GPL(usb_remove_hcd);
+
+static struct otg_hcd_ops otg_hcd_intf = {
+ .add = usb_add_hcd,
+ .remove = usb_remove_hcd,
+ .usb_bus_start_enum = usb_bus_start_enum,
+ .usb_control_msg = usb_control_msg,
+ .usb_hub_find_child = usb_hub_find_child,
+};
+
+/**
+ * usb_otg_add_hcd - Register the HCD with OTG core.
+ * @hcd: the usb_hcd structure to initialize
+ * @irqnum: Interrupt line to allocate
+ * @irqflags: Interrupt type flags
+ * @otg_dev: OTG controller device manging this HCD
+ *
+ * Registers the HCD with OTG core. OTG core will call usb_add_hcd()
+ * or usb_remove_hcd() as necessary.
+ * If otg_dev is NULL then device tree node is checked for OTG
+ * controller device via the otg-controller property.
+ */
+int usb_otg_add_hcd(struct usb_hcd *hcd,
+ unsigned int irqnum, unsigned long irqflags,
+ struct device *otg_dev)
+{
+ struct device *dev = hcd->self.controller;
+
+ if (!otg_dev) {
+ struct device_node *np;
+ struct platform_device *pdev;
+
+ np = of_parse_phandle(dev->of_node, "otg-controller", 0);
+ if (!np) {
+ dev_err(dev,
+ "otg_dev is NULL and no otg-controller property in DT\n");
+ return -EINVAL;
+ }
+
+ pdev = of_find_device_by_node(np);
+ of_node_put(np);
+ if (!pdev) {
+ dev_err(dev,
+ "couldn't get otg-controller device\n");
+ return -ENODEV;
+ }
+
+ hcd->otg_dev = &pdev->dev;
+ } else {
+ hcd->otg_dev = otg_dev;
+ }
+
+ return usb_otg_register_hcd(hcd, irqnum, irqflags, &otg_hcd_intf);
+}
+EXPORT_SYMBOL_GPL(usb_otg_add_hcd);
+
+/**
+ * usb_otg_remove_hcd - Unregister the HCD with OTG core.
+ * @hcd: the usb_hcd structure to remove
+ *
+ * Unregisters the HCD from the OTG core.
+ */
+void usb_otg_remove_hcd(struct usb_hcd *hcd)
+{
+ usb_otg_unregister_hcd(hcd);
+}
+EXPORT_SYMBOL_GPL(usb_otg_remove_hcd);
+
void
usb_hcd_platform_shutdown(struct platform_device *dev)
{
diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
index 2017cd4..adcf2e7 100644
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -472,6 +472,10 @@ extern int usb_hcd_is_primary_hcd(struct usb_hcd *hcd);
extern int usb_add_hcd(struct usb_hcd *hcd,
unsigned int irqnum, unsigned long irqflags);
extern void usb_remove_hcd(struct usb_hcd *hcd);
+extern int usb_otg_add_hcd(struct usb_hcd *hcd,
+ unsigned int irqnum, unsigned long irqflags,
+ struct device *otg_dev);
+extern void usb_otg_remove_hcd(struct usb_hcd *hcd);
extern int usb_hcd_find_raw_port_number(struct usb_hcd *hcd, int port1);
struct platform_device;
--
2.5.0
--
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