ChangeSet 1.1843.4.13, 2004/08/24 11:54:54-07:00, [EMAIL PROTECTED]
[PATCH] USB OTG: add usb_bus_start_enum() (1/5)
Define a new usb_bus_start_enum() routine that's available with OTG.
It starts immediate enumeration (port reset) and makes khubd wake up
later. Non-OTG code could start to use this, given some attention to
HC-specific reset timing issues.
Signed-off-by: David Brownell <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
drivers/usb/core/hcd.c | 39 +++++++++++++++++++++++++++++++++++++++
drivers/usb/core/hcd.h | 1 +
include/linux/usb_otg.h | 2 ++
3 files changed, 42 insertions(+)
diff -Nru a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
--- a/drivers/usb/core/hcd.c 2004-08-26 16:42:39 -07:00
+++ b/drivers/usb/core/hcd.c 2004-08-26 16:42:39 -07:00
@@ -1404,6 +1404,45 @@
/*-------------------------------------------------------------------------*/
+#ifdef CONFIG_USB_OTG
+
+/**
+ * usb_bus_start_enum - start immediate enumeration (for OTG)
+ * @bus: the bus (must use hcd framework)
+ * @port: 1-based number of port; usually bus->otg_port
+ * Context: in_interrupt()
+ *
+ * Starts enumeration, with an immediate reset followed later by
+ * khubd identifying and possibly configuring the device.
+ * This is needed by OTG controller drivers, where it helps meet
+ * HNP protocol timing requirements for starting a port reset.
+ */
+int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num)
+{
+ struct usb_hcd *hcd;
+ int status = -EOPNOTSUPP;
+
+ /* NOTE: since HNP can't start by grabbing the bus's address0_sem,
+ * boards with root hubs hooked up to internal devices (instead of
+ * just the OTG port) may need more attention to resetting...
+ */
+ hcd = container_of (bus, struct usb_hcd, self);
+ if (port_num && hcd->driver->start_port_reset)
+ status = hcd->driver->start_port_reset(hcd, port_num);
+
+ /* run khubd shortly after (first) root port reset finishes;
+ * it may issue others, until at least 50 msecs have passed.
+ */
+ if (status == 0)
+ mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(10));
+ return status;
+}
+EXPORT_SYMBOL (usb_bus_start_enum);
+
+#endif
+
+/*-------------------------------------------------------------------------*/
+
/* called by khubd, rmmod, apmd, or other thread for hcd-private cleanup.
* we're guaranteed that the device is fully quiesced. also, that each
* endpoint has been hcd_endpoint_disabled.
diff -Nru a/drivers/usb/core/hcd.h b/drivers/usb/core/hcd.h
--- a/drivers/usb/core/hcd.h 2004-08-26 16:42:39 -07:00
+++ b/drivers/usb/core/hcd.h 2004-08-26 16:42:39 -07:00
@@ -212,6 +212,7 @@
char *buf, u16 wLength);
int (*hub_suspend)(struct usb_hcd *);
int (*hub_resume)(struct usb_hcd *);
+ int (*start_port_reset)(struct usb_hcd *, unsigned port_num);
};
extern void usb_hcd_giveback_urb (struct usb_hcd *hcd, struct urb *urb, struct
pt_regs *regs);
diff -Nru a/include/linux/usb_otg.h b/include/linux/usb_otg.h
--- a/include/linux/usb_otg.h 2004-08-26 16:42:39 -07:00
+++ b/include/linux/usb_otg.h 2004-08-26 16:42:39 -07:00
@@ -114,3 +114,5 @@
}
+/* for OTG controller drivers (and maybe other stuff) */
+extern int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num);
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