[PATCH] usb: kbd: Also accept keyboards with Interrupt OUT endpoint

[Stefan Brüns]

The OUT endpoint can just be ignored as it is not used, just as the
corresponding Set_Report request for IN-only interfaces. E.g. the
Linux gadget hid keyboard also provides an interrupt endpoint.

Also cleanup confusing debug messages like "found set protocol", which
is printed when a keyboard device is found, while the Set_Protocol request
is issued quite some time later.

Signed-off-by: Stefan Brüns <stefan.bruens at rwth-aachen.de>
---
 common/usb_kbd.c | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/common/usb_kbd.c b/common/usb_kbd.c
index 60c6027e04..afad260d3d 100644
--- a/common/usb_kbd.c
+++ b/common/usb_kbd.c
@@ -443,6 +443,7 @@ static int usb_kbd_probe_dev(struct usb_device *dev, unsigned int ifnum)
 	struct usb_interface *iface;
 	struct usb_endpoint_descriptor *ep;
 	struct usb_kbd_pdata *data;
+	int epNum;
 
 	if (dev->descriptor.bNumConfigurations != 1)
 		return 0;
@@ -458,19 +459,21 @@ static int usb_kbd_probe_dev(struct usb_device *dev, unsigned int ifnum)
 	if (iface->desc.bInterfaceProtocol != USB_PROT_HID_KEYBOARD)
 		return 0;
 
-	if (iface->desc.bNumEndpoints != 1)
-		return 0;
+	for (epNum = 0; epNum < iface->desc.bNumEndpoints; epNum++) {
+		ep = &iface->ep_desc[epNum];
 
-	ep = &iface->ep_desc[0];
+		/* Check if endpoint is interrupt IN endpoint */
+		if ((ep->bmAttributes & 3) != 3)
+			continue;
 
-	/* Check if endpoint 1 is interrupt endpoint */
-	if (!(ep->bEndpointAddress & 0x80))
-		return 0;
+		if (ep->bEndpointAddress & 0x80)
+			break;
+	}
 
-	if ((ep->bmAttributes & 3) != 3)
+	if (epNum == iface->desc.bNumEndpoints)
 		return 0;
 
-	debug("USB KBD: found set protocol...\n");
+	debug("USB KBD: found interrupt EP: 0x%x\n", ep->bEndpointAddress);
 
 	data = malloc(sizeof(struct usb_kbd_pdata));
 	if (!data) {
@@ -498,13 +501,15 @@ static int usb_kbd_probe_dev(struct usb_device *dev, unsigned int ifnum)
 	data->last_report = -1;
 
 	/* We found a USB Keyboard, install it. */
+	debug("USB KBD: set boot protocol\n");
 	usb_set_protocol(dev, iface->desc.bInterfaceNumber, 0);
 
-	debug("USB KBD: found set idle...\n");
 #if !defined(CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP) && \
     !defined(CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE)
+	debug("USB KBD: set idle interval...\n");
 	usb_set_idle(dev, iface->desc.bInterfaceNumber, REPEAT_RATE / 4, 0);
 #else
+	debug("USB KBD: set idle interval=0...\n");
 	usb_set_idle(dev, iface->desc.bInterfaceNumber, 0, 0);
 #endif
 
-- 
2.30.1