UPSTREAM: USB: Add functionality to poll the USB keyboard via control EP

This allows the keyboard to avoid requests via Interrupt Endpoint altogether and
run all requests via Control Endpoint. This uses the Get_Report request.

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Remy Bohmer <linux@bohmer.net>
(cherry picked from u-boot-usb.git
 commit 24e626cafd0793843c3e38439237c4031cef7ebf)

BUG=chrome-os-partner:5752
TEST=on Lumpy, use USB keyboard to enter commands on U-Boot command line.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>

Change-Id: I55a47a6193ff3c7ce55510ebea922e5223cfc29c
Reviewed-on: https://gerrit.chromium.org/gerrit/12511
Tested-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Stefan Reinauer <reinauer@chromium.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Commit-Ready: Vincent Palatin <vpalatin@chromium.org>

1 files changed, 50 insertions, 14 deletions

diff --git a/common/usb_kbd.c b/common/usb_kbd.c
index 9957dcc323..503d175a75 100644
--- a/common/usb_kbd.c
+++ b/common/usb_kbd.c
@@ -96,6 +96,26 @@ static unsigned char usb_kbd_numkey_shifted[] = {
 	 '+', '{', '}', '|', '~', ':', '"', '~', '<', '>', '?'
 };
 
+static int usb_kbd_irq_worker(struct usb_device *dev);
+
+/******************************************************************
+ * Interrupt polling
+ ******************************************************************/
+static inline void usb_kbd_poll_for_event(struct usb_device *dev)
+{
+#if	defined(CONFIG_SYS_USB_EVENT_POLL)
+	usb_event_poll();
+	usb_kbd_irq_worker(dev);
+#elif	defined(CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP)
+	struct usb_interface *iface;
+	iface = &dev->config.if_desc[0];
+	usb_get_report(dev, iface->desc.bInterfaceNumber,
+			1, 1, new, sizeof(new));
+	if (memcmp(old, new, sizeof(new)))
+		usb_kbd_irq_worker(dev);
+#endif
+}
+
 /******************************************************************
  * Queue handling
  ******************************************************************/
@@ -120,9 +140,14 @@ static void usb_kbd_put_queue(char data)
 /* test if a character is in the queue */
 static int usb_kbd_testc(void)
 {
-#ifdef CONFIG_SYS_USB_EVENT_POLL
-	usb_event_poll();
-#endif
+	struct stdio_dev *dev;
+	struct usb_device *usb_kbd_dev;
+
+	dev = stdio_get_by_name("usbkbd");
+	usb_kbd_dev = (struct usb_device *)dev->priv;
+
+	usb_kbd_poll_for_event(usb_kbd_dev);
+
 	if(usb_in_pointer==usb_out_pointer)
 		return(0); /* no data */
 	else
@@ -132,11 +157,16 @@ static int usb_kbd_testc(void)
 static int usb_kbd_getc(void)
 {
 	char c;
-	while(usb_in_pointer==usb_out_pointer) {
-#ifdef CONFIG_SYS_USB_EVENT_POLL
-		usb_event_poll();
-#endif
-	}
+
+	struct stdio_dev *dev;
+	struct usb_device *usb_kbd_dev;
+
+	dev = stdio_get_by_name("usbkbd");
+	usb_kbd_dev = (struct usb_device *)dev->priv;
+
+	while(usb_in_pointer==usb_out_pointer)
+		usb_kbd_poll_for_event(usb_kbd_dev);
+
 	if((usb_out_pointer+1)==USB_KBD_BUFFER_LEN)
 		usb_out_pointer=0;
 	else
@@ -308,15 +338,10 @@ static int usb_kbd_translate(unsigned char scancode,unsigned char modifier,int p
 }
 
 /* Interrupt service routine */
-static int usb_kbd_irq(struct usb_device *dev)
+static int usb_kbd_irq_worker(struct usb_device *dev)
 {
 	int i,res;
 
-	if((dev->irq_status!=0)||(dev->irq_act_len!=8))
-	{
-		USB_KBD_PRINTF("usb_keyboard Error %lX, len %d\n",dev->irq_status,dev->irq_act_len);
-		return 1;
-	}
 	res=0;
 
 	switch (new[0]) {
@@ -345,6 +370,17 @@ static int usb_kbd_irq(struct usb_device *dev)
 	return 1; /* install IRQ Handler again */
 }
 
+static int usb_kbd_irq(struct usb_device *dev)
+{
+	if ((dev->irq_status != 0) || (dev->irq_act_len != 8))
+	{
+		USB_KBD_PRINTF("usb_keyboard Error %lX, len %d\n",dev->irq_status,dev->irq_act_len);
+		return 1;
+	}
+
+	return usb_kbd_irq_worker(dev);
+}
+
 /* probes the USB device dev for keyboard type */
 static int usb_kbd_probe(struct usb_device *dev, unsigned int ifnum)
 {