1 files changed, 325 insertions, 262 deletions

diff --git a/common/usb_kbd.c b/common/usb_kbd.c
index ef440e4..2d78831 100644
--- a/common/usb_kbd.c
+++ b/common/usb_kbd.c
@@ -25,12 +25,18 @@
  *
  */
 #include <common.h>
+#include <malloc.h>
 #include <stdio_dev.h>
 #include <asm/byteorder.h>
 
 #include <usb.h>
 
-#undef USB_KBD_DEBUG
+#ifdef	USB_KBD_DEBUG
+#define USB_KBD_PRINTF(fmt, args...)	printf(fmt, ##args)
+#else
+#define USB_KBD_PRINTF(fmt, args...)
+#endif
+
 /*
  * If overwrite_console returns 1, the stdin, stderr and stdout
  * are switched to the serial port, else the settings in the
@@ -45,352 +51,257 @@ int overwrite_console(void)
 }
 #endif
 
-#ifdef USB_KBD_DEBUG
-#define USB_KBD_PRINTF(fmt, args...)	printf(fmt, ##args)
-#else
-#define USB_KBD_PRINTF(fmt, args...)
-#endif
-
-
-#define REPEAT_RATE	(40/4)	/* 40msec -> 25cps */
-#define REPEAT_DELAY	10	/* 10 x REPEAT_RATE = 400msec */
+/* Keyboard sampling rate */
+#define REPEAT_RATE	(40 / 4)	/* 40msec -> 25cps */
+#define REPEAT_DELAY	10		/* 10 x REPEAT_RATE = 400msec */
 
 #define NUM_LOCK	0x53
 #define CAPS_LOCK	0x39
 #define SCROLL_LOCK	0x47
 
-
 /* Modifier bits */
-#define LEFT_CNTR		0
-#define LEFT_SHIFT		1
-#define LEFT_ALT		2
-#define LEFT_GUI		3
-#define RIGHT_CNTR		4
-#define RIGHT_SHIFT		5
-#define RIGHT_ALT		6
-#define RIGHT_GUI		7
-
-#define USB_KBD_BUFFER_LEN	0x20	/* size of the keyboardbuffer */
-
-static char usb_kbd_buffer[USB_KBD_BUFFER_LEN];
-static int usb_in_pointer;
-static int usb_out_pointer;
-
-unsigned char new[8];
-unsigned char old[8];
-int repeat_delay;
+#define LEFT_CNTR	(1 << 0)
+#define LEFT_SHIFT	(1 << 1)
+#define LEFT_ALT	(1 << 2)
+#define LEFT_GUI	(1 << 3)
+#define RIGHT_CNTR	(1 << 4)
+#define RIGHT_SHIFT	(1 << 5)
+#define RIGHT_ALT	(1 << 6)
+#define RIGHT_GUI	(1 << 7)
+
+/* Size of the keyboard buffer */
+#define USB_KBD_BUFFER_LEN	0x20
+
+/* Device name */
 #define DEVNAME			"usbkbd"
-static unsigned char num_lock;
-static unsigned char caps_lock;
-static unsigned char scroll_lock;
-static unsigned char ctrl;
-
-static unsigned char leds __attribute__((aligned(0x4)));
 
-static unsigned char usb_kbd_numkey[] = {
+/* Keyboard maps */
+static const unsigned char usb_kbd_numkey[] = {
 	'1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
 	'\r', 0x1b, '\b', '\t', ' ', '-', '=', '[', ']',
 	'\\', '#', ';', '\'', '`', ',', '.', '/'
 };
-static unsigned char usb_kbd_numkey_shifted[] = {
+static const unsigned char usb_kbd_numkey_shifted[] = {
 	'!', '@', '#', '$', '%', '^', '&', '*', '(', ')',
 	'\r', 0x1b, '\b', '\t', ' ', '_', '+', '{', '}',
 	'|', '~', ':', '"', '~', '<', '>', '?'
 };
 
-static int usb_kbd_irq_worker(struct usb_device *dev);
+/*
+ * NOTE: It's important for the NUM, CAPS, SCROLL-lock bits to be in this
+ *       order. See usb_kbd_setled() function!
+ */
+#define USB_KBD_NUMLOCK		(1 << 0)
+#define USB_KBD_CAPSLOCK	(1 << 1)
+#define USB_KBD_SCROLLLOCK	(1 << 2)
+#define USB_KBD_CTRL		(1 << 3)
 
-/******************************************************************
- * 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
-}
+#define USB_KBD_LEDMASK		\
+	(USB_KBD_NUMLOCK | USB_KBD_CAPSLOCK | USB_KBD_SCROLLLOCK)
 
-/******************************************************************
- * Queue handling
- ******************************************************************/
-/* puts character in the queue and sets up the in and out pointer */
-static void usb_kbd_put_queue(char data)
-{
-	if ((usb_in_pointer+1) == USB_KBD_BUFFER_LEN) {
-		if (usb_out_pointer == 0)
-			return; /* buffer full */
-		else
-			usb_in_pointer = 0;
-	} else {
-		if ((usb_in_pointer+1) == usb_out_pointer)
-			return; /* buffer full */
-		usb_in_pointer++;
-	}
-	usb_kbd_buffer[usb_in_pointer] = data;
-	return;
-}
+struct usb_kbd_pdata {
+	uint32_t	repeat_delay;
 
-/* test if a character is in the queue */
-static int usb_kbd_testc(void)
-{
-	struct stdio_dev *dev;
-	struct usb_device *usb_kbd_dev;
+	uint32_t	usb_in_pointer;
+	uint32_t	usb_out_pointer;
+	uint8_t		usb_kbd_buffer[USB_KBD_BUFFER_LEN];
 
-	dev = stdio_get_by_name("usbkbd");
-	usb_kbd_dev = (struct usb_device *)dev->priv;
+	uint8_t		new[8];
+	uint8_t		old[8];
 
-	usb_kbd_poll_for_event(usb_kbd_dev);
+	uint8_t		flags;
+};
 
-	if (usb_in_pointer == usb_out_pointer)
-		return 0; /* no data */
-	else
-		return 1;
-}
-/* gets the character from the queue */
-static int usb_kbd_getc(void)
+/* Generic keyboard event polling. */
+void usb_kbd_generic_poll(void)
 {
-	char c;
-
 	struct stdio_dev *dev;
 	struct usb_device *usb_kbd_dev;
+	struct usb_kbd_pdata *data;
+	struct usb_interface *iface;
+	struct usb_endpoint_descriptor *ep;
+	int pipe;
+	int maxp;
 
-	dev = stdio_get_by_name("usbkbd");
+	/* Get the pointer to USB Keyboard device pointer */
+	dev = stdio_get_by_name(DEVNAME);
 	usb_kbd_dev = (struct usb_device *)dev->priv;
+	data = usb_kbd_dev->privptr;
+	iface = &usb_kbd_dev->config.if_desc[0];
+	ep = &iface->ep_desc[0];
+	pipe = usb_rcvintpipe(usb_kbd_dev, ep->bEndpointAddress);
 
-	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
-		usb_out_pointer++;
-	c = usb_kbd_buffer[usb_out_pointer];
-	return (int)c;
-
+	/* Submit a interrupt transfer request */
+	maxp = usb_maxpacket(usb_kbd_dev, pipe);
+	usb_submit_int_msg(usb_kbd_dev, pipe, data->new,
+			maxp > 8 ? 8 : maxp, ep->bInterval);
 }
 
-/* forward decleration */
-static int usb_kbd_probe(struct usb_device *dev, unsigned int ifnum);
-
-/* search for keyboard and register it if found */
-int drv_usb_kbd_init(void)
+/* Puts character in the queue and sets up the in and out pointer. */
+static void usb_kbd_put_queue(struct usb_kbd_pdata *data, char c)
 {
-	int error, i;
-	struct stdio_dev usb_kbd_dev, *old_dev;
-	struct usb_device *dev;
-	char *stdinname = getenv("stdin");
+	if (data->usb_in_pointer == USB_KBD_BUFFER_LEN - 1) {
+		/* Check for buffer full. */
+		if (data->usb_out_pointer == 0)
+			return;
 
-	usb_in_pointer = 0;
-	usb_out_pointer = 0;
-	/* scan all USB Devices */
-	for (i = 0 ; i < USB_MAX_DEVICE ; i++) {
-		dev = usb_get_dev_index(i); /* get device */
-		if (dev == NULL)
-			return -1;
-		if (dev->devnum != -1) {
-			/* Ok, we found a keyboard */
-			if (usb_kbd_probe(dev, 0) == 1) {
-				/* check, if it is already registered */
-				USB_KBD_PRINTF("USB KBD found set up "
-						"device.\n");
-				old_dev = stdio_get_by_name(DEVNAME);
-				if (old_dev) {
-					/* already registered, just return ok */
-					USB_KBD_PRINTF("USB KBD is already "
-							"registered.\n");
-					return 1;
-				}
-				/* register the keyboard */
-				USB_KBD_PRINTF("USB KBD register.\n");
-				memset(&usb_kbd_dev, 0,
-						sizeof(struct stdio_dev));
-				strcpy(usb_kbd_dev.name, DEVNAME);
-				usb_kbd_dev.flags =  DEV_FLAGS_INPUT |
-							DEV_FLAGS_SYSTEM;
-				usb_kbd_dev.putc = NULL;
-				usb_kbd_dev.puts = NULL;
-				usb_kbd_dev.getc = usb_kbd_getc;
-				usb_kbd_dev.tstc = usb_kbd_testc;
-				usb_kbd_dev.priv = (void *)dev;
-				error = stdio_register(&usb_kbd_dev);
-				if (error == 0) {
-					/*
-					 * check if this is the standard
-					 * input device
-					 */
-					if (strcmp(stdinname, DEVNAME) == 0) {
-						/* reassign the console */
-						if (overwrite_console())
-							return 1;
-						error = console_assign(stdin,
-								DEVNAME);
-						if (error == 0)
-							return 1;
-						else
-							return error;
-					}
-					return 1;
-				}
-				return error;
-			}
-		}
-	}
-	/* no USB Keyboard found */
-	return -1;
-}
+		data->usb_in_pointer = 0;
+	} else {
+		/* Check for buffer full. */
+		if (data->usb_in_pointer == data->usb_out_pointer - 1)
+			return;
 
+		data->usb_in_pointer++;
+	}
 
-/* deregistering the keyboard */
-int usb_kbd_deregister(void)
-{
-#ifdef CONFIG_SYS_STDIO_DEREGISTER
-	return stdio_deregister(DEVNAME);
-#else
-	return 1;
-#endif
+	data->usb_kbd_buffer[data->usb_in_pointer] = c;
 }
 
-/**************************************************************************
- * Low Level drivers
+/*
+ * Set the LEDs. Since this is used in the irq routine, the control job is
+ * issued with a timeout of 0. This means, that the job is queued without
+ * waiting for job completion.
  */
-
-/* set the LEDs. Since this is used in the irq routine, the control job
-   is issued with a timeout of 0. This means, that the job is queued without
-   waiting for job completion */
-
 static void usb_kbd_setled(struct usb_device *dev)
 {
-	struct usb_interface *iface;
-	iface = &dev->config.if_desc[0];
-	leds = 0;
-	if (scroll_lock != 0)
-		leds |= 1;
-	leds <<= 1;
-	if (caps_lock != 0)
-		leds |= 1;
-	leds <<= 1;
-	if (num_lock != 0)
-		leds |= 1;
+	struct usb_interface *iface = &dev->config.if_desc[0];
+	struct usb_kbd_pdata *data = dev->privptr;
+	uint32_t leds = data->flags & USB_KBD_LEDMASK;
+
 	usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 		USB_REQ_SET_REPORT, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 		0x200, iface->desc.bInterfaceNumber, (void *)&leds, 1, 0);
-
 }
 
-
-#define CAPITAL_MASK 0x20
+#define CAPITAL_MASK	0x20
 /* Translate the scancode in ASCII */
-static int usb_kbd_translate(unsigned char scancode, unsigned char modifier,
-				int pressed)
+static int usb_kbd_translate(struct usb_kbd_pdata *data, unsigned char scancode,
+				unsigned char modifier, int pressed)
 {
-	unsigned char keycode;
+	uint8_t keycode = 0;
 
+	/* Key released */
 	if (pressed == 0) {
-		/* key released */
-		repeat_delay = 0;
+		data->repeat_delay = 0;
 		return 0;
 	}
+
 	if (pressed == 2) {
-		repeat_delay++;
-		if (repeat_delay < REPEAT_DELAY)
+		data->repeat_delay++;
+		if (data->repeat_delay < REPEAT_DELAY)
 			return 0;
-		repeat_delay = REPEAT_DELAY;
+
+		data->repeat_delay = REPEAT_DELAY;
 	}
-	keycode = 0;
-	if ((scancode > 3) && (scancode <= 0x1d)) { /* alpha numeric values */
-		keycode = scancode - 4 + 0x61;
-		if (caps_lock)
-			/* switch to capital Letters */
+
+	/* Alphanumeric values */
+	if ((scancode > 3) && (scancode <= 0x1d)) {
+		keycode = scancode - 4 + 'a';
+
+		if (data->flags & USB_KBD_CAPSLOCK)
 			keycode &= ~CAPITAL_MASK;
-		if (((modifier&(1 << LEFT_SHIFT)) != 0) ||
-			((modifier&(1 << RIGHT_SHIFT)) != 0)) {
+
+		if (modifier & (LEFT_SHIFT | RIGHT_SHIFT)) {
+			/* Handle CAPSLock + Shift pressed simultaneously */
 			if (keycode & CAPITAL_MASK)
-				/* switch to capital Letters */
 				keycode &= ~CAPITAL_MASK;
 			else
-				/* switch to non capital Letters */
 				keycode |= CAPITAL_MASK;
 		}
 	}
-	if ((scancode > 0x1d) && (scancode < 0x3A)) {
-		if (((modifier&(1 << LEFT_SHIFT)) != 0) ||
-			((modifier&(1 << RIGHT_SHIFT)) != 0))  /* shifted */
-			keycode = usb_kbd_numkey_shifted[scancode-0x1e];
-		else /* non shifted */
-			keycode = usb_kbd_numkey[scancode-0x1e];
+
+	if ((scancode > 0x1d) && (scancode < 0x3a)) {
+		/* Shift pressed */
+		if (modifier & (LEFT_SHIFT | RIGHT_SHIFT))
+			keycode = usb_kbd_numkey_shifted[scancode - 0x1e];
+		else
+			keycode = usb_kbd_numkey[scancode - 0x1e];
 	}
 
-	if (ctrl)
+	if (data->flags & USB_KBD_CTRL)
 		keycode = scancode - 0x3;
 
 	if (pressed == 1) {
 		if (scancode == NUM_LOCK) {
-			num_lock = ~num_lock;
+			data->flags ^= USB_KBD_NUMLOCK;
 			return 1;
 		}
+
 		if (scancode == CAPS_LOCK) {
-			caps_lock = ~caps_lock;
+			data->flags ^= USB_KBD_CAPSLOCK;
 			return 1;
 		}
 		if (scancode == SCROLL_LOCK) {
-			scroll_lock = ~scroll_lock;
+			data->flags ^= USB_KBD_SCROLLLOCK;
 			return 1;
 		}
 	}
-	if (keycode != 0) {
+
+	/* Report keycode if any */
+	if (keycode) {
 		USB_KBD_PRINTF("%c", keycode);
-		usb_kbd_put_queue(keycode);
+		usb_kbd_put_queue(data, keycode);
 	}
+
 	return 0;
 }
 
+static uint32_t usb_kbd_service_key(struct usb_device *dev, int i, int up)
+{
+	uint32_t res = 0;
+	struct usb_kbd_pdata *data = dev->privptr;
+	uint8_t *new;
+	uint8_t *old;
+
+	if (up) {
+		new = data->old;
+		old = data->new;
+	} else {
+		new = data->new;
+		old = data->old;
+	}
+
+	if ((old[i] > 3) && (memscan(new + 2, old[i], 6) == new + 8))
+		res |= usb_kbd_translate(data, old[i], data->new[0], up);
+
+	return res;
+}
+
 /* Interrupt service routine */
 static int usb_kbd_irq_worker(struct usb_device *dev)
 {
-	int i, res;
+	struct usb_kbd_pdata *data = dev->privptr;
+	int i, res = 0;
 
-	res = 0;
-
-	switch (new[0]) {
-	case 0x0:	/* No combo key pressed */
-		ctrl = 0;
-		break;
-	case 0x01:	/* Left Ctrl pressed */
-	case 0x10:	/* Right Ctrl pressed */
-		ctrl = 1;
-		break;
-	}
+	/* No combo key pressed */
+	if (data->new[0] == 0x00)
+		data->flags &= ~USB_KBD_CTRL;
+	/* Left or Right Ctrl pressed */
+	else if ((data->new[0] == LEFT_CNTR) || (data->new[0] == RIGHT_CNTR))
+		data->flags |= USB_KBD_CTRL;
 
 	for (i = 2; i < 8; i++) {
-		if (old[i] > 3 && memscan(&new[2], old[i], 6) == &new[8])
-			res |= usb_kbd_translate(old[i], new[0], 0);
-
-		if (new[i] > 3 && memscan(&old[2], new[i], 6) == &old[8])
-			res |= usb_kbd_translate(new[i], new[0], 1);
+		res |= usb_kbd_service_key(dev, i, 0);
+		res |= usb_kbd_service_key(dev, i, 1);
 	}
 
-	if ((new[2] > 3) && (old[2] == new[2])) /* still pressed */
-		res |= usb_kbd_translate(new[2], new[0], 2);
+	/* Key is still pressed */
+	if ((data->new[2] > 3) && (data->old[2] == data->new[2]))
+		res |= usb_kbd_translate(data, data->new[2], data->new[0], 2);
+
 	if (res == 1)
 		usb_kbd_setled(dev);
 
-	memcpy(&old[0], &new[0], 8);
+	memcpy(data->old, data->new, 8);
 
-	return 1; /* install IRQ Handler again */
+	return 1;
 }
 
+/* Keyboard interrupt handler */
 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",
+		USB_KBD_PRINTF("USB KBD: Error %lX, len %d\n",
 				dev->irq_status, dev->irq_act_len);
 		return 1;
 	}
@@ -398,50 +309,202 @@ static int usb_kbd_irq(struct usb_device *dev)
 	return usb_kbd_irq_worker(dev);
 }
 
-/* probes the USB device dev for keyboard type */
+/* 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;
+	struct usb_kbd_pdata *data = dev->privptr;
+	iface = &dev->config.if_desc[0];
+	usb_get_report(dev, iface->desc.bInterfaceNumber,
+			1, 1, data->new, sizeof(data->new));
+	if (memcmp(data->old, data->new, sizeof(data->new)))
+		usb_kbd_irq_worker(dev);
+#endif
+}
+
+/* test if a character is in the queue */
+static int usb_kbd_testc(void)
+{
+	struct stdio_dev *dev;
+	struct usb_device *usb_kbd_dev;
+	struct usb_kbd_pdata *data;
+
+	dev = stdio_get_by_name(DEVNAME);
+	usb_kbd_dev = (struct usb_device *)dev->priv;
+	data = usb_kbd_dev->privptr;
+
+	usb_kbd_poll_for_event(usb_kbd_dev);
+
+	return !(data->usb_in_pointer == data->usb_out_pointer);
+}
+
+/* gets the character from the queue */
+static int usb_kbd_getc(void)
+{
+	struct stdio_dev *dev;
+	struct usb_device *usb_kbd_dev;
+	struct usb_kbd_pdata *data;
+
+	dev = stdio_get_by_name(DEVNAME);
+	usb_kbd_dev = (struct usb_device *)dev->priv;
+	data = usb_kbd_dev->privptr;
+
+	while (data->usb_in_pointer == data->usb_out_pointer)
+		usb_kbd_poll_for_event(usb_kbd_dev);
+
+	if (data->usb_out_pointer == USB_KBD_BUFFER_LEN - 1)
+		data->usb_out_pointer = 0;
+	else
+		data->usb_out_pointer++;
+
+	return data->usb_kbd_buffer[data->usb_out_pointer];
+}
+
+/* probes the USB device dev for keyboard type. */
 static int usb_kbd_probe(struct usb_device *dev, unsigned int ifnum)
 {
 	struct usb_interface *iface;
 	struct usb_endpoint_descriptor *ep;
+	struct usb_kbd_pdata *data;
 	int pipe, maxp;
 
 	if (dev->descriptor.bNumConfigurations != 1)
 		return 0;
+
 	iface = &dev->config.if_desc[ifnum];
 
 	if (iface->desc.bInterfaceClass != 3)
 		return 0;
+
 	if (iface->desc.bInterfaceSubClass != 1)
 		return 0;
+
 	if (iface->desc.bInterfaceProtocol != 1)
 		return 0;
+
 	if (iface->desc.bNumEndpoints != 1)
 		return 0;
 
 	ep = &iface->ep_desc[0];
 
+	/* Check if endpoint 1 is interrupt endpoint */
 	if (!(ep->bEndpointAddress & 0x80))
 		return 0;
+
 	if ((ep->bmAttributes & 3) != 3)
 		return 0;
-	USB_KBD_PRINTF("USB KBD found set protocol...\n");
-	/* ok, we found a USB Keyboard, install it */
-	/* usb_kbd_get_hid_desc(dev); */
-	usb_set_protocol(dev, iface->desc.bInterfaceNumber, 0);
-	USB_KBD_PRINTF("USB KBD found set idle...\n");
-	usb_set_idle(dev, iface->desc.bInterfaceNumber, REPEAT_RATE, 0);
-	memset(&new[0], 0, 8);
-	memset(&old[0], 0, 8);
-	repeat_delay = 0;
+
+	USB_KBD_PRINTF("USB KBD: found set protocol...\n");
+
+	data = malloc(sizeof(struct usb_kbd_pdata));
+	if (!data) {
+		printf("USB KBD: Error allocating private data\n");
+		return 0;
+	}
+
+	/* Clear private data */
+	memset(data, 0, sizeof(struct usb_kbd_pdata));
+
+	/* Insert private data into USB device structure */
+	dev->privptr = data;
+
+	/* Set IRQ handler */
+	dev->irq_handle = usb_kbd_irq;
+
 	pipe = usb_rcvintpipe(dev, ep->bEndpointAddress);
 	maxp = usb_maxpacket(dev, pipe);
-	dev->irq_handle = usb_kbd_irq;
-	USB_KBD_PRINTF("USB KBD enable interrupt pipe...\n");
-	usb_submit_int_msg(dev, pipe, &new[0], maxp > 8 ? 8 : maxp,
+
+	/* We found a USB Keyboard, install it. */
+	usb_set_protocol(dev, iface->desc.bInterfaceNumber, 0);
+
+	USB_KBD_PRINTF("USB KBD: found set idle...\n");
+	usb_set_idle(dev, iface->desc.bInterfaceNumber, REPEAT_RATE, 0);
+
+	USB_KBD_PRINTF("USB KBD: enable interrupt pipe...\n");
+	usb_submit_int_msg(dev, pipe, data->new, maxp > 8 ? 8 : maxp,
 				ep->bInterval);
+
+	/* Success. */
 	return 1;
 }
 
+/* Search for keyboard and register it if found. */
+int drv_usb_kbd_init(void)
+{
+	struct stdio_dev usb_kbd_dev, *old_dev;
+	struct usb_device *dev;
+	char *stdinname = getenv("stdin");
+	int error, i;
+
+	/* Scan all USB Devices */
+	for (i = 0; i < USB_MAX_DEVICE; i++) {
+		/* Get USB device. */
+		dev = usb_get_dev_index(i);
+		if (!dev)
+			return -1;
+
+		if (dev->devnum == -1)
+			continue;
+
+		/* Try probing the keyboard */
+		if (usb_kbd_probe(dev, 0) != 1)
+			continue;
+
+		/* We found a keyboard, check if it is already registered. */
+		USB_KBD_PRINTF("USB KBD: found set up device.\n");
+		old_dev = stdio_get_by_name(DEVNAME);
+		if (old_dev) {
+			/* Already registered, just return ok. */
+			USB_KBD_PRINTF("USB KBD: is already registered.\n");
+			return 1;
+		}
+
+		/* Register the keyboard */
+		USB_KBD_PRINTF("USB KBD: register.\n");
+		memset(&usb_kbd_dev, 0, sizeof(struct stdio_dev));
+		strcpy(usb_kbd_dev.name, DEVNAME);
+		usb_kbd_dev.flags =  DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
+		usb_kbd_dev.putc = NULL;
+		usb_kbd_dev.puts = NULL;
+		usb_kbd_dev.getc = usb_kbd_getc;
+		usb_kbd_dev.tstc = usb_kbd_testc;
+		usb_kbd_dev.priv = (void *)dev;
+		error = stdio_register(&usb_kbd_dev);
+		if (error)
+			return error;
+
+		/* Check if this is the standard input device. */
+		if (strcmp(stdinname, DEVNAME))
+			return 1;
+
+		/* Reassign the console */
+		if (overwrite_console())
+			return 1;
+
+		error = console_assign(stdin, DEVNAME);
+		if (error)
+			return error;
+
+		return 1;
+	}
+
+	/* No USB Keyboard found */
+	return -1;
+}
+
+/* Deregister the keyboard. */
+int usb_kbd_deregister(void)
+{
+#ifdef CONFIG_SYS_STDIO_DEREGISTER
+	return stdio_deregister(DEVNAME);
+#else
+	return 1;
+#endif
+}
 
 #if 0
 struct usb_hid_descriptor {