/*
   * (C) Copyright 2001
   * Denis Peter, MPL AG Switzerland
   *
   * Part of this source has been derived from the Linux USB
   * project.
   *

   * SPDX-License-Identifier:	GPL-2.0+

   */
  #include <common.h>

  #include <malloc.h>

  #include <stdio_dev.h>

  #include <asm/byteorder.h>

  #include <usb.h>

  /*

   * If overwrite_console returns 1, the stdin, stderr and stdout

   * are switched to the serial port, else the settings in the
   * environment are used
   */

  #ifdef CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE

  extern int overwrite_console(void);

  #else

  int overwrite_console(void)

  {

  	return 0;

  }
  #endif

  /* 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	(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"

  /* Keyboard maps */
  static const unsigned char usb_kbd_numkey[] = {

  	'1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
  	'\r', 0x1b, '\b', '\t', ' ', '-', '=', '[', ']',
  	'\\', '#', ';', '\'', '`', ',', '.', '/'

  };

  static const unsigned char usb_kbd_numkey_shifted[] = {

  	'!', '@', '#', '$', '%', '^', '&', '*', '(', ')',
  	'\r', 0x1b, '\b', '\t', ' ', '_', '+', '{', '}',
  	'|', '~', ':', '"', '~', '<', '>', '?'

  };

  static const unsigned char usb_kbd_num_keypad[] = {
  	'/', '*', '-', '+', '\r',
  	'1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
  	'.', 0, 0, 0, '='
  };

  /*

   * map arrow keys to ^F/^B ^N/^P, can't really use the proper
   * ANSI sequence for arrow keys because the queuing code breaks
   * when a single keypress expands to 3 queue elements
   */
  static const unsigned char usb_kbd_arrow[] = {
  	0x6, 0x2, 0xe, 0x10
  };
  
  /*

   * 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)

  #define USB_KBD_LEDMASK		\
  	(USB_KBD_NUMLOCK | USB_KBD_CAPSLOCK | USB_KBD_SCROLLLOCK)

  struct usb_kbd_pdata {
  	uint32_t	repeat_delay;

  	uint32_t	usb_in_pointer;
  	uint32_t	usb_out_pointer;
  	uint8_t		usb_kbd_buffer[USB_KBD_BUFFER_LEN];

  	uint8_t		*new;

  	uint8_t		old[8];

  	uint8_t		flags;
  };

  extern int __maybe_unused net_busy_flag;
  
  /* The period of time between two calls of usb_kbd_testc(). */
  static unsigned long __maybe_unused kbd_testc_tms;

  /* Generic keyboard event polling. */
  void usb_kbd_generic_poll(void)

  {

  	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;

  	/* 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);

  	/* 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);

  }

  /* 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)

  {

  	if (data->usb_in_pointer == USB_KBD_BUFFER_LEN - 1) {
  		/* Check for buffer full. */
  		if (data->usb_out_pointer == 0)
  			return;

  		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++;
  	}

  	data->usb_kbd_buffer[data->usb_in_pointer] = c;

  }

  /*
   * 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 = &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

  /* Translate the scancode in ASCII */

  static int usb_kbd_translate(struct usb_kbd_pdata *data, unsigned char scancode,
  				unsigned char modifier, int pressed)

  {

  	uint8_t keycode = 0;

  	/* Key released */

  	if (pressed == 0) {

  		data->repeat_delay = 0;

  		return 0;
  	}

  	if (pressed == 2) {

  		data->repeat_delay++;
  		if (data->repeat_delay < REPEAT_DELAY)

  			return 0;

  
  		data->repeat_delay = REPEAT_DELAY;

  	}

  
  	/* Alphanumeric values */
  	if ((scancode > 3) && (scancode <= 0x1d)) {
  		keycode = scancode - 4 + 'a';
  
  		if (data->flags & USB_KBD_CAPSLOCK)

  			keycode &= ~CAPITAL_MASK;

  
  		if (modifier & (LEFT_SHIFT | RIGHT_SHIFT)) {
  			/* Handle CAPSLock + Shift pressed simultaneously */

  			if (keycode & CAPITAL_MASK)

  				keycode &= ~CAPITAL_MASK;

  			else

  				keycode |= CAPITAL_MASK;

  		}
  	}

  
  	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];

  	}

  	/* Arrow keys */
  	if ((scancode >= 0x4f) && (scancode <= 0x52))
  		keycode = usb_kbd_arrow[scancode - 0x4f];

  	/* Numeric keypad */
  	if ((scancode >= 0x54) && (scancode <= 0x67))
  		keycode = usb_kbd_num_keypad[scancode - 0x54];

  	if (data->flags & USB_KBD_CTRL)

  		keycode = scancode - 0x3;

  	if (pressed == 1) {
  		if (scancode == NUM_LOCK) {

  			data->flags ^= USB_KBD_NUMLOCK;

  			return 1;
  		}

  		if (scancode == CAPS_LOCK) {

  			data->flags ^= USB_KBD_CAPSLOCK;

  			return 1;
  		}

  		if (scancode == SCROLL_LOCK) {

  			data->flags ^= USB_KBD_SCROLLLOCK;

  			return 1;
  		}
  	}

  
  	/* Report keycode if any */
  	if (keycode) {

  		debug("%c", 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)

  {

  	struct usb_kbd_pdata *data = dev->privptr;
  	int i, res = 0;

  	/* 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++) {
  		res |= usb_kbd_service_key(dev, i, 0);
  		res |= usb_kbd_service_key(dev, i, 1);

  	}

  	/* 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(data->old, data->new, 8);

  	return 1;

  }

  /* Keyboard interrupt handler */

  static int usb_kbd_irq(struct usb_device *dev)
  {
  	if ((dev->irq_status != 0) || (dev->irq_act_len != 8)) {

  		debug("USB KBD: Error %lX, len %d
  ",
  		      dev->irq_status, dev->irq_act_len);

  		return 1;
  	}
  
  	return usb_kbd_irq_worker(dev);
  }

  /* Interrupt polling */
  static inline void usb_kbd_poll_for_event(struct usb_device *dev)
  {
  #if	defined(CONFIG_SYS_USB_EVENT_POLL)

  	struct usb_interface *iface;
  	struct usb_endpoint_descriptor *ep;
  	struct usb_kbd_pdata *data;
  	int pipe;
  	int maxp;
  
  	/* Get the pointer to USB Keyboard device pointer */
  	data = dev->privptr;
  	iface = &dev->config.if_desc[0];
  	ep = &iface->ep_desc[0];
  	pipe = usb_rcvintpipe(dev, ep->bEndpointAddress);
  
  	/* Submit a interrupt transfer request */
  	maxp = usb_maxpacket(dev, pipe);
  	usb_submit_int_msg(dev, pipe, &data->new[0],
  			maxp > 8 ? 8 : maxp, ep->bInterval);

  	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, 0, 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;

  #ifdef CONFIG_CMD_NET
  	/*
  	 * If net_busy_flag is 1, NET transfer is running,
  	 * then we check key-pressed every second (first check may be
  	 * less than 1 second) to improve TFTP booting performance.
  	 */
  	if (net_busy_flag && (get_timer(kbd_testc_tms) < CONFIG_SYS_HZ))
  		return 0;
  	kbd_testc_tms = get_timer(0);
  #endif

  	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;

  	debug("USB KBD: found set protocol...
  ");

  
  	data = malloc(sizeof(struct usb_kbd_pdata));
  	if (!data) {
  		printf("USB KBD: Error allocating private data
  ");
  		return 0;
  	}
  
  	/* Clear private data */
  	memset(data, 0, sizeof(struct usb_kbd_pdata));

  	/* allocate input buffer aligned and sized to USB DMA alignment */
  	data->new = memalign(USB_DMA_MINALIGN, roundup(8, USB_DMA_MINALIGN));

  	/* 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);

  
  	/* We found a USB Keyboard, install it. */
  	usb_set_protocol(dev, iface->desc.bInterfaceNumber, 0);

  	debug("USB KBD: found set idle...
  ");

  	usb_set_idle(dev, iface->desc.bInterfaceNumber, REPEAT_RATE, 0);

  	debug("USB KBD: enable interrupt pipe...
  ");

  	if (usb_submit_int_msg(dev, pipe, data->new, maxp > 8 ? 8 : maxp,
  			       ep->bInterval) < 0) {
  		printf("Failed to get keyboard state from device %04x:%04x
  ",
  		       dev->descriptor.idVendor, dev->descriptor.idProduct);
  		/* Abort, we don't want to use that non-functional keyboard. */
  		return 0;
  	}

  
  	/* 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. */

  		debug("USB KBD: found set up device.
  ");

  		old_dev = stdio_get_by_name(DEVNAME);
  		if (old_dev) {
  			/* Already registered, just return ok. */

  			debug("USB KBD: is already registered.
  ");

  			usb_kbd_deregister();

  			return 1;
  		}
  
  		/* Register the keyboard */

  		debug("USB KBD: register.
  ");

  		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;

  #ifdef CONFIG_CONSOLE_MUX
  		error = iomux_doenv(stdin, stdinname);
  		if (error)
  			return error;
  #else

  		/* 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;

  #endif

  
  		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
  }