424 lines
10 KiB
C
424 lines
10 KiB
C
/*
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* USB keyboard driver for barebox
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*
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* (C) Copyright 2001 Denis Peter, MPL AG Switzerland
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* (C) Copyright 2015 Peter Mamonov
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <common.h>
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#include <init.h>
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#include <clock.h>
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#include <poller.h>
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#include <usb/usb.h>
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#include <string.h>
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#include <dma.h>
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#include <kfifo.h>
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#define USB_KBD_FIFO_SIZE 50
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#define REPEAT_RATE 40 /* 40msec -> 25cps */
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#define REPEAT_DELAY 10 /* 10 x REPEAT_RATE = 400msec */
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#define NUM_LOCK 0x53
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#define CAPS_LOCK 0x39
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#define SCROLL_LOCK 0x47
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/* Modifier bits */
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#define LEFT_CNTR (1 << 0)
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#define LEFT_SHIFT (1 << 1)
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#define LEFT_ALT (1 << 2)
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#define LEFT_GUI (1 << 3)
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#define RIGHT_CNTR (1 << 4)
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#define RIGHT_SHIFT (1 << 5)
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#define RIGHT_ALT (1 << 6)
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#define RIGHT_GUI (1 << 7)
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/* Size of the keyboard buffer */
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#define USB_KBD_BUFFER_LEN 0x20
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/* Keyboard maps */
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static const unsigned char usb_kbd_numkey[] = {
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'1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
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'\r', 0x1b, '\b', '\t', ' ', '-', '=', '[', ']',
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'\\', '#', ';', '\'', '`', ',', '.', '/'
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};
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static const unsigned char usb_kbd_numkey_shifted[] = {
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'!', '@', '#', '$', '%', '^', '&', '*', '(', ')',
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'\r', 0x1b, '\b', '\t', ' ', '_', '+', '{', '}',
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'|', '~', ':', '"', '~', '<', '>', '?'
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};
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static const unsigned char usb_kbd_num_keypad[] = {
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'/', '*', '-', '+', '\r',
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'1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
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'.', 0, 0, 0, '='
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};
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/*
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* map arrow keys to ^F/^B ^N/^P, can't really use the proper
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* ANSI sequence for arrow keys because the queuing code breaks
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* when a single keypress expands to 3 queue elements
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*/
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static const unsigned char usb_kbd_arrow[] = {
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0x6, 0x2, 0xe, 0x10
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};
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/*
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* NOTE: It's important for the NUM, CAPS, SCROLL-lock bits to be in this
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* order. See usb_kbd_setled() function!
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*/
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#define USB_KBD_NUMLOCK (1 << 0)
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#define USB_KBD_CAPSLOCK (1 << 1)
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#define USB_KBD_SCROLLLOCK (1 << 2)
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#define USB_KBD_CTRL (1 << 3)
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#define USB_KBD_LEDMASK \
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(USB_KBD_NUMLOCK | USB_KBD_CAPSLOCK | USB_KBD_SCROLLLOCK)
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/*
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* USB Keyboard reports are 8 bytes in boot protocol.
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* Appendix B of HID Device Class Definition 1.11
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*/
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#define USB_KBD_BOOT_REPORT_SIZE 8
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struct usb_kbd_pdata;
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struct usb_kbd_pdata {
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uint64_t last_report;
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uint64_t last_poll;
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uint8_t *new;
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uint8_t old[USB_KBD_BOOT_REPORT_SIZE];
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uint32_t repeat_delay;
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uint8_t flags;
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struct poller_struct poller;
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struct usb_device *usbdev;
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struct console_device cdev;
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struct kfifo *recv_fifo;
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int lock;
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unsigned long intpipe;
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int intpktsize;
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int intinterval;
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struct usb_endpoint_descriptor *ep;
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int (*do_poll)(struct usb_kbd_pdata *);
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};
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static int usb_kbd_int_poll(struct usb_kbd_pdata *data)
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{
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return usb_submit_int_msg(data->usbdev, data->intpipe, data->new,
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data->intpktsize, data->intinterval);
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}
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static int usb_kbd_cnt_poll(struct usb_kbd_pdata *data)
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{
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struct usb_interface *iface = &data->usbdev->config.interface[0];
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return usb_get_report(data->usbdev, iface->desc.bInterfaceNumber,
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1, 0, data->new, USB_KBD_BOOT_REPORT_SIZE);
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}
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#define CAPITAL_MASK 0x20
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/* Translate the scancode in ASCII */
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static int usb_kbd_translate(struct usb_kbd_pdata *data, unsigned char scancode,
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unsigned char modifier, int pressed)
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{
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int keycode = 0;
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/* Key released */
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if (pressed == 0) {
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data->repeat_delay = 0;
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return 0;
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}
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if (pressed == 2) {
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data->repeat_delay++;
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if (data->repeat_delay < REPEAT_DELAY)
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return 0;
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data->repeat_delay = REPEAT_DELAY;
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}
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/* Alphanumeric values */
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if ((scancode > 3) && (scancode <= 0x1d)) {
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keycode = scancode - 4 + 'a';
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if (data->flags & USB_KBD_CAPSLOCK)
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keycode &= ~CAPITAL_MASK;
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if (modifier & (LEFT_SHIFT | RIGHT_SHIFT)) {
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/* Handle CAPSLock + Shift pressed simultaneously */
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if (keycode & CAPITAL_MASK)
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keycode &= ~CAPITAL_MASK;
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else
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keycode |= CAPITAL_MASK;
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}
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}
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if ((scancode > 0x1d) && (scancode < 0x3a)) {
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/* Shift pressed */
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if (modifier & (LEFT_SHIFT | RIGHT_SHIFT))
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keycode = usb_kbd_numkey_shifted[scancode - 0x1e];
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else
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keycode = usb_kbd_numkey[scancode - 0x1e];
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}
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/* Arrow keys */
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if ((scancode >= 0x4f) && (scancode <= 0x52))
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keycode = usb_kbd_arrow[scancode - 0x4f];
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/* Numeric keypad */
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if ((scancode >= 0x54) && (scancode <= 0x67))
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keycode = usb_kbd_num_keypad[scancode - 0x54];
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if (data->flags & USB_KBD_CTRL)
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keycode = scancode - 0x3;
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if (pressed == 1) {
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if (scancode == NUM_LOCK) {
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data->flags ^= USB_KBD_NUMLOCK;
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return 1;
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}
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if (scancode == CAPS_LOCK) {
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data->flags ^= USB_KBD_CAPSLOCK;
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return 1;
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}
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if (scancode == SCROLL_LOCK) {
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data->flags ^= USB_KBD_SCROLLLOCK;
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return 1;
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}
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}
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/* Report keycode if any */
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if (keycode) {
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pr_debug("%s: key pressed: '%c'\n", __FUNCTION__, keycode);
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kfifo_put(data->recv_fifo, (u_char*)&keycode, sizeof(keycode));
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}
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return 0;
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}
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static uint32_t usb_kbd_service_key(struct usb_kbd_pdata *data, int i, int up)
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{
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uint32_t res = 0;
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uint8_t *new;
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uint8_t *old;
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if (up) {
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new = data->old;
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old = data->new;
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} else {
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new = data->new;
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old = data->old;
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}
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if ((old[i] > 3) &&
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(memscan(new + 2, old[i], USB_KBD_BOOT_REPORT_SIZE - 2) ==
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new + USB_KBD_BOOT_REPORT_SIZE)) {
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res |= usb_kbd_translate(data, old[i], data->new[0], up);
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}
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return res;
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}
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static void usb_kbd_setled(struct usb_kbd_pdata *data)
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{
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struct usb_device *usbdev = data->usbdev;
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struct usb_interface *iface = &usbdev->config.interface[0];
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uint8_t leds = (uint8_t)(data->flags & USB_KBD_LEDMASK);
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usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0),
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USB_REQ_SET_REPORT, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
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0x200, iface->desc.bInterfaceNumber, &leds, 1, USB_CNTL_TIMEOUT);
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}
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static int usb_kbd_process(struct usb_kbd_pdata *data)
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{
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int i, res = 0;
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/* No combo key pressed */
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if (data->new[0] == 0x00)
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data->flags &= ~USB_KBD_CTRL;
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/* Left or Right Ctrl pressed */
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else if ((data->new[0] == LEFT_CNTR) || (data->new[0] == RIGHT_CNTR))
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data->flags |= USB_KBD_CTRL;
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for (i = 2; i < USB_KBD_BOOT_REPORT_SIZE; i++) {
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res |= usb_kbd_service_key(data, i, 0);
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res |= usb_kbd_service_key(data, i, 1);
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}
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/* Key is still pressed */
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if ((data->new[2] > 3) && (data->old[2] == data->new[2]))
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res |= usb_kbd_translate(data, data->new[2], data->new[0], 2);
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if (res == 1)
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usb_kbd_setled(data);
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return 1;
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}
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static void usb_kbd_poll(struct poller_struct *poller)
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{
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struct usb_kbd_pdata *data = container_of(poller,
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struct usb_kbd_pdata, poller);
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struct usb_device *usbdev = data->usbdev;
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int diff, tout, ret;
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if (data->lock)
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return;
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data->lock = 1;
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if (!is_timeout_non_interruptible(data->last_poll, REPEAT_RATE * MSECOND / 2))
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goto exit;
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data->last_poll = get_time_ns();
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ret = data->do_poll(data);
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if (ret == -EAGAIN)
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goto exit;
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if (ret < 0) {
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/* exit and lock forever */
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dev_err(&usbdev->dev,
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"usb_submit_int_msg() failed. Keyboard disconnect?\n");
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return;
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}
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diff = memcmp(data->old, data->new, USB_KBD_BOOT_REPORT_SIZE);
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tout = get_time_ns() > data->last_report + REPEAT_RATE * MSECOND;
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if (diff || tout) {
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data->last_report = get_time_ns();
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if (diff) {
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pr_debug("%s: old report: %016llx\n",
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__func__,
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*((volatile uint64_t *)data->old));
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pr_debug("%s: new report: %016llx\n\n",
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__func__,
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*((volatile uint64_t *)data->new));
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}
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usb_kbd_process(data);
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memcpy(data->old, data->new, USB_KBD_BOOT_REPORT_SIZE);
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}
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exit:
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data->lock = 0;
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}
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static int usb_kbd_getc(struct console_device *cdev)
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{
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int code = 0;
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struct usb_kbd_pdata *data = container_of(cdev, struct usb_kbd_pdata, cdev);
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kfifo_get(data->recv_fifo, (u_char*)&code, sizeof(int));
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return code;
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}
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static int usb_kbd_tstc(struct console_device *cdev)
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{
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struct usb_kbd_pdata *data = container_of(cdev, struct usb_kbd_pdata, cdev);
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return (kfifo_len(data->recv_fifo) == 0) ? 0 : 1;
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}
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static int usb_kbd_probe(struct usb_device *usbdev,
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const struct usb_device_id *id)
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{
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int ret;
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struct usb_interface *iface = &usbdev->config.interface[0];
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struct usb_kbd_pdata *data;
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struct console_device *cdev;
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dev_info(&usbdev->dev, "USB keyboard found\n");
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dev_dbg(&usbdev->dev, "Debug enabled\n");
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ret = usb_set_protocol(usbdev, iface->desc.bInterfaceNumber, 0);
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if (ret < 0)
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return ret;
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ret = usb_set_idle(usbdev, iface->desc.bInterfaceNumber, 1, 0);
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if (ret < 0)
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return ret;
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data = xzalloc(sizeof(struct usb_kbd_pdata));
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usbdev->drv_data = data;
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data->recv_fifo = kfifo_alloc(USB_KBD_FIFO_SIZE);
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data->new = dma_alloc(USB_KBD_BOOT_REPORT_SIZE);
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data->usbdev = usbdev;
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data->last_report = get_time_ns();
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data->ep = &iface->ep_desc[0];
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data->intpipe = usb_rcvintpipe(usbdev, data->ep->bEndpointAddress);
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data->intpktsize = min(usb_maxpacket(usbdev, data->intpipe),
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USB_KBD_BOOT_REPORT_SIZE);
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data->intinterval = data->ep->bInterval;
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/* test polling via interrupt endpoint */
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data->do_poll = usb_kbd_int_poll;
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ret = data->do_poll(data);
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if (ret < 0) {
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/* fall back to polling via control enpoint */
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data->do_poll = usb_kbd_cnt_poll;
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usb_set_idle(usbdev,
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iface->desc.bInterfaceNumber, 0, 0);
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ret = data->do_poll(data);
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if (ret < 0) {
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/* no luck */
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kfifo_free(data->recv_fifo);
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dma_free(data->new);
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free(data);
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return ret;
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} else
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dev_dbg(&usbdev->dev, "poll keyboard via cont ep\n");
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} else
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dev_dbg(&usbdev->dev, "poll keyboard via int ep\n");
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cdev = &data->cdev;
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usbdev->dev.type_data = cdev;
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cdev->dev = &usbdev->dev;
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cdev->tstc = usb_kbd_tstc;
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cdev->getc = usb_kbd_getc;
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console_register(cdev);
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console_set_active(cdev, CONSOLE_STDIN);
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data->poller.func = usb_kbd_poll;
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return poller_register(&data->poller);
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}
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static void usb_kbd_disconnect(struct usb_device *usbdev)
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{
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struct usb_kbd_pdata *data = usbdev->drv_data;
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poller_unregister(&data->poller);
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console_unregister(&data->cdev);
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kfifo_free(data->recv_fifo);
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dma_free(data->new);
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free(data);
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}
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static struct usb_device_id usb_kbd_usb_ids[] = {
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{ USB_INTERFACE_INFO(3, 1, 1) }, // usb keyboard
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{ }
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};
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static struct usb_driver usb_kbd_driver = {
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.name = "usb-keyboard",
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.id_table = usb_kbd_usb_ids,
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.probe = usb_kbd_probe,
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.disconnect = usb_kbd_disconnect,
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};
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static int __init usb_kbd_init(void)
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{
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return usb_driver_register(&usb_kbd_driver);
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}
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device_initcall(usb_kbd_init);
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