// SPDX-License-Identifier: GPL-2.0-or-later/* * SEGA Dreamcast keyboard driver * Based on drivers/usb/usbkbd.c * Copyright (c) YAEGASHI Takeshi, 2001 * Porting to 2.6 Copyright (c) Adrian McMenamin, 2007 - 2009 */ #include <linux/kernel.h>#include <linux/slab.h>#include <linux/input.h>#include <linux/module.h>#include <linux/init.h>#include <linux/timer.h>#include <linux/maple.h> /* Very simple mutex to ensure proper cleanup */static DEFINE_MUTEX(maple_keyb_mutex); #define NR_SCANCODES 256 MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk");MODULE_DESCRIPTION("SEGA Dreamcast keyboard driver");MODULE_LICENSE("GPL"); struct dc_kbd {	struct input_dev *dev;	unsigned short keycode[NR_SCANCODES];	unsigned char new[8];	unsigned char old[8];}; static const unsigned short dc_kbd_keycode[NR_SCANCODES] = {	KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_A, KEY_B,	KEY_C, KEY_D, KEY_E, KEY_F, KEY_G, KEY_H, KEY_I, KEY_J, KEY_K, KEY_L,	KEY_M, KEY_N, KEY_O, KEY_P, KEY_Q, KEY_R, KEY_S, KEY_T, KEY_U, KEY_V,	KEY_W, KEY_X, KEY_Y, KEY_Z, KEY_1, KEY_2, KEY_3, KEY_4, KEY_5, KEY_6,	KEY_7, KEY_8, KEY_9, KEY_0, KEY_ENTER, KEY_ESC, KEY_BACKSPACE,	KEY_TAB, KEY_SPACE, KEY_MINUS, KEY_EQUAL, KEY_LEFTBRACE,	KEY_RIGHTBRACE, KEY_BACKSLASH, KEY_BACKSLASH, KEY_SEMICOLON,	KEY_APOSTROPHE, KEY_GRAVE, KEY_COMMA, KEY_DOT, KEY_SLASH,	KEY_CAPSLOCK, KEY_F1, KEY_F2, KEY_F3, KEY_F4, KEY_F5, KEY_F6,	KEY_F7, KEY_F8, KEY_F9, KEY_F10, KEY_F11, KEY_F12, KEY_SYSRQ,	KEY_SCROLLLOCK, KEY_PAUSE, KEY_INSERT, KEY_HOME, KEY_PAGEUP,	KEY_DELETE, KEY_END, KEY_PAGEDOWN, KEY_RIGHT, KEY_LEFT, KEY_DOWN,	KEY_UP, KEY_NUMLOCK, KEY_KPSLASH, KEY_KPASTERISK, KEY_KPMINUS,	KEY_KPPLUS, KEY_KPENTER, KEY_KP1, KEY_KP2, KEY_KP3, KEY_KP4, KEY_KP5,	KEY_KP6, KEY_KP7, KEY_KP8, KEY_KP9, KEY_KP0, KEY_KPDOT, KEY_102ND,	KEY_COMPOSE, KEY_POWER, KEY_KPEQUAL, KEY_F13, KEY_F14, KEY_F15,	KEY_F16, KEY_F17, KEY_F18, KEY_F19, KEY_F20, KEY_F21, KEY_F22,	KEY_F23, KEY_F24, KEY_OPEN, KEY_HELP, KEY_PROPS, KEY_FRONT, KEY_STOP,	KEY_AGAIN, KEY_UNDO, KEY_CUT, KEY_COPY, KEY_PASTE, KEY_FIND, KEY_MUTE,	KEY_VOLUMEUP, KEY_VOLUMEDOWN, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,	KEY_KPCOMMA, KEY_RESERVED, KEY_RO, KEY_KATAKANAHIRAGANA , KEY_YEN,	KEY_HENKAN, KEY_MUHENKAN, KEY_KPJPCOMMA, KEY_RESERVED, KEY_RESERVED,	KEY_RESERVED, KEY_HANGEUL, KEY_HANJA, KEY_KATAKANA, KEY_HIRAGANA,	KEY_ZENKAKUHANKAKU, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,	KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,	KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,	KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,	KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,	KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,	KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,	KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,	KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,	KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,	KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,	KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,	KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,	KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,	KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,	KEY_RESERVED, KEY_RESERVED, KEY_LEFTCTRL, KEY_LEFTSHIFT, KEY_LEFTALT,	KEY_LEFTMETA, KEY_RIGHTCTRL, KEY_RIGHTSHIFT, KEY_RIGHTALT,	KEY_RIGHTMETA, KEY_PLAYPAUSE, KEY_STOPCD, KEY_PREVIOUSSONG,	KEY_NEXTSONG, KEY_EJECTCD, KEY_VOLUMEUP, KEY_VOLUMEDOWN, KEY_MUTE,	KEY_WWW, KEY_BACK, KEY_FORWARD, KEY_STOP, KEY_FIND, KEY_SCROLLUP,	KEY_SCROLLDOWN, KEY_EDIT, KEY_SLEEP, KEY_SCREENLOCK, KEY_REFRESH,	KEY_CALC, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED}; static void dc_scan_kbd(struct dc_kbd *kbd){	struct input_dev *dev = kbd->dev;	void *ptr;	int code, keycode;	int i; 	for (i = 0; i < 8; i++) {		code = i + 224;		keycode = kbd->keycode[code];		input_event(dev, EV_MSC, MSC_SCAN, code);		input_report_key(dev, keycode, (kbd->new[0] >> i) & 1);	} 	for (i = 2; i < 8; i++) {		ptr = memchr(kbd->new + 2, kbd->old[i], 6);		code = kbd->old[i];		if (code > 3 && ptr == NULL) {			keycode = kbd->keycode[code];			if (keycode) {				input_event(dev, EV_MSC, MSC_SCAN, code);				input_report_key(dev, keycode, 0);			} else				dev_dbg(&dev->dev,					"Unknown key (scancode %#x) released.",					code);		}		ptr = memchr(kbd->old + 2, kbd->new[i], 6);		code = kbd->new[i];		if (code > 3 && ptr) {			keycode = kbd->keycode[code];			if (keycode) {				input_event(dev, EV_MSC, MSC_SCAN, code);				input_report_key(dev, keycode, 1);			} else				dev_dbg(&dev->dev,					"Unknown key (scancode %#x) pressed.",					code);		}	}	input_sync(dev);	memcpy(kbd->old, kbd->new, 8);} static void dc_kbd_callback(struct mapleq *mq){	struct maple_device *mapledev = mq->dev;	struct dc_kbd *kbd = maple_get_drvdata(mapledev);	unsigned long *buf = (unsigned long *)(mq->recvbuf->buf); 	/*	 * We should always get the lock because the only	 * time it may be locked is if the driver is in the cleanup phase.	 */	scoped_guard(mutex_try, &maple_keyb_mutex) {		if (buf[1] == mapledev->function) {			memcpy(kbd->new, buf + 2, 8);			dc_scan_kbd(kbd);		}	}} static int probe_maple_kbd(struct device *dev){	struct maple_device *mdev;	struct maple_driver *mdrv;	int i, error;	struct dc_kbd *kbd;	struct input_dev *idev; 	mdev = to_maple_dev(dev);	mdrv = to_maple_driver(dev->driver); 	kbd = kzalloc_obj(*kbd);	if (!kbd) {		error = -ENOMEM;		goto fail;	} 	idev = input_allocate_device();	if (!idev) {		error = -ENOMEM;		goto fail_idev_alloc;	} 	kbd->dev = idev;	memcpy(kbd->keycode, dc_kbd_keycode, sizeof(kbd->keycode)); 	maple_set_drvdata(mdev, kbd); 	idev->name = mdev->product_name;	idev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP);	idev->keycode = kbd->keycode;	idev->keycodesize = sizeof(unsigned short);	idev->keycodemax = ARRAY_SIZE(kbd->keycode);	idev->id.bustype = BUS_HOST;	idev->dev.parent = &mdev->dev; 	for (i = 0; i < NR_SCANCODES; i++)		__set_bit(dc_kbd_keycode[i], idev->keybit);	__clear_bit(KEY_RESERVED, idev->keybit); 	input_set_capability(idev, EV_MSC, MSC_SCAN); 	error = input_register_device(idev);	if (error)		goto fail_register; 	/* Maple polling is locked to VBLANK - which may be just 50/s */	maple_getcond_callback(mdev, dc_kbd_callback, HZ/50,		MAPLE_FUNC_KEYBOARD); 	mdev->driver = mdrv; 	return error; fail_register:	maple_set_drvdata(mdev, NULL);	input_free_device(idev);fail_idev_alloc:	kfree(kbd);fail:	return error;} static int remove_maple_kbd(struct device *dev){	struct maple_device *mdev = to_maple_dev(dev);	struct dc_kbd *kbd = maple_get_drvdata(mdev); 	guard(mutex)(&maple_keyb_mutex); 	input_unregister_device(kbd->dev);	kfree(kbd); 	maple_set_drvdata(mdev, NULL);	return 0;} static struct maple_driver dc_kbd_driver = {	.function = MAPLE_FUNC_KEYBOARD,	.drv = {		.name = "Dreamcast_keyboard",		.probe = probe_maple_kbd,		.remove = remove_maple_kbd,	},}; static int __init dc_kbd_init(void){	return maple_driver_register(&dc_kbd_driver);} static void __exit dc_kbd_exit(void){	maple_driver_unregister(&dc_kbd_driver);} module_init(dc_kbd_init);module_exit(dc_kbd_exit);