/* *  Copyright (c) 2005 John Lenz * * Based on from xtkbd.c *//* * LoCoMo keyboard driver for Linux/ARM *//* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */#include <linux/config.h>#include <linux/slab.h>#include <linux/module.h>#include <linux/init.h>#include <linux/input.h>#include <linux/delay.h>#include <linux/device.h>#include <linux/interrupt.h>#include <linux/ioport.h>#include <asm/hardware/locomo.h>#include <asm/irq.h>MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");MODULE_DESCRIPTION("LoCoMo keyboard driver");MODULE_LICENSE("GPL");#define LOCOMOKBD_NUMKEYS	128#define KEY_ACTIVITY		KEY_F16#define KEY_CONTACT		KEY_F18#define KEY_CENTER		KEY_F15static unsigned char locomokbd_keycode[LOCOMOKBD_NUMKEYS] = {	0, KEY_ESC, KEY_ACTIVITY, 0, 0, 0, 0, 0, 0, 0,				/* 0 - 9 */	0, 0, 0, 0, 0, 0, 0, KEY_MENU, KEY_HOME, KEY_CONTACT,			/* 10 - 19 */	0, 0, 0, 0, 0, 0, 0, 0, 0, 0,						/* 20 - 29 */	0, 0, 0, KEY_CENTER, 0, KEY_MAIL, 0, 0, 0, 0,				/* 30 - 39 */	0, 0, 0, 0, 0, 0, 0, 0, 0, KEY_RIGHT,					/* 40 - 49 */	KEY_UP, KEY_LEFT, 0, 0, KEY_P, 0, KEY_O, KEY_I, KEY_Y, KEY_T,		/* 50 - 59 */	KEY_E, KEY_W, 0, 0, 0, 0, KEY_DOWN, KEY_ENTER, 0, 0,			/* 60 - 69 */	KEY_BACKSPACE, 0, KEY_L, KEY_U, KEY_H, KEY_R, KEY_D, KEY_Q, 0, 0,	/* 70 - 79 */	0, 0, 0, 0, 0, 0, KEY_ENTER, KEY_RIGHTSHIFT, KEY_K, KEY_J,		/* 80 - 89 */	KEY_G, KEY_F, KEY_X, KEY_S, 0, 0, 0, 0, 0, 0,				/* 90 - 99 */	0, 0, KEY_DOT, 0, KEY_COMMA, KEY_N, KEY_B, KEY_C, KEY_Z, KEY_A,		/* 100 - 109 */	KEY_LEFTSHIFT, KEY_TAB, KEY_LEFTCTRL, 0, 0, 0, 0, 0, 0, 0,		/* 110 - 119 */	KEY_M, KEY_SPACE, KEY_V, KEY_APOSTROPHE, KEY_SLASH, 0, 0, 0		/* 120 - 128 */};#define KB_ROWS			16#define KB_COLS			8#define KB_ROWMASK(r)		(1 << (r))#define SCANCODE(c,r)		( ((c)<<4) + (r) + 1 )#define	NR_SCANCODES		128#define KB_DELAY		8#define SCAN_INTERVAL		(HZ/10)#define LOCOMOKBD_PRESSED	1struct locomokbd {	unsigned char keycode[LOCOMOKBD_NUMKEYS];	struct input_dev input;	char phys[32];	struct locomo_dev *ldev;	unsigned long base;	spinlock_t lock;	struct timer_list timer;};/* helper functions for reading the keyboard matrix */static inline void locomokbd_charge_all(unsigned long membase){	locomo_writel(0x00FF, membase + LOCOMO_KSC);}static inline void locomokbd_activate_all(unsigned long membase){	unsigned long r;	locomo_writel(0, membase + LOCOMO_KSC);	r = locomo_readl(membase + LOCOMO_KIC);	r &= 0xFEFF;	locomo_writel(r, membase + LOCOMO_KIC);}static inline void locomokbd_activate_col(unsigned long membase, int col){	unsigned short nset;	unsigned short nbset;	nset = 0xFF & ~(1 << col);	nbset = (nset << 8) + nset;	locomo_writel(nbset, membase + LOCOMO_KSC);}static inline void locomokbd_reset_col(unsigned long membase, int col){	unsigned short nbset;	nbset = ((0xFF & ~(1 << col)) << 8) + 0xFF;	locomo_writel(nbset, membase + LOCOMO_KSC);}/* * The LoCoMo keyboard only generates interrupts when a key is pressed. * So when a key is pressed, we enable a timer.  This timer scans the * keyboard, and this is how we detect when the key is released. *//* Scan the hardware keyboard and push any changes up through the input layer */static void locomokbd_scankeyboard(struct locomokbd *locomokbd, struct pt_regs *regs){	unsigned int row, col, rowd, scancode;	unsigned long flags;	unsigned int num_pressed;	unsigned long membase = locomokbd->base;	spin_lock_irqsave(&locomokbd->lock, flags);	if (regs)		input_regs(&locomokbd->input, regs);	locomokbd_charge_all(membase);	num_pressed = 0;	for (col = 0; col < KB_COLS; col++) {		locomokbd_activate_col(membase, col);		udelay(KB_DELAY);		rowd = ~locomo_readl(membase + LOCOMO_KIB);		for (row = 0; row < KB_ROWS; row++) {			scancode = SCANCODE(col, row);			if (rowd & KB_ROWMASK(row)) {				num_pressed += 1;				input_report_key(&locomokbd->input, locomokbd->keycode[scancode], 1);			} else {				input_report_key(&locomokbd->input, locomokbd->keycode[scancode], 0);			}		}		locomokbd_reset_col(membase, col);	}	locomokbd_activate_all(membase);	input_sync(&locomokbd->input);	/* if any keys are pressed, enable the timer */	if (num_pressed)		mod_timer(&locomokbd->timer, jiffies + SCAN_INTERVAL);	spin_unlock_irqrestore(&locomokbd->lock, flags);}/* * LoCoMo keyboard interrupt handler. */static irqreturn_t locomokbd_interrupt(int irq, void *dev_id, struct pt_regs *regs){	struct locomokbd *locomokbd = dev_id;	/** wait chattering delay **/	udelay(100);	locomokbd_scankeyboard(locomokbd, regs);	return IRQ_HANDLED;}/* * LoCoMo timer checking for released keys */static void locomokbd_timer_callback(unsigned long data){	struct locomokbd *locomokbd = (struct locomokbd *) data;	locomokbd_scankeyboard(locomokbd, NULL);}static int locomokbd_probe(struct locomo_dev *dev){	struct locomokbd *locomokbd;	int i, ret;	locomokbd = kmalloc(sizeof(struct locomokbd), GFP_KERNEL);	if (!locomokbd)		return -ENOMEM;	memset(locomokbd, 0, sizeof(struct locomokbd));	/* try and claim memory region */	if (!request_mem_region((unsigned long) dev->mapbase,				dev->length,				LOCOMO_DRIVER_NAME(dev))) {		ret = -EBUSY;		printk(KERN_ERR "locomokbd: Can't acquire access to io memory for keyboard\n");		goto free;	}	locomokbd->ldev = dev;	locomo_set_drvdata(dev, locomokbd);	locomokbd->base = (unsigned long) dev->mapbase;	spin_lock_init(&locomokbd->lock);	init_timer(&locomokbd->timer);	locomokbd->timer.function = locomokbd_timer_callback;	locomokbd->timer.data = (unsigned long) locomokbd;	locomokbd->input.evbit[0] = BIT(EV_KEY) | BIT(EV_REP);	init_input_dev(&locomokbd->input);	locomokbd->input.keycode = locomokbd->keycode;	locomokbd->input.keycodesize = sizeof(unsigned char);	locomokbd->input.keycodemax = ARRAY_SIZE(locomokbd_keycode);	locomokbd->input.private = locomokbd;	memcpy(locomokbd->keycode, locomokbd_keycode, sizeof(locomokbd->keycode));	for (i = 0; i < LOCOMOKBD_NUMKEYS; i++)		set_bit(locomokbd->keycode[i], locomokbd->input.keybit);	clear_bit(0, locomokbd->input.keybit);	strcpy(locomokbd->phys, "locomokbd/input0");	locomokbd->input.name = "LoCoMo keyboard";	locomokbd->input.phys = locomokbd->phys;	locomokbd->input.id.bustype = BUS_XTKBD;	locomokbd->input.id.vendor = 0x0001;	locomokbd->input.id.product = 0x0001;	locomokbd->input.id.version = 0x0100;	/* attempt to get the interrupt */	ret = request_irq(dev->irq[0], locomokbd_interrupt, 0, "locomokbd", locomokbd);	if (ret) {		printk(KERN_ERR "locomokbd: Can't get irq for keyboard\n");		goto out;	}	input_register_device(&locomokbd->input);	printk(KERN_INFO "input: LoCoMo keyboard on locomokbd\n");	return 0;out:	release_mem_region((unsigned long) dev->mapbase, dev->length);	locomo_set_drvdata(dev, NULL);free:	kfree(locomokbd);	return ret;}static int locomokbd_remove(struct locomo_dev *dev){	struct locomokbd *locomokbd = locomo_get_drvdata(dev);	free_irq(dev->irq[0], locomokbd);	del_timer_sync(&locomokbd->timer);	input_unregister_device(&locomokbd->input);	locomo_set_drvdata(dev, NULL);	release_mem_region((unsigned long) dev->mapbase, dev->length);	kfree(locomokbd);	return 0;}static struct locomo_driver keyboard_driver = {	.drv = {		.name = "locomokbd"	},	.devid	= LOCOMO_DEVID_KEYBOARD,	.probe	= locomokbd_probe,	.remove	= locomokbd_remove,};static int __init locomokbd_init(void){	return locomo_driver_register(&keyboard_driver);}static void __exit locomokbd_exit(void){	locomo_driver_unregister(&keyboard_driver);}module_init(locomokbd_init);module_exit(locomokbd_exit);