/* *  Keyboard driver for Sharp Corgi models (SL-C7xx) * *  Copyright (c) 2004-2005 Richard Purdie * *  Based on xtkbd.c/locomkbd.c * *  This program is free software; you can redistribute it and/or modify *  it under the terms of the GNU General Public License version 2 as *  published by the Free Software Foundation. * */#include <linux/delay.h>#include <linux/device.h>#include <linux/init.h>#include <linux/input.h>#include <linux/interrupt.h>#include <linux/module.h>#include <linux/slab.h>#include <asm/irq.h>#include <asm/arch/corgi.h>#include <asm/arch/hardware.h>#include <asm/arch/pxa-regs.h>#include <asm/hardware/scoop.h>#define KB_ROWS				8#define KB_COLS				12#define KB_ROWMASK(r)		(1 << (r))#define SCANCODE(r,c)		( ((r)<<4) + (c) + 1 )/* zero code, 124 scancodes + 3 hinge combinations */#define	NR_SCANCODES		( SCANCODE(KB_ROWS-1,KB_COLS-1) +1 +1 +3 )#define SCAN_INTERVAL		(HZ/10)#define CORGIKBD_PRESSED	1#define HINGE_SCAN_INTERVAL		(HZ/4)#define CORGI_KEY_CALENDER	KEY_F1#define CORGI_KEY_ADDRESS	KEY_F2#define CORGI_KEY_FN		KEY_F3#define CORGI_KEY_CANCEL	KEY_F4#define CORGI_KEY_OFF		KEY_SUSPEND#define CORGI_KEY_EXOK		KEY_F5#define CORGI_KEY_EXCANCEL	KEY_F6#define CORGI_KEY_EXJOGDOWN	KEY_F7#define CORGI_KEY_EXJOGUP	KEY_F8#define CORGI_KEY_JAP1		KEY_LEFTCTRL#define CORGI_KEY_JAP2		KEY_LEFTALT#define CORGI_KEY_MAIL		KEY_F10#define CORGI_KEY_OK		KEY_F11#define CORGI_KEY_MENU		KEY_F12#define CORGI_HINGE_0		KEY_KP0#define CORGI_HINGE_1		KEY_KP1#define CORGI_HINGE_2		KEY_KP2static unsigned char corgikbd_keycode[NR_SCANCODES] = {	0,                                                                                                                /* 0 */	0, KEY_1, KEY_3, KEY_5, KEY_6, KEY_7, KEY_9, KEY_0, KEY_BACKSPACE, 0, 0, 0, 0, 0, 0, 0, 	                      /* 1-16 */	0, KEY_2, KEY_4, KEY_R, KEY_Y, KEY_8, KEY_I, KEY_O, KEY_P, 0, 0, 0, 0, 0, 0, 0,                                   /* 17-32 */	KEY_TAB, KEY_Q, KEY_E, KEY_T, KEY_G, KEY_U, KEY_J, KEY_K, 0, 0, 0, 0, 0, 0, 0, 0,                                 /* 33-48 */	CORGI_KEY_CALENDER, KEY_W, KEY_S, KEY_F, KEY_V, KEY_H, KEY_M, KEY_L, 0, KEY_RIGHTSHIFT, 0, 0, 0, 0, 0, 0,         /* 49-64 */	CORGI_KEY_ADDRESS, KEY_A, KEY_D, KEY_C, KEY_B, KEY_N, KEY_DOT, 0, KEY_ENTER, 0, KEY_LEFTSHIFT, 0, 0, 0, 0, 0, 	  /* 65-80 */	CORGI_KEY_MAIL, KEY_Z, KEY_X, KEY_MINUS, KEY_SPACE, KEY_COMMA, 0, KEY_UP, 0, 0, 0, CORGI_KEY_FN, 0, 0, 0, 0,            /* 81-96 */	KEY_SYSRQ, CORGI_KEY_JAP1, CORGI_KEY_JAP2, CORGI_KEY_CANCEL, CORGI_KEY_OK, CORGI_KEY_MENU, KEY_LEFT, KEY_DOWN, KEY_RIGHT, 0, 0, 0, 0, 0, 0, 0,  /* 97-112 */	CORGI_KEY_OFF, CORGI_KEY_EXOK, CORGI_KEY_EXCANCEL, CORGI_KEY_EXJOGDOWN, CORGI_KEY_EXJOGUP, 0, 0, 0, 0, 0, 0, 0,   /* 113-124 */	CORGI_HINGE_0, CORGI_HINGE_1, CORGI_HINGE_2	  /* 125-127 */};struct corgikbd {	unsigned char keycode[ARRAY_SIZE(corgikbd_keycode)];	struct input_dev input;	char phys[32];	unsigned char state[ARRAY_SIZE(corgikbd_keycode)];	spinlock_t lock;	struct timer_list timer;	struct timer_list htimer;};static void handle_scancode(unsigned int pressed,unsigned int scancode, struct corgikbd *corgikbd_data){	if (pressed && !(corgikbd_data->state[scancode] & CORGIKBD_PRESSED)) {		corgikbd_data->state[scancode] |= CORGIKBD_PRESSED;		input_report_key(&corgikbd_data->input, corgikbd_data->keycode[scancode], 1);		if (corgikbd_data->keycode[scancode] == CORGI_KEY_OFF)			input_event(&corgikbd_data->input, EV_PWR, CORGI_KEY_OFF, 1);	} else if (!pressed && corgikbd_data->state[scancode] & CORGIKBD_PRESSED) {		corgikbd_data->state[scancode] &= ~CORGIKBD_PRESSED;		input_report_key(&corgikbd_data->input, corgikbd_data->keycode[scancode], 0);	}}#define KB_DISCHARGE_DELAY	10#define KB_ACTIVATE_DELAY	10/* Helper functions for reading the keyboard matrix * Note: We should really be using pxa_gpio_mode to alter GPDR but it *       requires a function call per GPIO bit which is excessive *       when we need to access 12 bits at once multiple times. * These functions must be called within local_irq_save()/local_irq_restore() * or similar. */static inline void corgikbd_discharge_all(void){	// STROBE All HiZ	GPCR2  = CORGI_GPIO_ALL_STROBE_BIT;	GPDR2 &= ~CORGI_GPIO_ALL_STROBE_BIT;}static inline void corgikbd_activate_all(void){	// STROBE ALL -> High	GPSR2  = CORGI_GPIO_ALL_STROBE_BIT;	GPDR2 |= CORGI_GPIO_ALL_STROBE_BIT;	udelay(KB_DISCHARGE_DELAY);	// Clear any interrupts we may have triggered when altering the GPIO lines	GEDR1 = CORGI_GPIO_HIGH_SENSE_BIT;	GEDR2 = CORGI_GPIO_LOW_SENSE_BIT;}static inline void corgikbd_activate_col(int col){	// STROBE col -> High, not col -> HiZ	GPSR2 = CORGI_GPIO_STROBE_BIT(col);	GPDR2 = (GPDR2 & ~CORGI_GPIO_ALL_STROBE_BIT) | CORGI_GPIO_STROBE_BIT(col);}static inline void corgikbd_reset_col(int col){	// STROBE col -> Low	GPCR2 = CORGI_GPIO_STROBE_BIT(col);	// STROBE col -> out, not col -> HiZ	GPDR2 = (GPDR2 & ~CORGI_GPIO_ALL_STROBE_BIT) | CORGI_GPIO_STROBE_BIT(col);}#define GET_ROWS_STATUS(c)	(((GPLR1 & CORGI_GPIO_HIGH_SENSE_BIT) >> CORGI_GPIO_HIGH_SENSE_RSHIFT) | ((GPLR2 & CORGI_GPIO_LOW_SENSE_BIT) << CORGI_GPIO_LOW_SENSE_LSHIFT))/* * The corgi keyboard only generates interrupts when a key is pressed. * When a key is pressed, we enable a timer which then scans the * keyboard to detect when the key is released. *//* Scan the hardware keyboard and push any changes up through the input layer */static void corgikbd_scankeyboard(struct corgikbd *corgikbd_data, struct pt_regs *regs){	unsigned int row, col, rowd, scancode;	unsigned long flags;	unsigned int num_pressed;	spin_lock_irqsave(&corgikbd_data->lock, flags);	if (regs)		input_regs(&corgikbd_data->input, regs);	num_pressed = 0;	for (col = 0; col < KB_COLS; col++) {		/*		 * Discharge the output driver capacitatance		 * in the keyboard matrix. (Yes it is significant..)		 */		corgikbd_discharge_all();		udelay(KB_DISCHARGE_DELAY);		corgikbd_activate_col(col);		udelay(KB_ACTIVATE_DELAY);		rowd = GET_ROWS_STATUS(col);		for (row = 0; row < KB_ROWS; row++) {			scancode = SCANCODE(row, col);			handle_scancode((rowd & KB_ROWMASK(row)), scancode, corgikbd_data);			if (rowd & KB_ROWMASK(row))				num_pressed++;		}		corgikbd_reset_col(col);	}	corgikbd_activate_all();	input_sync(&corgikbd_data->input);	/* if any keys are pressed, enable the timer */	if (num_pressed)		mod_timer(&corgikbd_data->timer, jiffies + SCAN_INTERVAL);	spin_unlock_irqrestore(&corgikbd_data->lock, flags);}/* * corgi keyboard interrupt handler. */static irqreturn_t corgikbd_interrupt(int irq, void *dev_id, struct pt_regs *regs){	struct corgikbd *corgikbd_data = dev_id;	if (!timer_pending(&corgikbd_data->timer)) {		/** wait chattering delay **/		udelay(20);		corgikbd_scankeyboard(corgikbd_data, regs);	}	return IRQ_HANDLED;}/* * corgi timer checking for released keys */static void corgikbd_timer_callback(unsigned long data){	struct corgikbd *corgikbd_data = (struct corgikbd *) data;	corgikbd_scankeyboard(corgikbd_data, NULL);}/* * The hinge switches generate no interrupt so they need to be * monitored by a timer. * * When we detect changes, we debounce it and then pass the three * positions the system can take as keypresses to the input system. */#define HINGE_STABLE_COUNT 2static int sharpsl_hinge_state;static int hinge_count;static void corgikbd_hinge_timer(unsigned long data){	struct corgikbd *corgikbd_data = (struct corgikbd *) data;	unsigned long gprr;	unsigned long flags;	gprr = read_scoop_reg(SCOOP_GPRR) & (CORGI_SCP_SWA | CORGI_SCP_SWB);	if (gprr != sharpsl_hinge_state) {		hinge_count = 0;		sharpsl_hinge_state = gprr;	} else if (hinge_count < HINGE_STABLE_COUNT) {		hinge_count++;		if (hinge_count >= HINGE_STABLE_COUNT) {			spin_lock_irqsave(&corgikbd_data->lock, flags);			handle_scancode((sharpsl_hinge_state == 0x00), 125, corgikbd_data); /* Keyboard with Landscape Screen */			handle_scancode((sharpsl_hinge_state == 0x08), 126, corgikbd_data); /* No Keyboard with Portrait Screen */			handle_scancode((sharpsl_hinge_state == 0x0c), 127, corgikbd_data); /* Keyboard and Screen Closed  */			input_sync(&corgikbd_data->input);			spin_unlock_irqrestore(&corgikbd_data->lock, flags);		}	}	mod_timer(&corgikbd_data->htimer, jiffies + HINGE_SCAN_INTERVAL);}static int __init corgikbd_probe(struct device *dev){	int i;	struct corgikbd *corgikbd;	corgikbd = kcalloc(1, sizeof(struct corgikbd), GFP_KERNEL);	if (!corgikbd)		return -ENOMEM;	dev_set_drvdata(dev,corgikbd);	strcpy(corgikbd->phys, "corgikbd/input0");	spin_lock_init(corgikbd->lock);	/* Init Keyboard rescan timer */	init_timer(&corgikbd->timer);	corgikbd->timer.function = corgikbd_timer_callback;	corgikbd->timer.data = (unsigned long) corgikbd;	/* Init Hinge Timer */	init_timer(&corgikbd->htimer);	corgikbd->htimer.function = corgikbd_hinge_timer;	corgikbd->htimer.data = (unsigned long) corgikbd;	init_input_dev(&corgikbd->input);	corgikbd->input.private = corgikbd;	corgikbd->input.name = "Corgi Keyboard";	corgikbd->input.dev = dev;	corgikbd->input.phys = corgikbd->phys;	corgikbd->input.id.bustype = BUS_HOST;	corgikbd->input.id.vendor = 0x0001;	corgikbd->input.id.product = 0x0001;	corgikbd->input.id.version = 0x0100;	corgikbd->input.evbit[0] = BIT(EV_KEY) | BIT(EV_REP) | BIT(EV_PWR);	corgikbd->input.keycode = corgikbd->keycode;	corgikbd->input.keycodesize = sizeof(unsigned char);	corgikbd->input.keycodemax = ARRAY_SIZE(corgikbd_keycode);	memcpy(corgikbd->keycode, corgikbd_keycode, sizeof(corgikbd->keycode));	for (i = 0; i < ARRAY_SIZE(corgikbd_keycode); i++)		set_bit(corgikbd->keycode[i], corgikbd->input.keybit);	clear_bit(0, corgikbd->input.keybit);	input_register_device(&corgikbd->input);	mod_timer(&corgikbd->htimer, jiffies + HINGE_SCAN_INTERVAL);	/* Setup sense interrupts - RisingEdge Detect, sense lines as inputs */	for (i = 0; i < CORGI_KEY_SENSE_NUM; i++) {		pxa_gpio_mode(CORGI_GPIO_KEY_SENSE(i) | GPIO_IN);		if (request_irq(CORGI_IRQ_GPIO_KEY_SENSE(i), corgikbd_interrupt,						SA_INTERRUPT, "corgikbd", corgikbd))			printk(KERN_WARNING "corgikbd: Can't get IRQ: %d!\n", i);		else			set_irq_type(CORGI_IRQ_GPIO_KEY_SENSE(i),IRQT_RISING);	}	/* Set Strobe lines as outputs - set high */	for (i = 0; i < CORGI_KEY_STROBE_NUM; i++)		pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) | GPIO_OUT | GPIO_DFLT_HIGH);	printk(KERN_INFO "input: Corgi Keyboard Registered\n");	return 0;}static int corgikbd_remove(struct device *dev){	int i;	struct corgikbd *corgikbd = dev_get_drvdata(dev);	for (i = 0; i < CORGI_KEY_SENSE_NUM; i++)		free_irq(CORGI_IRQ_GPIO_KEY_SENSE(i), corgikbd);	del_timer_sync(&corgikbd->htimer);	del_timer_sync(&corgikbd->timer);	input_unregister_device(&corgikbd->input);	kfree(corgikbd);	return 0;}static struct device_driver corgikbd_driver = {	.name		= "corgi-keyboard",	.bus		= &platform_bus_type,	.probe		= corgikbd_probe,	.remove		= corgikbd_remove,};static int __devinit corgikbd_init(void){	return driver_register(&corgikbd_driver);}static void __exit corgikbd_exit(void){	driver_unregister(&corgikbd_driver);}module_init(corgikbd_init);module_exit(corgikbd_exit);MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");MODULE_DESCRIPTION("Corgi Keyboard Driver");MODULE_LICENSE("GPLv2");