/* *  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/platform_device.h>#include <linux/init.h>#include <linux/input.h>#include <linux/interrupt.h>#include <linux/jiffies.h>#include <linux/module.h>#include <linux/slab.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 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;	spinlock_t lock;	struct timer_list timer;	struct timer_list htimer;	unsigned int suspended;	unsigned long suspend_jiffies;};#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;	unsigned long flags;	unsigned int num_pressed;	if (corgikbd_data->suspended)		return;	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++) {			unsigned int scancode, pressed;			scancode = SCANCODE(row, col);			pressed = rowd & KB_ROWMASK(row);			input_report_key(corgikbd_data->input, corgikbd_data->keycode[scancode], pressed);			if (pressed)				num_pressed++;			if (pressed && (corgikbd_data->keycode[scancode] == CORGI_KEY_OFF)					&& time_after(jiffies, corgikbd_data->suspend_jiffies + HZ)) {				input_event(corgikbd_data->input, EV_PWR, CORGI_KEY_OFF, 1);				corgikbd_data->suspend_jiffies=jiffies;			}		}		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. * * We debounce the switches and pass them to the input system. * *  gprr == 0x00 - Keyboard with Landscape Screen *          0x08 - No Keyboard with Portrait Screen *          0x0c - Keyboard and Screen Closed */#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(&corgiscoop_device.dev, 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);			input_report_switch(corgikbd_data->input, SW_0, ((sharpsl_hinge_state & CORGI_SCP_SWA) != 0));			input_report_switch(corgikbd_data->input, SW_1, ((sharpsl_hinge_state & CORGI_SCP_SWB) != 0));			input_sync(corgikbd_data->input);			spin_unlock_irqrestore(&corgikbd_data->lock, flags);		}	}	mod_timer(&corgikbd_data->htimer, jiffies + HINGE_SCAN_INTERVAL);}#ifdef CONFIG_PMstatic int corgikbd_suspend(struct platform_device *dev, pm_message_t state){	struct corgikbd *corgikbd = platform_get_drvdata(dev);	corgikbd->suspended = 1;	return 0;}static int corgikbd_resume(struct platform_device *dev){	struct corgikbd *corgikbd = platform_get_drvdata(dev);	/* Upon resume, ignore the suspend key for a short while */	corgikbd->suspend_jiffies=jiffies;	corgikbd->suspended = 0;	return 0;}#else#define corgikbd_suspend	NULL#define corgikbd_resume		NULL#endifstatic int __init corgikbd_probe(struct platform_device *pdev){	struct corgikbd *corgikbd;	struct input_dev *input_dev;	int i;	corgikbd = kzalloc(sizeof(struct corgikbd), GFP_KERNEL);	input_dev = input_allocate_device();	if (!corgikbd || !input_dev) {		kfree(corgikbd);		input_free_device(input_dev);		return -ENOMEM;	}	platform_set_drvdata(pdev, corgikbd);	corgikbd->input = input_dev;	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;	corgikbd->suspend_jiffies=jiffies;	memcpy(corgikbd->keycode, corgikbd_keycode, sizeof(corgikbd->keycode));	input_dev->name = "Corgi Keyboard";	input_dev->phys = "corgikbd/input0";	input_dev->id.bustype = BUS_HOST;	input_dev->id.vendor = 0x0001;	input_dev->id.product = 0x0001;	input_dev->id.version = 0x0100;	input_dev->cdev.dev = &pdev->dev;	input_dev->private = corgikbd;	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP) | BIT(EV_PWR) | BIT(EV_SW);	input_dev->keycode = corgikbd->keycode;	input_dev->keycodesize = sizeof(unsigned char);	input_dev->keycodemax = ARRAY_SIZE(corgikbd_keycode);	for (i = 0; i < ARRAY_SIZE(corgikbd_keycode); i++)		set_bit(corgikbd->keycode[i], input_dev->keybit);	clear_bit(0, input_dev->keybit);	set_bit(SW_0, input_dev->swbit);	set_bit(SW_1, input_dev->swbit);	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 | SA_TRIGGER_RISING,				"corgikbd", corgikbd))			printk(KERN_WARNING "corgikbd: Can't get IRQ: %d!\n", i);	}	/* 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);	return 0;}static int corgikbd_remove(struct platform_device *pdev){	int i;	struct corgikbd *corgikbd = platform_get_drvdata(pdev);	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 platform_driver corgikbd_driver = {	.probe		= corgikbd_probe,	.remove		= corgikbd_remove,	.suspend	= corgikbd_suspend,	.resume		= corgikbd_resume,	.driver		= {		.name	= "corgi-keyboard",	},};static int __devinit corgikbd_init(void){	return platform_driver_register(&corgikbd_driver);}static void __exit corgikbd_exit(void){	platform_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");