[mirror_ubuntu-eoan-kernel.git] / drivers / input / keyboard / corgikbd.c

/*
 *  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 */
#define	NR_SCANCODES		( SCANCODE(KB_ROWS-1,KB_COLS-1) +1 +1 )

#define SCAN_INTERVAL		(50) /* ms */
#define HINGE_SCAN_INTERVAL	(250) /* ms */

#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

static 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 */
};


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 + msecs_to_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 READ_GPIO_BIT(x)    (GPLR(x) & GPIO_bit(x))
#define HINGE_STABLE_COUNT 2
static 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);
	gprr |= (READ_GPIO_BIT(CORGI_GPIO_AK_INT) != 0);
	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_LID, ((sharpsl_hinge_state & CORGI_SCP_SWA) != 0));
			input_report_switch(corgikbd_data->input, SW_TABLET_MODE, ((sharpsl_hinge_state & CORGI_SCP_SWB) != 0));
			input_report_switch(corgikbd_data->input, SW_HEADPHONE_INSERT, (READ_GPIO_BIT(CORGI_GPIO_AK_INT) != 0));
			input_sync(corgikbd_data->input);

			spin_unlock_irqrestore(&corgikbd_data->lock, flags);
		}
	}
	mod_timer(&corgikbd_data->htimer, jiffies + msecs_to_jiffies(HINGE_SCAN_INTERVAL));
}

#ifdef CONFIG_PM
static int corgikbd_suspend(struct platform_device *dev, pm_message_t state)
{
	int i;
	struct corgikbd *corgikbd = platform_get_drvdata(dev);

	corgikbd->suspended = 1;
	/* strobe 0 is the power key so this can't be made an input for
	   powersaving therefore i = 1 */
	for (i = 1; i < CORGI_KEY_STROBE_NUM; i++)
		pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) | GPIO_IN);

	return 0;
}

static int corgikbd_resume(struct platform_device *dev)
{
	int i;
	struct corgikbd *corgikbd = platform_get_drvdata(dev);

	for (i = 1; i < CORGI_KEY_STROBE_NUM; i++)
		pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) | GPIO_OUT | GPIO_DFLT_HIGH);

	/* 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
#endif

static 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_LID, input_dev->swbit);
	set_bit(SW_TABLET_MODE, input_dev->swbit);
	set_bit(SW_HEADPHONE_INSERT, input_dev->swbit);

	input_register_device(corgikbd->input);

	mod_timer(&corgikbd->htimer, jiffies + msecs_to_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,
				IRQF_DISABLED | IRQF_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);

	/* Setup the headphone jack as an input */
	pxa_gpio_mode(CORGI_GPIO_AK_INT | GPIO_IN);

	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");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Keyboard driver for Sharp Corgi models (SL-C7xx)
	3	*
	4	* Copyright (c) 2004-2005 Richard Purdie
	5	*
	6	* Based on xtkbd.c/locomkbd.c
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*
	12	*/
	13
	14	#include <linux/delay.h>
d052d1be	15	#include <linux/platform_device.h>
1da177e4 LT	16	#include <linux/init.h>
	17	#include <linux/input.h>
	18	#include <linux/interrupt.h>
8240a4a4	19	#include <linux/jiffies.h>
1da177e4 LT	20	#include <linux/module.h>
1da177e4 LT	21	#include <linux/slab.h>
1da177e4 LT	22
	23	#include <asm/arch/corgi.h>
	24	#include <asm/arch/hardware.h>
	25	#include <asm/arch/pxa-regs.h>
	26	#include <asm/hardware/scoop.h>
	27
	28	#define KB_ROWS 8
	29	#define KB_COLS 12
	30	#define KB_ROWMASK(r) (1 << (r))
	31	#define SCANCODE(r,c) ( ((r)<<4) + (c) + 1 )
4872f788 RP	32	/* zero code, 124 scancodes */
4872f788 RP	33	#define NR_SCANCODES ( SCANCODE(KB_ROWS-1,KB_COLS-1) +1 +1 )
1da177e4	34
4872f788 RP	35	#define SCAN_INTERVAL (50) /* ms */
4872f788 RP	36	#define HINGE_SCAN_INTERVAL (250) /* ms */
1da177e4 LT	37
	38	#define CORGI_KEY_CALENDER KEY_F1
	39	#define CORGI_KEY_ADDRESS KEY_F2
	40	#define CORGI_KEY_FN KEY_F3
6af2cf59	41	#define CORGI_KEY_CANCEL KEY_F4
1da177e4 LT	42	#define CORGI_KEY_OFF KEY_SUSPEND
	43	#define CORGI_KEY_EXOK KEY_F5
	44	#define CORGI_KEY_EXCANCEL KEY_F6
	45	#define CORGI_KEY_EXJOGDOWN KEY_F7
	46	#define CORGI_KEY_EXJOGUP KEY_F8
	47	#define CORGI_KEY_JAP1 KEY_LEFTCTRL
	48	#define CORGI_KEY_JAP2 KEY_LEFTALT
6af2cf59	49	#define CORGI_KEY_MAIL KEY_F10
1da177e4 LT	50	#define CORGI_KEY_OK KEY_F11
1da177e4 LT	51	#define CORGI_KEY_MENU KEY_F12
1da177e4 LT	52
	53	static unsigned char corgikbd_keycode[NR_SCANCODES] = {
	54	0, /* 0 */
	55	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 */
	56	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 */
	57	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 */
	58	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 */
	59	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 */
6af2cf59 RP	60	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 */
6af2cf59 RP	61	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 */
1da177e4	62	CORGI_KEY_OFF, CORGI_KEY_EXOK, CORGI_KEY_EXCANCEL, CORGI_KEY_EXJOGDOWN, CORGI_KEY_EXJOGUP, 0, 0, 0, 0, 0, 0, 0, /* 113-124 */
1da177e4 LT	63	};
	64
	65
	66	struct corgikbd {
	67	unsigned char keycode[ARRAY_SIZE(corgikbd_keycode)];
3c42f0c3	68	struct input_dev *input;
1da177e4	69
1da177e4	70	spinlock_t lock;
1da177e4 LT	71	struct timer_list timer;
1da177e4 LT	72	struct timer_list htimer;
8240a4a4 RP	73
	74	unsigned int suspended;
	75	unsigned long suspend_jiffies;
1da177e4 LT	76	};
1da177e4 LT	77
1da177e4 LT	78	#define KB_DISCHARGE_DELAY 10
	79	#define KB_ACTIVATE_DELAY 10
	80
	81	/* Helper functions for reading the keyboard matrix
	82	* Note: We should really be using pxa_gpio_mode to alter GPDR but it
	83	* requires a function call per GPIO bit which is excessive
	84	* when we need to access 12 bits at once multiple times.
	85	* These functions must be called within local_irq_save()/local_irq_restore()
	86	* or similar.
	87	*/
	88	static inline void corgikbd_discharge_all(void)
	89	{
948e12f0	90	/* STROBE All HiZ */
1da177e4 LT	91	GPCR2 = CORGI_GPIO_ALL_STROBE_BIT;
	92	GPDR2 &= ~CORGI_GPIO_ALL_STROBE_BIT;
	93	}
	94
	95	static inline void corgikbd_activate_all(void)
	96	{
948e12f0	97	/* STROBE ALL -> High */
1da177e4 LT	98	GPSR2 = CORGI_GPIO_ALL_STROBE_BIT;
	99	GPDR2 \|= CORGI_GPIO_ALL_STROBE_BIT;
	100
	101	udelay(KB_DISCHARGE_DELAY);
	102
948e12f0	103	/* Clear any interrupts we may have triggered when altering the GPIO lines */
1da177e4 LT	104	GEDR1 = CORGI_GPIO_HIGH_SENSE_BIT;
	105	GEDR2 = CORGI_GPIO_LOW_SENSE_BIT;
	106	}
	107
	108	static inline void corgikbd_activate_col(int col)
	109	{
948e12f0	110	/* STROBE col -> High, not col -> HiZ */
1da177e4 LT	111	GPSR2 = CORGI_GPIO_STROBE_BIT(col);
	112	GPDR2 = (GPDR2 & ~CORGI_GPIO_ALL_STROBE_BIT) \| CORGI_GPIO_STROBE_BIT(col);
	113	}
	114
	115	static inline void corgikbd_reset_col(int col)
	116	{
948e12f0	117	/* STROBE col -> Low */
1da177e4	118	GPCR2 = CORGI_GPIO_STROBE_BIT(col);
948e12f0	119	/* STROBE col -> out, not col -> HiZ */
1da177e4 LT	120	GPDR2 = (GPDR2 & ~CORGI_GPIO_ALL_STROBE_BIT) \| CORGI_GPIO_STROBE_BIT(col);
	121	}
	122
	123	#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))
	124
	125	/*
	126	* The corgi keyboard only generates interrupts when a key is pressed.
	127	* When a key is pressed, we enable a timer which then scans the
	128	* keyboard to detect when the key is released.
	129	*/
	130
	131	/* Scan the hardware keyboard and push any changes up through the input layer */
	132	static void corgikbd_scankeyboard(struct corgikbd corgikbd_data, struct pt_regs regs)
	133	{
948e12f0	134	unsigned int row, col, rowd;
1da177e4 LT	135	unsigned long flags;
	136	unsigned int num_pressed;
	137
8240a4a4 RP	138	if (corgikbd_data->suspended)
	139	return;
	140
1da177e4 LT	141	spin_lock_irqsave(&corgikbd_data->lock, flags);
	142
	143	if (regs)
3c42f0c3	144	input_regs(corgikbd_data->input, regs);
1da177e4 LT	145
	146	num_pressed = 0;
	147	for (col = 0; col < KB_COLS; col++) {
	148	/*
	149	* Discharge the output driver capacitatance
	150	* in the keyboard matrix. (Yes it is significant..)
	151	*/
	152
	153	corgikbd_discharge_all();
	154	udelay(KB_DISCHARGE_DELAY);
	155
	156	corgikbd_activate_col(col);
	157	udelay(KB_ACTIVATE_DELAY);
	158
	159	rowd = GET_ROWS_STATUS(col);
	160	for (row = 0; row < KB_ROWS; row++) {
948e12f0 RP	161	unsigned int scancode, pressed;
948e12f0 RP	162
1da177e4	163	scancode = SCANCODE(row, col);
948e12f0 RP	164	pressed = rowd & KB_ROWMASK(row);
948e12f0 RP	165
3c42f0c3	166	input_report_key(corgikbd_data->input, corgikbd_data->keycode[scancode], pressed);
948e12f0 RP	167
948e12f0 RP	168	if (pressed)
1da177e4	169	num_pressed++;
948e12f0 RP	170
	171	if (pressed && (corgikbd_data->keycode[scancode] == CORGI_KEY_OFF)
	172	&& time_after(jiffies, corgikbd_data->suspend_jiffies + HZ)) {
3c42f0c3	173	input_event(corgikbd_data->input, EV_PWR, CORGI_KEY_OFF, 1);
948e12f0 RP	174	corgikbd_data->suspend_jiffies=jiffies;
948e12f0 RP	175	}
1da177e4 LT	176	}
	177	corgikbd_reset_col(col);
	178	}
	179
	180	corgikbd_activate_all();
	181
3c42f0c3	182	input_sync(corgikbd_data->input);
1da177e4 LT	183
	184	/* if any keys are pressed, enable the timer */
	185	if (num_pressed)
4872f788	186	mod_timer(&corgikbd_data->timer, jiffies + msecs_to_jiffies(SCAN_INTERVAL));
1da177e4 LT	187
	188	spin_unlock_irqrestore(&corgikbd_data->lock, flags);
	189	}
	190
	191	/*
	192	* corgi keyboard interrupt handler.
	193	*/
	194	static irqreturn_t corgikbd_interrupt(int irq, void dev_id, struct pt_regs regs)
	195	{
	196	struct corgikbd *corgikbd_data = dev_id;
	197
	198	if (!timer_pending(&corgikbd_data->timer)) {
	199	/ wait chattering delay /
	200	udelay(20);
	201	corgikbd_scankeyboard(corgikbd_data, regs);
	202	}
	203
	204	return IRQ_HANDLED;
	205	}
	206
	207	/*
	208	* corgi timer checking for released keys
	209	*/
	210	static void corgikbd_timer_callback(unsigned long data)
	211	{
	212	struct corgikbd corgikbd_data = (struct corgikbd ) data;
	213	corgikbd_scankeyboard(corgikbd_data, NULL);
	214	}
	215
	216	/*
	217	* The hinge switches generate no interrupt so they need to be
	218	* monitored by a timer.
	219	*
948e12f0 RP	220	* We debounce the switches and pass them to the input system.
	221	*
	222	* gprr == 0x00 - Keyboard with Landscape Screen
	223	* 0x08 - No Keyboard with Portrait Screen
	224	* 0x0c - Keyboard and Screen Closed
1da177e4 LT	225	*/
1da177e4 LT	226
4872f788	227	#define READ_GPIO_BIT(x) (GPLR(x) & GPIO_bit(x))
1da177e4 LT	228	#define HINGE_STABLE_COUNT 2
	229	static int sharpsl_hinge_state;
	230	static int hinge_count;
	231
	232	static void corgikbd_hinge_timer(unsigned long data)
	233	{
	234	struct corgikbd corgikbd_data = (struct corgikbd ) data;
	235	unsigned long gprr;
	236	unsigned long flags;
	237
aba5a4c0	238	gprr = read_scoop_reg(&corgiscoop_device.dev, SCOOP_GPRR) & (CORGI_SCP_SWA \| CORGI_SCP_SWB);
4872f788	239	gprr \|= (READ_GPIO_BIT(CORGI_GPIO_AK_INT) != 0);
1da177e4 LT	240	if (gprr != sharpsl_hinge_state) {
	241	hinge_count = 0;
	242	sharpsl_hinge_state = gprr;
	243	} else if (hinge_count < HINGE_STABLE_COUNT) {
	244	hinge_count++;
	245	if (hinge_count >= HINGE_STABLE_COUNT) {
	246	spin_lock_irqsave(&corgikbd_data->lock, flags);
	247
ed8f9e2f RP	248	input_report_switch(corgikbd_data->input, SW_LID, ((sharpsl_hinge_state & CORGI_SCP_SWA) != 0));
	249	input_report_switch(corgikbd_data->input, SW_TABLET_MODE, ((sharpsl_hinge_state & CORGI_SCP_SWB) != 0));
	250	input_report_switch(corgikbd_data->input, SW_HEADPHONE_INSERT, (READ_GPIO_BIT(CORGI_GPIO_AK_INT) != 0));
3c42f0c3	251	input_sync(corgikbd_data->input);
1da177e4 LT	252
	253	spin_unlock_irqrestore(&corgikbd_data->lock, flags);
	254	}
	255	}
4872f788	256	mod_timer(&corgikbd_data->htimer, jiffies + msecs_to_jiffies(HINGE_SCAN_INTERVAL));
1da177e4 LT	257	}
1da177e4 LT	258
8240a4a4	259	#ifdef CONFIG_PM
3ae5eaec	260	static int corgikbd_suspend(struct platform_device *dev, pm_message_t state)
8240a4a4	261	{
4872f788	262	int i;
3ae5eaec	263	struct corgikbd *corgikbd = platform_get_drvdata(dev);
4872f788	264
9480e307	265	corgikbd->suspended = 1;
4872f788 RP	266	/* strobe 0 is the power key so this can't be made an input for
	267	powersaving therefore i = 1 */
	268	for (i = 1; i < CORGI_KEY_STROBE_NUM; i++)
	269	pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) \| GPIO_IN);
9480e307	270
8240a4a4 RP	271	return 0;
	272	}
	273
3ae5eaec	274	static int corgikbd_resume(struct platform_device *dev)
8240a4a4	275	{
4872f788	276	int i;
3ae5eaec	277	struct corgikbd *corgikbd = platform_get_drvdata(dev);
9480e307	278
4872f788 RP	279	for (i = 1; i < CORGI_KEY_STROBE_NUM; i++)
	280	pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) \| GPIO_OUT \| GPIO_DFLT_HIGH);
	281
9480e307 RK	282	/* Upon resume, ignore the suspend key for a short while */
	283	corgikbd->suspend_jiffies=jiffies;
	284	corgikbd->suspended = 0;
8240a4a4	285
8240a4a4 RP	286	return 0;
	287	}
	288	#else
	289	#define corgikbd_suspend NULL
	290	#define corgikbd_resume NULL
	291	#endif
	292
3ae5eaec	293	static int __init corgikbd_probe(struct platform_device *pdev)
1da177e4	294	{
1da177e4	295	struct corgikbd *corgikbd;
3c42f0c3 DT	296	struct input_dev *input_dev;
3c42f0c3 DT	297	int i;
1da177e4	298
a97e148a	299	corgikbd = kzalloc(sizeof(struct corgikbd), GFP_KERNEL);
3c42f0c3 DT	300	input_dev = input_allocate_device();
	301	if (!corgikbd \|\| !input_dev) {
	302	kfree(corgikbd);
	303	input_free_device(input_dev);
1da177e4	304	return -ENOMEM;
3c42f0c3	305	}
1da177e4	306
3ae5eaec	307	platform_set_drvdata(pdev, corgikbd);
1da177e4	308
3c42f0c3	309	corgikbd->input = input_dev;
aba5a4c0	310	spin_lock_init(&corgikbd->lock);
1da177e4 LT	311
	312	/* Init Keyboard rescan timer */
	313	init_timer(&corgikbd->timer);
	314	corgikbd->timer.function = corgikbd_timer_callback;
	315	corgikbd->timer.data = (unsigned long) corgikbd;
	316
	317	/* Init Hinge Timer */
	318	init_timer(&corgikbd->htimer);
	319	corgikbd->htimer.function = corgikbd_hinge_timer;
	320	corgikbd->htimer.data = (unsigned long) corgikbd;
	321
8240a4a4 RP	322	corgikbd->suspend_jiffies=jiffies;
8240a4a4 RP	323
1da177e4	324	memcpy(corgikbd->keycode, corgikbd_keycode, sizeof(corgikbd->keycode));
3c42f0c3 DT	325
	326	input_dev->name = "Corgi Keyboard";
	327	input_dev->phys = "corgikbd/input0";
	328	input_dev->id.bustype = BUS_HOST;
	329	input_dev->id.vendor = 0x0001;
	330	input_dev->id.product = 0x0001;
	331	input_dev->id.version = 0x0100;
3ae5eaec	332	input_dev->cdev.dev = &pdev->dev;
3c42f0c3 DT	333	input_dev->private = corgikbd;
	334
	335	input_dev->evbit[0] = BIT(EV_KEY) \| BIT(EV_REP) \| BIT(EV_PWR) \| BIT(EV_SW);
	336	input_dev->keycode = corgikbd->keycode;
	337	input_dev->keycodesize = sizeof(unsigned char);
	338	input_dev->keycodemax = ARRAY_SIZE(corgikbd_keycode);
	339
1da177e4	340	for (i = 0; i < ARRAY_SIZE(corgikbd_keycode); i++)
3c42f0c3 DT	341	set_bit(corgikbd->keycode[i], input_dev->keybit);
3c42f0c3 DT	342	clear_bit(0, input_dev->keybit);
ed8f9e2f RP	343	set_bit(SW_LID, input_dev->swbit);
	344	set_bit(SW_TABLET_MODE, input_dev->swbit);
	345	set_bit(SW_HEADPHONE_INSERT, input_dev->swbit);
3c42f0c3 DT	346
3c42f0c3 DT	347	input_register_device(corgikbd->input);
1da177e4	348
4872f788	349	mod_timer(&corgikbd->htimer, jiffies + msecs_to_jiffies(HINGE_SCAN_INTERVAL));
1da177e4 LT	350
	351	/* Setup sense interrupts - RisingEdge Detect, sense lines as inputs */
	352	for (i = 0; i < CORGI_KEY_SENSE_NUM; i++) {
	353	pxa_gpio_mode(CORGI_GPIO_KEY_SENSE(i) \| GPIO_IN);
	354	if (request_irq(CORGI_IRQ_GPIO_KEY_SENSE(i), corgikbd_interrupt,
dace1453	355	IRQF_DISABLED \| IRQF_TRIGGER_RISING,
9ded96f2	356	"corgikbd", corgikbd))
1da177e4	357	printk(KERN_WARNING "corgikbd: Can't get IRQ: %d!\n", i);
1da177e4 LT	358	}
	359
	360	/* Set Strobe lines as outputs - set high */
	361	for (i = 0; i < CORGI_KEY_STROBE_NUM; i++)
	362	pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) \| GPIO_OUT \| GPIO_DFLT_HIGH);
	363
4872f788 RP	364	/* Setup the headphone jack as an input */
	365	pxa_gpio_mode(CORGI_GPIO_AK_INT \| GPIO_IN);
	366
1da177e4 LT	367	return 0;
	368	}
	369
3ae5eaec	370	static int corgikbd_remove(struct platform_device *pdev)
1da177e4 LT	371	{
1da177e4 LT	372	int i;
3ae5eaec	373	struct corgikbd *corgikbd = platform_get_drvdata(pdev);
1da177e4 LT	374
	375	for (i = 0; i < CORGI_KEY_SENSE_NUM; i++)
	376	free_irq(CORGI_IRQ_GPIO_KEY_SENSE(i), corgikbd);
	377
	378	del_timer_sync(&corgikbd->htimer);
	379	del_timer_sync(&corgikbd->timer);
	380
3c42f0c3	381	input_unregister_device(corgikbd->input);
1da177e4 LT	382
	383	kfree(corgikbd);
	384
	385	return 0;
	386	}
	387
3ae5eaec	388	static struct platform_driver corgikbd_driver = {
1da177e4 LT	389	.probe = corgikbd_probe,
1da177e4 LT	390	.remove = corgikbd_remove,
8240a4a4 RP	391	.suspend = corgikbd_suspend,
8240a4a4 RP	392	.resume = corgikbd_resume,
3ae5eaec RK	393	.driver = {
	394	.name = "corgi-keyboard",
	395	},
1da177e4 LT	396	};
	397
	398	static int __devinit corgikbd_init(void)
	399	{
3ae5eaec	400	return platform_driver_register(&corgikbd_driver);
1da177e4 LT	401	}
	402
	403	static void __exit corgikbd_exit(void)
	404	{
3ae5eaec	405	platform_driver_unregister(&corgikbd_driver);
1da177e4 LT	406	}
	407
	408	module_init(corgikbd_init);
	409	module_exit(corgikbd_exit);
	410
	411	MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
	412	MODULE_DESCRIPTION("Corgi Keyboard Driver");
	413	MODULE_LICENSE("GPLv2");