drivers/input/keyboard/locomokbd.c - kernel/msm-4.9 - Gitiles

 /*
  *  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/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_F15

 static 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	1

 struct 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);

 	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;
 	struct input_dev *input_dev;
 	int i, ret;

 	locomokbd = kzalloc(sizeof(struct locomokbd), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!locomokbd || !input_dev) {
 		ret = -ENOMEM;
 		goto free;
 	}

 	/* 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 = input_dev;
 	strcpy(locomokbd->phys, "locomokbd/input0");

 	input_dev->name = "LoCoMo keyboard";
 	input_dev->phys = locomokbd->phys;
 	input_dev->id.bustype = BUS_HOST;
 	input_dev->id.vendor = 0x0001;
 	input_dev->id.product = 0x0001;
 	input_dev->id.version = 0x0100;
 	input_dev->private = locomokbd;

 	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP);
 	input_dev->keycode = locomokbd->keycode;
 	input_dev->keycodesize = sizeof(unsigned char);
 	input_dev->keycodemax = ARRAY_SIZE(locomokbd_keycode);

 	memcpy(locomokbd->keycode, locomokbd_keycode, sizeof(locomokbd->keycode));
 	for (i = 0; i < LOCOMOKBD_NUMKEYS; i++)
 		set_bit(locomokbd->keycode[i], input_dev->keybit);
 	clear_bit(0, input_dev->keybit);

 	/* 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);

 	return 0;

 out:
 	release_mem_region((unsigned long) dev->mapbase, dev->length);
 	locomo_set_drvdata(dev, NULL);
 free:
 	input_free_device(input_dev);
 	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);
	/*
	* 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/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_F15

	static 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 1

	struct 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);

	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;
	struct input_dev *input_dev;
	int i, ret;

	locomokbd = kzalloc(sizeof(struct locomokbd), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!locomokbd \|\| !input_dev) {
	ret = -ENOMEM;
	goto free;
	}

	/* 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 = input_dev;
	strcpy(locomokbd->phys, "locomokbd/input0");

	input_dev->name = "LoCoMo keyboard";
	input_dev->phys = locomokbd->phys;
	input_dev->id.bustype = BUS_HOST;
	input_dev->id.vendor = 0x0001;
	input_dev->id.product = 0x0001;
	input_dev->id.version = 0x0100;
	input_dev->private = locomokbd;

	input_dev->evbit[0] = BIT(EV_KEY) \| BIT(EV_REP);
	input_dev->keycode = locomokbd->keycode;
	input_dev->keycodesize = sizeof(unsigned char);
	input_dev->keycodemax = ARRAY_SIZE(locomokbd_keycode);

	memcpy(locomokbd->keycode, locomokbd_keycode, sizeof(locomokbd->keycode));
	for (i = 0; i < LOCOMOKBD_NUMKEYS; i++)
	set_bit(locomokbd->keycode[i], input_dev->keybit);
	clear_bit(0, input_dev->keybit);

	/* 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);

	return 0;

	out:
	release_mem_region((unsigned long) dev->mapbase, dev->length);
	locomo_set_drvdata(dev, NULL);
	free:
	input_free_device(input_dev);
	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);