OK6410矩阵键盘驱动 linux2.6.36

搞了好几天，终于在网络资料的帮助下，实现了4*4的矩阵键盘驱动，

参考文档：http://blog.csdn.net/xyl_nuaa/article/details/7047897 及相关网友评论

需要注明一点的是：

void samsung_keypad_cfg_gpio(unsigned int rows, unsigned int cols)函数的位置：

arch/arm/mach-s3c64xx/setup-keypad.c 修改方法如下：

voidsamsung_keypad_cfg_gpio(unsigned int rows, unsigned int cols)

{

unsignedint gpio;

unsignedint end;




/*Set all the necessary GPK pins to special-function 3: KP_ROW[x] */

end= S3C64XX_GPK(8 + rows);

for(gpio = S3C64XX_GPK(8); gpio < end; gpio++) {

s3c_gpio_cfgpin(gpio,S3C_GPIO_SFN(3));

s3c_gpio_setpull(gpio,S3C_GPIO_PULL_NONE);

}



/*Set all the necessary GPL pins to special-function 3: KP_COL[x] */

end= S3C64XX_GPL(0 + cols);

for(gpio = S3C64XX_GPL(0); gpio < end; gpio++) {

s3c_gpio_cfgpin(gpio,S3C_GPIO_SFN(3));

s3c_gpio_setpull(gpio,S3C_GPIO_PULL_NONE);

}

}

其中S3C_GPIO_PULL_NONE需要改成S3C_GPIO_PULL_UP

 

此外，还需要修改一点，代码原先为2*8的矩阵键盘，需修改为4*4的矩阵键盘

在arch/arm/mach-s3c64xx/mach-smdk6410.c中，在380行中修改为如下：

static struct samsung_keypad_platdata smdk6410_keypad_data _initdata={

          .keymap_data = & smdk6410_keymap_data,

          .rows  =  4,

          .cols    = 4,

};

 

呵呵，整个代码如下：

samsung-keypad,c :

/*
 * Samsung keypad driver
 *
 * Copyright (C) 2010 Samsung Electronics Co.Ltd
 * Author: Joonyoung Shim <[e-mail]>
 * Author: Donghwa Lee <[e-mail]>
 *
 * 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.
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <plat/keypad.h>

#define SAMSUNG_KEYIFCON0x00
#define SAMSUNG_KEYIFSTSCLR0x04
#define SAMSUNG_KEYIFCOL0x08
#define SAMSUNG_KEYIFROW0x0c
#define SAMSUNG_KEYIFFC0x10

/* SAMSUNG_KEYIFCON */
#define SAMSUNG_KEYIFCON_INT_F_EN(1 << 0)
#define SAMSUNG_KEYIFCON_INT_R_EN(1 << 1)
#define SAMSUNG_KEYIFCON_DF_EN(1 << 2)
#define SAMSUNG_KEYIFCON_FC_EN(1 << 3)
#define SAMSUNG_KEYIFCON_WAKEUPEN(1 << 4)

/* SAMSUNG_KEYIFSTSCLR */
#define SAMSUNG_KEYIFSTSCLR_P_INT_MASK(0xff << 0)
#define SAMSUNG_KEYIFSTSCLR_R_INT_MASK(0xff << 8)
#define SAMSUNG_KEYIFSTSCLR_R_INT_OFFSET8
#define S5PV210_KEYIFSTSCLR_P_INT_MASK(0x3fff << 0)
#define S5PV210_KEYIFSTSCLR_R_INT_MASK(0x3fff << 16)
#define S5PV210_KEYIFSTSCLR_R_INT_OFFSET16

/* SAMSUNG_KEYIFCOL */
#define SAMSUNG_KEYIFCOL_MASK(0xff << 0)
#define S5PV210_KEYIFCOLEN_MASK(0xff << 8)

unsigned int keypad_keycode[] = {'1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G'};

/* SAMSUNG_KEYIFROW */
#define SAMSUNG_KEYIFROW_MASK(0xff << 0)
#define S5PV210_KEYIFROW_MASK(0x3fff << 0)

/* SAMSUNG_KEYIFFC */
#define SAMSUNG_KEYIFFC_MASK(0x3ff << 0)



enum samsung_keypad_type {
KEYPAD_TYPE_SAMSUNG,
KEYPAD_TYPE_S5PV210,
};

struct samsung_keypad {
struct input_dev *input_dev;
struct clk *clk;
void __iomem *base;
wait_queue_head_t wait;
bool stopped;
int irq;
unsigned int row_shift;
unsigned int rows;
unsigned int cols;
unsigned int row_state[SAMSUNG_MAX_COLS];
unsigned short keycodes[];
};

static int samsung_keypad_is_s5pv210(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
enum samsung_keypad_type type =
platform_get_device_id(pdev)->driver_data;

return type == KEYPAD_TYPE_S5PV210;
}

static void samsung_keypad_scan(struct samsung_keypad *keypad,
unsigned int *row_state)
{
//struct device *dev = keypad->input_dev->dev.parent;
unsigned int col;
unsigned int val;

//printk("<0>samsung_keypad_scan!\n");

for (col = 0; col < keypad->cols; col++) {
/*if (samsung_keypad_is_s5pv210(dev)) {
val = S5PV210_KEYIFCOLEN_MASK;
val &= ~(1 << col) << 8;
} else {*/
val = SAMSUNG_KEYIFCOL_MASK;
val &= ~(1 << col);
//}

writel(val, keypad->base + SAMSUNG_KEYIFCOL);
mdelay(1);

val = readl(keypad->base + SAMSUNG_KEYIFROW);
row_state[col] = ~val & ((1 << keypad->rows) - 1);
}

/* KEYIFCOL reg clear */
writel(0, keypad->base + SAMSUNG_KEYIFCOL);
}

static bool samsung_keypad_report(struct samsung_keypad *keypad,
  unsigned int *row_state)
{
struct input_dev *input_dev = keypad->input_dev;
unsigned int changed;
unsigned int pressed;
unsigned int key_down = 0;
unsigned int val;
unsigned int col, row;


for (col = 0; col < keypad->cols; col++) {
changed = row_state[col] ^ keypad->row_state[col];
key_down |= row_state[col];
if (!changed)
continue;

for (row = 0; row < keypad->rows; row++) {
if (!(changed & (1 << row)))
continue;

pressed = row_state[col] & (1 << row);

printk("\n<0>samsung_keypad key %s,row:%d,col:%d\n"
                       ,(pressed ? "pressed":"released"),row,col );

dev_dbg(&keypad->input_dev->dev,
"key %s, row: %d, col: %d\n",
pressed ? "pressed" : "released", row, col);

val = MATRIX_SCAN_CODE(row, col, keypad->row_shift);

input_event(input_dev, EV_MSC, MSC_SCAN, val);
input_report_key(input_dev,
keypad->keycodes[val], pressed);
}
input_sync(keypad->input_dev);
}

memcpy(keypad->row_state, row_state, sizeof(keypad->row_state));

return key_down;
}

static irqreturn_t samsung_keypad_irq(int irq, void *dev_id)
{
struct samsung_keypad *keypad = dev_id;
unsigned int row_state[SAMSUNG_MAX_COLS];
unsigned int val;
bool key_down;

do {
val = readl(keypad->base + SAMSUNG_KEYIFSTSCLR);
/* Clear interrupt. */
writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);

samsung_keypad_scan(keypad, row_state);

key_down = samsung_keypad_report(keypad, row_state);
if (key_down)
wait_event_timeout(keypad->wait, keypad->stopped,
   msecs_to_jiffies(50));

} while (key_down && !keypad->stopped);

return IRQ_HANDLED;
}

static void samsung_keypad_start(struct samsung_keypad *keypad)
{
unsigned int val;

/* Tell IRQ thread that it may poll the device. */
keypad->stopped = false;

clk_enable(keypad->clk);

/* Enable interrupt bits. */
val = readl(keypad->base + SAMSUNG_KEYIFCON);
val |= SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN;
writel(val, keypad->base + SAMSUNG_KEYIFCON);

/* KEYIFCOL reg clear. */
writel(0, keypad->base + SAMSUNG_KEYIFCOL);
}

static void samsung_keypad_stop(struct samsung_keypad *keypad)
{
unsigned int val;

/* Signal IRQ thread to stop polling and disable the handler. */
keypad->stopped = true;
wake_up(&keypad->wait);
disable_irq(keypad->irq);

/* Clear interrupt. */
writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);

/* Disable interrupt bits. */
val = readl(keypad->base + SAMSUNG_KEYIFCON);
val &= ~(SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN);
writel(val, keypad->base + SAMSUNG_KEYIFCON);

clk_disable(keypad->clk);

/*
 * Now that chip should not generate interrupts we can safely
 * re-enable the handler.
 */
enable_irq(keypad->irq);
}

static int samsung_keypad_open(struct input_dev *input_dev)
{
printk("<0>samsung_keypad_open!\n");
struct samsung_keypad *keypad = input_get_drvdata(input_dev);

samsung_keypad_start(keypad);

return 0;
}

static void samsung_keypad_close(struct input_dev *input_dev)
{
struct samsung_keypad *keypad = input_get_drvdata(input_dev);

samsung_keypad_stop(keypad);
}

static int __devinit samsung_keypad_probe(struct platform_device *pdev)
{
const struct samsung_keypad_platdata *pdata;
const struct matrix_keymap_data *keymap_data;
struct samsung_keypad *keypad;
struct resource *res;
struct input_dev *input_dev;
unsigned int row_shift;
unsigned int keymap_size;
int error;

unsigned int key=0;
unsigned int keycodes_size=sizeof(keypad_keycode)/sizeof(keypad_keycode[0]);

printk("<0>samsung_keypad_probe!\n");

pdata = pdev->dev.platform_data;
if (!pdata) {
dev_err(&pdev->dev, "no platform data defined\n");
return -EINVAL;
}

keymap_data = pdata->keymap_data;
if (!keymap_data) {
dev_err(&pdev->dev, "no keymap data defined\n");
return -EINVAL;
}

if (!pdata->rows || pdata->rows > SAMSUNG_MAX_ROWS)
return -EINVAL;

if (!pdata->cols || pdata->cols > SAMSUNG_MAX_COLS)
return -EINVAL;

/* initialize the gpio */
if (pdata->cfg_gpio)
pdata->cfg_gpio(pdata->rows, pdata->cols);

row_shift = get_count_order(pdata->cols);
keymap_size = (pdata->rows << row_shift) * sizeof(keypad->keycodes[0]);

keypad = kzalloc(sizeof(*keypad) + keymap_size, GFP_KERNEL);
input_dev = input_allocate_device();
if (!keypad || !input_dev) {
error = -ENOMEM;
goto err_free_mem;
}

res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
error = -ENODEV;
goto err_free_mem;
}

keypad->base = ioremap(res->start, resource_size(res));
if (!keypad->base) {
error = -EBUSY;
goto err_free_mem;
}

keypad->clk = clk_get(&pdev->dev, "keypad");
if (IS_ERR(keypad->clk)) {
dev_err(&pdev->dev, "failed to get keypad clk\n");
error = PTR_ERR(keypad->clk);
goto err_unmap_base;
}

keypad->input_dev = input_dev;
keypad->row_shift = row_shift;
keypad->rows = pdata->rows;
keypad->cols = pdata->cols;
init_waitqueue_head(&keypad->wait);

input_dev->name = pdev->name;
input_dev->id.bustype = BUS_HOST;
input_dev->dev.parent = &pdev->dev;
input_set_drvdata(input_dev, keypad);

input_dev->open = samsung_keypad_open;
input_dev->close = samsung_keypad_close;

input_dev->evbit[0] = BIT_MASK(EV_KEY);
if (!pdata->no_autorepeat)
input_dev->evbit[0] |= BIT_MASK(EV_REP);

input_set_capability(input_dev, EV_MSC, MSC_SCAN);

input_dev->keycode = keypad->keycodes;
input_dev->keycodesize = sizeof(keypad->keycodes[0]);
input_dev->keycodemax = pdata->rows << row_shift;

/*matrix_keypad_build_keymap(keymap_data, row_shift,
input_dev->keycode, input_dev->keybit);*/
        for(key=0;key<keycodes_size;key++){
int code=keypad->keycodes[key]=keypad_keycode[key];
if(code<=0)
continue;
__set_bit(code,input_dev->keybit);
}
__clear_bit(0,input_dev->keybit);

keypad->irq = platform_get_irq(pdev, 0);
if (keypad->irq < 0) {
error = keypad->irq;
goto err_put_clk;
}

error = request_threaded_irq(keypad->irq, NULL, samsung_keypad_irq,
IRQF_ONESHOT, dev_name(&pdev->dev), keypad);
if (error) {
dev_err(&pdev->dev, "failed to register keypad interrupt\n");
goto err_put_clk;
}

error = input_register_device(keypad->input_dev);
if (error)
goto err_free_irq;

device_init_wakeup(&pdev->dev, pdata->wakeup);
platform_set_drvdata(pdev, keypad);
return 0;

err_free_irq:
free_irq(keypad->irq, keypad);
err_put_clk:
clk_put(keypad->clk);
err_unmap_base:
iounmap(keypad->base);
err_free_mem:
input_free_device(input_dev);
kfree(keypad);

return error;
}

static int __devexit samsung_keypad_remove(struct platform_device *pdev)
{
struct samsung_keypad *keypad = platform_get_drvdata(pdev);

device_init_wakeup(&pdev->dev, 0);
platform_set_drvdata(pdev, NULL);

input_unregister_device(keypad->input_dev);

/*
 * It is safe to free IRQ after unregistering device because
 * samsung_keypad_close will shut off interrupts.
 */
free_irq(keypad->irq, keypad);

clk_put(keypad->clk);

iounmap(keypad->base);
kfree(keypad);

return 0;
}

#ifdef CONFIG_PM
static void samsung_keypad_toggle_wakeup(struct samsung_keypad *keypad,
 bool enable)
{
struct device *dev = keypad->input_dev->dev.parent;
unsigned int val;

clk_enable(keypad->clk);

val = readl(keypad->base + SAMSUNG_KEYIFCON);
if (enable) {
val |= SAMSUNG_KEYIFCON_WAKEUPEN;
if (device_may_wakeup(dev))
enable_irq_wake(keypad->irq);
} else {
val &= ~SAMSUNG_KEYIFCON_WAKEUPEN;
if (device_may_wakeup(dev))
disable_irq_wake(keypad->irq);
}
writel(val, keypad->base + SAMSUNG_KEYIFCON);

clk_disable(keypad->clk);
}

static int samsung_keypad_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct samsung_keypad *keypad = platform_get_drvdata(pdev);
struct input_dev *input_dev = keypad->input_dev;

mutex_lock(&input_dev->mutex);

if (input_dev->users)
samsung_keypad_stop(keypad);

samsung_keypad_toggle_wakeup(keypad, true);

mutex_unlock(&input_dev->mutex);

return 0;
}

static int samsung_keypad_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct samsung_keypad *keypad = platform_get_drvdata(pdev);
struct input_dev *input_dev = keypad->input_dev;

mutex_lock(&input_dev->mutex);

samsung_keypad_toggle_wakeup(keypad, false);

if (input_dev->users)
samsung_keypad_start(keypad);

mutex_unlock(&input_dev->mutex);

return 0;
}

static const struct dev_pm_ops samsung_keypad_pm_ops = {
.suspend= samsung_keypad_suspend,
.resume= samsung_keypad_resume,
};
#endif

static struct platform_device_id samsung_keypad_driver_ids[] = {
{
.name= "samsung-keypad",
.driver_data= KEYPAD_TYPE_SAMSUNG,
}, {
.name= "s5pv210-keypad",
.driver_data= KEYPAD_TYPE_S5PV210,
},
{ },
};
MODULE_DEVICE_TABLE(platform, samsung_keypad_driver_ids);

static struct platform_driver samsung_keypad_driver = {
.probe= samsung_keypad_probe,
.remove= __devexit_p(samsung_keypad_remove),
.driver= {
.name= "samsung-keypad",
.owner= THIS_MODULE,
#ifdef CONFIG_PM
.pm= &samsung_keypad_pm_ops,
#endif
},
.id_table= samsung_keypad_driver_ids,
};

static int __init samsung_keypad_init(void)
{
printk("<0>adc_drv_open and adc_init()\n");
return platform_driver_register(&samsung_keypad_driver);
}
module_init(samsung_keypad_init);

static void __exit samsung_keypad_exit(void)
{
platform_driver_unregister(&samsung_keypad_driver);
}
module_exit(samsung_keypad_exit);

MODULE_AUTHOR("Joonyoung Shim <[e-mail]>");
MODULE_AUTHOR("Donghwa Lee <[e-mail]>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:samsung-keypad");

 

应用程序：

key.c

 

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/select.h>
#include <sys/time.h>
#include <errno.h>
#include <linux/input.h> 
int main(void)
{
 int fd;
 int key_value,i=0,count; 
 struct input_event ev_key;
 fd = open("/dev/input/event2", 666);
 if (fd < 0) 
 {
  perror("open device buttons");
  exit(1);
 } 
 for (;;) 
 {
  count = read(fd,&ev_key,sizeof(struct input_event)); 
  for(i=0; i<(int)count/sizeof(struct input_event); i++)
  if(EV_KEY==ev_key.type)
   printf("type:%d,code:%c,value:%d\n", ev_key.type,ev_key.code,ev_key.value); 
//  if(EV_SYN==ev_key.type)
//   printf("syn event\n\n");
 } 
 close(fd);
 return 0;
}

Makefile:

 

ifneq ($(KERNELRELEASE),)  
obj-m := samsung-keypad.o  
else  
KDIR := /home/ok6410/linux2.6.36/linux-2.6.36.2-v1.05 

all:  
make -C $(KDIR) M=$(PWD) ARCH=arm CROSS_COMPILE=arm-linux-  
clean:  
rm -f *.ko *.o *.mod.o *.mod.c *.symvers  
endif