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主机操作系统：Centos 6.7
交叉编译器环境：arm-linux-gcc-4.5.4
开发板平台： FL2440
Linux内核版本： linux-3.0
开发模块： LED_BUTTON
邮箱：leiyuxing205@gmail.com
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kbd_device.c kbd_driver.c event_button.c kbd_driver.h Makefile
驱动相关头文件kbd_driver.h:
/***************************************************************************** * Copyright: (C) 2016 Guo Wenxue<guowenxue@aliyun.com>
* All rights reserved.
*
* Filename: kbd_driver.h
* Description: This head file is for s3c keyboard driver
*
* Version: 1.0.0(07/26/2016)
* Author: Guo Wenxue <guowenxue@aliyun.com>
* ChangeLog: 1, Release initial version on "07/26/2016 06:54:47 PM"
*
********************************************************************************/
#ifndef _KBD_DRIVER_H_
#define _KBD_DRIVER_H_
/* keyboard hardware informtation structure definition */
typedef struct s3c_kbd_info_s
{
int code; /* input device key code */
int nIRQ; /* keyboard IRQ number*/
unsigned int setting; /* keyboard IRQ Pin Setting*/
unsigned int gpio; /* keyboard GPIO port */
} s3c_kbd_info_t;
/* keyboard platform device private data structure */
typedef struct s3c_kbd_platform_data_s
{
s3c_kbd_info_t *keys;
int nkeys;
} s3c_kbd_platform_data_t;
#endif /* ----- #ifndef _KBD_DRIVER_H_ ----- */
platform_device相关驱动文件 kbd_device.c：
/********************************************************************************* * Copyright: (C) 2016 Guo Wenxue<guowenxue@aliyun.com> * All rights reserved. * * Filename: kbd_device.c * Description: This file * * Version: 1.0.0(07/26/2016) * Author: Guo Wenxue <guowenxue@aliyun.com> * ChangeLog: 1, Release initial version on "07/26/2016 05:01:25 PM" * ********************************************************************************/#include <linux/module.h>#include <linux/init.h>#include <linux/platform_device.h>#include <linux/input.h>#include <mach/hardware.h>#include <asm/gpio.h>#include <asm/irq.h>#include <mach/regs-gpio.h>#include "kbd_driver.h"static s3c_kbd_info_t s3c_kbd_gpios[] = { [0] = { .code = KEY_1, .nIRQ = IRQ_EINT0, .gpio = S3C2410_GPF(0), .setting = S3C2410_GPF0_EINT0, }, [1] = { .code = KEY_2, .nIRQ = IRQ_EINT2, .gpio = S3C2410_GPF(2), .setting = S3C2410_GPF2_EINT2, }, [2] = { .code = KEY_3, .nIRQ = IRQ_EINT3, .gpio = S3C2410_GPF(3), .setting = S3C2410_GPF3_EINT3, }, [3] = { .code = KEY_4, .nIRQ = IRQ_EINT4, .gpio = S3C2410_GPF(4), .setting = S3C2410_GPF4_EINT4, },};/* keyboard platform device private data */static s3c_kbd_platform_data_t s3c_kbd_data = { .keys = s3c_kbd_gpios, .nkeys = ARRAY_SIZE(s3c_kbd_gpios),};static void platform_kbd_release(struct device * dev){ return;}static struct platform_device s3c_keyboard_device = { .name = "s3c_kbd", .id = 1, .dev = { .platform_data = &s3c_kbd_data, .release = platform_kbd_release, },};static int __init s3c_keyboard_dev_init(void){ int rv; rv = platform_device_register(&s3c_keyboard_device); if(rv) { printk("S3C keyboard platform device register failure\n"); return rv; } printk("S3C keyboard platform device register ok\n"); return 0;}static void __exit s3c_keyboard_dev_exit(void){ printk("S3C keyboard device exit\n"); platform_device_unregister(&s3c_keyboard_device); return ;}module_init(s3c_keyboard_dev_init);module_exit(s3c_keyboard_dev_exit);MODULE_DESCRIPTION("FL2440 board keyboard input driver platform_device");MODULE_AUTHOR("Guo Wenxue<guowenxue@gmail.com>");MODULE_LICENSE("GPL");MODULE_ALIAS("platform:FL2440 keyboard device");
p latform_driver相关驱动文件 kbd_driver.c：
/********************************************************************************* * Copyright: (C) 2016 Guo Wenxue<guowenxue@aliyun.com>
* All rights reserved.
*
* Filename: kbd_driver.c
* Description: This file
*
* Version: 1.0.0(07/26/2016)
* Author: Guo Wenxue <guowenxue@aliyun.com>
* ChangeLog: 1, Release initial version on "07/26/2016 05:01:25 PM"
*
********************************************************************************/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <mach/hardware.h>
#include <asm/gpio.h>
#include <asm/irq.h>
#include <linux/slab.h>
#include <mach/regs-gpio.h>
#include "kbd_driver.h"
/* 1HZ=100*jiffies 1*jiffies=10ms => 1HZ=100*10ms = 1s */
#define CANCEL_DITHERING_DELAY (HZ/50) /* Remove button push down dithering timer delay 20ms */
typedef struct s3c_kbd_s
{
struct timer_list *timers; /* every key get a cancel dithering timer */
struct input_dev *input_dev;
s3c_kbd_platform_data_t *pdata;
} s3c_kbd_t; /*--- end of struct s3c_kbd_s ---*/
s3c_kbd_t *s3c_kbd = NULL;
static irqreturn_t s3c_kbd_intterupt(int irq, void *dev_id)
{
int i;
int found = 0;
struct platform_device *pdev = dev_id;
s3c_kbd_t *s3c_kbd = NULL;
s3c_kbd = platform_get_drvdata(pdev);
for(i=0; i<s3c_kbd->pdata->nkeys; i++)
{
if(irq == s3c_kbd->pdata->keys[i].nIRQ)
{
found = 1;
break;
}
}
if(!found) /* An ERROR interrupt */
return IRQ_NONE;
mod_timer(&s3c_kbd->timers[i], jiffies+CANCEL_DITHERING_DELAY);
return IRQ_HANDLED;
}
static void cancel_dithering_timer_handler(unsigned long data)
{
int which =(int)data;
unsigned int pinval;
pinval = s3c2410_gpio_getpin(s3c_kbd->pdata->keys[which].gpio);
if( pinval )
{
//printk("s3c_kbd key[%d] code[%d] released\n", which, s3c_kbd->pdata->keys[which].code);
input_event(s3c_kbd->input_dev, EV_KEY, s3c_kbd->pdata->keys[which].code, 0);
}
else
{
//printk("s3c_kbd key[%d] code[%d] pressed\n", which, s3c_kbd->pdata->keys[which].code);
input_event(s3c_kbd->input_dev, EV_KEY, s3c_kbd->pdata->keys[which].code, 1);
}
input_sync(s3c_kbd->input_dev);
}
static int s3c_kbd_probe(struct platform_device *pdev)
{
int i = 0;
int rv = -ENOMEM;
struct input_dev *input_dev = NULL;
s3c_kbd_platform_data_t *pdata = pdev->dev.platform_data;
/* malloc s3c_kbd struct */
s3c_kbd = kmalloc(sizeof(s3c_kbd_t), GFP_KERNEL);
if( !s3c_kbd )
{
printk("error: s3c_kbd_probe kmalloc() for s3c_kbd failure\n");
goto fail;
}
memset(s3c_kbd, 0, sizeof(s3c_kbd_t));
/* malloc cancel dithering timer for every key */
s3c_kbd->timers = (struct timer_list *) kmalloc(pdata->nkeys*sizeof(struct timer_list), GFP_KERNEL);
if( !s3c_kbd->timers )
{
printk("error: s3c_kbd_probe kmalloc() for s3c_kbd timers failure\n");
goto fail;
}
memset(s3c_kbd->timers, 0, pdata->nkeys*sizeof(struct timer_list));
/* malloc input_dev for keyboard */
input_dev=input_allocate_device();
if( !input_dev )
{
printk("error: s3c_kbd_probe input_allocate_device() failure\n");
goto fail;
}
/* setup input_dev */
input_dev->name = pdev->name;
input_dev->dev.parent = &pdev->dev;
input_dev->id.bustype = BUS_HOST;
input_dev->id.vendor = 0x0001;
input_dev->id.product = 0x0001;
input_dev->id.version = 0x0100;
set_bit(EV_KEY,input_dev->evbit);
set_bit(EV_REP,input_dev->evbit);
/* Initialize all the keys and interrupt */
for(i=0; i<pdata->nkeys; i++)
{
set_bit(pdata->keys[i].code, input_dev->keybit);
s3c2410_gpio_cfgpin(pdata->keys[i].gpio, pdata->keys[i].setting);
irq_set_irq_type(pdata->keys[i].nIRQ, IRQ_TYPE_EDGE_BOTH);
rv = request_irq(pdata->keys[i].nIRQ, s3c_kbd_intterupt, IRQF_DISABLED, pdev->name, pdev);
if( rv )
{
printk("error: request IRQ[%d] for key<%d> failure\n", pdata->keys[i].nIRQ, i);
rv = -EBUSY;
goto fail;
}
//printk("s3c_kbd request IRQ[%d] for key<%d> ok\n", pdata->keys[i].nIRQ, i);
/* Initialize all the keys cancel dithering timer */
setup_timer(&s3c_kbd->timers[i], cancel_dithering_timer_handler, i);
}
/* register input device */
rv = input_register_device(input_dev);
if( rv )
{
printk("error: s3c_kbd_probe input_register_device error!\n");
goto fail;
}
/* set s3c_kbd as private data in pdev */
s3c_kbd->input_dev = input_dev;
s3c_kbd->pdata = pdata;
platform_set_drvdata(pdev, s3c_kbd);
printk("s3c_kbd_probe ok\n");
return 0;
fail:
while(i--)
{
disable_irq(pdata->keys[i].nIRQ);
free_irq(pdata->keys[i].nIRQ, pdev);
del_timer( &s3c_kbd->timers[i] );
}
if(input_dev)
{
input_free_device(input_dev);
}
if(s3c_kbd && s3c_kbd->timers)
{
kfree(s3c_kbd->timers);
}
if(s3c_kbd)
{
kfree(s3c_kbd);
}
printk("s3c_kbd_probe failed\n");
return -ENODEV;
}
static int s3c_kbd_remove(struct platform_device *pdev)
{
int i = 0;
s3c_kbd_t *s3c_kbd = platform_get_drvdata(pdev);
for(i=0; i<s3c_kbd->pdata->nkeys; i++)
{
del_timer( &s3c_kbd->timers[i] );
disable_irq(s3c_kbd->pdata->keys[i].nIRQ);
free_irq(s3c_kbd->pdata->keys[i].nIRQ, pdev);
}
input_unregister_device(s3c_kbd->input_dev);
kfree(s3c_kbd->timers);
kfree(s3c_kbd);
printk("s3c_kbd_remove ok\n");
return 0;
}
static struct platform_driver s3c_keyboard_driver = {
.probe = s3c_kbd_probe,
.remove = s3c_kbd_remove,
.driver = {
.name = "s3c_kbd",
.owner = THIS_MODULE,
},
};
static int __init s3c_keyboard_drv_init(void)
{
int rv;
rv = platform_driver_register(&s3c_keyboard_driver);
if(rv)
{
printk("s3c keyboard platform driver register failure\n");
return rv;
}
printk("s3c keyboard platform driver register ok\n");
return 0;
}
static void __exit s3c_keyboard_drv_exit(void)
{
printk("s3c keyboard driver exit\n");
platform_driver_unregister(&s3c_keyboard_driver);
return ;
}
module_init(s3c_keyboard_drv_init);
module_exit(s3c_keyboard_drv_exit);
MODULE_DESCRIPTION("FL2440 board keyboard input driver platform_driver");
MODULE_AUTHOR("Guo Wenxue<guowenxue@gmail.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:FL2440 keyboard driver");
驱动测试文件event_button.c：
/********************************************************************************* * Copyright: (C) 2012 Guo Wenxue<Email:guowenxue@gmail.com QQ:281143292> * All rights reserved. * * Filename: event_button.c * Description: This file used to test GPIO button driver builtin Linux kernel on ARM board * * Version: 1.0.0(07/13/2012~) * Author: Guo Wenxue <guowenxue@gmail.com> * ChangeLog: 1, Release initial version on "07/13/2012 02:46:18 PM" * ********************************************************************************/#include <stdio.h>#include <unistd.h>#include <errno.h>#include <string.h>#include <stdlib.h>#include <unistd.h>#include <fcntl.h>#include <libgen.h>#include <getopt.h>#include <sys/types.h>#include <sys/ioctl.h>#include <linux/input.h>#include <linux/kd.h>#include <linux/keyboard.h>#if 0 /* Just for comment here, Reference to linux-3.3/include/linux/input.h */struct input_event { struct timeval time; __u16 type; /* 0x00:EV_SYN 0x01:EV_KEY 0x04:EV_MSC 0x11:EV_LED*/ __u16 code; /* key value, which key */ __s32 value; /* 1: Pressed 0:Not pressed 2:Always Pressed */}; #endif#define TRUE 1#define FALSE 0#define EV_RELEASED 0#define EV_PRESSED 1#define EV_REPEAT 2#define BUTTON_CNT 5#define MODE_POLL 0x01#define MODE_NORMAL 0x02void usage(char *name);void display_button_event(struct input_event *ev, int cnt);int main(int argc, char **argv){ char *kbd_dev = NULL; char kbd_name[256] = "Unknown"; int kbd_fd = -1; int rv, opt; int mode = MODE_NORMAL; int size = sizeof (struct input_event); struct input_event ev[BUTTON_CNT]; struct option long_options[] = { {"device", required_argument, NULL, 'd'}, {"poll", no_argument, NULL, 'p'}, {"help", no_argument, NULL, 'h'}, {NULL, 0, NULL, 0} }; while ((opt = getopt_long(argc, argv, "d:ph", long_options, NULL)) != -1) { switch (opt) { case 'd': kbd_dev = optarg; break; case 'p': mode = MODE_POLL; break; case 'h': usage(argv[0]); return 0; default: break; } } if(NULL == kbd_dev) { usage(argv[0]); return -1; } if ((getuid ()) != 0) printf ("You are not root! This may not work...\n"); if ((kbd_fd = open(kbd_dev, O_RDONLY)) < 0) { printf("Open %s failure: %s", kbd_dev, strerror(errno)); return -1; } ioctl (kbd_fd, EVIOCGNAME (sizeof (kbd_name)), kbd_name); printf ("Monitor input device %s (%s) event with %s mode:\n", kbd_dev, kbd_name, MODE_POLL==mode?"poll":"infilit loop");#if 0 /* Not implement in the Linux GPIO button driver */ unsigned char key_b[BUTTON_CNT/8 + 1]; memset(key_b, 0, sizeof(key_b)); if(ioctl(kbd_fd, EVIOCGKEY(sizeof(key_b)), key_b) < 0) { printf("EVIOCGKEY ioctl get error: %s\n", strerror(errno)); return -1; }#endif#if 0 /* Not implement in the Linux GPIO button driver */ /* rep[0]è?¨?¤???¨??‰é”?é???¤??????°????‰? delay????—?é—?,rep[1]è?¨?¤???‰é”?é???¤??????°????—?é—?é—?é?”?€? */ int rep[2] ={2500, 1000} ; if(ioctl(kbd_fd, EVIOCSREP, rep) < 0) { printf("EVIOCSREP ioctl get error: %s\n", strerror(errno)); return -1; } if(ioctl(kbd_fd, EVIOCGREP, rep) < 0) { printf("EVIOCGKEY ioctl get error: %s\n", strerror(errno)); return -1; } else { printf("repeate speed: [0]= %d, [1] = %d/n", rep[0], rep[1]); }#endif while (1) { if(MODE_POLL==mode) { fd_set rds; FD_ZERO(&rds); FD_SET(kbd_fd, &rds); rv = select(kbd_fd + 1, &rds, NULL, NULL, NULL); if (rv < 0) { printf("Select() system call failure: %s\n", strerror(errno)); goto CleanUp; } else if (FD_ISSET(kbd_fd, &rds)) { if ((rv = read (kbd_fd, ev, size*BUTTON_CNT )) < size) { printf("Reading data from kbd_fd failure: %s\n", strerror(errno)); break; } else { display_button_event(ev, rv/size); } } } else { if ((rv = read (kbd_fd, ev, size*BUTTON_CNT )) < size) { printf("Reading data from kbd_fd failure: %s\n", strerror(errno)); break; } else { display_button_event(ev, rv/size); } } }CleanUp: close(kbd_fd); return 0;}void usage(char *name){ char *progname = NULL; char *ptr = NULL; ptr = strdup(name); progname = basename(ptr); printf("Usage: %s [-p] -d <device>\n", progname); printf(" -d[device ] button device name\n"); printf(" -p[poll ] Use poll mode, or default use infinit loop.\n"); printf(" -h[help ] Display this help information\n"); free(ptr); return;}void display_button_event(struct input_event *ev, int cnt){ int i; struct timeval pressed_time, duration_time; for(i=0; i<cnt; i++) { //printf("type:%d code:%d value:%d\n", ev[i].type, ev[i].code, ev[i].value); if(EV_KEY==ev[i].type && EV_PRESSED==ev[i].value) { if(BTN_1 == ev[i].code) { pressed_time = ev[i].time; printf("S1 button key[%d] pressed time: %ld.%ld\n", ev[i].code, pressed_time.tv_sec, pressed_time.tv_usec); } else if(BTN_2 == ev[i].code) { pressed_time = ev[i].time; printf("S2 button key[%d] pressed time: %ld.%ld\n", ev[i].code, pressed_time.tv_sec, pressed_time.tv_usec); } else if(BTN_3 == ev[i].code) { pressed_time = ev[i].time; printf("S3 button key[%d] pressed time: %ld.%ld\n", ev[i].code, pressed_time.tv_sec, pressed_time.tv_usec); } else if(BTN_4 == ev[i].code) { pressed_time = ev[i].time; printf("S4 button key[%d] pressed time: %ld.%ld\n", ev[i].code, pressed_time.tv_sec, pressed_time.tv_usec); } else { pressed_time = ev[i].time; printf("button key[%d] pressed time: %ld.%ld\n", ev[i].code, pressed_time.tv_sec, pressed_time.tv_usec); } } if(EV_KEY==ev[i].type && EV_RELEASED==ev[i].value) { if(BTN_1 == ev[i].code) { timersub(&ev[i].time, &pressed_time, &duration_time); printf("S1 button key[%d] released time: %ld.%ld\n", ev[i].code, ev[i].time.tv_sec, ev[i].time.tv_usec); printf("S1 button key[%d] duration time: %ld.%ld\n", ev[i].code, duration_time.tv_sec, duration_time.tv_usec); } else if(BTN_2 == ev[i].code) { timersub(&ev[i].time, &pressed_time, &duration_time); printf("S2 button key[%d] released time: %ld.%ld\n", ev[i].code, ev[i].time.tv_sec, ev[i].time.tv_usec); printf("S2 button key[%d] duration time: %ld.%ld\n", ev[i].code, duration_time.tv_sec, duration_time.tv_usec); } else if(BTN_3 == ev[i].code) { timersub(&ev[i].time, &pressed_time, &duration_time); printf("S3 button key[%d] released time: %ld.%ld\n", ev[i].code, ev[i].time.tv_sec, ev[i].time.tv_usec); printf("S3 button key[%d] duration time: %ld.%ld\n", ev[i].code, duration_time.tv_sec, duration_time.tv_usec); } else if(BTN_4 == ev[i].code) { timersub(&ev[i].time, &pressed_time, &duration_time); printf("S4 button key[%d] released time: %ld.%ld\n", ev[i].code, ev[i].time.tv_sec, ev[i].time.tv_usec); printf("S4 button key[%d] duration time: %ld.%ld\n", ev[i].code, duration_time.tv_sec, duration_time.tv_usec); } else { timersub(&ev[i].time, &pressed_time, &duration_time); printf("button key[%d] released time: %ld.%ld\n", ev[i].code, ev[i].time.tv_sec, ev[i].time.tv_usec); printf("button key[%d] duration time: %ld.%ld\n", ev[i].code, duration_time.tv_sec, duration_time.tv_usec); } } } /* for(i=0; i<cnt; i++) */}
驱动和测试程序编译Makefile文件
TEST_APP=event_buttonKERNEL_VER = linux-3.0LINUX_SRC ?= /home/leiyuxing/fl2440/kernel/$(KERNEL_VER)CROSS_COMPILE=/opt/buildroot-2012.08/arm920t/usr/bin/arm-linux-PWD := $(shell pwd)obj-m += kbd_device.oobj-m += kbd_driver.omodules: @make -C $(LINUX_SRC) M=$(PWD) modules @make clear @chmod a+x *.ko && cp *.ko /tftp @make testappclear: @rm -f *.o *.cmd *.mod.c @rm -rf *~ core .depend .tmp_versions Module.symvers modules.order -f @rm -f .*ko.cmd .*.o.cmd .*.o.dclean: clear @rm -f *.ko ${TEST_APP}testapp: ${CROSS_COMPILE}gcc ${TEST_APP}.c -o ${TEST_APP}
[leiyuxing@centos6 input_kbd]$ make
make[1]: Entering directory `/home/leiyuxing/fl2440/kernel/linux-3.0'
CC [M] /home/leiyuxing/fl2440/kernel/linux-3.0/input_dev/input_kbd/kbd_device.o
CC [M] /home/leiyuxing/fl2440/kernel/linux-3.0/input_dev/input_kbd/kbd_driver.o
Building modules, stage 2.
MODPOST 2 modules
CC /home/leiyuxing/fl2440/kernel/linux-3.0/input_dev/input_kbd/kbd_device.mod.o
LD [M] /home/leiyuxing/fl2440/kernel/linux-3.0/input_dev/input_kbd/kbd_device.ko
CC /home/leiyuxing/fl2440/kernel/linux-3.0/input_dev/input_kbd/kbd_driver.mod.o
LD [M] /home/leiyuxing/fl2440/kernel/linux-3.0/input_dev/input_kbd/kbd_driver.ko
make[1]: Leaving directory `/home/leiyuxing/fl2440/kernel/linux-3.0'
make[1]: Entering directory `/home/leiyuxing/fl2440/kernel/linux-3.0/input_dev/input_kbd'
make[1]: Leaving directory `/home/leiyuxing/fl2440/kernel/linux-3.0/input_dev/input_kbd'
[leiyuxing@centos6 input_kbd]$ ls
kbd_device.c kbd_driver.c kbd_driver.ko
event_button.c kbd_device.ko kbd_driver.h Makefile
[leiyuxing@centos6input_kbd]$/opt/buildroot-2012.08/arm920t/usr/bin/arm-linux-gcc
event_button.c
[leiyuxing@centos6 input_kbd]$ ls
a.out kbd_device.c kbd_driver.c kbd_driver.ko
event_button.c kbd_device.ko kbd_driver.h Makefile
在开发板上的操作:
下载设备驱动：
>: tftp -gr kbd_device.ko 192.168.1.2
kbd_device.ko 100% |*******************************| 3358 0:00:00 ETA
>: tftp -gr kbd_driver.ko 192.168.1.2
kbd_driver.ko 100% |*******************************| 5996 0:00:00 ETA
运行测试：
>: insmod kbd_device.ko
S3C keyboard platform device register ok
>: insmod kbd_driver.ko
input: s3c_kbd as /devices/platform/s3c_kbd.1/input/input0
s3c_kbd_probe ok
s3c keyboard platform driver register ok
使用测试程序a.out分别测试4个按键：
>: ./a.out
Usage: a.out [-p] -d <device>
-d[device ] button device name
-p[poll ] Use poll mode, or default use infinit loop.
-h[help ] Display this help information
>: ./a.out -p -d /dev/event0
Monitor input device /dev/event0 (s3c_kbd) event with poll mode:
Monitor input device /dev/event0 (s3c_kbd) event with poll mode:
button key[2] pressed time: 483.320105
button key[2] released time: 483.500073
button key[2] duration time: 1094956827.500065
button key[3] pressed time: 485.265110
button key[3] released time: 485.520131
button key[3] duration time: 1094956829.520123
button key[4] pressed time: 487.815109
button key[4] released time: 488.60077
button key[4] duration time: 1094956832.60069
经测试发现我的按键4坏了故无法显示。