TA的每日心情 | 擦汗 3 小时前 |
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签到天数: 526 天 连续签到: 3 天 [LV.9]测试副司令
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示例一:
1、驱动代码
- #include <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/fs.h>
- #include <linux/init.h>
- #include <linux/delay.h>
- #include <linux/platform_device.h>
- #include <linux/cdev.h>
- #include <linux/miscdevice.h>
- #include <linux/sched.h>
- #include <linux/gpio.h>
- #define DEVICE_NAME "buttons"
- struct button_irq_desc {
- int irq;
- int pin;
- int pin_setting;
- int number;
- char *name;
- };
- static struct button_irq_desc button_irqs [] = {
- {IRQ_EINT8 , S3C2410_GPG(0) , S3C2410_GPG0_EINT8 , 0, "KEY0"},
- {IRQ_EINT11, S3C2410_GPG(3) , S3C2410_GPG3_EINT11 , 1, "KEY1"},
- {IRQ_EINT13, S3C2410_GPG(5) , S3C2410_GPG5_EINT13 , 2, "KEY2"},
- {IRQ_EINT14, S3C2410_GPG(6) , S3C2410_GPG6_EINT14 , 3, "KEY3"},
- {IRQ_EINT15, S3C2410_GPG(7) , S3C2410_GPG7_EINT15 , 4, "KEY4"},
- {IRQ_EINT19, S3C2410_GPG(11), S3C2410_GPG11_EINT19, 5, "KEY5"},
- };
- static volatile char key_values [] = {'0', '0', '0', '0', '0', '0'};
- static DECLARE_WAIT_QUEUE_HEAD(button_waitq);
- static volatile int ev_press = 0;
- static irqreturn_t buttons_interrupt(int irq, void *dev_id)
- {
- struct button_irq_desc *button_irqs = (struct button_irq_desc *)dev_id;
- int down;
- // udelay(0);
- down = !s3c2410_gpio_getpin(button_irqs->pin);
- if (down != (key_values[button_irqs->number] & 1)) { // Changed
- key_values[button_irqs->number] = '0' + down;
- ev_press = 1;
- wake_up_interruptible(&button_waitq);
- }
- return IRQ_RETVAL(IRQ_HANDLED);
- }
- static int s3c24xx_buttons_open(struct inode *inode, struct file *file)
- {
- int i;
- int err = 0;
- for (i = 0; i < sizeof(button_irqs)/sizeof(button_irqs[0]); i++) {
- if (button_irqs[i].irq < 0) {
- continue;
- }
- err = request_irq(button_irqs[i].irq, buttons_interrupt, IRQ_TYPE_EDGE_BOTH,
- button_irqs[i].name, (void *)&button_irqs[i]);
- if (err)
- break;
- }
- if (err) {
- i--;
- for (; i >= 0; i--) {
- if (button_irqs[i].irq < 0) {
- continue;
- }
- disable_irq(button_irqs[i].irq);
- free_irq(button_irqs[i].irq, (void *)&button_irqs[i]);
- }
- return -EBUSY;
- }
- ev_press = 1;
- return 0;
- }
- static int s3c24xx_buttons_close(struct inode *inode, struct file *file)
- {
- int i;
- for (i = 0; i < sizeof(button_irqs)/sizeof(button_irqs[0]); i++) {
- if (button_irqs[i].irq < 0) {
- continue;
- }
- free_irq(button_irqs[i].irq, (void *)&button_irqs[i]);
- }
- return 0;
- }
- static int s3c24xx_buttons_read(struct file *filp, char __user *buff, size_t count, loff_t *offp)
- {
- unsigned long err;
- if (!ev_press) {
- if (filp->f_flags & O_NONBLOCK)
- return -EAGAIN;
- else
- wait_event_interruptible(button_waitq, ev_press);
- }
- ev_press = 0;
- err = copy_to_user(buff, (const void *)key_values, min(sizeof(key_values), count));
- return err ? -EFAULT : min(sizeof(key_values), count);
- }
- static unsigned int s3c24xx_buttons_poll( struct file *file, struct poll_table_struct *wait)
- {
- unsigned int mask = 0;
- poll_wait(file, &button_waitq, wait);
- if (ev_press)
- mask |= POLLIN | POLLRDNORM;
- return mask;
- }
- static struct file_operations dev_fops = {
- .owner = THIS_MODULE,
- .open = s3c24xx_buttons_open,
- .release = s3c24xx_buttons_close,
- .read = s3c24xx_buttons_read,
- .poll = s3c24xx_buttons_poll,
- };
- static int __init dev_init(void)
- {
- int ret;
- ret = misc_register(&misc);
- printk (DEVICE_NAME"\tinitialized\n");
- return ret;
- }
- static void __exit dev_exit(void)
- {
- misc_deregister(&misc);
- }
- module_init(dev_init);
- module_exit(dev_exit);
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("FriendlyARM Inc.");
复制代码2、测试代码
- #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>
- int main(void)
- {
- int buttons_fd;
- char buttons[6] = {'0', '0', '0', '0', '0', '0'};
- for (;;) {
- char current_buttons[6];
- int count_of_changed_key;
- int i;
- if (read(buttons_fd, current_buttons, sizeof current_buttons) != sizeof current_buttons) {
- perror("read buttons:");
- exit(1);
- }
- printf("%skey %d is %s", count_of_changed_key? ", ": "", i+1, buttons[i] == '0' ? "up" : "down");
- count_of_changed_key++;
- }
- }
- if (count_of_changed_key) {
- printf("\n");
- }
- }
- close(buttons_fd);
- return 0;
- }
复制代码示例二:
1、驱动程序
- #include <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/fs.h>
- #include <linux/init.h>
- #include <linux/delay.h>
- #include <linux/poll.h>
- #include <linux/irq.h>
- #include <asm/irq.h>
- #include <linux/interrupt.h>
- #include <asm/uaccess.h>
- #include <linux/miscdevice.h>
- #include <linux/sched.h>
- #include <linux/gpio.h>
- #define DEVICE_NAME "buttons2"
- struct button_irq_desc {
- int irq;
- int pin;
- int number;
- char *name;
- };
- static struct button_irq_desc button_irqs [] = {
- {IRQ_EINT8 , S3C2410_GPG(0) , 0, "KEY0"},
- {IRQ_EINT11, S3C2410_GPG(3) , 1, "KEY1"},
- {IRQ_EINT13, S3C2410_GPG(5) , 2, "KEY2"},
- {IRQ_EINT14, S3C2410_GPG(6) , 3, "KEY3"},
- {IRQ_EINT15, S3C2410_GPG(7) , 4, "KEY4"},
- {IRQ_EINT19, S3C2410_GPG(11), 5, "KEY5"},
- };
- static volatile int key_values [] = {0, 0, 0, 0, 0, 0, 0};
- static DECLARE_WAIT_QUEUE_HEAD(button_waitq);
- static volatile int ev_press = 0;
- static irqreturn_t buttons_interrupt(int irq, void *dev_id)
- {
- struct button_irq_desc *button_irqs = (struct button_irq_desc *)dev_id;
- int down;
- // udelay(0);
- down = !s3c2410_gpio_getpin(button_irqs->pin);
- if (down) { // Changed
- key_values[button_irqs->number + 1] = key_values[button_irqs->number + 1] + 1;
- key_values[0] = key_values[0] + 1;
- ev_press = 1;
- wake_up_interruptible(&button_waitq);
- }
- return IRQ_RETVAL(IRQ_HANDLED);
- }
- static int s3c24xx_buttons_open(struct inode *inode, struct file *file)
- {
- int i;
- int err = 0;
- if (err) {
- i--;
- for (; i >= 0; i--) {
- if (button_irqs[i].irq < 0) {
- continue;
- }
- disable_irq(button_irqs[i].irq);
- free_irq(button_irqs[i].irq, (void *)&button_irqs[i]);
- }
- return -EBUSY;
- }
- ev_press = 1;
- return 0;
- }
- static int s3c24xx_buttons_close(struct inode *inode, struct file *file)
- {
- int i;
- for (i = 0; i < sizeof(button_irqs)/sizeof(button_irqs[0]); i++) {
- if (button_irqs[i].irq < 0) {
- continue;
- }
- free_irq(button_irqs[i].irq, (void *)&button_irqs[i]);
- }
- return 0;
- }
- static int s3c24xx_buttons_read(struct file *filp, char __user *buff, size_t count, loff_t *offp)
- {
- unsigned long err;
- if (!ev_press) {
- if (filp->f_flags & O_NONBLOCK)
- return -EAGAIN;
- else
- wait_event_interruptible(button_waitq, ev_press);
- }
- ev_press = 0;
- err = copy_to_user(buff, (const void *)key_values, min(sizeof(key_values), count));
- return err ? -EFAULT : min(sizeof(key_values), count);
- }
- static unsigned int s3c24xx_buttons_poll( struct file *file, struct poll_table_struct *wait)
- {
- unsigned int mask = 0;
- poll_wait(file, &button_waitq, wait);
- if (ev_press)
- mask |= POLLIN | POLLRDNORM;
- return mask;
- }
- static struct file_operations dev_fops = {
- .owner = THIS_MODULE,
- .open = s3c24xx_buttons_open,
- .release = s3c24xx_buttons_close,
- .read = s3c24xx_buttons_read,
- .poll = s3c24xx_buttons_poll,
- };
- static struct miscdevice misc = {
- .minor = MISC_DYNAMIC_MINOR,
- .name = DEVICE_NAME,
- .fops = &dev_fops,
- };
- static int __init dev_init(void)
- {
- int ret;
- ret = misc_register(&misc);
- printk (DEVICE_NAME"\tinitialized\n");
- return ret;
- }
- static void __exit dev_exit(void)
- {
- misc_deregister(&misc);
- }
- module_init(dev_init);
- module_exit(dev_exit);
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("FriendlyARM Inc.");
复制代码2、测试程序 - <p style="box-sizing: inherit; margin-top: 16px; margin-bottom: 14px; line-height: 28px;">#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>
- int main(void)
- {
- int buttons_fd;
- int total_buttons_click = 0;
- buttons_fd = open("/dev/buttons2", 0);
- if (buttons_fd < 0) {
- perror("open device buttons");
- exit(1);
- }
- int i;
- if (read(buttons_fd, current_buttons, sizeof current_buttons) != sizeof current_buttons) {
- perror("read buttons:");
- exit(1);
- }
- if (total_buttons_click < current_buttons[0]) {
- total_buttons_click = current_buttons[0];
- printf("total: %d\t key1: %d\t key2: %d\t key3: %d\t key4: %d\t key5: %d\t key6: %d \n"
- , current_buttons[0], current_buttons[1], current_buttons[2]
- , current_buttons[3], current_buttons[4], current_buttons[5]
- , current_buttons[6]);
- }
- }
- close(buttons_fd);
- return 0;
- }</p><p style="box-sizing: inherit; margin-top: 16px; margin-bottom: 14px; line-height: 28px; color: rgb(61, 70, 77); font-family: " pingfang="" sc",="" stheiti,="" "lantinghei="" "open="" sans",="" arial,="" "hiragino="" sans="" gb",="" "microsoft="" yahei",="" "wenquanyi="" micro="" hei",="" simsun,="" sans-serif;="" font-size:="" 16px;"=""></p>
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