今天就跟大家聊聊有关Linux 驱动开发中测试按键的示例分析，可能很多人都不太了解，为了让大家更加了解，小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。
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示例一：
1、驱动代码
#include#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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 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.");
2、测试代码
#include#include #include #include #include #include #include #include #include #include int main(void) { int buttons_fd; char buttons[6] = {'0', '0', '0', '0', '0', '0'}; buttons_fd = open("/dev/buttons", 0); if (buttons_fd < 0) { perror("open device buttons"); exit(1); } 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); } for (i = 0, count_of_changed_key = 0; i < sizeof buttons / sizeof buttons[0]; i++) { if (buttons[i] != current_buttons[i]) { buttons[i] = current_buttons[i]; 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; }
示例二：
1、驱动程序
#include#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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; 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 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.");
2、测试程序
#include#include #include #include #include #include #include #include #include #include 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); } while (1) { int current_buttons[7]; int count_of_changed_key; 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; }
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