led_driver.rar_s3c2410嵌入式led

/* * 2006 OURS TECH * * <liduoli@sina.com> * This file for explain how to use a simple driver */ #include <linux/config.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/timer.h> #include <linux/init.h> #include <linux/module.h> #include <asm/hardware.h> // GPIO_LED DEVICE MAJOR #define SIMPLE_GPIO_LED_MAJOR 97 #define OURS_GPIO_LED_DEBUG // define LED #define OURS_GPIO_LED (GPIO96) //define LED STATUS #define LED_ON 0 #define LED_OFF 1 // define cmd #define ctl_GPIO_LED1 1 #define VERSION "PXA2700EP-gpio-V1.00-060607" void showversion(void) { printk("*********************************************\n"); printk("\t %s \t\n", VERSION); printk("*********************************************\n\n"); } // ------------------- READ ------------------------ ssize_t SIMPLE_GPIO_LED_read (struct file * file ,char * buf, size_t count, loff_t * f_ops) { #ifdef OURS_GPIO_LED_DEBUG printk ("SIMPLE_GPIO_LED_read [ --kernel--]\n"); #endif return count; } // ------------------- WRITE ----------------------- ssize_t SIMPLE_GPIO_LED_write (struct file * file ,const char * buf, size_t count, loff_t * f_ops) { #ifdef OURS_GPIO_LED_DEBUG printk ("SIMPLE_GPIO_LED_write [ --kernel--]\n"); #endif return count; } // ------------------- IOCTL ----------------------- ssize_t SIMPLE_GPIO_LED_ioctl (struct inode * inode ,struct file * file, unsigned int cmd, long data) { #ifdef OURS_GPIO_LED_DEBUG printk ("SIMPLE_GPIO_LED_ioctl [ --kernel--]\n"); #endif switch (cmd) { case LED_ON : {GPCR3 |= 0x1;break;} case LED_OFF: {GPSR3 |= 0x1;break;} default : {printk ("lcd control : no cmd run [ --kernel-- ]\n"); return (-EINVAL);} } return 0; } // ------------------- OPEN ------------------------ ssize_t SIMPLE_GPIO_LED_open (struct inode * inode ,struct file * file) { #ifdef OURS_GPIO_LED_DEBUG printk ("SIMPLE_GPIO_LED_open [ --kernel--]\n"); #endif MOD_INC_USE_COUNT; return 0; } // ------------------- RELEASE/CLOSE --------------- ssize_t SIMPLE_GPIO_LED_release (struct inode * inode ,struct file * file) { #ifdef OURS_GPIO_LED_DEBUG printk ("SIMPLE_GPIO_LED_release [ --kernel--]\n"); #endif MOD_DEC_USE_COUNT; return 0; } // ------------------------------------------------- struct file_operations GPIO_LED_ctl_ops ={ open: SIMPLE_GPIO_LED_open, read: SIMPLE_GPIO_LED_read, write: SIMPLE_GPIO_LED_write, ioctl: SIMPLE_GPIO_LED_ioctl, release: SIMPLE_GPIO_LED_release, }; // ------------------- INIT ------------------------ static int __init HW_GPIO_LED_CTL_init(void) { int ret = -ENODEV; printk("hhhhhhhhhhhhhhhhhhhhhhhhhhhhh\n\n"); showversion(); // init GPIO GPDR3 |= 0x00000001; // SET GPIO96 OUTPUT MODE GPSR3 |= 0x00000001; // OFF THE LED #ifdef OURS_GPIO_LED_DEBUG printk (" GPLR3=%x \n",GPLR3); printk (" GPDR3=%x \n",GPDR3); #endif ret = devfs_register_chrdev(SIMPLE_GPIO_LED_MAJOR, "gpio_led_ctl", &GPIO_LED_ctl_ops); if( ret < 0 ) { printk (" pxa270: init_module failed with %d\n [ --kernel--]", ret); return ret; } else { printk(" pxa270 gpio_led_driver register success!!! [ --kernel--]\n"); } return ret; } static int __init pxa270_GPIO_LED_CTL_init(void) { int ret = -ENODEV; #ifdef OURS_GPIO_LED_DEBUG printk ("pxa270_GPIO_LED_CTL_init [ --kernel--]\n"); #endif ret = HW_GPIO_LED_CTL_init(); if (ret) return ret; return 0; } static void __exit cleanup_GPIO_LED_ctl(void) { #ifdef OURS_GPIO_LED_DEBUG printk ("cleanup_GPIO_LED_ctl [ --kernel--]\n"); #endif devfs_unregister_chrdev (SIMPLE_GPIO_LED_MAJOR, "gpio_led_ctl" ); } MODULE_DESCRIPTION("simple gpio_led driver module"); MODULE_AUTHOR("liduo"); MODULE_LICENSE("GPL"); module_init(pxa270_GPIO_LED_CTL_init); module_exit(cleanup_GPIO_LED_ctl);