linux hpi 驱动

#include "hpi.h" int fdrv_open(struct inode *inode, struct file *filp); int fdrv_release(struct inode *inode, struct file *filp) ; ssize_t fdrv_write(struct file *filp, const int *buf, size_t count, loff_t *offp) ; ssize_t fdrv_read(struct file *filp, int *buf, size_t count, loff_t *offp) ; int fdrv_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long addr); loff_t fdrv_seek(struct file *filp,loff_t off, int whence); struct file_operations fdrv_fops= { owner: THIS_MODULE, read: fdrv_read, write: fdrv_write, open: fdrv_open, release: fdrv_release, llseek: fdrv_seek, ioctl: fdrv_ioctl, }; loff_t fdrv_seek(struct file *filp,loff_t off, int whence) { hpi_RegAddr_temp = hpi_RegAddr + off/4; return hpi_RegAddr_temp; } int fdrv_open(struct inode *inode, struct file *filp) { MOD_INC_USE_COUNT; return 0; } int fdrv_release(struct inode *inode, struct file *filp) { MOD_DEC_USE_COUNT; return 0; } ssize_t fdrv_write(struct file *filp, const int *buf, size_t count, loff_t *offp) { int i,temp; temp = hpi_RegAddr_temp; for(i=0;i<count;i++){ *(hpi_RegAddr_temp++)= *(buf++); } hpi_RegAddr_temp=temp; return count; } ssize_t fdrv_read(struct file *filp, int *buf, size_t count, loff_t *offp) { int i,temp; temp = hpi_RegAddr_temp; for(i=0;i<count;i++){ *(buf++)= *(hpi_RegAddr_temp++); } hpi_RegAddr_temp=temp; return count; } int fdrv_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long addr) { return -EINVAL; } static int __init init_hpi(void) { AT91_SYS->EBI_SMC2_CSR[7] = 0x22003488; //----------------------------------------------------------------------------------------------------------------- if (!request_mem_region(HPI_PHYSICAL_REG_ADDR,HPI_PHYSICAL_REG_SIZE, "HPI_DRIVER")) printk("Error request mem \n"); hpi_RegAddr = (unsigned int*) ioremap_nocache(HPI_PHYSICAL_REG_ADDR,HPI_PHYSICAL_REG_SIZE); printk("HPI:Phys Reg address:%X \n", hpi_RegAddr); if (!hpi_RegAddr) printk("HPI_init: ioremap() returned NULL\n"); //----------------------------------------------------------------------------------------------------------------- register_chrdev(MAJOR_NUM, "HPI", &fdrv_fops); printk("hpi device installed.\n"); return 0; } //void cleanup_module( void ) static void __exit exit_hpi(void) { printk("HPI device uninstalled.\n"); } module_init(init_hpi); module_exit(exit_hpi);