152 lines
4.5 KiB
C
152 lines
4.5 KiB
C
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/types.h>
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#include <linux/fs.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/cdev.h>
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#include <linux/ioctl.h>
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#include <linux/mm.h>
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#include <linux/errno.h>
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#include <asm/uaccess.h>
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#include <linux/slab.h> /*for Kmalloc*/
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#include <asm/io.h>
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struct phy_addr_param {
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unsigned int addr;
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unsigned int value;
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};
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#define PHYADDR_IOC_MAGIC 'S'
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#define PHYADDR_SET_VAL _IOW(PHYADDR_IOC_MAGIC, 0, struct phy_addr_param)
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#define PHYADDR_GET_VAL _IOR(PHYADDR_IOC_MAGIC, 1, struct phy_addr_param)
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struct paddr {
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struct cdev cdev;
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struct class *phyaddr_class;
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dev_t dev;
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};
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struct paddr phy_addr_priv;
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static long phyaddr_ioctl(struct file *filp, unsigned int cmd, unsigned long arg){
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int err = 0;
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struct phy_addr_param param;
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/* Check type and command number */
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if (_IOC_TYPE(cmd) != PHYADDR_IOC_MAGIC)
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return -ENOTTY;
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/* Check access direction once here; don't repeat below.
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* IOC_DIR is from the user perspective, while access_ok is
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* from the kernel perspective; so they look reversed.
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*/
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if (_IOC_DIR(cmd) & _IOC_READ)
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err = !access_ok(VERIFY_WRITE,
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(void __user *)arg, _IOC_SIZE(cmd));
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if (err == 0 && _IOC_DIR(cmd) & _IOC_WRITE)
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err = !access_ok(VERIFY_READ,
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(void __user *)arg, _IOC_SIZE(cmd));
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if (err)
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return -EFAULT;
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copy_from_user(¶m, (struct phy_addr_param*)arg, sizeof(struct phy_addr_param));
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// if (param.index >= YGPIO_MAX_PIN_NR) return -EINVAL; //invalid address return
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switch(cmd) {
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case PHYADDR_SET_VAL:
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//if(param.value)
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//printk(KERN_INFO "---- write 0x%x from 0x%08x \n", param.value , param.addr);
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*(volatile unsigned int *)param.addr = param.value;
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//printk(KERN_INFO "---- test write from 0x%08x \n", *(volatile unsigned int *)param.addr);
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break;
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case PHYADDR_GET_VAL:
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//printk(KERN_INFO "---- read from 0x%08x \n", param.addr);
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param.value = *(volatile unsigned int *)param.addr;
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copy_to_user((struct phy_addr_param*)arg, ¶m, sizeof(struct phy_addr_param));
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//printk(KERN_INFO "---- test read from 0x%08x \n", *(volatile unsigned int *)param.addr);
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break;
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default:
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return -ENOTTY;
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}
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return 0;
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}
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static int phyaddr_open(struct inode *inode, struct file *filp)
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{
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return 0;
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}
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static int phyaddr_release(struct inode *inode, struct file *filp)
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{
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return 0;
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}
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struct file_operations phyaddr_fops = {
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.owner = THIS_MODULE,
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.unlocked_ioctl = phyaddr_ioctl,
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.open = phyaddr_open,
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.release = phyaddr_release,
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};
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static int __init phy_addr_init(void)
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{
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int err;
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int result;
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int major;
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result = alloc_chrdev_region(&phy_addr_priv.dev, 0, 0, "phyaddr");
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major = MAJOR(phy_addr_priv.dev);
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if (result < 0) {
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printk(KERN_WARNING "phy_addr: can't get major %d\n", major);
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return result;
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}
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cdev_init(&phy_addr_priv.cdev, &phyaddr_fops);
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phy_addr_priv.cdev.owner = THIS_MODULE;
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phy_addr_priv.cdev.ops = &phyaddr_fops;
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err = cdev_add(&phy_addr_priv.cdev, phy_addr_priv.dev, 1);
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if (err) {
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printk(KERN_NOTICE "Error[%d] cdev_add .\n", err);
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return -1;
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}
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phy_addr_priv.phyaddr_class = class_create(THIS_MODULE, "phyaddr");
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if (IS_ERR(phy_addr_priv.phyaddr_class)) {
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printk(KERN_ERR "Failed in create phyaddr_cdev class\n");
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return -1;
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}
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device_create(phy_addr_priv.phyaddr_class, NULL, phy_addr_priv.dev, NULL, "phyaddr");
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return 0;
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}
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static void __exit phy_addr_exit(void)
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{
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cdev_del(&phy_addr_priv.cdev);
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unregister_chrdev_region(phy_addr_priv.dev, 1);
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device_destroy(phy_addr_priv.phyaddr_class, phy_addr_priv.dev);
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class_destroy(phy_addr_priv.phyaddr_class);
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}
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module_init(phy_addr_init);
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module_exit(phy_addr_exit);
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MODULE_AUTHOR("songxingjia@china-cpu.com");
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MODULE_DESCRIPTION("GSC3280 PHY ADDRESS READ/WRITE Driver");
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MODULE_LICENSE("GPL");
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