94 lines
1.8 KiB
C
94 lines
1.8 KiB
C
/*********************************************
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* Benjamin Krill <ben@codiert.org>
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*********************************************/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/pagemap.h>
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#include <linux/mm.h>
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#include "fpgafs.h"
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static int load = 0;
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static unsigned char *load_buf;
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static int fpgafs_send_data_dbg(const char __user *buf, int len)
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{
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printk("fpgafs: send data DEBUG\n");
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return 0;
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}
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static int fpgafs_recv_data_dbg(unsigned char *buf, int len)
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{
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printk("fpgafs: receive data DEBUG\n");
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return 4;
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}
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static int fpgafs_read_load_dbg(unsigned char *buf, int len)
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{
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if (load == 0)
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return -EBUSY;
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len = len > sizeof(load_buf)?sizeof(load_buf):len;
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if (copy_to_user(buf, load_buf, len))
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return -EFAULT;
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return len;
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}
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static int fpgafs_write_load_dbg(const char __user *buf, int len)
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{
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u32 cp = 0;
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u8 __user *usr;
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if (load == 1)
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return -EBUSY;
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if (len < 2)
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return -EINVAL;
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if (!access_ok(VERIFY_READ, buf, len))
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return -EFAULT;
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load_buf = kmalloc(len,GFP_USER);
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while (cp < len) {
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usr = (u8*)&buf[cp];
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if (__get_user(load_buf[cp], usr))
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return -EFAULT;
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cp++;
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}
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load = 1;
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return len;
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}
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static struct fpgafs_lldrv fpgafs_lldrv_dbg = {
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.name = "dbg",
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.init = NULL,
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.exit = NULL,
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.send = &fpgafs_send_data_dbg,
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.recv = &fpgafs_recv_data_dbg,
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.read_load = &fpgafs_read_load_dbg,
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.write_load = &fpgafs_write_load_dbg,
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};
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/* init exit functions ... */
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int __init fpgafs_lldrv_dbg_init(void)
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{
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return fpgafs_register_lldrv(&fpgafs_lldrv_dbg);
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}
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void __exit fpgafs_lldrv_dbg_exit(void)
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{
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load = 0;
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kfree(load_buf);
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fpgafs_unregister_lldrv(&fpgafs_lldrv_dbg);
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}
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module_init(fpgafs_lldrv_dbg_init);
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module_exit(fpgafs_lldrv_dbg_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Benjamin Krill <ben@codiert.org>");
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