fpgafs/fpgafs_lldrv_dbg.c

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/* *****************************************************************
* (C) Copyright 2007 Benjamin Krill <ben@codiert.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
* MA 02110-1301 USA
* *****************************************************************/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pagemap.h>
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#include <linux/slab.h>
#include <linux/mm.h>
#include "fpgafs.h"
#define MEM_SIZE 255
/* some test memory */
static char *mem;
static unsigned int stat;
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static int do_cmd(uint32_t cmd, uint32_t data)
{
switch(cmd) {
case BLA:
stat = data;
break;
default:
return -EFAULT;
}
return 0;
}
static int fpgafs_stat_dbg(struct fpga_context *ctx, unsigned char *buf, int len)
{
//struct fpga_context *ctx = file->private_data;
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uint32_t data;
data=stat;
if (copy_to_user(buf, &data, sizeof(data)))
return -EFAULT;
return 4;
}
static int fpgafs_cmd_dbg(struct fpga_context *ctx, const char __user *buf, int len)
{
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uint32_t data, __user *udata;
if (len < 4)
return -EINVAL;
udata = (void __user *)buf;
if (!access_ok(VERIFY_READ, buf, len))
return -EFAULT;
if (__get_user(data, udata))
return -EFAULT;
do_cmd(BLA,data);
return 4;
}
static int fpgafs_send_data_dbg(struct fpga_context *ctx, const char __user *buf, int len)
{
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uint32_t cp = 0;
uint8_t __user *usr;
if (mem == NULL)
return -EBUSY;
len = (len > MEM_SIZE)?MEM_SIZE:len;
if (len < 2)
return -EINVAL;
if (!access_ok(VERIFY_READ, buf, len))
return -EFAULT;
while (cp < len) {
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usr = (uint8_t*)&buf[cp];
if (__get_user(mem[cp], usr))
return -EFAULT;
cp++;
}
return len;
}
static int fpgafs_recv_data_dbg(struct fpga_context *ctx, unsigned char *buf, int len)
{
printk("fpgafs: receive data DEBUG\n");
len = (len > MEM_SIZE)?MEM_SIZE:len;
if (copy_to_user(buf, mem, len))
return -EFAULT;
return len;
}
static int fpgafs_read_load_dbg(struct fpga_context *ctx, unsigned char *buf, int len)
{
if (ctx->load_buf == NULL)
return -EBUSY;
len = len > sizeof(ctx->load_buf)?sizeof(ctx->load_buf):len;
if (copy_to_user(buf, ctx->load_buf, len))
return -EFAULT;
return len;
}
static int fpgafs_write_load_dbg(struct fpga_context *ctx, const char __user *buf, int len)
{
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uint32_t cp = 0;
uint8_t __user *usr;
if (ctx->load_buf != NULL)
return -EBUSY;
if (len < 2)
return -EINVAL;
if (!access_ok(VERIFY_READ, buf, len))
return -EFAULT;
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ctx->load_buf = kmalloc(len, GFP_USER);
while (cp < len) {
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usr = (uint8_t*)&buf[cp];
if (__get_user(ctx->load_buf[cp], usr))
return -EFAULT;
cp++;
}
return len;
}
static int fpgafs_init_dbg(void)
{
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mem = kmalloc(MEM_SIZE, GFP_USER);
return 0;
}
static int fpgafs_exit_dbg(void)
{
kfree(mem);
return 0;
}
static struct fpgafs_lldrv fpgafs_lldrv_dbg = {
.name = "dbg",
.init = fpgafs_init_dbg,
.exit = fpgafs_exit_dbg,
.send = &fpgafs_send_data_dbg,
.recv = &fpgafs_recv_data_dbg,
.stat = &fpgafs_stat_dbg,
.cmd = &fpgafs_cmd_dbg,
.read_load = &fpgafs_read_load_dbg,
.write_load = &fpgafs_write_load_dbg,
};
/* init exit functions ... */
int __init fpgafs_lldrv_dbg_init(void)
{
return fpgafs_register_lldrv(&fpgafs_lldrv_dbg);
}
void __exit fpgafs_lldrv_dbg_exit(void)
{
fpgafs_unregister_lldrv(&fpgafs_lldrv_dbg);
}
module_init(fpgafs_lldrv_dbg_init);
module_exit(fpgafs_lldrv_dbg_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Benjamin Krill <ben@codiert.org>");