72 lines
1.4 KiB
C
72 lines
1.4 KiB
C
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#include <linux/fs.h>
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#include <linux/module.h>
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#include <linux/version.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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#include "fpgafs.h"
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/* generic open function for all pipe-like files */
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static int fpgafs_pipe_open(struct inode *inode, struct file *file)
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{
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struct fpgafs_inode_info *i = FPGAFS_I(inode);
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file->private_data = i->i_ctx;
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return nonseekable_open(inode, file);
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}
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static ssize_t fpgafs_stat_read(struct file *file, char __user *buf,
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size_t len, loff_t *pos)
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{
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struct fpga_context *ctx = file->private_data;
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u32 data, __user *udata;
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ssize_t count;
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if (len < 4)
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return -EINVAL;
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if (!access_ok(VERIFY_WRITE, buf, len))
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return -EFAULT;
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udata = (void __user *)buf;
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for (count = 0; (count + 4) <= len; count += 4, udata++) {
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int ret;
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/* operation to read the status ... */
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data=0x42;
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ret = 0;
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if (ret == 0)
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break;
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ret = __put_user(data, udata);
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if (ret) {
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if (!count)
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count = -EFAULT;
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break;
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}
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}
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if (!count)
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count = -EAGAIN;
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return count;
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}
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static const struct file_operations fpgafs_stat_fops = {
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.open = fpgafs_pipe_open,
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.read = fpgafs_stat_read,
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};
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struct tree_descr fpgafs_dir_contents[] = {
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#if 0
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{ "cmd", &fpgafs_cmd_fops, 0222, },
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{ "din", &spufs_mbox_fops, 0222, },
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{ "dout", &spufs_ibox_fops, 0444, },
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{ "load", &spufs_wbox_fops, 0666, },
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#endif
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{ "stat", &fpgafs_stat_fops, 0444, },
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{},
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};
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