proc.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 140 行

/*
 *	$Id: proc.c,v 1.1.2.1 1998/06/07 23:21:01 geert Exp $
 *
 *	Procfs interface for the Zorro bus.
 *
 *	Copyright (C) 1998-2003 Geert Uytterhoeven
 *
 *	Heavily based on the procfs interface for the PCI bus, which is
 *
 *	Copyright (C) 1997, 1998 Martin Mares <[e-mail]>
 */

#include <linux/types.h>
#include <linux/zorro.h>
#include <linux/proc_fs.h>
#include <linux/init.h>
#include <linux/smp_lock.h>
#include <asm/uaccess.h>
#include <asm/amigahw.h>
#include <asm/setup.h>

static loff_t
proc_bus_zorro_lseek(struct file *file, loff_t off, int whence)
{
	loff_t new = -1;

	lock_kernel();
	switch (whence) {
	case 0:
		new = off;
		break;
	case 1:
		new = file->f_pos + off;
		break;
	case 2:
		new = sizeof(struct ConfigDev) + off;
		break;
	}
	if (new < 0 || new > sizeof(struct ConfigDev)) {
		unlock_kernel();
		return -EINVAL;
	}
	unlock_kernel();
	return (file->f_pos = new);
}

static ssize_t
proc_bus_zorro_read(struct file *file, char *buf, size_t nbytes, loff_t *ppos)
{
	struct inode *ino = file->f_dentry->d_inode;
	struct proc_dir_entry *dp = PDE(ino);
	struct zorro_dev *z = dp->data;
	struct ConfigDev cd;
	loff_t pos = *ppos;

	if (pos >= sizeof(struct ConfigDev))
		return 0;
	if (nbytes >= sizeof(struct ConfigDev))
		nbytes = sizeof(struct ConfigDev);
	if (pos + nbytes > sizeof(struct ConfigDev))
		nbytes = sizeof(struct ConfigDev) - pos;

	/* Construct a ConfigDev */
	memset(&cd, 0, sizeof(cd));
	cd.cd_Rom = z->rom;
	cd.cd_SlotAddr = z->slotaddr;
	cd.cd_SlotSize = z->slotsize;
	cd.cd_BoardAddr = (void *)zorro_resource_start(z);
	cd.cd_BoardSize = zorro_resource_len(z);

	if (copy_to_user(buf, &cd, nbytes))
		return -EFAULT;
	*ppos += nbytes;

	return nbytes;
}

static struct file_operations proc_bus_zorro_operations = {
	.llseek		= proc_bus_zorro_lseek,
	.read		= proc_bus_zorro_read,
};

static int
get_zorro_dev_info(char *buf, char **start, off_t pos, int count)
{
	u_int slot;
	off_t at = 0;
	int len, cnt;

	for (slot = cnt = 0; slot < zorro_num_autocon && count > cnt; slot++) {
		struct zorro_dev *z = &zorro_autocon[slot];
		len = sprintf(buf, "%02x\t%08x\t%08lx\t%08lx\t%02x\n", slot,
			      z->id, zorro_resource_start(z),
			      zorro_resource_len(z), z->rom.er_Type);
		at += len;
		if (at >= pos) {
			if (!*start) {
				*start = buf + (pos - (at - len));
				cnt = at - pos;
			} else
				cnt += len;
			buf += len;
		}
	}
	return (count > cnt) ? cnt : count;
}

static struct proc_dir_entry *proc_bus_zorro_dir;

static int __init zorro_proc_attach_device(u_int slot)
{
	struct proc_dir_entry *entry;
	char name[4];

	sprintf(name, "%02x", slot);
	entry = create_proc_entry(name, 0, proc_bus_zorro_dir);
	if (!entry)
		return -ENOMEM;
	entry->proc_fops = &proc_bus_zorro_operations;
	entry->data = &zorro_autocon[slot];
	entry->size = sizeof(struct zorro_dev);
	return 0;
}

static int __init zorro_proc_init(void)
{
	u_int slot;

	if (MACH_IS_AMIGA && AMIGAHW_PRESENT(ZORRO)) {
		proc_bus_zorro_dir = proc_mkdir("zorro", proc_bus);
		create_proc_info_entry("devices", 0, proc_bus_zorro_dir,
				       get_zorro_dev_info);
		for (slot = 0; slot < zorro_num_autocon; slot++)
			zorro_proc_attach_device(slot);
	}
	return 0;
}

__initcall(zorro_proc_init);