// SPDX-License-Identifier: GPL-2.0
/*
 *	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 <mj@atrey.karlin.mff.cuni.cz>
 */

#include <linux/types.h>
#include <linux/zorro.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/init.h>
#include <linux/export.h>

#include <asm/byteorder.h>
#include <linux/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)
{
	return fixed_size_llseek(file, off, whence, sizeof(struct ConfigDev));
}

static ssize_t
proc_bus_zorro_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
{
	struct zorro_dev *z = PDE_DATA(file_inode(file));
	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 = cpu_to_be16(z->slotaddr);
	cd.cd_SlotSize = cpu_to_be16(z->slotsize);
	cd.cd_BoardAddr = cpu_to_be32(zorro_resource_start(z));
	cd.cd_BoardSize = cpu_to_be32(zorro_resource_len(z));

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

	return nbytes;
}

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

static void * zorro_seq_start(struct seq_file *m, loff_t *pos)
{
	return (*pos < zorro_num_autocon) ? pos : NULL;
}

static void * zorro_seq_next(struct seq_file *m, void *v, loff_t *pos)
{
	(*pos)++;
	return (*pos < zorro_num_autocon) ? pos : NULL;
}

static void zorro_seq_stop(struct seq_file *m, void *v)
{
}

static int zorro_seq_show(struct seq_file *m, void *v)
{
	unsigned int slot = *(loff_t *)v;
	struct zorro_dev *z = &zorro_autocon[slot];

	seq_printf(m, "%02x\t%08x\t%08lx\t%08lx\t%02x\n", slot, z->id,
		   (unsigned long)zorro_resource_start(z),
		   (unsigned long)zorro_resource_len(z),
		   z->rom.er_Type);
	return 0;
}

static const struct seq_operations zorro_devices_seq_ops = {
	.start = zorro_seq_start,
	.next  = zorro_seq_next,
	.stop  = zorro_seq_stop,
	.show  = zorro_seq_show,
};

static struct proc_dir_entry *proc_bus_zorro_dir;

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

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

static int __init zorro_proc_init(void)
{
	unsigned int slot;

	if (MACH_IS_AMIGA && AMIGAHW_PRESENT(ZORRO)) {
		proc_bus_zorro_dir = proc_mkdir("bus/zorro", NULL);
		proc_create_seq("devices", 0, proc_bus_zorro_dir,
			    &zorro_devices_seq_ops);
		for (slot = 0; slot < zorro_num_autocon; slot++)
			zorro_proc_attach_device(slot);
	}
	return 0;
}

device_initcall(zorro_proc_init);