proc.c

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/*
 *  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 <[email protected]>
 */

#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/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;
    struct inode *inode = file->f_path.dentry->d_inode;

    mutex_lock(&inode->i_mutex);
    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))
        new = -EINVAL;
    else
        file->f_pos = new;
    mutex_unlock(&inode->i_mutex);
    return new;
}

static ssize_t
proc_bus_zorro_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
{
    struct inode *ino = file->f_path.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, (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 int zorro_devices_proc_open(struct inode *inode, struct file *file)
{
    return seq_open(file, &zorro_devices_seq_ops);
}

static const struct file_operations zorro_devices_proc_fops = {
    .owner      = THIS_MODULE,
    .open       = zorro_devices_proc_open,
    .read       = seq_read,
    .llseek     = seq_lseek,
    .release    = seq_release,
};

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;
    entry->size = 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("devices", 0, proc_bus_zorro_dir,
                &zorro_devices_proc_fops);
        for (slot = 0; slot < zorro_num_autocon; slot++)
            zorro_proc_attach_device(slot);
    }
    return 0;
}

device_initcall(zorro_proc_init);