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/*
* $Id: proc.c,v 1.1 1999/01/22 21:05:39 mj Exp $
*
* The PCI Library -- Configuration Access via /proc/bus/pci
*
* Copyright (c) 1997--1999 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include "internal.h"
#include <asm/unistd.h>
#if defined(__GLIBC__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 1
#include <syscall-list.h>
#endif
/*
* As libc doesn't support pread/pwrite yet, we have to call them directly
* or use lseek/read/write instead.
*/
#if !(defined(__GLIBC__) && __GLIBC__ == 2 && __GLIBC_MINOR__ > 0)
#if defined(__GLIBC__) && !(defined(__powerpc__) && __GLIBC__ == 2 && __GLIBC_MINOR__ == 0)
#ifndef SYS_pread
#define SYS_pread __NR_pread
#endif
static int
pread(unsigned int fd, void *buf, size_t size, loff_t where)
{
return syscall(SYS_pread, fd, buf, size, where);
}
#ifndef SYS_pwrite
#define SYS_pwrite __NR_pwrite
#endif
static int
pwrite(unsigned int fd, void *buf, size_t size, loff_t where)
{
return syscall(SYS_pwrite, fd, buf, size, where);
}
#else
static _syscall4(int, pread, unsigned int, fd, void *, buf, size_t, size, loff_t, where);
static _syscall4(int, pwrite, unsigned int, fd, void *, buf, size_t, size, loff_t, where);
#endif
#endif
static void
proc_config(struct pci_access *a)
{
a->method_params[PCI_ACCESS_PROC_BUS_PCI] = PATH_PROC_BUS_PCI;
}
static int
proc_detect(struct pci_access *a)
{
char *name = a->method_params[PCI_ACCESS_PROC_BUS_PCI];
if (access(name, R_OK))
{
a->warning("Cannot open %s", name);
return 0;
}
a->debug("...using %s", name);
return 1;
}
static void
proc_init(struct pci_access *a)
{
a->fd = -1;
}
static void
proc_cleanup(struct pci_access *a)
{
if (a->fd >= 0)
{
close(a->fd);
a->fd = -1;
}
}
static void
proc_scan(struct pci_access *a)
{
FILE *f;
char buf[256];
if (snprintf(buf, sizeof(buf), "%s/devices", a->method_params[PCI_ACCESS_PROC_BUS_PCI]) == sizeof(buf))
a->error("File name too long");
f = fopen(buf, "r");
if (!f)
a->error("Cannot open %s", buf);
while (fgets(buf, sizeof(buf)-1, f))
{
struct pci_dev *d = pci_alloc_dev(a);
unsigned int dfn, vend;
sscanf(buf, "%x %x %x %lx %lx %lx %lx %lx %lx %lx",
&dfn,
&vend,
&d->irq,
&d->base_addr[0],
&d->base_addr[1],
&d->base_addr[2],
&d->base_addr[3],
&d->base_addr[4],
&d->base_addr[5],
&d->rom_base_addr);
d->bus = dfn >> 8U;
d->dev = PCI_SLOT(dfn & 0xff);
d->func = PCI_FUNC(dfn & 0xff);
d->vendor_id = vend >> 16U;
d->device_id = vend & 0xffff;
d->known_fields = a->buscentric ? PCI_FILL_IDENT
: (PCI_FILL_IDENT | PCI_FILL_IRQ | PCI_FILL_BASES | PCI_FILL_ROM_BASE);
pci_link_dev(a, d);
}
fclose(f);
}
static int
proc_setup(struct pci_dev *d, int rw)
{
struct pci_access *a = d->access;
if (a->cached_dev != d || a->fd_rw < rw)
{
char buf[256];
if (a->fd >= 0)
close(a->fd);
if (snprintf(buf, sizeof(buf), "%s/%02x/%02x.%d", a->method_params[PCI_ACCESS_PROC_BUS_PCI],
d->bus, d->dev, d->func) == sizeof(buf))
a->error("File name too long");
a->fd_rw = a->writeable || rw;
a->fd = open(buf, a->fd_rw ? O_RDWR : O_RDONLY);
if (a->fd < 0)
a->warning("Cannot open %s", buf);
a->cached_dev = d;
}
return a->fd;
}
static int
proc_read(struct pci_dev *d, int pos, byte *buf, int len)
{
int fd = proc_setup(d, 0);
int res;
if (fd < 0)
return 0;
res = pread(fd, buf, len, pos);
if (res < 0)
{
d->access->warning("proc_read: read failed: %s", strerror(errno));
return 0;
}
else if (res != len)
{
d->access->warning("proc_read: tried to read %d bytes at %d, but got only %d", len, pos, res);
return 0;
}
return 1;
}
static int
proc_write(struct pci_dev *d, int pos, byte *buf, int len)
{
int fd = proc_setup(d, 1);
int res;
if (fd < 0)
return 0;
res = pwrite(fd, buf, len, pos);
if (res < 0)
{
d->access->warning("proc_write: write failed: %s", strerror(errno));
return 0;
}
else if (res != len)
{
d->access->warning("proc_write: tried to write %d bytes at %d, but got only %d", len, pos, res);
return 0;
}
return 1;
}
static void
proc_cleanup_dev(struct pci_dev *d)
{
if (d->access->cached_dev == d)
d->access->cached_dev = NULL;
}
struct pci_methods pm_linux_proc = {
"/proc/bus/pci",
proc_config,
proc_detect,
proc_init,
proc_cleanup,
proc_scan,
pci_generic_fill_info,
proc_read,
proc_write,
NULL, /* init_dev */
proc_cleanup_dev
};
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