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// SPDX-License-Identifier: LGPL-2.1
// Copyright (C) 2014-2020, Intel Corporation. All rights reserved.
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <stdarg.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <ctype.h>
#include <fcntl.h>
#include <dirent.h>
#include <libkmod.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <util/log.h>
#include <util/sysfs.h>
int __sysfs_read_attr(struct log_ctx *ctx, const char *path, char *buf)
{
int fd = open(path, O_RDONLY|O_CLOEXEC);
int n;
if (fd < 0) {
log_dbg(ctx, "failed to open %s: %s\n", path, strerror(errno));
return -errno;
}
n = read(fd, buf, SYSFS_ATTR_SIZE);
close(fd);
if (n < 0 || n >= SYSFS_ATTR_SIZE) {
buf[0] = 0;
log_dbg(ctx, "failed to read %s: %s\n", path, strerror(errno));
return -errno;
}
buf[n] = 0;
if (n && buf[n-1] == '\n')
buf[n-1] = 0;
return 0;
}
static int write_attr(struct log_ctx *ctx, const char *path,
const char *buf, int quiet)
{
int fd = open(path, O_WRONLY|O_CLOEXEC);
int n, len = strlen(buf) + 1, rc;
if (fd < 0) {
rc = -errno;
log_dbg(ctx, "failed to open %s: %s\n", path, strerror(errno));
return rc;
}
n = write(fd, buf, len);
rc = -errno;
close(fd);
if (n < len) {
if (!quiet)
log_dbg(ctx, "failed to write %s to %s: %s\n", buf, path,
strerror(errno));
return rc;
}
return 0;
}
int __sysfs_write_attr(struct log_ctx *ctx, const char *path,
const char *buf)
{
return write_attr(ctx, path, buf, 0);
}
int __sysfs_write_attr_quiet(struct log_ctx *ctx, const char *path,
const char *buf)
{
return write_attr(ctx, path, buf, 1);
}
int __sysfs_device_parse(struct log_ctx *ctx, const char *base_path,
const char *dev_name, void *parent, add_dev_fn add_dev)
{
int add_errors = 0;
struct dirent *de;
DIR *dir;
log_dbg(ctx, "base: '%s' dev: '%s'\n", base_path, dev_name);
dir = opendir(base_path);
if (!dir) {
log_dbg(ctx, "no \"%s\" devices found\n", dev_name);
return -ENODEV;
}
while ((de = readdir(dir)) != NULL) {
char *dev_path;
char fmt[20];
void *dev;
int id;
sprintf(fmt, "%s%%d", dev_name);
if (de->d_ino == 0)
continue;
if (sscanf(de->d_name, fmt, &id) != 1)
continue;
if (asprintf(&dev_path, "%s/%s", base_path, de->d_name) < 0) {
log_err(ctx, "%s%d: path allocation failure\n",
dev_name, id);
continue;
}
dev = add_dev(parent, id, dev_path);
free(dev_path);
if (!dev) {
add_errors++;
log_err(ctx, "%s%d: add_dev() failed\n",
dev_name, id);
} else
log_dbg(ctx, "%s%d: processed\n", dev_name, id);
}
closedir(dir);
return add_errors;
}
struct kmod_module *__util_modalias_to_module(struct kmod_ctx *kmod_ctx,
const char *alias,
struct log_ctx *log)
{
struct kmod_list *list = NULL;
struct kmod_module *mod;
int rc;
if (!kmod_ctx)
return NULL;
rc = kmod_module_new_from_lookup(kmod_ctx, alias, &list);
if (rc < 0 || !list) {
log_dbg(log,
"failed to find module for alias: %s %d list: %s\n",
alias, rc, list ? "populated" : "empty");
return NULL;
}
mod = kmod_module_get_module(list);
log_dbg(log, "alias: %s module: %s\n", alias,
kmod_module_get_name(mod));
kmod_module_unref_list(list);
return mod;
}
int __util_bind(const char *devname, struct kmod_module *module,
const char *bus, struct log_ctx *ctx)
{
DIR *dir;
int rc = 0;
char path[200];
struct dirent *de;
const int len = sizeof(path);
if (!devname) {
log_err(ctx, "missing devname\n");
return -EINVAL;
}
if (module) {
rc = kmod_module_probe_insert_module(module,
KMOD_PROBE_APPLY_BLACKLIST,
NULL, NULL, NULL, NULL);
if (rc < 0) {
log_err(ctx, "%s: insert failure: %d\n", __func__, rc);
return rc;
}
}
if (snprintf(path, len, "/sys/bus/%s/drivers", bus) >= len) {
log_err(ctx, "%s: buffer too small!\n", devname);
return -ENXIO;
}
dir = opendir(path);
if (!dir) {
log_err(ctx, "%s: opendir(\"%s\") failed\n", devname, path);
return -ENXIO;
}
while ((de = readdir(dir)) != NULL) {
char *drv_path;
if (de->d_ino == 0)
continue;
if (de->d_name[0] == '.')
continue;
if (asprintf(&drv_path, "%s/%s/bind", path, de->d_name) < 0) {
log_err(ctx, "%s: path allocation failure\n", devname);
continue;
}
rc = __sysfs_write_attr_quiet(ctx, drv_path, devname);
free(drv_path);
if (rc == 0)
break;
}
closedir(dir);
if (rc) {
log_dbg(ctx, "%s: bind failed\n", devname);
return -ENXIO;
}
return 0;
}
int __util_unbind(const char *devpath, struct log_ctx *ctx)
{
const char *devname = devpath_to_devname(devpath);
char path[200];
const int len = sizeof(path);
if (snprintf(path, len, "%s/driver/unbind", devpath) >= len) {
log_err(ctx, "%s: buffer too small!\n", devname);
return -ENXIO;
}
return __sysfs_write_attr(ctx, path, devname);
}
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