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#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/utsname.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <libkmod.h>
#include "common.h"
static void set_modules_from_modalias_file(struct kmod_ctx *ctx, struct pciusb_entry *e, char *modalias_path) {
FILE *file;
file = fopen(modalias_path, "r");
if (file) {
char *modalias = NULL;
size_t n, size;
if (-1 == getline(&modalias, &n, file)) {
fprintf(stderr, "Unable to read modalias from %s\n", modalias_path);
fclose(file);
return;
}
fclose(file);
size = strlen(modalias);
if (size)
modalias[size-1] = 0;
ifree(e->module);
e->module = modalias_resolve_module(ctx, modalias);
free(modalias);
} else {
fprintf(stderr, "Unable to read modalias from %s\n", modalias_path);
return;
}
}
static void find_pci_modules_through_aliases(struct kmod_ctx *ctx, struct pciusb_entry *e) {
char *modalias_path;
asprintf(&modalias_path,
"/sys/bus/pci/devices/%04x:%02x:%02x.%x/modalias",
e->pci_domain, e->pci_bus, e->pci_device, e->pci_function);
set_modules_from_modalias_file(ctx, e, modalias_path);
free(modalias_path);
}
static void find_usb_modules_through_aliases(struct kmod_ctx *ctx, struct pciusb_entry *e) {
char *usb_prefix, *sysfs_path;
DIR *dir;
struct dirent *dent;
asprintf(&usb_prefix, "%d-", e->pci_bus);
/* USB port is indexed from 0 in procfs, from 1 in sysfs */
asprintf(&sysfs_path, "/sys/bus/usb/devices/%d-%d", e->pci_bus, e->usb_port + 1);
dir = opendir(sysfs_path);
if (!dir) {
goto end;
}
while ((dent = readdir(dir)) != NULL) {
if ((dent->d_type == DT_DIR) &&
!strncmp(usb_prefix, dent->d_name, strlen(usb_prefix))) {
char *modalias_path;
asprintf(&modalias_path, "%s/%s/modalias", sysfs_path, dent->d_name);
set_modules_from_modalias_file(ctx, e, modalias_path);
free(modalias_path);
/* maybe we would need a "other_modules" field in pciusb_entry
to list modules from all USB interfaces */
if (e->module)
break;
}
}
closedir(dir);
end:
free(sysfs_path);
free(usb_prefix);
}
static void find_modules_through_aliases_one(struct kmod_ctx *ctx, const char *bus, struct pciusb_entry *e) {
if (!strcmp("pci", bus)) {
find_pci_modules_through_aliases(ctx, e);
} else if (!strcmp("usb", bus)) {
find_usb_modules_through_aliases(ctx, e);
}
}
static void find_modules_through_aliases(const char *bus, struct pciusb_entries *entries) {
unsigned int i;
struct kmod_ctx *ctx = modalias_init();
for (i = 0; i < entries->nb; i++) {
struct pciusb_entry *e = &entries->entries[i];
// No special case found in pcitable ? Then lookup modalias for PCI devices
if (e->module && strcmp(e->module, "unknown"))
continue;
find_modules_through_aliases_one(ctx, bus, e);
}
modalias_cleanup(ctx);
}
extern int pciusb_find_modules(struct pciusb_entries *entries, const char *fpciusbtable, const descr_lookup descr_lookup, int is_pci) {
fh f;
char buf[2048];
int line;
f = fh_open(fpciusbtable);
for (line = 1; fh_gets(buf, sizeof(buf) - 1, &f); line++) {
unsigned short vendor, device, subvendor, subdevice;
char *p = NULL, *q = NULL;
int offset; unsigned int i;
int nb;
if (buf[0]=='#')
continue; // skip comments
nb = sscanf(buf, "0x%hx\t0x%hx\t0x%hx\t0x%hx\t%n", &vendor, &device, &subvendor, &subdevice, &offset);
if (nb != 4) {
nb = sscanf(buf, "0x%hx\t0x%hx\t%n", &vendor, &device, &offset);
if (nb != 2) {
fprintf(stderr, "%s %d: bad line\n", fpciusbtable, line);
continue; // skip bad line
}
}
for (i = 0; i < entries->nb; i++) {
struct pciusb_entry *e = &entries->entries[i];
if (e->already_found)
continue; // skip since already found with sub ids
if (vendor != e->vendor || device != e->device)
continue; // main ids differ
if (nb == 4 && !(subvendor == e->subvendor && subdevice == e->subdevice))
continue; // subids differ
if (!p) { // only calc text & module if not already done
p = buf + offset + 1;
q = strchr(p, '\t');
if (!q) // no description field?
q = strchr(p, '\0') - 1;
}
if (strncmp(p, "unknown", q-p-1)) {
ifree(e->module);
e->module = strndup(p,q-p-1);
}
/* special case for buggy 0x0 usb entry */
if (descr_lookup == LOAD && strlen(q) > 1 && 2 < strlen(q+2) && vendor != 0 && device != 0 && e->class_id != 0x90000d) { /* Hub class */
ifree(e->text); /* usb.c set it so that we display something when usbtable doesn't refer that hw*/
e->text = strndup(q+2, strlen(q)-4);
}
/* if subids read on pcitable line, we know that subids matches :
(see "subids differ" test above) */
if (nb == 4)
e->already_found = 1;
}
}
fh_close(&f);
/* If no special case in pcitable, then lookup modalias for devices */
const char *bus = is_pci ? "pci" : "usb";
find_modules_through_aliases(bus, entries);
return 1;
}
extern void pciusb_initialize(struct pciusb_entry *e) {
e->vendor = 0xffff;
e->device = 0xffff;
e->subvendor = 0xffff;
e->subdevice = 0xffff;
e->class_id = 0;
e->pci_bus = 0xff;
e->pci_device = 0xff;
e->pci_function = 0xff;
e->pci_revision = 0;
e->usb_port = 0xffff;
e->module = NULL;
e->text = NULL;
e->class = NULL;
e->already_found = 0;
e->is_pciexpress = 0;
}
extern void pciusb_free(struct pciusb_entries *entries) {
unsigned int i;
for (i = 0; i < entries->nb; i++) {
struct pciusb_entry *e = &entries->entries[i];
ifree(e->module);
ifree(e->text);
ifree(e->class);
}
if (entries->nb) ifree(entries->entries);
}
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