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authorJo-Philipp Wich <jow@openwrt.org>2013-09-03 15:46:39 +0000
committerJo-Philipp Wich <jow@openwrt.org>2013-09-03 15:46:39 +0000
commite01fb70f1bd277c9e05046579e43edef325dffa8 (patch)
treeea8b50c8b1e43f30a328f409a95ef7f2bb9cda65 /package/utils/usbreset/src
parent07216b9f466dcfa097b4249720b70ba45968d633 (diff)
downloadupstream-e01fb70f1bd277c9e05046579e43edef325dffa8.tar.gz
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usbreset: rewrite to not rely on /proc/bus/usb anymore
SVN-Revision: 37893
Diffstat (limited to 'package/utils/usbreset/src')
-rw-r--r--package/utils/usbreset/src/usbreset.c118
1 files changed, 50 insertions, 68 deletions
diff --git a/package/utils/usbreset/src/usbreset.c b/package/utils/usbreset/src/usbreset.c
index 087a14cfa4..f6f2ba288a 100644
--- a/package/utils/usbreset/src/usbreset.c
+++ b/package/utils/usbreset/src/usbreset.c
@@ -42,7 +42,11 @@ Alan Stern
#include <fcntl.h>
#include <errno.h>
#include <string.h>
+#include <ctype.h>
+#include <limits.h>
+#include <dirent.h>
#include <sys/ioctl.h>
+#include <sys/types.h>
#include <linux/usbdevice_fs.h>
@@ -59,86 +63,70 @@ struct usbentry {
};
-static bool find_usbfs(void)
+static char *sysfs_attr(const char *dev, const char *attr)
{
- FILE *mtab;
+ int fd, len;
+ char path[PATH_MAX];
+ static char buf[129];
- char buf[1024], type[32];
- static char path[1024];
+ memset(buf, 0, sizeof(buf));
+ snprintf(path, sizeof(path) - 1, "/sys/bus/usb/devices/%s/%s", dev, attr);
- if ((mtab = fopen("/proc/mounts", "r")) != NULL)
+ if ((fd = open(path, O_RDONLY)) >= 0)
{
- while (fgets(buf, sizeof(buf), mtab))
- {
- if (sscanf(buf, "%*s %1023s %31s ", path, type) == 2 &&
- !strncmp(type, "usbfs", 5))
- {
- usbfs = path;
- break;
- }
- }
-
- fclose(mtab);
+ len = read(fd, buf, sizeof(buf) - 1);
+ close(fd);
}
- return !!usbfs;
-}
+ while (--len > 0 && isspace(buf[len]))
+ buf[len] = 0;
-static FILE * open_devlist(void)
-{
- char buf[1024];
- snprintf(buf, sizeof(buf), "%s/devices", usbfs);
- return fopen(buf, "r");
+ return (len >= 0) ? buf : NULL;
}
-static void close_devlist(FILE *devs)
+static struct usbentry * parse_devlist(DIR *d)
{
- fclose(devs);
-}
-
-static struct usbentry * parse_devlist(FILE *devs)
-{
- char buf[1024];
+ char *attr;
+ struct dirent *e;
static struct usbentry dev;
+ do {
+ e = readdir(d);
+
+ if (!e)
+ return NULL;
+ }
+ while(!isdigit(e->d_name[0]) || strchr(e->d_name, ':'));
+
memset(&dev, 0, sizeof(dev));
- while (fgets(buf, sizeof(buf), devs))
- {
- buf[strlen(buf)-1] = 0;
+ if ((attr = sysfs_attr(e->d_name, "busnum")) != NULL)
+ dev.bus_num = strtoul(attr, NULL, 10);
- switch (buf[0])
- {
- case 'T':
- sscanf(buf, "T: Bus=%d Lev=%*d Prnt=%*d Port=%*d Cnt=%*d Dev#=%d",
- &dev.bus_num, &dev.dev_num);
- break;
+ if ((attr = sysfs_attr(e->d_name, "devnum")) != NULL)
+ dev.dev_num = strtoul(attr, NULL, 10);
- case 'P':
- sscanf(buf, "P: Vendor=%x ProdID=%x",
- &dev.vendor_id, &dev.product_id);
- break;
+ if ((attr = sysfs_attr(e->d_name, "idVendor")) != NULL)
+ dev.vendor_id = strtoul(attr, NULL, 16);
- case 'S':
- if (!strncmp(buf, "S: Manufacturer=", 17))
- snprintf(dev.vendor_name, sizeof(dev.vendor_name),
- "%s", buf+17);
- else if (!strncmp(buf, "S: Product=", 12))
- snprintf(dev.product_name, sizeof(dev.product_name),
- "%s", buf+12);
- break;
- }
+ if ((attr = sysfs_attr(e->d_name, "idProduct")) != NULL)
+ dev.product_id = strtoul(attr, NULL, 16);
- if (dev.product_name[0])
- return &dev;
- }
+ if ((attr = sysfs_attr(e->d_name, "manufacturer")) != NULL)
+ strcpy(dev.vendor_name, attr);
+
+ if ((attr = sysfs_attr(e->d_name, "product")) != NULL)
+ strcpy(dev.product_name, attr);
+
+ if (dev.bus_num && dev.dev_num && dev.vendor_id && dev.product_id)
+ return &dev;
return NULL;
}
static void list_devices(void)
{
- FILE *devs = open_devlist();
+ DIR *devs = opendir("/sys/bus/usb/devices");
struct usbentry *dev;
if (!devs)
@@ -152,14 +140,14 @@ static void list_devices(void)
dev->product_name);
}
- close_devlist(devs);
+ closedir(devs);
}
struct usbentry * find_device(int *bus, int *dev,
int *vid, int *pid,
const char *product)
{
- FILE *devs = open_devlist();
+ DIR *devs = opendir("/sys/bus/usb/devices");
struct usbentry *e, *match = NULL;
@@ -177,7 +165,7 @@ struct usbentry * find_device(int *bus, int *dev,
}
}
- close_devlist(devs);
+ closedir(devs);
return match;
}
@@ -185,10 +173,10 @@ struct usbentry * find_device(int *bus, int *dev,
static void reset_device(struct usbentry *dev)
{
int fd;
- char path[1024];
+ char path[PATH_MAX];
- snprintf(path, sizeof(path), "%s/%03d/%03d",
- usbfs, dev->bus_num, dev->dev_num);
+ snprintf(path, sizeof(path) - 1, "/dev/bus/usb/%03d/%03d",
+ dev->bus_num, dev->dev_num);
printf("Resetting %s ... ", dev->product_name);
@@ -213,12 +201,6 @@ int main(int argc, char **argv)
int id1, id2;
struct usbentry *dev;
- if (!find_usbfs())
- {
- fprintf(stderr, "Unable to find usbfs, is it mounted?\n");
- return 1;
- }
-
if ((argc == 2) && (sscanf(argv[1], "%3d/%3d", &id1, &id2) == 2))
{
dev = find_device(&id1, &id2, NULL, NULL, NULL);