Linux: Provide libusb_get_device_speed() data from sysfs

References #45.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>

diff --git a/libusb/os/linux_usbfs.c b/libusb/os/linux_usbfs.c
index a1825ad..ca75779 100644 (file)
--- a/libusb/os/linux_usbfs.c
+++ b/libusb/os/linux_usbfs.c
@@ -784,7 +784,7 @@ static int initialize_device(struct libusb_device *dev, uint8_t busnum,
        struct linux_device_priv *priv = __device_priv(dev);
        unsigned char *dev_buf;
        char path[PATH_MAX];
-       int fd;
+       int fd, speed;
        int active_config = 0;
        int device_configured = 1;
        ssize_t r;
@@ -797,6 +797,20 @@ static int initialize_device(struct libusb_device *dev, uint8_t busnum,
                if (!priv->sysfs_dir)
                        return LIBUSB_ERROR_NO_MEM;
                strcpy(priv->sysfs_dir, sysfs_dir);
+
+               /* Note speed can contain 1.5, in this case __read_sysfs_attr
+                  will stop parsing at the '.' and return 1 */
+               speed = __read_sysfs_attr(DEVICE_CTX(dev), sysfs_dir, "speed");
+               if (speed >= 0) {
+                       switch (speed) {
+                       case     1: dev->speed = LIBUSB_SPEED_LOW; break;
+                       case    12: dev->speed = LIBUSB_SPEED_FULL; break;
+                       case   480: dev->speed = LIBUSB_SPEED_HIGH; break;
+                       case  5000: dev->speed = LIBUSB_SPEED_SUPER; break;
+                       default:
+                               usbi_warn(DEVICE_CTX(dev), "Unknown device speed: %d Mbps", speed);
+                       }
+               }
        }
 
        if (sysfs_has_descriptors)