diff options
Diffstat (limited to 'drivers/usb/usb.c')
| -rw-r--r-- | drivers/usb/usb.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/drivers/usb/usb.c b/drivers/usb/usb.c index df8fe9b38..9b2d38b6f 100644 --- a/drivers/usb/usb.c +++ b/drivers/usb/usb.c @@ -1184,6 +1184,54 @@ void usb_init_root_hub(struct usb_device *dev) dev->actconfig = NULL; } +/* for returning string descriptors in UTF-16LE */ +static int ascii2utf (char *ascii, __u8 *utf, int utfmax) +{ + int retval; + + for (retval = 0; *ascii && utfmax > 1; utfmax -= 2, retval += 2) { + *utf++ = *ascii++ & 0x7f; + *utf++ = 0; + } + return retval; +} + +/* + * root_hub_string is used by each host controller's root hub code, + * so that they're identified consistently throughout the system. + */ +int usb_root_hub_string (int id, int serial, char *type, __u8 *data, int len) +{ + char buf [20]; + + // assert (len > (2 * (sizeof (buf) + 1))); + // assert (strlen (type) ~== 4); + + // language ids + if (id == 0) { + *data++ = 4; *data++ = 3; /* 4 bytes data */ + *data++ = 0; *data++ = 0; /* some language id */ + return 4; + + // serial number + } else if (id == 1) { + sprintf (buf, "%x", serial); + + // product description + } else if (id == 2) { + sprintf (buf, "USB %s Root Hub", type); + + // id 3 == vendor description + + // unsupported IDs --> "stall" + } else + return 0; + + data [0] = 2 + ascii2utf (buf, data + 2, len - 2); + data [1] = 3; + return data [0]; +} + /* * __usb_get_extra_descriptor() finds a descriptor of specific type in the * extra field of the interface and endpoint descriptor structs. @@ -1824,6 +1872,7 @@ EXPORT_SYMBOL(usb_interface_claimed); EXPORT_SYMBOL(usb_driver_release_interface); EXPORT_SYMBOL(usb_init_root_hub); +EXPORT_SYMBOL(usb_root_hub_string); EXPORT_SYMBOL(usb_new_device); EXPORT_SYMBOL(usb_connect); EXPORT_SYMBOL(usb_disconnect); |