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libusbhost: Add usb_device_get_name_from_unique_id() 

This allows converting from unique IDs to USB device names

Change-Id: I8e3b300790c01383aed8e3d4f547b54bcb7c2cd4
Signed-off-by: Mike Lockwood <lockwood@android.com>
This commit is contained in:
Mike Lockwood 2010-12-29 08:47:29 -05:00
parent 123538954b
commit 7d700f8bdc
2 changed files with 19 additions and 2 deletions
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11
include/usbhost/usbhost.h
View File

@ -96,13 +96,20 @@ int usb_device_get_fd(struct usb_device *device);
*/
const char* usb_device_get_name(struct usb_device *device);
/* Returns a unique ID for the device. Currently this is generated from the
* dev_name path.
/* Returns a unique ID for the device.
*Currently this is generated from the dev_name path.
*/
int usb_device_get_unique_id(struct usb_device *device);
/* Returns a unique ID for the device name.
* Currently this is generated from the device path.
*/
int usb_device_get_unique_id_from_name(const char* name);
/* Returns the device name for the unique ID.
* Call free() to deallocate the returned string */
char* usb_device_get_name_from_unique_id(int id);
/* Returns the USB vendor ID from the device descriptor for the USB device */
uint16_t usb_device_get_vendor_id(struct usb_device *device);

10
libusbhost/usbhost.c
View File

@ -57,6 +57,7 @@
#define USB_FS_DIR "/dev/bus/usb"
#define USB_FS_ID_SCANNER "/dev/bus/usb/%d/%d"
#define USB_FS_ID_FORMAT "/dev/bus/usb/%03d/%03d"
struct usb_host_context {
@ -314,6 +315,15 @@ int usb_device_get_unique_id_from_name(const char* name)
return bus * 1000 + dev;
}
char* usb_device_get_name_from_unique_id(int id)
{
int bus = id / 1000;
int dev = id % 1000;
char* result = (char *)calloc(1, strlen(USB_FS_ID_FORMAT));
snprintf(result, strlen(USB_FS_ID_FORMAT) - 1, USB_FS_ID_FORMAT, bus, dev);
return result;
}
uint16_t usb_device_get_vendor_id(struct usb_device *device)
{
struct usb_device_descriptor* desc = (struct usb_device_descriptor*)device->desc;