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Add convenience function to find and open a device by USB VID+PID

Browse source 
Lots of libusb apps I write are simple test apps not intended to be real
apps. Having a function available to quickly locate my device will be
handy in such situations.
This commit is contained in:
Daniel Drake 2008-03-06 23:43:57 +00:00
parent 9cfdb494fc
commit 23f8fb8baf
3 changed files with 37 additions and 31 deletions
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32
examples/dpfp.c
View file

@ -81,36 +81,8 @@ static struct libusb_bulk_transfer irqtrf = {
static int find_dpfp_device(void)
{
struct libusb_device *dev;
struct libusb_device *found = NULL;
struct libusb_device **devs;
size_t i = 0;
int r;
r = libusb_get_device_list(&devs);
if (r < 0)
return r;
while ((dev = devs[i++]) != NULL) {
struct libusb_dev_descriptor *desc = libusb_device_get_descriptor(dev);
if (desc->idVendor == 0x05ba && desc->idProduct == 0x000a) {
found = dev;
break;
}
}
if (!found) {
r = -ENODEV;
goto out;
}
devh = libusb_open(dev);
if (!devh)
r = -EIO;
out:
libusb_free_device_list(devs, 1);
return r;
devh = libusb_open_device_with_vid_pid(0x05ba, 0x000a);
return devh ? 0 : -EIO;
}
static int print_f0_data(void)

31
libusb/core.c
View file

@ -385,6 +385,37 @@ API_EXPORTED struct libusb_dev_handle *libusb_open(struct libusb_device *dev)
return devh;
}
/* convenience function for finding a device with a particular vendor/product
* combination. has limitations and is hence not intended for use in "real
* applications": if multiple devices have the same VID+PID it'll only
* give you the first one, etc. */
API_EXPORTED struct libusb_dev_handle *libusb_open_device_with_vid_pid(
uint16_t vendor_id, uint16_t product_id)
{
struct libusb_device **devs;
struct libusb_device *found = NULL;
struct libusb_device *dev;
struct libusb_dev_handle *devh;
size_t i = 0;
if (libusb_get_device_list(&devs) < 0)
return NULL;
while ((dev = devs[i++]) != NULL) {
struct libusb_dev_descriptor *desc = libusb_device_get_descriptor(dev);
if (desc->idVendor == vendor_id && desc->idProduct == product_id) {
found = dev;
break;
}
}
if (found)
devh = libusb_open(found);
libusb_free_device_list(devs, 1);
return devh;
}
static void do_close(struct libusb_dev_handle *devh)
{
usbi_remove_pollfd(devh->fd);

5
libusb/libusb.h
View file

@ -231,10 +231,13 @@ void libusb_device_unref(libusb_device *dev);
libusb_dev_handle *libusb_open(libusb_device *dev);
void libusb_close(libusb_dev_handle *devh);
struct libusb_device *libusb_devh_get_device(libusb_dev_handle *devh);
libusb_device *libusb_devh_get_device(libusb_dev_handle *devh);
int libusb_claim_interface(libusb_dev_handle *dev, int iface);
int libusb_release_interface(libusb_dev_handle *dev, int iface);
libusb_dev_handle *libusb_open_device_with_vid_pid(uint16_t vendor_id,
uint16_t product_id);
/* async I/O */
libusb_urb_handle *libusb_async_control_transfer(libusb_dev_handle *devh,