hid_device * HID_API_EXPORT hid_open_path(const char *path)
{
int i;
hid_device *dev = NULL;
CFIndex num_devices;
dev = new_hid_device();
/* Set up the HID Manager if it hasn't been done */
if (!hid_mgr)
init_hid_manager();
CFSetRef device_set = IOHIDManagerCopyDevices(hid_mgr);
num_devices = CFSetGetCount(device_set);
IOHIDDeviceRef *device_array = calloc(num_devices, sizeof(IOHIDDeviceRef));
CFSetGetValues(device_set, (const void **) device_array);
for (i = 0; i < num_devices; i++)
{
char cbuf[BUF_LEN];
size_t len;
IOHIDDeviceRef os_dev = device_array[i];
len = make_path(os_dev, cbuf, sizeof(cbuf));
if (!strcmp(cbuf, path))
{
// Matched Paths. Open this Device.
IOReturn ret = IOHIDDeviceOpen(os_dev, kIOHIDOptionsTypeNone);
if (ret == kIOReturnSuccess)
{
char str[32];
CFIndex max_input_report_len;
free(device_array);
CFRelease(device_set);
dev->device_handle = os_dev;
/* Create the buffers for receiving data */
max_input_report_len = (CFIndex) get_max_report_length(os_dev);
dev->input_report_buf = calloc(max_input_report_len, sizeof(uint8_t));
/* Create the Run Loop Mode for this device.
printing the reference seems to work. */
sprintf(str, "%p", os_dev);
dev->run_loop_mode =
CFStringCreateWithCString(NULL, str, kCFStringEncodingASCII);
/* Attach the device to a Run Loop */
IOHIDDeviceScheduleWithRunLoop(os_dev, CFRunLoopGetCurrent(), dev->run_loop_mode);
IOHIDDeviceRegisterInputReportCallback(
os_dev, dev->input_report_buf, max_input_report_len,
&hid_report_callback, dev);
pthread_mutex_init(&dev->mutex, NULL);
return dev;
}
else
{
goto return_error;
}
}
}
return_error:
free(device_array);
CFRelease(device_set);
free(dev);
return NULL;
}
hid_device * HID_API_EXPORT hid_open_path(const char *path)
{
int i;
hid_device *dev = NULL;
CFIndex num_devices;
dev = new_hid_device();
/* Set up the HID Manager if it hasn't been done */
if (hid_init() < 0)
return NULL;
/* give the IOHIDManager a chance to update itself */
process_pending_events();
CFSetRef device_set = IOHIDManagerCopyDevices(hid_mgr);
num_devices = CFSetGetCount(device_set);
IOHIDDeviceRef *device_array = (IOHIDDeviceRef *)calloc(num_devices, sizeof(IOHIDDeviceRef));
CFSetGetValues(device_set, (const void **) device_array);
for (i = 0; i < num_devices; i++) {
char cbuf[BUF_LEN];
size_t len;
IOHIDDeviceRef os_dev = device_array[i];
len = make_path(os_dev, cbuf, sizeof(cbuf));
if (!strcmp(cbuf, path)) {
/* Matched Paths. Open this Device. */
IOReturn ret = IOHIDDeviceOpen(os_dev, kIOHIDOptionsTypeSeizeDevice);
if (ret == kIOReturnSuccess) {
char str[32];
free(device_array);
CFRetain(os_dev);
CFRelease(device_set);
dev->device_handle = os_dev;
/* Create the buffers for receiving data */
dev->max_input_report_len = (CFIndex) get_max_report_length(os_dev);
dev->input_report_buf = (uint8_t *)calloc(dev->max_input_report_len, sizeof(uint8_t));
/* Create the Run Loop Mode for this device.
printing the reference seems to work. */
sprintf(str, "HIDAPI_%p", os_dev);
dev->run_loop_mode =
CFStringCreateWithCString(NULL, str, kCFStringEncodingASCII);
/* Attach the device to a Run Loop */
IOHIDDeviceRegisterInputReportCallback(
os_dev, dev->input_report_buf, dev->max_input_report_len,
&hid_report_callback, dev);
IOHIDDeviceRegisterRemovalCallback(dev->device_handle, hid_device_removal_callback, dev);
/* Start the read thread */
pthread_create(&dev->thread, NULL, read_thread, dev);
/* Wait here for the read thread to be initialized. */
pthread_barrier_wait(&dev->barrier);
return dev;
}
else {
goto return_error;
}
}
}
return_error:
free(device_array);
CFRelease(device_set);
free_hid_device(dev);
return NULL;
}
