1 // SPDX-License-Identifier: GPL-2.0
3  * AIRcable USB Bluetooth Dongle Driver.
16  * The device simply need some stuff to understand data coming from the usb
29  * I have taken some info from a Greg Kroah-Hartman article:
43 #include <linux/usb.h>
44 #include <linux/usb/serial.h>
46 /* Vendor and Product ID */
63 #define DRIVER_DESC "AIRcable USB Driver"
65 /* ID table that will be registered with USB core */
70 MODULE_DEVICE_TABLE(usb, id_table);
72 static int aircable_prepare_write_buffer(struct usb_serial_port *port,  in aircable_prepare_write_buffer()  argument
78 	count = kfifo_out_locked(&port->write_fifo, buf + HCI_HEADER_LENGTH,  in aircable_prepare_write_buffer()
79 					size - HCI_HEADER_LENGTH, &port->lock);  in aircable_prepare_write_buffer()
91 	if (epds->num_bulk_out == 0) {  in aircable_calc_num_ports()
92 		dev_dbg(&serial->interface->dev,  in aircable_calc_num_ports()
93 			"ignoring interface with no bulk-out endpoints\n");  in aircable_calc_num_ports()
94 		return -ENODEV;  in aircable_calc_num_ports()
100 static int aircable_process_packet(struct usb_serial_port *port,  in aircable_process_packet()  argument
104 		len -= HCI_HEADER_LENGTH;  in aircable_process_packet()
108 		dev_dbg(&port->dev, "%s - malformed packet\n", __func__);  in aircable_process_packet()
112 	tty_insert_flip_string(&port->port, packet, len);  in aircable_process_packet()
119 	struct usb_serial_port *port = urb->context;  in aircable_process_read_urb()  local
120 	char *data = urb->transfer_buffer;  in aircable_process_read_urb()
126 	has_headers = (urb->actual_length > 2 && data[0] == RX_HEADER_0);  in aircable_process_read_urb()
129 	for (i = 0; i < urb->actual_length; i += HCI_COMPLETE_FRAME) {  in aircable_process_read_urb()
130 		len = min_t(int, urb->actual_length - i, HCI_COMPLETE_FRAME);  in aircable_process_read_urb()
131 		count += aircable_process_packet(port, has_headers,  in aircable_process_read_urb()
136 		tty_flip_buffer_push(&port->port);  in aircable_process_read_urb()