2 * u_serial.h - interface to USB gadget "serial port"/TTY utilities
4 * Copyright (C) 2008 David Brownell
5 * Copyright (C) 2008 by Nokia Corporation
7 * This software is distributed under the terms of the GNU General
8 * Public License ("GPL") as published by the Free Software Foundation,
9 * either version 2 of that License or (at your option) any later version.
15 #include <linux/usb/composite.h>
16 #include <linux/usb/cdc.h>
19 * One non-multiplexed "serial" I/O port ... there can be several of these
20 * on any given USB peripheral device, if it provides enough endpoints.
22 * The "u_serial" utility component exists to do one thing: manage TTY
23 * style I/O using the USB peripheral endpoints listed here, including
24 * hookups to sysfs and /dev for each logical "tty" device.
26 * REVISIT at least ACM could support tiocmget() if needed.
28 * REVISIT someday, allow multiplexing several TTYs over these endpoints.
31 struct usb_function func;
33 /* port is managed by gserial_{connect,disconnect} */
34 struct gs_port *ioport;
38 struct usb_endpoint_descriptor *in_desc;
39 struct usb_endpoint_descriptor *out_desc;
41 /* REVISIT avoid this CDC-ACM support harder ... */
42 struct usb_cdc_line_coding port_line_coding; /* 9600-8-N-1 etc */
44 /* notification callbacks */
45 void (*connect)(struct gserial *p);
46 void (*disconnect)(struct gserial *p);
47 int (*send_break)(struct gserial *p, int duration);
50 /* utilities to allocate/free request and buffer */
51 struct usb_request *gs_alloc_req(struct usb_ep *ep, unsigned len, gfp_t flags);
52 void gs_free_req(struct usb_ep *, struct usb_request *req);
54 /* port setup/teardown is handled by gadget driver */
55 int gserial_setup(struct usb_gadget *g, unsigned n_ports);
56 void gserial_cleanup(void);
58 /* connect/disconnect is handled by individual functions */
59 int gserial_connect(struct gserial *, u8 port_num);
60 void gserial_disconnect(struct gserial *);
62 /* functions are bound to configurations by a config or gadget driver */
63 int acm_bind_config(struct usb_configuration *c, u8 port_num);
64 int gser_bind_config(struct usb_configuration *c, u8 port_num);
66 #endif /* __U_SERIAL_H */