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1 | /* |
2 | * u_serial.h - interface to USB gadget "serial port"/TTY utilities | |
3 | * | |
4 | * Copyright (C) 2008 David Brownell | |
5 | * Copyright (C) 2008 by Nokia Corporation | |
6 | * | |
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. | |
10 | */ | |
11 | ||
12 | #ifndef __U_SERIAL_H | |
13 | #define __U_SERIAL_H | |
14 | ||
15 | #include <linux/usb/composite.h> | |
16 | #include <linux/usb/cdc.h> | |
17 | ||
18 | /* | |
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. | |
21 | * | |
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. | |
25 | * | |
26 | * REVISIT at least ACM could support tiocmget() if needed. | |
27 | * | |
28 | * REVISIT someday, allow multiplexing several TTYs over these endpoints. | |
29 | */ | |
30 | struct gserial { | |
31 | struct usb_function func; | |
32 | ||
33 | /* port is managed by gserial_{connect,disconnect} */ | |
34 | struct gs_port *ioport; | |
35 | ||
36 | struct usb_ep *in; | |
37 | struct usb_ep *out; | |
38 | ||
39 | /* REVISIT avoid this CDC-ACM support harder ... */ | |
40 | struct usb_cdc_line_coding port_line_coding; /* 9600-8-N-1 etc */ | |
41 | ||
42 | /* notification callbacks */ | |
43 | void (*connect)(struct gserial *p); | |
44 | void (*disconnect)(struct gserial *p); | |
45 | int (*send_break)(struct gserial *p, int duration); | |
46 | }; | |
47 | ||
48 | /* utilities to allocate/free request and buffer */ | |
49 | struct usb_request *gs_alloc_req(struct usb_ep *ep, unsigned len, gfp_t flags); | |
50 | void gs_free_req(struct usb_ep *, struct usb_request *req); | |
51 | ||
52 | /* port setup/teardown is handled by gadget driver */ | |
53 | int gserial_setup(struct usb_gadget *g, unsigned n_ports); | |
54 | void gserial_cleanup(void); | |
55 | ||
56 | /* connect/disconnect is handled by individual functions */ | |
57 | int gserial_connect(struct gserial *, u8 port_num); | |
58 | void gserial_disconnect(struct gserial *); | |
59 | ||
60 | /* functions are bound to configurations by a config or gadget driver */ | |
61 | int acm_bind_config(struct usb_configuration *c, u8 port_num); | |
62 | int gser_bind_config(struct usb_configuration *c, u8 port_num); | |
63 | int obex_bind_config(struct usb_configuration *c, u8 port_num); | |
64 | ||
65 | #endif /* __U_SERIAL_H */ |