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a17f04d4f2
The bInterfaceProtocol is hardcoded to USB_CDC_ACM_PROTO_AT_V25TER. This
will lead to problems with ModemManger which will gladly try to probe
that port as a modem if the gadget also has a network function.
ModemManager will try to send AT commands to the ACM port. Make the
bInterfaceProtocol configurable. For this, track the number of instances
and only allow write to the property if there are no intances (yet).
This will also set bFunctionProtocol to the same value, see commit
5c8db070b4 ("USB: Change acm_iad_descriptor bFunctionProtocol to
USB_CDC_ACM_PROTO_AT_V25TER") for more details.
Signed-off-by: Michael Walle <mwalle@kernel.org>
Link: https://lore.kernel.org/r/20240825180446.3757073-1-mwalle@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* u_serial.h - interface to USB gadget "serial port"/TTY utilities
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*
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* Copyright (C) 2008 David Brownell
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* Copyright (C) 2008 by Nokia Corporation
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*/
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#ifndef __U_SERIAL_H
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#define __U_SERIAL_H
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#include <linux/usb/composite.h>
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#include <linux/usb/cdc.h>
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#define MAX_U_SERIAL_PORTS 8
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struct f_serial_opts {
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struct usb_function_instance func_inst;
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u8 port_num;
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u8 protocol;
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struct mutex lock; /* protect instances */
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int instances;
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};
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/*
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* One non-multiplexed "serial" I/O port ... there can be several of these
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* on any given USB peripheral device, if it provides enough endpoints.
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*
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* The "u_serial" utility component exists to do one thing: manage TTY
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* style I/O using the USB peripheral endpoints listed here, including
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* hookups to sysfs and /dev for each logical "tty" device.
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*
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* REVISIT at least ACM could support tiocmget() if needed.
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*
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* REVISIT someday, allow multiplexing several TTYs over these endpoints.
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*/
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struct gserial {
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struct usb_function func;
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/* port is managed by gserial_{connect,disconnect} */
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struct gs_port *ioport;
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struct usb_ep *in;
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struct usb_ep *out;
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/* REVISIT avoid this CDC-ACM support harder ... */
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struct usb_cdc_line_coding port_line_coding; /* 9600-8-N-1 etc */
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/* notification callbacks */
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void (*connect)(struct gserial *p);
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void (*disconnect)(struct gserial *p);
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int (*send_break)(struct gserial *p, int duration);
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};
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/* utilities to allocate/free request and buffer */
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struct usb_request *gs_alloc_req(struct usb_ep *ep, unsigned len, gfp_t flags);
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void gs_free_req(struct usb_ep *, struct usb_request *req);
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/* management of individual TTY ports */
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int gserial_alloc_line_no_console(unsigned char *port_line);
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int gserial_alloc_line(unsigned char *port_line);
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void gserial_free_line(unsigned char port_line);
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#ifdef CONFIG_U_SERIAL_CONSOLE
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ssize_t gserial_set_console(unsigned char port_num, const char *page, size_t count);
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ssize_t gserial_get_console(unsigned char port_num, char *page);
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#endif /* CONFIG_U_SERIAL_CONSOLE */
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/* connect/disconnect is handled by individual functions */
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int gserial_connect(struct gserial *, u8 port_num);
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void gserial_disconnect(struct gserial *);
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void gserial_suspend(struct gserial *p);
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void gserial_resume(struct gserial *p);
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#endif /* __U_SERIAL_H */
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