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// SPDX-License-Identifier: GPL-2.0
/*
* USB Serial Converter stuff
*
* Copyright (C) 1999 - 2012
* Greg Kroah-Hartman ([email protected])
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
*/
#ifndef __LINUX_USB_SERIAL_H
#define __LINUX_USB_SERIAL_H
#include <linux/kref.h>
#include <linux/mutex.h>
#include <linux/serial.h>
#include <linux/kfifo.h>
/* The maximum number of ports one device can grab at once */
#define MAX_NUM_PORTS 16
/* USB serial flags */
#define USB_SERIAL_WRITE_BUSY 0
#define USB_SERIAL_THROTTLED 1
/**
* usb_serial_port: structure for the specific ports of a device.
* @serial: pointer back to the struct usb_serial owner of this port.
* @port: pointer to the corresponding tty_port for this port.
* @lock: spinlock to grab when updating portions of this structure.
* @minor: the minor number of the port
* @port_number: the struct usb_serial port number of this port (starts at 0)
* @interrupt_in_buffer: pointer to the interrupt in buffer for this port.
* @interrupt_in_urb: pointer to the interrupt in struct urb for this port.
* @interrupt_in_endpointAddress: endpoint address for the interrupt in pipe
* for this port.
* @interrupt_out_buffer: pointer to the interrupt out buffer for this port.
* @interrupt_out_size: the size of the interrupt_out_buffer, in bytes.
* @interrupt_out_urb: pointer to the interrupt out struct urb for this port.
* @interrupt_out_endpointAddress: endpoint address for the interrupt out pipe
* for this port.
* @bulk_in_buffer: pointer to the bulk in buffer for this port.
* @bulk_in_size: the size of the bulk_in_buffer, in bytes.
* @read_urb: pointer to the bulk in struct urb for this port.
* @bulk_in_endpointAddress: endpoint address for the bulk in pipe for this
* port.
* @bulk_in_buffers: pointers to the bulk in buffers for this port
* @read_urbs: pointers to the bulk in urbs for this port
* @read_urbs_free: status bitmap the for bulk in urbs
* @bulk_out_buffer: pointer to the bulk out buffer for this port.
* @bulk_out_size: the size of the bulk_out_buffer, in bytes.
* @write_urb: pointer to the bulk out struct urb for this port.
* @write_fifo: kfifo used to buffer outgoing data
* @bulk_out_buffers: pointers to the bulk out buffers for this port
* @write_urbs: pointers to the bulk out urbs for this port
* @write_urbs_free: status bitmap the for bulk out urbs
* @icount: interrupt counters
* @tx_bytes: number of bytes currently in host stack queues
* @bulk_out_endpointAddress: endpoint address for the bulk out pipe for this
* port.
* @flags: usb serial port flags
* @work: work queue entry for the line discipline waking up.
* @dev: pointer to the serial device
*
* This structure is used by the usb-serial core and drivers for the specific
* ports of a device.
*/
struct usb_serial_port {
struct usb_serial *serial;
struct tty_port port;
spinlock_t lock;
u32 minor;
u8 port_number;
unsigned char *interrupt_in_buffer;
struct urb *interrupt_in_urb;
__u8 interrupt_in_endpointAddress;
unsigned char *interrupt_out_buffer;
int interrupt_out_size;
struct urb *interrupt_out_urb;
__u8 interrupt_out_endpointAddress;
unsigned char *bulk_in_buffer;
int bulk_in_size;
struct urb *read_urb;
__u8 bulk_in_endpointAddress;
unsigned char *bulk_in_buffers[2];
struct urb *read_urbs[2];
unsigned long read_urbs_free;
unsigned char *bulk_out_buffer;
int bulk_out_size;
struct urb *write_urb;
struct kfifo write_fifo;
unsigned char *bulk_out_buffers[2];
struct urb *write_urbs[2];
unsigned long write_urbs_free;
__u8 bulk_out_endpointAddress;
struct async_icount icount;
int tx_bytes;
unsigned long flags;
struct work_struct work;
unsigned long sysrq; /* sysrq timeout */
struct device dev;
};
#define to_usb_serial_port(d) container_of(d, struct usb_serial_port, dev)
/* get and set the port private data pointer helper functions */
static inline void *usb_get_serial_port_data(struct usb_serial_port *port)
{
return dev_get_drvdata(&port->dev);
}
static inline void usb_set_serial_port_data(struct usb_serial_port *port,
void *data)
{
dev_set_drvdata(&port->dev, data);
}
/**
* usb_serial - structure used by the usb-serial core for a device
* @dev: pointer to the struct usb_device for this device
* @type: pointer to the struct usb_serial_driver for this device
* @interface: pointer to the struct usb_interface for this device
* @sibling: pointer to the struct usb_interface of any sibling interface
* @suspend_count: number of suspended (sibling) interfaces
* @num_ports: the number of ports this device has
* @num_interrupt_in: number of interrupt in endpoints we have
* @num_interrupt_out: number of interrupt out endpoints we have
* @num_bulk_in: number of bulk in endpoints we have
* @num_bulk_out: number of bulk out endpoints we have
* @port: array of struct usb_serial_port structures for the different ports.
* @private: place to put any driver specific information that is needed. The
* usb-serial driver is required to manage this data, the usb-serial core
* will not touch this. Use usb_get_serial_data() and
* usb_set_serial_data() to access this.
*/
struct usb_serial {
struct usb_device *dev;
struct usb_serial_driver *type;
struct usb_interface *interface;
struct usb_interface *sibling;
unsigned int suspend_count;
unsigned char disconnected:1;
unsigned char attached:1;
unsigned char minors_reserved:1;
unsigned char num_ports;
unsigned char num_port_pointers;
unsigned char num_interrupt_in;
unsigned char num_interrupt_out;
unsigned char num_bulk_in;
unsigned char num_bulk_out;
struct usb_serial_port *port[MAX_NUM_PORTS];
struct kref kref;
struct mutex disc_mutex;
void *private;
};
#define to_usb_serial(d) container_of(d, struct usb_serial, kref)
/* get and set the serial private data pointer helper functions */
static inline void *usb_get_serial_data(struct usb_serial *serial)
{
return serial->private;
}
static inline void usb_set_serial_data(struct usb_serial *serial, void *data)
{
serial->private = data;
}
struct usb_serial_endpoints {
unsigned char num_bulk_in;
unsigned char num_bulk_out;
unsigned char num_interrupt_in;
unsigned char num_interrupt_out;
struct usb_endpoint_descriptor *bulk_in[MAX_NUM_PORTS];
struct usb_endpoint_descriptor *bulk_out[MAX_NUM_PORTS];
struct usb_endpoint_descriptor *interrupt_in[MAX_NUM_PORTS];
struct usb_endpoint_descriptor *interrupt_out[MAX_NUM_PORTS];
};
/**
* usb_serial_driver - describes a usb serial driver
* @description: pointer to a string that describes this driver. This string
* used in the syslog messages when a device is inserted or removed.
* @id_table: pointer to a list of usb_device_id structures that define all
* of the devices this structure can support.
* @num_ports: the number of different ports this device will have.
* @num_bulk_in: minimum number of bulk-in endpoints
* @num_bulk_out: minimum number of bulk-out endpoints
* @num_interrupt_in: minimum number of interrupt-in endpoints
* @num_interrupt_out: minimum number of interrupt-out endpoints
* @bulk_in_size: minimum number of bytes to allocate for bulk-in buffer
* (0 = end-point size)
* @bulk_out_size: bytes to allocate for bulk-out buffer (0 = end-point size)
* @calc_num_ports: pointer to a function to determine how many ports this
* device has dynamically. It can also be used to verify the number of
* endpoints or to modify the port-endpoint mapping. It will be called
* after the probe() callback is called, but before attach().
* @probe: pointer to the driver's probe function.
* This will be called when the device is inserted into the system,
* but before the device has been fully initialized by the usb_serial
* subsystem. Use this function to download any firmware to the device,
* or any other early initialization that might be needed.
* Return 0 to continue on with the initialization sequence. Anything
* else will abort it.
* @attach: pointer to the driver's attach function.
* This will be called when the struct usb_serial structure is fully
* set up. Do any local initialization of the device, or any private
* memory structure allocation at this point in time.
* @disconnect: pointer to the driver's disconnect function. This will be
* called when the device is unplugged or unbound from the driver.
* @release: pointer to the driver's release function. This will be called
* when the usb_serial data structure is about to be destroyed.
* @usb_driver: pointer to the struct usb_driver that controls this
* device. This is necessary to allow dynamic ids to be added to
* the driver from sysfs.
*
* This structure is defines a USB Serial driver. It provides all of
* the information that the USB serial core code needs. If the function
* pointers are defined, then the USB serial core code will call them when
* the corresponding tty port functions are called. If they are not
* called, the generic serial function will be used instead.
*
* The driver.owner field should be set to the module owner of this driver.
* The driver.name field should be set to the name of this driver (remember
* it will show up in sysfs, so it needs to be short and to the point.
* Using the module name is a good idea.)
*/
struct usb_serial_driver {
const char *description;
const struct usb_device_id *id_table;
struct list_head driver_list;
struct device_driver driver;
struct usb_driver *usb_driver;
struct usb_dynids dynids;
unsigned char num_ports;
unsigned char num_bulk_in;
unsigned char num_bulk_out;
unsigned char num_interrupt_in;
unsigned char num_interrupt_out;
size_t bulk_in_size;
size_t bulk_out_size;
int (*probe)(struct usb_serial *serial, const struct usb_device_id *id);
int (*attach)(struct usb_serial *serial);
int (*calc_num_ports)(struct usb_serial *serial,
struct usb_serial_endpoints *epds);
void (*disconnect)(struct usb_serial *serial);
void (*release)(struct usb_serial *serial);
int (*port_probe)(struct usb_serial_port *port);
void (*port_remove)(struct usb_serial_port *port);
int (*suspend)(struct usb_serial *serial, pm_message_t message);
int (*resume)(struct usb_serial *serial);
int (*reset_resume)(struct usb_serial *serial);
/* serial function calls */
/* Called by console and by the tty layer */
int (*open)(struct tty_struct *tty, struct usb_serial_port *port);
void (*close)(struct usb_serial_port *port);
int (*write)(struct tty_struct *tty, struct usb_serial_port *port,
const unsigned char *buf, int count);
/* Called only by the tty layer */
unsigned int (*write_room)(struct tty_struct *tty);
int (*ioctl)(struct tty_struct *tty,
unsigned int cmd, unsigned long arg);
void (*get_serial)(struct tty_struct *tty, struct serial_struct *ss);
int (*set_serial)(struct tty_struct *tty, struct serial_struct *ss);
void (*set_termios)(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old);
void (*break_ctl)(struct tty_struct *tty, int break_state);
unsigned int (*chars_in_buffer)(struct tty_struct *tty);
void (*wait_until_sent)(struct tty_struct *tty, long timeout);
bool (*tx_empty)(struct usb_serial_port *port);
void (*throttle)(struct tty_struct *tty);
void (*unthrottle)(struct tty_struct *tty);
int (*tiocmget)(struct tty_struct *tty);
int (*tiocmset)(struct tty_struct *tty,
unsigned int set, unsigned int clear);
int (*tiocmiwait)(struct tty_struct *tty, unsigned long arg);
int (*get_icount)(struct tty_struct *tty,
struct serial_icounter_struct *icount);
/* Called by the tty layer for port level work. There may or may not
be an attached tty at this point */
void (*dtr_rts)(struct usb_serial_port *port, int on);
int (*carrier_raised)(struct usb_serial_port *port);
/* Called by the usb serial hooks to allow the user to rework the
termios state */
void (*init_termios)(struct tty_struct *tty);
/* USB events */
void (*read_int_callback)(struct urb *urb);
void (*write_int_callback)(struct urb *urb);
void (*read_bulk_callback)(struct urb *urb);
void (*write_bulk_callback)(struct urb *urb);
/* Called by the generic read bulk callback */
void (*process_read_urb)(struct urb *urb);
/* Called by the generic write implementation */
int (*prepare_write_buffer)(struct usb_serial_port *port,
void *dest, size_t size);
};
#define to_usb_serial_driver(d) \
container_of(d, struct usb_serial_driver, driver)
int usb_serial_register_drivers(struct usb_serial_driver *const serial_drivers[],
const char *name, const struct usb_device_id *id_table);
void usb_serial_deregister_drivers(struct usb_serial_driver *const serial_drivers[]);
void usb_serial_port_softint(struct usb_serial_port *port);
int usb_serial_suspend(struct usb_interface *intf, pm_message_t message);
int usb_serial_resume(struct usb_interface *intf);
/* USB Serial console functions */
#ifdef CONFIG_USB_SERIAL_CONSOLE
void usb_serial_console_init(int minor);
void usb_serial_console_exit(void);
void usb_serial_console_disconnect(struct usb_serial *serial);
#else
static inline void usb_serial_console_init(int minor) { }
static inline void usb_serial_console_exit(void) { }
static inline void usb_serial_console_disconnect(struct usb_serial *serial) {}
#endif
/* Functions needed by other parts of the usbserial core */
struct usb_serial_port *usb_serial_port_get_by_minor(unsigned int minor);
void usb_serial_put(struct usb_serial *serial);
int usb_serial_claim_interface(struct usb_serial *serial, struct usb_interface *intf);
int usb_serial_generic_open(struct tty_struct *tty, struct usb_serial_port *port);
int usb_serial_generic_write_start(struct usb_serial_port *port, gfp_t mem_flags);
int usb_serial_generic_write(struct tty_struct *tty, struct usb_serial_port *port,
const unsigned char *buf, int count);
void usb_serial_generic_close(struct usb_serial_port *port);
int usb_serial_generic_resume(struct usb_serial *serial);
unsigned int usb_serial_generic_write_room(struct tty_struct *tty);
unsigned int usb_serial_generic_chars_in_buffer(struct tty_struct *tty);
void usb_serial_generic_wait_until_sent(struct tty_struct *tty, long timeout);
void usb_serial_generic_read_bulk_callback(struct urb *urb);
void usb_serial_generic_write_bulk_callback(struct urb *urb);
void usb_serial_generic_throttle(struct tty_struct *tty);
void usb_serial_generic_unthrottle(struct tty_struct *tty);
int usb_serial_generic_tiocmiwait(struct tty_struct *tty, unsigned long arg);
int usb_serial_generic_get_icount(struct tty_struct *tty, struct serial_icounter_struct *icount);
int usb_serial_generic_register(void);
void usb_serial_generic_deregister(void);
int usb_serial_generic_submit_read_urbs(struct usb_serial_port *port, gfp_t mem_flags);
void usb_serial_generic_process_read_urb(struct urb *urb);
int usb_serial_generic_prepare_write_buffer(struct usb_serial_port *port, void *dest, size_t size);
#if defined(CONFIG_USB_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
int usb_serial_handle_sysrq_char(struct usb_serial_port *port, unsigned int ch);
int usb_serial_handle_break(struct usb_serial_port *port);
#else
static inline int usb_serial_handle_sysrq_char(struct usb_serial_port *port, unsigned int ch)
{
return 0;
}
static inline int usb_serial_handle_break(struct usb_serial_port *port)
{
return 0;
}
#endif
void usb_serial_handle_dcd_change(struct usb_serial_port *usb_port,
struct tty_struct *tty, unsigned int status);
int usb_serial_bus_register(struct usb_serial_driver *device);
void usb_serial_bus_deregister(struct usb_serial_driver *device);
extern struct bus_type usb_serial_bus_type;
extern struct tty_driver *usb_serial_tty_driver;
static inline void usb_serial_debug_data(struct device *dev,
const char *function, int size,
const unsigned char *data)
{
dev_dbg(dev, "%s - length = %d, data = %*ph\n",
function, size, size, data);
}
/*
* Macro for reporting errors in write path to avoid infinite loop
* when port is used as a console.
*/
#define dev_err_console(usport, fmt, ...) \
do { \
static bool __print_once; \
struct usb_serial_port *__port = (usport); \
\
if (!__port->port.console || !__print_once) { \
__print_once = true; \
dev_err(&__port->dev, fmt, ##__VA_ARGS__); \
} \
} while (0)
/*
* module_usb_serial_driver() - Helper macro for registering a USB Serial driver
* @__serial_drivers: list of usb_serial drivers to register
* @__ids: all device ids that @__serial_drivers bind to
*
* Helper macro for USB serial drivers which do not do anything special
* in module init/exit. This eliminates a lot of boilerplate. Each
* module may only use this macro once, and calling it replaces
* module_init() and module_exit()
*
*/
#define usb_serial_module_driver(__name, __serial_drivers, __ids) \
static int __init usb_serial_module_init(void) \
{ \
return usb_serial_register_drivers(__serial_drivers, \
__name, __ids); \
} \
module_init(usb_serial_module_init); \
static void __exit usb_serial_module_exit(void) \
{ \
usb_serial_deregister_drivers(__serial_drivers); \
} \
module_exit(usb_serial_module_exit);
#define module_usb_serial_driver(__serial_drivers, __ids) \
usb_serial_module_driver(KBUILD_MODNAME, __serial_drivers, __ids)
#endif /* __LINUX_USB_SERIAL_H */
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