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// SPDX-License-Identifier: GPL-2.0 /* * USB Serial Converter stuff * * Copyright (C) 1999 - 2012 * Greg Kroah-Hartman (greg@kroah.com) * * 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/sysrq.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 * @write_wait: a wait_queue_head_t used by the port. * @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; wait_queue_head_t write_wait; 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 * @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; unsigned char disconnected:1; unsigned char suspending: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 * 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); int (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 / int (write_room)(struct tty_struct tty); int (ioctl)(struct tty_struct tty, unsigned int cmd, unsigned long arg); int (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); 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) extern int usb_serial_register_drivers(struct usb_serial_driver const serial_drivers[], const char name, const struct usb_device_id id_table); extern void usb_serial_deregister_drivers(struct usb_serial_driver const serial_drivers[]); extern void usb_serial_port_softint(struct usb_serial_port port); extern int usb_serial_suspend(struct usb_interface intf, pm_message_t message); extern int usb_serial_resume(struct usb_interface intf); / USB Serial console functions / #ifdef CONFIG_USB_SERIAL_CONSOLE extern void usb_serial_console_init(int minor); extern void usb_serial_console_exit(void); extern 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 / extern struct usb_serial_port usb_serial_port_get_by_minor(unsigned int minor); extern void usb_serial_put(struct usb_serial serial); extern int usb_serial_generic_open(struct tty_struct tty, struct usb_serial_port port); extern int usb_serial_generic_write_start(struct usb_serial_port port, gfp_t mem_flags); extern int usb_serial_generic_write(struct tty_struct tty, struct usb_serial_port port, const unsigned char buf, int count); extern void usb_serial_generic_close(struct usb_serial_port port); extern int usb_serial_generic_resume(struct usb_serial serial); extern int usb_serial_generic_write_room(struct tty_struct tty); extern int usb_serial_generic_chars_in_buffer(struct tty_struct tty); extern void usb_serial_generic_wait_until_sent(struct tty_struct tty, long timeout); extern void usb_serial_generic_read_bulk_callback(struct urb urb); extern void usb_serial_generic_write_bulk_callback(struct urb urb); extern void usb_serial_generic_throttle(struct tty_struct tty); extern void usb_serial_generic_unthrottle(struct tty_struct tty); extern int usb_serial_generic_tiocmiwait(struct tty_struct tty, unsigned long arg); extern int usb_serial_generic_get_icount(struct tty_struct tty, struct serial_icounter_struct icount); extern int usb_serial_generic_register(void); extern void usb_serial_generic_deregister(void); extern int usb_serial_generic_submit_read_urbs(struct usb_serial_port port, gfp_t mem_flags); extern void usb_serial_generic_process_read_urb(struct urb urb); extern int usb_serial_generic_prepare_write_buffer(struct usb_serial_port port, void dest, size_t size); extern int usb_serial_handle_sysrq_char(struct usb_serial_port port, unsigned int ch); extern int usb_serial_handle_break(struct usb_serial_port port); extern void usb_serial_handle_dcd_change(struct usb_serial_port usb_port, struct tty_struct tty, unsigned int status); extern int usb_serial_bus_register(struct usb_serial_driver device); extern 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 inifinite 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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