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