// SPDX-License-Identifier: GPL-2.0+ /* * USB Cypress M8 driver * * Copyright (C) 2004 * Lonnie Mendez ([email protected]) * Copyright (C) 2003,2004 * Neil Whelchel ([email protected]) * * See Documentation/usb/usb-serial.rst for more information on using this * driver * * See http://geocities.com/i0xox0i for information on this driver and the * earthmate usb device. */ /* Thanks to Neil Whelchel for writing the first cypress m8 implementation for linux. */ /* Thanks to cypress for providing references for the hid reports. */ /* Thanks to Jiang Zhang for providing links and for general help. */ /* Code originates and was built up from ftdi_sio, belkin, pl2303 and others.*/ #include <linux/kernel.h> #include <linux/errno.h> #include <linux/slab.h> #include <linux/tty.h> #include <linux/tty_driver.h> #include <linux/tty_flip.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/spinlock.h> #include <linux/usb.h> #include <linux/usb/serial.h> #include <linux/serial.h> #include <linux/kfifo.h> #include <linux/delay.h> #include <linux/uaccess.h> #include <asm/unaligned.h> #include "cypress_m8.h" static bool stats; static int interval; static bool unstable_bauds; #define DRIVER_AUTHOR … #define DRIVER_DESC … /* write buffer size defines */ #define CYPRESS_BUF_SIZE … static const struct usb_device_id id_table_earthmate[] = …; static const struct usb_device_id id_table_cyphidcomrs232[] = …; static const struct usb_device_id id_table_nokiaca42v2[] = …; static const struct usb_device_id id_table_combined[] = …; MODULE_DEVICE_TABLE(usb, id_table_combined); enum packet_format { … }; struct cypress_private { … }; /* function prototypes for the Cypress USB to serial device */ static int cypress_earthmate_port_probe(struct usb_serial_port *port); static int cypress_hidcom_port_probe(struct usb_serial_port *port); static int cypress_ca42v2_port_probe(struct usb_serial_port *port); static void cypress_port_remove(struct usb_serial_port *port); static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port); static void cypress_close(struct usb_serial_port *port); static void cypress_dtr_rts(struct usb_serial_port *port, int on); static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port, const unsigned char *buf, int count); static void cypress_send(struct usb_serial_port *port); static unsigned int cypress_write_room(struct tty_struct *tty); static void cypress_earthmate_init_termios(struct tty_struct *tty); static void cypress_set_termios(struct tty_struct *tty, struct usb_serial_port *port, const struct ktermios *old_termios); static int cypress_tiocmget(struct tty_struct *tty); static int cypress_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear); static unsigned int cypress_chars_in_buffer(struct tty_struct *tty); static void cypress_throttle(struct tty_struct *tty); static void cypress_unthrottle(struct tty_struct *tty); static void cypress_set_dead(struct usb_serial_port *port); static void cypress_read_int_callback(struct urb *urb); static void cypress_write_int_callback(struct urb *urb); static struct usb_serial_driver cypress_earthmate_device = …; static struct usb_serial_driver cypress_hidcom_device = …; static struct usb_serial_driver cypress_ca42v2_device = …; static struct usb_serial_driver * const serial_drivers[] = …; /***************************************************************************** * Cypress serial helper functions *****************************************************************************/ /* FRWD Dongle hidcom needs to skip reset and speed checks */ static inline bool is_frwd(struct usb_device *dev) { … } static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate) { … } /* This function can either set or retrieve the current serial line settings */ static int cypress_serial_control(struct tty_struct *tty, struct usb_serial_port *port, speed_t baud_rate, int data_bits, int stop_bits, int parity_enable, int parity_type, int reset, int cypress_request_type) { … } /* cypress_serial_control */ static void cypress_set_dead(struct usb_serial_port *port) { … } /***************************************************************************** * Cypress serial driver functions *****************************************************************************/ static int cypress_generic_port_probe(struct usb_serial_port *port) { … } static int cypress_earthmate_port_probe(struct usb_serial_port *port) { … } static int cypress_hidcom_port_probe(struct usb_serial_port *port) { … } static int cypress_ca42v2_port_probe(struct usb_serial_port *port) { … } static void cypress_port_remove(struct usb_serial_port *port) { … } static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port) { … } /* cypress_open */ static void cypress_dtr_rts(struct usb_serial_port *port, int on) { … } static void cypress_close(struct usb_serial_port *port) { … } /* cypress_close */ static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port, const unsigned char *buf, int count) { … } /* cypress_write */ static void cypress_send(struct usb_serial_port *port) { … } /* cypress_send */ /* returns how much space is available in the soft buffer */ static unsigned int cypress_write_room(struct tty_struct *tty) { … } static int cypress_tiocmget(struct tty_struct *tty) { … } static int cypress_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) { … } static void cypress_earthmate_init_termios(struct tty_struct *tty) { … } static void cypress_set_termios(struct tty_struct *tty, struct usb_serial_port *port, const struct ktermios *old_termios) { … } /* cypress_set_termios */ /* returns amount of data still left in soft buffer */ static unsigned int cypress_chars_in_buffer(struct tty_struct *tty) { … } static void cypress_throttle(struct tty_struct *tty) { … } static void cypress_unthrottle(struct tty_struct *tty) { … } static void cypress_read_int_callback(struct urb *urb) { … } /* cypress_read_int_callback */ static void cypress_write_int_callback(struct urb *urb) { … } module_usb_serial_driver(…); MODULE_AUTHOR(…); MODULE_DESCRIPTION(…); MODULE_LICENSE(…) …; module_param(stats, bool, 0644); MODULE_PARM_DESC(…) …; module_param(interval, int, 0644); MODULE_PARM_DESC(…) …; module_param(unstable_bauds, bool, 0644); MODULE_PARM_DESC(…) …;
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