// SPDX-License-Identifier: GPL-2.0+ /* * cdc-acm.c * * Copyright (c) 1999 Armin Fuerst <[email protected]> * Copyright (c) 1999 Pavel Machek <[email protected]> * Copyright (c) 1999 Johannes Erdfelt <[email protected]> * Copyright (c) 2000 Vojtech Pavlik <[email protected]> * Copyright (c) 2004 Oliver Neukum <[email protected]> * Copyright (c) 2005 David Kubicek <[email protected]> * Copyright (c) 2011 Johan Hovold <[email protected]> * * USB Abstract Control Model driver for USB modems and ISDN adapters * * Sponsored by SuSE */ #undef DEBUG #undef VERBOSE_DEBUG #include <linux/kernel.h> #include <linux/sched/signal.h> #include <linux/errno.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/log2.h> #include <linux/tty.h> #include <linux/serial.h> #include <linux/tty_driver.h> #include <linux/tty_flip.h> #include <linux/tty_ldisc.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/uaccess.h> #include <linux/usb.h> #include <linux/usb/cdc.h> #include <asm/byteorder.h> #include <asm/unaligned.h> #include <linux/idr.h> #include <linux/list.h> #include "cdc-acm.h" #define DRIVER_AUTHOR … #define DRIVER_DESC … static struct usb_driver acm_driver; static struct tty_driver *acm_tty_driver; static DEFINE_IDR(acm_minors); static DEFINE_MUTEX(acm_minors_lock); static void acm_tty_set_termios(struct tty_struct *tty, const struct ktermios *termios_old); /* * acm_minors accessors */ /* * Look up an ACM structure by minor. If found and not disconnected, increment * its refcount and return it with its mutex held. */ static struct acm *acm_get_by_minor(unsigned int minor) { … } /* * Try to find an available minor number and if found, associate it with 'acm'. */ static int acm_alloc_minor(struct acm *acm) { … } /* Release the minor number associated with 'acm'. */ static void acm_release_minor(struct acm *acm) { … } /* * Functions for ACM control messages. */ static int acm_ctrl_msg(struct acm *acm, int request, int value, void *buf, int len) { … } /* devices aren't required to support these requests. * the cdc acm descriptor tells whether they do... */ static inline int acm_set_control(struct acm *acm, int control) { … } #define acm_set_line(acm, line) … #define acm_send_break(acm, ms) … static void acm_poison_urbs(struct acm *acm) { … } static void acm_unpoison_urbs(struct acm *acm) { … } /* * Write buffer management. * All of these assume proper locks taken by the caller. */ static int acm_wb_alloc(struct acm *acm) { … } static int acm_wb_is_avail(struct acm *acm) { … } /* * Finish write. Caller must hold acm->write_lock */ static void acm_write_done(struct acm *acm, struct acm_wb *wb) { … } /* * Poke write. * * the caller is responsible for locking */ static int acm_start_wb(struct acm *acm, struct acm_wb *wb) { … } /* * attributes exported through sysfs */ static ssize_t bmCapabilities_show (struct device *dev, struct device_attribute *attr, char *buf) { … } static DEVICE_ATTR_RO(bmCapabilities); static ssize_t wCountryCodes_show (struct device *dev, struct device_attribute *attr, char *buf) { … } static DEVICE_ATTR_RO(wCountryCodes); static ssize_t iCountryCodeRelDate_show (struct device *dev, struct device_attribute *attr, char *buf) { … } static DEVICE_ATTR_RO(iCountryCodeRelDate); /* * Interrupt handlers for various ACM device responses */ static void acm_process_notification(struct acm *acm, unsigned char *buf) { … } /* control interface reports status changes with "interrupt" transfers */ static void acm_ctrl_irq(struct urb *urb) { … } static int acm_submit_read_urb(struct acm *acm, int index, gfp_t mem_flags) { … } static int acm_submit_read_urbs(struct acm *acm, gfp_t mem_flags) { … } static void acm_process_read_urb(struct acm *acm, struct urb *urb) { … } static void acm_read_bulk_callback(struct urb *urb) { … } /* data interface wrote those outgoing bytes */ static void acm_write_bulk(struct urb *urb) { … } static void acm_softint(struct work_struct *work) { … } /* * TTY handlers */ static int acm_tty_install(struct tty_driver *driver, struct tty_struct *tty) { … } static int acm_tty_open(struct tty_struct *tty, struct file *filp) { … } static void acm_port_dtr_rts(struct tty_port *port, bool active) { … } static int acm_port_activate(struct tty_port *port, struct tty_struct *tty) { … } static void acm_port_destruct(struct tty_port *port) { … } static void acm_port_shutdown(struct tty_port *port) { … } static void acm_tty_cleanup(struct tty_struct *tty) { … } static void acm_tty_hangup(struct tty_struct *tty) { … } static void acm_tty_close(struct tty_struct *tty, struct file *filp) { … } static ssize_t acm_tty_write(struct tty_struct *tty, const u8 *buf, size_t count) { … } static unsigned int acm_tty_write_room(struct tty_struct *tty) { … } static void acm_tty_flush_buffer(struct tty_struct *tty) { … } static unsigned int acm_tty_chars_in_buffer(struct tty_struct *tty) { … } static void acm_tty_throttle(struct tty_struct *tty) { … } static void acm_tty_unthrottle(struct tty_struct *tty) { … } static int acm_tty_break_ctl(struct tty_struct *tty, int state) { … } static int acm_tty_tiocmget(struct tty_struct *tty) { … } static int acm_tty_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) { … } static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss) { … } static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss) { … } static int wait_serial_change(struct acm *acm, unsigned long arg) { … } static int acm_tty_get_icount(struct tty_struct *tty, struct serial_icounter_struct *icount) { … } static int acm_tty_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg) { … } static void acm_tty_set_termios(struct tty_struct *tty, const struct ktermios *termios_old) { … } static const struct tty_port_operations acm_port_ops = …; /* * USB probe and disconnect routines. */ /* Little helpers: write/read buffers free */ static void acm_write_buffers_free(struct acm *acm) { … } static void acm_read_buffers_free(struct acm *acm) { … } /* Little helper: write buffers allocate */ static int acm_write_buffers_alloc(struct acm *acm) { … } static int acm_probe(struct usb_interface *intf, const struct usb_device_id *id) { … } static void acm_disconnect(struct usb_interface *intf) { … } #ifdef CONFIG_PM static int acm_suspend(struct usb_interface *intf, pm_message_t message) { … } static int acm_resume(struct usb_interface *intf) { … } static int acm_reset_resume(struct usb_interface *intf) { … } #endif /* CONFIG_PM */ static int acm_pre_reset(struct usb_interface *intf) { … } #define NOKIA_PCSUITE_ACM_INFO(x) … #define SAMSUNG_PCSUITE_ACM_INFO(x) … /* * USB driver structure. */ static const struct usb_device_id acm_ids[] = …; MODULE_DEVICE_TABLE(usb, acm_ids); static struct usb_driver acm_driver = …; /* * TTY driver structures. */ static const struct tty_operations acm_ops = …; /* * Init / exit. */ static int __init acm_init(void) { … } static void __exit acm_exit(void) { … } module_init(…) …; module_exit(acm_exit); MODULE_AUTHOR(…); MODULE_DESCRIPTION(…); MODULE_LICENSE(…) …; MODULE_ALIAS_CHARDEV_MAJOR(…);
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