1467 lines
38 KiB
C
1467 lines
38 KiB
C
/*
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* cdc-acm.c
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*
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* Copyright (c) 1999 Armin Fuerst <fuerst@in.tum.de>
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* Copyright (c) 1999 Pavel Machek <pavel@suse.cz>
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* Copyright (c) 1999 Johannes Erdfelt <johannes@erdfelt.com>
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* Copyright (c) 2000 Vojtech Pavlik <vojtech@suse.cz>
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* Copyright (c) 2004 Oliver Neukum <oliver@neukum.name>
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* Copyright (c) 2005 David Kubicek <dave@awk.cz>
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*
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* USB Abstract Control Model driver for USB modems and ISDN adapters
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*
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* Sponsored by SuSE
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*
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* ChangeLog:
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* v0.9 - thorough cleaning, URBification, almost a rewrite
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* v0.10 - some more cleanups
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* v0.11 - fixed flow control, read error doesn't stop reads
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* v0.12 - added TIOCM ioctls, added break handling, made struct acm kmalloced
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* v0.13 - added termios, added hangup
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* v0.14 - sized down struct acm
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* v0.15 - fixed flow control again - characters could be lost
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* v0.16 - added code for modems with swapped data and control interfaces
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* v0.17 - added new style probing
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* v0.18 - fixed new style probing for devices with more configurations
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* v0.19 - fixed CLOCAL handling (thanks to Richard Shih-Ping Chan)
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* v0.20 - switched to probing on interface (rather than device) class
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* v0.21 - revert to probing on device for devices with multiple configs
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* v0.22 - probe only the control interface. if usbcore doesn't choose the
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* config we want, sysadmin changes bConfigurationValue in sysfs.
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* v0.23 - use softirq for rx processing, as needed by tty layer
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* v0.24 - change probe method to evaluate CDC union descriptor
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* v0.25 - downstream tasks paralelized to maximize throughput
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* v0.26 - multiple write urbs, writesize increased
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*/
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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; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#undef DEBUG
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/tty.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_flip.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <asm/uaccess.h>
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#include <linux/usb.h>
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#include <linux/usb/cdc.h>
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#include <asm/byteorder.h>
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#include <asm/unaligned.h>
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#include <linux/list.h>
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#include "cdc-acm.h"
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/*
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* Version Information
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*/
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#define DRIVER_VERSION "v0.26"
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#define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek"
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#define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters"
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static struct usb_driver acm_driver;
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static struct tty_driver *acm_tty_driver;
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static struct acm *acm_table[ACM_TTY_MINORS];
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static DEFINE_MUTEX(open_mutex);
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#define ACM_READY(acm) (acm && acm->dev && acm->used)
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/*
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* Functions for ACM control messages.
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*/
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static int acm_ctrl_msg(struct acm *acm, int request, int value, void *buf, int len)
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{
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int retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0),
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request, USB_RT_ACM, value,
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acm->control->altsetting[0].desc.bInterfaceNumber,
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buf, len, 5000);
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dbg("acm_control_msg: rq: 0x%02x val: %#x len: %#x result: %d", request, value, len, retval);
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return retval < 0 ? retval : 0;
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}
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/* devices aren't required to support these requests.
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* the cdc acm descriptor tells whether they do...
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*/
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#define acm_set_control(acm, control) \
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acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE, control, NULL, 0)
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#define acm_set_line(acm, line) \
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acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
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#define acm_send_break(acm, ms) \
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acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
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/*
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* Write buffer management.
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* All of these assume proper locks taken by the caller.
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*/
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static int acm_wb_alloc(struct acm *acm)
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{
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int i, wbn;
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struct acm_wb *wb;
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wbn = 0;
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i = 0;
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for (;;) {
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wb = &acm->wb[wbn];
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if (!wb->use) {
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wb->use = 1;
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return wbn;
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}
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wbn = (wbn + 1) % ACM_NW;
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if (++i >= ACM_NW)
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return -1;
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}
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}
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static int acm_wb_is_avail(struct acm *acm)
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{
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int i, n;
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n = ACM_NW;
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for (i = 0; i < ACM_NW; i++) {
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n -= acm->wb[i].use;
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}
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return n;
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}
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static inline int acm_wb_is_used(struct acm *acm, int wbn)
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{
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return acm->wb[wbn].use;
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}
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/*
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* Finish write.
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*/
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static void acm_write_done(struct acm *acm, struct acm_wb *wb)
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{
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unsigned long flags;
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spin_lock_irqsave(&acm->write_lock, flags);
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acm->write_ready = 1;
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wb->use = 0;
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acm->transmitting--;
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spin_unlock_irqrestore(&acm->write_lock, flags);
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}
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/*
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* Poke write.
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*
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* the caller is responsible for locking
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*/
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static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
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{
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int rc;
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acm->transmitting++;
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wb->urb->transfer_buffer = wb->buf;
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wb->urb->transfer_dma = wb->dmah;
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wb->urb->transfer_buffer_length = wb->len;
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wb->urb->dev = acm->dev;
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if ((rc = usb_submit_urb(wb->urb, GFP_ATOMIC)) < 0) {
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dbg("usb_submit_urb(write bulk) failed: %d", rc);
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acm_write_done(acm, wb);
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}
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return rc;
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}
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static int acm_write_start(struct acm *acm, int wbn)
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{
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unsigned long flags;
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struct acm_wb *wb;
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int rc;
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spin_lock_irqsave(&acm->write_lock, flags);
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if (!acm->dev) {
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spin_unlock_irqrestore(&acm->write_lock, flags);
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return -ENODEV;
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}
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if (!acm->write_ready) {
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spin_unlock_irqrestore(&acm->write_lock, flags);
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return 0; /* A white lie */
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}
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wb = &acm->wb[wbn];
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if(acm_wb_is_avail(acm) <= 1)
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acm->write_ready = 0;
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dbg("%s susp_count: %d", __func__, acm->susp_count);
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if (acm->susp_count) {
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acm->old_ready = acm->write_ready;
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acm->delayed_wb = wb;
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acm->write_ready = 0;
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schedule_work(&acm->waker);
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spin_unlock_irqrestore(&acm->write_lock, flags);
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return 0; /* A white lie */
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}
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usb_mark_last_busy(acm->dev);
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if (!acm_wb_is_used(acm, wbn)) {
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spin_unlock_irqrestore(&acm->write_lock, flags);
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return 0;
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}
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rc = acm_start_wb(acm, wb);
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spin_unlock_irqrestore(&acm->write_lock, flags);
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return rc;
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}
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/*
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* attributes exported through sysfs
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*/
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static ssize_t show_caps
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(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct usb_interface *intf = to_usb_interface(dev);
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struct acm *acm = usb_get_intfdata(intf);
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return sprintf(buf, "%d", acm->ctrl_caps);
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}
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static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL);
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static ssize_t show_country_codes
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(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct usb_interface *intf = to_usb_interface(dev);
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struct acm *acm = usb_get_intfdata(intf);
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memcpy(buf, acm->country_codes, acm->country_code_size);
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return acm->country_code_size;
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}
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static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL);
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static ssize_t show_country_rel_date
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(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct usb_interface *intf = to_usb_interface(dev);
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struct acm *acm = usb_get_intfdata(intf);
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return sprintf(buf, "%d", acm->country_rel_date);
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}
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static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL);
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/*
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* Interrupt handlers for various ACM device responses
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*/
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/* control interface reports status changes with "interrupt" transfers */
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static void acm_ctrl_irq(struct urb *urb)
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{
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struct acm *acm = urb->context;
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struct usb_cdc_notification *dr = urb->transfer_buffer;
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unsigned char *data;
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int newctrl;
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int retval;
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int status = urb->status;
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switch (status) {
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case 0:
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/* success */
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break;
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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/* this urb is terminated, clean up */
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dbg("%s - urb shutting down with status: %d", __func__, status);
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return;
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default:
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dbg("%s - nonzero urb status received: %d", __func__, status);
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goto exit;
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}
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if (!ACM_READY(acm))
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goto exit;
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data = (unsigned char *)(dr + 1);
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switch (dr->bNotificationType) {
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case USB_CDC_NOTIFY_NETWORK_CONNECTION:
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dbg("%s network", dr->wValue ? "connected to" : "disconnected from");
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break;
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case USB_CDC_NOTIFY_SERIAL_STATE:
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newctrl = get_unaligned_le16(data);
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if (acm->tty && !acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
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dbg("calling hangup");
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tty_hangup(acm->tty);
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}
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acm->ctrlin = newctrl;
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dbg("input control lines: dcd%c dsr%c break%c ring%c framing%c parity%c overrun%c",
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acm->ctrlin & ACM_CTRL_DCD ? '+' : '-', acm->ctrlin & ACM_CTRL_DSR ? '+' : '-',
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acm->ctrlin & ACM_CTRL_BRK ? '+' : '-', acm->ctrlin & ACM_CTRL_RI ? '+' : '-',
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acm->ctrlin & ACM_CTRL_FRAMING ? '+' : '-', acm->ctrlin & ACM_CTRL_PARITY ? '+' : '-',
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acm->ctrlin & ACM_CTRL_OVERRUN ? '+' : '-');
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break;
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default:
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dbg("unknown notification %d received: index %d len %d data0 %d data1 %d",
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dr->bNotificationType, dr->wIndex,
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dr->wLength, data[0], data[1]);
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break;
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}
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exit:
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usb_mark_last_busy(acm->dev);
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retval = usb_submit_urb (urb, GFP_ATOMIC);
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if (retval)
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err ("%s - usb_submit_urb failed with result %d",
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__func__, retval);
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}
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/* data interface returns incoming bytes, or we got unthrottled */
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static void acm_read_bulk(struct urb *urb)
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{
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struct acm_rb *buf;
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struct acm_ru *rcv = urb->context;
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struct acm *acm = rcv->instance;
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int status = urb->status;
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dbg("Entering acm_read_bulk with status %d", status);
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if (!ACM_READY(acm)) {
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dev_dbg(&acm->data->dev, "Aborting, acm not ready");
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return;
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}
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usb_mark_last_busy(acm->dev);
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if (status)
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dev_dbg(&acm->data->dev, "bulk rx status %d\n", status);
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buf = rcv->buffer;
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buf->size = urb->actual_length;
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if (likely(status == 0)) {
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spin_lock(&acm->read_lock);
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acm->processing++;
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list_add_tail(&rcv->list, &acm->spare_read_urbs);
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list_add_tail(&buf->list, &acm->filled_read_bufs);
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spin_unlock(&acm->read_lock);
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} else {
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/* we drop the buffer due to an error */
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spin_lock(&acm->read_lock);
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list_add_tail(&rcv->list, &acm->spare_read_urbs);
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list_add(&buf->list, &acm->spare_read_bufs);
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spin_unlock(&acm->read_lock);
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/* nevertheless the tasklet must be kicked unconditionally
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so the queue cannot dry up */
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}
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if (likely(!acm->susp_count))
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tasklet_schedule(&acm->urb_task);
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}
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static void acm_rx_tasklet(unsigned long _acm)
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{
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struct acm *acm = (void *)_acm;
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struct acm_rb *buf;
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struct tty_struct *tty = acm->tty;
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struct acm_ru *rcv;
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unsigned long flags;
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unsigned char throttled;
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dbg("Entering acm_rx_tasklet");
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if (!ACM_READY(acm))
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{
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dbg("acm_rx_tasklet: ACM not ready");
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return;
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}
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spin_lock_irqsave(&acm->throttle_lock, flags);
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throttled = acm->throttle;
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spin_unlock_irqrestore(&acm->throttle_lock, flags);
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if (throttled)
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{
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dbg("acm_rx_tasklet: throttled");
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return;
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}
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next_buffer:
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spin_lock_irqsave(&acm->read_lock, flags);
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if (list_empty(&acm->filled_read_bufs)) {
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spin_unlock_irqrestore(&acm->read_lock, flags);
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goto urbs;
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}
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buf = list_entry(acm->filled_read_bufs.next,
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struct acm_rb, list);
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list_del(&buf->list);
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spin_unlock_irqrestore(&acm->read_lock, flags);
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dbg("acm_rx_tasklet: procesing buf 0x%p, size = %d", buf, buf->size);
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tty_buffer_request_room(tty, buf->size);
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spin_lock_irqsave(&acm->throttle_lock, flags);
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throttled = acm->throttle;
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spin_unlock_irqrestore(&acm->throttle_lock, flags);
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if (!throttled)
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tty_insert_flip_string(tty, buf->base, buf->size);
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tty_flip_buffer_push(tty);
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if (throttled) {
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dbg("Throttling noticed");
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spin_lock_irqsave(&acm->read_lock, flags);
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list_add(&buf->list, &acm->filled_read_bufs);
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spin_unlock_irqrestore(&acm->read_lock, flags);
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return;
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}
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|
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spin_lock_irqsave(&acm->read_lock, flags);
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list_add(&buf->list, &acm->spare_read_bufs);
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spin_unlock_irqrestore(&acm->read_lock, flags);
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goto next_buffer;
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urbs:
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while (!list_empty(&acm->spare_read_bufs)) {
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spin_lock_irqsave(&acm->read_lock, flags);
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if (list_empty(&acm->spare_read_urbs)) {
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acm->processing = 0;
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spin_unlock_irqrestore(&acm->read_lock, flags);
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return;
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}
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rcv = list_entry(acm->spare_read_urbs.next,
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struct acm_ru, list);
|
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list_del(&rcv->list);
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spin_unlock_irqrestore(&acm->read_lock, flags);
|
|
|
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buf = list_entry(acm->spare_read_bufs.next,
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struct acm_rb, list);
|
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list_del(&buf->list);
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|
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rcv->buffer = buf;
|
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|
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usb_fill_bulk_urb(rcv->urb, acm->dev,
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acm->rx_endpoint,
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buf->base,
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acm->readsize,
|
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acm_read_bulk, rcv);
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rcv->urb->transfer_dma = buf->dma;
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rcv->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
|
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|
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/* This shouldn't kill the driver as unsuccessful URBs are returned to the
|
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free-urbs-pool and resubmited ASAP */
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spin_lock_irqsave(&acm->read_lock, flags);
|
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if (acm->susp_count || usb_submit_urb(rcv->urb, GFP_ATOMIC) < 0) {
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list_add(&buf->list, &acm->spare_read_bufs);
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list_add(&rcv->list, &acm->spare_read_urbs);
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acm->processing = 0;
|
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spin_unlock_irqrestore(&acm->read_lock, flags);
|
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return;
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} else {
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spin_unlock_irqrestore(&acm->read_lock, flags);
|
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dbg("acm_rx_tasklet: sending urb 0x%p, rcv 0x%p, buf 0x%p", rcv->urb, rcv, buf);
|
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}
|
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}
|
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spin_lock_irqsave(&acm->read_lock, flags);
|
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acm->processing = 0;
|
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spin_unlock_irqrestore(&acm->read_lock, flags);
|
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}
|
|
|
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/* data interface wrote those outgoing bytes */
|
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static void acm_write_bulk(struct urb *urb)
|
|
{
|
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struct acm *acm;
|
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struct acm_wb *wb = urb->context;
|
|
|
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dbg("Entering acm_write_bulk with status %d", urb->status);
|
|
|
|
acm = wb->instance;
|
|
acm_write_done(acm, wb);
|
|
if (ACM_READY(acm))
|
|
schedule_work(&acm->work);
|
|
}
|
|
|
|
static void acm_softint(struct work_struct *work)
|
|
{
|
|
struct acm *acm = container_of(work, struct acm, work);
|
|
dbg("Entering acm_softint.");
|
|
|
|
if (!ACM_READY(acm))
|
|
return;
|
|
tty_wakeup(acm->tty);
|
|
}
|
|
|
|
static void acm_waker(struct work_struct *waker)
|
|
{
|
|
struct acm *acm = container_of(waker, struct acm, waker);
|
|
long flags;
|
|
int rv;
|
|
|
|
rv = usb_autopm_get_interface(acm->control);
|
|
if (rv < 0) {
|
|
err("Autopm failure in %s", __func__);
|
|
return;
|
|
}
|
|
if (acm->delayed_wb) {
|
|
acm_start_wb(acm, acm->delayed_wb);
|
|
acm->delayed_wb = NULL;
|
|
}
|
|
spin_lock_irqsave(&acm->write_lock, flags);
|
|
acm->write_ready = acm->old_ready;
|
|
spin_unlock_irqrestore(&acm->write_lock, flags);
|
|
usb_autopm_put_interface(acm->control);
|
|
}
|
|
|
|
/*
|
|
* TTY handlers
|
|
*/
|
|
|
|
static int acm_tty_open(struct tty_struct *tty, struct file *filp)
|
|
{
|
|
struct acm *acm;
|
|
int rv = -EINVAL;
|
|
int i;
|
|
dbg("Entering acm_tty_open.");
|
|
|
|
mutex_lock(&open_mutex);
|
|
|
|
acm = acm_table[tty->index];
|
|
if (!acm || !acm->dev)
|
|
goto err_out;
|
|
else
|
|
rv = 0;
|
|
|
|
set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
|
|
tty->driver_data = acm;
|
|
acm->tty = tty;
|
|
|
|
/* force low_latency on so that our tty_push actually forces the data through,
|
|
otherwise it is scheduled, and with high data rates data can get lost. */
|
|
tty->low_latency = 1;
|
|
|
|
if (usb_autopm_get_interface(acm->control) < 0)
|
|
goto early_bail;
|
|
else
|
|
acm->control->needs_remote_wakeup = 1;
|
|
|
|
mutex_lock(&acm->mutex);
|
|
if (acm->used++) {
|
|
usb_autopm_put_interface(acm->control);
|
|
goto done;
|
|
}
|
|
|
|
|
|
acm->ctrlurb->dev = acm->dev;
|
|
if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
|
|
dbg("usb_submit_urb(ctrl irq) failed");
|
|
goto bail_out;
|
|
}
|
|
|
|
if (0 > acm_set_control(acm, acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS) &&
|
|
(acm->ctrl_caps & USB_CDC_CAP_LINE))
|
|
goto full_bailout;
|
|
usb_autopm_put_interface(acm->control);
|
|
|
|
INIT_LIST_HEAD(&acm->spare_read_urbs);
|
|
INIT_LIST_HEAD(&acm->spare_read_bufs);
|
|
INIT_LIST_HEAD(&acm->filled_read_bufs);
|
|
for (i = 0; i < acm->rx_buflimit; i++) {
|
|
list_add(&(acm->ru[i].list), &acm->spare_read_urbs);
|
|
}
|
|
for (i = 0; i < acm->rx_buflimit; i++) {
|
|
list_add(&(acm->rb[i].list), &acm->spare_read_bufs);
|
|
}
|
|
|
|
acm->throttle = 0;
|
|
|
|
tasklet_schedule(&acm->urb_task);
|
|
|
|
done:
|
|
err_out:
|
|
mutex_unlock(&acm->mutex);
|
|
mutex_unlock(&open_mutex);
|
|
return rv;
|
|
|
|
full_bailout:
|
|
usb_kill_urb(acm->ctrlurb);
|
|
bail_out:
|
|
usb_autopm_put_interface(acm->control);
|
|
acm->used--;
|
|
mutex_unlock(&acm->mutex);
|
|
early_bail:
|
|
mutex_unlock(&open_mutex);
|
|
return -EIO;
|
|
}
|
|
|
|
static void acm_tty_unregister(struct acm *acm)
|
|
{
|
|
int i,nr;
|
|
|
|
nr = acm->rx_buflimit;
|
|
tty_unregister_device(acm_tty_driver, acm->minor);
|
|
usb_put_intf(acm->control);
|
|
acm_table[acm->minor] = NULL;
|
|
usb_free_urb(acm->ctrlurb);
|
|
for (i = 0; i < ACM_NW; i++)
|
|
usb_free_urb(acm->wb[i].urb);
|
|
for (i = 0; i < nr; i++)
|
|
usb_free_urb(acm->ru[i].urb);
|
|
kfree(acm->country_codes);
|
|
kfree(acm);
|
|
}
|
|
|
|
static void acm_tty_close(struct tty_struct *tty, struct file *filp)
|
|
{
|
|
struct acm *acm = tty->driver_data;
|
|
int i,nr;
|
|
|
|
if (!acm || !acm->used)
|
|
return;
|
|
|
|
nr = acm->rx_buflimit;
|
|
mutex_lock(&open_mutex);
|
|
if (!--acm->used) {
|
|
if (acm->dev) {
|
|
usb_autopm_get_interface(acm->control);
|
|
acm_set_control(acm, acm->ctrlout = 0);
|
|
usb_kill_urb(acm->ctrlurb);
|
|
for (i = 0; i < ACM_NW; i++)
|
|
usb_kill_urb(acm->wb[i].urb);
|
|
for (i = 0; i < nr; i++)
|
|
usb_kill_urb(acm->ru[i].urb);
|
|
acm->control->needs_remote_wakeup = 0;
|
|
usb_autopm_put_interface(acm->control);
|
|
} else
|
|
acm_tty_unregister(acm);
|
|
}
|
|
mutex_unlock(&open_mutex);
|
|
}
|
|
|
|
static int acm_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
|
|
{
|
|
struct acm *acm = tty->driver_data;
|
|
int stat;
|
|
unsigned long flags;
|
|
int wbn;
|
|
struct acm_wb *wb;
|
|
|
|
dbg("Entering acm_tty_write to write %d bytes,", count);
|
|
|
|
if (!ACM_READY(acm))
|
|
return -EINVAL;
|
|
if (!count)
|
|
return 0;
|
|
|
|
spin_lock_irqsave(&acm->write_lock, flags);
|
|
if ((wbn = acm_wb_alloc(acm)) < 0) {
|
|
spin_unlock_irqrestore(&acm->write_lock, flags);
|
|
return 0;
|
|
}
|
|
wb = &acm->wb[wbn];
|
|
|
|
count = (count > acm->writesize) ? acm->writesize : count;
|
|
dbg("Get %d bytes...", count);
|
|
memcpy(wb->buf, buf, count);
|
|
wb->len = count;
|
|
spin_unlock_irqrestore(&acm->write_lock, flags);
|
|
|
|
if ((stat = acm_write_start(acm, wbn)) < 0)
|
|
return stat;
|
|
return count;
|
|
}
|
|
|
|
static int acm_tty_write_room(struct tty_struct *tty)
|
|
{
|
|
struct acm *acm = tty->driver_data;
|
|
if (!ACM_READY(acm))
|
|
return -EINVAL;
|
|
/*
|
|
* Do not let the line discipline to know that we have a reserve,
|
|
* or it might get too enthusiastic.
|
|
*/
|
|
return (acm->write_ready && acm_wb_is_avail(acm)) ? acm->writesize : 0;
|
|
}
|
|
|
|
static int acm_tty_chars_in_buffer(struct tty_struct *tty)
|
|
{
|
|
struct acm *acm = tty->driver_data;
|
|
if (!ACM_READY(acm))
|
|
return -EINVAL;
|
|
/*
|
|
* This is inaccurate (overcounts), but it works.
|
|
*/
|
|
return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
|
|
}
|
|
|
|
static void acm_tty_throttle(struct tty_struct *tty)
|
|
{
|
|
struct acm *acm = tty->driver_data;
|
|
if (!ACM_READY(acm))
|
|
return;
|
|
spin_lock_bh(&acm->throttle_lock);
|
|
acm->throttle = 1;
|
|
spin_unlock_bh(&acm->throttle_lock);
|
|
}
|
|
|
|
static void acm_tty_unthrottle(struct tty_struct *tty)
|
|
{
|
|
struct acm *acm = tty->driver_data;
|
|
if (!ACM_READY(acm))
|
|
return;
|
|
spin_lock_bh(&acm->throttle_lock);
|
|
acm->throttle = 0;
|
|
spin_unlock_bh(&acm->throttle_lock);
|
|
tasklet_schedule(&acm->urb_task);
|
|
}
|
|
|
|
static int acm_tty_break_ctl(struct tty_struct *tty, int state)
|
|
{
|
|
struct acm *acm = tty->driver_data;
|
|
int retval;
|
|
if (!ACM_READY(acm))
|
|
return -EINVAL;
|
|
retval = acm_send_break(acm, state ? 0xffff : 0);
|
|
if (retval < 0)
|
|
dbg("send break failed");
|
|
return retval;
|
|
}
|
|
|
|
static int acm_tty_tiocmget(struct tty_struct *tty, struct file *file)
|
|
{
|
|
struct acm *acm = tty->driver_data;
|
|
|
|
if (!ACM_READY(acm))
|
|
return -EINVAL;
|
|
|
|
return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
|
|
(acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
|
|
(acm->ctrlin & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
|
|
(acm->ctrlin & ACM_CTRL_RI ? TIOCM_RI : 0) |
|
|
(acm->ctrlin & ACM_CTRL_DCD ? TIOCM_CD : 0) |
|
|
TIOCM_CTS;
|
|
}
|
|
|
|
static int acm_tty_tiocmset(struct tty_struct *tty, struct file *file,
|
|
unsigned int set, unsigned int clear)
|
|
{
|
|
struct acm *acm = tty->driver_data;
|
|
unsigned int newctrl;
|
|
|
|
if (!ACM_READY(acm))
|
|
return -EINVAL;
|
|
|
|
newctrl = acm->ctrlout;
|
|
set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) | (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
|
|
clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) | (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
|
|
|
|
newctrl = (newctrl & ~clear) | set;
|
|
|
|
if (acm->ctrlout == newctrl)
|
|
return 0;
|
|
return acm_set_control(acm, acm->ctrlout = newctrl);
|
|
}
|
|
|
|
static int acm_tty_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct acm *acm = tty->driver_data;
|
|
|
|
if (!ACM_READY(acm))
|
|
return -EINVAL;
|
|
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
|
|
static const __u32 acm_tty_speed[] = {
|
|
0, 50, 75, 110, 134, 150, 200, 300, 600,
|
|
1200, 1800, 2400, 4800, 9600, 19200, 38400,
|
|
57600, 115200, 230400, 460800, 500000, 576000,
|
|
921600, 1000000, 1152000, 1500000, 2000000,
|
|
2500000, 3000000, 3500000, 4000000
|
|
};
|
|
|
|
static const __u8 acm_tty_size[] = {
|
|
5, 6, 7, 8
|
|
};
|
|
|
|
static void acm_tty_set_termios(struct tty_struct *tty, struct ktermios *termios_old)
|
|
{
|
|
struct acm *acm = tty->driver_data;
|
|
struct ktermios *termios = tty->termios;
|
|
struct usb_cdc_line_coding newline;
|
|
int newctrl = acm->ctrlout;
|
|
|
|
if (!ACM_READY(acm))
|
|
return;
|
|
|
|
newline.dwDTERate = cpu_to_le32p(acm_tty_speed +
|
|
(termios->c_cflag & CBAUD & ~CBAUDEX) + (termios->c_cflag & CBAUDEX ? 15 : 0));
|
|
newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
|
|
newline.bParityType = termios->c_cflag & PARENB ?
|
|
(termios->c_cflag & PARODD ? 1 : 2) + (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
|
|
newline.bDataBits = acm_tty_size[(termios->c_cflag & CSIZE) >> 4];
|
|
|
|
acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
|
|
|
|
if (!newline.dwDTERate) {
|
|
newline.dwDTERate = acm->line.dwDTERate;
|
|
newctrl &= ~ACM_CTRL_DTR;
|
|
} else newctrl |= ACM_CTRL_DTR;
|
|
|
|
if (newctrl != acm->ctrlout)
|
|
acm_set_control(acm, acm->ctrlout = newctrl);
|
|
|
|
if (memcmp(&acm->line, &newline, sizeof newline)) {
|
|
memcpy(&acm->line, &newline, sizeof newline);
|
|
dbg("set line: %d %d %d %d", le32_to_cpu(newline.dwDTERate),
|
|
newline.bCharFormat, newline.bParityType,
|
|
newline.bDataBits);
|
|
acm_set_line(acm, &acm->line);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* USB probe and disconnect routines.
|
|
*/
|
|
|
|
/* Little helpers: write/read buffers free */
|
|
static void acm_write_buffers_free(struct acm *acm)
|
|
{
|
|
int i;
|
|
struct acm_wb *wb;
|
|
|
|
for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
|
|
usb_buffer_free(acm->dev, acm->writesize, wb->buf, wb->dmah);
|
|
}
|
|
}
|
|
|
|
static void acm_read_buffers_free(struct acm *acm)
|
|
{
|
|
struct usb_device *usb_dev = interface_to_usbdev(acm->control);
|
|
int i, n = acm->rx_buflimit;
|
|
|
|
for (i = 0; i < n; i++)
|
|
usb_buffer_free(usb_dev, acm->readsize, acm->rb[i].base, acm->rb[i].dma);
|
|
}
|
|
|
|
/* Little helper: write buffers allocate */
|
|
static int acm_write_buffers_alloc(struct acm *acm)
|
|
{
|
|
int i;
|
|
struct acm_wb *wb;
|
|
|
|
for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
|
|
wb->buf = usb_buffer_alloc(acm->dev, acm->writesize, GFP_KERNEL,
|
|
&wb->dmah);
|
|
if (!wb->buf) {
|
|
while (i != 0) {
|
|
--i;
|
|
--wb;
|
|
usb_buffer_free(acm->dev, acm->writesize,
|
|
wb->buf, wb->dmah);
|
|
}
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int acm_probe (struct usb_interface *intf,
|
|
const struct usb_device_id *id)
|
|
{
|
|
struct usb_cdc_union_desc *union_header = NULL;
|
|
struct usb_cdc_country_functional_desc *cfd = NULL;
|
|
unsigned char *buffer = intf->altsetting->extra;
|
|
int buflen = intf->altsetting->extralen;
|
|
struct usb_interface *control_interface;
|
|
struct usb_interface *data_interface;
|
|
struct usb_endpoint_descriptor *epctrl;
|
|
struct usb_endpoint_descriptor *epread;
|
|
struct usb_endpoint_descriptor *epwrite;
|
|
struct usb_device *usb_dev = interface_to_usbdev(intf);
|
|
struct acm *acm;
|
|
int minor;
|
|
int ctrlsize,readsize;
|
|
u8 *buf;
|
|
u8 ac_management_function = 0;
|
|
u8 call_management_function = 0;
|
|
int call_interface_num = -1;
|
|
int data_interface_num;
|
|
unsigned long quirks;
|
|
int num_rx_buf;
|
|
int i;
|
|
|
|
/* normal quirks */
|
|
quirks = (unsigned long)id->driver_info;
|
|
num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
|
|
|
|
/* handle quirks deadly to normal probing*/
|
|
if (quirks == NO_UNION_NORMAL) {
|
|
data_interface = usb_ifnum_to_if(usb_dev, 1);
|
|
control_interface = usb_ifnum_to_if(usb_dev, 0);
|
|
goto skip_normal_probe;
|
|
}
|
|
|
|
/* normal probing*/
|
|
if (!buffer) {
|
|
err("Weird descriptor references\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!buflen) {
|
|
if (intf->cur_altsetting->endpoint->extralen && intf->cur_altsetting->endpoint->extra) {
|
|
dev_dbg(&intf->dev,"Seeking extra descriptors on endpoint\n");
|
|
buflen = intf->cur_altsetting->endpoint->extralen;
|
|
buffer = intf->cur_altsetting->endpoint->extra;
|
|
} else {
|
|
err("Zero length descriptor references\n");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
while (buflen > 0) {
|
|
if (buffer [1] != USB_DT_CS_INTERFACE) {
|
|
err("skipping garbage\n");
|
|
goto next_desc;
|
|
}
|
|
|
|
switch (buffer [2]) {
|
|
case USB_CDC_UNION_TYPE: /* we've found it */
|
|
if (union_header) {
|
|
err("More than one union descriptor, skipping ...");
|
|
goto next_desc;
|
|
}
|
|
union_header = (struct usb_cdc_union_desc *)
|
|
buffer;
|
|
break;
|
|
case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
|
|
cfd = (struct usb_cdc_country_functional_desc *)buffer;
|
|
break;
|
|
case USB_CDC_HEADER_TYPE: /* maybe check version */
|
|
break; /* for now we ignore it */
|
|
case USB_CDC_ACM_TYPE:
|
|
ac_management_function = buffer[3];
|
|
break;
|
|
case USB_CDC_CALL_MANAGEMENT_TYPE:
|
|
call_management_function = buffer[3];
|
|
call_interface_num = buffer[4];
|
|
if ((call_management_function & 3) != 3)
|
|
err("This device cannot do calls on its own. It is no modem.");
|
|
break;
|
|
default:
|
|
/* there are LOTS more CDC descriptors that
|
|
* could legitimately be found here.
|
|
*/
|
|
dev_dbg(&intf->dev, "Ignoring descriptor: "
|
|
"type %02x, length %d\n",
|
|
buffer[2], buffer[0]);
|
|
break;
|
|
}
|
|
next_desc:
|
|
buflen -= buffer[0];
|
|
buffer += buffer[0];
|
|
}
|
|
|
|
if (!union_header) {
|
|
if (call_interface_num > 0) {
|
|
dev_dbg(&intf->dev,"No union descriptor, using call management descriptor\n");
|
|
data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
|
|
control_interface = intf;
|
|
} else {
|
|
dev_dbg(&intf->dev,"No union descriptor, giving up\n");
|
|
return -ENODEV;
|
|
}
|
|
} else {
|
|
control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
|
|
data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
|
|
if (!control_interface || !data_interface) {
|
|
dev_dbg(&intf->dev,"no interfaces\n");
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
|
|
if (data_interface_num != call_interface_num)
|
|
dev_dbg(&intf->dev,"Separate call control interface. That is not fully supported.\n");
|
|
|
|
skip_normal_probe:
|
|
|
|
/*workaround for switched interfaces */
|
|
if (data_interface->cur_altsetting->desc.bInterfaceClass != CDC_DATA_INTERFACE_TYPE) {
|
|
if (control_interface->cur_altsetting->desc.bInterfaceClass == CDC_DATA_INTERFACE_TYPE) {
|
|
struct usb_interface *t;
|
|
dev_dbg(&intf->dev,"Your device has switched interfaces.\n");
|
|
|
|
t = control_interface;
|
|
control_interface = data_interface;
|
|
data_interface = t;
|
|
} else {
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
/* Accept probe requests only for the control interface */
|
|
if (intf != control_interface)
|
|
return -ENODEV;
|
|
|
|
if (usb_interface_claimed(data_interface)) { /* valid in this context */
|
|
dev_dbg(&intf->dev,"The data interface isn't available\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
|
|
if (data_interface->cur_altsetting->desc.bNumEndpoints < 2)
|
|
return -EINVAL;
|
|
|
|
epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
|
|
epread = &data_interface->cur_altsetting->endpoint[0].desc;
|
|
epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
|
|
|
|
|
|
/* workaround for switched endpoints */
|
|
if (!usb_endpoint_dir_in(epread)) {
|
|
/* descriptors are swapped */
|
|
struct usb_endpoint_descriptor *t;
|
|
dev_dbg(&intf->dev,"The data interface has switched endpoints\n");
|
|
|
|
t = epread;
|
|
epread = epwrite;
|
|
epwrite = t;
|
|
}
|
|
dbg("interfaces are valid");
|
|
for (minor = 0; minor < ACM_TTY_MINORS && acm_table[minor]; minor++);
|
|
|
|
if (minor == ACM_TTY_MINORS) {
|
|
err("no more free acm devices");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (!(acm = kzalloc(sizeof(struct acm), GFP_KERNEL))) {
|
|
dev_dbg(&intf->dev, "out of memory (acm kzalloc)\n");
|
|
goto alloc_fail;
|
|
}
|
|
|
|
ctrlsize = le16_to_cpu(epctrl->wMaxPacketSize);
|
|
readsize = le16_to_cpu(epread->wMaxPacketSize)* ( quirks == SINGLE_RX_URB ? 1 : 2);
|
|
acm->writesize = le16_to_cpu(epwrite->wMaxPacketSize) * 20;
|
|
acm->control = control_interface;
|
|
acm->data = data_interface;
|
|
acm->minor = minor;
|
|
acm->dev = usb_dev;
|
|
acm->ctrl_caps = ac_management_function;
|
|
acm->ctrlsize = ctrlsize;
|
|
acm->readsize = readsize;
|
|
acm->rx_buflimit = num_rx_buf;
|
|
acm->urb_task.func = acm_rx_tasklet;
|
|
acm->urb_task.data = (unsigned long) acm;
|
|
INIT_WORK(&acm->work, acm_softint);
|
|
INIT_WORK(&acm->waker, acm_waker);
|
|
spin_lock_init(&acm->throttle_lock);
|
|
spin_lock_init(&acm->write_lock);
|
|
spin_lock_init(&acm->read_lock);
|
|
mutex_init(&acm->mutex);
|
|
acm->write_ready = 1;
|
|
acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
|
|
|
|
buf = usb_buffer_alloc(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
|
|
if (!buf) {
|
|
dev_dbg(&intf->dev, "out of memory (ctrl buffer alloc)\n");
|
|
goto alloc_fail2;
|
|
}
|
|
acm->ctrl_buffer = buf;
|
|
|
|
if (acm_write_buffers_alloc(acm) < 0) {
|
|
dev_dbg(&intf->dev, "out of memory (write buffer alloc)\n");
|
|
goto alloc_fail4;
|
|
}
|
|
|
|
acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
|
|
if (!acm->ctrlurb) {
|
|
dev_dbg(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
|
|
goto alloc_fail5;
|
|
}
|
|
for (i = 0; i < num_rx_buf; i++) {
|
|
struct acm_ru *rcv = &(acm->ru[i]);
|
|
|
|
if (!(rcv->urb = usb_alloc_urb(0, GFP_KERNEL))) {
|
|
dev_dbg(&intf->dev, "out of memory (read urbs usb_alloc_urb)\n");
|
|
goto alloc_fail7;
|
|
}
|
|
|
|
rcv->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
|
|
rcv->instance = acm;
|
|
}
|
|
for (i = 0; i < num_rx_buf; i++) {
|
|
struct acm_rb *buf = &(acm->rb[i]);
|
|
|
|
if (!(buf->base = usb_buffer_alloc(acm->dev, readsize, GFP_KERNEL, &buf->dma))) {
|
|
dev_dbg(&intf->dev, "out of memory (read bufs usb_buffer_alloc)\n");
|
|
goto alloc_fail7;
|
|
}
|
|
}
|
|
for(i = 0; i < ACM_NW; i++)
|
|
{
|
|
struct acm_wb *snd = &(acm->wb[i]);
|
|
|
|
if (!(snd->urb = usb_alloc_urb(0, GFP_KERNEL))) {
|
|
dev_dbg(&intf->dev, "out of memory (write urbs usb_alloc_urb)");
|
|
goto alloc_fail7;
|
|
}
|
|
|
|
usb_fill_bulk_urb(snd->urb, usb_dev, usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
|
|
NULL, acm->writesize, acm_write_bulk, snd);
|
|
snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
|
|
snd->instance = acm;
|
|
}
|
|
|
|
usb_set_intfdata (intf, acm);
|
|
|
|
i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
|
|
if (i < 0)
|
|
goto alloc_fail8;
|
|
|
|
if (cfd) { /* export the country data */
|
|
acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
|
|
if (!acm->country_codes)
|
|
goto skip_countries;
|
|
acm->country_code_size = cfd->bLength - 4;
|
|
memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0, cfd->bLength - 4);
|
|
acm->country_rel_date = cfd->iCountryCodeRelDate;
|
|
|
|
i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
|
|
if (i < 0) {
|
|
kfree(acm->country_codes);
|
|
goto skip_countries;
|
|
}
|
|
|
|
i = device_create_file(&intf->dev, &dev_attr_iCountryCodeRelDate);
|
|
if (i < 0) {
|
|
kfree(acm->country_codes);
|
|
goto skip_countries;
|
|
}
|
|
}
|
|
|
|
skip_countries:
|
|
usb_fill_int_urb(acm->ctrlurb, usb_dev, usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
|
|
acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm, epctrl->bInterval);
|
|
acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
|
|
acm->ctrlurb->transfer_dma = acm->ctrl_dma;
|
|
|
|
dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
|
|
|
|
acm_set_control(acm, acm->ctrlout);
|
|
|
|
acm->line.dwDTERate = cpu_to_le32(9600);
|
|
acm->line.bDataBits = 8;
|
|
acm_set_line(acm, &acm->line);
|
|
|
|
usb_driver_claim_interface(&acm_driver, data_interface, acm);
|
|
|
|
usb_get_intf(control_interface);
|
|
tty_register_device(acm_tty_driver, minor, &control_interface->dev);
|
|
|
|
acm_table[minor] = acm;
|
|
|
|
return 0;
|
|
alloc_fail8:
|
|
for (i = 0; i < ACM_NW; i++)
|
|
usb_free_urb(acm->wb[i].urb);
|
|
alloc_fail7:
|
|
acm_read_buffers_free(acm);
|
|
for (i = 0; i < num_rx_buf; i++)
|
|
usb_free_urb(acm->ru[i].urb);
|
|
usb_free_urb(acm->ctrlurb);
|
|
alloc_fail5:
|
|
acm_write_buffers_free(acm);
|
|
alloc_fail4:
|
|
usb_buffer_free(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
|
|
alloc_fail2:
|
|
kfree(acm);
|
|
alloc_fail:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void stop_data_traffic(struct acm *acm)
|
|
{
|
|
int i;
|
|
dbg("Entering stop_data_traffic");
|
|
|
|
tasklet_disable(&acm->urb_task);
|
|
|
|
usb_kill_urb(acm->ctrlurb);
|
|
for(i = 0; i < ACM_NW; i++)
|
|
usb_kill_urb(acm->wb[i].urb);
|
|
for (i = 0; i < acm->rx_buflimit; i++)
|
|
usb_kill_urb(acm->ru[i].urb);
|
|
|
|
tasklet_enable(&acm->urb_task);
|
|
|
|
cancel_work_sync(&acm->work);
|
|
cancel_work_sync(&acm->waker);
|
|
}
|
|
|
|
static void acm_disconnect(struct usb_interface *intf)
|
|
{
|
|
struct acm *acm = usb_get_intfdata(intf);
|
|
struct usb_device *usb_dev = interface_to_usbdev(intf);
|
|
|
|
mutex_lock(&open_mutex);
|
|
if (!acm || !acm->dev) {
|
|
mutex_unlock(&open_mutex);
|
|
return;
|
|
}
|
|
if (acm->country_codes){
|
|
device_remove_file(&acm->control->dev,
|
|
&dev_attr_wCountryCodes);
|
|
device_remove_file(&acm->control->dev,
|
|
&dev_attr_iCountryCodeRelDate);
|
|
}
|
|
device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
|
|
acm->dev = NULL;
|
|
usb_set_intfdata(acm->control, NULL);
|
|
usb_set_intfdata(acm->data, NULL);
|
|
|
|
stop_data_traffic(acm);
|
|
|
|
acm_write_buffers_free(acm);
|
|
usb_buffer_free(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
|
|
acm_read_buffers_free(acm);
|
|
|
|
usb_driver_release_interface(&acm_driver, intf == acm->control ?
|
|
acm->data : acm->control);
|
|
|
|
if (!acm->used) {
|
|
acm_tty_unregister(acm);
|
|
mutex_unlock(&open_mutex);
|
|
return;
|
|
}
|
|
|
|
mutex_unlock(&open_mutex);
|
|
|
|
if (acm->tty)
|
|
tty_hangup(acm->tty);
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int acm_suspend(struct usb_interface *intf, pm_message_t message)
|
|
{
|
|
struct acm *acm = usb_get_intfdata(intf);
|
|
int cnt;
|
|
|
|
if (acm->dev->auto_pm) {
|
|
int b;
|
|
|
|
spin_lock_irq(&acm->read_lock);
|
|
spin_lock(&acm->write_lock);
|
|
b = acm->processing + acm->transmitting;
|
|
spin_unlock(&acm->write_lock);
|
|
spin_unlock_irq(&acm->read_lock);
|
|
if (b)
|
|
return -EBUSY;
|
|
}
|
|
|
|
spin_lock_irq(&acm->read_lock);
|
|
spin_lock(&acm->write_lock);
|
|
cnt = acm->susp_count++;
|
|
spin_unlock(&acm->write_lock);
|
|
spin_unlock_irq(&acm->read_lock);
|
|
|
|
if (cnt)
|
|
return 0;
|
|
/*
|
|
we treat opened interfaces differently,
|
|
we must guard against open
|
|
*/
|
|
mutex_lock(&acm->mutex);
|
|
|
|
if (acm->used)
|
|
stop_data_traffic(acm);
|
|
|
|
mutex_unlock(&acm->mutex);
|
|
return 0;
|
|
}
|
|
|
|
static int acm_resume(struct usb_interface *intf)
|
|
{
|
|
struct acm *acm = usb_get_intfdata(intf);
|
|
int rv = 0;
|
|
int cnt;
|
|
|
|
spin_lock_irq(&acm->read_lock);
|
|
acm->susp_count -= 1;
|
|
cnt = acm->susp_count;
|
|
spin_unlock_irq(&acm->read_lock);
|
|
|
|
if (cnt)
|
|
return 0;
|
|
|
|
mutex_lock(&acm->mutex);
|
|
if (acm->used) {
|
|
rv = usb_submit_urb(acm->ctrlurb, GFP_NOIO);
|
|
if (rv < 0)
|
|
goto err_out;
|
|
|
|
tasklet_schedule(&acm->urb_task);
|
|
}
|
|
|
|
err_out:
|
|
mutex_unlock(&acm->mutex);
|
|
return rv;
|
|
}
|
|
|
|
#endif /* CONFIG_PM */
|
|
/*
|
|
* USB driver structure.
|
|
*/
|
|
|
|
static struct usb_device_id acm_ids[] = {
|
|
/* quirky and broken devices */
|
|
{ USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
|
|
.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
|
|
},
|
|
{ USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
|
|
.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
|
|
},
|
|
{ USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
|
|
.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
|
|
},
|
|
{ USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
|
|
.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
|
|
},
|
|
{ USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
|
|
.driver_info = SINGLE_RX_URB, /* firmware bug */
|
|
},
|
|
{ USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
|
|
.driver_info = SINGLE_RX_URB, /* firmware bug */
|
|
},
|
|
{ USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
|
|
.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
|
|
},
|
|
{ USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
|
|
.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
|
|
},
|
|
|
|
/* control interfaces with various AT-command sets */
|
|
{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
|
|
USB_CDC_ACM_PROTO_AT_V25TER) },
|
|
{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
|
|
USB_CDC_ACM_PROTO_AT_PCCA101) },
|
|
{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
|
|
USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
|
|
{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
|
|
USB_CDC_ACM_PROTO_AT_GSM) },
|
|
{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
|
|
USB_CDC_ACM_PROTO_AT_3G ) },
|
|
{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
|
|
USB_CDC_ACM_PROTO_AT_CDMA) },
|
|
|
|
/* NOTE: COMM/ACM/0xff is likely MSFT RNDIS ... NOT a modem!! */
|
|
{ }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE (usb, acm_ids);
|
|
|
|
static struct usb_driver acm_driver = {
|
|
.name = "cdc_acm",
|
|
.probe = acm_probe,
|
|
.disconnect = acm_disconnect,
|
|
#ifdef CONFIG_PM
|
|
.suspend = acm_suspend,
|
|
.resume = acm_resume,
|
|
#endif
|
|
.id_table = acm_ids,
|
|
#ifdef CONFIG_PM
|
|
.supports_autosuspend = 1,
|
|
#endif
|
|
};
|
|
|
|
/*
|
|
* TTY driver structures.
|
|
*/
|
|
|
|
static const struct tty_operations acm_ops = {
|
|
.open = acm_tty_open,
|
|
.close = acm_tty_close,
|
|
.write = acm_tty_write,
|
|
.write_room = acm_tty_write_room,
|
|
.ioctl = acm_tty_ioctl,
|
|
.throttle = acm_tty_throttle,
|
|
.unthrottle = acm_tty_unthrottle,
|
|
.chars_in_buffer = acm_tty_chars_in_buffer,
|
|
.break_ctl = acm_tty_break_ctl,
|
|
.set_termios = acm_tty_set_termios,
|
|
.tiocmget = acm_tty_tiocmget,
|
|
.tiocmset = acm_tty_tiocmset,
|
|
};
|
|
|
|
/*
|
|
* Init / exit.
|
|
*/
|
|
|
|
static int __init acm_init(void)
|
|
{
|
|
int retval;
|
|
acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
|
|
if (!acm_tty_driver)
|
|
return -ENOMEM;
|
|
acm_tty_driver->owner = THIS_MODULE,
|
|
acm_tty_driver->driver_name = "acm",
|
|
acm_tty_driver->name = "ttyACM",
|
|
acm_tty_driver->major = ACM_TTY_MAJOR,
|
|
acm_tty_driver->minor_start = 0,
|
|
acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
|
|
acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
|
|
acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
|
|
acm_tty_driver->init_termios = tty_std_termios;
|
|
acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
|
|
tty_set_operations(acm_tty_driver, &acm_ops);
|
|
|
|
retval = tty_register_driver(acm_tty_driver);
|
|
if (retval) {
|
|
put_tty_driver(acm_tty_driver);
|
|
return retval;
|
|
}
|
|
|
|
retval = usb_register(&acm_driver);
|
|
if (retval) {
|
|
tty_unregister_driver(acm_tty_driver);
|
|
put_tty_driver(acm_tty_driver);
|
|
return retval;
|
|
}
|
|
|
|
info(DRIVER_VERSION ":" DRIVER_DESC);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit acm_exit(void)
|
|
{
|
|
usb_deregister(&acm_driver);
|
|
tty_unregister_driver(acm_tty_driver);
|
|
put_tty_driver(acm_tty_driver);
|
|
}
|
|
|
|
module_init(acm_init);
|
|
module_exit(acm_exit);
|
|
|
|
MODULE_AUTHOR( DRIVER_AUTHOR );
|
|
MODULE_DESCRIPTION( DRIVER_DESC );
|
|
MODULE_LICENSE("GPL");
|
|
|