/* * cdc-acm.c * * Copyright (c) 1999 Armin Fuerst * Copyright (c) 1999 Pavel Machek * Copyright (c) 1999 Johannes Erdfelt * Copyright (c) 2000 Vojtech Pavlik * * USB Abstract Control Model driver for USB modems and ISDN adapters * * Sponsored by SuSE * * ChangeLog: * v0.9 - thorough cleaning, URBification, almost a rewrite * v0.10 - some more cleanups * v0.11 - fixed flow control, read error doesn't stop reads * v0.12 - added TIOCM ioctls, added break handling, made struct acm kmalloced * v0.13 - added termios, added hangup * v0.14 - sized down struct acm * v0.15 - fixed flow control again - characters could be lost * v0.16 - added code for modems with swapped data and control interfaces * v0.17 - added new style probing * v0.18 - fixed new style probing for devices with more configurations * v0.19 - fixed CLOCAL handling (thanks to Richard Shih-Ping Chan) * v0.20 - switched to probing on interface (rather than device) class * v0.21 - revert to probing on device for devices with multiple configs * v0.22 - probe only the control interface. if usbcore doesn't choose the * config we want, sysadmin changes bConfigurationValue in sysfs. * v0.23 - use softirq for rx processing, as needed by tty layer */ /* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #undef DEBUG #include #include #include #include #include #include #include #include #include #include #include #include /* * Version Information */ #define DRIVER_VERSION "v0.23" #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik" #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters" /* * CMSPAR, some architectures can't have space and mark parity. */ #ifndef CMSPAR #define CMSPAR 0 #endif /* * Major and minor numbers. */ #define ACM_TTY_MAJOR 166 #define ACM_TTY_MINORS 32 /* * Requests. */ #define USB_RT_ACM (USB_TYPE_CLASS | USB_RECIP_INTERFACE) #define ACM_REQ_COMMAND 0x00 #define ACM_REQ_RESPONSE 0x01 #define ACM_REQ_SET_FEATURE 0x02 #define ACM_REQ_GET_FEATURE 0x03 #define ACM_REQ_CLEAR_FEATURE 0x04 #define ACM_REQ_SET_LINE 0x20 #define ACM_REQ_GET_LINE 0x21 #define ACM_REQ_SET_CONTROL 0x22 #define ACM_REQ_SEND_BREAK 0x23 /* * IRQs. */ #define ACM_IRQ_NETWORK 0x00 #define ACM_IRQ_LINE_STATE 0x20 /* * Output control lines. */ #define ACM_CTRL_DTR 0x01 #define ACM_CTRL_RTS 0x02 /* * Input control lines and line errors. */ #define ACM_CTRL_DCD 0x01 #define ACM_CTRL_DSR 0x02 #define ACM_CTRL_BRK 0x04 #define ACM_CTRL_RI 0x08 #define ACM_CTRL_FRAMING 0x10 #define ACM_CTRL_PARITY 0x20 #define ACM_CTRL_OVERRUN 0x40 /* * Line speed and caracter encoding. */ struct acm_line { __u32 speed; __u8 stopbits; __u8 parity; __u8 databits; } __attribute__ ((packed)); /* * Internal driver structures. */ struct acm { struct usb_device *dev; /* the corresponding usb device */ struct usb_interface *control; /* control interface */ struct usb_interface *data; /* data interface */ struct tty_struct *tty; /* the corresponding tty */ struct urb *ctrlurb, *readurb, *writeurb; /* urbs */ struct acm_line line; /* line coding (bits, stop, parity) */ struct work_struct work; /* work queue entry for line discipline waking up */ struct tasklet_struct bh; /* rx processing */ unsigned int ctrlin; /* input control lines (DCD, DSR, RI, break, overruns) */ unsigned int ctrlout; /* output control lines (DTR, RTS) */ unsigned int writesize; /* max packet size for the output bulk endpoint */ unsigned int used; /* someone has this acm's device open */ unsigned int minor; /* acm minor number */ unsigned char throttle; /* throttled by tty layer */ unsigned char clocal; /* termios CLOCAL */ }; static struct usb_driver acm_driver; static struct tty_driver *acm_tty_driver; static struct acm *acm_table[ACM_TTY_MINORS]; #define ACM_READY(acm) (acm && acm->dev && acm->used) /* * Functions for ACM control messages. */ static int acm_ctrl_msg(struct acm *acm, int request, int value, void *buf, int len) { int retval = usb_control_msg(acm->dev, usb_sndctrlpipe(acm->dev, 0), request, USB_RT_ACM, value, acm->control->altsetting[0].desc.bInterfaceNumber, buf, len, HZ * 5); dbg("acm_control_msg: rq: 0x%02x val: %#x len: %#x result: %d", request, value, len, retval); return retval < 0 ? retval : 0; } /* devices aren't required to support these requests. * the cdc acm descriptor tells whether they do... */ #define acm_set_control(acm, control) acm_ctrl_msg(acm, ACM_REQ_SET_CONTROL, control, NULL, 0) #define acm_set_line(acm, line) acm_ctrl_msg(acm, ACM_REQ_SET_LINE, 0, line, sizeof(struct acm_line)) #define acm_send_break(acm, ms) acm_ctrl_msg(acm, ACM_REQ_SEND_BREAK, ms, NULL, 0) /* * Interrupt handlers for various ACM device responses */ /* control interface reports status changes with "interrupt" transfers */ static void acm_ctrl_irq(struct urb *urb, struct pt_regs *regs) { struct acm *acm = urb->context; struct usb_ctrlrequest *dr = urb->transfer_buffer; unsigned char *data = (unsigned char *)(dr + 1); int newctrl; int status; switch (urb->status) { case 0: /* success */ break; case -ECONNRESET: case -ENOENT: case -ESHUTDOWN: /* this urb is terminated, clean up */ dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status); return; default: dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status); goto exit; } if (!ACM_READY(acm)) goto exit; switch (dr->bRequest) { case ACM_IRQ_NETWORK: dbg("%s network", dr->wValue ? "connected to" : "disconnected from"); break; case ACM_IRQ_LINE_STATE: newctrl = le16_to_cpup((__u16 *) data); if (acm->tty && !acm->clocal && (acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) { dbg("calling hangup"); tty_hangup(acm->tty); } acm->ctrlin = newctrl; dbg("input control lines: dcd%c dsr%c break%c ring%c framing%c parity%c overrun%c", acm->ctrlin & ACM_CTRL_DCD ? '+' : '-', acm->ctrlin & ACM_CTRL_DSR ? '+' : '-', acm->ctrlin & ACM_CTRL_BRK ? '+' : '-', acm->ctrlin & ACM_CTRL_RI ? '+' : '-', acm->ctrlin & ACM_CTRL_FRAMING ? '+' : '-', acm->ctrlin & ACM_CTRL_PARITY ? '+' : '-', acm->ctrlin & ACM_CTRL_OVERRUN ? '+' : '-'); break; default: dbg("unknown control event received: request %d index %d len %d data0 %d data1 %d", dr->bRequest, dr->wIndex, dr->wLength, data[0], data[1]); break; } exit: status = usb_submit_urb (urb, GFP_ATOMIC); if (status) err ("%s - usb_submit_urb failed with result %d", __FUNCTION__, status); } /* data interface returns incoming bytes, or we got unthrottled */ static void acm_read_bulk(struct urb *urb, struct pt_regs *regs) { struct acm *acm = urb->context; if (!ACM_READY(acm)) return; if (urb->status) dev_dbg(&acm->data->dev, "bulk rx status %d\n", urb->status); /* calling tty_flip_buffer_push() in_irq() isn't allowed */ tasklet_schedule(&acm->bh); } static void acm_rx_tasklet(unsigned long _acm) { struct acm *acm = (void *)_acm; struct urb *urb = acm->readurb; struct tty_struct *tty = acm->tty; unsigned char *data = urb->transfer_buffer; int i = 0; if (urb->actual_length > 0 && !acm->throttle) { for (i = 0; i < urb->actual_length && !acm->throttle; i++) { /* if we insert more than TTY_FLIPBUF_SIZE characters, * we drop them. */ if (tty->flip.count >= TTY_FLIPBUF_SIZE) { tty_flip_buffer_push(tty); } tty_insert_flip_char(tty, data[i], 0); } tty_flip_buffer_push(tty); } if (acm->throttle) { memmove(data, data + i, urb->actual_length - i); urb->actual_length -= i; return; } urb->actual_length = 0; urb->dev = acm->dev; i = usb_submit_urb(urb, GFP_ATOMIC); if (i) dev_dbg(&acm->data->dev, "bulk rx resubmit %d\n", i); } /* data interface wrote those outgoing bytes */ static void acm_write_bulk(struct urb *urb, struct pt_regs *regs) { struct acm *acm = (struct acm *)urb->context; if (!ACM_READY(acm)) return; if (urb->status) dbg("nonzero write bulk status received: %d", urb->status); schedule_work(&acm->work); } static void acm_softint(void *private) { struct acm *acm = private; struct tty_struct *tty = acm->tty; if (!ACM_READY(acm)) return; if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup) (tty->ldisc.write_wakeup)(tty); wake_up_interruptible(&tty->write_wait); } /* * TTY handlers */ static int acm_tty_open(struct tty_struct *tty, struct file *filp) { struct acm *acm = acm_table[tty->index]; if (!acm || !acm->dev) return -EINVAL; tty->driver_data = acm; acm->tty = tty; lock_kernel(); if (acm->used++) { unlock_kernel(); return 0; } unlock_kernel(); acm->ctrlurb->dev = acm->dev; if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) dbg("usb_submit_urb(ctrl irq) failed"); acm->readurb->dev = acm->dev; if (usb_submit_urb(acm->readurb, GFP_KERNEL)) dbg("usb_submit_urb(read bulk) failed"); acm_set_control(acm, acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS); /* 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; return 0; } static void acm_tty_close(struct tty_struct *tty, struct file *filp) { struct acm *acm = tty->driver_data; if (!acm || !acm->used) return; if (!--acm->used) { if (acm->dev) { acm_set_control(acm, acm->ctrlout = 0); usb_unlink_urb(acm->ctrlurb); usb_unlink_urb(acm->writeurb); usb_unlink_urb(acm->readurb); } else { tty_unregister_device(acm_tty_driver, acm->minor); acm_table[acm->minor] = NULL; usb_free_urb(acm->ctrlurb); usb_free_urb(acm->readurb); usb_free_urb(acm->writeurb); kfree(acm); } } } static int acm_tty_write(struct tty_struct *tty, int from_user, const unsigned char *buf, int count) { struct acm *acm = tty->driver_data; int stat; if (!ACM_READY(acm)) return -EINVAL; if (acm->writeurb->status == -EINPROGRESS) return 0; if (!count) return 0; count = (count > acm->writesize) ? acm->writesize : count; if (from_user) { if (copy_from_user(acm->writeurb->transfer_buffer, (void __user *)buf, count)) return -EFAULT; } else memcpy(acm->writeurb->transfer_buffer, buf, count); acm->writeurb->transfer_buffer_length = count; acm->writeurb->dev = acm->dev; /* GFP_KERNEL probably works if from_user */ stat = usb_submit_urb(acm->writeurb, GFP_ATOMIC); if (stat < 0) { dbg("usb_submit_urb(write bulk) failed"); 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; return acm->writeurb->status == -EINPROGRESS ? 0 : acm->writesize; } static int acm_tty_chars_in_buffer(struct tty_struct *tty) { struct acm *acm = tty->driver_data; if (!ACM_READY(acm)) return -EINVAL; return acm->writeurb->status == -EINPROGRESS ? acm->writeurb->transfer_buffer_length : 0; } static void acm_tty_throttle(struct tty_struct *tty) { struct acm *acm = tty->driver_data; if (!ACM_READY(acm)) return; acm->throttle = 1; } static void acm_tty_unthrottle(struct tty_struct *tty) { struct acm *acm = tty->driver_data; if (!ACM_READY(acm)) return; acm->throttle = 0; if (acm->readurb->status != -EINPROGRESS) acm_read_bulk(acm->readurb, NULL); } static void acm_tty_break_ctl(struct tty_struct *tty, int state) { struct acm *acm = tty->driver_data; if (!ACM_READY(acm)) return; if (acm_send_break(acm, state ? 0xffff : 0)) dbg("send break failed"); } 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 __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 __u8 acm_tty_size[] = { 5, 6, 7, 8 }; static void acm_tty_set_termios(struct tty_struct *tty, struct termios *termios_old) { struct acm *acm = tty->driver_data; struct termios *termios = tty->termios; struct acm_line newline; int newctrl = acm->ctrlout; if (!ACM_READY(acm)) return; newline.speed = cpu_to_le32p(acm_tty_speed + (termios->c_cflag & CBAUD & ~CBAUDEX) + (termios->c_cflag & CBAUDEX ? 15 : 0)); newline.stopbits = termios->c_cflag & CSTOPB ? 2 : 0; newline.parity = termios->c_cflag & PARENB ? (termios->c_cflag & PARODD ? 1 : 2) + (termios->c_cflag & CMSPAR ? 2 : 0) : 0; newline.databits = acm_tty_size[(termios->c_cflag & CSIZE) >> 4]; acm->clocal = ((termios->c_cflag & CLOCAL) != 0); if (!newline.speed) { newline.speed = acm->line.speed; 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(struct acm_line))) { memcpy(&acm->line, &newline, sizeof(struct acm_line)); dbg("set line: %d %d %d %d", newline.speed, newline.stopbits, newline.parity, newline.databits); acm_set_line(acm, &acm->line); } } /* * USB probe and disconnect routines. */ static int acm_probe (struct usb_interface *intf, const struct usb_device_id *id) { struct usb_device *dev; struct acm *acm; struct usb_host_config *cfacm; struct usb_interface *data = NULL; struct usb_host_interface *ifcom, *ifdata = NULL; struct usb_endpoint_descriptor *epctrl = NULL; struct usb_endpoint_descriptor *epread = NULL; struct usb_endpoint_descriptor *epwrite = NULL; int readsize, ctrlsize, minor, j; unsigned char *buf; dev = interface_to_usbdev (intf); cfacm = dev->actconfig; /* We know we're probe()d with the control interface. */ ifcom = intf->cur_altsetting; /* ACM doesn't guarantee the data interface is * adjacent to the control interface, or that if one * is there it's not for call management ... so find * it */ for (j = 0; j < cfacm->desc.bNumInterfaces; j++) { ifdata = cfacm->interface[j]->cur_altsetting; data = cfacm->interface[j]; if (ifdata->desc.bInterfaceClass == 10 && ifdata->desc.bNumEndpoints == 2) { epctrl = &ifcom->endpoint[0].desc; epread = &ifdata->endpoint[0].desc; epwrite = &ifdata->endpoint[1].desc; if ((epctrl->bEndpointAddress & 0x80) != 0x80 || (epctrl->bmAttributes & 3) != 3 || (epread->bmAttributes & 3) != 2 || (epwrite->bmAttributes & 3) != 2 || ((epread->bEndpointAddress & 0x80) ^ (epwrite->bEndpointAddress & 0x80)) != 0x80) goto next_interface; if ((epread->bEndpointAddress & 0x80) != 0x80) { epread = &ifdata->endpoint[1].desc; epwrite = &ifdata->endpoint[0].desc; } dbg("found data interface at %d\n", j); break; } else { next_interface: ifdata = NULL; data = NULL; } } /* there's been a problem */ if (!ifdata) { dbg("interface not found (%p)\n", ifdata); return -ENODEV; } for (minor = 0; minor < ACM_TTY_MINORS && acm_table[minor]; minor++); if (acm_table[minor]) { err("no more free acm devices"); return -ENODEV; } if (!(acm = kmalloc(sizeof(struct acm), GFP_KERNEL))) { err("out of memory"); return -ENOMEM; } memset(acm, 0, sizeof(struct acm)); ctrlsize = epctrl->wMaxPacketSize; readsize = epread->wMaxPacketSize; acm->writesize = epwrite->wMaxPacketSize; acm->control = intf; acm->data = data; acm->minor = minor; acm->dev = dev; acm->bh.func = acm_rx_tasklet; acm->bh.data = (unsigned long) acm; INIT_WORK(&acm->work, acm_softint, acm); if (!(buf = kmalloc(ctrlsize + readsize + acm->writesize, GFP_KERNEL))) { err("out of memory"); kfree(acm); return -ENOMEM; } acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL); if (!acm->ctrlurb) { err("out of memory"); kfree(acm); kfree(buf); return -ENOMEM; } acm->readurb = usb_alloc_urb(0, GFP_KERNEL); if (!acm->readurb) { err("out of memory"); usb_free_urb(acm->ctrlurb); kfree(acm); kfree(buf); return -ENOMEM; } acm->writeurb = usb_alloc_urb(0, GFP_KERNEL); if (!acm->writeurb) { err("out of memory"); usb_free_urb(acm->readurb); usb_free_urb(acm->ctrlurb); kfree(acm); kfree(buf); return -ENOMEM; } usb_fill_int_urb(acm->ctrlurb, dev, usb_rcvintpipe(dev, epctrl->bEndpointAddress), buf, ctrlsize, acm_ctrl_irq, acm, epctrl->bInterval); usb_fill_bulk_urb(acm->readurb, dev, usb_rcvbulkpipe(dev, epread->bEndpointAddress), buf += ctrlsize, readsize, acm_read_bulk, acm); acm->readurb->transfer_flags |= URB_NO_FSBR; usb_fill_bulk_urb(acm->writeurb, dev, usb_sndbulkpipe(dev, epwrite->bEndpointAddress), buf += readsize, acm->writesize, acm_write_bulk, acm); acm->writeurb->transfer_flags |= URB_NO_FSBR; dev_info(&intf->dev, "ttyACM%d: USB ACM device", minor); acm_set_control(acm, acm->ctrlout); acm->line.speed = cpu_to_le32(9600); acm->line.databits = 8; acm_set_line(acm, &acm->line); if ( (j = usb_driver_claim_interface(&acm_driver, data, acm)) != 0) { err("claim failed"); usb_free_urb(acm->ctrlurb); usb_free_urb(acm->readurb); usb_free_urb(acm->writeurb); kfree(acm); kfree(buf); return j; } tty_register_device(acm_tty_driver, minor, &intf->dev); acm_table[minor] = acm; usb_set_intfdata (intf, acm); return 0; } static void acm_disconnect(struct usb_interface *intf) { struct acm *acm = usb_get_intfdata (intf); if (!acm || !acm->dev) { dbg("disconnect on nonexisting interface"); return; } acm->dev = NULL; usb_set_intfdata (intf, NULL); usb_unlink_urb(acm->ctrlurb); usb_unlink_urb(acm->readurb); usb_unlink_urb(acm->writeurb); kfree(acm->ctrlurb->transfer_buffer); usb_driver_release_interface(&acm_driver, acm->data); if (!acm->used) { tty_unregister_device(acm_tty_driver, acm->minor); acm_table[acm->minor] = NULL; usb_free_urb(acm->ctrlurb); usb_free_urb(acm->readurb); usb_free_urb(acm->writeurb); kfree(acm); return; } if (acm->tty) tty_hangup(acm->tty); } /* * USB driver structure. */ static struct usb_device_id acm_ids[] = { /* control interfaces with various AT-command sets */ { USB_INTERFACE_INFO(USB_CLASS_COMM, 2, 1) }, { USB_INTERFACE_INFO(USB_CLASS_COMM, 2, 2) }, { USB_INTERFACE_INFO(USB_CLASS_COMM, 2, 3) }, { USB_INTERFACE_INFO(USB_CLASS_COMM, 2, 4) }, { USB_INTERFACE_INFO(USB_CLASS_COMM, 2, 5) }, { USB_INTERFACE_INFO(USB_CLASS_COMM, 2, 6) }, /* NOTE: COMM/2/0xff is likely MSFT RNDIS ... NOT a modem!! */ { } }; MODULE_DEVICE_TABLE (usb, acm_ids); static struct usb_driver acm_driver = { .owner = THIS_MODULE, .name = "cdc_acm", .probe = acm_probe, .disconnect = acm_disconnect, .id_table = acm_ids, }; /* * TTY driver structures. */ static 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->devfs_name = "usb/acm/", 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_NO_DEVFS, 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");