/* * cdc-acm.c * * Copyright (c) 1999 Armin Fuerst * Copyright (c) 1999 Pavel Machek * Copyright (c) 1999 Johannes Erdfelt * Copyright (c) 2000 Vojtech Pavlik * Copyright (c) 2004 Oliver Neukum * * 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 * v0.24 - change probe method to evaluate CDC union descriptor */ /* * 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 #include #include #include "cdc-acm.h" /* * 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" static struct usb_driver acm_driver; static struct tty_driver *acm_tty_driver; static struct acm *acm_table[ACM_TTY_MINORS]; static DECLARE_MUTEX(open_sem); #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, 5000); 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, USB_CDC_REQ_SET_CONTROL_LINE_STATE, control, NULL, 0) #define acm_set_line(acm, line) \ acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line)) #define acm_send_break(acm, ms) \ acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0) /* * Write buffer management. * All of these assume proper locks taken by the caller. */ static int acm_wb_alloc(struct acm *acm) { int i, wbn; struct acm_wb *wb; wbn = acm->write_current; i = 0; for (;;) { wb = &acm->wb[wbn]; if (!wb->use) { wb->use = 1; return wbn; } wbn = (wbn + 1) % ACM_NWB; if (++i >= ACM_NWB) return -1; } } static void acm_wb_free(struct acm *acm, int wbn) { acm->wb[wbn].use = 0; } static int acm_wb_is_avail(struct acm *acm) { int i, n; n = 0; for (i = 0; i < ACM_NWB; i++) { if (!acm->wb[i].use) n++; } return n; } static inline int acm_wb_is_used(struct acm *acm, int wbn) { return acm->wb[wbn].use; } /* * Finish write. */ static void acm_write_done(struct acm *acm) { unsigned long flags; int wbn; spin_lock_irqsave(&acm->write_lock, flags); acm->write_ready = 1; wbn = acm->write_current; acm_wb_free(acm, wbn); acm->write_current = (wbn + 1) % ACM_NWB; spin_unlock_irqrestore(&acm->write_lock, flags); } /* * Poke write. */ static int acm_write_start(struct acm *acm) { unsigned long flags; int wbn; struct acm_wb *wb; int rc; spin_lock_irqsave(&acm->write_lock, flags); if (!acm->dev) { spin_unlock_irqrestore(&acm->write_lock, flags); return -ENODEV; } if (!acm->write_ready) { spin_unlock_irqrestore(&acm->write_lock, flags); return 0; /* A white lie */ } wbn = acm->write_current; if (!acm_wb_is_used(acm, wbn)) { spin_unlock_irqrestore(&acm->write_lock, flags); return 0; } wb = &acm->wb[wbn]; acm->write_ready = 0; spin_unlock_irqrestore(&acm->write_lock, flags); acm->writeurb->transfer_buffer = wb->buf; acm->writeurb->transfer_dma = wb->dmah; acm->writeurb->transfer_buffer_length = wb->len; acm->writeurb->dev = acm->dev; if ((rc = usb_submit_urb(acm->writeurb, GFP_ATOMIC)) < 0) { dbg("usb_submit_urb(write bulk) failed: %d", rc); acm_write_done(acm); } return rc; } /* * 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_cdc_notification *dr = urb->transfer_buffer; unsigned char *data; 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; data = (unsigned char *)(dr + 1); switch (dr->bNotificationType) { case USB_CDC_NOTIFY_NETWORK_CONNECTION: dbg("%s network", dr->wValue ? "connected to" : "disconnected from"); break; case USB_CDC_NOTIFY_SERIAL_STATE: newctrl = le16_to_cpu(get_unaligned((__le16 *) 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 notification %d received: index %d len %d data0 %d data1 %d", dr->bNotificationType, 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; dbg("Entering acm_read_bulk with status %d\n", urb->status); 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; dbg("Entering acm_rx_tasklet"); 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); } dbg("Handed %d bytes to tty layer", i+1); tty_flip_buffer_push(tty); } spin_lock(&acm->throttle_lock); if (acm->throttle) { dbg("Throtteling noticed"); memmove(data, data + i, urb->actual_length - i); urb->actual_length -= i; acm->resubmit_to_unthrottle = 1; spin_unlock(&acm->throttle_lock); return; } spin_unlock(&acm->throttle_lock); 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; dbg("Entering acm_write_bulk with status %d\n", urb->status); acm_write_done(acm); acm_write_start(acm); if (ACM_READY(acm)) schedule_work(&acm->work); } static void acm_softint(void *private) { struct acm *acm = private; dbg("Entering acm_softint.\n"); if (!ACM_READY(acm)) return; tty_wakeup(acm->tty); } /* * TTY handlers */ static int acm_tty_open(struct tty_struct *tty, struct file *filp) { struct acm *acm; int rv = -EINVAL; dbg("Entering acm_tty_open.\n"); down(&open_sem); acm = acm_table[tty->index]; if (!acm || !acm->dev) goto err_out; else rv = 0; tty->driver_data = acm; acm->tty = tty; if (acm->used++) { 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; } acm->readurb->dev = acm->dev; if (usb_submit_urb(acm->readurb, GFP_KERNEL)) { dbg("usb_submit_urb(read bulk) failed"); goto bail_out_and_unlink; } if (0 > acm_set_control(acm, acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS)) goto full_bailout; /* 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; done: err_out: up(&open_sem); return rv; full_bailout: usb_kill_urb(acm->readurb); bail_out_and_unlink: usb_kill_urb(acm->ctrlurb); bail_out: acm->used--; up(&open_sem); return -EIO; } static void acm_tty_unregister(struct acm *acm) { tty_unregister_device(acm_tty_driver, acm->minor); usb_put_intf(acm->control); acm_table[acm->minor] = NULL; usb_free_urb(acm->ctrlurb); usb_free_urb(acm->readurb); usb_free_urb(acm->writeurb); kfree(acm); } static void acm_tty_close(struct tty_struct *tty, struct file *filp) { struct acm *acm = tty->driver_data; if (!acm || !acm->used) return; down(&open_sem); if (!--acm->used) { if (acm->dev) { acm_set_control(acm, acm->ctrlout = 0); usb_kill_urb(acm->ctrlurb); usb_kill_urb(acm->writeurb); usb_kill_urb(acm->readurb); } else acm_tty_unregister(acm); } up(&open_sem); } 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,\n", 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); acm_write_start(acm); 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)) < 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_NWB - 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); if (acm->resubmit_to_unthrottle) { acm->resubmit_to_unthrottle = 0; 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 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 helper: write 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_NWB; i++, wb++) { usb_buffer_free(acm->dev, acm->writesize, wb->buf, wb->dmah); } } /* 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_NWB; 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; 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; /* handle quirks deadly to normal probing*/ quirks = (unsigned long)id->driver_info; 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("Wierd 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: /* maybe somehow export */ break; /* for now we ignore it */ 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: err("Ignoring extra header, type %d, length %d", 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,"Seperate 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; } } 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 ((epread->bEndpointAddress & USB_DIR_IN) != USB_DIR_IN) { /* 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 = kmalloc(sizeof(struct acm), GFP_KERNEL))) { dev_dbg(&intf->dev, "out of memory (acm kmalloc)\n"); goto alloc_fail; } memset(acm, 0, sizeof(struct acm)); ctrlsize = le16_to_cpu(epctrl->wMaxPacketSize); readsize = le16_to_cpu(epread->wMaxPacketSize); acm->writesize = le16_to_cpu(epwrite->wMaxPacketSize); 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->bh.func = acm_rx_tasklet; acm->bh.data = (unsigned long) acm; INIT_WORK(&acm->work, acm_softint, acm); spin_lock_init(&acm->throttle_lock); spin_lock_init(&acm->write_lock); acm->write_ready = 1; 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; buf = usb_buffer_alloc(usb_dev, readsize, GFP_KERNEL, &acm->read_dma); if (!buf) { dev_dbg(&intf->dev, "out of memory (read buffer alloc)\n"); goto alloc_fail3; } acm->read_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; } acm->readurb = usb_alloc_urb(0, GFP_KERNEL); if (!acm->readurb) { dev_dbg(&intf->dev, "out of memory (readurb kmalloc)\n"); goto alloc_fail6; } acm->writeurb = usb_alloc_urb(0, GFP_KERNEL); if (!acm->writeurb) { dev_dbg(&intf->dev, "out of memory (writeurb kmalloc)\n"); goto alloc_fail7; } 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; usb_fill_bulk_urb(acm->readurb, usb_dev, usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress), acm->read_buffer, readsize, acm_read_bulk, acm); acm->readurb->transfer_flags |= URB_NO_FSBR | URB_NO_TRANSFER_DMA_MAP; acm->readurb->transfer_dma = acm->read_dma; usb_fill_bulk_urb(acm->writeurb, usb_dev, usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress), NULL, acm->writesize, acm_write_bulk, acm); acm->writeurb->transfer_flags |= URB_NO_FSBR | URB_NO_TRANSFER_DMA_MAP; /* acm->writeurb->transfer_dma = 0; */ 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; usb_set_intfdata (intf, acm); return 0; alloc_fail7: usb_free_urb(acm->readurb); alloc_fail6: usb_free_urb(acm->ctrlurb); alloc_fail5: acm_write_buffers_free(acm); alloc_fail4: usb_buffer_free(usb_dev, readsize, acm->read_buffer, acm->read_dma); alloc_fail3: usb_buffer_free(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma); alloc_fail2: kfree(acm); alloc_fail: return -ENOMEM; } static void acm_disconnect(struct usb_interface *intf) { struct acm *acm = usb_get_intfdata (intf); struct usb_device *usb_dev = interface_to_usbdev(intf); if (!acm || !acm->dev) { dbg("disconnect on nonexisting interface"); return; } down(&open_sem); acm->dev = NULL; usb_set_intfdata (intf, NULL); usb_kill_urb(acm->ctrlurb); usb_kill_urb(acm->readurb); usb_kill_urb(acm->writeurb); flush_scheduled_work(); /* wait for acm_softint */ acm_write_buffers_free(acm); usb_buffer_free(usb_dev, acm->readsize, acm->read_buffer, acm->read_dma); usb_buffer_free(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma); usb_driver_release_interface(&acm_driver, acm->data); if (!acm->used) { acm_tty_unregister(acm); up(&open_sem); return; } up(&open_sem); if (acm->tty) tty_hangup(acm->tty); } /* * 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(0x0482, 0x0203), /* KYOCERA AH-K3001V */ .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 = { .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");