/* * cdc-acm.c * * Copyright (c) 1999 Armin Fuerst <fuerst@in.tum.de> * Copyright (c) 1999 Pavel Machek <pavel@suse.cz> * Copyright (c) 1999 Johannes Erdfelt <johannes@erdfelt.com> * Copyright (c) 2000 Vojtech Pavlik <vojtech@suse.cz> * Copyright (c) 2004 Oliver Neukum <oliver@neukum.name> * Copyright (c) 2005 David Kubicek <dave@awk.cz> * * 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 * v0.25 - downstream tasks paralelized to maximize throughput * v0.26 - multiple write urbs, writesize increased */ /* * 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 #undef VERBOSE_DEBUG #include <linux/kernel.h> #include <linux/errno.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/tty.h> #include <linux/tty_driver.h> #include <linux/tty_flip.h> #include <linux/module.h> #include <linux/mutex.h> #include <asm/uaccess.h> #include <linux/usb.h> #include <linux/usb/cdc.h> #include <asm/byteorder.h> #include <asm/unaligned.h> #include <linux/list.h> #include "cdc-acm.h" #define ACM_CLOSE_TIMEOUT 15 /* seconds to let writes drain */ /* * Version Information */ #define DRIVER_VERSION "v0.26" #define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek" #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 DEFINE_MUTEX(open_mutex); #define ACM_READY(acm) (acm && acm->dev && acm->used) #ifdef VERBOSE_DEBUG #define verbose 1 #else #define verbose 0 #endif /* * 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 = 0; i = 0; for (;;) { wb = &acm->wb[wbn]; if (!wb->use) { wb->use = 1; return wbn; } wbn = (wbn + 1) % ACM_NW; if (++i >= ACM_NW) return -1; } } static int acm_wb_is_avail(struct acm *acm) { int i, n; unsigned long flags; n = ACM_NW; spin_lock_irqsave(&acm->write_lock, flags); for (i = 0; i < ACM_NW; i++) { n -= acm->wb[i].use; } spin_unlock_irqrestore(&acm->write_lock, flags); return n; } /* * Finish write. */ static void acm_write_done(struct acm *acm, struct acm_wb *wb) { unsigned long flags; spin_lock_irqsave(&acm->write_lock, flags); wb->use = 0; acm->transmitting--; spin_unlock_irqrestore(&acm->write_lock, flags); } /* * Poke write. * * the caller is responsible for locking */ static int acm_start_wb(struct acm *acm, struct acm_wb *wb) { int rc; acm->transmitting++; wb->urb->transfer_buffer = wb->buf; wb->urb->transfer_dma = wb->dmah; wb->urb->transfer_buffer_length = wb->len; wb->urb->dev = acm->dev; if ((rc = usb_submit_urb(wb->urb, GFP_ATOMIC)) < 0) { dbg("usb_submit_urb(write bulk) failed: %d", rc); acm_write_done(acm, wb); } return rc; } static int acm_write_start(struct acm *acm, int wbn) { unsigned long flags; struct acm_wb *wb = &acm->wb[wbn]; int rc; spin_lock_irqsave(&acm->write_lock, flags); if (!acm->dev) { wb->use = 0; spin_unlock_irqrestore(&acm->write_lock, flags); return -ENODEV; } dbg("%s susp_count: %d", __func__, acm->susp_count); if (acm->susp_count) { acm->delayed_wb = wb; schedule_work(&acm->waker); spin_unlock_irqrestore(&acm->write_lock, flags); return 0; /* A white lie */ } usb_mark_last_busy(acm->dev); rc = acm_start_wb(acm, wb); spin_unlock_irqrestore(&acm->write_lock, flags); return rc; } /* * attributes exported through sysfs */ static ssize_t show_caps (struct device *dev, struct device_attribute *attr, char *buf) { struct usb_interface *intf = to_usb_interface(dev); struct acm *acm = usb_get_intfdata(intf); return sprintf(buf, "%d", acm->ctrl_caps); } static DEVICE_ATTR(bmCapabilities, S_IRUGO, show_caps, NULL); static ssize_t show_country_codes (struct device *dev, struct device_attribute *attr, char *buf) { struct usb_interface *intf = to_usb_interface(dev); struct acm *acm = usb_get_intfdata(intf); memcpy(buf, acm->country_codes, acm->country_code_size); return acm->country_code_size; } static DEVICE_ATTR(wCountryCodes, S_IRUGO, show_country_codes, NULL); static ssize_t show_country_rel_date (struct device *dev, struct device_attribute *attr, char *buf) { struct usb_interface *intf = to_usb_interface(dev); struct acm *acm = usb_get_intfdata(intf); return sprintf(buf, "%d", acm->country_rel_date); } static DEVICE_ATTR(iCountryCodeRelDate, S_IRUGO, show_country_rel_date, NULL); /* * Interrupt handlers for various ACM device responses */ /* control interface reports status changes with "interrupt" transfers */ static void acm_ctrl_irq(struct urb *urb) { struct acm *acm = urb->context; struct usb_cdc_notification *dr = urb->transfer_buffer; unsigned char *data; int newctrl; int retval; int status = urb->status; switch (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", __func__, status); return; default: dbg("%s - nonzero urb status received: %d", __func__, 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 = 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: usb_mark_last_busy(acm->dev); retval = usb_submit_urb (urb, GFP_ATOMIC); if (retval) dev_err(&urb->dev->dev, "%s - usb_submit_urb failed with " "result %d", __func__, retval); } /* data interface returns incoming bytes, or we got unthrottled */ static void acm_read_bulk(struct urb *urb) { struct acm_rb *buf; struct acm_ru *rcv = urb->context; struct acm *acm = rcv->instance; int status = urb->status; dbg("Entering acm_read_bulk with status %d", status); if (!ACM_READY(acm)) { dev_dbg(&acm->data->dev, "Aborting, acm not ready"); return; } usb_mark_last_busy(acm->dev); if (status) dev_dbg(&acm->data->dev, "bulk rx status %d\n", status); buf = rcv->buffer; buf->size = urb->actual_length; if (likely(status == 0)) { spin_lock(&acm->read_lock); acm->processing++; list_add_tail(&rcv->list, &acm->spare_read_urbs); list_add_tail(&buf->list, &acm->filled_read_bufs); spin_unlock(&acm->read_lock); } else { /* we drop the buffer due to an error */ spin_lock(&acm->read_lock); list_add_tail(&rcv->list, &acm->spare_read_urbs); list_add(&buf->list, &acm->spare_read_bufs); spin_unlock(&acm->read_lock); /* nevertheless the tasklet must be kicked unconditionally so the queue cannot dry up */ } if (likely(!acm->susp_count)) tasklet_schedule(&acm->urb_task); } static void acm_rx_tasklet(unsigned long _acm) { struct acm *acm = (void *)_acm; struct acm_rb *buf; struct tty_struct *tty = acm->tty; struct acm_ru *rcv; unsigned long flags; unsigned char throttled; dbg("Entering acm_rx_tasklet"); if (!ACM_READY(acm)) { dbg("acm_rx_tasklet: ACM not ready"); return; } spin_lock_irqsave(&acm->throttle_lock, flags); throttled = acm->throttle; spin_unlock_irqrestore(&acm->throttle_lock, flags); if (throttled) { dbg("acm_rx_tasklet: throttled"); return; } next_buffer: spin_lock_irqsave(&acm->read_lock, flags); if (list_empty(&acm->filled_read_bufs)) { spin_unlock_irqrestore(&acm->read_lock, flags); goto urbs; } buf = list_entry(acm->filled_read_bufs.next, struct acm_rb, list); list_del(&buf->list); spin_unlock_irqrestore(&acm->read_lock, flags); dbg("acm_rx_tasklet: procesing buf 0x%p, size = %d", buf, buf->size); tty_buffer_request_room(tty, buf->size); spin_lock_irqsave(&acm->throttle_lock, flags); throttled = acm->throttle; spin_unlock_irqrestore(&acm->throttle_lock, flags); if (!throttled) tty_insert_flip_string(tty, buf->base, buf->size); tty_flip_buffer_push(tty); if (throttled) { dbg("Throttling noticed"); spin_lock_irqsave(&acm->read_lock, flags); list_add(&buf->list, &acm->filled_read_bufs); spin_unlock_irqrestore(&acm->read_lock, flags); return; } spin_lock_irqsave(&acm->read_lock, flags); list_add(&buf->list, &acm->spare_read_bufs); spin_unlock_irqrestore(&acm->read_lock, flags); goto next_buffer; urbs: while (!list_empty(&acm->spare_read_bufs)) { spin_lock_irqsave(&acm->read_lock, flags); if (list_empty(&acm->spare_read_urbs)) { acm->processing = 0; spin_unlock_irqrestore(&acm->read_lock, flags); return; } rcv = list_entry(acm->spare_read_urbs.next, struct acm_ru, list); list_del(&rcv->list); spin_unlock_irqrestore(&acm->read_lock, flags); buf = list_entry(acm->spare_read_bufs.next, struct acm_rb, list); list_del(&buf->list); rcv->buffer = buf; usb_fill_bulk_urb(rcv->urb, acm->dev, acm->rx_endpoint, buf->base, acm->readsize, acm_read_bulk, rcv); rcv->urb->transfer_dma = buf->dma; rcv->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; /* This shouldn't kill the driver as unsuccessful URBs are returned to the free-urbs-pool and resubmited ASAP */ spin_lock_irqsave(&acm->read_lock, flags); if (acm->susp_count || usb_submit_urb(rcv->urb, GFP_ATOMIC) < 0) { list_add(&buf->list, &acm->spare_read_bufs); list_add(&rcv->list, &acm->spare_read_urbs); acm->processing = 0; spin_unlock_irqrestore(&acm->read_lock, flags); return; } else { spin_unlock_irqrestore(&acm->read_lock, flags); dbg("acm_rx_tasklet: sending urb 0x%p, rcv 0x%p, buf 0x%p", rcv->urb, rcv, buf); } } spin_lock_irqsave(&acm->read_lock, flags); acm->processing = 0; spin_unlock_irqrestore(&acm->read_lock, flags); } /* data interface wrote those outgoing bytes */ static void acm_write_bulk(struct urb *urb) { struct acm_wb *wb = urb->context; struct acm *acm = wb->instance; if (verbose || urb->status || (urb->actual_length != urb->transfer_buffer_length)) dev_dbg(&acm->data->dev, "tx %d/%d bytes -- > %d\n", urb->actual_length, urb->transfer_buffer_length, urb->status); acm_write_done(acm, wb); if (ACM_READY(acm)) schedule_work(&acm->work); else wake_up_interruptible(&acm->drain_wait); } static void acm_softint(struct work_struct *work) { struct acm *acm = container_of(work, struct acm, work); dev_vdbg(&acm->data->dev, "tx work\n"); 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); int rv; rv = usb_autopm_get_interface(acm->control); if (rv < 0) { dev_err(&acm->dev->dev, "Autopm failure in %s\n", __func__); return; } if (acm->delayed_wb) { acm_start_wb(acm, acm->delayed_wb); acm->delayed_wb = NULL; } 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: mutex_unlock(&acm->mutex); err_out: 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 int acm_tty_chars_in_buffer(struct tty_struct *tty); 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); /* try letting the last writes drain naturally */ wait_event_interruptible_timeout(acm->drain_wait, (ACM_NW == acm_wb_is_avail(acm)) || !acm->dev, ACM_CLOSE_TIMEOUT * HZ); 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_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) { dev_err(&intf->dev, "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 { dev_err(&intf->dev, "Zero length descriptor references\n"); return -EINVAL; } } while (buflen > 0) { if (buffer [1] != USB_DT_CS_INTERFACE) { dev_err(&intf->dev, "skipping garbage\n"); goto next_desc; } switch (buffer [2]) { case USB_CDC_UNION_TYPE: /* we've found it */ if (union_header) { dev_err(&intf->dev, "More than one " "union descriptor, " "skipping ...\n"); 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) dev_err(&intf->dev, "This device " "cannot do calls on its own. " "It is no modem.\n"); 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) { dev_err(&intf->dev, "no more free acm devices\n"); 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); init_waitqueue_head(&acm->drain_wait); spin_lock_init(&acm->throttle_lock); spin_lock_init(&acm->write_lock); spin_lock_init(&acm->read_lock); mutex_init(&acm->mutex); 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 *rb = &(acm->rb[i]); rb->base = usb_buffer_alloc(acm->dev, readsize, GFP_KERNEL, &rb->dma); if (!rb->base) { 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_set_intfdata(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); /* sibling interface is already cleaning up */ if (!acm) return; mutex_lock(&open_mutex); 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 */ }, { USB_DEVICE(0x0572, 0x1321), /* Conexant USB MODEM CX93010 */ .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; } printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":" DRIVER_DESC "\n"); 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");