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path: root/drivers/usb/class/cdc-acm.c
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Diffstat (limited to 'drivers/usb/class/cdc-acm.c')
-rw-r--r--drivers/usb/class/cdc-acm.c942
1 files changed, 942 insertions, 0 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
new file mode 100644
index 00000000000..6d1f9b6aecf
--- /dev/null
+++ b/drivers/usb/class/cdc-acm.c
@@ -0,0 +1,942 @@
+/*
+ * 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>
+ *
+ * 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 <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/smp_lock.h>
+#include <asm/uaccess.h>
+#include <linux/usb.h>
+#include <linux/usb_cdc.h>
+#include <asm/byteorder.h>
+#include <asm/unaligned.h>
+
+#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)
+
+/*
+ * 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);
+
+ if (!ACM_READY(acm))
+ goto out;
+
+ if (urb->status)
+ dbg("nonzero write bulk status received: %d", urb->status);
+
+ schedule_work(&acm->work);
+out:
+ acm->ready_for_write = 1;
+}
+
+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_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 {
+ 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);
+ }
+ }
+ 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;
+ dbg("Entering acm_tty_write to write %d bytes,\n", count);
+
+ if (!ACM_READY(acm))
+ return -EINVAL;
+ if (!acm->ready_for_write)
+ return 0;
+ if (!count)
+ return 0;
+
+ count = (count > acm->writesize) ? acm->writesize : count;
+
+ dbg("Get %d bytes...", count);
+ memcpy(acm->write_buffer, buf, count);
+ dbg(" Successfully copied.\n");
+
+ acm->writeurb->transfer_buffer_length = count;
+ acm->writeurb->dev = acm->dev;
+
+ acm->ready_for_write = 0;
+ stat = usb_submit_urb(acm->writeurb, GFP_ATOMIC);
+ if (stat < 0) {
+ dbg("usb_submit_urb(write bulk) failed");
+ acm->ready_for_write = 1;
+ 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->ready_for_write ? 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->ready_for_write ? 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;
+ 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.
+ */
+
+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);
+ acm->ready_for_write = 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;
+
+ buf = usb_buffer_alloc(usb_dev, acm->writesize, GFP_KERNEL, &acm->write_dma);
+ if (!buf) {
+ dev_dbg(&intf->dev, "out of memory (write buffer alloc)\n");
+ goto alloc_fail4;
+ }
+ acm->write_buffer = buf;
+
+ 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),
+ acm->write_buffer, acm->writesize, acm_write_bulk, acm);
+ acm->writeurb->transfer_flags |= URB_NO_FSBR | URB_NO_TRANSFER_DMA_MAP;
+ acm->writeurb->transfer_dma = acm->write_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);
+
+ tty_register_device(acm_tty_driver, minor, &intf->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:
+ usb_buffer_free(usb_dev, acm->writesize, acm->write_buffer, acm->write_dma);
+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 */
+
+ usb_buffer_free(usb_dev, acm->writesize, acm->write_buffer, acm->write_dma);
+ 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) {
+ 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);
+ 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 */
+ },
+ /* 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");
+