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android_kernel_xiaomi_sm8350/drivers/usb/class/cdc-acm.c
Alan Cox 9e98966c7b tty: rework break handling 
Some hardware needs to do break handling itself and may have partial
support only. Make break_ctl return an error code. Add a tty driver flag
so you can indicate driver hardware side break support.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-22 13:03:28 -07:00

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/*
* 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
#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"
/*
* 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)
/*
* 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;
n = ACM_NW;
for (i = 0; i < ACM_NW; i++) {
n -= acm->wb[i].use;
}
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, struct acm_wb *wb)
{
unsigned long flags;
spin_lock_irqsave(&acm->write_lock, flags);
acm->write_ready = 1;
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;
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 */
}
wb = &acm->wb[wbn];
if(acm_wb_is_avail(acm) <= 1)
acm->write_ready = 0;
dbg("%s susp_count: %d", __func__, acm->susp_count);
if (acm->susp_count) {
acm->old_ready = acm->write_ready;
acm->delayed_wb = wb;
acm->write_ready = 0;
schedule_work(&acm->waker);
spin_unlock_irqrestore(&acm->write_lock, flags);
return 0; /* A white lie */
}
usb_mark_last_busy(acm->dev);
if (!acm_wb_is_used(acm, wbn)) {
spin_unlock_irqrestore(&acm->write_lock, flags);
return 0;
}
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)
err ("%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 *acm;
struct acm_wb *wb = urb->context;
dbg("Entering acm_write_bulk with status %d", urb->status);
acm = wb->instance;
acm_write_done(acm, wb);
if (ACM_READY(acm))
schedule_work(&acm->work);
}
static void acm_softint(struct work_struct *work)
{
struct acm *acm = container_of(work, struct acm, work);
dbg("Entering acm_softint.");
if (!ACM_READY(acm))
return;
tty_wakeup(acm->tty);
}
static void acm_waker(struct work_struct *waker)
{
struct acm *acm = container_of(waker, struct acm, waker);
long flags;
int rv;
rv = usb_autopm_get_interface(acm->control);
if (rv < 0) {
err("Autopm failure in %s", __func__);
return;
}
if (acm->delayed_wb) {
acm_start_wb(acm, acm->delayed_wb);
acm->delayed_wb = NULL;
}
spin_lock_irqsave(&acm->write_lock, flags);
acm->write_ready = acm->old_ready;
spin_unlock_irqrestore(&acm->write_lock, flags);
usb_autopm_put_interface(acm->control);
}
/*
* TTY handlers
*/
static int acm_tty_open(struct tty_struct *tty, struct file *filp)
{
struct acm *acm;
int rv = -EINVAL;
int i;
dbg("Entering acm_tty_open.");
mutex_lock(&open_mutex);
acm = acm_table[tty->index];
if (!acm || !acm->dev)
goto err_out;
else
rv = 0;
set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
tty->driver_data = acm;
acm->tty = tty;
/* force low_latency on so that our tty_push actually forces the data through,
otherwise it is scheduled, and with high data rates data can get lost. */
tty->low_latency = 1;
if (usb_autopm_get_interface(acm->control) < 0)
goto early_bail;
else
acm->control->needs_remote_wakeup = 1;
mutex_lock(&acm->mutex);
if (acm->used++) {
usb_autopm_put_interface(acm->control);
goto done;
}
acm->ctrlurb->dev = acm->dev;
if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
dbg("usb_submit_urb(ctrl irq) failed");
goto bail_out;
}
if (0 > acm_set_control(acm, acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS) &&
(acm->ctrl_caps & USB_CDC_CAP_LINE))
goto full_bailout;
usb_autopm_put_interface(acm->control);
INIT_LIST_HEAD(&acm->spare_read_urbs);
INIT_LIST_HEAD(&acm->spare_read_bufs);
INIT_LIST_HEAD(&acm->filled_read_bufs);
for (i = 0; i < acm->rx_buflimit; i++) {
list_add(&(acm->ru[i].list), &acm->spare_read_urbs);
}
for (i = 0; i < acm->rx_buflimit; i++) {
list_add(&(acm->rb[i].list), &acm->spare_read_bufs);
}
acm->throttle = 0;
tasklet_schedule(&acm->urb_task);
done:
err_out:
mutex_unlock(&acm->mutex);
mutex_unlock(&open_mutex);
return rv;
full_bailout:
usb_kill_urb(acm->ctrlurb);
bail_out:
usb_autopm_put_interface(acm->control);
acm->used--;
mutex_unlock(&acm->mutex);
early_bail:
mutex_unlock(&open_mutex);
return -EIO;
}
static void acm_tty_unregister(struct acm *acm)
{
int i,nr;
nr = acm->rx_buflimit;
tty_unregister_device(acm_tty_driver, acm->minor);
usb_put_intf(acm->control);
acm_table[acm->minor] = NULL;
usb_free_urb(acm->ctrlurb);
for (i = 0; i < ACM_NW; i++)
usb_free_urb(acm->wb[i].urb);
for (i = 0; i < nr; i++)
usb_free_urb(acm->ru[i].urb);
kfree(acm->country_codes);
kfree(acm);
}
static void acm_tty_close(struct tty_struct *tty, struct file *filp)
{
struct acm *acm = tty->driver_data;
int i,nr;
if (!acm || !acm->used)
return;
nr = acm->rx_buflimit;
mutex_lock(&open_mutex);
if (!--acm->used) {
if (acm->dev) {
usb_autopm_get_interface(acm->control);
acm_set_control(acm, acm->ctrlout = 0);
usb_kill_urb(acm->ctrlurb);
for (i = 0; i < ACM_NW; i++)
usb_kill_urb(acm->wb[i].urb);
for (i = 0; i < nr; i++)
usb_kill_urb(acm->ru[i].urb);
acm->control->needs_remote_wakeup = 0;
usb_autopm_put_interface(acm->control);
} else
acm_tty_unregister(acm);
}
mutex_unlock(&open_mutex);
}
static int acm_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
struct acm *acm = tty->driver_data;
int stat;
unsigned long flags;
int wbn;
struct acm_wb *wb;
dbg("Entering acm_tty_write to write %d bytes,", count);
if (!ACM_READY(acm))
return -EINVAL;
if (!count)
return 0;
spin_lock_irqsave(&acm->write_lock, flags);
if ((wbn = acm_wb_alloc(acm)) < 0) {
spin_unlock_irqrestore(&acm->write_lock, flags);
return 0;
}
wb = &acm->wb[wbn];
count = (count > acm->writesize) ? acm->writesize : count;
dbg("Get %d bytes...", count);
memcpy(wb->buf, buf, count);
wb->len = count;
spin_unlock_irqrestore(&acm->write_lock, flags);
if ((stat = acm_write_start(acm, wbn)) < 0)
return stat;
return count;
}
static int acm_tty_write_room(struct tty_struct *tty)
{
struct acm *acm = tty->driver_data;
if (!ACM_READY(acm))
return -EINVAL;
/*
* Do not let the line discipline to know that we have a reserve,
* or it might get too enthusiastic.
*/
return (acm->write_ready && acm_wb_is_avail(acm)) ? acm->writesize : 0;
}
static int acm_tty_chars_in_buffer(struct tty_struct *tty)
{
struct acm *acm = tty->driver_data;
if (!ACM_READY(acm))
return -EINVAL;
/*
* This is inaccurate (overcounts), but it works.
*/
return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
}
static void acm_tty_throttle(struct tty_struct *tty)
{
struct acm *acm = tty->driver_data;
if (!ACM_READY(acm))
return;
spin_lock_bh(&acm->throttle_lock);
acm->throttle = 1;
spin_unlock_bh(&acm->throttle_lock);
}
static void acm_tty_unthrottle(struct tty_struct *tty)
{
struct acm *acm = tty->driver_data;
if (!ACM_READY(acm))
return;
spin_lock_bh(&acm->throttle_lock);
acm->throttle = 0;
spin_unlock_bh(&acm->throttle_lock);
tasklet_schedule(&acm->urb_task);
}
static int acm_tty_break_ctl(struct tty_struct *tty, int state)
{
struct acm *acm = tty->driver_data;
int retval;
if (!ACM_READY(acm))
return -EINVAL;
retval = acm_send_break(acm, state ? 0xffff : 0);
if (retval < 0)
dbg("send break failed");
return retval;
}
static int acm_tty_tiocmget(struct tty_struct *tty, struct file *file)
{
struct acm *acm = tty->driver_data;
if (!ACM_READY(acm))
return -EINVAL;
return (acm->ctrlout & ACM_CTRL_DTR ? TIOCM_DTR : 0) |
(acm->ctrlout & ACM_CTRL_RTS ? TIOCM_RTS : 0) |
(acm->ctrlin & ACM_CTRL_DSR ? TIOCM_DSR : 0) |
(acm->ctrlin & ACM_CTRL_RI ? TIOCM_RI : 0) |
(acm->ctrlin & ACM_CTRL_DCD ? TIOCM_CD : 0) |
TIOCM_CTS;
}
static int acm_tty_tiocmset(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear)
{
struct acm *acm = tty->driver_data;
unsigned int newctrl;
if (!ACM_READY(acm))
return -EINVAL;
newctrl = acm->ctrlout;
set = (set & TIOCM_DTR ? ACM_CTRL_DTR : 0) | (set & TIOCM_RTS ? ACM_CTRL_RTS : 0);
clear = (clear & TIOCM_DTR ? ACM_CTRL_DTR : 0) | (clear & TIOCM_RTS ? ACM_CTRL_RTS : 0);
newctrl = (newctrl & ~clear) | set;
if (acm->ctrlout == newctrl)
return 0;
return acm_set_control(acm, acm->ctrlout = newctrl);
}
static int acm_tty_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
{
struct acm *acm = tty->driver_data;
if (!ACM_READY(acm))
return -EINVAL;
return -ENOIOCTLCMD;
}
static const __u32 acm_tty_speed[] = {
0, 50, 75, 110, 134, 150, 200, 300, 600,
1200, 1800, 2400, 4800, 9600, 19200, 38400,
57600, 115200, 230400, 460800, 500000, 576000,
921600, 1000000, 1152000, 1500000, 2000000,
2500000, 3000000, 3500000, 4000000
};
static const __u8 acm_tty_size[] = {
5, 6, 7, 8
};
static void acm_tty_set_termios(struct tty_struct *tty, struct ktermios *termios_old)
{
struct acm *acm = tty->driver_data;
struct ktermios *termios = tty->termios;
struct usb_cdc_line_coding newline;
int newctrl = acm->ctrlout;
if (!ACM_READY(acm))
return;
newline.dwDTERate = cpu_to_le32p(acm_tty_speed +
(termios->c_cflag & CBAUD & ~CBAUDEX) + (termios->c_cflag & CBAUDEX ? 15 : 0));
newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
newline.bParityType = termios->c_cflag & PARENB ?
(termios->c_cflag & PARODD ? 1 : 2) + (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
newline.bDataBits = acm_tty_size[(termios->c_cflag & CSIZE) >> 4];
acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
if (!newline.dwDTERate) {
newline.dwDTERate = acm->line.dwDTERate;
newctrl &= ~ACM_CTRL_DTR;
} else newctrl |= ACM_CTRL_DTR;
if (newctrl != acm->ctrlout)
acm_set_control(acm, acm->ctrlout = newctrl);
if (memcmp(&acm->line, &newline, sizeof newline)) {
memcpy(&acm->line, &newline, sizeof newline);
dbg("set line: %d %d %d %d", le32_to_cpu(newline.dwDTERate),
newline.bCharFormat, newline.bParityType,
newline.bDataBits);
acm_set_line(acm, &acm->line);
}
}
/*
* USB probe and disconnect routines.
*/
/* Little helpers: write/read buffers free */
static void acm_write_buffers_free(struct acm *acm)
{
int i;
struct acm_wb *wb;
for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
usb_buffer_free(acm->dev, acm->writesize, wb->buf, wb->dmah);
}
}
static void acm_read_buffers_free(struct acm *acm)
{
struct usb_device *usb_dev = interface_to_usbdev(acm->control);
int i, n = acm->rx_buflimit;
for (i = 0; i < n; i++)
usb_buffer_free(usb_dev, acm->readsize, acm->rb[i].base, acm->rb[i].dma);
}
/* Little helper: write buffers allocate */
static int acm_write_buffers_alloc(struct acm *acm)
{
int i;
struct acm_wb *wb;
for (wb = &acm->wb[0], i = 0; i < ACM_NW; i++, wb++) {
wb->buf = usb_buffer_alloc(acm->dev, acm->writesize, GFP_KERNEL,
&wb->dmah);
if (!wb->buf) {
while (i != 0) {
--i;
--wb;
usb_buffer_free(acm->dev, acm->writesize,
wb->buf, wb->dmah);
}
return -ENOMEM;
}
}
return 0;
}
static int acm_probe (struct usb_interface *intf,
const struct usb_device_id *id)
{
struct usb_cdc_union_desc *union_header = NULL;
struct usb_cdc_country_functional_desc *cfd = NULL;
unsigned char *buffer = intf->altsetting->extra;
int buflen = intf->altsetting->extralen;
struct usb_interface *control_interface;
struct usb_interface *data_interface;
struct usb_endpoint_descriptor *epctrl;
struct usb_endpoint_descriptor *epread;
struct usb_endpoint_descriptor *epwrite;
struct usb_device *usb_dev = interface_to_usbdev(intf);
struct acm *acm;
int minor;
int ctrlsize,readsize;
u8 *buf;
u8 ac_management_function = 0;
u8 call_management_function = 0;
int call_interface_num = -1;
int data_interface_num;
unsigned long quirks;
int num_rx_buf;
int i;
/* normal quirks */
quirks = (unsigned long)id->driver_info;
num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
/* handle quirks deadly to normal probing*/
if (quirks == NO_UNION_NORMAL) {
data_interface = usb_ifnum_to_if(usb_dev, 1);
control_interface = usb_ifnum_to_if(usb_dev, 0);
goto skip_normal_probe;
}
/* normal probing*/
if (!buffer) {
err("Weird descriptor references\n");
return -EINVAL;
}
if (!buflen) {
if (intf->cur_altsetting->endpoint->extralen && intf->cur_altsetting->endpoint->extra) {
dev_dbg(&intf->dev,"Seeking extra descriptors on endpoint\n");
buflen = intf->cur_altsetting->endpoint->extralen;
buffer = intf->cur_altsetting->endpoint->extra;
} else {
err("Zero length descriptor references\n");
return -EINVAL;
}
}
while (buflen > 0) {
if (buffer [1] != USB_DT_CS_INTERFACE) {
err("skipping garbage\n");
goto next_desc;
}
switch (buffer [2]) {
case USB_CDC_UNION_TYPE: /* we've found it */
if (union_header) {
err("More than one union descriptor, skipping ...");
goto next_desc;
}
union_header = (struct usb_cdc_union_desc *)
buffer;
break;
case USB_CDC_COUNTRY_TYPE: /* export through sysfs*/
cfd = (struct usb_cdc_country_functional_desc *)buffer;
break;
case USB_CDC_HEADER_TYPE: /* maybe check version */
break; /* for now we ignore it */
case USB_CDC_ACM_TYPE:
ac_management_function = buffer[3];
break;
case USB_CDC_CALL_MANAGEMENT_TYPE:
call_management_function = buffer[3];
call_interface_num = buffer[4];
if ((call_management_function & 3) != 3)
err("This device cannot do calls on its own. It is no modem.");
break;
default:
/* there are LOTS more CDC descriptors that
* could legitimately be found here.
*/
dev_dbg(&intf->dev, "Ignoring descriptor: "
"type %02x, length %d\n",
buffer[2], buffer[0]);
break;
}
next_desc:
buflen -= buffer[0];
buffer += buffer[0];
}
if (!union_header) {
if (call_interface_num > 0) {
dev_dbg(&intf->dev,"No union descriptor, using call management descriptor\n");
data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = call_interface_num));
control_interface = intf;
} else {
dev_dbg(&intf->dev,"No union descriptor, giving up\n");
return -ENODEV;
}
} else {
control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
data_interface = usb_ifnum_to_if(usb_dev, (data_interface_num = union_header->bSlaveInterface0));
if (!control_interface || !data_interface) {
dev_dbg(&intf->dev,"no interfaces\n");
return -ENODEV;
}
}
if (data_interface_num != call_interface_num)
dev_dbg(&intf->dev,"Separate call control interface. That is not fully supported.\n");
skip_normal_probe:
/*workaround for switched interfaces */
if (data_interface->cur_altsetting->desc.bInterfaceClass != CDC_DATA_INTERFACE_TYPE) {
if (control_interface->cur_altsetting->desc.bInterfaceClass == CDC_DATA_INTERFACE_TYPE) {
struct usb_interface *t;
dev_dbg(&intf->dev,"Your device has switched interfaces.\n");
t = control_interface;
control_interface = data_interface;
data_interface = t;
} else {
return -EINVAL;
}
}
/* Accept probe requests only for the control interface */
if (intf != control_interface)
return -ENODEV;
if (usb_interface_claimed(data_interface)) { /* valid in this context */
dev_dbg(&intf->dev,"The data interface isn't available\n");
return -EBUSY;
}
if (data_interface->cur_altsetting->desc.bNumEndpoints < 2)
return -EINVAL;
epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
epread = &data_interface->cur_altsetting->endpoint[0].desc;
epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
/* workaround for switched endpoints */
if (!usb_endpoint_dir_in(epread)) {
/* descriptors are swapped */
struct usb_endpoint_descriptor *t;
dev_dbg(&intf->dev,"The data interface has switched endpoints\n");
t = epread;
epread = epwrite;
epwrite = t;
}
dbg("interfaces are valid");
for (minor = 0; minor < ACM_TTY_MINORS && acm_table[minor]; minor++);
if (minor == ACM_TTY_MINORS) {
err("no more free acm devices");
return -ENODEV;
}
if (!(acm = kzalloc(sizeof(struct acm), GFP_KERNEL))) {
dev_dbg(&intf->dev, "out of memory (acm kzalloc)\n");
goto alloc_fail;
}
ctrlsize = le16_to_cpu(epctrl->wMaxPacketSize);
readsize = le16_to_cpu(epread->wMaxPacketSize)* ( quirks == SINGLE_RX_URB ? 1 : 2);
acm->writesize = le16_to_cpu(epwrite->wMaxPacketSize) * 20;
acm->control = control_interface;
acm->data = data_interface;
acm->minor = minor;
acm->dev = usb_dev;
acm->ctrl_caps = ac_management_function;
acm->ctrlsize = ctrlsize;
acm->readsize = readsize;
acm->rx_buflimit = num_rx_buf;
acm->urb_task.func = acm_rx_tasklet;
acm->urb_task.data = (unsigned long) acm;
INIT_WORK(&acm->work, acm_softint);
INIT_WORK(&acm->waker, acm_waker);
spin_lock_init(&acm->throttle_lock);
spin_lock_init(&acm->write_lock);
spin_lock_init(&acm->read_lock);
mutex_init(&acm->mutex);
acm->write_ready = 1;
acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
buf = usb_buffer_alloc(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
if (!buf) {
dev_dbg(&intf->dev, "out of memory (ctrl buffer alloc)\n");
goto alloc_fail2;
}
acm->ctrl_buffer = buf;
if (acm_write_buffers_alloc(acm) < 0) {
dev_dbg(&intf->dev, "out of memory (write buffer alloc)\n");
goto alloc_fail4;
}
acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
if (!acm->ctrlurb) {
dev_dbg(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
goto alloc_fail5;
}
for (i = 0; i < num_rx_buf; i++) {
struct acm_ru *rcv = &(acm->ru[i]);
if (!(rcv->urb = usb_alloc_urb(0, GFP_KERNEL))) {
dev_dbg(&intf->dev, "out of memory (read urbs usb_alloc_urb)\n");
goto alloc_fail7;
}
rcv->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
rcv->instance = acm;
}
for (i = 0; i < num_rx_buf; i++) {
struct acm_rb *buf = &(acm->rb[i]);
if (!(buf->base = usb_buffer_alloc(acm->dev, readsize, GFP_KERNEL, &buf->dma))) {
dev_dbg(&intf->dev, "out of memory (read bufs usb_buffer_alloc)\n");
goto alloc_fail7;
}
}
for(i = 0; i < ACM_NW; i++)
{
struct acm_wb *snd = &(acm->wb[i]);
if (!(snd->urb = usb_alloc_urb(0, GFP_KERNEL))) {
dev_dbg(&intf->dev, "out of memory (write urbs usb_alloc_urb)");
goto alloc_fail7;
}
usb_fill_bulk_urb(snd->urb, usb_dev, usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
NULL, acm->writesize, acm_write_bulk, snd);
snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
snd->instance = acm;
}
usb_set_intfdata (intf, acm);
i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
if (i < 0)
goto alloc_fail8;
if (cfd) { /* export the country data */
acm->country_codes = kmalloc(cfd->bLength - 4, GFP_KERNEL);
if (!acm->country_codes)
goto skip_countries;
acm->country_code_size = cfd->bLength - 4;
memcpy(acm->country_codes, (u8 *)&cfd->wCountyCode0, cfd->bLength - 4);
acm->country_rel_date = cfd->iCountryCodeRelDate;
i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
if (i < 0) {
kfree(acm->country_codes);
goto skip_countries;
}
i = device_create_file(&intf->dev, &dev_attr_iCountryCodeRelDate);
if (i < 0) {
kfree(acm->country_codes);
goto skip_countries;
}
}
skip_countries:
usb_fill_int_urb(acm->ctrlurb, usb_dev, usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
acm->ctrl_buffer, ctrlsize, acm_ctrl_irq, acm, epctrl->bInterval);
acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
acm->ctrlurb->transfer_dma = acm->ctrl_dma;
dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
acm_set_control(acm, acm->ctrlout);
acm->line.dwDTERate = cpu_to_le32(9600);
acm->line.bDataBits = 8;
acm_set_line(acm, &acm->line);
usb_driver_claim_interface(&acm_driver, data_interface, acm);
usb_get_intf(control_interface);
tty_register_device(acm_tty_driver, minor, &control_interface->dev);
acm_table[minor] = acm;
return 0;
alloc_fail8:
for (i = 0; i < ACM_NW; i++)
usb_free_urb(acm->wb[i].urb);
alloc_fail7:
acm_read_buffers_free(acm);
for (i = 0; i < num_rx_buf; i++)
usb_free_urb(acm->ru[i].urb);
usb_free_urb(acm->ctrlurb);
alloc_fail5:
acm_write_buffers_free(acm);
alloc_fail4:
usb_buffer_free(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
alloc_fail2:
kfree(acm);
alloc_fail:
return -ENOMEM;
}
static void stop_data_traffic(struct acm *acm)
{
int i;
dbg("Entering stop_data_traffic");
tasklet_disable(&acm->urb_task);
usb_kill_urb(acm->ctrlurb);
for(i = 0; i < ACM_NW; i++)
usb_kill_urb(acm->wb[i].urb);
for (i = 0; i < acm->rx_buflimit; i++)
usb_kill_urb(acm->ru[i].urb);
tasklet_enable(&acm->urb_task);
cancel_work_sync(&acm->work);
cancel_work_sync(&acm->waker);
}
static void acm_disconnect(struct usb_interface *intf)
{
struct acm *acm = usb_get_intfdata(intf);
struct usb_device *usb_dev = interface_to_usbdev(intf);
mutex_lock(&open_mutex);
if (!acm || !acm->dev) {
mutex_unlock(&open_mutex);
return;
}
if (acm->country_codes){
device_remove_file(&acm->control->dev,
&dev_attr_wCountryCodes);
device_remove_file(&acm->control->dev,
&dev_attr_iCountryCodeRelDate);
}
device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
acm->dev = NULL;
usb_set_intfdata(acm->control, NULL);
usb_set_intfdata(acm->data, NULL);
stop_data_traffic(acm);
acm_write_buffers_free(acm);
usb_buffer_free(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
acm_read_buffers_free(acm);
usb_driver_release_interface(&acm_driver, intf == acm->control ?
acm->data : acm->control);
if (!acm->used) {
acm_tty_unregister(acm);
mutex_unlock(&open_mutex);
return;
}
mutex_unlock(&open_mutex);
if (acm->tty)
tty_hangup(acm->tty);
}
#ifdef CONFIG_PM
static int acm_suspend(struct usb_interface *intf, pm_message_t message)
{
struct acm *acm = usb_get_intfdata(intf);
int cnt;
if (acm->dev->auto_pm) {
int b;
spin_lock_irq(&acm->read_lock);
spin_lock(&acm->write_lock);
b = acm->processing + acm->transmitting;
spin_unlock(&acm->write_lock);
spin_unlock_irq(&acm->read_lock);
if (b)
return -EBUSY;
}
spin_lock_irq(&acm->read_lock);
spin_lock(&acm->write_lock);
cnt = acm->susp_count++;
spin_unlock(&acm->write_lock);
spin_unlock_irq(&acm->read_lock);
if (cnt)
return 0;
/*
we treat opened interfaces differently,
we must guard against open
*/
mutex_lock(&acm->mutex);
if (acm->used)
stop_data_traffic(acm);
mutex_unlock(&acm->mutex);
return 0;
}
static int acm_resume(struct usb_interface *intf)
{
struct acm *acm = usb_get_intfdata(intf);
int rv = 0;
int cnt;
spin_lock_irq(&acm->read_lock);
acm->susp_count -= 1;
cnt = acm->susp_count;
spin_unlock_irq(&acm->read_lock);
if (cnt)
return 0;
mutex_lock(&acm->mutex);
if (acm->used) {
rv = usb_submit_urb(acm->ctrlurb, GFP_NOIO);
if (rv < 0)
goto err_out;
tasklet_schedule(&acm->urb_task);
}
err_out:
mutex_unlock(&acm->mutex);
return rv;
}
#endif /* CONFIG_PM */
/*
* USB driver structure.
*/
static struct usb_device_id acm_ids[] = {
/* quirky and broken devices */
{ USB_DEVICE(0x0870, 0x0001), /* Metricom GS Modem */
.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
},
{ USB_DEVICE(0x0e8d, 0x0003), /* FIREFLY, MediaTek Inc; andrey.arapov@gmail.com */
.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
},
{ USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
},
{ USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
},
{ USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
.driver_info = SINGLE_RX_URB, /* firmware bug */
},
{ USB_DEVICE(0x0ace, 0x1611), /* ZyDAS 56K USB MODEM - new version */
.driver_info = SINGLE_RX_URB, /* firmware bug */
},
{ USB_DEVICE(0x22b8, 0x7000), /* Motorola Q Phone */
.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
},
{ USB_DEVICE(0x0803, 0x3095), /* Zoom Telephonics Model 3095F USB MODEM */
.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
},
/* control interfaces with various AT-command sets */
{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
USB_CDC_ACM_PROTO_AT_V25TER) },
{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
USB_CDC_ACM_PROTO_AT_PCCA101) },
{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
USB_CDC_ACM_PROTO_AT_PCCA101_WAKE) },
{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
USB_CDC_ACM_PROTO_AT_GSM) },
{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
USB_CDC_ACM_PROTO_AT_3G ) },
{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
USB_CDC_ACM_PROTO_AT_CDMA) },
/* NOTE: COMM/ACM/0xff is likely MSFT RNDIS ... NOT a modem!! */
{ }
};
MODULE_DEVICE_TABLE (usb, acm_ids);
static struct usb_driver acm_driver = {
.name = "cdc_acm",
.probe = acm_probe,
.disconnect = acm_disconnect,
#ifdef CONFIG_PM
.suspend = acm_suspend,
.resume = acm_resume,
#endif
.id_table = acm_ids,
#ifdef CONFIG_PM
.supports_autosuspend = 1,
#endif
};
/*
* TTY driver structures.
*/
static const struct tty_operations acm_ops = {
.open = acm_tty_open,
.close = acm_tty_close,
.write = acm_tty_write,
.write_room = acm_tty_write_room,
.ioctl = acm_tty_ioctl,
.throttle = acm_tty_throttle,
.unthrottle = acm_tty_unthrottle,
.chars_in_buffer = acm_tty_chars_in_buffer,
.break_ctl = acm_tty_break_ctl,
.set_termios = acm_tty_set_termios,
.tiocmget = acm_tty_tiocmget,
.tiocmset = acm_tty_tiocmset,
};
/*
* Init / exit.
*/
static int __init acm_init(void)
{
int retval;
acm_tty_driver = alloc_tty_driver(ACM_TTY_MINORS);
if (!acm_tty_driver)
return -ENOMEM;
acm_tty_driver->owner = THIS_MODULE,
acm_tty_driver->driver_name = "acm",
acm_tty_driver->name = "ttyACM",
acm_tty_driver->major = ACM_TTY_MAJOR,
acm_tty_driver->minor_start = 0,
acm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
acm_tty_driver->subtype = SERIAL_TYPE_NORMAL,
acm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
acm_tty_driver->init_termios = tty_std_termios;
acm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
tty_set_operations(acm_tty_driver, &acm_ops);
retval = tty_register_driver(acm_tty_driver);
if (retval) {
put_tty_driver(acm_tty_driver);
return retval;
}
retval = usb_register(&acm_driver);
if (retval) {
tty_unregister_driver(acm_tty_driver);
put_tty_driver(acm_tty_driver);
return retval;
}
info(DRIVER_VERSION ":" DRIVER_DESC);
return 0;
}
static void __exit acm_exit(void)
{
usb_deregister(&acm_driver);
tty_unregister_driver(acm_tty_driver);
put_tty_driver(acm_tty_driver);
}
module_init(acm_init);
module_exit(acm_exit);
MODULE_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
MODULE_LICENSE("GPL");
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