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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.c150
1 files changed, 129 insertions, 21 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index e8404319ca68..904efb6035b0 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -262,6 +262,7 @@ static void acm_ctrl_irq(struct urb *urb)
struct usb_cdc_notification *dr = urb->transfer_buffer;
unsigned char *data;
int newctrl;
+ int difference;
int retval;
int status = urb->status;
@@ -302,20 +303,31 @@ static void acm_ctrl_irq(struct urb *urb)
tty_port_tty_hangup(&acm->port, false);
}
+ difference = acm->ctrlin ^ newctrl;
+ spin_lock(&acm->read_lock);
acm->ctrlin = newctrl;
+ acm->oldcount = acm->iocount;
+
+ if (difference & ACM_CTRL_DSR)
+ acm->iocount.dsr++;
+ if (difference & ACM_CTRL_BRK)
+ acm->iocount.brk++;
+ if (difference & ACM_CTRL_RI)
+ acm->iocount.rng++;
+ if (difference & ACM_CTRL_DCD)
+ acm->iocount.dcd++;
+ if (difference & ACM_CTRL_FRAMING)
+ acm->iocount.frame++;
+ if (difference & ACM_CTRL_PARITY)
+ acm->iocount.parity++;
+ if (difference & ACM_CTRL_OVERRUN)
+ acm->iocount.overrun++;
+ spin_unlock(&acm->read_lock);
+
+ if (difference)
+ wake_up_all(&acm->wioctl);
- dev_dbg(&acm->control->dev,
- "%s - input control lines: dcd%c dsr%c break%c "
- "ring%c framing%c parity%c overrun%c\n",
- __func__,
- 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;
+ break;
default:
dev_dbg(&acm->control->dev,
@@ -506,13 +518,16 @@ static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
dev_err(&acm->control->dev,
"%s - usb_submit_urb(ctrl irq) failed\n", __func__);
+ usb_autopm_put_interface(acm->control);
goto error_submit_urb;
}
acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
if (acm_set_control(acm, acm->ctrlout) < 0 &&
- (acm->ctrl_caps & USB_CDC_CAP_LINE))
+ (acm->ctrl_caps & USB_CDC_CAP_LINE)) {
+ usb_autopm_put_interface(acm->control);
goto error_set_control;
+ }
usb_autopm_put_interface(acm->control);
@@ -537,7 +552,6 @@ error_submit_read_urbs:
error_set_control:
usb_kill_urb(acm->ctrlurb);
error_submit_urb:
- usb_autopm_put_interface(acm->control);
error_get_interface:
disconnected:
mutex_unlock(&acm->mutex);
@@ -796,6 +810,72 @@ static int set_serial_info(struct acm *acm,
return retval;
}
+static int wait_serial_change(struct acm *acm, unsigned long arg)
+{
+ int rv = 0;
+ DECLARE_WAITQUEUE(wait, current);
+ struct async_icount old, new;
+
+ if (arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD ))
+ return -EINVAL;
+ do {
+ spin_lock_irq(&acm->read_lock);
+ old = acm->oldcount;
+ new = acm->iocount;
+ acm->oldcount = new;
+ spin_unlock_irq(&acm->read_lock);
+
+ if ((arg & TIOCM_DSR) &&
+ old.dsr != new.dsr)
+ break;
+ if ((arg & TIOCM_CD) &&
+ old.dcd != new.dcd)
+ break;
+ if ((arg & TIOCM_RI) &&
+ old.rng != new.rng)
+ break;
+
+ add_wait_queue(&acm->wioctl, &wait);
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule();
+ remove_wait_queue(&acm->wioctl, &wait);
+ if (acm->disconnected) {
+ if (arg & TIOCM_CD)
+ break;
+ else
+ rv = -ENODEV;
+ } else {
+ if (signal_pending(current))
+ rv = -ERESTARTSYS;
+ }
+ } while (!rv);
+
+
+
+ return rv;
+}
+
+static int get_serial_usage(struct acm *acm,
+ struct serial_icounter_struct __user *count)
+{
+ struct serial_icounter_struct icount;
+ int rv = 0;
+
+ memset(&icount, 0, sizeof(icount));
+ icount.dsr = acm->iocount.dsr;
+ icount.rng = acm->iocount.rng;
+ icount.dcd = acm->iocount.dcd;
+ icount.frame = acm->iocount.frame;
+ icount.overrun = acm->iocount.overrun;
+ icount.parity = acm->iocount.parity;
+ icount.brk = acm->iocount.brk;
+
+ if (copy_to_user(count, &icount, sizeof(icount)) > 0)
+ rv = -EFAULT;
+
+ return rv;
+}
+
static int acm_tty_ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg)
{
@@ -809,6 +889,18 @@ static int acm_tty_ioctl(struct tty_struct *tty,
case TIOCSSERIAL:
rv = set_serial_info(acm, (struct serial_struct __user *) arg);
break;
+ case TIOCMIWAIT:
+ rv = usb_autopm_get_interface(acm->control);
+ if (rv < 0) {
+ rv = -EIO;
+ break;
+ }
+ rv = wait_serial_change(acm, arg);
+ usb_autopm_put_interface(acm->control);
+ break;
+ case TIOCGICOUNT:
+ rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
+ break;
}
return rv;
@@ -1167,6 +1259,7 @@ made_compressed_probe:
acm->readsize = readsize;
acm->rx_buflimit = num_rx_buf;
INIT_WORK(&acm->work, acm_softint);
+ init_waitqueue_head(&acm->wioctl);
spin_lock_init(&acm->write_lock);
spin_lock_init(&acm->read_lock);
mutex_init(&acm->mutex);
@@ -1383,6 +1476,7 @@ static void acm_disconnect(struct usb_interface *intf)
device_remove_file(&acm->control->dev,
&dev_attr_iCountryCodeRelDate);
}
+ wake_up_all(&acm->wioctl);
device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
usb_set_intfdata(acm->control, NULL);
usb_set_intfdata(acm->data, NULL);
@@ -1560,13 +1654,27 @@ static const struct usb_device_id acm_ids[] = {
},
/* Motorola H24 HSPA module: */
{ USB_DEVICE(0x22b8, 0x2d91) }, /* modem */
- { USB_DEVICE(0x22b8, 0x2d92) }, /* modem + diagnostics */
- { USB_DEVICE(0x22b8, 0x2d93) }, /* modem + AT port */
- { USB_DEVICE(0x22b8, 0x2d95) }, /* modem + AT port + diagnostics */
- { USB_DEVICE(0x22b8, 0x2d96) }, /* modem + NMEA */
- { USB_DEVICE(0x22b8, 0x2d97) }, /* modem + diagnostics + NMEA */
- { USB_DEVICE(0x22b8, 0x2d99) }, /* modem + AT port + NMEA */
- { USB_DEVICE(0x22b8, 0x2d9a) }, /* modem + AT port + diagnostics + NMEA */
+ { USB_DEVICE(0x22b8, 0x2d92), /* modem + diagnostics */
+ .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
+ },
+ { USB_DEVICE(0x22b8, 0x2d93), /* modem + AT port */
+ .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
+ },
+ { USB_DEVICE(0x22b8, 0x2d95), /* modem + AT port + diagnostics */
+ .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
+ },
+ { USB_DEVICE(0x22b8, 0x2d96), /* modem + NMEA */
+ .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
+ },
+ { USB_DEVICE(0x22b8, 0x2d97), /* modem + diagnostics + NMEA */
+ .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
+ },
+ { USB_DEVICE(0x22b8, 0x2d99), /* modem + AT port + NMEA */
+ .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
+ },
+ { USB_DEVICE(0x22b8, 0x2d9a), /* modem + AT port + diagnostics + NMEA */
+ .driver_info = NO_UNION_NORMAL, /* handle only modem interface */
+ },
{ USB_DEVICE(0x0572, 0x1329), /* Hummingbird huc56s (Conexant) */
.driver_info = NO_UNION_NORMAL, /* union descriptor misplaced on
generated by cgit v1.2.3 (git 2.25.1) at 2025-12-27 16:05:01 +0000