Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
usb: cdc-acm: add PPS support
This patch adds support for PPS to CDC devices. Changes to the DCD pin
are monitored and passed to the ldisc system, which is used by
pps-ldisc.
Signed-off-by: Dan Drown <dan-netdev@drown.org>
Link: https://lore.kernel.org/r/ZM8ExV6bAvJtIA1d@vps3.drown.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
authored by
Dan Drown
and committed by
Greg Kroah-Hartman
3b563b90
d9216d3e
+11
-1
+11
-1
drivers/usb/class/cdc-acm.c
+11
-1
drivers/usb/class/cdc-acm.c
···
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#include <linux/serial.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_flip.h>
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#include <linux/tty_ldisc.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/uaccess.h>
···
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if (difference & USB_CDC_SERIAL_STATE_DSR)
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acm->iocount.dsr++;
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if (difference & USB_CDC_SERIAL_STATE_DCD)
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if (difference & USB_CDC_SERIAL_STATE_DCD) {
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if (acm->port.tty) {
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struct tty_ldisc *ld = tty_ldisc_ref(acm->port.tty);
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if (ld) {
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if (ld->ops->dcd_change)
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ld->ops->dcd_change(acm->port.tty, newctrl & USB_CDC_SERIAL_STATE_DCD);
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tty_ldisc_deref(ld);
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}
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}
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acm->iocount.dcd++;
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}
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if (newctrl & USB_CDC_SERIAL_STATE_BREAK) {
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acm->iocount.brk++;
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tty_insert_flip_char(&acm->port, 0, TTY_BREAK);