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usb: cdc-acm: add PPS support

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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>
This commit is contained in:
Dan Drown 2023-08-05 21:26:13 -05:00 committed by Greg Kroah-Hartman
parent d9216d3ef5
commit 3b563b901e
1 changed files with 11 additions and 1 deletions
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12
drivers/usb/class/cdc-acm.c
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@ -28,6 +28,7 @@
#include <linux/serial.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/tty_ldisc.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>
@ -324,8 +325,17 @@ static void acm_process_notification(struct acm *acm, unsigned char *buf)
if (difference & USB_CDC_SERIAL_STATE_DSR)
acm->iocount.dsr++;
if (difference & USB_CDC_SERIAL_STATE_DCD)
if (difference & USB_CDC_SERIAL_STATE_DCD) {
if (acm->port.tty) {
struct tty_ldisc *ld = tty_ldisc_ref(acm->port.tty);
if (ld) {
if (ld->ops->dcd_change)
ld->ops->dcd_change(acm->port.tty, newctrl & USB_CDC_SERIAL_STATE_DCD);
tty_ldisc_deref(ld);
}
}
acm->iocount.dcd++;
}
if (newctrl & USB_CDC_SERIAL_STATE_BREAK) {
acm->iocount.brk++;
tty_insert_flip_char(&acm->port, 0, TTY_BREAK);