From 3b563b901eefb47ce27a9897dea2739abe70ee5a Mon Sep 17 00:00:00 2001 From: Dan Drown Date: Sat, 5 Aug 2023 21:26:13 -0500 Subject: 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 Link: https://lore.kernel.org/r/ZM8ExV6bAvJtIA1d@vps3.drown.org Signed-off-by: Greg Kroah-Hartman --- drivers/usb/class/cdc-acm.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) (limited to 'drivers/usb/class') diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index 11da5fb284d0..9b34199474c4 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -28,6 +28,7 @@ #include #include #include +#include #include #include #include @@ -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); -- cgit v1.2.3