UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

serial:serial_core: Allow use of CTS for PPS line discipline 

Add a "pps_4wire" file to serial ports in sysfs in case the kernel is
configured with CONFIG_PPS_CLIENT_LDISC. Writing 1 to the file enables
the use of CTS instead of DCD for PPS signal input. This is necessary
in case a serial port is not completely wired.
Though this affects PPS processing the patch is against the serial core
as the source of the serial port PPS event dispatching has to be
modified. Furthermore it should be possible to modify the source of
serial port PPS event dispatching before changing the line discipline.

Signed-off-by: Andreas Steinmetz <ast@domdv.de>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Tested-by: Steve Sakoman <steve@sakoman.com>
Tested-by: Eric Gallimore <egallimore@ucsd.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Steve Sakoman 2018-09-20 09:20:34 -10:00 committed by Greg Kroah-Hartman
parent 669c5d8d5f
commit c550f01c81
3 changed files with 80 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
Documentation/ABI/testing/sysfs-tty
View File

@ -154,3 +154,12 @@ Description:
device specification. For example, when user sets 7bytes on
16550A, which has 1/4/8/14 bytes trigger, the RX trigger is
automatically changed to 4 bytes.
What: /sys/class/tty/ttyS0/pps_4wire
Date: September 2018
Contact: Steve Sakoman <steve@sakoman.com>
Description:
Shows/sets "4 wire" mode for the PPS input to the serial driver.
For fully implemented serial ports PPS is normally provided
on the DCD line. For partial "4 wire" implementations CTS is
used instead of DCD.

70
drivers/tty/serial/serial_core.c
View File

@ -2664,6 +2664,57 @@ static ssize_t uart_get_attr_iomem_reg_shift(struct device *dev,
return snprintf(buf, PAGE_SIZE, "%d\n", tmp.iomem_reg_shift);
}
static ssize_t pps_4wire_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct tty_port *port = dev_get_drvdata(dev);
struct uart_state *state = container_of(port, struct uart_state, port);
struct uart_port *uport;
int mode = 0;
mutex_lock(&port->mutex);
uport = uart_port_check(state);
if (!uport)
goto out;
mode = uport->pps_4wire;
out:
mutex_unlock(&port->mutex);
return sprintf(buf, mode ? "yes\n" : "no\n");
}
static ssize_t pps_4wire_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct tty_port *port = dev_get_drvdata(dev);
struct uart_state *state = container_of(port, struct uart_state, port);
struct uart_port *uport;
bool mode;
int ret;
if (!count)
return -EINVAL;
ret = kstrtobool(buf, &mode);
if (ret < 0)
return ret;
mutex_lock(&port->mutex);
uport = uart_port_check(state);
if (!uport)
goto out;
spin_lock_irq(&uport->lock);
uport->pps_4wire = mode;
spin_unlock_irq(&uport->lock);
out:
mutex_unlock(&port->mutex);
return count;
}
static DEVICE_ATTR_RW(pps_4wire);
static DEVICE_ATTR(type, S_IRUSR | S_IRGRP, uart_get_attr_type, NULL);
static DEVICE_ATTR(line, S_IRUSR | S_IRGRP, uart_get_attr_line, NULL);
static DEVICE_ATTR(port, S_IRUSR | S_IRGRP, uart_get_attr_port, NULL);
@ -2692,6 +2743,7 @@ static struct attribute *tty_dev_attrs[] = {
&dev_attr_io_type.attr,
&dev_attr_iomem_base.attr,
&dev_attr_iomem_reg_shift.attr,
&dev_attr_pps_4wire.attr,
NULL,
};
@ -2748,6 +2800,9 @@ int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport)
goto out;
}
/* assert that pps handling is done via DCD as default */
uport->pps_4wire = 0;
/*
* If this port is a console, then the spinlock is already
* initialised.
@ -2923,7 +2978,7 @@ void uart_handle_dcd_change(struct uart_port *uport, unsigned int status)
lockdep_assert_held_once(&uport->lock);
if (tty) {
if (tty && !uport->pps_4wire) {
ld = tty_ldisc_ref(tty);
if (ld) {
if (ld->ops->dcd_change)
@ -2952,8 +3007,21 @@ EXPORT_SYMBOL_GPL(uart_handle_dcd_change);
*/
void uart_handle_cts_change(struct uart_port *uport, unsigned int status)
{
struct tty_port *port = &uport->state->port;
struct tty_struct *tty = port->tty;
struct tty_ldisc *ld;
lockdep_assert_held_once(&uport->lock);
if (tty && uport->pps_4wire) {
ld = tty_ldisc_ref(tty);
if (ld) {
if (ld->ops->dcd_change)
ld->ops->dcd_change(tty, status);
tty_ldisc_deref(ld);
}
}
uport->icount.cts++;
if (uart_softcts_mode(uport)) {

3
include/linux/serial_core.h
View File

@ -255,7 +255,8 @@ struct uart_port {
struct device *dev; /* parent device */
unsigned char hub6; /* this should be in the 8250 driver */
unsigned char suspended;
unsigned char unused[2];
unsigned char pps_4wire; /* CTS instead of DCD */
unsigned char unused;
const char *name; /* port name */
struct attribute_group *attr_group; /* port specific attributes */
const struct attribute_group **tty_groups; /* all attributes (serial core use only) */