--- /dev/null
+diff --git a/Documentation/pps/Makefile b/Documentation/pps/Makefile
+new file mode 100644
+index 0000000..a2660a2
+--- /dev/null
++++ b/Documentation/pps/Makefile
+@@ -0,0 +1,27 @@
++TARGETS = ppstest ppsctl
++
++CFLAGS += -Wall -O2 -D_GNU_SOURCE
++CFLAGS += -I .
++CFLAGS += -ggdb
++
++# -- Actions section ----------------------------------------------------------
++
++.PHONY : all depend dep
++
++all : .depend $(TARGETS)
++
++.depend depend dep :
++ $(CC) $(CFLAGS) -M $(TARGETS:=.c) > .depend
++
++ifeq (.depend,$(wildcard .depend))
++include .depend
++endif
++
++
++# -- Clean section ------------------------------------------------------------
++
++.PHONY : clean
++
++clean :
++ rm -f *.o *~ core .depend
++ rm -f ${TARGETS}
+diff --git a/Documentation/pps/pps.txt b/Documentation/pps/pps.txt
+new file mode 100644
+index 0000000..9538925
+--- /dev/null
++++ b/Documentation/pps/pps.txt
+@@ -0,0 +1,170 @@
++
++ PPS - Pulse Per Second
++ ----------------------
++
++(C) Copyright 2007 Rodolfo Giometti <giometti@enneenne.com>
++
++This program is free software; you can redistribute it and/or modify
++it under the terms of the GNU General Public License as published by
++the Free Software Foundation; either version 2 of the License, or
++(at your option) any later version.
++
++This program is distributed in the hope that it will be useful,
++but WITHOUT ANY WARRANTY; without even the implied warranty of
++MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++GNU General Public License for more details.
++
++
++
++Overview
++--------
++
++LinuxPPS provides a programming interface (API) to define into the
++system several PPS sources.
++
++PPS means "pulse per second" and a PPS source is just a device which
++provides a high precision signal each second so that an application
++can use it to adjust system clock time.
++
++A PPS source can be connected to a serial port (usually to the Data
++Carrier Detect pin) or to a parallel port (ACK-pin) or to a special
++CPU's GPIOs (this is the common case in embedded systems) but in each
++case when a new pulse comes the system must apply to it a timestamp
++and record it for the userland.
++
++Common use is the combination of the NTPD as userland program with a
++GPS receiver as PPS source to obtain a wallclock-time with
++sub-millisecond synchronisation to UTC.
++
++
++RFC considerations
++------------------
++
++While implementing a PPS API as RFC 2783 defines and using an embedded
++CPU GPIO-Pin as physical link to the signal, I encountered a deeper
++problem:
++
++ At startup it needs a file descriptor as argument for the function
++ time_pps_create().
++
++This implies that the source has a /dev/... entry. This assumption is
++ok for the serial and parallel port, where you can do something
++useful besides(!) the gathering of timestamps as it is the central
++task for a PPS-API. But this assumption does not work for a single
++purpose GPIO line. In this case even basic file-related functionality
++(like read() and write()) makes no sense at all and should not be a
++precondition for the use of a PPS-API.
++
++The problem can be simply solved if you consider that a PPS source is
++not always connected with a GPS data source.
++
++So your programs should check if the GPS data source (the serial port
++for instance) is a PPS source too, otherwise they should provide the
++possibility to open another device as PPS source.
++
++In LinuxPPS the PPS sources are simply char devices usually mapped
++into files /dev/pps0, /dev/pps1, etc..
++
++
++Coding example
++--------------
++
++To register a PPS source into the kernel you should define a struct
++pps_source_info_s as follow:
++
++ static struct pps_source_info_s pps_ktimer_info = {
++ name : "ktimer",
++ path : "",
++ mode : PPS_CAPTUREASSERT | PPS_OFFSETASSERT | \
++ PPS_ECHOASSERT | \
++ PPS_CANWAIT | PPS_TSFMT_TSPEC,
++ echo : pps_ktimer_echo,
++ owner : THIS_MODULE,
++ };
++
++and then calling the function pps_register_source() in your
++intialization routine as follow:
++
++ source = pps_register_source(&pps_ktimer_info,
++ PPS_CAPTUREASSERT | PPS_OFFSETASSERT);
++
++The pps_register_source() prototype is:
++
++ int pps_register_source(struct pps_source_info_s *info, int default_params)
++
++where "info" is a pointer to a structure that describes a particular
++PPS source, "default_params" tells the system what the initial default
++parameters for the device should be (is obvious that these parameters
++must be a subset of ones defined into the struct
++pps_source_info_s which describe the capabilities of the driver).
++
++Once you have registered a new PPS source into the system you can
++signal an assert event (for example in the interrupt handler routine)
++just using:
++
++ pps_event(source, PPS_CAPTUREASSERT, ptr);
++
++The same function may also run the defined echo function
++(pps_ktimer_echo(), passing to it the "ptr" pointer) if the user
++asked for that... etc..
++
++Please see the file drivers/pps/clients/ktimer.c for an example code.
++
++
++SYSFS support
++-------------
++
++If the SYSFS filesystem is enabled in the kernel it provides a new class:
++
++ $ ls /sys/class/pps/
++ pps0/ pps1/ pps2/
++
++Every directory is the ID of a PPS sources defined into the system and
++inside you find several files:
++
++ $ ls /sys/class/pps/pps0/
++ assert clear echo mode name path subsystem@ uevent
++
++Inside each "assert" and "clear" file you can find the timestamp and a
++sequence number:
++
++ $ cat /sys/class/pps/pps0/assert
++ 1170026870.983207967#8
++
++Where before the "#" is the timestamp in seconds and after it is the
++sequence number. Other files are:
++
++* echo: reports if the PPS source has an echo function or not;
++
++* mode: reports available PPS functioning modes;
++
++* name: reports the PPS source's name;
++
++* path: reports the PPS source's device path, that is the device the
++ PPS source is connected to (if it exists).
++
++
++Testing the PPS support
++-----------------------
++
++In order to test the PPS support even without specific hardware you can use
++the ktimer driver (see the client subsection in the PPS configuration menu)
++and the userland tools provided into Documentaion/pps/ directory.
++
++Once you have enabled the compilation of ktimer just modprobe it (if
++not statically compiled):
++
++ # modprobe ktimer
++
++and the run ppstest as follow:
++
++ $ ./ppstest /dev/pps0
++ trying PPS source "/dev/pps1"
++ found PPS source "/dev/pps1"
++ ok, found 1 source(s), now start fetching data...
++ source 0 - assert 1186592699.388832443, sequence: 364 - clear 0.000000000, sequence: 0
++ source 0 - assert 1186592700.388931295, sequence: 365 - clear 0.000000000, sequence: 0
++ source 0 - assert 1186592701.389032765, sequence: 366 - clear 0.000000000, sequence: 0
++
++Please, note that to compile userland programs you need the file timepps.h
++(see Documentation/pps/).
+diff --git a/Documentation/pps/ppsctl.c b/Documentation/pps/ppsctl.c
+new file mode 100644
+index 0000000..83fd08a
+--- /dev/null
++++ b/Documentation/pps/ppsctl.c
+@@ -0,0 +1,62 @@
++#include <stdio.h>
++#include <unistd.h>
++#include <stdlib.h>
++#include <errno.h>
++#include <sys/ioctl.h>
++#include <sys/types.h>
++#include <sys/stat.h>
++#include <fcntl.h>
++#include <string.h>
++#include <linux/serial.h>
++
++void usage(char *name)
++{
++ fprintf(stderr, "usage: %s <ttyS> [enable|disable]\n", name);
++
++ exit(EXIT_FAILURE);
++}
++
++int main(int argc, char *argv[])
++{
++ int fd;
++ int ret;
++ struct serial_struct ss;
++
++ if (argc < 2)
++ usage(argv[0]);
++
++ fd = open(argv[1], O_RDWR);
++ if (fd < 0) {
++ perror("open");
++ exit(EXIT_FAILURE);
++ }
++
++ ret = ioctl(fd, TIOCGSERIAL, &ss);
++ if (ret < 0) {
++ perror("ioctl(TIOCGSERIAL)");
++ exit(EXIT_FAILURE);
++ }
++
++ if (argc < 3) { /* just read PPS status */
++ printf("PPS is %sabled\n",
++ ss.flags & ASYNC_HARDPPS_CD ? "en" : "dis");
++ exit(EXIT_SUCCESS);
++ }
++
++ if (argv[2][0] == 'e' || argv[2][0] == '1')
++ ss.flags |= ASYNC_HARDPPS_CD;
++ else if (argv[2][0] == 'd' || argv[2][0] == '0')
++ ss.flags &= ~ASYNC_HARDPPS_CD;
++ else {
++ fprintf(stderr, "invalid state argument \"%s\"\n", argv[2]);
++ exit(EXIT_FAILURE);
++ }
++
++ ret = ioctl(fd, TIOCSSERIAL, &ss);
++ if (ret < 0) {
++ perror("ioctl(TIOCSSERIAL)");
++ exit(EXIT_FAILURE);
++ }
++
++ return 0;
++}
+diff --git a/Documentation/pps/ppsfind b/Documentation/pps/ppsfind
+new file mode 100755
+index 0000000..93c0e17
+--- /dev/null
++++ b/Documentation/pps/ppsfind
+@@ -0,0 +1,17 @@
++#!/bin/sh
++
++SYS="/sys/class/pps/"
++
++if [ $# -lt 1 ] ; then
++ echo "usage: ppsfind <name>" >&2
++ exit 1
++fi
++
++for d in $(ls $SYS) ; do
++ if grep $1 $SYS/$d/name >& /dev/null || \
++ grep $1 $SYS/$d/path >& /dev/null ; then
++ echo "$d: name=$(cat $SYS/$d/name) path=$(cat $SYS/$d/path)"
++ fi
++done
++
++exit 0
+diff --git a/Documentation/pps/ppstest.c b/Documentation/pps/ppstest.c
+new file mode 100644
+index 0000000..d125ffa
+--- /dev/null
++++ b/Documentation/pps/ppstest.c
+@@ -0,0 +1,151 @@
++#include <stdio.h>
++#include <stdlib.h>
++#include <unistd.h>
++#include <errno.h>
++#include <string.h>
++#include <sys/types.h>
++#include <sys/stat.h>
++#include <fcntl.h>
++
++#include <timepps.h>
++
++int find_source(char *path, pps_handle_t *handle, int *avail_mode)
++{
++ pps_params_t params;
++ int ret;
++
++ printf("trying PPS source \"%s\"\n", path);
++
++ /* Try to find the source by using the supplied "path" name */
++ ret = open(path, O_RDWR);
++ if (ret < 0) {
++ fprintf(stderr, "unable to open device \"%s\" (%m)\n", path);
++ return ret;
++ }
++
++ /* Open the PPS source (and check the file descriptor) */
++ ret = time_pps_create(ret, handle);
++ if (ret < 0) {
++ fprintf(stderr, "cannot create a PPS source from device "
++ "\"%s\" (%m)\n", path);
++ return -1;
++ }
++ printf("found PPS source \"%s\"\n", path);
++
++ /* Find out what features are supported */
++ ret = time_pps_getcap(*handle, avail_mode);
++ if (ret < 0) {
++ fprintf(stderr, "cannot get capabilities (%m)\n");
++ return -1;
++ }
++ if ((*avail_mode & PPS_CAPTUREASSERT) == 0) {
++ fprintf(stderr, "cannot CAPTUREASSERT\n");
++ return -1;
++ }
++ if ((*avail_mode & PPS_OFFSETASSERT) == 0) {
++ fprintf(stderr, "cannot OFFSETASSERT\n");
++ return -1;
++ }
++
++ /* Capture assert timestamps, and compensate for a 675 nsec
++ * propagation delay */
++ ret = time_pps_getparams(*handle, ¶ms);
++ if (ret < 0) {
++ fprintf(stderr, "cannot get parameters (%m)\n");
++ return -1;
++ }
++ params.assert_offset.tv_sec = 0;
++ params.assert_offset.tv_nsec = 675;
++ params.mode |= PPS_CAPTUREASSERT | PPS_OFFSETASSERT;
++ ret = time_pps_setparams(*handle, ¶ms);
++ if (ret < 0) {
++ fprintf(stderr, "cannot set parameters (%m)\n");
++ return -1;
++ }
++
++ return 0;
++}
++
++int fetch_source(int i, pps_handle_t *handle, int *avail_mode)
++{
++ struct timespec timeout;
++ pps_info_t infobuf;
++ int ret;
++
++ /* create a zero-valued timeout */
++ timeout.tv_sec = 3;
++ timeout.tv_nsec = 0;
++
++retry:
++ if (*avail_mode & PPS_CANWAIT) /* waits for the next event */
++ ret = time_pps_fetch(*handle, PPS_TSFMT_TSPEC, &infobuf,
++ &timeout);
++ else {
++ sleep(1);
++ ret = time_pps_fetch(*handle, PPS_TSFMT_TSPEC, &infobuf,
++ &timeout);
++ }
++ if (ret < 0) {
++ if (ret == -EINTR) {
++ fprintf(stderr, "time_pps_fetch() got a signal!\n");
++ goto retry;
++ }
++
++ fprintf(stderr, "time_pps_fetch() error %d (%m)\n", ret);
++ return -1;
++ }
++
++ printf("source %d - "
++ "assert %ld.%09ld, sequence: %ld - "
++ "clear %ld.%09ld, sequence: %ld\n",
++ i,
++ infobuf.assert_timestamp.tv_sec,
++ infobuf.assert_timestamp.tv_nsec,
++ infobuf.assert_sequence,
++ infobuf.clear_timestamp.tv_sec,
++ infobuf.clear_timestamp.tv_nsec, infobuf.clear_sequence);
++
++ return 0;
++}
++
++void usage(char *name)
++{
++ fprintf(stderr, "usage: %s <ppsdev> [<ppsdev> ...]\n", name);
++ exit(EXIT_FAILURE);
++}
++
++int main(int argc, char *argv[])
++{
++ int num;
++ pps_handle_t handle[4];
++ int avail_mode[4];
++ int i = 0;
++ int ret;
++
++ /* Check the command line */
++ if (argc < 2)
++ usage(argv[0]);
++
++ for (i = 1; i < argc && i <= 4; i++) {
++ ret = find_source(argv[i], &handle[i - 1], &avail_mode[i - 1]);
++ if (ret < 0)
++ exit(EXIT_FAILURE);
++ }
++
++ num = i - 1;
++ printf("ok, found %d source(s), now start fetching data...\n", num);
++
++ /* loop, printing the most recent timestamp every second or so */
++ while (1) {
++ for (i = 0; i < num; i++) {
++ ret = fetch_source(i, &handle[i], &avail_mode[i]);
++ if (ret < 0 && errno != ETIMEDOUT)
++ exit(EXIT_FAILURE);
++ }
++ }
++
++ for (; i >= 0; i--)
++ time_pps_destroy(handle[i]);
++
++ return 0;
++}
+diff --git a/Documentation/pps/timepps.h b/Documentation/pps/timepps.h
+new file mode 100644
+index 0000000..28ebf4c
+--- /dev/null
++++ b/Documentation/pps/timepps.h
+@@ -0,0 +1,193 @@
++/*
++ * timepps.h -- PPS API main header
++ *
++ * Copyright (C) 2005-2007 Rodolfo Giometti <giometti@linux.it>
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License as published by
++ * the Free Software Foundation; either version 2 of the License, or
++ * (at your option) any later version.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ *
++ * You should have received a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
++ */
++
++#ifndef _SYS_TIMEPPS_H_
++#define _SYS_TIMEPPS_H_
++
++#include <sys/syscall.h>
++#include <unistd.h>
++#include <errno.h>
++#include <linux/pps.h>
++
++/*
++ * New data structures
++ */
++
++struct ntp_fp {
++ unsigned int integral;
++ unsigned int fractional;
++};
++
++union pps_timeu {
++ struct timespec tspec;
++ struct ntp_fp ntpfp;
++ unsigned long longpad[3];
++};
++
++struct pps_info {
++ unsigned long assert_sequence; /* seq. num. of assert event */
++ unsigned long clear_sequence; /* seq. num. of clear event */
++ union pps_timeu assert_tu; /* time of assert event */
++ union pps_timeu clear_tu; /* time of clear event */
++ int current_mode; /* current mode bits */
++};
++
++struct pps_params {
++ int api_version; /* API version # */
++ int mode; /* mode bits */
++ union pps_timeu assert_off_tu; /* offset compensation for assert */
++ union pps_timeu clear_off_tu; /* offset compensation for clear */
++};
++
++typedef int pps_handle_t; /* represents a PPS source */
++typedef unsigned long pps_seq_t; /* sequence number */
++typedef struct ntp_fp ntp_fp_t; /* NTP-compatible time stamp */
++typedef union pps_timeu pps_timeu_t; /* generic data type for time stamps */
++typedef struct pps_info pps_info_t;
++typedef struct pps_params pps_params_t;
++
++#define assert_timestamp assert_tu.tspec
++#define clear_timestamp clear_tu.tspec
++
++#define assert_timestamp_ntpfp assert_tu.ntpfp
++#define clear_timestamp_ntpfp clear_tu.ntpfp
++
++#define assert_offset assert_off_tu.tspec
++#define clear_offset clear_off_tu.tspec
++
++#define assert_offset_ntpfp assert_off_tu.ntpfp
++#define clear_offset_ntpfp clear_off_tu.ntpfp
++
++/*
++ * The PPS API
++ */
++
++static __inline int time_pps_create(int source, pps_handle_t *handle)
++{
++ int ret;
++
++ if (!handle) {
++ errno = EINVAL;
++ return -1;
++ }
++
++ /* First we check if current device is a PPS valid PPS one...
++ */
++ ret = ioctl(source, PPS_CHECK);
++ if (ret) {
++ errno = EOPNOTSUPP;
++ return -1;
++ }
++
++ /* ... then since in LinuxPPS there are no differences between a
++ * "PPS source" and a "PPS handle", we simply return the same value.
++ */
++ *handle = source;
++
++ return 0;
++}
++
++static __inline int time_pps_destroy(pps_handle_t handle)
++{
++ return close(handle);
++}
++
++static __inline int time_pps_getparams(pps_handle_t handle,
++ pps_params_t *ppsparams)
++{
++ int ret;
++ struct pps_kparams __ppsparams;
++
++ ret = ioctl(handle, PPS_GETPARAMS, &__ppsparams);
++
++ ppsparams->api_version = __ppsparams.api_version;
++ ppsparams->mode = __ppsparams.mode;
++ ppsparams->assert_off_tu.tspec.tv_sec = __ppsparams.assert_off_tu.sec;
++ ppsparams->assert_off_tu.tspec.tv_nsec = __ppsparams.assert_off_tu.nsec;
++ ppsparams->clear_off_tu.tspec.tv_sec = __ppsparams.clear_off_tu.sec;
++ ppsparams->clear_off_tu.tspec.tv_nsec = __ppsparams.clear_off_tu.nsec;
++
++ return ret;
++}
++
++static __inline int time_pps_setparams(pps_handle_t handle,
++ const pps_params_t *ppsparams)
++{
++ struct pps_kparams __ppsparams;
++
++ __ppsparams.api_version = ppsparams->api_version;
++ __ppsparams.mode = ppsparams->mode;
++ __ppsparams.assert_off_tu.sec = ppsparams->assert_off_tu.tspec.tv_sec;
++ __ppsparams.assert_off_tu.nsec = ppsparams->assert_off_tu.tspec.tv_nsec;
++ __ppsparams.clear_off_tu.sec = ppsparams->clear_off_tu.tspec.tv_sec;
++ __ppsparams.clear_off_tu.nsec = ppsparams->clear_off_tu.tspec.tv_nsec;
++
++ return ioctl(handle, PPS_SETPARAMS, &__ppsparams);
++}
++
++/* Get capabilities for handle */
++static __inline int time_pps_getcap(pps_handle_t handle, int *mode)
++{
++ return ioctl(handle, PPS_GETCAP, mode);
++}
++
++static __inline int time_pps_fetch(pps_handle_t handle, const int tsformat,
++ pps_info_t *ppsinfobuf,
++ const struct timespec *timeout)
++{
++ struct pps_fdata __fdata;
++ int ret;
++
++ /* Sanity checks */
++ if (tsformat != PPS_TSFMT_TSPEC) {
++ errno = EINVAL;
++ return -1;
++ }
++
++ if (timeout) {
++ __fdata.timeout.sec = timeout->tv_sec;
++ __fdata.timeout.nsec = timeout->tv_nsec;
++ __fdata.timeout.flags = ~PPS_TIME_INVALID;
++ } else
++ __fdata.timeout.flags = PPS_TIME_INVALID;
++
++ ret = ioctl(handle, PPS_FETCH, &__fdata);
++
++ ppsinfobuf->assert_sequence = __fdata.info.assert_sequence;
++ ppsinfobuf->clear_sequence = __fdata.info.clear_sequence;
++ ppsinfobuf->assert_tu.tspec.tv_sec = __fdata.info.assert_tu.sec;
++ ppsinfobuf->assert_tu.tspec.tv_nsec = __fdata.info.assert_tu.nsec;
++ ppsinfobuf->clear_tu.tspec.tv_sec = __fdata.info.clear_tu.sec;
++ ppsinfobuf->clear_tu.tspec.tv_nsec = __fdata.info.clear_tu.nsec;
++ ppsinfobuf->current_mode = __fdata.info.current_mode;
++
++ return ret;
++}
++
++static __inline int time_pps_kcbind(pps_handle_t handle,
++ const int kernel_consumer,
++ const int edge, const int tsformat)
++{
++ /* LinuxPPS doesn't implement kernel consumer feature */
++ errno = EOPNOTSUPP;
++ return -1;
++}
++
++#endif /* _SYS_TIMEPPS_H_ */
+diff --git a/MAINTAINERS b/MAINTAINERS
+index 9a91d9e..f45e974 100644
+--- a/MAINTAINERS
++++ b/MAINTAINERS
+@@ -3011,6 +3011,13 @@ P: James Chapman
+ M: jchapman@katalix.com
+ S: Maintained
+
++PPS SUPPORT
++P: Rodolfo Giometti
++M: giometti@enneenne.com
++W: http://wiki.enneenne.com/index.php/LinuxPPS_support
++L: linuxpps@ml.enneenne.com
++S: Maintained
++
+ PREEMPTIBLE KERNEL
+ P: Robert Love
+ M: rml@tech9.net
+diff --git a/drivers/Kconfig b/drivers/Kconfig
+index 3e1c442..bffc48e 100644
+--- a/drivers/Kconfig
++++ b/drivers/Kconfig
+@@ -52,6 +52,8 @@ source "drivers/i2c/Kconfig"
+
+ source "drivers/spi/Kconfig"
+
++source "drivers/pps/Kconfig"
++
+ source "drivers/w1/Kconfig"
+
+ source "drivers/power/Kconfig"
+diff --git a/drivers/Makefile b/drivers/Makefile
+index f0878b2..2e84e49 100644
+--- a/drivers/Makefile
++++ b/drivers/Makefile
+@@ -63,6 +63,7 @@ obj-$(CONFIG_INPUT) += input/
+ obj-$(CONFIG_I2O) += message/
+ obj-$(CONFIG_RTC_LIB) += rtc/
+ obj-y += i2c/
++obj-$(CONFIG_PPS) += pps/
+ obj-$(CONFIG_W1) += w1/
+ obj-$(CONFIG_POWER_SUPPLY) += power/
+ obj-$(CONFIG_HWMON) += hwmon/
+diff --git a/drivers/char/lp.c b/drivers/char/lp.c
+index 62051f8..e0a8364 100644
+--- a/drivers/char/lp.c
++++ b/drivers/char/lp.c
+@@ -746,6 +746,27 @@ static struct console lpcons = {
+
+ #endif /* console on line printer */
+
++/* Support for PPS signal on the line printer */
++
++#ifdef CONFIG_PPS_CLIENT_LP
++
++static void lp_pps_echo(int source, int event, void *data)
++{
++ struct parport *port = data;
++ unsigned char status = parport_read_status(port);
++
++ /* echo event via SEL bit */
++ parport_write_control(port,
++ parport_read_control(port) | PARPORT_CONTROL_SELECT);
++
++ /* signal no event */
++ if ((status & PARPORT_STATUS_ACK) != 0)
++ parport_write_control(port,
++ parport_read_control(port) & ~PARPORT_CONTROL_SELECT);
++}
++
++#endif
++
+ /* --- initialisation code ------------------------------------- */
+
+ static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
+@@ -817,6 +838,38 @@ static int lp_register(int nr, struct parport *port)
+ }
+ #endif
+
++#ifdef CONFIG_PPS_CLIENT_LP
++ port->pps_info.owner = THIS_MODULE;
++ port->pps_info.dev = port->dev;
++ snprintf(port->pps_info.path, PPS_MAX_NAME_LEN, "/dev/lp%d", nr);
++
++ /* No PPS support if lp port has no IRQ line */
++ if (port->irq != PARPORT_IRQ_NONE) {
++ strncpy(port->pps_info.name, port->name, PPS_MAX_NAME_LEN);
++
++ port->pps_info.mode = PPS_CAPTUREASSERT | PPS_OFFSETASSERT | \
++ PPS_ECHOASSERT | \
++ PPS_CANWAIT | PPS_TSFMT_TSPEC;
++
++ port->pps_info.echo = lp_pps_echo;
++
++ port->pps_source = pps_register_source(&(port->pps_info),
++ PPS_CAPTUREASSERT | PPS_OFFSETASSERT);
++ if (port->pps_source < 0)
++ dev_err(port->dev,
++ "cannot register PPS source \"%s\"\n",
++ port->pps_info.path);
++ else
++ dev_info(port->dev, "PPS source #%d \"%s\" added\n",
++ port->pps_source, port->pps_info.path);
++ } else {
++ port->pps_source = -1;
++ dev_err(port->dev, "PPS support disabled due port \"%s\" is "
++ "in polling mode\n",
++ port->pps_info.path);
++ }
++#endif
++
+ return 0;
+ }
+
+@@ -860,6 +913,14 @@ static void lp_detach (struct parport *port)
+ console_registered = NULL;
+ }
+ #endif /* CONFIG_LP_CONSOLE */
++
++#ifdef CONFIG_PPS_CLIENT_LP
++ if (port->pps_source >= 0) {
++ pps_unregister_source(port->pps_source);
++ dev_dbg(port->dev, "PPS source #%d \"%s\" removed\n",
++ port->pps_source, port->pps_info.path);
++ }
++#endif
+ }
+
+ static struct parport_driver lp_driver = {
+diff --git a/drivers/pps/Kconfig b/drivers/pps/Kconfig
+new file mode 100644
+index 0000000..bfe6621
+--- /dev/null
++++ b/drivers/pps/Kconfig
+@@ -0,0 +1,34 @@
++#
++# PPS support configuration
++#
++
++menu "PPS support"
++
++config PPS
++ tristate "PPS support"
++ depends on EXPERIMENTAL
++ ---help---
++ PPS (Pulse Per Second) is a special pulse provided by some GPS
++ antennae. Userland can use it to get an high time reference.
++
++ Some antennae's PPS signals are connected with the CD (Carrier
++ Detect) pin of the serial line they use to communicate with the
++ host. In this case use the SERIAL_LINE client support.
++
++ Some antennae's PPS signals are connected with some special host
++ inputs so you have to enable the corresponding client support.
++
++ To compile this driver as a module, choose M here: the module
++ will be called pps_core.ko.
++
++config PPS_DEBUG
++ bool "PPS debugging messages"
++ depends on PPS
++ help
++ Say Y here if you want the PPS support to produce a bunch of debug
++ messages to the system log. Select this if you are having a
++ problem with PPS support and want to see more of what is going on.
++
++source drivers/pps/clients/Kconfig
++
++endmenu
+diff --git a/drivers/pps/Makefile b/drivers/pps/Makefile
+new file mode 100644
+index 0000000..d8ec308
+--- /dev/null
++++ b/drivers/pps/Makefile
+@@ -0,0 +1,11 @@
++#
++# Makefile for the PPS core.
++#
++
++pps_core-objs += pps.o kapi.o sysfs.o
++obj-$(CONFIG_PPS) += pps_core.o
++obj-y += clients/
++
++ifeq ($(CONFIG_PPS_DEBUG),y)
++EXTRA_CFLAGS += -DDEBUG
++endif
+diff --git a/drivers/pps/clients/Kconfig b/drivers/pps/clients/Kconfig
+new file mode 100644
+index 0000000..09ba5c3
+--- /dev/null
++++ b/drivers/pps/clients/Kconfig
+@@ -0,0 +1,38 @@
++#
++# PPS clients configuration
++#
++
++if PPS
++
++comment "PPS clients support"
++
++config PPS_CLIENT_KTIMER
++ tristate "Kernel timer client (Testing client, use for debug)"
++ help
++ If you say yes here you get support for a PPS debugging client
++ which uses a kernel timer to generate the PPS signal.
++
++ This driver can also be built as a module. If so, the module
++ will be called ktimer.ko.
++
++comment "UART serial support (forced off)"
++ depends on ! (SERIAL_CORE != n && !(PPS = m && SERIAL_CORE = y))
++
++config PPS_CLIENT_UART
++ bool "UART serial support"
++ depends on SERIAL_CORE != n && !(PPS = m && SERIAL_CORE = y)
++ help
++ If you say yes here you get support for a PPS source connected
++ with the CD (Carrier Detect) pin of your serial port.
++
++comment "Parallel printer support (forced off)"
++ depends on !( PRINTER != n && !(PPS = m && PRINTER = y))
++
++config PPS_CLIENT_LP
++ bool "Parallel printer support"
++ depends on PRINTER != n && !(PPS = m && PRINTER = y)
++ help
++ If you say yes here you get support for a PPS source connected
++ with the interrupt pin of your parallel port.
++
++endif
+diff --git a/drivers/pps/clients/Makefile b/drivers/pps/clients/Makefile
+new file mode 100644
+index 0000000..f3c1e39
+--- /dev/null
++++ b/drivers/pps/clients/Makefile
+@@ -0,0 +1,9 @@
++#
++# Makefile for PPS clients.
++#
++
++obj-$(CONFIG_PPS_CLIENT_KTIMER) += ktimer.o
++
++ifeq ($(CONFIG_PPS_DEBUG),y)
++EXTRA_CFLAGS += -DDEBUG
++endif
+diff --git a/drivers/pps/clients/ktimer.c b/drivers/pps/clients/ktimer.c
+new file mode 100644
+index 0000000..4d613ab
+--- /dev/null
++++ b/drivers/pps/clients/ktimer.c
+@@ -0,0 +1,114 @@
++/*
++ * ktimer.c -- kernel timer test client
++ *
++ *
++ * Copyright (C) 2005-2006 Rodolfo Giometti <giometti@linux.it>
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License as published by
++ * the Free Software Foundation; either version 2 of the License, or
++ * (at your option) any later version.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ *
++ * You should have received a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
++ */
++
++
++#include <linux/kernel.h>
++#include <linux/module.h>
++#include <linux/init.h>
++#include <linux/time.h>
++#include <linux/timer.h>
++
++#include <linux/pps.h>
++
++/*
++ * Global variables
++ */
++
++static int source;
++static struct timer_list ktimer;
++
++/*
++ * The kernel timer
++ */
++
++static void pps_ktimer_event(unsigned long ptr)
++{
++ pr_info("PPS event at %lu\n", jiffies);
++
++ pps_event(source, PPS_CAPTUREASSERT, NULL);
++
++ mod_timer(&ktimer, jiffies + HZ);
++}
++
++/*
++ * The echo function
++ */
++
++static void pps_ktimer_echo(int source, int event, void *data)
++{
++ pr_info("echo %s %s for source %d\n",
++ event & PPS_CAPTUREASSERT ? "assert" : "",
++ event & PPS_CAPTURECLEAR ? "clear" : "",
++ source);
++}
++
++/*
++ * The PPS info struct
++ */
++
++static struct pps_source_info pps_ktimer_info = {
++ name : "ktimer",
++ path : "",
++ mode : PPS_CAPTUREASSERT | PPS_OFFSETASSERT | \
++ PPS_ECHOASSERT | \
++ PPS_CANWAIT | PPS_TSFMT_TSPEC,
++ echo : pps_ktimer_echo,
++ owner : THIS_MODULE,
++};
++
++/*
++ * Module staff
++ */
++
++static void __exit pps_ktimer_exit(void)
++{
++ del_timer_sync(&ktimer);
++ pps_unregister_source(source);
++
++ pr_info("ktimer PPS source unregistered\n");
++}
++
++static int __init pps_ktimer_init(void)
++{
++ int ret;
++
++ ret = pps_register_source(&pps_ktimer_info,
++ PPS_CAPTUREASSERT | PPS_OFFSETASSERT);
++ if (ret < 0) {
++ printk(KERN_ERR "cannot register ktimer source\n");
++ return ret;
++ }
++ source = ret;
++
++ setup_timer(&ktimer, pps_ktimer_event, 0);
++ mod_timer(&ktimer, jiffies + HZ);
++
++ pr_info("ktimer PPS source registered at %d\n", source);
++
++ return 0;
++}
++
++module_init(pps_ktimer_init);
++module_exit(pps_ktimer_exit);
++
++MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
++MODULE_DESCRIPTION("dummy PPS source by using a kernel timer (just for debug)");
++MODULE_LICENSE("GPL");
+diff --git a/drivers/pps/kapi.c b/drivers/pps/kapi.c
+new file mode 100644
+index 0000000..67290d5
+--- /dev/null
++++ b/drivers/pps/kapi.c
+@@ -0,0 +1,271 @@
++/*
++ * kapi.c -- kernel API
++ *
++ *
++ * Copyright (C) 2005-2007 Rodolfo Giometti <giometti@linux.it>
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License as published by
++ * the Free Software Foundation; either version 2 of the License, or
++ * (at your option) any later version.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ *
++ * You should have received a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
++ */
++
++
++#include <linux/kernel.h>
++#include <linux/module.h>
++#include <linux/init.h>
++#include <linux/sched.h>
++#include <linux/time.h>
++#include <linux/spinlock.h>
++#include <linux/idr.h>
++#include <linux/fs.h>
++#include <linux/pps.h>
++
++/*
++ * Local variables
++ */
++
++static spinlock_t idr_lock = SPIN_LOCK_UNLOCKED;
++static DEFINE_IDR(pps_idr);
++
++/*
++ * Local functions
++ */
++
++static void pps_add_offset(struct pps_ktime *ts, struct pps_ktime *offset)
++{
++ ts->nsec += offset->nsec;
++ if (ts->nsec >= NSEC_PER_SEC) {
++ ts->nsec -= NSEC_PER_SEC;
++ ts->sec++;
++ } else if (ts->nsec < 0) {
++ ts->nsec += NSEC_PER_SEC;
++ ts->sec--;
++ }
++ ts->sec += offset->sec;
++}
++
++/*
++ * Exported functions
++ */
++
++int pps_register_source(struct pps_source_info *info, int default_params)
++{
++ struct pps_device *pps;
++ int id;
++ int err;
++
++ /* Sanity checks */
++ if ((info->mode & default_params) != default_params) {
++ printk(KERN_ERR "pps: %s: unsupported default parameters\n",
++ info->name);
++ err = -EINVAL;
++ goto pps_register_source_exit;
++ }
++ if ((info->mode & (PPS_ECHOASSERT | PPS_ECHOCLEAR)) != 0 &&
++ info->echo == NULL) {
++ printk(KERN_ERR "pps: %s: echo function is not defined\n",
++ info->name);
++ err = -EINVAL;
++ goto pps_register_source_exit;
++ }
++ if ((info->mode & (PPS_TSFMT_TSPEC | PPS_TSFMT_NTPFP)) == 0) {
++ printk(KERN_ERR "pps: %s: unspecified time format\n",
++ info->name);
++ err = -EINVAL;
++ goto pps_register_source_exit;
++ }
++
++ /* Allocate memory for the new PPS source struct */
++ pps = kzalloc(sizeof(struct pps_device), GFP_KERNEL);
++ if (pps == NULL) {
++ err = -ENOMEM;
++ goto pps_register_source_exit;
++ }
++
++ /* Get new ID for the new PPS source */
++ if (idr_pre_get(&pps_idr, GFP_KERNEL) == 0) {
++ err = -ENOMEM;
++ goto kfree_pps;
++ }
++
++ spin_lock_irq(&idr_lock);
++ err = idr_get_new(&pps_idr, pps, &id);
++ spin_unlock_irq(&idr_lock);
++
++ if (err < 0)
++ goto kfree_pps;
++
++ id = id & MAX_ID_MASK;
++ if (id >= PPS_MAX_SOURCES) {
++ printk(KERN_ERR "pps: %s: too much PPS sources in the system\n",
++ info->name);
++ err = -EBUSY;
++ goto free_idr;
++ }
++
++ pps->id = id;
++ pps->params.api_version = PPS_API_VERS;
++ pps->params.mode = default_params;
++ pps->info = *info;
++
++ init_waitqueue_head(&pps->queue);
++ spin_lock_init(&pps->lock);
++ atomic_set(&pps->usage, 0);
++ init_waitqueue_head(&pps->usage_queue);
++
++ /* Create the char device */
++ err = pps_register_cdev(pps);
++ if (err < 0) {
++ printk(KERN_ERR "pps: %s: unable to create char device\n",
++ info->name);
++ goto free_idr;
++ }
++
++ /* Create the sysfs entry */
++ err = pps_sysfs_create_source_entry(pps);
++ if (err < 0) {
++ printk(KERN_ERR "pps: %s: unable to create sysfs entries\n",
++ info->name);
++ goto unregister_cdev;
++ }
++
++ pr_info("new PPS source %s at ID %d\n", info->name, id);
++
++ return id;
++
++unregister_cdev:
++ pps_unregister_cdev(pps);
++
++free_idr:
++ spin_lock_irq(&idr_lock);
++ idr_remove(&pps_idr, id);
++ spin_unlock_irq(&idr_lock);
++
++kfree_pps:
++ kfree(pps);
++
++pps_register_source_exit:
++ printk(KERN_ERR "pps: %s: unable to register source\n", info->name);
++
++ return err;
++}
++EXPORT_SYMBOL(pps_register_source);
++
++void pps_unregister_source(int source)
++{
++ struct pps_device *pps;
++
++ spin_lock_irq(&idr_lock);
++ pps = idr_find(&pps_idr, source);
++
++ if (!pps) {
++ spin_unlock_irq(&idr_lock);
++ return;
++ }
++
++ /* This should be done first in order to deny IRQ handlers
++ * to access PPS structs
++ */
++
++ idr_remove(&pps_idr, pps->id);
++ spin_unlock_irq(&idr_lock);
++
++ wait_event(pps->usage_queue, atomic_read(&pps->usage) == 0);
++
++ pps_sysfs_remove_source_entry(pps);
++ pps_unregister_cdev(pps);
++ kfree(pps);
++}
++EXPORT_SYMBOL(pps_unregister_source);
++
++void pps_event(int source, int event, void *data)
++{
++ struct pps_device *pps;
++ struct timespec __ts;
++ struct pps_ktime ts;
++ unsigned long flags;
++
++ /* First of all we get the time stamp... */
++ getnstimeofday(&__ts);
++
++ /* ... and translate it to PPS time data struct */
++ ts.sec = __ts.tv_sec;
++ ts.nsec = __ts.tv_nsec;
++
++ if ((event & (PPS_CAPTUREASSERT | PPS_CAPTURECLEAR)) == 0 ) {
++ printk(KERN_ERR "pps: unknown event (%x) for source %d\n",
++ event, source);
++ return;
++ }
++
++ spin_lock_irqsave(&idr_lock, flags);
++ pps = idr_find(&pps_idr, source);
++
++ /* If we find a valid PPS source we lock it before leaving
++ * the lock!
++ */
++ if (pps)
++ atomic_inc(&pps->usage);
++ spin_unlock_irqrestore(&idr_lock, flags);
++
++ if (!pps)
++ return;
++
++ pr_debug("PPS event on source %d at at %llu.%06u\n",
++ pps->id, ts.sec, ts.nsec);
++
++ spin_lock_irqsave(&pps->lock, flags);
++
++ /* Must call the echo function? */
++ if ((pps->params.mode & (PPS_ECHOASSERT | PPS_ECHOCLEAR)))
++ pps->info.echo(source, event, data);
++
++ /* Check the event */
++ pps->current_mode = pps->params.mode;
++ if (event & PPS_CAPTUREASSERT) {
++ /* We have to add an offset? */
++ if (pps->params.mode & PPS_OFFSETASSERT)
++ pps_add_offset(&ts, &pps->params.assert_off_tu);
++
++ /* Save the time stamp */
++ pps->assert_tu = ts;
++ pps->assert_sequence++;
++ pr_debug("capture assert seq #%u for source %d\n",
++ pps->assert_sequence, source);
++ }
++ if (event & PPS_CAPTURECLEAR) {
++ /* We have to add an offset? */
++ if (pps->params.mode & PPS_OFFSETCLEAR)
++ pps_add_offset(&ts, &pps->params.clear_off_tu);
++
++ /* Save the time stamp */
++ pps->clear_tu = ts;
++ pps->clear_sequence++;
++ pr_debug("capture clear seq #%u for source %d\n",
++ pps->clear_sequence, source);
++ }
++
++ pps->go = ~0;
++ wake_up_interruptible(&pps->queue);
++
++ kill_fasync(&pps->async_queue, SIGIO, POLL_IN);
++
++ spin_unlock_irqrestore(&pps->lock, flags);
++
++ /* Now we can release the PPS source for (possible) deregistration */
++ spin_lock_irqsave(&idr_lock, flags);
++ atomic_dec(&pps->usage);
++ wake_up_all(&pps->usage_queue);
++ spin_unlock_irqrestore(&idr_lock, flags);
++}
++EXPORT_SYMBOL(pps_event);
+diff --git a/drivers/pps/pps.c b/drivers/pps/pps.c
+new file mode 100644
+index 0000000..52de2f1
+--- /dev/null
++++ b/drivers/pps/pps.c
+@@ -0,0 +1,332 @@
++/*
++ * pps.c -- Main PPS support file
++ *
++ *
++ * Copyright (C) 2005-2007 Rodolfo Giometti <giometti@linux.it>
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License as published by
++ * the Free Software Foundation; either version 2 of the License, or
++ * (at your option) any later version.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ *
++ * You should have received a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
++ */
++
++
++#include <linux/kernel.h>
++#include <linux/version.h>
++#include <linux/module.h>
++#include <linux/init.h>
++#include <linux/sched.h>
++#include <linux/uaccess.h>
++#include <linux/cdev.h>
++#include <linux/poll.h>
++#include <linux/pps.h>
++
++/*
++ * Local variables
++ */
++
++static dev_t pps_devt;
++static struct class *pps_class;
++
++/*
++ * Char device methods
++ */
++
++static unsigned int pps_cdev_poll(struct file *file, poll_table *wait)
++{
++ struct pps_device *pps = file->private_data;
++
++ poll_wait(file, &pps->queue, wait);
++
++ return POLLIN | POLLRDNORM;
++}
++
++static int pps_cdev_fasync(int fd, struct file *file, int on)
++{
++ struct pps_device *pps = file->private_data;
++ return fasync_helper(fd, file, on, &pps->async_queue);
++}
++
++static int pps_cdev_ioctl(struct inode *inode, struct file *file,
++ unsigned int cmd, unsigned long arg)
++{
++ struct pps_device *pps = file->private_data;
++ struct pps_kparams params;
++ struct pps_fdata fdata;
++ unsigned long ticks;
++ void __user *uarg = (void __user *) arg;
++ int __user *iuarg = (int __user *) arg;
++ int err;
++
++ switch (cmd) {
++ case PPS_CHECK:
++
++ /* This does nothing but signal we are a PPS source... */
++
++ return 0;
++
++ case PPS_GETPARAMS:
++ pr_debug("PPS_GETPARAMS: source %d\n", pps->id);
++
++ /* Sanity checks */
++ if (!uarg)
++ return -EINVAL;
++
++ /* Return current parameters */
++ err = copy_to_user(uarg, &pps->params,
++ sizeof(struct pps_kparams));
++ if (err)
++ return -EFAULT;
++
++ break;
++
++ case PPS_SETPARAMS:
++ pr_debug("PPS_SETPARAMS: source %d\n", pps->id);
++
++ /* Check the capabilities */
++ if (!capable(CAP_SYS_TIME))
++ return -EPERM;
++
++ /* Sanity checks */
++ if (!uarg)
++ return -EINVAL;
++ err = copy_from_user(¶ms, uarg, sizeof(struct pps_kparams));
++ if (err)
++ return -EFAULT;
++ if (!(params.mode & (PPS_CAPTUREASSERT | PPS_CAPTURECLEAR))) {
++ pr_debug("capture mode unspecified (%x)\n",
++ params.mode);
++ return -EINVAL;
++ }
++
++ /* Check for supported capabilities */
++ if ((params.mode & ~pps->info.mode) != 0) {
++ pr_debug("unsupported capabilities (%x)\n",
++ params.mode);
++ return -EINVAL;
++ }
++
++ spin_lock_irq(&pps->lock);
++
++ /* Save the new parameters */
++ pps->params = params;
++
++ /* Restore the read only parameters */
++ if ((params.mode & (PPS_TSFMT_TSPEC | PPS_TSFMT_NTPFP)) == 0) {
++ /* section 3.3 of RFC 2783 interpreted */
++ pr_debug("time format unspecified (%x)\n",
++ params.mode);
++ pps->params.mode |= PPS_TSFMT_TSPEC;
++ }
++ if (pps->info.mode & PPS_CANWAIT)
++ pps->params.mode |= PPS_CANWAIT;
++ pps->params.api_version = PPS_API_VERS;
++
++ spin_unlock_irq(&pps->lock);
++
++ break;
++
++ case PPS_GETCAP:
++ pr_debug("PPS_GETCAP: source %d\n", pps->id);
++
++ /* Sanity checks */
++ if (!uarg)
++ return -EINVAL;
++
++ err = put_user(pps->info.mode, iuarg);
++ if (err)
++ return -EFAULT;
++
++ break;
++
++ case PPS_FETCH:
++ pr_debug("PPS_FETCH: source %d\n", pps->id);
++
++ if (!uarg)
++ return -EINVAL;
++ err = copy_from_user(&fdata, uarg, sizeof(struct pps_fdata));
++ if (err)
++ return -EFAULT;
++
++ pps->go = 0;
++
++ /* Manage the timeout */
++ if (fdata.timeout.flags & PPS_TIME_INVALID)
++ err = wait_event_interruptible(pps->queue, pps->go);
++ else {
++ pr_debug("timeout %lld.%09d\n",
++ fdata.timeout.sec, fdata.timeout.nsec);
++ ticks = fdata.timeout.sec * HZ;
++ ticks += fdata.timeout.nsec / (NSEC_PER_SEC / HZ);
++
++ if (ticks != 0) {
++ err = wait_event_interruptible_timeout(
++ pps->queue, pps->go, ticks);
++ if (err == 0)
++ return -ETIMEDOUT;
++ }
++ }
++
++ /* Check for pending signals */
++ if (err == -ERESTARTSYS) {
++ pr_debug("pending signal caught\n");
++ return -EINTR;
++ }
++
++ /* Return the fetched timestamp */
++ spin_lock_irq(&pps->lock);
++
++ fdata.info.assert_sequence = pps->assert_sequence;
++ fdata.info.clear_sequence = pps->clear_sequence;
++ fdata.info.assert_tu = pps->assert_tu;
++ fdata.info.clear_tu = pps->clear_tu;
++ fdata.info.current_mode = pps->current_mode;
++
++ spin_unlock_irq(&pps->lock);
++
++ err = copy_to_user(uarg, &fdata, sizeof(struct pps_fdata));
++ if (err)
++ return -EFAULT;
++
++ break;
++
++ default:
++ return -ENOTTY;
++ break;
++ }
++
++ return 0;
++}
++
++static int pps_cdev_open(struct inode *inode, struct file *file)
++{
++ struct pps_device *pps = container_of(inode->i_cdev,
++ struct pps_device, cdev);
++
++ /* Lock the PPS source against (possible) deregistration */
++ atomic_inc(&pps->usage);
++
++ file->private_data = pps;
++
++ return 0;
++}
++
++static int pps_cdev_release(struct inode *inode, struct file *file)
++{
++ struct pps_device *pps = file->private_data;
++
++ /* Free the PPS source and wake up (possible) deregistration */
++ atomic_dec(&pps->usage);
++ wake_up_all(&pps->usage_queue);
++
++ return 0;
++}
++
++/*
++ * Char device stuff
++ */
++
++static const struct file_operations pps_cdev_fops = {
++ .owner = THIS_MODULE,
++ .llseek = no_llseek,
++ .poll = pps_cdev_poll,
++ .fasync = pps_cdev_fasync,
++ .ioctl = pps_cdev_ioctl,
++ .open = pps_cdev_open,
++ .release = pps_cdev_release,
++};
++
++int pps_register_cdev(struct pps_device *pps)
++{
++ int err;
++
++ pps->devno = MKDEV(MAJOR(pps_devt), pps->id);
++ cdev_init(&pps->cdev, &pps_cdev_fops);
++ pps->cdev.owner = pps->info.owner;
++
++ err = cdev_add(&pps->cdev, pps->devno, 1);
++ if (err) {
++ printk(KERN_ERR "pps: %s: failed to add char device %d:%d\n",
++ pps->info.name, MAJOR(pps_devt), pps->id);
++ return err;
++ }
++ pps->dev = device_create(pps_class, pps->info.dev, pps->devno,
++ "pps%d", pps->id);
++ if (err)
++ goto del_cdev;
++ dev_set_drvdata(pps->dev, pps);
++
++ pr_debug("source %s got cdev (%d:%d)\n", pps->info.name,
++ MAJOR(pps_devt), pps->id);
++
++ return 0;
++
++del_cdev:
++ cdev_del(&pps->cdev);
++
++ return err;
++}
++
++void pps_unregister_cdev(struct pps_device *pps)
++{
++ device_destroy(pps_class, pps->devno);
++ cdev_del(&pps->cdev);
++}
++
++/*
++ * Module staff
++ */
++
++static void __exit pps_exit(void)
++{
++ class_destroy(pps_class);
++
++ if (pps_devt)
++ unregister_chrdev_region(pps_devt, PPS_MAX_SOURCES);
++
++ pr_info("LinuxPPS API ver. %d removed\n", PPS_API_VERS);
++}
++
++static int __init pps_init(void)
++{
++ int err;
++
++ pps_class = class_create(THIS_MODULE, "pps");
++ if (!pps_class) {
++ printk(KERN_ERR "pps: ailed to allocate class\n");
++ return -ENOMEM;
++ }
++
++ err = alloc_chrdev_region(&pps_devt, 0, PPS_MAX_SOURCES, "pps");
++ if (err < 0) {
++ printk(KERN_ERR "pps: failed to allocate char device region\n");
++ goto remove_class;
++ }
++
++ pr_info("LinuxPPS API ver. %d registered\n", PPS_API_VERS);
++ pr_info("Software ver. %s - Copyright 2005-2007 Rodolfo Giometti "
++ "<giometti@linux.it>\n", PPS_VERSION);
++
++ return 0;
++
++remove_class:
++ class_destroy(pps_class);
++
++ return err;
++}
++
++subsys_initcall(pps_init);
++module_exit(pps_exit);
++
++MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
++MODULE_DESCRIPTION("LinuxPPS support (RFC 2783) - ver. " PPS_VERSION);
++MODULE_LICENSE("GPL");
+diff --git a/drivers/pps/sysfs.c b/drivers/pps/sysfs.c
+new file mode 100644
+index 0000000..8541be7
+--- /dev/null
++++ b/drivers/pps/sysfs.c
+@@ -0,0 +1,124 @@
++/*
++ * sysfs.c -- sysfs support
++ *
++ *
++ * Copyright (C) 2007 Rodolfo Giometti <giometti@linux.it>
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License as published by
++ * the Free Software Foundation; either version 2 of the License, or
++ * (at your option) any later version.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ *
++ * You should have received a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
++ */
++
++
++#include <linux/device.h>
++#include <linux/module.h>
++#include <linux/string.h>
++#include <linux/pps.h>
++
++/*
++ * Attribute functions
++ */
++
++static ssize_t pps_show_assert(struct device *dev,
++ struct device_attribute *attr, char *buf)
++{
++ struct pps_device *pps = dev_get_drvdata(dev);
++
++ return sprintf(buf, "%lld.%09d#%d\n",
++ pps->assert_tu.sec, pps->assert_tu.nsec,
++ pps->assert_sequence);
++}
++DEVICE_ATTR(assert, S_IRUGO, pps_show_assert, NULL);
++
++static ssize_t pps_show_clear(struct device *dev,
++ struct device_attribute *attr, char *buf)
++{
++ struct pps_device *pps = dev_get_drvdata(dev);
++
++ return sprintf(buf, "%lld.%09d#%d\n",
++ pps->clear_tu.sec, pps->clear_tu.nsec,
++ pps->clear_sequence);
++}
++DEVICE_ATTR(clear, S_IRUGO, pps_show_clear, NULL);
++
++static ssize_t pps_show_mode(struct device *dev,
++ struct device_attribute *attr, char *buf)
++{
++ struct pps_device *pps = dev_get_drvdata(dev);
++
++ return sprintf(buf, "%4x\n", pps->info.mode);
++}
++DEVICE_ATTR(mode, S_IRUGO, pps_show_mode, NULL);
++
++static ssize_t pps_show_echo(struct device *dev,
++ struct device_attribute *attr, char *buf)
++{
++ struct pps_device *pps = dev_get_drvdata(dev);
++
++ return sprintf(buf, "%d\n", !!pps->info.echo);
++}
++DEVICE_ATTR(echo, S_IRUGO, pps_show_echo, NULL);
++
++static ssize_t pps_show_name(struct device *dev,
++ struct device_attribute *attr, char *buf)
++{
++ struct pps_device *pps = dev_get_drvdata(dev);
++
++ return sprintf(buf, "%s\n", pps->info.name);
++}
++DEVICE_ATTR(name, S_IRUGO, pps_show_name, NULL);
++
++static ssize_t pps_show_path(struct device *dev,
++ struct device_attribute *attr, char *buf)
++{
++ struct pps_device *pps = dev_get_drvdata(dev);
++
++ return sprintf(buf, "%s\n", pps->info.path);
++}
++DEVICE_ATTR(path, S_IRUGO, pps_show_path, NULL);
++
++/*
++ * Public functions
++ */
++
++void pps_sysfs_remove_source_entry(struct pps_device *pps)
++{
++ /* Delete info files */
++ if (pps->info.mode & PPS_CAPTUREASSERT)
++ device_remove_file(pps->dev, &dev_attr_assert);
++
++ if (pps->info.mode & PPS_CAPTURECLEAR)
++ device_remove_file(pps->dev, &dev_attr_clear);
++
++ device_remove_file(pps->dev, &dev_attr_mode);
++ device_remove_file(pps->dev, &dev_attr_echo);
++ device_remove_file(pps->dev, &dev_attr_name);
++ device_remove_file(pps->dev, &dev_attr_path);
++}
++
++int pps_sysfs_create_source_entry(struct pps_device *pps)
++{
++ /* Create file "assert" and "clear" according to source capability */
++ if (pps->info.mode & PPS_CAPTUREASSERT)
++ device_create_file(pps->dev, &dev_attr_assert);
++
++ if (pps->info.mode & PPS_CAPTURECLEAR)
++ device_create_file(pps->dev, &dev_attr_clear);
++
++ device_create_file(pps->dev, &dev_attr_mode);
++ device_create_file(pps->dev, &dev_attr_echo);
++ device_create_file(pps->dev, &dev_attr_name);
++ device_create_file(pps->dev, &dev_attr_path);
++
++ return 0;
++}
+diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
+index f94109c..a5e83f8 100644
+--- a/drivers/serial/8250.c
++++ b/drivers/serial/8250.c
+@@ -2118,6 +2118,8 @@ serial8250_set_termios(struct uart_port *port, struct ktermios *termios,
+ up->ier |= UART_IER_MSI;
+ if (up->capabilities & UART_CAP_UUE)
+ up->ier |= UART_IER_UUE | UART_IER_RTOIE;
++ if (up->port.flags & UPF_HARDPPS_CD)
++ up->ier |= UART_IER_MSI; /* enable interrupts */
+
+ serial_out(up, UART_IER, up->ier);
+
+diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
+index a055f58..a40b87c 100644
+--- a/drivers/serial/serial_core.c
++++ b/drivers/serial/serial_core.c
+@@ -33,6 +33,7 @@
+ #include <linux/serial.h> /* for serial_state and serial_icounter_struct */
+ #include <linux/delay.h>
+ #include <linux/mutex.h>
++#include <linux/pps.h>
+
+ #include <asm/irq.h>
+ #include <asm/uaccess.h>
+@@ -633,6 +634,54 @@ static int uart_get_info(struct uart_state *state,
+ return 0;
+ }
+
++#ifdef CONFIG_PPS_CLIENT_UART
++
++static int
++uart_register_pps_port(struct uart_state *state, struct uart_port *port)
++{
++ struct tty_driver *drv = port->info->tty->driver;
++ int ret;
++
++ state->pps_info.owner = THIS_MODULE;
++ state->pps_info.dev = port->dev;
++ snprintf(state->pps_info.name, PPS_MAX_NAME_LEN, "%s%d",
++ drv->driver_name, port->line);
++ snprintf(state->pps_info.path, PPS_MAX_NAME_LEN, "/dev/%s%d",
++ drv->name, port->line);
++
++ state->pps_info.mode = PPS_CAPTUREBOTH | \
++ PPS_OFFSETASSERT | PPS_OFFSETCLEAR | \
++ PPS_CANWAIT | PPS_TSFMT_TSPEC;
++
++ ret = pps_register_source(&state->pps_info, PPS_CAPTUREBOTH | \
++ PPS_OFFSETASSERT | PPS_OFFSETCLEAR);
++ if (ret < 0) {
++ dev_err(port->dev, "cannot register PPS source \"%s\"\n",
++ state->pps_info.path);
++ return ret;
++ }
++ port->pps_source = ret;
++ dev_dbg(port->dev, "PPS source #%d \"%s\" added\n",
++ port->pps_source, state->pps_info.path);
++
++ return 0;
++}
++
++static void
++uart_unregister_pps_port(struct uart_state *state, struct uart_port *port)
++{
++ pps_unregister_source(port->pps_source);
++ dev_dbg(port->dev, "PPS source #%d \"%s\" removed\n",
++ port->pps_source, state->pps_info.path);
++}
++
++#else
++
++#define uart_register_pps_port(state, port) do { } while (0)
++#define uart_unregister_pps_port(state, port) do { } while (0)
++
++#endif /* CONFIG_PPS_CLIENT_UART */
++
+ static int uart_set_info(struct uart_state *state,
+ struct serial_struct __user *newinfo)
+ {
+@@ -807,11 +856,19 @@ static int uart_set_info(struct uart_state *state,
+ (port->flags & UPF_LOW_LATENCY) ? 1 : 0;
+
+ check_and_exit:
++ /* PPS support enabled/disabled? */
++ if ((old_flags & UPF_HARDPPS_CD) != (new_flags & UPF_HARDPPS_CD)) {
++ if (new_flags & UPF_HARDPPS_CD)
++ uart_register_pps_port(state, port);
++ else
++ uart_unregister_pps_port(state, port);
++ }
++
+ retval = 0;
+ if (port->type == PORT_UNKNOWN)
+ goto exit;
+ if (state->info->flags & UIF_INITIALIZED) {
+- if (((old_flags ^ port->flags) & UPF_SPD_MASK) ||
++ if (((old_flags ^ port->flags) & (UPF_SPD_MASK|UPF_HARDPPS_CD)) ||
+ old_custom_divisor != port->custom_divisor) {
+ /*
+ * If they're setting up a custom divisor or speed,
+@@ -2110,6 +2167,12 @@ uart_configure_port(struct uart_driver *drv, struct uart_state *state,
+ port->ops->config_port(port, flags);
+ }
+
++ /*
++ * Add the PPS support for the current port.
++ */
++ if (port->flags & UPF_HARDPPS_CD)
++ uart_register_pps_port(state, port);
++
+ if (port->type != PORT_UNKNOWN) {
+ unsigned long flags;
+
+@@ -2359,6 +2422,12 @@ int uart_remove_one_port(struct uart_driver *drv, struct uart_port *port)
+ mutex_unlock(&state->mutex);
+
+ /*
++ * Remove PPS support from the current port.
++ */
++ if (port->flags & UPF_HARDPPS_CD)
++ uart_unregister_pps_port(state, port);
++
++ /*
+ * Remove the devices from the tty layer
+ */
+ tty_unregister_device(drv->tty_driver, port->line);
+diff --git a/include/linux/Kbuild b/include/linux/Kbuild
+index 818cc3a..0a9394f 100644
+--- a/include/linux/Kbuild
++++ b/include/linux/Kbuild
+@@ -295,6 +295,7 @@ unifdef-y += pmu.h
+ unifdef-y += poll.h
+ unifdef-y += ppp_defs.h
+ unifdef-y += ppp-comp.h
++unifdef-y += pps.h
+ unifdef-y += ptrace.h
+ unifdef-y += qnx4_fs.h
+ unifdef-y += quota.h
+diff --git a/include/linux/parport.h b/include/linux/parport.h
+index 9cdd694..549de6e 100644
+--- a/include/linux/parport.h
++++ b/include/linux/parport.h
+@@ -100,6 +100,7 @@ typedef enum {
+ #include <linux/proc_fs.h>
+ #include <linux/spinlock.h>
+ #include <linux/wait.h>
++#include <linux/pps.h>
+ #include <asm/system.h>
+ #include <asm/ptrace.h>
+ #include <asm/semaphore.h>
+@@ -327,6 +328,11 @@ struct parport {
+
+ struct list_head full_list;
+ struct parport *slaves[3];
++
++#ifdef CONFIG_PPS_CLIENT_LP
++ struct pps_source_info pps_info;
++ int pps_source; /* PPS source ID */
++#endif
+ };
+
+ #define DEFAULT_SPIN_TIME 500 /* us */
+@@ -517,6 +523,12 @@ extern int parport_daisy_select (struct parport *port, int daisy, int mode);
+ /* Lowlevel drivers _can_ call this support function to handle irqs. */
+ static __inline__ void parport_generic_irq(int irq, struct parport *port)
+ {
++#ifdef CONFIG_PPS_CLIENT_LP
++ pps_event(port->pps_source, PPS_CAPTUREASSERT, port);
++ dev_dbg(port->dev, "PPS assert at %lu on source #%d\n",
++ jiffies, port->pps_source);
++#endif
++
+ parport_ieee1284_interrupt (irq, port);
+ read_lock(&port->cad_lock);
+ if (port->cad && port->cad->irq_func)
+diff --git a/include/linux/pps.h b/include/linux/pps.h
+new file mode 100644
+index 0000000..5bdb593
+--- /dev/null
++++ b/include/linux/pps.h
+@@ -0,0 +1,196 @@
++/*
++ * pps.h -- PPS API kernel header.
++ *
++ *
++ * Copyright (C) 2005-2007 Rodolfo Giometti <giometti@linux.it>
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License as published by
++ * the Free Software Foundation; either version 2 of the License, or
++ * (at your option) any later version.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ *
++ * You should have received a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
++ */
++
++
++#ifndef _PPS_H_
++#define _PPS_H_
++
++/* Implementation note: the logical states ``assert'' and ``clear''
++ * are implemented in terms of the chip register, i.e. ``assert''
++ * means the bit is set. */
++
++/*
++ * 3.2 New data structures
++ */
++
++#ifndef __KERNEL__
++#include <linux/types.h>
++#include <sys/time.h>
++#include <sys/ioctl.h>
++#else
++#include <linux/time.h>
++#endif
++
++#define PPS_API_VERS 1
++#define PPS_MAX_NAME_LEN 32
++
++/* 32-bit vs. 64-bit compatibility.
++ *
++ * 0n i386, the alignment of a uint64_t is only 4 bytes, while on most other
++ * architectures it's 8 bytes. On i386, there will be no padding between the
++ * two consecutive 'struct pps_ktime' members of struct pps_kinfo and struct
++ * pps_kparams. But on most platforms there will be padding to ensure correct
++ * alignment.
++ *
++ * The simple fix is probably to add an explicit padding.
++ * [David Woodhouse]
++ */
++struct pps_ktime {
++ __u64 sec;
++ __u32 nsec;
++ __u32 flags;
++};
++#define PPS_TIME_INVALID (1<<0) /* used to specify timeout==NULL */
++
++struct pps_kinfo {
++ __u32 assert_sequence; /* seq. num. of assert event */
++ __u32 clear_sequence; /* seq. num. of clear event */
++ struct pps_ktime assert_tu; /* time of assert event */
++ struct pps_ktime clear_tu; /* time of clear event */
++ int current_mode; /* current mode bits */
++};
++
++struct pps_kparams {
++ int api_version; /* API version # */
++ int mode; /* mode bits */
++ struct pps_ktime assert_off_tu; /* offset compensation for assert */
++ struct pps_ktime clear_off_tu; /* offset compensation for clear */
++};
++
++/*
++ * 3.3 Mode bit definitions
++ */
++
++/* Device/implementation parameters */
++#define PPS_CAPTUREASSERT 0x01 /* capture assert events */
++#define PPS_CAPTURECLEAR 0x02 /* capture clear events */
++#define PPS_CAPTUREBOTH 0x03 /* capture assert and clear events */
++
++#define PPS_OFFSETASSERT 0x10 /* apply compensation for assert ev. */
++#define PPS_OFFSETCLEAR 0x20 /* apply compensation for clear ev. */
++
++#define PPS_CANWAIT 0x100 /* can we wait for an event? */
++#define PPS_CANPOLL 0x200 /* bit reserved for future use */
++
++/* Kernel actions */
++#define PPS_ECHOASSERT 0x40 /* feed back assert event to output */
++#define PPS_ECHOCLEAR 0x80 /* feed back clear event to output */
++
++/* Timestamp formats */
++#define PPS_TSFMT_TSPEC 0x1000 /* select timespec format */
++#define PPS_TSFMT_NTPFP 0x2000 /* select NTP format */
++
++/*
++ * 3.4.4 New functions: disciplining the kernel timebase
++ */
++
++/* Kernel consumers */
++#define PPS_KC_HARDPPS 0 /* hardpps() (or equivalent) */
++#define PPS_KC_HARDPPS_PLL 1 /* hardpps() constrained to
++ use a phase-locked loop */
++#define PPS_KC_HARDPPS_FLL 2 /* hardpps() constrained to
++ use a frequency-locked loop */
++/*
++ * Here begins the implementation-specific part!
++ */
++
++struct pps_fdata {
++ struct pps_kinfo info;
++ struct pps_ktime timeout;
++};
++
++#include <linux/ioctl.h>
++
++#define PPS_CHECK _IO('P', 0)
++#define PPS_GETPARAMS _IOR('P', 1, struct pps_kparams *)
++#define PPS_SETPARAMS _IOW('P', 2, struct pps_kparams *)
++#define PPS_GETCAP _IOR('P', 3, int *)
++#define PPS_FETCH _IOWR('P', 4, struct pps_fdata *)
++
++#ifdef __KERNEL__
++
++#include <linux/cdev.h>
++#include <linux/device.h>
++
++#define PPS_VERSION "5.0.0-rc2"
++#define PPS_MAX_SOURCES 16 /* should be enought... */
++
++/*
++ * Global defines
++ */
++
++/* The specific PPS source info */
++struct pps_source_info {
++ char name[PPS_MAX_NAME_LEN]; /* simbolic name */
++ char path[PPS_MAX_NAME_LEN]; /* path of connected device */
++ int mode; /* PPS's allowed mode */
++
++ void (*echo)(int source, int event, void *data); /* PPS echo function */
++
++ struct module *owner;
++ struct device *dev;
++};
++
++/* The main struct */
++struct pps_device {
++ struct pps_source_info info; /* PSS source info */
++
++ struct pps_kparams params; /* PPS's current params */
++
++ __u32 assert_sequence; /* PPS' assert event seq # */
++ __u32 clear_sequence; /* PPS' clear event seq # */
++ struct pps_ktime assert_tu;
++ struct pps_ktime clear_tu;
++ int current_mode; /* PPS mode at event time */
++
++ int go; /* PPS event is arrived? */
++ wait_queue_head_t queue; /* PPS event queue */
++
++ unsigned int id; /* PPS source unique ID */
++ struct cdev cdev;
++ struct device *dev;
++ int devno;
++ struct fasync_struct *async_queue; /* fasync method */
++ spinlock_t lock;
++
++ atomic_t usage; /* usage count */
++ wait_queue_head_t usage_queue;
++
++ struct class_device class_dev;
++};
++
++/*
++ * Exported functions
++ */
++
++extern int pps_register_source(struct pps_source_info *info,
++ int default_params);
++extern void pps_unregister_source(int source);
++extern int pps_register_cdev(struct pps_device *pps);
++extern void pps_unregister_cdev(struct pps_device *pps);
++extern void pps_event(int source, int event, void *data);
++
++extern int pps_sysfs_create_source_entry(struct pps_device *pps);
++extern void pps_sysfs_remove_source_entry(struct pps_device *pps);
++
++#endif /* __KERNEL__ */
++
++#endif /* _PPS_H_ */
+diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
+index 09d17b0..f9aefad 100644
+--- a/include/linux/serial_core.h
++++ b/include/linux/serial_core.h
+@@ -157,6 +157,7 @@
+ #include <linux/tty.h>
+ #include <linux/mutex.h>
+ #include <linux/sysrq.h>
++#include <linux/pps.h>
+
+ struct uart_port;
+ struct uart_info;
+@@ -236,6 +237,9 @@ struct uart_port {
+ unsigned char regshift; /* reg offset shift */
+ unsigned char iotype; /* io access style */
+ unsigned char unused1;
++#ifdef CONFIG_PPS_CLIENT_UART
++ int pps_source; /* PPS source ID */
++#endif
+
+ #define UPIO_PORT (0)
+ #define UPIO_HUB6 (1)
+@@ -280,7 +284,8 @@ struct uart_port {
+ #define UPF_IOREMAP ((__force upf_t) (1 << 31))
+
+ #define UPF_CHANGE_MASK ((__force upf_t) (0x17fff))
+-#define UPF_USR_MASK ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))
++#define UPF_USR_MASK ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY\
++ |UPF_HARDPPS_CD))
+
+ unsigned int mctrl; /* current modem ctrl settings */
+ unsigned int timeout; /* character-based timeout */
+@@ -312,6 +317,10 @@ struct uart_state {
+ struct uart_info *info;
+ struct uart_port *port;
+
++#ifdef CONFIG_PPS_CLIENT_UART
++ struct pps_source_info pps_info;
++#endif
++
+ struct mutex mutex;
+ };
+
+@@ -476,13 +485,22 @@ uart_handle_dcd_change(struct uart_port *port, unsigned int status)
+ {
+ struct uart_info *info = port->info;
+
+- port->icount.dcd++;
+-
+-#ifdef CONFIG_HARD_PPS
+- if ((port->flags & UPF_HARDPPS_CD) && status)
+- hardpps();
++#ifdef CONFIG_PPS_CLIENT_UART
++ if (port->flags & UPF_HARDPPS_CD) {
++ if (status) {
++ pps_event(port->pps_source, PPS_CAPTUREASSERT, port);
++ dev_dbg(port->dev, "PPS assert at %lu on source #%d\n",
++ jiffies, port->pps_source);
++ } else {
++ pps_event(port->pps_source, PPS_CAPTURECLEAR, port);
++ dev_dbg(port->dev, "PPS clear at %lu on source #%d\n",
++ jiffies, port->pps_source);
++ }
++ }
+ #endif
+
++ port->icount.dcd++;
++
+ if (info->flags & UIF_CHECK_CD) {
+ if (status)
+ wake_up_interruptible(&info->open_wait);
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