Documentation/timers/: split txt and source files

Documentation/timers/hpet.txt:
Expose example and tool source files in the Documentation/timers/ directory in
their own files instead of being buried (almost hidden) in readme/txt files.
This should help to prevent bitrot.

This will make them more visible/usable to users who may need
to use them, to developers who may need to test with them, and
to anyone who would fix/update them if they were more visible.

Also, if any of these possibly should not be in the kernel tree at
all, it will be clearer that they are here and we can discuss if
they should be removed.

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 281 insertions, 271 deletions

diff --git a/Documentation/timers/00-INDEX b/Documentation/timers/00-INDEX
index 397dc35e1323..a9248da5cdbc 100644
--- a/Documentation/timers/00-INDEX
+++ b/Documentation/timers/00-INDEX
@@ -4,6 +4,8 @@ highres.txt
 	- High resolution timers and dynamic ticks design notes
 hpet.txt
 	- High Precision Event Timer Driver for Linux
+hpet_example.c
+	- sample hpet timer test program
 hrtimers.txt
 	- subsystem for high-resolution kernel timers
 timer_stats.txt
diff --git a/Documentation/timers/Makefile b/Documentation/timers/Makefile
new file mode 100644
index 000000000000..c85625f4ab25
--- /dev/null
+++ b/Documentation/timers/Makefile
@@ -0,0 +1,8 @@
+# kbuild trick to avoid linker error. Can be omitted if a module is built.
+obj- := dummy.o
+
+# List of programs to build
+hostprogs-y := hpet_example
+
+# Tell kbuild to always build the programs
+always := $(hostprogs-y)
diff --git a/Documentation/timers/hpet.txt b/Documentation/timers/hpet.txt
index 16d25e6b5a00..767392ffd31e 100644
--- a/Documentation/timers/hpet.txt
+++ b/Documentation/timers/hpet.txt
@@ -26,274 +26,5 @@ initialization.  An example of this initialization can be found in
 arch/x86/kernel/hpet.c.
 
 The driver provides a userspace API which resembles the API found in the
-RTC driver framework.  An example user space program is provided below.
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <string.h>
-#include <memory.h>
-#include <malloc.h>
-#include <time.h>
-#include <ctype.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-#include <signal.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <sys/time.h>
-#include <linux/hpet.h>
-
-
-extern void hpet_open_close(int, const char **);
-extern void hpet_info(int, const char **);
-extern void hpet_poll(int, const char **);
-extern void hpet_fasync(int, const char **);
-extern void hpet_read(int, const char **);
-
-#include <sys/poll.h>
-#include <sys/ioctl.h>
-#include <signal.h>
-
-struct hpet_command {
-	char		*command;
-	void		(*func)(int argc, const char ** argv);
-} hpet_command[] = {
-	{
-		"open-close",
-		hpet_open_close
-	},
-	{
-		"info",
-		hpet_info
-	},
-	{
-		"poll",
-		hpet_poll
-	},
-	{
-		"fasync",
-		hpet_fasync
-	},
-};
-
-int
-main(int argc, const char ** argv)
-{
-	int	i;
-
-	argc--;
-	argv++;
-
-	if (!argc) {
-		fprintf(stderr, "-hpet: requires command\n");
-		return -1;
-	}
-
-
-	for (i = 0; i < (sizeof (hpet_command) / sizeof (hpet_command[0])); i++)
-		if (!strcmp(argv[0], hpet_command[i].command)) {
-			argc--;
-			argv++;
-			fprintf(stderr, "-hpet: executing %s\n",
-				hpet_command[i].command);
-			hpet_command[i].func(argc, argv);
-			return 0;
-		}
-
-	fprintf(stderr, "do_hpet: command %s not implemented\n", argv[0]);
-
-	return -1;
-}
-
-void
-hpet_open_close(int argc, const char **argv)
-{
-	int	fd;
-
-	if (argc != 1) {
-		fprintf(stderr, "hpet_open_close: device-name\n");
-		return;
-	}
-
-	fd = open(argv[0], O_RDONLY);
-	if (fd < 0)
-		fprintf(stderr, "hpet_open_close: open failed\n");
-	else
-		close(fd);
-
-	return;
-}
-
-void
-hpet_info(int argc, const char **argv)
-{
-}
-
-void
-hpet_poll(int argc, const char **argv)
-{
-	unsigned long		freq;
-	int			iterations, i, fd;
-	struct pollfd		pfd;
-	struct hpet_info	info;
-	struct timeval		stv, etv;
-	struct timezone		tz;
-	long			usec;
-
-	if (argc != 3) {
-		fprintf(stderr, "hpet_poll: device-name freq iterations\n");
-		return;
-	}
-
-	freq = atoi(argv[1]);
-	iterations = atoi(argv[2]);
-
-	fd = open(argv[0], O_RDONLY);
-
-	if (fd < 0) {
-		fprintf(stderr, "hpet_poll: open of %s failed\n", argv[0]);
-		return;
-	}
-
-	if (ioctl(fd, HPET_IRQFREQ, freq) < 0) {
-		fprintf(stderr, "hpet_poll: HPET_IRQFREQ failed\n");
-		goto out;
-	}
-
-	if (ioctl(fd, HPET_INFO, &info) < 0) {
-		fprintf(stderr, "hpet_poll: failed to get info\n");
-		goto out;
-	}
-
-	fprintf(stderr, "hpet_poll: info.hi_flags 0x%lx\n", info.hi_flags);
-
-	if (info.hi_flags && (ioctl(fd, HPET_EPI, 0) < 0)) {
-		fprintf(stderr, "hpet_poll: HPET_EPI failed\n");
-		goto out;
-	}
-
-	if (ioctl(fd, HPET_IE_ON, 0) < 0) {
-		fprintf(stderr, "hpet_poll, HPET_IE_ON failed\n");
-		goto out;
-	}
-
-	pfd.fd = fd;
-	pfd.events = POLLIN;
-
-	for (i = 0; i < iterations; i++) {
-		pfd.revents = 0;
-		gettimeofday(&stv, &tz);
-		if (poll(&pfd, 1, -1) < 0)
-			fprintf(stderr, "hpet_poll: poll failed\n");
-		else {
-			long 	data;
-
-			gettimeofday(&etv, &tz);
-			usec = stv.tv_sec * 1000000 + stv.tv_usec;
-			usec = (etv.tv_sec * 1000000 + etv.tv_usec) - usec;
-
-			fprintf(stderr,
-				"hpet_poll: expired time = 0x%lx\n", usec);
-
-			fprintf(stderr, "hpet_poll: revents = 0x%x\n",
-				pfd.revents);
-
-			if (read(fd, &data, sizeof(data)) != sizeof(data)) {
-				fprintf(stderr, "hpet_poll: read failed\n");
-			}
-			else
-				fprintf(stderr, "hpet_poll: data 0x%lx\n",
-					data);
-		}
-	}
-
-out:
-	close(fd);
-	return;
-}
-
-static int hpet_sigio_count;
-
-static void
-hpet_sigio(int val)
-{
-	fprintf(stderr, "hpet_sigio: called\n");
-	hpet_sigio_count++;
-}
-
-void
-hpet_fasync(int argc, const char **argv)
-{
-	unsigned long		freq;
-	int			iterations, i, fd, value;
-	sig_t			oldsig;
-	struct hpet_info	info;
-
-	hpet_sigio_count = 0;
-	fd = -1;
-
-	if ((oldsig = signal(SIGIO, hpet_sigio)) == SIG_ERR) {
-		fprintf(stderr, "hpet_fasync: failed to set signal handler\n");
-		return;
-	}
-
-	if (argc != 3) {
-		fprintf(stderr, "hpet_fasync: device-name freq iterations\n");
-		goto out;
-	}
-
-	fd = open(argv[0], O_RDONLY);
-
-	if (fd < 0) {
-		fprintf(stderr, "hpet_fasync: failed to open %s\n", argv[0]);
-		return;
-	}
-
-
-	if ((fcntl(fd, F_SETOWN, getpid()) == 1) ||
-		((value = fcntl(fd, F_GETFL)) == 1) ||
-		(fcntl(fd, F_SETFL, value | O_ASYNC) == 1)) {
-		fprintf(stderr, "hpet_fasync: fcntl failed\n");
-		goto out;
-	}
-
-	freq = atoi(argv[1]);
-	iterations = atoi(argv[2]);
-
-	if (ioctl(fd, HPET_IRQFREQ, freq) < 0) {
-		fprintf(stderr, "hpet_fasync: HPET_IRQFREQ failed\n");
-		goto out;
-	}
-
-	if (ioctl(fd, HPET_INFO, &info) < 0) {
-		fprintf(stderr, "hpet_fasync: failed to get info\n");
-		goto out;
-	}
-
-	fprintf(stderr, "hpet_fasync: info.hi_flags 0x%lx\n", info.hi_flags);
-
-	if (info.hi_flags && (ioctl(fd, HPET_EPI, 0) < 0)) {
-		fprintf(stderr, "hpet_fasync: HPET_EPI failed\n");
-		goto out;
-	}
-
-	if (ioctl(fd, HPET_IE_ON, 0) < 0) {
-		fprintf(stderr, "hpet_fasync, HPET_IE_ON failed\n");
-		goto out;
-	}
-
-	for (i = 0; i < iterations; i++) {
-		(void) pause();
-		fprintf(stderr, "hpet_fasync: count = %d\n", hpet_sigio_count);
-	}
-
-out:
-	signal(SIGIO, oldsig);
-
-	if (fd >= 0)
-		close(fd);
-
-	return;
-}
+RTC driver framework.  An example user space program is provided in
+file:Documentation/timers/hpet_example.c
diff --git a/Documentation/timers/hpet_example.c b/Documentation/timers/hpet_example.c
new file mode 100644
index 000000000000..f9ce2d9fdfd5
--- /dev/null
+++ b/Documentation/timers/hpet_example.c
@@ -0,0 +1,269 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <memory.h>
+#include <malloc.h>
+#include <time.h>
+#include <ctype.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/time.h>
+#include <linux/hpet.h>
+
+
+extern void hpet_open_close(int, const char **);
+extern void hpet_info(int, const char **);
+extern void hpet_poll(int, const char **);
+extern void hpet_fasync(int, const char **);
+extern void hpet_read(int, const char **);
+
+#include <sys/poll.h>
+#include <sys/ioctl.h>
+#include <signal.h>
+
+struct hpet_command {
+	char		*command;
+	void		(*func)(int argc, const char ** argv);
+} hpet_command[] = {
+	{
+		"open-close",
+		hpet_open_close
+	},
+	{
+		"info",
+		hpet_info
+	},
+	{
+		"poll",
+		hpet_poll
+	},
+	{
+		"fasync",
+		hpet_fasync
+	},
+};
+
+int
+main(int argc, const char ** argv)
+{
+	int	i;
+
+	argc--;
+	argv++;
+
+	if (!argc) {
+		fprintf(stderr, "-hpet: requires command\n");
+		return -1;
+	}
+
+
+	for (i = 0; i < (sizeof (hpet_command) / sizeof (hpet_command[0])); i++)
+		if (!strcmp(argv[0], hpet_command[i].command)) {
+			argc--;
+			argv++;
+			fprintf(stderr, "-hpet: executing %s\n",
+				hpet_command[i].command);
+			hpet_command[i].func(argc, argv);
+			return 0;
+		}
+
+	fprintf(stderr, "do_hpet: command %s not implemented\n", argv[0]);
+
+	return -1;
+}
+
+void
+hpet_open_close(int argc, const char **argv)
+{
+	int	fd;
+
+	if (argc != 1) {
+		fprintf(stderr, "hpet_open_close: device-name\n");
+		return;
+	}
+
+	fd = open(argv[0], O_RDONLY);
+	if (fd < 0)
+		fprintf(stderr, "hpet_open_close: open failed\n");
+	else
+		close(fd);
+
+	return;
+}
+
+void
+hpet_info(int argc, const char **argv)
+{
+}
+
+void
+hpet_poll(int argc, const char **argv)
+{
+	unsigned long		freq;
+	int			iterations, i, fd;
+	struct pollfd		pfd;
+	struct hpet_info	info;
+	struct timeval		stv, etv;
+	struct timezone		tz;
+	long			usec;
+
+	if (argc != 3) {
+		fprintf(stderr, "hpet_poll: device-name freq iterations\n");
+		return;
+	}
+
+	freq = atoi(argv[1]);
+	iterations = atoi(argv[2]);
+
+	fd = open(argv[0], O_RDONLY);
+
+	if (fd < 0) {
+		fprintf(stderr, "hpet_poll: open of %s failed\n", argv[0]);
+		return;
+	}
+
+	if (ioctl(fd, HPET_IRQFREQ, freq) < 0) {
+		fprintf(stderr, "hpet_poll: HPET_IRQFREQ failed\n");
+		goto out;
+	}
+
+	if (ioctl(fd, HPET_INFO, &info) < 0) {
+		fprintf(stderr, "hpet_poll: failed to get info\n");
+		goto out;
+	}
+
+	fprintf(stderr, "hpet_poll: info.hi_flags 0x%lx\n", info.hi_flags);
+
+	if (info.hi_flags && (ioctl(fd, HPET_EPI, 0) < 0)) {
+		fprintf(stderr, "hpet_poll: HPET_EPI failed\n");
+		goto out;
+	}
+
+	if (ioctl(fd, HPET_IE_ON, 0) < 0) {
+		fprintf(stderr, "hpet_poll, HPET_IE_ON failed\n");
+		goto out;
+	}
+
+	pfd.fd = fd;
+	pfd.events = POLLIN;
+
+	for (i = 0; i < iterations; i++) {
+		pfd.revents = 0;
+		gettimeofday(&stv, &tz);
+		if (poll(&pfd, 1, -1) < 0)
+			fprintf(stderr, "hpet_poll: poll failed\n");
+		else {
+			long 	data;
+
+			gettimeofday(&etv, &tz);
+			usec = stv.tv_sec * 1000000 + stv.tv_usec;
+			usec = (etv.tv_sec * 1000000 + etv.tv_usec) - usec;
+
+			fprintf(stderr,
+				"hpet_poll: expired time = 0x%lx\n", usec);
+
+			fprintf(stderr, "hpet_poll: revents = 0x%x\n",
+				pfd.revents);
+
+			if (read(fd, &data, sizeof(data)) != sizeof(data)) {
+				fprintf(stderr, "hpet_poll: read failed\n");
+			}
+			else
+				fprintf(stderr, "hpet_poll: data 0x%lx\n",
+					data);
+		}
+	}
+
+out:
+	close(fd);
+	return;
+}
+
+static int hpet_sigio_count;
+
+static void
+hpet_sigio(int val)
+{
+	fprintf(stderr, "hpet_sigio: called\n");
+	hpet_sigio_count++;
+}
+
+void
+hpet_fasync(int argc, const char **argv)
+{
+	unsigned long		freq;
+	int			iterations, i, fd, value;
+	sig_t			oldsig;
+	struct hpet_info	info;
+
+	hpet_sigio_count = 0;
+	fd = -1;
+
+	if ((oldsig = signal(SIGIO, hpet_sigio)) == SIG_ERR) {
+		fprintf(stderr, "hpet_fasync: failed to set signal handler\n");
+		return;
+	}
+
+	if (argc != 3) {
+		fprintf(stderr, "hpet_fasync: device-name freq iterations\n");
+		goto out;
+	}
+
+	fd = open(argv[0], O_RDONLY);
+
+	if (fd < 0) {
+		fprintf(stderr, "hpet_fasync: failed to open %s\n", argv[0]);
+		return;
+	}
+
+
+	if ((fcntl(fd, F_SETOWN, getpid()) == 1) ||
+		((value = fcntl(fd, F_GETFL)) == 1) ||
+		(fcntl(fd, F_SETFL, value | O_ASYNC) == 1)) {
+		fprintf(stderr, "hpet_fasync: fcntl failed\n");
+		goto out;
+	}
+
+	freq = atoi(argv[1]);
+	iterations = atoi(argv[2]);
+
+	if (ioctl(fd, HPET_IRQFREQ, freq) < 0) {
+		fprintf(stderr, "hpet_fasync: HPET_IRQFREQ failed\n");
+		goto out;
+	}
+
+	if (ioctl(fd, HPET_INFO, &info) < 0) {
+		fprintf(stderr, "hpet_fasync: failed to get info\n");
+		goto out;
+	}
+
+	fprintf(stderr, "hpet_fasync: info.hi_flags 0x%lx\n", info.hi_flags);
+
+	if (info.hi_flags && (ioctl(fd, HPET_EPI, 0) < 0)) {
+		fprintf(stderr, "hpet_fasync: HPET_EPI failed\n");
+		goto out;
+	}
+
+	if (ioctl(fd, HPET_IE_ON, 0) < 0) {
+		fprintf(stderr, "hpet_fasync, HPET_IE_ON failed\n");
+		goto out;
+	}
+
+	for (i = 0; i < iterations; i++) {
+		(void) pause();
+		fprintf(stderr, "hpet_fasync: count = %d\n", hpet_sigio_count);
+	}
+
+out:
+	signal(SIGIO, oldsig);
+
+	if (fd >= 0)
+		close(fd);
+
+	return;
+}