[PATCH v2 2/2] selftests/thermel/intel: conform the test to TAP output

[Muhammad Usama Anjum <usama.anjum@xxxxxxxxxxxxx>]

Conform the layout, informational and status messages to TAP. No
functional change is intended other than the layout of output messages.

The test has infinite loop to read the value of status_str. Break the
loop after getting the value once and finish the test.

Signed-off-by: Muhammad Usama Anjum <usama.anjum@xxxxxxxxxxxxx>
---
Changes since v1:
- Use ksft_exit_fail_perror if read() returns error
- Break the infinite loop after printing status_str
---
 .../intel/power_floor/power_floor_test.c      | 70 ++++++++-----------
 1 file changed, 30 insertions(+), 40 deletions(-)

diff --git a/tools/testing/selftests/thermal/intel/power_floor/power_floor_test.c b/tools/testing/selftests/thermal/intel/power_floor/power_floor_test.c
index 0326b39a11b91..c06b275acd36b 100644
--- a/tools/testing/selftests/thermal/intel/power_floor/power_floor_test.c
+++ b/tools/testing/selftests/thermal/intel/power_floor/power_floor_test.c
@@ -9,6 +9,7 @@
 #include <fcntl.h>
 #include <poll.h>
 #include <signal.h>
+#include "../../../kselftest.h"
 
 #define POWER_FLOOR_ENABLE_ATTRIBUTE "/sys/bus/pci/devices/0000:00:04.0/power_limits/power_floor_enable"
 #define POWER_FLOOR_STATUS_ATTRIBUTE  "/sys/bus/pci/devices/0000:00:04.0/power_limits/power_floor_status"
@@ -20,17 +21,13 @@ void power_floor_exit(int signum)
 	/* Disable feature via sysfs knob */
 
 	fd = open(POWER_FLOOR_ENABLE_ATTRIBUTE, O_RDWR);
-	if (fd < 0) {
-		perror("Unable to open power floor enable file\n");
-		exit(1);
-	}
+	if (fd < 0)
+		ksft_exit_fail_perror("Unable to open power floor enable file");
 
-	if (write(fd, "0\n", 2) < 0) {
-		perror("Can' disable power floor notifications\n");
-		exit(1);
-	}
+	if (write(fd, "0\n", 2) < 0)
+		ksft_exit_fail_perror("Can' disable power floor notifications");
 
-	printf("Disabled power floor notifications\n");
+	ksft_print_msg("Disabled power floor notifications\n");
 
 	close(fd);
 }
@@ -41,6 +38,9 @@ int main(int argc, char **argv)
 	char status_str[3];
 	int fd, ret;
 
+	ksft_print_header();
+	ksft_set_plan(1);
+
 	if (signal(SIGINT, power_floor_exit) == SIG_IGN)
 		signal(SIGINT, SIG_IGN);
 	if (signal(SIGHUP, power_floor_exit) == SIG_IGN)
@@ -50,59 +50,49 @@ int main(int argc, char **argv)
 
 	/* Enable feature via sysfs knob */
 	fd = open(POWER_FLOOR_ENABLE_ATTRIBUTE, O_RDWR);
-	if (fd < 0) {
-		perror("Unable to open power floor enable file\n");
-		exit(1);
-	}
+	if (fd < 0)
+		ksft_exit_fail_perror("Unable to open power floor enable file");
 
-	if (write(fd, "1\n", 2) < 0) {
-		perror("Can' enable power floor notifications\n");
-		exit(1);
-	}
+	if (write(fd, "1\n", 2) < 0)
+		ksft_exit_fail_perror("Can' enable power floor notifications");
 
 	close(fd);
 
-	printf("Enabled power floor notifications\n");
+	ksft_print_msg("Enabled power floor notifications\n");
 
 	while (1) {
 		fd = open(POWER_FLOOR_STATUS_ATTRIBUTE, O_RDONLY);
-		if (fd < 0) {
-			perror("Unable to power floor status file\n");
-			exit(1);
-		}
+		if (fd < 0)
+			ksft_exit_fail_perror("Unable to power floor status file");
 
-		if ((lseek(fd, 0L, SEEK_SET)) < 0) {
-			fprintf(stderr, "Failed to set pointer to beginning\n");
-			exit(1);
-		}
+		if ((lseek(fd, 0L, SEEK_SET)) < 0)
+			ksft_exit_fail_perror("Failed to set pointer to beginning\n");
 
-		if (read(fd, status_str, sizeof(status_str)) < 0) {
-			fprintf(stderr, "Failed to read from:%s\n",
-			POWER_FLOOR_STATUS_ATTRIBUTE);
-			exit(1);
-		}
+		if (read(fd, status_str, sizeof(status_str)) < 0)
+			ksft_exit_fail_perror("Failed to read from: power_floor_status");
 
 		ufd.fd = fd;
 		ufd.events = POLLPRI;
 
 		ret = poll(&ufd, 1, -1);
 		if (ret < 0) {
-			perror("poll error");
-			exit(1);
+			ksft_exit_fail_msg("Poll error\n");
 		} else if (ret == 0) {
-			printf("Poll Timeout\n");
+			ksft_print_msg("Poll Timeout\n");
 		} else {
-			if ((lseek(fd, 0L, SEEK_SET)) < 0) {
-				fprintf(stderr, "Failed to set pointer to beginning\n");
-				exit(1);
-			}
+			if ((lseek(fd, 0L, SEEK_SET)) < 0)
+				ksft_exit_fail_msg("Failed to set pointer to beginning\n");
 
 			if (read(fd, status_str, sizeof(status_str)) < 0)
-				exit(0);
+				ksft_exit_fail_perror("Failed to read");
 
-			printf("power floor status: %s\n", status_str);
+			ksft_print_msg("power floor status: %s\n", status_str);
+			break;
 		}
 
 		close(fd);
 	}
+
+	ksft_test_result_pass("Successfully read\n");
+	ksft_finished();
 }
-- 
2.39.2