linux-kernel - [DO NOT APPLY PATCH v8 08/15] tools/poeg: Add test app for poeg

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Message-ID: <20251121160842.371922-9-biju.das.jz@bp.renesas.com>
Date: Fri, 21 Nov 2025 16:08:15 +0000
From: Biju <biju.das.au@...il.com>
To: Uwe Kleine-König <ukleinek@...nel.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Linus Walleij <linus.walleij@...aro.org>
Cc: Biju Das <biju.das.jz@...renesas.com>,
	linux-kernel@...r.kernel.org,
	linux-pwm@...r.kernel.org,
	Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
	Biju Das <biju.das.au@...il.com>,
	linux-renesas-soc@...r.kernel.org,
	linux-gpio@...r.kernel.org
Subject: [DO NOT APPLY PATCH v8 08/15] tools/poeg: Add test app for poeg

From: Biju Das <biju.das.jz@...renesas.com>

Add test app for poeg for controlling output disable through
user space.

Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
---
 tools/poeg/Build      |  1 +
 tools/poeg/Makefile   | 53 +++++++++++++++++++++++++++++++++++++++
 tools/poeg/poeg_app.c | 58 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 112 insertions(+)
 create mode 100644 tools/poeg/Build
 create mode 100644 tools/poeg/Makefile
 create mode 100644 tools/poeg/poeg_app.c

diff --git a/tools/poeg/Build b/tools/poeg/Build
new file mode 100644
index 000000000000..f960920a4afb
--- /dev/null
+++ b/tools/poeg/Build
@@ -0,0 +1 @@
+poeg_app-y += poeg_app.o
diff --git a/tools/poeg/Makefile b/tools/poeg/Makefile
new file mode 100644
index 000000000000..669c914d9c98
--- /dev/null
+++ b/tools/poeg/Makefile
@@ -0,0 +1,53 @@
+# SPDX-License-Identifier: GPL-2.0
+include ../scripts/Makefile.include
+
+bindir ?= /usr/bin
+
+ifeq ($(srctree),)
+srctree := $(patsubst %/,%,$(dir $(CURDIR)))
+srctree := $(patsubst %/,%,$(dir $(srctree)))
+endif
+
+# Do not use make's built-in rules
+# (this improves performance and avoids hard-to-debug behaviour);
+MAKEFLAGS += -r
+
+override CFLAGS += -O2 -Wall -g -D_GNU_SOURCE -I$(OUTPUT)include
+
+ALL_TARGETS := poeg_app
+ALL_PROGRAMS := $(patsubst %,$(OUTPUT)%,$(ALL_TARGETS))
+
+all: $(ALL_PROGRAMS)
+
+export srctree OUTPUT CC LD CFLAGS
+include $(srctree)/tools/build/Makefile.include
+
+#
+# We need the following to be outside of kernel tree
+#
+$(OUTPUT)include/linux/poeg.h: ../../include/linux/pinctrl/rzg2l-poeg.h
+	mkdir -p $(OUTPUT)include/linux 2>&1 || true
+	ln -sf $(CURDIR)/../../include/linux/pinctrl/rzg2l-poeg.h $@
+
+prepare: $(OUTPUT)include/linux/poeg.h
+
+POEG_EXAMPLE := $(OUTPUT)poeg_app.o
+$(POEG_EXAMPLE): prepare FORCE
+	$(Q)$(MAKE) $(build)=poeg_app
+$(OUTPUT)poeg_app: $(POEG_EXAMPLE)
+	$(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) $< -o $@
+
+clean:
+	rm -f $(ALL_PROGRAMS)
+	rm -rf $(OUTPUT)include/linux/poeg.h
+	find $(or $(OUTPUT),.) -name '*.o' -delete -o -name '\.*.d' -delete
+
+install: $(ALL_PROGRAMS)
+	install -d -m 755 $(DESTDIR)$(bindir);		\
+	for program in $(ALL_PROGRAMS); do		\
+		install $$program $(DESTDIR)$(bindir);	\
+	done
+
+FORCE:
+
+.PHONY: all install clean FORCE prepare
diff --git a/tools/poeg/poeg_app.c b/tools/poeg/poeg_app.c
new file mode 100644
index 000000000000..4ff8e5c007dc
--- /dev/null
+++ b/tools/poeg/poeg_app.c
@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * POEG - example userspace application
+ * Copyright (C) 2023 Biju Das
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/ioctl.h>
+#include <linux/ioctl.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <poll.h>
+
+#include <linux/poeg.h>
+
+int main(int argc, char *argv[])
+{
+	struct poeg_cmd cmd;
+	unsigned int val;
+	long cmd_val;
+	char *p;
+	int i;
+
+	cmd_val = strtol(argv[1], &p, 10);
+	if (*p != '\0' || errno != 0)
+		return 1; // In main(), returning non-zero means failure
+
+	fd = open("/dev/poeg3", O_RDWR);
+	if (fd < 0)
+		perror("open");
+	else
+		printf("[POEG]open\n");
+
+	cmd.val = cmd_val;
+	cmd.channel = 4;
+	if (cmd.val == RZG2L_POEG_OUTPUT_DISABLE_USR_ENABLE_CMD)
+		printf("[POEG] user control pin output disable enabled\n");
+	else
+		printf("[POEG] user control pin output disable disabled\n");
+
+	ret = write(fd, &cmd, sizeof(cmd));
+	if (ret == -1) {
+		perror("Failed to write cmd data");
+		return 1;
+	}
+
+	if (close(fd) != 0)
+		perror("close");
+	else
+		printf("[POEG]close\n");
+
+	return 0;
+}
-- 
2.43.0