From: Junghoon Kim <jhoon20.kim@samsung.com>
Date: Mon, 21 Aug 2017 02:04:32 +0000 (+0900)
Subject: misc: add Tizen reboot notifier for passing reboot parameter
X-Git-Tag: accepted/tizen/unified/20200709.164653~245
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=990d69bd5b1419ef3b1e84089e4764d207052464;p=platform%2Fkernel%2Flinux-rpi.git

misc: add Tizen reboot notifier for passing reboot parameter

To determine booting mode (e.g, fota or recovery) in u-boot side, reboot
parameter should be passed through inform partition.

Add Tizen reboot notifier for passing reboot parameter.

Change-Id: I5830dcf58ec6905b0bc382599aa9ff1251f817d8
Signed-off-by: Junghoon Kim <jhoon20.kim@samsung.com>
---

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 62c3ec2..1e096ea 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -474,6 +474,22 @@ config PVPANIC
 	  a paravirtualized device provided by QEMU; it lets a virtual machine
 	  (guest) communicate panic events to the host.
 
+config TIZEN_INFORM_REBOOT
+	bool "Tizen reboot parameter passing support"
+	default "n"
+	---help---
+	  This enables support for passing reboot parameter through inform
+	  partition. It is required to determine booting mode (e.g., fota or
+	  normal). After passing reboot parameter, u-boot checks the contents
+	  of inform file and then determines proper booting mode.
+
+config TIZEN_INFORM_PATH
+	depends on TIZEN_INFORM_REBOOT
+	string "Absolute path of inform file for passing reboot parameter"
+	---help---
+	  This option determines the absolute path of inform file for passing
+	  reboot parameter.
+
 source "drivers/misc/c2port/Kconfig"
 source "drivers/misc/eeprom/Kconfig"
 source "drivers/misc/cb710/Kconfig"
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index dbca246..a31617a 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -58,3 +58,4 @@ obj-y				+= cardreader/
 obj-$(CONFIG_PVPANIC)   	+= pvpanic.o
 obj-$(CONFIG_HABANA_AI)		+= habanalabs/
 obj-$(CONFIG_XILINX_SDFEC)	+= xilinx_sdfec.o
+obj-$(CONFIG_TIZEN_INFORM_REBOOT)	+= tizen-inform-reboot.o
diff --git a/drivers/misc/tizen-inform-reboot.c b/drivers/misc/tizen-inform-reboot.c
new file mode 100644
index 0000000..7a1f16f
--- /dev/null
+++ b/drivers/misc/tizen-inform-reboot.c
@@ -0,0 +1,74 @@
+/*
+ * Tizen reboot parameter passing notifier
+ *
+ * Written by: Junghoon Kim <jhoon20.kim@samsung.com>
+ *
+ * Copyright (C) 2017 Samsung Electronics Co., Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/syscalls.h>
+#include <linux/file.h>
+#include <linux/fcntl.h>
+#include <linux/uaccess.h>
+
+static int inform_reboot_notifier(struct notifier_block *nb,
+						unsigned long val, void *buf)
+{
+	char *cmd = buf;
+	char *filename = CONFIG_TIZEN_INFORM_PATH;
+	struct file *file;
+	int fd;
+	loff_t pos = 0;
+	mm_segment_t old_fs = get_fs();
+
+	set_fs(KERNEL_DS);
+
+	fd = sys_open(filename, O_CREAT | O_WRONLY | O_TRUNC, 0644);
+	if (fd >= 0) {
+		file = fget(fd);
+		if (file) {
+			if (cmd) {
+				if (!strncmp(cmd, "fota", 4))
+					cmd = "upgr";
+				else if (!strncmp(cmd, "recovery", 8))
+					cmd = "rcvr";
+				else
+					cmd = "ndef";
+			} else
+				cmd = "norm";
+
+			vfs_write(file, cmd, strlen(cmd), &pos);
+			vfs_fsync(file, 0);
+			fput(file);
+		}
+		sys_close(fd);
+		/* to guarantee all file data and metadata sync */
+		emergency_sync();
+	} else {
+		pr_err("Reboot parameter passing is failed.\n"
+				"Inform file path should be described correctly in config.\n");
+	}
+
+	set_fs(old_fs);
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block nb_inform_reboot_block = {
+	.notifier_call = inform_reboot_notifier
+};
+
+static int __init inform_reboot_init(void)
+{
+	/* to support reboot parameter passing */
+	register_reboot_notifier(&nb_inform_reboot_block);
+	return 0;
+}
+
+subsys_initcall(inform_reboot_init);