From: Jaehoon Chung <jh80.chung@samsung.com>
Date: Tue, 2 Jan 2024 00:31:18 +0000 (+0900)
Subject: misc: add Tizen reboot notifier for passing reboot parameter
X-Git-Tag: accepted/tizen/unified/x/20240220.145856~61
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=04598d754f6adbc90f1852c6e09ddfc3b3834f2c;p=platform%2Fkernel%2Flinux-starfive.git

misc: add Tizen reboot notifier for passing reboot parameter

To provide a reboot command with argument, add tien-inform-reboot.c file.
Its argument will be passed to U-boot, and u-boot will be parsing its argument.
Then it will be entering to a proper mode.

This patch is based on Tizen RPI4 kernel tree.

Change-Id: Icfcec0a26b1cf7a53c5c4352991463df9c67aed6
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
---

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index cadd4a820c03..4499b130c6cb 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -562,6 +562,22 @@ config TPS6594_PFSM
 	  This driver can also be built as a module.  If so, the module
 	  will be called tps6594-pfsm.
 
+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 f2a4d1ff65d4..854e82912182 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -67,3 +67,4 @@ obj-$(CONFIG_TMR_MANAGER)      += xilinx_tmr_manager.o
 obj-$(CONFIG_TMR_INJECT)	+= xilinx_tmr_inject.o
 obj-$(CONFIG_TPS6594_ESM)	+= tps6594-esm.o
 obj-$(CONFIG_TPS6594_PFSM)	+= tps6594-pfsm.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 000000000000..f85386e8b7d2
--- /dev/null
+++ b/drivers/misc/tizen-inform-reboot.c
@@ -0,0 +1,71 @@
+/*
+ * 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;
+	loff_t pos = 0;
+
+	file = filp_open(filename, O_CREAT | O_WRONLY | O_TRUNC, 0644);
+	if (!IS_ERR(file)) {
+		struct super_block *sb = file->f_path.dentry->d_sb;
+
+		if (cmd) {
+			if (!strncmp(cmd, "fota", 4))
+				cmd = "upgr";
+			else if (!strncmp(cmd, "recovery", 8))
+				cmd = "rcvr";
+			else if (!strncmp(cmd, "download", 8))
+				cmd = "dwnl";
+			else
+				cmd = "ndef";
+		} else
+			cmd = "norm";
+
+		kernel_write(file, cmd, strlen(cmd), &pos);
+
+		down_read(&sb->s_umount);
+		sync_filesystem(sb);
+		up_read(&sb->s_umount);
+
+		fput(file);
+	} else {
+		pr_err("Reboot parameter passing is failed.\n"
+				"Inform file path should be described correctly in config.\n");
+	}
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block nb_inform_reboot_block = {
+	.notifier_call = inform_reboot_notifier,
+	.priority = 256,
+};
+
+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);