odroid-sysfs: add odroid-sysfs including boot mode detection

Change-Id: I77954dde91d2f85bc57d00173b79a1922cbaf2bf

arch/arm64/boot/dts/rockchip/rk3399-odroidn1.dtsi

@@ -181,6 +181,11 @@
 		rockchip,pwm_id= <2>;
 		rockchip,pwm_voltage = <1000000>;
 	};
+
+	odroid_sysfs: odroid-sysfs {
+		status = "okay";
+		compatible = "odroid-sysfs";
+	};
 };
 
 &cpu_l0 {

arch/arm64/configs/odroidn1_defconfig

@@ -4320,6 +4320,11 @@ CONFIG_RK_NAND=y
 #
 CONFIG_RK_HEADSET=y
 
+#
+# Hardkernel features
+#
+CONFIG_ODROIDN1_SYSFS=y
+
 #
 # Firmware Drivers
 #

drivers/Kconfig

@@ -204,4 +204,6 @@ source "drivers/rk_nand/Kconfig"
 
 source "drivers/headset_observe/Kconfig"
 
+source "drivers/hardkernel/Kconfig"
+
 endmenu

drivers/Makefile

@@ -175,3 +175,6 @@ obj-$(CONFIG_NVMEM)		+= nvmem/
 obj-$(CONFIG_FPGA)		+= fpga/
 obj-$(CONFIG_RK_NAND)		+= rk_nand/
 obj-$(CONFIG_RK_HEADSET)	+= headset_observe/
+
+# misc
+obj-$(CONFIG_ODROIDN1_SYSFS)	+= hardkernel/

drivers/hardkernel/Kconfig

@@ -0,0 +1,7 @@
+if ARCH_ROCKCHIP
+config ODROIDN1_SYSFS
+	bool "Hardkernel ODROID-N1 sysfs Support"
+	default y
+	help
+	   Hardkernel sysfs support based on RK3399
+endif

drivers/hardkernel/Makefile

@@ -0,0 +1 @@
+obj-$(CONFIG_ODROIDN1_SYSFS) += odroid-sysfs.o

drivers/hardkernel/odroid-sysfs.c

@@ -0,0 +1,177 @@
+/*
+ * ODROID sysfs support for extra feature enhancement
+ *
+ * Copyright (C) 2014, Hardkernel Co,.Ltd
+ *   Author: Charles Park <charles.park@hardkernel.com>
+ *   Author: Dongjin Kim <tobetter@gmail.com>
+ *
+ * This driver has been modified to support ODROID-N1.
+ *   Modified by Joy Cho <joycho78@gmail.com>
+ *
+ * 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.
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/irq.h>
+#include <linux/sysfs.h>
+#include <linux/io.h>
+#include <asm/setup.h>
+
+MODULE_AUTHOR("Hardkernel Co,.Ltd");
+MODULE_DESCRIPTION("SYSFS driver for ODROID hardware");
+MODULE_LICENSE("GPL");
+
+static int boot_mode;
+
+/*
+ * Discover the boot device within MicroSD or eMMC
+ * and return 1 for eMMC, otherwise 0.
+ */
+enum {
+	BOOT_DEVICE_RESERVED = 0,
+	BOOT_DEVICE_SD = 1,
+	BOOT_DEVICE_EMMC = 2,
+	BOOT_DEVICE_NAND = 3,
+	BOOT_DEVICE_NVME = 4,
+	BOOT_DEVICE_USB = 5,
+	BOOT_DEVICE_SPI = 6,
+	BOOT_DEVICE_MAX,
+};
+
+/*
+ * if boot_mode is emmc, return 1
+ * else return 0
+ */
+int board_boot_from_emmc(void)
+{
+	if (boot_mode == BOOT_DEVICE_EMMC)
+		return 1;
+	else
+		return 0;
+}
+EXPORT_SYMBOL(board_boot_from_emmc);
+
+static ssize_t show_bootdev(struct class *class,
+		struct class_attribute *attr, char *buf)
+{
+	const char *boot_dev_name[BOOT_DEVICE_MAX] = {
+		"unknown", /* reserved boot device treated as 'unknown' */
+		"sd",
+		"emmc",
+		"nand",
+		"nvme",
+		"usb",
+		"spi"
+	};
+
+	return snprintf(buf, PAGE_SIZE, "%s\n",
+			boot_dev_name[boot_mode]);
+}
+
+static int __init setup_boot_mode(char *str)
+{
+	if (strncmp("emmc", str, 4) == 0)
+		boot_mode = BOOT_DEVICE_EMMC;
+	else if (strncmp("sd", str, 2) == 0)
+		boot_mode = BOOT_DEVICE_SD;
+	else
+		boot_mode = BOOT_DEVICE_RESERVED;
+
+	return 1;
+}
+__setup("storagemedia=", setup_boot_mode);
+
+static struct class_attribute odroid_class_attrs[] = {
+	__ATTR(bootdev, 0444, show_bootdev, NULL),
+	__ATTR_NULL,
+};
+
+static struct class odroid_class = {
+	.name = "odroid",
+	.owner = THIS_MODULE,
+	.class_attrs = odroid_class_attrs,
+};
+
+static int odroid_sysfs_probe(struct platform_device *pdev)
+{
+#ifdef CONFIG_USE_OF
+	struct device_node *node;
+
+	if (pdev->dev.of_node)
+		node = pdev->dev.of_node;
+#endif
+	return 0;
+}
+
+static  int odroid_sysfs_remove(struct platform_device *pdev)
+{
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int odroid_sysfs_suspend(struct platform_device *dev, pm_message_t state)
+{
+	pr_info(KERN_INFO "%s\n", __func__);
+
+	return 0;
+}
+
+static int odroid_sysfs_resume(struct platform_device *dev)
+{
+	pr_info(KERN_INFO "%s\n", __func__);
+
+	return  0;
+}
+#endif
+
+static const struct of_device_id odroid_sysfs_dt[] = {
+	{ .compatible = "odroid-sysfs", },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, odroid_sysfs_dt);
+
+static struct platform_driver odroid_sysfs_driver = {
+	.driver = {
+		.name = "odroid-sysfs",
+		.owner = THIS_MODULE,
+		.of_match_table = odroid_sysfs_dt,
+	},
+	.probe = odroid_sysfs_probe,
+	.remove = odroid_sysfs_remove,
+#ifdef CONFIG_PM_SLEEP
+	.suspend = odroid_sysfs_suspend,
+	.resume = odroid_sysfs_resume,
+#endif
+};
+
+static int __init odroid_sysfs_init(void)
+{
+	int error = class_register(&odroid_class);
+	if (0 > error)
+		return error;
+
+	return platform_driver_register(&odroid_sysfs_driver);
+}
+
+static void __exit odroid_sysfs_exit(void)
+{
+	platform_driver_unregister(&odroid_sysfs_driver);
+	class_unregister(&odroid_class);
+}
+
+module_init(odroid_sysfs_init);
+module_exit(odroid_sysfs_exit);