v4.19.13 snapshot.
diff --git a/include/linux/extcon.h b/include/linux/extcon.h
new file mode 100644
index 0000000..7f033b1
--- /dev/null
+++ b/include/linux/extcon.h
@@ -0,0 +1,321 @@
+/*
+ * External Connector (extcon) framework
+ * - linux/include/linux/extcon.h for extcon consumer device driver.
+ *
+ * Copyright (C) 2015 Samsung Electronics
+ * Author: Chanwoo Choi <cw00.choi@samsung.com>
+ *
+ * Copyright (C) 2012 Samsung Electronics
+ * Author: Donggeun Kim <dg77.kim@samsung.com>
+ * Author: MyungJoo Ham <myungjoo.ham@samsung.com>
+ *
+ * based on switch class driver
+ * Copyright (C) 2008 Google, Inc.
+ * Author: Mike Lockwood <lockwood@android.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+#ifndef __LINUX_EXTCON_H__
+#define __LINUX_EXTCON_H__
+
+#include <linux/device.h>
+
+/*
+ * Define the type of supported external connectors
+ */
+#define EXTCON_TYPE_USB BIT(0) /* USB connector */
+#define EXTCON_TYPE_CHG BIT(1) /* Charger connector */
+#define EXTCON_TYPE_JACK BIT(2) /* Jack connector */
+#define EXTCON_TYPE_DISP BIT(3) /* Display connector */
+#define EXTCON_TYPE_MISC BIT(4) /* Miscellaneous connector */
+
+/*
+ * Define the unique id of supported external connectors
+ */
+#define EXTCON_NONE 0
+
+/* USB external connector */
+#define EXTCON_USB 1
+#define EXTCON_USB_HOST 2
+
+/*
+ * Charging external connector
+ *
+ * When one SDP charger connector was reported, we should also report
+ * the USB connector, which means EXTCON_CHG_USB_SDP should always
+ * appear together with EXTCON_USB. The same as ACA charger connector,
+ * EXTCON_CHG_USB_ACA would normally appear with EXTCON_USB_HOST.
+ *
+ * The EXTCON_CHG_USB_SLOW connector can provide at least 500mA of
+ * current at 5V. The EXTCON_CHG_USB_FAST connector can provide at
+ * least 1A of current at 5V.
+ */
+#define EXTCON_CHG_USB_SDP 5 /* Standard Downstream Port */
+#define EXTCON_CHG_USB_DCP 6 /* Dedicated Charging Port */
+#define EXTCON_CHG_USB_CDP 7 /* Charging Downstream Port */
+#define EXTCON_CHG_USB_ACA 8 /* Accessory Charger Adapter */
+#define EXTCON_CHG_USB_FAST 9
+#define EXTCON_CHG_USB_SLOW 10
+#define EXTCON_CHG_WPT 11 /* Wireless Power Transfer */
+#define EXTCON_CHG_USB_PD 12 /* USB Power Delivery */
+
+/* Jack external connector */
+#define EXTCON_JACK_MICROPHONE 20
+#define EXTCON_JACK_HEADPHONE 21
+#define EXTCON_JACK_LINE_IN 22
+#define EXTCON_JACK_LINE_OUT 23
+#define EXTCON_JACK_VIDEO_IN 24
+#define EXTCON_JACK_VIDEO_OUT 25
+#define EXTCON_JACK_SPDIF_IN 26 /* Sony Philips Digital InterFace */
+#define EXTCON_JACK_SPDIF_OUT 27
+
+/* Display external connector */
+#define EXTCON_DISP_HDMI 40 /* High-Definition Multimedia Interface */
+#define EXTCON_DISP_MHL 41 /* Mobile High-Definition Link */
+#define EXTCON_DISP_DVI 42 /* Digital Visual Interface */
+#define EXTCON_DISP_VGA 43 /* Video Graphics Array */
+#define EXTCON_DISP_DP 44 /* Display Port */
+#define EXTCON_DISP_HMD 45 /* Head-Mounted Display */
+
+/* Miscellaneous external connector */
+#define EXTCON_DOCK 60
+#define EXTCON_JIG 61
+#define EXTCON_MECHANICAL 62
+
+#define EXTCON_NUM 63
+
+/*
+ * Define the properties of supported external connectors.
+ *
+ * When adding the new extcon property, they *must* have
+ * the type/value/default information. Also, you *have to*
+ * modify the EXTCON_PROP_[type]_START/END definitions
+ * which mean the range of the supported properties
+ * for each extcon type.
+ *
+ * The naming style of property
+ * : EXTCON_PROP_[type]_[property name]
+ *
+ * EXTCON_PROP_USB_[property name] : USB property
+ * EXTCON_PROP_CHG_[property name] : Charger property
+ * EXTCON_PROP_JACK_[property name] : Jack property
+ * EXTCON_PROP_DISP_[property name] : Display property
+ */
+
+/*
+ * Properties of EXTCON_TYPE_USB.
+ *
+ * - EXTCON_PROP_USB_VBUS
+ * @type: integer (intval)
+ * @value: 0 (low) or 1 (high)
+ * @default: 0 (low)
+ * - EXTCON_PROP_USB_TYPEC_POLARITY
+ * @type: integer (intval)
+ * @value: 0 (normal) or 1 (flip)
+ * @default: 0 (normal)
+ * - EXTCON_PROP_USB_SS (SuperSpeed)
+ * @type: integer (intval)
+ * @value: 0 (USB/USB2) or 1 (USB3)
+ * @default: 0 (USB/USB2)
+ *
+ */
+#define EXTCON_PROP_USB_VBUS 0
+#define EXTCON_PROP_USB_TYPEC_POLARITY 1
+#define EXTCON_PROP_USB_SS 2
+
+#define EXTCON_PROP_USB_MIN 0
+#define EXTCON_PROP_USB_MAX 2
+#define EXTCON_PROP_USB_CNT (EXTCON_PROP_USB_MAX - EXTCON_PROP_USB_MIN + 1)
+
+/* Properties of EXTCON_TYPE_CHG. */
+#define EXTCON_PROP_CHG_MIN 50
+#define EXTCON_PROP_CHG_MAX 50
+#define EXTCON_PROP_CHG_CNT (EXTCON_PROP_CHG_MAX - EXTCON_PROP_CHG_MIN + 1)
+
+/* Properties of EXTCON_TYPE_JACK. */
+#define EXTCON_PROP_JACK_MIN 100
+#define EXTCON_PROP_JACK_MAX 100
+#define EXTCON_PROP_JACK_CNT (EXTCON_PROP_JACK_MAX - EXTCON_PROP_JACK_MIN + 1)
+
+/*
+ * Properties of EXTCON_TYPE_DISP.
+ *
+ * - EXTCON_PROP_DISP_HPD (Hot Plug Detect)
+ * @type: integer (intval)
+ * @value: 0 (no hpd) or 1 (hpd)
+ * @default: 0 (no hpd)
+ *
+ */
+#define EXTCON_PROP_DISP_HPD 150
+
+/* Properties of EXTCON_TYPE_DISP. */
+#define EXTCON_PROP_DISP_MIN 150
+#define EXTCON_PROP_DISP_MAX 151
+#define EXTCON_PROP_DISP_CNT (EXTCON_PROP_DISP_MAX - EXTCON_PROP_DISP_MIN + 1)
+
+/*
+ * Define the type of property's value.
+ *
+ * Define the property's value as union type. Because each property
+ * would need the different data type to store it.
+ */
+union extcon_property_value {
+ int intval; /* type : integer (intval) */
+};
+
+struct extcon_dev;
+
+#if IS_ENABLED(CONFIG_EXTCON)
+/*
+ * Following APIs get the connected state of each external connector.
+ * The 'id' argument indicates the defined external connector.
+ */
+extern int extcon_get_state(struct extcon_dev *edev, unsigned int id);
+
+/*
+ * Following APIs get the property of each external connector.
+ * The 'id' argument indicates the defined external connector
+ * and the 'prop' indicates the extcon property.
+ *
+ * And extcon_get_property_capability() get the capability of the property
+ * for each external connector. They are used to get the capability of the
+ * property of each external connector based on the id and property.
+ */
+extern int extcon_get_property(struct extcon_dev *edev, unsigned int id,
+ unsigned int prop,
+ union extcon_property_value *prop_val);
+extern int extcon_get_property_capability(struct extcon_dev *edev,
+ unsigned int id, unsigned int prop);
+
+/*
+ * Following APIs register the notifier block in order to detect
+ * the change of both state and property value for each external connector.
+ *
+ * extcon_register_notifier(*edev, id, *nb) : Register a notifier block
+ * for specific external connector of the extcon.
+ * extcon_register_notifier_all(*edev, *nb) : Register a notifier block
+ * for all supported external connectors of the extcon.
+ */
+extern int extcon_register_notifier(struct extcon_dev *edev, unsigned int id,
+ struct notifier_block *nb);
+extern int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id,
+ struct notifier_block *nb);
+extern int devm_extcon_register_notifier(struct device *dev,
+ struct extcon_dev *edev, unsigned int id,
+ struct notifier_block *nb);
+extern void devm_extcon_unregister_notifier(struct device *dev,
+ struct extcon_dev *edev, unsigned int id,
+ struct notifier_block *nb);
+
+extern int extcon_register_notifier_all(struct extcon_dev *edev,
+ struct notifier_block *nb);
+extern int extcon_unregister_notifier_all(struct extcon_dev *edev,
+ struct notifier_block *nb);
+extern int devm_extcon_register_notifier_all(struct device *dev,
+ struct extcon_dev *edev,
+ struct notifier_block *nb);
+extern void devm_extcon_unregister_notifier_all(struct device *dev,
+ struct extcon_dev *edev,
+ struct notifier_block *nb);
+
+/*
+ * Following APIs get the extcon_dev from devicetree or by through extcon name.
+ */
+extern struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name);
+extern struct extcon_dev *extcon_find_edev_by_node(struct device_node *node);
+extern struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev,
+ int index);
+
+/* Following API get the name of extcon device. */
+extern const char *extcon_get_edev_name(struct extcon_dev *edev);
+
+#else /* CONFIG_EXTCON */
+static inline int extcon_get_state(struct extcon_dev *edev, unsigned int id)
+{
+ return 0;
+}
+
+static inline int extcon_get_property(struct extcon_dev *edev, unsigned int id,
+ unsigned int prop,
+ union extcon_property_value *prop_val)
+{
+ return 0;
+}
+
+static inline int extcon_get_property_capability(struct extcon_dev *edev,
+ unsigned int id, unsigned int prop)
+{
+ return 0;
+}
+
+static inline int extcon_register_notifier(struct extcon_dev *edev,
+ unsigned int id, struct notifier_block *nb)
+{
+ return 0;
+}
+
+static inline int extcon_unregister_notifier(struct extcon_dev *edev,
+ unsigned int id, struct notifier_block *nb)
+{
+ return 0;
+}
+
+static inline int devm_extcon_register_notifier(struct device *dev,
+ struct extcon_dev *edev, unsigned int id,
+ struct notifier_block *nb)
+{
+ return -ENOSYS;
+}
+
+static inline void devm_extcon_unregister_notifier(struct device *dev,
+ struct extcon_dev *edev, unsigned int id,
+ struct notifier_block *nb) { }
+
+static inline struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
+{
+ return ERR_PTR(-ENODEV);
+}
+
+static inline struct extcon_dev *extcon_find_edev_by_node(struct device_node *node)
+{
+ return ERR_PTR(-ENODEV);
+}
+
+static inline struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev,
+ int index)
+{
+ return ERR_PTR(-ENODEV);
+}
+#endif /* CONFIG_EXTCON */
+
+/*
+ * Following structure and API are deprecated. EXTCON remains the function
+ * definition to prevent the build break.
+ */
+struct extcon_specific_cable_nb {
+ struct notifier_block *user_nb;
+ int cable_index;
+ struct extcon_dev *edev;
+ unsigned long previous_value;
+};
+
+static inline int extcon_register_interest(struct extcon_specific_cable_nb *obj,
+ const char *extcon_name, const char *cable_name,
+ struct notifier_block *nb)
+{
+ return -EINVAL;
+}
+
+static inline int extcon_unregister_interest(struct extcon_specific_cable_nb *obj)
+{
+ return -EINVAL;
+}
+#endif /* __LINUX_EXTCON_H__ */