From cadbe2358ed1191c73b0d754a0c280e9de9b7359 Mon Sep 17 00:00:00 2001
From: dianlujitao <dianlujitao@lineageos.org>
Date: Wed, 19 Feb 2020 16:48:25 +0800
Subject: input: touchscreen: Add an interface to expose TP features to
 userspace

 * Needs to implement and register ops from TP driver
 * Access them via /sys/touchpanel/*
 * Export capacitive keys status

Change-Id: I2baa61c6055ca6f6207ac0d6f627fe03048ccfb6
---
 drivers/input/touchscreen/Kconfig     |  9 +++++++++
 drivers/input/touchscreen/Makefile    |  1 +
 drivers/input/touchscreen/tp_common.c | 29 +++++++++++++++++++++++++++++
 include/linux/input/tp_common.h       | 15 +++++++++++++++
 4 files changed, 54 insertions(+)
 create mode 100644 drivers/input/touchscreen/tp_common.c
 create mode 100644 include/linux/input/tp_common.h

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 4164678c225d..9a52f260acb4 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -1273,6 +1273,15 @@ config TOUCHSCREEN_ST
 
 	  If unsure, say N.
 
+config TOUCHSCREEN_COMMON
+	bool "Common touchscreen interface to interact with userspace"
+	default y
+	help
+	  Say Y here if you want to control touchpanel features via
+	  /sys/touchpanel.
+
+	  If unsure, say N.
+
 config TOUCHSCREEN_FOCAL_FT8719
 	bool "Focaltech Touchscreen"
 	depends on I2C
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 5102c5ca1063..875020e301db 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -104,6 +104,7 @@ obj-$(CONFIG_TOUCHSCREEN_ZFORCE)	+= zforce_ts.o
 obj-$(CONFIG_TOUCHSCREEN_COLIBRI_VF50)	+= colibri-vf50-ts.o
 obj-$(CONFIG_TOUCHSCREEN_ROHM_BU21023)	+= rohm_bu21023.o
 obj-$(CONFIG_TOUCHSCREEN_ST)		+= st/
+obj-$(CONFIG_TOUCHSCREEN_COMMON)	+= tp_common.o
 
 # HMI_L6653_A01
 obj-$(CONFIG_TOUCHSCREEN_SYNAPTICS_DSX_E7S)	+= synaptics_dsx_e7s/
diff --git a/drivers/input/touchscreen/tp_common.c b/drivers/input/touchscreen/tp_common.c
new file mode 100644
index 000000000000..194a03e06aa8
--- /dev/null
+++ b/drivers/input/touchscreen/tp_common.c
@@ -0,0 +1,29 @@
+#include <linux/input/tp_common.h>
+
+bool capacitive_keys_enabled;
+struct kobject *touchpanel_kobj;
+
+#define TS_ENABLE_FOPS(type)                                                   \
+	int tp_common_set_##type##_ops(struct tp_common_ops *ops)              \
+	{                                                                      \
+		static struct kobj_attribute kattr =                           \
+			__ATTR(type, (S_IWUSR | S_IRUGO), NULL, NULL);         \
+		kattr.show = ops->show;                                        \
+		kattr.store = ops->store;                                      \
+		return sysfs_create_file(touchpanel_kobj, &kattr.attr);        \
+	}
+
+TS_ENABLE_FOPS(capacitive_keys)
+TS_ENABLE_FOPS(double_tap)
+TS_ENABLE_FOPS(reversed_keys)
+
+static int __init tp_common_init(void)
+{
+	touchpanel_kobj = kobject_create_and_add("touchpanel", NULL);
+	if (!touchpanel_kobj)
+		return -ENOMEM;
+
+	return 0;
+}
+
+core_initcall(tp_common_init);
diff --git a/include/linux/input/tp_common.h b/include/linux/input/tp_common.h
new file mode 100644
index 000000000000..4b038a579fe3
--- /dev/null
+++ b/include/linux/input/tp_common.h
@@ -0,0 +1,15 @@
+#include <linux/kobject.h>
+
+extern bool capacitive_keys_enabled;
+extern struct kobject *touchpanel_kobj;
+
+struct tp_common_ops {
+	ssize_t (*show)(struct kobject *kobj, struct kobj_attribute *attr,
+			char *buf);
+	ssize_t (*store)(struct kobject *kobj, struct kobj_attribute *attr,
+			 const char *buf, size_t count);
+};
+
+int tp_common_set_capacitive_keys_ops(struct tp_common_ops *ops);
+int tp_common_set_double_tap_ops(struct tp_common_ops *ops);
+int tp_common_set_reversed_keys_ops(struct tp_common_ops *ops);
-- 
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