From f726311525474489a409f4cdb1a6a7ae315f2c05 Mon Sep 17 00:00:00 2001
From: C47D <carlos.santiago.diaz@gmail.com>
Date: Thu, 10 Jun 2021 22:49:56 -0500
Subject: [PATCH] Indev: Add support for GT911 touch driver by @dastarling

---
 CMakeLists.txt            |  2 ++
 lvgl_touch/Kconfig        | 49 +++++++++++++++++++++++++++++++++++++++
 lvgl_touch/touch_driver.c |  4 ++++
 lvgl_touch/touch_driver.h |  2 ++
 4 files changed, 57 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5832233..10262c1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -70,6 +70,8 @@ if(CONFIG_LV_TOUCH_CONTROLLER)
         list(APPEND SOURCES "lvgl_touch/FT81x.c")
     elseif(CONFIG_LV_TOUCH_CONTROLLER_RA8875)
         list(APPEND SOURCES "lvgl_touch/ra8875_touch.c")
+    elseif(CONFIG_LV_TOUCH_CONTROLLER_GT911)
+        list(APPEND SOURCES "lvgl_touch/gt911.c")
     endif()
 
     if(CONFIG_LV_TOUCH_DRIVER_PROTOCOL_SPI)
diff --git a/lvgl_touch/Kconfig b/lvgl_touch/Kconfig
index 7f6e995..9942e0a 100644
--- a/lvgl_touch/Kconfig
+++ b/lvgl_touch/Kconfig
@@ -9,6 +9,7 @@ menu "LVGL Touch controller"
         default 4 if LV_TOUCH_CONTROLLER_ADCRAW
         default 5 if LV_TOUCH_CONTROLLER_FT81X
         default 6 if LV_TOUCH_CONTROLLER_RA8875
+        default 7 if LV_TOUCH_CONTROLLER_GT911
 
     choice
 	prompt "Select a touch panel controller model."
@@ -36,6 +37,9 @@ menu "LVGL Touch controller"
         config LV_TOUCH_CONTROLLER_RA8875
             select LV_TOUCH_DRIVER_DISPLAY
             bool "RA8875"
+        config LV_TOUCH_CONTROLLER_GT911
+            select LV_TOUCH_DRIVER_PROTOCOL_I2C
+            bool "GT911"
     endchoice
     
     config LV_TOUCH_DRIVER_PROTOCOL_SPI
@@ -498,5 +502,50 @@ menu "LVGL Touch controller"
             default y
 
     endmenu
+    
+    menu "Touchpanel (GT911) Pin Assignments"
+        depends on LV_TOUCH_CONTROLLER_GT911
+
+        config LV_TOUCH_I2C_SDA
+            int
+            prompt "GPIO for SDA (I2C)"
+            range 0 39 if IDF_TARGET_ESP32
+            range 0 43 if IDF_TARGET_ESP32S2
+            range 0 21 if IDF_TARGET_ESP32C3
+
+            default 2
+            help
+            Configure the I2C touchpanel SDA pin here.
+
+        config LV_TOUCH_I2C_SCL
+            int "GPIO for clock signal SCL (I2C)"
+            range 0 39 if IDF_TARGET_ESP32
+            range 0 43 if IDF_TARGET_ESP32S2
+            range 0 21 if IDF_TARGET_ESP32C3
+            
+            default 3
+            help
+            Configure the I2C touchpanel SCL pin here.
+    endmenu
+
+    menu "Touchpanel Configuration (GT911)"
+        depends on LV_TOUCH_CONTROLLER_GT911
+
+	config LV_GT911_SWAPXY
+	    bool
+	    prompt "Swap X with Y coordinate."
+	    default y
+
+        config LV_GT911_INVERT_X
+            bool
+            prompt "Invert X coordinate value."
+            default n
+
+        config LV_GT911_INVERT_Y
+            bool
+            prompt "Invert Y coordinate value."
+            default y
+
+    endmenu
 
 endmenu
diff --git a/lvgl_touch/touch_driver.c b/lvgl_touch/touch_driver.c
index b0aed88..6a7afb3 100644
--- a/lvgl_touch/touch_driver.c
+++ b/lvgl_touch/touch_driver.c
@@ -21,6 +21,8 @@ void touch_driver_init(void)
     /* nothing to do */
 #elif defined (CONFIG_LV_TOUCH_CONTROLLER_RA8875)
     ra8875_touch_init();
+#elif defined (CONFIG_LV_TOUCH_CONTROLLER_GT911)
+    gt911_init(GT911_I2C_SLAVE_ADDR);
 #endif
 }
 
@@ -40,6 +42,8 @@ bool touch_driver_read(lv_indev_drv_t *drv, lv_indev_data_t *data)
     res = FT81x_read(drv, data);
 #elif defined (CONFIG_LV_TOUCH_CONTROLLER_RA8875)
     res = ra8875_touch_read(drv, data);
+#elif defined (CONFIG_LV_TOUCH_CONTROLLER_GT911)
+    res = gt911_read(drv, data);
 #endif
 
     return res;
diff --git a/lvgl_touch/touch_driver.h b/lvgl_touch/touch_driver.h
index bc92f4f..44378db 100644
--- a/lvgl_touch/touch_driver.h
+++ b/lvgl_touch/touch_driver.h
@@ -32,6 +32,8 @@ extern "C" {
 #include "FT81x.h"
 #elif defined (CONFIG_LV_TOUCH_CONTROLLER_RA8875)
 #include "ra8875_touch.h"
+#elif defined (CONFIG_LV_TOUCH_CONTROLLER_GT911)
+#include "gt911.h"
 #endif
 
 /*********************