DisplayGfA001-legal-info/sources/linux-v4.4.104-bone-rt-r21/linux-020-edt-touch-make-gain-offset-threshold-writeable.patch

--- a/drivers/input/touchscreen/edt-ft5x06.c	2017-09-26 15:27:56.685769326 +0200
+++ b/drivers/input/touchscreen/edt-ft5x06.c	2017-09-25 08:00:57.530768619 +0200
@@ -639,6 +639,111 @@
 	return 0;
 }
 
+
+static int edt_ft5x06_debugfs_threshold_get(void *data, u64 *threshold)
+{
+	struct edt_ft5x06_ts_data *tsdata = data;
+
+	*threshold = (u64)(tsdata->threshold);
+
+	return 0;
+};
+
+static int edt_ft5x06_debugfs_threshold_set(void *data, u64 threshold)
+{
+	struct edt_ft5x06_ts_data *tsdata = data;
+	struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
+	int retval = 0;
+
+/*	if (param > ??????)
+		return -ERANGE;
+*/
+	mutex_lock(&tsdata->mutex);
+	
+	tsdata->threshold = (int)(threshold);
+	edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold,
+				  tsdata->threshold);
+	tsdata->threshold = edt_ft5x06_register_read(tsdata,
+						     reg_addr->reg_threshold);
+
+	mutex_unlock(&tsdata->mutex);
+
+	return retval;
+};
+
+DEFINE_SIMPLE_ATTRIBUTE(debugfs_threshold_fops, edt_ft5x06_debugfs_threshold_get,
+			edt_ft5x06_debugfs_threshold_set, "%llu\n");
+
+
+static int edt_ft5x06_debugfs_gain_get(void *data, u64 *gain)
+{
+	struct edt_ft5x06_ts_data *tsdata = data;
+
+	*gain = (u64)(tsdata->gain);
+
+	return 0;
+};
+
+static int edt_ft5x06_debugfs_gain_set(void *data, u64 gain)
+{
+	struct edt_ft5x06_ts_data *tsdata = data;
+	struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
+	int retval = 0;
+
+/*	if (param > ??????)
+		return -ERANGE;
+*/
+	mutex_lock(&tsdata->mutex);
+	
+	tsdata->gain = (int)(gain);
+	edt_ft5x06_register_write(tsdata, reg_addr->reg_gain,
+				  tsdata->gain);
+	tsdata->gain = edt_ft5x06_register_read(tsdata,
+						     reg_addr->reg_gain);
+
+	mutex_unlock(&tsdata->mutex);
+
+	return retval;
+};
+
+DEFINE_SIMPLE_ATTRIBUTE(debugfs_gain_fops, edt_ft5x06_debugfs_gain_get,
+			edt_ft5x06_debugfs_gain_set, "%llu\n");
+
+
+static int edt_ft5x06_debugfs_offset_get(void *data, u64 *offset)
+{
+	struct edt_ft5x06_ts_data *tsdata = data;
+
+	*offset = (u64)(tsdata->offset);
+
+	return 0;
+};
+
+static int edt_ft5x06_debugfs_offset_set(void *data, u64 offset)
+{
+	struct edt_ft5x06_ts_data *tsdata = data;
+	struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
+	int retval = 0;
+
+/*	if (param > ??????)
+		return -ERANGE;
+*/
+	mutex_lock(&tsdata->mutex);
+	
+	tsdata->offset = (int)(offset);
+	edt_ft5x06_register_write(tsdata, reg_addr->reg_offset,
+				  tsdata->offset);
+	tsdata->offset = edt_ft5x06_register_read(tsdata,
+						     reg_addr->reg_offset);
+
+	mutex_unlock(&tsdata->mutex);
+
+	return retval;
+};
+
+DEFINE_SIMPLE_ATTRIBUTE(debugfs_offset_fops, edt_ft5x06_debugfs_offset_get,
+			edt_ft5x06_debugfs_offset_set, "%llu\n");
+
 static int edt_ft5x06_debugfs_mode_get(void *data, u64 *mode)
 {
 	struct edt_ft5x06_ts_data *tsdata = data;
@@ -766,10 +871,19 @@
 
 	debugfs_create_u16("num_x", S_IRUSR, tsdata->debug_dir, &tsdata->num_x);
 	debugfs_create_u16("num_y", S_IRUSR, tsdata->debug_dir, &tsdata->num_y);
+
+/*
 	debugfs_create_u32("threshold", S_IRUSR, tsdata->debug_dir, &tsdata->threshold);
 	debugfs_create_u32("gain", S_IRUSR, tsdata->debug_dir, &tsdata->gain);
 	debugfs_create_u32("offset", S_IRUSR, tsdata->debug_dir, &tsdata->offset);
+*/
 
+	debugfs_create_file("threshold", S_IRUSR | S_IWUSR,
+			    tsdata->debug_dir, tsdata, &debugfs_threshold_fops);
+	debugfs_create_file("gain", S_IRUSR | S_IWUSR,
+			    tsdata->debug_dir, tsdata, &debugfs_gain_fops);
+	debugfs_create_file("offset", S_IRUSR | S_IWUSR,
+			    tsdata->debug_dir, tsdata, &debugfs_offset_fops);
 
 	debugfs_create_file("mode", S_IRUSR | S_IWUSR,
 			    tsdata->debug_dir, tsdata, &debugfs_mode_fops);