v4.19.13 snapshot.
diff --git a/drivers/input/touchscreen/ad7879-i2c.c b/drivers/input/touchscreen/ad7879-i2c.c
new file mode 100644
index 0000000..49b902b
--- /dev/null
+++ b/drivers/input/touchscreen/ad7879-i2c.c
@@ -0,0 +1,75 @@
+/*
+ * AD7879-1/AD7889-1 touchscreen (I2C bus)
+ *
+ * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/input.h> /* BUS_I2C */
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/of.h>
+#include <linux/pm.h>
+#include <linux/regmap.h>
+
+#include "ad7879.h"
+
+#define AD7879_DEVID 0x79 /* AD7879-1/AD7889-1 */
+
+static const struct regmap_config ad7879_i2c_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 16,
+ .max_register = 15,
+};
+
+static int ad7879_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct regmap *regmap;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_WORD_DATA)) {
+ dev_err(&client->dev, "SMBUS Word Data not Supported\n");
+ return -EIO;
+ }
+
+ regmap = devm_regmap_init_i2c(client, &ad7879_i2c_regmap_config);
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ return ad7879_probe(&client->dev, regmap, client->irq,
+ BUS_I2C, AD7879_DEVID);
+}
+
+static const struct i2c_device_id ad7879_id[] = {
+ { "ad7879", 0 },
+ { "ad7889", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, ad7879_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id ad7879_i2c_dt_ids[] = {
+ { .compatible = "adi,ad7879-1", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ad7879_i2c_dt_ids);
+#endif
+
+static struct i2c_driver ad7879_i2c_driver = {
+ .driver = {
+ .name = "ad7879",
+ .pm = &ad7879_pm_ops,
+ .of_match_table = of_match_ptr(ad7879_i2c_dt_ids),
+ },
+ .probe = ad7879_i2c_probe,
+ .id_table = ad7879_id,
+};
+
+module_i2c_driver(ad7879_i2c_driver);
+
+MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
+MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver");
+MODULE_LICENSE("GPL");