From 22a2065b9a3fa6ad458e3100b66c4acaa05f2466 Mon Sep 17 00:00:00 2001
From: Dominik Sliwa <dominik.sliwa@toradex.com>
Date: Thu, 22 Mar 2018 13:08:22 +0100
Subject: input: atmel_mxt_ts: support reset gpio line

Signed-off-by: Dominik Sliwa <dominik.sliwa@toradex.com>
Acked-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
---
 drivers/input/touchscreen/atmel_mxt_ts.c   | 23 +++++++++++++++++++++++
 include/linux/platform_data/atmel_mxt_ts.h |  1 +
 2 files changed, 24 insertions(+)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index c50620255888..5d00742cf5c8 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -27,6 +27,7 @@
 #include <linux/input/mt.h>
 #include <linux/interrupt.h>
 #include <linux/of.h>
+#include <linux/of_gpio.h>
 #include <linux/slab.h>
 #include <asm/unaligned.h>
 #include <media/v4l2-device.h>
@@ -2941,6 +2942,8 @@ static const struct mxt_platform_data *mxt_parse_dt(struct i2c_client *client)
 	if (!pdata)
 		return ERR_PTR(-ENOMEM);
 
+	pdata->gpio_reset = of_get_named_gpio(np, "reset-gpio", 0);
+
 	if (of_find_property(np, "linux,gpio-keymap", &proplen)) {
 		pdata->t19_num_keys = proplen / sizeof(u32);
 
@@ -3150,6 +3153,21 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
 		goto err_free_mem;
 	}
 
+	if (pdata->gpio_reset >= 0) {
+		error = gpio_request(pdata->gpio_reset, "atmel-mxt-ts-reset");
+		if (error < 0 ) {
+			dev_err(&client->dev, "Failure %d requesting reset "
+					"gpio\n", error);
+			goto err_free_mem;
+		}
+		error = gpio_direction_output(pdata->gpio_reset, 1);
+		if (error < 0 ) {
+			dev_err(&client->dev, "Failure %d setting reset gpio"
+					"direction\n", error);
+			goto err_free_gpio;
+		}
+	}
+
 	disable_irq(client->irq);
 
 	error = mxt_initialize(data);
@@ -3170,6 +3188,9 @@ err_free_object:
 	mxt_free_object_table(data);
 err_free_irq:
 	free_irq(client->irq, data);
+err_free_gpio:
+	if (pdata->gpio_reset >= 0)
+		gpio_free(pdata->gpio_reset);
 err_free_mem:
 	kfree(data);
 	return error;
@@ -3181,6 +3202,8 @@ static int mxt_remove(struct i2c_client *client)
 
 	sysfs_remove_group(&client->dev.kobj, &mxt_attr_group);
 	free_irq(data->irq, data);
+	if (data->pdata->gpio_reset >= 0)
+		gpio_free(data->pdata->gpio_reset);
 	mxt_free_input_device(data);
 	mxt_free_object_table(data);
 	kfree(data);
diff --git a/include/linux/platform_data/atmel_mxt_ts.h b/include/linux/platform_data/atmel_mxt_ts.h
index 695035a8d7fb..c59fc18118aa 100644
--- a/include/linux/platform_data/atmel_mxt_ts.h
+++ b/include/linux/platform_data/atmel_mxt_ts.h
@@ -26,6 +26,7 @@ struct mxt_platform_data {
 	u8 t19_num_keys;
 	const unsigned int *t19_keymap;
 	enum mxt_suspend_mode suspend_mode;
+	int gpio_reset;
 };
 
 #endif /* __LINUX_PLATFORM_DATA_ATMEL_MXT_TS_H */
-- 
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