From 4d26093fd63934a5b3b8441bb9740675faff1d96 Mon Sep 17 00:00:00 2001
From: knolax <1339802534.kk@gmail.com>
Date: Thu, 7 Dec 2017 22:27:00 -0500
Subject: added functions to explicitly set pins as input or output do to
 kernel panics when trying to use gpio_set_value()

---
 skey.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

(limited to 'skey.c')

diff --git a/skey.c b/skey.c
index d9bdef9..2d5b4aa 100644
--- a/skey.c
+++ b/skey.c
@@ -28,7 +28,7 @@ static void skey_update (unsigned long unused) {
 	int column_index = 0;
 	while (column_index < 10) {
 		//sets the column pin high for reading
-		gpio_set_value(column_pins[column_index],1);
+		gpio_set_value(column_pins[column_index], 1);
 		//reads with all the rows
 		row_index = 0;
 		while (row_index < 3) {
@@ -38,7 +38,7 @@ static void skey_update (unsigned long unused) {
 			row_index++;
 		}
 		//sets the row pin low
-		gpio_set_value(column_pins[column_index],0);
+		gpio_set_value(column_pins[column_index], 0);
 		column_index++;
 	}
 	//updates the timer
@@ -63,6 +63,9 @@ static int  __init skey_init (void) {
 			printk(KERN_ALERT "skey: column_pins[%d], BCM %d request failed\n", i, column_pins[i]);
 			return -EINVAL;
 		}
+		if (gpio_direction_output(column_pins[i], 0)) {
+			printk(KERN_ALERT "skey: column_pins[%d], BCM %d, set output failed\n",i, column_pins[i]);
+		}
 		i++;
 	}
 	//ditto for row pins
@@ -78,6 +81,9 @@ static int  __init skey_init (void) {
 			printk(KERN_ALERT "skey: row_pins[%d], BCM %d request failed\n", j, row_pins[j]);
 			return -EINVAL;
 		}
+		if (gpio_direction_input(row_pins[j])) {
+			printk(KERN_ALERT "skey: row_pins[%d], BCM %d, set output failed\n",j, row_pins[j]);
+		}
 		j++;
 	}
 	//sets up timer for keyboard read function
-- 
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