added basic keypress scanning functionality to the update function

1 files changed, 22 insertions, 3 deletions

diff --git a/skey.c b/skey.c
index 834a6fe..d9bdef9 100644
--- a/skey.c
+++ b/skey.c
@@ -17,12 +17,31 @@ static __initdata char * rlabels[3] = {"R0", "R1", "R2"};
  * timer period in ms and timer struct
  */
 static struct timer_list update_timer;
-static int update_period = 5000;
+static int update_period = 5;
 /*
  *This function is called every timer-period to actually read the keyboard
  */
 static void skey_update (unsigned long unused) {
 	printk(KERN_INFO "skey: updated keyboard\n");
+	//reads the keyboard
+	int row_index = 0;
+	int column_index = 0;
+	while (column_index < 10) {
+		//sets the column pin high for reading
+		gpio_set_value(column_pins[column_index],1);
+		//reads with all the rows
+		row_index = 0;
+		while (row_index < 3) {
+			if (gpio_get_value(row_pins[row_index])) {
+				printk(KERN_INFO "skey: key pressed at column %d, row %d\n", column_index, row_index);
+			}
+			row_index++;
+		}
+		//sets the row pin low
+		gpio_set_value(column_pins[column_index],0);
+		column_index++;
+	}
+	//updates the timer
 	mod_timer(&update_timer, jiffies + msecs_to_jiffies(update_period));
 }
 /*
@@ -40,7 +59,7 @@ static int  __init skey_init (void) {
 			return -EINVAL;
 		}
 		//requests access of the GPIO
-		if (gpio_request_one(column_pins[i], GPIOF_DIR_IN ,clabels[i])) {
+		if (gpio_request_one(column_pins[i], GPIOF_OUT_INIT_LOW ,clabels[i])) {
 			printk(KERN_ALERT "skey: column_pins[%d], BCM %d request failed\n", i, column_pins[i]);
 			return -EINVAL;
 		}
@@ -55,7 +74,7 @@ static int  __init skey_init (void) {
 			return -EINVAL;
 		}
 		//requests access of the GPIO
-		if (gpio_request_one(row_pins[j], GPIOF_OUT_INIT_LOW ,rlabels[j])) {
+		if (gpio_request_one(row_pins[j], GPIOF_DIR_IN ,rlabels[j])) {
 			printk(KERN_ALERT "skey: row_pins[%d], BCM %d request failed\n", j, row_pins[j]);
 			return -EINVAL;
 		}