From 44a5c2b2d47dde5215171966eeef0acdadcaded3 Mon Sep 17 00:00:00 2001
From: lonkaars <loek@pipeframe.xyz>
Date: Tue, 14 May 2024 19:59:49 +0200
Subject: remove old character driver

---
 driver/fopdrv.c | 70 ---------------------------------------------------------
 driver/fopdrv.h | 11 ---------
 2 files changed, 81 deletions(-)
 delete mode 100644 driver/fopdrv.c
 delete mode 100644 driver/fopdrv.h

diff --git a/driver/fopdrv.c b/driver/fopdrv.c
deleted file mode 100644
index 87aa30e..0000000
--- a/driver/fopdrv.c
+++ /dev/null
@@ -1,70 +0,0 @@
-#include <linux/io.h>
-
-#include "fopdrv.h"
-#include "config.h"
-
-bool printed = false;
-
-// driver/char/mem.c read_null (/dev/null)
-ssize_t fop_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) {
-	if (count < 2) return 0;
-	if (printed) return 0;
-
-	ti_am335x_word_t* gpio1 = ioremap(TI_AM335X_GPIO1_ADDR, GPIO_REG_SIZE);
-	barrier();
-
-	ti_am335x_word_t gpio = ioread32(gpio1 + GPIO_DATAIN); rmb();
-	bool on = (gpio & (1<<PIN)) > 0;
-
-	char output[10];
-	snprintf(output, 10, "%d\n", on);
-
-	if (copy_to_user(buf, output + *ppos, 2))
-		return -EFAULT;
-	*ppos += 2;
-	printed = true;
-	return 2;
-}
-
-ssize_t fop_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) {
-	// only allow single character as input
-	if (count < 1) return count;
-	if (count > 2) return count;
-
-	// copy buffer for reading (see [kernel-labs-chrdev] in ../readme.md)
-	char input_buf[10];
-	if (copy_from_user(input_buf + *ppos, buf, count))
-		return -EFAULT;
-
-	ti_am335x_word_t* gpio1 = ioremap(TI_AM335X_GPIO1_ADDR, GPIO_REG_SIZE);
-	barrier();
-
-	if (input_buf[0] == '0') {
-		printk(DRV_NAME": OUTPUT OFF\n");
-		iowrite32((1<<PIN), gpio1 + GPIO_CLEARDATAOUT); wmb();
-	}
-	if (input_buf[0] == '1') {
-		printk(DRV_NAME": OUTPUT ON\n");
-		iowrite32((1<<PIN), gpio1 + GPIO_SETDATAOUT); wmb();
-	}
-
-	iounmap(gpio1);
-
-	return count;
-}
-
-int fop_open(struct inode * inode, struct file * file) {
-	printed = false;
-	return 0;
-	// 0 seems to be a safe return value as it's used in driver/char/mem.c. The
-	// manual page for open(2) says that the system call returns a nonnegative
-	// integer representing the file descriptor on success, but it does not
-	// appears to be required.
-}
-
-int fop_release(struct inode * inode, struct file * file) {
-	return 0;
-	// same as above, but found in driver/char/lp.c
-}
-
-
diff --git a/driver/fopdrv.h b/driver/fopdrv.h
deleted file mode 100644
index f2ca18c..0000000
--- a/driver/fopdrv.h
+++ /dev/null
@@ -1,11 +0,0 @@
-#pragma once
-
-#include <linux/fs.h>
-#include <linux/types.h>
-
-// declarations copied from linux/fs.h
-ssize_t fop_read(struct file *, char __user *, size_t, loff_t *);
-ssize_t fop_write(struct file *, const char __user *, size_t, loff_t *);
-int fop_open(struct inode *, struct file *);
-int fop_release(struct inode *, struct file *);
-
-- 
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