9 files changed, 0 insertions, 327 deletions
diff --git a/1/Makefile b/1/Makefile
deleted file mode 100644
index d968e31..0000000
--- a/1/Makefile
+++ /dev/null
@@ -1,21 +0,0 @@
-RELEASE := $(shell uname -r)
-KERNEL := /lib/modules/$(RELEASE)/build
-# PWD doesn't have to be defined as it's inherited from the current environment
-# MAKE shouldn't be defined as it's special in GNU make
-
-# the names of these variables are required by the kernel's (imo weird) build
-# system, see [kbuild-obj-var] and [kbuild-module-makefile] in ../readme.md
-obj-m += lork.o
-lork-y += main.o
-lork-y += fopdrv.o
-
-all:
-	$(MAKE) -C $(KERNEL) M=$(PWD) modules
-
-# the generated compile_commands.json needs to be edited to point to the kernel
-# folder as working directory because the include paths are relative
-compile_commands.json:
-	compiledb -o $@.tmp make -Bn
-	jq --arg dir $(KERNEL) '.[].directory = $$dir' $@.tmp > $@
-	$(RM) $@.tmp
-
diff --git a/1/config.h b/1/config.h
deleted file mode 100644
index dbe3a86..0000000
--- a/1/config.h
+++ /dev/null
@@ -1,26 +0,0 @@
-#pragma once
-
-#define DRV_NAME "lork"
-
-#include <linux/types.h>
-
-// values from <https://www.ti.com/lit/ug/spruh73q/spruh73q.pdf>
-
-typedef uint32_t ti_am335x_word_t;
-
-// p. 180: "Control Module"
-#define TI_AM335X_CM_ADDR 0x44E10000
-// p. 182: "GPIO1"
-#define TI_AM335X_GPIO1_ADDR 0x4804C000
-// p. 1459: "conf_gpmc_a3"
-#define TI_AM335X_CM_GPMC_A3_ADDR (TI_AM335X_CM_ADDR + 0x84C)
-
-// p. 4990, variable names copied as-is
-#define GPIO_OE (0x134 / (sizeof(ti_am335x_word_t)))
-#define GPIO_DATAIN (0x138 / (sizeof(ti_am335x_word_t)))
-#define GPIO_CLEARDATAOUT (0x190 / (sizeof(ti_am335x_word_t)))
-#define GPIO_SETDATAOUT (0x194 / (sizeof(ti_am335x_word_t)))
-// total size of GPIO registers from p. 4990 (in bytes)
-#define GPIO_REG_SIZE 0x198
-
-#define PIN 19
diff --git a/1/fopdrv.c b/1/fopdrv.c
deleted file mode 100644
index 18a1d35..0000000
--- a/1/fopdrv.c
+++ /dev/null
@@ -1,76 +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) {
-	printk("%s(<file>, <buf>, %u, <ppos>)\n", __PRETTY_FUNCTION__, count);
-
-	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) {
-	printk("%s(<file>, <buf>, %u, <ppos>)\n", __PRETTY_FUNCTION__, count);
-
-	// 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("TODO: TURN OFF OUTPUT\n");
-		iowrite32((1<<PIN), gpio1 + GPIO_CLEARDATAOUT); wmb();
-	}
-	if (input_buf[0] == '1') {
-		printk("TODO: TURN ON OUTPUT\n");
-		iowrite32((1<<PIN), gpio1 + GPIO_SETDATAOUT); wmb();
-	}
-
-	iounmap(gpio1);
-
-	return count;
-}
-
-int fop_open(struct inode * inode, struct file * file) {
-	printk("%s(<inode>, <file>)\n", __PRETTY_FUNCTION__);
-	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) {
-	printk("%s(<inode>, <file>)\n", __PRETTY_FUNCTION__);
-	return 0;
-	// same as above, but found in driver/char/lp.c
-}
-
-
diff --git a/1/fopdrv.h b/1/fopdrv.h
deleted file mode 100644
index f2ca18c..0000000
--- a/1/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 *);
-
diff --git a/1/main.c b/1/main.c
deleted file mode 100644
index d8ea7fc..0000000
--- a/1/main.c
+++ /dev/null
@@ -1,110 +0,0 @@
-#include <linux/cdev.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/io.h>
-
-#include "fopdrv.h"
-#include "config.h"
-
-int one = 0;
-module_param(one, int, 0400);
-MODULE_PARM_DESC(one, "first parameter, only printed on init");
-
-int not_named_two = 0;
-module_param_named(two, not_named_two, int, 0400);
-MODULE_PARM_DESC(not_named_two, "second parameter, only printed on init");
-
-struct cdev *cdev;
-struct device *dev;
-struct class *class;
-dev_t node;
-struct file_operations fops = {
-	.read = fop_read,
-	.write = fop_write,
-	.open = fop_open,
-	.release = fop_release,
-};
-
-static int mod_init(void) {
-	int err;
-
-	err = alloc_chrdev_region(&node, 0, 1, DRV_NAME);
-	if (err < 0) {
-		printk(KERN_ERR "alloc_chrdev_region error %d\n", err);
-		goto return_err;
-	}
-
-	class = class_create(DRV_NAME);
-	if (IS_ERR_OR_NULL(class)) {
-		err = PTR_ERR(class);
-		printk(KERN_ERR "class_create error %d\n", err);
-		goto free_class;
-	}
-
-	cdev = cdev_alloc();
-	if (!cdev) {
-		err = ENOMEM;
-		goto free_cdev;
-	}
-
-	cdev->ops = &fops;
-	cdev_init(cdev, &fops);
-	err = cdev_add(cdev, node, 1);
-	if (err < 0) {
-		printk(KERN_ERR "cdev_add error %d\n", err);
-		goto free_cdev;
-	}
-
-	dev = device_create(class, NULL, node, NULL, DRV_NAME);
-	if (IS_ERR_OR_NULL(dev)) {
-		err = PTR_ERR(dev);
-		printk(KERN_ERR "device_create error %d\n", err);
-		goto free_device;
-	}
-
-	printk("%s() -> 0 (%d:%d)\n", __PRETTY_FUNCTION__, MAJOR(node), MINOR(node));
-	printk("one = %d, two = %d\n", one, not_named_two);
-
-	// configure gpio mux
-	uint32_t* conf_gpmc_a3 = ioremap(TI_AM335X_CM_GPMC_A3_ADDR, sizeof(ti_am335x_word_t));
-	if (conf_gpmc_a3 == NULL)
-		return -EINVAL;
-	barrier();
-	uint32_t val = ioread32(conf_gpmc_a3); rmb();
-	val &= ~0x7;
-	val |= 0x7;
-	iowrite32(val, conf_gpmc_a3); wmb();
-	iounmap(conf_gpmc_a3);
-
-	// configure output pin
-	ti_am335x_word_t* gpio1 = ioremap(TI_AM335X_GPIO1_ADDR, GPIO_REG_SIZE);
-	barrier();
-	ti_am335x_word_t oe_reg = ioread32(gpio1 + GPIO_OE); rmb();
-	oe_reg &= ~(1<<PIN); // 0=output
-	iowrite32(oe_reg, gpio1 + GPIO_OE); wmb();
-	iounmap(gpio1);
-
-	return 0;
-
-free_device:
-	device_destroy(class, node);
-free_cdev:
-	cdev_del(cdev);
-free_class:
-	class_destroy(class);
-return_err:
-	printk("%s() -> %d\n", __PRETTY_FUNCTION__, err);
-	return err;
-}
-
-static void mod_exit(void) {
-	device_destroy(class, node);
-	cdev_del(cdev);
-	class_destroy(class);
-	printk("%s()\n", __PRETTY_FUNCTION__);
-}
-
-module_init(mod_init);
-module_exit(mod_exit);
-MODULE_LICENSE("Dual MIT/GPL");
-
diff --git a/1/test/.gitignore b/1/test/.gitignore
deleted file mode 100644
index ba2906d..0000000
--- a/1/test/.gitignore
+++ /dev/null
@@ -1 +0,0 @@
-main
diff --git a/1/test/main.c b/1/test/main.c
deleted file mode 100644
index b87e56c..0000000
--- a/1/test/main.c
+++ /dev/null
@@ -1,56 +0,0 @@
-#include <stdio.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <string.h>
-
-int main(int argc, char** argv) {
-	if (geteuid() != 0) {
-		fprintf(stderr, "run me as root!\n");
-		return 1;
-	}
-
-	argc--; // argv[0] is the program name
-	if (argc == 0) {
-		fprintf(stderr, "usage: %s /dev/lork\n", argv[0]);
-		return 1;
-	}
-
-	char* dev = argv[1];
-	const char* input = "test";
-	int fd;
-	ssize_t bytes;
-
-	fd = open(dev, O_RDWR);
-	if (-1 == fd) {
-		fprintf(stderr, "open() failed with code %d\n", errno);
-		return 1;
-	}
-
-	bytes = write(fd, input, strlen(input));
-	if (-1 == bytes) {
-		fprintf(stderr, "write() failed with code %d\n", errno);
-		return 1;
-	}
-	fprintf(stderr, "input \"%s\" to %s (%ld bytes succesful)\n", input, dev, bytes);
-
-	char buf[80];
-	bytes = read(fd, buf, 80);
-	if (-1 == bytes) {
-		fprintf(stderr, "read() failed with code %d\n", errno);
-		return 1;
-	}
-	fprintf(stderr, "output from %s: (%ld bytes)\n", dev, bytes);
-	if (bytes > 0) {
-		if (bytes < 80) buf[bytes] = '\0'; // null terminate string for printf
-		printf("%s\n", buf);
-	}
-
-	if (-1 == close(fd)) {
-		fprintf(stderr, "close() failed with code %d\n", errno);
-		return 1;
-	}
-
-	return 0;
-}
-
diff --git a/1/test/makefile b/1/test/makefile
deleted file mode 100644
index 3491973..0000000
--- a/1/test/makefile
+++ /dev/null
@@ -1,2 +0,0 @@
-main: main.o
-
diff --git a/1/test/test.sh b/1/test/test.sh
deleted file mode 100755
index 7dba005..0000000
--- a/1/test/test.sh
+++ /dev/null
@@ -1,24 +0,0 @@
-#!/bin/sh
-
-if [ $(id -u) -ne 0 ] ; then
-	echo "run me as root!" >&2
-	exit 1
-fi
-
-if [ $# -eq 0 ] ; then
-	echo "usage: $0 /dev/lork" >&2
-	exit 1
-fi
-
-DEV="$1"
-INPUT="test"
-
-echo "input \"$INPUT\" to $DEV" >&2
-echo "$INPUT" > "$DEV"
-echo "(EC $?)" >&2
-
-echo "output from $DEV:" >&2
-cat "$DEV"
-echo "(EC $?)" >&2
-
-exit 0