schulung_tools: hellodriver: add patches for use with leds

These patches are based heavily on the work by Manu to make the
driver lessons more interesting. Rather than create a new driver,
I took his work and created a series of patches that do
interesting modifications to the hello driver.

These patches can be used together with the "leds" program to
do live blinking demonstrations.

Signed-off-by: John Ogness <john.ogness@linutronix.de>

1 files changed, 124 insertions, 0 deletions

diff --git a/schulung_tools/drivers/modules/hellodriver/patches-leds/0004-hello-add-led-toggling-via-chardev-ioctl.patch b/schulung_tools/drivers/modules/hellodriver/patches-leds/0004-hello-add-led-toggling-via-chardev-ioctl.patch
new file mode 100644
index 0000000..a67bf98
--- /dev/null
+++ b/schulung_tools/drivers/modules/hellodriver/patches-leds/0004-hello-add-led-toggling-via-chardev-ioctl.patch
@@ -0,0 +1,124 @@
+From be59ddb43fbf039ed0bc848ac56b7f72f7a619c8 Mon Sep 17 00:00:00 2001
+From: John Ogness <john.ogness@linutronix.de>
+Date: Fri, 15 Feb 2019 11:07:10 +0106
+Subject: [PATCH 5/7] hello: add led toggling via chardev ioctl
+
+Compile userspace application with:
+
+$ gcc -Wall -Werror hello-led.c -ohello-led
+
+Signed-off-by: John Ogness <john.ogness@linutronix.de>
+---
+ hello-led.c | 38 ++++++++++++++++++++++++++++++++++++++
+ hello.c     | 22 ++++++++++++++++++++++
+ hello.h     |  7 +++++++
+ 3 files changed, 67 insertions(+)
+ create mode 100644 hello-led.c
+ create mode 100644 hello.h
+
+diff --git a/hello-led.c b/hello-led.c
+new file mode 100644
+index 0000000..43230cd
+--- /dev/null
++++ b/hello-led.c
+@@ -0,0 +1,38 @@
++#include <stdio.h>
++#include <string.h>
++#include <errno.h>
++#include <fcntl.h>
++#include <unistd.h>
++#include <sys/ioctl.h>
++#include <sys/types.h>
++#include <sys/stat.h>
++#include "hello.h"
++
++int main(int argc, char *argv[])
++{
++	int fd;
++
++	if (argc != 3) {
++		fprintf(stderr, "usage: %s <device> <led>\n", argv[0]);
++		return 1;
++	}
++
++	fd = open(argv[1], O_RDWR);
++	if (fd < 0) {
++		fprintf(stderr, "open() failed: %s\n", strerror(errno));
++		return 1;
++	}
++
++	if (strcmp(argv[2], "heartbeat") == 0)
++		ioctl(fd, HELLO_IOCTL_TOGGLE_LED, 0);
++	else if (strcmp(argv[2], "net") == 0)
++		ioctl(fd, HELLO_IOCTL_TOGGLE_LED, 1);
++	else if (strcmp(argv[2], "disk") == 0)
++		ioctl(fd, HELLO_IOCTL_TOGGLE_LED, 2);
++	else
++		fprintf(stderr, "unknown led\n");
++
++	close(fd);
++
++	return 0;
++}
+diff --git a/hello.c b/hello.c
+index f664121..c42c75f 100644
+--- a/hello.c
++++ b/hello.c
+@@ -7,6 +7,7 @@
+ #include <linux/device.h>
+ #include <linux/pci.h>
+ #include <linux/cdev.h>
++#include "hello.h"
+ 
+ struct hello_dev {
+ 	struct device *dev;
+@@ -95,12 +96,33 @@ static ssize_t hello_write(struct file *f, const char __user *u, size_t s,
+ 	return s;
+ }
+ 
++static long hello_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
++{
++	struct hello_dev *hello = f->private_data;
++	u32 val;
++
++	dev_info(hello->dev, "%s: cmd=%u arg=%lu\n", __func__, cmd, arg);
++
++	switch (cmd) {
++	case HELLO_IOCTL_TOGGLE_LED:
++		val = arg;
++		if (val >= 0 && val <= 2)
++			toggle_led(hello, val);
++		break;
++	default:
++		return -EINVAL;
++	}
++
++	return 0;
++}
++
+ static const struct file_operations hello_fops = {
+ 	.owner = THIS_MODULE,
+ 	.open = hello_open,
+ 	.release = hello_release,
+ 	.read = hello_read,
+ 	.write = hello_write,
++	.unlocked_ioctl = hello_ioctl,
+ };
+ 
+ static int hello_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+diff --git a/hello.h b/hello.h
+new file mode 100644
+index 0000000..cb172d9
+--- /dev/null
++++ b/hello.h
+@@ -0,0 +1,7 @@
++#ifndef HELLO_H
++#define HELLO_H
++
++#define HELLO_BASE		0x9F
++#define HELLO_IOCTL_TOGGLE_LED	_IOW(HELLO_BASE, 0x00, unsigned int)
++
++#endif /* HELLO_H */
+-- 
+2.11.0
+