doc(lab02): add doc for ex08

doc/lab-01_02.typ

@@ -371,6 +371,7 @@ registers[0] = ioremap(CHIP_ID_BASE_ADDR, 0x1000);
 
 Easy exercice, a thread in the kernet is a `struct task_struct*` that can be created with `kthread_run`
 
+#pagebreak()
 //-------------------
 // Exercise 7: Sleeping
 //-------------------
@@ -402,9 +403,6 @@ a problem during the implementation, we cannot kill the code.
     Interrupts
   ],
   [
-
-
-
     Develop a module which allows to detect every push on the button of the nanopi with interrupt. Every interrupts will send a message for debugging.
 
     - Use the service ``` gpio_request(<io_nr>, <label>)```
@@ -416,6 +414,18 @@ a problem during the implementation, we cannot kill the code.
   ]
 )
 
+We made a custom structur for the gpio device that contain all useful information like the name and the id.
+```c
+struct gpio_nanopi {
+    int id;
+    char* name;
+};
+static struct gpio_nanopi switchK1 = {0, "K1: GPIOA.0"};
+static struct gpio_nanopi switchK2 = {2, "K2: GPIOA.2"};
+static struct gpio_nanopi switchK3 = {3, "K3: GPIOA.3"};
+```
+
+
 //-------------------------------------
 // Glossary
 //

src/01-skeleton/s02e08-interrupt.c

@@ -6,17 +6,14 @@
 #include <linux/gpio.h>
 #include "linux/printk.h"
 
-#define SWITCH_K1 0
-#define SWITCH_K2 2
-#define SWITCH_K3 3
-
 struct gpio_nanopi {
-    int pin;
+    int id;
     char* name;
 };
+
 static struct gpio_nanopi switchK1 = {0, "K1: GPIOA.0"};
-static struct gpio_nanopi switchK2 = {0, "K2: GPIOA.2"};
+static struct gpio_nanopi switchK2 = {2, "K2: GPIOA.2"};
-static struct gpio_nanopi switchK3 = {0, "K3: GPIOA.3"};
+static struct gpio_nanopi switchK3 = {3, "K3: GPIOA.3"};
 
 irqreturn_t isrGPIO(int irq, void* gpio_struct) {
     struct gpio_nanopi *gpio = (struct gpio_nanopi *)gpio_struct;
@@ -31,9 +28,9 @@ void interrupt_init(void) {
     int status = 0;
 
     // Switch k1
-    if (gpio_request(SWITCH_K1, switchK1.name) == 0) {
+    if (gpio_request(switchK1.id, switchK1.name) == 0) {
         status = request_irq(
-            gpio_to_irq(SWITCH_K1),
+            gpio_to_irq(switchK1.id),
             isrGPIO,
             IRQF_TRIGGER_FALLING | IRQF_SHARED,
             switchK1.name,
@@ -42,9 +39,9 @@ void interrupt_init(void) {
     }
 
     // Switch k2
-    if (gpio_request(SWITCH_K2, switchK2.name) == 0) {
+    if (gpio_request(switchK2.id, switchK2.name) == 0) {
         status = request_irq(
-            gpio_to_irq(SWITCH_K2),
+            gpio_to_irq(switchK2.id),
             isrGPIO,
             IRQF_TRIGGER_FALLING | IRQF_SHARED,
             switchK2.name,
@@ -53,9 +50,9 @@ void interrupt_init(void) {
     }
 
     // Switch k3
-    if (gpio_request(SWITCH_K3, switchK3.name) == 0) {
+    if (gpio_request(switchK3.id, switchK3.name) == 0) {
         status = request_irq(
-            gpio_to_irq(SWITCH_K3),
+            gpio_to_irq(switchK3.id),
             isrGPIO,
             IRQF_TRIGGER_FALLING | IRQF_SHARED,
             switchK3.name,
@@ -69,14 +66,14 @@ void interrupt_init(void) {
 void interrupt_exit(void) {
     pr_info("Exiting interrupts\n");
 
-    gpio_free(SWITCH_K1);
+    gpio_free(switchK1.id);
-    free_irq(gpio_to_irq(SWITCH_K1), &switchK1);
+    free_irq(gpio_to_irq(switchK1.id), &switchK1);
 
-    gpio_free(SWITCH_K2);
+    gpio_free(switchK2.id);
-    free_irq(gpio_to_irq(SWITCH_K2), &switchK2);
+    free_irq(gpio_to_irq(switchK2.id), &switchK2);
 
-    gpio_free(SWITCH_K3);
+    gpio_free(switchK3.id);
-    free_irq(gpio_to_irq(SWITCH_K3), &switchK3);
+    free_irq(gpio_to_irq(switchK3.id), &switchK3);
 
     pr_info ("Interrupt exited\n");