feat(lab02): add code for ex08

src/01-skeleton/s02e08-interrupt.c

@@ -0,0 +1,83 @@
+#include <linux/module.h>	// needed by all modules
+#include <linux/init.h>		// needed for macros
+#include <linux/kernel.h>	// needed for debugging
+
+#include <linux/interrupt.h>
+#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;
+    char* name;
+};
+static struct gpio_nanopi switchK1 = {0, "K1: GPIOA.0"};
+static struct gpio_nanopi switchK2 = {0, "K2: GPIOA.2"};
+static struct gpio_nanopi switchK3 = {0, "K3: GPIOA.3"};
+
+irqreturn_t isrGPIO(int irq, void* gpio_struct) {
+    struct gpio_nanopi *gpio = (struct gpio_nanopi *)gpio_struct;
+    pr_info("GPIO pressed: %s\n", gpio->name);
+    return IRQ_HANDLED;
+}
+
+
+void interrupt_init(void) {
+    pr_info("Initializing interrupts\n");
+
+    int status = 0;
+
+    // Switch k1
+    if (gpio_request(SWITCH_K1, switchK1.name) == 0) {
+        status = request_irq(
+            gpio_to_irq(SWITCH_K1),
+            isrGPIO,
+            IRQF_TRIGGER_FALLING | IRQF_SHARED,
+            switchK1.name,
+            &switchK1
+        );
+    }
+
+    // Switch k2
+    if (gpio_request(SWITCH_K2, switchK2.name) == 0) {
+        status = request_irq(
+            gpio_to_irq(SWITCH_K2),
+            isrGPIO,
+            IRQF_TRIGGER_FALLING | IRQF_SHARED,
+            switchK2.name,
+            &switchK2
+        );
+    }
+
+    // Switch k3
+    if (gpio_request(SWITCH_K3, switchK3.name) == 0) {
+        status = request_irq(
+            gpio_to_irq(SWITCH_K3),
+            isrGPIO,
+            IRQF_TRIGGER_FALLING | IRQF_SHARED,
+            switchK3.name,
+            &switchK3
+        );
+    }
+
+    pr_info("Interrupt initialized\n");
+}
+
+void interrupt_exit(void) {
+    pr_info("Exiting interrupts\n");
+
+    gpio_free(SWITCH_K1);
+    free_irq(gpio_to_irq(SWITCH_K1), &switchK1);
+
+    gpio_free(SWITCH_K2);
+    free_irq(gpio_to_irq(SWITCH_K2), &switchK2);
+
+    gpio_free(SWITCH_K3);
+    free_irq(gpio_to_irq(SWITCH_K3), &switchK3);
+
+    pr_info ("Interrupt exited\n");
+
+}

src/01-skeleton/skeleton.c

@@ -3,69 +3,105 @@
 #include <linux/init.h>		// needed for macros
 #include <linux/kernel.h>	// needed for debugging
 
+#include "linux/printk.h"
 #include "s02e02-parameters.c"
+// #define PARAMETERS
+
 #include "s02e04-dynamic_allocation.c"
+// #define DYNAMIC_ALLOCATION
+
 #include "s02e05-io_memory_mapped.c"
+// #define IO_MEMORY_MAPPED
+
 #include "s02e06-thread.c"
+// #define THREAD
+
 #include "s02e07-sleeping.c"
+// #define SLEEPING
+
+#include "s02e08-interrupt.c"
+#define INTERRUPT
 
 
 static int __init skeleton_init(void) {
     pr_info("Linux module skeleton ex05 loading...\n");
-	pr_info("--------------------\n");
 
     // Lab02 - Exercise 2: Parameters
-    // parameters_print();
+    #ifdef PARAMETERS
-
 	pr_info("--------------------\n");
+    parameters_print();
+    #endif
 
     // Lab02 - Exercise 4: Dynamic memory allocation and linked list
-    // dynAlloc_init();
+    #ifdef DYNAMIC_ALLOCATION
-
     pr_info("--------------------\n");
+    Alloc_init();
+    #endif
 
     // Lab02 - Exercise 5: Memory-mapped I/O
-    // ioMemoryMapped_init();
+    #ifdef IO_MEMORY_MAPPED
-
     pr_info("--------------------\n");
+    ioMemoryMapped_init();
+    #endif
 
     // Lab02 - Exercise 6: Kernel thread
-    // thread_init();
+    #ifdef THREAD
-
     pr_info("--------------------\n");
+    thread_init();
+    #endif
 
     // Lab02 - Exercise 7: Sleeping
+    #ifdef SLEEPING
+    pr_info("--------------------\n");
     sleeping_init();
+    #endif
+
+    // Lab02 - Exercise 8: Interrupt
+    #ifdef INTERRUPT
+    pr_info("--------------------\n");
+    interrupt_init();
+    #endif
 
     pr_info("--------------------\n");
-
     pr_info("Linux module skeleton loaded\n");
 	return 0;
 }
 
 static void __exit skeleton_exit(void) {
 
+    pr_info("Linux module skeleton unloading...\n");
 
     // Lab02 - Exercise 4: Dynamic memory allocation and linked list
-    // dynAlloc_exit();
+    #ifdef DYNAMIC_ALLOCATION
-
     pr_info("--------------------\n");
+    dynAlloc_exit();
+    #endif
 
     // Lab02 - Exercise 5: Memory-mapped I/O
-    // ioMemoryMapped_exit();
+    #ifdef IO_MEMORY_MAPPED
-
     pr_info("--------------------\n");
+    ioMemoryMapped_exit();
+    #endif
 
     // Lab02 - Exercise 6: Kernel thread
-    // thread_exit();
+    #ifdef THREAD
-
     pr_info("--------------------\n");
+    thread_exit();
+    #endif
 
     // Lab02 - Exercise 7: Sleeping
+    #ifdef SLEEPING
+    pr_info("--------------------\n");
     sleeping_exit();
+    #endif
+
+    // Lab02 - Exercise 8: Interrupt
+    #ifdef INTERRUPT
+    pr_info("--------------------\n");
+    interrupt_exit();
+    #endif
 
     pr_info("--------------------\n");
-
     pr_info ("Linux module skeleton unloaded\n");
 }