[feat] add interrupt_key simple demo

interrupt/interrupt_01/Makefile

@@ -0,0 +1,12 @@
+ARCH ?= arm
+CROSS_COMPILE ?= /home/jzh/work/study/weidongshan/100ask_stm32mp157_pro-sdk/ToolChain/arm-buildroot-linux-gnueabihf_sdk-buildroot/bin/arm-linux-
+KERN_DIR ?= /home/jzh/work/study/weidongshan/100ask_stm32mp157_pro-sdk/Linux-5.4
+
+all:
+	make -C $(KERN_DIR) M=`pwd` ARCH=$(ARCH) CROSS_COMPILE=$(CROSS_COMPILE) modules
+
+clean:
+	make -C $(KERN_DIR) M=`pwd` ARCH=$(ARCH) CROSS_COMPILE=$(CROSS_COMPILE) modules clean
+	rm -rf modules.order
+
+obj-m += interrupt_01.o

interrupt/interrupt_01/interrupt_01.c

@@ -0,0 +1,120 @@
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/gpio/driver.h>
+#include <linux/gpio/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/of_gpio.h>
+#include <linux/of_irq.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/slab.h>
+
+struct gpio_key {
+    int gpio;
+    struct gpio_desc *gpiod;
+    int flag;
+    int irq;
+};
+
+static struct gpio_key *gpio_keys;
+
+static irqreturn_t gpio_key_isr(int irq, void *dev_id)
+{
+    struct gpio_key *key = dev_id;
+    int value = gpiod_get_value(key->gpiod);
+    printk("%s %s line %d: key %d is %d\r\n", __FILE__, __FUNCTION__, __LINE__, key->gpio, value);
+    return IRQ_HANDLED;
+}
+
+static int interrupt_key_probe(struct platform_device *pdev)
+{
+    int err;
+    struct device_node *node = pdev->dev.of_node;
+    int count;
+    int i;
+    enum of_gpio_flags flag;
+    unsigned flags = GPIOF_IN;
+
+    printk("%s %s %d\r\n", __FILE__, __FUNCTION__, __LINE__);
+
+    count = of_gpio_count(node);
+    if (count == 0) {
+        printk("%s %s line %d: no gpio\r\n", __FILE__, __FUNCTION__, __LINE__);
+        return -1;
+    }
+    gpio_keys = kzalloc(sizeof(struct gpio_key) * count, GFP_KERNEL);
+    for (i = 0; i < count; i++) {
+        gpio_keys[i].gpio = of_get_gpio_flags(node, i, &flag);
+        if (gpio_keys[i].gpio < 0) {
+            printk("%s %s line %d: of_get_gpio_flags failed\r\n", __FILE__, __FUNCTION__, __LINE__);
+            return -1;
+        }
+        gpio_keys[i].gpiod = gpio_to_desc(gpio_keys[i].gpio);
+        gpio_keys[i].flag = flag & OF_GPIO_ACTIVE_LOW;
+        if (flag & OF_GPIO_ACTIVE_LOW) {
+            flags |= GPIOF_ACTIVE_LOW;
+        }
+        err = devm_gpio_request_one(&pdev->dev, gpio_keys[i].gpio, flags, NULL);
+        gpio_keys[i].irq = gpio_to_irq(gpio_keys[i].gpio);
+    }
+
+    for (i = 0; i < count; i++) {
+        err = request_irq(gpio_keys[i].irq, gpio_key_isr, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, "gpio_key", &gpio_keys[i]);
+    }
+
+    return 0;
+}
+
+static int interrupt_key_remove(struct platform_device *pdev)
+{
+    struct device_node *node = pdev->dev.of_node;
+    int count;
+    int i;
+
+    count = of_gpio_count(node);
+    for (i = 0; i < count; i++) {
+        free_irq(gpio_keys[i].irq, &gpio_keys[i]);
+    }
+    kfree(gpio_keys);
+
+    printk("%s %s %d\r\n", __FILE__, __FUNCTION__, __LINE__);
+    return 0;
+}
+
+static const struct of_device_id interrupt_key_of_match[] = {
+    { .compatible = "jzh,interrupt-key", },
+    {  },
+};
+
+static struct platform_driver interrupt_key_driver = {
+    .probe = interrupt_key_probe,
+    .remove = interrupt_key_remove,
+    .driver = {
+        .name = "interrupt-key",
+        .of_match_table = of_match_ptr(interrupt_key_of_match),
+    },
+};
+
+static int __init interrupt_key_init(void)
+{
+    printk("%s %s %d\r\n", __FILE__, __FUNCTION__, __LINE__);
+    return platform_driver_register(&interrupt_key_driver);
+}
+
+static void __exit interrupt_key_exit(void)
+{
+    printk("%s %s %d\r\n", __FILE__, __FUNCTION__, __LINE__);
+    platform_driver_unregister(&interrupt_key_driver);
+}
+
+module_init(interrupt_key_init);
+module_exit(interrupt_key_exit);
+MODULE_DESCRIPTION("Interrupt Key Driver");
+MODULE_AUTHOR("jzhgonha@163.com");
+MODULE_LICENSE("GPL");

interrupt/interrupt_01/interrupt_01.dts

@@ -0,0 +1,25 @@
+interrupt_keys {
+        compatible = "jzh,interrupt-key";
+        gpios = <&gpiog 3 GPIO_ACTIVE_LOW
+                 &gpiog 2 GPIO_ACTIVE_LOW>;
+};
+
+
+joystick {
+        compatible = "gpio-keys";
+        #size-cells = <0>;
+                status = "disabled";
+        button-0 {
+                        label = "usr_button0";
+                        linux,code = <KEY_A>;
+                interrupt-parent = <&gpiog>;
+                interrupts = <3 IRQ_TYPE_EDGE_RISING>;
+        };
+        button-1 {
+                        label = "usr_button1";
+                        linux,code = <KEY_ENTER>;
+                interrupt-parent = <&gpiog>;
+                interrupts = <2 IRQ_TYPE_EDGE_RISING>;
+        };
+
+};