增加sysfs接口

hc

2023-08-30 862c27fc9920c83318c784bfdadf43a65df1ec8f

增加sysfs接口

 kernel/arch/arm64/boot/dts/rockchip/NK-R36S0.dtsi
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@@ -93,6 +93,9 @@
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          	compatible = "nk_io_control";	
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 			pinctrl-names = "default";
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         	pinctrl-0 = <&nk_io_gpio>;
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+			
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+			//gpio_op0 = <&gpio1 RK_PD0 GPIO_ACTIVE_HIGH>;
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+			
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 			vcc_5v {
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 				gpio_num = <&gpio1 RK_PA4 GPIO_ACTIVE_HIGH>; //VCC5_IO_EN_GPIO1_A4_3V3
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 				gpio_function = <0>;	
 kernel/drivers/misc/nkio/nk_io_core.c
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@@ -12,15 +12,18 @@
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 #include <asm/uaccess.h>
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 #include <linux/string.h>
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 #include <linux/uaccess.h>
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+#include <linux/device.h>
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 #define GPIO_FUNCTION_OUTPUT 0
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 #define GPIO_FUNCTION_INPUT 1
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 #define GPIO_FUNCTION_RESET 3
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- 
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+#define HIGH "1"
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+#define LOW "0"
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+
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 static int flash_flag = 0;
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 struct ndj_gpio {
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-   int gpio_num;        //gpui num
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+   int gpio_num;        //gpio num
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    int action;            //gpio flag
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    int gpio_event;        //input only
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    int send_mode;        //input only
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@@ -31,12 +34,66 @@
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 struct ndj_gpio_data {
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    struct ndj_gpio ndj_gpio_num[20];
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-   struct input_dev *input;
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    struct timer_list mytimer;
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    int gpio_dts_num;
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+   unsigned int gpio_op0;
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+   unsigned int gpio_op1;
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 };
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- 
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+
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 static struct ndj_gpio_data *gpio_data = NULL;
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+
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+/* creat sysfs gpio api node*/
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+#if 0
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+static ssize_t gpio_op0_show(struct class *class,struct class_attribute *attr, char *buf)
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+{
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+	return sprintf(buf, "%d\n", gpio_get_value(gpio_data->gpio_op0));
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+}
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+
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+static ssize_t gpio_op0_store(struct class *class,struct class_attribute *attr, const char *buf, size_t size)
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+{
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+	if(!strncmp(buf, HIGH, strlen(HIGH))) {       
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+        gpio_set_value(gpio_data->gpio_op0, 1);        
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+
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+    } else if(!strncmp(buf, LOW, strlen(LOW))) {        
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+        gpio_set_value(gpio_data->gpio_op0, 0);        
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+    }
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+        return size;
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+}
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+
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+static ssize_t gpio_op1_show(struct class *class,struct class_attribute *attr, char *buf)
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+{
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+	return sprintf(buf, "%d\n", gpio_get_value(gpio_data->gpio_op1));
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+}
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+
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+static ssize_t gpio_op1_store(struct class *class,struct class_attribute *attr, const char *buf, size_t size)
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+{
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+	if(!strncmp(buf, HIGH, strlen(HIGH))) {       
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+        gpio_set_value(gpio_data->gpio_op1, 1);        
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+
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+    } else if(!strncmp(buf, LOW, strlen(LOW))) {        
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+        gpio_set_value(gpio_data->gpio_op1, 0);        
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+    }
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+        return size;
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+}
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+
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+static CLASS_ATTR_RW(gpio_op0);
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+static CLASS_ATTR_RW(gpio_op1);
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+
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+static struct attribute *ndj_gpio_attrs[] = {
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+	&class_attr_gpio_op0.attr,
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+	&class_attr_gpio_op1.attr,
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+	NULL,
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+};
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+
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+ATTRIBUTE_GROUPS(ndj_gpio);
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+
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+/** Device model classes */
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+struct class ndj_io_class = {
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+	.name        = "io_control", //sysfs directory
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+	.class_groups = ndj_gpio_groups,
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+}; 
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+ 
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+#endif
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 static int event_flag = 0;
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 static int open_now = 0;
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 static char* file_name = NULL;
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@@ -113,8 +170,6 @@
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    char gpio_name_num[20];
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    int gpio_in_cnt = 0;
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    int cnt =0;
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-   int lvds_index = 0;
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-   int gpio0, gpio1, gpio2, gpio3;
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    int i=0;
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    enum of_gpio_flags flags;
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@@ -130,6 +185,23 @@
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         if (gpio_data->gpio_dts_num == 0){
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             dev_info(&pdev->dev, "no gpio defined\n");
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    }
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+  
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+ #if 0 
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+	/*gpio_op0*/
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+	ret = of_get_named_gpio_flags(np, "gpio_op0", 0, &gpio_flags);
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+    if (ret < 0) {
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+        printk("%s() Can not read property gpio_op0\n", __func__);
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+        return -ENODEV;
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+    }
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+	gpio_data->gpio_op0 = ret;
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+	ret = gpio_request(gpio_data->gpio_op0, "gpio_op0");
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+    if(ret < 0){
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+        printk("%s() gpio_op0 request ERROR\n", __func__);
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+        return -ENODEV;
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+    }
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+	
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+	gpio_direction_output(gpio_data->gpio_op0,!gpio_flags);
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+#endif
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    /* create node */
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    root_entry_gpio = proc_mkdir("ndj_gpio", NULL);
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@@ -161,9 +233,9 @@
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                    gpio_direction_input(gpio_data->ndj_gpio_num[gpio_cnt].gpio_num);
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                    //gpio_direction_output(gpio_data->ndj_gpio_num[gpio_cnt].gpio_num,!gpio_data->ndj_gpio_num[gpio_cnt].action);
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-                   event_flag = gpio_flags;
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-                   of_property_read_u32(child_np, "send_mode", &(gpio_data->ndj_gpio_num[gpio_cnt].send_mode));
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-                   of_property_read_u32(child_np, "gpio_event", &(gpio_data->ndj_gpio_num[gpio_cnt].gpio_event));
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+                   //event_flag = gpio_flags;
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+                   //of_property_read_u32(child_np, "send_mode", &(gpio_data->ndj_gpio_num[gpio_cnt].send_mode));
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+                   //of_property_read_u32(child_np, "gpio_event", &(gpio_data->ndj_gpio_num[gpio_cnt].gpio_event));
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                    gpio_in_cnt++;
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                }
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                break;
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@@ -200,7 +272,14 @@
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        gpio_cnt++;
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    }
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-   platform_set_drvdata(pdev, gpio_data);    
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+   platform_set_drvdata(pdev, gpio_data);  
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+
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+#if 0
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+	ret= class_register(&ndj_io_class);
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+	if(ret < 0) {
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+		return -EINVAL; 
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+	}
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+#endif
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    return 0;
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 }
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..
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@@ -223,6 +302,7 @@
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 static int ndj_gpio_remove(struct platform_device *pdev)
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 {
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+//	class_unregister(&ndj_io_class);
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     return 0;
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 }
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