DSI : Add the backlight control node in /sys/class/backlight/rpi_backlight/brightness

Change-Id: I8d75ec76b81cb1d82e9dab999f704549b25e9ef8
Reviewed-on: https://tp-biosrd-v02/gerrit/83005
Reviewed-by: Jamess Huang(黃以民) <Jamess_Huang@asus.com>
Tested-by: Jamess Huang(黃以民) <Jamess_Huang@asus.com>

Author: ashinlin

drivers/misc/tinker_mcu.c

@@ -22,12 +22,14 @@
 #include <linux/i2c.h>
 #include <linux/module.h>
 #include <linux/workqueue.h>
+#include <linux/backlight.h>
 #include "tinker_mcu.h"
 
 #define BL_DEBUG 0
 static struct tinker_mcu_data *g_mcu_data;
 static int connected = 0;
 static int lcd_bright_level = 0;
+static struct device *rpi_backlight_device;
 
 static int is_hex(char num)
 {
@@ -187,6 +189,7 @@ static ssize_t tinker_mcu_bl_store(struct device *dev, struct device_attribute *
 	return strnlen(buf, count);
 }
 static DEVICE_ATTR(tinker_mcu_bl, S_IRUGO | S_IWUSR, tinker_mcu_bl_show, tinker_mcu_bl_store);
+static DEVICE_ATTR(brightness, S_IRUGO | S_IWUSR, tinker_mcu_bl_show, tinker_mcu_bl_store);
 
 int tinker_mcu_is_connected(void)
 {
@@ -230,6 +233,22 @@ static int tinker_mcu_probe(struct i2c_client *client,
 		return ret;
 	}
 
+	rpi_backlight_device = device_create(backlight_class, NULL, MKDEV(0, 0), NULL,
+				     "rpi_backlight");
+	if (IS_ERR(rpi_backlight_device)) {
+		printk(KERN_WARNING "Unable to create device "
+		       "for rpi_backlight; errno = %ld\n",
+		       PTR_ERR(rpi_backlight_device));
+		rpi_backlight_device = NULL;
+	} else {
+		//init_device
+		ret = device_create_file(rpi_backlight_device, &dev_attr_brightness);
+		if (ret != 0) {
+			dev_err(&client->dev, "Failed to create brightness sysfs files %d\n", ret);
+			return ret;
+		}
+	}
+
 	return 0;
 
 error:

drivers/video/backlight/backlight.c

@@ -124,6 +124,7 @@ static void backlight_generate_event(struct backlight_device *bd,
 	sysfs_notify(&bd->dev.kobj, NULL, "actual_brightness");
 }
 
+#ifndef CONFIG_TINKER_MCU
 static ssize_t bl_power_show(struct device *dev, struct device_attribute *attr,
 		char *buf)
 {
@@ -242,8 +243,10 @@ static ssize_t actual_brightness_show(struct device *dev,
 	return rc;
 }
 static DEVICE_ATTR_RO(actual_brightness);
+#endif
 
-static struct class *backlight_class;
+struct class *backlight_class;
+EXPORT_SYMBOL(backlight_class);
 
 #ifdef CONFIG_PM_SLEEP
 static int backlight_suspend(struct device *dev)
@@ -285,11 +288,13 @@ static void bl_device_release(struct device *dev)
 }
 
 static struct attribute *bl_device_attrs[] = {
+#ifndef CONFIG_TINKER_MCU
 	&dev_attr_bl_power.attr,
 	&dev_attr_brightness.attr,
 	&dev_attr_actual_brightness.attr,
 	&dev_attr_max_brightness.attr,
 	&dev_attr_type.attr,
+#endif
 	NULL,
 };
 ATTRIBUTE_GROUPS(bl_device);
@@ -594,6 +599,7 @@ static int __init backlight_class_init(void)
 
 	backlight_class->dev_groups = bl_device_groups;
 	backlight_class->pm = &backlight_class_dev_pm_ops;
+
 	INIT_LIST_HEAD(&backlight_dev_list);
 	mutex_init(&backlight_dev_list_mutex);
 	BLOCKING_INIT_NOTIFIER_HEAD(&backlight_notifier);

include/linux/backlight.h

@@ -47,6 +47,7 @@ enum backlight_notification {
 
 struct backlight_device;
 struct fb_info;
+extern struct class *backlight_class;
 
 struct backlight_ops {
 	unsigned int options;