From 1763454123f6a4bdd236c9e11a66747e1bc705a2 Mon Sep 17 00:00:00 2001
From: "jonggab.park" <jonggab.park@samsung.com>
Date: Fri, 28 Apr 2017 14:09:54 +0900
Subject: [PATCH] drm/tgm: add sub driver handling interface.

It doesn't have the pp interface for the pp driver.
And this patch is from product kernel.

Change-Id: Iceb891e602fe6e6e246445b7d845927cc39a73c0
Signed-off-by: Jin-young Jeon <jy0.jeon@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
---
 drivers/gpu/drm/tgm/tgm_drv.c | 107 ++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/tgm/tgm_drv.h |  20 +++++++
 2 files changed, 127 insertions(+)

diff --git a/drivers/gpu/drm/tgm/tgm_drv.c b/drivers/gpu/drm/tgm/tgm_drv.c
index 2053b00cb47..bd8570042f5 100644
--- a/drivers/gpu/drm/tgm/tgm_drv.c
+++ b/drivers/gpu/drm/tgm/tgm_drv.c
@@ -30,6 +30,113 @@ struct component_dev {
 	struct device *irq_dev;
 };
 
+static LIST_HEAD(tgm_subdrv_list);
+
+int tgm_subdrv_register(struct tgm_subdrv *subdrv)
+{
+	if (!subdrv)
+		return -EINVAL;
+
+	list_add_tail(&subdrv->list, &tgm_subdrv_list);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(tgm_subdrv_register);
+
+int tgm_subdrv_unregister(struct tgm_subdrv *subdrv)
+{
+	if (!subdrv)
+		return -EINVAL;
+
+	list_del(&subdrv->list);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(tgm_subdrv_unregister);
+
+int tgm_device_subdrv_probe(struct drm_device *dev)
+{
+	struct tgm_subdrv *subdrv, *n;
+	int err;
+
+	if (!dev)
+		return -EINVAL;
+
+	list_for_each_entry_safe(subdrv, n, &tgm_subdrv_list, list) {
+		if (subdrv->probe) {
+			subdrv->drm_dev = dev;
+
+			/*
+			 * this probe callback would be called by sub driver
+			 * after setting of all resources to this sub driver,
+			 * such as clock, irq and register map are done.
+			 */
+			err = subdrv->probe(dev, subdrv->dev);
+			if (err) {
+				DRM_DEBUG("exynos drm subdrv probe failed.\n");
+				list_del(&subdrv->list);
+				continue;
+			}
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(tgm_device_subdrv_probe);
+
+int tgm_device_subdrv_remove(struct drm_device *dev)
+{
+	struct tgm_subdrv *subdrv;
+
+	if (!dev) {
+		WARN(1, "Unexpected drm device unregister!\n");
+		return -EINVAL;
+	}
+
+	list_for_each_entry(subdrv, &tgm_subdrv_list, list) {
+		if (subdrv->remove)
+			subdrv->remove(dev, subdrv->dev);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(tgm_device_subdrv_remove);
+
+int tgm_subdrv_open(struct drm_device *dev, struct drm_file *file)
+{
+	struct tgm_subdrv *subdrv;
+	int ret;
+
+	list_for_each_entry(subdrv, &tgm_subdrv_list, list) {
+		if (subdrv->open) {
+			ret = subdrv->open(dev, subdrv->dev, file);
+			if (ret)
+				goto err;
+		}
+	}
+
+	return 0;
+
+err:
+	list_for_each_entry_reverse(subdrv, &subdrv->list, list) {
+		if (subdrv->close)
+			subdrv->close(dev, subdrv->dev, file);
+	}
+	return ret;
+}
+EXPORT_SYMBOL_GPL(tgm_subdrv_open);
+
+void tgm_subdrv_close(struct drm_device *dev, struct drm_file *file)
+{
+	struct tgm_subdrv *subdrv;
+
+	list_for_each_entry(subdrv, &tgm_subdrv_list, list) {
+		if (subdrv->close)
+			subdrv->close(dev, subdrv->dev, file);
+	}
+}
+EXPORT_SYMBOL_GPL(tgm_subdrv_close);
+
 static int tgm_drv_load(struct drm_device *drm_dev, unsigned long flags)
 {
 	struct tgm_drv_private *dev_priv;
diff --git a/drivers/gpu/drm/tgm/tgm_drv.h b/drivers/gpu/drm/tgm/tgm_drv.h
index 5af11712b57..a0f0ce07dd1 100644
--- a/drivers/gpu/drm/tgm/tgm_drv.h
+++ b/drivers/gpu/drm/tgm/tgm_drv.h
@@ -33,9 +33,29 @@ struct tgm_drv_file_private {
 	pid_t tgid;
 };
 
+struct tgm_subdrv {
+	struct list_head list;
+	struct device *dev;
+	struct drm_device *drm_dev;
+
+	int (*probe)(struct drm_device *drm_dev, struct device *dev);
+	void (*remove)(struct drm_device *drm_dev, struct device *dev);
+	int (*open)(struct drm_device *drm_dev, struct device *dev,
+			struct drm_file *file);
+	void (*close)(struct drm_device *drm_dev, struct device *dev,
+			struct drm_file *file);
+};
+
 int tgm_drv_component_add(struct device *dev,
 		enum tgm_drv_dev_type dev_type);
 void tgm_drv_component_del(struct device *dev,
 		enum tgm_drv_dev_type dev_type);
 
+int tgm_subdrv_register(struct tgm_subdrv *drm_subdrv);
+int tgm_subdrv_unregister(struct tgm_subdrv *drm_subdrv);
+int tgm_device_subdrv_probe(struct drm_device *dev);
+int tgm_device_subdrv_remove(struct drm_device *dev);
+int tgm_subdrv_open(struct drm_device *dev, struct drm_file *file);
+void tgm_subdrv_close(struct drm_device *dev, struct drm_file *file);
+
 #endif /* _TGM_DRV_H_ */
-- 
2.34.1