1 files changed, 341 insertions, 0 deletions
diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
new file mode 100644
index 000000000..10015891b
--- /dev/null
+++ b/include/drm/drm_panel.h
@@ -0,0 +1,341 @@
+/*
+ * Copyright (C) 2013, NVIDIA Corporation.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sub license,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __DRM_PANEL_H__
+#define __DRM_PANEL_H__
+
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+
+struct backlight_device;
+struct dentry;
+struct device_node;
+struct drm_connector;
+struct drm_device;
+struct drm_panel_follower;
+struct drm_panel;
+struct display_timing;
+
+enum drm_panel_orientation;
+
+/**
+ * struct drm_panel_funcs - perform operations on a given panel
+ *
+ * The .prepare() function is typically called before the display controller
+ * starts to transmit video data. Panel drivers can use this to turn the panel
+ * on and wait for it to become ready. If additional configuration is required
+ * (via a control bus such as I2C, SPI or DSI for example) this is a good time
+ * to do that.
+ *
+ * After the display controller has started transmitting video data, it's safe
+ * to call the .enable() function. This will typically enable the backlight to
+ * make the image on screen visible. Some panels require a certain amount of
+ * time or frames before the image is displayed. This function is responsible
+ * for taking this into account before enabling the backlight to avoid visual
+ * glitches.
+ *
+ * Before stopping video transmission from the display controller it can be
+ * necessary to turn off the panel to avoid visual glitches. This is done in
+ * the .disable() function. Analogously to .enable() this typically involves
+ * turning off the backlight and waiting for some time to make sure no image
+ * is visible on the panel. It is then safe for the display controller to
+ * cease transmission of video data.
+ *
+ * To save power when no video data is transmitted, a driver can power down
+ * the panel. This is the job of the .unprepare() function.
+ *
+ * Backlight can be handled automatically if configured using
+ * drm_panel_of_backlight() or drm_panel_dp_aux_backlight(). Then the driver
+ * does not need to implement the functionality to enable/disable backlight.
+ */
+struct drm_panel_funcs {
+	/**
+	 * @prepare:
+	 *
+	 * Turn on panel and perform set up.
+	 *
+	 * This function is optional.
+	 */
+	int (*prepare)(struct drm_panel *panel);
+
+	/**
+	 * @enable:
+	 *
+	 * Enable panel (turn on back light, etc.).
+	 *
+	 * This function is optional.
+	 */
+	int (*enable)(struct drm_panel *panel);
+
+	/**
+	 * @disable:
+	 *
+	 * Disable panel (turn off back light, etc.).
+	 *
+	 * This function is optional.
+	 */
+	int (*disable)(struct drm_panel *panel);
+
+	/**
+	 * @unprepare:
+	 *
+	 * Turn off panel.
+	 *
+	 * This function is optional.
+	 */
+	int (*unprepare)(struct drm_panel *panel);
+
+	/**
+	 * @get_modes:
+	 *
+	 * Add modes to the connector that the panel is attached to
+	 * and returns the number of modes added.
+	 *
+	 * This function is mandatory.
+	 */
+	int (*get_modes)(struct drm_panel *panel,
+			 struct drm_connector *connector);
+
+	/**
+	 * @get_orientation:
+	 *
+	 * Return the panel orientation set by device tree or EDID.
+	 *
+	 * This function is optional.
+	 */
+	enum drm_panel_orientation (*get_orientation)(struct drm_panel *panel);
+
+	/**
+	 * @get_timings:
+	 *
+	 * Copy display timings into the provided array and return
+	 * the number of display timings available.
+	 *
+	 * This function is optional.
+	 */
+	int (*get_timings)(struct drm_panel *panel, unsigned int num_timings,
+			   struct display_timing *timings);
+
+	/**
+	 * @debugfs_init:
+	 *
+	 * Allows panels to create panels-specific debugfs files.
+	 */
+	void (*debugfs_init)(struct drm_panel *panel, struct dentry *root);
+};
+
+struct drm_panel_follower_funcs {
+	/**
+	 * @panel_prepared:
+	 *
+	 * Called after the panel has been powered on.
+	 */
+	int (*panel_prepared)(struct drm_panel_follower *follower);
+
+	/**
+	 * @panel_unpreparing:
+	 *
+	 * Called before the panel is powered off.
+	 */
+	int (*panel_unpreparing)(struct drm_panel_follower *follower);
+};
+
+struct drm_panel_follower {
+	/**
+	 * @funcs:
+	 *
+	 * Dependent device callbacks; should be initted by the caller.
+	 */
+	const struct drm_panel_follower_funcs *funcs;
+
+	/**
+	 * @list
+	 *
+	 * Used for linking into panel's list; set by drm_panel_add_follower().
+	 */
+	struct list_head list;
+
+	/**
+	 * @panel
+	 *
+	 * The panel we're dependent on; set by drm_panel_add_follower().
+	 */
+	struct drm_panel *panel;
+};
+
+/**
+ * struct drm_panel - DRM panel object
+ */
+struct drm_panel {
+	/**
+	 * @dev:
+	 *
+	 * Parent device of the panel.
+	 */
+	struct device *dev;
+
+	/**
+	 * @backlight:
+	 *
+	 * Backlight device, used to turn on backlight after the call
+	 * to enable(), and to turn off backlight before the call to
+	 * disable().
+	 * backlight is set by drm_panel_of_backlight() or
+	 * drm_panel_dp_aux_backlight() and drivers shall not assign it.
+	 */
+	struct backlight_device *backlight;
+
+	/**
+	 * @funcs:
+	 *
+	 * Operations that can be performed on the panel.
+	 */
+	const struct drm_panel_funcs *funcs;
+
+	/**
+	 * @connector_type:
+	 *
+	 * Type of the panel as a DRM_MODE_CONNECTOR_* value. This is used to
+	 * initialise the drm_connector corresponding to the panel with the
+	 * correct connector type.
+	 */
+	int connector_type;
+
+	/**
+	 * @list:
+	 *
+	 * Panel entry in registry.
+	 */
+	struct list_head list;
+
+	/**
+	 * @followers:
+	 *
+	 * A list of struct drm_panel_follower dependent on this panel.
+	 */
+	struct list_head followers;
+
+	/**
+	 * @follower_lock:
+	 *
+	 * Lock for followers list.
+	 */
+	struct mutex follower_lock;
+
+	/**
+	 * @prepare_prev_first:
+	 *
+	 * The previous controller should be prepared first, before the prepare
+	 * for the panel is called. This is largely required for DSI panels
+	 * where the DSI host controller should be initialised to LP-11 before
+	 * the panel is powered up.
+	 */
+	bool prepare_prev_first;
+
+	/**
+	 * @prepared:
+	 *
+	 * If true then the panel has been prepared.
+	 */
+	bool prepared;
+
+	/**
+	 * @enabled:
+	 *
+	 * If true then the panel has been enabled.
+	 */
+	bool enabled;
+};
+
+void drm_panel_init(struct drm_panel *panel, struct device *dev,
+		    const struct drm_panel_funcs *funcs,
+		    int connector_type);
+
+void drm_panel_add(struct drm_panel *panel);
+void drm_panel_remove(struct drm_panel *panel);
+
+int drm_panel_prepare(struct drm_panel *panel);
+int drm_panel_unprepare(struct drm_panel *panel);
+
+int drm_panel_enable(struct drm_panel *panel);
+int drm_panel_disable(struct drm_panel *panel);
+
+int drm_panel_get_modes(struct drm_panel *panel, struct drm_connector *connector);
+
+#if defined(CONFIG_OF) && defined(CONFIG_DRM_PANEL)
+struct drm_panel *of_drm_find_panel(const struct device_node *np);
+int of_drm_get_panel_orientation(const struct device_node *np,
+				 enum drm_panel_orientation *orientation);
+#else
+static inline struct drm_panel *of_drm_find_panel(const struct device_node *np)
+{
+	return ERR_PTR(-ENODEV);
+}
+
+static inline int of_drm_get_panel_orientation(const struct device_node *np,
+					       enum drm_panel_orientation *orientation)
+{
+	return -ENODEV;
+}
+#endif
+
+#if defined(CONFIG_DRM_PANEL)
+bool drm_is_panel_follower(struct device *dev);
+int drm_panel_add_follower(struct device *follower_dev,
+			   struct drm_panel_follower *follower);
+void drm_panel_remove_follower(struct drm_panel_follower *follower);
+int devm_drm_panel_add_follower(struct device *follower_dev,
+				struct drm_panel_follower *follower);
+#else
+static inline bool drm_is_panel_follower(struct device *dev)
+{
+	return false;
+}
+
+static inline int drm_panel_add_follower(struct device *follower_dev,
+					 struct drm_panel_follower *follower)
+{
+	return -ENODEV;
+}
+
+static inline void drm_panel_remove_follower(struct drm_panel_follower *follower) { }
+static inline int devm_drm_panel_add_follower(struct device *follower_dev,
+					      struct drm_panel_follower *follower)
+{
+	return -ENODEV;
+}
+#endif
+
+#if IS_ENABLED(CONFIG_DRM_PANEL) && (IS_BUILTIN(CONFIG_BACKLIGHT_CLASS_DEVICE) || \
+	(IS_MODULE(CONFIG_DRM) && IS_MODULE(CONFIG_BACKLIGHT_CLASS_DEVICE)))
+int drm_panel_of_backlight(struct drm_panel *panel);
+#else
+static inline int drm_panel_of_backlight(struct drm_panel *panel)
+{
+	return 0;
+}
+#endif
+
+#endif