350 lines
9.8 KiB
C
350 lines
9.8 KiB
C
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/*
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* Copyright (C) 2013, NVIDIA Corporation. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sub license,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include <linux/backlight.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <drm/drm_crtc.h>
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#include <drm/drm_panel.h>
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#include <drm/drm_print.h>
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static DEFINE_MUTEX(panel_lock);
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static LIST_HEAD(panel_list);
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/**
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* DOC: drm panel
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*
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* The DRM panel helpers allow drivers to register panel objects with a
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* central registry and provide functions to retrieve those panels in display
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* drivers.
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*
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* For easy integration into drivers using the &drm_bridge infrastructure please
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* take look at drm_panel_bridge_add() and devm_drm_panel_bridge_add().
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*/
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/**
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* drm_panel_init - initialize a panel
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* @panel: DRM panel
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* @dev: parent device of the panel
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* @funcs: panel operations
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* @connector_type: the connector type (DRM_MODE_CONNECTOR_*) corresponding to
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* the panel interface
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*
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* Initialize the panel structure for subsequent registration with
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* drm_panel_add().
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*/
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void drm_panel_init(struct drm_panel *panel, struct device *dev,
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const struct drm_panel_funcs *funcs, int connector_type)
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{
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INIT_LIST_HEAD(&panel->list);
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panel->dev = dev;
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panel->funcs = funcs;
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panel->connector_type = connector_type;
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}
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EXPORT_SYMBOL(drm_panel_init);
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/**
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* drm_panel_add - add a panel to the global registry
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* @panel: panel to add
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*
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* Add a panel to the global registry so that it can be looked up by display
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* drivers.
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*/
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void drm_panel_add(struct drm_panel *panel)
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{
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mutex_lock(&panel_lock);
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list_add_tail(&panel->list, &panel_list);
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mutex_unlock(&panel_lock);
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}
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EXPORT_SYMBOL(drm_panel_add);
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/**
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* drm_panel_remove - remove a panel from the global registry
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* @panel: DRM panel
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*
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* Removes a panel from the global registry.
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*/
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void drm_panel_remove(struct drm_panel *panel)
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{
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mutex_lock(&panel_lock);
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list_del_init(&panel->list);
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mutex_unlock(&panel_lock);
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}
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EXPORT_SYMBOL(drm_panel_remove);
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/**
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* drm_panel_prepare - power on a panel
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* @panel: DRM panel
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*
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* Calling this function will enable power and deassert any reset signals to
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* the panel. After this has completed it is possible to communicate with any
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* integrated circuitry via a command bus.
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*
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* Return: 0 on success or a negative error code on failure.
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*/
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int drm_panel_prepare(struct drm_panel *panel)
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{
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if (!panel)
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return -EINVAL;
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if (panel->funcs && panel->funcs->prepare)
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return panel->funcs->prepare(panel);
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return 0;
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}
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EXPORT_SYMBOL(drm_panel_prepare);
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/**
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* drm_panel_unprepare - power off a panel
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* @panel: DRM panel
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*
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* Calling this function will completely power off a panel (assert the panel's
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* reset, turn off power supplies, ...). After this function has completed, it
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* is usually no longer possible to communicate with the panel until another
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* call to drm_panel_prepare().
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*
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* Return: 0 on success or a negative error code on failure.
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*/
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int drm_panel_unprepare(struct drm_panel *panel)
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{
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if (!panel)
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return -EINVAL;
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if (panel->funcs && panel->funcs->unprepare)
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return panel->funcs->unprepare(panel);
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return 0;
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}
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EXPORT_SYMBOL(drm_panel_unprepare);
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/**
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* drm_panel_enable - enable a panel
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* @panel: DRM panel
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*
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* Calling this function will cause the panel display drivers to be turned on
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* and the backlight to be enabled. Content will be visible on screen after
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* this call completes.
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*
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* Return: 0 on success or a negative error code on failure.
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*/
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int drm_panel_enable(struct drm_panel *panel)
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{
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int ret;
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if (!panel)
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return -EINVAL;
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if (panel->funcs && panel->funcs->enable) {
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ret = panel->funcs->enable(panel);
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if (ret < 0)
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return ret;
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}
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ret = backlight_enable(panel->backlight);
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if (ret < 0)
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DRM_DEV_INFO(panel->dev, "failed to enable backlight: %d\n",
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ret);
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return 0;
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}
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EXPORT_SYMBOL(drm_panel_enable);
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/**
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* drm_panel_disable - disable a panel
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* @panel: DRM panel
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*
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* This will typically turn off the panel's backlight or disable the display
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* drivers. For smart panels it should still be possible to communicate with
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* the integrated circuitry via any command bus after this call.
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*
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* Return: 0 on success or a negative error code on failure.
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*/
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int drm_panel_disable(struct drm_panel *panel)
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{
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int ret;
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if (!panel)
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return -EINVAL;
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ret = backlight_disable(panel->backlight);
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if (ret < 0)
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DRM_DEV_INFO(panel->dev, "failed to disable backlight: %d\n",
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ret);
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if (panel->funcs && panel->funcs->disable)
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return panel->funcs->disable(panel);
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return 0;
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}
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EXPORT_SYMBOL(drm_panel_disable);
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/**
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* drm_panel_get_modes - probe the available display modes of a panel
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* @panel: DRM panel
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* @connector: DRM connector
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*
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* The modes probed from the panel are automatically added to the connector
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* that the panel is attached to.
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*
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* Return: The number of modes available from the panel on success or a
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* negative error code on failure.
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*/
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int drm_panel_get_modes(struct drm_panel *panel,
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struct drm_connector *connector)
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{
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if (!panel)
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return -EINVAL;
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if (panel->funcs && panel->funcs->get_modes)
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return panel->funcs->get_modes(panel, connector);
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return -EOPNOTSUPP;
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}
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EXPORT_SYMBOL(drm_panel_get_modes);
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#ifdef CONFIG_OF
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/**
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* of_drm_find_panel - look up a panel using a device tree node
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* @np: device tree node of the panel
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*
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* Searches the set of registered panels for one that matches the given device
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* tree node. If a matching panel is found, return a pointer to it.
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*
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* Return: A pointer to the panel registered for the specified device tree
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* node or an ERR_PTR() if no panel matching the device tree node can be found.
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*
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* Possible error codes returned by this function:
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*
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* - EPROBE_DEFER: the panel device has not been probed yet, and the caller
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* should retry later
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* - ENODEV: the device is not available (status != "okay" or "ok")
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*/
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struct drm_panel *of_drm_find_panel(const struct device_node *np)
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{
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struct drm_panel *panel;
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if (!of_device_is_available(np))
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return ERR_PTR(-ENODEV);
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mutex_lock(&panel_lock);
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list_for_each_entry(panel, &panel_list, list) {
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if (panel->dev->of_node == np) {
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mutex_unlock(&panel_lock);
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return panel;
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}
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}
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mutex_unlock(&panel_lock);
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return ERR_PTR(-EPROBE_DEFER);
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}
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EXPORT_SYMBOL(of_drm_find_panel);
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/**
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* of_drm_get_panel_orientation - look up the orientation of the panel through
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* the "rotation" binding from a device tree node
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* @np: device tree node of the panel
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* @orientation: orientation enum to be filled in
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*
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* Looks up the rotation of a panel in the device tree. The orientation of the
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* panel is expressed as a property name "rotation" in the device tree. The
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* rotation in the device tree is counter clockwise.
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*
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* Return: 0 when a valid rotation value (0, 90, 180, or 270) is read or the
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* rotation property doesn't exist. Return a negative error code on failure.
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*/
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int of_drm_get_panel_orientation(const struct device_node *np,
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enum drm_panel_orientation *orientation)
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{
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int rotation, ret;
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ret = of_property_read_u32(np, "rotation", &rotation);
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if (ret == -EINVAL) {
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/* Don't return an error if there's no rotation property. */
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*orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
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return 0;
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}
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if (ret < 0)
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return ret;
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if (rotation == 0)
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*orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL;
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else if (rotation == 90)
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*orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP;
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else if (rotation == 180)
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*orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
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else if (rotation == 270)
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*orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP;
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else
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return -EINVAL;
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return 0;
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}
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EXPORT_SYMBOL(of_drm_get_panel_orientation);
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#endif
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#if IS_REACHABLE(CONFIG_BACKLIGHT_CLASS_DEVICE)
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/**
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* drm_panel_of_backlight - use backlight device node for backlight
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* @panel: DRM panel
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*
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* Use this function to enable backlight handling if your panel
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* uses device tree and has a backlight phandle.
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*
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* When the panel is enabled backlight will be enabled after a
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* successful call to &drm_panel_funcs.enable()
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*
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* When the panel is disabled backlight will be disabled before the
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* call to &drm_panel_funcs.disable().
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*
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* A typical implementation for a panel driver supporting device tree
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* will call this function at probe time. Backlight will then be handled
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* transparently without requiring any intervention from the driver.
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* drm_panel_of_backlight() must be called after the call to drm_panel_init().
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*
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* Return: 0 on success or a negative error code on failure.
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*/
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int drm_panel_of_backlight(struct drm_panel *panel)
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{
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struct backlight_device *backlight;
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if (!panel || !panel->dev)
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return -EINVAL;
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backlight = devm_of_find_backlight(panel->dev);
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if (IS_ERR(backlight))
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return PTR_ERR(backlight);
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panel->backlight = backlight;
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return 0;
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}
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EXPORT_SYMBOL(drm_panel_of_backlight);
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#endif
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MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
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MODULE_DESCRIPTION("DRM panel infrastructure");
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MODULE_LICENSE("GPL and additional rights");
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