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/*
* (C) COPYRIGHT 2012-2013 ARM Limited. All rights reserved.
*
* Parts of this file were based on sources as follows:
*
* Copyright (c) 2006-2008 Intel Corporation
* Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
* Copyright (C) 2011 Texas Instruments
*
* This program is free software and is provided to you under the terms of the
* GNU General Public License version 2 as published by the Free Software
* Foundation, and any use by you of this program is subject to the terms of
* such GNU licence.
*
*/
/**
* pl111_drm_connector.c
* Implementation of the connector functions for PL111 DRM
*/
#include <linux/amba/clcd-regs.h>
#include <linux/version.h>
#include <linux/shmem_fs.h>
#include <linux/dma-buf.h>
#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include "pl111_drm.h"
static void pl111_connector_destroy(struct drm_connector *connector)
{
struct pl111_drm_connector *pl111_connector =
to_pl111_connector(connector);
if (pl111_connector->panel)
drm_panel_detach(pl111_connector->panel);
drm_connector_unregister(connector);
drm_connector_cleanup(connector);
}
static enum drm_connector_status pl111_connector_detect(struct drm_connector
*connector, bool force)
{
struct pl111_drm_connector *pl111_connector =
to_pl111_connector(connector);
return (pl111_connector->panel ?
connector_status_connected :
connector_status_disconnected);
}
static int pl111_connector_helper_get_modes(struct drm_connector *connector)
{
struct pl111_drm_connector *pl111_connector =
to_pl111_connector(connector);
if (!pl111_connector->panel)
return 0;
return drm_panel_get_modes(pl111_connector->panel);
}
const struct drm_connector_funcs connector_funcs = {
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = pl111_connector_destroy,
.detect = pl111_connector_detect,
.dpms = drm_atomic_helper_connector_dpms,
.reset = drm_atomic_helper_connector_reset,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};
const struct drm_connector_helper_funcs connector_helper_funcs = {
.get_modes = pl111_connector_helper_get_modes,
};
/* Walks the OF graph to find the panel node and then asks DRM to look
* up the panel.
*/
static struct drm_panel *pl111_get_panel(struct device *dev)
{
struct device_node *endpoint, *panel_node;
struct device_node *np = dev->of_node;
struct drm_panel *panel;
endpoint = of_graph_get_next_endpoint(np, NULL);
if (!endpoint) {
dev_err(dev, "no endpoint to fetch panel\n");
return NULL;
}
/* don't proceed if we have an endpoint but no panel_node tied to it */
panel_node = of_graph_get_remote_port_parent(endpoint);
of_node_put(endpoint);
if (!panel_node) {
dev_err(dev, "no valid panel node\n");
return NULL;
}
panel = of_drm_find_panel(panel_node);
of_node_put(panel_node);
return panel;
}
int pl111_connector_init(struct drm_device *dev)
{
struct pl111_drm_dev_private *priv = dev->dev_private;
struct pl111_drm_connector *pl111_connector = &priv->connector;
struct drm_connector *connector = &pl111_connector->connector;
drm_connector_init(dev, connector, &connector_funcs,
DRM_MODE_CONNECTOR_DPI);
drm_connector_helper_add(connector, &connector_helper_funcs);
pl111_connector->panel = pl111_get_panel(dev->dev);
if (pl111_connector->panel)
drm_panel_attach(pl111_connector->panel, connector);
return 0;
}
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