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/*
* Copyright (C) 2014 Traphandler
* Copyright (C) 2014 Free Electrons
* Copyright (C) 2014 Atmel
*
* Author: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
* Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/of_graph.h>
#include <drm/drmP.h>
#include <drm/drm_panel.h>
#include "atmel_hlcdc_dc.h"
/**
* Atmel HLCDC RGB connector structure
*
* This structure stores RGB slave device information.
*
* @connector: DRM connector
* @encoder: DRM encoder
* @dc: pointer to the atmel_hlcdc_dc structure
* @panel: panel connected on the RGB output
*/
struct atmel_hlcdc_rgb_output {
struct drm_connector connector;
struct drm_encoder encoder;
struct atmel_hlcdc_dc *dc;
struct drm_panel *panel;
};
static inline struct atmel_hlcdc_rgb_output *
drm_connector_to_atmel_hlcdc_rgb_output(struct drm_connector *connector)
{
return container_of(connector, struct atmel_hlcdc_rgb_output,
connector);
}
static inline struct atmel_hlcdc_rgb_output *
drm_encoder_to_atmel_hlcdc_rgb_output(struct drm_encoder *encoder)
{
return container_of(encoder, struct atmel_hlcdc_rgb_output, encoder);
}
static void atmel_hlcdc_rgb_encoder_enable(struct drm_encoder *encoder)
{
struct atmel_hlcdc_rgb_output *rgb =
drm_encoder_to_atmel_hlcdc_rgb_output(encoder);
if (rgb->panel) {
drm_panel_prepare(rgb->panel);
drm_panel_enable(rgb->panel);
}
}
static void atmel_hlcdc_rgb_encoder_disable(struct drm_encoder *encoder)
{
struct atmel_hlcdc_rgb_output *rgb =
drm_encoder_to_atmel_hlcdc_rgb_output(encoder);
if (rgb->panel) {
drm_panel_disable(rgb->panel);
drm_panel_unprepare(rgb->panel);
}
}
static const struct drm_encoder_helper_funcs atmel_hlcdc_panel_encoder_helper_funcs = {
.disable = atmel_hlcdc_rgb_encoder_disable,
.enable = atmel_hlcdc_rgb_encoder_enable,
};
static void atmel_hlcdc_rgb_encoder_destroy(struct drm_encoder *encoder)
{
drm_encoder_cleanup(encoder);
memset(encoder, 0, sizeof(*encoder));
}
static const struct drm_encoder_funcs atmel_hlcdc_panel_encoder_funcs = {
.destroy = atmel_hlcdc_rgb_encoder_destroy,
};
static int atmel_hlcdc_panel_get_modes(struct drm_connector *connector)
{
struct atmel_hlcdc_rgb_output *rgb =
drm_connector_to_atmel_hlcdc_rgb_output(connector);
if (rgb->panel)
return rgb->panel->funcs->get_modes(rgb->panel);
return 0;
}
static int atmel_hlcdc_rgb_mode_valid(struct drm_connector *connector,
struct drm_display_mode *mode)
{
struct atmel_hlcdc_rgb_output *rgb =
drm_connector_to_atmel_hlcdc_rgb_output(connector);
return atmel_hlcdc_dc_mode_valid(rgb->dc, mode);
}
static const struct drm_connector_helper_funcs atmel_hlcdc_panel_connector_helper_funcs = {
.get_modes = atmel_hlcdc_panel_get_modes,
.mode_valid = atmel_hlcdc_rgb_mode_valid,
};
static enum drm_connector_status
atmel_hlcdc_panel_connector_detect(struct drm_connector *connector, bool force)
{
struct atmel_hlcdc_rgb_output *rgb =
drm_connector_to_atmel_hlcdc_rgb_output(connector);
if (rgb->panel)
return connector_status_connected;
return connector_status_disconnected;
}
static void
atmel_hlcdc_panel_connector_destroy(struct drm_connector *connector)
{
struct atmel_hlcdc_rgb_output *rgb =
drm_connector_to_atmel_hlcdc_rgb_output(connector);
if (rgb->panel)
drm_panel_detach(rgb->panel);
drm_connector_cleanup(connector);
}
static const struct drm_connector_funcs atmel_hlcdc_panel_connector_funcs = {
.dpms = drm_atomic_helper_connector_dpms,
.detect = atmel_hlcdc_panel_connector_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = atmel_hlcdc_panel_connector_destroy,
.reset = drm_atomic_helper_connector_reset,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};
static int atmel_hlcdc_check_endpoint(struct drm_device *dev,
const struct of_endpoint *ep)
{
struct device_node *np;
void *obj;
np = of_graph_get_remote_port_parent(ep->local_node);
obj = of_drm_find_panel(np);
if (!obj)
obj = of_drm_find_bridge(np);
of_node_put(np);
return obj ? 0 : -EPROBE_DEFER;
}
static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
const struct of_endpoint *ep)
{
struct atmel_hlcdc_dc *dc = dev->dev_private;
struct atmel_hlcdc_rgb_output *output;
struct device_node *np;
struct drm_panel *panel;
struct drm_bridge *bridge;
int ret;
output = devm_kzalloc(dev->dev, sizeof(*output), GFP_KERNEL);
if (!output)
return -EINVAL;
output->dc = dc;
drm_encoder_helper_add(&output->encoder,
&atmel_hlcdc_panel_encoder_helper_funcs);
ret = drm_encoder_init(dev, &output->encoder,
&atmel_hlcdc_panel_encoder_funcs,
DRM_MODE_ENCODER_NONE, NULL);
if (ret)
return ret;
output->encoder.possible_crtcs = 0x1;
np = of_graph_get_remote_port_parent(ep->local_node);
ret = -EPROBE_DEFER;
panel = of_drm_find_panel(np);
if (panel) {
of_node_put(np);
output->connector.dpms = DRM_MODE_DPMS_OFF;
output->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
drm_connector_helper_add(&output->connector,
&atmel_hlcdc_panel_connector_helper_funcs);
ret = drm_connector_init(dev, &output->connector,
&atmel_hlcdc_panel_connector_funcs,
DRM_MODE_CONNECTOR_Unknown);
if (ret)
goto err_encoder_cleanup;
drm_mode_connector_attach_encoder(&output->connector,
&output->encoder);
ret = drm_panel_attach(panel, &output->connector);
if (ret) {
drm_connector_cleanup(&output->connector);
goto err_encoder_cleanup;
}
output->panel = panel;
return 0;
}
bridge = of_drm_find_bridge(np);
of_node_put(np);
if (bridge) {
ret = drm_bridge_attach(&output->encoder, bridge, NULL);
if (!ret)
return 0;
}
err_encoder_cleanup:
drm_encoder_cleanup(&output->encoder);
return ret;
}
int atmel_hlcdc_create_outputs(struct drm_device *dev)
{
struct device_node *ep_np = NULL;
struct of_endpoint ep;
int ret;
for_each_endpoint_of_node(dev->dev->of_node, ep_np) {
ret = of_graph_parse_endpoint(ep_np, &ep);
if (!ret)
ret = atmel_hlcdc_check_endpoint(dev, &ep);
if (ret) {
of_node_put(ep_np);
return ret;
}
}
for_each_endpoint_of_node(dev->dev->of_node, ep_np) {
ret = of_graph_parse_endpoint(ep_np, &ep);
if (!ret)
ret = atmel_hlcdc_attach_endpoint(dev, &ep);
if (ret) {
of_node_put(ep_np);
return ret;
}
}
return 0;
}
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