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/*
* Copyright (C) 2012 Avionic Design GmbH
* Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
*
* 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.
*/
#include <linux/of_gpio.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_panel.h>
#include "drm.h"
int tegra_output_connector_get_modes(struct drm_connector *connector)
{
struct tegra_output *output = connector_to_output(connector);
struct edid *edid = NULL;
int err = 0;
/*
* If the panel provides one or more modes, use them exclusively and
* ignore any other means of obtaining a mode.
*/
if (output->panel) {
err = output->panel->funcs->get_modes(output->panel);
if (err > 0)
return err;
}
if (output->edid)
edid = kmemdup(output->edid, sizeof(*edid), GFP_KERNEL);
else if (output->ddc)
edid = drm_get_edid(connector, output->ddc);
drm_mode_connector_update_edid_property(connector, edid);
if (edid) {
err = drm_add_edid_modes(connector, edid);
kfree(edid);
}
return err;
}
struct drm_encoder *
tegra_output_connector_best_encoder(struct drm_connector *connector)
{
struct tegra_output *output = connector_to_output(connector);
return &output->encoder;
}
enum drm_connector_status
tegra_output_connector_detect(struct drm_connector *connector, bool force)
{
struct tegra_output *output = connector_to_output(connector);
enum drm_connector_status status = connector_status_unknown;
if (gpio_is_valid(output->hpd_gpio)) {
if (gpio_get_value(output->hpd_gpio) == 0)
status = connector_status_disconnected;
else
status = connector_status_connected;
} else {
if (!output->panel)
status = connector_status_disconnected;
else
status = connector_status_connected;
}
return status;
}
void tegra_output_connector_destroy(struct drm_connector *connector)
{
drm_connector_unregister(connector);
drm_connector_cleanup(connector);
}
void tegra_output_encoder_destroy(struct drm_encoder *encoder)
{
drm_encoder_cleanup(encoder);
}
static irqreturn_t hpd_irq(int irq, void *data)
{
struct tegra_output *output = data;
if (output->connector.dev)
drm_helper_hpd_irq_event(output->connector.dev);
return IRQ_HANDLED;
}
int tegra_output_probe(struct tegra_output *output)
{
struct device_node *ddc, *panel;
enum of_gpio_flags flags;
int err, size;
if (!output->of_node)
output->of_node = output->dev->of_node;
panel = of_parse_phandle(output->of_node, "nvidia,panel", 0);
if (panel) {
output->panel = of_drm_find_panel(panel);
if (!output->panel)
return -EPROBE_DEFER;
of_node_put(panel);
}
output->edid = of_get_property(output->of_node, "nvidia,edid", &size);
ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0);
if (ddc) {
output->ddc = of_find_i2c_adapter_by_node(ddc);
if (!output->ddc) {
err = -EPROBE_DEFER;
of_node_put(ddc);
return err;
}
of_node_put(ddc);
}
output->hpd_gpio = of_get_named_gpio_flags(output->of_node,
"nvidia,hpd-gpio", 0,
&flags);
if (gpio_is_valid(output->hpd_gpio)) {
unsigned long flags;
err = gpio_request_one(output->hpd_gpio, GPIOF_DIR_IN,
"HDMI hotplug detect");
if (err < 0) {
dev_err(output->dev, "gpio_request_one(): %d\n", err);
return err;
}
err = gpio_to_irq(output->hpd_gpio);
if (err < 0) {
dev_err(output->dev, "gpio_to_irq(): %d\n", err);
gpio_free(output->hpd_gpio);
return err;
}
output->hpd_irq = err;
flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
IRQF_ONESHOT;
err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
flags, "hpd", output);
if (err < 0) {
dev_err(output->dev, "failed to request IRQ#%u: %d\n",
output->hpd_irq, err);
gpio_free(output->hpd_gpio);
return err;
}
output->connector.polled = DRM_CONNECTOR_POLL_HPD;
/*
* Disable the interrupt until the connector has been
* initialized to avoid a race in the hotplug interrupt
* handler.
*/
disable_irq(output->hpd_irq);
}
return 0;
}
void tegra_output_remove(struct tegra_output *output)
{
if (gpio_is_valid(output->hpd_gpio)) {
free_irq(output->hpd_irq, output);
gpio_free(output->hpd_gpio);
}
if (output->ddc)
put_device(&output->ddc->dev);
}
int tegra_output_init(struct drm_device *drm, struct tegra_output *output)
{
int err;
if (output->panel) {
err = drm_panel_attach(output->panel, &output->connector);
if (err < 0)
return err;
}
/*
* The connector is now registered and ready to receive hotplug events
* so the hotplug interrupt can be enabled.
*/
if (gpio_is_valid(output->hpd_gpio))
enable_irq(output->hpd_irq);
return 0;
}
void tegra_output_exit(struct tegra_output *output)
{
/*
* The connector is going away, so the interrupt must be disabled to
* prevent the hotplug interrupt handler from potentially crashing.
*/
if (gpio_is_valid(output->hpd_gpio))
disable_irq(output->hpd_irq);
if (output->panel)
drm_panel_detach(output->panel);
}
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