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/*
* simple panel support for barebox
*
* (C) Copyright 2014 Sascha Hauer, Pengutronix
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* 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.
*
*/
#include <common.h>
#include <malloc.h>
#include <init.h>
#include <linux/err.h>
#include <of.h>
#include <fb.h>
#include <gpio.h>
#include <of_gpio.h>
#include <video/backlight.h>
#include <video/vpl.h>
#include <i2c/i2c.h>
struct simple_panel {
struct device_d *dev;
struct vpl vpl;
int enable_gpio;
int enable_active_high;
int enabled;
struct device_node *backlight_node;
struct backlight_device *backlight;
struct device_node *ddc_node;
int enable_delay;
};
static int simple_panel_enable(struct simple_panel *panel)
{
int ret;
dev_dbg(panel->dev, "enabling\n");
if (panel->backlight_node && !panel->backlight) {
panel->backlight = of_backlight_find(panel->backlight_node);
if (!panel->backlight) {
dev_err(panel->dev, "Cannot find backlight\n");
return -ENODEV;
}
}
if (gpio_is_valid(panel->enable_gpio))
gpio_direction_output(panel->enable_gpio,
panel->enable_active_high);
if (panel->enable_delay)
mdelay(panel->enable_delay);
if (panel->backlight) {
ret = backlight_set_brightness_default(panel->backlight);
if (ret)
return ret;
}
return 0;
}
static int simple_panel_disable(struct simple_panel *panel)
{
dev_dbg(panel->dev, "disabling\n");
if (panel->backlight)
backlight_set_brightness(panel->backlight, 0);
if (gpio_is_valid(panel->enable_gpio))
gpio_direction_output(panel->enable_gpio,
!panel->enable_active_high);
return 0;
}
static int simple_panel_get_modes(struct simple_panel *panel, struct display_timings *timings)
{
struct display_timings *modes;
int ret;
if (panel->ddc_node && IS_ENABLED(CONFIG_DRIVER_VIDEO_EDID) &&
IS_ENABLED(CONFIG_I2C)) {
struct i2c_adapter *i2c;
i2c = of_find_i2c_adapter_by_node(panel->ddc_node);
if (!i2c) {
dev_err(panel->dev, "cannot find edid i2c node\n");
return -ENODEV;
}
timings->edid = edid_read_i2c(i2c);
if (!timings->edid) {
dev_err(panel->dev, "cannot read edid data\n");
return -EINVAL;
}
ret = edid_to_display_timings(timings, timings->edid);
if (ret) {
dev_err(panel->dev, "cannot convert edid data to timings\n");
return ret;
}
}
modes = of_get_display_timings(panel->dev->device_node);
if (modes) {
timings->modes = modes->modes;
timings->num_modes = modes->num_modes;
return 0;
}
dev_err(panel->dev, "No modes found\n");
return -ENOENT;
}
static int simple_panel_ioctl(struct vpl *vpl, unsigned int port,
unsigned int cmd, void *ptr)
{
struct simple_panel *panel = container_of(vpl,
struct simple_panel, vpl);
switch (cmd) {
case VPL_ENABLE:
return simple_panel_enable(panel);
case VPL_DISABLE:
return simple_panel_disable(panel);
case VPL_GET_VIDEOMODES:
return simple_panel_get_modes(panel, ptr);
default:
return -ENOSYS;
}
}
static int simple_panel_probe(struct device_d *dev)
{
struct simple_panel *panel;
struct device_node *node = dev->device_node;
enum of_gpio_flags flags;
int ret;
panel = xzalloc(sizeof(*panel));
panel->enable_gpio = of_get_named_gpio_flags(node, "enable-gpios", 0, &flags);
panel->vpl.node = node;
panel->vpl.ioctl = simple_panel_ioctl;
panel->dev = dev;
if (gpio_is_valid(panel->enable_gpio)) {
if (!(flags & OF_GPIO_ACTIVE_LOW))
panel->enable_active_high = 1;
}
panel->ddc_node = of_parse_phandle(node, "ddc-i2c-bus", 0);
of_property_read_u32(node, "enable-delay", &panel->enable_delay);
panel->backlight_node = of_parse_phandle(node, "backlight", 0);
ret = vpl_register(&panel->vpl);
if (ret)
return ret;
return 0;
}
static struct of_device_id simple_panel_of_ids[] = {
{ .compatible = "simple-panel", },
{ }
};
static struct driver_d simple_panel_driver = {
.name = "simple-panel",
.probe = simple_panel_probe,
.of_compatible = DRV_OF_COMPAT(simple_panel_of_ids),
};
device_platform_driver(simple_panel_driver);
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