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