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/*
* Generic MIPI DPI Panel Driver
*
* Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
* Author: Tomi Valkeinen <tomi.valkeinen@ti.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.
*/
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/regulator/consumer.h>
#include <linux/backlight.h>
#include <video/of_display_timing.h>
#include "../dss/omapdss.h"
struct panel_drv_data {
struct omap_dss_device dssdev;
struct videomode vm;
struct backlight_device *backlight;
struct gpio_desc *enable_gpio;
struct regulator *vcc_supply;
};
#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
static int panel_dpi_connect(struct omap_dss_device *src,
struct omap_dss_device *dst)
{
return 0;
}
static void panel_dpi_disconnect(struct omap_dss_device *src,
struct omap_dss_device *dst)
{
}
static int panel_dpi_enable(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
struct omap_dss_device *src = dssdev->src;
int r;
if (!omapdss_device_is_connected(dssdev))
return -ENODEV;
if (omapdss_device_is_enabled(dssdev))
return 0;
r = src->ops->enable(src);
if (r)
return r;
r = regulator_enable(ddata->vcc_supply);
if (r) {
src->ops->disable(src);
return r;
}
gpiod_set_value_cansleep(ddata->enable_gpio, 1);
backlight_enable(ddata->backlight);
dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
return 0;
}
static void panel_dpi_disable(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
struct omap_dss_device *src = dssdev->src;
if (!omapdss_device_is_enabled(dssdev))
return;
backlight_disable(ddata->backlight);
gpiod_set_value_cansleep(ddata->enable_gpio, 0);
regulator_disable(ddata->vcc_supply);
src->ops->disable(src);
dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
}
static void panel_dpi_get_timings(struct omap_dss_device *dssdev,
struct videomode *vm)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
*vm = ddata->vm;
}
static const struct omap_dss_device_ops panel_dpi_ops = {
.connect = panel_dpi_connect,
.disconnect = panel_dpi_disconnect,
.enable = panel_dpi_enable,
.disable = panel_dpi_disable,
.get_timings = panel_dpi_get_timings,
};
static int panel_dpi_probe_of(struct platform_device *pdev)
{
struct panel_drv_data *ddata = platform_get_drvdata(pdev);
struct device_node *node = pdev->dev.of_node;
int r;
struct display_timing timing;
struct gpio_desc *gpio;
gpio = devm_gpiod_get_optional(&pdev->dev, "enable", GPIOD_OUT_LOW);
if (IS_ERR(gpio))
return PTR_ERR(gpio);
ddata->enable_gpio = gpio;
/*
* Many different panels are supported by this driver and there are
* probably very different needs for their reset pins in regards to
* timing and order relative to the enable gpio. So for now it's just
* ensured that the reset line isn't active.
*/
gpio = devm_gpiod_get_optional(&pdev->dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(gpio))
return PTR_ERR(gpio);
ddata->vcc_supply = devm_regulator_get(&pdev->dev, "vcc");
if (IS_ERR(ddata->vcc_supply))
return PTR_ERR(ddata->vcc_supply);
ddata->backlight = devm_of_find_backlight(&pdev->dev);
if (IS_ERR(ddata->backlight))
return PTR_ERR(ddata->backlight);
r = of_get_display_timing(node, "panel-timing", &timing);
if (r) {
dev_err(&pdev->dev, "failed to get video timing\n");
return r;
}
videomode_from_timing(&timing, &ddata->vm);
return 0;
}
static int panel_dpi_probe(struct platform_device *pdev)
{
struct panel_drv_data *ddata;
struct omap_dss_device *dssdev;
int r;
ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
if (ddata == NULL)
return -ENOMEM;
platform_set_drvdata(pdev, ddata);
r = panel_dpi_probe_of(pdev);
if (r)
return r;
dssdev = &ddata->dssdev;
dssdev->dev = &pdev->dev;
dssdev->ops = &panel_dpi_ops;
dssdev->type = OMAP_DISPLAY_TYPE_DPI;
dssdev->owner = THIS_MODULE;
dssdev->of_ports = BIT(0);
drm_bus_flags_from_videomode(&ddata->vm, &dssdev->bus_flags);
omapdss_display_init(dssdev);
omapdss_device_register(dssdev);
return 0;
}
static int __exit panel_dpi_remove(struct platform_device *pdev)
{
struct panel_drv_data *ddata = platform_get_drvdata(pdev);
struct omap_dss_device *dssdev = &ddata->dssdev;
omapdss_device_unregister(dssdev);
panel_dpi_disable(dssdev);
return 0;
}
static const struct of_device_id panel_dpi_of_match[] = {
{ .compatible = "omapdss,panel-dpi", },
{},
};
MODULE_DEVICE_TABLE(of, panel_dpi_of_match);
static struct platform_driver panel_dpi_driver = {
.probe = panel_dpi_probe,
.remove = __exit_p(panel_dpi_remove),
.driver = {
.name = "panel-dpi",
.of_match_table = panel_dpi_of_match,
.suppress_bind_attrs = true,
},
};
module_platform_driver(panel_dpi_driver);
MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
MODULE_DESCRIPTION("Generic MIPI DPI Panel Driver");
MODULE_LICENSE("GPL");
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