Commit 04f0ff02 authored by Tomi Valkeinen's avatar Tomi Valkeinen
Browse files

OMAPDSS: Add new simple DPI panel driver 



Add simple DPI Panel driver which uses the new DSS device model and DSS
ops. A "simple" panel means one that does not require any special setup.

Signed-off-by: default avatarTomi Valkeinen <tomi.valkeinen@ti.com>
parent 61a7f24a

drivers/video/omap2/displays-new/Kconfig

+5 −0
Original line number Diff line number Diff line
@@ -28,4 +28,9 @@ config DISPLAY_CONNECTOR_ANALOG_TV 
	help

	  Driver for a generic analog TV connector.



config DISPLAY_PANEL_DPI

	tristate "Generic DPI panel"

	help

	  Driver for generic DPI panels.



endmenu

drivers/video/omap2/displays-new/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -3,3 +3,4 @@ obj-$(CONFIG_DISPLAY_ENCODER_TPD12S015) += encoder-tpd12s015.o 
obj-$(CONFIG_DISPLAY_CONNECTOR_DVI) += connector-dvi.o

obj-$(CONFIG_DISPLAY_CONNECTOR_HDMI) += connector-hdmi.o

obj-$(CONFIG_DISPLAY_CONNECTOR_ANALOG_TV) += connector-analog-tv.o

obj-$(CONFIG_DISPLAY_PANEL_DPI) += panel-dpi.o

drivers/video/omap2/displays-new/panel-dpi.c

0 → 100644
+270 −0
Original line number Diff line number Diff line 
/*

 * Generic MIPI DPI Panel Driver

 *

 * Copyright (C) 2013 Texas Instruments

 * 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.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/slab.h>



#include <video/omapdss.h>

#include <video/omap-panel-data.h>



struct panel_drv_data {

	struct omap_dss_device dssdev;

	struct omap_dss_device *in;



	int data_lines;



	struct omap_video_timings videomode;



	int backlight_gpio;

	int enable_gpio;

};



#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)



static int panel_dpi_connect(struct omap_dss_device *dssdev)

{

	struct panel_drv_data *ddata = to_panel_data(dssdev);

	struct omap_dss_device *in = ddata->in;

	int r;



	if (omapdss_device_is_connected(dssdev))

		return 0;



	r = in->ops.dpi->connect(in, dssdev);

	if (r)

		return r;



	return 0;

}



static void panel_dpi_disconnect(struct omap_dss_device *dssdev)

{

	struct panel_drv_data *ddata = to_panel_data(dssdev);

	struct omap_dss_device *in = ddata->in;



	if (!omapdss_device_is_connected(dssdev))

		return;



	in->ops.dpi->disconnect(in, dssdev);

}



static int panel_dpi_enable(struct omap_dss_device *dssdev)

{

	struct panel_drv_data *ddata = to_panel_data(dssdev);

	struct omap_dss_device *in = ddata->in;

	int r;



	if (!omapdss_device_is_connected(dssdev))

		return -ENODEV;



	if (omapdss_device_is_enabled(dssdev))

		return 0;



	in->ops.dpi->set_data_lines(in, ddata->data_lines);

	in->ops.dpi->set_timings(in, &ddata->videomode);



	r = in->ops.dpi->enable(in);

	if (r)

		return r;



	if (gpio_is_valid(ddata->enable_gpio))

		gpio_set_value_cansleep(ddata->enable_gpio, 1);



	if (gpio_is_valid(ddata->backlight_gpio))

		gpio_set_value_cansleep(ddata->backlight_gpio, 1);



	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 *in = ddata->in;



	if (!omapdss_device_is_enabled(dssdev))

		return;



	if (gpio_is_valid(ddata->enable_gpio))

		gpio_set_value_cansleep(ddata->enable_gpio, 0);



	if (gpio_is_valid(ddata->backlight_gpio))

		gpio_set_value_cansleep(ddata->backlight_gpio, 0);



	in->ops.dpi->disable(in);



	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;

}



static void panel_dpi_set_timings(struct omap_dss_device *dssdev,

		struct omap_video_timings *timings)

{

	struct panel_drv_data *ddata = to_panel_data(dssdev);

	struct omap_dss_device *in = ddata->in;



	ddata->videomode = *timings;

	dssdev->panel.timings = *timings;



	in->ops.dpi->set_timings(in, timings);

}



static void panel_dpi_get_timings(struct omap_dss_device *dssdev,

		struct omap_video_timings *timings)

{

	struct panel_drv_data *ddata = to_panel_data(dssdev);



	*timings = ddata->videomode;

}



static int panel_dpi_check_timings(struct omap_dss_device *dssdev,

		struct omap_video_timings *timings)

{

	struct panel_drv_data *ddata = to_panel_data(dssdev);

	struct omap_dss_device *in = ddata->in;



	return in->ops.dpi->check_timings(in, timings);

}



static struct omap_dss_driver panel_dpi_ops = {

	.connect	= panel_dpi_connect,

	.disconnect	= panel_dpi_disconnect,



	.enable		= panel_dpi_enable,

	.disable	= panel_dpi_disable,



	.set_timings	= panel_dpi_set_timings,

	.get_timings	= panel_dpi_get_timings,

	.check_timings	= panel_dpi_check_timings,



	.get_resolution	= omapdss_default_get_resolution,

};



static int panel_dpi_probe_pdata(struct platform_device *pdev)

{

	const struct panel_dpi_platform_data *pdata;

	struct panel_drv_data *ddata = platform_get_drvdata(pdev);

	struct omap_dss_device *dssdev, *in;

	struct videomode vm;



	pdata = dev_get_platdata(&pdev->dev);



	in = omap_dss_find_output(pdata->source);

	if (in == NULL) {

		dev_err(&pdev->dev, "failed to find video source '%s'\n",

				pdata->source);

		return -EPROBE_DEFER;

	}



	ddata->in = in;



	ddata->data_lines = pdata->data_lines;



	videomode_from_timing(pdata->display_timing, &vm);

	videomode_to_omap_video_timings(&vm, &ddata->videomode);



	dssdev = &ddata->dssdev;

	dssdev->name = pdata->name;



	ddata->enable_gpio = pdata->enable_gpio;

	ddata->backlight_gpio = pdata->backlight_gpio;



	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);



	if (dev_get_platdata(&pdev->dev)) {

		r = panel_dpi_probe_pdata(pdev);

		if (r)

			return r;

	} else {

		return -ENODEV;

	}



	if (gpio_is_valid(ddata->enable_gpio)) {

		r = devm_gpio_request_one(&pdev->dev, ddata->enable_gpio,

				GPIOF_OUT_INIT_LOW, "panel enable");

		if (r)

			goto err_gpio;

	}



	if (gpio_is_valid(ddata->backlight_gpio)) {

		r = devm_gpio_request_one(&pdev->dev, ddata->backlight_gpio,

				GPIOF_OUT_INIT_LOW, "panel backlight");

		if (r)

			goto err_gpio;

	}



	dssdev = &ddata->dssdev;

	dssdev->dev = &pdev->dev;

	dssdev->driver = &panel_dpi_ops;

	dssdev->type = OMAP_DISPLAY_TYPE_DPI;

	dssdev->owner = THIS_MODULE;

	dssdev->panel.timings = ddata->videomode;

	dssdev->phy.dpi.data_lines = ddata->data_lines;



	r = omapdss_register_display(dssdev);

	if (r) {

		dev_err(&pdev->dev, "Failed to register panel\n");

		goto err_reg;

	}



	return 0;



err_reg:

err_gpio:

	omap_dss_put_device(ddata->in);

	return r;

}



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;

	struct omap_dss_device *in = ddata->in;



	omapdss_unregister_display(dssdev);



	panel_dpi_disable(dssdev);

	panel_dpi_disconnect(dssdev);



	omap_dss_put_device(in);



	return 0;

}



static struct platform_driver panel_dpi_driver = {

	.probe = panel_dpi_probe,

	.remove = __exit_p(panel_dpi_remove),

	.driver = {

		.name = "panel-dpi",

		.owner = THIS_MODULE,

	},

};



module_platform_driver(panel_dpi_driver);



MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");

MODULE_DESCRIPTION("Generic MIPI DPI Panel Driver");

MODULE_LICENSE("GPL");

include/video/omap-panel-data.h

+23 −0
Original line number Diff line number Diff line
@@ -27,6 +27,8 @@ 
#ifndef __OMAP_PANEL_DATA_H

#define __OMAP_PANEL_DATA_H



#include <video/display_timing.h>



struct omap_dss_device;



/**
@@ -213,4 +215,25 @@ struct connector_atv_platform_data { 
	bool invert_polarity;

};



/**

 * panel_dpi platform data

 * @name: name for this display entity

 * @source: name of the display entity used as a video source

 * @data_lines: number of DPI datalines

 * @display_timing: timings for this panel

 * @backlight_gpio: gpio to enable/disable the backlight (or -1)

 * @enable_gpio: gpio to enable/disable the panel (or -1)

 */

struct panel_dpi_platform_data {

	const char *name;

	const char *source;



	int data_lines;



	const struct display_timing *display_timing;



	int backlight_gpio;

	int enable_gpio;

};



#endif /* __OMAP_PANEL_DATA_H */