drivers/staging/imx-drm/parallel-display.c - linux - Git at Google

 /*
  * i.MX drm driver - parallel display implementation
  *
  * Copyright (C) 2012 Sascha Hauer, Pengutronix
  *
  * 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.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  * MA 02110-1301, USA.
  */

 #include <linux/module.h>
 #include <drm/drmP.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_crtc_helper.h>
 #include <linux/videodev2.h>

 #include "imx-drm.h"

 #define con_to_imxpd(x) container_of(x, struct imx_parallel_display, connector)
 #define enc_to_imxpd(x) container_of(x, struct imx_parallel_display, encoder)

 struct imx_parallel_display {
 	struct drm_connector connector;
 	struct imx_drm_connector *imx_drm_connector;
 	struct drm_encoder encoder;
 	struct imx_drm_encoder *imx_drm_encoder;
 	struct device *dev;
 	void *edid;
 	int edid_len;
 	u32 interface_pix_fmt;
 	int mode_valid;
 	struct drm_display_mode mode;
 };

 static enum drm_connector_status imx_pd_connector_detect(
 		struct drm_connector *connector, bool force)
 {
 	return connector_status_connected;
 }

 static void imx_pd_connector_destroy(struct drm_connector *connector)
 {
 	/* do not free here */
 }

 static int imx_pd_connector_get_modes(struct drm_connector *connector)
 {
 	struct imx_parallel_display *imxpd = con_to_imxpd(connector);
 	int num_modes = 0;

 	if (imxpd->edid) {
 		drm_mode_connector_update_edid_property(connector, imxpd->edid);
 		num_modes = drm_add_edid_modes(connector, imxpd->edid);
 	}

 	if (imxpd->mode_valid) {
 		struct drm_display_mode *mode = drm_mode_create(connector->dev);
 		drm_mode_copy(mode, &imxpd->mode);
 		mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
 		drm_mode_probed_add(connector, mode);
 		num_modes++;
 	}

 	return num_modes;
 }

 static int imx_pd_connector_mode_valid(struct drm_connector *connector,
 			  struct drm_display_mode *mode)
 {
 	return 0;
 }

 static struct drm_encoder *imx_pd_connector_best_encoder(
 		struct drm_connector *connector)
 {
 	struct imx_parallel_display *imxpd = con_to_imxpd(connector);

 	return &imxpd->encoder;
 }

 static void imx_pd_encoder_dpms(struct drm_encoder *encoder, int mode)
 {
 }

 static bool imx_pd_encoder_mode_fixup(struct drm_encoder *encoder,
 			   const struct drm_display_mode *mode,
 			   struct drm_display_mode *adjusted_mode)
 {
 	return true;
 }

 static void imx_pd_encoder_prepare(struct drm_encoder *encoder)
 {
 	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);

 	imx_drm_crtc_panel_format(encoder->crtc, DRM_MODE_ENCODER_NONE,
 			imxpd->interface_pix_fmt);
 }

 static void imx_pd_encoder_commit(struct drm_encoder *encoder)
 {
 }

 static void imx_pd_encoder_mode_set(struct drm_encoder *encoder,
 			 struct drm_display_mode *mode,
 			 struct drm_display_mode *adjusted_mode)
 {
 }

 static void imx_pd_encoder_disable(struct drm_encoder *encoder)
 {
 }

 static void imx_pd_encoder_destroy(struct drm_encoder *encoder)
 {
 	/* do not free here */
 }

 static struct drm_connector_funcs imx_pd_connector_funcs = {
 	.dpms = drm_helper_connector_dpms,
 	.fill_modes = drm_helper_probe_single_connector_modes,
 	.detect = imx_pd_connector_detect,
 	.destroy = imx_pd_connector_destroy,
 };

 static struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
 	.get_modes = imx_pd_connector_get_modes,
 	.best_encoder = imx_pd_connector_best_encoder,
 	.mode_valid = imx_pd_connector_mode_valid,
 };

 static struct drm_encoder_funcs imx_pd_encoder_funcs = {
 	.destroy = imx_pd_encoder_destroy,
 };

 static struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
 	.dpms = imx_pd_encoder_dpms,
 	.mode_fixup = imx_pd_encoder_mode_fixup,
 	.prepare = imx_pd_encoder_prepare,
 	.commit = imx_pd_encoder_commit,
 	.mode_set = imx_pd_encoder_mode_set,
 	.disable = imx_pd_encoder_disable,
 };

 static int imx_pd_register(struct imx_parallel_display *imxpd)
 {
 	int ret;

 	drm_mode_connector_attach_encoder(&imxpd->connector, &imxpd->encoder);

 	imxpd->connector.funcs = &imx_pd_connector_funcs;
 	imxpd->encoder.funcs = &imx_pd_encoder_funcs;

 	imxpd->encoder.encoder_type = DRM_MODE_ENCODER_NONE;
 	imxpd->connector.connector_type = DRM_MODE_CONNECTOR_VGA;

 	drm_encoder_helper_add(&imxpd->encoder, &imx_pd_encoder_helper_funcs);
 	ret = imx_drm_add_encoder(&imxpd->encoder, &imxpd->imx_drm_encoder,
 			THIS_MODULE);
 	if (ret) {
 		dev_err(imxpd->dev, "adding encoder failed with %d\n", ret);
 		return ret;
 	}

 	drm_connector_helper_add(&imxpd->connector,
 			&imx_pd_connector_helper_funcs);

 	ret = imx_drm_add_connector(&imxpd->connector,
 			&imxpd->imx_drm_connector, THIS_MODULE);
 	if (ret) {
 		imx_drm_remove_encoder(imxpd->imx_drm_encoder);
 		dev_err(imxpd->dev, "adding connector failed with %d\n", ret);
 		return ret;
 	}

 	imxpd->connector.encoder = &imxpd->encoder;

 	return 0;
 }

 static int __devinit imx_pd_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
 	const u8 *edidp;
 	struct imx_parallel_display *imxpd;
 	int ret;
 	const char *fmt;

 	imxpd = devm_kzalloc(&pdev->dev, sizeof(*imxpd), GFP_KERNEL);
 	if (!imxpd)
 		return -ENOMEM;

 	edidp = of_get_property(np, "edid", &imxpd->edid_len);
 	if (edidp)
 		imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);

 	ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
 	if (!ret) {
 		if (!strcmp(fmt, "rgb24"))
 			imxpd->interface_pix_fmt = V4L2_PIX_FMT_RGB24;
 		else if (!strcmp(fmt, "rgb565"))
 			imxpd->interface_pix_fmt = V4L2_PIX_FMT_RGB565;
 	}

 	imxpd->dev = &pdev->dev;

 	ret = imx_pd_register(imxpd);
 	if (ret)
 		return ret;

 	ret = imx_drm_encoder_add_possible_crtcs(imxpd->imx_drm_encoder, np);

 	platform_set_drvdata(pdev, imxpd);

 	return 0;
 }

 static int __devexit imx_pd_remove(struct platform_device *pdev)
 {
 	struct imx_parallel_display *imxpd = platform_get_drvdata(pdev);
 	struct drm_connector *connector = &imxpd->connector;
 	struct drm_encoder *encoder = &imxpd->encoder;

 	drm_mode_connector_detach_encoder(connector, encoder);

 	imx_drm_remove_connector(imxpd->imx_drm_connector);
 	imx_drm_remove_encoder(imxpd->imx_drm_encoder);

 	return 0;
 }

 static const struct of_device_id imx_pd_dt_ids[] = {
 	{ .compatible = "fsl,imx-parallel-display", },
 	{ /* sentinel */ }
 };

 static struct platform_driver imx_pd_driver = {
 	.probe		= imx_pd_probe,
 	.remove		= __devexit_p(imx_pd_remove),
 	.driver		= {
 		.of_match_table = imx_pd_dt_ids,
 		.name	= "imx-parallel-display",
 		.owner	= THIS_MODULE,
 	},
 };

 module_platform_driver(imx_pd_driver);

 MODULE_DESCRIPTION("i.MX parallel display driver");
 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
 MODULE_LICENSE("GPL");
	/*
	* i.MX drm driver - parallel display implementation
	*
	* Copyright (C) 2012 Sascha Hauer, Pengutronix
	*
	* 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.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
	* MA 02110-1301, USA.
	*/

	#include <linux/module.h>
	#include <drm/drmP.h>
	#include <drm/drm_fb_helper.h>
	#include <drm/drm_crtc_helper.h>
	#include <linux/videodev2.h>

	#include "imx-drm.h"

	#define con_to_imxpd(x) container_of(x, struct imx_parallel_display, connector)
	#define enc_to_imxpd(x) container_of(x, struct imx_parallel_display, encoder)

	struct imx_parallel_display {
	struct drm_connector connector;
	struct imx_drm_connector *imx_drm_connector;
	struct drm_encoder encoder;
	struct imx_drm_encoder *imx_drm_encoder;
	struct device *dev;
	void *edid;
	int edid_len;
	u32 interface_pix_fmt;
	int mode_valid;
	struct drm_display_mode mode;
	};

	static enum drm_connector_status imx_pd_connector_detect(
	struct drm_connector *connector, bool force)
	{
	return connector_status_connected;
	}

	static void imx_pd_connector_destroy(struct drm_connector *connector)
	{
	/* do not free here */
	}

	static int imx_pd_connector_get_modes(struct drm_connector *connector)
	{
	struct imx_parallel_display *imxpd = con_to_imxpd(connector);
	int num_modes = 0;

	if (imxpd->edid) {
	drm_mode_connector_update_edid_property(connector, imxpd->edid);
	num_modes = drm_add_edid_modes(connector, imxpd->edid);
	}

	if (imxpd->mode_valid) {
	struct drm_display_mode *mode = drm_mode_create(connector->dev);
	drm_mode_copy(mode, &imxpd->mode);
	mode->type \|= DRM_MODE_TYPE_DRIVER \| DRM_MODE_TYPE_PREFERRED,
	drm_mode_probed_add(connector, mode);
	num_modes++;
	}

	return num_modes;
	}

	static int imx_pd_connector_mode_valid(struct drm_connector *connector,
	struct drm_display_mode *mode)
	{
	return 0;
	}

	static struct drm_encoder *imx_pd_connector_best_encoder(
	struct drm_connector *connector)
	{
	struct imx_parallel_display *imxpd = con_to_imxpd(connector);

	return &imxpd->encoder;
	}

	static void imx_pd_encoder_dpms(struct drm_encoder *encoder, int mode)
	{
	}

	static bool imx_pd_encoder_mode_fixup(struct drm_encoder *encoder,
	const struct drm_display_mode *mode,
	struct drm_display_mode *adjusted_mode)
	{
	return true;
	}

	static void imx_pd_encoder_prepare(struct drm_encoder *encoder)
	{
	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);

	imx_drm_crtc_panel_format(encoder->crtc, DRM_MODE_ENCODER_NONE,
	imxpd->interface_pix_fmt);
	}

	static void imx_pd_encoder_commit(struct drm_encoder *encoder)
	{
	}

	static void imx_pd_encoder_mode_set(struct drm_encoder *encoder,
	struct drm_display_mode *mode,
	struct drm_display_mode *adjusted_mode)
	{
	}

	static void imx_pd_encoder_disable(struct drm_encoder *encoder)
	{
	}

	static void imx_pd_encoder_destroy(struct drm_encoder *encoder)
	{
	/* do not free here */
	}

	static struct drm_connector_funcs imx_pd_connector_funcs = {
	.dpms = drm_helper_connector_dpms,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.detect = imx_pd_connector_detect,
	.destroy = imx_pd_connector_destroy,
	};

	static struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
	.get_modes = imx_pd_connector_get_modes,
	.best_encoder = imx_pd_connector_best_encoder,
	.mode_valid = imx_pd_connector_mode_valid,
	};

	static struct drm_encoder_funcs imx_pd_encoder_funcs = {
	.destroy = imx_pd_encoder_destroy,
	};

	static struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
	.dpms = imx_pd_encoder_dpms,
	.mode_fixup = imx_pd_encoder_mode_fixup,
	.prepare = imx_pd_encoder_prepare,
	.commit = imx_pd_encoder_commit,
	.mode_set = imx_pd_encoder_mode_set,
	.disable = imx_pd_encoder_disable,
	};

	static int imx_pd_register(struct imx_parallel_display *imxpd)
	{
	int ret;

	drm_mode_connector_attach_encoder(&imxpd->connector, &imxpd->encoder);

	imxpd->connector.funcs = &imx_pd_connector_funcs;
	imxpd->encoder.funcs = &imx_pd_encoder_funcs;

	imxpd->encoder.encoder_type = DRM_MODE_ENCODER_NONE;
	imxpd->connector.connector_type = DRM_MODE_CONNECTOR_VGA;

	drm_encoder_helper_add(&imxpd->encoder, &imx_pd_encoder_helper_funcs);
	ret = imx_drm_add_encoder(&imxpd->encoder, &imxpd->imx_drm_encoder,
	THIS_MODULE);
	if (ret) {
	dev_err(imxpd->dev, "adding encoder failed with %d\n", ret);
	return ret;
	}

	drm_connector_helper_add(&imxpd->connector,
	&imx_pd_connector_helper_funcs);

	ret = imx_drm_add_connector(&imxpd->connector,
	&imxpd->imx_drm_connector, THIS_MODULE);
	if (ret) {
	imx_drm_remove_encoder(imxpd->imx_drm_encoder);
	dev_err(imxpd->dev, "adding connector failed with %d\n", ret);
	return ret;
	}

	imxpd->connector.encoder = &imxpd->encoder;

	return 0;
	}

	static int __devinit imx_pd_probe(struct platform_device *pdev)
	{
	struct device_node *np = pdev->dev.of_node;
	const u8 *edidp;
	struct imx_parallel_display *imxpd;
	int ret;
	const char *fmt;

	imxpd = devm_kzalloc(&pdev->dev, sizeof(*imxpd), GFP_KERNEL);
	if (!imxpd)
	return -ENOMEM;

	edidp = of_get_property(np, "edid", &imxpd->edid_len);
	if (edidp)
	imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);

	ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
	if (!ret) {
	if (!strcmp(fmt, "rgb24"))
	imxpd->interface_pix_fmt = V4L2_PIX_FMT_RGB24;
	else if (!strcmp(fmt, "rgb565"))
	imxpd->interface_pix_fmt = V4L2_PIX_FMT_RGB565;
	}

	imxpd->dev = &pdev->dev;

	ret = imx_pd_register(imxpd);
	if (ret)
	return ret;

	ret = imx_drm_encoder_add_possible_crtcs(imxpd->imx_drm_encoder, np);

	platform_set_drvdata(pdev, imxpd);

	return 0;
	}

	static int __devexit imx_pd_remove(struct platform_device *pdev)
	{
	struct imx_parallel_display *imxpd = platform_get_drvdata(pdev);
	struct drm_connector *connector = &imxpd->connector;
	struct drm_encoder *encoder = &imxpd->encoder;

	drm_mode_connector_detach_encoder(connector, encoder);

	imx_drm_remove_connector(imxpd->imx_drm_connector);
	imx_drm_remove_encoder(imxpd->imx_drm_encoder);

	return 0;
	}

	static const struct of_device_id imx_pd_dt_ids[] = {
	{ .compatible = "fsl,imx-parallel-display", },
	{ /* sentinel */ }
	};

	static struct platform_driver imx_pd_driver = {
	.probe = imx_pd_probe,
	.remove = __devexit_p(imx_pd_remove),
	.driver = {
	.of_match_table = imx_pd_dt_ids,
	.name = "imx-parallel-display",
	.owner = THIS_MODULE,
	},
	};

	module_platform_driver(imx_pd_driver);

	MODULE_DESCRIPTION("i.MX parallel display driver");
	MODULE_AUTHOR("Sascha Hauer, Pengutronix");
	MODULE_LICENSE("GPL");