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Commit ba2eac9e authored by Tomi Valkeinen's avatar Tomi Valkeinen
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OMAP: DSS2: add panel-dvi driver 



We have currently panel-generic-dpi driver, which is a combined driver
for dummy panels and also for DVI output.

The aim is to split the panel-generic-dpi into two, one for fixed size
dummy panels connected via DPI, and the other (this) for variable
resolution output which supports DDC channel (in practice a DVI framer
chip connected to DPI output).

Original i2c code by: Ricardo Salveti de Araujo
<ricardo.salveti@canonical.com>

Signed-off-by: default avatarTomi Valkeinen <tomi.valkeinen@ti.com>
parent 759593ff

drivers/video/omap2/displays/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -10,6 +10,13 @@ config PANEL_GENERIC_DPI 
	  Supports LCD Panel used in TI SDP3430 and EVM boards,

	  OMAP3517 EVM boards and CM-T35.



config PANEL_DVI

	tristate "DVI output"

	depends on OMAP2_DSS_DPI

	help

	  Driver for external monitors, connected via DVI. The driver uses i2c

	  to read EDID information from the monitor.



config PANEL_LGPHILIPS_LB035Q02

	tristate "LG.Philips LB035Q02 LCD Panel"

	depends on OMAP2_DSS_DPI && SPI

drivers/video/omap2/displays/Makefile

+1 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_PANEL_GENERIC_DPI) += panel-generic-dpi.o

obj-$(CONFIG_PANEL_DVI) += panel-dvi.o

obj-$(CONFIG_PANEL_LGPHILIPS_LB035Q02) += panel-lgphilips-lb035q02.o

obj-$(CONFIG_PANEL_SHARP_LS037V7DW01) += panel-sharp-ls037v7dw01.o

obj-$(CONFIG_PANEL_NEC_NL8048HL11_01B) += panel-nec-nl8048hl11-01b.o

drivers/video/omap2/displays/panel-dvi.c

0 → 100644
+363 −0
Original line number Diff line number Diff line 
/*

 * DVI output support

 *

 * Copyright (C) 2011 Texas Instruments Inc

 * 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.

 *

 * 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, see <http://www.gnu.org/licenses/>.

 */



#include <linux/module.h>

#include <linux/slab.h>

#include <video/omapdss.h>

#include <linux/i2c.h>

#include <drm/drm_edid.h>



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



static const struct omap_video_timings panel_dvi_default_timings = {

	.x_res		= 640,

	.y_res		= 480,



	.pixel_clock	= 23500,



	.hfp		= 48,

	.hsw		= 32,

	.hbp		= 80,



	.vfp		= 3,

	.vsw		= 4,

	.vbp		= 7,

};



struct panel_drv_data {

	struct omap_dss_device *dssdev;



	struct mutex lock;

};



static inline struct panel_dvi_platform_data

*get_pdata(const struct omap_dss_device *dssdev)

{

	return dssdev->data;

}



static int panel_dvi_power_on(struct omap_dss_device *dssdev)

{

	struct panel_dvi_platform_data *pdata = get_pdata(dssdev);

	int r;



	if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)

		return 0;



	r = omapdss_dpi_display_enable(dssdev);

	if (r)

		goto err0;



	if (pdata->platform_enable) {

		r = pdata->platform_enable(dssdev);

		if (r)

			goto err1;

	}



	return 0;

err1:

	omapdss_dpi_display_disable(dssdev);

err0:

	return r;

}



static void panel_dvi_power_off(struct omap_dss_device *dssdev)

{

	struct panel_dvi_platform_data *pdata = get_pdata(dssdev);



	if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)

		return;



	if (pdata->platform_disable)

		pdata->platform_disable(dssdev);



	omapdss_dpi_display_disable(dssdev);

}



static int panel_dvi_probe(struct omap_dss_device *dssdev)

{

	struct panel_drv_data *ddata;



	ddata = kzalloc(sizeof(*ddata), GFP_KERNEL);

	if (!ddata)

		return -ENOMEM;



	dssdev->panel.timings = panel_dvi_default_timings;

	dssdev->panel.config = OMAP_DSS_LCD_TFT;



	ddata->dssdev = dssdev;

	mutex_init(&ddata->lock);



	dev_set_drvdata(&dssdev->dev, ddata);



	return 0;

}



static void __exit panel_dvi_remove(struct omap_dss_device *dssdev)

{

	struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);



	mutex_lock(&ddata->lock);



	dev_set_drvdata(&dssdev->dev, NULL);



	mutex_unlock(&ddata->lock);



	kfree(ddata);

}



static int panel_dvi_enable(struct omap_dss_device *dssdev)

{

	struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);

	int r;



	mutex_lock(&ddata->lock);



	r = panel_dvi_power_on(dssdev);

	if (r == 0)

		dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;



	mutex_unlock(&ddata->lock);



	return r;

}



static void panel_dvi_disable(struct omap_dss_device *dssdev)

{

	struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);



	mutex_lock(&ddata->lock);



	panel_dvi_power_off(dssdev);



	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;



	mutex_unlock(&ddata->lock);

}



static int panel_dvi_suspend(struct omap_dss_device *dssdev)

{

	struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);



	mutex_lock(&ddata->lock);



	panel_dvi_power_off(dssdev);



	dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;



	mutex_unlock(&ddata->lock);



	return 0;

}



static int panel_dvi_resume(struct omap_dss_device *dssdev)

{

	struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);

	int r;



	mutex_lock(&ddata->lock);



	r = panel_dvi_power_on(dssdev);

	if (r == 0)

		dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;



	mutex_unlock(&ddata->lock);



	return r;

}



static void panel_dvi_set_timings(struct omap_dss_device *dssdev,

		struct omap_video_timings *timings)

{

	struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);



	mutex_lock(&ddata->lock);

	dpi_set_timings(dssdev, timings);

	mutex_unlock(&ddata->lock);

}



static void panel_dvi_get_timings(struct omap_dss_device *dssdev,

		struct omap_video_timings *timings)

{

	struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);



	mutex_lock(&ddata->lock);

	*timings = dssdev->panel.timings;

	mutex_unlock(&ddata->lock);

}



static int panel_dvi_check_timings(struct omap_dss_device *dssdev,

		struct omap_video_timings *timings)

{

	struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);

	int r;



	mutex_lock(&ddata->lock);

	r = dpi_check_timings(dssdev, timings);

	mutex_unlock(&ddata->lock);



	return r;

}





static int panel_dvi_ddc_read(struct i2c_adapter *adapter,

		unsigned char *buf, u16 count, u8 offset)

{

	int r, retries;



	for (retries = 3; retries > 0; retries--) {

		struct i2c_msg msgs[] = {

			{

				.addr   = DDC_ADDR,

				.flags  = 0,

				.len    = 1,

				.buf    = &offset,

			}, {

				.addr   = DDC_ADDR,

				.flags  = I2C_M_RD,

				.len    = count,

				.buf    = buf,

			}

		};



		r = i2c_transfer(adapter, msgs, 2);

		if (r == 2)

			return 0;



		if (r != -EAGAIN)

			break;

	}



	return r < 0 ? r : -EIO;

}



static int panel_dvi_read_edid(struct omap_dss_device *dssdev,

		u8 *edid, int len)

{

	struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);

	struct panel_dvi_platform_data *pdata = get_pdata(dssdev);

	struct i2c_adapter *adapter;

	int r, l, bytes_read;



	mutex_lock(&ddata->lock);



	if (pdata->i2c_bus_num == 0) {

		r = -ENODEV;

		goto err;

	}



	adapter = i2c_get_adapter(pdata->i2c_bus_num);

	if (!adapter) {

		dev_err(&dssdev->dev, "Failed to get I2C adapter, bus %d\n",

				pdata->i2c_bus_num);

		r = -EINVAL;

		goto err;

	}



	l = min(EDID_LENGTH, len);

	r = panel_dvi_ddc_read(adapter, edid, l, 0);

	if (r)

		goto err;



	bytes_read = l;



	/* if there are extensions, read second block */

	if (len > EDID_LENGTH && edid[0x7e] > 0) {

		l = min(EDID_LENGTH, len - EDID_LENGTH);



		r = panel_dvi_ddc_read(adapter, edid + EDID_LENGTH,

				l, EDID_LENGTH);

		if (r)

			goto err;



		bytes_read += l;

	}



	mutex_unlock(&ddata->lock);



	return bytes_read;



err:

	mutex_unlock(&ddata->lock);

	return r;

}



static bool panel_dvi_detect(struct omap_dss_device *dssdev)

{

	struct panel_drv_data *ddata = dev_get_drvdata(&dssdev->dev);

	struct panel_dvi_platform_data *pdata = get_pdata(dssdev);

	struct i2c_adapter *adapter;

	unsigned char out;

	int r;



	mutex_lock(&ddata->lock);



	if (pdata->i2c_bus_num == 0)

		goto out;



	adapter = i2c_get_adapter(pdata->i2c_bus_num);

	if (!adapter)

		goto out;



	r = panel_dvi_ddc_read(adapter, &out, 1, 0);



	mutex_unlock(&ddata->lock);



	return r == 0;



out:

	mutex_unlock(&ddata->lock);

	return true;

}



static struct omap_dss_driver panel_dvi_driver = {

	.probe		= panel_dvi_probe,

	.remove		= __exit_p(panel_dvi_remove),



	.enable		= panel_dvi_enable,

	.disable	= panel_dvi_disable,

	.suspend	= panel_dvi_suspend,

	.resume		= panel_dvi_resume,



	.set_timings	= panel_dvi_set_timings,

	.get_timings	= panel_dvi_get_timings,

	.check_timings	= panel_dvi_check_timings,



	.read_edid	= panel_dvi_read_edid,

	.detect		= panel_dvi_detect,



	.driver         = {

		.name   = "dvi",

		.owner  = THIS_MODULE,

	},

};



static int __init panel_dvi_init(void)

{

	return omap_dss_register_driver(&panel_dvi_driver);

}



static void __exit panel_dvi_exit(void)

{

	omap_dss_unregister_driver(&panel_dvi_driver);

}



module_init(panel_dvi_init);

module_exit(panel_dvi_exit);

MODULE_LICENSE("GPL");

include/video/omap-panel-dvi.h

0 → 100644
+37 −0
Original line number Diff line number Diff line 
/*

 * Header for DVI output driver

 *

 * Copyright (C) 2011 Texas Instruments Inc

 * 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.

 *

 * 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, see <http://www.gnu.org/licenses/>.

 */



#ifndef __OMAP_PANEL_DVI_H

#define __OMAP_PANEL_DVI_H



struct omap_dss_device;



/**

 * struct panel_dvi_platform_data - panel driver configuration data

 * @platform_enable: platform specific panel enable function

 * @platform_disable: platform specific panel disable function

 * @i2c_bus_num: i2c bus id for the panel

 */

struct panel_dvi_platform_data {

	int (*platform_enable)(struct omap_dss_device *dssdev);

	void (*platform_disable)(struct omap_dss_device *dssdev);

	u16 i2c_bus_num;

};



#endif /* __OMAP_PANEL_DVI_H */