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Commit 6d71b923 authored by Archit Taneja's avatar Archit Taneja
Browse files

OMAPDSS: output: Add set/unset device ops for omap_dss_output 



An output entity represented by the struct omap_dss_output connects to a
omap_dss_device entity. Add functions to set or unset an output's device. This
is similar to how managers and devices were connected previously. An output can
connect to a device without being connected to a manager. However, the output
needs to eventually connect to a manager so that the connected panel can be
enabled.

Keep the omap_overlay_manager pointer in omap_dss_device for now to prevent
breaking things. This will be removed later when outputs are supported
completely.

Signed-off-by: default avatarArchit Taneja <archit@ti.com>
parent 81b87f51

drivers/video/omap2/dss/output.c

+67 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 
 */



#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/slab.h>
@@ -24,6 +25,72 @@ 
#include "dss.h"



static LIST_HEAD(output_list);

static DEFINE_MUTEX(output_lock);



int omapdss_output_set_device(struct omap_dss_output *out,

		struct omap_dss_device *dssdev)

{

	int r;



	mutex_lock(&output_lock);



	if (out->device) {

		DSSERR("output already has device %s connected to it\n",

			out->device->name);

		r = -EINVAL;

		goto err;

	}



	if (out->type != dssdev->type) {

		DSSERR("output type and display type don't match\n");

		r = -EINVAL;

		goto err;

	}



	out->device = dssdev;

	dssdev->output = out;



	mutex_unlock(&output_lock);



	return 0;

err:

	mutex_unlock(&output_lock);



	return r;

}

EXPORT_SYMBOL(omapdss_output_set_device);



int omapdss_output_unset_device(struct omap_dss_output *out)

{

	int r;



	mutex_lock(&output_lock);



	if (!out->device) {

		DSSERR("output doesn't have a device connected to it\n");

		r = -EINVAL;

		goto err;

	}



	if (out->device->state != OMAP_DSS_DISPLAY_DISABLED) {

		DSSERR("device %s is not disabled, cannot unset device\n",

				out->device->name);

		r = -EINVAL;

		goto err;

	}



	out->device->output = NULL;

	out->device = NULL;



	mutex_unlock(&output_lock);



	return 0;

err:

	mutex_unlock(&output_lock);



	return r;

}

EXPORT_SYMBOL(omapdss_output_unset_device);



void dss_register_output(struct omap_dss_output *out)

{

include/video/omapdss.h

+4 −0
Original line number Diff line number Diff line
@@ -620,6 +620,7 @@ struct omap_dss_device { 
	enum omap_display_caps caps;



	struct omap_overlay_manager *manager;

	struct omap_dss_output *output;



	enum omap_dss_display_state state;
@@ -731,6 +732,9 @@ int omap_dss_get_num_overlays(void); 
struct omap_overlay *omap_dss_get_overlay(int num);



struct omap_dss_output *omap_dss_get_output(enum omap_dss_output_id id);

int omapdss_output_set_device(struct omap_dss_output *out,

		struct omap_dss_device *dssdev);

int omapdss_output_unset_device(struct omap_dss_output *out);



void omapdss_default_get_resolution(struct omap_dss_device *dssdev,

		u16 *xres, u16 *yres);