[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / video / via / via_aux_edid.c

/*
 * Copyright 2011 Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
 *
 * 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, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; 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.,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
/*
 * generic EDID driver
 */

#include <linux/slab.h>
#include <linux/fb.h>
#include "via_aux.h"
#include "../edid.h"


static const char *name = "EDID";


static void query_edid(struct via_aux_drv *drv)
{
	struct fb_monspecs *spec = drv->data;
	unsigned char edid[EDID_LENGTH];
	bool valid = false;

	if (spec) {
		fb_destroy_modedb(spec->modedb);
	} else {
		spec = kmalloc(sizeof(*spec), GFP_KERNEL);
		if (!spec)
			return;
	}

	spec->version = spec->revision = 0;
	if (via_aux_read(drv, 0x00, edid, EDID_LENGTH)) {
		fb_edid_to_monspecs(edid, spec);
		valid = spec->version || spec->revision;
	}

	if (!valid) {
		kfree(spec);
		spec = NULL;
	} else
		printk(KERN_DEBUG "EDID: %s %s\n", spec->manufacturer, spec->monitor);

	drv->data = spec;
}

static const struct fb_videomode *get_preferred_mode(struct via_aux_drv *drv)
{
	struct fb_monspecs *spec = drv->data;
	int i;

	if (!spec || !spec->modedb || !(spec->misc & FB_MISC_1ST_DETAIL))
		return NULL;

	for (i = 0; i < spec->modedb_len; i++) {
		if (spec->modedb[i].flag & FB_MODE_IS_FIRST &&
			spec->modedb[i].flag & FB_MODE_IS_DETAILED)
			return &spec->modedb[i];
	}

	return NULL;
}

static void cleanup(struct via_aux_drv *drv)
{
	struct fb_monspecs *spec = drv->data;

	if (spec)
		fb_destroy_modedb(spec->modedb);
}

void via_aux_edid_probe(struct via_aux_bus *bus)
{
	struct via_aux_drv drv = {
		.bus	=	bus,
		.addr	=	0x50,
		.name	=	name,
		.cleanup	=	cleanup,
		.get_preferred_mode	=	get_preferred_mode};

	query_edid(&drv);

	/* as EDID devices can be connected/disconnected just add the driver */
	via_aux_add(&drv);
}
Commit	Line	Data
e7589271 FTS	1	/*
	2	* Copyright 2011 Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public
	6	* License as published by the Free Software Foundation;
	7	* either version 2, or (at your option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; without even
	11	* the implied warranty of MERCHANTABILITY or FITNESS FOR
	12	* A PARTICULAR PURPOSE.See the GNU General Public License
	13	* for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc.,
	18	* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	19	*/
	20	/*
	21	* generic EDID driver
	22	*/
	23
	24	#include <linux/slab.h>
5dc5f618	25	#include <linux/fb.h>
e7589271	26	#include "via_aux.h"
5dc5f618	27	#include "../edid.h"
e7589271 FTS	28
	29
	30	static const char *name = "EDID";
	31
	32
5dc5f618 FTS	33	static void query_edid(struct via_aux_drv *drv)
	34	{
	35	struct fb_monspecs *spec = drv->data;
	36	unsigned char edid[EDID_LENGTH];
	37	bool valid = false;
	38
c572c8bb	39	if (spec) {
5dc5f618	40	fb_destroy_modedb(spec->modedb);
c572c8bb	41	} else {
5dc5f618	42	spec = kmalloc(sizeof(*spec), GFP_KERNEL);
c572c8bb DC	43	if (!spec)
	44	return;
	45	}
5dc5f618 FTS	46
	47	spec->version = spec->revision = 0;
	48	if (via_aux_read(drv, 0x00, edid, EDID_LENGTH)) {
	49	fb_edid_to_monspecs(edid, spec);
	50	valid = spec->version \|\| spec->revision;
	51	}
	52
	53	if (!valid) {
	54	kfree(spec);
	55	spec = NULL;
	56	} else
	57	printk(KERN_DEBUG "EDID: %s %s\n", spec->manufacturer, spec->monitor);
	58
	59	drv->data = spec;
	60	}
	61
	62	static const struct fb_videomode get_preferred_mode(struct via_aux_drv drv)
	63	{
	64	struct fb_monspecs *spec = drv->data;
	65	int i;
	66
	67	if (!spec \|\| !spec->modedb \|\| !(spec->misc & FB_MISC_1ST_DETAIL))
	68	return NULL;
	69
	70	for (i = 0; i < spec->modedb_len; i++) {
	71	if (spec->modedb[i].flag & FB_MODE_IS_FIRST &&
	72	spec->modedb[i].flag & FB_MODE_IS_DETAILED)
	73	return &spec->modedb[i];
	74	}
	75
	76	return NULL;
	77	}
	78
	79	static void cleanup(struct via_aux_drv *drv)
	80	{
	81	struct fb_monspecs *spec = drv->data;
	82
	83	if (spec)
	84	fb_destroy_modedb(spec->modedb);
	85	}
	86
e7589271 FTS	87	void via_aux_edid_probe(struct via_aux_bus *bus)
	88	{
	89	struct via_aux_drv drv = {
	90	.bus = bus,
	91	.addr = 0x50,
5dc5f618 FTS	92	.name = name,
	93	.cleanup = cleanup,
	94	.get_preferred_mode = get_preferred_mode};
	95
	96	query_edid(&drv);
e7589271 FTS	97
	98	/* as EDID devices can be connected/disconnected just add the driver */
	99	via_aux_add(&drv);
	100	}