86 lines
1.7 KiB
C
86 lines
1.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright 2011 Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
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*/
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/*
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* generic EDID driver
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*/
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#include <linux/slab.h>
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#include <linux/fb.h>
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#include "via_aux.h"
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#include "../edid.h"
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static const char *name = "EDID";
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static void query_edid(struct via_aux_drv *drv)
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{
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struct fb_monspecs *spec = drv->data;
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unsigned char edid[EDID_LENGTH];
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bool valid = false;
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if (spec) {
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fb_destroy_modedb(spec->modedb);
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} else {
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spec = kmalloc(sizeof(*spec), GFP_KERNEL);
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if (!spec)
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return;
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}
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spec->version = spec->revision = 0;
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if (via_aux_read(drv, 0x00, edid, EDID_LENGTH)) {
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fb_edid_to_monspecs(edid, spec);
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valid = spec->version || spec->revision;
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}
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if (!valid) {
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kfree(spec);
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spec = NULL;
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} else
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printk(KERN_DEBUG "EDID: %s %s\n", spec->manufacturer, spec->monitor);
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drv->data = spec;
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}
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static const struct fb_videomode *get_preferred_mode(struct via_aux_drv *drv)
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{
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struct fb_monspecs *spec = drv->data;
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int i;
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if (!spec || !spec->modedb || !(spec->misc & FB_MISC_1ST_DETAIL))
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return NULL;
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for (i = 0; i < spec->modedb_len; i++) {
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if (spec->modedb[i].flag & FB_MODE_IS_FIRST &&
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spec->modedb[i].flag & FB_MODE_IS_DETAILED)
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return &spec->modedb[i];
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}
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return NULL;
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}
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static void cleanup(struct via_aux_drv *drv)
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{
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struct fb_monspecs *spec = drv->data;
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if (spec)
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fb_destroy_modedb(spec->modedb);
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}
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void via_aux_edid_probe(struct via_aux_bus *bus)
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{
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struct via_aux_drv drv = {
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.bus = bus,
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.addr = 0x50,
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.name = name,
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.cleanup = cleanup,
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.get_preferred_mode = get_preferred_mode};
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query_edid(&drv);
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/* as EDID devices can be connected/disconnected just add the driver */
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via_aux_add(&drv);
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}
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