64b70da038
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 43 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190520170858.826676366@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
86 lines
1.7 KiB
C
86 lines
1.7 KiB
C
// 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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