// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright 2011 Florian Tobias Schandinat <FlorianSchandinat@gmx.de> */ /* * 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); }