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staging: udlfb: support for writing backup EDID to sysfs file 

Support writing default/backup edid via /sys/class/graphics/fb?/edid

Writing a backup edid blob to the 'edid' file will cause udlfb to
attempt to re-read the edid from hardware.
If we still don't have a good edid, it will use the backup edid instead.
The intent is to 1) enable user-supplied edid
2) enable udev rules to backup the last known good edid
for a device, and then provide that edid as a backup for all future starts

Signed-off-by: Bernie Thompson <bernie@plugable.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Bernie Thompson 2010-09-05 16:35:31 -07:00 committed by Greg Kroah-Hartman
parent 1572f91cff
commit 8ef8cc4fca
1 changed files with 26 additions and 2 deletions
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28
drivers/staging/udlfb/udlfb.c
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@ -1306,6 +1306,29 @@ static ssize_t edid_show(
return count;
}
static ssize_t edid_store(
struct file *filp,
struct kobject *kobj, struct bin_attribute *a,
char *src, loff_t src_off, size_t src_size) {
struct device *fbdev = container_of(kobj, struct device, kobj);
struct fb_info *fb_info = dev_get_drvdata(fbdev);
struct dlfb_data *dev = fb_info->par;
/* We only support write of entire EDID at once, no offset*/
if ((src_size < MIN_EDID_SIZE) ||
(src_size > MAX_EDID_SIZE) ||
(src_off != 0))
return 0;
dlfb_setup_modes(dev, fb_info, src, src_size);
if (dev->edid && (memcmp(src, dev->edid, src_size) == 0)) {
dl_info("sysfs written EDID is new default\n");
dlfb_ops_set_par(fb_info);
return src_size;
} else
return 0;
}
static ssize_t metrics_reset_store(struct device *fbdev,
struct device_attribute *attr,
@ -1348,9 +1371,10 @@ static ssize_t use_defio_store(struct device *fbdev,
static struct bin_attribute edid_attr = {
.attr.name = "edid",
.attr.mode = 0444,
.size = 128,
.attr.mode = 0666,
.size = MAX_EDID_SIZE,
.read = edid_show,
.write = edid_store
};
static struct device_attribute fb_device_attrs[] = {