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>
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1 changed files with 26 additions and 2 deletions
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@ -1306,6 +1306,29 @@ static ssize_t edid_show(
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return count;
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return count;
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}
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}
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static ssize_t edid_store(
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struct file *filp,
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struct kobject *kobj, struct bin_attribute *a,
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char *src, loff_t src_off, size_t src_size) {
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struct device *fbdev = container_of(kobj, struct device, kobj);
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struct fb_info *fb_info = dev_get_drvdata(fbdev);
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struct dlfb_data *dev = fb_info->par;
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/* We only support write of entire EDID at once, no offset*/
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if ((src_size < MIN_EDID_SIZE) ||
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(src_size > MAX_EDID_SIZE) ||
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(src_off != 0))
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return 0;
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dlfb_setup_modes(dev, fb_info, src, src_size);
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if (dev->edid && (memcmp(src, dev->edid, src_size) == 0)) {
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dl_info("sysfs written EDID is new default\n");
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dlfb_ops_set_par(fb_info);
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return src_size;
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} else
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return 0;
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}
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static ssize_t metrics_reset_store(struct device *fbdev,
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static ssize_t metrics_reset_store(struct device *fbdev,
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struct device_attribute *attr,
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struct device_attribute *attr,
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@ -1348,9 +1371,10 @@ static ssize_t use_defio_store(struct device *fbdev,
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static struct bin_attribute edid_attr = {
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static struct bin_attribute edid_attr = {
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.attr.name = "edid",
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.attr.name = "edid",
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.attr.mode = 0444,
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.attr.mode = 0666,
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.size = 128,
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.size = MAX_EDID_SIZE,
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.read = edid_show,
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.read = edid_show,
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.write = edid_store
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};
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};
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static struct device_attribute fb_device_attrs[] = {
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static struct device_attribute fb_device_attrs[] = {
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