[PATCH 2/2] video: some framebuffer such as efi does support enable/disable
Jean-Christophe PLAGNIOL-VILLARD
plagnioj at jcrosoft.com
Thu Mar 9 01:57:21 PST 2017
so allow them to do not pass this function via fbops
and indicate they are always on.
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
---
drivers/video/fb.c | 29 ++++++++++++++++++++++++-----
1 file changed, 24 insertions(+), 5 deletions(-)
diff --git a/drivers/video/fb.c b/drivers/video/fb.c
index 6b88f2df9..63a818eb2 100644
--- a/drivers/video/fb.c
+++ b/drivers/video/fb.c
@@ -19,10 +19,12 @@ static int fb_ioctl(struct cdev* cdev, int req, void *data)
*fb = info;
break;
case FBIO_ENABLE:
- info->fbops->fb_enable(info);
+ if (info->fbops->fb_enable)
+ info->fbops->fb_enable(info);
break;
case FBIO_DISABLE:
- info->fbops->fb_disable(info);
+ if (info->fbops->fb_disable)
+ info->fbops->fb_disable(info);
break;
default:
return -ENOSYS;
@@ -94,7 +96,8 @@ int fb_enable(struct fb_info *info)
if (ret)
return ret;
- info->fbops->fb_enable(info);
+ if (info->fbops->fb_enable)
+ info->fbops->fb_enable(info);
info->enabled = true;
@@ -106,7 +109,8 @@ int fb_disable(struct fb_info *info)
if (!info->enabled)
return 0;
- info->fbops->fb_disable(info);
+ if (info->fbops->fb_disable)
+ info->fbops->fb_disable(info);
fb_release_shadowfb(info);
@@ -266,6 +270,8 @@ static int fb_set_shadowfb(struct param_d *p, void *priv)
return fb_alloc_shadowfb(info);
}
+struct fb_ops dummy_fbops;
+
int register_framebuffer(struct fb_info *info)
{
int id = get_free_deviceid("fb");
@@ -273,6 +279,16 @@ int register_framebuffer(struct fb_info *info)
int ret, num_modes, i;
const char **names;
+ if (!info->p_enable) {
+ if (!info->fbops)
+ return -EINVAL;
+ if (!info->fbops->fb_enable && !info->fbops->fb_disable)
+ return -EINVAL;
+ } else {
+ if (!info->fbops)
+ info->fbops = &dummy_fbops;
+ }
+
dev = &info->dev;
/*
@@ -308,7 +324,10 @@ int register_framebuffer(struct fb_info *info)
if (ret)
goto err_free;
- dev_add_param_bool(dev, "enable", fb_enable_set, NULL,
+ if (info->p_enable)
+ dev_add_param_int_ro(dev, "enable", info->p_enable, "%d");
+ else
+ dev_add_param_bool(dev, "enable", fb_enable_set, NULL,
&info->p_enable, info);
if (IS_ENABLED(CONFIG_DRIVER_VIDEO_EDID))
--
2.11.0
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