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drm/debugfs: add a "force" file per connector

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Add a file to debugfs for each connector to enable modification of the
"force" connector attribute. This allows connectors to be enabled or
disabled for testing and debugging purposes.

v2: Add stricter value checking and clean up debugfs_entry if file
    creation fails in drm_debugfs_connector_add. (David Herrmann)

Signed-off-by: Thomas Wood <thomas.wood@intel.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Thomas Wood
2014-06-18 17:52:32 +01:00
committed by Daniel Vetter
parent 34ea3d3863
commit 30f6570798
4 changed files with 143 additions and 1 deletions
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114
drivers/gpu/drm/drm_debugfs.c
View File

@@ -237,5 +237,119 @@ int drm_debugfs_cleanup(struct drm_minor *minor)
return 0;
}
static int connector_show(struct seq_file *m, void *data)
{
struct drm_connector *connector = m->private;
const char *status;
switch (connector->force) {
case DRM_FORCE_ON:
status = "on\n";
break;
case DRM_FORCE_ON_DIGITAL:
status = "digital\n";
break;
case DRM_FORCE_OFF:
status = "off\n";
break;
case DRM_FORCE_UNSPECIFIED:
status = "unspecified\n";
break;
default:
return 0;
}
seq_puts(m, status);
return 0;
}
static int connector_open(struct inode *inode, struct file *file)
{
struct drm_connector *dev = inode->i_private;
return single_open(file, connector_show, dev);
}
static ssize_t connector_write(struct file *file, const char __user *ubuf,
size_t len, loff_t *offp)
{
struct seq_file *m = file->private_data;
struct drm_connector *connector = m->private;
char buf[12];
if (len > sizeof(buf) - 1)
return -EINVAL;
if (copy_from_user(buf, ubuf, len))
return -EFAULT;
buf[len] = '\0';
if (!strcmp(buf, "on"))
connector->force = DRM_FORCE_ON;
else if (!strcmp(buf, "digital"))
connector->force = DRM_FORCE_ON_DIGITAL;
else if (!strcmp(buf, "off"))
connector->force = DRM_FORCE_OFF;
else if (!strcmp(buf, "unspecified"))
connector->force = DRM_FORCE_UNSPECIFIED;
else
return -EINVAL;
return len;
}
static const struct file_operations drm_connector_fops = {
.owner = THIS_MODULE,
.open = connector_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = connector_write
};
int drm_debugfs_connector_add(struct drm_connector *connector)
{
struct drm_minor *minor = connector->dev->primary;
struct dentry *root, *ent;
if (!minor->debugfs_root)
return -1;
root = debugfs_create_dir(connector->name, minor->debugfs_root);
if (!root)
return -ENOMEM;
connector->debugfs_entry = root;
/* force */
ent = debugfs_create_file("force", S_IRUGO | S_IWUSR, root, connector,
&drm_connector_fops);
if (!ent)
goto error;
return 0;
error:
debugfs_remove_recursive(connector->debugfs_entry);
connector->debugfs_entry = NULL;
return -ENOMEM;
}
void drm_debugfs_connector_remove(struct drm_connector *connector)
{
if (!connector->debugfs_entry)
return;
debugfs_remove_recursive(connector->debugfs_entry);
connector->debugfs_entry = NULL;
}
#endif /* CONFIG_DEBUG_FS */