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authorThomas Wood <thomas.wood@intel.com>2014-06-18 20:52:32 +0400
committerDaniel Vetter <daniel.vetter@ffwll.ch>2014-06-19 10:56:01 +0400
commit30f6570798f6c897df4f1f2c676d803728bfec27 (patch)
tree2ff3e99b8286b75b0cac0a2c07cee9da9c6634bf /drivers/gpu/drm/drm_debugfs.c
parent34ea3d386347cd6de4c2fa2491dd85c9e753e7e4 (diff)
downloadlinux-30f6570798f6c897df4f1f2c676d803728bfec27.tar.xz
drm/debugfs: add a "force" file per connector
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>
Diffstat (limited to 'drivers/gpu/drm/drm_debugfs.c')
-rw-r--r--drivers/gpu/drm/drm_debugfs.c114
1 files changed, 114 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c
index b4b51d46f339..8ab3f3e38643 100644
--- a/drivers/gpu/drm/drm_debugfs.c
+++ b/drivers/gpu/drm/drm_debugfs.c
@@ -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 */