| /* -*- mode: c; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */ |
| /* vi: set ts=8 sw=8 sts=8: */ |
| /*************************************************************************/ /*! |
| @File |
| @Codingstyle LinuxKernel |
| @Copyright Copyright (c) Imagination Technologies Ltd. All Rights Reserved |
| @License Dual MIT/GPLv2 |
| |
| The contents of this file are subject to the MIT license as set out below. |
| |
| Permission is hereby granted, free of charge, to any person obtaining a copy |
| of this software and associated documentation files (the "Software"), to deal |
| in the Software without restriction, including without limitation the rights |
| to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| copies of the Software, and to permit persons to whom the Software is |
| furnished to do so, subject to the following conditions: |
| |
| The above copyright notice and this permission notice shall be included in |
| all copies or substantial portions of the Software. |
| |
| Alternatively, the contents of this file may be used under the terms of |
| the GNU General Public License Version 2 ("GPL") in which case the provisions |
| of GPL are applicable instead of those above. |
| |
| If you wish to allow use of your version of this file only under the terms of |
| GPL, and not to allow others to use your version of this file under the terms |
| of the MIT license, indicate your decision by deleting the provisions above |
| and replace them with the notice and other provisions required by GPL as set |
| out in the file called "GPL-COPYING" included in this distribution. If you do |
| not delete the provisions above, a recipient may use your version of this file |
| under the terms of either the MIT license or GPL. |
| |
| This License is also included in this distribution in the file called |
| "MIT-COPYING". |
| |
| EXCEPT AS OTHERWISE STATED IN A NEGOTIATED AGREEMENT: (A) THE SOFTWARE IS |
| PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING |
| BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR |
| PURPOSE AND NONINFRINGEMENT; AND (B) IN NO EVENT SHALL THE AUTHORS OR |
| COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER |
| IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| */ /**************************************************************************/ |
| |
| #include <linux/debugfs.h> |
| |
| #include "drm_pdp_drv.h" |
| |
| #define PDP_DEBUGFS_DISPLAY_ENABLED "display_enabled" |
| |
| static int display_enabled_open(struct inode *inode, struct file *file) |
| { |
| file->private_data = inode->i_private; |
| |
| return 0; |
| } |
| |
| static ssize_t display_enabled_read(struct file *file, |
| char __user *user_buffer, |
| size_t count, |
| loff_t *position_ptr) |
| { |
| struct drm_device *dev = file->private_data; |
| struct pdp_drm_private *dev_priv = dev->dev_private; |
| loff_t position = *position_ptr; |
| char buffer[] = "N\n"; |
| size_t buffer_size = ARRAY_SIZE(buffer); |
| int err; |
| |
| if (position < 0) |
| return -EINVAL; |
| else if (position >= buffer_size || count == 0) |
| return 0; |
| |
| if (dev_priv->display_enabled) |
| buffer[0] = 'Y'; |
| |
| if (count > buffer_size - position) |
| count = buffer_size - position; |
| |
| err = copy_to_user(user_buffer, &buffer[position], count); |
| if (err) |
| return -EFAULT; |
| |
| *position_ptr = position + count; |
| |
| return count; |
| } |
| |
| static ssize_t display_enabled_write(struct file *file, |
| const char __user *user_buffer, |
| size_t count, |
| loff_t *position) |
| { |
| struct drm_device *dev = file->private_data; |
| struct pdp_drm_private *dev_priv = dev->dev_private; |
| char buffer[3]; |
| int err; |
| |
| count = min(count, ARRAY_SIZE(buffer) - 1); |
| |
| err = copy_from_user(buffer, user_buffer, count); |
| if (err) |
| return -EFAULT; |
| buffer[count] = '\0'; |
| |
| if (!strtobool(buffer, &dev_priv->display_enabled) && dev_priv->crtc) |
| pdp_crtc_set_plane_enabled(dev_priv->crtc, dev_priv->display_enabled); |
| |
| return count; |
| } |
| |
| static const struct file_operations pdp_display_enabled_fops = { |
| .owner = THIS_MODULE, |
| .open = display_enabled_open, |
| .read = display_enabled_read, |
| .write = display_enabled_write, |
| .llseek = default_llseek, |
| }; |
| |
| static int pdp_debugfs_create(struct drm_minor *minor, const char *name, |
| umode_t mode, const struct file_operations *fops) |
| { |
| struct drm_info_node *node; |
| |
| /* |
| * We can't get access to our driver private data when this function is |
| * called so we fake up a node so that we can clean up entries later on. |
| */ |
| node = kzalloc(sizeof(*node), GFP_KERNEL); |
| if (!node) |
| return -ENOMEM; |
| |
| node->dent = debugfs_create_file(name, mode, minor->debugfs_root, |
| minor->dev, fops); |
| if (!node->dent) { |
| kfree(node); |
| return -ENOMEM; |
| } |
| |
| node->minor = minor; |
| node->info_ent = (void *) fops; |
| |
| mutex_lock(&minor->debugfs_lock); |
| list_add(&node->list, &minor->debugfs_list); |
| mutex_unlock(&minor->debugfs_lock); |
| |
| return 0; |
| } |
| |
| int pdp_debugfs_init(struct drm_minor *minor) |
| { |
| int err; |
| |
| err = pdp_debugfs_create(minor, PDP_DEBUGFS_DISPLAY_ENABLED, |
| 0100644, |
| &pdp_display_enabled_fops); |
| if (err) { |
| DRM_INFO("failed to create '%s' debugfs entry\n", |
| PDP_DEBUGFS_DISPLAY_ENABLED); |
| } |
| |
| return err; |
| } |
| |
| #if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 12, 0)) |
| void pdp_debugfs_cleanup(struct drm_minor *minor) |
| { |
| drm_debugfs_remove_files((struct drm_info_list *) &pdp_display_enabled_fops, |
| 1, minor); |
| } |
| #endif |