hibmc_drm_debugfs.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2// Copyright (c) 2024 Hisilicon Limited.
  3
  4#include <linux/debugfs.h>
  5#include <linux/device.h>
  6#include <linux/seq_file.h>
  7#include <linux/pci.h>
  8
  9#include <drm/drm_drv.h>
 10#include <drm/drm_file.h>
 11#include <drm/drm_debugfs.h>
 12#include <drm/drm_edid.h>
 13
 14#include "hibmc_drm_drv.h"
 15
 16#define MAX_BUF_SIZE 12
 17
 18static ssize_t hibmc_control_write(struct file *file, const char __user *user_buf,
 19				   size_t count, loff_t *ppos)
 20{
 21	struct hibmc_drm_private *priv = file_inode(file)->i_private;
 22	struct hibmc_dp_cbar_cfg *cfg = &priv->dp.cfg;
 23	int ret, idx;
 24	u8 buf[MAX_BUF_SIZE];
 25
 26	if (count >= MAX_BUF_SIZE)
 27		return -EINVAL;
 28
 29	if (copy_from_user(buf, user_buf, count))
 30		return -EFAULT;
 31
 32	buf[count] = '\0';
 33
 34	/* Only 4 parameters is allowed, the ranger are as follow:
 35	 * [0] enable/disable colorbar feature
 36	       0: enable colorbar, 1: disable colorbar
 37	 * [1] the timing source of colorbar displaying
 38	       0: timing follows XDP, 1: internal self timing
 39	 * [2] the movment of colorbar displaying
 40	       0: static colorbar image,
 41	 *     1~255: right shifting a type of color per (1~255)frames
 42	 * [3] the color type of colorbar displaying
 43	       0~9: color bar, white, red, orange,
 44	 *          yellow, green, cyan, bule, pupper, black
 45	 */
 46	if (sscanf(buf, "%hhu %hhu %hhu %u", &cfg->enable, &cfg->self_timing,
 47		   &cfg->dynamic_rate, &cfg->pattern) != 4) {
 48		return -EINVAL;
 49	}
 50
 51	if (cfg->pattern > 9 || cfg->enable > 1 || cfg->self_timing > 1)
 52		return -EINVAL;
 53
 54	ret = drm_dev_enter(&priv->dev, &idx);
 55	if (!ret)
 56		return -ENODEV;
 57
 58	hibmc_dp_set_cbar(&priv->dp, cfg);
 59
 60	drm_dev_exit(idx);
 61
 62	return count;
 63}
 64
 65static int hibmc_dp_dbgfs_show(struct seq_file *m, void *arg)
 66{
 67	struct hibmc_drm_private *priv = m->private;
 68	struct hibmc_dp_cbar_cfg *cfg = &priv->dp.cfg;
 69	int idx;
 70
 71	if (!drm_dev_enter(&priv->dev, &idx))
 72		return -ENODEV;
 73
 74	seq_printf(m, "hibmc dp colorbar cfg: %u %u %u %u\n", cfg->enable, cfg->self_timing,
 75		   cfg->dynamic_rate, cfg->pattern);
 76
 77	drm_dev_exit(idx);
 78
 79	return 0;
 80}
 81
 82static int hibmc_open(struct inode *inode, struct file *filp)
 83{
 84	return single_open(filp, hibmc_dp_dbgfs_show, inode->i_private);
 85}
 86
 87static const struct file_operations hibmc_dbg_fops = {
 88	.owner   = THIS_MODULE,
 89	.write   = hibmc_control_write,
 90	.read    = seq_read,
 91	.open    = hibmc_open,
 92	.llseek  = seq_lseek,
 93	.release = single_release,
 94};
 95
 96void hibmc_debugfs_init(struct drm_connector *connector, struct dentry *root)
 97{
 98	struct drm_device *dev = connector->dev;
 99	struct hibmc_drm_private *priv = to_hibmc_drm_private(dev);
100
101	/* create the file in drm directory, so we don't need to remove manually */
102	debugfs_create_file("colorbar-cfg", 0200,
103			    root, priv, &hibmc_dbg_fops);
104}