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
hibmc_control_write(struct file * file,const char __user * user_buf,size_t count,loff_t * ppos)18 static 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
hibmc_dp_dbgfs_show(struct seq_file * m,void * arg)65 static 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
hibmc_open(struct inode * inode,struct file * filp)82 static int hibmc_open(struct inode *inode, struct file *filp)
83 {
84 return single_open(filp, hibmc_dp_dbgfs_show, inode->i_private);
85 }
86
87 static 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
hibmc_debugfs_init(struct drm_connector * connector,struct dentry * root)96 void 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 }
105