1// SPDX-License-Identifier: GPL-2.0
2/*
3 * UCSI debugfs interface
4 *
5 * Copyright (C) 2023 Intel Corporation
6 *
7 * Authors: Rajaram Regupathy <rajaram.regupathy@intel.com>
8 *	    Gopal Saranya <saranya.gopal@intel.com>
9 */
10#include <linux/debugfs.h>
11#include <linux/slab.h>
12#include <linux/string.h>
13#include <linux/types.h>
14#include <linux/usb.h>
15
16#include <asm/errno.h>
17
18#include "ucsi.h"
19
20static struct dentry *ucsi_debugfs_root;
21
22static int ucsi_cmd(void *data, u64 val)
23{
24	struct ucsi *ucsi = data;
25	int ret;
26
27	memset(&ucsi->debugfs->response, 0, sizeof(ucsi->debugfs->response));
28	ucsi->debugfs->status = 0;
29
30	switch (UCSI_COMMAND(val)) {
31	case UCSI_SET_UOM:
32	case UCSI_SET_UOR:
33	case UCSI_SET_PDR:
34	case UCSI_CONNECTOR_RESET:
35		ret = ucsi_send_command(ucsi, val, NULL, 0);
36		break;
37	case UCSI_GET_CAPABILITY:
38	case UCSI_GET_CONNECTOR_CAPABILITY:
39	case UCSI_GET_ALTERNATE_MODES:
40	case UCSI_GET_CURRENT_CAM:
41	case UCSI_GET_PDOS:
42	case UCSI_GET_CABLE_PROPERTY:
43	case UCSI_GET_CONNECTOR_STATUS:
44		ret = ucsi_send_command(ucsi, val,
45					&ucsi->debugfs->response,
46					sizeof(ucsi->debugfs->response));
47		break;
48	default:
49		ret = -EOPNOTSUPP;
50	}
51
52	if (ret < 0) {
53		ucsi->debugfs->status = ret;
54		return ret;
55	}
56
57	return 0;
58}
59DEFINE_DEBUGFS_ATTRIBUTE(ucsi_cmd_fops, NULL, ucsi_cmd, "0x%llx\n");
60
61static int ucsi_resp_show(struct seq_file *s, void *not_used)
62{
63	struct ucsi *ucsi = s->private;
64
65	if (ucsi->debugfs->status)
66		return ucsi->debugfs->status;
67
68	seq_printf(s, "0x%016llx%016llx\n", ucsi->debugfs->response.high,
69		   ucsi->debugfs->response.low);
70	return 0;
71}
72DEFINE_SHOW_ATTRIBUTE(ucsi_resp);
73
74void ucsi_debugfs_register(struct ucsi *ucsi)
75{
76	ucsi->debugfs = kzalloc(sizeof(*ucsi->debugfs), GFP_KERNEL);
77	if (!ucsi->debugfs)
78		return;
79
80	ucsi->debugfs->dentry = debugfs_create_dir(dev_name(ucsi->dev), ucsi_debugfs_root);
81	debugfs_create_file("command", 0200, ucsi->debugfs->dentry, ucsi, &ucsi_cmd_fops);
82	debugfs_create_file("response", 0400, ucsi->debugfs->dentry, ucsi, &ucsi_resp_fops);
83}
84
85void ucsi_debugfs_unregister(struct ucsi *ucsi)
86{
87	if (IS_ERR_OR_NULL(ucsi) || !ucsi->debugfs)
88		return;
89
90	debugfs_remove_recursive(ucsi->debugfs->dentry);
91	kfree(ucsi->debugfs);
92}
93
94void ucsi_debugfs_init(void)
95{
96	ucsi_debugfs_root = debugfs_create_dir("ucsi", usb_debug_root);
97}
98
99void ucsi_debugfs_exit(void)
100{
101	debugfs_remove(ucsi_debugfs_root);
102}
103