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 20 static struct dentry *ucsi_debugfs_root; 21 22 static 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 } 59 DEFINE_DEBUGFS_ATTRIBUTE(ucsi_cmd_fops, NULL, ucsi_cmd, "0x%llx\n"); 60 61 static 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 } 72 DEFINE_SHOW_ATTRIBUTE(ucsi_resp); 73 74 void 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 85 void 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 94 void ucsi_debugfs_init(void) 95 { 96 ucsi_debugfs_root = debugfs_create_dir("ucsi", usb_debug_root); 97 } 98 99 void ucsi_debugfs_exit(void) 100 { 101 debugfs_remove(ucsi_debugfs_root); 102 } 103