drivers/usb/typec/ucsi/debugfs.c

   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 }