net/nfc/hci/llc.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Link Layer Control manager
   4  *
   5  * Copyright (C) 2012  Intel Corporation. All rights reserved.
   6  */
   7
   8 #include <net/nfc/llc.h>
   9
  10 #include "llc.h"
  11
  12 static LIST_HEAD(llc_engines);
  13
  14 int nfc_llc_init(void)
  15 {
  16         int r;
  17
  18         r = nfc_llc_nop_register();
  19         if (r)
  20                 goto exit;
  21
  22         r = nfc_llc_shdlc_register();
  23         if (r)
  24                 goto exit;
  25
  26         return 0;
  27
  28 exit:
  29         nfc_llc_exit();
  30         return r;
  31 }
  32
  33 void nfc_llc_exit(void)
  34 {
  35         struct nfc_llc_engine *llc_engine, *n;
  36
  37         list_for_each_entry_safe(llc_engine, n, &llc_engines, entry) {
  38                 list_del(&llc_engine->entry);
  39                 kfree(llc_engine->name);
  40                 kfree(llc_engine);
  41         }
  42 }
  43
  44 int nfc_llc_register(const char *name, struct nfc_llc_ops *ops)
  45 {
  46         struct nfc_llc_engine *llc_engine;
  47
  48         llc_engine = kzalloc(sizeof(struct nfc_llc_engine), GFP_KERNEL);
  49         if (llc_engine == NULL)
  50                 return -ENOMEM;
  51
  52         llc_engine->name = kstrdup(name, GFP_KERNEL);
  53         if (llc_engine->name == NULL) {
  54                 kfree(llc_engine);
  55                 return -ENOMEM;
  56         }
  57         llc_engine->ops = ops;
  58
  59         INIT_LIST_HEAD(&llc_engine->entry);
  60         list_add_tail(&llc_engine->entry, &llc_engines);
  61
  62         return 0;
  63 }
  64
  65 static struct nfc_llc_engine *nfc_llc_name_to_engine(const char *name)
  66 {
  67         struct nfc_llc_engine *llc_engine;
  68
  69         list_for_each_entry(llc_engine, &llc_engines, entry) {
  70                 if (strcmp(llc_engine->name, name) == 0)
  71                         return llc_engine;
  72         }
  73
  74         return NULL;
  75 }
  76
  77 void nfc_llc_unregister(const char *name)
  78 {
  79         struct nfc_llc_engine *llc_engine;
  80
  81         llc_engine = nfc_llc_name_to_engine(name);
  82         if (llc_engine == NULL)
  83                 return;
  84
  85         list_del(&llc_engine->entry);
  86         kfree(llc_engine->name);
  87         kfree(llc_engine);
  88 }
  89
  90 struct nfc_llc *nfc_llc_allocate(const char *name, struct nfc_hci_dev *hdev,
  91                                  xmit_to_drv_t xmit_to_drv,
  92                                  rcv_to_hci_t rcv_to_hci, int tx_headroom,
  93                                  int tx_tailroom, llc_failure_t llc_failure)
  94 {
  95         struct nfc_llc_engine *llc_engine;
  96         struct nfc_llc *llc;
  97
  98         llc_engine = nfc_llc_name_to_engine(name);
  99         if (llc_engine == NULL)
 100                 return NULL;
 101
 102         llc = kzalloc(sizeof(struct nfc_llc), GFP_KERNEL);
 103         if (llc == NULL)
 104                 return NULL;
 105
 106         llc->data = llc_engine->ops->init(hdev, xmit_to_drv, rcv_to_hci,
 107                                           tx_headroom, tx_tailroom,
 108                                           &llc->rx_headroom, &llc->rx_tailroom,
 109                                           llc_failure);
 110         if (llc->data == NULL) {
 111                 kfree(llc);
 112                 return NULL;
 113         }
 114         llc->ops = llc_engine->ops;
 115
 116         return llc;
 117 }
 118
 119 void nfc_llc_free(struct nfc_llc *llc)
 120 {
 121         llc->ops->deinit(llc);
 122         kfree(llc);
 123 }
 124
 125 int nfc_llc_start(struct nfc_llc *llc)
 126 {
 127         return llc->ops->start(llc);
 128 }
 129 EXPORT_SYMBOL(nfc_llc_start);
 130
 131 int nfc_llc_stop(struct nfc_llc *llc)
 132 {
 133         return llc->ops->stop(llc);
 134 }
 135 EXPORT_SYMBOL(nfc_llc_stop);
 136
 137 void nfc_llc_rcv_from_drv(struct nfc_llc *llc, struct sk_buff *skb)
 138 {
 139         llc->ops->rcv_from_drv(llc, skb);
 140 }
 141
 142 int nfc_llc_xmit_from_hci(struct nfc_llc *llc, struct sk_buff *skb)
 143 {
 144         return llc->ops->xmit_from_hci(llc, skb);
 145 }
 146
 147 void *nfc_llc_get_data(struct nfc_llc *llc)
 148 {
 149         return llc->data;
 150 }