kernel/drivers/nfc/st21nfca/vendor_cmds.c

   1 /*
   2  * Proprietary commands extension for STMicroelectronics NFC Chip
   3  *
   4  * Copyright (C) 2014-2015  STMicroelectronics SAS. All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <net/genetlink.h>
  20 #include <linux/module.h>
  21 #include <linux/nfc.h>
  22 #include <net/nfc/hci.h>
  23 #include <net/nfc/llc.h>
  24
  25 #include "st21nfca.h"
  26
  27 #define ST21NFCA_HCI_DM_GETDATA                 0x10
  28 #define ST21NFCA_HCI_DM_PUTDATA                 0x11
  29 #define ST21NFCA_HCI_DM_LOAD                    0x12
  30 #define ST21NFCA_HCI_DM_GETINFO                 0x13
  31 #define ST21NFCA_HCI_DM_UPDATE_AID              0x20
  32 #define ST21NFCA_HCI_DM_RESET                   0x3e
  33
  34 #define ST21NFCA_HCI_DM_FIELD_GENERATOR         0x32
  35
  36 #define ST21NFCA_FACTORY_MODE_ON                1
  37 #define ST21NFCA_FACTORY_MODE_OFF               0
  38
  39 #define ST21NFCA_EVT_POST_DATA                  0x02
  40
  41 struct get_param_data {
  42         u8 gate;
  43         u8 data;
  44 } __packed;
  45
  46 static int st21nfca_factory_mode(struct nfc_dev *dev, void *data,
  47                                size_t data_len)
  48 {
  49         struct nfc_hci_dev *hdev = nfc_get_drvdata(dev);
  50
  51         if (data_len != 1)
  52                 return -EINVAL;
  53
  54         pr_debug("factory mode: %x\n", ((u8 *)data)[0]);
  55
  56         switch (((u8 *)data)[0]) {
  57         case ST21NFCA_FACTORY_MODE_ON:
  58                 test_and_set_bit(ST21NFCA_FACTORY_MODE, &hdev->quirks);
  59         break;
  60         case ST21NFCA_FACTORY_MODE_OFF:
  61                 clear_bit(ST21NFCA_FACTORY_MODE, &hdev->quirks);
  62         break;
  63         default:
  64                 return -EINVAL;
  65         }
  66
  67         return 0;
  68 }
  69
  70 static int st21nfca_hci_clear_all_pipes(struct nfc_dev *dev, void *data,
  71                                       size_t data_len)
  72 {
  73         struct nfc_hci_dev *hdev = nfc_get_drvdata(dev);
  74
  75         return nfc_hci_disconnect_all_gates(hdev);
  76 }
  77
  78 static int st21nfca_hci_dm_put_data(struct nfc_dev *dev, void *data,
  79                                   size_t data_len)
  80 {
  81         struct nfc_hci_dev *hdev = nfc_get_drvdata(dev);
  82
  83         return nfc_hci_send_cmd(hdev, ST21NFCA_DEVICE_MGNT_GATE,
  84                                 ST21NFCA_HCI_DM_PUTDATA, data,
  85                                 data_len, NULL);
  86 }
  87
  88 static int st21nfca_hci_dm_update_aid(struct nfc_dev *dev, void *data,
  89                                     size_t data_len)
  90 {
  91         struct nfc_hci_dev *hdev = nfc_get_drvdata(dev);
  92
  93         return nfc_hci_send_cmd(hdev, ST21NFCA_DEVICE_MGNT_GATE,
  94                         ST21NFCA_HCI_DM_UPDATE_AID, data, data_len, NULL);
  95 }
  96
  97 static int st21nfca_hci_dm_get_info(struct nfc_dev *dev, void *data,
  98                                     size_t data_len)
  99 {
 100         int r;
 101         struct sk_buff *msg, *skb;
 102         struct nfc_hci_dev *hdev = nfc_get_drvdata(dev);
 103
 104         r = nfc_hci_send_cmd(hdev,
 105                              ST21NFCA_DEVICE_MGNT_GATE,
 106                              ST21NFCA_HCI_DM_GETINFO,
 107                              data, data_len, &skb);
 108         if (r)
 109                 goto exit;
 110
 111         msg = nfc_vendor_cmd_alloc_reply_skb(dev, ST21NFCA_VENDOR_OUI,
 112                                              HCI_DM_GET_INFO, skb->len);
 113         if (!msg) {
 114                 r = -ENOMEM;
 115                 goto free_skb;
 116         }
 117
 118         if (nla_put(msg, NFC_ATTR_VENDOR_DATA, skb->len, skb->data)) {
 119                 kfree_skb(msg);
 120                 r = -ENOBUFS;
 121                 goto free_skb;
 122         }
 123
 124         r = nfc_vendor_cmd_reply(msg);
 125
 126 free_skb:
 127         kfree_skb(skb);
 128 exit:
 129         return r;
 130 }
 131
 132 static int st21nfca_hci_dm_get_data(struct nfc_dev *dev, void *data,
 133                                     size_t data_len)
 134 {
 135         int r;
 136         struct sk_buff *msg, *skb;
 137         struct nfc_hci_dev *hdev = nfc_get_drvdata(dev);
 138
 139         r = nfc_hci_send_cmd(hdev,
 140                              ST21NFCA_DEVICE_MGNT_GATE,
 141                              ST21NFCA_HCI_DM_GETDATA,
 142                              data, data_len, &skb);
 143         if (r)
 144                 goto exit;
 145
 146         msg = nfc_vendor_cmd_alloc_reply_skb(dev, ST21NFCA_VENDOR_OUI,
 147                                              HCI_DM_GET_DATA, skb->len);
 148         if (!msg) {
 149                 r = -ENOMEM;
 150                 goto free_skb;
 151         }
 152
 153         if (nla_put(msg, NFC_ATTR_VENDOR_DATA, skb->len, skb->data)) {
 154                 kfree_skb(msg);
 155                 r = -ENOBUFS;
 156                 goto free_skb;
 157         }
 158
 159         r = nfc_vendor_cmd_reply(msg);
 160
 161 free_skb:
 162         kfree_skb(skb);
 163 exit:
 164         return r;
 165 }
 166
 167 static int st21nfca_hci_dm_load(struct nfc_dev *dev, void *data,
 168                                 size_t data_len)
 169 {
 170         struct nfc_hci_dev *hdev = nfc_get_drvdata(dev);
 171
 172         return nfc_hci_send_cmd(hdev, ST21NFCA_DEVICE_MGNT_GATE,
 173                                 ST21NFCA_HCI_DM_LOAD, data, data_len, NULL);
 174 }
 175
 176 static int st21nfca_hci_dm_reset(struct nfc_dev *dev, void *data,
 177                                  size_t data_len)
 178 {
 179         int r;
 180         struct nfc_hci_dev *hdev = nfc_get_drvdata(dev);
 181
 182         r = nfc_hci_send_cmd_async(hdev, ST21NFCA_DEVICE_MGNT_GATE,
 183                         ST21NFCA_HCI_DM_RESET, data, data_len, NULL, NULL);
 184         if (r < 0)
 185                 return r;
 186
 187         r = nfc_llc_stop(hdev->llc);
 188         if (r < 0)
 189                 return r;
 190
 191         return nfc_llc_start(hdev->llc);
 192 }
 193
 194 static int st21nfca_hci_get_param(struct nfc_dev *dev, void *data,
 195                                   size_t data_len)
 196 {
 197         int r;
 198         struct sk_buff *msg, *skb;
 199         struct nfc_hci_dev *hdev = nfc_get_drvdata(dev);
 200         struct get_param_data *param = (struct get_param_data *)data;
 201
 202         if (data_len < sizeof(struct get_param_data))
 203                 return -EPROTO;
 204
 205         r = nfc_hci_get_param(hdev, param->gate, param->data, &skb);
 206         if (r)
 207                 goto exit;
 208
 209         msg = nfc_vendor_cmd_alloc_reply_skb(dev, ST21NFCA_VENDOR_OUI,
 210                                              HCI_GET_PARAM, skb->len);
 211         if (!msg) {
 212                 r = -ENOMEM;
 213                 goto free_skb;
 214         }
 215
 216         if (nla_put(msg, NFC_ATTR_VENDOR_DATA, skb->len, skb->data)) {
 217                 kfree_skb(msg);
 218                 r = -ENOBUFS;
 219                 goto free_skb;
 220         }
 221
 222         r = nfc_vendor_cmd_reply(msg);
 223
 224 free_skb:
 225         kfree_skb(skb);
 226 exit:
 227         return r;
 228 }
 229
 230 static int st21nfca_hci_dm_field_generator(struct nfc_dev *dev, void *data,
 231                                            size_t data_len)
 232 {
 233         struct nfc_hci_dev *hdev = nfc_get_drvdata(dev);
 234
 235         return nfc_hci_send_cmd(hdev,
 236                                 ST21NFCA_DEVICE_MGNT_GATE,
 237                                 ST21NFCA_HCI_DM_FIELD_GENERATOR,
 238                                 data, data_len, NULL);
 239 }
 240
 241 int st21nfca_hci_loopback_event_received(struct nfc_hci_dev *hdev, u8 event,
 242                                          struct sk_buff *skb)
 243 {
 244         struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
 245
 246         switch (event) {
 247         case ST21NFCA_EVT_POST_DATA:
 248                 info->vendor_info.rx_skb = skb;
 249         break;
 250         default:
 251                 nfc_err(&hdev->ndev->dev, "Unexpected event on loopback gate\n");
 252         }
 253         complete(&info->vendor_info.req_completion);
 254         return 0;
 255 }
 256 EXPORT_SYMBOL(st21nfca_hci_loopback_event_received);
 257
 258 static int st21nfca_hci_loopback(struct nfc_dev *dev, void *data,
 259                                  size_t data_len)
 260 {
 261         int r;
 262         struct sk_buff *msg;
 263         struct nfc_hci_dev *hdev = nfc_get_drvdata(dev);
 264         struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
 265
 266         if (data_len <= 0)
 267                 return -EPROTO;
 268
 269         reinit_completion(&info->vendor_info.req_completion);
 270         info->vendor_info.rx_skb = NULL;
 271
 272         r = nfc_hci_send_event(hdev, NFC_HCI_LOOPBACK_GATE,
 273                                ST21NFCA_EVT_POST_DATA, data, data_len);
 274         if (r < 0) {
 275                 r = -EPROTO;
 276                 goto exit;
 277         }
 278
 279         wait_for_completion_interruptible(&info->vendor_info.req_completion);
 280         if (!info->vendor_info.rx_skb ||
 281             info->vendor_info.rx_skb->len != data_len) {
 282                 r = -EPROTO;
 283                 goto exit;
 284         }
 285
 286         msg = nfc_vendor_cmd_alloc_reply_skb(hdev->ndev,
 287                                         ST21NFCA_VENDOR_OUI,
 288                                         HCI_LOOPBACK,
 289                                         info->vendor_info.rx_skb->len);
 290         if (!msg) {
 291                 r = -ENOMEM;
 292                 goto free_skb;
 293         }
 294
 295         if (nla_put(msg, NFC_ATTR_VENDOR_DATA, info->vendor_info.rx_skb->len,
 296                     info->vendor_info.rx_skb->data)) {
 297                 kfree_skb(msg);
 298                 r = -ENOBUFS;
 299                 goto free_skb;
 300         }
 301
 302         r = nfc_vendor_cmd_reply(msg);
 303 free_skb:
 304         kfree_skb(info->vendor_info.rx_skb);
 305 exit:
 306         return r;
 307 }
 308
 309 static struct nfc_vendor_cmd st21nfca_vendor_cmds[] = {
 310         {
 311                 .vendor_id = ST21NFCA_VENDOR_OUI,
 312                 .subcmd = FACTORY_MODE,
 313                 .doit = st21nfca_factory_mode,
 314         },
 315         {
 316                 .vendor_id = ST21NFCA_VENDOR_OUI,
 317                 .subcmd = HCI_CLEAR_ALL_PIPES,
 318                 .doit = st21nfca_hci_clear_all_pipes,
 319         },
 320         {
 321                 .vendor_id = ST21NFCA_VENDOR_OUI,
 322                 .subcmd = HCI_DM_PUT_DATA,
 323                 .doit = st21nfca_hci_dm_put_data,
 324         },
 325         {
 326                 .vendor_id = ST21NFCA_VENDOR_OUI,
 327                 .subcmd = HCI_DM_UPDATE_AID,
 328                 .doit = st21nfca_hci_dm_update_aid,
 329         },
 330         {
 331                 .vendor_id = ST21NFCA_VENDOR_OUI,
 332                 .subcmd = HCI_DM_GET_INFO,
 333                 .doit = st21nfca_hci_dm_get_info,
 334         },
 335         {
 336                 .vendor_id = ST21NFCA_VENDOR_OUI,
 337                 .subcmd = HCI_DM_GET_DATA,
 338                 .doit = st21nfca_hci_dm_get_data,
 339         },
 340         {
 341                 .vendor_id = ST21NFCA_VENDOR_OUI,
 342                 .subcmd = HCI_DM_LOAD,
 343                 .doit = st21nfca_hci_dm_load,
 344         },
 345         {
 346                 .vendor_id = ST21NFCA_VENDOR_OUI,
 347                 .subcmd = HCI_DM_RESET,
 348                 .doit = st21nfca_hci_dm_reset,
 349         },
 350         {
 351                 .vendor_id = ST21NFCA_VENDOR_OUI,
 352                 .subcmd = HCI_GET_PARAM,
 353                 .doit = st21nfca_hci_get_param,
 354         },
 355         {
 356                 .vendor_id = ST21NFCA_VENDOR_OUI,
 357                 .subcmd = HCI_DM_FIELD_GENERATOR,
 358                 .doit = st21nfca_hci_dm_field_generator,
 359         },
 360         {
 361                 .vendor_id = ST21NFCA_VENDOR_OUI,
 362                 .subcmd = HCI_LOOPBACK,
 363                 .doit = st21nfca_hci_loopback,
 364         },
 365 };
 366
 367 int st21nfca_vendor_cmds_init(struct nfc_hci_dev *hdev)
 368 {
 369         struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
 370
 371         init_completion(&info->vendor_info.req_completion);
 372         return nfc_set_vendor_cmds(hdev->ndev, st21nfca_vendor_cmds,
 373                                    sizeof(st21nfca_vendor_cmds));
 374 }
 375 EXPORT_SYMBOL(st21nfca_vendor_cmds_init);