drivers/nfc/microread/mei.c

   1 /*
   2  * HCI based Driver for Inside Secure microread NFC Chip
   3  *
   4  * Copyright (C) 2013  Intel Corporation. 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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  20
  21 #include <linux/module.h>
  22 #include <linux/mod_devicetable.h>
  23 #include <linux/nfc.h>
  24 #include <net/nfc/hci.h>
  25 #include <net/nfc/llc.h>
  26
  27 #include "../mei_phy.h"
  28 #include "microread.h"
  29
  30 #define MICROREAD_DRIVER_NAME "microread"
  31
  32 static int microread_mei_probe(struct mei_cl_device *cldev,
  33                                const struct mei_cl_device_id *id)
  34 {
  35         struct nfc_mei_phy *phy;
  36         int r;
  37
  38         pr_info("Probing NFC microread\n");
  39
  40         phy = nfc_mei_phy_alloc(cldev);
  41         if (!phy) {
  42                 pr_err("Cannot allocate memory for microread mei phy.\n");
  43                 return -ENOMEM;
  44         }
  45
  46         r = microread_probe(phy, &mei_phy_ops, LLC_NOP_NAME,
  47                             MEI_NFC_HEADER_SIZE, 0, MEI_NFC_MAX_HCI_PAYLOAD,
  48                             &phy->hdev);
  49         if (r < 0) {
  50                 nfc_mei_phy_free(phy);
  51
  52                 return r;
  53         }
  54
  55         return 0;
  56 }
  57
  58 static int microread_mei_remove(struct mei_cl_device *cldev)
  59 {
  60         struct nfc_mei_phy *phy = mei_cldev_get_drvdata(cldev);
  61
  62         microread_remove(phy->hdev);
  63
  64         nfc_mei_phy_free(phy);
  65
  66         return 0;
  67 }
  68
  69 static struct mei_cl_device_id microread_mei_tbl[] = {
  70         { MICROREAD_DRIVER_NAME, MEI_NFC_UUID, MEI_CL_VERSION_ANY},
  71
  72         /* required last entry */
  73         { }
  74 };
  75 MODULE_DEVICE_TABLE(mei, microread_mei_tbl);
  76
  77 static struct mei_cl_driver microread_driver = {
  78         .id_table = microread_mei_tbl,
  79         .name = MICROREAD_DRIVER_NAME,
  80
  81         .probe = microread_mei_probe,
  82         .remove = microread_mei_remove,
  83 };
  84
  85 static int microread_mei_init(void)
  86 {
  87         int r;
  88
  89         pr_debug(DRIVER_DESC ": %s\n", __func__);
  90
  91         r = mei_cldev_driver_register(&microread_driver);
  92         if (r) {
  93                 pr_err(MICROREAD_DRIVER_NAME ": driver registration failed\n");
  94                 return r;
  95         }
  96
  97         return 0;
  98 }
  99
 100 static void microread_mei_exit(void)
 101 {
 102         mei_cldev_driver_unregister(&microread_driver);
 103 }
 104
 105 module_init(microread_mei_init);
 106 module_exit(microread_mei_exit);
 107
 108 MODULE_LICENSE("GPL");
 109 MODULE_DESCRIPTION(DRIVER_DESC);