drivers/nfc/pn544/mei.c

   1 /*
   2  * HCI based Driver for NXP pn544 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, write to the
  17  * Free Software Foundation, Inc.,
  18  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  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 "pn544.h"
  29
  30 #define PN544_DRIVER_NAME "pn544"
  31
  32 static int pn544_mei_probe(struct mei_cl_device *device,
  33                                const struct mei_cl_device_id *id)
  34 {
  35         struct nfc_mei_phy *phy;
  36         int r;
  37
  38         pr_info("Probing NFC pn544\n");
  39
  40         phy = nfc_mei_phy_alloc(device);
  41         if (!phy) {
  42                 pr_err("Cannot allocate memory for pn544 mei phy.\n");
  43                 return -ENOMEM;
  44         }
  45
  46         r = pn544_hci_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 pn544_mei_remove(struct mei_cl_device *device)
  59 {
  60         struct nfc_mei_phy *phy = mei_cl_get_drvdata(device);
  61
  62         pr_info("Removing pn544\n");
  63
  64         pn544_hci_remove(phy->hdev);
  65
  66         nfc_mei_phy_disable(phy);
  67
  68         nfc_mei_phy_free(phy);
  69
  70         return 0;
  71 }
  72
  73 static struct mei_cl_device_id pn544_mei_tbl[] = {
  74         { PN544_DRIVER_NAME },
  75
  76         /* required last entry */
  77         { }
  78 };
  79 MODULE_DEVICE_TABLE(mei, pn544_mei_tbl);
  80
  81 static struct mei_cl_driver pn544_driver = {
  82         .id_table = pn544_mei_tbl,
  83         .name = PN544_DRIVER_NAME,
  84
  85         .probe = pn544_mei_probe,
  86         .remove = pn544_mei_remove,
  87 };
  88
  89 static int pn544_mei_init(void)
  90 {
  91         int r;
  92
  93         pr_debug(DRIVER_DESC ": %s\n", __func__);
  94
  95         r = mei_cl_driver_register(&pn544_driver);
  96         if (r) {
  97                 pr_err(PN544_DRIVER_NAME ": driver registration failed\n");
  98                 return r;
  99         }
 100
 101         return 0;
 102 }
 103
 104 static void pn544_mei_exit(void)
 105 {
 106         mei_cl_driver_unregister(&pn544_driver);
 107 }
 108
 109 module_init(pn544_mei_init);
 110 module_exit(pn544_mei_exit);
 111
 112 MODULE_LICENSE("GPL");
 113 MODULE_DESCRIPTION(DRIVER_DESC);