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, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/mod_devicetable.h>
  21 #include <linux/nfc.h>
  22 #include <net/nfc/hci.h>
  23 #include <net/nfc/llc.h>
  24
  25 #include "../mei_phy.h"
  26 #include "pn544.h"
  27
  28 #define PN544_DRIVER_NAME "pn544"
  29
  30 static int pn544_mei_probe(struct mei_cl_device *device,
  31                                const struct mei_cl_device_id *id)
  32 {
  33         struct nfc_mei_phy *phy;
  34         int r;
  35
  36         pr_info("Probing NFC pn544\n");
  37
  38         phy = nfc_mei_phy_alloc(device);
  39         if (!phy) {
  40                 pr_err("Cannot allocate memory for pn544 mei phy.\n");
  41                 return -ENOMEM;
  42         }
  43
  44         r = pn544_hci_probe(phy, &mei_phy_ops, LLC_NOP_NAME,
  45                             MEI_NFC_HEADER_SIZE, 0, MEI_NFC_MAX_HCI_PAYLOAD,
  46                             NULL, &phy->hdev);
  47         if (r < 0) {
  48                 nfc_mei_phy_free(phy);
  49
  50                 return r;
  51         }
  52
  53         return 0;
  54 }
  55
  56 static int pn544_mei_remove(struct mei_cl_device *device)
  57 {
  58         struct nfc_mei_phy *phy = mei_cl_get_drvdata(device);
  59
  60         pr_info("Removing pn544\n");
  61
  62         pn544_hci_remove(phy->hdev);
  63
  64         nfc_mei_phy_free(phy);
  65
  66         return 0;
  67 }
  68
  69 static struct mei_cl_device_id pn544_mei_tbl[] = {
  70         { PN544_DRIVER_NAME, MEI_NFC_UUID},
  71
  72         /* required last entry */
  73         { }
  74 };
  75 MODULE_DEVICE_TABLE(mei, pn544_mei_tbl);
  76
  77 static struct mei_cl_driver pn544_driver = {
  78         .id_table = pn544_mei_tbl,
  79         .name = PN544_DRIVER_NAME,
  80
  81         .probe = pn544_mei_probe,
  82         .remove = pn544_mei_remove,
  83 };
  84
  85 static int pn544_mei_init(void)
  86 {
  87         int r;
  88
  89         pr_debug(DRIVER_DESC ": %s\n", __func__);
  90
  91         r = mei_cl_driver_register(&pn544_driver);
  92         if (r) {
  93                 pr_err(PN544_DRIVER_NAME ": driver registration failed\n");
  94                 return r;
  95         }
  96
  97         return 0;
  98 }
  99
 100 static void pn544_mei_exit(void)
 101 {
 102         mei_cl_driver_unregister(&pn544_driver);
 103 }
 104
 105 module_init(pn544_mei_init);
 106 module_exit(pn544_mei_exit);
 107
 108 MODULE_LICENSE("GPL");
 109 MODULE_DESCRIPTION(DRIVER_DESC);