blob: ebcdba51418c4f21335454d77bcb289fc68f467c [file] [log] [blame]
Frederic Danis8a00a612013-05-29 15:35:02 +02001/*
2 * Copyright (C) 2013 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
16 *
17 */
18
19#define pr_fmt(fmt) "nci_spi: %s: " fmt, __func__
20
21#include <linux/export.h>
22#include <linux/spi/spi.h>
23#include <linux/nfc.h>
24#include <net/nfc/nci_core.h>
25
26#define NCI_SPI_HDR_LEN 4
27#define NCI_SPI_CRC_LEN 2
28
29static int nci_spi_open(struct nci_dev *nci_dev)
30{
31 struct nci_spi_dev *ndev = nci_get_drvdata(nci_dev);
32
33 return ndev->ops->open(ndev);
34}
35
36static int nci_spi_close(struct nci_dev *nci_dev)
37{
38 struct nci_spi_dev *ndev = nci_get_drvdata(nci_dev);
39
40 return ndev->ops->close(ndev);
41}
42
43static int nci_spi_send(struct nci_dev *nci_dev, struct sk_buff *skb)
44{
45 return 0;
46}
47
48static struct nci_ops nci_spi_ops = {
49 .open = nci_spi_open,
50 .close = nci_spi_close,
51 .send = nci_spi_send,
52};
53
54/* ---- Interface to NCI SPI drivers ---- */
55
56/**
57 * nci_spi_allocate_device - allocate a new nci spi device
58 *
59 * @spi: SPI device
60 * @ops: device operations
61 * @supported_protocols: NFC protocols supported by the device
62 * @supported_se: NFC Secure Elements supported by the device
63 * @acknowledge_mode: Acknowledge mode used by the device
64 * @delay: delay between transactions in us
65 */
66struct nci_spi_dev *nci_spi_allocate_device(struct spi_device *spi,
67 struct nci_spi_ops *ops,
68 u32 supported_protocols,
69 u32 supported_se,
70 u8 acknowledge_mode,
71 unsigned int delay)
72{
73 struct nci_spi_dev *ndev;
74 int tailroom = 0;
75
76 if (!ops->open || !ops->close || !ops->assert_int || !ops->deassert_int)
77 return NULL;
78
79 if (!supported_protocols)
80 return NULL;
81
82 ndev = devm_kzalloc(&spi->dev, sizeof(struct nci_dev), GFP_KERNEL);
83 if (!ndev)
84 return NULL;
85
86 ndev->ops = ops;
87 ndev->acknowledge_mode = acknowledge_mode;
88 ndev->xfer_udelay = delay;
89
90 if (acknowledge_mode == NCI_SPI_CRC_ENABLED)
91 tailroom += NCI_SPI_CRC_LEN;
92
93 ndev->nci_dev = nci_allocate_device(&nci_spi_ops, supported_protocols,
94 supported_se, NCI_SPI_HDR_LEN,
95 tailroom);
96 if (!ndev->nci_dev)
97 return NULL;
98
99 nci_set_drvdata(ndev->nci_dev, ndev);
100
101 return ndev;
102}
103EXPORT_SYMBOL_GPL(nci_spi_allocate_device);
104
105/**
106 * nci_spi_free_device - deallocate nci spi device
107 *
108 * @ndev: The nci spi device to deallocate
109 */
110void nci_spi_free_device(struct nci_spi_dev *ndev)
111{
112 nci_free_device(ndev->nci_dev);
113}
114EXPORT_SYMBOL_GPL(nci_spi_free_device);
115
116/**
117 * nci_spi_register_device - register a nci spi device in the nfc subsystem
118 *
119 * @pdev: The nci spi device to register
120 */
121int nci_spi_register_device(struct nci_spi_dev *ndev)
122{
123 return nci_register_device(ndev->nci_dev);
124}
125EXPORT_SYMBOL_GPL(nci_spi_register_device);
126
127/**
128 * nci_spi_unregister_device - unregister a nci spi device in the nfc subsystem
129 *
130 * @dev: The nci spi device to unregister
131 */
132void nci_spi_unregister_device(struct nci_spi_dev *ndev)
133{
134 nci_unregister_device(ndev->nci_dev);
135}
136EXPORT_SYMBOL_GPL(nci_spi_unregister_device);