Frederic Danis | 8a00a61 | 2013-05-29 15:35:02 +0200 | [diff] [blame^] | 1 | /* |
| 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 | |
| 29 | static 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 | |
| 36 | static 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 | |
| 43 | static int nci_spi_send(struct nci_dev *nci_dev, struct sk_buff *skb) |
| 44 | { |
| 45 | return 0; |
| 46 | } |
| 47 | |
| 48 | static 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 | */ |
| 66 | struct 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 | } |
| 103 | EXPORT_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 | */ |
| 110 | void nci_spi_free_device(struct nci_spi_dev *ndev) |
| 111 | { |
| 112 | nci_free_device(ndev->nci_dev); |
| 113 | } |
| 114 | EXPORT_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 | */ |
| 121 | int nci_spi_register_device(struct nci_spi_dev *ndev) |
| 122 | { |
| 123 | return nci_register_device(ndev->nci_dev); |
| 124 | } |
| 125 | EXPORT_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 | */ |
| 132 | void nci_spi_unregister_device(struct nci_spi_dev *ndev) |
| 133 | { |
| 134 | nci_unregister_device(ndev->nci_dev); |
| 135 | } |
| 136 | EXPORT_SYMBOL_GPL(nci_spi_unregister_device); |