| /* |
| * Copyright (C) 2013 Intel Corporation. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms and conditions of the GNU General Public License, |
| * version 2, as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| * You should have received a copy of the GNU General Public License along with |
| * this program; if not, write to the Free Software Foundation, Inc., |
| * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| */ |
| |
| #define pr_fmt(fmt) "nci_spi: %s: " fmt, __func__ |
| |
| #include <linux/export.h> |
| #include <linux/spi/spi.h> |
| #include <linux/nfc.h> |
| #include <net/nfc/nci_core.h> |
| |
| #define NCI_SPI_HDR_LEN 4 |
| #define NCI_SPI_CRC_LEN 2 |
| |
| static int nci_spi_open(struct nci_dev *nci_dev) |
| { |
| struct nci_spi_dev *ndev = nci_get_drvdata(nci_dev); |
| |
| return ndev->ops->open(ndev); |
| } |
| |
| static int nci_spi_close(struct nci_dev *nci_dev) |
| { |
| struct nci_spi_dev *ndev = nci_get_drvdata(nci_dev); |
| |
| return ndev->ops->close(ndev); |
| } |
| |
| static int nci_spi_send(struct nci_dev *nci_dev, struct sk_buff *skb) |
| { |
| return 0; |
| } |
| |
| static struct nci_ops nci_spi_ops = { |
| .open = nci_spi_open, |
| .close = nci_spi_close, |
| .send = nci_spi_send, |
| }; |
| |
| /* ---- Interface to NCI SPI drivers ---- */ |
| |
| /** |
| * nci_spi_allocate_device - allocate a new nci spi device |
| * |
| * @spi: SPI device |
| * @ops: device operations |
| * @supported_protocols: NFC protocols supported by the device |
| * @supported_se: NFC Secure Elements supported by the device |
| * @acknowledge_mode: Acknowledge mode used by the device |
| * @delay: delay between transactions in us |
| */ |
| struct nci_spi_dev *nci_spi_allocate_device(struct spi_device *spi, |
| struct nci_spi_ops *ops, |
| u32 supported_protocols, |
| u32 supported_se, |
| u8 acknowledge_mode, |
| unsigned int delay) |
| { |
| struct nci_spi_dev *ndev; |
| int tailroom = 0; |
| |
| if (!ops->open || !ops->close || !ops->assert_int || !ops->deassert_int) |
| return NULL; |
| |
| if (!supported_protocols) |
| return NULL; |
| |
| ndev = devm_kzalloc(&spi->dev, sizeof(struct nci_dev), GFP_KERNEL); |
| if (!ndev) |
| return NULL; |
| |
| ndev->ops = ops; |
| ndev->acknowledge_mode = acknowledge_mode; |
| ndev->xfer_udelay = delay; |
| |
| if (acknowledge_mode == NCI_SPI_CRC_ENABLED) |
| tailroom += NCI_SPI_CRC_LEN; |
| |
| ndev->nci_dev = nci_allocate_device(&nci_spi_ops, supported_protocols, |
| supported_se, NCI_SPI_HDR_LEN, |
| tailroom); |
| if (!ndev->nci_dev) |
| return NULL; |
| |
| nci_set_drvdata(ndev->nci_dev, ndev); |
| |
| return ndev; |
| } |
| EXPORT_SYMBOL_GPL(nci_spi_allocate_device); |
| |
| /** |
| * nci_spi_free_device - deallocate nci spi device |
| * |
| * @ndev: The nci spi device to deallocate |
| */ |
| void nci_spi_free_device(struct nci_spi_dev *ndev) |
| { |
| nci_free_device(ndev->nci_dev); |
| } |
| EXPORT_SYMBOL_GPL(nci_spi_free_device); |
| |
| /** |
| * nci_spi_register_device - register a nci spi device in the nfc subsystem |
| * |
| * @pdev: The nci spi device to register |
| */ |
| int nci_spi_register_device(struct nci_spi_dev *ndev) |
| { |
| return nci_register_device(ndev->nci_dev); |
| } |
| EXPORT_SYMBOL_GPL(nci_spi_register_device); |
| |
| /** |
| * nci_spi_unregister_device - unregister a nci spi device in the nfc subsystem |
| * |
| * @dev: The nci spi device to unregister |
| */ |
| void nci_spi_unregister_device(struct nci_spi_dev *ndev) |
| { |
| nci_unregister_device(ndev->nci_dev); |
| } |
| EXPORT_SYMBOL_GPL(nci_spi_unregister_device); |