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Diffstat (limited to 'net/nfc/nci/spi.c')
-rw-r--r--net/nfc/nci/spi.c378
1 files changed, 378 insertions, 0 deletions
diff --git a/net/nfc/nci/spi.c b/net/nfc/nci/spi.c
new file mode 100644
index 000000000000..c7cf37ba7298
--- /dev/null
+++ b/net/nfc/nci/spi.c
@@ -0,0 +1,378 @@
+/*
+ * 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/crc-ccitt.h>
+#include <linux/nfc.h>
+#include <net/nfc/nci_core.h>
+
+#define NCI_SPI_HDR_LEN 4
+#define NCI_SPI_CRC_LEN 2
+#define NCI_SPI_ACK_SHIFT 6
+#define NCI_SPI_MSB_PAYLOAD_MASK 0x3F
+
+#define NCI_SPI_SEND_TIMEOUT (NCI_CMD_TIMEOUT > NCI_DATA_TIMEOUT ? \
+ NCI_CMD_TIMEOUT : NCI_DATA_TIMEOUT)
+
+#define NCI_SPI_DIRECT_WRITE 0x01
+#define NCI_SPI_DIRECT_READ 0x02
+
+#define ACKNOWLEDGE_NONE 0
+#define ACKNOWLEDGE_ACK 1
+#define ACKNOWLEDGE_NACK 2
+
+#define CRC_INIT 0xFFFF
+
+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_spi_dev *ndev, struct sk_buff *skb)
+{
+ struct spi_message m;
+ struct spi_transfer t;
+
+ t.tx_buf = skb->data;
+ t.len = skb->len;
+ t.cs_change = 0;
+ t.delay_usecs = ndev->xfer_udelay;
+
+ spi_message_init(&m);
+ spi_message_add_tail(&t, &m);
+
+ return spi_sync(ndev->spi, &m);
+}
+
+static int nci_spi_send(struct nci_dev *nci_dev, struct sk_buff *skb)
+{
+ struct nci_spi_dev *ndev = nci_get_drvdata(nci_dev);
+ unsigned int payload_len = skb->len;
+ unsigned char *hdr;
+ int ret;
+ long completion_rc;
+
+ ndev->ops->deassert_int(ndev);
+
+ /* add the NCI SPI header to the start of the buffer */
+ hdr = skb_push(skb, NCI_SPI_HDR_LEN);
+ hdr[0] = NCI_SPI_DIRECT_WRITE;
+ hdr[1] = ndev->acknowledge_mode;
+ hdr[2] = payload_len >> 8;
+ hdr[3] = payload_len & 0xFF;
+
+ if (ndev->acknowledge_mode == NCI_SPI_CRC_ENABLED) {
+ u16 crc;
+
+ crc = crc_ccitt(CRC_INIT, skb->data, skb->len);
+ *skb_put(skb, 1) = crc >> 8;
+ *skb_put(skb, 1) = crc & 0xFF;
+ }
+
+ ret = __nci_spi_send(ndev, skb);
+
+ kfree_skb(skb);
+ ndev->ops->assert_int(ndev);
+
+ if (ret != 0 || ndev->acknowledge_mode == NCI_SPI_CRC_DISABLED)
+ goto done;
+
+ init_completion(&ndev->req_completion);
+ completion_rc =
+ wait_for_completion_interruptible_timeout(&ndev->req_completion,
+ NCI_SPI_SEND_TIMEOUT);
+
+ if (completion_rc <= 0 || ndev->req_result == ACKNOWLEDGE_NACK)
+ ret = -EIO;
+
+done:
+ return ret;
+}
+
+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,
+ 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);
+
+static int send_acknowledge(struct nci_spi_dev *ndev, u8 acknowledge)
+{
+ struct sk_buff *skb;
+ unsigned char *hdr;
+ u16 crc;
+ int ret;
+
+ skb = nci_skb_alloc(ndev->nci_dev, 0, GFP_KERNEL);
+
+ /* add the NCI SPI header to the start of the buffer */
+ hdr = skb_push(skb, NCI_SPI_HDR_LEN);
+ hdr[0] = NCI_SPI_DIRECT_WRITE;
+ hdr[1] = NCI_SPI_CRC_ENABLED;
+ hdr[2] = acknowledge << NCI_SPI_ACK_SHIFT;
+ hdr[3] = 0;
+
+ crc = crc_ccitt(CRC_INIT, skb->data, skb->len);
+ *skb_put(skb, 1) = crc >> 8;
+ *skb_put(skb, 1) = crc & 0xFF;
+
+ ret = __nci_spi_send(ndev, skb);
+
+ kfree_skb(skb);
+
+ return ret;
+}
+
+static struct sk_buff *__nci_spi_recv_frame(struct nci_spi_dev *ndev)
+{
+ struct sk_buff *skb;
+ struct spi_message m;
+ unsigned char req[2], resp_hdr[2];
+ struct spi_transfer tx, rx;
+ unsigned short rx_len = 0;
+ int ret;
+
+ spi_message_init(&m);
+ req[0] = NCI_SPI_DIRECT_READ;
+ req[1] = ndev->acknowledge_mode;
+ tx.tx_buf = req;
+ tx.len = 2;
+ tx.cs_change = 0;
+ spi_message_add_tail(&tx, &m);
+ rx.rx_buf = resp_hdr;
+ rx.len = 2;
+ rx.cs_change = 1;
+ spi_message_add_tail(&rx, &m);
+ ret = spi_sync(ndev->spi, &m);
+
+ if (ret)
+ return NULL;
+
+ if (ndev->acknowledge_mode == NCI_SPI_CRC_ENABLED)
+ rx_len = ((resp_hdr[0] & NCI_SPI_MSB_PAYLOAD_MASK) << 8) +
+ resp_hdr[1] + NCI_SPI_CRC_LEN;
+ else
+ rx_len = (resp_hdr[0] << 8) | resp_hdr[1];
+
+ skb = nci_skb_alloc(ndev->nci_dev, rx_len, GFP_KERNEL);
+ if (!skb)
+ return NULL;
+
+ spi_message_init(&m);
+ rx.rx_buf = skb_put(skb, rx_len);
+ rx.len = rx_len;
+ rx.cs_change = 0;
+ rx.delay_usecs = ndev->xfer_udelay;
+ spi_message_add_tail(&rx, &m);
+ ret = spi_sync(ndev->spi, &m);
+
+ if (ret)
+ goto receive_error;
+
+ if (ndev->acknowledge_mode == NCI_SPI_CRC_ENABLED) {
+ *skb_push(skb, 1) = resp_hdr[1];
+ *skb_push(skb, 1) = resp_hdr[0];
+ }
+
+ return skb;
+
+receive_error:
+ kfree_skb(skb);
+
+ return NULL;
+}
+
+static int nci_spi_check_crc(struct sk_buff *skb)
+{
+ u16 crc_data = (skb->data[skb->len - 2] << 8) |
+ skb->data[skb->len - 1];
+ int ret;
+
+ ret = (crc_ccitt(CRC_INIT, skb->data, skb->len - NCI_SPI_CRC_LEN)
+ == crc_data);
+
+ skb_trim(skb, skb->len - NCI_SPI_CRC_LEN);
+
+ return ret;
+}
+
+static u8 nci_spi_get_ack(struct sk_buff *skb)
+{
+ u8 ret;
+
+ ret = skb->data[0] >> NCI_SPI_ACK_SHIFT;
+
+ /* Remove NFCC part of the header: ACK, NACK and MSB payload len */
+ skb_pull(skb, 2);
+
+ return ret;
+}
+
+/**
+ * nci_spi_recv_frame - receive frame from NCI SPI drivers
+ *
+ * @ndev: The nci spi device
+ * Context: can sleep
+ *
+ * This call may only be used from a context that may sleep. The sleep
+ * is non-interruptible, and has no timeout.
+ *
+ * It returns zero on success, else a negative error code.
+ */
+int nci_spi_recv_frame(struct nci_spi_dev *ndev)
+{
+ struct sk_buff *skb;
+ int ret = 0;
+
+ ndev->ops->deassert_int(ndev);
+
+ /* Retrieve frame from SPI */
+ skb = __nci_spi_recv_frame(ndev);
+ if (!skb) {
+ ret = -EIO;
+ goto done;
+ }
+
+ if (ndev->acknowledge_mode == NCI_SPI_CRC_ENABLED) {
+ if (!nci_spi_check_crc(skb)) {
+ send_acknowledge(ndev, ACKNOWLEDGE_NACK);
+ goto done;
+ }
+
+ /* In case of acknowledged mode: if ACK or NACK received,
+ * unblock completion of latest frame sent.
+ */
+ ndev->req_result = nci_spi_get_ack(skb);
+ if (ndev->req_result)
+ complete(&ndev->req_completion);
+ }
+
+ /* If there is no payload (ACK/NACK only frame),
+ * free the socket buffer
+ */
+ if (skb->len == 0) {
+ kfree_skb(skb);
+ goto done;
+ }
+
+ if (ndev->acknowledge_mode == NCI_SPI_CRC_ENABLED)
+ send_acknowledge(ndev, ACKNOWLEDGE_ACK);
+
+ /* Forward skb to NCI core layer */
+ ret = nci_recv_frame(ndev->nci_dev, skb);
+
+done:
+ ndev->ops->assert_int(ndev);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nci_spi_recv_frame);