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authorEric Lapuyade <eric.lapuyade@linux.intel.com>2013-09-05 11:02:21 +0200
committerSamuel Ortiz <sameo@linux.intel.com>2013-09-25 01:35:41 +0200
commitfa544fff62aeeb0cf8008c61077aae10fb1407a9 (patch)
tree42e24efbcaca24ad48bde91259696649388483d3 /net/nfc
parent08f13acff960d6c95a371f67ab98785aa9969179 (diff)
NFC: NCI: Simplify NCI SPI to become a simple framing/checking layer
NCI SPI layer should not manage the nci dev, this is the job of the nci chipset driver. This layer should be limited to frame/deframe nci packets, and optionnaly check integrity (crc) and manage the ack/nak protocol. The NCI SPI must not be mixed up with an NCI dev. spi_[dev|device] are therefore renamed to a simple spi for more clarity. The header and crc sizes are moved to nci.h so that drivers can use them to reserve space in outgoing skbs. nci_spi_send() is exported to be accessible by drivers. Signed-off-by: Eric Lapuyade <eric.lapuyade@intel.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'net/nfc')
-rw-r--r--net/nfc/nci/spi.c180
1 files changed, 55 insertions, 125 deletions
diff --git a/net/nfc/nci/spi.c b/net/nfc/nci/spi.c
index e66fda4d9ede..910dfd8015f4 100644
--- a/net/nfc/nci/spi.c
+++ b/net/nfc/nci/spi.c
@@ -24,8 +24,6 @@
#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
@@ -41,21 +39,7 @@
#define CRC_INIT 0xFFFF
-static int nci_spi_open(struct nci_dev *ndev)
-{
- struct nci_spi_dev *nsdev = nci_get_drvdata(ndev);
-
- return nsdev->ops->open(nsdev);
-}
-
-static int nci_spi_close(struct nci_dev *ndev)
-{
- struct nci_spi_dev *nsdev = nci_get_drvdata(ndev);
-
- return nsdev->ops->close(nsdev);
-}
-
-static int __nci_spi_send(struct nci_spi_dev *nsdev, struct sk_buff *skb)
+static int __nci_spi_send(struct nci_spi *nspi, struct sk_buff *skb)
{
struct spi_message m;
struct spi_transfer t;
@@ -63,32 +47,31 @@ static int __nci_spi_send(struct nci_spi_dev *nsdev, struct sk_buff *skb)
t.tx_buf = skb->data;
t.len = skb->len;
t.cs_change = 0;
- t.delay_usecs = nsdev->xfer_udelay;
+ t.delay_usecs = nspi->xfer_udelay;
spi_message_init(&m);
spi_message_add_tail(&t, &m);
- return spi_sync(nsdev->spi, &m);
+ return spi_sync(nspi->spi, &m);
}
-static int nci_spi_send(struct nci_dev *ndev, struct sk_buff *skb)
+int nci_spi_send(struct nci_spi *nspi, struct sk_buff *skb)
{
- struct nci_spi_dev *nsdev = nci_get_drvdata(ndev);
unsigned int payload_len = skb->len;
unsigned char *hdr;
int ret;
long completion_rc;
- nsdev->ops->deassert_int(nsdev);
+ nspi->ops->deassert_int(nspi);
/* 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] = nsdev->acknowledge_mode;
+ hdr[1] = nspi->acknowledge_mode;
hdr[2] = payload_len >> 8;
hdr[3] = payload_len & 0xFF;
- if (nsdev->acknowledge_mode == NCI_SPI_CRC_ENABLED) {
+ if (nspi->acknowledge_mode == NCI_SPI_CRC_ENABLED) {
u16 crc;
crc = crc_ccitt(CRC_INIT, skb->data, skb->len);
@@ -96,123 +79,70 @@ static int nci_spi_send(struct nci_dev *ndev, struct sk_buff *skb)
*skb_put(skb, 1) = crc & 0xFF;
}
- ret = __nci_spi_send(nsdev, skb);
+ ret = __nci_spi_send(nspi, skb);
kfree_skb(skb);
- nsdev->ops->assert_int(nsdev);
+ nspi->ops->assert_int(nspi);
- if (ret != 0 || nsdev->acknowledge_mode == NCI_SPI_CRC_DISABLED)
+ if (ret != 0 || nspi->acknowledge_mode == NCI_SPI_CRC_DISABLED)
goto done;
- init_completion(&nsdev->req_completion);
+ init_completion(&nspi->req_completion);
completion_rc = wait_for_completion_interruptible_timeout(
- &nsdev->req_completion,
+ &nspi->req_completion,
NCI_SPI_SEND_TIMEOUT);
- if (completion_rc <= 0 || nsdev->req_result == ACKNOWLEDGE_NACK)
+ if (completion_rc <= 0 || nspi->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,
-};
+EXPORT_SYMBOL_GPL(nci_spi_send);
/* ---- Interface to NCI SPI drivers ---- */
/**
- * nci_spi_allocate_device - allocate a new nci spi device
+ * nci_spi_allocate_spi - allocate a new nci spi
*
* @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
+ * @acknowledge_mode: Acknowledge mode used by the NFC device
* @delay: delay between transactions in us
+ * @ndev: nci dev to send incoming nci frames to
*/
-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 *nci_spi_allocate_spi(struct spi_device *spi,
+ struct nci_spi_ops *ops,
+ u8 acknowledge_mode, unsigned int delay,
+ struct nci_dev *ndev)
{
- struct nci_spi_dev *nsdev;
- int tailroom = 0;
-
- if (!ops->open || !ops->close || !ops->assert_int || !ops->deassert_int)
- return NULL;
-
- if (!supported_protocols)
- return NULL;
+ struct nci_spi *nspi;
- nsdev = devm_kzalloc(&spi->dev, sizeof(struct nci_spi_dev), GFP_KERNEL);
- if (!nsdev)
+ if (!ops->assert_int || !ops->deassert_int)
return NULL;
- nsdev->ops = ops;
- nsdev->acknowledge_mode = acknowledge_mode;
- nsdev->xfer_udelay = delay;
-
- if (acknowledge_mode == NCI_SPI_CRC_ENABLED)
- tailroom += NCI_SPI_CRC_LEN;
-
- nsdev->ndev = nci_allocate_device(&nci_spi_ops, supported_protocols,
- NCI_SPI_HDR_LEN, tailroom);
- if (!nsdev->ndev)
+ nspi = devm_kzalloc(&spi->dev, sizeof(struct nci_spi), GFP_KERNEL);
+ if (!nspi)
return NULL;
- nci_set_drvdata(nsdev->ndev, nsdev);
-
- return nsdev;
-}
-EXPORT_SYMBOL_GPL(nci_spi_allocate_device);
-
-/**
- * nci_spi_free_device - deallocate nci spi device
- *
- * @nsdev: The nci spi device to deallocate
- */
-void nci_spi_free_device(struct nci_spi_dev *nsdev)
-{
- nci_free_device(nsdev->ndev);
-}
-EXPORT_SYMBOL_GPL(nci_spi_free_device);
+ nspi->ops = ops;
+ nspi->acknowledge_mode = acknowledge_mode;
+ nspi->xfer_udelay = delay;
-/**
- * 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 *nsdev)
-{
- return nci_register_device(nsdev->ndev);
-}
-EXPORT_SYMBOL_GPL(nci_spi_register_device);
+ nspi->ndev = ndev;
-/**
- * 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 *nsdev)
-{
- nci_unregister_device(nsdev->ndev);
+ return nspi;
}
-EXPORT_SYMBOL_GPL(nci_spi_unregister_device);
+EXPORT_SYMBOL_GPL(nci_spi_allocate_spi);
-static int send_acknowledge(struct nci_spi_dev *nsdev, u8 acknowledge)
+static int send_acknowledge(struct nci_spi *nspi, u8 acknowledge)
{
struct sk_buff *skb;
unsigned char *hdr;
u16 crc;
int ret;
- skb = nci_skb_alloc(nsdev->ndev, 0, GFP_KERNEL);
+ skb = nci_skb_alloc(nspi->ndev, 0, GFP_KERNEL);
/* add the NCI SPI header to the start of the buffer */
hdr = skb_push(skb, NCI_SPI_HDR_LEN);
@@ -225,14 +155,14 @@ static int send_acknowledge(struct nci_spi_dev *nsdev, u8 acknowledge)
*skb_put(skb, 1) = crc >> 8;
*skb_put(skb, 1) = crc & 0xFF;
- ret = __nci_spi_send(nsdev, skb);
+ ret = __nci_spi_send(nspi, skb);
kfree_skb(skb);
return ret;
}
-static struct sk_buff *__nci_spi_recv_frame(struct nci_spi_dev *nsdev)
+static struct sk_buff *__nci_spi_recv_frame(struct nci_spi *nspi)
{
struct sk_buff *skb;
struct spi_message m;
@@ -243,7 +173,7 @@ static struct sk_buff *__nci_spi_recv_frame(struct nci_spi_dev *nsdev)
spi_message_init(&m);
req[0] = NCI_SPI_DIRECT_READ;
- req[1] = nsdev->acknowledge_mode;
+ req[1] = nspi->acknowledge_mode;
tx.tx_buf = req;
tx.len = 2;
tx.cs_change = 0;
@@ -252,18 +182,18 @@ static struct sk_buff *__nci_spi_recv_frame(struct nci_spi_dev *nsdev)
rx.len = 2;
rx.cs_change = 1;
spi_message_add_tail(&rx, &m);
- ret = spi_sync(nsdev->spi, &m);
+ ret = spi_sync(nspi->spi, &m);
if (ret)
return NULL;
- if (nsdev->acknowledge_mode == NCI_SPI_CRC_ENABLED)
+ if (nspi->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(nsdev->ndev, rx_len, GFP_KERNEL);
+ skb = nci_skb_alloc(nspi->ndev, rx_len, GFP_KERNEL);
if (!skb)
return NULL;
@@ -271,14 +201,14 @@ static struct sk_buff *__nci_spi_recv_frame(struct nci_spi_dev *nsdev)
rx.rx_buf = skb_put(skb, rx_len);
rx.len = rx_len;
rx.cs_change = 0;
- rx.delay_usecs = nsdev->xfer_udelay;
+ rx.delay_usecs = nspi->xfer_udelay;
spi_message_add_tail(&rx, &m);
- ret = spi_sync(nsdev->spi, &m);
+ ret = spi_sync(nspi->spi, &m);
if (ret)
goto receive_error;
- if (nsdev->acknowledge_mode == NCI_SPI_CRC_ENABLED) {
+ if (nspi->acknowledge_mode == NCI_SPI_CRC_ENABLED) {
*skb_push(skb, 1) = resp_hdr[1];
*skb_push(skb, 1) = resp_hdr[0];
}
@@ -320,7 +250,7 @@ static u8 nci_spi_get_ack(struct sk_buff *skb)
/**
* nci_spi_recv_frame - receive frame from NCI SPI drivers
*
- * @nsdev: The nci spi device
+ * @nspi: The nci spi
* Context: can sleep
*
* This call may only be used from a context that may sleep. The sleep
@@ -328,32 +258,32 @@ static u8 nci_spi_get_ack(struct sk_buff *skb)
*
* It returns zero on success, else a negative error code.
*/
-int nci_spi_recv_frame(struct nci_spi_dev *nsdev)
+int nci_spi_recv_frame(struct nci_spi *nspi)
{
struct sk_buff *skb;
int ret = 0;
- nsdev->ops->deassert_int(nsdev);
+ nspi->ops->deassert_int(nspi);
/* Retrieve frame from SPI */
- skb = __nci_spi_recv_frame(nsdev);
+ skb = __nci_spi_recv_frame(nspi);
if (!skb) {
ret = -EIO;
goto done;
}
- if (nsdev->acknowledge_mode == NCI_SPI_CRC_ENABLED) {
+ if (nspi->acknowledge_mode == NCI_SPI_CRC_ENABLED) {
if (!nci_spi_check_crc(skb)) {
- send_acknowledge(nsdev, ACKNOWLEDGE_NACK);
+ send_acknowledge(nspi, ACKNOWLEDGE_NACK);
goto done;
}
/* In case of acknowledged mode: if ACK or NACK received,
* unblock completion of latest frame sent.
*/
- nsdev->req_result = nci_spi_get_ack(skb);
- if (nsdev->req_result)
- complete(&nsdev->req_completion);
+ nspi->req_result = nci_spi_get_ack(skb);
+ if (nspi->req_result)
+ complete(&nspi->req_completion);
}
/* If there is no payload (ACK/NACK only frame),
@@ -364,14 +294,14 @@ int nci_spi_recv_frame(struct nci_spi_dev *nsdev)
goto done;
}
- if (nsdev->acknowledge_mode == NCI_SPI_CRC_ENABLED)
- send_acknowledge(nsdev, ACKNOWLEDGE_ACK);
+ if (nspi->acknowledge_mode == NCI_SPI_CRC_ENABLED)
+ send_acknowledge(nspi, ACKNOWLEDGE_ACK);
/* Forward skb to NCI core layer */
- ret = nci_recv_frame(nsdev->ndev, skb);
+ ret = nci_recv_frame(nspi->ndev, skb);
done:
- nsdev->ops->assert_int(nsdev);
+ nspi->ops->assert_int(nspi);
return ret;
}

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