diff options
Diffstat (limited to 'drivers/nfc/trf7970a.c')
| -rw-r--r-- | drivers/nfc/trf7970a.c | 39 |
1 files changed, 24 insertions, 15 deletions
diff --git a/drivers/nfc/trf7970a.c b/drivers/nfc/trf7970a.c index c6216c1cc4b9..8a13daf97747 100644 --- a/drivers/nfc/trf7970a.c +++ b/drivers/nfc/trf7970a.c @@ -125,13 +125,6 @@ #define TRF7970A_AUTOSUSPEND_DELAY 30000 /* 30 seconds */ -/* TX data must be prefixed with a FIFO reset cmd, a cmd that depends - * on what the current framing is, the address of the TX length byte 1 - * register (0x1d), and the 2 byte length of the data to be transmitted. - * That totals 5 bytes. - */ -#define TRF7970A_TX_SKB_HEADROOM 5 - #define TRF7970A_RX_SKB_ALLOC_SIZE 256 #define TRF7970A_FIFO_SIZE 127 @@ -515,15 +508,29 @@ static void trf7970a_send_err_upstream(struct trf7970a *trf, int errno) } static int trf7970a_transmit(struct trf7970a *trf, struct sk_buff *skb, - unsigned int len) + unsigned int len, u8 *prefix, unsigned int prefix_len) { + struct spi_transfer t[2]; + struct spi_message m; unsigned int timeout; int ret; print_hex_dump_debug("trf7970a tx data: ", DUMP_PREFIX_NONE, 16, 1, skb->data, len, false); - ret = spi_write(trf->spi, skb->data, len); + spi_message_init(&m); + + memset(&t, 0, sizeof(t)); + + t[0].tx_buf = prefix; + t[0].len = prefix_len; + spi_message_add_tail(&t[0], &m); + + t[1].tx_buf = skb->data; + t[1].len = len; + spi_message_add_tail(&t[1], &m); + + ret = spi_sync(trf->spi, &m); if (ret) { dev_err(trf->dev, "%s - Can't send tx data: %d\n", __func__, ret); @@ -559,6 +566,7 @@ static void trf7970a_fill_fifo(struct trf7970a *trf) unsigned int len; int ret; u8 fifo_bytes; + u8 prefix; ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes); if (ret) { @@ -574,7 +582,9 @@ static void trf7970a_fill_fifo(struct trf7970a *trf) len = TRF7970A_FIFO_SIZE - fifo_bytes; len = min(skb->len, len); - ret = trf7970a_transmit(trf, skb, len); + prefix = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_FIFO_IO_REGISTER; + + ret = trf7970a_transmit(trf, skb, len, &prefix, sizeof(prefix)); if (ret) trf7970a_send_err_upstream(trf, ret); } @@ -1108,7 +1118,7 @@ static int trf7970a_in_send_cmd(struct nfc_digital_dev *ddev, nfc_digital_cmd_complete_t cb, void *arg) { struct trf7970a *trf = nfc_digital_get_drvdata(ddev); - char *prefix; + u8 prefix[5]; unsigned int len; int ret; u8 status; @@ -1164,11 +1174,11 @@ static int trf7970a_in_send_cmd(struct nfc_digital_dev *ddev, trf->ignore_timeout = false; len = skb->len; - prefix = skb_push(skb, TRF7970A_TX_SKB_HEADROOM); /* TX data must be prefixed with a FIFO reset cmd, a cmd that depends * on what the current framing is, the address of the TX length byte 1 * register (0x1d), and the 2 byte length of the data to be transmitted. + * That totals 5 bytes. */ prefix[0] = TRF7970A_CMD_BIT_CTRL | TRF7970A_CMD_BIT_OPCODE(TRF7970A_CMD_FIFO_RESET); @@ -1192,7 +1202,7 @@ static int trf7970a_in_send_cmd(struct nfc_digital_dev *ddev, if (ret) goto out_err; - ret = trf7970a_transmit(trf, skb, len); + ret = trf7970a_transmit(trf, skb, len, prefix, sizeof(prefix)); if (ret) { kfree_skb(trf->rx_skb); trf->rx_skb = NULL; @@ -1377,8 +1387,7 @@ static int trf7970a_probe(struct spi_device *spi) trf->ddev = nfc_digital_allocate_device(&trf7970a_nfc_ops, TRF7970A_SUPPORTED_PROTOCOLS, - NFC_DIGITAL_DRV_CAPS_IN_CRC, TRF7970A_TX_SKB_HEADROOM, - 0); + NFC_DIGITAL_DRV_CAPS_IN_CRC, 0, 0); if (!trf->ddev) { dev_err(trf->dev, "Can't allocate NFC digital device\n"); ret = -ENOMEM; |