diff options
| -rw-r--r-- | Documentation/devicetree/bindings/net/nfc/trf7970a.txt | 4 | ||||
| -rw-r--r-- | drivers/nfc/trf7970a.c | 23 |
2 files changed, 23 insertions, 4 deletions
diff --git a/Documentation/devicetree/bindings/net/nfc/trf7970a.txt b/Documentation/devicetree/bindings/net/nfc/trf7970a.txt index 7c89ca290ced..32b35a07abe4 100644 --- a/Documentation/devicetree/bindings/net/nfc/trf7970a.txt +++ b/Documentation/devicetree/bindings/net/nfc/trf7970a.txt @@ -18,6 +18,9 @@ Optional SoC Specific Properties: "IRQ Status Read" erratum. - en2-rf-quirk: Specify that the trf7970a being used has the "EN2 RF" erratum. +- t5t-rmb-extra-byte-quirk: Specify that the trf7970a has the erratum + where an extra byte is returned by Read Multiple Block commands issued + to Type 5 tags. Example (for ARM-based BeagleBone with TRF7970A on SPI1): @@ -39,6 +42,7 @@ Example (for ARM-based BeagleBone with TRF7970A on SPI1): autosuspend-delay = <30000>; irq-status-read-quirk; en2-rf-quirk; + t5t-rmb-extra-byte-quirk; status = "okay"; }; }; diff --git a/drivers/nfc/trf7970a.c b/drivers/nfc/trf7970a.c index aa6a333b2ead..85b4d86772d8 100644 --- a/drivers/nfc/trf7970a.c +++ b/drivers/nfc/trf7970a.c @@ -149,6 +149,7 @@ */ #define TRF7970A_QUIRK_IRQ_STATUS_READ BIT(0) #define TRF7970A_QUIRK_EN2_MUST_STAY_LOW BIT(1) +#define TRF7970A_QUIRK_T5T_RMB_EXTRA_BYTE BIT(2) /* Direct commands */ #define TRF7970A_CMD_IDLE 0x00 @@ -446,6 +447,7 @@ struct trf7970a { u8 md_rf_tech; u8 tx_cmd; bool issue_eof; + bool adjust_resp_len; int en2_gpio; int en_gpio; struct mutex lock; @@ -626,6 +628,11 @@ static void trf7970a_send_upstream(struct trf7970a *trf) trf->aborting = false; } + if (trf->adjust_resp_len) { + skb_trim(trf->rx_skb, trf->rx_skb->len - 1); + trf->adjust_resp_len = false; + } + trf->cb(trf->ddev, trf->cb_arg, trf->rx_skb); trf->rx_skb = NULL; @@ -1429,10 +1436,15 @@ static int trf7970a_per_cmd_config(struct trf7970a *trf, struct sk_buff *skb) trf->iso_ctrl = iso_ctrl; } - if ((trf->framing == NFC_DIGITAL_FRAMING_ISO15693_T5T) && - trf7970a_is_iso15693_write_or_lock(req[1]) && - (req[0] & ISO15693_REQ_FLAG_OPTION)) - trf->issue_eof = true; + if (trf->framing == NFC_DIGITAL_FRAMING_ISO15693_T5T) { + if (trf7970a_is_iso15693_write_or_lock(req[1]) && + (req[0] & ISO15693_REQ_FLAG_OPTION)) + trf->issue_eof = true; + else if ((trf->quirks & + TRF7970A_QUIRK_T5T_RMB_EXTRA_BYTE) && + (req[1] == ISO15693_CMD_READ_MULTIPLE_BLOCK)) + trf->adjust_resp_len = true; + } } return 0; @@ -1992,6 +2004,9 @@ static int trf7970a_probe(struct spi_device *spi) return ret; } + if (of_property_read_bool(np, "t5t-rmb-extra-byte-quirk")) + trf->quirks |= TRF7970A_QUIRK_T5T_RMB_EXTRA_BYTE; + if (of_property_read_bool(np, "irq-status-read-quirk")) trf->quirks |= TRF7970A_QUIRK_IRQ_STATUS_READ; |