Add support for ISO/IEC 15693 RF technology and Type V tags. CC: Erick Macias <emacias@xxxxxx> CC: Felipe Balbi <balbi@xxxxxx> Signed-off-by: Mark A. Greer <mgreer@xxxxxxxxxxxxxxx> --- drivers/nfc/trf7970a.c | 155 +++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 151 insertions(+), 4 deletions(-) diff --git a/drivers/nfc/trf7970a.c b/drivers/nfc/trf7970a.c index 7b9cfec..5da1e78 100644 --- a/drivers/nfc/trf7970a.c +++ b/drivers/nfc/trf7970a.c @@ -74,9 +74,25 @@ * Unfortunately, that means that the driver has to peek into tx frames * when the framing is 'NFC_DIGITAL_FRAMING_NFCA_T2T'. This is done by * the trf7970a_per_cmd_config() routine. + * + * ISO/IEC 15693 frames specify whether to use single or double sub-carrier + * frequencies and whether to use low or high data rates in the flags byte + * of the frame. This means that the driver has to peek at all 15693 frames + * to determine what speed to set the communication to. In addition, Type V + * write and lock commands use the OPTION flag to indicate that an EOF must + * be sent to the tag before it will send its response. So the driver has + * to examine all Type V frames for that reason too. + * + * It is unclear how long to wait before sending the EOF. According to the + * Note under Table 1-1 in section 1.6 of + * http://www.ti.com/lit/ug/scbu011/scbu011.pdf, that wait should be at least + * 10 ms for TI Tag-it HF-I tags; however testing has shown that is not long + * enough. For this reason, the driver waits 20 ms which seems to work + * reliably. */ -#define TRF7970A_SUPPORTED_PROTOCOLS NFC_PROTO_MIFARE_MASK +#define TRF7970A_SUPPORTED_PROTOCOLS \ + (NFC_PROTO_MIFARE_MASK | NFC_PROTO_ISO15693_MASK) /* 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 @@ -94,6 +110,7 @@ #define TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT 3 #define TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT 3 +#define TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF 20 /* Quirks */ /* Erratum: When reading IRQ Status register on trf7970a, we must issue a @@ -253,6 +270,36 @@ /* NFC (ISO/IEC 14443A) Type 2 Tag commands */ #define NFC_T2T_CMD_READ 0x30 +/* ISO 15693 commands codes */ +#define ISO15693_CMD_INVENTORY 0x01 +#define ISO15693_CMD_READ_SINGLE_BLOCK 0x20 +#define ISO15693_CMD_WRITE_SINGLE_BLOCK 0x21 +#define ISO15693_CMD_LOCK_BLOCK 0x22 +#define ISO15693_CMD_READ_MULTIPLE_BLOCK 0x23 +#define ISO15693_CMD_WRITE_MULTIPLE_BLOCK 0x24 +#define ISO15693_CMD_SELECT 0x25 +#define ISO15693_CMD_RESET_TO_READY 0x26 +#define ISO15693_CMD_WRITE_AFI 0x27 +#define ISO15693_CMD_LOCK_AFI 0x28 +#define ISO15693_CMD_WRITE_DSFID 0x29 +#define ISO15693_CMD_LOCK_DSFID 0x2a +#define ISO15693_CMD_GET_SYSTEM_INFO 0x2b +#define ISO15693_CMD_GET_MULTIPLE_BLOCK_SECURITY_STATUS 0x2c + +/* ISO 15693 request and response flags */ +#define ISO15693_REQ_FLAG_SUB_CARRIER BIT(0) +#define ISO15693_REQ_FLAG_DATA_RATE BIT(1) +#define ISO15693_REQ_FLAG_INVENTORY BIT(2) +#define ISO15693_REQ_FLAG_PROTOCOL_EXT BIT(3) +#define ISO15693_REQ_FLAG_SELECT BIT(4) +#define ISO15693_REQ_FLAG_AFI BIT(4) +#define ISO15693_REQ_FLAG_ADDRESS BIT(5) +#define ISO15693_REQ_FLAG_NB_SLOTS BIT(5) +#define ISO15693_REQ_FLAG_OPTION BIT(6) + +#define ISO15693_REQ_FLAG_SPEED_MASK \ + (ISO15693_REQ_FLAG_SUB_CARRIER | ISO15693_REQ_FLAG_DATA_RATE) + enum trf7970a_state { TRF7970A_ST_OFF, TRF7970A_ST_IDLE, @@ -260,6 +307,7 @@ enum trf7970a_state { TRF7970A_ST_WAIT_FOR_TX_FIFO, TRF7970A_ST_WAIT_FOR_RX_DATA, TRF7970A_ST_WAIT_FOR_RX_DATA_CONT, + TRF7970A_ST_WAIT_TO_ISSUE_EOF, TRF7970A_ST_MAX }; @@ -279,6 +327,7 @@ struct trf7970a { int technology; int framing; u8 tx_cmd; + bool issue_eof; int ss_gpio; int en2_gpio; int en_gpio; @@ -532,8 +581,13 @@ static int trf7970a_transmit(struct trf7970a *trf, struct sk_buff *skb, trf->state = TRF7970A_ST_WAIT_FOR_TX_FIFO; timeout = TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT; } else { - trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA; - timeout = trf->timeout; + if (trf->issue_eof) { + trf->state = TRF7970A_ST_WAIT_TO_ISSUE_EOF; + timeout = TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF; + } else { + trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA; + timeout = trf->timeout; + } } dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n", timeout, @@ -709,6 +763,10 @@ static irqreturn_t trf7970a_irq(int irq, void *dev_id) trf7970a_abort_and_send_err(trf, -EIO); } break; + case TRF7970A_ST_WAIT_TO_ISSUE_EOF: + if (status != TRF7970A_IRQ_STATUS_TX) + trf7970a_abort_and_send_err(trf, -EIO); + break; default: dev_err(trf->dev, "%s - Driver in invalid state: %d\n", __func__, trf->state); @@ -718,6 +776,29 @@ static irqreturn_t trf7970a_irq(int irq, void *dev_id) return IRQ_HANDLED; } +static void trf7970a_issue_eof(struct trf7970a *trf) +{ + int ret; + + dev_dbg(trf->dev, "Issuing EOF\n"); + + ret = trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); + if (ret) + trf7970a_abort_and_send_err(trf, ret); + + ret = trf7970a_cmd(trf, TRF7970A_CMD_EOF); + if (ret) + trf7970a_abort_and_send_err(trf, ret); + + trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA; + + dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n", + trf->timeout, trf->state); + + schedule_delayed_work(&trf->timeout_work, + msecs_to_jiffies(trf->timeout)); +} + static void trf7970a_timeout_work_handler(struct work_struct *work) { struct trf7970a *trf = container_of(work, struct trf7970a, @@ -732,6 +813,8 @@ static void trf7970a_timeout_work_handler(struct work_struct *work) trf->ignore_timeout = false; else if (trf->state == TRF7970A_ST_WAIT_FOR_RX_DATA_CONT) trf7970a_send_upstream(trf); /* No more rx data so send up */ + else if (trf->state == TRF7970A_ST_WAIT_TO_ISSUE_EOF) + trf7970a_issue_eof(trf); else trf7970a_abort_and_send_err(trf, -ETIMEDOUT); @@ -750,6 +833,9 @@ static int trf7970a_config_rf_tech(struct trf7970a *trf, int tech) case NFC_DIGITAL_RF_TECH_106A: trf->iso_ctrl = TRF7970A_ISO_CTRL_14443A_106; break; + case NFC_DIGITAL_RF_TECH_ISO15693: + trf->iso_ctrl = TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648; + break; default: dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech); return -EINVAL; @@ -771,6 +857,8 @@ static int trf7970a_config_framing(struct trf7970a *trf, int framing) trf->iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; break; case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: + case NFC_DIGITAL_FRAMING_ISO15693_INVENTORY: + case NFC_DIGITAL_FRAMING_ISO15693_TVT: trf->tx_cmd = TRF7970A_CMD_TRANSMIT; trf->iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; break; @@ -821,15 +909,43 @@ err_out: return ret; } +static int trf7970a_is_iso15693_write_or_lock(u8 cmd) +{ + int ret; + + switch (cmd) { + case ISO15693_CMD_WRITE_SINGLE_BLOCK: + case ISO15693_CMD_LOCK_BLOCK: + case ISO15693_CMD_WRITE_MULTIPLE_BLOCK: + case ISO15693_CMD_WRITE_AFI: + case ISO15693_CMD_LOCK_AFI: + case ISO15693_CMD_WRITE_DSFID: + case ISO15693_CMD_LOCK_DSFID: + ret = 1; + break; + default: + ret = 0; + } + + return ret; +} + static int trf7970a_per_cmd_config(struct trf7970a *trf, struct sk_buff *skb) { u8 *req = skb->data; - u8 special_fcn_reg1; + u8 special_fcn_reg1, iso_ctrl; int ret; + trf->issue_eof = false; + /* When issuing Type 2 read command, make sure the '4_bit_RX' bit in * special functions register 1 is cleared; otherwise, its a write or * sector select command and '4_bit_RX' must be set. + * + * When issuing an ISO 15693 command, inspect the flags byte to see + * what speed to use. Also, remember when the OPTION flag is set on + * a Type V write or lock command so the driver will know that it + * has to send an EOF in order to get a response. */ if ((trf->technology == NFC_DIGITAL_RF_TECH_106A) && (trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T)) { @@ -846,6 +962,37 @@ static int trf7970a_per_cmd_config(struct trf7970a *trf, struct sk_buff *skb) trf->special_fcn_reg1 = special_fcn_reg1; } + } else if (trf->technology == NFC_DIGITAL_RF_TECH_ISO15693) { + iso_ctrl = trf->iso_ctrl & ~TRF7970A_ISO_CTRL_RFID_SPEED_MASK; + + switch (req[0] & ISO15693_REQ_FLAG_SPEED_MASK) { + case 0x00: + iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_662; + break; + case ISO15693_REQ_FLAG_SUB_CARRIER: + iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a; + break; + case ISO15693_REQ_FLAG_DATA_RATE: + iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648; + break; + case (ISO15693_REQ_FLAG_SUB_CARRIER | + ISO15693_REQ_FLAG_DATA_RATE): + iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669; + break; + } + + if (iso_ctrl != trf->iso_ctrl) { + ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl); + if (ret) + return ret; + + trf->iso_ctrl = iso_ctrl; + } + + if ((trf->framing == NFC_DIGITAL_FRAMING_ISO15693_TVT) && + trf7970a_is_iso15693_write_or_lock(req[1]) && + (req[0] & ISO15693_REQ_FLAG_OPTION)) + trf->issue_eof = true; } return 0; -- 1.8.3.4 -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
