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NFC: trf7970a: Add ISO/IEC 15693 and Type 5 tag Support 

Add support for ISO/IEC 15693 RF technology and Type 5 tags.
Note that Type 5 tags used to be referred to as Type V tags.

CC: Erick Macias <emacias@ti.com>
CC: Felipe Balbi <balbi@ti.com>
Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Mark A. Greer 2014-03-10 11:56:24 -07:00 committed by Samuel Ortiz
parent 8006289108
commit 9d9304b321
1 changed files with 148 additions and 4 deletions
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152
drivers/nfc/trf7970a.c
View File

@ -85,10 +85,26 @@
* 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, 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 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 | NFC_PROTO_ISO14443_MASK)
(NFC_PROTO_MIFARE_MASK | NFC_PROTO_ISO14443_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
@ -106,6 +122,7 @@
#define TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT 5
#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
@ -265,6 +282,36 @@
/* 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,
@ -272,6 +319,7 @@ 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
};
@ -293,6 +341,7 @@ struct trf7970a {
int technology;
int framing;
u8 tx_cmd;
bool issue_eof;
int en2_gpio;
int en_gpio;
struct mutex lock;
@ -454,8 +503,13 @@ 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,
@ -631,6 +685,10 @@ static irqreturn_t trf7970a_irq(int irq, void *dev_id)
trf7970a_send_err_upstream(trf, -EIO);
}
break;
case TRF7970A_ST_WAIT_TO_ISSUE_EOF:
if (status != TRF7970A_IRQ_STATUS_TX)
trf7970a_send_err_upstream(trf, -EIO);
break;
default:
dev_err(trf->dev, "%s - Driver in invalid state: %d\n",
__func__, trf->state);
@ -640,6 +698,29 @@ 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_send_err_upstream(trf, ret);
ret = trf7970a_cmd(trf, TRF7970A_CMD_EOF);
if (ret)
trf7970a_send_err_upstream(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,
@ -654,6 +735,8 @@ 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_send_err_upstream(trf, -ETIMEDOUT);
@ -801,6 +884,9 @@ 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;
@ -823,6 +909,8 @@ static int trf7970a_config_framing(struct trf7970a *trf, int framing)
break;
case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A:
case NFC_DIGITAL_FRAMING_NFCA_T4T:
case NFC_DIGITAL_FRAMING_ISO15693_INVENTORY:
case NFC_DIGITAL_FRAMING_ISO15693_T5T:
trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
trf->iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N;
break;
@ -873,15 +961,39 @@ err_out:
return ret;
}
static int trf7970a_is_iso15693_write_or_lock(u8 cmd)
{
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:
return 1;
break;
default:
return 0;
}
}
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 if the OPTION flag is set on
* a Type 5 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)) {
@ -898,6 +1010,37 @@ 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_T5T) &&
trf7970a_is_iso15693_write_or_lock(req[1]) &&
(req[0] & ISO15693_REQ_FLAG_OPTION))
trf->issue_eof = true;
}
return 0;
@ -1185,6 +1328,7 @@ static int trf7970a_remove(struct spi_device *spi)
case TRF7970A_ST_WAIT_FOR_TX_FIFO:
case TRF7970A_ST_WAIT_FOR_RX_DATA:
case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT:
case TRF7970A_ST_WAIT_TO_ISSUE_EOF:
trf7970a_send_err_upstream(trf, -ECANCELED);
break;
default: