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path: root/drivers/nfc/pn533.c
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Diffstat (limited to 'drivers/nfc/pn533.c')
-rw-r--r--drivers/nfc/pn533.c85
1 files changed, 72 insertions, 13 deletions
diff --git a/drivers/nfc/pn533.c b/drivers/nfc/pn533.c
index 125d995c11a..ae0fa9ee169 100644
--- a/drivers/nfc/pn533.c
+++ b/drivers/nfc/pn533.c
@@ -84,11 +84,17 @@ MODULE_DEVICE_TABLE(usb, pn533_table);
/* How much time we spend listening for initiators */
#define PN533_LISTEN_TIME 2
-/* Standard pn533 frame definitions */
+/* Standard pn533 frame definitions (standard and extended)*/
#define PN533_STD_FRAME_HEADER_LEN (sizeof(struct pn533_std_frame) \
+ 2) /* data[0] TFI, data[1] CC */
#define PN533_STD_FRAME_TAIL_LEN 2 /* data[len] DCS, data[len + 1] postamble*/
+#define PN533_EXT_FRAME_HEADER_LEN (sizeof(struct pn533_ext_frame) \
+ + 2) /* data[0] TFI, data[1] CC */
+
+#define PN533_CMD_DATAEXCH_DATA_MAXLEN 262
+#define PN533_CMD_DATAFRAME_MAXLEN 240 /* max data length (send) */
+
/*
* Max extended frame payload len, excluding TFI and CC
* which are already in PN533_FRAME_HEADER_LEN.
@@ -99,6 +105,10 @@ MODULE_DEVICE_TABLE(usb, pn533_table);
Postamble (1) */
#define PN533_STD_FRAME_CHECKSUM(f) (f->data[f->datalen])
#define PN533_STD_FRAME_POSTAMBLE(f) (f->data[f->datalen + 1])
+/* Half start code (3), LEN (4) should be 0xffff for extended frame */
+#define PN533_STD_IS_EXTENDED(hdr) ((hdr)->datalen == 0xFF \
+ && (hdr)->datalen_checksum == 0xFF)
+#define PN533_EXT_FRAME_CHECKSUM(f) (f->data[be16_to_cpu(f->datalen)])
/* start of frame */
#define PN533_STD_FRAME_SOF 0x00FF
@@ -124,7 +134,7 @@ MODULE_DEVICE_TABLE(usb, pn533_table);
#define PN533_ACR122_RDR_TO_PC_ESCAPE 0x83
/* PN533 Commands */
-#define PN533_STD_FRAME_CMD(f) (f->data[1])
+#define PN533_FRAME_CMD(f) (f->data[1])
#define PN533_CMD_GET_FIRMWARE_VERSION 0x02
#define PN533_CMD_RF_CONFIGURATION 0x32
@@ -406,6 +416,15 @@ struct pn533_std_frame {
u8 data[];
} __packed;
+struct pn533_ext_frame { /* Extended Information frame */
+ u8 preamble;
+ __be16 start_frame;
+ __be16 eif_flag; /* fixed to 0xFFFF */
+ __be16 datalen;
+ u8 datalen_checksum;
+ u8 data[];
+} __packed;
+
struct pn533_frame_ops {
void (*tx_frame_init)(void *frame, u8 cmd_code);
void (*tx_frame_finish)(void *frame);
@@ -513,7 +532,7 @@ static u8 pn533_acr122_get_cmd_code(void *frame)
{
struct pn533_acr122_rx_frame *f = frame;
- return PN533_STD_FRAME_CMD(f);
+ return PN533_FRAME_CMD(f);
}
static struct pn533_frame_ops pn533_acr122_frame_ops = {
@@ -532,6 +551,12 @@ static struct pn533_frame_ops pn533_acr122_frame_ops = {
.get_cmd_code = pn533_acr122_get_cmd_code,
};
+/* The rule: value(high byte) + value(low byte) + checksum = 0 */
+static inline u8 pn533_ext_checksum(u16 value)
+{
+ return ~(u8)(((value & 0xFF00) >> 8) + (u8)(value & 0xFF)) + 1;
+}
+
/* The rule: value + checksum = 0 */
static inline u8 pn533_std_checksum(u8 value)
{
@@ -557,7 +582,7 @@ static void pn533_std_tx_frame_init(void *_frame, u8 cmd_code)
frame->preamble = 0;
frame->start_frame = cpu_to_be16(PN533_STD_FRAME_SOF);
PN533_STD_FRAME_IDENTIFIER(frame) = PN533_STD_FRAME_DIR_OUT;
- PN533_STD_FRAME_CMD(frame) = cmd_code;
+ PN533_FRAME_CMD(frame) = cmd_code;
frame->datalen = 2;
}
@@ -583,18 +608,35 @@ static void pn533_std_tx_update_payload_len(void *_frame, int len)
static bool pn533_std_rx_frame_is_valid(void *_frame)
{
u8 checksum;
- struct pn533_std_frame *frame = _frame;
+ struct pn533_std_frame *stdf = _frame;
- if (frame->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
+ if (stdf->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
return false;
- checksum = pn533_std_checksum(frame->datalen);
- if (checksum != frame->datalen_checksum)
- return false;
+ if (likely(!PN533_STD_IS_EXTENDED(stdf))) {
+ /* Standard frame code */
- checksum = pn533_std_data_checksum(frame->data, frame->datalen);
- if (checksum != PN533_STD_FRAME_CHECKSUM(frame))
- return false;
+ checksum = pn533_std_checksum(stdf->datalen);
+ if (checksum != stdf->datalen_checksum)
+ return false;
+
+ checksum = pn533_std_data_checksum(stdf->data, stdf->datalen);
+ if (checksum != PN533_STD_FRAME_CHECKSUM(stdf))
+ return false;
+ } else {
+ /* Extended */
+ struct pn533_ext_frame *eif = _frame;
+
+ checksum = pn533_ext_checksum(be16_to_cpu(eif->datalen));
+ if (checksum != eif->datalen_checksum)
+ return false;
+
+ /* check data checksum */
+ checksum = pn533_std_data_checksum(eif->data,
+ be16_to_cpu(eif->datalen));
+ if (checksum != PN533_EXT_FRAME_CHECKSUM(eif))
+ return false;
+ }
return true;
}
@@ -614,6 +656,14 @@ static inline int pn533_std_rx_frame_size(void *frame)
{
struct pn533_std_frame *f = frame;
+ /* check for Extended Information frame */
+ if (PN533_STD_IS_EXTENDED(f)) {
+ struct pn533_ext_frame *eif = frame;
+
+ return sizeof(struct pn533_ext_frame)
+ + be16_to_cpu(eif->datalen) + PN533_STD_FRAME_TAIL_LEN;
+ }
+
return sizeof(struct pn533_std_frame) + f->datalen +
PN533_STD_FRAME_TAIL_LEN;
}
@@ -621,8 +671,12 @@ static inline int pn533_std_rx_frame_size(void *frame)
static u8 pn533_std_get_cmd_code(void *frame)
{
struct pn533_std_frame *f = frame;
+ struct pn533_ext_frame *eif = frame;
- return PN533_STD_FRAME_CMD(f);
+ if (PN533_STD_IS_EXTENDED(f))
+ return PN533_FRAME_CMD(eif);
+ else
+ return PN533_FRAME_CMD(f);
}
static struct pn533_frame_ops pn533_std_frame_ops = {
@@ -690,6 +744,11 @@ static void pn533_recv_response(struct urb *urb)
goto sched_wq;
}
+ if (PN533_STD_IS_EXTENDED((struct pn533_std_frame *)in_frame))
+ dev->ops->rx_header_len = PN533_EXT_FRAME_HEADER_LEN;
+ else
+ dev->ops->rx_header_len = PN533_STD_FRAME_HEADER_LEN;
+
sched_wq:
queue_work(dev->wq, &dev->cmd_complete_work);
}