diff options
Diffstat (limited to 'drivers/nfc')
| -rw-r--r-- | drivers/nfc/pn533.c | 121 |
1 files changed, 61 insertions, 60 deletions
diff --git a/drivers/nfc/pn533.c b/drivers/nfc/pn533.c index 73d39f3fbdf9..8e809e083c33 100644 --- a/drivers/nfc/pn533.c +++ b/drivers/nfc/pn533.c @@ -78,32 +78,32 @@ MODULE_DEVICE_TABLE(usb, pn533_table); /* How much time we spend listening for initiators */ #define PN533_LISTEN_TIME 2 -/* frame definitions */ -#define PN533_FRAME_HEADER_LEN (sizeof(struct pn533_frame) \ +/* Standard pn533 frame definitions */ +#define PN533_STD_FRAME_HEADER_LEN (sizeof(struct pn533_std_frame) \ + 2) /* data[0] TFI, data[1] CC */ -#define PN533_FRAME_TAIL_LEN 2 /* data[len] DCS, data[len + 1] postamble*/ +#define PN533_STD_FRAME_TAIL_LEN 2 /* data[len] DCS, data[len + 1] postamble*/ /* * Max extended frame payload len, excluding TFI and CC * which are already in PN533_FRAME_HEADER_LEN. */ -#define PN533_FRAME_MAX_PAYLOAD_LEN 263 +#define PN533_STD_FRAME_MAX_PAYLOAD_LEN 263 -#define PN533_FRAME_ACK_SIZE 6 /* Preamble (1), SoPC (2), ACK Code (2), +#define PN533_STD_FRAME_ACK_SIZE 6 /* Preamble (1), SoPC (2), ACK Code (2), Postamble (1) */ -#define PN533_FRAME_CHECKSUM(f) (f->data[f->datalen]) -#define PN533_FRAME_POSTAMBLE(f) (f->data[f->datalen + 1]) +#define PN533_STD_FRAME_CHECKSUM(f) (f->data[f->datalen]) +#define PN533_STD_FRAME_POSTAMBLE(f) (f->data[f->datalen + 1]) /* start of frame */ -#define PN533_SOF 0x00FF +#define PN533_STD_FRAME_SOF 0x00FF -/* frame identifier: in/out/error */ -#define PN533_FRAME_IDENTIFIER(f) (f->data[0]) -#define PN533_DIR_OUT 0xD4 -#define PN533_DIR_IN 0xD5 +/* standard frame identifier: in/out/error */ +#define PN533_STD_FRAME_IDENTIFIER(f) (f->data[0]) /* TFI */ +#define PN533_STD_FRAME_DIR_OUT 0xD4 +#define PN533_STD_FRAME_DIR_IN 0xD5 /* PN533 Commands */ -#define PN533_FRAME_CMD(f) (f->data[1]) +#define PN533_STD_FRAME_CMD(f) (f->data[1]) #define PN533_CMD_GET_FIRMWARE_VERSION 0x02 #define PN533_CMD_RF_CONFIGURATION 0x32 @@ -369,7 +369,7 @@ struct pn533_cmd { void *arg; }; -struct pn533_frame { +struct pn533_std_frame { u8 preamble; __be16 start_frame; u8 datalen; @@ -394,13 +394,13 @@ struct pn533_frame_ops { }; /* The rule: value + checksum = 0 */ -static inline u8 pn533_checksum(u8 value) +static inline u8 pn533_std_checksum(u8 value) { return ~value + 1; } /* The rule: sum(data elements) + checksum = 0 */ -static u8 pn533_data_checksum(u8 *data, int datalen) +static u8 pn533_std_data_checksum(u8 *data, int datalen) { u8 sum = 0; int i; @@ -408,61 +408,61 @@ static u8 pn533_data_checksum(u8 *data, int datalen) for (i = 0; i < datalen; i++) sum += data[i]; - return pn533_checksum(sum); + return pn533_std_checksum(sum); } -static void pn533_tx_frame_init(void *_frame, u8 cmd_code) +static void pn533_std_tx_frame_init(void *_frame, u8 cmd_code) { - struct pn533_frame *frame = _frame; + struct pn533_std_frame *frame = _frame; frame->preamble = 0; - frame->start_frame = cpu_to_be16(PN533_SOF); - PN533_FRAME_IDENTIFIER(frame) = PN533_DIR_OUT; - PN533_FRAME_CMD(frame) = cmd_code; + 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; frame->datalen = 2; } -static void pn533_tx_frame_finish(void *_frame) +static void pn533_std_tx_frame_finish(void *_frame) { - struct pn533_frame *frame = _frame; + struct pn533_std_frame *frame = _frame; - frame->datalen_checksum = pn533_checksum(frame->datalen); + frame->datalen_checksum = pn533_std_checksum(frame->datalen); - PN533_FRAME_CHECKSUM(frame) = - pn533_data_checksum(frame->data, frame->datalen); + PN533_STD_FRAME_CHECKSUM(frame) = + pn533_std_data_checksum(frame->data, frame->datalen); - PN533_FRAME_POSTAMBLE(frame) = 0; + PN533_STD_FRAME_POSTAMBLE(frame) = 0; } -static void pn533_tx_update_payload_len(void *_frame, int len) +static void pn533_std_tx_update_payload_len(void *_frame, int len) { - struct pn533_frame *frame = _frame; + struct pn533_std_frame *frame = _frame; frame->datalen += len; } -static bool pn533_rx_frame_is_valid(void *_frame) +static bool pn533_std_rx_frame_is_valid(void *_frame) { u8 checksum; - struct pn533_frame *frame = _frame; + struct pn533_std_frame *frame = _frame; - if (frame->start_frame != cpu_to_be16(PN533_SOF)) + if (frame->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF)) return false; - checksum = pn533_checksum(frame->datalen); + checksum = pn533_std_checksum(frame->datalen); if (checksum != frame->datalen_checksum) return false; - checksum = pn533_data_checksum(frame->data, frame->datalen); - if (checksum != PN533_FRAME_CHECKSUM(frame)) + checksum = pn533_std_data_checksum(frame->data, frame->datalen); + if (checksum != PN533_STD_FRAME_CHECKSUM(frame)) return false; return true; } -static bool pn533_rx_frame_is_ack(struct pn533_frame *frame) +static bool pn533_std_rx_frame_is_ack(struct pn533_std_frame *frame) { - if (frame->start_frame != cpu_to_be16(PN533_SOF)) + if (frame->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF)) return false; if (frame->datalen != 0 || frame->datalen_checksum != 0xFF) @@ -471,34 +471,35 @@ static bool pn533_rx_frame_is_ack(struct pn533_frame *frame) return true; } -static inline int pn533_rx_frame_size(void *frame) +static inline int pn533_std_rx_frame_size(void *frame) { - struct pn533_frame *f = frame; + struct pn533_std_frame *f = frame; - return sizeof(struct pn533_frame) + f->datalen + PN533_FRAME_TAIL_LEN; + return sizeof(struct pn533_std_frame) + f->datalen + + PN533_STD_FRAME_TAIL_LEN; } -static u8 pn533_get_cmd_code(void *frame) +static u8 pn533_std_get_cmd_code(void *frame) { - struct pn533_frame *f = frame; + struct pn533_std_frame *f = frame; - return PN533_FRAME_CMD(f); + return PN533_STD_FRAME_CMD(f); } static struct pn533_frame_ops pn533_std_frame_ops = { - .tx_frame_init = pn533_tx_frame_init, - .tx_frame_finish = pn533_tx_frame_finish, - .tx_update_payload_len = pn533_tx_update_payload_len, - .tx_header_len = PN533_FRAME_HEADER_LEN, - .tx_tail_len = PN533_FRAME_TAIL_LEN, - - .rx_is_frame_valid = pn533_rx_frame_is_valid, - .rx_frame_size = pn533_rx_frame_size, - .rx_header_len = PN533_FRAME_HEADER_LEN, - .rx_tail_len = PN533_FRAME_TAIL_LEN, - - .max_payload_len = PN533_FRAME_MAX_PAYLOAD_LEN, - .get_cmd_code = pn533_get_cmd_code, + .tx_frame_init = pn533_std_tx_frame_init, + .tx_frame_finish = pn533_std_tx_frame_finish, + .tx_update_payload_len = pn533_std_tx_update_payload_len, + .tx_header_len = PN533_STD_FRAME_HEADER_LEN, + .tx_tail_len = PN533_STD_FRAME_TAIL_LEN, + + .rx_is_frame_valid = pn533_std_rx_frame_is_valid, + .rx_frame_size = pn533_std_rx_frame_size, + .rx_header_len = PN533_STD_FRAME_HEADER_LEN, + .rx_tail_len = PN533_STD_FRAME_TAIL_LEN, + + .max_payload_len = PN533_STD_FRAME_MAX_PAYLOAD_LEN, + .get_cmd_code = pn533_std_get_cmd_code, }; static bool pn533_rx_frame_is_cmd_response(struct pn533 *dev, void *frame) @@ -575,7 +576,7 @@ static int pn533_submit_urb_for_response(struct pn533 *dev, gfp_t flags) static void pn533_recv_ack(struct urb *urb) { struct pn533 *dev = urb->context; - struct pn533_frame *in_frame; + struct pn533_std_frame *in_frame; int rc; switch (urb->status) { @@ -598,7 +599,7 @@ static void pn533_recv_ack(struct urb *urb) in_frame = dev->in_urb->transfer_buffer; - if (!pn533_rx_frame_is_ack(in_frame)) { + if (!pn533_std_rx_frame_is_ack(in_frame)) { nfc_dev_err(&dev->interface->dev, "Received an invalid ack"); dev->wq_in_error = -EIO; goto sched_wq; @@ -627,7 +628,7 @@ static int pn533_submit_urb_for_ack(struct pn533 *dev, gfp_t flags) static int pn533_send_ack(struct pn533 *dev, gfp_t flags) { - u8 ack[PN533_FRAME_ACK_SIZE] = {0x00, 0x00, 0xff, 0x00, 0xff, 0x00}; + u8 ack[PN533_STD_FRAME_ACK_SIZE] = {0x00, 0x00, 0xff, 0x00, 0xff, 0x00}; /* spec 7.1.1.3: Preamble, SoPC (2), ACK Code (2), Postamble */ int rc; 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