NFC: pn533: Introduce ops for frame logic
Encapsulate whole frame logic (tx/rx frame structure and size) inside the ops structure to make the core driver generic for devices which handle frames in non standard menner (different then pn533 spec say). Signed-off-by: Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Waldemar Rymarkiewicz
Samuel Ortiz
Родитель
16f7541914
Коммит
9e2d493e74
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@ -79,9 +79,6 @@ MODULE_DEVICE_TABLE(usb, pn533_table);
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#define PN533_LISTEN_TIME 2
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/* frame definitions */
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#define PN533_NORMAL_FRAME_MAX_LEN 262 /* 6 (PREAMBLE, SOF, LEN, LCS, TFI)
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254 (DATA)
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2 (DCS, postamble) */
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#define PN533_FRAME_HEADER_LEN (sizeof(struct pn533_frame) \
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+ 2) /* data[0] TFI, data[1] CC */
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#define PN533_FRAME_TAIL_LEN 2 /* data[len] DCS, data[len + 1] postamble*/
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@ -92,8 +89,6 @@ MODULE_DEVICE_TABLE(usb, pn533_table);
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*/
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#define PN533_FRAME_MAX_PAYLOAD_LEN 263
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#define PN533_FRAME_SIZE(f) (sizeof(struct pn533_frame) + f->datalen + \
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PN533_FRAME_TAIL_LEN)
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#define PN533_FRAME_ACK_SIZE 6 /* Preamble (1), SoPC (2), ACK Code (2),
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Postamble (1) */
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#define PN533_FRAME_CHECKSUM(f) (f->data[f->datalen])
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@ -361,6 +356,8 @@ struct pn533 {
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struct list_head cmd_queue;
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u8 cmd_pending;
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struct pn533_frame_ops *ops;
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};
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struct pn533_cmd {
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@ -368,6 +365,7 @@ struct pn533_cmd {
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u8 cmd_code;
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struct sk_buff *req;
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struct sk_buff *resp;
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int resp_len;
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void *arg;
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};
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@ -379,6 +377,22 @@ struct pn533_frame {
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u8 data[];
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} __packed;
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struct pn533_frame_ops {
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void (*tx_frame_init)(void *frame, u8 cmd_code);
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void (*tx_frame_finish)(void *frame);
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void (*tx_update_payload_len)(void *frame, int len);
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int tx_header_len;
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int tx_tail_len;
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bool (*rx_is_frame_valid)(void *frame);
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int (*rx_frame_size)(void *frame);
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int rx_header_len;
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int rx_tail_len;
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int max_payload_len;
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u8 (*get_cmd_code)(void *frame);
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};
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/* The rule: value + checksum = 0 */
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static inline u8 pn533_checksum(u8 value)
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{
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@ -397,17 +411,21 @@ static u8 pn533_data_checksum(u8 *data, int datalen)
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return pn533_checksum(sum);
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}
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static void pn533_tx_frame_init(struct pn533_frame *frame, u8 cmd)
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static void pn533_tx_frame_init(void *_frame, u8 cmd_code)
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{
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struct pn533_frame *frame = _frame;
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frame->preamble = 0;
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frame->start_frame = cpu_to_be16(PN533_SOF);
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PN533_FRAME_IDENTIFIER(frame) = PN533_DIR_OUT;
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PN533_FRAME_CMD(frame) = cmd;
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PN533_FRAME_CMD(frame) = cmd_code;
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frame->datalen = 2;
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}
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static void pn533_tx_frame_finish(struct pn533_frame *frame)
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static void pn533_tx_frame_finish(void *_frame)
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{
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struct pn533_frame *frame = _frame;
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frame->datalen_checksum = pn533_checksum(frame->datalen);
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PN533_FRAME_CHECKSUM(frame) =
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@ -416,9 +434,17 @@ static void pn533_tx_frame_finish(struct pn533_frame *frame)
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PN533_FRAME_POSTAMBLE(frame) = 0;
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}
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static bool pn533_rx_frame_is_valid(struct pn533_frame *frame)
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static void pn533_tx_update_payload_len(void *_frame, int len)
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{
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struct pn533_frame *frame = _frame;
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frame->datalen += len;
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}
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static bool pn533_rx_frame_is_valid(void *_frame)
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{
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u8 checksum;
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struct pn533_frame *frame = _frame;
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if (frame->start_frame != cpu_to_be16(PN533_SOF))
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return false;
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@ -445,9 +471,39 @@ static bool pn533_rx_frame_is_ack(struct pn533_frame *frame)
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return true;
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}
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static bool pn533_rx_frame_is_cmd_response(struct pn533_frame *frame, u8 cmd)
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static inline int pn533_rx_frame_size(void *frame)
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{
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return (PN533_FRAME_CMD(frame) == PN533_CMD_RESPONSE(cmd));
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struct pn533_frame *f = frame;
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return sizeof(struct pn533_frame) + f->datalen + PN533_FRAME_TAIL_LEN;
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}
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static u8 pn533_get_cmd_code(void *frame)
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{
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struct pn533_frame *f = frame;
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return PN533_FRAME_CMD(f);
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}
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struct pn533_frame_ops pn533_std_frame_ops = {
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.tx_frame_init = pn533_tx_frame_init,
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.tx_frame_finish = pn533_tx_frame_finish,
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.tx_update_payload_len = pn533_tx_update_payload_len,
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.tx_header_len = PN533_FRAME_HEADER_LEN,
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.tx_tail_len = PN533_FRAME_TAIL_LEN,
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.rx_is_frame_valid = pn533_rx_frame_is_valid,
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.rx_frame_size = pn533_rx_frame_size,
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.rx_header_len = PN533_FRAME_HEADER_LEN,
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.rx_tail_len = PN533_FRAME_TAIL_LEN,
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.max_payload_len = PN533_FRAME_MAX_PAYLOAD_LEN,
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.get_cmd_code = pn533_get_cmd_code,
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};
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static bool pn533_rx_frame_is_cmd_response(struct pn533 *dev, void *frame)
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{
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return (dev->ops->get_cmd_code(frame) == PN533_CMD_RESPONSE(dev->cmd));
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}
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@ -464,7 +520,7 @@ static void pn533_wq_cmd_complete(struct work_struct *work)
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static void pn533_recv_response(struct urb *urb)
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{
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struct pn533 *dev = urb->context;
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struct pn533_frame *in_frame;
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u8 *in_frame;
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switch (urb->status) {
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case 0:
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@ -489,15 +545,15 @@ static void pn533_recv_response(struct urb *urb)
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nfc_dev_dbg(&dev->interface->dev, "Received a frame.");
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print_hex_dump(KERN_DEBUG, "PN533 RX: ", DUMP_PREFIX_NONE, 16, 1,
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in_frame, PN533_FRAME_SIZE(in_frame), false);
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in_frame, dev->ops->rx_frame_size(in_frame), false);
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if (!pn533_rx_frame_is_valid(in_frame)) {
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if (!dev->ops->rx_is_frame_valid(in_frame)) {
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nfc_dev_err(&dev->interface->dev, "Received an invalid frame");
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dev->wq_in_error = -EIO;
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goto sched_wq;
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}
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if (!pn533_rx_frame_is_cmd_response(in_frame, dev->cmd)) {
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if (!pn533_rx_frame_is_cmd_response(dev, in_frame)) {
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nfc_dev_err(&dev->interface->dev,
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"It it not the response to the last command");
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dev->wq_in_error = -EIO;
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@ -595,7 +651,7 @@ static int __pn533_send_frame_async(struct pn533 *dev,
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{
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int rc;
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dev->cmd = PN533_FRAME_CMD(((struct pn533_frame *)out->data));
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dev->cmd = dev->ops->get_cmd_code(out->data);
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dev->cmd_complete = cmd_complete;
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dev->cmd_complete_arg = arg;
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@ -623,20 +679,20 @@ error:
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return rc;
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}
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static void pn533_build_cmd_frame(u8 cmd_code, struct sk_buff *skb)
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static void pn533_build_cmd_frame(struct pn533 *dev, u8 cmd_code,
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struct sk_buff *skb)
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{
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struct pn533_frame *frame;
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/* payload is already there, just update datalen */
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int payload_len = skb->len;
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struct pn533_frame_ops *ops = dev->ops;
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skb_push(skb, PN533_FRAME_HEADER_LEN);
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skb_put(skb, PN533_FRAME_TAIL_LEN);
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frame = (struct pn533_frame *)skb->data;
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skb_push(skb, ops->tx_header_len);
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skb_put(skb, ops->tx_tail_len);
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pn533_tx_frame_init(frame, cmd_code);
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frame->datalen += payload_len;
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pn533_tx_frame_finish(frame);
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ops->tx_frame_init(skb->data, cmd_code);
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ops->tx_update_payload_len(skb->data, payload_len);
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ops->tx_frame_finish(skb->data);
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}
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struct pn533_send_async_complete_arg {
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@ -653,7 +709,6 @@ static int pn533_send_async_complete(struct pn533 *dev, void *_arg, int status)
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struct sk_buff *req = arg->req;
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struct sk_buff *resp = arg->resp;
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struct pn533_frame *frame = (struct pn533_frame *)resp->data;
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int rc;
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dev_kfree_skb(req);
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@ -666,9 +721,9 @@ static int pn533_send_async_complete(struct pn533 *dev, void *_arg, int status)
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return status;
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}
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skb_put(resp, PN533_FRAME_SIZE(frame));
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skb_pull(resp, PN533_FRAME_HEADER_LEN);
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skb_trim(resp, resp->len - PN533_FRAME_TAIL_LEN);
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skb_put(resp, dev->ops->rx_frame_size(resp->data));
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skb_pull(resp, dev->ops->rx_header_len);
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skb_trim(resp, resp->len - dev->ops->rx_tail_len);
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rc = arg->complete_cb(dev, arg->complete_cb_context, resp);
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@ -697,7 +752,7 @@ static int __pn533_send_async(struct pn533 *dev, u8 cmd_code,
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arg->resp = resp;
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arg->req = req;
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pn533_build_cmd_frame(cmd_code, req);
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pn533_build_cmd_frame(dev, cmd_code, req);
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mutex_lock(&dev->cmd_lock);
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@ -724,6 +779,7 @@ static int __pn533_send_async(struct pn533 *dev, u8 cmd_code,
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cmd->cmd_code = cmd_code;
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cmd->req = req;
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cmd->resp = resp;
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cmd->resp_len = resp_len;
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cmd->arg = arg;
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list_add_tail(&cmd->queue, &dev->cmd_queue);
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@ -744,9 +800,9 @@ static int pn533_send_data_async(struct pn533 *dev, u8 cmd_code,
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{
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struct sk_buff *resp;
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int rc;
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int resp_len = PN533_FRAME_HEADER_LEN +
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PN533_FRAME_MAX_PAYLOAD_LEN +
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PN533_FRAME_TAIL_LEN;
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int resp_len = dev->ops->rx_header_len +
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dev->ops->max_payload_len +
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dev->ops->rx_tail_len;
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resp = nfc_alloc_recv_skb(resp_len, GFP_KERNEL);
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if (!resp)
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@ -767,14 +823,16 @@ static int pn533_send_cmd_async(struct pn533 *dev, u8 cmd_code,
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{
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struct sk_buff *resp;
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int rc;
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int resp_len = dev->ops->rx_header_len +
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dev->ops->max_payload_len +
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dev->ops->rx_tail_len;
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resp = alloc_skb(PN533_NORMAL_FRAME_MAX_LEN, GFP_KERNEL);
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resp = alloc_skb(resp_len, GFP_KERNEL);
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if (!resp)
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return -ENOMEM;
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rc = __pn533_send_async(dev, cmd_code, req, resp,
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PN533_NORMAL_FRAME_MAX_LEN,
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complete_cb, complete_cb_context);
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rc = __pn533_send_async(dev, cmd_code, req, resp, resp_len, complete_cb,
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complete_cb_context);
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if (rc)
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dev_kfree_skb(resp);
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@ -797,9 +855,9 @@ static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code,
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struct pn533_send_async_complete_arg *arg;
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struct sk_buff *resp;
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int rc;
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int resp_len = PN533_FRAME_HEADER_LEN +
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PN533_FRAME_MAX_PAYLOAD_LEN +
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PN533_FRAME_TAIL_LEN;
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int resp_len = dev->ops->rx_header_len +
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dev->ops->max_payload_len +
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dev->ops->rx_tail_len;
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resp = alloc_skb(resp_len, GFP_KERNEL);
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if (!resp)
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@ -816,7 +874,7 @@ static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code,
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arg->resp = resp;
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arg->req = req;
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pn533_build_cmd_frame(cmd_code, req);
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pn533_build_cmd_frame(dev, cmd_code, req);
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rc = __pn533_send_frame_async(dev, req, resp, resp_len,
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pn533_send_async_complete, arg);
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@ -847,10 +905,8 @@ static void pn533_wq_cmd(struct work_struct *work)
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mutex_unlock(&dev->cmd_lock);
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__pn533_send_frame_async(dev, cmd->req, cmd->resp,
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PN533_NORMAL_FRAME_MAX_LEN,
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pn533_send_async_complete,
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cmd->arg);
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__pn533_send_frame_async(dev, cmd->req, cmd->resp, cmd->resp_len,
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pn533_send_async_complete, cmd->arg);
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kfree(cmd);
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}
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@ -928,16 +984,16 @@ static void pn533_send_complete(struct urb *urb)
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}
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}
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static struct sk_buff *pn533_alloc_skb(unsigned int size)
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static struct sk_buff *pn533_alloc_skb(struct pn533 *dev, unsigned int size)
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{
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struct sk_buff *skb;
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skb = alloc_skb(PN533_FRAME_HEADER_LEN +
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skb = alloc_skb(dev->ops->tx_header_len +
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size +
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PN533_FRAME_TAIL_LEN, GFP_KERNEL);
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dev->ops->tx_tail_len, GFP_KERNEL);
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if (skb)
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skb_reserve(skb, PN533_FRAME_HEADER_LEN);
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skb_reserve(skb, dev->ops->tx_header_len);
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return skb;
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}
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@ -1297,11 +1353,14 @@ static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp)
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return -EAGAIN;
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}
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static struct sk_buff *pn533_alloc_poll_tg_frame(u8 *gbytes, size_t gbytes_len)
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static struct sk_buff *pn533_alloc_poll_tg_frame(struct pn533 *dev)
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{
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struct sk_buff *skb;
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u8 *felica, *nfcid3, *gb;
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u8 *gbytes = dev->gb;
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size_t gbytes_len = dev->gb_len;
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u8 felica_params[18] = {0x1, 0xfe, /* DEP */
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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@ -1316,7 +1375,7 @@ static struct sk_buff *pn533_alloc_poll_tg_frame(u8 *gbytes, size_t gbytes_len)
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gbytes_len +
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1; /* len Tk*/
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skb = pn533_alloc_skb(skb_len);
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skb = pn533_alloc_skb(dev, skb_len);
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if (!skb)
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return NULL;
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@ -1382,7 +1441,7 @@ static void pn533_wq_tg_get_data(struct work_struct *work)
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nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
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skb = pn533_alloc_skb(0);
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skb = pn533_alloc_skb(dev, 0);
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if (!skb)
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return;
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@ -1507,12 +1566,12 @@ stop_poll:
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return rc;
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}
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static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533_poll_modulations
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*mod)
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static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533 *dev,
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struct pn533_poll_modulations *mod)
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{
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struct sk_buff *skb;
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skb = pn533_alloc_skb(mod->len);
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skb = pn533_alloc_skb(dev, mod->len);
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if (!skb)
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return NULL;
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@ -1535,10 +1594,10 @@ static int pn533_send_poll_frame(struct pn533 *dev)
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if (mod->len == 0) { /* Listen mode */
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cmd_code = PN533_CMD_TG_INIT_AS_TARGET;
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skb = pn533_alloc_poll_tg_frame(dev->gb, dev->gb_len);
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skb = pn533_alloc_poll_tg_frame(dev);
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||||
} else { /* Polling mode */
|
||||
cmd_code = PN533_CMD_IN_LIST_PASSIVE_TARGET;
|
||||
skb = pn533_alloc_poll_in_frame(mod);
|
||||
skb = pn533_alloc_poll_in_frame(dev, mod);
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}
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||||
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if (!skb) {
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@ -1652,7 +1711,7 @@ static int pn533_activate_target_nfcdep(struct pn533 *dev)
|
|||
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||||
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
|
||||
|
||||
skb = pn533_alloc_skb(sizeof(u8) * 2); /*TG + Next*/
|
||||
skb = pn533_alloc_skb(dev, sizeof(u8) * 2); /*TG + Next*/
|
||||
if (!skb)
|
||||
return -ENOMEM;
|
||||
|
||||
|
|
@ -1746,7 +1805,7 @@ static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
|
|||
dev->tgt_active_prot = 0;
|
||||
skb_queue_purge(&dev->resp_q);
|
||||
|
||||
skb = pn533_alloc_skb(sizeof(u8));
|
||||
skb = pn533_alloc_skb(dev, sizeof(u8));
|
||||
if (!skb)
|
||||
return;
|
||||
|
||||
|
|
@ -1877,7 +1936,7 @@ static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
|
|||
if (comm_mode == NFC_COMM_PASSIVE)
|
||||
skb_len += PASSIVE_DATA_LEN;
|
||||
|
||||
skb = pn533_alloc_skb(skb_len);
|
||||
skb = pn533_alloc_skb(dev, skb_len);
|
||||
if (!skb)
|
||||
return -ENOMEM;
|
||||
|
||||
|
|
@ -2161,7 +2220,7 @@ static void pn533_wq_mi_recv(struct work_struct *work)
|
|||
|
||||
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
|
||||
|
||||
skb = pn533_alloc_skb(PN533_CMD_DATAEXCH_HEAD_LEN);
|
||||
skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN);
|
||||
if (!skb)
|
||||
goto error;
|
||||
|
||||
|
|
@ -2214,7 +2273,7 @@ static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
|
|||
|
||||
skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
|
||||
|
||||
skb = pn533_alloc_skb(skb_len);
|
||||
skb = pn533_alloc_skb(dev, skb_len);
|
||||
if (!skb)
|
||||
return -ENOMEM;
|
||||
|
||||
|
|
@ -2235,7 +2294,7 @@ static int pn533_get_firmware_version(struct pn533 *dev,
|
|||
struct sk_buff *skb;
|
||||
struct sk_buff *resp;
|
||||
|
||||
skb = pn533_alloc_skb(0);
|
||||
skb = pn533_alloc_skb(dev, 0);
|
||||
if (!skb)
|
||||
return -ENOMEM;
|
||||
|
||||
|
|
@ -2259,7 +2318,7 @@ static int pn533_fw_reset(struct pn533 *dev)
|
|||
|
||||
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
|
||||
|
||||
skb = pn533_alloc_skb(sizeof(u8));
|
||||
skb = pn533_alloc_skb(dev, sizeof(u8));
|
||||
if (!skb)
|
||||
return -ENOMEM;
|
||||
|
||||
|
|
@ -2436,14 +2495,7 @@ static int pn533_probe(struct usb_interface *interface,
|
|||
|
||||
usb_set_intfdata(interface, dev);
|
||||
|
||||
memset(&fw_ver, 0, sizeof(fw_ver));
|
||||
rc = pn533_get_firmware_version(dev, &fw_ver);
|
||||
if (rc < 0)
|
||||
goto destroy_wq;
|
||||
|
||||
nfc_dev_info(&dev->interface->dev,
|
||||
"NXP PN533 firmware ver %d.%d now attached",
|
||||
fw_ver.ver, fw_ver.rev);
|
||||
dev->ops = &pn533_std_frame_ops;
|
||||
|
||||
dev->device_type = id->driver_info;
|
||||
switch (dev->device_type) {
|
||||
|
|
@ -2462,10 +2514,20 @@ static int pn533_probe(struct usb_interface *interface,
|
|||
goto destroy_wq;
|
||||
}
|
||||
|
||||
memset(&fw_ver, 0, sizeof(fw_ver));
|
||||
rc = pn533_get_firmware_version(dev, &fw_ver);
|
||||
if (rc < 0)
|
||||
goto destroy_wq;
|
||||
|
||||
nfc_dev_info(&dev->interface->dev,
|
||||
"NXP PN533 firmware ver %d.%d now attached",
|
||||
fw_ver.ver, fw_ver.rev);
|
||||
|
||||
|
||||
dev->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
|
||||
PN533_FRAME_HEADER_LEN +
|
||||
dev->ops->tx_header_len +
|
||||
PN533_CMD_DATAEXCH_HEAD_LEN,
|
||||
PN533_FRAME_TAIL_LEN);
|
||||
dev->ops->tx_tail_len);
|
||||
if (!dev->nfc_dev)
|
||||
goto destroy_wq;
|
||||
|
||||
|
|
|
|||
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