NFC: Implement pn533 polling loop
After going through all the modulations, the pn533 driver spends 2 seconds listening for targets. Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Samuel Ortiz
parent
51d9e803b9
commit
6fbbdc16be
@ -45,6 +45,9 @@ static const struct usb_device_id pn533_table[] = {
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};
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MODULE_DEVICE_TABLE(usb, pn533_table);
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/* How much time we spend listening for initiators */
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#define PN533_LISTEN_TIME 2
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/* frame definitions */
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#define PN533_FRAME_TAIL_SIZE 2
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#define PN533_FRAME_SIZE(f) (sizeof(struct pn533_frame) + f->datalen + \
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@ -163,6 +166,7 @@ enum {
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PN533_POLL_MOD_424KBPS_FELICA,
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PN533_POLL_MOD_106KBPS_JEWEL,
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PN533_POLL_MOD_847KBPS_B,
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PN533_LISTEN_MOD,
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__PN533_POLL_MOD_AFTER_LAST,
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};
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@ -230,6 +234,9 @@ const struct pn533_poll_modulations poll_mod[] = {
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},
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.len = 3,
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},
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[PN533_LISTEN_MOD] = {
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.len = 0,
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},
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};
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/* PN533_CMD_IN_ATR */
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@ -312,10 +319,13 @@ struct pn533 {
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struct workqueue_struct *wq;
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struct work_struct cmd_work;
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struct work_struct poll_work;
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struct work_struct mi_work;
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struct work_struct tg_work;
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struct timer_list listen_timer;
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struct pn533_frame *wq_in_frame;
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int wq_in_error;
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int cancel_listen;
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pn533_cmd_complete_t cmd_complete;
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void *cmd_complete_arg;
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@ -326,6 +336,10 @@ struct pn533 {
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u8 poll_mod_count;
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u8 poll_mod_curr;
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u32 poll_protocols;
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u32 listen_protocols;
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u8 *gb;
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size_t gb_len;
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u8 tgt_available_prots;
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u8 tgt_active_prot;
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@ -1006,6 +1020,11 @@ static int pn533_target_found(struct pn533 *dev,
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return 0;
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}
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static inline void pn533_poll_next_mod(struct pn533 *dev)
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{
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dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count;
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}
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static void pn533_poll_reset_mod_list(struct pn533 *dev)
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{
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dev->poll_mod_count = 0;
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@ -1018,107 +1037,52 @@ static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index)
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dev->poll_mod_count++;
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}
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static void pn533_poll_create_mod_list(struct pn533 *dev, u32 protocols)
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static void pn533_poll_create_mod_list(struct pn533 *dev,
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u32 im_protocols, u32 tm_protocols)
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{
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pn533_poll_reset_mod_list(dev);
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if (protocols & NFC_PROTO_MIFARE_MASK
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|| protocols & NFC_PROTO_ISO14443_MASK
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|| protocols & NFC_PROTO_NFC_DEP_MASK)
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if (im_protocols & NFC_PROTO_MIFARE_MASK
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|| im_protocols & NFC_PROTO_ISO14443_MASK
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|| im_protocols & NFC_PROTO_NFC_DEP_MASK)
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pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A);
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if (protocols & NFC_PROTO_FELICA_MASK
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|| protocols & NFC_PROTO_NFC_DEP_MASK) {
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if (im_protocols & NFC_PROTO_FELICA_MASK
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|| im_protocols & NFC_PROTO_NFC_DEP_MASK) {
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pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA);
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pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA);
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}
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if (protocols & NFC_PROTO_JEWEL_MASK)
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if (im_protocols & NFC_PROTO_JEWEL_MASK)
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pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL);
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if (protocols & NFC_PROTO_ISO14443_MASK)
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if (im_protocols & NFC_PROTO_ISO14443_MASK)
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pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B);
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}
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static void pn533_start_poll_frame(struct pn533_frame *frame,
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struct pn533_poll_modulations *mod)
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{
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pn533_tx_frame_init(frame, PN533_CMD_IN_LIST_PASSIVE_TARGET);
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memcpy(PN533_FRAME_CMD_PARAMS_PTR(frame), &mod->data, mod->len);
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frame->datalen += mod->len;
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pn533_tx_frame_finish(frame);
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if (tm_protocols)
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pn533_poll_add_mod(dev, PN533_LISTEN_MOD);
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}
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static int pn533_start_poll_complete(struct pn533 *dev, void *arg,
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u8 *params, int params_len)
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u8 *params, int params_len)
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{
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struct pn533_poll_response *resp;
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struct pn533_poll_modulations *next_mod;
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int rc;
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nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
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if (params_len == -ENOENT) {
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nfc_dev_dbg(&dev->interface->dev, "Polling operation has been"
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" stopped");
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goto stop_poll;
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}
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if (params_len < 0) {
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nfc_dev_err(&dev->interface->dev, "Error %d when running poll",
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params_len);
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goto stop_poll;
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}
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resp = (struct pn533_poll_response *) params;
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if (resp->nbtg) {
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rc = pn533_target_found(dev, resp, params_len);
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/* We must stop the poll after a valid target found */
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if (rc == 0)
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goto stop_poll;
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if (rc != -EAGAIN)
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nfc_dev_err(&dev->interface->dev, "The target found is"
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" not valid - continuing to poll");
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if (rc == 0) {
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pn533_poll_reset_mod_list(dev);
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return 0;
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}
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}
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dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count;
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next_mod = dev->poll_mod_active[dev->poll_mod_curr];
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nfc_dev_dbg(&dev->interface->dev, "Polling next modulation (0x%x)",
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dev->poll_mod_curr);
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pn533_start_poll_frame(dev->out_frame, next_mod);
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/* Don't need to down the semaphore again */
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rc = __pn533_send_cmd_frame_async(dev, dev->out_frame, dev->in_frame,
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dev->in_maxlen, pn533_start_poll_complete,
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NULL, GFP_ATOMIC);
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if (rc == -EPERM) {
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nfc_dev_dbg(&dev->interface->dev, "Cannot poll next modulation"
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" because poll has been stopped");
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goto stop_poll;
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}
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if (rc) {
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nfc_dev_err(&dev->interface->dev, "Error %d when trying to poll"
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" next modulation", rc);
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goto stop_poll;
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}
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/* Inform caller function to do not up the semaphore */
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return -EINPROGRESS;
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stop_poll:
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pn533_poll_reset_mod_list(dev);
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dev->poll_protocols = 0;
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return 0;
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return -EAGAIN;
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}
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static int pn533_init_target_frame(struct pn533_frame *frame,
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@ -1286,83 +1250,136 @@ static int pn533_init_target_complete(struct pn533 *dev, void *arg,
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return 0;
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}
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static int pn533_init_target(struct nfc_dev *nfc_dev, u32 protocols)
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static void pn533_listen_mode_timer(unsigned long data)
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{
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struct pn533 *dev = nfc_get_drvdata(nfc_dev);
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u8 *gb;
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size_t gb_len;
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struct pn533 *dev = (struct pn533 *) data;
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nfc_dev_dbg(&dev->interface->dev, "Listen mode timeout");
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/* An ack will cancel the last issued command (poll) */
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pn533_send_ack(dev, GFP_ATOMIC);
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dev->cancel_listen = 1;
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up(&dev->cmd_lock);
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pn533_poll_next_mod(dev);
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queue_work(dev->wq, &dev->poll_work);
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}
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static int pn533_poll_complete(struct pn533 *dev, void *arg,
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u8 *params, int params_len)
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{
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struct pn533_poll_modulations *cur_mod;
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int rc;
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nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
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if (params_len == -ENOENT) {
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if (dev->poll_mod_count != 0)
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return 0;
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nfc_dev_err(&dev->interface->dev,
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"Polling operation has been stopped");
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goto stop_poll;
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}
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if (params_len < 0) {
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nfc_dev_err(&dev->interface->dev,
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"Error %d when running poll", params_len);
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goto stop_poll;
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}
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cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
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if (cur_mod->len == 0) {
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del_timer(&dev->listen_timer);
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return pn533_init_target_complete(dev, arg, params, params_len);
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} else {
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rc = pn533_start_poll_complete(dev, arg, params, params_len);
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if (!rc)
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return rc;
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}
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pn533_poll_next_mod(dev);
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queue_work(dev->wq, &dev->poll_work);
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return 0;
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stop_poll:
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pn533_poll_reset_mod_list(dev);
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dev->poll_protocols = 0;
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return 0;
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}
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gb = nfc_get_local_general_bytes(nfc_dev, &gb_len);
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if (gb == NULL)
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return -ENOMEM;
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static void pn533_build_poll_frame(struct pn533 *dev,
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struct pn533_frame *frame,
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struct pn533_poll_modulations *mod)
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{
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nfc_dev_dbg(&dev->interface->dev, "mod len %d\n", mod->len);
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rc = pn533_init_target_frame(dev->out_frame, gb, gb_len);
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if (rc < 0)
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return rc;
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if (mod->len == 0) {
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/* Listen mode */
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pn533_init_target_frame(frame, dev->gb, dev->gb_len);
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} else {
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/* Polling mode */
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pn533_tx_frame_init(frame, PN533_CMD_IN_LIST_PASSIVE_TARGET);
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memcpy(PN533_FRAME_CMD_PARAMS_PTR(frame), &mod->data, mod->len);
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frame->datalen += mod->len;
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pn533_tx_frame_finish(frame);
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}
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}
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static int pn533_send_poll_frame(struct pn533 *dev)
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{
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struct pn533_poll_modulations *cur_mod;
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int rc;
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cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
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pn533_build_poll_frame(dev, dev->out_frame, cur_mod);
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rc = pn533_send_cmd_frame_async(dev, dev->out_frame, dev->in_frame,
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dev->in_maxlen,
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pn533_init_target_complete,
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NULL, GFP_KERNEL);
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dev->in_maxlen, pn533_poll_complete,
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NULL, GFP_KERNEL);
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if (rc)
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nfc_dev_err(&dev->interface->dev,
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"Error %d when trying to initiate as a target", rc);
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dev->poll_mod_count++;
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nfc_dev_err(&dev->interface->dev, "Polling loop error %d", rc);
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return rc;
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}
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static int pn533_start_im_poll(struct nfc_dev *nfc_dev, u32 protocols)
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static void pn533_wq_poll(struct work_struct *work)
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{
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struct pn533 *dev = nfc_get_drvdata(nfc_dev);
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struct pn533_poll_modulations *start_mod;
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struct pn533 *dev = container_of(work, struct pn533, poll_work);
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struct pn533_poll_modulations *cur_mod;
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int rc;
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if (dev->poll_mod_count) {
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nfc_dev_err(&dev->interface->dev, "Polling operation already"
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" active");
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return -EBUSY;
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cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
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nfc_dev_dbg(&dev->interface->dev,
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"%s cancel_listen %d modulation len %d",
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__func__, dev->cancel_listen, cur_mod->len);
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if (dev->cancel_listen == 1) {
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dev->cancel_listen = 0;
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usb_kill_urb(dev->in_urb);
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}
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pn533_poll_create_mod_list(dev, protocols);
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rc = pn533_send_poll_frame(dev);
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if (rc)
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return;
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if (!dev->poll_mod_count) {
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nfc_dev_err(&dev->interface->dev, "No valid protocols"
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" specified");
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rc = -EINVAL;
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goto error;
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}
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if (cur_mod->len == 0 && dev->poll_mod_count > 1)
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mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
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nfc_dev_dbg(&dev->interface->dev, "It will poll %d modulations types",
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dev->poll_mod_count);
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dev->poll_mod_curr = 0;
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start_mod = dev->poll_mod_active[dev->poll_mod_curr];
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pn533_start_poll_frame(dev->out_frame, start_mod);
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rc = pn533_send_cmd_frame_async(dev, dev->out_frame, dev->in_frame,
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dev->in_maxlen, pn533_start_poll_complete,
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NULL, GFP_KERNEL);
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if (rc) {
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nfc_dev_err(&dev->interface->dev, "Error %d when trying to"
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" start poll", rc);
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goto error;
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}
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dev->poll_protocols = protocols;
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return 0;
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error:
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pn533_poll_reset_mod_list(dev);
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return rc;
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return;
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}
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static int pn533_start_poll(struct nfc_dev *nfc_dev,
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@ -1380,13 +1397,18 @@ static int pn533_start_poll(struct nfc_dev *nfc_dev,
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return -EBUSY;
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}
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if (im_protocols)
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return pn533_start_im_poll(nfc_dev, im_protocols);
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if (tm_protocols) {
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dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
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if (dev->gb == NULL)
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tm_protocols = 0;
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}
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if (tm_protocols)
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return pn533_init_target(nfc_dev, tm_protocols);
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dev->poll_mod_curr = 0;
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pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
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dev->poll_protocols = im_protocols;
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dev->listen_protocols = tm_protocols;
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return -EINVAL;
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return pn533_send_poll_frame(dev);
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}
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static void pn533_stop_poll(struct nfc_dev *nfc_dev)
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@ -1395,6 +1417,8 @@ static void pn533_stop_poll(struct nfc_dev *nfc_dev)
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nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
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del_timer(&dev->listen_timer);
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if (!dev->poll_mod_count) {
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nfc_dev_dbg(&dev->interface->dev, "Polling operation was not"
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" running");
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@ -1676,6 +1700,10 @@ out:
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static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
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{
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struct pn533 *dev = nfc_get_drvdata(nfc_dev);
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pn533_poll_reset_mod_list(dev);
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pn533_deactivate_target(nfc_dev, 0);
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return 0;
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@ -2110,12 +2138,17 @@ static int pn533_probe(struct usb_interface *interface,
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INIT_WORK(&dev->cmd_work, pn533_wq_cmd_complete);
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INIT_WORK(&dev->mi_work, pn533_wq_mi_recv);
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INIT_WORK(&dev->tg_work, pn533_wq_tg_get_data);
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INIT_WORK(&dev->poll_work, pn533_wq_poll);
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dev->wq = alloc_workqueue("pn533",
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WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM,
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1);
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if (dev->wq == NULL)
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goto error;
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init_timer(&dev->listen_timer);
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dev->listen_timer.data = (unsigned long) dev;
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dev->listen_timer.function = pn533_listen_mode_timer;
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skb_queue_head_init(&dev->resp_q);
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usb_set_intfdata(interface, dev);
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@ -2212,6 +2245,8 @@ static void pn533_disconnect(struct usb_interface *interface)
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skb_queue_purge(&dev->resp_q);
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del_timer(&dev->listen_timer);
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kfree(dev->in_frame);
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usb_free_urb(dev->in_urb);
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kfree(dev->out_frame);
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