[PATCH v9 6/7] nfc: pn533: Add autopoll capability

Lars Poeschel
2019-10-08T14:06:40Z

pn532 devices support an autopoll command, that lets the chip
automatically poll for selected nfc technologies instead of manually
looping through every single nfc technology the user is interested in.
This is faster and less cpu and bus intensive than manually polling.
This adds this autopoll capability to the pn533 driver.

Cc: Johan Hovold <johan@kernel.org>
Cc: David Miller <davem@davemloft.net>
Signed-off-by: Lars Poeschel <poeschel@lemonage.de>
---
Changes in v9:
- Rebased the patch series on v5.4-rc2

Changes in v8:
- Reverse christmas tree order for local variables in
pn533_autopoll_complete and pn533_start_poll

Changes in v7:
- Remove __packed attribute at struct pn532_autopoll_resp
- Add missing '\n' at the end of dev_dbg and nfc_err strings

Changes in v6:
- Rebased the patch series on v5.3-rc5

drivers/nfc/pn533/pn533.c | 193 +++++++++++++++++++++++++++++++++++++-
drivers/nfc/pn533/pn533.h | 10 +-
2 files changed, 197 insertions(+), 6 deletions(-)

diff --git a/drivers/nfc/pn533/pn533.c b/drivers/nfc/pn533/pn533.c
index e5d5e4c83a04..044b52d036e3 100644
--- a/drivers/nfc/pn533/pn533.c
+++ b/drivers/nfc/pn533/pn533.c
@@ -185,6 +185,32 @@ struct pn533_cmd_jump_dep_response {
u8 gt[];
} __packed;

+struct pn532_autopoll_resp {
+ u8 type;
+ u8 ln;
+ u8 tg;
+ u8 tgdata[];
+};
+
+/* PN532_CMD_IN_AUTOPOLL */
+#define PN532_AUTOPOLL_POLLNR_INFINITE 0xff
+#define PN532_AUTOPOLL_PERIOD 0x03 /* in units of 150 ms */
+
+#define PN532_AUTOPOLL_TYPE_GENERIC_106 0x00
+#define PN532_AUTOPOLL_TYPE_GENERIC_212 0x01
+#define PN532_AUTOPOLL_TYPE_GENERIC_424 0x02
+#define PN532_AUTOPOLL_TYPE_JEWEL 0x04
+#define PN532_AUTOPOLL_TYPE_MIFARE 0x10
+#define PN532_AUTOPOLL_TYPE_FELICA212 0x11
+#define PN532_AUTOPOLL_TYPE_FELICA424 0x12
+#define PN532_AUTOPOLL_TYPE_ISOA 0x20
+#define PN532_AUTOPOLL_TYPE_ISOB 0x23
+#define PN532_AUTOPOLL_TYPE_DEP_PASSIVE_106 0x40
+#define PN532_AUTOPOLL_TYPE_DEP_PASSIVE_212 0x41
+#define PN532_AUTOPOLL_TYPE_DEP_PASSIVE_424 0x42
+#define PN532_AUTOPOLL_TYPE_DEP_ACTIVE_106 0x80
+#define PN532_AUTOPOLL_TYPE_DEP_ACTIVE_212 0x81
+#define PN532_AUTOPOLL_TYPE_DEP_ACTIVE_424 0x82

/* PN533_TG_INIT_AS_TARGET */
#define PN533_INIT_TARGET_PASSIVE 0x1
@@ -1389,6 +1415,101 @@ static int pn533_poll_dep(struct nfc_dev *nfc_dev)
return rc;
}

+static int pn533_autopoll_complete(struct pn533 *dev, void *arg,
+ struct sk_buff *resp)
+{
+ struct pn532_autopoll_resp *apr;
+ struct nfc_target nfc_tgt;
+ u8 nbtg;
+ int rc;
+
+ if (IS_ERR(resp)) {
+ rc = PTR_ERR(resp);
+
+ nfc_err(dev->dev, "%s autopoll complete error %d\n",
+ __func__, rc);
+
+ if (rc == -ENOENT) {
+ if (dev->poll_mod_count != 0)
+ return rc;
+ goto stop_poll;
+ } else if (rc < 0) {
+ nfc_err(dev->dev,
+ "Error %d when running autopoll\n", rc);
+ goto stop_poll;
+ }
+ }
+
+ nbtg = resp->data[0];
+ if ((nbtg > 2) || (nbtg <= 0))
+ return -EAGAIN;
+
+ apr = (struct pn532_autopoll_resp *)&resp->data[1];
+ while (nbtg--) {
+ memset(&nfc_tgt, 0, sizeof(struct nfc_target));
+ switch (apr->type) {
+ case PN532_AUTOPOLL_TYPE_ISOA:
+ dev_dbg(dev->dev, "ISOA\n");
+ rc = pn533_target_found_type_a(&nfc_tgt, apr->tgdata,
+ apr->ln - 1);
+ break;
+ case PN532_AUTOPOLL_TYPE_FELICA212:
+ case PN532_AUTOPOLL_TYPE_FELICA424:
+ dev_dbg(dev->dev, "FELICA\n");
+ rc = pn533_target_found_felica(&nfc_tgt, apr->tgdata,
+ apr->ln - 1);
+ break;
+ case PN532_AUTOPOLL_TYPE_JEWEL:
+ dev_dbg(dev->dev, "JEWEL\n");
+ rc = pn533_target_found_jewel(&nfc_tgt, apr->tgdata,
+ apr->ln - 1);
+ break;
+ case PN532_AUTOPOLL_TYPE_ISOB:
+ dev_dbg(dev->dev, "ISOB\n");
+ rc = pn533_target_found_type_b(&nfc_tgt, apr->tgdata,
+ apr->ln - 1);
+ break;
+ case PN532_AUTOPOLL_TYPE_MIFARE:
+ dev_dbg(dev->dev, "Mifare\n");
+ rc = pn533_target_found_type_a(&nfc_tgt, apr->tgdata,
+ apr->ln - 1);
+ break;
+ default:
+ nfc_err(dev->dev,
+ "Unknown current poll modulation\n");
+ rc = -EPROTO;
+ }
+
+ if (rc)
+ goto done;
+
+ if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
+ nfc_err(dev->dev,
+ "The Tg found doesn't have the desired protocol\n");
+ rc = -EAGAIN;
+ goto done;
+ }
+
+ dev->tgt_available_prots = nfc_tgt.supported_protocols;
+ apr = (struct pn532_autopoll_resp *)
+ (apr->tgdata + (apr->ln - 1));
+ }
+
+ pn533_poll_reset_mod_list(dev);
+ nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
+
+done:
+ dev_kfree_skb(resp);
+ return rc;
+
+stop_poll:
+ nfc_err(dev->dev, "autopoll operation has been stopped\n");
+
+ pn533_poll_reset_mod_list(dev);
+ dev->poll_protocols = 0;
+ return rc;
+}
+
static int pn533_poll_complete(struct pn533 *dev, void *arg,
struct sk_buff *resp)
{
@@ -1532,6 +1653,7 @@ static int pn533_start_poll(struct nfc_dev *nfc_dev,
{
struct pn533 *dev = nfc_get_drvdata(nfc_dev);
struct pn533_poll_modulations *cur_mod;
+ struct sk_buff *skb;
u8 rand_mod;
int rc;

@@ -1557,9 +1679,73 @@ static int pn533_start_poll(struct nfc_dev *nfc_dev,
tm_protocols = 0;
}

- pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
dev->poll_protocols = im_protocols;
dev->listen_protocols = tm_protocols;
+ if (dev->device_type == PN533_DEVICE_PN532_AUTOPOLL) {
+ skb = pn533_alloc_skb(dev, 4 + 6);
+ if (!skb)
+ return -ENOMEM;
+
+ *((u8 *)skb_put(skb, sizeof(u8))) =
+ PN532_AUTOPOLL_POLLNR_INFINITE;
+ *((u8 *)skb_put(skb, sizeof(u8))) = PN532_AUTOPOLL_PERIOD;
+
+ if ((im_protocols & NFC_PROTO_MIFARE_MASK) &&
+ (im_protocols & NFC_PROTO_ISO14443_MASK) &&
+ (im_protocols & NFC_PROTO_NFC_DEP_MASK))
+ *((u8 *)skb_put(skb, sizeof(u8))) =
+ PN532_AUTOPOLL_TYPE_GENERIC_106;
+ else {
+ if (im_protocols & NFC_PROTO_MIFARE_MASK)
+ *((u8 *)skb_put(skb, sizeof(u8))) =
+ PN532_AUTOPOLL_TYPE_MIFARE;
+
+ if (im_protocols & NFC_PROTO_ISO14443_MASK)
+ *((u8 *)skb_put(skb, sizeof(u8))) =
+ PN532_AUTOPOLL_TYPE_ISOA;
+
+ if (im_protocols & NFC_PROTO_NFC_DEP_MASK) {
+ *((u8 *)skb_put(skb, sizeof(u8))) =
+ PN532_AUTOPOLL_TYPE_DEP_PASSIVE_106;
+ *((u8 *)skb_put(skb, sizeof(u8))) =
+ PN532_AUTOPOLL_TYPE_DEP_PASSIVE_212;
+ *((u8 *)skb_put(skb, sizeof(u8))) =
+ PN532_AUTOPOLL_TYPE_DEP_PASSIVE_424;
+ }
+ }
+
+ if (im_protocols & NFC_PROTO_FELICA_MASK ||
+ im_protocols & NFC_PROTO_NFC_DEP_MASK) {
+ *((u8 *)skb_put(skb, sizeof(u8))) =
+ PN532_AUTOPOLL_TYPE_FELICA212;
+ *((u8 *)skb_put(skb, sizeof(u8))) =
+ PN532_AUTOPOLL_TYPE_FELICA424;
+ }
+
+ if (im_protocols & NFC_PROTO_JEWEL_MASK)
+ *((u8 *)skb_put(skb, sizeof(u8))) =
+ PN532_AUTOPOLL_TYPE_JEWEL;
+
+ if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
+ *((u8 *)skb_put(skb, sizeof(u8))) =
+ PN532_AUTOPOLL_TYPE_ISOB;
+
+ if (tm_protocols)
+ *((u8 *)skb_put(skb, sizeof(u8))) =
+ PN532_AUTOPOLL_TYPE_DEP_ACTIVE_106;
+
+ rc = pn533_send_cmd_async(dev, PN533_CMD_IN_AUTOPOLL, skb,
+ pn533_autopoll_complete, NULL);
+
+ if (rc < 0)
+ dev_kfree_skb(skb);
+ else
+ dev->poll_mod_count++;
+
+ return rc;
+ }
+
+ pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);

/* Do not always start polling from the same modulation */
get_random_bytes(&rand_mod, sizeof(rand_mod));
@@ -2461,7 +2647,8 @@ static int pn533_dev_up(struct nfc_dev *nfc_dev)
if (dev->phy_ops->dev_up)
dev->phy_ops->dev_up(dev);

- if (dev->device_type == PN533_DEVICE_PN532) {
+ if ((dev->device_type == PN533_DEVICE_PN532) ||
+ (dev->device_type == PN533_DEVICE_PN532_AUTOPOLL)) {
int rc = pn532_sam_configuration(nfc_dev);

if (rc)
@@ -2508,6 +2695,7 @@ static int pn533_setup(struct pn533 *dev)
case PN533_DEVICE_PASORI:
case PN533_DEVICE_ACR122U:
case PN533_DEVICE_PN532:
+ case PN533_DEVICE_PN532_AUTOPOLL:
max_retries.mx_rty_atr = 0x2;
max_retries.mx_rty_psl = 0x1;
max_retries.mx_rty_passive_act =
@@ -2544,6 +2732,7 @@ static int pn533_setup(struct pn533 *dev)
switch (dev->device_type) {
case PN533_DEVICE_STD:
case PN533_DEVICE_PN532:
+ case PN533_DEVICE_PN532_AUTOPOLL:
break;

case PN533_DEVICE_PASORI:
diff --git a/drivers/nfc/pn533/pn533.h b/drivers/nfc/pn533/pn533.h
index 6541088fad73..388fc1b4fcc1 100644
--- a/drivers/nfc/pn533/pn533.h
+++ b/drivers/nfc/pn533/pn533.h
@@ -6,10 +6,11 @@
* Copyright (C) 2012-2013 Tieto Poland
*/

-#define PN533_DEVICE_STD 0x1
-#define PN533_DEVICE_PASORI 0x2
-#define PN533_DEVICE_ACR122U 0x3
-#define PN533_DEVICE_PN532 0x4
+#define PN533_DEVICE_STD 0x1
+#define PN533_DEVICE_PASORI 0x2
+#define PN533_DEVICE_ACR122U 0x3
+#define PN533_DEVICE_PN532 0x4
+#define PN533_DEVICE_PN532_AUTOPOLL 0x5

#define PN533_ALL_PROTOCOLS (NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK |\
NFC_PROTO_FELICA_MASK | NFC_PROTO_ISO14443_MASK |\
@@ -75,6 +76,7 @@
#define PN533_CMD_IN_ATR 0x50
#define PN533_CMD_IN_RELEASE 0x52
#define PN533_CMD_IN_JUMP_FOR_DEP 0x56
+#define PN533_CMD_IN_AUTOPOLL 0x60

#define PN533_CMD_TG_INIT_AS_TARGET 0x8c
#define PN533_CMD_TG_GET_DATA 0x86
--
2.23.0