NFC: Add passive initiator data for pn533

When trying to enable a DEP link as a passive initiator, pn533 needs to
provide the polling request command payload.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 18 insertions, 5 deletions

diff --git a/drivers/nfc/pn533.c b/drivers/nfc/pn533.c
index d9763440b8e..806ab3da641 100644
--- a/drivers/nfc/pn533.c
+++ b/drivers/nfc/pn533.c
@@ -256,7 +256,7 @@ struct pn533_cmd_jump_dep {
         u8 active;
         u8 baud;
         u8 next;
-        u8 gt[];
+        u8 data[];
 } __packed;
 
 struct pn533_cmd_jump_dep_response {
@@ -1582,12 +1582,14 @@ static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
         return 0;
 }
 
+#define PASSIVE_DATA_LEN 5
 static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
                              u8 comm_mode, u8* gb, size_t gb_len)
 {
         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
         struct pn533_cmd_jump_dep *cmd;
-        u8 cmd_len;
+        u8 cmd_len, *data_ptr;
+        u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
         int rc;
 
         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
@@ -1605,6 +1607,9 @@ static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
         }
 
         cmd_len = sizeof(struct pn533_cmd_jump_dep) + gb_len;
+        if (comm_mode == NFC_COMM_PASSIVE)
+                cmd_len += PASSIVE_DATA_LEN;
+
         cmd = kzalloc(cmd_len, GFP_KERNEL);
         if (cmd == NULL)
                 return -ENOMEM;
@@ -1612,10 +1617,18 @@ static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
         pn533_tx_frame_init(dev->out_frame, PN533_CMD_IN_JUMP_FOR_DEP);
 
         cmd->active = !comm_mode;
-        cmd->baud = 0;
+        cmd->next = 0;
+        cmd->baud = 2;
+        data_ptr = cmd->data;
+        if (comm_mode == NFC_COMM_PASSIVE && cmd->baud > 0) {
+                memcpy(data_ptr, passive_data, PASSIVE_DATA_LEN);
+                cmd->next |= 1;
+                data_ptr += PASSIVE_DATA_LEN;
+        }
+
         if (gb != NULL && gb_len > 0) {
-                cmd->next = 4; /* We have some Gi */
-                memcpy(cmd->gt, gb, gb_len);
+                cmd->next |= 4; /* We have some Gi */
+                memcpy(data_ptr, gb, gb_len);
         } else {
                 cmd->next = 0;
         }