This one needs to be called as soon as we are activated as a target, for
the pn533 to receive the first SYMM and keep the LLCP link alive.
Signed-off-by: Samuel Ortiz <sameo@xxxxxxxxxxxxxxx>
---
drivers/nfc/pn533.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++++---
1 files changed, 80 insertions(+), 5 deletions(-)
diff --git a/drivers/nfc/pn533.c b/drivers/nfc/pn533.c
index fd94c6f..6a506e2 100644
--- a/drivers/nfc/pn533.c
+++ b/drivers/nfc/pn533.c
@@ -75,6 +75,7 @@ MODULE_DEVICE_TABLE(usb, pn533_table);
#define PN533_CMD_IN_JUMP_FOR_DEP 0x56
#define PN533_CMD_TG_INIT_AS_TARGET 0x8c
+#define PN533_CMD_TG_GET_DATA 0x86
#define PN533_CMD_RESPONSE(cmd) (cmd + 1)
@@ -83,6 +84,9 @@ MODULE_DEVICE_TABLE(usb, pn533_table);
#define PN533_CMD_MI_MASK 0x40
#define PN533_CMD_RET_SUCCESS 0x00
+/* PN533 status codes */
+#define PN533_STATUS_TARGET_RELEASED 0x29
+
struct pn533;
typedef int (*pn533_cmd_complete_t) (struct pn533 *dev, void *arg,
@@ -296,6 +300,7 @@ struct pn533 {
struct workqueue_struct *wq;
struct work_struct cmd_work;
struct work_struct mi_work;
+ struct work_struct tg_work;
struct pn533_frame *wq_in_frame;
int wq_in_error;
@@ -1132,6 +1137,68 @@ static int pn533_init_target_frame(struct pn533_frame *frame,
return 0;
}
+#define PN533_CMD_DATAEXCH_HEAD_LEN (sizeof(struct pn533_frame) + 3)
+#define PN533_CMD_DATAEXCH_DATA_MAXLEN 262
+static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg,
+ u8 *params, int params_len)
+{
+ struct sk_buff *skb_resp = arg;
+ struct pn533_frame *in_frame = (struct pn533_frame *) skb_resp->data;
+
+ nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
+
+ if (params_len < 0) {
+ nfc_dev_err(&dev->interface->dev,
+ "Error %d when starting as a target",
+ params_len);
+
+ return params_len;
+ }
+
+ if (params_len > 0 && params[0] != 0) {
+ nfc_tm_deactivated(dev->nfc_dev);
+
+ kfree_skb(skb_resp);
+ return 0;
+ }
+
+ skb_put(skb_resp, PN533_FRAME_SIZE(in_frame));
+ skb_pull(skb_resp, PN533_CMD_DATAEXCH_HEAD_LEN);
+ skb_trim(skb_resp, skb_resp->len - PN533_FRAME_TAIL_SIZE);
+
+ return nfc_tm_data_received(dev->nfc_dev, skb_resp);
+}
+
+static void pn533_wq_tg_get_data(struct work_struct *work)
+{
+ struct pn533 *dev = container_of(work, struct pn533, tg_work);
+ struct pn533_frame *in_frame;
+ struct sk_buff *skb_resp;
+ size_t skb_resp_len;
+
+ nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
+
+ skb_resp_len = PN533_CMD_DATAEXCH_HEAD_LEN +
+ PN533_CMD_DATAEXCH_DATA_MAXLEN +
+ PN533_FRAME_TAIL_SIZE;
+
+ skb_resp = nfc_alloc_recv_skb(skb_resp_len, GFP_KERNEL);
+ if (!skb_resp)
+ return;
+
+ in_frame = (struct pn533_frame *)skb_resp->data;
+
+ pn533_tx_frame_init(dev->out_frame, PN533_CMD_TG_GET_DATA);
+ pn533_tx_frame_finish(dev->out_frame);
+
+ pn533_send_cmd_frame_async(dev, dev->out_frame, in_frame,
+ skb_resp_len,
+ pn533_tm_get_data_complete,
+ skb_resp, GFP_KERNEL);
+
+ return;
+}
+
#define ATR_REQ_GB_OFFSET 17
static int pn533_init_target_complete(struct pn533 *dev, void *arg,
u8 *params, int params_len)
@@ -1139,6 +1206,7 @@ static int pn533_init_target_complete(struct pn533 *dev, void *arg,
struct pn533_cmd_init_target_response *resp;
u8 frame, comm_mode = NFC_COMM_PASSIVE, *gb;
size_t gb_len;
+ int rc;
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
@@ -1169,8 +1237,17 @@ static int pn533_init_target_complete(struct pn533 *dev, void *arg,
gb = resp->cmd + ATR_REQ_GB_OFFSET;
gb_len = params_len - (ATR_REQ_GB_OFFSET + 1);
- return nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
- comm_mode, gb, gb_len);
+ rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
+ comm_mode, gb, gb_len);
+ if (rc < 0) {
+ nfc_dev_err(&dev->interface->dev,
+ "Error when signaling target activation");
+ return rc;
+ }
+
+ queue_work(dev->wq, &dev->tg_work);
+
+ return 0;
}
static int pn533_init_target(struct nfc_dev *nfc_dev, u32 protocols)
@@ -1553,9 +1630,6 @@ static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
return 0;
}
-#define PN533_CMD_DATAEXCH_HEAD_LEN (sizeof(struct pn533_frame) + 3)
-#define PN533_CMD_DATAEXCH_DATA_MAXLEN 262
-
static int pn533_data_exchange_tx_frame(struct pn533 *dev, struct sk_buff *skb)
{
int payload_len = skb->len;
@@ -1920,6 +1994,7 @@ static int pn533_probe(struct usb_interface *interface,
INIT_WORK(&dev->cmd_work, pn533_wq_cmd_complete);
INIT_WORK(&dev->mi_work, pn533_wq_mi_recv);
+ INIT_WORK(&dev->tg_work, pn533_wq_tg_get_data);
dev->wq = alloc_workqueue("pn533",
WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM,
1);
--
1.7.9.1
--
To unsubscribe from this list: send the line "unsubscribe linux-wireless" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
