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NFC: Implement the pn533 target mode data fetching routine

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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@linux.intel.com>
This commit is contained in:
Samuel Ortiz 2012-05-31 00:07:51 +02:00
parent 73167ced31
commit 103b34cf5f
1 changed files with 80 additions and 5 deletions
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85
drivers/nfc/pn533.c
View file

@ -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);