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NFC: The core part should generate the target index 

The target index can be used by userspace to uniquely identify a target
and thus should be kept unique, per NFC adapter. Moreover, some protocols
do not provide a logical index when discovering new targets, so we have to
generate one for them.
For NCI or pn533 to fetch their logical index, we added a logical_idx field
to the target structure.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Samuel Ortiz 2012-04-10 19:43:09 +02:00 committed by John W. Linville
parent 0efbf7fb30
commit c4fbb6515a
5 changed files with 20 additions and 6 deletions
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2
include/net/nfc/nfc.h
View File

@ -79,6 +79,7 @@ struct nfc_target {
u8 sensf_res_len;
u8 sensf_res[NFC_SENSF_RES_MAXSIZE];
u8 hci_reader_gate;
u8 logical_idx;
};
struct nfc_genl_data {
@ -88,6 +89,7 @@ struct nfc_genl_data {
struct nfc_dev {
unsigned idx;
unsigned target_idx;
struct nfc_target *targets;
int n_targets;
int targets_generation;

5
net/nfc/core.c
View File

@ -428,10 +428,15 @@ EXPORT_SYMBOL(nfc_alloc_recv_skb);
int nfc_targets_found(struct nfc_dev *dev,
struct nfc_target *targets, int n_targets)
{
int i;
pr_debug("dev_name=%s n_targets=%d\n", dev_name(&dev->dev), n_targets);
dev->polling = false;
for (i = 0; i < n_targets; i++)
targets[i].idx = dev->target_idx++;
spin_lock_bh(&dev->targets_lock);
dev->targets_generation++;

2
net/nfc/nci/core.c
View File

@ -477,7 +477,7 @@ static int nci_activate_target(struct nfc_dev *nfc_dev, __u32 target_idx,
}
if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
param.rf_discovery_id = target->idx;
param.rf_discovery_id = target->logical_idx;
if (protocol == NFC_PROTO_JEWEL)
param.rf_protocol = NCI_RF_PROTOCOL_T1T;

11
net/nfc/nci/ntf.c
View File

@ -227,7 +227,7 @@ static void nci_add_new_target(struct nci_dev *ndev,
for (i = 0; i < ndev->n_targets; i++) {
target = &ndev->targets[i];
if (target->idx == ntf->rf_discovery_id) {
if (target->logical_idx == ntf->rf_discovery_id) {
/* This target already exists, add the new protocol */
nci_add_new_protocol(ndev, target, ntf->rf_protocol,
ntf->rf_tech_and_mode,
@ -248,10 +248,10 @@ static void nci_add_new_target(struct nci_dev *ndev,
ntf->rf_tech_and_mode,
&ntf->rf_tech_specific_params);
if (!rc) {
target->idx = ntf->rf_discovery_id;
target->logical_idx = ntf->rf_discovery_id;
ndev->n_targets++;
pr_debug("target_idx %d, n_targets %d\n", target->idx,
pr_debug("logical idx %d, n_targets %d\n", target->logical_idx,
ndev->n_targets);
}
}
@ -372,10 +372,11 @@ static void nci_target_auto_activated(struct nci_dev *ndev,
if (rc)
return;
target->idx = ntf->rf_discovery_id;
target->logical_idx = ntf->rf_discovery_id;
ndev->n_targets++;
pr_debug("target_idx %d, n_targets %d\n", target->idx, ndev->n_targets);
pr_debug("logical idx %d, n_targets %d\n",
target->logical_idx, ndev->n_targets);
nfc_targets_found(ndev->nfc_dev, ndev->targets, ndev->n_targets);
}

6
net/nfc/rawsock.c
View File

@ -92,6 +92,12 @@ static int rawsock_connect(struct socket *sock, struct sockaddr *_addr,
goto error;
}
if (addr->target_idx > dev->target_idx - 1 ||
addr->target_idx < dev->target_idx - dev->n_targets) {
rc = -EINVAL;
goto error;
}
rc = nfc_activate_target(dev, addr->target_idx, addr->nfc_protocol);
if (rc)
goto put_dev;