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Commit 3682f49f authored by Christophe Ricard's avatar Christophe Ricard Committed by Samuel Ortiz
Browse files

NFC: netlink: Add new netlink command NFC_CMD_ACTIVATE_TARGET 



Some tag might get deactivated after some read or write tentative.
This may happen for example with Mifare Ultralight C tag when trying
to read the last 4 blocks (starting block 0x2c) configured as write
only.
NFC_CMD_ACTIVATE_TARGET will try to reselect the tag in order to
detect if it got remove from the field or if it is still present.

Signed-off-by: default avatarChristophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 9295b5b5

include/uapi/linux/nfc.h

+1 −0
Original line number Diff line number Diff line
@@ -116,6 +116,7 @@ enum nfc_commands { 
	NFC_EVENT_SE_TRANSACTION,

	NFC_CMD_GET_SE,

	NFC_CMD_SE_IO,

	NFC_CMD_ACTIVATE_TARGET,

/* private: internal use only */

	__NFC_CMD_AFTER_LAST

};

net/nfc/netlink.c

+30 −0
Original line number Diff line number Diff line
@@ -810,6 +810,31 @@ static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info) 
	return rc;

}



static int nfc_genl_activate_target(struct sk_buff *skb, struct genl_info *info)

{

	struct nfc_dev *dev;

	u32 device_idx, target_idx, protocol;

	int rc;



	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])

		return -EINVAL;



	device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);



	dev = nfc_get_device(device_idx);

	if (!dev)

		return -ENODEV;



	target_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);

	protocol = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);



	nfc_deactivate_target(dev, target_idx);

	rc = nfc_activate_target(dev, target_idx, protocol);



	nfc_put_device(dev);

	return 0;

}



static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)

{

	struct nfc_dev *dev;
@@ -1455,6 +1480,11 @@ static const struct genl_ops nfc_genl_ops[] = { 
		.doit = nfc_genl_se_io,

		.policy = nfc_genl_policy,

	},

	{

		.cmd = NFC_CMD_ACTIVATE_TARGET,

		.doit = nfc_genl_activate_target,

		.policy = nfc_genl_policy,

	},

};