Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 1ed28f61 authored by Samuel Ortiz's avatar Samuel Ortiz Committed by John W. Linville
Browse files

NFC: Add a DEP link control netlink command



NFC-DEP (Data Exchange Protocol) is an NFC MAC layer.
This command allows to enable and disable the DEP link on to which e.g.
LLCP can run.

Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent db81a624
Loading
Loading
Loading
Loading
+14 −0
Original line number Diff line number Diff line
@@ -62,6 +62,8 @@ enum nfc_commands {
	NFC_CMD_GET_DEVICE,
	NFC_CMD_DEV_UP,
	NFC_CMD_DEV_DOWN,
	NFC_CMD_DEP_LINK_UP,
	NFC_CMD_DEP_LINK_DOWN,
	NFC_CMD_START_POLL,
	NFC_CMD_STOP_POLL,
	NFC_CMD_GET_TARGET,
@@ -86,6 +88,8 @@ enum nfc_commands {
 * @NFC_ATTR_TARGET_SENS_RES: NFC-A targets extra information such as NFCID
 * @NFC_ATTR_TARGET_SEL_RES: NFC-A targets extra information (useful if the
 *	target is not NFC-Forum compliant)
 * @NFC_ATTR_COMM_MODE: Passive or active mode
 * @NFC_ATTR_RF_MODE: Initiator or target
 */
enum nfc_attrs {
	NFC_ATTR_UNSPEC,
@@ -95,6 +99,8 @@ enum nfc_attrs {
	NFC_ATTR_TARGET_INDEX,
	NFC_ATTR_TARGET_SENS_RES,
	NFC_ATTR_TARGET_SEL_RES,
	NFC_ATTR_COMM_MODE,
	NFC_ATTR_RF_MODE,
/* private: internal use only */
	__NFC_ATTR_AFTER_LAST
};
@@ -111,6 +117,14 @@ enum nfc_attrs {

#define NFC_PROTO_MAX		6

/* NFC communication modes */
#define NFC_COMM_ACTIVE  0
#define NFC_COMM_PASSIVE 1

/* NFC RF modes */
#define NFC_RF_INITIATOR 0
#define NFC_RF_TARGET    1

/* NFC protocols masks used in bitsets */
#define NFC_PROTO_JEWEL_MASK	(1 << NFC_PROTO_JEWEL)
#define NFC_PROTO_MIFARE_MASK	(1 << NFC_PROTO_MIFARE)
+11 −0
Original line number Diff line number Diff line
@@ -52,6 +52,9 @@ struct nfc_ops {
	int (*dev_down)(struct nfc_dev *dev);
	int (*start_poll)(struct nfc_dev *dev, u32 protocols);
	void (*stop_poll)(struct nfc_dev *dev);
	int (*dep_link_up)(struct nfc_dev *dev, int target_idx,
				u8 comm_mode, u8 rf_mode);
	int (*dep_link_down)(struct nfc_dev *dev);
	int (*activate_target)(struct nfc_dev *dev, u32 target_idx,
							u32 protocol);
	void (*deactivate_target)(struct nfc_dev *dev, u32 target_idx);
@@ -60,6 +63,9 @@ struct nfc_ops {
							void *cb_context);
};

#define NFC_TARGET_IDX_ANY -1
#define NFC_MAX_GT_LEN 48

struct nfc_target {
	u32 idx;
	u32 supported_protocols;
@@ -83,6 +89,8 @@ struct nfc_dev {
	bool dev_up;
	bool polling;
	bool remote_activated;
	bool dep_link_up;
	u32 dep_rf_mode;
	struct nfc_genl_data genl_data;
	u32 supported_protocols;

@@ -165,4 +173,7 @@ struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp);
int nfc_targets_found(struct nfc_dev *dev, struct nfc_target *targets,
							int ntargets);

int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx,
		       u8 comm_mode, u8 rf_mode);

#endif /* __NET_NFC_H */
+77 −0
Original line number Diff line number Diff line
@@ -181,6 +181,83 @@ int nfc_stop_poll(struct nfc_dev *dev)
	return rc;
}

int nfc_dep_link_up(struct nfc_dev *dev, int target_index,
					u8 comm_mode, u8 rf_mode)
{
	int rc = 0;

	pr_debug("dev_name=%s comm:%d rf:%d\n",
			dev_name(&dev->dev), comm_mode, rf_mode);

	if (!dev->ops->dep_link_up)
		return -EOPNOTSUPP;

	device_lock(&dev->dev);

	if (!device_is_registered(&dev->dev)) {
		rc = -ENODEV;
		goto error;
	}

	if (dev->dep_link_up == true) {
		rc = -EALREADY;
		goto error;
	}

	rc = dev->ops->dep_link_up(dev, target_index, comm_mode, rf_mode);

error:
	device_unlock(&dev->dev);
	return rc;
}

int nfc_dep_link_down(struct nfc_dev *dev)
{
	int rc = 0;

	pr_debug("dev_name=%s\n", dev_name(&dev->dev));

	if (!dev->ops->dep_link_down)
		return -EOPNOTSUPP;

	device_lock(&dev->dev);

	if (!device_is_registered(&dev->dev)) {
		rc = -ENODEV;
		goto error;
	}

	if (dev->dep_link_up == false) {
		rc = -EALREADY;
		goto error;
	}

	if (dev->dep_rf_mode == NFC_RF_TARGET) {
		rc = -EOPNOTSUPP;
		goto error;
	}

	rc = dev->ops->dep_link_down(dev);
	if (!rc) {
		dev->dep_link_up = false;
		nfc_genl_dep_link_down_event(dev);
	}

error:
	device_unlock(&dev->dev);
	return rc;
}

int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx,
					u8 comm_mode, u8 rf_mode)
{
	dev->dep_link_up = true;
	dev->dep_rf_mode = rf_mode;

	return nfc_genl_dep_link_up_event(dev, target_idx, comm_mode, rf_mode);
}
EXPORT_SYMBOL(nfc_dep_link_is_up);

/**
 * nfc_activate_target - prepare the target for data exchange
 *
+144 −0
Original line number Diff line number Diff line
@@ -46,6 +46,8 @@ static const struct nla_policy nfc_genl_policy[NFC_ATTR_MAX + 1] = {
	[NFC_ATTR_DEVICE_NAME] = { .type = NLA_STRING,
				.len = NFC_DEVICE_NAME_MAXSIZE },
	[NFC_ATTR_PROTOCOLS] = { .type = NLA_U32 },
	[NFC_ATTR_COMM_MODE] = { .type = NLA_U8 },
	[NFC_ATTR_RF_MODE] = { .type = NLA_U8 },
};

static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target,
@@ -311,6 +313,75 @@ static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
	return 0;
}

int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
						u8 comm_mode, u8 rf_mode)
{
	struct sk_buff *msg;
	void *hdr;

	pr_debug("DEP link is up\n");

	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
	if (!msg)
		return -ENOMEM;

	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
				NFC_CMD_DEP_LINK_UP);
	if (!hdr)
		goto free_msg;

	NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
	if (rf_mode == NFC_RF_INITIATOR)
		NLA_PUT_U32(msg, NFC_ATTR_TARGET_INDEX, target_idx);
	NLA_PUT_U8(msg, NFC_ATTR_COMM_MODE, comm_mode);
	NLA_PUT_U8(msg, NFC_ATTR_RF_MODE, rf_mode);

	genlmsg_end(msg, hdr);

	dev->dep_link_up = true;

	genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);

	return 0;

nla_put_failure:
	genlmsg_cancel(msg, hdr);
free_msg:
	nlmsg_free(msg);
	return -EMSGSIZE;
}

int nfc_genl_dep_link_down_event(struct nfc_dev *dev)
{
	struct sk_buff *msg;
	void *hdr;

	pr_debug("DEP link is down\n");

	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
	if (!msg)
		return -ENOMEM;

	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
				NFC_CMD_DEP_LINK_DOWN);
	if (!hdr)
		goto free_msg;

	NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);

	genlmsg_end(msg, hdr);

	genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);

	return 0;

nla_put_failure:
	genlmsg_cancel(msg, hdr);
free_msg:
	nlmsg_free(msg);
	return -EMSGSIZE;
}

static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
{
	struct sk_buff *msg;
@@ -398,6 +469,8 @@ static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
	u32 idx;
	u32 protocols;

	pr_debug("Poll start\n");

	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
		!info->attrs[NFC_ATTR_PROTOCOLS])
		return -EINVAL;
@@ -452,6 +525,67 @@ static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
	return rc;
}

static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
{
	struct nfc_dev *dev;
	int rc, tgt_idx;
	u32 idx;
	u8 comm, rf;

	pr_debug("DEP link up\n");

	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
			!info->attrs[NFC_ATTR_COMM_MODE] ||
			!info->attrs[NFC_ATTR_RF_MODE])
		return -EINVAL;

	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
	if (!info->attrs[NFC_ATTR_TARGET_INDEX])
		tgt_idx = NFC_TARGET_IDX_ANY;
	else
		tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);

	comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
	rf = nla_get_u8(info->attrs[NFC_ATTR_RF_MODE]);

	if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
		return -EINVAL;

	if (rf != NFC_RF_INITIATOR && comm != NFC_RF_TARGET)
		return -EINVAL;

	dev = nfc_get_device(idx);
	if (!dev)
		return -ENODEV;

	rc = nfc_dep_link_up(dev, tgt_idx, comm, rf);

	nfc_put_device(dev);

	return rc;
}

static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
{
	struct nfc_dev *dev;
	int rc;
	u32 idx;

	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
		return -EINVAL;

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

	dev = nfc_get_device(idx);
	if (!dev)
		return -ENODEV;

	rc = nfc_dep_link_down(dev);

	nfc_put_device(dev);
	return rc;
}

static struct genl_ops nfc_genl_ops[] = {
	{
		.cmd = NFC_CMD_GET_DEVICE,
@@ -480,6 +614,16 @@ static struct genl_ops nfc_genl_ops[] = {
		.doit = nfc_genl_stop_poll,
		.policy = nfc_genl_policy,
	},
	{
		.cmd = NFC_CMD_DEP_LINK_UP,
		.doit = nfc_genl_dep_link_up,
		.policy = nfc_genl_policy,
	},
	{
		.cmd = NFC_CMD_DEP_LINK_DOWN,
		.doit = nfc_genl_dep_link_down,
		.policy = nfc_genl_policy,
	},
	{
		.cmd = NFC_CMD_GET_TARGET,
		.dumpit = nfc_genl_dump_targets,
+9 −0
Original line number Diff line number Diff line
@@ -68,6 +68,10 @@ int nfc_genl_targets_found(struct nfc_dev *dev);
int nfc_genl_device_added(struct nfc_dev *dev);
int nfc_genl_device_removed(struct nfc_dev *dev);

int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
			       u8 comm_mode, u8 rf_mode);
int nfc_genl_dep_link_down_event(struct nfc_dev *dev);

struct nfc_dev *nfc_get_device(unsigned idx);

static inline void nfc_put_device(struct nfc_dev *dev)
@@ -102,6 +106,11 @@ int nfc_start_poll(struct nfc_dev *dev, u32 protocols);

int nfc_stop_poll(struct nfc_dev *dev);

int nfc_dep_link_up(struct nfc_dev *dev, int target_idx,
				u8 comm_mode, u8 rf_mode);

int nfc_dep_link_down(struct nfc_dev *dev);

int nfc_activate_target(struct nfc_dev *dev, u32 target_idx, u32 protocol);

int nfc_deactivate_target(struct nfc_dev *dev, u32 target_idx);