summaryrefslogtreecommitdiffstats
path: root/net/nfc/core.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
commit5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch)
treea94efe259b9009378be6d90eb30d2b019d95c194 /net/nfc/core.c
parentInitial commit. (diff)
downloadlinux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.tar.xz
linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.zip
Adding upstream version 5.10.209.upstream/5.10.209
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'net/nfc/core.c')
-rw-r--r--net/nfc/core.c1239
1 files changed, 1239 insertions, 0 deletions
diff --git a/net/nfc/core.c b/net/nfc/core.c
new file mode 100644
index 000000000..10a3d740d
--- /dev/null
+++ b/net/nfc/core.c
@@ -0,0 +1,1239 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2011 Instituto Nokia de Tecnologia
+ *
+ * Authors:
+ * Lauro Ramos Venancio <lauro.venancio@openbossa.org>
+ * Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/rfkill.h>
+#include <linux/nfc.h>
+
+#include <net/genetlink.h>
+
+#include "nfc.h"
+
+#define VERSION "0.1"
+
+#define NFC_CHECK_PRES_FREQ_MS 2000
+
+int nfc_devlist_generation;
+DEFINE_MUTEX(nfc_devlist_mutex);
+
+/* NFC device ID bitmap */
+static DEFINE_IDA(nfc_index_ida);
+
+int nfc_fw_download(struct nfc_dev *dev, const char *firmware_name)
+{
+ int rc = 0;
+
+ pr_debug("%s do firmware %s\n", dev_name(&dev->dev), firmware_name);
+
+ device_lock(&dev->dev);
+
+ if (dev->shutting_down) {
+ rc = -ENODEV;
+ goto error;
+ }
+
+ if (dev->dev_up) {
+ rc = -EBUSY;
+ goto error;
+ }
+
+ if (!dev->ops->fw_download) {
+ rc = -EOPNOTSUPP;
+ goto error;
+ }
+
+ dev->fw_download_in_progress = true;
+ rc = dev->ops->fw_download(dev, firmware_name);
+ if (rc)
+ dev->fw_download_in_progress = false;
+
+error:
+ device_unlock(&dev->dev);
+ return rc;
+}
+
+/**
+ * nfc_fw_download_done - inform that a firmware download was completed
+ *
+ * @dev: The nfc device to which firmware was downloaded
+ * @firmware_name: The firmware filename
+ * @result: The positive value of a standard errno value
+ */
+int nfc_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
+ u32 result)
+{
+ dev->fw_download_in_progress = false;
+
+ return nfc_genl_fw_download_done(dev, firmware_name, result);
+}
+EXPORT_SYMBOL(nfc_fw_download_done);
+
+/**
+ * nfc_dev_up - turn on the NFC device
+ *
+ * @dev: The nfc device to be turned on
+ *
+ * The device remains up until the nfc_dev_down function is called.
+ */
+int nfc_dev_up(struct nfc_dev *dev)
+{
+ int rc = 0;
+
+ pr_debug("dev_name=%s\n", dev_name(&dev->dev));
+
+ device_lock(&dev->dev);
+
+ if (dev->shutting_down) {
+ rc = -ENODEV;
+ goto error;
+ }
+
+ if (dev->rfkill && rfkill_blocked(dev->rfkill)) {
+ rc = -ERFKILL;
+ goto error;
+ }
+
+ if (dev->fw_download_in_progress) {
+ rc = -EBUSY;
+ goto error;
+ }
+
+ if (dev->dev_up) {
+ rc = -EALREADY;
+ goto error;
+ }
+
+ if (dev->ops->dev_up)
+ rc = dev->ops->dev_up(dev);
+
+ if (!rc)
+ dev->dev_up = true;
+
+ /* We have to enable the device before discovering SEs */
+ if (dev->ops->discover_se && dev->ops->discover_se(dev))
+ pr_err("SE discovery failed\n");
+
+error:
+ device_unlock(&dev->dev);
+ return rc;
+}
+
+/**
+ * nfc_dev_down - turn off the NFC device
+ *
+ * @dev: The nfc device to be turned off
+ */
+int nfc_dev_down(struct nfc_dev *dev)
+{
+ int rc = 0;
+
+ pr_debug("dev_name=%s\n", dev_name(&dev->dev));
+
+ device_lock(&dev->dev);
+
+ if (dev->shutting_down) {
+ rc = -ENODEV;
+ goto error;
+ }
+
+ if (!dev->dev_up) {
+ rc = -EALREADY;
+ goto error;
+ }
+
+ if (dev->polling || dev->active_target) {
+ rc = -EBUSY;
+ goto error;
+ }
+
+ if (dev->ops->dev_down)
+ dev->ops->dev_down(dev);
+
+ dev->dev_up = false;
+
+error:
+ device_unlock(&dev->dev);
+ return rc;
+}
+
+static int nfc_rfkill_set_block(void *data, bool blocked)
+{
+ struct nfc_dev *dev = data;
+
+ pr_debug("%s blocked %d", dev_name(&dev->dev), blocked);
+
+ if (!blocked)
+ return 0;
+
+ nfc_dev_down(dev);
+
+ return 0;
+}
+
+static const struct rfkill_ops nfc_rfkill_ops = {
+ .set_block = nfc_rfkill_set_block,
+};
+
+/**
+ * nfc_start_poll - start polling for nfc targets
+ *
+ * @dev: The nfc device that must start polling
+ * @protocols: bitset of nfc protocols that must be used for polling
+ *
+ * The device remains polling for targets until a target is found or
+ * the nfc_stop_poll function is called.
+ */
+int nfc_start_poll(struct nfc_dev *dev, u32 im_protocols, u32 tm_protocols)
+{
+ int rc;
+
+ pr_debug("dev_name %s initiator protocols 0x%x target protocols 0x%x\n",
+ dev_name(&dev->dev), im_protocols, tm_protocols);
+
+ if (!im_protocols && !tm_protocols)
+ return -EINVAL;
+
+ device_lock(&dev->dev);
+
+ if (dev->shutting_down) {
+ rc = -ENODEV;
+ goto error;
+ }
+
+ if (!dev->dev_up) {
+ rc = -ENODEV;
+ goto error;
+ }
+
+ if (dev->polling) {
+ rc = -EBUSY;
+ goto error;
+ }
+
+ rc = dev->ops->start_poll(dev, im_protocols, tm_protocols);
+ if (!rc) {
+ dev->polling = true;
+ dev->rf_mode = NFC_RF_NONE;
+ }
+
+error:
+ device_unlock(&dev->dev);
+ return rc;
+}
+
+/**
+ * nfc_stop_poll - stop polling for nfc targets
+ *
+ * @dev: The nfc device that must stop polling
+ */
+int nfc_stop_poll(struct nfc_dev *dev)
+{
+ int rc = 0;
+
+ pr_debug("dev_name=%s\n", dev_name(&dev->dev));
+
+ device_lock(&dev->dev);
+
+ if (dev->shutting_down) {
+ rc = -ENODEV;
+ goto error;
+ }
+
+ if (!dev->polling) {
+ rc = -EINVAL;
+ goto error;
+ }
+
+ dev->ops->stop_poll(dev);
+ dev->polling = false;
+ dev->rf_mode = NFC_RF_NONE;
+
+error:
+ device_unlock(&dev->dev);
+ return rc;
+}
+
+static struct nfc_target *nfc_find_target(struct nfc_dev *dev, u32 target_idx)
+{
+ int i;
+
+ for (i = 0; i < dev->n_targets; i++) {
+ if (dev->targets[i].idx == target_idx)
+ return &dev->targets[i];
+ }
+
+ return NULL;
+}
+
+int nfc_dep_link_up(struct nfc_dev *dev, int target_index, u8 comm_mode)
+{
+ int rc = 0;
+ u8 *gb;
+ size_t gb_len;
+ struct nfc_target *target;
+
+ pr_debug("dev_name=%s comm %d\n", dev_name(&dev->dev), comm_mode);
+
+ if (!dev->ops->dep_link_up)
+ return -EOPNOTSUPP;
+
+ device_lock(&dev->dev);
+
+ if (dev->shutting_down) {
+ rc = -ENODEV;
+ goto error;
+ }
+
+ if (dev->dep_link_up == true) {
+ rc = -EALREADY;
+ goto error;
+ }
+
+ gb = nfc_llcp_general_bytes(dev, &gb_len);
+ if (gb_len > NFC_MAX_GT_LEN) {
+ rc = -EINVAL;
+ goto error;
+ }
+
+ target = nfc_find_target(dev, target_index);
+ if (target == NULL) {
+ rc = -ENOTCONN;
+ goto error;
+ }
+
+ rc = dev->ops->dep_link_up(dev, target, comm_mode, gb, gb_len);
+ if (!rc) {
+ dev->active_target = target;
+ dev->rf_mode = NFC_RF_INITIATOR;
+ }
+
+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 (dev->shutting_down) {
+ rc = -ENODEV;
+ goto error;
+ }
+
+ if (dev->dep_link_up == false) {
+ rc = -EALREADY;
+ goto error;
+ }
+
+ rc = dev->ops->dep_link_down(dev);
+ if (!rc) {
+ dev->dep_link_up = false;
+ dev->active_target = NULL;
+ dev->rf_mode = NFC_RF_NONE;
+ nfc_llcp_mac_is_down(dev);
+ 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;
+
+ if (!dev->active_target && rf_mode == NFC_RF_INITIATOR) {
+ struct nfc_target *target;
+
+ target = nfc_find_target(dev, target_idx);
+ if (target == NULL)
+ return -ENOTCONN;
+
+ dev->active_target = target;
+ }
+
+ dev->polling = false;
+ dev->rf_mode = rf_mode;
+
+ nfc_llcp_mac_is_up(dev, target_idx, comm_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
+ *
+ * @dev: The nfc device that found the target
+ * @target_idx: index of the target that must be activated
+ * @protocol: nfc protocol that will be used for data exchange
+ */
+int nfc_activate_target(struct nfc_dev *dev, u32 target_idx, u32 protocol)
+{
+ int rc;
+ struct nfc_target *target;
+
+ pr_debug("dev_name=%s target_idx=%u protocol=%u\n",
+ dev_name(&dev->dev), target_idx, protocol);
+
+ device_lock(&dev->dev);
+
+ if (dev->shutting_down) {
+ rc = -ENODEV;
+ goto error;
+ }
+
+ if (dev->active_target) {
+ rc = -EBUSY;
+ goto error;
+ }
+
+ target = nfc_find_target(dev, target_idx);
+ if (target == NULL) {
+ rc = -ENOTCONN;
+ goto error;
+ }
+
+ rc = dev->ops->activate_target(dev, target, protocol);
+ if (!rc) {
+ dev->active_target = target;
+ dev->rf_mode = NFC_RF_INITIATOR;
+
+ if (dev->ops->check_presence && !dev->shutting_down)
+ mod_timer(&dev->check_pres_timer, jiffies +
+ msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
+ }
+
+error:
+ device_unlock(&dev->dev);
+ return rc;
+}
+
+/**
+ * nfc_deactivate_target - deactivate a nfc target
+ *
+ * @dev: The nfc device that found the target
+ * @target_idx: index of the target that must be deactivated
+ */
+int nfc_deactivate_target(struct nfc_dev *dev, u32 target_idx, u8 mode)
+{
+ int rc = 0;
+
+ pr_debug("dev_name=%s target_idx=%u\n",
+ dev_name(&dev->dev), target_idx);
+
+ device_lock(&dev->dev);
+
+ if (dev->shutting_down) {
+ rc = -ENODEV;
+ goto error;
+ }
+
+ if (dev->active_target == NULL) {
+ rc = -ENOTCONN;
+ goto error;
+ }
+
+ if (dev->active_target->idx != target_idx) {
+ rc = -ENOTCONN;
+ goto error;
+ }
+
+ if (dev->ops->check_presence)
+ del_timer_sync(&dev->check_pres_timer);
+
+ dev->ops->deactivate_target(dev, dev->active_target, mode);
+ dev->active_target = NULL;
+
+error:
+ device_unlock(&dev->dev);
+ return rc;
+}
+
+/**
+ * nfc_data_exchange - transceive data
+ *
+ * @dev: The nfc device that found the target
+ * @target_idx: index of the target
+ * @skb: data to be sent
+ * @cb: callback called when the response is received
+ * @cb_context: parameter for the callback function
+ *
+ * The user must wait for the callback before calling this function again.
+ */
+int nfc_data_exchange(struct nfc_dev *dev, u32 target_idx, struct sk_buff *skb,
+ data_exchange_cb_t cb, void *cb_context)
+{
+ int rc;
+
+ pr_debug("dev_name=%s target_idx=%u skb->len=%u\n",
+ dev_name(&dev->dev), target_idx, skb->len);
+
+ device_lock(&dev->dev);
+
+ if (dev->shutting_down) {
+ rc = -ENODEV;
+ kfree_skb(skb);
+ goto error;
+ }
+
+ if (dev->rf_mode == NFC_RF_INITIATOR && dev->active_target != NULL) {
+ if (dev->active_target->idx != target_idx) {
+ rc = -EADDRNOTAVAIL;
+ kfree_skb(skb);
+ goto error;
+ }
+
+ if (dev->ops->check_presence)
+ del_timer_sync(&dev->check_pres_timer);
+
+ rc = dev->ops->im_transceive(dev, dev->active_target, skb, cb,
+ cb_context);
+
+ if (!rc && dev->ops->check_presence && !dev->shutting_down)
+ mod_timer(&dev->check_pres_timer, jiffies +
+ msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
+ } else if (dev->rf_mode == NFC_RF_TARGET && dev->ops->tm_send != NULL) {
+ rc = dev->ops->tm_send(dev, skb);
+ } else {
+ rc = -ENOTCONN;
+ kfree_skb(skb);
+ goto error;
+ }
+
+
+error:
+ device_unlock(&dev->dev);
+ return rc;
+}
+
+struct nfc_se *nfc_find_se(struct nfc_dev *dev, u32 se_idx)
+{
+ struct nfc_se *se;
+
+ list_for_each_entry(se, &dev->secure_elements, list)
+ if (se->idx == se_idx)
+ return se;
+
+ return NULL;
+}
+EXPORT_SYMBOL(nfc_find_se);
+
+int nfc_enable_se(struct nfc_dev *dev, u32 se_idx)
+{
+ struct nfc_se *se;
+ int rc;
+
+ pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
+
+ device_lock(&dev->dev);
+
+ if (dev->shutting_down) {
+ rc = -ENODEV;
+ goto error;
+ }
+
+ if (!dev->dev_up) {
+ rc = -ENODEV;
+ goto error;
+ }
+
+ if (dev->polling) {
+ rc = -EBUSY;
+ goto error;
+ }
+
+ if (!dev->ops->enable_se || !dev->ops->disable_se) {
+ rc = -EOPNOTSUPP;
+ goto error;
+ }
+
+ se = nfc_find_se(dev, se_idx);
+ if (!se) {
+ rc = -EINVAL;
+ goto error;
+ }
+
+ if (se->state == NFC_SE_ENABLED) {
+ rc = -EALREADY;
+ goto error;
+ }
+
+ rc = dev->ops->enable_se(dev, se_idx);
+ if (rc >= 0)
+ se->state = NFC_SE_ENABLED;
+
+error:
+ device_unlock(&dev->dev);
+ return rc;
+}
+
+int nfc_disable_se(struct nfc_dev *dev, u32 se_idx)
+{
+ struct nfc_se *se;
+ int rc;
+
+ pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
+
+ device_lock(&dev->dev);
+
+ if (dev->shutting_down) {
+ rc = -ENODEV;
+ goto error;
+ }
+
+ if (!dev->dev_up) {
+ rc = -ENODEV;
+ goto error;
+ }
+
+ if (!dev->ops->enable_se || !dev->ops->disable_se) {
+ rc = -EOPNOTSUPP;
+ goto error;
+ }
+
+ se = nfc_find_se(dev, se_idx);
+ if (!se) {
+ rc = -EINVAL;
+ goto error;
+ }
+
+ if (se->state == NFC_SE_DISABLED) {
+ rc = -EALREADY;
+ goto error;
+ }
+
+ rc = dev->ops->disable_se(dev, se_idx);
+ if (rc >= 0)
+ se->state = NFC_SE_DISABLED;
+
+error:
+ device_unlock(&dev->dev);
+ return rc;
+}
+
+int nfc_set_remote_general_bytes(struct nfc_dev *dev, const u8 *gb, u8 gb_len)
+{
+ pr_debug("dev_name=%s gb_len=%d\n", dev_name(&dev->dev), gb_len);
+
+ return nfc_llcp_set_remote_gb(dev, gb, gb_len);
+}
+EXPORT_SYMBOL(nfc_set_remote_general_bytes);
+
+u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len)
+{
+ pr_debug("dev_name=%s\n", dev_name(&dev->dev));
+
+ return nfc_llcp_general_bytes(dev, gb_len);
+}
+EXPORT_SYMBOL(nfc_get_local_general_bytes);
+
+int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb)
+{
+ /* Only LLCP target mode for now */
+ if (dev->dep_link_up == false) {
+ kfree_skb(skb);
+ return -ENOLINK;
+ }
+
+ return nfc_llcp_data_received(dev, skb);
+}
+EXPORT_SYMBOL(nfc_tm_data_received);
+
+int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode,
+ const u8 *gb, size_t gb_len)
+{
+ int rc;
+
+ device_lock(&dev->dev);
+
+ dev->polling = false;
+
+ if (gb != NULL) {
+ rc = nfc_set_remote_general_bytes(dev, gb, gb_len);
+ if (rc < 0)
+ goto out;
+ }
+
+ dev->rf_mode = NFC_RF_TARGET;
+
+ if (protocol == NFC_PROTO_NFC_DEP_MASK)
+ nfc_dep_link_is_up(dev, 0, comm_mode, NFC_RF_TARGET);
+
+ rc = nfc_genl_tm_activated(dev, protocol);
+
+out:
+ device_unlock(&dev->dev);
+
+ return rc;
+}
+EXPORT_SYMBOL(nfc_tm_activated);
+
+int nfc_tm_deactivated(struct nfc_dev *dev)
+{
+ dev->dep_link_up = false;
+ dev->rf_mode = NFC_RF_NONE;
+
+ return nfc_genl_tm_deactivated(dev);
+}
+EXPORT_SYMBOL(nfc_tm_deactivated);
+
+/**
+ * nfc_alloc_send_skb - allocate a skb for data exchange responses
+ *
+ * @size: size to allocate
+ */
+struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk,
+ unsigned int flags, unsigned int size,
+ unsigned int *err)
+{
+ struct sk_buff *skb;
+ unsigned int total_size;
+
+ total_size = size +
+ dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
+
+ skb = sock_alloc_send_skb(sk, total_size, flags & MSG_DONTWAIT, err);
+ if (skb)
+ skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
+
+ return skb;
+}
+
+/**
+ * nfc_alloc_recv_skb - allocate a skb for data exchange responses
+ *
+ * @size: size to allocate
+ * @gfp: gfp flags
+ */
+struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp)
+{
+ struct sk_buff *skb;
+ unsigned int total_size;
+
+ total_size = size + 1;
+ skb = alloc_skb(total_size, gfp);
+
+ if (skb)
+ skb_reserve(skb, 1);
+
+ return skb;
+}
+EXPORT_SYMBOL(nfc_alloc_recv_skb);
+
+/**
+ * nfc_targets_found - inform that targets were found
+ *
+ * @dev: The nfc device that found the targets
+ * @targets: array of nfc targets found
+ * @n_targets: targets array size
+ *
+ * The device driver must call this function when one or many nfc targets
+ * are found. After calling this function, the device driver must stop
+ * polling for targets.
+ * NOTE: This function can be called with targets=NULL and n_targets=0 to
+ * notify a driver error, meaning that the polling operation cannot complete.
+ * IMPORTANT: this function must not be called from an atomic context.
+ * In addition, it must also not be called from a context that would prevent
+ * the NFC Core to call other nfc ops entry point concurrently.
+ */
+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);
+
+ for (i = 0; i < n_targets; i++)
+ targets[i].idx = dev->target_next_idx++;
+
+ device_lock(&dev->dev);
+
+ if (dev->polling == false) {
+ device_unlock(&dev->dev);
+ return 0;
+ }
+
+ dev->polling = false;
+
+ dev->targets_generation++;
+
+ kfree(dev->targets);
+ dev->targets = NULL;
+
+ if (targets) {
+ dev->targets = kmemdup(targets,
+ n_targets * sizeof(struct nfc_target),
+ GFP_ATOMIC);
+
+ if (!dev->targets) {
+ dev->n_targets = 0;
+ device_unlock(&dev->dev);
+ return -ENOMEM;
+ }
+ }
+
+ dev->n_targets = n_targets;
+ device_unlock(&dev->dev);
+
+ nfc_genl_targets_found(dev);
+
+ return 0;
+}
+EXPORT_SYMBOL(nfc_targets_found);
+
+/**
+ * nfc_target_lost - inform that an activated target went out of field
+ *
+ * @dev: The nfc device that had the activated target in field
+ * @target_idx: the nfc index of the target
+ *
+ * The device driver must call this function when the activated target
+ * goes out of the field.
+ * IMPORTANT: this function must not be called from an atomic context.
+ * In addition, it must also not be called from a context that would prevent
+ * the NFC Core to call other nfc ops entry point concurrently.
+ */
+int nfc_target_lost(struct nfc_dev *dev, u32 target_idx)
+{
+ struct nfc_target *tg;
+ int i;
+
+ pr_debug("dev_name %s n_target %d\n", dev_name(&dev->dev), target_idx);
+
+ device_lock(&dev->dev);
+
+ for (i = 0; i < dev->n_targets; i++) {
+ tg = &dev->targets[i];
+ if (tg->idx == target_idx)
+ break;
+ }
+
+ if (i == dev->n_targets) {
+ device_unlock(&dev->dev);
+ return -EINVAL;
+ }
+
+ dev->targets_generation++;
+ dev->n_targets--;
+ dev->active_target = NULL;
+
+ if (dev->n_targets) {
+ memcpy(&dev->targets[i], &dev->targets[i + 1],
+ (dev->n_targets - i) * sizeof(struct nfc_target));
+ } else {
+ kfree(dev->targets);
+ dev->targets = NULL;
+ }
+
+ device_unlock(&dev->dev);
+
+ nfc_genl_target_lost(dev, target_idx);
+
+ return 0;
+}
+EXPORT_SYMBOL(nfc_target_lost);
+
+inline void nfc_driver_failure(struct nfc_dev *dev, int err)
+{
+ nfc_targets_found(dev, NULL, 0);
+}
+EXPORT_SYMBOL(nfc_driver_failure);
+
+int nfc_add_se(struct nfc_dev *dev, u32 se_idx, u16 type)
+{
+ struct nfc_se *se;
+ int rc;
+
+ pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
+
+ se = nfc_find_se(dev, se_idx);
+ if (se)
+ return -EALREADY;
+
+ se = kzalloc(sizeof(struct nfc_se), GFP_KERNEL);
+ if (!se)
+ return -ENOMEM;
+
+ se->idx = se_idx;
+ se->type = type;
+ se->state = NFC_SE_DISABLED;
+ INIT_LIST_HEAD(&se->list);
+
+ list_add(&se->list, &dev->secure_elements);
+
+ rc = nfc_genl_se_added(dev, se_idx, type);
+ if (rc < 0) {
+ list_del(&se->list);
+ kfree(se);
+
+ return rc;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(nfc_add_se);
+
+int nfc_remove_se(struct nfc_dev *dev, u32 se_idx)
+{
+ struct nfc_se *se, *n;
+ int rc;
+
+ pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
+
+ list_for_each_entry_safe(se, n, &dev->secure_elements, list)
+ if (se->idx == se_idx) {
+ rc = nfc_genl_se_removed(dev, se_idx);
+ if (rc < 0)
+ return rc;
+
+ list_del(&se->list);
+ kfree(se);
+
+ return 0;
+ }
+
+ return -EINVAL;
+}
+EXPORT_SYMBOL(nfc_remove_se);
+
+int nfc_se_transaction(struct nfc_dev *dev, u8 se_idx,
+ struct nfc_evt_transaction *evt_transaction)
+{
+ int rc;
+
+ pr_debug("transaction: %x\n", se_idx);
+
+ device_lock(&dev->dev);
+
+ if (!evt_transaction) {
+ rc = -EPROTO;
+ goto out;
+ }
+
+ rc = nfc_genl_se_transaction(dev, se_idx, evt_transaction);
+out:
+ device_unlock(&dev->dev);
+ return rc;
+}
+EXPORT_SYMBOL(nfc_se_transaction);
+
+int nfc_se_connectivity(struct nfc_dev *dev, u8 se_idx)
+{
+ int rc;
+
+ pr_debug("connectivity: %x\n", se_idx);
+
+ device_lock(&dev->dev);
+ rc = nfc_genl_se_connectivity(dev, se_idx);
+ device_unlock(&dev->dev);
+ return rc;
+}
+EXPORT_SYMBOL(nfc_se_connectivity);
+
+static void nfc_release(struct device *d)
+{
+ struct nfc_dev *dev = to_nfc_dev(d);
+ struct nfc_se *se, *n;
+
+ pr_debug("dev_name=%s\n", dev_name(&dev->dev));
+
+ nfc_genl_data_exit(&dev->genl_data);
+ kfree(dev->targets);
+
+ list_for_each_entry_safe(se, n, &dev->secure_elements, list) {
+ nfc_genl_se_removed(dev, se->idx);
+ list_del(&se->list);
+ kfree(se);
+ }
+
+ ida_simple_remove(&nfc_index_ida, dev->idx);
+
+ kfree(dev);
+}
+
+static void nfc_check_pres_work(struct work_struct *work)
+{
+ struct nfc_dev *dev = container_of(work, struct nfc_dev,
+ check_pres_work);
+ int rc;
+
+ device_lock(&dev->dev);
+
+ if (dev->active_target && timer_pending(&dev->check_pres_timer) == 0) {
+ rc = dev->ops->check_presence(dev, dev->active_target);
+ if (rc == -EOPNOTSUPP)
+ goto exit;
+ if (rc) {
+ u32 active_target_idx = dev->active_target->idx;
+ device_unlock(&dev->dev);
+ nfc_target_lost(dev, active_target_idx);
+ return;
+ }
+
+ if (!dev->shutting_down)
+ mod_timer(&dev->check_pres_timer, jiffies +
+ msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
+ }
+
+exit:
+ device_unlock(&dev->dev);
+}
+
+static void nfc_check_pres_timeout(struct timer_list *t)
+{
+ struct nfc_dev *dev = from_timer(dev, t, check_pres_timer);
+
+ schedule_work(&dev->check_pres_work);
+}
+
+struct class nfc_class = {
+ .name = "nfc",
+ .dev_release = nfc_release,
+};
+EXPORT_SYMBOL(nfc_class);
+
+static int match_idx(struct device *d, const void *data)
+{
+ struct nfc_dev *dev = to_nfc_dev(d);
+ const unsigned int *idx = data;
+
+ return dev->idx == *idx;
+}
+
+struct nfc_dev *nfc_get_device(unsigned int idx)
+{
+ struct device *d;
+
+ d = class_find_device(&nfc_class, NULL, &idx, match_idx);
+ if (!d)
+ return NULL;
+
+ return to_nfc_dev(d);
+}
+
+/**
+ * nfc_allocate_device - allocate a new nfc device
+ *
+ * @ops: device operations
+ * @supported_protocols: NFC protocols supported by the device
+ */
+struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
+ u32 supported_protocols,
+ int tx_headroom, int tx_tailroom)
+{
+ struct nfc_dev *dev;
+ int rc;
+
+ if (!ops->start_poll || !ops->stop_poll || !ops->activate_target ||
+ !ops->deactivate_target || !ops->im_transceive)
+ return NULL;
+
+ if (!supported_protocols)
+ return NULL;
+
+ dev = kzalloc(sizeof(struct nfc_dev), GFP_KERNEL);
+ if (!dev)
+ return NULL;
+
+ rc = ida_simple_get(&nfc_index_ida, 0, 0, GFP_KERNEL);
+ if (rc < 0)
+ goto err_free_dev;
+ dev->idx = rc;
+
+ dev->dev.class = &nfc_class;
+ dev_set_name(&dev->dev, "nfc%d", dev->idx);
+ device_initialize(&dev->dev);
+
+ dev->ops = ops;
+ dev->supported_protocols = supported_protocols;
+ dev->tx_headroom = tx_headroom;
+ dev->tx_tailroom = tx_tailroom;
+ INIT_LIST_HEAD(&dev->secure_elements);
+
+ nfc_genl_data_init(&dev->genl_data);
+
+ dev->rf_mode = NFC_RF_NONE;
+
+ /* first generation must not be 0 */
+ dev->targets_generation = 1;
+
+ if (ops->check_presence) {
+ timer_setup(&dev->check_pres_timer, nfc_check_pres_timeout, 0);
+ INIT_WORK(&dev->check_pres_work, nfc_check_pres_work);
+ }
+
+ return dev;
+
+err_free_dev:
+ kfree(dev);
+
+ return NULL;
+}
+EXPORT_SYMBOL(nfc_allocate_device);
+
+/**
+ * nfc_register_device - register a nfc device in the nfc subsystem
+ *
+ * @dev: The nfc device to register
+ */
+int nfc_register_device(struct nfc_dev *dev)
+{
+ int rc;
+
+ pr_debug("dev_name=%s\n", dev_name(&dev->dev));
+
+ mutex_lock(&nfc_devlist_mutex);
+ nfc_devlist_generation++;
+ rc = device_add(&dev->dev);
+ mutex_unlock(&nfc_devlist_mutex);
+
+ if (rc < 0)
+ return rc;
+
+ rc = nfc_llcp_register_device(dev);
+ if (rc)
+ pr_err("Could not register llcp device\n");
+
+ device_lock(&dev->dev);
+ dev->rfkill = rfkill_alloc(dev_name(&dev->dev), &dev->dev,
+ RFKILL_TYPE_NFC, &nfc_rfkill_ops, dev);
+ if (dev->rfkill) {
+ if (rfkill_register(dev->rfkill) < 0) {
+ rfkill_destroy(dev->rfkill);
+ dev->rfkill = NULL;
+ }
+ }
+ dev->shutting_down = false;
+ device_unlock(&dev->dev);
+
+ rc = nfc_genl_device_added(dev);
+ if (rc)
+ pr_debug("The userspace won't be notified that the device %s was added\n",
+ dev_name(&dev->dev));
+
+ return 0;
+}
+EXPORT_SYMBOL(nfc_register_device);
+
+/**
+ * nfc_unregister_device - unregister a nfc device in the nfc subsystem
+ *
+ * @dev: The nfc device to unregister
+ */
+void nfc_unregister_device(struct nfc_dev *dev)
+{
+ int rc;
+
+ pr_debug("dev_name=%s\n", dev_name(&dev->dev));
+
+ rc = nfc_genl_device_removed(dev);
+ if (rc)
+ pr_debug("The userspace won't be notified that the device %s "
+ "was removed\n", dev_name(&dev->dev));
+
+ device_lock(&dev->dev);
+ if (dev->rfkill) {
+ rfkill_unregister(dev->rfkill);
+ rfkill_destroy(dev->rfkill);
+ dev->rfkill = NULL;
+ }
+ dev->shutting_down = true;
+ device_unlock(&dev->dev);
+
+ if (dev->ops->check_presence) {
+ del_timer_sync(&dev->check_pres_timer);
+ cancel_work_sync(&dev->check_pres_work);
+ }
+
+ nfc_llcp_unregister_device(dev);
+
+ mutex_lock(&nfc_devlist_mutex);
+ nfc_devlist_generation++;
+ device_del(&dev->dev);
+ mutex_unlock(&nfc_devlist_mutex);
+}
+EXPORT_SYMBOL(nfc_unregister_device);
+
+static int __init nfc_init(void)
+{
+ int rc;
+
+ pr_info("NFC Core ver %s\n", VERSION);
+
+ rc = class_register(&nfc_class);
+ if (rc)
+ return rc;
+
+ rc = nfc_genl_init();
+ if (rc)
+ goto err_genl;
+
+ /* the first generation must not be 0 */
+ nfc_devlist_generation = 1;
+
+ rc = rawsock_init();
+ if (rc)
+ goto err_rawsock;
+
+ rc = nfc_llcp_init();
+ if (rc)
+ goto err_llcp_sock;
+
+ rc = af_nfc_init();
+ if (rc)
+ goto err_af_nfc;
+
+ return 0;
+
+err_af_nfc:
+ nfc_llcp_exit();
+err_llcp_sock:
+ rawsock_exit();
+err_rawsock:
+ nfc_genl_exit();
+err_genl:
+ class_unregister(&nfc_class);
+ return rc;
+}
+
+static void __exit nfc_exit(void)
+{
+ af_nfc_exit();
+ nfc_llcp_exit();
+ rawsock_exit();
+ nfc_genl_exit();
+ class_unregister(&nfc_class);
+}
+
+subsys_initcall(nfc_init);
+module_exit(nfc_exit);
+
+MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
+MODULE_DESCRIPTION("NFC Core ver " VERSION);
+MODULE_VERSION(VERSION);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NETPROTO(PF_NFC);
+MODULE_ALIAS_GENL_FAMILY(NFC_GENL_NAME);