summaryrefslogtreecommitdiff
path: root/net/nfc
diff options
context:
space:
mode:
Diffstat (limited to 'net/nfc')
-rw-r--r--net/nfc/Kconfig16
-rw-r--r--net/nfc/Makefile7
-rw-r--r--net/nfc/core.c365
-rw-r--r--net/nfc/nfc.h78
4 files changed, 466 insertions, 0 deletions
diff --git a/net/nfc/Kconfig b/net/nfc/Kconfig
new file mode 100644
index 000000000000..33e095b124b3
--- /dev/null
+++ b/net/nfc/Kconfig
@@ -0,0 +1,16 @@
+#
+# NFC sybsystem configuration
+#
+
+menuconfig NFC
+ depends on NET && EXPERIMENTAL
+ tristate "NFC subsystem support (EXPERIMENTAL)"
+ default n
+ help
+ Say Y here if you want to build support for NFC (Near field
+ communication) devices.
+
+ To compile this support as a module, choose M here: the module will
+ be called nfc.
+
+source "drivers/nfc/Kconfig"
diff --git a/net/nfc/Makefile b/net/nfc/Makefile
new file mode 100644
index 000000000000..28bee5958687
--- /dev/null
+++ b/net/nfc/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for the Linux NFC subsystem.
+#
+
+obj-$(CONFIG_NFC) += nfc.o
+
+nfc-objs := core.o
diff --git a/net/nfc/core.c b/net/nfc/core.c
new file mode 100644
index 000000000000..19f8035a1ba9
--- /dev/null
+++ b/net/nfc/core.c
@@ -0,0 +1,365 @@
+/*
+ * Copyright (C) 2011 Instituto Nokia de Tecnologia
+ *
+ * Authors:
+ * Lauro Ramos Venancio <lauro.venancio@openbossa.org>
+ * Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the
+ * Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+#include "nfc.h"
+
+#define VERSION "0.1"
+
+int nfc_devlist_generation;
+DEFINE_MUTEX(nfc_devlist_mutex);
+
+int nfc_printk(const char *level, const char *format, ...)
+{
+ struct va_format vaf;
+ va_list args;
+ int r;
+
+ va_start(args, format);
+
+ vaf.fmt = format;
+ vaf.va = &args;
+
+ r = printk("%sNFC: %pV\n", level, &vaf);
+
+ va_end(args);
+
+ return r;
+}
+EXPORT_SYMBOL(nfc_printk);
+
+/**
+ * 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 protocols)
+{
+ int rc;
+
+ nfc_dbg("dev_name=%s protocols=0x%x", dev_name(&dev->dev), protocols);
+
+ if (!protocols)
+ return -EINVAL;
+
+ device_lock(&dev->dev);
+
+ if (!device_is_registered(&dev->dev)) {
+ rc = -ENODEV;
+ goto error;
+ }
+
+ if (dev->polling) {
+ rc = -EBUSY;
+ goto error;
+ }
+
+ rc = dev->ops->start_poll(dev, protocols);
+ if (!rc)
+ dev->polling = true;
+
+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;
+
+ nfc_dbg("dev_name=%s", dev_name(&dev->dev));
+
+ device_lock(&dev->dev);
+
+ if (!device_is_registered(&dev->dev)) {
+ rc = -ENODEV;
+ goto error;
+ }
+
+ if (!dev->polling) {
+ rc = -EINVAL;
+ goto error;
+ }
+
+ dev->ops->stop_poll(dev);
+ dev->polling = false;
+
+error:
+ device_unlock(&dev->dev);
+ return rc;
+}
+
+/**
+ * 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;
+
+ nfc_dbg("dev_name=%s target_idx=%u protocol=%u", dev_name(&dev->dev),
+ target_idx, protocol);
+
+ device_lock(&dev->dev);
+
+ if (!device_is_registered(&dev->dev)) {
+ rc = -ENODEV;
+ goto error;
+ }
+
+ rc = dev->ops->activate_target(dev, target_idx, protocol);
+
+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)
+{
+ int rc = 0;
+
+ nfc_dbg("dev_name=%s target_idx=%u", dev_name(&dev->dev), target_idx);
+
+ device_lock(&dev->dev);
+
+ if (!device_is_registered(&dev->dev)) {
+ rc = -ENODEV;
+ goto error;
+ }
+
+ dev->ops->deactivate_target(dev, target_idx);
+
+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;
+
+ nfc_dbg("dev_name=%s target_idx=%u skb->len=%u", dev_name(&dev->dev),
+ target_idx, skb->len);
+
+ device_lock(&dev->dev);
+
+ if (!device_is_registered(&dev->dev)) {
+ rc = -ENODEV;
+ kfree_skb(skb);
+ goto error;
+ }
+
+ rc = dev->ops->data_exchange(dev, target_idx, skb, cb, cb_context);
+
+error:
+ device_unlock(&dev->dev);
+ return rc;
+}
+
+/**
+ * nfc_alloc_skb - allocate a skb for data exchange responses
+ *
+ * @size: size to allocate
+ * @gfp: gfp flags
+ */
+struct sk_buff *nfc_alloc_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_skb);
+
+static void nfc_release(struct device *d)
+{
+ struct nfc_dev *dev = to_nfc_dev(d);
+
+ nfc_dbg("dev_name=%s", dev_name(&dev->dev));
+
+ kfree(dev);
+}
+
+struct class nfc_class = {
+ .name = "nfc",
+ .dev_release = nfc_release,
+};
+EXPORT_SYMBOL(nfc_class);
+
+static int match_idx(struct device *d, void *data)
+{
+ struct nfc_dev *dev = to_nfc_dev(d);
+ unsigned *idx = data;
+
+ return dev->idx == *idx;
+}
+
+struct nfc_dev *nfc_get_device(unsigned 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)
+{
+ static atomic_t dev_no = ATOMIC_INIT(0);
+ struct nfc_dev *dev;
+
+ if (!ops->start_poll || !ops->stop_poll || !ops->activate_target ||
+ !ops->deactivate_target || !ops->data_exchange)
+ return NULL;
+
+ if (!supported_protocols)
+ return NULL;
+
+ dev = kzalloc(sizeof(struct nfc_dev), GFP_KERNEL);
+ if (!dev)
+ return NULL;
+
+ dev->dev.class = &nfc_class;
+ dev->idx = atomic_inc_return(&dev_no) - 1;
+ dev_set_name(&dev->dev, "nfc%d", dev->idx);
+ device_initialize(&dev->dev);
+
+ dev->ops = ops;
+ dev->supported_protocols = supported_protocols;
+
+ return dev;
+}
+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;
+
+ nfc_dbg("dev_name=%s", dev_name(&dev->dev));
+
+ mutex_lock(&nfc_devlist_mutex);
+ nfc_devlist_generation++;
+ rc = device_add(&dev->dev);
+ mutex_unlock(&nfc_devlist_mutex);
+
+ return rc;
+}
+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)
+{
+ nfc_dbg("dev_name=%s", dev_name(&dev->dev));
+
+ mutex_lock(&nfc_devlist_mutex);
+ nfc_devlist_generation++;
+
+ /* lock to avoid unregistering a device while an operation
+ is in progress */
+ device_lock(&dev->dev);
+ device_del(&dev->dev);
+ device_unlock(&dev->dev);
+
+ mutex_unlock(&nfc_devlist_mutex);
+}
+EXPORT_SYMBOL(nfc_unregister_device);
+
+static int __init nfc_init(void)
+{
+ nfc_info("NFC Core ver %s", VERSION);
+
+ return class_register(&nfc_class);
+}
+
+static void __exit nfc_exit(void)
+{
+ 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");
diff --git a/net/nfc/nfc.h b/net/nfc/nfc.h
new file mode 100644
index 000000000000..55f83f86fe2c
--- /dev/null
+++ b/net/nfc/nfc.h
@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2011 Instituto Nokia de Tecnologia
+ *
+ * Authors:
+ * Lauro Ramos Venancio <lauro.venancio@openbossa.org>
+ * Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the
+ * Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __LOCAL_NFC_H
+#define __LOCAL_NFC_H
+
+#include <net/nfc.h>
+
+__attribute__((format (printf, 2, 3)))
+int nfc_printk(const char *level, const char *fmt, ...);
+
+#define nfc_info(fmt, arg...) nfc_printk(KERN_INFO, fmt, ##arg)
+#define nfc_err(fmt, arg...) nfc_printk(KERN_ERR, fmt, ##arg)
+#define nfc_dbg(fmt, arg...) pr_debug(fmt "\n", ##arg)
+
+extern int nfc_devlist_generation;
+extern struct mutex nfc_devlist_mutex;
+
+struct nfc_dev *nfc_get_device(unsigned idx);
+
+static inline void nfc_put_device(struct nfc_dev *dev)
+{
+ put_device(&dev->dev);
+}
+
+static inline void nfc_device_iter_init(struct class_dev_iter *iter)
+{
+ class_dev_iter_init(iter, &nfc_class, NULL, NULL);
+}
+
+static inline struct nfc_dev *nfc_device_iter_next(struct class_dev_iter *iter)
+{
+ struct device *d = class_dev_iter_next(iter);
+ if (!d)
+ return NULL;
+
+ return to_nfc_dev(d);
+}
+
+static inline void nfc_device_iter_exit(struct class_dev_iter *iter)
+{
+ class_dev_iter_exit(iter);
+}
+
+int nfc_start_poll(struct nfc_dev *dev, u32 protocols);
+
+int nfc_stop_poll(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);
+
+int nfc_data_exchange(struct nfc_dev *dev, u32 target_idx,
+ struct sk_buff *skb,
+ data_exchange_cb_t cb,
+ void *cb_context);
+
+#endif /* __LOCAL_NFC_H */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-19 04:58:35 +0000