diff options
| -rw-r--r-- | drivers/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/Makefile | 1 | ||||
| -rw-r--r-- | drivers/nfc/Kconfig | 16 | ||||
| -rw-r--r-- | drivers/nfc/Makefile | 2 | ||||
| -rw-r--r-- | include/net/nfc.h | 135 | ||||
| -rw-r--r-- | net/Kconfig | 1 | ||||
| -rw-r--r-- | net/Makefile | 1 | ||||
| -rw-r--r-- | net/nfc/Kconfig | 16 | ||||
| -rw-r--r-- | net/nfc/Makefile | 7 | ||||
| -rw-r--r-- | net/nfc/core.c | 365 | ||||
| -rw-r--r-- | net/nfc/nfc.h | 78 |
11 files changed, 609 insertions, 15 deletions
diff --git a/drivers/Kconfig b/drivers/Kconfig index 61631edfecc..a56b0b83872 100644 --- a/drivers/Kconfig +++ b/drivers/Kconfig @@ -92,8 +92,6 @@ source "drivers/memstick/Kconfig" source "drivers/leds/Kconfig" -source "drivers/nfc/Kconfig" - source "drivers/accessibility/Kconfig" source "drivers/infiniband/Kconfig" diff --git a/drivers/Makefile b/drivers/Makefile index a29527f4ded..843cd31a849 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -120,3 +120,4 @@ obj-y += ieee802154/ obj-y += clk/ obj-$(CONFIG_HWSPINLOCK) += hwspinlock/ +obj-$(CONFIG_NFC) += nfc/ diff --git a/drivers/nfc/Kconfig b/drivers/nfc/Kconfig index ea158008534..780928918fc 100644 --- a/drivers/nfc/Kconfig +++ b/drivers/nfc/Kconfig @@ -2,17 +2,8 @@ # Near Field Communication (NFC) devices # -menuconfig NFC_DEVICES - bool "Near Field Communication (NFC) devices" - default n - ---help--- - You'll have to say Y if your computer contains an NFC device that - you want to use under Linux. - - You can say N here if you don't have any Near Field Communication - devices connected to your computer. - -if NFC_DEVICES +menu "Near Field Communication (NFC) devices" + depends on NFC config PN544_NFC tristate "PN544 NFC driver" @@ -26,5 +17,4 @@ config PN544_NFC To compile this driver as a module, choose m here. The module will be called pn544. - -endif # NFC_DEVICES +endmenu diff --git a/drivers/nfc/Makefile b/drivers/nfc/Makefile index a4efb164ec4..25296f04ccb 100644 --- a/drivers/nfc/Makefile +++ b/drivers/nfc/Makefile @@ -3,3 +3,5 @@ # obj-$(CONFIG_PN544_NFC) += pn544.o + +ccflags-$(CONFIG_NFC_DEBUG) := -DDEBUG diff --git a/include/net/nfc.h b/include/net/nfc.h new file mode 100644 index 00000000000..c57b579c830 --- /dev/null +++ b/include/net/nfc.h @@ -0,0 +1,135 @@ +/* + * 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 __NET_NFC_H +#define __NET_NFC_H + +#include <linux/device.h> +#include <linux/skbuff.h> + +#define nfc_dev_info(dev, fmt, arg...) dev_info((dev), "NFC: " fmt "\n", ## arg) +#define nfc_dev_err(dev, fmt, arg...) dev_err((dev), "NFC: " fmt "\n", ## arg) +#define nfc_dev_dbg(dev, fmt, arg...) dev_dbg((dev), fmt "\n", ## arg) + +struct nfc_dev; + +/** + * data_exchange_cb_t - Definition of nfc_data_exchange callback + * + * @context: nfc_data_exchange cb_context parameter + * @skb: response data + * @err: If an error has occurred during data exchange, it is the + * error number. Zero means no error. + * + * When a rx or tx package is lost or corrupted or the target gets out + * of the operating field, err is -EIO. + */ +typedef void (*data_exchange_cb_t)(void *context, struct sk_buff *skb, + int err); + +struct nfc_ops { + int (*start_poll)(struct nfc_dev *dev, u32 protocols); + void (*stop_poll)(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); + int (*data_exchange)(struct nfc_dev *dev, u32 target_idx, + struct sk_buff *skb, data_exchange_cb_t cb, + void *cb_context); +}; + +struct nfc_dev { + unsigned idx; + struct device dev; + bool polling; + u32 supported_protocols; + + struct nfc_ops *ops; +}; +#define to_nfc_dev(_dev) container_of(_dev, struct nfc_dev, dev) + +extern struct class nfc_class; + +struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops, + u32 supported_protocols); + +/** + * nfc_free_device - free nfc device + * + * @dev: The nfc device to free + */ +static inline void nfc_free_device(struct nfc_dev *dev) +{ + put_device(&dev->dev); +} + +int nfc_register_device(struct nfc_dev *dev); + +void nfc_unregister_device(struct nfc_dev *dev); + +/** + * nfc_set_parent_dev - set the parent device + * + * @nfc_dev: The nfc device whose parent is being set + * @dev: The parent device + */ +static inline void nfc_set_parent_dev(struct nfc_dev *nfc_dev, + struct device *dev) +{ + nfc_dev->dev.parent = dev; +} + +/** + * nfc_set_drvdata - set driver specifc data + * + * @dev: The nfc device + * @data: Pointer to driver specifc data + */ +static inline void nfc_set_drvdata(struct nfc_dev *dev, void *data) +{ + dev_set_drvdata(&dev->dev, data); +} + +/** + * nfc_get_drvdata - get driver specifc data + * + * @dev: The nfc device + */ +static inline void *nfc_get_drvdata(struct nfc_dev *dev) +{ + return dev_get_drvdata(&dev->dev); +} + +/** + * nfc_device_name - get the nfc device name + * + * @dev: The nfc device whose name to return + */ +static inline const char *nfc_device_name(struct nfc_dev *dev) +{ + return dev_name(&dev->dev); +} + +struct sk_buff *nfc_alloc_skb(unsigned int size, gfp_t gfp); + +#endif /* __NET_NFC_H */ diff --git a/net/Kconfig b/net/Kconfig index 878151c772c..a0731484423 100644 --- a/net/Kconfig +++ b/net/Kconfig @@ -322,6 +322,7 @@ source "net/rfkill/Kconfig" source "net/9p/Kconfig" source "net/caif/Kconfig" source "net/ceph/Kconfig" +source "net/nfc/Kconfig" endif # if NET diff --git a/net/Makefile b/net/Makefile index a51d9465e62..acdde4950de 100644 --- a/net/Makefile +++ b/net/Makefile @@ -68,3 +68,4 @@ obj-$(CONFIG_WIMAX) += wimax/ obj-$(CONFIG_DNS_RESOLVER) += dns_resolver/ obj-$(CONFIG_CEPH_LIB) += ceph/ obj-$(CONFIG_BATMAN_ADV) += batman-adv/ +obj-$(CONFIG_NFC) += nfc/ diff --git a/net/nfc/Kconfig b/net/nfc/Kconfig new file mode 100644 index 00000000000..33e095b124b --- /dev/null +++ b/net/nfc/Kconfig @@ -0,0 +1,16 @@ +# +# NFC sybsystem configuration +# + +menuconfig NFC + depends on NET && EXPERIMENTAL + tristate "NFC subsystem support (EXPERIMENTAL)" + default n + help + Say Y here if you want to build support for NFC (Near field + communication) devices. + + To compile this support as a module, choose M here: the module will + be called nfc. + +source "drivers/nfc/Kconfig" diff --git a/net/nfc/Makefile b/net/nfc/Makefile new file mode 100644 index 00000000000..28bee595868 --- /dev/null +++ b/net/nfc/Makefile @@ -0,0 +1,7 @@ +# +# Makefile for the Linux NFC subsystem. +# + +obj-$(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 00000000000..19f8035a1ba --- /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 00000000000..55f83f86fe2 --- /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 */ |