1/*
  2 * Copyright (C) 2011 Instituto Nokia de Tecnologia
  3 *
  4 * Authors:
  5 *    Lauro Ramos Venancio <lauro.venancio@openbossa.org>
  6 *    Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
  7 *
  8 * This program is free software; you can redistribute it and/or modify
  9 * it under the terms of the GNU General Public License as published by
 10 * the Free Software Foundation; either version 2 of the License, or
 11 * (at your option) any later version.
 12 *
 13 * This program is distributed in the hope that it will be useful,
 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 16 * GNU General Public License for more details.
 17 *
 18 * You should have received a copy of the GNU General Public License
 19 * along with this program; if not, write to the
 20 * Free Software Foundation, Inc.,
 21 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 22 */
 23
 24#ifndef __NET_NFC_H
 25#define __NET_NFC_H
 26
 27#include <linux/device.h>
 28#include <linux/skbuff.h>
 29
 30#define nfc_dev_info(dev, fmt, arg...) dev_info((dev), "NFC: " fmt "\n", ## arg)
 31#define nfc_dev_err(dev, fmt, arg...) dev_err((dev), "NFC: " fmt "\n", ## arg)
 32#define nfc_dev_dbg(dev, fmt, arg...) dev_dbg((dev), fmt "\n", ## arg)
 33
 34struct nfc_dev;
 35
 36/**
 37 * data_exchange_cb_t - Definition of nfc_data_exchange callback
 38 *
 39 * @context: nfc_data_exchange cb_context parameter
 40 * @skb: response data
 41 * @err: If an error has occurred during data exchange, it is the
 42 *	error number. Zero means no error.
 43 *
 44 * When a rx or tx package is lost or corrupted or the target gets out
 45 * of the operating field, err is -EIO.
 46 */
 47typedef void (*data_exchange_cb_t)(void *context, struct sk_buff *skb,
 48								int err);
 49
 50struct nfc_ops {
 51	int (*start_poll)(struct nfc_dev *dev, u32 protocols);
 52	void (*stop_poll)(struct nfc_dev *dev);
 53	int (*activate_target)(struct nfc_dev *dev, u32 target_idx,
 54							u32 protocol);
 55	void (*deactivate_target)(struct nfc_dev *dev, u32 target_idx);
 56	int (*data_exchange)(struct nfc_dev *dev, u32 target_idx,
 57				struct sk_buff *skb, data_exchange_cb_t cb,
 58							void *cb_context);
 59};
 60
 61struct nfc_target {
 62	u32 idx;
 63	u32 supported_protocols;
 64	u16 sens_res;
 65	u8 sel_res;
 66};
 67
 68struct nfc_genl_data {
 69	u32 poll_req_pid;
 70	struct mutex genl_data_mutex;
 71};
 72
 73struct nfc_dev {
 74	unsigned idx;
 75	unsigned target_idx;
 76	struct nfc_target *targets;
 77	int n_targets;
 78	int targets_generation;
 79	spinlock_t targets_lock;
 80	struct device dev;
 81	bool polling;
 82	struct nfc_genl_data genl_data;
 83	u32 supported_protocols;
 84
 85	struct nfc_ops *ops;
 86};
 87#define to_nfc_dev(_dev) container_of(_dev, struct nfc_dev, dev)
 88
 89extern struct class nfc_class;
 90
 91struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
 92					u32 supported_protocols);
 93
 94/**
 95 * nfc_free_device - free nfc device
 96 *
 97 * @dev: The nfc device to free
 98 */
 99static inline void nfc_free_device(struct nfc_dev *dev)
100{
101	put_device(&dev->dev);
102}
103
104int nfc_register_device(struct nfc_dev *dev);
105
106void nfc_unregister_device(struct nfc_dev *dev);
107
108/**
109 * nfc_set_parent_dev - set the parent device
110 *
111 * @nfc_dev: The nfc device whose parent is being set
112 * @dev: The parent device
113 */
114static inline void nfc_set_parent_dev(struct nfc_dev *nfc_dev,
115					struct device *dev)
116{
117	nfc_dev->dev.parent = dev;
118}
119
120/**
121 * nfc_set_drvdata - set driver specifc data
122 *
123 * @dev: The nfc device
124 * @data: Pointer to driver specifc data
125 */
126static inline void nfc_set_drvdata(struct nfc_dev *dev, void *data)
127{
128	dev_set_drvdata(&dev->dev, data);
129}
130
131/**
132 * nfc_get_drvdata - get driver specifc data
133 *
134 * @dev: The nfc device
135 */
136static inline void *nfc_get_drvdata(struct nfc_dev *dev)
137{
138	return dev_get_drvdata(&dev->dev);
139}
140
141/**
142 * nfc_device_name - get the nfc device name
143 *
144 * @dev: The nfc device whose name to return
145 */
146static inline const char *nfc_device_name(struct nfc_dev *dev)
147{
148	return dev_name(&dev->dev);
149}
150
151struct sk_buff *nfc_alloc_skb(unsigned int size, gfp_t gfp);
152
153int nfc_targets_found(struct nfc_dev *dev, struct nfc_target *targets,
154							int ntargets);
155
156#endif /* __NET_NFC_H */