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/nfc.h>
 28#include <linux/device.h>
 29#include <linux/skbuff.h>
 30
 31#define nfc_dev_info(dev, fmt, arg...) dev_info((dev), "NFC: " fmt "\n", ## arg)
 32#define nfc_dev_err(dev, fmt, arg...) dev_err((dev), "NFC: " fmt "\n", ## arg)
 33#define nfc_dev_dbg(dev, fmt, arg...) dev_dbg((dev), fmt "\n", ## arg)
 34
 35struct nfc_dev;
 36
 37/**
 38 * data_exchange_cb_t - Definition of nfc_data_exchange callback
 39 *
 40 * @context: nfc_data_exchange cb_context parameter
 41 * @skb: response data
 42 * @err: If an error has occurred during data exchange, it is the
 43 *	error number. Zero means no error.
 44 *
 45 * When a rx or tx package is lost or corrupted or the target gets out
 46 * of the operating field, err is -EIO.
 47 */
 48typedef void (*data_exchange_cb_t)(void *context, struct sk_buff *skb,
 49								int err);
 50
 51struct nfc_target;
 52
 53struct nfc_ops {
 54	int (*dev_up)(struct nfc_dev *dev);
 55	int (*dev_down)(struct nfc_dev *dev);
 56	int (*start_poll)(struct nfc_dev *dev, u32 protocols);
 57	void (*stop_poll)(struct nfc_dev *dev);
 58	int (*dep_link_up)(struct nfc_dev *dev, struct nfc_target *target,
 59			   u8 comm_mode, u8 *gb, size_t gb_len);
 60	int (*dep_link_down)(struct nfc_dev *dev);
 61	int (*activate_target)(struct nfc_dev *dev, struct nfc_target *target,
 62			       u32 protocol);
 63	void (*deactivate_target)(struct nfc_dev *dev,
 64				  struct nfc_target *target);
 65	int (*data_exchange)(struct nfc_dev *dev, struct nfc_target *target,
 66			     struct sk_buff *skb, data_exchange_cb_t cb,
 67			     void *cb_context);
 68	int (*check_presence)(struct nfc_dev *dev, struct nfc_target *target);
 69};
 70
 71#define NFC_TARGET_IDX_ANY -1
 72#define NFC_MAX_GT_LEN 48
 73
 74struct nfc_target {
 75	u32 idx;
 76	u32 supported_protocols;
 77	u16 sens_res;
 78	u8 sel_res;
 79	u8 nfcid1_len;
 80	u8 nfcid1[NFC_NFCID1_MAXSIZE];
 81	u8 sensb_res_len;
 82	u8 sensb_res[NFC_SENSB_RES_MAXSIZE];
 83	u8 sensf_res_len;
 84	u8 sensf_res[NFC_SENSF_RES_MAXSIZE];
 85	u8 hci_reader_gate;
 86	u8 logical_idx;
 87};
 88
 89struct nfc_genl_data {
 90	u32 poll_req_pid;
 91	struct mutex genl_data_mutex;
 92};
 93
 94struct nfc_dev {
 95	unsigned int idx;
 96	u32 target_next_idx;
 97	struct nfc_target *targets;
 98	int n_targets;
 99	int targets_generation;
100	struct device dev;
101	bool dev_up;
102	bool polling;
103	struct nfc_target *active_target;
104	bool dep_link_up;
105	u32 dep_rf_mode;
106	struct nfc_genl_data genl_data;
107	u32 supported_protocols;
108
109	int tx_headroom;
110	int tx_tailroom;
111
112	struct timer_list check_pres_timer;
113	struct workqueue_struct *check_pres_wq;
114	struct work_struct check_pres_work;
115
116	struct nfc_ops *ops;
117};
118#define to_nfc_dev(_dev) container_of(_dev, struct nfc_dev, dev)
119
120extern struct class nfc_class;
121
122struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
123				    u32 supported_protocols,
124				    int tx_headroom,
125				    int tx_tailroom);
126
127/**
128 * nfc_free_device - free nfc device
129 *
130 * @dev: The nfc device to free
131 */
132static inline void nfc_free_device(struct nfc_dev *dev)
133{
134	put_device(&dev->dev);
135}
136
137int nfc_register_device(struct nfc_dev *dev);
138
139void nfc_unregister_device(struct nfc_dev *dev);
140
141/**
142 * nfc_set_parent_dev - set the parent device
143 *
144 * @nfc_dev: The nfc device whose parent is being set
145 * @dev: The parent device
146 */
147static inline void nfc_set_parent_dev(struct nfc_dev *nfc_dev,
148				      struct device *dev)
149{
150	nfc_dev->dev.parent = dev;
151}
152
153/**
154 * nfc_set_drvdata - set driver specifc data
155 *
156 * @dev: The nfc device
157 * @data: Pointer to driver specifc data
158 */
159static inline void nfc_set_drvdata(struct nfc_dev *dev, void *data)
160{
161	dev_set_drvdata(&dev->dev, data);
162}
163
164/**
165 * nfc_get_drvdata - get driver specifc data
166 *
167 * @dev: The nfc device
168 */
169static inline void *nfc_get_drvdata(struct nfc_dev *dev)
170{
171	return dev_get_drvdata(&dev->dev);
172}
173
174/**
175 * nfc_device_name - get the nfc device name
176 *
177 * @dev: The nfc device whose name to return
178 */
179static inline const char *nfc_device_name(struct nfc_dev *dev)
180{
181	return dev_name(&dev->dev);
182}
183
184struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk,
185				   unsigned int flags, unsigned int size,
186				   unsigned int *err);
187struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp);
188
189int nfc_set_remote_general_bytes(struct nfc_dev *dev,
190				 u8 *gt, u8 gt_len);
191
192int nfc_targets_found(struct nfc_dev *dev,
193		      struct nfc_target *targets, int ntargets);
194int nfc_target_lost(struct nfc_dev *dev, u32 target_idx);
195
196int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx,
197		       u8 comm_mode, u8 rf_mode);
198
199#endif /* __NET_NFC_H */