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 34 struct 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 */ 47 typedef void (*data_exchange_cb_t)(void *context, struct sk_buff *skb, 48 int err); 49 50 struct nfc_ops { 51 int (*dev_up)(struct nfc_dev *dev); 52 int (*dev_down)(struct nfc_dev *dev); 53 int (*start_poll)(struct nfc_dev *dev, u32 protocols); 54 void (*stop_poll)(struct nfc_dev *dev); 55 int (*dep_link_up)(struct nfc_dev *dev, int target_idx, 56 u8 comm_mode, u8 rf_mode); 57 int (*dep_link_down)(struct nfc_dev *dev); 58 int (*activate_target)(struct nfc_dev *dev, u32 target_idx, 59 u32 protocol); 60 void (*deactivate_target)(struct nfc_dev *dev, u32 target_idx); 61 int (*data_exchange)(struct nfc_dev *dev, u32 target_idx, 62 struct sk_buff *skb, data_exchange_cb_t cb, 63 void *cb_context); 64 }; 65 66 #define NFC_TARGET_IDX_ANY -1 67 #define NFC_MAX_GT_LEN 48 68 69 struct nfc_target { 70 u32 idx; 71 u32 supported_protocols; 72 u16 sens_res; 73 u8 sel_res; 74 }; 75 76 struct nfc_genl_data { 77 u32 poll_req_pid; 78 struct mutex genl_data_mutex; 79 }; 80 81 struct nfc_dev { 82 unsigned idx; 83 unsigned target_idx; 84 struct nfc_target *targets; 85 int n_targets; 86 int targets_generation; 87 spinlock_t targets_lock; 88 struct device dev; 89 bool dev_up; 90 bool polling; 91 bool remote_activated; 92 bool dep_link_up; 93 u32 dep_rf_mode; 94 struct nfc_genl_data genl_data; 95 u32 supported_protocols; 96 97 int tx_headroom; 98 int tx_tailroom; 99 100 struct nfc_ops *ops; 101 }; 102 #define to_nfc_dev(_dev) container_of(_dev, struct nfc_dev, dev) 103 104 extern struct class nfc_class; 105 106 struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops, 107 u32 supported_protocols, 108 int tx_headroom, 109 int tx_tailroom); 110 111 /** 112 * nfc_free_device - free nfc device 113 * 114 * @dev: The nfc device to free 115 */ 116 static inline void nfc_free_device(struct nfc_dev *dev) 117 { 118 put_device(&dev->dev); 119 } 120 121 int nfc_register_device(struct nfc_dev *dev); 122 123 void nfc_unregister_device(struct nfc_dev *dev); 124 125 /** 126 * nfc_set_parent_dev - set the parent device 127 * 128 * @nfc_dev: The nfc device whose parent is being set 129 * @dev: The parent device 130 */ 131 static inline void nfc_set_parent_dev(struct nfc_dev *nfc_dev, 132 struct device *dev) 133 { 134 nfc_dev->dev.parent = dev; 135 } 136 137 /** 138 * nfc_set_drvdata - set driver specifc data 139 * 140 * @dev: The nfc device 141 * @data: Pointer to driver specifc data 142 */ 143 static inline void nfc_set_drvdata(struct nfc_dev *dev, void *data) 144 { 145 dev_set_drvdata(&dev->dev, data); 146 } 147 148 /** 149 * nfc_get_drvdata - get driver specifc data 150 * 151 * @dev: The nfc device 152 */ 153 static inline void *nfc_get_drvdata(struct nfc_dev *dev) 154 { 155 return dev_get_drvdata(&dev->dev); 156 } 157 158 /** 159 * nfc_device_name - get the nfc device name 160 * 161 * @dev: The nfc device whose name to return 162 */ 163 static inline const char *nfc_device_name(struct nfc_dev *dev) 164 { 165 return dev_name(&dev->dev); 166 } 167 168 struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk, 169 unsigned int flags, unsigned int size, 170 unsigned int *err); 171 struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp); 172 173 int nfc_set_remote_general_bytes(struct nfc_dev *dev, 174 u8 *gt, u8 gt_len); 175 176 u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, u8 *gt_len); 177 178 int nfc_targets_found(struct nfc_dev *dev, struct nfc_target *targets, 179 int ntargets); 180 181 int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx, 182 u8 comm_mode, u8 rf_mode); 183 184 #endif /* __NET_NFC_H */ 185