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 (*activate_target)(struct nfc_dev *dev, u32 target_idx, 56 u32 protocol); 57 void (*deactivate_target)(struct nfc_dev *dev, u32 target_idx); 58 int (*data_exchange)(struct nfc_dev *dev, u32 target_idx, 59 struct sk_buff *skb, data_exchange_cb_t cb, 60 void *cb_context); 61 }; 62 63 struct nfc_target { 64 u32 idx; 65 u32 supported_protocols; 66 u16 sens_res; 67 u8 sel_res; 68 }; 69 70 struct nfc_genl_data { 71 u32 poll_req_pid; 72 struct mutex genl_data_mutex; 73 }; 74 75 struct nfc_dev { 76 unsigned idx; 77 unsigned target_idx; 78 struct nfc_target *targets; 79 int n_targets; 80 int targets_generation; 81 spinlock_t targets_lock; 82 struct device dev; 83 bool dev_up; 84 bool polling; 85 bool remote_activated; 86 struct nfc_genl_data genl_data; 87 u32 supported_protocols; 88 89 int tx_headroom; 90 int tx_tailroom; 91 92 struct nfc_ops *ops; 93 }; 94 #define to_nfc_dev(_dev) container_of(_dev, struct nfc_dev, dev) 95 96 extern struct class nfc_class; 97 98 struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops, 99 u32 supported_protocols, 100 int tx_headroom, 101 int tx_tailroom); 102 103 /** 104 * nfc_free_device - free nfc device 105 * 106 * @dev: The nfc device to free 107 */ 108 static inline void nfc_free_device(struct nfc_dev *dev) 109 { 110 put_device(&dev->dev); 111 } 112 113 int nfc_register_device(struct nfc_dev *dev); 114 115 void nfc_unregister_device(struct nfc_dev *dev); 116 117 /** 118 * nfc_set_parent_dev - set the parent device 119 * 120 * @nfc_dev: The nfc device whose parent is being set 121 * @dev: The parent device 122 */ 123 static inline void nfc_set_parent_dev(struct nfc_dev *nfc_dev, 124 struct device *dev) 125 { 126 nfc_dev->dev.parent = dev; 127 } 128 129 /** 130 * nfc_set_drvdata - set driver specifc data 131 * 132 * @dev: The nfc device 133 * @data: Pointer to driver specifc data 134 */ 135 static inline void nfc_set_drvdata(struct nfc_dev *dev, void *data) 136 { 137 dev_set_drvdata(&dev->dev, data); 138 } 139 140 /** 141 * nfc_get_drvdata - get driver specifc data 142 * 143 * @dev: The nfc device 144 */ 145 static inline void *nfc_get_drvdata(struct nfc_dev *dev) 146 { 147 return dev_get_drvdata(&dev->dev); 148 } 149 150 /** 151 * nfc_device_name - get the nfc device name 152 * 153 * @dev: The nfc device whose name to return 154 */ 155 static inline const char *nfc_device_name(struct nfc_dev *dev) 156 { 157 return dev_name(&dev->dev); 158 } 159 160 struct sk_buff *nfc_alloc_skb(unsigned int size, gfp_t gfp); 161 162 int nfc_targets_found(struct nfc_dev *dev, struct nfc_target *targets, 163 int ntargets); 164 165 #endif /* __NET_NFC_H */ 166