diff options
Diffstat (limited to 'include/net/nfc/nfc.h')
| -rw-r--r-- | include/net/nfc/nfc.h | 352 |
1 files changed, 352 insertions, 0 deletions
diff --git a/include/net/nfc/nfc.h b/include/net/nfc/nfc.h new file mode 100644 index 000000000..32890e43f --- /dev/null +++ b/include/net/nfc/nfc.h @@ -0,0 +1,352 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2011 Instituto Nokia de Tecnologia + * Copyright (C) 2014 Marvell International Ltd. + * + * Authors: + * Lauro Ramos Venancio <lauro.venancio@openbossa.org> + * Aloisio Almeida Jr <aloisio.almeida@openbossa.org> + */ + +#ifndef __NET_NFC_H +#define __NET_NFC_H + +#include <linux/nfc.h> +#include <linux/device.h> +#include <linux/skbuff.h> + +#define nfc_dbg(dev, fmt, ...) dev_dbg((dev), "NFC: " fmt, ##__VA_ARGS__) +#define nfc_info(dev, fmt, ...) dev_info((dev), "NFC: " fmt, ##__VA_ARGS__) +#define nfc_err(dev, fmt, ...) dev_err((dev), "NFC: " fmt, ##__VA_ARGS__) + +struct nfc_phy_ops { + int (*write)(void *dev_id, struct sk_buff *skb); + int (*enable)(void *dev_id); + void (*disable)(void *dev_id); +}; + +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); + +typedef void (*se_io_cb_t)(void *context, u8 *apdu, size_t apdu_len, int err); + +struct nfc_target; + +struct nfc_ops { + int (*dev_up)(struct nfc_dev *dev); + int (*dev_down)(struct nfc_dev *dev); + int (*start_poll)(struct nfc_dev *dev, + u32 im_protocols, u32 tm_protocols); + void (*stop_poll)(struct nfc_dev *dev); + int (*dep_link_up)(struct nfc_dev *dev, struct nfc_target *target, + u8 comm_mode, u8 *gb, size_t gb_len); + int (*dep_link_down)(struct nfc_dev *dev); + int (*activate_target)(struct nfc_dev *dev, struct nfc_target *target, + u32 protocol); + void (*deactivate_target)(struct nfc_dev *dev, + struct nfc_target *target, u8 mode); + int (*im_transceive)(struct nfc_dev *dev, struct nfc_target *target, + struct sk_buff *skb, data_exchange_cb_t cb, + void *cb_context); + int (*tm_send)(struct nfc_dev *dev, struct sk_buff *skb); + int (*check_presence)(struct nfc_dev *dev, struct nfc_target *target); + int (*fw_download)(struct nfc_dev *dev, const char *firmware_name); + + /* Secure Element API */ + int (*discover_se)(struct nfc_dev *dev); + int (*enable_se)(struct nfc_dev *dev, u32 se_idx); + int (*disable_se)(struct nfc_dev *dev, u32 se_idx); + int (*se_io) (struct nfc_dev *dev, u32 se_idx, + u8 *apdu, size_t apdu_length, + se_io_cb_t cb, void *cb_context); +}; + +#define NFC_TARGET_IDX_ANY -1 +#define NFC_MAX_GT_LEN 48 +#define NFC_ATR_RES_GT_OFFSET 15 +#define NFC_ATR_REQ_GT_OFFSET 14 + +/** + * struct nfc_target - NFC target descriptiom + * + * @sens_res: 2 bytes describing the target SENS_RES response, if the target + * is a type A one. The %sens_res most significant byte must be byte 2 + * as described by the NFC Forum digital specification (i.e. the platform + * configuration one) while %sens_res least significant byte is byte 1. + */ +struct nfc_target { + u32 idx; + u32 supported_protocols; + u16 sens_res; + u8 sel_res; + u8 nfcid1_len; + u8 nfcid1[NFC_NFCID1_MAXSIZE]; + u8 nfcid2_len; + u8 nfcid2[NFC_NFCID2_MAXSIZE]; + u8 sensb_res_len; + u8 sensb_res[NFC_SENSB_RES_MAXSIZE]; + u8 sensf_res_len; + u8 sensf_res[NFC_SENSF_RES_MAXSIZE]; + u8 hci_reader_gate; + u8 logical_idx; + u8 is_iso15693; + u8 iso15693_dsfid; + u8 iso15693_uid[NFC_ISO15693_UID_MAXSIZE]; +}; + +/** + * nfc_se - A structure for NFC accessible secure elements. + * + * @idx: The secure element index. User space will enable or + * disable a secure element by its index. + * @type: The secure element type. It can be SE_UICC or + * SE_EMBEDDED. + * @state: The secure element state, either enabled or disabled. + * + */ +struct nfc_se { + struct list_head list; + u32 idx; + u16 type; + u16 state; +}; + +/** + * nfc_evt_transaction - A struct for NFC secure element event transaction. + * + * @aid: The application identifier triggering the event + * + * @aid_len: The application identifier length [5:16] + * + * @params: The application parameters transmitted during the transaction + * + * @params_len: The applications parameters length [0:255] + * + */ +#define NFC_MIN_AID_LENGTH 5 +#define NFC_MAX_AID_LENGTH 16 +#define NFC_MAX_PARAMS_LENGTH 255 + +#define NFC_EVT_TRANSACTION_AID_TAG 0x81 +#define NFC_EVT_TRANSACTION_PARAMS_TAG 0x82 +struct nfc_evt_transaction { + u32 aid_len; + u8 aid[NFC_MAX_AID_LENGTH]; + u8 params_len; + u8 params[]; +} __packed; + +struct nfc_genl_data { + u32 poll_req_portid; + struct mutex genl_data_mutex; +}; + +struct nfc_vendor_cmd { + __u32 vendor_id; + __u32 subcmd; + int (*doit)(struct nfc_dev *dev, void *data, size_t data_len); +}; + +struct nfc_dev { + int idx; + u32 target_next_idx; + struct nfc_target *targets; + int n_targets; + int targets_generation; + struct device dev; + bool dev_up; + bool fw_download_in_progress; + u8 rf_mode; + bool polling; + struct nfc_target *active_target; + bool dep_link_up; + struct nfc_genl_data genl_data; + u32 supported_protocols; + + struct list_head secure_elements; + + int tx_headroom; + int tx_tailroom; + + struct timer_list check_pres_timer; + struct work_struct check_pres_work; + + bool shutting_down; + + struct rfkill *rfkill; + + struct nfc_vendor_cmd *vendor_cmds; + int n_vendor_cmds; + + struct nfc_ops *ops; + struct genl_info *cur_cmd_info; +}; +#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, + int tx_headroom, + int tx_tailroom); + +/** + * 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_send_skb(struct nfc_dev *dev, struct sock *sk, + unsigned int flags, unsigned int size, + unsigned int *err); +struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp); + +int nfc_set_remote_general_bytes(struct nfc_dev *dev, + const u8 *gt, u8 gt_len); +u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len); + +int nfc_fw_download_done(struct nfc_dev *dev, const char *firmware_name, + u32 result); + +int nfc_targets_found(struct nfc_dev *dev, + struct nfc_target *targets, int ntargets); +int nfc_target_lost(struct nfc_dev *dev, u32 target_idx); + +int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx, + u8 comm_mode, u8 rf_mode); + +int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode, + const u8 *gb, size_t gb_len); +int nfc_tm_deactivated(struct nfc_dev *dev); +int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb); + +void nfc_driver_failure(struct nfc_dev *dev, int err); + +int nfc_se_transaction(struct nfc_dev *dev, u8 se_idx, + struct nfc_evt_transaction *evt_transaction); +int nfc_se_connectivity(struct nfc_dev *dev, u8 se_idx); +int nfc_add_se(struct nfc_dev *dev, u32 se_idx, u16 type); +int nfc_remove_se(struct nfc_dev *dev, u32 se_idx); +struct nfc_se *nfc_find_se(struct nfc_dev *dev, u32 se_idx); + +void nfc_send_to_raw_sock(struct nfc_dev *dev, struct sk_buff *skb, + u8 payload_type, u8 direction); + +static inline int nfc_set_vendor_cmds(struct nfc_dev *dev, + struct nfc_vendor_cmd *cmds, + int n_cmds) +{ + if (dev->vendor_cmds || dev->n_vendor_cmds) + return -EINVAL; + + dev->vendor_cmds = cmds; + dev->n_vendor_cmds = n_cmds; + + return 0; +} + +struct sk_buff *__nfc_alloc_vendor_cmd_reply_skb(struct nfc_dev *dev, + enum nfc_attrs attr, + u32 oui, u32 subcmd, + int approxlen); +int nfc_vendor_cmd_reply(struct sk_buff *skb); + +/** + * nfc_vendor_cmd_alloc_reply_skb - allocate vendor command reply + * @dev: nfc device + * @oui: vendor oui + * @approxlen: an upper bound of the length of the data that will + * be put into the skb + * + * This function allocates and pre-fills an skb for a reply to + * a vendor command. Since it is intended for a reply, calling + * it outside of a vendor command's doit() operation is invalid. + * + * The returned skb is pre-filled with some identifying data in + * a way that any data that is put into the skb (with skb_put(), + * nla_put() or similar) will end up being within the + * %NFC_ATTR_VENDOR_DATA attribute, so all that needs to be done + * with the skb is adding data for the corresponding userspace tool + * which can then read that data out of the vendor data attribute. + * You must not modify the skb in any other way. + * + * When done, call nfc_vendor_cmd_reply() with the skb and return + * its error code as the result of the doit() operation. + * + * Return: An allocated and pre-filled skb. %NULL if any errors happen. + */ +static inline struct sk_buff * +nfc_vendor_cmd_alloc_reply_skb(struct nfc_dev *dev, + u32 oui, u32 subcmd, int approxlen) +{ + return __nfc_alloc_vendor_cmd_reply_skb(dev, + NFC_ATTR_VENDOR_DATA, + oui, + subcmd, approxlen); +} + +#endif /* __NET_NFC_H */ |