/*
 * Copyright (C) 2011  Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

#ifndef __NET_HCI_H
#define __NET_HCI_H

#include <linux/skbuff.h>

#include <net/nfc/nfc.h>

struct nfc_hci_dev;

struct nfc_hci_ops {
	int (*open) (struct nfc_hci_dev *hdev);
	void (*close) (struct nfc_hci_dev *hdev);
	int (*load_session) (struct nfc_hci_dev *hdev);
	int (*hci_ready) (struct nfc_hci_dev *hdev);
	/*
	 * xmit must always send the complete buffer before
	 * returning. Returned result must be 0 for success
	 * or negative for failure.
	 */
	int (*xmit) (struct nfc_hci_dev *hdev, struct sk_buff *skb);
	int (*start_poll) (struct nfc_hci_dev *hdev,
			   u32 im_protocols, u32 tm_protocols);
	void (*stop_poll) (struct nfc_hci_dev *hdev);
	int (*dep_link_up)(struct nfc_hci_dev *hdev, struct nfc_target *target,
			   u8 comm_mode, u8 *gb, size_t gb_len);
	int (*dep_link_down)(struct nfc_hci_dev *hdev);
	int (*target_from_gate) (struct nfc_hci_dev *hdev, u8 gate,
				 struct nfc_target *target);
	int (*complete_target_discovered) (struct nfc_hci_dev *hdev, u8 gate,
					   struct nfc_target *target);
	int (*im_transceive) (struct nfc_hci_dev *hdev,
			      struct nfc_target *target, struct sk_buff *skb,
			      data_exchange_cb_t cb, void *cb_context);
	int (*tm_send)(struct nfc_hci_dev *hdev, struct sk_buff *skb);
	int (*check_presence)(struct nfc_hci_dev *hdev,
			      struct nfc_target *target);
	int (*event_received)(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
			      struct sk_buff *skb);
	void (*cmd_received)(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
			    struct sk_buff *skb);
	int (*fw_download)(struct nfc_hci_dev *hdev, const char *firmware_name);
	int (*discover_se)(struct nfc_hci_dev *dev);
	int (*enable_se)(struct nfc_hci_dev *dev, u32 se_idx);
	int (*disable_se)(struct nfc_hci_dev *dev, u32 se_idx);
	int (*se_io)(struct nfc_hci_dev *dev, u32 se_idx,
		      u8 *apdu, size_t apdu_length,
		      se_io_cb_t cb, void *cb_context);
};

/* Pipes */
#define NFC_HCI_DO_NOT_CREATE_PIPE	0x81
#define NFC_HCI_INVALID_PIPE	0x80
#define NFC_HCI_INVALID_GATE	0xFF
#define NFC_HCI_INVALID_HOST	0x80
#define NFC_HCI_LINK_MGMT_PIPE	0x00
#define NFC_HCI_ADMIN_PIPE	0x01

struct nfc_hci_gate {
	u8 gate;
	u8 pipe;
};

struct nfc_hci_pipe {
	u8 gate;
	u8 dest_host;
};

#define NFC_HCI_MAX_CUSTOM_GATES	50
/*
 * According to specification 102 622 chapter 4.4 Pipes,
 * the pipe identifier is 7 bits long.
 */
#define NFC_HCI_MAX_PIPES		128
struct nfc_hci_init_data {
	u8 gate_count;
	struct nfc_hci_gate gates[NFC_HCI_MAX_CUSTOM_GATES];
	char session_id[9];
};

typedef int (*xmit) (struct sk_buff *skb, void *cb_data);

#define NFC_HCI_MAX_GATES		256

/*
 * These values can be specified by a driver to indicate it requires some
 * adaptation of the HCI standard.
 *
 * NFC_HCI_QUIRK_SHORT_CLEAR - send HCI_ADM_CLEAR_ALL_PIPE cmd with no params
 */
enum {
	NFC_HCI_QUIRK_SHORT_CLEAR	= 0,
};

struct nfc_hci_dev {
	struct nfc_dev *ndev;

	u32 max_data_link_payload;

	bool shutting_down;

	struct mutex msg_tx_mutex;

	struct list_head msg_tx_queue;

	struct work_struct msg_tx_work;

	struct timer_list cmd_timer;
	struct hci_msg *cmd_pending_msg;

	struct sk_buff_head rx_hcp_frags;

	struct work_struct msg_rx_work;

	struct sk_buff_head msg_rx_queue;

	struct nfc_hci_ops *ops;

	struct nfc_llc *llc;

	struct nfc_hci_init_data init_data;

	void *clientdata;

	u8 gate2pipe[NFC_HCI_MAX_GATES];
	struct nfc_hci_pipe pipes[NFC_HCI_MAX_PIPES];

	u8 sw_romlib;
	u8 sw_patch;
	u8 sw_flashlib_major;
	u8 sw_flashlib_minor;

	u8 hw_derivative;
	u8 hw_version;
	u8 hw_mpw;
	u8 hw_software;
	u8 hw_bsid;

	int async_cb_type;
	data_exchange_cb_t async_cb;
	void *async_cb_context;

	u8 *gb;
	size_t gb_len;

	unsigned long quirks;
};

/* hci device allocation */
struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
					    struct nfc_hci_init_data *init_data,
					    unsigned long quirks,
					    u32 protocols,
					    const char *llc_name,
					    int tx_headroom,
					    int tx_tailroom,
					    int max_link_payload);
void nfc_hci_free_device(struct nfc_hci_dev *hdev);

int nfc_hci_register_device(struct nfc_hci_dev *hdev);
void nfc_hci_unregister_device(struct nfc_hci_dev *hdev);

void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata);
void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev);

static inline int nfc_hci_set_vendor_cmds(struct nfc_hci_dev *hdev,
					  struct nfc_vendor_cmd *cmds,
					  int n_cmds)
{
	return nfc_set_vendor_cmds(hdev->ndev, cmds, n_cmds);
}

void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err);

int nfc_hci_result_to_errno(u8 result);
void nfc_hci_reset_pipes(struct nfc_hci_dev *dev);
void nfc_hci_reset_pipes_per_host(struct nfc_hci_dev *hdev, u8 host);

/* Host IDs */
#define NFC_HCI_HOST_CONTROLLER_ID	0x00
#define NFC_HCI_TERMINAL_HOST_ID	0x01
#define NFC_HCI_UICC_HOST_ID		0x02

/* Host Controller Gates and registry indexes */
#define NFC_HCI_ADMIN_GATE 0x00
#define NFC_HCI_ADMIN_SESSION_IDENTITY	0x01
#define NFC_HCI_ADMIN_MAX_PIPE		0x02
#define NFC_HCI_ADMIN_WHITELIST		0x03
#define NFC_HCI_ADMIN_HOST_LIST		0x04

#define NFC_HCI_LOOPBACK_GATE		0x04

#define NFC_HCI_ID_MGMT_GATE		0x05
#define NFC_HCI_ID_MGMT_VERSION_SW	0x01
#define NFC_HCI_ID_MGMT_VERSION_HW	0x03
#define NFC_HCI_ID_MGMT_VENDOR_NAME	0x04
#define NFC_HCI_ID_MGMT_MODEL_ID	0x05
#define NFC_HCI_ID_MGMT_HCI_VERSION	0x02
#define NFC_HCI_ID_MGMT_GATES_LIST	0x06

#define NFC_HCI_LINK_MGMT_GATE		0x06
#define NFC_HCI_LINK_MGMT_REC_ERROR	0x01

#define NFC_HCI_RF_READER_B_GATE			0x11
#define NFC_HCI_RF_READER_B_PUPI			0x03
#define NFC_HCI_RF_READER_B_APPLICATION_DATA		0x04
#define NFC_HCI_RF_READER_B_AFI				0x02
#define NFC_HCI_RF_READER_B_HIGHER_LAYER_RESPONSE	0x01
#define NFC_HCI_RF_READER_B_HIGHER_LAYER_DATA		0x05

#define NFC_HCI_RF_READER_A_GATE		0x13
#define NFC_HCI_RF_READER_A_UID			0x02
#define NFC_HCI_RF_READER_A_ATQA		0x04
#define NFC_HCI_RF_READER_A_APPLICATION_DATA	0x05
#define NFC_HCI_RF_READER_A_SAK			0x03
#define NFC_HCI_RF_READER_A_FWI_SFGT		0x06
#define NFC_HCI_RF_READER_A_DATARATE_MAX	0x01

#define NFC_HCI_TYPE_A_SEL_PROT(x)		(((x) & 0x60) >> 5)
#define NFC_HCI_TYPE_A_SEL_PROT_MIFARE		0
#define NFC_HCI_TYPE_A_SEL_PROT_ISO14443	1
#define NFC_HCI_TYPE_A_SEL_PROT_DEP		2
#define NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP	3

/* Generic events */
#define NFC_HCI_EVT_HCI_END_OF_OPERATION	0x01
#define NFC_HCI_EVT_POST_DATA			0x02
#define NFC_HCI_EVT_HOT_PLUG			0x03

/* Generic commands */
#define NFC_HCI_ANY_SET_PARAMETER	0x01
#define NFC_HCI_ANY_GET_PARAMETER	0x02
#define NFC_HCI_ANY_OPEN_PIPE		0x03
#define NFC_HCI_ANY_CLOSE_PIPE		0x04

/* Reader RF gates events */
#define NFC_HCI_EVT_READER_REQUESTED	0x10
#define NFC_HCI_EVT_END_OPERATION	0x11

/* Reader Application gate events */
#define NFC_HCI_EVT_TARGET_DISCOVERED	0x10

/* receiving messages from lower layer */
void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result,
			   struct sk_buff *skb);
void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
			  struct sk_buff *skb);
void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
			    struct sk_buff *skb);
void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb);

/* connecting to gates and sending hci instructions */
int nfc_hci_connect_gate(struct nfc_hci_dev *hdev, u8 dest_host, u8 dest_gate,
			 u8 pipe);
int nfc_hci_disconnect_gate(struct nfc_hci_dev *hdev, u8 gate);
int nfc_hci_disconnect_all_gates(struct nfc_hci_dev *hdev);
int nfc_hci_get_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx,
		      struct sk_buff **skb);
int nfc_hci_set_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx,
		      const u8 *param, size_t param_len);
int nfc_hci_send_cmd(struct nfc_hci_dev *hdev, u8 gate, u8 cmd,
		     const u8 *param, size_t param_len, struct sk_buff **skb);
int nfc_hci_send_cmd_async(struct nfc_hci_dev *hdev, u8 gate, u8 cmd,
			   const u8 *param, size_t param_len,
			   data_exchange_cb_t cb, void *cb_context);
int nfc_hci_send_event(struct nfc_hci_dev *hdev, u8 gate, u8 event,
		       const u8 *param, size_t param_len);
int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate);
u32 nfc_hci_sak_to_protocol(u8 sak);

#endif /* __NET_HCI_H */
