// SPDX-License-Identifier: GPL-2.0-only

  /*
   * Sony NFC Port-100 Series driver
   * Copyright (c) 2013, Intel Corporation.
   *
   * Partly based/Inspired by Stephen Tiedemann's nfcpy

   */
  
  #include <linux/module.h>
  #include <linux/usb.h>
  #include <net/nfc/digital.h>
  
  #define VERSION "0.1"

  #define SONY_VENDOR_ID		0x054c
  #define RCS380S_PRODUCT_ID	0x06c1
  #define RCS380P_PRODUCT_ID	0x06c3

  
  #define PORT100_PROTOCOLS (NFC_PROTO_JEWEL_MASK    | \
  			   NFC_PROTO_MIFARE_MASK   | \
  			   NFC_PROTO_FELICA_MASK   | \

  			   NFC_PROTO_NFC_DEP_MASK  | \

  			   NFC_PROTO_ISO14443_MASK | \
  			   NFC_PROTO_ISO14443_B_MASK)

  
  #define PORT100_CAPABILITIES (NFC_DIGITAL_DRV_CAPS_IN_CRC | \
  			      NFC_DIGITAL_DRV_CAPS_TG_CRC)

  /* Standard port100 frame definitions */
  #define PORT100_FRAME_HEADER_LEN (sizeof(struct port100_frame) \
  				  + 2) /* data[0] CC, data[1] SCC */
  #define PORT100_FRAME_TAIL_LEN 2 /* data[len] DCS, data[len + 1] postamble*/
  
  #define PORT100_COMM_RF_HEAD_MAX_LEN (sizeof(struct port100_tg_comm_rf_cmd))
  
  /*
   * Max extended frame payload len, excluding CC and SCC
   * which are already in PORT100_FRAME_HEADER_LEN.
   */
  #define PORT100_FRAME_MAX_PAYLOAD_LEN 1001
  
  #define PORT100_FRAME_ACK_SIZE 6 /* Preamble (1), SoPC (2), ACK Code (2),
  				    Postamble (1) */
  static u8 ack_frame[PORT100_FRAME_ACK_SIZE] = {
  	0x00, 0x00, 0xff, 0x00, 0xff, 0x00
  };
  
  #define PORT100_FRAME_CHECKSUM(f) (f->data[le16_to_cpu(f->datalen)])
  #define PORT100_FRAME_POSTAMBLE(f) (f->data[le16_to_cpu(f->datalen) + 1])
  
  /* start of frame */
  #define PORT100_FRAME_SOF	0x00FF
  #define PORT100_FRAME_EXT	0xFFFF
  #define PORT100_FRAME_ACK	0x00FF
  
  /* Port-100 command: in or out */
  #define PORT100_FRAME_DIRECTION(f) (f->data[0]) /* CC */
  #define PORT100_FRAME_DIR_OUT 0xD6
  #define PORT100_FRAME_DIR_IN  0xD7
  
  /* Port-100 sub-command */
  #define PORT100_FRAME_CMD(f) (f->data[1]) /* SCC */
  
  #define PORT100_CMD_GET_FIRMWARE_VERSION 0x20
  #define PORT100_CMD_GET_COMMAND_TYPE     0x28
  #define PORT100_CMD_SET_COMMAND_TYPE     0x2A

  #define PORT100_CMD_IN_SET_RF       0x00
  #define PORT100_CMD_IN_SET_PROTOCOL 0x02
  #define PORT100_CMD_IN_COMM_RF      0x04

  #define PORT100_CMD_TG_SET_RF       0x40
  #define PORT100_CMD_TG_SET_PROTOCOL 0x42
  #define PORT100_CMD_TG_SET_RF_OFF   0x46
  #define PORT100_CMD_TG_COMM_RF      0x48

  #define PORT100_CMD_SWITCH_RF       0x06

  #define PORT100_CMD_RESPONSE(cmd) (cmd + 1)
  
  #define PORT100_CMD_TYPE_IS_SUPPORTED(mask, cmd_type) \
  	((mask) & (0x01 << (cmd_type)))
  #define PORT100_CMD_TYPE_0	0
  #define PORT100_CMD_TYPE_1	1

  #define PORT100_CMD_STATUS_OK      0x00
  #define PORT100_CMD_STATUS_TIMEOUT 0x80

  #define PORT100_MDAA_TGT_HAS_BEEN_ACTIVATED_MASK 0x01
  #define PORT100_MDAA_TGT_WAS_ACTIVATED_MASK      0x02

  struct port100;
  
  typedef void (*port100_send_async_complete_t)(struct port100 *dev, void *arg,
  					      struct sk_buff *resp);

  /**
   * Setting sets structure for in_set_rf command
   *
   * @in_*_set_number: Represent the entry indexes in the port-100 RF Base Table.
   *              This table contains multiple RF setting sets required for RF
   *              communication.
   *
   * @in_*_comm_type: Theses fields set the communication type to be used.
   */
  struct port100_in_rf_setting {
  	u8 in_send_set_number;
  	u8 in_send_comm_type;
  	u8 in_recv_set_number;
  	u8 in_recv_comm_type;
  } __packed;
  
  #define PORT100_COMM_TYPE_IN_212F 0x01
  #define PORT100_COMM_TYPE_IN_424F 0x02
  #define PORT100_COMM_TYPE_IN_106A 0x03

  #define PORT100_COMM_TYPE_IN_106B 0x07

  
  static const struct port100_in_rf_setting in_rf_settings[] = {
  	[NFC_DIGITAL_RF_TECH_212F] = {
  		.in_send_set_number = 1,
  		.in_send_comm_type  = PORT100_COMM_TYPE_IN_212F,
  		.in_recv_set_number = 15,
  		.in_recv_comm_type  = PORT100_COMM_TYPE_IN_212F,
  	},
  	[NFC_DIGITAL_RF_TECH_424F] = {
  		.in_send_set_number = 1,
  		.in_send_comm_type  = PORT100_COMM_TYPE_IN_424F,
  		.in_recv_set_number = 15,
  		.in_recv_comm_type  = PORT100_COMM_TYPE_IN_424F,
  	},
  	[NFC_DIGITAL_RF_TECH_106A] = {
  		.in_send_set_number = 2,
  		.in_send_comm_type  = PORT100_COMM_TYPE_IN_106A,
  		.in_recv_set_number = 15,
  		.in_recv_comm_type  = PORT100_COMM_TYPE_IN_106A,
  	},

  	[NFC_DIGITAL_RF_TECH_106B] = {
  		.in_send_set_number = 3,
  		.in_send_comm_type  = PORT100_COMM_TYPE_IN_106B,
  		.in_recv_set_number = 15,
  		.in_recv_comm_type  = PORT100_COMM_TYPE_IN_106B,
  	},

  	/* Ensures the array has NFC_DIGITAL_RF_TECH_LAST elements */
  	[NFC_DIGITAL_RF_TECH_LAST] = { 0 },

  };

  /**
   * Setting sets structure for tg_set_rf command
   *
   * @tg_set_number: Represents the entry index in the port-100 RF Base Table.
   *                 This table contains multiple RF setting sets required for RF
   *                 communication. this field is used for both send and receive
   *                 settings.
   *
   * @tg_comm_type: Sets the communication type to be used to send and receive
   *                data.
   */
  struct port100_tg_rf_setting {
  	u8 tg_set_number;
  	u8 tg_comm_type;
  } __packed;
  
  #define PORT100_COMM_TYPE_TG_106A 0x0B
  #define PORT100_COMM_TYPE_TG_212F 0x0C
  #define PORT100_COMM_TYPE_TG_424F 0x0D
  
  static const struct port100_tg_rf_setting tg_rf_settings[] = {
  	[NFC_DIGITAL_RF_TECH_106A] = {
  		.tg_set_number = 8,
  		.tg_comm_type = PORT100_COMM_TYPE_TG_106A,
  	},
  	[NFC_DIGITAL_RF_TECH_212F] = {
  		.tg_set_number = 8,
  		.tg_comm_type = PORT100_COMM_TYPE_TG_212F,
  	},
  	[NFC_DIGITAL_RF_TECH_424F] = {
  		.tg_set_number = 8,
  		.tg_comm_type = PORT100_COMM_TYPE_TG_424F,
  	},

  	/* Ensures the array has NFC_DIGITAL_RF_TECH_LAST elements */
  	[NFC_DIGITAL_RF_TECH_LAST] = { 0 },

  };

  #define PORT100_IN_PROT_INITIAL_GUARD_TIME      0x00
  #define PORT100_IN_PROT_ADD_CRC                 0x01
  #define PORT100_IN_PROT_CHECK_CRC               0x02
  #define PORT100_IN_PROT_MULTI_CARD              0x03
  #define PORT100_IN_PROT_ADD_PARITY              0x04
  #define PORT100_IN_PROT_CHECK_PARITY            0x05
  #define PORT100_IN_PROT_BITWISE_AC_RECV_MODE    0x06
  #define PORT100_IN_PROT_VALID_BIT_NUMBER        0x07
  #define PORT100_IN_PROT_CRYPTO1                 0x08
  #define PORT100_IN_PROT_ADD_SOF                 0x09
  #define PORT100_IN_PROT_CHECK_SOF               0x0A
  #define PORT100_IN_PROT_ADD_EOF                 0x0B
  #define PORT100_IN_PROT_CHECK_EOF               0x0C
  #define PORT100_IN_PROT_DEAF_TIME               0x0E
  #define PORT100_IN_PROT_CRM                     0x0F
  #define PORT100_IN_PROT_CRM_MIN_LEN             0x10
  #define PORT100_IN_PROT_T1_TAG_FRAME            0x11
  #define PORT100_IN_PROT_RFCA                    0x12
  #define PORT100_IN_PROT_GUARD_TIME_AT_INITIATOR 0x13
  #define PORT100_IN_PROT_END                     0x14
  
  #define PORT100_IN_MAX_NUM_PROTOCOLS            19

  #define PORT100_TG_PROT_TU           0x00
  #define PORT100_TG_PROT_RF_OFF       0x01
  #define PORT100_TG_PROT_CRM          0x02
  #define PORT100_TG_PROT_END          0x03
  
  #define PORT100_TG_MAX_NUM_PROTOCOLS 3

  struct port100_protocol {
  	u8 number;
  	u8 value;
  } __packed;
  
  static struct port100_protocol
  in_protocols[][PORT100_IN_MAX_NUM_PROTOCOLS + 1] = {
  	[NFC_DIGITAL_FRAMING_NFCA_SHORT] = {
  		{ PORT100_IN_PROT_INITIAL_GUARD_TIME,      6 },
  		{ PORT100_IN_PROT_ADD_CRC,                 0 },
  		{ PORT100_IN_PROT_CHECK_CRC,               0 },
  		{ PORT100_IN_PROT_MULTI_CARD,              0 },
  		{ PORT100_IN_PROT_ADD_PARITY,              0 },
  		{ PORT100_IN_PROT_CHECK_PARITY,            1 },
  		{ PORT100_IN_PROT_BITWISE_AC_RECV_MODE,    0 },
  		{ PORT100_IN_PROT_VALID_BIT_NUMBER,        7 },
  		{ PORT100_IN_PROT_CRYPTO1,                 0 },
  		{ PORT100_IN_PROT_ADD_SOF,                 0 },
  		{ PORT100_IN_PROT_CHECK_SOF,               0 },
  		{ PORT100_IN_PROT_ADD_EOF,                 0 },
  		{ PORT100_IN_PROT_CHECK_EOF,               0 },
  		{ PORT100_IN_PROT_DEAF_TIME,               4 },
  		{ PORT100_IN_PROT_CRM,                     0 },
  		{ PORT100_IN_PROT_CRM_MIN_LEN,             0 },
  		{ PORT100_IN_PROT_T1_TAG_FRAME,            0 },
  		{ PORT100_IN_PROT_RFCA,                    0 },
  		{ PORT100_IN_PROT_GUARD_TIME_AT_INITIATOR, 6 },
  		{ PORT100_IN_PROT_END,                     0 },
  	},
  	[NFC_DIGITAL_FRAMING_NFCA_STANDARD] = {
  		{ PORT100_IN_PROT_INITIAL_GUARD_TIME,      6 },
  		{ PORT100_IN_PROT_ADD_CRC,                 0 },
  		{ PORT100_IN_PROT_CHECK_CRC,               0 },
  		{ PORT100_IN_PROT_MULTI_CARD,              0 },
  		{ PORT100_IN_PROT_ADD_PARITY,              1 },
  		{ PORT100_IN_PROT_CHECK_PARITY,            1 },
  		{ PORT100_IN_PROT_BITWISE_AC_RECV_MODE,    0 },
  		{ PORT100_IN_PROT_VALID_BIT_NUMBER,        8 },
  		{ PORT100_IN_PROT_CRYPTO1,                 0 },
  		{ PORT100_IN_PROT_ADD_SOF,                 0 },
  		{ PORT100_IN_PROT_CHECK_SOF,               0 },
  		{ PORT100_IN_PROT_ADD_EOF,                 0 },
  		{ PORT100_IN_PROT_CHECK_EOF,               0 },
  		{ PORT100_IN_PROT_DEAF_TIME,               4 },
  		{ PORT100_IN_PROT_CRM,                     0 },
  		{ PORT100_IN_PROT_CRM_MIN_LEN,             0 },
  		{ PORT100_IN_PROT_T1_TAG_FRAME,            0 },
  		{ PORT100_IN_PROT_RFCA,                    0 },
  		{ PORT100_IN_PROT_GUARD_TIME_AT_INITIATOR, 6 },
  		{ PORT100_IN_PROT_END,                     0 },
  	},
  	[NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A] = {
  		{ PORT100_IN_PROT_INITIAL_GUARD_TIME,      6 },
  		{ PORT100_IN_PROT_ADD_CRC,                 1 },
  		{ PORT100_IN_PROT_CHECK_CRC,               1 },
  		{ PORT100_IN_PROT_MULTI_CARD,              0 },
  		{ PORT100_IN_PROT_ADD_PARITY,              1 },
  		{ PORT100_IN_PROT_CHECK_PARITY,            1 },
  		{ PORT100_IN_PROT_BITWISE_AC_RECV_MODE,    0 },
  		{ PORT100_IN_PROT_VALID_BIT_NUMBER,        8 },
  		{ PORT100_IN_PROT_CRYPTO1,                 0 },
  		{ PORT100_IN_PROT_ADD_SOF,                 0 },
  		{ PORT100_IN_PROT_CHECK_SOF,               0 },
  		{ PORT100_IN_PROT_ADD_EOF,                 0 },
  		{ PORT100_IN_PROT_CHECK_EOF,               0 },
  		{ PORT100_IN_PROT_DEAF_TIME,               4 },
  		{ PORT100_IN_PROT_CRM,                     0 },
  		{ PORT100_IN_PROT_CRM_MIN_LEN,             0 },
  		{ PORT100_IN_PROT_T1_TAG_FRAME,            0 },
  		{ PORT100_IN_PROT_RFCA,                    0 },
  		{ PORT100_IN_PROT_GUARD_TIME_AT_INITIATOR, 6 },
  		{ PORT100_IN_PROT_END,                     0 },
  	},
  	[NFC_DIGITAL_FRAMING_NFCA_T1T] = {
  		/* nfc_digital_framing_nfca_short */
  		{ PORT100_IN_PROT_ADD_CRC,          2 },
  		{ PORT100_IN_PROT_CHECK_CRC,        2 },
  		{ PORT100_IN_PROT_VALID_BIT_NUMBER, 8 },
  		{ PORT100_IN_PROT_T1_TAG_FRAME,     2 },
  		{ PORT100_IN_PROT_END,              0 },
  	},
  	[NFC_DIGITAL_FRAMING_NFCA_T2T] = {
  		/* nfc_digital_framing_nfca_standard */
  		{ PORT100_IN_PROT_ADD_CRC,   1 },
  		{ PORT100_IN_PROT_CHECK_CRC, 0 },
  		{ PORT100_IN_PROT_END,       0 },
  	},

  	[NFC_DIGITAL_FRAMING_NFCA_T4T] = {
  		/* nfc_digital_framing_nfca_standard_with_crc_a */
  		{ PORT100_IN_PROT_END,       0 },
  	},

  	[NFC_DIGITAL_FRAMING_NFCA_NFC_DEP] = {
  		/* nfc_digital_framing_nfca_standard */
  		{ PORT100_IN_PROT_END, 0 },
  	},
  	[NFC_DIGITAL_FRAMING_NFCF] = {
  		{ PORT100_IN_PROT_INITIAL_GUARD_TIME,     18 },
  		{ PORT100_IN_PROT_ADD_CRC,                 1 },
  		{ PORT100_IN_PROT_CHECK_CRC,               1 },
  		{ PORT100_IN_PROT_MULTI_CARD,              0 },
  		{ PORT100_IN_PROT_ADD_PARITY,              0 },
  		{ PORT100_IN_PROT_CHECK_PARITY,            0 },
  		{ PORT100_IN_PROT_BITWISE_AC_RECV_MODE,    0 },
  		{ PORT100_IN_PROT_VALID_BIT_NUMBER,        8 },
  		{ PORT100_IN_PROT_CRYPTO1,                 0 },
  		{ PORT100_IN_PROT_ADD_SOF,                 0 },
  		{ PORT100_IN_PROT_CHECK_SOF,               0 },
  		{ PORT100_IN_PROT_ADD_EOF,                 0 },
  		{ PORT100_IN_PROT_CHECK_EOF,               0 },
  		{ PORT100_IN_PROT_DEAF_TIME,               4 },
  		{ PORT100_IN_PROT_CRM,                     0 },
  		{ PORT100_IN_PROT_CRM_MIN_LEN,             0 },
  		{ PORT100_IN_PROT_T1_TAG_FRAME,            0 },
  		{ PORT100_IN_PROT_RFCA,                    0 },
  		{ PORT100_IN_PROT_GUARD_TIME_AT_INITIATOR, 6 },
  		{ PORT100_IN_PROT_END,                     0 },
  	},
  	[NFC_DIGITAL_FRAMING_NFCF_T3T] = {
  		/* nfc_digital_framing_nfcf */
  		{ PORT100_IN_PROT_END, 0 },
  	},
  	[NFC_DIGITAL_FRAMING_NFCF_NFC_DEP] = {
  		/* nfc_digital_framing_nfcf */

  		{ PORT100_IN_PROT_INITIAL_GUARD_TIME,     18 },
  		{ PORT100_IN_PROT_ADD_CRC,                 1 },
  		{ PORT100_IN_PROT_CHECK_CRC,               1 },
  		{ PORT100_IN_PROT_MULTI_CARD,              0 },
  		{ PORT100_IN_PROT_ADD_PARITY,              0 },
  		{ PORT100_IN_PROT_CHECK_PARITY,            0 },
  		{ PORT100_IN_PROT_BITWISE_AC_RECV_MODE,    0 },
  		{ PORT100_IN_PROT_VALID_BIT_NUMBER,        8 },
  		{ PORT100_IN_PROT_CRYPTO1,                 0 },
  		{ PORT100_IN_PROT_ADD_SOF,                 0 },
  		{ PORT100_IN_PROT_CHECK_SOF,               0 },
  		{ PORT100_IN_PROT_ADD_EOF,                 0 },
  		{ PORT100_IN_PROT_CHECK_EOF,               0 },
  		{ PORT100_IN_PROT_DEAF_TIME,               4 },
  		{ PORT100_IN_PROT_CRM,                     0 },
  		{ PORT100_IN_PROT_CRM_MIN_LEN,             0 },
  		{ PORT100_IN_PROT_T1_TAG_FRAME,            0 },
  		{ PORT100_IN_PROT_RFCA,                    0 },
  		{ PORT100_IN_PROT_GUARD_TIME_AT_INITIATOR, 6 },
  		{ PORT100_IN_PROT_END,                     0 },

  	},
  	[NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED] = {
  		{ PORT100_IN_PROT_END, 0 },
  	},

  	[NFC_DIGITAL_FRAMING_NFCB] = {
  		{ PORT100_IN_PROT_INITIAL_GUARD_TIME,     20 },
  		{ PORT100_IN_PROT_ADD_CRC,                 1 },
  		{ PORT100_IN_PROT_CHECK_CRC,               1 },
  		{ PORT100_IN_PROT_MULTI_CARD,              0 },
  		{ PORT100_IN_PROT_ADD_PARITY,              0 },
  		{ PORT100_IN_PROT_CHECK_PARITY,            0 },
  		{ PORT100_IN_PROT_BITWISE_AC_RECV_MODE,    0 },
  		{ PORT100_IN_PROT_VALID_BIT_NUMBER,        8 },
  		{ PORT100_IN_PROT_CRYPTO1,                 0 },
  		{ PORT100_IN_PROT_ADD_SOF,                 1 },
  		{ PORT100_IN_PROT_CHECK_SOF,               1 },
  		{ PORT100_IN_PROT_ADD_EOF,                 1 },
  		{ PORT100_IN_PROT_CHECK_EOF,               1 },
  		{ PORT100_IN_PROT_DEAF_TIME,               4 },
  		{ PORT100_IN_PROT_CRM,                     0 },
  		{ PORT100_IN_PROT_CRM_MIN_LEN,             0 },
  		{ PORT100_IN_PROT_T1_TAG_FRAME,            0 },
  		{ PORT100_IN_PROT_RFCA,                    0 },
  		{ PORT100_IN_PROT_GUARD_TIME_AT_INITIATOR, 6 },
  		{ PORT100_IN_PROT_END,                     0 },
  	},
  	[NFC_DIGITAL_FRAMING_NFCB_T4T] = {
  		/* nfc_digital_framing_nfcb */
  		{ PORT100_IN_PROT_END,                     0 },
  	},

  	/* Ensures the array has NFC_DIGITAL_FRAMING_LAST elements */
  	[NFC_DIGITAL_FRAMING_LAST] = {
  		{ PORT100_IN_PROT_END, 0 },
  	},

  };

  static struct port100_protocol
  tg_protocols[][PORT100_TG_MAX_NUM_PROTOCOLS + 1] = {
  	[NFC_DIGITAL_FRAMING_NFCA_SHORT] = {
  		{ PORT100_TG_PROT_END, 0 },
  	},
  	[NFC_DIGITAL_FRAMING_NFCA_STANDARD] = {
  		{ PORT100_TG_PROT_END, 0 },
  	},
  	[NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A] = {
  		{ PORT100_TG_PROT_END, 0 },
  	},
  	[NFC_DIGITAL_FRAMING_NFCA_T1T] = {
  		{ PORT100_TG_PROT_END, 0 },
  	},
  	[NFC_DIGITAL_FRAMING_NFCA_T2T] = {
  		{ PORT100_TG_PROT_END, 0 },
  	},
  	[NFC_DIGITAL_FRAMING_NFCA_NFC_DEP] = {
  		{ PORT100_TG_PROT_TU,     1 },
  		{ PORT100_TG_PROT_RF_OFF, 0 },
  		{ PORT100_TG_PROT_CRM,    7 },
  		{ PORT100_TG_PROT_END,    0 },
  	},
  	[NFC_DIGITAL_FRAMING_NFCF] = {
  		{ PORT100_TG_PROT_END, 0 },
  	},
  	[NFC_DIGITAL_FRAMING_NFCF_T3T] = {
  		{ PORT100_TG_PROT_END, 0 },
  	},
  	[NFC_DIGITAL_FRAMING_NFCF_NFC_DEP] = {
  		{ PORT100_TG_PROT_TU,     1 },
  		{ PORT100_TG_PROT_RF_OFF, 0 },
  		{ PORT100_TG_PROT_CRM,    7 },
  		{ PORT100_TG_PROT_END,    0 },
  	},
  	[NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED] = {
  		{ PORT100_TG_PROT_RF_OFF, 1 },
  		{ PORT100_TG_PROT_END,    0 },
  	},

  	/* Ensures the array has NFC_DIGITAL_FRAMING_LAST elements */
  	[NFC_DIGITAL_FRAMING_LAST] = {
  		{ PORT100_TG_PROT_END,    0 },
  	},

  };

  struct port100 {
  	struct nfc_digital_dev *nfc_digital_dev;
  
  	int skb_headroom;
  	int skb_tailroom;
  
  	struct usb_device *udev;
  	struct usb_interface *interface;

  
  	struct urb *out_urb;
  	struct urb *in_urb;

  	/* This mutex protects the out_urb and avoids to submit a new command
  	 * through port100_send_frame_async() while the previous one is being
  	 * canceled through port100_abort_cmd().
  	 */
  	struct mutex out_urb_lock;

  	struct work_struct cmd_complete_work;
  
  	u8 cmd_type;
  
  	/* The digital stack serializes commands to be sent. There is no need
  	 * for any queuing/locking mechanism at driver level.
  	 */
  	struct port100_cmd *cmd;

  
  	bool cmd_cancel;

  	struct completion cmd_cancel_done;

  };
  
  struct port100_cmd {
  	u8 code;
  	int status;
  	struct sk_buff *req;
  	struct sk_buff *resp;
  	int resp_len;
  	port100_send_async_complete_t  complete_cb;
  	void *complete_cb_context;
  };
  
  struct port100_frame {
  	u8 preamble;
  	__be16 start_frame;
  	__be16 extended_frame;
  	__le16 datalen;
  	u8 datalen_checksum;
  	u8 data[];
  } __packed;
  
  struct port100_ack_frame {
  	u8 preamble;
  	__be16 start_frame;
  	__be16 ack_frame;
  	u8 postambule;
  } __packed;
  
  struct port100_cb_arg {
  	nfc_digital_cmd_complete_t complete_cb;
  	void *complete_arg;
  	u8 mdaa;

  };

  struct port100_tg_comm_rf_cmd {
  	__le16 guard_time;
  	__le16 send_timeout;
  	u8 mdaa;
  	u8 nfca_param[6];
  	u8 nfcf_param[18];
  	u8 mf_halted;
  	u8 arae_flag;
  	__le16 recv_timeout;
  	u8 data[];
  } __packed;

  struct port100_tg_comm_rf_res {
  	u8 comm_type;
  	u8 ar_status;
  	u8 target_activated;
  	__le32 status;
  	u8 data[];
  } __packed;

  /* The rule: value + checksum = 0 */
  static inline u8 port100_checksum(u16 value)
  {
  	return ~(((u8 *)&value)[0] + ((u8 *)&value)[1]) + 1;
  }
  
  /* The rule: sum(data elements) + checksum = 0 */
  static u8 port100_data_checksum(u8 *data, int datalen)
  {
  	u8 sum = 0;
  	int i;
  
  	for (i = 0; i < datalen; i++)
  		sum += data[i];
  
  	return port100_checksum(sum);
  }
  
  static void port100_tx_frame_init(void *_frame, u8 cmd_code)
  {
  	struct port100_frame *frame = _frame;
  
  	frame->preamble = 0;
  	frame->start_frame = cpu_to_be16(PORT100_FRAME_SOF);
  	frame->extended_frame = cpu_to_be16(PORT100_FRAME_EXT);
  	PORT100_FRAME_DIRECTION(frame) = PORT100_FRAME_DIR_OUT;
  	PORT100_FRAME_CMD(frame) = cmd_code;
  	frame->datalen = cpu_to_le16(2);
  }
  
  static void port100_tx_frame_finish(void *_frame)
  {
  	struct port100_frame *frame = _frame;
  
  	frame->datalen_checksum = port100_checksum(le16_to_cpu(frame->datalen));
  
  	PORT100_FRAME_CHECKSUM(frame) =
  		port100_data_checksum(frame->data, le16_to_cpu(frame->datalen));
  
  	PORT100_FRAME_POSTAMBLE(frame) = 0;
  }
  
  static void port100_tx_update_payload_len(void *_frame, int len)
  {
  	struct port100_frame *frame = _frame;

  	le16_add_cpu(&frame->datalen, len);

  }
  
  static bool port100_rx_frame_is_valid(void *_frame)
  {
  	u8 checksum;
  	struct port100_frame *frame = _frame;
  
  	if (frame->start_frame != cpu_to_be16(PORT100_FRAME_SOF) ||
  	    frame->extended_frame != cpu_to_be16(PORT100_FRAME_EXT))
  		return false;
  
  	checksum = port100_checksum(le16_to_cpu(frame->datalen));
  	if (checksum != frame->datalen_checksum)
  		return false;
  
  	checksum = port100_data_checksum(frame->data,
  					 le16_to_cpu(frame->datalen));
  	if (checksum != PORT100_FRAME_CHECKSUM(frame))
  		return false;
  
  	return true;
  }
  
  static bool port100_rx_frame_is_ack(struct port100_ack_frame *frame)
  {
  	return (frame->start_frame == cpu_to_be16(PORT100_FRAME_SOF) &&
  		frame->ack_frame == cpu_to_be16(PORT100_FRAME_ACK));
  }
  
  static inline int port100_rx_frame_size(void *frame)
  {
  	struct port100_frame *f = frame;
  
  	return sizeof(struct port100_frame) + le16_to_cpu(f->datalen) +
  	       PORT100_FRAME_TAIL_LEN;
  }
  
  static bool port100_rx_frame_is_cmd_response(struct port100 *dev, void *frame)
  {
  	struct port100_frame *f = frame;
  
  	return (PORT100_FRAME_CMD(f) == PORT100_CMD_RESPONSE(dev->cmd->code));
  }
  
  static void port100_recv_response(struct urb *urb)
  {
  	struct port100 *dev = urb->context;
  	struct port100_cmd *cmd = dev->cmd;
  	u8 *in_frame;
  
  	cmd->status = urb->status;
  
  	switch (urb->status) {
  	case 0:
  		break; /* success */
  	case -ECONNRESET:
  	case -ENOENT:
  		nfc_err(&dev->interface->dev,

  			"The urb has been canceled (status %d)
  ", urb->status);

  		goto sched_wq;
  	case -ESHUTDOWN:
  	default:

  		nfc_err(&dev->interface->dev, "Urb failure (status %d)
  ",

  			urb->status);
  		goto sched_wq;
  	}
  
  	in_frame = dev->in_urb->transfer_buffer;
  
  	if (!port100_rx_frame_is_valid(in_frame)) {

  		nfc_err(&dev->interface->dev, "Received an invalid frame
  ");

  		cmd->status = -EIO;
  		goto sched_wq;
  	}
  
  	print_hex_dump_debug("PORT100 RX: ", DUMP_PREFIX_NONE, 16, 1, in_frame,
  			     port100_rx_frame_size(in_frame), false);
  
  	if (!port100_rx_frame_is_cmd_response(dev, in_frame)) {
  		nfc_err(&dev->interface->dev,

  			"It's not the response to the last command
  ");

  		cmd->status = -EIO;
  		goto sched_wq;
  	}
  
  sched_wq:
  	schedule_work(&dev->cmd_complete_work);
  }
  
  static int port100_submit_urb_for_response(struct port100 *dev, gfp_t flags)
  {
  	dev->in_urb->complete = port100_recv_response;
  
  	return usb_submit_urb(dev->in_urb, flags);
  }
  
  static void port100_recv_ack(struct urb *urb)
  {
  	struct port100 *dev = urb->context;
  	struct port100_cmd *cmd = dev->cmd;
  	struct port100_ack_frame *in_frame;
  	int rc;
  
  	cmd->status = urb->status;
  
  	switch (urb->status) {
  	case 0:
  		break; /* success */
  	case -ECONNRESET:
  	case -ENOENT:
  		nfc_err(&dev->interface->dev,

  			"The urb has been stopped (status %d)
  ", urb->status);

  		goto sched_wq;
  	case -ESHUTDOWN:
  	default:

  		nfc_err(&dev->interface->dev, "Urb failure (status %d)
  ",

  			urb->status);
  		goto sched_wq;
  	}
  
  	in_frame = dev->in_urb->transfer_buffer;
  
  	if (!port100_rx_frame_is_ack(in_frame)) {

  		nfc_err(&dev->interface->dev, "Received an invalid ack
  ");

  		cmd->status = -EIO;
  		goto sched_wq;
  	}
  
  	rc = port100_submit_urb_for_response(dev, GFP_ATOMIC);
  	if (rc) {
  		nfc_err(&dev->interface->dev,

  			"usb_submit_urb failed with result %d
  ", rc);

  		cmd->status = rc;
  		goto sched_wq;
  	}
  
  	return;
  
  sched_wq:
  	schedule_work(&dev->cmd_complete_work);
  }
  
  static int port100_submit_urb_for_ack(struct port100 *dev, gfp_t flags)
  {
  	dev->in_urb->complete = port100_recv_ack;
  
  	return usb_submit_urb(dev->in_urb, flags);
  }
  
  static int port100_send_ack(struct port100 *dev)
  {

  	int rc = 0;

  	mutex_lock(&dev->out_urb_lock);

  	/*
  	 * If prior cancel is in-flight (dev->cmd_cancel == true), we
  	 * can skip to send cancel. Then this will wait the prior
  	 * cancel, or merged into the next cancel rarely if next
  	 * cancel was started before waiting done. In any case, this
  	 * will be waked up soon or later.
  	 */
  	if (!dev->cmd_cancel) {
  		reinit_completion(&dev->cmd_cancel_done);

  		usb_kill_urb(dev->out_urb);

  		dev->out_urb->transfer_buffer = ack_frame;
  		dev->out_urb->transfer_buffer_length = sizeof(ack_frame);
  		rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);

  		/*
  		 * Set the cmd_cancel flag only if the URB has been
  		 * successfully submitted. It will be reset by the out
  		 * URB completion callback port100_send_complete().
  		 */
  		dev->cmd_cancel = !rc;
  	}

  
  	mutex_unlock(&dev->out_urb_lock);

  	if (!rc)
  		wait_for_completion(&dev->cmd_cancel_done);

  	return rc;
  }
  
  static int port100_send_frame_async(struct port100 *dev, struct sk_buff *out,
  				    struct sk_buff *in, int in_len)
  {
  	int rc;

  	mutex_lock(&dev->out_urb_lock);
  
  	/* A command cancel frame as been sent through dev->out_urb. Don't try
  	 * to submit a new one.
  	 */
  	if (dev->cmd_cancel) {
  		rc = -EAGAIN;
  		goto exit;
  	}

  	dev->out_urb->transfer_buffer = out->data;
  	dev->out_urb->transfer_buffer_length = out->len;
  
  	dev->in_urb->transfer_buffer = in->data;
  	dev->in_urb->transfer_buffer_length = in_len;
  
  	print_hex_dump_debug("PORT100 TX: ", DUMP_PREFIX_NONE, 16, 1,
  			     out->data, out->len, false);
  
  	rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);
  	if (rc)

  		goto exit;

  
  	rc = port100_submit_urb_for_ack(dev, GFP_KERNEL);
  	if (rc)

  		usb_kill_urb(dev->out_urb);

  exit:
  	mutex_unlock(&dev->out_urb_lock);

  	return rc;
  }
  
  static void port100_build_cmd_frame(struct port100 *dev, u8 cmd_code,
  				    struct sk_buff *skb)
  {
  	/* payload is already there, just update datalen */
  	int payload_len = skb->len;
  
  	skb_push(skb, PORT100_FRAME_HEADER_LEN);
  	skb_put(skb, PORT100_FRAME_TAIL_LEN);
  
  	port100_tx_frame_init(skb->data, cmd_code);
  	port100_tx_update_payload_len(skb->data, payload_len);
  	port100_tx_frame_finish(skb->data);
  }
  
  static void port100_send_async_complete(struct port100 *dev)
  {
  	struct port100_cmd *cmd = dev->cmd;
  	int status = cmd->status;
  
  	struct sk_buff *req = cmd->req;
  	struct sk_buff *resp = cmd->resp;
  
  	dev_kfree_skb(req);
  
  	dev->cmd = NULL;
  
  	if (status < 0) {
  		cmd->complete_cb(dev, cmd->complete_cb_context,
  				 ERR_PTR(status));
  		dev_kfree_skb(resp);
  		goto done;
  	}
  
  	skb_put(resp, port100_rx_frame_size(resp->data));
  	skb_pull(resp, PORT100_FRAME_HEADER_LEN);
  	skb_trim(resp, resp->len - PORT100_FRAME_TAIL_LEN);
  
  	cmd->complete_cb(dev, cmd->complete_cb_context, resp);
  
  done:
  	kfree(cmd);
  }
  
  static int port100_send_cmd_async(struct port100 *dev, u8 cmd_code,
  				struct sk_buff *req,
  				port100_send_async_complete_t complete_cb,
  				void *complete_cb_context)
  {
  	struct port100_cmd *cmd;
  	struct sk_buff *resp;
  	int rc;
  	int  resp_len = PORT100_FRAME_HEADER_LEN +
  			PORT100_FRAME_MAX_PAYLOAD_LEN +
  			PORT100_FRAME_TAIL_LEN;

  	if (dev->cmd) {
  		nfc_err(&dev->interface->dev,
  			"A command is still in process
  ");
  		return -EBUSY;
  	}

  	resp = alloc_skb(resp_len, GFP_KERNEL);
  	if (!resp)
  		return -ENOMEM;
  
  	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
  	if (!cmd) {
  		dev_kfree_skb(resp);
  		return -ENOMEM;
  	}
  
  	cmd->code = cmd_code;
  	cmd->req = req;
  	cmd->resp = resp;
  	cmd->resp_len = resp_len;
  	cmd->complete_cb = complete_cb;
  	cmd->complete_cb_context = complete_cb_context;
  
  	port100_build_cmd_frame(dev, cmd_code, req);
  
  	dev->cmd = cmd;
  
  	rc = port100_send_frame_async(dev, req, resp, resp_len);
  	if (rc) {
  		kfree(cmd);
  		dev_kfree_skb(resp);
  		dev->cmd = NULL;
  	}
  
  	return rc;
  }
  
  struct port100_sync_cmd_response {
  	struct sk_buff *resp;
  	struct completion done;
  };
  
  static void port100_wq_cmd_complete(struct work_struct *work)
  {
  	struct port100 *dev = container_of(work, struct port100,
  					   cmd_complete_work);
  
  	port100_send_async_complete(dev);
  }
  
  static void port100_send_sync_complete(struct port100 *dev, void *_arg,
  				      struct sk_buff *resp)
  {
  	struct port100_sync_cmd_response *arg = _arg;
  
  	arg->resp = resp;
  	complete(&arg->done);
  }
  
  static struct sk_buff *port100_send_cmd_sync(struct port100 *dev, u8 cmd_code,
  					     struct sk_buff *req)
  {
  	int rc;
  	struct port100_sync_cmd_response arg;
  
  	init_completion(&arg.done);
  
  	rc = port100_send_cmd_async(dev, cmd_code, req,
  				    port100_send_sync_complete, &arg);
  	if (rc) {
  		dev_kfree_skb(req);
  		return ERR_PTR(rc);
  	}
  
  	wait_for_completion(&arg.done);
  
  	return arg.resp;
  }
  
  static void port100_send_complete(struct urb *urb)
  {
  	struct port100 *dev = urb->context;

  	if (dev->cmd_cancel) {

  		complete_all(&dev->cmd_cancel_done);

  		dev->cmd_cancel = false;

  	}

  	switch (urb->status) {
  	case 0:
  		break; /* success */
  	case -ECONNRESET:
  	case -ENOENT:
  		nfc_err(&dev->interface->dev,

  			"The urb has been stopped (status %d)
  ", urb->status);

  		break;
  	case -ESHUTDOWN:
  	default:

  		nfc_err(&dev->interface->dev, "Urb failure (status %d)
  ",

  			urb->status);
  	}
  }

  static void port100_abort_cmd(struct nfc_digital_dev *ddev)
  {

  	struct port100 *dev = nfc_digital_get_drvdata(ddev);
  
  	/* An ack will cancel the last issued command */
  	port100_send_ack(dev);
  
  	/* cancel the urb request */
  	usb_kill_urb(dev->in_urb);
  }
  
  static struct sk_buff *port100_alloc_skb(struct port100 *dev, unsigned int size)
  {
  	struct sk_buff *skb;
  
  	skb = alloc_skb(dev->skb_headroom + dev->skb_tailroom + size,
  			GFP_KERNEL);
  	if (skb)
  		skb_reserve(skb, dev->skb_headroom);
  
  	return skb;
  }
  
  static int port100_set_command_type(struct port100 *dev, u8 command_type)
  {
  	struct sk_buff *skb;
  	struct sk_buff *resp;
  	int rc;
  
  	skb = port100_alloc_skb(dev, 1);
  	if (!skb)
  		return -ENOMEM;

  	skb_put_u8(skb, command_type);

  
  	resp = port100_send_cmd_sync(dev, PORT100_CMD_SET_COMMAND_TYPE, skb);
  	if (IS_ERR(resp))
  		return PTR_ERR(resp);
  
  	rc = resp->data[0];
  
  	dev_kfree_skb(resp);
  
  	return rc;
  }
  
  static u64 port100_get_command_type_mask(struct port100 *dev)
  {
  	struct sk_buff *skb;
  	struct sk_buff *resp;
  	u64 mask;
  
  	skb = port100_alloc_skb(dev, 0);
  	if (!skb)
  		return -ENOMEM;
  
  	resp = port100_send_cmd_sync(dev, PORT100_CMD_GET_COMMAND_TYPE, skb);
  	if (IS_ERR(resp))
  		return PTR_ERR(resp);
  
  	if (resp->len < 8)
  		mask = 0;
  	else
  		mask = be64_to_cpu(*(__be64 *)resp->data);
  
  	dev_kfree_skb(resp);
  
  	return mask;
  }
  
  static u16 port100_get_firmware_version(struct port100 *dev)
  {
  	struct sk_buff *skb;
  	struct sk_buff *resp;
  	u16 fw_ver;
  
  	skb = port100_alloc_skb(dev, 0);
  	if (!skb)
  		return 0;
  
  	resp = port100_send_cmd_sync(dev, PORT100_CMD_GET_FIRMWARE_VERSION,
  				     skb);
  	if (IS_ERR(resp))
  		return 0;
  
  	fw_ver = le16_to_cpu(*(__le16 *)resp->data);
  
  	dev_kfree_skb(resp);
  
  	return fw_ver;

  }
  
  static int port100_switch_rf(struct nfc_digital_dev *ddev, bool on)
  {

  	struct port100 *dev = nfc_digital_get_drvdata(ddev);
  	struct sk_buff *skb, *resp;
  
  	skb = port100_alloc_skb(dev, 1);
  	if (!skb)
  		return -ENOMEM;

  	skb_put_u8(skb, on ? 1 : 0);

  	/* Cancel the last command if the device is being switched off */
  	if (!on)
  		port100_abort_cmd(ddev);

  	resp = port100_send_cmd_sync(dev, PORT100_CMD_SWITCH_RF, skb);
  
  	if (IS_ERR(resp))
  		return PTR_ERR(resp);
  
  	dev_kfree_skb(resp);
  
  	return 0;
  }
  
  static int port100_in_set_rf(struct nfc_digital_dev *ddev, u8 rf)
  {
  	struct port100 *dev = nfc_digital_get_drvdata(ddev);
  	struct sk_buff *skb;
  	struct sk_buff *resp;
  	int rc;
  
  	if (rf >= NFC_DIGITAL_RF_TECH_LAST)
  		return -EINVAL;
  
  	skb = port100_alloc_skb(dev, sizeof(struct port100_in_rf_setting));
  	if (!skb)
  		return -ENOMEM;

  	skb_put_data(skb, &in_rf_settings[rf],
  		     sizeof(struct port100_in_rf_setting));

  
  	resp = port100_send_cmd_sync(dev, PORT100_CMD_IN_SET_RF, skb);
  
  	if (IS_ERR(resp))
  		return PTR_ERR(resp);
  
  	rc = resp->data[0];
  
  	dev_kfree_skb(resp);
  
  	return rc;
  }
  
  static int port100_in_set_framing(struct nfc_digital_dev *ddev, int param)
  {
  	struct port100 *dev = nfc_digital_get_drvdata(ddev);
  	struct port100_protocol *protocols;
  	struct sk_buff *skb;
  	struct sk_buff *resp;
  	int num_protocols;
  	size_t size;
  	int rc;
  
  	if (param >= NFC_DIGITAL_FRAMING_LAST)
  		return -EINVAL;
  
  	protocols = in_protocols[param];
  
  	num_protocols = 0;
  	while (protocols[num_protocols].number != PORT100_IN_PROT_END)
  		num_protocols++;
  
  	if (!num_protocols)
  		return 0;
  
  	size = sizeof(struct port100_protocol) * num_protocols;
  
  	skb = port100_alloc_skb(dev, size);
  	if (!skb)
  		return -ENOMEM;

  	skb_put_data(skb, protocols, size);

  
  	resp = port100_send_cmd_sync(dev, PORT100_CMD_IN_SET_PROTOCOL, skb);
  
  	if (IS_ERR(resp))
  		return PTR_ERR(resp);
  
  	rc = resp->data[0];
  
  	dev_kfree_skb(resp);
  
  	return rc;

  }
  
  static int port100_in_configure_hw(struct nfc_digital_dev *ddev, int type,
  				   int param)
  {

  	if (type == NFC_DIGITAL_CONFIG_RF_TECH)
  		return port100_in_set_rf(ddev, param);
  
  	if (type == NFC_DIGITAL_CONFIG_FRAMING)
  		return port100_in_set_framing(ddev, param);
  
  	return -EINVAL;
  }
  
  static void port100_in_comm_rf_complete(struct port100 *dev, void *arg,
  				       struct sk_buff *resp)
  {
  	struct port100_cb_arg *cb_arg = arg;
  	nfc_digital_cmd_complete_t cb = cb_arg->complete_cb;
  	u32 status;
  	int rc;
  
  	if (IS_ERR(resp)) {
  		rc =  PTR_ERR(resp);
  		goto exit;
  	}
  
  	if (resp->len < 4) {
  		nfc_err(&dev->interface->dev,

  			"Invalid packet length received
  ");

  		rc = -EIO;
  		goto error;
  	}
  
  	status = le32_to_cpu(*(__le32 *)resp->data);
  
  	skb_pull(resp, sizeof(u32));
  
  	if (status == PORT100_CMD_STATUS_TIMEOUT) {
  		rc = -ETIMEDOUT;
  		goto error;
  	}
  
  	if (status != PORT100_CMD_STATUS_OK) {
  		nfc_err(&dev->interface->dev,
  			"in_comm_rf failed with status 0x%08x
  ", status);
  		rc = -EIO;
  		goto error;
  	}
  
  	/* Remove collision bits byte */
  	skb_pull(resp, 1);
  
  	goto exit;
  
  error:
  	kfree_skb(resp);
  	resp = ERR_PTR(rc);
  
  exit:
  	cb(dev->nfc_digital_dev, cb_arg->complete_arg, resp);
  
  	kfree(cb_arg);

  }
  
  static int port100_in_send_cmd(struct nfc_digital_dev *ddev,
  			       struct sk_buff *skb, u16 _timeout,
  			       nfc_digital_cmd_complete_t cb, void *arg)
  {

  	struct port100 *dev = nfc_digital_get_drvdata(ddev);
  	struct port100_cb_arg *cb_arg;
  	__le16 timeout;
  
  	cb_arg = kzalloc(sizeof(struct port100_cb_arg), GFP_KERNEL);
  	if (!cb_arg)
  		return -ENOMEM;
  
  	cb_arg->complete_cb = cb;
  	cb_arg->complete_arg = arg;
  
  	timeout = cpu_to_le16(_timeout * 10);
  
  	memcpy(skb_push(skb, sizeof(__le16)), &timeout, sizeof(__le16));
  
  	return port100_send_cmd_async(dev, PORT100_CMD_IN_COMM_RF, skb,
  				      port100_in_comm_rf_complete, cb_arg);

  }

  static int port100_tg_set_rf(struct nfc_digital_dev *ddev, u8 rf)
  {
  	struct port100 *dev = nfc_digital_get_drvdata(ddev);
  	struct sk_buff *skb;
  	struct sk_buff *resp;
  	int rc;
  
  	if (rf >= NFC_DIGITAL_RF_TECH_LAST)
  		return -EINVAL;
  
  	skb = port100_alloc_skb(dev, sizeof(struct port100_tg_rf_setting));
  	if (!skb)
  		return -ENOMEM;

  	skb_put_data(skb, &tg_rf_settings[rf],
  		     sizeof(struct port100_tg_rf_setting));

  
  	resp = port100_send_cmd_sync(dev, PORT100_CMD_TG_SET_RF, skb);
  
  	if (IS_ERR(resp))
  		return PTR_ERR(resp);
  
  	rc = resp->data[0];
  
  	dev_kfree_skb(resp);
  
  	return rc;
  }
  
  static int port100_tg_set_framing(struct nfc_digital_dev *ddev, int param)
  {
  	struct port100 *dev = nfc_digital_get_drvdata(ddev);
  	struct port100_protocol *protocols;
  	struct sk_buff *skb;
  	struct sk_buff *resp;
  	int rc;
  	int num_protocols;
  	size_t size;
  
  	if (param >= NFC_DIGITAL_FRAMING_LAST)
  		return -EINVAL;
  
  	protocols = tg_protocols[param];
  
  	num_protocols = 0;
  	while (protocols[num_protocols].number != PORT100_TG_PROT_END)
  		num_protocols++;
  
  	if (!num_protocols)
  		return 0;
  
  	size = sizeof(struct port100_protocol) * num_protocols;
  
  	skb = port100_alloc_skb(dev, size);
  	if (!skb)
  		return -ENOMEM;

  	skb_put_data(skb, protocols, size);

  
  	resp = port100_send_cmd_sync(dev, PORT100_CMD_TG_SET_PROTOCOL, skb);
  
  	if (IS_ERR(resp))
  		return PTR_ERR(resp);
  
  	rc = resp->data[0];
  
  	dev_kfree_skb(resp);
  
  	return rc;
  }

  static int port100_tg_configure_hw(struct nfc_digital_dev *ddev, int type,
  				   int param)
  {

  	if (type == NFC_DIGITAL_CONFIG_RF_TECH)
  		return port100_tg_set_rf(ddev, param);
  
  	if (type == NFC_DIGITAL_CONFIG_FRAMING)
  		return port100_tg_set_framing(ddev, param);
  
  	return -EINVAL;
  }
  
  static bool port100_tg_target_activated(struct port100 *dev, u8 tgt_activated)
  {
  	u8 mask;
  
  	switch (dev->cmd_type) {
  	case PORT100_CMD_TYPE_0:
  		mask = PORT100_MDAA_TGT_HAS_BEEN_ACTIVATED_MASK;
  		break;
  	case PORT100_CMD_TYPE_1:
  		mask = PORT100_MDAA_TGT_HAS_BEEN_ACTIVATED_MASK |
  		       PORT100_MDAA_TGT_WAS_ACTIVATED_MASK;
  		break;
  	default:

  		nfc_err(&dev->interface->dev, "Unknown command type
  ");

  		return false;
  	}
  
  	return ((tgt_activated & mask) == mask);
  }
  
  static void port100_tg_comm_rf_complete(struct port100 *dev, void *arg,
  					struct sk_buff *resp)
  {
  	u32 status;
  	struct port100_cb_arg *cb_arg = arg;
  	nfc_digital_cmd_complete_t cb = cb_arg->complete_cb;
  	struct port100_tg_comm_rf_res *hdr;
  
  	if (IS_ERR(resp))
  		goto exit;
  
  	hdr = (struct port100_tg_comm_rf_res *)resp->data;
  
  	status = le32_to_cpu(hdr->status);
  
  	if (cb_arg->mdaa &&
  	    !port100_tg_target_activated(dev, hdr->target_activated)) {
  		kfree_skb(resp);
  		resp = ERR_PTR(-ETIMEDOUT);
  
  		goto exit;
  	}
  
  	skb_pull(resp, sizeof(struct port100_tg_comm_rf_res));
  
  	if (status != PORT100_CMD_STATUS_OK) {
  		kfree_skb(resp);
  
  		if (status == PORT100_CMD_STATUS_TIMEOUT)
  			resp = ERR_PTR(-ETIMEDOUT);
  		else
  			resp = ERR_PTR(-EIO);
  	}
  
  exit:
  	cb(dev->nfc_digital_dev, cb_arg->complete_arg, resp);
  
  	kfree(cb_arg);

  }
  
  static int port100_tg_send_cmd(struct nfc_digital_dev *ddev,
  			       struct sk_buff *skb, u16 timeout,
  			       nfc_digital_cmd_complete_t cb, void *arg)
  {

  	struct port100 *dev = nfc_digital_get_drvdata(ddev);
  	struct port100_tg_comm_rf_cmd *hdr;
  	struct port100_cb_arg *cb_arg;
  
  	cb_arg = kzalloc(sizeof(struct port100_cb_arg), GFP_KERNEL);
  	if (!cb_arg)
  		return -ENOMEM;
  
  	cb_arg->complete_cb = cb;
  	cb_arg->complete_arg = arg;
  
  	skb_push(skb, sizeof(struct port100_tg_comm_rf_cmd));
  
  	hdr = (struct port100_tg_comm_rf_cmd *)skb->data;
  
  	memset(hdr, 0, sizeof(struct port100_tg_comm_rf_cmd));
  	hdr->guard_time = cpu_to_le16(500);
  	hdr->send_timeout = cpu_to_le16(0xFFFF);
  	hdr->recv_timeout = cpu_to_le16(timeout);
  
  	return port100_send_cmd_async(dev, PORT100_CMD_TG_COMM_RF, skb,
  				      port100_tg_comm_rf_complete, cb_arg);

  }
  
  static int port100_listen_mdaa(struct nfc_digital_dev *ddev,
  			       struct digital_tg_mdaa_params *params,
  			       u16 timeout,
  			       nfc_digital_cmd_complete_t cb, void *arg)
  {

  	struct port100 *dev = nfc_digital_get_drvdata(ddev);
  	struct port100_tg_comm_rf_cmd *hdr;
  	struct port100_cb_arg *cb_arg;
  	struct sk_buff *skb;
  	int rc;
  
  	rc = port100_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH,
  				     NFC_DIGITAL_RF_TECH_106A);
  	if (rc)
  		return rc;
  
  	rc = port100_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
  				     NFC_DIGITAL_FRAMING_NFCA_NFC_DEP);
  	if (rc)
  		return rc;
  
  	cb_arg = kzalloc(sizeof(struct port100_cb_arg), GFP_KERNEL);
  	if (!cb_arg)
  		return -ENOMEM;
  
  	cb_arg->complete_cb = cb;
  	cb_arg->complete_arg = arg;
  	cb_arg->mdaa = 1;
  
  	skb = port100_alloc_skb(dev, 0);
  	if (!skb) {
  		kfree(cb_arg);
  		return -ENOMEM;
  	}
  
  	skb_push(skb, sizeof(struct port100_tg_comm_rf_cmd));
  	hdr = (struct port100_tg_comm_rf_cmd *)skb->data;
  
  	memset(hdr, 0, sizeof(struct port100_tg_comm_rf_cmd));
  
  	hdr->guard_time = 0;
  	hdr->send_timeout = cpu_to_le16(0xFFFF);
  	hdr->mdaa = 1;
  	hdr->nfca_param[0] = (params->sens_res >> 8) & 0xFF;
  	hdr->nfca_param[1] = params->sens_res & 0xFF;
  	memcpy(hdr->nfca_param + 2, params->nfcid1, 3);
  	hdr->nfca_param[5] = params->sel_res;
  	memcpy(hdr->nfcf_param, params->nfcid2, 8);
  	hdr->nfcf_param[16] = (params->sc >> 8) & 0xFF;
  	hdr->nfcf_param[17] = params->sc & 0xFF;
  	hdr->recv_timeout = cpu_to_le16(timeout);
  
  	return port100_send_cmd_async(dev, PORT100_CMD_TG_COMM_RF, skb,
  				      port100_tg_comm_rf_complete, cb_arg);

  }
  
  static int port100_listen(struct nfc_digital_dev *ddev, u16 timeout,
  			  nfc_digital_cmd_complete_t cb, void *arg)
  {

  	struct port100 *dev = nfc_digital_get_drvdata(ddev);
  	struct sk_buff *skb;
  
  	skb = port100_alloc_skb(dev, 0);
  	if (!skb)
  		return -ENOMEM;
  
  	return port100_tg_send_cmd(ddev, skb, timeout, cb, arg);

  }
  
  static struct nfc_digital_ops port100_digital_ops = {
  	.in_configure_hw = port100_in_configure_hw,
  	.in_send_cmd = port100_in_send_cmd,
  
  	.tg_listen_mdaa = port100_listen_mdaa,
  	.tg_listen = port100_listen,
  	.tg_configure_hw = port100_tg_configure_hw,
  	.tg_send_cmd = port100_tg_send_cmd,
  
  	.switch_rf = port100_switch_rf,
  	.abort_cmd = port100_abort_cmd,
  };
  
  static const struct usb_device_id port100_table[] = {

  	{ USB_DEVICE(SONY_VENDOR_ID, RCS380S_PRODUCT_ID), },
  	{ USB_DEVICE(SONY_VENDOR_ID, RCS380P_PRODUCT_ID), },

  	{ }
  };
  MODULE_DEVICE_TABLE(usb, port100_table);
  
  static int port100_probe(struct usb_interface *interface,
  			 const struct usb_device_id *id)
  {
  	struct port100 *dev;
  	int rc;

  	struct usb_host_interface *iface_desc;
  	struct usb_endpoint_descriptor *endpoint;
  	int in_endpoint;
  	int out_endpoint;
  	u16 fw_version;
  	u64 cmd_type_mask;
  	int i;

  
  	dev = devm_kzalloc(&interface->dev, sizeof(struct port100), GFP_KERNEL);
  	if (!dev)
  		return -ENOMEM;

  	mutex_init(&dev->out_urb_lock);

  	dev->udev = usb_get_dev(interface_to_usbdev(interface));
  	dev->interface = interface;
  	usb_set_intfdata(interface, dev);

  	in_endpoint = out_endpoint = 0;
  	iface_desc = interface->cur_altsetting;
  	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
  		endpoint = &iface_desc->endpoint[i].desc;
  
  		if (!in_endpoint && usb_endpoint_is_bulk_in(endpoint))
  			in_endpoint = endpoint->bEndpointAddress;
  
  		if (!out_endpoint && usb_endpoint_is_bulk_out(endpoint))
  			out_endpoint = endpoint->bEndpointAddress;
  	}
  
  	if (!in_endpoint || !out_endpoint) {
  		nfc_err(&interface->dev,
  			"Could not find bulk-in or bulk-out endpoint
  ");
  		rc = -ENODEV;
  		goto error;
  	}
  
  	dev->in_urb = usb_alloc_urb(0, GFP_KERNEL);
  	dev->out_urb = usb_alloc_urb(0, GFP_KERNEL);
  
  	if (!dev->in_urb || !dev->out_urb) {
  		nfc_err(&interface->dev, "Could not allocate USB URBs
  ");
  		rc = -ENOMEM;
  		goto error;
  	}
  
  	usb_fill_bulk_urb(dev->in_urb, dev->udev,
  			  usb_rcvbulkpipe(dev->udev, in_endpoint),
  			  NULL, 0, NULL, dev);
  	usb_fill_bulk_urb(dev->out_urb, dev->udev,
  			  usb_sndbulkpipe(dev->udev, out_endpoint),
  			  NULL, 0, port100_send_complete, dev);

  	dev->out_urb->transfer_flags = URB_ZERO_PACKET;

  
  	dev->skb_headroom = PORT100_FRAME_HEADER_LEN +
  			    PORT100_COMM_RF_HEAD_MAX_LEN;
  	dev->skb_tailroom = PORT100_FRAME_TAIL_LEN;

  	init_completion(&dev->cmd_cancel_done);

  	INIT_WORK(&dev->cmd_complete_work, port100_wq_cmd_complete);
  
  	/* The first thing to do with the Port-100 is to set the command type
  	 * to be used. If supported we use command type 1. 0 otherwise.
  	 */
  	cmd_type_mask = port100_get_command_type_mask(dev);
  	if (!cmd_type_mask) {
  		nfc_err(&interface->dev,

  			"Could not get supported command types
  ");

  		rc = -ENODEV;
  		goto error;
  	}
  
  	if (PORT100_CMD_TYPE_IS_SUPPORTED(cmd_type_mask, PORT100_CMD_TYPE_1))
  		dev->cmd_type = PORT100_CMD_TYPE_1;
  	else
  		dev->cmd_type = PORT100_CMD_TYPE_0;
  
  	rc = port100_set_command_type(dev, dev->cmd_type);
  	if (rc) {
  		nfc_err(&interface->dev,

  			"The device does not support command type %u
  ",

  			dev->cmd_type);
  		goto error;
  	}
  
  	fw_version = port100_get_firmware_version(dev);
  	if (!fw_version)
  		nfc_err(&interface->dev,

  			"Could not get device firmware version
  ");

  
  	nfc_info(&interface->dev,
  		 "Sony NFC Port-100 Series attached (firmware v%x.%02x)
  ",
  		 (fw_version & 0xFF00) >> 8, fw_version & 0xFF);

  
  	dev->nfc_digital_dev = nfc_digital_allocate_device(&port100_digital_ops,
  							   PORT100_PROTOCOLS,
  							   PORT100_CAPABILITIES,
  							   dev->skb_headroom,
  							   dev->skb_tailroom);
  	if (!dev->nfc_digital_dev) {
  		nfc_err(&interface->dev,

  			"Could not allocate nfc_digital_dev
  ");

  		rc = -ENOMEM;
  		goto error;
  	}
  
  	nfc_digital_set_parent_dev(dev->nfc_digital_dev, &interface->dev);
  	nfc_digital_set_drvdata(dev->nfc_digital_dev, dev);
  
  	rc = nfc_digital_register_device(dev->nfc_digital_dev);
  	if (rc) {
  		nfc_err(&interface->dev,

  			"Could not register digital device
  ");

  		goto free_nfc_dev;
  	}
  
  	return 0;
  
  free_nfc_dev:
  	nfc_digital_free_device(dev->nfc_digital_dev);
  
  error:

  	usb_free_urb(dev->in_urb);
  	usb_free_urb(dev->out_urb);
  	usb_put_dev(dev->udev);

  	return rc;
  }
  
  static void port100_disconnect(struct usb_interface *interface)
  {
  	struct port100 *dev;
  
  	dev = usb_get_intfdata(interface);
  	usb_set_intfdata(interface, NULL);
  
  	nfc_digital_unregister_device(dev->nfc_digital_dev);
  	nfc_digital_free_device(dev->nfc_digital_dev);

  	usb_kill_urb(dev->in_urb);
  	usb_kill_urb(dev->out_urb);
  
  	usb_free_urb(dev->in_urb);
  	usb_free_urb(dev->out_urb);

  	usb_put_dev(dev->udev);

  
  	kfree(dev->cmd);

  	nfc_info(&interface->dev, "Sony Port-100 NFC device disconnected
  ");

  }
  
  static struct usb_driver port100_driver = {
  	.name =		"port100",
  	.probe =	port100_probe,
  	.disconnect =	port100_disconnect,
  	.id_table =	port100_table,
  };
  
  module_usb_driver(port100_driver);
  
  MODULE_DESCRIPTION("NFC Port-100 series usb driver ver " VERSION);
  MODULE_VERSION(VERSION);
  MODULE_LICENSE("GPL");