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NFC: Driver for NXP Semiconductors PN544 NFC chip.

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Creates a new "Near Field Communication" subsystem in drivers/nfc.
http://en.wikipedia.org/wiki/Near_Field_Communication is useful ;)

This is a driver for the pn544 NFC device. The driver transfers
ETSI messages between the device and the user space.

Signed-off-by: Matti J. Aaltonen <matti.j.aaltonen@nokia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matti J. Aaltonen
2011-01-12 17:00:47 -08:00
committed by Linus Torvalds
parent 6164281ab7
commit 0329326e85
7 changed files with 1140 additions and 1 deletions
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97
include/linux/nfc/pn544.h Normal file
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/*
* Driver include for the PN544 NFC chip.
*
* Copyright (C) Nokia Corporation
*
* Author: Jari Vanhala <ext-jari.vanhala@nokia.com>
* Contact: Matti Aaltoenn <matti.j.aaltonen@nokia.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _PN544_H_
#define _PN544_H_
#include <linux/i2c.h>
#define PN544_DRIVER_NAME "pn544"
#define PN544_MAXWINDOW_SIZE 7
#define PN544_WINDOW_SIZE 4
#define PN544_RETRIES 10
#define PN544_MAX_I2C_TRANSFER 0x0400
#define PN544_MSG_MAX_SIZE 0x21 /* at normal HCI mode */
/* ioctl */
#define PN544_CHAR_BASE 'P'
#define PN544_IOR(num, dtype) _IOR(PN544_CHAR_BASE, num, dtype)
#define PN544_IOW(num, dtype) _IOW(PN544_CHAR_BASE, num, dtype)
#define PN544_GET_FW_MODE PN544_IOW(1, unsigned int)
#define PN544_SET_FW_MODE PN544_IOW(2, unsigned int)
#define PN544_GET_DEBUG PN544_IOW(3, unsigned int)
#define PN544_SET_DEBUG PN544_IOW(4, unsigned int)
/* Timing restrictions (ms) */
#define PN544_RESETVEN_TIME 30 /* 7 */
#define PN544_PVDDVEN_TIME 0
#define PN544_VBATVEN_TIME 0
#define PN544_GPIO4VEN_TIME 0
#define PN544_WAKEUP_ACK 5
#define PN544_WAKEUP_GUARD (PN544_WAKEUP_ACK + 1)
#define PN544_INACTIVITY_TIME 1000
#define PN544_INTERFRAME_DELAY 200 /* us */
#define PN544_BAUDRATE_CHANGE 150 /* us */
/* Debug bits */
#define PN544_DEBUG_BUF 0x01
#define PN544_DEBUG_READ 0x02
#define PN544_DEBUG_WRITE 0x04
#define PN544_DEBUG_IRQ 0x08
#define PN544_DEBUG_CALLS 0x10
#define PN544_DEBUG_MODE 0x20
/* Normal (HCI) mode */
#define PN544_LLC_HCI_OVERHEAD 3 /* header + crc (to length) */
#define PN544_LLC_MIN_SIZE (1 + PN544_LLC_HCI_OVERHEAD) /* length + */
#define PN544_LLC_MAX_DATA (PN544_MSG_MAX_SIZE - 2)
#define PN544_LLC_MAX_HCI_SIZE (PN544_LLC_MAX_DATA - 2)
struct pn544_llc_packet {
unsigned char length; /* of rest of packet */
unsigned char header;
unsigned char data[PN544_LLC_MAX_DATA]; /* includes crc-ccitt */
};
/* Firmware upgrade mode */
#define PN544_FW_HEADER_SIZE 3
/* max fw transfer is 1024bytes, but I2C limits it to 0xC0 */
#define PN544_MAX_FW_DATA (PN544_MAX_I2C_TRANSFER - PN544_FW_HEADER_SIZE)
struct pn544_fw_packet {
unsigned char command; /* status in answer */
unsigned char length[2]; /* big-endian order (msf) */
unsigned char data[PN544_MAX_FW_DATA];
};
#ifdef __KERNEL__
/* board config */
struct pn544_nfc_platform_data {
int (*request_resources) (struct i2c_client *client);
void (*free_resources) (void);
void (*enable) (int fw);
int (*test) (void);
void (*disable) (void);
};
#endif /* __KERNEL__ */
#endif /* _PN544_H_ */