NFC: Driver for NXP Semiconductors PN544 NFC chip.

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>

1 files changed, 97 insertions, 0 deletions

diff --git a/include/linux/nfc/pn544.h b/include/linux/nfc/pn544.h
new file mode 100644
index 000000000000..7ab8521f2347
--- /dev/null
+++ b/include/linux/nfc/pn544.h
@@ -0,0 +1,97 @@
+/*
+ * 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_ */