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>
This commit is contained in:
Matti J. Aaltonen
Linus Torvalds
parent
6164281ab7
commit
0329326e85
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@ -0,0 +1,114 @@
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Kernel driver for the NXP Semiconductors PN544 Near Field
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Communication chip
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Author: Jari Vanhala
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Contact: Matti Aaltonen (matti.j.aaltonen at nokia.com)
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General
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-------
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The PN544 is an integrated transmission module for contactless
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communication. The driver goes under drives/nfc/ and is compiled as a
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module named "pn544". It registers a misc device and creates a device
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file named "/dev/pn544".
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Host Interfaces: I2C, SPI and HSU, this driver supports currently only I2C.
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The Interface
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-------------
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The driver offers a sysfs interface for a hardware test and an IOCTL
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interface for selecting between two operating modes. There are read,
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write and poll functions for transferring messages. The two operating
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modes are the normal (HCI) mode and the firmware update mode.
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PN544 is controlled by sending messages from the userspace to the
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chip. The main function of the driver is just to pass those messages
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without caring about the message content.
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Protocols
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---------
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In the normal (HCI) mode and in the firmware update mode read and
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write functions behave a bit differently because the message formats
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or the protocols are different.
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In the normal (HCI) mode the protocol used is derived from the ETSI
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HCI specification. The firmware is updated using a specific protocol,
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which is different from HCI.
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HCI messages consist of an eight bit header and the message body. The
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header contains the message length. Maximum size for an HCI message is
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33. In HCI mode sent messages are tested for a correct
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checksum. Firmware update messages have the length in the second (MSB)
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and third (LSB) bytes of the message. The maximum FW message length is
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1024 bytes.
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For the ETSI HCI specification see
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http://www.etsi.org/WebSite/Technologies/ProtocolSpecification.aspx
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The Hardware Test
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-----------------
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The idea of the test is that it can performed by reading from the
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corresponding sysfs file. The test is implemented in the board file
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and it should test that PN544 can be put into the firmware update
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mode. If the test is not implemented the sysfs file does not get
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created.
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Example:
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> cat /sys/module/pn544/drivers/i2c\:pn544/3-002b/nfc_test
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1
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Normal Operation
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----------------
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PN544 is powered up when the device file is opened, otherwise it's
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turned off. Only one instance can use the device at a time.
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Userspace applications control PN544 with HCI messages. The hardware
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sends an interrupt when data is available for reading. Data is
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physically read when the read function is called by a userspace
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application. Poll() checks the read interrupt state. Configuration and
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self testing are also done from the userspace using read and write.
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Example platform data:
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static int rx71_pn544_nfc_request_resources(struct i2c_client *client)
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{
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/* Get and setup the HW resources for the device */
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}
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static void rx71_pn544_nfc_free_resources(void)
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{
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/* Release the HW resources */
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}
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static void rx71_pn544_nfc_enable(int fw)
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{
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/* Turn the device on */
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}
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static int rx71_pn544_nfc_test(void)
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{
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/*
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* Put the device into the FW update mode
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* and then back to the normal mode.
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* Check the behavior and return one on success,
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* zero on failure.
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*/
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}
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static void rx71_pn544_nfc_disable(void)
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{
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/* turn the power off */
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}
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static struct pn544_nfc_platform_data rx71_nfc_data = {
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.request_resources = rx71_pn544_nfc_request_resources,
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.free_resources = rx71_pn544_nfc_free_resources,
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.enable = rx71_pn544_nfc_enable,
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.test = rx71_pn544_nfc_test,
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.disable = rx71_pn544_nfc_disable,
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};
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@ -88,6 +88,8 @@ source "drivers/memstick/Kconfig"
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source "drivers/leds/Kconfig"
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source "drivers/nfc/Kconfig"
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source "drivers/accessibility/Kconfig"
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source "drivers/infiniband/Kconfig"
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@ -40,7 +40,7 @@ obj-$(CONFIG_FB_INTEL) += video/intelfb/
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obj-y += serial/
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obj-$(CONFIG_PARPORT) += parport/
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obj-y += base/ block/ misc/ mfd/
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obj-y += base/ block/ misc/ mfd/ nfc/
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obj-$(CONFIG_NUBUS) += nubus/
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obj-y += macintosh/
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obj-$(CONFIG_IDE) += ide/
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#
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# Near Field Communication (NFC) devices
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#
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menuconfig NFC_DEVICES
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bool "NFC devices"
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default n
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---help---
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You'll have to say Y if your computer contains an NFC device that
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you want to use under Linux.
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You can say N here if you don't have any Near Field Communication
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devices connected to your computer.
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if NFC_DEVICES
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config PN544_NFC
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tristate "PN544 NFC driver"
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depends on I2C
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select CRC_CCITT
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default n
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---help---
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Say yes if you want PN544 Near Field Communication driver.
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This is for i2c connected version. If unsure, say N here.
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To compile this driver as a module, choose m here. The module will
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be called pn544.
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endif # NFC_DEVICES
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@ -0,0 +1,5 @@
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#
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# Makefile for nfc devices
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#
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obj-$(CONFIG_PN544_NFC) += pn544.o
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@ -0,0 +1,891 @@
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/*
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* Driver for the PN544 NFC chip.
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*
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* Copyright (C) Nokia Corporation
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*
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* Author: Jari Vanhala <ext-jari.vanhala@nokia.com>
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* Contact: Matti Aaltonen <matti.j.aaltonen@nokia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/completion.h>
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#include <linux/crc-ccitt.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/miscdevice.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/nfc/pn544.h>
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#include <linux/poll.h>
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#include <linux/regulator/consumer.h>
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#include <linux/serial_core.h> /* for TCGETS */
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#include <linux/slab.h>
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#define DRIVER_CARD "PN544 NFC"
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#define DRIVER_DESC "NFC driver for PN544"
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static struct i2c_device_id pn544_id_table[] = {
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{ PN544_DRIVER_NAME, 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, pn544_id_table);
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#define HCI_MODE 0
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#define FW_MODE 1
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enum pn544_state {
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PN544_ST_COLD,
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PN544_ST_FW_READY,
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PN544_ST_READY,
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};
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enum pn544_irq {
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PN544_NONE,
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PN544_INT,
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};
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struct pn544_info {
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struct miscdevice miscdev;
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struct i2c_client *i2c_dev;
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struct regulator_bulk_data regs[2];
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enum pn544_state state;
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wait_queue_head_t read_wait;
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loff_t read_offset;
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enum pn544_irq read_irq;
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struct mutex read_mutex; /* Serialize read_irq access */
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struct mutex mutex; /* Serialize info struct access */
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u8 *buf;
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unsigned int buflen;
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};
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static const char reg_vdd_io[] = "Vdd_IO";
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static const char reg_vbat[] = "VBat";
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/* sysfs interface */
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static ssize_t pn544_test(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct pn544_info *info = dev_get_drvdata(dev);
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struct i2c_client *client = info->i2c_dev;
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struct pn544_nfc_platform_data *pdata = client->dev.platform_data;
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return snprintf(buf, PAGE_SIZE, "%d\n", pdata->test());
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}
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static int pn544_enable(struct pn544_info *info, int mode)
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{
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struct pn544_nfc_platform_data *pdata;
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struct i2c_client *client = info->i2c_dev;
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int r;
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r = regulator_bulk_enable(ARRAY_SIZE(info->regs), info->regs);
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if (r < 0)
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return r;
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pdata = client->dev.platform_data;
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info->read_irq = PN544_NONE;
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if (pdata->enable)
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pdata->enable(mode);
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if (mode) {
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info->state = PN544_ST_FW_READY;
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dev_dbg(&client->dev, "now in FW-mode\n");
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} else {
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info->state = PN544_ST_READY;
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dev_dbg(&client->dev, "now in HCI-mode\n");
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}
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usleep_range(10000, 15000);
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return 0;
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}
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static void pn544_disable(struct pn544_info *info)
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{
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struct pn544_nfc_platform_data *pdata;
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struct i2c_client *client = info->i2c_dev;
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pdata = client->dev.platform_data;
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if (pdata->disable)
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pdata->disable();
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info->state = PN544_ST_COLD;
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dev_dbg(&client->dev, "Now in OFF-mode\n");
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msleep(PN544_RESETVEN_TIME);
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info->read_irq = PN544_NONE;
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regulator_bulk_disable(ARRAY_SIZE(info->regs), info->regs);
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}
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static int check_crc(u8 *buf, int buflen)
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{
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u8 len;
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u16 crc;
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len = buf[0] + 1;
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if (len < 4 || len != buflen || len > PN544_MSG_MAX_SIZE) {
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pr_err(PN544_DRIVER_NAME
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": CRC; corrupt packet len %u (%d)\n", len, buflen);
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print_hex_dump(KERN_DEBUG, "crc: ", DUMP_PREFIX_NONE,
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16, 2, buf, buflen, false);
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return -EPERM;
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}
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crc = crc_ccitt(0xffff, buf, len - 2);
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crc = ~crc;
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if (buf[len-2] != (crc & 0xff) || buf[len-1] != (crc >> 8)) {
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pr_err(PN544_DRIVER_NAME ": CRC error 0x%x != 0x%x 0x%x\n",
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crc, buf[len-1], buf[len-2]);
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print_hex_dump(KERN_DEBUG, "crc: ", DUMP_PREFIX_NONE,
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16, 2, buf, buflen, false);
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return -EPERM;
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}
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return 0;
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}
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static int pn544_i2c_write(struct i2c_client *client, u8 *buf, int len)
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{
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int r;
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if (len < 4 || len != (buf[0] + 1)) {
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dev_err(&client->dev, "%s: Illegal message length: %d\n",
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__func__, len);
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return -EINVAL;
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}
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if (check_crc(buf, len))
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return -EINVAL;
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usleep_range(3000, 6000);
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r = i2c_master_send(client, buf, len);
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dev_dbg(&client->dev, "send: %d\n", r);
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if (r == -EREMOTEIO) { /* Retry, chip was in standby */
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usleep_range(6000, 10000);
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r = i2c_master_send(client, buf, len);
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dev_dbg(&client->dev, "send2: %d\n", r);
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}
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if (r != len)
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return -EREMOTEIO;
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return r;
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}
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static int pn544_i2c_read(struct i2c_client *client, u8 *buf, int buflen)
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{
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int r;
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u8 len;
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/*
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* You could read a packet in one go, but then you'd need to read
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* max size and rest would be 0xff fill, so we do split reads.
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*/
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r = i2c_master_recv(client, &len, 1);
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dev_dbg(&client->dev, "recv1: %d\n", r);
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if (r != 1)
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return -EREMOTEIO;
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if (len < PN544_LLC_HCI_OVERHEAD)
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len = PN544_LLC_HCI_OVERHEAD;
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else if (len > (PN544_MSG_MAX_SIZE - 1))
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len = PN544_MSG_MAX_SIZE - 1;
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if (1 + len > buflen) /* len+(data+crc16) */
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return -EMSGSIZE;
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buf[0] = len;
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r = i2c_master_recv(client, buf + 1, len);
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dev_dbg(&client->dev, "recv2: %d\n", r);
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if (r != len)
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return -EREMOTEIO;
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usleep_range(3000, 6000);
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return r + 1;
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}
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static int pn544_fw_write(struct i2c_client *client, u8 *buf, int len)
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{
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int r;
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dev_dbg(&client->dev, "%s\n", __func__);
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if (len < PN544_FW_HEADER_SIZE ||
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(PN544_FW_HEADER_SIZE + (buf[1] << 8) + buf[2]) != len)
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return -EINVAL;
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r = i2c_master_send(client, buf, len);
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dev_dbg(&client->dev, "fw send: %d\n", r);
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if (r == -EREMOTEIO) { /* Retry, chip was in standby */
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usleep_range(6000, 10000);
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r = i2c_master_send(client, buf, len);
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dev_dbg(&client->dev, "fw send2: %d\n", r);
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}
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if (r != len)
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return -EREMOTEIO;
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return r;
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}
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static int pn544_fw_read(struct i2c_client *client, u8 *buf, int buflen)
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{
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int r, len;
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if (buflen < PN544_FW_HEADER_SIZE)
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return -EINVAL;
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r = i2c_master_recv(client, buf, PN544_FW_HEADER_SIZE);
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dev_dbg(&client->dev, "FW recv1: %d\n", r);
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if (r < 0)
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return r;
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if (r < PN544_FW_HEADER_SIZE)
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return -EINVAL;
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len = (buf[1] << 8) + buf[2];
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if (len == 0) /* just header, no additional data */
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return r;
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if (len > buflen - PN544_FW_HEADER_SIZE)
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return -EMSGSIZE;
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r = i2c_master_recv(client, buf + PN544_FW_HEADER_SIZE, len);
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dev_dbg(&client->dev, "fw recv2: %d\n", r);
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if (r != len)
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return -EINVAL;
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return r + PN544_FW_HEADER_SIZE;
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}
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static irqreturn_t pn544_irq_thread_fn(int irq, void *dev_id)
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{
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struct pn544_info *info = dev_id;
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struct i2c_client *client = info->i2c_dev;
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BUG_ON(!info);
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BUG_ON(irq != info->i2c_dev->irq);
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dev_dbg(&client->dev, "IRQ\n");
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mutex_lock(&info->read_mutex);
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info->read_irq = PN544_INT;
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mutex_unlock(&info->read_mutex);
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wake_up_interruptible(&info->read_wait);
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return IRQ_HANDLED;
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}
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static enum pn544_irq pn544_irq_state(struct pn544_info *info)
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{
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enum pn544_irq irq;
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mutex_lock(&info->read_mutex);
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irq = info->read_irq;
|
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mutex_unlock(&info->read_mutex);
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/*
|
||||
* XXX: should we check GPIO-line status directly?
|
||||
* return pdata->irq_status() ? PN544_INT : PN544_NONE;
|
||||
*/
|
||||
|
||||
return irq;
|
||||
}
|
||||
|
||||
static ssize_t pn544_read(struct file *file, char __user *buf,
|
||||
size_t count, loff_t *offset)
|
||||
{
|
||||
struct pn544_info *info = container_of(file->private_data,
|
||||
struct pn544_info, miscdev);
|
||||
struct i2c_client *client = info->i2c_dev;
|
||||
enum pn544_irq irq;
|
||||
size_t len;
|
||||
int r = 0;
|
||||
|
||||
dev_dbg(&client->dev, "%s: info: %p, count: %zu\n", __func__,
|
||||
info, count);
|
||||
|
||||
mutex_lock(&info->mutex);
|
||||
|
||||
if (info->state == PN544_ST_COLD) {
|
||||
r = -ENODEV;
|
||||
goto out;
|
||||
}
|
||||
|
||||
irq = pn544_irq_state(info);
|
||||
if (irq == PN544_NONE) {
|
||||
if (file->f_flags & O_NONBLOCK) {
|
||||
r = -EAGAIN;
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (wait_event_interruptible(info->read_wait,
|
||||
(info->read_irq == PN544_INT))) {
|
||||
r = -ERESTARTSYS;
|
||||
goto out;
|
||||
}
|
||||
}
|
||||
|
||||
if (info->state == PN544_ST_FW_READY) {
|
||||
len = min(count, info->buflen);
|
||||
|
||||
mutex_lock(&info->read_mutex);
|
||||
r = pn544_fw_read(info->i2c_dev, info->buf, len);
|
||||
info->read_irq = PN544_NONE;
|
||||
mutex_unlock(&info->read_mutex);
|
||||
|
||||
if (r < 0) {
|
||||
dev_err(&info->i2c_dev->dev, "FW read failed: %d\n", r);
|
||||
goto out;
|
||||
}
|
||||
|
||||
print_hex_dump(KERN_DEBUG, "FW read: ", DUMP_PREFIX_NONE,
|
||||
16, 2, info->buf, r, false);
|
||||
|
||||
*offset += r;
|
||||
if (copy_to_user(buf, info->buf, r)) {
|
||||
r = -EFAULT;
|
||||
goto out;
|
||||
}
|
||||
} else {
|
||||
len = min(count, info->buflen);
|
||||
|
||||
mutex_lock(&info->read_mutex);
|
||||
r = pn544_i2c_read(info->i2c_dev, info->buf, len);
|
||||
info->read_irq = PN544_NONE;
|
||||
mutex_unlock(&info->read_mutex);
|
||||
|
||||
if (r < 0) {
|
||||
dev_err(&info->i2c_dev->dev, "read failed (%d)\n", r);
|
||||
goto out;
|
||||
}
|
||||
print_hex_dump(KERN_DEBUG, "read: ", DUMP_PREFIX_NONE,
|
||||
16, 2, info->buf, r, false);
|
||||
|
||||
*offset += r;
|
||||
if (copy_to_user(buf, info->buf, r)) {
|
||||
r = -EFAULT;
|
||||
goto out;
|
||||
}
|
||||
}
|
||||
|
||||
out:
|
||||
mutex_unlock(&info->mutex);
|
||||
|
||||
return r;
|
||||
}
|
||||
|
||||
static unsigned int pn544_poll(struct file *file, poll_table *wait)
|
||||
{
|
||||
struct pn544_info *info = container_of(file->private_data,
|
||||
struct pn544_info, miscdev);
|
||||
struct i2c_client *client = info->i2c_dev;
|
||||
int r = 0;
|
||||
|
||||
dev_dbg(&client->dev, "%s: info: %p\n", __func__, info);
|
||||
|
||||
mutex_lock(&info->mutex);
|
||||
|
||||
if (info->state == PN544_ST_COLD) {
|
||||
r = -ENODEV;
|
||||
goto out;
|
||||
}
|
||||
|
||||
poll_wait(file, &info->read_wait, wait);
|
||||
|
||||
if (pn544_irq_state(info) == PN544_INT) {
|
||||
r = POLLIN | POLLRDNORM;
|
||||
goto out;
|
||||
}
|
||||
out:
|
||||
mutex_unlock(&info->mutex);
|
||||
|
||||
return r;
|
||||
}
|
||||
|
||||
static ssize_t pn544_write(struct file *file, const char __user *buf,
|
||||
size_t count, loff_t *ppos)
|
||||
{
|
||||
struct pn544_info *info = container_of(file->private_data,
|
||||
struct pn544_info, miscdev);
|
||||
struct i2c_client *client = info->i2c_dev;
|
||||
ssize_t len;
|
||||
int r;
|
||||
|
||||
dev_dbg(&client->dev, "%s: info: %p, count %zu\n", __func__,
|
||||
info, count);
|
||||
|
||||
mutex_lock(&info->mutex);
|
||||
|
||||
if (info->state == PN544_ST_COLD) {
|
||||
r = -ENODEV;
|
||||
goto out;
|
||||
}
|
||||
|
||||
/*
|
||||
* XXX: should we detect rset-writes and clean possible
|
||||
* read_irq state
|
||||
*/
|
||||
if (info->state == PN544_ST_FW_READY) {
|
||||
size_t fw_len;
|
||||
|
||||
if (count < PN544_FW_HEADER_SIZE) {
|
||||
r = -EINVAL;
|
||||
goto out;
|
||||
}
|
||||
|
||||
len = min(count, info->buflen);
|
||||
if (copy_from_user(info->buf, buf, len)) {
|
||||
r = -EFAULT;
|
||||
goto out;
|
||||
}
|
||||
|
||||
print_hex_dump(KERN_DEBUG, "FW write: ", DUMP_PREFIX_NONE,
|
||||
16, 2, info->buf, len, false);
|
||||
|
||||
fw_len = PN544_FW_HEADER_SIZE + (info->buf[1] << 8) +
|
||||
info->buf[2];
|
||||
|
||||
if (len > fw_len) /* 1 msg at a time */
|
||||
len = fw_len;
|
||||
|
||||
r = pn544_fw_write(info->i2c_dev, info->buf, len);
|
||||
} else {
|
||||
if (count < PN544_LLC_MIN_SIZE) {
|
||||
r = -EINVAL;
|
||||
goto out;
|
||||
}
|
||||
|
||||
len = min(count, info->buflen);
|
||||
if (copy_from_user(info->buf, buf, len)) {
|
||||
r = -EFAULT;
|
||||
goto out;
|
||||
}
|
||||
|
||||
print_hex_dump(KERN_DEBUG, "write: ", DUMP_PREFIX_NONE,
|
||||
16, 2, info->buf, len, false);
|
||||
|
||||
if (len > (info->buf[0] + 1)) /* 1 msg at a time */
|
||||
len = info->buf[0] + 1;
|
||||
|
||||
r = pn544_i2c_write(info->i2c_dev, info->buf, len);
|
||||
}
|
||||
out:
|
||||
mutex_unlock(&info->mutex);
|
||||
|
||||
return r;
|
||||
|
||||
}
|
||||
|
||||
static long pn544_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
||||
{
|
||||
struct pn544_info *info = container_of(file->private_data,
|
||||
struct pn544_info, miscdev);
|
||||
struct i2c_client *client = info->i2c_dev;
|
||||
struct pn544_nfc_platform_data *pdata;
|
||||
unsigned int val;
|
||||
int r = 0;
|
||||
|
||||
dev_dbg(&client->dev, "%s: info: %p, cmd: 0x%x\n", __func__, info, cmd);
|
||||
|
||||
mutex_lock(&info->mutex);
|
||||
|
||||
if (info->state == PN544_ST_COLD) {
|
||||
r = -ENODEV;
|
||||
goto out;
|
||||
}
|
||||
|
||||
pdata = info->i2c_dev->dev.platform_data;
|
||||
switch (cmd) {
|
||||
case PN544_GET_FW_MODE:
|
||||
dev_dbg(&client->dev, "%s: PN544_GET_FW_MODE\n", __func__);
|
||||
|
||||
val = (info->state == PN544_ST_FW_READY);
|
||||
if (copy_to_user((void __user *)arg, &val, sizeof(val))) {
|
||||
r = -EFAULT;
|
||||
goto out;
|
||||
}
|
||||
|
||||
break;
|
||||
|
||||
case PN544_SET_FW_MODE:
|
||||
dev_dbg(&client->dev, "%s: PN544_SET_FW_MODE\n", __func__);
|
||||
|
||||
if (copy_from_user(&val, (void __user *)arg, sizeof(val))) {
|
||||
r = -EFAULT;
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (val) {
|
||||
if (info->state == PN544_ST_FW_READY)
|
||||
break;
|
||||
|
||||
pn544_disable(info);
|
||||
r = pn544_enable(info, FW_MODE);
|
||||
if (r < 0)
|
||||
goto out;
|
||||
} else {
|
||||
if (info->state == PN544_ST_READY)
|
||||
break;
|
||||
pn544_disable(info);
|
||||
r = pn544_enable(info, HCI_MODE);
|
||||
if (r < 0)
|
||||
goto out;
|
||||
}
|
||||
file->f_pos = info->read_offset;
|
||||
break;
|
||||
|
||||
case TCGETS:
|
||||
dev_dbg(&client->dev, "%s: TCGETS\n", __func__);
|
||||
|
||||
r = -ENOIOCTLCMD;
|
||||
break;
|
||||
|
||||
default:
|
||||
dev_err(&client->dev, "Unknown ioctl 0x%x\n", cmd);
|
||||
r = -ENOIOCTLCMD;
|
||||
break;
|
||||
}
|
||||
|
||||
out:
|
||||
mutex_unlock(&info->mutex);
|
||||
|
||||
return r;
|
||||
}
|
||||
|
||||
static int pn544_open(struct inode *inode, struct file *file)
|
||||
{
|
||||
struct pn544_info *info = container_of(file->private_data,
|
||||
struct pn544_info, miscdev);
|
||||
struct i2c_client *client = info->i2c_dev;
|
||||
int r = 0;
|
||||
|
||||
dev_dbg(&client->dev, "%s: info: %p, client %p\n", __func__,
|
||||
info, info->i2c_dev);
|
||||
|
||||
mutex_lock(&info->mutex);
|
||||
|
||||
/*
|
||||
* Only 1 at a time.
|
||||
* XXX: maybe user (counter) would work better
|
||||
*/
|
||||
if (info->state != PN544_ST_COLD) {
|
||||
r = -EBUSY;
|
||||
goto out;
|
||||
}
|
||||
|
||||
file->f_pos = info->read_offset;
|
||||
r = pn544_enable(info, HCI_MODE);
|
||||
|
||||
out:
|
||||
mutex_unlock(&info->mutex);
|
||||
return r;
|
||||
}
|
||||
|
||||
static int pn544_close(struct inode *inode, struct file *file)
|
||||
{
|
||||
struct pn544_info *info = container_of(file->private_data,
|
||||
struct pn544_info, miscdev);
|
||||
struct i2c_client *client = info->i2c_dev;
|
||||
|
||||
dev_dbg(&client->dev, "%s: info: %p, client %p\n",
|
||||
__func__, info, info->i2c_dev);
|
||||
|
||||
mutex_lock(&info->mutex);
|
||||
pn544_disable(info);
|
||||
mutex_unlock(&info->mutex);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct file_operations pn544_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.llseek = no_llseek,
|
||||
.read = pn544_read,
|
||||
.write = pn544_write,
|
||||
.poll = pn544_poll,
|
||||
.open = pn544_open,
|
||||
.release = pn544_close,
|
||||
.unlocked_ioctl = pn544_ioctl,
|
||||
};
|
||||
|
||||
#ifdef CONFIG_PM
|
||||
static int pn544_suspend(struct device *dev)
|
||||
{
|
||||
struct i2c_client *client = to_i2c_client(dev);
|
||||
struct pn544_info *info;
|
||||
int r = 0;
|
||||
|
||||
dev_info(&client->dev, "***\n%s: client %p\n***\n", __func__, client);
|
||||
|
||||
info = i2c_get_clientdata(client);
|
||||
dev_info(&client->dev, "%s: info: %p, client %p\n", __func__,
|
||||
info, client);
|
||||
|
||||
mutex_lock(&info->mutex);
|
||||
|
||||
switch (info->state) {
|
||||
case PN544_ST_FW_READY:
|
||||
/* Do not suspend while upgrading FW, please! */
|
||||
r = -EPERM;
|
||||
break;
|
||||
|
||||
case PN544_ST_READY:
|
||||
/*
|
||||
* CHECK: Device should be in standby-mode. No way to check?
|
||||
* Allowing low power mode for the regulator is potentially
|
||||
* dangerous if pn544 does not go to suspension.
|
||||
*/
|
||||
break;
|
||||
|
||||
case PN544_ST_COLD:
|
||||
break;
|
||||
};
|
||||
|
||||
mutex_unlock(&info->mutex);
|
||||
return r;
|
||||
}
|
||||
|
||||
static int pn544_resume(struct device *dev)
|
||||
{
|
||||
struct i2c_client *client = to_i2c_client(dev);
|
||||
struct pn544_info *info = i2c_get_clientdata(client);
|
||||
int r = 0;
|
||||
|
||||
dev_dbg(&client->dev, "%s: info: %p, client %p\n", __func__,
|
||||
info, client);
|
||||
|
||||
mutex_lock(&info->mutex);
|
||||
|
||||
switch (info->state) {
|
||||
case PN544_ST_READY:
|
||||
/*
|
||||
* CHECK: If regulator low power mode is allowed in
|
||||
* pn544_suspend, we should go back to normal mode
|
||||
* here.
|
||||
*/
|
||||
break;
|
||||
|
||||
case PN544_ST_COLD:
|
||||
break;
|
||||
|
||||
case PN544_ST_FW_READY:
|
||||
break;
|
||||
};
|
||||
|
||||
mutex_unlock(&info->mutex);
|
||||
|
||||
return r;
|
||||
}
|
||||
|
||||
static SIMPLE_DEV_PM_OPS(pn544_pm_ops, pn544_suspend, pn544_resume);
|
||||
#endif
|
||||
|
||||
static struct device_attribute pn544_attr =
|
||||
__ATTR(nfc_test, S_IRUGO, pn544_test, NULL);
|
||||
|
||||
static int __devinit pn544_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
struct pn544_info *info;
|
||||
struct pn544_nfc_platform_data *pdata;
|
||||
int r = 0;
|
||||
|
||||
dev_dbg(&client->dev, "%s\n", __func__);
|
||||
dev_dbg(&client->dev, "IRQ: %d\n", client->irq);
|
||||
|
||||
/* private data allocation */
|
||||
info = kzalloc(sizeof(struct pn544_info), GFP_KERNEL);
|
||||
if (!info) {
|
||||
dev_err(&client->dev,
|
||||
"Cannot allocate memory for pn544_info.\n");
|
||||
r = -ENOMEM;
|
||||
goto err_info_alloc;
|
||||
}
|
||||
|
||||
info->buflen = max(PN544_MSG_MAX_SIZE, PN544_MAX_I2C_TRANSFER);
|
||||
info->buf = kzalloc(info->buflen, GFP_KERNEL);
|
||||
if (!info->buf) {
|
||||
dev_err(&client->dev,
|
||||
"Cannot allocate memory for pn544_info->buf.\n");
|
||||
r = -ENOMEM;
|
||||
goto err_buf_alloc;
|
||||
}
|
||||
|
||||
info->regs[0].supply = reg_vdd_io;
|
||||
info->regs[1].supply = reg_vbat;
|
||||
r = regulator_bulk_get(&client->dev, ARRAY_SIZE(info->regs),
|
||||
info->regs);
|
||||
if (r < 0)
|
||||
goto err_kmalloc;
|
||||
|
||||
info->i2c_dev = client;
|
||||
info->state = PN544_ST_COLD;
|
||||
info->read_irq = PN544_NONE;
|
||||
mutex_init(&info->read_mutex);
|
||||
mutex_init(&info->mutex);
|
||||
init_waitqueue_head(&info->read_wait);
|
||||
i2c_set_clientdata(client, info);
|
||||
pdata = client->dev.platform_data;
|
||||
if (!pdata) {
|
||||
dev_err(&client->dev, "No platform data\n");
|
||||
r = -EINVAL;
|
||||
goto err_reg;
|
||||
}
|
||||
|
||||
if (!pdata->request_resources) {
|
||||
dev_err(&client->dev, "request_resources() missing\n");
|
||||
r = -EINVAL;
|
||||
goto err_reg;
|
||||
}
|
||||
|
||||
r = pdata->request_resources(client);
|
||||
if (r) {
|
||||
dev_err(&client->dev, "Cannot get platform resources\n");
|
||||
goto err_reg;
|
||||
}
|
||||
|
||||
r = request_threaded_irq(client->irq, NULL, pn544_irq_thread_fn,
|
||||
IRQF_TRIGGER_RISING, PN544_DRIVER_NAME,
|
||||
info);
|
||||
if (r < 0) {
|
||||
dev_err(&client->dev, "Unable to register IRQ handler\n");
|
||||
goto err_res;
|
||||
}
|
||||
|
||||
/* If we don't have the test we don't need the sysfs file */
|
||||
if (pdata->test) {
|
||||
r = device_create_file(&client->dev, &pn544_attr);
|
||||
if (r) {
|
||||
dev_err(&client->dev,
|
||||
"sysfs registration failed, error %d\n", r);
|
||||
goto err_irq;
|
||||
}
|
||||
}
|
||||
|
||||
info->miscdev.minor = MISC_DYNAMIC_MINOR;
|
||||
info->miscdev.name = PN544_DRIVER_NAME;
|
||||
info->miscdev.fops = &pn544_fops;
|
||||
info->miscdev.parent = &client->dev;
|
||||
r = misc_register(&info->miscdev);
|
||||
if (r < 0) {
|
||||
dev_err(&client->dev, "Device registration failed\n");
|
||||
goto err_sysfs;
|
||||
}
|
||||
|
||||
dev_dbg(&client->dev, "%s: info: %p, pdata %p, client %p\n",
|
||||
__func__, info, pdata, client);
|
||||
|
||||
return 0;
|
||||
|
||||
err_sysfs:
|
||||
if (pdata->test)
|
||||
device_remove_file(&client->dev, &pn544_attr);
|
||||
err_irq:
|
||||
free_irq(client->irq, info);
|
||||
err_res:
|
||||
if (pdata->free_resources)
|
||||
pdata->free_resources();
|
||||
err_reg:
|
||||
regulator_bulk_free(ARRAY_SIZE(info->regs), info->regs);
|
||||
err_kmalloc:
|
||||
kfree(info->buf);
|
||||
err_buf_alloc:
|
||||
kfree(info);
|
||||
err_info_alloc:
|
||||
return r;
|
||||
}
|
||||
|
||||
static __devexit int pn544_remove(struct i2c_client *client)
|
||||
{
|
||||
struct pn544_info *info = i2c_get_clientdata(client);
|
||||
struct pn544_nfc_platform_data *pdata = client->dev.platform_data;
|
||||
|
||||
dev_dbg(&client->dev, "%s\n", __func__);
|
||||
|
||||
misc_deregister(&info->miscdev);
|
||||
if (pdata->test)
|
||||
device_remove_file(&client->dev, &pn544_attr);
|
||||
|
||||
if (info->state != PN544_ST_COLD) {
|
||||
if (pdata->disable)
|
||||
pdata->disable();
|
||||
|
||||
info->read_irq = PN544_NONE;
|
||||
}
|
||||
|
||||
free_irq(client->irq, info);
|
||||
if (pdata->free_resources)
|
||||
pdata->free_resources();
|
||||
|
||||
regulator_bulk_free(ARRAY_SIZE(info->regs), info->regs);
|
||||
kfree(info->buf);
|
||||
kfree(info);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct i2c_driver pn544_driver = {
|
||||
.driver = {
|
||||
.name = PN544_DRIVER_NAME,
|
||||
#ifdef CONFIG_PM
|
||||
.pm = &pn544_pm_ops,
|
||||
#endif
|
||||
},
|
||||
.probe = pn544_probe,
|
||||
.id_table = pn544_id_table,
|
||||
.remove = __devexit_p(pn544_remove),
|
||||
};
|
||||
|
||||
static int __init pn544_init(void)
|
||||
{
|
||||
int r;
|
||||
|
||||
pr_debug(DRIVER_DESC ": %s\n", __func__);
|
||||
|
||||
r = i2c_add_driver(&pn544_driver);
|
||||
if (r) {
|
||||
pr_err(PN544_DRIVER_NAME ": driver registration failed\n");
|
||||
return r;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void __exit pn544_exit(void)
|
||||
{
|
||||
i2c_del_driver(&pn544_driver);
|
||||
pr_info(DRIVER_DESC ", Exiting.\n");
|
||||
}
|
||||
|
||||
module_init(pn544_init);
|
||||
module_exit(pn544_exit);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_DESCRIPTION(DRIVER_DESC);
|
||||
|
|
@ -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_ */
|
||||
Loading…
Reference in New Issue