NFC: HCI based pn544 driver
This is an NFC driver for NXP pn544. Unlike pn544.c, this one is based on the NFC HCI and SHDLC kernel layers. Signed-off-by: Eric Lapuyade <eric.lapuyade@intel.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Eric Lapuyade
John W. Linville
Родитель
e5fe4cf8ee
Коммит
bbed0deefb
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@ -17,6 +17,19 @@ config PN544_NFC
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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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config PN544_HCI_NFC
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tristate "HCI PN544 NFC driver"
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depends on I2C && NFC_SHDLC
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select CRC_CCITT
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default n
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---help---
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NXP PN544 i2c driver.
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This is a driver based on the SHDLC and HCI NFC kernel layers and
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will thus not work with NXP libnfc library.
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To compile this driver as a module, choose m here. The module will
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be called pn544_hci.
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config NFC_PN533
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tristate "NXP PN533 USB driver"
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depends on USB
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@ -3,6 +3,7 @@
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#
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obj-$(CONFIG_PN544_NFC) += pn544.o
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obj-$(CONFIG_PN544_HCI_NFC) += pn544_hci.o
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obj-$(CONFIG_NFC_PN533) += pn533.o
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obj-$(CONFIG_NFC_WILINK) += nfcwilink.o
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@ -0,0 +1,947 @@
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/*
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* HCI based Driver for NXP PN544 NFC Chip
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*
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* Copyright (C) 2012 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions 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
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* Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <linux/crc-ccitt.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/miscdevice.h>
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#include <linux/interrupt.h>
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#include <linux/gpio.h>
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#include <linux/i2c.h>
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#include <linux/nfc.h>
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#include <net/nfc/hci.h>
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#include <net/nfc/shdlc.h>
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#include <linux/nfc/pn544.h>
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#define DRIVER_DESC "HCI NFC driver for PN544"
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#define PN544_HCI_DRIVER_NAME "pn544_hci"
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/* Timing restrictions (ms) */
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#define PN544_HCI_RESETVEN_TIME 30
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static struct i2c_device_id pn544_hci_id_table[] = {
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{"pn544", 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, pn544_hci_id_table);
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#define HCI_MODE 0
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#define FW_MODE 1
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/* framing in HCI mode */
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#define PN544_HCI_LLC_LEN 1
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#define PN544_HCI_LLC_CRC 2
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#define PN544_HCI_LLC_LEN_CRC (PN544_HCI_LLC_LEN + PN544_HCI_LLC_CRC)
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#define PN544_HCI_LLC_MIN_SIZE (1 + PN544_HCI_LLC_LEN_CRC)
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#define PN544_HCI_LLC_MAX_PAYLOAD 29
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#define PN544_HCI_LLC_MAX_SIZE (PN544_HCI_LLC_LEN_CRC + 1 + \
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PN544_HCI_LLC_MAX_PAYLOAD)
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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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#define FULL_VERSION_LEN 11
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/* Proprietary commands */
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#define PN544_WRITE 0x3f
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/* Proprietary gates, events, commands and registers */
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/* NFC_HCI_RF_READER_A_GATE additional registers and commands */
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#define PN544_RF_READER_A_AUTO_ACTIVATION 0x10
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#define PN544_RF_READER_A_CMD_CONTINUE_ACTIVATION 0x12
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#define PN544_MIFARE_CMD 0x21
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/* Commands that apply to all RF readers */
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#define PN544_RF_READER_CMD_PRESENCE_CHECK 0x30
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#define PN544_RF_READER_CMD_ACTIVATE_NEXT 0x32
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/* NFC_HCI_ID_MGMT_GATE additional registers */
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#define PN544_ID_MGMT_FULL_VERSION_SW 0x10
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#define PN544_RF_READER_ISO15693_GATE 0x12
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#define PN544_RF_READER_F_GATE 0x14
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#define PN544_FELICA_ID 0x04
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#define PN544_FELICA_RAW 0x20
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#define PN544_RF_READER_JEWEL_GATE 0x15
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#define PN544_JEWEL_RAW_CMD 0x23
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#define PN544_RF_READER_NFCIP1_INITIATOR_GATE 0x30
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#define PN544_RF_READER_NFCIP1_TARGET_GATE 0x31
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#define PN544_SYS_MGMT_GATE 0x90
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#define PN544_SYS_MGMT_INFO_NOTIFICATION 0x02
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#define PN544_POLLING_LOOP_MGMT_GATE 0x94
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#define PN544_PL_RDPHASES 0x06
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#define PN544_PL_EMULATION 0x07
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#define PN544_PL_NFCT_DEACTIVATED 0x09
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#define PN544_SWP_MGMT_GATE 0xA0
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#define PN544_NFC_WI_MGMT_GATE 0xA1
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static u8 pn544_custom_gates[] = {
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PN544_SYS_MGMT_GATE,
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PN544_SWP_MGMT_GATE,
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PN544_POLLING_LOOP_MGMT_GATE,
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PN544_NFC_WI_MGMT_GATE,
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PN544_RF_READER_F_GATE,
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PN544_RF_READER_JEWEL_GATE,
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PN544_RF_READER_ISO15693_GATE,
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PN544_RF_READER_NFCIP1_INITIATOR_GATE,
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PN544_RF_READER_NFCIP1_TARGET_GATE
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};
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/* Largest headroom needed for outgoing custom commands */
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#define PN544_CMDS_HEADROOM 2
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struct pn544_hci_info {
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struct i2c_client *i2c_dev;
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struct nfc_shdlc *shdlc;
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enum pn544_state state;
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struct mutex info_lock;
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unsigned int gpio_en;
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unsigned int gpio_irq;
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unsigned int gpio_fw;
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unsigned int en_polarity;
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int hard_fault; /*
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* < 0 if hardware error occured (e.g. i2c err)
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* and prevents normal operation.
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*/
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};
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static void pn544_hci_platform_init(struct pn544_hci_info *info)
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{
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int polarity, retry, ret;
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char rset_cmd[] = { 0x05, 0xF9, 0x04, 0x00, 0xC3, 0xE5 };
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int count = sizeof(rset_cmd);
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pr_info(DRIVER_DESC ": %s\n", __func__);
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dev_info(&info->i2c_dev->dev, "Detecting nfc_en polarity\n");
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/* Disable fw download */
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gpio_set_value(info->gpio_fw, 0);
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for (polarity = 0; polarity < 2; polarity++) {
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info->en_polarity = polarity;
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retry = 3;
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while (retry--) {
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/* power off */
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gpio_set_value(info->gpio_en, !info->en_polarity);
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usleep_range(10000, 15000);
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/* power on */
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gpio_set_value(info->gpio_en, info->en_polarity);
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usleep_range(10000, 15000);
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/* send reset */
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dev_dbg(&info->i2c_dev->dev, "Sending reset cmd\n");
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ret = i2c_master_send(info->i2c_dev, rset_cmd, count);
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if (ret == count) {
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dev_info(&info->i2c_dev->dev,
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"nfc_en polarity : active %s\n",
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(polarity == 0 ? "low" : "high"));
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goto out;
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}
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}
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}
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dev_err(&info->i2c_dev->dev,
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"Could not detect nfc_en polarity, fallback to active high\n");
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out:
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gpio_set_value(info->gpio_en, !info->en_polarity);
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}
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static int pn544_hci_enable(struct pn544_hci_info *info, int mode)
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{
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pr_info(DRIVER_DESC ": %s\n", __func__);
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gpio_set_value(info->gpio_fw, 0);
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gpio_set_value(info->gpio_en, info->en_polarity);
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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_hci_disable(struct pn544_hci_info *info)
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{
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pr_info(DRIVER_DESC ": %s\n", __func__);
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gpio_set_value(info->gpio_fw, 0);
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gpio_set_value(info->gpio_en, !info->en_polarity);
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usleep_range(10000, 15000);
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gpio_set_value(info->gpio_en, info->en_polarity);
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usleep_range(10000, 15000);
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gpio_set_value(info->gpio_en, !info->en_polarity);
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usleep_range(10000, 15000);
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}
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static int pn544_hci_i2c_write(struct i2c_client *client, u8 *buf, int len)
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{
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int r;
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usleep_range(3000, 6000);
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r = i2c_master_send(client, buf, len);
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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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}
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if (r >= 0 && r != len)
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r = -EREMOTEIO;
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return r;
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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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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_HCI_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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pr_info(DRIVER_DESC ": %s : BAD CRC\n", __func__);
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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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/*
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* Reads an shdlc frame and returns it in a newly allocated sk_buff. Guarantees
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* that i2c bus will be flushed and that next read will start on a new frame.
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* returned skb contains only LLC header and payload.
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* returns:
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* -EREMOTEIO : i2c read error (fatal)
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* -EBADMSG : frame was incorrect and discarded
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* -ENOMEM : cannot allocate skb, frame dropped
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*/
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static int pn544_hci_i2c_read(struct i2c_client *client, struct sk_buff **skb)
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{
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int r;
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u8 len;
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u8 tmp[PN544_HCI_LLC_MAX_SIZE - 1];
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r = i2c_master_recv(client, &len, 1);
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if (r != 1) {
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dev_err(&client->dev, "cannot read len byte\n");
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return -EREMOTEIO;
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}
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if ((len < (PN544_HCI_LLC_MIN_SIZE - 1)) ||
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(len > (PN544_HCI_LLC_MAX_SIZE - 1))) {
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dev_err(&client->dev, "invalid len byte\n");
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r = -EBADMSG;
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goto flush;
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}
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*skb = alloc_skb(1 + len, GFP_KERNEL);
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if (*skb == NULL) {
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r = -ENOMEM;
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goto flush;
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}
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*skb_put(*skb, 1) = len;
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r = i2c_master_recv(client, skb_put(*skb, len), len);
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if (r != len) {
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kfree_skb(*skb);
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return -EREMOTEIO;
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}
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r = check_crc((*skb)->data, (*skb)->len);
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if (r != 0) {
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kfree_skb(*skb);
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r = -EBADMSG;
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goto flush;
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}
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skb_pull(*skb, 1);
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||||
skb_trim(*skb, (*skb)->len - 2);
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usleep_range(3000, 6000);
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return 0;
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flush:
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if (i2c_master_recv(client, tmp, sizeof(tmp)) < 0)
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r = -EREMOTEIO;
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usleep_range(3000, 6000);
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return r;
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}
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/*
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* Reads an shdlc frame from the chip. This is not as straightforward as it
|
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* seems. There are cases where we could loose the frame start synchronization.
|
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* The frame format is len-data-crc, and corruption can occur anywhere while
|
||||
* transiting on i2c bus, such that we could read an invalid len.
|
||||
* In order to recover synchronization with the next frame, we must be sure
|
||||
* to read the real amount of data without using the len byte. We do this by
|
||||
* assuming the following:
|
||||
* - the chip will always present only one single complete frame on the bus
|
||||
* before triggering the interrupt
|
||||
* - the chip will not present a new frame until we have completely read
|
||||
* the previous one (or until we have handled the interrupt).
|
||||
* The tricky case is when we read a corrupted len that is less than the real
|
||||
* len. We must detect this here in order to determine that we need to flush
|
||||
* the bus. This is the reason why we check the crc here.
|
||||
*/
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static irqreturn_t pn544_hci_irq_thread_fn(int irq, void *dev_id)
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{
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||||
struct pn544_hci_info *info = dev_id;
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||||
struct i2c_client *client = info->i2c_dev;
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||||
struct sk_buff *skb = NULL;
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||||
int r;
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||||
|
||||
BUG_ON(!info);
|
||||
BUG_ON(irq != info->i2c_dev->irq);
|
||||
|
||||
dev_dbg(&client->dev, "IRQ\n");
|
||||
|
||||
if (info->hard_fault != 0)
|
||||
return IRQ_HANDLED;
|
||||
|
||||
r = pn544_hci_i2c_read(client, &skb);
|
||||
if (r == -EREMOTEIO) {
|
||||
info->hard_fault = r;
|
||||
|
||||
nfc_shdlc_recv_frame(info->shdlc, NULL);
|
||||
|
||||
return IRQ_HANDLED;
|
||||
} else if ((r == -ENOMEM) || (r == -EBADMSG)) {
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
nfc_shdlc_recv_frame(info->shdlc, skb);
|
||||
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static int pn544_hci_open(struct nfc_shdlc *shdlc)
|
||||
{
|
||||
struct pn544_hci_info *info = nfc_shdlc_get_clientdata(shdlc);
|
||||
int r = 0;
|
||||
|
||||
mutex_lock(&info->info_lock);
|
||||
|
||||
if (info->state != PN544_ST_COLD) {
|
||||
r = -EBUSY;
|
||||
goto out;
|
||||
}
|
||||
|
||||
r = pn544_hci_enable(info, HCI_MODE);
|
||||
|
||||
out:
|
||||
mutex_unlock(&info->info_lock);
|
||||
return r;
|
||||
}
|
||||
|
||||
static void pn544_hci_close(struct nfc_shdlc *shdlc)
|
||||
{
|
||||
struct pn544_hci_info *info = nfc_shdlc_get_clientdata(shdlc);
|
||||
|
||||
mutex_lock(&info->info_lock);
|
||||
|
||||
if (info->state == PN544_ST_COLD)
|
||||
goto out;
|
||||
|
||||
pn544_hci_disable(info);
|
||||
|
||||
out:
|
||||
mutex_unlock(&info->info_lock);
|
||||
}
|
||||
|
||||
static int pn544_hci_ready(struct nfc_shdlc *shdlc)
|
||||
{
|
||||
struct nfc_hci_dev *hdev = nfc_shdlc_get_hci_dev(shdlc);
|
||||
struct sk_buff *skb;
|
||||
static struct hw_config {
|
||||
u8 adr[2];
|
||||
u8 value;
|
||||
} hw_config[] = {
|
||||
{{0x9f, 0x9a}, 0x00},
|
||||
|
||||
{{0x98, 0x10}, 0xbc},
|
||||
|
||||
{{0x9e, 0x71}, 0x00},
|
||||
|
||||
{{0x98, 0x09}, 0x00},
|
||||
|
||||
{{0x9e, 0xb4}, 0x00},
|
||||
|
||||
{{0x9e, 0xd9}, 0xff},
|
||||
{{0x9e, 0xda}, 0xff},
|
||||
{{0x9e, 0xdb}, 0x23},
|
||||
{{0x9e, 0xdc}, 0x21},
|
||||
{{0x9e, 0xdd}, 0x22},
|
||||
{{0x9e, 0xde}, 0x24},
|
||||
|
||||
{{0x9c, 0x01}, 0x08},
|
||||
|
||||
{{0x9e, 0xaa}, 0x01},
|
||||
|
||||
{{0x9b, 0xd1}, 0x0d},
|
||||
{{0x9b, 0xd2}, 0x24},
|
||||
{{0x9b, 0xd3}, 0x0a},
|
||||
{{0x9b, 0xd4}, 0x22},
|
||||
{{0x9b, 0xd5}, 0x08},
|
||||
{{0x9b, 0xd6}, 0x1e},
|
||||
{{0x9b, 0xdd}, 0x1c},
|
||||
|
||||
{{0x9b, 0x84}, 0x13},
|
||||
{{0x99, 0x81}, 0x7f},
|
||||
{{0x99, 0x31}, 0x70},
|
||||
|
||||
{{0x98, 0x00}, 0x3f},
|
||||
|
||||
{{0x9f, 0x09}, 0x00},
|
||||
|
||||
{{0x9f, 0x0a}, 0x05},
|
||||
|
||||
{{0x9e, 0xd1}, 0xa1},
|
||||
{{0x99, 0x23}, 0x00},
|
||||
|
||||
{{0x9e, 0x74}, 0x80},
|
||||
|
||||
{{0x9f, 0x28}, 0x10},
|
||||
|
||||
{{0x9f, 0x35}, 0x14},
|
||||
|
||||
{{0x9f, 0x36}, 0x60},
|
||||
|
||||
{{0x9c, 0x31}, 0x00},
|
||||
|
||||
{{0x9c, 0x32}, 0xc8},
|
||||
|
||||
{{0x9c, 0x19}, 0x40},
|
||||
|
||||
{{0x9c, 0x1a}, 0x40},
|
||||
|
||||
{{0x9c, 0x0c}, 0x00},
|
||||
|
||||
{{0x9c, 0x0d}, 0x00},
|
||||
|
||||
{{0x9c, 0x12}, 0x00},
|
||||
|
||||
{{0x9c, 0x13}, 0x00},
|
||||
|
||||
{{0x98, 0xa2}, 0x0e},
|
||||
|
||||
{{0x98, 0x93}, 0x40},
|
||||
|
||||
{{0x98, 0x7d}, 0x02},
|
||||
{{0x98, 0x7e}, 0x00},
|
||||
{{0x9f, 0xc8}, 0x01},
|
||||
};
|
||||
struct hw_config *p = hw_config;
|
||||
int count = ARRAY_SIZE(hw_config);
|
||||
struct sk_buff *res_skb;
|
||||
u8 param[4];
|
||||
int r;
|
||||
|
||||
param[0] = 0;
|
||||
while (count--) {
|
||||
param[1] = p->adr[0];
|
||||
param[2] = p->adr[1];
|
||||
param[3] = p->value;
|
||||
|
||||
r = nfc_hci_send_cmd(hdev, PN544_SYS_MGMT_GATE, PN544_WRITE,
|
||||
param, 4, &res_skb);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
if (res_skb->len != 1) {
|
||||
kfree_skb(res_skb);
|
||||
return -EPROTO;
|
||||
}
|
||||
|
||||
if (res_skb->data[0] != p->value) {
|
||||
kfree_skb(res_skb);
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
kfree_skb(res_skb);
|
||||
|
||||
p++;
|
||||
}
|
||||
|
||||
param[0] = NFC_HCI_UICC_HOST_ID;
|
||||
r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
|
||||
NFC_HCI_ADMIN_WHITELIST, param, 1);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
param[0] = 0x3d;
|
||||
r = nfc_hci_set_param(hdev, PN544_SYS_MGMT_GATE,
|
||||
PN544_SYS_MGMT_INFO_NOTIFICATION, param, 1);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
param[0] = 0x0;
|
||||
r = nfc_hci_set_param(hdev, NFC_HCI_RF_READER_A_GATE,
|
||||
PN544_RF_READER_A_AUTO_ACTIVATION, param, 1);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
|
||||
NFC_HCI_EVT_END_OPERATION, NULL, 0);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
param[0] = 0x1;
|
||||
r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
|
||||
PN544_PL_NFCT_DEACTIVATED, param, 1);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
param[0] = 0x0;
|
||||
r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
|
||||
PN544_PL_RDPHASES, param, 1);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
|
||||
PN544_ID_MGMT_FULL_VERSION_SW, &skb);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
if (skb->len != FULL_VERSION_LEN) {
|
||||
kfree_skb(skb);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
print_hex_dump(KERN_DEBUG, "FULL VERSION SOFTWARE INFO: ",
|
||||
DUMP_PREFIX_NONE, 16, 1,
|
||||
skb->data, FULL_VERSION_LEN, false);
|
||||
|
||||
kfree_skb(skb);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int pn544_hci_xmit(struct nfc_shdlc *shdlc, struct sk_buff *skb)
|
||||
{
|
||||
struct pn544_hci_info *info = nfc_shdlc_get_clientdata(shdlc);
|
||||
struct i2c_client *client = info->i2c_dev;
|
||||
|
||||
if (info->hard_fault != 0)
|
||||
return info->hard_fault;
|
||||
|
||||
return pn544_hci_i2c_write(client, skb->data, skb->len);
|
||||
}
|
||||
|
||||
static int pn544_hci_start_poll(struct nfc_shdlc *shdlc, u32 protocols)
|
||||
{
|
||||
struct nfc_hci_dev *hdev = nfc_shdlc_get_hci_dev(shdlc);
|
||||
u8 phases = 0;
|
||||
int r;
|
||||
u8 duration[2];
|
||||
u8 activated;
|
||||
|
||||
pr_info(DRIVER_DESC ": %s protocols = %d\n", __func__, protocols);
|
||||
|
||||
r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
|
||||
NFC_HCI_EVT_END_OPERATION, NULL, 0);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
duration[0] = 0x18;
|
||||
duration[1] = 0x6a;
|
||||
r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
|
||||
PN544_PL_EMULATION, duration, 2);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
activated = 0;
|
||||
r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
|
||||
PN544_PL_NFCT_DEACTIVATED, &activated, 1);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
if (protocols & (NFC_PROTO_ISO14443_MASK | NFC_PROTO_MIFARE_MASK |
|
||||
NFC_PROTO_JEWEL_MASK))
|
||||
phases |= 1; /* Type A */
|
||||
if (protocols & NFC_PROTO_FELICA_MASK) {
|
||||
phases |= (1 << 2); /* Type F 212 */
|
||||
phases |= (1 << 3); /* Type F 424 */
|
||||
}
|
||||
|
||||
phases |= (1 << 5); /* NFC active */
|
||||
|
||||
r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
|
||||
PN544_PL_RDPHASES, &phases, 1);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
|
||||
NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
|
||||
if (r < 0)
|
||||
nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
|
||||
NFC_HCI_EVT_END_OPERATION, NULL, 0);
|
||||
|
||||
return r;
|
||||
}
|
||||
|
||||
static int pn544_hci_target_from_gate(struct nfc_shdlc *shdlc, u8 gate,
|
||||
struct nfc_target *target)
|
||||
{
|
||||
switch (gate) {
|
||||
case PN544_RF_READER_F_GATE:
|
||||
target->supported_protocols = NFC_PROTO_FELICA_MASK;
|
||||
break;
|
||||
case PN544_RF_READER_JEWEL_GATE:
|
||||
target->supported_protocols = NFC_PROTO_JEWEL_MASK;
|
||||
target->sens_res = 0x0c00;
|
||||
break;
|
||||
default:
|
||||
return -EPROTO;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int pn544_hci_complete_target_discovered(struct nfc_shdlc *shdlc,
|
||||
u8 gate,
|
||||
struct nfc_target *target)
|
||||
{
|
||||
struct nfc_hci_dev *hdev = nfc_shdlc_get_hci_dev(shdlc);
|
||||
struct sk_buff *uid_skb;
|
||||
int r = 0;
|
||||
|
||||
if (target->supported_protocols & NFC_PROTO_MIFARE_MASK) {
|
||||
if (target->nfcid1_len != 4 && target->nfcid1_len != 7 &&
|
||||
target->nfcid1_len != 10)
|
||||
return -EPROTO;
|
||||
|
||||
r = nfc_hci_send_cmd(hdev, NFC_HCI_RF_READER_A_GATE,
|
||||
PN544_RF_READER_CMD_ACTIVATE_NEXT,
|
||||
target->nfcid1, target->nfcid1_len, NULL);
|
||||
} else if (target->supported_protocols & NFC_PROTO_FELICA_MASK) {
|
||||
r = nfc_hci_get_param(hdev, PN544_RF_READER_F_GATE,
|
||||
PN544_FELICA_ID, &uid_skb);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
if (uid_skb->len != 8) {
|
||||
kfree_skb(uid_skb);
|
||||
return -EPROTO;
|
||||
}
|
||||
|
||||
r = nfc_hci_send_cmd(hdev, PN544_RF_READER_F_GATE,
|
||||
PN544_RF_READER_CMD_ACTIVATE_NEXT,
|
||||
uid_skb->data, uid_skb->len, NULL);
|
||||
kfree_skb(uid_skb);
|
||||
} else if (target->supported_protocols & NFC_PROTO_ISO14443_MASK) {
|
||||
/*
|
||||
* TODO: maybe other ISO 14443 require some kind of continue
|
||||
* activation, but for now we've seen only this one below.
|
||||
*/
|
||||
if (target->sens_res == 0x4403) /* Type 4 Mifare DESFire */
|
||||
r = nfc_hci_send_cmd(hdev, NFC_HCI_RF_READER_A_GATE,
|
||||
PN544_RF_READER_A_CMD_CONTINUE_ACTIVATION,
|
||||
NULL, 0, NULL);
|
||||
}
|
||||
|
||||
return r;
|
||||
}
|
||||
|
||||
#define MIFARE_CMD_AUTH_KEY_A 0x60
|
||||
#define MIFARE_CMD_AUTH_KEY_B 0x61
|
||||
#define MIFARE_CMD_HEADER 2
|
||||
#define MIFARE_UID_LEN 4
|
||||
#define MIFARE_KEY_LEN 6
|
||||
#define MIFARE_CMD_LEN 12
|
||||
/*
|
||||
* Returns:
|
||||
* <= 0: driver handled the data exchange
|
||||
* 1: driver doesn't especially handle, please do standard processing
|
||||
*/
|
||||
static int pn544_hci_data_exchange(struct nfc_shdlc *shdlc,
|
||||
struct nfc_target *target,
|
||||
struct sk_buff *skb,
|
||||
struct sk_buff **res_skb)
|
||||
{
|
||||
struct nfc_hci_dev *hdev = nfc_shdlc_get_hci_dev(shdlc);
|
||||
int r;
|
||||
|
||||
pr_info(DRIVER_DESC ": %s for gate=%d\n", __func__,
|
||||
target->hci_reader_gate);
|
||||
|
||||
switch (target->hci_reader_gate) {
|
||||
case NFC_HCI_RF_READER_A_GATE:
|
||||
if (target->supported_protocols & NFC_PROTO_MIFARE_MASK) {
|
||||
/*
|
||||
* It seems that pn544 is inverting key and UID for
|
||||
* MIFARE authentication commands.
|
||||
*/
|
||||
if (skb->len == MIFARE_CMD_LEN &&
|
||||
(skb->data[0] == MIFARE_CMD_AUTH_KEY_A ||
|
||||
skb->data[0] == MIFARE_CMD_AUTH_KEY_B)) {
|
||||
u8 uid[MIFARE_UID_LEN];
|
||||
u8 *data = skb->data + MIFARE_CMD_HEADER;
|
||||
|
||||
memcpy(uid, data + MIFARE_KEY_LEN,
|
||||
MIFARE_UID_LEN);
|
||||
memmove(data + MIFARE_UID_LEN, data,
|
||||
MIFARE_KEY_LEN);
|
||||
memcpy(data, uid, MIFARE_UID_LEN);
|
||||
}
|
||||
|
||||
return nfc_hci_send_cmd(hdev, target->hci_reader_gate,
|
||||
PN544_MIFARE_CMD,
|
||||
skb->data, skb->len, res_skb);
|
||||
} else
|
||||
return 1;
|
||||
case PN544_RF_READER_F_GATE:
|
||||
*skb_push(skb, 1) = 0;
|
||||
*skb_push(skb, 1) = 0;
|
||||
|
||||
r = nfc_hci_send_cmd(hdev, target->hci_reader_gate,
|
||||
PN544_FELICA_RAW,
|
||||
skb->data, skb->len, res_skb);
|
||||
if (r == 0)
|
||||
skb_pull(*res_skb, 1);
|
||||
return r;
|
||||
case PN544_RF_READER_JEWEL_GATE:
|
||||
return nfc_hci_send_cmd(hdev, target->hci_reader_gate,
|
||||
PN544_JEWEL_RAW_CMD,
|
||||
skb->data, skb->len, res_skb);
|
||||
default:
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
|
||||
static int pn544_hci_check_presence(struct nfc_shdlc *shdlc,
|
||||
struct nfc_target *target)
|
||||
{
|
||||
struct nfc_hci_dev *hdev = nfc_shdlc_get_hci_dev(shdlc);
|
||||
|
||||
return nfc_hci_send_cmd(hdev, target->hci_reader_gate,
|
||||
PN544_RF_READER_CMD_PRESENCE_CHECK,
|
||||
NULL, 0, NULL);
|
||||
}
|
||||
|
||||
static struct nfc_shdlc_ops pn544_shdlc_ops = {
|
||||
.open = pn544_hci_open,
|
||||
.close = pn544_hci_close,
|
||||
.hci_ready = pn544_hci_ready,
|
||||
.xmit = pn544_hci_xmit,
|
||||
.start_poll = pn544_hci_start_poll,
|
||||
.target_from_gate = pn544_hci_target_from_gate,
|
||||
.complete_target_discovered = pn544_hci_complete_target_discovered,
|
||||
.data_exchange = pn544_hci_data_exchange,
|
||||
.check_presence = pn544_hci_check_presence,
|
||||
};
|
||||
|
||||
static int __devinit pn544_hci_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
struct pn544_hci_info *info;
|
||||
struct pn544_nfc_platform_data *pdata;
|
||||
int r = 0;
|
||||
u32 protocols;
|
||||
struct nfc_hci_init_data init_data;
|
||||
|
||||
dev_dbg(&client->dev, "%s\n", __func__);
|
||||
dev_dbg(&client->dev, "IRQ: %d\n", client->irq);
|
||||
|
||||
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
|
||||
dev_err(&client->dev, "Need I2C_FUNC_I2C\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
info = kzalloc(sizeof(struct pn544_hci_info), GFP_KERNEL);
|
||||
if (!info) {
|
||||
dev_err(&client->dev,
|
||||
"Cannot allocate memory for pn544_hci_info.\n");
|
||||
r = -ENOMEM;
|
||||
goto err_info_alloc;
|
||||
}
|
||||
|
||||
info->i2c_dev = client;
|
||||
info->state = PN544_ST_COLD;
|
||||
mutex_init(&info->info_lock);
|
||||
i2c_set_clientdata(client, info);
|
||||
|
||||
pdata = client->dev.platform_data;
|
||||
if (pdata == NULL) {
|
||||
dev_err(&client->dev, "No platform data\n");
|
||||
r = -EINVAL;
|
||||
goto err_pdata;
|
||||
}
|
||||
|
||||
if (pdata->request_resources == NULL) {
|
||||
dev_err(&client->dev, "request_resources() missing\n");
|
||||
r = -EINVAL;
|
||||
goto err_pdata;
|
||||
}
|
||||
|
||||
r = pdata->request_resources(client);
|
||||
if (r) {
|
||||
dev_err(&client->dev, "Cannot get platform resources\n");
|
||||
goto err_pdata;
|
||||
}
|
||||
|
||||
info->gpio_en = pdata->get_gpio(NFC_GPIO_ENABLE);
|
||||
info->gpio_fw = pdata->get_gpio(NFC_GPIO_FW_RESET);
|
||||
info->gpio_irq = pdata->get_gpio(NFC_GPIO_IRQ);
|
||||
|
||||
pn544_hci_platform_init(info);
|
||||
|
||||
r = request_threaded_irq(client->irq, NULL, pn544_hci_irq_thread_fn,
|
||||
IRQF_TRIGGER_RISING, PN544_HCI_DRIVER_NAME,
|
||||
info);
|
||||
if (r < 0) {
|
||||
dev_err(&client->dev, "Unable to register IRQ handler\n");
|
||||
goto err_rti;
|
||||
}
|
||||
|
||||
init_data.gate_count = ARRAY_SIZE(pn544_custom_gates);
|
||||
|
||||
memcpy(init_data.gates, pn544_custom_gates,
|
||||
ARRAY_SIZE(pn544_custom_gates));
|
||||
|
||||
/*
|
||||
* TODO: Session id must include the driver name + some bus addr
|
||||
* persistent info to discriminate 2 identical chips
|
||||
*/
|
||||
strcpy(init_data.session_id, "ID544HCI");
|
||||
|
||||
protocols = NFC_PROTO_JEWEL_MASK |
|
||||
NFC_PROTO_MIFARE_MASK |
|
||||
NFC_PROTO_FELICA_MASK |
|
||||
NFC_PROTO_ISO14443_MASK |
|
||||
NFC_PROTO_NFC_DEP_MASK;
|
||||
|
||||
info->shdlc = nfc_shdlc_allocate(&pn544_shdlc_ops,
|
||||
&init_data, protocols,
|
||||
PN544_CMDS_HEADROOM, 0,
|
||||
PN544_HCI_LLC_MAX_PAYLOAD,
|
||||
dev_name(&client->dev));
|
||||
if (!info->shdlc) {
|
||||
dev_err(&client->dev, "Cannot allocate nfc shdlc.\n");
|
||||
r = -ENOMEM;
|
||||
goto err_allocshdlc;
|
||||
}
|
||||
|
||||
nfc_shdlc_set_clientdata(info->shdlc, info);
|
||||
|
||||
return 0;
|
||||
|
||||
err_allocshdlc:
|
||||
free_irq(client->irq, info);
|
||||
|
||||
err_rti:
|
||||
if (pdata->free_resources != NULL)
|
||||
pdata->free_resources();
|
||||
|
||||
err_pdata:
|
||||
kfree(info);
|
||||
|
||||
err_info_alloc:
|
||||
return r;
|
||||
}
|
||||
|
||||
static __devexit int pn544_hci_remove(struct i2c_client *client)
|
||||
{
|
||||
struct pn544_hci_info *info = i2c_get_clientdata(client);
|
||||
struct pn544_nfc_platform_data *pdata = client->dev.platform_data;
|
||||
|
||||
dev_dbg(&client->dev, "%s\n", __func__);
|
||||
|
||||
nfc_shdlc_free(info->shdlc);
|
||||
|
||||
if (info->state != PN544_ST_COLD) {
|
||||
if (pdata->disable)
|
||||
pdata->disable();
|
||||
}
|
||||
|
||||
free_irq(client->irq, info);
|
||||
if (pdata->free_resources)
|
||||
pdata->free_resources();
|
||||
|
||||
kfree(info);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct i2c_driver pn544_hci_driver = {
|
||||
.driver = {
|
||||
.name = PN544_HCI_DRIVER_NAME,
|
||||
},
|
||||
.probe = pn544_hci_probe,
|
||||
.id_table = pn544_hci_id_table,
|
||||
.remove = __devexit_p(pn544_hci_remove),
|
||||
};
|
||||
|
||||
static int __init pn544_hci_init(void)
|
||||
{
|
||||
int r;
|
||||
|
||||
pr_debug(DRIVER_DESC ": %s\n", __func__);
|
||||
|
||||
r = i2c_add_driver(&pn544_hci_driver);
|
||||
if (r) {
|
||||
pr_err(PN544_HCI_DRIVER_NAME ": driver registration failed\n");
|
||||
return r;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void __exit pn544_hci_exit(void)
|
||||
{
|
||||
i2c_del_driver(&pn544_hci_driver);
|
||||
}
|
||||
|
||||
module_init(pn544_hci_init);
|
||||
module_exit(pn544_hci_exit);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_DESCRIPTION(DRIVER_DESC);
|
||||
|
|
@ -84,6 +84,12 @@ struct pn544_fw_packet {
|
|||
};
|
||||
|
||||
#ifdef __KERNEL__
|
||||
enum {
|
||||
NFC_GPIO_ENABLE,
|
||||
NFC_GPIO_FW_RESET,
|
||||
NFC_GPIO_IRQ
|
||||
};
|
||||
|
||||
/* board config */
|
||||
struct pn544_nfc_platform_data {
|
||||
int (*request_resources) (struct i2c_client *client);
|
||||
|
|
@ -91,6 +97,7 @@ struct pn544_nfc_platform_data {
|
|||
void (*enable) (int fw);
|
||||
int (*test) (void);
|
||||
void (*disable) (void);
|
||||
int (*get_gpio)(int type);
|
||||
};
|
||||
#endif /* __KERNEL__ */
|
||||
|
||||
|
|
|
|||
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