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4b519bb493
Switch to using the new timer_setup() and from_timer() for net/nfc/* Signed-off-by: Allen Pais <allen.pais@oracle.com> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
1249 lines
25 KiB
C
1249 lines
25 KiB
C
/*
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* Copyright (C) 2011 Instituto Nokia de Tecnologia
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*
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* Authors:
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* Lauro Ramos Venancio <lauro.venancio@openbossa.org>
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* Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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, see <http://www.gnu.org/licenses/>.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/rfkill.h>
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#include <linux/nfc.h>
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#include <net/genetlink.h>
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#include "nfc.h"
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#define VERSION "0.1"
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#define NFC_CHECK_PRES_FREQ_MS 2000
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int nfc_devlist_generation;
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DEFINE_MUTEX(nfc_devlist_mutex);
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/* NFC device ID bitmap */
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static DEFINE_IDA(nfc_index_ida);
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int nfc_fw_download(struct nfc_dev *dev, const char *firmware_name)
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{
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int rc = 0;
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pr_debug("%s do firmware %s\n", dev_name(&dev->dev), firmware_name);
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device_lock(&dev->dev);
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if (!device_is_registered(&dev->dev)) {
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rc = -ENODEV;
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goto error;
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}
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if (dev->dev_up) {
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rc = -EBUSY;
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goto error;
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}
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if (!dev->ops->fw_download) {
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rc = -EOPNOTSUPP;
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goto error;
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}
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dev->fw_download_in_progress = true;
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rc = dev->ops->fw_download(dev, firmware_name);
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if (rc)
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dev->fw_download_in_progress = false;
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error:
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device_unlock(&dev->dev);
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return rc;
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}
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/**
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* nfc_fw_download_done - inform that a firmware download was completed
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*
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* @dev: The nfc device to which firmware was downloaded
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* @firmware_name: The firmware filename
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* @result: The positive value of a standard errno value
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*/
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int nfc_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
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u32 result)
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{
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dev->fw_download_in_progress = false;
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return nfc_genl_fw_download_done(dev, firmware_name, result);
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}
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EXPORT_SYMBOL(nfc_fw_download_done);
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/**
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* nfc_dev_up - turn on the NFC device
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*
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* @dev: The nfc device to be turned on
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*
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* The device remains up until the nfc_dev_down function is called.
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*/
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int nfc_dev_up(struct nfc_dev *dev)
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{
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int rc = 0;
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pr_debug("dev_name=%s\n", dev_name(&dev->dev));
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device_lock(&dev->dev);
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if (dev->rfkill && rfkill_blocked(dev->rfkill)) {
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rc = -ERFKILL;
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goto error;
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}
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if (!device_is_registered(&dev->dev)) {
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rc = -ENODEV;
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goto error;
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}
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if (dev->fw_download_in_progress) {
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rc = -EBUSY;
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goto error;
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}
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if (dev->dev_up) {
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rc = -EALREADY;
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goto error;
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}
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if (dev->ops->dev_up)
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rc = dev->ops->dev_up(dev);
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if (!rc)
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dev->dev_up = true;
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/* We have to enable the device before discovering SEs */
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if (dev->ops->discover_se && dev->ops->discover_se(dev))
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pr_err("SE discovery failed\n");
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error:
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device_unlock(&dev->dev);
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return rc;
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}
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/**
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* nfc_dev_down - turn off the NFC device
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*
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* @dev: The nfc device to be turned off
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*/
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int nfc_dev_down(struct nfc_dev *dev)
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{
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int rc = 0;
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pr_debug("dev_name=%s\n", dev_name(&dev->dev));
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device_lock(&dev->dev);
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if (!device_is_registered(&dev->dev)) {
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rc = -ENODEV;
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goto error;
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}
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if (!dev->dev_up) {
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rc = -EALREADY;
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goto error;
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}
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if (dev->polling || dev->active_target) {
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rc = -EBUSY;
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goto error;
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}
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if (dev->ops->dev_down)
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dev->ops->dev_down(dev);
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dev->dev_up = false;
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error:
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device_unlock(&dev->dev);
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return rc;
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}
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static int nfc_rfkill_set_block(void *data, bool blocked)
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{
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struct nfc_dev *dev = data;
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pr_debug("%s blocked %d", dev_name(&dev->dev), blocked);
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if (!blocked)
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return 0;
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nfc_dev_down(dev);
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return 0;
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}
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static const struct rfkill_ops nfc_rfkill_ops = {
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.set_block = nfc_rfkill_set_block,
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};
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/**
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* nfc_start_poll - start polling for nfc targets
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*
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* @dev: The nfc device that must start polling
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* @protocols: bitset of nfc protocols that must be used for polling
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*
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* The device remains polling for targets until a target is found or
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* the nfc_stop_poll function is called.
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*/
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int nfc_start_poll(struct nfc_dev *dev, u32 im_protocols, u32 tm_protocols)
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{
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int rc;
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pr_debug("dev_name %s initiator protocols 0x%x target protocols 0x%x\n",
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dev_name(&dev->dev), im_protocols, tm_protocols);
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if (!im_protocols && !tm_protocols)
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return -EINVAL;
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device_lock(&dev->dev);
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if (!device_is_registered(&dev->dev)) {
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rc = -ENODEV;
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goto error;
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}
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if (!dev->dev_up) {
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rc = -ENODEV;
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goto error;
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}
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if (dev->polling) {
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rc = -EBUSY;
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goto error;
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}
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rc = dev->ops->start_poll(dev, im_protocols, tm_protocols);
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if (!rc) {
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dev->polling = true;
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dev->rf_mode = NFC_RF_NONE;
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}
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error:
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device_unlock(&dev->dev);
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return rc;
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}
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/**
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* nfc_stop_poll - stop polling for nfc targets
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*
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* @dev: The nfc device that must stop polling
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*/
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int nfc_stop_poll(struct nfc_dev *dev)
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{
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int rc = 0;
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pr_debug("dev_name=%s\n", dev_name(&dev->dev));
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device_lock(&dev->dev);
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if (!device_is_registered(&dev->dev)) {
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rc = -ENODEV;
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goto error;
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}
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if (!dev->polling) {
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rc = -EINVAL;
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goto error;
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}
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dev->ops->stop_poll(dev);
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dev->polling = false;
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dev->rf_mode = NFC_RF_NONE;
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error:
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device_unlock(&dev->dev);
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return rc;
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}
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static struct nfc_target *nfc_find_target(struct nfc_dev *dev, u32 target_idx)
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{
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int i;
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for (i = 0; i < dev->n_targets; i++) {
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if (dev->targets[i].idx == target_idx)
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return &dev->targets[i];
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}
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return NULL;
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}
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int nfc_dep_link_up(struct nfc_dev *dev, int target_index, u8 comm_mode)
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{
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int rc = 0;
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u8 *gb;
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size_t gb_len;
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struct nfc_target *target;
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pr_debug("dev_name=%s comm %d\n", dev_name(&dev->dev), comm_mode);
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if (!dev->ops->dep_link_up)
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return -EOPNOTSUPP;
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device_lock(&dev->dev);
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if (!device_is_registered(&dev->dev)) {
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rc = -ENODEV;
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goto error;
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}
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if (dev->dep_link_up == true) {
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rc = -EALREADY;
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goto error;
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}
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gb = nfc_llcp_general_bytes(dev, &gb_len);
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if (gb_len > NFC_MAX_GT_LEN) {
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rc = -EINVAL;
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goto error;
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}
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target = nfc_find_target(dev, target_index);
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if (target == NULL) {
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rc = -ENOTCONN;
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goto error;
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}
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rc = dev->ops->dep_link_up(dev, target, comm_mode, gb, gb_len);
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if (!rc) {
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dev->active_target = target;
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dev->rf_mode = NFC_RF_INITIATOR;
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}
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error:
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device_unlock(&dev->dev);
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return rc;
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}
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int nfc_dep_link_down(struct nfc_dev *dev)
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{
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int rc = 0;
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pr_debug("dev_name=%s\n", dev_name(&dev->dev));
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if (!dev->ops->dep_link_down)
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return -EOPNOTSUPP;
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device_lock(&dev->dev);
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if (!device_is_registered(&dev->dev)) {
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rc = -ENODEV;
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goto error;
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}
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if (dev->dep_link_up == false) {
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rc = -EALREADY;
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goto error;
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}
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rc = dev->ops->dep_link_down(dev);
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if (!rc) {
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dev->dep_link_up = false;
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dev->active_target = NULL;
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dev->rf_mode = NFC_RF_NONE;
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nfc_llcp_mac_is_down(dev);
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nfc_genl_dep_link_down_event(dev);
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}
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error:
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device_unlock(&dev->dev);
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return rc;
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}
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int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx,
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u8 comm_mode, u8 rf_mode)
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{
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dev->dep_link_up = true;
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if (!dev->active_target && rf_mode == NFC_RF_INITIATOR) {
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struct nfc_target *target;
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target = nfc_find_target(dev, target_idx);
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if (target == NULL)
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return -ENOTCONN;
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dev->active_target = target;
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}
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dev->polling = false;
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dev->rf_mode = rf_mode;
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nfc_llcp_mac_is_up(dev, target_idx, comm_mode, rf_mode);
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return nfc_genl_dep_link_up_event(dev, target_idx, comm_mode, rf_mode);
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}
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EXPORT_SYMBOL(nfc_dep_link_is_up);
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/**
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* nfc_activate_target - prepare the target for data exchange
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*
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* @dev: The nfc device that found the target
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* @target_idx: index of the target that must be activated
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* @protocol: nfc protocol that will be used for data exchange
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*/
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int nfc_activate_target(struct nfc_dev *dev, u32 target_idx, u32 protocol)
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{
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int rc;
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struct nfc_target *target;
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pr_debug("dev_name=%s target_idx=%u protocol=%u\n",
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dev_name(&dev->dev), target_idx, protocol);
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device_lock(&dev->dev);
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if (!device_is_registered(&dev->dev)) {
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rc = -ENODEV;
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goto error;
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}
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if (dev->active_target) {
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rc = -EBUSY;
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goto error;
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}
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target = nfc_find_target(dev, target_idx);
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if (target == NULL) {
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rc = -ENOTCONN;
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goto error;
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}
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rc = dev->ops->activate_target(dev, target, protocol);
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if (!rc) {
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dev->active_target = target;
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dev->rf_mode = NFC_RF_INITIATOR;
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|
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if (dev->ops->check_presence && !dev->shutting_down)
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mod_timer(&dev->check_pres_timer, jiffies +
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msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
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}
|
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error:
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device_unlock(&dev->dev);
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return rc;
|
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}
|
|
|
|
/**
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|
* nfc_deactivate_target - deactivate a nfc target
|
|
*
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* @dev: The nfc device that found the target
|
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* @target_idx: index of the target that must be deactivated
|
|
*/
|
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int nfc_deactivate_target(struct nfc_dev *dev, u32 target_idx, u8 mode)
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|
{
|
|
int rc = 0;
|
|
|
|
pr_debug("dev_name=%s target_idx=%u\n",
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|
dev_name(&dev->dev), target_idx);
|
|
|
|
device_lock(&dev->dev);
|
|
|
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if (!device_is_registered(&dev->dev)) {
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|
rc = -ENODEV;
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|
goto error;
|
|
}
|
|
|
|
if (dev->active_target == NULL) {
|
|
rc = -ENOTCONN;
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|
goto error;
|
|
}
|
|
|
|
if (dev->active_target->idx != target_idx) {
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|
rc = -ENOTCONN;
|
|
goto error;
|
|
}
|
|
|
|
if (dev->ops->check_presence)
|
|
del_timer_sync(&dev->check_pres_timer);
|
|
|
|
dev->ops->deactivate_target(dev, dev->active_target, mode);
|
|
dev->active_target = NULL;
|
|
|
|
error:
|
|
device_unlock(&dev->dev);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* nfc_data_exchange - transceive data
|
|
*
|
|
* @dev: The nfc device that found the target
|
|
* @target_idx: index of the target
|
|
* @skb: data to be sent
|
|
* @cb: callback called when the response is received
|
|
* @cb_context: parameter for the callback function
|
|
*
|
|
* The user must wait for the callback before calling this function again.
|
|
*/
|
|
int nfc_data_exchange(struct nfc_dev *dev, u32 target_idx, struct sk_buff *skb,
|
|
data_exchange_cb_t cb, void *cb_context)
|
|
{
|
|
int rc;
|
|
|
|
pr_debug("dev_name=%s target_idx=%u skb->len=%u\n",
|
|
dev_name(&dev->dev), target_idx, skb->len);
|
|
|
|
device_lock(&dev->dev);
|
|
|
|
if (!device_is_registered(&dev->dev)) {
|
|
rc = -ENODEV;
|
|
kfree_skb(skb);
|
|
goto error;
|
|
}
|
|
|
|
if (dev->rf_mode == NFC_RF_INITIATOR && dev->active_target != NULL) {
|
|
if (dev->active_target->idx != target_idx) {
|
|
rc = -EADDRNOTAVAIL;
|
|
kfree_skb(skb);
|
|
goto error;
|
|
}
|
|
|
|
if (dev->ops->check_presence)
|
|
del_timer_sync(&dev->check_pres_timer);
|
|
|
|
rc = dev->ops->im_transceive(dev, dev->active_target, skb, cb,
|
|
cb_context);
|
|
|
|
if (!rc && dev->ops->check_presence && !dev->shutting_down)
|
|
mod_timer(&dev->check_pres_timer, jiffies +
|
|
msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
|
|
} else if (dev->rf_mode == NFC_RF_TARGET && dev->ops->tm_send != NULL) {
|
|
rc = dev->ops->tm_send(dev, skb);
|
|
} else {
|
|
rc = -ENOTCONN;
|
|
kfree_skb(skb);
|
|
goto error;
|
|
}
|
|
|
|
|
|
error:
|
|
device_unlock(&dev->dev);
|
|
return rc;
|
|
}
|
|
|
|
struct nfc_se *nfc_find_se(struct nfc_dev *dev, u32 se_idx)
|
|
{
|
|
struct nfc_se *se;
|
|
|
|
list_for_each_entry(se, &dev->secure_elements, list)
|
|
if (se->idx == se_idx)
|
|
return se;
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(nfc_find_se);
|
|
|
|
int nfc_enable_se(struct nfc_dev *dev, u32 se_idx)
|
|
{
|
|
struct nfc_se *se;
|
|
int rc;
|
|
|
|
pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
|
|
|
|
device_lock(&dev->dev);
|
|
|
|
if (!device_is_registered(&dev->dev)) {
|
|
rc = -ENODEV;
|
|
goto error;
|
|
}
|
|
|
|
if (!dev->dev_up) {
|
|
rc = -ENODEV;
|
|
goto error;
|
|
}
|
|
|
|
if (dev->polling) {
|
|
rc = -EBUSY;
|
|
goto error;
|
|
}
|
|
|
|
if (!dev->ops->enable_se || !dev->ops->disable_se) {
|
|
rc = -EOPNOTSUPP;
|
|
goto error;
|
|
}
|
|
|
|
se = nfc_find_se(dev, se_idx);
|
|
if (!se) {
|
|
rc = -EINVAL;
|
|
goto error;
|
|
}
|
|
|
|
if (se->state == NFC_SE_ENABLED) {
|
|
rc = -EALREADY;
|
|
goto error;
|
|
}
|
|
|
|
rc = dev->ops->enable_se(dev, se_idx);
|
|
if (rc >= 0)
|
|
se->state = NFC_SE_ENABLED;
|
|
|
|
error:
|
|
device_unlock(&dev->dev);
|
|
return rc;
|
|
}
|
|
|
|
int nfc_disable_se(struct nfc_dev *dev, u32 se_idx)
|
|
{
|
|
struct nfc_se *se;
|
|
int rc;
|
|
|
|
pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
|
|
|
|
device_lock(&dev->dev);
|
|
|
|
if (!device_is_registered(&dev->dev)) {
|
|
rc = -ENODEV;
|
|
goto error;
|
|
}
|
|
|
|
if (!dev->dev_up) {
|
|
rc = -ENODEV;
|
|
goto error;
|
|
}
|
|
|
|
if (!dev->ops->enable_se || !dev->ops->disable_se) {
|
|
rc = -EOPNOTSUPP;
|
|
goto error;
|
|
}
|
|
|
|
se = nfc_find_se(dev, se_idx);
|
|
if (!se) {
|
|
rc = -EINVAL;
|
|
goto error;
|
|
}
|
|
|
|
if (se->state == NFC_SE_DISABLED) {
|
|
rc = -EALREADY;
|
|
goto error;
|
|
}
|
|
|
|
rc = dev->ops->disable_se(dev, se_idx);
|
|
if (rc >= 0)
|
|
se->state = NFC_SE_DISABLED;
|
|
|
|
error:
|
|
device_unlock(&dev->dev);
|
|
return rc;
|
|
}
|
|
|
|
int nfc_set_remote_general_bytes(struct nfc_dev *dev, u8 *gb, u8 gb_len)
|
|
{
|
|
pr_debug("dev_name=%s gb_len=%d\n", dev_name(&dev->dev), gb_len);
|
|
|
|
return nfc_llcp_set_remote_gb(dev, gb, gb_len);
|
|
}
|
|
EXPORT_SYMBOL(nfc_set_remote_general_bytes);
|
|
|
|
u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len)
|
|
{
|
|
pr_debug("dev_name=%s\n", dev_name(&dev->dev));
|
|
|
|
return nfc_llcp_general_bytes(dev, gb_len);
|
|
}
|
|
EXPORT_SYMBOL(nfc_get_local_general_bytes);
|
|
|
|
int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb)
|
|
{
|
|
/* Only LLCP target mode for now */
|
|
if (dev->dep_link_up == false) {
|
|
kfree_skb(skb);
|
|
return -ENOLINK;
|
|
}
|
|
|
|
return nfc_llcp_data_received(dev, skb);
|
|
}
|
|
EXPORT_SYMBOL(nfc_tm_data_received);
|
|
|
|
int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode,
|
|
u8 *gb, size_t gb_len)
|
|
{
|
|
int rc;
|
|
|
|
device_lock(&dev->dev);
|
|
|
|
dev->polling = false;
|
|
|
|
if (gb != NULL) {
|
|
rc = nfc_set_remote_general_bytes(dev, gb, gb_len);
|
|
if (rc < 0)
|
|
goto out;
|
|
}
|
|
|
|
dev->rf_mode = NFC_RF_TARGET;
|
|
|
|
if (protocol == NFC_PROTO_NFC_DEP_MASK)
|
|
nfc_dep_link_is_up(dev, 0, comm_mode, NFC_RF_TARGET);
|
|
|
|
rc = nfc_genl_tm_activated(dev, protocol);
|
|
|
|
out:
|
|
device_unlock(&dev->dev);
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL(nfc_tm_activated);
|
|
|
|
int nfc_tm_deactivated(struct nfc_dev *dev)
|
|
{
|
|
dev->dep_link_up = false;
|
|
dev->rf_mode = NFC_RF_NONE;
|
|
|
|
return nfc_genl_tm_deactivated(dev);
|
|
}
|
|
EXPORT_SYMBOL(nfc_tm_deactivated);
|
|
|
|
/**
|
|
* nfc_alloc_send_skb - allocate a skb for data exchange responses
|
|
*
|
|
* @size: size to allocate
|
|
* @gfp: gfp flags
|
|
*/
|
|
struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk,
|
|
unsigned int flags, unsigned int size,
|
|
unsigned int *err)
|
|
{
|
|
struct sk_buff *skb;
|
|
unsigned int total_size;
|
|
|
|
total_size = size +
|
|
dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
|
|
|
|
skb = sock_alloc_send_skb(sk, total_size, flags & MSG_DONTWAIT, err);
|
|
if (skb)
|
|
skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
|
|
|
|
return skb;
|
|
}
|
|
|
|
/**
|
|
* nfc_alloc_recv_skb - allocate a skb for data exchange responses
|
|
*
|
|
* @size: size to allocate
|
|
* @gfp: gfp flags
|
|
*/
|
|
struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp)
|
|
{
|
|
struct sk_buff *skb;
|
|
unsigned int total_size;
|
|
|
|
total_size = size + 1;
|
|
skb = alloc_skb(total_size, gfp);
|
|
|
|
if (skb)
|
|
skb_reserve(skb, 1);
|
|
|
|
return skb;
|
|
}
|
|
EXPORT_SYMBOL(nfc_alloc_recv_skb);
|
|
|
|
/**
|
|
* nfc_targets_found - inform that targets were found
|
|
*
|
|
* @dev: The nfc device that found the targets
|
|
* @targets: array of nfc targets found
|
|
* @ntargets: targets array size
|
|
*
|
|
* The device driver must call this function when one or many nfc targets
|
|
* are found. After calling this function, the device driver must stop
|
|
* polling for targets.
|
|
* NOTE: This function can be called with targets=NULL and n_targets=0 to
|
|
* notify a driver error, meaning that the polling operation cannot complete.
|
|
* IMPORTANT: this function must not be called from an atomic context.
|
|
* In addition, it must also not be called from a context that would prevent
|
|
* the NFC Core to call other nfc ops entry point concurrently.
|
|
*/
|
|
int nfc_targets_found(struct nfc_dev *dev,
|
|
struct nfc_target *targets, int n_targets)
|
|
{
|
|
int i;
|
|
|
|
pr_debug("dev_name=%s n_targets=%d\n", dev_name(&dev->dev), n_targets);
|
|
|
|
for (i = 0; i < n_targets; i++)
|
|
targets[i].idx = dev->target_next_idx++;
|
|
|
|
device_lock(&dev->dev);
|
|
|
|
if (dev->polling == false) {
|
|
device_unlock(&dev->dev);
|
|
return 0;
|
|
}
|
|
|
|
dev->polling = false;
|
|
|
|
dev->targets_generation++;
|
|
|
|
kfree(dev->targets);
|
|
dev->targets = NULL;
|
|
|
|
if (targets) {
|
|
dev->targets = kmemdup(targets,
|
|
n_targets * sizeof(struct nfc_target),
|
|
GFP_ATOMIC);
|
|
|
|
if (!dev->targets) {
|
|
dev->n_targets = 0;
|
|
device_unlock(&dev->dev);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
dev->n_targets = n_targets;
|
|
device_unlock(&dev->dev);
|
|
|
|
nfc_genl_targets_found(dev);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(nfc_targets_found);
|
|
|
|
/**
|
|
* nfc_target_lost - inform that an activated target went out of field
|
|
*
|
|
* @dev: The nfc device that had the activated target in field
|
|
* @target_idx: the nfc index of the target
|
|
*
|
|
* The device driver must call this function when the activated target
|
|
* goes out of the field.
|
|
* IMPORTANT: this function must not be called from an atomic context.
|
|
* In addition, it must also not be called from a context that would prevent
|
|
* the NFC Core to call other nfc ops entry point concurrently.
|
|
*/
|
|
int nfc_target_lost(struct nfc_dev *dev, u32 target_idx)
|
|
{
|
|
struct nfc_target *tg;
|
|
int i;
|
|
|
|
pr_debug("dev_name %s n_target %d\n", dev_name(&dev->dev), target_idx);
|
|
|
|
device_lock(&dev->dev);
|
|
|
|
for (i = 0; i < dev->n_targets; i++) {
|
|
tg = &dev->targets[i];
|
|
if (tg->idx == target_idx)
|
|
break;
|
|
}
|
|
|
|
if (i == dev->n_targets) {
|
|
device_unlock(&dev->dev);
|
|
return -EINVAL;
|
|
}
|
|
|
|
dev->targets_generation++;
|
|
dev->n_targets--;
|
|
dev->active_target = NULL;
|
|
|
|
if (dev->n_targets) {
|
|
memcpy(&dev->targets[i], &dev->targets[i + 1],
|
|
(dev->n_targets - i) * sizeof(struct nfc_target));
|
|
} else {
|
|
kfree(dev->targets);
|
|
dev->targets = NULL;
|
|
}
|
|
|
|
device_unlock(&dev->dev);
|
|
|
|
nfc_genl_target_lost(dev, target_idx);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(nfc_target_lost);
|
|
|
|
inline void nfc_driver_failure(struct nfc_dev *dev, int err)
|
|
{
|
|
nfc_targets_found(dev, NULL, 0);
|
|
}
|
|
EXPORT_SYMBOL(nfc_driver_failure);
|
|
|
|
int nfc_add_se(struct nfc_dev *dev, u32 se_idx, u16 type)
|
|
{
|
|
struct nfc_se *se;
|
|
int rc;
|
|
|
|
pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
|
|
|
|
se = nfc_find_se(dev, se_idx);
|
|
if (se)
|
|
return -EALREADY;
|
|
|
|
se = kzalloc(sizeof(struct nfc_se), GFP_KERNEL);
|
|
if (!se)
|
|
return -ENOMEM;
|
|
|
|
se->idx = se_idx;
|
|
se->type = type;
|
|
se->state = NFC_SE_DISABLED;
|
|
INIT_LIST_HEAD(&se->list);
|
|
|
|
list_add(&se->list, &dev->secure_elements);
|
|
|
|
rc = nfc_genl_se_added(dev, se_idx, type);
|
|
if (rc < 0) {
|
|
list_del(&se->list);
|
|
kfree(se);
|
|
|
|
return rc;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(nfc_add_se);
|
|
|
|
int nfc_remove_se(struct nfc_dev *dev, u32 se_idx)
|
|
{
|
|
struct nfc_se *se, *n;
|
|
int rc;
|
|
|
|
pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
|
|
|
|
list_for_each_entry_safe(se, n, &dev->secure_elements, list)
|
|
if (se->idx == se_idx) {
|
|
rc = nfc_genl_se_removed(dev, se_idx);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
list_del(&se->list);
|
|
kfree(se);
|
|
|
|
return 0;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL(nfc_remove_se);
|
|
|
|
int nfc_se_transaction(struct nfc_dev *dev, u8 se_idx,
|
|
struct nfc_evt_transaction *evt_transaction)
|
|
{
|
|
int rc;
|
|
|
|
pr_debug("transaction: %x\n", se_idx);
|
|
|
|
device_lock(&dev->dev);
|
|
|
|
if (!evt_transaction) {
|
|
rc = -EPROTO;
|
|
goto out;
|
|
}
|
|
|
|
rc = nfc_genl_se_transaction(dev, se_idx, evt_transaction);
|
|
out:
|
|
device_unlock(&dev->dev);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL(nfc_se_transaction);
|
|
|
|
int nfc_se_connectivity(struct nfc_dev *dev, u8 se_idx)
|
|
{
|
|
int rc;
|
|
|
|
pr_debug("connectivity: %x\n", se_idx);
|
|
|
|
device_lock(&dev->dev);
|
|
rc = nfc_genl_se_connectivity(dev, se_idx);
|
|
device_unlock(&dev->dev);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL(nfc_se_connectivity);
|
|
|
|
static void nfc_release(struct device *d)
|
|
{
|
|
struct nfc_dev *dev = to_nfc_dev(d);
|
|
struct nfc_se *se, *n;
|
|
|
|
pr_debug("dev_name=%s\n", dev_name(&dev->dev));
|
|
|
|
nfc_genl_data_exit(&dev->genl_data);
|
|
kfree(dev->targets);
|
|
|
|
list_for_each_entry_safe(se, n, &dev->secure_elements, list) {
|
|
nfc_genl_se_removed(dev, se->idx);
|
|
list_del(&se->list);
|
|
kfree(se);
|
|
}
|
|
|
|
ida_simple_remove(&nfc_index_ida, dev->idx);
|
|
|
|
kfree(dev);
|
|
}
|
|
|
|
static void nfc_check_pres_work(struct work_struct *work)
|
|
{
|
|
struct nfc_dev *dev = container_of(work, struct nfc_dev,
|
|
check_pres_work);
|
|
int rc;
|
|
|
|
device_lock(&dev->dev);
|
|
|
|
if (dev->active_target && timer_pending(&dev->check_pres_timer) == 0) {
|
|
rc = dev->ops->check_presence(dev, dev->active_target);
|
|
if (rc == -EOPNOTSUPP)
|
|
goto exit;
|
|
if (rc) {
|
|
u32 active_target_idx = dev->active_target->idx;
|
|
device_unlock(&dev->dev);
|
|
nfc_target_lost(dev, active_target_idx);
|
|
return;
|
|
}
|
|
|
|
if (!dev->shutting_down)
|
|
mod_timer(&dev->check_pres_timer, jiffies +
|
|
msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
|
|
}
|
|
|
|
exit:
|
|
device_unlock(&dev->dev);
|
|
}
|
|
|
|
static void nfc_check_pres_timeout(struct timer_list *t)
|
|
{
|
|
struct nfc_dev *dev = from_timer(dev, t, check_pres_timer);
|
|
|
|
schedule_work(&dev->check_pres_work);
|
|
}
|
|
|
|
struct class nfc_class = {
|
|
.name = "nfc",
|
|
.dev_release = nfc_release,
|
|
};
|
|
EXPORT_SYMBOL(nfc_class);
|
|
|
|
static int match_idx(struct device *d, const void *data)
|
|
{
|
|
struct nfc_dev *dev = to_nfc_dev(d);
|
|
const unsigned int *idx = data;
|
|
|
|
return dev->idx == *idx;
|
|
}
|
|
|
|
struct nfc_dev *nfc_get_device(unsigned int idx)
|
|
{
|
|
struct device *d;
|
|
|
|
d = class_find_device(&nfc_class, NULL, &idx, match_idx);
|
|
if (!d)
|
|
return NULL;
|
|
|
|
return to_nfc_dev(d);
|
|
}
|
|
|
|
/**
|
|
* nfc_allocate_device - allocate a new nfc device
|
|
*
|
|
* @ops: device operations
|
|
* @supported_protocols: NFC protocols supported by the device
|
|
*/
|
|
struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
|
|
u32 supported_protocols,
|
|
int tx_headroom, int tx_tailroom)
|
|
{
|
|
struct nfc_dev *dev;
|
|
int rc;
|
|
|
|
if (!ops->start_poll || !ops->stop_poll || !ops->activate_target ||
|
|
!ops->deactivate_target || !ops->im_transceive)
|
|
return NULL;
|
|
|
|
if (!supported_protocols)
|
|
return NULL;
|
|
|
|
dev = kzalloc(sizeof(struct nfc_dev), GFP_KERNEL);
|
|
if (!dev)
|
|
return NULL;
|
|
|
|
rc = ida_simple_get(&nfc_index_ida, 0, 0, GFP_KERNEL);
|
|
if (rc < 0)
|
|
goto err_free_dev;
|
|
dev->idx = rc;
|
|
|
|
dev->dev.class = &nfc_class;
|
|
dev_set_name(&dev->dev, "nfc%d", dev->idx);
|
|
device_initialize(&dev->dev);
|
|
|
|
dev->ops = ops;
|
|
dev->supported_protocols = supported_protocols;
|
|
dev->tx_headroom = tx_headroom;
|
|
dev->tx_tailroom = tx_tailroom;
|
|
INIT_LIST_HEAD(&dev->secure_elements);
|
|
|
|
nfc_genl_data_init(&dev->genl_data);
|
|
|
|
dev->rf_mode = NFC_RF_NONE;
|
|
|
|
/* first generation must not be 0 */
|
|
dev->targets_generation = 1;
|
|
|
|
if (ops->check_presence) {
|
|
timer_setup(&dev->check_pres_timer, nfc_check_pres_timeout, 0);
|
|
INIT_WORK(&dev->check_pres_work, nfc_check_pres_work);
|
|
}
|
|
|
|
return dev;
|
|
|
|
err_free_dev:
|
|
kfree(dev);
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(nfc_allocate_device);
|
|
|
|
/**
|
|
* nfc_register_device - register a nfc device in the nfc subsystem
|
|
*
|
|
* @dev: The nfc device to register
|
|
*/
|
|
int nfc_register_device(struct nfc_dev *dev)
|
|
{
|
|
int rc;
|
|
|
|
pr_debug("dev_name=%s\n", dev_name(&dev->dev));
|
|
|
|
mutex_lock(&nfc_devlist_mutex);
|
|
nfc_devlist_generation++;
|
|
rc = device_add(&dev->dev);
|
|
mutex_unlock(&nfc_devlist_mutex);
|
|
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
rc = nfc_llcp_register_device(dev);
|
|
if (rc)
|
|
pr_err("Could not register llcp device\n");
|
|
|
|
rc = nfc_genl_device_added(dev);
|
|
if (rc)
|
|
pr_debug("The userspace won't be notified that the device %s was added\n",
|
|
dev_name(&dev->dev));
|
|
|
|
dev->rfkill = rfkill_alloc(dev_name(&dev->dev), &dev->dev,
|
|
RFKILL_TYPE_NFC, &nfc_rfkill_ops, dev);
|
|
if (dev->rfkill) {
|
|
if (rfkill_register(dev->rfkill) < 0) {
|
|
rfkill_destroy(dev->rfkill);
|
|
dev->rfkill = NULL;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(nfc_register_device);
|
|
|
|
/**
|
|
* nfc_unregister_device - unregister a nfc device in the nfc subsystem
|
|
*
|
|
* @dev: The nfc device to unregister
|
|
*/
|
|
void nfc_unregister_device(struct nfc_dev *dev)
|
|
{
|
|
int rc;
|
|
|
|
pr_debug("dev_name=%s\n", dev_name(&dev->dev));
|
|
|
|
if (dev->rfkill) {
|
|
rfkill_unregister(dev->rfkill);
|
|
rfkill_destroy(dev->rfkill);
|
|
}
|
|
|
|
if (dev->ops->check_presence) {
|
|
device_lock(&dev->dev);
|
|
dev->shutting_down = true;
|
|
device_unlock(&dev->dev);
|
|
del_timer_sync(&dev->check_pres_timer);
|
|
cancel_work_sync(&dev->check_pres_work);
|
|
}
|
|
|
|
rc = nfc_genl_device_removed(dev);
|
|
if (rc)
|
|
pr_debug("The userspace won't be notified that the device %s "
|
|
"was removed\n", dev_name(&dev->dev));
|
|
|
|
nfc_llcp_unregister_device(dev);
|
|
|
|
mutex_lock(&nfc_devlist_mutex);
|
|
nfc_devlist_generation++;
|
|
device_del(&dev->dev);
|
|
mutex_unlock(&nfc_devlist_mutex);
|
|
}
|
|
EXPORT_SYMBOL(nfc_unregister_device);
|
|
|
|
static int __init nfc_init(void)
|
|
{
|
|
int rc;
|
|
|
|
pr_info("NFC Core ver %s\n", VERSION);
|
|
|
|
rc = class_register(&nfc_class);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = nfc_genl_init();
|
|
if (rc)
|
|
goto err_genl;
|
|
|
|
/* the first generation must not be 0 */
|
|
nfc_devlist_generation = 1;
|
|
|
|
rc = rawsock_init();
|
|
if (rc)
|
|
goto err_rawsock;
|
|
|
|
rc = nfc_llcp_init();
|
|
if (rc)
|
|
goto err_llcp_sock;
|
|
|
|
rc = af_nfc_init();
|
|
if (rc)
|
|
goto err_af_nfc;
|
|
|
|
return 0;
|
|
|
|
err_af_nfc:
|
|
nfc_llcp_exit();
|
|
err_llcp_sock:
|
|
rawsock_exit();
|
|
err_rawsock:
|
|
nfc_genl_exit();
|
|
err_genl:
|
|
class_unregister(&nfc_class);
|
|
return rc;
|
|
}
|
|
|
|
static void __exit nfc_exit(void)
|
|
{
|
|
af_nfc_exit();
|
|
nfc_llcp_exit();
|
|
rawsock_exit();
|
|
nfc_genl_exit();
|
|
class_unregister(&nfc_class);
|
|
}
|
|
|
|
subsys_initcall(nfc_init);
|
|
module_exit(nfc_exit);
|
|
|
|
MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
|
|
MODULE_DESCRIPTION("NFC Core ver " VERSION);
|
|
MODULE_VERSION(VERSION);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_NETPROTO(PF_NFC);
|
|
MODULE_ALIAS_GENL_FAMILY(NFC_GENL_NAME);
|