Release 4.11 net/nfc/core.c
/*
* Copyright (C) 2011 Instituto Nokia de Tecnologia
*
* Authors:
* Lauro Ramos Venancio <lauro.venancio@openbossa.org>
* Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/rfkill.h>
#include <linux/nfc.h>
#include <net/genetlink.h>
#include "nfc.h"
#define VERSION "0.1"
#define NFC_CHECK_PRES_FREQ_MS 2000
int nfc_devlist_generation;
DEFINE_MUTEX(nfc_devlist_mutex);
/* NFC device ID bitmap */
static DEFINE_IDA(nfc_index_ida);
int nfc_fw_download(struct nfc_dev *dev, const char *firmware_name)
{
int rc = 0;
pr_debug("%s do firmware %s\n", dev_name(&dev->dev), firmware_name);
device_lock(&dev->dev);
if (!device_is_registered(&dev->dev)) {
rc = -ENODEV;
goto error;
}
if (dev->dev_up) {
rc = -EBUSY;
goto error;
}
if (!dev->ops->fw_download) {
rc = -EOPNOTSUPP;
goto error;
}
dev->fw_download_in_progress = true;
rc = dev->ops->fw_download(dev, firmware_name);
if (rc)
dev->fw_download_in_progress = false;
error:
device_unlock(&dev->dev);
return rc;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Eric Lapuyade | 136 | 96.45% | 1 | 50.00% |
Samuel Ortiz | 5 | 3.55% | 1 | 50.00% |
Total | 141 | 100.00% | 2 | 100.00% |
/**
* nfc_fw_download_done - inform that a firmware download was completed
*
* @dev: The nfc device to which firmware was downloaded
* @firmware_name: The firmware filename
* @result: The positive value of a standard errno value
*/
int nfc_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
u32 result)
{
dev->fw_download_in_progress = false;
return nfc_genl_fw_download_done(dev, firmware_name, result);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Eric Lapuyade | 31 | 91.18% | 2 | 66.67% |
Samuel Ortiz | 3 | 8.82% | 1 | 33.33% |
Total | 34 | 100.00% | 3 | 100.00% |
EXPORT_SYMBOL(nfc_fw_download_done);
/**
* nfc_dev_up - turn on the NFC device
*
* @dev: The nfc device to be turned on
*
* The device remains up until the nfc_dev_down function is called.
*/
int nfc_dev_up(struct nfc_dev *dev)
{
int rc = 0;
pr_debug("dev_name=%s\n", dev_name(&dev->dev));
device_lock(&dev->dev);
if (dev->rfkill && rfkill_blocked(dev->rfkill)) {
rc = -ERFKILL;
goto error;
}
if (!device_is_registered(&dev->dev)) {
rc = -ENODEV;
goto error;
}
if (dev->fw_download_in_progress) {
rc = -EBUSY;
goto error;
}
if (dev->dev_up) {
rc = -EALREADY;
goto error;
}
if (dev->ops->dev_up)
rc = dev->ops->dev_up(dev);
if (!rc)
dev->dev_up = true;
/* We have to enable the device before discovering SEs */
if (dev->ops->discover_se && dev->ops->discover_se(dev))
pr_err("SE discovery failed\n");
error:
device_unlock(&dev->dev);
return rc;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Ilan Elias | 114 | 64.04% | 1 | 14.29% |
Samuel Ortiz | 47 | 26.40% | 4 | 57.14% |
Eric Lapuyade | 15 | 8.43% | 1 | 14.29% |
Joe Perches | 2 | 1.12% | 1 | 14.29% |
Total | 178 | 100.00% | 7 | 100.00% |
/**
* nfc_dev_down - turn off the NFC device
*
* @dev: The nfc device to be turned off
*/
int nfc_dev_down(struct nfc_dev *dev)
{
int rc = 0;
pr_debug("dev_name=%s\n", dev_name(&dev->dev));
device_lock(&dev->dev);
if (!device_is_registered(&dev->dev)) {
rc = -ENODEV;
goto error;
}
if (!dev->dev_up) {
rc = -EALREADY;
goto error;
}
if (dev->polling || dev->active_target) {
rc = -EBUSY;
goto error;
}
if (dev->ops->dev_down)
dev->ops->dev_down(dev);
dev->dev_up = false;
error:
device_unlock(&dev->dev);
return rc;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Ilan Elias | 127 | 97.69% | 1 | 33.33% |
Joe Perches | 2 | 1.54% | 1 | 33.33% |
Eric Lapuyade | 1 | 0.77% | 1 | 33.33% |
Total | 130 | 100.00% | 3 | 100.00% |
static int nfc_rfkill_set_block(void *data, bool blocked)
{
struct nfc_dev *dev = data;
pr_debug("%s blocked %d", dev_name(&dev->dev), blocked);
if (!blocked)
return 0;
nfc_dev_down(dev);
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Samuel Ortiz | 51 | 100.00% | 1 | 100.00% |
Total | 51 | 100.00% | 1 | 100.00% |
static const struct rfkill_ops nfc_rfkill_ops = {
.set_block = nfc_rfkill_set_block,
};
/**
* nfc_start_poll - start polling for nfc targets
*
* @dev: The nfc device that must start polling
* @protocols: bitset of nfc protocols that must be used for polling
*
* The device remains polling for targets until a target is found or
* the nfc_stop_poll function is called.
*/
int nfc_start_poll(struct nfc_dev *dev, u32 im_protocols, u32 tm_protocols)
{
int rc;
pr_debug("dev_name %s initiator protocols 0x%x target protocols 0x%x\n",
dev_name(&dev->dev), im_protocols, tm_protocols);
if (!im_protocols && !tm_protocols)
return -EINVAL;
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;
}
rc = dev->ops->start_poll(dev, im_protocols, tm_protocols);
if (!rc) {
dev->polling = true;
dev->rf_mode = NFC_RF_NONE;
}
error:
device_unlock(&dev->dev);
return rc;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Lauro Ramos Venancio | 116 | 73.89% | 1 | 20.00% |
Samuel Ortiz | 40 | 25.48% | 3 | 60.00% |
Joe Perches | 1 | 0.64% | 1 | 20.00% |
Total | 157 | 100.00% | 5 | 100.00% |
/**
* nfc_stop_poll - stop polling for nfc targets
*
* @dev: The nfc device that must stop polling
*/
int nfc_stop_poll(struct nfc_dev *dev)
{
int rc = 0;
pr_debug("dev_name=%s\n", dev_name(&dev->dev));
device_lock(&dev->dev);
if (!device_is_registered(&dev->dev)) {
rc = -ENODEV;
goto error;
}
if (!dev->polling) {
rc = -EINVAL;
goto error;
}
dev->ops->stop_poll(dev);
dev->polling = false;
dev->rf_mode = NFC_RF_NONE;
error:
device_unlock(&dev->dev);
return rc;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Lauro Ramos Venancio | 100 | 92.59% | 1 | 33.33% |
Thierry Escande | 6 | 5.56% | 1 | 33.33% |
Joe Perches | 2 | 1.85% | 1 | 33.33% |
Total | 108 | 100.00% | 3 | 100.00% |
static struct nfc_target *nfc_find_target(struct nfc_dev *dev, u32 target_idx)
{
int i;
for (i = 0; i < dev->n_targets; i++) {
if (dev->targets[i].idx == target_idx)
return &dev->targets[i];
}
return NULL;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Eric Lapuyade | 61 | 100.00% | 1 | 100.00% |
Total | 61 | 100.00% | 1 | 100.00% |
int nfc_dep_link_up(struct nfc_dev *dev, int target_index, u8 comm_mode)
{
int rc = 0;
u8 *gb;
size_t gb_len;
struct nfc_target *target;
pr_debug("dev_name=%s comm %d\n", dev_name(&dev->dev), comm_mode);
if (!dev->ops->dep_link_up)
return -EOPNOTSUPP;
device_lock(&dev->dev);
if (!device_is_registered(&dev->dev)) {
rc = -ENODEV;
goto error;
}
if (dev->dep_link_up == true) {
rc = -EALREADY;
goto error;
}
gb = nfc_llcp_general_bytes(dev, &gb_len);
if (gb_len > NFC_MAX_GT_LEN) {
rc = -EINVAL;
goto error;
}
target = nfc_find_target(dev, target_index);
if (target == NULL) {
rc = -ENOTCONN;
goto error;
}
rc = dev->ops->dep_link_up(dev, target, comm_mode, gb, gb_len);
if (!rc) {
dev->active_target = target;
dev->rf_mode = NFC_RF_INITIATOR;
}
error:
device_unlock(&dev->dev);
return rc;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Samuel Ortiz | 168 | 80.00% | 3 | 60.00% |
Eric Lapuyade | 42 | 20.00% | 2 | 40.00% |
Total | 210 | 100.00% | 5 | 100.00% |
int nfc_dep_link_down(struct nfc_dev *dev)
{
int rc = 0;
pr_debug("dev_name=%s\n", dev_name(&dev->dev));
if (!dev->ops->dep_link_down)
return -EOPNOTSUPP;
device_lock(&dev->dev);
if (!device_is_registered(&dev->dev)) {
rc = -ENODEV;
goto error;
}
if (dev->dep_link_up == false) {
rc = -EALREADY;
goto error;
}
rc = dev->ops->dep_link_down(dev);
if (!rc) {
dev->dep_link_up = false;
dev->active_target = NULL;
dev->rf_mode = NFC_RF_NONE;
nfc_llcp_mac_is_down(dev);
nfc_genl_dep_link_down_event(dev);
}
error:
device_unlock(&dev->dev);
return rc;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Samuel Ortiz | 135 | 91.84% | 2 | 40.00% |
Eric Lapuyade | 6 | 4.08% | 2 | 40.00% |
Thierry Escande | 6 | 4.08% | 1 | 20.00% |
Total | 147 | 100.00% | 5 | 100.00% |
int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx,
u8 comm_mode, u8 rf_mode)
{
dev->dep_link_up = true;
if (!dev->active_target && rf_mode == NFC_RF_INITIATOR) {
struct nfc_target *target;
target = nfc_find_target(dev, target_idx);
if (target == NULL)
return -ENOTCONN;
dev->active_target = target;
}
dev->polling = false;
dev->rf_mode = rf_mode;
nfc_llcp_mac_is_up(dev, target_idx, comm_mode, rf_mode);
return nfc_genl_dep_link_up_event(dev, target_idx, comm_mode, rf_mode);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Samuel Ortiz | 99 | 96.12% | 3 | 75.00% |
Arron Wang | 4 | 3.88% | 1 | 25.00% |
Total | 103 | 100.00% | 4 | 100.00% |
EXPORT_SYMBOL(nfc_dep_link_is_up);
/**
* nfc_activate_target - prepare the target for data exchange
*
* @dev: The nfc device that found the target
* @target_idx: index of the target that must be activated
* @protocol: nfc protocol that will be used for data exchange
*/
int nfc_activate_target(struct nfc_dev *dev, u32 target_idx, u32 protocol)
{
int rc;
struct nfc_target *target;
pr_debug("dev_name=%s target_idx=%u protocol=%u\n",
dev_name(&dev->dev), target_idx, protocol);
device_lock(&dev->dev);
if (!device_is_registered(&dev->dev)) {
rc = -ENODEV;
goto error;
}
if (dev->active_target) {
rc = -EBUSY;
goto error;
}
target = nfc_find_target(dev, target_idx);
if (target == NULL) {
rc = -ENOTCONN;
goto error;
}
rc = dev->ops->activate_target(dev, target, protocol);
if (!rc) {
dev->active_target = target;
dev->rf_mode = NFC_RF_INITIATOR;
if (dev->ops->check_presence && !dev->shutting_down)
mod_timer(&dev->check_pres_timer, jiffies +
msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS));
}
error:
device_unlock(&dev->dev);
return rc;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Lauro Ramos Venancio | 90 | 48.39% | 1 | 14.29% |
Eric Lapuyade | 78 | 41.94% | 3 | 42.86% |
Ilan Elias | 10 | 5.38% | 1 | 14.29% |
Samuel Ortiz | 6 | 3.23% | 1 | 14.29% |
Joe Perches | 2 | 1.08% | 1 | 14.29% |
Total | 186 | 100.00% | 7 | 100.00% |
/**
* nfc_deactivate_target - deactivate a nfc target
*
* @dev: The nfc device that found the target
* @target_idx: index of the target that must be deactivated
*/
int nfc_deactivate_target(struct nfc_dev *dev, u32 target_idx, u8 mode)
{
int rc = 0;
pr_debug("dev_name=%s target_idx=%u\n",
dev_name(&dev->dev), target_idx);
device_lock(&dev->dev);
if (!device_is_registered(&dev->dev)) {
rc = -ENODEV;
goto error;
}
if (dev->active_target == NULL) {
rc = -ENOTCONN;
goto error;
}
if (dev->active_target->idx != target_idx) {
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;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Lauro Ramos Venancio | 83 | 54.25% | 1 | 16.67% |
Eric Lapuyade | 59 | 38.56% | 2 | 33.33% |
Christophe Ricard | 5 | 3.27% | 1 | 16.67% |
Ilan Elias | 4 | 2.61% | 1 | 16.67% |
Joe Perches | 2 | 1.31% | 1 | 16.67% |
Total | 153 | 100.00% | 6 | 100.00% |
/**
* 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;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Lauro Ramos Venancio | 109 | 43.43% | 1 | 14.29% |
Eric Lapuyade | 83 | 33.07% | 4 | 57.14% |
Samuel Ortiz | 57 | 22.71% | 1 | 14.29% |
Joe Perches | 2 | 0.80% | 1 | 14.29% |
Total | 251 | 100.00% | 7 | 100.00% |
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;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Samuel Ortiz | 40 | 95.24% | 1 | 33.33% |
Axel Lin | 1 | 2.38% | 1 | 33.33% |
Arron Wang | 1 | 2.38% | 1 | 33.33% |
Total | 42 | 100.00% | 3 | 100.00% |
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;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Samuel Ortiz | 190 | 93.14% | 1 | 25.00% |
Arron Wang | 14 | 6.86% | 3 | 75.00% |
Total | 204 | 100.00% | 4 | 100.00% |
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;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Samuel Ortiz | 174 | 92.55% | 1 | 25.00% |
Arron Wang | 14 | 7.45% | 3 | 75.00% |
Total | 188 | 100.00% | 4 | 100.00% |
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);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Samuel Ortiz | 42 | 100.00% | 2 | 100.00% |
Total | 42 | 100.00% | 2 | 100.00% |
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);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Samuel Ortiz | 36 | 100.00% | 1 | 100.00% |
Total | 36 | 100.00% | 1 | 100.00% |
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);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Samuel Ortiz | 43 | 100.00% | 1 | 100.00% |
Total | 43 | 100.00% | 1 | 100.00% |
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;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Samuel Ortiz | 113 | 100.00% | 2 | 100.00% |
Total | 113 | 100.00% | 2 | 100.00% |
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);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Samuel Ortiz | 22 | 78.57% | 1 | 50.00% |
Thierry Escande | 6 | 21.43% | 1 | 50.00% |
Total | 28 | 100.00% | 2 | 100.00% |
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;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Samuel Ortiz | 86 | 100.00% | 1 | 100.00% |
Total | 86 | 100.00% | 1 | 100.00% |
/**
* 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;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Lauro Ramos Venancio | 51 | 98.08% | 1 | 50.00% |
Samuel Ortiz | 1 | 1.92% | 1 | 50.00% |
Total | 52 | 100.00% | 2 | 100.00% |
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