cregit-Linux how code gets into the kernel

Release 4.11 net/nfc/core.c

Directory: net/nfc
/*
 * 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;
}


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Eric Lapuyade13696.45%150.00%


Samuel Ortiz53.55%150.00%


Total141100.00%2100.00%



/**
 * 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);
}

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Eric Lapuyade3191.18%266.67%


Samuel Ortiz38.82%133.33%


Total34100.00%3100.00%




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
PersonTokensPropCommitsCommitProp
Ilan Elias11464.04%114.29%


Samuel Ortiz4726.40%457.14%


Eric Lapuyade158.43%114.29%


Joe Perches21.12%114.29%


Total178100.00%7100.00%



/**
 * 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;
}


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Ilan Elias12797.69%133.33%


Joe Perches21.54%133.33%


Eric Lapuyade10.77%133.33%


Total130100.00%3100.00%






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;
}


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Total51100.00%1100.00%




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;
}


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Lauro Ramos Venancio11673.89%120.00%


Samuel Ortiz4025.48%360.00%


Joe Perches10.64%120.00%


Total157100.00%5100.00%



/**
 * 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
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Lauro Ramos Venancio10092.59%133.33%


Thierry Escande65.56%133.33%


Joe Perches21.85%133.33%


Total108100.00%3100.00%






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;
}


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Eric Lapuyade61100.00%1100.00%


Total61100.00%1100.00%






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
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Samuel Ortiz16880.00%360.00%


Eric Lapuyade4220.00%240.00%


Total210100.00%5100.00%






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
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Samuel Ortiz13591.84%240.00%


Eric Lapuyade64.08%240.00%


Thierry Escande64.08%120.00%


Total147100.00%5100.00%






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);
}

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Samuel Ortiz9996.12%375.00%


Arron Wang43.88%125.00%


Total103100.00%4100.00%




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
PersonTokensPropCommitsCommitProp
Lauro Ramos Venancio9048.39%114.29%


Eric Lapuyade7841.94%342.86%


Ilan Elias105.38%114.29%


Samuel Ortiz63.23%114.29%


Joe Perches21.08%114.29%


Total186100.00%7100.00%



/**
 * 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
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Lauro Ramos Venancio8354.25%116.67%


Eric Lapuyade5938.56%233.33%


Christophe Ricard53.27%116.67%


Ilan Elias42.61%116.67%


Joe Perches21.31%116.67%


Total153100.00%6100.00%



/**
 * 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;
}


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Lauro Ramos Venancio10943.43%114.29%


Eric Lapuyade8333.07%457.14%


Samuel Ortiz5722.71%114.29%


Joe Perches20.80%114.29%


Total251100.00%7100.00%






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
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Samuel Ortiz4095.24%133.33%


Axel Lin12.38%133.33%


Arron Wang12.38%133.33%


Total42100.00%3100.00%




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;
}


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Samuel Ortiz19093.14%125.00%


Arron Wang146.86%375.00%


Total204100.00%4100.00%






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;
}


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Samuel Ortiz17492.55%125.00%


Arron Wang147.45%375.00%


Total188100.00%4100.00%






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);
}

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Total42100.00%2100.00%




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);
}

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Samuel Ortiz36100.00%1100.00%


Total36100.00%1100.00%




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);
}

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Samuel Ortiz43100.00%1100.00%


Total43100.00%1100.00%




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;
}

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Samuel Ortiz113100.00%2100.00%


Total113100.00%2100.00%




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
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Samuel Ortiz2278.57%150.00%


Thierry Escande621.43%150.00%


Total28100.00%2100.00%




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;
}


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Samuel Ortiz86100.00%1100.00%


Total86100.00%1100.00%



/**
 * 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;
}

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Lauro Ramos Venancio5198.08%150.00%


Samuel Ortiz11.92%150.00%


Total52100.00%2100.00%




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