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/*
* 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, write to the
* Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/

#include <net/genetlink.h>
#include <linux/nfc.h>
#include <linux/slab.h>

#include "nfc.h"

static struct genl_multicast_group nfc_genl_event_mcgrp = {
.name = NFC_GENL_MCAST_EVENT_NAME,
};

struct genl_family nfc_genl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = 0,
.name = NFC_GENL_NAME,
.version = NFC_GENL_VERSION,
.maxattr = NFC_ATTR_MAX,
};

static const struct nla_policy nfc_genl_policy[NFC_ATTR_MAX + 1] = {
[NFC_ATTR_DEVICE_INDEX] = { .type = NLA_U32 },
[NFC_ATTR_DEVICE_NAME] = { .type = NLA_STRING,
.len = NFC_DEVICE_NAME_MAXSIZE },
[NFC_ATTR_PROTOCOLS] = { .type = NLA_U32 },
};

static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target,
struct netlink_callback *cb, int flags)
{
void *hdr;

nfc_dbg("entry");

hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
&nfc_genl_family, flags, NFC_CMD_GET_TARGET);
if (!hdr)
return -EMSGSIZE;

genl_dump_check_consistent(cb, hdr, &nfc_genl_family);

NLA_PUT_U32(msg, NFC_ATTR_TARGET_INDEX, target->idx);
NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS,
target->supported_protocols);
NLA_PUT_U16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res);
NLA_PUT_U8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res);

return genlmsg_end(msg, hdr);

nla_put_failure:
genlmsg_cancel(msg, hdr);
return -EMSGSIZE;
}

static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
{
struct nfc_dev *dev;
int rc;
u32 idx;

rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize,
nfc_genl_family.attrbuf,
nfc_genl_family.maxattr,
nfc_genl_policy);
if (rc < 0)
return ERR_PTR(rc);

if (!nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX])
return ERR_PTR(-EINVAL);

idx = nla_get_u32(nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX]);

dev = nfc_get_device(idx);
if (!dev)
return ERR_PTR(-ENODEV);

return dev;
}

static int nfc_genl_dump_targets(struct sk_buff *skb,
struct netlink_callback *cb)
{
int i = cb->args[0];
struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
int rc;

nfc_dbg("entry");

if (!dev) {
dev = __get_device_from_cb(cb);
if (IS_ERR(dev))
return PTR_ERR(dev);

cb->args[1] = (long) dev;
}

spin_lock_bh(&dev->targets_lock);

cb->seq = dev->targets_generation;

while (i < dev->n_targets) {
rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
NLM_F_MULTI);
if (rc < 0)
break;

i++;
}

spin_unlock_bh(&dev->targets_lock);

cb->args[0] = i;

return skb->len;
}

static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
{
struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];

nfc_dbg("entry");

if (dev)
nfc_put_device(dev);

return 0;
}

int nfc_genl_targets_found(struct nfc_dev *dev)
{
struct sk_buff *msg;
void *hdr;

nfc_dbg("entry");

dev->genl_data.poll_req_pid = 0;

msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
if (!msg)
return -ENOMEM;

hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
NFC_EVENT_TARGETS_FOUND);
if (!hdr)
goto free_msg;

NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);

genlmsg_end(msg, hdr);

return genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);

nla_put_failure:
genlmsg_cancel(msg, hdr);
free_msg:
nlmsg_free(msg);
return -EMSGSIZE;
}

int nfc_genl_device_added(struct nfc_dev *dev)
{
struct sk_buff *msg;
void *hdr;

nfc_dbg("entry");

msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
if (!msg)
return -ENOMEM;

hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
NFC_EVENT_DEVICE_ADDED);
if (!hdr)
goto free_msg;

NLA_PUT_STRING(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev));
NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols);

genlmsg_end(msg, hdr);

genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);

return 0;

nla_put_failure:
genlmsg_cancel(msg, hdr);
free_msg:
nlmsg_free(msg);
return -EMSGSIZE;
}

int nfc_genl_device_removed(struct nfc_dev *dev)
{
struct sk_buff *msg;
void *hdr;

nfc_dbg("entry");

msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
if (!msg)
return -ENOMEM;

hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
NFC_EVENT_DEVICE_REMOVED);
if (!hdr)
goto free_msg;

NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);

genlmsg_end(msg, hdr);

genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);

return 0;

nla_put_failure:
genlmsg_cancel(msg, hdr);
free_msg:
nlmsg_free(msg);
return -EMSGSIZE;
}

static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,
u32 pid, u32 seq,
struct netlink_callback *cb,
int flags)
{
void *hdr;

nfc_dbg("entry");

hdr = genlmsg_put(msg, pid, seq, &nfc_genl_family, flags,
NFC_CMD_GET_DEVICE);
if (!hdr)
return -EMSGSIZE;

if (cb)
genl_dump_check_consistent(cb, hdr, &nfc_genl_family);

NLA_PUT_STRING(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev));
NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols);

return genlmsg_end(msg, hdr);

nla_put_failure:
genlmsg_cancel(msg, hdr);
return -EMSGSIZE;
}

static int nfc_genl_dump_devices(struct sk_buff *skb,
struct netlink_callback *cb)
{
struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
bool first_call = false;

nfc_dbg("entry");

if (!iter) {
first_call = true;
iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
if (!iter)
return -ENOMEM;
cb->args[0] = (long) iter;
}

mutex_lock(&nfc_devlist_mutex);

cb->seq = nfc_devlist_generation;

if (first_call) {
nfc_device_iter_init(iter);
dev = nfc_device_iter_next(iter);
}

while (dev) {
int rc;

rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq,
cb, NLM_F_MULTI);
if (rc < 0)
break;

dev = nfc_device_iter_next(iter);
}

mutex_unlock(&nfc_devlist_mutex);

cb->args[1] = (long) dev;

return skb->len;
}

static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
{
struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];

nfc_dbg("entry");

nfc_device_iter_exit(iter);
kfree(iter);

return 0;
}

static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
{
struct sk_buff *msg;
struct nfc_dev *dev;
u32 idx;
int rc = -ENOBUFS;

nfc_dbg("entry");

if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
return -EINVAL;

idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);

dev = nfc_get_device(idx);
if (!dev)
return -ENODEV;

msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
if (!msg) {
rc = -ENOMEM;
goto out_putdev;
}

rc = nfc_genl_send_device(msg, dev, info->snd_pid, info->snd_seq,
NULL, 0);
if (rc < 0)
goto out_free;

nfc_put_device(dev);

return genlmsg_reply(msg, info);

out_free:
nlmsg_free(msg);
out_putdev:
nfc_put_device(dev);
return rc;
}

static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info)
{
struct nfc_dev *dev;
int rc;
u32 idx;

nfc_dbg("entry");

if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
return -EINVAL;

idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);

dev = nfc_get_device(idx);
if (!dev)
return -ENODEV;

rc = nfc_dev_up(dev);

nfc_put_device(dev);
return rc;
}

static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info)
{
struct nfc_dev *dev;
int rc;
u32 idx;

nfc_dbg("entry");

if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
return -EINVAL;

idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);

dev = nfc_get_device(idx);
if (!dev)
return -ENODEV;

rc = nfc_dev_down(dev);

nfc_put_device(dev);
return rc;
}

static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
{
struct nfc_dev *dev;
int rc;
u32 idx;
u32 protocols;

nfc_dbg("entry");

if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
!info->attrs[NFC_ATTR_PROTOCOLS])
return -EINVAL;

idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);

dev = nfc_get_device(idx);
if (!dev)
return -ENODEV;

mutex_lock(&dev->genl_data.genl_data_mutex);

rc = nfc_start_poll(dev, protocols);
if (!rc)
dev->genl_data.poll_req_pid = info->snd_pid;

mutex_unlock(&dev->genl_data.genl_data_mutex);

nfc_put_device(dev);
return rc;
}

static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
{
struct nfc_dev *dev;
int rc;
u32 idx;

nfc_dbg("entry");

if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
return -EINVAL;

idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);

dev = nfc_get_device(idx);
if (!dev)
return -ENODEV;

mutex_lock(&dev->genl_data.genl_data_mutex);

if (dev->genl_data.poll_req_pid != info->snd_pid) {
rc = -EBUSY;
goto out;
}

rc = nfc_stop_poll(dev);
dev->genl_data.poll_req_pid = 0;

out:
mutex_unlock(&dev->genl_data.genl_data_mutex);
nfc_put_device(dev);
return rc;
}

static struct genl_ops nfc_genl_ops[] = {
{
.cmd = NFC_CMD_GET_DEVICE,
.doit = nfc_genl_get_device,
.dumpit = nfc_genl_dump_devices,
.done = nfc_genl_dump_devices_done,
.policy = nfc_genl_policy,
},
{
.cmd = NFC_CMD_DEV_UP,
.doit = nfc_genl_dev_up,
.policy = nfc_genl_policy,
},
{
.cmd = NFC_CMD_DEV_DOWN,
.doit = nfc_genl_dev_down,
.policy = nfc_genl_policy,
},
{
.cmd = NFC_CMD_START_POLL,
.doit = nfc_genl_start_poll,
.policy = nfc_genl_policy,
},
{
.cmd = NFC_CMD_STOP_POLL,
.doit = nfc_genl_stop_poll,
.policy = nfc_genl_policy,
},
{
.cmd = NFC_CMD_GET_TARGET,
.dumpit = nfc_genl_dump_targets,
.done = nfc_genl_dump_targets_done,
.policy = nfc_genl_policy,
},
};

static int nfc_genl_rcv_nl_event(struct notifier_block *this,
unsigned long event, void *ptr)
{
struct netlink_notify *n = ptr;
struct class_dev_iter iter;
struct nfc_dev *dev;

if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
goto out;

nfc_dbg("NETLINK_URELEASE event from id %d", n->pid);

nfc_device_iter_init(&iter);
dev = nfc_device_iter_next(&iter);

while (dev) {
mutex_lock(&dev->genl_data.genl_data_mutex);
if (dev->genl_data.poll_req_pid == n->pid) {
nfc_stop_poll(dev);
dev->genl_data.poll_req_pid = 0;
}
mutex_unlock(&dev->genl_data.genl_data_mutex);
dev = nfc_device_iter_next(&iter);
}

nfc_device_iter_exit(&iter);

out:
return NOTIFY_DONE;
}

void nfc_genl_data_init(struct nfc_genl_data *genl_data)
{
genl_data->poll_req_pid = 0;
mutex_init(&genl_data->genl_data_mutex);
}

void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
{
mutex_destroy(&genl_data->genl_data_mutex);
}

static struct notifier_block nl_notifier = {
.notifier_call = nfc_genl_rcv_nl_event,
};

/**
* nfc_genl_init() - Initialize netlink interface
*
* This initialization function registers the nfc netlink family.
*/
int __init nfc_genl_init(void)
{
int rc;

rc = genl_register_family_with_ops(&nfc_genl_family, nfc_genl_ops,
ARRAY_SIZE(nfc_genl_ops));
if (rc)
return rc;

rc = genl_register_mc_group(&nfc_genl_family, &nfc_genl_event_mcgrp);

netlink_register_notifier(&nl_notifier);

return rc;
}

/**
* nfc_genl_exit() - Deinitialize netlink interface
*
* This exit function unregisters the nfc netlink family.
*/
void nfc_genl_exit(void)
{
netlink_unregister_notifier(&nl_notifier);
genl_unregister_family(&nfc_genl_family);
}
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