NFC: add nfc generic netlink interface
The NFC generic netlink interface exports the NFC control operations to the user space. Signed-off-by: Lauro Ramos Venancio <lauro.venancio@openbossa.org> Signed-off-by: Aloisio Almeida Jr <aloisio.almeida@openbossa.org> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com> Reviewed-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Lauro Ramos Venancio
John W. Linville
parent
3e256b8f8d
commit
4d12b8b129
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@ -0,0 +1,112 @@
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/*
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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, write to the
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* Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef __LINUX_NFC_H
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#define __LINUX_NFC_H
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#define NFC_GENL_NAME "nfc"
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#define NFC_GENL_VERSION 1
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#define NFC_GENL_MCAST_EVENT_NAME "events"
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/**
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* enum nfc_commands - supported nfc commands
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*
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* @NFC_CMD_UNSPEC: unspecified command
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*
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* @NFC_CMD_GET_DEVICE: request information about a device (requires
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* %NFC_ATTR_DEVICE_INDEX) or dump request to get a list of all nfc devices
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* @NFC_CMD_START_POLL: start polling for targets using the given protocols
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* (requires %NFC_ATTR_DEVICE_INDEX and %NFC_ATTR_PROTOCOLS)
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* @NFC_CMD_STOP_POLL: stop polling for targets (requires
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* %NFC_ATTR_DEVICE_INDEX)
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* @NFC_CMD_GET_TARGET: dump all targets found by the previous poll (requires
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* %NFC_ATTR_DEVICE_INDEX)
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* @NFC_EVENT_TARGETS_FOUND: event emitted when a new target is found
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* (it sends %NFC_ATTR_DEVICE_INDEX)
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* @NFC_EVENT_DEVICE_ADDED: event emitted when a new device is registred
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* (it sends %NFC_ATTR_DEVICE_NAME, %NFC_ATTR_DEVICE_INDEX and
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* %NFC_ATTR_PROTOCOLS)
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* @NFC_EVENT_DEVICE_REMOVED: event emitted when a device is removed
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* (it sends %NFC_ATTR_DEVICE_INDEX)
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*/
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enum nfc_commands {
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NFC_CMD_UNSPEC,
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NFC_CMD_GET_DEVICE,
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NFC_CMD_START_POLL,
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NFC_CMD_STOP_POLL,
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NFC_CMD_GET_TARGET,
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NFC_EVENT_TARGETS_FOUND,
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NFC_EVENT_DEVICE_ADDED,
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NFC_EVENT_DEVICE_REMOVED,
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/* private: internal use only */
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__NFC_CMD_AFTER_LAST
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};
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#define NFC_CMD_MAX (__NFC_CMD_AFTER_LAST - 1)
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/**
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* enum nfc_attrs - supported nfc attributes
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*
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* @NFC_ATTR_UNSPEC: unspecified attribute
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*
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* @NFC_ATTR_DEVICE_INDEX: index of nfc device
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* @NFC_ATTR_DEVICE_NAME: device name, max 8 chars
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* @NFC_ATTR_PROTOCOLS: nfc protocols - bitwise or-ed combination from
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* NFC_PROTO_*_MASK constants
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* @NFC_ATTR_TARGET_INDEX: index of the nfc target
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* @NFC_ATTR_TARGET_SENS_RES: NFC-A targets extra information such as NFCID
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* @NFC_ATTR_TARGET_SEL_RES: NFC-A targets extra information (useful if the
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* target is not NFC-Forum compliant)
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*/
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enum nfc_attrs {
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NFC_ATTR_UNSPEC,
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NFC_ATTR_DEVICE_INDEX,
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NFC_ATTR_DEVICE_NAME,
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NFC_ATTR_PROTOCOLS,
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NFC_ATTR_TARGET_INDEX,
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NFC_ATTR_TARGET_SENS_RES,
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NFC_ATTR_TARGET_SEL_RES,
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/* private: internal use only */
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__NFC_ATTR_AFTER_LAST
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};
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#define NFC_ATTR_MAX (__NFC_ATTR_AFTER_LAST - 1)
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#define NFC_DEVICE_NAME_MAXSIZE 8
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/* NFC protocols */
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#define NFC_PROTO_JEWEL 1
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#define NFC_PROTO_MIFARE 2
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#define NFC_PROTO_FELICA 3
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#define NFC_PROTO_ISO14443 4
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#define NFC_PROTO_NFC_DEP 5
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#define NFC_PROTO_MAX 6
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/* NFC protocols masks used in bitsets */
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#define NFC_PROTO_JEWEL_MASK (1 << NFC_PROTO_JEWEL)
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#define NFC_PROTO_MIFARE_MASK (1 << NFC_PROTO_MIFARE)
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#define NFC_PROTO_FELICA_MASK (1 << NFC_PROTO_FELICA)
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#define NFC_PROTO_ISO14443_MASK (1 << NFC_PROTO_ISO14443)
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#define NFC_PROTO_NFC_DEP_MASK (1 << NFC_PROTO_NFC_DEP)
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#endif /*__LINUX_NFC_H */
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@ -58,10 +58,28 @@ struct nfc_ops {
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void *cb_context);
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};
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struct nfc_target {
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u32 idx;
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u32 supported_protocols;
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u16 sens_res;
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u8 sel_res;
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};
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struct nfc_genl_data {
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u32 poll_req_pid;
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struct mutex genl_data_mutex;
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};
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struct nfc_dev {
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unsigned idx;
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unsigned target_idx;
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struct nfc_target *targets;
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int n_targets;
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int targets_generation;
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spinlock_t targets_lock;
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struct device dev;
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bool polling;
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struct nfc_genl_data genl_data;
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u32 supported_protocols;
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struct nfc_ops *ops;
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@ -132,4 +150,7 @@ static inline const char *nfc_device_name(struct nfc_dev *dev)
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struct sk_buff *nfc_alloc_skb(unsigned int size, gfp_t gfp);
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int nfc_targets_found(struct nfc_dev *dev, struct nfc_target *targets,
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int ntargets);
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#endif /* __NET_NFC_H */
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@ -4,4 +4,4 @@
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obj-$(CONFIG_NFC) += nfc.o
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nfc-objs := core.o
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nfc-objs := core.o netlink.o
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@ -233,12 +233,60 @@ struct sk_buff *nfc_alloc_skb(unsigned int size, gfp_t gfp)
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}
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EXPORT_SYMBOL(nfc_alloc_skb);
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/**
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* nfc_targets_found - inform that targets were found
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*
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* @dev: The nfc device that found the targets
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* @targets: array of nfc targets found
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* @ntargets: targets array size
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*
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* The device driver must call this function when one or many nfc targets
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* are found. After calling this function, the device driver must stop
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* polling for targets.
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*/
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int nfc_targets_found(struct nfc_dev *dev, struct nfc_target *targets,
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int n_targets)
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{
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int i;
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nfc_dbg("dev_name=%s n_targets=%d", dev_name(&dev->dev), n_targets);
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dev->polling = false;
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for (i = 0; i < n_targets; i++)
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targets[i].idx = dev->target_idx++;
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spin_lock_bh(&dev->targets_lock);
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dev->targets_generation++;
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kfree(dev->targets);
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dev->targets = kmemdup(targets, n_targets * sizeof(struct nfc_target),
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GFP_ATOMIC);
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if (!dev->targets) {
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dev->n_targets = 0;
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spin_unlock_bh(&dev->targets_lock);
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return -ENOMEM;
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}
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dev->n_targets = n_targets;
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spin_unlock_bh(&dev->targets_lock);
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nfc_genl_targets_found(dev);
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return 0;
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}
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EXPORT_SYMBOL(nfc_targets_found);
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static void nfc_release(struct device *d)
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{
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struct nfc_dev *dev = to_nfc_dev(d);
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nfc_dbg("dev_name=%s", dev_name(&dev->dev));
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nfc_genl_data_exit(&dev->genl_data);
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kfree(dev->targets);
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kfree(dev);
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}
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@ -298,6 +346,12 @@ struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
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dev->ops = ops;
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dev->supported_protocols = supported_protocols;
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spin_lock_init(&dev->targets_lock);
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nfc_genl_data_init(&dev->genl_data);
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/* first generation must not be 0 */
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dev->targets_generation = 1;
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return dev;
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}
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EXPORT_SYMBOL(nfc_allocate_device);
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@ -318,7 +372,16 @@ int nfc_register_device(struct nfc_dev *dev)
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rc = device_add(&dev->dev);
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mutex_unlock(&nfc_devlist_mutex);
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return rc;
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if (rc < 0)
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return rc;
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rc = nfc_genl_device_added(dev);
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if (rc)
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nfc_dbg("The userspace won't be notified that the device %s was"
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" added", dev_name(&dev->dev));
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return 0;
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}
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EXPORT_SYMBOL(nfc_register_device);
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@ -329,6 +392,8 @@ EXPORT_SYMBOL(nfc_register_device);
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*/
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void nfc_unregister_device(struct nfc_dev *dev)
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{
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int rc;
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nfc_dbg("dev_name=%s", dev_name(&dev->dev));
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mutex_lock(&nfc_devlist_mutex);
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@ -341,18 +406,42 @@ void nfc_unregister_device(struct nfc_dev *dev)
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device_unlock(&dev->dev);
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mutex_unlock(&nfc_devlist_mutex);
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rc = nfc_genl_device_removed(dev);
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if (rc)
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nfc_dbg("The userspace won't be notified that the device %s"
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" was removed", dev_name(&dev->dev));
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}
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EXPORT_SYMBOL(nfc_unregister_device);
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static int __init nfc_init(void)
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{
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int rc;
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nfc_info("NFC Core ver %s", VERSION);
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return class_register(&nfc_class);
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rc = class_register(&nfc_class);
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if (rc)
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return rc;
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rc = nfc_genl_init();
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if (rc)
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goto err_genl;
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/* the first generation must not be 0 */
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nfc_devlist_generation = 1;
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return 0;
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err_genl:
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class_unregister(&nfc_class);
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return rc;
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}
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static void __exit nfc_exit(void)
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{
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nfc_genl_exit();
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class_unregister(&nfc_class);
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}
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@ -0,0 +1,537 @@
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/*
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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, write to the
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* Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <net/genetlink.h>
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#include <linux/nfc.h>
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#include <linux/slab.h>
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#include "nfc.h"
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static struct genl_multicast_group nfc_genl_event_mcgrp = {
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.name = NFC_GENL_MCAST_EVENT_NAME,
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};
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struct genl_family nfc_genl_family = {
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.id = GENL_ID_GENERATE,
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.hdrsize = 0,
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.name = NFC_GENL_NAME,
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.version = NFC_GENL_VERSION,
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.maxattr = NFC_ATTR_MAX,
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};
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static const struct nla_policy nfc_genl_policy[NFC_ATTR_MAX + 1] = {
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[NFC_ATTR_DEVICE_INDEX] = { .type = NLA_U32 },
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[NFC_ATTR_DEVICE_NAME] = { .type = NLA_STRING,
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.len = NFC_DEVICE_NAME_MAXSIZE },
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[NFC_ATTR_PROTOCOLS] = { .type = NLA_U32 },
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};
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static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target,
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struct netlink_callback *cb, int flags)
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{
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void *hdr;
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nfc_dbg("entry");
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hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
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&nfc_genl_family, flags, NFC_CMD_GET_TARGET);
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if (!hdr)
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return -EMSGSIZE;
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genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
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NLA_PUT_U32(msg, NFC_ATTR_TARGET_INDEX, target->idx);
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NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS,
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target->supported_protocols);
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NLA_PUT_U16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res);
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NLA_PUT_U8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res);
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return genlmsg_end(msg, hdr);
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nla_put_failure:
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genlmsg_cancel(msg, hdr);
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return -EMSGSIZE;
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}
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static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
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{
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struct nfc_dev *dev;
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int rc;
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u32 idx;
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rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize,
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nfc_genl_family.attrbuf,
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nfc_genl_family.maxattr,
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nfc_genl_policy);
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if (rc < 0)
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return ERR_PTR(rc);
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if (!nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX])
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return ERR_PTR(-EINVAL);
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idx = nla_get_u32(nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX]);
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dev = nfc_get_device(idx);
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if (!dev)
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return ERR_PTR(-ENODEV);
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return dev;
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}
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|
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static int nfc_genl_dump_targets(struct sk_buff *skb,
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struct netlink_callback *cb)
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{
|
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int i = cb->args[0];
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struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
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int rc;
|
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|
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nfc_dbg("entry");
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if (!dev) {
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dev = __get_device_from_cb(cb);
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if (IS_ERR(dev))
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return PTR_ERR(dev);
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cb->args[1] = (long) dev;
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}
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spin_lock_bh(&dev->targets_lock);
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cb->seq = dev->targets_generation;
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while (i < dev->n_targets) {
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rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
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NLM_F_MULTI);
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if (rc < 0)
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break;
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i++;
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}
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spin_unlock_bh(&dev->targets_lock);
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cb->args[0] = i;
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return skb->len;
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}
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static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
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{
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struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
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|
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nfc_dbg("entry");
|
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|
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if (dev)
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nfc_put_device(dev);
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|
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return 0;
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}
|
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|
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int nfc_genl_targets_found(struct nfc_dev *dev)
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{
|
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struct sk_buff *msg;
|
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void *hdr;
|
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|
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nfc_dbg("entry");
|
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|
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dev->genl_data.poll_req_pid = 0;
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|
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msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
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if (!msg)
|
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return -ENOMEM;
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|
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hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
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NFC_EVENT_TARGETS_FOUND);
|
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if (!hdr)
|
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goto free_msg;
|
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|
||||
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_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_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);
|
||||
}
|
||||
|
|
@ -36,6 +36,17 @@ int nfc_printk(const char *level, const char *fmt, ...);
|
|||
extern int nfc_devlist_generation;
|
||||
extern struct mutex nfc_devlist_mutex;
|
||||
|
||||
int __init nfc_genl_init(void);
|
||||
void nfc_genl_exit(void);
|
||||
|
||||
void nfc_genl_data_init(struct nfc_genl_data *genl_data);
|
||||
void nfc_genl_data_exit(struct nfc_genl_data *genl_data);
|
||||
|
||||
int nfc_genl_targets_found(struct nfc_dev *dev);
|
||||
|
||||
int nfc_genl_device_added(struct nfc_dev *dev);
|
||||
int nfc_genl_device_removed(struct nfc_dev *dev);
|
||||
|
||||
struct nfc_dev *nfc_get_device(unsigned idx);
|
||||
|
||||
static inline void nfc_put_device(struct nfc_dev *dev)
|
||||
|
|
|
|||
Reference in New Issue