path: root/drivers/nfc/nfcsim.c
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2017-06-23NFC: add NULL checks to avoid potential NULL pointer dereferenceGustavo A. R. Silva1-2/+4
NULL checks at line 457: if (!link0 || !link1) {, implies that both pointers link0 and link1 might be NULL. Function nfcsim_link_free() dereference pointers link0 and link1. Add NULL checks before calling nfcsim_link_free() to avoid a potential NULL pointer dereference. Addresses-Coverity-ID: 1364857 Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2016-07-19NFC: nfcsim: Simulate lost frames through debugfs entryThierry Escande1-0/+12
This patch allows to simulate the lost of frames exchanged between the 2 nfcsim devices through a control entry in the debugfs and is used as follow: echo n > /sys/kernel/debug/nfcsim/nfcX/dropframe Where n specifies the number of frames to be dropped between 0 and 255 and nfcX is either nfc0 or nfc1, one of the two nfcsim devices. In the following example, the next frame that should be sent by the nfc0 device will be dropped and thus not received by the nfc1 device: echo 1 > /sys/kernel/debug/nfcsim/nfc0/dropframe The value of 0 can be used to reset the dropframe counter. Signed-off-by: Thierry Escande <thierry.escande@collabora.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2016-07-19NFC: nfcsim: Add support for sysfs control entryThierry Escande1-0/+51
The idea is to have a way to control and/or modify the behavior of the nfcsim virtual devices. This patch creates a folder tree in the debug filesystem. The debugfs is usually mounted into /sys/kernel/debug and the nfcsim entries are located in DEBUGFS/nfcsim/nfcX/ where X is either 0 or 1 depending on the device you want to address. These folders are empty for now and control entries will be added by upcoming commits. Signed-off-by: Thierry Escande <thierry.escande@collabora.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2016-07-04NFC: nfcsim: Make use of the Digital layerThierry Escande1-354/+258
With this complete rewrite, the loopback nfcsim driver now relies on the Digital layer of the nfc stack. As with the previous version, 2 nfc devices are declared when the driver is initialized. The driver supports the NFC_DEP protocol in NFC-A and NFC-F technologies. The 2 devices are using a pair of virtual links for sk_buff exchange. The out-link of one device is the in-link of the other and conversely. To receive data, a device calls nfcsim_link_recv_skb() on its in-link and waits for incoming data on a wait queue. To send data, a device calls nfcsim_link_send_skb() on its out-link which stores the passed skb and signals its wait queue. If the peer device was in the nfcsim_link_recv_skb() call, it will be signaled and will be able to pass the received sk_buff up to the Digital layer. Signed-off-by: Thierry Escande <thierry.escande@collabora.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2015-12-21NFC: add rx delay sysfs parameter for nfcsim workqueueSaurabh Sengar1-3/+7
added the rx delay parameter as a device tunable parameter. Signed-off-by: Saurabh Sengar <saurabh.truth@gmail.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2015-10-27NFC: netlink: Add mode parameter to deactivate_target functionsChristophe Ricard1-1/+1
In order to manage in a better way the nci poll mode state machine, add mode parameter to deactivate_target functions. This way we can manage different target state. mode parameter make sense only in nci core. Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2013-09-25NFC: Convert nfc_dev_info and nfc_dev_err to nfc_<level>Joe Perches1-7/+7
Use a more standard kernel style macro logging name. Standardize the spacing of the "NFC: " prefix. Add \n to uses, remove from macro. Fix the defective uses that already had a \n. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2013-09-25NFC: Replace nfc_dev_dbg with dev_dbgJoe Perches1-12/+12
Use the generic kernel function instead of a home-grown one that does the same thing. Add \n to uses not at the macro. Don't add \n where the nfc_dev_dbg macro mistakenly had them already. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2013-08-14NFC: Fix missing static declarationsThierry Escande1-3/+3
This patch fixes 3 sparse warnings: nfcsim.c:63:25: sparse: symbol 'wq' was not declared. nfcsim.c:484:12: sparse: symbol 'nfcsim_init' was not declared. nfcsim.c:525:13: sparse: symbol 'nfcsim_exit' was not declared. Reported-by: Fengguang Wu <fengguang.wu@intel.com> Signed-off-by: Thierry Escande <thierry.escande@linux.intel.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2013-06-14NFC: Add a nfc hardware simulation driverThierry Escande1-0/+541
This driver declares two virtual NFC devices supporting NFC-DEP protocol. An LLCP connection can be established between them and all packets sent from one device is sent back to the other, acting as loopback devices. Once established, the LLCP link can be disconnected by disabling the target device (with rfkill, nfctool, or neard disable-adapter test script). Signed-off-by: Thierry Escande <thierry.escande@linux.intel.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

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