Merge tag 'nfc-next-3.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo/nfc-next

Samuel Ortiz <sameo@linux.intel.com> says:

"This is the first NFC patchset targeted at the 3.9 merge window.

It brings the following goodies:

- LLCP socket timestamping (To be used e.g with the recently released nfctool
  application for a more efficient skb timestamping when sniffing).
- A pretty big pn533 rework from Waldemar, preparing the driver to support
  more flavours of pn533 based devices.
- HCI changes from Eric in preparation for the microread driver support.
- Some LLCP memory leak fixes, cleanups and slight improvements.
- pn544 and nfcwilink move to the devm_kzalloc API.
- An initial Secure Element (SE) API.
- An nfc.h license change from the original author, allowing non GPL
  application code to safely include it."

Signed-off-by: John W. Linville <linville@tuxdriver.com>

24 files changed, 1199 insertions, 1023 deletions

diff --git a/Documentation/nfc/nfc-hci.txt b/Documentation/nfc/nfc-hci.txt
index 89a339c9b079..0686c9e211c2 100644
--- a/Documentation/nfc/nfc-hci.txt
+++ b/Documentation/nfc/nfc-hci.txt
@@ -17,10 +17,12 @@ HCI
 HCI registers as an nfc device with NFC Core. Requests coming from userspace are
 routed through netlink sockets to NFC Core and then to HCI. From this point,
 they are translated in a sequence of HCI commands sent to the HCI layer in the
-host controller (the chip). The sending context blocks while waiting for the
-response to arrive.
+host controller (the chip). Commands can be executed synchronously (the sending
+context blocks waiting for response) or asynchronously (the response is returned
+from HCI Rx context).
 HCI events can also be received from the host controller. They will be handled
-and a translation will be forwarded to NFC Core as needed.
+and a translation will be forwarded to NFC Core as needed. There are hooks to
+let the HCI driver handle proprietary events or override standard behavior.
 HCI uses 2 execution contexts:
 - one for executing commands : nfc_hci_msg_tx_work(). Only one command
 can be executing at any given moment.
@@ -33,6 +35,8 @@ The Session initialization is an HCI standard which must unfortunately
 support proprietary gates. This is the reason why the driver will pass a list
 of proprietary gates that must be part of the session. HCI will ensure all
 those gates have pipes connected when the hci device is set up.
+In case the chip supports pre-opened gates and pseudo-static pipes, the driver
+can pass that information to HCI core.
 
 HCI Gates and Pipes
 -------------------
@@ -46,6 +50,13 @@ without knowing the pipe connected to it.
 Driver interface
 ----------------
 
+A driver is generally written in two parts : the physical link management and
+the HCI management. This makes it easier to maintain a driver for a chip that
+can be connected using various phy (i2c, spi, ...)
+
+HCI Management
+--------------
+
 A driver would normally register itself with HCI and provide the following
 entry points:
 
@@ -53,58 +64,113 @@ struct nfc_hci_ops {
 	int (*open)(struct nfc_hci_dev *hdev);
 	void (*close)(struct nfc_hci_dev *hdev);
 	int (*hci_ready) (struct nfc_hci_dev *hdev);
-	int (*xmit)(struct nfc_hci_dev *hdev, struct sk_buff *skb);
-	int (*start_poll)(struct nfc_hci_dev *hdev, u32 protocols);
-	int (*target_from_gate)(struct nfc_hci_dev *hdev, u8 gate,
-				struct nfc_target *target);
+	int (*xmit) (struct nfc_hci_dev *hdev, struct sk_buff *skb);
+	int (*start_poll) (struct nfc_hci_dev *hdev,
+			   u32 im_protocols, u32 tm_protocols);
+	int (*dep_link_up)(struct nfc_hci_dev *hdev, struct nfc_target *target,
+			   u8 comm_mode, u8 *gb, size_t gb_len);
+	int (*dep_link_down)(struct nfc_hci_dev *hdev);
+	int (*target_from_gate) (struct nfc_hci_dev *hdev, u8 gate,
+				 struct nfc_target *target);
 	int (*complete_target_discovered) (struct nfc_hci_dev *hdev, u8 gate,
 					   struct nfc_target *target);
-	int (*data_exchange) (struct nfc_hci_dev *hdev,
-			      struct nfc_target *target,
-			      struct sk_buff *skb, struct sk_buff **res_skb);
+	int (*im_transceive) (struct nfc_hci_dev *hdev,
+			      struct nfc_target *target, struct sk_buff *skb,
+			      data_exchange_cb_t cb, void *cb_context);
+	int (*tm_send)(struct nfc_hci_dev *hdev, struct sk_buff *skb);
 	int (*check_presence)(struct nfc_hci_dev *hdev,
 			      struct nfc_target *target);
+	int (*event_received)(struct nfc_hci_dev *hdev, u8 gate, u8 event,
+			      struct sk_buff *skb);
 };
 
 - open() and close() shall turn the hardware on and off.
 - hci_ready() is an optional entry point that is called right after the hci
 session has been set up. The driver can use it to do additional initialization
 that must be performed using HCI commands.
-- xmit() shall simply write a frame to the chip.
+- xmit() shall simply write a frame to the physical link.
 - start_poll() is an optional entrypoint that shall set the hardware in polling
 mode. This must be implemented only if the hardware uses proprietary gates or a
 mechanism slightly different from the HCI standard.
+- dep_link_up() is called after a p2p target has been detected, to finish
+the p2p connection setup with hardware parameters that need to be passed back
+to nfc core.
+- dep_link_down() is called to bring the p2p link down.
 - target_from_gate() is an optional entrypoint to return the nfc protocols
 corresponding to a proprietary gate.
 - complete_target_discovered() is an optional entry point to let the driver
 perform additional proprietary processing necessary to auto activate the
 discovered target.
-- data_exchange() must be implemented by the driver if proprietary HCI commands
+- im_transceive() must be implemented by the driver if proprietary HCI commands
 are required to send data to the tag. Some tag types will require custom
 commands, others can be written to using the standard HCI commands. The driver
 can check the tag type and either do proprietary processing, or return 1 to ask
-for standard processing.
+for standard processing. The data exchange command itself must be sent
+asynchronously.
+- tm_send() is called to send data in the case of a p2p connection
 - check_presence() is an optional entry point that will be called regularly
 by the core to check that an activated tag is still in the field. If this is
 not implemented, the core will not be able to push tag_lost events to the user
 space
+- event_received() is called to handle an event coming from the chip. Driver
+can handle the event or return 1 to let HCI attempt standard processing.
 
 On the rx path, the driver is responsible to push incoming HCP frames to HCI
 using nfc_hci_recv_frame(). HCI will take care of re-aggregation and handling
 This must be done from a context that can sleep.
 
-SHDLC
------
+PHY Management
+--------------
+
+The physical link (i2c, ...) management is defined by the following struture:
+
+struct nfc_phy_ops {
+	int (*write)(void *dev_id, struct sk_buff *skb);
+	int (*enable)(void *dev_id);
+	void (*disable)(void *dev_id);
+};
+
+enable(): turn the phy on (power on), make it ready to transfer data
+disable(): turn the phy off
+write(): Send a data frame to the chip. Note that to enable higher
+layers such as an llc to store the frame for re-emission, this function must
+not alter the skb. It must also not return a positive result (return 0 for
+success, negative for failure).
+
+Data coming from the chip shall be sent directly to nfc_hci_recv_frame().
+
+LLC
+---
+
+Communication between the CPU and the chip often requires some link layer
+protocol. Those are isolated as modules managed by the HCI layer. There are
+currently two modules : nop (raw transfert) and shdlc.
+A new llc must implement the following functions:
+
+struct nfc_llc_ops {
+	void *(*init) (struct nfc_hci_dev *hdev, xmit_to_drv_t xmit_to_drv,
+		       rcv_to_hci_t rcv_to_hci, int tx_headroom,
+		       int tx_tailroom, int *rx_headroom, int *rx_tailroom,
+		       llc_failure_t llc_failure);
+	void (*deinit) (struct nfc_llc *llc);
+	int (*start) (struct nfc_llc *llc);
+	int (*stop) (struct nfc_llc *llc);
+	void (*rcv_from_drv) (struct nfc_llc *llc, struct sk_buff *skb);
+	int (*xmit_from_hci) (struct nfc_llc *llc, struct sk_buff *skb);
+};
+
+- init() : allocate and init your private storage
+- deinit() : cleanup
+- start() : establish the logical connection
+- stop () : terminate the logical connection
+- rcv_from_drv() : handle data coming from the chip, going to HCI
+- xmit_from_hci() : handle data sent by HCI, going to the chip
 
-Most chips use shdlc to ensure integrity and delivery ordering of the HCP
-frames between the host controller (the chip) and hosts (entities connected
-to the chip, like the cpu). In order to simplify writing the driver, an shdlc
-layer is available for use by the driver.
-When used, the driver actually registers with shdlc, and shdlc will register
-with HCI. HCI sees shdlc as the driver and thus send its HCP frames
-through shdlc->xmit.
-SHDLC adds a new execution context (nfc_shdlc_sm_work()) to run its state
-machine and handle both its rx and tx path.
+The llc must be registered with nfc before it can be used. Do that by
+calling nfc_llc_register(const char *name, struct nfc_llc_ops *ops);
+
+Again, note that the llc does not handle the physical link. It is thus very
+easy to mix any physical link with any llc for a given chip driver.
 
 Included Drivers
 ----------------
@@ -117,10 +183,12 @@ Execution Contexts
 
 The execution contexts are the following:
 - IRQ handler (IRQH):
-fast, cannot sleep. stores incoming frames into an shdlc rx queue
+fast, cannot sleep. sends incoming frames to HCI where they are passed to
+the current llc. In case of shdlc, the frame is queued in shdlc rx queue.
 
 - SHDLC State Machine worker (SMW)
-handles shdlc rx & tx queues. Dispatches HCI cmd responses.
+Only when llc_shdlc is used: handles shdlc rx & tx queues.
+Dispatches HCI cmd responses.
 
 - HCI Tx Cmd worker (MSGTXWQ)
 Serializes execution of HCI commands. Completes execution in case of response
@@ -166,6 +234,15 @@ waiting command execution. Response processing involves invoking the completion
 callback that was provided by nfc_hci_msg_tx_work() when it sent the command.
 The completion callback will then wake the syscall context.
 
+It is also possible to execute the command asynchronously using this API:
+
+static int nfc_hci_execute_cmd_async(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
+			       const u8 *param, size_t param_len,
+			       data_exchange_cb_t cb, void *cb_context)
+
+The workflow is the same, except that the API call returns immediately, and
+the callback will be called with the result from the SMW context.
+
 Workflow receiving an HCI event or command
 ------------------------------------------
 
diff --git a/Documentation/nfc/nfc-pn544.txt b/Documentation/nfc/nfc-pn544.txt
index 2fcac9f5996e..b36ca14ca2d6 100644
--- a/Documentation/nfc/nfc-pn544.txt
+++ b/Documentation/nfc/nfc-pn544.txt
@@ -1,32 +1,15 @@
 Kernel driver for the NXP Semiconductors PN544 Near Field
 Communication chip
 
-Author: Jari Vanhala
-Contact: Matti Aaltonen (matti.j.aaltonen at nokia.com)
-
 General
 -------
 
 The PN544 is an integrated transmission module for contactless
 communication. The driver goes under drives/nfc/ and is compiled as a
-module named "pn544". It registers a misc device and creates a device
-file named "/dev/pn544".
+module named "pn544".
 
 Host Interfaces: I2C, SPI and HSU, this driver supports currently only I2C.
 
-The Interface
--------------
-
-The driver offers a sysfs interface for a hardware test and an IOCTL
-interface for selecting between two operating modes. There are read,
-write and poll functions for transferring messages. The two operating
-modes are the normal (HCI) mode and the firmware update mode.
-
-PN544 is controlled by sending messages from the userspace to the
-chip. The main function of the driver is just to pass those messages
-without caring about the message content.
-
-
 Protocols
 ---------
 
@@ -47,68 +30,3 @@ and third (LSB) bytes of the message. The maximum FW message length is
 
 For the ETSI HCI specification see
 http://www.etsi.org/WebSite/Technologies/ProtocolSpecification.aspx
-
-The Hardware Test
------------------
-
-The idea of the test is that it can performed by reading from the
-corresponding sysfs file. The test is implemented in the board file
-and it should test that PN544 can be put into the firmware update
-mode. If the test is not implemented the sysfs file does not get
-created.
-
-Example:
-> cat /sys/module/pn544/drivers/i2c\:pn544/3-002b/nfc_test
-1
-
-Normal Operation
-----------------
-
-PN544 is powered up when the device file is opened, otherwise it's
-turned off. Only one instance can use the device at a time.
-
-Userspace applications control PN544 with HCI messages. The hardware
-sends an interrupt when data is available for reading. Data is
-physically read when the read function is called by a userspace
-application. Poll() checks the read interrupt state. Configuration and
-self testing are also done from the userspace using read and write.
-
-Example platform data:
-
-static int rx71_pn544_nfc_request_resources(struct i2c_client *client)
-{
-	/* Get and setup the HW resources for the device */
-}
-
-static void rx71_pn544_nfc_free_resources(void)
-{
-	/* Release the HW resources */
-}
-
-static void rx71_pn544_nfc_enable(int fw)
-{
-	/* Turn the device on */
-}
-
-static int rx71_pn544_nfc_test(void)
-{
-	/*
-	 * Put the device into the FW update mode
-	 * and then back to the normal mode.
-	 * Check the behavior and return one on success,
-	 * zero on failure.
-	 */
-}
-
-static void rx71_pn544_nfc_disable(void)
-{
-	/* turn the power off */
-}
-
-static struct pn544_nfc_platform_data rx71_nfc_data = {
-	.request_resources = rx71_pn544_nfc_request_resources,
-	.free_resources = rx71_pn544_nfc_free_resources,
-	.enable = rx71_pn544_nfc_enable,
-	.test = rx71_pn544_nfc_test,
-	.disable = rx71_pn544_nfc_disable,
-};
diff --git a/drivers/nfc/Kconfig b/drivers/nfc/Kconfig
index ec857676c39f..80c728b28828 100644
--- a/drivers/nfc/Kconfig
+++ b/drivers/nfc/Kconfig
@@ -5,19 +5,6 @@
 menu "Near Field Communication (NFC) devices"
 	depends on NFC
 
-config PN544_HCI_NFC
-	tristate "HCI PN544 NFC driver"
-	depends on I2C && NFC_HCI && NFC_SHDLC
-	select CRC_CCITT
-	default n
-	---help---
-	  NXP PN544 i2c driver.
-	  This is a driver based on the SHDLC and HCI NFC kernel layers and
-	  will thus not work with NXP libnfc library.
-
-	  To compile this driver as a module, choose m here. The module will
-	  be called pn544_hci.
-
 config NFC_PN533
 	tristate "NXP PN533 USB driver"
 	depends on USB
@@ -39,4 +26,6 @@ config NFC_WILINK
 	  Say Y here to compile support for Texas Instrument's NFC WiLink driver
 	  into the kernel or say M to compile it as module.
 
+source "drivers/nfc/pn544/Kconfig"
+
 endmenu
diff --git a/drivers/nfc/Makefile b/drivers/nfc/Makefile
index 36c359043f54..574bbc04d97a 100644
--- a/drivers/nfc/Makefile
+++ b/drivers/nfc/Makefile
@@ -2,7 +2,7 @@
 # Makefile for nfc devices
 #
 
-obj-$(CONFIG_PN544_HCI_NFC)	+= pn544/
+obj-$(CONFIG_NFC_PN544)		+= pn544/
 obj-$(CONFIG_NFC_PN533)		+= pn533.o
 obj-$(CONFIG_NFC_WILINK)	+= nfcwilink.o
 
diff --git a/drivers/nfc/nfcwilink.c b/drivers/nfc/nfcwilink.c
index c7c182d2b7df..3b731acbc408 100644
--- a/drivers/nfc/nfcwilink.c
+++ b/drivers/nfc/nfcwilink.c
@@ -542,6 +542,7 @@ static int nfcwilink_probe(struct platform_device *pdev)
 
 	drv->ndev = nci_allocate_device(&nfcwilink_ops,
 					protocols,
+					NFC_SE_NONE,
 					NFCWILINK_HDR_LEN,
 					0);
 	if (!drv->ndev) {
diff --git a/drivers/nfc/pn533.c b/drivers/nfc/pn533.c
index ada681b01a17..f696318cfb51 100644
--- a/drivers/nfc/pn533.c
+++ b/drivers/nfc/pn533.c
@@ -41,11 +41,6 @@
 #define SONY_VENDOR_ID         0x054c
 #define PASORI_PRODUCT_ID      0x02e1
 
-#define PN533_QUIRKS_TYPE_A          BIT(0)
-#define PN533_QUIRKS_TYPE_F          BIT(1)
-#define PN533_QUIRKS_DEP             BIT(2)
-#define PN533_QUIRKS_RAW_EXCHANGE    BIT(3)
-
 #define PN533_DEVICE_STD    0x1
 #define PN533_DEVICE_PASORI 0x2
 
@@ -84,14 +79,18 @@ MODULE_DEVICE_TABLE(usb, pn533_table);
 #define PN533_LISTEN_TIME 2
 
 /* frame definitions */
-#define PN533_NORMAL_FRAME_MAX_LEN 262  /* 6   (PREAMBLE, SOF, LEN, LCS, TFI)
-					   254 (DATA)
-					   2   (DCS, postamble) */
-
-#define PN533_FRAME_TAIL_SIZE 2
-#define PN533_FRAME_SIZE(f) (sizeof(struct pn533_frame) + f->datalen + \
-				PN533_FRAME_TAIL_SIZE)
-#define PN533_FRAME_ACK_SIZE (sizeof(struct pn533_frame) + 1)
+#define PN533_FRAME_HEADER_LEN (sizeof(struct pn533_frame) \
+					+ 2) /* data[0] TFI, data[1] CC */
+#define PN533_FRAME_TAIL_LEN 2 /* data[len] DCS, data[len + 1] postamble*/
+
+/*
+ * Max extended frame payload len, excluding TFI and CC
+ * which are already in PN533_FRAME_HEADER_LEN.
+ */
+#define PN533_FRAME_MAX_PAYLOAD_LEN 263
+
+#define PN533_FRAME_ACK_SIZE 6 /* Preamble (1), SoPC (2), ACK Code (2),
+				  Postamble (1) */
 #define PN533_FRAME_CHECKSUM(f) (f->data[f->datalen])
 #define PN533_FRAME_POSTAMBLE(f) (f->data[f->datalen + 1])
 
@@ -105,8 +104,6 @@ MODULE_DEVICE_TABLE(usb, pn533_table);
 
 /* PN533 Commands */
 #define PN533_FRAME_CMD(f) (f->data[1])
-#define PN533_FRAME_CMD_PARAMS_PTR(f) (&f->data[2])
-#define PN533_FRAME_CMD_PARAMS_LEN(f) (f->datalen - 2)
 
 #define PN533_CMD_GET_FIRMWARE_VERSION 0x02
 #define PN533_CMD_RF_CONFIGURATION 0x32
@@ -120,6 +117,7 @@ MODULE_DEVICE_TABLE(usb, pn533_table);
 #define PN533_CMD_TG_INIT_AS_TARGET 0x8c
 #define PN533_CMD_TG_GET_DATA 0x86
 #define PN533_CMD_TG_SET_DATA 0x8e
+#define PN533_CMD_UNDEF 0xff
 
 #define PN533_CMD_RESPONSE(cmd) (cmd + 1)
 
@@ -128,13 +126,12 @@ MODULE_DEVICE_TABLE(usb, pn533_table);
 #define PN533_CMD_MI_MASK 0x40
 #define PN533_CMD_RET_SUCCESS 0x00
 
-/* PN533 status codes */
-#define PN533_STATUS_TARGET_RELEASED 0x29
-
 struct pn533;
 
-typedef int (*pn533_cmd_complete_t) (struct pn533 *dev, void *arg,
-					u8 *params, int params_len);
+typedef int (*pn533_cmd_complete_t) (struct pn533 *dev, void *arg, int status);
+
+typedef int (*pn533_send_async_complete_t) (struct pn533 *dev, void *arg,
+					struct sk_buff *resp);
 
 /* structs for pn533 commands */
 
@@ -282,11 +279,6 @@ const struct pn533_poll_modulations poll_mod[] = {
 
 /* PN533_CMD_IN_ATR */
 
-struct pn533_cmd_activate_param {
-	u8 tg;
-	u8 next;
-} __packed;
-
 struct pn533_cmd_activate_response {
 	u8 status;
 	u8 nfcid3t[10];
@@ -299,14 +291,6 @@ struct pn533_cmd_activate_response {
 	u8 gt[];
 } __packed;
 
-/* PN533_CMD_IN_JUMP_FOR_DEP */
-struct pn533_cmd_jump_dep {
-	u8 active;
-	u8 baud;
-	u8 next;
-	u8 data[];
-} __packed;
-
 struct pn533_cmd_jump_dep_response {
 	u8 status;
 	u8 tg;
@@ -329,32 +313,13 @@ struct pn533_cmd_jump_dep_response {
 #define PN533_INIT_TARGET_RESP_ACTIVE     0x1
 #define PN533_INIT_TARGET_RESP_DEP        0x4
 
-struct pn533_cmd_init_target {
-	u8 mode;
-	u8 mifare[6];
-	u8 felica[18];
-	u8 nfcid3[10];
-	u8 gb_len;
-	u8 gb[];
-} __packed;
-
-struct pn533_cmd_init_target_response {
-	u8 mode;
-	u8 cmd[];
-} __packed;
-
 struct pn533 {
 	struct usb_device *udev;
 	struct usb_interface *interface;
 	struct nfc_dev *nfc_dev;
 
 	struct urb *out_urb;
-	int out_maxlen;
-	struct pn533_frame *out_frame;
-
 	struct urb *in_urb;
-	int in_maxlen;
-	struct pn533_frame *in_frame;
 
 	struct sk_buff_head resp_q;
 
@@ -365,12 +330,12 @@ struct pn533 {
 	struct work_struct mi_work;
 	struct work_struct tg_work;
 	struct timer_list listen_timer;
-	struct pn533_frame *wq_in_frame;
 	int wq_in_error;
 	int cancel_listen;
 
 	pn533_cmd_complete_t cmd_complete;
 	void *cmd_complete_arg;
+	void *cmd_complete_mi_arg;
 	struct mutex cmd_lock;
 	u8 cmd;
 
@@ -391,16 +356,17 @@ struct pn533 {
 
 	struct list_head cmd_queue;
 	u8 cmd_pending;
+
+	struct pn533_frame_ops *ops;
 };
 
 struct pn533_cmd {
 	struct list_head queue;
-	struct pn533_frame *out_frame;
-	struct pn533_frame *in_frame;
-	int in_frame_len;
-	pn533_cmd_complete_t cmd_complete;
+	u8 cmd_code;
+	struct sk_buff *req;
+	struct sk_buff *resp;
+	int resp_len;
 	void *arg;
-	gfp_t flags;
 };
 
 struct pn533_frame {
@@ -411,6 +377,22 @@ struct pn533_frame {
 	u8 data[];
 } __packed;
 
+struct pn533_frame_ops {
+	void (*tx_frame_init)(void *frame, u8 cmd_code);
+	void (*tx_frame_finish)(void *frame);
+	void (*tx_update_payload_len)(void *frame, int len);
+	int tx_header_len;
+	int tx_tail_len;
+
+	bool (*rx_is_frame_valid)(void *frame);
+	int (*rx_frame_size)(void *frame);
+	int rx_header_len;
+	int rx_tail_len;
+
+	int max_payload_len;
+	u8 (*get_cmd_code)(void *frame);
+};
+
 /* The rule: value + checksum = 0 */
 static inline u8 pn533_checksum(u8 value)
 {
@@ -429,37 +411,21 @@ static u8 pn533_data_checksum(u8 *data, int datalen)
 	return pn533_checksum(sum);
 }
 
-/**
- * pn533_tx_frame_ack - create a ack frame
- * @frame:	The frame to be set as ack
- *
- * Ack is different type of standard frame. As a standard frame, it has
- * preamble and start_frame. However the checksum of this frame must fail,
- * i.e. datalen + datalen_checksum must NOT be zero. When the checksum test
- * fails and datalen = 0 and datalen_checksum = 0xFF, the frame is a ack.
- * After datalen_checksum field, the postamble is placed.
- */
-static void pn533_tx_frame_ack(struct pn533_frame *frame)
+static void pn533_tx_frame_init(void *_frame, u8 cmd_code)
 {
-	frame->preamble = 0;
-	frame->start_frame = cpu_to_be16(PN533_SOF);
-	frame->datalen = 0;
-	frame->datalen_checksum = 0xFF;
-	/* data[0] is used as postamble */
-	frame->data[0] = 0;
-}
+	struct pn533_frame *frame = _frame;
 
-static void pn533_tx_frame_init(struct pn533_frame *frame, u8 cmd)
-{
 	frame->preamble = 0;
 	frame->start_frame = cpu_to_be16(PN533_SOF);
 	PN533_FRAME_IDENTIFIER(frame) = PN533_DIR_OUT;
-	PN533_FRAME_CMD(frame) = cmd;
+	PN533_FRAME_CMD(frame) = cmd_code;
 	frame->datalen = 2;
 }
 
-static void pn533_tx_frame_finish(struct pn533_frame *frame)
+static void pn533_tx_frame_finish(void *_frame)
 {
+	struct pn533_frame *frame = _frame;
+
 	frame->datalen_checksum = pn533_checksum(frame->datalen);
 
 	PN533_FRAME_CHECKSUM(frame) =
@@ -468,9 +434,17 @@ static void pn533_tx_frame_finish(struct pn533_frame *frame)
 	PN533_FRAME_POSTAMBLE(frame) = 0;
 }
 
-static bool pn533_rx_frame_is_valid(struct pn533_frame *frame)
+static void pn533_tx_update_payload_len(void *_frame, int len)
+{
+	struct pn533_frame *frame = _frame;
+
+	frame->datalen += len;
+}
+
+static bool pn533_rx_frame_is_valid(void *_frame)
 {
 	u8 checksum;
+	struct pn533_frame *frame = _frame;
 
 	if (frame->start_frame != cpu_to_be16(PN533_SOF))
 		return false;
@@ -497,28 +471,48 @@ static bool pn533_rx_frame_is_ack(struct pn533_frame *frame)
 	return true;
 }
 
-static bool pn533_rx_frame_is_cmd_response(struct pn533_frame *frame, u8 cmd)
+static inline int pn533_rx_frame_size(void *frame)
+{
+	struct pn533_frame *f = frame;
+
+	return sizeof(struct pn533_frame) + f->datalen + PN533_FRAME_TAIL_LEN;
+}
+
+static u8 pn533_get_cmd_code(void *frame)
+{
+	struct pn533_frame *f = frame;
+
+	return PN533_FRAME_CMD(f);
+}
+
+struct pn533_frame_ops pn533_std_frame_ops = {
+	.tx_frame_init = pn533_tx_frame_init,
+	.tx_frame_finish = pn533_tx_frame_finish,
+	.tx_update_payload_len = pn533_tx_update_payload_len,
+	.tx_header_len = PN533_FRAME_HEADER_LEN,
+	.tx_tail_len = PN533_FRAME_TAIL_LEN,
+
+	.rx_is_frame_valid = pn533_rx_frame_is_valid,
+	.rx_frame_size = pn533_rx_frame_size,
+	.rx_header_len = PN533_FRAME_HEADER_LEN,
+	.rx_tail_len = PN533_FRAME_TAIL_LEN,
+
+	.max_payload_len =  PN533_FRAME_MAX_PAYLOAD_LEN,
+	.get_cmd_code = pn533_get_cmd_code,
+};
+
+static bool pn533_rx_frame_is_cmd_response(struct pn533 *dev, void *frame)
 {
-	return (PN533_FRAME_CMD(frame) == PN533_CMD_RESPONSE(cmd));
+	return (dev->ops->get_cmd_code(frame) == PN533_CMD_RESPONSE(dev->cmd));
 }
 
 
 static void pn533_wq_cmd_complete(struct work_struct *work)
 {
 	struct pn533 *dev = container_of(work, struct pn533, cmd_complete_work);
-	struct pn533_frame *in_frame;
 	int rc;
 
-	in_frame = dev->wq_in_frame;
-
-	if (dev->wq_in_error)
-		rc = dev->cmd_complete(dev, dev->cmd_complete_arg, NULL,
-							dev->wq_in_error);
-	else
-		rc = dev->cmd_complete(dev, dev->cmd_complete_arg,
-					PN533_FRAME_CMD_PARAMS_PTR(in_frame),
-					PN533_FRAME_CMD_PARAMS_LEN(in_frame));
-
+	rc = dev->cmd_complete(dev, dev->cmd_complete_arg, dev->wq_in_error);
 	if (rc != -EINPROGRESS)
 		queue_work(dev->wq, &dev->cmd_work);
 }
@@ -526,46 +520,47 @@ static void pn533_wq_cmd_complete(struct work_struct *work)
 static void pn533_recv_response(struct urb *urb)
 {
 	struct pn533 *dev = urb->context;
-	struct pn533_frame *in_frame;
-
-	dev->wq_in_frame = NULL;
+	u8 *in_frame;
 
 	switch (urb->status) {
 	case 0:
-		/* success */
-		break;
+		break; /* success */
 	case -ECONNRESET:
 	case -ENOENT:
-	case -ESHUTDOWN:
-		nfc_dev_dbg(&dev->interface->dev, "Urb shutting down with"
-						" status: %d", urb->status);
+		nfc_dev_dbg(&dev->interface->dev,
+			    "The urb has been canceled (status %d)",
+			    urb->status);
 		dev->wq_in_error = urb->status;
 		goto sched_wq;
+		break;
+	case -ESHUTDOWN:
 	default:
-		nfc_dev_err(&dev->interface->dev, "Nonzero urb status received:"
-							" %d", urb->status);
+		nfc_dev_err(&dev->interface->dev,
+			    "Urb failure (status %d)", urb->status);
 		dev->wq_in_error = urb->status;
 		goto sched_wq;
 	}
 
 	in_frame = dev->in_urb->transfer_buffer;
 
-	if (!pn533_rx_frame_is_valid(in_frame)) {
+	nfc_dev_dbg(&dev->interface->dev, "Received a frame.");
+	print_hex_dump(KERN_DEBUG, "PN533 RX: ", DUMP_PREFIX_NONE, 16, 1,
+		       in_frame, dev->ops->rx_frame_size(in_frame), false);
+
+	if (!dev->ops->rx_is_frame_valid(in_frame)) {
 		nfc_dev_err(&dev->interface->dev, "Received an invalid frame");
 		dev->wq_in_error = -EIO;
 		goto sched_wq;
 	}
 
-	if (!pn533_rx_frame_is_cmd_response(in_frame, dev->cmd)) {
-		nfc_dev_err(&dev->interface->dev, "The received frame is not "
-						"response to the last command");
+	if (!pn533_rx_frame_is_cmd_response(dev, in_frame)) {
+		nfc_dev_err(&dev->interface->dev,
+			    "It it not the response to the last command");
 		dev->wq_in_error = -EIO;
 		goto sched_wq;
 	}
 
-	nfc_dev_dbg(&dev->interface->dev, "Received a valid frame");
 	dev->wq_in_error = 0;
-	dev->wq_in_frame = in_frame;
 
 sched_wq:
 	queue_work(dev->wq, &dev->cmd_complete_work);
@@ -586,18 +581,19 @@ static void pn533_recv_ack(struct urb *urb)
 
 	switch (urb->status) {
 	case 0:
-		/* success */
-		break;
+		break; /* success */
 	case -ECONNRESET:
 	case -ENOENT:
-	case -ESHUTDOWN:
-		nfc_dev_dbg(&dev->interface->dev, "Urb shutting down with"
-						" status: %d", urb->status);
+		nfc_dev_dbg(&dev->interface->dev,
+			    "The urb has been stopped (status %d)",
+			    urb->status);
 		dev->wq_in_error = urb->status;
 		goto sched_wq;
+		break;
+	case -ESHUTDOWN:
 	default:
-		nfc_dev_err(&dev->interface->dev, "Nonzero urb status received:"
-							" %d", urb->status);
+		nfc_dev_err(&dev->interface->dev,
+			    "Urb failure (status %d)", urb->status);
 		dev->wq_in_error = urb->status;
 		goto sched_wq;
 	}
@@ -610,12 +606,10 @@ static void pn533_recv_ack(struct urb *urb)
 		goto sched_wq;
 	}
 
-	nfc_dev_dbg(&dev->interface->dev, "Received a valid ack");
-
 	rc = pn533_submit_urb_for_response(dev, GFP_ATOMIC);
 	if (rc) {
-		nfc_dev_err(&dev->interface->dev, "usb_submit_urb failed with"
-							" result %d", rc);
+		nfc_dev_err(&dev->interface->dev,
+			    "usb_submit_urb failed with result %d", rc);
 		dev->wq_in_error = rc;
 		goto sched_wq;
 	}
@@ -623,7 +617,6 @@ static void pn533_recv_ack(struct urb *urb)
 	return;
 
 sched_wq:
-	dev->wq_in_frame = NULL;
 	queue_work(dev->wq, &dev->cmd_complete_work);
 }
 
@@ -636,47 +629,46 @@ static int pn533_submit_urb_for_ack(struct pn533 *dev, gfp_t flags)
 
 static int pn533_send_ack(struct pn533 *dev, gfp_t flags)
 {
+	u8 ack[PN533_FRAME_ACK_SIZE] = {0x00, 0x00, 0xff, 0x00, 0xff, 0x00};
+	/* spec 7.1.1.3:  Preamble, SoPC (2), ACK Code (2), Postamble */
 	int rc;
 
 	nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
 
-	pn533_tx_frame_ack(dev->out_frame);
-
-	dev->out_urb->transfer_buffer = dev->out_frame;
-	dev->out_urb->transfer_buffer_length = PN533_FRAME_ACK_SIZE;
+	dev->out_urb->transfer_buffer = ack;
+	dev->out_urb->transfer_buffer_length = sizeof(ack);
 	rc = usb_submit_urb(dev->out_urb, flags);
 
 	return rc;
 }
 
-static int __pn533_send_cmd_frame_async(struct pn533 *dev,
-					struct pn533_frame *out_frame,
-					struct pn533_frame *in_frame,
-					int in_frame_len,
+static int __pn533_send_frame_async(struct pn533 *dev,
+					struct sk_buff *out,
+					struct sk_buff *in,
+					int in_len,
 					pn533_cmd_complete_t cmd_complete,
-					void *arg, gfp_t flags)
+					void *arg)
 {
 	int rc;
 
-	nfc_dev_dbg(&dev->interface->dev, "Sending command 0x%x",
-						PN533_FRAME_CMD(out_frame));
-
-	dev->cmd = PN533_FRAME_CMD(out_frame);
+	dev->cmd = dev->ops->get_cmd_code(out->data);
 	dev->cmd_complete = cmd_complete;
 	dev->cmd_complete_arg = arg;
 
-	dev->out_urb->transfer_buffer = out_frame;
-	dev->out_urb->transfer_buffer_length =
-				PN533_FRAME_SIZE(out_frame);
+	dev->out_urb->transfer_buffer = out->data;
+	dev->out_urb->transfer_buffer_length = out->len;
 
-	dev->in_urb->transfer_buffer = in_frame;
-	dev->in_urb->transfer_buffer_length = in_frame_len;
+	dev->in_urb->transfer_buffer = in->data;
+	dev->in_urb->transfer_buffer_length = in_len;
 
-	rc = usb_submit_urb(dev->out_urb, flags);
+	print_hex_dump(KERN_DEBUG, "PN533 TX: ", DUMP_PREFIX_NONE, 16, 1,
+		       out->data, out->len, false);
+
+	rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);