Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 721 insertions, 0 deletions

diff --git a/drivers/nfc/microread/microread.c b/drivers/nfc/microread/microread.c
new file mode 100644
index 000000000..bb4d029bb
--- /dev/null
+++ b/drivers/nfc/microread/microread.c
@@ -0,0 +1,721 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * HCI based Driver for Inside Secure microread NFC Chip
+ *
+ * Copyright (C) 2013  Intel Corporation. All rights reserved.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/crc-ccitt.h>
+
+#include <linux/nfc.h>
+#include <net/nfc/nfc.h>
+#include <net/nfc/hci.h>
+
+#include "microread.h"
+
+/* Proprietary gates, events, commands and registers */
+/* Admin */
+#define MICROREAD_GATE_ID_ADM NFC_HCI_ADMIN_GATE
+#define MICROREAD_GATE_ID_MGT 0x01
+#define MICROREAD_GATE_ID_OS 0x02
+#define MICROREAD_GATE_ID_TESTRF 0x03
+#define MICROREAD_GATE_ID_LOOPBACK NFC_HCI_LOOPBACK_GATE
+#define MICROREAD_GATE_ID_IDT NFC_HCI_ID_MGMT_GATE
+#define MICROREAD_GATE_ID_LMS NFC_HCI_LINK_MGMT_GATE
+
+/* Reader */
+#define MICROREAD_GATE_ID_MREAD_GEN 0x10
+#define MICROREAD_GATE_ID_MREAD_ISO_B NFC_HCI_RF_READER_B_GATE
+#define MICROREAD_GATE_ID_MREAD_NFC_T1 0x12
+#define MICROREAD_GATE_ID_MREAD_ISO_A NFC_HCI_RF_READER_A_GATE
+#define MICROREAD_GATE_ID_MREAD_NFC_T3 0x14
+#define MICROREAD_GATE_ID_MREAD_ISO_15_3 0x15
+#define MICROREAD_GATE_ID_MREAD_ISO_15_2 0x16
+#define MICROREAD_GATE_ID_MREAD_ISO_B_3 0x17
+#define MICROREAD_GATE_ID_MREAD_BPRIME 0x18
+#define MICROREAD_GATE_ID_MREAD_ISO_A_3 0x19
+
+/* Card */
+#define MICROREAD_GATE_ID_MCARD_GEN 0x20
+#define MICROREAD_GATE_ID_MCARD_ISO_B 0x21
+#define MICROREAD_GATE_ID_MCARD_BPRIME 0x22
+#define MICROREAD_GATE_ID_MCARD_ISO_A 0x23
+#define MICROREAD_GATE_ID_MCARD_NFC_T3 0x24
+#define MICROREAD_GATE_ID_MCARD_ISO_15_3 0x25
+#define MICROREAD_GATE_ID_MCARD_ISO_15_2 0x26
+#define MICROREAD_GATE_ID_MCARD_ISO_B_2 0x27
+#define MICROREAD_GATE_ID_MCARD_ISO_CUSTOM 0x28
+#define MICROREAD_GATE_ID_SECURE_ELEMENT 0x2F
+
+/* P2P */
+#define MICROREAD_GATE_ID_P2P_GEN 0x30
+#define MICROREAD_GATE_ID_P2P_TARGET 0x31
+#define MICROREAD_PAR_P2P_TARGET_MODE 0x01
+#define MICROREAD_PAR_P2P_TARGET_GT 0x04
+#define MICROREAD_GATE_ID_P2P_INITIATOR 0x32
+#define MICROREAD_PAR_P2P_INITIATOR_GI 0x01
+#define MICROREAD_PAR_P2P_INITIATOR_GT 0x03
+
+/* Those pipes are created/opened by default in the chip */
+#define MICROREAD_PIPE_ID_LMS 0x00
+#define MICROREAD_PIPE_ID_ADMIN 0x01
+#define MICROREAD_PIPE_ID_MGT 0x02
+#define MICROREAD_PIPE_ID_OS 0x03
+#define MICROREAD_PIPE_ID_HDS_LOOPBACK 0x04
+#define MICROREAD_PIPE_ID_HDS_IDT 0x05
+#define MICROREAD_PIPE_ID_HDS_MCARD_ISO_B 0x08
+#define MICROREAD_PIPE_ID_HDS_MCARD_ISO_BPRIME 0x09
+#define MICROREAD_PIPE_ID_HDS_MCARD_ISO_A 0x0A
+#define MICROREAD_PIPE_ID_HDS_MCARD_ISO_15_3 0x0B
+#define MICROREAD_PIPE_ID_HDS_MCARD_ISO_15_2 0x0C
+#define MICROREAD_PIPE_ID_HDS_MCARD_NFC_T3 0x0D
+#define MICROREAD_PIPE_ID_HDS_MCARD_ISO_B_2 0x0E
+#define MICROREAD_PIPE_ID_HDS_MCARD_CUSTOM 0x0F
+#define MICROREAD_PIPE_ID_HDS_MREAD_ISO_B 0x10
+#define MICROREAD_PIPE_ID_HDS_MREAD_NFC_T1 0x11
+#define MICROREAD_PIPE_ID_HDS_MREAD_ISO_A 0x12
+#define MICROREAD_PIPE_ID_HDS_MREAD_ISO_15_3 0x13
+#define MICROREAD_PIPE_ID_HDS_MREAD_ISO_15_2 0x14
+#define MICROREAD_PIPE_ID_HDS_MREAD_NFC_T3 0x15
+#define MICROREAD_PIPE_ID_HDS_MREAD_ISO_B_3 0x16
+#define MICROREAD_PIPE_ID_HDS_MREAD_BPRIME 0x17
+#define MICROREAD_PIPE_ID_HDS_MREAD_ISO_A_3 0x18
+#define MICROREAD_PIPE_ID_HDS_MREAD_GEN 0x1B
+#define MICROREAD_PIPE_ID_HDS_STACKED_ELEMENT 0x1C
+#define MICROREAD_PIPE_ID_HDS_INSTANCES 0x1D
+#define MICROREAD_PIPE_ID_HDS_TESTRF 0x1E
+#define MICROREAD_PIPE_ID_HDS_P2P_TARGET 0x1F
+#define MICROREAD_PIPE_ID_HDS_P2P_INITIATOR 0x20
+
+/* Events */
+#define MICROREAD_EVT_MREAD_DISCOVERY_OCCURED NFC_HCI_EVT_TARGET_DISCOVERED
+#define MICROREAD_EVT_MREAD_CARD_FOUND 0x3D
+#define MICROREAD_EMCF_A_ATQA 0
+#define MICROREAD_EMCF_A_SAK 2
+#define MICROREAD_EMCF_A_LEN 3
+#define MICROREAD_EMCF_A_UID 4
+#define MICROREAD_EMCF_A3_ATQA 0
+#define MICROREAD_EMCF_A3_SAK 2
+#define MICROREAD_EMCF_A3_LEN 3
+#define MICROREAD_EMCF_A3_UID 4
+#define MICROREAD_EMCF_B_UID 0
+#define MICROREAD_EMCF_T1_ATQA 0
+#define MICROREAD_EMCF_T1_UID 4
+#define MICROREAD_EMCF_T3_UID 0
+#define MICROREAD_EVT_MREAD_DISCOVERY_START NFC_HCI_EVT_READER_REQUESTED
+#define MICROREAD_EVT_MREAD_DISCOVERY_START_SOME 0x3E
+#define MICROREAD_EVT_MREAD_DISCOVERY_STOP NFC_HCI_EVT_END_OPERATION
+#define MICROREAD_EVT_MREAD_SIM_REQUESTS 0x3F
+#define MICROREAD_EVT_MCARD_EXCHANGE NFC_HCI_EVT_TARGET_DISCOVERED
+#define MICROREAD_EVT_P2P_INITIATOR_EXCHANGE_TO_RF 0x20
+#define MICROREAD_EVT_P2P_INITIATOR_EXCHANGE_FROM_RF 0x21
+#define MICROREAD_EVT_MCARD_FIELD_ON 0x11
+#define MICROREAD_EVT_P2P_TARGET_ACTIVATED 0x13
+#define MICROREAD_EVT_P2P_TARGET_DEACTIVATED 0x12
+#define MICROREAD_EVT_MCARD_FIELD_OFF 0x14
+
+/* Commands */
+#define MICROREAD_CMD_MREAD_EXCHANGE 0x10
+#define MICROREAD_CMD_MREAD_SUBSCRIBE 0x3F
+
+/* Hosts IDs */
+#define MICROREAD_ELT_ID_HDS NFC_HCI_TERMINAL_HOST_ID
+#define MICROREAD_ELT_ID_SIM NFC_HCI_UICC_HOST_ID
+#define MICROREAD_ELT_ID_SE1 0x03
+#define MICROREAD_ELT_ID_SE2 0x04
+#define MICROREAD_ELT_ID_SE3 0x05
+
+static const struct nfc_hci_gate microread_gates[] = {
+	{MICROREAD_GATE_ID_ADM, MICROREAD_PIPE_ID_ADMIN},
+	{MICROREAD_GATE_ID_LOOPBACK, MICROREAD_PIPE_ID_HDS_LOOPBACK},
+	{MICROREAD_GATE_ID_IDT, MICROREAD_PIPE_ID_HDS_IDT},
+	{MICROREAD_GATE_ID_LMS, MICROREAD_PIPE_ID_LMS},
+	{MICROREAD_GATE_ID_MREAD_ISO_B, MICROREAD_PIPE_ID_HDS_MREAD_ISO_B},
+	{MICROREAD_GATE_ID_MREAD_ISO_A, MICROREAD_PIPE_ID_HDS_MREAD_ISO_A},
+	{MICROREAD_GATE_ID_MREAD_ISO_A_3, MICROREAD_PIPE_ID_HDS_MREAD_ISO_A_3},
+	{MICROREAD_GATE_ID_MGT, MICROREAD_PIPE_ID_MGT},
+	{MICROREAD_GATE_ID_OS, MICROREAD_PIPE_ID_OS},
+	{MICROREAD_GATE_ID_MREAD_NFC_T1, MICROREAD_PIPE_ID_HDS_MREAD_NFC_T1},
+	{MICROREAD_GATE_ID_MREAD_NFC_T3, MICROREAD_PIPE_ID_HDS_MREAD_NFC_T3},
+	{MICROREAD_GATE_ID_P2P_TARGET, MICROREAD_PIPE_ID_HDS_P2P_TARGET},
+	{MICROREAD_GATE_ID_P2P_INITIATOR, MICROREAD_PIPE_ID_HDS_P2P_INITIATOR}
+};
+
+/* Largest headroom needed for outgoing custom commands */
+#define MICROREAD_CMDS_HEADROOM	2
+#define MICROREAD_CMD_TAILROOM	2
+
+struct microread_info {
+	const struct nfc_phy_ops *phy_ops;
+	void *phy_id;
+
+	struct nfc_hci_dev *hdev;
+
+	int async_cb_type;
+	data_exchange_cb_t async_cb;
+	void *async_cb_context;
+};
+
+static int microread_open(struct nfc_hci_dev *hdev)
+{
+	struct microread_info *info = nfc_hci_get_clientdata(hdev);
+
+	return info->phy_ops->enable(info->phy_id);
+}
+
+static void microread_close(struct nfc_hci_dev *hdev)
+{
+	struct microread_info *info = nfc_hci_get_clientdata(hdev);
+
+	info->phy_ops->disable(info->phy_id);
+}
+
+static int microread_hci_ready(struct nfc_hci_dev *hdev)
+{
+	int r;
+	u8 param[4];
+
+	param[0] = 0x03;
+	r = nfc_hci_send_cmd(hdev, MICROREAD_GATE_ID_MREAD_ISO_A,
+			     MICROREAD_CMD_MREAD_SUBSCRIBE, param, 1, NULL);
+	if (r)
+		return r;
+
+	r = nfc_hci_send_cmd(hdev, MICROREAD_GATE_ID_MREAD_ISO_A_3,
+			     MICROREAD_CMD_MREAD_SUBSCRIBE, NULL, 0, NULL);
+	if (r)
+		return r;
+
+	param[0] = 0x00;
+	param[1] = 0x03;
+	param[2] = 0x00;
+	r = nfc_hci_send_cmd(hdev, MICROREAD_GATE_ID_MREAD_ISO_B,
+			     MICROREAD_CMD_MREAD_SUBSCRIBE, param, 3, NULL);
+	if (r)
+		return r;
+
+	r = nfc_hci_send_cmd(hdev, MICROREAD_GATE_ID_MREAD_NFC_T1,
+			     MICROREAD_CMD_MREAD_SUBSCRIBE, NULL, 0, NULL);
+	if (r)
+		return r;
+
+	param[0] = 0xFF;
+	param[1] = 0xFF;
+	param[2] = 0x00;
+	param[3] = 0x00;
+	r = nfc_hci_send_cmd(hdev, MICROREAD_GATE_ID_MREAD_NFC_T3,
+			     MICROREAD_CMD_MREAD_SUBSCRIBE, param, 4, NULL);
+
+	return r;
+}
+
+static int microread_xmit(struct nfc_hci_dev *hdev, struct sk_buff *skb)
+{
+	struct microread_info *info = nfc_hci_get_clientdata(hdev);
+
+	return info->phy_ops->write(info->phy_id, skb);
+}
+
+static int microread_start_poll(struct nfc_hci_dev *hdev,
+				u32 im_protocols, u32 tm_protocols)
+{
+	int r;
+
+	u8 param[2];
+	u8 mode;
+
+	param[0] = 0x00;
+	param[1] = 0x00;
+
+	if (im_protocols & NFC_PROTO_ISO14443_MASK)
+		param[0] |= (1 << 2);
+
+	if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
+		param[0] |= 1;
+
+	if (im_protocols & NFC_PROTO_MIFARE_MASK)
+		param[1] |= 1;
+
+	if (im_protocols & NFC_PROTO_JEWEL_MASK)
+		param[0] |= (1 << 1);
+
+	if (im_protocols & NFC_PROTO_FELICA_MASK)
+		param[0] |= (1 << 5);
+
+	if (im_protocols & NFC_PROTO_NFC_DEP_MASK)
+		param[1] |= (1 << 1);
+
+	if ((im_protocols | tm_protocols) & NFC_PROTO_NFC_DEP_MASK) {
+		hdev->gb = nfc_get_local_general_bytes(hdev->ndev,
+						       &hdev->gb_len);
+		if (hdev->gb == NULL || hdev->gb_len == 0) {
+			im_protocols &= ~NFC_PROTO_NFC_DEP_MASK;
+			tm_protocols &= ~NFC_PROTO_NFC_DEP_MASK;
+		}
+	}
+
+	r = nfc_hci_send_event(hdev, MICROREAD_GATE_ID_MREAD_ISO_A,
+			       MICROREAD_EVT_MREAD_DISCOVERY_STOP, NULL, 0);
+	if (r)
+		return r;
+
+	mode = 0xff;
+	r = nfc_hci_set_param(hdev, MICROREAD_GATE_ID_P2P_TARGET,
+			      MICROREAD_PAR_P2P_TARGET_MODE, &mode, 1);
+	if (r)
+		return r;
+
+	if (im_protocols & NFC_PROTO_NFC_DEP_MASK) {
+		r = nfc_hci_set_param(hdev, MICROREAD_GATE_ID_P2P_INITIATOR,
+				      MICROREAD_PAR_P2P_INITIATOR_GI,
+				      hdev->gb, hdev->gb_len);
+		if (r)
+			return r;
+	}
+
+	if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
+		r = nfc_hci_set_param(hdev, MICROREAD_GATE_ID_P2P_TARGET,
+				      MICROREAD_PAR_P2P_TARGET_GT,
+				      hdev->gb, hdev->gb_len);
+		if (r)
+			return r;
+
+		mode = 0x02;
+		r = nfc_hci_set_param(hdev, MICROREAD_GATE_ID_P2P_TARGET,
+				      MICROREAD_PAR_P2P_TARGET_MODE, &mode, 1);
+		if (r)
+			return r;
+	}
+
+	return nfc_hci_send_event(hdev, MICROREAD_GATE_ID_MREAD_ISO_A,
+				  MICROREAD_EVT_MREAD_DISCOVERY_START_SOME,
+				  param, 2);
+}
+
+static int microread_dep_link_up(struct nfc_hci_dev *hdev,
+				struct nfc_target *target, u8 comm_mode,
+				u8 *gb, size_t gb_len)
+{
+	struct sk_buff *rgb_skb = NULL;
+	int r;
+
+	r = nfc_hci_get_param(hdev, target->hci_reader_gate,
+			      MICROREAD_PAR_P2P_INITIATOR_GT, &rgb_skb);
+	if (r < 0)
+		return r;
+
+	if (rgb_skb->len == 0 || rgb_skb->len > NFC_GB_MAXSIZE) {
+		r = -EPROTO;
+		goto exit;
+	}
+
+	r = nfc_set_remote_general_bytes(hdev->ndev, rgb_skb->data,
+					 rgb_skb->len);
+	if (r == 0)
+		r = nfc_dep_link_is_up(hdev->ndev, target->idx, comm_mode,
+				       NFC_RF_INITIATOR);
+exit:
+	kfree_skb(rgb_skb);
+
+	return r;
+}
+
+static int microread_dep_link_down(struct nfc_hci_dev *hdev)
+{
+	return nfc_hci_send_event(hdev, MICROREAD_GATE_ID_P2P_INITIATOR,
+				  MICROREAD_EVT_MREAD_DISCOVERY_STOP, NULL, 0);
+}
+
+static int microread_target_from_gate(struct nfc_hci_dev *hdev, u8 gate,
+				      struct nfc_target *target)
+{
+	switch (gate) {
+	case MICROREAD_GATE_ID_P2P_INITIATOR:
+		target->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
+		break;
+	default:
+		return -EPROTO;
+	}
+
+	return 0;
+}
+
+static int microread_complete_target_discovered(struct nfc_hci_dev *hdev,
+						u8 gate,
+						struct nfc_target *target)
+{
+	return 0;
+}
+
+#define MICROREAD_CB_TYPE_READER_ALL 1
+
+static void microread_im_transceive_cb(void *context, struct sk_buff *skb,
+				       int err)
+{
+	const struct microread_info *info = context;
+
+	switch (info->async_cb_type) {
+	case MICROREAD_CB_TYPE_READER_ALL:
+		if (err == 0) {
+			if (skb->len == 0) {
+				kfree_skb(skb);
+				info->async_cb(info->async_cb_context, NULL,
+					       -EPROTO);
+				return;
+			}
+
+			if (skb->data[skb->len - 1] != 0) {
+				err = nfc_hci_result_to_errno(
+						       skb->data[skb->len - 1]);
+				kfree_skb(skb);
+				info->async_cb(info->async_cb_context, NULL,
+					       err);
+				return;
+			}
+
+			skb_trim(skb, skb->len - 1);	/* RF Error ind. */
+		}
+		info->async_cb(info->async_cb_context, skb, err);
+		break;
+	default:
+		if (err == 0)
+			kfree_skb(skb);
+		break;
+	}
+}
+
+/*
+ * Returns:
+ * <= 0: driver handled the data exchange
+ *    1: driver doesn't especially handle, please do standard processing
+ */
+static int microread_im_transceive(struct nfc_hci_dev *hdev,
+				   struct nfc_target *target,
+				   struct sk_buff *skb, data_exchange_cb_t cb,
+				   void *cb_context)
+{
+	struct microread_info *info = nfc_hci_get_clientdata(hdev);
+	u8 control_bits;
+	u16 crc;
+
+	pr_info("data exchange to gate 0x%x\n", target->hci_reader_gate);
+
+	if (target->hci_reader_gate == MICROREAD_GATE_ID_P2P_INITIATOR) {
+		*(u8 *)skb_push(skb, 1) = 0;
+
+		return nfc_hci_send_event(hdev, target->hci_reader_gate,
+				     MICROREAD_EVT_P2P_INITIATOR_EXCHANGE_TO_RF,
+				     skb->data, skb->len);
+	}
+
+	switch (target->hci_reader_gate) {
+	case MICROREAD_GATE_ID_MREAD_ISO_A:
+		control_bits = 0xCB;
+		break;
+	case MICROREAD_GATE_ID_MREAD_ISO_A_3:
+		control_bits = 0xCB;
+		break;
+	case MICROREAD_GATE_ID_MREAD_ISO_B:
+		control_bits = 0xCB;
+		break;
+	case MICROREAD_GATE_ID_MREAD_NFC_T1:
+		control_bits = 0x1B;
+
+		crc = crc_ccitt(0xffff, skb->data, skb->len);
+		crc = ~crc;
+		skb_put_u8(skb, crc & 0xff);
+		skb_put_u8(skb, crc >> 8);
+		break;
+	case MICROREAD_GATE_ID_MREAD_NFC_T3:
+		control_bits = 0xDB;
+		break;
+	default:
+		pr_info("Abort im_transceive to invalid gate 0x%x\n",
+			target->hci_reader_gate);
+		return 1;
+	}
+
+	*(u8 *)skb_push(skb, 1) = control_bits;
+
+	info->async_cb_type = MICROREAD_CB_TYPE_READER_ALL;
+	info->async_cb = cb;
+	info->async_cb_context = cb_context;
+
+	return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
+				      MICROREAD_CMD_MREAD_EXCHANGE,
+				      skb->data, skb->len,
+				      microread_im_transceive_cb, info);
+}
+
+static int microread_tm_send(struct nfc_hci_dev *hdev, struct sk_buff *skb)
+{
+	int r;
+
+	r = nfc_hci_send_event(hdev, MICROREAD_GATE_ID_P2P_TARGET,
+			       MICROREAD_EVT_MCARD_EXCHANGE,
+			       skb->data, skb->len);
+
+	kfree_skb(skb);
+
+	return r;
+}
+
+static void microread_target_discovered(struct nfc_hci_dev *hdev, u8 gate,
+					struct sk_buff *skb)
+{
+	struct nfc_target *targets;
+	int r = 0;
+
+	pr_info("target discovered to gate 0x%x\n", gate);
+
+	targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
+	if (targets == NULL) {
+		r = -ENOMEM;
+		goto exit;
+	}
+
+	targets->hci_reader_gate = gate;
+
+	switch (gate) {
+	case MICROREAD_GATE_ID_MREAD_ISO_A:
+		targets->supported_protocols =
+		      nfc_hci_sak_to_protocol(skb->data[MICROREAD_EMCF_A_SAK]);
+		targets->sens_res =
+			 be16_to_cpu(*(u16 *)&skb->data[MICROREAD_EMCF_A_ATQA]);
+		targets->sel_res = skb->data[MICROREAD_EMCF_A_SAK];
+		targets->nfcid1_len = skb->data[MICROREAD_EMCF_A_LEN];
+		if (targets->nfcid1_len > sizeof(targets->nfcid1)) {
+			r = -EINVAL;
+			goto exit_free;
+		}
+		memcpy(targets->nfcid1, &skb->data[MICROREAD_EMCF_A_UID],
+		       targets->nfcid1_len);
+		break;
+	case MICROREAD_GATE_ID_MREAD_ISO_A_3:
+		targets->supported_protocols =
+		      nfc_hci_sak_to_protocol(skb->data[MICROREAD_EMCF_A3_SAK]);
+		targets->sens_res =
+			 be16_to_cpu(*(u16 *)&skb->data[MICROREAD_EMCF_A3_ATQA]);
+		targets->sel_res = skb->data[MICROREAD_EMCF_A3_SAK];
+		targets->nfcid1_len = skb->data[MICROREAD_EMCF_A3_LEN];
+		if (targets->nfcid1_len > sizeof(targets->nfcid1)) {
+			r = -EINVAL;
+			goto exit_free;
+		}
+		memcpy(targets->nfcid1, &skb->data[MICROREAD_EMCF_A3_UID],
+		       targets->nfcid1_len);
+		break;
+	case MICROREAD_GATE_ID_MREAD_ISO_B:
+		targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
+		memcpy(targets->nfcid1, &skb->data[MICROREAD_EMCF_B_UID], 4);
+		targets->nfcid1_len = 4;
+		break;
+	case MICROREAD_GATE_ID_MREAD_NFC_T1:
+		targets->supported_protocols = NFC_PROTO_JEWEL_MASK;
+		targets->sens_res =
+			le16_to_cpu(*(u16 *)&skb->data[MICROREAD_EMCF_T1_ATQA]);
+		memcpy(targets->nfcid1, &skb->data[MICROREAD_EMCF_T1_UID], 4);
+		targets->nfcid1_len = 4;
+		break;
+	case MICROREAD_GATE_ID_MREAD_NFC_T3:
+		targets->supported_protocols = NFC_PROTO_FELICA_MASK;
+		memcpy(targets->nfcid1, &skb->data[MICROREAD_EMCF_T3_UID], 8);
+		targets->nfcid1_len = 8;
+		break;
+	default:
+		pr_info("discard target discovered to gate 0x%x\n", gate);
+		goto exit_free;
+	}
+
+	r = nfc_targets_found(hdev->ndev, targets, 1);
+
+exit_free:
+	kfree(targets);
+
+exit:
+	kfree_skb(skb);
+
+	if (r)
+		pr_err("Failed to handle discovered target err=%d\n", r);
+}
+
+static int microread_event_received(struct nfc_hci_dev *hdev, u8 pipe,
+				     u8 event, struct sk_buff *skb)
+{
+	int r;
+	u8 gate = hdev->pipes[pipe].gate;
+	u8 mode;
+
+	pr_info("Microread received event 0x%x to gate 0x%x\n", event, gate);
+
+	switch (event) {
+	case MICROREAD_EVT_MREAD_CARD_FOUND:
+		microread_target_discovered(hdev, gate, skb);
+		return 0;
+
+	case MICROREAD_EVT_P2P_INITIATOR_EXCHANGE_FROM_RF:
+		if (skb->len < 1) {
+			kfree_skb(skb);
+			return -EPROTO;
+		}
+
+		if (skb->data[skb->len - 1]) {
+			kfree_skb(skb);
+			return -EIO;
+		}
+
+		skb_trim(skb, skb->len - 1);
+
+		r = nfc_tm_data_received(hdev->ndev, skb);
+		break;
+
+	case MICROREAD_EVT_MCARD_FIELD_ON:
+	case MICROREAD_EVT_MCARD_FIELD_OFF:
+		kfree_skb(skb);
+		return 0;
+
+	case MICROREAD_EVT_P2P_TARGET_ACTIVATED:
+		r = nfc_tm_activated(hdev->ndev, NFC_PROTO_NFC_DEP_MASK,
+				     NFC_COMM_PASSIVE, skb->data,
+				     skb->len);
+
+		kfree_skb(skb);
+		break;
+
+	case MICROREAD_EVT_MCARD_EXCHANGE:
+		if (skb->len < 1) {
+			kfree_skb(skb);
+			return -EPROTO;
+		}
+
+		if (skb->data[skb->len-1]) {
+			kfree_skb(skb);
+			return -EIO;
+		}
+
+		skb_trim(skb, skb->len - 1);
+
+		r = nfc_tm_data_received(hdev->ndev, skb);
+		break;
+
+	case MICROREAD_EVT_P2P_TARGET_DEACTIVATED:
+		kfree_skb(skb);
+
+		mode = 0xff;
+		r = nfc_hci_set_param(hdev, MICROREAD_GATE_ID_P2P_TARGET,
+				      MICROREAD_PAR_P2P_TARGET_MODE, &mode, 1);
+		if (r)
+			break;
+
+		r = nfc_hci_send_event(hdev, gate,
+				       MICROREAD_EVT_MREAD_DISCOVERY_STOP, NULL,
+				       0);
+		break;
+
+	default:
+		return 1;
+	}
+
+	return r;
+}
+
+static const struct nfc_hci_ops microread_hci_ops = {
+	.open = microread_open,
+	.close = microread_close,
+	.hci_ready = microread_hci_ready,
+	.xmit = microread_xmit,
+	.start_poll = microread_start_poll,
+	.dep_link_up = microread_dep_link_up,
+	.dep_link_down = microread_dep_link_down,
+	.target_from_gate = microread_target_from_gate,
+	.complete_target_discovered = microread_complete_target_discovered,
+	.im_transceive = microread_im_transceive,
+	.tm_send = microread_tm_send,
+	.check_presence = NULL,
+	.event_received = microread_event_received,
+};
+
+int microread_probe(void *phy_id, const struct nfc_phy_ops *phy_ops,
+		    const char *llc_name, int phy_headroom, int phy_tailroom,
+		    int phy_payload, struct nfc_hci_dev **hdev)
+{
+	struct microread_info *info;
+	unsigned long quirks = 0;
+	u32 protocols;
+	struct nfc_hci_init_data init_data;
+	int r;
+
+	info = kzalloc(sizeof(struct microread_info), GFP_KERNEL);
+	if (!info) {
+		r = -ENOMEM;
+		goto err_info_alloc;
+	}
+
+	info->phy_ops = phy_ops;
+	info->phy_id = phy_id;
+
+	init_data.gate_count = ARRAY_SIZE(microread_gates);
+	memcpy(init_data.gates, microread_gates, sizeof(microread_gates));
+
+	strcpy(init_data.session_id, "MICROREA");
+
+	set_bit(NFC_HCI_QUIRK_SHORT_CLEAR, &quirks);
+
+	protocols = NFC_PROTO_JEWEL_MASK |
+		    NFC_PROTO_MIFARE_MASK |
+		    NFC_PROTO_FELICA_MASK |
+		    NFC_PROTO_ISO14443_MASK |
+		    NFC_PROTO_ISO14443_B_MASK |
+		    NFC_PROTO_NFC_DEP_MASK;
+
+	info->hdev = nfc_hci_allocate_device(&microread_hci_ops, &init_data,
+					     quirks, protocols, llc_name,
+					     phy_headroom +
+					     MICROREAD_CMDS_HEADROOM,
+					     phy_tailroom +
+					     MICROREAD_CMD_TAILROOM,
+					     phy_payload);
+	if (!info->hdev) {
+		pr_err("Cannot allocate nfc hdev\n");
+		r = -ENOMEM;
+		goto err_alloc_hdev;
+	}
+
+	nfc_hci_set_clientdata(info->hdev, info);
+
+	r = nfc_hci_register_device(info->hdev);
+	if (r)
+		goto err_regdev;
+
+	*hdev = info->hdev;
+
+	return 0;
+
+err_regdev:
+	nfc_hci_free_device(info->hdev);
+
+err_alloc_hdev:
+	kfree(info);
+
+err_info_alloc:
+	return r;
+}
+EXPORT_SYMBOL(microread_probe);
+
+void microread_remove(struct nfc_hci_dev *hdev)
+{
+	struct microread_info *info = nfc_hci_get_clientdata(hdev);
+
+	nfc_hci_unregister_device(hdev);
+	nfc_hci_free_device(hdev);
+	kfree(info);
+}
+EXPORT_SYMBOL(microread_remove);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION(DRIVER_DESC);