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, 573 insertions, 0 deletions

diff --git a/drivers/usb/serial/kobil_sct.c b/drivers/usb/serial/kobil_sct.c
new file mode 100644
index 000000000..5e775f68f
--- /dev/null
+++ b/drivers/usb/serial/kobil_sct.c
@@ -0,0 +1,573 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  KOBIL USB Smart Card Terminal Driver
+ *
+ *  Copyright (C) 2002  KOBIL Systems GmbH
+ *  Author: Thomas Wahrenbruch
+ *
+ *  Contact: linuxusb@kobil.de
+ *
+ *  This program is largely derived from work by the linux-usb group
+ *  and associated source files.  Please see the usb/serial files for
+ *  individual credits and copyrights.
+ *
+ *  Thanks to Greg Kroah-Hartman (greg@kroah.com) for his help and
+ *  patience.
+ *
+ * Supported readers: USB TWIN, KAAN Standard Plus and SecOVID Reader Plus
+ * (Adapter K), B1 Professional and KAAN Professional (Adapter B)
+ */
+
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/uaccess.h>
+#include <linux/usb.h>
+#include <linux/usb/serial.h>
+#include <linux/ioctl.h>
+#include "kobil_sct.h"
+
+#define DRIVER_AUTHOR "KOBIL Systems GmbH - http://www.kobil.com"
+#define DRIVER_DESC "KOBIL USB Smart Card Terminal Driver (experimental)"
+
+#define KOBIL_VENDOR_ID			0x0D46
+#define KOBIL_ADAPTER_B_PRODUCT_ID	0x2011
+#define KOBIL_ADAPTER_K_PRODUCT_ID	0x2012
+#define KOBIL_USBTWIN_PRODUCT_ID	0x0078
+#define KOBIL_KAAN_SIM_PRODUCT_ID       0x0081
+
+#define KOBIL_TIMEOUT		500
+#define KOBIL_BUF_LENGTH	300
+
+
+/* Function prototypes */
+static int kobil_port_probe(struct usb_serial_port *probe);
+static void kobil_port_remove(struct usb_serial_port *probe);
+static int  kobil_open(struct tty_struct *tty, struct usb_serial_port *port);
+static void kobil_close(struct usb_serial_port *port);
+static int  kobil_write(struct tty_struct *tty, struct usb_serial_port *port,
+			 const unsigned char *buf, int count);
+static unsigned int kobil_write_room(struct tty_struct *tty);
+static int  kobil_ioctl(struct tty_struct *tty,
+			unsigned int cmd, unsigned long arg);
+static int  kobil_tiocmget(struct tty_struct *tty);
+static int  kobil_tiocmset(struct tty_struct *tty,
+			   unsigned int set, unsigned int clear);
+static void kobil_read_int_callback(struct urb *urb);
+static void kobil_write_int_callback(struct urb *urb);
+static void kobil_set_termios(struct tty_struct *tty,
+			      struct usb_serial_port *port,
+			      const struct ktermios *old);
+static void kobil_init_termios(struct tty_struct *tty);
+
+static const struct usb_device_id id_table[] = {
+	{ USB_DEVICE(KOBIL_VENDOR_ID, KOBIL_ADAPTER_B_PRODUCT_ID) },
+	{ USB_DEVICE(KOBIL_VENDOR_ID, KOBIL_ADAPTER_K_PRODUCT_ID) },
+	{ USB_DEVICE(KOBIL_VENDOR_ID, KOBIL_USBTWIN_PRODUCT_ID) },
+	{ USB_DEVICE(KOBIL_VENDOR_ID, KOBIL_KAAN_SIM_PRODUCT_ID) },
+	{ }			/* Terminating entry */
+};
+MODULE_DEVICE_TABLE(usb, id_table);
+
+static struct usb_serial_driver kobil_device = {
+	.driver = {
+		.owner =	THIS_MODULE,
+		.name =		"kobil",
+	},
+	.description =		"KOBIL USB smart card terminal",
+	.id_table =		id_table,
+	.num_ports =		1,
+	.num_interrupt_out =	1,
+	.port_probe =		kobil_port_probe,
+	.port_remove =		kobil_port_remove,
+	.ioctl =		kobil_ioctl,
+	.set_termios =		kobil_set_termios,
+	.init_termios =		kobil_init_termios,
+	.tiocmget =		kobil_tiocmget,
+	.tiocmset =		kobil_tiocmset,
+	.open =			kobil_open,
+	.close =		kobil_close,
+	.write =		kobil_write,
+	.write_room =		kobil_write_room,
+	.read_int_callback =	kobil_read_int_callback,
+	.write_int_callback =	kobil_write_int_callback,
+};
+
+static struct usb_serial_driver * const serial_drivers[] = {
+	&kobil_device, NULL
+};
+
+struct kobil_private {
+	unsigned char buf[KOBIL_BUF_LENGTH]; /* buffer for the APDU to send */
+	int filled;  /* index of the last char in buf */
+	int cur_pos; /* index of the next char to send in buf */
+	__u16 device_type;
+};
+
+
+static int kobil_port_probe(struct usb_serial_port *port)
+{
+	struct usb_serial *serial = port->serial;
+	struct kobil_private *priv;
+
+	priv = kmalloc(sizeof(struct kobil_private), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->filled = 0;
+	priv->cur_pos = 0;
+	priv->device_type = le16_to_cpu(serial->dev->descriptor.idProduct);
+
+	switch (priv->device_type) {
+	case KOBIL_ADAPTER_B_PRODUCT_ID:
+		dev_dbg(&serial->dev->dev, "KOBIL B1 PRO / KAAN PRO detected\n");
+		break;
+	case KOBIL_ADAPTER_K_PRODUCT_ID:
+		dev_dbg(&serial->dev->dev, "KOBIL KAAN Standard Plus / SecOVID Reader Plus detected\n");
+		break;
+	case KOBIL_USBTWIN_PRODUCT_ID:
+		dev_dbg(&serial->dev->dev, "KOBIL USBTWIN detected\n");
+		break;
+	case KOBIL_KAAN_SIM_PRODUCT_ID:
+		dev_dbg(&serial->dev->dev, "KOBIL KAAN SIM detected\n");
+		break;
+	}
+	usb_set_serial_port_data(port, priv);
+
+	return 0;
+}
+
+
+static void kobil_port_remove(struct usb_serial_port *port)
+{
+	struct kobil_private *priv;
+
+	priv = usb_get_serial_port_data(port);
+	kfree(priv);
+}
+
+static void kobil_init_termios(struct tty_struct *tty)
+{
+	/* Default to echo off and other sane device settings */
+	tty->termios.c_lflag = 0;
+	tty->termios.c_iflag &= ~(ISIG | ICANON | ECHO | IEXTEN | XCASE);
+	tty->termios.c_iflag |= IGNBRK | IGNPAR | IXOFF;
+	/* do NOT translate CR to CR-NL (0x0A -> 0x0A 0x0D) */
+	tty->termios.c_oflag &= ~ONLCR;
+}
+
+static int kobil_open(struct tty_struct *tty, struct usb_serial_port *port)
+{
+	struct device *dev = &port->dev;
+	int result = 0;
+	struct kobil_private *priv;
+	unsigned char *transfer_buffer;
+	int transfer_buffer_length = 8;
+
+	priv = usb_get_serial_port_data(port);
+
+	/* allocate memory for transfer buffer */
+	transfer_buffer = kzalloc(transfer_buffer_length, GFP_KERNEL);
+	if (!transfer_buffer)
+		return -ENOMEM;
+
+	/* get hardware version */
+	result = usb_control_msg(port->serial->dev,
+			  usb_rcvctrlpipe(port->serial->dev, 0),
+			  SUSBCRequest_GetMisc,
+			  USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_IN,
+			  SUSBCR_MSC_GetHWVersion,
+			  0,
+			  transfer_buffer,
+			  transfer_buffer_length,
+			  KOBIL_TIMEOUT
+	);
+	dev_dbg(dev, "%s - Send get_HW_version URB returns: %i\n", __func__, result);
+	if (result >= 3) {
+		dev_dbg(dev, "Hardware version: %i.%i.%i\n", transfer_buffer[0],
+				transfer_buffer[1], transfer_buffer[2]);
+	}
+
+	/* get firmware version */
+	result = usb_control_msg(port->serial->dev,
+			  usb_rcvctrlpipe(port->serial->dev, 0),
+			  SUSBCRequest_GetMisc,
+			  USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_IN,
+			  SUSBCR_MSC_GetFWVersion,
+			  0,
+			  transfer_buffer,
+			  transfer_buffer_length,
+			  KOBIL_TIMEOUT
+	);
+	dev_dbg(dev, "%s - Send get_FW_version URB returns: %i\n", __func__, result);
+	if (result >= 3) {
+		dev_dbg(dev, "Firmware version: %i.%i.%i\n", transfer_buffer[0],
+				transfer_buffer[1], transfer_buffer[2]);
+	}
+
+	if (priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID ||
+			priv->device_type == KOBIL_ADAPTER_K_PRODUCT_ID) {
+		/* Setting Baudrate, Parity and Stopbits */
+		result = usb_control_msg(port->serial->dev,
+			  usb_sndctrlpipe(port->serial->dev, 0),
+			  SUSBCRequest_SetBaudRateParityAndStopBits,
+			  USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
+			  SUSBCR_SBR_9600 | SUSBCR_SPASB_EvenParity |
+							SUSBCR_SPASB_1StopBit,
+			  0,
+			  NULL,
+			  0,
+			  KOBIL_TIMEOUT
+		);
+		dev_dbg(dev, "%s - Send set_baudrate URB returns: %i\n", __func__, result);
+
+		/* reset all queues */
+		result = usb_control_msg(port->serial->dev,
+			  usb_sndctrlpipe(port->serial->dev, 0),
+			  SUSBCRequest_Misc,
+			  USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
+			  SUSBCR_MSC_ResetAllQueues,
+			  0,
+			  NULL,
+			  0,
+			  KOBIL_TIMEOUT
+		);
+		dev_dbg(dev, "%s - Send reset_all_queues URB returns: %i\n", __func__, result);
+	}
+	if (priv->device_type == KOBIL_USBTWIN_PRODUCT_ID ||
+	    priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID ||
+	    priv->device_type == KOBIL_KAAN_SIM_PRODUCT_ID) {
+		/* start reading (Adapter B 'cause PNP string) */
+		result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
+		dev_dbg(dev, "%s - Send read URB returns: %i\n", __func__, result);
+	}
+
+	kfree(transfer_buffer);
+	return 0;
+}
+
+
+static void kobil_close(struct usb_serial_port *port)
+{
+	/* FIXME: Add rts/dtr methods */
+	usb_kill_urb(port->interrupt_out_urb);
+	usb_kill_urb(port->interrupt_in_urb);
+}
+
+
+static void kobil_read_int_callback(struct urb *urb)
+{
+	int result;
+	struct usb_serial_port *port = urb->context;
+	unsigned char *data = urb->transfer_buffer;
+	int status = urb->status;
+
+	if (status) {
+		dev_dbg(&port->dev, "%s - Read int status not zero: %d\n", __func__, status);
+		return;
+	}
+
+	if (urb->actual_length) {
+		usb_serial_debug_data(&port->dev, __func__, urb->actual_length,
+									data);
+		tty_insert_flip_string(&port->port, data, urb->actual_length);
+		tty_flip_buffer_push(&port->port);
+	}
+
+	result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
+	dev_dbg(&port->dev, "%s - Send read URB returns: %i\n", __func__, result);
+}
+
+
+static void kobil_write_int_callback(struct urb *urb)
+{
+}
+
+
+static int kobil_write(struct tty_struct *tty, struct usb_serial_port *port,
+			const unsigned char *buf, int count)
+{
+	int length = 0;
+	int result = 0;
+	int todo = 0;
+	struct kobil_private *priv;
+
+	if (count == 0) {
+		dev_dbg(&port->dev, "%s - write request of 0 bytes\n", __func__);
+		return 0;
+	}
+
+	priv = usb_get_serial_port_data(port);
+
+	if (count > (KOBIL_BUF_LENGTH - priv->filled)) {
+		dev_dbg(&port->dev, "%s - Error: write request bigger than buffer size\n", __func__);
+		return -ENOMEM;
+	}
+
+	/* Copy data to buffer */
+	memcpy(priv->buf + priv->filled, buf, count);
+	usb_serial_debug_data(&port->dev, __func__, count, priv->buf + priv->filled);
+	priv->filled = priv->filled + count;
+
+	/* only send complete block. TWIN, KAAN SIM and adapter K
+	   use the same protocol. */
+	if (((priv->device_type != KOBIL_ADAPTER_B_PRODUCT_ID) && (priv->filled > 2) && (priv->filled >= (priv->buf[1] + 3))) ||
+	     ((priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID) && (priv->filled > 3) && (priv->filled >= (priv->buf[2] + 4)))) {
+		/* stop reading (except TWIN and KAAN SIM) */
+		if ((priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID)
+			|| (priv->device_type == KOBIL_ADAPTER_K_PRODUCT_ID))
+			usb_kill_urb(port->interrupt_in_urb);
+
+		todo = priv->filled - priv->cur_pos;
+
+		while (todo > 0) {
+			/* max 8 byte in one urb (endpoint size) */
+			length = min(todo, port->interrupt_out_size);
+			/* copy data to transfer buffer */
+			memcpy(port->interrupt_out_buffer,
+					priv->buf + priv->cur_pos, length);
+			port->interrupt_out_urb->transfer_buffer_length = length;
+
+			priv->cur_pos = priv->cur_pos + length;
+			result = usb_submit_urb(port->interrupt_out_urb,
+					GFP_ATOMIC);
+			dev_dbg(&port->dev, "%s - Send write URB returns: %i\n", __func__, result);
+			todo = priv->filled - priv->cur_pos;
+
+			if (todo > 0)
+				msleep(24);
+		}
+
+		priv->filled = 0;
+		priv->cur_pos = 0;
+
+		/* start reading (except TWIN and KAAN SIM) */
+		if (priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID ||
+			priv->device_type == KOBIL_ADAPTER_K_PRODUCT_ID) {
+			result = usb_submit_urb(port->interrupt_in_urb,
+					GFP_ATOMIC);
+			dev_dbg(&port->dev, "%s - Send read URB returns: %i\n", __func__, result);
+		}
+	}
+	return count;
+}
+
+
+static unsigned int kobil_write_room(struct tty_struct *tty)
+{
+	/* FIXME */
+	return 8;
+}
+
+
+static int kobil_tiocmget(struct tty_struct *tty)
+{
+	struct usb_serial_port *port = tty->driver_data;
+	struct kobil_private *priv;
+	int result;
+	unsigned char *transfer_buffer;
+	int transfer_buffer_length = 8;
+
+	priv = usb_get_serial_port_data(port);
+	if (priv->device_type == KOBIL_USBTWIN_PRODUCT_ID
+			|| priv->device_type == KOBIL_KAAN_SIM_PRODUCT_ID) {
+		/* This device doesn't support ioctl calls */
+		return -EINVAL;
+	}
+
+	/* allocate memory for transfer buffer */
+	transfer_buffer = kzalloc(transfer_buffer_length, GFP_KERNEL);
+	if (!transfer_buffer)
+		return -ENOMEM;
+
+	result = usb_control_msg(port->serial->dev,
+			  usb_rcvctrlpipe(port->serial->dev, 0),
+			  SUSBCRequest_GetStatusLineState,
+			  USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_IN,
+			  0,
+			  0,
+			  transfer_buffer,
+			  transfer_buffer_length,
+			  KOBIL_TIMEOUT);
+
+	dev_dbg(&port->dev, "Send get_status_line_state URB returns: %i\n",
+			result);
+	if (result < 1) {
+		if (result >= 0)
+			result = -EIO;
+		goto out_free;
+	}
+
+	dev_dbg(&port->dev, "Statusline: %02x\n", transfer_buffer[0]);
+
+	result = 0;
+	if ((transfer_buffer[0] & SUSBCR_GSL_DSR) != 0)
+		result = TIOCM_DSR;
+out_free:
+	kfree(transfer_buffer);
+	return result;
+}
+
+static int kobil_tiocmset(struct tty_struct *tty,
+			   unsigned int set, unsigned int clear)
+{
+	struct usb_serial_port *port = tty->driver_data;
+	struct device *dev = &port->dev;
+	struct kobil_private *priv;
+	int result;
+	int dtr = 0;
+	int rts = 0;
+
+	/* FIXME: locking ? */
+	priv = usb_get_serial_port_data(port);
+	if (priv->device_type == KOBIL_USBTWIN_PRODUCT_ID
+		|| priv->device_type == KOBIL_KAAN_SIM_PRODUCT_ID) {
+		/* This device doesn't support ioctl calls */
+		return -EINVAL;
+	}
+
+	if (set & TIOCM_RTS)
+		rts = 1;
+	if (set & TIOCM_DTR)
+		dtr = 1;
+	if (clear & TIOCM_RTS)
+		rts = 0;
+	if (clear & TIOCM_DTR)
+		dtr = 0;
+
+	if (priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID) {
+		if (dtr != 0)
+			dev_dbg(dev, "%s - Setting DTR\n", __func__);
+		else
+			dev_dbg(dev, "%s - Clearing DTR\n", __func__);
+		result = usb_control_msg(port->serial->dev,
+			  usb_sndctrlpipe(port->serial->dev, 0),
+			  SUSBCRequest_SetStatusLinesOrQueues,
+			  USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
+			  ((dtr != 0) ? SUSBCR_SSL_SETDTR : SUSBCR_SSL_CLRDTR),
+			  0,
+			  NULL,
+			  0,
+			  KOBIL_TIMEOUT);
+	} else {
+		if (rts != 0)
+			dev_dbg(dev, "%s - Setting RTS\n", __func__);
+		else
+			dev_dbg(dev, "%s - Clearing RTS\n", __func__);
+		result = usb_control_msg(port->serial->dev,
+			usb_sndctrlpipe(port->serial->dev, 0),
+			SUSBCRequest_SetStatusLinesOrQueues,
+			USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
+			((rts != 0) ? SUSBCR_SSL_SETRTS : SUSBCR_SSL_CLRRTS),
+			0,
+			NULL,
+			0,
+			KOBIL_TIMEOUT);
+	}
+	dev_dbg(dev, "%s - Send set_status_line URB returns: %i\n", __func__, result);
+	return (result < 0) ? result : 0;
+}
+
+static void kobil_set_termios(struct tty_struct *tty,
+			      struct usb_serial_port *port,
+			      const struct ktermios *old)
+{
+	struct kobil_private *priv;
+	int result;
+	unsigned short urb_val = 0;
+	int c_cflag = tty->termios.c_cflag;
+	speed_t speed;
+
+	priv = usb_get_serial_port_data(port);
+	if (priv->device_type == KOBIL_USBTWIN_PRODUCT_ID ||
+			priv->device_type == KOBIL_KAAN_SIM_PRODUCT_ID) {
+		/* This device doesn't support ioctl calls */
+		tty_termios_copy_hw(&tty->termios, old);
+		return;
+	}
+
+	speed = tty_get_baud_rate(tty);
+	switch (speed) {
+	case 1200:
+		urb_val = SUSBCR_SBR_1200;
+		break;
+	default:
+		speed = 9600;
+		fallthrough;
+	case 9600:
+		urb_val = SUSBCR_SBR_9600;
+		break;
+	}
+	urb_val |= (c_cflag & CSTOPB) ? SUSBCR_SPASB_2StopBits :
+							SUSBCR_SPASB_1StopBit;
+	if (c_cflag & PARENB) {
+		if  (c_cflag & PARODD)
+			urb_val |= SUSBCR_SPASB_OddParity;
+		else
+			urb_val |= SUSBCR_SPASB_EvenParity;
+	} else
+		urb_val |= SUSBCR_SPASB_NoParity;
+	tty->termios.c_cflag &= ~CMSPAR;
+	tty_encode_baud_rate(tty, speed, speed);
+
+	result = usb_control_msg(port->serial->dev,
+		  usb_sndctrlpipe(port->serial->dev, 0),
+		  SUSBCRequest_SetBaudRateParityAndStopBits,
+		  USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
+		  urb_val,
+		  0,
+		  NULL,
+		  0,
+		  KOBIL_TIMEOUT
+		);
+	if (result) {
+		dev_err(&port->dev, "failed to update line settings: %d\n",
+				result);
+	}
+}
+
+static int kobil_ioctl(struct tty_struct *tty,
+					unsigned int cmd, unsigned long arg)
+{
+	struct usb_serial_port *port = tty->driver_data;
+	struct kobil_private *priv = usb_get_serial_port_data(port);
+	int result;
+
+	if (priv->device_type == KOBIL_USBTWIN_PRODUCT_ID ||
+			priv->device_type == KOBIL_KAAN_SIM_PRODUCT_ID)
+		/* This device doesn't support ioctl calls */
+		return -ENOIOCTLCMD;
+
+	switch (cmd) {
+	case TCFLSH:
+		result = usb_control_msg(port->serial->dev,
+			  usb_sndctrlpipe(port->serial->dev, 0),
+			  SUSBCRequest_Misc,
+			  USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
+			  SUSBCR_MSC_ResetAllQueues,
+			  0,
+			  NULL,
+			  0,
+			  KOBIL_TIMEOUT
+			);
+
+		dev_dbg(&port->dev,
+			"%s - Send reset_all_queues (FLUSH) URB returns: %i\n",
+			__func__, result);
+		return (result < 0) ? -EIO: 0;
+	default:
+		return -ENOIOCTLCMD;
+	}
+}
+
+module_usb_serial_driver(serial_drivers, id_table);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");