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, 579 insertions, 0 deletions

diff --git a/drivers/usb/serial/ftdi_sio.h b/drivers/usb/serial/ftdi_sio.h
new file mode 100644
index 000000000..55ea61264
--- /dev/null
+++ b/drivers/usb/serial/ftdi_sio.h
@@ -0,0 +1,579 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Driver definitions for the FTDI USB Single Port Serial Converter -
+ * known as FTDI_SIO (Serial Input/Output application of the chipset)
+ *
+ * For USB vendor/product IDs (VID/PID), please see ftdi_sio_ids.h
+ *
+ *
+ * The example I have is known as the USC-1000 which is available from
+ * http://www.dse.co.nz - cat no XH4214 It looks similar to this:
+ * http://www.dansdata.com/usbser.htm but I can't be sure There are other
+ * USC-1000s which don't look like my device though so beware!
+ *
+ * The device is based on the FTDI FT8U100AX chip. It has a DB25 on one side,
+ * USB on the other.
+ *
+ * Thanx to FTDI (http://www.ftdichip.com) for so kindly providing details
+ * of the protocol required to talk to the device and ongoing assistence
+ * during development.
+ *
+ * Bill Ryder - bryder@sgi.com formerly of Silicon Graphics, Inc.- wrote the
+ * FTDI_SIO implementation.
+ *
+ */
+
+/* Commands */
+#define FTDI_SIO_RESET			0 /* Reset the port */
+#define FTDI_SIO_MODEM_CTRL		1 /* Set the modem control register */
+#define FTDI_SIO_SET_FLOW_CTRL		2 /* Set flow control register */
+#define FTDI_SIO_SET_BAUD_RATE		3 /* Set baud rate */
+#define FTDI_SIO_SET_DATA		4 /* Set the data characteristics of
+					     the port */
+#define FTDI_SIO_GET_MODEM_STATUS	5 /* Retrieve current value of modem
+					     status register */
+#define FTDI_SIO_SET_EVENT_CHAR		6 /* Set the event character */
+#define FTDI_SIO_SET_ERROR_CHAR		7 /* Set the error character */
+#define FTDI_SIO_SET_LATENCY_TIMER	9 /* Set the latency timer */
+#define FTDI_SIO_GET_LATENCY_TIMER	0x0a /* Get the latency timer */
+#define FTDI_SIO_SET_BITMODE		0x0b /* Set bitbang mode */
+#define FTDI_SIO_READ_PINS		0x0c /* Read immediate value of pins */
+#define FTDI_SIO_READ_EEPROM		0x90 /* Read EEPROM */
+
+/* Channel indices for FT2232, FT2232H and FT4232H devices */
+#define CHANNEL_A		1
+#define CHANNEL_B		2
+#define CHANNEL_C		3
+#define CHANNEL_D		4
+
+
+/*
+ *   BmRequestType:  1100 0000b
+ *   bRequest:       FTDI_E2_READ
+ *   wValue:         0
+ *   wIndex:         Address of word to read
+ *   wLength:        2
+ *   Data:           Will return a word of data from E2Address
+ *
+ */
+
+/* Port Identifier Table */
+#define PIT_DEFAULT		0 /* SIOA */
+#define PIT_SIOA		1 /* SIOA */
+/* The device this driver is tested with one has only one port */
+#define PIT_SIOB		2 /* SIOB */
+#define PIT_PARALLEL		3 /* Parallel */
+
+/* FTDI_SIO_RESET */
+#define FTDI_SIO_RESET_REQUEST FTDI_SIO_RESET
+#define FTDI_SIO_RESET_REQUEST_TYPE 0x40
+#define FTDI_SIO_RESET_SIO 0
+#define FTDI_SIO_RESET_PURGE_RX 1
+#define FTDI_SIO_RESET_PURGE_TX 2
+
+/*
+ * BmRequestType:  0100 0000B
+ * bRequest:       FTDI_SIO_RESET
+ * wValue:         Control Value
+ *                   0 = Reset SIO
+ *                   1 = Purge RX buffer
+ *                   2 = Purge TX buffer
+ * wIndex:         Port
+ * wLength:        0
+ * Data:           None
+ *
+ * The Reset SIO command has this effect:
+ *
+ *    Sets flow control set to 'none'
+ *    Event char = $0D
+ *    Event trigger = disabled
+ *    Purge RX buffer
+ *    Purge TX buffer
+ *    Clear DTR
+ *    Clear RTS
+ *    baud and data format not reset
+ *
+ * The Purge RX and TX buffer commands affect nothing except the buffers
+ *
+   */
+
+/* FTDI_SIO_SET_BAUDRATE */
+#define FTDI_SIO_SET_BAUDRATE_REQUEST_TYPE 0x40
+#define FTDI_SIO_SET_BAUDRATE_REQUEST 3
+
+/*
+ * BmRequestType:  0100 0000B
+ * bRequest:       FTDI_SIO_SET_BAUDRATE
+ * wValue:         BaudDivisor value - see below
+ * wIndex:         Port
+ * wLength:        0
+ * Data:           None
+ * The BaudDivisor values are calculated as follows:
+ * - BaseClock is either 12000000 or 48000000 depending on the device.
+ *   FIXME: I wish I knew how to detect old chips to select proper base clock!
+ * - BaudDivisor is a fixed point number encoded in a funny way.
+ *   (--WRONG WAY OF THINKING--)
+ *   BaudDivisor is a fixed point number encoded with following bit weighs:
+ *   (-2)(-1)(13..0). It is a radical with a denominator of 4, so values
+ *   end with 0.0 (00...), 0.25 (10...), 0.5 (01...), and 0.75 (11...).
+ *   (--THE REALITY--)
+ *   The both-bits-set has quite different meaning from 0.75 - the chip
+ *   designers have decided it to mean 0.125 instead of 0.75.
+ *   This info looked up in FTDI application note "FT8U232 DEVICES \ Data Rates
+ *   and Flow Control Consideration for USB to RS232".
+ * - BaudDivisor = (BaseClock / 16) / BaudRate, where the (=) operation should
+ *   automagically re-encode the resulting value to take fractions into
+ *   consideration.
+ * As all values are integers, some bit twiddling is in order:
+ *   BaudDivisor = (BaseClock / 16 / BaudRate) |
+ *   (((BaseClock / 2 / BaudRate) & 4) ? 0x4000    // 0.5
+ *    : ((BaseClock / 2 / BaudRate) & 2) ? 0x8000  // 0.25
+ *    : ((BaseClock / 2 / BaudRate) & 1) ? 0xc000  // 0.125
+ *    : 0)
+ *
+ * For the FT232BM, a 17th divisor bit was introduced to encode the multiples
+ * of 0.125 missing from the FT8U232AM.  Bits 16 to 14 are coded as follows
+ * (the first four codes are the same as for the FT8U232AM, where bit 16 is
+ * always 0):
+ *   000 - add .000 to divisor
+ *   001 - add .500 to divisor
+ *   010 - add .250 to divisor
+ *   011 - add .125 to divisor
+ *   100 - add .375 to divisor
+ *   101 - add .625 to divisor
+ *   110 - add .750 to divisor
+ *   111 - add .875 to divisor
+ * Bits 15 to 0 of the 17-bit divisor are placed in the urb value.  Bit 16 is
+ * placed in bit 0 of the urb index.
+ *
+ * Note that there are a couple of special cases to support the highest baud
+ * rates.  If the calculated divisor value is 1, this needs to be replaced with
+ * 0.  Additionally for the FT232BM, if the calculated divisor value is 0x4001
+ * (1.5), this needs to be replaced with 0x0001 (1) (but this divisor value is
+ * not supported by the FT8U232AM).
+ */
+
+enum ftdi_sio_baudrate {
+	ftdi_sio_b300 = 0,
+	ftdi_sio_b600 = 1,
+	ftdi_sio_b1200 = 2,
+	ftdi_sio_b2400 = 3,
+	ftdi_sio_b4800 = 4,
+	ftdi_sio_b9600 = 5,
+	ftdi_sio_b19200 = 6,
+	ftdi_sio_b38400 = 7,
+	ftdi_sio_b57600 = 8,
+	ftdi_sio_b115200 = 9
+};
+
+/*
+ * The ftdi_8U232AM_xxMHz_byyy constants have been removed. The encoded divisor
+ * values are calculated internally.
+ */
+#define FTDI_SIO_SET_DATA_REQUEST	FTDI_SIO_SET_DATA
+#define FTDI_SIO_SET_DATA_REQUEST_TYPE	0x40
+#define FTDI_SIO_SET_DATA_PARITY_NONE	(0x0 << 8)
+#define FTDI_SIO_SET_DATA_PARITY_ODD	(0x1 << 8)
+#define FTDI_SIO_SET_DATA_PARITY_EVEN	(0x2 << 8)
+#define FTDI_SIO_SET_DATA_PARITY_MARK	(0x3 << 8)
+#define FTDI_SIO_SET_DATA_PARITY_SPACE	(0x4 << 8)
+#define FTDI_SIO_SET_DATA_STOP_BITS_1	(0x0 << 11)
+#define FTDI_SIO_SET_DATA_STOP_BITS_15	(0x1 << 11)
+#define FTDI_SIO_SET_DATA_STOP_BITS_2	(0x2 << 11)
+#define FTDI_SIO_SET_BREAK		(0x1 << 14)
+/* FTDI_SIO_SET_DATA */
+
+/*
+ * BmRequestType:  0100 0000B
+ * bRequest:       FTDI_SIO_SET_DATA
+ * wValue:         Data characteristics (see below)
+ * wIndex:         Port
+ * wLength:        0
+ * Data:           No
+ *
+ * Data characteristics
+ *
+ *   B0..7   Number of data bits
+ *   B8..10  Parity
+ *           0 = None
+ *           1 = Odd
+ *           2 = Even
+ *           3 = Mark
+ *           4 = Space
+ *   B11..13 Stop Bits
+ *           0 = 1
+ *           1 = 1.5
+ *           2 = 2
+ *   B14
+ *           1 = TX ON (break)
+ *           0 = TX OFF (normal state)
+ *   B15 Reserved
+ *
+ */
+
+
+
+/* FTDI_SIO_MODEM_CTRL */
+#define FTDI_SIO_SET_MODEM_CTRL_REQUEST_TYPE 0x40
+#define FTDI_SIO_SET_MODEM_CTRL_REQUEST FTDI_SIO_MODEM_CTRL
+
+/*
+ * BmRequestType:   0100 0000B
+ * bRequest:        FTDI_SIO_MODEM_CTRL
+ * wValue:          ControlValue (see below)
+ * wIndex:          Port
+ * wLength:         0
+ * Data:            None
+ *
+ * NOTE: If the device is in RTS/CTS flow control, the RTS set by this
+ * command will be IGNORED without an error being returned
+ * Also - you can not set DTR and RTS with one control message
+ */
+
+#define FTDI_SIO_SET_DTR_MASK 0x1
+#define FTDI_SIO_SET_DTR_HIGH ((FTDI_SIO_SET_DTR_MASK  << 8) | 1)
+#define FTDI_SIO_SET_DTR_LOW  ((FTDI_SIO_SET_DTR_MASK  << 8) | 0)
+#define FTDI_SIO_SET_RTS_MASK 0x2
+#define FTDI_SIO_SET_RTS_HIGH ((FTDI_SIO_SET_RTS_MASK << 8) | 2)
+#define FTDI_SIO_SET_RTS_LOW  ((FTDI_SIO_SET_RTS_MASK << 8) | 0)
+
+/*
+ * ControlValue
+ * B0    DTR state
+ *          0 = reset
+ *          1 = set
+ * B1    RTS state
+ *          0 = reset
+ *          1 = set
+ * B2..7 Reserved
+ * B8    DTR state enable
+ *          0 = ignore
+ *          1 = use DTR state
+ * B9    RTS state enable
+ *          0 = ignore
+ *          1 = use RTS state
+ * B10..15 Reserved
+ */
+
+/* FTDI_SIO_SET_FLOW_CTRL */
+#define FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE 0x40
+#define FTDI_SIO_SET_FLOW_CTRL_REQUEST FTDI_SIO_SET_FLOW_CTRL
+#define FTDI_SIO_DISABLE_FLOW_CTRL 0x0
+#define FTDI_SIO_RTS_CTS_HS (0x1 << 8)
+#define FTDI_SIO_DTR_DSR_HS (0x2 << 8)
+#define FTDI_SIO_XON_XOFF_HS (0x4 << 8)
+/*
+ *   BmRequestType:  0100 0000b
+ *   bRequest:       FTDI_SIO_SET_FLOW_CTRL
+ *   wValue:         Xoff/Xon
+ *   wIndex:         Protocol/Port - hIndex is protocol / lIndex is port
+ *   wLength:        0
+ *   Data:           None
+ *
+ * hIndex protocol is:
+ *   B0 Output handshaking using RTS/CTS
+ *       0 = disabled
+ *       1 = enabled
+ *   B1 Output handshaking using DTR/DSR
+ *       0 = disabled
+ *       1 = enabled
+ *   B2 Xon/Xoff handshaking
+ *       0 = disabled
+ *       1 = enabled
+ *
+ * A value of zero in the hIndex field disables handshaking
+ *
+ * If Xon/Xoff handshaking is specified, the hValue field should contain the
+ * XOFF character and the lValue field contains the XON character.
+ */
+
+/*
+ * FTDI_SIO_GET_LATENCY_TIMER
+ *
+ * Set the timeout interval. The FTDI collects data from the
+ * device, transmitting it to the host when either A) 62 bytes are
+ * received, or B) the timeout interval has elapsed and the buffer
+ * contains at least 1 byte.  Setting this value to a small number
+ * can dramatically improve performance for applications which send
+ * small packets, since the default value is 16ms.
+ */
+#define  FTDI_SIO_GET_LATENCY_TIMER_REQUEST FTDI_SIO_GET_LATENCY_TIMER
+#define  FTDI_SIO_GET_LATENCY_TIMER_REQUEST_TYPE 0xC0
+
+/*
+ *  BmRequestType:   1100 0000b
+ *  bRequest:        FTDI_SIO_GET_LATENCY_TIMER
+ *  wValue:          0
+ *  wIndex:          Port
+ *  wLength:         0
+ *  Data:            latency (on return)
+ */
+
+/*
+ * FTDI_SIO_SET_LATENCY_TIMER
+ *
+ * Set the timeout interval. The FTDI collects data from the
+ * device, transmitting it to the host when either A) 62 bytes are
+ * received, or B) the timeout interval has elapsed and the buffer
+ * contains at least 1 byte.  Setting this value to a small number
+ * can dramatically improve performance for applications which send
+ * small packets, since the default value is 16ms.
+ */
+#define  FTDI_SIO_SET_LATENCY_TIMER_REQUEST FTDI_SIO_SET_LATENCY_TIMER
+#define  FTDI_SIO_SET_LATENCY_TIMER_REQUEST_TYPE 0x40
+
+/*
+ *  BmRequestType:   0100 0000b
+ *  bRequest:        FTDI_SIO_SET_LATENCY_TIMER
+ *  wValue:          Latency (milliseconds)
+ *  wIndex:          Port
+ *  wLength:         0
+ *  Data:            None
+ *
+ * wValue:
+ *   B0..7   Latency timer
+ *   B8..15  0
+ *
+ */
+
+/*
+ * FTDI_SIO_SET_EVENT_CHAR
+ *
+ * Set the special event character for the specified communications port.
+ * If the device sees this character it will immediately return the
+ * data read so far - rather than wait 40ms or until 62 bytes are read
+ * which is what normally happens.
+ */
+
+
+#define  FTDI_SIO_SET_EVENT_CHAR_REQUEST FTDI_SIO_SET_EVENT_CHAR
+#define  FTDI_SIO_SET_EVENT_CHAR_REQUEST_TYPE 0x40
+
+
+/*
+ *  BmRequestType:   0100 0000b
+ *  bRequest:        FTDI_SIO_SET_EVENT_CHAR
+ *  wValue:          EventChar
+ *  wIndex:          Port
+ *  wLength:         0
+ *  Data:            None
+ *
+ * wValue:
+ *   B0..7   Event Character
+ *   B8      Event Character Processing
+ *             0 = disabled
+ *             1 = enabled
+ *   B9..15  Reserved
+ *
+ */
+
+/* FTDI_SIO_SET_ERROR_CHAR */
+
+/*
+ * Set the parity error replacement character for the specified communications
+ * port
+ */
+
+/*
+ *  BmRequestType:  0100 0000b
+ *  bRequest:       FTDI_SIO_SET_EVENT_CHAR
+ *  wValue:         Error Char
+ *  wIndex:         Port
+ *  wLength:        0
+ *  Data:           None
+ *
+ *Error Char
+ *  B0..7  Error Character
+ *  B8     Error Character Processing
+ *           0 = disabled
+ *           1 = enabled
+ *  B9..15 Reserved
+ *
+ */
+
+/* FTDI_SIO_GET_MODEM_STATUS */
+/* Retrieve the current value of the modem status register */
+
+#define FTDI_SIO_GET_MODEM_STATUS_REQUEST_TYPE 0xc0
+#define FTDI_SIO_GET_MODEM_STATUS_REQUEST FTDI_SIO_GET_MODEM_STATUS
+#define FTDI_SIO_CTS_MASK 0x10
+#define FTDI_SIO_DSR_MASK 0x20
+#define FTDI_SIO_RI_MASK  0x40
+#define FTDI_SIO_RLSD_MASK 0x80
+/*
+ *   BmRequestType:   1100 0000b
+ *   bRequest:        FTDI_SIO_GET_MODEM_STATUS
+ *   wValue:          zero
+ *   wIndex:          Port
+ *   wLength:         1
+ *   Data:            Status
+ *
+ * One byte of data is returned
+ * B0..3 0
+ * B4    CTS
+ *         0 = inactive
+ *         1 = active
+ * B5    DSR
+ *         0 = inactive
+ *         1 = active
+ * B6    Ring Indicator (RI)
+ *         0 = inactive
+ *         1 = active
+ * B7    Receive Line Signal Detect (RLSD)
+ *         0 = inactive
+ *         1 = active
+ */
+
+/* FTDI_SIO_SET_BITMODE */
+#define FTDI_SIO_SET_BITMODE_REQUEST_TYPE 0x40
+#define FTDI_SIO_SET_BITMODE_REQUEST FTDI_SIO_SET_BITMODE
+
+/* Possible bitmodes for FTDI_SIO_SET_BITMODE_REQUEST */
+#define FTDI_SIO_BITMODE_RESET		0x00
+#define FTDI_SIO_BITMODE_CBUS		0x20
+
+/* FTDI_SIO_READ_PINS */
+#define FTDI_SIO_READ_PINS_REQUEST_TYPE 0xc0
+#define FTDI_SIO_READ_PINS_REQUEST FTDI_SIO_READ_PINS
+
+/*
+ * FTDI_SIO_READ_EEPROM
+ *
+ * EEPROM format found in FTDI AN_201, "FT-X MTP memory Configuration",
+ * http://www.ftdichip.com/Support/Documents/AppNotes/AN_201_FT-X%20MTP%20Memory%20Configuration.pdf
+ */
+#define FTDI_SIO_READ_EEPROM_REQUEST_TYPE 0xc0
+#define FTDI_SIO_READ_EEPROM_REQUEST FTDI_SIO_READ_EEPROM
+
+#define FTDI_FTX_CBUS_MUX_GPIO		0x8
+#define FTDI_FT232R_CBUS_MUX_GPIO	0xa
+
+
+/* Descriptors returned by the device
+ *
+ *  Device Descriptor
+ *
+ * Offset	Field		Size	Value	Description
+ * 0	bLength		1	0x12	Size of descriptor in bytes
+ * 1	bDescriptorType	1	0x01	DEVICE Descriptor Type
+ * 2	bcdUSB		2	0x0110	USB Spec Release Number
+ * 4	bDeviceClass	1	0x00	Class Code
+ * 5	bDeviceSubClass	1	0x00	SubClass Code
+ * 6	bDeviceProtocol	1	0x00	Protocol Code
+ * 7	bMaxPacketSize0 1	0x08	Maximum packet size for endpoint 0
+ * 8	idVendor	2	0x0403	Vendor ID
+ * 10	idProduct	2	0x8372	Product ID (FTDI_SIO_PID)
+ * 12	bcdDevice	2	0x0001	Device release number
+ * 14	iManufacturer	1	0x01	Index of man. string desc
+ * 15	iProduct	1	0x02	Index of prod string desc
+ * 16	iSerialNumber	1	0x02	Index of serial nmr string desc
+ * 17	bNumConfigurations 1    0x01	Number of possible configurations
+ *
+ * Configuration Descriptor
+ *
+ * Offset	Field			Size	Value
+ * 0	bLength			1	0x09	Size of descriptor in bytes
+ * 1	bDescriptorType		1	0x02	CONFIGURATION Descriptor Type
+ * 2	wTotalLength		2	0x0020	Total length of data
+ * 4	bNumInterfaces		1	0x01	Number of interfaces supported
+ * 5	bConfigurationValue	1	0x01	Argument for SetCOnfiguration() req
+ * 6	iConfiguration		1	0x02	Index of config string descriptor
+ * 7	bmAttributes		1	0x20	Config characteristics Remote Wakeup
+ * 8	MaxPower		1	0x1E	Max power consumption
+ *
+ * Interface Descriptor
+ *
+ * Offset	Field			Size	Value
+ * 0	bLength			1	0x09	Size of descriptor in bytes
+ * 1	bDescriptorType		1	0x04	INTERFACE Descriptor Type
+ * 2	bInterfaceNumber	1	0x00	Number of interface
+ * 3	bAlternateSetting	1	0x00	Value used to select alternate
+ * 4	bNumEndpoints		1	0x02	Number of endpoints
+ * 5	bInterfaceClass		1	0xFF	Class Code
+ * 6	bInterfaceSubClass	1	0xFF	Subclass Code
+ * 7	bInterfaceProtocol	1	0xFF	Protocol Code
+ * 8	iInterface		1	0x02	Index of interface string description
+ *
+ * IN Endpoint Descriptor
+ *
+ * Offset	Field			Size	Value
+ * 0	bLength			1	0x07	Size of descriptor in bytes
+ * 1	bDescriptorType		1	0x05	ENDPOINT descriptor type
+ * 2	bEndpointAddress	1	0x82	Address of endpoint
+ * 3	bmAttributes		1	0x02	Endpoint attributes - Bulk
+ * 4	bNumEndpoints		2	0x0040	maximum packet size
+ * 5	bInterval		1	0x00	Interval for polling endpoint
+ *
+ * OUT Endpoint Descriptor
+ *
+ * Offset	Field			Size	Value
+ * 0	bLength			1	0x07	Size of descriptor in bytes
+ * 1	bDescriptorType		1	0x05	ENDPOINT descriptor type
+ * 2	bEndpointAddress	1	0x02	Address of endpoint
+ * 3	bmAttributes		1	0x02	Endpoint attributes - Bulk
+ * 4	bNumEndpoints		2	0x0040	maximum packet size
+ * 5	bInterval		1	0x00	Interval for polling endpoint
+ *
+ * DATA FORMAT
+ *
+ * IN Endpoint
+ *
+ * The device reserves the first two bytes of data on this endpoint to contain
+ * the current values of the modem and line status registers. In the absence of
+ * data, the device generates a message consisting of these two status bytes
+ * every 40 ms
+ *
+ * Byte 0: Modem Status
+ *
+ * Offset	Description
+ * B0	Reserved - must be 1
+ * B1	Reserved - must be 0
+ * B2	Reserved - must be 0
+ * B3	Reserved - must be 0
+ * B4	Clear to Send (CTS)
+ * B5	Data Set Ready (DSR)
+ * B6	Ring Indicator (RI)
+ * B7	Receive Line Signal Detect (RLSD)
+ *
+ * Byte 1: Line Status
+ *
+ * Offset	Description
+ * B0	Data Ready (DR)
+ * B1	Overrun Error (OE)
+ * B2	Parity Error (PE)
+ * B3	Framing Error (FE)
+ * B4	Break Interrupt (BI)
+ * B5	Transmitter Holding Register (THRE)
+ * B6	Transmitter Empty (TEMT)
+ * B7	Error in RCVR FIFO
+ *
+ */
+#define FTDI_RS0_CTS	(1 << 4)
+#define FTDI_RS0_DSR	(1 << 5)
+#define FTDI_RS0_RI	(1 << 6)
+#define FTDI_RS0_RLSD	(1 << 7)
+
+#define FTDI_RS_DR	1
+#define FTDI_RS_OE	(1<<1)
+#define FTDI_RS_PE	(1<<2)
+#define FTDI_RS_FE	(1<<3)
+#define FTDI_RS_BI	(1<<4)
+#define FTDI_RS_THRE	(1<<5)
+#define FTDI_RS_TEMT	(1<<6)
+#define FTDI_RS_FIFO	(1<<7)
+
+/*
+ * OUT Endpoint
+ *
+ * This device reserves the first bytes of data on this endpoint contain the
+ * length and port identifier of the message. For the FTDI USB Serial converter
+ * the port identifier is always 1.
+ *
+ * Byte 0: Line Status
+ *
+ * Offset	Description
+ * B0	Reserved - must be 1
+ * B1	Reserved - must be 0
+ * B2..7	Length of message - (not including Byte 0)
+ *
+ */