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, 1832 insertions, 0 deletions

diff --git a/Documentation/driver-api/parport-lowlevel.rst b/Documentation/driver-api/parport-lowlevel.rst
new file mode 100644
index 000000000..0633d70ff
--- /dev/null
+++ b/Documentation/driver-api/parport-lowlevel.rst
@@ -0,0 +1,1832 @@
+===============================
+PARPORT interface documentation
+===============================
+
+:Time-stamp: <2000-02-24 13:30:20 twaugh>
+
+Described here are the following functions:
+
+Global functions::
+  parport_register_driver
+  parport_unregister_driver
+  parport_enumerate
+  parport_register_device
+  parport_unregister_device
+  parport_claim
+  parport_claim_or_block
+  parport_release
+  parport_yield
+  parport_yield_blocking
+  parport_wait_peripheral
+  parport_poll_peripheral
+  parport_wait_event
+  parport_negotiate
+  parport_read
+  parport_write
+  parport_open
+  parport_close
+  parport_device_id
+  parport_device_coords
+  parport_find_class
+  parport_find_device
+  parport_set_timeout
+
+Port functions (can be overridden by low-level drivers):
+
+  SPP::
+    port->ops->read_data
+    port->ops->write_data
+    port->ops->read_status
+    port->ops->read_control
+    port->ops->write_control
+    port->ops->frob_control
+    port->ops->enable_irq
+    port->ops->disable_irq
+    port->ops->data_forward
+    port->ops->data_reverse
+
+  EPP::
+    port->ops->epp_write_data
+    port->ops->epp_read_data
+    port->ops->epp_write_addr
+    port->ops->epp_read_addr
+
+  ECP::
+    port->ops->ecp_write_data
+    port->ops->ecp_read_data
+    port->ops->ecp_write_addr
+
+  Other::
+    port->ops->nibble_read_data
+    port->ops->byte_read_data
+    port->ops->compat_write_data
+
+The parport subsystem comprises ``parport`` (the core port-sharing
+code), and a variety of low-level drivers that actually do the port
+accesses.  Each low-level driver handles a particular style of port
+(PC, Amiga, and so on).
+
+The parport interface to the device driver author can be broken down
+into global functions and port functions.
+
+The global functions are mostly for communicating between the device
+driver and the parport subsystem: acquiring a list of available ports,
+claiming a port for exclusive use, and so on.  They also include
+``generic`` functions for doing standard things that will work on any
+IEEE 1284-capable architecture.
+
+The port functions are provided by the low-level drivers, although the
+core parport module provides generic ``defaults`` for some routines.
+The port functions can be split into three groups: SPP, EPP, and ECP.
+
+SPP (Standard Parallel Port) functions modify so-called ``SPP``
+registers: data, status, and control.  The hardware may not actually
+have registers exactly like that, but the PC does and this interface is
+modelled after common PC implementations.  Other low-level drivers may
+be able to emulate most of the functionality.
+
+EPP (Enhanced Parallel Port) functions are provided for reading and
+writing in IEEE 1284 EPP mode, and ECP (Extended Capabilities Port)
+functions are used for IEEE 1284 ECP mode. (What about BECP? Does
+anyone care?)
+
+Hardware assistance for EPP and/or ECP transfers may or may not be
+available, and if it is available it may or may not be used.  If
+hardware is not used, the transfer will be software-driven.  In order
+to cope with peripherals that only tenuously support IEEE 1284, a
+low-level driver specific function is provided, for altering 'fudge
+factors'.
+
+Global functions
+================
+
+parport_register_driver - register a device driver with parport
+---------------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	struct parport_driver {
+		const char *name;
+		void (*attach) (struct parport *);
+		void (*detach) (struct parport *);
+		struct parport_driver *next;
+	};
+	int parport_register_driver (struct parport_driver *driver);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+In order to be notified about parallel ports when they are detected,
+parport_register_driver should be called.  Your driver will
+immediately be notified of all ports that have already been detected,
+and of each new port as low-level drivers are loaded.
+
+A ``struct parport_driver`` contains the textual name of your driver,
+a pointer to a function to handle new ports, and a pointer to a
+function to handle ports going away due to a low-level driver
+unloading.  Ports will only be detached if they are not being used
+(i.e. there are no devices registered on them).
+
+The visible parts of the ``struct parport *`` argument given to
+attach/detach are::
+
+	struct parport
+	{
+		struct parport *next; /* next parport in list */
+		const char *name;     /* port's name */
+		unsigned int modes;   /* bitfield of hardware modes */
+		struct parport_device_info probe_info;
+				/* IEEE1284 info */
+		int number;           /* parport index */
+		struct parport_operations *ops;
+		...
+	};
+
+There are other members of the structure, but they should not be
+touched.
+
+The ``modes`` member summarises the capabilities of the underlying
+hardware.  It consists of flags which may be bitwise-ored together:
+
+  ============================= ===============================================
+  PARPORT_MODE_PCSPP		IBM PC registers are available,
+				i.e. functions that act on data,
+				control and status registers are
+				probably writing directly to the
+				hardware.
+  PARPORT_MODE_TRISTATE		The data drivers may be turned off.
+				This allows the data lines to be used
+				for reverse (peripheral to host)
+				transfers.
+  PARPORT_MODE_COMPAT		The hardware can assist with
+				compatibility-mode (printer)
+				transfers, i.e. compat_write_block.
+  PARPORT_MODE_EPP		The hardware can assist with EPP
+				transfers.
+  PARPORT_MODE_ECP		The hardware can assist with ECP
+				transfers.
+  PARPORT_MODE_DMA		The hardware can use DMA, so you might
+				want to pass ISA DMA-able memory
+				(i.e. memory allocated using the
+				GFP_DMA flag with kmalloc) to the
+				low-level driver in order to take
+				advantage of it.
+  ============================= ===============================================
+
+There may be other flags in ``modes`` as well.
+
+The contents of ``modes`` is advisory only.  For example, if the
+hardware is capable of DMA, and PARPORT_MODE_DMA is in ``modes``, it
+doesn't necessarily mean that DMA will always be used when possible.
+Similarly, hardware that is capable of assisting ECP transfers won't
+necessarily be used.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+Zero on success, otherwise an error code.
+
+ERRORS
+^^^^^^
+
+None. (Can it fail? Why return int?)
+
+EXAMPLE
+^^^^^^^
+
+::
+
+	static void lp_attach (struct parport *port)
+	{
+		...
+		private = kmalloc (...);
+		dev[count++] = parport_register_device (...);
+		...
+	}
+
+	static void lp_detach (struct parport *port)
+	{
+		...
+	}
+
+	static struct parport_driver lp_driver = {
+		"lp",
+		lp_attach,
+		lp_detach,
+		NULL /* always put NULL here */
+	};
+
+	int lp_init (void)
+	{
+		...
+		if (parport_register_driver (&lp_driver)) {
+			/* Failed; nothing we can do. */
+			return -EIO;
+		}
+		...
+	}
+
+
+SEE ALSO
+^^^^^^^^
+
+parport_unregister_driver, parport_register_device, parport_enumerate
+
+
+
+parport_unregister_driver - tell parport to forget about this driver
+--------------------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	struct parport_driver {
+		const char *name;
+		void (*attach) (struct parport *);
+		void (*detach) (struct parport *);
+		struct parport_driver *next;
+	};
+	void parport_unregister_driver (struct parport_driver *driver);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+This tells parport not to notify the device driver of new ports or of
+ports going away.  Registered devices belonging to that driver are NOT
+unregistered: parport_unregister_device must be used for each one.
+
+EXAMPLE
+^^^^^^^
+
+::
+
+	void cleanup_module (void)
+	{
+		...
+		/* Stop notifications. */
+		parport_unregister_driver (&lp_driver);
+
+		/* Unregister devices. */
+		for (i = 0; i < NUM_DEVS; i++)
+			parport_unregister_device (dev[i]);
+		...
+	}
+
+SEE ALSO
+^^^^^^^^
+
+parport_register_driver, parport_enumerate
+
+
+
+parport_enumerate - retrieve a list of parallel ports (DEPRECATED)
+------------------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	struct parport *parport_enumerate (void);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Retrieve the first of a list of valid parallel ports for this machine.
+Successive parallel ports can be found using the ``struct parport
+*next`` element of the ``struct parport *`` that is returned.  If ``next``
+is NULL, there are no more parallel ports in the list.  The number of
+ports in the list will not exceed PARPORT_MAX.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+A ``struct parport *`` describing a valid parallel port for the machine,
+or NULL if there are none.
+
+ERRORS
+^^^^^^
+
+This function can return NULL to indicate that there are no parallel
+ports to use.
+
+EXAMPLE
+^^^^^^^
+
+::
+
+	int detect_device (void)
+	{
+		struct parport *port;
+
+		for (port = parport_enumerate ();
+		port != NULL;
+		port = port->next) {
+			/* Try to detect a device on the port... */
+			...
+		}
+		}
+
+		...
+	}
+
+NOTES
+^^^^^
+
+parport_enumerate is deprecated; parport_register_driver should be
+used instead.
+
+SEE ALSO
+^^^^^^^^
+
+parport_register_driver, parport_unregister_driver
+
+
+
+parport_register_device - register to use a port
+------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	typedef int (*preempt_func) (void *handle);
+	typedef void (*wakeup_func) (void *handle);
+	typedef int (*irq_func) (int irq, void *handle, struct pt_regs *);
+
+	struct pardevice *parport_register_device(struct parport *port,
+						  const char *name,
+						  preempt_func preempt,
+						  wakeup_func wakeup,
+						  irq_func irq,
+						  int flags,
+						  void *handle);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Use this function to register your device driver on a parallel port
+(``port``).  Once you have done that, you will be able to use
+parport_claim and parport_release in order to use the port.
+
+The (``name``) argument is the name of the device that appears in /proc
+filesystem. The string must be valid for the whole lifetime of the
+device (until parport_unregister_device is called).
+
+This function will register three callbacks into your driver:
+``preempt``, ``wakeup`` and ``irq``.  Each of these may be NULL in order to
+indicate that you do not want a callback.
+
+When the ``preempt`` function is called, it is because another driver
+wishes to use the parallel port.  The ``preempt`` function should return
+non-zero if the parallel port cannot be released yet -- if zero is
+returned, the port is lost to another driver and the port must be
+re-claimed before use.
+
+The ``wakeup`` function is called once another driver has released the
+port and no other driver has yet claimed it.  You can claim the
+parallel port from within the ``wakeup`` function (in which case the
+claim is guaranteed to succeed), or choose not to if you don't need it
+now.
+
+If an interrupt occurs on the parallel port your driver has claimed,
+the ``irq`` function will be called. (Write something about shared
+interrupts here.)
+
+The ``handle`` is a pointer to driver-specific data, and is passed to
+the callback functions.
+
+``flags`` may be a bitwise combination of the following flags:
+
+  ===================== =================================================
+        Flag            Meaning
+  ===================== =================================================
+  PARPORT_DEV_EXCL	The device cannot share the parallel port at all.
+			Use this only when absolutely necessary.
+  ===================== =================================================
+
+The typedefs are not actually defined -- they are only shown in order
+to make the function prototype more readable.
+
+The visible parts of the returned ``struct pardevice`` are::
+
+	struct pardevice {
+		struct parport *port;	/* Associated port */
+		void *private;		/* Device driver's 'handle' */
+		...
+	};
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+A ``struct pardevice *``: a handle to the registered parallel port
+device that can be used for parport_claim, parport_release, etc.
+
+ERRORS
+^^^^^^
+
+A return value of NULL indicates that there was a problem registering
+a device on that port.
+
+EXAMPLE
+^^^^^^^
+
+::
+
+	static int preempt (void *handle)
+	{
+		if (busy_right_now)
+			return 1;
+
+		must_reclaim_port = 1;
+		return 0;
+	}
+
+	static void wakeup (void *handle)
+	{
+		struct toaster *private = handle;
+		struct pardevice *dev = private->dev;
+		if (!dev) return; /* avoid races */
+
+		if (want_port)
+			parport_claim (dev);
+	}
+
+	static int toaster_detect (struct toaster *private, struct parport *port)
+	{
+		private->dev = parport_register_device (port, "toaster", preempt,
+							wakeup, NULL, 0,
+							private);
+		if (!private->dev)
+			/* Couldn't register with parport. */
+			return -EIO;
+
+		must_reclaim_port = 0;
+		busy_right_now = 1;
+		parport_claim_or_block (private->dev);
+		...
+		/* Don't need the port while the toaster warms up. */
+		busy_right_now = 0;
+		...
+		busy_right_now = 1;
+		if (must_reclaim_port) {
+			parport_claim_or_block (private->dev);
+			must_reclaim_port = 0;
+		}
+		...
+	}
+
+SEE ALSO
+^^^^^^^^
+
+parport_unregister_device, parport_claim
+
+
+
+parport_unregister_device - finish using a port
+-----------------------------------------------
+
+SYNPOPSIS
+
+::
+
+	#include <linux/parport.h>
+
+	void parport_unregister_device (struct pardevice *dev);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+This function is the opposite of parport_register_device.  After using
+parport_unregister_device, ``dev`` is no longer a valid device handle.
+
+You should not unregister a device that is currently claimed, although
+if you do it will be released automatically.
+
+EXAMPLE
+^^^^^^^
+
+::
+
+	...
+	kfree (dev->private); /* before we lose the pointer */
+	parport_unregister_device (dev);
+	...
+
+SEE ALSO
+^^^^^^^^
+
+
+parport_unregister_driver
+
+parport_claim, parport_claim_or_block - claim the parallel port for a device
+----------------------------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	int parport_claim (struct pardevice *dev);
+	int parport_claim_or_block (struct pardevice *dev);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+These functions attempt to gain control of the parallel port on which
+``dev`` is registered.  ``parport_claim`` does not block, but
+``parport_claim_or_block`` may do. (Put something here about blocking
+interruptibly or non-interruptibly.)
+
+You should not try to claim a port that you have already claimed.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+A return value of zero indicates that the port was successfully
+claimed, and the caller now has possession of the parallel port.
+
+If ``parport_claim_or_block`` blocks before returning successfully, the
+return value is positive.
+
+ERRORS
+^^^^^^
+
+========== ==========================================================
+  -EAGAIN  The port is unavailable at the moment, but another attempt
+           to claim it may succeed.
+========== ==========================================================
+
+SEE ALSO
+^^^^^^^^
+
+
+parport_release
+
+parport_release - release the parallel port
+-------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	void parport_release (struct pardevice *dev);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Once a parallel port device has been claimed, it can be released using
+``parport_release``.  It cannot fail, but you should not release a
+device that you do not have possession of.
+
+EXAMPLE
+^^^^^^^
+
+::
+
+	static size_t write (struct pardevice *dev, const void *buf,
+			size_t len)
+	{
+		...
+		written = dev->port->ops->write_ecp_data (dev->port, buf,
+							len);
+		parport_release (dev);
+		...
+	}
+
+
+SEE ALSO
+^^^^^^^^
+
+change_mode, parport_claim, parport_claim_or_block, parport_yield
+
+
+
+parport_yield, parport_yield_blocking - temporarily release a parallel port
+---------------------------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	int parport_yield (struct pardevice *dev)
+	int parport_yield_blocking (struct pardevice *dev);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+When a driver has control of a parallel port, it may allow another
+driver to temporarily ``borrow`` it.  ``parport_yield`` does not block;
+``parport_yield_blocking`` may do.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+A return value of zero indicates that the caller still owns the port
+and the call did not block.
+
+A positive return value from ``parport_yield_blocking`` indicates that
+the caller still owns the port and the call blocked.
+
+A return value of -EAGAIN indicates that the caller no longer owns the
+port, and it must be re-claimed before use.
+
+ERRORS
+^^^^^^
+
+========= ==========================================================
+  -EAGAIN  Ownership of the parallel port was given away.
+========= ==========================================================
+
+SEE ALSO
+^^^^^^^^
+
+parport_release
+
+
+
+parport_wait_peripheral - wait for status lines, up to 35ms
+-----------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	int parport_wait_peripheral (struct parport *port,
+				     unsigned char mask,
+				     unsigned char val);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Wait for the status lines in mask to match the values in val.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+======== ==========================================================
+ -EINTR  a signal is pending
+      0  the status lines in mask have values in val
+      1  timed out while waiting (35ms elapsed)
+======== ==========================================================
+
+SEE ALSO
+^^^^^^^^
+
+parport_poll_peripheral
+
+
+
+parport_poll_peripheral - wait for status lines, in usec
+--------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	int parport_poll_peripheral (struct parport *port,
+				     unsigned char mask,
+				     unsigned char val,
+				     int usec);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Wait for the status lines in mask to match the values in val.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+======== ==========================================================
+ -EINTR  a signal is pending
+      0  the status lines in mask have values in val
+      1  timed out while waiting (usec microseconds have elapsed)
+======== ==========================================================
+
+SEE ALSO
+^^^^^^^^
+
+parport_wait_peripheral
+
+
+
+parport_wait_event - wait for an event on a port
+------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	int parport_wait_event (struct parport *port, signed long timeout)
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Wait for an event (e.g. interrupt) on a port.  The timeout is in
+jiffies.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+======= ==========================================================
+      0  success
+     <0  error (exit as soon as possible)
+     >0  timed out
+======= ==========================================================
+
+parport_negotiate - perform IEEE 1284 negotiation
+-------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	int parport_negotiate (struct parport *, int mode);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Perform IEEE 1284 negotiation.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+======= ==========================================================
+     0  handshake OK; IEEE 1284 peripheral and mode available
+    -1  handshake failed; peripheral not compliant (or none present)
+     1  handshake OK; IEEE 1284 peripheral present but mode not
+        available
+======= ==========================================================
+
+SEE ALSO
+^^^^^^^^
+
+parport_read, parport_write
+
+
+
+parport_read - read data from device
+------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	ssize_t parport_read (struct parport *, void *buf, size_t len);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Read data from device in current IEEE 1284 transfer mode.  This only
+works for modes that support reverse data transfer.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+If negative, an error code; otherwise the number of bytes transferred.
+
+SEE ALSO
+^^^^^^^^
+
+parport_write, parport_negotiate
+
+
+
+parport_write - write data to device
+------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	ssize_t parport_write (struct parport *, const void *buf, size_t len);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Write data to device in current IEEE 1284 transfer mode.  This only
+works for modes that support forward data transfer.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+If negative, an error code; otherwise the number of bytes transferred.
+
+SEE ALSO
+^^^^^^^^
+
+parport_read, parport_negotiate
+
+
+
+parport_open - register device for particular device number
+-----------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	struct pardevice *parport_open (int devnum, const char *name,
+				        int (*pf) (void *),
+					void (*kf) (void *),
+					void (*irqf) (int, void *,
+						      struct pt_regs *),
+					int flags, void *handle);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+This is like parport_register_device but takes a device number instead
+of a pointer to a struct parport.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+See parport_register_device.  If no device is associated with devnum,
+NULL is returned.
+
+SEE ALSO
+^^^^^^^^
+
+parport_register_device
+
+
+
+parport_close - unregister device for particular device number
+--------------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	void parport_close (struct pardevice *dev);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+This is the equivalent of parport_unregister_device for parport_open.
+
+SEE ALSO
+^^^^^^^^
+
+parport_unregister_device, parport_open
+
+
+
+parport_device_id - obtain IEEE 1284 Device ID
+----------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	ssize_t parport_device_id (int devnum, char *buffer, size_t len);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Obtains the IEEE 1284 Device ID associated with a given device.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+If negative, an error code; otherwise, the number of bytes of buffer
+that contain the device ID.  The format of the device ID is as
+follows::
+
+	[length][ID]
+
+The first two bytes indicate the inclusive length of the entire Device
+ID, and are in big-endian order.  The ID is a sequence of pairs of the
+form::
+
+	key:value;
+
+NOTES
+^^^^^
+
+Many devices have ill-formed IEEE 1284 Device IDs.
+
+SEE ALSO
+^^^^^^^^
+
+parport_find_class, parport_find_device
+
+
+
+parport_device_coords - convert device number to device coordinates
+-------------------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	int parport_device_coords (int devnum, int *parport, int *mux,
+				   int *daisy);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Convert between device number (zero-based) and device coordinates
+(port, multiplexor, daisy chain address).
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+Zero on success, in which case the coordinates are (``*parport``, ``*mux``,
+``*daisy``).
+
+SEE ALSO
+^^^^^^^^
+
+parport_open, parport_device_id
+
+
+
+parport_find_class - find a device by its class
+-----------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	typedef enum {
+		PARPORT_CLASS_LEGACY = 0,       /* Non-IEEE1284 device */
+		PARPORT_CLASS_PRINTER,
+		PARPORT_CLASS_MODEM,
+		PARPORT_CLASS_NET,
+		PARPORT_CLASS_HDC,              /* Hard disk controller */
+		PARPORT_CLASS_PCMCIA,
+		PARPORT_CLASS_MEDIA,            /* Multimedia device */
+		PARPORT_CLASS_FDC,              /* Floppy disk controller */
+		PARPORT_CLASS_PORTS,
+		PARPORT_CLASS_SCANNER,
+		PARPORT_CLASS_DIGCAM,
+		PARPORT_CLASS_OTHER,            /* Anything else */
+		PARPORT_CLASS_UNSPEC,           /* No CLS field in ID */
+		PARPORT_CLASS_SCSIADAPTER
+	} parport_device_class;
+
+	int parport_find_class (parport_device_class cls, int from);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Find a device by class.  The search starts from device number from+1.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+The device number of the next device in that class, or -1 if no such
+device exists.
+
+NOTES
+^^^^^
+
+Example usage::
+
+	int devnum = -1;
+	while ((devnum = parport_find_class (PARPORT_CLASS_DIGCAM, devnum)) != -1) {
+		struct pardevice *dev = parport_open (devnum, ...);
+		...
+	}
+
+SEE ALSO
+^^^^^^^^
+
+parport_find_device, parport_open, parport_device_id
+
+
+
+parport_find_device - find a device by its class
+------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	int parport_find_device (const char *mfg, const char *mdl, int from);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Find a device by vendor and model.  The search starts from device
+number from+1.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+The device number of the next device matching the specifications, or
+-1 if no such device exists.
+
+NOTES
+^^^^^
+
+Example usage::
+
+	int devnum = -1;
+	while ((devnum = parport_find_device ("IOMEGA", "ZIP+", devnum)) != -1) {
+		struct pardevice *dev = parport_open (devnum, ...);
+		...
+	}
+
+SEE ALSO
+^^^^^^^^
+
+parport_find_class, parport_open, parport_device_id
+
+
+
+parport_set_timeout - set the inactivity timeout
+------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	long parport_set_timeout (struct pardevice *dev, long inactivity);
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Set the inactivity timeout, in jiffies, for a registered device.  The
+previous timeout is returned.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+The previous timeout, in jiffies.
+
+NOTES
+^^^^^
+
+Some of the port->ops functions for a parport may take time, owing to
+delays at the peripheral.  After the peripheral has not responded for
+``inactivity`` jiffies, a timeout will occur and the blocking function
+will return.
+
+A timeout of 0 jiffies is a special case: the function must do as much
+as it can without blocking or leaving the hardware in an unknown
+state.  If port operations are performed from within an interrupt
+handler, for instance, a timeout of 0 jiffies should be used.
+
+Once set for a registered device, the timeout will remain at the set
+value until set again.
+
+SEE ALSO
+^^^^^^^^
+
+port->ops->xxx_read/write_yyy
+
+
+
+
+PORT FUNCTIONS
+==============
+
+The functions in the port->ops structure (struct parport_operations)
+are provided by the low-level driver responsible for that port.
+
+port->ops->read_data - read the data register
+---------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	struct parport_operations {
+		...
+		unsigned char (*read_data) (struct parport *port);
+		...
+	};
+
+DESCRIPTION
+^^^^^^^^^^^
+
+If port->modes contains the PARPORT_MODE_TRISTATE flag and the
+PARPORT_CONTROL_DIRECTION bit in the control register is set, this
+returns the value on the data pins.  If port->modes contains the
+PARPORT_MODE_TRISTATE flag and the PARPORT_CONTROL_DIRECTION bit is
+not set, the return value _may_ be the last value written to the data
+register.  Otherwise the return value is undefined.
+
+SEE ALSO
+^^^^^^^^
+
+write_data, read_status, write_control
+
+
+
+port->ops->write_data - write the data register
+-----------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	struct parport_operations {
+		...
+		void (*write_data) (struct parport *port, unsigned char d);
+		...
+	};
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Writes to the data register.  May have side-effects (a STROBE pulse,
+for instance).
+
+SEE ALSO
+^^^^^^^^
+
+read_data, read_status, write_control
+
+
+
+port->ops->read_status - read the status register
+-------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	struct parport_operations {
+		...
+		unsigned char (*read_status) (struct parport *port);
+		...
+	};
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Reads from the status register.  This is a bitmask:
+
+- PARPORT_STATUS_ERROR (printer fault, "nFault")
+- PARPORT_STATUS_SELECT (on-line, "Select")
+- PARPORT_STATUS_PAPEROUT (no paper, "PError")
+- PARPORT_STATUS_ACK (handshake, "nAck")
+- PARPORT_STATUS_BUSY (busy, "Busy")
+
+There may be other bits set.
+
+SEE ALSO
+^^^^^^^^
+
+read_data, write_data, write_control
+
+
+
+port->ops->read_control - read the control register
+---------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	struct parport_operations {
+		...
+		unsigned char (*read_control) (struct parport *port);
+		...
+	};
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Returns the last value written to the control register (either from
+write_control or frob_control).  No port access is performed.
+
+SEE ALSO
+^^^^^^^^
+
+read_data, write_data, read_status, write_control
+
+
+
+port->ops->write_control - write the control register
+-----------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	struct parport_operations {
+		...
+		void (*write_control) (struct parport *port, unsigned char s);
+		...
+	};
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Writes to the control register. This is a bitmask::
+
+				  _______
+	- PARPORT_CONTROL_STROBE (nStrobe)
+				  _______
+	- PARPORT_CONTROL_AUTOFD (nAutoFd)
+				_____
+	- PARPORT_CONTROL_INIT (nInit)
+				  _________
+	- PARPORT_CONTROL_SELECT (nSelectIn)
+
+SEE ALSO
+^^^^^^^^
+
+read_data, write_data, read_status, frob_control
+
+
+
+port->ops->frob_control - write control register bits
+-----------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	struct parport_operations {
+		...
+		unsigned char (*frob_control) (struct parport *port,
+					unsigned char mask,
+					unsigned char val);
+		...
+	};
+
+DESCRIPTION
+^^^^^^^^^^^
+
+This is equivalent to reading from the control register, masking out
+the bits in mask, exclusive-or'ing with the bits in val, and writing
+the result to the control register.
+
+As some ports don't allow reads from the control port, a software copy
+of its contents is maintained, so frob_control is in fact only one
+port access.
+
+SEE ALSO
+^^^^^^^^
+
+read_data, write_data, read_status, write_control
+
+
+
+port->ops->enable_irq - enable interrupt generation
+---------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	struct parport_operations {
+		...
+		void (*enable_irq) (struct parport *port);
+		...
+	};
+
+DESCRIPTION
+^^^^^^^^^^^
+
+The parallel port hardware is instructed to generate interrupts at
+appropriate moments, although those moments are
+architecture-specific.  For the PC architecture, interrupts are
+commonly generated on the rising edge of nAck.
+
+SEE ALSO
+^^^^^^^^
+
+disable_irq
+
+
+
+port->ops->disable_irq - disable interrupt generation
+-----------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	struct parport_operations {
+		...
+		void (*disable_irq) (struct parport *port);
+		...
+	};
+
+DESCRIPTION
+^^^^^^^^^^^
+
+The parallel port hardware is instructed not to generate interrupts.
+The interrupt itself is not masked.
+
+SEE ALSO
+^^^^^^^^
+
+enable_irq
+
+
+
+port->ops->data_forward - enable data drivers
+---------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	struct parport_operations {
+		...
+		void (*data_forward) (struct parport *port);
+		...
+	};
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Enables the data line drivers, for 8-bit host-to-peripheral
+communications.
+
+SEE ALSO
+^^^^^^^^
+
+data_reverse
+
+
+
+port->ops->data_reverse - tristate the buffer
+---------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	struct parport_operations {
+		...
+		void (*data_reverse) (struct parport *port);
+		...
+	};
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Places the data bus in a high impedance state, if port->modes has the
+PARPORT_MODE_TRISTATE bit set.
+
+SEE ALSO
+^^^^^^^^
+
+data_forward
+
+
+
+port->ops->epp_write_data - write EPP data
+------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	struct parport_operations {
+		...
+		size_t (*epp_write_data) (struct parport *port, const void *buf,
+					size_t len, int flags);
+		...
+	};
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Writes data in EPP mode, and returns the number of bytes written.
+
+The ``flags`` parameter may be one or more of the following,
+bitwise-or'ed together:
+
+======================= =================================================
+PARPORT_EPP_FAST	Use fast transfers. Some chips provide 16-bit and
+			32-bit registers.  However, if a transfer
+			times out, the return value may be unreliable.
+======================= =================================================
+
+SEE ALSO
+^^^^^^^^
+
+epp_read_data, epp_write_addr, epp_read_addr
+
+
+
+port->ops->epp_read_data - read EPP data
+----------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	struct parport_operations {
+		...
+		size_t (*epp_read_data) (struct parport *port, void *buf,
+					size_t len, int flags);
+		...
+	};
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Reads data in EPP mode, and returns the number of bytes read.
+
+The ``flags`` parameter may be one or more of the following,
+bitwise-or'ed together:
+
+======================= =================================================
+PARPORT_EPP_FAST	Use fast transfers. Some chips provide 16-bit and
+			32-bit registers.  However, if a transfer
+			times out, the return value may be unreliable.
+======================= =================================================
+
+SEE ALSO
+^^^^^^^^
+
+epp_write_data, epp_write_addr, epp_read_addr
+
+
+
+port->ops->epp_write_addr - write EPP address
+---------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	struct parport_operations {
+		...
+		size_t (*epp_write_addr) (struct parport *port,
+					const void *buf, size_t len, int flags);
+		...
+	};
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Writes EPP addresses (8 bits each), and returns the number written.
+
+The ``flags`` parameter may be one or more of the following,
+bitwise-or'ed together:
+
+======================= =================================================
+PARPORT_EPP_FAST	Use fast transfers. Some chips provide 16-bit and
+			32-bit registers.  However, if a transfer
+			times out, the return value may be unreliable.
+======================= =================================================
+
+(Does PARPORT_EPP_FAST make sense for this function?)
+
+SEE ALSO
+^^^^^^^^
+
+epp_write_data, epp_read_data, epp_read_addr
+
+
+
+port->ops->epp_read_addr - read EPP address
+-------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	struct parport_operations {
+		...
+		size_t (*epp_read_addr) (struct parport *port, void *buf,
+					size_t len, int flags);
+		...
+	};
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Reads EPP addresses (8 bits each), and returns the number read.
+
+The ``flags`` parameter may be one or more of the following,
+bitwise-or'ed together:
+
+======================= =================================================
+PARPORT_EPP_FAST	Use fast transfers. Some chips provide 16-bit and
+			32-bit registers.  However, if a transfer
+			times out, the return value may be unreliable.
+======================= =================================================
+
+(Does PARPORT_EPP_FAST make sense for this function?)
+
+SEE ALSO
+^^^^^^^^
+
+epp_write_data, epp_read_data, epp_write_addr
+
+
+
+port->ops->ecp_write_data - write a block of ECP data
+-----------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	struct parport_operations {
+		...
+		size_t (*ecp_write_data) (struct parport *port,
+					const void *buf, size_t len, int flags);
+		...
+	};
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Writes a block of ECP data.  The ``flags`` parameter is ignored.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+The number of bytes written.
+
+SEE ALSO
+^^^^^^^^
+
+ecp_read_data, ecp_write_addr
+
+
+
+port->ops->ecp_read_data - read a block of ECP data
+---------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	struct parport_operations {
+		...
+		size_t (*ecp_read_data) (struct parport *port,
+					void *buf, size_t len, int flags);
+		...
+	};
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Reads a block of ECP data.  The ``flags`` parameter is ignored.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+The number of bytes read.  NB. There may be more unread data in a
+FIFO.  Is there a way of stunning the FIFO to prevent this?
+
+SEE ALSO
+^^^^^^^^
+
+ecp_write_block, ecp_write_addr
+
+
+
+port->ops->ecp_write_addr - write a block of ECP addresses
+----------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	struct parport_operations {
+		...
+		size_t (*ecp_write_addr) (struct parport *port,
+					const void *buf, size_t len, int flags);
+		...
+	};
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Writes a block of ECP addresses.  The ``flags`` parameter is ignored.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+The number of bytes written.
+
+NOTES
+^^^^^
+
+This may use a FIFO, and if so shall not return until the FIFO is empty.
+
+SEE ALSO
+^^^^^^^^
+
+ecp_read_data, ecp_write_data
+
+
+
+port->ops->nibble_read_data - read a block of data in nibble mode
+-----------------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	struct parport_operations {
+		...
+		size_t (*nibble_read_data) (struct parport *port,
+					void *buf, size_t len, int flags);
+		...
+	};
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Reads a block of data in nibble mode.  The ``flags`` parameter is ignored.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+The number of whole bytes read.
+
+SEE ALSO
+^^^^^^^^
+
+byte_read_data, compat_write_data
+
+
+
+port->ops->byte_read_data - read a block of data in byte mode
+-------------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	struct parport_operations {
+		...
+		size_t (*byte_read_data) (struct parport *port,
+					void *buf, size_t len, int flags);
+		...
+	};
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Reads a block of data in byte mode.  The ``flags`` parameter is ignored.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+The number of bytes read.
+
+SEE ALSO
+^^^^^^^^
+
+nibble_read_data, compat_write_data
+
+
+
+port->ops->compat_write_data - write a block of data in compatibility mode
+--------------------------------------------------------------------------
+
+SYNOPSIS
+^^^^^^^^
+
+::
+
+	#include <linux/parport.h>
+
+	struct parport_operations {
+		...
+		size_t (*compat_write_data) (struct parport *port,
+					const void *buf, size_t len, int flags);
+		...
+	};
+
+DESCRIPTION
+^^^^^^^^^^^
+
+Writes a block of data in compatibility mode.  The ``flags`` parameter
+is ignored.
+
+RETURN VALUE
+^^^^^^^^^^^^
+
+The number of bytes written.
+
+SEE ALSO
+^^^^^^^^
+
+nibble_read_data, byte_read_data