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authorLibravatar Linus Torvalds <torvalds@linux-foundation.org>2023-02-21 18:24:12 -0800
committerLibravatar Linus Torvalds <torvalds@linux-foundation.org>2023-02-21 18:24:12 -0800
commit5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 (patch)
treecc5c2d0a898769fd59549594fedb3ee6f84e59a0 /drivers/parport/parport_gsc.c
downloadlinux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.tar.gz
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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(). ...
Diffstat (limited to 'drivers/parport/parport_gsc.c')
-rw-r--r--drivers/parport/parport_gsc.c426
1 files changed, 426 insertions, 0 deletions
diff --git a/drivers/parport/parport_gsc.c b/drivers/parport/parport_gsc.c
new file mode 100644
index 000000000..0dcc497b0
--- /dev/null
+++ b/drivers/parport/parport_gsc.c
@@ -0,0 +1,426 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Low-level parallel-support for PC-style hardware integrated in the
+ * LASI-Controller (on GSC-Bus) for HP-PARISC Workstations
+ *
+ * (C) 1999-2001 by Helge Deller <deller@gmx.de>
+ *
+ * based on parport_pc.c by
+ * Grant Guenther <grant@torque.net>
+ * Phil Blundell <philb@gnu.org>
+ * Tim Waugh <tim@cyberelk.demon.co.uk>
+ * Jose Renau <renau@acm.org>
+ * David Campbell
+ * Andrea Arcangeli
+ */
+
+#undef DEBUG /* undef for production */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/sysctl.h>
+
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <linux/uaccess.h>
+#include <asm/superio.h>
+
+#include <linux/parport.h>
+#include <asm/pdc.h>
+#include <asm/parisc-device.h>
+#include <asm/hardware.h>
+#include "parport_gsc.h"
+
+
+MODULE_AUTHOR("Helge Deller <deller@gmx.de>");
+MODULE_DESCRIPTION("HP-PARISC PC-style parallel port driver");
+MODULE_LICENSE("GPL");
+
+
+/*
+ * Clear TIMEOUT BIT in EPP MODE
+ *
+ * This is also used in SPP detection.
+ */
+static int clear_epp_timeout(struct parport *pb)
+{
+ unsigned char r;
+
+ if (!(parport_gsc_read_status(pb) & 0x01))
+ return 1;
+
+ /* To clear timeout some chips require double read */
+ parport_gsc_read_status(pb);
+ r = parport_gsc_read_status(pb);
+ parport_writeb (r | 0x01, STATUS (pb)); /* Some reset by writing 1 */
+ parport_writeb (r & 0xfe, STATUS (pb)); /* Others by writing 0 */
+ r = parport_gsc_read_status(pb);
+
+ return !(r & 0x01);
+}
+
+/*
+ * Access functions.
+ *
+ * Most of these aren't static because they may be used by the
+ * parport_xxx_yyy macros. extern __inline__ versions of several
+ * of these are in parport_gsc.h.
+ */
+
+void parport_gsc_init_state(struct pardevice *dev, struct parport_state *s)
+{
+ s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0);
+}
+
+void parport_gsc_save_state(struct parport *p, struct parport_state *s)
+{
+ s->u.pc.ctr = parport_readb (CONTROL (p));
+}
+
+void parport_gsc_restore_state(struct parport *p, struct parport_state *s)
+{
+ parport_writeb (s->u.pc.ctr, CONTROL (p));
+}
+
+struct parport_operations parport_gsc_ops =
+{
+ .write_data = parport_gsc_write_data,
+ .read_data = parport_gsc_read_data,
+
+ .write_control = parport_gsc_write_control,
+ .read_control = parport_gsc_read_control,
+ .frob_control = parport_gsc_frob_control,
+
+ .read_status = parport_gsc_read_status,
+
+ .enable_irq = parport_gsc_enable_irq,
+ .disable_irq = parport_gsc_disable_irq,
+
+ .data_forward = parport_gsc_data_forward,
+ .data_reverse = parport_gsc_data_reverse,
+
+ .init_state = parport_gsc_init_state,
+ .save_state = parport_gsc_save_state,
+ .restore_state = parport_gsc_restore_state,
+
+ .epp_write_data = parport_ieee1284_epp_write_data,
+ .epp_read_data = parport_ieee1284_epp_read_data,
+ .epp_write_addr = parport_ieee1284_epp_write_addr,
+ .epp_read_addr = parport_ieee1284_epp_read_addr,
+
+ .ecp_write_data = parport_ieee1284_ecp_write_data,
+ .ecp_read_data = parport_ieee1284_ecp_read_data,
+ .ecp_write_addr = parport_ieee1284_ecp_write_addr,
+
+ .compat_write_data = parport_ieee1284_write_compat,
+ .nibble_read_data = parport_ieee1284_read_nibble,
+ .byte_read_data = parport_ieee1284_read_byte,
+
+ .owner = THIS_MODULE,
+};
+
+/* --- Mode detection ------------------------------------- */
+
+/*
+ * Checks for port existence, all ports support SPP MODE
+ */
+static int parport_SPP_supported(struct parport *pb)
+{
+ unsigned char r, w;
+
+ /*
+ * first clear an eventually pending EPP timeout
+ * I (sailer@ife.ee.ethz.ch) have an SMSC chipset
+ * that does not even respond to SPP cycles if an EPP
+ * timeout is pending
+ */
+ clear_epp_timeout(pb);
+
+ /* Do a simple read-write test to make sure the port exists. */
+ w = 0xc;
+ parport_writeb (w, CONTROL (pb));
+
+ /* Is there a control register that we can read from? Some
+ * ports don't allow reads, so read_control just returns a
+ * software copy. Some ports _do_ allow reads, so bypass the
+ * software copy here. In addition, some bits aren't
+ * writable. */
+ r = parport_readb (CONTROL (pb));
+ if ((r & 0xf) == w) {
+ w = 0xe;
+ parport_writeb (w, CONTROL (pb));
+ r = parport_readb (CONTROL (pb));
+ parport_writeb (0xc, CONTROL (pb));
+ if ((r & 0xf) == w)
+ return PARPORT_MODE_PCSPP;
+ }
+
+ /* Try the data register. The data lines aren't tri-stated at
+ * this stage, so we expect back what we wrote. */
+ w = 0xaa;
+ parport_gsc_write_data (pb, w);
+ r = parport_gsc_read_data (pb);
+ if (r == w) {
+ w = 0x55;
+ parport_gsc_write_data (pb, w);
+ r = parport_gsc_read_data (pb);
+ if (r == w)
+ return PARPORT_MODE_PCSPP;
+ }
+
+ return 0;
+}
+
+/* Detect PS/2 support.
+ *
+ * Bit 5 (0x20) sets the PS/2 data direction; setting this high
+ * allows us to read data from the data lines. In theory we would get back
+ * 0xff but any peripheral attached to the port may drag some or all of the
+ * lines down to zero. So if we get back anything that isn't the contents
+ * of the data register we deem PS/2 support to be present.
+ *
+ * Some SPP ports have "half PS/2" ability - you can't turn off the line
+ * drivers, but an external peripheral with sufficiently beefy drivers of
+ * its own can overpower them and assert its own levels onto the bus, from
+ * where they can then be read back as normal. Ports with this property
+ * and the right type of device attached are likely to fail the SPP test,
+ * (as they will appear to have stuck bits) and so the fact that they might
+ * be misdetected here is rather academic.
+ */
+
+static int parport_PS2_supported(struct parport *pb)
+{
+ int ok = 0;
+
+ clear_epp_timeout(pb);
+
+ /* try to tri-state the buffer */
+ parport_gsc_data_reverse (pb);
+
+ parport_gsc_write_data(pb, 0x55);
+ if (parport_gsc_read_data(pb) != 0x55) ok++;
+
+ parport_gsc_write_data(pb, 0xaa);
+ if (parport_gsc_read_data(pb) != 0xaa) ok++;
+
+ /* cancel input mode */
+ parport_gsc_data_forward (pb);
+
+ if (ok) {
+ pb->modes |= PARPORT_MODE_TRISTATE;
+ } else {
+ struct parport_gsc_private *priv = pb->private_data;
+ priv->ctr_writable &= ~0x20;
+ }
+
+ return ok;
+}
+
+
+/* --- Initialisation code -------------------------------- */
+
+struct parport *parport_gsc_probe_port(unsigned long base,
+ unsigned long base_hi, int irq,
+ int dma, struct parisc_device *padev)
+{
+ struct parport_gsc_private *priv;
+ struct parport_operations *ops;
+ struct parport tmp;
+ struct parport *p = &tmp;
+
+ priv = kzalloc (sizeof (struct parport_gsc_private), GFP_KERNEL);
+ if (!priv) {
+ printk(KERN_DEBUG "parport (0x%lx): no memory!\n", base);
+ return NULL;
+ }
+ ops = kmemdup(&parport_gsc_ops, sizeof(struct parport_operations),
+ GFP_KERNEL);
+ if (!ops) {
+ printk(KERN_DEBUG "parport (0x%lx): no memory for ops!\n",
+ base);
+ kfree (priv);
+ return NULL;
+ }
+ priv->ctr = 0xc;
+ priv->ctr_writable = 0xff;
+ priv->dma_buf = NULL;
+ priv->dma_handle = 0;
+ p->base = base;
+ p->base_hi = base_hi;
+ p->irq = irq;
+ p->dma = dma;
+ p->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT;
+ p->ops = ops;
+ p->private_data = priv;
+ p->physport = p;
+ if (!parport_SPP_supported (p)) {
+ /* No port. */
+ kfree (priv);
+ kfree(ops);
+ return NULL;
+ }
+ parport_PS2_supported (p);
+
+ if (!(p = parport_register_port(base, PARPORT_IRQ_NONE,
+ PARPORT_DMA_NONE, ops))) {
+ kfree (priv);
+ kfree (ops);
+ return NULL;
+ }
+
+ p->dev = &padev->dev;
+ p->base_hi = base_hi;
+ p->modes = tmp.modes;
+ p->size = (p->modes & PARPORT_MODE_EPP)?8:3;
+ p->private_data = priv;
+
+ pr_info("%s: PC-style at 0x%lx", p->name, p->base);
+ p->irq = irq;
+ if (p->irq == PARPORT_IRQ_AUTO) {
+ p->irq = PARPORT_IRQ_NONE;
+ }
+ if (p->irq != PARPORT_IRQ_NONE) {
+ pr_cont(", irq %d", p->irq);
+
+ if (p->dma == PARPORT_DMA_AUTO) {
+ p->dma = PARPORT_DMA_NONE;
+ }
+ }
+ if (p->dma == PARPORT_DMA_AUTO) /* To use DMA, giving the irq
+ is mandatory (see above) */
+ p->dma = PARPORT_DMA_NONE;
+
+ pr_cont(" [");
+#define printmode(x) \
+do { \
+ if (p->modes & PARPORT_MODE_##x) \
+ pr_cont("%s%s", f++ ? "," : "", #x); \
+} while (0)
+ {
+ int f = 0;
+ printmode(PCSPP);
+ printmode(TRISTATE);
+ printmode(COMPAT);
+ printmode(EPP);
+// printmode(ECP);
+// printmode(DMA);
+ }
+#undef printmode
+ pr_cont("]\n");
+
+ if (p->irq != PARPORT_IRQ_NONE) {
+ if (request_irq (p->irq, parport_irq_handler,
+ 0, p->name, p)) {
+ pr_warn("%s: irq %d in use, resorting to polled operation\n",
+ p->name, p->irq);
+ p->irq = PARPORT_IRQ_NONE;
+ p->dma = PARPORT_DMA_NONE;
+ }
+ }
+
+ /* Done probing. Now put the port into a sensible start-up state. */
+
+ parport_gsc_write_data(p, 0);
+ parport_gsc_data_forward (p);
+
+ /* Now that we've told the sharing engine about the port, and
+ found out its characteristics, let the high-level drivers
+ know about it. */
+ parport_announce_port (p);
+
+ return p;
+}
+
+
+#define PARPORT_GSC_OFFSET 0x800
+
+static int parport_count;
+
+static int __init parport_init_chip(struct parisc_device *dev)
+{
+ struct parport *p;
+ unsigned long port;
+
+ if (!dev->irq) {
+ pr_warn("IRQ not found for parallel device at 0x%llx\n",
+ (unsigned long long)dev->hpa.start);
+ return -ENODEV;
+ }
+
+ port = dev->hpa.start + PARPORT_GSC_OFFSET;
+
+ /* some older machines with ASP-chip don't support
+ * the enhanced parport modes.
+ */
+ if (boot_cpu_data.cpu_type > pcxt && !pdc_add_valid(port+4)) {
+
+ /* Initialize bidirectional-mode (0x10) & data-tranfer-mode #1 (0x20) */
+ pr_info("%s: initialize bidirectional-mode\n", __func__);
+ parport_writeb ( (0x10 + 0x20), port + 4);
+
+ } else {
+ pr_info("%s: enhanced parport-modes not supported\n", __func__);
+ }
+
+ p = parport_gsc_probe_port(port, 0, dev->irq,
+ /* PARPORT_IRQ_NONE */ PARPORT_DMA_NONE, dev);
+ if (p)
+ parport_count++;
+ dev_set_drvdata(&dev->dev, p);
+
+ return 0;
+}
+
+static void __exit parport_remove_chip(struct parisc_device *dev)
+{
+ struct parport *p = dev_get_drvdata(&dev->dev);
+ if (p) {
+ struct parport_gsc_private *priv = p->private_data;
+ struct parport_operations *ops = p->ops;
+ parport_remove_port(p);
+ if (p->dma != PARPORT_DMA_NONE)
+ free_dma(p->dma);
+ if (p->irq != PARPORT_IRQ_NONE)
+ free_irq(p->irq, p);
+ if (priv->dma_buf)
+ dma_free_coherent(&priv->dev->dev, PAGE_SIZE,
+ priv->dma_buf, priv->dma_handle);
+ kfree (p->private_data);
+ parport_put_port(p);
+ kfree (ops); /* hope no-one cached it */
+ }
+}
+
+static const struct parisc_device_id parport_tbl[] __initconst = {
+ { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x74 },
+ { 0, }
+};
+
+MODULE_DEVICE_TABLE(parisc, parport_tbl);
+
+static struct parisc_driver parport_driver __refdata = {
+ .name = "Parallel",
+ .id_table = parport_tbl,
+ .probe = parport_init_chip,
+ .remove = __exit_p(parport_remove_chip),
+};
+
+int parport_gsc_init(void)
+{
+ return register_parisc_driver(&parport_driver);
+}
+
+static void parport_gsc_exit(void)
+{
+ unregister_parisc_driver(&parport_driver);
+}
+
+module_init(parport_gsc_init);
+module_exit(parport_gsc_exit);