drivers/input/serio/gscps2.c - kernel/msm-4.9 - Gitiles

 /*
  * drivers/input/serio/gscps2.c
  *
  * Copyright (c) 2004-2006 Helge Deller <deller@gmx.de>
  * Copyright (c) 2002 Laurent Canet <canetl@esiee.fr>
  * Copyright (c) 2002 Thibaut Varene <varenet@parisc-linux.org>
  *
  * Pieces of code based on linux-2.4's hp_mouse.c & hp_keyb.c
  *	Copyright (c) 1999 Alex deVries <alex@onefishtwo.ca>
  *	Copyright (c) 1999-2000 Philipp Rumpf <prumpf@tux.org>
  *	Copyright (c) 2000 Xavier Debacker <debackex@esiee.fr>
  *	Copyright (c) 2000-2001 Thomas Marteau <marteaut@esiee.fr>
  *
  * HP GSC PS/2 port driver, found in PA/RISC Workstations
  *
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  *
  * TODO:
  * - Dino testing (did HP ever shipped a machine on which this port
  *                 was usable/enabled ?)
  */

 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/serio.h>
 #include <linux/input.h>
 #include <linux/interrupt.h>
 #include <linux/spinlock.h>
 #include <linux/delay.h>
 #include <linux/ioport.h>
 #include <linux/pci_ids.h>

 #include <asm/irq.h>
 #include <asm/io.h>
 #include <asm/parisc-device.h>

 MODULE_AUTHOR("Laurent Canet <canetl@esiee.fr>, Thibaut Varene <varenet@parisc-linux.org>, Helge Deller <deller@gmx.de>");
 MODULE_DESCRIPTION("HP GSC PS2 port driver");
 MODULE_LICENSE("GPL");

 #define PFX "gscps2.c: "

 /*
  * Driver constants
  */

 /* various constants */
 #define ENABLE			1
 #define DISABLE			0

 #define GSC_DINO_OFFSET		0x0800	/* offset for DINO controller versus LASI one */

 /* PS/2 IO port offsets */
 #define GSC_ID			0x00	/* device ID offset (see: GSC_ID_XXX) */
 #define GSC_RESET		0x00	/* reset port offset */
 #define GSC_RCVDATA		0x04	/* receive port offset */
 #define GSC_XMTDATA		0x04	/* transmit port offset */
 #define GSC_CONTROL		0x08	/* see: Control register bits */
 #define GSC_STATUS		0x0C	/* see: Status register bits */

 /* Control register bits */
 #define GSC_CTRL_ENBL		0x01	/* enable interface */
 #define GSC_CTRL_LPBXR		0x02	/* loopback operation */
 #define GSC_CTRL_DIAG		0x20	/* directly control clock/data line */
 #define GSC_CTRL_DATDIR		0x40	/* data line direct control */
 #define GSC_CTRL_CLKDIR		0x80	/* clock line direct control */

 /* Status register bits */
 #define GSC_STAT_RBNE		0x01	/* Receive Buffer Not Empty */
 #define GSC_STAT_TBNE		0x02	/* Transmit Buffer Not Empty */
 #define GSC_STAT_TERR		0x04	/* Timeout Error */
 #define GSC_STAT_PERR		0x08	/* Parity Error */
 #define GSC_STAT_CMPINTR	0x10	/* Composite Interrupt = irq on any port */
 #define GSC_STAT_DATSHD		0x40	/* Data Line Shadow */
 #define GSC_STAT_CLKSHD		0x80	/* Clock Line Shadow */

 /* IDs returned by GSC_ID port register */
 #define GSC_ID_KEYBOARD		0	/* device ID values */
 #define GSC_ID_MOUSE		1


 static irqreturn_t gscps2_interrupt(int irq, void *dev);

 #define BUFFER_SIZE 0x0f

 /* GSC PS/2 port device struct */
 struct gscps2port {
 	struct list_head node;
 	struct parisc_device *padev;
 	struct serio *port;
 	spinlock_t lock;
 	char *addr;
 	u8 act, append; /* position in buffer[] */
 	struct {
 		u8 data;
 		u8 str;
 	} buffer[BUFFER_SIZE+1];
 	int id;
 };

 /*
  * Various HW level routines
  */

 #define gscps2_readb_input(x)		readb((x)+GSC_RCVDATA)
 #define gscps2_readb_control(x)		readb((x)+GSC_CONTROL)
 #define gscps2_readb_status(x)		readb((x)+GSC_STATUS)
 #define gscps2_writeb_control(x, y)	writeb((x), (y)+GSC_CONTROL)


 /*
  * wait_TBE() - wait for Transmit Buffer Empty
  */

 static int wait_TBE(char *addr)
 {
 	int timeout = 25000; /* device is expected to react within 250 msec */
 	while (gscps2_readb_status(addr) & GSC_STAT_TBNE) {
 		if (!--timeout)
 			return 0;	/* This should not happen */
 		udelay(10);
 	}
 	return 1;
 }


 /*
  * gscps2_flush() - flush the receive buffer
  */

 static void gscps2_flush(struct gscps2port *ps2port)
 {
 	while (gscps2_readb_status(ps2port->addr) & GSC_STAT_RBNE)
 		gscps2_readb_input(ps2port->addr);
 	ps2port->act = ps2port->append = 0;
 }

 /*
  * gscps2_writeb_output() - write a byte to the port
  *
  * returns 1 on success, 0 on error
  */

 static inline int gscps2_writeb_output(struct gscps2port *ps2port, u8 data)
 {
 	unsigned long flags;
 	char *addr = ps2port->addr;

 	if (!wait_TBE(addr)) {
 		printk(KERN_DEBUG PFX "timeout - could not write byte %#x\n", data);
 		return 0;
 	}

 	while (gscps2_readb_status(ps2port->addr) & GSC_STAT_RBNE)
 		/* wait */;

 	spin_lock_irqsave(&ps2port->lock, flags);
 	writeb(data, addr+GSC_XMTDATA);
 	spin_unlock_irqrestore(&ps2port->lock, flags);

 	/* this is ugly, but due to timing of the port it seems to be necessary. */
 	mdelay(6);

 	/* make sure any received data is returned as fast as possible */
 	/* this is important e.g. when we set the LEDs on the keyboard */
 	gscps2_interrupt(0, NULL);

 	return 1;
 }


 /*
  * gscps2_enable() - enables or disables the port
  */

 static void gscps2_enable(struct gscps2port *ps2port, int enable)
 {
 	unsigned long flags;
 	u8 data;

 	/* now enable/disable the port */
 	spin_lock_irqsave(&ps2port->lock, flags);
 	gscps2_flush(ps2port);
 	data = gscps2_readb_control(ps2port->addr);
 	if (enable)
 		data |= GSC_CTRL_ENBL;
 	else
 		data &= ~GSC_CTRL_ENBL;
 	gscps2_writeb_control(data, ps2port->addr);
 	spin_unlock_irqrestore(&ps2port->lock, flags);
 	wait_TBE(ps2port->addr);
 	gscps2_flush(ps2port);
 }

 /*
  * gscps2_reset() - resets the PS/2 port
  */

 static void gscps2_reset(struct gscps2port *ps2port)
 {
 	char *addr = ps2port->addr;
 	unsigned long flags;

 	/* reset the interface */
 	spin_lock_irqsave(&ps2port->lock, flags);
 	gscps2_flush(ps2port);
 	writeb(0xff, addr+GSC_RESET);
 	gscps2_flush(ps2port);
 	spin_unlock_irqrestore(&ps2port->lock, flags);
 }

 static LIST_HEAD(ps2port_list);

 /**
  * gscps2_interrupt() - Interruption service routine
  *
  * This function reads received PS/2 bytes and processes them on
  * all interfaces.
  * The problematic part here is, that the keyboard and mouse PS/2 port
  * share the same interrupt and it's not possible to send data if any
  * one of them holds input data. To solve this problem we try to receive
  * the data as fast as possible and handle the reporting to the upper layer
  * later.
  */

 static irqreturn_t gscps2_interrupt(int irq, void *dev)
 {
 	struct gscps2port *ps2port;

 	list_for_each_entry(ps2port, &ps2port_list, node) {

 	  unsigned long flags;
 	  spin_lock_irqsave(&ps2port->lock, flags);

 	  while ( (ps2port->buffer[ps2port->append].str =
 		   gscps2_readb_status(ps2port->addr)) & GSC_STAT_RBNE ) {
 		ps2port->buffer[ps2port->append].data =
 				gscps2_readb_input(ps2port->addr);
 		ps2port->append = ((ps2port->append+1) & BUFFER_SIZE);
 	  }

 	  spin_unlock_irqrestore(&ps2port->lock, flags);

 	} /* list_for_each_entry */

 	/* all data was read from the ports - now report the data to upper layer */

 	list_for_each_entry(ps2port, &ps2port_list, node) {

 	  while (ps2port->act != ps2port->append) {

 	    unsigned int rxflags;
 	    u8 data, status;

 	    /* Did new data arrived while we read existing data ?
 	       If yes, exit now and let the new irq handler start over again */
 	    if (gscps2_readb_status(ps2port->addr) & GSC_STAT_CMPINTR)
 		return IRQ_HANDLED;

 	    status = ps2port->buffer[ps2port->act].str;
 	    data   = ps2port->buffer[ps2port->act].data;

 	    ps2port->act = ((ps2port->act+1) & BUFFER_SIZE);
 	    rxflags =	((status & GSC_STAT_TERR) ? SERIO_TIMEOUT : 0 ) |
 			((status & GSC_STAT_PERR) ? SERIO_PARITY  : 0 );

 	    serio_interrupt(ps2port->port, data, rxflags);

 	  } /* while() */

 	} /* list_for_each_entry */

 	return IRQ_HANDLED;
 }


 /*
  * gscps2_write() - send a byte out through the aux interface.
  */

 static int gscps2_write(struct serio *port, unsigned char data)
 {
 	struct gscps2port *ps2port = port->port_data;

 	if (!gscps2_writeb_output(ps2port, data)) {
 		printk(KERN_DEBUG PFX "sending byte %#x failed.\n", data);
 		return -1;
 	}
 	return 0;
 }

 /*
  * gscps2_open() is called when a port is opened by the higher layer.
  * It resets and enables the port.
  */

 static int gscps2_open(struct serio *port)
 {
 	struct gscps2port *ps2port = port->port_data;

 	gscps2_reset(ps2port);

 	/* enable it */
 	gscps2_enable(ps2port, ENABLE);

 	gscps2_interrupt(0, NULL);

 	return 0;
 }

 /*
  * gscps2_close() disables the port
  */

 static void gscps2_close(struct serio *port)
 {
 	struct gscps2port *ps2port = port->port_data;
 	gscps2_enable(ps2port, DISABLE);
 }

 /**
  * gscps2_probe() - Probes PS2 devices
  * @return: success/error report
  */

 static int gscps2_probe(struct parisc_device *dev)
 {
 	struct gscps2port *ps2port;
 	struct serio *serio;
 	unsigned long hpa = dev->hpa.start;
 	int ret;

 	if (!dev->irq)
 		return -ENODEV;

 	/* Offset for DINO PS/2. Works with LASI even */
 	if (dev->id.sversion == 0x96)
 		hpa += GSC_DINO_OFFSET;

 	ps2port = kzalloc(sizeof(struct gscps2port), GFP_KERNEL);
 	serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
 	if (!ps2port || !serio) {
 		ret = -ENOMEM;
 		goto fail_nomem;
 	}

 	dev_set_drvdata(&dev->dev, ps2port);

 	ps2port->port = serio;
 	ps2port->padev = dev;
 	ps2port->addr = ioremap_nocache(hpa, GSC_STATUS + 4);
 	spin_lock_init(&ps2port->lock);

 	gscps2_reset(ps2port);
 	ps2port->id = readb(ps2port->addr + GSC_ID) & 0x0f;

 	snprintf(serio->name, sizeof(serio->name), "gsc-ps2-%s",
 		 (ps2port->id == GSC_ID_KEYBOARD) ? "keyboard" : "mouse");
 	strlcpy(serio->phys, dev_name(&dev->dev), sizeof(serio->phys));
 	serio->id.type		= SERIO_8042;
 	serio->write		= gscps2_write;
 	serio->open		= gscps2_open;
 	serio->close		= gscps2_close;
 	serio->port_data	= ps2port;
 	serio->dev.parent	= &dev->dev;

 	ret = -EBUSY;
 	if (request_irq(dev->irq, gscps2_interrupt, IRQF_SHARED, ps2port->port->name, ps2port))
 		goto fail_miserably;

 	if (ps2port->id != GSC_ID_KEYBOARD && ps2port->id != GSC_ID_MOUSE) {
 		printk(KERN_WARNING PFX "Unsupported PS/2 port at 0x%08lx (id=%d) ignored\n",
 				hpa, ps2port->id);
 		ret = -ENODEV;
 		goto fail;
 	}

 #if 0
 	if (!request_mem_region(hpa, GSC_STATUS + 4, ps2port->port.name))
 		goto fail;
 #endif

 	printk(KERN_INFO "serio: %s port at 0x%p irq %d @ %s\n",
 		ps2port->port->name,
 		ps2port->addr,
 		ps2port->padev->irq,
 		ps2port->port->phys);

 	serio_register_port(ps2port->port);

 	list_add_tail(&ps2port->node, &ps2port_list);

 	return 0;

 fail:
 	free_irq(dev->irq, ps2port);

 fail_miserably:
 	iounmap(ps2port->addr);
 	release_mem_region(dev->hpa.start, GSC_STATUS + 4);

 fail_nomem:
 	kfree(ps2port);
 	kfree(serio);
 	return ret;
 }

 /**
  * gscps2_remove() - Removes PS2 devices
  * @return: success/error report
  */

 static int gscps2_remove(struct parisc_device *dev)
 {
 	struct gscps2port *ps2port = dev_get_drvdata(&dev->dev);

 	serio_unregister_port(ps2port->port);
 	free_irq(dev->irq, ps2port);
 	gscps2_flush(ps2port);
 	list_del(&ps2port->node);
 	iounmap(ps2port->addr);
 #if 0
 	release_mem_region(dev->hpa, GSC_STATUS + 4);
 #endif
 	dev_set_drvdata(&dev->dev, NULL);
 	kfree(ps2port);
 	return 0;
 }


 static struct parisc_device_id gscps2_device_tbl[] = {
 	{ HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00084 }, /* LASI PS/2 */
 #ifdef DINO_TESTED
 	{ HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00096 }, /* DINO PS/2 */
 #endif
 	{ 0, }	/* 0 terminated list */
 };
 MODULE_DEVICE_TABLE(parisc, gscps2_device_tbl);

 static struct parisc_driver parisc_ps2_driver = {
 	.name		= "gsc_ps2",
 	.id_table	= gscps2_device_tbl,
 	.probe		= gscps2_probe,
 	.remove		= gscps2_remove,
 };

 static int __init gscps2_init(void)
 {
 	register_parisc_driver(&parisc_ps2_driver);
 	return 0;
 }

 static void __exit gscps2_exit(void)
 {
 	unregister_parisc_driver(&parisc_ps2_driver);
 }


 module_init(gscps2_init);
 module_exit(gscps2_exit);
	/*
	* drivers/input/serio/gscps2.c
	*
	* Copyright (c) 2004-2006 Helge Deller <deller@gmx.de>
	* Copyright (c) 2002 Laurent Canet <canetl@esiee.fr>
	* Copyright (c) 2002 Thibaut Varene <varenet@parisc-linux.org>
	*
	* Pieces of code based on linux-2.4's hp_mouse.c & hp_keyb.c
	* Copyright (c) 1999 Alex deVries <alex@onefishtwo.ca>
	* Copyright (c) 1999-2000 Philipp Rumpf <prumpf@tux.org>
	* Copyright (c) 2000 Xavier Debacker <debackex@esiee.fr>
	* Copyright (c) 2000-2001 Thomas Marteau <marteaut@esiee.fr>
	*
	* HP GSC PS/2 port driver, found in PA/RISC Workstations
	*
	* This file is subject to the terms and conditions of the GNU General Public
	* License. See the file "COPYING" in the main directory of this archive
	* for more details.
	*
	* TODO:
	* - Dino testing (did HP ever shipped a machine on which this port
	* was usable/enabled ?)
	*/

	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/slab.h>
	#include <linux/serio.h>
	#include <linux/input.h>
	#include <linux/interrupt.h>
	#include <linux/spinlock.h>
	#include <linux/delay.h>
	#include <linux/ioport.h>
	#include <linux/pci_ids.h>

	#include <asm/irq.h>
	#include <asm/io.h>
	#include <asm/parisc-device.h>

	MODULE_AUTHOR("Laurent Canet <canetl@esiee.fr>, Thibaut Varene <varenet@parisc-linux.org>, Helge Deller <deller@gmx.de>");
	MODULE_DESCRIPTION("HP GSC PS2 port driver");
	MODULE_LICENSE("GPL");

	#define PFX "gscps2.c: "

	/*
	* Driver constants
	*/

	/* various constants */
	#define ENABLE 1
	#define DISABLE 0

	#define GSC_DINO_OFFSET 0x0800 /* offset for DINO controller versus LASI one */

	/* PS/2 IO port offsets */
	#define GSC_ID 0x00 /* device ID offset (see: GSC_ID_XXX) */
	#define GSC_RESET 0x00 /* reset port offset */
	#define GSC_RCVDATA 0x04 /* receive port offset */
	#define GSC_XMTDATA 0x04 /* transmit port offset */
	#define GSC_CONTROL 0x08 /* see: Control register bits */
	#define GSC_STATUS 0x0C /* see: Status register bits */

	/* Control register bits */
	#define GSC_CTRL_ENBL 0x01 /* enable interface */
	#define GSC_CTRL_LPBXR 0x02 /* loopback operation */
	#define GSC_CTRL_DIAG 0x20 /* directly control clock/data line */
	#define GSC_CTRL_DATDIR 0x40 /* data line direct control */
	#define GSC_CTRL_CLKDIR 0x80 /* clock line direct control */

	/* Status register bits */
	#define GSC_STAT_RBNE 0x01 /* Receive Buffer Not Empty */
	#define GSC_STAT_TBNE 0x02 /* Transmit Buffer Not Empty */
	#define GSC_STAT_TERR 0x04 /* Timeout Error */
	#define GSC_STAT_PERR 0x08 /* Parity Error */
	#define GSC_STAT_CMPINTR 0x10 /* Composite Interrupt = irq on any port */
	#define GSC_STAT_DATSHD 0x40 /* Data Line Shadow */
	#define GSC_STAT_CLKSHD 0x80 /* Clock Line Shadow */

	/* IDs returned by GSC_ID port register */
	#define GSC_ID_KEYBOARD 0 /* device ID values */
	#define GSC_ID_MOUSE 1


	static irqreturn_t gscps2_interrupt(int irq, void *dev);

	#define BUFFER_SIZE 0x0f

	/* GSC PS/2 port device struct */
	struct gscps2port {
	struct list_head node;
	struct parisc_device *padev;
	struct serio *port;
	spinlock_t lock;
	char *addr;
	u8 act, append; /* position in buffer[] */
	struct {
	u8 data;
	u8 str;
	} buffer[BUFFER_SIZE+1];
	int id;
	};

	/*
	* Various HW level routines
	*/

	#define gscps2_readb_input(x) readb((x)+GSC_RCVDATA)
	#define gscps2_readb_control(x) readb((x)+GSC_CONTROL)
	#define gscps2_readb_status(x) readb((x)+GSC_STATUS)
	#define gscps2_writeb_control(x, y) writeb((x), (y)+GSC_CONTROL)


	/*
	* wait_TBE() - wait for Transmit Buffer Empty
	*/

	static int wait_TBE(char *addr)
	{
	int timeout = 25000; /* device is expected to react within 250 msec */
	while (gscps2_readb_status(addr) & GSC_STAT_TBNE) {
	if (!--timeout)
	return 0; /* This should not happen */
	udelay(10);
	}
	return 1;
	}


	/*
	* gscps2_flush() - flush the receive buffer
	*/

	static void gscps2_flush(struct gscps2port *ps2port)
	{
	while (gscps2_readb_status(ps2port->addr) & GSC_STAT_RBNE)
	gscps2_readb_input(ps2port->addr);
	ps2port->act = ps2port->append = 0;
	}

	/*
	* gscps2_writeb_output() - write a byte to the port
	*
	* returns 1 on success, 0 on error
	*/

	static inline int gscps2_writeb_output(struct gscps2port *ps2port, u8 data)
	{
	unsigned long flags;
	char *addr = ps2port->addr;

	if (!wait_TBE(addr)) {
	printk(KERN_DEBUG PFX "timeout - could not write byte %#x\n", data);
	return 0;
	}

	while (gscps2_readb_status(ps2port->addr) & GSC_STAT_RBNE)
	/* wait */;

	spin_lock_irqsave(&ps2port->lock, flags);
	writeb(data, addr+GSC_XMTDATA);
	spin_unlock_irqrestore(&ps2port->lock, flags);

	/* this is ugly, but due to timing of the port it seems to be necessary. */
	mdelay(6);

	/* make sure any received data is returned as fast as possible */
	/* this is important e.g. when we set the LEDs on the keyboard */
	gscps2_interrupt(0, NULL);

	return 1;
	}


	/*
	* gscps2_enable() - enables or disables the port
	*/

	static void gscps2_enable(struct gscps2port *ps2port, int enable)
	{
	unsigned long flags;
	u8 data;

	/* now enable/disable the port */
	spin_lock_irqsave(&ps2port->lock, flags);
	gscps2_flush(ps2port);
	data = gscps2_readb_control(ps2port->addr);
	if (enable)
	data \|= GSC_CTRL_ENBL;
	else
	data &= ~GSC_CTRL_ENBL;
	gscps2_writeb_control(data, ps2port->addr);
	spin_unlock_irqrestore(&ps2port->lock, flags);
	wait_TBE(ps2port->addr);
	gscps2_flush(ps2port);
	}

	/*
	* gscps2_reset() - resets the PS/2 port
	*/

	static void gscps2_reset(struct gscps2port *ps2port)
	{
	char *addr = ps2port->addr;
	unsigned long flags;

	/* reset the interface */
	spin_lock_irqsave(&ps2port->lock, flags);
	gscps2_flush(ps2port);
	writeb(0xff, addr+GSC_RESET);
	gscps2_flush(ps2port);
	spin_unlock_irqrestore(&ps2port->lock, flags);
	}

	static LIST_HEAD(ps2port_list);

	/**
	* gscps2_interrupt() - Interruption service routine
	*
	* This function reads received PS/2 bytes and processes them on
	* all interfaces.
	* The problematic part here is, that the keyboard and mouse PS/2 port
	* share the same interrupt and it's not possible to send data if any
	* one of them holds input data. To solve this problem we try to receive
	* the data as fast as possible and handle the reporting to the upper layer
	* later.
	*/

	static irqreturn_t gscps2_interrupt(int irq, void *dev)
	{
	struct gscps2port *ps2port;

	list_for_each_entry(ps2port, &ps2port_list, node) {

	unsigned long flags;
	spin_lock_irqsave(&ps2port->lock, flags);

	while ( (ps2port->buffer[ps2port->append].str =
	gscps2_readb_status(ps2port->addr)) & GSC_STAT_RBNE ) {
	ps2port->buffer[ps2port->append].data =
	gscps2_readb_input(ps2port->addr);
	ps2port->append = ((ps2port->append+1) & BUFFER_SIZE);
	}

	spin_unlock_irqrestore(&ps2port->lock, flags);

	} /* list_for_each_entry */

	/* all data was read from the ports - now report the data to upper layer */

	list_for_each_entry(ps2port, &ps2port_list, node) {

	while (ps2port->act != ps2port->append) {

	unsigned int rxflags;
	u8 data, status;

	/* Did new data arrived while we read existing data ?
	If yes, exit now and let the new irq handler start over again */
	if (gscps2_readb_status(ps2port->addr) & GSC_STAT_CMPINTR)
	return IRQ_HANDLED;

	status = ps2port->buffer[ps2port->act].str;
	data = ps2port->buffer[ps2port->act].data;

	ps2port->act = ((ps2port->act+1) & BUFFER_SIZE);
	rxflags = ((status & GSC_STAT_TERR) ? SERIO_TIMEOUT : 0 ) \|
	((status & GSC_STAT_PERR) ? SERIO_PARITY : 0 );

	serio_interrupt(ps2port->port, data, rxflags);

	} /* while() */

	} /* list_for_each_entry */

	return IRQ_HANDLED;
	}


	/*
	* gscps2_write() - send a byte out through the aux interface.
	*/

	static int gscps2_write(struct serio *port, unsigned char data)
	{
	struct gscps2port *ps2port = port->port_data;

	if (!gscps2_writeb_output(ps2port, data)) {
	printk(KERN_DEBUG PFX "sending byte %#x failed.\n", data);
	return -1;
	}
	return 0;
	}

	/*
	* gscps2_open() is called when a port is opened by the higher layer.
	* It resets and enables the port.
	*/

	static int gscps2_open(struct serio *port)
	{
	struct gscps2port *ps2port = port->port_data;

	gscps2_reset(ps2port);

	/* enable it */
	gscps2_enable(ps2port, ENABLE);

	gscps2_interrupt(0, NULL);

	return 0;
	}

	/*
	* gscps2_close() disables the port
	*/

	static void gscps2_close(struct serio *port)
	{
	struct gscps2port *ps2port = port->port_data;
	gscps2_enable(ps2port, DISABLE);
	}

	/**
	* gscps2_probe() - Probes PS2 devices
	* @return: success/error report
	*/

	static int gscps2_probe(struct parisc_device *dev)
	{
	struct gscps2port *ps2port;
	struct serio *serio;
	unsigned long hpa = dev->hpa.start;
	int ret;

	if (!dev->irq)
	return -ENODEV;

	/* Offset for DINO PS/2. Works with LASI even */
	if (dev->id.sversion == 0x96)
	hpa += GSC_DINO_OFFSET;

	ps2port = kzalloc(sizeof(struct gscps2port), GFP_KERNEL);
	serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
	if (!ps2port \|\| !serio) {
	ret = -ENOMEM;
	goto fail_nomem;
	}

	dev_set_drvdata(&dev->dev, ps2port);

	ps2port->port = serio;
	ps2port->padev = dev;
	ps2port->addr = ioremap_nocache(hpa, GSC_STATUS + 4);
	spin_lock_init(&ps2port->lock);

	gscps2_reset(ps2port);
	ps2port->id = readb(ps2port->addr + GSC_ID) & 0x0f;

	snprintf(serio->name, sizeof(serio->name), "gsc-ps2-%s",
	(ps2port->id == GSC_ID_KEYBOARD) ? "keyboard" : "mouse");
	strlcpy(serio->phys, dev_name(&dev->dev), sizeof(serio->phys));
	serio->id.type = SERIO_8042;
	serio->write = gscps2_write;
	serio->open = gscps2_open;
	serio->close = gscps2_close;
	serio->port_data = ps2port;
	serio->dev.parent = &dev->dev;

	ret = -EBUSY;
	if (request_irq(dev->irq, gscps2_interrupt, IRQF_SHARED, ps2port->port->name, ps2port))
	goto fail_miserably;

	if (ps2port->id != GSC_ID_KEYBOARD && ps2port->id != GSC_ID_MOUSE) {
	printk(KERN_WARNING PFX "Unsupported PS/2 port at 0x%08lx (id=%d) ignored\n",
	hpa, ps2port->id);
	ret = -ENODEV;
	goto fail;
	}

	#if 0
	if (!request_mem_region(hpa, GSC_STATUS + 4, ps2port->port.name))
	goto fail;
	#endif

	printk(KERN_INFO "serio: %s port at 0x%p irq %d @ %s\n",
	ps2port->port->name,
	ps2port->addr,
	ps2port->padev->irq,
	ps2port->port->phys);

	serio_register_port(ps2port->port);

	list_add_tail(&ps2port->node, &ps2port_list);

	return 0;

	fail:
	free_irq(dev->irq, ps2port);

	fail_miserably:
	iounmap(ps2port->addr);
	release_mem_region(dev->hpa.start, GSC_STATUS + 4);

	fail_nomem:
	kfree(ps2port);
	kfree(serio);
	return ret;
	}

	/**
	* gscps2_remove() - Removes PS2 devices
	* @return: success/error report
	*/

	static int gscps2_remove(struct parisc_device *dev)
	{
	struct gscps2port *ps2port = dev_get_drvdata(&dev->dev);

	serio_unregister_port(ps2port->port);
	free_irq(dev->irq, ps2port);
	gscps2_flush(ps2port);
	list_del(&ps2port->node);
	iounmap(ps2port->addr);
	#if 0
	release_mem_region(dev->hpa, GSC_STATUS + 4);
	#endif
	dev_set_drvdata(&dev->dev, NULL);
	kfree(ps2port);
	return 0;
	}


	static struct parisc_device_id gscps2_device_tbl[] = {
	{ HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00084 }, /* LASI PS/2 */
	#ifdef DINO_TESTED
	{ HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00096 }, /* DINO PS/2 */
	#endif
	{ 0, } /* 0 terminated list */
	};
	MODULE_DEVICE_TABLE(parisc, gscps2_device_tbl);

	static struct parisc_driver parisc_ps2_driver = {
	.name = "gsc_ps2",
	.id_table = gscps2_device_tbl,
	.probe = gscps2_probe,
	.remove = gscps2_remove,
	};

	static int __init gscps2_init(void)
	{
	register_parisc_driver(&parisc_ps2_driver);
	return 0;
	}

	static void __exit gscps2_exit(void)
	{
	unregister_parisc_driver(&parisc_ps2_driver);
	}


	module_init(gscps2_init);
	module_exit(gscps2_exit);