[deliverable/linux.git] / drivers / input / serio / gscps2.c

/*
 * 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/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");
MODULE_DEVICE_TABLE(parisc, gscps2_device_tbl);

#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 sucess, 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 __init 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 PS/2 %s",
		 (ps2port->id == GSC_ID_KEYBOARD) ? "keyboard" : "mouse");
	strlcpy(serio->phys, dev->dev.bus_id, 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 __devexit 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 */
};

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);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* drivers/input/serio/gscps2.c
	3	*
5076c158	4	* Copyright (c) 2004-2006 Helge Deller <deller@gmx.de>
1da177e4 LT	5	* Copyright (c) 2002 Laurent Canet <canetl@esiee.fr>
	6	* Copyright (c) 2002 Thibaut Varene <varenet@parisc-linux.org>
	7	*
	8	* Pieces of code based on linux-2.4's hp_mouse.c & hp_keyb.c
	9	* Copyright (c) 1999 Alex deVries <alex@onefishtwo.ca>
	10	* Copyright (c) 1999-2000 Philipp Rumpf <prumpf@tux.org>
	11	* Copyright (c) 2000 Xavier Debacker <debackex@esiee.fr>
	12	* Copyright (c) 2000-2001 Thomas Marteau <marteaut@esiee.fr>
	13	*
	14	* HP GSC PS/2 port driver, found in PA/RISC Workstations
	15	*
	16	* This file is subject to the terms and conditions of the GNU General Public
	17	* License. See the file "COPYING" in the main directory of this archive
	18	* for more details.
	19	*
	20	* TODO:
	21	* - Dino testing (did HP ever shipped a machine on which this port
	22	* was usable/enabled ?)
	23	*/
	24
1da177e4 LT	25	#include <linux/init.h>
	26	#include <linux/module.h>
	27	#include <linux/serio.h>
	28	#include <linux/input.h>
	29	#include <linux/interrupt.h>
	30	#include <linux/spinlock.h>
	31	#include <linux/delay.h>
	32	#include <linux/ioport.h>
	33	#include <linux/pci_ids.h>
	34
	35	#include <asm/irq.h>
	36	#include <asm/io.h>
	37	#include <asm/parisc-device.h>
	38
	39	MODULE_AUTHOR("Laurent Canet <canetl@esiee.fr>, Thibaut Varene <varenet@parisc-linux.org>, Helge Deller <deller@gmx.de>");
	40	MODULE_DESCRIPTION("HP GSC PS2 port driver");
	41	MODULE_LICENSE("GPL");
	42	MODULE_DEVICE_TABLE(parisc, gscps2_device_tbl);
	43
	44	#define PFX "gscps2.c: "
	45
	46	/*
	47	* Driver constants
	48	*/
	49
	50	/* various constants */
	51	#define ENABLE 1
	52	#define DISABLE 0
	53
	54	#define GSC_DINO_OFFSET 0x0800 /* offset for DINO controller versus LASI one */
	55
	56	/* PS/2 IO port offsets */
	57	#define GSC_ID 0x00 /* device ID offset (see: GSC_ID_XXX) */
	58	#define GSC_RESET 0x00 /* reset port offset */
	59	#define GSC_RCVDATA 0x04 /* receive port offset */
	60	#define GSC_XMTDATA 0x04 /* transmit port offset */
	61	#define GSC_CONTROL 0x08 /* see: Control register bits */
	62	#define GSC_STATUS 0x0C /* see: Status register bits */
	63
	64	/* Control register bits */
	65	#define GSC_CTRL_ENBL 0x01 /* enable interface */
	66	#define GSC_CTRL_LPBXR 0x02 /* loopback operation */
	67	#define GSC_CTRL_DIAG 0x20 /* directly control clock/data line */
	68	#define GSC_CTRL_DATDIR 0x40 /* data line direct control */
	69	#define GSC_CTRL_CLKDIR 0x80 /* clock line direct control */
	70
	71	/* Status register bits */
	72	#define GSC_STAT_RBNE 0x01 /* Receive Buffer Not Empty */
	73	#define GSC_STAT_TBNE 0x02 /* Transmit Buffer Not Empty */
	74	#define GSC_STAT_TERR 0x04 /* Timeout Error */
	75	#define GSC_STAT_PERR 0x08 /* Parity Error */
	76	#define GSC_STAT_CMPINTR 0x10 /* Composite Interrupt = irq on any port */
	77	#define GSC_STAT_DATSHD 0x40 /* Data Line Shadow */
	78	#define GSC_STAT_CLKSHD 0x80 /* Clock Line Shadow */
	79
	80	/* IDs returned by GSC_ID port register */
	81	#define GSC_ID_KEYBOARD 0 /* device ID values */
	82	#define GSC_ID_MOUSE 1
	83
	84
7d12e780	85	static irqreturn_t gscps2_interrupt(int irq, void *dev);
1da177e4 LT	86
	87	#define BUFFER_SIZE 0x0f
	88
	89	/* GSC PS/2 port device struct */
	90	struct gscps2port {
	91	struct list_head node;
	92	struct parisc_device *padev;
	93	struct serio *port;
	94	spinlock_t lock;
	95	char *addr;
	96	u8 act, append; /* position in buffer[] */
	97	struct {
	98	u8 data;
	99	u8 str;
	100	} buffer[BUFFER_SIZE+1];
	101	int id;
	102	};
	103
	104	/*
	105	* Various HW level routines
	106	*/
	107
	108	#define gscps2_readb_input(x) readb((x)+GSC_RCVDATA)
	109	#define gscps2_readb_control(x) readb((x)+GSC_CONTROL)
	110	#define gscps2_readb_status(x) readb((x)+GSC_STATUS)
	111	#define gscps2_writeb_control(x, y) writeb((x), (y)+GSC_CONTROL)
	112
	113
	114	/*
	115	* wait_TBE() - wait for Transmit Buffer Empty
	116	*/
	117
	118	static int wait_TBE(char *addr)
	119	{
	120	int timeout = 25000; /* device is expected to react within 250 msec */
	121	while (gscps2_readb_status(addr) & GSC_STAT_TBNE) {
	122	if (!--timeout)
	123	return 0; /* This should not happen */
	124	udelay(10);
	125	}
	126	return 1;
	127	}
	128
	129
	130	/*
	131	* gscps2_flush() - flush the receive buffer
	132	*/
	133
	134	static void gscps2_flush(struct gscps2port *ps2port)
	135	{
	136	while (gscps2_readb_status(ps2port->addr) & GSC_STAT_RBNE)
	137	gscps2_readb_input(ps2port->addr);
	138	ps2port->act = ps2port->append = 0;
	139	}
	140
	141	/*
	142	* gscps2_writeb_output() - write a byte to the port
	143	*
	144	* returns 1 on sucess, 0 on error
	145	*/
	146
	147	static inline int gscps2_writeb_output(struct gscps2port *ps2port, u8 data)
	148	{
	149	unsigned long flags;
150	char *addr = ps2port->addr;
151
152	if (!wait_TBE(addr)) {
153	printk(KERN_DEBUG PFX "timeout - could not write byte %#x\n", data);
154	return 0;
155	}
156
157	while (gscps2_readb_status(ps2port->addr) & GSC_STAT_RBNE)
158	/* wait */;
159
160	spin_lock_irqsave(&ps2port->lock, flags);
161	writeb(data, addr+GSC_XMTDATA);
162	spin_unlock_irqrestore(&ps2port->lock, flags);
163
164	/* this is ugly, but due to timing of the port it seems to be necessary. */
165	mdelay(6);
166
167	/* make sure any received data is returned as fast as possible */
168	/* this is important e.g. when we set the LEDs on the keyboard */
be577a52	169	gscps2_interrupt(0, NULL);
1da177e4 LT	170
	171	return 1;
	172	}
	173
	174
	175	/*
	176	* gscps2_enable() - enables or disables the port
	177	*/
	178
	179	static void gscps2_enable(struct gscps2port *ps2port, int enable)
	180	{
	181	unsigned long flags;
	182	u8 data;
	183
	184	/* now enable/disable the port */
	185	spin_lock_irqsave(&ps2port->lock, flags);
	186	gscps2_flush(ps2port);
	187	data = gscps2_readb_control(ps2port->addr);
	188	if (enable)
	189	data \|= GSC_CTRL_ENBL;
	190	else
	191	data &= ~GSC_CTRL_ENBL;
	192	gscps2_writeb_control(data, ps2port->addr);
	193	spin_unlock_irqrestore(&ps2port->lock, flags);
	194	wait_TBE(ps2port->addr);
	195	gscps2_flush(ps2port);
	196	}
	197
	198	/*
	199	* gscps2_reset() - resets the PS/2 port
	200	*/
	201
	202	static void gscps2_reset(struct gscps2port *ps2port)
	203	{
	204	char *addr = ps2port->addr;
	205	unsigned long flags;
	206
	207	/* reset the interface */
	208	spin_lock_irqsave(&ps2port->lock, flags);
	209	gscps2_flush(ps2port);
	210	writeb(0xff, addr+GSC_RESET);
	211	gscps2_flush(ps2port);
	212	spin_unlock_irqrestore(&ps2port->lock, flags);
1da177e4 LT	213	}
	214
	215	static LIST_HEAD(ps2port_list);
	216
	217	/**
	218	* gscps2_interrupt() - Interruption service routine
	219	*
	220	* This function reads received PS/2 bytes and processes them on
	221	* all interfaces.
	222	* The problematic part here is, that the keyboard and mouse PS/2 port
	223	* share the same interrupt and it's not possible to send data if any
	224	* one of them holds input data. To solve this problem we try to receive
	225	* the data as fast as possible and handle the reporting to the upper layer
	226	* later.
	227	*/
	228
7d12e780	229	static irqreturn_t gscps2_interrupt(int irq, void *dev)
1da177e4 LT	230	{
	231	struct gscps2port *ps2port;
	232
	233	list_for_each_entry(ps2port, &ps2port_list, node) {
	234
	235	unsigned long flags;
	236	spin_lock_irqsave(&ps2port->lock, flags);
	237
	238	while ( (ps2port->buffer[ps2port->append].str =
	239	gscps2_readb_status(ps2port->addr)) & GSC_STAT_RBNE ) {
	240	ps2port->buffer[ps2port->append].data =
	241	gscps2_readb_input(ps2port->addr);
	242	ps2port->append = ((ps2port->append+1) & BUFFER_SIZE);
	243	}
	244
	245	spin_unlock_irqrestore(&ps2port->lock, flags);
	246
	247	} /* list_for_each_entry */
	248
	249	/* all data was read from the ports - now report the data to upper layer */
	250
	251	list_for_each_entry(ps2port, &ps2port_list, node) {
	252
	253	while (ps2port->act != ps2port->append) {
	254
	255	unsigned int rxflags;
	256	u8 data, status;
	257
	258	/* Did new data arrived while we read existing data ?
	259	If yes, exit now and let the new irq handler start over again */
	260	if (gscps2_readb_status(ps2port->addr) & GSC_STAT_CMPINTR)
	261	return IRQ_HANDLED;
	262
	263	status = ps2port->buffer[ps2port->act].str;
	264	data = ps2port->buffer[ps2port->act].data;
	265
	266	ps2port->act = ((ps2port->act+1) & BUFFER_SIZE);
	267	rxflags = ((status & GSC_STAT_TERR) ? SERIO_TIMEOUT : 0 ) \|
	268	((status & GSC_STAT_PERR) ? SERIO_PARITY : 0 );
	269
7d12e780	270	serio_interrupt(ps2port->port, data, rxflags);
1da177e4 LT	271
	272	} /* while() */
	273
	274	} /* list_for_each_entry */
	275
	276	return IRQ_HANDLED;
	277	}
	278
	279
	280	/*
	281	* gscps2_write() - send a byte out through the aux interface.
	282	*/
	283
	284	static int gscps2_write(struct serio *port, unsigned char data)
	285	{
	286	struct gscps2port *ps2port = port->port_data;
	287
	288	if (!gscps2_writeb_output(ps2port, data)) {
	289	printk(KERN_DEBUG PFX "sending byte %#x failed.\n", data);
	290	return -1;
	291	}
	292	return 0;
	293	}
	294
	295	/*
	296	* gscps2_open() is called when a port is opened by the higher layer.
	297	* It resets and enables the port.
	298	*/
	299
	300	static int gscps2_open(struct serio *port)
	301	{
	302	struct gscps2port *ps2port = port->port_data;
	303
	304	gscps2_reset(ps2port);
	305
6ab0f5cd MW	306	/* enable it */
	307	gscps2_enable(ps2port, ENABLE);
	308
be577a52	309	gscps2_interrupt(0, NULL);
1da177e4 LT	310
	311	return 0;
	312	}
	313
	314	/*
	315	* gscps2_close() disables the port
	316	*/
	317
	318	static void gscps2_close(struct serio *port)
	319	{
	320	struct gscps2port *ps2port = port->port_data;
	321	gscps2_enable(ps2port, DISABLE);
	322	}
	323
	324	/**
	325	* gscps2_probe() - Probes PS2 devices
	326	* @return: success/error report
	327	*/
	328
	329	static int __init gscps2_probe(struct parisc_device *dev)
	330	{
	331	struct gscps2port *ps2port;
	332	struct serio *serio;
53f01bba	333	unsigned long hpa = dev->hpa.start;
1da177e4 LT	334	int ret;
	335
	336	if (!dev->irq)
	337	return -ENODEV;
	338
	339	/* Offset for DINO PS/2. Works with LASI even */
	340	if (dev->id.sversion == 0x96)
	341	hpa += GSC_DINO_OFFSET;
	342
7460caf3 MK	343	ps2port = kzalloc(sizeof(struct gscps2port), GFP_KERNEL);
7460caf3 MK	344	serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
1da177e4 LT	345	if (!ps2port \|\| !serio) {
	346	ret = -ENOMEM;
	347	goto fail_nomem;
	348	}
	349
	350	dev_set_drvdata(&dev->dev, ps2port);
	351
1da177e4 LT	352	ps2port->port = serio;
1da177e4 LT	353	ps2port->padev = dev;
5076c158	354	ps2port->addr = ioremap_nocache(hpa, GSC_STATUS + 4);
1da177e4 LT	355	spin_lock_init(&ps2port->lock);
	356
	357	gscps2_reset(ps2port);
	358	ps2port->id = readb(ps2port->addr + GSC_ID) & 0x0f;
	359
	360	snprintf(serio->name, sizeof(serio->name), "GSC PS/2 %s",
	361	(ps2port->id == GSC_ID_KEYBOARD) ? "keyboard" : "mouse");
	362	strlcpy(serio->phys, dev->dev.bus_id, sizeof(serio->phys));
	363	serio->id.type = SERIO_8042;
	364	serio->write = gscps2_write;
	365	serio->open = gscps2_open;
	366	serio->close = gscps2_close;
	367	serio->port_data = ps2port;
	368	serio->dev.parent = &dev->dev;
	369
1da177e4	370	ret = -EBUSY;
dace1453	371	if (request_irq(dev->irq, gscps2_interrupt, IRQF_SHARED, ps2port->port->name, ps2port))
1da177e4 LT	372	goto fail_miserably;
	373
	374	if (ps2port->id != GSC_ID_KEYBOARD && ps2port->id != GSC_ID_MOUSE) {
	375	printk(KERN_WARNING PFX "Unsupported PS/2 port at 0x%08lx (id=%d) ignored\n",
	376	hpa, ps2port->id);
	377	ret = -ENODEV;
	378	goto fail;
	379	}
	380
	381	#if 0
	382	if (!request_mem_region(hpa, GSC_STATUS + 4, ps2port->port.name))
	383	goto fail;
	384	#endif
	385
	386	printk(KERN_INFO "serio: %s port at 0x%p irq %d @ %s\n",
	387	ps2port->port->name,
	388	ps2port->addr,
	389	ps2port->padev->irq,
	390	ps2port->port->phys);
	391
	392	serio_register_port(ps2port->port);
	393
6ab0f5cd MW	394	list_add_tail(&ps2port->node, &ps2port_list);
6ab0f5cd MW	395
1da177e4 LT	396	return 0;
	397
	398	fail:
	399	free_irq(dev->irq, ps2port);
	400
	401	fail_miserably:
1da177e4	402	iounmap(ps2port->addr);
6ab0f5cd	403	release_mem_region(dev->hpa.start, GSC_STATUS + 4);
1da177e4 LT	404
	405	fail_nomem:
	406	kfree(ps2port);
	407	kfree(serio);
	408	return ret;
	409	}
	410
	411	/**
	412	* gscps2_remove() - Removes PS2 devices
	413	* @return: success/error report
	414	*/
	415
	416	static int __devexit gscps2_remove(struct parisc_device *dev)
	417	{
	418	struct gscps2port *ps2port = dev_get_drvdata(&dev->dev);
	419
	420	serio_unregister_port(ps2port->port);
	421	free_irq(dev->irq, ps2port);
	422	gscps2_flush(ps2port);
	423	list_del(&ps2port->node);
	424	iounmap(ps2port->addr);
	425	#if 0
	426	release_mem_region(dev->hpa, GSC_STATUS + 4);
	427	#endif
	428	dev_set_drvdata(&dev->dev, NULL);
	429	kfree(ps2port);
	430	return 0;
	431	}
	432
	433
	434	static struct parisc_device_id gscps2_device_tbl[] = {
	435	{ HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00084 }, /* LASI PS/2 */
	436	#ifdef DINO_TESTED
	437	{ HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00096 }, /* DINO PS/2 */
	438	#endif
	439	{ 0, } /* 0 terminated list */
	440	};
	441
	442	static struct parisc_driver parisc_ps2_driver = {
bdad1f83	443	.name = "gsc_ps2",
1da177e4 LT	444	.id_table = gscps2_device_tbl,
	445	.probe = gscps2_probe,
	446	.remove = gscps2_remove,
	447	};
	448
	449	static int __init gscps2_init(void)
	450	{
	451	register_parisc_driver(&parisc_ps2_driver);
	452	return 0;
	453	}
	454
	455	static void __exit gscps2_exit(void)
	456	{
	457	unregister_parisc_driver(&parisc_ps2_driver);
	458	}
	459
	460
	461	module_init(gscps2_init);
	462	module_exit(gscps2_exit);
	463