[mirror_ubuntu-focal-kernel.git] / drivers / input / serio / q40kbd.c

/*
 *  Copyright (c) 2000-2001 Vojtech Pavlik
 *
 *  Based on the work of:
 *	Richard Zidlicky <Richard.Zidlicky@stud.informatik.uni-erlangen.de>
 */

/*
 * Q40 PS/2 keyboard controller driver for Linux/m68k
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Should you need to contact me, the author, you can do so either by
 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/serio.h>
#include <linux/interrupt.h>
#include <linux/err.h>
#include <linux/bitops.h>
#include <linux/platform_device.h>

#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/q40_master.h>
#include <asm/irq.h>
#include <asm/q40ints.h>

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver");
MODULE_LICENSE("GPL");

static DEFINE_SPINLOCK(q40kbd_lock);
static struct serio *q40kbd_port;
static struct platform_device *q40kbd_device;

static irqreturn_t q40kbd_interrupt(int irq, void *dev_id)
{
	unsigned long flags;

	spin_lock_irqsave(&q40kbd_lock, flags);

	if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))
		serio_interrupt(q40kbd_port, master_inb(KEYCODE_REG), 0);

	master_outb(-1, KEYBOARD_UNLOCK_REG);

	spin_unlock_irqrestore(&q40kbd_lock, flags);

	return IRQ_HANDLED;
}

/*
 * q40kbd_flush() flushes all data that may be in the keyboard buffers
 */

static void q40kbd_flush(void)
{
	int maxread = 100;
	unsigned long flags;

	spin_lock_irqsave(&q40kbd_lock, flags);

	while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)))
		master_inb(KEYCODE_REG);

	spin_unlock_irqrestore(&q40kbd_lock, flags);
}

/*
 * q40kbd_open() is called when a port is open by the higher layer.
 * It allocates the interrupt and enables in in the chip.
 */

static int q40kbd_open(struct serio *port)
{
	q40kbd_flush();

	if (request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0, "q40kbd", NULL)) {
		printk(KERN_ERR "q40kbd.c: Can't get irq %d.\n", Q40_IRQ_KEYBOARD);
		return -EBUSY;
	}

	/* off we go */
	master_outb(-1, KEYBOARD_UNLOCK_REG);
	master_outb(1, KEY_IRQ_ENABLE_REG);

	return 0;
}

static void q40kbd_close(struct serio *port)
{
	master_outb(0, KEY_IRQ_ENABLE_REG);
	master_outb(-1, KEYBOARD_UNLOCK_REG);
	free_irq(Q40_IRQ_KEYBOARD, NULL);

	q40kbd_flush();
}

static int __devinit q40kbd_probe(struct platform_device *dev)
{
	q40kbd_port = kzalloc(sizeof(struct serio), GFP_KERNEL);
	if (!q40kbd_port)
		return -ENOMEM;

	q40kbd_port->id.type	= SERIO_8042;
	q40kbd_port->open	= q40kbd_open;
	q40kbd_port->close	= q40kbd_close;
	q40kbd_port->dev.parent	= &dev->dev;
	strlcpy(q40kbd_port->name, "Q40 Kbd Port", sizeof(q40kbd_port->name));
	strlcpy(q40kbd_port->phys, "Q40", sizeof(q40kbd_port->phys));

	serio_register_port(q40kbd_port);
	printk(KERN_INFO "serio: Q40 kbd registered\n");

	return 0;
}

static int __devexit q40kbd_remove(struct platform_device *dev)
{
	serio_unregister_port(q40kbd_port);

	return 0;
}

static struct platform_driver q40kbd_driver = {
	.driver		= {
		.name	= "q40kbd",
		.owner	= THIS_MODULE,
	},
	.probe		= q40kbd_probe,
	.remove		= __devexit_p(q40kbd_remove),
};

static int __init q40kbd_init(void)
{
	int error;

	if (!MACH_IS_Q40)
		return -ENODEV;

	error = platform_driver_register(&q40kbd_driver);
	if (error)
		return error;

	q40kbd_device = platform_device_alloc("q40kbd", -1);
	if (!q40kbd_device)
		goto err_unregister_driver;

	error = platform_device_add(q40kbd_device);
	if (error)
		goto err_free_device;

	return 0;

 err_free_device:
	platform_device_put(q40kbd_device);
 err_unregister_driver:
	platform_driver_unregister(&q40kbd_driver);
	return error;
}

static void __exit q40kbd_exit(void)
{
	platform_device_unregister(q40kbd_device);
	platform_driver_unregister(&q40kbd_driver);
}

module_init(q40kbd_init);
module_exit(q40kbd_exit);
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	2	* Copyright (c) 2000-2001 Vojtech Pavlik
	3	*
	4	* Based on the work of:
	5	* Richard Zidlicky <Richard.Zidlicky@stud.informatik.uni-erlangen.de>
	6	*/
	7
	8	/*
	9	* Q40 PS/2 keyboard controller driver for Linux/m68k
	10	*/
	11
	12	/*
	13	* This program is free software; you can redistribute it and/or modify
	14	* it under the terms of the GNU General Public License as published by
	15	* the Free Software Foundation; either version 2 of the License, or
	16	* (at your option) any later version.
	17	*
	18	* This program is distributed in the hope that it will be useful,
	19	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	20	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	21	* GNU General Public License for more details.
	22	*
	23	* You should have received a copy of the GNU General Public License
	24	* along with this program; if not, write to the Free Software
	25	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	26	*
	27	* Should you need to contact me, the author, you can do so either by
	28	* e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
	29	* Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
	30	*/
	31
	32	#include <linux/module.h>
	33	#include <linux/init.h>
	34	#include <linux/serio.h>
	35	#include <linux/interrupt.h>
	36	#include <linux/err.h>
	37	#include <linux/bitops.h>
d052d1be	38	#include <linux/platform_device.h>
1da177e4 LT	39
	40	#include <asm/io.h>
	41	#include <asm/uaccess.h>
	42	#include <asm/q40_master.h>
	43	#include <asm/irq.h>
	44	#include <asm/q40ints.h>
	45
	46	MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
	47	MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver");
	48	MODULE_LICENSE("GPL");
	49
4ad88901	50	static DEFINE_SPINLOCK(q40kbd_lock);
1da177e4 LT	51	static struct serio *q40kbd_port;
	52	static struct platform_device *q40kbd_device;
	53
7d12e780	54	static irqreturn_t q40kbd_interrupt(int irq, void *dev_id)
1da177e4 LT	55	{
	56	unsigned long flags;
	57
	58	spin_lock_irqsave(&q40kbd_lock, flags);
	59
	60	if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))
7d12e780	61	serio_interrupt(q40kbd_port, master_inb(KEYCODE_REG), 0);
1da177e4 LT	62
	63	master_outb(-1, KEYBOARD_UNLOCK_REG);
	64
	65	spin_unlock_irqrestore(&q40kbd_lock, flags);
	66
	67	return IRQ_HANDLED;
	68	}
	69
	70	/*
	71	* q40kbd_flush() flushes all data that may be in the keyboard buffers
	72	*/
	73
	74	static void q40kbd_flush(void)
	75	{
26421c7a	76	int maxread = 100;
1da177e4 LT	77	unsigned long flags;
	78
	79	spin_lock_irqsave(&q40kbd_lock, flags);
	80
26421c7a DT	81	while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)))
26421c7a DT	82	master_inb(KEYCODE_REG);
1da177e4 LT	83
	84	spin_unlock_irqrestore(&q40kbd_lock, flags);
	85	}
	86
	87	/*
	88	* q40kbd_open() is called when a port is open by the higher layer.
	89	* It allocates the interrupt and enables in in the chip.
	90	*/
	91
	92	static int q40kbd_open(struct serio *port)
	93	{
	94	q40kbd_flush();
	95
	96	if (request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0, "q40kbd", NULL)) {
	97	printk(KERN_ERR "q40kbd.c: Can't get irq %d.\n", Q40_IRQ_KEYBOARD);
26421c7a	98	return -EBUSY;
1da177e4 LT	99	}
1da177e4 LT	100
26421c7a DT	101	/* off we go */
	102	master_outb(-1, KEYBOARD_UNLOCK_REG);
	103	master_outb(1, KEY_IRQ_ENABLE_REG);
1da177e4	104
26421c7a	105	return 0;
1da177e4 LT	106	}
	107
	108	static void q40kbd_close(struct serio *port)
	109	{
	110	master_outb(0, KEY_IRQ_ENABLE_REG);
	111	master_outb(-1, KEYBOARD_UNLOCK_REG);
	112	free_irq(Q40_IRQ_KEYBOARD, NULL);
	113
	114	q40kbd_flush();
	115	}
	116
26421c7a	117	static int __devinit q40kbd_probe(struct platform_device *dev)
1da177e4	118	{
26421c7a DT	119	q40kbd_port = kzalloc(sizeof(struct serio), GFP_KERNEL);
	120	if (!q40kbd_port)
	121	return -ENOMEM;
	122
	123	q40kbd_port->id.type = SERIO_8042;
	124	q40kbd_port->open = q40kbd_open;
	125	q40kbd_port->close = q40kbd_close;
	126	q40kbd_port->dev.parent = &dev->dev;
	127	strlcpy(q40kbd_port->name, "Q40 Kbd Port", sizeof(q40kbd_port->name));
	128	strlcpy(q40kbd_port->phys, "Q40", sizeof(q40kbd_port->phys));
	129
	130	serio_register_port(q40kbd_port);
	131	printk(KERN_INFO "serio: Q40 kbd registered\n");
1da177e4	132
26421c7a	133	return 0;
1da177e4 LT	134	}
1da177e4 LT	135
26421c7a DT	136	static int __devexit q40kbd_remove(struct platform_device *dev)
	137	{
	138	serio_unregister_port(q40kbd_port);
	139
	140	return 0;
	141	}
	142
	143	static struct platform_driver q40kbd_driver = {
	144	.driver = {
	145	.name = "q40kbd",
	146	.owner = THIS_MODULE,
	147	},
	148	.probe = q40kbd_probe,
	149	.remove = __devexit_p(q40kbd_remove),
	150	};
	151
1da177e4 LT	152	static int __init q40kbd_init(void)
1da177e4 LT	153	{
26421c7a DT	154	int error;
26421c7a DT	155
1da177e4	156	if (!MACH_IS_Q40)
fd5b462f	157	return -ENODEV;
1da177e4	158
26421c7a DT	159	error = platform_driver_register(&q40kbd_driver);
	160	if (error)
	161	return error;
1da177e4	162
26421c7a DT	163	q40kbd_device = platform_device_alloc("q40kbd", -1);
	164	if (!q40kbd_device)
	165	goto err_unregister_driver;
1da177e4	166
26421c7a DT	167	error = platform_device_add(q40kbd_device);
	168	if (error)
	169	goto err_free_device;
1da177e4 LT	170
1da177e4 LT	171	return 0;
26421c7a DT	172
	173	err_free_device:
	174	platform_device_put(q40kbd_device);
	175	err_unregister_driver:
	176	platform_driver_unregister(&q40kbd_driver);
	177	return error;
1da177e4 LT	178	}
	179
	180	static void __exit q40kbd_exit(void)
	181	{
1da177e4	182	platform_device_unregister(q40kbd_device);
26421c7a	183	platform_driver_unregister(&q40kbd_driver);
1da177e4 LT	184	}
	185
	186	module_init(q40kbd_init);
	187	module_exit(q40kbd_exit);