[linux-2.6-block.git] / drivers / input / serio / q40kbd.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  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
 */

/*
 */

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

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

#define DRV_NAME	"q40kbd"

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

struct q40kbd {
	struct serio *port;
	spinlock_t lock;
};

static irqreturn_t q40kbd_interrupt(int irq, void *dev_id)
{
	struct q40kbd *q40kbd = 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(struct q40kbd *q40kbd)
{
	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);
}

static void q40kbd_stop(void)
{
	master_outb(0, KEY_IRQ_ENABLE_REG);
	master_outb(-1, KEYBOARD_UNLOCK_REG);
}

/*
 * 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)
{
	struct q40kbd *q40kbd = port->port_data;

	q40kbd_flush(q40kbd);

	/* 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)
{
	struct q40kbd *q40kbd = port->port_data;

	q40kbd_stop();
	q40kbd_flush(q40kbd);
}

static int q40kbd_probe(struct platform_device *pdev)
{
	struct q40kbd *q40kbd;
	struct serio *port;
	int error;

	q40kbd = kzalloc(sizeof(struct q40kbd), GFP_KERNEL);
	port = kzalloc(sizeof(struct serio), GFP_KERNEL);
	if (!q40kbd || !port) {
		error = -ENOMEM;
		goto err_free_mem;
	}

	q40kbd->port = port;
	spin_lock_init(&q40kbd->lock);

	port->id.type = SERIO_8042;
	port->open = q40kbd_open;
	port->close = q40kbd_close;
	port->port_data = q40kbd;
	port->dev.parent = &pdev->dev;
	strlcpy(port->name, "Q40 Kbd Port", sizeof(port->name));
	strlcpy(port->phys, "Q40", sizeof(port->phys));

	q40kbd_stop();

	error = request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0,
			    DRV_NAME, q40kbd);
	if (error) {
		dev_err(&pdev->dev, "Can't get irq %d.\n", Q40_IRQ_KEYBOARD);
		goto err_free_mem;
	}

	serio_register_port(q40kbd->port);

	platform_set_drvdata(pdev, q40kbd);
	printk(KERN_INFO "serio: Q40 kbd registered\n");

	return 0;

err_free_mem:
	kfree(port);
	kfree(q40kbd);
	return error;
}

static int q40kbd_remove(struct platform_device *pdev)
{
	struct q40kbd *q40kbd = platform_get_drvdata(pdev);

	/*
	 * q40kbd_close() will be called as part of unregistering
	 * and will ensure that IRQ is turned off, so it is safe
	 * to unregister port first and free IRQ later.
	 */
	serio_unregister_port(q40kbd->port);
	free_irq(Q40_IRQ_KEYBOARD, q40kbd);
	kfree(q40kbd);

	return 0;
}

static struct platform_driver q40kbd_driver = {
	.driver		= {
		.name	= "q40kbd",
	},
	.remove		= q40kbd_remove,
};

module_platform_driver_probe(q40kbd_driver, q40kbd_probe);
Commit	Line	Data
1a59d1b8	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4	2	/*
1da177e4 LT	3	* Copyright (c) 2000-2001 Vojtech Pavlik
	4	*
	5	* Based on the work of:
	6	* Richard Zidlicky <Richard.Zidlicky@stud.informatik.uni-erlangen.de>
	7	*/
	8
	9	/*
	10	* Q40 PS/2 keyboard controller driver for Linux/m68k
	11	*/
	12
	13	/*
1da177e4 LT	14	*/
	15
	16	#include <linux/module.h>
1da177e4 LT	17	#include <linux/serio.h>
	18	#include <linux/interrupt.h>
	19	#include <linux/err.h>
	20	#include <linux/bitops.h>
d052d1be	21	#include <linux/platform_device.h>
5a0e3ad6	22	#include <linux/slab.h>
1da177e4 LT	23
1da177e4 LT	24	#include <asm/io.h>
7c0f6ba6	25	#include <linux/uaccess.h>
1da177e4 LT	26	#include <asm/q40_master.h>
	27	#include <asm/irq.h>
	28	#include <asm/q40ints.h>
	29
409e1544 DT	30	#define DRV_NAME "q40kbd"
409e1544 DT	31
1da177e4 LT	32	MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
	33	MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver");
	34	MODULE_LICENSE("GPL");
409e1544	35	MODULE_ALIAS("platform:" DRV_NAME);
1da177e4	36
409e1544 DT	37	struct q40kbd {
	38	struct serio *port;
	39	spinlock_t lock;
	40	};
1da177e4	41
7d12e780	42	static irqreturn_t q40kbd_interrupt(int irq, void *dev_id)
1da177e4	43	{
409e1544	44	struct q40kbd *q40kbd = dev_id;
1da177e4 LT	45	unsigned long flags;
1da177e4 LT	46
409e1544	47	spin_lock_irqsave(&q40kbd->lock, flags);
1da177e4 LT	48
1da177e4 LT	49	if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))
409e1544	50	serio_interrupt(q40kbd->port, master_inb(KEYCODE_REG), 0);
1da177e4 LT	51
	52	master_outb(-1, KEYBOARD_UNLOCK_REG);
	53
409e1544	54	spin_unlock_irqrestore(&q40kbd->lock, flags);
1da177e4 LT	55
	56	return IRQ_HANDLED;
	57	}
	58
	59	/*
	60	* q40kbd_flush() flushes all data that may be in the keyboard buffers
	61	*/
	62
409e1544	63	static void q40kbd_flush(struct q40kbd *q40kbd)
1da177e4	64	{
26421c7a	65	int maxread = 100;
1da177e4 LT	66	unsigned long flags;
1da177e4 LT	67
409e1544	68	spin_lock_irqsave(&q40kbd->lock, flags);
1da177e4	69
26421c7a DT	70	while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)))
26421c7a DT	71	master_inb(KEYCODE_REG);
1da177e4	72
409e1544 DT	73	spin_unlock_irqrestore(&q40kbd->lock, flags);
	74	}
	75
	76	static void q40kbd_stop(void)
	77	{
	78	master_outb(0, KEY_IRQ_ENABLE_REG);
	79	master_outb(-1, KEYBOARD_UNLOCK_REG);
1da177e4 LT	80	}
	81
	82	/*
	83	* q40kbd_open() is called when a port is open by the higher layer.
	84	* It allocates the interrupt and enables in in the chip.
	85	*/
	86
	87	static int q40kbd_open(struct serio *port)
	88	{
409e1544	89	struct q40kbd *q40kbd = port->port_data;
1da177e4	90
409e1544	91	q40kbd_flush(q40kbd);
1da177e4	92
26421c7a DT	93	/* off we go */
	94	master_outb(-1, KEYBOARD_UNLOCK_REG);
	95	master_outb(1, KEY_IRQ_ENABLE_REG);
1da177e4	96
26421c7a	97	return 0;
1da177e4 LT	98	}
	99
	100	static void q40kbd_close(struct serio *port)
	101	{
409e1544	102	struct q40kbd *q40kbd = port->port_data;
1da177e4	103
409e1544 DT	104	q40kbd_stop();
409e1544 DT	105	q40kbd_flush(q40kbd);
1da177e4 LT	106	}
1da177e4 LT	107
5298cc4c	108	static int q40kbd_probe(struct platform_device *pdev)
1da177e4	109	{
409e1544 DT	110	struct q40kbd *q40kbd;
	111	struct serio *port;
	112	int error;
	113
	114	q40kbd = kzalloc(sizeof(struct q40kbd), GFP_KERNEL);
	115	port = kzalloc(sizeof(struct serio), GFP_KERNEL);
	116	if (!q40kbd \|\| !port) {
	117	error = -ENOMEM;
	118	goto err_free_mem;
	119	}
	120
	121	q40kbd->port = port;
	122	spin_lock_init(&q40kbd->lock);
	123
	124	port->id.type = SERIO_8042;
	125	port->open = q40kbd_open;
	126	port->close = q40kbd_close;
	127	port->port_data = q40kbd;
	128	port->dev.parent = &pdev->dev;
	129	strlcpy(port->name, "Q40 Kbd Port", sizeof(port->name));
	130	strlcpy(port->phys, "Q40", sizeof(port->phys));
	131
	132	q40kbd_stop();
	133
	134	error = request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0,
	135	DRV_NAME, q40kbd);
	136	if (error) {
	137	dev_err(&pdev->dev, "Can't get irq %d.\n", Q40_IRQ_KEYBOARD);
	138	goto err_free_mem;
	139	}
	140
	141	serio_register_port(q40kbd->port);
	142
	143	platform_set_drvdata(pdev, q40kbd);
26421c7a	144	printk(KERN_INFO "serio: Q40 kbd registered\n");
1da177e4	145
26421c7a	146	return 0;
409e1544 DT	147
	148	err_free_mem:
	149	kfree(port);
	150	kfree(q40kbd);
	151	return error;
1da177e4 LT	152	}
1da177e4 LT	153
e2619cf7	154	static int q40kbd_remove(struct platform_device *pdev)
26421c7a	155	{
409e1544 DT	156	struct q40kbd *q40kbd = platform_get_drvdata(pdev);
	157
	158	/*
	159	* q40kbd_close() will be called as part of unregistering
	160	* and will ensure that IRQ is turned off, so it is safe
	161	* to unregister port first and free IRQ later.
	162	*/
	163	serio_unregister_port(q40kbd->port);
	164	free_irq(Q40_IRQ_KEYBOARD, q40kbd);
	165	kfree(q40kbd);
	166
26421c7a DT	167	return 0;
	168	}
	169
	170	static struct platform_driver q40kbd_driver = {
	171	.driver = {
	172	.name = "q40kbd",
26421c7a	173	},
1cb0aa88	174	.remove = q40kbd_remove,
26421c7a DT	175	};
26421c7a DT	176
07beda4f	177	module_platform_driver_probe(q40kbd_driver, q40kbd_probe);