[mirror_ubuntu-bionic-kernel.git] / drivers / input / serio / rpckbd.c

/*
 *  Copyright (c) 2000-2001 Vojtech Pavlik
 *  Copyright (c) 2002 Russell King
 */

/*
 * Acorn RiscPC PS/2 keyboard controller driver for Linux/ARM
 */

/*
 * 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/interrupt.h>
#include <linux/serio.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/slab.h>

#include <mach/hardware.h>
#include <asm/hardware/iomd.h>

MODULE_AUTHOR("Vojtech Pavlik, Russell King");
MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:kart");

struct rpckbd_data {
	int tx_irq;
	int rx_irq;
};

static int rpckbd_write(struct serio *port, unsigned char val)
{
	while (!(iomd_readb(IOMD_KCTRL) & (1 << 7)))
		cpu_relax();

	iomd_writeb(val, IOMD_KARTTX);

	return 0;
}

static irqreturn_t rpckbd_rx(int irq, void *dev_id)
{
	struct serio *port = dev_id;
	unsigned int byte;
	int handled = IRQ_NONE;

	while (iomd_readb(IOMD_KCTRL) & (1 << 5)) {
		byte = iomd_readb(IOMD_KARTRX);

		serio_interrupt(port, byte, 0);
		handled = IRQ_HANDLED;
	}
	return handled;
}

static irqreturn_t rpckbd_tx(int irq, void *dev_id)
{
	return IRQ_HANDLED;
}

static int rpckbd_open(struct serio *port)
{
	struct rpckbd_data *rpckbd = port->port_data;

	/* Reset the keyboard state machine. */
	iomd_writeb(0, IOMD_KCTRL);
	iomd_writeb(8, IOMD_KCTRL);
	iomd_readb(IOMD_KARTRX);

	if (request_irq(rpckbd->rx_irq, rpckbd_rx, 0, "rpckbd", port) != 0) {
		printk(KERN_ERR "rpckbd.c: Could not allocate keyboard receive IRQ\n");
		return -EBUSY;
	}

	if (request_irq(rpckbd->tx_irq, rpckbd_tx, 0, "rpckbd", port) != 0) {
		printk(KERN_ERR "rpckbd.c: Could not allocate keyboard transmit IRQ\n");
		free_irq(rpckbd->rx_irq, port);
		return -EBUSY;
	}

	return 0;
}

static void rpckbd_close(struct serio *port)
{
	struct rpckbd_data *rpckbd = port->port_data;

	free_irq(rpckbd->rx_irq, port);
	free_irq(rpckbd->tx_irq, port);
}

/*
 * Allocate and initialize serio structure for subsequent registration
 * with serio core.
 */
static int rpckbd_probe(struct platform_device *dev)
{
	struct rpckbd_data *rpckbd;
	struct serio *serio;
	int tx_irq, rx_irq;

	rx_irq = platform_get_irq(dev, 0);
	if (rx_irq <= 0)
		return rx_irq < 0 ? rx_irq : -ENXIO;

	tx_irq = platform_get_irq(dev, 1);
	if (tx_irq <= 0)
		return tx_irq < 0 ? tx_irq : -ENXIO;

	serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
	rpckbd = kzalloc(sizeof(*rpckbd), GFP_KERNEL);
	if (!serio || !rpckbd) {
		kfree(rpckbd);
		kfree(serio);
		return -ENOMEM;
	}

	rpckbd->rx_irq = rx_irq;
	rpckbd->tx_irq = tx_irq;

	serio->id.type		= SERIO_8042;
	serio->write		= rpckbd_write;
	serio->open		= rpckbd_open;
	serio->close		= rpckbd_close;
	serio->dev.parent	= &dev->dev;
	serio->port_data	= rpckbd;
	strlcpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name));
	strlcpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys));

	platform_set_drvdata(dev, serio);
	serio_register_port(serio);
	return 0;
}

static int rpckbd_remove(struct platform_device *dev)
{
	struct serio *serio = platform_get_drvdata(dev);
	struct rpckbd_data *rpckbd = serio->port_data;

	serio_unregister_port(serio);
	kfree(rpckbd);

	return 0;
}

static struct platform_driver rpckbd_driver = {
	.probe		= rpckbd_probe,
	.remove		= rpckbd_remove,
	.driver		= {
		.name	= "kart",
	},
};
module_platform_driver(rpckbd_driver);
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	2	* Copyright (c) 2000-2001 Vojtech Pavlik
	3	* Copyright (c) 2002 Russell King
	4	*/
	5
	6	/*
	7	* Acorn RiscPC PS/2 keyboard controller driver for Linux/ARM
	8	*/
	9
	10	/*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2 of the License, or
	14	* (at your option) any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; if not, write to the Free Software
	23	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	24	*
	25	* Should you need to contact me, the author, you can do so either by
	26	* e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
	27	* Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
	28	*/
	29
	30	#include <linux/module.h>
	31	#include <linux/interrupt.h>
1da177e4 LT	32	#include <linux/serio.h>
1da177e4 LT	33	#include <linux/err.h>
d052d1be	34	#include <linux/platform_device.h>
99730225	35	#include <linux/io.h>
5a0e3ad6	36	#include <linux/slab.h>
1da177e4	37
a09e64fb	38	#include <mach/hardware.h>
1da177e4	39	#include <asm/hardware/iomd.h>
1da177e4 LT	40
	41	MODULE_AUTHOR("Vojtech Pavlik, Russell King");
	42	MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver");
	43	MODULE_LICENSE("GPL");
d7b5247b	44	MODULE_ALIAS("platform:kart");
1da177e4	45
8c6d9d0a RK	46	struct rpckbd_data {
	47	int tx_irq;
	48	int rx_irq;
	49	};
	50
1da177e4 LT	51	static int rpckbd_write(struct serio *port, unsigned char val)
	52	{
	53	while (!(iomd_readb(IOMD_KCTRL) & (1 << 7)))
	54	cpu_relax();
	55
	56	iomd_writeb(val, IOMD_KARTTX);
	57
	58	return 0;
	59	}
	60
7d12e780	61	static irqreturn_t rpckbd_rx(int irq, void *dev_id)
1da177e4 LT	62	{
	63	struct serio *port = dev_id;
	64	unsigned int byte;
	65	int handled = IRQ_NONE;
	66
	67	while (iomd_readb(IOMD_KCTRL) & (1 << 5)) {
	68	byte = iomd_readb(IOMD_KARTRX);
	69
7d12e780	70	serio_interrupt(port, byte, 0);
1da177e4 LT	71	handled = IRQ_HANDLED;
	72	}
	73	return handled;
	74	}
	75
7d12e780	76	static irqreturn_t rpckbd_tx(int irq, void *dev_id)
1da177e4 LT	77	{
	78	return IRQ_HANDLED;
	79	}
	80
	81	static int rpckbd_open(struct serio *port)
	82	{
8c6d9d0a RK	83	struct rpckbd_data *rpckbd = port->port_data;
8c6d9d0a RK	84
1da177e4 LT	85	/* Reset the keyboard state machine. */
	86	iomd_writeb(0, IOMD_KCTRL);
	87	iomd_writeb(8, IOMD_KCTRL);
	88	iomd_readb(IOMD_KARTRX);
	89
8c6d9d0a	90	if (request_irq(rpckbd->rx_irq, rpckbd_rx, 0, "rpckbd", port) != 0) {
1da177e4 LT	91	printk(KERN_ERR "rpckbd.c: Could not allocate keyboard receive IRQ\n");
	92	return -EBUSY;
	93	}
	94
8c6d9d0a	95	if (request_irq(rpckbd->tx_irq, rpckbd_tx, 0, "rpckbd", port) != 0) {
1da177e4	96	printk(KERN_ERR "rpckbd.c: Could not allocate keyboard transmit IRQ\n");
8c6d9d0a	97	free_irq(rpckbd->rx_irq, port);
1da177e4 LT	98	return -EBUSY;
	99	}
	100
	101	return 0;
	102	}
	103
	104	static void rpckbd_close(struct serio *port)
	105	{
8c6d9d0a RK	106	struct rpckbd_data *rpckbd = port->port_data;
	107
	108	free_irq(rpckbd->rx_irq, port);
	109	free_irq(rpckbd->tx_irq, port);
1da177e4 LT	110	}
	111
	112	/*
	113	* Allocate and initialize serio structure for subsequent registration
	114	* with serio core.
	115	*/
5298cc4c	116	static int rpckbd_probe(struct platform_device *dev)
1da177e4	117	{
8c6d9d0a	118	struct rpckbd_data *rpckbd;
1da177e4	119	struct serio *serio;
8c6d9d0a RK	120	int tx_irq, rx_irq;
	121
	122	rx_irq = platform_get_irq(dev, 0);
	123	if (rx_irq <= 0)
	124	return rx_irq < 0 ? rx_irq : -ENXIO;
	125
	126	tx_irq = platform_get_irq(dev, 1);
	127	if (tx_irq <= 0)
	128	return tx_irq < 0 ? tx_irq : -ENXIO;
1da177e4	129
b39787a9	130	serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
8c6d9d0a RK	131	rpckbd = kzalloc(sizeof(*rpckbd), GFP_KERNEL);
	132	if (!serio \|\| !rpckbd) {
	133	kfree(rpckbd);
	134	kfree(serio);
1da177e4	135	return -ENOMEM;
8c6d9d0a RK	136	}
	137
	138	rpckbd->rx_irq = rx_irq;
	139	rpckbd->tx_irq = tx_irq;
1da177e4	140
1da177e4 LT	141	serio->id.type = SERIO_8042;
	142	serio->write = rpckbd_write;
	143	serio->open = rpckbd_open;
	144	serio->close = rpckbd_close;
3ae5eaec	145	serio->dev.parent = &dev->dev;
8c6d9d0a	146	serio->port_data = rpckbd;
1da177e4 LT	147	strlcpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name));
	148	strlcpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys));
	149
3ae5eaec	150	platform_set_drvdata(dev, serio);
1da177e4 LT	151	serio_register_port(serio);
	152	return 0;
	153	}
	154
e2619cf7	155	static int rpckbd_remove(struct platform_device *dev)
1da177e4	156	{
3ae5eaec	157	struct serio *serio = platform_get_drvdata(dev);
8c6d9d0a RK	158	struct rpckbd_data *rpckbd = serio->port_data;
8c6d9d0a RK	159
1da177e4	160	serio_unregister_port(serio);
8c6d9d0a RK	161	kfree(rpckbd);
8c6d9d0a RK	162
1da177e4 LT	163	return 0;
	164	}
	165
3ae5eaec	166	static struct platform_driver rpckbd_driver = {
1da177e4	167	.probe = rpckbd_probe,
1cb0aa88	168	.remove = rpckbd_remove,
3ae5eaec RK	169	.driver = {
	170	.name = "kart",
	171	},
1da177e4	172	};
24d2469a	173	module_platform_driver(rpckbd_driver);