1/*
  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>
 32#include <linux/init.h>
 33#include <linux/serio.h>
 34#include <linux/err.h>
 35#include <linux/platform_device.h>
 36#include <linux/io.h>
 37#include <linux/slab.h>
 38
 39#include <mach/hardware.h>
 40#include <asm/hardware/iomd.h>
 41
 42MODULE_AUTHOR("Vojtech Pavlik, Russell King");
 43MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver");
 44MODULE_LICENSE("GPL");
 45MODULE_ALIAS("platform:kart");
 46
 47struct rpckbd_data {
 48	int tx_irq;
 49	int rx_irq;
 50};
 51
 52static int rpckbd_write(struct serio *port, unsigned char val)
 53{
 54	while (!(iomd_readb(IOMD_KCTRL) & (1 << 7)))
 55		cpu_relax();
 56
 57	iomd_writeb(val, IOMD_KARTTX);
 58
 59	return 0;
 60}
 61
 62static irqreturn_t rpckbd_rx(int irq, void *dev_id)
 63{
 64	struct serio *port = dev_id;
 65	unsigned int byte;
 66	int handled = IRQ_NONE;
 67
 68	while (iomd_readb(IOMD_KCTRL) & (1 << 5)) {
 69		byte = iomd_readb(IOMD_KARTRX);
 70
 71		serio_interrupt(port, byte, 0);
 72		handled = IRQ_HANDLED;
 73	}
 74	return handled;
 75}
 76
 77static irqreturn_t rpckbd_tx(int irq, void *dev_id)
 78{
 79	return IRQ_HANDLED;
 80}
 81
 82static int rpckbd_open(struct serio *port)
 83{
 84	struct rpckbd_data *rpckbd = port->port_data;
 85
 86	/* Reset the keyboard state machine. */
 87	iomd_writeb(0, IOMD_KCTRL);
 88	iomd_writeb(8, IOMD_KCTRL);
 89	iomd_readb(IOMD_KARTRX);
 90
 91	if (request_irq(rpckbd->rx_irq, rpckbd_rx, 0, "rpckbd", port) != 0) {
 92		printk(KERN_ERR "rpckbd.c: Could not allocate keyboard receive IRQ\n");
 93		return -EBUSY;
 94	}
 95
 96	if (request_irq(rpckbd->tx_irq, rpckbd_tx, 0, "rpckbd", port) != 0) {
 97		printk(KERN_ERR "rpckbd.c: Could not allocate keyboard transmit IRQ\n");
 98		free_irq(rpckbd->rx_irq, port);
 99		return -EBUSY;
100	}
101
102	return 0;
103}
104
105static void rpckbd_close(struct serio *port)
106{
107	struct rpckbd_data *rpckbd = port->port_data;
108
109	free_irq(rpckbd->rx_irq, port);
110	free_irq(rpckbd->tx_irq, port);
111}
112
113/*
114 * Allocate and initialize serio structure for subsequent registration
115 * with serio core.
116 */
117static int __devinit rpckbd_probe(struct platform_device *dev)
118{
119	struct rpckbd_data *rpckbd;
120	struct serio *serio;
121	int tx_irq, rx_irq;
122
123	rx_irq = platform_get_irq(dev, 0);
124	if (rx_irq <= 0)
125		return rx_irq < 0 ? rx_irq : -ENXIO;
126
127	tx_irq = platform_get_irq(dev, 1);
128	if (tx_irq <= 0)
129		return tx_irq < 0 ? tx_irq : -ENXIO;
130
131	serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
132	rpckbd = kzalloc(sizeof(*rpckbd), GFP_KERNEL);
133	if (!serio || !rpckbd) {
134		kfree(rpckbd);
135		kfree(serio);
136		return -ENOMEM;
137	}
138
139	rpckbd->rx_irq = rx_irq;
140	rpckbd->tx_irq = tx_irq;
141
142	serio->id.type		= SERIO_8042;
143	serio->write		= rpckbd_write;
144	serio->open		= rpckbd_open;
145	serio->close		= rpckbd_close;
146	serio->dev.parent	= &dev->dev;
147	serio->port_data	= rpckbd;
148	strlcpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name));
149	strlcpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys));
150
151	platform_set_drvdata(dev, serio);
152	serio_register_port(serio);
153	return 0;
154}
155
156static int __devexit rpckbd_remove(struct platform_device *dev)
157{
158	struct serio *serio = platform_get_drvdata(dev);
159	struct rpckbd_data *rpckbd = serio->port_data;
160
161	serio_unregister_port(serio);
162	kfree(rpckbd);
163
164	return 0;
165}
166
167static struct platform_driver rpckbd_driver = {
168	.probe		= rpckbd_probe,
169	.remove		= __devexit_p(rpckbd_remove),
170	.driver		= {
171		.name	= "kart",
172		.owner	= THIS_MODULE,
173	},
174};
175module_platform_driver(rpckbd_driver);