2 * Copyright (c) 2000-2001 Vojtech Pavlik
3 * Copyright (c) 2002 Russell King
7 * Acorn RiscPC PS/2 keyboard controller driver for Linux/ARM
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.
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.
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
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
30 #include <linux/module.h>
31 #include <linux/interrupt.h>
32 #include <linux/serio.h>
33 #include <linux/err.h>
34 #include <linux/platform_device.h>
36 #include <linux/slab.h>
38 #include <mach/hardware.h>
39 #include <asm/hardware/iomd.h>
41 MODULE_AUTHOR("Vojtech Pavlik, Russell King");
42 MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver");
43 MODULE_LICENSE("GPL");
44 MODULE_ALIAS("platform:kart");
51 static int rpckbd_write(struct serio *port, unsigned char val)
53 while (!(iomd_readb(IOMD_KCTRL) & (1 << 7)))
56 iomd_writeb(val, IOMD_KARTTX);
61 static irqreturn_t rpckbd_rx(int irq, void *dev_id)
63 struct serio *port = dev_id;
65 int handled = IRQ_NONE;
67 while (iomd_readb(IOMD_KCTRL) & (1 << 5)) {
68 byte = iomd_readb(IOMD_KARTRX);
70 serio_interrupt(port, byte, 0);
71 handled = IRQ_HANDLED;
76 static irqreturn_t rpckbd_tx(int irq, void *dev_id)
81 static int rpckbd_open(struct serio *port)
83 struct rpckbd_data *rpckbd = port->port_data;
85 /* Reset the keyboard state machine. */
86 iomd_writeb(0, IOMD_KCTRL);
87 iomd_writeb(8, IOMD_KCTRL);
88 iomd_readb(IOMD_KARTRX);
90 if (request_irq(rpckbd->rx_irq, rpckbd_rx, 0, "rpckbd", port) != 0) {
91 printk(KERN_ERR "rpckbd.c: Could not allocate keyboard receive IRQ\n");
95 if (request_irq(rpckbd->tx_irq, rpckbd_tx, 0, "rpckbd", port) != 0) {
96 printk(KERN_ERR "rpckbd.c: Could not allocate keyboard transmit IRQ\n");
97 free_irq(rpckbd->rx_irq, port);
104 static void rpckbd_close(struct serio *port)
106 struct rpckbd_data *rpckbd = port->port_data;
108 free_irq(rpckbd->rx_irq, port);
109 free_irq(rpckbd->tx_irq, port);
113 * Allocate and initialize serio structure for subsequent registration
116 static int rpckbd_probe(struct platform_device *dev)
118 struct rpckbd_data *rpckbd;
122 rx_irq = platform_get_irq(dev, 0);
124 return rx_irq < 0 ? rx_irq : -ENXIO;
126 tx_irq = platform_get_irq(dev, 1);
128 return tx_irq < 0 ? tx_irq : -ENXIO;
130 serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
131 rpckbd = kzalloc(sizeof(*rpckbd), GFP_KERNEL);
132 if (!serio || !rpckbd) {
138 rpckbd->rx_irq = rx_irq;
139 rpckbd->tx_irq = tx_irq;
141 serio->id.type = SERIO_8042;
142 serio->write = rpckbd_write;
143 serio->open = rpckbd_open;
144 serio->close = rpckbd_close;
145 serio->dev.parent = &dev->dev;
146 serio->port_data = rpckbd;
147 strlcpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name));
148 strlcpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys));
150 platform_set_drvdata(dev, serio);
151 serio_register_port(serio);
155 static int rpckbd_remove(struct platform_device *dev)
157 struct serio *serio = platform_get_drvdata(dev);
158 struct rpckbd_data *rpckbd = serio->port_data;
160 serio_unregister_port(serio);
166 static struct platform_driver rpckbd_driver = {
167 .probe = rpckbd_probe,
168 .remove = rpckbd_remove,
173 module_platform_driver(rpckbd_driver);