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

Warning: That file was not part of the compilation database. It may have many parsing errors.