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1da177e4 LT |
1 | /* |
2 | * $Id: rpckbd.c,v 1.7 2001/09/25 10:12:07 vojtech Exp $ | |
3 | * | |
4 | * Copyright (c) 2000-2001 Vojtech Pavlik | |
5 | * Copyright (c) 2002 Russell King | |
6 | */ | |
7 | ||
8 | /* | |
9 | * Acorn RiscPC PS/2 keyboard controller driver for Linux/ARM | |
10 | */ | |
11 | ||
12 | /* | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2 of the License, or | |
16 | * (at your option) any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | * GNU General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License | |
24 | * along with this program; if not, write to the Free Software | |
25 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
26 | * | |
27 | * Should you need to contact me, the author, you can do so either by | |
28 | * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail: | |
29 | * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic | |
30 | */ | |
31 | ||
32 | #include <linux/module.h> | |
33 | #include <linux/interrupt.h> | |
34 | #include <linux/init.h> | |
35 | #include <linux/serio.h> | |
36 | #include <linux/err.h> | |
d052d1be | 37 | #include <linux/platform_device.h> |
1da177e4 LT |
38 | |
39 | #include <asm/irq.h> | |
40 | #include <asm/hardware.h> | |
41 | #include <asm/io.h> | |
42 | #include <asm/hardware/iomd.h> | |
43 | #include <asm/system.h> | |
44 | ||
45 | MODULE_AUTHOR("Vojtech Pavlik, Russell King"); | |
46 | MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver"); | |
47 | MODULE_LICENSE("GPL"); | |
48 | ||
49 | static int rpckbd_write(struct serio *port, unsigned char val) | |
50 | { | |
51 | while (!(iomd_readb(IOMD_KCTRL) & (1 << 7))) | |
52 | cpu_relax(); | |
53 | ||
54 | iomd_writeb(val, IOMD_KARTTX); | |
55 | ||
56 | return 0; | |
57 | } | |
58 | ||
7d12e780 | 59 | static irqreturn_t rpckbd_rx(int irq, void *dev_id) |
1da177e4 LT |
60 | { |
61 | struct serio *port = dev_id; | |
62 | unsigned int byte; | |
63 | int handled = IRQ_NONE; | |
64 | ||
65 | while (iomd_readb(IOMD_KCTRL) & (1 << 5)) { | |
66 | byte = iomd_readb(IOMD_KARTRX); | |
67 | ||
7d12e780 | 68 | serio_interrupt(port, byte, 0); |
1da177e4 LT |
69 | handled = IRQ_HANDLED; |
70 | } | |
71 | return handled; | |
72 | } | |
73 | ||
7d12e780 | 74 | static irqreturn_t rpckbd_tx(int irq, void *dev_id) |
1da177e4 LT |
75 | { |
76 | return IRQ_HANDLED; | |
77 | } | |
78 | ||
79 | static int rpckbd_open(struct serio *port) | |
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(IRQ_KEYBOARDRX, 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(IRQ_KEYBOARDTX, rpckbd_tx, 0, "rpckbd", port) != 0) { | |
92 | printk(KERN_ERR "rpckbd.c: Could not allocate keyboard transmit IRQ\n"); | |
93 | free_irq(IRQ_KEYBOARDRX, NULL); | |
94 | return -EBUSY; | |
95 | } | |
96 | ||
97 | return 0; | |
98 | } | |
99 | ||
100 | static void rpckbd_close(struct serio *port) | |
101 | { | |
102 | free_irq(IRQ_KEYBOARDRX, port); | |
103 | free_irq(IRQ_KEYBOARDTX, port); | |
104 | } | |
105 | ||
106 | /* | |
107 | * Allocate and initialize serio structure for subsequent registration | |
108 | * with serio core. | |
109 | */ | |
3ae5eaec | 110 | static int __devinit rpckbd_probe(struct platform_device *dev) |
1da177e4 LT |
111 | { |
112 | struct serio *serio; | |
113 | ||
b39787a9 | 114 | serio = kzalloc(sizeof(struct serio), GFP_KERNEL); |
1da177e4 LT |
115 | if (!serio) |
116 | return -ENOMEM; | |
117 | ||
1da177e4 LT |
118 | serio->id.type = SERIO_8042; |
119 | serio->write = rpckbd_write; | |
120 | serio->open = rpckbd_open; | |
121 | serio->close = rpckbd_close; | |
3ae5eaec | 122 | serio->dev.parent = &dev->dev; |
1da177e4 LT |
123 | strlcpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name)); |
124 | strlcpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys)); | |
125 | ||
3ae5eaec | 126 | platform_set_drvdata(dev, serio); |
1da177e4 LT |
127 | serio_register_port(serio); |
128 | return 0; | |
129 | } | |
130 | ||
3ae5eaec | 131 | static int __devexit rpckbd_remove(struct platform_device *dev) |
1da177e4 | 132 | { |
3ae5eaec | 133 | struct serio *serio = platform_get_drvdata(dev); |
1da177e4 LT |
134 | serio_unregister_port(serio); |
135 | return 0; | |
136 | } | |
137 | ||
3ae5eaec | 138 | static struct platform_driver rpckbd_driver = { |
1da177e4 LT |
139 | .probe = rpckbd_probe, |
140 | .remove = __devexit_p(rpckbd_remove), | |
3ae5eaec RK |
141 | .driver = { |
142 | .name = "kart", | |
143 | }, | |
1da177e4 LT |
144 | }; |
145 | ||
146 | static int __init rpckbd_init(void) | |
147 | { | |
3ae5eaec | 148 | return platform_driver_register(&rpckbd_driver); |
1da177e4 LT |
149 | } |
150 | ||
151 | static void __exit rpckbd_exit(void) | |
152 | { | |
3ae5eaec | 153 | platform_driver_unregister(&rpckbd_driver); |
1da177e4 LT |
154 | } |
155 | ||
156 | module_init(rpckbd_init); | |
157 | module_exit(rpckbd_exit); |