Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Russell King | d052d1b | 2005-10-29 19:07:23 +0100 | [diff] [blame] | 37 | #include <linux/platform_device.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 59 | static irqreturn_t rpckbd_rx(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 68 | serio_interrupt(port, byte, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | handled = IRQ_HANDLED; |
| 70 | } |
| 71 | return handled; |
| 72 | } |
| 73 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 74 | static irqreturn_t rpckbd_tx(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 110 | static int __devinit rpckbd_probe(struct platform_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | { |
| 112 | struct serio *serio; |
| 113 | |
Eric Sesterhenn | b39787a | 2006-03-14 00:09:16 -0500 | [diff] [blame] | 114 | serio = kzalloc(sizeof(struct serio), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | if (!serio) |
| 116 | return -ENOMEM; |
| 117 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | serio->id.type = SERIO_8042; |
| 119 | serio->write = rpckbd_write; |
| 120 | serio->open = rpckbd_open; |
| 121 | serio->close = rpckbd_close; |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 122 | serio->dev.parent = &dev->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | strlcpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name)); |
| 124 | strlcpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys)); |
| 125 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 126 | platform_set_drvdata(dev, serio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | serio_register_port(serio); |
| 128 | return 0; |
| 129 | } |
| 130 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 131 | static int __devexit rpckbd_remove(struct platform_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | { |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 133 | struct serio *serio = platform_get_drvdata(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | serio_unregister_port(serio); |
| 135 | return 0; |
| 136 | } |
| 137 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 138 | static struct platform_driver rpckbd_driver = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | .probe = rpckbd_probe, |
| 140 | .remove = __devexit_p(rpckbd_remove), |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 141 | .driver = { |
| 142 | .name = "kart", |
| 143 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | }; |
| 145 | |
| 146 | static int __init rpckbd_init(void) |
| 147 | { |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 148 | return platform_driver_register(&rpckbd_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | } |
| 150 | |
| 151 | static void __exit rpckbd_exit(void) |
| 152 | { |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 153 | platform_driver_unregister(&rpckbd_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | } |
| 155 | |
| 156 | module_init(rpckbd_init); |
| 157 | module_exit(rpckbd_exit); |