1/* 2 * $Id: rpckbd.c,v 1.1.1.1 2007/08/03 18:52:34 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> 37#include <linux/platform_device.h> 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 45MODULE_AUTHOR("Vojtech Pavlik, Russell King"); 46MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver"); 47MODULE_LICENSE("GPL"); 48 49static 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 59static irqreturn_t rpckbd_rx(int irq, void *dev_id) 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 68 serio_interrupt(port, byte, 0); 69 handled = IRQ_HANDLED; 70 } 71 return handled; 72} 73 74static irqreturn_t rpckbd_tx(int irq, void *dev_id) 75{ 76 return IRQ_HANDLED; 77} 78 79static 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 100static 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 */ 110static int __devinit rpckbd_probe(struct platform_device *dev) 111{ 112 struct serio *serio; 113 114 serio = kzalloc(sizeof(struct serio), GFP_KERNEL); 115 if (!serio) 116 return -ENOMEM; 117 118 serio->id.type = SERIO_8042; 119 serio->write = rpckbd_write; 120 serio->open = rpckbd_open; 121 serio->close = rpckbd_close; 122 serio->dev.parent = &dev->dev; 123 strlcpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name)); 124 strlcpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys)); 125 126 platform_set_drvdata(dev, serio); 127 serio_register_port(serio); 128 return 0; 129} 130 131static int __devexit rpckbd_remove(struct platform_device *dev) 132{ 133 struct serio *serio = platform_get_drvdata(dev); 134 serio_unregister_port(serio); 135 return 0; 136} 137 138static struct platform_driver rpckbd_driver = { 139 .probe = rpckbd_probe, 140 .remove = __devexit_p(rpckbd_remove), 141 .driver = { 142 .name = "kart", 143 }, 144}; 145 146static int __init rpckbd_init(void) 147{ 148 return platform_driver_register(&rpckbd_driver); 149} 150 151static void __exit rpckbd_exit(void) 152{ 153 platform_driver_unregister(&rpckbd_driver); 154} 155 156module_init(rpckbd_init); 157module_exit(rpckbd_exit); 158