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