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 #include <linux/slab.h> 38 39 #include <asm/irq.h> 40 #include <mach/hardware.h> 41 #include <asm/hardware/iomd.h> 42 #include <asm/system.h> 43 44 MODULE_AUTHOR("Vojtech Pavlik, Russell King"); 45 MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver"); 46 MODULE_LICENSE("GPL"); 47 MODULE_ALIAS("platform:kart"); 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 59 static 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 74 static irqreturn_t rpckbd_tx(int irq, void *dev_id) 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, port); 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 */ 110 static 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 } 130 131 static 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 } 137 138 static struct platform_driver rpckbd_driver = { 139 .probe = rpckbd_probe, 140 .remove = __devexit_p(rpckbd_remove), 141 .driver = { 142 .name = "kart", 143 .owner = THIS_MODULE, 144 }, 145 }; 146 module_platform_driver(rpckbd_driver); 147