157 lines
3.9 KiB
C
157 lines
3.9 KiB
C
/*
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* Copyright (c) 2000-2001 Vojtech Pavlik
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* Copyright (c) 2002 Russell King
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*/
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/*
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* Acorn RiscPC PS/2 keyboard controller driver for Linux/ARM
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*/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Should you need to contact me, the author, you can do so either by
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* e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
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* Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
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*/
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/serio.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <asm/irq.h>
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#include <mach/hardware.h>
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#include <asm/hardware/iomd.h>
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#include <asm/system.h>
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MODULE_AUTHOR("Vojtech Pavlik, Russell King");
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MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:kart");
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static int rpckbd_write(struct serio *port, unsigned char val)
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{
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while (!(iomd_readb(IOMD_KCTRL) & (1 << 7)))
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cpu_relax();
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iomd_writeb(val, IOMD_KARTTX);
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return 0;
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}
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static irqreturn_t rpckbd_rx(int irq, void *dev_id)
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{
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struct serio *port = dev_id;
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unsigned int byte;
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int handled = IRQ_NONE;
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while (iomd_readb(IOMD_KCTRL) & (1 << 5)) {
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byte = iomd_readb(IOMD_KARTRX);
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serio_interrupt(port, byte, 0);
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handled = IRQ_HANDLED;
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}
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return handled;
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}
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static irqreturn_t rpckbd_tx(int irq, void *dev_id)
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{
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return IRQ_HANDLED;
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}
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static int rpckbd_open(struct serio *port)
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{
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/* Reset the keyboard state machine. */
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iomd_writeb(0, IOMD_KCTRL);
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iomd_writeb(8, IOMD_KCTRL);
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iomd_readb(IOMD_KARTRX);
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if (request_irq(IRQ_KEYBOARDRX, rpckbd_rx, 0, "rpckbd", port) != 0) {
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printk(KERN_ERR "rpckbd.c: Could not allocate keyboard receive IRQ\n");
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return -EBUSY;
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}
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if (request_irq(IRQ_KEYBOARDTX, rpckbd_tx, 0, "rpckbd", port) != 0) {
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printk(KERN_ERR "rpckbd.c: Could not allocate keyboard transmit IRQ\n");
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free_irq(IRQ_KEYBOARDRX, NULL);
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return -EBUSY;
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}
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return 0;
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}
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static void rpckbd_close(struct serio *port)
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{
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free_irq(IRQ_KEYBOARDRX, port);
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free_irq(IRQ_KEYBOARDTX, port);
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}
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/*
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* Allocate and initialize serio structure for subsequent registration
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* with serio core.
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*/
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static int __devinit rpckbd_probe(struct platform_device *dev)
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{
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struct serio *serio;
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serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
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if (!serio)
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return -ENOMEM;
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serio->id.type = SERIO_8042;
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serio->write = rpckbd_write;
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serio->open = rpckbd_open;
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serio->close = rpckbd_close;
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serio->dev.parent = &dev->dev;
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strlcpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name));
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strlcpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys));
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platform_set_drvdata(dev, serio);
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serio_register_port(serio);
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return 0;
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}
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static int __devexit rpckbd_remove(struct platform_device *dev)
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{
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struct serio *serio = platform_get_drvdata(dev);
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serio_unregister_port(serio);
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return 0;
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}
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static struct platform_driver rpckbd_driver = {
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.probe = rpckbd_probe,
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.remove = __devexit_p(rpckbd_remove),
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.driver = {
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.name = "kart",
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.owner = THIS_MODULE,
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},
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};
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static int __init rpckbd_init(void)
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{
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return platform_driver_register(&rpckbd_driver);
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}
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static void __exit rpckbd_exit(void)
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{
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platform_driver_unregister(&rpckbd_driver);
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}
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module_init(rpckbd_init);
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module_exit(rpckbd_exit);
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