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