diff options
Diffstat (limited to 'drivers/input/serio/rpckbd.c')
| -rw-r--r-- | drivers/input/serio/rpckbd.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/drivers/input/serio/rpckbd.c b/drivers/input/serio/rpckbd.c new file mode 100644 index 0000000..106f5ee --- /dev/null +++ b/drivers/input/serio/rpckbd.c @@ -0,0 +1,156 @@ +/* + * $Id: rpckbd.c,v 1.7 2001/09/25 10:12:07 vojtech Exp $ + * + * 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 <asm/irq.h> +#include <asm/hardware.h> +#include <asm/io.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"); + +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 pt_regs *regs) +{ + 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, regs); + handled = IRQ_HANDLED; + } + return handled; +} + +static irqreturn_t rpckbd_tx(int irq, void *dev_id, struct pt_regs *regs) +{ + 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, NULL); + 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 device *dev) +{ + struct serio *serio; + + serio = kmalloc(sizeof(struct serio), GFP_KERNEL); + if (!serio) + return -ENOMEM; + + memset(serio, 0, sizeof(struct serio)); + serio->id.type = SERIO_8042; + serio->write = rpckbd_write; + serio->open = rpckbd_open; + serio->close = rpckbd_close; + serio->dev.parent = dev; + strlcpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name)); + strlcpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys)); + + dev_set_drvdata(dev, serio); + serio_register_port(serio); + return 0; +} + +static int __devexit rpckbd_remove(struct device *dev) +{ + struct serio *serio = dev_get_drvdata(dev); + serio_unregister_port(serio); + return 0; +} + +static struct device_driver rpckbd_driver = { + .name = "kart", + .bus = &platform_bus_type, + .probe = rpckbd_probe, + .remove = __devexit_p(rpckbd_remove), +}; + +static int __init rpckbd_init(void) +{ + return driver_register(&rpckbd_driver); +} + +static void __exit rpckbd_exit(void) +{ + driver_unregister(&rpckbd_driver); +} + +module_init(rpckbd_init); +module_exit(rpckbd_exit); |
