155 lines
3.3 KiB
C
155 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#include <linux/module.h>
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#include <linux/interrupt.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 <linux/slab.h>
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#include <mach/hardware.h>
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#include <asm/hardware/iomd.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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struct rpckbd_data {
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int tx_irq;
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int rx_irq;
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};
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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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struct rpckbd_data *rpckbd = port->port_data;
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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(rpckbd->rx_irq, 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(rpckbd->tx_irq, 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(rpckbd->rx_irq, port);
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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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struct rpckbd_data *rpckbd = port->port_data;
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free_irq(rpckbd->rx_irq, port);
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free_irq(rpckbd->tx_irq, 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 rpckbd_probe(struct platform_device *dev)
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{
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struct rpckbd_data *rpckbd;
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struct serio *serio;
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int tx_irq, rx_irq;
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rx_irq = platform_get_irq(dev, 0);
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if (rx_irq <= 0)
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return rx_irq < 0 ? rx_irq : -ENXIO;
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tx_irq = platform_get_irq(dev, 1);
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if (tx_irq <= 0)
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return tx_irq < 0 ? tx_irq : -ENXIO;
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serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
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rpckbd = kzalloc(sizeof(*rpckbd), GFP_KERNEL);
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if (!serio || !rpckbd) {
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kfree(rpckbd);
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kfree(serio);
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return -ENOMEM;
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}
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rpckbd->rx_irq = rx_irq;
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rpckbd->tx_irq = tx_irq;
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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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serio->port_data = rpckbd;
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strscpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name));
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strscpy(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 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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struct rpckbd_data *rpckbd = serio->port_data;
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serio_unregister_port(serio);
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kfree(rpckbd);
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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 = rpckbd_remove,
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.driver = {
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.name = "kart",
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},
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};
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module_platform_driver(rpckbd_driver);
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