175 lines
3.7 KiB
C
175 lines
3.7 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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*
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* Based on the work of:
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* Richard Zidlicky <Richard.Zidlicky@stud.informatik.uni-erlangen.de>
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*/
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/*
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* Q40 PS/2 keyboard controller driver for Linux/m68k
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*/
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#include <linux/module.h>
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#include <linux/serio.h>
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#include <linux/interrupt.h>
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#include <linux/err.h>
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#include <linux/bitops.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <asm/io.h>
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#include <linux/uaccess.h>
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#include <asm/q40_master.h>
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#include <asm/irq.h>
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#include <asm/q40ints.h>
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#define DRV_NAME "q40kbd"
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MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
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MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:" DRV_NAME);
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struct q40kbd {
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struct serio *port;
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spinlock_t lock;
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};
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static irqreturn_t q40kbd_interrupt(int irq, void *dev_id)
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{
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struct q40kbd *q40kbd = dev_id;
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unsigned long flags;
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spin_lock_irqsave(&q40kbd->lock, flags);
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if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))
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serio_interrupt(q40kbd->port, master_inb(KEYCODE_REG), 0);
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master_outb(-1, KEYBOARD_UNLOCK_REG);
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spin_unlock_irqrestore(&q40kbd->lock, flags);
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return IRQ_HANDLED;
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}
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/*
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* q40kbd_flush() flushes all data that may be in the keyboard buffers
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*/
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static void q40kbd_flush(struct q40kbd *q40kbd)
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{
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int maxread = 100;
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unsigned long flags;
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spin_lock_irqsave(&q40kbd->lock, flags);
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while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)))
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master_inb(KEYCODE_REG);
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spin_unlock_irqrestore(&q40kbd->lock, flags);
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}
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static void q40kbd_stop(void)
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{
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master_outb(0, KEY_IRQ_ENABLE_REG);
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master_outb(-1, KEYBOARD_UNLOCK_REG);
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}
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/*
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* q40kbd_open() is called when a port is open by the higher layer.
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* It allocates the interrupt and enables in in the chip.
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*/
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static int q40kbd_open(struct serio *port)
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{
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struct q40kbd *q40kbd = port->port_data;
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q40kbd_flush(q40kbd);
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/* off we go */
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master_outb(-1, KEYBOARD_UNLOCK_REG);
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master_outb(1, KEY_IRQ_ENABLE_REG);
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return 0;
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}
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static void q40kbd_close(struct serio *port)
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{
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struct q40kbd *q40kbd = port->port_data;
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q40kbd_stop();
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q40kbd_flush(q40kbd);
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}
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static int q40kbd_probe(struct platform_device *pdev)
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{
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struct q40kbd *q40kbd;
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struct serio *port;
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int error;
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q40kbd = kzalloc(sizeof(struct q40kbd), GFP_KERNEL);
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port = kzalloc(sizeof(struct serio), GFP_KERNEL);
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if (!q40kbd || !port) {
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error = -ENOMEM;
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goto err_free_mem;
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}
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q40kbd->port = port;
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spin_lock_init(&q40kbd->lock);
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port->id.type = SERIO_8042;
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port->open = q40kbd_open;
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port->close = q40kbd_close;
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port->port_data = q40kbd;
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port->dev.parent = &pdev->dev;
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strscpy(port->name, "Q40 Kbd Port", sizeof(port->name));
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strscpy(port->phys, "Q40", sizeof(port->phys));
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q40kbd_stop();
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error = request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0,
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DRV_NAME, q40kbd);
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if (error) {
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dev_err(&pdev->dev, "Can't get irq %d.\n", Q40_IRQ_KEYBOARD);
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goto err_free_mem;
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}
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serio_register_port(q40kbd->port);
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platform_set_drvdata(pdev, q40kbd);
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printk(KERN_INFO "serio: Q40 kbd registered\n");
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return 0;
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err_free_mem:
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kfree(port);
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kfree(q40kbd);
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return error;
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}
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static int q40kbd_remove(struct platform_device *pdev)
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{
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struct q40kbd *q40kbd = platform_get_drvdata(pdev);
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/*
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* q40kbd_close() will be called as part of unregistering
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* and will ensure that IRQ is turned off, so it is safe
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* to unregister port first and free IRQ later.
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*/
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serio_unregister_port(q40kbd->port);
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free_irq(Q40_IRQ_KEYBOARD, q40kbd);
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kfree(q40kbd);
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return 0;
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}
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static struct platform_driver q40kbd_driver = {
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.driver = {
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.name = "q40kbd",
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},
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.remove = q40kbd_remove,
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};
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module_platform_driver_probe(q40kbd_driver, q40kbd_probe);
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