1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (c) 2000-2001 Vojtech Pavlik
5 * Based on the work of:
6 * Richard Zidlicky <Richard.Zidlicky@stud.informatik.uni-erlangen.de>
10 * Q40 PS/2 keyboard controller driver for Linux/m68k
13 #include <linux/module.h>
14 #include <linux/serio.h>
15 #include <linux/interrupt.h>
16 #include <linux/err.h>
17 #include <linux/bitops.h>
18 #include <linux/platform_device.h>
19 #include <linux/slab.h>
22 #include <linux/uaccess.h>
23 #include <asm/q40_master.h>
25 #include <asm/q40ints.h>
27 #define DRV_NAME "q40kbd"
29 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
30 MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver");
31 MODULE_LICENSE("GPL");
32 MODULE_ALIAS("platform:" DRV_NAME);
39 static irqreturn_t q40kbd_interrupt(int irq, void *dev_id)
41 struct q40kbd *q40kbd = dev_id;
44 spin_lock_irqsave(&q40kbd->lock, flags);
46 if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))
47 serio_interrupt(q40kbd->port, master_inb(KEYCODE_REG), 0);
49 master_outb(-1, KEYBOARD_UNLOCK_REG);
51 spin_unlock_irqrestore(&q40kbd->lock, flags);
57 * q40kbd_flush() flushes all data that may be in the keyboard buffers
60 static void q40kbd_flush(struct q40kbd *q40kbd)
65 spin_lock_irqsave(&q40kbd->lock, flags);
67 while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)))
68 master_inb(KEYCODE_REG);
70 spin_unlock_irqrestore(&q40kbd->lock, flags);
73 static void q40kbd_stop(void)
75 master_outb(0, KEY_IRQ_ENABLE_REG);
76 master_outb(-1, KEYBOARD_UNLOCK_REG);
80 * q40kbd_open() is called when a port is open by the higher layer.
81 * It allocates the interrupt and enables in in the chip.
84 static int q40kbd_open(struct serio *port)
86 struct q40kbd *q40kbd = port->port_data;
91 master_outb(-1, KEYBOARD_UNLOCK_REG);
92 master_outb(1, KEY_IRQ_ENABLE_REG);
97 static void q40kbd_close(struct serio *port)
99 struct q40kbd *q40kbd = port->port_data;
102 q40kbd_flush(q40kbd);
105 static int q40kbd_probe(struct platform_device *pdev)
107 struct q40kbd *q40kbd;
111 q40kbd = kzalloc(sizeof(struct q40kbd), GFP_KERNEL);
112 port = kzalloc(sizeof(struct serio), GFP_KERNEL);
113 if (!q40kbd || !port) {
119 spin_lock_init(&q40kbd->lock);
121 port->id.type = SERIO_8042;
122 port->open = q40kbd_open;
123 port->close = q40kbd_close;
124 port->port_data = q40kbd;
125 port->dev.parent = &pdev->dev;
126 strscpy(port->name, "Q40 Kbd Port", sizeof(port->name));
127 strscpy(port->phys, "Q40", sizeof(port->phys));
131 error = request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0,
134 dev_err(&pdev->dev, "Can't get irq %d.\n", Q40_IRQ_KEYBOARD);
138 serio_register_port(q40kbd->port);
140 platform_set_drvdata(pdev, q40kbd);
141 printk(KERN_INFO "serio: Q40 kbd registered\n");
151 static int q40kbd_remove(struct platform_device *pdev)
153 struct q40kbd *q40kbd = platform_get_drvdata(pdev);
156 * q40kbd_close() will be called as part of unregistering
157 * and will ensure that IRQ is turned off, so it is safe
158 * to unregister port first and free IRQ later.
160 serio_unregister_port(q40kbd->port);
161 free_irq(Q40_IRQ_KEYBOARD, q40kbd);
167 static struct platform_driver q40kbd_driver = {
171 .remove = q40kbd_remove,
174 module_platform_driver_probe(q40kbd_driver, q40kbd_probe);