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// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/drivers/input/serio/pcips2.c
*
* Copyright (C) 2003 Russell King, All Rights Reserved.
*
* I'm not sure if this is a generic PS/2 PCI interface or specific to
* the Mobility Electronics docking station.
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/input.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/serio.h>
#include <linux/delay.h>
#include <asm/io.h>
#define PS2_CTRL (0)
#define PS2_STATUS (1)
#define PS2_DATA (2)
#define PS2_CTRL_CLK (1<<0)
#define PS2_CTRL_DAT (1<<1)
#define PS2_CTRL_TXIRQ (1<<2)
#define PS2_CTRL_ENABLE (1<<3)
#define PS2_CTRL_RXIRQ (1<<4)
#define PS2_STAT_CLK (1<<0)
#define PS2_STAT_DAT (1<<1)
#define PS2_STAT_PARITY (1<<2)
#define PS2_STAT_RXFULL (1<<5)
#define PS2_STAT_TXBUSY (1<<6)
#define PS2_STAT_TXEMPTY (1<<7)
struct pcips2_data {
struct serio *io;
unsigned int base;
struct pci_dev *dev;
};
static int pcips2_write(struct serio *io, unsigned char val)
{
struct pcips2_data *ps2if = io->port_data;
unsigned int stat;
do {
stat = inb(ps2if->base + PS2_STATUS);
cpu_relax();
} while (!(stat & PS2_STAT_TXEMPTY));
outb(val, ps2if->base + PS2_DATA);
return 0;
}
static irqreturn_t pcips2_interrupt(int irq, void *devid)
{
struct pcips2_data *ps2if = devid;
unsigned char status, scancode;
int handled = 0;
do {
unsigned int flag;
status = inb(ps2if->base + PS2_STATUS);
if (!(status & PS2_STAT_RXFULL))
break;
handled = 1;
scancode = inb(ps2if->base + PS2_DATA);
if (status == 0xff && scancode == 0xff)
break;
flag = (status & PS2_STAT_PARITY) ? 0 : SERIO_PARITY;
if (hweight8(scancode) & 1)
flag ^= SERIO_PARITY;
serio_interrupt(ps2if->io, scancode, flag);
} while (1);
return IRQ_RETVAL(handled);
}
static void pcips2_flush_input(struct pcips2_data *ps2if)
{
unsigned char status, scancode;
do {
status = inb(ps2if->base + PS2_STATUS);
if (!(status & PS2_STAT_RXFULL))
break;
scancode = inb(ps2if->base + PS2_DATA);
if (status == 0xff && scancode == 0xff)
break;
} while (1);
}
static int pcips2_open(struct serio *io)
{
struct pcips2_data *ps2if = io->port_data;
int ret, val = 0;
outb(PS2_CTRL_ENABLE, ps2if->base);
pcips2_flush_input(ps2if);
ret = request_irq(ps2if->dev->irq, pcips2_interrupt, IRQF_SHARED,
"pcips2", ps2if);
if (ret == 0)
val = PS2_CTRL_ENABLE | PS2_CTRL_RXIRQ;
outb(val, ps2if->base);
return ret;
}
static void pcips2_close(struct serio *io)
{
struct pcips2_data *ps2if = io->port_data;
outb(0, ps2if->base);
free_irq(ps2if->dev->irq, ps2if);
}
static int pcips2_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
struct pcips2_data *ps2if;
struct serio *serio;
int ret;
ret = pci_enable_device(dev);
if (ret)
goto out;
ret = pci_request_regions(dev, "pcips2");
if (ret)
goto disable;
ps2if = kzalloc(sizeof(struct pcips2_data), GFP_KERNEL);
serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
if (!ps2if || !serio) {
ret = -ENOMEM;
goto release;
}
serio->id.type = SERIO_8042;
serio->write = pcips2_write;
serio->open = pcips2_open;
serio->close = pcips2_close;
strscpy(serio->name, pci_name(dev), sizeof(serio->name));
strscpy(serio->phys, dev_name(&dev->dev), sizeof(serio->phys));
serio->port_data = ps2if;
serio->dev.parent = &dev->dev;
ps2if->io = serio;
ps2if->dev = dev;
ps2if->base = pci_resource_start(dev, 0);
pci_set_drvdata(dev, ps2if);
serio_register_port(ps2if->io);
return 0;
release:
kfree(ps2if);
kfree(serio);
pci_release_regions(dev);
disable:
pci_disable_device(dev);
out:
return ret;
}
static void pcips2_remove(struct pci_dev *dev)
{
struct pcips2_data *ps2if = pci_get_drvdata(dev);
serio_unregister_port(ps2if->io);
kfree(ps2if);
pci_release_regions(dev);
pci_disable_device(dev);
}
static const struct pci_device_id pcips2_ids[] = {
{
.vendor = 0x14f2, /* MOBILITY */
.device = 0x0123, /* Keyboard */
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
.class = PCI_CLASS_INPUT_KEYBOARD << 8,
.class_mask = 0xffff00,
},
{
.vendor = 0x14f2, /* MOBILITY */
.device = 0x0124, /* Mouse */
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
.class = PCI_CLASS_INPUT_MOUSE << 8,
.class_mask = 0xffff00,
},
{ 0, }
};
MODULE_DEVICE_TABLE(pci, pcips2_ids);
static struct pci_driver pcips2_driver = {
.name = "pcips2",
.id_table = pcips2_ids,
.probe = pcips2_probe,
.remove = pcips2_remove,
};
module_pci_driver(pcips2_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
MODULE_DESCRIPTION("PCI PS/2 keyboard/mouse driver");
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