[go: nahoru, domu]
1/*
2 * linux/drivers/input/serio/pcips2.c
3 *
4 *  Copyright (C) 2003 Russell King, All Rights Reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License.
9 *
10 *  I'm not sure if this is a generic PS/2 PCI interface or specific to
11 *  the Mobility Electronics docking station.
12 */
13#include <linux/module.h>
14#include <linux/interrupt.h>
15#include <linux/ioport.h>
16#include <linux/input.h>
17#include <linux/pci.h>
18#include <linux/slab.h>
19#include <linux/serio.h>
20#include <linux/delay.h>
21#include <asm/io.h>
22
23#define PS2_CTRL		(0)
24#define PS2_STATUS		(1)
25#define PS2_DATA		(2)
26
27#define PS2_CTRL_CLK		(1<<0)
28#define PS2_CTRL_DAT		(1<<1)
29#define PS2_CTRL_TXIRQ		(1<<2)
30#define PS2_CTRL_ENABLE		(1<<3)
31#define PS2_CTRL_RXIRQ		(1<<4)
32
33#define PS2_STAT_CLK		(1<<0)
34#define PS2_STAT_DAT		(1<<1)
35#define PS2_STAT_PARITY		(1<<2)
36#define PS2_STAT_RXFULL		(1<<5)
37#define PS2_STAT_TXBUSY		(1<<6)
38#define PS2_STAT_TXEMPTY	(1<<7)
39
40struct pcips2_data {
41	struct serio	*io;
42	unsigned int	base;
43	struct pci_dev	*dev;
44};
45
46static int pcips2_write(struct serio *io, unsigned char val)
47{
48	struct pcips2_data *ps2if = io->port_data;
49	unsigned int stat;
50
51	do {
52		stat = inb(ps2if->base + PS2_STATUS);
53		cpu_relax();
54	} while (!(stat & PS2_STAT_TXEMPTY));
55
56	outb(val, ps2if->base + PS2_DATA);
57
58	return 0;
59}
60
61static irqreturn_t pcips2_interrupt(int irq, void *devid)
62{
63	struct pcips2_data *ps2if = devid;
64	unsigned char status, scancode;
65	int handled = 0;
66
67	do {
68		unsigned int flag;
69
70		status = inb(ps2if->base + PS2_STATUS);
71		if (!(status & PS2_STAT_RXFULL))
72			break;
73		handled = 1;
74		scancode = inb(ps2if->base + PS2_DATA);
75		if (status == 0xff && scancode == 0xff)
76			break;
77
78		flag = (status & PS2_STAT_PARITY) ? 0 : SERIO_PARITY;
79
80		if (hweight8(scancode) & 1)
81			flag ^= SERIO_PARITY;
82
83		serio_interrupt(ps2if->io, scancode, flag);
84	} while (1);
85	return IRQ_RETVAL(handled);
86}
87
88static void pcips2_flush_input(struct pcips2_data *ps2if)
89{
90	unsigned char status, scancode;
91
92	do {
93		status = inb(ps2if->base + PS2_STATUS);
94		if (!(status & PS2_STAT_RXFULL))
95			break;
96		scancode = inb(ps2if->base + PS2_DATA);
97		if (status == 0xff && scancode == 0xff)
98			break;
99	} while (1);
100}
101
102static int pcips2_open(struct serio *io)
103{
104	struct pcips2_data *ps2if = io->port_data;
105	int ret, val = 0;
106
107	outb(PS2_CTRL_ENABLE, ps2if->base);
108	pcips2_flush_input(ps2if);
109
110	ret = request_irq(ps2if->dev->irq, pcips2_interrupt, IRQF_SHARED,
111			  "pcips2", ps2if);
112	if (ret == 0)
113		val = PS2_CTRL_ENABLE | PS2_CTRL_RXIRQ;
114
115	outb(val, ps2if->base);
116
117	return ret;
118}
119
120static void pcips2_close(struct serio *io)
121{
122	struct pcips2_data *ps2if = io->port_data;
123
124	outb(0, ps2if->base);
125
126	free_irq(ps2if->dev->irq, ps2if);
127}
128
129static int pcips2_probe(struct pci_dev *dev, const struct pci_device_id *id)
130{
131	struct pcips2_data *ps2if;
132	struct serio *serio;
133	int ret;
134
135	ret = pci_enable_device(dev);
136	if (ret)
137		goto out;
138
139	ret = pci_request_regions(dev, "pcips2");
140	if (ret)
141		goto disable;
142
143	ps2if = kzalloc(sizeof(struct pcips2_data), GFP_KERNEL);
144	serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
145	if (!ps2if || !serio) {
146		ret = -ENOMEM;
147		goto release;
148	}
149
150
151	serio->id.type		= SERIO_8042;
152	serio->write		= pcips2_write;
153	serio->open		= pcips2_open;
154	serio->close		= pcips2_close;
155	strlcpy(serio->name, pci_name(dev), sizeof(serio->name));
156	strlcpy(serio->phys, dev_name(&dev->dev), sizeof(serio->phys));
157	serio->port_data	= ps2if;
158	serio->dev.parent	= &dev->dev;
159	ps2if->io		= serio;
160	ps2if->dev		= dev;
161	ps2if->base		= pci_resource_start(dev, 0);
162
163	pci_set_drvdata(dev, ps2if);
164
165	serio_register_port(ps2if->io);
166	return 0;
167
168 release:
169	kfree(ps2if);
170	kfree(serio);
171	pci_release_regions(dev);
172 disable:
173	pci_disable_device(dev);
174 out:
175	return ret;
176}
177
178static void pcips2_remove(struct pci_dev *dev)
179{
180	struct pcips2_data *ps2if = pci_get_drvdata(dev);
181
182	serio_unregister_port(ps2if->io);
183	kfree(ps2if);
184	pci_release_regions(dev);
185	pci_disable_device(dev);
186}
187
188static const struct pci_device_id pcips2_ids[] = {
189	{
190		.vendor		= 0x14f2,	/* MOBILITY */
191		.device		= 0x0123,	/* Keyboard */
192		.subvendor	= PCI_ANY_ID,
193		.subdevice	= PCI_ANY_ID,
194		.class		= PCI_CLASS_INPUT_KEYBOARD << 8,
195		.class_mask	= 0xffff00,
196	},
197	{
198		.vendor		= 0x14f2,	/* MOBILITY */
199		.device		= 0x0124,	/* Mouse */
200		.subvendor	= PCI_ANY_ID,
201		.subdevice	= PCI_ANY_ID,
202		.class		= PCI_CLASS_INPUT_MOUSE << 8,
203		.class_mask	= 0xffff00,
204	},
205	{ 0, }
206};
207MODULE_DEVICE_TABLE(pci, pcips2_ids);
208
209static struct pci_driver pcips2_driver = {
210	.name			= "pcips2",
211	.id_table		= pcips2_ids,
212	.probe			= pcips2_probe,
213	.remove			= pcips2_remove,
214};
215
216module_pci_driver(pcips2_driver);
217
218MODULE_LICENSE("GPL");
219MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
220MODULE_DESCRIPTION("PCI PS/2 keyboard/mouse driver");
221