summaryrefslogtreecommitdiffstats
path: root/drivers/input/serio/pcips2.c
blob: 1dacbe0d934832e54cae29353fd258e9a24bb339 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
/*
 * linux/drivers/input/serio/pcips2.c
 *
 *  Copyright (C) 2003 Russell King, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License.
 *
 *  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/init.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 __devinit 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;
	strlcpy(serio->name, pci_name(dev), sizeof(serio->name));
	strlcpy(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 __devexit pcips2_remove(struct pci_dev *dev)
{
	struct pcips2_data *ps2if = pci_get_drvdata(dev);

	serio_unregister_port(ps2if->io);
	pci_set_drvdata(dev, NULL);
	kfree(ps2if);
	pci_release_regions(dev);
	pci_disable_device(dev);
}

static 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, }
};

static struct pci_driver pcips2_driver = {
	.name			= "pcips2",
	.id_table		= pcips2_ids,
	.probe			= pcips2_probe,
	.remove			= __devexit_p(pcips2_remove),
};

static int __init pcips2_init(void)
{
	return pci_register_driver(&pcips2_driver);
}

static void __exit pcips2_exit(void)
{
	pci_unregister_driver(&pcips2_driver);
}

module_init(pcips2_init);
module_exit(pcips2_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
MODULE_DESCRIPTION("PCI PS/2 keyboard/mouse driver");
MODULE_DEVICE_TABLE(pci, pcips2_ids);
OpenPOWER on IntegriCloud