summaryrefslogtreecommitdiffstats
path: root/drivers/input/keyboard/goldfish_events.c
blob: b11d218604a74f67ef1e38acac05a7e929894ea2 (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
/*
 * Copyright (C) 2007 Google, Inc.
 * Copyright (C) 2012 Intel, Inc.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/types.h>
#include <linux/input.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/irq.h>
#include <linux/io.h>

enum {
	REG_READ        = 0x00,
	REG_SET_PAGE    = 0x00,
	REG_LEN         = 0x04,
	REG_DATA        = 0x08,

	PAGE_NAME       = 0x00000,
	PAGE_EVBITS     = 0x10000,
	PAGE_ABSDATA    = 0x20000 | EV_ABS,
};

struct event_dev {
	struct input_dev *input;
	int irq;
	void __iomem *addr;
	char name[0];
};

static irqreturn_t events_interrupt(int irq, void *dev_id)
{
	struct event_dev *edev = dev_id;
	unsigned type, code, value;

	type = __raw_readl(edev->addr + REG_READ);
	code = __raw_readl(edev->addr + REG_READ);
	value = __raw_readl(edev->addr + REG_READ);

	input_event(edev->input, type, code, value);
	input_sync(edev->input);
	return IRQ_HANDLED;
}

static void events_import_bits(struct event_dev *edev,
			unsigned long bits[], unsigned type, size_t count)
{
	void __iomem *addr = edev->addr;
	int i, j;
	size_t size;
	uint8_t val;

	__raw_writel(PAGE_EVBITS | type, addr + REG_SET_PAGE);

	size = __raw_readl(addr + REG_LEN) * 8;
	if (size < count)
		count = size;

	addr += REG_DATA;
	for (i = 0; i < count; i += 8) {
		val = __raw_readb(addr++);
		for (j = 0; j < 8; j++)
			if (val & 1 << j)
				set_bit(i + j, bits);
	}
}

static void events_import_abs_params(struct event_dev *edev)
{
	struct input_dev *input_dev = edev->input;
	void __iomem *addr = edev->addr;
	u32 val[4];
	int count;
	int i, j;

	__raw_writel(PAGE_ABSDATA, addr + REG_SET_PAGE);

	count = __raw_readl(addr + REG_LEN) / sizeof(val);
	if (count > ABS_MAX)
		count = ABS_MAX;

	for (i = 0; i < count; i++) {
		if (!test_bit(i, input_dev->absbit))
			continue;

		for (j = 0; j < ARRAY_SIZE(val); j++) {
			int offset = (i * ARRAY_SIZE(val) + j) * sizeof(u32);
			val[j] = __raw_readl(edev->addr + REG_DATA + offset);
		}

		input_set_abs_params(input_dev, i,
				     val[0], val[1], val[2], val[3]);
	}
}

static int events_probe(struct platform_device *pdev)
{
	struct input_dev *input_dev;
	struct event_dev *edev;
	struct resource *res;
	unsigned keymapnamelen;
	void __iomem *addr;
	int irq;
	int i;
	int error;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
		return -EINVAL;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
		return -EINVAL;

	addr = devm_ioremap(&pdev->dev, res->start, 4096);
	if (!addr)
		return -ENOMEM;

	__raw_writel(PAGE_NAME, addr + REG_SET_PAGE);
	keymapnamelen = __raw_readl(addr + REG_LEN);

	edev = devm_kzalloc(&pdev->dev,
			    sizeof(struct event_dev) + keymapnamelen + 1,
			    GFP_KERNEL);
	if (!edev)
		return -ENOMEM;

	input_dev = devm_input_allocate_device(&pdev->dev);
	if (!input_dev)
		return -ENOMEM;

	edev->input = input_dev;
	edev->addr = addr;
	edev->irq = irq;

	for (i = 0; i < keymapnamelen; i++)
		edev->name[i] = __raw_readb(edev->addr + REG_DATA + i);

	pr_debug("events_probe() keymap=%s\n", edev->name);

	input_dev->name = edev->name;
	input_dev->id.bustype = BUS_HOST;

	events_import_bits(edev, input_dev->evbit, EV_SYN, EV_MAX);
	events_import_bits(edev, input_dev->keybit, EV_KEY, KEY_MAX);
	events_import_bits(edev, input_dev->relbit, EV_REL, REL_MAX);
	events_import_bits(edev, input_dev->absbit, EV_ABS, ABS_MAX);
	events_import_bits(edev, input_dev->mscbit, EV_MSC, MSC_MAX);
	events_import_bits(edev, input_dev->ledbit, EV_LED, LED_MAX);
	events_import_bits(edev, input_dev->sndbit, EV_SND, SND_MAX);
	events_import_bits(edev, input_dev->ffbit, EV_FF, FF_MAX);
	events_import_bits(edev, input_dev->swbit, EV_SW, SW_MAX);

	events_import_abs_params(edev);

	error = devm_request_irq(&pdev->dev, edev->irq, events_interrupt, 0,
				 "goldfish-events-keypad", edev);
	if (error)
		return error;

	error = input_register_device(input_dev);
	if (error)
		return error;

	return 0;
}

static const struct of_device_id goldfish_events_of_match[] = {
	{ .compatible = "google,goldfish-events-keypad", },
	{},
};
MODULE_DEVICE_TABLE(of, goldfish_events_of_match);

static struct platform_driver events_driver = {
	.probe	= events_probe,
	.driver	= {
		.name	= "goldfish_events",
		.of_match_table = goldfish_events_of_match,
	},
};

module_platform_driver(events_driver);

MODULE_AUTHOR("Brian Swetland");
MODULE_DESCRIPTION("Goldfish Event Device");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud