summaryrefslogtreecommitdiff
path: root/drivers/input/keyboard/adp5520-keys.c
blob: 7f4a8b58efc1db89ba559407e23b826b63e96437 (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
/*
 * Keypad driver for Analog Devices ADP5520 MFD PMICs
 *
 * Copyright 2009 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/mfd/adp5520.h>
#include <linux/slab.h>
#include <linux/device.h>

struct adp5520_keys {
	struct input_dev *input;
	struct notifier_block notifier;
	struct device *master;
	unsigned short keycode[ADP5520_KEYMAPSIZE];
};

static void adp5520_keys_report_event(struct adp5520_keys *dev,
					unsigned short keymask, int value)
{
	int i;

	for (i = 0; i < ADP5520_MAXKEYS; i++)
		if (keymask & (1 << i))
			input_report_key(dev->input, dev->keycode[i], value);

	input_sync(dev->input);
}

static int adp5520_keys_notifier(struct notifier_block *nb,
				 unsigned long event, void *data)
{
	struct adp5520_keys *dev;
	uint8_t reg_val_lo, reg_val_hi;
	unsigned short keymask;

	dev = container_of(nb, struct adp5520_keys, notifier);

	if (event & ADP5520_KP_INT) {
		adp5520_read(dev->master, ADP5520_KP_INT_STAT_1, &reg_val_lo);
		adp5520_read(dev->master, ADP5520_KP_INT_STAT_2, &reg_val_hi);

		keymask = (reg_val_hi << 8) | reg_val_lo;
		/* Read twice to clear */
		adp5520_read(dev->master, ADP5520_KP_INT_STAT_1, &reg_val_lo);
		adp5520_read(dev->master, ADP5520_KP_INT_STAT_2, &reg_val_hi);
		keymask |= (reg_val_hi << 8) | reg_val_lo;
		adp5520_keys_report_event(dev, keymask, 1);
	}

	if (event & ADP5520_KR_INT) {
		adp5520_read(dev->master, ADP5520_KR_INT_STAT_1, &reg_val_lo);
		adp5520_read(dev->master, ADP5520_KR_INT_STAT_2, &reg_val_hi);

		keymask = (reg_val_hi << 8) | reg_val_lo;
		/* Read twice to clear */
		adp5520_read(dev->master, ADP5520_KR_INT_STAT_1, &reg_val_lo);
		adp5520_read(dev->master, ADP5520_KR_INT_STAT_2, &reg_val_hi);
		keymask |= (reg_val_hi << 8) | reg_val_lo;
		adp5520_keys_report_event(dev, keymask, 0);
	}

	return 0;
}

static int adp5520_keys_probe(struct platform_device *pdev)
{
	struct adp5520_keys_platform_data *pdata = dev_get_platdata(&pdev->dev);
	struct input_dev *input;
	struct adp5520_keys *dev;
	int ret, i;
	unsigned char en_mask, ctl_mask = 0;

	if (pdev->id != ID_ADP5520) {
		dev_err(&pdev->dev, "only ADP5520 supports Keypad\n");
		return -EINVAL;
	}

	if (!pdata) {
		dev_err(&pdev->dev, "missing platform data\n");
		return -EINVAL;
	}

	if (!(pdata->rows_en_mask && pdata->cols_en_mask))
		return -EINVAL;

	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
	if (!dev) {
		dev_err(&pdev->dev, "failed to alloc memory\n");
		return -ENOMEM;
	}

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

	dev->master = pdev->dev.parent;
	dev->input = input;

	input->name = pdev->name;
	input->phys = "adp5520-keys/input0";
	input->dev.parent = &pdev->dev;

	input_set_drvdata(input, dev);

	input->id.bustype = BUS_I2C;
	input->id.vendor = 0x0001;
	input->id.product = 0x5520;
	input->id.version = 0x0001;

	input->keycodesize = sizeof(dev->keycode[0]);
	input->keycodemax = pdata->keymapsize;
	input->keycode = dev->keycode;

	memcpy(dev->keycode, pdata->keymap,
		pdata->keymapsize * input->keycodesize);

	/* setup input device */
	__set_bit(EV_KEY, input->evbit);

	if (pdata->repeat)
		__set_bit(EV_REP, input->evbit);

	for (i = 0; i < input->keycodemax; i++)
		__set_bit(dev->keycode[i], input->keybit);
	__clear_bit(KEY_RESERVED, input->keybit);

	ret = input_register_device(input);
	if (ret) {
		dev_err(&pdev->dev, "unable to register input device\n");
		return ret;
	}

	en_mask = pdata->rows_en_mask | pdata->cols_en_mask;

	ret = adp5520_set_bits(dev->master, ADP5520_GPIO_CFG_1, en_mask);

	if (en_mask & ADP5520_COL_C3)
		ctl_mask |= ADP5520_C3_MODE;

	if (en_mask & ADP5520_ROW_R3)
		ctl_mask |= ADP5520_R3_MODE;

	if (ctl_mask)
		ret |= adp5520_set_bits(dev->master, ADP5520_LED_CONTROL,
			ctl_mask);

	ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP,
		pdata->rows_en_mask);

	if (ret) {
		dev_err(&pdev->dev, "failed to write\n");
		return -EIO;
	}

	dev->notifier.notifier_call = adp5520_keys_notifier;
	ret = adp5520_register_notifier(dev->master, &dev->notifier,
			ADP5520_KP_IEN | ADP5520_KR_IEN);
	if (ret) {
		dev_err(&pdev->dev, "failed to register notifier\n");
		return ret;
	}

	platform_set_drvdata(pdev, dev);
	return 0;
}

static int adp5520_keys_remove(struct platform_device *pdev)
{
	struct adp5520_keys *dev = platform_get_drvdata(pdev);

	adp5520_unregister_notifier(dev->master, &dev->notifier,
				ADP5520_KP_IEN | ADP5520_KR_IEN);

	return 0;
}

static struct platform_driver adp5520_keys_driver = {
	.driver	= {
		.name	= "adp5520-keys",
		.owner	= THIS_MODULE,
	},
	.probe		= adp5520_keys_probe,
	.remove		= adp5520_keys_remove,
};
module_platform_driver(adp5520_keys_driver);

MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Keys ADP5520 Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:adp5520-keys");