summaryrefslogtreecommitdiffstats
path: root/drivers/input/keyboard/clps711x-keypad.c
blob: 4c1a3e611edd7490c5401ee4e39cc16f9fb4459b (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Cirrus Logic CLPS711X Keypad driver
 *
 * Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
 */

#include <linux/input.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/gpio/consumer.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/sched.h>
#include <linux/input/matrix_keypad.h>
#include <linux/mfd/syscon.h>
#include <linux/mfd/syscon/clps711x.h>

#define CLPS711X_KEYPAD_COL_COUNT	8

struct clps711x_gpio_data {
	struct gpio_desc *desc;
	DECLARE_BITMAP(last_state, CLPS711X_KEYPAD_COL_COUNT);
};

struct clps711x_keypad_data {
	struct regmap			*syscon;
	int				row_count;
	unsigned int			row_shift;
	struct clps711x_gpio_data	*gpio_data;
};

static void clps711x_keypad_poll(struct input_dev *input)
{
	const unsigned short *keycodes = input->keycode;
	struct clps711x_keypad_data *priv = input_get_drvdata(input);
	bool sync = false;
	int col, row;

	for (col = 0; col < CLPS711X_KEYPAD_COL_COUNT; col++) {
		/* Assert column */
		regmap_update_bits(priv->syscon, SYSCON_OFFSET,
				   SYSCON1_KBDSCAN_MASK,
				   SYSCON1_KBDSCAN(8 + col));

		/* Scan rows */
		for (row = 0; row < priv->row_count; row++) {
			struct clps711x_gpio_data *data = &priv->gpio_data[row];
			bool state, state1;

			/* Read twice for protection against fluctuations */
			do {
				state = gpiod_get_value_cansleep(data->desc);
				cond_resched();
				state1 = gpiod_get_value_cansleep(data->desc);
			} while (state != state1);

			if (test_bit(col, data->last_state) != state) {
				int code = MATRIX_SCAN_CODE(row, col,
							    priv->row_shift);

				if (state) {
					set_bit(col, data->last_state);
					input_event(input,
						    EV_MSC, MSC_SCAN, code);
				} else {
					clear_bit(col, data->last_state);
				}

				if (keycodes[code])
					input_report_key(input,
							 keycodes[code], state);
				sync = true;
			}
		}

		/* Set all columns to low */
		regmap_update_bits(priv->syscon, SYSCON_OFFSET,
				   SYSCON1_KBDSCAN_MASK, SYSCON1_KBDSCAN(1));
	}

	if (sync)
		input_sync(input);
}

static int clps711x_keypad_probe(struct platform_device *pdev)
{
	struct clps711x_keypad_data *priv;
	struct device *dev = &pdev->dev;
	struct input_dev *input;
	u32 poll_interval;
	int i, err;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->syscon = syscon_regmap_lookup_by_phandle(dev->of_node, "syscon");
	if (IS_ERR(priv->syscon))
		return PTR_ERR(priv->syscon);

	priv->row_count = gpiod_count(dev, "row");
	if (priv->row_count < 1)
		return -EINVAL;

	priv->gpio_data = devm_kcalloc(dev,
				priv->row_count, sizeof(*priv->gpio_data),
				GFP_KERNEL);
	if (!priv->gpio_data)
		return -ENOMEM;

	priv->row_shift = get_count_order(CLPS711X_KEYPAD_COL_COUNT);

	for (i = 0; i < priv->row_count; i++) {
		struct clps711x_gpio_data *data = &priv->gpio_data[i];

		data->desc = devm_gpiod_get_index(dev, "row", i, GPIOD_IN);
		if (IS_ERR(data->desc))
			return PTR_ERR(data->desc);
	}

	err = device_property_read_u32(dev, "poll-interval", &poll_interval);
	if (err)
		return err;

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

	input_set_drvdata(input, priv);

	input->name		= pdev->name;
	input->dev.parent	= dev;
	input->id.bustype	= BUS_HOST;
	input->id.vendor	= 0x0001;
	input->id.product	= 0x0001;
	input->id.version	= 0x0100;

	err = matrix_keypad_build_keymap(NULL, NULL, priv->row_count,
					 CLPS711X_KEYPAD_COL_COUNT,
					 NULL, input);
	if (err)
		return err;

	input_set_capability(input, EV_MSC, MSC_SCAN);
	if (device_property_read_bool(dev, "autorepeat"))
		__set_bit(EV_REP, input->evbit);

	/* Set all columns to low */
	regmap_update_bits(priv->syscon, SYSCON_OFFSET, SYSCON1_KBDSCAN_MASK,
			   SYSCON1_KBDSCAN(1));


	err = input_setup_polling(input, clps711x_keypad_poll);
	if (err)
		return err;

	input_set_poll_interval(input, poll_interval);

	err = input_register_device(input);
	if (err)
		return err;

	return 0;
}

static const struct of_device_id clps711x_keypad_of_match[] = {
	{ .compatible = "cirrus,ep7209-keypad", },
	{ }
};
MODULE_DEVICE_TABLE(of, clps711x_keypad_of_match);

static struct platform_driver clps711x_keypad_driver = {
	.driver	= {
		.name		= "clps711x-keypad",
		.of_match_table	= clps711x_keypad_of_match,
	},
	.probe	= clps711x_keypad_probe,
};
module_platform_driver(clps711x_keypad_driver);

MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
MODULE_DESCRIPTION("Cirrus Logic CLPS711X Keypad driver");
MODULE_LICENSE("GPL");