summaryrefslogtreecommitdiffstats
path: root/drivers/input/qt1070.c
blob: 76a4d66255018bd883a9320008683d71ac732350 (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
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
 */

#include <common.h>
#include <errno.h>
#include <clock.h>
#include <poller.h>
#include <kfifo.h>
#include <i2c/i2c.h>
#include <malloc.h>
#include <readkey.h>
#include <input/qt1070.h>
#include <gpio.h>

#define QT1070_CHIP_ID		0x2e

#define QT1070_READ_CHIP_ID	0x00
#define QT1070_FW_VERSION	0x01
#define QT1070_DET_STATUS	0x02
#define QT1070_KEY_STATUS	0x03

/* Calibrate */
#define QT1070_CALIBRATE_CMD	0x38
#define QT1070_CAL_TIME		200

/* Reset */
#define QT1070_RESET		0x39
#define QT1070_RESET_TIME	255

static int default_code[QT1070_NB_BUTTONS] = {
	BB_KEY_ENTER, BB_KEY_HOME, BB_KEY_UP, BB_KEY_DOWN,
	BB_KEY_RIGHT, BB_KEY_LEFT, BB_KEY_CLEAR_SCREEN };

struct qt1070_data {
	int code[QT1070_NB_BUTTONS];

	int irq_pin;

	u64 start;

	/* optional */
	int fifo_size;

	struct i2c_client *client;
	u8 button_state[QT1070_NB_BUTTONS];
	u8 previous_state;

	struct kfifo *recv_fifo;
	struct poller_struct poller;
	struct console_device cdev;
};

static inline struct qt1070_data *
poller_to_qt_data(struct poller_struct *poller)
{
	return container_of(poller, struct qt1070_data, poller);
}

static inline struct qt1070_data *
cdev_to_qt_data(struct console_device *cdev)
{
	return container_of(cdev, struct qt1070_data, cdev);
}

static bool qt1070_read(struct qt1070_data *data, u8 reg, u8 *val)
{
	int ret;

	ret = i2c_read_reg(data->client, reg, val, 1);

	if (ret < 0)
		return ret;
	if (ret != 1)
		return -EIO;
	return 0;
}

static bool qt1070_write(struct qt1070_data *data, u8 reg, const u8 val)
{
	int ret;

	ret = i2c_write_reg(data->client, reg, &val, 1);
	if (ret < 0)
		return ret;
	if (ret != 1)
		return -EIO;
	return 0;
}

static void qt1070_poller(struct poller_struct *poller)
{
	struct qt1070_data *data = poller_to_qt_data(poller);
	int i;
	u8 buf, bt;
	u8 mask = 0x1;

	if (gpio_is_valid(data->irq_pin)) {
		/* active low */
		if (gpio_get_value(data->irq_pin))
			return;
	}

	qt1070_read(data, QT1070_DET_STATUS, &buf);

	if (qt1070_read(data, QT1070_KEY_STATUS, &buf))
		return;

	if (!buf & !data->previous_state)
		return;

	for (i = 0; i < QT1070_NB_BUTTONS; i++) {
		bt = buf & mask;

		if (!bt && data->button_state[i]) {
			dev_dbg(data->cdev.dev, "release key(%d) as %d\n", i, data->code[i]);
			kfifo_put(data->recv_fifo, (u_char*)&data->code[i], sizeof(int));
		} else if (bt) {
			dev_dbg(data->cdev.dev, "pressed key(%d) as %d\n", i, data->code[i]);
		}

		data->button_state[i] = bt;
		mask <<= 1;
	}

	data->previous_state = buf;
}

static void qt1070_reset_poller(struct poller_struct *poller)
{
	struct qt1070_data *data = poller_to_qt_data(poller);
	u8 buf;

	if (!is_timeout_non_interruptible(data->start, QT1070_RESET_TIME * MSECOND))
		return;

	/* clear the status */
	qt1070_read(data, QT1070_DET_STATUS, &buf);

	poller->func = qt1070_poller;
}

static void qt1070_calibrate_poller(struct poller_struct *poller)
{
	struct qt1070_data *data = poller_to_qt_data(poller);
	int ret;

	if (!is_timeout_non_interruptible(data->start, QT1070_CAL_TIME * MSECOND))
		return;

	/* Soft reset */
	ret = qt1070_write(data, QT1070_RESET, 1);
	if (ret) {
		dev_err(data->cdev.dev, "can not reset the chip (%d)\n", ret);
		poller_unregister(poller);
		return;
	}
	data->start = get_time_ns();

	poller->func = qt1070_reset_poller;
}

static int qt1070_tstc(struct console_device *cdev)
{
	struct qt1070_data *data = cdev_to_qt_data(cdev);

	return (kfifo_len(data->recv_fifo) == 0) ? 0 : 1;
}

static int qt1070_getc(struct console_device *cdev)
{
	int code = 0;
	struct qt1070_data *data = cdev_to_qt_data(cdev);

	kfifo_get(data->recv_fifo, (u_char*)&code, sizeof(int));
	return code;
}

static int qt1070_pdata_init(struct device_d *dev, struct qt1070_data *data)
{
	struct qt1070_platform_data *pdata = dev->platform_data;
	int ret;

	if (!pdata)
		return 0;

	if (pdata->nb_code)
		memcpy(data->code, pdata->code, sizeof(int) * pdata->nb_code);

	if (!gpio_is_valid(pdata->irq_pin))
		return 0;

	ret = gpio_request(pdata->irq_pin, "qt1070");
	if (ret)
		return ret;

	ret = gpio_direction_input(pdata->irq_pin);
	if (ret)
		goto err;

	data->irq_pin = pdata->irq_pin;

	return 0;
err:
	gpio_free(pdata->irq_pin);
	return ret;
}

static int qt1070_probe(struct device_d *dev)
{
	struct console_device *cdev;
	struct qt1070_data *data;
	u8 fw_version, chip_id;
	int ret;

	data = xzalloc(sizeof(*data));
	data->client = to_i2c_client(dev);
	data->irq_pin = -EINVAL;

	ret = qt1070_read(data, QT1070_READ_CHIP_ID, &chip_id);
	if (ret) {
		dev_err(dev, "can not read chip id (%d)\n", ret);
		goto err;
	}

	if (chip_id != QT1070_CHIP_ID) {
		dev_err(dev, "unsupported id 0x%x\n", chip_id);
		ret = -ENXIO;
		goto err;
	}

	ret = qt1070_read(data, QT1070_FW_VERSION, &fw_version);
	if (ret) {
		dev_err(dev, "can not read firmware version (%d)\n", ret);
		goto err;
	}

	dev_add_param_uint32_fixed(dev, "fw_version", fw_version, "0x%x");
	dev_add_param_uint32_fixed(dev, "chip_ip", chip_id, "0x%x");

	memcpy(data->code, default_code, sizeof(int) * ARRAY_SIZE(default_code));

	ret = qt1070_pdata_init(dev, data);
	if (ret) {
		dev_err(dev, "can not get pdata (%d)\n", ret);
		goto err;
	}

	/* Calibrate device */
	ret = qt1070_write(data, QT1070_CALIBRATE_CMD, 1);
	if (ret) {
		dev_err(dev, "can not calibrate the chip (%d)\n", ret);
		goto err;
	}
	data->start = get_time_ns();


	data->fifo_size = 50;
	data->recv_fifo = kfifo_alloc(data->fifo_size);

	data->poller.func = qt1070_calibrate_poller;

	cdev = &data->cdev;
	cdev->dev = dev;
	cdev->tstc = qt1070_tstc;
	cdev->getc = qt1070_getc;

	console_register(&data->cdev);

	ret = poller_register(&data->poller, dev_name(dev));
	if (ret)
		goto err;

	return 0;
err:
	free(data);
	return ret;
}

static struct driver_d qt1070_driver = {
	.name	= "qt1070",
	.probe	= qt1070_probe,
};
device_i2c_driver(qt1070_driver);