summaryrefslogtreecommitdiff
path: root/drivers/input/keyboard/mcs_touchkey.c
blob: 31090d71a685d18fe7bc0093b1927f304e3de7eb (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
/*
 * Touchkey driver for MELFAS MCS5000/5080 controller
 *
 * Copyright (C) 2010 Samsung Electronics Co.Ltd
 * Author: HeungJun Kim <riverful.kim@samsung.com>
 * Author: Joonyoung Shim <jy0922.shim@samsung.com>
 *
 * 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, or (at your
 * option) any later version.
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/i2c/mcs.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/pm.h>

/* MCS5000 Touchkey */
#define MCS5000_TOUCHKEY_STATUS		0x04
#define MCS5000_TOUCHKEY_STATUS_PRESS	7
#define MCS5000_TOUCHKEY_FW		0x0a
#define MCS5000_TOUCHKEY_BASE_VAL	0x61

/* MCS5080 Touchkey */
#define MCS5080_TOUCHKEY_STATUS		0x00
#define MCS5080_TOUCHKEY_STATUS_PRESS	3
#define MCS5080_TOUCHKEY_FW		0x01
#define MCS5080_TOUCHKEY_BASE_VAL	0x1

enum mcs_touchkey_type {
	MCS5000_TOUCHKEY,
	MCS5080_TOUCHKEY,
};

struct mcs_touchkey_chip {
	unsigned int status_reg;
	unsigned int pressbit;
	unsigned int press_invert;
	unsigned int baseval;
};

struct mcs_touchkey_data {
	void (*poweron)(bool);

	struct i2c_client *client;
	struct input_dev *input_dev;
	struct mcs_touchkey_chip chip;
	unsigned int key_code;
	unsigned int key_val;
	unsigned short keycodes[];
};

static irqreturn_t mcs_touchkey_interrupt(int irq, void *dev_id)
{
	struct mcs_touchkey_data *data = dev_id;
	struct mcs_touchkey_chip *chip = &data->chip;
	struct i2c_client *client = data->client;
	struct input_dev *input = data->input_dev;
	unsigned int key_val;
	unsigned int pressed;
	int val;

	val = i2c_smbus_read_byte_data(client, chip->status_reg);
	if (val < 0) {
		dev_err(&client->dev, "i2c read error [%d]\n", val);
		goto out;
	}

	pressed = (val & (1 << chip->pressbit)) >> chip->pressbit;
	if (chip->press_invert)
		pressed ^= chip->press_invert;

	/* key_val is 0 when released, so we should use key_val of press. */
	if (pressed) {
		key_val = val & (0xff >> (8 - chip->pressbit));
		if (!key_val)
			goto out;
		key_val -= chip->baseval;
		data->key_code = data->keycodes[key_val];
		data->key_val = key_val;
	}

	input_event(input, EV_MSC, MSC_SCAN, data->key_val);
	input_report_key(input, data->key_code, pressed);
	input_sync(input);

	dev_dbg(&client->dev, "key %d %d %s\n", data->key_val, data->key_code,
		pressed ? "pressed" : "released");

 out:
	return IRQ_HANDLED;
}

static int mcs_touchkey_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
{
	const struct mcs_platform_data *pdata;
	struct mcs_touchkey_data *data;
	struct input_dev *input_dev;
	unsigned int fw_reg;
	int fw_ver;
	int error;
	int i;

	pdata = dev_get_platdata(&client->dev);
	if (!pdata) {
		dev_err(&client->dev, "no platform data defined\n");
		return -EINVAL;
	}

	data = kzalloc(sizeof(struct mcs_touchkey_data) +
			sizeof(data->keycodes[0]) * (pdata->key_maxval + 1),
			GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!data || !input_dev) {
		dev_err(&client->dev, "Failed to allocate memory\n");
		error = -ENOMEM;
		goto err_free_mem;
	}

	data->client = client;
	data->input_dev = input_dev;

	if (id->driver_data == MCS5000_TOUCHKEY) {
		data->chip.status_reg = MCS5000_TOUCHKEY_STATUS;
		data->chip.pressbit = MCS5000_TOUCHKEY_STATUS_PRESS;
		data->chip.baseval = MCS5000_TOUCHKEY_BASE_VAL;
		fw_reg = MCS5000_TOUCHKEY_FW;
	} else {
		data->chip.status_reg = MCS5080_TOUCHKEY_STATUS;
		data->chip.pressbit = MCS5080_TOUCHKEY_STATUS_PRESS;
		data->chip.press_invert = 1;
		data->chip.baseval = MCS5080_TOUCHKEY_BASE_VAL;
		fw_reg = MCS5080_TOUCHKEY_FW;
	}

	fw_ver = i2c_smbus_read_byte_data(client, fw_reg);
	if (fw_ver < 0) {
		error = fw_ver;
		dev_err(&client->dev, "i2c read error[%d]\n", error);
		goto err_free_mem;
	}
	dev_info(&client->dev, "Firmware version: %d\n", fw_ver);

	input_dev->name = "MELFAS MCS Touchkey";
	input_dev->id.bustype = BUS_I2C;
	input_dev->dev.parent = &client->dev;
	input_dev->evbit[0] = BIT_MASK(EV_KEY);
	if (!pdata->no_autorepeat)
		input_dev->evbit[0] |= BIT_MASK(EV_REP);
	input_dev->keycode = data->keycodes;
	input_dev->keycodesize = sizeof(data->keycodes[0]);
	input_dev->keycodemax = pdata->key_maxval + 1;

	for (i = 0; i < pdata->keymap_size; i++) {
		unsigned int val = MCS_KEY_VAL(pdata->keymap[i]);
		unsigned int code = MCS_KEY_CODE(pdata->keymap[i]);

		data->keycodes[val] = code;
		__set_bit(code, input_dev->keybit);
	}

	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
	input_set_drvdata(input_dev, data);

	if (pdata->cfg_pin)
		pdata->cfg_pin();

	if (pdata->poweron) {
		data->poweron = pdata->poweron;
		data->poweron(true);
	}

	error = request_threaded_irq(client->irq, NULL, mcs_touchkey_interrupt,
				     IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
				     client->dev.driver->name, data);
	if (error) {
		dev_err(&client->dev, "Failed to register interrupt\n");
		goto err_free_mem;
	}

	error = input_register_device(input_dev);
	if (error)
		goto err_free_irq;

	i2c_set_clientdata(client, data);
	return 0;

err_free_irq:
	free_irq(client->irq, data);
err_free_mem:
	input_free_device(input_dev);
	kfree(data);
	return error;
}

static int mcs_touchkey_remove(struct i2c_client *client)
{
	struct mcs_touchkey_data *data = i2c_get_clientdata(client);

	free_irq(client->irq, data);
	if (data->poweron)
		data->poweron(false);
	input_unregister_device(data->input_dev);
	kfree(data);

	return 0;
}

static void mcs_touchkey_shutdown(struct i2c_client *client)
{
	struct mcs_touchkey_data *data = i2c_get_clientdata(client);

	if (data->poweron)
		data->poweron(false);
}

#ifdef CONFIG_PM_SLEEP
static int mcs_touchkey_suspend(struct device *dev)
{
	struct mcs_touchkey_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;

	/* Disable the work */
	disable_irq(client->irq);

	/* Finally turn off the power */
	if (data->poweron)
		data->poweron(false);

	return 0;
}

static int mcs_touchkey_resume(struct device *dev)
{
	struct mcs_touchkey_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;

	/* Enable the device first */
	if (data->poweron)
		data->poweron(true);

	/* Enable irq again */
	enable_irq(client->irq);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(mcs_touchkey_pm_ops,
			 mcs_touchkey_suspend, mcs_touchkey_resume);

static const struct i2c_device_id mcs_touchkey_id[] = {
	{ "mcs5000_touchkey", MCS5000_TOUCHKEY },
	{ "mcs5080_touchkey", MCS5080_TOUCHKEY },
	{ }
};
MODULE_DEVICE_TABLE(i2c, mcs_touchkey_id);

static struct i2c_driver mcs_touchkey_driver = {
	.driver = {
		.name	= "mcs_touchkey",
		.pm	= &mcs_touchkey_pm_ops,
	},
	.probe		= mcs_touchkey_probe,
	.remove		= mcs_touchkey_remove,
	.shutdown       = mcs_touchkey_shutdown,
	.id_table	= mcs_touchkey_id,
};

module_i2c_driver(mcs_touchkey_driver);

/* Module information */
MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
MODULE_AUTHOR("HeungJun Kim <riverful.kim@samsung.com>");
MODULE_DESCRIPTION("Touchkey driver for MELFAS MCS5000/5080 controller");
MODULE_LICENSE("GPL");