summaryrefslogtreecommitdiff
path: root/drivers/input/misc/da9063_onkey.c
blob: f577585ef999af29425531b9cc75fe494f1c62ba (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
/*
 * OnKey device driver for DA9063
 * Copyright (C) 2015  Dialog Semiconductor Ltd.
 *
 * 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.
 *
 * 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/errno.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/workqueue.h>
#include <linux/regmap.h>
#include <linux/of.h>
#include <linux/mfd/da9063/core.h>
#include <linux/mfd/da9063/pdata.h>
#include <linux/mfd/da9063/registers.h>

struct da9063_onkey {
	struct da9063 *hw;
	struct delayed_work work;
	struct input_dev *input;
	struct device *dev;
	bool key_power;
};

static void da9063_poll_on(struct work_struct *work)
{
	struct da9063_onkey *onkey = container_of(work, struct da9063_onkey,
						  work.work);
	unsigned int val;
	int fault_log = 0;
	bool poll = true;
	int error;

	/* Poll to see when the pin is released */
	error = regmap_read(onkey->hw->regmap, DA9063_REG_STATUS_A, &val);
	if (error) {
		dev_err(onkey->dev,
			"Failed to read ON status: %d\n", error);
		goto err_poll;
	}

	if (!(val & DA9063_NONKEY)) {
		error = regmap_update_bits(onkey->hw->regmap,
					   DA9063_REG_CONTROL_B,
					   DA9063_NONKEY_LOCK, 0);
		if (error) {
			dev_err(onkey->dev,
				"Failed to reset the Key Delay %d\n", error);
			goto err_poll;
		}

		input_report_key(onkey->input, KEY_POWER, 0);
		input_sync(onkey->input);

		poll = false;
	}

	/*
	 * If the fault log KEY_RESET is detected, then clear it
	 * and shut down the system.
	 */
	error = regmap_read(onkey->hw->regmap,
			    DA9063_REG_FAULT_LOG, &fault_log);
	if (error) {
		dev_warn(&onkey->input->dev,
			 "Cannot read FAULT_LOG: %d\n", error);
	} else if (fault_log & DA9063_KEY_RESET) {
		error = regmap_write(onkey->hw->regmap,
				     DA9063_REG_FAULT_LOG,
				     DA9063_KEY_RESET);
		if (error) {
			dev_warn(&onkey->input->dev,
				 "Cannot reset KEY_RESET fault log: %d\n",
				 error);
		} else {
			/* at this point we do any S/W housekeeping
			 * and then send shutdown command
			 */
			dev_dbg(&onkey->input->dev,
				 "Sending SHUTDOWN to DA9063 ...\n");
			error = regmap_write(onkey->hw->regmap,
					     DA9063_REG_CONTROL_F,
					     DA9063_SHUTDOWN);
			if (error)
				dev_err(&onkey->input->dev,
					"Cannot SHUTDOWN DA9063: %d\n",
					error);
		}
	}

err_poll:
	if (poll)
		schedule_delayed_work(&onkey->work, msecs_to_jiffies(50));
}

static irqreturn_t da9063_onkey_irq_handler(int irq, void *data)
{
	struct da9063_onkey *onkey = data;
	unsigned int val;
	int error;

	error = regmap_read(onkey->hw->regmap, DA9063_REG_STATUS_A, &val);
	if (onkey->key_power && !error && (val & DA9063_NONKEY)) {
		input_report_key(onkey->input, KEY_POWER, 1);
		input_sync(onkey->input);
		schedule_delayed_work(&onkey->work, 0);
		dev_dbg(onkey->dev, "KEY_POWER pressed.\n");
	} else {
		input_report_key(onkey->input, KEY_SLEEP, 1);
		input_sync(onkey->input);
		input_report_key(onkey->input, KEY_SLEEP, 0);
		input_sync(onkey->input);
		dev_dbg(onkey->dev, "KEY_SLEEP pressed.\n");
	}

	return IRQ_HANDLED;
}

static void da9063_cancel_poll(void *data)
{
	struct da9063_onkey *onkey = data;

	cancel_delayed_work_sync(&onkey->work);
}

static int da9063_onkey_probe(struct platform_device *pdev)
{
	struct da9063 *da9063 = dev_get_drvdata(pdev->dev.parent);
	struct da9063_pdata *pdata = dev_get_platdata(da9063->dev);
	struct da9063_onkey *onkey;
	int irq;
	int error;

	onkey = devm_kzalloc(&pdev->dev, sizeof(struct da9063_onkey),
			     GFP_KERNEL);
	if (!onkey) {
		dev_err(&pdev->dev, "Failed to allocate memory.\n");
		return -ENOMEM;
	}

	onkey->dev = &pdev->dev;
	onkey->hw = da9063;

	if (pdata)
		onkey->key_power = pdata->key_power;
	else
		onkey->key_power =
			!of_property_read_bool(pdev->dev.of_node,
					       "dlg,disable-key-power");

	onkey->input = devm_input_allocate_device(&pdev->dev);
	if (!onkey->input) {
		dev_err(&pdev->dev, "Failed to allocated input device.\n");
		return -ENOMEM;
	}

	onkey->input->name = DA9063_DRVNAME_ONKEY;
	onkey->input->phys = DA9063_DRVNAME_ONKEY "/input0";
	onkey->input->dev.parent = &pdev->dev;

	if (onkey->key_power)
		input_set_capability(onkey->input, EV_KEY, KEY_POWER);

	input_set_capability(onkey->input, EV_KEY, KEY_SLEEP);

	INIT_DELAYED_WORK(&onkey->work, da9063_poll_on);

	error = devm_add_action(&pdev->dev, da9063_cancel_poll, onkey);
	if (error) {
		dev_err(&pdev->dev,
			"Failed to add cancel poll action: %d\n",
			error);
		return error;
	}

	irq = platform_get_irq_byname(pdev, "ONKEY");
	if (irq < 0) {
		error = irq;
		dev_err(&pdev->dev, "Failed to get platform IRQ: %d\n", error);
		return error;
	}

	error = devm_request_threaded_irq(&pdev->dev, irq,
					  NULL, da9063_onkey_irq_handler,
					  IRQF_TRIGGER_LOW | IRQF_ONESHOT,
					  "ONKEY", onkey);
	if (error) {
		dev_err(&pdev->dev,
			"Failed to request IRQ %d: %d\n", irq, error);
		return error;
	}

	error = input_register_device(onkey->input);
	if (error) {
		dev_err(&pdev->dev,
			"Failed to register input device: %d\n", error);
		return error;
	}

	platform_set_drvdata(pdev, onkey);
	return 0;
}

static struct platform_driver da9063_onkey_driver = {
	.probe	= da9063_onkey_probe,
	.driver	= {
		.name	= DA9063_DRVNAME_ONKEY,
	},
};
module_platform_driver(da9063_onkey_driver);

MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
MODULE_DESCRIPTION("Onkey device driver for Dialog DA9063");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DA9063_DRVNAME_ONKEY);