1/*
2 * Texas Instruments' TPS65217 and TPS65218 Power Button Input Driver
3 *
4 * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
5 * Author: Felipe Balbi <balbi@ti.com>
6 * Author: Marcin Niestroj <m.niestroj@grinn-global.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
13 * kind, whether express or implied; without even the implied warranty
14 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 */
17
18#include <linux/init.h>
19#include <linux/input.h>
20#include <linux/interrupt.h>
21#include <linux/kernel.h>
22#include <linux/mfd/tps65217.h>
23#include <linux/mfd/tps65218.h>
24#include <linux/module.h>
25#include <linux/of.h>
26#include <linux/platform_device.h>
27#include <linux/regmap.h>
28#include <linux/slab.h>
29
30struct tps6521x_data {
31	unsigned int reg_status;
32	unsigned int pb_mask;
33	const char *name;
34};
35
36static const struct tps6521x_data tps65217_data = {
37	.reg_status = TPS65217_REG_STATUS,
38	.pb_mask = TPS65217_STATUS_PB,
39	.name = "tps65217_pwrbutton",
40};
41
42static const struct tps6521x_data tps65218_data = {
43	.reg_status = TPS65218_REG_STATUS,
44	.pb_mask = TPS65218_STATUS_PB_STATE,
45	.name = "tps65218_pwrbutton",
46};
47
48struct tps6521x_pwrbutton {
49	struct device *dev;
50	struct regmap *regmap;
51	struct input_dev *idev;
52	const struct tps6521x_data *data;
53	char phys[32];
54};
55
56static const struct of_device_id of_tps6521x_pb_match[] = {
57	{ .compatible = "ti,tps65217-pwrbutton", .data = &tps65217_data },
58	{ .compatible = "ti,tps65218-pwrbutton", .data = &tps65218_data },
59	{ },
60};
61MODULE_DEVICE_TABLE(of, of_tps6521x_pb_match);
62
63static irqreturn_t tps6521x_pb_irq(int irq, void *_pwr)
64{
65	struct tps6521x_pwrbutton *pwr = _pwr;
66	const struct tps6521x_data *tps_data = pwr->data;
67	unsigned int reg;
68	int error;
69
70	error = regmap_read(pwr->regmap, tps_data->reg_status, &reg);
71	if (error) {
72		dev_err(pwr->dev, "can't read register: %d\n", error);
73		goto out;
74	}
75
76	if (reg & tps_data->pb_mask) {
77		input_report_key(pwr->idev, KEY_POWER, 1);
78		pm_wakeup_event(pwr->dev, 0);
79	} else {
80		input_report_key(pwr->idev, KEY_POWER, 0);
81	}
82
83	input_sync(pwr->idev);
84
85out:
86	return IRQ_HANDLED;
87}
88
89static int tps6521x_pb_probe(struct platform_device *pdev)
90{
91	struct device *dev = &pdev->dev;
92	struct tps6521x_pwrbutton *pwr;
93	struct input_dev *idev;
94	const struct of_device_id *match;
95	int error;
96	int irq;
97
98	match = of_match_node(of_tps6521x_pb_match, dev->of_node);
99	if (!match)
100		return -ENXIO;
101
102	pwr = devm_kzalloc(dev, sizeof(*pwr), GFP_KERNEL);
103	if (!pwr)
104		return -ENOMEM;
105
106	pwr->data = match->data;
107
108	idev = devm_input_allocate_device(dev);
109	if (!idev)
110		return -ENOMEM;
111
112	idev->name = pwr->data->name;
113	snprintf(pwr->phys, sizeof(pwr->phys), "%s/input0",
114		pwr->data->name);
115	idev->phys = pwr->phys;
116	idev->dev.parent = dev;
117	idev->id.bustype = BUS_I2C;
118
119	input_set_capability(idev, EV_KEY, KEY_POWER);
120
121	pwr->regmap = dev_get_regmap(dev->parent, NULL);
122	pwr->dev = dev;
123	pwr->idev = idev;
124	device_init_wakeup(dev, true);
125
126	irq = platform_get_irq(pdev, 0);
127	if (irq < 0)
128		return -EINVAL;
129
130	error = devm_request_threaded_irq(dev, irq, NULL, tps6521x_pb_irq,
131					  IRQF_TRIGGER_RISING |
132						IRQF_TRIGGER_FALLING |
133						IRQF_ONESHOT,
134					  pwr->data->name, pwr);
135	if (error) {
136		dev_err(dev, "failed to request IRQ #%d: %d\n", irq, error);
137		return error;
138	}
139
140	error= input_register_device(idev);
141	if (error) {
142		dev_err(dev, "Can't register power button: %d\n", error);
143		return error;
144	}
145
146	return 0;
147}
148
149static const struct platform_device_id tps6521x_pwrbtn_id_table[] = {
150	{ "tps65218-pwrbutton", },
151	{ "tps65217-pwrbutton", },
152	{ /* sentinel */ }
153};
154MODULE_DEVICE_TABLE(platform, tps6521x_pwrbtn_id_table);
155
156static struct platform_driver tps6521x_pb_driver = {
157	.probe	= tps6521x_pb_probe,
158	.driver	= {
159		.name	= "tps6521x_pwrbutton",
160		.of_match_table = of_tps6521x_pb_match,
161	},
162	.id_table = tps6521x_pwrbtn_id_table,
163};
164module_platform_driver(tps6521x_pb_driver);
165
166MODULE_DESCRIPTION("TPS6521X Power Button");
167MODULE_LICENSE("GPL v2");
168MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
169