1/*
  2 * Hisilicon PMIC powerkey driver
  3 *
  4 * Copyright (C) 2013 Hisilicon Ltd.
  5 * Copyright (C) 2015, 2016 Linaro Ltd.
  6 *
  7 * This file is subject to the terms and conditions of the GNU General
  8 * Public License. See the file "COPYING" in the main directory of this
  9 * archive for more details.
 10 *
 11 * This program is distributed in the hope that it will be useful,
 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14 * GNU General Public License for more details.
 15 */
 16
 17#include <linux/platform_device.h>
 18#include <linux/interrupt.h>
 19#include <linux/reboot.h>
 20#include <linux/kernel.h>
 21#include <linux/module.h>
 22#include <linux/of_irq.h>
 23#include <linux/input.h>
 24#include <linux/slab.h>
 25
 26/* the held interrupt will trigger after 4 seconds */
 27#define MAX_HELD_TIME	(4 * MSEC_PER_SEC)
 28
 29static irqreturn_t hi65xx_power_press_isr(int irq, void *q)
 30{
 31	struct input_dev *input = q;
 32
 33	pm_wakeup_event(input->dev.parent, MAX_HELD_TIME);
 34	input_report_key(input, KEY_POWER, 1);
 35	input_sync(input);
 36
 37	return IRQ_HANDLED;
 38}
 39
 40static irqreturn_t hi65xx_power_release_isr(int irq, void *q)
 41{
 42	struct input_dev *input = q;
 43
 44	pm_wakeup_event(input->dev.parent, MAX_HELD_TIME);
 45	input_report_key(input, KEY_POWER, 0);
 46	input_sync(input);
 47
 48	return IRQ_HANDLED;
 49}
 50
 51static irqreturn_t hi65xx_restart_toggle_isr(int irq, void *q)
 52{
 53	struct input_dev *input = q;
 54	int value = test_bit(KEY_RESTART, input->key);
 55
 56	pm_wakeup_event(input->dev.parent, MAX_HELD_TIME);
 57	input_report_key(input, KEY_RESTART, !value);
 58	input_sync(input);
 59
 60	return IRQ_HANDLED;
 61}
 62
 63static const struct {
 64	const char *name;
 65	irqreturn_t (*handler)(int irq, void *q);
 66} hi65xx_irq_info[] = {
 67	{ "down", hi65xx_power_press_isr },
 68	{ "up", hi65xx_power_release_isr },
 69	{ "hold 4s", hi65xx_restart_toggle_isr },
 70};
 71
 72static int hi65xx_powerkey_probe(struct platform_device *pdev)
 73{
 74	struct device *dev = &pdev->dev;
 75	struct input_dev *input;
 76	int irq, i, error;
 77
 78	input = devm_input_allocate_device(&pdev->dev);
 79	if (!input) {
 80		dev_err(&pdev->dev, "failed to allocate input device\n");
 81		return -ENOMEM;
 82	}
 83
 84	input->phys = "hisi_on/input0";
 85	input->name = "HISI 65xx PowerOn Key";
 86
 87	input_set_capability(input, EV_KEY, KEY_POWER);
 88	input_set_capability(input, EV_KEY, KEY_RESTART);
 89
 90	for (i = 0; i < ARRAY_SIZE(hi65xx_irq_info); i++) {
 91
 92		irq = platform_get_irq_byname(pdev, hi65xx_irq_info[i].name);
 93		if (irq < 0) {
 94			error = irq;
 95			dev_err(dev, "couldn't get irq %s: %d\n",
 96				hi65xx_irq_info[i].name, error);
 97			return error;
 98		}
 99
100		error = devm_request_any_context_irq(dev, irq,
101						     hi65xx_irq_info[i].handler,
102						     IRQF_ONESHOT,
103						     hi65xx_irq_info[i].name,
104						     input);
105		if (error < 0) {
106			dev_err(dev, "couldn't request irq %s: %d\n",
107				hi65xx_irq_info[i].name, error);
108			return error;
109		}
110	}
111
112	error = input_register_device(input);
113	if (error) {
114		dev_err(&pdev->dev, "failed to register input device: %d\n",
115			error);
116		return error;
117	}
118
119	device_init_wakeup(&pdev->dev, 1);
120
121	return 0;
122}
123
124static int hi65xx_powerkey_remove(struct platform_device *pdev)
125{
126	device_init_wakeup(&pdev->dev, 0);
127
128	return 0;
129}
130
131static struct platform_driver hi65xx_powerkey_driver = {
132	.driver = {
133		.name = "hi65xx-powerkey",
134	},
135	.probe = hi65xx_powerkey_probe,
136	.remove  = hi65xx_powerkey_remove,
137};
138module_platform_driver(hi65xx_powerkey_driver);
139
140MODULE_AUTHOR("Zhiliang Xue <xuezhiliang@huawei.com");
141MODULE_DESCRIPTION("Hisi PMIC Power key driver");
142MODULE_LICENSE("GPL v2");