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 
hi65xx_power_press_isr(int irq,void * q)29 static 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 
hi65xx_power_release_isr(int irq,void * q)40 static 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 
hi65xx_restart_toggle_isr(int irq,void * q)51 static 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 
63 static 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 
hi65xx_powerkey_probe(struct platform_device * pdev)72 static 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(dev);
79 	if (!input) {
80 		dev_err(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 			return irq;
95 
96 		error = devm_request_any_context_irq(dev, irq,
97 						     hi65xx_irq_info[i].handler,
98 						     IRQF_ONESHOT,
99 						     hi65xx_irq_info[i].name,
100 						     input);
101 		if (error < 0) {
102 			dev_err(dev, "couldn't request irq %s: %d\n",
103 				hi65xx_irq_info[i].name, error);
104 			return error;
105 		}
106 	}
107 
108 	error = input_register_device(input);
109 	if (error) {
110 		dev_err(dev, "failed to register input device: %d\n", error);
111 		return error;
112 	}
113 
114 	device_init_wakeup(dev, 1);
115 
116 	return 0;
117 }
118 
119 static struct platform_driver hi65xx_powerkey_driver = {
120 	.driver = {
121 		.name = "hi65xx-powerkey",
122 	},
123 	.probe = hi65xx_powerkey_probe,
124 };
125 module_platform_driver(hi65xx_powerkey_driver);
126 
127 MODULE_AUTHOR("Zhiliang Xue <xuezhiliang@huawei.com");
128 MODULE_DESCRIPTION("Hisi PMIC Power key driver");
129 MODULE_LICENSE("GPL v2");
130