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