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 | |
29 | static irqreturn_t hi65xx_power_press_isr(int irq, void *q) |
30 | { |
31 | struct input_dev *input = q; |
32 | |
33 | pm_wakeup_event(dev: input->dev.parent, MAX_HELD_TIME); |
34 | input_report_key(dev: input, KEY_POWER, value: 1); |
35 | input_sync(dev: input); |
36 | |
37 | return IRQ_HANDLED; |
38 | } |
39 | |
40 | static irqreturn_t hi65xx_power_release_isr(int irq, void *q) |
41 | { |
42 | struct input_dev *input = q; |
43 | |
44 | pm_wakeup_event(dev: input->dev.parent, MAX_HELD_TIME); |
45 | input_report_key(dev: input, KEY_POWER, value: 0); |
46 | input_sync(dev: input); |
47 | |
48 | return IRQ_HANDLED; |
49 | } |
50 | |
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(dev: input->dev.parent, MAX_HELD_TIME); |
57 | input_report_key(dev: input, KEY_RESTART, value: !value); |
58 | input_sync(dev: 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 | |
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(dev: input, EV_KEY, KEY_POWER); |
88 | input_set_capability(dev: 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 | handler: hi65xx_irq_info[i].handler, |
98 | IRQF_ONESHOT, |
99 | devname: hi65xx_irq_info[i].name, |
100 | dev_id: 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, enable: 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 | |