GNU Linux-libre 4.14.266-gnu1
[releases.git] / drivers / input / misc / cpcap-pwrbutton.c
1 /**
2  * CPCAP Power Button Input Driver
3  *
4  * Copyright (C) 2017 Sebastian Reichel <sre@kernel.org>
5  *
6  * This file is subject to the terms and conditions of the GNU General
7  * Public License. See the file "COPYING" in the main directory of this
8  * archive for more details.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  */
15
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/kernel.h>
19 #include <linux/errno.h>
20 #include <linux/input.h>
21 #include <linux/interrupt.h>
22 #include <linux/regmap.h>
23 #include <linux/of.h>
24 #include <linux/platform_device.h>
25 #include <linux/mfd/motorola-cpcap.h>
26
27 #define CPCAP_IRQ_ON 23
28 #define CPCAP_IRQ_ON_BITMASK (1 << (CPCAP_IRQ_ON % 16))
29
30 struct cpcap_power_button {
31         struct regmap *regmap;
32         struct input_dev *idev;
33         struct device *dev;
34 };
35
36 static irqreturn_t powerbutton_irq(int irq, void *_button)
37 {
38         struct cpcap_power_button *button = _button;
39         int val;
40
41         val = cpcap_sense_virq(button->regmap, irq);
42         if (val < 0) {
43                 dev_err(button->dev, "irq read failed: %d", val);
44                 return IRQ_HANDLED;
45         }
46
47         pm_wakeup_event(button->dev, 0);
48         input_report_key(button->idev, KEY_POWER, val);
49         input_sync(button->idev);
50
51         return IRQ_HANDLED;
52 }
53
54 static int cpcap_power_button_probe(struct platform_device *pdev)
55 {
56         struct cpcap_power_button *button;
57         int irq = platform_get_irq(pdev, 0);
58         int err;
59
60         button = devm_kmalloc(&pdev->dev, sizeof(*button), GFP_KERNEL);
61         if (!button)
62                 return -ENOMEM;
63
64         button->idev = devm_input_allocate_device(&pdev->dev);
65         if (!button->idev)
66                 return -ENOMEM;
67
68         button->regmap = dev_get_regmap(pdev->dev.parent, NULL);
69         if (!button->regmap)
70                 return -ENODEV;
71
72         button->dev = &pdev->dev;
73
74         button->idev->name = "cpcap-pwrbutton";
75         button->idev->phys = "cpcap-pwrbutton/input0";
76         button->idev->dev.parent = button->dev;
77         input_set_capability(button->idev, EV_KEY, KEY_POWER);
78
79         err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
80                 powerbutton_irq, IRQF_ONESHOT, "cpcap_pwrbutton", button);
81         if (err < 0) {
82                 dev_err(&pdev->dev, "IRQ request failed: %d\n", err);
83                 return err;
84         }
85
86         err = input_register_device(button->idev);
87         if (err) {
88                 dev_err(&pdev->dev, "Input register failed: %d\n", err);
89                 return err;
90         }
91
92         device_init_wakeup(&pdev->dev, true);
93
94         return 0;
95 }
96
97 #ifdef CONFIG_OF
98 static const struct of_device_id cpcap_pwrbutton_dt_match_table[] = {
99         { .compatible = "motorola,cpcap-pwrbutton" },
100         {},
101 };
102 MODULE_DEVICE_TABLE(of, cpcap_pwrbutton_dt_match_table);
103 #endif
104
105 static struct platform_driver cpcap_power_button_driver = {
106         .probe          = cpcap_power_button_probe,
107         .driver         = {
108                 .name   = "cpcap-pwrbutton",
109                 .of_match_table = of_match_ptr(cpcap_pwrbutton_dt_match_table),
110         },
111 };
112 module_platform_driver(cpcap_power_button_driver);
113
114 MODULE_ALIAS("platform:cpcap-pwrbutton");
115 MODULE_DESCRIPTION("CPCAP Power Button");
116 MODULE_LICENSE("GPL");
117 MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");