1*4882a593Smuzhiyun /**
2*4882a593Smuzhiyun * CPCAP Power Button Input Driver
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Copyright (C) 2017 Sebastian Reichel <sre@kernel.org>
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * This file is subject to the terms and conditions of the GNU General
7*4882a593Smuzhiyun * Public License. See the file "COPYING" in the main directory of this
8*4882a593Smuzhiyun * archive for more details.
9*4882a593Smuzhiyun *
10*4882a593Smuzhiyun * This program is distributed in the hope that it will be useful,
11*4882a593Smuzhiyun * but WITHOUT ANY WARRANTY; without even the implied warranty of
12*4882a593Smuzhiyun * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13*4882a593Smuzhiyun * GNU General Public License for more details.
14*4882a593Smuzhiyun */
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #include <linux/module.h>
17*4882a593Smuzhiyun #include <linux/init.h>
18*4882a593Smuzhiyun #include <linux/kernel.h>
19*4882a593Smuzhiyun #include <linux/errno.h>
20*4882a593Smuzhiyun #include <linux/input.h>
21*4882a593Smuzhiyun #include <linux/interrupt.h>
22*4882a593Smuzhiyun #include <linux/regmap.h>
23*4882a593Smuzhiyun #include <linux/of.h>
24*4882a593Smuzhiyun #include <linux/platform_device.h>
25*4882a593Smuzhiyun #include <linux/mfd/motorola-cpcap.h>
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun #define CPCAP_IRQ_ON 23
28*4882a593Smuzhiyun #define CPCAP_IRQ_ON_BITMASK (1 << (CPCAP_IRQ_ON % 16))
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun struct cpcap_power_button {
31*4882a593Smuzhiyun struct regmap *regmap;
32*4882a593Smuzhiyun struct input_dev *idev;
33*4882a593Smuzhiyun struct device *dev;
34*4882a593Smuzhiyun };
35*4882a593Smuzhiyun
powerbutton_irq(int irq,void * _button)36*4882a593Smuzhiyun static irqreturn_t powerbutton_irq(int irq, void *_button)
37*4882a593Smuzhiyun {
38*4882a593Smuzhiyun struct cpcap_power_button *button = _button;
39*4882a593Smuzhiyun int val;
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun val = cpcap_sense_virq(button->regmap, irq);
42*4882a593Smuzhiyun if (val < 0) {
43*4882a593Smuzhiyun dev_err(button->dev, "irq read failed: %d", val);
44*4882a593Smuzhiyun return IRQ_HANDLED;
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun pm_wakeup_event(button->dev, 0);
48*4882a593Smuzhiyun input_report_key(button->idev, KEY_POWER, val);
49*4882a593Smuzhiyun input_sync(button->idev);
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun return IRQ_HANDLED;
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun
cpcap_power_button_probe(struct platform_device * pdev)54*4882a593Smuzhiyun static int cpcap_power_button_probe(struct platform_device *pdev)
55*4882a593Smuzhiyun {
56*4882a593Smuzhiyun struct cpcap_power_button *button;
57*4882a593Smuzhiyun int irq = platform_get_irq(pdev, 0);
58*4882a593Smuzhiyun int err;
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun button = devm_kmalloc(&pdev->dev, sizeof(*button), GFP_KERNEL);
61*4882a593Smuzhiyun if (!button)
62*4882a593Smuzhiyun return -ENOMEM;
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun button->idev = devm_input_allocate_device(&pdev->dev);
65*4882a593Smuzhiyun if (!button->idev)
66*4882a593Smuzhiyun return -ENOMEM;
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun button->regmap = dev_get_regmap(pdev->dev.parent, NULL);
69*4882a593Smuzhiyun if (!button->regmap)
70*4882a593Smuzhiyun return -ENODEV;
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun button->dev = &pdev->dev;
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun button->idev->name = "cpcap-pwrbutton";
75*4882a593Smuzhiyun button->idev->phys = "cpcap-pwrbutton/input0";
76*4882a593Smuzhiyun button->idev->dev.parent = button->dev;
77*4882a593Smuzhiyun input_set_capability(button->idev, EV_KEY, KEY_POWER);
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
80*4882a593Smuzhiyun powerbutton_irq, IRQF_ONESHOT, "cpcap_pwrbutton", button);
81*4882a593Smuzhiyun if (err < 0) {
82*4882a593Smuzhiyun dev_err(&pdev->dev, "IRQ request failed: %d\n", err);
83*4882a593Smuzhiyun return err;
84*4882a593Smuzhiyun }
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun err = input_register_device(button->idev);
87*4882a593Smuzhiyun if (err) {
88*4882a593Smuzhiyun dev_err(&pdev->dev, "Input register failed: %d\n", err);
89*4882a593Smuzhiyun return err;
90*4882a593Smuzhiyun }
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun device_init_wakeup(&pdev->dev, true);
93*4882a593Smuzhiyun
94*4882a593Smuzhiyun return 0;
95*4882a593Smuzhiyun }
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun #ifdef CONFIG_OF
98*4882a593Smuzhiyun static const struct of_device_id cpcap_pwrbutton_dt_match_table[] = {
99*4882a593Smuzhiyun { .compatible = "motorola,cpcap-pwrbutton" },
100*4882a593Smuzhiyun {},
101*4882a593Smuzhiyun };
102*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, cpcap_pwrbutton_dt_match_table);
103*4882a593Smuzhiyun #endif
104*4882a593Smuzhiyun
105*4882a593Smuzhiyun static struct platform_driver cpcap_power_button_driver = {
106*4882a593Smuzhiyun .probe = cpcap_power_button_probe,
107*4882a593Smuzhiyun .driver = {
108*4882a593Smuzhiyun .name = "cpcap-pwrbutton",
109*4882a593Smuzhiyun .of_match_table = of_match_ptr(cpcap_pwrbutton_dt_match_table),
110*4882a593Smuzhiyun },
111*4882a593Smuzhiyun };
112*4882a593Smuzhiyun module_platform_driver(cpcap_power_button_driver);
113*4882a593Smuzhiyun
114*4882a593Smuzhiyun MODULE_ALIAS("platform:cpcap-pwrbutton");
115*4882a593Smuzhiyun MODULE_DESCRIPTION("CPCAP Power Button");
116*4882a593Smuzhiyun MODULE_LICENSE("GPL");
117*4882a593Smuzhiyun MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");
118