1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Marvell 88PM80x ONKEY driver
4 *
5 * Copyright (C) 2012 Marvell International Ltd.
6 * Haojian Zhuang <haojian.zhuang@marvell.com>
7 * Qiao Zhou <zhouqiao@marvell.com>
8 */
9
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/input.h>
13 #include <linux/mfd/88pm80x.h>
14 #include <linux/regmap.h>
15 #include <linux/slab.h>
16
17 #define PM800_LONG_ONKEY_EN (1 << 0)
18 #define PM800_LONG_KEY_DELAY (8) /* 1 .. 16 seconds */
19 #define PM800_LONKEY_PRESS_TIME ((PM800_LONG_KEY_DELAY-1) << 4)
20 #define PM800_LONKEY_PRESS_TIME_MASK (0xF0)
21 #define PM800_SW_PDOWN (1 << 5)
22
23 struct pm80x_onkey_info {
24 struct input_dev *idev;
25 struct pm80x_chip *pm80x;
26 struct regmap *map;
27 int irq;
28 };
29
30 /* 88PM80x gives us an interrupt when ONKEY is held */
pm80x_onkey_handler(int irq,void * data)31 static irqreturn_t pm80x_onkey_handler(int irq, void *data)
32 {
33 struct pm80x_onkey_info *info = data;
34 int ret = 0;
35 unsigned int val;
36
37 ret = regmap_read(info->map, PM800_STATUS_1, &val);
38 if (ret < 0) {
39 dev_err(info->idev->dev.parent, "failed to read status: %d\n", ret);
40 return IRQ_NONE;
41 }
42 val &= PM800_ONKEY_STS1;
43
44 input_report_key(info->idev, KEY_POWER, val);
45 input_sync(info->idev);
46
47 return IRQ_HANDLED;
48 }
49
50 static SIMPLE_DEV_PM_OPS(pm80x_onkey_pm_ops, pm80x_dev_suspend,
51 pm80x_dev_resume);
52
pm80x_onkey_probe(struct platform_device * pdev)53 static int pm80x_onkey_probe(struct platform_device *pdev)
54 {
55
56 struct pm80x_chip *chip = dev_get_drvdata(pdev->dev.parent);
57 struct pm80x_onkey_info *info;
58 int err;
59
60 info = kzalloc(sizeof(*info), GFP_KERNEL);
61 if (!info)
62 return -ENOMEM;
63
64 info->pm80x = chip;
65
66 info->irq = platform_get_irq(pdev, 0);
67 if (info->irq < 0) {
68 err = -EINVAL;
69 goto out;
70 }
71
72 info->map = info->pm80x->regmap;
73 if (!info->map) {
74 dev_err(&pdev->dev, "no regmap!\n");
75 err = -EINVAL;
76 goto out;
77 }
78
79 info->idev = input_allocate_device();
80 if (!info->idev) {
81 dev_err(&pdev->dev, "Failed to allocate input dev\n");
82 err = -ENOMEM;
83 goto out;
84 }
85
86 info->idev->name = "88pm80x_on";
87 info->idev->phys = "88pm80x_on/input0";
88 info->idev->id.bustype = BUS_I2C;
89 info->idev->dev.parent = &pdev->dev;
90 info->idev->evbit[0] = BIT_MASK(EV_KEY);
91 __set_bit(KEY_POWER, info->idev->keybit);
92
93 err = pm80x_request_irq(info->pm80x, info->irq, pm80x_onkey_handler,
94 IRQF_ONESHOT, "onkey", info);
95 if (err < 0) {
96 dev_err(&pdev->dev, "Failed to request IRQ: #%d: %d\n",
97 info->irq, err);
98 goto out_reg;
99 }
100
101 err = input_register_device(info->idev);
102 if (err) {
103 dev_err(&pdev->dev, "Can't register input device: %d\n", err);
104 goto out_irq;
105 }
106
107 platform_set_drvdata(pdev, info);
108
109 /* Enable long onkey detection */
110 regmap_update_bits(info->map, PM800_RTC_MISC4, PM800_LONG_ONKEY_EN,
111 PM800_LONG_ONKEY_EN);
112 /* Set 8-second interval */
113 regmap_update_bits(info->map, PM800_RTC_MISC3,
114 PM800_LONKEY_PRESS_TIME_MASK,
115 PM800_LONKEY_PRESS_TIME);
116
117 device_init_wakeup(&pdev->dev, 1);
118 return 0;
119
120 out_irq:
121 pm80x_free_irq(info->pm80x, info->irq, info);
122 out_reg:
123 input_free_device(info->idev);
124 out:
125 kfree(info);
126 return err;
127 }
128
pm80x_onkey_remove(struct platform_device * pdev)129 static void pm80x_onkey_remove(struct platform_device *pdev)
130 {
131 struct pm80x_onkey_info *info = platform_get_drvdata(pdev);
132
133 pm80x_free_irq(info->pm80x, info->irq, info);
134 input_unregister_device(info->idev);
135 kfree(info);
136 }
137
138 static struct platform_driver pm80x_onkey_driver = {
139 .driver = {
140 .name = "88pm80x-onkey",
141 .pm = &pm80x_onkey_pm_ops,
142 },
143 .probe = pm80x_onkey_probe,
144 .remove_new = pm80x_onkey_remove,
145 };
146
147 module_platform_driver(pm80x_onkey_driver);
148
149 MODULE_LICENSE("GPL");
150 MODULE_DESCRIPTION("Marvell 88PM80x ONKEY driver");
151 MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
152 MODULE_ALIAS("platform:88pm80x-onkey");
153