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1 | /* |
2 | * Texas Instruments' TPS65218 Power Button Input Driver | |
3 | * | |
4 | * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/ | |
5 | * Author: Felipe Balbi <balbi@ti.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any | |
12 | * kind, whether express or implied; without even the implied warranty | |
13 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | */ | |
16 | ||
17 | #include <linux/init.h> | |
18 | #include <linux/input.h> | |
19 | #include <linux/interrupt.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/mfd/tps65218.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/of.h> | |
24 | #include <linux/platform_device.h> | |
25 | #include <linux/slab.h> | |
26 | ||
27 | struct tps65218_pwrbutton { | |
28 | struct device *dev; | |
29 | struct tps65218 *tps; | |
30 | struct input_dev *idev; | |
31 | }; | |
32 | ||
33 | static irqreturn_t tps65218_pwr_irq(int irq, void *_pwr) | |
34 | { | |
35 | struct tps65218_pwrbutton *pwr = _pwr; | |
36 | unsigned int reg; | |
37 | int error; | |
38 | ||
39 | error = tps65218_reg_read(pwr->tps, TPS65218_REG_STATUS, ®); | |
40 | if (error) { | |
41 | dev_err(pwr->dev, "can't read register: %d\n", error); | |
42 | goto out; | |
43 | } | |
44 | ||
45 | if (reg & TPS65218_STATUS_PB_STATE) { | |
46 | input_report_key(pwr->idev, KEY_POWER, 1); | |
47 | pm_wakeup_event(pwr->dev, 0); | |
48 | } else { | |
49 | input_report_key(pwr->idev, KEY_POWER, 0); | |
50 | } | |
51 | ||
52 | input_sync(pwr->idev); | |
53 | ||
54 | out: | |
55 | return IRQ_HANDLED; | |
56 | } | |
57 | ||
58 | static int tps65218_pwron_probe(struct platform_device *pdev) | |
59 | { | |
60 | struct tps65218 *tps = dev_get_drvdata(pdev->dev.parent); | |
61 | struct device *dev = &pdev->dev; | |
62 | struct tps65218_pwrbutton *pwr; | |
63 | struct input_dev *idev; | |
64 | int error; | |
65 | int irq; | |
66 | ||
67 | pwr = devm_kzalloc(dev, sizeof(*pwr), GFP_KERNEL); | |
68 | if (!pwr) | |
69 | return -ENOMEM; | |
70 | ||
71 | idev = devm_input_allocate_device(dev); | |
72 | if (!idev) | |
73 | return -ENOMEM; | |
74 | ||
75 | idev->name = "tps65218_pwrbutton"; | |
76 | idev->phys = "tps65218_pwrbutton/input0"; | |
77 | idev->dev.parent = dev; | |
78 | idev->id.bustype = BUS_I2C; | |
79 | ||
80 | input_set_capability(idev, EV_KEY, KEY_POWER); | |
81 | ||
82 | pwr->tps = tps; | |
83 | pwr->dev = dev; | |
84 | pwr->idev = idev; | |
85 | platform_set_drvdata(pdev, pwr); | |
86 | device_init_wakeup(dev, true); | |
87 | ||
88 | irq = platform_get_irq(pdev, 0); | |
89 | error = devm_request_threaded_irq(dev, irq, NULL, tps65218_pwr_irq, | |
90 | IRQF_TRIGGER_RISING | | |
91 | IRQF_TRIGGER_FALLING | | |
92 | IRQF_ONESHOT, | |
93 | "tps65218-pwrbutton", pwr); | |
94 | if (error) { | |
95 | dev_err(dev, "failed to request IRQ #%d: %d\n", | |
96 | irq, error); | |
97 | return error; | |
98 | } | |
99 | ||
100 | error= input_register_device(idev); | |
101 | if (error) { | |
102 | dev_err(dev, "Can't register power button: %d\n", error); | |
103 | return error; | |
104 | } | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
245165de | 109 | static const struct of_device_id of_tps65218_pwr_match[] = { |
5fafed3e FB |
110 | { .compatible = "ti,tps65218-pwrbutton" }, |
111 | { }, | |
112 | }; | |
113 | MODULE_DEVICE_TABLE(of, of_tps65218_pwr_match); | |
114 | ||
115 | static struct platform_driver tps65218_pwron_driver = { | |
116 | .probe = tps65218_pwron_probe, | |
117 | .driver = { | |
118 | .name = "tps65218_pwrbutton", | |
119 | .of_match_table = of_tps65218_pwr_match, | |
120 | }, | |
121 | }; | |
122 | module_platform_driver(tps65218_pwron_driver); | |
123 | ||
124 | MODULE_DESCRIPTION("TPS65218 Power Button"); | |
125 | MODULE_LICENSE("GPL v2"); | |
126 | MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>"); |