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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
f0c5f65b AJ |
2 | /* |
3 | * ON pin driver for Dialog DA9052 PMICs | |
4 | * | |
5 | * Copyright(c) 2012 Dialog Semiconductor Ltd. | |
6 | * | |
7 | * Author: David Dajun Chen <dchen@diasemi.com> | |
f0c5f65b AJ |
8 | */ |
9 | ||
f0c5f65b AJ |
10 | #include <linux/input.h> |
11 | #include <linux/module.h> | |
12 | #include <linux/platform_device.h> | |
13 | #include <linux/workqueue.h> | |
14 | ||
15 | #include <linux/mfd/da9052/da9052.h> | |
16 | #include <linux/mfd/da9052/reg.h> | |
17 | ||
18 | struct da9052_onkey { | |
19 | struct da9052 *da9052; | |
20 | struct input_dev *input; | |
21 | struct delayed_work work; | |
f0c5f65b AJ |
22 | }; |
23 | ||
24 | static void da9052_onkey_query(struct da9052_onkey *onkey) | |
25 | { | |
70b00524 | 26 | int ret; |
f0c5f65b | 27 | |
70b00524 AO |
28 | ret = da9052_reg_read(onkey->da9052, DA9052_STATUS_A_REG); |
29 | if (ret < 0) { | |
f0c5f65b | 30 | dev_err(onkey->da9052->dev, |
70b00524 | 31 | "Failed to read onkey event err=%d\n", ret); |
f0c5f65b AJ |
32 | } else { |
33 | /* | |
34 | * Since interrupt for deassertion of ONKEY pin is not | |
35 | * generated, onkey event state determines the onkey | |
36 | * button state. | |
37 | */ | |
70b00524 AO |
38 | bool pressed = !(ret & DA9052_STATUSA_NONKEY); |
39 | ||
40 | input_report_key(onkey->input, KEY_POWER, pressed); | |
f0c5f65b | 41 | input_sync(onkey->input); |
f0c5f65b | 42 | |
70b00524 AO |
43 | /* |
44 | * Interrupt is generated only when the ONKEY pin | |
45 | * is asserted. Hence the deassertion of the pin | |
46 | * is simulated through work queue. | |
47 | */ | |
48 | if (pressed) | |
49 | schedule_delayed_work(&onkey->work, | |
50 | msecs_to_jiffies(50)); | |
51 | } | |
f0c5f65b AJ |
52 | } |
53 | ||
54 | static void da9052_onkey_work(struct work_struct *work) | |
55 | { | |
56 | struct da9052_onkey *onkey = container_of(work, struct da9052_onkey, | |
57 | work.work); | |
58 | ||
59 | da9052_onkey_query(onkey); | |
60 | } | |
61 | ||
62 | static irqreturn_t da9052_onkey_irq(int irq, void *data) | |
63 | { | |
64 | struct da9052_onkey *onkey = data; | |
65 | ||
66 | da9052_onkey_query(onkey); | |
67 | ||
68 | return IRQ_HANDLED; | |
69 | } | |
70 | ||
5298cc4c | 71 | static int da9052_onkey_probe(struct platform_device *pdev) |
f0c5f65b AJ |
72 | { |
73 | struct da9052 *da9052 = dev_get_drvdata(pdev->dev.parent); | |
74 | struct da9052_onkey *onkey; | |
75 | struct input_dev *input_dev; | |
f0c5f65b AJ |
76 | int error; |
77 | ||
78 | if (!da9052) { | |
79 | dev_err(&pdev->dev, "Failed to get the driver's data\n"); | |
80 | return -EINVAL; | |
81 | } | |
82 | ||
f0c5f65b AJ |
83 | onkey = kzalloc(sizeof(*onkey), GFP_KERNEL); |
84 | input_dev = input_allocate_device(); | |
85 | if (!onkey || !input_dev) { | |
86 | dev_err(&pdev->dev, "Failed to allocate memory\n"); | |
0e3d0f3d JJ |
87 | error = -ENOMEM; |
88 | goto err_free_mem; | |
f0c5f65b AJ |
89 | } |
90 | ||
91 | onkey->input = input_dev; | |
92 | onkey->da9052 = da9052; | |
f0c5f65b AJ |
93 | INIT_DELAYED_WORK(&onkey->work, da9052_onkey_work); |
94 | ||
95 | input_dev->name = "da9052-onkey"; | |
96 | input_dev->phys = "da9052-onkey/input0"; | |
97 | input_dev->dev.parent = &pdev->dev; | |
98 | ||
99 | input_dev->evbit[0] = BIT_MASK(EV_KEY); | |
100 | __set_bit(KEY_POWER, input_dev->keybit); | |
101 | ||
21eed07d FE |
102 | error = da9052_request_irq(onkey->da9052, DA9052_IRQ_NONKEY, "ONKEY", |
103 | da9052_onkey_irq, onkey); | |
f0c5f65b AJ |
104 | if (error < 0) { |
105 | dev_err(onkey->da9052->dev, | |
21eed07d | 106 | "Failed to register ONKEY IRQ: %d\n", error); |
f0c5f65b AJ |
107 | goto err_free_mem; |
108 | } | |
109 | ||
110 | error = input_register_device(onkey->input); | |
111 | if (error) { | |
112 | dev_err(&pdev->dev, "Unable to register input device, %d\n", | |
113 | error); | |
114 | goto err_free_irq; | |
115 | } | |
116 | ||
117 | platform_set_drvdata(pdev, onkey); | |
118 | return 0; | |
119 | ||
120 | err_free_irq: | |
21eed07d | 121 | da9052_free_irq(onkey->da9052, DA9052_IRQ_NONKEY, onkey); |
f0c5f65b AJ |
122 | cancel_delayed_work_sync(&onkey->work); |
123 | err_free_mem: | |
124 | input_free_device(input_dev); | |
125 | kfree(onkey); | |
126 | ||
127 | return error; | |
128 | } | |
129 | ||
e2619cf7 | 130 | static int da9052_onkey_remove(struct platform_device *pdev) |
f0c5f65b AJ |
131 | { |
132 | struct da9052_onkey *onkey = platform_get_drvdata(pdev); | |
133 | ||
21eed07d | 134 | da9052_free_irq(onkey->da9052, DA9052_IRQ_NONKEY, onkey); |
f0c5f65b AJ |
135 | cancel_delayed_work_sync(&onkey->work); |
136 | ||
137 | input_unregister_device(onkey->input); | |
138 | kfree(onkey); | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
143 | static struct platform_driver da9052_onkey_driver = { | |
144 | .probe = da9052_onkey_probe, | |
1cb0aa88 | 145 | .remove = da9052_onkey_remove, |
f0c5f65b AJ |
146 | .driver = { |
147 | .name = "da9052-onkey", | |
f0c5f65b AJ |
148 | }, |
149 | }; | |
150 | module_platform_driver(da9052_onkey_driver); | |
151 | ||
152 | MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); | |
153 | MODULE_DESCRIPTION("Onkey driver for DA9052"); | |
154 | MODULE_LICENSE("GPL"); | |
155 | MODULE_ALIAS("platform:da9052-onkey"); |