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f0c5f65b AJ |
1 | /* |
2 | * ON pin driver for Dialog DA9052 PMICs | |
3 | * | |
4 | * Copyright(c) 2012 Dialog Semiconductor Ltd. | |
5 | * | |
6 | * Author: David Dajun Chen <dchen@diasemi.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2 of the License, or (at your | |
11 | * option) any later version. | |
12 | */ | |
13 | ||
14 | #include <linux/init.h> | |
15 | #include <linux/input.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/workqueue.h> | |
19 | ||
20 | #include <linux/mfd/da9052/da9052.h> | |
21 | #include <linux/mfd/da9052/reg.h> | |
22 | ||
23 | struct da9052_onkey { | |
24 | struct da9052 *da9052; | |
25 | struct input_dev *input; | |
26 | struct delayed_work work; | |
f0c5f65b AJ |
27 | }; |
28 | ||
29 | static void da9052_onkey_query(struct da9052_onkey *onkey) | |
30 | { | |
31 | int key_stat; | |
32 | ||
33 | key_stat = da9052_reg_read(onkey->da9052, DA9052_EVENT_B_REG); | |
34 | if (key_stat < 0) { | |
35 | dev_err(onkey->da9052->dev, | |
36 | "Failed to read onkey event %d\n", key_stat); | |
37 | } else { | |
38 | /* | |
39 | * Since interrupt for deassertion of ONKEY pin is not | |
40 | * generated, onkey event state determines the onkey | |
41 | * button state. | |
42 | */ | |
43 | key_stat &= DA9052_EVENTB_ENONKEY; | |
44 | input_report_key(onkey->input, KEY_POWER, key_stat); | |
45 | input_sync(onkey->input); | |
46 | } | |
47 | ||
48 | /* | |
49 | * Interrupt is generated only when the ONKEY pin is asserted. | |
50 | * Hence the deassertion of the pin is simulated through work queue. | |
51 | */ | |
52 | if (key_stat) | |
53 | schedule_delayed_work(&onkey->work, msecs_to_jiffies(50)); | |
54 | } | |
55 | ||
56 | static void da9052_onkey_work(struct work_struct *work) | |
57 | { | |
58 | struct da9052_onkey *onkey = container_of(work, struct da9052_onkey, | |
59 | work.work); | |
60 | ||
61 | da9052_onkey_query(onkey); | |
62 | } | |
63 | ||
64 | static irqreturn_t da9052_onkey_irq(int irq, void *data) | |
65 | { | |
66 | struct da9052_onkey *onkey = data; | |
67 | ||
68 | da9052_onkey_query(onkey); | |
69 | ||
70 | return IRQ_HANDLED; | |
71 | } | |
72 | ||
5298cc4c | 73 | static int da9052_onkey_probe(struct platform_device *pdev) |
f0c5f65b AJ |
74 | { |
75 | struct da9052 *da9052 = dev_get_drvdata(pdev->dev.parent); | |
76 | struct da9052_onkey *onkey; | |
77 | struct input_dev *input_dev; | |
f0c5f65b AJ |
78 | int error; |
79 | ||
80 | if (!da9052) { | |
81 | dev_err(&pdev->dev, "Failed to get the driver's data\n"); | |
82 | return -EINVAL; | |
83 | } | |
84 | ||
f0c5f65b AJ |
85 | onkey = kzalloc(sizeof(*onkey), GFP_KERNEL); |
86 | input_dev = input_allocate_device(); | |
87 | if (!onkey || !input_dev) { | |
88 | dev_err(&pdev->dev, "Failed to allocate memory\n"); | |
0e3d0f3d JJ |
89 | error = -ENOMEM; |
90 | goto err_free_mem; | |
f0c5f65b AJ |
91 | } |
92 | ||
93 | onkey->input = input_dev; | |
94 | onkey->da9052 = da9052; | |
f0c5f65b AJ |
95 | INIT_DELAYED_WORK(&onkey->work, da9052_onkey_work); |
96 | ||
97 | input_dev->name = "da9052-onkey"; | |
98 | input_dev->phys = "da9052-onkey/input0"; | |
99 | input_dev->dev.parent = &pdev->dev; | |
100 | ||
101 | input_dev->evbit[0] = BIT_MASK(EV_KEY); | |
102 | __set_bit(KEY_POWER, input_dev->keybit); | |
103 | ||
21eed07d FE |
104 | error = da9052_request_irq(onkey->da9052, DA9052_IRQ_NONKEY, "ONKEY", |
105 | da9052_onkey_irq, onkey); | |
f0c5f65b AJ |
106 | if (error < 0) { |
107 | dev_err(onkey->da9052->dev, | |
21eed07d | 108 | "Failed to register ONKEY IRQ: %d\n", error); |
f0c5f65b AJ |
109 | goto err_free_mem; |
110 | } | |
111 | ||
112 | error = input_register_device(onkey->input); | |
113 | if (error) { | |
114 | dev_err(&pdev->dev, "Unable to register input device, %d\n", | |
115 | error); | |
116 | goto err_free_irq; | |
117 | } | |
118 | ||
119 | platform_set_drvdata(pdev, onkey); | |
120 | return 0; | |
121 | ||
122 | err_free_irq: | |
21eed07d | 123 | da9052_free_irq(onkey->da9052, DA9052_IRQ_NONKEY, onkey); |
f0c5f65b AJ |
124 | cancel_delayed_work_sync(&onkey->work); |
125 | err_free_mem: | |
126 | input_free_device(input_dev); | |
127 | kfree(onkey); | |
128 | ||
129 | return error; | |
130 | } | |
131 | ||
e2619cf7 | 132 | static int da9052_onkey_remove(struct platform_device *pdev) |
f0c5f65b AJ |
133 | { |
134 | struct da9052_onkey *onkey = platform_get_drvdata(pdev); | |
135 | ||
21eed07d | 136 | da9052_free_irq(onkey->da9052, DA9052_IRQ_NONKEY, onkey); |
f0c5f65b AJ |
137 | cancel_delayed_work_sync(&onkey->work); |
138 | ||
139 | input_unregister_device(onkey->input); | |
140 | kfree(onkey); | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
145 | static struct platform_driver da9052_onkey_driver = { | |
146 | .probe = da9052_onkey_probe, | |
1cb0aa88 | 147 | .remove = da9052_onkey_remove, |
f0c5f65b AJ |
148 | .driver = { |
149 | .name = "da9052-onkey", | |
150 | .owner = THIS_MODULE, | |
151 | }, | |
152 | }; | |
153 | module_platform_driver(da9052_onkey_driver); | |
154 | ||
155 | MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); | |
156 | MODULE_DESCRIPTION("Onkey driver for DA9052"); | |
157 | MODULE_LICENSE("GPL"); | |
158 | MODULE_ALIAS("platform:da9052-onkey"); |