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