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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; | |
27 | unsigned int irq; | |
28 | }; | |
29 | ||
30 | static void da9052_onkey_query(struct da9052_onkey *onkey) | |
31 | { | |
32 | int key_stat; | |
33 | ||
34 | key_stat = da9052_reg_read(onkey->da9052, DA9052_EVENT_B_REG); | |
35 | if (key_stat < 0) { | |
36 | dev_err(onkey->da9052->dev, | |
37 | "Failed to read onkey event %d\n", key_stat); | |
38 | } else { | |
39 | /* | |
40 | * Since interrupt for deassertion of ONKEY pin is not | |
41 | * generated, onkey event state determines the onkey | |
42 | * button state. | |
43 | */ | |
44 | key_stat &= DA9052_EVENTB_ENONKEY; | |
45 | input_report_key(onkey->input, KEY_POWER, key_stat); | |
46 | input_sync(onkey->input); | |
47 | } | |
48 | ||
49 | /* | |
50 | * Interrupt is generated only when the ONKEY pin is asserted. | |
51 | * Hence the deassertion of the pin is simulated through work queue. | |
52 | */ | |
53 | if (key_stat) | |
54 | schedule_delayed_work(&onkey->work, msecs_to_jiffies(50)); | |
55 | } | |
56 | ||
57 | static void da9052_onkey_work(struct work_struct *work) | |
58 | { | |
59 | struct da9052_onkey *onkey = container_of(work, struct da9052_onkey, | |
60 | work.work); | |
61 | ||
62 | da9052_onkey_query(onkey); | |
63 | } | |
64 | ||
65 | static irqreturn_t da9052_onkey_irq(int irq, void *data) | |
66 | { | |
67 | struct da9052_onkey *onkey = data; | |
68 | ||
69 | da9052_onkey_query(onkey); | |
70 | ||
71 | return IRQ_HANDLED; | |
72 | } | |
73 | ||
74 | static int __devinit da9052_onkey_probe(struct platform_device *pdev) | |
75 | { | |
76 | struct da9052 *da9052 = dev_get_drvdata(pdev->dev.parent); | |
77 | struct da9052_onkey *onkey; | |
78 | struct input_dev *input_dev; | |
79 | int irq; | |
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 | ||
87 | irq = platform_get_irq_byname(pdev, "ONKEY"); | |
88 | if (irq < 0) { | |
89 | dev_err(&pdev->dev, | |
90 | "Failed to get an IRQ for input device, %d\n", irq); | |
91 | return -EINVAL; | |
92 | } | |
93 | ||
94 | onkey = kzalloc(sizeof(*onkey), GFP_KERNEL); | |
95 | input_dev = input_allocate_device(); | |
96 | if (!onkey || !input_dev) { | |
97 | dev_err(&pdev->dev, "Failed to allocate memory\n"); | |
0e3d0f3d JJ |
98 | error = -ENOMEM; |
99 | goto err_free_mem; | |
f0c5f65b AJ |
100 | } |
101 | ||
102 | onkey->input = input_dev; | |
103 | onkey->da9052 = da9052; | |
104 | onkey->irq = irq; | |
105 | INIT_DELAYED_WORK(&onkey->work, da9052_onkey_work); | |
106 | ||
107 | input_dev->name = "da9052-onkey"; | |
108 | input_dev->phys = "da9052-onkey/input0"; | |
109 | input_dev->dev.parent = &pdev->dev; | |
110 | ||
111 | input_dev->evbit[0] = BIT_MASK(EV_KEY); | |
112 | __set_bit(KEY_POWER, input_dev->keybit); | |
113 | ||
114 | error = request_threaded_irq(onkey->irq, NULL, da9052_onkey_irq, | |
115 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, | |
116 | "ONKEY", onkey); | |
117 | if (error < 0) { | |
118 | dev_err(onkey->da9052->dev, | |
119 | "Failed to register ONKEY IRQ %d, error = %d\n", | |
120 | onkey->irq, error); | |
121 | goto err_free_mem; | |
122 | } | |
123 | ||
124 | error = input_register_device(onkey->input); | |
125 | if (error) { | |
126 | dev_err(&pdev->dev, "Unable to register input device, %d\n", | |
127 | error); | |
128 | goto err_free_irq; | |
129 | } | |
130 | ||
131 | platform_set_drvdata(pdev, onkey); | |
132 | return 0; | |
133 | ||
134 | err_free_irq: | |
135 | free_irq(onkey->irq, onkey); | |
136 | cancel_delayed_work_sync(&onkey->work); | |
137 | err_free_mem: | |
138 | input_free_device(input_dev); | |
139 | kfree(onkey); | |
140 | ||
141 | return error; | |
142 | } | |
143 | ||
144 | static int __devexit da9052_onkey_remove(struct platform_device *pdev) | |
145 | { | |
146 | struct da9052_onkey *onkey = platform_get_drvdata(pdev); | |
147 | ||
148 | free_irq(onkey->irq, onkey); | |
149 | cancel_delayed_work_sync(&onkey->work); | |
150 | ||
151 | input_unregister_device(onkey->input); | |
152 | kfree(onkey); | |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
157 | static struct platform_driver da9052_onkey_driver = { | |
158 | .probe = da9052_onkey_probe, | |
1cb0aa88 | 159 | .remove = da9052_onkey_remove, |
f0c5f65b AJ |
160 | .driver = { |
161 | .name = "da9052-onkey", | |
162 | .owner = THIS_MODULE, | |
163 | }, | |
164 | }; | |
165 | module_platform_driver(da9052_onkey_driver); | |
166 | ||
167 | MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); | |
168 | MODULE_DESCRIPTION("Onkey driver for DA9052"); | |
169 | MODULE_LICENSE("GPL"); | |
170 | MODULE_ALIAS("platform:da9052-onkey"); |