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/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
22struct da9052_onkey {
23 struct da9052 *da9052;
24 struct input_dev *input;
25 struct delayed_work work;
26};
27
28static void da9052_onkey_query(struct da9052_onkey *onkey)
29{
30 int ret;
31
32 ret = da9052_reg_read(onkey->da9052, DA9052_STATUS_A_REG);
33 if (ret < 0) {
34 dev_err(onkey->da9052->dev,
35 "Failed to read onkey event err=%d\n", ret);
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 */
42 bool pressed = !(ret & DA9052_STATUSA_NONKEY);
43
44 input_report_key(onkey->input, KEY_POWER, pressed);
45 input_sync(onkey->input);
46
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 }
56}
57
58static 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
66static 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
75static int da9052_onkey_probe(struct platform_device *pdev)
76{
77 struct da9052 *da9052 = dev_get_drvdata(pdev->dev.parent);
78 struct da9052_onkey *onkey;
79 struct input_dev *input_dev;
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 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");
91 error = -ENOMEM;
92 goto err_free_mem;
93 }
94
95 onkey->input = input_dev;
96 onkey->da9052 = da9052;
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
106 error = da9052_request_irq(onkey->da9052, DA9052_IRQ_NONKEY, "ONKEY",
107 da9052_onkey_irq, onkey);
108 if (error < 0) {
109 dev_err(onkey->da9052->dev,
110 "Failed to register ONKEY IRQ: %d\n", error);
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
124err_free_irq:
125 da9052_free_irq(onkey->da9052, DA9052_IRQ_NONKEY, onkey);
126 cancel_delayed_work_sync(&onkey->work);
127err_free_mem:
128 input_free_device(input_dev);
129 kfree(onkey);
130
131 return error;
132}
133
134static int da9052_onkey_remove(struct platform_device *pdev)
135{
136 struct da9052_onkey *onkey = platform_get_drvdata(pdev);
137
138 da9052_free_irq(onkey->da9052, DA9052_IRQ_NONKEY, onkey);
139 cancel_delayed_work_sync(&onkey->work);
140
141 input_unregister_device(onkey->input);
142 kfree(onkey);
143
144 return 0;
145}
146
147static struct platform_driver da9052_onkey_driver = {
148 .probe = da9052_onkey_probe,
149 .remove = da9052_onkey_remove,
150 .driver = {
151 .name = "da9052-onkey",
152 },
153};
154module_platform_driver(da9052_onkey_driver);
155
156MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
157MODULE_DESCRIPTION("Onkey driver for DA9052");
158MODULE_LICENSE("GPL");
159MODULE_ALIAS("platform:da9052-onkey");
160