1/*
2 * ON pin driver for Dialog DA9055 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
18#include <linux/mfd/da9055/core.h>
19#include <linux/mfd/da9055/reg.h>
20
21struct da9055_onkey {
22 struct da9055 *da9055;
23 struct input_dev *input;
24 struct delayed_work work;
25};
26
27static void da9055_onkey_query(struct da9055_onkey *onkey)
28{
29 int key_stat;
30
31 key_stat = da9055_reg_read(onkey->da9055, DA9055_REG_STATUS_A);
32 if (key_stat < 0) {
33 dev_err(onkey->da9055->dev,
34 "Failed to read onkey event %d\n", key_stat);
35 } else {
36 key_stat &= DA9055_NOKEY_STS;
37 /*
38 * Onkey status bit is cleared when onkey button is released.
39 */
40 if (!key_stat) {
41 input_report_key(onkey->input, KEY_POWER, 0);
42 input_sync(onkey->input);
43 }
44 }
45
46 /*
47 * Interrupt is generated only when the ONKEY pin is asserted.
48 * Hence the deassertion of the pin is simulated through work queue.
49 */
50 if (key_stat)
51 schedule_delayed_work(&onkey->work, msecs_to_jiffies(10));
52
53}
54
55static void da9055_onkey_work(struct work_struct *work)
56{
57 struct da9055_onkey *onkey = container_of(work, struct da9055_onkey,
58 work.work);
59
60 da9055_onkey_query(onkey);
61}
62
63static irqreturn_t da9055_onkey_irq(int irq, void *data)
64{
65 struct da9055_onkey *onkey = data;
66
67 input_report_key(onkey->input, KEY_POWER, 1);
68 input_sync(onkey->input);
69
70 da9055_onkey_query(onkey);
71
72 return IRQ_HANDLED;
73}
74
75static int da9055_onkey_probe(struct platform_device *pdev)
76{
77 struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent);
78 struct da9055_onkey *onkey;
79 struct input_dev *input_dev;
80 int irq, err;
81
82 irq = platform_get_irq_byname(pdev, "ONKEY");
83 if (irq < 0) {
84 dev_err(&pdev->dev,
85 "Failed to get an IRQ for input device, %d\n", irq);
86 return -EINVAL;
87 }
88
89 onkey = devm_kzalloc(&pdev->dev, sizeof(*onkey), GFP_KERNEL);
90 if (!onkey) {
91 dev_err(&pdev->dev, "Failed to allocate memory\n");
92 return -ENOMEM;
93 }
94
95 input_dev = input_allocate_device();
96 if (!input_dev) {
97 dev_err(&pdev->dev, "Failed to allocate memory\n");
98 return -ENOMEM;
99 }
100
101 onkey->input = input_dev;
102 onkey->da9055 = da9055;
103 input_dev->name = "da9055-onkey";
104 input_dev->phys = "da9055-onkey/input0";
105 input_dev->dev.parent = &pdev->dev;
106
107 input_dev->evbit[0] = BIT_MASK(EV_KEY);
108 __set_bit(KEY_POWER, input_dev->keybit);
109
110 INIT_DELAYED_WORK(&onkey->work, da9055_onkey_work);
111
112 err = request_threaded_irq(irq, NULL, da9055_onkey_irq,
113 IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
114 "ONKEY", onkey);
115 if (err < 0) {
116 dev_err(&pdev->dev,
117 "Failed to register ONKEY IRQ %d, error = %d\n",
118 irq, err);
119 goto err_free_input;
120 }
121
122 err = input_register_device(input_dev);
123 if (err) {
124 dev_err(&pdev->dev, "Unable to register input device, %d\n",
125 err);
126 goto err_free_irq;
127 }
128
129 platform_set_drvdata(pdev, onkey);
130
131 return 0;
132
133err_free_irq:
134 free_irq(irq, onkey);
135 cancel_delayed_work_sync(&onkey->work);
136err_free_input:
137 input_free_device(input_dev);
138
139 return err;
140}
141
142static int da9055_onkey_remove(struct platform_device *pdev)
143{
144 struct da9055_onkey *onkey = platform_get_drvdata(pdev);
145 int irq = platform_get_irq_byname(pdev, "ONKEY");
146
147 irq = regmap_irq_get_virq(onkey->da9055->irq_data, irq);
148 free_irq(irq, onkey);
149 cancel_delayed_work_sync(&onkey->work);
150 input_unregister_device(onkey->input);
151
152 return 0;
153}
154
155static struct platform_driver da9055_onkey_driver = {
156 .probe = da9055_onkey_probe,
157 .remove = da9055_onkey_remove,
158 .driver = {
159 .name = "da9055-onkey",
160 },
161};
162
163module_platform_driver(da9055_onkey_driver);
164
165MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
166MODULE_DESCRIPTION("Onkey driver for DA9055");
167MODULE_LICENSE("GPL");
168MODULE_ALIAS("platform:da9055-onkey");
169