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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * ON pin driver for Dialog DA9052 PMICs
4 *
5 * Copyright(c) 2012 Dialog Semiconductor Ltd.
6 *
7 * Author: David Dajun Chen <dchen@diasemi.com>
8 */
9
10#include <linux/input.h>
11#include <linux/module.h>
12#include <linux/platform_device.h>
13#include <linux/workqueue.h>
14
15#include <linux/mfd/da9052/da9052.h>
16#include <linux/mfd/da9052/reg.h>
17
18struct da9052_onkey {
19 struct da9052 *da9052;
20 struct input_dev *input;
21 struct delayed_work work;
22};
23
24static void da9052_onkey_query(struct da9052_onkey *onkey)
25{
26 int ret;
27
28 ret = da9052_reg_read(onkey->da9052, DA9052_STATUS_A_REG);
29 if (ret < 0) {
30 dev_err(onkey->da9052->dev,
31 "Failed to read onkey event err=%d\n", ret);
32 } else {
33 /*
34 * Since interrupt for deassertion of ONKEY pin is not
35 * generated, onkey event state determines the onkey
36 * button state.
37 */
38 bool pressed = !(ret & DA9052_STATUSA_NONKEY);
39
40 input_report_key(onkey->input, KEY_POWER, pressed);
41 input_sync(onkey->input);
42
43 /*
44 * Interrupt is generated only when the ONKEY pin
45 * is asserted. Hence the deassertion of the pin
46 * is simulated through work queue.
47 */
48 if (pressed)
49 schedule_delayed_work(&onkey->work,
50 msecs_to_jiffies(50));
51 }
52}
53
54static void da9052_onkey_work(struct work_struct *work)
55{
56 struct da9052_onkey *onkey = container_of(work, struct da9052_onkey,
57 work.work);
58
59 da9052_onkey_query(onkey);
60}
61
62static irqreturn_t da9052_onkey_irq(int irq, void *data)
63{
64 struct da9052_onkey *onkey = data;
65
66 da9052_onkey_query(onkey);
67
68 return IRQ_HANDLED;
69}
70
71static int da9052_onkey_probe(struct platform_device *pdev)
72{
73 struct da9052 *da9052 = dev_get_drvdata(pdev->dev.parent);
74 struct da9052_onkey *onkey;
75 struct input_dev *input_dev;
76 int error;
77
78 if (!da9052) {
79 dev_err(&pdev->dev, "Failed to get the driver's data\n");
80 return -EINVAL;
81 }
82
83 onkey = kzalloc(sizeof(*onkey), GFP_KERNEL);
84 input_dev = input_allocate_device();
85 if (!onkey || !input_dev) {
86 dev_err(&pdev->dev, "Failed to allocate memory\n");
87 error = -ENOMEM;
88 goto err_free_mem;
89 }
90
91 onkey->input = input_dev;
92 onkey->da9052 = da9052;
93 INIT_DELAYED_WORK(&onkey->work, da9052_onkey_work);
94
95 input_dev->name = "da9052-onkey";
96 input_dev->phys = "da9052-onkey/input0";
97 input_dev->dev.parent = &pdev->dev;
98
99 input_dev->evbit[0] = BIT_MASK(EV_KEY);
100 __set_bit(KEY_POWER, input_dev->keybit);
101
102 error = da9052_request_irq(onkey->da9052, DA9052_IRQ_NONKEY, "ONKEY",
103 da9052_onkey_irq, onkey);
104 if (error < 0) {
105 dev_err(onkey->da9052->dev,
106 "Failed to register ONKEY IRQ: %d\n", error);
107 goto err_free_mem;
108 }
109
110 error = input_register_device(onkey->input);
111 if (error) {
112 dev_err(&pdev->dev, "Unable to register input device, %d\n",
113 error);
114 goto err_free_irq;
115 }
116
117 platform_set_drvdata(pdev, onkey);
118 return 0;
119
120err_free_irq:
121 da9052_free_irq(onkey->da9052, DA9052_IRQ_NONKEY, onkey);
122 cancel_delayed_work_sync(&onkey->work);
123err_free_mem:
124 input_free_device(input_dev);
125 kfree(onkey);
126
127 return error;
128}
129
130static int da9052_onkey_remove(struct platform_device *pdev)
131{
132 struct da9052_onkey *onkey = platform_get_drvdata(pdev);
133
134 da9052_free_irq(onkey->da9052, DA9052_IRQ_NONKEY, onkey);
135 cancel_delayed_work_sync(&onkey->work);
136
137 input_unregister_device(onkey->input);
138 kfree(onkey);
139
140 return 0;
141}
142
143static struct platform_driver da9052_onkey_driver = {
144 .probe = da9052_onkey_probe,
145 .remove = da9052_onkey_remove,
146 .driver = {
147 .name = "da9052-onkey",
148 },
149};
150module_platform_driver(da9052_onkey_driver);
151
152MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
153MODULE_DESCRIPTION("Onkey driver for DA9052");
154MODULE_LICENSE("GPL");
155MODULE_ALIAS("platform:da9052-onkey");
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
23struct da9052_onkey {
24 struct da9052 *da9052;
25 struct input_dev *input;
26 struct delayed_work work;
27 unsigned int irq;
28};
29
30static 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
57static 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
65static 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
74static 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");
98 error = -ENOMEM;
99 goto err_free_mem;
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
134err_free_irq:
135 free_irq(onkey->irq, onkey);
136 cancel_delayed_work_sync(&onkey->work);
137err_free_mem:
138 input_free_device(input_dev);
139 kfree(onkey);
140
141 return error;
142}
143
144static 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
157static struct platform_driver da9052_onkey_driver = {
158 .probe = da9052_onkey_probe,
159 .remove = __devexit_p(da9052_onkey_remove),
160 .driver = {
161 .name = "da9052-onkey",
162 .owner = THIS_MODULE,
163 },
164};
165module_platform_driver(da9052_onkey_driver);
166
167MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
168MODULE_DESCRIPTION("Onkey driver for DA9052");
169MODULE_LICENSE("GPL");
170MODULE_ALIAS("platform:da9052-onkey");