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
18 struct da9052_onkey {
19 struct da9052 *da9052;
20 struct input_dev *input;
21 struct delayed_work work;
22 };
23
da9052_onkey_query(struct da9052_onkey * onkey)24 static 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
da9052_onkey_work(struct work_struct * work)54 static 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
da9052_onkey_irq(int irq,void * data)62 static 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
da9052_onkey_probe(struct platform_device * pdev)71 static 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
120 err_free_irq:
121 da9052_free_irq(onkey->da9052, DA9052_IRQ_NONKEY, onkey);
122 cancel_delayed_work_sync(&onkey->work);
123 err_free_mem:
124 input_free_device(input_dev);
125 kfree(onkey);
126
127 return error;
128 }
129
da9052_onkey_remove(struct platform_device * pdev)130 static 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
143 static struct platform_driver da9052_onkey_driver = {
144 .probe = da9052_onkey_probe,
145 .remove = da9052_onkey_remove,
146 .driver = {
147 .name = "da9052-onkey",
148 },
149 };
150 module_platform_driver(da9052_onkey_driver);
151
152 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
153 MODULE_DESCRIPTION("Onkey driver for DA9052");
154 MODULE_LICENSE("GPL");
155 MODULE_ALIAS("platform:da9052-onkey");
156