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 | |
24 | static void da9052_onkey_query(struct da9052_onkey *onkey) |
25 | { |
26 | int ret; |
27 | |
28 | ret = da9052_reg_read(da9052: 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(dev: onkey->input, KEY_POWER, value: pressed); |
41 | input_sync(dev: 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(dwork: &onkey->work, |
50 | delay: msecs_to_jiffies(m: 50)); |
51 | } |
52 | } |
53 | |
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 | |
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 | |
71 | static int da9052_onkey_probe(struct platform_device *pdev) |
72 | { |
73 | struct da9052 *da9052 = dev_get_drvdata(dev: 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(size: 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(da9052: onkey->da9052, DA9052_IRQ_NONKEY, name: "ONKEY" , |
103 | handler: da9052_onkey_irq, data: 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, data: onkey); |
118 | return 0; |
119 | |
120 | err_free_irq: |
121 | da9052_free_irq(da9052: onkey->da9052, DA9052_IRQ_NONKEY, data: onkey); |
122 | cancel_delayed_work_sync(dwork: &onkey->work); |
123 | err_free_mem: |
124 | input_free_device(dev: input_dev); |
125 | kfree(objp: onkey); |
126 | |
127 | return error; |
128 | } |
129 | |
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(da9052: onkey->da9052, DA9052_IRQ_NONKEY, data: onkey); |
135 | cancel_delayed_work_sync(dwork: &onkey->work); |
136 | |
137 | input_unregister_device(onkey->input); |
138 | kfree(objp: 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 | |