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 | |
21 | struct da9055_onkey { |
22 | struct da9055 *da9055; |
23 | struct input_dev *input; |
24 | struct delayed_work work; |
25 | }; |
26 | |
27 | static 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 | |
55 | static 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 | |
63 | static 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 | |
75 | static 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 | |
133 | err_free_irq: |
134 | free_irq(irq, onkey); |
135 | cancel_delayed_work_sync(&onkey->work); |
136 | err_free_input: |
137 | input_free_device(input_dev); |
138 | |
139 | return err; |
140 | } |
141 | |
142 | static 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 | |
155 | static 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 | |
163 | module_platform_driver(da9055_onkey_driver); |
164 | |
165 | MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>" ); |
166 | MODULE_DESCRIPTION("Onkey driver for DA9055" ); |
167 | MODULE_LICENSE("GPL" ); |
168 | MODULE_ALIAS("platform:da9055-onkey" ); |
169 | |