x86/xen: resume timer irqs early
[linux/fpc-iii.git] / drivers / input / misc / da9055_onkey.c
bloba0af8b2506ce150b831ab0e0efb0569ab70b8d35
1 /*
2 * ON pin driver for Dialog DA9055 PMICs
4 * Copyright(c) 2012 Dialog Semiconductor Ltd.
6 * Author: David Dajun Chen <dchen@diasemi.com>
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.
14 #include <linux/init.h>
15 #include <linux/input.h>
16 #include <linux/module.h>
17 #include <linux/platform_device.h>
19 #include <linux/mfd/da9055/core.h>
20 #include <linux/mfd/da9055/reg.h>
22 struct da9055_onkey {
23 struct da9055 *da9055;
24 struct input_dev *input;
25 struct delayed_work work;
28 static void da9055_onkey_query(struct da9055_onkey *onkey)
30 int key_stat;
32 key_stat = da9055_reg_read(onkey->da9055, DA9055_REG_STATUS_A);
33 if (key_stat < 0) {
34 dev_err(onkey->da9055->dev,
35 "Failed to read onkey event %d\n", key_stat);
36 } else {
37 key_stat &= DA9055_NOKEY_STS;
39 * Onkey status bit is cleared when onkey button is released.
41 if (!key_stat) {
42 input_report_key(onkey->input, KEY_POWER, 0);
43 input_sync(onkey->input);
48 * Interrupt is generated only when the ONKEY pin is asserted.
49 * Hence the deassertion of the pin is simulated through work queue.
51 if (key_stat)
52 schedule_delayed_work(&onkey->work, msecs_to_jiffies(10));
56 static void da9055_onkey_work(struct work_struct *work)
58 struct da9055_onkey *onkey = container_of(work, struct da9055_onkey,
59 work.work);
61 da9055_onkey_query(onkey);
64 static irqreturn_t da9055_onkey_irq(int irq, void *data)
66 struct da9055_onkey *onkey = data;
68 input_report_key(onkey->input, KEY_POWER, 1);
69 input_sync(onkey->input);
71 da9055_onkey_query(onkey);
73 return IRQ_HANDLED;
76 static int da9055_onkey_probe(struct platform_device *pdev)
78 struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent);
79 struct da9055_onkey *onkey;
80 struct input_dev *input_dev;
81 int irq, err;
83 irq = platform_get_irq_byname(pdev, "ONKEY");
84 if (irq < 0) {
85 dev_err(&pdev->dev,
86 "Failed to get an IRQ for input device, %d\n", irq);
87 return -EINVAL;
90 onkey = devm_kzalloc(&pdev->dev, sizeof(*onkey), GFP_KERNEL);
91 if (!onkey) {
92 dev_err(&pdev->dev, "Failed to allocate memory\n");
93 return -ENOMEM;
96 input_dev = input_allocate_device();
97 if (!input_dev) {
98 dev_err(&pdev->dev, "Failed to allocate memory\n");
99 return -ENOMEM;
102 onkey->input = input_dev;
103 onkey->da9055 = da9055;
104 input_dev->name = "da9055-onkey";
105 input_dev->phys = "da9055-onkey/input0";
106 input_dev->dev.parent = &pdev->dev;
108 input_dev->evbit[0] = BIT_MASK(EV_KEY);
109 __set_bit(KEY_POWER, input_dev->keybit);
111 INIT_DELAYED_WORK(&onkey->work, da9055_onkey_work);
113 irq = regmap_irq_get_virq(da9055->irq_data, irq);
114 err = request_threaded_irq(irq, NULL, da9055_onkey_irq,
115 IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
116 "ONKEY", onkey);
117 if (err < 0) {
118 dev_err(&pdev->dev,
119 "Failed to register ONKEY IRQ %d, error = %d\n",
120 irq, err);
121 goto err_free_input;
124 err = input_register_device(input_dev);
125 if (err) {
126 dev_err(&pdev->dev, "Unable to register input device, %d\n",
127 err);
128 goto err_free_irq;
131 platform_set_drvdata(pdev, onkey);
133 return 0;
135 err_free_irq:
136 free_irq(irq, onkey);
137 cancel_delayed_work_sync(&onkey->work);
138 err_free_input:
139 input_free_device(input_dev);
141 return err;
144 static int da9055_onkey_remove(struct platform_device *pdev)
146 struct da9055_onkey *onkey = platform_get_drvdata(pdev);
147 int irq = platform_get_irq_byname(pdev, "ONKEY");
149 irq = regmap_irq_get_virq(onkey->da9055->irq_data, irq);
150 free_irq(irq, onkey);
151 cancel_delayed_work_sync(&onkey->work);
152 input_unregister_device(onkey->input);
154 return 0;
157 static struct platform_driver da9055_onkey_driver = {
158 .probe = da9055_onkey_probe,
159 .remove = da9055_onkey_remove,
160 .driver = {
161 .name = "da9055-onkey",
162 .owner = THIS_MODULE,
166 module_platform_driver(da9055_onkey_driver);
168 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
169 MODULE_DESCRIPTION("Onkey driver for DA9055");
170 MODULE_LICENSE("GPL");
171 MODULE_ALIAS("platform:da9055-onkey");