161 lines
3.8 KiB
C
161 lines
3.8 KiB
C
/*
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* ON pin driver for Dialog DA9052 PMICs
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*
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* Copyright(c) 2012 Dialog Semiconductor Ltd.
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*
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* Author: David Dajun Chen <dchen@diasemi.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/input.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/workqueue.h>
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#include <linux/mfd/da9052/da9052.h>
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#include <linux/mfd/da9052/reg.h>
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struct da9052_onkey {
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struct da9052 *da9052;
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struct input_dev *input;
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struct delayed_work work;
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};
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static void da9052_onkey_query(struct da9052_onkey *onkey)
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{
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int ret;
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ret = da9052_reg_read(onkey->da9052, DA9052_STATUS_A_REG);
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if (ret < 0) {
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dev_err(onkey->da9052->dev,
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"Failed to read onkey event err=%d\n", ret);
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} else {
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/*
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* Since interrupt for deassertion of ONKEY pin is not
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* generated, onkey event state determines the onkey
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* button state.
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*/
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bool pressed = !(ret & DA9052_STATUSA_NONKEY);
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input_report_key(onkey->input, KEY_POWER, pressed);
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input_sync(onkey->input);
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/*
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* Interrupt is generated only when the ONKEY pin
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* is asserted. Hence the deassertion of the pin
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* is simulated through work queue.
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*/
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if (pressed)
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schedule_delayed_work(&onkey->work,
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msecs_to_jiffies(50));
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}
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}
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static void da9052_onkey_work(struct work_struct *work)
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{
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struct da9052_onkey *onkey = container_of(work, struct da9052_onkey,
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work.work);
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da9052_onkey_query(onkey);
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}
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static irqreturn_t da9052_onkey_irq(int irq, void *data)
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{
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struct da9052_onkey *onkey = data;
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da9052_onkey_query(onkey);
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return IRQ_HANDLED;
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}
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static int da9052_onkey_probe(struct platform_device *pdev)
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{
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struct da9052 *da9052 = dev_get_drvdata(pdev->dev.parent);
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struct da9052_onkey *onkey;
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struct input_dev *input_dev;
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int error;
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if (!da9052) {
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dev_err(&pdev->dev, "Failed to get the driver's data\n");
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return -EINVAL;
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}
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onkey = kzalloc(sizeof(*onkey), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!onkey || !input_dev) {
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dev_err(&pdev->dev, "Failed to allocate memory\n");
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error = -ENOMEM;
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goto err_free_mem;
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}
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onkey->input = input_dev;
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onkey->da9052 = da9052;
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INIT_DELAYED_WORK(&onkey->work, da9052_onkey_work);
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input_dev->name = "da9052-onkey";
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input_dev->phys = "da9052-onkey/input0";
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input_dev->dev.parent = &pdev->dev;
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input_dev->evbit[0] = BIT_MASK(EV_KEY);
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__set_bit(KEY_POWER, input_dev->keybit);
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error = da9052_request_irq(onkey->da9052, DA9052_IRQ_NONKEY, "ONKEY",
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da9052_onkey_irq, onkey);
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if (error < 0) {
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dev_err(onkey->da9052->dev,
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"Failed to register ONKEY IRQ: %d\n", error);
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goto err_free_mem;
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}
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error = input_register_device(onkey->input);
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if (error) {
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dev_err(&pdev->dev, "Unable to register input device, %d\n",
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error);
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goto err_free_irq;
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}
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platform_set_drvdata(pdev, onkey);
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return 0;
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err_free_irq:
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da9052_free_irq(onkey->da9052, DA9052_IRQ_NONKEY, onkey);
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cancel_delayed_work_sync(&onkey->work);
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err_free_mem:
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input_free_device(input_dev);
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kfree(onkey);
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return error;
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}
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static int da9052_onkey_remove(struct platform_device *pdev)
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{
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struct da9052_onkey *onkey = platform_get_drvdata(pdev);
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da9052_free_irq(onkey->da9052, DA9052_IRQ_NONKEY, onkey);
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cancel_delayed_work_sync(&onkey->work);
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input_unregister_device(onkey->input);
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kfree(onkey);
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return 0;
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}
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static struct platform_driver da9052_onkey_driver = {
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.probe = da9052_onkey_probe,
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.remove = da9052_onkey_remove,
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.driver = {
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.name = "da9052-onkey",
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.owner = THIS_MODULE,
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},
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};
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module_platform_driver(da9052_onkey_driver);
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MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
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MODULE_DESCRIPTION("Onkey driver for DA9052");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:da9052-onkey");
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