169 lines
3.9 KiB
C
169 lines
3.9 KiB
C
/*
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* ON pin driver for Dialog DA9055 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/mfd/da9055/core.h>
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#include <linux/mfd/da9055/reg.h>
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struct da9055_onkey {
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struct da9055 *da9055;
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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 da9055_onkey_query(struct da9055_onkey *onkey)
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{
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int key_stat;
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key_stat = da9055_reg_read(onkey->da9055, DA9055_REG_STATUS_A);
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if (key_stat < 0) {
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dev_err(onkey->da9055->dev,
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"Failed to read onkey event %d\n", key_stat);
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} else {
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key_stat &= DA9055_NOKEY_STS;
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/*
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* Onkey status bit is cleared when onkey button is released.
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*/
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if (!key_stat) {
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input_report_key(onkey->input, KEY_POWER, 0);
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input_sync(onkey->input);
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}
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}
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/*
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* Interrupt is generated only when the ONKEY pin is asserted.
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* Hence the deassertion of the pin is simulated through work queue.
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*/
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if (key_stat)
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schedule_delayed_work(&onkey->work, msecs_to_jiffies(10));
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}
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static void da9055_onkey_work(struct work_struct *work)
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{
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struct da9055_onkey *onkey = container_of(work, struct da9055_onkey,
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work.work);
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da9055_onkey_query(onkey);
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}
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static irqreturn_t da9055_onkey_irq(int irq, void *data)
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{
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struct da9055_onkey *onkey = data;
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input_report_key(onkey->input, KEY_POWER, 1);
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input_sync(onkey->input);
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da9055_onkey_query(onkey);
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return IRQ_HANDLED;
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}
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static int da9055_onkey_probe(struct platform_device *pdev)
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{
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struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent);
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struct da9055_onkey *onkey;
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struct input_dev *input_dev;
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int irq, err;
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irq = platform_get_irq_byname(pdev, "ONKEY");
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if (irq < 0) {
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dev_err(&pdev->dev,
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"Failed to get an IRQ for input device, %d\n", irq);
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return -EINVAL;
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}
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onkey = devm_kzalloc(&pdev->dev, sizeof(*onkey), GFP_KERNEL);
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if (!onkey) {
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dev_err(&pdev->dev, "Failed to allocate memory\n");
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return -ENOMEM;
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}
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input_dev = input_allocate_device();
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if (!input_dev) {
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dev_err(&pdev->dev, "Failed to allocate memory\n");
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return -ENOMEM;
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}
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onkey->input = input_dev;
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onkey->da9055 = da9055;
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input_dev->name = "da9055-onkey";
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input_dev->phys = "da9055-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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INIT_DELAYED_WORK(&onkey->work, da9055_onkey_work);
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err = request_threaded_irq(irq, NULL, da9055_onkey_irq,
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IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
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"ONKEY", onkey);
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if (err < 0) {
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dev_err(&pdev->dev,
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"Failed to register ONKEY IRQ %d, error = %d\n",
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irq, err);
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goto err_free_input;
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}
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err = input_register_device(input_dev);
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if (err) {
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dev_err(&pdev->dev, "Unable to register input device, %d\n",
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err);
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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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free_irq(irq, onkey);
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cancel_delayed_work_sync(&onkey->work);
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err_free_input:
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input_free_device(input_dev);
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return err;
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}
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static int da9055_onkey_remove(struct platform_device *pdev)
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{
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struct da9055_onkey *onkey = platform_get_drvdata(pdev);
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int irq = platform_get_irq_byname(pdev, "ONKEY");
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irq = regmap_irq_get_virq(onkey->da9055->irq_data, irq);
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free_irq(irq, onkey);
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cancel_delayed_work_sync(&onkey->work);
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input_unregister_device(onkey->input);
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return 0;
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}
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static struct platform_driver da9055_onkey_driver = {
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.probe = da9055_onkey_probe,
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.remove = da9055_onkey_remove,
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.driver = {
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.name = "da9055-onkey",
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},
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};
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module_platform_driver(da9055_onkey_driver);
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MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
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MODULE_DESCRIPTION("Onkey driver for DA9055");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:da9055-onkey");
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