/**
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* CPCAP Power Button Input Driver
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*
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* Copyright (C) 2017 Sebastian Reichel <sre@kernel.org>
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file "COPYING" in the main directory of this
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* archive for more details.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/regmap.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/motorola-cpcap.h>
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#define CPCAP_IRQ_ON 23
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#define CPCAP_IRQ_ON_BITMASK (1 << (CPCAP_IRQ_ON % 16))
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struct cpcap_power_button {
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struct regmap *regmap;
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struct input_dev *idev;
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struct device *dev;
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};
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static irqreturn_t powerbutton_irq(int irq, void *_button)
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{
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struct cpcap_power_button *button = _button;
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int val;
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val = cpcap_sense_virq(button->regmap, irq);
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if (val < 0) {
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dev_err(button->dev, "irq read failed: %d", val);
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return IRQ_HANDLED;
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}
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pm_wakeup_event(button->dev, 0);
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input_report_key(button->idev, KEY_POWER, val);
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input_sync(button->idev);
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return IRQ_HANDLED;
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}
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static int cpcap_power_button_probe(struct platform_device *pdev)
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{
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struct cpcap_power_button *button;
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int irq = platform_get_irq(pdev, 0);
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int err;
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button = devm_kmalloc(&pdev->dev, sizeof(*button), GFP_KERNEL);
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if (!button)
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return -ENOMEM;
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button->idev = devm_input_allocate_device(&pdev->dev);
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if (!button->idev)
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return -ENOMEM;
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button->regmap = dev_get_regmap(pdev->dev.parent, NULL);
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if (!button->regmap)
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return -ENODEV;
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button->dev = &pdev->dev;
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button->idev->name = "cpcap-pwrbutton";
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button->idev->phys = "cpcap-pwrbutton/input0";
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button->idev->dev.parent = button->dev;
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input_set_capability(button->idev, EV_KEY, KEY_POWER);
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err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
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powerbutton_irq, IRQF_ONESHOT, "cpcap_pwrbutton", button);
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if (err < 0) {
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dev_err(&pdev->dev, "IRQ request failed: %d\n", err);
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return err;
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}
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err = input_register_device(button->idev);
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if (err) {
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dev_err(&pdev->dev, "Input register failed: %d\n", err);
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return err;
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}
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device_init_wakeup(&pdev->dev, true);
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return 0;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id cpcap_pwrbutton_dt_match_table[] = {
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{ .compatible = "motorola,cpcap-pwrbutton" },
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{},
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};
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MODULE_DEVICE_TABLE(of, cpcap_pwrbutton_dt_match_table);
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#endif
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static struct platform_driver cpcap_power_button_driver = {
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.probe = cpcap_power_button_probe,
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.driver = {
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.name = "cpcap-pwrbutton",
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.of_match_table = of_match_ptr(cpcap_pwrbutton_dt_match_table),
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},
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};
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module_platform_driver(cpcap_power_button_driver);
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MODULE_ALIAS("platform:cpcap-pwrbutton");
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MODULE_DESCRIPTION("CPCAP Power Button");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");
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