/*
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* Hisilicon PMIC powerkey driver
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*
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* Copyright (C) 2013 Hisilicon Ltd.
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* Copyright (C) 2015, 2016 Linaro Ltd.
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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/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/reboot.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of_irq.h>
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#include <linux/input.h>
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#include <linux/slab.h>
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/* the held interrupt will trigger after 4 seconds */
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#define MAX_HELD_TIME (4 * MSEC_PER_SEC)
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static irqreturn_t hi65xx_power_press_isr(int irq, void *q)
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{
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struct input_dev *input = q;
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pm_wakeup_event(input->dev.parent, MAX_HELD_TIME);
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input_report_key(input, KEY_POWER, 1);
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input_sync(input);
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return IRQ_HANDLED;
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}
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static irqreturn_t hi65xx_power_release_isr(int irq, void *q)
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{
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struct input_dev *input = q;
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pm_wakeup_event(input->dev.parent, MAX_HELD_TIME);
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input_report_key(input, KEY_POWER, 0);
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input_sync(input);
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return IRQ_HANDLED;
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}
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static irqreturn_t hi65xx_restart_toggle_isr(int irq, void *q)
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{
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struct input_dev *input = q;
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int value = test_bit(KEY_RESTART, input->key);
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pm_wakeup_event(input->dev.parent, MAX_HELD_TIME);
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input_report_key(input, KEY_RESTART, !value);
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input_sync(input);
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return IRQ_HANDLED;
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}
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static const struct {
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const char *name;
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irqreturn_t (*handler)(int irq, void *q);
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} hi65xx_irq_info[] = {
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{ "down", hi65xx_power_press_isr },
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{ "up", hi65xx_power_release_isr },
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{ "hold 4s", hi65xx_restart_toggle_isr },
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};
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static int hi65xx_powerkey_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct input_dev *input;
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int irq, i, error;
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input = devm_input_allocate_device(dev);
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if (!input) {
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dev_err(dev, "failed to allocate input device\n");
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return -ENOMEM;
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}
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input->phys = "hisi_on/input0";
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input->name = "HISI 65xx PowerOn Key";
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input_set_capability(input, EV_KEY, KEY_POWER);
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input_set_capability(input, EV_KEY, KEY_RESTART);
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for (i = 0; i < ARRAY_SIZE(hi65xx_irq_info); i++) {
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irq = platform_get_irq_byname(pdev, hi65xx_irq_info[i].name);
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if (irq < 0)
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return irq;
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error = devm_request_any_context_irq(dev, irq,
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hi65xx_irq_info[i].handler,
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IRQF_ONESHOT,
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hi65xx_irq_info[i].name,
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input);
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if (error < 0) {
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dev_err(dev, "couldn't request irq %s: %d\n",
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hi65xx_irq_info[i].name, error);
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return error;
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}
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}
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error = input_register_device(input);
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if (error) {
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dev_err(dev, "failed to register input device: %d\n", error);
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return error;
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}
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device_init_wakeup(dev, 1);
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return 0;
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}
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static struct platform_driver hi65xx_powerkey_driver = {
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.driver = {
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.name = "hi65xx-powerkey",
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},
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.probe = hi65xx_powerkey_probe,
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};
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module_platform_driver(hi65xx_powerkey_driver);
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MODULE_AUTHOR("Zhiliang Xue <xuezhiliang@huawei.com");
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MODULE_DESCRIPTION("Hisi PMIC Power key driver");
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MODULE_LICENSE("GPL v2");
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