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// SPDX-License-Identifier: GPL-2.0
/*
* Power-button driver for Dollar Cove TI PMIC
* Copyright (C) 2014 Intel Corp
* Copyright (c) 2017 Takashi Iwai <tiwai@suse.de>
*/
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/mfd/intel_soc_pmic.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_wakeirq.h>
#include <linux/slab.h>
#define CHTDC_TI_SIRQ_REG 0x3
#define SIRQ_PWRBTN_REL BIT(0)
static irqreturn_t chtdc_ti_pwrbtn_interrupt(int irq, void *dev_id)
{
struct input_dev *input = dev_id;
struct device *dev = input->dev.parent;
struct regmap *regmap = dev_get_drvdata(dev);
int state;
if (!regmap_read(regmap, CHTDC_TI_SIRQ_REG, &state)) {
dev_dbg(dev, "SIRQ_REG=0x%x\n", state);
input_report_key(input, KEY_POWER, !(state & SIRQ_PWRBTN_REL));
input_sync(input);
}
return IRQ_HANDLED;
}
static int chtdc_ti_pwrbtn_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent);
struct input_dev *input;
int irq, err;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
input = devm_input_allocate_device(dev);
if (!input)
return -ENOMEM;
input->name = pdev->name;
input->phys = "power-button/input0";
input->id.bustype = BUS_HOST;
input_set_capability(input, EV_KEY, KEY_POWER);
err = input_register_device(input);
if (err)
return err;
dev_set_drvdata(dev, pmic->regmap);
err = devm_request_threaded_irq(dev, irq, NULL,
chtdc_ti_pwrbtn_interrupt,
IRQF_ONESHOT, KBUILD_MODNAME, input);
if (err)
return err;
device_init_wakeup(dev, true);
dev_pm_set_wake_irq(dev, irq);
return 0;
}
static int chtdc_ti_pwrbtn_remove(struct platform_device *pdev)
{
dev_pm_clear_wake_irq(&pdev->dev);
device_init_wakeup(&pdev->dev, false);
return 0;
}
static const struct platform_device_id chtdc_ti_pwrbtn_id_table[] = {
{ .name = "chtdc_ti_pwrbtn" },
{},
};
MODULE_DEVICE_TABLE(platform, chtdc_ti_pwrbtn_id_table);
static struct platform_driver chtdc_ti_pwrbtn_driver = {
.driver = {
.name = KBUILD_MODNAME,
},
.probe = chtdc_ti_pwrbtn_probe,
.remove = chtdc_ti_pwrbtn_remove,
.id_table = chtdc_ti_pwrbtn_id_table,
};
module_platform_driver(chtdc_ti_pwrbtn_driver);
MODULE_DESCRIPTION("Power-button driver for Dollar Cove TI PMIC");
MODULE_LICENSE("GPL v2");
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