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1// SPDX-License-Identifier: GPL-2.02/*3 * Power-button driver for Dollar Cove TI PMIC4 * Copyright (C) 2014 Intel Corp5 * Copyright (c) 2017 Takashi Iwai <tiwai@suse.de>6 */7 8#include <linux/input.h>9#include <linux/interrupt.h>10#include <linux/device.h>11#include <linux/mfd/intel_soc_pmic.h>12#include <linux/module.h>13#include <linux/platform_device.h>14#include <linux/pm_wakeirq.h>15#include <linux/slab.h>16 17#define CHTDC_TI_SIRQ_REG 0x318#define SIRQ_PWRBTN_REL BIT(0)19 20static irqreturn_t chtdc_ti_pwrbtn_interrupt(int irq, void *dev_id)21{22 struct input_dev *input = dev_id;23 struct device *dev = input->dev.parent;24 struct regmap *regmap = dev_get_drvdata(dev);25 int state;26 27 if (!regmap_read(regmap, CHTDC_TI_SIRQ_REG, &state)) {28 dev_dbg(dev, "SIRQ_REG=0x%x\n", state);29 input_report_key(input, KEY_POWER, !(state & SIRQ_PWRBTN_REL));30 input_sync(input);31 }32 33 return IRQ_HANDLED;34}35 36static int chtdc_ti_pwrbtn_probe(struct platform_device *pdev)37{38 struct device *dev = &pdev->dev;39 struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent);40 struct input_dev *input;41 int irq, err;42 43 irq = platform_get_irq(pdev, 0);44 if (irq < 0)45 return irq;46 input = devm_input_allocate_device(dev);47 if (!input)48 return -ENOMEM;49 input->name = pdev->name;50 input->phys = "power-button/input0";51 input->id.bustype = BUS_HOST;52 input_set_capability(input, EV_KEY, KEY_POWER);53 err = input_register_device(input);54 if (err)55 return err;56 57 dev_set_drvdata(dev, pmic->regmap);58 59 err = devm_request_threaded_irq(dev, irq, NULL,60 chtdc_ti_pwrbtn_interrupt,61 IRQF_ONESHOT, KBUILD_MODNAME, input);62 if (err)63 return err;64 65 device_init_wakeup(dev, true);66 dev_pm_set_wake_irq(dev, irq);67 return 0;68}69 70static void chtdc_ti_pwrbtn_remove(struct platform_device *pdev)71{72 dev_pm_clear_wake_irq(&pdev->dev);73 device_init_wakeup(&pdev->dev, false);74}75 76static const struct platform_device_id chtdc_ti_pwrbtn_id_table[] = {77 { .name = "chtdc_ti_pwrbtn" },78 {},79};80MODULE_DEVICE_TABLE(platform, chtdc_ti_pwrbtn_id_table);81 82static struct platform_driver chtdc_ti_pwrbtn_driver = {83 .driver = {84 .name = KBUILD_MODNAME,85 },86 .probe = chtdc_ti_pwrbtn_probe,87 .remove_new = chtdc_ti_pwrbtn_remove,88 .id_table = chtdc_ti_pwrbtn_id_table,89};90module_platform_driver(chtdc_ti_pwrbtn_driver);91 92MODULE_DESCRIPTION("Power-button driver for Dollar Cove TI PMIC");93MODULE_LICENSE("GPL v2");94