cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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chtdc_ti_pwrbtn.c (2378B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Power-button driver for Dollar Cove TI PMIC
      4 * Copyright (C) 2014 Intel Corp
      5 * 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	0x3
     18#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 int 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	return 0;
     75}
     76
     77static const struct platform_device_id chtdc_ti_pwrbtn_id_table[] = {
     78	{ .name = "chtdc_ti_pwrbtn" },
     79	{},
     80};
     81MODULE_DEVICE_TABLE(platform, chtdc_ti_pwrbtn_id_table);
     82
     83static struct platform_driver chtdc_ti_pwrbtn_driver = {
     84	.driver = {
     85		.name	= KBUILD_MODNAME,
     86	},
     87	.probe		= chtdc_ti_pwrbtn_probe,
     88	.remove		= chtdc_ti_pwrbtn_remove,
     89	.id_table	= chtdc_ti_pwrbtn_id_table,
     90};
     91module_platform_driver(chtdc_ti_pwrbtn_driver);
     92
     93MODULE_DESCRIPTION("Power-button driver for Dollar Cove TI PMIC");
     94MODULE_LICENSE("GPL v2");