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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da9052_onkey.c (3667B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * ON pin driver for Dialog DA9052 PMICs
      4 *
      5 * Copyright(c) 2012 Dialog Semiconductor Ltd.
      6 *
      7 * Author: David Dajun Chen <dchen@diasemi.com>
      8 */
      9
     10#include <linux/input.h>
     11#include <linux/module.h>
     12#include <linux/platform_device.h>
     13#include <linux/workqueue.h>
     14
     15#include <linux/mfd/da9052/da9052.h>
     16#include <linux/mfd/da9052/reg.h>
     17
     18struct da9052_onkey {
     19	struct da9052 *da9052;
     20	struct input_dev *input;
     21	struct delayed_work work;
     22};
     23
     24static void da9052_onkey_query(struct da9052_onkey *onkey)
     25{
     26	int ret;
     27
     28	ret = da9052_reg_read(onkey->da9052, DA9052_STATUS_A_REG);
     29	if (ret < 0) {
     30		dev_err(onkey->da9052->dev,
     31			"Failed to read onkey event err=%d\n", ret);
     32	} else {
     33		/*
     34		 * Since interrupt for deassertion of ONKEY pin is not
     35		 * generated, onkey event state determines the onkey
     36		 * button state.
     37		 */
     38		bool pressed = !(ret & DA9052_STATUSA_NONKEY);
     39
     40		input_report_key(onkey->input, KEY_POWER, pressed);
     41		input_sync(onkey->input);
     42
     43		/*
     44		 * Interrupt is generated only when the ONKEY pin
     45		 * is asserted.  Hence the deassertion of the pin
     46		 * is simulated through work queue.
     47		 */
     48		if (pressed)
     49			schedule_delayed_work(&onkey->work,
     50						msecs_to_jiffies(50));
     51	}
     52}
     53
     54static void da9052_onkey_work(struct work_struct *work)
     55{
     56	struct da9052_onkey *onkey = container_of(work, struct da9052_onkey,
     57						  work.work);
     58
     59	da9052_onkey_query(onkey);
     60}
     61
     62static irqreturn_t da9052_onkey_irq(int irq, void *data)
     63{
     64	struct da9052_onkey *onkey = data;
     65
     66	da9052_onkey_query(onkey);
     67
     68	return IRQ_HANDLED;
     69}
     70
     71static int da9052_onkey_probe(struct platform_device *pdev)
     72{
     73	struct da9052 *da9052 = dev_get_drvdata(pdev->dev.parent);
     74	struct da9052_onkey *onkey;
     75	struct input_dev *input_dev;
     76	int error;
     77
     78	if (!da9052) {
     79		dev_err(&pdev->dev, "Failed to get the driver's data\n");
     80		return -EINVAL;
     81	}
     82
     83	onkey = kzalloc(sizeof(*onkey), GFP_KERNEL);
     84	input_dev = input_allocate_device();
     85	if (!onkey || !input_dev) {
     86		dev_err(&pdev->dev, "Failed to allocate memory\n");
     87		error = -ENOMEM;
     88		goto err_free_mem;
     89	}
     90
     91	onkey->input = input_dev;
     92	onkey->da9052 = da9052;
     93	INIT_DELAYED_WORK(&onkey->work, da9052_onkey_work);
     94
     95	input_dev->name = "da9052-onkey";
     96	input_dev->phys = "da9052-onkey/input0";
     97	input_dev->dev.parent = &pdev->dev;
     98
     99	input_dev->evbit[0] = BIT_MASK(EV_KEY);
    100	__set_bit(KEY_POWER, input_dev->keybit);
    101
    102	error = da9052_request_irq(onkey->da9052, DA9052_IRQ_NONKEY, "ONKEY",
    103			    da9052_onkey_irq, onkey);
    104	if (error < 0) {
    105		dev_err(onkey->da9052->dev,
    106			"Failed to register ONKEY IRQ: %d\n", error);
    107		goto err_free_mem;
    108	}
    109
    110	error = input_register_device(onkey->input);
    111	if (error) {
    112		dev_err(&pdev->dev, "Unable to register input device, %d\n",
    113			error);
    114		goto err_free_irq;
    115	}
    116
    117	platform_set_drvdata(pdev, onkey);
    118	return 0;
    119
    120err_free_irq:
    121	da9052_free_irq(onkey->da9052, DA9052_IRQ_NONKEY, onkey);
    122	cancel_delayed_work_sync(&onkey->work);
    123err_free_mem:
    124	input_free_device(input_dev);
    125	kfree(onkey);
    126
    127	return error;
    128}
    129
    130static int da9052_onkey_remove(struct platform_device *pdev)
    131{
    132	struct da9052_onkey *onkey = platform_get_drvdata(pdev);
    133
    134	da9052_free_irq(onkey->da9052, DA9052_IRQ_NONKEY, onkey);
    135	cancel_delayed_work_sync(&onkey->work);
    136
    137	input_unregister_device(onkey->input);
    138	kfree(onkey);
    139
    140	return 0;
    141}
    142
    143static struct platform_driver da9052_onkey_driver = {
    144	.probe	= da9052_onkey_probe,
    145	.remove	= da9052_onkey_remove,
    146	.driver = {
    147		.name	= "da9052-onkey",
    148	},
    149};
    150module_platform_driver(da9052_onkey_driver);
    151
    152MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
    153MODULE_DESCRIPTION("Onkey driver for DA9052");
    154MODULE_LICENSE("GPL");
    155MODULE_ALIAS("platform:da9052-onkey");