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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da9055_onkey.c (3732B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * ON pin driver for Dialog DA9055 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
     14#include <linux/mfd/da9055/core.h>
     15#include <linux/mfd/da9055/reg.h>
     16
     17struct da9055_onkey {
     18	struct da9055 *da9055;
     19	struct input_dev *input;
     20	struct delayed_work work;
     21};
     22
     23static void da9055_onkey_query(struct da9055_onkey *onkey)
     24{
     25	int key_stat;
     26
     27	key_stat = da9055_reg_read(onkey->da9055, DA9055_REG_STATUS_A);
     28	if (key_stat < 0) {
     29		dev_err(onkey->da9055->dev,
     30			"Failed to read onkey event %d\n", key_stat);
     31	} else {
     32		key_stat &= DA9055_NOKEY_STS;
     33		/*
     34		 * Onkey status bit is cleared when onkey button is released.
     35		 */
     36		if (!key_stat) {
     37			input_report_key(onkey->input, KEY_POWER, 0);
     38			input_sync(onkey->input);
     39		}
     40	}
     41
     42	/*
     43	 * Interrupt is generated only when the ONKEY pin is asserted.
     44	 * Hence the deassertion of the pin is simulated through work queue.
     45	 */
     46	if (key_stat)
     47		schedule_delayed_work(&onkey->work, msecs_to_jiffies(10));
     48
     49}
     50
     51static void da9055_onkey_work(struct work_struct *work)
     52{
     53	struct da9055_onkey *onkey = container_of(work, struct da9055_onkey,
     54						  work.work);
     55
     56	da9055_onkey_query(onkey);
     57}
     58
     59static irqreturn_t da9055_onkey_irq(int irq, void *data)
     60{
     61	struct da9055_onkey *onkey = data;
     62
     63	input_report_key(onkey->input, KEY_POWER, 1);
     64	input_sync(onkey->input);
     65
     66	da9055_onkey_query(onkey);
     67
     68	return IRQ_HANDLED;
     69}
     70
     71static int da9055_onkey_probe(struct platform_device *pdev)
     72{
     73	struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent);
     74	struct da9055_onkey *onkey;
     75	struct input_dev *input_dev;
     76	int irq, err;
     77
     78	irq = platform_get_irq_byname(pdev, "ONKEY");
     79	if (irq < 0)
     80		return -EINVAL;
     81
     82	onkey = devm_kzalloc(&pdev->dev, sizeof(*onkey), GFP_KERNEL);
     83	if (!onkey) {
     84		dev_err(&pdev->dev, "Failed to allocate memory\n");
     85		return -ENOMEM;
     86	}
     87
     88	input_dev = input_allocate_device();
     89	if (!input_dev) {
     90		dev_err(&pdev->dev, "Failed to allocate memory\n");
     91		return -ENOMEM;
     92	}
     93
     94	onkey->input = input_dev;
     95	onkey->da9055 = da9055;
     96	input_dev->name = "da9055-onkey";
     97	input_dev->phys = "da9055-onkey/input0";
     98	input_dev->dev.parent = &pdev->dev;
     99
    100	input_dev->evbit[0] = BIT_MASK(EV_KEY);
    101	__set_bit(KEY_POWER, input_dev->keybit);
    102
    103	INIT_DELAYED_WORK(&onkey->work, da9055_onkey_work);
    104
    105	err = request_threaded_irq(irq, NULL, da9055_onkey_irq,
    106				   IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
    107				   "ONKEY", onkey);
    108	if (err < 0) {
    109		dev_err(&pdev->dev,
    110			"Failed to register ONKEY IRQ %d, error = %d\n",
    111			irq, err);
    112		goto err_free_input;
    113	}
    114
    115	err = input_register_device(input_dev);
    116	if (err) {
    117		dev_err(&pdev->dev, "Unable to register input device, %d\n",
    118			err);
    119		goto err_free_irq;
    120	}
    121
    122	platform_set_drvdata(pdev, onkey);
    123
    124	return 0;
    125
    126err_free_irq:
    127	free_irq(irq, onkey);
    128	cancel_delayed_work_sync(&onkey->work);
    129err_free_input:
    130	input_free_device(input_dev);
    131
    132	return err;
    133}
    134
    135static int da9055_onkey_remove(struct platform_device *pdev)
    136{
    137	struct da9055_onkey *onkey = platform_get_drvdata(pdev);
    138	int irq = platform_get_irq_byname(pdev, "ONKEY");
    139
    140	irq = regmap_irq_get_virq(onkey->da9055->irq_data, irq);
    141	free_irq(irq, onkey);
    142	cancel_delayed_work_sync(&onkey->work);
    143	input_unregister_device(onkey->input);
    144
    145	return 0;
    146}
    147
    148static struct platform_driver da9055_onkey_driver = {
    149	.probe	= da9055_onkey_probe,
    150	.remove	= da9055_onkey_remove,
    151	.driver = {
    152		.name	= "da9055-onkey",
    153	},
    154};
    155
    156module_platform_driver(da9055_onkey_driver);
    157
    158MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
    159MODULE_DESCRIPTION("Onkey driver for DA9055");
    160MODULE_LICENSE("GPL");
    161MODULE_ALIAS("platform:da9055-onkey");