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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max77650-onkey.c (3171B)

      1// SPDX-License-Identifier: GPL-2.0
      2//
      3// Copyright (C) 2018 BayLibre SAS
      4// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
      5//
      6// ONKEY driver for MAXIM 77650/77651 charger/power-supply.
      7
      8#include <linux/i2c.h>
      9#include <linux/input.h>
     10#include <linux/interrupt.h>
     11#include <linux/mfd/max77650.h>
     12#include <linux/module.h>
     13#include <linux/platform_device.h>
     14#include <linux/regmap.h>
     15
     16#define MAX77650_ONKEY_MODE_MASK	BIT(3)
     17#define MAX77650_ONKEY_MODE_PUSH	0x00
     18#define MAX77650_ONKEY_MODE_SLIDE	BIT(3)
     19
     20struct max77650_onkey {
     21	struct input_dev *input;
     22	unsigned int code;
     23};
     24
     25static irqreturn_t max77650_onkey_falling(int irq, void *data)
     26{
     27	struct max77650_onkey *onkey = data;
     28
     29	input_report_key(onkey->input, onkey->code, 0);
     30	input_sync(onkey->input);
     31
     32	return IRQ_HANDLED;
     33}
     34
     35static irqreturn_t max77650_onkey_rising(int irq, void *data)
     36{
     37	struct max77650_onkey *onkey = data;
     38
     39	input_report_key(onkey->input, onkey->code, 1);
     40	input_sync(onkey->input);
     41
     42	return IRQ_HANDLED;
     43}
     44
     45static int max77650_onkey_probe(struct platform_device *pdev)
     46{
     47	int irq_r, irq_f, error, mode;
     48	struct max77650_onkey *onkey;
     49	struct device *dev, *parent;
     50	struct regmap *map;
     51	unsigned int type;
     52
     53	dev = &pdev->dev;
     54	parent = dev->parent;
     55
     56	map = dev_get_regmap(parent, NULL);
     57	if (!map)
     58		return -ENODEV;
     59
     60	onkey = devm_kzalloc(dev, sizeof(*onkey), GFP_KERNEL);
     61	if (!onkey)
     62		return -ENOMEM;
     63
     64	error = device_property_read_u32(dev, "linux,code", &onkey->code);
     65	if (error)
     66		onkey->code = KEY_POWER;
     67
     68	if (device_property_read_bool(dev, "maxim,onkey-slide")) {
     69		mode = MAX77650_ONKEY_MODE_SLIDE;
     70		type = EV_SW;
     71	} else {
     72		mode = MAX77650_ONKEY_MODE_PUSH;
     73		type = EV_KEY;
     74	}
     75
     76	error = regmap_update_bits(map, MAX77650_REG_CNFG_GLBL,
     77				   MAX77650_ONKEY_MODE_MASK, mode);
     78	if (error)
     79		return error;
     80
     81	irq_f = platform_get_irq_byname(pdev, "nEN_F");
     82	if (irq_f < 0)
     83		return irq_f;
     84
     85	irq_r = platform_get_irq_byname(pdev, "nEN_R");
     86	if (irq_r < 0)
     87		return irq_r;
     88
     89	onkey->input = devm_input_allocate_device(dev);
     90	if (!onkey->input)
     91		return -ENOMEM;
     92
     93	onkey->input->name = "max77650_onkey";
     94	onkey->input->phys = "max77650_onkey/input0";
     95	onkey->input->id.bustype = BUS_I2C;
     96	input_set_capability(onkey->input, type, onkey->code);
     97
     98	error = devm_request_any_context_irq(dev, irq_f, max77650_onkey_falling,
     99					     IRQF_ONESHOT, "onkey-down", onkey);
    100	if (error < 0)
    101		return error;
    102
    103	error = devm_request_any_context_irq(dev, irq_r, max77650_onkey_rising,
    104					     IRQF_ONESHOT, "onkey-up", onkey);
    105	if (error < 0)
    106		return error;
    107
    108	return input_register_device(onkey->input);
    109}
    110
    111static const struct of_device_id max77650_onkey_of_match[] = {
    112	{ .compatible = "maxim,max77650-onkey" },
    113	{ }
    114};
    115MODULE_DEVICE_TABLE(of, max77650_onkey_of_match);
    116
    117static struct platform_driver max77650_onkey_driver = {
    118	.driver = {
    119		.name = "max77650-onkey",
    120		.of_match_table = max77650_onkey_of_match,
    121	},
    122	.probe = max77650_onkey_probe,
    123};
    124module_platform_driver(max77650_onkey_driver);
    125
    126MODULE_DESCRIPTION("MAXIM 77650/77651 ONKEY driver");
    127MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
    128MODULE_LICENSE("GPL v2");
    129MODULE_ALIAS("platform:max77650-onkey");