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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cobalt_btns.c (3017B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 *  Cobalt button interface driver.
      4 *
      5 *  Copyright (C) 2007-2008  Yoichi Yuasa <yuasa@linux-mips.org>
      6 */
      7#include <linux/input.h>
      8#include <linux/io.h>
      9#include <linux/ioport.h>
     10#include <linux/module.h>
     11#include <linux/platform_device.h>
     12#include <linux/slab.h>
     13
     14#define BUTTONS_POLL_INTERVAL	30	/* msec */
     15#define BUTTONS_COUNT_THRESHOLD	3
     16#define BUTTONS_STATUS_MASK	0xfe000000
     17
     18static const unsigned short cobalt_map[] = {
     19	KEY_RESERVED,
     20	KEY_RESTART,
     21	KEY_LEFT,
     22	KEY_UP,
     23	KEY_DOWN,
     24	KEY_RIGHT,
     25	KEY_ENTER,
     26	KEY_SELECT
     27};
     28
     29struct buttons_dev {
     30	unsigned short keymap[ARRAY_SIZE(cobalt_map)];
     31	int count[ARRAY_SIZE(cobalt_map)];
     32	void __iomem *reg;
     33};
     34
     35static void handle_buttons(struct input_dev *input)
     36{
     37	struct buttons_dev *bdev = input_get_drvdata(input);
     38	uint32_t status;
     39	int i;
     40
     41	status = ~readl(bdev->reg) >> 24;
     42
     43	for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) {
     44		if (status & (1U << i)) {
     45			if (++bdev->count[i] == BUTTONS_COUNT_THRESHOLD) {
     46				input_event(input, EV_MSC, MSC_SCAN, i);
     47				input_report_key(input, bdev->keymap[i], 1);
     48				input_sync(input);
     49			}
     50		} else {
     51			if (bdev->count[i] >= BUTTONS_COUNT_THRESHOLD) {
     52				input_event(input, EV_MSC, MSC_SCAN, i);
     53				input_report_key(input, bdev->keymap[i], 0);
     54				input_sync(input);
     55			}
     56			bdev->count[i] = 0;
     57		}
     58	}
     59}
     60
     61static int cobalt_buttons_probe(struct platform_device *pdev)
     62{
     63	struct buttons_dev *bdev;
     64	struct input_dev *input;
     65	struct resource *res;
     66	int error, i;
     67
     68	bdev = devm_kzalloc(&pdev->dev, sizeof(*bdev), GFP_KERNEL);
     69	if (!bdev)
     70		return -ENOMEM;
     71
     72	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
     73	if (!res)
     74		return -EBUSY;
     75
     76	bdev->reg = devm_ioremap(&pdev->dev, res->start, resource_size(res));
     77	if (!bdev->reg)
     78		return -ENOMEM;
     79
     80	memcpy(bdev->keymap, cobalt_map, sizeof(bdev->keymap));
     81
     82	input = devm_input_allocate_device(&pdev->dev);
     83	if (!input)
     84		return -ENOMEM;
     85
     86	input_set_drvdata(input, bdev);
     87
     88	input->name = "Cobalt buttons";
     89	input->phys = "cobalt/input0";
     90	input->id.bustype = BUS_HOST;
     91
     92	input->keycode = bdev->keymap;
     93	input->keycodemax = ARRAY_SIZE(bdev->keymap);
     94	input->keycodesize = sizeof(unsigned short);
     95
     96	input_set_capability(input, EV_MSC, MSC_SCAN);
     97	__set_bit(EV_KEY, input->evbit);
     98	for (i = 0; i < ARRAY_SIZE(cobalt_map); i++)
     99		__set_bit(bdev->keymap[i], input->keybit);
    100	__clear_bit(KEY_RESERVED, input->keybit);
    101
    102
    103	error = input_setup_polling(input, handle_buttons);
    104	if (error)
    105		return error;
    106
    107	input_set_poll_interval(input, BUTTONS_POLL_INTERVAL);
    108
    109	error = input_register_device(input);
    110	if (error)
    111		return error;
    112
    113	return 0;
    114}
    115
    116MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>");
    117MODULE_DESCRIPTION("Cobalt button interface driver");
    118MODULE_LICENSE("GPL");
    119/* work with hotplug and coldplug */
    120MODULE_ALIAS("platform:Cobalt buttons");
    121
    122static struct platform_driver cobalt_buttons_driver = {
    123	.probe	= cobalt_buttons_probe,
    124	.driver	= {
    125		.name	= "Cobalt buttons",
    126	},
    127};
    128module_platform_driver(cobalt_buttons_driver);