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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Cobalt button interface driver.
*
* Copyright (C) 2007-2008 Yoichi Yuasa <yuasa@linux-mips.org>
*/
#include <linux/input.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#define BUTTONS_POLL_INTERVAL 30 /* msec */
#define BUTTONS_COUNT_THRESHOLD 3
#define BUTTONS_STATUS_MASK 0xfe000000
static const unsigned short cobalt_map[] = {
KEY_RESERVED,
KEY_RESTART,
KEY_LEFT,
KEY_UP,
KEY_DOWN,
KEY_RIGHT,
KEY_ENTER,
KEY_SELECT
};
struct buttons_dev {
unsigned short keymap[ARRAY_SIZE(cobalt_map)];
int count[ARRAY_SIZE(cobalt_map)];
void __iomem *reg;
};
static void handle_buttons(struct input_dev *input)
{
struct buttons_dev *bdev = input_get_drvdata(input);
uint32_t status;
int i;
status = ~readl(bdev->reg) >> 24;
for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) {
if (status & (1U << i)) {
if (++bdev->count[i] == BUTTONS_COUNT_THRESHOLD) {
input_event(input, EV_MSC, MSC_SCAN, i);
input_report_key(input, bdev->keymap[i], 1);
input_sync(input);
}
} else {
if (bdev->count[i] >= BUTTONS_COUNT_THRESHOLD) {
input_event(input, EV_MSC, MSC_SCAN, i);
input_report_key(input, bdev->keymap[i], 0);
input_sync(input);
}
bdev->count[i] = 0;
}
}
}
static int cobalt_buttons_probe(struct platform_device *pdev)
{
struct buttons_dev *bdev;
struct input_dev *input;
struct resource *res;
int error, i;
bdev = devm_kzalloc(&pdev->dev, sizeof(*bdev), GFP_KERNEL);
if (!bdev)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -EBUSY;
bdev->reg = devm_ioremap(&pdev->dev, res->start, resource_size(res));
if (!bdev->reg)
return -ENOMEM;
memcpy(bdev->keymap, cobalt_map, sizeof(bdev->keymap));
input = devm_input_allocate_device(&pdev->dev);
if (!input)
return -ENOMEM;
input_set_drvdata(input, bdev);
input->name = "Cobalt buttons";
input->phys = "cobalt/input0";
input->id.bustype = BUS_HOST;
input->keycode = bdev->keymap;
input->keycodemax = ARRAY_SIZE(bdev->keymap);
input->keycodesize = sizeof(unsigned short);
input_set_capability(input, EV_MSC, MSC_SCAN);
__set_bit(EV_KEY, input->evbit);
for (i = 0; i < ARRAY_SIZE(cobalt_map); i++)
__set_bit(bdev->keymap[i], input->keybit);
__clear_bit(KEY_RESERVED, input->keybit);
error = input_setup_polling(input, handle_buttons);
if (error)
return error;
input_set_poll_interval(input, BUTTONS_POLL_INTERVAL);
error = input_register_device(input);
if (error)
return error;
return 0;
}
MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>");
MODULE_DESCRIPTION("Cobalt button interface driver");
MODULE_LICENSE("GPL");
/* work with hotplug and coldplug */
MODULE_ALIAS("platform:Cobalt buttons");
static struct platform_driver cobalt_buttons_driver = {
.probe = cobalt_buttons_probe,
.driver = {
.name = "Cobalt buttons",
},
};
module_platform_driver(cobalt_buttons_driver);
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