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