// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* SGI Volume Button interface driver
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*
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* Copyright (C) 2008 Thomas Bogendoerfer <tsbogend@alpha.franken.de>
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*/
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#include <linux/input.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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#ifdef CONFIG_SGI_IP22
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#include <asm/sgi/ioc.h>
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static inline u8 button_status(void)
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{
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u8 status;
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status = readb(&sgioc->panel) ^ 0xa0;
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return ((status & 0x80) >> 6) | ((status & 0x20) >> 5);
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}
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#endif
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#ifdef CONFIG_SGI_IP32
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#include <asm/ip32/mace.h>
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static inline u8 button_status(void)
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{
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u64 status;
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status = readq(&mace->perif.audio.control);
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writeq(status & ~(3U << 23), &mace->perif.audio.control);
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return (status >> 23) & 3;
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}
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#endif
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#define BUTTONS_POLL_INTERVAL 30 /* msec */
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#define BUTTONS_COUNT_THRESHOLD 3
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static const unsigned short sgi_map[] = {
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KEY_VOLUMEDOWN,
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KEY_VOLUMEUP
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};
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struct buttons_dev {
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unsigned short keymap[ARRAY_SIZE(sgi_map)];
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int count[ARRAY_SIZE(sgi_map)];
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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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u8 status;
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int i;
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status = button_status();
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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 sgi_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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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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input = devm_input_allocate_device(&pdev->dev);
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if (!input)
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return -ENOMEM;
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memcpy(bdev->keymap, sgi_map, sizeof(bdev->keymap));
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input_set_drvdata(input, bdev);
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input->name = "SGI buttons";
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input->phys = "sgi/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(sgi_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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static struct platform_driver sgi_buttons_driver = {
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.probe = sgi_buttons_probe,
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.driver = {
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.name = "sgibtns",
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},
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};
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module_platform_driver(sgi_buttons_driver);
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MODULE_LICENSE("GPL");
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