2007-02-18 14:50:18 +08:00
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/*
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* Cobalt button interface driver.
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*
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* Copyright (C) 2007 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/init.h>
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2007-04-30 11:43:06 +08:00
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#include <linux/input-polldev.h>
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2007-02-18 14:50:18 +08:00
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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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#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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struct buttons_dev {
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2007-04-30 11:43:06 +08:00
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struct input_polled_dev *poll_dev;
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2007-02-18 14:50:18 +08:00
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void __iomem *reg;
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};
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struct buttons_map {
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uint32_t mask;
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int keycode;
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int count;
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};
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static struct buttons_map buttons_map[] = {
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{ 0x02000000, KEY_RESTART, },
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{ 0x04000000, KEY_LEFT, },
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{ 0x08000000, KEY_UP, },
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{ 0x10000000, KEY_DOWN, },
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{ 0x20000000, KEY_RIGHT, },
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{ 0x40000000, KEY_ENTER, },
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{ 0x80000000, KEY_SELECT, },
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};
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2007-04-30 11:43:06 +08:00
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static void handle_buttons(struct input_polled_dev *dev)
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2007-02-18 14:50:18 +08:00
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{
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struct buttons_map *button = buttons_map;
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2007-04-30 11:43:06 +08:00
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struct buttons_dev *bdev = dev->private;
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struct input_dev *input = dev->input;
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2007-02-18 14:50:18 +08:00
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uint32_t status;
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int i;
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status = readl(bdev->reg);
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status = ~status & BUTTONS_STATUS_MASK;
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for (i = 0; i < ARRAY_SIZE(buttons_map); i++) {
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if (status & button->mask) {
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button->count++;
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} else {
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if (button->count >= BUTTONS_COUNT_THRESHOLD) {
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2007-04-30 11:43:06 +08:00
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input_report_key(input, button->keycode, 0);
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input_sync(input);
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2007-02-18 14:50:18 +08:00
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}
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button->count = 0;
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}
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if (button->count == BUTTONS_COUNT_THRESHOLD) {
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2007-04-30 11:43:06 +08:00
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input_report_key(input, button->keycode, 1);
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input_sync(input);
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2007-02-18 14:50:18 +08:00
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}
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button++;
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}
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}
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static int __devinit cobalt_buttons_probe(struct platform_device *pdev)
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{
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struct buttons_dev *bdev;
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2007-04-30 11:43:06 +08:00
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struct input_polled_dev *poll_dev;
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2007-02-18 14:50:18 +08:00
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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 = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL);
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2007-04-30 11:43:06 +08:00
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poll_dev = input_allocate_polled_device();
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if (!bdev || !poll_dev) {
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2007-02-18 14:50:18 +08:00
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error = -ENOMEM;
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goto err_free_mem;
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}
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2007-04-30 11:43:06 +08:00
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poll_dev->private = bdev;
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poll_dev->poll = handle_buttons;
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poll_dev->poll_interval = BUTTONS_POLL_INTERVAL;
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input = poll_dev->input;
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2007-02-18 14:50:18 +08:00
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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->cdev.dev = &pdev->dev;
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input->evbit[0] = BIT(EV_KEY);
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for (i = 0; i < ARRAY_SIZE(buttons_map); i++) {
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set_bit(buttons_map[i].keycode, input->keybit);
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buttons_map[i].count = 0;
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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error = -EBUSY;
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goto err_free_mem;
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}
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2007-04-30 11:43:06 +08:00
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bdev->poll_dev = poll_dev;
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2007-02-18 14:50:18 +08:00
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bdev->reg = ioremap(res->start, res->end - res->start + 1);
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dev_set_drvdata(&pdev->dev, bdev);
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2007-04-30 11:43:06 +08:00
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error = input_register_polled_device(poll_dev);
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2007-02-18 14:50:18 +08:00
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if (error)
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goto err_iounmap;
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return 0;
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err_iounmap:
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iounmap(bdev->reg);
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err_free_mem:
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2007-04-30 11:43:06 +08:00
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input_free_polled_device(poll_dev);
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2007-02-18 14:50:18 +08:00
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kfree(bdev);
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dev_set_drvdata(&pdev->dev, NULL);
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return error;
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}
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static int __devexit cobalt_buttons_remove(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct buttons_dev *bdev = dev_get_drvdata(dev);
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2007-04-30 11:43:06 +08:00
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input_unregister_polled_device(bdev->poll_dev);
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input_free_polled_device(bdev->poll_dev);
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2007-02-18 14:50:18 +08:00
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iounmap(bdev->reg);
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kfree(bdev);
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dev_set_drvdata(dev, NULL);
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return 0;
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}
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static struct platform_driver cobalt_buttons_driver = {
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.probe = cobalt_buttons_probe,
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.remove = __devexit_p(cobalt_buttons_remove),
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.driver = {
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.name = "Cobalt buttons",
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.owner = THIS_MODULE,
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},
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};
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static int __init cobalt_buttons_init(void)
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{
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2007-04-12 13:36:12 +08:00
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return platform_driver_register(&cobalt_buttons_driver);
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2007-02-18 14:50:18 +08:00
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}
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static void __exit cobalt_buttons_exit(void)
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{
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platform_driver_unregister(&cobalt_buttons_driver);
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}
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module_init(cobalt_buttons_init);
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module_exit(cobalt_buttons_exit);
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