/* * Cobalt button interface driver. * * Copyright (C) 2007-2008 Yoichi Yuasa <yuasa@linux-mips.org> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <linux/init.h> #include <linux/input-polldev.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 { struct input_polled_dev *poll_dev; unsigned short keymap[ARRAY_SIZE(cobalt_map)]; int count[ARRAY_SIZE(cobalt_map)]; void __iomem *reg; }; static void handle_buttons(struct input_polled_dev *dev) { struct buttons_dev *bdev = dev->private; struct input_dev *input = dev->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_polled_dev *poll_dev; struct input_dev *input; struct resource *res; int error, i; bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL); poll_dev = input_allocate_polled_device(); if (!bdev || !poll_dev) { error = -ENOMEM; goto err_free_mem; } memcpy(bdev->keymap, cobalt_map, sizeof(bdev->keymap)); poll_dev->private = bdev; poll_dev->poll = handle_buttons; poll_dev->poll_interval = BUTTONS_POLL_INTERVAL; input = poll_dev->input; input->name = "Cobalt buttons"; input->phys = "cobalt/input0"; input->id.bustype = BUS_HOST; input->dev.parent = &pdev->dev; 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); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { error = -EBUSY; goto err_free_mem; } bdev->poll_dev = poll_dev; bdev->reg = ioremap(res->start, resource_size(res)); dev_set_drvdata(&pdev->dev, bdev); error = input_register_polled_device(poll_dev); if (error) goto err_iounmap; return 0; err_iounmap: iounmap(bdev->reg); err_free_mem: input_free_polled_device(poll_dev); kfree(bdev); dev_set_drvdata(&pdev->dev, NULL); return error; } static int cobalt_buttons_remove(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct buttons_dev *bdev = dev_get_drvdata(dev); input_unregister_polled_device(bdev->poll_dev); input_free_polled_device(bdev->poll_dev); iounmap(bdev->reg); kfree(bdev); dev_set_drvdata(dev, NULL); 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, .remove = cobalt_buttons_remove, .driver = { .name = "Cobalt buttons", .owner = THIS_MODULE, }, }; module_platform_driver(cobalt_buttons_driver);