| /* |
| * 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); |
| 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); |
| |
| 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); |