1bebb8a2bSYoichi Yuasa /* 2bebb8a2bSYoichi Yuasa * Cobalt button interface driver. 3bebb8a2bSYoichi Yuasa * 4ada8e951SYoichi Yuasa * Copyright (C) 2007-2008 Yoichi Yuasa <yuasa@linux-mips.org> 5bebb8a2bSYoichi Yuasa * 6bebb8a2bSYoichi Yuasa * This program is free software; you can redistribute it and/or modify 7bebb8a2bSYoichi Yuasa * it under the terms of the GNU General Public License as published by 8bebb8a2bSYoichi Yuasa * the Free Software Foundation; either version 2 of the License, or 9bebb8a2bSYoichi Yuasa * (at your option) any later version. 10bebb8a2bSYoichi Yuasa * 11bebb8a2bSYoichi Yuasa * This program is distributed in the hope that it will be useful, 12bebb8a2bSYoichi Yuasa * but WITHOUT ANY WARRANTY; without even the implied warranty of 13bebb8a2bSYoichi Yuasa * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14bebb8a2bSYoichi Yuasa * GNU General Public License for more details. 15bebb8a2bSYoichi Yuasa * 16bebb8a2bSYoichi Yuasa * You should have received a copy of the GNU General Public License 17bebb8a2bSYoichi Yuasa * along with this program; if not, write to the Free Software 18bebb8a2bSYoichi Yuasa * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19bebb8a2bSYoichi Yuasa */ 20bebb8a2bSYoichi Yuasa #include <linux/init.h> 213d29cdffSDmitry Torokhov #include <linux/input-polldev.h> 22bebb8a2bSYoichi Yuasa #include <linux/ioport.h> 23bebb8a2bSYoichi Yuasa #include <linux/module.h> 24bebb8a2bSYoichi Yuasa #include <linux/platform_device.h> 255a0e3ad6STejun Heo #include <linux/slab.h> 26bebb8a2bSYoichi Yuasa 27bebb8a2bSYoichi Yuasa #define BUTTONS_POLL_INTERVAL 30 /* msec */ 28bebb8a2bSYoichi Yuasa #define BUTTONS_COUNT_THRESHOLD 3 29bebb8a2bSYoichi Yuasa #define BUTTONS_STATUS_MASK 0xfe000000 30bebb8a2bSYoichi Yuasa 31b037b08eSDmitry Torokhov static const unsigned short cobalt_map[] = { 32b037b08eSDmitry Torokhov KEY_RESERVED, 33b037b08eSDmitry Torokhov KEY_RESTART, 34b037b08eSDmitry Torokhov KEY_LEFT, 35b037b08eSDmitry Torokhov KEY_UP, 36b037b08eSDmitry Torokhov KEY_DOWN, 37b037b08eSDmitry Torokhov KEY_RIGHT, 38b037b08eSDmitry Torokhov KEY_ENTER, 39b037b08eSDmitry Torokhov KEY_SELECT 40b037b08eSDmitry Torokhov }; 41b037b08eSDmitry Torokhov 42bebb8a2bSYoichi Yuasa struct buttons_dev { 433d29cdffSDmitry Torokhov struct input_polled_dev *poll_dev; 44b037b08eSDmitry Torokhov unsigned short keymap[ARRAY_SIZE(cobalt_map)]; 45b037b08eSDmitry Torokhov int count[ARRAY_SIZE(cobalt_map)]; 46bebb8a2bSYoichi Yuasa void __iomem *reg; 47bebb8a2bSYoichi Yuasa }; 48bebb8a2bSYoichi Yuasa 493d29cdffSDmitry Torokhov static void handle_buttons(struct input_polled_dev *dev) 50bebb8a2bSYoichi Yuasa { 513d29cdffSDmitry Torokhov struct buttons_dev *bdev = dev->private; 523d29cdffSDmitry Torokhov struct input_dev *input = dev->input; 53bebb8a2bSYoichi Yuasa uint32_t status; 54bebb8a2bSYoichi Yuasa int i; 55bebb8a2bSYoichi Yuasa 56b037b08eSDmitry Torokhov status = ~readl(bdev->reg) >> 24; 57bebb8a2bSYoichi Yuasa 58b037b08eSDmitry Torokhov for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) { 593c514387SYoichi Yuasa if (status & (1U << i)) { 60b037b08eSDmitry Torokhov if (++bdev->count[i] == BUTTONS_COUNT_THRESHOLD) { 61b037b08eSDmitry Torokhov input_event(input, EV_MSC, MSC_SCAN, i); 62b037b08eSDmitry Torokhov input_report_key(input, bdev->keymap[i], 1); 63b037b08eSDmitry Torokhov input_sync(input); 64b037b08eSDmitry Torokhov } 65bebb8a2bSYoichi Yuasa } else { 66b037b08eSDmitry Torokhov if (bdev->count[i] >= BUTTONS_COUNT_THRESHOLD) { 67b037b08eSDmitry Torokhov input_event(input, EV_MSC, MSC_SCAN, i); 68b037b08eSDmitry Torokhov input_report_key(input, bdev->keymap[i], 0); 693d29cdffSDmitry Torokhov input_sync(input); 70bebb8a2bSYoichi Yuasa } 71b037b08eSDmitry Torokhov bdev->count[i] = 0; 72bebb8a2bSYoichi Yuasa } 73bebb8a2bSYoichi Yuasa } 74bebb8a2bSYoichi Yuasa } 75bebb8a2bSYoichi Yuasa 76bebb8a2bSYoichi Yuasa static int __devinit cobalt_buttons_probe(struct platform_device *pdev) 77bebb8a2bSYoichi Yuasa { 78bebb8a2bSYoichi Yuasa struct buttons_dev *bdev; 793d29cdffSDmitry Torokhov struct input_polled_dev *poll_dev; 80bebb8a2bSYoichi Yuasa struct input_dev *input; 81bebb8a2bSYoichi Yuasa struct resource *res; 82bebb8a2bSYoichi Yuasa int error, i; 83bebb8a2bSYoichi Yuasa 84bebb8a2bSYoichi Yuasa bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL); 853d29cdffSDmitry Torokhov poll_dev = input_allocate_polled_device(); 863d29cdffSDmitry Torokhov if (!bdev || !poll_dev) { 87bebb8a2bSYoichi Yuasa error = -ENOMEM; 88bebb8a2bSYoichi Yuasa goto err_free_mem; 89bebb8a2bSYoichi Yuasa } 90bebb8a2bSYoichi Yuasa 91b037b08eSDmitry Torokhov memcpy(bdev->keymap, cobalt_map, sizeof(bdev->keymap)); 92b037b08eSDmitry Torokhov 933d29cdffSDmitry Torokhov poll_dev->private = bdev; 943d29cdffSDmitry Torokhov poll_dev->poll = handle_buttons; 953d29cdffSDmitry Torokhov poll_dev->poll_interval = BUTTONS_POLL_INTERVAL; 963d29cdffSDmitry Torokhov 973d29cdffSDmitry Torokhov input = poll_dev->input; 98bebb8a2bSYoichi Yuasa input->name = "Cobalt buttons"; 99bebb8a2bSYoichi Yuasa input->phys = "cobalt/input0"; 100bebb8a2bSYoichi Yuasa input->id.bustype = BUS_HOST; 1013c514387SYoichi Yuasa input->dev.parent = &pdev->dev; 102bebb8a2bSYoichi Yuasa 1033c514387SYoichi Yuasa input->keycode = bdev->keymap; 1043c514387SYoichi Yuasa input->keycodemax = ARRAY_SIZE(bdev->keymap); 105b037b08eSDmitry Torokhov input->keycodesize = sizeof(unsigned short); 106b037b08eSDmitry Torokhov 107b037b08eSDmitry Torokhov input_set_capability(input, EV_MSC, MSC_SCAN); 108b037b08eSDmitry Torokhov __set_bit(EV_KEY, input->evbit); 1093c514387SYoichi Yuasa for (i = 0; i < ARRAY_SIZE(cobalt_map); i++) 1103c514387SYoichi Yuasa __set_bit(bdev->keymap[i], input->keybit); 111b037b08eSDmitry Torokhov __clear_bit(KEY_RESERVED, input->keybit); 112bebb8a2bSYoichi Yuasa 113bebb8a2bSYoichi Yuasa res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 114bebb8a2bSYoichi Yuasa if (!res) { 115bebb8a2bSYoichi Yuasa error = -EBUSY; 116bebb8a2bSYoichi Yuasa goto err_free_mem; 117bebb8a2bSYoichi Yuasa } 118bebb8a2bSYoichi Yuasa 1193d29cdffSDmitry Torokhov bdev->poll_dev = poll_dev; 12072398e4bSJulia Lawall bdev->reg = ioremap(res->start, resource_size(res)); 121bebb8a2bSYoichi Yuasa dev_set_drvdata(&pdev->dev, bdev); 122bebb8a2bSYoichi Yuasa 1233d29cdffSDmitry Torokhov error = input_register_polled_device(poll_dev); 124bebb8a2bSYoichi Yuasa if (error) 125bebb8a2bSYoichi Yuasa goto err_iounmap; 126bebb8a2bSYoichi Yuasa 127bebb8a2bSYoichi Yuasa return 0; 128bebb8a2bSYoichi Yuasa 129bebb8a2bSYoichi Yuasa err_iounmap: 130bebb8a2bSYoichi Yuasa iounmap(bdev->reg); 131bebb8a2bSYoichi Yuasa err_free_mem: 1323d29cdffSDmitry Torokhov input_free_polled_device(poll_dev); 133bebb8a2bSYoichi Yuasa kfree(bdev); 134bebb8a2bSYoichi Yuasa dev_set_drvdata(&pdev->dev, NULL); 135bebb8a2bSYoichi Yuasa return error; 136bebb8a2bSYoichi Yuasa } 137bebb8a2bSYoichi Yuasa 138bebb8a2bSYoichi Yuasa static int __devexit cobalt_buttons_remove(struct platform_device *pdev) 139bebb8a2bSYoichi Yuasa { 140bebb8a2bSYoichi Yuasa struct device *dev = &pdev->dev; 141bebb8a2bSYoichi Yuasa struct buttons_dev *bdev = dev_get_drvdata(dev); 142bebb8a2bSYoichi Yuasa 1433d29cdffSDmitry Torokhov input_unregister_polled_device(bdev->poll_dev); 1443d29cdffSDmitry Torokhov input_free_polled_device(bdev->poll_dev); 145bebb8a2bSYoichi Yuasa iounmap(bdev->reg); 146bebb8a2bSYoichi Yuasa kfree(bdev); 147bebb8a2bSYoichi Yuasa dev_set_drvdata(dev, NULL); 148bebb8a2bSYoichi Yuasa 149bebb8a2bSYoichi Yuasa return 0; 150bebb8a2bSYoichi Yuasa } 151bebb8a2bSYoichi Yuasa 152ada8e951SYoichi Yuasa MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>"); 15326135ed3SMartin Michlmayr MODULE_DESCRIPTION("Cobalt button interface driver"); 15426135ed3SMartin Michlmayr MODULE_LICENSE("GPL"); 155d7b5247bSKay Sievers /* work with hotplug and coldplug */ 156d7b5247bSKay Sievers MODULE_ALIAS("platform:Cobalt buttons"); 157d7b5247bSKay Sievers 158bebb8a2bSYoichi Yuasa static struct platform_driver cobalt_buttons_driver = { 159bebb8a2bSYoichi Yuasa .probe = cobalt_buttons_probe, 160bebb8a2bSYoichi Yuasa .remove = __devexit_p(cobalt_buttons_remove), 161bebb8a2bSYoichi Yuasa .driver = { 162bebb8a2bSYoichi Yuasa .name = "Cobalt buttons", 163bebb8a2bSYoichi Yuasa .owner = THIS_MODULE, 164bebb8a2bSYoichi Yuasa }, 165bebb8a2bSYoichi Yuasa }; 166bebb8a2bSYoichi Yuasa 167bebb8a2bSYoichi Yuasa static int __init cobalt_buttons_init(void) 168bebb8a2bSYoichi Yuasa { 169d0a0515fSDmitry Torokhov return platform_driver_register(&cobalt_buttons_driver); 170bebb8a2bSYoichi Yuasa } 171bebb8a2bSYoichi Yuasa 172bebb8a2bSYoichi Yuasa static void __exit cobalt_buttons_exit(void) 173bebb8a2bSYoichi Yuasa { 174bebb8a2bSYoichi Yuasa platform_driver_unregister(&cobalt_buttons_driver); 175bebb8a2bSYoichi Yuasa } 176bebb8a2bSYoichi Yuasa 177bebb8a2bSYoichi Yuasa module_init(cobalt_buttons_init); 178bebb8a2bSYoichi Yuasa module_exit(cobalt_buttons_exit); 179