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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 | /* * 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/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", }, }; module_platform_driver(cobalt_buttons_driver); |