Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Cobalt button interface driver. |
| 3 | * |
| 4 | * Copyright (C) 2007 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | */ |
| 20 | #include <linux/init.h> |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame^] | 21 | #include <linux/input-polldev.h> |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 22 | #include <linux/ioport.h> |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/platform_device.h> |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 25 | |
| 26 | #define BUTTONS_POLL_INTERVAL 30 /* msec */ |
| 27 | #define BUTTONS_COUNT_THRESHOLD 3 |
| 28 | #define BUTTONS_STATUS_MASK 0xfe000000 |
| 29 | |
| 30 | struct buttons_dev { |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame^] | 31 | struct input_polled_dev *poll_dev; |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 32 | void __iomem *reg; |
| 33 | }; |
| 34 | |
| 35 | struct buttons_map { |
| 36 | uint32_t mask; |
| 37 | int keycode; |
| 38 | int count; |
| 39 | }; |
| 40 | |
| 41 | static struct buttons_map buttons_map[] = { |
| 42 | { 0x02000000, KEY_RESTART, }, |
| 43 | { 0x04000000, KEY_LEFT, }, |
| 44 | { 0x08000000, KEY_UP, }, |
| 45 | { 0x10000000, KEY_DOWN, }, |
| 46 | { 0x20000000, KEY_RIGHT, }, |
| 47 | { 0x40000000, KEY_ENTER, }, |
| 48 | { 0x80000000, KEY_SELECT, }, |
| 49 | }; |
| 50 | |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame^] | 51 | static void handle_buttons(struct input_polled_dev *dev) |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 52 | { |
| 53 | struct buttons_map *button = buttons_map; |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame^] | 54 | struct buttons_dev *bdev = dev->private; |
| 55 | struct input_dev *input = dev->input; |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 56 | uint32_t status; |
| 57 | int i; |
| 58 | |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 59 | status = readl(bdev->reg); |
| 60 | status = ~status & BUTTONS_STATUS_MASK; |
| 61 | |
| 62 | for (i = 0; i < ARRAY_SIZE(buttons_map); i++) { |
| 63 | if (status & button->mask) { |
| 64 | button->count++; |
| 65 | } else { |
| 66 | if (button->count >= BUTTONS_COUNT_THRESHOLD) { |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame^] | 67 | input_report_key(input, button->keycode, 0); |
| 68 | input_sync(input); |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 69 | } |
| 70 | button->count = 0; |
| 71 | } |
| 72 | |
| 73 | if (button->count == BUTTONS_COUNT_THRESHOLD) { |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame^] | 74 | input_report_key(input, button->keycode, 1); |
| 75 | input_sync(input); |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 76 | } |
| 77 | |
| 78 | button++; |
| 79 | } |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 80 | } |
| 81 | |
| 82 | static int __devinit cobalt_buttons_probe(struct platform_device *pdev) |
| 83 | { |
| 84 | struct buttons_dev *bdev; |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame^] | 85 | struct input_polled_dev *poll_dev; |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 86 | struct input_dev *input; |
| 87 | struct resource *res; |
| 88 | int error, i; |
| 89 | |
| 90 | bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL); |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame^] | 91 | poll_dev = input_allocate_polled_device(); |
| 92 | if (!bdev || !poll_dev) { |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 93 | error = -ENOMEM; |
| 94 | goto err_free_mem; |
| 95 | } |
| 96 | |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame^] | 97 | poll_dev->private = bdev; |
| 98 | poll_dev->poll = handle_buttons; |
| 99 | poll_dev->poll_interval = BUTTONS_POLL_INTERVAL; |
| 100 | |
| 101 | input = poll_dev->input; |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 102 | input->name = "Cobalt buttons"; |
| 103 | input->phys = "cobalt/input0"; |
| 104 | input->id.bustype = BUS_HOST; |
| 105 | input->cdev.dev = &pdev->dev; |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 106 | |
| 107 | input->evbit[0] = BIT(EV_KEY); |
| 108 | for (i = 0; i < ARRAY_SIZE(buttons_map); i++) { |
| 109 | set_bit(buttons_map[i].keycode, input->keybit); |
| 110 | buttons_map[i].count = 0; |
| 111 | } |
| 112 | |
| 113 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 114 | if (!res) { |
| 115 | error = -EBUSY; |
| 116 | goto err_free_mem; |
| 117 | } |
| 118 | |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame^] | 119 | bdev->poll_dev = poll_dev; |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 120 | bdev->reg = ioremap(res->start, res->end - res->start + 1); |
| 121 | dev_set_drvdata(&pdev->dev, bdev); |
| 122 | |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame^] | 123 | error = input_register_polled_device(poll_dev); |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 124 | if (error) |
| 125 | goto err_iounmap; |
| 126 | |
| 127 | return 0; |
| 128 | |
| 129 | err_iounmap: |
| 130 | iounmap(bdev->reg); |
| 131 | err_free_mem: |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame^] | 132 | input_free_polled_device(poll_dev); |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 133 | kfree(bdev); |
| 134 | dev_set_drvdata(&pdev->dev, NULL); |
| 135 | return error; |
| 136 | } |
| 137 | |
| 138 | static int __devexit cobalt_buttons_remove(struct platform_device *pdev) |
| 139 | { |
| 140 | struct device *dev = &pdev->dev; |
| 141 | struct buttons_dev *bdev = dev_get_drvdata(dev); |
| 142 | |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame^] | 143 | input_unregister_polled_device(bdev->poll_dev); |
| 144 | input_free_polled_device(bdev->poll_dev); |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 145 | iounmap(bdev->reg); |
| 146 | kfree(bdev); |
| 147 | dev_set_drvdata(dev, NULL); |
| 148 | |
| 149 | return 0; |
| 150 | } |
| 151 | |
| 152 | static struct platform_driver cobalt_buttons_driver = { |
| 153 | .probe = cobalt_buttons_probe, |
| 154 | .remove = __devexit_p(cobalt_buttons_remove), |
| 155 | .driver = { |
| 156 | .name = "Cobalt buttons", |
| 157 | .owner = THIS_MODULE, |
| 158 | }, |
| 159 | }; |
| 160 | |
| 161 | static int __init cobalt_buttons_init(void) |
| 162 | { |
Dmitry Torokhov | d0a0515 | 2007-04-12 01:36:12 -0400 | [diff] [blame] | 163 | return platform_driver_register(&cobalt_buttons_driver); |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 164 | } |
| 165 | |
| 166 | static void __exit cobalt_buttons_exit(void) |
| 167 | { |
| 168 | platform_driver_unregister(&cobalt_buttons_driver); |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 169 | } |
| 170 | |
| 171 | module_init(cobalt_buttons_init); |
| 172 | module_exit(cobalt_buttons_exit); |