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 | |
Dmitry Torokhov | b037b08 | 2007-11-04 00:41:36 -0400 | [diff] [blame^] | 30 | static const unsigned short cobalt_map[] = { |
| 31 | KEY_RESERVED, |
| 32 | KEY_RESTART, |
| 33 | KEY_LEFT, |
| 34 | KEY_UP, |
| 35 | KEY_DOWN, |
| 36 | KEY_RIGHT, |
| 37 | KEY_ENTER, |
| 38 | KEY_SELECT |
| 39 | }; |
| 40 | |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 41 | struct buttons_dev { |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame] | 42 | struct input_polled_dev *poll_dev; |
Dmitry Torokhov | b037b08 | 2007-11-04 00:41:36 -0400 | [diff] [blame^] | 43 | unsigned short keymap[ARRAY_SIZE(cobalt_map)]; |
| 44 | int count[ARRAY_SIZE(cobalt_map)]; |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 45 | void __iomem *reg; |
| 46 | }; |
| 47 | |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame] | 48 | static void handle_buttons(struct input_polled_dev *dev) |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 49 | { |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame] | 50 | struct buttons_dev *bdev = dev->private; |
| 51 | struct input_dev *input = dev->input; |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 52 | uint32_t status; |
| 53 | int i; |
| 54 | |
Dmitry Torokhov | b037b08 | 2007-11-04 00:41:36 -0400 | [diff] [blame^] | 55 | status = ~readl(bdev->reg) >> 24; |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 56 | |
Dmitry Torokhov | b037b08 | 2007-11-04 00:41:36 -0400 | [diff] [blame^] | 57 | for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) { |
| 58 | if (status & (1UL << i)) { |
| 59 | if (++bdev->count[i] == BUTTONS_COUNT_THRESHOLD) { |
| 60 | input_event(input, EV_MSC, MSC_SCAN, i); |
| 61 | input_report_key(input, bdev->keymap[i], 1); |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame] | 62 | input_sync(input); |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 63 | } |
Dmitry Torokhov | b037b08 | 2007-11-04 00:41:36 -0400 | [diff] [blame^] | 64 | } else { |
| 65 | if (bdev->count[i] >= BUTTONS_COUNT_THRESHOLD) { |
| 66 | input_event(input, EV_MSC, MSC_SCAN, i); |
| 67 | input_report_key(input, bdev->keymap[i], 0); |
| 68 | input_sync(input); |
| 69 | } |
| 70 | bdev->count[i] = 0; |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 71 | } |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 72 | } |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 73 | } |
| 74 | |
| 75 | static int __devinit cobalt_buttons_probe(struct platform_device *pdev) |
| 76 | { |
| 77 | struct buttons_dev *bdev; |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame] | 78 | struct input_polled_dev *poll_dev; |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 79 | struct input_dev *input; |
| 80 | struct resource *res; |
| 81 | int error, i; |
| 82 | |
| 83 | bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL); |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame] | 84 | poll_dev = input_allocate_polled_device(); |
| 85 | if (!bdev || !poll_dev) { |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 86 | error = -ENOMEM; |
| 87 | goto err_free_mem; |
| 88 | } |
| 89 | |
Dmitry Torokhov | b037b08 | 2007-11-04 00:41:36 -0400 | [diff] [blame^] | 90 | memcpy(bdev->keymap, cobalt_map, sizeof(bdev->keymap)); |
| 91 | |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame] | 92 | poll_dev->private = bdev; |
| 93 | poll_dev->poll = handle_buttons; |
| 94 | poll_dev->poll_interval = BUTTONS_POLL_INTERVAL; |
| 95 | |
| 96 | input = poll_dev->input; |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 97 | input->name = "Cobalt buttons"; |
| 98 | input->phys = "cobalt/input0"; |
| 99 | input->id.bustype = BUS_HOST; |
| 100 | input->cdev.dev = &pdev->dev; |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 101 | |
Dmitry Torokhov | b037b08 | 2007-11-04 00:41:36 -0400 | [diff] [blame^] | 102 | input->keycode = pdev->keymap; |
| 103 | input->keycodemax = ARRAY_SIZE(pdev->keymap); |
| 104 | input->keycodesize = sizeof(unsigned short); |
| 105 | |
| 106 | input_set_capability(input, EV_MSC, MSC_SCAN); |
| 107 | __set_bit(EV_KEY, input->evbit); |
| 108 | for (i = 0; i < ARRAY_SIZE(buttons_map); i++) |
| 109 | __set_bit(input->keycode[i], input->keybit); |
| 110 | __clear_bit(KEY_RESERVED, input->keybit); |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 111 | |
| 112 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 113 | if (!res) { |
| 114 | error = -EBUSY; |
| 115 | goto err_free_mem; |
| 116 | } |
| 117 | |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame] | 118 | bdev->poll_dev = poll_dev; |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 119 | bdev->reg = ioremap(res->start, res->end - res->start + 1); |
| 120 | dev_set_drvdata(&pdev->dev, bdev); |
| 121 | |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame] | 122 | error = input_register_polled_device(poll_dev); |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 123 | if (error) |
| 124 | goto err_iounmap; |
| 125 | |
| 126 | return 0; |
| 127 | |
| 128 | err_iounmap: |
| 129 | iounmap(bdev->reg); |
| 130 | err_free_mem: |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame] | 131 | input_free_polled_device(poll_dev); |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 132 | kfree(bdev); |
| 133 | dev_set_drvdata(&pdev->dev, NULL); |
| 134 | return error; |
| 135 | } |
| 136 | |
| 137 | static int __devexit cobalt_buttons_remove(struct platform_device *pdev) |
| 138 | { |
| 139 | struct device *dev = &pdev->dev; |
| 140 | struct buttons_dev *bdev = dev_get_drvdata(dev); |
| 141 | |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame] | 142 | input_unregister_polled_device(bdev->poll_dev); |
| 143 | input_free_polled_device(bdev->poll_dev); |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 144 | iounmap(bdev->reg); |
| 145 | kfree(bdev); |
| 146 | dev_set_drvdata(dev, NULL); |
| 147 | |
| 148 | return 0; |
| 149 | } |
| 150 | |
| 151 | static struct platform_driver cobalt_buttons_driver = { |
| 152 | .probe = cobalt_buttons_probe, |
| 153 | .remove = __devexit_p(cobalt_buttons_remove), |
| 154 | .driver = { |
| 155 | .name = "Cobalt buttons", |
| 156 | .owner = THIS_MODULE, |
| 157 | }, |
| 158 | }; |
| 159 | |
| 160 | static int __init cobalt_buttons_init(void) |
| 161 | { |
Dmitry Torokhov | d0a0515 | 2007-04-12 01:36:12 -0400 | [diff] [blame] | 162 | return platform_driver_register(&cobalt_buttons_driver); |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 163 | } |
| 164 | |
| 165 | static void __exit cobalt_buttons_exit(void) |
| 166 | { |
| 167 | platform_driver_unregister(&cobalt_buttons_driver); |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 168 | } |
| 169 | |
| 170 | module_init(cobalt_buttons_init); |
| 171 | module_exit(cobalt_buttons_exit); |