Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Cobalt button interface driver. |
| 3 | * |
Yoichi Yuasa | ada8e95 | 2009-07-03 00:39:38 +0900 | [diff] [blame] | 4 | * Copyright (C) 2007-2008 Yoichi Yuasa <yuasa@linux-mips.org> |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 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 |
Yoichi Yuasa | 3c51438 | 2008-03-14 11:52:37 -0400 | [diff] [blame] | 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame^] | 25 | #include <linux/slab.h> |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 26 | |
| 27 | #define BUTTONS_POLL_INTERVAL 30 /* msec */ |
| 28 | #define BUTTONS_COUNT_THRESHOLD 3 |
| 29 | #define BUTTONS_STATUS_MASK 0xfe000000 |
| 30 | |
Dmitry Torokhov | b037b08 | 2007-11-04 00:41:36 -0400 | [diff] [blame] | 31 | static const unsigned short cobalt_map[] = { |
| 32 | KEY_RESERVED, |
| 33 | KEY_RESTART, |
| 34 | KEY_LEFT, |
| 35 | KEY_UP, |
| 36 | KEY_DOWN, |
| 37 | KEY_RIGHT, |
| 38 | KEY_ENTER, |
| 39 | KEY_SELECT |
| 40 | }; |
| 41 | |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 42 | struct buttons_dev { |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame] | 43 | struct input_polled_dev *poll_dev; |
Dmitry Torokhov | b037b08 | 2007-11-04 00:41:36 -0400 | [diff] [blame] | 44 | unsigned short keymap[ARRAY_SIZE(cobalt_map)]; |
| 45 | int count[ARRAY_SIZE(cobalt_map)]; |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 46 | void __iomem *reg; |
| 47 | }; |
| 48 | |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame] | 49 | static void handle_buttons(struct input_polled_dev *dev) |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 50 | { |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame] | 51 | struct buttons_dev *bdev = dev->private; |
| 52 | struct input_dev *input = dev->input; |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 53 | uint32_t status; |
| 54 | int i; |
| 55 | |
Dmitry Torokhov | b037b08 | 2007-11-04 00:41:36 -0400 | [diff] [blame] | 56 | status = ~readl(bdev->reg) >> 24; |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 57 | |
Dmitry Torokhov | b037b08 | 2007-11-04 00:41:36 -0400 | [diff] [blame] | 58 | for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) { |
Yoichi Yuasa | 3c51438 | 2008-03-14 11:52:37 -0400 | [diff] [blame] | 59 | if (status & (1U << i)) { |
Dmitry Torokhov | b037b08 | 2007-11-04 00:41:36 -0400 | [diff] [blame] | 60 | if (++bdev->count[i] == BUTTONS_COUNT_THRESHOLD) { |
| 61 | input_event(input, EV_MSC, MSC_SCAN, i); |
| 62 | input_report_key(input, bdev->keymap[i], 1); |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame] | 63 | input_sync(input); |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 64 | } |
Dmitry Torokhov | b037b08 | 2007-11-04 00:41:36 -0400 | [diff] [blame] | 65 | } else { |
| 66 | if (bdev->count[i] >= BUTTONS_COUNT_THRESHOLD) { |
| 67 | input_event(input, EV_MSC, MSC_SCAN, i); |
| 68 | input_report_key(input, bdev->keymap[i], 0); |
| 69 | input_sync(input); |
| 70 | } |
| 71 | bdev->count[i] = 0; |
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 | } |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 74 | } |
| 75 | |
| 76 | static int __devinit cobalt_buttons_probe(struct platform_device *pdev) |
| 77 | { |
| 78 | struct buttons_dev *bdev; |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame] | 79 | struct input_polled_dev *poll_dev; |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 80 | struct input_dev *input; |
| 81 | struct resource *res; |
| 82 | int error, i; |
| 83 | |
| 84 | bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL); |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame] | 85 | poll_dev = input_allocate_polled_device(); |
| 86 | if (!bdev || !poll_dev) { |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 87 | error = -ENOMEM; |
| 88 | goto err_free_mem; |
| 89 | } |
| 90 | |
Dmitry Torokhov | b037b08 | 2007-11-04 00:41:36 -0400 | [diff] [blame] | 91 | memcpy(bdev->keymap, cobalt_map, sizeof(bdev->keymap)); |
| 92 | |
Dmitry Torokhov | 3d29cdf | 2007-04-29 23:43:06 -0400 | [diff] [blame] | 93 | poll_dev->private = bdev; |
| 94 | poll_dev->poll = handle_buttons; |
| 95 | poll_dev->poll_interval = BUTTONS_POLL_INTERVAL; |
| 96 | |
| 97 | input = poll_dev->input; |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 98 | input->name = "Cobalt buttons"; |
| 99 | input->phys = "cobalt/input0"; |
| 100 | input->id.bustype = BUS_HOST; |
Yoichi Yuasa | 3c51438 | 2008-03-14 11:52:37 -0400 | [diff] [blame] | 101 | input->dev.parent = &pdev->dev; |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 102 | |
Yoichi Yuasa | 3c51438 | 2008-03-14 11:52:37 -0400 | [diff] [blame] | 103 | input->keycode = bdev->keymap; |
| 104 | input->keycodemax = ARRAY_SIZE(bdev->keymap); |
Dmitry Torokhov | b037b08 | 2007-11-04 00:41:36 -0400 | [diff] [blame] | 105 | input->keycodesize = sizeof(unsigned short); |
| 106 | |
| 107 | input_set_capability(input, EV_MSC, MSC_SCAN); |
| 108 | __set_bit(EV_KEY, input->evbit); |
Yoichi Yuasa | 3c51438 | 2008-03-14 11:52:37 -0400 | [diff] [blame] | 109 | for (i = 0; i < ARRAY_SIZE(cobalt_map); i++) |
| 110 | __set_bit(bdev->keymap[i], input->keybit); |
Dmitry Torokhov | b037b08 | 2007-11-04 00:41:36 -0400 | [diff] [blame] | 111 | __clear_bit(KEY_RESERVED, input->keybit); |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 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; |
Julia Lawall | 72398e4 | 2009-07-07 22:04:55 -0700 | [diff] [blame] | 120 | bdev->reg = ioremap(res->start, resource_size(res)); |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 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 | |
Yoichi Yuasa | ada8e95 | 2009-07-03 00:39:38 +0900 | [diff] [blame] | 152 | MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>"); |
Martin Michlmayr | 26135ed | 2008-08-15 15:06:21 -0400 | [diff] [blame] | 153 | MODULE_DESCRIPTION("Cobalt button interface driver"); |
| 154 | MODULE_LICENSE("GPL"); |
Kay Sievers | d7b5247 | 2008-04-18 00:24:42 -0400 | [diff] [blame] | 155 | /* work with hotplug and coldplug */ |
| 156 | MODULE_ALIAS("platform:Cobalt buttons"); |
| 157 | |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 158 | static struct platform_driver cobalt_buttons_driver = { |
| 159 | .probe = cobalt_buttons_probe, |
| 160 | .remove = __devexit_p(cobalt_buttons_remove), |
| 161 | .driver = { |
| 162 | .name = "Cobalt buttons", |
| 163 | .owner = THIS_MODULE, |
| 164 | }, |
| 165 | }; |
| 166 | |
| 167 | static int __init cobalt_buttons_init(void) |
| 168 | { |
Dmitry Torokhov | d0a0515 | 2007-04-12 01:36:12 -0400 | [diff] [blame] | 169 | return platform_driver_register(&cobalt_buttons_driver); |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 170 | } |
| 171 | |
| 172 | static void __exit cobalt_buttons_exit(void) |
| 173 | { |
| 174 | platform_driver_unregister(&cobalt_buttons_driver); |
Yoichi Yuasa | bebb8a2 | 2007-02-18 01:50:18 -0500 | [diff] [blame] | 175 | } |
| 176 | |
| 177 | module_init(cobalt_buttons_init); |
| 178 | module_exit(cobalt_buttons_exit); |