1 /* 2 * Cobalt button interface driver. 3 * 4 * Copyright (C) 2007-2008 Yoichi Yuasa <yuasa@linux-mips.org> 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/input-polldev.h> 21 #include <linux/ioport.h> 22 #include <linux/module.h> 23 #include <linux/platform_device.h> 24 #include <linux/slab.h> 25 26 #define BUTTONS_POLL_INTERVAL 30 /* msec */ 27 #define BUTTONS_COUNT_THRESHOLD 3 28 #define BUTTONS_STATUS_MASK 0xfe000000 29 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 41 struct buttons_dev { 42 struct input_polled_dev *poll_dev; 43 unsigned short keymap[ARRAY_SIZE(cobalt_map)]; 44 int count[ARRAY_SIZE(cobalt_map)]; 45 void __iomem *reg; 46 }; 47 48 static void handle_buttons(struct input_polled_dev *dev) 49 { 50 struct buttons_dev *bdev = dev->private; 51 struct input_dev *input = dev->input; 52 uint32_t status; 53 int i; 54 55 status = ~readl(bdev->reg) >> 24; 56 57 for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) { 58 if (status & (1U << 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); 62 input_sync(input); 63 } 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; 71 } 72 } 73 } 74 75 static int cobalt_buttons_probe(struct platform_device *pdev) 76 { 77 struct buttons_dev *bdev; 78 struct input_polled_dev *poll_dev; 79 struct input_dev *input; 80 struct resource *res; 81 int error, i; 82 83 bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL); 84 poll_dev = input_allocate_polled_device(); 85 if (!bdev || !poll_dev) { 86 error = -ENOMEM; 87 goto err_free_mem; 88 } 89 90 memcpy(bdev->keymap, cobalt_map, sizeof(bdev->keymap)); 91 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; 97 input->name = "Cobalt buttons"; 98 input->phys = "cobalt/input0"; 99 input->id.bustype = BUS_HOST; 100 input->dev.parent = &pdev->dev; 101 102 input->keycode = bdev->keymap; 103 input->keycodemax = ARRAY_SIZE(bdev->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(cobalt_map); i++) 109 __set_bit(bdev->keymap[i], input->keybit); 110 __clear_bit(KEY_RESERVED, input->keybit); 111 112 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 113 if (!res) { 114 error = -EBUSY; 115 goto err_free_mem; 116 } 117 118 bdev->poll_dev = poll_dev; 119 bdev->reg = ioremap(res->start, resource_size(res)); 120 dev_set_drvdata(&pdev->dev, bdev); 121 122 error = input_register_polled_device(poll_dev); 123 if (error) 124 goto err_iounmap; 125 126 return 0; 127 128 err_iounmap: 129 iounmap(bdev->reg); 130 err_free_mem: 131 input_free_polled_device(poll_dev); 132 kfree(bdev); 133 return error; 134 } 135 136 static int cobalt_buttons_remove(struct platform_device *pdev) 137 { 138 struct device *dev = &pdev->dev; 139 struct buttons_dev *bdev = dev_get_drvdata(dev); 140 141 input_unregister_polled_device(bdev->poll_dev); 142 input_free_polled_device(bdev->poll_dev); 143 iounmap(bdev->reg); 144 kfree(bdev); 145 146 return 0; 147 } 148 149 MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>"); 150 MODULE_DESCRIPTION("Cobalt button interface driver"); 151 MODULE_LICENSE("GPL"); 152 /* work with hotplug and coldplug */ 153 MODULE_ALIAS("platform:Cobalt buttons"); 154 155 static struct platform_driver cobalt_buttons_driver = { 156 .probe = cobalt_buttons_probe, 157 .remove = cobalt_buttons_remove, 158 .driver = { 159 .name = "Cobalt buttons", 160 }, 161 }; 162 module_platform_driver(cobalt_buttons_driver); 163