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/init.h> 21 #include <linux/input-polldev.h> 22 #include <linux/ioport.h> 23 #include <linux/module.h> 24 #include <linux/platform_device.h> 25 #include <linux/slab.h> 26 27 #define BUTTONS_POLL_INTERVAL 30 /* msec */ 28 #define BUTTONS_COUNT_THRESHOLD 3 29 #define BUTTONS_STATUS_MASK 0xfe000000 30 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 42 struct buttons_dev { 43 struct input_polled_dev *poll_dev; 44 unsigned short keymap[ARRAY_SIZE(cobalt_map)]; 45 int count[ARRAY_SIZE(cobalt_map)]; 46 void __iomem *reg; 47 }; 48 49 static void handle_buttons(struct input_polled_dev *dev) 50 { 51 struct buttons_dev *bdev = dev->private; 52 struct input_dev *input = dev->input; 53 uint32_t status; 54 int i; 55 56 status = ~readl(bdev->reg) >> 24; 57 58 for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) { 59 if (status & (1U << i)) { 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); 63 input_sync(input); 64 } 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; 72 } 73 } 74 } 75 76 static int cobalt_buttons_probe(struct platform_device *pdev) 77 { 78 struct buttons_dev *bdev; 79 struct input_polled_dev *poll_dev; 80 struct input_dev *input; 81 struct resource *res; 82 int error, i; 83 84 bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL); 85 poll_dev = input_allocate_polled_device(); 86 if (!bdev || !poll_dev) { 87 error = -ENOMEM; 88 goto err_free_mem; 89 } 90 91 memcpy(bdev->keymap, cobalt_map, sizeof(bdev->keymap)); 92 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; 98 input->name = "Cobalt buttons"; 99 input->phys = "cobalt/input0"; 100 input->id.bustype = BUS_HOST; 101 input->dev.parent = &pdev->dev; 102 103 input->keycode = bdev->keymap; 104 input->keycodemax = ARRAY_SIZE(bdev->keymap); 105 input->keycodesize = sizeof(unsigned short); 106 107 input_set_capability(input, EV_MSC, MSC_SCAN); 108 __set_bit(EV_KEY, input->evbit); 109 for (i = 0; i < ARRAY_SIZE(cobalt_map); i++) 110 __set_bit(bdev->keymap[i], input->keybit); 111 __clear_bit(KEY_RESERVED, input->keybit); 112 113 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 114 if (!res) { 115 error = -EBUSY; 116 goto err_free_mem; 117 } 118 119 bdev->poll_dev = poll_dev; 120 bdev->reg = ioremap(res->start, resource_size(res)); 121 dev_set_drvdata(&pdev->dev, bdev); 122 123 error = input_register_polled_device(poll_dev); 124 if (error) 125 goto err_iounmap; 126 127 return 0; 128 129 err_iounmap: 130 iounmap(bdev->reg); 131 err_free_mem: 132 input_free_polled_device(poll_dev); 133 kfree(bdev); 134 dev_set_drvdata(&pdev->dev, NULL); 135 return error; 136 } 137 138 static int cobalt_buttons_remove(struct platform_device *pdev) 139 { 140 struct device *dev = &pdev->dev; 141 struct buttons_dev *bdev = dev_get_drvdata(dev); 142 143 input_unregister_polled_device(bdev->poll_dev); 144 input_free_polled_device(bdev->poll_dev); 145 iounmap(bdev->reg); 146 kfree(bdev); 147 dev_set_drvdata(dev, NULL); 148 149 return 0; 150 } 151 152 MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>"); 153 MODULE_DESCRIPTION("Cobalt button interface driver"); 154 MODULE_LICENSE("GPL"); 155 /* work with hotplug and coldplug */ 156 MODULE_ALIAS("platform:Cobalt buttons"); 157 158 static struct platform_driver cobalt_buttons_driver = { 159 .probe = cobalt_buttons_probe, 160 .remove = cobalt_buttons_remove, 161 .driver = { 162 .name = "Cobalt buttons", 163 .owner = THIS_MODULE, 164 }, 165 }; 166 module_platform_driver(cobalt_buttons_driver); 167