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> 21 #include <linux/input.h> 22 #include <linux/ioport.h> 23 #include <linux/module.h> 24 #include <linux/platform_device.h> 25 #include <linux/jiffies.h> 26 #include <linux/timer.h> 27 28 #define BUTTONS_POLL_INTERVAL 30 /* msec */ 29 #define BUTTONS_COUNT_THRESHOLD 3 30 #define BUTTONS_STATUS_MASK 0xfe000000 31 32 struct buttons_dev { 33 struct input_dev *input; 34 void __iomem *reg; 35 }; 36 37 struct buttons_map { 38 uint32_t mask; 39 int keycode; 40 int count; 41 }; 42 43 static struct buttons_map buttons_map[] = { 44 { 0x02000000, KEY_RESTART, }, 45 { 0x04000000, KEY_LEFT, }, 46 { 0x08000000, KEY_UP, }, 47 { 0x10000000, KEY_DOWN, }, 48 { 0x20000000, KEY_RIGHT, }, 49 { 0x40000000, KEY_ENTER, }, 50 { 0x80000000, KEY_SELECT, }, 51 }; 52 53 static struct resource cobalt_buttons_resource __initdata = { 54 .start = 0x1d000000, 55 .end = 0x1d000003, 56 .flags = IORESOURCE_MEM, 57 }; 58 59 static struct platform_device *cobalt_buttons_device; 60 61 static struct timer_list buttons_timer; 62 63 static void handle_buttons(unsigned long data) 64 { 65 struct buttons_map *button = buttons_map; 66 struct buttons_dev *bdev; 67 uint32_t status; 68 int i; 69 70 bdev = (struct buttons_dev *)data; 71 status = readl(bdev->reg); 72 status = ~status & BUTTONS_STATUS_MASK; 73 74 for (i = 0; i < ARRAY_SIZE(buttons_map); i++) { 75 if (status & button->mask) { 76 button->count++; 77 } else { 78 if (button->count >= BUTTONS_COUNT_THRESHOLD) { 79 input_report_key(bdev->input, button->keycode, 0); 80 input_sync(bdev->input); 81 } 82 button->count = 0; 83 } 84 85 if (button->count == BUTTONS_COUNT_THRESHOLD) { 86 input_report_key(bdev->input, button->keycode, 1); 87 input_sync(bdev->input); 88 } 89 90 button++; 91 } 92 93 mod_timer(&buttons_timer, jiffies + msecs_to_jiffies(BUTTONS_POLL_INTERVAL)); 94 } 95 96 static int cobalt_buttons_open(struct input_dev *dev) 97 { 98 mod_timer(&buttons_timer, jiffies + msecs_to_jiffies(BUTTONS_POLL_INTERVAL)); 99 100 return 0; 101 } 102 103 static void cobalt_buttons_close(struct input_dev *dev) 104 { 105 del_timer_sync(&buttons_timer); 106 } 107 108 static int __devinit cobalt_buttons_probe(struct platform_device *pdev) 109 { 110 struct buttons_dev *bdev; 111 struct input_dev *input; 112 struct resource *res; 113 int error, i; 114 115 bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL); 116 input = input_allocate_device(); 117 if (!bdev || !input) { 118 error = -ENOMEM; 119 goto err_free_mem; 120 } 121 122 input->name = "Cobalt buttons"; 123 input->phys = "cobalt/input0"; 124 input->id.bustype = BUS_HOST; 125 input->cdev.dev = &pdev->dev; 126 input->open = cobalt_buttons_open; 127 input->close = cobalt_buttons_close; 128 129 input->evbit[0] = BIT(EV_KEY); 130 for (i = 0; i < ARRAY_SIZE(buttons_map); i++) { 131 set_bit(buttons_map[i].keycode, input->keybit); 132 buttons_map[i].count = 0; 133 } 134 135 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 136 if (!res) { 137 error = -EBUSY; 138 goto err_free_mem; 139 } 140 141 bdev->input = input; 142 bdev->reg = ioremap(res->start, res->end - res->start + 1); 143 dev_set_drvdata(&pdev->dev, bdev); 144 145 setup_timer(&buttons_timer, handle_buttons, (unsigned long)bdev); 146 147 error = input_register_device(input); 148 if (error) 149 goto err_iounmap; 150 151 return 0; 152 153 err_iounmap: 154 iounmap(bdev->reg); 155 err_free_mem: 156 input_free_device(input); 157 kfree(bdev); 158 dev_set_drvdata(&pdev->dev, NULL); 159 return error; 160 } 161 162 static int __devexit cobalt_buttons_remove(struct platform_device *pdev) 163 { 164 struct device *dev = &pdev->dev; 165 struct buttons_dev *bdev = dev_get_drvdata(dev); 166 167 input_unregister_device(bdev->input); 168 iounmap(bdev->reg); 169 kfree(bdev); 170 dev_set_drvdata(dev, NULL); 171 172 return 0; 173 } 174 175 static struct platform_driver cobalt_buttons_driver = { 176 .probe = cobalt_buttons_probe, 177 .remove = __devexit_p(cobalt_buttons_remove), 178 .driver = { 179 .name = "Cobalt buttons", 180 .owner = THIS_MODULE, 181 }, 182 }; 183 184 static int __init cobalt_buttons_init(void) 185 { 186 int retval; 187 188 cobalt_buttons_device = platform_device_register_simple("Cobalt buttons", -1, 189 &cobalt_buttons_resource, 1); 190 if (IS_ERR(cobalt_buttons_device)) { 191 retval = PTR_ERR(cobalt_buttons_device); 192 return retval; 193 } 194 195 retval = platform_driver_register(&cobalt_buttons_driver); 196 if (retval < 0) 197 platform_device_unregister(cobalt_buttons_device); 198 199 return retval; 200 } 201 202 static void __exit cobalt_buttons_exit(void) 203 { 204 platform_driver_unregister(&cobalt_buttons_driver); 205 platform_device_unregister(cobalt_buttons_device); 206 } 207 208 module_init(cobalt_buttons_init); 209 module_exit(cobalt_buttons_exit); 210