1 /* 2 * SGI Volume Button interface driver 3 * 4 * Copyright (C) 2008 Thomas Bogendoerfer <tsbogend@alpha.franken.de> 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 #ifdef CONFIG_SGI_IP22 27 #include <asm/sgi/ioc.h> 28 29 static inline u8 button_status(void) 30 { 31 u8 status; 32 33 status = readb(&sgioc->panel) ^ 0xa0; 34 return ((status & 0x80) >> 6) | ((status & 0x20) >> 5); 35 } 36 #endif 37 38 #ifdef CONFIG_SGI_IP32 39 #include <asm/ip32/mace.h> 40 41 static inline u8 button_status(void) 42 { 43 u64 status; 44 45 status = readq(&mace->perif.audio.control); 46 writeq(status & ~(3U << 23), &mace->perif.audio.control); 47 48 return (status >> 23) & 3; 49 } 50 #endif 51 52 #define BUTTONS_POLL_INTERVAL 30 /* msec */ 53 #define BUTTONS_COUNT_THRESHOLD 3 54 55 static const unsigned short sgi_map[] = { 56 KEY_VOLUMEDOWN, 57 KEY_VOLUMEUP 58 }; 59 60 struct buttons_dev { 61 struct input_polled_dev *poll_dev; 62 unsigned short keymap[ARRAY_SIZE(sgi_map)]; 63 int count[ARRAY_SIZE(sgi_map)]; 64 }; 65 66 static void handle_buttons(struct input_polled_dev *dev) 67 { 68 struct buttons_dev *bdev = dev->private; 69 struct input_dev *input = dev->input; 70 u8 status; 71 int i; 72 73 status = button_status(); 74 75 for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) { 76 if (status & (1U << i)) { 77 if (++bdev->count[i] == BUTTONS_COUNT_THRESHOLD) { 78 input_event(input, EV_MSC, MSC_SCAN, i); 79 input_report_key(input, bdev->keymap[i], 1); 80 input_sync(input); 81 } 82 } else { 83 if (bdev->count[i] >= BUTTONS_COUNT_THRESHOLD) { 84 input_event(input, EV_MSC, MSC_SCAN, i); 85 input_report_key(input, bdev->keymap[i], 0); 86 input_sync(input); 87 } 88 bdev->count[i] = 0; 89 } 90 } 91 } 92 93 static int sgi_buttons_probe(struct platform_device *pdev) 94 { 95 struct buttons_dev *bdev; 96 struct input_polled_dev *poll_dev; 97 struct input_dev *input; 98 int error, i; 99 100 bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL); 101 poll_dev = input_allocate_polled_device(); 102 if (!bdev || !poll_dev) { 103 error = -ENOMEM; 104 goto err_free_mem; 105 } 106 107 memcpy(bdev->keymap, sgi_map, sizeof(bdev->keymap)); 108 109 poll_dev->private = bdev; 110 poll_dev->poll = handle_buttons; 111 poll_dev->poll_interval = BUTTONS_POLL_INTERVAL; 112 113 input = poll_dev->input; 114 input->name = "SGI buttons"; 115 input->phys = "sgi/input0"; 116 input->id.bustype = BUS_HOST; 117 input->dev.parent = &pdev->dev; 118 119 input->keycode = bdev->keymap; 120 input->keycodemax = ARRAY_SIZE(bdev->keymap); 121 input->keycodesize = sizeof(unsigned short); 122 123 input_set_capability(input, EV_MSC, MSC_SCAN); 124 __set_bit(EV_KEY, input->evbit); 125 for (i = 0; i < ARRAY_SIZE(sgi_map); i++) 126 __set_bit(bdev->keymap[i], input->keybit); 127 __clear_bit(KEY_RESERVED, input->keybit); 128 129 bdev->poll_dev = poll_dev; 130 platform_set_drvdata(pdev, bdev); 131 132 error = input_register_polled_device(poll_dev); 133 if (error) 134 goto err_free_mem; 135 136 return 0; 137 138 err_free_mem: 139 input_free_polled_device(poll_dev); 140 kfree(bdev); 141 return error; 142 } 143 144 static int sgi_buttons_remove(struct platform_device *pdev) 145 { 146 struct buttons_dev *bdev = platform_get_drvdata(pdev); 147 148 input_unregister_polled_device(bdev->poll_dev); 149 input_free_polled_device(bdev->poll_dev); 150 kfree(bdev); 151 152 return 0; 153 } 154 155 static struct platform_driver sgi_buttons_driver = { 156 .probe = sgi_buttons_probe, 157 .remove = sgi_buttons_remove, 158 .driver = { 159 .name = "sgibtns", 160 }, 161 }; 162 module_platform_driver(sgi_buttons_driver); 163 164 MODULE_LICENSE("GPL"); 165