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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 494 | giacomo | 1 | /* |
| 2 | * Event char devices, giving access to raw input device events. |
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| 3 | * |
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| 4 | * Copyright (c) 1999-2002 Vojtech Pavlik |
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| 5 | * |
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| 6 | * This program is free software; you can redistribute it and/or modify it |
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| 7 | * under the terms of the GNU General Public License version 2 as published by |
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| 8 | * the Free Software Foundation. |
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| 9 | */ |
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| 10 | |||
| 11 | #include <linuxcomp.h> |
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| 12 | |||
| 13 | #define EVDEV_MINOR_BASE 64 |
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| 14 | #define EVDEV_MINORS 32 |
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| 15 | #define EVDEV_BUFFER_SIZE 64 |
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| 16 | |||
| 17 | #include <linux/poll.h> |
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| 18 | #include <linux/slab.h> |
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| 19 | #include <linux/module.h> |
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| 20 | #include <linux/init.h> |
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| 21 | #include <linux/input.h> |
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| 22 | #include <linux/major.h> |
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| 23 | #include <linux/smp_lock.h> |
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| 24 | #include <linux/device.h> |
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| 25 | #include <linux/devfs_fs_kernel.h> |
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| 26 | |||
| 27 | struct evdev { |
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| 28 | int exist; |
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| 29 | int open; |
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| 30 | int minor; |
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| 31 | char name[16]; |
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| 32 | struct input_handle handle; |
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| 33 | wait_queue_head_t wait; |
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| 34 | struct evdev_list *grab; |
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| 35 | struct list_head list; |
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| 36 | }; |
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| 37 | |||
| 38 | struct evdev_list { |
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| 39 | struct input_event buffer[EVDEV_BUFFER_SIZE]; |
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| 40 | int head; |
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| 41 | int tail; |
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| 42 | struct fasync_struct *fasync; |
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| 43 | struct evdev *evdev; |
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| 44 | struct list_head node; |
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| 45 | }; |
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| 46 | |||
| 47 | static struct evdev *evdev_table[EVDEV_MINORS]; |
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| 48 | |||
| 49 | static void evdev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value) |
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| 50 | { |
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| 51 | struct evdev *evdev = handle->private; |
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| 52 | struct evdev_list *list; |
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| 53 | |||
| 54 | if (evdev->grab) { |
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| 55 | list = evdev->grab; |
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| 56 | |||
| 57 | do_gettimeofday(&list->buffer[list->head].time); |
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| 58 | list->buffer[list->head].type = type; |
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| 59 | list->buffer[list->head].code = code; |
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| 60 | list->buffer[list->head].value = value; |
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| 61 | list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1); |
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| 62 | |||
| 63 | kill_fasync(&list->fasync, SIGIO, POLL_IN); |
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| 64 | } else |
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| 65 | list_for_each_entry(list, &evdev->list, node) { |
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| 66 | |||
| 67 | do_gettimeofday(&list->buffer[list->head].time); |
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| 68 | list->buffer[list->head].type = type; |
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| 69 | list->buffer[list->head].code = code; |
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| 70 | list->buffer[list->head].value = value; |
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| 71 | list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1); |
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| 72 | |||
| 73 | kill_fasync(&list->fasync, SIGIO, POLL_IN); |
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| 74 | } |
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| 75 | |||
| 76 | wake_up_interruptible(&evdev->wait); |
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| 77 | } |
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| 78 | |||
| 79 | static int evdev_fasync(int fd, struct file *file, int on) |
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| 80 | { |
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| 81 | int retval; |
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| 82 | struct evdev_list *list = file->private_data; |
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| 83 | retval = fasync_helper(fd, file, on, &list->fasync); |
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| 84 | return retval < 0 ? retval : 0; |
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| 85 | } |
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| 86 | |||
| 87 | static int evdev_flush(struct file * file) |
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| 88 | { |
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| 89 | struct evdev_list *list = file->private_data; |
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| 90 | if (!list->evdev->exist) return -ENODEV; |
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| 91 | return input_flush_device(&list->evdev->handle, file); |
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| 92 | } |
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| 93 | |||
| 94 | static void evdev_free(struct evdev *evdev) |
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| 95 | { |
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| 96 | devfs_remove("input/event%d", evdev->minor); |
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| 97 | evdev_table[evdev->minor] = NULL; |
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| 98 | kfree(evdev); |
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| 99 | } |
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| 100 | |||
| 101 | static int evdev_release(struct inode * inode, struct file * file) |
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| 102 | { |
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| 103 | struct evdev_list *list = file->private_data; |
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| 104 | |||
| 105 | if (list->evdev->grab == list) { |
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| 106 | input_release_device(&list->evdev->handle); |
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| 107 | list->evdev->grab = NULL; |
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| 108 | } |
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| 109 | |||
| 110 | evdev_fasync(-1, file, 0); |
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| 111 | list_del(&list->node); |
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| 112 | |||
| 113 | if (!--list->evdev->open) { |
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| 114 | if (list->evdev->exist) |
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| 115 | input_close_device(&list->evdev->handle); |
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| 116 | else |
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| 117 | evdev_free(list->evdev); |
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| 118 | } |
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| 119 | |||
| 120 | kfree(list); |
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| 121 | return 0; |
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| 122 | } |
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| 123 | |||
| 124 | static int evdev_open(struct inode * inode, struct file * file) |
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| 125 | { |
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| 126 | struct evdev_list *list; |
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| 127 | int i = iminor(inode) - EVDEV_MINOR_BASE; |
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| 128 | int accept_err; |
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| 129 | |||
| 130 | if (i >= EVDEV_MINORS || !evdev_table[i]) |
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| 131 | return -ENODEV; |
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| 132 | |||
| 133 | if ((accept_err = input_accept_process(&(evdev_table[i]->handle), file))) |
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| 134 | return accept_err; |
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| 135 | |||
| 136 | if (!(list = kmalloc(sizeof(struct evdev_list), GFP_KERNEL))) |
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| 137 | return -ENOMEM; |
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| 138 | memset(list, 0, sizeof(struct evdev_list)); |
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| 139 | |||
| 140 | list->evdev = evdev_table[i]; |
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| 141 | list_add_tail(&list->node, &evdev_table[i]->list); |
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| 142 | file->private_data = list; |
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| 143 | |||
| 144 | if (!list->evdev->open++) |
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| 145 | if (list->evdev->exist) |
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| 146 | input_open_device(&list->evdev->handle); |
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| 147 | |||
| 148 | return 0; |
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| 149 | } |
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| 150 | |||
| 151 | static ssize_t evdev_write(struct file * file, const char * buffer, size_t count, loff_t *ppos) |
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| 152 | { |
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| 153 | struct evdev_list *list = file->private_data; |
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| 154 | struct input_event event; |
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| 155 | int retval = 0; |
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| 156 | |||
| 157 | if (!list->evdev->exist) return -ENODEV; |
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| 158 | |||
| 159 | while (retval < count) { |
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| 160 | |||
| 161 | if (copy_from_user(&event, buffer + retval, sizeof(struct input_event))) |
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| 162 | return -EFAULT; |
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| 163 | input_event(list->evdev->handle.dev, event.type, event.code, event.value); |
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| 164 | retval += sizeof(struct input_event); |
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| 165 | } |
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| 166 | |||
| 167 | return retval; |
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| 168 | } |
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| 169 | |||
| 170 | static ssize_t evdev_read(struct file * file, char * buffer, size_t count, loff_t *ppos) |
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| 171 | { |
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| 172 | struct evdev_list *list = file->private_data; |
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| 173 | int retval; |
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| 174 | |||
| 175 | if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK)) |
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| 176 | return -EAGAIN; |
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| 177 | |||
| 178 | retval = wait_event_interruptible(list->evdev->wait, |
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| 179 | list->head != list->tail && list->evdev->exist); |
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| 180 | |||
| 181 | if (retval) |
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| 182 | return retval; |
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| 183 | |||
| 184 | if (!list->evdev->exist) |
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| 185 | return -ENODEV; |
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| 186 | |||
| 187 | while (list->head != list->tail && retval + sizeof(struct input_event) <= count) { |
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| 188 | if (copy_to_user(buffer + retval, list->buffer + list->tail, |
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| 189 | sizeof(struct input_event))) return -EFAULT; |
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| 190 | list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1); |
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| 191 | retval += sizeof(struct input_event); |
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| 192 | } |
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| 193 | |||
| 194 | return retval; |
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| 195 | } |
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| 196 | |||
| 197 | /* No kernel lock - fine */ |
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| 198 | static unsigned int evdev_poll(struct file *file, poll_table *wait) |
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| 199 | { |
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| 200 | struct evdev_list *list = file->private_data; |
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| 201 | poll_wait(file, &list->evdev->wait, wait); |
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| 202 | if (list->head != list->tail) |
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| 203 | return POLLIN | POLLRDNORM; |
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| 204 | return 0; |
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| 205 | } |
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| 206 | |||
| 207 | static int evdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) |
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| 208 | { |
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| 209 | struct evdev_list *list = file->private_data; |
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| 210 | struct evdev *evdev = list->evdev; |
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| 211 | struct input_dev *dev = evdev->handle.dev; |
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| 212 | struct input_absinfo abs; |
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| 213 | int i, t, u, v; |
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| 214 | |||
| 215 | if (!evdev->exist) return -ENODEV; |
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| 216 | |||
| 217 | switch (cmd) { |
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| 218 | |||
| 219 | case EVIOCGVERSION: |
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| 220 | return put_user(EV_VERSION, (int *) arg); |
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| 221 | |||
| 222 | case EVIOCGID: |
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| 223 | return copy_to_user((void *) arg, &dev->id, sizeof(struct input_id)) ? -EFAULT : 0; |
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| 224 | |||
| 225 | case EVIOCGKEYCODE: |
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| 226 | if (get_user(t, ((int *) arg) + 0)) return -EFAULT; |
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| 227 | if (t < 0 || t > dev->keycodemax || !dev->keycodesize) return -EINVAL; |
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| 228 | if (put_user(INPUT_KEYCODE(dev, t), ((int *) arg) + 1)) return -EFAULT; |
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| 229 | return 0; |
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| 230 | |||
| 231 | case EVIOCSKEYCODE: |
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| 232 | if (get_user(t, ((int *) arg) + 0)) return -EFAULT; |
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| 233 | if (t < 0 || t > dev->keycodemax || !dev->keycodesize) return -EINVAL; |
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| 234 | if (get_user(v, ((int *) arg) + 1)) return -EFAULT; |
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| 235 | u = INPUT_KEYCODE(dev, t); |
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| 236 | INPUT_KEYCODE(dev, t) = v; |
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| 237 | for (i = 0; i < dev->keycodemax; i++) if (v == u) break; |
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| 238 | if (i == dev->keycodemax) clear_bit(u, dev->keybit); |
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| 239 | set_bit(v, dev->keybit); |
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| 240 | return 0; |
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| 241 | |||
| 242 | case EVIOCSFF: |
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| 243 | if (dev->upload_effect) { |
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| 244 | struct ff_effect effect; |
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| 245 | int err; |
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| 246 | |||
| 247 | if (copy_from_user((void*)(&effect), (void*)arg, sizeof(effect))) |
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| 248 | return -EFAULT; |
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| 249 | err = dev->upload_effect(dev, &effect); |
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| 250 | if (put_user(effect.id, &(((struct ff_effect*)arg)->id))) |
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| 251 | return -EFAULT; |
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| 252 | return err; |
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| 253 | } |
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| 254 | else return -ENOSYS; |
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| 255 | |||
| 256 | case EVIOCRMFF: |
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| 257 | if (dev->erase_effect) { |
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| 258 | return dev->erase_effect(dev, (int)arg); |
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| 259 | } |
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| 260 | else return -ENOSYS; |
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| 261 | |||
| 262 | case EVIOCGEFFECTS: |
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| 263 | if (put_user(dev->ff_effects_max, (int*) arg)) |
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| 264 | return -EFAULT; |
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| 265 | return 0; |
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| 266 | |||
| 267 | case EVIOCGRAB: |
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| 268 | if (arg) { |
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| 269 | if (evdev->grab) |
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| 270 | return -EBUSY; |
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| 271 | if (input_grab_device(&evdev->handle)) |
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| 272 | return -EBUSY; |
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| 273 | evdev->grab = list; |
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| 274 | return 0; |
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| 275 | } else { |
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| 276 | if (evdev->grab != list) |
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| 277 | return -EINVAL; |
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| 278 | input_release_device(&evdev->handle); |
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| 279 | evdev->grab = NULL; |
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| 280 | return 0; |
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| 281 | } |
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| 282 | |||
| 283 | default: |
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| 284 | |||
| 285 | if (_IOC_TYPE(cmd) != 'E' || _IOC_DIR(cmd) != _IOC_READ) |
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| 286 | return -EINVAL; |
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| 287 | |||
| 288 | if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) { |
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| 289 | |||
| 290 | long *bits; |
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| 291 | int len; |
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| 292 | |||
| 293 | switch (_IOC_NR(cmd) & EV_MAX) { |
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| 294 | case 0: bits = dev->evbit; len = EV_MAX; break; |
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| 295 | case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; |
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| 296 | case EV_REL: bits = dev->relbit; len = REL_MAX; break; |
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| 297 | case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; |
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| 298 | case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; |
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| 299 | case EV_LED: bits = dev->ledbit; len = LED_MAX; break; |
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| 300 | case EV_SND: bits = dev->sndbit; len = SND_MAX; break; |
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| 301 | case EV_FF: bits = dev->ffbit; len = FF_MAX; break; |
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| 302 | default: return -EINVAL; |
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| 303 | } |
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| 304 | len = NBITS(len) * sizeof(long); |
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| 305 | if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); |
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| 306 | return copy_to_user((char *) arg, bits, len) ? -EFAULT : len; |
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| 307 | } |
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| 308 | |||
| 309 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) { |
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| 310 | int len; |
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| 311 | len = NBITS(KEY_MAX) * sizeof(long); |
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| 312 | if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); |
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| 313 | return copy_to_user((char *) arg, dev->key, len) ? -EFAULT : len; |
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| 314 | } |
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| 315 | |||
| 316 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) { |
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| 317 | int len; |
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| 318 | len = NBITS(LED_MAX) * sizeof(long); |
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| 319 | if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); |
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| 320 | return copy_to_user((char *) arg, dev->led, len) ? -EFAULT : len; |
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| 321 | } |
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| 322 | |||
| 323 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) { |
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| 324 | int len; |
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| 325 | len = NBITS(SND_MAX) * sizeof(long); |
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| 326 | if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); |
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| 327 | return copy_to_user((char *) arg, dev->snd, len) ? -EFAULT : len; |
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| 328 | } |
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| 329 | |||
| 330 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) { |
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| 331 | int len; |
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| 332 | if (!dev->name) return -ENOENT; |
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| 333 | len = strlen(dev->name) + 1; |
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| 334 | if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); |
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| 335 | return copy_to_user((char *) arg, dev->name, len) ? -EFAULT : len; |
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| 336 | } |
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| 337 | |||
| 338 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) { |
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| 339 | int len; |
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| 340 | if (!dev->phys) return -ENOENT; |
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| 341 | len = strlen(dev->phys) + 1; |
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| 342 | if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); |
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| 343 | return copy_to_user((char *) arg, dev->phys, len) ? -EFAULT : len; |
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| 344 | } |
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| 345 | |||
| 346 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) { |
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| 347 | int len; |
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| 348 | if (!dev->uniq) return -ENOENT; |
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| 349 | len = strlen(dev->uniq) + 1; |
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| 350 | if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); |
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| 351 | return copy_to_user((char *) arg, dev->uniq, len) ? -EFAULT : len; |
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| 352 | } |
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| 353 | |||
| 354 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { |
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| 355 | |||
| 356 | int t = _IOC_NR(cmd) & ABS_MAX; |
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| 357 | |||
| 358 | abs.value = dev->abs[t]; |
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| 359 | abs.minimum = dev->absmin[t]; |
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| 360 | abs.maximum = dev->absmax[t]; |
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| 361 | abs.fuzz = dev->absfuzz[t]; |
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| 362 | abs.flat = dev->absflat[t]; |
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| 363 | |||
| 364 | if (copy_to_user((void *) arg, &abs, sizeof(struct input_absinfo))) |
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| 365 | return -EFAULT; |
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| 366 | |||
| 367 | return 0; |
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| 368 | } |
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| 369 | |||
| 370 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { |
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| 371 | |||
| 372 | int t = _IOC_NR(cmd) & ABS_MAX; |
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| 373 | |||
| 374 | if (copy_from_user(&abs, (void *) arg, sizeof(struct input_absinfo))) |
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| 375 | return -EFAULT; |
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| 376 | |||
| 377 | dev->abs[t] = abs.value; |
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| 378 | dev->absmin[t] = abs.minimum; |
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| 379 | dev->absmax[t] = abs.maximum; |
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| 380 | dev->absfuzz[t] = abs.fuzz; |
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| 381 | dev->absflat[t] = abs.flat; |
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| 382 | |||
| 383 | return 0; |
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| 384 | } |
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| 385 | } |
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| 386 | return -EINVAL; |
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| 387 | } |
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| 388 | |||
| 389 | static struct file_operations evdev_fops = { |
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| 390 | .owner = THIS_MODULE, |
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| 391 | .read = evdev_read, |
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| 392 | .write = evdev_write, |
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| 393 | .poll = evdev_poll, |
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| 394 | .open = evdev_open, |
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| 395 | .release = evdev_release, |
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| 396 | .ioctl = evdev_ioctl, |
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| 397 | .fasync = evdev_fasync, |
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| 398 | .flush = evdev_flush |
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| 399 | }; |
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| 400 | |||
| 401 | static struct input_handle *evdev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id) |
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| 402 | { |
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| 403 | struct evdev *evdev; |
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| 404 | int minor; |
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| 405 | |||
| 406 | for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++); |
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| 407 | if (minor == EVDEV_MINORS) { |
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| 408 | printk(KERN_ERR "evdev: no more free evdev devices\n"); |
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| 409 | return NULL; |
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| 410 | } |
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| 411 | |||
| 412 | if (!(evdev = kmalloc(sizeof(struct evdev), GFP_KERNEL))) |
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| 413 | return NULL; |
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| 414 | memset(evdev, 0, sizeof(struct evdev)); |
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| 415 | |||
| 416 | INIT_LIST_HEAD(&evdev->list); |
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| 417 | init_waitqueue_head(&evdev->wait); |
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| 418 | |||
| 419 | evdev->exist = 1; |
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| 420 | evdev->minor = minor; |
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| 421 | evdev->handle.dev = dev; |
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| 422 | evdev->handle.name = evdev->name; |
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| 423 | evdev->handle.handler = handler; |
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| 424 | evdev->handle.private = evdev; |
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| 425 | sprintf26(evdev->name, "event%d", minor); |
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| 426 | |||
| 427 | evdev_table[minor] = evdev; |
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| 428 | |||
| 429 | devfs_mk_cdev(MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor), |
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| 430 | S_IFCHR|S_IRUGO|S_IWUSR, "input/event%d", minor); |
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| 431 | |||
| 432 | return &evdev->handle; |
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| 433 | } |
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| 434 | |||
| 435 | static void evdev_disconnect(struct input_handle *handle) |
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| 436 | { |
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| 437 | struct evdev *evdev = handle->private; |
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| 438 | |||
| 439 | evdev->exist = 0; |
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| 440 | |||
| 441 | if (evdev->open) { |
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| 442 | input_close_device(handle); |
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| 443 | wake_up_interruptible(&evdev->wait); |
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| 444 | } else |
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| 445 | evdev_free(evdev); |
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| 446 | } |
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| 447 | |||
| 448 | static struct input_device_id evdev_ids[] = { |
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| 449 | { .driver_info = 1 }, /* Matches all devices */ |
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| 450 | { }, /* Terminating zero entry */ |
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| 451 | }; |
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| 452 | |||
| 453 | MODULE_DEVICE_TABLE(input, evdev_ids); |
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| 454 | |||
| 455 | static struct input_handler evdev_handler = { |
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| 456 | .event = evdev_event, |
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| 457 | .connect = evdev_connect, |
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| 458 | .disconnect = evdev_disconnect, |
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| 459 | .fops = &evdev_fops, |
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| 460 | .minor = EVDEV_MINOR_BASE, |
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| 461 | .name = "evdev", |
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| 462 | .id_table = evdev_ids, |
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| 463 | }; |
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| 464 | |||
| 465 | /*static*/ int __init evdev_init(void) |
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| 466 | { |
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| 467 | input_register_handler(&evdev_handler); |
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| 468 | return 0; |
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| 469 | } |
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| 470 | |||
| 471 | /*static*/ void __exit evdev_exit(void) |
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| 472 | { |
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| 473 | input_unregister_handler(&evdev_handler); |
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| 474 | } |
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| 475 | |||
| 476 | module_init(evdev_init); |
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| 477 | module_exit(evdev_exit); |
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| 478 | |||
| 479 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); |
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| 480 | MODULE_DESCRIPTION("Input driver event char devices"); |
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| 481 | MODULE_LICENSE("GPL"); |