/* * The input core * * Copyright (c) 1999-2002 Vojtech Pavlik */ /* * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published by * the Free Software Foundation. */ #include #include #include #include #include #include #include #include #include #include #include #include MODULE_AUTHOR("Vojtech Pavlik "); MODULE_DESCRIPTION("Input core"); MODULE_LICENSE("GPL"); EXPORT_SYMBOL(input_allocate_device); EXPORT_SYMBOL(input_register_device); EXPORT_SYMBOL(input_unregister_device); EXPORT_SYMBOL(input_register_handler); EXPORT_SYMBOL(input_unregister_handler); EXPORT_SYMBOL(input_grab_device); EXPORT_SYMBOL(input_release_device); EXPORT_SYMBOL(input_open_device); EXPORT_SYMBOL(input_close_device); EXPORT_SYMBOL(input_accept_process); EXPORT_SYMBOL(input_flush_device); EXPORT_SYMBOL(input_event); EXPORT_SYMBOL(input_class); #define INPUT_DEVICES 256 static LIST_HEAD(input_dev_list); static LIST_HEAD(input_handler_list); static struct input_handler *input_table[8]; void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) { struct input_handle *handle; if (type > EV_MAX || !test_bit(type, dev->evbit)) return; add_input_randomness(type, code, value); switch (type) { case EV_SYN: switch (code) { case SYN_CONFIG: if (dev->event) dev->event(dev, type, code, value); break; case SYN_REPORT: if (dev->sync) return; dev->sync = 1; break; } break; case EV_KEY: if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value) return; if (value == 2) break; change_bit(code, dev->key); if (test_bit(EV_REP, dev->evbit) && dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && dev->timer.data && value) { dev->repeat_key = code; mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_DELAY])); } break; case EV_SW: if (code > SW_MAX || !test_bit(code, dev->swbit) || !!test_bit(code, dev->sw) == value) return; change_bit(code, dev->sw); break; case EV_ABS: if (code > ABS_MAX || !test_bit(code, dev->absbit)) return; if (dev->absfuzz[code]) { if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) && (value < dev->abs[code] + (dev->absfuzz[code] >> 1))) return; if ((value > dev->abs[code] - dev->absfuzz[code]) && (value < dev->abs[code] + dev->absfuzz[code])) value = (dev->abs[code] * 3 + value) >> 2; if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) && (value < dev->abs[code] + (dev->absfuzz[code] << 1))) value = (dev->abs[code] + value) >> 1; } if (dev->abs[code] == value) return; dev->abs[code] = value; break; case EV_REL: if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0)) return; break; case EV_MSC: if (code > MSC_MAX || !test_bit(code, dev->mscbit)) return; if (dev->event) dev->event(dev, type, code, value); break; case EV_LED: if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value) return; change_bit(code, dev->led); if (dev->event) dev->event(dev, type, code, value); break; case EV_SND: if (code > SND_MAX || !test_bit(code, dev->sndbit)) return; if (dev->event) dev->event(dev, type, code, value); break; case EV_REP: if (code > REP_MAX || value < 0 || dev->rep[code] == value) return; dev->rep[code] = value; if (dev->event) dev->event(dev, type, code, value); break; case EV_FF: if (dev->event) dev->event(dev, type, code, value); break; } if (type != EV_SYN) dev->sync = 0; if (dev->grab) dev->grab->handler->event(dev->grab, type, code, value); else list_for_each_entry(handle, &dev->h_list, d_node) if (handle->open) handle->handler->event(handle, type, code, value); } static void input_repeat_key(unsigned long data) { struct input_dev *dev = (void *) data; if (!test_bit(dev->repeat_key, dev->key)) return; input_event(dev, EV_KEY, dev->repeat_key, 2); input_sync(dev); if (dev->rep[REP_PERIOD]) mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD])); } int input_accept_process(struct input_handle *handle, struct file *file) { if (handle->dev->accept) return handle->dev->accept(handle->dev, file); return 0; } int input_grab_device(struct input_handle *handle) { if (handle->dev->grab) return -EBUSY; handle->dev->grab = handle; return 0; } void input_release_device(struct input_handle *handle) { if (handle->dev->grab == handle) handle->dev->grab = NULL; } int input_open_device(struct input_handle *handle) { struct input_dev *dev = handle->dev; int err; err = down_interruptible(&dev->sem); if (err) return err; handle->open++; if (!dev->users++ && dev->open) err = dev->open(dev); if (err) handle->open--; up(&dev->sem); return err; } int input_flush_device(struct input_handle* handle, struct file* file) { if (handle->dev->flush) return handle->dev->flush(handle->dev, file); return 0; } void input_close_device(struct input_handle *handle) { struct input_dev *dev = handle->dev; input_release_device(handle); down(&dev->sem); if (!--dev->users && dev->close) dev->close(dev); handle->open--; up(&dev->sem); } static void input_link_handle(struct input_handle *handle) { list_add_tail(&handle->d_node, &handle->dev->h_list); list_add_tail(&handle->h_node, &handle->handler->h_list); } #define MATCH_BIT(bit, max) \ for (i = 0; i < NBITS(max); i++) \ if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \ break; \ if (i != NBITS(max)) \ continue; static struct input_device_id *input_match_device(struct input_device_id *id, struct input_dev *dev) { int i; for (; id->flags || id->driver_info; id++) { if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) if (id->id.bustype != dev->id.bustype) continue; if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) if (id->id.vendor != dev->id.vendor) continue; if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) if (id->id.product != dev->id.product) continue; if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) if (id->id.version != dev->id.version) continue; MATCH_BIT(evbit, EV_MAX); MATCH_BIT(keybit, KEY_MAX); MATCH_BIT(relbit, REL_MAX); MATCH_BIT(absbit, ABS_MAX); MATCH_BIT(mscbit, MSC_MAX); MATCH_BIT(ledbit, LED_MAX); MATCH_BIT(sndbit, SND_MAX); MATCH_BIT(ffbit, FF_MAX); MATCH_BIT(swbit, SW_MAX); return id; } return NULL; } /* * Input hotplugging interface - loading event handlers based on * device bitfields. */ #ifdef CONFIG_HOTPLUG /* * Input hotplugging invokes what /proc/sys/kernel/hotplug says * (normally /sbin/hotplug) when input devices get added or removed. * * This invokes a user mode policy agent, typically helping to load driver * or other modules, configure the device, and more. Drivers can provide * a MODULE_DEVICE_TABLE to help with module loading subtasks. * */ #define SPRINTF_BIT_A(bit, name, max) \ do { \ envp[i++] = scratch; \ scratch += sprintf(scratch, name); \ for (j = NBITS(max) - 1; j >= 0; j--) \ if (dev->bit[j]) break; \ for (; j >= 0; j--) \ scratch += sprintf(scratch, "%lx ", dev->bit[j]); \ scratch++; \ } while (0) #define SPRINTF_BIT_A2(bit, name, max, ev) \ do { \ if (test_bit(ev, dev->evbit)) \ SPRINTF_BIT_A(bit, name, max); \ } while (0) static void input_call_hotplug(char *verb, struct input_dev *dev) { char *argv[3], **envp, *buf, *scratch; int i = 0, j, value; if (!hotplug_path[0]) { printk(KERN_ERR "input.c: calling hotplug without a hotplug agent defined\n"); return; } if (in_interrupt()) { printk(KERN_ERR "input.c: calling hotplug from interrupt\n"); return; } if (!current->fs->root) { printk(KERN_WARNING "input.c: calling hotplug without valid filesystem\n"); return; } if (!(envp = (char **) kmalloc(20 * sizeof(char *), GFP_KERNEL))) { printk(KERN_ERR "input.c: not enough memory allocating hotplug environment\n"); return; } if (!(buf = kmalloc(1024, GFP_KERNEL))) { kfree (envp); printk(KERN_ERR "input.c: not enough memory allocating hotplug environment\n"); return; } argv[0] = hotplug_path; argv[1] = "input"; argv[2] = NULL; envp[i++] = "HOME=/"; envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; scratch = buf; envp[i++] = scratch; scratch += sprintf(scratch, "ACTION=%s", verb) + 1; envp[i++] = scratch; scratch += sprintf(scratch, "PRODUCT=%x/%x/%x/%x", dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version) + 1; if (dev->name) { envp[i++] = scratch; scratch += sprintf(scratch, "NAME=%s", dev->name) + 1; } if (dev->phys) { envp[i++] = scratch; scratch += sprintf(scratch, "PHYS=%s", dev->phys) + 1; } SPRINTF_BIT_A(evbit, "EV=", EV_MAX); SPRINTF_BIT_A2(keybit, "KEY=", KEY_MAX, EV_KEY); SPRINTF_BIT_A2(relbit, "REL=", REL_MAX, EV_REL); SPRINTF_BIT_A2(absbit, "ABS=", ABS_MAX, EV_ABS); SPRINTF_BIT_A2(mscbit, "MSC=", MSC_MAX, EV_MSC); SPRINTF_BIT_A2(ledbit, "LED=", LED_MAX, EV_LED); SPRINTF_BIT_A2(sndbit, "SND=", SND_MAX, EV_SND); SPRINTF_BIT_A2(ffbit, "FF=", FF_MAX, EV_FF); SPRINTF_BIT_A2(swbit, "SW=", SW_MAX, EV_SW); envp[i++] = NULL; #ifdef INPUT_DEBUG printk(KERN_DEBUG "input.c: calling %s %s [%s %s %s %s %s]\n", argv[0], argv[1], envp[0], envp[1], envp[2], envp[3], envp[4]); #endif value = call_usermodehelper(argv [0], argv, envp, 0); kfree(buf); kfree(envp); #ifdef INPUT_DEBUG if (value != 0) printk(KERN_DEBUG "input.c: hotplug returned %d\n", value); #endif } #endif #ifdef CONFIG_PROC_FS static struct proc_dir_entry *proc_bus_input_dir; static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait); static int input_devices_state; static inline void input_wakeup_procfs_readers(void) { input_devices_state++; wake_up(&input_devices_poll_wait); } static unsigned int input_devices_poll(struct file *file, poll_table *wait) { int state = input_devices_state; poll_wait(file, &input_devices_poll_wait, wait); if (state != input_devices_state) return POLLIN | POLLRDNORM; return 0; } #define SPRINTF_BIT_B(bit, name, max) \ do { \ len += sprintf(buf + len, "B: %s", name); \ for (i = NBITS(max) - 1; i >= 0; i--) \ if (dev->bit[i]) break; \ for (; i >= 0; i--) \ len += sprintf(buf + len, "%lx ", dev->bit[i]); \ len += sprintf(buf + len, "\n"); \ } while (0) #define SPRINTF_BIT_B2(bit, name, max, ev) \ do { \ if (test_bit(ev, dev->evbit)) \ SPRINTF_BIT_B(bit, name, max); \ } while (0) static int input_devices_read(char *buf, char **start, off_t pos, int count, int *eof, void *data) { struct input_dev *dev; struct input_handle *handle; off_t at = 0; int i, len, cnt = 0; list_for_each_entry(dev, &input_dev_list, node) { len = sprintf(buf, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); len += sprintf(buf + len, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); len += sprintf(buf + len, "P: Phys=%s\n", dev->phys ? dev->phys : ""); len += sprintf(buf + len, "H: Handlers="); list_for_each_entry(handle, &dev->h_list, d_node) len += sprintf(buf + len, "%s ", handle->name); len += sprintf(buf + len, "\n"); SPRINTF_BIT_B(evbit, "EV=", EV_MAX); SPRINTF_BIT_B2(keybit, "KEY=", KEY_MAX, EV_KEY); SPRINTF_BIT_B2(relbit, "REL=", REL_MAX, EV_REL); SPRINTF_BIT_B2(absbit, "ABS=", ABS_MAX, EV_ABS); SPRINTF_BIT_B2(mscbit, "MSC=", MSC_MAX, EV_MSC); SPRINTF_BIT_B2(ledbit, "LED=", LED_MAX, EV_LED); SPRINTF_BIT_B2(sndbit, "SND=", SND_MAX, EV_SND); SPRINTF_BIT_B2(ffbit, "FF=", FF_MAX, EV_FF); SPRINTF_BIT_B2(swbit, "SW=", SW_MAX, EV_SW); len += sprintf(buf + len, "\n"); at += len; if (at >= pos) { if (!*start) { *start = buf + (pos - (at - len)); cnt = at - pos; } else cnt += len; buf += len; if (cnt >= count) break; } } if (&dev->node == &input_dev_list) *eof = 1; return (count > cnt) ? cnt : count; } static int input_handlers_read(char *buf, char **start, off_t pos, int count, int *eof, void *data) { struct input_handler *handler; off_t at = 0; int len = 0, cnt = 0; int i = 0; list_for_each_entry(handler, &input_handler_list, node) { if (handler->fops) len = sprintf(buf, "N: Number=%d Name=%s Minor=%d\n", i++, handler->name, handler->minor); else len = sprintf(buf, "N: Number=%d Name=%s\n", i++, handler->name); at += len; if (at >= pos) { if (!*start) { *start = buf + (pos - (at - len)); cnt = at - pos; } else cnt += len; buf += len; if (cnt >= count) break; } } if (&handler->node == &input_handler_list) *eof = 1; return (count > cnt) ? cnt : count; } static struct file_operations input_fileops; static int __init input_proc_init(void) { struct proc_dir_entry *entry; proc_bus_input_dir = proc_mkdir("input", proc_bus); if (!proc_bus_input_dir) return -ENOMEM; proc_bus_input_dir->owner = THIS_MODULE; entry = create_proc_read_entry("devices", 0, proc_bus_input_dir, input_devices_read, NULL); if (!entry) goto fail1; entry->owner = THIS_MODULE; input_fileops = *entry->proc_fops; entry->proc_fops = &input_fileops; entry->proc_fops->poll = input_devices_poll; entry = create_proc_read_entry("handlers", 0, proc_bus_input_dir, input_handlers_read, NULL); if (!entry) goto fail2; entry->owner = THIS_MODULE; return 0; fail2: remove_proc_entry("devices", proc_bus_input_dir); fail1: remove_proc_entry("input", proc_bus); return -ENOMEM; } static void input_proc_exit(void) { remove_proc_entry("devices", proc_bus_input_dir); remove_proc_entry("handlers", proc_bus_input_dir); remove_proc_entry("input", proc_bus); } #else /* !CONFIG_PROC_FS */ static inline void input_wakeup_procfs_readers(void) { } static inline int input_proc_init(void) { return 0; } static inline void input_proc_exit(void) { } #endif static void input_dev_release(struct class_device *class_dev) { struct input_dev *dev = to_input_dev(class_dev); kfree(dev); module_put(THIS_MODULE); } static struct class input_dev_class = { .name = "input_dev", .release = input_dev_release, }; struct input_dev *input_allocate_device(void) { struct input_dev *dev; dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); if (dev) { dev->dynalloc = 1; dev->cdev.class = &input_dev_class; class_device_initialize(&dev->cdev); INIT_LIST_HEAD(&dev->h_list); INIT_LIST_HEAD(&dev->node); } return dev; } static void input_register_classdevice(struct input_dev *dev) { static atomic_t input_no = ATOMIC_INIT(0); const char *path; __module_get(THIS_MODULE); dev->dev = dev->cdev.dev; snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id), "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1); path = kobject_get_path(&dev->cdev.class->subsys.kset.kobj, GFP_KERNEL); printk(KERN_INFO "input: %s/%s as %s\n", dev->name ? dev->name : "Unspecified device", path ? path : "", dev->cdev.class_id); kfree(path); class_device_add(&dev->cdev); } void input_register_device(struct input_dev *dev) { struct input_handle *handle; struct input_handler *handler; struct input_device_id *id; set_bit(EV_SYN, dev->evbit); init_MUTEX(&dev->sem); /* * If delay and period are pre-set by the driver, then autorepeating * is handled by the driver itself and we don't do it in input.c. */ init_timer(&dev->timer); if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) { dev->timer.data = (long) dev; dev->timer.function = input_repeat_key; dev->rep[REP_DELAY] = 250; dev->rep[REP_PERIOD] = 33; } INIT_LIST_HEAD(&dev->h_list); list_add_tail(&dev->node, &input_dev_list); list_for_each_entry(handler, &input_handler_list, node) if (!handler->blacklist || !input_match_device(handler->blacklist, dev)) if ((id = input_match_device(handler->id_table, dev))) if ((handle = handler->connect(handler, dev, id))) input_link_handle(handle); if (dev->dynalloc) input_register_classdevice(dev); #ifdef CONFIG_HOTPLUG input_call_hotplug("add", dev); #endif input_wakeup_procfs_readers(); } void input_unregister_device(struct input_dev *dev) { struct list_head * node, * next; if (!dev) return; del_timer_sync(&dev->timer); list_for_each_safe(node, next, &dev->h_list) { struct input_handle * handle = to_handle(node); list_del_init(&handle->d_node); list_del_init(&handle->h_node); handle->handler->disconnect(handle); } #ifdef CONFIG_HOTPLUG input_call_hotplug("remove", dev); #endif list_del_init(&dev->node); if (dev->dynalloc) class_device_unregister(&dev->cdev); input_wakeup_procfs_readers(); } void input_register_handler(struct input_handler *handler) { struct input_dev *dev; struct input_handle *handle; struct input_device_id *id; if (!handler) return; INIT_LIST_HEAD(&handler->h_list); if (handler->fops != NULL) input_table[handler->minor >> 5] = handler; list_add_tail(&handler->node, &input_handler_list); list_for_each_entry(dev, &input_dev_list, node) if (!handler->blacklist || !input_match_device(handler->blacklist, dev)) if ((id = input_match_device(handler->id_table, dev))) if ((handle = handler->connect(handler, dev, id))) input_link_handle(handle); input_wakeup_procfs_readers(); } void input_unregister_handler(struct input_handler *handler) { struct list_head * node, * next; list_for_each_safe(node, next, &handler->h_list) { struct input_handle * handle = to_handle_h(node); list_del_init(&handle->h_node); list_del_init(&handle->d_node); handler->disconnect(handle); } list_del_init(&handler->node); if (handler->fops != NULL) input_table[handler->minor >> 5] = NULL; input_wakeup_procfs_readers(); } static int input_open_file(struct inode *inode, struct file *file) { struct input_handler *handler = input_table[iminor(inode) >> 5]; struct file_operations *old_fops, *new_fops = NULL; int err; /* No load-on-demand here? */ if (!handler || !(new_fops = fops_get(handler->fops))) return -ENODEV; /* * That's _really_ odd. Usually NULL ->open means "nothing special", * not "no device". Oh, well... */ if (!new_fops->open) { fops_put(new_fops); return -ENODEV; } old_fops = file->f_op; file->f_op = new_fops; err = new_fops->open(inode, file); if (err) { fops_put(file->f_op); file->f_op = fops_get(old_fops); } fops_put(old_fops); return err; } static struct file_operations input_fops = { .owner = THIS_MODULE, .open = input_open_file, }; struct class *input_class; static int __init input_init(void) { int err; err = class_register(&input_dev_class); if (err) { printk(KERN_ERR "input: unable to register input_dev class\n"); return err; } input_class = class_create(THIS_MODULE, "input"); if (IS_ERR(input_class)) { printk(KERN_ERR "input: unable to register input class\n"); err = PTR_ERR(input_class); goto fail1; } err = input_proc_init(); if (err) goto fail2; err = register_chrdev(INPUT_MAJOR, "input", &input_fops); if (err) { printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR); goto fail3; } return 0; fail3: input_proc_exit(); fail2: class_destroy(input_class); fail1: class_unregister(&input_dev_class); return err; } static void __exit input_exit(void) { input_proc_exit(); unregister_chrdev(INPUT_MAJOR, "input"); class_destroy(input_class); class_unregister(&input_dev_class); } subsys_initcall(input_init); module_exit(input_exit);