/* * 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 <linux/init.h> #include <linux/sched.h> #include <linux/smp_lock.h> #include <linux/input.h> #include <linux/module.h> #include <linux/random.h> #include <linux/major.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <linux/interrupt.h> #include <linux/poll.h> #include <linux/device.h> #include <linux/mutex.h> MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); 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_GPL(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 = mutex_lock_interruptible(&dev->mutex); if (err) return err; handle->open++; if (!dev->users++ && dev->open) err = dev->open(dev); if (err) handle->open--; mutex_unlock(&dev->mutex); 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); mutex_lock(&dev->mutex); if (!--dev->users && dev->close) dev->close(dev); handle->open--; mutex_unlock(&dev->mutex); } 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; } #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_proc_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; } static struct list_head *list_get_nth_element(struct list_head *list, loff_t *pos) { struct list_head *node; loff_t i = 0; list_for_each(node, list) if (i++ == *pos) return node; return NULL; } static struct list_head *list_get_next_element(struct list_head *list, struct list_head *element, loff_t *pos) { if (element->next == list) return NULL; ++(*pos); return element->next; } static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) { /* acquire lock here ... Yes, we do need locking, I knowi, I know... */ return list_get_nth_element(&input_dev_list, pos); } static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) { return list_get_next_element(&input_dev_list, v, pos); } static void input_devices_seq_stop(struct seq_file *seq, void *v) { /* release lock here */ } static void input_seq_print_bitmap(struct seq_file *seq, const char *name, unsigned long *bitmap, int max) { int i; for (i = NBITS(max) - 1; i > 0; i--) if (bitmap[i]) break; seq_printf(seq, "B: %s=", name); for (; i >= 0; i--) seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : ""); seq_putc(seq, '\n'); } static int input_devices_seq_show(struct seq_file *seq, void *v) { struct input_dev *dev = container_of(v, struct input_dev, node); const char *path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL); struct input_handle *handle; seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : ""); seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : ""); seq_printf(seq, "S: Sysfs=%s\n", path ? path : ""); seq_printf(seq, "H: Handlers="); list_for_each_entry(handle, &dev->h_list, d_node) seq_printf(seq, "%s ", handle->name); seq_putc(seq, '\n'); input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); if (test_bit(EV_KEY, dev->evbit)) input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); if (test_bit(EV_REL, dev->evbit)) input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); if (test_bit(EV_ABS, dev->evbit)) input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); if (test_bit(EV_MSC, dev->evbit)) input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); if (test_bit(EV_LED, dev->evbit)) input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); if (test_bit(EV_SND, dev->evbit)) input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); if (test_bit(EV_FF, dev->evbit)) input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); if (test_bit(EV_SW, dev->evbit)) input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); seq_putc(seq, '\n'); kfree(path); return 0; } static struct seq_operations input_devices_seq_ops = { .start = input_devices_seq_start, .next = input_devices_seq_next, .stop = input_devices_seq_stop, .show = input_devices_seq_show, }; static int input_proc_devices_open(struct inode *inode, struct file *file) { return seq_open(file, &input_devices_seq_ops); } static struct file_operations input_devices_fileops = { .owner = THIS_MODULE, .open = input_proc_devices_open, .poll = input_proc_devices_poll, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) { /* acquire lock here ... Yes, we do need locking, I knowi, I know... */ seq->private = (void *)(unsigned long)*pos; return list_get_nth_element(&input_handler_list, pos); } static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) { seq->private = (void *)(unsigned long)(*pos + 1); return list_get_next_element(&input_handler_list, v, pos); } static void input_handlers_seq_stop(struct seq_file *seq, void *v) { /* release lock here */ } static int input_handlers_seq_show(struct seq_file *seq, void *v) { struct input_handler *handler = container_of(v, struct input_handler, node); seq_printf(seq, "N: Number=%ld Name=%s", (unsigned long)seq->private, handler->name); if (handler->fops) seq_printf(seq, " Minor=%d", handler->minor); seq_putc(seq, '\n'); return 0; } static struct seq_operations input_handlers_seq_ops = { .start = input_handlers_seq_start, .next = input_handlers_seq_next, .stop = input_handlers_seq_stop, .show = input_handlers_seq_show, }; static int input_proc_handlers_open(struct inode *inode, struct file *file) { return seq_open(file, &input_handlers_seq_ops); } static struct file_operations input_handlers_fileops = { .owner = THIS_MODULE, .open = input_proc_handlers_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; 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_entry("devices", 0, proc_bus_input_dir); if (!entry) goto fail1; entry->owner = THIS_MODULE; entry->proc_fops = &input_devices_fileops; entry = create_proc_entry("handlers", 0, proc_bus_input_dir); if (!entry) goto fail2; entry->owner = THIS_MODULE; entry->proc_fops = &input_handlers_fileops; 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 #define INPUT_DEV_STRING_ATTR_SHOW(name) \ static ssize_t input_dev_show_##name(struct class_device *dev, char *buf) \ { \ struct input_dev *input_dev = to_input_dev(dev); \ int retval; \ \ retval = mutex_lock_interruptible(&input_dev->mutex); \ if (retval) \ return retval; \ \ retval = scnprintf(buf, PAGE_SIZE, \ "%s\n", input_dev->name ? input_dev->name : ""); \ \ mutex_unlock(&input_dev->mutex); \ \ return retval; \ } \ static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL); INPUT_DEV_STRING_ATTR_SHOW(name); INPUT_DEV_STRING_ATTR_SHOW(phys); INPUT_DEV_STRING_ATTR_SHOW(uniq); static int input_print_modalias_bits(char *buf, int size, char name, unsigned long *bm, unsigned int min_bit, unsigned int max_bit) { int len = 0, i; len += snprintf(buf, max(size, 0), "%c", name); for (i = min_bit; i < max_bit; i++) if (bm[LONG(i)] & BIT(i)) len += snprintf(buf + len, max(size - len, 0), "%X,", i); return len; } static int input_print_modalias(char *buf, int size, struct input_dev *id, int add_cr) { int len; len = snprintf(buf, max(size, 0), "input:b%04Xv%04Xp%04Xe%04X-", id->id.bustype, id->id.vendor, id->id.product, id->id.version); len += input_print_modalias_bits(buf + len, size - len, 'e', id->evbit, 0, EV_MAX); len += input_print_modalias_bits(buf + len, size - len, 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); len += input_print_modalias_bits(buf + len, size - len, 'r', id->relbit, 0, REL_MAX); len += input_print_modalias_bits(buf + len, size - len, 'a', id->absbit, 0, ABS_MAX); len += input_print_modalias_bits(buf + len, size - len, 'm', id->mscbit, 0, MSC_MAX); len += input_print_modalias_bits(buf + len, size - len, 'l', id->ledbit, 0, LED_MAX); len += input_print_modalias_bits(buf + len, size - len, 's', id->sndbit, 0, SND_MAX); len += input_print_modalias_bits(buf + len, size - len, 'f', id->ffbit, 0, FF_MAX); len += input_print_modalias_bits(buf + len, size - len, 'w', id->swbit, 0, SW_MAX); if (add_cr) len += snprintf(buf + len, max(size - len, 0), "\n"); return len; } static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf) { struct input_dev *id = to_input_dev(dev); ssize_t len; len = input_print_modalias(buf, PAGE_SIZE, id, 1); return max_t(int, len, PAGE_SIZE); } static CLASS_DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); static struct attribute *input_dev_attrs[] = { &class_device_attr_name.attr, &class_device_attr_phys.attr, &class_device_attr_uniq.attr, &class_device_attr_modalias.attr, NULL }; static struct attribute_group input_dev_attr_group = { .attrs = input_dev_attrs, }; #define INPUT_DEV_ID_ATTR(name) \ static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf) \ { \ struct input_dev *input_dev = to_input_dev(dev); \ return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \ } \ static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL); INPUT_DEV_ID_ATTR(bustype); INPUT_DEV_ID_ATTR(vendor); INPUT_DEV_ID_ATTR(product); INPUT_DEV_ID_ATTR(version); static struct attribute *input_dev_id_attrs[] = { &class_device_attr_bustype.attr, &class_device_attr_vendor.attr, &class_device_attr_product.attr, &class_device_attr_version.attr, NULL }; static struct attribute_group input_dev_id_attr_group = { .name = "id", .attrs = input_dev_id_attrs, }; static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, int max, int add_cr) { int i; int len = 0; for (i = NBITS(max) - 1; i > 0; i--) if (bitmap[i]) break; for (; i >= 0; i--) len += snprintf(buf + len, max(buf_size - len, 0), "%lx%s", bitmap[i], i > 0 ? " " : ""); if (add_cr) len += snprintf(buf + len, max(buf_size - len, 0), "\n"); return len; } #define INPUT_DEV_CAP_ATTR(ev, bm) \ static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf) \ { \ struct input_dev *input_dev = to_input_dev(dev); \ int len = input_print_bitmap(buf, PAGE_SIZE, \ input_dev->bm##bit, ev##_MAX, 1); \ return min_t(int, len, PAGE_SIZE); \ } \ static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL); INPUT_DEV_CAP_ATTR(EV, ev); INPUT_DEV_CAP_ATTR(KEY, key); INPUT_DEV_CAP_ATTR(REL, rel); INPUT_DEV_CAP_ATTR(ABS, abs); INPUT_DEV_CAP_ATTR(MSC, msc); INPUT_DEV_CAP_ATTR(LED, led); INPUT_DEV_CAP_ATTR(SND, snd); INPUT_DEV_CAP_ATTR(FF, ff); INPUT_DEV_CAP_ATTR(SW, sw); static struct attribute *input_dev_caps_attrs[] = { &class_device_attr_ev.attr, &class_device_attr_key.attr, &class_device_attr_rel.attr, &class_device_attr_abs.attr, &class_device_attr_msc.attr, &class_device_attr_led.attr, &class_device_attr_snd.attr, &class_device_attr_ff.attr, &class_device_attr_sw.attr, NULL }; static struct attribute_group input_dev_caps_attr_group = { .name = "capabilities", .attrs = input_dev_caps_attrs, }; 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); } /* * Input uevent interface - loading event handlers based on * device bitfields. */ static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index, char *buffer, int buffer_size, int *cur_len, const char *name, unsigned long *bitmap, int max) { if (*cur_index >= num_envp - 1) return -ENOMEM; envp[*cur_index] = buffer + *cur_len; *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name); if (*cur_len >= buffer_size) return -ENOMEM; *cur_len += input_print_bitmap(buffer + *cur_len, max(buffer_size - *cur_len, 0), bitmap, max, 0) + 1; if (*cur_len > buffer_size) return -ENOMEM; (*cur_index)++; return 0; } static int input_add_uevent_modalias_var(char **envp, int num_envp, int *cur_index, char *buffer, int buffer_size, int *cur_len, struct input_dev *dev) { if (*cur_index >= num_envp - 1) return -ENOMEM; envp[*cur_index] = buffer + *cur_len; *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), "MODALIAS="); if (*cur_len >= buffer_size) return -ENOMEM; *cur_len += input_print_modalias(buffer + *cur_len, max(buffer_size - *cur_len, 0), dev, 0) + 1; if (*cur_len > buffer_size) return -ENOMEM; (*cur_index)++; return 0; } #define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \ do { \ int err = add_uevent_var(envp, num_envp, &i, \ buffer, buffer_size, &len, \ fmt, val); \ if (err) \ return err; \ } while (0) #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \ do { \ int err = input_add_uevent_bm_var(envp, num_envp, &i, \ buffer, buffer_size, &len, \ name, bm, max); \ if (err) \ return err; \ } while (0) #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \ do { \ int err = input_add_uevent_modalias_var(envp, \ num_envp, &i, \ buffer, buffer_size, &len, \ dev); \ if (err) \ return err; \ } while (0) static int input_dev_uevent(struct class_device *cdev, char **envp, int num_envp, char *buffer, int buffer_size) { struct input_dev *dev = to_input_dev(cdev); int i = 0; int len = 0; INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x", dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); if (dev->name) INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); if (dev->phys) INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); if (dev->uniq) INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX); if (test_bit(EV_KEY, dev->evbit)) INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX); if (test_bit(EV_REL, dev->evbit)) INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX); if (test_bit(EV_ABS, dev->evbit)) INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX); if (test_bit(EV_MSC, dev->evbit)) INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX); if (test_bit(EV_LED, dev->evbit)) INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX); if (test_bit(EV_SND, dev->evbit)) INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX); if (test_bit(EV_FF, dev->evbit)) INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX); if (test_bit(EV_SW, dev->evbit)) INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); envp[i] = NULL; return 0; } struct class input_class = { .name = "input", .release = input_dev_release, .uevent = input_dev_uevent, }; 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_class; class_device_initialize(&dev->cdev); INIT_LIST_HEAD(&dev->h_list); INIT_LIST_HEAD(&dev->node); } return dev; } int input_register_device(struct input_dev *dev) { static atomic_t input_no = ATOMIC_INIT(0); struct input_handle *handle; struct input_handler *handler; struct input_device_id *id; const char *path; int error; if (!dev->dynalloc) { printk(KERN_WARNING "input: device %s is statically allocated, will not register\n" "Please convert to input_allocate_device() or contact dtor_core@ameritech.net\n", dev->name ? dev->name : "<Unknown>"); return -EINVAL; } mutex_init(&dev->mutex); set_bit(EV_SYN, dev->evbit); /* * 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); dev->cdev.class = &input_class; snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id), "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1); error = class_device_add(&dev->cdev); if (error) return error; error = sysfs_create_group(&dev->cdev.kobj, &input_dev_attr_group); if (error) goto fail1; error = sysfs_create_group(&dev->cdev.kobj, &input_dev_id_attr_group); if (error) goto fail2; error = sysfs_create_group(&dev->cdev.kobj, &input_dev_caps_attr_group); if (error) goto fail3; __module_get(THIS_MODULE); path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL); printk(KERN_INFO "input: %s as %s\n", dev->name ? dev->name : "Unspecified device", path ? path : "N/A"); kfree(path); 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); input_wakeup_procfs_readers(); return 0; fail3: sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group); fail2: sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group); fail1: class_device_del(&dev->cdev); return error; } 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); } list_del_init(&dev->node); sysfs_remove_group(&dev->cdev.kobj, &input_dev_caps_attr_group); sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group); sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group); 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]; const 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, }; static int __init input_init(void) { int err; err = class_register(&input_class); if (err) { printk(KERN_ERR "input: unable to register input_dev class\n"); return err; } err = input_proc_init(); if (err) goto fail1; err = register_chrdev(INPUT_MAJOR, "input", &input_fops); if (err) { printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR); goto fail2; } return 0; fail2: input_proc_exit(); fail1: class_unregister(&input_class); return err; } static void __exit input_exit(void) { input_proc_exit(); unregister_chrdev(INPUT_MAJOR, "input"); class_unregister(&input_class); } subsys_initcall(input_init); module_exit(input_exit);