/* * Event char devices, giving access to raw input device events. * * 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. */ #define EVDEV_MINOR_BASE 64#define EVDEV_MINORS 32#define EVDEV_BUFFER_SIZE 64 #include <linux/poll.h>#include <linux/slab.h>#include <linux/module.h>#include <linux/init.h>#include <linux/input.h>#include <linux/major.h>#include <linux/smp_lock.h>#include <linux/device.h>#include <linux/compat.h> struct evdev { int exist; int open; int minor; char name[16]; struct input_handle handle; wait_queue_head_t wait; struct evdev_list *grab; struct list_head list;}; struct evdev_list { struct input_event buffer[EVDEV_BUFFER_SIZE]; int head; int tail; struct fasync_struct *fasync; struct evdev *evdev; struct list_head node;}; static struct evdev *evdev_table[EVDEV_MINORS]; static void evdev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value){ struct evdev *evdev = handle->private; struct evdev_list *list; if (evdev->grab) { list = evdev->grab; do_gettimeofday(&list->buffer[list->head].time); list->buffer[list->head].type = type; list->buffer[list->head].code = code; list->buffer[list->head].value = value; list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1); kill_fasync(&list->fasync, SIGIO, POLL_IN); } else list_for_each_entry(list, &evdev->list, node) { do_gettimeofday(&list->buffer[list->head].time); list->buffer[list->head].type = type; list->buffer[list->head].code = code; list->buffer[list->head].value = value; list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1); kill_fasync(&list->fasync, SIGIO, POLL_IN); } wake_up_interruptible(&evdev->wait);} static int evdev_fasync(int fd, struct file *file, int on){ int retval; struct evdev_list *list = file->private_data; retval = fasync_helper(fd, file, on, &list->fasync); return retval < 0 ? retval : 0;} static int evdev_flush(struct file * file){ struct evdev_list *list = file->private_data; if (!list->evdev->exist) return -ENODEV; return input_flush_device(&list->evdev->handle, file);} static void evdev_free(struct evdev *evdev){ evdev_table[evdev->minor] = NULL; kfree(evdev);} static int evdev_release(struct inode * inode, struct file * file){ struct evdev_list *list = file->private_data; if (list->evdev->grab == list) { input_release_device(&list->evdev->handle); list->evdev->grab = NULL; } evdev_fasync(-1, file, 0); list_del(&list->node); if (!--list->evdev->open) { if (list->evdev->exist) input_close_device(&list->evdev->handle); else evdev_free(list->evdev); } kfree(list); return 0;} static int evdev_open(struct inode * inode, struct file * file){ struct evdev_list *list; int i = iminor(inode) - EVDEV_MINOR_BASE; int accept_err; if (i >= EVDEV_MINORS || !evdev_table[i] || !evdev_table[i]->exist) return -ENODEV; if ((accept_err = input_accept_process(&(evdev_table[i]->handle), file))) return accept_err; if (!(list = kzalloc(sizeof(struct evdev_list), GFP_KERNEL))) return -ENOMEM; list->evdev = evdev_table[i]; list_add_tail(&list->node, &evdev_table[i]->list); file->private_data = list; if (!list->evdev->open++) if (list->evdev->exist) input_open_device(&list->evdev->handle); return 0;} #ifdef CONFIG_COMPAT struct input_event_compat { struct compat_timeval time; __u16 type; __u16 code; __s32 value;}; /* Note to the author of this code: did it ever occur to you why the ifdefs are needed? Think about it again. -AK */#ifdef CONFIG_X86_64# define COMPAT_TEST is_compat_task()#elif defined(CONFIG_IA64)# define COMPAT_TEST IS_IA32_PROCESS(task_pt_regs(current))#elif defined(CONFIG_S390)# define COMPAT_TEST test_thread_flag(TIF_31BIT)#elif defined(CONFIG_MIPS)# define COMPAT_TEST (current->thread.mflags & MF_32BIT_ADDR)#else# define COMPAT_TEST test_thread_flag(TIF_32BIT)#endif static inline size_t evdev_event_size(void){ return COMPAT_TEST ? sizeof(struct input_event_compat) : sizeof(struct input_event);} static int evdev_event_from_user(const char __user *buffer, struct input_event *event){ if (COMPAT_TEST) { struct input_event_compat compat_event; if (copy_from_user(&compat_event, buffer, sizeof(struct input_event_compat))) return -EFAULT; event->time.tv_sec = compat_event.time.tv_sec; event->time.tv_usec = compat_event.time.tv_usec; event->type = compat_event.type; event->code = compat_event.code; event->value = compat_event.value; } else { if (copy_from_user(event, buffer, sizeof(struct input_event))) return -EFAULT; } return 0;} static int evdev_event_to_user(char __user *buffer, const struct input_event *event){ if (COMPAT_TEST) { struct input_event_compat compat_event; compat_event.time.tv_sec = event->time.tv_sec; compat_event.time.tv_usec = event->time.tv_usec; compat_event.type = event->type; compat_event.code = event->code; compat_event.value = event->value; if (copy_to_user(buffer, &compat_event, sizeof(struct input_event_compat))) return -EFAULT; } else { if (copy_to_user(buffer, event, sizeof(struct input_event))) return -EFAULT; } return 0;} #else static inline size_t evdev_event_size(void){ return sizeof(struct input_event);} static int evdev_event_from_user(const char __user *buffer, struct input_event *event){ if (copy_from_user(event, buffer, sizeof(struct input_event))) return -EFAULT; return 0;} static int evdev_event_to_user(char __user *buffer, const struct input_event *event){ if (copy_to_user(buffer, event, sizeof(struct input_event))) return -EFAULT; return 0;} #endif /* CONFIG_COMPAT */ static ssize_t evdev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos){ struct evdev_list *list = file->private_data; struct input_event event; int retval = 0; if (!list->evdev->exist) return -ENODEV; while (retval < count) { if (evdev_event_from_user(buffer + retval, &event)) return -EFAULT; input_event(list->evdev->handle.dev, event.type, event.code, event.value); retval += evdev_event_size(); } return retval;} static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos){ struct evdev_list *list = file->private_data; int retval; if (count < evdev_event_size()) return -EINVAL; if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK)) return -EAGAIN; retval = wait_event_interruptible(list->evdev->wait, list->head != list->tail || (!list->evdev->exist)); if (retval) return retval; if (!list->evdev->exist) return -ENODEV; while (list->head != list->tail && retval + evdev_event_size() <= count) { struct input_event *event = (struct input_event *) list->buffer + list->tail; if (evdev_event_to_user(buffer + retval, event)) return -EFAULT; list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1); retval += evdev_event_size(); } return retval;} /* No kernel lock - fine */static unsigned int evdev_poll(struct file *file, poll_table *wait){ struct evdev_list *list = file->private_data; poll_wait(file, &list->evdev->wait, wait); return ((list->head == list->tail) ? 0 : (POLLIN | POLLRDNORM)) | (list->evdev->exist ? 0 : (POLLHUP | POLLERR));} #ifdef CONFIG_COMPAT #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)#define NBITS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1) #ifdef __BIG_ENDIANstatic int bits_to_user(unsigned long *bits, unsigned int maxbit, unsigned int maxlen, void __user *p, int compat){ int len, i; if (compat) { len = NBITS_COMPAT(maxbit) * sizeof(compat_long_t); if (len < maxlen) len = maxlen; for (i = 0; i < len / sizeof(compat_long_t); i++) if (copy_to_user((compat_long_t __user *) p + i, (compat_long_t *) bits + i + 1 - ((i % 2) << 1), sizeof(compat_long_t))) return -EFAULT; } else { len = NBITS(maxbit) * sizeof(long); if (len > maxlen) len = maxlen; if (copy_to_user(p, bits, len)) return -EFAULT; } return len;}#elsestatic int bits_to_user(unsigned long *bits, unsigned int maxbit, unsigned int maxlen, void __user *p, int compat){ int len = compat ? NBITS_COMPAT(maxbit) * sizeof(compat_long_t) : NBITS(maxbit) * sizeof(long); if (len > maxlen) len = maxlen; return copy_to_user(p, bits, len) ? -EFAULT : len;}#endif /* __BIG_ENDIAN */ #else static int bits_to_user(unsigned long *bits, unsigned int maxbit, unsigned int maxlen, void __user *p, int compat){ int len = NBITS(maxbit) * sizeof(long); if (len > maxlen) len = maxlen; return copy_to_user(p, bits, len) ? -EFAULT : len;} #endif /* CONFIG_COMPAT */ static int str_to_user(const char *str, unsigned int maxlen, void __user *p){ int len; if (!str) return -ENOENT; len = strlen(str) + 1; if (len > maxlen) len = maxlen; return copy_to_user(p, str, len) ? -EFAULT : len;} static long evdev_ioctl_handler(struct file *file, unsigned int cmd, void __user *p, int compat_mode){ struct evdev_list *list = file->private_data; struct evdev *evdev = list->evdev; struct input_dev *dev = evdev->handle.dev; struct input_absinfo abs; int __user *ip = (int __user *)p; int i, t, u, v; if (!evdev->exist) return -ENODEV; switch (cmd) { case EVIOCGVERSION: return put_user(EV_VERSION, ip); case EVIOCGID: if (copy_to_user(p, &dev->id, sizeof(struct input_id))) return -EFAULT; return 0; case EVIOCGKEYCODE: if (get_user(t, ip)) return -EFAULT; if (t < 0 || t >= dev->keycodemax || !dev->keycodesize) return -EINVAL; if (put_user(INPUT_KEYCODE(dev, t), ip + 1)) return -EFAULT; return 0; case EVIOCSKEYCODE: if (get_user(t, ip)) return -EFAULT; if (t < 0 || t >= dev->keycodemax || !dev->keycodesize) return -EINVAL; if (get_user(v, ip + 1)) return -EFAULT; if (v < 0 || v > KEY_MAX) return -EINVAL; if (dev->keycodesize < sizeof(v) && (v >> (dev->keycodesize * 8))) return -EINVAL; u = SET_INPUT_KEYCODE(dev, t, v); clear_bit(u, dev->keybit); set_bit(v, dev->keybit); for (i = 0; i < dev->keycodemax; i++) if (INPUT_KEYCODE(dev, i) == u) set_bit(u, dev->keybit); return 0; case EVIOCSFF: if (dev->upload_effect) { struct ff_effect effect; int err; if (copy_from_user(&effect, p, sizeof(effect))) return -EFAULT; err = dev->upload_effect(dev, &effect); if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) return -EFAULT; return err; } else return -ENOSYS; case EVIOCRMFF: if (!dev->erase_effect) return -ENOSYS; return dev->erase_effect(dev, (int)(unsigned long) p); case EVIOCGEFFECTS: if (put_user(dev->ff_effects_max, ip)) return -EFAULT; return 0; case EVIOCGRAB: if (p) { if (evdev->grab) return -EBUSY; if (input_grab_device(&evdev->handle)) return -EBUSY; evdev->grab = list; return 0; } else { if (evdev->grab != list) return -EINVAL; input_release_device(&evdev->handle); evdev->grab = NULL; return 0; } default: if (_IOC_TYPE(cmd) != 'E') return -EINVAL; if (_IOC_DIR(cmd) == _IOC_READ) { if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) { long *bits; int len; switch (_IOC_NR(cmd) & EV_MAX) { case 0: bits = dev->evbit; len = EV_MAX; break; case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; case EV_REL: bits = dev->relbit; len = REL_MAX; break; case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; case EV_LED: bits = dev->ledbit; len = LED_MAX; break; case EV_SND: bits = dev->sndbit; len = SND_MAX; break; case EV_FF: bits = dev->ffbit; len = FF_MAX; break;Lines 1–500 of 690. 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/* * Event char devices, giving access to raw input device events. * * 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. */ #define EVDEV_MINOR_BASE 64 #define EVDEV_MINORS 32 #define EVDEV_BUFFER_SIZE 64 #include <linux/poll.h> #include <linux/slab.h> #include <linux/module.h> #include <linux/init.h> #include <linux/input.h> #include <linux/major.h> #include <linux/smp_lock.h> #include <linux/device.h> #include <linux/compat.h> struct evdev { int exist; int open; int minor; char name[16]; struct input_handle handle; wait_queue_head_t wait; struct evdev_list *grab; struct list_head list; }; struct evdev_list { struct input_event buffer[EVDEV_BUFFER_SIZE]; int head; int tail; struct fasync_struct *fasync; struct evdev *evdev; struct list_head node; }; static struct evdev *evdev_table[EVDEV_MINORS]; static void evdev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value) { struct evdev *evdev = handle->private; struct evdev_list *list; if (evdev->grab) { list = evdev->grab; do_gettimeofday(&list->buffer[list->head].time); list->buffer[list->head].type = type; list->buffer[list->head].code = code; list->buffer[list->head].value = value; list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1); kill_fasync(&list->fasync, SIGIO, POLL_IN); } else list_for_each_entry(list, &evdev->list, node) { do_gettimeofday(&list->buffer[list->head].time); list->buffer[list->head].type = type; list->buffer[list->head].code = code; list->buffer[list->head].value = value; list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1); kill_fasync(&list->fasync, SIGIO, POLL_IN); } wake_up_interruptible(&evdev->wait); } static int evdev_fasync(int fd, struct file *file, int on) { int retval; struct evdev_list *list = file->private_data; retval = fasync_helper(fd, file, on, &list->fasync); return retval < 0 ? retval : 0; } static int evdev_flush(struct file * file) { struct evdev_list *list = file->private_data; if (!list->evdev->exist) return -ENODEV; return input_flush_device(&list->evdev->handle, file); } static void evdev_free(struct evdev *evdev) { evdev_table[evdev->minor] = NULL; kfree(evdev); } static int evdev_release(struct inode * inode, struct file * file) { struct evdev_list *list = file->private_data; if (list->evdev->grab == list) { input_release_device(&list->evdev->handle); list->evdev->grab = NULL; } evdev_fasync(-1, file, 0); list_del(&list->node); if (!--list->evdev->open) { if (list->evdev->exist) input_close_device(&list->evdev->handle); else evdev_free(list->evdev); } kfree(list); return 0; } static int evdev_open(struct inode * inode, struct file * file) { struct evdev_list *list; int i = iminor(inode) - EVDEV_MINOR_BASE; int accept_err; if (i >= EVDEV_MINORS || !evdev_table[i] || !evdev_table[i]->exist) return -ENODEV; if ((accept_err = input_accept_process(&(evdev_table[i]->handle), file))) return accept_err; if (!(list = kzalloc(sizeof(struct evdev_list), GFP_KERNEL))) return -ENOMEM; list->evdev = evdev_table[i]; list_add_tail(&list->node, &evdev_table[i]->list); file->private_data = list; if (!list->evdev->open++) if (list->evdev->exist) input_open_device(&list->evdev->handle); return 0; } #ifdef CONFIG_COMPAT struct input_event_compat { struct compat_timeval time; __u16 type; __u16 code; __s32 value; }; /* Note to the author of this code: did it ever occur to you why the ifdefs are needed? Think about it again. -AK */ #ifdef CONFIG_X86_64 # define COMPAT_TEST is_compat_task() #elif defined(CONFIG_IA64) # define COMPAT_TEST IS_IA32_PROCESS(task_pt_regs(current)) #elif defined(CONFIG_S390) # define COMPAT_TEST test_thread_flag(TIF_31BIT) #elif defined(CONFIG_MIPS) # define COMPAT_TEST (current->thread.mflags & MF_32BIT_ADDR) #else # define COMPAT_TEST test_thread_flag(TIF_32BIT) #endif static inline size_t evdev_event_size(void) { return COMPAT_TEST ? sizeof(struct input_event_compat) : sizeof(struct input_event); } static int evdev_event_from_user(const char __user *buffer, struct input_event *event) { if (COMPAT_TEST) { struct input_event_compat compat_event; if (copy_from_user(&compat_event, buffer, sizeof(struct input_event_compat))) return -EFAULT; event->time.tv_sec = compat_event.time.tv_sec; event->time.tv_usec = compat_event.time.tv_usec; event->type = compat_event.type; event->code = compat_event.code; event->value = compat_event.value; } else { if (copy_from_user(event, buffer, sizeof(struct input_event))) return -EFAULT; } return 0; } static int evdev_event_to_user(char __user *buffer, const struct input_event *event) { if (COMPAT_TEST) { struct input_event_compat compat_event; compat_event.time.tv_sec = event->time.tv_sec; compat_event.time.tv_usec = event->time.tv_usec; compat_event.type = event->type; compat_event.code = event->code; compat_event.value = event->value; if (copy_to_user(buffer, &compat_event, sizeof(struct input_event_compat))) return -EFAULT; } else { if (copy_to_user(buffer, event, sizeof(struct input_event))) return -EFAULT; } return 0; } #else static inline size_t evdev_event_size(void) { return sizeof(struct input_event); } static int evdev_event_from_user(const char __user *buffer, struct input_event *event) { if (copy_from_user(event, buffer, sizeof(struct input_event))) return -EFAULT; return 0; } static int evdev_event_to_user(char __user *buffer, const struct input_event *event) { if (copy_to_user(buffer, event, sizeof(struct input_event))) return -EFAULT; return 0; } #endif /* CONFIG_COMPAT */ static ssize_t evdev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) { struct evdev_list *list = file->private_data; struct input_event event; int retval = 0; if (!list->evdev->exist) return -ENODEV; while (retval < count) { if (evdev_event_from_user(buffer + retval, &event)) return -EFAULT; input_event(list->evdev->handle.dev, event.type, event.code, event.value); retval += evdev_event_size(); } return retval; } static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos) { struct evdev_list *list = file->private_data; int retval; if (count < evdev_event_size()) return -EINVAL; if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK)) return -EAGAIN; retval = wait_event_interruptible(list->evdev->wait, list->head != list->tail || (!list->evdev->exist)); if (retval) return retval; if (!list->evdev->exist) return -ENODEV; while (list->head != list->tail && retval + evdev_event_size() <= count) { struct input_event *event = (struct input_event *) list->buffer + list->tail; if (evdev_event_to_user(buffer + retval, event)) return -EFAULT; list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1); retval += evdev_event_size(); } return retval; } /* No kernel lock - fine */ static unsigned int evdev_poll(struct file *file, poll_table *wait) { struct evdev_list *list = file->private_data; poll_wait(file, &list->evdev->wait, wait); return ((list->head == list->tail) ? 0 : (POLLIN | POLLRDNORM)) | (list->evdev->exist ? 0 : (POLLHUP | POLLERR)); } #ifdef CONFIG_COMPAT #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) #define NBITS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1) #ifdef __BIG_ENDIAN static int bits_to_user(unsigned long *bits, unsigned int maxbit, unsigned int maxlen, void __user *p, int compat) { int len, i; if (compat) { len = NBITS_COMPAT(maxbit) * sizeof(compat_long_t); if (len < maxlen) len = maxlen; for (i = 0; i < len / sizeof(compat_long_t); i++) if (copy_to_user((compat_long_t __user *) p + i, (compat_long_t *) bits + i + 1 - ((i % 2) << 1), sizeof(compat_long_t))) return -EFAULT; } else { len = NBITS(maxbit) * sizeof(long); if (len > maxlen) len = maxlen; if (copy_to_user(p, bits, len)) return -EFAULT; } return len; } #else static int bits_to_user(unsigned long *bits, unsigned int maxbit, unsigned int maxlen, void __user *p, int compat) { int len = compat ? NBITS_COMPAT(maxbit) * sizeof(compat_long_t) : NBITS(maxbit) * sizeof(long); if (len > maxlen) len = maxlen; return copy_to_user(p, bits, len) ? -EFAULT : len; } #endif /* __BIG_ENDIAN */ #else static int bits_to_user(unsigned long *bits, unsigned int maxbit, unsigned int maxlen, void __user *p, int compat) { int len = NBITS(maxbit) * sizeof(long); if (len > maxlen) len = maxlen; return copy_to_user(p, bits, len) ? -EFAULT : len; } #endif /* CONFIG_COMPAT */ static int str_to_user(const char *str, unsigned int maxlen, void __user *p) { int len; if (!str) return -ENOENT; len = strlen(str) + 1; if (len > maxlen) len = maxlen; return copy_to_user(p, str, len) ? -EFAULT : len; } static long evdev_ioctl_handler(struct file *file, unsigned int cmd, void __user *p, int compat_mode) { struct evdev_list *list = file->private_data; struct evdev *evdev = list->evdev; struct input_dev *dev = evdev->handle.dev; struct input_absinfo abs; int __user *ip = (int __user *)p; int i, t, u, v; if (!evdev->exist) return -ENODEV; switch (cmd) { case EVIOCGVERSION: return put_user(EV_VERSION, ip); case EVIOCGID: if (copy_to_user(p, &dev->id, sizeof(struct input_id))) return -EFAULT; return 0; case EVIOCGKEYCODE: if (get_user(t, ip)) return -EFAULT; if (t < 0 || t >= dev->keycodemax || !dev->keycodesize) return -EINVAL; if (put_user(INPUT_KEYCODE(dev, t), ip + 1)) return -EFAULT; return 0; case EVIOCSKEYCODE: if (get_user(t, ip)) return -EFAULT; if (t < 0 || t >= dev->keycodemax || !dev->keycodesize) return -EINVAL; if (get_user(v, ip + 1)) return -EFAULT; if (v < 0 || v > KEY_MAX) return -EINVAL; if (dev->keycodesize < sizeof(v) && (v >> (dev->keycodesize * 8))) return -EINVAL; u = SET_INPUT_KEYCODE(dev, t, v); clear_bit(u, dev->keybit); set_bit(v, dev->keybit); for (i = 0; i < dev->keycodemax; i++) if (INPUT_KEYCODE(dev, i) == u) set_bit(u, dev->keybit); return 0; case EVIOCSFF: if (dev->upload_effect) { struct ff_effect effect; int err; if (copy_from_user(&effect, p, sizeof(effect))) return -EFAULT; err = dev->upload_effect(dev, &effect); if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) return -EFAULT; return err; } else return -ENOSYS; case EVIOCRMFF: if (!dev->erase_effect) return -ENOSYS; return dev->erase_effect(dev, (int)(unsigned long) p); case EVIOCGEFFECTS: if (put_user(dev->ff_effects_max, ip)) return -EFAULT; return 0; case EVIOCGRAB: if (p) { if (evdev->grab) return -EBUSY; if (input_grab_device(&evdev->handle)) return -EBUSY; evdev->grab = list; return 0; } else { if (evdev->grab != list) return -EINVAL; input_release_device(&evdev->handle); evdev->grab = NULL; return 0; } default: if (_IOC_TYPE(cmd) != 'E') return -EINVAL; if (_IOC_DIR(cmd) == _IOC_READ) { if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) { long *bits; int len; switch (_IOC_NR(cmd) & EV_MAX) { case 0: bits = dev->evbit; len = EV_MAX; break; case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; case EV_REL: bits = dev->relbit; len = REL_MAX; break; case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; case EV_LED: bits = dev->ledbit; len = LED_MAX; break; case EV_SND: bits = dev->sndbit; len = SND_MAX; break; case EV_FF: bits = dev->ffbit; len = FF_MAX; break;