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input_alloc_absinfo(9) [centos man page]

INPUT_ALLOC_ABSINFO(9)						  Input Subsystem					    INPUT_ALLOC_ABSINFO(9)

NAME
input_alloc_absinfo - allocates array of input_absinfo structs SYNOPSIS
void input_alloc_absinfo(struct input_dev * dev); ARGUMENTS
dev the input device emitting absolute events DESCRIPTION
If the absinfo struct the caller asked for is already allocated, this functions will not do anything. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 INPUT_ALLOC_ABSINFO(9)

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STRUCT 
INPUT_DEV(9) Input Subsystem STRUCT INPUT_DEV(9) NAME
struct_input_dev - represents an input device SYNOPSIS
struct input_dev { const char * name; const char * phys; const char * uniq; struct input_id id; unsigned long propbit[BITS_TO_LONGS(INPUT_PROP_CNT)]; unsigned long evbit[BITS_TO_LONGS(EV_CNT)]; unsigned long keybit[BITS_TO_LONGS(KEY_CNT)]; unsigned long relbit[BITS_TO_LONGS(REL_CNT)]; unsigned long absbit[BITS_TO_LONGS(ABS_CNT)]; unsigned long mscbit[BITS_TO_LONGS(MSC_CNT)]; unsigned long ledbit[BITS_TO_LONGS(LED_CNT)]; unsigned long sndbit[BITS_TO_LONGS(SND_CNT)]; unsigned long ffbit[BITS_TO_LONGS(FF_CNT)]; unsigned long swbit[BITS_TO_LONGS(SW_CNT)]; unsigned int hint_events_per_packet; unsigned int keycodemax; unsigned int keycodesize; void * keycode; int (* setkeycode) (struct input_dev *dev,const struct input_keymap_entry *ke,unsigned int *old_keycode); int (* getkeycode) (struct input_dev *dev,struct input_keymap_entry *ke); struct ff_device * ff; unsigned int repeat_key; struct timer_list timer; int rep[REP_CNT]; struct input_mt * mt; struct input_absinfo * absinfo; unsigned long key[BITS_TO_LONGS(KEY_CNT)]; unsigned long led[BITS_TO_LONGS(LED_CNT)]; unsigned long snd[BITS_TO_LONGS(SND_CNT)]; unsigned long sw[BITS_TO_LONGS(SW_CNT)]; int (* open) (struct input_dev *dev); void (* close) (struct input_dev *dev); int (* flush) (struct input_dev *dev, struct file *file); int (* event) (struct input_dev *dev, unsigned int type, unsigned int code, int value); struct input_handle __rcu * grab; spinlock_t event_lock; struct mutex mutex; unsigned int users; bool going_away; struct device dev; struct list_head h_list; struct list_head node; unsigned int num_vals; unsigned int max_vals; struct input_value * vals; bool devres_managed; }; MEMBERS
name name of the device phys physical path to the device in the system hierarchy uniq unique identification code for the device (if device has it) id id of the device (struct input_id) propbit[BITS_TO_LONGS(INPUT_PROP_CNT)] bitmap of device properties and quirks evbit[BITS_TO_LONGS(EV_CNT)] bitmap of types of events supported by the device (EV_KEY, EV_REL, etc.) keybit[BITS_TO_LONGS(KEY_CNT)] bitmap of keys/buttons this device has relbit[BITS_TO_LONGS(REL_CNT)] bitmap of relative axes for the device absbit[BITS_TO_LONGS(ABS_CNT)] bitmap of absolute axes for the device mscbit[BITS_TO_LONGS(MSC_CNT)] bitmap of miscellaneous events supported by the device ledbit[BITS_TO_LONGS(LED_CNT)] bitmap of leds present on the device sndbit[BITS_TO_LONGS(SND_CNT)] bitmap of sound effects supported by the device ffbit[BITS_TO_LONGS(FF_CNT)] bitmap of force feedback effects supported by the device swbit[BITS_TO_LONGS(SW_CNT)] bitmap of switches present on the device hint_events_per_packet average number of events generated by the device in a packet (between EV_SYN/SYN_REPORT events). Used by event handlers to estimate size of the buffer needed to hold events. keycodemax size of keycode table keycodesize size of elements in keycode table keycode map of scancodes to keycodes for this device setkeycode optional method to alter current keymap, used to implement sparse keymaps. If not supplied default mechanism will be used. The method is being called while holding event_lock and thus must not sleep getkeycode optional legacy method to retrieve current keymap. ff force feedback structure associated with the device if device supports force feedback effects repeat_key stores key code of the last key pressed; used to implement software autorepeat timer timer for software autorepeat rep[REP_CNT] current values for autorepeat parameters (delay, rate) mt pointer to multitouch state absinfo array of struct input_absinfo elements holding information about absolute axes (current value, min, max, flat, fuzz, resolution) key[BITS_TO_LONGS(KEY_CNT)] reflects current state of device's keys/buttons led[BITS_TO_LONGS(LED_CNT)] reflects current state of device's LEDs snd[BITS_TO_LONGS(SND_CNT)] reflects current state of sound effects sw[BITS_TO_LONGS(SW_CNT)] reflects current state of device's switches open this method is called when the very first user calls input_open_device. The driver must prepare the device to start generating events (start polling thread, request an IRQ, submit URB, etc.) close this method is called when the very last user calls input_close_device. flush purges the device. Most commonly used to get rid of force feedback effects loaded into the device when disconnecting from it event event handler for events sent _to_ the device, like EV_LED or EV_SND. The device is expected to carry out the requested action (turn on a LED, play sound, etc.) The call is protected by event_lock and must not sleep grab input handle that currently has the device grabbed (via EVIOCGRAB ioctl). When a handle grabs a device it becomes sole recipient for all input events coming from the device event_lock this spinlock is is taken when input core receives and processes a new event for the device (in input_event). Code that accesses and/or modifies parameters of a device (such as keymap or absmin, absmax, absfuzz, etc.) after device has been registered with input core must take this lock. mutex serializes calls to open, close and flush methods users stores number of users (input handlers) that opened this device. It is used by input_open_device and input_close_device to make sure that dev->open is only called when the first user opens device and dev->close is called when the very last user closes the device going_away marks devices that are in a middle of unregistering and causes input_open_device*() fail with -ENODEV. dev driver model's view of this device h_list list of input handles associated with the device. When accessing the list dev->mutex must be held node used to place the device onto input_dev_list num_vals number of values queued in the current frame max_vals maximum number of values queued in a frame vals array of values queued in the current frame devres_managed indicates that devices is managed with devres framework and needs not be explicitly unregistered or freed. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 STRUCT INPUT_DEV(9)

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