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75543cce0c
Move non-V4L specific stuff from ir-functions ir_input_init() into a new function to register ir devices: ir_input_register(). Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
478 lines
13 KiB
C
478 lines
13 KiB
C
/* ir-register.c - handle IR scancode->keycode tables
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*
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* Copyright (C) 2009 by Mauro Carvalho Chehab <mchehab@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/usb/input.h>
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#include <media/ir-common.h>
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#define IR_TAB_MIN_SIZE 32
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#define IR_TAB_MAX_SIZE 1024
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/**
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* ir_seek_table() - returns the element order on the table
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* @rc_tab: the ir_scancode_table with the keymap to be used
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* @scancode: the scancode that we're seeking
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*
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* This routine is used by the input routines when a key is pressed at the
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* IR. The scancode is received and needs to be converted into a keycode.
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* If the key is not found, it returns KEY_UNKNOWN. Otherwise, returns the
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* corresponding keycode from the table.
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*/
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static int ir_seek_table(struct ir_scancode_table *rc_tab, u32 scancode)
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{
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int rc;
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unsigned long flags;
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struct ir_scancode *keymap = rc_tab->scan;
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spin_lock_irqsave(&rc_tab->lock, flags);
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/* FIXME: replace it by a binary search */
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for (rc = 0; rc < rc_tab->size; rc++)
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if (keymap[rc].scancode == scancode)
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goto exit;
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/* Not found */
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rc = -EINVAL;
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exit:
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spin_unlock_irqrestore(&rc_tab->lock, flags);
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return rc;
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}
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/**
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* ir_roundup_tablesize() - gets an optimum value for the table size
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* @n_elems: minimum number of entries to store keycodes
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*
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* This routine is used to choose the keycode table size.
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*
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* In order to have some empty space for new keycodes,
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* and knowing in advance that kmalloc allocates only power of two
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* segments, it optimizes the allocated space to have some spare space
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* for those new keycodes by using the maximum number of entries that
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* will be effectively be allocated by kmalloc.
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* In order to reduce the quantity of table resizes, it has a minimum
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* table size of IR_TAB_MIN_SIZE.
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*/
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int ir_roundup_tablesize(int n_elems)
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{
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size_t size;
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if (n_elems < IR_TAB_MIN_SIZE)
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n_elems = IR_TAB_MIN_SIZE;
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/*
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* As kmalloc only allocates sizes of power of two, get as
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* much entries as possible for the allocated memory segment
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*/
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size = roundup_pow_of_two(n_elems * sizeof(struct ir_scancode));
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n_elems = size / sizeof(struct ir_scancode);
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return n_elems;
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}
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EXPORT_SYMBOL_GPL(ir_roundup_tablesize);
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/**
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* ir_copy_table() - copies a keytable, discarding the unused entries
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* @destin: destin table
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* @origin: origin table
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*
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* Copies all entries where the keycode is not KEY_UNKNOWN/KEY_RESERVED
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*/
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int ir_copy_table(struct ir_scancode_table *destin,
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const struct ir_scancode_table *origin)
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{
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int i, j = 0;
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for (i = 0; i < origin->size; i++) {
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if (origin->scan[i].keycode == KEY_UNKNOWN ||
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origin->scan[i].keycode == KEY_RESERVED)
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continue;
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memcpy(&destin->scan[j], &origin->scan[i], sizeof(struct ir_scancode));
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j++;
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}
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destin->size = j;
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IR_dprintk(1, "Copied %d scancodes to the new keycode table\n", destin->size);
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return 0;
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}
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EXPORT_SYMBOL_GPL(ir_copy_table);
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/**
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* ir_getkeycode() - get a keycode at the evdev scancode ->keycode table
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* @dev: the struct input_dev device descriptor
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* @scancode: the desired scancode
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* @keycode: the keycode to be retorned.
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*
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* This routine is used to handle evdev EVIOCGKEY ioctl.
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* If the key is not found, returns -EINVAL, otherwise, returns 0.
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*/
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static int ir_getkeycode(struct input_dev *dev,
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int scancode, int *keycode)
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{
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int elem;
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struct ir_input_dev *ir_dev = input_get_drvdata(dev);
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struct ir_scancode_table *rc_tab = &ir_dev->rc_tab;
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elem = ir_seek_table(rc_tab, scancode);
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if (elem >= 0) {
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*keycode = rc_tab->scan[elem].keycode;
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return 0;
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}
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/*
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* Scancode not found and table can't be expanded
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*/
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if (elem < 0 && rc_tab->size == IR_TAB_MAX_SIZE)
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return -EINVAL;
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/*
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* If is there extra space, returns KEY_RESERVED,
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* otherwise, input core won't let ir_setkeycode to work
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*/
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*keycode = KEY_RESERVED;
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return 0;
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}
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/**
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* ir_is_resize_needed() - Check if the table needs rezise
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* @table: keycode table that may need to resize
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* @n_elems: minimum number of entries to store keycodes
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*
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* Considering that kmalloc uses power of two storage areas, this
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* routine detects if the real alloced size will change. If not, it
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* just returns without doing nothing. Otherwise, it will extend or
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* reduce the table size to meet the new needs.
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*
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* It returns 0 if no resize is needed, 1 otherwise.
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*/
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static int ir_is_resize_needed(struct ir_scancode_table *table, int n_elems)
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{
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int cur_size = ir_roundup_tablesize(table->size);
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int new_size = ir_roundup_tablesize(n_elems);
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if (cur_size == new_size)
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return 0;
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/* Resize is needed */
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return 1;
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}
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/**
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* ir_delete_key() - remove a keycode from the table
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* @rc_tab: keycode table
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* @elem: element to be removed
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*
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*/
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static void ir_delete_key(struct ir_scancode_table *rc_tab, int elem)
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{
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unsigned long flags = 0;
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int newsize = rc_tab->size - 1;
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int resize = ir_is_resize_needed(rc_tab, newsize);
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struct ir_scancode *oldkeymap = rc_tab->scan;
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struct ir_scancode *newkeymap;
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if (resize) {
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newkeymap = kzalloc(ir_roundup_tablesize(newsize) *
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sizeof(*newkeymap), GFP_ATOMIC);
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/* There's no memory for resize. Keep the old table */
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if (!newkeymap)
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resize = 0;
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}
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if (!resize) {
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newkeymap = oldkeymap;
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/* We'll modify the live table. Lock it */
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spin_lock_irqsave(&rc_tab->lock, flags);
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}
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/*
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* Copy the elements before the one that will be deleted
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* if (!resize), both oldkeymap and newkeymap points
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* to the same place, so, there's no need to copy
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*/
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if (resize && elem > 0)
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memcpy(newkeymap, oldkeymap,
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elem * sizeof(*newkeymap));
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/*
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* Copy the other elements overwriting the element to be removed
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* This operation applies to both resize and non-resize case
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*/
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if (elem < newsize)
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memcpy(&newkeymap[elem], &oldkeymap[elem + 1],
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(newsize - elem) * sizeof(*newkeymap));
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if (resize) {
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/*
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* As the copy happened to a temporary table, only here
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* it needs to lock while replacing the table pointers
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* to use the new table
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*/
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spin_lock_irqsave(&rc_tab->lock, flags);
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rc_tab->size = newsize;
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rc_tab->scan = newkeymap;
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spin_unlock_irqrestore(&rc_tab->lock, flags);
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/* Frees the old keytable */
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kfree(oldkeymap);
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} else {
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rc_tab->size = newsize;
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spin_unlock_irqrestore(&rc_tab->lock, flags);
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}
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}
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/**
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* ir_insert_key() - insert a keycode at the table
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* @rc_tab: keycode table
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* @scancode: the desired scancode
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* @keycode: the keycode to be retorned.
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*
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*/
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static int ir_insert_key(struct ir_scancode_table *rc_tab,
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int scancode, int keycode)
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{
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unsigned long flags;
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int elem = rc_tab->size;
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int newsize = rc_tab->size + 1;
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int resize = ir_is_resize_needed(rc_tab, newsize);
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struct ir_scancode *oldkeymap = rc_tab->scan;
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struct ir_scancode *newkeymap;
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if (resize) {
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newkeymap = kzalloc(ir_roundup_tablesize(newsize) *
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sizeof(*newkeymap), GFP_ATOMIC);
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if (!newkeymap)
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return -ENOMEM;
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memcpy(newkeymap, oldkeymap,
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rc_tab->size * sizeof(*newkeymap));
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} else
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newkeymap = oldkeymap;
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/* Stores the new code at the table */
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IR_dprintk(1, "#%d: New scan 0x%04x with key 0x%04x\n",
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rc_tab->size, scancode, keycode);
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spin_lock_irqsave(&rc_tab->lock, flags);
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rc_tab->size = newsize;
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if (resize) {
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rc_tab->scan = newkeymap;
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kfree(oldkeymap);
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}
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newkeymap[elem].scancode = scancode;
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newkeymap[elem].keycode = keycode;
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spin_unlock_irqrestore(&rc_tab->lock, flags);
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return 0;
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}
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/**
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* ir_setkeycode() - set a keycode at the evdev scancode ->keycode table
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* @dev: the struct input_dev device descriptor
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* @scancode: the desired scancode
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* @keycode: the keycode to be retorned.
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*
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* This routine is used to handle evdev EVIOCSKEY ioctl.
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* There's one caveat here: how can we increase the size of the table?
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* If the key is not found, returns -EINVAL, otherwise, returns 0.
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*/
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static int ir_setkeycode(struct input_dev *dev,
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int scancode, int keycode)
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{
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int rc = 0;
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struct ir_input_dev *ir_dev = input_get_drvdata(dev);
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struct ir_scancode_table *rc_tab = &ir_dev->rc_tab;
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struct ir_scancode *keymap = rc_tab->scan;
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unsigned long flags;
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/*
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* Handle keycode table deletions
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*
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* If userspace is adding a KEY_UNKNOWN or KEY_RESERVED,
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* deal as a trial to remove an existing scancode attribution
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* if table become too big, reduce it to save space
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*/
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if (keycode == KEY_UNKNOWN || keycode == KEY_RESERVED) {
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rc = ir_seek_table(rc_tab, scancode);
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if (rc < 0)
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return 0;
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IR_dprintk(1, "#%d: Deleting scan 0x%04x\n", rc, scancode);
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clear_bit(keymap[rc].keycode, dev->keybit);
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ir_delete_key(rc_tab, rc);
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return 0;
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}
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/*
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* Handle keycode replacements
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*
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* If the scancode exists, just replace by the new value
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*/
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rc = ir_seek_table(rc_tab, scancode);
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if (rc >= 0) {
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IR_dprintk(1, "#%d: Replacing scan 0x%04x with key 0x%04x\n",
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rc, scancode, keycode);
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clear_bit(keymap[rc].keycode, dev->keybit);
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spin_lock_irqsave(&rc_tab->lock, flags);
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keymap[rc].keycode = keycode;
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spin_unlock_irqrestore(&rc_tab->lock, flags);
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set_bit(keycode, dev->keybit);
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return 0;
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}
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/*
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* Handle new scancode inserts
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*
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* reallocate table if needed and insert a new keycode
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*/
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/* Avoid growing the table indefinitely */
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if (rc_tab->size + 1 > IR_TAB_MAX_SIZE)
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return -EINVAL;
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rc = ir_insert_key(rc_tab, scancode, keycode);
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if (rc < 0)
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return rc;
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set_bit(keycode, dev->keybit);
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return 0;
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}
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/**
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* ir_g_keycode_from_table() - gets the keycode that corresponds to a scancode
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* @input_dev: the struct input_dev descriptor of the device
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* @scancode: the scancode that we're seeking
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*
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* This routine is used by the input routines when a key is pressed at the
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* IR. The scancode is received and needs to be converted into a keycode.
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* If the key is not found, it returns KEY_UNKNOWN. Otherwise, returns the
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* corresponding keycode from the table.
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*/
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u32 ir_g_keycode_from_table(struct input_dev *dev, u32 scancode)
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{
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struct ir_input_dev *ir_dev = input_get_drvdata(dev);
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struct ir_scancode_table *rc_tab = &ir_dev->rc_tab;
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struct ir_scancode *keymap = rc_tab->scan;
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int elem;
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elem = ir_seek_table(rc_tab, scancode);
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if (elem >= 0) {
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IR_dprintk(1, "%s: scancode 0x%04x keycode 0x%02x\n",
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dev->name, scancode, keymap[elem].keycode);
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return rc_tab->scan[elem].keycode;
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}
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printk(KERN_INFO "%s: unknown key for scancode 0x%04x\n",
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dev->name, scancode);
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/* Reports userspace that an unknown keycode were got */
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return KEY_RESERVED;
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}
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EXPORT_SYMBOL_GPL(ir_g_keycode_from_table);
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/**
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* ir_input_register() - sets the IR keycode table and add the handlers
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* for keymap table get/set
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* @input_dev: the struct input_dev descriptor of the device
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* @rc_tab: the struct ir_scancode_table table of scancode/keymap
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*
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* This routine is used to initialize the input infrastructure to work with
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* an IR.
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* It should be called before registering the IR device.
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*/
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int ir_input_register(struct input_dev *input_dev,
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struct ir_scancode_table *rc_tab)
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{
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struct ir_input_dev *ir_dev;
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struct ir_scancode *keymap = rc_tab->scan;
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int i;
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if (rc_tab->scan == NULL || !rc_tab->size)
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return -EINVAL;
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ir_dev = kzalloc(sizeof(*ir_dev), GFP_KERNEL);
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if (!ir_dev)
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return -ENOMEM;
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spin_lock_init(&rc_tab->lock);
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ir_dev->rc_tab.size = ir_roundup_tablesize(rc_tab->size);
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ir_dev->rc_tab.scan = kzalloc(ir_dev->rc_tab.size *
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sizeof(struct ir_scancode), GFP_KERNEL);
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if (!ir_dev->rc_tab.scan)
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return -ENOMEM;
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IR_dprintk(1, "Allocated space for %d keycode entries (%zd bytes)\n",
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ir_dev->rc_tab.size,
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ir_dev->rc_tab.size * sizeof(ir_dev->rc_tab.scan));
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ir_copy_table(&ir_dev->rc_tab, rc_tab);
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/* set the bits for the keys */
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IR_dprintk(1, "key map size: %d\n", rc_tab->size);
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for (i = 0; i < rc_tab->size; i++) {
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IR_dprintk(1, "#%d: setting bit for keycode 0x%04x\n",
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i, keymap[i].keycode);
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set_bit(keymap[i].keycode, input_dev->keybit);
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}
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clear_bit(0, input_dev->keybit);
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set_bit(EV_KEY, input_dev->evbit);
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input_dev->getkeycode = ir_getkeycode;
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input_dev->setkeycode = ir_setkeycode;
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input_set_drvdata(input_dev, ir_dev);
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return 0;
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}
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EXPORT_SYMBOL_GPL(ir_input_register);
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void ir_input_free(struct input_dev *dev)
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{
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struct ir_input_dev *ir_dev = input_get_drvdata(dev);
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struct ir_scancode_table *rc_tab = &ir_dev->rc_tab;
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if (!rc_tab)
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return;
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IR_dprintk(1, "Freed keycode table\n");
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rc_tab->size = 0;
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kfree(rc_tab->scan);
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rc_tab->scan = NULL;
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kfree(ir_dev);
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input_set_drvdata(dev, NULL);
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}
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EXPORT_SYMBOL_GPL(ir_input_free);
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int ir_core_debug; /* ir_debug level (0,1,2) */
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EXPORT_SYMBOL_GPL(ir_core_debug);
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module_param_named(debug, ir_core_debug, int, 0644);
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MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
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MODULE_LICENSE("GPL");
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